CN111076445A - Air conditioning system and operation method thereof - Google Patents
Air conditioning system and operation method thereof Download PDFInfo
- Publication number
- CN111076445A CN111076445A CN201811222965.XA CN201811222965A CN111076445A CN 111076445 A CN111076445 A CN 111076445A CN 201811222965 A CN201811222965 A CN 201811222965A CN 111076445 A CN111076445 A CN 111076445A
- Authority
- CN
- China
- Prior art keywords
- mode
- air conditioning
- conditioning system
- interface
- heat exchanger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
- F25B41/31—Expansion valves
-
- 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention provides an air conditioning system and an operation method thereof. And the two four-way reversing valves in the two circulating pipelines work in the first conduction mode simultaneously, so that the air conditioning system operates in the double-refrigeration mode. And the two four-way reversing valves in the two circulating pipelines are simultaneously switched to the second conduction mode, so that the air conditioning system operates in the double heating mode. The air conditioning system is operated in a heating and defrosting mode by alternately switching two four-way reversing valves in two circulating pipelines between a first conduction mode and a second conduction mode; the circulating pipeline of the four-way reversing valve working in the first conduction mode is in a defrosting mode, and the circulating pipeline of the four-way reversing valve working in the second conduction mode is in a heating mode, so that defrosting without shutdown is realized when the air conditioning system runs in winter, and thermal comfort of the indoor side is ensured.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning system capable of defrosting without stopping and an operation method thereof.
Background
The defrosting of the existing air conditioning system generally adopts a reverse defrosting mode of a four-way reversing valve, namely, in the defrosting process, a compressor is stopped, the four-way reversing valve is switched to a refrigerating mode, the compressor is started again, an indoor fan is closed at the moment, the indoor hot air outlet operation is stopped, after the defrosting process is finished, the four-way reversing valve is switched to a heating mode, and an indoor unit recovers a hot air state.
The defrosting mode causes certain fluctuation to the indoor temperature, and during defrosting, the indoor room temperature is reduced, and the indoor thermal comfort is reduced.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present invention and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an air conditioning system and an operation method thereof, which solve the defect of low indoor thermal comfort caused by shutdown defrosting.
According to one aspect of the present invention, there is provided an air conditioning system including a compressor having two compression chambers each having a suction port and a discharge port, and two independently controlled circulation lines, the two circulation lines comprising: the first circulation pipeline comprises a first four-way reversing valve, a first interface of the first four-way reversing valve is communicated with an exhaust port of the first compression cavity, a second interface of the first four-way reversing valve is communicated with a first port of the first outdoor heat exchanger, a third interface of the first four-way reversing valve is communicated with a first port of the first indoor heat exchanger, a fourth interface of the first four-way reversing valve is communicated with an air suction port of the first compression cavity through a first liquid storage device, and a second port of the first outdoor heat exchanger is communicated with a second port of the first indoor heat exchanger through a first electronic expansion valve; the second circulation pipeline comprises a second four-way reversing valve, a first interface of the second four-way reversing valve is communicated with an exhaust port of the second compression cavity, a second interface is communicated with a first port of the second outdoor heat exchanger, a third interface is communicated with a first port of the second indoor heat exchanger, a fourth interface is communicated with an air suction port of the second compression cavity through a second liquid storage device, and a second port of the second outdoor heat exchanger is communicated with a second port of the second indoor heat exchanger through a second electronic expansion valve; when the air conditioning system operates in a first mode, the two four-way reversing valves simultaneously work in a first conduction mode, and the two electronic expansion valves simultaneously work in a partial diversion mode; when the air conditioning system operates in a second mode, the two four-way reversing valves simultaneously work in a second conduction mode, and the two electronic expansion valves simultaneously work in a partial diversion mode; when the air conditioning system operates in the third mode, one of the two four-way reversing valves works in the first conduction mode, the electronic expansion valve in the circulation pipeline works in the full diversion mode, and the other four-way reversing valve works in the second conduction mode, and the electronic expansion valve in the circulation pipeline works in the partial diversion mode; when the indoor heat exchanger works in the third mode, the conduction modes of the two four-way reversing valves are switched in turn, the first conduction mode is that the first interface is communicated with the second interface and the third interface is communicated with the fourth interface, the second conduction mode is that the first interface is communicated with the third interface and the second interface is communicated with the fourth interface, the electronic expansion valve working in the partial diversion mode controls the flow of the refrigerant flowing through the indoor heat exchanger, and the electronic expansion valve working in the full diversion mode does not control the flow of the refrigerant in the circulating pipeline.
Preferably, in the air conditioning system, the pulse for controlling the electronic expansion valve to work in the partial diversion mode is 0 to 500PPS, and the pulse for controlling the electronic expansion valve to work in the full diversion mode is 500 PPS.
Preferably, in the air conditioning system, when the air conditioning system operates in the third mode, the circulation pipeline where the four-way reversing valve in the first conduction mode is located operates in the refrigeration cycle, and the circulation pipeline where the four-way reversing valve in the second conduction mode is located operates in the heating cycle.
Preferably, in the air conditioning system, the outdoor heat exchanger in the circulation pipeline of the refrigeration cycle operates in a condensing mode for defrosting the outdoor unit, and the indoor heat exchanger is in a supercooled heat-releasing state to maintain heating of the indoor unit; the outdoor heat exchanger works in an evaporation mode and the indoor heat exchanger works in a condensation mode in the circulating pipeline of the heating cycle.
Preferably, in the air conditioning system, the conduction mode of the two four-way selector valve is switched according to the ambient temperature of the indoor heat exchanger in the circulation line of the heating cycle.
Preferably, in the air conditioning system, when the air conditioning system operates in the first mode, both the two circulation pipelines operate in a refrigeration cycle, both the two outdoor heat exchangers operate in a condensation mode, and both the two indoor heat exchangers operate in an evaporation mode.
Preferably, in the air conditioning system, the two outdoor heat exchangers operate at different condensing temperatures, and the two indoor heat exchangers operate at different evaporating temperatures; alternatively, the two outdoor heat exchangers operate at the same condensing temperature and the two indoor heat exchangers operate at the same evaporating temperature.
Preferably, in the air conditioning system, when the air conditioning system operates in the second mode, both the two circulation pipelines operate in a heating cycle, both the two outdoor heat exchangers operate in an evaporation mode, and both the two indoor heat exchangers operate in a condensation mode.
Preferably, in the air conditioning system, the two outdoor heat exchangers operate at different evaporating temperatures, and the two indoor heat exchangers operate at different condensing temperatures; alternatively, the two outdoor heat exchangers operate at the same evaporating temperature and the two indoor heat exchangers operate at the same condensing temperature.
Preferably, in the air conditioning system described above, the first indoor heat exchanger and the first electronic expansion valve are located in a first indoor unit, and the second indoor heat exchanger and the second electronic expansion valve are located in a second indoor unit.
According to another aspect of the present invention, there is provided an operation method of an air conditioning system, which is applied to the air conditioning system, the operation method including: when the air conditioning system performs double-path refrigeration, the two four-way reversing valves are controlled to simultaneously work in a first conduction mode, and the two electronic expansion valves simultaneously work in a partial diversion mode; when the air conditioning system heats in two ways, the two four-way reversing valves are controlled to work in a second conduction mode at the same time, and the two electronic expansion valves work in a partial diversion mode at the same time; when the air conditioning system heats and defrosts, one of the two four-way reversing valves is controlled to work in a first conduction mode, the electronic expansion valve in the circulation pipeline works in a full diversion mode, and the other four-way reversing valve works in a second conduction mode, and the electronic expansion valve in the circulation pipeline works in a partial diversion mode; and when heating and defrosting are carried out, the conduction modes of the two four-way reversing valves are switched according to the ambient temperature of the indoor heat exchanger in the circulating pipeline where the four-way reversing valve working in the second conduction mode is located.
Preferably, in the above operation method, the four-way reversing valve is controlled to operate in the first conduction mode by communicating the first port with the second port and communicating the third port with the fourth port; the four-way reversing valve is controlled to work in a second conduction mode by communicating the first interface with the third interface and communicating the second interface with the fourth interface; controlling the electronic expansion valve to work in a partial diversion mode by outputting 0-500 PPS pulses; and controlling the electronic expansion valve to work in a full diversion mode by continuously outputting 500PPS pulses.
Compared with the prior art, the invention has the beneficial effects that:
the air conditioning system realizes the control of two same or different suction pressures and two same or different exhaust pressures through the double-cylinder, double-suction and double-exhaust compressors; meanwhile, the control of different evaporation temperatures and different condensation temperatures is realized simultaneously through two independent circulating pipelines;
under the low-temperature working condition in winter, the two four-way reversing valves are switched in turn, so that the two circulation pipelines respectively carry out refrigeration circulation and heating circulation, the outdoor heat exchanger defrosting in turn and the indoor heat exchanger heating without stopping are realized, the indoor thermal comfort is improved, and the defrosting purpose of the outdoor heat exchanger is also met.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of the connection of an air conditioning system in an embodiment;
FIG. 2 is a schematic diagram of the refrigerant flow when the air conditioning system is operating in a heating defrost mode according to an embodiment;
FIG. 3 is a schematic diagram showing the conduction of a four-way reversing valve in a defrosting cycle line in the embodiment;
FIG. 4 is a schematic view of the four-way reversing valve in the heating circulation pipeline in the embodiment;
FIG. 5 is a schematic diagram of refrigerant flow when the air conditioning system is operating in a two-way cooling mode according to an embodiment;
fig. 6 is a schematic diagram of refrigerant flow when the air conditioning system is operating in the two-way heating mode according to an embodiment.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
Referring to fig. 1, a connection diagram of an air conditioning system, the air conditioning system of this embodiment includes a compressor 1 having two compression chambers each having an air suction port and an air discharge port, and two independently controlled circulation lines including:
a first circulation pipeline, including a first four-way reversing valve 21, a first port of which is communicated with the exhaust port of the first compression chamber 11, a second port of which is communicated with the first port of the first outdoor heat exchanger 31, a third port of which is communicated with the first port of the first indoor heat exchanger 41, a fourth port of which is communicated with the suction port of the first compression chamber 11 through a first reservoir 51, and a second port of the first outdoor heat exchanger 31 is communicated with the second port of the first indoor heat exchanger 41 through a first electronic expansion valve 61;
and the second circulation pipeline comprises a second four-way reversing valve 22, wherein a first interface of the second four-way reversing valve is communicated with the exhaust port of the second compression cavity 12, a second interface of the second four-way reversing valve is communicated with a first port of the second outdoor heat exchanger 32, a third interface of the second four-way reversing valve is communicated with a first port of the second indoor heat exchanger 42, a fourth interface of the second four-way reversing valve is communicated with a suction port of the second compression cavity 12 through a second liquid storage device 52, and a second port of the second outdoor heat exchanger 32 is communicated with a second port of the second indoor heat exchanger 42 through a second.
The first circulation pipeline and the second circulation pipeline can be independently controlled and do not affect each other, so that the air conditioning system at least has three operation modes of double-path refrigeration (the first circulation pipeline and the second circulation pipeline are both in refrigeration circulation), double-path heating (the first circulation pipeline and the second circulation pipeline are both in heating circulation), and heating defrosting (one of the first circulation pipeline and the second circulation pipeline is in heating circulation to improve the indoor environment temperature, and the other refrigeration pipeline is in outdoor heat exchanger defrosting).
When the air conditioning system operates in the first mode, i.e., the two-way cooling mode, the first four-way reversing valve 21 and the second four-way reversing valve 22 simultaneously operate in the first conduction mode, and the first electronic expansion valve 61 and the second electronic expansion valve 62 simultaneously operate in the partial diversion mode, so that both the first circulation pipeline and the second circulation pipeline operate in the cooling cycle.
When the air conditioning system operates in the second mode, i.e., the two-way heating mode, the first four-way reversing valve 21 and the second four-way reversing valve 22 simultaneously operate in the second conduction mode, and the first electronic expansion valve 61 and the second electronic expansion valve 62 simultaneously operate in the partial diversion mode, so that both the first circulation pipeline and the second circulation pipeline operate in the heating cycle.
When the air conditioning system operates in a third mode, namely a heating defrosting mode, the first four-way reversing valve 21 works in a first conduction mode, the first electronic expansion valve 61 works in a full diversion mode, meanwhile, the second four-way reversing valve 22 works in a second conduction mode, and the second electronic expansion valve 62 works in a partial diversion mode, so that the first circulation pipeline works in a refrigerating cycle, the first outdoor heat exchanger 31 condenses and defrosts, and meanwhile, the second circulation pipeline works in a heating cycle; or the second four-way reversing valve 22 works in the first conduction mode, the second electronic expansion valve 62 works in the full diversion mode, meanwhile, the first four-way reversing valve 21 works in the second conduction mode, and the first electronic expansion valve 61 works in the partial diversion mode, so that the second circulation pipeline works in the refrigeration cycle, the second outdoor heat exchanger 32 performs condensation and defrosting, and meanwhile, the first circulation pipeline works in the heating cycle.
When the defrosting device operates in the third mode, the conduction modes of the two four-way reversing valves can be switched in turn, so that defrosting of the two outdoor heat exchangers in turn is realized, meanwhile, the indoor heat exchangers do not stop to heat, indoor thermal comfort is guaranteed, low-temperature heating performance of the system is improved, and outdoor defrosting is also met.
The four-way reversing valve is characterized in that the first conduction mode is that the first interface is communicated with the second interface and the third interface is communicated with the fourth interface, and the second conduction mode is that the first interface is communicated with the third interface and the second interface is communicated with the fourth interface. The electronic expansion valve operating in the partial diversion mode controls the flow of the refrigerant flowing through the indoor heat exchanger, and the electronic expansion valve operating in the full diversion mode does not control the flow of the refrigerant in the circulating pipeline.
According to the working characteristics of an Electronic Expansion Valve (EEV), the pulse of the electronic expansion valve working in a partial diversion mode is controlled to be 0-500 PPS (pulse per second), and the pulse of the electronic expansion valve working in a full diversion mode is controlled to be 500 PPS.
Further, a dotted line frame a represents an outdoor unit group, and a dotted line frame B represents an indoor unit group. The first indoor heat exchanger 41 and the first electronic expansion valve 61 are located in the first indoor unit, and the second indoor heat exchanger 42 and the second electronic expansion valve 62 are located in the second indoor unit. Or the first indoor heat exchanger 41, the first electronic expansion valve 61, the second indoor heat exchanger 42, and the second electronic expansion valve 62 are all located in the same indoor unit. By installing the electronic expansion valve on the indoor side, it is advantageous to accurately control the flow of the refrigerant flowing into the indoor heat exchanger.
Through the double-cylinder, double-suction and double-exhaust compressor 1, two same or different suction pressures and two same or different exhaust pressure controls are simultaneously realized in the air conditioning system. The first compression cavity 11 and the second compression cavity 12 of the compressor 1 can be provided with two same or different cylinder volume ratios according to the proportion of outdoor fresh air load and indoor load, and simultaneously, the control of different evaporation temperatures and condensation temperatures between two circulation pipelines in a double-refrigeration double-heating mode is realized through two independent circulation pipelines. When the air conditioning system heats at low temperature in winter, the air conditioning system can realize the simultaneous operation of the refrigeration mode and the heating mode, so that the two outdoor heat exchangers defrost in turn, and meanwhile, the indoor heat exchangers do not stop to heat, thereby not only ensuring the indoor thermal comfort and improving the low-temperature heating performance of the system, but also realizing the outdoor defrosting.
Three operation modes (heating and defrosting, two-way cooling, two-way heating) of the air conditioning system in the embodiment will be described with reference to fig. 2 to 6. Fig. 2 to 6 respectively show the refrigerant flowing state and the conducting state of the four-way reversing valve of the air conditioning system in three operation modes, wherein solid arrows indicate the refrigerant flowing direction in the cooling mode, and dotted arrows indicate the refrigerant flowing direction in the heating mode.
In the heating and defrosting mode, one of two circulation pipelines of the air conditioning system is in a refrigerating cycle, an outdoor heat exchanger in the pipeline of the refrigerating cycle is used for defrosting, and the other circulation pipeline is in a heating cycle, and an indoor heat exchanger in the pipeline of the heating cycle is used for heating, so that the outdoor unit of the air conditioning system is defrosted in a state of not stopping for heating.
Referring to fig. 2, a first circulation line cooling cycle and a second circulation line heating cycle are taken as an example. The conduction mode of the first four-way selector valve 21 is shown in fig. 3, in which the first port 211 communicates with the second port 212, and the third port 213 communicates with the fourth port 214. In the first circulation line, the first compression chamber 11 sucks the refrigerant from the first accumulator 51, compresses the refrigerant, and discharges the compressed refrigerant; the refrigerant flows into the first outdoor heat exchanger 31 through the first connector 211 and the second connector 212 of the first four-way reversing valve 21, and the first outdoor heat exchanger 31 enters the defrosting operation; then, the refrigerant is guided by the first electronic expansion valve 61, at this time, the first electronic expansion valve 61 is in a full-flow-guiding state, so that the refrigerant completely flows into the first indoor heat exchanger 41, and the first indoor heat exchanger 41 is in a supercooling heat-releasing state; the refrigerant then flows back to the first receiver 51 communicating with the suction port of the first compression chamber 11 through the third port 213 and the fourth port 214 of the first four-way selector valve 21, thereby completing a refrigeration cycle.
The conduction mode of the second four-way selector valve 22 is shown in fig. 4, in which the first port 221 communicates with the third port 223, and the fourth port 224 communicates with the second port 222. In the second circulation line, the second compression chamber 12 sucks the refrigerant from the second accumulator 52, compresses the refrigerant, and discharges the compressed refrigerant; the refrigerant flows into the second indoor heat exchanger 42 through the first port 221 and the third port 223 of the second four-way selector valve 22, and the second indoor heat exchanger 42 maintains the heating mode, and discharges the low-temperature refrigerant after heat conversion while raising the ambient temperature by using the refrigerant; the low-temperature refrigerant is guided by the second electronic expansion valve 62 and flows into the second outdoor heat exchanger 32; the second outdoor heat exchanger 32 enters an evaporation mode, and low-temperature refrigeration heat is converted into high-temperature refrigerant to be discharged; the high-temperature refrigerant flows back to the second receiver 52 communicating with the suction port of the second compression chamber 12 through the second port 222 and the fourth port 224 of the second four-way selector valve 22, and a heating cycle is completed. Defrosting is achieved through the first circulation pipeline, and meanwhile the second circulation pipeline heats, and defrosting without stopping is achieved.
Further, the conduction mode of the two four-way reversing valves is switched according to the ambient temperature of the second indoor heat exchanger 42 in the second circulation pipeline. When the first four-way reversing valve 21 is switched from the first conduction mode to the second conduction mode, the first circulation line is switched from defrosting to heating, and simultaneously, the second four-way reversing valve 22 is switched from the second conduction mode to the first conduction mode, and the second circulation line is switched from heating to defrosting. The first outdoor heat exchanger 31 and the second outdoor heat exchanger 32 are alternately switched to a refrigeration mode by alternately switching the two four-way reversing valves, and defrosting is performed alternately; meanwhile, one of the two indoor heat exchangers maintains a heating state, so that defrosting is realized without stopping.
Referring to fig. 5, when the air conditioning system operates in the two-way cooling mode, both circulation lines operate in the cooling cycle, both outdoor heat exchangers operate in the condensing mode, and both indoor heat exchangers operate in the evaporating mode. At this time, the first four-way selector valve 21 and the second four-way selector valve 22 operate in the first conduction mode simultaneously, and both the two four-way selector valves adopt the connection mode shown in fig. 3. The first electronic expansion valve 61 and the second electronic expansion valve 62 are simultaneously operated in the partial diversion mode.
In the first circulation line, suction, compression, and discharge through the first compression chamber 11 of the compressor 1 constitute an independent refrigeration cycle. Specifically, the first compression chamber 11 sucks the refrigerant from the first accumulator 51, compresses the refrigerant, and discharges the compressed refrigerant; the refrigerant flows into the first outdoor heat exchanger 31 through the first connection port 211 and the second connection port 212 of the first four-way selector valve 21; the first outdoor heat exchanger 31 enters a condensation mode, performs heat conversion on the refrigerant to form a low-temperature refrigerant, and discharges the low-temperature refrigerant; the low-temperature refrigerant is guided by the first electronic expansion valve 61 and flows into the first indoor heat exchanger 41; the first indoor heat exchanger 41 enters an evaporation mode, reduces the ambient temperature using a low-temperature refrigerant, and discharges a high-temperature refrigerant; the high-temperature refrigerant returns to the first receiver 51 communicating with the suction port of the first compression chamber 11 through the third port 213 and the fourth port 214 of the first four-way selector valve 21, thereby completing one refrigeration cycle.
Similarly, in the second circulation line, the suction, compression, and discharge of the gas passing through the second compression chamber 11 of the compressor 1 constitute an independent refrigeration cycle. Specifically, the second compression chamber 12 sucks the refrigerant from the second accumulator 52, compresses the refrigerant, and discharges the compressed refrigerant; the refrigerant flows into the second outdoor heat exchanger 32 through the first and second ports of the second four-way reversing valve 22; the second outdoor heat exchanger 32 enters a condensation mode, and forms a low-temperature refrigerant after performing heat conversion on the refrigerant and discharges the low-temperature refrigerant; the low-temperature refrigerant flows into the second indoor heat exchanger 42 after being guided by the second electronic expansion valve 62; the second indoor heat exchanger 42 enters an evaporation mode, reduces the ambient temperature using the low-temperature refrigerant, and discharges the high-temperature refrigerant; the high-temperature refrigerant flows back to the second reservoir 52 communicated with the suction port of the second compression chamber 12 through the third port and the fourth port of the second four-way reversing valve 22, and a refrigeration cycle is completed.
The compressor 1 with double cylinders, double suction and double exhaust is adopted, so that the independent adjustment of two different suction pressures and two different exhaust pressures can be realized, and two same or different evaporation temperatures and two same or different condensation temperatures can be realized by two circulation pipelines during the simultaneous refrigeration circulation. For example, the indoor unit B is designed to have a temperature range, so that the evaporation temperature of the first indoor heat exchanger 41 is 18 °, the evaporation temperature of the second indoor heat exchanger 42 is 8 °, two different evaporation temperatures in the two-way refrigeration mode are realized, and different temperature control requirements of the ends of the two indoor units, namely the first indoor heat exchanger 41 and the second indoor heat exchanger 42, are met. Similarly, the outdoor unit A is designed with temperature division areas, and two different condensation temperatures in a two-way refrigeration mode are realized.
When the two four-way reversing valves of the air conditioning system are switched to the second conduction mode simultaneously, the two-way heating operation can be met; when the two paths of heating operation are carried out, the two indoor heat exchangers can meet two same or different condensing temperature control requirements, and the two outdoor heat exchangers can also be set to be the same or different evaporating temperatures.
Referring to fig. 6, when the air conditioning system operates in the dual heating mode, both circulation pipes operate in the heating cycle, both outdoor heat exchangers operate in the evaporation mode, and both indoor heat exchangers operate in the condensation mode. At this time, the first four-way selector valve 21 and the second four-way selector valve 22 operate in the second conduction mode simultaneously, and both the two four-way selector valves adopt the connection mode shown in fig. 4. The first electronic expansion valve 61 and the second electronic expansion valve 62 are simultaneously operated in the partial diversion mode.
In the first circulation line, the suction, compression, and discharge of the gas passing through the first compression chamber 11 of the compressor 1 constitute an independent heating cycle. Specifically, the first compression chamber 11 sucks the refrigerant from the first accumulator 51, compresses the refrigerant, and discharges the compressed refrigerant; the refrigerant flows into the first indoor heat exchanger 41 through the first connection port 211 and the third connection port 213 of the first four-way selector valve 21; the first indoor heat exchanger 41 enters a condensing mode, and discharges the low-temperature refrigerant after heat conversion while raising the ambient temperature by using the refrigerant; the low-temperature refrigerant is guided by the first electronic expansion valve 61 and flows into the first outdoor heat exchanger 31; the first outdoor heat exchanger 31 enters an evaporation mode, and converts low-temperature refrigeration heat into high-temperature refrigerant to be discharged; the high-temperature refrigerant flows back to the first receiver 51 communicating with the suction port of the first compression chamber 11 through the second port 212 and the fourth port 214 of the first four-way selector valve 21, and completes one heating cycle.
Similarly, in the second circulation line, the suction, compression, and discharge of the gas passing through the second compression chamber 12 of the compressor 1 constitute an independent heating cycle. Specifically, the second compression chamber 12 sucks the refrigerant from the second accumulator 52, compresses the refrigerant, and discharges the compressed refrigerant; the refrigerant flows into the second indoor heat exchanger 42 through the first and third ports of the second four-way selector valve 22; the second indoor heat exchanger 42 enters a condensing mode, and discharges the low-temperature refrigerant after heat conversion while raising the ambient temperature by using the refrigerant; the low-temperature refrigerant is guided by the second electronic expansion valve 62 and flows into the second outdoor heat exchanger 32; the second outdoor heat exchanger 32 enters an evaporation mode, and low-temperature refrigeration heat is converted into high-temperature refrigerant to be discharged; the high-temperature refrigerant flows back to the second accumulator 52 communicated with the suction port of the second compression chamber 12 through the second port and the fourth port of the second four-way reversing valve 22, and a heating cycle is completed.
The compressor 1 with double cylinders, double suction and double exhaust is adopted, so that the independent adjustment of two different suction pressures and two different exhaust pressures can be realized, and two same or different evaporation temperatures and two same or different condensation temperatures can be realized by two circulation pipelines during simultaneous heating circulation. Specifically, the indoor unit B is designed to have different temperature zones, so that the first indoor heat exchanger 41 and the second indoor heat exchanger 42 have different condensation temperatures, and different temperature control requirements of the two indoor unit ends are met. Similarly, the outdoor unit A is designed with temperature-division areas to realize two different evaporation temperatures.
The embodiment of the invention also provides an operation method of the air conditioning system, which is used for operating the air conditioning system described in any embodiment.
When the air conditioning system performs double-path refrigeration, the two four-way reversing valves are controlled to simultaneously work in a first conduction mode, and the two electronic expansion valves simultaneously work in a partial diversion mode.
When the air conditioning system heats in two ways, the two four-way reversing valves are controlled to work in the second conduction mode simultaneously, and the two electronic expansion valves work in the partial diversion mode simultaneously.
When the air conditioning system heats and defrosts, one of the two four-way reversing valves is controlled to work in a first conduction mode, and the electronic expansion valve in the circulating pipeline works in a full diversion mode, so that the circulating pipeline works in a refrigeration cycle; meanwhile, the other four-way reversing valve works in a second conduction mode, and the electronic expansion valve in the circulating pipeline works in a partial flow guide mode, so that the circulating pipeline works in a heating cycle.
And when heating and defrosting are carried out, the conduction modes of the two four-way reversing valves are switched according to the ambient temperature of the indoor heat exchanger in the circulating pipeline where the four-way reversing valve working in the second conduction mode is located. The four-way reversing valve is controlled to work in a first conduction mode by communicating the first interface with the second interface and communicating the third interface with the fourth interface; the four-way reversing valve is controlled to work in a second conduction mode by communicating the first interface with the third interface and communicating the second interface with the fourth interface; controlling the electronic expansion valve to work in a partial diversion mode by outputting 0-500 PPS pulses; and controlling the electronic expansion valve to work in a full diversion mode by continuously outputting 500PPS pulses.
The relevant parameters for controlling the air conditioning system to operate in different modes are summarized in the following table:
in the two-way refrigeration running mode, the air conditioning system is in a full-load state, the two four-way reversing valves are in a first conduction mode, the two electronic expansion valves are in a partial diversion mode, the two outdoor heat exchangers are in a condensation mode, and the two indoor heat exchangers are in an evaporation mode. Through different temperature regulation control, can realize the different evaporating temperature of two indoor heat exchangers, the different condensing temperature of two outdoor heat exchangers.
In the one-way refrigeration running mode, the air conditioning system is in a partial load state, and the original conduction mode of the four-way reversing valve is the first conduction mode, so that the two four-way reversing valves are both in the first conduction mode, one of the two electronic expansion valves is in a partial diversion mode, and the other electronic expansion valve is closed. The outdoor heat exchanger is in a condensing mode and the indoor heat exchanger is in an evaporating mode in a circulating pipeline where the electronic expansion valve in the partial diversion mode is located. And the outdoor heat exchanger and the indoor heat exchanger in the other circulating pipeline do not participate in operation.
Under the low-temperature defrosting mode, namely the heating defrosting mode, one of the two circulation pipelines works in the refrigeration cycle, and the outdoor heat exchanger of the two circulation pipelines carries out condensation defrosting; the other works in a heating cycle, and the indoor heat exchanger of the other works for maintaining heating. The two circulation pipelines are switched between defrosting and heating by the alternate flow switching of the two four-way reversing valves, so that the outdoor units are defrosted alternately under the low-temperature heating working condition, and the indoor units are heated without stopping.
In conclusion, the invention realizes the independent regulation of two different suction pressures and two different exhaust pressures simultaneously by the double-cylinder, double-suction and double-exhaust compressor. Through the design of the temperature division areas of the indoor heat exchanger and the outdoor heat exchanger, two independent refrigeration/heating cycles of the air conditioning system are realized, and two same or different evaporation temperatures and two same or different condensation temperatures can be simultaneously realized. When the defrosting operation is needed during low-temperature operation in winter, the air conditioning system can realize alternate defrosting of the outdoor units, and the indoor units do not stop to heat, namely, defrosting without stopping, so that the thermal comfort of the indoor side is ensured, and the low-temperature heating performance of the system is improved.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (12)
1. An air conditioning system comprising a compressor having two compression chambers each having an inlet and an outlet and two independently controlled circulation lines, the two circulation lines comprising:
the first circulation pipeline comprises a first four-way reversing valve, a first interface of the first four-way reversing valve is communicated with an exhaust port of the first compression cavity, a second interface of the first four-way reversing valve is communicated with a first port of the first outdoor heat exchanger, a third interface of the first four-way reversing valve is communicated with a first port of the first indoor heat exchanger, a fourth interface of the first four-way reversing valve is communicated with an air suction port of the first compression cavity through a first liquid storage device, and a second port of the first outdoor heat exchanger is communicated with a second port of the first indoor heat exchanger through a first electronic expansion valve;
the second circulation pipeline comprises a second four-way reversing valve, a first interface of the second four-way reversing valve is communicated with an exhaust port of the second compression cavity, a second interface is communicated with a first port of the second outdoor heat exchanger, a third interface is communicated with a first port of the second indoor heat exchanger, a fourth interface is communicated with an air suction port of the second compression cavity through a second liquid storage device, and a second port of the second outdoor heat exchanger is communicated with a second port of the second indoor heat exchanger through a second electronic expansion valve;
when the air conditioning system operates in a first mode, the two four-way reversing valves simultaneously work in a first conduction mode, and the two electronic expansion valves simultaneously work in a partial diversion mode;
when the air conditioning system operates in a second mode, the two four-way reversing valves simultaneously work in a second conduction mode, and the two electronic expansion valves simultaneously work in a partial diversion mode;
when the air conditioning system operates in the third mode, one of the two four-way reversing valves works in the first conduction mode, the electronic expansion valve in the circulation pipeline works in the full diversion mode, and the other four-way reversing valve works in the second conduction mode, and the electronic expansion valve in the circulation pipeline works in the partial diversion mode;
when the indoor heat exchanger works in the third mode, the conduction modes of the two four-way reversing valves are switched in turn, the first conduction mode is that the first interface is communicated with the second interface and the third interface is communicated with the fourth interface, the second conduction mode is that the first interface is communicated with the third interface and the second interface is communicated with the fourth interface, the electronic expansion valve working in the partial diversion mode controls the flow of the refrigerant flowing through the indoor heat exchanger, and the electronic expansion valve working in the full diversion mode does not control the flow of the refrigerant in the circulating pipeline.
2. The air conditioning system as claimed in claim 1, wherein the pulse for controlling the electronic expansion valve to operate in the partial diversion mode is 0 to 500PPS, and the pulse for controlling the electronic expansion valve to operate in the full diversion mode is 500 PPS.
3. The air conditioning system as claimed in claim 1, wherein when the air conditioning system is operated in the third mode, the circulation line of the four-way selector valve in the first conducting mode is operated in a cooling cycle, and the circulation line of the four-way selector valve in the second conducting mode is operated in a heating cycle.
4. The air conditioning system as claimed in claim 3, wherein the outdoor heat exchanger operates in a condensing mode in the circulation line of the refrigerating cycle, and the indoor heat exchanger is in a supercooled heat-releasing state; the outdoor heat exchanger works in an evaporation mode and the indoor heat exchanger works in a condensation mode in the circulating pipeline of the heating cycle.
5. The air conditioning system as claimed in claim 4, wherein the conduction mode of the two four-way selector valve is switched according to the ambient temperature of the indoor heat exchanger in the circulation line of the heating cycle.
6. The air conditioning system as claimed in claim 1, wherein when the air conditioning system is operating in the first mode, both of the circulation lines are operating in a refrigeration cycle, both of the outdoor heat exchangers are operating in a condensing mode, and both of the indoor heat exchangers are operating in an evaporating mode.
7. The air conditioning system of claim 6, wherein the two outdoor heat exchangers operate at different condensing temperatures and the two indoor heat exchangers operate at different evaporating temperatures; or
The two outdoor heat exchangers work at the same condensing temperature, and the two indoor heat exchangers work at the same evaporating temperature.
8. The air conditioning system of claim 1, wherein when the air conditioning system is operating in the second mode, both of the circulation lines are operating in a heating cycle, both of the outdoor heat exchangers are operating in an evaporation mode, and both of the indoor heat exchangers are operating in a condensation mode.
9. The air conditioning system of claim 8, wherein the two outdoor heat exchangers operate at different evaporating temperatures and the two indoor heat exchangers operate at different condensing temperatures; or
The two outdoor heat exchangers work at the same evaporation temperature, and the two indoor heat exchangers work at the same condensation temperature.
10. The air conditioning system of claim 1, wherein said first indoor heat exchanger and said first electronic expansion valve are located within a first indoor machine and said second indoor heat exchanger and said second electronic expansion valve are located within a second indoor machine.
11. An operation method of an air conditioning system applied to the air conditioning system according to any one of claims 1 to 10, characterized in that:
when the air conditioning system performs double-path refrigeration, the two four-way reversing valves are controlled to simultaneously work in a first conduction mode, and the two electronic expansion valves simultaneously work in a partial diversion mode;
when the air conditioning system heats in two ways, the two four-way reversing valves are controlled to work in a second conduction mode at the same time, and the two electronic expansion valves work in a partial diversion mode at the same time;
when the air conditioning system heats and defrosts, one of the two four-way reversing valves is controlled to work in a first conduction mode, the electronic expansion valve in the circulation pipeline works in a full diversion mode, and the other four-way reversing valve works in a second conduction mode, and the electronic expansion valve in the circulation pipeline works in a partial diversion mode;
and when heating and defrosting are carried out, the conduction modes of the two four-way reversing valves are switched according to the ambient temperature of the indoor heat exchanger in the circulating pipeline where the four-way reversing valve working in the second conduction mode is located.
12. The method of operation of claim 11, wherein:
the four-way reversing valve is controlled to work in a first conduction mode by communicating the first interface with the second interface and communicating the third interface with the fourth interface; the four-way reversing valve is controlled to work in a second conduction mode by communicating the first interface with the third interface and communicating the second interface with the fourth interface; and
controlling the electronic expansion valve to work in a partial diversion mode by outputting 0-500 PPS pulses; and controlling the electronic expansion valve to work in a full diversion mode by continuously outputting 500PPS pulses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811222965.XA CN111076445A (en) | 2018-10-19 | 2018-10-19 | Air conditioning system and operation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811222965.XA CN111076445A (en) | 2018-10-19 | 2018-10-19 | Air conditioning system and operation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111076445A true CN111076445A (en) | 2020-04-28 |
Family
ID=70308440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811222965.XA Pending CN111076445A (en) | 2018-10-19 | 2018-10-19 | Air conditioning system and operation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111076445A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114087680A (en) * | 2020-07-30 | 2022-02-25 | 上海海立电器有限公司 | Air conditioning system and control method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002054831A (en) * | 2000-08-08 | 2002-02-20 | Sanyo Electric Co Ltd | Air-conditioning device |
| CN2516413Y (en) * | 2001-12-25 | 2002-10-16 | 石家庄车辆厂 | Unit-type double-system refrigeration machine set |
| CN102967104A (en) * | 2011-08-31 | 2013-03-13 | 三星电子株式会社 | Refrigerator and method for controlling the same |
| CN103528309A (en) * | 2012-07-06 | 2014-01-22 | 三星电子株式会社 | Refrigerator |
| CN105115181A (en) * | 2015-07-21 | 2015-12-02 | 上海日立电器有限公司 | Air conditioning system |
| CN205919550U (en) * | 2016-08-18 | 2017-02-01 | 合肥美菱股份有限公司 | Modularization multicycle refrigerating system and modularization forced air cooling refrigerator |
| CN206141268U (en) * | 2016-10-25 | 2017-05-03 | 珠海格力电器股份有限公司 | Heat pump air conditioning unit and [electric] motor coach |
-
2018
- 2018-10-19 CN CN201811222965.XA patent/CN111076445A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002054831A (en) * | 2000-08-08 | 2002-02-20 | Sanyo Electric Co Ltd | Air-conditioning device |
| CN2516413Y (en) * | 2001-12-25 | 2002-10-16 | 石家庄车辆厂 | Unit-type double-system refrigeration machine set |
| CN102967104A (en) * | 2011-08-31 | 2013-03-13 | 三星电子株式会社 | Refrigerator and method for controlling the same |
| CN103528309A (en) * | 2012-07-06 | 2014-01-22 | 三星电子株式会社 | Refrigerator |
| CN105115181A (en) * | 2015-07-21 | 2015-12-02 | 上海日立电器有限公司 | Air conditioning system |
| CN205919550U (en) * | 2016-08-18 | 2017-02-01 | 合肥美菱股份有限公司 | Modularization multicycle refrigerating system and modularization forced air cooling refrigerator |
| CN206141268U (en) * | 2016-10-25 | 2017-05-03 | 珠海格力电器股份有限公司 | Heat pump air conditioning unit and [electric] motor coach |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114087680A (en) * | 2020-07-30 | 2022-02-25 | 上海海立电器有限公司 | Air conditioning system and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211739592U (en) | Air conditioning system capable of continuously heating | |
| JP5951109B2 (en) | Air conditioner with additional unit for heating capacity enhancement | |
| CN110425764B (en) | Heat exchange system and control method | |
| CN105444453B (en) | A kind of dual temperature refrigeration and heating | |
| CN111780254A (en) | Air conditioning system and control method thereof | |
| WO2015158138A1 (en) | Refrigeration device | |
| CN109405102B (en) | Air Conditioning System | |
| CN110332635B (en) | Double-stage compression multi-air-supplementing refrigeration heat pump system, control method and air conditioner | |
| CN107860151B (en) | Heat pump system and air conditioner with same | |
| CN110411059B (en) | Double-evaporation-temperature heat pump system, air conditioner and control method | |
| CN111237928B (en) | Double-temperature double-flash air conditioner refrigerating system | |
| CN113154522B (en) | Multi-connected air conditioner system and defrosting control method | |
| CN110425765B (en) | Heat exchange system and control method | |
| CN101625175A (en) | Multifunctional air-condition heat pump device of single-double level compression and capable of free switch | |
| KR20200114031A (en) | An air conditioning apparatus | |
| CN110631286B (en) | Heat exchange system and control method | |
| CN111076444A (en) | Air conditioning system and operation method thereof | |
| CN108759157B (en) | One-time throttling two-stage compression heat pump system | |
| CN111076445A (en) | Air conditioning system and operation method thereof | |
| CN215638112U (en) | Refrigerating system | |
| CN215638113U (en) | Refrigerating system | |
| CN215930176U (en) | Refrigerating system | |
| CN215930175U (en) | Refrigerating system | |
| CN108759156B (en) | Secondary throttling middle incomplete cooling two-stage compression heat pump system | |
| CN113432172A (en) | Heat pump unit indoor unit and heat pump unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |