• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    When a compressor is restarted on an inverter trip after a restart wait time, which is preliminarily set to reduce a pressure on a discharge side of a main body of the compressor to a pressure at which the main body of the compressor can be restarted, has elapsed, conditions under which the inverter trip occurs are detected and restart is executed according to the conditions detected after the times of stimulus expectation, which are different from each other, have passed. At least two types of restart wait times are provided, and the restart wait time immediately after switching on is shorter than the others. Therefore, when a trigger occurs immediately after the inverter is turned on, a restart can be executed in a short time.
    公开号:BE1019036A3
    申请号:E2009/0057
    申请日:2009-02-04
    公开日:2012-02-07
    发明作者:Shingo Goto
    申请人:Hitachi Ind Equipment Sys；
    IPC主号:
    专利说明:

    METHOD FOR CONTROLLING INVERTER COMPRESSOR AND INVERTER COMPRESSOR
    The present invention relates to a restart command (restart command) when inverter triggering of an inverter compressor occurs.
    As an example of an inverter compressor, there is an oil-cooled screw-in compressor. The oil-cooled screw compressor delivers a lubricant to a screw unit of the compressor. However, when the compressor stops, the lubricant remains slightly inside a main body of the compressor. Thus, when the compressor is started at a lower temperature than, for example, the lower limit of a specification temperature, the viscosity of the lubricant remaining inside the main body of the compressor increases to generate a torque. excessively driven by the compression of the lubricant immediately after start-up, thereby generating an overcurrent to cause tripping in the inverter in some cases. In addition, even in an oil-less compressor, the viscosity of a lubricant remaining in a bearing unit is increased when a main body of the compressor is turned on, possibly resulting in the generation of excessive torque and overcurrent tripping of the inverter at the moment of start-up. In particular, a high efficiency synchronous motor as a drive motor strongly presents this trend due to a low starting torque. As a related art of such a boost control when inverter triggering occurs, Japanese Patent No. 3255213, entitled "CONTROL METHOD FOR PACKAGE SCREW TYPE COMPRESSOR AND CONTROL DEVICE" is provided.
    In the related art described above, when the inverter trip occurs, a restart command (restart command) is executed after an internal pressure (a pressure on the discharge side of the main body of the compressor) of a separator 6 is reduced to a pressure (a pressure at which the start torque becomes sufficiently low) where the main body of the compressor can be restarted.
    In addition, when the compressor stops due to the triggering circumstance in the oil-cooled screw compressor, the air mixed with the lubricant in the separator rises to an upper surface of the lubricant inside. of the separator while expanding in conjunction with the reduction of the internal pressure of the separator to generate a boiling phenomenon. When the boiling phenomenon is excessively generated, there is a problem, namely the lack of lubricant at the time of start-up due to the consumption of the lubricant caused by the boiling phenomenon. Thus, a fairly long time, for example, of about 10 to 30 seconds, is necessary to reduce the internal pressure of the separator to a pressure nearly equal to atmospheric pressure. So, as a raise wait time, an identical time is needed. In an example of the related art described above, the waiting time is set to 20 seconds.
    In the meantime, in the event that the trip occurs immediately after the inverter is turned on, the pressure on the discharge side of the compressor main body barely increases from the pressure at which the compressor waits before putting the compressor into operation. in operation, and it is not necessary to reduce the pressure on the discharge side of the compressor. Thus, the compressor can be immediately restarted. However, since the recovery wait time is uniformly set to 10 to 30 seconds from the point of view of suppressing boiling inside the separator, as described above, it is necessary to wait for a long time before the restart, even in the case of an inverter trip immediately after switching on, and the pressure required in the compressor can not be ensured without delay.
    The present invention provides a method of controlling an inverter compressor and an inverter compressor in which when a trip occurs immediately after the inverter is turned on, a restart can be executed within a short time. .
    In order to solve the problem described above, the present invention provides a method of controlling an inverter compressor in which, when an inverter trip occurs, the compressor is restarted after a period of time. recovery waiting, which is preliminarily set to reduce pressure on a discharge side of a compressor main body to a pressure at which the main body of the compressor can be restarted, has elapsed, in which conditions during which the inverter trip occurs are detected and restarting is performed within the recovery wait times that are different from each other according to the sensed conditions.
    Further, as described above, an elapsed time of operation, from the moment the inverter is turned on to the moment the trigger occurs, is detected, and the restart wait time is determined according to the detected operating time.
    In addition, as described above, the rotational speed of a motor immediately before the inverter trip occurs is detected, and the restart wait time is determined according to the rotational speed. detected from the engine.
    Further, as described above, the pressure on the discharge side of the compressor main body when the inverter trip occurs is detected, and the restart wait time is determined according to the detected pressure. .
    In addition, at least two different types of recovery wait times are set, and t2 <t1 is set where t2 indicates the restart wait time when the trip occurs immediately after that the inverter is turned on and tl indicates the restart wait time when the trip occurs in a normal operation of the inverter.
    In addition, the present invention provides an inverter compressor that is restarted after a restart delay, which is preliminarily set to reduce pressure on a discharge side of a compressor main at a pressure at which the main body of the compressor can be restarted, has elapsed when an inverter trip occurs, in which there is provided a control unit which detects conditions when the inverter trip occurs and sends a restart instruction within the recovery wait times that are different from each other according to the detected conditions.
    In addition, the control unit includes a detection unit which detects an elapsed time of operation from the moment at which the inverter is turned on to the moment at which the trigger occurs, and the time of operation. Recovery time is determined according to the detected operating time.
    In addition, the control unit includes a detection unit that detects the rotational speed of an engine immediately before the inverter trip occurs, and the restart wait time is determined according to the speed of rotation. detected rotation of the motor.
    In addition, the control unit includes a sensing unit that detects the pressure on the discharge side of the main body of the compressor when the inverter trip occurs, and the restart wait time is determined according to the pressure. detected.
    In addition, the control unit comprises memories which store at least two types of restart waiting times which are different from each other, and t2 <t1 is set where t2 indicates the waiting time of restart when the trip occurs immediately after the inverter is turned on and tl indicates the restart wait time when the trip occurs in normal operation of the inverter.
    According to the present invention, a necessary restart delay is ensured when an inverter trip occurs in normal operation and the restart wait time can be shortened when the inverter trip occurs immediately after start-up, so that restarting can be performed within a short time and necessary pressure can be provided without delay.
    ^ BRIEF DESCRIPTION OF THE FIGURES
    Fig. 1 is a flow control flow diagram according to a first embodiment of the present invention; Figure 2 is an operating flow chart according to the first embodiment of the present invention; Fig. 3 is a timing diagram in the event that a trip occurs in nominal operation in the first embodiment of the present invention; and Fig. 4 is a timing diagram in the event that the trip occurs immediately after switching on in the first embodiment of the present invention.
    DETAILED DESCRIPTION OF THE EMBODIMENTS PREFERRED
    Hereinafter, a first embodiment of the present invention will be described.
    (First embodiment)
    Fig. 1 is a diagram for showing a flow of an oil cooled screw compressor. Reference numeral 1 denotes a main body of the oil-cooled screw compressor which is rotatably driven by, for example, a synchronous motor 2. The main body 1 of the compressor which is rotatively driven sucks in the air in the atmosphere through a filter 3 and a suction non-return valve 4 for compressing the air to a predetermined pressure. Since the compressed air in the main body 1 of the compressor contains a lubricant, the compressed air is substantially separated from the lubricant by an oil separator 5, and then is discharged to an external load of a housing 8 through a non-return valve 6 and a compressed air heat exchanger 7. On the other hand, the lubricant which is separated from the compressed air by the oil separator 5 is distributed to the main body 1 of the compressor at again after the lubricant temperature is automatically adjusted via a lubricant temperature control valve 9 and a lubricant heat exchanger 10.
    A control unit 12 sends an operating instruction to an inverter 13 to operate the motor 2, and controls the rotational speed of the motor 2 according to the pressure that is sensed by a pressure sensing unit 11 to be pushed back to the external load. The reference numeral 14 indicates a discharge valve which is opened or closed by the control unit 12 and through which the pressure on the discharge side of the compressor is discharged. The discharge valve is opened at the same time as an inverter trip occurs, and is closed at the same time as when an inverter restart wait time has elapsed.
    The control unit 12 comprises a detection unit 12a which detects an elapsed time of operation from the moment at which the inverter 13 is switched on until the instant at which the triggering occurs, and memories 12b and 12c which store tl and t2 invertor restart wait times, respectively. Both waiting times satisfy the relation of t1> t2. In addition, an operating logic shown in FIG. 2 is incorporated in the control unit 12. In FIG. 2, tm indicates the elapsed time of operation from the instant at which the inverter 13 is turned on until At the instant at which the trip occurs, t3 indicates a pre-set standard elapsed time which corresponds to an elapsed time (e.g., about 1 second) from the instant at which the inverter 13 is turned on until at the instant immediately after the inverter 13 is turned on, and tr indicates a restart delay.
    Now, a restart control operation (restart command) after the inverter causes the trip will be described. When the inverter turned on triggers, the detection unit 12a of the control unit 12 detects the elapsed time of operation tm until the triggering event in step S101 of FIG. tm is detected as the time elapsed from the moment the inverter is turned on until the instant at which the trip occurs.
    At the same time, the discharge valve 14 is opened with an instruction from the control unit 12, and the pressure of the oil separator 5 begins to be reduced.
    Then, the elapsed time of operation tm and the standard elapsed time t3 are compared with each other in step S102. In the case where the comparison result has tm t3, the time t1 in the memory 12b is selected as the restart wait time tr in the step S103 to wait during the time t1 in a state in which Inverter is stopped after the triggering circumstance. Then, after the time has elapsed, the check valve 14 is closed in step S105, and the inverter is restarted. The time tm at this time exceeds the time (standard elapsed time) immediately after the inverter 13 is turned on, and the compressor is in a nominal operation or is operated at a level at which the compressor is started up. to nominal operation, so that the internal pressure on the discharge side is increased.
    The time t1 is set to a time (e.g., 10 to 30 seconds) during which the internal pressure of the oil separator 5 is discharged through the discharge valve 14 so that the internal pressure is reduced to a minimum. pressure at which the inverter can be restarted within the restart wait time. Therefore, if the inverter is restarted after the time has elapsed, the engine is reliably started and the compressor is driven.
    In the case where tm <t3 is satisfied in step S102, the time t2 in the memory 12c is selected as the restart wait time tr in the step S04 to wait in the time t2 in a state in which the inverter is stopped after the circumstance of. trigger. So, after that time t2. has passed, the inverter is restarted in step SI05. Since the time tm at this instant corresponds to the moment immediately after the inverter 13 is turned on, the compressor is barely put into operation, and the pressure (the pressure of the oil separator 5) on the the discharge side of the compressor main body barely increases from the pressure before switching on. The time t2 is set to a sufficiently short waiting time (for example, 5 seconds) because it is not necessary to reduce the pressure of the oil separator 5. Therefore, if the inverter is restarted within a short time after the triggering circumstance, it is possible to run the motor reliably.
    Fig. 3 is a timing diagram for showing a restart operation when an output current value is rapidly increased and the trip occurs in the state where tm is t3 during the operation of the inverter 13 in a normal state. Since the elapsed time of operation tm from the moment at which the inverter is turned on (the time at which the operating instruction is generated) until the moment the trigger occurs exceeds the time The standard elapsed time t3, t1, is selected as the restart wait time tr according to steps S102 and S103 of the flowchart shown in FIG. 2. The pressure of the oil separator reaches a nominal pressure PS at the instant at which the tripping occurs and a torque (load) at the time of restarting is too great because of the PS pressure in this state. Therefore, if the inverter is restarted, the engine can not be restarted.
    After the trip occurs, the operation instruction from the inverter 13 is stopped, and the compressor waits during the time t1 in a stopped state, so that the discharge valve 14 is opened. The discharge valve 14 is opened during the time t1, the pressure of the oil separator is reduced to a pressure at which the synchronous motor 2 can be restarted, and the pressure becomes almost equal to 0 in the figure 3. In this state, the synchronous motor 2 is stopped in a phase state driven by a latching operation of a magnetic. After the time t1 has elapsed from the triggering circumstance (after tm + tl has elapsed from start-up), the discharge valve 14 is closed and a restart control command is issued. sent by the control unit 12, so that a restarting instruction is sent from the inverter 13. The synchronous motor is restarted without fail to drive the motor, and together with this, the pressure oil separator 5 increases again.
    Fig. 4 is a timing diagram for illustrating a restart operation when an output current value is rapidly increased immediately after the inverter 13 is turned on and an overcurrent trip occurs in the state in which tm <t3. Since the elapsed time of operation tm from the instant at which the inverter is switched on until the instant at which the trip occurs does not exceed the standard elapsed time t3, t2 is selected as the time. restarting wait according to steps S102 and S103 of the flowchart shown in Fig. 2. Since the time tm at this instant corresponds to instant immediately after the inverter 13 is turned on, the pressure of the separator d 5 oil barely increases from the pressure at which the inverter waits before switching on. Therefore, a torque at the time of restart is extremely low. After the trip occurs, a restart control command is sent by the control unit 12 after the selected short recovery wait time t2 has elapsed, and a restart operation instruction is sent from of the inverter 13. The engine 2 is restarted without fail to drive the compressor, and together with this, the pressure of the oil separator 5 increases again.
    In the embodiment, the restart wait time tr is set to two types (t1 and t2), and t1 and t2 are associated with two types of elapsed time of high and low operation tm before and after the standard elapsed time. t3. However, the retry wait time setting values can be increased to a number greater than two types. In this case, the standard elapsed time type t3 can be increased according to the setting values of the restart delay time. As described above, if the types of the retry wait time setting values are increased, the restart command can be executed after the more detailed restart time has elapsed, so that restarting can be performed within a shorter time after triggering that occurs at different timings.
    Further, in the first embodiment, the restart wait time tr is selected on the basis of the elapsed operation time tm from the instant at which the operation instruction is sent (the inverter is set to run) until the moment the inverter trip occurs. However, since the elapsed time of operation tm is proportional to the rotational speed of the engine and the pressure in the oil separator 5 immediately before the triggering event, the restart waiting time tr can be selected on the base of the rotation speed (nm) and the pressure (pm) in the oil separator 5. (Second embodiment)
    In the case where the nm rotation speed of the motor is used as the basis of the second embodiment, a standard rotational speed. n3 corresponding to the standard elapsed time t3 in the first embodiment is set. When the trip occurs after the engine is turned on, the nm rotation speed of the motor as well as the triggering of the inverter are detected in step S101 of FIG. 2, and the detected rotation speed nm of FIG. motor and the standard speed of rotation n3 are compared with each other in the next step S102. In the case where the comparison result has nm to n3, t1 is selected as the restart wait time tr in step S103. In the case where the comparison result has nm <n3, t2 is selected as the restart wait time tr in step S103. The steps of operation after this are the same as those in the first embodiment.
    In the embodiment, the nm rotation speed of the motor is detected by the detection unit 12a while recovering an instruction frequency sent from the inverter 13 to the motor 2 in the control unit 12. Therefore, it is not necessary to include a rotation sensor or the like in the motor. In addition, the nm rotation speed of the motor is the basis of the embodiment. However, the compressor torque and the motor rotation speed that are needed to determine whether or not to restart are preliminarily recognized, so that the restart control can be executed only by setting the standard rotation speed n3 without trial. (Third embodiment)
    In the case where the pressure pm in the oil separator 5 is used as the basis of the third embodiment, a standard pressure p3 corresponding to the standard elapsed time t3 in the first embodiment is set. When the trip occurs after the engine is turned on, the pressure pm in the oil separator 5 as well as the triggering of the inverter are detected in the step S101 of FIG. 2, and the detected pressure pm and the standard pressure p3 are compared with each other in the next step S102. In the case where the comparison result has pm to p3, t1 is selected as the restart wait time tr in step S03. In the case where the comparison result has pm <p3, t2 is selected as the restart wait time tr in step S103. The steps of operation after this are the same as those in the first embodiment.
    In the embodiment, the pressure pm in the oil separator 5 is sent from a pressure sensor 5a installed therein and is detected by the detection unit 12a while being recovered in the unit. In addition, in the embodiment, the pressure pm in the oil separator 5 is used as the base. However, the pressure on the discharge side of the compressor that can be restarted is first recognized, so that the restart control can be executed only by setting the pressure as the standard pressure p3 without testing. In addition, if the restart command is executed after waiting for the pressure in the oil separator 5 to be reduced to a pressure at which the compressor can be restarted without using the restart wait time, the Recovery control in accordance with the actual condition can be executed, so that it is possible to control without unnecessary waiting time.
    Of course, the invention is not limited to the embodiments described above and shown, from which we can provide other modes and other embodiments, without departing from the scope of the invention. .
    权利要求:
    Claims (16)
    [1]
    A method of controlling an inverter compressor in which, when an inverter trip occurs, the compressor is restarted after a restart delay has elapsed, the waiting time has elapsed. of the stimulus being preliminarily adjusted to reduce pressure on a discharge side of a main compressor crank up to a pressure at which the main body of the compressor can be restarted, or under conditions in which the trip of inverter occurs are detected and restarting is performed within the recovery wait times that are different from each other according to the detected conditions.
    [2]
    The method of controlling an inverter compressor according to claim 1, wherein an elapsed time of operation from the instant at which the inverter is turned on until the moment at which the trigger occurs is detected. , and the restart wait time is determined according to the detected operating time.
    [3]
    The method of controlling an inverter compressor according to claim 1, wherein the rotational speed of an engine immediately before the inverter trip occurs is detected, and the restart delay is determined. according to the detected rotational speed of the motor.
    [4]
    A method of controlling an inverter compressor according to claim 1, wherein the pressure on the discharge side of the main body of the compressor when the inverter trip occurs is detected, and the restart wait time is determined according to the detected pressure.
    [5]
    The method of controlling an inverter compressor according to claim 1, wherein at least two types of restart waiting times, which are different from each other, are set, and t 2 <t 1 is set where t2 indicates the restart wait time when the trip occurs immediately after the inverter is turned on and t1 indicates the restart wait time when the trip occurs in normal operation of the inverter.
    [6]
    The method of controlling an inverter compressor according to claim 2, wherein at least two types of restart waiting times, which are different from each other, are set, and t 2 <t 1 is set where t2 indicates the restart wait time when the trip occurs immediately after the inverter is turned on and t1 indicates the restart wait time when the trip occurs in normal operation of the inverter.
    [7]
    A method of controlling an inverter compressor according to claim 3, wherein at least two types of restart waiting times, which are different from each other, are set, and t2 <t1 is set where t2 indicates the restart wait time when the trip occurs immediately after the inverter is turned on and t1 indicates the restart wait time when the trip occurs in normal operation of the inverter.
    [8]
    The method of controlling an inverter compressor according to claim 4, wherein at least two types of restart waiting times, which are different from each other, are set, and t 2 <t 1 is set where t2 indicates the restart wait time when the release occurs immediately after the inverter is turned on and t1 indicates the restart wait time when the trip occurs in normal operation of the inverter.
    [9]
    9. Inverter compressor that is restarted after a restart delay has elapsed when an inverter trip occurs, the restart wait time being preliminarily set to reduce a pressure on a discharge side of a main body of the compressor to a pressure at which the main body of the compressor can be restarted, wherein there is provided a control unit which detects conditions in which the inverter trip is produces and sends a restart instruction within the recovery wait times that are different from each other according to the sensed conditions.
    [10]
    Inverter compressor according to claim 9, wherein the control unit comprises a detection unit which detects an elapsed time of operation from the moment at which the inverter is switched on until the moment at which the trip occurs, and the restart wait time is determined according to the detected operating time.
    [11]
    Inverter compressor according to claim 9, wherein the control unit comprises a detection unit which detects the rotational speed of an engine immediately before the inverter trip occurs, and the waiting time. is determined according to the detected rotation speed of the motor.
    [12]
    Inverter compressor according to claim 9, wherein the control unit comprises a detection unit which detects the pressure on the discharge side of the main body of the compressor when the inverter trip occurs, and the dwell time. Recovery time is determined according to the detected pressure.
    [13]
    The inverter compressor according to claim 9, wherein the control unit comprises memories which store at least two different types of different stimulus waiting times which are different from each other, and t 2 <t 1 is set where t2 indicates the restart wait time when the trip occurs immediately after the inverter is turned on and tl indicates the restart wait time when the trip occurs in normal operation of the inverter.
    [14]
    The inverter compressor according to claim 10, wherein the control unit comprises memories which store at least two different types of different stimulus waiting times which are different from each other, and t 2 <tl is set where t2 indicates the restart wait time when the trip occurs immediately after the inverter is turned on and tl indicates the restart wait time when the trip occurs in normal operation of the inverter.
    [15]
    15. Inverter compressor according to claim 11, wherein the control unit comprises memories which store at least two different types of different stimulus waiting times which are different from each other, and t2 <tl is set where t2 indicates the restart wait time when the trip occurs immediately after the inverter is turned on and tl indicates the restart wait time when the trip occurs in a normal • operation of the inverter .
    [16]
    16. Inverter compressor according to claim 12, wherein the control unit comprises memories which store at least two different types of different stimulus waiting times which are different from each other, and t2 <tl is set where t2 indicates the restart wait time when the trip occurs immediately after the inverter is turned on and tl indicates the restart wait time when the trip occurs in normal operation of the inverter.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP2008061422|2008-03-11|
    JP2008061422A|JP5203754B2|2008-03-11|2008-03-11|Inverter compressor control method and inverter compressor|
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