阅读说明：本技术 一种闪发式油冷系统及控制方法 (Flash type oil cooling system and control method ) 是由 罗炽亮 马宁芳 赵明智 练浩民 于 2021-01-11 设计创作，主要内容包括：本公开提供一种闪发式油冷系统及控制方法,闪发式油冷系统包括：闪发装置和油换热管段,制冷剂能够进入所述闪发装置中进行闪发；所述油换热管段中能够流通油,所述油换热管段穿设于所述闪发装置的内部,以通过所述闪发装置中的制冷剂对油进行冷却降温。根据本公开能够使得油换热管段与闪发装置形成套接闪发式油冷换热装置,使得油走管路,其相对于板换式油冷却器而言油冷阻力大为减小,相对于壳管式换热器的灌注量也大为降低,同时解决了油冷系统阻力大和灌注量大的问题。(The present disclosure provides a flash oil cooling system and a control method, the flash oil cooling system includes: the system comprises a flash device and an oil heat exchange pipe section, wherein refrigerant can enter the flash device for flash evaporation; oil can flow through in the oil heat exchange tube section, oil heat exchange tube section wears to locate the inside of flash device to through refrigerant in the flash device cools off the temperature to oil. According to the shell-and-tube heat exchanger, the oil heat exchange pipe section and the flash device can form the sleeved flash type oil-cooling heat exchanger, so that oil flows through the pipeline, the oil-cooling resistance is greatly reduced relative to the plate-type oil cooler, the filling amount is also greatly reduced relative to the shell-and-tube heat exchanger, and the problems of large resistance and large filling amount of an oil-cooling system are solved.)

1. A flash evaporative oil cooling system, comprising: the method comprises the following steps:

a flash device (5) and an oil heat exchange pipe section (51), wherein refrigerant can enter the flash device (5) for flash evaporation; oil can flow through the oil heat exchange pipe section (51), and the oil heat exchange pipe section (51) is arranged inside the flash device (5) in a penetrating mode so as to cool the oil through the refrigerant in the flash device (5).

2. The flash evaporative oil cooling system of claim 1, wherein:

further comprising a first pipe (101) and an oil separator (14), the first pipe (101) being located outside the flash device (5) and one end of the first pipe (101) communicating with one end of the oil heat exchange pipe section (51) and the other end communicating with the oil separator (14) to suck oil from the oil separator (14);

the oil recovery device further comprises a second pipeline (102), the second pipeline (102) is located outside the flash device (5), and one end of the second pipeline (102) is communicated with the other end of the oil heat exchange pipe section (51) so as to guide oil cooled by the flash device (5) into the compressor for oil return.

3. The flash evaporative oil cooling system of claim 2, wherein:

the oil heat exchange heat pipe is characterized by further comprising a third pipeline (103), one end of the third pipeline (103) is communicated to the first pipeline (101), the other end of the third pipeline is communicated to the second pipeline (102), and the oil heat exchange pipe section (51) can be short-circuited through the third pipeline (103).

4. The flash evaporative oil cooling system of claim 3, wherein:

a control valve (12) is arranged on the first pipeline (101), the third pipeline (103) intersects the first pipeline (101) at a first intersection point (O1), and the control valve (12) is arranged at a position between the first intersection point (O1) and the oil heat exchange pipe section (51); and a bypass regulating valve (4) is arranged on the third pipeline (103).

5. The flash evaporative oil cooling system of any one of claims 2-4, wherein:

a first temperature sensor (13) is further arranged on the first pipeline (101), the third pipeline (103) and the first pipeline (101) intersect at a first intersection point (O1), and the first temperature sensor (13) is positioned at a position upstream of the first intersection point (O1) along the oil flow direction;

the second pipeline (102) is also provided with a second temperature sensor (11), the third pipeline (103) and the second pipeline (102) intersect at a second intersection point (O2), and the second temperature sensor (11) is located at a position downstream of the second intersection point (O2) in the oil flow direction.

6. The flash evaporative oil cooling system of any one of claims 1-5, wherein:

the oil heat exchange pipe section (51) comprises at least two sections of bent pipe sections; and/or an oil filter (2) is arranged on the first pipeline (101).

7. The flash evaporative oil cooling system of claim 6, wherein:

when an oil filter (2) is included:

a first stop valve (1) is arranged on the first pipeline (101) and at the upstream position of the oil filter (2), and a second stop valve (3) is arranged on the first pipeline (101) and at the downstream position of the oil filter (2); and/or a first vacuum pumping valve (21) is also arranged on the oil filter (2).

8. The flash evaporative oil cooling system of any one of claims 1-7, wherein:

the flash evaporation device also comprises a fourth pipeline (104) and a fifth pipeline (105), one end of the fourth pipeline (104) is communicated to the inside of the flash evaporation device (5) to lead out refrigerant gas in the flash evaporation device (5), and the other end of the fourth pipeline (104) is communicated to an air supplement port of the compressor;

one end of the fifth pipeline (105) is communicated to the interior of the flash device (5) to lead out liquid refrigerant in the flash device (5), and the other end of the fifth pipeline (105) can be communicated to an evaporator.

9. The flash evaporative oil cooling system of claim 8, wherein:

the fourth pipeline (104) is also provided with a one-way valve (6) which only allows the gas refrigerant in the flash device (5) to flow out, and/or the flash device (5) is also provided with a second vacuum-pumping valve (52) and a safety valve (53) in a connecting way.

10. The flash evaporative oil cooling system of any one of claims 1-9, wherein:

the flash evaporation device further comprises a sixth pipeline (106), one end of the sixth pipeline (106) is communicated to the inside of the flash evaporation device (5) so as to guide the refrigerant into the inside of the flash evaporation device (5), and a throttling device (7) is arranged on the sixth pipeline (106).

11. The flash evaporative oil cooling system of claim 10, wherein:

at least one of a third stop valve (8), a refrigerant filter (9) and a fourth stop valve (10) is further arranged on the sixth pipeline (106), and the other end of the sixth pipeline (106) is communicated to an accumulator or a condenser (15).

12. A method of controlling a flash evaporative cooling system as defined in any one of claims 1 to 11, wherein: when the first temperature sensor (13) and the second temperature sensor (11), and the control valve (12) and the bypass regulating valve (4) are included:

a detecting step of detecting a temperature T1 of the oil cooling inlet pipe detected by the first temperature sensor and detecting a temperature T2 of the oil supply detected by the second temperature sensor;

a judging step of judging a magnitude relationship between T1 and T2;

a control step, which is used for controlling the control valve to be closed and controlling the bypass regulating valve to be fully opened when T1 is less than or equal to T2, so that the refrigeration oil is directly supplied back to the compressor without passing through the flash device;

when T1 is larger than T2, the control valve is controlled to be opened, and meanwhile, the opening degree of the bypass adjusting valve is adjusted, so that the T2 is controlled within the range of W +/-1 ℃, wherein W is the preset temperature.

Technical Field

The disclosure relates to the technical field of air conditioners, in particular to a flash type oil cooling system and a control method.

Background

For medium and large-sized air conditioning units, when the units run at low-temperature refrigeration and high-temperature heating, the unit exhaust temperature is high, the system oil cooling load is large, an oil cooler needs to be configured, the cooling of lubricating oil is realized, the oil temperature is kept constant, and the viscosity and the lubricating function of the unit lubricating oil are ensured. The problems of the existing oil cooling heat exchange device are as follows:

the plate-exchange type oil cooler has large system resistance, and when the oil cooler runs under the load of a low-pressure-difference part, the oil supply pressure difference is insufficient, and the oil return amount of a unit cannot meet the lubricating requirement of a compressor, so that the unit cannot run normally; an oil pump or a supercharging device is usually required to be added to increase the oil supply pressure difference of a system, and a control system is complex;

the shell and tube type oil cooling system has large volume and large oil storage amount, a large amount of refrigeration oil needs to be filled into the unit to maintain normal oil circulation of the system, and the excessive oil amount has a blocking effect on heat exchange of a heat exchange system.

Because the oil cooling system in the prior art can not solve the technical problems of large resistance, large filling amount and the like of the oil cooling system at the same time, the flash oil cooling system and the control method thereof are researched and designed according to the disclosure.

BRIEF SUMMARY OF THE PRESENT DISCLOSURE

Therefore, the technical problem to be solved by the present disclosure is to overcome the defect that the oil cooling system in the prior art cannot simultaneously solve the problems of large resistance and large filling amount of the oil cooling system, so as to provide a flash evaporation type oil cooling system and a control method.

In order to solve the above problems, the present disclosure provides a flash type oil cooling system, including:

the system comprises a flash device and an oil heat exchange pipe section, wherein refrigerant can enter the flash device for flash evaporation; oil can flow through in the oil heat exchange tube section, oil heat exchange tube section wears to locate the inside of flash device to through refrigerant in the flash device cools off the temperature to oil.

In some embodiments, the flash device further comprises a first pipeline and an oil separator, wherein the first pipeline is positioned outside the flash device, one end of the first pipeline is communicated with one end of the oil heat exchange pipe section, and the other end of the first pipeline is communicated with the oil separator so as to suck oil from the oil separator;

the oil heat exchange pipe section is arranged on the outer side of the flash device, and one end of the second pipeline is communicated with the other end of the oil heat exchange pipe section so as to guide oil cooled by the flash device into the compressor for oil return.

In some embodiments, the oil heat exchange tube section is connected to the first tube section at one end and to the second tube section at the other end, and the oil heat exchange tube section is short-circuited through the third tube section.

In some embodiments, a control valve is disposed on the first conduit, the third conduit intersects the first conduit at a first intersection point, and the control valve is disposed at a location between the first intersection point and the oil heat exchange tube section; and a bypass regulating valve is arranged on the third pipeline.

In some embodiments, a first temperature sensor is further disposed on the first pipeline, the third pipeline intersects the first pipeline at a first intersection point, and the first temperature sensor is located upstream of the first intersection point in the oil flow direction;

and a second temperature sensor is also arranged on the second pipeline, the third pipeline and the second pipeline are intersected at a second intersection point, and the second temperature sensor is positioned at the downstream position of the second intersection point along the oil flowing direction.

In some embodiments, the oil heat exchange tube section comprises at least two curved tube sections; and/or an oil filter is arranged on the first pipeline.

In some embodiments, when an oil filter is included:

a first stop valve is provided in the first pipe at a position upstream of the oil filter, and a second stop valve is provided in the first pipe at a position downstream of the oil filter; and/or a first vacuum pumping valve is also arranged on the oil filter.

In some embodiments, the flash device further comprises a fourth pipeline and a fifth pipeline, one end of the fourth pipeline is communicated to the interior of the flash device to lead out refrigerant gas in the interior of the flash device, and the other end of the fourth pipeline is communicated to a gas supplementing port of the compressor;

one end of the fifth pipeline is communicated to the interior of the flash device to lead out the liquid refrigerant in the flash device, and the other end of the fifth pipeline can be communicated to the evaporator.

In some embodiments, a check valve is further disposed on the fourth pipeline to allow only the gaseous refrigerant in the flash device to flow out, and/or a second vacuum-pumping valve and a safety valve are further disposed on the flash device in a connecting manner.

In some embodiments, the flash device further comprises a sixth pipeline, one end of the sixth pipeline is communicated to the inside of the flash device to guide the refrigerant into the inside of the flash device, and the sixth pipeline is provided with a throttling device.

In some embodiments, at least one of a third stop valve, a refrigerant filter and a fourth stop valve is further disposed on the sixth pipeline, and the other end of the sixth pipeline is communicated to an accumulator or a condenser.

The present disclosure is a control method of a flash type oil cooling system as set forth in any one of the preceding claims, when including the first and second temperature sensors, and the control valve and the bypass regulating valve:

a detecting step of detecting a temperature T1 of the oil cooling inlet pipe detected by the first temperature sensor and detecting a temperature T2 of the oil supply detected by the second temperature sensor;

a judging step of judging a magnitude relationship between T1 and T2;

a control step, which is used for controlling the control valve to be closed and controlling the bypass regulating valve to be fully opened when T1 is less than or equal to T2, so that the refrigeration oil is directly supplied back to the compressor without passing through the flash device;

when T1 is larger than T2, the control valve is controlled to be opened, and meanwhile, the opening degree of the bypass adjusting valve is adjusted, so that the T2 is controlled within the range of W +/-1 ℃, wherein W is the preset temperature.

The flash type oil cooling system and the control method have the following beneficial effects:

according to the flash device, the oil heat exchange pipe section is arranged in the flash device in the refrigerant pipeline in a penetrating mode, the oil heat exchange pipe section and the flash device can form a sleeved flash type oil-cooling heat exchange device, so that the oil cooling resistance of the oil walking pipeline is greatly reduced compared with that of a plate type oil cooler, the filling amount of the oil walking pipeline is also greatly reduced compared with that of a shell and tube heat exchanger, and the problems of large resistance and large filling amount of an oil cooling system are solved; the present disclosure can also detect the oil temperature T1 entering the flash apparatus by providing an oil cooling inlet temperature sensor (first temperature sensor), and can detect the oil temperature T2 entering the compressor after the flash apparatus exits by providing an oil supply temperature sensor (second temperature sensor), and whether the oil enters the flash device to be cooled is controlled according to the temperature between T1 and T2, or the oil does not pass through the flash device for cooling, or the oil quantity entering the flash device is adjusted so as to accurately control the oil temperature of return oil entering the compressor, this is disclosed promptly and adopts a flash type oil cooling system to replace traditional oil cooling control system, adopts fuzzy control algorithm control bypass automatically controlled governing valve and main road solenoid valve, realizes the accurate control to fuel feeding temperature, and the gas after flash type and the heat transfer gets into the compressor through the tonifying qi mouth, increases system's tonifying qi volume, improves the unit efficiency.

Drawings

FIG. 1 is a system block diagram of a flash evaporative oil cooling system of the present disclosure.

The reference numerals are represented as:

1. a first shut-off valve; 2. an oil filter; 21. a first vacuum-pumping valve; 3. a second stop valve; 4. a bypass regulating valve; 5. a flash device; 51. an oil heat exchange pipe section; 52. a second vacuum valve; 53. a safety valve; 6. a one-way valve; 7. a throttling device; 8. a third stop valve; 9. a refrigerant filter; 10. a fourth stop valve; 11. a second temperature sensor; 12. a control valve; 13. a first temperature sensor; 14. an oil separator; 15. a reservoir or condenser; 101. a first pipeline; 102. a second pipeline; 103. a third pipeline; o1, first intersection; o2, second intersection; 104. a fourth pipeline; 105. a fifth pipeline; 106. a sixth pipeline.

Detailed Description

As shown in fig. 1, the present disclosure provides a flash type oil cooling system, comprising:

a flash device 5 and an oil heat exchange pipe section 51, wherein the refrigerant can enter the flash device 5 for flash evaporation; the oil heat exchange pipe section 51 can be communicated with oil, and the oil heat exchange pipe section 51 is arranged inside the flash device 5 in a penetrating mode so as to cool the oil through the refrigerant in the flash device 5.

This is disclosed through wear to establish the oily heat transfer pipe section in the flash device in the refrigerant pipeline, can make oily heat transfer pipe section and flash device form and cup joint flash type oil-cooled heat transfer device, make the oil walk the pipeline, it is for the plate oil cooler oil-cooling resistance greatly reduces (because the interval is less between the board of plate oil cooler and the board, lead to its resistance great, and this application is walked oil in the pipe, the refrigerant is walked to the outside of tubes portion, refrigerant and oil fully exchange heat, the resistance is little a lot of), solved the big problem with the filling volume of oily cold system resistance for shell and tube heat exchanger simultaneously (the inside oil that lets in of shell and tube heat exchanger's casing, lead to oil filling volume great, inside this disclosed oil walks intraductal, effectively reduced the filling volume). The refrigerant is throttled by the electronic expansion valve (throttle device 7) before entering the flash device, has a temperature lower than that of the refrigeration oil, can effectively cool the oil, is partially divided into low-temperature and low-pressure liquid by flash and flows out of the fifth pipeline 105, and is partially flashed into gas and flows out of the fourth pipeline 104.

The invention provides a flash type oil cooling system and a control method thereof, which can greatly reduce the resistance of an oil way system, reduce the filling amount of a refrigerating oil system and realize the accurate control of the oil supply temperature under any working condition (the oil supply temperature control refers to the accurate control of the oil supply temperature returned to the inside of a compressor). The high-efficiency and stable operation of the unit oil cooling system is ensured, and the air supplement amount of the system is increased. Meanwhile, the air supplementing superheat degree is improved, air supplementing liquid is avoided, and the energy efficiency and the reliability of the unit are improved. The invention solves the problem of large resistance and filling amount of the oil cooling system, realizes accurate control of oil supply temperature under any working condition, and keeps good lubricating performance of lubricating oil.

In some embodiments, a first pipeline 101 and an oil separator 14 are further included, the first pipeline 101 is located outside the flash device 5, and one end of the first pipeline 101 is communicated with one end of the oil heat exchange pipe section 51, and the other end is communicated with the oil separator 14, so as to suck oil from the oil separator 14;

the oil return device further comprises a second pipeline 102, the second pipeline 102 is located outside the flash device 5, one end of the second pipeline 102 is communicated with the other end of the oil heat exchange pipe section 51, and oil cooled by the flash device 5 is guided into the compressor to return.

The first pipeline can effectively introduce the refrigeration oil from the oil separator, and the refrigeration oil can be introduced into the flash device for cooling; the oil cooled down can be guided into the compressor through the second pipeline to form oil return, so that the oil temperature is effectively reduced and the oil return effect is achieved.

In some embodiments, a third pipeline 103 is further included, one end of the third pipeline 103 is connected to the first pipeline 101, and the other end is connected to the second pipeline 102, and the oil heat exchange pipe section 51 can be short-circuited through the third pipeline 103. This is disclosed still can carry out the short circuit effect to oil heat exchange tube section effectively through the setting of third pipeline, and the disconnection leads oil into the flash device through the third pipeline and carries out effectual cooling promptly when the oil temperature is too high, then directly leads it back to the compressor through the third pipeline and carries out the oil return when the oil temperature is not high, has improved the efficiency effectively, also can prevent that oil from being cooled off excessively.

In some embodiments, a control valve 12 is disposed on the first pipe 101, the third pipe 103 intersects the first pipe 101 at a first intersection O1, and the control valve 12 is disposed at a position between the first intersection O1 and the oil heat exchange pipe section 51; a bypass regulating valve 4 is arranged on the third pipeline 103. The control valve arranged on the first pipeline and the bypass adjusting valve arranged on the third pipeline can be used for controlling the first pipeline to be opened and the third pipeline to be closed in a mutually coordinated mode, or the first pipeline is closed and the third pipeline is opened, or the opening degree of the third pipeline is adjusted, so that the oil quantity of oil entering the flash device through the first pipeline is effectively adjusted, the cooling quantity of the oil is accurately controlled, and the oil temperature is accurately controlled.

In some embodiments, a first temperature sensor 13 is further disposed on the first pipeline 101, the third pipeline 103 intersects the first pipeline 101 at a first intersection O1, and the first temperature sensor 13 is located upstream of the first intersection O1 in the oil flow direction;

the second pipe 102 is also provided with a second temperature sensor 11, the third pipe 103 intersects the second pipe 102 at a second intersection O2, and the second temperature sensor 11 is located downstream of the second intersection O2 in the oil flow direction.

The present disclosure can also detect the oil temperature T1 entering the flash apparatus by providing an oil cooling inlet temperature sensor (first temperature sensor), and can detect the oil temperature T2 entering the compressor after the flash apparatus exits by providing an oil supply temperature sensor (second temperature sensor), and whether the oil enters the flash device to be cooled is controlled according to the temperature between T1 and T2, or the oil does not pass through the flash device for cooling, or the oil quantity entering the flash device is adjusted so as to accurately control the oil temperature of return oil entering the compressor, this is disclosed promptly and adopts a flash type oil cooling system to replace traditional oil cooling control system, adopts fuzzy control algorithm control bypass automatically controlled governing valve and main road solenoid valve, realizes the accurate control to fuel feeding temperature, and the gas after flash type and the heat transfer gets into the compressor through the tonifying qi mouth, increases system's tonifying qi volume, improves the unit efficiency.

In some embodiments, the oil heat exchange tube section 51 comprises at least two sections of curved tube sections; and/or an oil filter 2 is arranged on the first pipeline 101. The heat exchange effect can be improved by bending the pipe section; the oil filter can filter the oil entering the oil heat exchange section of the flash device.

In some embodiments, when the oil filter 2 is included:

a first shutoff valve 1 is provided in the first pipeline 101 at a position upstream of the oil filter 2, and a second shutoff valve 3 is provided in the first pipeline 101 at a position downstream of the oil filter 2; and/or a first vacuum-pumping valve 21 is arranged on the oil filter 2. Can control the pipeline section of oil filter upper reaches through first stop valve, can control the pipeline section of oil filter low reaches through the second stop valve, can carry out the evacuation to the oil filter through first evacuation valve to make oil can follow the oil separator smoothly and get into in the oil filter.

In some embodiments, a fourth pipeline 104 and a fifth pipeline 105 are further included, one end of the fourth pipeline 104 is communicated to the inside of the flash device 5 to lead out the refrigerant gas inside the flash device 5, and the other end of the fourth pipeline 104 is communicated to a gas supplementing port of the compressor;

one end of the fifth pipeline 105 is communicated to the inside of the flash device 5 to lead out the liquid refrigerant inside the flash device 5, and the other end of the fifth pipeline 105 can be communicated to the evaporator.

This is disclosed still can be effectively derive the gas that flashes in the flash device to the tonifying qi mouth of compressor through the fourth pipeline, can derive the liquid refrigerant that flashes in the flash device effectively through the fifth pipeline and communicate to the evaporimeter in, form the effect of flash to can absorb the temperature of the oil in the oil heat transfer pipe section at the in-process of flash, cool off the oil.

In some embodiments, the fourth line 104 is further provided with a one-way valve 6 allowing only the outflow of the gaseous refrigerant from the flash apparatus 5, and/or the flash apparatus 5 is further provided with a second evacuation valve 52 and a safety valve 53 connected thereto. This disclosure still can prevent through the check valve that sets up on the fourth pipeline that the gas in the compressor tonifying qi mouth from flowing back to the flash device, can carry out the evacuation effect to the flash device through the second evacuation valve to in getting into the flash device with the refrigerant suction in the sixth pipeline, the relief valve is used for the pressure release effect.

In some embodiments, the flash evaporator further comprises a sixth pipeline 106, one end of the sixth pipeline 106 is communicated to the inside of the flash device 5 to introduce the refrigerant into the inside of the flash device 5, and the throttle device 7 is arranged on the sixth pipeline 106. The refrigerant can be effectively guided out of the condenser or the liquid accumulator to the flash device through the sixth pipeline so as to perform the function of effective flash.

In some embodiments, at least one of the third stop valve 8, the refrigerant filter 9 and the fourth stop valve 10 is further disposed on the sixth pipeline 106, and the other end of the sixth pipeline 106 is communicated to the accumulator or condenser 15. This disclosure still can carry out the stop control effect to the sixth pipeline through third stop valve and fourth stop valve.

The present disclosure also provides a control method of a flash type oil cooling system as described in any one of the preceding items, wherein when the first and second temperature sensors 13 and 11, and the control valve 12 and the bypass regulating valve 4 are included:

a detecting step of detecting a temperature T1 of the oil cooling inlet pipe detected by the first temperature sensor and detecting a temperature T2 of the oil supply detected by the second temperature sensor;

a judging step of judging a magnitude relationship between T1 and T2;

a control step, which is used for controlling the control valve to be closed and controlling the bypass regulating valve to be fully opened when T1 is less than or equal to T2, so that the refrigeration oil is directly supplied back to the compressor without passing through the flash device;

when T1 is larger than T2, the control valve is controlled to be opened, and meanwhile, the opening degree of the bypass adjusting valve is adjusted, so that the T2 is controlled within the range of W +/-1 ℃, wherein W is the preset temperature.

The present disclosure can also detect the oil temperature T1 entering the flash apparatus by providing an oil cooling inlet temperature sensor (first temperature sensor), and can detect the oil temperature T2 entering the compressor after the flash apparatus exits by providing an oil supply temperature sensor (second temperature sensor), and whether the oil enters the flash device to be cooled is controlled according to the temperature between T1 and T2, or the oil does not pass through the flash device for cooling, or the oil quantity entering the flash device is adjusted so as to accurately control the oil temperature of return oil entering the compressor, this is disclosed promptly and adopts a flash type oil cooling system to replace traditional oil cooling control system, adopts fuzzy control algorithm control bypass automatically controlled governing valve and main road solenoid valve, realizes the accurate control to fuel feeding temperature, and the gas after flash type and the heat transfer gets into the compressor through the tonifying qi mouth, increases system's tonifying qi volume, improves the unit efficiency.

The utility model discloses a contain a flash type oil-cooling heat transfer device, an oil filter 2, oil filter 2 front and back configuration first stop valve 1 and second stop valve 3, an oil circuit bypass electrical control valve (bypass governing valve 4), a drier-filter (refrigerant filter 9), third stop valve 8 and fourth 10 after the drier-filter front configuration, an electronic expansion valve (throttling set 7), a check valve 6 of tonifying qi, an oil supply temperature sensor (second temperature sensor 11), a main oil circuit solenoid valve (control valve 12) and relevant service valve, the relief valve, connecting line etc. constitute.

Refrigerant from a liquid storage device or a condenser is filtered by a drying filter, throttled by an electronic expansion valve and enters a flash type oil-cooling heat exchange device to exchange heat with the refrigeration oil separated by the oil separator, the cooled refrigeration oil is supplied for lubricating a compressor, and refrigerant steam generated by flash and heat exchange returns to an air supplement port of the compressor through a one-way valve. The liquid after the primary throttling returns to the evaporation side through external secondary throttling.

The volume and the heat exchange area of the flash type heat exchange device are designed and calculated according to different system sizes, and stable operation of the unit under the limit working condition is required to be met. The opening and closing of the oil-cooling bypass electric valve and the main oil way electromagnetic valve are controlled by detecting the oil supply temperature T2 of the oil supply main pipe and the oil cooling inlet pipe temperature T1. The oil supply temperature T2 of the oil supply main pipe is controlled at W +/-1 ℃:

when T1 is less than or equal to T2, the main solenoid valve (control valve 12) is closed, the bypass electric regulating valve (bypass regulating valve 4) is fully opened, and the refrigeration oil is directly supplied back to the compressor without passing through the flash heat exchange system;

when T1 is more than T2, the main solenoid valve (control valve 12) is opened, and the opening degree of the bypass electric regulating valve (bypass regulating valve 4) is regulated to ensure that T2 is controlled within the range of W +/-1 ℃;

note: w is a settable parameter.

The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure. The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present disclosure, and these modifications and variations should also be regarded as the protection scope of the present disclosure.