JPH0719634A - Compressor unit - Google Patents

Abstract

PURPOSE:To obtain a compressor unit in which vibration and pressure loss of a cooler are suppressed, an oil amount in the unit can be controlled to a predetermined amount, and oil in the unit can be simply cooled. CONSTITUTION:Oil is removed from helium gas discharged from a compressor unit 10 having a low pressure shell by a rough oil separator 17, cooled by a gas cooler 21, oil is further removed by a fine oil separator 19, and fed to a suction unit 4. The oil separated by the separator 19 is sent to an oil injection tube 24 through an oil return tube 26, separated by the separator 17, and oil injected to an intermediate pressure part of a compressor 10 together with oil cooled by an oil cooler 25. Part of the oil cooled by the cooler 25 is returned to the compressor 10 through an oil return tube 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor unit suitable for use in a cryogenic refrigerator, which uses helium gas as a working gas, and the like.

[0002]

2. Description of the Related Art Conventionally, a Gifford-McMahon cycle or an improved Solvay cycle has been often used in a cryogenic refrigerator in view of its reliability and price. In these cycles, an oil using helium gas as a working gas is used. A lubricated compressor unit is used.

FIG. 5 is a system diagram showing an example of a conventional compressor unit. In the figure, 1 is a compressor, 2 is a cooler for cooling helium gas as a working gas compressed by the compressor 1, and 3 is a cooler. An oil separator for removing the mist of oil in the helium gas cooled by the cooler 2, 4 is an adsorber for removing the vapor contained in the helium gas that has passed through the oil separator 3,
5 is a surge bottle, 6 is an oil cooler for cooling the oil in the compression device 1, 7 is a relief valve, and the relief valve 7 connects the outlet of the oil separator 3 and the outlet of the surge bottle 5 with a bypass circuit 8 Is installed in the. Reference numeral 9 is a capillary tube that is interposed in a pipe that connects the outlet of the oil cooler 6 and the intake of the compressor 1.

Next, the operation of the above conventional compressor unit will be described. First, the helium gas is compressed by the compression device 1 to a high pressure / high temperature and enters the cooler 2, where it is cooled by cooling water. After that, the oil enters the oil separator 3, and the mist-like oil contained in the gas is removed here. Next, the helium gas from which the oil has been separated enters the adsorber 4, where the vapor contained in the gas is removed, and then sent to the expansion mechanism (not shown) of the cryogenic refrigerator. The low-pressure helium gas flowing from the cryogenic refrigerator is again sucked into the compression device 1 via the surge bottle 5.

On the other hand, the oil whose temperature is raised by lubricating the compression device 1 enters the oil cooler 6 from the lower part of the compression device 1 and is circulated to the compression device 1 through the capillary tube 9 after being cooled by the cooling water. . Here, the temperature of the oil flowing out from the oil cooler 6 decreases when the load of the compression device 1 decreases or the water temperature of the cooling water decreases, and the viscosity of the oil increases, and the capillary tube 9 accordingly.
The amount of oil passing through is reduced. As a result, the circulation amount of oil to the oil cooler 6 is automatically reduced, and the unnecessary circulation amount of oil is reduced. The oil separated by the oil separator 3 is also returned to the compression device 1.

[0006]

As described above, in the conventional compressor unit, since the helium gas discharged from the compressor 1 directly flows into the cooler 2, the oil contained in a large amount in the helium gas is generated. It becomes a plug flow that blocks the pipeline,
There is a problem that vibration occurs in the cooler 2 and pressure loss increases.

Further, since the amount of oil in the compressor 1 is not controlled to a predetermined amount, if the amount of oil becomes too large, the compressor motor will operate in the oil to generate heat, and If the amount becomes too small, there is a problem that the lubricating oil is not supplied to the compressor motor.

Further, since the oil in the compressor 1 is cooled by the oil circulation mechanism including the oil cooler 6, there is a problem that the unit cannot be downsized and the cost can not be reduced.

The present invention has been made to solve the above problems, and suppresses vibration and pressure loss in a cooler, can control the amount of oil in a compression device to a predetermined amount, and further can reduce the compression device. The object is to obtain a compressor unit that can easily cool the oil inside.

[0010]

A first aspect of the present invention is a compressor unit in which an oil separator is provided in a discharge line of a compressor having a low pressure shell. It is provided with a gas cooling cooler interposed in the discharge pipe line on the downstream side.

A second aspect of the present invention is a compressor unit in which an oil separator is provided in a discharge line of a compressor which houses a scroll compressor and a compressor motor in a low pressure shell. There is an oil injection pipe with one end connected to the oil return port of the oil separator and the other end connected to the intermediate pressure part of the scroll compressor, and an oil cooling cooler interposed in the oil injection pipe line. It is equipped with and.

A third aspect of the present invention is a compressor unit in which an oil separator is provided in a discharge line of a compressor which houses a scroll compressor and a compressor motor in a low pressure shell. There is an oil injection pipe with one end connected to the oil return port of the oil separator and the other end connected to the intermediate pressure part of the scroll compressor, and an oil cooling cooler interposed in the oil injection pipe line. And an oil return pipe branched from an oil injection pipe on the downstream side of the cooler and connected to the low-pressure shell.

A fourth aspect of the present invention is a compressor unit in which an oil separator is provided in a discharge line of a compressor which houses a scroll compressor and a compressor motor in a low pressure shell. There is a gas cooling cooler installed in the discharge conduit on the downstream side of the oil separator, and a second oil separation device installed in the discharge conduit on the downstream side of the gas cooling cooler. And an oil injection pipe whose one end side is connected to the oil return port of the oil separator and the other end side is connected to the intermediate pressure part of the scroll compressor, and an oil cooling cooler interposed in the oil injection pipe line. And an oil return pipe having one end connected to the oil return port of the second oil separator and the other end connected to the oil injection pipe on the downstream side of the oil cooling cooler.

A fifth aspect of the present invention is a compression system in which an oil separator and a cooler are provided in a discharge pipe line of a compressor which houses a compressor and a compressor motor in a low pressure shell. A machine unit, which is provided with a protrusion for lifting oil, which is provided at a lower portion of a rotor of a compressor motor.

A sixth aspect of the present invention is a compression system in which an oil separator and a cooler are provided in a discharge pipe line of a compressor which houses a compressor and a compressor motor in a low pressure shell. An ejector attached to the intake pipe of the compressor, and an oil suction pipe connected to the ejector at one end side and attached at the other end side so as to face the oil stored in the bottom of the low-pressure shell. It is equipped with.

A seventh aspect of the present invention is a compressor unit in which an oil separator and a cooler are provided in a discharge pipe line of a compression device, which is inert as a lubricating oil of the compression device. It is an oil to which an agent is added.

[0017]

In the first aspect of the present invention, the high-pressure / high-temperature working gas discharged from the compression device is removed by the oil separator from the mist-like oil contained in the gas, and then is supplied to the gas cooling cooler. It flows in and is cooled. In the gas cooling cooler, the plug flow due to the oil contained in the working gas that flows is suppressed, the occurrence of vibration is suppressed, and the pressure loss of the gas flow is reduced.

In the second invention of the present invention,
The oil separated by the oil separator is cooled by the oil cooling cooler and then injected into the intermediate pressure portion of the scroll compressor through the oil injection pipe. Then, the scroll compressor is cooled by the oil injection of the cooled oil, and the temperature rise is suppressed.

According to the third aspect of the present invention,
After the oil separated by the oil separator is cooled by the oil cooling cooler, it is injected into the intermediate pressure part of the scroll compressor through the oil injection pipe, and one of the oil cooled by the oil cooling cooler is further injected. The part is returned to the low pressure shell via an oil return pipe. Then, the cooled oil returned to the low-pressure shell acts in the same manner as in the second aspect of the invention,
The temperature rise of the oil stored in the low-pressure shell is suppressed, and the temperature rise of the compressor motor is suppressed.

In the fourth invention of the present invention,
The oil contained in the working gas that cannot be completely removed by the oil separator is removed by the second oil separator, and a high-purity high-pressure gas is produced. Further, the oil separated by the second oil separator is sent to the oil injection pipe through the oil return pipe, and is separated by the oil separator and cooled by the oil cooling cooler along with the intermediate pressure portion of the scroll compressor. Oil is injected into. Therefore, the high-pressure working gas contained in the oil separated by the second oil separator is returned to the oil injection pipe together with the oil, and is further returned to the intermediate pressure portion of the scroll compressor to reduce the high-pressure gas flow rate. In addition to being prevented, all the gas taken in by the scroll compressor can be sent to the expander.

In the fifth aspect of the present invention,
The protrusion rotates with the rotor of the compressor motor. When the amount of oil stored in the bottom of the low-pressure shell increases and a part of the protrusion comes to be immersed in the oil, the oil is lifted up by the rotation of the protrusion. The lifting of the oil by the rotation of the protrusion is continued until the oil surface is located below the protrusion. The lifted oil is sucked together with the working gas from the intake port of the compressor and discharged to the outside of the low pressure shell. Therefore, the amount of oil stored at the bottom of the low-pressure shell is controlled to a constant amount, and it is prevented that the rotor of the compressor motor rotates in the oil and heats up due to the excessive amount of oil.

In the sixth aspect of the present invention,
When the working gas is returned to the low pressure shell via the intake pipe,
The ejector acts to suck the gas in the oil suction pipe. Due to the suction force of the ejector, the oil stored in the bottom portion of the low-pressure shell is sucked up through the oil suction pipe and sent together with the working gas into the low-pressure shell through the intake pipe. The oil sent into the low-pressure shell is sucked together with the working gas from the intake port of the compressor and discharged to the outside of the low-pressure shell. The suction of oil by the suction force of the ejector is continued until the oil surface is located below the other end of the oil suction pipe. Therefore, the amount of oil stored in the bottom portion of the low-pressure shell is controlled to be constant, and it is prevented that the rotor of the compressor motor rotates in the oil and heats up due to the excessive amount of oil.

In the seventh aspect of the present invention,
The metal portion of the compressor unit has an active surface on its surface due to friction or the like, and the active surface of the metal acts to decompose oil. However, N in the molecule of the deactivator added to the oil bonds with the metal, and a film is formed on the metal surface. Therefore, the surface of the metal is inactivated, the decomposition of the oil is prevented, and the generation of the impure gas accompanying the decomposition of the oil is prevented.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. Example 1. Example 1 is an example according to the first to fourth and seventh aspects of the present invention. 1 is a system diagram showing a compressor unit according to Embodiment 1 of the present invention, and FIG. 2 is a configuration diagram showing a compression device of a compressor unit according to Embodiment 1 of the present invention, which is shown in FIG. The same or corresponding parts as those of the conventional compressor unit are designated by the same reference numerals, and the description thereof will be omitted. The solid arrows show the flow direction of the working gas (helium gas), and the broken arrows show the flow direction of oil in the figure.

In the figure, 10 is a compressor, and this compressor 10 has a scroll compressor 1 in a low pressure shell 11.
2 and the compressor motor 13 are housed.
The scroll compressor 12 has an intake port 12a facing the inside of the low-pressure shell 11, and a discharge port 12b connected to a discharge pipe 14 protruding from the low-pressure shell 11. The compressor motor 13 is composed of a motor stator 13a and a rotor 13b. Reference numeral 15 is oil stored in the bottom of the low-pressure shell 11, and 16 is an intake pipe provided in the low-pressure shell 11.

Reference numeral 17 is a crude oil separator as an oil separator connected to the discharge pipe 14 of the compressor 10 by a gas pipe 18, and 19 is a second oil connected to the crude oil separator 17 by a gas pipe 20. A fine oil separator as a separator, 21 is a gas cooling cooler arranged in the path of the gas pipe 20,
Reference numeral 22 is a gas pipe connecting the fine oil separator 19 and the adsorber 4, 23 is a gas return pipe connected to the intake pipe 16 of the compressor 10, and 24 is an oil return port of the rough oil separator 17 and scroll compression. An oil injection pipe connecting the intermediate pressure port 12c provided upright in the intermediate pressure portion of the machine 12, 25 is an oil cooling cooler arranged in the path of the oil injection pipe 24, and 26 is a fine oil separator 19 Is an oil return pipe connecting the oil return port of the oil injection pipe 24, 27 is an oil return pipe connecting the oil injection pipe 24 and the gas return pipe 23, and 28 is a throttle.

Here, the gas pipes 18, 20 and 22 form the discharge line of the compression device 10, and the oil 15 contains an inactivating agent such as N, N-bis (2-hydroxyethyl) -N-. Up to 1000 cyclohexylamines (Sanhibita: Sanyo Kasei)
ppm is added.

Next, the operation of the first embodiment will be described. First, the compressor motor 13 is operated to operate the rotor 13
Rotate b. The rotation of the rotor 13b causes the scroll compressor 12 to operate. At this time, in the scroll compressor 12, the low-pressure helium gas in the low-pressure shell 11 is sucked from the intake port 12a, compressed to a predetermined pressure, and delivered from the discharge port 12b to the discharge pipe 14 as high-pressure and high-temperature helium gas. At this time, the high-pressure helium gas compressed by the scroll compressor 12 is discharged to the outside of the low-pressure shell 11 and the shell 1
The pressure inside 1 is low. This high-pressure / high-temperature helium gas enters the crude oil separator 17 via the gas pipe 18,
Here, the oil in the helium gas is removed. The helium gas from which the oil has been removed by the rough oil separator 17 enters the gas cooling cooler 21 via the gas pipe 20 and is cooled there. Then, the cooled helium gas enters the fine oil separator 19 where the oil is further removed. Then, it enters the adsorber 4 through the gas pipe 22, where the vapor in the helium gas is removed, and then sent to the expansion mechanism of the cryogenic refrigerator.

On the other hand, the low-pressure helium gas flowing from the cryogenic refrigerator is returned to the low-pressure shell 11 via the gas return pipe 23 and the intake pipe 16.

The oil separated by the rough oil separator 17 is cooled by the oil cooling cooler 25, then passes through the oil injection pipe 24 and the intermediate pressure port 12c, and the intermediate pressure portion of the scroll compressor 12 is reached. Oil is injected into the gas return pipe 2 through the oil return pipe 27.
3 and is returned to the low pressure shell 11 together with the helium gas flowing from the ultra low pressure refrigerator. The oil separated by the fine oil separator 19 is sent to the oil injection pipe 24 through the oil return pipe 26, and is scrolled together with the oil separated by the rough oil separator 17 via the intermediate pressure port 12c. Oil is injected into the intermediate pressure portion of the compressor 12.

As described above, according to the first embodiment, since the high pressure and high temperature helium gas compressed by the scroll compressor 12 is not discharged into the low pressure shell 11, the temperature rise of the low pressure shell 11 is suppressed and the compression is suppressed. Machine motor 13, oil 15
Suppresses temperature rise.

Further, the helium gas is used as a crude oil separator 17
After the oil is removed by the oil is sent to the gas cooling cooler 21, a large amount of oil contained in the helium gas discharged from the compression device 10 is removed, and there is no plug flow due to the oil.
The generation of vibration in the gas cooling cooler 21 can be suppressed,
Moreover, the pressure loss of the gas flow could be reduced.

Since the oil separated by the rough oil separator 17 is cooled by the oil cooling cooler 25, the oil is injected into the intermediate pressure portion of the scroll compressor 12 through the oil injection pipe 24. , Scroll compressor 12
Was cooled, and the temperature rise could be suppressed.

Further, since the oil separated by the rough oil separator 17 is cooled by the oil cooling cooler 25, a part of the oil is returned to the compressor 10 through the oil return pipe 27. It was possible to suppress the temperature rise of the oil 15 in 11 and further suppress the temperature rise of the compressor motor 13.

Further, since the oil separated by the fine oil separator 19 is injected into the intermediate pressure portion of the scroll compressor 12 via the oil return pipe 26 and the oil injection pipe 24, the fine oil separator 19 It is possible to prevent the high-pressure helium gas contained in the oil separated in 19 from being returned together with the oil and reducing the high-pressure gas flow rate. Further, by returning the high pressure gas to the intermediate pressure portion, all the gas sucked by the scroll compressor 12 can be sent to the expander.

Further, since the deactivator is added to the oil 15, even if the metal portion of the compressor unit forms an active surface on the surface due to abrasion or the like, the deactivator reacts with the metal. A film of about angstrom is formed on the metal surface to make the metal surface inactive. As a result, the active surface of the metal surface disappears, the decomposition of the oil 15 by the active surface of the metal is suppressed, and the generation of impure gas such as hydrogen gas can be reduced.

Here, the deactivator deactivates the catalytic function of the metal, and N in the molecule of the deactivator bonds with the metal to form a complex to deactivate the metal. ing.
As the inactivating agent, N, N-bis (2-hydroxyethyl)-
Although N-cyclohexylamine is used, it is not limited to this and may be any one having the above-mentioned function, for example, 1,2,3-benzotriazole may be used.

Example 2. The second embodiment is an embodiment according to the fifth invention of the present invention. 3 is a block diagram showing a compressor of a compressor unit according to a second embodiment of the present invention, in which reference numeral 30 is a rotor 13b of a compressor motor 13.
It is a protrusion attached to the bottom of. The other configurations are the same as those in the first embodiment.

In the second embodiment, when the compressor motor 13 is operated, the protrusion 30 rotates together with the rotor 13b. Therefore, when the oil 15 stored in the bottom of the low-pressure shell 11 exceeds a predetermined amount, the oil 15 is lifted up by the rotation of the protrusion 30. And the oil 15
Becomes mist and the intake port 12a of the scroll compressor 12
Is sucked together with the helium gas from the low pressure shell 11 through the discharge pipe 14. The lifting of the oil 15 is continued until the oil surface is located below the protrusion 30.

According to the second embodiment, the compressor motor 13
Since the protrusion 30 is attached to the lower portion of the rotor 13a of the low pressure shell 11, when the oil 15 in the low pressure shell 11 exceeds a predetermined amount, it is lifted up and discharged to the outside of the low pressure shell 11 by the scroll compressor 12, The amount of oil 15 stored in the bottom could be controlled to be constant. as a result,
The amount of oil 15 in the low pressure shell 11 increases and the rotor 13
It is possible to prevent the problem that b rotates in oil and generates heat.

Example 3. The third embodiment is an embodiment according to the sixth invention of the present invention. 4 is a block diagram showing a compressor of a compressor unit according to a third embodiment of the present invention, in which 31 is an ejector attached to the intake pipe 16, 32 is one end connected to the ejector 31, and the other end is The oil suction pipe is attached so that its side contacts the oil 15 stored in the bottom of the low-pressure shell 11, and 33 is an inner wall surface of the lower portion of the intake pipe 16 of the low-pressure shell 11 and the intake port of the scroll compressor 12 An oil receiver 34 extending in the direction of 12a is attached, and an oil return pipe 34 is attached to the low-pressure shell 11, and an oil return pipe 27 branched from the oil injection pipe 24 is connected to the oil return pipe 34. .
The other configurations are the same as those in the first embodiment.

In the third embodiment, when the helium gas flowing from the cryogenic refrigerator is returned to the low pressure shell 11 via the gas return pipe 23, the ejector 31 sucks the gas in the oil suction pipe 32. Therefore, when the oil 15 stored in the bottom portion of the low-pressure shell 11 exceeds a predetermined amount, the other end of the oil suction pipe 32 is immersed in the oil 15, and the oil level is the other end of the oil suction pipe 32. The oil 15 is sucked up through the oil suction pipe 32 and is fed into the low pressure shell 11 through the intake pipe 16 until it coincides with the side. Then, it is sucked together with the helium gas from the intake port 12 a of the scroll compressor 12 and discharged to the outside of the low pressure shell 11. At this time, the oil receiver 33 receives the oil sent from the intake pipe 16 and suppresses the oil from dropping to the lower portion of the low-pressure shell 11.

According to the third embodiment, since the ejector 31 is attached to the intake pipe 16 and the oil suction pipe 32 is attached to the ejector 31, the surplus oil in the low pressure shell 11 is sucked up and the oil 15 in the low pressure shell 11 is absorbed. The amount of could be controlled to be constant.

In each of the above embodiments, the scroll compressor 12 is used, but other than the scroll compressor 12, other compressors can be used except when oil injection is performed.

[0045]

Since the present invention is constituted as described above, it has the following effects.

In the compressor unit according to the first aspect of the present invention, since the gas cooling cooler is provided in the discharge pipe line on the downstream side of the oil separator, the gas cooling cooler is provided. The oil in the working gas flowing through is removed, so that the generation of vibrations in the gas cooling cooler can be suppressed and the pressure loss of the gas flow can be reduced.

Further, in the compressor unit according to the second aspect of the present invention, one end side is connected to the oil return port of the oil separator, and the other end side is connected to the intermediate pressure part of the scroll compressor. Since the scroll compressor is provided with the oil cooling cooler interposed in the oil injection pipe, the scroll compressor is cooled and its temperature rise is suppressed.

Further, in the compressor unit according to the third aspect of the present invention, an oil injection pipe having one end connected to the oil return port of the oil separator and the other end connected to the intermediate pressure portion of the scroll compressor, is provided. , The oil cooling cooler interposed in the oil injection pipe, and the oil return pipe branched from the oil injection pipe on the downstream side of the cooler and connected to the low-pressure shell. In addition to the effect of the second aspect of the invention, the temperature rise of the oil stored in the bottom of the low-pressure shell is suppressed and the temperature rise of the compressor motor is suppressed.

Further, in the compressor unit according to the fourth aspect of the present invention, the gas cooling cooler provided in the discharge pipe line on the downstream side of the oil separator and the gas cooling cooler are provided. A second oil separator interposed in the discharge pipe on the flow side, and an oil injection pipe having one end connected to the oil return port of the oil separator and the other end connected to the intermediate pressure portion of the scroll compressor. An oil cooling cooler interposed in the oil injection line,
One end side is connected to the oil return port of the second oil separator, and the other end side is provided with an oil return pipe connected to the oil injection pipe on the downstream side of the oil cooling cooler. In addition to the effect of the invention of 2, the high-purity high-pressure gas can be produced. Further, the high-pressure working gas contained in the oil separated by the second oil separator is not returned to the low-pressure circuit but is oil-injected into the scroll compressor to prevent the high-pressure gas flow rate from decreasing. it can. Furthermore, all the gas taken in by the scroll compressor can be sent to the expander.

Further, in the compressor unit according to the fifth aspect of the present invention, since it is provided with the oil scraping protrusion provided on the lower portion of the rotor of the compressor motor, liquid is stored at the bottom of the low pressure shell. The amount of oil present is controlled to be constant, and heat generation due to rotation of the rotor that occurs when the amount of oil is too large can be prevented.

Further, in the compressor unit according to the sixth aspect of the present invention, an ejector attached to the intake pipe of the compressor, one end side of which is connected to the ejector, and the other end side of which is stored in the bottom portion of the low pressure shell. Since the oil suction pipe is installed so as to face the existing oil, the amount of oil stored in the bottom of the low-pressure shell is controlled to be constant, and the same effect as the fifth aspect of the invention is achieved.

Further, in the compressor unit according to the seventh aspect of the present invention, since the oil to which the deactivator is added is used as the lubricating oil of the compressor, the active surface is generated in the metal portion of the compressor unit. However, the deactivator reacts with the metal to deactivate the metal surface and prevent the decomposition of oil.

[Brief description of drawings]

FIG. 1 is a system diagram showing a compressor unit according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a compression device of the compressor unit according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram showing a compression device of a compressor unit according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram showing a compression device of a compressor unit according to a third embodiment of the present invention.

FIG. 5 is a system diagram showing an example of a conventional compressor unit.

[Explanation of symbols]

 10 Compressor 11 Low Pressure Shell 12 Scroll Compressor 13 Compressor Motor 13b Rotor 15 Oil 16 Intake Pipe 17 Rough Oil Separator (Oil Separator) 18 Gas Pipe (Discharge Pipeline) 19 Fine Oil Separator (Second Oil) Separator 20 Gas pipe (discharge pipe line) 21 Gas cooling cooler 22 Gas pipe (discharge pipe line) 24 Oil injection pipe 25 Oil cooling cooler 26 Oil return pipe 27 Oil return pipe 30 Protrusion 31 Ejector 32 Oil suction tube

Front page continued (72) Inventor Takashi Hara, 651 Tenwa, Ako City, Ako Plant, Mitsubishi Electric Corporation (72) Inventor, Hideto Yoshimura, 8-1-1 Tsukaguchi Honcho, Amagasaki City, Central Research Laboratory, Mitsubishi Electric Corporation (72) Inventor Masashi Nagao 8-1-1 Tsukaguchi Honcho, Amagasaki City Mitsubishi Electric Corporation Central Research Institute (72) Inventor Takashi Inaguchi 8-1-1 Tsukaguchi Honmachi Amagasaki City Central Research Institute (72 ) Inventor Yoshihisa Kito 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation Central Research Laboratory

Claims (7)

[Claims] 1. A compressor unit in which an oil separator is installed in a discharge line of a compressor having a low-pressure shell, the compressor unit being installed in a discharge line on a downstream side of the oil separator. A compressor unit comprising a gas cooling cooler. 2. A compressor unit in which an oil separator is provided in a discharge line of a compressor which houses a scroll compressor and a compressor motor in a low-pressure shell, one end side of which is the oil separator. An oil injection pipe connected to the oil return port of the scroll compressor, the other end of which is connected to the intermediate pressure portion of the scroll compressor, and an oil cooling cooler interposed in the oil injection pipe line. Characteristic compressor unit. 3. A compressor unit in which an oil separator is interposed in a discharge line of a compressor which houses a scroll compressor and a compressor motor in a low-pressure shell, and one end side of which is the oil separator. Oil injection pipe connected to the oil return port of the other end side is connected to the intermediate pressure portion of the scroll compressor, an oil cooling cooler interposed in the oil injection pipe line, and A compressor unit, comprising: an oil return pipe branched from the oil injection pipe on the downstream side and connected to the low-pressure shell. 4. A compressor unit in which an oil separator is provided in a discharge line of a compressor which houses a scroll compressor and a compressor motor in a low-pressure shell, the compressor unit after the oil separator. A gas cooling cooler installed in the discharge pipe line on the flow side, a second oil separator installed in the discharge pipe line on the downstream side of the gas cooling cooler, and one end side of the oil An oil injection pipe connected to the oil return port of the separator, the other end side of which is connected to the intermediate pressure portion of the scroll compressor, an oil cooling cooler interposed in the oil injection pipe line, and one end side of which A compressor provided with an oil return pipe connected to an oil return port of the second oil separator and having the other end side connected to the oil injection pipe on the downstream side of the oil cooling cooler. unit. 5. A compressor unit in which an oil separator and a cooler are provided in a discharge pipe line of a compressor which houses a compressor and a compressor motor in a low-pressure shell, the compressor unit comprising: A compressor unit comprising a protrusion for oil lifting provided on a lower portion of a rotor of a motor. 6. A compressor unit in which an oil separator and a cooler are provided in a discharge pipe line of a compressor which houses a compressor and a compressor motor in a low-pressure shell. And an oil suction pipe having one end connected to the ejector and the other end attached so as to face the oil stored in the bottom of the low-pressure shell. And compressor unit. 7. A compressor unit in which an oil separator and a cooler are interposed in a discharge line of a compression device, wherein an oil to which a deactivator is added is used as lubricating oil of the compression device. A compressor unit characterized by having been used.