CN108253654B - Heat pump system capable of realizing variable flow single-stage circulation and double-stage circulation - Google Patents
Heat pump system capable of realizing variable flow single-stage circulation and double-stage circulation Download PDFInfo
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- CN108253654B CN108253654B CN201810234520.7A CN201810234520A CN108253654B CN 108253654 B CN108253654 B CN 108253654B CN 201810234520 A CN201810234520 A CN 201810234520A CN 108253654 B CN108253654 B CN 108253654B
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- 238000005057 refrigeration Methods 0.000 claims abstract description 156
- 230000001105 regulatory effect Effects 0.000 claims abstract description 23
- 230000006835 compression Effects 0.000 claims description 70
- 238000007906 compression Methods 0.000 claims description 70
- 238000001816 cooling Methods 0.000 claims description 28
- 230000001276 controlling effect Effects 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 22
- 230000007613 environmental effect Effects 0.000 claims description 7
- 238000001704 evaporation Methods 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 3
- 239000003507 refrigerant Substances 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 2
- 238000000034 method Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004134 energy conservation Methods 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
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001502 supplementing effect 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses a heat pump system capable of realizing variable flow single-stage circulation and double-stage circulation, and aims to provide a system which is convenient to switch and low in initial investment. The system comprises a refrigeration compressor unit, a first four-way reversing valve, a second four-way reversing valve, a third four-way reversing valve, an intercooler, an outdoor unit, an indoor unit, a first throttle valve, a second throttle valve, a first valve, a second valve, a third valve and a fourth valve. The first exhaust interface of the refrigerating compressor unit is connected with the fourth interface of the second four-way reversing valve through the second valve, the first air suction interface of the refrigerating compressor unit is connected with the second interface of the second four-way reversing valve, the second exhaust interface of the refrigerating compressor unit is connected with the second interface of the third four-way reversing valve through the fourth valve, and the second air suction interface of the refrigerating compressor unit is connected with the fourth interface of the third four-way reversing valve. The system realizes the switching through the opening and closing of the regulating valve and the interface conversion of the four-way reversing valve, improves the refrigerating capacity in summer and has low operation cost.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a heat pump system capable of realizing variable flow single-stage parallel circulation and double-stage circulation.
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. In order to adapt to low-temperature environment in winter, a two-stage compressed circulating air source heat pump is adopted to improve the system efficiency, and heating can be realized at the outdoor temperature of minus 25 ℃.
The existing two-stage compression heat pump system comprises a single machine head and a plurality of machine heads, the two-stage compression is generally realized by adopting an intermediate air supplementing mode in the single machine head, and at the moment, the compression volume ratio of the high-pressure stage compressor to the low-pressure stage compressor is generally fixed to be 1:3 or 1:2. As the evaporating pressure of the heat pump system varies with the outdoor environment temperature, the intermediate pressure of the system and the cylinder volume ratio of the high-pressure stage compressor to the low-pressure stage compressor also vary continuously, which is uneconomical for the designed high-pressure and low-pressure cylinder volume ratio. The existing multi-head mode can ensure proper compression ratio and proper cylinder volume ratio by using frequency conversion technology, but has higher cost and fixed compression mode, when cooling in summer, for a two-stage compression heat pump system, if the design meeting the outdoor temperature heating heat load requirement of minus 25 ℃, in other words, the air source heat pump in the areas is mainly set with winter heat load, the high-pressure compressor and the low-pressure compressor can not be used simultaneously when cooling in summer, more than half of compressors are idle when running, the running cost is high, and the initial investment of the system is large.
Disclosure of Invention
The invention aims at overcoming the technical defects in the prior art, and provides a heat pump system which can switch between a single-stage compression cycle and a double-stage compression cycle according to the refrigerating capacity requirement, has adjustable refrigerant flow and can reduce the running cost and initial investment of users.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a heat pump system capable of realizing variable flow single-stage circulation and double-stage circulation comprises a refrigeration compressor unit, a first four-way reversing valve, a second four-way reversing valve, a third four-way reversing valve, an intercooler, an outdoor unit, an indoor unit, a first throttle valve, a second throttle valve, a first valve, a second valve, a third valve and a fourth valve; the first exhaust interface of the refrigeration compressor unit is connected with the fourth interface of the second four-way reversing valve through the second valve, the first suction interface of the refrigeration compressor unit is connected with the second interface of the second four-way reversing valve, the second exhaust interface of the refrigeration compressor unit is connected with the second interface of the third four-way reversing valve through the fourth valve, and the second suction interface of the refrigeration compressor unit is connected with the fourth interface of the third four-way reversing valve; the first port of the second four-way reversing valve is connected with the second port of the intercooler, the third port of the intercooler is connected with the second port of the first four-way reversing valve and the first port of the third four-way reversing valve respectively, the first port of the intercooler is connected with one end of the second throttle valve and one end of the first valve respectively through the third valve, the other end of the first valve is connected with the first port of the first four-way reversing valve, the third port of the first four-way reversing valve is connected with the fourth port of the intercooler through the first throttle valve, and the fourth port of the first four-way reversing valve is connected with the third port of the third four-way reversing valve through the outdoor unit; the other end of the second throttle valve is connected with a third interface of the second four-way reversing valve through the indoor unit.
The refrigerating compressor unit comprises a plurality of compressors, the exhaust ends of the compressors are connected in parallel and divided into a first exhaust interface and a second exhaust interface, the air suction ends of the compressors are connected in parallel and divided into a first air suction interface and a second air suction interface, and regulating valves are respectively arranged between the exhaust ends of the adjacent compressors and between the air suction ends of the adjacent compressors.
When the refrigerating compressor works in a single-stage compression refrigeration cycle in summer, all the regulating valves in the refrigerating compressor set are opened, the first valve and the fourth valve are opened, the second valve and the third valve are closed, the first interface of the first four-way reversing valve is communicated with the fourth interface, the second interface of the first four-way reversing valve is communicated with the third interface, the first interface of the second four-way reversing valve is communicated with the fourth interface, the second interface of the second four-way reversing valve is communicated with the third interface, the first interface of the third four-way reversing valve is communicated with the fourth interface, and the second interface of the third four-way reversing valve is communicated with the third interface; the compressed working medium enters the outdoor unit through a second exhaust interface, a fourth valve and a third four-way reversing valve of the refrigeration compressor unit, the condensed working medium enters the second throttling valve after passing through the first four-way reversing valve and the first valve, the throttled working medium enters the indoor unit to evaporate, refrigeration is generated, and the evaporated working medium returns to a first air suction interface of the refrigeration compressor unit through the second four-way reversing valve and returns to the refrigeration compressor unit; energy modulation is achieved by controlling the number of compressor operations in the refrigeration compressor unit.
When the two-stage compression circulation refrigeration operation is performed by using the incomplete cooling in the middle of the two-stage throttling in summer, the first valve is closed, the second valve, the third valve and the fourth valve are opened, the first interface of the first four-way reversing valve is communicated with the second interface, the third interface of the first four-way reversing valve is communicated with the fourth interface, the first interface of the second four-way reversing valve is communicated with the fourth interface, the second interface of the second four-way reversing valve is communicated with the third interface, the first interface of the third four-way reversing valve is communicated with the fourth interface, and the second interface of the third four-way reversing valve is communicated with the third interface; the compressor close to the second exhaust interface of the refrigeration compressor unit is used as a high-pressure stage compressor, and the compressor close to the first exhaust interface of the refrigeration compressor unit is used as a low-pressure stage compressor; the air suction ends of the high-pressure stage compressors are communicated with each other, the air discharge ends of the low-pressure stage compressors are communicated with each other, and the air discharge ends of the low-pressure stage compressors and the high-pressure stage compressors are not communicated with each other; the high-pressure stage compressor compresses working media, then the working media enter the outdoor unit through a second exhaust interface, a fourth valve and a third four-way reversing valve of the refrigeration compressor unit, the condensed working media enter the intercooler through the first four-way reversing valve and a first throttle valve to evaporate and absorb heat, the superheat degree of medium-pressure overheat steam is reduced, the evaporated working media enter the indoor unit through the third valve and a second throttle valve to evaporate, a refrigeration phenomenon is generated, and then the working media enter the low-pressure stage compressor of the refrigeration compressor unit through the second four-way reversing valve and a first air suction interface of the refrigeration compressor unit; the low-pressure stage compressor compresses working media, the working media enter the intercooler through a first exhaust interface, a second valve and a second four-way reversing valve of the refrigeration compressor unit to be discharged, the superheat degree is reduced, and then the working media enter the high-pressure stage compressor of the refrigeration compressor unit through a third four-way reversing valve and a second air suction interface of the refrigeration compressor unit to complete a two-stage compression cycle of incomplete cooling in the middle of secondary throttling; and the high-low pressure stage variable flow regulation is realized by controlling the start and stop of each compressor in the refrigerating compressor unit and the start and stop of a group of regulating valves corresponding to the compressors.
When the two-stage compression circulation refrigeration operation is completed in the second-stage throttling middle, the first valve, the second valve, the third valve and the fourth valve are opened, the first interface of the first four-way reversing valve is communicated with the second interface, the third interface of the first four-way reversing valve is communicated with the fourth interface, the first interface of the second four-way reversing valve is communicated with the fourth interface, the second interface of the second four-way reversing valve is communicated with the third interface, the first interface of the third four-way reversing valve is communicated with the fourth interface, and the second interface of the third four-way reversing valve is communicated with the third interface; the compressor close to the second exhaust interface of the refrigeration compressor unit is used as a high-pressure stage compressor, and the compressor close to the first exhaust interface of the refrigeration compressor unit is used as a low-pressure stage compressor; the air suction ends of the high-pressure stage compressors are communicated with each other, the air discharge ends of the low-pressure stage compressors are communicated with each other, and the air discharge ends of the low-pressure stage compressors and the high-pressure stage compressors are not communicated with each other; the high-pressure stage compressor compresses working media, then the working media enter the outdoor unit through a second exhaust interface, a fourth valve and a third four-way reversing valve of the refrigeration compressor unit, the condensed working media enter the intercooler for evaporation and heat absorption after being throttled through a first four-way reversing valve and a first throttle valve, the superheat degree of medium-pressure overheat steam is reduced, the evaporated working media are divided into two paths after passing through the third valve, one path of the evaporated working media is mixed with the overheat steam from the intercooler through the first valve and the first four-way reversing valve, the second suction interface of the refrigeration compressor unit is returned through the third four-way reversing valve, the other path of the evaporated working media enter the indoor unit for evaporation after being throttled through the second throttle valve, and the evaporated working media enter the low-pressure stage compressor of the refrigeration compressor unit through the second four-way reversing valve and the first suction interface of the refrigeration compressor unit; meanwhile, the low-pressure stage compressor compresses working media and then enters the intercooler through the second valve and the second four-way reversing valve to be discharged, so that the degree of superheat is reduced, and the discharged working media are mixed with the working media of the first four-way reversing valve and then returned to a second air suction interface of the refrigeration compressor unit through the third four-way reversing valve; and the high-low pressure stage variable flow regulation is realized by controlling the start and stop of each compressor in the refrigerating compressor unit and the start and stop of a group of regulating valves corresponding to the compressors.
When the refrigerating compressor is operated by single-stage compression circulation heating in winter, all regulating valves in the refrigerating compressor unit are opened, a first valve and a second valve are opened, a third valve and a fourth valve are closed, a first interface of the first four-way reversing valve is communicated with a fourth interface, a second interface of the first four-way reversing valve is communicated with the third interface, the first interface of the second four-way reversing valve is communicated with the second interface, a third interface of the second four-way reversing valve is communicated with the fourth interface, a third interface of the third four-way reversing valve is communicated with the fourth interface, and a second interface of the third four-way reversing valve is communicated with the first interface; after the working medium is compressed, the working medium enters the indoor unit through a first exhaust interface, a second valve and a second four-way reversing valve of the refrigeration compressor unit to be condensed to generate a heating phenomenon, the condensed working medium enters the outdoor unit through the second throttle valve, the first valve and the first four-way reversing valve to be evaporated to absorb environmental heat, and then returns to the refrigeration compressor unit through the third four-way reversing valve and a second air suction interface of the refrigeration compressor unit to complete single-stage heating circulation; energy modulation is achieved by controlling the number of compressors in the refrigeration compressor unit.
When the two-stage compression circulation heating operation is performed by incomplete cooling in the middle of the two-stage throttling in winter, the first electric valve is closed, and the second valve, the third valve and the fourth valve are opened; the first port of the first four-way reversing valve is communicated with the second port, the third port of the first four-way reversing valve is communicated with the fourth port, the first port of the second four-way reversing valve is communicated with the fourth port, the second port of the second four-way reversing valve is communicated with the third port, the first port of the third four-way reversing valve is communicated with the second port, and the third port of the third four-way reversing valve is communicated with the fourth port; the compressor close to the first exhaust interface of the refrigeration compressor unit is used as a high-pressure stage compressor, and the compressor close to the second exhaust interface of the refrigeration compressor unit is used as a low-pressure stage compressor; the air suction ends of the high-pressure stage compressors are communicated with each other, the air discharge ends of the low-pressure stage compressors are communicated with each other, and the air discharge ends of the low-pressure stage compressors and the high-pressure stage compressors are not communicated with each other; the high-pressure stage compressor compresses working media, then the working media enter the indoor unit through a first exhaust interface, a second valve and a second four-way reversing valve of the refrigeration compressor unit to be condensed to generate a heating phenomenon, the condensed working media enter the intercooler through the second throttle valve and a third valve to be evaporated and absorbed, the superheat degree of medium-pressure overheat steam is reduced, then the working media enter the outdoor unit through the first throttle valve and the first four-way reversing valve to be evaporated, the environment heat is absorbed, and the evaporated working media enter the air suction end of the low-pressure stage compressor through the third four-way reversing valve and a second air suction interface of the refrigeration compressor unit to complete high-pressure stage circulation; meanwhile, the working medium is compressed by the low-pressure stage compressor and then enters the intercooler through a fourth valve and a third four-way reversing valve to be discharged, so that the superheat degree is reduced, and then the working medium returns to the air suction end of the high-pressure stage compressor of the refrigeration compressor set through the second four-way reversing valve and a first air suction interface of the refrigeration compressor set, so that the low-pressure stage circulation is completed; and the high-low pressure stage variable flow regulation is realized by controlling the start and stop of each compressor in the refrigerating compressor unit and the start and stop of a group of regulating valves corresponding to the compressors.
When the two-stage compression circulation heating operation is completed in the middle of the second-stage throttling, the first valve, the second valve, the third valve and the fourth valve are opened, the first interface of the first four-way reversing valve is communicated with the second interface, the third interface of the first four-way reversing valve is communicated with the fourth interface, the first interface of the second four-way reversing valve is communicated with the fourth interface, the second interface of the second four-way reversing valve is communicated with the third interface, the first interface of the third four-way reversing valve is communicated with the second interface, the third interface of the third four-way reversing valve is communicated with the fourth interface, a compressor close to the first exhaust interface of the refrigerating compressor unit is used as a high-pressure stage compressor, and a compressor close to the second exhaust interface of the refrigerating compressor unit is used as a low-pressure stage compressor; the air suction ends of the high-pressure stage compressors are communicated with each other, the air discharge ends of the low-pressure stage compressors are communicated with each other, and the air discharge ends of the low-pressure stage compressors and the high-pressure stage compressors are not communicated with each other; the high-pressure stage compressor compresses working media, and then the working media enter the indoor unit through a first exhaust interface and a second four-way reversing valve of the refrigeration compressor unit to be condensed to generate a heating phenomenon, the condensed working media are throttled by the second throttle valve and then are divided into two paths, and one path of working media enter the first four-way reversing valve through the first valve; the other path of working medium enters the intercooler through the third valve to evaporate and absorb heat, the temperature of medium-pressure overheat steam is reduced, the working medium coming out of the intercooler enters the outdoor unit through the first throttle valve to evaporate and absorb environmental heat through the second throttle valve, and then enters the air suction end of the low-pressure stage compressor through the third four-way reversing valve and the second air suction interface of the refrigerating compressor unit. The low-pressure stage compressor compresses working media, mixes the working media with medium-pressure gas-liquid two-phase working media from the first four-way reversing valve through the fourth valve and the third four-way reversing valve, then enters the intercooler to release heat again until medium-pressure vapor becomes saturated vapor, and returns to the high-pressure stage compressor of the refrigeration compressor unit through the second four-way reversing valve and a first air suction interface of the refrigeration compressor unit; and the high-low pressure stage variable flow regulation is realized by controlling the start and stop of each compressor in the refrigerating compressor unit and the start and stop of a group of regulating valves corresponding to the compressors.
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 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 the switching between single-stage compression and double-stage compression through the opening and closing of the regulating valve and the interface conversion of the four-way reversing valve, is easy to adjust energy when being used as a double-stage compression heat pump system, can realize the mutual conversion of a high-pressure stage compressor and a low-pressure stage compressor, and improves the efficiency of the heat pump system. Meanwhile, when the heat pump system in summer is used as an air conditioner, all compressors can be put into use, so that the refrigerating capacity in summer is improved, the initial investment of the system is reduced, the running cost is reduced, and the purpose of energy conservation is achieved.
2. When the unit is operated as a single-stage compression parallel heat pump system, the refrigerating compressors can realize energy adjustment through start-stop control. When the unit is used as a two-stage compression heat pump system to operate, the compressors in the refrigeration compressor unit can change the number of the high-pressure stage refrigeration compressors and the low-pressure stage refrigeration compressors which are put into operation and the interstage ratio by starting and stopping and opening and closing a group of regulating valves corresponding to the suction end and the exhaust end of the compressors, so that the interstage energy regulation is convenient, the working medium flow ratio of the high-pressure stage refrigeration system and the low-pressure stage refrigeration system is reasonable, the small temperature difference fluctuation control of the refrigeration and heat pump system can be realized, and the effective regulation of the refrigerating capacity or the heating capacity of the system can be realized.
3. The variable flow single-stage compression parallel and double-stage compression heat pump system can realize single-stage compression refrigeration cycle, secondary throttling middle incomplete cooling double-stage compression refrigeration cycle, secondary throttling middle complete cooling double-stage compression refrigeration cycle, single-stage compression heat pump cycle, secondary throttling middle incomplete cooling double-stage compression heat pump cycle, secondary throttling middle complete cooling double-stage compression heat pump cycle, and the system is flexible to switch, and can be suitable for various working conditions.
Drawings
FIG. 1 is a schematic diagram of a heat pump system of the present invention capable of achieving variable flow single-stage and dual-stage cycles;
fig. 2 is a schematic diagram showing the structure of a refrigeration compressor unit.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The invention discloses a schematic diagram of a heat pump system capable of realizing variable flow single-stage circulation and double-stage circulation, which is shown in fig. 1, and comprises a refrigeration compressor unit 1, a first four-way reversing valve 2-1, a second four-way reversing valve 2-2, a third four-way reversing valve 2-3, an intercooler 3, an outdoor unit 5, an indoor unit 6, a first throttle valve 4-1, a second throttle valve 4-2, a first valve 7-1, a second valve 7-2, a third valve 7-3 and a fourth valve 7-4, wherein the refrigeration compressor unit 1 comprises a plurality of compressors 8, the exhaust ends of the compressors 8 are connected in parallel and divided into a first exhaust interface 1-2 and a second exhaust interface 1-3, the suction ends of the compressors are connected in parallel and divided into a first suction interface 1-1 and a second suction interface 1-4, and regulating valves 9 are respectively arranged between the exhaust ends of adjacent compressors 8 and between the suction ends of adjacent compressors. The regulating valves of the same compressor 8 corresponding to the discharge end and the suction end are opened or closed simultaneously. The first exhaust port 1-2 of the refrigeration compressor unit 1 is connected with the fourth port of the second four-way reversing valve 2-2 through the second valve 7-2, the first air suction port 1-1 of the refrigeration compressor unit is connected with the second port of the second four-way reversing valve 2-2, the second exhaust port 1-3 of the refrigeration compressor unit is connected with the second port of the third four-way reversing valve 2-3 through the fourth valve 7-4, and the second air suction port 1-4 of the refrigeration compressor unit is connected with the fourth port of the third four-way reversing valve 2-3. The first port of the second four-way reversing valve 2-2 is connected with the second port of the intercooler 3, the third port of the intercooler 3 is connected with the second port of the first four-way reversing valve 2-1 and the first port of the third four-way reversing valve 2-3 respectively, the first port of the intercooler 3 is connected with one end of the second throttling valve 4-2 and one end of the first valve 7-1 respectively through the third valve 7-3, the other end of the first valve 7-1 is connected with the first port of the first four-way reversing valve 2-1, the third port of the first four-way reversing valve 2-1 is connected with the fourth port of the intercooler 3 through the first throttling valve 4-1, and the fourth port of the first four-way reversing valve 2-1 is connected with the third port of the third four-way reversing valve 2-3 through the outdoor unit 5; the other end of the second throttle valve 4-2 is connected with a third interface of the second four-way reversing valve 2-2 through the indoor unit 6.
The variable flow single-stage compression parallel and double-stage compression heat pump system can realize single-stage compression refrigeration cycle, secondary throttling middle incomplete cooling double-stage compression refrigeration cycle, secondary throttling middle complete cooling double-stage compression refrigeration cycle, single-stage compression heat pump cycle, secondary throttling middle incomplete cooling double-stage compression heat pump cycle, secondary throttling middle complete cooling double-stage compression heat pump cycle and flexible system switching.
When the refrigerating compressor works in a single-stage compression refrigerating cycle in summer, the regulating valves 9 in the refrigerating compressor unit 1 are all opened, the first valve 7-1 and the fourth valve 7-4 are opened, the second valve 7-2 and the third valve 7-3 are closed, the first interface of the first four-way reversing valve 2-1 is communicated with the fourth interface, the second interface of the first four-way reversing valve 2-1 is communicated with the third interface, the first interface of the second four-way reversing valve 2-2 is communicated with the fourth interface, the second interface of the second four-way reversing valve 2-2 is communicated with the third interface, the first interface of the third four-way reversing valve 2-3 is communicated with the fourth interface, and the second interface of the third four-way reversing valve 2-3 is communicated with the third interface. The compressed working medium enters the outdoor unit 5 to be condensed through the second exhaust interface 1-3, the fourth valve 7-4 and the third four-way reversing valve 2-3 of the refrigeration compressor unit 1, the condensed working medium enters the second throttling valve 4-2 after passing through the first four-way reversing valve 2-1 and the first valve 7-1, the throttled working medium enters the indoor unit 6 to be evaporated, a refrigeration phenomenon is generated, the evaporated working medium returns to the first air suction interface 1-1 of the refrigeration compressor unit through the second four-way reversing valve 2-2 and returns to the refrigeration compressor unit. During operation, energy regulation may be achieved by controlling the number of compressor operations in the refrigeration compressor unit 1.
When the two-stage compression circulation refrigeration operation is performed by incomplete cooling in the middle of the two-stage throttling in summer, the first valve 7-1 is closed, the second valve 7-2, the third valve 7-3 and the fourth valve 7-4 are opened, the first interface of the first four-way reversing valve 2-1 is communicated with the second interface, the third interface of the first four-way reversing valve 2-1 is communicated with the fourth interface, the first interface of the second four-way reversing valve 2-2 is communicated with the fourth interface, the second interface of the second four-way reversing valve 2-2 is communicated with the third interface, the first interface of the third four-way reversing valve 2-3 is communicated with the fourth interface, and the second interface of the third four-way reversing valve 2-3 is communicated with the third interface. The compressor close to the second exhaust interface 1-3 of the refrigeration compressor unit is used as a high-pressure stage compressor, and the compressor close to the first exhaust interface 1-2 of the refrigeration compressor unit is used as a low-pressure stage compressor. The air suction ends of the high-pressure stage compressors are communicated with each other, the air discharge ends of the low-pressure stage compressors are communicated with each other, and the air discharge ends of the low-pressure stage compressors and the high-pressure stage compressors are not communicated with each other. The regulating valves of the same compressor 8 corresponding to the discharge end and the suction end are opened or closed simultaneously. The high-pressure stage compressor compresses working media, the working media enter the outdoor unit 5 through the second exhaust port 1-3, the fourth valve 7-4 and the third four-way reversing valve 2-3 to be condensed, the condensed working media enter the intercooler 3 through the first four-way reversing valve 2-1 and the first throttle valve 4-1 to be evaporated and absorbed, the superheat degree of medium-pressure superheated steam is reduced, the evaporated working media enter the indoor unit 6 through the third valve 7-3 and the second throttle valve 4-2 to be evaporated, refrigeration is generated, and the working media enter the low-pressure stage compressor of the refrigeration compressor unit 1 through the second four-way reversing valve 2-2 and the first air suction port 1-2 of the refrigeration compressor unit. The low-pressure stage compressor compresses working media, the working media enter the intercooler 3 through a first exhaust interface 1-2, a second valve 7-2 and a second four-way reversing valve 2-2 of the refrigeration compressor unit to release heat and reduce the superheat degree, and then the working media enter the high-pressure stage compressor of the refrigeration compressor unit 1 through a third four-way reversing valve 2-3 and a second air suction interface 1-4 of the refrigeration compressor unit to complete two-stage compression circulation with incomplete cooling in the middle of two-stage throttling. The stepwise adjustment of the energy is achieved by controlling the number of compressor operations in the refrigeration compressor unit. The running quantity of the high-pressure stage compressor and the low-pressure stage compressor can be adjusted by controlling the start and stop of the same compressor 8 and the opening or closing of the adjusting valves of the compressor and the corresponding exhaust end and suction end in the refrigerating compressor unit, so that the system flow of the high-pressure stage and the low-pressure stage is adjusted.
When the two-stage compression circulation refrigeration operation is completed in the second-stage throttling middle, the first valve 7-1, the second valve 7-2, the third valve 7-3 and the fourth valve 7-4 are opened, the first interface of the first four-way reversing valve 2-1 is communicated with the second interface, the third interface of the first four-way reversing valve 2-1 is communicated with the fourth interface, the first interface of the second four-way reversing valve 2-2 is communicated with the fourth interface, the second interface of the second four-way reversing valve 2-2 is communicated with the third interface, the first interface of the third four-way reversing valve 2-3 is communicated with the fourth interface, and the second interface of the third four-way reversing valve 2-3 is communicated with the third interface. The compressor close to the second exhaust interface 1-3 of the refrigeration compressor unit is used as a high-pressure stage compressor, and the compressor close to the first exhaust interface 1-2 of the refrigeration compressor unit is used as a low-pressure stage compressor. The air suction ends of the high-pressure stage compressors are communicated with each other, the air discharge ends of the low-pressure stage compressors are communicated with each other, and the air discharge ends of the low-pressure stage compressors and the high-pressure stage compressors are not communicated with each other. The high-pressure stage compressor compresses working media, the working media enter the outdoor unit 5 through the second exhaust interface 1-3, the fourth valve 7-4 and the third four-way reversing valve 2-3 of the refrigeration compressor unit to be condensed, the condensed working media enter the intercooler 3 to be evaporated and absorbed heat after being throttled by the first four-way reversing valve 2-1 and the first throttle valve 4-1, the superheat degree of medium-pressure superheated steam is reduced, the evaporated working media are divided into two paths after passing through the third valve 7-3, one path of the evaporated working media is mixed with the superheated steam coming out of the intercooler 3 through the first valve 7-1, the first four-way reversing valve 2-1, and the superheated steam returns to the second suction interface 1-4 of the refrigeration compressor unit through the third four-way reversing valve 2-3. The other path enters the indoor unit 6 for evaporation after being throttled by the second throttle valve 4-2, refrigeration is generated, and the evaporated working medium enters the low-pressure stage compressor of the refrigeration compressor unit through the second four-way reversing valve 2-2 and the first air suction interface 1-1 of the refrigeration compressor unit. Meanwhile, the working medium is compressed by the low-pressure stage compressor and enters the intercooler 3 through the second valve 7-2 and the second four-way reversing valve 2-2 to release heat, so that the degree of superheat is reduced, and the working medium after heat release is mixed with the working medium of the first four-way reversing valve 2-1 and then returns to the second air suction interface 1-4 of the refrigerating compressor unit through the third four-way reversing valve 2-3. The running quantity of the high-pressure stage compressor and the low-pressure stage compressor can be adjusted by controlling the start and stop of the same compressor 8 and the opening or closing of the adjusting valves of the compressor and the corresponding exhaust end and suction end in the refrigerating compressor unit, so that the system flow of the high-pressure stage and the low-pressure stage is adjusted.
When the refrigerating compressor unit 1 runs in winter with single-stage compression circulation, the regulating valves 9 in the refrigerating compressor unit 1 are all opened, the first valve 7-1 and the second valve 7-2 are opened, the third valve 7-3 and the fourth valve 7-4 are closed, the first interface of the first four-way reversing valve 2-1 is communicated with the fourth interface, the second interface of the first four-way reversing valve 2-1 is communicated with the third interface, the first interface of the second four-way reversing valve 2-2 is communicated with the second interface, the third interface of the second four-way reversing valve 2-2 is communicated with the fourth interface, the third interface of the third four-way reversing valve 2-3 is communicated with the fourth interface, and the second interface of the third four-way reversing valve 2-3 is communicated with the first interface. After the working medium is compressed, the working medium enters the indoor unit 6 through the first exhaust interface 1-2, the second valve 7-2 and the second four-way reversing valve 2-2 of the refrigeration compressor unit to be condensed, a heating phenomenon is generated, the condensed working medium enters the outdoor unit 5 through the second throttle valve 4-2, the first valve 7-1 and the first four-way reversing valve 2-1 to be evaporated, environmental heat is absorbed, and the working medium returns to the refrigeration compressor unit through the third four-way reversing valve 2-3 and the second air suction interface 1-4 of the refrigeration compressor unit to complete single-stage heating circulation. Energy regulation is achieved by controlling the start and stop of compressors in the refrigeration compressor unit.
When the two-stage compression cycle heating operation is performed by incomplete cooling in the middle of the two-stage throttling in winter, the first valve 7-1 is closed, and the second valve 7-2, the third valve 7-3 and the fourth valve 7-4 are opened; the first interface of the first four-way reversing valve 2-1 is communicated with the second interface, the third interface of the first four-way reversing valve 2-1 is communicated with the fourth interface, the first interface of the second four-way reversing valve 2-2 is communicated with the fourth interface, the second interface of the second four-way reversing valve 2-2 is communicated with the third interface, the first interface of the third four-way reversing valve 2-3 is communicated with the second interface, and the third interface of the third four-way reversing valve 2-3 is communicated with the fourth interface. The compressor close to the first exhaust interface 1-2 of the refrigeration compressor unit is used as a high-pressure stage compressor, and the compressor close to the second exhaust interface 1-3 of the refrigeration compressor unit is used as a low-pressure stage compressor. The air suction ends of the high-pressure stage compressors are communicated with each other, the air discharge ends of the low-pressure stage compressors are communicated with each other, and the air discharge ends of the low-pressure stage compressors and the high-pressure stage compressors are not communicated with each other. The high-pressure stage compressor compresses working media, the working media enter the indoor unit 6 through a first exhaust interface 1-2, a second valve 7-2 and a second four-way reversing valve 2-2 of the refrigeration compressor unit to be condensed, a heating phenomenon is generated, the condensed working media enter the intercooler 3 through a second throttle valve 4-2 and a third valve 7-3 to be evaporated and absorbed, the superheat degree of medium-pressure superheated steam is reduced, the working media enter the outdoor unit 5 through the first throttle valve 4-1 and the first four-way reversing valve 2-1 to be evaporated, the ambient heat is absorbed, the evaporated working media enter the air suction end of the low-pressure stage compressor through the third four-way reversing valve 2-3 and a second air suction interface 1-4 of the refrigeration compressor unit, and the high-pressure stage circulation is completed. Meanwhile, the working medium is compressed by the low-pressure stage compressor and then enters the intercooler 3 through the fourth valve 7-4 and the third four-way reversing valve 2-3 to release heat, the superheat degree is reduced, and then the working medium returns to the air suction end of the high-pressure stage compressor of the refrigeration compressor set through the second four-way reversing valve 2-2 and the first air suction interface 1-1 of the refrigeration compressor set, so that the low-pressure stage circulation is completed. The running quantity of the high-pressure stage compressor and the low-pressure stage compressor can be adjusted by controlling the start and stop of the same compressor 8 and the opening or closing of the adjusting valves of the compressor and the corresponding exhaust end and suction end in the refrigerating compressor unit, so that the system flow of the high-pressure stage and the low-pressure stage is adjusted.
When the two-stage compression circulation heating operation is completed by the two-stage throttling middle, the first valve 7-1, the second valve 7-2, the third valve 7-3 and the fourth valve 7-4 are opened, the first interface of the first four-way reversing valve 2-1 is communicated with the second interface, the third interface of the first four-way reversing valve 2-1 is communicated with the fourth interface, the first interface of the second four-way reversing valve 2-2 is communicated with the fourth interface, the second interface of the second four-way reversing valve 2-2 is communicated with the third interface, the first interface of the third four-way reversing valve 2-3 is communicated with the second interface, and the third interface of the third four-way reversing valve 2-3 is communicated with the fourth interface. The compressor close to the first exhaust interface 1-2 of the refrigeration compressor unit is used as a high-pressure stage compressor, and the compressor close to the second exhaust interface 1-3 of the refrigeration compressor unit is used as a low-pressure stage compressor. The air suction ends of the high-pressure stage compressors are communicated with each other, the air discharge ends of the low-pressure stage compressors are communicated with each other, and the air discharge ends of the low-pressure stage compressors and the high-pressure stage compressors are not communicated with each other. The high-pressure stage compressor compresses working media, and then enters the indoor unit 6 through a first exhaust interface 1-2 and a second four-way reversing valve 2-2 of the refrigeration compressor unit to be condensed, a heating phenomenon is generated, the condensed working media are throttled by the second throttle valve 4-2 and then are divided into two paths, and one path of working media enters the first four-way reversing valve 2-1 through the first valve 7-1; the other path of working medium enters the intercooler 3 through the third valve 7-3 to evaporate and absorb heat, the temperature of medium-pressure overheat steam is reduced, the working medium coming out of the intercooler 3 enters the outdoor unit 5 through the first throttle valve 4-1 to evaporate through secondary throttle, absorbs environmental heat, and then enters the air suction end of the low-pressure compressor through the third four-way reversing valve 2-3 and the second air suction interface 1-4 of the refrigerating compressor unit. The low-pressure stage compressor compresses working media, mixes the working media with medium-pressure gas-liquid two-phase working media from the first four-way reversing valve 2-1 through the fourth valve 7-4 and the third four-way reversing valve 2-3, then enters the intercooler 3 to release heat again until medium-pressure vapor becomes saturated vapor, and returns to the high-pressure stage compressor of the refrigeration compressor unit through the second four-way reversing valve 2-2 and the first air suction interface 1-1 of the refrigeration compressor unit. The running quantity of the high-pressure stage compressor and the low-pressure stage compressor can be adjusted by controlling the start and stop of the same compressor 8 and the opening or closing of the adjusting valves of the compressor and the corresponding exhaust end and suction end in the refrigerating compressor unit, so that the system flow of the high-pressure stage and the low-pressure stage is adjusted.
In the invention, 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 first throttle valve and the second throttle valve are electronic expansion valves, thermal expansion valves, capillary tubes or orifice plate throttle devices.
In the variable flow single-stage compression parallel and double-stage compression heat pump system, the refrigerating compressor unit can be switched between a variable flow single-stage compression parallel refrigerating system and a variable flow double-stage compression refrigerating system through the action of the four-way reversing valve, the variable flow single-stage compression parallel heat pump system and the variable flow double-stage compression heat pump system can be switched between the variable flow secondary throttling middle incomplete cooling double-stage compression refrigerating system and the secondary throttling middle complete cooling double-stage compression refrigerating system through the action of the valve, and the variable flow secondary throttling middle incomplete cooling double-stage compression heat pump system and the secondary throttling middle complete cooling double-stage compression heat pump system can be switched through the action of the first valve. In a variable flow single-stage compression parallel system, stepless regulation of energy is realized by controlling the start-stop number of compressors in a refrigeration compressor unit. In the two-stage compression system, the flow change and interstage matching of the high-pressure stage and the low-pressure stage can be realized by controlling the start and stop of the compressor and controlling the opening and closing of the regulating electromagnetic valves in groups.
When the variable-flow single-stage compression parallel connection and double-stage compression 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 (9)
1. The heat pump system capable of realizing variable flow single-stage circulation and double-stage circulation is characterized by comprising a refrigeration compressor unit, a first four-way reversing valve, a second four-way reversing valve, a third four-way reversing valve, an intercooler, an outdoor unit, an indoor unit, a first throttle valve, a second throttle valve, a first valve, a second valve, a third valve and a fourth valve; the first exhaust interface of the refrigeration compressor unit is connected with the fourth interface of the second four-way reversing valve through the second valve, the first suction interface of the refrigeration compressor unit is connected with the second interface of the second four-way reversing valve, the second exhaust interface of the refrigeration compressor unit is connected with the second interface of the third four-way reversing valve through the fourth valve, and the second suction interface of the refrigeration compressor unit is connected with the fourth interface of the third four-way reversing valve; the first port of the second four-way reversing valve is connected with the second port of the intercooler, the third port of the intercooler is connected with the second port of the first four-way reversing valve and the first port of the third four-way reversing valve respectively, the first port of the intercooler is connected with one end of the second throttle valve and one end of the first valve respectively through the third valve, the other end of the first valve is connected with the first port of the first four-way reversing valve, the third port of the first four-way reversing valve is connected with the fourth port of the intercooler through the first throttle valve, and the fourth port of the first four-way reversing valve is connected with the third port of the third four-way reversing valve through the outdoor unit; the other end of the second throttle valve is connected with a third interface of the second four-way reversing valve through the indoor unit; the refrigerating compressor unit comprises a plurality of compressors, wherein the exhaust ends of the compressors are connected in parallel and are divided into a first exhaust interface and a second exhaust interface, the air suction ends of the compressors are connected in parallel and are divided into a first air suction interface and a second air suction interface, and regulating valves are respectively arranged between the exhaust ends of the adjacent compressors and between the air suction ends of the adjacent compressors; the method can realize single-stage compression refrigeration cycle, secondary throttling middle incomplete cooling double-stage compression refrigeration cycle, secondary throttling middle complete cooling double-stage compression refrigeration cycle, single-stage compression heat pump cycle, secondary throttling middle incomplete cooling double-stage compression heat pump cycle and secondary throttling middle complete cooling double-stage compression heat pump cycle.
2. The variable flow single-stage and two-stage cycle heat pump system according to claim 1, wherein when operating in a single-stage compression refrigeration cycle in summer, the regulating valves in the refrigeration compressor unit are all open, the first and fourth valves are open, the second and third valves are closed, the first port of the first four-way reversing valve is communicated with the fourth port, the second port of the first four-way reversing valve is communicated with the third port, the first port of the second four-way reversing valve is communicated with the fourth port, the second port of the second four-way reversing valve is communicated with the third port, the first port of the third four-way reversing valve is communicated with the fourth port, and the second port of the third four-way reversing valve is communicated with the third port; the compressed working medium enters the outdoor unit through a second exhaust interface, a fourth valve and a third four-way reversing valve of the refrigeration compressor unit, the condensed working medium enters the second throttling valve after passing through the first four-way reversing valve and the first valve, the throttled working medium enters the indoor unit to evaporate, refrigeration is generated, and the evaporated working medium returns to a first air suction interface of the refrigeration compressor unit through the second four-way reversing valve and returns to the refrigeration compressor unit; energy modulation is achieved by controlling the number of compressor operations in the refrigeration compressor unit.
3. The heat pump system capable of realizing variable flow single-stage circulation and double-stage circulation according to claim 1, wherein when the two-stage compression circulation refrigeration operation is performed with incomplete cooling in the middle of the second-stage throttling in summer, the first valve is closed, the second valve, the third valve and the fourth valve are opened, the first interface of the first four-way reversing valve is communicated with the second interface, the third interface of the first four-way reversing valve is communicated with the fourth interface, the first interface of the second four-way reversing valve is communicated with the fourth interface, the second interface of the second four-way reversing valve is communicated with the third interface, the first interface of the third four-way reversing valve is communicated with the fourth interface, and the second interface of the third four-way reversing valve is communicated with the third interface; the compressor close to the second exhaust interface of the refrigeration compressor unit is used as a high-pressure stage compressor, and the compressor close to the first exhaust interface of the refrigeration compressor unit is used as a low-pressure stage compressor; the air suction ends of the high-pressure stage compressors are communicated with each other, the air discharge ends of the low-pressure stage compressors are communicated with each other, and the air discharge ends of the low-pressure stage compressors and the high-pressure stage compressors are not communicated with each other; the high-pressure stage compressor compresses working media, then the working media enter the outdoor unit through a second exhaust interface, a fourth valve and a third four-way reversing valve of the refrigeration compressor unit, the condensed working media enter the intercooler through the first four-way reversing valve and a first throttle valve to evaporate and absorb heat, the superheat degree of medium-pressure overheat steam is reduced, the evaporated working media enter the indoor unit through the third valve and a second throttle valve to evaporate, a refrigeration phenomenon is generated, and then the working media enter the low-pressure stage compressor of the refrigeration compressor unit through the second four-way reversing valve and a first air suction interface of the refrigeration compressor unit; the low-pressure stage compressor compresses working media, the working media enter the intercooler through a first exhaust interface, a second valve and a second four-way reversing valve of the refrigeration compressor unit to be discharged, the superheat degree is reduced, and then the working media enter the high-pressure stage compressor of the refrigeration compressor unit through a third four-way reversing valve and a second air suction interface of the refrigeration compressor unit to complete a two-stage compression cycle of incomplete cooling in the middle of secondary throttling; and the high-low pressure stage variable flow regulation is realized by controlling the start and stop of each compressor in the refrigerating compressor unit and the start and stop of a group of regulating valves corresponding to the compressors.
4. The heat pump system capable of realizing variable flow single-stage circulation and double-stage circulation according to claim 1, wherein when the two-stage compression circulation refrigeration operation is completed in the middle of the two-stage throttling in summer, the first valve, the second valve, the third valve and the fourth valve are opened, the first interface of the first four-way reversing valve is communicated with the second interface, the third interface of the first four-way reversing valve is communicated with the fourth interface, the first interface of the second four-way reversing valve is communicated with the fourth interface, the second interface of the second four-way reversing valve is communicated with the third interface, the first interface of the third four-way reversing valve is communicated with the fourth interface, and the second interface of the third four-way reversing valve is communicated with the third interface; the compressor close to the second exhaust interface of the refrigeration compressor unit is used as a high-pressure stage compressor, and the compressor close to the first exhaust interface of the refrigeration compressor unit is used as a low-pressure stage compressor; the air suction ends of the high-pressure stage compressors are communicated with each other, the air discharge ends of the low-pressure stage compressors are communicated with each other, and the air discharge ends of the low-pressure stage compressors and the high-pressure stage compressors are not communicated with each other; the high-pressure stage compressor compresses working media, then the working media enter the outdoor unit through a second exhaust interface, a fourth valve and a third four-way reversing valve of the refrigeration compressor unit, the condensed working media enter the intercooler for evaporation and heat absorption after being throttled through a first four-way reversing valve and a first throttle valve, the superheat degree of medium-pressure overheat steam is reduced, the evaporated working media are divided into two paths after passing through the third valve, one path of the evaporated working media is mixed with the overheat steam from the intercooler through the first valve and the first four-way reversing valve, the second suction interface of the refrigeration compressor unit is returned through the third four-way reversing valve, the other path of the evaporated working media enter the indoor unit for evaporation after being throttled through the second throttle valve, and the evaporated working media enter the low-pressure stage compressor of the refrigeration compressor unit through the second four-way reversing valve and the first suction interface of the refrigeration compressor unit; and simultaneously, the low-pressure stage compressor compresses working media, enters the intercooler through the second valve and the second four-way reversing valve to be heated, reduces the superheat degree, mixes the heated working media with the working media of the first four-way reversing valve, returns the mixed working media to a second air suction interface of the refrigeration compressor unit through the third four-way reversing valve, and realizes high-pressure stage variable flow regulation by controlling the start and stop of each compressor in the refrigeration compressor unit and the start and stop of a group of regulating valves corresponding to the compressors.
5. The variable flow single-stage and two-stage cycle heat pump system according to claim 1, wherein when the refrigerant compressor unit is operated with single-stage compression cycle heating in winter, the regulating valves in the refrigerant compressor unit are all opened, the first valve and the second valve are opened, the third valve and the fourth valve are closed, the first port of the first four-way reversing valve is communicated with the fourth port, the second port of the first four-way reversing valve is communicated with the third port, the first port of the second four-way reversing valve is communicated with the second port, the third port of the second four-way reversing valve is communicated with the fourth port, the third port of the third four-way reversing valve is communicated with the fourth port, and the second port of the third four-way reversing valve is communicated with the first port; after the working medium is compressed, the working medium enters the indoor unit through a first exhaust interface, a second valve and a second four-way reversing valve of the refrigeration compressor unit to be condensed to generate a heating phenomenon, the condensed working medium enters the outdoor unit through the second throttle valve, the first valve and the first four-way reversing valve to be evaporated to absorb environmental heat, and then returns to the refrigeration compressor unit through the third four-way reversing valve and a second air suction interface of the refrigeration compressor unit to complete single-stage heating circulation; energy modulation is achieved by controlling the number of compressors in the refrigeration compressor unit.
6. The variable flow single-stage and two-stage cycle heat pump system of claim 1 wherein the first valve is closed and the second, third and fourth valves are opened during a winter run with a two-stage throttled intermediate incomplete cooling two-stage compression cycle heating; the first port of the first four-way reversing valve is communicated with the second port, the third port of the first four-way reversing valve is communicated with the fourth port, the first port of the second four-way reversing valve is communicated with the fourth port, the second port of the second four-way reversing valve is communicated with the third port, the first port of the third four-way reversing valve is communicated with the second port, and the third port of the third four-way reversing valve is communicated with the fourth port; the compressor close to the first exhaust interface of the refrigeration compressor unit is used as a high-pressure stage compressor, and the compressor close to the second exhaust interface of the refrigeration compressor unit is used as a low-pressure stage compressor; the air suction ends of the high-pressure stage compressors are communicated with each other, the air discharge ends of the low-pressure stage compressors are communicated with each other, and the air discharge ends of the low-pressure stage compressors and the high-pressure stage compressors are not communicated with each other; the high-pressure stage compressor compresses working media, then the working media enter the indoor unit through a first exhaust interface, a second valve and a second four-way reversing valve of the refrigeration compressor unit to be condensed to generate a heating phenomenon, the condensed working media enter the intercooler through the second throttle valve and a third valve to be evaporated and absorbed, the superheat degree of medium-pressure overheat steam is reduced, then the working media enter the outdoor unit through the first throttle valve and the first four-way reversing valve to be evaporated, the environment heat is absorbed, and the evaporated working media enter the air suction end of the low-pressure stage compressor through the third four-way reversing valve and a second air suction interface of the refrigeration compressor unit to complete high-pressure stage circulation; meanwhile, the low-pressure stage compressor compresses working media, enters the intercooler through a fourth valve and a third four-way reversing valve to be heated, reduces the superheat degree, returns to the air suction end of the high-pressure stage compressor of the refrigeration compressor unit through a first air suction interface of the second four-way reversing valve and the refrigeration compressor unit to complete low-pressure stage circulation, and realizes high-pressure stage variable flow regulation by controlling the start and stop of each compressor in the refrigeration compressor unit and the start and stop of a group of regulating valves corresponding to the compressors.
7. The heat pump system capable of realizing variable flow single-stage circulation and double-stage circulation according to claim 1, wherein when the system is operated by fully cooling double-stage compression circulation in the middle of a second-stage throttling in winter, a first valve, a second valve, a third valve and a fourth valve are opened, a first port of a first four-way reversing valve is communicated with the second port, a third port of the first four-way reversing valve is communicated with the fourth port, a first port of the second four-way reversing valve is communicated with the fourth port, a second port of the second four-way reversing valve is communicated with the third port, a third port of the third four-way reversing valve is communicated with the fourth port, a compressor close to a first exhaust port of the refrigeration compressor unit is used as a high-pressure stage compressor, and a compressor close to a second exhaust port of the refrigeration compressor unit is used as a low-pressure stage compressor; the air suction ends of the high-pressure stage compressors are communicated with each other, the air discharge ends of the low-pressure stage compressors are communicated with each other, and the air discharge ends of the low-pressure stage compressors and the high-pressure stage compressors are not communicated with each other; the high-pressure stage compressor compresses working media, then the working media enter the indoor unit through a first exhaust interface and a second four-way reversing valve of the refrigeration compressor unit to be condensed to generate a heating phenomenon, the condensed working media are throttled through the second throttle valve and then are divided into two paths, one path of working media enter the first four-way reversing valve through the first valve, the other path of working media enter the intercooler through the third valve to be evaporated and absorbed, the temperature of medium-pressure overheat vapor is reduced, the working media from the intercooler enter the outdoor unit through the second throttle valve to be evaporated, the environment heat is absorbed, the working media enter the air suction end of the low-pressure stage compressor through the third four-way reversing valve and a second air suction interface of the refrigeration compressor unit, the low-pressure stage compressor compresses the working media, then the medium-pressure gas-liquid two-phase working media from the fourth valve and the first four-way reversing valve are mixed and then enter the intercooler to be released again until the medium-pressure overheat vapor becomes saturated vapor, and the medium-pressure overheat vapor returns to the air suction end of the high-pressure compressor unit through the second throttle valve and the first air suction interface of the first four-way reversing valve; and the high-low pressure stage variable flow regulation is realized by controlling the start and stop of each compressor in the refrigerating compressor unit and the start and stop of a group of regulating valves corresponding to the compressors.
8. The variable flow single and dual stage cycle heat pump system of claim 1 wherein the compressor in the refrigeration compressor train is any one of a scroll compressor, a rotor compressor, a screw compressor, and a piston compressor.
9. The variable flow single and dual stage cycle heat pump system of claim 1 wherein the first and second throttles are electronic expansion valves, thermal expansion valves, capillary tubes or orifice plate throttles.
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| CN108716785B (en) * | 2018-07-20 | 2023-09-26 | 天津商业大学 | Primary throttling intermediate full cooling refrigeration system with intermediate temperature evaporator |
| CN111249814B (en) * | 2020-02-26 | 2020-11-24 | 乐清市凡山电器有限公司 | Energy-concerving and environment-protective high-rise building haze administers purifier in succession |
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