CN108266915A - It is a kind of to use single working medium CO2Make the cascade refrigeration system of refrigerant - Google Patents
It is a kind of to use single working medium CO2Make the cascade refrigeration system of refrigerant Download PDFInfo
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- CN108266915A CN108266915A CN201810178025.9A CN201810178025A CN108266915A CN 108266915 A CN108266915 A CN 108266915A CN 201810178025 A CN201810178025 A CN 201810178025A CN 108266915 A CN108266915 A CN 108266915A
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- condenser
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 42
- 238000005057 refrigeration Methods 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 76
- 238000001035 drying Methods 0.000 claims abstract description 26
- 238000001914 filtration Methods 0.000 claims abstract description 25
- 239000006200 vaporizer Substances 0.000 claims abstract description 12
- 238000009833 condensation Methods 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 description 12
- 230000008020 evaporation Effects 0.000 description 10
- 235000013305 food Nutrition 0.000 description 5
- 238000000926 separation method Methods 0.000 description 3
- 230000019771 cognition Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 235000019609 freshness Nutrition 0.000 description 1
- 235000012055 fruits and vegetables Nutrition 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/04—Details of condensers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
Single working medium CO is used the invention discloses a kind of2Make the cascade refrigeration system of refrigerant.Including high temperature compressor, cryogenic compressor, medium temperature evaporator, cryogenic vaporizer, condenser/evaporator, underground pipe condenser, medium temperature gas-liquid separator, low temperature gas-liquid separator, liquid storage device, oil eliminator, expansion valve, solenoid valve, flow control valve, device for drying and filtering, check valve, pressure transmitter, temperature sensor is connected with each other by pipeline, flow control valve is provided between the underground pipe condenser and medium temperature solenoid valve, pressure transmitter and expansion valve are disposed between the medium temperature evaporator and gas-liquid separator, pressure transmitter and check valve are provided between the condenser/evaporator and medium temperature gas-liquid separator, solenoid valve is provided between the liquid storage device and cryogenic compressor suction line, pressure transmitter and expansion valve, check valve is provided between the low temperature gas-liquid separator and cryogenic compressor.The present invention uses single natural refrigerant CO2As the refrigerant of cascade refrigeration system, influence of the discharge refrigerant to environment is reduced.
Description
Technical field
The present invention relates to environmental-protection refrigeration technical fields, especially relate to a kind of single working medium CO of use2Make refrigerant
Cascade refrigeration system.
Background technology
With the continuous expansion of the fast development of China's economy, people's living standards continue to improve and food processing industry
Greatly, requirement of the market to the quality of food, freshness, nutrition, flavor etc. is higher and higher.Freezer is ensured in food quality
Mostly important function building object due to a large amount of fruits and vegetables yield in China and demand, results in market for freezer demand
It is growing.Different types of perishable food is stored due to needing, it is therefore desirable to which the library of different temperatures is come in commercial freezers
Meet actual demand.
Refrigerating plant is most important equipment during freezer is built, but nowadays international community faces the environment dirt that refrigerant is brought
The problem of dye and refrigerating plant high energy consumption etc., becomes refrigeration row using environment friendly refrigerating fluid and reduction refrigeration system energy consumption
The main trend of industry development.
The refrigerant used in the existing currently on the market and refrigerating plant of freezer newly built is mostly freon, in order to
Leakage of refrigerant is avoided to pollute the environment, natural refrigerant becomes one of most important selection in refrigerant replacement.CO2 because
Its GWP is 1, ODP 0, and good hot physical property becomes the emphasis of people's concern and research again.But due to the stagnation temperature of CO2
Relatively low (31.1 DEG C) are spent, in the case where warming band climatic environment, CO2 systems mosts are trans critical cycle, and its critical pressure is high
(7.38MPa) causes the operating pressure height of system, restriction loss big, and coefficient of performance is limited less than conventional fluorine system system
The popularization of CO2 refrigeration systems.
Therefore, CO is improved2The performance of refrigeration system, becomes CO2The important directions of system research.
Invention content
The invention mainly solves the technical problem of providing a kind of CO2/CO2Cascade refrigeration system is fluctuated using subsurface temperature
It is small and throughout the year be less than CO2The characteristics of critical-temperature, makes CO using underground pipe condenser2High-temperature level system can realize subcritical follow
Ring, so as to make entire CO2System realizes subcritical cycle, improves CO2System effectiveness.
The technical solution adopted to achieve the purpose of the present invention is：
It is a kind of to use single working medium CO2Make the cascade refrigeration system of refrigerant, the cascade refrigeration system is by high-temperature level
What device and low temperature stage arrangement were coupled to form by condenser/evaporator；
High temperature stage arrangement includes high temperature compressor, oil eliminator, underground pipe condenser, device for drying and filtering one, medium temperature evaporation
Device and medium temperature gas-liquid separator, the outlet of high temperature compressor by pipeline successively with oil eliminator, underground pipe condenser, dried
Filter one connects, and device for drying and filtering one connects two branches, is connected all the way by setting solenoid valve one with the pipeline of expansion valve one
Medium temperature evaporator, medium temperature evaporator is by setting the pipeline of pressure transmitter one, expansion valve two to connect medium temperature gas-liquid separator；Separately
The pipeline connection condenser/evaporator of configured flow control valve one, solenoid valve two, expansion valve three, temperature sensor one all the way, it is cold
Solidifying evaporator is by setting pressure transmitter two to connect medium temperature gas-liquid separator with the pipeline of check valve one；Medium temperature gas-liquid separator
Connect the air entry of high temperature compressor；
Low temperature stage arrangement includes cryogenic compressor, liquid storage device, device for drying and filtering two and gas-liquid separator；Cryogenic compressor
Outlet is connect by pipeline with oil eliminator, temperature sensor two and condenser/evaporator successively, and condenser/evaporator is by setting electricity
Magnet valve three pipeline connection liquid storage device, condenser/evaporator by the way that solenoid valve nine and the pipeline of check valve three is set to connect liquid storage device,
Liquid storage device is by setting the pipeline of solenoid valve four to connect device for drying and filtering two and solenoid valve 11 respectively, and solenoid valve 11 is by setting
The pipeline connection underground pipe condenser of solenoid valve ten and device for drying and filtering one are put, device for drying and filtering two is by setting five He of solenoid valve
The pipeline connection cryogenic vaporizer of expansion valve four, cryogenic vaporizer is by setting the pipeline of pressure transmitter three to connect electromagnetism respectively
Valve six and solenoid valve 12, solenoid valve six are sequentially connected gas-liquid separator and check valve two by pipeline, and solenoid valve 12 passes through
The pipeline of setting solenoid valve 13 connects medium temperature gas-liquid separator and expansion valve two respectively；Check valve two connects low temperature by pipeline
The entrance of compressor, liquid storage device steam (vapor) outlet connect solenoid valve seven and solenoid valve eight by pipeline respectively, and solenoid valve seven is by setting
The entrance that pressure transmitter four connects cryogenic compressor with the pipeline of expansion valve five is put, solenoid valve eight connects condenser/evaporator respectively
With temperature sensor two.
High temperature compressor and low-temperature level compressor are the screw compressor, rotor compressor, screw compression of fixed frequency or frequency conversion
Any one of machine, piston compressor.
The expansion valve is any one of electric expansion valve, heating power expansion valve, capillary or orifice throttle.
The condenser/evaporator is plate heat exchanger or double pipe heat exchanger.
The underground pipe condenser is connected with each other vertically for several double U ground heat exchangers or U-shaped double pipe heat exchanger
It is embedded to underground.
The high and low temperature grade refrigeration system of this system uses natural refrigerant CO2As refrigerant.There are two types of recycle for this system
Pattern：
Pattern one, two evaporators are opened simultaneously, provide different evaporating temperatures.In such a mode, high-temperature level CO2System
Cryogen is dried after being condensed in double-U-shaped underground pipe condenser through device for drying and filtering, is then divided into two-way, all the way expanded valve throttling
Enter medium temperature evaporator evaporation endothermic afterwards, entering condenser/evaporator after the expanded valve throttling of another way exchanges heat, and subsequent two-way converges
Gas-liquid separation is carried out into medium temperature gas-liquid separator, suction line of the steam isolated through compressor enters high temperature compressor,
The gas of low-temp low-pressure is condensed into high temperature height after compressor is compressed into the gas of high temperature and pressure into double-U-shaped underground pipe condenser
The liquid of pressure, so completes high-temperature level refrigeration cycle.The CO of low-temperature level2Refrigerant is condensed into high temperature and pressure in condenser/evaporator
Liquid after enter liquid storage device, subsequent liquid refrigerant dries through device for drying and filtering, enters cryogenic vaporizer after expansion valve throttling
Evaporation endothermic, the gas-liquid mixed refrigerant of the low-temp low-pressure come out from evaporator are separated after gas-liquid separator separates
Gas is mixed into cryogenic compressor with the liquid storage device steam by pressure-regulating valve decompression, and the steam of low-temp low-pressure is through compressor
Enter the liquid that condenser/evaporator is condensed into high temperature and pressure after being compressed into the steam of high temperature and pressure, so move in circles, complete low
Temperature cycle.
Pattern two, two evaporators are opened simultaneously, provide identical evaporating temperature.In such a mode, it is cold through underground pipe
The refrigerant liquid cognition of condenser condensation is divided into two-way, is divided into two-way after device for drying and filtering is dried into high-temperature systems all the way,
Evaporator evaporation sucking in entering after expanded valve throttling all the way enters condenser/evaporator after expanded valve throttling all the way and absorbs heat
Amount；Another way accesses low-temperature level by the liquid refrigerant that underground pipe condenser comes out by bypass branch, is done through device for drying and filtering
It is dry, enter cryogenic vaporizer evaporation endothermic after expansion valve throttling, the gas-liquid mixed refrigerant come out from evaporator is through bypass branch
Enter medium temperature gas-liquid separator after being mixed with the refrigerant from condenser/evaporator and medium temperature evaporator, the refrigerant isolated steams
Gas enters high temperature compressor compression through high temperature compressor air intake duct, and the refrigerant gas of the high temperature and pressure come out from compressor enters
Underground pipe condenser is condensed into liquid, completes refrigeration cycle.Gas in cycle in liquid storage device is using free convection through bypass pipe
Road, which enters after condenser/evaporator is condensed into liquid, to be returned to using the bypass line for having height potential difference in liquid storage device.
Compared with prior art, the invention has the advantages and positive effects that：
(1) using CO2As system refrigerant.Due to CO2GWP for 1, ODP 0, be environmentally friendly refrigerant and tool
There is excellent hot physical property, compared to conventional refrigeration system, direct carbon emission is essentially 0.
(2) CO is utilized2System running pressure is high and subsurface temperature fluctuation is small and is less than CO throughout the year2Critical-temperature (31.1
DEG C) the characteristics of, CO is made using underground pipe condenser2High-temperature level system can realize subcritical cycle, compared to CO2Trans-critical cycle follows
Ring, CO2System effectiveness has larger promotion, improves entire CO2The efficiency of cascade system.
(3) double-U-shaped underground pipe has been selected, condensing heat-exchange area has been increased, reduces buried depth, reduce cost.
(4) can realize that single refrigeration system provides the reserve temperature in high and low temperature library for two freezers, reduce engineering into
This, at the same also may be implemented in certain based food amount of storage it is big when, Freezing room is changed into high temperature library, meets actual demand.
Description of the drawings
Fig. 1 show cascade refrigeration system schematic diagram of the present invention.
In figure：1. high temperature compressor；2. oil eliminator；3. double-U-shaped underground pipe condenser；4. device for drying and filtering one；5. stream
Adjustable valve；6. solenoid valve one；7. expansion valve one；8. medium temperature evaporator；9. pressure transmitter one；10. expansion valve two；11. electricity
Magnet valve two；12. expansion valve three；13. temperature sensor one；14. condenser/evaporator；15. pressure transmitter two；16. check valve one；
17. medium temperature gas-liquid separator；18. cryogenic compressor；19. oil eliminator；20. temperature sensor two；21. solenoid valve three；22. storage
Liquid device；23. solenoid valve four；24. device for drying and filtering two；25. solenoid valve five；26. expansion valve four；27. cryogenic vaporizer；28. pressure
Power transmitter three；29. solenoid valve six；30. low temperature gas-liquid separator；31. check valve two；32. solenoid valve seven；33. pressure inverting
Device four；34. expansion valve five；35. solenoid valve eight；36. solenoid valve nine；37. check valve three；38. solenoid valve ten；39. solenoid valve ten
One；40. solenoid valve 12；41. solenoid valve 13.
Specific embodiment
The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
Fig. 1 show a kind of single working medium CO of use of the present invention2Make the cascade refrigeration system of refrigerant.The present invention is by height
It is warm compressor 1, oil eliminator 2, double-U-shaped underground pipe condenser 3, device for drying and filtering 1, flow control valve 5, solenoid valve 1, swollen
Swollen valve 1, medium temperature evaporator 8, pressure transmitter 1, expansion valve 2 10, solenoid valve 2 11, expansion valve 3 12, temperature sensor
One 13, condenser/evaporator 14, pressure transmitter 2 15, check valve 1, medium temperature gas-liquid separator 17, cryogenic compressor 18, oil
Separator 19, temperature sensor 2 20, solenoid valve 3 21, liquid storage device 22, solenoid valve 4 23, device for drying and filtering 2 24, solenoid valve
5 25, expansion valve 4 26, cryogenic vaporizer 27, pressure transmitter 3 28, solenoid valve 6 29, low temperature gas-liquid separator 30, unidirectional
Valve 2 31, solenoid valve 7 32, pressure transmitter 4 33, expansion valve 5 34, solenoid valve 8 35, solenoid valve 9 36, check valve 3 37,
Solenoid valve 10, solenoid valve 11, solenoid valve 12, solenoid valve 13 form.
The operation principle of the present embodiment is：
Pattern one：In such a mode, by PLC control close solenoid valve 8 35, solenoid valve 9 36, solenoid valve 10,
Solenoid valve 11, solenoid valve 12, solenoid valve 13, opens solenoid valve 1, solenoid valve 2 11, solenoid valve 3 21, electricity
Magnet valve 4 23, solenoid valve 5 25, solenoid valve 6 29, solenoid valve 7 32 complete circulate operation.High-temperature level CO2Refrigerant is double-U-shaped
It is dried after being condensed in underground pipe condenser 3 through device for drying and filtering 4, is then divided into two-way, expanded valve 1 enters after throttling all the way
8 evaporation endothermic of medium temperature evaporator, the expanded valve 2 12 of another way exchange heat after throttling into condenser/evaporator 14, and subsequent two-way converges
Gas-liquid separation is carried out into medium temperature gas-liquid separator 17, suction line of the steam isolated through high temperature compressor 1 enters high temperature
Compressor 1, the gas of low-temp low-pressure enter double-U-shaped buried pipework condensation after high temperature compressor 1 is compressed into the gas of high temperature and pressure
Device 3 is condensed into the liquid of high temperature and pressure, so completes high-temperature level refrigeration cycle.The CO of low-temperature level2Refrigerant is in condenser/evaporator
Enter liquid storage device 22 after the liquid of high temperature and pressure is condensed into 14, subsequent liquid refrigerant is dried through device for drying and filtering 2 24, swollen
Swollen valve 4 26 enters 27 evaporation endothermic of cryogenic vaporizer after throttling, the gas-liquid mixed of the low-temp low-pressure come out from cryogenic vaporizer 27
After the separation of gas-liquid separator 30, the gas separated mixes refrigerant with 22 steam of liquid storage device being depressured by expansion valve 5 34
It closes and enters cryogenic compressor 18, the steam of low-temp low-pressure enters condensation after cryogenic compressor 18 is compressed into the steam of high temperature and pressure
Evaporator 14 is condensed into the liquid of high temperature and pressure, so moves in circles, and completes low-temperature circulating.
Pattern two：In such a mode, it is equally also required to PLC to control the opening and closing of solenoid valve, closes solenoid valve three
21st, solenoid valve 4 23, solenoid valve 6 29, solenoid valve 7 32, opens solenoid valve 10, solenoid valve 11, solenoid valve 5 25, electricity
Magnet valve 12, solenoid valve 13, solenoid valve 1, solenoid valve 2 11, solenoid valve 8 35, solenoid valve 9 36 complete cycle behaviour
Make.Refrigerant liquid cognition by the condensation of double-U-shaped underground pipe condenser 3 is divided into two-way, all the way into high-temperature systems through dried
Filter 1 is divided into two-way after drying, and enters 8 evaporation endothermic of medium temperature evaporator after expanded valve 1 throttles all the way, all the way through swollen
Swollen valve 3 12 enters condenser/evaporator 14 after throttling and absorbs heat；The liquid system that another way is come out by double-U-shaped underground pipe condenser 3
Cryogen accesses low-temperature level by bypass branch, is dried through device for drying and filtering 2 24, and expansion valve 4 26 enters low-temperature evaporation after throttling
27 evaporation endothermic of device, from the gas-liquid mixed refrigerant that cryogenic vaporizer 27 comes out through bypass branch with from condenser/evaporator 14 and
Enter medium temperature gas-liquid separator 17 after the refrigerant mixing of medium temperature evaporator 8, the refrigerant vapour isolated is through high temperature compressor 1
Air intake duct enters high temperature compressor 1 and compresses, and the refrigerant gas of the high temperature and pressure come out from high temperature compressor 1 enters double-U-shapedly
Pipe laying condenser 3 is condensed into liquid, completes refrigeration cycle.Gas in cycle in liquid storage device 22 is using free convection through bypass pipe
Road, which enters after condenser/evaporator 14 is condensed into liquid, to be returned to using the bypass line for having height potential difference in liquid storage device 22.
The temperature sensor 1 be in order to which the value with temperature sensor 2 20 in being controlled in system is compared, with
Adjust the aperture of flow control valve 5.
The pressure transmitter 1 is in order to which the value with pressure transmitter 2 15 in being controlled in system compares, to control
The aperture of expansion valve 2 10 processed.
The check valve 1 is gas-liquid mixed system after the expanded valve throttling of steam that medium temperature evaporator comes out in order to prevent
The pressure of cryogen be higher than from condenser/evaporator come out steam, caused by backflow phenomenon.
The pressure transmitter 4 33 is in order to which the value with pressure transmitter 3 28 in being controlled in system compares, to control
The aperture of expansion valve 5 34 processed.
The check valve 2 31 is pressure of the refrigerant vapour after expansion valve throttles come out in order to prevent from liquid storage device
Power is higher than from backflow phenomenon caused by the steam pressure that gas-liquid separator comes out.
The check valve 3 37 is that the steam in order to prevent in expansion drum enters condenser/evaporator through this bypass line, is caused
Normal circulation short circuit.
The foregoing is merely the embodiment of the present invention, are not intended to limit the scope of the invention, every to utilize this hair
The equivalent structure or equivalent flow shift that bright specification and accompanying drawing content are made directly or indirectly is used in other relevant skills
Art field is similarly included in the scope of patent protection of the present invention.
Claims (5)
1. a kind of use single working medium CO2Make the cascade refrigeration system of refrigerant, it is characterized in that, the cascade refrigeration system be by
What high temperature stage arrangement and low temperature stage arrangement were coupled to form by condenser/evaporator；
High temperature stage arrangement include high temperature compressor, oil eliminator, underground pipe condenser, device for drying and filtering one, medium temperature evaporator and
Medium temperature gas-liquid separator, the outlet of high temperature compressor by pipeline successively with oil eliminator, underground pipe condenser, device for drying and filtering
One connection, device for drying and filtering one connect two branches, connect medium temperature with the pipeline of expansion valve one by setting solenoid valve one all the way
Evaporator, medium temperature evaporator is by setting the pipeline of pressure transmitter one, expansion valve two to connect medium temperature gas-liquid separator；Another way
Configured flow control valve one, solenoid valve two, expansion valve three, temperature sensor one pipeline connection condenser/evaporator, condensation steam
Device is sent out by the way that pressure transmitter two is set to connect medium temperature gas-liquid separator with the pipeline of check valve one；Medium temperature gas-liquid separator connects
The air entry of high temperature compressor；
Low temperature stage arrangement includes cryogenic compressor, liquid storage device, device for drying and filtering two and gas-liquid separator；The outlet of cryogenic compressor
It is connect successively with oil eliminator, temperature sensor two and condenser/evaporator by pipeline, condenser/evaporator is by setting solenoid valve
Three pipeline connection liquid storage device, condenser/evaporator is by setting solenoid valve nine to connect liquid storage device, liquid storage with the pipeline of check valve three
Device is by setting the pipeline of solenoid valve four to connect device for drying and filtering two and solenoid valve 11 respectively, and solenoid valve 11 is by setting electricity
The pipeline connection underground pipe condenser and device for drying and filtering one of magnet valve ten, device for drying and filtering two is by setting solenoid valve five and expansion
The pipeline connection cryogenic vaporizer of valve four, cryogenic vaporizer is by setting the pipeline of pressure transmitter three to connect solenoid valve six respectively
With solenoid valve 12, solenoid valve six is sequentially connected gas-liquid separator and check valve two by pipeline, and solenoid valve 12 passes through setting
The pipeline of solenoid valve 13 connects medium temperature gas-liquid separator and expansion valve two respectively；Check valve two connects low temperature compression by pipeline
The entrance of machine, liquid storage device steam (vapor) outlet connect solenoid valve seven and solenoid valve eight by pipeline respectively, and solenoid valve seven is pressed by setting
Power transmitter four connects the entrance of cryogenic compressor with the pipeline of expansion valve five, and solenoid valve eight connects condenser/evaporator and temperature respectively
Spend sensor two.
2. a kind of single working medium CO of use according to claim 12Make the cascade refrigeration system of refrigerant, which is characterized in that
High temperature compressor and low-temperature level compressor are the screw compressor for determining frequency or frequency conversion, rotor compressor, helical-lobe compressor, piston pressure
Any one of contracting machine.
3. a kind of single working medium CO of use according to claim 12Make the cascade refrigeration system of refrigerant, which is characterized in that
The expansion valve is any one of electric expansion valve, heating power expansion valve, capillary or orifice throttle.
4. a kind of single working medium CO of use according to claim 12Make the cascade refrigeration system of refrigerant, which is characterized in that
The condenser/evaporator is plate heat exchanger or double pipe heat exchanger.
5. a kind of single working medium CO of use according to claim 12Make the cascade refrigeration system of refrigerant, which is characterized in that
The underground pipe condenser is connected with each other vertical embedment underground for several double U ground heat exchangers or U-shaped double pipe heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810178025.9A CN108266915A (en) | 2018-03-05 | 2018-03-05 | It is a kind of to use single working medium CO2Make the cascade refrigeration system of refrigerant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810178025.9A CN108266915A (en) | 2018-03-05 | 2018-03-05 | It is a kind of to use single working medium CO2Make the cascade refrigeration system of refrigerant |
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| Publication Number | Publication Date |
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| CN108266915A true CN108266915A (en) | 2018-07-10 |
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| CN201810178025.9A Pending CN108266915A (en) | 2018-03-05 | 2018-03-05 | It is a kind of to use single working medium CO2Make the cascade refrigeration system of refrigerant |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111197872A (en) * | 2018-11-16 | 2020-05-26 | 株式会社前川制作所 | Refrigerating device |
| CN111520927A (en) * | 2020-06-08 | 2020-08-11 | 青岛科润工业设备有限公司 | Overlapping refrigerating system and overlapping refrigerating system |
| CN113819671A (en) * | 2021-10-21 | 2021-12-21 | 湖南大学 | Carbon dioxide-based power generation and refrigeration combined system |
| CN114087801A (en) * | 2021-12-01 | 2022-02-25 | 苏州奥德高端装备股份有限公司 | Self-overlapping low-temperature oil cooling unit |
| CN114608212A (en) * | 2022-02-25 | 2022-06-10 | 南通亚泰工程技术有限公司 | Cascade refrigerating plant |
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| EP2708833A1 (en) * | 2012-09-14 | 2014-03-19 | Hitachi Appliances, Inc. | Cascade refrigerating system |
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| CN113819671B (en) * | 2021-10-21 | 2022-12-27 | 湖南大学 | Power generation and refrigeration combined system based on carbon dioxide |
| CN114087801A (en) * | 2021-12-01 | 2022-02-25 | 苏州奥德高端装备股份有限公司 | Self-overlapping low-temperature oil cooling unit |
| CN114608212A (en) * | 2022-02-25 | 2022-06-10 | 南通亚泰工程技术有限公司 | Cascade refrigerating plant |
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