CN104121721A - Single-and-double-stage switchable heat pump - Google Patents

Single-and-double-stage switchable heat pump Download PDF

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CN104121721A
CN104121721A CN201410314899.4A CN201410314899A CN104121721A CN 104121721 A CN104121721 A CN 104121721A CN 201410314899 A CN201410314899 A CN 201410314899A CN 104121721 A CN104121721 A CN 104121721A
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heat exchanger
low
heat pump
compressor
pressure system
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CN104121721B (en
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刘远辉
王超毅
高翔
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Guangdong PHNIX Eco Energy Solution Ltd
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Guangdong PHNIX Eco Energy Solution Ltd
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Abstract

The invention discloses a single-and-double-stage switchable heat pump and belongs to the field of heat pump systems. The heat pump comprises a low-pressure system, a high-pressure system and a main heat exchanger connected in parallel between the low-pressure system and the high-pressure system. A first compressor and a first heat exchanger are arranged in the low-pressure system and connected in series with a left side pipeline of the main heat exchanger. A second compressor and a second heat exchanger are arranged in the high-pressure system and connected in series with a right side pipeline of the main heat exchanger. According to the single-and-double-stage switchable heat pump, the low-pressure system and the high-pressure system are formed by single-stage heat pump bodies and connected in parallel through the main heat exchanger, single-stage heat pump refrigerating/heating circulation can be performed as long as the first compressor in the low-pressure system is independently turned on, and cascade heat pump heating operation can be achieved as long as the second compressor is firstly turned on and the first compressor is turned on afterwards. The heat pump system can be freely switched between the single-stage heat pump mode and the cascade heat pump mode, and therefore the purposes of fully utilizing the advantages of both the modes and effectively saving energy and reducing emissions are achieved.

Description

The switchable heat pump of a kind of single twin-stage
Technical field
The present invention relates to a kind of heat pump, particularly relate to the switchable heat pump of a kind of single twin-stage.
Background technology
Although common cascade type heat pump has well met the demand of low-temperature heating and high-temperature-hot-water, when unit refrigerating operaton, its refrigerating efficiency is not high, can only meet simple defrosting, and cannot meet the demand of highly effective refrigeration.And common cascade type heat pump is in environment temperature under the high environment of 0 ℃~15 ℃ during heating, its heating efficiency is generally not high.And single-stage heat pump has advantages of that refrigerating operaton efficiency is high and epipodium temperature heating heating efficiency is high, therefore need to design a heat pump that can freely switch single-stage heat pump and cascade type heat pump operation, the demand that can meet year round cooling and heat.
Summary of the invention
For addressing the above problem, the invention provides a kind of changeable heat pump of single twin-stage that can freely switch to single-stage operation of heat pump or cascade type heat pump operation.
The technical solution adopted for the present invention to solve the technical problems is:
The switchable heat pump of a kind of single twin-stage, comprise low-pressure system and high-pressure system and be connected in parallel on low-pressure system and high-pressure system between main heat exchanger, in low-pressure system, be provided with the first compressor and the First Heat Exchanger of connecting with the left side pipeline of main heat exchanger, in high-pressure system, be provided with the second compressor and second heat exchanger of connecting with main heat exchanger right side pipeline.
Be further used as the improvement of technical solution of the present invention, in low-pressure system, be also provided with by cross valve and be series at the low-pressure end heat exchanger between the first compressor and main heat exchanger.
Be further used as the improvement of technical solution of the present invention, in low-pressure system, be also provided with the low-pressure end heat exchanger in parallel with main heat exchanger.
Be further used as the improvement of technical solution of the present invention, between the output of the input of First Heat Exchanger and the first compressor and main heat exchanger, be connected with the first economizer.
Be further used as the improvement of technical solution of the present invention, between the output of the input of main heat exchanger and the second compressor and the second heat exchanger, be connected with the second economizer.
Be further used as the improvement of technical solution of the present invention, with in main heat exchanger, be also provided with three heat exchange pipeline in parallel with two heat exchange pipelines in main heat exchanger, being connected to be provided with by triple valve with the two ends of the 3rd heat exchange pipeline is connected to respectively the inlet side of the second heat exchanger and the water-circulating pipe of outlet side.
Be further used as the improvement of technical solution of the present invention, be connected with low-pressure end heat exchanger and be provided with water-circulating pipe and be arranged at the pulsating pump on water-circulating pipe.
Be further used as the improvement of technical solution of the present invention, being connected with low-pressure end heat exchanger to be provided with by triple valve is connected to respectively the inlet side of the second heat exchanger and the water-circulating pipe of outlet side.
Beneficial effect of the present invention: low-pressure system and high-pressure system that the switchable heat pump of this single twin-stage consists of single-stage heat pump main heat exchanger are together in parallel, open separately the first compressor in low-pressure system and can carry out single-stage heat pump refrigerating/heat circulation, first open the second compressor, open subsequently the first compressor and can realize the heating operation of cascade type heat pump, this heat pump can freely switch in single-stage heat pump and cascade type heat pump pattern, reach and make full use of each pattern advantage, and the object of effective energy-saving and emission-reduction.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is first embodiment of the invention overall structure schematic diagram;
Fig. 2 is second embodiment of the invention overall structure schematic diagram;
Fig. 3 is third embodiment of the invention overall structure schematic diagram.
The specific embodiment
With reference to Fig. 1~Fig. 3, the present invention is the switchable heat pump of a kind of single twin-stage, comprise low-pressure system 1 and high-pressure system 2 and be connected in parallel on low-pressure system 1 and the main heat exchanger 3 of 2 of high-pressure systems, in low-pressure system 1, be provided with the first compressor 11 and the First Heat Exchanger 12 of connecting with the left side pipeline of main heat exchanger 3, in high-pressure system 2, be provided with the second compressor 21 and second heat exchanger 22 of connecting with main heat exchanger 3 right side pipelines.
Low-pressure system 1 and high-pressure system 2 that the switchable heat pump of this single twin-stage consists of single-stage heat pump main heat exchanger 3 are together in parallel, open separately the first compressor 11 in low-pressure system 1 and can carry out single-stage heat pump refrigerating/heat circulation, first open the second compressor 21, open subsequently the first compressor 11 and can realize the heating operation of cascade type heat pump, this heat pump can freely switch in single-stage heat pump and cascade type heat pump pattern, reach and make full use of each pattern a little, and the object of effective energy-saving and emission-reduction.
As the preferred embodiment of the present invention, in low-pressure system 1, be also provided with the low-pressure end heat exchanger 14 that is series at 3 of the first compressor 11 and main heat exchangers by cross valve 13.
As the preferred embodiment of the present invention, be connected with low-pressure end heat exchanger 14 and be provided with water-circulating pipe 4 and be arranged at the pulsating pump 5 on water-circulating pipe 4.
As the preferred embodiment of the present invention, between the output of the input of First Heat Exchanger 12 and the first compressor 11 and main heat exchanger 3, be connected with the first economizer 15.
As the preferred embodiment of the present invention, between the output of the input of main heat exchanger 3 and the second compressor 21 and the second heat exchanger 22, be connected with the second economizer 23.
In the first embodiment, open separately the first compressor 11, can realize the single-stage operation of heat pump under this state.Under this state, the first compressor 11 is discharged the refrigerant gas of HTHP, high-temperature high-pressure refrigerant gas flows to from the D mouth of cross valve 13, from the C mouth of cross valve 13, flow out, enter into the refrigerant liquid that low-pressure end heat exchanger 14 carries out becoming after condensation cryogenic high pressure, the cryogenic high pressure refrigerant liquid flowing out from low-pressure end heat exchanger 14 minute two-way after main heat exchanger 3 flows, and a road is major loop, Wei Fu loop, another road.The refrigerant liquid of major loop enters the first economizer 15, the refrigerant liquid in auxiliary loop becomes the gas-liquid mixture of low pressure after electric expansion valve step-down, also enter the first economizer 15 simultaneously, two-way cold-producing medium produces after heat exchange in the first economizer 15, and the cold-producing medium draw heat in auxiliary loop is sucked by the auxilairy air intake of the first compressor 11 after becoming gas.The cold-producing medium of main road flows out from the cold outlet of mistake of the first economizer 15, becomes after subcooled liquid, in flow throttling device, after reducing pressure by regulating flow, enters in First Heat Exchanger 12 and evaporates.Complete E mouth, S mouth that evaporation low-temperature low-pressure refrigerant gas afterwards passes through cross valve 13 successively, enter the first gas-liquid separator 16, then flow out from the first gas-liquid separator 16, from the gas returning port of the first compressor 11, get back to the first compressor 11.Now, extraneous running water enters into low-pressure end heat exchanger 14 through pulsating pump 5 and carries out heat exchange with high temperature refrigerant, and after heat exchange, hot water flows out through the delivery port of low-pressure end heat exchanger 14, and heating and hot water are provided.By cross valve 13 commutation refrigerating operatons, also can realize highly effective refrigeration simultaneously.
In the time of need to using Cascade type heat pump system to heat, first open the second compressor 21, then open the first compressor 11.In high-pressure system 2 sides, the second compressor 21 is discharged the refrigerant gas of HTHP, high-temperature high-pressure refrigerant gas enters in the second heat exchanger 22, carry out becoming cryogenic high pressure refrigerant liquid after heat exchange with the cold water entering in the second heat exchanger 22 simultaneously, the cryogenic high pressure refrigerant liquid flowing out from the second heat exchanger 22 divides two-way to flow, one tunnel is major loop, Wei Fu loop, another road.The refrigerant liquid of major loop enters the second economizer 23, the refrigerant liquid in auxiliary loop becomes the gas-liquid mixture of low pressure after electric expansion valve step-down, also enter the second economizer 23 simultaneously, two-way cold-producing medium produces after heat exchange in the second economizer 23, and the cold-producing medium draw heat in auxiliary loop is sucked by the auxilairy air intake of the second compressor 21 after becoming gas.The cold-producing medium of main road flows out from the cold outlet of mistake of the second economizer 23, becomes after subcooled liquid, and reducing pressure by regulating flow in flow throttling device, then flow in main heat exchanger 3.The refrigerant liquid of low-temp low-pressure has absorbed main heat exchanger 3 heat that condensation discharges in low-pressure system for evaporation in main heat exchanger 3, complete evaporation low-temperature low-pressure refrigerant gas afterwards and enter the second gas-liquid separator 24, from the second gas-liquid separator 24, flow out again, from the gas returning port of the second compressor 21, get back to the second compressor 21.Now, the water inlet of extraneous running water by the second heat exchanger 22 enters with high temperature refrigerant and carries out heat exchange, and the hot water after heat exchange flows out by the delivery port of the second heat exchanger 22 again, and high-temperature-hot-water is provided.
While using cascade type heat pump, in low-pressure system 1 side, the first compressor 11 is discharged the refrigerant gas of HTHP, high-temperature high-pressure refrigerant gas flows to from the D mouth of cross valve 13, from the C mouth of cross valve 13, flow out, by low-pressure end heat exchanger 14, enter into the refrigerant liquid that main heat exchanger 3 carries out becoming after condensation cryogenic high pressure, the cryogenic high pressure refrigerant liquid flowing out from main heat exchanger 3 divides two-way to flow, one tunnel is major loop, Wei Fu loop, another road.The refrigerant liquid of major loop enters the first economizer 15, the refrigerant liquid in auxiliary loop becomes the gas-liquid mixture of low pressure after electric expansion valve step-down, also enter the first economizer 15 simultaneously, two-way cold-producing medium produces after heat exchange in the first economizer 15, and the cold-producing medium draw heat in auxiliary loop is sucked by the auxilairy air intake of the first compressor 11 after becoming gas.The cold-producing medium of main road flows out from the cold outlet of mistake of the first economizer 15, becomes after subcooled liquid, in flow throttling device, after reducing pressure by regulating flow, enters in First Heat Exchanger 12 and evaporates.Complete E mouth, S mouth that evaporation low-temperature low-pressure refrigerant gas afterwards passes through cross valve 13 successively, enter the first gas-liquid separator 16, then flow out from the first gas-liquid separator 16, from the gas returning port of the first compressor 11, get back to the first compressor 11.
As the preferred embodiment of the present invention, in low-pressure system 1, be also provided with the low-pressure end heat exchanger 14 in parallel with main heat exchanger 3.
As the preferred embodiment of the present invention, being connected with low-pressure end heat exchanger 14 to be provided with by triple valve is connected to respectively second inlet side of heat exchanger 22 and the water-circulating pipe of outlet side 4.
As the preferred embodiment of the present invention, between the output of the input of First Heat Exchanger 12 and the first compressor 11 and main heat exchanger 3, be connected with the first economizer 15.
As the preferred embodiment of the present invention, between the output of the input of main heat exchanger 3 and the second compressor 21 and the second heat exchanger 22, be connected with the second economizer 23.
In a second embodiment, low-pressure end heat exchanger 14 is connected in parallel to each other with main heat exchanger 3, and at the air inlet of low-pressure end heat exchanger 14 and the air inlet of main heat exchanger 3, is provided with the first electromagnetism two-port valve 17 and the second electromagnetism two-port valve 18 respectively.Under this state, open separately the first compressor 11, can realize single-stage operation of heat pump.During use, the first electromagnetism two-port valve 17 is opened, the second electromagnetism two-port valve 18 cuts out, the first compressor 11 is discharged the refrigerant gas of HTHP, and high-temperature high-pressure refrigerant gas flows to from the D mouth of cross valve 13, from the C mouth of cross valve 13, flows out, enter the refrigerant liquid that carries out becoming after condensation cryogenic high pressure in low-pressure end heat exchanger 14, the cryogenic high pressure refrigerant liquid flowing out from low-pressure end heat exchanger 14 divides two-way to flow, and a road is major loop, Wei Fu loop, another road.The refrigerant liquid of major loop enters the first economizer 15, the refrigerant liquid in auxiliary loop becomes the gas-liquid mixture of low pressure after electric expansion valve step-down, also enter the first economizer 15 simultaneously, two-way cold-producing medium produces after heat exchange in the first economizer 15, and the cold-producing medium draw heat in auxiliary loop is sucked by the auxilairy air intake of the first compressor 11 after becoming gas.The cold-producing medium of main road flows out from the cold outlet of mistake of the first economizer 15, becomes after subcooled liquid, in flow throttling device, after reducing pressure by regulating flow, enters in First Heat Exchanger 12 and evaporates.Complete E mouth, S mouth that evaporation low-temperature low-pressure refrigerant gas afterwards passes through cross valve 13 successively, enter the first gas-liquid separator, then flow out from the first gas-liquid separator 16, from the gas returning port of the first compressor 11, get back to the first compressor 11.Now, extraneous running water, through pulsating pump 5, enters into low-pressure end heat exchanger 14 by T-way water valve and carries out heat exchange with high temperature refrigerant, and after heat exchange, hot water flows out by T-way water valve again, and heating and hot water are provided.By cross valve 13 commutation refrigerating operatons, also can realize highly effective refrigeration simultaneously.
While using cascade type heat pump, in high-pressure system 2 sides, the second compressor 21 is discharged the refrigerant gas of HTHP, high-temperature high-pressure refrigerant gas enters in the second heat exchanger 22, carry out becoming cryogenic high pressure refrigerant liquid after heat exchange with the cold water entering in the second heat exchanger 22 simultaneously, the cryogenic high pressure refrigerant liquid flowing out from the second heat exchanger 22 divides two-way to flow, and a road is major loop, Wei Fu loop, another road.The refrigerant liquid of major loop enters the second economizer 23, the refrigerant liquid in auxiliary loop becomes the gas-liquid mixture of low pressure after electric expansion valve step-down, also enter the second economizer 23 simultaneously, two-way cold-producing medium produces after heat exchange in the second economizer 23, and the cold-producing medium draw heat in auxiliary loop is sucked by the auxilairy air intake of the second compressor 21 after becoming gas.The cold-producing medium of main road flows out from the cold outlet of mistake of the second economizer 23, becomes after subcooled liquid, and reducing pressure by regulating flow in flow throttling device, then flow in main heat exchanger 3.The refrigerant liquid of low-temp low-pressure has absorbed main heat exchanger 3 heat that condensation discharges in low-pressure system for evaporation in main heat exchanger 3, complete E mouth, S mouth that evaporation low-temperature low-pressure refrigerant gas afterwards passes through cross valve 13 successively, enter the second gas-liquid separator 24, from the second gas-liquid separator 24, flow out again, from the gas returning port of the second compressor 21, get back to the second compressor 21.Now, extraneous running water enters the second heat exchanger 22 by T-way water valve and carries out heat exchange with high temperature refrigerant, and the hot water after heat exchange flows out by T-way water valve again, and high-temperature-hot-water is provided.
Now, in low-pressure system 1 side, the first compressor 11 is discharged the refrigerant gas of HTHP, high-temperature high-pressure refrigerant gas flows to from the D mouth of cross valve 13, from the C mouth of cross valve 13, flow out, enter into the refrigerant liquid that main heat exchanger 3 carries out becoming after condensation cryogenic high pressure, the cryogenic high pressure refrigerant liquid flowing out from main heat exchanger 3 divides two-way to flow, one tunnel is major loop, Wei Fu loop, another road.The refrigerant liquid of major loop enters the first economizer 15, the refrigerant liquid in auxiliary loop becomes the gas-liquid mixture of low pressure after electric expansion valve step-down, also enter the first economizer 15 simultaneously, two-way cold-producing medium produces after heat exchange in the first economizer 15, and the cold-producing medium draw heat in auxiliary loop is sucked by the auxilairy air intake of the first compressor 11 after becoming gas.The cold-producing medium of main road flows out from the cold outlet of mistake of the first economizer 15, becomes after subcooled liquid, in flow throttling device, after reducing pressure by regulating flow, enters in First Heat Exchanger 12 and evaporates.Complete E mouth, S mouth that evaporation low-temperature low-pressure refrigerant gas afterwards passes through cross valve 13 successively, enter the first gas-liquid separator 16, then flow out from the first gas-liquid separator 16, from the gas returning port of the first compressor 11, get back to the first compressor 11.
As the preferred embodiment of the present invention, in the 3rd embodiment, with in main heat exchanger 3, be also provided with three heat exchange pipeline in parallel with two heat exchange pipelines in main heat exchanger 3, being connected to be provided with by triple valve with the two ends of the 3rd heat exchange pipeline is connected to respectively second inlet side of heat exchanger 22 and the water-circulating pipe of outlet side 4.
In the 3rd embodiment, dispensed the setting of low-pressure end heat exchanger 14.While carrying out single-stage operation of heat pump refrigeration, directly by main heat exchanger 3 inside left heat exchanger tube and the 3rd heat exchange pipeline, carry out exchange heat realization and heat.By cross valve 13 commutation refrigerating operatons, also can realize highly effective refrigeration simultaneously.
And while using Cascade type heat pump system, in high-pressure system 2 sides, the second compressor 21 is discharged the refrigerant gas of HTHP, high-temperature high-pressure refrigerant gas enters in the second heat exchanger 22, carry out becoming cryogenic high pressure refrigerant liquid after heat exchange with the cold water entering in the second heat exchanger 22 simultaneously, the cryogenic high pressure refrigerant liquid flowing out from the second heat exchanger 22 divides two-way to flow, and a road is major loop, Wei Fu loop, another road.The refrigerant liquid of major loop enters the second economizer 23, the refrigerant liquid in auxiliary loop becomes the gas-liquid mixture of low pressure after electric expansion valve step-down, also enter the second economizer 23 simultaneously, two-way cold-producing medium produces after heat exchange in the second economizer 23, and the cold-producing medium draw heat in auxiliary loop is sucked by the auxilairy air intake of the second compressor 21 after becoming gas.The cold-producing medium of main road flows out from the cold outlet of mistake of the second economizer 23, becomes after subcooled liquid, and reducing pressure by regulating flow in flow throttling device, then enter in main heat exchanger 3 right side heat exchange pipelines.The refrigerant liquid of low-temp low-pressure has absorbed heat that main heat exchanger 3 inside left heat exchange pipelines discharge for evaporation, complete E mouth, S mouth that evaporation low-temperature low-pressure refrigerant gas afterwards passes through cross valve 13 successively, enter the second gas-liquid separator 24, from the second gas-liquid separator 24, flow out again, from the gas returning port of the second compressor 21, get back to the second compressor 21.Now, extraneous running water enters the second heat exchanger 22 by T-way water valve and carries out heat exchange with high temperature refrigerant, and the hot water after heat exchange flows out by T-way water valve again, and high-temperature-hot-water is provided.
Now, in low-pressure system 1 side, the first compressor 11 is discharged the refrigerant gas of HTHP, high-temperature high-pressure refrigerant gas flows to from the D mouth of cross valve 13, from the C mouth of cross valve 13, flow out, enter into the refrigerant liquid that main heat exchanger 3 inside left heat exchanger channels carry out becoming after condensation cryogenic high pressure, the cryogenic high pressure refrigerant liquid flowing out from low-pressure end heat exchanger 14 divides two-way to flow, one tunnel is major loop, Wei Fu loop, another road.The refrigerant liquid of major loop enters the first economizer 15, the refrigerant liquid in auxiliary loop becomes the gas-liquid mixture of low pressure after electric expansion valve step-down, also enter the first economizer 15 simultaneously, two-way cold-producing medium produces after heat exchange in the first economizer 15, and the cold-producing medium draw heat in auxiliary loop is sucked by the auxilairy air intake of the first compressor 11 after becoming gas.The cold-producing medium of main road flows out from the cold outlet of mistake of the first economizer 15, becomes after subcooled liquid, in flow throttling device, after reducing pressure by regulating flow, enters in First Heat Exchanger 12 and evaporates.Complete E mouth, S mouth that evaporation low-temperature low-pressure refrigerant gas afterwards passes through cross valve 14 successively, enter the first gas-liquid separator 16, then flow out from the first gas-liquid separator 16, from the gas returning port of the first compressor 11, get back to the first compressor 11.
This system incorporates single-stage heat pump in cascade high-temperature heat pump system, according to the high advantage of single-stage heat pump refrigerating operational efficiency and cascade high-temperature heat pump ultralow temperature heating effect advantage good, that can produce high-temperature-hot-water, carry out rationally switching and using, make the functions such as unit can be realized refrigeration, heats, domestic hot-water, high-temperature-hot-water.
When unit during heating, switches to the work of single-stage heat pump by unit in environment temperature under the high environment of 0 ℃-15 ℃, take full advantage of the advantage that single-stage heat pump can efficiently heat in epipodium temperature, made up the low deficiency of cascade type heat pump epipodium temperature heating efficiency.
In the first and second embodiment, single-stage heat pump adds that by low-pressure system 1 low-pressure end heat exchanger 14 forms, and in the 3rd embodiment, single-stage heat pump is exactly low-pressure system 1, and input cost is not high.Only need to open single-stage operation of heat pump most of season, is just equal to and only needs to open separately low-pressure system operation most of season, just can meet refrigeration, heating, domestic hot-water's demand, thereby save the energy.
During Defrost operation, also only need to open low-pressure system 1 and defrost separately, without opening high-pressure system 2 defrostings, realize one-level defrost.Promoted unit efficiency.
Certainly, the invention is not limited to above-mentioned embodiment, those of ordinary skill in the art also can make equivalent variations or replacement under the prerequisite without prejudice to spirit of the present invention, and the modification that these are equal to or replacement are all included in the application's claim limited range.

Claims (8)

1. the switchable heat pump of single twin-stage, it is characterized in that: comprise low-pressure system (1) and high-pressure system (2) and be connected in parallel on described low-pressure system (1) and high-pressure system (2) between main heat exchanger (3), in described low-pressure system (1), be provided with the first compressor (11) and the First Heat Exchanger (12) of connecting with the left side pipeline of main heat exchanger (3), in described high-pressure system (2), be provided with the second compressor (21) and second heat exchanger (22) of connecting with main heat exchanger (3) right side pipeline.
2. the switchable heat pump of single twin-stage according to claim 1, is characterized in that: in described low-pressure system (1), be also provided with by cross valve (13) and be series at the low-pressure end heat exchanger (14) between the first compressor (11) and main heat exchanger (3).
3. the switchable heat pump of single twin-stage according to claim 1, is characterized in that: in described low-pressure system (1), be also provided with the low-pressure end heat exchanger (14) in parallel with main heat exchanger (3).
4. according to the switchable heat pump of single twin-stage described in claim 2 or 3, it is characterized in that: between the output of the input of described First Heat Exchanger (12) and the first compressor (11) and main heat exchanger (3), be connected with the first economizer (15).
5. according to the switchable heat pump of single twin-stage described in any one in claim 1~3, it is characterized in that: between the output of the input of described main heat exchanger (3) and the second compressor (21) and the second heat exchanger (22), be connected with the second economizer (23).
6. the switchable heat pump of single twin-stage according to claim 1, it is characterized in that: three heat exchange pipeline in parallel with being also provided with two heat exchange pipelines interior with main heat exchanger (3) in described main heat exchanger (3), being connected with the two ends of described the 3rd heat exchange pipeline to be provided with by triple valve is connected to respectively the inlet side of the second heat exchanger (22) and the water-circulating pipe (4) of outlet side.
7. the switchable heat pump of single twin-stage according to claim 2, is characterized in that: be connected with described low-pressure end heat exchanger (14) and be provided with water-circulating pipe (4) and be arranged at the pulsating pump (5) on described water-circulating pipe (4).
8. the switchable heat pump of single twin-stage according to claim 3, is characterized in that: being connected with described low-pressure end heat exchanger (14) to be provided with by triple valve is connected to respectively the inlet side of the second heat exchanger (22) and the water-circulating pipe (4) of outlet side.
CN201410314899.4A 2014-07-02 2014-07-02 Single-and-double-stage switchable heat pump Active CN104121721B (en)

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CN105937822A (en) * 2016-06-21 2016-09-14 广东芬尼克兹节能设备有限公司 Cascade type high-temperature heat pump with high defrosting performance and control method of cascade type high-temperature heat pump
CN115371289A (en) * 2022-07-19 2022-11-22 日出东方控股股份有限公司 Variable-pressure-ratio coupling heat pump system and control method thereof
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CN115371289B (en) * 2022-07-19 2023-11-03 日出东方控股股份有限公司 Variable-pressure ratio coupling heat pump system and control method thereof
CN115978879A (en) * 2023-03-21 2023-04-18 昆明理工大学 High-efficient roast room-freezer coupled system
CN115978879B (en) * 2023-03-21 2023-06-13 昆明理工大学 Efficient curing barn-freezer coupling system

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