• 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:
    The invention decreases the size and simplifies the structures of a compressor and its drive device and enables noise reduction. An oil-free screw compressor consists of the two main compressor parts (1, 2) intended to compress a gas, of an engine (10) driving the rotors of the main parts of the compressor via multiplier devices (2a, 2b, 9), a gearbox (3) enclosing the multiplier devices, cooling devices (31, 41) for cooling a discharge air and the like. An oil reservoir (72) is provided independently of the gearbox, the motor is attached to a common base (21), the gearbox is fully attached to the motor via a flange (5 ) and the main parts of the compressor are fully attached to the gearbox via a clamp. In addition, the cooling devices are arranged at an upper part of the driving device, and a fan (44) is installed at its upper part.
    公开号:BE1018643A3
    申请号:E2007/0357
    申请日:2007-07-19
    公开日:2011-06-07
    发明作者:Natsuki Kawabata；Hitoshi Nishimura；Yusuke Nagai
    申请人:Hitachi Ind Equipement Systems Co Ltd；
    IPC主号:
    专利说明:

    SCREW COMPRESSOR WITHOUT OIL
    Background of 1 # invention
    Field of the invention
    The present invention relates to an oil-free screw compressor comprising a compressor that compresses a gas, such as air or the like, a drive device that drives the compressor, a cooling device that cools the gas from the compressor and the like and which is particularly suitable for an oil-free screw compressor of the medium capacity type disposed in a cabinet, provided with a low pressure stage compressor and a high stage compressor.
    Description of the related art
    As an example of a medium-capacity conventional oil-free screw compressor, the structure described in document 1 (JP-A-2002-155879 (Fig. 1)) can be cited. In this conventional structure, a transmission shaft located in a gearbox and a motor shaft driving the transmission shaft are coupled by means of a coupling device. In addition, generally, the motor and the gearbox are both attached to a drive system attached to a special-purpose base designed for the drive system which is attached to a common base, and cooling devices. , such as an air-cooled chiller (an aftercooler, an internal cooler, an oil cooler or the like) and the like, are disposed on the rear surface of the main part of the compressor or a drive system ( an engine, a gearbox or the like). The cooler component of the cooling device is disposed to be exposed to a rear surface of a cabinet and is structured to introduce ambient air at a low temperature directly into the cooler, thereby reducing the size.
    In addition, according to a prior art described in document 2 (JP-A-11-141488 (FIGS 2-8), a structure is already known in which the internal cooler, the final cooler, the oil cooler or the like are arranged on a side that is isolated from the main part of the compressor and the drive system inside the cabinet, the motor and compressor are attached to the gearbox, and the gearbox is attached to the base.
    For each of the conventional oil-free screw compressors, since the structure is constructed in such a way that the gearbox and motor are attached using a coupling device and the motor and the gearbox both have the special-purpose base designed for the drive system, which is attached to and attached to the common base, it is difficult to regulate in such a way as to center the coupling and the length unity is increased. In addition, the disadvantage is that the special-purpose base designed for the drive system, the drive shaft, the propeller shaft support and the like are needed.
    Since the gearbox also has an oil reservoir function, the gearbox is enlarged, which is problematic because high costs are caused by the need for larger equipment. In addition, since the gearbox is large, it is known that it vibrates like a drum and is therefore a source of noise.
    Furthermore, in the oil-free screw compressor in the form of a cabinet or the like, since the structure is generally designed such that the device, such as the cooler or the like, composing the cooling device is exposed to the surface rear of the cabinet or directly in communication, the disadvantage is that a vibration noise or pulsation noise tends to be perceived at the outer surface of the cabinet from the surface of the cooling portion.
    Brief summary of the invention
    An object of the present invention is to provide an oil-free screw compressor that can reduce the size of a gearbox and improve the assembly characteristics of a compressor and a drive device. .
    Another object of the present invention is to provide an oil-free screw compressor which could achieve a low noise level.
    In addition, another object of the present invention is to provide an oil-less screw compressor capable of efficiently supplying cooling air to a cooling device.
    In order to achieve these objectives, according to a first aspect of the present invention, there is provided an oil-less screw compressor comprising: a compressor having a rotor and compressing a gas; a multiplier device connected to the rotor of the compressor; a gearbox that fits said multiplier device; and a motor driving the compressor rotor via the multiplier device, characterized in that an oil reservoir containing a lubricating oil for lubricating the multiplier device inside the gearbox is provided as a body independent of the gearbox, in that the motor is fixed to the base, in that the gearbox is fully fixed to the motor and in that the compressor is fully fixed to the gearbox.
    In this case, the structure can be designed in such a way that the gearbox is attached to the motor via a support flange, that the compressor is attached to the gearbox via a gearbox. a support flange, that the engine is provided with a base portion to be attached to the base and that the engine, gearbox and compressor are attached to the base by attaching the base portion to the base based.
    In addition, the structure may be designed so that the multiplier device has a speed reducer attached to a motor shaft of the motor and a pinion gear fixed on a rotor shaft of the compressor and cooperating with the speed reducer.
    In addition, it is preferable that the structure is designed so that a pedestal portion is provided in the gearbox, and that the gearbox is secured to the base through the provided pedestal portion. in the gearbox when the motor and the gearbox are independent of each other.
    The compressor can be applied to a structure made from two main compressor parts which comprise a low pressure stage compressor which passes the gas from a suction pressure to an intermediate pressure, and a high pressure stage compressor which shifts the gas from an intermediate pressure to a discharge pressure.
    This is preferable, in the context of maintenance, if the oil tank is installed on a base (common base) common with the base which fixes the engine, and if an oil dipstick is attached to the oil tank .
    According to a second aspect of the present invention, there is provided an oil-less screw compressor of the type disposed in a cabinet comprising: a low pressure stage compressor; a compressor with a high pressure stage; a gearbox having a multiplier device; a driving device for driving each of the main parts of the compressor through the multiplier device; a low pressure stage cooling device for cooling a compressor gas from the low pressure stage compressor; a high pressure stage cooling device for cooling a compressor gas from the high pressure stage compressor; a lubricating oil cooling device for cooling the lubricating oil which lubricates the multiplier device; and all of these devices being arranged in a cabinet, characterized in that the low pressure stage compressor, the high stage compressor and the drive device are integrated, in that the drive device is installed on a base which is common with a base for installing the other devices, in that at least one of the low pressure stage cooling device, the high pressure stage cooling device and the lubricating oil cooling device is disposed on an upper portion of the cabinet, in that a supply duct sucking the ambient air is disposed on a lateral surface of the cabinet and in that the supply duct supports at least one end of the cooling device disposed on the portion upper case.
    In this case, the structure may be designed such that the oil reservoir containing the lubricating oil for lubricating the multiplier device within said gearbox is provided as an independent part of the gear box. the gears and that the oil reservoir is installed on the common base for securing the drive.
    In addition, it is preferable that the structure is designed such that the low pressure stage cooling device, the high stage cooling device and the lubricating oil cooling device are arranged in the upper portion of the enclosure. the low pressure stage cooling system is disposed in an upper portion adjacent to the low pressure stage compressor, the high stage stage cooling device is disposed in an upper portion adjacent to the high stage compressor. that a cooling air for cooling the low temperature side of said cooling apparatus reaches a temperature lower than that of the cooling air for cooling the high temperature side in any of the cooling devices.
    In this case, the structure may be designed such that at least one of the low pressure stage cooler, the high stage cooler, and the lubricant oil cooler is disposed so that to be slightly inclined relative to said common base.
    If the structure is designed such that the supply duct is provided with an air supply opening, formed in a lower portion of an external lateral surface and putting the ambient air in communication with the inner wall of the duct and an air outlet orifice formed in an upper portion of an inner lateral surface of the duct and passing the air introduced into the duct of the air supply orifice towards a wall the air inlet port and the air outlet orifice are arranged so as not to overlap on a horizontal plane, it is possible to reduce the noise loss from the cabinet towards the outside of the box.
    In addition, if the structure is designed such that a starting platform from which the drive device starts and a dryer for removing water present in the compression gas is installed on the inside the cabinet, the driving device is arranged to be sandwiched between the starting platform and the dryer and the ambient air, introduced into the cabinet from a lateral surface of the case, cools the drive device as it passes through a portion that is between the starting platform and the dryer, an effect is obtained which sufficiently cool the drive device and it is also possible to make the cabinet compact in its entirety.
    According to the present invention, since the structure is designed such that the gearbox is fully attached to the engine, it is possible to improve the assembly characteristics of the drive device which drives the compressor. More particularly, since the speed reducer of the multiplier device is directly attached to the motor shaft, no coupling is necessary and the assembly characteristics are improved.
    In addition, since the oil reservoir containing the lubricating oil for lubricating the multiplier device is designed as an independent part of the gearbox, it is not necessary to keep the lubricating oil inside. of the gearbox and it is thus possible to greatly reduce the size of the gearbox. As a result, it is possible to fully attach the gearbox to the motor, it is sufficient to attach the motor to the base only by fully attaching the compressor to the gearbox and it is not necessary to attach the gearbox to the gearbox. gear box at the base since it is different from the conventional structure.
    In addition, since the size of the gearbox can be greatly reduced, it is possible to prevent the gearbox from deforming like a drum and it is possible to reduce the noise.
    Furthermore, since the structure is designed so that the cooler (cooling device) is arranged on the upper portion of the cabinet, preferably more or less parallel to the base, it is possible to reduce the noise loss from the cooling portion in a horizontal plane, compared to what happens when the cooler is provided on the side surface of the cabinet. In addition, since the structure is designed such that the supply duct sucking the ambient air is disposed on a side surface of the cabinet and that the supply duct supports at least one end of the cooling device disposed on the upper portion of the cabinet, the structure is simplified and an effect is obtained by which it is possible to reduce the noise loss at the outer portion by the supply duct while effectively providing the cooling air to the device of cooling.
    The features of the best embodiment according to the present invention are described below.
    The compressor is structured as a two-stage screw compressor comprising a low pressure stage compressor and a high stage compressor which compresses the gas, such as air or the like, by rotating the screw rotor. In addition, the driving device consists of the motor (driving device) which serves as a power source for the compressor which performs the compression work, the multiplier device which increases the speed of rotation of the motor so as to transmit the movement rotation of the compressor rotor, the gearbox which contains the multiplier device and the like.
    In the training device mentioned above, the structure is designed in such a way that the size of the gearbox is decreased by making the oil reservoir independent of the gearbox, which the motor is attached to. the common base of the compression unit, that the gearbox is connected to the motor via the flange, and that the compressor is connected to the gearbox via the flange. According to this structure, it is possible to dispense with the coupling of the motor and the multiplier device. Consequently, it is possible to directly attach the multiplier device to the motor shaft and it is possible to dispense with the transmission shaft and the support of the conventional structure. In addition, an oil dipstick is provided in the oil reservoir which is separate from the gearbox. Since it is necessary to detach the engine at the time of engine maintenance, the pedestal portion is provided in the gearbox, and the structure is designed so that the gearbox itself can be attached directly to the common base.
    In the upper portion of the compressor within the compressor unit and the compressor drive system, the low pressure stage cooler (internal cooler) which cools a gas, such as air or the like. discharged by the low pressure stage compressor and discharging heat out of the device, the high pressure stage cooling device (final cooler) which cools a gas, such as air or the like, discharged from the end of the air compressor of the high pressure stage compressor and which discharges heat out of the device, and the oil cooling device (oil cooler) for cooling the lubricating oil of the multiplier device or the like, are disposed of such that they are parallel to the common base in the base portion for fixing the motor, or that they are inclined.
    The following effects can be achieved by employing the structure mentioned above.
    Since the compressor and the driving device are integrated, it is possible to reduce the size, it is possible to reduce the place of installation of the drive device and it is possible to improve the design freedom of the cooler , pump or the like installed inside the unit. In addition, since the coupling of the motor and the transmission shaft is no longer necessary, it is possible to dispense with the centering step and since the support of the drive shaft is not necessary. no longer necessary, it is easy to carry out maintenance. In addition, the special-purpose base designed for the drive device is no longer needed when incorporating the compressor and the drive, the special-purpose base being necessary in the prior art.
    Since the structure is designed so that the pedestal portion is present in the gearbox, and the gearbox is itself attached to the common base, it is possible to perform the engine maintenance. independently.
    Since the oil reservoir is designed independently of the gearbox, the size of the gearbox is decreased and becomes cost-effective, and when it is formed by casting, it is possible to improve the rates of return on the basis of improved casting characteristics, and prevent the gearbox from deforming like a drum which generates a significant source of noise. In addition, since the dipstick is attached to the oil reservoir, which is designed independently of the gearbox, it is easily possible to place the dipstick in a location that allows easy control by the compressor manager and the maintenance manager.
    Since each of the coolers is disposed on the upper part inside the unit, the structure can be designed in such a way that the cooler is not exposed to the ambient air, and it is possible to reduce the noise loss from the chiller portion. In addition, since the structure is designed so that the cooling air for cooling the low temperature side of the cooling apparatus reaches a temperature lower than that of the cooling air for cooling the high side. temperature, in at least each of the cooling devices, it is possible to achieve a sufficient heat exchange. For example, the structure is designed to directly introduce the cooling air characterized by a higher temperature after it has cooled the motor at the inlet (high temperature side) of the compression gas in the high-stage cooling device and the low-pressure stage cooling device, and directly introducing the cooling air, taken from the ambient air having a lower temperature, via the feed pipe to the level of the outlet (low temperature side) of the compression gas. In addition, since the low-stage cooling device is disposed adjacent to the low-pressure stage compressor and the high-stage cooling device is disposed adjacent to the high-stage compressor, it is possible to shorten the conduits. which connect the compressor and the cooling device, and it is possible to achieve a simplification of the duct system.
    When each of the coolers is inclined relative to the common base in the base portion of the compression unit rather than parallel, it is possible to perform the most efficient heat exchange. In addition, since one end of each of the chillers is supported by the supply duct, it is possible to reduce the support structure for supporting the chiller.
    Other objects, features and advantages of the present invention will flow from the following description, in connection with the accompanying drawings, illustrating embodiments of the invention.
    Brief description of the various drawings
    Fig. 1 is a view of the system which explains the entire structure of an oil-free screw compressor illustrating an exemplary embodiment according to the present invention;
    Fig. 2 is a front elevational view illustrating an exemplary embodiment of a compressor and a drive system according to the present invention;
    Fig. 3 is a general view illustrating an embodiment of a structure of an oil-free screw compressor according to the present invention.
    Detailed description of the invention
    A description of an exemplary embodiment of the present invention, based on the accompanying drawings, is given below.
    Example 1
    Fig. 1 is a view of the system which illustrates the entire structure of an oil-free screw compressor according to the present embodiment and which illustrates an exemplary application of the present invention to a cooled two-stage oil-less screw compressor. by the air.
    The air-cooled two-stage oil-free screw compressor is provided with a low-pressure stage compressor 1 and a high-stage compressor 2, and these compressor main parts 1 and 2 are attached to a shaft motor 10a of a motor 10. A gearbox 3 is provided with a speed reducer 9 attached to the front end of the motor shaft 10a, and pinion gears 1b and 2b attached to the ends. before the rotation shafts 1a and 2a of the main parts 1 and 2 of the compressor and engaging in the speed reducer 9. When the motor 10 is rotating, its rotation force is transmitted to the main parts 1 and 2 of the compressor through the speed reducer 9 and gear gears lb and 2b so as to rotate the main parts 1 and 2 of the compressor and to compress the air for compression.
    An internal cooler (a low pressure stage cooler) 31 is connected to a discharge side of the low pressure stage compressor 1 via a low pressure stage flow conduit 24, and the cooler internal 31 is connected to a supply side of the high-pressure stage compressor 2 via a high-stage flow conduit 25. In addition, a final cooler (a high-stage stage cooling device) 41 is connected to a discharge side of the high-pressure stage compressor 2 via a high-pressure stage flow conduit 26 and a control valve 27. Cooling air is supplied to the internal cooler 31 and the final cooler 41 by a fan 44, connected to a fan motor 34, which cools a compressed air, this compression being obtained thanks to the compressor with low pressure stage 1 and the compressor high pressure stage 2 so as to obtain a high temperature. An oil cooler (a lubricating oil cooler) 51 cools a lubricating oil that is circulated by an oil pump 53 and lubricates a gear and a carrier.
    According to the present invention, the size of the gearbox is decreased by making the oil reservoir 72 independent so as to be separated from the gearbox 3, and the gearbox 3 is connected to the engine 10 by through a flange. The speed reducer 9 is attached to the motor shaft 10a of the motor 10, and the motor 10 is rotated. Therefore, its rotational force is transmitted to the main parts 1 and 2 of the compressor via the speed reducer 9 and pinion gears 1b and 2b, and the air is compressed by rotating the main parts of the compressor. compressor.
    Fig. 2 is a front elevational view illustrating an exemplary embodiment according to the present invention describing a structure of the compressor and its drive system. Conventionally, the motor 10 is attached to a transmission shaft by means of a coupling device, and the main parts of the low pressure stage and high pressure stage compressor are connected to the gearbox 3 by means of a coupling device. through a flange. In addition, the structure is traditionally designed such that the motor 10 and the gearbox 3 are attached to the special-purpose base designed for the drive system, and this special-purpose base designed for the drive system. The drive is attached to the common base 21 by generally installing the other devices via a vibration-resistant rubber. In this case, the gearbox is also equipped with an oil dipstick that allows you to observe the amount of oil.
    On the other hand, according to the present example of embodiment, since the oil reservoir 72 (see Fig. 1) is designed independently, as shown in FIG. 2, it is possible to reduce the size of the gearbox 3, this gearbox 3 being connected and fixed to the motor 10 itself fixed to the common base 21 via the base portion 10b, 5. In addition, the main parts 1 and 2 of the compressor (see Fig. 1 at the high-pressure stage compressor 2) are connected to and fixed to the gearbox 3 by the 5. In this case, the pedestal portion 3a is provided in the gearbox 3 in such a way that it is possible to disconnect the gearbox 3 from the engine 10 at the time of maintenance. this motor 10. Similarly, since the motor can be fixed independently to the common base 21, it is possible to easily perform maintenance.
    According to the embodiment mentioned above, since it is not necessary to fix the gearbox 3 to the common base 21, and that it suffices to fix the compressor and its device. driving to the common base 21 only using the base portion 10b of the engine, it is not necessary to use the special-purpose base designed for the drive system because of its difference with the conventional structure, and it is possible to simplify the structure. In this case, the base portion 10b of the motor can be installed in the common base 21 by means of a vibration-resistant rubber. In addition, according to the present embodiment, since the coupling is no longer necessary because of its difference with the conventional structure, it is not necessary to carry out the regulation, as in the case where the coupling, and it is possible to greatly improve productivity and maintenance characteristics. In addition, since the speed reducer 9 (see Fig. 1) is directly attached to the motor shaft (transmission shaft) 10a, the transmission shaft and the carrier for supporting the drive shaft are more necessary because of their difference with the conventional structure. In addition, since the compressor and its drive system are integrated and their size is decreased, it is possible to increase the freedom of arrangement of the parts such as the internal cooler 31, the aftercooler 41 and the like.
    Moreover, since the size of the gearbox 3 can be reduced compared to the prior art, it is possible to reduce costs, to improve productivity on the basis of the improvement in the rate of return and to reduce the noise caused by the vibration of the surface of the gearbox 3A.
    Fig. 3 is an overall view of the entire unit of the compressor according to the present embodiment.
    Conventionally, the internal cooler 31, the aftercooler 41 and the oil cooler 51, shown in FIG. 1, are arranged on a rear surface of the compression unit, and the structure is designed such that the cooling air from each of the coolers is sucked as it passes through each of the coolers 31, 41 and 51 from an outer portion of the cabinet, and is discharged at the outer portion from an upper portion of the cabinet, by a fan provided above the unit. Since the structure is generally designed in such a way that the cooling air passage surface is exposed to the outer portion of the cabinet so as to decrease the pressure loss and to introduce into each of the chillers the air With the cooling of the temperature as low as possible, the noise from the inner wall of the unit tends to leak at the outer portion, which causes a disadvantage. In addition, when each of the coolers 31, 41 and 51 are arranged on the rear surface of the box, as in the prior art, the distance between the low pressure stage compressor 1 and the internal cooler is lengthened. 31 as well as the distance between the high-pressure compressor 2 and the final cooler 41, so that not only the structure of. Flow gas duct is complicated but the ducts (for example, ducts 24, 25 and 26 in Fig. 1) are also very expensive because they are made of stainless steel.
    In contrast, according to the present embodiment, the final cooler 31, the internal cooler 41 and the oil cooler 51 are arranged above the main parts 1 and 2 of the compressor, its drive device 10 and the like. are more or less parallel to the common base 21. According to the present embodiment, since each of the coolers 31, 41 and 51 are placed under the fan 44, it is possible to place each of the coolers in a lid ( not shown) which covers the outer part of the compression unit of the type arranged in a box, via a space. Similarly, each of the coolers can be structured so as not to be exposed to the outer portion and it is possible to reduce the noise from the compression unit of the type disposed in a cabinet, removing the noise that leaks from the inner portion of the unit.
    In addition, according to the present embodiment, the final cooler 31, the internal cooler 41 and the oil cooler 51 are arranged and structured so that the cooling air, which cools the low temperature side of the cooling devices, reach a temperature that is lower than that of the cooling air that cools the high temperature side. In other words, since the structure is designed to directly introduce the cooling air (e.g., about 40 ° C) having in comparison a high temperature after it has cooled the engine to the level of the engine. supply port (the high temperature side: for example, wherein the compression gas flow is at about 180 ° C) of the compression gas in the high pressure stage cooling device and the low stage cooling device pressure, and to directly introduce the ambient air (the cooling air: for example, at about 25 ° C) taken through the supply duct to the flow side (the low temperature side: for example at which the compression gas cools at about 55 ° C) of the compression gas, it is possible to improve the cooling efficiency and it is possible to obtain a structure which does not exhibit noise leakage from the wall internal unit. In addition, since the design of the chillers is structured so as to have the internal cooler 31 in the upper portion of the compressor (the low-pressure stage compressor) 1 on the front surface of the unit, and so as to arrange the final cooler 41 in the upper portion of the compressor (the high stage compressor) 2 on the rear surface of the unit, the piping between the air end of the compressor and the cooler is greatly reduced compared to the conventional structure .
    The oil reservoir 72 is placed on the common base 21 independently so as to be separated from the gearbox 3 and an oil dipstick 71 (reference to Fig. 1) is attached to the oil reservoir. 72. Since the oil reservoir 72 is separate from the drive device and can be placed freely, it is possible to place the dipstick 71 in a place easily visible at the time of maintenance.
    Furthermore, according to the present embodiment, a supply duct 73 is provided on one of the surfaces of the unit and an air outlet orifice 73a and an air outlet orifice 73b are respectively provided for in FIG. level of a lower portion of an outer wall of the supply duct 73 and at an upper portion of its inner wall, thereby introducing the ambient air at the inner wall of the unit via In this case, the structure may be designed so as to have at least one (or all) internal cooler (the low-stage cooling device) 31, the final cooler (the device high-stage cooling unit) 41 and oil cooler (the cooling device for the lubricating oil) 51 inclined with respect to the common base 21.
    In addition, according to the present embodiment, the structure is designed such that an end end of one of the coolers 31, 41 and 51 is fixed to the frame of the supply duct 73, thereby reducing the number of elements. In addition, the structure is designed such that a starting platform 75 for starting the engine (driving device) 10 and a dryer 76 for removing the water present in the compression gas. are installed on the common base 21 inside the box, so that the motor is sandwiched between the starting platform 75 and the dryer 76, and in such a way that the ambient air introduced into the box from a side surface of this cabinet cools the motor as it passes through a portion between the starting platform and the dryer. In this case, the reference numeral 74 designates a feed filter which filters the air (the gas) sucked up at the low pressure stage compressor 1.
    As mentioned above, according to the present embodiment, it is possible to obtain a compression unit of the type arranged in a box, which makes it possible to reduce the number of elements, which improves the working properties and the workability. which reduces costs and reduces noise.
    It should be understood by those skilled in the art that the invention is not limited to the foregoing description although it has been made on the basis of exemplary embodiments of this invention and that various changes and modifications can be made without it. depart from the spirit of this invention and the scope of the appended claims.
    权利要求:
    Claims (12)
    [1]
    An oil-less screw compressor comprising: a compressor having a rotor and compressing a gas; a multiplier device connected to the rotor of the compressor; a gearbox that fits said multiplier device; and a motor driving the compressor rotor via said multiplier device, characterized in that an oil reservoir containing a lubricating oil for lubricating the multiplier device inside the gearbox is provided as a body independent of said gearbox, in that said motor is fixed to the base, the gearbox is fully attached to said motor and the compressor is fully attached to said gearbox.
    [2]
    An oil-free screw compressor according to claim 1, characterized in that said gearbox is attached to said motor with a support flange, the compressor is attached to said gearbox using a support flange, said motor is provided with a base portion for attachment to said base and the motor, gearbox and air end of the compressor are attached to the base by attachment of the pedestal portion at the base.
    [3]
    An oil-free screw compressor according to claim 1 or 2, characterized in that the multiplier device has a speed reducer attached to a motor shaft of said motor and a pinion gear attached to a motor shaft of the compressor and cooperating with the speed reducer.
    [4]
    An oil-free screw compressor according to one of claims 1 to 3, characterized in that a pedestal portion is provided in said gearbox, and that the gearbox is attached to the base by via the pedestal portion provided in the gearbox when said motor and said gearbox are separated.
    [5]
    5. Oil-free screw compressor according to one of claims 1 to 4, characterized in that said compressor consists of two main compressor parts which comprise a low-pressure compressor which passes the gas of a pressure of suction at an intermediate pressure, and a high pressure stage compressor which passes gas from an intermediate pressure to a discharge pressure.
    [6]
    6. oil-free screw compressor according to one of claims 1 to 5, characterized in that said oil reservoir is installed on a common base with the base which fixes the engine, and in that a dipstick is attached to the oil tank.
    [7]
    7. Oil-free screw compressor, of the type arranged in a cabinet, comprising: a compressor with a low pressure stage; a compressor with a high pressure stage; a gearbox having a multiplier device; a driving device for driving said main parts of the compressor through said multiplier device; a low pressure stage cooling device for cooling a compressor gas from the low pressure stage compressor; a high pressure stage cooling device for cooling a compressor gas from the high pressure stage compressor; a lubricating oil cooling device for cooling the lubricating oil which lubricates said multiplier device; and all of these devices being arranged in a cabinet, characterized in that the low pressure stage compressor, the high pressure stage compressor and the driving device are integrated, the driving device is installed on a base which is common with a base for installing the other devices, at least one of said low-stage cooling device, high-stage cooling device and lubricating oil cooling device is disposed on an upper portion of the cabinet, in that a supply duct sucking ambient air is disposed on a lateral surface of the cabinet and in that the supply duct supports at least one end of said cooling device disposed on the upper portion of the cabinet.
    [8]
    An oil-free screw compressor according to claim 7, characterized in that an oil reservoir containing a lubricating oil for lubricating the multiplier device within said gearbox is provided as an independent part of said gearbox and that said oil reservoir is installed on the common base for securing the driving apparatus.
    [9]
    Oil-free screw compressor according to claim 7, characterized in that said low-pressure stage cooling device, the high-pressure stage cooling device and the lubricating oil cooling device are arranged in an upper portion of said a cabinet, said low-pressure stage cooling device is disposed in an upper portion which is adjacent to said low-pressure stage compressor, said high-stage cooling device is disposed in an upper portion which is adjacent to said high-pressure stage compressor, a cooling air for cooling the low temperature side of said cooling device reaches a temperature lower than that of the cooling air for cooling the high temperature side in any of said cooling devices.
    [10]
    10. oil-free screw compressor according to claim 9, characterized in that at least one of said low-pressure stage cooling devices, high-stage cooling device and cooling device of the lubricating oil is disposed of to be slightly inclined relative to said common base.
    [11]
    Oil-free screw compressor according to claim 7, characterized in that said supply duct is provided with an air supply orifice, formed in a lower portion of an external lateral surface and putting the air ambient in communication with the inner wall of the conduit and an air outlet, formed in an upper portion of an inner side surface of the conduit and passing air introduced into the conduit of said air supply port to an inner wall of the cabinet, said air supply port and said air outlet port being arranged so as not to overlap on a horizontal plane.
    [12]
    12. oil-free screw compressor according to claim 7, characterized in that a starting platform from which said drive device starts, and a dryer for removing the water present in the compression gas are installed on said base inside said box, said drive device is arranged to be sandwiched between said starting platform and the dryer, and the ambient air introduced into the box from a lateral surface of said cabinet cools said drive device as it passes through a portion between said starting platform and the dryer.
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    同族专利:
    公开号 | 公开日
    US20080050257A1|2008-02-28|
    US7708538B2|2010-05-04|
    JP4741992B2|2011-08-10|
    CN101109382A|2008-01-23|
    JP2008025389A|2008-02-07|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP2006196410|2006-07-19|
    JP2006196410A|JP4741992B2|2006-07-19|2006-07-19|Oil-free screw compressor|
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