Air conditioner cleaning control method and air conditioner

Abstract

The invention discloses an air conditioner cleaning control method and an air conditioner. In an indoor unit cleaning mode, an indoor unit micro-frost rinsing mode is executed for n times; in the micro-frost rinsing mode of the indoor unit, the following steps are executed: under the refrigeration working condition, a compressor is controlled to operate, an outer fan is controlled to rotate, an inner fan is controlled to stop rotating, and the opening degree of an electronic expansion valve is the set frosting opening degree of the indoor unit; the control valve is switched off; the coil pipe temperature / surface temperature of the indoor heat exchanger is detected, and when the coil pipe temperature / surface temperature of the indoor heat exchanger is within a first temperature range, the control valve is opened; the coil pipe temperature / surface temperature of the indoor heat exchanger is detected, and when the coil pipe temperature / surface temperature of the indoor heat exchanger is within a second temperature range, it is judged that defrosting of the indoor heat exchanger is completed; by means of the mode of n times of indoor unit micro-frost rinsing, n times of frosting and defrosting processes are achieved, namely n times of micro-frost stripping and defrosting rinsing are achieved, and the technical problems that an indoor heat exchanger is poor in cleaning effect and long in cleaning time are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning, and in particular relates to an air conditioner cleaning control method and an air conditioner. Background Art

[0002] At present, many air conditioner manufacturers have launched air conditioner self-cleaning mode. The principle is to control the system to make the evaporation temperature of the indoor heat exchanger or outdoor heat exchanger reach sub-zero temperature, so that the condensed water will frost and expand on the surface of the heat exchanger, and the dust will be peeled off from the fins. When the frost reaches a certain level, it will defrost quickly and the dust will be discharged with the condensed water.

[0003] However, it usually takes about 20 minutes to clean the heat exchanger in the normal self-cleaning mode, and the current self-cleaning modes are all controlled by the system to try to produce more frost on the heat exchanger fins, and to remove the dust on the fin surface through the cold expansion frosting process of the condensed water. However, the above control method will cause the condensed water to remove part of the dust and fluff when the first layer of frost forms on the surface of the heat exchanger fins, but when the frost continues to form, it will frost on the outside of the first layer of frost, which is actually unable to remove the dust and fluff on the fin surface. Therefore, even if the frost is thicker, it does not have the effect of removing the frost due to cold expansion. The cleaning effect of the condensed water flow after the frost melts is actually very poor, and it cannot wash away the dust and fluff adhering to the fin surface. It can only take away the dust and fluff that was removed by the cold expansion frosting when the first layer of frost formed on the fin.

[0004] The current deep self-cleaning technology is to perform three consecutive self-cleaning frosting and defrosting modes to achieve a better cleaning effect. However, this mode basically takes more than 30 minutes, and because the control method of frosting and defrosting is basically the same, it also has the above-mentioned problems of ordinary self-cleaning.

[0005] Therefore, the current self-cleaning technology has poor cold expansion frost stripping effect and too long self-cleaning time. Summary of the invention

[0006] The invention provides an air conditioner cleaning control method, which solves the technical problems of poor cleaning effect and long cleaning time of an indoor heat exchanger in the prior art.

[0007] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0008] An air conditioner cleaning control method, wherein a bypass pipeline is connected in parallel at both ends of an air conditioner electronic expansion valve, and a control valve is arranged on the bypass pipeline; the method comprises:

[0009] Control the air conditioner to enter the indoor unit cleaning mode. In the indoor unit cleaning mode, execute the indoor unit light frost rinsing mode n times; n≥1;

[0010] In the indoor light frost rinse mode, follow the steps below:

[0011] Under refrigeration conditions, the compressor is controlled to run, the outdoor fan rotates, the indoor fan stops rotating, and the opening of the electronic expansion valve is set to the frosting opening of the indoor unit; the control valve is closed;

[0012] Detecting the coil temperature / surface temperature of the indoor heat exchanger, and opening the control valve when the coil temperature / surface temperature of the indoor heat exchanger is within a first temperature range;

[0013] Detecting the coil temperature / surface temperature of the indoor heat exchanger, and determining that the indoor heat exchanger has completed defrosting when the coil temperature / surface temperature of the indoor heat exchanger is within a second temperature range;

[0014] Among them, any value in the first temperature range is less than 0; and any value in the second temperature range is greater than 0.

[0015] In some embodiments of the present application, in the internal machine cleaning mode, after executing the internal machine light frost rinsing mode n times, the internal machine deep cleaning mode is executed again; in the internal machine deep cleaning mode, the following steps are performed:

[0016] Under refrigeration conditions, the compressor is controlled to run, the outdoor fan rotates, and the indoor fan stops rotating; the opening of the electronic expansion valve is set to the frosting opening of the indoor unit; the control valve is closed;

[0017] After the first set time, the internal fan is controlled to rotate.

[0018] In some embodiments of the present application, in the internal machine cleaning mode, after executing the internal machine light frost rinsing mode n times, the internal fan defrosting mode is executed again; in the internal fan defrosting mode, the following steps are performed:

[0019] Under refrigeration conditions, the compressor is controlled to run, the outdoor fan rotates, and the indoor fan stops rotating; the opening of the electronic expansion valve is set to the frosting opening of the indoor unit; the control valve is closed;

[0020] Detecting the coil temperature / surface temperature of the indoor heat exchanger, and controlling the rotation of the indoor fan when the coil temperature / surface temperature of the indoor heat exchanger is within a first temperature range;

[0021] The coil temperature / surface temperature of the indoor heat exchanger is detected, and when the coil temperature / surface temperature of the indoor heat exchanger is within a second temperature range, it is determined that the indoor heat exchanger has completed defrosting.

[0022] In some embodiments of the present application, in the indoor unit cleaning mode, the air guide plate at the air outlet of the indoor unit of the air conditioner is opened.

[0023] In some embodiments of the present application, the first temperature range is -5°C to -20°C; the second temperature range is 5°C to 20°C.

[0024] In some embodiments of the present application, the method further includes:

[0025] Control the air conditioner to enter the outdoor unit cleaning mode. In the outdoor unit cleaning mode, execute the outdoor unit light frost rinsing mode m times; m ≥ 1;

[0026] In the outdoor unit light frost rinse mode, follow the steps below:

[0027] Under heating conditions, the compressor is controlled to run, the outdoor fan stops rotating, the indoor fan rotates, and the opening of the electronic expansion valve is set to the frosting opening of the outdoor unit; the control valve is closed;

[0028] detecting the coil temperature / surface temperature of the outdoor heat exchanger, and opening the control valve when the coil temperature / surface temperature of the outdoor heat exchanger is within a third temperature range;

[0029] Detecting the coil temperature / surface temperature of the outdoor heat exchanger, and determining that defrosting of the outdoor heat exchanger is completed when the coil temperature / surface temperature of the outdoor heat exchanger is within a fourth temperature range;

[0030] Among them, any value in the third temperature range is less than 0; and any value in the fourth temperature range is greater than 0.

[0031] In some embodiments of the present application, in the external machine cleaning mode, after executing the external machine light frost rinsing mode m times, the external machine deep cleaning mode is executed again; in the external machine deep cleaning mode, the following steps are performed:

[0032] Under heating conditions, the compressor is controlled to run, the outdoor fan stops rotating, and the indoor fan rotates; the opening of the electronic expansion valve is set to the frosting opening of the outdoor unit; the control valve is closed;

[0033] After the second set time, the external fan is controlled to rotate.

[0034] In some embodiments of the present application, in the external machine cleaning mode, after executing the external machine light frost rinsing mode m times, the external fan defrosting mode is executed again; in the external fan defrosting mode, the following steps are performed:

[0035] Under heating conditions, the compressor is controlled to run, the outdoor fan stops rotating, and the indoor fan rotates; the opening of the electronic expansion valve is set to the frosting opening of the outdoor unit; the control valve is closed;

[0036] Detecting the coil temperature / surface temperature of the outdoor heat exchanger, and controlling the outdoor fan to rotate when the coil temperature / surface temperature of the outdoor heat exchanger is within a third temperature range;

[0037] The coil temperature / surface temperature of the outdoor heat exchanger is detected, and when the coil temperature / surface temperature of the outdoor heat exchanger is within a fourth temperature range, it is determined that defrosting of the outdoor heat exchanger is completed.

[0038] In some embodiments of the present application, the third temperature range is -5°C to -20°C; the fourth temperature range is 5°C to 20°C.

[0039] Based on the design of the above-mentioned air conditioner cleaning control method, the present invention proposes an air conditioner, which adopts the above-mentioned air conditioner cleaning control method.

[0040] Compared with the prior art, the advantages and positive effects of the present invention are as follows: the air conditioner cleaning control method and the air conditioner of the present invention, in the indoor unit cleaning mode, execute n times of indoor unit micro-frost rinsing mode; in the indoor unit micro-frost rinsing mode, execute the following steps: under the refrigeration condition, control the compressor to run, the outdoor fan to rotate, the indoor fan to stop rotating, and the opening of the electronic expansion valve to set the indoor unit frosting opening; the control valve is closed; the coil temperature / surface temperature of the indoor heat exchanger is detected, and when the coil temperature / surface temperature of the indoor heat exchanger is within the first temperature range, it is determined that the indoor heat exchanger has reached a micro-frost state, and the control valve is opened; the coil temperature / surface temperature of the indoor heat exchanger is detected, and when the coil temperature / surface temperature of the indoor heat exchanger is within the second temperature range, it is determined that the indoor heat exchanger has completed defrosting; through n times of indoor unit micro-frost rinsing mode, n times of frosting and defrosting processes are realized, that is, n times of micro-frost stripping and defrosting rinsing are realized, the cleaning effect of the indoor heat exchanger is improved, and the cleaning time is shortened, solving the technical problems of poor cleaning effect and long cleaning time of the indoor heat exchanger.

[0041] Other features and advantages of the present invention will become more apparent after reading the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0043] Figure 1 is a left side schematic diagram of an embodiment of an indoor unit of an air conditioner;

[0044] Figure 2 is a right side schematic diagram of an indoor heat exchanger;

[0045] Figure 3 is a flow chart of an embodiment of the air conditioner cleaning control method proposed by the present invention;

[0046] Figure 4 is a flow chart of another embodiment of the air conditioner cleaning control method proposed by the present invention;

[0047] Figure 5 is a flow chart of another embodiment of the air conditioner cleaning control method proposed by the present invention;

[0048] Figure 6 is a flow chart of another embodiment of the air conditioner cleaning control method proposed by the present invention;

[0049] Figure 7 is a flow chart of another embodiment of the air conditioner cleaning control method proposed by the present invention;

[0050] Figure 8 It is a flow chart of another embodiment of the air conditioner cleaning control method proposed by the present invention.

[0051] Reference numerals:

[0052] 1. Indoor heat exchanger; 1-1. Coil; 2. Indoor fan; 3. Air guide plate; 4. Stepper motor;

[0053] 5. Electric auxiliary heating device. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0056] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0057] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] Aiming at the technical problems of poor cleaning effect and long cleaning time of indoor heat exchanger of current air conditioner, the present invention proposes a cleaning control method and air conditioner of air conditioner, which makes the indoor heat exchanger enter frosting or defrosting state by controlling the on-off of bypass pipeline, and judges the frosting or defrosting state by the coil temperature / surface temperature of indoor heat exchanger, shortens the cleaning time, improves the cleaning effect, and solves the technical problems of poor cleaning effect and long cleaning time of indoor heat exchanger. Below, the air conditioner and its cleaning control method of the present invention are described in detail with reference to the accompanying drawings.

[0059] The air conditioner includes a compressor, a four-way valve, an indoor heat exchanger, an electronic expansion valve, an outdoor heat exchanger, an indoor fan, an outdoor fan, etc. The compressor, the four-way valve, the indoor heat exchanger, the electronic expansion valve, and the outdoor heat exchanger form a circulation system of the refrigerant. The air conditioner performs a cooling and heating cycle by using a compressor, an outdoor heat exchanger, an electronic expansion valve, and an indoor heat exchanger.

[0060] The outdoor unit of the air conditioner includes a compressor, a four-way valve, an outdoor heat exchanger, and an outdoor fan. The indoor unit of the air conditioner includes an indoor heat exchanger 1, an indoor fan 2, etc. The electronic expansion valve can be set in the outdoor unit of the air conditioner or in the indoor unit of the air conditioner.

[0061] like Figure 1 As shown, the indoor unit of the air conditioner further includes an air guide plate 3 and a stepper motor 4. The air guide plate 3 is arranged at the air outlet of the indoor unit of the air conditioner, and the stepper motor 4 controls the rotation of the air guide plate 3 to cover or open the air outlet. An electric auxiliary heating device 5 is also arranged in the air duct of the indoor unit of the air conditioner to increase the outlet air temperature.

[0062] like Figure 2 As shown, a temperature sensor is provided at the coil 1 - 1 of the indoor heat exchanger 1 for detecting the coil temperature.

[0063] A bypass pipeline is connected in parallel at both ends of the electronic expansion valve, and a control valve is arranged on the bypass pipeline to control the on-off of the bypass pipeline.

[0064] When the control valve is closed, the bypass line is closed. When the control valve is opened, the bypass line is opened.

[0065] Since the bypass line is connected in parallel with the electronic expansion valve, when the opening of the electronic expansion valve remains unchanged and the bypass line changes from being closed to being open, the refrigerant flow in the air conditioner increases.

[0066] The control valve is generally a solenoid valve, and the on and off of the control valve is controlled by the air conditioner controller.

[0067] The air conditioner adopts the air conditioner cleaning control method of embodiment 1. Specifically, the air conditioner cleaning control method of embodiment 1 is executed by the controller of the air conditioner.

[0068] Embodiment 1

[0069] The air conditioner cleaning control method of this embodiment mainly includes the following steps: Figure 3 shown.

[0070] When the entry conditions of the indoor unit cleaning mode are met, the air conditioner is controlled to enter the indoor unit cleaning mode. In the indoor unit cleaning mode, the indoor unit light frost rinsing mode is executed n times; n≥1.

[0071] In the internal machine light frost rinse mode, perform the following steps, see Figure 3 shown.

[0072] Step S11: Under refrigeration conditions, control the compressor to run (run at the first set frequency), the outdoor fan to rotate (rotate at the set outdoor unit speed), the indoor fan to stop rotating, the opening of the electronic expansion valve to the set indoor unit frosting opening, and the control valve to close; the indoor heat exchanger enters the frosting stage.

[0073] During the frosting stage, frost forms on the surface of the indoor heat exchanger, and dust on the surface of the heat exchanger is peeled off to achieve micro-frost peeling.

[0074] Step S12: Detect the coil temperature / surface temperature of the indoor heat exchanger.

[0075] Detecting the coil temperature / surface temperature of the indoor heat exchanger refers to detecting the coil temperature or surface temperature of the indoor heat exchanger. The surface temperature of the indoor heat exchanger refers to the surface temperature of the fins of the indoor heat exchanger.

[0076] Step S13: Determine whether the coil temperature / surface temperature of the indoor heat exchanger is within a first temperature range.

[0077] If the coil temperature / surface temperature of the indoor heat exchanger is not within the first temperature range, the process returns to step S12.

[0078] If the coil temperature / surface temperature of the indoor heat exchanger is within the first temperature range, it is determined that the indoor heat exchanger has reached a slightly frosted state, the fin slightly frosted cold expansion and dust removal are completed, and step S14 is executed.

[0079] Step S14: Open the control valve to allow the indoor heat exchanger to enter the defrosting stage.

[0080] Open the control valve, the bypass line is connected, the refrigerant flow rate increases, and the evaporation temperature of the refrigerant in the indoor heat exchanger rises rapidly, causing the frost formed on the surface of the indoor heat exchanger to melt.

[0081] During the defrost stage, the surface of the indoor heat exchanger begins to defrost, washing away the dust and achieving defrost rinsing.

[0082] Step S15: Detect the coil temperature / surface temperature of the indoor heat exchanger.

[0083] Step S16: Determine whether the coil temperature / surface temperature of the indoor heat exchanger is within the second temperature range.

[0084] If the coil temperature / surface temperature of the indoor heat exchanger is not within the second temperature range, the process returns to step S15.

[0085] If the coil temperature / surface temperature of the indoor heat exchanger is within the second temperature range, step S17 is executed: determining whether the indoor heat exchanger has completed defrosting.

[0086] After defrosting is completed, the control valve is closed and the indoor heat exchanger begins to frost again.

[0087] Among them, set the indoor unit frost opening degree < the maximum opening degree of the electronic expansion valve.

[0088] Any value in the first temperature range is <0, and any value in the second temperature range is >0.

[0089] In the internal machine cleaning mode, after executing the internal machine light frost rinsing mode n times (ie executing S11 to S17 n times), the internal machine cleaning mode is exited.

[0090] If the air conditioner enters the indoor unit cleaning mode from the cooling mode, it will enter the cooling mode again after exiting the indoor unit cleaning mode.

[0091] Under refrigeration conditions, the control valve is turned off, the indoor fan stops rotating, and the opening of the electronic expansion valve is adjusted to the set indoor unit frost opening, so that the surface of the indoor heat exchanger is quickly frosted; when the coil temperature / surface temperature of the indoor heat exchanger is within a first temperature range, it is determined that the indoor heat exchanger has reached a slightly frosted state, the control valve is opened, and the evaporation temperature of the refrigerant in the indoor heat exchanger rises rapidly, so that the surface of the indoor heat exchanger is quickly defrosted; when the coil temperature / surface temperature of the indoor heat exchanger is within a second temperature range, it is determined that the indoor heat exchanger has completed defrosting, and the control valve is turned off, and the frosting and defrosting process is repeated n times. Through high-frequency micro-frost stripping and defrosting rinsing, the indoor heat exchanger can achieve a better cleaning effect in a shorter time.

[0092] By controlling the closing and opening of the control valve, frosting and defrosting are controlled to achieve the switching between frosting and defrosting stages; the completion of micro-frost and defrosting is judged by the indoor heat exchanger coil temperature / surface temperature, and the switching speed between frosting and defrosting stages is fast, so the indoor heat exchanger can be cleaned in a shorter time.

[0093] The air conditioner cleaning control method of the present embodiment executes n times of the indoor unit light frost rinsing mode in the indoor unit cleaning mode; in the indoor unit light frost rinsing mode, executes the following steps: under the refrigeration condition, control the compressor to run, the outdoor fan to rotate, the indoor fan to stop rotating, and the opening of the electronic expansion valve to set the indoor unit frosting opening; the control valve is closed; the coil temperature / surface temperature of the indoor heat exchanger is detected, and when the coil temperature / surface temperature of the indoor heat exchanger is within the first temperature range, it is determined that the indoor heat exchanger has reached a light frost state, and the control valve is opened; the coil temperature / surface temperature of the indoor heat exchanger is detected, and when the coil temperature / surface temperature of the indoor heat exchanger is within the second temperature range, it is determined that the indoor heat exchanger has completed defrosting; through n times of the indoor unit light frost rinsing mode, n times of frosting and defrosting processes are realized, that is, n times of light frost stripping and defrosting rinsing are realized, the cleaning effect of the indoor heat exchanger is improved, and the cleaning time is shortened, thereby solving the technical problems of poor cleaning effect and long cleaning time of the indoor heat exchanger.

[0094] The air conditioner cleaning control method of this embodiment, in the indoor unit cleaning mode, controls the on-off of the control valve to make the indoor heat exchanger circulate n times of micro-frost and defrost, thereby achieving the effect of high-frequency micro-frost cold expansion to peel off the dust on the fin surface, and defrosting and rinsing to flush it away. The technical problem that the frost thickness in the traditional self-cleaning mode is very thick, but in fact only the first frost has the effect of cold expansion to peel off the dust, and the subsequent frost cannot play the role of cold expansion to peel off the dust.

[0095] In some embodiments of the present application, the first temperature range is -5°C to -20°C. That is, when the coil temperature / surface temperature of the indoor heat exchanger is between -5°C and -20°C, the indoor heat exchanger is judged to be in a slightly frosted state. Selecting the above temperature range can ensure that the surface of the indoor heat exchanger is frosted, while avoiding too thick frost and prolonging the cleaning time. As a preferred design scheme, the first temperature range is -5°C to -10°C.

[0096] In some embodiments of the present application, the second temperature range is 5°C to 20°C. That is, when the coil temperature / surface temperature of the indoor heat exchanger is between 5°C and 20°C, it is determined that the indoor heat exchanger has completed defrosting. Selecting the above temperature range can ensure that the indoor heat exchanger surface is defrosted and avoid prolonging the cleaning time. As a preferred design solution, the second temperature range is 5°C to 10°C.

[0097] In some other embodiments of the present application, after determining that the indoor heat exchanger has reached a slightly frosted state, the indoor heat exchanger can also enter the defrosting stage by controlling the electronic expansion valve opening to increase to the set indoor defrosting opening or the indoor fan to rotate or the outdoor fan to stop rotating. Therefore, after determining that the indoor heat exchanger has reached a slightly frosted state, the indoor heat exchanger can enter the defrosting stage by controlling the control valve to open or the electronic expansion valve opening to increase to the set indoor defrosting opening or the indoor fan to rotate or the outdoor fan to stop rotating. After determining that the indoor heat exchanger has completed defrosting, the control valve is controlled to close, the opening of the electronic expansion valve is reduced to the set indoor frosting opening, the indoor fan stops rotating, and the outdoor fan rotates, and the indoor heat exchanger begins to frost again. Among them, the set indoor frosting opening < the set indoor defrosting opening ≤ the maximum opening of the electronic expansion valve.

[0098] In some embodiments of the present application, in the internal machine cleaning mode, after executing the internal machine light frost rinsing mode n times, the internal machine deep cleaning mode is executed again; in the internal machine deep cleaning mode, the following steps are performed, see Figure 4 shown.

[0099] Step S21: Under refrigeration conditions, control the compressor to run (run at the first set frequency), the outdoor fan to rotate (rotate at the set outdoor unit speed), the indoor fan to stop rotating, the opening of the electronic expansion valve to the set indoor unit frosting opening; the control valve is closed; and the indoor heat exchanger enters the frosting stage.

[0100] Step S22: After a first set time (such as 5 to 10 minutes), the indoor fan is controlled to rotate (at a set indoor unit speed) so that the indoor heat exchanger enters the defrosting stage.

[0101] By designing steps S21 to S22, in the deep cleaning mode of the indoor unit, the indoor fan stops rotating, the refrigerant cannot exchange heat normally at the indoor heat exchanger, and the evaporation temperature drops rapidly (to below -20 degrees Celsius), and lasts for a first set time (such as 5 to 10 minutes), so that a large amount of frost is generated on the surface of the indoor heat exchanger; then the indoor fan is controlled to rotate, the indoor heat exchanger starts to defrost, and the dust is washed away by a large flow of condensed water. That is, the frost is formed by stopping the indoor fan and the defrost is performed by running the indoor fan.

[0102] After executing the indoor unit micro-frost rinsing mode n times, and after n cycles of micro-frost cold expansion and stripping, the dust has been stripped from the fins of the indoor heat exchanger, and then the indoor unit deep cleaning mode is performed again, with the frosting time being 5 to 10 minutes to make the frost thickness large enough; then the indoor fan is turned to defrost, so that the dust stripped by the previous micro-frost rinsing can be further washed away by a large flow of condensed water, thereby improving the cleaning effect.

[0103] In some other embodiments of the present application, in the internal machine cleaning mode, after executing the internal machine light frost rinsing mode n times, the internal fan defrosting mode is executed again; in the internal fan defrosting mode, the following steps are performed, see Figure 5 shown.

[0104] Step S31: Under refrigeration conditions, control the compressor to run (run at the first set frequency), the outdoor fan to rotate (rotate at the set outdoor unit speed), the indoor fan to stop rotating, the opening of the electronic expansion valve to the set indoor unit frosting opening, and the control valve to close; so that the indoor heat exchanger enters the frosting stage.

[0105] During the frosting stage, frost forms on the surface of the indoor heat exchanger, and dust on the surface of the heat exchanger is peeled off to achieve micro-frost peeling.

[0106] Step S32: Detect the coil temperature / surface temperature of the indoor heat exchanger.

[0107] Step S33: Determine whether the coil temperature / surface temperature of the indoor heat exchanger is within the first temperature range.

[0108] If the coil temperature / surface temperature of the indoor heat exchanger is not within the first temperature range, the process returns to step S32.

[0109] If the coil temperature / surface temperature of the indoor heat exchanger is within the first temperature range, it is determined that the indoor heat exchanger has reached a slightly frosted state, the fin slightly frosted cold expansion and dust removal are completed, and step S34 is executed.

[0110] Step S34: Control the indoor fan to rotate (rotate at the set indoor unit speed) so that the indoor heat exchanger enters the defrosting stage.

[0111] During the defrost stage, the surface of the indoor heat exchanger begins to defrost, washing away the dust and achieving defrost rinsing.

[0112] Step S35: Detect the coil temperature / surface temperature of the indoor heat exchanger.

[0113] Step S36: Determine whether the coil temperature / surface temperature of the indoor heat exchanger is within the second temperature range.

[0114] If the coil temperature / surface temperature of the indoor heat exchanger is not within the second temperature range, the process returns to step S35.

[0115] If the coil temperature / surface temperature of the indoor heat exchanger is within the second temperature range, step S37 is executed: determining whether the indoor heat exchanger has completed defrosting.

[0116] Under refrigeration conditions, the internal fan is controlled to stop rotating, so that the indoor heat exchanger enters the frosting stage and begins to frost; the internal fan is controlled to rotate, so that the indoor heat exchanger enters the defrosting stage; frosting and defrosting are controlled by starting and stopping the internal fan; whether micro-frost and defrosting are completed is judged by the coil temperature / surface temperature of the indoor heat exchanger, and the indoor heat exchanger can be cleaned in a shorter time.

[0117] After frosting, defrosting is performed by rotating the internal fan, which can make the air around the indoor heat exchanger flow, thereby replenishing humid air from the indoor environment, ensuring that the subsequent indoor heat exchanger can be frosted smoothly, and then ensuring the cleaning effect of the indoor unit's micro-frost rinse mode.

[0118] After n times of step S11 to step S17, that is, after n times of light frost and defrost, since the air around the indoor heat exchanger is almost still, the air humidity around the indoor heat exchanger is low, and frost may not form smoothly, affecting the rinsing effect; therefore, after n times of step S11 to step S17, step S31 to step S37 are executed again, and the internal fan is rotated to defrost, so that the air around the indoor heat exchanger flows, thereby increasing the air-conditioning humidity near the indoor heat exchanger.

[0119] In some embodiments of the present application, in the indoor unit cleaning mode, the air guide plate at the air outlet of the indoor unit of the air conditioner is opened to expose the air outlet, and the gas in the indoor unit air duct can flow out through the air outlet.

[0120] Conventional self-cleaning function Due to the large thickness of frost on the indoor unit heat exchanger, the frost has blocked the fins of the heat exchanger, and the air cannot circulate. Due to the particularity of the indoor unit's light frost rinsing mode, the air circulation capacity between the heat exchanger fins is still maintained during light frost and defrosting. Therefore, when the air guide plate is opened, the cold air of the indoor heat exchanger can naturally sink and come out from the air outlet, so that the indoor heat exchanger and the indoor fan are in a state of slight negative pressure. The slight negative pressure drives the high-humidity air at the air inlet of the indoor unit of the air conditioner to flow slowly to the surrounding of the indoor heat exchanger, thereby ensuring that the humidity around the indoor heat exchanger remains unchanged during the indoor unit's light frost rinsing mode, ensuring the effect of the indoor unit's light frost rinsing mode.

[0121] In some other embodiments of the present application, in the indoor cleaning mode, after executing the indoor light frost rinsing mode n times, the indoor deep cleaning mode and the indoor fan defrosting mode are executed once, and then the indoor cleaning mode is exited. The order of the indoor deep cleaning mode and the indoor fan defrosting mode is not limited.

[0122] The air conditioner cleaning control method of this embodiment also includes a step of cleaning the outdoor heat exchanger.

[0123] When the entry conditions of the outdoor unit cleaning mode are met, the air conditioner is controlled to enter the outdoor unit cleaning mode. In the outdoor unit cleaning mode, the outdoor unit light frost rinsing mode is executed m times; m≥1.

[0124] In the outdoor unit light frost rinse mode, perform the following steps, see Figure 6 shown.

[0125] Step S41: Under heating conditions, control the compressor to run (run at the second set frequency), stop the outdoor fan, rotate the indoor fan (rotate at the set indoor unit speed), adjust the opening of the electronic expansion valve to the set outdoor unit frost opening, and close the control valve; so that the outdoor heat exchanger enters the frosting stage.

[0126] During the frosting stage, frost forms on the surface of the outdoor heat exchanger, and dust on the surface of the heat exchanger is peeled off to achieve micro-frost peeling.

[0127] Step S42: Detect the coil temperature / surface temperature of the outdoor heat exchanger.

[0128] Detecting the coil temperature / surface temperature of the outdoor heat exchanger refers to detecting the coil temperature or surface temperature of the outdoor heat exchanger. The surface temperature of the outdoor heat exchanger refers to the surface temperature of the fins of the outdoor heat exchanger.

[0129] Step S43: Determine whether the coil temperature / surface temperature of the outdoor heat exchanger is within a third temperature range.

[0130] If the coil temperature / surface temperature of the outdoor heat exchanger is not within the third temperature range, the process returns to step S42.

[0131] If the coil temperature / surface temperature of the outdoor heat exchanger is within the third temperature range, it is determined that the outdoor heat exchanger has reached a slightly frosted state, the fin slightly frosted cold expansion and dust removal are completed, and step S44 is executed.

[0132] Step S44: Open the control valve to allow the outdoor heat exchanger to enter the defrosting stage.

[0133] Open the control valve, the bypass line is connected, the refrigerant flow rate increases, and the refrigerant temperature in the outdoor heat exchanger rises rapidly, causing the frost formed on the surface of the outdoor heat exchanger to melt.

[0134] During the defrost stage, the surface of the outdoor heat exchanger begins to defrost, washing away the dust and achieving defrost rinsing.

[0135] Step S45: Detect the coil temperature / surface temperature of the outdoor heat exchanger.

[0136] Step S46: Determine whether the coil temperature / surface temperature of the outdoor heat exchanger is within a fourth temperature range.

[0137] If the coil temperature / surface temperature of the outdoor heat exchanger is not within the fourth temperature range, the process returns to step S45.

[0138] If the coil temperature / surface temperature of the outdoor heat exchanger is within the fourth temperature range, step S47 is executed: determining whether the outdoor heat exchanger has completed defrosting.

[0139] After defrosting is completed, the control valve is closed and the outdoor heat exchanger begins to frost again.

[0140] Among them, set the outdoor unit frost opening degree < the maximum opening degree of the electronic expansion valve.

[0141] Any value in the third temperature range is <0; any value in the fourth temperature range is >0.

[0142] In the outdoor unit cleaning mode, after executing the outdoor unit light frost rinsing mode m times (ie executing S41 to S47 m times), the outdoor unit cleaning mode is exited.

[0143] If the air conditioner enters the outdoor unit cleaning mode from the heating mode, it will enter the heating mode after exiting the outdoor unit cleaning mode.

[0144] Under heating conditions, the control valve is turned off, the outdoor fan stops rotating, and the opening of the electronic expansion valve is adjusted to the set outdoor unit frost opening, so that the surface of the outdoor heat exchanger is quickly frosted; when the coil temperature / surface temperature of the outdoor heat exchanger is within the third temperature range, it is determined that the outdoor heat exchanger has reached a slightly frosted state, the control valve is opened, and the refrigerant temperature in the outdoor heat exchanger rises rapidly, so that the surface of the outdoor heat exchanger is quickly defrosted; when the coil temperature / surface temperature of the outdoor heat exchanger is within the fourth temperature range, it is determined that the outdoor heat exchanger has completed defrosting, and the control valve is turned off again, and the frosting and defrosting process is repeated m times. Through high-frequency micro-frost stripping and defrosting rinsing, the outdoor heat exchanger can achieve a better cleaning effect in a shorter time.

[0145] By controlling the closing and opening of the control valve, frosting and defrosting are controlled to achieve the switching between frosting and defrosting stages; the completion of micro-frost and defrosting is judged by the outdoor heat exchanger coil temperature / surface temperature, and the switching speed between frosting and defrosting stages is fast, so the outdoor heat exchanger can be cleaned in a shorter time.

[0146] The air conditioner cleaning control method of the present embodiment executes the outdoor unit light frost rinsing mode m times in the outdoor unit cleaning mode; in the outdoor unit light frost rinsing mode, executes the following steps: under the heating condition, control the compressor to run, the outdoor fan to stop rotating, the indoor fan to rotate, and the opening of the electronic expansion valve to set the outdoor unit frost opening; the control valve is closed; the coil temperature / surface temperature of the outdoor heat exchanger is detected, and when the coil temperature / surface temperature of the outdoor heat exchanger is within the third temperature range, it is determined that the outdoor heat exchanger has reached a light frost state, and the control valve is opened; the coil temperature / surface temperature of the outdoor heat exchanger is detected, and when the coil temperature / surface temperature of the outdoor heat exchanger is within the fourth temperature range, it is determined that the outdoor heat exchanger has completed defrosting; through the outdoor unit light frost rinsing mode m times, m frosting and defrosting processes are realized, that is, m times of light frost stripping and defrosting rinsing are realized, the cleaning effect of the outdoor heat exchanger is improved, and the cleaning time is shortened, solving the technical problems of poor cleaning effect and long cleaning time of the outdoor heat exchanger.

[0147] The air conditioner cleaning control method of this embodiment, in the outdoor unit cleaning mode, controls the on-off of the control valve to make the outdoor heat exchanger circulate m times of micro-frost and defrost, thereby achieving the effect of high-frequency micro-frost cold expansion to peel off the dust on the fin surface, and defrosting and rinsing to flush it away. The technical problem that the frost thickness in the traditional self-cleaning mode is very thick, but in fact only the first frost has the effect of cold expansion to peel off the dust, and the subsequent frost cannot play the role of cold expansion to peel off the dust.

[0148] In some embodiments of the present application, the third temperature range is -5°C to -20°C. That is, when the coil temperature / surface temperature of the outdoor heat exchanger is between -5°C and -20°C, it is determined that the outdoor heat exchanger has reached a slightly frosted state. Selecting the above temperature range can ensure that the surface of the outdoor heat exchanger is frosted, while avoiding too thick frost and prolonging the cleaning time. As a preferred design solution, the third temperature range is -5°C to -10°C.

[0149] In some embodiments of the present application, the fourth temperature range is 5°C to 20°C. That is, when the coil temperature / surface temperature of the outdoor heat exchanger is between 5°C and 20°C, it is determined that the outdoor heat exchanger has completed defrosting. Selecting the above temperature range can ensure that the surface of the outdoor heat exchanger has completed defrosting and avoid extending the cleaning time. As a preferred design solution, the fourth temperature range is 5°C to 10°C.

[0150] In some other embodiments of the present application, after determining that the outdoor heat exchanger has reached a slightly frosted state, the outdoor heat exchanger can also enter the defrosting stage by controlling the electronic expansion valve opening to increase to the set outdoor unit defrosting opening. Therefore, after determining that the outdoor heat exchanger has reached a slightly frosted state, the outdoor heat exchanger can enter the defrosting stage by controlling the control valve to open or the electronic expansion valve opening to increase to the set outdoor unit defrosting opening. Among them, the set outdoor unit frosting opening < the set outdoor unit defrosting opening ≤ the maximum opening of the electronic expansion valve.

[0151] In some embodiments of the present application, in the external machine cleaning mode, after executing the external machine light frost rinsing mode m times, the external machine deep cleaning mode is executed again; in the external machine deep cleaning mode, the following steps are performed, see Figure 7 shown.

[0152] Step S51: Under heating conditions, control the compressor to run (run at the second set frequency), stop the outdoor fan, rotate the indoor fan (rotate at the set indoor unit speed), and set the opening of the electronic expansion valve to the set outdoor unit frost opening; the control valve is closed; and the outdoor heat exchanger enters the frosting stage.

[0153] Step S52: After a second set time (such as 5 to 10 minutes), the outdoor fan is controlled to rotate (rotate at a set outdoor unit speed) so that the outdoor heat exchanger enters a defrosting stage.

[0154] By designing steps S51 to S52, in the outdoor unit deep cleaning mode, the outdoor fan stops rotating, the refrigerant cannot exchange heat normally at the outdoor heat exchanger, and the temperature drops rapidly (to below -20 degrees Celsius), and lasts for a second set time (such as 5 to 10 minutes), so that a large amount of frost is generated on the surface of the outdoor heat exchanger; then the outdoor fan is controlled to rotate, the outdoor heat exchanger starts to defrost, and the dust is washed away by a large flow of condensed water. That is, the outdoor fan stops rotating to form frost, and the outdoor fan runs to defrost.

[0155] After executing the outdoor unit micro-frost rinsing mode m times, and the micro-frost cold expansion and stripping effect m times, the dust has been stripped from the fins of the outdoor heat exchanger, and then the outdoor unit deep cleaning mode is performed again, with the frosting time being 5 to 10 minutes to make the frost thickness large enough; then the outdoor fan is turned to defrost, so as to further wash away the dust stripped by the previous micro-frost rinsing through a large flow of condensed water, thereby improving the cleaning effect.

[0156] In some other embodiments of the present application, in the external machine cleaning mode, after executing the external machine light frost rinsing mode m times, the external fan defrosting mode is executed again; in the external fan defrosting mode, the following steps are performed, see Figure 8 shown.

[0157] Step S61: Under heating conditions, control the compressor to run (run at the second set frequency), stop the outdoor fan, rotate the indoor fan (rotate at the set indoor unit speed), adjust the opening of the electronic expansion valve to set the outdoor unit frost opening; close the control valve; and allow the outdoor heat exchanger to enter the frosting stage.

[0158] During the frosting stage, frost forms on the surface of the outdoor heat exchanger, and dust on the surface of the heat exchanger is peeled off to achieve micro-frost peeling.

[0159] Step S62: Detect the coil temperature / surface temperature of the outdoor heat exchanger.

[0160] Step S63: Determine whether the coil temperature / surface temperature of the outdoor heat exchanger is within a third temperature range.

[0161] If the coil temperature / surface temperature of the outdoor heat exchanger is not within the third temperature range, the process returns to step S62.

[0162] If the coil temperature / surface temperature of the outdoor heat exchanger is within the third temperature range, it is determined that the outdoor heat exchanger has reached a slightly frosted state, the fin slightly frosted cold expansion and dust removal are completed, and step S64 is executed.

[0163] Step S64: Control the outdoor fan to rotate (rotate at the set outdoor unit speed) so that the outdoor heat exchanger enters the defrosting stage.

[0164] During the defrost stage, the surface of the outdoor heat exchanger begins to defrost, washing away the dust and achieving defrost rinsing.

[0165] Step S65: Detect the coil temperature / surface temperature of the outdoor heat exchanger.

[0166] Step S66: Determine whether the coil temperature / surface temperature of the outdoor heat exchanger is within a fourth temperature range.

[0167] If the coil temperature / surface temperature of the outdoor heat exchanger is not within the fourth temperature range, the process returns to step S65.

[0168] If the coil temperature / surface temperature of the outdoor heat exchanger is within the fourth temperature range, step S67 is executed: determining whether the outdoor heat exchanger has completed defrosting.

[0169] Under heating conditions, the outdoor fan is controlled to stop rotating, so that the outdoor heat exchanger enters the frosting stage and begins to frost; the outdoor fan is controlled to rotate, so that the outdoor heat exchanger enters the defrosting stage; frosting and defrosting are controlled by starting and stopping the outdoor fan; whether micro-frost and defrosting are completed is judged by the coil temperature / surface temperature of the outdoor heat exchanger, and the outdoor heat exchanger can be cleaned in a shorter time.

[0170] After frosting, defrosting is performed by rotating the outdoor fan, which can make the air around the outdoor heat exchanger flow, thereby replenishing humid air from the outdoor environment, ensuring that the subsequent outdoor heat exchanger can be frosted smoothly, and then ensuring the cleaning effect of the outdoor unit's micro-frost rinse mode.

[0171] After m times of steps S41 to S47, that is, after m times of light frost and defrosting, since the air around the outdoor heat exchanger is almost still, the air humidity around the outdoor heat exchanger is low and frost may not form smoothly, affecting the rinsing effect; therefore, after m times of steps S41 to S47, steps S61 to S67 are executed to defrost by rotating the outdoor fan, so that the air around the outdoor heat exchanger flows and the air-conditioning humidity near the outdoor heat exchanger is increased.

[0172] In some other embodiments of the present application, in the outdoor unit cleaning mode, after executing the outdoor unit light frost rinsing mode m times, the outdoor unit deep cleaning mode and the outdoor fan defrosting mode are executed once, and then the outdoor unit cleaning mode is exited. The order of the outdoor unit deep cleaning mode and the outdoor fan defrosting mode is not limited.

[0173] Embodiment 2

[0174] Based on the design of the air conditioner cleaning control method of the first embodiment, the second embodiment proposes an air conditioner that adopts the air conditioner cleaning control method of the first embodiment.

[0175] The air conditioner of the present embodiment executes n times of the indoor unit light frost rinsing mode in the indoor unit cleaning mode; in the indoor unit light frost rinsing mode, executes the following steps: under the refrigeration condition, controls the compressor to run, the outdoor fan to rotate, the indoor fan to stop rotating, and the opening of the electronic expansion valve to set the indoor unit frosting opening; the control valve is closed; the coil temperature / surface temperature of the indoor heat exchanger is detected, and when the coil temperature / surface temperature of the indoor heat exchanger is within the first temperature range, it is determined that the indoor heat exchanger has reached a light frost state, and the control valve is opened; the coil temperature / surface temperature of the indoor heat exchanger is detected, and when the coil temperature / surface temperature of the indoor heat exchanger is within the second temperature range, it is determined that the indoor heat exchanger has completed defrosting; through n times of the indoor unit light frost rinsing mode, n times of frosting and defrosting processes are realized, that is, n times of light frost stripping and defrosting rinsing are realized, the cleaning effect of the indoor heat exchanger is improved, and the cleaning time is shortened, thereby solving the technical problems of poor cleaning effect and long cleaning time of the indoor heat exchanger.

[0176] The air conditioner of this embodiment executes the outdoor unit light frost rinsing mode m times in the outdoor unit cleaning mode; in the outdoor unit light frost rinsing mode, the following steps are executed: under the heating condition, the compressor is controlled to run, the outdoor fan stops rotating, the indoor fan rotates, and the opening of the electronic expansion valve is the set outdoor unit frost opening; the control valve is closed; the coil temperature / surface temperature of the outdoor heat exchanger is detected, and when the coil temperature / surface temperature of the outdoor heat exchanger is within the third temperature range, it is determined that the outdoor heat exchanger has reached a light frost state, and the control valve is opened; the coil temperature / surface temperature of the outdoor heat exchanger is detected, and when the coil temperature / surface temperature of the outdoor heat exchanger is within the fourth temperature range, it is determined that the outdoor heat exchanger has completed defrosting; through the outdoor unit light frost rinsing mode m times, m frosting and defrosting processes are realized, that is, m times of light frost stripping and defrosting rinsing are realized, the cleaning effect of the outdoor heat exchanger is improved, and the cleaning time is shortened, thereby solving the technical problems of poor cleaning effect and long cleaning time of the outdoor heat exchanger.

[0177] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air conditioner cleaning control method, characterized in that: A bypass pipeline is connected in parallel at both ends of the air conditioner electronic expansion valve, and a control valve is arranged on the bypass pipeline; the method comprises: Control the air conditioner to enter the indoor unit cleaning mode. In the indoor unit cleaning mode, execute the indoor unit light frost rinsing mode n times; n≥1; In the indoor light frost rinse mode, follow the steps below: Under refrigeration conditions, the compressor is controlled to run, the outdoor fan rotates, the indoor fan stops rotating, and the opening of the electronic expansion valve is set to the frosting opening of the indoor unit; the control valve is closed; Detecting the coil temperature / surface temperature of the indoor heat exchanger, and opening the control valve when the coil temperature / surface temperature of the indoor heat exchanger is within a first temperature range; Detecting the coil temperature / surface temperature of the indoor heat exchanger, and determining that the indoor heat exchanger has completed defrosting when the coil temperature / surface temperature of the indoor heat exchanger is within a second temperature range; Among them, any value in the first temperature range is less than 0; and any value in the second temperature range is greater than 0.

2. The air conditioner cleaning control method according to claim 1, characterized in that: In the internal machine cleaning mode, after executing the internal machine light frost rinsing mode n times, execute the internal machine deep cleaning mode again; in the internal machine deep cleaning mode, perform the following steps: Under refrigeration conditions, the compressor is controlled to run, the outdoor fan rotates, and the indoor fan stops rotating; the opening of the electronic expansion valve is set to the frosting opening of the indoor unit; the control valve is closed; After the first set time, the internal fan is controlled to rotate.

3. The air conditioner cleaning control method according to claim 1, characterized in that: In the internal machine cleaning mode, after executing the internal machine light frost rinsing mode n times, execute the internal fan defrost mode again; in the internal fan defrost mode, perform the following steps: Under refrigeration conditions, the compressor is controlled to run, the outdoor fan rotates, and the indoor fan stops rotating; the opening of the electronic expansion valve is set to the frosting opening of the indoor unit; the control valve is closed; Detecting the coil temperature / surface temperature of the indoor heat exchanger, and controlling the rotation of the indoor fan when the coil temperature / surface temperature of the indoor heat exchanger is within a first temperature range; The coil temperature / surface temperature of the indoor heat exchanger is detected, and when the coil temperature / surface temperature of the indoor heat exchanger is within a second temperature range, it is determined that the indoor heat exchanger has completed defrosting.

4. The air conditioner cleaning control method according to claim 1, characterized in that: In the indoor unit cleaning mode, the air guide plate at the air outlet of the air conditioner indoor unit is opened.

5. The air conditioner cleaning control method according to claim 1, characterized in that: The first temperature range is -5°C to -20°C; the second temperature range is 5°C to 20°C.

6. The air conditioner cleaning control method according to any one of claims 1 to 5, characterized in that: The method further comprises: Control the air conditioner to enter the outdoor unit cleaning mode. In the outdoor unit cleaning mode, execute the outdoor unit light frost rinsing mode m times; m ≥ 1; In the outdoor unit light frost rinse mode, follow the steps below: Under heating conditions, the compressor is controlled to run, the outdoor fan stops rotating, the indoor fan rotates, and the opening of the electronic expansion valve is set to the frosting opening of the outdoor unit; the control valve is closed; detecting the coil temperature / surface temperature of the outdoor heat exchanger, and opening the control valve when the coil temperature / surface temperature of the outdoor heat exchanger is within a third temperature range; Detecting the coil temperature / surface temperature of the outdoor heat exchanger, and determining that defrosting of the outdoor heat exchanger is completed when the coil temperature / surface temperature of the outdoor heat exchanger is within a fourth temperature range; Among them, any value in the third temperature range is less than 0; and any value in the fourth temperature range is greater than 0.

7. The air conditioner cleaning control method according to claim 6, characterized in that: In the outdoor cleaning mode, after executing the outdoor light frost rinsing mode m times, execute the outdoor deep cleaning mode again; in the outdoor deep cleaning mode, perform the following steps: Under heating conditions, the compressor is controlled to run, the outdoor fan stops rotating, and the indoor fan rotates; the opening of the electronic expansion valve is set to the frosting opening of the outdoor unit; the control valve is closed; After the second set time, the external fan is controlled to rotate.

8. The air conditioner cleaning control method according to claim 6, characterized in that: In the outdoor unit cleaning mode, after executing the outdoor unit light frost rinsing mode m times, execute the outdoor fan defrosting mode again; in the outdoor fan defrosting mode, perform the following steps: Under heating conditions, the compressor is controlled to run, the outdoor fan stops rotating, and the indoor fan rotates; the opening of the electronic expansion valve is set to the frosting opening of the outdoor unit; The control valve is closed; Detecting the coil temperature / surface temperature of the outdoor heat exchanger, and controlling the outdoor fan to rotate when the coil temperature / surface temperature of the outdoor heat exchanger is within a third temperature range; The coil temperature / surface temperature of the outdoor heat exchanger is detected, and when the coil temperature / surface temperature of the outdoor heat exchanger is within a fourth temperature range, it is determined that defrosting of the outdoor heat exchanger is completed.

9. The air conditioner cleaning control method according to claim 6, characterized in that: The third temperature range is -5°C to -20°C; the fourth temperature range is 5°C to 20°C.

10. An air conditioner, characterized in that: An air conditioner cleaning control method as claimed in any one of claims 1 to 9 is adopted.

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