CN112432377A - Air conditioning system, control method thereof and heat pump air conditioner - Google Patents
Air conditioning system, control method thereof and heat pump air conditioner Download PDFInfo
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- CN112432377A CN112432377A CN202011379673.4A CN202011379673A CN112432377A CN 112432377 A CN112432377 A CN 112432377A CN 202011379673 A CN202011379673 A CN 202011379673A CN 112432377 A CN112432377 A CN 112432377A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000007246 mechanism Effects 0.000 claims abstract description 66
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 238000005057 refrigeration Methods 0.000 claims abstract description 19
- 238000004891 communication Methods 0.000 claims description 170
- 230000002265 prevention Effects 0.000 claims description 12
- 230000005494 condensation Effects 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims 1
- 239000003507 refrigerant Substances 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000010257 thawing Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02732—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using two three-way valves
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2106—Temperatures of fresh outdoor air
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides an air conditioning system, a control method thereof and a heat pump air conditioner. The air conditioning system comprises a compressor, a four-way valve, an indoor heat exchanger, a first outdoor heat exchanger and a second outdoor heat exchanger, wherein a first throttling mechanism is arranged on a first pipeline, and a second throttling mechanism is arranged on a second pipeline. According to the air conditioning system, the control method thereof and the heat pump air conditioner, the two outdoor heat exchangers are arranged, and the frosting of the outdoor heat exchangers is inhibited at the cost of little capacity loss during low-temperature heating operation through the two throttling mechanisms and the two short-circuit branches, so that the continuity of heating operation is realized, the indoor temperature fluctuation is reduced, and the use comfort of a user is improved; when the high-temperature refrigeration running is carried out, the outdoor side heat exchange effect is enhanced, the high pressure of the refrigerant is reduced, the maximum upper limit of the external environment temperature of the whole machine running is further improved, and therefore the running adaptability of the unit is improved.
Description
Technical Field
The invention relates to the technical field of air treatment equipment, in particular to an air conditioning system, a control method thereof and a heat pump air conditioner.
Background
The existing heat pump type air conditioner generally has the problems that an external machine is frosted when the external machine is operated at low ambient temperature for heating, and the external machine is limited to start up under high pressure or is operated for protection and shutdown when the external machine is operated at high ambient temperature for cooling. The method is to carry out refrigerant switching defrosting or hot gas bypass defrosting to frosting problem common practice at present, and whichever kind of mode is defrosted and is leaded to the fluctuation of indoor temperature and acutely influences the travelling comfort that the user used, and to refrigerate under the high ambient temperature, mainly use development novel refrigerant now as the main, the degree of difficulty is big and economic benefits is poor.
Disclosure of Invention
In order to solve the technical problems of low-temperature heating frosting and high-ambient-temperature refrigeration high-pressure limitation starting or stopping protection of a heat pump type air conditioner in the prior art, the air conditioner system capable of preventing frosting during low-temperature heating operation and avoiding stopping protection during high-ambient-temperature operation, the control method thereof and the heat pump air conditioner are provided.
An air conditioning system comprising:
a compressor;
a D communication port of the four-way valve is communicated with an exhaust port of the compressor, and an S communication port of the four-way valve is communicated with an air suction port of the compressor;
the indoor heat exchanger is communicated with an E communication port of the four-way valve;
the first outdoor heat exchanger is communicated with the indoor heat exchanger through a first pipeline;
the second outdoor heat exchanger is communicated with the first outdoor heat exchanger through a second pipeline and is communicated with a C communication port of the four-way valve;
a first throttling mechanism is arranged on the first pipeline, and a first short-circuit branch is arranged between the first end of the first throttling mechanism and the second end of the first throttling mechanism;
and a second throttling mechanism is arranged on the second pipeline, and a second short circuit branch is arranged between the first end of the second throttling mechanism and the second end of the first throttling mechanism.
The air conditioning system further comprises a first three-way valve, wherein an a communication port of the first three-way valve is communicated with the indoor heat exchanger, a b communication port of the first three-way valve is communicated with the first throttling mechanism, a c communication port of the first three-way valve is communicated with the first outdoor heat exchanger, the first three-way valve is provided with a first state that the a communication port is communicated with the b communication port and a second state that the a communication port is communicated with the c communication port, and a pipeline communicated with the first outdoor heat exchanger of the c communication port of the first three-way valve forms the first short-circuit branch.
The air conditioning system further comprises a second three-way valve, an a communication port of the second three-way valve is communicated with the second outdoor heat exchanger, a b communication port of the second three-way valve is communicated with the second throttling mechanism, a c communication port of the second three-way valve is communicated with the first outdoor heat exchanger, the second three-way valve is provided with a third state that the a communication port is communicated with the b communication port and a fourth state that the a communication port is communicated with the c communication port, and a pipeline communicated with the first outdoor heat exchanger and the c communication port of the second three-way valve form the second short-circuit branch.
The air conditioning system further comprises an outdoor fan, and the outdoor fan blows air from the first outdoor heat exchanger to the second outdoor heat exchanger.
A control method of the air conditioning system described above, the air conditioning system further including a first three-way valve and a second three-way valve, the a communication port of the first three-way valve being communicated with the indoor heat exchanger, the b communication port of the first three-way valve being communicated with the first throttling mechanism, the c communication port of the first three-way valve being communicated with the first outdoor heat exchanger, and the first three-way valve having a first state in which the a communication port is communicated with the b communication port and a second state in which the a communication port is communicated with the c communication port, the c communication port of the first three-way valve and a pipeline communicated with the first outdoor heat exchanger constituting the first short-circuit branch, the a communication port of the second three-way valve being communicated with the second outdoor heat exchanger, the b communication port of the second three-way valve being communicated with the second throttling mechanism, the c communication port of the second three-way valve being communicated with the first outdoor heat exchanger, and the second three-way valve has a third state that the communication port a is communicated with the communication port b and a fourth state that the communication port a is communicated with the communication port c, and a pipeline of the communication port c of the second three-way valve and the first outdoor heat exchanger form the second short-circuit branch, and the control method comprises the following steps:
in the heating mode, the four-way valve is switched to a communication port D to be communicated with a communication port E, the first three-way valve is switched to a first state, the second three-way valve is switched to a fourth state, the first throttling mechanism is switched to an open state, and the second throttling mechanism is switched to a closed state;
in the heating anti-frosting mode, the four-way valve is switched to a communication port D to be communicated with a communication port E, the first three-way valve is switched to a second state, the second three-way valve is switched to a fourth state, the first throttling mechanism is switched to a closed state, and the second throttling mechanism is switched to an open state;
in the refrigeration mode, the four-way valve is switched to a communication port D to be communicated with a communication port C, the first three-way valve is switched to a first state, the second three-way valve is switched to a fourth state, the first throttling mechanism is switched to an open state, and the second throttling mechanism is switched to a closed state;
and in the refrigeration high-pressure prevention mode, the four-way valve is switched to the communication port D to be communicated with the communication port C, the first three-way valve is switched to the second state, the second three-way valve is switched to the third state, the first throttling mechanism is switched to the closed state, and the second throttling mechanism is switched to the open state.
The control method further comprises the following steps:
setting a first temperature preset value Ts and a second temperature preset value Td;
acquiring the evaporating temperature T1 of the second outdoor heat exchanger and the ambient temperature T2 of an air conditioning system, and respectively comparing T1 with Ts and T2 with Td;
when T1 < Ts and T2 < Td, the air conditioning system switches to a heating anti-frosting mode.
The control method further comprises the following steps:
setting a third temperature preset value Tm, and comparing T2 with Tm;
when T2 is more than or equal to Tm, the air conditioning system is switched from a heating anti-frosting mode to a heating mode;
wherein Tm-Td > 3 ℃.
The numerical range of the first temperature preset value Ts is-5 ℃ to-3 ℃; the numerical range of the second temperature preset value Td is-5 ℃ to 0 ℃; the third temperature preset value Tm has a value in the range of 0 ℃ to 5 ℃.
The control method further comprises the following steps:
setting a first pressure value Ps and a fourth temperature preset value Th;
acquiring a condensation pressure value P1 of the air conditioning system and an ambient temperature T2 of the air conditioning system, and respectively comparing P1 with Ps and T2 with Tm;
when P1 > Ps and T2 > Th, the air conditioning system is switched to a cooling high pressure prevention mode.
The control method further comprises the following steps:
setting a fifth temperature preset value Tg, and comparing T2 with Tg;
when Tg is less than or equal to T2, the air conditioning system is switched to a refrigeration mode;
wherein the Th-Tg is > 3 ℃.
The numerical range of the fourth preset temperature value Th is 48-55 ℃; the fifth temperature preset value Tg ranges from 45 ℃ to 48 ℃.
A heat pump air conditioner comprises the air conditioning system.
According to the air conditioning system, the control method thereof and the heat pump air conditioner, the two outdoor heat exchangers are arranged, and the frosting of the outdoor heat exchangers is inhibited at the cost of little capacity loss during low-temperature heating operation through the two throttling mechanisms and the two short-circuit branches, so that the continuity of heating operation is realized, the indoor temperature fluctuation is reduced, and the use comfort of a user is improved; when the high-temperature refrigeration running is carried out, the outdoor side heat exchange effect is enhanced, the high pressure of the refrigerant is reduced, the maximum upper limit of the external environment temperature of the whole machine running is further improved, and therefore the running adaptability of the unit is improved.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioning system, a control method thereof and an embodiment of a heat pump air conditioner according to the present invention;
fig. 2 is a refrigerant flow diagram of an air conditioning system, a control method thereof, and an embodiment of a heat pump air conditioner according to the present invention, in a heating mode;
fig. 3 is a refrigerant flow diagram of an air conditioning system, a control method thereof, and a heat pump air conditioner according to an embodiment of the present invention, in a heating and anti-frosting mode;
fig. 4 is a refrigerant flow diagram of the air conditioning system, the control method thereof and the heat pump air conditioner in the cooling mode according to the embodiment of the air conditioning system and the heat pump air conditioner provided by the invention;
fig. 5 is a refrigerant flow diagram of an air conditioning system, a control method thereof, and a heat pump air conditioner according to an embodiment of the present invention, in a refrigeration high pressure prevention mode;
in the figure:
1. a compressor; 2. a four-way valve; 3. an indoor heat exchanger; 4. a first outdoor heat exchanger; 5. a first pipeline; 6. a second outdoor heat exchanger; 7. a second pipeline; 8. a first throttle mechanism; 9. a first short-circuit branch; 10. a second throttling mechanism; 11. a second short-circuit branch; 12. a first three-way valve; 13. a second three-way valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The air conditioning system as shown in fig. 1 to 5 includes: a compressor 1; the four-way valve 2 is provided with an electrified state and a power-off state, the D communication port of the four-way valve 2 is communicated with the C communication port and the S communication port is communicated with the E communication port in the electrified state, and the D communication port of the four-way valve 2 is communicated with the E communication port and the S communication port is communicated with the C communication port in the power-off state; the indoor heat exchanger 3 is communicated with an E communication port of the four-way valve 2; the first outdoor heat exchanger 4 is communicated with the indoor heat exchanger 3 through a first pipeline 5; the second outdoor heat exchanger 6 is communicated with the first outdoor heat exchanger 4 through a second pipeline 7, and the second outdoor heat exchanger 6 is communicated with a C communication port of the four-way valve 2; a first throttling mechanism 8 is arranged on the first pipeline 5, and a first short-circuit branch 9 is arranged between the first end of the first throttling mechanism 8 and the second end of the first throttling mechanism 8; a second throttling mechanism 10 is arranged on the second pipeline 7, and a second short-circuit branch 11 is arranged between the first end of the second throttling mechanism 10 and the second end of the first throttling mechanism 8, wherein the first short-circuit branch 9 and the second short-circuit branch 11 can be switched to be communicated or not according to needs, when the two short-circuit branches are communicated, the corresponding throttling mechanisms can be in short circuit, when the two short-circuit branches are disconnected, the corresponding throttling mechanisms can work normally, when the two short-circuit branches are in low-temperature heating operation, the frosting of the outdoor heat exchanger is inhibited at the cost of a small amount of capacity loss, the continuity of heating operation is realized, the temperature fluctuation of the indoor side is reduced, and the comfort of users is improved; when the high-temperature refrigeration running is carried out, the outdoor side heat exchange effect is enhanced, the high pressure of the refrigerant is reduced, the maximum upper limit of the external environment temperature of the whole machine running is further improved, and therefore the running adaptability of the unit is improved.
The air conditioning system further comprises a first three-way valve 12, wherein a communication port a of the first three-way valve 12 is communicated with the indoor heat exchanger 3, a communication port b of the first three-way valve 12 is communicated with the first throttling mechanism 8, a communication port c of the first three-way valve 12 is communicated with the first outdoor heat exchanger 4, the first three-way valve 12 has a first state that the communication port a is communicated with the communication port b and a second state that the communication port a is communicated with the communication port c, the communication port c of the first three-way valve 12 and a pipeline communicated with the first outdoor heat exchanger 4 form the first short-circuit branch 9, the flow direction of a refrigerant is controlled through switching of the first three-way valve 12, and therefore on-off of the first short-circuit branch 9 is controlled.
The air conditioning system further comprises a second three-way valve 13, wherein a communication port a of the second three-way valve 13 is communicated with the second outdoor heat exchanger 6, a communication port b of the second three-way valve 13 is communicated with the second throttling mechanism 10, a communication port c of the second three-way valve 13 is communicated with the first outdoor heat exchanger 4, the second three-way valve 13 has a third state that the communication port a is communicated with the communication port b and a fourth state that the communication port a is communicated with the communication port c, the communication port c of the second three-way valve 13 and a pipeline communicated with the first outdoor heat exchanger 4 form the second short-circuit branch 11, and the flow direction of the refrigerant is controlled by switching of the second three-way valve 13, so that the on-off of the second short-circuit branch 11 is controlled.
The air conditioning system further comprises an outdoor fan, the outdoor fan blows air from the first outdoor heat exchanger 4 to the second outdoor heat exchanger 6, and when frosting is prevented, the heat of the first outdoor heat exchanger 4 is used for preventing frosting from being generated on the second outdoor heat exchanger 6.
A control method of the air conditioning system described above, the air conditioning system further including a first three-way valve 12 and a second three-way valve 13, the a communication port of the first three-way valve 12 being communicated with the indoor heat exchanger 3, the b communication port of the first three-way valve 12 being communicated with the first throttling mechanism 8, the c communication port of the first three-way valve 12 being communicated with the first outdoor heat exchanger 4, and the first three-way valve 12 having a first state in which the a communication port is communicated with the b communication port and a second state in which the a communication port is communicated with the c communication port, a pipeline in which the c communication port of the first three-way valve 12 is communicated with the first outdoor heat exchanger 4 constituting the first short circuit branch 9, the a communication port of the second three-way valve 13 being communicated with the second outdoor heat exchanger 6, the b communication port of the second three-way valve 13 being communicated with the second throttling mechanism 10, the c communication port of the second three-way valve 13 is communicated with the first outdoor heat exchanger 4, the second three-way valve 13 has a third state in which the a communication port is communicated with the b communication port and a fourth state in which the a communication port is communicated with the c communication port, and a pipeline through which the c communication port of the second three-way valve 13 is communicated with the first outdoor heat exchanger 4 constitutes the second short circuit branch 11, and the control method includes:
in the heating mode, the four-way valve 2 is switched to a communication port D to communicate with a communication port E, the first three-way valve 12 is switched to a first state, the second three-way valve 13 is switched to a fourth state, the first throttling mechanism 8 is switched to an open state, the second throttling mechanism 10 is switched to a closed state, and the exhaust gas of the compressor 1 sequentially passes through the communication port D of the four-way valve 2, the communication port E, the indoor heat exchanger 3, the communication port a of the first three-way valve 12, the communication port b of the first three-way valve 12, the first throttling mechanism 8, the first outdoor heat exchanger 4, the communication port C of the second three-way valve 13, the communication port a of the second three-way valve 13, the second outdoor heat exchanger 6, the communication port C of the four-way valve 2, and the communication port S of the four-way valve 2 and then flows back to the suction port;
in the heating frost prevention mode, the four-way valve 2 is switched to a communication port D to communicate with a communication port E, the first three-way valve 12 is switched to a second state, the second three-way valve 13 is switched to a fourth state, the first throttling mechanism 8 is switched to a closed state, the second throttling mechanism 10 is switched to an open state, the exhaust gas of the compressor 1 sequentially passes through the communication port D of the four-way valve 2, the communication port E, the indoor heat exchanger 3, a communication port a of the first three-way valve 12, a communication port C of the first three-way valve 12, the first outdoor heat exchanger 4, the second throttling mechanism 10, a communication port b of the second three-way valve 13, a communication port a of the second three-way valve 13, the second outdoor heat exchanger 6, the communication port C of the four-way valve 2 and the communication port S of the four-way valve 2 and flows back to the air suction port of the compressor 1, the heating frost prevention cycle is completed, and the first outdoor heat exchanger 4 is heated by using the, hot air is blown to the second outdoor heat exchanger 6 under the action of the fan to prevent frosting;
in the refrigeration mode, the four-way valve 2 is switched to a communication port D to communicate with a communication port C, the first three-way valve 12 is switched to the first state, the second three-way valve 13 is switched to the fourth state, the first throttling mechanism 8 is switched to the open state, the second throttling mechanism 10 is switched to the closed state, and the exhaust gas of the compressor 1 sequentially passes through the communication port D of the four-way valve 2, the communication port C, the second outdoor heat exchanger 6, the communication port a of the second three-way valve 13, the communication port C of the second three-way valve 13, the first outdoor heat exchanger 4, the first throttling mechanism 8, the communication port b of the first three-way valve 12, the communication port a of the first three-way valve 12, the indoor heat exchanger 3, the communication port E of the four-way valve 2 and the communication port S of the four-way valve 2 and then flows back to the suction;
in the refrigeration high-pressure prevention mode, the four-way valve 2 is switched to a communication port D to communicate with a communication port C, the first three-way valve 12 is switched to a second state, the second three-way valve 13 is switched to a third state, the first throttling mechanism 8 is switched to a closed state, the second throttling mechanism 10 is switched to an open state, the exhaust gas of the compressor 1 sequentially passes through the communication port D of the four-way valve 2, the communication port C, the second outdoor heat exchanger 6, the communication port a of the second three-way valve 13, the communication port b of the second three-way valve 13, the second throttling mechanism 10, the first outdoor heat exchanger 4, the communication port C of the first three-way valve 12, the communication port a of the first three-way valve 12, the indoor heat exchanger 3, the communication port E of the four-way valve 2 and the communication port S of the four-way valve 2, then flows back to the air suction port of the compressor 1 to complete refrigeration high-pressure prevention, the air conditioner is conveyed to the first outdoor heat exchanger 4, high-temperature air blown to the second outdoor heat exchanger 6 is cooled in advance, the space environment temperature of the second outdoor heat exchanger 6 is reduced, condensation heat exchange is strengthened, high-pressure is reduced, meanwhile, the refrigerant passing through the first outdoor heat exchanger 4 continuously flows into the indoor heat exchanger 3 to be refrigerated, and therefore the purpose that the air conditioner unit can still be normal when the environment temperature is too high is achieved.
The control method further comprises the following steps:
setting a first temperature preset value Ts and a second temperature preset value Td;
acquiring the evaporating temperature T1 of the second outdoor heat exchanger 6 and the ambient temperature T2 of an air conditioning system, and respectively comparing T1 with Ts and T2 with Td;
when T1 is less than Ts and T2 is less than Td, the air conditioning system is switched to a heating anti-frosting mode, when the air conditioning system is in a shutdown state, the air conditioning system is directly switched to the heating anti-frosting mode after being started, and when the air conditioning system is in the heating mode, the air conditioning system is switched to the heating anti-frosting mode from the heating mode.
The control method further comprises the following steps:
setting a third temperature preset value Tm, and comparing T2 with Tm;
when T2 is more than or equal to Tm, the air conditioning system is switched from a heating anti-frosting mode to a heating mode;
wherein Tm-Td is more than 3 ℃, and frequent switching between the heating mode and the heating anti-frosting mode of the air conditioning system caused by small fluctuation of the environmental temperature is avoided.
The numerical range of the first temperature preset value Ts is-5 ℃ to-3 ℃; the numerical range of the second temperature preset value Td is-5 ℃ to 0 ℃; the third temperature preset value Tm has a value in the range of 0 ℃ to 5 ℃.
The control method further comprises the following steps:
setting a first pressure value Ps and a fourth temperature preset value Th;
acquiring a condensation pressure value P1 of the air conditioning system and an ambient temperature T2 of the air conditioning system, and respectively comparing P1 with Ps and T2 with Tm;
when P1 is greater than Ps and T2 is greater than Th, the air conditioning system is switched to a refrigeration high-pressure prevention mode, the air conditioning system is directly switched to the refrigeration high-pressure prevention mode after being started, and when the air conditioning system is in the refrigeration mode, the air conditioning system is switched to the refrigeration high-pressure prevention mode from the refrigeration mode.
The control method further comprises the following steps:
setting a fifth temperature preset value Tg, and comparing T2 with Tg;
when Tg is less than or equal to T2, the air conditioning system is switched to a refrigeration mode;
the Th-Tg is more than 3 ℃, frequent switching between a heating mode and a heating anti-frosting mode of the air conditioning system caused by small amplitude fluctuation of the ambient temperature is avoided, Ps can be set according to the type of a refrigerant, but Ps needs to be smaller than the protection pressure of the air conditioning system.
The numerical range of the fourth preset temperature value Th is 48-55 ℃; the fifth temperature preset value Tg ranges from 45 ℃ to 48 ℃.
A heat pump air conditioner comprises the air conditioning system.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. An air conditioning system characterized by: the method comprises the following steps:
a compressor (1);
a D communication port of the four-way valve (2) is communicated with an exhaust port of the compressor (1), and an S communication port of the four-way valve (2) is communicated with an air suction port of the compressor (1);
the indoor heat exchanger (3) is communicated with an E communication port of the four-way valve (2);
the first outdoor heat exchanger (4), the first outdoor heat exchanger (4) is communicated with the indoor heat exchanger (3) through a first pipeline (5);
the second outdoor heat exchanger (6), the second outdoor heat exchanger (6) is communicated with the first outdoor heat exchanger (4) through a second pipeline (7), and the second outdoor heat exchanger (6) is communicated with a C communication port of the four-way valve (2);
a first throttling mechanism (8) is arranged on the first pipeline (5), and a first short-circuit branch (9) is arranged between the first end of the first throttling mechanism (8) and the second end of the first throttling mechanism (8);
and a second throttling mechanism (10) is arranged on the second pipeline (7), and a second short circuit branch (11) is arranged between the first end of the second throttling mechanism (10) and the second end of the first throttling mechanism (8).
2. The air conditioning system of claim 1, wherein: the air conditioning system further comprises a first three-way valve (12), wherein a communication port of the first three-way valve (12) is communicated with the indoor heat exchanger (3), a b communication port of the first three-way valve (12) is communicated with the first throttling mechanism (8), a c communication port of the first three-way valve (12) is communicated with the first outdoor heat exchanger (4), the first three-way valve (12) is provided with a first state that the a communication port is communicated with the b communication port and a second state that the a communication port is communicated with the c communication port, and a pipeline communicated with the first outdoor heat exchanger (4) of the c communication port of the first three-way valve (12) forms the first short-circuit branch (9).
3. The air conditioning system of claim 1, wherein: the air conditioning system further comprises a second three-way valve (13), wherein a communication port of the second three-way valve (13) is communicated with the second outdoor heat exchanger (6), a b communication port of the second three-way valve (13) is communicated with the second throttling mechanism (10), a c communication port of the second three-way valve (13) is communicated with the first outdoor heat exchanger (4), the second three-way valve (13) is provided with a third state that the a communication port is communicated with the b communication port and a fourth state that the a communication port is communicated with the c communication port, and a pipeline communicated with the first outdoor heat exchanger (4) and the c communication port of the second three-way valve (13) form the second short-circuit branch (11).
4. The air conditioning system of claim 1, wherein: the air conditioning system further comprises an outdoor fan which blows gas from the first outdoor heat exchanger (4) towards the second outdoor heat exchanger (6).
5. A control method of an air conditioning system according to any one of claims 1 to 4, characterized in that: the air conditioning system further comprises a first three-way valve (12) and a second three-way valve (13), wherein a communication port a of the first three-way valve (12) is communicated with the indoor heat exchanger (3), a b communication port of the first three-way valve (12) is communicated with the first throttling mechanism (8), a c communication port of the first three-way valve (12) is communicated with the first outdoor heat exchanger (4), the first three-way valve (12) has a first state that the a communication port is communicated with the b communication port and a second state that the a communication port is communicated with the c communication port, a pipeline communicated with the first outdoor heat exchanger (4) and a c communication port of the first three-way valve (12) forms the first short-circuit branch (9), the a communication port of the second three-way valve (13) is communicated with the second outdoor heat exchanger (6), and the b communication port of the second three-way valve (13) is communicated with the second throttling mechanism (10), a c communication port of the second three-way valve (13) is communicated with the first outdoor heat exchanger (4), the second three-way valve (13) has a third state that an a communication port is communicated with the b communication port and a fourth state that the a communication port is communicated with the c communication port, and a pipeline of the c communication port of the second three-way valve (13) communicated with the first outdoor heat exchanger (4) forms the second short-circuit branch (11), and the control method comprises the following steps:
in the heating mode, the four-way valve (2) is switched to a communication port D to be communicated with a communication port E, the first three-way valve (12) is switched to a first state, the second three-way valve (13) is switched to a fourth state, the first throttling mechanism (8) is switched to an open state, and the second throttling mechanism (10) is switched to a closed state;
the heating anti-frosting mode is characterized in that the four-way valve (2) is switched to a communication port D to be communicated with a communication port E, the first three-way valve (12) is switched to a second state, the second three-way valve (13) is switched to a fourth state, the first throttling mechanism (8) is switched to a closed state, and the second throttling mechanism (10) is switched to an open state;
the four-way valve (2) is switched to a communication port D to be communicated with a communication port C, the first three-way valve (12) is switched to a first state, the second three-way valve (13) is switched to a fourth state, the first throttling mechanism (8) is switched to an open state, and the second throttling mechanism (10) is switched to a closed state;
and in a refrigeration high-pressure prevention mode, the four-way valve (2) is switched to a communication port D to be communicated with a communication port C, the first three-way valve (12) is switched to a second state, the second three-way valve (13) is switched to a third state, the first throttling mechanism (8) is switched to a closed state, and the second throttling mechanism (10) is switched to an open state.
6. The control method according to claim 5, characterized in that: the control method further comprises the following steps:
setting a first temperature preset value Ts and a second temperature preset value Td;
acquiring the evaporation temperature T1 of the second outdoor heat exchanger (6) and the ambient temperature T2 of an air conditioning system, and respectively comparing T1 with Ts and T2 with Td;
when T1 < Ts and T2 < Td, the air conditioning system switches to a heating anti-frosting mode.
7. The control method according to claim 6, characterized in that: the control method further comprises the following steps:
setting a third temperature preset value Tm, and comparing T2 with Tm;
when T2 is more than or equal to Tm, the air conditioning system is switched from a heating anti-frosting mode to a heating mode;
wherein Tm-Td > 3 ℃.
8. The control method according to claim 7, characterized in that: the numerical range of the first temperature preset value Ts is-5 ℃ to-3 ℃; the numerical range of the second temperature preset value Td is-5 ℃ to 0 ℃; the third temperature preset value Tm has a value in the range of 0 ℃ to 5 ℃.
9. The control method according to claim 5, characterized in that: the control method further comprises the following steps:
setting a first pressure value Ps and a fourth temperature preset value Th;
acquiring a condensation pressure value P1 of the air conditioning system and an ambient temperature T2 of the air conditioning system, and respectively comparing P1 with Ps and T2 with Tm;
when P1 > Ps and T2 > Th, the air conditioning system is switched to a cooling high pressure prevention mode.
10. The control method according to claim 9, characterized in that: the control method further comprises the following steps:
setting a fifth temperature preset value Tg, and comparing T2 with Tg;
when Tg is less than or equal to T2, the air conditioning system is switched to a refrigeration mode;
wherein the Th-Tg is > 3 ℃.
11. The control method according to claim 10, characterized in that: the numerical range of the fourth preset temperature value Th is 48-55 ℃; the fifth temperature preset value Tg ranges from 45 ℃ to 48 ℃.
12. A heat pump air conditioner is characterized in that: comprising an air conditioning system according to any of claims 1 to 4.
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| CN202011379673.4A CN112432377A (en) | 2020-11-30 | 2020-11-30 | Air conditioning system, control method thereof and heat pump air conditioner |
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| CN202011379673.4A CN112432377A (en) | 2020-11-30 | 2020-11-30 | Air conditioning system, control method thereof and heat pump air conditioner |
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