CN102506512A - Refrigerating system with ejector and refrigerating method thereof - Google Patents
Refrigerating system with ejector and refrigerating method thereof Download PDFInfo
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- CN102506512A CN102506512A CN201110349295XA CN201110349295A CN102506512A CN 102506512 A CN102506512 A CN 102506512A CN 201110349295X A CN201110349295X A CN 201110349295XA CN 201110349295 A CN201110349295 A CN 201110349295A CN 102506512 A CN102506512 A CN 102506512A
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Abstract
The invention discloses a refrigerating system with an ejector. The main trend of ejectors is that: a working medium becomes a gaseous working medium through an expansion valve, and the gaseous working medium from an evaporator enters the ejector for pressure expanding through injection, so that the pressure of the working medium is improved; and the working medium is compressed in a compressor and enters a condenser to finish a refrigerating cycle. However, according to the invention, a liquid working medium passing through the expansion valve is continuously throttled through another expansion valve to have a low-temperature low-pressure state, is evaporated in the evaporator, becomes a gaseous working medium through heat absorption to be ejected into the ejector, is pressurized in the ejector and enters the condenser to finish a refrigerating cycle. Therefore, the pressure of the working medium in the compressor is improved, a pressure ratio of the compressor is reduced, and the power consumption of the compressor is reduced, so that the efficiency of the refrigerating system is improved.
Description
Technical field
The present invention relates to a kind of vapor compression refrigeration system, specifically is a kind of vapor compression refrigeration system that comprises an injector.The invention still further relates to the refrigerating method that adopts this refrigeration system.
Background technology
Existing refrigeration system mostly is made up of four big parts: compressor, condenser, expansion valve, evaporimeter; Gaseous refrigerant gets into the liquid that condenser condenses becomes high pressure-temperature after compressor compresses, after the expansion valve throttling expansion, become the two-phase fluid of low-temp low-pressure then, gets into evaporator evaporation again; Get into compressor again after the heat gasification of the outer side liquid of absorption evaporimeter; Thereby accomplish a circulation, in the cyclic process of cold-producing medium, cold-producing medium is a constant-enthalpy process from the process that the throttling through expansion valve of the liquid condition of condensator outlet becomes two-phase fluid; The part useful work has been fallen by restriction loss, thereby has influenced the raising of refrigeration unit efficient.It is increasing that Along with people's growth in the living standard, the electricity consumption in fields such as refrigeration air-conditioner account for the big ratio of energy resource consumption, and along with the anxiety day by day of energy situation, the efficient that improves refrigeration system is the task of top priority.Utilizing injector to replace restricting element that the restriction loss of refrigeration system is reclaimed is the effective way that improves refrigeration system efficient.
Literature search through to prior art is found, Chinese patent document number: CN1460823A, and denomination of invention is the application for a patent for invention of " injector "; It is a kind of injector that is used for the refrigeration system of jet refrigeration circulation; This invention is basic identical with the emitter construction of the steam jet refrigerating system that conventional heat drives, and is made up of superonic flow nozzzle, ejection cavity, mixing chamber and diffuser casing, and nozzle afterwards expands the shape nozzle for contracting earlier; Mixing chamber is that homalographic is cylindrical, and diffuser casing is a truncated cone-shaped.Similarly the patent of ejector applications in refrigeration system had a lot; The main effect of injector is the effect that substitutes expansion valve wholly or in part, reduces restriction loss, thereby improves the efficient of refrigeration system; But because injector import main flow fluid is a liquid refrigerant; The metastable state flow phenomenon can occur in the expansion process in nozzle, reduce the efficient of nozzle, and cold-producing medium mixes in injector with the diffusion process in easy generation shock wave; Reduced ejector efficiency, do not had good method now and solve this problem.And along with the variation of outer work condition, the performance of injector also can be affected, thereby influences the stable of refrigeration system, cause very big trouble can for the control of refrigerant system capacity.
Summary of the invention
The present invention is directed to the above-mentioned deficiency that prior art exists; Designed a kind of refrigeration system with injector, the main flow of injector is through becoming the working medium of gaseous state behind the expansion valve, and the gaseous working medium that from evaporimeter, comes out through injection gets in the injector and carries out diffusion; Improve the pressure of working medium; Get into compressor then and compress, get into condenser then, accomplish kind of refrigeration cycle.Then continue throttling through an expansion valve again through the liquid refrigerant behind the expansion valve; Becoming low-temp low-pressure state entering evaporimeter evaporates; Heat absorption is got into injector by injection after becoming gaseous state then, in injector, gets into compressor behind the raising pressure then, accomplishes kind of refrigeration cycle.This has the refrigeration system using gases injection gas of injector; Both avoid two phase flow can produce the factor that shock wave etc. lowers efficiency, also increased the pressure of compressor inlet working medium simultaneously, reduced the pressure ratio of compressor; Reduce consumption of compressor, thereby improved the efficient of refrigeration system.Owing to always have liquid refrigerant through evaporator refrigerating capacity to be provided, when causing injector performance to change owing to the outer work condition variation, system also can provide fixing refrigerating capacity, so just can effectively control the refrigerating capacity of refrigeration system.
The present invention realizes through following technical scheme, the present invention includes: compressor, condenser, expansion valve, evaporimeter, injector, Intermediate Heat Exchanger, gas-liquid separator.Wherein, The outlet of compressor links to each other with the inlet of condenser, and the outlet of condenser is connected to the inlet of first expansion valve, and the outlet of first expansion valve is connected with the inlet of gas-liquid separator; The gas vent of gas-liquid separator is connected with the main flow import of injector; The liquid outlet of gas-liquid separator is connected with the inlet of second expansion valve, and the outlet of second expansion valve is connected with the inlet of evaporimeter, and the outlet of evaporimeter is connected with injector gas injection inlet; The outlet of injector is connected to the inlet of compressor, forms complete circulation.Further, the present invention also can comprise Intermediate Heat Exchanger, and said Intermediate Heat Exchanger comprises first side and second side of mutual heat-shift; The outlet of condenser is connected with the inlet of Intermediate Heat Exchanger first side, and the outlet of Intermediate Heat Exchanger first side links to each other with the inlet of first expansion valve; The outlet of injector links to each other with the inlet of Intermediate Heat Exchanger second side, and the outlet of Intermediate Heat Exchanger second side is connected with the inlet of compressor.In an embodiment of the invention, also can omit Intermediate Heat Exchanger, the outlet of condenser is connected to the inlet of first expansion valve, and the outlet of injector is connected to the inlet of compressor.
Working medium is compressed in compressor in the back entering condenser and is carried out condensation, gets into the working medium of coming out with injector in the Intermediate Heat Exchanger after the liquefy and carries out heat exchange, becomes cold liquid; Carry out throttling through expansion valve then; Become gas-liquid mixture and get in the gas-liquid separator, wherein gaseous working medium gets into the main flow that injector becomes injector, and the gaseous working medium that injection comes out from evaporimeter gets into injector; In injector, improve pressure then; Continue to get into the working medium of coming out with condenser in the Intermediate Heat Exchanger again and carry out heat exchange, working medium further improves temperature and pressure, gets into compressor then and accomplishes circulation; Liquid refrigerant then continues throttling through an expansion valve again, becomes the low-temp low-pressure state and gets into heat exchange in the evaporimeter, and refrigerating capacity is provided, and the working medium heat absorption is got in the injector by injection after becoming gaseous state, accomplishes circulation with the gaseous working medium of injector main flow then.
This refrigeration system can be used for various cold-producing mediums commonly used, like R134a, R404A, R22 and carbon dioxide etc., is used for improving the efficient of kind of refrigeration cycle.
The present invention's advantage compared with prior art comprises:
1) form of the gas injection gas of injector employing; The ejector efficiency decline that the shock wave of having avoided can occurring in the two-phase flow injector and the metastable state of working medium cause; Can guarantee the operation that injector is stable, also improve the pressure of compressor inlet working medium simultaneously, reduce the pressure ratio of compressor; Reduce consumption of compressor, thereby improve the efficient of refrigeration system.
2) owing to there is fixing fluid to flow through evaporimeter, when the performance of outer work condition variable effect injector, guarantee that refrigeration system has fixing refrigerating capacity, made things convenient for the control of injector refrigerant system capacity, reduced the influence of external environment to refrigeration system.
Below will combine accompanying drawing that the technique effect of design of the present invention, concrete structure and generation is described further, to understand the object of the invention, characteristic and effect fully.
Description of drawings
Fig. 1 is the sketch map of the injector circulation of the embodiment of the invention 1.
Fig. 2 is the injector enlarged diagram of injector circulation.
Fig. 3 is that the P-h of pressure and enthalpy schemes in the injector circulation of Fig. 1.
Fig. 4 is the sketch map of the injector circulation of the embodiment of the invention 2.
The specific embodiment
Embodiment 1:
As shown in Figure 1, the refrigeration system with injector of present embodiment, it is by compressor 10, condenser 20, and Intermediate Heat Exchanger 30, expansion valve 40, gas-liquid separator 50, injector 60, expansion valve 70 and evaporimeter 80 are formed.Annexation between each parts: the outlet of compressor 10 links to each other with the inlet of condenser 20; The outlet of condenser 20 is connected with the inlet of Intermediate Heat Exchanger 30 first sides then; Then the outlet of Intermediate Heat Exchanger 30 first sides links to each other with the inlet of expansion valve 40, and the outlet of expansion valve 40 is connected with the inlet of gas-liquid separator 50 then, and the gas vent of gas-liquid separator 50 is connected with injector 60 main flow imports then; And the liquid outlet of gas-liquid separator 50 is connected with the inlet of expansion valve 70; Then the outlet of expansion valve 70 is connected with the inlet of evaporimeter 80, and the outlet of evaporimeter 80 is connected with injector 60 gas injections inlet then, and the outlet of injector 60 links to each other with the inlet of Intermediate Heat Exchanger 30 second sides then; The outlet of last Intermediate Heat Exchanger 30 is connected with the inlet of compressor 10, forms complete circulation.
Working medium becomes the gaseous state of HTHP after overcompression in compressor 10; Get into then and carry out condensation in the condenser 20; Then working medium get in the Intermediate Heat Exchanger 30 with injector 60 in the working medium of coming out carry out heat exchange, become supercooled state, pass through the throttling action of expansion valve 40 then; Becoming gas-liquid two-phase flows in the gas-liquid separator 50; Working medium was divided into two-way and circulated respectively this moment, the working medium of gaseous state directly in the entering injector 60 wherein, the gaseous working medium that from evaporimeter 80, comes out as injector main flow injection; And liquid working medium can be carried out throttling through an expansion valve 70 more once more, gets into then and evaporates in the evaporimeter 80, for the external world provides refrigerating capacity; Working medium becomes gaseous state by in the injection entering injector 60 then, mixes with the gaseous working medium that comes out in the gas-liquid separator 50, passes through the diffusion of injector 60 then; The boost in pressure of working medium; Get in the Intermediate Heat Exchanger 30 with condenser 20 in the working medium of coming out carry out heat exchange, become superheat state, get back to then in the compressor 10 and accomplished circulation.
As shown in Figure 2, injector 60 comprises a nozzle 61, induction chamber 62, mixing chamber 63, a diffuser 64.Annexation between injector 60 parts: the gas vent of gas-liquid separator 50 is connected with nozzle 61; Evaporimeter 80 links to each other with induction chamber 62 simultaneously; Nozzle 61 links to each other with mixing chamber 63 with induction chamber 62 then; Mixing chamber 63 is connected with diffuser 64 then, and last diffuser 64 links to each other with Intermediate Heat Exchanger 30.Nozzle 61 changes the pressure energy of high-pressure working medium into the speed energy, and by this way, promptly 61 pairs of working medium of nozzle have been carried out the constant entropy step-down and made its expansion.In induction chamber 62, the gaseous working medium that the high speed working medium stream of discharging from nozzle 61 will evaporate evaporimeter 80 extracts into induction chamber 62, and mixes with the working medium of gaseous state.Working medium is mixed in mixing chamber 63 fully; In diffuser 64; Further mixed from the working medium of nozzle 61 discharges and the working medium that from evaporimeter 80, extracts; Dynamic pressure with working medium simultaneously converts corresponding static pressure into, and by this way, the speed energy of working medium changes pressure energy into and increased the pressure of working medium.
In the present embodiment, the speed of nozzle 61 working medium that is used for nozzle 61 is discharged is increased to the level that is equal to or greater than velocity of sound.
That shown in Figure 3 is the P-h figure of Fig. 1 cyclic process; As shown in the figure; What Pn represented is the process that power pressure changes in the nozzle 61; What Pe represented is the process that working medium changes through expansion valve 70 and evaporimeter 80 pressure, and what Δ P represented is this system compares compressor inlet pressure with the common refrigeration system that does not have injector variation size.This system can effectively improve the pressure of suction port of compressor working medium, reduces the pressure ratio of compressor, reduces consumption of compressor, thereby improves the performance of refrigeration system.And all have a certain amount of working medium to flow through evaporimeter refrigerating capacity is provided in the circulation at every turn; Owing to there is fixing fluid to flow through evaporimeter; When the performance of outer work condition variable effect injector; Guarantee that refrigeration system has fixing refrigerating capacity, made things convenient for the control of injector refrigerant system capacity, reduced the influence of external environment refrigeration system.
Embodiment 2:
As shown in Figure 4, present embodiment comprises: have the refrigeration system of injector, it is made up of compressor 10, condenser 20, expansion valve 40, gas-liquid separator 50, injector 60, expansion valve 70, evaporimeter 80.The annexation of each parts: compressor 10 links to each other with condenser 20, and condenser 20 links to each other with expansion valve 40 then, and expansion valve 40 is connected with gas-liquid separator 50 then; The gas vent of gas-liquid separator 50 is connected with injector 60 main flow imports then; And the liquid outlet of gas-liquid separator 50 is connected with expansion valve 70, and then expansion valve 70 is connected with evaporimeter 80, and evaporimeter 80 is connected with injector 60 gas injections inlet then; Injector 60 is connected with compressor 10 then, forms complete circulation.
Working medium becomes the gaseous state of HTHP after overcompression in compressor 10; Get into then and carry out condensation in the condenser 20; Pass through the throttling action of expansion valve 40 then, become gas-liquid two-phase and flow in the gas-liquid separator 50, working medium was divided into two-way and circulated respectively this moment; Wherein the working medium of gaseous state can be directly in the entering injector 60, the gaseous working medium that from evaporimeter 80, comes out as injector main flow injection; And liquid working medium can be carried out throttling through an expansion valve 70 more once more; Get into then in the evaporimeter 80 and evaporate, for the external world provides refrigerating capacity, working medium becomes gaseous state by in the injection entering injector 60 then; Mix with the gaseous working medium that comes out in the gas-liquid separator 50; Pass through the diffusion of injector 60 then, the boost in pressure of working medium is got back to then in the compressor 10 and has been accomplished circulation.
More than describe preferred embodiment of the present invention in detail.The ordinary skill that should be appreciated that this area need not creative work and just can design according to the present invention make many modifications and variation.Therefore, all technical staff in the art all should be in the determined protection domain by claims under this invention's idea on the basis of existing technology through the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (5)
1. the refrigeration system with injector comprises compressor, condenser, expansion valve, evaporimeter, injector, Intermediate Heat Exchanger, gas-liquid separator, first expansion valve and second expansion valve; Wherein, The outlet of compressor links to each other with the inlet of condenser, and the outlet of condenser is connected to the inlet of first expansion valve, and the outlet of first expansion valve is connected with the inlet of gas-liquid separator; The gas vent of gas-liquid separator is connected with the main flow import of injector; The liquid outlet of gas-liquid separator is connected with the inlet of second expansion valve, and the outlet of second expansion valve is connected with the inlet of evaporimeter, and the outlet of evaporimeter is connected with injector gas injection inlet; The outlet of injector is connected to the inlet of compressor, forms complete circulation.
2. the refrigeration system with injector according to claim 1 is characterized in that, also comprises Intermediate Heat Exchanger, and said Intermediate Heat Exchanger comprises first side and second side of mutual heat-shift; The outlet of condenser is connected with the inlet of Intermediate Heat Exchanger first side, and the outlet of Intermediate Heat Exchanger first side links to each other with the inlet of first expansion valve; The outlet of injector links to each other with the inlet of Intermediate Heat Exchanger second side, and the outlet of Intermediate Heat Exchanger second side is connected with the inlet of compressor.
3. the refrigeration system with injector according to claim 1; It is characterized in that; The main flow of described injector is that flow type pump with injection is the gaseous working medium that comes out from evaporimeter through the gaseous working medium behind the expansion valve, after the diffusion action through injector after two fluid streams are mixed; The pressure of working medium gets a promotion, thereby improves the pressure of suction port of compressor working medium.
4. the refrigeration system with injector according to claim 1 is characterized in that, described cold-producing medium is R134a, R404A, R22 or carbon dioxide.
5. refrigerating method; Be applicable to the refrigeration system with injector as claimed in claim 2; Said method comprises that working medium becomes the gaseous state of HTHP in compressor after overcompression, gets into then to carry out condensation in the condenser; Then working medium get in the Intermediate Heat Exchanger with injector in the working medium of coming out carry out heat exchange, become supercooled state; Pass through the throttling action of expansion valve then, become gas-liquid two-phase and flow in the gas-liquid separator; Working medium was divided into two-way and circulated respectively this moment, and wherein the working medium of gaseous state directly gets in the injector, the gaseous working medium that from evaporimeter, comes out as injector main flow injection; And liquid working medium is carried out throttling through an expansion valve more once more, gets into then and evaporates in the evaporimeter, for the external world provides refrigerating capacity; Working medium becomes gaseous state by in the injection entering injector then, mixes with the gaseous working medium that comes out in the gas-liquid separator; Pass through the diffusion of injector then, the boost in pressure of working medium, get in the Intermediate Heat Exchanger with condenser in the working medium of coming out carry out heat exchange, become superheat state, get back to then and accomplished circulation in the compressor.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103031115A (en) * | 2012-11-13 | 2013-04-10 | 常州大学 | Mixed refrigerant |
| CN103423812A (en) * | 2013-09-03 | 2013-12-04 | 王桂林 | Air conditioner not discharging heat outwards |
| CN104019508A (en) * | 2014-06-04 | 2014-09-03 | 上海理工大学 | High-temperature air-conditioning system |
| CN104089424A (en) * | 2014-07-04 | 2014-10-08 | 珠海格力电器股份有限公司 | Injection refrigeration cycle device |
| CN104501481A (en) * | 2014-12-18 | 2015-04-08 | 天津商业大学 | CO2 double-throttling injection refrigerating system |
| CN105928201A (en) * | 2016-05-20 | 2016-09-07 | 桂林航天工业学院 | Air source high-temperature heat pump |
| CN108895700A (en) * | 2018-07-19 | 2018-11-27 | 广东志高暖通设备股份有限公司 | A kind of multiple injection hot pump in low temp energy conserving system with injector |
| CN110173914A (en) * | 2019-06-24 | 2019-08-27 | 郑州轻工业学院 | For the injector of compression/injection refrigerating system reaction type automatic adjustment |
| CN110455000A (en) * | 2019-07-24 | 2019-11-15 | 中南大学 | Novel energy-conserving noise reduction cooling cycle system |
| CN113350814A (en) * | 2021-05-25 | 2021-09-07 | 哈尔滨工业大学 | Deep evaporation concentration system of jet compression type heat pump |
| CN113701389A (en) * | 2021-04-30 | 2021-11-26 | 中国科学院理化技术研究所 | Carbon dioxide refrigerating system and refrigerator of condensation separation type supersonic ejector |
| CN114739036A (en) * | 2022-03-21 | 2022-07-12 | 珠海格力电器股份有限公司 | Air-conditioning refrigeration system |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103031115A (en) * | 2012-11-13 | 2013-04-10 | 常州大学 | Mixed refrigerant |
| CN103423812A (en) * | 2013-09-03 | 2013-12-04 | 王桂林 | Air conditioner not discharging heat outwards |
| CN103423812B (en) * | 2013-09-03 | 2016-03-02 | 王桂林 | A kind of air-conditioner |
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| CN104089424A (en) * | 2014-07-04 | 2014-10-08 | 珠海格力电器股份有限公司 | Injection refrigeration cycle device |
| CN104501481A (en) * | 2014-12-18 | 2015-04-08 | 天津商业大学 | CO2 double-throttling injection refrigerating system |
| CN105928201A (en) * | 2016-05-20 | 2016-09-07 | 桂林航天工业学院 | Air source high-temperature heat pump |
| CN108895700A (en) * | 2018-07-19 | 2018-11-27 | 广东志高暖通设备股份有限公司 | A kind of multiple injection hot pump in low temp energy conserving system with injector |
| CN110173914A (en) * | 2019-06-24 | 2019-08-27 | 郑州轻工业学院 | For the injector of compression/injection refrigerating system reaction type automatic adjustment |
| CN110173914B (en) * | 2019-06-24 | 2024-05-07 | 郑州轻工业学院 | Feedback-type automatically-adjusted ejector for compression/injection refrigeration system |
| CN110455000A (en) * | 2019-07-24 | 2019-11-15 | 中南大学 | Novel energy-conserving noise reduction cooling cycle system |
| CN113701389A (en) * | 2021-04-30 | 2021-11-26 | 中国科学院理化技术研究所 | Carbon dioxide refrigerating system and refrigerator of condensation separation type supersonic ejector |
| CN113701389B (en) * | 2021-04-30 | 2022-11-01 | 中国科学院理化技术研究所 | Carbon dioxide refrigerating system and refrigerator of condensation separation type supersonic ejector |
| CN113350814A (en) * | 2021-05-25 | 2021-09-07 | 哈尔滨工业大学 | Deep evaporation concentration system of jet compression type heat pump |
| CN114739036A (en) * | 2022-03-21 | 2022-07-12 | 珠海格力电器股份有限公司 | Air-conditioning refrigeration system |
| CN114739036B (en) * | 2022-03-21 | 2023-02-28 | 珠海格力电器股份有限公司 | Air-conditioning refrigeration system |
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Application publication date: 20120620 |