CN109737622A - The two-stage Auto-cascade cycle low-temperature refrigeration circulating device and round-robin method of duplex injector synergy - Google Patents
The two-stage Auto-cascade cycle low-temperature refrigeration circulating device and round-robin method of duplex injector synergy Download PDFInfo
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- CN109737622A CN109737622A CN201811593998.5A CN201811593998A CN109737622A CN 109737622 A CN109737622 A CN 109737622A CN 201811593998 A CN201811593998 A CN 201811593998A CN 109737622 A CN109737622 A CN 109737622A
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Abstract
The invention discloses a kind of two-stage Auto-cascade cycle low-temperature refrigeration circulating device of duplex injector synergy and round-robin methods, compressor, condenser and I entrance of gas-liquid separator of the system are sequentially connected, the saturated gas obtained by gas-liquid separator I enters gas-liquid separator II by evaporative condenser I, and the saturated liquid that gas-liquid separator I obtains enters the nozzle of injector II；The gas that gas-liquid separator II obtains passes through evaporative condenser II, and regenerator, throttle valve and evaporator realize refrigeration, subsequently into the secondary inflow entrance of injector I；Gas-liquid separator II obtain liquid enter injector I nozzle mix and boost with the Secondary Flow for carrying out flash-pot after through regenerator, evaporative condenser II and evaporative condenser I are sequentially entered after the saturated liquid injection of gas-liquid separator I into injector II, eventually pass back to compressor.The expansion work of the abundant withdrawal liquid throttling process of duplex injector promotes suction pressure of compressor step by step, improves compressor and systematic entirety energy.
Description
Technical field
The invention belongs to refrigerators and refrigerator refrigeration technology field, and in particular to a kind of two-stage of duplex injector synergy from
Overlapping low-temperature refrigeration system and round-robin method.
Technical background
In recent years, with the continuous improvement of scientific and technological level, low-temperature refrigeration technology may not only be applied to traditional freezing and refrigeration
With food transport field, while the numerous areas such as bioengineering, therapeutic treatment application it is also increasingly extensive, especially for-
The demand of 80 DEG C of super low temperature refrigeration equipment below increasingly increases；In addition, energy conservation also has become low-temperature refrigeration technology with environmental protection
The main direction of development.Realize that the technological means of cryogenic refrigeration mainly has multi-stage compression circulation, mixed work medium for throttling circulation at present
And self-cascade refrigeration system.
Compared with other two kinds of technologies, auto-cascade refrigeration technology utilizes non-azeotropic mixed working medium Component Separation Performance of Ternary, passes through
Evaporative condenser realizes automatic cascade, can use single compressor and realizes multistage overlapping, to obtain low temperature refrigeration, has
There is the advantages that at low cost, cooling rate is fast, therefore there is biggish development potentiality in field of low-temperature refrigeration.In traditional Auto-cascade cycle system
There are biggish irreversible losses in system, are in its system first using caused by multiple throttle parts (capillary or throttle valve)
Irreversible loss, not only high-pressure working medium pressure energy is underutilized, at the same mechanical energy caused by the pressure loss be lost
Heat can be converted into and enter system, also, as low boiling working fluid concentration is higher, when cryogenic temperature is lower, chock pressure difference increases
Greatly, restriction loss is more obvious；Secondly as the Low temperature property requirements of system, suction pressure of compressor is lower, leads to compressor
Pressure ratio increases, and compressor volumetric efficiency reduces, and causes system performance lower, limits the development and application of the technology.
Pressure energy is converted kinetic energy and injection low pressure working fluid by injector, and kinetic energy is then then converted to pressure energy to improve
The equipment of low pressure working fluid pressure, structure is simple, and processing cost is lower, and its internal movement-less part, can preferably recycle
Expansion work, high reliablity and be suitable for gas-liquid two-phase fluid existing for operating condition；Moreover, injector can promote the air-breathing of compressor
Pressure reduces the pressure ratio of compressor, effectively improves system performance.Ejector applications are in -80 DEG C of ultralow temperature below at present
Still in the primary stage, method also more lacks for the application of refrigeration system.Injector is tool for two-stage Auto-cascade cycle low temperature refrigerator
There is biggish energy-saving potential, and realizes a new developing direction of -80 DEG C or less super low temperature refrigeration systems.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, proposes a kind of two-stage Auto-cascade cycle low temperature of duplex injector synergy
The demand of cryogenic refrigeration had both may be implemented in cooling cycle system and round-robin method, the system, can also improve the globality of system
Energy.
In order to achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of two-stage Auto-cascade cycle low-temperature refrigeration circulating device using dual jet synergy, the system include compressor 101,
Condenser 102, gas-liquid separator I 103, gas-liquid separator II 105, evaporative condenser I 104, evaporative condenser II 106, backheat
Device 107, throttle valve 108, evaporator 109, injector I 110 and injector II 111；
The outlet of the compressor 101 is connected with the import of condenser 102, the outlet of condenser 102 and gas-liquid separator I
103 import is connected；The saturated liquid outlet of gas-liquid separator I 103 is connected with the nozzle inlet of injector II 111, gas-liquid point
Gas vent from device I 103 is successively connected with the import of evaporative condenser I 104 and gas-liquid separator II 105；Gas-liquid separator
II 105 gas vent successively with evaporative condenser II 106, regenerator 107, throttle valve 108, evaporator 109 and injector I
110 secondary inflow entrance is connected；The liquid outlet of gas-liquid separator II 105 is connected with the nozzle inlet of injector I 110, and with
The a secondary fluid of injector I 110 realizes boost in pressure by mixing and diffusion process；Injector I 110 outlet successively with backheat
Device 107 is connected with the secondary inflow entrance of injector II 111, the saturated liquid from gas-liquid separator I 103 and injector II 111
Secondary Flow mixing, adherence pressure again；The outlet of injector II 111 successively with evaporative condenser II 106, evaporative condenser I
104 are connected with compressor 101, form complete refrigeration cycle.
The liquid of II 105 liquid outlet of gas-liquid separator enters I 110 injection of injector from evaporator 109
Refrigerant；The liquid of I 103 liquid outlet of gas-liquid separator enters what II 111 injection of injector was exported from injector I 110
Refrigerant；System can recycle expansion work twice and obtain higher boost in pressure ratio, compressor pressure ratio be reduced, so as to improve being
System performance.
Provided with evaporative condenser I 104 and evaporative condenser II 106, the refrigerant that injector II 111 exports respectively with steaming
The gas refrigerant that condenser I 104 and II 106 gas vent of evaporative condenser are discharged that feels cold is exchanged heat, and gas both can be improved
The concentration of low boiling working fluid in phase, facilitates the reduction of cryogenic temperature, also guarantees that compressor air suction process is superheat state, avoids
Compressor liquid hammer improves the reliability of system；Provided with regenerator 107, refrigerant before realize throttling refrigeration with spray
The fluid that device I 110 exports has carried out backheat, reduces degree of supercooling before throttle valve, facilitates the drop of 109 inlet temperature of evaporator
It is low, while can guarantee that by the refrigerant of II 111 2 inflow entrances of injector be single phase gas state, increase injector II
111 reliability.
A kind of round-robin method of the two-stage Auto-cascade cycle low-temperature refrigeration circulating device of duplex injector synergy, mixed working fluid
Become high temperature and high pressure gas by compressor 101, is condensed into two-phase state subsequently into condenser 102, is entered with two-phase state
Gas-liquid separator I 103, be rich in, the saturated gas of low boiling working fluid enters evaporative condenser I 104 becomes gas-liquid two-phase
State is separated subsequently into II 105 further progress component of gas-liquid separator, low boiling working fluid in the vapor phase refrigerant of acquisition
Concentration further increases, this strand of gas becomes subcooled liquid by evaporative condenser II 106 and regenerator 107, then through celebrating a festival
Stream valve 108 becomes low temperature two-phase-flow body and enters the realization cryogenic refrigeration of evaporator 109；Enter the Secondary Flow of injector I 110 later
Entrance, the liquid of gas-liquid separator II 105 enter in the nozzle of injector I 110 and with a secondary fluid by mixing and diffusion mistake
Journey becomes two-phase fluid, then becomes the secondary inflow entrance that single phase gas enters injector II 111, gas-liquid by regenerator 107
The liquid of separator I 103 enters in the nozzle of injector II 111 and with a secondary fluid by mixing and diffusion process, becomes two
Then phase fluid absorbs heat by evaporative condenser II 106 and evaporative condenser I 104, becomes overheated gas, be eventually returned to compress
Machine 101 realizes the two-stage Auto-cascade cycle cryogenic refrigeration circulation of complete duplex injector synergy.
Compared with existing injector synergy self-cascade refrigeration system, this recycles injector recycling gas-liquid separator I
103 and gas-liquid separator II 105 liquid throttling process expansion work, enhance the ejector capacity of injector, thus obtain it is higher
Boost in pressure ratio, reduce compressor pressure ratio, improve systematic entirety energy.Secondly, being provided with evaporative condenser I 104 and evaporation
Condenser II 106 facilitates the component separation of different boiling refrigerant, improves the concentration of low boiling working fluid in gas phase, favorably
In the reduction of cryogenic temperature, while air-breathing heat recovery process can guarantee that compressor air suction is superheat state, avoid compressor liquid hammer,
Improve the reliability of system；Provided with regenerator 107, refrigerant is before realizing throttling refrigeration and comes what injector I 110 exported
Fluid has carried out backheat, reduces degree of supercooling before throttle valve, facilitates the reduction of 109 inlet temperature of evaporator, while can protect
Card is single phase gas state by the refrigerant of II 111 2 inflow entrances of injector, increases the reliability of injector II 111.
Detailed description of the invention
Fig. 1 is that cooling cycle system of the present invention recycles schematic diagram.
Fig. 2 is pressure-enthalpy diagram (p-h figure) of the cooling cycle system course of work of the present invention.
Specific embodiment
In order to keep the objectives, technical solutions, and advantages of the present invention more clear and concise, implement below in conjunction with attached drawing and two kinds
Example, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to explain this hair
It is bright, it is not intended to limit the present invention.
Embodiment
As shown in Figure 1, the present embodiment is a kind of two-stage Auto-cascade cycle low-temperature refrigeration circulating device of duplex injector synergy, pressure
The outlet of contracting machine 101 is connected with the import of condenser 102, and the outlet of condenser 102 is connected with the import of gas-liquid separator I 103；
The saturated liquid outlet of gas-liquid separator I 103 is connected with the nozzle inlet of injector II 111, the gas of gas-liquid separator I 103
Outlet is successively connected with the import of evaporative condenser I 104 and gas-liquid separator II 105；The gas vent of gas-liquid separator II 105
Successively with the secondary inflow entrance phase of evaporative condenser II 106, regenerator 107, throttle valve 108, evaporator 109 and injector I 110
Even；The liquid outlet of gas-liquid separator II 105 is connected with the nozzle inlet of injector I 110, and the Secondary Flow with injector I 110
Body realizes boost in pressure by mixing and diffusion process；Injector I 110 outlet successively with regenerator 107 and injector II 111
Secondary inflow entrance be connected, the saturated liquid from gas-liquid separator I 103 is mixed with the Secondary Flow of injector II 111, is mentioned again
Boosting power；The outlet of injector II 111 is successively connected with evaporative condenser II 106, evaporative condenser I 104 and compressor 101,
Form complete refrigeration cycle.
Pressure-enthalpy diagram (p-h figure) of the cooling cycle system course of work of Fig. 2 embodiment.Specific work process of the invention
Are as follows: mixed working fluid becomes high temperature and high pressure gas (in Fig. 22 points) by compressor 101, subsequently into segregating in the middle part of condenser 102
Become two-phase state (in Fig. 23 points), gas-liquid separator I 103 entered with two-phase state, be rich in, low boiling working fluid it is full
Entering evaporative condenser I 104 with gas (in Fig. 25 points) becomes gas-liquid two-phase state (in Fig. 26 points), subsequently into gas-liquid separation
II 105 further progress component of device separates, and the concentration of low boiling working fluid further increases (in Fig. 2 in the vapor phase refrigerant of acquisition
10 points), this strand of gas becomes subcooled liquid (in Fig. 2 11 points) by evaporative condenser II 106 and regenerator 107, then passes through
Throttle valve 108 becomes low temperature two-phase-flow body (in Fig. 2 12 points) and enters the realization cryogenic refrigeration of evaporator 109 afterwards, becomes two-phase state
(in Fig. 2 13 points)；Enter the secondary inflow entrance (in Fig. 28 points) of injector I 110, the liquid (figure of gas-liquid separator II 105 later
7 points in 2) enter injector I 110 nozzle in (in Fig. 29 points), be then expanded to two-phase high-velocity fluid (7 ' point in Fig. 2) and with
A secondary fluid becomes two-phase fluid (in Fig. 2 14 points) by mixing and diffusion process, then becomes single-phase by regenerator 107
Gas enters the secondary inflow entrance of injector II 111, and the liquid (in Fig. 24 points) of gas-liquid separator I 103 is through injector II 111
Nozzle expansion is high speed two-phase fluid (4 ' point in Fig. 2), and becomes two-phase fluid by mixing and diffusion process with a secondary fluid
(in Fig. 2 17 points) then absorb heat (in Fig. 2 18 points) by evaporative condenser II 106 and evaporative condenser I 104 absorb heat, became
Hot gas (in Fig. 21 point), is eventually returned to compressor 101, realizes the two-stage Auto-cascade cycle low temperature system of complete duplex injector synergy
SAPMAC method.
Claims (4)
1. a kind of two-stage Auto-cascade cycle low-temperature refrigeration circulating device of duplex injector synergy, it is characterised in that: system includes compression
Machine (101), condenser (102), gas-liquid separator I (103), evaporative condenser I (104), gas-liquid separator II (105), evaporation
Condenser II (106), regenerator (107), throttle valve (108), evaporator (109), injector I (110) and injector II
(111)；
The outlet of the compressor (101) is connected with the import of condenser (102), the outlet and gas-liquid separation of condenser (102)
The import of device I (103) is connected；The nozzle inlet phase of the saturated liquid outlet and injector II (111) of gas-liquid separator I (103)
Even, the gas vent of gas-liquid separator I (103) the successively import with evaporative condenser I (104) and gas-liquid separator II (105)
It is connected；The gas vent of gas-liquid separator II (105) successively with evaporative condenser II (106), regenerator (107), throttle valve
(108), evaporator (109) is connected with the secondary inflow entrance of injector I (110)；The liquid outlet of gas-liquid separator II (105) with
The nozzle inlet of injector I (110) is connected, and with a secondary fluid of injector I (110) by mix and diffusion process, realization
Boost in pressure；Injector I (110) outlet is successively connected with the secondary inflow entrance of regenerator (107) and injector II (111), comes
It is mixed from the saturated liquid of gas-liquid separator I (103) with the Secondary Flow of injector II (111), again adherence pressure；Injector II
(111) outlet is successively connected with evaporative condenser II (106), evaporative condenser I (104) and compressor (101), is formed complete
Refrigeration cycle.
2. a kind of two-stage Auto-cascade cycle low-temperature refrigeration circulating device of duplex injector synergy according to claim 1, special
Sign is: the liquid of gas-liquid separator II (105) liquid outlet enters injector I (110) injection from evaporator
(109) refrigerant；The liquid of gas-liquid separator I (103) liquid outlet enters injector II (111) injection from injector
The refrigerant of I (110) outlet；System recycles the expansion work of two-way liquid using the principle of duplex injector and is promoted step by step than pressure
The higher boost in pressure ratio of contracting machine pressure of inspiration(Pi) reduces compressor pressure ratio, so as to improve system performance.
3. a kind of two-stage Auto-cascade cycle low-temperature refrigeration circulating device of duplex injector synergy according to claim 1, special
Sign is: being provided with evaporative condenser I (104) and evaporative condenser II (106), the refrigerant point of injector II (111) outlet
The gas refrigerant not being discharged with evaporative condenser I (104) and evaporative condenser II (106) gas vent is exchanged heat, both
The concentration for improving low boiling working fluid in gas phase, facilitates the reduction of cryogenic temperature, also guarantees that compressor air suction process is overheat shape
State avoids compressor liquid hammer, improves the reliability of system；Provided with regenerator (107), refrigerant is before realizing throttling refrigeration
Backheat has been carried out with the fluid from injector I (110) outlet, degree of supercooling before throttle valve (108) has been reduced, facilitates evaporator
(109) reduction of inlet temperature, while guaranteeing that by the refrigerant of the secondary inflow entrance of injector II (111) be single phase gas state,
Increase the reliability of injector II (111).
4. a kind of any one of claims 1 to 3 two-stage Auto-cascade cycle low-temperature refrigeration circulating device of duplex injector synergy
Round-robin method, it is characterised in that: mixed working fluid becomes high temperature and high pressure gas by compressor (101), subsequently into condenser
(102) be condensed into two-phase state, gas-liquid separator I (103) entered with two-phase state, be rich in, low boiling working fluid it is full
Entering evaporative condenser I (104) with gas becomes gas-liquid two-phase state, subsequently into gas-liquid separator II (105) further into
Row component separates, and the concentration of low boiling working fluid further increases in the vapor phase refrigerant of acquisition, this strand of gas passes through evaporative condenser
Device II (106) and regenerator (107) become subcooled liquid, then become low temperature two-phase-flow body by throttle valve (108) and enter
Evaporator (109) realizes cryogenic refrigeration, enters the secondary inflow entrance of injector I (110) later；Gas-liquid separator II (105)
Liquid enters in the nozzle of injector I (110) and with a secondary fluid by mixing and diffusion process, becomes two-phase fluid, then
Become the secondary inflow entrance that single phase gas enters injector II (111), the liquid of gas-liquid separator I (103) by regenerator (107)
Body enters in the nozzle of injector II (111) and with a secondary fluid by mixing and diffusion process, becomes two-phase fluid, then passes through
Pervaporation condenser II (106) and evaporative condenser I (104) heat absorption, become overheated gas, are eventually returned to compressor (101), real
The two-stage Auto-cascade cycle cryogenic refrigeration of now complete duplex injector synergy recycles.
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| CN201811593998.5A CN109737622B (en) | 2018-12-25 | 2018-12-25 | Two-stage auto-cascade low-temperature refrigeration cycle system and circulation method for enhancing efficiency of two-stage ejector |
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| CN201811593998.5A CN109737622B (en) | 2018-12-25 | 2018-12-25 | Two-stage auto-cascade low-temperature refrigeration cycle system and circulation method for enhancing efficiency of two-stage ejector |
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Cited By (3)
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| CN114623620A (en) * | 2022-02-28 | 2022-06-14 | 河南科技大学 | Double-temperature-position injection compression refrigeration cycle device with expander |
| CN115235135A (en) * | 2022-07-20 | 2022-10-25 | 北京航空航天大学 | Gas staged cooling liquefaction system based on vortex tube and ejector |
| CN116538699A (en) * | 2023-04-18 | 2023-08-04 | 西安交通大学 | CO (carbon monoxide) 2 Two-stage compression double-temperature refrigerating system |
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| CN116538699A (en) * | 2023-04-18 | 2023-08-04 | 西安交通大学 | CO (carbon monoxide) 2 Two-stage compression double-temperature refrigerating system |
| CN116538699B (en) * | 2023-04-18 | 2024-05-03 | 西安交通大学 | CO (carbon monoxide)2Two-stage compression double-temperature refrigerating system |
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