CN216132128U - Two-stage matched compression refrigeration system of screw unit - Google Patents
Two-stage matched compression refrigeration system of screw unit Download PDFInfo
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- CN216132128U CN216132128U CN202122734099.6U CN202122734099U CN216132128U CN 216132128 U CN216132128 U CN 216132128U CN 202122734099 U CN202122734099 U CN 202122734099U CN 216132128 U CN216132128 U CN 216132128U
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Abstract
The utility model relates to a two-stage matched compression refrigeration system of a screw unit, which comprises a low-temperature screw compressor unit, a high-temperature screw compressor unit, double-layer oil components, a first gas-liquid separator and a liquid storage device, wherein the low-temperature screw compressor unit is provided with a low-temperature exhaust pipeline, the high-temperature screw compressor unit is provided with a high-temperature air suction pipeline and a high-temperature exhaust pipeline, the low-temperature exhaust pipeline, the high-temperature air suction pipeline and the high-temperature exhaust pipeline are respectively connected with the double-layer oil components, the double-layer oil components form heat exchange circulation with the first gas-liquid separator through oil-cold plate exchange, so that oil of the double-layer oil components are respectively the low-temperature screw compressor unit and the high-temperature screw compressor unit, the first gas-liquid separator is provided with a first oil supply pipeline, and the first liquid supply pipeline is connected with the liquid storage device. The utility model adopts two-stage compression circulation and multi-stage energy adjustment to ensure that the coefficient of performance coefficient COP of the quick-freezing system is always highest, the refrigeration efficiency is high, the electricity-saving performance is obvious, the number of easily-damaged parts of the screw compressor unit is small, and the service life of the compressor is prolonged.
Description
Technical Field
The utility model relates to the technical field of refrigeration, in particular to a two-stage matched compression refrigeration system of a screw unit.
Background
At present, the quick-freezing screw rod parallel unit in the same field generally only adopts a single-machine low-temperature screw rod parallel unit, and the unit has low refrigeration efficiency, large temperature change and large load change of quick-freezing working conditions. And the low-temperature screw unit has low refrigeration coefficient, low refrigeration efficiency, high power consumption and high operation cost under the high-temperature working condition.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a two-stage matched compression refrigeration system of a screw unit so as to solve the problems in the background technology.
The utility model provides a two-stage matched compression refrigeration system of a screw unit, which comprises a low-temperature screw compressor unit, a high-temperature screw compressor unit, double-layer oil components, a first gas-liquid separator and a liquid storage device, wherein the low-temperature screw compressor unit is provided with a low-temperature exhaust pipeline, the high-temperature screw compressor unit is provided with a high-temperature air suction pipeline and a high-temperature exhaust pipeline, the low-temperature exhaust pipeline, the high-temperature air suction pipeline and the high-temperature exhaust pipeline are respectively connected with the double-layer oil components, the double-layer oil components form heat exchange circulation with the first gas-liquid separator through oil-cold plate exchange, so that oil of the double-layer oil components respectively supplies oil to the low-temperature screw compressor unit and the high-temperature screw compressor unit, the first gas-liquid separator is provided with a first liquid supply pipeline, and the first liquid supply pipeline is connected with the liquid storage device.
Preferably, the low-temperature exhaust pipeline and the high-temperature air suction pipeline are respectively connected with the lower layer of the double-layer oil content, the high-temperature exhaust pipeline is connected with the upper layer of the double-layer oil content, and an exhaust pipeline is arranged at the top of the double-layer oil content.
It is preferable in any above-mentioned scheme that the first import that the oil cold plate traded is connected with the lower floor of double-deck oil content, the first export that the oil cold plate traded is connected with low temperature oil supply pipeline and first high temperature oil supply pipeline respectively, connect gradually between the liquid outlet of first gas-liquid separator, the second import that the oil cold plate traded, the second export that the oil cold plate traded and the air inlet of first gas-liquid separator and form circulation circuit, low temperature oil supply pipeline locates on the low temperature screw compressor unit, first high temperature oil supply pipeline locates on the high temperature screw compressor unit.
In any one of the above schemes, preferably, the upper layer of the double-layer oil content is further connected with a second high-temperature oil supply pipeline, and the second high-temperature oil supply pipeline is arranged on the high-temperature screw compressor unit and is connected in parallel with the first high-temperature oil supply pipeline.
Preferably, in any of the above schemes, the system further comprises a second gas-liquid separator and an intermediate cooling plate exchanger, the second gas-liquid separator is connected with the first gas-liquid separator through a second liquid supply pipeline, the second gas-liquid separator forms a heat exchange cycle with the liquid reservoir through the intermediate cooling plate exchanger, a first inlet of the intermediate cooling plate exchanger is connected with a liquid outlet of the liquid reservoir, a first outlet of the intermediate cooling plate exchanger is connected with the high-temperature air suction pipeline, a liquid outlet of the second gas-liquid separator, a second inlet of the intermediate cooling plate exchanger, a second outlet of the intermediate cooling plate exchanger and an air inlet of the second gas-liquid separator are sequentially connected to form a circulation loop, and an air outlet of the second gas-liquid separator is connected with the high-temperature air suction pipeline.
In any of the above schemes, preferably, a stop valve, an electromagnetic valve and a thermostatic expansion valve are sequentially arranged between the first outlet of the middle cooling plate and the high temperature air suction pipeline.
Preferably, in any of the above schemes, the cold plate heat exchanger further comprises a third gas-liquid separator and a cold plate exchanger, the third gas-liquid separator is connected with the first gas-liquid separator through a third liquid supply pipeline, a first inlet of the cold plate exchanger is connected with a liquid outlet of the liquid reservoir, a first outlet of the cold plate exchanger is connected with a terminal system, a second inlet of the cold plate exchanger is connected with a liquid outlet of the third gas-liquid separator, a second outlet of the cold plate exchanger is connected with a low-temperature gas suction pipeline, and the low-temperature gas suction pipeline is arranged on the low-temperature screw compressor unit.
Preferably, in any of the above schemes, the cold plate exchanger further comprises an economizer over-cooling plate exchanger, a first inlet of the economizer over-cooling plate exchanger is connected with a first outlet of the middle cooling plate exchanger, a first outlet of the economizer over-cooling plate exchanger is connected with a terminal system, a second inlet of the economizer over-cooling plate exchanger is connected with a liquid outlet of a third gas-liquid separator, a second outlet of the economizer over-cooling plate exchanger is connected with a low-temperature gas supplementing pipeline through the third gas-liquid separator, and the low-temperature gas supplementing pipeline is arranged on the low-temperature screw compressor unit.
Preferably, in any one of the above schemes, the defrosting system further comprises a defrosting system, the defrosting system comprises a first defrosting pipeline and a second defrosting pipeline, one end of the first defrosting pipeline is connected with the lower layer of the double-layer oil component, the other end of the first defrosting pipeline is connected with one end of the condensing coil, one end of the second defrosting pipeline is connected with the other end of the condensing coil, and the other end of the second defrosting pipeline is connected with the liquid inlet of the first gas-liquid separator.
In any of the above embodiments, preferably, a buffer tank is provided on the second defrosting pipe.
Compared with the prior art, the utility model has the advantages and beneficial effects that:
1. by adopting double-stage compression circulation, compared with a low-temperature screw compressor unit with a single economizer, the multi-stage energy regulation ensures that the COP (coefficient of performance) of the quick-freezing system is always highest, the refrigerating efficiency is improved by 61 percent, the electricity-saving performance is obvious, the screw compressor unit has few easily-damaged parts and long maintenance period, and the service life of the compressor is greatly prolonged.
2. The two-stage matching and matching compression refrigeration system is a special quick-freezing refrigeration unit completely designed for a quick-freezing working condition, aiming at the characteristics of large temperature change and large load change of the quick-freezing working condition, the intermediate temperature of the two-stage matching and matching refrigeration unit is automatically increased according to the terminal load at the initial high warehouse temperature, and the COP value reaches the highest value under the evaporation temperature; after the reservoir temperature is reduced, the intermediate temperature automatically decreases, and the COP value still maintains the maximum value at the new evaporation temperature.
In addition, the high temperature screw rod unit is adopted to the doublestage joining in marriage the unit in the earlier stage, and the mode that low temperature screw rod unit and high temperature screw rod unit mutually supported is adopted in the later stage, realizes cascaded cooling, directly adopts low temperature screw rod unit cooling to compare with current, can realize rapid cooling, and reduce the consumption.
The two-stage match compression refrigeration system of the screw machine set is further explained with reference to the attached drawings.
Drawings
FIG. 1 is a working schematic diagram of a two-stage matched compression refrigeration system of a screw unit according to the present invention;
wherein: 1. a low temperature screw compressor unit; 2. a low temperature exhaust line; 3. double-layer oil content; 4. an exhaust line; 5. a high temperature suction line; 6. a high temperature screw compressor unit; 7. a high temperature exhaust line; 8. oil cooling plate replacement; 9. a first gas-liquid separator; 10. a second gas-liquid separator; 11. a third gas-liquid separator; 12. a reservoir; 13. replacing a medium-cooling plate; 14. replacing the over-cooling plate; 15. exchanging an economizer supercooling plate; 16. a first liquid supply line; 17. a second liquid supply line; 18. a third liquid supply line; 19. a low temperature oil supply line; 20. a first high temperature oil supply line; 21. a second high temperature oil supply line; 22. a middle suction line; 23. a stop valve; 24. an electromagnetic valve; 25. a thermostatic expansion valve; 26. a low temperature getter line; 27. a low temperature gas supply line; 28. a first defrosting pipe; 29. a second defrosting pipeline; 30. and a buffer tank.
Detailed Description
As shown in fig. 1, the present invention provides a two-stage matched compression refrigeration system for screw units, which includes a low-temperature screw compressor unit 1, a high-temperature screw compressor unit 6, a double-layer oil component 3, a first gas-liquid separator 9 and a liquid reservoir 12, wherein the low-temperature screw compressor unit 1 includes a plurality of low-temperature screw compressors arranged in parallel, and the high-temperature screw compressor unit 6 includes a plurality of high-temperature screw compressors arranged in parallel.
Low temperature screw compressor unit 1 is equipped with low temperature exhaust pipe way 2, and high temperature screw compressor unit 6 is equipped with high temperature pipeline 5, high temperature exhaust pipe 7 of breathing in, and low temperature exhaust pipe 2, high temperature pipeline 5 and high temperature exhaust pipe 7 are connected with double-deck oil content 3 respectively, and double-deck oil content 3 trades through the oil-cooling board and constitutes heat exchange circulation between 8 and the first vapour and liquid separator 9, makes double-deck oil content 3's fluid do respectively low temperature screw compressor unit 1 and the 6 fuel feeding of high temperature screw compressor unit are equipped with first feed liquid pipeline 16 on the first vapour and liquid separator 9, and first feed liquid pipeline 16 is connected with reservoir 12.
Wherein, low temperature exhaust pipe 2 and high temperature suction pipe 5 are connected with the lower floor of double-deck oil content 3 respectively, and high temperature exhaust pipe 7 is connected with the upper floor of double-deck oil content 3, and the top of double-deck oil content 3 is equipped with exhaust pipe 4.
The first import that the oil cold plate traded 8 is connected with the lower floor of double-deck oil content 3, the first export that the oil cold plate traded 8 supplies oil pipe way 19 and first high temperature respectively to be connected, the liquid outlet of first vapour and liquid separator 9, the second import that the oil cold plate traded 8, the oil cold plate trades and connects gradually between the second export of 8 and the air inlet of first vapour and liquid separator 9 and forms circulation circuit, low temperature supplies oil pipe way 19 to locate on low temperature screw compressor unit 1, first high temperature supplies oil pipe way 20 to locate on high temperature screw compressor unit 6.
The upper layer of the double-layer oil content 3 is also connected with a second high-temperature oil supply pipeline 21, and the second high-temperature oil supply pipeline 21 is arranged on the high-temperature screw compressor unit 6 and is connected with the first high-temperature oil supply pipeline 20 in parallel.
The heat exchanger further comprises a second gas-liquid separator 10 and a middle cold plate exchanger 13, the second gas-liquid separator 10 is connected with the first gas-liquid separator 9, the second gas-liquid separator 10 forms heat exchange circulation between the middle cold plate exchanger 13 and the liquid reservoir 12, a first inlet of the middle cold plate exchanger 13 is connected with a liquid outlet of the liquid reservoir 12, a first outlet of the middle cold plate exchanger 13 is connected with the high-temperature air suction pipeline 5 through a middle air suction pipeline 22, a liquid outlet of the second gas-liquid separator 10, a second inlet of the middle cold plate exchanger 13, a second outlet of the middle cold plate exchanger 13 and an air inlet of the second gas-liquid separator 10 are sequentially connected to form a circulation loop, and an air outlet of the second gas-liquid separator 10 is connected with the high-temperature air suction pipeline 5.
A stop valve 23, an electromagnetic valve 24 and a thermal expansion valve 25 are sequentially arranged on a pipeline between the first outlet of the intermediate cooling plate exchanger 13 and the high-temperature air suction pipeline 5, namely the intermediate air suction pipeline 22.
The cold-storage type screw compressor further comprises a third gas-liquid separator 11 and a cold-passing plate exchanger 14, wherein the third gas-liquid separator 11 is connected with the first gas-liquid separator 9, a first inlet of the cold-passing plate exchanger 14 is connected with a liquid outlet of the liquid reservoir 12, a first outlet of the cold-passing plate exchanger 14 is connected with a tail end system, a second inlet of the cold-passing plate exchanger 14 is connected with a liquid outlet of the third gas-liquid separator 11, a second outlet of the cold-passing plate exchanger 14 is connected with a low-temperature gas absorption pipeline 26, and the low-temperature gas absorption pipeline 26 is arranged on the low-temperature screw compressor unit 1.
The cold plate exchanger further comprises an economizer supercooling plate exchanger 15, a first inlet of the economizer supercooling plate exchanger 15 is connected with a first outlet of the middle cooling plate exchanger 13, a first outlet of the economizer supercooling plate exchanger 15 is connected with a terminal system, a second inlet of the economizer supercooling plate exchanger 15 is connected with a liquid outlet of the third gas-liquid separator 11, a second outlet of the economizer supercooling plate exchanger 15 is connected with the low-temperature gas supplementing pipeline 27 through the third gas-liquid separator 11, and the low-temperature gas supplementing pipeline 27 is arranged on the low-temperature screw compressor unit 1.
The defrosting device further comprises a defrosting system, the defrosting system comprises a first defrosting pipeline 28 and a second defrosting pipeline 29, one end of the first defrosting pipeline 28 is connected with the lower layer of the double-layer oil component 3, the other end of the first defrosting pipeline 28 is connected with one end of the condensing coil, one end of the second defrosting pipeline 29 is connected with the other end of the condensing coil, and the other end of the second defrosting pipeline 29 is connected with a liquid inlet of the first gas-liquid separator 9.
A buffer tank 30 is arranged on the second defrosting pipeline 29.
The working principle of the two-stage match compression refrigeration system of the screw unit is explained in detail below.
One, two stage compression cycle
The exhaust that comes out from low temperature screw compressor unit 1 gets into the lower floor of double-deck oil content 3 through low temperature exhaust pipe 2, comes out from the lower floor top again and passes upper oil content, and the middling pressure gas that comes out from the upper oil content side gets into high temperature suction pipe 5, the induction port that gets into high temperature screw compressor unit 6 through high temperature suction pipe 5, the high temperature high pressure gas that comes out from high temperature screw compressor unit 6 gets into the side entering of double-deck oil content 3 upper strata through high temperature exhaust pipe 7, come out from the top of double-deck oil content 3 upper strata again, get into exhaust pipe 4, accomplish the doublestage compression process.
Oil cooling circulation of second, low temperature screw compressor unit 1
Refrigerant liquid from the condenser gets into first gas-liquid separator 9, refrigerant liquid that first gas-liquid separator 9 goes out gets into the oil cooling plate and trades 8, the fluid that goes out from 3 lower floors of double-deck oil content gets into the oil cooling plate through first oil outlet pipe way and trades 8, refrigerant liquid exchanges heat with fluid, refrigerant liquid absorbs the heat, evaporate into gas-liquid mixture and return to first gas-liquid separator 9, wherein, the gas in the first gas-liquid separator 9 gets into the condenser air inlet, the most part of the coolant oil that trades 8 through the oil cooling plate gets into the oil feed mouth of low temperature screw compressor group 1 through low temperature oil feed pipeline 19, accomplish the oil cooling circulation to low temperature screw compressor group 1.
Oil cooling circulation of high-temperature screw compressor unit 6
A small part of the cooling oil exchanged by the oil cooling plate 8 enters an oil supply port of the high-temperature screw compressor unit 6 through a first high-temperature oil supply pipeline 20. The oil liquid from the upper layer of the double-layer oil component 3 enters the oil supply port of the high-temperature screw compressor unit 6 through the second high-temperature oil supply pipeline 21. The cooling oil on the first high-temperature oil supply pipeline 20 and the cooling oil on the second high-temperature oil supply pipeline 21 enter the oil supply port of the high-temperature screw compressor unit 6 together, so that the oil cooling circulation of the high-temperature screw compressor unit 6 is completed.
Air suction overheating control of four-high-temperature screw compressor unit 6
Refrigerant liquid from the first gas-liquid separator 9 enters the liquid accumulator 12 through the first liquid supply pipeline 16, part of the liquid from the liquid accumulator 12 enters the medium-cold plate exchanger 13, after heat exchange is carried out with liquid separated from the second gas-liquid, a small part of the liquid is throttled and decompressed through the thermal expansion valve 25, and then the liquid which is changed into low-temperature and low-pressure gas enters the high-temperature suction pipeline 5.
The refrigerant liquid from the first gas-liquid separator 9 enters the second gas-liquid separator 10 through the second liquid supply pipe 17, the liquid separated from the second gas-liquid enters the middle-cooling plate exchanger 13, exchanges heat with the liquid from the liquid reservoir 12, and the gas discharged enters the high-temperature suction pipe 5.
The separated liquid of the second gas-liquid separator 10 exchanges heat with the liquid from the liquid reservoir 12 to complete the inter-cooling circulation, and the discharged gas enters the high-temperature gas suction pipeline 5 to control the gas suction superheat of the high-temperature screw compressor unit 6.
Air supplement circulation of five-temperature screw compressor unit 1
The refrigerant liquid from the first gas-liquid separator 9 enters the third gas-liquid separator 11 through the third liquid supply line 18, a part of the liquid separated from the third gas-liquid enters the supercooling plate exchanger 14, and a part of the liquid from the accumulator 12 enters the supercooling plate exchanger 14, and both heat exchanges. Wherein, the gas from the second outlet of the supercooling plate exchanger 14 enters the low-temperature gas absorption pipeline 26 to complete the gas compensation circulation of the low-temperature screw compressor unit 1, and the liquid from the first outlet of the supercooling plate exchanger 14 is used as the tail end system for supplying liquid.
And the other part of the liquid separated from the third gas-liquid enters the economizer sub-cooling plate exchanger 15, and most of the liquid coming out of the first outlet of the middle-cooling plate exchanger 13 enters the economizer sub-cooling plate exchanger 15 to exchange heat with the economizer sub-cooling plate exchanger 15. Liquid coming out of a first outlet of the cold plate exchanger 15 of the economizer is used as tail end system liquid supply, a gas-liquid mixture coming out of a second outlet of the cold plate exchanger 15 of the economizer enters the third gas-liquid separator 11, after gas-liquid separation, gas flows out of the third gas-liquid separator 11 and enters an economizer air supplement port of the low-temperature screw compressor unit 1 through the low-temperature air supplement pipeline 27.
Sixthly, hot gas defrosting
When defrosting is carried out, the rest pipelines are closed, medium-pressure gas coming out from the side edge of the upper oil component of the double-layer oil component 3 is condensed by the first defrosting pipeline 28 to defrost the surface of the coil, and defrosting return liquid after heat exchange enters the first gas-liquid separator 9 through the second defrosting pipeline 29. Wherein, the buffer tank 30 is used for buffering the pressure of the defrosting return liquid.
The utility model has the advantages and beneficial effects that:
1. through adopting doublestage compression cycle, compare with low temperature screw compressor unit 1 that the economic ware was added to the unit, refrigeration efficiency is higher than 61% (wherein, the coefficient of performance COP of this embodiment is 1.4, and current coefficient of performance COP is 0.87), and the economize on electricity performance is obvious, and the screw compressor unit is fragile few, the maintenance cycle is long, prolongs the life of compressor greatly.
2. The screw two-stage matching parallel unit adopts a plurality of screw compressors as low-temperature machines and more than one screw compressor as high-temperature machines, and multi-stage energy adjustment ensures that the coefficient of performance (COP) of the quick-freezing system is always highest.
3. All the compression main machines under the same pressure working condition in the double-stage matching parallel unit are standby machines, and even if a certain main machine breaks down, other compressors can still work normally, so that the normal production of owners is ensured.
4. The two-stage matching and matching compression refrigeration system is a special quick-freezing refrigeration unit completely designed for a quick-freezing working condition, aiming at the characteristics of large temperature change and large load change of the quick-freezing working condition, the intermediate temperature of the two-stage matching and matching refrigeration unit is automatically increased according to the terminal load at the initial high warehouse temperature, and the COP value reaches the highest value under the evaporation temperature; after the reservoir temperature is reduced, the intermediate temperature automatically decreases, and the COP value still maintains the maximum value at the new evaporation temperature.
In addition, the high temperature screw rod unit is adopted to the doublestage joining in marriage the unit in the earlier stage, and the mode that low temperature screw rod unit and high temperature screw rod unit mutually supported is adopted in the later stage, realizes cascaded cooling, directly adopts low temperature screw rod unit cooling to compare with current, can realize rapid cooling, and reduce the consumption.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. The utility model provides a screw rod unit doublestage is joined in marriage and is taken compression refrigerating system which characterized in that: including low temperature screw compressor unit, high temperature screw compressor unit, double-deck oil content, first vapour and liquid separator and reservoir, low temperature screw compressor unit is equipped with low temperature exhaust pipe, high temperature screw compressor unit is equipped with high temperature suction line, high temperature exhaust pipe, low temperature exhaust pipe, high temperature suction line and high temperature exhaust pipe respectively with double-deck oil content is connected, double-deck oil content trades through the oil cooling board and constitutes the heat exchange circulation between the first vapour and liquid separator, makes the fluid of double-deck oil content does respectively low temperature screw compressor unit and high temperature screw compressor unit fuel feeding, be equipped with first feed liquid pipeline on the first vapour and liquid separator, first feed liquid pipeline is connected with the reservoir.
2. The screw unit two-stage match compression refrigeration system of claim 1, wherein: the low temperature exhaust pipe and the high temperature pipeline of breathing in respectively with the lower floor of double-deck oil content is connected, high temperature exhaust pipe is connected with double-deck oil content upper strata, the top of double-deck oil content is equipped with exhaust pipe.
3. The screw unit two-stage match compression refrigeration system of claim 1, wherein: the oil cooling plate is connected with a lower layer of the double-layer oil component, a first outlet of the oil cooling plate is connected with a low-temperature oil supply pipeline and a first high-temperature oil supply pipeline respectively, a liquid outlet of the first gas-liquid separator, a second inlet of the oil cooling plate, a second outlet of the oil cooling plate and an air inlet of the first gas-liquid separator are connected in sequence to form a circulation loop, the low-temperature oil supply pipeline is arranged on the low-temperature screw compressor unit, and the first high-temperature oil supply pipeline is arranged on the high-temperature screw compressor unit.
4. The screw unit two-stage match compression refrigeration system of claim 3, wherein: the upper layer of the double-layer oil content is connected with a second high-temperature oil supply pipeline, and the second high-temperature oil supply pipeline is arranged on the high-temperature screw compressor unit and is connected with the first high-temperature oil supply pipeline in parallel.
5. The screw unit two-stage match compression refrigeration system of claim 1, wherein: the heat exchange device is characterized by further comprising a second gas-liquid separator and an intermediate cooling plate exchanger, wherein the second gas-liquid separator is connected with the first gas-liquid separator through a second liquid supply pipeline, the second gas-liquid separator forms heat exchange circulation with the liquid reservoir through the intermediate cooling plate exchanger, a first inlet of the intermediate cooling plate exchanger is connected with a liquid outlet of the liquid reservoir, a first outlet of the intermediate cooling plate exchanger is connected with the high-temperature air suction pipeline, a liquid outlet of the second gas-liquid separator, a second inlet of the intermediate cooling plate exchanger, a second outlet of the intermediate cooling plate exchanger and an air inlet of the second gas-liquid separator are sequentially connected to form a circulation loop, and an air outlet of the second gas-liquid separator is connected with the high-temperature air suction pipeline.
6. The screw unit two-stage match compression refrigeration system of claim 5, wherein: and a stop valve, an electromagnetic valve and a thermostatic expansion valve are sequentially arranged between the first outlet of the middle cooling plate and the high-temperature air suction pipeline.
7. The screw unit two-stage match compression refrigeration system of claim 5, wherein: still include the third vapour and liquid separator and cross the cold plate and trade, the third vapour and liquid separator passes through the third and supplies liquid pipeline to be connected with first vapour and liquid separator, cross the liquid outlet that the first import that the cold plate traded is connected with the reservoir, cross the first export that the cold plate traded and end system connection, cross the second import that the cold plate traded and be connected with the liquid outlet of third vapour and liquid separator, cross the second export that the cold plate traded and be connected with the low temperature suction pipeline, the low temperature pipeline of breathing in is located on the low temperature screw compressor unit.
8. The screw unit two-stage match compression refrigeration system of claim 7, wherein: the cold plate exchanger is characterized by further comprising an economizer passing cold plate exchanger, a first inlet of the economizer passing cold plate exchanger is connected with a first outlet of the middle cold plate exchanger, a first outlet of the economizer passing cold plate exchanger is connected with a terminal system, a second inlet of the economizer passing cold plate exchanger is connected with a liquid outlet of a third gas-liquid separator, a second outlet of the economizer passing cold plate exchanger is connected with a low-temperature gas supplementing pipeline through the third gas-liquid separator, and the low-temperature gas supplementing pipeline is arranged on the low-temperature screw compressor unit.
9. The screw unit two-stage match compression refrigeration system of claim 1, wherein: still include the defrosting system, the defrosting system includes first defrosting pipeline and second defrosting pipeline, the one end of first defrosting pipeline is connected with the lower floor of double-deck oil content, the other end of first defrosting pipeline is connected with condensing coil's one end, the one end of second defrosting pipeline is connected with condensing coil's the other end, the other end of second defrosting pipeline is connected with first gas-liquid separator's inlet.
10. The screw unit two-stage match compression refrigeration system of claim 9, wherein: a buffer tank is arranged on the second defrosting pipeline.
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| CN202122734099.6U CN216132128U (en) | 2021-11-09 | 2021-11-09 | Two-stage matched compression refrigeration system of screw unit |
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| CN202122734099.6U CN216132128U (en) | 2021-11-09 | 2021-11-09 | Two-stage matched compression refrigeration system of screw unit |
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