CN108253653B - Heat pump system with variable flow single-stage compression cycle and cascade cycle - Google Patents
Heat pump system with variable flow single-stage compression cycle and cascade cycle Download PDFInfo
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- CN108253653B CN108253653B CN201810234518.XA CN201810234518A CN108253653B CN 108253653 B CN108253653 B CN 108253653B CN 201810234518 A CN201810234518 A CN 201810234518A CN 108253653 B CN108253653 B CN 108253653B
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- 230000006835 compression Effects 0.000 title claims abstract description 29
- 238000007906 compression Methods 0.000 title claims abstract description 29
- 238000005057 refrigeration Methods 0.000 claims abstract description 73
- 230000005494 condensation Effects 0.000 claims abstract description 33
- 238000009833 condensation Methods 0.000 claims abstract description 33
- 230000001105 regulatory effect Effects 0.000 claims description 100
- 238000010438 heat treatment Methods 0.000 claims description 22
- 230000001276 controlling effect Effects 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 9
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
Abstract
The invention discloses a heat pump system with variable flow single-stage compression cycle and cascade cycle, and aims to provide a system with high efficiency and low initial investment. The exhaust end of the compressor in the refrigeration compressor unit is connected with a first interface of the four-way reversing valve, the air suction end of the compressor is connected with a third interface of the four-way reversing valve, a second interface of the four-way reversing valve is connected in parallel and then is divided into a second interface and a third interface, and a fourth interface of the four-way reversing valve is connected in parallel and then is divided into a first interface and a fourth interface. The first interface of the refrigeration compressor unit is connected with the functional four-way reversing valve through the indoor unit and the first throttle valve, the second interface of the refrigeration compressor unit is connected with the condensation evaporator, the third interface of the refrigeration compressor unit is connected with the functional four-way reversing valve through the outdoor unit, and the refrigeration compressor unit is connected with the condensation evaporator; the functional four-way reversing valve is connected with the condensing evaporator through the second throttle valve, and the condensing evaporator is connected with a first interface of the functional four-way reversing valve.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to a heat pump system capable of realizing variable flow single-stage compression cycle and cascade cycle.
Background
With the increase of environmental protection pressure, the country greatly promotes the coal to electricity products. The air source heat pump is widely used due to the characteristics of energy conservation and environmental protection.
Overlapping heat pump systems are a good solution when it is desired to obtain heat transfer from a lower temperature to a higher temperature. Heat is absorbed from a low-temperature heat source through the low-temperature-level heat pump system, transferred to a condensing evaporator connected with the low-temperature-level heat pump system and the high-temperature-level heat pump system, and transferred to a high-temperature environment through the high-temperature-level heat pump system. The traditional cascade heat pump system is generally composed of two working media, wherein a high-temperature working medium is adopted by a high-temperature-level heat pump system, and a low-temperature working medium is adopted by a low-temperature-level heat pump system. However, since the low-temperature working medium is in a supercritical state at normal temperature, an expansion container is usually arranged at a low-temperature level, and the system is complex and is not suitable for an air source heat pump system which needs heating in winter and cooling in summer.
However, in the case of cooling in summer, whether a two-stage compression cycle heat pump or an cascade cycle heat pump, if the cooling capacity is set to be far greater than the cooling load of a building in summer according to a region capable of satisfying the outdoor temperature heating load of-25 ℃. In other words, the air source heat pump in the areas is mainly set with winter heat load, and summer cold load is not as large as the cold supply output by the actual air source heat pump, more than half of cold is wasted during operation, the operation cost of users is high, and the initial investment is large.
Disclosure of Invention
The invention aims at solving the technical defects in the prior art and provides a heat pump system capable of realizing variable flow single-stage compression cycle and cascade cycle so as to improve the efficiency of the system and reduce the initial investment of the system.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a heat pump system with variable flow single-stage compression cycle and cascade cycle comprises a refrigeration compressor unit, a condensation evaporator, a functional four-way reversing valve, an outdoor unit, an indoor unit, a first throttle valve and a second throttle valve; the refrigerating compressor unit comprises a plurality of compressors and four-way regulating reversing valves, the number of the four-way regulating reversing valves is the same as that of the compressors, the exhaust end of each compressor is connected with a first interface of the corresponding four-way regulating reversing valve, the air suction end of each compressor is connected with a third interface of the four-way regulating reversing valve, the second interfaces of the four-way regulating reversing valves are connected in parallel and then are divided into a second interface and a third interface of the refrigerating compressor unit, and the fourth interfaces of the four-way regulating reversing valve are connected in parallel and then are divided into a first interface and a fourth interface of the refrigerating compressor unit; adjusting valves are respectively arranged between the second interfaces and the fourth interfaces of the adjacent adjusting four-way reversing valves; the regulating valves corresponding to the suction end and the discharge end of the same compressor are simultaneously opened or simultaneously closed; the first interface of the refrigeration compressor unit is connected with the fourth interface of the functional four-way reversing valve through the indoor unit and the first throttle valve, the second interface of the refrigeration compressor unit is connected with the first interface of the condensation evaporator, the third interface of the refrigeration compressor unit is connected with the third interface of the functional four-way reversing valve through the outdoor unit, and the fourth interface of the refrigeration compressor unit is connected with the second interface of the condensation evaporator; the second interface of the functional four-way reversing valve is connected with the third interface of the condensing evaporator through the second throttling valve, and the fourth interface of the condensing evaporator is connected with the first interface of the functional four-way reversing valve.
When the single-stage compression parallel circulation cooling operation is performed in summer, all the regulating valves in the refrigerating compressor unit are opened, the first interface and the second interface of the regulating four-way reversing valve are communicated, the third interface and the fourth interface of the functional four-way reversing valve are communicated, and the first interface and the second interface of the functional four-way reversing valve are communicated; part of working medium is compressed and then enters the outdoor unit through the third interface of the regulating four-way reversing valve and the refrigerating compressor unit to be condensed, the condensed working medium enters the indoor unit through the functional four-way reversing valve and the first throttle valve to be evaporated, refrigeration is generated, and then the working medium returns to the compressor of the refrigerating compressor unit through the first interface of the refrigerating compressor unit and the regulating four-way reversing valve; after the other part of working medium is compressed, the working medium enters the condensation evaporator through the four-way regulating reversing valve and the second interface of the refrigeration compressor unit, and the working medium coming out of the condensation evaporator returns to the compressor of the refrigeration compressor unit through the four-way regulating reversing valve, the second throttling valve, the condensation evaporator, the fourth interface of the refrigeration compressor unit and the four-way regulating reversing valve to complete single-stage refrigeration cycle; the energy adjustment of the stage is realized by controlling the start-stop quantity of the compressors in the refrigerating compressor unit, the second throttle valve is used as a hot gas bypass valve, and the opening degree of the second throttle valve is adjusted to realize stepless energy adjustment.
When the refrigeration compressor operates in cascade circulation in summer, a first interface of an adjusting four-way reversing valve in the refrigeration compressor unit is communicated with a second interface, and a third interface of the adjusting four-way reversing valve is communicated with a fourth interface; the first interface of the functional four-way reversing valve is communicated with the fourth interface, and the second interface of the functional four-way reversing valve is communicated with the third interface; the compressor close to the third interface of the refrigeration compressor unit is used as a high-temperature-stage system compressor, and the compressor close to the second interface of the refrigeration compressor unit is used as a low-temperature-stage system compressor; the air suction ends of the high-temperature-stage system compressors are communicated with each other, the air discharge ends of the low-temperature-stage system compressors are communicated with each other, and the low-temperature-stage system compressors are not communicated with the air discharge ends and the air suction ends of the high-temperature-stage system compressors; the high-temperature-stage system compressor compresses working media, then the working media enter the outdoor unit through the four-way regulating reversing valve and the third interface of the refrigerating compressor unit to be condensed, the condensed working media enter the condensing evaporator through the four-way functional reversing valve and the second throttling valve to be evaporated, the condensation heat of a low-temperature stage is absorbed, and the working media return to the high-temperature-stage system compressor of the refrigerating compressor unit through the fourth interface of the refrigerating compressor unit and the four-way regulating reversing valve to complete high-temperature-stage circulation; the low-temperature-stage system compressor compresses working media, then enters the condensing evaporator through the second interface of the regulating four-way reversing valve and the refrigerating compressor unit to be condensed, dissipates heat to a high temperature stage, and the condensed working media enter the indoor unit through the functional four-way reversing valve and the first throttle valve to be evaporated, so that refrigeration phenomenon is generated, and then returns to the low-temperature-stage system compressor of the refrigerating compressor unit through the first interface of the refrigerating compressor unit and the regulating four-way reversing valve to complete low-temperature-stage circulation; the high-low temperature level variable flow rate regulation is realized by controlling the start and stop of a compressor in the refrigerating compressor unit and the start and stop of a group of regulating valves corresponding to the suction end and the exhaust end of the same compressor.
When the refrigerating compressor is operated in a single-stage compression parallel circulation heating mode in winter, all the regulating valves in the refrigerating compressor unit are opened, the first port of the regulating four-way reversing valve is communicated with the fourth port, the second port of the regulating four-way reversing valve is communicated with the third port, the first port of the functional four-way reversing valve is communicated with the second port, and the third port of the functional four-way reversing valve is communicated with the fourth port; part of working medium is compressed and then enters the indoor unit through the first interface of the regulating four-way reversing valve and the refrigerating compressor unit to be condensed to generate a heating phenomenon, the condensed working medium enters the outdoor unit through the first throttle valve and the functional four-way reversing valve to be evaporated, and outdoor environment heat is absorbed, and then returns to the compressor of the refrigerating compressor unit through the third interface of the refrigerating compressor unit and the regulating four-way reversing valve; simultaneously, the other part of working medium enters the condenser evaporator through the fourth interface of the regulating four-way reversing valve and the refrigerating compressor unit, and then returns to the compressor of the refrigerating compressor unit through the second throttle valve, the functional four-way reversing valve, the condensing evaporator and the second interface of the refrigerating compressor unit and the regulating four-way reversing valve to complete single-stage heating cycle; the energy adjustment of the stage is realized by controlling the start-stop quantity of the compressors in the refrigerating compressor unit, the second throttle valve is used as a hot gas bypass valve, and the opening degree of the second throttle valve is adjusted to realize stepless energy adjustment.
When the refrigerating compressor is operated in a cascade cycle heating mode in winter, a third interface of the four-way reversing valve in the refrigerating compressor unit is communicated with the second interface, and a first interface of the four-way reversing valve is communicated with the fourth interface; the first interface of the functional four-way reversing valve is communicated with the fourth interface, and the second interface of the functional four-way reversing valve is communicated with the third interface; the compressor close to the second interface of the refrigeration compressor unit is used as a high-temperature-stage system compressor, and the compressor close to the third interface of the refrigeration compressor unit is used as a low-temperature-stage system compressor; the air suction ends of the high-temperature-stage system compressors are communicated with each other, the air discharge ends of the low-temperature-stage system compressors are communicated with each other, and the low-temperature-stage system compressors are not communicated with the air discharge ends and the air suction ends of the high-temperature-stage system compressors; the low-temperature-stage system compressor compresses working media, then enters the condensing evaporator through the fourth interface of the regulating four-way reversing valve and the refrigerating compressor unit to be condensed, dissipates heat to a high temperature stage, and the condensed working media enter the outdoor unit through the second throttle valve and the functional four-way reversing valve to be evaporated, absorbs outdoor environment heat, and returns to the low-temperature-stage system compressor of the refrigerating compressor unit through the third interface of the refrigerating compressor unit and the regulating four-way reversing valve to complete low-temperature-stage circulation; the high-temperature-stage system compressor compresses working media, then the working media enter the indoor unit through a first interface of the regulating four-way reversing valve and the refrigerating compressor unit to be condensed to generate a heating phenomenon, the condensed working media enter the condensing evaporator to be evaporated through a throttling valve and a functional four-way reversing valve, the condensing heat of a low-temperature stage is absorbed, and the working media return to the high-temperature-stage system compressor of the refrigerating compressor unit through a second interface of the refrigerating compressor unit and the regulating four-way reversing valve to complete high-temperature-stage circulation; the high-low temperature level variable flow rate regulation is realized by controlling the start and stop of a compressor in the refrigerating compressor unit and the start and stop of a group of regulating valves corresponding to the suction end and the exhaust end of the same compressor.
The compressor in the refrigeration compressor unit is any one of a scroll compressor, a rotor compressor, a screw compressor and a piston compressor.
The condensing evaporator is a plate heat exchanger or a double-pipe heat exchanger.
The first throttle valve and the second throttle valve are electronic expansion valves, thermal expansion valves, capillary tubes or orifice plate throttle devices.
Compared with the prior art, the invention has the beneficial effects that:
1. the heat pump system can realize single-stage compression circulation and cascade circulation in winter heating and summer cooling through reasonable design, and has flexible system switching and convenient use. When the system is designed, the system can ensure that the cooling requirement in summer and the heating requirement in winter are met, so as to save the running cost of the system, reduce the initial investment of the system,
2. the heat pump system provided by the invention has the advantages that through reasonable design, when the heat pump system is used as a single-stage compression parallel heat pump system to operate, the compressors in the refrigeration compressor unit can realize polar adjustment of energy through start-stop control, and the stepless adjustment of energy can be realized through the opening adjustment of the second throttle valve. When the system is used as an overlapping heat pump system to operate, the compressors in the refrigerating compressor unit can control the number of the high-temperature-level refrigerating compressors and the low-temperature-level refrigerating compressors to be put into operation and the interstage proportion through the opening and closing of the regulating valves, so that the interstage energy regulation is convenient, the flow ratio of working media of the high-temperature-level refrigerating system and the low-temperature-level refrigerating system is reasonable, the small temperature difference fluctuation control of the refrigerating and heat pump systems can be realized, the effective regulation of the refrigerating capacity or the heating capacity of the system can be realized, and the energy regulation is flexible.
3. When the outdoor temperature is lower than-25 ℃ in winter heating, the heating efficiency of the cascade heat pump system is higher than that of the two-stage compression heat pump system.
4. When the system of the invention is used as a cascade refrigeration system, the system consists of a single working medium, does not need devices such as an expansion container and the like, and has simple structure.
5. In the refrigerating compressor unit, each compressor is respectively connected with the four-way reversing valve, the service life of the whole unit is longer, the four-way reversing valve respectively connected with each compressor cannot cause the shutdown of the whole unit after being damaged, and the four-way reversing valve respectively connected with each compressor has smaller specification, low price and easy replacement.
Drawings
FIG. 1 is a schematic diagram of a variable flow single stage compression cycle and cascade cycle heat pump system of the present invention;
fig. 2 is a schematic view showing the structure of the refrigeration compressor unit of the present invention.
Detailed Description
The invention will be described in detail below with reference to the drawings and the specific embodiments.
The invention relates to a heat pump system with variable flow single-stage compression cycle and cascade cycle, which is shown in figures 1-2, and comprises a refrigeration compressor unit 1, a condensation evaporator 3, a functional four-way reversing valve 2, an outdoor unit 5, an indoor unit 6, a first throttle valve 4-1 and a second throttle valve 4-2. In this embodiment, the refrigeration compressor unit 1 includes a plurality of compressors 7 and four-way regulating reversing valves 9 the number of which is the same as that of the compressors, an exhaust end of each compressor 7 is connected with a first interface of the corresponding four-way regulating reversing valve 9, an air suction end of each compressor 7 is connected with a third interface of the four-way regulating reversing valve 9, a second interface of each four-way regulating reversing valve 9 is connected in parallel and then is divided into a second interface 1-2 and a third interface 1-3 of the refrigeration compressor unit, and a fourth interface of the four-way regulating reversing valve 9 is connected in parallel and then is divided into a first interface 1-1 and a fourth interface 1-4 of the refrigeration compressor unit. And regulating valves 8 are respectively arranged between the second interfaces and the fourth interfaces of the adjacent regulating four-way reversing valves 9. The regulating valves 8 corresponding to the suction end and the discharge end of the same compressor are simultaneously opened or simultaneously closed. The first interface 1-1 of the refrigeration compressor unit 1 is connected with the fourth interface of the functional four-way reversing valve 2 through the indoor unit 6 and the first throttle valve 4-1, the second interface 1-2 of the refrigeration compressor unit 1 is connected with the first interface of the condensation evaporator 3, the third interface 1-3 of the refrigeration compressor unit 1 is connected with the third interface of the functional four-way reversing valve 2 through the outdoor unit 5, and the fourth interface 1-4 of the refrigeration compressor unit 1 is connected with the second interface of the condensation evaporator 3. The second port of the functional four-way reversing valve 2 is connected with the third port of the condensation evaporator 3 through the second throttle valve 4-2, and the fourth port of the condensation evaporator 3 is connected with the first port of the functional four-way reversing valve 2.
The heat pump system can realize single-stage compression refrigeration cycle, cascade refrigeration cycle, single-stage compression heat pump cycle and cascade heat pump cycle through the switching of the regulating valve, the functional four-way reversing valve and the regulating four-way reversing valve.
When the single-stage compression parallel circulation cooling operation is performed in summer, the regulating valves 8 in the refrigeration compressor unit 1 are all opened, the first interface and the second interface of the regulating four-way reversing valve 9 are communicated, the third interface and the fourth interface of the functional four-way reversing valve 2 are communicated, and the first interface and the second interface of the functional four-way reversing valve 2 are communicated. And after being compressed, a part of working medium enters the outdoor unit 5 through the regulating four-way reversing valve 9 and the third interface 1-3 of the refrigerating compressor unit to be condensed, the condensed working medium enters the indoor unit 6 through the functional four-way reversing valve 2 and the first throttle valve 4-1 to be evaporated, so that a refrigerating phenomenon is generated, and then the working medium returns to the compressor of the refrigerating compressor unit through the first interface 1-1 of the refrigerating compressor unit and the regulating four-way reversing valve 9. And after the other part of working medium is compressed, the working medium enters the condensation evaporator 3 through the four-way regulating reversing valve 9 and the second interface 1-2 of the refrigeration compressor unit, and the working medium coming out of the condensation evaporator 3 returns to the compressor of the refrigeration compressor unit through the four-way regulating reversing valve 2, the second throttling valve 4-2, the condensation evaporator 3, the fourth interface 1-4 of the refrigeration compressor unit and the four-way regulating reversing valve 9 to complete single-stage refrigeration cycle. The energy adjustment of the stage is realized by controlling the start-stop quantity of the compressors in the refrigeration compressor unit 1, the second throttle valve is used as a hot gas bypass valve, and the opening degree of the second throttle valve is adjusted to realize stepless energy adjustment.
When the refrigeration compressor works in cascade circulation in summer, a first interface of the four-way reversing valve 9 in the refrigeration compressor unit 1 is communicated with a second interface, and a third interface of the four-way reversing valve 9 is communicated with a fourth interface; the first interface of the functional four-way reversing valve 2 is communicated with the fourth interface, and the second interface of the functional four-way reversing valve 2 is communicated with the third interface. And the compressor close to the third interface 1-3 of the refrigeration compressor unit is used as a high-temperature-stage system compressor, and the compressor close to the second interface 1-2 of the refrigeration compressor unit is used as a low-temperature-stage system compressor. The air suction ends and the air discharge ends of the high-temperature-stage system compressors are mutually communicated, the air suction ends and the air discharge ends of the low-temperature-stage system compressors are mutually communicated, the low-temperature-stage-system compressors and the air discharge ends of the high-temperature-stage-system compressors are not mutually communicated, and the air suction ends are not mutually communicated. The high-temperature-stage system compressor compresses working media, the working media enter the outdoor unit 5 for condensation through the four-way regulating reversing valve 9 and the third port 1-3 of the refrigerating compressor unit, the condensed working media enter the condensation evaporator 3 for evaporation through the four-way functional reversing valve 2 and the second throttling valve 4-2, the condensation heat of a low-temperature stage is absorbed, and the working media return to the high-temperature-stage system compressor of the refrigerating compressor unit through the fourth port 1-4 of the refrigerating compressor unit and the four-way regulating reversing valve 9, so that the high-temperature-stage circulation is completed. The low-temperature-stage system compressor compresses working media, then enters the condensation evaporator 3 through the adjusting four-way reversing valve 9 and the second interface 1-2 of the refrigerating compressor unit to be condensed, dissipates heat to a high temperature stage, and the condensed working media enter the indoor unit through the functional four-way reversing valve 9 and the first throttle valve 4-1 to be evaporated to generate refrigeration, and then returns to the low-temperature-stage system compressor of the refrigerating compressor unit through the first interface 1-1 of the refrigerating compressor unit and the adjusting four-way reversing valve 9 to complete low-temperature-stage circulation. The high-low temperature level variable flow rate regulation is realized by controlling the start and stop of a compressor in the refrigerating compressor unit and the start and stop of a group of regulating valves corresponding to the suction end and the exhaust end of the same compressor.
When the refrigerating compressor is operated by single-stage compression parallel circulation heating in winter, the regulating valve 8 in the refrigerating compressor unit 1 is fully opened, the first port of the regulating four-way reversing valve 9 is communicated with the fourth port, the second port of the regulating four-way reversing valve 9 is communicated with the third port, the first port of the functional four-way reversing valve 2 is communicated with the second port, and the third port of the functional four-way reversing valve 2 is communicated with the fourth port. And after being compressed, a part of working medium enters the indoor unit 6 through the regulating four-way reversing valve 9 and the first interface 1-1 of the refrigerating compressor unit to be condensed, a heating phenomenon is generated, the condensed working medium enters the outdoor unit 5 through the first throttle valve 4-1 and the functional four-way reversing valve 2 to be evaporated, the heat of the outdoor environment is absorbed, and the condensed working medium returns to the compressor of the refrigerating compressor unit through the third interface 1-3 of the refrigerating compressor unit and the regulating four-way reversing valve 9. Meanwhile, the other part of working medium enters the condenser evaporator 3 through the four-way regulating reversing valve 9 and the fourth interface 1-4 of the refrigerating compressor unit, and then returns to the compressor of the refrigerating compressor unit 1 through the second throttle valve 4-2, the functional four-way reversing valve 2, the condensing evaporator 3 and the second interface 1-2 of the refrigerating compressor unit, and the four-way regulating reversing valve 9 to complete single-stage heating cycle. The energy adjustment of the stage is realized by controlling the start-stop quantity of the compressors in the refrigeration compressor unit 1, the second throttle valve is used as a hot gas bypass valve, and the opening degree of the second throttle valve is adjusted to realize stepless energy adjustment.
When the refrigerating compressor unit is operated in a cascade cycle heating mode in winter, a third interface of the four-way regulating reversing valve 9 in the refrigerating compressor unit 1 is communicated with a second interface, and a first interface of the four-way regulating reversing valve 9 is communicated with a fourth interface; the first interface of the functional four-way reversing valve 2 is communicated with the fourth interface, and the second interface of the functional four-way reversing valve 2 is communicated with the third interface. And the compressor close to the second interface 1-2 of the refrigeration compressor unit is used as a high-temperature-stage system compressor, and the compressor close to the third interface 1-3 of the refrigeration compressor unit is used as a low-temperature-stage system compressor. The air suction ends and the air discharge ends of the high-temperature-level system compressors are mutually communicated, the air suction ends and the air discharge ends of the low-temperature-level system compressors are mutually communicated, and the air discharge ends and the air suction ends of the low-temperature-level system compressors and the high-temperature-level system compressors are not mutually communicated. The low-temperature-stage system compressor compresses working media, then enters the condensing evaporator 3 through the four-way regulating reversing valve 9 and the fourth interface 1-4 of the refrigerating compressor unit to be condensed, dissipates heat to a high temperature stage, and the condensed working media enter the outdoor unit 5 through the second throttling valve 4-2 and the functional four-way reversing valve 2 to be evaporated, absorb outdoor environment heat, and then returns to the low-temperature-stage system compressor of the refrigerating compressor unit 1 through the third interface 1-3 of the refrigerating compressor unit and the four-way regulating reversing valve 9 to complete low-temperature-stage circulation. The high-temperature-stage system compressor compresses working media, then enters the indoor unit 6 for condensation through the four-way regulating reversing valve 9 and the first interface 1-1 of the refrigerating compressor unit to generate a heating phenomenon, the condensed working media enter the condensation evaporator 3 for evaporation through the first throttling valve 4-1 and the functional four-way reversing valve 2 to absorb condensation heat of a low-temperature stage, and then returns to the high-temperature-stage system compressor of the refrigerating compressor unit 1 through the second interface 1-2 of the refrigerating compressor unit and the four-way regulating reversing valve 9 to complete high-temperature-stage circulation. The high-low temperature level variable flow rate regulation is realized by controlling the start and stop of a compressor in the refrigerating compressor unit and the start and stop of a group of regulating valves corresponding to the suction end and the exhaust end of the same compressor.
The compressor 7 in the refrigeration compressor unit 1 is any one of a scroll compressor, a rotor compressor, a screw compressor and a piston compressor.
The condensing evaporator 3 is a plate heat exchanger or a double pipe heat exchanger.
The first throttle valve 4-1 and the second throttle valve 4-2 are electronic expansion valves, thermal expansion valves, capillary tubes or orifice plate throttle devices.
The variable flow single-stage compression parallel heat pump system and the variable flow cascade heat pump system can be switched through actions of the functional four-way reversing valve, the regulating four-way reversing valve and the regulating valve in the refrigerating compressor unit, and in the variable flow single-stage compression parallel heat pump system, stepless regulation of energy is realized by controlling the start-stop number of the compressors in the refrigerating compressor unit. In the cascade system, the flow change and interstage matching of the high-low temperature level system can be realized by controlling the opening and closing of the regulating valves in groups.
When the variable flow single-stage compression parallel and cascade heat pump system is particularly used, the refrigeration compressor can partially or completely adopt a fixed-frequency refrigeration compressor so as to reduce investment.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. The heat pump system with variable flow single-stage compression cycle and cascade cycle is characterized by comprising a refrigeration compressor unit, a condensation evaporator, a functional four-way reversing valve, an outdoor unit, an indoor unit, a first throttle valve and a second throttle valve; the refrigerating compressor unit comprises a plurality of compressors and four-way regulating reversing valves, the number of the four-way regulating reversing valves is the same as that of the compressors, the exhaust end of each compressor is connected with a first interface of the corresponding four-way regulating reversing valve, the air suction end of each compressor is connected with a third interface of the four-way regulating reversing valve, the second interfaces of the four-way regulating reversing valves are connected in parallel and then are divided into a second interface and a third interface of the refrigerating compressor unit, and the fourth interfaces of the four-way regulating reversing valve are connected in parallel and then are divided into a first interface and a fourth interface of the refrigerating compressor unit; adjusting valves are respectively arranged between the second interfaces and the fourth interfaces of the adjacent adjusting four-way reversing valves; the regulating valves corresponding to the suction end and the discharge end of the same compressor are simultaneously opened or simultaneously closed; the first interface of the refrigeration compressor unit is connected with the fourth interface of the functional four-way reversing valve through the indoor unit and the first throttle valve, the second interface of the refrigeration compressor unit is connected with the first interface of the condensation evaporator, the third interface of the refrigeration compressor unit is connected with the third interface of the functional four-way reversing valve through the outdoor unit, and the fourth interface of the refrigeration compressor unit is connected with the second interface of the condensation evaporator; the second port of the functional four-way reversing valve is connected with the third port of the condensing evaporator through the second throttling valve, and the fourth port of the condensing evaporator is connected with the first port of the functional four-way reversing valve; when the single-stage compression parallel circulation cooling operation is performed in summer, all the regulating valves in the refrigerating compressor unit are opened, the first interface and the second interface of the regulating four-way reversing valve are communicated, the third interface and the fourth interface of the functional four-way reversing valve are communicated, and the first interface and the second interface of the functional four-way reversing valve are communicated; part of working medium is compressed and then enters the outdoor unit through the third interface of the regulating four-way reversing valve and the refrigerating compressor unit to be condensed, the condensed working medium enters the indoor unit through the functional four-way reversing valve and the first throttle valve to be evaporated, refrigeration is generated, and then the working medium returns to the compressor of the refrigerating compressor unit through the first interface of the refrigerating compressor unit and the regulating four-way reversing valve; after the other part of working medium is compressed, the working medium enters the condensation evaporator through the four-way regulating reversing valve and the second interface of the refrigeration compressor unit, and the working medium coming out of the condensation evaporator returns to the compressor of the refrigeration compressor unit through the four-way regulating reversing valve, the second throttling valve, the condensation evaporator, the fourth interface of the refrigeration compressor unit and the four-way regulating reversing valve to complete single-stage refrigeration cycle; the energy adjustment of the stage is realized by controlling the start-stop quantity of the compressors in the refrigerating compressor unit; when the refrigeration compressor operates in cascade circulation in summer, a first interface of an adjusting four-way reversing valve in the refrigeration compressor unit is communicated with a second interface, and a third interface of the adjusting four-way reversing valve is communicated with a fourth interface; the first interface of the functional four-way reversing valve is communicated with the fourth interface, and the second interface of the functional four-way reversing valve is communicated with the third interface; the compressor close to the third interface of the refrigeration compressor unit is used as a high-temperature-stage system compressor, and the compressor close to the second interface of the refrigeration compressor unit is used as a low-temperature-stage system compressor; the air suction ends of the high-temperature-stage system compressors are communicated with each other, the air discharge ends of the low-temperature-stage system compressors are communicated with each other, and the low-temperature-stage system compressors are not communicated with the air discharge ends and the air suction ends of the high-temperature-stage system compressors; the high-temperature-stage system compressor compresses working media, then the working media enter the outdoor unit through the four-way regulating reversing valve and the third interface of the refrigerating compressor unit to be condensed, the condensed working media enter the condensing evaporator through the four-way functional reversing valve and the second throttling valve to be evaporated, the condensation heat of a low-temperature stage is absorbed, and the working media return to the high-temperature-stage system compressor of the refrigerating compressor unit through the fourth interface of the refrigerating compressor unit and the four-way regulating reversing valve to complete high-temperature-stage circulation; the low-temperature-stage system compressor compresses working media, then enters the condensing evaporator through the second interface of the regulating four-way reversing valve and the refrigerating compressor unit to be condensed, dissipates heat to a high temperature stage, and the condensed working media enter the indoor unit through the functional four-way reversing valve and the first throttle valve to be evaporated, so that refrigeration phenomenon is generated, and then returns to the low-temperature-stage system compressor of the refrigerating compressor unit through the first interface of the refrigerating compressor unit and the regulating four-way reversing valve to complete low-temperature-stage circulation; the high-low temperature level variable flow rate regulation is realized by controlling the start and stop of a compressor in the refrigerating compressor unit and the start and stop of a group of regulating valves corresponding to the suction end and the exhaust end of the same compressor.
2. The variable flow single stage compression cycle and cascade cycle heat pump system of claim 1 wherein during operation with single stage compression parallel cycle heating in winter, the regulating valves in the refrigeration compressor unit are all open, the first port of the regulating four-way reversing valve is in communication with the fourth port, the second port of the regulating four-way reversing valve is in communication with the third port, the first port of the functional four-way reversing valve is in communication with the second port, and the third port of the functional four-way reversing valve is in communication with the fourth port; part of working medium is compressed and then enters the indoor unit through the first interface of the regulating four-way reversing valve and the refrigerating compressor unit to be condensed to generate a heating phenomenon, the condensed working medium enters the outdoor unit through the first throttle valve and the functional four-way reversing valve to be evaporated, and outdoor environment heat is absorbed, and then returns to the compressor of the refrigerating compressor unit through the third interface of the refrigerating compressor unit and the regulating four-way reversing valve; simultaneously, the other part of working medium enters the condensation evaporator through the fourth interface of the regulating four-way reversing valve and the refrigerating compressor unit, and then returns to the compressor of the refrigerating compressor unit through the second throttle valve, the functional four-way reversing valve, the condensation evaporator and the second interface of the refrigerating compressor unit, and the regulating four-way reversing valve, so that single-stage heating cycle is completed; the energy adjustment of the stage is realized by controlling the start-stop quantity of the compressors in the refrigerating compressor unit, the second throttle valve is used as a hot gas bypass valve, and the opening degree of the second throttle valve is adjusted to realize stepless energy adjustment.
3. The variable flow single stage compression cycle and cascade cycle heat pump system of claim 1, wherein a second port of an adjusting four-way reversing valve in the refrigeration compressor unit is communicated with a third port and a first port of the adjusting four-way reversing valve is communicated with a fourth port during heating operation in cascade cycle in winter; the first interface of the functional four-way reversing valve is communicated with the fourth interface, and the second interface of the functional four-way reversing valve is communicated with the third interface; the compressor close to the second interface of the refrigeration compressor unit is used as a high-temperature-stage system compressor, and the compressor close to the third interface of the refrigeration compressor unit is used as a low-temperature-stage system compressor; the air suction ends of the high-temperature-stage system compressors are communicated with each other, the air discharge ends of the low-temperature-stage system compressors are communicated with each other, and the low-temperature-stage system compressors are not communicated with the air discharge ends and the air suction ends of the high-temperature-stage system compressors; the low-temperature-stage system compressor compresses working media, then enters the condensing evaporator through the fourth interface of the regulating four-way reversing valve and the refrigerating compressor unit to be condensed, dissipates heat to a high temperature stage, and the condensed working media enter the outdoor unit through the second throttle valve and the functional four-way reversing valve to be evaporated, absorbs outdoor environment heat, and returns to the low-temperature-stage system compressor of the refrigerating compressor unit through the third interface of the refrigerating compressor unit and the regulating four-way reversing valve to complete low-temperature-stage circulation; the high-temperature-stage system compressor compresses working media, then the working media enter the indoor unit through a first interface of the regulating four-way reversing valve and the refrigerating compressor unit to be condensed to generate a heating phenomenon, the condensed working media enter the condensing evaporator to be evaporated through a throttling valve and a functional four-way reversing valve, the condensing heat of a low-temperature stage is absorbed, and the working media return to the high-temperature-stage system compressor of the refrigerating compressor unit through a second interface of the refrigerating compressor unit and the regulating four-way reversing valve to complete high-temperature-stage circulation; the high-low temperature level variable flow rate regulation is realized by controlling the start and stop of a compressor in the refrigerating compressor unit and the start and stop of a group of regulating valves corresponding to the suction end and the exhaust end of the same compressor.
4. A variable flow single stage compression cycle and cascade cycle heat pump system as in any of claims 1-3 wherein the compressor in the refrigeration compressor train is any of a scroll compressor, a rotor compressor, a screw compressor, and a piston compressor.
5. A variable flow single stage compression cycle and cascade cycle heat pump system as in any one of claims 1-3 wherein the condensing evaporator is a plate heat exchanger or a double pipe heat exchanger.
6. A variable flow single stage compression cycle and cascade cycle heat pump system as claimed in any one of claims 1 to 3 wherein the first and second throttles are electronic expansion valves, thermal expansion valves, capillary or orifice plate throttles.
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| CN103335440A (en) * | 2013-07-04 | 2013-10-02 | 天津商业大学 | Secondary throttling middle complete cooling double-working-condition refrigeration system |
| CN205690729U (en) * | 2016-05-03 | 2016-11-16 | 天津商业大学 | Variable-flow either simplex matter heat exchangers in parallel overlapping heat pump |
| CN107514830A (en) * | 2016-06-18 | 2017-12-26 | 上海春至新能源科技有限公司 | A kind of single multi-stage compression automatic conversion Multifunctional heat pump system |
| CN208222889U (en) * | 2018-03-21 | 2018-12-11 | 天津商业大学 | The refrigeration system of variable-flow single stage compress circulation and two-stage compression cycle can be achieved |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335440A (en) * | 2013-07-04 | 2013-10-02 | 天津商业大学 | Secondary throttling middle complete cooling double-working-condition refrigeration system |
| CN205690729U (en) * | 2016-05-03 | 2016-11-16 | 天津商业大学 | Variable-flow either simplex matter heat exchangers in parallel overlapping heat pump |
| CN107514830A (en) * | 2016-06-18 | 2017-12-26 | 上海春至新能源科技有限公司 | A kind of single multi-stage compression automatic conversion Multifunctional heat pump system |
| CN208222889U (en) * | 2018-03-21 | 2018-12-11 | 天津商业大学 | The refrigeration system of variable-flow single stage compress circulation and two-stage compression cycle can be achieved |
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