CN107514683B - Air conditioner and indoor unit self-cleaning control method thereof - Google Patents
Air conditioner and indoor unit self-cleaning control method thereof Download PDFInfo
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- CN107514683B CN107514683B CN201710639786.5A CN201710639786A CN107514683B CN 107514683 B CN107514683 B CN 107514683B CN 201710639786 A CN201710639786 A CN 201710639786A CN 107514683 B CN107514683 B CN 107514683B
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- 238000004140 cleaning Methods 0.000 title claims abstract description 136
- 238000000034 method Methods 0.000 title claims abstract description 86
- 239000003507 refrigerant Substances 0.000 claims abstract description 85
- 238000010257 thawing Methods 0.000 claims abstract description 68
- 238000010438 heat treatment Methods 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 15
- 231100000719 pollutant Toxicity 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims description 49
- 238000005057 refrigeration Methods 0.000 claims description 24
- 238000009751 slip forming Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 description 9
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000000428 dust Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000014759 maintenance of location Effects 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
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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
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G13/00—Appliances or processes not covered by groups F28G1/00 - F28G11/00; Combinations of appliances or processes covered by groups F28G1/00 - F28G11/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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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)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides an air conditioner and an indoor unit self-cleaning control method thereof, wherein an indoor unit heat exchange assembly of the air conditioner comprises: the control method comprises the following steps of connecting a first indoor heat exchanger and a second indoor heat exchanger in series, wherein the second indoor heat exchanger is connected to a compressor through a refrigerant flow direction switching device, an electronic expansion valve is arranged between the first indoor heat exchanger and the second indoor heat exchanger, and the control method comprises the following steps: receiving a trigger signal for starting a self-cleaning function of the air conditioner; adjusting the refrigerant flow direction switching device to a state that the compressor provides compressed refrigerant for the indoor unit heat exchange assembly; the first indoor heat exchanger is firstly cooled and then heated by adjusting the opening degree of the electronic expansion valve, so that the surface of the first indoor heat exchanger is continuously frosted in the cooling stage, defrosting is carried out in the heating stage, and water formed by defrosting is used for removing attached pollutants, so that self-cleaning of the first indoor heat exchanger is realized. The scheme of the invention avoids the severe fluctuation of the temperature and brings better use experience to users.
Description
Technical Field
The invention relates to a household air conditioner, in particular to an air conditioner and an indoor unit self-cleaning control method thereof.
Background
After the air conditioner is placed or used for a long time, a large amount of dust and dirt exists in the room. The dust and dirt are attached to a heat exchanger of the indoor unit, so that on one hand, the heat exchange performance of the heat exchanger is reduced, the performance of the air conditioner is reduced, and the energy consumption is improved; on the other hand, the dust and dirt are easy to be attached to breed bacteria and form mildew, and the bacteria and the mildew can generate peculiar smell in the unit, if the peculiar smell is not cleaned in time, the health of the air conditioner user is seriously threatened.
The scheme that traditional air conditioner took generally washs for the regular time, has brought serious inconvenience for the user uses, consequently in order to solve the above-mentioned problem that brings that adheres to dirt on the heat exchanger of air conditioner, prior art has appeared and has produced the comdenstion water when utilizing the heat exchanger to use as the evaporimeter, takes away the technical means of the dirt on heat exchanger surface through the comdenstion water, realizes the automatically cleaning of air conditioner indoor machine heat exchanger.
However, the above-mentioned scheme of cleaning the heat exchanger of the indoor unit of the air conditioner by using the condensed water may affect normal refrigeration or heating of the air conditioner in the actual use process, for example, in the heating process, the indoor temperature fluctuates, discomfort is brought to the user, and the user experience is affected.
Disclosure of Invention
An object of the present invention is to provide an air conditioner having a self-cleaning function and a control method thereof, which solve at least some of the above technical problems.
A further object of the invention is to reduce the large fluctuations of the temperature caused by self-cleaning during heating.
According to one aspect of the present invention, there is provided a self-cleaning control method for an indoor unit of an air conditioner, wherein a refrigeration system of the air conditioner includes an indoor unit heat exchange assembly, a refrigerant flow direction switching device, a compressor, an outdoor unit heat exchange assembly, and a throttling device, which are sequentially connected in series by a refrigerant pipeline, wherein the indoor unit heat exchange assembly includes: the control method comprises the following steps of connecting a first indoor heat exchanger and a second indoor heat exchanger in series, wherein the second indoor heat exchanger is connected to a compressor through a refrigerant flow direction switching device, an electronic expansion valve is arranged between the first indoor heat exchanger and the second indoor heat exchanger, and the control method comprises the following steps: receiving a trigger signal for starting a self-cleaning function of the air conditioner; adjusting the refrigerant flow direction switching device to a state that the compressor provides compressed refrigerant for the indoor unit heat exchange assembly; the first indoor heat exchanger is firstly cooled and then heated by adjusting the opening degree of the electronic expansion valve, so that the surface of the first indoor heat exchanger is continuously frosted in the cooling stage, defrosting is carried out in the heating stage, and water formed by defrosting is used for removing attached pollutants, so that self-cleaning of the first indoor heat exchanger is realized.
Optionally, the step of adjusting the opening degree of the electronic expansion valve to make the first indoor heat exchanger cool before heat includes: detecting the temperature of the first indoor heat exchanger; adjusting the opening degree of the electronic expansion valve according to the temperature of the first indoor heat exchanger, so that the temperature of the first indoor heat exchanger is reduced to a first set temperature; keeping the opening degree of the electronic expansion valve when the temperature of the first indoor heat exchanger is reduced to a first set temperature, and continuously frosting the surface of the first indoor heat exchanger until a set first defrosting condition is met; after the first defrosting condition is met, the opening degree of the electronic expansion valve is opened to the maximum, and the first indoor heat exchanger releases heat to defrost.
Optionally, the first defrosting condition comprises: the temperature of the first indoor heat exchanger is lowered to a second set temperature or the time for which the opening degree of the electronic expansion valve is maintained exceeds a first set time, and the second set temperature is lower than the first set temperature.
Optionally, after the first indoor heat exchanger completes self-cleaning, the method further includes: adjusting the refrigerant flow direction switching device to a state that the compressor provides compressed refrigerant for the outdoor unit heat exchange assembly; the opening degree of the electronic expansion valve is adjusted, so that the second indoor heat exchanger is refrigerated and continuously frosted on the surface of the second indoor heat exchanger; after the preset second defrosting condition is met, the refrigerant flow direction switching device is adjusted to a state that the compressor provides compressed refrigerant for the indoor unit heat exchange assembly, the opening degree of the electronic expansion valve is opened to the maximum, the second indoor heat exchanger releases heat, and water formed by defrosting is used for removing attached pollutants, so that self-cleaning of the second indoor heat exchanger is realized.
Optionally, the step of cooling the second indoor heat exchanger by adjusting an opening degree of the electronic expansion valve includes: detecting the temperature of the second indoor heat exchanger; adjusting the opening degree of the electronic expansion valve according to the temperature of the second indoor heat exchanger, so that the temperature of the second indoor heat exchanger is reduced to a third set temperature; and keeping the opening degree of the electronic expansion valve when the temperature of the second indoor heat exchanger is reduced to a third set temperature, and continuously frosting the surface of the second indoor heat exchanger until a second defrosting condition is met.
Optionally, the second defrosting condition comprises: the temperature of the second indoor heat exchanger is reduced to a fourth set temperature or the time for keeping the opening degree of the electronic expansion valve exceeds a second set time; the fourth set temperature is lower than the third set temperature.
Optionally, after receiving a trigger signal for turning on the self-cleaning function of the air conditioner, the method further comprises: measuring the working environment temperature of an indoor unit of an air conditioner; when the working environment temperature is lower than a fifth set temperature, the electronic expansion valve is placed in a controlled state, and the process that the first indoor heat exchanger performs cooling firstly and then performs heating is executed; and when the working environment temperature is higher than the fifth set temperature, the initial opening state of the electronic expansion valve is kept, and the integral self-cleaning process of the heat exchange assembly of the indoor unit is executed.
According to another aspect of the present invention, there is also provided an air conditioner including a refrigeration system and a self-cleaning controller, wherein the refrigeration system includes: indoor set heat transfer subassembly, refrigerant flow direction auto-change over device, compressor, off-premises station heat transfer subassembly and throttling arrangement that are concatenated in proper order by the refrigerant pipeline, wherein the indoor set heat transfer subassembly includes: the system comprises a first indoor heat exchanger and a second indoor heat exchanger which are connected in series, wherein the second indoor heat exchanger is connected to a compressor through a refrigerant flow direction switching device, and an electronic expansion valve is arranged between the first indoor heat exchanger and the second indoor heat exchanger; a self-cleaning controller electrically connected to the refrigeration system and configured to: receiving a trigger signal for starting a self-cleaning function of the air conditioner; adjusting the refrigerant flow direction switching device to a state that the compressor provides compressed refrigerant for the indoor unit heat exchange assembly; the first indoor heat exchanger is firstly cooled and then heated by adjusting the opening degree of the electronic expansion valve, so that the surface of the first indoor heat exchanger is continuously frosted in the cooling stage, defrosting is carried out in the heating stage, and water formed by defrosting is used for removing attached pollutants, so that self-cleaning of the first indoor heat exchanger is realized.
Optionally, the self-cleaning controller is further configured to: detecting the temperature of the first indoor heat exchanger; adjusting the opening degree of the electronic expansion valve according to the temperature of the first indoor heat exchanger, so that the temperature of the first indoor heat exchanger is reduced to a first set temperature; keeping the opening degree of the electronic expansion valve when the temperature of the first indoor heat exchanger is reduced to a first set temperature, and continuously frosting the surface of the first indoor heat exchanger until a set first defrosting condition is met; after satisfying first defrosting condition, make electronic expansion valve's aperture open to the biggest, make first indoor heat exchanger release heat to defrosting, first defrosting condition includes: the temperature of the first indoor heat exchanger is lowered to a second set temperature or the time for which the opening degree of the electronic expansion valve is maintained exceeds a first set time, and the second set temperature is lower than the first set temperature.
Optionally, the self-cleaning controller is further configured to: after the first indoor heat exchanger finishes self-cleaning, the refrigerant flow direction switching device is adjusted to a state that the compressor provides compressed refrigerant for the outdoor heat exchange assembly; detecting the temperature of the second indoor heat exchanger; adjusting the opening degree of the electronic expansion valve according to the temperature of the second indoor heat exchanger, so that the temperature of the second indoor heat exchanger is reduced to a third set temperature; keeping the opening degree of the electronic expansion valve when the temperature of the second indoor heat exchanger is reduced to a third set temperature, and continuously frosting the surface of the second indoor heat exchanger until a preset second defrosting condition is met; after satisfying second frost removal condition, adjust refrigerant flow direction auto-change over device to the compressor and provide the state of compression refrigerant to indoor set heat exchange assemblies to make electronic expansion valve's aperture open to the biggest, make the second indoor heat exchanger release the heat, utilize the water that the frost formed to walk adnexed pollutant, realize the automatically cleaning of second indoor heat exchanger, second frost removal condition includes: the temperature of the second indoor heat exchanger is reduced to a fourth set temperature or the time for keeping the opening degree of the electronic expansion valve exceeds a second set time; the fourth set temperature is lower than the third set temperature.
Optionally, the self-cleaning controller is further configured to: after receiving a trigger signal for starting a self-cleaning function of the air conditioner, measuring the working environment temperature of an indoor unit of the air conditioner; when the working environment temperature is lower than a fifth set temperature, the electronic expansion valve is placed in a controlled state, and the process that the first indoor heat exchanger performs cooling firstly and then performs heating is executed; and when the working environment temperature is higher than the fifth set temperature, the initial opening state of the electronic expansion valve is kept, and the integral self-cleaning process of the heat exchange assembly of the indoor unit is executed.
The air conditioner and the indoor unit self-cleaning control method thereof are particularly suitable for improving the structure of the heat exchange assembly of the indoor unit when the air conditioner runs in a heating state, the first indoor heat exchanger and the second indoor heat exchanger which are connected in series are arranged, the electronic expansion valve is additionally arranged between the first indoor heat exchanger and the second indoor heat exchanger, and the first indoor heat exchanger and the second indoor heat exchanger respectively execute self-cleaning processes by adjusting the flow direction of refrigerant and the opening degree of the electronic expansion valve.
Further, the air conditioner and the indoor unit self-cleaning control method thereof optimize the self-cleaning processes of the first indoor heat exchanger and the second indoor heat exchanger, so that the consumed time is less, and the self-cleaning effect is better.
Furthermore, the air conditioner and the indoor unit self-cleaning control method thereof can determine a self-cleaning scheme according to the working environment of the indoor unit, and select the integral self-cleaning of the heat exchange assembly of the indoor unit or the self-cleaning of the first indoor heat exchanger and the second indoor heat exchanger respectively, so that the self-cleaning process and the power consumption are saved under the condition of ensuring the comfort of a user.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic functional block diagram of an air conditioner according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of a refrigeration system of an air conditioner according to one embodiment of the present invention;
fig. 3 is a schematic view illustrating an indoor unit self-cleaning control method of an air conditioner according to an embodiment of the present invention;
fig. 4 is a flowchart for implementing self-cleaning of a first indoor heat exchanger in a self-cleaning control method of an indoor unit of an air conditioner according to an embodiment of the present invention;
fig. 5 is a flowchart for implementing self-cleaning of a second indoor heat exchanger in an indoor unit self-cleaning control method of an air conditioner according to an embodiment of the present invention; and
fig. 6 is a flowchart illustrating an embodiment of a method for controlling self-cleaning of an indoor unit of an air conditioner according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic functional block diagram of an air conditioner 10 according to one embodiment of the present invention. Fig. 2 is a schematic diagram of a refrigeration system of the air conditioner 10 according to one embodiment of the present invention.
The air conditioner 10 generally includes an air conditioner indoor unit 100 and an air conditioner outdoor unit 200, and the air conditioner indoor unit 100 and the air conditioner outdoor unit 200 complete cooling and heating cycles of the air conditioner through efficient cooperation, so as to achieve cooling and heating adjustment of indoor temperature. The refrigeration system of the air conditioner 10 may be implemented using a compression refrigeration cycle, which uses a compression phase change cycle of a refrigerant in the compressor 250, the condenser, the evaporator, and the throttling device 240 to implement heat transfer. The refrigeration system may further include a refrigerant flow direction switching device 260 to change the flow direction of the refrigerant, so that the indoor unit heat exchange assembly 110 alternately serves as an evaporator or a condenser to achieve a cooling or heating function, and the refrigerant flow direction switching device 260 is generally implemented by a four-way valve.
The working principle of the compression refrigeration cycle is as follows: the compressor 250 is a power of a refrigeration cycle, is driven by a motor to rotate continuously, and not only timely extracts vapor in the evaporator to maintain low temperature and low pressure, but also improves the pressure and temperature of refrigerant vapor through compression action to create a condition for transferring the heat of the refrigerant vapor to an external environment medium. I.e., compressing the low temperature, low pressure refrigerant vapor to a high temperature, high pressure state.
The condenser is a heat exchange device and is used for taking away heat of high-temperature and high-pressure refrigeration steam from the compressor 250 by utilizing an environment cooling refrigerant, so that the high-temperature and high-pressure refrigeration steam is cooled and condensed into high-pressure and normal-temperature refrigeration liquid.
The refrigerant liquid with high pressure and normal temperature is directly sent into the evaporator, and the pressure of the refrigerant liquid is reduced according to the corresponding principle of saturation pressure and saturation temperature, so that the temperature of the refrigerant liquid is reduced. The refrigerant liquid with high pressure and normal temperature passes through the throttling device 240 to obtain low-temperature and low-pressure refrigerant, and then is sent into the evaporator for heat absorption and evaporation. A capillary tube may be generally employed as the throttling device 240 in the air conditioner 10.
The evaporator is also a heat exchange device. The throttled low-temperature and low-pressure refrigerant liquid is evaporated (boiled) therein to become vapor, and absorbs ambient heat to lower the ambient temperature.
The refrigerant flow direction switching device 260 is configured to switch a flow direction of a refrigerant in a compression refrigeration cycle, for example, in a heating process of the air conditioner 10, the compressor 250 provides the compressed refrigerant to the indoor heat exchange assembly 110, the indoor heat exchange assembly 110 is used as a condenser, the refrigerant is condensed by the indoor heat exchange assembly 110 and then sent to the outdoor heat exchange assembly 210 through the throttling device 240, and the outdoor heat exchange assembly 210 absorbs external heat and then sends the refrigerant to the compressor 250 again. In the refrigeration process of the air conditioner 10, the compressor 250 provides a compressed refrigerant to the outdoor heat exchange assembly 210, the outdoor heat exchange assembly 210 is used as a condenser, the refrigerant is condensed by the outdoor heat exchange assembly 210 and then sent to the indoor heat exchange assembly 110 through the throttling device 240, the indoor heat exchange assembly 110 absorbs external heat to cool surrounding air, the effects of cooling and dehumidifying the air are achieved, and then the refrigerant is sent to the compressor 250 again.
In addition, the indoor fan 120 and the outdoor fan 220 in the refrigeration system generate air flows that exchange heat with the indoor heat exchange assembly 110 and the outdoor heat exchange assembly 210, respectively.
Since the air conditioner 10 may accumulate dust on the indoor unit heat exchange assembly 110 and the outdoor unit heat exchange assembly 210 during the use and placement process, the air conditioner 10 is a potential pollution source in the environment, for example, in some tests, it is found that the pollution level of the indoor unit heat exchange assembly 110 which is not cleaned for a long time is very surprising, which may cause great health risks to users. Based on the above problems, in the self-cleaning technology in the prior art, the dirt is stripped off from the evaporator by frosting to rapidly break up the dust and dirt, and then the defrosted water washes the indoor unit heat exchange assembly 110 to achieve the purpose of cleaning, in the actual implementation process of the technology, the indoor unit heat exchange assembly 110 needs to be firstly made to collect the moisture in the surrounding environment, which inevitably needs to make the indoor unit heat exchange assembly 110 work in the evaporator state. If the indoor unit 100 of the air conditioner outputs cold air, the temperature of the working environment is reduced, and uncomfortable feeling is brought to users.
The air conditioner 10 of the present embodiment takes the following structural improvements in view of the above problems: the indoor unit heat exchange unit 110 includes: the first indoor heat exchanger 111 and the second indoor heat exchanger 112 are connected in series, wherein the second indoor heat exchanger 112 is connected to the compressor 250 through the refrigerant flow direction switching device 260, and the electronic expansion valve 130 is disposed between the first indoor heat exchanger 111 and the second indoor heat exchanger 112. The first indoor heat exchanger 111 is communicated to the outdoor heat exchange assembly 210 through the throttling device 240. The electronic expansion valve 130 is kept in an open state in the normal working process, so that the refrigeration or heating is not affected, and the opening degree of the electronic expansion valve 130 can be controllably adjusted in the self-cleaning process.
The air conditioner 10 of this embodiment further includes a self-cleaning controller 150, and the self-cleaning controller 150 may be implemented by an original control board of the air conditioner 10 by configuring a self-cleaning control program or by presetting a self-cleaning control logic, and since the hardware structure of the self-cleaning controller 150 is well known by those skilled in the art, it is not described herein again.
The self-cleaning controller 150 performs the self-cleaning control process as follows: receiving a trigger signal for starting a self-cleaning function of the air conditioner 10 (for example, receiving a self-cleaning control instruction issued by a user through a remote controller or a human-computer interaction interface of the air conditioner 10, or receiving a trigger instruction generated when the air conditioner 10 determines that self-cleaning is required according to a working state of the air conditioner 10); after receiving the trigger signal, the refrigerant flow direction switching device 260 is adjusted to a state where the compressor 250 provides the compressed refrigerant to the indoor unit heat exchange assembly 110 (i.e. switched to the heating state of the air conditioner 10, and if the indoor unit heat exchange assembly is in the heating state, the state is maintained); by adjusting the opening degree of the electronic expansion valve 130, the first indoor heat exchanger 111 is cooled and then heated, so that the surface of the first indoor heat exchanger is continuously frosted in the cooling stage, defrosting is performed in the heating stage, and water formed by defrosting is used for removing attached pollutants, so that self-cleaning of the first indoor heat exchanger 111 is realized.
The self-cleaning controller 150 adjusts the opening of the electronic expansion valve 130, so that the process of first cooling and then heating the first indoor heat exchanger 111 specifically includes: detecting a temperature of the first indoor heat exchanger 111 (e.g., a coil temperature of the first indoor heat exchanger 111); adjusting an opening degree of the electronic expansion valve 130 according to the temperature of the first indoor heat exchanger 111 such that the temperature of the first indoor heat exchanger 111 is lowered to a first set temperature; keeping the opening degree of the electronic expansion valve 130 when the temperature of the first indoor heat exchanger 111 is reduced to a first set temperature, and continuously frosting the surface of the first indoor heat exchanger 111 until a set first defrosting condition is met; after the first defrosting condition is satisfied, the opening degree of the electronic expansion valve 130 is opened to the maximum, and the first indoor heat exchanger 111 releases heat to defrost. The first defrosting condition includes: the temperature of the first indoor heat exchanger 111 is decreased to a second set temperature lower than the first set temperature or the time during which the opening degree of the electronic expansion valve 130 is maintained exceeds the first set time.
After the opening degree of the electronic expansion valve 130 is adjusted, a throttling function can be realized, so that the high-temperature and high-pressure refrigerant vapor is cooled in the second indoor heat exchanger 112, and then is throttled by the electronic expansion valve 130 to obtain a low-temperature and low-pressure refrigerant, which is equivalent to that the first heat exchanger and the outdoor heat exchange assembly 210 are jointly used as an evaporator to perform refrigeration at the moment, so that the first heat exchanger condenses moisture in the surrounding air, and frosts the surface of the first heat exchanger.
After the temperature of the first indoor heat exchanger 111 is decreased to the first set temperature, the electronic expansion valve 130 maintains the current opening degree, so that the surface of the first indoor heat exchanger 111 continues to frost until the set first defrosting condition is met (the temperature of the first indoor heat exchanger 111 is decreased to the second set temperature or the time for maintaining the opening degree of the electronic expansion valve 130 exceeds the first set time). After the first defrosting condition described above is satisfied, it can be considered that the first heat exchanger has finished frosting. And the compressor 250 may maintain its operation frequency inconvenient and turn off the indoor and outdoor fans 120 and 220 during the first heat exchanger frosting process.
After determining that the first defrosting condition is reached, the self-cleaning controller 150 opens the opening degree of the electronic expansion valve 130 to the maximum (the opening speed needs to be as fast as possible), so that the first indoor heat exchanger 111 is changed to operate in a condenser state, heat is released to defrost, and water formed by defrosting is used to remove attached pollutants, thereby realizing self-cleaning of the first indoor heat exchanger 111.
In the above process, the second indoor heat exchanger 112 can be kept in a heating state, so that the influence of the first indoor heat exchanger 111 on the surrounding environment is effectively reduced, and the discomfort brought to the user by outputting cold air is avoided.
After completing the self-cleaning process of the first indoor heat exchanger 111, the self-cleaning controller 150 may further continue to perform the self-cleaning process of the second indoor heat exchanger 112, which specifically includes: the refrigerant flow direction switching device is adjusted to a state where the compressor 250 supplies the compressed refrigerant to the outdoor unit heat exchange assembly 210 (corresponding to a cooling state of the air conditioner 10); detecting the temperature of the second indoor heat exchanger 112; adjusting the opening degree of the electronic expansion valve 130 according to the temperature of the second indoor heat exchanger 112 such that the temperature of the second indoor heat exchanger 112 is lowered to a third set temperature; keeping the opening degree of the electronic expansion valve 130 when the temperature of the second indoor heat exchanger 112 is reduced to a third set temperature, so that the surface of the second indoor heat exchanger 112 continuously frosts until a preset second defrosting condition is met; after the second defrosting condition is met, the refrigerant flow direction switching device is adjusted to a state that the compressor 250 provides compressed refrigerant for the indoor unit heat exchange assembly 110, the opening degree of the electronic expansion valve 130 is opened to the maximum, the second indoor heat exchanger 112 releases heat, and water formed by defrosting is used for removing attached pollutants, so that the second indoor heat exchanger 112 is self-cleaned, and the second defrosting condition comprises: the temperature of the second indoor heat exchanger 112 is decreased to the fourth set temperature or the time during which the opening degree of the electronic expansion valve 130 is maintained exceeds the second set time; the fourth set temperature is lower than the third set temperature.
Therefore, in the self-cleaning process of the second indoor heat exchanger 112, the process is similar to the self-cleaning process of the first indoor heat exchanger 111, that is, the electronic expansion valve 130 is used to achieve the throttling function, so that the first indoor heat exchanger 111 is kept to continuously generate heat in the state, and the influence of the second indoor heat exchanger 112 on the surrounding environment is reduced.
In the self-cleaning process, the first set temperature, the second set temperature, the third set temperature, and the fourth set temperature may be obtained by testing according to the actual specification and the operating environment of the air conditioner 10, for example, the first set temperature and the third set temperature may be set to-5 ℃, and the second set temperature and the fourth set temperature may be set to-15 ℃ (in the case that the values are 20 ℃ both indoors and outdoors, the result obtained by testing a specific air conditioner may be adjusted within a certain range according to the situation in specific implementation). The first setting time and the second setting time can be set correspondingly, so that the first indoor heat exchanger 111 or the second indoor heat exchanger 112 cannot reach the second setting temperature and the fourth setting temperature under special working conditions.
In addition, the self-cleaning controller 150 may also determine an end condition of the self-cleaning process according to the temperature of the first indoor heat exchanger 111 or the second indoor heat exchanger 112, for example, when the duration of the defrosting stage of the first indoor heat exchanger 111 or the second indoor heat exchanger 112 exceeds a set defrosting time or the temperature of the first indoor heat exchanger 111 or the second indoor heat exchanger 112 reaches a set defrosting temperature (e.g., 50 ℃), it is determined that the self-cleaning is completed. After the self-cleaning is completed, the indoor fan 120 may supply air to dry the indoor heat exchange assembly 110.
In the self-cleaning process, the flow path of the refrigerant needs to be switched many times and the compressor 250 needs to be started and stopped, which may cause extra energy consumption, so that the self-cleaning controller 150 may first measure the working environment temperature of the indoor unit 100 of the air conditioner after receiving the trigger signal for the air conditioner 10 to start the self-cleaning function; when the working environment temperature is lower than the fifth set temperature, the electronic expansion valve 130 is placed in a controlled state, and a process of first cooling and then heating of the first indoor heat exchanger 111 is performed; when the working environment temperature is higher than the fifth set temperature, the initial opening state of the electronic expansion valve 130 is maintained, and the overall self-cleaning process of the indoor unit heat exchange assembly 110 is performed. For example, when the fifth set temperature is set to 26 ℃, it is considered that the influence of the overall self-cleaning of the indoor unit heat exchange assembly 110 on the ambient temperature is not enough to cause discomfort to the user in the environment higher than 26 ℃, and thus the overall self-cleaning of the indoor unit heat exchange assembly 110 is possible. If the ambient temperature is lower than 26 ℃, the above-described processes of self-cleaning the first indoor heat exchanger 111 and the second indoor heat exchanger 112, respectively, may be performed. It should be noted that the setting of the fifth setting temperature to 26 ℃ is only an example, and in the specific implementation of the present embodiment, the fifth setting temperature may be set according to the actual experience of the user.
An embodiment of the present invention further provides a self-cleaning control method for an indoor unit 100 of an air conditioner 10, where the self-cleaning control method for an indoor unit 100 of an air conditioner 10 is used for performing self-cleaning control on the air conditioner 10 in the foregoing embodiment and may be executed by a self-cleaning controller 150 in the foregoing embodiment, fig. 3 is a schematic diagram of a self-cleaning control method for an indoor unit 100 of an air conditioner 10 according to an embodiment of the present invention, and the self-cleaning control method for an indoor unit 100 of an air conditioner 10 may generally include:
step S302, receiving a trigger signal for the air conditioner 10 to start the self-cleaning function, for example, receiving a self-cleaning control command issued by a user through a remote controller or a human-computer interaction interface of the air conditioner 10, or receiving a trigger command generated by the air conditioner 10 to determine that self-cleaning is required according to its working state.
Step S304, adjusting the refrigerant flow direction switching device 260 to a state that the compressor 250 provides the compressed refrigerant to the indoor unit heat exchange assembly 110, that is, to a heating state of the air conditioner 10, and if the state is already in the heating state, maintaining the state;
step S306, by adjusting the opening of the electronic expansion valve 130, the first indoor heat exchanger 111 is cooled and then heated, so that the surface of the first indoor heat exchanger is continuously frosted in the cooling stage, and is defrosted in the heating stage, and the water formed by defrosting is used to remove the attached pollutants, thereby implementing self-cleaning of the first indoor heat exchanger 111.
Fig. 4 is a flowchart of implementing self-cleaning of the first indoor heat exchanger 111 in the self-cleaning control method of the indoor unit 100 of the air conditioner 10 according to an embodiment of the present invention, and the flowchart shows the working process of step S306, which specifically includes:
in step S402, the temperature of the first indoor heat exchanger 111 is detected, for example, by obtaining the coil temperature of the first indoor heat exchanger 111.
Step S404, adjusting the opening degree of the electronic expansion valve 130 according to the temperature of the first indoor heat exchanger 111, so that the temperature of the first indoor heat exchanger 111 is reduced to a first set temperature;
step S406, maintaining the opening degree of the electronic expansion valve 130 when the temperature of the first indoor heat exchanger 111 drops to the first set temperature, so that the surface of the first indoor heat exchanger 111 continuously frosts until a set first defrosting condition is met, where the first defrosting condition includes: the temperature of the first indoor heat exchanger 111 is decreased to a second set temperature lower than the first set temperature or the time during which the opening degree of the electronic expansion valve 130 is maintained exceeds the first set time.
In step S408, after the first defrosting condition is satisfied, the opening degree of the electronic expansion valve 130 is opened to the maximum, and the first indoor heat exchanger 111 releases heat to defrost.
After the first indoor heat exchanger 111 completes self-cleaning, the self-cleaning control method for the indoor unit 100 of the air conditioner 10 according to the embodiment may further perform self-cleaning on the second indoor heat exchanger 112. The specific process is as follows: the refrigerant flow direction switching device 260 is adjusted to a state where the compressor 250 provides the compressed refrigerant to the outdoor unit heat exchange assembly 210 (corresponding to switching to the cooling state of the air conditioner 10); the second indoor heat exchanger 112 is cooled by adjusting the opening degree of the electronic expansion valve 130, and frost is continuously formed on the surface thereof; after the preset second defrosting condition is met, the refrigerant flow direction switching device is adjusted to a state that the compressor 250 provides compressed refrigerant for the indoor unit heat exchange assembly 110, the opening degree of the electronic expansion valve 130 is opened to the maximum, the second indoor heat exchanger 112 releases heat, and water formed by defrosting is used for removing attached pollutants, so that the second indoor heat exchanger 112 is self-cleaned, wherein the second defrosting condition comprises: the temperature of the second indoor heat exchanger 112 is decreased to the fourth set temperature or the time during which the opening degree of the electronic expansion valve 130 is maintained exceeds the second set time; the fourth set temperature is lower than the third set temperature.
Fig. 5 is a flowchart illustrating a self-cleaning process of the second indoor heat exchanger 112 in the self-cleaning control method of the indoor unit 100 of the air conditioner 10 according to an embodiment of the present invention, where the self-cleaning process of the second indoor heat exchanger 112 includes:
step S502, detecting the temperature of the second indoor heat exchanger 112;
step S504 of adjusting the opening degree of the electronic expansion valve 130 according to the temperature of the second indoor heat exchanger 112, so that the temperature of the second indoor heat exchanger 112 is decreased to a third set temperature;
step S506, keeping the opening degree of the electronic expansion valve 130 when the temperature of the second indoor heat exchanger 112 is decreased to the third set temperature, so that the surface of the second indoor heat exchanger 112 continuously frosts until the second defrosting condition is met;
step S508, after the second defrosting condition is met, adjusting the refrigerant flow direction switching device 260 to a state where the compressor 250 provides compressed refrigerant to the indoor unit heat exchange assembly 110;
step S508, the opening degree of the electronic expansion valve 130 is opened to the maximum, so that the second indoor heat exchanger 112 releases heat, and the water formed by defrosting is used to remove attached pollutants, thereby implementing self-cleaning of the second indoor heat exchanger 112.
Therefore, in the self-cleaning process of the second indoor heat exchanger 112, the process is similar to the self-cleaning process of the first indoor heat exchanger 111, that is, the electronic expansion valve 130 is used to achieve the throttling function, so that the first indoor heat exchanger 111 is kept to continuously generate heat in the state, and the influence of the second indoor heat exchanger 112 on the surrounding environment is reduced.
In order to avoid frequent switching of the refrigerant flow direction switching device 260 and the start-stop of the compressor 250 when unnecessary, the working environment temperature of the indoor unit 100 of the air conditioner may be first measured after receiving the trigger signal for the air conditioner 10 to start the self-cleaning function; when the working environment temperature is lower than the fifth set temperature, the electronic expansion valve 130 is placed in a controlled state, and a process of first cooling and then heating of the first indoor heat exchanger 111 is performed; when the working environment temperature is higher than the fifth set temperature, the initial opening state of the electronic expansion valve 130 is maintained, and the overall self-cleaning process of the indoor unit heat exchange assembly 110 is performed. For example, when the fifth set temperature is set to 26 ℃, it is considered that the influence of the overall self-cleaning of the indoor unit heat exchange assembly 110 on the ambient temperature is not enough to cause discomfort to the user in the environment higher than 26 ℃, and thus the overall self-cleaning of the indoor unit heat exchange assembly 110 is possible. If the ambient temperature is lower than 26 ℃, the above-described processes of self-cleaning the first indoor heat exchanger 111 and the second indoor heat exchanger 112, respectively, may be performed. It should be noted that the setting of the fifth setting temperature to 26 ℃ is only an example, and in the specific implementation of the present embodiment, the fifth setting temperature may be set according to the actual experience of the user.
In the self-cleaning process, the first set temperature, the second set temperature, the third set temperature, and the fourth set temperature may be obtained by testing according to the actual specification and the operating environment of the air conditioner 10, for example, the first set temperature and the third set temperature may be set to-5 ℃, and the second set temperature and the fourth set temperature may be set to-15 ℃ (in the case that the values are 20 ℃ both indoors and outdoors, the result obtained by testing a specific air conditioner 10 may be adjusted within a certain range according to the situation in specific implementation). The first setting time and the second setting time can be set correspondingly, so that the first indoor heat exchanger 111 or the second indoor heat exchanger 112 cannot reach the second setting temperature and the fourth setting temperature under special working conditions.
In addition, the self-cleaning controller 150 may also determine an end condition of the self-cleaning process according to the temperature of the first indoor heat exchanger 111 or the second indoor heat exchanger 112, for example, when the duration of the defrosting stage of the first indoor heat exchanger 111 or the second indoor heat exchanger 112 exceeds a set defrosting time or the temperature of the first indoor heat exchanger 111 or the second indoor heat exchanger 112 reaches a set defrosting temperature (e.g., 50 ℃), it is determined that the self-cleaning is completed. After the self-cleaning is completed, the indoor fan 120 may be caused to supply air to dry the indoor heat exchanger assembly.
Take the first set temperature and the third set temperature as-5 deg.C, the second set temperature and the fourth set temperature as-15 deg.C, the defrosting temperature as 50 deg.C, the first set time and the second set time as 10 minutes, and the fifth set temperature as 26 deg.C as an example. Describing the process of completing the whole indoor unit heat exchange assembly 110, fig. 6 is a flowchart of an embodiment of a method for controlling self-cleaning of an indoor unit of an air conditioner 10 according to an embodiment of the present invention, where the flowchart includes:
step S602, in the heating process of the air conditioner 10, receiving a trigger signal for starting the self-cleaning function of the air conditioner 10;
step S604, obtaining the environment temperature of the working environment of the indoor unit 100, and judging whether the environment temperature is higher than 26 ℃, if so, executing step S640, and executing the integral self-cleaning process of the heat exchange assembly 110 of the indoor unit;
step S606, when the ambient temperature is lower than 26 ℃, adjusting the refrigerant flow direction switching device to a state where the compressor 250 provides compressed refrigerant to the indoor unit heat exchange assembly 110, that is, keeping the heating state of the air conditioner 10;
step S608, the indoor fan 120 and the outdoor fan 220 are stopped, and the compressor 250 is operated at a preset target frequency (the preset target frequency is selected according to indoor and outdoor temperatures, for example, the preset target frequency may be set to 40Hz under the condition that the indoor temperature and the outdoor temperature are both 20 ℃);
step S610, detecting the coil temperature TP1 of the first indoor heat exchanger 111, reducing the opening degree of the electronic expansion valve 130, and gradually reducing TP1 to-5 ℃;
step S612, keeping the opening degree of the electronic expansion valve 130 when the TP1 is reduced to-5 ℃ so as to continuously frost the surface of the first indoor heat exchanger 111;
step S614, judging whether TP1 is reduced to-15 ℃;
step S616, judging that the opening continuous keeping time of the electronic expansion valve 130 exceeds 10 minutes;
step 618, when any one of the conditions that the temperature of TP1 is reduced to-15 ℃ and the opening duration retention time exceeds 10 minutes is met, opening the electronic expansion valve 130 at the fastest speed to enable the first indoor heat exchanger 111 to release heat for defrosting;
step S620, judging whether TP1 reaches defrosting temperature of 50 ℃;
step S622, the first indoor heat exchanger 111 finishes self-cleaning;
in step S624, the refrigerant flow direction switching device (four-way valve) 260 is switched, and the coil temperature TP2 of the second indoor heat exchanger 112 is detected;
step S626, reducing the opening degree of the electronic expansion valve 130 to enable TP2 to gradually drop to-5 ℃;
step S628, maintaining the opening degree of the electronic expansion valve 130 when TP2 is decreased to-5 ℃, so as to continuously frost the surface of the second indoor heat exchanger 112;
step S630, judging whether TP2 is reduced to-15 ℃;
step S632 of determining that the opening degree continuous retention time of the electronic expansion valve 130 exceeds 10 minutes;
step S634, when any one of the conditions that TP2 falls to-15 ℃ and the opening duration retention time exceeds 10 minutes is satisfied, reversing the refrigerant flow direction switching device (four-way valve) 260 again, opening the electronic expansion valve 130, and releasing heat from the second indoor heat exchanger 112 to defrost;
step S636, judging whether TP2 reaches defrosting temperature of 50 ℃;
in step S638, the second indoor heat exchanger 112 ends self-cleaning.
In the process of implementing the method, the specific judgment threshold value may be adjusted according to the specification of the air conditioner 10, the operating environment, and the user's habit, and the specific value is only an example.
The self-cleaning control method for the indoor unit 100 of the air conditioner 10 in this embodiment is particularly suitable for performing the self-cleaning process by the first indoor heat exchanger 111 and the second indoor heat exchanger 112 respectively when the air conditioner 10 is in a heating state, and compared with the self-cleaning process performed by the whole indoor unit heat exchange assembly 110 in the prior art, the self-cleaning control method reduces the influence on the working environment temperature, prevents the temperature from being fluctuated severely, and brings better use experience to users.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (9)
1. A self-cleaning control method for an indoor unit of an air conditioner is disclosed, wherein a refrigeration system of the air conditioner comprises an indoor unit heat exchange assembly, a refrigerant flow direction switching device, a compressor, an outdoor unit heat exchange assembly and a throttling device which are sequentially connected in series through a refrigerant pipeline, wherein the indoor unit heat exchange assembly comprises: a first indoor heat exchanger and a second indoor heat exchanger connected in series, wherein the second indoor heat exchanger is connected to the compressor through the refrigerant flow direction switching device, an electronic expansion valve is provided between the first indoor heat exchanger and the second indoor heat exchanger, and the control method includes:
receiving a trigger signal for starting a self-cleaning function of the air conditioner;
adjusting the refrigerant flow direction switching device to a state that the compressor provides compressed refrigerant for the indoor unit heat exchange assembly;
the opening degree of the electronic expansion valve is adjusted, so that the first indoor heat exchanger is firstly cooled and then heated, the surface of the first indoor heat exchanger is continuously frosted in the cooling stage, defrosting is carried out in the heating stage, and water formed by defrosting is used for removing attached pollutants, so that self-cleaning of the first indoor heat exchanger is realized;
the step of adjusting the opening degree of the electronic expansion valve to enable the first indoor heat exchanger to cool before heating comprises the following steps:
detecting the temperature of the first indoor heat exchanger;
adjusting the opening degree of the electronic expansion valve according to the temperature of the first indoor heat exchanger, so that the temperature of the first indoor heat exchanger is reduced to a first set temperature;
keeping the opening degree of the electronic expansion valve when the temperature of the first indoor heat exchanger is reduced to the first set temperature, and continuously frosting the surface of the first indoor heat exchanger until the set first defrosting condition is met;
and after the first defrosting condition is met, opening the opening degree of the electronic expansion valve to the maximum, and enabling the first indoor heat exchanger to release heat so as to defrost.
2. The control method according to claim 1, wherein
The first defrosting condition includes: the temperature of the first indoor heat exchanger is reduced to a second set temperature or the time for maintaining the opening degree of the electronic expansion valve exceeds a first set time, and the second set temperature is lower than the first set temperature.
3. The control method according to claim 1, further comprising, after the first indoor heat exchanger completes self-cleaning:
adjusting the refrigerant flow direction switching device to a state that the compressor provides compressed refrigerant for the outdoor unit heat exchange assembly;
the opening degree of the electronic expansion valve is adjusted, so that the second indoor heat exchanger is refrigerated, and frost is continuously formed on the surface of the second indoor heat exchanger;
and after a preset second defrosting condition is met, adjusting the refrigerant flow direction switching device to a state that the compressor provides compressed refrigerant for the indoor unit heat exchange assembly, opening the opening of the electronic expansion valve to the maximum, enabling the second indoor heat exchanger to release heat, and utilizing water formed by defrosting to remove attached pollutants to realize self-cleaning of the second indoor heat exchanger.
4. The control method according to claim 3, wherein the step of cooling the second indoor heat exchanger by adjusting an opening degree of the electronic expansion valve includes:
detecting the temperature of the second indoor heat exchanger;
adjusting the opening degree of the electronic expansion valve according to the temperature of the second indoor heat exchanger, so that the temperature of the second indoor heat exchanger is reduced to a third set temperature;
and keeping the opening degree of the electronic expansion valve when the temperature of the second indoor heat exchanger is reduced to a third set temperature, and continuously frosting the surface of the second indoor heat exchanger until the second defrosting condition is met.
5. The control method according to claim 4, wherein
The second frost removal condition includes: the temperature of the second indoor heat exchanger is reduced to a fourth set temperature or the time for maintaining the opening degree of the electronic expansion valve exceeds a second set time; the fourth set temperature is lower than the third set temperature.
6. The control method of claim 3, further comprising, after receiving a trigger signal for the air conditioner to turn on a self-cleaning function:
measuring the working environment temperature of the indoor unit of the air conditioner;
when the working environment temperature is lower than a fifth set temperature, the electronic expansion valve is placed in a controlled state, and the process that the first indoor heat exchanger refrigerates firstly and then heats is executed;
and when the working environment temperature is higher than a fifth set temperature, maintaining the initial opening state of the electronic expansion valve, and executing the integral self-cleaning process of the heat exchange assembly of the indoor unit.
7. An air conditioner comprises a refrigeration system and a self-cleaning controller, wherein
The refrigeration system includes: indoor set heat transfer subassembly, refrigerant flow direction auto-change over device, compressor, off-premises station heat transfer subassembly and throttling arrangement that are connected in series in proper order by the refrigerant pipeline, wherein indoor set heat transfer subassembly includes: the refrigerant flow direction switching device is connected with the compressor, and an electronic expansion valve is arranged between the first indoor heat exchanger and the second indoor heat exchanger;
the self-cleaning controller is electrically connected with the refrigeration system and is configured to: receiving a trigger signal for starting a self-cleaning function of the air conditioner; adjusting the refrigerant flow direction switching device to a state that the compressor provides compressed refrigerant for the indoor unit heat exchange assembly; the opening degree of the electronic expansion valve is adjusted, so that the first indoor heat exchanger is firstly cooled and then heated, the surface of the first indoor heat exchanger is continuously frosted in the cooling stage, defrosting is carried out in the heating stage, and water formed by defrosting is used for removing attached pollutants, so that self-cleaning of the first indoor heat exchanger is realized;
the self-cleaning controller is further configured to:
detecting the temperature of the first indoor heat exchanger;
adjusting the opening degree of the electronic expansion valve according to the temperature of the first indoor heat exchanger, so that the temperature of the first indoor heat exchanger is reduced to a first set temperature;
keeping the opening degree of the electronic expansion valve when the temperature of the first indoor heat exchanger is reduced to the first set temperature, and continuously frosting the surface of the first indoor heat exchanger until the set first defrosting condition is met;
after the first defrosting condition is met, opening the opening degree of the electronic expansion valve to the maximum, and enabling the first indoor heat exchanger to release heat so as to defrost, wherein the first defrosting condition comprises: the temperature of the first indoor heat exchanger is reduced to a second set temperature or the time for maintaining the opening degree of the electronic expansion valve exceeds a first set time, and the second set temperature is lower than the first set temperature.
8. The air conditioner of claim 7, wherein the self-cleaning controller is further configured to:
after the first indoor heat exchanger finishes self-cleaning, the refrigerant flow direction switching device is adjusted to a state that the compressor provides compressed refrigerant for the outdoor heat exchange assembly;
detecting the temperature of the second indoor heat exchanger; adjusting the opening degree of the electronic expansion valve according to the temperature of the second indoor heat exchanger, so that the temperature of the second indoor heat exchanger is reduced to a third set temperature; keeping the opening degree of the electronic expansion valve when the temperature of the second indoor heat exchanger is reduced to a third set temperature, and continuously frosting the surface of the second indoor heat exchanger until a preset second defrosting condition is met;
after the second defrosting condition is met, the refrigerant flow direction switching device is adjusted to a state that the compressor provides compressed refrigerant for the indoor unit heat exchange assembly, the opening degree of the electronic expansion valve is opened to the maximum, the second indoor heat exchanger releases heat, and water formed by defrosting is used for removing attached pollutants to realize self-cleaning of the second indoor heat exchanger, wherein the second defrosting condition comprises: the temperature of the second indoor heat exchanger is reduced to a fourth set temperature or the time for maintaining the opening degree of the electronic expansion valve exceeds a second set time; the fourth set temperature is lower than the third set temperature.
9. The air conditioner of claim 7, wherein the self-cleaning controller is further configured to:
after receiving a trigger signal for starting a self-cleaning function of the air conditioner, measuring the working environment temperature of an indoor unit of the air conditioner;
when the working environment temperature is lower than a fifth set temperature, the electronic expansion valve is placed in a controlled state, and the process that the first indoor heat exchanger refrigerates firstly and then heats is executed;
and when the working environment temperature is higher than a fifth set temperature, maintaining the initial opening state of the electronic expansion valve, and executing the integral self-cleaning process of the heat exchange assembly of the indoor unit.
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| CN201710639786.5A CN107514683B (en) | 2017-07-31 | 2017-07-31 | Air conditioner and indoor unit self-cleaning control method thereof |
| PCT/CN2018/096851 WO2019024722A1 (en) | 2017-07-31 | 2018-07-24 | Air conditioner and self-cleaning control method for indoor unit thereof |
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| CN201710639786.5A CN107514683B (en) | 2017-07-31 | 2017-07-31 | Air conditioner and indoor unit self-cleaning control method thereof |
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| CN107514683A (en) | 2017-12-26 |
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