CN111023454A - Air conditioner and control method thereof - Google Patents
Air conditioner and control method thereof Download PDFInfo
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- CN111023454A CN111023454A CN201911362820.4A CN201911362820A CN111023454A CN 111023454 A CN111023454 A CN 111023454A CN 201911362820 A CN201911362820 A CN 201911362820A CN 111023454 A CN111023454 A CN 111023454A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003507 refrigerant Substances 0.000 claims abstract description 115
- 238000010257 thawing Methods 0.000 claims abstract description 96
- 238000010438 heat treatment Methods 0.000 claims abstract description 43
- 239000002918 waste heat Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses an air conditioner and a control method thereof, wherein a system comprises a refrigerant circulation main loop, a first branch pipeline, a second branch pipeline and a third branch pipeline; the first electromagnetic valve is arranged on the first branch pipeline and used for adjusting the flow of a refrigerant flowing in the first branch pipeline; the second electromagnetic valve is used for adjusting the flow of the refrigerant flowing in the second branch pipeline; the third electromagnetic valve is used for stopping the circulation of the refrigerant in the defrosting mode; and the refrigerant valve is used for switching on or off the third branch pipeline when entering a defrosting mode. The embodiment of the invention optimizes the air conditioner, does not need to pause the heating mode during defrosting, realizes the simultaneous operation of the heating mode and the defrosting mode, can ensure that the indoor unit continuously blows hot air to meet the heat supply requirement, can effectively realize defrosting, improves the use comfort of the air conditioner of a user and prolongs the service life of the air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to an air conditioner and a control method thereof.
Background
The existing air conditioner operates in severe cold weather, an outdoor unit begins to frost after a short time, the frost is more and more increased along with the extension of the operation time, the heating effect of the air conditioner is poor, then the air conditioner needs to enter a defrosting stage, the heating mode can be operated again after the defrosting is finished, then the air conditioner frosts again, the circulation is not more than continuous, the frequent frosting and defrosting of the air conditioner are caused, the heating effect is more and more poor, the comfortable temperature required by a human body cannot be reached, the comfort level is poor, and even the air conditioner cannot operate below-20 ℃.
In the research of the prior art, the inventor of the invention finds that when the air conditioner defrosts, the compressor is in the processes of stopping, starting, stopping and starting, and the defrosting can be realized only by switching the heating mode to the cooling mode through switching the four-way valve, so that the indoor air outlet temperature is directly influenced, and the comfort level is greatly reduced.
Disclosure of Invention
The invention provides an air conditioner and a control method thereof, aiming at solving the technical problem of insufficient heating capacity caused by frequent defrosting of the existing air conditioner in a low-temperature environment.
In order to solve the above technical problem, an embodiment of the present invention provides an air conditioner, including:
the refrigerant circulation main loop comprises a compressor, a four-way reversing valve, an indoor heat exchange device, an outdoor heat exchange device and a throttling component which are sequentially connected through a main pipeline;
characterized in that, the air conditioner still includes:
a first branch pipe branched from a main pipe predetermined position between a discharge end of the compressor and the indoor heat exchange device and connected to a first refrigerant port of the outdoor heat exchange device; and
a second branch pipe branched from the main pipe between the four-way reversing valve and the first refrigerant port of the outdoor heat exchange device and connected to the second refrigerant port of the outdoor heat exchange device; and
the first electromagnetic valve is arranged on the first branch pipeline and used for conducting the first branch pipeline when the defrosting mode operates;
the second electromagnetic valve is arranged on the second branch pipeline and used for conducting the second branch pipeline when the defrosting mode operates;
and the third electromagnetic valve is arranged on the main pipeline between the second branch pipeline and the first refrigerant port of the outdoor heat exchange device and used for stopping the circulation of the refrigerant in the defrosting mode.
In one embodiment, the air conditioner further includes:
and a third branch pipe branched from a predetermined position of the main pipe between the indoor heat exchanging apparatus and the throttling part and connected to the first refrigerant port of the outdoor heat exchanging apparatus.
In one embodiment, the air conditioner further includes:
and the refrigerant valve is arranged on the third branch pipeline and used for switching on or off the third branch pipeline when the defrosting mode operates.
In one embodiment, the refrigerant valve is a fourth solenoid valve configured to adjust a flow rate of the refrigerant flowing through the third branch pipe in the defrosting mode.
In one embodiment, the refrigerant valve is a check valve configured to open or close the third branch pipeline in a defrosting mode;
the inlet end of the one-way valve is communicated with the inlet end of the third branch pipeline, and the outlet end of the one-way valve is communicated with the outlet end of the third branch pipeline.
In one embodiment, the predetermined position of the main pipeline between the indoor heat exchange device and the throttling component is located on a first main pipeline between the four-way reversing valve and the indoor heat exchange device, one end of the first branch pipeline is connected to the first main pipeline, and the other end of the first branch pipeline is connected to the first refrigerant port of the outdoor heat exchange device.
In one embodiment, a predetermined position of a main path pipeline between the indoor heat exchange device and the throttling component is disposed on a second main path pipeline between the four-way reversing valve and the exhaust end of the compressor, so that one end of the first branch pipeline is connected to the second main path pipeline, and the other end of the first branch pipeline is connected to a first refrigerant port of the outdoor heat exchange device.
In one embodiment, in the refrigerant circulation main loop, a discharge end of the compressor is communicated with a first end of the four-way reversing valve, a second end of the four-way reversing valve is communicated with one end of the indoor heat exchange device, and a third end of the four-way reversing valve is communicated with a gas return end of the compressor;
the other end of the indoor heat exchange device is communicated with one end of the throttling component, the other end of the throttling component is communicated with a second refrigerant port of the outdoor heat exchange device, and a first refrigerant port of the outdoor heat exchange device is communicated with the fourth end of the four-way reversing valve through the third electromagnetic valve;
the compressor compresses a refrigerant at a high temperature and a high pressure;
the four-way reversing valve conveys the refrigerant of the compressor to the indoor heat exchange device in a heating mode or a defrosting mode and recovers the refrigerant of the outdoor heat exchange device to the compressor;
the indoor heat exchange device flows through the indoor heat exchange device from a refrigerant of the compressor in a heating mode or a defrosting mode;
the throttling component is arranged on a main pipeline between the indoor heat exchange device and the outdoor heat exchange device so as to decompress the refrigerant;
the outdoor heat exchange device is used for allowing the refrigerant flowing out of the throttling component to flow through the outdoor heat exchange device in the heating mode; and the refrigerant flowing from the first branch pipe and/or the second branch pipe flows through the outdoor heat exchange device in the defrosting mode.
In one embodiment, a first stop valve is arranged on a main pipeline between the four-way reversing valve and the indoor heat exchange device, and a second stop valve is arranged on a main pipeline between the indoor heat exchange device and the throttling component.
In one embodiment, the air conditioner further includes a controller, and the controller is electrically connected to the compressor, the four-way reversing valve, the indoor heat exchanging device, the outdoor heat exchanging device, the throttling component, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, and the refrigerant valve, respectively.
The invention also provides a control method for the air conditioner, which at least comprises the following steps:
when the defrosting condition is met, operating a defrosting mode;
and when the defrosting mode is operated, the heating operation state of the four-way reversing valve is kept, the first electromagnetic valve and the second electromagnetic valve are started, and the third electromagnetic valve and the fan of the outdoor heat exchange device are closed.
In one embodiment, the control method further includes:
when the defrosting mode is operated, controlling the compressor to increase the heating frequency to a preset defrosting frequency;
and when the defrosting exit condition is met, controlling the compressor to reduce the frequency from the preset defrosting frequency to the heating frequency.
In one embodiment, the control method further includes:
and when the defrosting mode is operated, the refrigerant valve is started.
The embodiment of the invention has the following beneficial effects:
(1) by setting a bypass loop for defrosting:
and the refrigerant on the main pipeline among the four-way reversing valve, the indoor heat exchange device and the throttling component is partially guided to the outdoor heat exchange device through the first branch pipeline and the third branch pipeline, so that the refrigerant with higher temperature in the borrowed part is used for defrosting of the outdoor heat exchange device.
(2) The defrosting process does not need to pause a heating mode, switch the four-way reversing valve, and frequently start and stop the compressor, so that the continuous heat supply of the indoor heat exchange device can be ensured:
when defrosting of the outdoor heat exchange device is needed under a low temperature condition, the four-way reversing valve does not need to be switched, the compressor does not need to be started or stopped, the heating mode does not need to be switched to the refrigerating mode, at the moment, the evaporation heat absorption function of the outdoor heat exchange device is stopped, the main pipeline between the four-way reversing valve and the outdoor heat exchange device is cut off through the third electromagnetic valve, then a bypass loop inputs a part of refrigerant with higher temperature in a refrigerant circulation main loop into the outdoor heat exchange device from a first refrigerant end port of the outdoor heat exchange device, and refrigerant flowing out of a second refrigerant port of the outdoor heat exchange device flows back into the compressor through the second electromagnetic valve and the four-way reversing valve, so that the temperature of the outdoor heat exchange device is improved, and the aim of rapid defrosting is fulfilled. In addition, the third branch pipeline can be conducted through the refrigerant valve, so that the residual heat of the indoor heat exchange device is conducted into the outdoor heat exchange device, and the purpose of accelerating defrosting is achieved.
(3) The control is simple, and the improvement cost is low:
through valve member on first branch road pipeline, second branch road pipeline, third branch road pipeline and the pipeline founds the bypass return circuit, need not to switch the continuity of four-way reversing valve, change the mode of heating realizes the indoor set heats, even also can blow off hot-blast when changing the frost, satisfies the heat supply demand, improves user's comfort level, and only realize the route switching of refrigerant through 4 valve members moreover to the heat of refrigerant has been utilized effectively and has been changed the frost, and control is simple, and improvement cost is low.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of an air conditioner according to a first embodiment of the present invention;
FIG. 2 illustrates a refrigerant flow path during operation in the heating mode of FIG. 1;
fig. 3 illustrates a refrigerant flow path in the heating defrosting mode of fig. 1;
fig. 4 is a schematic structural view of an air conditioner according to a second embodiment of the present invention;
fig. 5 is a schematic structural view of an air conditioner according to a third embodiment of the present invention;
fig. 6 is a flowchart of a control method of an air conditioner according to a fourth embodiment of the present invention;
fig. 7 is a schematic view of a defrosting control of an air conditioner according to a fourth embodiment of the present invention;
wherein the reference numbers in the drawings of the specification are as follows:
1. a compressor; 2. a four-way reversing valve; 3. an indoor heat exchange device; 4. a throttling member; 5. an outdoor heat exchange device;
6. a first solenoid valve; 7. a second solenoid valve; 8. a third electromagnetic valve; 9. a refrigerant valve; 91. a fourth solenoid valve; 92. a one-way valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are generally only used to distinguish one element from another. In addition, it will be understood that when an element is referred to as being "connected to" another element, it can be connected to the other element or intervening elements. In contrast, when an element is referred to as being "directly connected to" another element, there are no intervening elements present. In addition, it should be understood that a singular reference may include the plural unless it is meant to be clearly different from the context. In addition, it should be understood that terms such as "including" or "having" are used herein, it should be understood that they are intended to indicate the presence of the features, numbers, steps, functions, multiple components, or combinations thereof disclosed in the specification, and it should also be understood that more or less features, numbers, steps, functions, several components, or combinations thereof may be used as well.
The first embodiment of the present invention:
referring to fig. 1, fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment disclosed herein.
The air conditioner of the embodiment comprises a refrigerant circulation main loop, wherein the refrigerant circulation main loop comprises a compressor 1, a four-way reversing valve 2, an indoor heat exchange device 3, an outdoor heat exchange device 5 and a throttling component 4 which are sequentially connected through a main pipeline, and the air conditioner has the functions of refrigerating, heating and defrosting.
Meanwhile, in order to perform the defrosting function without performing the reverse circulation operation when the air conditioner performs the heating mode, the following configuration may be further included, as shown in fig. 1, which illustrates an improved bypass branch structural design based on the refrigerant circulation main circuit.
More specifically, a first branch pipe branched from a main pipe predetermined position between the discharge end of the compressor 1 and the indoor heat exchange device 3 and connected to a first refrigerant port of the outdoor heat exchange device 5; and a second branch pipe branched from a main pipe between the four-way reversing valve 2 and the first refrigerant port of the outdoor heat exchanging device 5 and connected to the second refrigerant port of the outdoor heat exchanging device 5; and a third branch pipe branched from a predetermined position of the main pipe between the indoor heat exchange device 3 and the throttling part 4 and connected to the first refrigerant port of the outdoor heat exchange device 5; the first electromagnetic valve 6 is arranged on the first branch pipeline and used for conducting the first branch pipeline when the defrosting mode operates; the second electromagnetic valve 7 is arranged on the second branch pipeline and used for conducting the second branch pipeline when the defrosting mode operates; a third solenoid valve 8 disposed on the main path pipe between the second branch pipe and the first refrigerant port of the outdoor heat exchange device 5, for stopping the refrigerant from flowing in the defrosting mode; and the refrigerant valve 9 is arranged on the third branch pipeline and used for switching on or off the third branch pipeline when the defrosting mode and the defrosting mode run.
In this embodiment, in order to design the system structure more reasonably, the predetermined position of the main pipeline between the indoor heat exchange device 3 and the throttling component 4 is set in the first main pipeline between the four-way reversing valve 2 and the indoor heat exchange device 3, and then one end of the first branch pipeline is connected to the predetermined position of the main pipeline between the four-way reversing valve 2 and the indoor heat exchange device 3;
or, the main path pipeline preset position between the indoor heat exchange device 3 and the throttling component 4 is arranged on a second main path pipeline between the four-way reversing valve 2 and the exhaust end of the compressor 1, then one end of the first branch pipeline is connected to the second main path pipeline, one end of the first branch pipeline is connected to the main path pipeline preset position between the four-way reversing valve 2 and the exhaust end of the compressor 1, and the other end of the first branch pipeline is connected to the first refrigerant port of the outdoor heat exchange device 5.
Meanwhile, a first stop valve can be arranged on a connecting pipeline between the four-way reversing valve 2 and the indoor heat exchange device 3; and a second stop valve is arranged on a connecting pipeline between the indoor heat exchange device 3 and the throttling part 4.
The air conditioner further comprises a controller, and the controller is electrically connected with the compressor 1, the four-way reversing valve 2, the indoor heat exchange device 3, the outdoor heat exchange device 5, the throttling component 4, the first electromagnetic valve 6, the second electromagnetic valve 7, the third electromagnetic valve 8 and the refrigerant valve 9 respectively. Wherein, the throttling component 4 includes but is not limited to an electronic expansion valve.
With reference to fig. 1, in the refrigerant circulation main loop, an exhaust end of the compressor 1 is communicated with a first end of the four-way reversing valve 2, a second end of the four-way reversing valve 2 is communicated with one end of the indoor heat exchange device 3, and a third end of the four-way reversing valve 2 is communicated with a gas return end of the compressor 1;
the other end of the indoor heat exchange device 3 is communicated with one end of the throttling component 4, the other end of the throttling component 4 is communicated with the second refrigerant port of the outdoor heat exchange device 5, and the first refrigerant port of the outdoor heat exchange device 5 is communicated with the fourth end of the four-way reversing valve 2 through the third electromagnetic valve 8.
Wherein, the compressor 1 compresses a refrigerant at a high temperature and a high pressure;
the four-way reversing valve 2 is used for conveying the refrigerant of the compressor 1 to the indoor heat exchange device 3 in a heating mode or a defrosting mode and recovering the refrigerant of the outdoor heat exchange device 5 to the compressor 1;
the indoor heat exchange device 3 is configured to flow a refrigerant from the compressor 1 through the indoor heat exchange device 3 in a heating mode or a defrosting mode;
the throttle unit 4 that is provided in a main path pipe between the indoor heat exchanger 3 and the outdoor heat exchanger 5 to depressurize the refrigerant;
the outdoor heat exchange device 5 is used for allowing the refrigerant flowing out of the throttling component 4 to flow through the outdoor heat exchange device 5 in the heating mode; the refrigerant flowing from the first branch pipe and/or the second branch pipe passes through the exterior heat exchange device 5 in the defrosting mode.
When the air conditioner constructed as above is operated in the heating mode or the defrosting mode, its operation principle is as follows:
when the heating mode is operated, the indoor heat exchange device 3 is used as a condenser to realize a condensation heat release principle, and the outdoor heat exchange device 5 is used as an evaporator to realize an evaporation heat absorption principle.
As shown in fig. 2, the refrigerant flow path during the heating mode operation is:
the air exhaust end of the compressor 1, the first end of the four-way reversing valve 2, the second end of the four-way reversing valve 2, the first stop valve, the indoor heat exchange device 3, the second stop valve, the throttling component 4, the outdoor heat exchange device 5, the third electromagnetic valve 8, the fourth end of the four-way reversing valve 2, the third end of the four-way reversing valve 2 and the air return end of the compressor 1.
When the defrosting mode is operated, the controller controls the four-way reversing valve 2 not to be switched, and controls the first electromagnetic valve 6 to be conducted, the second electromagnetic valve 7 to be conducted, the third electromagnetic valve 8 to be closed and the external fan to be stopped.
As shown in fig. 3, the refrigerant flow path during the defrosting mode operation is:
one is as follows: the air exhaust end of the compressor 1, the first end of the four-way reversing valve 2, the first branch pipeline (the first electromagnetic valve 6), the outdoor heat exchange device 5, the second branch pipeline, the fourth end of the four-way reversing valve 2, the third end of the four-way reversing valve 2 and the air return end of the compressor 1.
The second step is as follows: the air exhaust end of the compressor 1, the first end of the four-way reversing valve 2, the second end of the four-way reversing valve 2, the first stop valve, the indoor heat exchange device 3, the second stop valve, the throttling component 4, the second branch pipeline (the second electromagnetic valve 7), the fourth end of the four-way reversing valve 2, the third end of the four-way reversing valve 2 and the air return end of the compressor 1.
It should be noted that the first electromagnetic valve 6 is used to control whether the exhaust gas can enter the condenser, and the second electromagnetic valve 7 is used to control the flow rate of the refrigerant of the back pressure machine to increase the system resistance, so as to effectively increase the temperature entering the condenser. And the third electromagnetic valve 8 controls the conduction or the closing of a main pipeline between the four-way reversing valve 2 and the condenser. When the defrosting mode is operated, the first electromagnetic valve 6 is controlled to be conducted, controls the flow distribution of high-temperature and high-pressure gas, and can adjust the flow in the first branch pipeline, so that 1/3-2/3 gas flows into a condenser, the first electromagnetic valve 6 is closed when defrosting is stopped, and at the moment, the flow circulating in the first branch pipeline is 0; the second electromagnetic valve 7 is controlled to be conducted, the flow of the refrigerant returning to the compressor 1 is controlled through adjustment of the opening degree of the valve, the purpose is to increase system resistance, accordingly, the exhaust temperature is kept unchanged continuously, and the second electromagnetic valve 7 is closed when the defrosting is stopped.
Next, the refrigerant valve 9 controls whether the waste heat of the internal unit enters the condenser, and the waste heat of the internal unit enter the condenser together after being collected, so that defrosting is accelerated, and the refrigerant flow path can also have:
and thirdly: the air exhaust end of the compressor 1, the first end of the four-way reversing valve 2, the second end of the four-way reversing valve 2, the first stop valve, the indoor heat exchange device 3, the second stop valve, the third branch pipeline (refrigerant valve 9), the outdoor heat exchange device 5, the second branch pipeline (second electromagnetic valve 7), the fourth end of the four-way reversing valve 2, the third end of the four-way reversing valve 2 and the air return end of the compressor 1.
In this embodiment, the bypass circuit enables the high-temperature and high-pressure gas and the waste heat to flow to the condenser (the outdoor heat exchange device 5) together for heat exchange, so that the condenser is heated, frost is melted after being heated, meanwhile, the third electromagnetic valve 8 is closed and is in a non-conducting state, the second electromagnetic valve 7 acts to conduct and control the refrigerant of the back pressure machine, and the refrigerant is exchanged by the condenser and then returns to the compressor 1 through the second electromagnetic valve 7 to form a closed loop; meanwhile, a small amount of high-temperature gas discharged from the compressor 1 flows to the indoor heat exchange device 3 to blow out hot air.
In addition, when the first electromagnetic valve 6 acts, the compressor 1 is increased in frequency, the exhaust temperature and the waste heat temperature are increased, after the first electromagnetic valve 6, the second electromagnetic valve 7, the third electromagnetic valve 8 and the refrigerant valve 9 act, the control system controls the compressor to continue to operate according to normal heating, and the four-way reversing valve 2 is not switched and is kept in a heating state. The up-conversion operation of the compressor 1 is to increase the exhaust temperature and the waste heat temperature, which is beneficial to rapid defrosting and shortens defrosting time. The 2-minute defrosting technology can be realized.
To sum up, the air conditioner provided by the first embodiment of the present invention has the following beneficial effects:
and the refrigerant part on the main pipeline among the four-way reversing valve 2, the indoor heat exchange device 3 and the throttling component 4 is guided to the outdoor heat exchange device 5 through the first branch pipeline and the third branch pipeline, so that the refrigerant with higher temperature in the borrowed part is used for defrosting of the outdoor heat exchange device 5.
When defrosting of the outdoor heat exchange device 5 is required under low temperature conditions, the four-way reversing valve 2 is not required to be switched, the compressor 1 is not required to be started or stopped, the heating mode is not required to be switched to the cooling mode, at this time, the evaporation and heat absorption functions of the outdoor heat exchange device 5 are stopped, and the main pipeline between the four-way reversing valve 2 and the outdoor heat exchange device 5 is closed through the third electromagnetic valve 8, the bypass circuit inputs the refrigerant with higher temperature in the main refrigerant circulation circuit into the outdoor heat exchanger from the first refrigerant end port of the outdoor heat exchanger 5, the refrigerant flowing out of the second refrigerant port of the outdoor heat exchanger flows back to the compressor 1 through the second solenoid valve 7 and the four-way reversing valve 2, so as to raise the temperature of the outdoor heat exchange device 5, thereby achieving the purpose of rapid defrosting. In addition, the third branch pipeline can be conducted through the refrigerant valve 9, so that the residual heat of the indoor heat exchange device 3 is led into the outdoor heat exchange device 5, and the purpose of defrosting is accelerated.
Through valve member on first branch road pipeline, second branch road pipeline, third branch road pipeline and the pipeline constructs bypass circuit, need not to switch four-way reversing valve 2, change the condition of heating the mode and realize the continuation of indoor set and heat, even also can blow off hot-blastly when changing the frost, satisfy the heat supply demand, improve user's comfort level, and only realize the route switching of refrigerant through 4 valve members moreover to the heat of refrigerant has been utilized effectively and has been changed the frost, and control is simple, and improvement cost is low.
Second embodiment of the invention:
based on the first embodiment, in the second embodiment of the present invention, the refrigerant valve 9 is provided as the fourth solenoid valve 91.
As shown in fig. 4, the fourth electromagnetic valve 91 controls whether the residual heat of the internal unit enters the condenser, and the residual heat of the internal unit both enter the condenser after being collected, so as to accelerate defrosting, and the corresponding refrigerant flow path may further include:
the air exhaust end of the compressor 1, the first end of the four-way reversing valve 2, the second end of the four-way reversing valve 2, the first stop valve, the indoor heat exchange device 3, the second stop valve, the third branch pipeline (the fourth electromagnetic valve 91), the outdoor heat exchange device 5, the second branch pipeline (the second electromagnetic valve 7), the fourth end of the four-way reversing valve 2, the third end of the four-way reversing valve 2 and the air return end of the compressor 1.
When the defrosting mode is operated, the fourth electromagnetic valve 91 is turned on, so that all or part of waste heat from the indoor heat exchange device 3 flows to the outdoor heat exchange device 5, partial waste heat is utilized, defrosting time is accelerated, a defrosting technology can be realized within 2 minutes at the fastest speed, and the fourth electromagnetic valve is turned off when defrosting is stopped.
Third embodiment of the invention:
based on the first embodiment, in the second embodiment of the present invention, the refrigerant valve 9 is configured as a check valve 92, as shown in fig. 5, an inlet end of the check valve 92 is communicated with an inlet end of the third branch pipeline, and an outlet end of the check valve 92 is communicated with an outlet end of the third branch pipeline.
Through whether check valve 92 control internal unit waste heat gets into the condenser, the two get into the condenser together after gathering, change the frost with higher speed, corresponding refrigerant flow path can also have:
the air exhaust end of the compressor 1, the first end of the four-way reversing valve 2, the second end of the four-way reversing valve 2, the first stop valve, the indoor heat exchange device 3, the second stop valve, the third branch pipeline (one-way valve), the outdoor heat exchange device 5, the second branch pipeline (second electromagnetic valve 7), the fourth end of the four-way reversing valve 2, the third end of the four-way reversing valve 2 and the air return end of the compressor 1.
When the defrosting mode is operated, the check valve 92 is switched on, so that all residual heat from the indoor heat exchange device 3 is directly introduced to the outdoor heat exchange device 5 without passing through the throttling component 4, partial residual heat is utilized, defrosting time is accelerated, a 2-minute defrosting technology can be realized, and the check valve is closed when the defrosting is quitted.
The fourth embodiment of the present invention:
referring to fig. 6, the present invention further provides a control method for an air conditioner suitable for the above embodiment, which at least includes the following steps:
s1, when the defrosting condition is met, operating a defrosting mode;
s2, when the defrosting mode is in operation, maintaining the heating operation state of the four-way reversing valve 2, starting the first solenoid valve 6 and the second solenoid valve 7, and closing the third solenoid valve 8 and the fan of the outdoor heat exchanging device 5;
s3, controlling the compressor 1 to be increased from the heating frequency to a preset defrosting frequency when the defrosting mode operates;
s4, when the defrosting exit condition is met, controlling the compressor 1 to reduce the frequency from the preset defrosting frequency to the heating frequency;
in this embodiment, the compressor 1 does not stop and increases the operation frequency, the four-way reversing valve 2 does not switch, and the solenoid valve operates, so that the high-temperature and high-pressure gas and the waste heat enter the cooler condenser together, and the result of rapid defrosting can be realized.
And S5, starting the refrigerant valve 9 when the defrosting mode operates.
In this embodiment, the refrigerant valve 9 may be a fourth electromagnetic valve or a check valve. The first electromagnetic valve 6 and the fourth electromagnetic valve act to control whether exhaust and waste heat are communicated with the condenser, and the second electromagnetic valve 7 controls the flow of the refrigerant of the return pressure machine, so that the system resistance is increased; the third electromagnetic valve 8 is a normally open valve, is closed during defrosting, and enters a defrosting stage. The three valves can act only when defrosting is carried out in a low-temperature area and an ultra-low temperature area, and other temperature areas do not participate in the action.
According to the embodiment of the invention, the compressor does not need to be stopped and the four-way reversing valve does not need to be switched in the heating process, hot air is still blown indoors, so that the comfort level of a room is improved, the system is used in a low-temperature area or an ultra-low temperature area, and other temperature areas are not used. Can realize normal operation in low temperature or extremely low temperature environment. And the heating comfort is greatly improved. The defrosting technology can be realized within 2 minutes, the heating capacity is improved by about 300W per cycle through practice, the indoor unit can continuously blow hot air during heating, and the comfort is improved.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. An air conditioner comprising:
the refrigerant circulation main loop comprises a compressor, a four-way reversing valve, an indoor heat exchange device, an outdoor heat exchange device and a throttling component which are sequentially connected through a main pipeline;
characterized in that, the air conditioner still includes:
a first branch pipe branched from a main pipe predetermined position between a discharge end of the compressor and the indoor heat exchange device and connected to a first refrigerant port of the outdoor heat exchange device; and
a second branch pipe branched from the main pipe between the four-way reversing valve and the first refrigerant port of the outdoor heat exchange device and connected to the second refrigerant port of the outdoor heat exchange device; and
a third branch pipe branched from a predetermined position of the main pipe between the indoor heat exchange device and the throttling part and connected to the first refrigerant port of the outdoor heat exchange device; and
the first electromagnetic valve is arranged on the first branch pipeline and used for adjusting the flow of a refrigerant flowing in the first branch pipeline;
the second electromagnetic valve is arranged on the second branch pipeline and used for adjusting the flow of the refrigerant flowing in the second branch pipeline;
the third electromagnetic valve is arranged on the main pipeline between the second branch pipeline and the first refrigerant port of the outdoor heat exchange device and used for stopping the circulation of the refrigerant when the defrosting mode is operated;
and the refrigerant valve is arranged on the third branch pipeline and used for switching on or off the third branch pipeline when the defrosting mode operates.
2. The air conditioner as claimed in claim 1, wherein the refrigerant valve is a fourth solenoid valve configured to adjust a flow rate of the refrigerant circulating in the third branch pipe in a defrosting mode.
3. The air conditioner as claimed in claim 1, wherein the refrigerant valve is a check valve configured to open or close the third branch pipe in a defrosting mode;
the inlet end of the one-way valve is communicated with the inlet end of the third branch pipeline, and the outlet end of the one-way valve is communicated with the outlet end of the third branch pipeline.
4. The air conditioner according to claim 1, wherein a main path pipe between the indoor heat exchanging arrangement and the throttling part is provided at a predetermined position on a first main path pipe between the four-way reversing valve and the indoor heat exchanging arrangement.
5. The air conditioner according to claim 1, wherein a main path pipe between said indoor heat exchanging means and said throttling part is provided at a predetermined position on a second main path pipe between said four-way reversing valve and a discharge end of said compressor.
6. The air conditioner according to claim 1, wherein in said refrigerant circulation main circuit,
the compressor compresses a refrigerant at a high temperature and a high pressure;
the four-way reversing valve conveys the refrigerant of the compressor to the indoor heat exchange device in a heating mode or a defrosting mode and recovers the refrigerant of the outdoor heat exchange device to the compressor;
the indoor heat exchange device flows through the indoor heat exchange device from a refrigerant of the compressor in a heating mode or a defrosting mode;
the throttling component is arranged on a main pipeline between the indoor heat exchange device and the outdoor heat exchange device so as to decompress the refrigerant;
the outdoor heat exchange device is used for allowing the refrigerant flowing out of the throttling component to flow through the outdoor heat exchange device in the heating mode; and the refrigerant flowing from the first branch pipe and/or the second branch pipe flows through the outdoor heat exchange device in the defrosting mode.
7. The air conditioner of claim 1, further comprising a controller electrically connected to the compressor, the four-way selector valve, the indoor heat exchanging device, the outdoor heat exchanging device, the throttling part, the first solenoid valve, the second solenoid valve, the third solenoid valve, and the refrigerant valve, respectively.
8. The air conditioner according to claim 7, wherein a first cut-off valve is provided on a main pipe between the four-way selector valve and the indoor heat exchanging device, and a second cut-off valve is provided on a main pipe between the indoor heat exchanging device and the throttling part; the first stop valve and the second stop valve are respectively and electrically connected with the controller.
9. A control method of an air conditioner according to any one of claims 1 to 8, characterized by comprising at least the steps of:
when the defrosting condition is met, operating a defrosting mode;
and when the defrosting mode is operated, the heating operation state of the four-way reversing valve is kept, the first electromagnetic valve and the second electromagnetic valve are started, and the third electromagnetic valve and the fan of the outdoor heat exchange device are closed.
10. The control method of an air conditioner according to claim 9, further comprising:
when the defrosting mode is operated, controlling the compressor to increase the heating frequency to a preset defrosting frequency;
and when the defrosting exit condition is met, controlling the compressor to reduce the frequency from the preset defrosting frequency to the heating frequency.
And when the defrosting mode is operated, the refrigerant valve is started or closed.
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| CN111720953A (en) * | 2020-06-05 | 2020-09-29 | 海信（山东）空调有限公司 | Air conditioner and control method thereof |
| CN115950051A (en) * | 2023-01-29 | 2023-04-11 | 宁波奥克斯电气股份有限公司 | Air conditioner defrosting structure and defrosting method thereof |
| CN115950051B (en) * | 2023-01-29 | 2024-07-26 | 宁波奥克斯电气股份有限公司 | Defrosting structure and defrosting method of air conditioner |
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Application publication date: 20200417 |