CN208871901U - Two-stage compression heat pump system with incomplete cooling in the middle of secondary throttling - Google Patents
Two-stage compression heat pump system with incomplete cooling in the middle of secondary throttling Download PDFInfo
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- CN208871901U CN208871901U CN201821150568.1U CN201821150568U CN208871901U CN 208871901 U CN208871901 U CN 208871901U CN 201821150568 U CN201821150568 U CN 201821150568U CN 208871901 U CN208871901 U CN 208871901U
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- 230000006835 compression Effects 0.000 title claims abstract description 35
- 238000007906 compression Methods 0.000 title claims abstract description 35
- 238000001816 cooling Methods 0.000 title claims abstract description 32
- 238000010257 thawing Methods 0.000 claims abstract description 55
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 238000005057 refrigeration Methods 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims description 10
- 230000008676 import Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011555 saturated liquid Substances 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 230000014616 translation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
本实用新型公开了一种二次节流中间不完全冷却双级压缩热泵***，其旨在提供一种冬季供暖时采用带低压级压缩机热泵除霜的***。包括高压级压缩机组、室内换热器、第一节流阀、第一电磁阀、第二电磁阀、第三电磁阀、中间冷却器及多个低压级单元；每个低压级单元包括低压级压缩机、四通换向阀、第二节流阀、室外换热器、第一单向阀、第二单向阀、第三单向阀及第四单向阀；通过第一四通换向阀的接口切换及第一两通阀、第二两通阀和第三两通阀的启闭实现冬季二次节流中间不完全冷却制热/融霜循环，以及夏季的单级压缩制冷循环。除霜循环与制热循环均是双级压缩循环，温度波动小，除霜效率高，压缩机能够稳定运行，提高了***的使用寿命。
The utility model discloses a secondary throttling intermediate incomplete cooling two-stage compression heat pump system, which aims to provide a defrosting system using a heat pump with a low-pressure stage compressor for heating in winter. It includes a high pressure stage compressor unit, an indoor heat exchanger, a first throttle valve, a first solenoid valve, a second solenoid valve, a third solenoid valve, an intercooler and a plurality of low pressure stage units; each low pressure stage unit includes a low pressure stage Compressor, four-way reversing valve, second throttle valve, outdoor heat exchanger, first one-way valve, second one-way valve, third one-way valve and fourth one-way valve; through the first four-way switch The interface switching of the valve and the opening and closing of the first two-way valve, the second two-way valve and the third two-way valve realize the incomplete cooling and heating/defrosting cycle in the middle of the secondary throttling in winter, and the single-stage compression refrigeration in summer cycle. Both the defrosting cycle and the heating cycle are two-stage compression cycles, with small temperature fluctuations, high defrosting efficiency, stable operation of the compressor, and improved service life of the system.
Description
Technical field
The utility model relates to heat pump air conditioner technical field, more specifically, it relates to a kind of winters to use hot gas for room
Not exclusively cooling Two-stage Compression heating circulation among the second throttle of external heat exchanger defrosting in turn, summer is using single stage compress refrigeration
The heat pump system of circulation.
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.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 circulation 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, due to just arbitrarily downgrading compressor, structure 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.
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 two of single stage compress refrigeration cycle when summer cooling
Completely cooling two-stage compression heat pump system among secondary throttling.
It is for technical solution used by realization the purpose of this utility model:
A kind of not exclusively cooling two-stage compression heat pump system in second throttle centre, including high pressure stage compressor group, interior are changed
Hot device, first throttle valve, the first solenoid valve, second solenoid valve, third solenoid valve, intercooler 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, first unidirectional
Valve, second one-way valve, third check valve and the 4th check valve；The suction end and the four-way reversing valve of the low-pressure stage compressor
The connection of the 4th interface, the exhaust end of the low-pressure stage compressor connect with the second interface of the four-way reversing valve, described four
The third interface of logical reversal valve is connect with the import of first check valve and the outlet of the second one-way valve respectively, and described four
The first interface of logical reversal valve is connect through the outdoor heat exchanger with the first interface of the second throttle, second throttling
The second interface of valve is connect with the outlet of the third check valve and the import of the 4th check valve respectively；The third check valve
Inlet parallel is together rear to be connect with the liquid outlet of the intercooler, after the outlet of the 4th check valve is connected in parallel
Pass through connecting with the inlet of the intercooler for the second solenoid valve；The outlet of first check valve, described
After the suction end of the import of two check valves and the high pressure stage compressor group is connected in parallel, by first solenoid valve with
The gas outlet of the intercooler connects；The exhaust end of the high pressure stage compressor group is through the indoor heat exchanger, first segment
Stream valve, the second solenoid valve are connect with the inlet of the intercooler；The both ends of the third solenoid valve are connected in parallel
In the suction end and exhaust end of the high pressure stage compressor group；Pass through the switching of the interface of first four-way reversing valve and described the
Not exclusively cooling heating/defrosting among winter second throttle is realized in the opening and closing of one two-way valve, the second two-way valve and third two-way valve
Circulation and the single stage compress refrigeration cycle of summer.
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, using band low-pressure stage compressor heat when heat supply in winter
The Two-stage Compression of pump defrosting heats circulation, and single stage compress refrigeration cycle is used when summer cooling, and each low-pressure stage unit wheel shelves remove
Frost realizes that the low-pressure stage compressor of defrosting function is converted into high pressure stage compressor operation, realizes defrosting function in defrost mode
Low-pressure stage unit in cryogenic compressor absorb and press through heat steam in the low-pressure stage compressor for realizing heat-production functions, it is real
The inverse circulation defrosting of existing low-pressure stage unit, defrosting circulation is two-stage compression cycle with heating circulation, and then forms a dynamic
System, temperature fluctuation is small, and defrosting efficiency is high, energy saving.Meanwhile compressor can stable operation, improve the use of system
Service life.
2, the outdoor heat exchanger defrosting among the utility model second throttle in not exclusively cooling two-stage compression heat pump system
It using inverse circulating heat pump defrosting, is heated from frost layer inside, frost is easy to fall off from cooling surface, so the heat actually to defrost
It is more much smaller than theoretical value.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 after frost thawing falls off, the heat on ribbed pipe just to external radiation, but at this time the defrosting stage also tend to terminate, therefore with it is indoor and
The heat exchange amount of surrounding building enclosure is few, and defrosting efficiency is relatively high.
3, the outdoor heat exchanger defrosting among the utility model second throttle in not exclusively cooling two-stage compression heat pump system
Using inverse circulating heat pump defrosting, outdoor heat exchanger can take turns shelves defrosting, and when realizing outdoor heat exchange defrosting, indoor heat exchanger is held
Continuous heat supply, the comfort of indoor environment temperature when increasing outdoor heat exchange defrosting.
4, heat supply uses twin-stage to not exclusively cooling two-stage compression heat pump system in winter among the utility model second throttle
Compression circulation, can take heat, and high pressure stage compressor number is multiple, low-pressure stage unit number under extremely low outdoor environment temperature
It is multiple, it can realize variable-flow circulation of just arbitrarily downgrading according to different working condition requirement, different heating load demands, match height
Optimum capacity ratio between low-pressure stage grade, heating efficiency is high, and in summer cooling, high pressure stage compressor is shut down, all low-pressure stage compressions
Machine parallel running realizes that the electrodeless flow of refrigeration cycle is adjusted, high cooling efficiency.
5, among the utility model second throttle not exclusively cooling two-stage compression heat pump system in winter heat supply when low pressure
Grade compressor is converted to high pressure stage compressor work in the thermal procession of corresponding low voltage unit defrosting, is conducive to height and arbitrarily downgrades
Contracting machine lubricating 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 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.
Detailed description of the invention
Fig. 1 show the schematic diagram of two-stage compression heat pump system not exclusively cooling among the utility model second throttle；
Fig. 2 show intercooler interface diagram.
Specific embodiment
The utility model is described in detail below in conjunction with the drawings and specific embodiments.
Among the utility model second throttle two-stage compression heat pump system not exclusively cooling schematic diagram as shown in Figure 1,
Including high pressure stage compressor group, indoor heat exchanger 5, first throttle valve 4-1, the first solenoid valve 8-1, second solenoid valve 8-2, third
Solenoid valve 8-3, intercooler 3 and multiple low-pressure stage units.In the present embodiment, the high pressure stage compressor group include one or
More high pressure stage compressor 1-2, when using more high pressure stage compressors, the air-breathing of every high pressure stage compressor 1-2 is connect
The mouth suction end in parallel as the high pressure stage compressor group, the exhaust port parallel connection of every high pressure stage compressor 1-2 are made
For the exhaust end of the high pressure stage compressor group.Each low-pressure stage unit includes low-pressure stage compressor 1-1, four-way reversing valve
2, second throttle 4-2, outdoor heat exchanger 6, the first check valve 7-1, second one-way valve 7-2, third check valve 7-3 and the 4th are single
To valve 7-4；The suction end of the low-pressure stage compressor 1-1 is connect with the 4th interface of the four-way reversing valve 2, the low-pressure stage
The exhaust end of compressor 1-1 is connect with the second interface of the four-way reversing valve 2, the third interface point of the four-way reversing valve 2
It is not connect with the import of the first check valve 7-1 and the outlet of the second one-way valve 7-2, the of the four-way reversing valve 2
One interface is connect through the outdoor heat exchanger 6 with the first interface of the second throttle 4-2, the second throttle 4-2's
Second interface is connect with the outlet of the third check valve 7-3 and the import of the 4th check valve 7-4 respectively；The third check valve
The inlet parallel of 7-3 is together rear to be connect with the liquid outlet 3-3 of the intercooler 3, the outlet of the 4th check valve 7-4
Connecting with the inlet 3-2 of the intercooler by the second solenoid valve 8-2 after being connected in parallel；Described first is single
Outlet, the import of the second one-way valve 7-2 and the suction end of the high pressure stage compressor group to valve 7-1 are connected in parallel
Afterwards, it is connect by the first solenoid valve 8-1 with the gas outlet 3-1 of the intercooler 3；The high pressure stage compressor group
Exhaust end through the indoor heat exchanger 5, first throttle valve 4-1, the second solenoid valve 8-2 and the intercooler 3 into
The 3-2 connection of liquid mouth；The both ends of the third solenoid valve 8-3 are connected in parallel in suction end and the exhaust of the high pressure stage compressor group
End.Pass through the switching of the interface of first four-way reversing valve and first two-way valve, the second two-way valve and third two-way valve
Not exclusively cooling heating/defrosting circulation and the single stage compress refrigeration cycle of summer among winter second throttle are realized in opening and closing.Tool
Running body process is as follows:
In winter when heat supply, the heat pump system of the utility model is with heating circulation fortune not exclusively cooling among second throttle
Row.Wherein the low-pressure stage unit can be used for heating circulation or defrosting circulation, and work is in Two-stage Compression when for heating circulation
In low-pressure stage 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.Outdoor heat exchanger of the work in the hiigh pressure stage system of Two-stage Compression, i.e., in low-pressure stage unit when being recycled for defrosting
Defrosting is defined as defrosting low-pressure stage unit.In summer cooling, the heat pump system of the utility model is with single stage compress refrigeration cycle
Operation, wherein the low-pressure stage unit is used for refrigeration cycle, i.e. outdoor heat exchanger in low-pressure stage unit is distributed to outdoor environment
Heat is defined as refrigeration low-pressure stage unit.
In winter when heat supply, the heat pump system of the utility model is with heating circulation fortune not exclusively cooling among second throttle
Row.When outdoor heat exchanger does not all need defrosting in low-pressure stage unit, all low-pressure stage units are for heating circulation, i.e., all low
Unit of arbitrarily downgrading is heating low-pressure stage unit.The first solenoid valve 8-1 is opened, and the second solenoid valve 8-2 is opened, the third
Solenoid valve 8-3 is closed.The first interface of four-way reversing valve 2 described in heating low-pressure stage unit is connect with the 4th interface, second connects
Mouth is connect with third interface.Not exclusively cooling Two-stage Compression heating circulation thermal procession is as follows among second throttle: heating low pressure
Low-pressure stage compressor 1-1 in grade unit sucks low-pressure steam from the outdoor heat exchanger 6 through the four-way reversing valve 2, low
It presses steam after the four-way reversing valve 2 and the first check valve 7-1, is passed through with being flowed out from the gas outlet 3-1 of the intercooler 3
Pressure steam mixing in the saturation that the first solenoid valve 8-1 comes out；Be mixed into the degree of superheat it is smaller in press through heat steam described
The suction end of high pressure stage compressor group sucks；Steam is compressed through the high pressure stage compressor 1-2 in the high pressure stage compressor group to be risen
Buckling condenses to be discharged into the indoor heat exchanger 5 after high pressure superheated vapor, to indoor heat transfer, generates heating phenomenon.
The highly pressurised liquid of condensation through the first throttle valve 4-1 reducing pressure by regulating flow become middle pressure damp steam through the second solenoid valve 8-2, in
Between cooler 3 inlet 3-2 enter the intercooler 3.From the liquid outlet 3-3 of the intercooler 3 come out in
Pressure saturated liquid working medium successively becomes low pressure damp steam through the third check valve 7-3, second throttle 4-2 reducing pressure by regulating flow and enters
It is evaporated in the outdoor heat exchanger 6, absorbs the heat of outdoor environment, the low-pressure steam warp come out from the outdoor heat exchanger 6
The four-way reversing valve 2 returns to the low-pressure stage compressor 1-1 suction end, completes not exclusively cooling twin-stage pressure among second throttle
Contraction thermal cycle.
When having, when outdoor heat exchanger needs to defrost in low-pressure stage unit, corresponding low-pressure stage unit is defrosting low-pressure stage list
Member, remaining low-pressure stage unit are heating low-pressure stage unit.The first solenoid valve 8-1 is closed, and the second solenoid valve 8-2 is beaten
It opens, the third solenoid valve 8-3 is closed, defrost 2 first interface of four-way reversing valve described in low-pressure stage unit and second interface company
Connect, third interface is connect with the 4th interface, heat low-pressure stage unit described in four-way reversing valve 2 interface connection it is constant.Upper
It states among second throttle on not exclusively cooling Two-stage Compression heating circulation heating power process basis, room described in low-pressure stage unit of defrosting
The defrosting thermal procession of external heat exchanger 6 is as follows: low-pressure stage compressor 1-1 described in defrosting low-pressure stage unit is through the four-way reversing valve
During the exhaust end sucking degree of superheat of 2 and second one-way valve 7-2 from low-pressure stage compressor 1-1 described in heating low-pressure stage unit are biggish
Steam is pressed, middle pressure steam becomes high pressure superheated vapor after low-pressure stage compressor 1-1 compression boosting and is discharged into the low temperature
It is condensed in outdoor heat exchanger 6, heats the outdoor heat exchanger 6, generated the defrosting phenomenon of the outdoor heat exchanger 6, be condensed into
Highly pressurised liquid working medium become middle pressure damp steam through the second throttle 4-2 reducing pressure by regulating flow, damp steam is unidirectional through the described 4th
Valve 7-4, second solenoid valve 8-2, intercooler 3 inlet 3-2 enter the intercooler 3, complete use low-pressure stage
Not exclusively cooling Two-stage Compression heating circulation among the second throttle of the high temperature hot gas defrosting of compressor discharge.
In summer cooling, the heat pump system of the utility model is with the operation of single stage compress refrigeration cycle, all hiigh pressure stage pressures
Contracting machine is shut down, and all low-pressure stage units are used for refrigeration cycle.The first throttle valve 4-1 aperture regulation to maximum, described first
Solenoid valve 8-1 is closed, and the second solenoid valve 8-2 is closed, and the third solenoid valve 8-3 is opened, the refrigeration low-pressure stage unit
The first interface of middle four-way reversing valve 2 is connect with second interface, third interface is connect with the 4th interface.In refrigeration low-pressure stage unit
The low-pressure stage compressor 1-1 is changed through the third solenoid valve 8-3, second one-way valve 7-2, four-way reversing valve 2 from the interior
Low-pressure steam is sucked in hot device 5, low-pressure steam becomes high pressure steam through institute through refrigeration low-pressure stage compressor 1-1 compression boosting
It states four-way reversing valve 2 and is discharged into the outdoor heat exchanger 6 and condense, to outdoor heat transfer.It is come out from the outdoor heat exchanger 6
Highly pressurised liquid become low pressure damp steam through the second throttle 4-2 reducing pressure by regulating flow, low pressure damp steam is successively unidirectional through the 4th
Valve 7-4, the first throttle valve 4-1 are evaporated into the indoor heat exchanger 5, absorb indoor environment heat, generate refrigeration phenomenon.
The low-pressure steam come out from indoor heat exchanger 5 is returned through the third solenoid valve 8-3, second one-way valve 7-2, four-way reversing valve 2
To the suction end of the 1-1 of low-pressure stage compressor described in refrigeration unit, single stage compress refrigeration cycle is completed.
Since the heat to defrost for defrosting low-pressure stage unit outdoor heat exchanger 6 is from heating when the utility model Winter heat supply
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
When having outdoor heat exchanger 6 described in low-pressure stage unit to need to defrost, to increase defrosting efficiency, the high pressure stage compressor 1-2 can
With whole shutdown, so that the middle pressure working medium of greater flow is flowed to defrosting low-pressure stage unit, realize multiple outdoor heat exchangers 6 simultaneously
When defrosting, 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 institute
It states indoor heat exchanger 5 and continues heat supply.Outdoor heat exchanger 6 described in one defrosting low-pressure stage unit is immediately converted as after defrosting
Low-pressure stage unit is heated, is that outdoor heat exchanger 6 described in other low-pressure stage units defrosts, defrosts to all outdoor heat exchangers 6
It completes, all low-pressure stage cell translations are heating low-pressure stage unit.
The low-pressure stage compressor and high pressure stage compressor can be screw compressor, rotor compressor, helical-lobe compressor
Any one of with piston 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, solenoid valve, hand valve and three can be used in systems
Logical reversal valve replaces.
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)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821150568.1U CN208871901U (en) | 2018-07-20 | 2018-07-20 | Two-stage compression heat pump system with incomplete cooling in the middle of secondary throttling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821150568.1U CN208871901U (en) | 2018-07-20 | 2018-07-20 | Two-stage compression heat pump system with incomplete cooling in the middle of secondary throttling |
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| Publication Number | Publication Date |
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| CN208871901U true CN208871901U (en) | 2019-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821150568.1U Expired - Fee Related CN208871901U (en) | 2018-07-20 | 2018-07-20 | Two-stage compression heat pump system with incomplete cooling in the middle of secondary throttling |
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| CN (1) | CN208871901U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108759156A (en) * | 2018-07-20 | 2018-11-06 | 天津商业大学 | Not exclusively cooling two-stage compression heat pump system among second throttle |
| CN110793230A (en) * | 2019-10-30 | 2020-02-14 | 河南科技大学 | Large-temperature span high-temperature heat pump system |
-
2018
- 2018-07-20 CN CN201821150568.1U patent/CN208871901U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108759156A (en) * | 2018-07-20 | 2018-11-06 | 天津商业大学 | Not exclusively cooling two-stage compression heat pump system among second throttle |
| CN108759156B (en) * | 2018-07-20 | 2023-11-07 | 天津商业大学 | Secondary throttling middle incomplete cooling two-stage compression heat pump system |
| CN110793230A (en) * | 2019-10-30 | 2020-02-14 | 河南科技大学 | Large-temperature span high-temperature heat pump system |
| CN110793230B (en) * | 2019-10-30 | 2021-06-18 | 河南科技大学 | Large-temperature span high-temperature heat pump system |
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