CN109186026B - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
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- CN109186026B CN109186026B CN201811326451.9A CN201811326451A CN109186026B CN 109186026 B CN109186026 B CN 109186026B CN 201811326451 A CN201811326451 A CN 201811326451A CN 109186026 B CN109186026 B CN 109186026B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0003—Exclusively-fluid systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides an air conditioning system and a control method thereof. The air conditioning system comprises a compressor (1), an indoor heat exchanger (2), an outdoor heat exchanger (3) and a refrigerant quantity adjusting device, wherein the refrigerant quantity adjusting device comprises a refrigerant regulator (4), a refrigerant inlet pipe (5) and a refrigerant outlet pipe (6), and the refrigerant quantity adjusting device is provided with a first working state that the refrigerant regulator (4) participates in refrigerant flowing circulation and a second working state that the refrigerant regulator (4) is used for storing the refrigerant and does not participate in the refrigerant flowing circulation. According to the air conditioning system provided by the invention, the refrigerant filling quantity of the air conditioning system under the low-frequency operation condition can be matched with the optimal filling quantity under the low-load or low-frequency condition, and the operation energy efficiency of the air conditioning system under the low-load or low-frequency condition is improved.
Description
Technical Field
The invention belongs to the technical field of air conditioning, and particularly relates to an air conditioning system and a control method thereof.
Background
The optimal filling amounts of the air conditioning system under different operation conditions are different, so that the filling amount of the air conditioning system is required to avoid influencing the low-frequency operation energy efficiency due to excessive low-frequency refrigerant amount on the premise of ensuring enough high-frequency refrigerant amount, namely the refrigerant filling amount of the air conditioning whole machine is required to be matched with the optimal filling amount under different frequencies of each working condition, thereby realizing the optimal energy efficiency requirement of the air conditioning operation. In addition, when the two-stage air conditioning system with the enthalpy increasing function actually operates, the compressor adopts the closed enthalpy increasing design under the low-frequency low-load condition, at the moment, the refrigerant regulator 4 is only equivalent to connecting a copper pipe with relatively large pipe diameter in series between two capillaries in the air conditioning system, the utilization value is low, no contribution is made to the air conditioning operation capacity and energy efficiency under the low load, the refrigerant filling quantity of the air conditioning system under the low-frequency operation condition cannot be matched with the optimal filling quantity under the low-frequency condition, and the operation energy efficiency of the air conditioning system under the low-frequency condition is reduced.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide an air conditioning system and a control method thereof, which can enable the refrigerant filling quantity of the air conditioning system under the low-frequency operation condition to be matched with the optimal filling quantity under the low-load or low-frequency condition, and improve the operation energy efficiency of the air conditioning system under the low-load or low-frequency condition.
In order to solve the above problems, the present invention provides an air conditioning system, which includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, and a refrigerant quantity adjusting device, wherein the refrigerant quantity adjusting device includes a refrigerant regulator, a refrigerant inlet pipe and a refrigerant outlet pipe, and the refrigerant quantity adjusting device has a first working state in which the refrigerant regulator participates in a refrigerant flow cycle and a second working state in which the refrigerant regulator is used for storing a refrigerant and does not participate in the refrigerant flow cycle.
Preferably, the refrigerant regulator is a flash evaporator, the air conditioning system further comprises an air supplementing pipeline, the air supplementing pipeline is connected between an air outlet of the refrigerant regulator and an air supplementing port of the compressor, and a first control valve is arranged on the air supplementing pipeline.
Preferably, a first throttle valve is arranged between the outdoor heat exchanger and the refrigerant quantity adjusting device; and/or a second throttle valve is arranged between the refrigerant quantity adjusting device and the indoor heat exchanger.
Preferably, the refrigerant quantity adjusting device further comprises a straight-through pipeline, one end of the refrigerant inlet pipe is connected to the refrigerant inlet of the refrigerant regulator, the other end of the refrigerant inlet pipe is connected to the outdoor heat exchanger, one end of the refrigerant outlet pipe is connected to the refrigerant outlet of the refrigerant regulator, the other end of the refrigerant outlet pipe is connected to the indoor heat exchanger, one end of the straight-through pipeline is connected to the outdoor heat exchanger, the other end of the straight-through pipeline is connected to the indoor heat exchanger, a second control valve is arranged on the refrigerant inlet pipe, a third control valve is arranged on the refrigerant outlet pipe, and a fourth control valve is arranged on the straight-through pipeline.
Preferably, the refrigerant quantity adjusting device further comprises a straight-through pipeline, one end of the refrigerant inlet pipe is connected to the refrigerant inlet of the refrigerant regulator, one end of the refrigerant outlet pipe is connected to the refrigerant outlet of the refrigerant regulator, the other end of the refrigerant outlet pipe is connected to the indoor heat exchanger, a third control valve is arranged on the refrigerant outlet pipe, one end of the straight-through pipeline is connected to the outdoor heat exchanger, the other end of the refrigerant inlet pipe and the other end of the straight-through pipeline are connected to the indoor heat exchanger through three-way valves, and the refrigerant inlet pipe and the straight-through pipeline are selectively communicated with the indoor heat exchanger through the three-way valves.
Preferably, the air conditioning system comprises a first throttle valve and a second throttle valve, the refrigerant quantity adjusting device further comprises a first four-way valve, a first interface of the first four-way valve is connected to the outdoor heat exchanger, a fourth interface of the first four-way valve is connected to the indoor heat exchanger, a second interface of the first four-way valve is connected to a refrigerant inlet pipe, and a third interface of the first four-way valve is connected to a refrigerant outlet pipe.
Preferably, the air conditioning system further comprises a second four-way valve connected with the exhaust port and the return port of the compressor, the outdoor heat exchanger and the indoor heat exchanger respectively.
According to another aspect of the present invention, there is provided a control method of the above air conditioning system, including:
acquiring the working state of a compressor;
when the compressor needs to perform enthalpy increasing, controlling the refrigerant quantity adjusting device to be in a first working state;
when the compressor needs to be closed for enthalpy increase, the refrigerant is controlled to flow through the refrigerant quantity adjusting device to adjust the refrigerant quantity in the air conditioning system, and after the refrigerant quantity in the air conditioning system is adjusted in place, the refrigerant device is controlled to be in a second working state, so that the refrigerant does not flow through the refrigerant regulator.
Preferably, the step of controlling the refrigerant quantity adjusting device to be in the first operating state includes:
opening the first control valve, the second control valve and the third control valve, and closing the fourth control valve;
after passing through the refrigerant regulator, a part of the gaseous refrigerant flows back to the air return port of the compressor from the air supplementing pipeline, and a part of the liquid refrigerant enters the main flow path through the refrigerant outlet pipe.
Preferably, the step of controlling the refrigerant quantity adjusting device to be in the first operating state includes:
the first interface and the second interface of the first four-way valve are controlled to be communicated, the third interface and the fourth interface are controlled to be communicated, and the first control valve is opened;
after the control refrigerant enters the refrigerant regulator through the four-way valve and the refrigerant inlet pipe, a part of gaseous refrigerant flows back to the air return port of the compressor from the air supplementing pipeline, and a part of liquid refrigerant enters the main flow path through the refrigerant outlet pipe through the third interface and the fourth interface of the first four-way valve.
Preferably, when the compressor needs to be turned off and enthalpy-increasing, controlling the refrigerant to flow through the refrigerant quantity adjusting device to adjust the refrigerant quantity in the air conditioning system, and after the refrigerant quantity in the air conditioning system is adjusted in place, controlling the refrigerant device to be in a second working state so that the refrigerant does not flow through the refrigerant regulator, wherein the step of controlling the refrigerant quantity adjusting device to be in a second working state comprises the following steps:
the first control valve and the second control valve are controlled to be opened, and the third control valve and the fourth control valve are controlled to be closed;
controlling the refrigerant to flow into the refrigerant regulator through the refrigerant inlet pipe to regulate the refrigerant quantity;
after the refrigerant quantity is regulated in place, the first control valve and the second control valve are controlled to be closed, the fourth control valve is controlled to be opened, and the refrigerant directly flows through the straight-through pipeline to enter the main flow path.
Preferably, when the compressor needs to be turned off and enthalpy-increasing, controlling the refrigerant to flow through the refrigerant quantity adjusting device to adjust the refrigerant quantity in the air conditioning system, and after the refrigerant quantity in the air conditioning system is adjusted in place, controlling the refrigerant device to be in a second working state so that the refrigerant does not flow through the refrigerant regulator, wherein the step of controlling the refrigerant quantity adjusting device to be in a second working state comprises the following steps:
the first interface and the second interface of the first four-way valve are controlled to be communicated, the third interface and the fourth interface are controlled to be communicated, and the first control valve is opened;
opening of the first throttle valve is regulated to be large, and opening of the second throttle valve is regulated to be small, so that the refrigerant starts to accumulate in the refrigerant regulator;
when the refrigerant quantity is regulated in place, the first four-way valve is controlled to change direction, and the first control valve is controlled to be closed at the same time, so that the first interface is communicated with the fourth interface, the second interface is communicated with the third interface, the refrigerant does not flow through the refrigerant regulator any more, and flows to the main flow path through the first interface and the fourth interface directly.
The invention provides an air conditioning system, which comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger and a refrigerant quantity adjusting device, wherein the refrigerant quantity adjusting device comprises a refrigerant regulator, a refrigerant inlet pipe and a refrigerant outlet pipe, and the refrigerant quantity adjusting device is provided with a first working state that the refrigerant regulator participates in refrigerant flow circulation and a second working state that the refrigerant regulator is used for storing a refrigerant and does not participate in refrigerant flow circulation. In the working process of the air conditioning system, when the compressor is in a high load or high frequency condition, the refrigerant quantity adjusting device can be controlled to be in a first working state, so that the refrigerant filling quantity in the air conditioning system is matched with the optimal filling quantity under the high load or high frequency condition, and when the compressor is in a low load or low frequency condition, the refrigerant quantity adjusting device can be controlled to be in a second working state, so that the refrigerant filling quantity in the air conditioning system is matched with the optimal filling quantity under the low load or low frequency condition, thereby effectively improving the working energy efficiency of the air conditioning system in the working process and enhancing the heat exchange effect of a heat exchanger of the air conditioning system.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioning system according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an air conditioning system in an enthalpy increasing open state according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of an air conditioning system in an enthalpy-increasing closing state according to a second embodiment of the present invention;
fig. 4 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention.
The reference numerals are expressed as:
1. a compressor; 2. an indoor heat exchanger; 3. an outdoor heat exchanger; 4. a refrigerant regulator; 5. a refrigerant inlet pipe; 6. a refrigerant outlet pipe; 7. an air supplementing pipeline; 8. a first control valve; 9. a first throttle valve; 10. a second throttle valve; 11. a straight-through pipeline; 12. a second control valve; 13. a third control valve; 14. a fourth control valve; 15. a first four-way valve; 16. and a second four-way valve.
Detailed Description
Referring to fig. 1 to 3 in combination, according to an embodiment of the present invention, an air conditioning system includes a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, and a refrigerant amount adjusting device including a refrigerant adjuster 4, a refrigerant inlet pipe 5, and a refrigerant outlet pipe 6, the refrigerant amount adjusting device having a first operation state in which the refrigerant adjuster 4 participates in a refrigerant flow cycle and a second operation state in which the refrigerant adjuster 4 is used for storing a refrigerant and does not participate in the refrigerant flow cycle.
In the working process of the air conditioning system, when the compressor is in a high load or high frequency condition, the refrigerant quantity adjusting device can be controlled to be in a first working state, so that the refrigerant filling quantity in the air conditioning system is matched with the optimal filling quantity under the high load or high frequency condition, and when the compressor is in a low load or low frequency condition, the refrigerant quantity adjusting device can be controlled to be in a second working state, so that the refrigerant filling quantity in the air conditioning system is matched with the optimal filling quantity under the low load or low frequency condition, thereby effectively improving the working energy efficiency of the air conditioning system in the working process and enhancing the heat exchange effect of a heat exchanger of the air conditioning system.
Through the mode, the refrigerant circulation quantity participating in the whole machine circulation can be changed according to the operation modes of the air conditioner under different loads, so that the liquid storage quantity of the heat exchanger under low load is reduced, and the heat exchange effect of the whole machine of the air conditioner is enhanced.
The refrigerant regulator 4 is a flash evaporator, the air conditioning system further comprises a gas supplementing pipeline 7, the gas supplementing pipeline 7 is connected between the gas outlet of the refrigerant regulator 4 and the gas supplementing port of the compressor 1, and a first control valve 8 is arranged on the gas supplementing pipeline 7. The refrigerant regulator 4 may be other containers with a refrigerant quantity regulating function, such as a copper tube with a certain volume of accommodating cavity, which can meet the requirements of refrigerant storage and supply.
Through setting up the moisturizing pipeline 7, can form the moisturizing in multistage compressor working process and increase the enthalpy, improve the work efficiency of air conditioner, simultaneously, owing to be provided with the first control valve 8 of this pipeline break-make on moisturizing pipeline 7, consequently can realize the switching operation of opening the enthalpy mode of compressor and closing the enthalpy mode through first control valve 8.
The air conditioning system can operate in an on-off enthalpy-increasing mode, so that the on-off enthalpy-increasing mode of the air conditioning system can be adjusted according to different loads of the air conditioning system, the flow of the refrigerant participating in the whole machine circulation is adjusted according to the on-off enthalpy-increasing mode of the air conditioning system, the refrigerant regulator 4 in the off enthalpy-increasing mode is utilized as a liquid storage tank for storing redundant refrigerant, the liquid storage capacity of the heat exchanger under low load is effectively reduced, the refrigerant filling quantity in the air conditioning system can be matched with the optimal filling quantity under low load when the air conditioning system is in the off enthalpy-increasing mode, and the heat exchange effect of the whole machine of the air conditioner is enhanced.
A first throttle valve 9 is arranged between the outdoor heat exchanger 3 and the refrigerant quantity adjusting device; and/or a second throttle valve 10 is arranged between the refrigerant quantity adjusting device and the indoor heat exchanger 2. The first throttle valve 9 and the second throttle valve 10 can play a role in throttling and reducing pressure, so that the liquid refrigerant is further reduced in pressure to be a gaseous refrigerant, the heat absorption effect of the refrigerant can be improved, and the heat exchange capacity of the refrigerant is improved.
The air conditioning system further comprises a second four-way valve 16, wherein the second four-way valve 16 is respectively connected with the exhaust port and the return port of the compressor 1, the outdoor heat exchanger 3 and the indoor heat exchanger 2.
Referring to fig. 1 in combination, according to the first embodiment of the present invention, the refrigerant quantity adjusting device further includes a through pipe 11, one end of the refrigerant inlet pipe 5 is connected to the refrigerant inlet of the refrigerant regulator 4, the other end of the refrigerant inlet pipe 5 is connected to the outdoor heat exchanger 3, one end of the refrigerant outlet pipe 6 is connected to the refrigerant outlet of the refrigerant regulator 4, the other end of the refrigerant outlet pipe 6 is connected to the indoor heat exchanger 2, one end of the through pipe 11 is connected to the outdoor heat exchanger 3, the other end is connected to the indoor heat exchanger 2, the refrigerant inlet pipe 5 is provided with a second control valve 12, the refrigerant outlet pipe 6 is provided with a third control valve 13, and the through pipe 11 is provided with a fourth control valve 14.
When the air conditioning system is in a refrigeration mode, the refrigerant flows out of the outdoor heat exchanger 3, then is throttled by the first throttle valve 9, and then can have two flow paths, when the air conditioning system is in an enthalpy-increasing opening mode, the refrigerant enters the refrigerant regulator 4 through the refrigerant inlet pipe 5, then the gaseous refrigerant flows into the air supplementing port of the compressor from the air outlet of the refrigerant regulator 4 through the air supplementing pipeline 7, air supplementing and enthalpy increasing are carried out on the compressor, at the moment, the straight-through pipeline 11 is disconnected, and the refrigerant in the refrigerant regulator 4 participates in the refrigerant circulation of the air conditioning system. When the indoor heat exchanger is in the enthalpy-increasing closing mode, the refrigerant inlet pipe 5, the refrigerant outlet pipe 6 and the air supplementing pipeline 7 are in a closed state, and the refrigerant can directly enter the main flow path through the straight-through pipeline 11 and enter the indoor heat exchanger for heat exchange after being throttled again through the second throttle valve 10 in the main flow path. When the enthalpy-increasing mode of the pipe is entered, if the refrigerant quantity in the system needs to be reduced, the refrigerant outlet pipe 6 and the straight-through pipeline 11 can be closed firstly, so that the refrigerant can enter the refrigerant regulator 4 through the refrigerant inlet pipe 5 for storage, when the refrigerant quantity in the air conditioning system reaches the required refrigerant quantity, the pipeline is regulated, so that the refrigerant does not flow through the refrigerant regulator 4 any more, at the moment, the refrigerant regulator 4 does not participate in refrigerant circulation any more, and the refrigerant filling quantity in the air conditioning system can be matched with the optimal filling quantity in the state, so that the working energy efficiency of the air conditioning system is improved.
The main flow path refers to a main circulation flow path of the air conditioning system, that is, a circulation flow path of a refrigerant of the air conditioning system flowing through the compressor, the outdoor heat exchanger, the throttle valve and the indoor heat exchanger.
In another embodiment not shown in the drawings, the refrigerant quantity adjusting device further includes a through pipe 11, one end of the refrigerant inlet pipe 5 is connected to the refrigerant inlet of the refrigerant regulator 4, one end of the refrigerant outlet pipe 6 is connected to the refrigerant outlet of the refrigerant regulator 4, the other end of the refrigerant outlet pipe 6 is connected to the indoor heat exchanger 2, a third control valve 13 is provided on the refrigerant outlet pipe 6, one end of the through pipe 11 is connected to the outdoor heat exchanger 3, the other end of the refrigerant inlet pipe 5 and the other end of the through pipe 11 are connected to the indoor heat exchanger 2 through three-way valves, and the refrigerant inlet pipe 5 and the through pipe 11 are selectively communicated with the indoor heat exchanger 2 through the three-way valves.
In the present embodiment, the above-described control effect can be also achieved by replacing the functions of the third control valve 13 and the fourth control valve 14 with one three-way valve.
As shown in fig. 2 and 3 in combination, according to the second embodiment of the present invention, the air conditioning system includes a first throttle valve 9 and a second throttle valve 10, the refrigerant amount adjusting device further includes a first four-way valve 15, a first port E of the first four-way valve 15 is connected to the outdoor heat exchanger 3, a fourth port H of the first four-way valve 15 is connected to the indoor heat exchanger 2, a second port F of the first four-way valve 15 is connected to the refrigerant inlet pipe 5, and a third port G of the first four-way valve 15 is connected to the refrigerant outlet pipe 6.
In this embodiment, when the air conditioning system is in the enthalpy increasing mode, only the valve core of the first four-way valve 15 is required to be controlled, so that the first interface E is communicated with the second interface F, the third interface G is communicated with the fourth interface H, and meanwhile, the first control valve 8 is opened, so that the refrigerant regulator 4 participates in the refrigerant circulation, and meanwhile, the air refrigerant can be subjected to air supplementing and enthalpy increasing through the air supplementing pipeline 7, so that the working performance of the air conditioning system is improved. When the refrigerant quantity is required to be adjusted, the first four-way valve 15 can be firstly in an enthalpy-increasing operation state, then the first throttle valve 9 is adjusted to be large, the second throttle valve 10 is adjusted to be small, so that the refrigerant enters the refrigerant regulator 4 more, and flows out of the refrigerant regulator 4 less, the circulation quantity of the refrigerant can be reduced, and the redundant refrigerant is stored in the refrigerant regulator 4.
Referring to fig. 4 in combination, according to an embodiment of the present invention, a control method of an air conditioning system includes: acquiring the working state of the compressor 1; when the compressor 1 needs to perform enthalpy increasing, controlling the refrigerant quantity adjusting device to be in a first working state; when the compressor 1 needs to be closed for enthalpy increase, the refrigerant is controlled to flow through the refrigerant quantity adjusting device to adjust the refrigerant quantity in the air conditioning system, and after the refrigerant quantity in the air conditioning system is adjusted in place, the refrigerant device is controlled to be in a second working state, so that the refrigerant does not flow through the refrigerant regulator 4.
In the working process of the air conditioning system, when the compressor is in a high load or high frequency condition, the refrigerant quantity adjusting device can be controlled to be in a first working state, so that the refrigerant filling quantity in the air conditioning system is matched with the optimal filling quantity under the high load or high frequency condition, and when the compressor is in a low load or low frequency condition, the refrigerant quantity adjusting device can be controlled to be in a second working state, so that the refrigerant filling quantity in the air conditioning system is matched with the optimal filling quantity under the low load or low frequency condition, thereby effectively improving the working energy efficiency of the air conditioning system in the working process and enhancing the heat exchange effect of a heat exchanger of the air conditioning system.
The step of controlling the refrigerant quantity adjusting device to be in the first working state comprises the following steps: the first control valve 8, the second control valve 12 and the third control valve 13 are opened, and the fourth control valve 14 is closed; after passing through the refrigerant regulator 4, a part of the gaseous refrigerant flows back to the air return port of the compressor 1 from the air supplementing pipeline 7, and a part of the liquid refrigerant enters the main flow path through the refrigerant outlet pipe 6.
The step of controlling the refrigerant quantity adjusting device to be in the first working state comprises the following steps: the first interface E and the second interface F of the first four-way valve 15 are controlled to be communicated, the third interface G and the fourth interface H are controlled to be communicated, and the first control valve 8 is opened; after the control refrigerant enters the refrigerant regulator 4 through the four-way valve and the refrigerant inlet pipe 5, a part of gaseous refrigerant flows back to the air return port of the compressor 1 from the air supplementing pipeline 7, and a part of liquid refrigerant enters the main flow path through the refrigerant outlet pipe 6 through the third port G and the fourth port H of the first four-way valve 15.
When the compressor 1 needs to be closed for enthalpy increase, controlling the refrigerant to flow through the refrigerant quantity adjusting device to adjust the refrigerant quantity in the air conditioning system, and after the refrigerant quantity in the air conditioning system is adjusted in place, controlling the refrigerant device to be in a second working state so that the refrigerant does not flow through the refrigerant regulator 4, wherein the step of controlling the refrigerant quantity adjusting device comprises the following steps: the first control valve 8 and the second control valve 12 are controlled to be opened, and the third control valve 13 and the fourth control valve 14 are controlled to be closed; controlling the refrigerant to flow into the refrigerant regulator 4 through the refrigerant inlet pipe 5 to regulate the refrigerant quantity; after the refrigerant quantity is regulated in place, the first control valve 8 and the second control valve 12 are controlled to be closed, the fourth control valve 14 is controlled to be opened, and the refrigerant directly flows through the straight-through pipeline 11 to enter the main flow path.
When the compressor 1 needs to be closed for enthalpy increase, controlling the refrigerant to flow through the refrigerant quantity adjusting device to adjust the refrigerant quantity in the air conditioning system, and after the refrigerant quantity in the air conditioning system is adjusted in place, controlling the refrigerant device to be in a second working state so that the refrigerant does not flow through the refrigerant regulator 4, wherein the step of controlling the refrigerant quantity adjusting device comprises the following steps: the first interface E and the second interface F of the first four-way valve 15 are controlled to be communicated, the third interface G and the fourth interface H are controlled to be communicated, and the first control valve 8 is opened; the opening degree of the first throttle valve 9 is regulated to be larger, and the opening degree of the second throttle valve 10 is regulated to be smaller, so that the refrigerant starts to accumulate in the refrigerant regulator 4; when the refrigerant quantity is regulated in place, the first four-way valve 15 is controlled to change direction, and the first control valve 8 is controlled to be closed at the same time, so that the first interface E is communicated with the fourth interface H, the second interface F is communicated with the third interface G, the refrigerant does not flow through the refrigerant regulator 4 any more, and flows to the main flow path directly through the first interface E and the fourth interface H.
For the air conditioning system of the first embodiment, under the condition of high load or high frequency, the capacity and energy efficiency are improved by opening the whole machine to increase the enthalpy, at this time, the first control valve 8 is opened, the second control valve 12 and the third control valve 13 are also opened, the fourth control valve 14 is closed, at this time, the normal-temperature high-pressure supercooled liquid refrigerant discharged from the outdoor heat exchanger 3 enters the first throttle valve 9 to be throttled, then enters the refrigerant regulator 4 to flash through the opened second control valve 12, the gaseous refrigerant is supplemented into the compressor to increase the enthalpy through the first control valve 8, and the liquid refrigerant enters the second throttle valve 10 through the opened third control valve 13 to complete the circulation of the main path, thereby forming a conventional air supplementing and enthalpy increasing process. At this time, the refrigerant poured into the system is completely used for complete machine circulation, and participates in the heat absorption and heat release processes.
Under the condition of low load or low frequency, the whole machine needs to be closed for enthalpy increase so as to reduce the power output of the compressor, the first control valve 8 is closed at the moment, the refrigerant is directly introduced into the refrigerant regulator 4 from the outlet of the first throttle valve 9 and then flows out from the outlet of the refrigerant regulator 4 to the second throttle valve 10, and at the moment, the refrigerant regulator 4 is equivalent to a pipeline with a large pipe diameter in the air conditioning system, no substantial effect exists and the resistance of the refrigerant in flowing is increased. In the scheme, when the air conditioner is changed from the open enthalpy to the close enthalpy, through control logic, the third control valve 13 and the fourth control valve 14 are closed, at the moment, the refrigerant at the outlet of the first throttle valve 9 can only enter the refrigerant regulator 4 through the second control valve 12, the third control valve 13 is closed, at the moment, the refrigerant regulator 4 slowly stores liquid refrigerant, after the air conditioner is in a proper state, the first control valve 8, the second control valve 12 and the third control valve 13 are closed, and the fourth control valve 14 is opened, so that the whole system is adjusted to be a common single-stage air conditioning system with two throttle valves connected in series.
For the air conditioning system of the second embodiment, when the enthalpy of the whole air conditioning system is increased, the first port E and the second port F of the first four-way valve 15 are communicated, the third port G and the fourth port H are communicated, the first control valve 8 is opened, at this time, after the refrigerant passes through the first throttle valve 9, the refrigerant enters the refrigerant regulator 4 through the first port E and the second port F to flash, the gas is fed into the compressor, and the liquid flows out of the refrigerant regulator 4 and enters the second throttle valve 10 through the third port G and the fourth port H to perform main circulation.
When the enthalpy is increased, the first throttle valve 9 is firstly adjusted to be large, the second throttle valve 10 is firstly adjusted to be small, so that liquid storage is started in the refrigerant regulator 4, after the refrigerant quantity regulation reaches the preset requirement, the flow path of the first four-way valve 15 is switched to enable the first interface E to be communicated with the fourth interface H, the second interface F to be communicated with the third interface G, and meanwhile, the first control valve 8 is closed, and the running mode of the whole air conditioner is the enthalpy increasing closing mode.
The valve components are adopted to open and close, so that the refrigerant circulation quantity of the air conditioning system in the two modes of opening and closing and increasing the enthalpy can be adjusted, the energy of the whole air conditioning system is improved, and the heat exchange effect of the heat exchanger is enhanced.
It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (11)
1. An air conditioning system is characterized by comprising a compressor (1), an indoor heat exchanger (2), an outdoor heat exchanger (3) and a refrigerant quantity adjusting device, wherein the refrigerant quantity adjusting device comprises a refrigerant regulator (4), a refrigerant inlet pipe (5) and a refrigerant outlet pipe (6), and the refrigerant quantity adjusting device is provided with a first working state that the refrigerant regulator (4) participates in refrigerant flowing circulation and a second working state that the refrigerant regulator (4) is used for storing a refrigerant and does not participate in the refrigerant flowing circulation; the refrigerant quantity adjusting device further comprises a straight-through pipeline (11), one end of the refrigerant inlet pipe (5) is connected to a refrigerant inlet of the refrigerant regulator (4), the other end of the refrigerant inlet pipe (5) is connected to the outdoor heat exchanger (3), one end of the refrigerant outlet pipe (6) is connected to a refrigerant outlet of the refrigerant regulator (4), the other end of the refrigerant outlet pipe (6) is connected to the indoor heat exchanger (2), one end of the straight-through pipeline (11) is connected to the outdoor heat exchanger (3), the other end of the straight-through pipeline is connected to the indoor heat exchanger (2), a second control valve (12) is arranged on the refrigerant inlet pipe (5), a third control valve (13) is arranged on the refrigerant outlet pipe (6), and a fourth control valve (14) is arranged on the straight-through pipeline (11).
2. Air conditioning system according to claim 1, characterized in that the refrigerant regulator (4) is a flash evaporator, the air conditioning system further comprises a gas supplementing pipeline (7), the gas supplementing pipeline (7) is connected between the gas outlet of the refrigerant regulator (4) and the gas supplementing port of the compressor (1), and a first control valve (8) is arranged on the gas supplementing pipeline (7).
3. The air conditioning system according to claim 1, characterized in that a first throttle valve (9) is provided between the outdoor heat exchanger (3) and the refrigerant quantity adjusting device; and/or a second throttle valve (10) is arranged between the refrigerant quantity adjusting device and the indoor heat exchanger (2).
4. Air conditioning system according to claim 1, characterized in that the refrigerant quantity adjusting device further comprises a through pipe (11), one end of the refrigerant inlet pipe (5) is connected to the refrigerant inlet of the refrigerant regulator (4), one end of the refrigerant outlet pipe (6) is connected to the refrigerant outlet of the refrigerant regulator (4), the other end of the refrigerant outlet pipe (6) is connected to the indoor heat exchanger (2), a third control valve (13) is provided on the refrigerant outlet pipe (6), one end of the through pipe (11) is connected to the outdoor heat exchanger (3), the other end of the refrigerant inlet pipe (5) and the other end of the through pipe (11) are connected to the indoor heat exchanger (2) through a three-way valve, and the refrigerant inlet pipe (5) and the through pipe (11) are selectively communicated with the indoor heat exchanger (2) through the three-way valve.
5. An air conditioning system according to claim 3, characterized in that the air conditioning system comprises a first throttle valve (9) and a second throttle valve (10), the refrigerant quantity adjusting device further comprises a first four-way valve (15), a first interface of the first four-way valve (15) is connected to the outdoor heat exchanger (3), a fourth interface of the first four-way valve (15) is connected to the indoor heat exchanger (2), a second interface of the first four-way valve (15) is connected to the refrigerant inlet pipe (5), and a third interface of the first four-way valve (15) is connected to the refrigerant outlet pipe (6).
6. An air conditioning system according to any of claims 1 to 4, characterized in that the air conditioning system further comprises a second four-way valve (16), the second four-way valve (16) being connected to the exhaust and return ports of the compressor (1), the outdoor heat exchanger (3) and the indoor heat exchanger (2), respectively.
7. The control method of an air conditioning system according to any one of claims 1 to 6, comprising:
acquiring the working state of the compressor (1);
when the compressor (1) needs to perform enthalpy increasing, controlling the refrigerant quantity adjusting device to be in a first working state;
when the compressor (1) needs to be closed for enthalpy increase, the refrigerant is controlled to flow through the refrigerant quantity adjusting device to adjust the refrigerant quantity in the air conditioning system, and after the refrigerant quantity in the air conditioning system is adjusted in place, the refrigerant device is controlled to be in a second working state, so that the refrigerant does not flow through the refrigerant regulator (4).
8. The control method according to claim 7, wherein the step of controlling the refrigerant quantity adjusting device to be in the first operation state includes:
opening the first control valve (8), the second control valve (12) and the third control valve (13), and closing the fourth control valve (14);
after passing through the refrigerant regulator (4), a part of the gaseous refrigerant flows back to the air return port of the compressor (1) from the air supplementing pipeline (7), and a part of the liquid refrigerant enters the main flow path through the refrigerant outlet pipe (6).
9. The control method according to claim 7, wherein the step of controlling the refrigerant quantity adjusting device to be in the first operation state includes:
the first interface and the second interface of the first four-way valve (15) are controlled to be communicated, the third interface and the fourth interface are controlled to be communicated, and the first control valve (8) is opened;
after the control refrigerant enters the refrigerant regulator (4) through the four-way valve and the refrigerant inlet pipe (5), a part of gaseous refrigerant flows back to the air return port of the compressor (1) from the air supplementing pipeline (7), and a part of liquid refrigerant enters the main flow path through the refrigerant outlet pipe (6) through the third port and the fourth port of the first four-way valve (15).
10. The control method according to claim 7, wherein when the compressor (1) needs to be turned off for enthalpy increase, controlling the refrigerant to flow through the refrigerant amount adjusting device to adjust the refrigerant amount in the air conditioning system, and after the refrigerant amount in the air conditioning system is adjusted in place, controlling the refrigerant device to be in the second operating state so that the refrigerant does not flow through the refrigerant adjuster (4), includes:
the first control valve (8) and the second control valve (12) are controlled to be opened, and the third control valve (13) and the fourth control valve (14) are controlled to be closed;
controlling the refrigerant to flow into the refrigerant regulator (4) through the refrigerant inlet pipe (5) to regulate the refrigerant quantity;
after the refrigerant quantity is regulated in place, the first control valve (8) and the second control valve (12) are controlled to be closed, the fourth control valve (14) is controlled to be opened, and the refrigerant directly flows through the straight-through pipeline (11) to enter the main flow path.
11. The control method according to claim 7, wherein when the compressor (1) needs to be turned off for enthalpy increase, controlling the refrigerant to flow through the refrigerant amount adjusting device to adjust the refrigerant amount in the air conditioning system, and after the refrigerant amount in the air conditioning system is adjusted in place, controlling the refrigerant device to be in the second operating state so that the refrigerant does not flow through the refrigerant adjuster (4), includes:
the first interface and the second interface of the first four-way valve (15) are controlled to be communicated, the third interface and the fourth interface are controlled to be communicated, and the first control valve (8) is opened;
the opening degree of the first throttle valve (9) is increased, and the opening degree of the second throttle valve (10) is reduced, so that the refrigerant starts to accumulate in the refrigerant regulator (4);
when the refrigerant quantity is regulated in place, the first four-way valve (15) is controlled to change direction, and the first control valve (8) is controlled to be closed at the same time, so that the first interface is communicated with the fourth interface, the second interface is communicated with the third interface, the refrigerant does not flow through the refrigerant regulator (4) any more, and flows to the main flow path directly through the first interface and the fourth interface.
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| CN109855322A (en) * | 2019-02-21 | 2019-06-07 | 珠海格力电器股份有限公司 | A kind of throttling method and unit of the unit improving heat exchange efficiency |
| CN111829173A (en) * | 2019-04-23 | 2020-10-27 | 杭州先途电子有限公司 | Control method and system and air source heat pump air heater |
| CN110940108A (en) * | 2019-12-12 | 2020-03-31 | 珠海格力电器股份有限公司 | Flash evaporation type enthalpy-increasing hot water unit and refrigerant storage and release control method thereof |
| CN112944617B (en) * | 2021-01-29 | 2022-09-06 | 青岛海尔空调器有限总公司 | Control method and device for air conditioner and air conditioner |
| CN112944613B (en) * | 2021-01-29 | 2022-11-15 | 青岛海尔空调器有限总公司 | Control method and device for air conditioner and air conditioner |
| CN113531933B (en) * | 2021-07-05 | 2022-07-26 | 珠海格力电器股份有限公司 | Refrigerant circulation quantity adjusting method and device and air conditioning system |
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