CN112682986B - Flash type oil cooling system and control method - Google Patents
Flash type oil cooling system and control method Download PDFInfo
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- CN112682986B CN112682986B CN202110029982.7A CN202110029982A CN112682986B CN 112682986 B CN112682986 B CN 112682986B CN 202110029982 A CN202110029982 A CN 202110029982A CN 112682986 B CN112682986 B CN 112682986B
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- 238000001816 cooling Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000003507 refrigerant Substances 0.000 claims abstract description 38
- 230000001105 regulatory effect Effects 0.000 claims description 28
- 238000001704 evaporation Methods 0.000 claims description 13
- 230000008020 evaporation Effects 0.000 claims description 13
- 230000001502 supplementing effect Effects 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims 2
- 239000003921 oil Substances 0.000 description 193
- 230000000694 effects Effects 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
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Abstract
The present disclosure provides a flash oil cooling system and a control method, the flash oil cooling system comprising: the device comprises a flash device and an oil heat exchange tube section, wherein a refrigerant can enter the flash device for flash; the oil heat exchange tube section is penetrated in the flash device so as to cool the oil through the refrigerant in the flash device. According to the oil cooling device, 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 running pipeline is greatly reduced in oil cooling resistance relative to the plate-type oil cooler, the pouring quantity relative to the shell-and-tube heat exchanger is also greatly reduced, and meanwhile, the problems of high resistance and high pouring quantity of an oil cooling system are solved.
Description
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 a medium-large air conditioning unit, when the low-temperature refrigeration and high-temperature heating operation are performed, the exhaust temperature of the unit is high, the system oil cooling load is large, an oil cooler is required 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 lubricating oil of the unit are ensured. The problems of the existing oil-cooled heat exchange device are as follows:
the plate-change type oil cooler has large system resistance, and when the low-pressure difference part load is operated, the oil supply pressure difference is insufficient, the oil return quantity of the unit cannot meet the lubrication requirement of the compressor, and the unit cannot normally operate; the oil supply pressure difference of an oil pump or a supercharging device lifting system is usually required to be increased, and a control system is relatively complex;
the shell-and-tube type oil cooling has large volume and large oil storage quantity, a large amount of frozen oil needs to be poured into the unit to maintain the normal oil circulation of the system, and the excessive oil quantity has the effect of blocking the heat exchange of the heat exchange system.
Because the oil cooling system in the prior art can not simultaneously solve the technical problems of high resistance, high filling quantity and the like of the oil cooling system, the invention designs a flash type oil cooling system and a control method.
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, thereby providing a flash type oil cooling system and a control method.
To solve the above-described problems, the present disclosure provides a flash oil cooling system, including:
the device comprises a flash device and an oil heat exchange tube section, wherein a refrigerant can enter the flash device for flash; the oil heat exchange tube section is penetrated in the flash device so as to cool the oil through the refrigerant in the flash device.
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 cooling device comprises an oil heat exchange pipe section, a flash evaporation device, a compressor, a first pipeline, a second pipeline and a third pipeline, wherein the first pipeline is positioned outside the flash evaporation device, one end of the first pipeline is communicated with the other end of the oil heat exchange pipe section, and oil cooled by the flash evaporation device is led into the compressor for oil return.
In some embodiments, the oil heat exchange pipe further comprises a third pipeline, one end of the third pipeline is communicated to the first pipeline, the other end of the third pipeline is communicated to the second pipeline, and the oil heat exchange pipe section can be short-circuited through the third pipeline.
In some embodiments, a control valve is disposed on the first pipeline, the third pipeline intersects the first pipeline at a first intersection point, and the control valve is disposed at a position between the first intersection point and the oil heat exchange pipe 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 pipe, the third pipe intersects the first pipe at a first intersection point, and the first temperature sensor is located at a position upstream of the first intersection point along the oil flow direction;
and a second temperature sensor is further arranged on the second pipeline, the third pipeline is intersected with the second pipeline at a second intersection point, and the second temperature sensor is positioned at a position downstream of the second intersection point along the oil flow direction.
In some embodiments, the oil heat exchange tube segment comprises at least two curved tube segments; 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 arranged on the first pipeline and positioned at the upstream position of the oil filter, and a second stop valve is arranged on the first pipeline and positioned at the downstream position of the oil filter; and/or, the oil filter is also provided with a first vacuumizing valve.
In some embodiments, the flash device further comprises a fourth pipeline and a fifth pipeline, wherein one end of the fourth pipeline is communicated with the inside of the flash device so as to lead out the refrigerant gas in the flash device, and the other end of the fourth pipeline is communicated with a gas supplementing port of the compressor;
one end of the fifth pipeline is communicated to the inside of the flash device so as to lead out liquid refrigerant in the flash device, and the other end of the fifth pipeline can be communicated to the evaporator.
In some embodiments, the fourth pipeline is further provided with a one-way valve which only allows the gas refrigerant in the flash device to flow out, and/or the flash device is further provided with a second vacuumizing valve and a safety valve in a connecting way.
In some embodiments, the flash device further comprises a sixth pipeline, one end of the sixth pipeline is communicated with the inside of the flash device to guide the refrigerant into the inside of the flash device, and a throttling device is arranged on the sixth pipeline.
In some embodiments, the sixth pipeline is further provided with at least one of a third stop valve, a refrigerant filter and a fourth stop valve, and the other end of the sixth pipeline is communicated with the liquid reservoir or the condenser.
The present disclosure provides a control method of a flash oil cooling system as claimed in any one of the preceding claims, when comprising a first temperature sensor and a second temperature sensor, and a control valve and a bypass regulating valve:
a detection step, which is used for detecting the oil cooling inlet pipe temperature T1 detected by the first temperature sensor and detecting the oil supply temperature T2 detected by the second temperature sensor;
a judging step for judging the magnitude relation 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 frozen oil is directly supplied to the compressor without passing through the flash device;
when T1 is more than T2, the control valve is controlled to be opened, and meanwhile, the opening of the bypass regulating valve is regulated, so that 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 provided by the disclosure have the following beneficial effects:
according to the flash evaporation device, the oil heat exchange tube section is arranged in the flash evaporation device in the refrigerant pipeline in a penetrating way, so that the oil heat exchange tube section and the flash evaporation device form a sleeved flash type oil cooling heat exchange device, the oil running pipeline is greatly reduced in oil cooling resistance relative to the plate-type oil cooler, the pouring quantity relative to the shell-and-tube heat exchanger is also greatly reduced, and meanwhile, the problems of high resistance and high pouring quantity of an oil cooling system are solved; the oil temperature T1 entering the flash device can be detected by setting the oil cooling inlet temperature sensor (first temperature sensor), the oil temperature T2 entering the compressor after the flash device comes out can be detected by setting the oil supply temperature sensor (second temperature sensor), whether oil enters the flash device to be cooled or not is controlled according to the temperature between T1 and T2, or the oil quantity entering the flash device is not cooled or the oil quantity entering the flash device is regulated, so that the oil return temperature entering the compressor is accurately controlled, namely, the flash type oil cooling system is adopted to replace a traditional oil cooling control system, a bypass electric control regulating valve and a main solenoid valve are controlled by adopting a fuzzy control algorithm, the accurate control of the oil supply temperature is realized, the air after flash and heat exchange enters the compressor through an air supplementing port, the air supplementing quantity of the system is increased, and the energy efficiency of a unit is improved.
Drawings
Fig. 1 is a system block diagram of a flash oil cooling system of the present disclosure.
The reference numerals are expressed as:
1. a first stop valve; 2. an oil filter; 21. a first vacuum valve; 3. a second shut-off valve; 4. a bypass regulating valve; 5. a flash device; 51. an oil heat exchange tube section; 52. a second vacuumizing valve; 53. a safety valve; 6. a one-way valve; 7. a throttle device; 8. a third stop valve; 9. a refrigerant filter; 10. a fourth shut-off 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, a first intersection point; o2, a second intersection point; 104. a fourth pipeline; 105. a fifth pipeline; 106. and a sixth pipeline.
Detailed Description
As shown in fig. 1, the present disclosure provides a flash oil cooling system comprising:
a flash device 5 and an oil heat exchange tube section 51, wherein the refrigerant can enter the flash device 5 for flash; the oil heat exchange tube section 51 can circulate oil, and the oil heat exchange tube section 51 is arranged inside the flash device 5 in a penetrating way, so that the oil is cooled by the refrigerant in the flash device 5.
This disclosure is through wearing to establish the oil heat transfer pipeline section that sets up in the flash device in the refrigerant pipeline, can make oil heat transfer pipeline section and flash device form and cup joint the cold heat transfer device of flash formula oil, make the oil walk the pipeline, it is for the board oil cooler that the cold resistance of oil is very reduced, because the interval is less between the board of board oil cooler that changes formula oil cooler and the board, lead to its resistance great, and this application intraductal oil of walking, the outside refrigerant of walking of pipe, refrigerant and oil fully exchange heat, the resistance is little), simultaneously solved the big and big problem of filling volume of oil cooling system resistance for shell and tube heat exchanger (the inside oil that lets in of shell and tube heat exchanger's casing, lead to the oil filling volume great, the inside of oil walk the intraduct of this disclosure, effectively reduced the filling volume). The temperature of the refrigerant is lower than the temperature of the frozen oil after being throttled by an electronic expansion valve (throttling device 7) before entering the flash device, the refrigerant can effectively cool the oil, and part of the refrigerant is flashed into low-temperature low-pressure liquid and flows out of the fifth pipeline 105, and the other part of the refrigerant is flashed into gas and flows out of the fourth pipeline 104.
The present disclosure provides a flash type oil cooling system and a control method, which can greatly reduce the resistance of an oil circuit system, reduce the filling amount of a refrigeration oil system, and realize the accurate control of the oil supply temperature under any working condition (the oil supply temperature control here means that the oil supply temperature returned to the inside of a compressor can be accurately controlled). The high-efficiency stable operation of the unit oil cooling system is ensured, and the air supplementing quantity of the system is increased. Meanwhile, the degree of superheat of the air supply is improved, the air supply is avoided from carrying liquid, and the energy efficiency and the reliability of the unit are improved. The invention solves the problems of large resistance and large filling quantity of the oil cooling system, realizes the accurate control of the oil supply temperature under any working condition, and keeps the good lubricating performance of the lubricating oil.
In some embodiments, 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 being in communication with one end of the oil heat exchange pipe section 51, the other end being in communication with the oil separator 14, to suck oil from the oil separator 14;
the flash device further comprises a second pipeline 102, wherein the second pipeline 102 is positioned 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 the oil cooled by the flash device 5 into a compressor for oil return.
The refrigeration oil can be effectively introduced from the oil separator through the first pipeline, and can be introduced into the flash device for cooling; the oil after being cooled 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, the oil heat exchange tube section 51 can be short-circuited by the third pipeline 103, and the third pipeline 103 is further provided with a third pipeline 103, one end of the third pipeline 103 is connected to the first pipeline 101, and the other end of the third pipeline 103 is connected to the second pipeline 102. The oil heat exchange pipe section can be effectively short-circuited through the arrangement of the third pipeline, namely, oil is led into the flash device for effective cooling through the disconnection of the third pipeline when the oil temperature is too high, and is directly led back to the compressor for oil return through the third pipeline when the oil temperature is not high, so that the energy efficiency is effectively improved, and the oil can be prevented from being excessively cooled.
In some embodiments, a control valve 12 is disposed on the first pipeline 101, the third pipeline 103 intersects with the first pipeline 101 at a first intersection point O1, and the control valve 12 is disposed at a position between the first intersection point O1 and the oil heat exchange pipe section 51; the third pipeline 103 is provided with a bypass regulating valve 4. The control valve that still sets up on through first pipeline and the bypass governing valve that sets up on the third pipeline can coordinate each other and control first pipeline to open, third pipeline is closed, or first pipeline is closed, third pipeline is opened, or the aperture that adjusts third pipeline and open in order to effectively adjust the oil mass of first pipeline entering oil in the flash evaporation device, in order to accurate control oil cooled volume, in order to accurate control oil temperature.
In some embodiments, a first temperature sensor 13 is further disposed on the first pipe 101, the third pipe 103 intersects the first pipe 101 at a first intersection point O1, and the first temperature sensor 13 is located at a position upstream of the first intersection point O1 in the oil flow direction;
the second pipeline 102 is further 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 along the oil flow direction.
The oil temperature T1 entering the flash device can be detected by setting the oil cooling inlet temperature sensor (first temperature sensor), the oil temperature T2 entering the compressor after the flash device comes out can be detected by setting the oil supply temperature sensor (second temperature sensor), whether oil enters the flash device to be cooled or not is controlled according to the temperature between T1 and T2, or the oil quantity entering the flash device is not cooled or the oil quantity entering the flash device is regulated, so that the oil return temperature entering the compressor is accurately controlled, namely, the flash type oil cooling system is adopted to replace a traditional oil cooling control system, a bypass electric control regulating valve and a main solenoid valve are controlled by adopting a fuzzy control algorithm, the accurate control of the oil supply temperature is realized, the air after flash and heat exchange enters the compressor through an air supplementing port, the air supplementing quantity of the system is increased, and the energy efficiency of a unit is improved.
In some embodiments, the oil heat exchange tube segment 51 comprises at least two curved tube segments; and/or the first pipeline 101 is provided with an oil filter 2. The heat exchange effect can be improved by bending the pipe section; the oil in the oil heat exchange tube section entering the flash device can be filtered through the oil filter.
In some embodiments, when the oil filter 2 is included:
a first shutoff valve 1 is provided in the first pipe 101 at a position upstream of the oil filter 2, and a second shutoff valve 3 is provided in the first pipe 101 at a position downstream of the oil filter 2; and/or, the oil filter 2 is further provided with a first vacuumizing valve 21. The pipe section at the upstream of the oil filter can be controlled through the first stop valve, the pipe section at the downstream of the oil filter can be controlled through the second stop valve, and the oil filter can be vacuumized through the first vacuuming valve, so that oil can smoothly enter the oil filter from the oil separator.
In some embodiments, the flash device further comprises a fourth pipeline 104 and a fifth pipeline 105, wherein one end of the fourth pipeline 104 is communicated with the inside of the flash device 5 to lead out the refrigerant gas in the flash device 5, and the other end of the fourth pipeline 104 is communicated with a gas supplementing port of the compressor;
one end of the fifth pipe 105 is connected to the inside of the flash device 5 to conduct out the liquid refrigerant inside the flash device 5, and the other end of the fifth pipe 105 can be connected to an evaporator.
The liquid refrigerant that the flash device was flashed can be exported and communicate to the evaporimeter through the fifth pipeline effectively to the gas filling mouth of compressor is exported to the gas that can be effectively flash out in the flash device, forms the effect of flash to can absorb the temperature of oil in the oil heat transfer pipeline section at the in-process of flash, cool down to oil.
In some embodiments, the fourth pipeline 104 is further provided with a one-way valve 6 that only allows the gaseous refrigerant in the flash device 5 to flow out, and/or the flash device 5 is further provided with a second vacuumizing valve 52 and a safety valve 53 in a connecting manner. The air in the air supplementing port of the compressor can be prevented from flowing back into the flash device through the one-way valve arranged on the fourth pipeline, the flash device can be vacuumized through the second vacuumizing valve, so that the refrigerant in the sixth pipeline is sucked into the flash device, and the safety valve is used for pressure relief.
In some embodiments, the flash device further comprises a sixth pipeline 106, one end of the sixth pipeline 106 is connected to the inside of the flash device 5 to guide the refrigerant into the inside of the flash device 5, and the throttling device 7 is disposed on the sixth pipeline 106. The present disclosure also enables efficient channeling of refrigerant from the condenser or accumulator to the flash device through the sixth conduit for efficient flash action.
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 pipe 106, and the other end of the sixth pipe 106 is connected to the accumulator or the condenser 15. The present disclosure also enables a shut-off control action for the sixth pipeline through the third shut-off valve and the fourth shut-off valve.
The present disclosure also provides a control method of the flash oil cooling system according to any one of the preceding claims, wherein when the first and second temperature sensors 13 and 11, and the control valve 12 and the bypass adjustment valve 4 are included:
a detection step, which is used for detecting the oil cooling inlet pipe temperature T1 detected by the first temperature sensor and detecting the oil supply temperature T2 detected by the second temperature sensor;
a judging step for judging the magnitude relation 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 frozen oil is directly supplied to the compressor without passing through the flash device;
when T1 is more than T2, the control valve is controlled to be opened, and meanwhile, the opening of the bypass regulating valve is regulated, so that T2 is controlled within the range of W+/-1 ℃, wherein W is the preset temperature.
The oil temperature T1 entering the flash device can be detected by setting the oil cooling inlet temperature sensor (first temperature sensor), the oil temperature T2 entering the compressor after the flash device comes out can be detected by setting the oil supply temperature sensor (second temperature sensor), whether oil enters the flash device to be cooled or not is controlled according to the temperature between T1 and T2, or the oil quantity entering the flash device is not cooled or the oil quantity entering the flash device is regulated, so that the oil return temperature entering the compressor is accurately controlled, namely, the flash type oil cooling system is adopted to replace a traditional oil cooling control system, a bypass electric control regulating valve and a main solenoid valve are controlled by adopting a fuzzy control algorithm, the accurate control of the oil supply temperature is realized, the air after flash and heat exchange enters the compressor through an air supplementing port, the air supplementing quantity of the system is increased, and the energy efficiency of a unit is improved.
The present disclosure includes a flash type oil cooling heat exchanger, an oil filter 2, a first stop valve 1 and a second stop valve 3 disposed in front of and behind the oil filter 2, an oil path bypass electric control valve (bypass control valve 4), a dry filter (refrigerant filter 9), a third stop valve 8 and a fourth stop valve 10 disposed in front of and behind the dry filter, an electronic expansion valve (throttle device 7), a check valve 6 for air supply, an oil supply temperature sensor (second temperature sensor 11), a main oil path electromagnetic valve (control valve 12) and related maintenance valves, safety valves, connecting pipes, etc.
The refrigerant from the liquid storage device or the condenser is filtered by the drying filter, then enters the flash type oil cooling heat exchange device through throttling of the electronic expansion valve, exchanges heat with the refrigerating oil separated by the oil separator, the cooled refrigerating oil is supplied to the compressor for lubrication, and the refrigerant steam generated by flash and heat exchange returns to the air supplementing port of the compressor through the one-way valve. The liquid after the primary throttling flows back to the evaporation side through the external secondary throttling.
The capacity 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. And controlling the opening and closing of the oil cooling bypass electric valve and the main oil way electromagnetic valve 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 frozen 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 of the bypass electric regulating valve (bypass regulating valve 4) is regulated at the same time, so that the T2 is controlled within the range of W+/-1 ℃;
note that: w is a settable parameter.
The foregoing description of the preferred embodiments of the present disclosure is not intended to limit the disclosure, but is intended to cover any modifications, equivalents, and alternatives falling within the spirit and principles of the present disclosure. The foregoing is merely a preferred embodiment of the present disclosure, and it should be noted that, for a person of ordinary skill in the art, several improvements and modifications can be made without departing from the technical principles of the present disclosure, and these improvements and modifications should also be considered as the protection scope of the present disclosure.
Claims (8)
1. A flash oil cooling system, characterized by: comprising the following steps:
a flash device (5) and an oil heat exchange tube section (51), wherein a refrigerant can enter the flash device (5) for flash; the oil heat exchange tube section (51) can circulate oil, and the oil heat exchange tube section (51) is arranged inside the flash evaporation device (5) in a penetrating way so as to cool the oil through the refrigerant in the flash evaporation device (5);
the oil separator also comprises a first pipeline (101) and an oil separator (14), wherein the first pipeline (101) is positioned outside the flash device (5), one end of the first pipeline (101) is communicated with one end of the oil heat exchange pipe section (51), and the other end of the first pipeline is communicated with the oil separator (14) so as to suck oil from the oil separator (14);
the oil recovery device further comprises a second pipeline (102), wherein the second pipeline (102) is positioned 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 a compressor for oil recovery;
the oil heat exchange pipeline comprises a first pipeline (101), a second pipeline (102) and a third pipeline (103), wherein one end of the third pipeline (103) is communicated to the first pipeline (101), and the other end of the third pipeline (103) is communicated to the second pipeline (102), so that the oil heat exchange pipeline section (51) can be short-circuited through the third pipeline (103);
the first pipeline (101) is provided with a control valve (12), the third pipeline (103) is intersected with 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); a bypass regulating valve (4) is arranged on the third pipeline (103);
the first pipeline (101) is further provided with a first temperature sensor (13), the third pipeline (103) and the first pipeline (101) are intersected at a first intersection point (O1), and the first temperature sensor (13) is located at the upstream position of the first intersection point (O1) along the oil flow direction;
the second pipeline (102) is further provided with a second temperature sensor (11), the third pipeline (103) and the second pipeline (102) are intersected at a second intersection point (O2), and the second temperature sensor (11) is positioned at a position downstream of the second intersection point (O2) along the oil flow direction;
a detection step, which is used for detecting the oil cooling inlet pipe temperature T1 detected by the first temperature sensor and detecting the oil supply temperature T2 detected by the second temperature sensor;
a judging step for judging the magnitude relation 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 frozen oil is directly supplied to the compressor without passing through the flash device;
when T1 is more than T2, the control valve is controlled to be opened, and meanwhile, the opening of the bypass regulating valve is regulated, so that T2 is controlled within the range of W+/-1 ℃, wherein W is the preset temperature.
2. The flash oil cooling system of claim 1, wherein:
the oil heat exchange tube section (51) comprises at least two sections of curved tube sections; and/or the first pipeline (101) is provided with an oil filter (2).
3. The flash oil cooling system of claim 2, wherein:
when comprising an oil filter (2):
a first stop valve (1) is arranged on the first pipeline (101) and positioned at the upstream position of the oil filter (2), and a second stop valve (3) is arranged on the first pipeline (101) and positioned at the downstream position of the oil filter (2); and/or, the oil filter (2) is also provided with a first vacuumizing valve (21).
4. A flash oil cooling system according to any one of claims 1-3, characterized in that:
the device further comprises a fourth pipeline (104) and a fifth pipeline (105), wherein one end of the fourth pipeline (104) is communicated with the inside of the flash device (5) so as to lead out the refrigerant gas in the flash device (5), and the other end of the fourth pipeline (104) is communicated with a gas supplementing port of the compressor;
one end of the fifth pipeline (105) is communicated to the inside of the flash device (5) so as to lead out liquid-state refrigerant in the flash device (5), and the other end of the fifth pipeline (105) can be communicated to an evaporator.
5. The flash oil cooling system of claim 4, 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 connected with a second vacuumizing valve (52) and a safety valve (53).
6. A flash oil cooling system according to any one of claims 1-3, characterized in that:
the flash evaporation device further comprises a sixth pipeline (106), one end of the sixth pipeline (106) is communicated with 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).
7. The flash oil cooling system of claim 6, wherein:
and the sixth pipeline (106) is also provided with at least one of a third stop valve (8), a refrigerant filter (9) and a fourth stop valve (10), and the other end of the sixth pipeline (106) is communicated with the liquid storage device or the condenser (15).
8. A control method of a flash oil cooling system according to any one of claims 1 to 7, characterized in that: a detection step, which is used for detecting the oil cooling inlet pipe temperature T1 detected by the first temperature sensor and detecting the oil supply temperature T2 detected by the second temperature sensor;
a judging step for judging the magnitude relation 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 frozen oil is directly supplied to the compressor without passing through the flash device;
when T1 is more than T2, the control valve is controlled to be opened, and meanwhile, the opening of the bypass regulating valve is regulated, so that T2 is controlled within the range of W+/-1 ℃, wherein W is the preset temperature.
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| CN202110029982.7A CN112682986B (en) | 2021-01-11 | 2021-01-11 | Flash type oil cooling system and control method |
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| CN202110029982.7A CN112682986B (en) | 2021-01-11 | 2021-01-11 | Flash type oil cooling system and control method |
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| CN112682986B true CN112682986B (en) | 2024-03-22 |
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