CN105423620B - A kind of efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine - Google Patents
A kind of efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine Download PDFInfo
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- CN105423620B CN105423620B CN201510993754.6A CN201510993754A CN105423620B CN 105423620 B CN105423620 B CN 105423620B CN 201510993754 A CN201510993754 A CN 201510993754A CN 105423620 B CN105423620 B CN 105423620B
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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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
- F25B2500/00—Problems to be solved
- F25B2500/18—Optimization, e.g. high integration of refrigeration components
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- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
A kind of efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine, the outlet of high pressure compressor is connected with the refrigerant inlet of the first condenser, the refrigerant outlet of first condenser is connected by first throttle device with the first entrance of the first gas-liquid separator, the gas vent of first gas-liquid separator is connected with the entrance of high pressure compressor, its liquid outlet passes through check valve, second throttling device is connected with the entrance of evaporator, the outlet of evaporator is connected with the entrance of low pressure compressor, in the outlet of low pressure compressor, one is connected by the first stop valve with the refrigerant inlet of the second condenser, the refrigerant outlet of second condenser is connected with the entrance of second throttling device；Another stock-traders' know-how is crossed the second stop valve and connected with the second entrance of the first gas-liquid separator；Total cooling water inlet is connected by water pump with the second condenser, the first condenser, and the hot water outlet of the first condenser is total hot water outlet.Effectively reduction power consumption of the invention, improving energy efficiency and, increase working range.
Description
Technical field
The present invention relates to field of water heaters, especially a kind of heat pump water-heating machine.
Background technology
The characteristics of Teat pump boiler is due to energy-conserving and environment-protective, add in the increasingly serious especially haze harm of environment and energy problem
Deep turns into a kind of device essential in the life with significant market prospect instantly.But Teat pump boiler is gone back after all
It is to need to consume a large amount of electric energy, therefore improves emphasis and focus that the efficiency of heat pump is a research.In addition, China northeast,
The ground such as northwest winter temperature is relatively low, often reaches the working limit even beyond common Teat pump boiler, therefore expand heat
The working range of pump hot water machine, it is also its improved important directions to improve operation stability.
The content of the invention
In order to which the power consumption for overcoming the shortcomings of existing heat pump water-heating machine is larger, efficiency is relatively low, working range is not wide enough, the present invention
The efficient big temperature rise two-stage throttling cooling during rolling heat pump of a kind of effective reduction power consumption, improving energy efficiency, increase working range is provided
Hot water machine.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine, including high pressure compressor, low pressure compressor,
First condenser, the second condenser, the first gas-liquid separator and evaporator, the outlet of the high pressure compressor and described first cold
The refrigerant inlet connection of condenser, the refrigerant outlet of first condenser is by first throttle device and first gas-liquid
The first entrance connection of separator, the gas vent of first gas-liquid separator is connected with the entrance of the high pressure compressor,
The liquid outlet of first gas-liquid separator is connected by check valve with the entrance of second throttling device, the second throttling dress
The outlet put is connected with the entrance of the evaporator, and the outlet of the evaporator is connected with the entrance of the low pressure compressor, institute
The outlet for stating low pressure compressor is divided into two strands, and one is connected by the first stop valve with the refrigerant inlet of the second condenser, institute
The refrigerant outlet for stating the second condenser is connected with the entrance of the second throttling device；Another stock-traders' know-how crosses the second stop valve and institute
State the second entrance connection of the first gas-liquid separator；
Total cooling water inlet is connected by water pump with the cooling water inlet of the second condenser, the hot water outlet of second condenser
Connected with the cooling water inlet of first condenser, the hot water outlet of first condenser is total hot water outlet.
Further, the outlet of the evaporator is connected with the entrance of the second gas-liquid separator, second gas-liquid separator
Gas vent connected with the entrance of the low pressure compressor.
Further, the outlet of the high pressure compressor is connected with the first oil eliminator entrance, first oil eliminator
Oil export connected with the entrance of the high pressure compressor, the refrigerant outlet of first oil eliminator with described first condensation
The refrigerant inlet connection of device；The outlet of the low pressure compressor is connected with the second oil eliminator entrance, the second oil separation
The oil export of device is connected with the entrance of the low pressure compressor, and it is other that the refrigerant outlet of second oil eliminator is divided into two stocks
It is connected with the entrance of the first stop valve and the entrance of the second stop valve.
Further, defrost branch is set between the refrigerant outlet of second condenser and the entrance of the evaporator
3rd stop valve is installed on pipe, the defrost branch pipe.
The outlet of the evaporator is connected by the 4th stop valve with the entrance of the high pressure compressor, first gas-liquid
The gas vent of separator is connected with the entrance of the 5th stop valve, the outlet of the 5th stop valve with the 4th cut-off valve outlet,
The entrance of high pressure compressor is connected.
Either：The gas vent of second gas-liquid separator enters by the 4th stop valve and the high pressure compressor
Mouthful connection, the gas vent of first gas-liquid separator connects with the entrance of the 5th stop valve, and the 5th stop valve goes out
Mouth is connected with the entrance of the 4th cut-off valve outlet, high pressure compressor.
Beneficial effects of the present invention are mainly manifested in：
1st, throttled using two stages of compression two-stage, greatly expanded compared with single-stage heat pump and use scope, improve efficiency, and
And will low-pressure stage compressor air-discharging cool down after be re-fed into high pressure stage compressor, reduce high pressure stage compressor delivery temperature, can be with
Produce the higher hot water of temperature and improve the stability of a system；
2nd, compared to existing two stages of compression heat pump, two-step heating hot water is dexterously employed, can when hot water temperature rise is larger
To reduce the wasted work of high pressure compressor to a certain degree, that is, further improve system energy efficiency.Essentially, it is existing straight
There is hot type Teat pump boiler larger heat transfer temperature difference to produce larger entropy production, and circulating heat pump water heater then can be by cold water
Mixed with hot water and equally cause larger entropy production, and the present invention reduces the production of above-mentioned entropy, the heating power for improving system is finished
Kind property；
3rd, most suitable pattern can be selected under different seasons, different external condition, season is lifted to greatest extent
Energy-conservation effect, and ensure the stable operation of system.Flexibly, logical too small amount of cut-off Vavle switching how realizes two-stage to the simple pipeline of part
Compression two-step heating pattern, two stages of compression one-level heating mode, low-pressure stage compression single-stage heating mode, hiigh pressure stage compression single-stage add
Heat pattern and hot-gas bypass defrost pattern.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine.
Fig. 2 is the schematic diagram of another efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine.
Fig. 3 is the schematic diagram of another efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
1~Fig. 3 of reference picture, a kind of efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine, including high pressure compressed
Machine 1, low pressure compressor 10, the first condenser 3, the second condenser 13, the first gas-liquid separator 5 and evaporator 8, the high pressure pressure
The outlet of contracting machine 1 is connected with the refrigerant inlet of first condenser 3, and the refrigerant outlet of first condenser 3 passes through
First throttle device 4 is connected with the first entrance of first gas-liquid separator 5, and the gas of first gas-liquid separator 5 goes out
Mouth is connected with the entrance of the high pressure compressor 1, and the liquid outlet of first gas-liquid separator 5 passes through check valve 6 and second
The entrance connection of throttling arrangement 7, the outlet of the second throttling device 7 is connected with the entrance of the evaporator 8, the evaporator
8 outlet is connected with the entrance of the low pressure compressor 10, and the outlet of the low pressure compressor 10 is divided into two strands, and one passes through
One stop valve 12 is connected with the refrigerant inlet of the second condenser 13, the refrigerant outlet of second condenser 13 and described the
The entrance connection of two throttling arrangements 7；The second entrance that another stock-traders' know-how crosses the second stop valve 14 and first gas-liquid separator 5 connects
It is logical；
Total cooling water inlet is connected by water pump 15 with the cooling water inlet of the second condenser 13, the heat of second condenser 13
Water out is connected with the cooling water inlet of first condenser 3, and the hot water outlet of first condenser 3 is total hot water outlet.
Further, the outlet of the evaporator 8 is connected with the entrance of the second gas-liquid separator 9, second gas-liquid separation
The gas vent of device 9 is connected with the entrance of the low pressure compressor 10.
Further, the outlet of the high pressure compressor 1 is connected with the entrance of the first oil eliminator 2, first oil
Oil export from device 2 is connected with the entrance of the high pressure compressor 1, the refrigerant outlet of first oil eliminator 2 with it is described
The refrigerant inlet connection of first condenser 3；The outlet of the low pressure compressor 10 is connected with the entrance of the second oil eliminator 11,
The oil export of second oil eliminator 11 is connected with the entrance of the low pressure compressor 10, the system of second oil eliminator 11
Cryogen outlet is divided into two stocks and is not connected with the entrance of the first stop valve and the entrance of the second stop valve.
Further, defrost is set between the refrigerant outlet of second condenser 13 and the entrance of the evaporator 8
3rd stop valve 16 is installed on branch pipe, the defrost branch pipe
The outlet of the evaporator is connected by the 4th stop valve with the entrance of the high pressure compressor, first gas-liquid
The gas vent of separator is connected with the entrance of the 5th stop valve, the outlet of the 5th stop valve with the 4th cut-off valve outlet,
The entrance of high pressure compressor is connected.
Either：The gas vent of second gas-liquid separator 9 is by the 4th stop valve 17 and the high pressure compressor 1
Entrance connection, the gas vent of first gas-liquid separator 5 connects with the entrance of the 5th stop valve 18, and the described 5th ends
The outlet of valve 18 is exported with the 4th stop valve 17, the entrance of high pressure compressor 1 is connected.
The course of work of the present embodiment is：
Reference picture 1：
Two stages of compression two-step heating pattern：When environment temperature is relatively low, required hot water temperature is again higher, and inlet water temperature
The pattern is used when relatively low, the first stop valve 12 is opened with the second stop valve 14, and high pressure compressor 1, low pressure compressor 10 are equal
Operation, water pump 15 is run.The oil-containing gaseous refrigerant of HTHP exits into the first oil eliminator from the outlet of high pressure compressor 1
2, the lubricating oil in refrigerating agent containing oil is separated in the first oil eliminator and flowed out back from the oil export of the first oil eliminator 2
To suction port of compressor, the refrigerant of HTHP exits into the refrigerant of the first condenser 3 from the refrigerant outlet of oil eliminator
Entry exotherm is condensed, and the liquid refrigerant of high pressure is flowed out after first throttle device 4 from the refrigerant outlet of the first condenser 3
Become the gas-liquid mixed refrigerant of middle pressure and enter the first entrance of the first gas-liquid separator 5, gaseous refrigerant is from the first gas-liquid
The gas vent outflow of separator 5, liquid refrigerant is flowed out after check valve 6 from the liquid outlet of the first gas-liquid separator 5
Become the refrigerant gas of low-temp low-pressure after being mixed with the liquid refrigerant from the second condenser 13 after second throttling device 7
Liquid mixture enters evaporator 8 and absorbs amount of heat, and the low-temp low-pressure gaseous refrigerant after heat absorption evaporation is by the second gas-liquid point
From the entrance that device 9 is then drawn into low pressure compressor 10, the refrigerating agent containing oil of medium temperature and medium pressure is arranged from the outlet of low pressure compressor 10
Go out and enter the second oil eliminator 11, lubricating oil therein returns to low pressure compressor 10 from the oil export outflow of the second oil eliminator 11
Entrance, and the refrigerant of medium temperature and medium pressure is then divided into two strands from the outflow of the refrigerant outlet of the second oil eliminator 11, one process
First stop valve 12 enters the liquid refrigerant that condensation heat release in the second condenser 13 becomes middle pressure, from the system of the second condenser 13
Mixed after cryogen outlet outflow with the refrigerant from one-way valved outlet, another road enters the first gas-liquid by the second stop valve 14
The second entrance of separator 5.Cold water enters after water pump 15 tentatively to be heated in second condenser 13, becomes middle warm water,
Then enter back into the first condenser 3 to be further heated, become after high-temperature-hot-water from the water out of the first condenser 3 outflow supply use
Family.
In order to which the energy-saving effect of the present invention is better described, it shown below is and be based on two stages of compression two-step heating pattern
System simulation result of calculation is simultaneously with traditional single-stage heat pump and hot for the two stages of compression of representative with patent (200720039229.1)
Pump (including injection enthalpy increasing heat pump) is contrasted.During calculating, all parts are modeled according to the conservation of mass and the conservation of energy, compressor
Isentropic efficiency is using (the International Journal of Refrigeration, 2013,36 such as Navarro-Peris
(7)) the equation proposed, ignores pipeline friction loss and leakage heat, and other setup parameters are shown in Table 1, the results are shown in Table 2.
As can be known from the results of Table 2, COP of the invention is highest, higher than two stages of compression heat pump by 21.4%, than traditional list
Level heat pump is even more to be higher by 27.8%.
Table 1
Table 2
Two stages of compression two-step heating pattern：When environment temperature is relatively low, required hot water temperature is again higher, and inlet water temperature
The pattern is used when more higher than environment temperature, the first stop valve 12 closes, the second stop valve 14 is opened, it is high pressure compressor 1, low
Pressure compressor 10 is run, and water pump 15 is run.Running now is compared with regular run mode, due to the first stop valve 12
Close, the second condenser 13 do not work, come out when cold water passes through the second condenser 13 and be not heated from water pump 15, but only the
It is heated in one condenser 3.
Low-pressure stage compresses single-stage heating mode：When environment temperature is of a relatively high, and required hot water temperature it is normal when using should
Pattern.First stop valve 12 is opened, and the second stop valve 14 is closed, and high pressure compressor 1 is closed, and low pressure compressor 10 is run, water pump
15 operations.The outlet of the refrigerating agent containing oil of HTHP from low pressure compressor 10 is discharged into the second oil eliminator 11, therein
Lubricating oil returns to the entrance of low pressure compressor 10 from the oil export outflow of the second oil eliminator 11, and the refrigerant of medium temperature and medium pressure is then
Enter condensation heat release in the second condenser 13 by the first stop valve 12 from the refrigerant outlet outflow of the second oil eliminator 11 to become
Into liquid refrigerant, it is low after the outflow of the refrigerant outlet of the second condenser 13 after second throttling device 7 to become low temperature
The refrigerant air-liquid mixture of pressure enters evaporator 8 and absorbs amount of heat, the low-temp low-pressure gaseous refrigerant warp after heat absorption evaporation
Cross the entrance that the second gas-liquid separator 9 is inhaled into low pressure compressor 10.Cold water enters in the second condenser 13 after water pump 15
It is heated, because the first condenser 3 does not work, hot water is not heated when flowing through the first condenser 3, finally from the first condenser 3
Water out outflow supply user.
Reference picture 2：
When outdoor environment temperature is near or below 0 DEG C, evaporating temperature can reach may on the outside of less than 0 DEG C, evaporator
Meeting frosting freezes, and now needs to carry out defrost to the evaporator of heat pump water-heating machine.Therefore, in the second condensation on the basis of Fig. 1
The 3rd stop valve 16 is added between the refrigerant outlet of device 2 and the entrance of evaporator 8, and is connected with pipeline, it is possible to achieve heat
Gas bypass defrosting function so that heat pump water-heating machine can more stably be run.In addition to increasing defrost power, this flow can be real
The 3rd stop valve 16 is remained turned-off existing function such as Fig. 1, and when realizing Fig. 1 pattern.
Hot-gas bypass defrost pattern：First stop valve 12 is opened, the second stop valve 14 is closed, the 3rd stop valve 16 is opened,
High pressure compressor 1 is closed, and low pressure compressor 10 is run, and water pump 15 is closed.The gaseous state refrigerating agent containing oil of HTHP is from low pressure pressure
The outlet of contracting machine 10 is discharged into the second oil eliminator 11, and lubricating oil therein is returned from the oil export outflow of the second oil eliminator 11
Return the entrance of low pressure compressor 10, and high temperature liquid refrigerant then passes through the from the outflow of the refrigerant outlet of the second oil eliminator 11
One stop valve 12 and the second condenser 13, because water pump 15 is closed, the second condenser 13 does not work, and high temperature liquid refrigerant does not exist
Exchanged heat in second condenser 13, high temperature liquid refrigerant is after the refrigerant outlet outflow of the second condenser 13 by the 3rd
Enter the heat release of evaporator 8 after stop valve 16 so that evaporator outer wall defrost, refrigerant passes through second from the outlet outflow of evaporator 8
The final entrance for being inhaled into low pressure compressor 10 after gas-liquid separator 9.
Reference picture 3：
When environment temperature is of a relatively high, and required hot water temperature it is normal when, use low pressure compressor 10 in Fig. 1 embodiment
Single stage compress heating mode is carried out, and the 4th stop valve 17 and the 5th stop valve 18 are added in Fig. 3 so that single-stage pressure is carried out
High pressure compressor 1 can also be used during contracting heating, due to rated power and the cylinder chi of high pressure compressor 1 and low pressure compressor 10
Very little difference, therefore the heating power scope of single stage compress heating mode is expanded, while also improving the utilization of high pressure compressor
Rate.This flow can also realize Fig. 1 and Fig. 2 all operation moulds in addition to it can realize hiigh pressure stage compression single-stage heating mode
Formula, need to only remain turned-off the 4th stop valve 17, the 5th stop valve 18 is kept it turned on.
Hiigh pressure stage compresses single-stage heating mode：First stop valve 12, the second stop valve 14, the 3rd stop valve 16, the 5th section
Only valve 18 is closed, and the 4th stop valve 17 is opened, and high pressure compressor 1 is opened with water pump 15, and low pressure compressor 10 is closed.HTHP
Oil-containing gaseous refrigerant export the lubricating oil that exits into the first oil eliminator 2, refrigerating agent containing oil from high pressure compressor 1 and exist
First oil eliminator is separated and outflows back to suction port of compressor from the oil export of the first oil eliminator 2, HTHP
Refrigerant exits into the refrigerant inlet exothermic condensation of the first condenser 3, the liquid of high pressure from the refrigerant outlet of oil eliminator
Refrigerant becomes the gas-liquid mixed refrigeration of middle pressure from the refrigerant outlet outflow of the first condenser 3 after first throttle device 4
Agent simultaneously enters the first entrance of the first gas-liquid separator 5 and passes through check valve 6 from the liquid outlet outflow of the first gas-liquid separator 5
Pass through second throttling device 7 again afterwards, the refrigerant air-liquid mixture for becoming low-temp low-pressure enters the absorption amount of heat of evaporator 8,
Low-temp low-pressure gaseous refrigerant after heat absorption evaporation is returned by the second gas-liquid separator 9 and then then by Section of four stop valve 17
Return the entrance of high pressure compressor 1.Cold water flows through the second condenser 13 after water pump 15 but not heated, then enters back into first cold
Condenser 3 is heated, and is become after high-temperature-hot-water from the water out of the first condenser 3 outflow supply user.
Claims (8)
1. a kind of efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine, it is characterised in that：Including high pressure compressor, low
Press compressor, the first condenser, the second condenser, the first gas-liquid separator and evaporator, the outlet of the high pressure compressor with
The refrigerant inlet connection of first condenser, the refrigerant outlet of first condenser passes through first throttle device and institute
State the first entrance connection of the first gas-liquid separator, gas vent and the high pressure compressor of first gas-liquid separator
Entrance is connected, and the liquid outlet of first gas-liquid separator is connected by check valve with the entrance of second throttling device, described
The outlet of second throttling device is connected with the entrance of the evaporator, the outlet of the evaporator and entering for the low pressure compressor
Mouth connection, the outlet of the low pressure compressor is divided into two strands, and one enters by refrigerant of the first stop valve and the second condenser
Mouth connection, the refrigerant outlet of second condenser is connected with the entrance of the second throttling device；Another stock-traders' know-how crosses second
Stop valve is connected with the second entrance of first gas-liquid separator；
Total cooling water inlet is connected by water pump with the cooling water inlet of the second condenser, the hot water outlet of second condenser and institute
The cooling water inlet connection of the first condenser is stated, the hot water outlet of first condenser is total hot water outlet.
2. efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine as claimed in claim 1, it is characterised in that：It is described
The outlet of evaporator is connected with the entrance of the second gas-liquid separator, gas vent and the low pressure of second gas-liquid separator
The entrance connection of compressor.
3. efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine as claimed in claim 1, it is characterised in that：It is described
The outlet of high pressure compressor is connected with the first oil eliminator entrance, oil export and the high pressure compressed of first oil eliminator
The entrance connection of machine, the refrigerant outlet of first oil eliminator is connected with the refrigerant inlet of first condenser；Institute
The outlet for stating low pressure compressor is connected with the second oil eliminator entrance, the oil export of second oil eliminator and the low pressure pressure
The entrance connection of contracting machine, the refrigerant outlet of second oil eliminator be divided into two stocks not with the entrance of the first stop valve and the
The entrance connection of two stop valves.
4. efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine as claimed in claim 2, it is characterised in that：It is described
The outlet of high pressure compressor is connected with the first oil eliminator entrance, oil export and the high pressure compressed of first oil eliminator
The entrance connection of machine, the refrigerant outlet of first oil eliminator is connected with the refrigerant inlet of first condenser；Institute
The outlet for stating low pressure compressor is connected with the second oil eliminator entrance, the oil export of second oil eliminator and the low pressure pressure
The entrance connection of contracting machine, the refrigerant outlet of second oil eliminator be divided into two stocks not with the entrance of the first stop valve and the
The entrance connection of two stop valves.
5. the efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine as described in one of Claims 1 to 4, its feature exists
In：Defrost branch pipe, the defrost branch pipe are set between the refrigerant outlet of second condenser and the entrance of the evaporator
The 3rd stop valve of upper installation.
6. the efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine as described in one of Claims 1 to 4, its feature exists
In：The outlet of the evaporator is connected by the 4th stop valve with the entrance of the high pressure compressor, first gas-liquid separation
The gas vent of device is connected with the entrance of the 5th stop valve, the outlet of the 5th stop valve and the 4th cut-off valve outlet, high pressure
The entrance of compressor is connected.
7. efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine as claimed in claim 5, it is characterised in that：It is described
The outlet of evaporator is connected by the 4th stop valve with the entrance of the high pressure compressor, the gas of first gas-liquid separator
Outlet connect with the entrance of the 5th stop valve, and the outlet of the 5th stop valve and the 4th ends valve outlet, high pressure compressor
Entrance is connected.
8. efficient big temperature rise two-stage throttling cooling during rolling heat pump water-heating machine as claimed in claim 2, it is characterised in that：It is described
The gas vent of second gas-liquid separator is connected by the 4th stop valve with the entrance of the high pressure compressor, first gas-liquid
The gas vent of separator is connected with the entrance of the 5th stop valve, the outlet of the 5th stop valve with the 4th cut-off valve outlet,
The entrance of high pressure compressor is connected.
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| CN109059279A (en) * | 2017-06-13 | 2018-12-21 | 上海海立电器有限公司 | Compressor heat pumping system with double water temperature |
| CN110056936B (en) * | 2019-04-24 | 2020-09-15 | 东北大学 | Off-peak electricity heat storage cascade heat pump heat supply method |
| CN111811157A (en) * | 2020-06-01 | 2020-10-23 | 青岛经济技术开发区海尔热水器有限公司 | Heat exchange equipment, water heater and air conditioner |
| CN117073256A (en) * | 2023-08-07 | 2023-11-17 | 同方智慧能源有限责任公司 | Snow field double-temperature-zone refrigerating system |
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| FR2973863B1 (en) * | 2011-04-11 | 2014-12-26 | Aj Tech | HIGH PERFORMANCE BI-STAGE HEAT PUMP |
| CN204254921U (en) * | 2014-09-22 | 2015-04-08 | 广东申菱空调设备有限公司 | The low-temperature cold water unit structure of single machine two-stage |
| CN104833087A (en) * | 2015-04-30 | 2015-08-12 | 南京理工大学 | Cascading middle and high-temperature air source heat pump hot water machine set |
| CN205332599U (en) * | 2015-12-25 | 2016-06-22 | 浙江工业大学 | But heat pump water heater of intercooling in big temperature rise two -stage of efficient throttle |
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