CN108413572B - Self-cleaning control method for air conditioner - Google Patents
Self-cleaning control method for air conditioner Download PDFInfo
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- CN108413572B CN108413572B CN201810152059.0A CN201810152059A CN108413572B CN 108413572 B CN108413572 B CN 108413572B CN 201810152059 A CN201810152059 A CN 201810152059A CN 108413572 B CN108413572 B CN 108413572B
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The invention belongs to the technical field of air conditioners and aims to solve the problem that the conventional air conditioner cannot execute different self-cleaning modes on an outdoor unit according to judgment conditions. To this end, the present invention provides a self-cleaning control method for an air conditioner including an outdoor unit and a compressor, the self-cleaning control method including: acquiring fan current of an outdoor unit, and exhaust temperature and return temperature of a compressor; and executing a corresponding self-cleaning mode on the outdoor unit according to the current of the fan of the outdoor unit, the exhaust temperature of the compressor and the return temperature of the compressor. The invention enables the air conditioner to select the optimal self-cleaning mode according to the self-dust-deposition degree on the basis of the over-low exhaust temperature and the over-low return temperature of the compressor, thereby enabling the self-cleaning operation of the air conditioner to be more intelligent and flexible, and avoiding the situations of excessive energy waste and poor cleaning effect of the air conditioner due to the poor correspondence of the self-cleaning mode.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly provides a self-cleaning control method for an air conditioner.
Background
Compared with the indoor unit of the air conditioner, the outdoor unit of the air conditioner is always arranged outdoors (particularly on the outer wall of a building), and the accumulation speed of dust is obviously higher than that of the indoor unit, so that the outdoor unit of the air conditioner needs to be cleaned in time.
In the prior art, the cleaning mode of the air conditioner comprises manual cleaning and self-cleaning of the air conditioner, time and labor are wasted by adopting the manual cleaning, all parts of the air conditioner need to be disassembled and cleaned, and all the parts need to be reassembled after the cleaning is finished. Therefore, many air conditioners have adopted a self-cleaning mode, for example, patent publication No. CN107525209A discloses a self-cleaning control method for an air conditioner, which specifically includes detecting a current operation mode of the air conditioner, and if the current operation mode of the air conditioner is a non-cooling mode, adjusting the air conditioner to a cooling mode; detecting the rotating speed of a motor of an indoor unit fan of the air conditioner and a first current value of the motor under the rotating speed; and comparing the first current value of the motor at the rotating speed with a first preset current value at the rotating speed, and if the first current value is less than or equal to the first preset current value, starting a self-cleaning mode of the air conditioner and executing self-cleaning treatment of the heat exchanger of the indoor unit. That is, the above patent uses the fan current of the indoor unit to determine whether to perform self-cleaning of the indoor unit, the specific self-cleaning modes are consistent and cannot perform self-cleaning of the outdoor unit, even if the outdoor unit of the air conditioner uses the above determination mode of the indoor unit, the air conditioner cannot perform different self-cleaning modes on the outdoor unit according to the determination conditions, which results in that the air conditioner uniformly cleans the outdoor unit according to the same self-cleaning mode when the outdoor unit is slightly dusty and seriously dusty, and the air conditioner only needs to perform short self-cleaning when the outdoor unit is slightly dusty, but if the air conditioner still performs the self-cleaning mode according to the serious dusty, energy waste is caused to a certain extent.
Therefore, there is a need in the art for a self-cleaning control method for an air conditioner to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the conventional air conditioner cannot execute different self-cleaning modes on an outdoor unit according to a judgment condition, the present invention provides a self-cleaning control method for an air conditioner, the air conditioner includes an outdoor unit and a compressor, the self-cleaning control method includes: acquiring fan current of an outdoor unit, and exhaust temperature and return temperature of a compressor; and executing a corresponding self-cleaning mode on the outdoor unit according to the current of the fan of the outdoor unit, the exhaust temperature of the compressor and the return temperature of the compressor.
In the preferred technical solution of the above self-cleaning control method, the step of executing a corresponding self-cleaning mode to the outdoor unit according to the fan current of the outdoor unit, the discharge temperature of the compressor and the return temperature of the compressor includes: and if the difference value between the exhaust temperature of the compressor and the standard exhaust temperature is smaller than a first preset temperature value, the difference value between the return temperature of the compressor and the standard return temperature is smaller than a second preset temperature value, and the fan current of the outdoor unit is smaller than a first preset current value and larger than a second preset current value, executing a first self-cleaning mode on the outdoor unit, wherein the first preset current value is larger than the second preset current value.
In a preferred embodiment of the above self-cleaning control method, "execute a corresponding self-cleaning mode on the outdoor unit according to a fan current of the outdoor unit and a discharge temperature of the compressor" further includes: and if the difference value between the exhaust temperature of the compressor and the standard exhaust temperature is smaller than a first preset temperature value, the difference value between the return temperature of the compressor and the standard return temperature is smaller than a second preset temperature value, and the fan current of the outdoor unit is smaller than or equal to a second preset current value and larger than a third preset current value, executing a second self-cleaning mode on the outdoor unit, wherein the second preset current value is larger than the third preset current value.
In a preferred embodiment of the above self-cleaning control method, "execute a corresponding self-cleaning mode on the outdoor unit according to a fan current of the outdoor unit and a discharge temperature of the compressor" further includes: and if the difference value between the discharge temperature of the compressor and the standard discharge temperature is less than a first preset temperature value, the difference value between the return temperature of the compressor and the standard return temperature is less than a second preset temperature value, and the fan current of the outdoor unit is less than or equal to a third preset current value, executing a third self-cleaning mode on the outdoor unit.
In a preferred embodiment of the above self-cleaning control method, the cleaning intensity of the third self-cleaning mode is greater than the cleaning intensity of the second self-cleaning mode, and the cleaning intensity of the second self-cleaning mode is greater than the cleaning intensity of the first self-cleaning mode.
In a preferred technical solution of the above self-cleaning control method, the self-cleaning control method further includes: the air conditioner is operated in a clean state, and a first preset current value is measured.
In a preferred technical solution of the above self-cleaning control method, the self-cleaning control method further includes: the air conditioner was operated in a slightly dusty state, and a second preset current value was measured.
In a preferred technical solution of the above self-cleaning control method, the self-cleaning control method further includes: the air conditioner is operated in a heavily dusted state, and a third preset current value is measured.
In a preferred technical solution of the above self-cleaning control method, the self-cleaning control method further includes: and if the running time of the air conditioner reaches the preset time, executing a self-cleaning mode on the outdoor unit.
In the preferable technical scheme of the self-cleaning control method, the first preset temperature value and the second preset temperature value are both-3 ℃.
As can be understood by those skilled in the art, in a preferred embodiment of the present invention, when the air conditioner is operated, the outdoor unit is automatically cleaned by determining the current of the outdoor unit and the discharge temperature and the return temperature of the compressor, and then performing a corresponding self-cleaning mode according to the current of the outdoor unit, the discharge temperature of the compressor, and the return temperature of the compressor. Specifically, if the discharge temperature of the compressor is not low or the return air temperature of the compressor is not low, the self-cleaning mode is not performed; if the exhaust temperature of the compressor is too low and the return temperature of the compressor is also too low, and when the current attenuation degree of the fan of the outdoor unit is low, the air conditioner is slightly dusted, and the air conditioner is preferably cleaned by adopting a first self-cleaning mode; if the exhaust temperature of the compressor is too low and the return temperature of the compressor is also too low, and when the current attenuation degree of the fan of the outdoor unit is slightly high, the air conditioner is moderate in dust deposition, and the air conditioner is preferably cleaned in a second self-cleaning mode; if the discharge temperature of the compressor is too low and the return temperature of the compressor is also too low, and when the current attenuation of the outdoor unit fan is high, which indicates that the air conditioner is seriously dusted, the air conditioner should adopt the third self-cleaning mode for cleaning. Through the control mode, the air conditioner can select the optimal self-cleaning mode according to the self-dust-deposition degree on the basis of the over-low exhaust temperature and the over-low return temperature of the compressor, and compared with the technical scheme that the air conditioner can only uniformly execute the same self-cleaning mode according to judgment conditions in the prior art, the self-cleaning method and the self-cleaning system of the air conditioner have the advantages that the self-cleaning operation of the air conditioner is more intelligent and flexible, and the situations of excessive energy waste and poor cleaning effect of the air conditioner due to poor correspondence of the self-cleaning mode are avoided.
Furthermore, on the basis of the control mode, the invention further provides a control mode for judging whether the self-cleaning mode is executed or not by judging whether the running time of the air conditioner reaches the preset time or not, and by the control mode, the time for entering the self-cleaning mode can be still judged by the running time of the air conditioner when the fault occurs in the exhaust temperature sensor for detecting the exhaust temperature of the compressor and/or the return temperature sensor for detecting the return temperature of the compressor and/or the fan current of the outdoor unit, so that the situation that the self-cleaning mode is not executed all the time because the air conditioner cannot execute the self-cleaning mode by the first control mode is avoided.
In addition, the air conditioner further provided on the basis of the technical scheme of the invention adopts the self-cleaning control method, so that the air conditioner has the technical effect of the self-cleaning control method, and compared with the existing air conditioner, the air conditioner provided by the invention can select the optimal self-cleaning mode according to the self-dust-deposition degree on the basis that the exhaust temperature of the compressor is too low and the return temperature of the compressor is also too low, so that the self-cleaning operation of the air conditioner is more intelligent, and the situations of excessive energy waste and poor cleaning effect of the air conditioner are avoided.
Drawings
FIG. 1 is a flow chart of a self-cleaning control method of the present invention;
fig. 2 is a flow chart of an embodiment of the self-cleaning control method of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
The problem that the existing air conditioner can not execute different self-cleaning modes to the outdoor unit according to the judgment condition is pointed out based on the background technology. The invention provides a self-cleaning control method for an air conditioner, aiming at preventing the air conditioner from frequently executing a self-cleaning mode due to misjudgment caused by the fluctuation of the current of a fan of an outdoor unit.
Specifically, the air conditioner of the present invention includes an outdoor unit and a compressor, and as shown in fig. 1, the self-cleaning control method of the present invention includes: acquiring fan current of an outdoor unit, and exhaust temperature and return temperature of a compressor; and executing a corresponding self-cleaning mode on the outdoor unit according to the current of the fan of the outdoor unit, the exhaust temperature of the compressor and the return temperature of the compressor. The exhaust temperature of the compressor can be obtained through the exhaust temperature sensor, and the return temperature of the compressor can be obtained through the return temperature sensor. It should be noted that the current of the fan of the outdoor unit can directly reflect the dust deposition degree of the air conditioner, because the load of the fan is determined at a certain rotation speed, when the load of the fan is increased at the same rotation speed, and accordingly, the current of the fan is decreased, it is indicated that the wind resistance of the fan is increased, that is, the dust deposition on the outdoor unit is performed, and the more the dust deposition is, the smaller the current of the fan is, so the dust deposition degree of the outdoor unit of the air conditioner can be fully determined according to the current of the fan.
In practical application, the fan currents of the outdoor units with different dust formation degrees can be measured in an experimental mode before the air conditioner leaves a factory, namely, the air conditioner is operated in a clean state, and a first preset current value is measured; operating the air conditioner in a slight ash formation state, and measuring a second preset current value; the air conditioner is operated in a heavily dusted state, and a third preset current value is measured. The skilled person can flexibly set the degree of dust formation of the air conditioner according to the actual situation, for example, the degree of dust formation can be distinguished according to the thickness of the dust layer on the air conditioner, the air conditioner is set to be slightly dust-formed when the thickness of the dust layer is 0.5 to 1 mm, the air conditioner is set to be moderately dust-formed when the thickness of the dust layer is 1 to 2 mm, the air conditioner is set to be severely dust-formed when the thickness of the dust layer is more than 2 mm or an ash net is formed, and the fan current corresponding to the measurement in each case can be divided into sections by such a setting mode. If the current of the fan of the outdoor unit is equal to the first preset current value, the air conditioner is not dusted, and the air conditioner does not need to perform self-cleaning; if the current of the fan of the outdoor unit is smaller than a first preset current value and larger than a second preset current value, the air conditioner is slightly grayed; if the current of the fan of the outdoor unit is smaller than the second preset current value and larger than the third preset current value, the condition that the air conditioner is moderately dusted is indicated; if the current of the fan of the outdoor unit is smaller than a third preset current value, the air conditioner is proved to be seriously gray, wherein the first preset current value is larger than the second preset current value, and the second preset current value is larger than the third preset current value. A person skilled in the art can flexibly set specific values of the first preset current value, the second preset current value and the third preset current value in practical application, as long as the ash deposition degree of the air conditioner can be distinguished through a demarcation point determined by the first preset current value, the second preset current value and the third preset current value, so that the air conditioner can select an optimal self-cleaning mode.
Preferably, as shown in fig. 2, the step of performing a corresponding self-cleaning mode on the outdoor unit according to the magnitude of the fan current of the outdoor unit, the discharge temperature of the compressor, and the return temperature of the compressor includes: and if the difference value between the exhaust temperature of the compressor and the standard exhaust temperature is smaller than a first preset temperature value, the difference value between the return temperature of the compressor and the standard return temperature is smaller than a second preset temperature value, and the fan current of the outdoor unit is smaller than a first preset current value and larger than a second preset current value, executing a first self-cleaning mode on the outdoor unit, wherein the first preset current value is larger than the second preset current value. Since the air conditioner is lightly dusted at this time, when the air conditioner performs the first self-cleaning mode, the air speed of the outdoor unit can be properly reduced by adjusting the frequency of the compressor, and the outdoor unit can be self-cleaned in a short time.
Preferably, as shown in fig. 2, the step of performing a corresponding self-cleaning mode on the outdoor unit according to the magnitude of the fan current of the outdoor unit and the discharge temperature of the compressor further includes: and if the difference value between the exhaust temperature of the compressor and the standard exhaust temperature is smaller than a first preset temperature value, the difference value between the return temperature of the compressor and the standard return temperature is smaller than a second preset temperature value, and the fan current of the outdoor unit is smaller than or equal to a second preset current value and larger than a third preset current value, executing a second self-cleaning mode on the outdoor unit, wherein the second preset current value is larger than the third preset current value. Since the air conditioner is moderately dusted at this time, when the air conditioner performs the second self-cleaning mode, the air speed of the outdoor unit can be moderate by adjusting the frequency of the compressor, and the outdoor unit is self-cleaned in moderate time.
Preferably, as shown in fig. 2, the step of performing a corresponding self-cleaning mode on the outdoor unit according to the magnitude of the fan current of the outdoor unit and the discharge temperature of the compressor further includes: and if the difference value between the discharge temperature of the compressor and the standard discharge temperature is less than a first preset temperature value, the difference value between the return temperature of the compressor and the standard return temperature is less than a second preset temperature value, and the fan current of the outdoor unit is less than or equal to a third preset current value, executing a third self-cleaning mode on the outdoor unit. Since the air conditioner is seriously dusted at this time, when the air conditioner performs the third self-cleaning mode, the air speed of the outdoor unit can be increased by adjusting the frequency of the compressor, and the outdoor unit is self-cleaned for a long time.
Preferably, the cleaning intensity of the third self-cleaning mode is greater than the cleaning intensity of the second self-cleaning mode, which is greater than the cleaning intensity of the first self-cleaning mode. The cleaning intensity can be adjusted and distinguished by controlling the wind speed of the outdoor unit and controlling the self-cleaning time.
In an embodiment of the present invention, the standard discharge temperature of the compressor may be measured before the air conditioner leaves a factory, that is, the air conditioner is in a completely clean state, so that the air conditioner operates under a standard working condition, and during the operation of the air conditioner under the standard working condition, the standard discharge temperatures of the compressors corresponding to the fans of the outdoor unit at different rotation speeds are measured. In the above embodiment, the first preset temperature value may be-3 ℃, and a person skilled in the art may flexibly set the first preset temperature value in practical application as long as whether the discharge temperature of the compressor is too low can be determined by setting the first preset temperature value.
Similarly to the above, the standard return air temperature of the compressor may be measured before the air conditioner leaves the factory, that is, the air conditioner is in a completely clean state, so that the air conditioner operates under a standard working condition, and in the process of operating the air conditioner under the standard working condition, the standard return air temperatures of the compressors corresponding to the fans of the outdoor unit at different rotation speeds are measured. In the above embodiment, the second preset temperature value may be-3 ℃, and a person skilled in the art may flexibly set the second preset temperature value in practical application as long as whether the return air temperature of the compressor is too low can be determined by setting the second preset temperature value.
Preferably, the self-cleaning control method of the present invention further comprises: and if the running time of the air conditioner reaches the preset time, executing a self-cleaning mode on the outdoor unit. The skilled person can set the preset time through an experimental manner, or can set the preset time through an empirical manner, as long as the air conditioner can execute the self-cleaning mode through the demarcation point determined by the preset time. For example, the preset time may be 10h (hours), that is, when the operation time of the air conditioner reaches 10h, the air conditioner automatically performs the self-cleaning mode immediately.
In another aspect, the air conditioner of the present invention further includes a controller configured to be able to perform the above-described self-cleaning control method. This air conditioner can make the air conditioner select the optimum automatically cleaning mode according to the ash deposition degree of self on the basis that the exhaust temperature of compressor is crossed lowly and the return air temperature of compressor is also crossed lowly, makes the automatically cleaning operation of air conditioner more intelligent, avoids the air conditioner to appear the too much extravagant and not good condition of clean effect of the energy simultaneously.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (5)
1. A self-cleaning control method for an air conditioner including an outdoor unit and a compressor, the self-cleaning control method comprising:
acquiring fan current of the outdoor unit, and exhaust temperature and return temperature of the compressor;
executing a first self-cleaning mode on the outdoor unit if the difference value between the discharge temperature of the compressor and the standard discharge temperature is smaller than a first preset temperature value, the difference value between the return temperature of the compressor and the standard return temperature is smaller than a second preset temperature value, and the fan current of the outdoor unit is smaller than a first preset current value and larger than a second preset current value;
executing a second self-cleaning mode on the outdoor unit if the difference value between the discharge temperature of the compressor and the standard discharge temperature is less than a first preset temperature value, the difference value between the return temperature of the compressor and the standard return temperature is less than a second preset temperature value, and the fan current of the outdoor unit is less than or equal to a second preset current value and greater than a third preset current value;
executing a third self-cleaning mode on the outdoor unit if the difference between the discharge temperature of the compressor and the standard discharge temperature is less than a first preset temperature value, the difference between the return temperature of the compressor and the standard return temperature is less than a second preset temperature value, and the fan current of the outdoor unit is less than or equal to a third preset current value;
the first preset current value is larger than the second preset current value, the second preset current value is larger than the third preset current value, the cleaning intensity of the third self-cleaning mode is larger than the cleaning intensity of the second self-cleaning mode, and the cleaning intensity of the second self-cleaning mode is larger than the cleaning intensity of the first self-cleaning mode.
2. The self-cleaning control method according to claim 1, further comprising:
and operating the air conditioner in a clean state, and measuring the first preset current value.
3. The self-cleaning control method according to claim 1, further comprising:
and operating the air conditioner in a slightly ash-forming state, and measuring the second preset current value.
4. The self-cleaning control method according to claim 1, further comprising:
and operating the air conditioner in a severe ash formation state, and measuring the third preset current value.
5. The self-cleaning control method of any one of claims 2 to 4, wherein the first preset temperature value and the second preset temperature value are both-3 degrees Celsius.
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| CN201810152059.0A CN108413572B (en) | 2018-02-14 | 2018-02-14 | Self-cleaning control method for air conditioner |
| PCT/CN2019/074968 WO2019158085A1 (en) | 2018-02-14 | 2019-02-13 | Self-cleaning control method for air conditioner, and air conditioner |
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| CN201810152059.0A CN108413572B (en) | 2018-02-14 | 2018-02-14 | Self-cleaning control method for air conditioner |
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| CN108413572B true CN108413572B (en) | 2021-04-20 |
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| WO2019158085A1 (en) * | 2018-02-14 | 2019-08-22 | 青岛海尔空调器有限总公司 | Self-cleaning control method for air conditioner, and air conditioner |
| CN110966705B (en) * | 2018-09-28 | 2021-07-23 | 重庆海尔空调器有限公司 | Heat exchanger, control method and device and air conditioner |
| CN110736192B (en) * | 2019-09-30 | 2022-06-03 | 重庆海尔空调器有限公司 | Control method and device for self-cleaning of air conditioner and air conditioner |
| CN113390161A (en) * | 2020-03-12 | 2021-09-14 | 青岛海尔空调电子有限公司 | Air-cooled heat pump hot water air conditioning unit and control method thereof |
| CN113639411B (en) * | 2021-07-15 | 2023-03-21 | 青岛海尔空调器有限总公司 | Method for controlling external self-cleaning of outdoor heat exchanger |
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| CN105371415B (en) * | 2014-08-21 | 2018-02-06 | 广东美的制冷设备有限公司 | Air-conditioner outdoor unit and its dirty blocking control method |
| CN104729016A (en) * | 2015-03-13 | 2015-06-24 | 广东美的暖通设备有限公司 | Dust removal method and device applied to air conditioner outdoor heat exchanger |
| CN105004013A (en) * | 2015-08-04 | 2015-10-28 | 珠海格力电器股份有限公司 | Air-conditioning indoor unit filter screen filth blockage detection method and air-conditioning system control method |
| CN106016597A (en) * | 2016-05-25 | 2016-10-12 | 广东美的暖通设备有限公司 | Air conditioner and control method and device thereof |
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| CN106382709B (en) * | 2016-08-26 | 2019-04-09 | 珠海格力电器股份有限公司 | The dirty stifled detection method of filter screen of air conditioner and system and air conditioner |
| CN106705376B (en) * | 2017-01-04 | 2020-02-04 | 青岛海尔空调器有限总公司 | Self-cleaning method for indoor unit of air conditioner |
| CN107525209A (en) * | 2017-07-13 | 2017-12-29 | 青岛海尔空调器有限总公司 | Air conditioner automatically cleaning control method and device |
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| CN102538082A (en) * | 2011-12-05 | 2012-07-04 | Tcl空调器(中山)有限公司 | Air conditioner external unit with self-cleaning function |
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