CN114046247A - Helium compressor with oil cooling motor coil function - Google Patents

Abstract

The invention discloses a helium compressor with a function of cooling a motor coil by oil, which comprises a scroll pack shell (9), a main oil way (29), an oil content oil way (15), a silicon steel sheet (7), a motor coil (6) and a rotor (12), wherein the motor coil (6) comprises a coil front area (8) and a coil rear area (5), corresponding oil return ports are respectively arranged on the scroll pack shell (9) corresponding to the coil front area (8) and the coil rear area (5), and cooling lubricating oil output from a bypass oil way (21) communicated with the main oil way (29) sprays the coil front area (8) through the oil return port under the action of pressure difference and cooling lubricating oil output from the oil content oil way (15) sprays the coil rear area (5) through the other oil return port under the action of pressure difference, or vice versa. The invention sprays the two ends of the motor coil by cooled lubricating oil, takes away the heat generated by the motor coil during working, and improves the service life and reliability of the motor.

Description

Helium compressor with oil cooling motor coil function

Technical Field

The invention belongs to the technical field of vortex helium compressors, and particularly relates to a helium compressor with an oil cooling motor coil function.

Background

The oil lubrication air conditioner compressor is used for the pressurization helium of the directional GM type low-temperature refrigerator and becomes a standard, and a mature method can solve the problem that a scroll plate generates a large amount of compression heat in the process of compressing the helium, namely, the helium is mixed with a large amount of lubricating oil and then is sent into the scroll plate by increasing the oil injection amount of the compressor, and the scroll plate is lubricated by the lubricating oil and the compression heat is taken away. The high-temperature lubricating oil and the compressed helium gas are cooled by an external cooler. Because the helium has small molecules and the Freon working medium has large molecules, the leakage rate of the process of compressing the helium by the scroll is far greater than that of compressing the Freon working medium, the excessive oil is added, the sealing performance of the scroll can be improved, and the leakage rate of the helium compressed by the scroll is reduced.

The low-pressure cavity scroll compressor is one of the mainstream technologies of the scroll compressor, and the technology is used by Dajin, Mitsubishi, Denfoss, Emerson valley wheel and British in the current market. The high-pressure cavity vortex compressor represents Hitachi Corporation, and the input power of the series helium vortex compressor is 2-10kW, the helium vortex compressor has backflow gas directly flowing to a vortex disc, oil and the helium can enter a vortex disc compression cavity together to play roles of cooling, lubricating and sealing the vortex disc, high-temperature high-pressure oil and gas after compression are separated and accumulated at the bottom of the compressor, and the high-temperature helium and the high-temperature lubricating oil take away heat through external heat exchange under the action of differential pressure.

Copeland Compressor Corporation adds a low-pressure cavity oil-gas mixing channel at the inlet of the scroll plate by improving the scroll helium gas Compressor of the air-conditioning equipment, sends the mixed oil-gas into the scroll plate and adds a room high-pressure oil collecting device in the high-pressure cavity, and the high-temperature high-pressure lubricating oil and the helium gas are cooled in an external cooler.

In a Chinese patent CN101063450 granted to Stefin & Denne, an oil way of a Copeland horizontal fixed air-conditioning scroll compressor is improved, the oil way is applied to compressing helium, resistance in the rotation process of a bearing of the compressor is reduced by increasing an oil bypass path between a motor and a bottom oil pool, and input power and vibration of the compressor are reduced.

The scroll compressor compresses helium and all need pour into a large amount of lubricating oil into the scroll dish in, compare ordinary air conditioner scroll compressor, the rated consumption of motor work will increase, motor running current increases, the motor calorific capacity will greatly increased, temperature protection device has on the air conditioner scroll compressor motor coil simultaneously, the great current will reduce the threshold value of protection temperature, arouses compressor motor automatic shutdown protection at the refrigerator cooling in-process.

Therefore, there is a need for an improved motor cooling system during Copeland horizontal orientation use.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a helium compressor with an oil cooling motor coil function.

The invention aims to solve the problems by the following technical scheme:

the utility model provides a helium compressor with oil cooling motor coil function, includes the oil content oil circuit of the main oil circuit of scroll package casing, intercommunication heat exchanger, the fine separator of intercommunication oil gas, contains the motor that silicon steel sheet, motor coil and rotor constitute in the scroll package casing, its characterized in that: the motor coil comprises a coil front area positioned on the front side of the silicon steel sheet and a coil rear area positioned on the rear side of the silicon steel sheet, corresponding oil return ports are respectively arranged on scroll pack shells corresponding to the coil front area and the coil rear area, cooling lubricating oil output from a bypass oil way communicated with a main oil way sprays the coil front area through the oil return port under the action of pressure difference, and cooling lubricating oil output from an oil way sprays the coil rear area through the other oil return port under the action of pressure difference, or cooling lubricating oil output from the bypass oil way communicated with the main oil way sprays the coil rear area through the oil return port under the action of pressure difference, and cooling lubricating oil output from the oil way sprays the coil front area through the other oil return port under the action of pressure difference.

The front coil area is an area defined by the front coil end of the motor coil and the front silicon steel sheet ends of the silicon steel sheets, and the rear coil area is an area defined by the rear coil end of the motor coil and the rear silicon steel sheet ends of the silicon steel sheets.

The axial length of the coil front region along the rotor does not exceed 1/3 from the coil front end of the motor coil to the coil rear end along the axial length of the rotor, and is generally 1/5-1/6.

The axial length of the coil rear area along the rotor is not more than 1/3 from the coil front end of the motor coil to the coil rear end along the axial length of the rotor, and is generally 1/5-1/6.

The oil return port is positioned on the circumference of the scroll pack shell corresponding to the front coil area and the rear coil area.

When the oil return port corresponding to the oil distribution passage is positioned at the lower part of the scroll pack shell, the oil distribution passage is provided with a one-way valve so as to prevent lubricating oil in the scroll pack shell from reversely flowing into the oil-gas fine separator through the oil distribution passage in the shutdown process of the helium compressor.

The minimum flow of the cooling lubricating oil output by the oil separating passage is determined according to the oil speed generated by the oil separated by the oil-gas fine separator.

The maximum flow of the cooling lubricating oil output by the bypass oil way is determined by the minimum flow required by the oil nozzle oil way for lubricating the bearing.

The bypass oil way is provided with a bypass oil saving mechanism which is composed of small holes with variable apertures, thereby achieving variable working conditions or variable frequency operation.

The oil-saving mechanism is arranged on the oil-dividing oil path and consists of small holes with variable apertures, so that variable working conditions or variable frequency operation is achieved.

Compared with the prior art, the invention has the following advantages:

according to the helium compressor, the lubricating oil cooled outside is divided into three paths, except for one path of lubricating bearings, one path of the lubricating oil is cooled lubricating oil filtered from the oil-gas fine separator, the other path of the lubricating oil is cooled lubricating oil which is needed to lubricate the bearings and is redundant, the two paths of cooled lubricating oil enter the low-pressure cavity of the compressor under the action of pressure difference to spray and cool the motor coil areas on two sides of the silicon steel sheet, heat generated when the motor coils work is taken away through the lubricating oil, the temperature of the motor is reduced, and the service life and the reliability of the motor can be obviously prolonged.

The helium compressor provided by the invention has the advantages that the cooling lubricating oil sprayed on the motor coil is deposited at the bottom of the scroll pack shell under the action of gravity and enters the scroll plate together with the backflow gas for compression, so that the scroll plate is further lubricated, the compression heat is taken away, and the effect of killing two birds with one stone is achieved.

Drawings

FIG. 1 is a schematic representation of a prior art helium compressor with oil bypass showing a standard Copeland scroll compressor with a horizontal mounting oil bypass system;

FIG. 2 is a schematic structural view of a helium compressor with oil cooling motor coil functionality of the present invention showing a horizontally mounted standard low pressure cavity helium compressor with motor coil cooling;

FIG. 3 is a schematic diagram of a first embodiment of a helium compressor with oil cooling motor coil functionality of the present invention, showing the separation of the externally cooled lubricant into three paths when the oil cools the scroll compressor of the motor coil: one path of the lubricating oil is the lubricating oil filtered from the oil-gas fine separator and cooled, and enters the coil rear area of the compressor low-pressure cavity cooling motor coil under the action of pressure difference, the second path of the lubricating oil is the lubricating oil which is needed by lubricating the bearing and is redundant and enters the coil front area of the compressor low-pressure cavity cooling motor coil under the action of pressure difference, and the third path of lubricating bearing;

FIG. 4 is a schematic diagram of a second embodiment of the helium compressor with oil cooling motor coil functionality of the present invention, showing the division of the externally cooled lubricant into three paths when the oil cools the scroll compressor of the motor coil: one path of the lubricating oil is the lubricating oil filtered from the oil-gas fine separator and cooled, and enters the front coil area of the compressor low-pressure cavity cooling motor coil under the action of pressure difference, the second path of the lubricating oil is the lubricating oil which is needed by the lubricating bearing and is redundant and enters the rear coil area of the compressor low-pressure cavity cooling motor coil under the action of pressure difference, and the third path of the lubricating bearing.

Wherein: 1-helium compressor; 2-1-high pressure air supply port; 2-low pressure return air port; 3, a filter; 4-oil saving mechanism; 5-coil back zone; 6-motor coil; 7-silicon steel sheet; 8-coil front area; 9-scroll pack housing; 10-high pressure chamber; 11-a scroll; 12-a rotor; 13-a bearing; 14-bottom oil jet; 15-oil separation path; 16-a pressure reducing bypass line; 17-a pressure reducing bypass solenoid valve; 18-high pressure relief valve; 19-adsorber line; 20-oil nozzle oil way; 21-bypass oil circuit; 22-a bypass fuel-saving mechanism; 23-high temperature high pressure mixing pipe; 24-oil-gas crude separator; 25-roughly dividing a lubricating oil pipeline; 26-rough-dividing mixed pipeline; 27-a heat exchanger; 28-cooling the helium pipeline; 29-main oil circuit; 30-oil-gas fine separator; 31-adsorber; 32-lubricating oil; 33-oil-gas mixture; 34-high temperature and high pressure temperature sensor; 35-cooling the helium temperature sensor; 36-high pressure outlet pipe; 37-low pressure return gas line; 38-orifice; 39-high pressure sensor; 40-a low pressure sensor; 41-coil front end; 42-front end of silicon steel sheet; 43-rear end of silicon steel sheet; 44 — coil back end.

Detailed Description

The invention is further described with reference to the following figures and examples.

As shown in fig. 2-4: a helium compressor with the function of cooling a motor coil by oil is disclosed, a helium scroll pack consists of a scroll pack shell 9, a bearing 13, a rotor 12, a silicon steel sheet 7, a motor coil 6, a scroll plate 11 and a high-pressure chamber 10, the exterior of the helium scroll pack consists of main components such as an oil-gas coarse separator 24, a heat exchanger 27, an oil-gas fine separator 30, an absorber 31 and the like and pipeline accessories, a main oil path 29 communicated with the heat exchanger 27 supplies cooled lubricating oil to the bearing 13, an oil path 15 communicated with the oil-gas fine separator 30 supplies the lubricating oil deposited at the bottom of the oil-gas fine separator 30 to the helium scroll pack, the motor consists of the silicon steel sheet 7, the motor coil 6 and the rotor 12, the motor coil 6 comprises a coil front area 8 positioned at the front side of the silicon steel sheet 7 and a coil rear area 5 positioned at the rear side of the silicon steel sheet 7, wherein the coil front area 8 is an area enclosed by a coil front end 41 of the motor coil 6 and a silicon steel sheet front end 42 of the silicon steel sheet 7, The coil back area 5 is an area enclosed by the coil back end 44 of the motor coil 6 and the silicon steel sheet back end 43 of the silicon steel sheet 7, the axial length of the coil front area 8 along the rotor 12 is not more than 1/3 from the coil front end 41 to the coil back end 44 of the motor coil 6 along the axial length of the rotor 12, the axial length of the coil back area 5 along the rotor 12 is not more than 1/3 from the coil front end 41 to the coil back end 44 of the motor coil 6 along the axial length of the rotor 12, generally 1/5-1/6, corresponding oil return ports are respectively arranged on the scroll pack housings 9 corresponding to the coil front area 8 and the coil back area 5, cooling lubricating oil output from a bypass oil path 21 communicated with a main oil path 29 is sprayed to the coil front area 8 through the oil return port under the action of pressure difference, and cooling lubricating oil output from an oil separating path 15 is sprayed to the coil back area 5 through the other oil return port under the action of pressure difference, Or the cooling lubricating oil output from the bypass oil path 21 communicated with the main oil path 29 sprays the coil rear area 5 through one oil return port under the action of pressure difference, and the cooling lubricating oil output from the oil dividing oil path 15 sprays the coil front area 8 through the other oil return port under the action of pressure difference; the cooling lubricating oil sprayed on the motor coil 6 is deposited at the bottom of the scroll pack shell 9 under the action of gravity and enters the scroll plate 11 together with the backflow gas to be compressed, so that the scroll plate 11 is further lubricated while the compression heat is taken away, and the effect of killing two birds with one stone is achieved.

In the above structure, the oil return port is located on the circumference of the scroll pack housing 9 corresponding to the coil front region 8 and the coil rear region 5. When the oil return port corresponding to the oil distribution passage 15 is located at the lower part of the scroll pack housing 9 (as shown in fig. 4), a check valve may be provided in the oil distribution passage 15 to prevent the lubricating oil 32 in the scroll pack housing 9 from flowing back into the oil-gas fine separator 30 through the oil distribution passage 15 during the shutdown of the helium compressor 1. It should be understood that the minimum flow rate of the cooling lubricant outputted from the oil separation passage 15 is determined by the oil velocity of the oil separated by the oil-gas fine separator 30, and the maximum flow rate of the cooling lubricant outputted from the bypass passage 21 is determined by the minimum flow rate required for the oil nozzle passage 20 to lubricate the bearing 13. In addition, in order to realize variable working conditions or variable frequency operation, a bypass oil saving mechanism 22 is arranged on the bypass oil path 21, and/or an oil saving mechanism 4 is arranged on the oil dividing oil path 15, wherein the bypass oil saving mechanism 22 and the oil saving mechanism 4 are formed by small holes with variable apertures.

Fig. 2 shows a preferred embodiment of the invention, an arrangement for oil cooling of motor coils of a compressor unit, which arrangement is used in a helium compressor 1 according to the invention, i.e. a helium compressor with oil cooling of motor coils is provided. The helium compressor 1 comprises a scroll pack housing 9, wherein a motor consisting of a silicon steel sheet 7, a winding coil 6 and a rotor 12 is contained in the scroll pack housing 9, and the motor drives a scroll plate 11 of the scroll compressor through a bearing 13. The bearing 13 is a hollow structure with an oil suction pump at the bottom, and can suck the lubricating oil in the return oil sprayed by the bottom oil nozzle 14 to lubricate the bearing 13 of the fixed scroll 11. The lubricant oil 32 is deposited on the bottom of the scroll pack housing 9, and the lubricant oil 32 can maintain the flow of oil at both ends of the motor through the gap between the scroll pack housing 9 and the silicon steel sheet 7. Compared with the prior art shown in fig. 1 in which the redundant oil for lubricating the bearing is directly introduced to the suction inlet of the scroll 11, the technical scheme of the present invention is to inject the externally cooled lubricating oil into the region from the outer end surface of the motor coil 6 to the front of the silicon steel sheet 7, that is, the region of the coil front region 8 between the coil front end 41 and the silicon steel sheet front end 42 and the region of the coil rear region 5 between the coil rear end 44 and the silicon steel sheet rear end 43 on the scroll pack housing 9, and two oil return ports are opened to respectively communicate the oil distribution passage 15 and the bypass oil passage 21. Wherein the interval length of the coil front region 8 and the interval length of the coil rear region 5 each account for 1/6 of the total length of the motor coil 6 in the axial direction of the rotor 12.

The compression of helium by the scroll plate is greatly different from the compression of air-conditioning refrigerants, and the temperature rise in the compression process is much higher than that of the compression of air-conditioning refrigerant due to the large adiabatic index of helium when the helium is compressed. High temperature can lead to lubricating oil to deteriorate, scroll 11 and motor damage and motor self preservation protect shut down, and the prior art who adopts to solve high temperature at present increases the required lubricating oil's of compressor operation in-process volume, inhales some oil into scroll 11 in the helium compression process for cooling and lubricated scroll 11 and helium, reduces the temperature that produces in the compression process, keeps compression temperature within the admissible limit.

After being cooled externally, the lubricating oil returns to the compressor through the main oil path 29 under the action of pressure difference, takes away heat generated in the compression process and is discharged out of the system.

Because the compression chamber is mixed with more lubricating oil than the operating condition of the air conditioner, and the liquid is difficult to compress, the power consumption of the motor for driving the compression of the scroll plate is obviously increased, the rated output power is increased by 20-40% compared with the rated output power of the operation of the air conditioner, and the current and the heat productivity of the motor coil 6 are obviously increased.

In the configuration shown in fig. 2, the heat generation amount of the motor coil 6 is cooled by the cooling lubricant sprayed from the oil passage 15 and the bypass passage 21, so that the motor operates in an optimum temperature range, as shown in fig. 2 and 3.

Prior to the present invention, the oil distribution passage 15 in the prior art shown in fig. 1 directly injects return oil into the rear portion of the scroll pack case 9, and the bypass passage 21 bypasses the motor and directly injects return oil into the vicinity of the scroll plate 11, and is not used for cooling the motor coil 6.

In the alternative embodiment shown in fig. 4, the positions of the oil dividing passage 15 and the oil dividing passage 21 are switched with respect to the embodiment shown in fig. 3, and the oil returning passage 21 returns the oil to cool the coil back region 5 of the motor coil 6 and the oil dividing passage 15 returns the oil to cool the coil front region 8 of the motor coil 6.

Generally, a compressor is a power mechanism that draws in gas at a lower pressure and increases it to a higher pressure. A compressor, as used herein, is defined as a component of a cryocooler that provides the helium gas flow rate and pressure required by the cryocooler. More specifically, the compressor employed herein is an oil-lubricated scroll compressor, and the temperature generated by the motor coil 6 is lowered by using the cooled lubricating oil.

In more detail, in fig. 2-4, helium gas is mixed with lubricating oil 32 deposited from the bottom of the scroll pack housing 9 to form an oil-gas mixture 33 which is sucked into the scroll 11, and the arrows between the scroll 11 and the high pressure chamber 10 indicate that the helium gas and the lubricating oil mixture leave the compression chamber of the scroll 11 and flow into the high pressure chamber 10. The high-temperature high-pressure oil-gas mixture in the high-pressure cavity 10 passes through a high-temperature high-pressure mixing pipeline 23 to an oil-gas rough separator 24, and more than 99.9% of oil and helium gas are filtered in the oil-gas rough separator 24. The rest less than 0.1% of lubricating oil/helium gas passes through a rough-component mixed pipeline 26, more than 99.9% of lubricating oil passes through a rough-component lubricating oil pipeline 25 and respectively enters a heat exchanger 27, the lubricating oil and the helium gas are respectively cooled in the heat exchanger 27 by utilizing a countercurrent high-efficiency heat exchange technology, the cooled lubricating oil is sprayed into the scroll pack shell 9 through a main oil way 29, an oil nozzle oil way 20 and a bottom oil nozzle 14 (one part of the lubricating oil enters a bearing 13 of the scroll compressor, the other part of the lubricating oil drips in lubricating oil 32 deposited at the bottom of the shell 9), and one part of the cooled lubricating oil sprays and cools a coil rear area 5 or a coil front area 8 of the motor coil 6 through the main oil way 29 and a bypass oil way 21 with a bypass oil saving mechanism 22, and the cooling one end of the motor coil 6 is deposited at the bottom of the scroll pack shell 9. The cooled helium gas flows into the oil-gas fine separator 30 through the cooling helium gas pipeline 28, the lubricating oil mixed in the helium gas is further separated in the oil-gas fine separator 30, most of the lubricating oil is separated by the oil-gas fine separator 30 and is accumulated at the bottom of the oil-gas fine separator 30, the lubricating oil accumulated at the bottom of the oil-gas fine separator 30 returns to the scroll pack shell 9 through the oil content oil-separating pipeline 15, the filter 3 and the oil content oil-saving mechanism 4 and is sprayed in the coil front area 8 or the coil rear area 5 of the cooling motor coil 6; the helium filtered from the oil-gas fine separator 30 only contains trace oil mist or oil molecules, the helium containing the trace oil mist enters the adsorber 31 through the adsorber pipeline 19, the purity of the helium reaching the high-pressure gas outlet pipe 36 after being adsorbed by the adsorber 31 can reach 99.995%, the adsorber 31 adsorbs impurities of oil and water in the helium, and the adsorption is saturated after a certain time, so that the helium needs to be replaced periodically; in addition, a high-pressure safety valve 18 is arranged on the oil-gas fine separator 30, and the high-pressure safety valve 18 is used for opening to release pressure to the outside when the system operation pressure exceeds the design pressure; the pipeline between the high-pressure air supply port 2-1 and the low-pressure air return port 2-2 is subjected to heat insulation air extraction refrigeration and depressurization by a cold head of the GM refrigerator, so that the high-pressure air return output by the adsorber 31 through the high-pressure air supply port 2-1 becomes the normal-temperature low-pressure air return 42 before reaching the low-pressure air return port 2-2.

The return air 42 at normal temperature and low pressure after the work is done is returned to the casing 9 of the compressor through the filter 3 by the low-pressure return air pipe 37. The compressor is provided with a pressure reducing bypass pipeline 16 between high pressure and low pressure, when the pressure value detected by a high pressure sensor 39 is greater than a set value, a pressure reducing bypass electromagnetic valve 17 is opened, high-pressure gas enters a low-pressure gas return pipeline 37 through the pressure reducing bypass pipeline 16 with the pressure reducing bypass electromagnetic valve 17 and a throttling hole 38, and therefore the purpose of reducing the pressure of the high-pressure pipeline is achieved. In the normal working process, the pressure reducing bypass electromagnetic valve 17 is closed; when the system stops running, the pressure reducing bypass electromagnetic valve 17 is opened, and gas flows into the low-pressure return gas pipeline 37 through the pressure reducing bypass pipeline 16, so that the high-pressure and low-pressure balance of the scroll compressor is realized. When the pressure value detected by the high-pressure sensor 39 is greater than or equal to the set alarm value in the system operation process, the system of the helium compressor 1 stops operating, and when the pressure value detected by the low-pressure sensor 40 is less than or equal to the set alarm value in the system operation process, the helium compressor 1 stops operating. The high temperature and high pressure temperature sensor 34 detects the temperature of the mixture of helium and oil at the outlet side of the scroll pack, the cooled helium temperature sensor 35 detects the temperature of the cooled helium, and when the detected temperature exceeds a set alarm value, the system of the helium compressor 1 stops alarming.

The invention has the advantages that the temperature generated by the motor when the Freon scroll compressor compresses helium can be reduced, and for helium compressors with different discharge capacities, the temperature of the motor and the surrounding shell can be reduced by 4-10 ℃ by adopting the structural improvement provided by the invention, so that the reliability and the service life of the whole system are improved.

Example one

For having 80Nm³The helium compressor with the exhaust gas volume at the outlet per hour can reduce the temperature of the motor and the shell around the motor by 4-6 ℃ by adopting the structural improvement provided by the invention, and the cooling effect is shown in the following table.

Having described the invention, it will be recognized that further modifications are possible, the utility and/or applicability of the invention generally follows the principles of the invention and includes such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains, and as may be applied to the essential features hereinbefore set forth, as fall within the scope of the invention or the limits of the appended claims; the technology not related to the invention can be realized by the prior art.

Claims (10)

1. The utility model provides a helium compressor with oil cooling motor coil function, includes scroll package casing (9), main oil circuit (29) of intercommunication heat exchanger (27), the oil content oil circuit (15) of fine separator (30) of intercommunication oil gas, contains silicon steel sheet (7), motor coil (6) and the motor that rotor (12) are constituteed in scroll package casing (9), its characterized in that: the motor coil (6) comprises a coil front area (8) positioned on the front side of the silicon steel sheet (7) and a coil rear area (5) positioned on the rear side of the silicon steel sheet (7), corresponding oil return ports are respectively arranged on scroll packet shells (9) corresponding to the coil front area (8) and the coil rear area (5), cooling lubricating oil output from a bypass oil path (21) communicated with a main oil path (29) sprays the coil front area (8) through one oil return port under the action of pressure difference, and cooling lubricating oil output from an oil distribution oil path (15) sprays the coil rear area (5) through the other oil return port under the action of pressure difference, or cooling lubricating oil output from the bypass oil path (21) communicated with the main oil path (29) sprays the coil rear area (5) through the one oil return port under the action of pressure difference, and cooling lubricating oil output from the oil distribution oil path (15) sprays the coil front area (8) through the other oil return port under the action of pressure difference.

2. The helium compressor with oil cooling motor coil function as claimed in claim 1, wherein: the coil front area (8) is an area defined by the coil front end (41) of the motor coil (6) and the silicon steel sheet front end (42) of the silicon steel sheet (7), and the coil rear area (5) is an area defined by the coil rear end (44) of the motor coil (6) and the silicon steel sheet rear end (43) of the silicon steel sheet (7).

3. A helium compressor with oil cooling motor coil function according to claim 1 or 2, characterized in that: the axial length of the coil front region (8) along the rotor (12) is not more than 1/3 from the coil front end (41) to the coil rear end (44) of the motor coil (6) along the axial length of the rotor (12).

4. A helium compressor with oil cooling motor coil function according to claim 1 or 2, characterized in that: the axial length of the coil rear area (5) along the rotor (12) does not exceed the axial length 1/3 of the coil front end (41) to the coil rear end (44) of the motor coil (6) along the rotor (12).

5. The helium compressor with oil cooling motor coil function as claimed in claim 1, wherein: the oil return port is positioned on the circumference of the scroll pack shell (9) corresponding to the coil front region (8) and the coil rear region (5).

6. The helium compressor with oil cooling motor coil function as claimed in claim 5, wherein: when the oil return port corresponding to the oil distribution passage (15) is positioned at the lower part of the scroll pack shell (9), the oil distribution passage (15) is provided with a one-way valve so as to prevent lubricating oil (32) in the scroll pack shell (9) from flowing back into the oil-gas fine separator (30) through the oil distribution passage (15) in the shutdown process of the helium compressor (1).

7. The helium compressor with oil cooling motor coil function as claimed in claim 1, wherein: the minimum flow of the cooling lubricating oil output by the oil separating passage (15) is determined according to the oil speed generated by the oil separated by the oil-gas fine separator (30).

8. The helium compressor with oil cooling motor coil function as claimed in claim 1 or 7, wherein: the maximum flow of the cooling lubricating oil output by the bypass oil path (21) is determined by the minimum flow required by the oil nozzle oil path (20) for lubricating the bearing (13).

9. The helium compressor with oil cooling motor coil function as claimed in claim 1, wherein: the bypass oil way (21) is provided with a bypass oil saving mechanism (22), and the bypass oil saving mechanism (22) is composed of small holes with variable apertures, so that variable working conditions or variable frequency operation is achieved.

10. A helium compressor with oil cooling motor coil function according to claim 1 or 9, characterized in that: the oil-saving mechanism (4) is arranged on the oil-dividing oil path (15), and the oil-saving mechanism (4) is composed of small holes with variable apertures, so that variable working conditions or variable frequency operation can be achieved.

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