CN110762709A - Self-cleaning control method for air conditioner - Google Patents

Self-cleaning control method for air conditioner Download PDF

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Publication number
CN110762709A
CN110762709A CN201810848785.6A CN201810848785A CN110762709A CN 110762709 A CN110762709 A CN 110762709A CN 201810848785 A CN201810848785 A CN 201810848785A CN 110762709 A CN110762709 A CN 110762709A
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CN
China
Prior art keywords
heat exchanger
outdoor
self
air conditioner
outdoor heat
Prior art date
Application number
CN201810848785.6A
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Chinese (zh)
Inventor
罗荣邦
许文明
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青岛海尔空调器有限总公司
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Priority to CN201810848785.6A priority Critical patent/CN110762709A/en
Publication of CN110762709A publication Critical patent/CN110762709A/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41Defrosting; Preventing freezing
    • F24F11/42Defrosting; Preventing freezing of outdoor units
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/65Electronic processing for selecting an operating mode
    • F24F11/67Switching between heating and cooling modes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00Details or features not otherwise provided for
    • F24F2221/22Cleaning ducts or apparatus

Abstract

The invention belongs to the technical field of air conditioners and aims to solve the problems that the self-cleaning control mode of the existing air conditioner is generally low in frosting speed, so that the whole self-cleaning time is long and the normal experience of a user is influenced. Therefore, the invention provides a self-cleaning control method for an air conditioner, the air conditioner comprises a refrigerant circulating system and a solution circulating system, and the self-cleaning control method comprises the following steps: under the refrigeration working condition, the compressor is subjected to frequency reduction, and the four-way valve is reversed; reducing the rotating speed of an outdoor fan of the air conditioner and increasing the voltage of the indoor solution film and the voltage of the outdoor solution film so as to frost the outdoor heat exchanger; after the outdoor heat exchanger frosts, the electronic expansion valve is closed firstly, and the electromagnetic valve at the low-pressure side of the compressor is closed after the preset time; and heating the outdoor heat exchanger, so that the outdoor heat exchanger is defrosted and cleaned. The invention can improve the self-cleaning efficiency of the outdoor heat exchanger and improve the user experience.

Description

Self-cleaning control method for air conditioner

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

The air conditioner is a device capable of refrigerating/heating indoors, dust deposits on an indoor unit and an outdoor unit of the air conditioner can be gradually increased along with the lapse of time, a large amount of bacteria can be bred after the dust deposits accumulate to a certain degree, particularly, the outdoor unit is exposed outdoors for a long time, so that external dust and bacteria are easily adhered to the outdoor unit, the heat exchange efficiency of the air conditioner can be seriously affected by the bacteria and the dust, the energy consumption of the air conditioner is increased, the service life of the air conditioner is shortened, and 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 at present adopt a self-cleaning manner, for example, the air conditioner can be self-cleaned by means of frosting and defrosting, however, the existing self-cleaning control manner generally has a slow frosting speed, so that the whole self-cleaning time is long, and the normal experience of users is affected.

Therefore, there is a need in the art for a new 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, i.e. to solve the problem that the self-cleaning control mode of the existing air conditioner is generally slow in frosting speed, thereby causing the problems that the whole self-cleaning time is long and the normal experience of users is influenced, the invention provides a self-cleaning control method for an air conditioner, the air conditioner comprises an indoor heat exchanger, an outdoor heat exchanger, a compressor, an electronic expansion valve and a four-way valve, wherein the indoor heat exchanger, the electronic expansion valve, the outdoor heat exchanger, the compressor and the four-way valve form a closed-loop refrigerant circulating system, the air conditioner also comprises an indoor solution film, an outdoor solution film, a liquid pump and a liquid storage tank, wherein the indoor solution film is arranged on the indoor heat exchanger, the outdoor solution film is arranged on the outdoor heat exchanger, the indoor solution film, the liquid storage tank, the outdoor solution film and the liquid pump form a closed-loop solution circulating system, and the self-cleaning control method comprises the following steps: under the refrigeration working condition, the compressor is subjected to frequency reduction, the four-way valve is reversed, the rotating speed of an outdoor fan of the air conditioner is reduced, and the voltage of an indoor solution film and the voltage of an outdoor solution film are increased, so that the outdoor heat exchanger is frosted; after the outdoor heat exchanger frosts, the electronic expansion valve is closed firstly, and the electromagnetic valve at the low-pressure side of the compressor is closed after the preset time; and heating the outdoor heat exchanger, so that the outdoor heat exchanger is defrosted and cleaned.

In a preferred embodiment of the above self-cleaning control method, the step of "increasing the voltage of the indoor solution film and the voltage of the outdoor solution film" includes: the voltage of the indoor solution membrane and the voltage of the outdoor solution membrane were gradually increased to the highest voltage.

In a preferred embodiment of the above self-cleaning control method, the step of "reducing the rotation speed of the outdoor fan of the air conditioner" and the step of "increasing the voltage of the indoor solution film and the voltage of the outdoor solution film" are performed simultaneously.

In a preferred embodiment of the above self-cleaning control method, the self-cleaning control method further includes, at the same time as or after the step of "heating the outdoor heat exchanger": the outdoor fan of the air conditioner is operated at high speed.

In the preferred technical scheme of the self-cleaning control method, the outdoor heat exchanger is provided with an electric heating pipe, and the step of heating the outdoor heat exchanger specifically comprises the following steps: the outdoor heat exchanger is heated by connecting high voltage to the electric heating pipe.

In the preferred technical scheme of the self-cleaning control method, the liquid pump is a water pump, and the liquid storage tank is a water storage tank.

In a preferred embodiment of the self-cleaning control method, the self-cleaning control method further includes, while the step of "reducing the rotation speed of the outdoor fan of the air conditioner": the compressor is upscaled.

In the preferred technical solution of the above self-cleaning control method, the step of "raising the frequency of the compressor" specifically includes: the frequency of the compressor is gradually increased to the highest frequency.

In a preferred embodiment of the self-cleaning control method, the self-cleaning control method further includes, while the step of "reducing the rotation speed of the outdoor fan of the air conditioner": the opening of the electronic expansion valve is reduced.

In a preferred embodiment of the above self-cleaning control method, the self-cleaning control method further includes, at the same time as the step of "increasing the voltage of the indoor solution film and the voltage of the outdoor solution film": the rotational speed of the liquid pump is increased.

It can be understood by those skilled in the art that in the preferred technical solution of the present invention, under the normal refrigeration condition, the compressor is controlled to reduce the frequency below the frequency allowing the four-way valve to reverse, then the four-way valve reverses to make the air conditioner enter the normal heating condition, then the rotation speed of the outdoor fan of the air conditioner is reduced to make the air conditioner depart from the normal heating condition to start frosting the outdoor heat exchanger, and by increasing the voltage of the indoor solution film and the voltage of the outdoor solution film, the outdoor solution film can absorb more water vapor outdoors, the indoor solution film can absorb more water vapor indoors, and can be rapidly conveyed to the outdoor solution film under the action of the liquid pump (taking the water pump as an example below), the outdoor solution film can directly release the water vapor to the outdoor heat exchanger for frosting, that is, both the indoor water vapor absorbed by the indoor solution film and the outdoor water vapor absorbed by the outdoor solution film can be used to make the outdoor heat exchanger humidified, and then make the outdoor heat exchanger frost more fast, reduce the frosting time of outdoor heat exchanger, improve frosting efficiency, before defrosting the outdoor heat exchanger, through closing successively of the solenoid valve of electronic expansion valve and compressor low pressure side, make the refrigerant in the refrigerant circulation system all retrieve to indoor set one side of air conditioner, thereby avoid the refrigerant to produce the influence to subsequent defrosting, can make the outdoor heat exchanger concentrate, the defrosting fast, thereby take away bacterium and dust on the outdoor heat exchanger fully, when reaching the clean purpose of outdoor heat exchanger, improve the automatically cleaning efficiency to the outdoor heat exchanger, avoid extravagant too much time and produce too much energy consumption, and then promote user experience.

Furthermore, the voltage of the indoor solution film and the voltage of the outdoor solution film are raised to the highest voltage in a short time, namely, in the frosting process of the outdoor heat exchanger, the highest voltage of the indoor solution film and the highest voltage of the outdoor solution film operate, so that the steam absorption amount of the indoor solution film and the steam absorption amount of the outdoor solution film are both maximized, the outdoor solution film reduces the maximum amount of water vapor to the outdoor heat exchanger, the humidification amount of the outdoor heat exchanger is maximized, the outdoor heat exchanger is frosted quickly, the frosting time is further shortened, the self-cleaning time of the air conditioner of the outdoor heat exchanger is reduced integrally, and the self-cleaning efficiency is improved.

Furthermore, in or after the process of heating and defrosting the outdoor heat exchanger, the outdoor fan of the air conditioner runs at a high speed to improve the defrosting speed of the outdoor heat exchanger, namely, the defrosting is accelerated by blowing the frosted surface by strong wind, so that the self-cleaning time of the outdoor heat exchanger of the air conditioner is reduced on the whole, the self-cleaning efficiency is improved, and the user experience is further improved.

Furthermore, when the rotating speed of an outdoor fan of the air conditioner is reduced, the frosting speed of the outdoor heat exchanger can be further increased by increasing the frequency of the compressor, and the frosting time is reduced, so that the self-cleaning time of the outdoor heat exchanger of the air conditioner is reduced on the whole, and the self-cleaning efficiency is improved.

And furthermore, the frequency of the compressor is gradually increased to the highest frequency in a short time, namely, the compressor is in the highest-frequency operation in the frosting process of the outdoor heat exchanger, so that the frosting speed of the outdoor heat exchanger is further improved, the frosting time is reduced, the self-cleaning time of the outdoor heat exchanger of the air conditioner is integrally reduced, and the self-cleaning efficiency is improved.

Furthermore, when the rotating speed of an outdoor fan of the air conditioner is reduced, the frosting speed of the outdoor heat exchanger can be further increased by reducing the opening degree of the electronic expansion valve, and the frosting time is reduced, so that the self-cleaning time of the outdoor heat exchanger of the air conditioner is reduced on the whole, and the self-cleaning efficiency is improved.

And furthermore, the voltage of the indoor solution film and the voltage of the outdoor solution film are increased, the rotating speed of the water pump is increased, even if the solution circulating system is accelerated to circulate, so that the water vapor absorbed by the indoor solution film from the room can be quickly conveyed to the outdoor solution film, and the water vapor can be quickly released to the outdoor heat exchanger through the outdoor solution film, so that the outdoor heat exchanger is quickly humidified, the outdoor heat exchanger is quickly frosted, the frosting time of the outdoor heat exchanger is shortened, and the frosting efficiency is improved.

Drawings

FIG. 1 is a first schematic view (cooling mode) of the air conditioner of the present invention;

FIG. 2 is a schematic structural diagram of the air conditioner of the present invention, namely, a second heating mode;

fig. 3 is a flowchart of a self-cleaning control method of an air conditioner of the present invention;

fig. 4 is a logic control diagram of an embodiment of a self-cleaning control method of an air conditioner 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.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "middle", "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The invention provides a self-cleaning control method for an air conditioner, aiming at improving the self-cleaning efficiency of an outdoor heat exchanger, avoiding the waste of excessive time and the generation of excessive energy consumption and further improving the user experience.

Specifically, as shown in fig. 1 and 2, the air conditioner of the present invention includes an indoor heat exchanger 1, an outdoor heat exchanger 2, a compressor 3, an electronic expansion valve 4, and a four-way valve 5, where the indoor heat exchanger 1, the electronic expansion valve 4, the outdoor heat exchanger 2, the compressor 3, and the four-way valve 5 form a closed-loop refrigerant circulation system, and the four-way valve 5 is configured to change an operation condition of the air conditioner through reversing, that is, the air conditioner can be changed into a heating condition through reversing the four-way valve 5 under a cooling condition, and the air conditioner can be changed into a cooling condition through reversing the four-way. The air conditioner also comprises an indoor solution film 6, an outdoor solution film 7, a liquid pump 8 and a liquid storage tank 9, wherein the indoor solution film 6 is arranged on the indoor heat exchanger 1, the outdoor solution film 7 is arranged on the outdoor heat exchanger 2, the indoor solution film 6, the liquid storage tank 9, the outdoor solution film 7 and the liquid pump 8 form a closed-loop solution circulating system, it needs to be noted that under a normal refrigeration working condition or a dehumidification working condition, the indoor solution film 6 (also called as an indoor solution dehumidification film) has the function of pre-dehumidifying the inlet air of the indoor machine, namely absorbing indoor water vapor, and the moisture absorbed by the indoor solution film 6 can be circulated to the outdoor solution film 7 for reduction, and the reduced water vapor can cool and radiate the outdoor heat exchanger 2. In the heating condition, the outdoor solution membrane 7 (also referred to as an outdoor solution dehumidification membrane) pre-dehumidifies outdoor intake air, that is, absorbs outdoor water vapor, and water absorbed by the outdoor solution membrane 7 can be circulated to the indoor solution membrane 6 to be reduced, the reduced water vapor can humidify the outdoor heat exchanger 2, water can be reduced to water vapor by supplying electricity to the indoor solution membrane 6 to humidify the indoor heat exchanger 1, and water can be reduced to water vapor by supplying electricity to the outdoor solution membrane 7 to humidify the outdoor heat exchanger 2. The invention fully utilizes the water absorbability and the electrification reducibility of the indoor solution film 6 and the outdoor solution film 7, so that when the outdoor heat exchanger 2 is automatically cleaned, the outdoor solution film 7 is electrified to absorb a large amount of outdoor water vapor, meanwhile, the indoor solution film 6 absorbs a large amount of indoor water vapor, the indoor water vapor is conveyed to the outdoor solution film 7 under the action of the liquid pump 8, and the water vapor is released to the outdoor heat exchanger 2 through the electroreduction action, thereby realizing the frosting of the outdoor heat exchanger 2.

Specifically, as shown in fig. 1 to 3, the self-cleaning control method of the present invention includes: under the refrigeration working condition, firstly reducing the frequency of the compressor 3 below the frequency allowing the four-way valve 5 to reverse, then reversing the four-way valve 5 to enable the air conditioner to enter the normal heating working condition, then reducing the rotating speed of an outdoor fan of the air conditioner and increasing the voltage of an indoor solution film 6 and the voltage of an outdoor solution film 7, thereby enabling the outdoor heat exchanger 2 to frost; after the outdoor heat exchanger 2 frosts, the electronic expansion valve 4 is closed firstly, and the electromagnetic valve at the low-pressure side of the compressor 3 is closed after the preset time; the outdoor heat exchanger 2 is heated, so that the outdoor heat exchanger 2 is defrosted and cleaned. It should be noted that, as shown in fig. 1 and 2, under the cooling condition, the flow of the refrigerant is counterclockwise as shown in fig. 1, after the air conditioner is switched from the cooling condition to the heating condition, the flow of the refrigerant is clockwise as shown in fig. 2, at this time, the solenoid valve at the low pressure side of the compressor 3 is the second solenoid valve 11 in fig. 2, the solenoid valve at the high pressure side of the compressor 3 is the first solenoid valve 10 in fig. 2, that is, the second solenoid valve 11 is located at the low pressure side of the compressor 3, and the first solenoid valve 10 is located at the high pressure side of the compressor 3, in the present invention, after the electronic expansion valve 4 is closed, the refrigerant is gradually recovered to the indoor side of the air conditioner along the clockwise flow direction, after the recovery is completed, that is, after the preset time is reached, the second solenoid valve 11 is closed, so that the refrigerant is blocked at the indoor side of the air conditioner, thereby avoiding the influence of the subsequent defrosting process, the defrosting efficiency and the defrosting effect of the outdoor heat exchanger 2 are improved. The preset time can be 30 seconds, namely the second electromagnetic valve 11 is closed after 30 seconds, so that the refrigerant is guaranteed to be completely recovered to the indoor side of the air conditioner, and certainly, the preset time can also be other times. In addition, it should be noted that, in the present invention, the liquid pump 8 is preferably a water pump, and the liquid storage tank 9 is preferably a water storage tank, that is, the outdoor heat exchanger 2 is frosted by the action of water circulation, of course, other liquid pumps 8 may be selected as long as the solution in the solution circulation system can be circulated, in addition, the liquid storage tank 9 may store water, or a mixed solution of water and other solutions may be stored, that is, other solvents may be added into water, so that the frosting speed can be increased by the action of the solvent when the outdoor heat exchanger 2 is frosted, and those skilled in the art may flexibly set the type of the solution in the liquid storage tank 9 in practical application as long as the frosting of the outdoor heat exchanger 2 is facilitated.

In a preferred embodiment, the step of "increasing the voltage of the indoor solution membrane 6 and the voltage of the outdoor solution membrane 7" includes: the voltage of the indoor solution membrane 6 and the voltage of the outdoor solution membrane 7 were gradually raised to the highest voltage. After the air conditioner enters the outdoor self-cleaning mode, the air conditioner is switched from the refrigerating working condition to the heating working condition, under the normal heating working condition, the voltage of the indoor solution membrane 6 and the voltage of the outdoor solution membrane 7 are both the heating working condition voltage, the voltage of the indoor solution membrane 6 and the voltage of the outdoor solution membrane 7 are rapidly increased, namely the water vapor absorption of the indoor solution membrane 6 and the water vapor absorption of the outdoor solution membrane 7 are rapidly increased, and therefore the preparation stage before frosting is completed. The gradual increase of the voltage of the indoor solution film 6 and the voltage of the outdoor solution film 7 may be a linear increase or a nonlinear increase of the voltages of the indoor solution film 6 and the outdoor solution film 7, and those skilled in the art can flexibly set the voltage increase modes of the voltages of the indoor solution film 6 and the outdoor solution film 7 in practical applications, as long as the voltages of the indoor solution film 6 and the outdoor solution film 7 are increased to the maximum voltage, and further the outdoor heat exchanger 2 is rapidly frosted in the frosting process. Further preferably, the step of "reducing the rotation speed of the outdoor fan of the air conditioner" and the step of "increasing the voltage of the indoor solution film 6 and the voltage of the outdoor solution film 7" are performed simultaneously, that is, before entering the frosting mode, the preparation for frosting is completed as quickly as possible, and the time of the frosting preparation stage is shortened, so as to reduce the self-cleaning time of the outdoor heat exchanger 2 of the air conditioner as a whole and improve the self-cleaning efficiency.

Preferably, simultaneously with or after the step of "heating the outdoor heat exchanger 2", the self-cleaning control method of the present invention further comprises: the outdoor fan of the air conditioner is operated at high speed. The heating of the outdoor heat exchanger 2 is to make the outdoor heat exchanger 2 defrost quickly, and in the defrosting process, the air flow on the surface of the frost can be accelerated by making the outdoor fan run at a high speed, so that the defrosting is faster, and the defrosting effect and the defrosting efficiency are improved. It should be noted that the high-speed operation of the outdoor fan in the present invention means that the outdoor fan is operated at a higher rotation speed than a normal heating fan (preferably, the outdoor fan is operated at the highest heating rotation speed). Specifically, the step of providing an electric heating pipe on the outdoor heat exchanger 2 and "heating the outdoor heat exchanger 2" includes: the outdoor heat exchanger 2 is heated by connecting high voltage to the electric heating pipe. In practical application, high voltage is applied to an electric heating tube (preferably, the hairpin tube 12) to heat the electric heating tube, so that the outdoor heat exchanger 2 is heated in a short distance, and frost on the outdoor heat exchanger 2 is melted at the highest speed.

In a preferred embodiment, in parallel with the step of "reducing the rotation speed of the outdoor fan of the air conditioner", the self-cleaning control method of the present invention further includes: the frequency of the compressor 3 is increased, and the frosting of the outdoor heat exchanger 2 can be facilitated by increasing the frequency of the compressor 3. Further preferably, the step of "raising the frequency of the compressor 3" includes: the frequency of the compressor 3 is gradually increased to the highest frequency. After the outdoor self-cleaning mode is entered, the air conditioner is switched from the refrigeration working condition to the heating working condition, under the normal heating working condition, the compressor 3 operates at the heating frequency, and the compressor 3 is rapidly increased to the maximum frequency in a short time, so that the preparation stage before frosting is completed. The frequency of the compressor 3 can be gradually increased in a linear relationship or in a nonlinear relationship, and a person skilled in the art can flexibly set the frequency increasing mode of the compressor 3 in practical application, as long as the frequency of the compressor 3 is increased to the highest frequency, and further the outdoor heat exchanger 2 is rapidly frosted in the frosting process. In another preferred embodiment, the self-cleaning control method, while the step of "reducing the rotation speed of the outdoor fan of the air conditioner" is performed, further includes: the opening degree of the electronic expansion valve 4 is decreased. By reducing the opening degree of the electronic expansion valve 4, the surface of the outdoor heat exchanger 2 can be frosted more quickly, thereby improving the frosting efficiency.

Preferably, the self-cleaning control method of the present invention further includes, simultaneously with the above-mentioned step of "raising the voltage of the indoor solution membrane 6 and the voltage of the outdoor solution membrane 7": the rotating speed of the liquid pump 8 is increased, and the flowing of the solution in the solution circulating system can be accelerated by increasing the rotating speed of the liquid pump 8, so that the water vapor can be continuously reduced to the outdoor heat exchanger 2, namely, the outdoor heat exchanger 2 is fully humidified, the rapid frosting of the outdoor heat exchanger 2 is realized, and the frosting efficiency is improved. In a preferred embodiment, the step of "increasing the rotation speed of the liquid pump 8" includes: the speed of the liquid pump 8 is gradually increased to the maximum speed. After the outdoor self-cleaning mode is entered, the air conditioner is switched from the refrigeration working condition to the heating working condition, under the normal heating working condition, the liquid pump 8 operates at the heating rotating speed, and the liquid pump 8 is rapidly increased to the highest rotating speed in a short time, so that the preparation stage before frosting is completed. The gradual increase of the rotation speed of the liquid pump 8 may be a linear increase of the rotation speed of the liquid pump 8, or a non-linear increase of the rotation speed of the liquid pump 8, and a person skilled in the art can flexibly set the rotation speed increase mode of the liquid pump 8 in practical application, as long as the rotation speed of the liquid pump 8 is increased to the highest rotation speed, so that the outdoor heat exchanger 2 is rapidly frosted in the frosting process.

The solution according to the invention is further elucidated below in connection with a most preferred embodiment. As shown in fig. 1, 2 and 4, in particular, in the case where the air conditioner performs a cooling operation, after the air conditioner receives an outdoor self-cleaning command, the frequency of the compressor 3 is firstly reduced to be lower than the frequency allowing the four-way valve 5 to reverse, then the four-way valve 5 is reversed, the air conditioner is switched to the heating working condition, then the compressor 3 is lowered to Rao-min from Rao according to the rapid frequency raising rate V to the maximum frequency fmax allowed by refrigeration, the electronic expansion valve 4 is closed to a b2 state from a b1 state, the indoor fan of the air conditioner is stopped, the rotating speed of the liquid pump 8 is raised to Rs-max from Rs, the voltage of the indoor solution film 6 is regulated to Vn-max from Vn, the voltage of the outdoor solution film 7 is regulated to Vao-max from Vao, the hairpin pipe 12 of the outdoor unit is in an unpowered state, the time lasts for t, and the stage is a preparation stage before frosting; after the preparation stage is finished, the outdoor heat exchanger 2 starts to frost for t1, and the stage is a frosting stage; after the frost is finished, the main control board of the air conditioner sends a refrigerant recovery command, firstly, the throttling element (comprising the electronic expansion valve 4, the stop valve, the capillary tube, the throttling short tube and the like) is quickly closed, the second electromagnetic valve 11 is closed after the preset time, the refrigerant recovery is finished, the refrigerant recovery stage is a refrigerant recovery stage, the frequency of the compressor 3 in the stage is the highest frequency of refrigeration, the rotating speed of the outdoor fan is the lowest, the electronic expansion valve 4 is in a state from a b2 to a b3 (namely in a closed state), the liquid pump 8 is powered off, the indoor solution film 6 is powered off, and the outdoor solution film 7 is powered off; then defrosting is carried out, firstly, high voltage is switched on to heat the hairpin pipe 12 to complete defrosting, and a large amount of defrosting water carries the dust and bacteria mixture on the surface of the outdoor heat exchanger 2 for t 3; then the outdoor fan runs at a high speed for t4, thereby completing the washing process of the outdoor heat exchanger 2; and finally, resetting the compressor 3, the outdoor fan, the indoor fan, the electronic expansion valve 4 and the like to return to the indoor heating state of the air conditioner for continuous operation for t5, so that defrosting is finished.

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 (10)

1. A self-cleaning control method for an air conditioner comprises an indoor heat exchanger, an outdoor heat exchanger, a compressor, an electronic expansion valve and a four-way valve, wherein the indoor heat exchanger, the electronic expansion valve, the outdoor heat exchanger, the compressor and the four-way valve form a closed-loop refrigerant circulating system,
the air conditioner is characterized by further comprising an indoor solution film, an outdoor solution film, a liquid pump and a liquid storage tank, wherein the indoor solution film is arranged on the indoor heat exchanger, the outdoor solution film is arranged on the outdoor heat exchanger, the indoor solution film, the liquid storage tank, the outdoor solution film and the liquid pump form a closed-loop solution circulating system, and the self-cleaning control method comprises the following steps:
under the refrigeration working condition, the compressor is subjected to frequency reduction, and the four-way valve is reversed;
reducing the rotation speed of an outdoor fan of the air conditioner and increasing the voltage of the indoor solution film and the voltage of the outdoor solution film, thereby frosting the outdoor heat exchanger;
after the outdoor heat exchanger frosts, the electronic expansion valve is closed firstly, and the electromagnetic valve at the low-pressure side of the compressor is closed after a preset time;
heating the outdoor heat exchanger, so that the outdoor heat exchanger is defrosted and cleaned.
2. The self-cleaning control method according to claim 1, wherein the step of "raising the voltage of the indoor solution film and the voltage of the outdoor solution film" specifically comprises:
gradually increasing the voltage of the indoor solution membrane and the voltage of the outdoor solution membrane to a maximum voltage.
3. The self-cleaning control method of claim 1, wherein the step of "reducing the rotation speed of an outdoor fan of the air conditioner" and the step of "increasing the voltage of the indoor solution film and the voltage of the outdoor solution film" are performed simultaneously.
4. The self-cleaning control method of claim 1, simultaneously with or after the step of "heating the outdoor heat exchanger", further comprising:
and enabling an outdoor fan of the air conditioner to run at a high speed.
5. The self-cleaning control method according to claim 1, wherein the outdoor heat exchanger is provided with an electric heating pipe, and the step of "heating the outdoor heat exchanger" specifically comprises:
and the outdoor heat exchanger is heated by connecting high-voltage electricity to the electric heating pipe.
6. The self-cleaning control method of claim 1, wherein the liquid pump is a water pump and the reservoir is a water reservoir.
7. The self-cleaning control method of any one of claims 1 to 6, wherein, simultaneously with the step of "reducing the rotation speed of the outdoor fan of the air conditioner", the self-cleaning control method further comprises:
up-converting the compressor.
8. The self-cleaning control method of claim 7, wherein the step of "upshifting the compressor" specifically comprises:
gradually increasing the frequency of the compressor to a maximum frequency.
9. The self-cleaning control method of any one of claims 1 to 6, wherein, simultaneously with the step of "reducing the rotation speed of the outdoor fan of the air conditioner", the self-cleaning control method further comprises:
and reducing the opening degree of the electronic expansion valve.
10. The self-cleaning control method according to any one of claims 1 to 6, wherein, simultaneously with the step of "raising the voltage of the indoor solution film and the voltage of the outdoor solution film", the self-cleaning control method further comprises:
the rotational speed of the liquid pump is increased.
CN201810848785.6A 2018-07-28 2018-07-28 Self-cleaning control method for air conditioner CN110762709A (en)

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CN107504640A (en) * 2017-08-21 2017-12-22 广东美的制冷设备有限公司 Air-conditioning system, air conditioner and refrigerant recovering control method
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010089909A (en) * 1998-12-07 2001-10-17 구자홍 Device and method for defrosting of air conditioner
JP2012052679A (en) * 2010-08-31 2012-03-15 Panasonic Corp Outdoor unit of air conditioner
CN107152746A (en) * 2016-03-03 2017-09-12 武汉海尔电器股份有限公司 A kind of method and apparatus for controlling indoor humidity
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