JP2004176699A - Motor integral type compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor integral type compressor capable of preventing intrusion of a lubricating oil and dust into a motor chamber and hardly receiving respective thermal influence of a compressor body and a motor. <P>SOLUTION: A shaft sealing device 33 preventing the lubricating oil lubricating a bearing of the compressor body 2 from leaking onto a motor side and a shaft sealing cover 37 fixing the shaft sealing device are arranged on the motor side of the bearing 16 supporting a driving shaft 14 on the driving shaft 14 of the compressor body 2. A communicating hole 55 communicating the inside of a power side housing with its outside is formed in the power side housing 31 extending from the compressor body 2. A partition plate 57 connecting an inner peripheral face of the power side housing 31 with the shaft sealing cover 37 to partition the inside of a motor casing 53 and the inside of the power side housing 31 is provided at a position on the motor side of the communicating hole 55. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor-integrated compressor in which a compressor body and a motor are integrally formed.
[0002]
[Prior art]
A conventional oil-cooled screw compressor will be described with reference to FIGS.
[0003]
In FIG. 5, reference numeral 61 denotes a screw compressor main body (hereinafter referred to as a “compressor main body”). A pair of male and female screw rotors (hereinafter referred to as “rotors”) is provided in a rotor chamber 64 formed in a cylinder 63 of the compressor main body. ) 65 and 66 are accommodated. A suction side casing 67 having a suction port 68 and a suction passage 69 is connected to one side of the rotor chamber 64 in the axial direction, and a discharge port 72 and a discharge passage (not shown) are connected to the other side of the rotor chamber 64 in the axial direction. The discharge-side casing 71 in which is formed) is connected. The shaft portions 76, 77, 78, 79 extending at the end portions of the rotors are supported by bearings 81, 82, 83, 84 accommodated in the suction side casing 67 and the discharge side casing 71. Yes.
[0004]
In FIG. 4, the suction port 68 of the compressor body 61 is connected to a suction filter 86 and a compressed gas supply path 87 via a suction pipe 85, and the discharge port 72 is connected to an oil separation tank 62 and a compression pipe 88 via a discharge pipe 88. Connect to the consumption side piping 89 on the consumption side. The oil separation tank 62 stores lubricating oil O in the lower part, and the lower part of the oil separation tank 62 and the inside of the rotor chamber 64 of the compressor body 61 are connected by an oil pipe 92 via an oil cooler 90 and an oil filter 91. ing.
[0005]
The compressor main body 61 is driven by a prime mover such as a motor 95, and the rotor 65, 66 engages and rotates to suck compressed gas from the suction port 68 of the compressor main body 61 and compress it in the rotor chamber 64. In this compression process, the lubricating oil O stored in the oil separation tank 62 is supplied into the rotor chamber 64 for cooling of the compressed gas, lubrication and sealing between the rotors, and the compressed gas and the gas-liquid of the lubricating oil are supplied from the discharge port 72. The mixed gas is discharged into the oil separation tank 62. In the oil separation tank 62, gas in a gas-liquid mixed state collides with the side wall in the tank to primarily separate into compressed gas and lubricating oil, and the compressed gas is connected to the upper portion of the oil separation tank 62. The mist-like lubricating oil contained in the compressed gas is removed by 93 and only the compressed gas is supplied to the consuming side, while the lubricating oil is stored in the lower part in the oil separation tank 62. In addition, there exists what integrated the shaft part 76 of the rotor of the said compressor main body 61 with the axis | shaft of the motor 95 (refer patent document 1).
[0006]
Prior art document information of the present invention includes the following.
Japanese Patent Laid-Open No. 11-351168 (page 2-3, FIG. 1 to FIG. 2).
[0007]
[Problems to be solved by the invention]
In order to reduce the overall length of the compressor main body and the motor as compared with the conventional compressor, there is a motor-integrated compressor in which the compressor main body and the motor are integrated. In this motor-integrated compressor, if the lubricating oil leaks from the compressor main body to the motor side, the lubricating oil may carbonize in the motor chamber and cause a dielectric breakdown of the motor rotor. In addition, during operation, the temperature of the compressor rises due to the effect of heat on the compressor body, or the temperature of the compressor body rises due to the influence of heat due to the temperature rise of the motor. It is necessary to cool the compressor body and the motor.
[0008]
For this reason, it is conceivable that the motor chamber that houses the rotor and stator of the motor communicates with the atmosphere, and the hot air trapped in the motor chamber is released to the atmosphere for cooling, but if the motor chamber is opened to the atmosphere, There is a problem that dust or the like floating in the air enters the motor chamber.
[0009]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a motor-integrated compressor that prevents intrusion of lubricating oil and dust into the motor chamber and is less susceptible to the thermal effects of the compressor body and the motor.
[0010]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention is configured such that the drive shaft 14 of the compressor body 2 and the rotating shaft of the motor 4 are directly connected or integrally formed, and the power side housing 31 extending from the compressor body 2 and the motor 4 are integrated. In the motor-integrated compressor, the motor casing 53 for fixing the stator 52 is fixed, and the bearing 16 for supporting the drive shaft 14 of the compressor body 2 also serves as the bearing for supporting the rotating shaft of the motor 4. On the motor side of the bearing 16 that supports the drive shaft 14 on the drive shaft 14 of the main body 2, a shaft seal device 33 that prevents the lubricating oil that lubricated the bearings of the compressor main body 2 from leaking to the motor side, and A shaft seal cover 37 for fixing the shaft seal device is provided, and a communication hole 55 is formed in the power side housing 31 extending from the compressor body 2 so as to communicate the inside and outside of the power side housing 31. In the partition plate 57 to the cover the power side housing 31 is provided, characterized in that each isolating seal the inside motor casing 53 and the power side housing 31. (Claim 1).
[0011]
The partition plate includes, for example, a flange portion 56 that bulges from the inner peripheral surface of the power side housing 31 toward the rotor shaft (14) at a position of the communication hole 55 on the motor side, and a motor of the shaft seal cover 37. It is fixed to the side end wall surface, and both members can be connected and arranged (Claim 2). Further, the present invention provides a shaft sealing device 33 as a device that effectively prevents a very small amount of drain (lubricant) leaking from the shaft sealing device 33 from entering the motor casing 53 through the rotor shaft 14. The drain collecting passage 28 and the partition plate having one end fixed to an insertion hole formed in the shaft seal cover 37 and the other end facing the outside through a communication hole 55 communicating with the inside and outside of the power side housing 31. 57, and a seal 29 provided between them (Claim 3). Further, with respect to the shaft seal cover 37, the inner space 32 of the power side housing 31, the inner periphery of the shaft seal cover 37, and the rotor shaft on the motor casing 53 side between the drain collection passage 28 and the partition plate 57. A through hole 30 that communicates a minute gap between the outer circumferences can be formed. Further, the through hole 30 can be formed between the seal 29 and the partition plate 57 (Claim 4).
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment will be described with reference to FIGS.
[0013]
1 and 2, the oil-cooled screw compressor 1 accommodates a pair of male and female screw rotors 6 and 7 in a rotor chamber 9 of a cylinder 8 so as to be able to mesh and rotate, and the pair of screw rotors 6 and 7 rotate. In the process of compressing the gas to be compressed, the oil-cooled compressor main body 2 for injecting the lubricating oil as a cooling medium into the rotor chamber 9 and the rotor chamber 9 of the compressor main body 2 are compressed and discharged. A gas-liquid separator 3 that introduces a gas-liquid mixed fluid of compressed gas and lubricating oil, separates the compressed gas and lubricating oil and supplies the compressed gas to the consumption side, and a motor 4 that rotationally drives the compressor main body 2. And are united together.
[0014]
The compressor body 2 has a suction port 12 and a suction passage 13 for sucking compressed gas on one side of the cylinder 8 with respect to the axial direction of the screw rotors 6, 7. A suction-side casing 11 that houses bearings 16 and 17 that support the one-side rotor shafts 14 and 15, and a discharge port 22 that discharges compressed gas to the other side of the cylinder 8 with respect to the axial direction of the screw rotors 6 and 7. And a discharge-side casing 21 that accommodates bearings 26 and 27 that form the discharge passages 23 and support the other rotor shafts 24 and 25 of the screw rotors 6 and 7, and the suction-side casing 11 and the cylinder 8. The suction rotor shaft 14 of the male rotor 6 penetrates the suction casing 11 and protrudes outside the compressor body 2 to serve as a drive shaft for the compressor body. Protrudes from the outer periphery of the inlet-side casing 11 to the outside of the compressor body 2, extending the power side housing 31 for coupling to the motor 4 integrally around the suction side rotor shaft 14 of the male rotor 6.
[0015]
A bearing 16 for supporting the suction side rotor shaft 14 of the male rotor 6 is housed in a bearing chamber 18 formed in the suction side casing 11, and the rotor shaft is accommodated in the bearing chamber 18 on the shaft of the suction side rotor shaft 14. A mechanical seal 33 that is a shaft seal device for preventing the lubricating oil in the bearing chamber 18 from leaking out of the compressor body 2 is provided on the outer side of the bearing 16 that supports the outer side of the mechanical seal 33. A shaft seal cover 37 for closing the bearing chamber 18 and fixing the mechanical seal is provided.
[0016]
The gas-liquid separator 3 introduces a receiver tank 41 that primarily separates the gas-liquid mixed fluid discharged from the compressor body 2 and a gas-liquid mixed fluid primarily separated in the receiver tank 41 to provide fine lubrication. A separator 42 for separating oil and supplying compressed gas to the consumption side; a connection port 43 for connecting the separator 42 to the receiver tank 41; and an inspection port 44 for inspecting and cleaning the interior of the receiver tank 41; The discharge side casing 21 of the compressor main body is inserted into the receiver tank 41 through the inspection port, and the flange portion 47 formed at the connection portion of the cylinder 8 with the discharge side casing 21 is used to fix the receiver tank 41. As will be described later, the compressor main body 2 to which the motor casing 4 is fixed is connected to the receiver tank by the flange portion 47. Coupled to 1, and integrally formed with the motor casing 4, compressor body 2 and the receiver tank 41.
[0017]
In the motor 4, a rotor 51 is fixed on the suction side rotor shaft 14 of the male rotor 6, the rotor shaft 14 and the rotation shaft of the motor 4, and the bearing 16 that supports the rotor shaft 14 and the rotation of the motor 4. A flange that is also used as a bearing that supports the shaft and that is formed on the end of the motor casing 53 on the compressor body side of the motor casing 53 that fixes the stator 52 of the motor 4. To the compressor main body 2.
[0018]
A communication hole 55 is formed in the power side housing 31 extending from the compressor main body 2 to communicate the internal space 32 (see FIG. 3) of the power side housing 31 with the outside of the power side housing 31. Then, the bearing chamber 18 positioned outside the mechanical seal 33 serving as the shaft seal device is closed, and a shaft seal cover 37 for fixing the mechanical seal 33 is provided on the outer periphery of the rotor shaft 14. A flange portion 56 bulging in the direction of the rotor shaft 14 is formed on the inner peripheral surface of the power side housing 31 at a position on the motor direction side of the communication hole 55, and the flange portion 56 and the shaft of the power side housing 31 are formed. A partition plate 57 for connecting the motor-side end wall surface of the sealing cover 37 is fixedly provided on the flange portion 56 and the motor-side end wall surface of the shaft sealing cover 37, and the power side housing 31 is covered to cover the motor casing 53. The inside and the power side housing 31 are separated and sealed.
[0019]
In the motor-integrated screw compressor configured as described above, the rotor 51 of the motor 4 is fixed to the suction-side rotor shaft 14 of the male rotor 6, whereby the components of the motor 4 are replaced with the components of the compressor body 2. Of course, since the motor 4 and the compressor body 2 are integrally formed, the overall length can be shortened compared to the conventional compressor. The inside of the power side housing 31 is partitioned by a partition plate 57 to seal a space (motor chamber 58) that houses the rotor 51 and the stator 52 of the motor 4, and between the suction side casing 11 and the partition plate 57. Is opened to the atmosphere through a communication hole 55 formed in the power side housing 31, so that when the lubricating oil leaks from the coupling surface of the suction side casing 11 and the shaft seal cover 37. , Is discharged to the outside of the power side housing 31 from the communication hole 55, it is possible to prevent the lubricating oil from entering the motor chamber 58. Further, the communication hole 55 can visually confirm whether or not the lubricating oil leaks from the coupling surface of the suction side casing 11 and the shaft seal cover 37. Further, even if the temperature of the compressor main body 2 rises during the operation of the compressor, the space between the suction-side casing 11 and the partition plate 57 is blocked by the internal space 32, the space is thermally insulated, and the motor 4 is connected to the compressor main body. The temperature does not increase due to the heat effect of 2. Even if the temperature of the motor 4 rises during the operation of the compressor, the space between the suction-side casing 11 and the partition plate 57 is blocked by the space to insulate the compressor body 2, and the compressor body 2 is affected by the heat of the motor 4. The temperature does not rise.
[0020]
Furthermore, with a relatively simple configuration, the motor chamber 58 that houses the rotor 51 and the stator 52 of the motor 4 by partitioning the motor casing 53 and the power side housing 31 can be sealed. It is possible to prevent dust and the like from entering the inside.
[0021]
3A and 3B show details of the second to fourth embodiments of the present invention. In the insertion hole formed in the shaft seal cover 37 of the shaft seal device 33, FIG. One end is fixed, and the other end is provided with a seal 29 between the drain collecting passage 28 facing the outside through the communication hole 55 communicating with the inside and outside of the power side housing 31 and the partition plate 57. . This seal 29 effectively prevents a very small amount of drain (lubricating oil) leaking from the shaft seal device 33 from passing through the rotor shaft 14 and entering the motor casing 53. FIG. A ring-shaped felt seal 29 is attached to a groove formed on the inner periphery of the shaft seal cover 37. The rotor shaft 14 is inserted into the center of the seal 29 and the rotor shaft 14 and the seal 29 are in contact with each other. Yes. As a result, the drain leaked from the shaft seal device 33 is prevented from entering the motor casing 53 by the seal 29 and discharged from the drain recovery passage 28 to the outside of the machine. The seal 29 is not limited to a felt seal. For example, the seal 29 is a screw seal in which a thread groove is cut on the inner periphery of the shaft seal cover 37 so as to flow in the direction opposite to the drain leakage direction due to the rotation of the rotor shaft 14. It may be present (FIG. 3B). Insulation failure of the motor body due to penetration of the lubricating oil into the motor casing 53, and the possibility of explosion due to the flammable gas dissolved in the lubricating oil when compressing the combustible compressed gas can be avoided. Other configurations are the same as those of the first embodiment.
[0022]
In FIG. 3B, as a third embodiment, the inner space 32 of the power side housing 31 and the shaft seal cover 37 are disposed between the drain collecting passage 28 and the partition plate 57 with respect to the shaft seal cover 37. A through hole 30 is formed to communicate a minute gap between the inner periphery of the rotor and the outer periphery of the rotor shaft on the motor casing 53 side.
[0023]
The above-mentioned drain and the compressed gas dissolved in the drain (lubricating oil) are discharged from the internal space 32 of the power side housing 31 through the through hole 30 to the outside through the communication hole 55.
[0024]
As a fourth embodiment, in order to cope with a case where leakage occurs from the seal 29 in the embodiment shown in FIGS. 3 (A) and 3 (B), a penetration is made between the seal 29 and the partition plate 57 here. A hole 30 is formed. When the compressed gas has a higher specific gravity than the outside air, corresponding to the properties of the compressed gas dissolved in the drain, the through hole 30 is located below the shaft seal cover 37 in the drawing (not shown). When the specific gravity is light, the through holes 30 are formed in the upper part of the drawing.
[0025]
The minute gap between the inner space 32 and the inner periphery of the shaft seal cover 37 and the outer periphery of the rotor shaft on the motor casing 53 side is substantially the same pressure, and the drain is smoothly discharged through the through hole 30.
[0026]
In addition, this invention is not limited to embodiment, For example, within a claim, it can deform | transform into various forms, such as a water injection type compressor and a slide vane compressor which used the cooling medium as water.
[0027]
【The invention's effect】
As described above, according to the present invention, the drive shaft of the compressor body and the rotating shaft of the motor are directly connected or integrally formed, and the power side housing extending from the compressor body and the motor casing are fixed, In the motor-integrated compressor in which the bearing that supports the drive shaft of the compressor body also serves as the bearing that supports the rotation shaft of the motor, the motor side of the bearing that supports the drive shaft on the drive shaft of the compressor body A shaft sealing device that prevents the lubricating oil that has lubricated the bearings of the compression body from leaking to the motor side, and a shaft sealing cover that fixes the shaft sealing device, and the power extending from the compressor body A communication hole that communicates the inside and outside of the power side housing is formed in the side housing, and the motor casing is connected to the inner peripheral surface of the power side housing and the shaft seal cover at a position of the communication hole on the motor side. Since the partition plate that separates the inside of the motor side from the inside of the power side housing is provided, even if the lubricating oil leaks from the compressor body, the lubricating oil is prevented from entering the motor chamber, and the compressor is operated during the operation of the compressor. Even if the temperature of the main body rises, the space between the compressor main body and the partition plate insulates, and the motor does not rise in temperature due to the heat effect of the compressor main body. Alternatively, even if the temperature of the motor rises during operation of the compressor, the space between the compressor body and the partition plate is thermally insulated, and the compressor body is not affected by the heat of the motor and the temperature does not rise. Furthermore, with a relatively simple configuration, the motor chamber that houses the rotor and stator of the motor can be sealed by partitioning the motor casing and the power side housing, and dust and the like can enter the motor chamber. Can be prevented.
[0028]
Further, according to the second and third inventions of the present application, it is possible to effectively prevent a very small amount of drain (lubricating oil) leaking from the shaft seal device 33 from entering the motor casing 53 through the rotor shaft 14, Accidents caused by poor motor insulation and explosion of combustible compressed gas dissolved in lubricating oil can be prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an oil-cooled screw compressor according to an embodiment of the present invention. FIG. 2 is a plan sectional view of an oil-cooled screw compressor according to an embodiment of the present invention. ), (B) are partial enlarged cross-sectional views showing the second to fourth embodiments of the present invention. FIG. 4 is a system diagram of a conventional oil-cooled screw compressor. FIG. 5 is a conventional screw compression. Cross section of machine body [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Oil-cooled screw compressor 2 Compressor body 3 Gas-liquid separator 4 Motor 6 Male rotor 8 Cylinder 9 Suction side casing 14 Rotor shaft (male rotor)
16 Bearing 21 Discharge side casing 28 Drain collection passage 29 Seal 30 Through-hole 31 Power side housing 32 Internal space 33 Mechanical seal 37 Shaft seal cover 51 Rotor 52 Stator 53 Motor casing 55 Communication hole 57 Partition plate

Claims (4)

The drive shaft of the compressor body and the rotation shaft of the motor are directly connected or integrally formed, the power side housing extending from the compressor body and the motor casing are fixed, and the bearing that supports the drive shaft of the compressor body is the motor. In a motor-integrated compressor that also serves as a bearing that supports the rotating shaft of
On the motor side of the bearing that supports the drive shaft on the drive shaft of the compressor body, a shaft seal device that prevents the lubricating oil that lubricated the bearings of the compressor body from leaking to the motor side and the shaft seal A shaft seal cover for fixing the device is formed, and a communication hole is formed in the power side housing extending from the compressor main body so as to communicate with the inside and outside of the power side housing, and the power side housing is covered. A motor-integrated compressor comprising a partition plate for separating and sealing the motor casing and the power side housing. The partition plate is fixed to a flange portion that bulges in the rotor axial direction from the inner peripheral surface of the power side housing at a position in the motor direction side of the communication hole, and a motor side end wall surface of the shaft seal cover. The motor-integrated compressor according to claim 1, wherein the members are connected and arranged. A drain collecting passage provided with one end fixed to an insertion hole formed in the shaft sealing cover of the shaft sealing device and the other end facing the outside from a communication hole communicating with the inside and outside of the power side housing; The motor-integrated compressor according to claim 1, wherein a seal is provided between the partition plate and the partition plate. An internal space of the power side housing and a minute gap between the inner periphery of the shaft seal cover and the outer periphery of the rotor shaft on the motor casing side communicate with the shaft seal cover between the drain collecting passage and the partition plate. The motor-integrated compressor according to claim 1 or 3, wherein a through-hole is formed.

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