Air conditioner heat exchanger cleaning method and air conditioner

Abstract

The invention discloses an air conditioner heat exchanger cleaning 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 inner machine, the following steps are executed: under the refrigeration working condition, the compressor is controlled to operate, the outer fan is controlled to rotate, and the inner fan is controlled to stop rotating; the opening degree of the electronic expansion valve is the set frosting opening degree of the indoor unit; the current value between the first conductive terminal and the second conductive terminal is detected, when the current value belongs to the range of (0, a first current threshold value), it is judged that the indoor heat exchanger reaches a micro-frost state, and the inner fan is controlled to rotate or the outer fan is controlled to stop rotating; the current value between the first conductive terminal and the second conductive terminal is detected, and when the current value is larger than or equal to a second current threshold value, 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 a method for cleaning a heat exchanger of an air conditioner 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 a method for cleaning a heat exchanger of an air conditioner, which solves the technical problems of poor cleaning effect and long cleaning time of indoor heat exchangers in the prior art.

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

[0008] A method for cleaning an air conditioner heat exchanger, wherein a first conductive terminal and a second conductive terminal are arranged on the surface of an indoor heat exchanger at intervals; the cleaning 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, and the indoor fan stops rotating; the opening of the electronic expansion valve is set to the frosting opening of the indoor unit;

[0012] Detecting the current value between the first conductive terminal and the second conductive terminal, and when the detected current value ∈(0, first current threshold], controlling the inner fan to rotate or the outer fan to stop rotating;

[0013] Detecting a current value between the first conductive terminal and the second conductive terminal, and determining that the indoor heat exchanger has completed defrosting when the detected current value is greater than or equal to a second current threshold;

[0014] Wherein, the first current threshold is less than the second current threshold.

[0015] In some embodiments of the present application, when controlling the internal fan to stop rotating, the first braking device is used to control the internal fan to stop rotating;

[0016] When the external fan is controlled to stop rotating, the second braking device is used to control the external fan to stop rotating.

[0017] 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.

[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 machine deep cleaning mode is executed again; in the internal machine deep cleaning 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;

[0020] After the first set time, the internal fan is controlled to rotate.

[0021] 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 following steps are performed:

[0022] 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;

[0023] Detecting the current value between the first conductive terminal and the second conductive terminal, and when the detected current value ∈(0, first current threshold], increasing the opening of the electronic expansion valve to the set indoor defrosting opening;

[0024] Detecting a current value between the first conductive terminal and the second conductive terminal, and determining that the indoor heat exchanger has completed defrosting when the detected current value is greater than or equal to a second current threshold;

[0025] Among them, the set opening degree of the indoor unit for frosting is less than the set opening degree of the indoor unit for defrosting.

[0026] In some embodiments of the present application, a third conductive terminal and a fourth conductive terminal are disposed on the surface of the outdoor heat exchanger at intervals; the cleaning method further comprises:

[0027] 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;

[0028] In the outdoor unit light frost rinse mode, follow the steps below:

[0029] 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;

[0030] Detecting the current value between the third conductive terminal and the fourth conductive terminal, and when the detected current value ∈(0, third current threshold], controlling the external fan to rotate;

[0031] Detecting a current value between the third conductive terminal and the fourth conductive terminal, and determining that defrosting of the outdoor heat exchanger is completed when the detected current value is greater than or equal to a fourth current threshold;

[0032] The third current threshold is less than the fourth current threshold.

[0033] 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:

[0034] 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;

[0035] After the second set time, the external fan is controlled to rotate.

[0036] 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 following steps are performed:

[0037] 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;

[0038] Detecting the current value between the third conductive terminal and the fourth conductive terminal, and when the detected current value ∈(0, third current threshold], increasing the opening of the electronic expansion valve to the set external unit defrosting opening;

[0039] Detecting a current value between the third conductive terminal and the fourth conductive terminal, and determining that defrosting of the outdoor heat exchanger is completed when the detected current value is greater than or equal to a fourth current threshold;

[0040] Among them, the set outdoor unit frost opening is less than the set outdoor unit defrost opening.

[0041] In some embodiments of the present application, the first conductive terminal and the second conductive terminal are arranged at intervals on the same fin of the indoor heat exchanger; or, the first conductive terminal and the second conductive terminal are respectively arranged on two end covers of the indoor heat exchanger;

[0042] The third conductive terminal and the fourth conductive terminal are arranged at intervals on the same fin of the outdoor heat exchanger; or, the third conductive terminal and the fourth conductive terminal are respectively arranged on two end covers of the outdoor heat exchanger.

[0043] Based on the design of the air conditioner heat exchanger cleaning method, the present invention proposes an air conditioner, which adopts the air conditioner heat exchanger cleaning method.

[0044] Compared with the prior art, the advantages and positive effects of the present invention are as follows: the air conditioner heat exchanger cleaning method and the air conditioner of the present invention, in the indoor unit cleaning mode, execute n times the indoor unit light frost rinsing mode; in the indoor unit light frost rinsing mode, execute the following steps: in the refrigeration condition, control the compressor to run, the outdoor fan to rotate, and the indoor fan to stop rotating; the opening of the electronic expansion valve is set to the indoor unit frost opening; detect the current value between the first conductive terminal and the second conductive terminal, and when the current value between the first conductive terminal and the second conductive terminal∈(0, the first current threshold], judge When the indoor heat exchanger reaches a slightly frosted state, the indoor fan is controlled to rotate or the outdoor fan is stopped; the current value between the first conductive terminal and the second conductive terminal is detected, and when the current value between the first conductive terminal and the second conductive terminal is greater than or equal to the second current threshold, it is determined that the indoor heat exchanger has completed defrosting; through n times of indoor machine slightly frost rinsing mode, n times of frosting and defrosting processes are realized, that is, n times of slightly frost stripping and defrosting rinsing are realized, the cleaning effect of the indoor heat exchanger is improved, and the cleaning time is shortened, which solves the technical problems of poor cleaning effect and long cleaning time of the indoor heat exchanger.

[0045] 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

[0046] 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.

[0047] Figure 1 is a left side schematic diagram of an embodiment of an indoor unit of an air conditioner;

[0048] Figure 2 It is a schematic diagram of the circuit connection between the conductive terminal and the micro-current monitoring device;

[0049] Figure 3 is a flow chart of an embodiment of the air conditioner heat exchanger cleaning method proposed by the present invention;

[0050] Figure 4 is a flow chart of another embodiment of the air conditioner heat exchanger cleaning method proposed by the present invention;

[0051] Figure 5 is a flow chart of another embodiment of the air conditioner heat exchanger cleaning method proposed by the present invention;

[0052] Figure 6 is a flow chart of another embodiment of the air conditioner heat exchanger cleaning method proposed by the present invention;

[0053] Figure 7 is a flow chart of another embodiment of the air conditioner heat exchanger cleaning method proposed by the present invention;

[0054] Figure 8 It is a flow chart of another embodiment of the method for cleaning the air conditioner heat exchanger proposed by the present invention.

[0055] Reference numerals:

[0056] 1. Indoor heat exchanger; 2. Indoor fan; 3. Air guide plate; 4. Stepper motor; 5. Electric auxiliary heating device. DETAILED DESCRIPTION

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] In view of the current technical problems of poor cleaning effect and long cleaning time of indoor heat exchanger of air conditioner, the present invention proposes a method for cleaning heat exchanger of air conditioner and air conditioner, which controls the rotation and stop of external fan or internal fan to make the indoor heat exchanger enter frosting or defrosting state, and determines the frosting or defrosting state by the current value between two conductive terminals on the surface 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 the heat exchanger cleaning method of the present invention are described in detail in conjunction with the drawings.

[0062] 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.

[0063] 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.

[0064] Therefore, the air conditioner heat exchanger includes an indoor heat exchanger and an outdoor heat exchanger.

[0065] 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.

[0066] The air conditioner also includes a micro-current monitoring device and a DC power supply. The micro-current monitoring device is used to detect the current value and send the detected current value to the controller.

[0067] A first conductive terminal c1 and a second conductive terminal c2 are disposed on the surface of the indoor heat exchanger. A micro-current monitoring device is used to detect the current value between the first conductive terminal c1 and the second conductive terminal c2. Figure 2 shown.

[0068] The first conductive terminal c1 is connected to a DC power source, and the second conductive terminal c2 is connected to a micro-current monitoring device. When the first conductive terminal c1 is connected to the second conductive terminal c2, the micro-current monitoring device detects the current value.

[0069] When the surface of the indoor heat exchanger is dry, the first conductive terminal c1 is not connected to the second conductive terminal c2, and the current value between the two is zero.

[0070] When frost forms on the surface of the indoor heat exchanger, since frost has a conductive effect, the first conductive terminal c1 and the second conductive terminal c2 are connected through the frost, and the current value monitored by the micro-current monitoring device is I1.

[0071] When there is condensation water on the surface of the indoor heat exchanger, since water has a strong conductive effect, the first conductive terminal c1 and the second conductive terminal c2 are connected through the water, and the current value monitored by the micro-current monitoring device is I2.

[0072] A first current threshold and a second current threshold are preset, and the first current threshold is less than the second current threshold. Since the resistance of frost is large, I1≤the first current threshold. Since the resistance of condensed water is small, I2≥the second current threshold.

[0073] According to the magnitude relationship between the current value between the first conductive terminal c1 and the second conductive terminal c2 and the first current threshold and the second current threshold, it is possible to directly monitor whether the surface of the indoor heat exchanger is in a slightly frosted or defrosted state.

[0074] Similarly, a third conductive terminal c3 and a fourth conductive terminal c4 are disposed on the surface of the outdoor heat exchanger. The current value between the third conductive terminal c3 and the fourth conductive terminal c4 is detected by a micro-current monitoring device, such as Figure 2 shown.

[0075] The third conductive terminal c3 is connected to a DC power source, and the fourth conductive terminal c4 is connected to a micro-current monitoring device. When the third conductive terminal c3 is connected to the fourth conductive terminal c4, the micro-current monitoring device detects the current value.

[0076] When the surface of the outdoor heat exchanger is dry, the third conductive terminal c3 is not connected to the fourth conductive terminal c4, and the current value between the third conductive terminal c3 and the fourth conductive terminal c4 is zero.

[0077] When frost forms on the surface of the outdoor heat exchanger, since frost has a conductive effect, the third conductive terminal c3 and the fourth conductive terminal c4 are connected through the frost, and the current value monitored by the micro-current monitoring device is I3.

[0078] When there is condensation water on the surface of the outdoor heat exchanger, since water has a strong conductive effect, the third conductive terminal c3 and the fourth conductive terminal c4 are connected through water, and the current value monitored by the micro-current monitoring device is I4.

[0079] A third current threshold and a fourth current threshold are preset, and the third current threshold is less than the fourth current threshold. Since the resistance of frost is large, I3≤the third current threshold. Since the resistance of condensed water is small, I4≥the fourth current threshold.

[0080] According to the magnitude relationship between the current value between the third conductive terminal c3 and the fourth conductive terminal c4 and the third current threshold and the fourth current threshold, it is possible to directly monitor whether the surface of the outdoor heat exchanger is in a slightly frosted or defrosted state.

[0081] The air conditioner adopts the air conditioner heat exchanger cleaning method of embodiment 1. Specifically, the air conditioner controller executes the air conditioner heat exchanger cleaning method of embodiment 1.

[0082] Embodiment 1

[0083] The air conditioner heat exchanger cleaning method of this embodiment mainly includes the following steps: Figure 3 shown.

[0084] 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.

[0085] In the internal machine light frost rinse mode, perform the following steps, see Figure 3 shown.

[0086] 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, and the opening of the electronic expansion valve to adjust to the set indoor unit frosting opening, so that the indoor heat exchanger enters the frosting stage.

[0087] 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.

[0088] Step S12: Detecting the current value between the first conductive terminal and the second conductive terminal.

[0089] Step S13: Determine whether the current value between the first conductive terminal and the second conductive terminal is ∈(0, first current threshold].

[0090] If the current value between the first conductive terminal and the second conductive terminal is not within the range of (0, first current threshold], the process returns to step S12.

[0091] If the current value between the first conductive terminal and the second conductive terminal is within the range of (0, first current threshold], 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.

[0092] Step S14: Control the indoor fan to rotate (rotate at the set indoor unit speed) or stop the outdoor fan to make the indoor heat exchanger enter the defrosting stage.

[0093] The indoor heat exchanger can start to defrost when the indoor fan rotates or the outdoor fan stops rotating.

[0094] During the defrost stage, the surface of the indoor heat exchanger begins to defrost, washing away the dust and achieving defrost rinsing.

[0095] Step S15: Detecting the current value between the first conductive terminal and the second conductive terminal.

[0096] Step S16: determining whether the current value between the first conductive terminal and the second conductive terminal is greater than or equal to a second current threshold.

[0097] If the current value between the first conductive terminal and the second conductive terminal is less than the second current threshold, the process returns to step S15.

[0098] If the current value between the first conductive terminal and the second conductive terminal is greater than or equal to the second current threshold, step S17 is executed: determining that the indoor heat exchanger has completed defrosting.

[0099] After defrosting is completed, the indoor fan stops rotating, the outdoor fan rotates, and the indoor heat exchanger starts defrosting again.

[0100] Wherein, the first current threshold is less than the second current threshold.

[0101] 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.

[0102] 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.

[0103] Under the refrigeration condition, the outer fan is controlled to rotate and the inner fan is stopped, and the opening of the electronic expansion valve is adjusted to the set frosting opening of the inner unit, so that the surface of the indoor heat exchanger is quickly frosted and enters the frosting stage; when the current value between the first conductive terminal and the second conductive terminal is within the range of (0, the first current threshold], it is determined that the indoor heat exchanger reaches a slightly frosted state, and the inner fan is controlled to rotate or the outer fan is stopped, so that the surface of the indoor heat exchanger is quickly defrosted, and the indoor heat exchanger enters the defrosting stage; when the current value between the first conductive terminal and the second conductive terminal is greater than or equal to the second current threshold, it is determined that the indoor heat exchanger has completed defrosting. Repeat the frosting and defrosting process n times, and through high-frequency micro-frost stripping and defrosting rinsing, the indoor heat exchanger can achieve a better cleaning effect in a shorter time.

[0104] By controlling the start and stop of the indoor and outdoor fans, the refrigerant circulation temperature in the air conditioner is adjusted, and frosting and defrosting are controlled to achieve switching between the frosting and defrosting stages. The current value between the first conductive terminal and the second conductive terminal is used to determine whether micro-frost and defrosting are completed. The switching speed between the frosting and defrosting stages is fast, and the indoor heat exchanger can be cleaned in a shorter time.

[0105] 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, increasing the air-conditioning humidity near the indoor heat exchanger, and ensuring that the subsequent indoor heat exchanger can be frosted smoothly, thereby ensuring the cleaning effect of the indoor unit's light frost rinse mode.

[0106] After frost forms, the temperature of the refrigerant in the indoor heat exchanger can be increased by stopping the rotation of the outdoor fan, and the surface begins to defrost.

[0107] The air conditioner heat exchanger cleaning method of the present embodiment performs n times of the indoor unit light frost rinsing mode in the indoor unit cleaning mode; performs the following steps in the indoor unit light frost rinsing mode: in the refrigeration condition, controls the compressor to run, the outdoor fan to rotate, and the indoor fan to stop rotating; the opening of the electronic expansion valve is the set indoor unit frosting opening; detects the current value between the first conductive terminal and the second conductive terminal, and when the current value between the first conductive terminal and the second conductive terminal is ∈(0, the first current threshold], determines that the indoor heat exchanger reaches a light frost state, controls the indoor fan to rotate or the outdoor fan to stop rotating; detects the current value between the first conductive terminal and the second conductive terminal, and when the current value between the first conductive terminal and the second conductive terminal is greater than or equal to the second current threshold, determines 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.

[0108] The air conditioner heat exchanger cleaning method of this embodiment, in the indoor unit cleaning mode, controls the start and stop of the indoor fan and the outdoor fan 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.

[0109] 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 opening of the electronic expansion valve to increase to the set indoor defrosting opening. 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 opening of the electronic expansion valve to increase to the set indoor defrosting opening or the indoor fan rotates or the outdoor fan stops rotating. After determining that the indoor heat exchanger has completed defrosting, the opening of the electronic expansion valve is controlled to decrease 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.

[0110] In some embodiments of the present application, the first conductive terminal and the second conductive terminal are spaced apart and arranged on the same fin of the indoor heat exchanger to improve the accuracy of the detected current value, thereby accurately judging the slight frost or defrost state of the surface of the indoor heat exchanger.

[0111] In some other embodiments of the present application, the first conductive terminal and the second conductive terminal are respectively arranged on two end covers of the indoor heat exchanger. That is, the first conductive terminal is arranged on one end cover of the indoor heat exchanger, and the second conductive terminal is arranged on the other end cover of the indoor heat exchanger. The first conductive terminal and the second conductive terminal can be more conveniently installed on the end cover, and since the end cover is directly installed next to the fin, the end cover can also enter the micro-frost and defrost modes. Therefore, for the convenience of installation, the first conductive terminal and the second conductive terminal are respectively installed on the end covers at both ends of the fin of the indoor heat exchanger.

[0112] 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.

[0113] 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, and the opening of the electronic expansion valve to the set indoor unit frosting opening; so that the indoor heat exchanger enters the frosting stage.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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 valve opening defrosting mode is executed again; in the indoor valve opening defrosting mode, the following steps are performed, see Figure 5 shown.

[0118] 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, and the opening of the electronic expansion valve to adjust to the set indoor unit frosting opening, so that the indoor heat exchanger enters the frosting stage.

[0119] 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.

[0120] Step S32: Detecting the current value between the first conductive terminal and the second conductive terminal.

[0121] Step S33: Determine whether the current value between the first conductive terminal and the second conductive terminal is ∈(0, first current threshold].

[0122] If the current value between the first conductive terminal and the second conductive terminal is not within the range of (0, first current threshold], the process returns to step S32.

[0123] If the current value between the first conductive terminal and the second conductive terminal is within the range of (0, first current threshold], 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.

[0124] Step S34: increasing the opening of the electronic expansion valve to the set indoor unit defrosting opening, so that the indoor heat exchanger enters the defrosting stage.

[0125] When the opening of the electronic expansion valve increases to the set indoor unit defrosting opening, the refrigerant flow 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.

[0126] During the defrost stage, the surface of the indoor heat exchanger begins to defrost, washing away the dust and achieving defrost rinsing.

[0127] Step S35: Detecting the current value between the first conductive terminal and the second conductive terminal.

[0128] Step S36: determining whether the current value between the first conductive terminal and the second conductive terminal is greater than or equal to a second current threshold.

[0129] If the current value between the first conductive terminal and the second conductive terminal is less than the second current threshold, the process returns to step S35.

[0130] If the current value between the first conductive terminal and the second conductive terminal is greater than or equal to the second current threshold, step S37 is executed: determining that the indoor heat exchanger has completed defrosting.

[0131] After defrosting is completed, the opening of the electronic expansion valve is reduced to the set indoor unit frost opening, and the indoor heat exchanger can start frosting again.

[0132] Among them, the set indoor unit frost opening < set indoor unit defrost opening ≤ maximum opening of the electronic expansion valve.

[0133] Under the refrigeration condition, the indoor fan is controlled to stop rotating and the outdoor fan is controlled to rotate, 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 current value between the first conductive terminal and the second conductive terminal is within the range of (0, the first current threshold], it is determined that the indoor heat exchanger has reached a slightly frosted state, and the opening of the electronic expansion valve is increased to the set indoor unit defrosting opening, 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 current value between the first conductive terminal and the second conductive terminal is greater than or equal to the second current threshold, it is determined that the indoor heat exchanger has completed defrosting; through slightly frost stripping and defrosting rinsing, the indoor heat exchanger can achieve a better cleaning effect in a shorter time.

[0134] By adjusting the opening of the electronic expansion valve (switching between setting the opening of the indoor unit for frosting and setting the opening of the indoor unit for defrosting), frosting and defrosting are controlled to achieve switching between the frosting and defrosting stages; whether micro-frost and defrosting are completed is judged by the current value between the first conductive terminal and the second conductive terminal, and the switching speed between the frosting and defrosting stages is fast, so that the indoor heat exchanger can be cleaned in a shorter time.

[0135] The air conditioner heat exchanger cleaning method of the present embodiment, in the indoor unit cleaning mode, after executing the indoor unit light frost rinsing mode n times, then 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; detect the current value between the first conductive terminal and the second conductive terminal, when the current value between the first conductive terminal and the second conductive terminal is ∈(0, the first current threshold], it is determined that the indoor heat exchanger has reached a light frost state, and the opening of the electronic expansion valve is increased to the set indoor unit defrosting opening; detect the current value between the first conductive terminal and the second conductive terminal, when the current value between the first conductive terminal and the second conductive terminal is greater than or equal to the second current threshold, it is determined that the indoor heat exchanger has completed defrosting; through n times of indoor unit light frost rinsing mode and one time of indoor unit valve opening defrosting mode, n+1 times of frosting and defrosting process are realized, that is, n+1 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, solving the technical problems of poor cleaning effect and long cleaning time of the indoor heat exchanger.

[0136] 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.

[0137] 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.

[0138] In some embodiments of the present application, when controlling the internal fan to stop rotating, the first braking device is used to control the internal fan to stop rotating, so that the internal fan can stop rotating quickly to avoid affecting normal frosting and defrosting.

[0139] In some embodiments of the present application, when controlling the external fan to stop rotating, the second braking device is used to control the external fan to stop rotating, so that the external fan can stop rotating quickly to avoid affecting normal frosting and defrosting.

[0140] The controller sends a braking signal to the first braking device or the second braking device, and controls the inner fan or the outer fan to stop rotating through the first braking device or the second braking device.

[0141] 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 valve opening defrosting mode are executed once, and then the indoor cleaning mode is exited. The order of the indoor deep cleaning mode and the indoor valve opening defrosting mode is not limited.

[0142] The air conditioner heat exchanger cleaning method of this embodiment also includes a step of cleaning the outdoor heat exchanger.

[0143] 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.

[0144] In the outdoor unit light frost rinse mode, perform the following steps, see Figure 6 shown.

[0145] 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 fan speed), and adjust the opening of the electronic expansion valve to set the outdoor unit frost opening; so that the outdoor heat exchanger enters the frosting stage.

[0146] 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.

[0147] Step S42: Detecting the current value between the third conductive terminal and the fourth conductive terminal.

[0148] Step S43: Determine whether the current value between the third conductive terminal and the fourth conductive terminal is ∈(0, third current threshold].

[0149] If the current value between the third conductive terminal and the fourth conductive terminal is not within the range of (0, third current threshold], the process returns to step S42.

[0150] If the current value between the third conductive terminal and the fourth conductive terminal is within the range of (0, third current threshold], 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.

[0151] Step S44: Control the outdoor fan to rotate (rotate at the set outdoor unit speed) so that the outdoor heat exchanger enters the defrosting stage.

[0152] The rotation of the outdoor fan can cause the outdoor heat exchanger to begin defrosting.

[0153] During the defrost stage, the surface of the outdoor heat exchanger begins to defrost, washing away the dust and achieving defrost rinsing.

[0154] Step S45: Detecting the current value between the third conductive terminal and the fourth conductive terminal.

[0155] Step S46: determining whether the current value between the third conductive terminal and the fourth conductive terminal is greater than or equal to a fourth current threshold.

[0156] If the current value between the third conductive terminal and the fourth conductive terminal is less than the fourth current threshold, the process returns to step S45.

[0157] If the current value between the third conductive terminal and the fourth conductive terminal is greater than or equal to the fourth current threshold, step S47 is executed: determining that the outdoor heat exchanger has completed defrosting.

[0158] After defrosting is completed, the inner fan starts to rotate, the outer fan stops rotating, and the outdoor heat exchanger starts to frost again.

[0159] The third current threshold is less than the fourth current threshold.

[0160] 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.

[0161] 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.

[0162] Under the heating condition, the inner fan is controlled to rotate, the outer fan is stopped, and the opening of the electronic expansion valve is adjusted to the set frosting opening of the outer unit, so that the surface of the outdoor heat exchanger is quickly frosted and enters the frosting stage; when the current value between the third conductive terminal and the fourth conductive terminal is within the range of (0, the third current threshold], it is determined that the outdoor heat exchanger reaches a slightly frosted state, and the outer fan is controlled to rotate, so that the surface of the outdoor heat exchanger is quickly defrosted, and the outdoor heat exchanger enters the defrosting stage; when the current value between the third conductive terminal and the fourth conductive terminal is greater than or equal to the fourth current threshold, it is determined that the outdoor heat exchanger has completed defrosting. Repeat the frosting and defrosting process m times, and through high-frequency slight frost stripping and defrosting rinsing, the outdoor heat exchanger can achieve a better cleaning effect in a shorter time.

[0163] By controlling the start and stop of the outdoor fan, the refrigerant circulation temperature in the air conditioner is adjusted to control frosting and defrosting, thereby realizing the switching between the frosting and defrosting stages. By judging whether micro-frost and defrosting are completed through the current value between the third conductive terminal and the fourth conductive terminal, the switching speed between the frosting and defrosting stages is fast, and the outdoor heat exchanger can be cleaned in a shorter time.

[0164] 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, increasing the air-conditioning humidity near the outdoor heat exchanger, and ensuring that the subsequent outdoor heat exchanger can be frosted smoothly, thereby ensuring the cleaning effect of the outdoor unit's micro-frost rinse mode.

[0165] The air conditioner heat exchanger cleaning method of the present embodiment performs m times of outdoor unit light frost rinsing mode in outdoor unit cleaning mode; performs the following steps in outdoor unit light frost rinsing mode: in heating condition, controls the compressor to run, outdoor fan to stop rotating, and indoor fan to rotate; the opening of the electronic expansion valve is the set outdoor unit frosting opening; detects the current value between the third conductive terminal and the fourth conductive terminal, and when the current value between the third conductive terminal and the fourth conductive terminal is ∈(0, third current threshold], determines that the outdoor heat exchanger reaches a light frost state, and controls the outdoor fan to rotate; detects the current value between the third conductive terminal and the fourth conductive terminal, and when the current value between the third conductive terminal and the fourth conductive terminal is greater than or equal to the fourth current threshold, determines that the outdoor heat exchanger completes defrosting; through m times of outdoor unit light frost rinsing mode, m times of frosting and defrosting process 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.

[0166] The air conditioner heat exchanger cleaning method of this embodiment, in the outdoor unit cleaning mode, controls the start and stop of the external fan 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.

[0167] In some embodiments of the present application, the third conductive terminal and the fourth conductive terminal are spaced apart and arranged on the same fin of the outdoor heat exchanger to improve the accuracy of the detected current value, thereby accurately judging the slight frost or defrost state of the surface of the outdoor heat exchanger.

[0168] In some other embodiments of the present application, the third conductive terminal and the fourth conductive terminal are respectively arranged on two end covers of the outdoor heat exchanger. That is, the third conductive terminal is arranged on one end cover of the outdoor heat exchanger, and the fourth conductive terminal is arranged on the other end cover of the outdoor heat exchanger. The third conductive terminal and the fourth conductive terminal can be more conveniently installed on the end cover, and since the end cover is directly installed next to the fin, the end cover can also enter the micro-frost and defrost modes. Therefore, for the convenience of installation, the third conductive terminal and the fourth conductive terminal are respectively installed on the end covers at both ends of the fin of the outdoor heat exchanger.

[0169] 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.

[0170] 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 fan speed), and set the opening of the electronic expansion valve to the set outdoor unit frosting opening; so that the outdoor heat exchanger enters the frosting stage.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] In some other embodiments of the present application, in the outdoor cleaning mode, after executing the outdoor light frost rinsing mode m times, the outdoor valve opening defrosting mode is executed again; in the outdoor valve opening defrosting mode, the following steps are performed, see Figure 8 shown.

[0175] Step S61: Under heating conditions, the compressor is controlled to run (at the second set frequency), the outdoor fan stops rotating, the indoor fan rotates (at the set indoor unit speed), and the opening of the electronic expansion valve is adjusted to the set outdoor unit frosting opening, so that the outdoor heat exchanger enters the frosting stage.

[0176] 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.

[0177] Step S62: Detecting the current value between the third conductive terminal and the fourth conductive terminal.

[0178] Step S63: Determine whether the current value between the third conductive terminal and the fourth conductive terminal is ∈(0, third current threshold].

[0179] If the current value between the third conductive terminal and the fourth conductive terminal is not within the range of (0, third current threshold], the process returns to step S62.

[0180] If the current value between the third conductive terminal and the fourth conductive terminal is within the range of (0, third current threshold], 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.

[0181] Step S64: increasing the opening of the electronic expansion valve to the set outdoor unit defrosting opening, so that the outdoor heat exchanger enters the defrosting stage.

[0182] When the opening of the electronic expansion valve increases to the set outdoor unit defrost opening, the refrigerant flow 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.

[0183] During the defrost stage, the surface of the outdoor heat exchanger begins to defrost, washing away the dust and achieving defrost rinsing.

[0184] Step S65: Detecting the current value between the third conductive terminal and the fourth conductive terminal.

[0185] Step S66: determining whether the current value between the third conductive terminal and the fourth conductive terminal is greater than or equal to a fourth current threshold.

[0186] If the current value between the third conductive terminal and the fourth conductive terminal is less than the fourth current threshold, the process returns to step S65.

[0187] If the current value between the third conductive terminal and the fourth conductive terminal is greater than or equal to the fourth current threshold, step S67 is executed: determining that the outdoor heat exchanger has completed defrosting.

[0188] After defrosting is completed, the opening of the electronic expansion valve is reduced to the set outdoor unit frost opening, and the outdoor heat exchanger can start frosting again.

[0189] Among them, the set outdoor unit frost opening < set outdoor unit defrost opening ≤ the maximum opening of the electronic expansion valve.

[0190] Under the heating condition, the inner fan is controlled to rotate and the outer fan is stopped, 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 current value between the third conductive terminal and the fourth conductive terminal is within the range of (0, the third current threshold], it is determined that the outdoor heat exchanger has reached a slightly frosted state, and the opening of the electronic expansion valve is increased to the set outdoor unit defrost opening, 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 current value between the third conductive terminal and the fourth conductive terminal is greater than or equal to the fourth current threshold, it is determined that the outdoor heat exchanger has completed defrosting; through slightly frost stripping and defrosting rinsing, the outdoor heat exchanger can achieve a better cleaning effect in a shorter time.

[0191] By adjusting the opening of the electronic expansion valve (switching between setting the outdoor unit frost opening and setting the outdoor unit defrost opening), frosting and defrosting are controlled to achieve switching between frosting and defrosting stages; whether micro-frost and defrosting are completed is judged by the current value between the third conductive terminal and the fourth conductive terminal, and the switching speed between the frosting and defrosting stages is fast, so that the outdoor heat exchanger can be cleaned in a shorter time.

[0192] The air conditioner heat exchanger cleaning method of this embodiment, in the outdoor unit cleaning mode, after executing the outdoor unit light frost rinsing mode m times, then executes the following steps: in 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; detect the current value between the third conductive terminal and the fourth conductive terminal, when the current value between the third conductive terminal and the fourth conductive terminal ∈(0, the third current threshold], it is determined that the outdoor heat exchanger has reached the light frost state, and the opening of the electronic expansion valve is increased to the set Determine the defrost opening of the outdoor unit; detect the current value between the third conductive terminal and the fourth conductive terminal, and when the current value between the third conductive terminal and the fourth conductive terminal is greater than or equal to the fourth current threshold, determine that the outdoor heat exchanger has completed defrosting; through m times of outdoor unit micro-frost rinsing mode and one time of outdoor unit valve opening defrosting mode, m+1 frosting and defrosting processes are realized, that is, m+1 times of micro-frost stripping and defrost rinsing are realized, the cleaning effect of the outdoor heat exchanger is improved, and the cleaning time is shortened, which solves the technical problems of poor cleaning effect and long cleaning time of the outdoor heat exchanger.

[0193] 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 unit valve opening 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 unit valve opening defrosting mode is not limited.

[0194] Embodiment 2

[0195] Based on the design of the air conditioner heat exchanger cleaning method of the first embodiment, the second embodiment proposes an air conditioner, which adopts the air conditioner heat exchanger cleaning method of the first embodiment.

[0196] The air conditioner of this 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, the following steps are executed: in the refrigeration condition, the compressor is controlled to run, the outdoor fan is rotated, and the indoor fan is stopped; the opening degree of the electronic expansion valve is set to the frosting opening degree of the indoor unit; the current value between the first conductive terminal and the second conductive terminal is detected, and when the current value between the first conductive terminal and the second conductive terminal is ∈(0, the first current threshold], it is determined that the indoor heat exchanger has reached a light frost state, and the indoor fan is controlled to rotate or the outdoor fan is stopped; the current value between the first conductive terminal and the second conductive terminal is detected, and when the current value between the first conductive terminal and the second conductive terminal is greater than or equal to the second current threshold, 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.

[0197] 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: in the heating condition, the compressor is controlled to run, the outdoor fan stops rotating, and the indoor fan rotates; the opening degree of the electronic expansion valve is set to the outdoor unit frosting opening degree; the current value between the third conductive terminal and the fourth conductive terminal is detected, and when the current value between the third conductive terminal and the fourth conductive terminal is ∈(0, the third current threshold], it is determined that the outdoor heat exchanger reaches a light frost state, and the outdoor fan is controlled to rotate; the current value between the third conductive terminal and the fourth conductive terminal is detected, and when the current value between the third conductive terminal and the fourth conductive terminal is greater than or equal to the fourth current threshold, 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.

[0198] 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. A method for cleaning an air conditioner heat exchanger, characterized in that: A first conductive terminal and a second conductive terminal are arranged on the surface of the indoor heat exchanger at intervals; the cleaning 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, and the indoor fan stops rotating; the opening of the electronic expansion valve is set to the frosting opening of the indoor unit; Detecting the current value between the first conductive terminal and the second conductive terminal, and when the detected current value ∈ (0, first current threshold], controlling the inner fan to rotate or the outer fan to stop rotating; Detecting a current value between the first conductive terminal and the second conductive terminal, and determining that the indoor heat exchanger has completed defrosting when the detected current value is greater than or equal to a second current threshold; Wherein, the first current threshold is less than the second current threshold.

2. The method for cleaning an air conditioner heat exchanger according to claim 1, characterized in that: When the internal fan is controlled to stop rotating, the first brake device is used to control the internal fan to stop rotating; When the external fan is controlled to stop rotating, the second braking device is used to control the external fan to stop rotating.

3. The method for cleaning an air conditioner heat exchanger according to claim 1, characterized in that: In the indoor unit cleaning mode, the air guide plate at the air outlet of the indoor unit of the air conditioner is opened.

4. The method for cleaning an air conditioner heat exchanger 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; After the first set time, the internal fan is controlled to rotate.

5. The method for cleaning an air conditioner heat exchanger according to claim 1, characterized in that: In the internal machine cleaning mode, after executing the internal machine light frost rinsing mode n times, perform the following steps: 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; Detecting the current value between the first conductive terminal and the second conductive terminal, and when the detected current value ∈ (0, first current threshold], increasing the opening of the electronic expansion valve to the set indoor defrosting opening; Detecting a current value between the first conductive terminal and the second conductive terminal, and determining that the indoor heat exchanger has completed defrosting when the detected current value is greater than or equal to a second current threshold; Among them, the set opening degree of the indoor unit for frosting is less than the set opening degree of the indoor unit for defrosting.

6. The method for cleaning an air conditioner heat exchanger according to any one of claims 1 to 5, characterized in that: A third conductive terminal and a fourth conductive terminal are arranged on the surface of the outdoor heat exchanger at intervals; the cleaning 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, and the indoor fan rotates; the opening of the electronic expansion valve is set to the frosting opening of the outdoor unit; Detecting the current value between the third conductive terminal and the fourth conductive terminal, and when the detected current value ∈ (0, third current threshold], controlling the external fan to rotate; Detecting a current value between the third conductive terminal and the fourth conductive terminal, and determining that defrosting of the outdoor heat exchanger is completed when the detected current value is greater than or equal to a fourth current threshold; The third current threshold is less than the fourth current threshold.

7. The method for cleaning an air conditioner heat exchanger 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; After the second set time, the external fan is controlled to rotate.

8. The method for cleaning an air conditioner heat exchanger according to claim 6, characterized in that: In the outdoor cleaning mode, after executing the outdoor light frost rinse mode m times, perform the following steps: 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; Detecting the current value between the third conductive terminal and the fourth conductive terminal, and when the detected current value ∈(0, third current threshold], increasing the opening of the electronic expansion valve to the set external unit defrosting opening; Detecting a current value between the third conductive terminal and the fourth conductive terminal, and determining that defrosting of the outdoor heat exchanger is completed when the detected current value is greater than or equal to a fourth current threshold; Among them, the set outdoor unit frost opening is less than the set outdoor unit defrost opening.

9. The method for cleaning an air conditioner heat exchanger according to claim 6, characterized in that: The first conductive terminal and the second conductive terminal are arranged at intervals on the same fin of the indoor heat exchanger; or, the first conductive terminal and the second conductive terminal are respectively arranged on two end covers of the indoor heat exchanger; The third conductive terminal and the fourth conductive terminal are arranged at intervals on the same fin of the outdoor heat exchanger; or, the third conductive terminal and the fourth conductive terminal are respectively arranged on two end covers of the outdoor heat exchanger.

10. An air conditioner, characterized in that: A method for cleaning an air conditioner heat exchanger as claimed in any one of claims 1 to 9 is adopted.

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