CN108759158A - A kind of completely cooling two-stage compression heat pump system in second throttle centre - Google Patents
A kind of completely cooling two-stage compression heat pump system in second throttle centre Download PDFInfo
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- CN108759158A CN108759158A CN201810800282.1A CN201810800282A CN108759158A CN 108759158 A CN108759158 A CN 108759158A CN 201810800282 A CN201810800282 A CN 201810800282A CN 108759158 A CN108759158 A CN 108759158A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Abstract
The invention discloses completely cooling two-stage compression heat pump systems among a kind of second throttle, it is desirable to provide using the system with low-pressure stage compressor Defrost when a kind of heat supply in winter.Including high pressure stage compressor group, indoor heat exchanger, first throttle valve, the first two-way valve, the second two-way valve, the second four-way reversing valve, intercooler and multiple low-pressure stage units；Each low-pressure stage unit includes low-pressure stage compressor, the first four-way reversing valve, second throttle, outdoor heat exchanger, the first check valve, the second check valve, third check valve and the 4th check valve.Completely cooling heating/defrosting cycle and summer single stage compress refrigeration cycle among the second throttle in winter are realized by the switching of the connecting interface of the first four-way reversing valve and the second four-way reversing valve and the keying of the first two-way valve and the second two-way valve.The system structure is simple, and defrosting is efficient, and temperature fluctuation is small.
Description
Technical field
The present invention relates to heat pump air conditioner technical fields, and more specifically, it relates to completely cooling among a kind of second throttle
Two-stage compression heat pump system.
Background technology
Air source heat pump be one kind based on low-temperature heat source, produced higher than environment temperature using the low grade heat energy in air
The hot water of degree or the energy saver of air.The operation of air source heat pump is affected by the epidemic disaster of ambient enviroment, on cold ground
The heating efficiency of runtime system is low under area or extreme weather conditions restricts its promoted extension and development speed with frosting problem.
Existing heat pump system mainly uses single machine compression cycle and two-stage compression cycle.Single machine compression heat pump system is usual
Using reverse cycle defrosting method, by changing the connection type of four-way reversing valve, the working medium of the of short duration entire heat pump system of change
Flow direction, and then change the shift direction of heat, so that evaporator is changed into condenser, reaches defrosting effect for outdoor unit heating
Fruit.But for two-stage compression cycle, since compressor of just arbitrarily downgrading is complicated with intercooler, connection type is complicated,
It is different to import and export more and function, inlet and outlet can not be used inversely, be realized in system pipeline connection difficult.Meanwhile evaporator table
The temperature difference between face temperature and environment temperature is larger, and defrosting time is long, and the temperature fluctuation of indoor environment is larger, and indoor environment is relaxed
It is moderately low.Therefore, to make two-stage compression heat pump system keep high-efficiency operation, it is necessary to be carried out orderly, efficiently remove to outdoor unit
Frost.
Invention content
In view of the technical drawbacks of the prior art, it is an object of the present invention to provide band is used when a kind of heat supply in winter
The Two-stage Compression heating cycle of low-pressure stage compressor Defrost, using two partial nodes of single stage compress refrigeration cycle when summer cooling
The intermediate completely cooling two-stage compression heat pump system of stream.
The technical solution adopted to achieve the purpose of the present invention is：
A kind of two-stage compression heat pump system that second throttle centre is completely cooling, including high pressure stage compressor group, interior are changed
Hot device, first throttle valve, the first two-way valve, the second two-way valve, the second four-way reversing valve, intercooler and multiple low-pressure stage lists
Member；Each low-pressure stage unit includes low-pressure stage compressor, the first four-way reversing valve, second throttle, outdoor heat exchanger, the
One check valve, the second check valve, third check valve and the 4th check valve；The suction end of the low-pressure stage compressor and described first
4th interface of four-way reversing valve connects, and the exhaust end of the low-pressure stage compressor connects with the second of first four-way reversing valve
Mouthful connection, the third interface of first four-way reversing valve respectively with the import of first check valve and second check valve
Outlet connection, the first interface of first four-way reversing valve connects through the outdoor heat exchanger and the second throttle first
The second interface of mouth connection, the second throttle connects with the outlet of the third check valve and the import of the 4th check valve respectively
It connects；The inlet parallel of the third check valve is connect with the liquid outlet of the intercooler together, the 4th check valve
Outlet be connected in parallel after connect with the inlet of the intercooler by first two-way valve, described first is single
Outlet to valve is connect after being connected in parallel with the second interface of second four-way reversing valve, the import of second check valve
And and the high pressure stage compressor group suction end be connected in parallel after connect with the third interface of second four-way reversing valve,
The first interface of second four-way reversing valve is connect with the intercooler air inlet, and the of second four-way reversing valve
Four interfaces are connect with the gas outlet of the intercooler；The exhaust end of the high pressure stage compressor group is through the indoor heat exchange
Device, first throttle valve and the first two-way valve are connect with the inlet of the intercooler；Second two-way valve both ends are simultaneously
Connection is connected to the suction end and exhaust end of the high pressure stage compressor group；It is changed by first four-way reversing valve and the second four-way
The keying of switching and the first two-way valve and the second two-way valve to the connecting interface of valve is realized complete among the second throttle in winter
Complete cooling Two-stage Compression heating/defrosting cycle 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, the 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 beneficial effects of the invention are as follows：
1, heat pump system of the invention is by the switching of valve, using band low-pressure stage compressor Defrost when heat supply in winter
Two-stage Compression heating cycle, single stage compress refrigeration cycle, each low-pressure stage unit wheel shelves defrosting are used when summer cooling.Except
Under white pattern, realizes that the low-pressure stage compressor of defrosting function is converted into high pressure stage compressor operation, realize the low pressure of defrosting function
Cryogenic compressor in grade unit is absorbed presses through heat steam in the low-pressure stage compressor for realizing heat-production functions, realizes low pressure
Cycle when the inverse cycle defrosting of grade unit, cycle when defrosting and heating is two-stage compression cycle, and then forms one and move
State system, temperature fluctuation is small, and defrosting efficiency is high, energy saving.Meanwhile compressor can stable operation, improve making for system
Use the service life.
2, the outdoor heat exchanger defrosting among second throttle of the present invention in completely cooling two-stage compression heat pump system is using inverse
Circulating heat pump defrosting is heated from frost layer inside, and frost is easy to fall off from cooling surface, so the heat ratio actually to defrost is theoretical
It is worth much smaller.Meanwhile frost layer is melted from inside to outside, does not have vapor to be escaped to outside outdoor heat exchanger at defrosting initial stage.Only when
After frost thawing falls off, the heat on ribbed pipe is just to external radiation, but the stage of defrosting at this time also tends to terminate, therefore is enclosed with Ku Nei and surrounding
The heat exchange amount of protection structure is few, and defrosting efficiency is relatively high.
3, the outdoor heat exchanger defrosting among second throttle of the present invention in completely cooling two-stage compression heat pump system is using inverse
Circulating heat pump defrosting, outdoor heat exchanger can take turns shelves defrosting, when realizing outdoor heat exchange defrosting, the lasting confession of indoor heat exchanger
Heat, when increasing outdoor heat exchange defrosting, the comfort of indoor environment temperature.
4, heat supply is followed completely cooling two-stage compression heat pump system using Two-stage Compression in winter among second throttle of the present invention
Ring can take heat under extremely low outdoor environment temperature, and high pressure stage compressor number is multiple, and low-pressure stage unit number is multiple,
Variable-flow cycle of just arbitrarily downgrading can be realized according to different working condition requirement, different heating load demands, match height and arbitrarily downgrade
Optimum capacity ratio between grade, heating efficiency is high, and in summer cooling, high pressure stage compressor is shut down, all low-pressure stage compressor parallels
Operation, realizes the electrodeless flow-rate adjustment of refrigeration cycle, high cooling efficiency.
5, among second throttle of the present invention completely cooling two-stage compression heat pump system in winter heat supply when low-pressure stage compression
Machine is converted to high pressure stage compressor work in the thermal procession of corresponding low voltage unit defrosting, is conducive to compressor profit of just arbitrarily downgrading
Lubricating oil oil return is uniform, and compressor abrasion degree of just arbitrarily downgrading is uniform, extends the service life of entire heat pump system.
6, among second throttle of the present invention completely cooling two-stage compression heat pump system Winter heat supply when, when there is low-pressure stage unit
When middle outdoor heat exchanger defrosting, the origin of heat that low-pressure stage unit low temperature outdoor heat exchanger defrosts that defrosts presses through hot gas in being,
I.e. defrosting low-pressure stage unit mesolow grade compressor is directly from refrigeration low-pressure stage unit low-pressure stage compressor air-discharging end sucking overheat
Higher middle pressure steam is spent, the high-pressure working medium temperature higher through the low-pressure stage unit low-pressure stage compressor discharge that defrosts, into defrosting
The Temperature of Working higher of low-pressure stage unit outdoor heat exchanger, defrosting effect is more preferable, and defrosting speed is faster.
Description of the drawings
Fig. 1 show the schematic diagram of completely cooling two-stage compression heat pump system among second throttle of the present invention；
Fig. 2 show intercooler interface diagram.
Specific implementation mode
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The schematic diagram of completely cooling two-stage compression heat pump system is as shown in Figure 1, include high pressure among second throttle of the present invention
Grade compressor set, indoor heat exchanger 5, first throttle valve 4-1, the first two-way valve 8-1, the second two-way valve 8-2, the commutation of the second four-way
Valve 2-2, intercooler 3 and multiple low-pressure stage units.In the present embodiment, the high pressure stage compressor group includes one or more
High pressure stage compressor 1-2, when using more high pressure stage compressors, the air-breathing interface of every high pressure stage compressor 1-2 is simultaneously
Join the suction end as the high pressure stage compressor group, the exhaust port parallel connection of every high pressure stage compressor 1-2 is as institute
State the exhaust end of high pressure stage compressor group.Each low-pressure stage unit includes low-pressure stage compressor 1-1, the first four-way reversing valve
2-1, second throttle 4-2, outdoor heat exchanger 6, the first check valve 7-1, the second check valve 7-2, third check valve 7-3 and the 4th
Check valve 7-4；The suction end of the low-pressure stage compressor 1-1 is connect with the 4th interface of the first four-way reversing valve 2-1, institute
The exhaust end for stating low-pressure stage compressor 1-1 is connect with the second interface of the first four-way reversing valve 2-1, and first four-way changes
It is connect respectively with the import of the first check valve 7-1 and the outlet of the second check valve 7-2 to the third interface of valve 2-1,
The first interface of the first four-way reversing valve 2-1 connects through the outdoor heat exchanger 6 and the second throttle 4-2 first interfaces
Connect, the second interface of the second throttle 4-2 respectively with the outlet of the third check valve 7-3 and the 4th check valve 7-4
Import connects；The inlet parallel of the third check valve 7-3 is connect with the liquid outlet 3-4 of the intercooler 3 together, institute
State the 4th check valve 7-4 outlet be connected in parallel after by the first two-way valve 8-1 and the intercooler into
The 3-3 connections of liquid mouth, the outlet of the first check valve 7-1 be connected in parallel after with the second four-way reversing valve 2-2 second
Interface connects, the import of the second check valve 7-2 and and the high pressure stage compressor group suction end be connected in parallel after with
The third interface of the second four-way reversing valve 2-2 connects, the first interface of the second four-way reversing valve 2-2 and the centre
3 air inlet 3-1 connections of cooler, the gas outlet of the 4th interface and the intercooler 3 of the second four-way reversing valve 2-2
3-2 connections；The exhaust end of the high pressure stage compressor group is through the indoor heat exchanger 5, first throttle valve 4-1 and the first two-way valve
8-1's connect with the inlet 3-3 of the intercooler 3.The both ends second two-way valve 8-2 are connected in parallel in the high pressure
The suction end and exhaust end of grade compressor set.Pass through the connection of the first four-way reversing valve 2-1 and the second four-way reversing valve 2-2
The switching of interface and the keying of the first two-way valve 8-1 and the second two-way valve 8-2 are realized completely cold among the second throttle in winter
But heating/defrosting cycle and summer single stage compress refrigeration cycle.Carrying out practically process is as follows：
In winter when heat supply, heat pump system of the invention is with completely cooling heating circular flow among second throttle.Wherein
The low-pressure stage unit can be used for heating cycle or defrosting cycle, and the low-pressure stage system of Two-stage Compression is operated in when for heating cycle
In system, i.e., the outdoor heat exchanger 6 in the low-pressure stage unit absorbs heat from outdoor environment, is defined as heating low-pressure stage unit.With
When defrosting recycles, being operated in the hiigh pressure stage system of Two-stage Compression, i.e., the outdoor heat exchanger 6 in the low-pressure stage unit defrosts,
It is defined as defrosting low-pressure stage unit.In summer cooling, heat pump system of the invention is run with single stage compress refrigeration cycle, wherein
The low-pressure stage unit is used for refrigeration cycle, i.e. outdoor heat exchanger 6 in low-pressure stage unit distributes heat to outdoor environment, defines
For the low-pressure stage unit that freezes.
In winter when heat supply, heat pump system of the invention is with completely cooling heating circular flow among second throttle.When low
When outdoor heat exchanger in unit of arbitrarily downgrading need not all defrost, all low-pressure stage units are recycled for heating, i.e., all low-pressure stage lists
Member is heating low-pressure stage unit.The first two-way valve 8-1 is opened, the second two-way valve 8-2 is closed, the second four-way reversing valve
The first interface of 2-2 is connect with second interface, third interface is connect with the 4th interface, is heated the one or four described in low-pressure stage unit
The first interface of logical reversal valve 2-1 is connect with the 4th interface, second interface and third interface connect.It is completely cold among second throttle
But the thermal procession of Two-stage Compression heating cycle is as follows：The low-pressure stage compressor 1-1 in low-pressure stage unit is heated through the described 1st
Logical reversal valve 2-1 sucks low-pressure steam from the outdoor heat exchanger 6, and steam is compressed through the low-pressure stage compressor 1-1 to boost
After become in press through heat steam, after through the first four-way reversing valve 2-1, the first check valve 7-1, the second four-way reversing valve 2-
2 and intercooler 3 air inlet 3-1 be discharged into the intercooler 3 cooling.The suction end of the high pressure stage compressor group
Through the second four-way reversing valve 2-2 saturated vapor, middle pressure saturated vapor are pressed from the gas outlet 3-2 of the intercooler 3 suckings
It is discharged into the room after the high pressure stage compressor 1-2 compression boostings in the high pressure stage compressor group become high pressure superheated vapor
It is condensed in interior heat exchanger 5, to indoor heat transfer, generates heating phenomenon.Condensed highly pressurised liquid is through the first throttle valve
4-1 reducing pressure by regulating flow become middle inlet 3-3 of the pressure damp steam through the first two-way valve 8-1, intercooler 3 enter it is described in
Between cooler 3.Middle a part of evaporation endothermic of press liquid working medium in the intercooler 3, the cooling intercooler 3 into
Gas port presses through heat steam in coming in.The middle pressure saturated liquid flowed out from 3 liquid outlet 3-4 of intercooler is unidirectional through the third
Valve 7-3, second throttle 4-2 reducing pressure by regulating flow become low pressure damp steam into evaporating in the outdoor heat exchanger 6, absorption chamber outer shroud
The heat in border, the low-pressure steam from the outdoor heat exchanger 6 out return to the low pressure through the first four-way reversing valve 2-1
Grade compressor 1-1 suction ends complete completely cooling Two-stage Compression heating cycle among second throttle.
When there is the outdoor heat exchanger 6 in low-pressure stage unit to need defrosting, corresponding low-pressure stage unit is defrosting low-pressure stage
Unit, remaining low-pressure stage unit are heating low-pressure stage unit.The first interface of the second four-way reversing valve 2-2 connects with the 4th
Mouthful connection, second interface and third interface connect, defrost the first four-way reversing valve 2-1 first interfaces described in low-pressure stage unit with
Second interface connection, third interface are connect with the 4th interface, heat the company of the first four-way reversing valve 2-1 described in low-pressure stage unit
Connection interface is constant.First two-way valve 8-1 is opened, and the second two-way valve 8-2 is closed.The completely cooling twin-stage among above-mentioned second throttle
Compression pyrogenic recycles on heating power process basis, and the heating cycle of heating low-pressure stage unit is constant, defrosts described in low-pressure stage unit
The defrosting thermal procession of outdoor heat exchanger 6 is as follows：Low-pressure stage compressor 1-1 described in low-pressure stage unit defrost through first four-way
Reversal valve 2-1, the second check valve 7-2 and the second four-way reversing valve 2-2 are from the low-pressure stage compressor 1-1's for heating low-pressure stage unit
Press through heat steam in exhaust end sucking, in press through heat steam and become height after low-pressure stage compressor 1-1 compression boostings and press through
Heat steam is discharged into the low temperature outdoor heat exchanger 6 and condenses, and heats the low temperature outdoor heat exchanger 6, generates the low temperature chamber
The defrosting phenomenon of external heat exchanger 6, the highly pressurised liquid working medium being condensed into become middle pressure through the second throttle 4-2 reducing pressure by regulating flow
Damp steam, inlet 3-3 of the middle pressure damp steam through the 4th check valve 7-4, the first two-way valve 8-1, intercooler 3 enter
The intercooler 3 is completed completely cooling among the second throttle using the high temperature hot gas defrosting of low-pressure stage compressor discharge
Two-stage Compression heating cycle.
In summer cooling, heat pump system of the invention is run with single stage compress refrigeration cycle, and high pressure stage compressor is shut down,
All low-pressure stage units are used for refrigeration cycle.The first throttle valve 4-1 aperture regulations to maximum, the first two-way valve 8-1
It closes, the second two-way valve 8-2 is opened, and the second interface of the second four-way reversing valve 2-2 connect with third interface, first interface
Connect with the 4th interface, it is described refrigeration low-pressure stage unit in the first four-way reversing valve 2-1 first interface connect with second interface,
Third interface is connect with the 4th interface.Low-pressure stage compressor 1-1 described in low-pressure stage unit freeze through the second two-way valve 8-
2, the second check valve 7-2, the first four-way reversing valve 2-1 suck low-pressure steam from the indoor heat exchanger 5, and low-pressure steam is through institute
It states refrigeration low-pressure stage compressor 1-1 compression boosting and becomes high pressure steam and be discharged into the room through the first four-way reversing valve 2-1
It is condensed in external heat exchanger 6, to outdoor heat transfer；The highly pressurised liquid come out from the outdoor heat exchanger 6 throttles through described second
Valve 4-2 reducing pressure by regulating flow becomes low pressure damp steam, and low pressure damp steam enters institute through the 4th check valve 7-4, first throttle valve 4-1 successively
The evaporation of indoor heat exchanger 5 is stated, indoor environment heat is absorbed, generates refrigeration phenomenon.Low-pressure steam from indoor heat exchanger 5 out
The low pressure in refrigeration low-pressure stage unit is returned to through the second two-way valve 8-2, the second check valve 7-2, the first four-way reversing valve 2-1
The suction end of grade compressor 1-1, completes single stage compress refrigeration cycle.
The present invention heat pump system in winter heat supply when, due to for defrosting low-pressure stage unit outdoor heat exchanger 6 defrost heat
Amount is from heating low-pressure stage unit outdoor heat exchanger 6, so the low-pressure stage unit number is multiple, the high pressure stage compressor
Number is unlimited.When there is outdoor heat exchanger 6 described in low-pressure stage unit to need defrosting, to increase defrosting efficiency, the hiigh pressure stage pressure
Contracting machine 1-2 can all be shut down, and the middle pressure working medium of greater flow is made to flow to defrosting low-pressure stage unit, realize that multiple outdoors are changed
Hot device 6 defrosts simultaneously.The high pressure stage compressor 1-2 can also partly be shut down, and realize that multiple outdoor heat exchangers 6 take turns shelves defrosting,
Ensure that the indoor heat exchanger 5 continues heat supply.After the defrosting of outdoor heat exchanger 6 described in one defrosting low-pressure stage unit immediately
Heating low-pressure stage unit is converted to, is that outdoor heat exchanger 6 described in other low-pressure stage units defrosts, waits for all outdoor heat exchangers
6 defrostings are completed, and all low-pressure stage cell translations are heating low-pressure stage unit.
The low-pressure stage compressor and high pressure stage compressor are screw compressor, rotor compressor, helical-lobe compressor and work
Fill in any one of compressor.
The intercooler 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 check valve, four-way reversing valve are the prior art.Check valve, two-way valve, hand valve and three can be used in systems
Logical reversal valve replaces.
The above is only a preferred embodiment of the present invention, it is noted that for the common skill of the art
For art personnel, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (2)
1. completely cooling two-stage compression heat pump system among a kind of second throttle, which is characterized in that including high pressure stage compressor group,
Indoor heat exchanger, first throttle valve, the first two-way valve, the second two-way valve, the second four-way reversing valve, intercooler and multiple low
It arbitrarily downgrades unit；Each low-pressure stage unit includes that low-pressure stage compressor, the first four-way reversing valve, second throttle, outdoor are changed
Hot device, the first check valve, the second check valve, third check valve and the 4th check valve；The suction end of the low-pressure stage compressor with
4th interface of first four-way reversing valve connects, the exhaust end of the low-pressure stage compressor and first four-way reversing valve
Second interface connection, the third interface of first four-way reversing valve respectively with the import of first check valve and described the
The outlet of two check valves connects, and the first interface of first four-way reversing valve throttles through the outdoor heat exchanger and described second
Valve first interface connects, the second interface of the second throttle respectively with the outlet of the third check valve and the 4th check valve
Import connection；The inlet parallel of the third check valve is connect with the liquid outlet of the intercooler together, and described
The outlet of four check valves is connect by first two-way valve with the inlet of the intercooler after being connected in parallel, institute
State the first check valve outlet be connected in parallel after connect with the second interface of second four-way reversing valve, described second is unidirectional
The import of valve and and the high pressure stage compressor group suction end be connected in parallel after third with second four-way reversing valve
Interface connects, and the first interface of second four-way reversing valve is connect with the intercooler air inlet, second four-way
4th interface of reversal valve is connect with the gas outlet of the intercooler；Described in the exhaust end warp of the high pressure stage compressor group
Indoor heat exchanger, first throttle valve and the first two-way valve are connect with the inlet of the intercooler；Described second liang logical
Valve both ends are connected in parallel in the suction end and exhaust end of the high pressure stage compressor group；Pass through first four-way reversing valve and
Two partial nodes in winter are realized in the switching of the connecting interface of two four-way reversing valves and the keying of the first two-way valve and the second two-way valve
The intermediate completely cooling Two-stage Compression heating/defrosting cycle of stream and summer single stage compress refrigeration cycle.
2. completely cooling two-stage compression heat pump system among second throttle according to claim 1, which is characterized in that described
High pressure stage compressor group includes one or more high pressure stage compressor, when using more high pressure stage compressors, every height
It arbitrarily downgrades suction end of the air-breathing interface parallel connection as the high pressure stage compressor group of compressor, every high pressure stage compressor
Exhaust end of the exhaust port parallel connection as the high pressure stage compressor group.
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| CN201810800282.1A CN108759158B (en) | 2018-07-20 | 2018-07-20 | Secondary throttling middle complete cooling two-stage compression heat pump system |
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| CN201810800282.1A CN108759158B (en) | 2018-07-20 | 2018-07-20 | Secondary throttling middle complete cooling two-stage compression heat pump system |
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| CN108759158A true CN108759158A (en) | 2018-11-06 |
| CN108759158B CN108759158B (en) | 2023-10-13 |
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| KR101715863B1 (en) * | 2016-03-07 | 2017-03-14 | 우종걸 | Defrost system at low temperature device |
| CN108088110A (en) * | 2018-01-25 | 2018-05-29 | 天津商业大学 | Incomplete chiller-heat pump system among second throttle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6410066A (en) * | 1987-06-30 | 1989-01-13 | Toshiba Corp | Air conditioner |
| CN204593991U (en) * | 2015-03-10 | 2015-08-26 | 山东福德新能源设备有限公司 | A kind of hot pump in low temp superposition phase-change accumulation energy control defrosting system |
| CN105318454A (en) * | 2015-11-13 | 2016-02-10 | 清华大学 | Air source multi-connected type air conditioning heat pump system and operation method thereof |
| KR101715863B1 (en) * | 2016-03-07 | 2017-03-14 | 우종걸 | Defrost system at low temperature device |
| CN108088110A (en) * | 2018-01-25 | 2018-05-29 | 天津商业大学 | Incomplete chiller-heat pump system among second throttle |
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