CN107940803A - Heat pump system and frequency converter cool-down method - Google Patents

Heat pump system and frequency converter cool-down method Download PDF

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Publication number
CN107940803A
CN107940803A CN201711167547.0A CN201711167547A CN107940803A CN 107940803 A CN107940803 A CN 107940803A CN 201711167547 A CN201711167547 A CN 201711167547A CN 107940803 A CN107940803 A CN 107940803A
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CN
China
Prior art keywords
flow path
supercooling
frequency converter
heat pump
pump system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201711167547.0A
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Chinese (zh)
Inventor
张治平
钟瑞兴
周宇
李宏波
周堂
蒋楠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN201711167547.0A priority Critical patent/CN107940803A/en
Publication of CN107940803A publication Critical patent/CN107940803A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00Heat pumps
    • F25B30/02Heat pumps of the compression type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B40/00Subcoolers, desuperheaters or superheaters
    • F25B40/02Subcoolers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

This application provides a kind of heat pump system and frequency converter cool-down method.The heat pump system includes condenser, evaporator, decompression flow path, boosting flow path, supercooling flow path and subcooler.Evaporator is connected by being depressured flow path and boosting flow path with condenser respectively, is depressured on flow path and is provided with frequency converter.Supercooling flow path is connected between condenser and evaporator, is subcooled on flow path and is provided with supercooling throttle valve.Subcooler is connected between the downstream of the supercooling throttle valve on supercooling flow path and the upstream of the frequency converter on decompression flow path, and supercooling flow path cools down the refrigerant before entering frequency converter on decompression flow path by subcooler.Apply the technical scheme of the present invention, reduce the influence for into the refrigerant temperature in frequency converter, thereby reducing refrigerant temperature for frequency converter electric elements inside, be effectively reduced the operating temperature of frequency converter, ensure the steady operation of frequency converter.

Description

Heat pump system and frequency converter cool-down method
Technical field
The present invention relates to technical field of heat pumps, in particular to a kind of heat pump system and frequency converter cool-down method.
Background technology
Heat pump has been more and more widely used in heat supply market, and demand water temperature is also higher and higher, even as high as 80 DEG C. Under so high water temperature, the condensation temperature of corresponding heating system needs 81 DEG C.It can ensure the high energy efficiency and fortune of heat pump to allow Line range is wide, in heat pump centrifuge the application of converter technique also increasingly popularize.
In order to make unit space small, function integrates, and frequency converter is often arranged on unit, namely what is often called " airborne frequency conversion Device ".The efficient operation of frequency converter and the cooling of its electric elements inside are closely related, will be direct if the temperature of frequency converter is excessive Influence the reliability of operation of electric element.
Therefore, in order to ensure the cooling of frequency converter electric elements inside, this frequency converter commonly uses refrigerant in the prior art Cooling.However, for 80 DEG C of so high leaving water temperatures, the pressure in condenser pipe is very high, and the cooling for frequency converter is non- Chang Buli.It is in particular in:Condensation temperature is high, and the unit mass refrigerating capacity in kind of refrigeration cycle is small, it is meant that required mass flow Institute's chilling requirement is can be only achieved greatly, it is unfavorable that efficiency is lifted;Universal 36 DEG C of cooling temperature is reduced to from so high condensation temperature, temperature Difference is excessive, if cooled down by reducing pressure by regulating flow, it is necessary to set multiple throttling arrangements, and throttling can cause flash gas, make Liquid coolant quantitative change is few, and cooling effect reduces, and is equally unfavorable for efficiency lifting.
The content of the invention
It is right in heat pump system in the prior art to solve the present invention provides a kind of heat pump system and frequency converter cool-down method The problem of cooling-down effect of frequency converter is poor.
The present invention provides a kind of heat pump system, including:Condenser;Evaporator, is flowed by being depressured flow path and boosting respectively Road is connected with condenser;Frequency converter, is arranged on decompression flow path;Heat pump system further includes:Flow path is subcooled, supercooling flow path is connected to Between condenser and evaporator;Throttle valve is subcooled, is arranged on supercooling flow path;Subcooler, is connected to the downstream of supercooling throttle valve Between the upstream of frequency converter, supercooling flow path cools down the refrigerant before entering frequency converter on decompression flow path by subcooler.
In one embodiment, the super-cooling pipeline that subcooler includes supercooling babinet and is arranged in supercooling babinet, supercooling Babinet is connected with decompression flow path, and super-cooling pipeline is connected with supercooling flow path;Alternatively, super-cooling pipeline is connected with decompression flow path, Supercooling babinet is connected with supercooling flow path.
In one embodiment, babinet is subcooled with decompression flow path to be connected, super-cooling pipeline is connected with supercooling flow path, mistake Cold pipeline is used to cool down to the refrigerant in supercooling babinet.
In one embodiment, heat pump system further includes decompression throttle valve, and decompression throttle valve is arranged on decompression flow path, And between subcooler and frequency converter.
In one embodiment, heat pump system further includes compressor, and compressor is arranged on boosting flow path.
In one embodiment, compressor is double-stage compressor, including the one stage of compression part and two-stage compression being connected Part, one stage of compression part are oppositely arranged on the upstream of two-stage compression part.
In one embodiment, heat pump system further includes economizer, and economizer is connected between condenser and evaporator, And the pipeline between one stage of compression part and two-stage compression part is connected.
In one embodiment, first throttle valve is provided between the upstream of economizer and condenser, under economizer Second throttle is provided between trip and condenser.
Present invention also offers a kind of frequency converter cool-down method, including:Cold flow was set between condenser and evaporator Road;The low temperature refrigerant being subcooled after being subcooled in flow path is allowed to cool down the high temperature refrigerant before entering frequency converter.
In one embodiment, before the low temperature refrigerant in supercooling flow path is by way of heat exchange to entering frequency converter High temperature refrigerant cools down.
In the inventive solutions, a supercooling flow path is set between condenser and evaporator, is saved by being subcooled The refrigerant that stream valve can allow in supercooling flow path cools down.Refrigerant temperature by throttle valve is subcooled will be lower than entering in decompression flow path Refrigerant temperature before frequency converter, the refrigerant that can be allowed by subcooler in supercooling flow path cool down the refrigerant in decompression flow path. So just reduce into the refrigerant temperature in frequency converter, thereby reduce refrigerant temperature for frequency converter internal electric member The influence of part, is effectively reduced the operating temperature of frequency converter, ensures the steady operation of frequency converter.
Brief description of the drawings
The attached drawing for forming the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention Apply example and its explanation is used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the overall structure figure of the embodiment of heat pump system according to the present invention;
Fig. 2 shows the application effect figure of heat pump system according to the present invention.
Wherein, above-mentioned attached drawing is marked including the following drawings:
10th, condenser;20th, evaporator;30th, it is depressured flow path;31st, frequency converter;32nd, it is depressured throttle valve;40th, boost flow path; 41st, compressor;411st, one stage of compression part;412nd, two-stage compression part;50th, flow path is subcooled;51st, throttle valve is subcooled;60th, subcooler; 61st, babinet is subcooled;62nd, super-cooling pipeline;70th, economizer;71st, first throttle valve;72nd, second throttle.
Embodiment
It is right with reference to embodiment and attached drawing for the object, technical solutions and advantages of the present invention are more clearly understood The present invention is described in further details.Here, the exemplary embodiment and its explanation of the present invention are used to explain the present invention, but simultaneously It is not as a limitation of the invention.
In view of the deficiencies in the prior art, the principle of the invention based on kind of refrigeration cycle, innovation propose a kind of heat pump system, compare In 2~5 DEG C in the prior art of degree of supercooling, degree of supercooling of the invention can be up to 44 DEG C.Refrigerant state is gone to by being subcooled Ordinary temperature is horizontal, enters back into frequency converter and is cooled down, forms brand-new cooling system.
The heat pump system is intended to the temperature for entering the refrigerant of frequency converter being reduced to the level of another order of magnitude, this is with adopting Different with the supercooling starting point of general refrigerating cycle, required telling on is also different.
Specifically, Fig. 1 shows the embodiment of the heat pump system of the present invention, which includes condenser 10, evaporation Device 20, decompression flow path 30, boosting flow path 40, supercooling flow path 50 and subcooler 60.Evaporator 20 is respectively by being depressured 30 He of flow path Boosting flow path 40 is connected with condenser 10, is depressured on flow path 30 and is provided with frequency converter 31.Supercooling flow path 50 is connected to condenser 10 Between evaporator 20, it is subcooled on flow path 50 and is provided with supercooling throttle valve 51.Subcooler 60 is connected to the mistake on supercooling flow path 50 Between the downstream of cold throttle valve 51 and the upstream of the frequency converter 31 on decompression flow path 30, supercooling flow path 50 is by subcooler 60 to drop The refrigerant entered on pressure flow path 30 before frequency converter 31 cools down.
Apply the technical scheme of the present invention, a supercooling flow path 50 is set between condenser 10 and evaporator 20, is passed through The refrigerant that supercooling throttle valve 51 can allow in supercooling flow path 50 cools down.It will be lower than dropping by the refrigerant temperature that throttle valve 51 is subcooled Press and enter the refrigerant temperature before frequency converter 31 in flow path 30, the refrigerant being subcooled in flow path 50 can be allowed by subcooler 60 to drop Press the refrigerant cooling in flow path 30.So just reduce into the refrigerant temperature in frequency converter 31, thereby reduce refrigerant Influence of the temperature for 31 electric elements inside of frequency converter, is effectively reduced the operating temperature of frequency converter 31, ensures frequency converter 31 Steady operation.
For the refrigerant temperature being further lowered into frequency converter 31, heat pump system further includes decompression throttle valve 32, drop Pressure throttle valve 32 is arranged on decompression flow path 30, and between subcooler 60 and frequency converter 31.Can by being depressured throttle valve 32 With to by subcooler 60 cool down refrigerant further cool down so that reduce further refrigerant temperature for frequency converter 31 inside The influence of electrical equipment.
Pass through above-mentioned structure:On the one hand the refrigerant fluid temperature cooled down for frequency converter 31 can decline to a great extent, but protect Hold pressure to be basically unchanged, temperature levels at this time are (generally 36 substantially as the temperature levels of conventional refrigerant condenser 10 DEG C), on the other hand degree of supercooling of the presently claimed invention just makes the mass dryness fraction of the vapor pres- sure line of force corresponding to the liquid after throttling be 0 Or be still located at the left side of 0 line of mass dryness fraction, i.e.,:Neat liquid feature is still kept, is steamed by the refrigerant that 60 side of flow path 50 and subcooler is subcooled The control of hair amount, this target can be realized.
As above effect caused by supercooling flow path 50 and subcooler 60 and control require entirely different with the prior art.Such as Shown in Fig. 2, the circulation that prior art frequency converter 31 cools down is 1 → 2 ' → 3 ' → 4 ', the circulation of frequency converter 31 of the invention cooling For 1 → 2 → 3 → 4.From circulation figure shape, shape is the same, but the purpose and effect that are actually carried out are entirely different.It is existing There is 31 cooling cycle of technology frequency converter, since 10 temperature and pressure of condenser is not high, commonly throttled by throttling arrangement Frequency converter 31 can be cooled down, but between 1 line of 0 line of mass dryness fraction and mass dryness fraction, i.e., the line after throttling is:Two-phase section, there are gas. And in the present invention, by being subcooled the supercooling of flow path 50 and subcooler 60, and by target control after, the liquid to have throttled is complete In 0 line of mass dryness fraction or leftward position.In this way, the unit mass refrigerating capacity of whole kind of refrigeration cycle is maximized, and without shwoot The generation of gas, makes the heat exchange into after frequency converter 31 more abundant.
As shown in Figure 1, as an alternative embodiment, in the present embodiment, subcooler 60 includes supercooling babinet 61 With the super-cooling pipeline 62 being arranged in supercooling babinet 61.Supercooling babinet 61 is connected with decompression flow path 30, super-cooling pipeline 62 and mistake Cold flow road 50 is connected, and super-cooling pipeline 62 is used to cool down to the refrigerant in supercooling babinet 61.It is connected with supercooling flow path 50 Super-cooling pipeline 62 in refrigerant temperature be less than with refrigerant temperature in the supercooling babinet 61 that is connected of decompression flow path 30, pass through and cross ice chest Refrigerant carries out heat exchange with super-cooling pipeline 62 in body 61, it is possible to reduces the refrigerant temperature in decompression flow path 30.
As other optional embodiments, super-cooling pipeline 62 can also be allowed to be connected with decompression flow path 30, and allowed Ice chest body 61 is connected with supercooling flow path 50.The refrigerant temperature in decompression flow path 30 equally can be reduced using heat exchange.
As shown in Figure 1, in the inventive solutions, heat pump system further includes compressor 41, compressor 41 is arranged on Boost on flow path 40.In use, the circulation of refrigerant can be realized to refrigerant pressurization by compressor 41.It is more highly preferred to, presses Contracting machine 41 is compound compressor, to increase the pressure of refrigerant as much as possible, improves the heat supply temperature of heat pump system.Optionally, exist In the technical solution of the present embodiment, compressor 41 is double-stage compressor, including the one stage of compression part 411 and two-stage compression being connected Part 412, one stage of compression part 411 are oppositely arranged on the upstream of two-stage compression part 412.
As shown in Figure 1, in order to enable it is more convenient for compressing into the refrigerant in compressor 41, heat pump system further includes economizer 70, economizer 70 is connected between condenser 10 and evaporator 20, and between one stage of compression part 411 and two-stage compression part 412 Pipeline connection.By economizer 70 a part of low temperature refrigerant can be allowed to enter one stage of compression part 411 and two-stage compression part 412 Between, allow what part low temperature refrigerant accelerated gaseous coolant in compressor 41 to be condensed into liquid refrigerants, and then contribute to two level pressure Contracting part 412 more efficiently pressurizes refrigerant.Preferably, it is provided with first segment between the upstream of economizer 70 and condenser 10 Valve 71 is flowed, second throttle 72 is provided between the downstream of economizer 70 and condenser 10.It can be dropped by first throttle valve 71 The low refrigerant temperature into economizer 70, and then help to allow the gas between one stage of compression part 411 and two-stage compression part 412 State refrigerant preferably condenses.The pressure of refrigerant in evaporator 20 can be lowered into by second throttle 72, contributes to refrigerant The evaporation endothermic in evaporator 20.
Present invention also offers a kind of frequency converter cool-down method, which is included in condenser 10 and evaporation Supercooling flow path 50 is set between device 20, makes the low temperature refrigerant being subcooled after being subcooled in flow path 50 cold to the high temperature before entering frequency converter 31 Matchmaker cools down.Using the frequency converter cool-down method of the present invention, the refrigerant temperature that can be effectively lowered into frequency converter 31, and then drop Low influence of the refrigerant temperature for 31 electric elements inside of frequency converter, is effectively reduced the operating temperature of frequency converter, ensures to become The steady operation of frequency device 31.It is more highly preferred to, the low temperature refrigerant in flow path 50 is subcooled by way of heat exchange into frequency conversion High temperature refrigerant before device 31 cools down.When in use, by being set between the flow path where supercooling flow path 50 and frequency converter 31 The subcooler 60 of a heat exchange is put to be exchanged heat.
The present invention inventive point be, in 31 cooling system of frequency converter using supercooling flow path 50 and subcooler 60 make high pressure, High temperature condensation temperature obtains abundant degree of supercooling up to 81 DEG C of refrigerant so that throttle still is to the refrigerant liquid corresponding to evaporating pressure Neat liquid characteristic, i.e.,:Positioned at the position that mass dryness fraction is 0, the generation of hair throttling process flash gas is avoided, then enters back into frequency converter 31 are cooled down, and at utmost play the specific refrigerating effect of kind of refrigeration cycle itself, lifting cooling efficiency.
Specifically, in the heat pump system of the present invention, condenser 10, evaporator 20 form to include boosting with compressor 41 to flow The major loop circulation of the Two-stage Compression of road 40 and decompression flow path 30, the high pressure for producing 10 side of condenser, height are circulated by major loop Low-pressure steam after wet body and the heat exchange of 20 side of evaporator, then produces required 80 DEG C of hot water by the heat exchange of condenser 10. The present invention is built in above-mentioned major loop round-robin basis, 60 part of additional supercooling flow path 50 and subcooler.
The major loop circulation order of connection is followed successively by:10 → subcooler of condenser 60 → 32 → frequency converter of decompression throttle valve 31 → 20 → compressor of evaporator, 41 → condenser 10.
The order of connection of supercooling flow path 50 is followed successively by:Condenser 10 → supercooling throttle valve 51 → subcooler, 60 → evaporator 20。
This measure is subcooled in ingenious make use of of technical scheme, and high temperature and pressure liquid refrigerant first is down to common system Cold level, and the liquid condition of reducing pressure by regulating flow is controlled, it is used in the 31 coolant flat quality refrigerating capacity of frequency converter of heat pump system Maximize, required cooling flow is minimum, so as to achieve the purpose that improving energy efficiency.
Apply the technical scheme of the present invention, achieve that:
1st, solve the problems, such as that high-temperature water outlet state low-converter cools down;
2nd, unit mass refrigerating capacity, cold medium flux needed for reduction, improving energy efficiency are improved from kind of refrigeration cycle itself;
3rd, the generation of throttling process flash gas is reduced, ensures pure refrigerant characteristics of liquids, improves heat transfer effect.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this area For art personnel, the embodiment of the present invention can have various modifications and variations.Within the spirit and principles of the invention, made Any modification, equivalent substitution, improvement and etc., should all be included in the protection scope of the present invention.

Claims (10)

1. a kind of heat pump system, including:
Condenser (10);
Evaporator (20), is connected by being depressured flow path (30) and boosting flow path (40) with the condenser (10) respectively;
Frequency converter (31), is arranged on the decompression flow path (30);
It is characterized in that, the heat pump system further includes:
Flow path (50) is subcooled, the supercooling flow path (50) is connected between the condenser (10) and the evaporator (20);
Throttle valve (51) is subcooled, is arranged on the supercooling flow path (50);
Subcooler (60), is connected between the downstream of the supercooling throttle valve (51) and the upstream of the frequency converter (31), described Flow path (50) is subcooled by the subcooler (60) to the refrigerant before entering the frequency converter (31) on the decompression flow path (30) Cool down.
2. heat pump system according to claim 1, it is characterised in that the subcooler (60) include supercooling babinet (61) and The super-cooling pipeline (62) being arranged in the supercooling babinet (61), the supercooling babinet (61) are connected with the decompression flow path (30) Logical, the super-cooling pipeline (62) is connected with the supercooling flow path (50);Alternatively, the super-cooling pipeline (62) is flowed with the decompression Road (30) is connected, and the supercooling babinet (61) is connected with the supercooling flow path (50).
3. heat pump system according to claim 2, it is characterised in that the supercooling babinet (61) and the decompression flow path (30) it is connected, the super-cooling pipeline (62) is connected with the supercooling flow path (50), and the super-cooling pipeline (62) is used for institute The refrigerant stated in supercooling babinet (61) cools down.
4. heat pump system according to claim 1 or 2, it is characterised in that the heat pump system further includes decompression throttle valve (32), the decompression throttle valve (32) is arranged on the decompression flow path (30), and positioned at the subcooler (60) and the change Between frequency device (31).
5. heat pump system according to claim 1, it is characterised in that the heat pump system further includes compressor (41), institute Compressor (41) is stated to be arranged on the boosting flow path (40).
6. heat pump system according to claim 1, it is characterised in that the compressor (41) is double-stage compressor, including The one stage of compression part (411) and two-stage compression part (412) being connected, the one stage of compression part (411) are oppositely arranged on described two The upstream of level compression piece (412).
7. heat pump system according to claim 6, it is characterised in that the heat pump system further includes economizer (70), institute Economizer (70) is stated to be connected between the condenser (10) and the evaporator (20), and with the one stage of compression part (411) Pipeline connection between the two-stage compression part (412).
8. heat pump system according to claim 7, it is characterised in that the upstream of the economizer (70) and the condenser (10) first throttle valve (71) is provided between, is provided between the downstream of the economizer (70) and the condenser (10) Two throttle valves (72).
A kind of 9. frequency converter cool-down method, it is characterised in that including:
Supercooling flow path (50) is set between condenser (10) and evaporator (20);
The low temperature refrigerant allowed after the middle supercooling of supercooling flow path (50) cools down the high temperature refrigerant before entering frequency converter (31).
10. frequency converter cool-down method according to claim 9, it is characterised in that the low temperature in the supercooling flow path (50) Refrigerant is by way of heat exchange to cooling down into the high temperature refrigerant before frequency converter (31).
CN201711167547.0A 2017-11-21 2017-11-21 Heat pump system and frequency converter cool-down method Pending CN107940803A (en)

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Publication number Priority date Publication date Assignee Title
CN109000392A (en) * 2018-08-27 2018-12-14 珠海格力电器股份有限公司 A kind of frequency converter cooling means of air conditioner cold water unit, air conditioner cold water unit and air-conditioning
CN114352551A (en) * 2022-02-17 2022-04-15 广东美的白色家电技术创新中心有限公司 Multistage compressor and heat pump system

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