JP6234906B2 - Package type fluid machinery - Google Patents

Description

  The present invention relates to a packaged fluid machine in which a fluid machine main body that compresses, expands, or compresses a fluid and an electric motor that drives the fluid machine are housed in a housing, and more particularly, an external fan for cooling the electric motor is provided. Related packaged fluid machinery.

  In a package type fluid machine in which a fluid machine main body and a motor that drives the fluid machine main body are housed in a housing, an external fan for cooling the motor is often provided in order to stably operate the motor. When an external fan is provided, a fan cover that guides cooling air taken in by the external fan to an electric motor is generally provided. Conventionally, such a fan cover has been directly fixed to an electric motor using a bolt or the like as described in Patent Documents 1 and 2, for example.

JP 2000-50574 A JP 2012-184744 A

  As described above, when the fan cover is directly fixed to the electric motor, vibration generated in the fluid machine main body and the electric motor is easily propagated to the fan cover. Fan covers are often made of steel sheets with a thickness of about 1 to 3 mm for weight reduction. When the vibration of the fluid machine main body or electric motor propagates to the fan cover, the vibration is caused by resonance due to its thinness. It was easy to increase and became a big noise source.

  Accordingly, an object of the package type fluid machine according to the present invention is to reduce noise caused by the fan cover.

  In order to achieve the above object, a package type fluid machine according to the present invention includes a fluid machine main body that compresses, expands, or pumps fluid, an electric motor that drives the fluid machine main body, the fluid machine main body, and the electric motor inside. A housing to be accommodated, an outer fan fan that is provided on the opposite side of the output shaft of the electric motor and sends cooling air to the electric motor, covers the periphery of the outer fan fan, and the cooling air is supplied to the electric motor And the fan cover is fixed to the housing instead of the electric motor.

  According to the present invention, the fan cover is not fixed to the electric motor but fixed to the housing. Therefore, the vibration generated in the fluid machine main body and the electric motor does not directly propagate to the fan cover, so that the vibration of the fan cover is suppressed, and as a result, noise caused by the fan cover can be reduced.

It is sectional drawing which shows an example of embodiment of the package type compressor concerning this invention. It is a graph which shows the noise level in an Example and a comparative example. It is sectional drawing which shows other embodiment of a package type compressor.

  An embodiment of a package compressor as a package fluid machine according to the present invention will be described with reference to the drawings. In the following embodiments, a fluid machine main body provided with a compressor will be described as a fluid machine main body provided in a package type fluid machine, but the fluid machine main body is not limited to the compressor. That is, the fluid machine main body provided in the package type fluid machine of the present invention may be another device such as a blower, a pump, or an expander (expander) as long as it is a device that compresses, expands, or pumps fluid.

(overall structure)
FIG. 1 is a cross-sectional view showing an example of an embodiment of a package type compressor according to the present invention. The package-type compressor 1 mainly includes a rectangular parallelepiped casing 10, a compressor 20 accommodated in the casing 10, and an electric motor 30 that is also accommodated in the casing 10 and drives the compressor 20. It is provided and configured. Then, when the compressor 20 is driven by the electric motor 30, the air taken in from the outside of the apparatus is compressed by the compressor 20, and the compressed air can be supplied.

(Casing)
The housing 10 includes a housing body 11 that forms a side surface and a ceiling surface, and a base plate 12 that forms a bottom surface, and has a rectangular parallelepiped shape as a whole. In the present embodiment, the housing 10 has a partition wall 13 that extends from the base plate 12 to the ceiling surface of the housing body 11, and the internal space of the housing 10 is connected to the mounting chamber 14 by the partition wall 13. It is partitioned into an intake chamber 15.

  The mounting chamber 14 is a space for housing each device including the compressor 20 and the electric motor 30. Each device mounted in the mounting chamber 14 is mounted on the base plate 12 or fixed to an appropriate location of the housing 10 by an appropriate support member (not shown). The intake chamber 15 is a space for taking in air from the outside of the apparatus and supplying it to the mounting chamber 14. An intake port 11 a for introducing air from the outside of the apparatus to the intake chamber 15 is formed in the housing body 11. . In addition to the intake port 11a, the housing body 11 is formed with an exhaust port 11b for discharging cooling air used for cooling the electric motor 30 from the mounting chamber 14 to the outside of the apparatus.

(Electric motor)
The electric motor 30 has a configuration in which an output shaft 31 provided so as to rotate integrally with the mover rotates when the mover rotates relative to a stator (not shown). The output shaft 31 is connected to the input side of the connection box 50 having a plurality of gears 51 and 52, and the rotational output from the output shaft 31 is increased at the connection box 50. That is, in this embodiment, the speed increaser is provided as a transmission means for transmitting the power of the electric motor 30 inside the connection box 50, but such a transmission means is not limited to one having a speed change function, Coupling may be used. The output side of the connection box 50 is connected to the rotating shaft 21 of the compressor 20. Since the electric motor 30 generates heat during operation and the temperature rises, the electric motor 30 is cooled by an outer fan 41 described later in order to realize stable operation.

(Compressor)
The compressor 20 includes a rotating shaft 21 and an impeller 22 attached to the rotating shaft 21. As described above, the rotary shaft 21 of the compressor 20 is connected to the output shaft 31 of the electric motor 30 via the connection box 50, so that the rotational output from the output shaft 31 is increased to the rotary shaft 21. Communicated. As a result, the impeller 22 rotates at a high speed, and the air supplied from the intake chamber 15 is compressed by the compressor 20 to generate compressed air.

  The compressor 20 communicates with the intake chamber 15 via a pipe 71 and is connected to a cooler 60 that cools compressed air and a pipe 72. In addition, a pipe 73 extending to the outside of the housing 10 is connected to the cooler 60. That is, as indicated by solid arrows in FIG. 1, in order from the upstream side, the outside of the apparatus → the intake port 11a → the intake chamber 15 → the pipe 71 → the compressor 20 → the pipe 72 → the cooler 60 → the pipe 73 → the outside of the apparatus. Air flows into As a result, the air supplied from the intake chamber 15 is compressed by the compressor 20, then cooled by the cooler 60, and finally, the cooled compressed air can be supplied from the pipe 73.

(Outside fan)
The outer fan 41 is provided at the end of the output shaft 31 of the electric motor 30 on the counter-output side (opposite side of the compressor 20) and rotates integrally with the output shaft 31. When the external fan 41 rotates together with the output shaft 31, air is sucked from the intake chamber 15, and the sucked air is sent toward the electric motor 30. The air is air for cooling the electric motor 30 and is hereinafter referred to as “cooling air”.

(Fan cover)
The fan cover 42 is disposed so as to cover the periphery of the outer fan fan 41, and has a role of guiding the cooling air sucked from the intake chamber 15 by the outer fan fan 41 to the electric motor 30. The fan cover 42 has, for example, a truncated cone shape, and a plurality of through holes are formed on the surface on the intake chamber 15 side (right surface in FIG. 1) to form the air guide port 42a, and the opposite surface (in FIG. 1). The left surface is an opening surface 42b. When the external fan 41 rotates, the cooling air in the intake chamber 15 is sucked into the mounting chamber 14 via the air inlet 42a and flows to the electric motor 30 through the opening 42b. At this time, since the peripheral surface of the fan cover 42 has a tapered shape that increases in diameter toward the electric motor 30, the cooling air collides with the inner wall of the fan cover 42, and the flow line flows toward the electric motor 30. It is converted into the direction, and the cooling air can be reliably supplied to the electric motor 30.

  The fan cover 42 is not fixed to the electric motor 30 but is fixed to the partition wall 13. Specifically, the opening surface 42b is substantially flush with the partition wall 13, and the end of the fan cover 42 (periphery of the opening surface 42b) is formed on the partition wall 13 by a known method such as bolt fixing or welding. Directly fixed. However, it is not essential to directly fix the fan cover 42 to the partition wall 13, and the fan cover 42 may be fixed to the partition wall 13 via another member. Even when the outer fan fan 41 is located closer to the intake chamber 15 than the partition wall 13 as in the present embodiment, the outer fan fan 41 is integrated with the electric motor 30 in the mounting chamber 14. Since it is configured, it is considered that the external fan 41 is disposed in the mounting chamber 14.

(Cooling duct)
A cooling duct 43 is further provided for circulating the cooling air sent toward the electric motor 30 by the outer fan fan 41 along the outer surface of the electric motor 30. The cooling duct 43 is a cylindrical member having a diameter larger than that of the electric motor 30 and is arranged so as to cover the periphery of the electric motor 30. As a result, an annular space is formed between the electric motor 30 and the cooling duct 43, and cooling air flows along this outer space along the outer surface of the electric motor 30.

  The end of the cooling duct 43 on the side of the intake chamber 15 is joined to the end of the fan cover 42 by bolting or the like, and the cooling air taken into the fan cover 42 by the outer fan 41 is opened as it is. It passes through the surface 42b and flows along the outer surface of the electric motor 30. The end of the cooling duct 43 opposite to the intake chamber 15 is separated from the connection box 50 so as not to block the cooling air flow path. Then, after the cooling air flowing along the outer surface of the electric motor 30 exits from the cooling duct 43, each device is arranged so as to flow along the outer surface of the junction box 50 and the compressor 20.

  Like the fan cover 42, the cooling duct 43 is not fixed to the electric motor 30 but is fixed to the partition wall 13. Specifically, the end of the cooling duct 43 on the side of the intake chamber 15 is directly fixed to the partition wall 13 by a known method such as bolt fixing or welding. However, it is not essential to fix the cooling duct 43 directly to the partition wall 13, and the cooling duct 43 may be fixed to the partition wall 13 via another member.

(Flow of cooling air)
In the package type compressor 1 configured as described above, as indicated by the dashed arrows in FIG. 1, the cooling air is sequentially supplied from the upstream side to the outside of the apparatus → the intake port 11a → the intake chamber 15 → the air guide port. 42a → the inner space of the fan cover 42 → the opening surface 42b → the annular space between the motor 30 and the cooling duct 43 → the outside of the connection box 50 → the outside of the compressor 20 → the exhaust port 11b → the outside of the apparatus. In other words, not only the motor 30 but also the junction box 50 and the compressor 20 are provided in the flow path from the cooling fan sent to the motor 30 by the external fan 41 to the exhaust port 11b. Will be placed.

  More specifically, the junction box 50 and the compressor 20 are disposed between the electric motor 30 and the exhaust port 11b in the direction of blowing the cooling air by the outer fan 41 (the direction from right to left in FIG. 1). The cooling air used for cooling the electric motor 30 flows around the junction box 50 and the compressor 20 before reaching the exhaust port 11b. For this reason, the cooling air that has cooled the electric motor 30 is directed toward the exhaust port 11b while cooling the connection box 50 and the compressor 20 thereafter. That is, the connection box 50 and the compressor 20 can be cooled with the cooling air used for cooling the electric motor 30, and the connection box 50 and the compressor 20 can be efficiently cooled. Moreover, since the exhaust port 11b is located downstream of the compressor 20 in the air blowing direction, the cooling air flow path does not branch upstream of the compressor 20, and the cooling air can be supplied. It is possible to reliably supply not only the electric motor 30 but also the junction box 50 and the compressor 20. Moreover, in this embodiment, since the electric motor 30, the connection box 50, the compressor 20, and the exhaust port 11b are arranged in this order in the vertical direction in addition to the air blowing direction, the cooling is directed from the electric motor 30 toward the exhaust port 11b. Air is more likely to flow around the junction box 50 and the compressor 20.

(Reduction of noise leakage outside the equipment)
It is not an essential requirement to provide the housing 10 with the partition wall 13 and divide the interior of the housing 10 into the mounting chamber 14 and the intake chamber 15. However, if each device arranged inside the housing 10 generates a large noise, if the partition wall 13 is not provided, noise leaking outside the apparatus from the air inlet formed in the housing 10 becomes a problem. obtain. Therefore, in such a case, the partition wall 13 is provided and divided into the mounting chamber 14 and the intake chamber 15, so that noise from each device in the mounting chamber 14 is less likely to leak outside the apparatus. is there. In addition, in the present embodiment, since the cooling air is directly supplied to the electric motor 30 by the outer fan 41 from the intake chamber 15 where no equipment is provided, fresh cooling air is supplied. It can be supplied to the electric motor 30 and the cooling effect of the electric motor 30 can be improved. In other words, the partition wall 13 divides the mounting chamber 14 and the intake chamber 15, and further secures the flow of cooling air from the outside of the apparatus → the intake port 11a → the intake chamber 15 → the air guide port 42a → the external fan 41 The two problems of noise reduction and improvement of cooling effect are solved simultaneously.

  Further, in the present embodiment, in order to further enhance the noise reduction effect, the intake port 11a formed in the housing 10 and the air guide port 42a formed in the fan cover 42 are in a positional relationship where they cannot see each other. By doing so, the noise of each device leaked from the mounting chamber 14 to the intake chamber 15 through the air inlet 42a is attenuated by receiving a large diffraction effect when propagating to the intake port 11a. Noise that leaks to the outside can be further reduced.

  Note that noise generated in the mounting chamber 14 can leak out of the apparatus from the exhaust port 11b. Therefore, for example, a bent pipe may be connected to the exhaust port 11b, and the cooling air may be discharged from the exhaust port 11b to the outside of the apparatus via the bent pipe. By doing so, noise generated in the mounting chamber 14 is attenuated in the bent pipe, and noise leaking from the exhaust port 11b to the outside of the apparatus can be reduced.

(Noise reduction effect in the embodiment)
FIG. 2 is a graph showing noise levels in the example and the comparative example. In the embodiment, as shown in FIG. 1, the fan cover 42 and the cooling duct 43 are both fixed to the partition wall 13 (bolt fixing) and are not fixed to the electric motor 30. On the other hand, in the comparative example, both the fan cover 42 and the cooling duct 43 are fixed to the electric motor 30 (bolt fixing). The noise level is a value measured at a point 1 meter in front of the packaged compressor 1 (front side in FIG. 1).

  According to the results shown in FIG. 2, the noise level of the example is lower than that of the comparative example in almost all frequency regions, and in particular, in the region where the frequency is approximately 1000 Hz or more, the noise reduction effect of about 10 dB or more is achieved. It was seen. Thus, it was shown that the noise outside the apparatus can be effectively reduced by fixing the fan cover 42 and the cooling duct 43 to the partition wall 13 instead of the electric motor 30.

(effect)
As described above, according to the package compressor 1 of the present embodiment, the fan cover 42 is not fixed to the electric motor 30 but fixed to the housing 10 (partition wall 13). Therefore, the vibration generated in the compressor 20 and the electric motor 30 does not directly propagate to the fan cover 42, so that the vibration of the fan cover 42 is suppressed, and as a result, noise caused by the fan cover 42 can be reduced. .

  Further, in this embodiment, a cooling duct 43 is further provided to circulate cooling air along the outer surface of the electric motor 30. However, the cooling duct 43 is not fixed to the electric motor 30, and the housing 10 (partition wall 13). Therefore, vibration generated in the compressor 20 and the electric motor 30 does not directly propagate to the cooling duct 43, so that the vibration of the cooling duct 43 is suppressed, and as a result, noise caused by the cooling duct 43 is reduced. be able to.

(Other embodiments)
The present invention is not limited to the above embodiment, and the elements of the above embodiment can be appropriately combined or variously modified without departing from the spirit of the present invention.

  Here, a specific example of another embodiment will be described with reference to FIG. About the same component as the component shown in FIG. 1, description is abbreviate | omitted by attaching | subjecting the same code | symbol, and it demonstrates centering on a different point from the form of FIG.

  In the form shown in FIG. 3, the fan cover 42 is fixed to the partition wall 13, while the cooling duct 43 is fixed to the ceiling surface of the housing body 11 via the support member 44. Specifically, the fan cover 42 is directly fixed to the partition wall 13 by a known method such as bolt fixing or welding, with the surface on which the air guide opening 42 a is formed being substantially flush with the partition wall 13. The external fan 41 in the fan cover 42 is located in the mounting chamber 14. The cooling duct 43 is supported by two support members 44 suspended from the ceiling surface of the housing body 11.

  Thus, where and how the fan cover 42 and the cooling duct 43 are fixed in the housing 10 can be changed as appropriate. In the present invention, “fixed to the casing” means not only a form directly fixed to each part of the casing 10 (the casing main body 11, the base plate 12, and the partition wall 13), A mode of fixing indirectly through a member is also included.

  In the form shown in FIG. 3, a sound insulating plate 16 is provided in the intake chamber 15. Here, the sound insulating plate protrudes into the intake chamber 15 between the air inlet 11a and the air inlet 42a, more specifically, from the position between the air inlet 11a and the air inlet 42a in the height direction of the partition wall 13. By providing 16, the air intake port 11a formed in the housing 10 and the air guide port 42a formed in the fan cover 42 cannot be seen through each other. In this way, by providing the sound insulating plate 16 between the intake port 11a and the air guide port 42a so that they cannot see each other, noise of each device leaked from the mounting chamber 14 to the intake chamber 15 through the air guide port 42a. Further, leakage from the intake port 11a to the outside of the apparatus can be suppressed. Further, since the sound insulating plate 16 is used to prevent the intake port 11a and the air guide port 42a from seeing each other, restrictions on the arrangement of the intake port 11a and the air guide port 42a from the viewpoint of noise reduction are alleviated. , The degree of freedom of arrangement is improved. For this reason, for example, from the viewpoint of improving the supply efficiency of fresh cooling air, the arrangement of the intake port 11a and the air guide port 42a can be optimized, which is preferable. In FIG. 3, the air guide hole 42 a is formed in the fan cover 42, but the air guide hole may be formed in the partition wall 13 instead of the fan cover 42.

  In the above embodiment, air is compressed by the compressor 20, but the fluid to be compressed is not limited to air.

  In the above embodiment, the air intake port compressed by the compressor 20 and the air intake port for cooling air are the common intake port 11a. However, each intake port is provided separately, and the flow of the compression air The flow of cooling air may be completely separated.

  In the above embodiment, the cooling duct 43 is provided. However, the cooling duct 43 can be omitted. Needless to say, the specific shapes of the fan cover 42 and the cooling duct 43 may be changed.

  Further, if noise from each device in the housing 10 does not matter so much, the partition wall 13 may be eliminated and the fan cover 42 may be fixed to the side surface of the housing body 11, for example.

1 Package type compressor (Package type fluid machine)
DESCRIPTION OF SYMBOLS 10 Case 11a Intake port 11b Exhaust port 13 Partition wall 14 Mounting chamber 15 Intake chamber 20 Compressor (fluid machine main body)
30 Electric motor 31 Output shaft 41 Outer fan fan 42 Fan cover 42a Air duct 43 Cooling duct

Claims (6)

A fluid machine body for compressing, expanding or pumping fluid; and
An electric motor for driving the fluid machine body;
A housing that houses the fluid machine main body and the electric motor;
An external fan that is provided on the opposite side of the fluid machine body of the output shaft of the electric motor and sends cooling air to the electric motor;
A fan cover that covers the periphery of the outer fan and guides the cooling air to the electric motor;
A cooling duct that is arranged so as to cover the periphery of the electric motor and distributes the cooling air sent to the electric motor by the outer fan fan along the outer surface of the electric motor;
With
The fluid machine main body has an inner surface of the housing on the downstream side of the electric motor in the air blowing direction of the cooling air so that the cooling air exiting the cooling duct flows along the periphery of the fluid machine main body. Are arranged at intervals ,
The package type fluid machine is characterized in that the fan cover and the cooling duct are fixed to the casing with a space from the inner surface of the casing , not the electric motor. An intake port for introducing the cooling air from the outside of the device and an exhaust port for discharging the cooling air used for cooling the electric motor to the outside of the device are formed in the housing,
Further, the casing is a partition that divides an internal space of the casing into an intake chamber connected to the intake port and a mounting chamber connected to the exhaust port and housing the fluid machine main body and the electric motor. Have walls,
The package type fluid machine according to claim 1, wherein an air guide port for supplying the cooling air from the intake chamber to the outer fan is provided.   The package type fluid machine according to claim 2, wherein the fan cover is fixed to the partition wall.   The package type fluid machine according to claim 2 or 3, wherein the intake port and the air guide port cannot be seen from each other.   The package type fluid machine according to claim 4, wherein a sound insulating plate is disposed between the air intake port and the air guide port so that the air intake port and the air guide port cannot be seen through each other.   In the air blowing direction of the cooling air by the outer fan, the fluid machine main body is arranged between the electric motor and the exhaust port, and the cooling air used for cooling the electric motor is the exhaust gas The package type fluid machine according to any one of claims 2 to 5, wherein the package type fluid machine flows around the fluid machine main body before reaching the mouth.

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