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    • 专利摘要:
    Water injection air compressor comprising a compressor main body for compressing air, a water supply line for introducing water into an activation chamber in the compressor main body, a valve air release valve for releasing compressed air from the main body of the compressor, and a control panel for performing a loaded operating mode in which water is introduced into the activation chamber and in which an air release valve is closed and an off-load mode of operation in which water is introduced into the activation chamber and in which the air release valve is open, characterized in that the control panel also performs a dry operating mode in which water is prevented from supplying the activation chamber and in which the air release valve is opened.
    公开号:BE1019636A3
    申请号:E2010/0085
    申请日:2010-02-17
    公开日:2012-09-04
    发明作者:Takehiro Matsuzaka
    申请人:Hitachi Ind Equipement Systems Co Ltd；
    IPC主号:
    专利说明:

    WATER INJECTION TYPE AIR COMPRESSOR
    BACKGROUND OF THE INVENTION
    The present invention relates to a water injection air compressor configured to introduce water into an activation chamber located in the main body of the compressor.
    Conventional water injection air compressors have previously been described which allow to increase the compression efficiency by bringing the water into the activation chamber located in the main body of the compressor, without the need for to mix oil with compressed air (see, for example, JP-A-2008-95643).
    BRIEF SUMMARY OF THE INVENTION
    In the water injection air compressor, even when the compressor main body is stopped in order to interrupt the water supply to the activation chamber, the water can remain in the activation chamber located in the main body of the compressor or moisture present in the activation chamber may increase. Thus, the metal components present inside the activation chamber can be attacked by corrosion.
    Generally, known methods that prevent metal components from being attacked by corrosion involve the use of a corrosion resistant material such as stainless steel or a copper alloy or involve subjecting the components to corrosion. to a surface treatment such as plating or coating. However, despite these measures to fight against corrosion, corrosion factors are present. This is the case, for example, with regard to the quality of the water, if the water contains chloride ions, the stainless metal can be attacked by corrosion. If the water contains ammonia, the copper may be attacked by corrosion. In addition, the following is also possible: the corrosion of the joints, which is likely to appear in the spaces between the components, and the galvanic corrosion, which is likely to appear between the different types of metals. In addition, defects (blisters) may occur during surface treatment such as plating or coating. Even in this case, corrosion appears.
    An object of the present invention is to provide a water injection air compressor configured to prevent the interior of the compressor main body from being attacked by corrosion.
    (1) In order to accomplish this objective, the present invention provides a water injection air compressor comprising a compressor main body configured to compress the air, a configured water supply line of to be able to supply water to an activation chamber located in the main body of the compressor, an air release valve configured to be able to release the compressed air ejected from the main body of the compressor, and a control device for carrying out a load procedure in which the main body of the compressor is allowed to perform the load procedure while the water is introduced into the activation chamber located in the main body of the compressor and the air release valve is closed and perform the off-load procedure during which the main body of the compressor is allowed to perform the operating mode e off-load while the water is introduced into the activation chamber located in the main body of the compressor and the air release valve is open, characterized in that the control device performs a procedure to dry during which the main body of the compressor is allowed to perform the out-of-charge procedure while the water is introduced into the activation chamber located in the main body of the stopped compressor and that the air release valve is open.
    (2) In step (1), preferably, the controller executes the dry mode before the compressor is stopped in accordance with a stop instruction.
    (3) In step (2), preferably, the water injection air compressor also comprises a pressure sensing device for detecting an ejection pressure of the main body of the compressor, and in accordance with at the stopping instruction, the controller determines whether the ejection pressure detected by the pressure sensing device is equal to or less than or less than a predetermined threshold, and whether the ejection pressure exceeds the predetermined threshold, the controller executes the out-of-charge mode, and after the ejection pressure has become equal to or less than the predetermined threshold, it executes the dry mode, and then stops the compressor.
    (4) In step (2), preferably, the water injection air compressor also comprises a temperature sensing device for detecting an ejection temperature of the main body of the compressor, and in accordance with at a stop instruction, the control device determines whether or not the ejection temperature detected by the temperature detection device is equal to or less than a predetermined threshold, and whether the ejection temperature exceeds the predetermined threshold, the controller executes the out-of-charge mode, and after the ejection temperature has become equal to or less than the predetermined threshold, it executes the dry mode, and then stops the compressor.
    (5) In any one of the steps (1) to (4), preferably, the controller executes the dry mode in response to the flow of each predetermined period of time, during which time which activation of the activation chamber is prevented.
    (6) In any one of the steps (1) to (4), preferably, the controller executes the dry mode at a predefined time during the compressor off time.
    (7) In any one of the steps (1) to (6), preferably, the controller executes the dry mode according to an instruction given by an operator via an operating device while the compressor is stopped.
    (8) In any one of the steps (1) to (7), preferably, the controller switches to the dry mode when the duration of the off-load operating mode reaches a first predetermined time, and stops the main body of the compressor when the duration of the dry mode reaches a second predetermined duration.
    (9) In step (8), preferably, the water injection air compressor also comprises a pressure sensing device for detecting the ejection pressure of the main body of the compressor, and when the duration of the out-of-charge procedure reaches a first predetermined time and the ejection pressure detected by the pressure sensing device is equal to or less than a predetermined threshold, the controller switches to the operating mode at dry.
    (10) In step (9), preferably, the controller switches to the out-of-charge mode if the ejection pressure detected by the pressure sensing device exceeds the predetermined threshold during the operating mode. dried up.
    (11) In step (8), preferably, the water-injected air compressor also comprises a temperature sensing device for detecting the ejection temperature of the compressor main body, and when the duration of the out-of-charge operating mode reaches the first predetermined time and the ejection temperature detected by the temperature sensing device is equal to or less than a predetermined threshold, the control device switches to the dry operating mode .
    (12) Preferably, in step (11), the controller switches to the out-of-charge mode if the ejection temperature detected by the temperature sensing device exceeds the predetermined threshold during the mode of operation. dry operation.
    (, 13) In any one of the steps (1) to (12), preferably, the control device executes the dry mode each time that a stopping time of the main body of the compressor reaches a third predetermined duration.
    The present invention can prevent the interior of the compressor main body from being attacked by corrosion.
    Other objects, features and advantages of the invention will become more apparent upon reading the following description of embodiments of the invention taken into consideration with the accompanying drawings.
    BRIEF DESCRIPTION OF THE VARIOUS VIEWS OF THE DRAWINGS
    Fig. 1 is a diagram illustrating the configuration of a water injection air compressor according to a first embodiment of the present invention;
    Fig. 2 is a block diagram illustrating the functional configuration of a control panel according to the first embodiment of the present invention together with the devices associated therewith;
    Fig. 3 is a motion graph illustrating the control steps performed by an arithmetic device in the control panel according to the first embodiment of the present invention;
    Fig. 4 is a time chart illustrating an operation according to the first embodiment of the present invention;
    Fig. 5 is a characteristic diagram illustrating a rate of pressure and a temperature of the ejected air;
    Fig. 6 is a block diagram illustrating the functional configuration of the control panel according to a first modification of the present invention together with the devices therein associated therewith;
    Fig. 7 is a motion graph illustrating the control steps performed by the arithmetic device in the control panel according to a second embodiment of the present invention;
    Fig. 8 is a time chart illustrating an operation according to the second embodiment of the present invention;
    Fig. 9 is a motion graph illustrating the control steps performed by the arithmetic device in the control panel according to a third embodiment of the present invention;
    Fig. 10 is a time chart illustrating an operation according to the third embodiment of the present invention;
    Fig. 11 is a diagram illustrating the configuration of a water injection air compressor according to a second modification of the present invention; ,
    Fig. 12 is a time chart illustrating an operation in accordance with the second modification of the present invention;
    Fig. 13 is a time chart illustrating another example of operation in accordance with the second modification of the present invention; and
    Fig. 14 is a diagram illustrating the configuration of a water injection air compressor according to a third modification of the present invention.
    DETAILED DESCRIPTION OF THE INVENTION
    A first embodiment of the present invention will be described with reference to the drawings.
    Fig. 1 is a diagram illustrating the configuration of a water injection air compressor according to the present embodiment.
    In FIG. 1, a water injection air compressor • (• compression unit) - comprises a main body of the compressor 1, a motor configured to drive the main body of the compressor 1, and a control panel 3 configured in order to control the entire compressor including the motor 2. The main body of the compressor .1 comprises a pair of male and female screw rotors 4A and 4B which are supported in their rotation by a support (not shown in the drawings; for example, a support of the type lubricated with oil). When the rotational power of the motor 2 is transmitted to the screw rotor 4A, synchronizing gears 5A and 5B. allow the screw rotors 4A and 4B to rotate, respectively, in a movement that allows them to not come into contact with each other. Thus, an activation chamber formed between the grooves of the teeth of the screw rotors 4A and 4B moves to allow air that is drawn into the activation chamber to be compressed and ejected. .
    A suction control valve 6 and a suction filter 7 are provided on the suction side of the main body of the compressor 1. In addition, a separation tank 9 is connected to a discharge side of the body The separation tank 9 separates the compressed air that is ejected from the main body of the compressor 1, the water that is contained in the compressed air.
    The water separated by the separation tank 9 is temporarily stored in the lower portion of the separation tank 9. The water is then guided to a water cooler by circulating air 11 via a pipe d water 10 by means of a discharge pressure from the main body of the compressor 1. The water is then cooled by a cooling wind, generated by a fan 12. A water filter 13 is then used to removing the impurities from the water cooled by the water cooler 11. The resulting water is injected into the activation chamber located in the main body of the compressor 1. A water supply valve 14 is provided downstream. water filter 13.
    In addition, filling pipes 15 and 16 are provided and are configured to bring water from the outside at the suction side of the separation tank 9 and the main body of the compressor 1 if, for example the amount of water stored in the separation tank 9 decreases. A three-way electrical valve 17 is provided at an intersection between the fill pipes 15 and 16. In addition, a flow pipe 18 is provided to discharge the water stored in the separation tank. An electric drain cock 19 and a manual drain valve 20 are provided in the drain pipe 18.
    The compressed air resulting from the separation in the separation tank 9 is guided to a secondary cooler via a compressed air hose. 21. The compressed air is then cooled by a cooling wind generated by a fan 12. The compressed air cooled by the secondary cooler 22 is guided to a dryer 23, in which the compressed air is dehumidified. The dehumidified air is then supplied to a user. In addition, a non-return valve 24 and a regulating valve 25 are provided upstream of the secondary cooler 22 in the compressed air pipe 21 (in other words, on a secondary side of the separation tank 9). An air release pipe 26A is also provided which extends upstream of the non-return valve 24 in the compressed air pipe 21. An air release valve 27A configured to be able to release the compressed air is provided in the air release pipe 26A. The air release valve 27A and the suction control valve 6 are nested one inside the other. If the air release valve 27A is open, the adjustment valve, suction 6 is open. If the air release valve 27A is open, the suction control valve 6 is closed.
    In addition, an ejection pressure sensor 28 is provided in the ejection pipe 8 so as to detect the ejection pressure of the main body of the compressor 1. A supply pressure detector 29 is provided downstream. of the dryer 23 in the compressed air pipe 21 so as to detect a supply pressure. The control panel 3 is configured to receive the detection signals from the ejection pressure detector 28 and the supply pressure detector 29 and to switch to an operating mode based on the detection signals.
    Fig. 2 is a block diagram illustrating the functional configuration of the control panel 3 relating to the control of the switching of the operating mode in conjunction with the devices associated therewith.
    In FIG. 2, the control panel 3 comprises a storage device 30, an arithmetic device 31,. a timer 32, and an inverter 33. The arithmetic device 31 is configured to receive a start instruction (or a stop instruction) so as to initiate (or stop) an operation of the compression unit if for example, an operator actuates a start-up button (or a stop button) on a control panel 34.
    While the compression unit is in action, the arithmetic device 31 receives a detection signal from the supply pressure detector 29 and executes a load mode, an out-of-charge mode, or a mode of operation. stop according to the detection signal. As a control range of a supply pressure Pd1, for example, a target pressure PM = 0.79 MPa (abs), the maximum pressure PH = 0.88 MPa (abs), and the minimum pressure PL = 0.70 MPa (abs), are determined and stored in the storage device 30 .. These fixed values are control references and can be determined by inputs via the control panel 34. In the load mode, the arithmetic device 31 opens the water supply valve 14 so as to introduce water into the activation chamber located in the main body of the compressor 1. In addition, the arithmetic device 31 closes the air release valve 27A (as a result of this closing, the suction control valve 6 is open), while driving the motor 2 so as to allow the main body of the compressor 1 to perform the load mode. At this time, the arithmetic device 31 performs a PID operation based on the deviation between the supply pressure Pd1 detected by the supply pressure detector 29 and the target pressure PM. Then, based on the value obtained, the number of rotations of the engine 2 is controlled variably by the inverter 33. Therefore, the supply pressure Pdl becomes almost equal to the target pressure PM.
    However, a significant increase in the amount of compressed air used by the user causes an increase in the supply pressure Pdl even if the number of rotations of the engine 2 is reduced to a minimum value. When the supply pressure
    Pdl reaches the maximum pressure PH, the arithmetic device switches to the out-of-charge mode. In the out-of-charge mode of operation, as is the case during the load operation, the arithmetic device 31 opens the water supply valve 14 to bring the water into the activation chamber. located in the main body of the compressor 1. In addition, the. arithmetic device 31 opens the air release valve 27A (as a result of this opening, the suction control valve 6 is closed), while reducing the number of rotations of the motor 2 to its minimum value so as to allow the main body of the compressor 1 to perform an out-of-charge procedure.
    The arithmetic device 31 then determines whether or not the supply pressure Pdl falls below the minimum pressure PL or less during the out-of-charge procedure. For example, if the supply pressure Pdl drops to the level of the. Minimum pressure PL, the arithmetic device 31 switches to the operating mode under load. On the other hand, for example, if the supply pressure Pd1 does not drop to the level of the minimum pressure PL, the arithmetic device 31 continues the out-of-charge operating mode. The arithmetic device 31 uses a timer 32 so as to calculate the time during which the out-of-charge procedure is continued. Then, the duration of the out-of-charge procedure reaches a predetermined duration, the arithmetic device 31 switches to the stop mode. During the stop mode, the arithmetic device 31 closes the water supply valve 14 so as to stop 1-water supply at the activation chamber located in the main body of the compressor 1. The arithmetic device 31 also stops the motor 2 and therefore, the main body, of the compressor 1. In addition, during the stop mode, if the supply pressure Pdl drops to the level of the minimum pressure PL, the arithmetic device 31 switches to the load mode.
    In the present case, the main feature of this exemplary embodiment is that the arithmetic device 31 executes the dry mode before the compression unit is stopped in accordance with a shutdown instruction from the control panel 34. In the dry mode, the arithmetic device 31 closes the water supply valve 14 so as to stop the water supply at the activation chamber located in the. In addition, as is the case with the non-load operating mode, the arithmetic device 31 opens the air release valve 27A (as a result of this opening the the suction 6 is closed), while reducing the number of rotations of the engine 2 to its minimum value so as to allow the main body of the compressor 1 to perform an operating mode out of load. This control procedure will now be described with reference to FIG. 3.
    Fig. 3 is a motion graph illustrating the control steps performed by the arithmetic device 31 in accordance with the present. exemplary embodiment.
    When a stop instruction is given via the control board 34, in step 100, the arithmetic device 31 proceeds to step 110 to determine whether the ejection pressure Pd, which is detected by the the ejection pressure 28 is equal to or less than or less than the upper limit drying pressure Pk (as illustrated in Fig. 2 described above, a predetermined threshold and stored in the storage device For example, Pk = 0.11 MPa (abs)). For example, if the ejection pressure Pd exceeds the upper limit drying pressure Pk, the result of the determination in step 110 is negative, and the arithmetic device 31 proceeds to step 120 so as to execute the mode. operating procedure. More specifically, for example, if the stopping instruction is given during the load procedure, since the ejection pressure Pd normally exceeds the upper limit drying pressure Pk, the arithmetic device 31 switches to the operating procedure. Further, for example, even when the stopping instruction is given during the out-of-charge procedure, if the ejection pressure Pd exceeds the upper limit drying pressure Pk, then, in step 120, the arithmetic device 31 continues the out-of-charge procedure until the result of the determination step of step 100 becomes affirmative.
    For example, in step 110, if the ejection pressure Pd is equal to or less than the upper limit drying pressure Pk, the result of the determination is affirmative. The arithmetic device 31 therefore proceeds to step 130 so as to switch to the dry mode of operation. Subsequently, the arithmetic device 31 uses the timer 32 to calculate the duration of the dry mode. When the duration of the dry mode reaches a predetermined time ta (for example, from 1 minute to 5 minutes), the arithmetic device 31 proceeds to step 140 so as to stop the compression unit.
    The implementation of this exemplary embodiment will now be described with reference to FIG. 4. The
    Fig. 4 is a timeline illustrating the implementation in accordance with this exemplary embodiment.
    For example, when the operator actuates the start button of the control panel 34, the compression unit starts to act to operate the load mode. During the charging procedure, the arithmetic device 31 opens the water supply valve 14 to supply water to the activation chamber located in the main body of the compressor 1. The arithmetic device 31 also closes the valve. release of the air 27A (and opens the suction control valve 6) so as to variably control the number of rotations of the engine 2 and allow the main body of the compressor 1 to implement the mode operating in charge.
    For example, when the operator actuates the stop button of the control panel 34 during the load procedure, since the ejection pressure Pd exceeds the upper limit drying pressure Pk = 0.11 MPa (abs. ), the arithmetic device 31 switches to the off-load operating mode (steps 100 to 120 of Fig. 3 described above). In the off-load mode, the arithmetic device 31 opens the water supply valve 14 to supply water to the activation chamber located in the main body of the compressor 1. The arithmetic device. 31 also opens the air release valve 27A (and closes the suction adjustment valve 6) so as to reduce the number of rotations of the motor 2 to its minimum value, thus allowing the main body of the compressor 1 to implement the operating mode out of charge.
    When the ejection pressure Pd is equal to or less than the upper limit drying pressure Pk, the arithmetic device 31 switches to the dry mode (step 130 of Fig. 3 described above). In dry operation, the arithmetic device 31 closes the water supply valve 14 so as to stop the water supply at the activation chamber located in the main body of the compressor 1. The arithmetic device 31 also opens the water supply valve 14. air release valve 27A (and closes the suction control valve 6) so as to reduce the number of rotations of the engine 2 to its minimum value, thereby allowing the main body of the compressor 1 to implement the operating mode out of charge. Subsequently, when the duration of the dry mode reaches the predetermined time ta, the compression unit is stopped (step 140 of Fig. 3 described above).
    Thus, in the context of this embodiment, the dry mode is executed before the compression unit is stopped. This allows the inner part of the main body of the compressor 1 to be dried. As a result, the inner portion of the main body of the compressor 1 can be protected against corrosion while the compression unit is stopped. In addition, for example, in a cold region, the present embodiment may prevent water remaining inside the main body of the compressor from freezing and thus render the compressor unusable.
    In addition, in the present embodiment, if the ejection pressure Pd exceeds the upper limit drying pressure Pk, the off-load operating mode is implemented. Thus, when the ejection pressure Pd is equal to or less than the upper limit drying pressure Pk, the out-of-charge operating mode switches to the dry operation mode. Therefore, the present exemplary embodiment can eliminate any side effects that adversely affect compression performance. This will be described in more detail below.
    A relational expression for a pressure ratio obtained using the theoretical adiabatic pressure and the temperature of the air ejected when the water is not introduced into the activation chamber located in the main body of the compressor 1 is expressed by Expression 1 illustrated below. In Expression 1, Td denotes the temperature of the ejected air (K), Ts designates the temperature of the sucked air (K), Pd designates the ejected air pressure (MPa (abs)), Ps designates the suction air pressure (MPa (abs)), (k) designates a specific thermal value, and (m) designates a compression coefficient.
    [Expression 1]
    Fig. 5 is a characteristic diagram v illustrating the relationship between the pressure ratio Pd / Ps and the ejected air temperature Td (° C) determined by Expression 1. In FIG. 4, we assume the following: the specific thermal value (k) = 1.4, the compression coefficient (m) = 1, and the temperature of the ejected air Ts = 295k = 20 ° C.
    For example, it is assumed that the main body of the compressor 1 is allowed to implement a load mode without supplying water to the activation chamber located in the main body of the compressor 1. Thus, when the pressure of the air ejected Pd = 0.80 MPa (abs) and that the suction air pressure Ps = 0.10. MPa (abs) (atmospheric pressure) (ie when the pressure ratio Pd / Ps = 8), the temperature of the air ejected Td = 256 ° C. However, in the case of the current load operating mode, the main body of the compressor 1 is allowed to implement a load mode while supplying water to the activation chamber located in the main body of the compressor 1. Thus, the temperature of the ejected air Td decreases to about 60 ° C.
    In addition, for example, it is assumed that the main body of the compressor 1 is allowed to implement an off-load operating mode without supplying water to the activation chamber located in the main body of the compressor 1. Thus, since a small amount of pressure remains in the activation chamber located in the main body of the compressor 1, when the air pressure ejected Pd = 0.30 MPa (abs) and the air pressure aspirated Ps = 0.05 MPa (abs) (ie when the pressure ratio Pd / Ps = 6), the temperature of the air ejected Td = 216 ° C. Thus, if the dry procedure is performed under these temperature conditions, the screw rotors 4A and 4B must be pre-designed so as to enlarge the space between the members while taking into account their possible thermal expansion. This affects the compression efficiency. On the other hand, if the pressure in the activation chamber located in the main body of the compressor 1 decreases and when the air pressure ejected Pd = 0.11 MPa (abs) and the pressure of the air sucked Ps = 0.05 MPa (abs) (i.e., when the pressure ratio Pd / Ps = 2.2), the temperature of the ejected air Td drops to 94 ° C. Therefore, when the dry procedure is operated under these temperature conditions (e.g., in the range of 50 ° C to 100 ° C), the screw rotors 4A and 4B need not be preconceived for way to greatly enlarge the space between the members. Therefore, the present exemplary embodiment can eliminate the possible side effects on compression efficiency.
    In the first exemplary embodiment, the following control device has been described by way of examples. The. arithmetic device 31 in the control panel 3 determines whether the ejection pressure Pd detected by the ejected pressure sensor 28 is equal to or less than or less than the upper limit drying pressure Pk. If the ejection pressure Pd exceeds the upper limit drying pressure Pk, the arithmetic device 31 executes the out-of-charge mode. Thus, when the ejection pressure Pd is equal to or lower than the upper limit drying pressure Pk, the arithmetic device 31 executes the dry mode. However, the present invention is not limited to this control device. As a result, for example, as illustrated in FIG. 6, an ejection temperature detector 35 configured to detect the ejection temperature Td of the main body of the compressor 1 may be provided. Thus, the arithmetic device 31 in the control panel 3 can determine whether the ejection temperature Td detected by the ejection temperature detector 35 is equal to or less than or less than an upper limit drying temperature Tk (A predetermined threshold and stored in the storage device 30, for example, 100 ° C). If the ejection temperature Td exceeds the upper limit drying temperature Tk, the arithmetic device 31 executes the out-of-charge operating mode. Thus, when the ejection temperature Td is equal to or lower than the upper limit drying temperature Tk, the arithmetic device 31 can execute the dry mode. In this case also, effects similar to those of the first embodiment may be encountered.
    A second exemplary embodiment of the present invention will now be described with reference to FIGS. 7 and 8. In the present exemplary embodiment, the components equivalent to those of the first exemplary embodiment are designated by the same reference numerals. The description of these components is intentionally omitted.
    In the present exemplary embodiment, the arithmetic device 31 in in the control panel executes the dry mode while the compression unit is stopped. This control procedure will be described with reference to FIG. 6. FIG. 6 is a motion graph illustrating the steps of the control process performed by the arithmetic device 31 according to the present embodiment.
    In step 200, the arithmetic device 31 stops the compression unit 200. The arithmetic device 31 then proceeds to step 210 to determine whether a start instruction has been given or not by the For example, if a start instruction was given by the control board 34, the result of the determination of step 210 is affirmative. The arithmetic device 31 therefore proceeds to step 240 so as to initiate the start of the compression unit (in other words, the arithmetic device 31 executes the load mode). On the other hand, for example, if no start instruction has been given by the control board 34, the result of the determination of step 210 is negative. The arithmetic device 31 therefore goes to step 230.
    . In step 230, the arithmetic device 31 uses the timer 32 to calculate the period t1 during which the compression unit has been stopped. The arithmetic device 31 then proceeds to step 240 so as to determine whether the stopping time t1 is equal or not, or greater or not, to a predetermined time interval tp. For example, if the dwell time t1 is shorter than the predetermined time interval tp, the result of the determination of step 240 is negative. The arithmetic device 31 therefore returns to step 200 so as to repeat a procedure similar to that described above. On the other hand, if the dwell time t1 is equal to or greater than the predetermined time interval tp, the result of the determination in step 240 is affirmative. The arithmetic device 31 therefore proceeds to step 250 so as to execute the dry procedure.
    Thus, the arithmetic device 31 proceeds to step 260 to determine whether or not a start command is given by the control panel 34 during the dry procedure. For example, if a start instruction was given by the control board 34, the result of the determination in step 260 is affirmative. The arithmetic device 31 therefore proceeds to step 220 so as to initiate the start of the compression unit (in other words, it switches to the load mode). On the other hand, for example, if no start instruction has been given by the control board 34, the result of the determination in step 260 is negative. The arithmetic device 31 therefore goes to step 270.
    In step 270, the arithmetic device 31 uses the timer 32 to calculate the duration t2. dry procedure. The arithmetic device 31 then proceeds to step 280 so as to determine whether the duration t2 of the dry mode is equal to or not greater than or equal to a predetermined time interval ta. For example, if the duration t2 is shorter than the predetermined time interval ta, the result of the determination in step 280 is negative. The arithmetic device 31 therefore returns to step 250 so as to repeat a procedure similar to that described above. On the other hand, if the duration t2 is equal to or greater than the predetermined time interval ta, the result of the determination in step 280 is affirmative. The arithmetic device 31 therefore returns to step 200 so as to stop the compression unit.
    The implementation of this exemplary embodiment will now be described with reference to FIG. 8. FIG. 8 is a time chart illustrating an operation according to the present example embodiment.
    For example, as is the case in the first embodiment described above, when the operator actuates the stop button of the control panel 34 during the load mode, the load mode switches to the operating mode out of charge. Thus, when the ejection pressure Pd is equal to or less than the upper limit drying pressure Pk, the out-of-charge operating mode switches to the dry operation mode. Subsequently, when the duration of the dry mode reaches the predetermined time interval ta, the compression unit is stopped. Thus, until the start button of the control panel 34 is actuated, the dry mode is executed for the predetermined time interval each time the compression unit stopping time reaches the predetermined time tp.
    Thus, in the present embodiment, the dry mode is executed while the compression unit is stopped. Thus, the inner part of the main body of the compressor 1 can be dried even if condensation appears while the compression unit is stopped. Therefore, the inner part of the main body of the compressor 1 can be protected against corrosion while the compression unit is stopped.
    In the first and second exemplary embodiments described above, by way of example, a start command or a stop command is given to the arithmetic device 31 in the control panel 3 if the operator actuates the start button or the stop button on the control panel 34. However, the present invention is not limited to this configuration. In this way, for example, a series of start and stop instructions for the compression unit can be pre-set and stored in the storage device 30 in the control panel 3. Thus, an instruction A start-up instruction or stop instruction can be automatically given according to this set of instructions. In this case also, effects similar to those of the embodiments described above obtained.
    In addition, in the second exemplary embodiment described above, by way of example, the arithmetic device 31 in the control panel 3 executes the dry mode each time the stopping time of the compression unit corresponds to the predetermined time interval tp. However, the present invention is not limited to this configuration. Thus, for example, a series of start and stop instructions for the compression unit and the duration of the shutdown time of the compression unit when the dry mode is to be executed, can be preset and stored in the storage device 30 in the control panel 3. Thus, the dry mode. can be executed according to the set of instructions and time. Alternatively, the following configuration is possible. For example, if the operator actuates the stop button on the control panel 34 while the compression unit is stopped, a start instruction for the dry operation mode is given. Thus, the dry mode can be executed in accordance with the start-up instruction. In this case also, effects similar to those of the embodiments described above obtained.
    A third embodiment of the present invention will now be described with reference to FIGS. 9 and 10. In the present exemplary embodiment, the components equivalent to those of the first exemplary embodiment are designated by the same reference numerals. The description of these components is intentionally omitted.
    In the present exemplary embodiment, the arithmetic device 31 in the control panel 3 switches to the dry operation mode when the normal non-load operating mode (in other words, the out-of-charge operating mode executed when no instruction has been issued. stopping has been performed) has been executed for a predetermined period of time. Thus, when the dry mode has been executed for the predetermined time interval ta, the arithmetic device 31 switches to the stop mode. This control procedure will now be described with reference to FIG. 9. FIG. 9 is a motion graph illustrating the steps of the control process executed by the arithmetic device 31 in accordance with the present exemplary embodiment.
    In step 300, the arithmetic device 31 executes the loaded mode of operation. The arithmetic device 31 then proceeds, in step 310, so as to determine whether the supply pressure Pd1 detected by the detector of the supply pressure 29 is equal to or not greater than or equal to the maximum pressure PH. For example, if the supply pressure Pd1 is lower than the maximum pressure PH, the result of the determination in step 310 is negative. The arithmetic device 31 returns to the step 300 described above so as to continue the charging procedure.
    On the other hand, for example, if the supply pressure Pd1 is equal to or greater than the maximum pressure PH, the result of the determination in step 310 is affirmative. The arithmetic device 31 therefore proceeds to step 320 so as to switch to the off-load operating mode.
    Thus, the arithmetic device 31 proceeds to step 330 so as to determine whether the supply pressure Pdl detected by the detector of the supply pressure 29 is equal or not equal to or less than the minimum pressure PL. For example, if the supply pressure Pd1 is equal to or lower than the minimum pressure PL, the result of the determination in step 330 is affirmative. The.
    Arithmetic device 31 therefore returns to step 300 described above so as to switch to the load mode. On the other hand, for example, if the supply pressure Pdl exceeds the minimum pressure PL, the result of the determination, in step 330, is negative. The arithmetic device 31 therefore proceeds to step 340 and uses the timer 32 so as to calculate the duration t3 of the out-of-charge procedure. The arithmetic device 31 then proceeds to step 350 so as to determine whether the duration t3 of the out-of-charge procedure is equal to or not or greater than the predetermined time interval tu. For example, if the duration t3 of the out-of-charge procedure is shorter than the predetermined period of time T0, the arithmetic device 31 returns to the step 320 described above so as to repeat a procedure similar to that described above. above. On the other hand, if the duration t3 of the out-of-charge procedure is equal to or greater than the predetermined time interval T0, the arithmetic device 31 switches to step 360. In step 360, the arithmetic device 31 determines whether the ejection pressure Pd detected by the ejection pressure detector 28 is equal to, not or less than, the upper limit drying pressure Pk. For example, if the ejection pressure Pd exceeds the upper limit drying pressure Pk, the result of the determination in step 360 is negative. Arithmetic device 31 therefore returns to step 320 described above so as to repeat a procedure similar to that described above. On the other hand, for example, if the ejection pressure Pd is equal to or less than the upper limit drying pressure Pk, the arithmetic device 31 proceeds to step 370 so as to switch to the dry mode of operation.
    Thus, the arithmetic device 31 proceeds to step 380 so as to determine whether the supply pressure Pdl detected by the detector of the supply pressure 29 is equal or not equal to or less than the minimum pressure PL. For example, if the supply pressure Pd1 is equal to or less than the minimum pressure PL, the result of the determination in step 380 is affirmative. The arithmetic device 31 therefore returns to the step 300 described above so as to switch to the mode. • operative - in charge. On the other hand, if the supply pressure Pdl exceeds the minimum pressure PL, the result of the determination, in step 380, is negative. The arithmetic device 31 therefore proceeds to step 390. and uses the timer 32 to calculate the duration t2 of the dry mode. The arithmetic device 31 then proceeds to step 400 so as to determine whether the duration t2 of the dry mode is equal to or not greater than or equal to the predetermined time interval ta. For example, if the duration t 2 of the dry procedure is shorter than the predetermined time interval ta, the arithmetic device 31 returns to the step 370 described above so as to repeat a procedure similar to that described above. . On the other hand, for example, if the duration, t 2 of the dry mode is equal to or greater than the predetermined time interval ta, the arithmetic device 31 proceeds to step 410 so as to switch to the stop mode.
    The implementation of this exemplary embodiment will now be described with reference to FIG. 10. FIG. 10 is a timeline illustrating an implementation in accordance with this exemplary embodiment.
    For example, when the amount of compressed air used by the user decreases and the supply pressure Pd1 reaches the maximum pressure PH during the load operation, the arithmetic device 31 switches to the out-of-charge operating mode. (Steps 300 to 320 of Fig. 9 described above). Thus, for example, when the duration t3 of the out-of-charge operating mode reaches the predetermined lapse of time T0 while the supply pressure Pd1 does not decrease at the level of the minimum pressure PL and the ejection pressure Pd is equal or lower than the upper limit drying pressure Pk, the arithmetic device 31 switches to the dry mode (steps 320 to 370 of Fig. 9 described above). Thus, for example, when the duration t 2 of the dry operation mode reaches the predetermined time interval T 0 while the supply pressure P d 1 does not decrease at the level of the minimum pressure PL, the arithmetic device 31 switches to the operating mode. stopping (steps 370 to 410 of FIG.
    9 described above). Subsequently, for example, when the supply pressure Pdl decreases at the level of the minimum pressure PL, the arithmetic device 31 switches to the load mode.
    In the present exemplary embodiment, when the duration t3 of the off-load operating mode reaches the predetermined time interval T0, the arithmetic device 31 switches to the dry operating mode. When the duration t2 of the dry mode reaches the predetermined time interval ta, the arithmetic device 31 switches to the stop mode. As a result, the inner part of the main body of the compressor 1 can be dried by executing the dry procedure before stopping the main body of the compressor 1. Therefore, the inner part of the main body of the compressor 1 can be protected from corrosion during shutdown mode.
    In addition, in the present embodiment, the arithmetic device 31 switches to the dry mode when both of the following conditions are met: the duration t3 of the out-of-charge procedure corresponds to the predetermined time lapse tu, and the pressure Pd ejection is equal to or lower than the upper limit drying pressure Pk. Thus, as is the case in the first embodiment described above, the present exemplary embodiment can eliminate the possible side effects on the performances of the compression.
    Although not specifically described in the third exemplary embodiment, the arithmetic device 31 in the control panel 3 can determine whether or not the ejection pressure Pd exceeds the upper limit drying pressure Pk during the dry procedure. and switches to the out-of-charge mode if the ejection pressure Pd exceeds the upper limit drying pressure Pk. In addition, for example, the following procedure is possible. If the number of times the dry procedure has been interrupted and switched to the out-of-charge mode is a specified value, the compression unit is stopped and a liquid crystal display or lamp. the control panel 34 (or the transmission of a signal at a remote position) can be used to give the alarm.
    In addition, in the third embodiment described above, the following control device has been described by way of example. The arithmetic device 31 in the control panel 3 switches to the dry mode when the following two conditions are met: the duration t3 of the out-of-charge operating mode corresponds to the predetermined time lapse tu, and the ejection pressure Pd detected by the ejection pressure sensor 28 is equal to or less than the upper limit drying pressure Pk. However, the present invention is not limited to this configuration. As a result, for example, as shown in -Fig. 6 described above, an ejection temperature detector 35 configured to detect the ejection temperature Td of the main body of the compressor 1 may be provided. Thus, the arithmetic device 31 in the control panel 3 can switch to the dry mode when both of the following conditions are met: the duration t3 of the off-load operating mode corresponds to the predetermined time lapse tu, and the temperature of Td ejection detected by the ejection temperature detector 35 is equal to or less than the upper limit drying temperature Tk. Alternatively, the arithmetic device 31 can determine whether the ejection temperature Td detected by the ejection temperature detector 35 is equal to or less than or less than the upper limit drying temperature Tk, and switches to the off-load operating mode if the ejection temperature Td exceeds the upper limit drying temperature Tk. In addition, for example, the following configuration is possible. If the number of times the dry procedure has been interrupted and switched to the no-load mode is a specified value, the compression unit is stopped and a liquid crystal display or indicator lamp is present on the control panel 34 (or the transmission of a signal to a remote position) can be used to sound the alarm.
    In the description given above, as illustrated in FIG. 1 described above, an air release valve 27A is provided in the water injection compressor, by way of example. However, the present invention is not limited to this configuration. As a result, for example, as illustrated in FIG. 11, an air release pipe 26B which stretches upstream of the. non-return valve 24 in the compressed air pipe 21 may also be provided. In addition, an air release valve 27B may be provided and is configured to be able to release compressed air at the air release pipe 26B. The air release valve 27B is not nested with the suction control valve 6 but allows the air to be released via a muffler 3. for example, as illustrated in FIG. 12, so as to switch from the load mode to the out-of-box operating mode, the control panel 3 can simultaneously open the air release valves 27A and 27B or can open the air release valve 27A and, a brief moment later, open the air release valve 27B. This increases the air release rate and allows the Pd ejection pressure to be quickly reduced during the off-load operating mode so that the out-of-charge operating mode can switch to the dry operation mode. . In addition, for example, as illustrated in FIG. 13, the following configuration is possible. In the out-of-charge mode and the dry mode, the air release valve 27A is closed (and the suction control valve 6 is open), and the air release valve 27B is open. While the compression unit is stopped (or in stop mode), both air release valves 27A and 27B can be opened. During such a control procedure, as illustrated in FIG. 13, during the out-of-charge procedure and the dry procedure, the suction pressure PS - = 0.10 MPa (abs). Thus, the upper limit drying pressure Pk can be set to a larger value of 0.22 MPa (abs). Therefore, the control panel 3 may switch earlier to the dry mode. As a result, energy can also be saved.
    In addition, in the description given above, as illustrated in FIG. 1 (and in Fig. 4) described above, the non-return valve 24 is provided on the secondary side of the separation tank 9, and the air release pipe 26A (and the air release 26B) which extends upstream of the non-return valve 24 is provided by way of example. However, the present invention is not limited to this configuration. As a result, for example, as illustrated in FIG. 14, the non-return valve 24 may be provided on the primary side of the separation tank 91, and the air release pipe 26A (and the air release pipe 26B) which extends upstream. of the non-return valve 15 may be provided. This reduces the amount of air released by the air release valve 27A (and the air release valve 27B) and greatly reduces the ejection pressure Pd during the out-of-charge procedure. so that the out-of-charge mode can switch to the dry mode. As a result, energy can also be saved. In addition, if the non-return valve 24 is provided on the primary side of the separation tank 9, the suction control valve 6 can be dispensed with, and the air release valve 27A (and the air release valve 27B) can be opened to release air into the atmosphere.
    In addition, in the description given above, the ejection pressure detector 28 (and the ejection temperature detector 35) is provided on the primary side of the separation tank 9, by way of example. However, the present invention is not limited to this configuration. For example, the. the ejection pressure detector 28 (and the ejection temperature detector 35) can be provided on the secondary side of the separation tank 9. In addition, in the description given above, the detector of the Supply pressure 29 is provided inside the compression unit, by way of example. However, the present invention is not limited to this configuration. The detector of the supply pressure. 29 may be provided outside the compression unit. In addition, in the description given above, the ejection pipe 8 configured to connect the main body of the compressor 1 to the separation tank 9 is provided by way of example. However, the present invention is not limited to this configuration. The main body of the compressor 1 can be directly connected to the separation tank 9. In addition, in the description given above, the water cooler 11 is of the chiller type with the aid of cooling air, as a 'example. However, the present invention is not limited to this configuration. The water cooler 11 may be of the coolant type with cooling water. In addition, the air release pipe 26A (and the air release pipe 26B) may comprise a collection device configured to collect the water contained in the released air.
    In addition, in the description given above, a target application of the present invention is the water injection air compressor configured to variably control the number of engine rotations. example. However, the present invention is not limited to this application and can be applied to a water injection air compressor whose number of rotations of the engine 2 is determined. In the description given above, another target application of the present invention is the water injection air compressor comprising the main body of the screw-shaped compressor 1, by way of example. However, the present invention is not limited to this application and can be applied to a water injection air compressor comprising a compressor main body of any other type.
    It should also be understood by those skilled in the art that although the foregoing description has been made to. Using examples of embodiments of the invention, the invention is not limited thereto and various changes and modifications can be made without departing from the spirit of the invention and the scope of the claims. attached.
    权利要求:
    Claims (12)
    [1]
    An air compressor of the water injection type comprising a compressor body which comprises an activation chamber for compressing air in the activation chamber, a supply line for water for supplying the water into the activation chamber, an air release valve for discharging the compressed air from the activation chamber, and a control device for controlling the supply line water and the air release valve so as to select a charging procedure in which water is introduced into the activation chamber through the water supply line while preventing the flow of water. compressed air to be discharged from the activation chamber via the air release valve and an out-of-charge operating mode in which water is introduced into the activation chamber via of the water supply line while allowing the air to co in that the control device is capable of controlling the water supply line and the pressure release valve in order to perform, in replacement of the off-load operating mode and the load operating mode, a dry procedure in which water is prevented from supplying the activation chamber via the d-line. supplying water while allowing the compressed air to be discharged from the activation chamber via the air release valve.
    [2]
    2. Water jet type air compressor according to claim 1, characterized in that the control device executes the dry procedure prior to stopping activation of the activation chamber in response. a stop instruction.
    [3]
    3. Air compressor of the water injection type according to claim 2, characterized in that the control device comprises a detector of. the pressure for measuring compressed air pressure discharged from the activation chamber; and in that the control device, in response to the stopping instruction, executes the off-load operating mode when the The measured pressure is greater than a predetermined threshold value, and executes the dry mode before preventing activation of the activation chamber after the measured pressure is greater than the predetermined threshold value.
    [4]
    4. Water injection type air compressor according to claim 2, characterized in that the control device comprises a temperature sensor for measuring the temperature of the compressed air discharged from the activation chamber. , and in that the controller executes, in response to the stop instruction, the out-of-charge mode when the measured temperature is above a predetermined threshold value, and executes the dry mode before preventing activation of the activation chamber after the measured temperature becomes greater than the predetermined threshold value.
    [5]
    5. Water injection type air compressor according to claim 1, characterized in that the control device executes the dry mode in response to the flow of each predetermined period of time, the time period during which activation of the activation chamber is prevented.
    [6]
    A water jet type air compressor according to claim 1, characterized in that the control device executes the dry mode at a predefined time after activation of the activation chamber has been completed. been prevented.
    [7]
    7.Compress.eur. water injection type air filter according to claim 1, characterized in that the control device executes the dry mode in response to an instruction from an air compressor operator after activation of the activation chamber was prevented.
    [8]
    8. Water jet type air compressor according to claim 1, characterized in that the control device executes the dry mode after the control device executes the operating mode out of charge for a first lapse of time. predetermined time, and prevents activation of the activation chamber after the controller executes the dry mode for a second predetermined period of time.
    [9]
    Water-jet type air compressor according to claim 1, characterized in that the control device comprises a pressure sensor for measuring a pressure of the compressed air discharged from the activation chamber, and in that the controller executes the dry mode after the controller executes the out-of-charge mode for a first predetermined period of time and in that the measured pressure is greater than a predetermined threshold value.
    [10]
    Water jet type air compressor according to claim 9, characterized in that the control device executes the out-of-charge mode in response to the fact that the higher pressure is greater than a predetermined threshold value during operation. execution of the dry operating mode.
    [11]
    11. Air compressor, water injection type according to claim 1, characterized in that the control device comprises a temperature detector for measuring the temperature of the compressed air discharged from the chamber. activation, and in that the controller executes the dry mode after the controller has performed the off-load mode for a first period of time. predetermined and in that the measured temperature becomes greater than a predetermined threshold value.
    [12]
    Water-jet type air compressor according to claim 11, characterized in that the control device executes the out-of-charge mode in response to the fact that the measured pressure becomes greater than a predetermined threshold value during operation. execution of the dry procedure.
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    同族专利:
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    法律状态:
    2021-10-27| MM| Lapsed because of non-payment of the annual fee|Effective date: 20210228 |
    优先权:
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    JP2009057997|2009-03-11|
    JP2009057997A|JP5248373B2|2009-03-11|2009-03-11|Water jet air compressor|
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