CN103776189B - Tonifying Qi for the band injector of heat pump assembly increases enthalpy type heat pump circulating system - Google Patents

Tonifying Qi for the band injector of heat pump assembly increases enthalpy type heat pump circulating system Download PDF

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CN103776189B
CN103776189B CN201410022664.8A CN201410022664A CN103776189B CN 103776189 B CN103776189 B CN 103776189B CN 201410022664 A CN201410022664 A CN 201410022664A CN 103776189 B CN103776189 B CN 103776189B
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injector
outlet
heat pump
compressor
flash vessel
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CN103776189A (en
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鱼剑琳
王骁
邢美波
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Xian Jiaotong University
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Xian Jiaotong University
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Abstract

A kind of tonifying Qi of the band injector for heat pump assembly increases enthalpy type heat pump circulating system, the outlet of compressor is connected with the entrance of condenser, condensator outlet is connected with the nozzle entrance of injector, being connected with second level flash vessel gaseous phase outlet by injection refrigerant inlet of injector, injector outlet is connected with first order flash vessel entrance; The saturated gaseous state refrigerant outlet of first order flash vessel is connected with compressor second vapor injection mouth, and saturated liquid refrigerant outlet is connected with second level flash vessel entrance after first order expansion valve or capillary; The saturated gaseous state refrigerant outlet of second level flash vessel and being connected by injection refrigerant inlet of injector, saturated liquid refrigerant outlet is connected with evaporator inlet after second level expansion valve or capillary; Evaporator outlet is connected with compressor air suction mouth; Reclaimed by the expansion work adopting injector and auxiliary flash vessel to realize throttling process, increase compressor intergrade air compensation simultaneously, thus improve heat pump heating performance.

Description

Tonifying Qi for the band injector of heat pump assembly increases enthalpy type heat pump circulating system
Technical field
The invention belongs to technical field of heat pumps, the tonifying Qi being specifically related to a kind of band injector for heat pump assembly increases enthalpy type heat pump circulating system.
Background technology
The confession that steam compression type air source heat pump technology is applied to commercial building and house more and more as a kind of technology that heats of energy-saving and environmental protection is hankered, as heat pump type air conditioner and Teat pump boiler.Along with the raising of economic development and living standards of the people, air source heat pump is very rapid in the development of China, and the research of correlation technique is also being constantly brought forth new ideas.But, when steam compression type air source heat pump is used under lower outdoor air environment temperature, compressor suction and discharge pressure reduction increases, the density of the cold-producing medium that compressor sucks reduces, the circular flow of heat pump internal refrigeration storage agent reduces, the heat that causes heat pump to provide to indoor reduces, and it is the outstanding technical problem that it exists that the decay of heat pump heating performance and efficiency and heating capacity reduce, thus affects it and apply on a large scale.For making air source heat pump efficient, safe operation in low temperature environment, people have carried out many technical researches and improvement, and what wherein application was at present more is the circulatory system adopting band tonifying Qi to increase enthalpy, also known as air injection enthalpy-increasing system.In a word, applying tonifying Qi increasing enthalpy system is one of effective technical way solving net for air-source heat pump units cold operation hydraulic performance decline.
At present, conventional tonifying Qi increases enthalpy type heat pump circulating system and mainly comprises compressor, condenser, evaporimeter, flash vessel and the parts such as expansion valve or capillary; Wherein, compressor is screw compressor or the two-stage rolling rotor compressor with tonifying Qi enthalpy-increasing function, and its compression process is divided into two sections by tonifying Qi process, and become to be as the criterion two-stage compression process.But, increase in enthalpy type heat pump circulating system in existing tonifying Qi, because the expansion process realizing cold-producing medium still mainly adopts throttle mechanism expansion valve or capillary, thus larger irreversible loss is created in its throttling process, and strengthen along with evaporating temperature reduces irreversible loss, cause circulatory system performance significantly to reduce.In fact, the throttling process of cold-producing medium has available expansion work, can increase in enthalpy type heat pump circulating system in current tonifying Qi adopt additional injector to reclaim the demi-inflation merit of throttling process, the performance of the circulatory system is obtained and improves, and improves heating performance attenuation under low temperature environment.
Much research shows, vapor-compression cycle system adopts injector really can improve the performance of refrigeration and heat pump assembly.But at present about the application of injector in vapor-compression cycle system, great majority are the one-stage steam compressed formula circulatory systems for routine.Generally speaking, also there is blank in the technical measures of application sprayers in tonifying Qi increasing enthalpy type heat pump circulating system.
Summary of the invention
For solving above-mentioned problems of the prior art, the tonifying Qi for the band injector of heat pump assembly is the object of the present invention is to provide to increase enthalpy type heat pump circulating system, by the expansion work adopting injector to reclaim throttling process, thus make the tonifying Qi of band injector increasing enthalpy type heat pump circulating system have higher efficiency, reduce EGR energy ezpenditure; And utilize the gaseous refrigerant in the flash vessel of the injector injection second level, add the air compensation of compressor intergrade, efficiently solve the heating capacity attenuation problem of air source heat pump system when low ambient temperature further.
For achieving the above object, the technical solution adopted in the present invention is:
A kind of tonifying Qi of the band injector for heat pump assembly increases enthalpy type heat pump circulating system, comprise compressor 101, the outlet of compressor 101 is connected with the entrance of condenser 102, the outlet of condenser 102 is connected with the nozzle entrance of injector 103, being connected by the gaseous phase outlet of injection refrigerant inlet with second level flash vessel 106 of injector 103, the outlet of injector 103 is connected with the entrance of first order flash vessel 104; First order flash vessel 104 exports a point two-way, one road saturated gaseous state refrigerant outlet is connected with the middle complemental air mouth of compressor 101, and the saturated liquid refrigerant outlet in another road is connected with second level flash vessel 106 entrance after first order expansion valve or capillary 105; Second level flash vessel 106 exports a point two-way, the one saturated gaseous state refrigerant outlet in road is connected by injection refrigerant inlet with injector 103, and the saturated liquid refrigerant outlet in another road is connected with evaporimeter 108 entrance after second level expansion valve or capillary 107; Evaporimeter 108 outlet is connected with compressor 101 air entry.
Described compressor 101 adopts the compressor with tonifying Qi enthalpy-increasing function, and it has two-stage air entry, is respectively low pressure air suction mouth and second vapor injection mouth.
The described compressor with tonifying Qi enthalpy-increasing function is screw compressor or two-stage rolling rotor compressor.
Carry out the sub-cooled liquid refrigerant pressure that condenser 102 exports in described injector 103 to be greater than from second level flash vessel 106 gaseous phase outlet refrigerant vapour pressure out.
The refrigerant vapour of described second level flash vessel 106 gaseous phase outlet is by the sub-cooled liquid refrigerant injection carrying out condenser 102 and export in injector 103, and in injector 103, after mixing, supercharging also enters first order flash vessel 104.
Enthalpy type heat pump circulating system is increased compared to existing tonifying Qi, a kind of tonifying Qi with injector that the present invention proposes increases enthalpy type heat pump circulating system, by the expansion work adopting injector to reclaim throttling process, thus make the tonifying Qi of the band injector increasing enthalpy air source heat pump circulatory system have higher efficiency, reduce heat pump energy ezpenditure.Meanwhile, utilize the gaseous refrigerant in the flash vessel of the injector injection second level, add the air compensation of compressor intergrade, efficiently solve the heating capacity attenuation problem of air source heat pump system when low ambient temperature further.This system is a kind of economy, effective, feasible improving countermeasure, can effectively improve heat pump circulating system performance, can promote the development of heat pump product power-saving technology.
Accompanying drawing explanation
Fig. 1 is cooling cycle system schematic diagram of the present invention.
Fig. 2 is the circulation pressure-enthalpy diagram (p – h schemes) of the cooling cycle system course of work of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, the tonifying Qi of a kind of band injector for heat pump assembly of the present invention increases enthalpy type heat pump circulating system, comprise compressor 101, the outlet of compressor 101 is connected with the entrance of condenser 102, the outlet of condenser 102 is connected with the nozzle entrance of injector 103, being connected by the gaseous phase outlet of injection refrigerant inlet with second level flash vessel 106 of injector 103, the outlet of injector 103 is connected with the entrance of first order flash vessel 104; First order flash vessel 104 exports a point two-way, one road saturated gaseous state refrigerant outlet is connected with the middle complemental air mouth of compressor 101, and the saturated liquid refrigerant outlet in another road is connected with second level flash vessel 106 entrance after first order expansion valve or capillary 105; Second level flash vessel 106 exports a point two-way, the one saturated gaseous state refrigerant outlet in road is connected by injection refrigerant inlet with injector 103, and the saturated liquid refrigerant outlet in another road is connected with evaporimeter 108 entrance after second level expansion valve or capillary 107; Evaporimeter 108 outlet is connected with compressor 101 air entry.
Described compressor 101 adopts the compressor with tonifying Qi enthalpy-increasing function, and it has two-stage air entry, is respectively low pressure air suction mouth and second vapor injection mouth.
As the preferred embodiment of the present invention, described in there is tonifying Qi enthalpy-increasing function compressor be screw compressor or two-stage rolling rotor compressor.
As the preferred embodiment of the present invention, carry out the sub-cooled liquid refrigerant pressure that condenser 102 exports in described injector 103 and be greater than from second level flash vessel 106 gaseous phase outlet refrigerant vapour pressure out.Such high pressure sub-cooled liquid refrigerant enter as working fluid in the nozzle of injector 103 pressure energy is converted into speed can after become low-voltage high speed gas-liquid two-phase mix refrigerant, thus injection is from second level flash vessel 106 gaseous phase outlet refrigerant vapour out, and at the gas-liquid two-phase mix refrigerant of injector outlet mineralization pressure higher than the refrigerant vapour of second level flash vessel 106 gaseous phase outlet, reach the object improving the low energy consumption of compressor second vapor injection Pressure Drop.
As the preferred embodiment of the present invention, the refrigerant vapour of described second level flash vessel 106 gaseous phase outlet is by the sub-cooled liquid refrigerant injection carrying out condenser 102 and export in injector 103, and in injector 103, after mixing, supercharging also enters first order flash vessel 104.Which increase the air compensation of compressor intergrade, efficiently solve the heating capacity attenuation problem of air source heat pump system when low ambient temperature further.
As shown in Figure 2, for the circulation pressure-enthalpy diagram (p – h schemes) of the cooling cycle system course of work of the present invention, the refrigeration system course of work of its signal is: the overheated gaseous refrigerant of HTHP (in figure 2 places) that compressor 101 exports is released after heat realizes heating object at condenser 102 becomes high pressure sub-cooled liquid refrigerant (in figure 3 places), the sub-cooled liquid refrigerant that condenser 102 exports enters the nozzle of injector 103 as working fluid, become low-voltage high speed gas-liquid two-phase mix refrigerant (in figure 3 ' some place) after expanding in nozzle, low-voltage high speed gas-liquid two-phase mix refrigerant with mix in the mixing chamber of injector 103 from second level flash vessel 106 saturated gaseous refrigerant (in figure 8) out after (in figure 4 ' some place) become after gas-liquid two-phase mix refrigerant (locating for 4 in figure) through the diffuser supercharging of injector 103 again and discharge, the gas-liquid two-phase mix refrigerant that injector 103 exports enters first order flash vessel 104 and carries out gas-liquid separation, the second vapor injection mouth of compressor 101 is wherein returned at 5 from the isolated saturated gaseous refrigerant of first order flash vessel 104 (in figure), and isolated saturated liquid refrigerant (in figure 6 places) is entered in second level flash vessel 106 carried out gas-liquid separation by (in figure 7 place) after first order expansion valve or capillary 105 step-down cooling, wherein from the isolated saturated gaseous refrigerant of second level flash vessel 106 (in figure 8) as the injection entrance being entered injector 103 by injection cold-producing medium, and isolated saturated liquid refrigerant (in figure 9 places) is entered in evaporimeter 108 evaporation of absorbing heat become 1 place in gaseous refrigerant figure by (in figure 10 place) after second level expansion valve or capillary 107 step-down cooling), the gaseous refrigerant that evaporimeter 108 exports enters compressor 101 air entry, more than completes whole cyclic process.
Having four different operating pressures in whole system On The Cycle Working Process of the present invention, is condenser 102 condensing pressure, compressor 101 second vapor injection pressure, the citation jet body pressure of injector 103 and evaporimeter 108 evaporating pressure successively.Wherein condenser 102 condensing pressure and evaporimeter 108 evaporating pressure are determined (i.e. a condensation temperature and an evaporating temperature) by the work operating mode of the circulatory system, and this depends on again and heats temperature requirement and air ambient temperature; Compressor 101 second vapor injection pressure is design conditions parameter, can choose according to condensing pressure and evaporating pressure; The citation jet body pressure of injector 103 determined by the conservation of mass, the conservation of momentum and the energy conservation relation in the operating characteristic of injector 103, circulation.

Claims (4)

1. the tonifying Qi for the band injector of heat pump assembly increases enthalpy type heat pump circulating system, comprise compressor (101), the outlet of compressor (101) is connected with the entrance of condenser (102), it is characterized in that: the outlet of condenser (102) is connected with the nozzle entrance of injector (103), being connected by the gaseous phase outlet of injection refrigerant inlet with second level flash vessel (106) of injector (103), the outlet of injector (103) is connected with the entrance of first order flash vessel (104); First order flash vessel (104) outlet point two-way, the one saturated gaseous state refrigerant outlet in road is connected with complemental air mouth in the middle of compressor (101), and the saturated liquid refrigerant outlet in another road is connected with second level flash vessel (106) entrance after first order expansion valve or capillary (105); Second level flash vessel (106) outlet point two-way, the one saturated gaseous state refrigerant outlet in road is connected by injection refrigerant inlet with injector (103), and the saturated liquid refrigerant outlet in another road is connected with evaporimeter (108) entrance after second level expansion valve or capillary (107); Evaporimeter (108) outlet is connected with compressor (101) air entry; Carry out sub-cooled liquid refrigerant pressure that condenser (102) exports in described injector (103) to be greater than from second level flash vessel (106) gaseous phase outlet refrigerant vapour pressure out.
2. the tonifying Qi of the band injector for heat pump assembly according to claim 1 increases enthalpy type heat pump circulating system, it is characterized in that: described compressor (101) adopts the compressor with tonifying Qi enthalpy-increasing function, it has two-stage air entry, is respectively low pressure air suction mouth and second vapor injection mouth.
3. the tonifying Qi of the band injector for heat pump assembly according to claim 2 increases enthalpy type heat pump circulating system, it is characterized in that: described in there is tonifying Qi enthalpy-increasing function compressor be screw compressor or two-stage rolling rotor compressor.
4. the tonifying Qi of the band injector for heat pump assembly according to claim 1 and 2 increases enthalpy type heat pump circulating system, it is characterized in that: the refrigerant vapour of described second level flash vessel (106) gaseous phase outlet is by the sub-cooled liquid refrigerant injection carrying out condenser (102) and export in injector (103), and in injector (103), after mixing, supercharging also enters first order flash vessel (104).
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CN104949372B (en) * 2015-05-29 2017-10-13 浙江工业大学 New type of compression secondary injection refrigeration system with gas-liquid separator
US10533793B2 (en) 2015-11-09 2020-01-14 Bechtel Hydrocarbon Technology Solutions, Inc. Systems and methods for multi-stage refrigeration
CN105627608B (en) * 2016-01-13 2017-11-28 西安交通大学 A kind of Auto-cascade cycle steam compressed refrigerating circulating system of gas gas blowout emitter synergy
CN106152582A (en) * 2016-07-11 2016-11-23 格力电器(芜湖)有限公司 A kind of air conditioning system
CN108007012B (en) * 2017-11-29 2019-06-21 浙江海洋大学 A kind of multi-stage temperature refrigerator refrigerating plant and its refrigerating method using jet pump
CN109682100B (en) * 2018-11-02 2020-12-15 浙江理工大学 Utilize spray tube, diffuser pipe to reduce exhaust temperature's doublestage compression refrigerating system
CN110319612A (en) * 2019-06-29 2019-10-11 西安交通大学 The carbon dioxide two-stage refrigeration circulatory system and its working method of injector synergy

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