CN208735965U - Primary throttling two-stage compression heat pump system - Google Patents

Primary throttling two-stage compression heat pump system Download PDF

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Publication number
CN208735965U
CN208735965U CN201821150651.9U CN201821150651U CN208735965U CN 208735965 U CN208735965 U CN 208735965U CN 201821150651 U CN201821150651 U CN 201821150651U CN 208735965 U CN208735965 U CN 208735965U
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China
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interface
valve
pressure stage
way
low
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Expired - Fee Related
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CN201821150651.9U
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Chinese (zh)
Inventor
杨永安
李瑞申
严雷
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Tianjin University of Commerce
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Tianjin University of Commerce
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Abstract

The utility model discloses a kind of primary throttling two-stage compression heat pump systems, using the Two-stage Compression heating circulation with low-pressure stage compressor Defrost when being intended to provide a kind of heat supply in winter, using the primary throttling two-stage compression heat pump system of single stage compress refrigeration cycle when summer cooling.Including high pressure stage compressor group, indoor heat exchanger, first throttle valve, the second two-way valve, third two-way valve, economizer and multiple low-pressure stage units;Each low-pressure stage unit includes low-pressure stage compressor, four-way reversing valve, second throttle, outdoor heat exchanger, the first two-way valve, the first check valve, second one-way valve and third check valve.Realize that winter once throttles Two-stage Compression heating/defrosting circulation, winter without defrosting function single stage compress heating circulation and summer single stage compress refrigeration cycle by the interface transformation of the first two-way valve, the opening and closing of the second two-way valve and third two-way valve and four-way reversing valve.For the system by reverse cycle defrosting, defrosting efficiency is high, and temperature fluctuation is small.

Description

Primary throttling two-stage compression heat pump system
Technical field
The utility model relates to refrigeration technology field, more specifically, it relates to a kind of seasons to use hot gas for outdoor heat exchange The primary throttling Two-stage Compression of device wheel stream defrosting heats circulation, and summer uses the primary throttling twin-stage pressure of single stage compress refrigeration cycle Contracting heat pump system.
Background technique
Air source heat pump is one kind based on low-temperature heat source, is produced using the low grade heat energy in air higher than environment temperature The hot water of degree or the energy saver of air.Air-source as its rich reserves of low level heat energy, and with traditional heat-supplying mode phase Than air source heat pump not only reduces energy consumption, but also reduces environmental pollution.Air source heat pump technology is promoted in energy-saving and emission-reduction, protection environment Aspect is with a wide range of applications.The operation of air source heat pump is affected by the epidemic disaster of ambient enviroment, in cold district Or the heating efficiency of runtime system low restricts its promoted extension and development speed with frosting problem under extreme weather conditions.
Traditional heat pump system in winter heat supply when generally use single stage compress recycle or quasi- twin-stage (air injection enthalpy-increasing) heat Pump circulation, both heat pump systems have the disadvantage that: first is that changing four-way reversing valve when for outdoor heat exchanger Defrost method Connection type makes working medium adverse current, and outdoor heat exchanger is converted to condenser, and indoor heat exchanger is converted to evaporator, the heat of defrosting From indoor and compressor work consuming, therefore in defrosting, room temperature is reduced, and indoor Thermal comfort reduces, and heat supply occurs Interruption, can not achieve as indoor continuous heat supply;Second is that due to the raising of people's quality of life, to living environment it is also proposed that new wants It asks, for example summer people require cooling supply, winter some users require to shift to an earlier date heat supply, and some users but require to postpone heat supply, even It also proposed different degrees of requirement to cold and heat supply in spring and autumn people, but both heat pump system heat supply modes are more single One, in winter under the extremely low ambient temperature conditions of cold district short time, it can not achieve high efficiency heat supply.
Utility model content
The purpose of this utility model is for technological deficiency existing in the prior art, and while providing a kind of heat supply in winter adopts Circulation is heated with the Two-stage Compression with low-pressure stage compressor Defrost, using the one of single stage compress refrigeration cycle when summer cooling Secondary throttling two-stage compression heat pump system.
It is for technical solution used by realization the purpose of this utility model:
A kind of primary throttling two-stage compression heat pump system, including high pressure stage compressor group, indoor heat exchanger, first throttle Valve, the second two-way valve, third two-way valve, economizer and multiple low-pressure stage units;Each low-pressure stage unit includes low-pressure stage Compressor, four-way reversing valve, second throttle, outdoor heat exchanger, the first two-way valve, the first check valve, second one-way valve and Three check valves;The suction end of the low-pressure stage compressor is connect with the 4th interface of the four-way reversing valve, the low-pressure stage pressure The exhaust end of contracting machine is connect with the second interface of the four-way reversing valve, the third interface of the four-way reversing valve respectively with it is described The import of first check valve and the outlet of second one-way valve connection, the first interface of the four-way reversing valve is through the outdoor Heat exchanger is connect with the first interface of the second throttle, the second interface of the second throttle respectively with the third list Outlet to valve is connected with the first interface of first two-way valve;The inlet parallel of the third check valve together and with institute State the first interface connection of economizer, the second interface of first two-way valve is divided into two-way after being connected in parallel, all the way with institute State the 4th interface connection of economizer, another way respectively with the second interface of the indoor heat exchanger and the first throttle valve First interface connection;The outlet of first check valve, the import of the second one-way valve and the high pressure stage compressor group Suction end it is in parallel respectively after be connected to the first interface of second two-way valve, the second interface of second two-way valve and institute State the second interface connection of economizer;The exhaust end of the high pressure stage compressor group and the first interface of the indoor heat exchanger connect It connects, the second interface of the first throttle valve is connect with the third interface of the economizer;The both ends of the third two-way valve are simultaneously Connection is connected to the suction end and exhaust end of the high pressure stage compressor group;Pass through the first two-way valve, the second two-way valve and third two The transformation of the interface of the opening and closing of port valve and four-way reversing valve realize winter once throttle Two-stage Compression heating/defrosting circulation, winter without The function single stage compress that defrosts heating circulation and summer single stage compress refrigeration cycle.
The high pressure stage compressor group includes one or more high pressure stage compressor, when using more high pressure stage compressors When, suction end of the air-breathing interface parallel connection of every high pressure stage compressor as the high pressure stage compressor group, described in every Exhaust end of the exhaust port parallel connection of high pressure stage compressor as the high pressure stage compressor group.
Compared with prior art, the utility model has the beneficial effects that
1, the heat pump system of the utility model by the switching of valve may be implemented winter once throttle Two-stage Compression heating/ Defrosting circulation, winter are without defrosting function single stage compress heating circulation and summer single stage compress refrigeration cycle.In defrost mode, real The low-pressure stage compressor for the function that now defrosts is converted into high pressure stage compressor operation, realizes low in the low-pressure stage unit of defrosting function Warm compressor is absorbed presses through heat steam in the low-pressure stage compressor for realizing heat-production functions, realizes that the inverse of low-pressure stage unit follows Ring defrosting, defrosting circulation is two-stage compression cycle with heating circulation, and then forms a dynamical system, and temperature fluctuation is small, removes Frost is high-efficient, energy saving.Meanwhile compressor can stable operation, improve the service life of system.
2, the utility model defrosting of the outdoor heat exchanger in two-stage compression heat pump system that once throttles uses inverse circulating heat pump Defrosting, outdoor heat exchanger can take turns shelves defrosting, and when realizing outdoor heat exchange defrosting, the lasting heat supply of indoor heat exchanger is increased The comfort of indoor environment temperature when outdoor heat exchange defrosts.
3, the utility model defrosting of the outdoor heat exchanger in two-stage compression heat pump system that once throttles uses inverse circulating heat pump Defrosting is heated from frost layer inside, and frost is easy to fall off from cooling surface, is obtained so the heat ratio theoretical value actually to defrost is small It is more.Meanwhile frost layer is melted from inside to outside, does not have vapor to escape to outside outdoor heat exchanger at defrosting initial stage.Only when frost melts After falling off, the heat on ribbed pipe is just to external radiation, but the stage of defrosting at this time also tends to terminate, therefore the heat exchange amount with ambient enviroment Few, defrosting efficiency is relatively high.
4, among the utility model second throttle not exclusively cooling two-stage compression heat pump system Winter heat supply when, when there is low pressure Grade unit in outdoor heat exchanger defrosting when, defrosting low-pressure stage unit low temperature outdoor heat exchanger defrosting origin of heat be in press through heat Gas, i.e. defrosting low-pressure stage unit mesolow grade compressor are directly sucked from refrigeration low-pressure stage unit low-pressure stage compressor air-discharging end The high-pressure working medium temperature of the higher middle pressure steam of the degree of superheat, defrosting low-pressure stage unit low-pressure stage compressor discharge is higher, into removing The Temperature of Working of white low-pressure stage unit outdoor heat exchanger is higher, and defrosting effect is more preferable, and defrosting speed is faster.
5, the utility model once throttle two-stage compression heat pump system in winter heat supply when can according to specific operating condition, run Two-stage Compression heating circulation is recycled with single stage compress heating, again can be by adjusting first when running Two-stage Compression heating circulation The aperture of throttle valve realizes that the intermediate completely cooling Two-stage Compression heating circulation of primary throttling and primary throttling are intermediate not exclusively cooling Two-stage Compression heating circulation.System is simple, and switching is flexibly, applied widely.
Detailed description of the invention
Fig. 1 show the utility model and once throttles the structural schematic diagram of two-stage compression heat pump system;
Fig. 2 show the interface diagram of economizer.
Specific embodiment
The utility model is described in detail below in conjunction with the drawings and specific embodiments.
The utility model once throttle two-stage compression heat pump system structural schematic diagram as shown in Figure 1, include hiigh pressure stage pressure Contracting unit, indoor heat exchanger 5, first throttle valve 4-1, the second two-way valve 8-2, third two-way valve 8-3, economizer 3 and multiple low It arbitrarily downgrades unit.In the present embodiment, the high pressure stage compressor group includes one or more high pressure stage compressor, when using more height Arbitrarily downgrade compressor when, air-breathing of the air-breathing interface parallel connection of every high pressure stage compressor as the high pressure stage compressor group End, exhaust end of the exhaust port parallel connection of every high pressure stage compressor as the high pressure stage compressor group.Each low pressure Grade unit includes low-pressure stage compressor 1-1, four-way reversing valve 2, second throttle 4-2, outdoor heat exchanger 6, the first two-way valve 8- 1, the first check valve 7-1, second one-way valve 7-2 and third check valve 7-3;The suction end of the low-pressure stage compressor 1-1 and institute State the 4th interface connection of four-way reversing valve 2, the of the exhaust end of the low-pressure stage compressor 1-1 and the four-way reversing valve 2 The connection of two interfaces, the third interface of the four-way reversing valve 2 respectively with the import of the first check valve 7-1 and described second single It is connected to the outlet of valve 7-2, the first interface of the four-way reversing valve 2 is through the outdoor heat exchanger 6 and the second throttle The first interface of 4-2 connects, the second interface of the second throttle 4-2 respectively with the outlet of the third check valve 7-3 and The first interface of the first two-way valve 8-1 connects;The inlet parallel of the third check valve 7-3 together and with the economy The first interface 3-1 connection of device 3, the second interface of the first two-way valve 8-1 are divided into two-way after being connected in parallel, all the way with institute State the 4th interface 3-4 connection of economizer 3, another way respectively with the second interface of the indoor heat exchanger 5 and the first segment Flow the first interface connection of valve 4-1;The outlet of the first check valve 7-1, the import of the second one-way valve 7-2 and described It is connected to the first interface of the second two-way valve 8-2 after the suction end of high pressure stage compressor group is in parallel respectively, described second liang The second interface of port valve 8-2 is connect with the second interface 3-2 of the economizer 3;The exhaust end of the high pressure stage compressor group with The first interface of the indoor heat exchanger 5 connects, the third of the second interface of the first throttle valve 4-1 and the economizer 3 Interface 3-3 connection;The both ends of the third two-way valve 8-3 are connected in parallel in suction end and the exhaust of the high pressure stage compressor group End.Become by the interface of the first two-way valve 8-1, the opening and closing of the second two-way valve 8-2 and third two-way valve 8-3 and four-way reversing valve 2 It changes and realizes that heating circulation under the conditions of winter outdoor environment temperature is extremely low, winter once throttle Two-stage Compression heating/defrosting circulation, winter Season is without defrosting function single stage compress heating circulation/and summer single stage compress refrigeration cycle.Carrying out practically process is as follows:
In winter when heat supply, the heat pump system of the utility model is with the Two-stage Compression heating circular flow that once throttles.Wherein The low-pressure stage unit can be used for heating circulation or defrosting circulation, low-pressure stage system of the work in Two-stage Compression when for heating circulation In system, i.e., the outdoor heat exchanger in the low-pressure stage unit absorbs heat from outdoor environment, is defined as heating low-pressure stage unit.For Work is in the hiigh pressure stage system of Two-stage Compression when defrosting circulation, i.e., the outdoor heat exchanger in the low-pressure stage unit defrosts, definition For the low-pressure stage unit that defrosts.In summer cooling, the heat pump system of the utility model is run with single stage compress refrigeration cycle, wherein The low-pressure stage unit is used for refrigeration cycle, i.e. outdoor heat exchanger in low-pressure stage unit distributes heat to outdoor environment, defines For the low-pressure stage unit that freezes.
In winter when heat supply, the heat pump system of the utility model is with the Two-stage Compression heating circular flow that once throttles.When low When outdoor heat exchanger in unit of arbitrarily downgrading all does not need defrosting, all low-pressure stage units are for heating circulation, i.e., all low-pressure stage lists Member is heating low-pressure stage unit.The first two-way valve 8-1 is closed, and the second two-way valve 8-2 is opened, the third two-way valve 8-3 is closed.The first interface of four-way reversing valve 2 described in heating low-pressure stage unit connect with the 4th interface, second interface and the The connection of three interfaces.Primary throttling Two-stage Compression heating circulation thermal procession is as follows: refrigeration low-pressure stage unit mesolow grade compressor 1-1 sucks low-pressure steam through the four-way reversing valve 2 from the outdoor heat exchanger 6, and low-pressure steam is through the four-way reversing valve 2 And the first middle pressure working medium that is flowed out through the second two-way valve 8-2 of check valve 7-1 and second interface 3-2 from the economizer 3 Mixing;Mixed middle pressure working medium is sucked by the high pressure stage compressor group;Steam is through the high pressure stage compressor group mesohigh Grade compressor 1-2 compression is boosted to be discharged into the indoor heat exchanger 5 after becoming high pressure superheated vapor and be condensed, to indoor heat of transfer Amount generates heating phenomenon.The liquid come out from the indoor heat exchanger 5 is divided into two parts, and a part is through the first throttle valve 4-1 reducing pressure by regulating flow enters the economizer 3 by the third interface 3-3 of the economizer 3 and evaporates, and another part highly pressurised liquid is by institute The 4th interface 3-4 for stating economizer 3 is subcooled into the economizer 3, the quilt come out from the first interface 3-1 of the economizer 3 The liquid being subcooled becomes described in the entrance of low pressure damp steam through the third check valve 7-3 and second throttle 4-2 reducing pressure by regulating flow It is evaporated in outdoor heat exchanger 6, absorbs the heat of outdoor environment, described in the low-pressure steam warp come out from the outdoor heat exchanger 6 Four-way reversing valve 2 returns to the low-pressure stage compressor 1-1 suction end, completes primary throttling Two-stage Compression heating circulation.
When there is the outdoor heat exchanger in low-pressure stage unit to need to defrost, corresponding low-pressure stage unit is defrosting low-pressure stage list Member, remaining low-pressure stage unit are heating low-pressure stage unit.The second two-way valve 8-2 is closed, and the third two-way valve 8-3 is closed It closes.2 first interface of the four-way reversing valve in defrosting low-pressure stage unit connect with second interface, third interface and the 4th interface Connection, the first two-way valve 8-1 are opened.2 first interface of the four-way reversing valve in heating low-pressure stage unit connects with the 4th Mouth connection, second interface and third interface connect, and the first two-way valve 8-1 is closed.In above-mentioned primary throttling Two-stage Compression system On the basis of thermal cycle thermal procession, the defrosting thermal procession for the outdoor heat exchanger 6 described in low-pressure stage unit that defrosts is as follows: defrosting is low Arbitrarily downgrade the 1-1 of low-pressure stage compressor described in unit through the four-way reversing valve 2 and second one-way valve 7-2 from heating low-pressure stage unit The exhaust end of the low-pressure stage compressor 1-1 sucks the biggish middle pressure steam of the degree of superheat, and steam is through the low-pressure stage compressor 1-1 Become high pressure superheated vapor and be discharged into the low temperature outdoor heat exchanger 6 to condense after compression boosting, heats the outdoor heat exchanger 6, the defrosting phenomenon of the outdoor heat exchanger 6 is generated, the highly pressurised liquid working medium being condensed into throttles through the second throttle 4-2 Decompression becomes middle pressure damp steam, and damp steam enters the warp through the 4th interface 3-4 of the first two-way valve 8-1 and economizer 3 Help device 3, completes to heat circulation using the primary throttling Two-stage Compression of the high temperature hot gas defrosting of low-pressure stage compressor discharge.It is low when having When outdoor heat exchanger 6 described in unit of arbitrarily downgrading needs to defrost, to increase defrosting efficiency, the high pressure stage compressor 1-2 can be complete Portion is shut down, and the middle pressure working medium of greater flow is made to flow to defrosting low-pressure stage unit, realizes that multiple outdoor heat exchangers 6 remove simultaneously Frost, the high pressure stage compressor 1-2 can partially be shut down, and realized the multiple defrosting of outdoor heat exchanger 6 wheel shelves defrostings, guaranteed the room Interior heat exchanger 5 continues heat supply.Outdoor heat exchanger 6 described in one defrosting low-pressure stage unit is immediately converted as heating after defrosting Low-pressure stage unit is that outdoor heat exchanger 6 described in other low-pressure stage units defrosts.
In winter when heat supply, the heat pump system of the utility model is to heat circular flow, institute without defrosting function single stage compress Have low-pressure stage unit for heat circulation.The high pressure stage compressor 1-2 is shut down, and the second two-way valve 8-2 is closed, and described the Three two-way valve 8-3 open, it is described refrigeration low-pressure stage unit in four-way reversing valve 2 first interface connect with the 4th interface, second Interface is connect with third interface, and the first two-way valve 8-1 is closed.Heat low-pressure stage compressor 1-1 described in low-pressure stage unit Low-pressure steam is sucked from the outdoor heat exchanger 6 through the four-way reversing valve 2, low-pressure steam is compressed through the refrigeration low-pressure stage Machine 1-1 compression boosting becomes high pressure steam and is discharged into through the four-way reversing valve 2, the first check valve 7-1 and third two-way valve 8-3 It is condensed in the indoor heat exchanger 5, to indoor heat transfer, generates heating phenomenon;The high pressure come out from the indoor heat exchanger 5 Fourth interface 3-4 of the liquid through the economizer 3, the economizer 3 first interface 3-1 and third check valve 7-3 enter institute Stating second throttle 4-2 reducing pressure by regulating flow becomes low pressure damp steam into the outdoor heat exchanger 6 evaporation, absorbs outdoor environment heat Amount;It returns to from the low-pressure steam come out in outdoor heat exchanger 6 through the four-way reversing valve 2 described low in heating low-pressure stage unit It arbitrarily downgrades the suction end of compressor 1-1, completes without defrosting function single stage compress heating circulation.
In summer cooling, the heat pump system of the utility model is with the operation of single stage compress refrigeration cycle, all low-pressure stage lists Member is used for refrigeration cycle.The high pressure stage compressor 1-2 is shut down, and the second two-way valve 8-2 is closed, the third two-way valve 8- 3 open, it is described refrigeration low-pressure stage unit in four-way reversing valve 2 first interface connect with second interface, third interface and the 4th Interface connection, the first two-way valve 8-1 are opened.The low-pressure stage compressor 1-1 to freeze in low-pressure stage unit is through described the Three two-way valve 8-3, second one-way valve 7-2, four-way reversing valve 2 suck low-pressure steam from the indoor heat exchanger 5, and steam is through institute Stating refrigeration low-pressure stage compressor 1-1 compression boosting becomes high pressure steam and is discharged into the outdoor heat exchange through the four-way reversing valve 2 It is condensed in device 6, to outdoor heat transfer;The highly pressurised liquid come out from the outdoor heat exchanger 6 is saved through the second throttle 4-2 Stream decompression becomes low pressure damp steam and evaporates into the indoor heat exchanger 5, absorbs indoor environment heat, generates refrigeration phenomenon;From The low-pressure steam come out in indoor heat exchanger 5 is returned to through the third two-way valve 8-3, second one-way valve 7-2, four-way reversing valve 2 The suction end of the 1-1 of low-pressure stage compressor described in refrigeration unit completes single stage compress refrigeration cycle.
Heat when the heat pump system Winter heat supply of the utility model due to defrosting for defrosting low-pressure stage unit outdoor heat exchanger 6 For amount from heating low-pressure stage unit outdoor heat exchanger 6, low-pressure stage unit number is multiple.High pressure stage compressor in hiigh pressure stage unit Quantity is unlimited.During defrosting, whether high pressure stage compressor is shut down or depend on just arbitrarily downgrading head proportion, tool are shut down in part Body operating condition, defrosting quality etc., when defrosting, operation proportion type of just arbitrarily downgrading is more.
The low-pressure stage compressor and high pressure stage compressor can be selected as screw compressor, rotor compressor, screw rod pressure Any one of contracting machine and piston compressor.
The economizer is plate heat exchanger, double pipe heat exchanger or shell and tube exchanger.
The first throttle valve and second throttle are electric expansion valve, heating power expansion valve, capillary or orifice throttle dress It sets.
The above is only the preferred embodiment of the utility model, it is noted that for the general of the art For logical technical staff, without departing from the principle of this utility model, several improvements and modifications can also be made, these change It also should be regarded as the protection scope of the utility model into retouching.

Claims (2)

1. a kind of primary throttling two-stage compression heat pump system, which is characterized in that including high pressure stage compressor group, indoor heat exchanger, First throttle valve, the second two-way valve, third two-way valve, economizer and multiple low-pressure stage units;Each low-pressure stage unit packet Include low-pressure stage compressor, four-way reversing valve, second throttle, outdoor heat exchanger, the first two-way valve, the first check valve, the second list To valve and third check valve;The suction end of the low-pressure stage compressor is connect with the 4th interface of the four-way reversing valve, described The exhaust end of low-pressure stage compressor is connect with the second interface of the four-way reversing valve, the third interface point of the four-way reversing valve It is not connect with the import of first check valve and the outlet of the second one-way valve, the first interface warp of the four-way reversing valve The outdoor heat exchanger is connect with the first interface of the second throttle, the second interface of the second throttle respectively with institute The outlet for stating third check valve is connected with the first interface of first two-way valve;The inlet parallel of the third check valve is one It rising and is connect with the first interface of the economizer, the second interface of first two-way valve is divided into two-way after being connected in parallel, Connect all the way with the 4th interface of the economizer, another way respectively with the second interface of the indoor heat exchanger and described first The first interface of throttle valve connects;The outlet of first check valve, the import of the second one-way valve and the hiigh pressure stage It is connected to the first interface of second two-way valve after the suction end of compressor set is in parallel respectively, the second of second two-way valve Interface is connect with the second interface of the economizer;The of the exhaust end of the high pressure stage compressor group and the indoor heat exchanger The connection of one interface, the second interface of the first throttle valve are connect with the third interface of the economizer;The third two-way valve Both ends be connected in parallel in the suction end and exhaust end of the high pressure stage compressor group;Pass through the first two-way valve, the second two-way valve The interface transformation of opening and closing and four-way reversing valve with third two-way valve realizes that the winter Two-stage Compression heating/defrosting that once throttles follows Ring, winter are without defrosting function single stage compress heating circulation and summer single stage compress refrigeration cycle.
2. primary throttling two-stage compression heat pump system according to claim 1, which is characterized in that the high pressure stage compressor Group includes one or more high pressure stage compressor, when using more high pressure stage compressors, every high pressure stage compressor The exhaust port of suction end of the air-breathing interface parallel connection as the high pressure stage compressor group, every high pressure stage compressor is in parallel Exhaust end as the high pressure stage compressor group.
CN201821150651.9U 2018-07-20 2018-07-20 Primary throttling two-stage compression heat pump system Expired - Fee Related CN208735965U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201821150651.9U CN208735965U (en) 2018-07-20 2018-07-20 Primary throttling two-stage compression heat pump system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201821150651.9U CN208735965U (en) 2018-07-20 2018-07-20 Primary throttling two-stage compression heat pump system

Publications (1)

Publication Number Publication Date
CN208735965U true CN208735965U (en) 2019-04-12

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ID=66027743

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Application Number Title Priority Date Filing Date
CN201821150651.9U Expired - Fee Related CN208735965U (en) 2018-07-20 2018-07-20 Primary throttling two-stage compression heat pump system

Country Status (1)

Country Link
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