Air conditioner, control method and device thereof, storage medium and computer program product

Abstract

The application discloses a kind of air conditioner control method, device, air conditioner, storage medium and computer program product, the method comprises: in the case where allowing to open the water removal mode of air conditioner, in the process of refrigeration mode operation, if it is determined that receiving refrigeration mode shutdown instruction, and determine that there is no user in room, then control refrigeration mode is closed, and open water removal mode;In water removal mode, according to the temperature data of the easy-to-corrode part of indoor heat exchanger, the water film thickness data formed on the indoor heat exchanger is determined to determine the operating parameters of the compressor;Control four-way valve commutation to make air conditioner execute the heating mode of air conditioner, control indoor fan shutdown, control compressor according to the determined operating parameters of the compressor to run to dry indoor heat exchanger.The scheme, according to the temperature data of the easy-to-corrode part of evaporator after refrigeration operation ends, the parameters of heating operation are determined to dry the evaporator, improve the operation reliability of air conditioner, prolong the service life of air conditioner.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and particularly relates to an air conditioner control method and device, an air conditioner, a storage medium and a computer program product, in particular to an air conditioner corrosion prevention control method and device, an air conditioner, a storage medium and a computer program product. BACKGROUND

[0002] With the increase in air conditioner sales and the deterioration of air conditioner use environment, the air conditioner abnormality rate caused by air conditioner corrosion has increased significantly year by year. According to research, all enterprises in the industry are facing the same problem. Statistics of after-sales abnormal data caused by air conditioner corrosion found that the problem was concentrated in the corrosion of air conditioner heat exchange system components leading to refrigerant leakage. Further analysis found that refrigerant leakage at the U-tube of the heat exchanger (such as indoor heat exchanger and outdoor heat exchanger) in the air conditioner heat exchange system and refrigerant leakage at the elbow were the main problem points. Therefore, air conditioner corrosion prevention has become an urgent technical problem to be solved.

[0003] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0004] The purpose of the present application is to provide an air conditioner control method and device, an air conditioner, a storage medium and a computer program product to solve the problem of refrigerant leakage at the U-tube and / or elbow of the heat exchanger in the air conditioner heat exchange system due to corrosion, affecting the operation reliability and service life of the air conditioner. The effect of determining the heating operation parameters to dry the evaporator according to the temperature data of the easily corroded parts of the evaporator after the end of the refrigeration operation, avoiding refrigerant leakage caused by the corrosion of the easily corroded parts of the evaporator due to moisture, is achieved to improve the operation reliability of the air conditioner and prolong the service life of the air conditioner.

[0005] The application provides a control method of an air conditioner, the air conditioner has an indoor unit and an outdoor unit, the indoor unit has an indoor heat exchanger and an indoor fan, and the outdoor unit has a compressor and a four-way valve; the air conditioner has a water removal mode and can at least dry a corrosion-prone part of the indoor heat exchanger; the control method of the air conditioner comprises the following steps: when the water removal mode of the air conditioner is allowed to be started, determining whether a closing instruction of the cooling mode of the air conditioner is received during the operation of the cooling mode of the air conditioner, and determining whether there is a user in a room where the air conditioner is located; if it is determined that the closing instruction of the cooling mode of the air conditioner is received and there is no user in the room where the air conditioner is located, the cooling mode of the air conditioner is controlled to be closed, and the water removal mode of the air conditioner is started; in the water removal mode of the air conditioner, temperature data of the corrosion-prone part of the indoor heat exchanger is obtained; the water film thickness data formed on the indoor heat exchanger is determined according to the temperature data of the corrosion-prone part of the indoor heat exchanger; the operation parameter of the compressor is determined according to the water film thickness data formed on the indoor heat exchanger; the four-way valve is controlled to reverse to make the air conditioner execute the heating mode of the air conditioner, the indoor fan is controlled to stop, and the compressor is controlled to operate according to the determined operation parameter of the compressor to at least dry the corrosion-prone part of the indoor heat exchanger until the heating mode of the air conditioner is exited.

[0006] In some embodiments, the corrosion-prone part of the indoor heat exchanger comprises at least one of the following: a bottom part of a coil of the indoor heat exchanger, and a bend part of a connecting pipe of the coil of the indoor heat exchanger; the temperature data of the corrosion-prone part of the indoor heat exchanger comprises any one of the following temperature data: temperature data of the bottom part of the coil of the indoor heat exchanger, temperature data of the bend part of the connecting pipe of the coil of the indoor heat exchanger, and an average value or a weighted average value of the temperature data of the bottom part of the coil of the indoor heat exchanger and the temperature data of the bend part of the connecting pipe of the coil of the indoor heat exchanger.

[0007] In some embodiments, the water film thickness data formed on the indoor heat exchanger is determined according to the temperature data of the corrosion-prone part of the indoor heat exchanger, comprising: according to a corresponding relationship between the set temperature data and the set water film thickness data, the set water film thickness data corresponding to the set temperature data same as the temperature data of the corrosion-prone part of the indoor heat exchanger in the corresponding relationship is determined as the water film thickness data corresponding to the temperature data of the corrosion-prone part of the indoor heat exchanger, as the water film thickness data formed on the indoor heat exchanger.

[0008] In some embodiments, the operation parameter of the compressor includes at least one of the following: an operation frequency of the compressor; and the operation parameter of the compressor is determined according to the water film thickness data formed on the indoor heat exchanger, including: according to a correspondence between the set water film thickness data and the set operation parameter, determining the set operation parameter corresponding to the same set water film thickness data in the correspondence as the operation parameter corresponding to the water film thickness data formed on the indoor heat exchanger, as the operation parameter of the compressor.

[0009] In some embodiments, the reversing of the four-way valve is controlled to make the air conditioner execute the heating mode of the air conditioner, the indoor fan is controlled to stop, and the compressor is controlled to operate according to the determined operation parameter of the compressor, including: the reversing of the four-way valve is controlled to start the heating mode of the air conditioner, after the heating mode of the air conditioner is started, the indoor fan is controlled to stop, and the compressor is controlled to operate according to the determined operation parameter of the compressor; after a first set time, it is determined whether the water film thickness data formed on the indoor heat exchanger has been reduced to below a set water film thickness data threshold; if it is determined that the water film thickness data formed on the indoor heat exchanger has been reduced to below the set water film thickness data threshold, the compressor is controlled to stop, and the heating mode of the air conditioner is exited; if it is determined that the water film thickness data formed on the indoor heat exchanger has not been reduced to below the set water film thickness data threshold, a new operation parameter of the compressor is determined according to the water film thickness data formed on the indoor heat exchanger, and the compressor is controlled to operate according to the determined new operation parameter of the compressor, and the cycle is repeated.

[0010] In some embodiments, at least one of the following is further included: after the heating mode of the air conditioner is exited, the indoor fan is controlled to be turned on and reversed for a second set time to further reduce the air humidity at the indoor heat exchanger and to perform self-cleaning on the filter screen at the air inlet of the indoor unit; wherein the coil surface of the indoor heat exchanger is coated with a corrosion-resistant coating; in the case that the air conditioner has a preset sterilization mode of the air conditioner, after the heating mode of the air conditioner is exited, the sterilization mode of the air conditioner is started to perform self-cleaning on the indoor unit.

[0011] According to the method, the application provides a control device of an air conditioner. The air conditioner has an indoor unit and an outdoor unit. The indoor unit has an indoor heat exchanger and an indoor fan. The outdoor unit has a compressor and a four-way valve. The air conditioner has a water removal mode, which can at least dry the corrosion-prone part of the indoor heat exchanger. The control device of the air conditioner comprises: a control unit configured to determine whether a shutdown instruction of the cooling mode of the air conditioner is received and whether there is a user in the room where the air conditioner is located during the operation of the cooling mode of the air conditioner if the water removal mode of the air conditioner is allowed to be started; the control unit is further configured to control the cooling mode of the air conditioner to be shut down and the water removal mode of the air conditioner to be started if it is determined that the shutdown instruction of the cooling mode of the air conditioner is received and there is no user in the room where the air conditioner is located; an acquisition unit configured to acquire temperature data of the corrosion-prone part of the indoor heat exchanger in the water removal mode of the air conditioner; the control unit is further configured to determine water film thickness data formed on the indoor heat exchanger according to the temperature data of the corrosion-prone part of the indoor heat exchanger; the control unit is further configured to determine the operation parameter of the compressor according to the water film thickness data formed on the indoor heat exchanger; the control unit is further configured to control the four-way valve to reverse so that the air conditioner performs the heating mode of the air conditioner, control the indoor fan to be shut down, and control the compressor to operate according to the determined operation parameter of the compressor to at least dry the corrosion-prone part of the indoor heat exchanger until the heating mode of the air conditioner is exited.

[0012] In some embodiments, the corrosion-prone part of the indoor heat exchanger comprises at least one of the following: a bottom part of a coil of the indoor heat exchanger, and a bend part of a connecting pipe of the coil of the indoor heat exchanger; the temperature data of the corrosion-prone part of the indoor heat exchanger comprises any one of the following temperature data: temperature data of the bottom part of the coil of the indoor heat exchanger, temperature data of the bend part of the connecting pipe of the coil of the indoor heat exchanger, and an average or weighted average of the temperature data of the bottom part of the coil of the indoor heat exchanger and the temperature data of the bend part of the connecting pipe of the coil of the indoor heat exchanger.

[0013] In some embodiments, the control unit determines the water film thickness data formed on the indoor heat exchanger according to the temperature data of the corrosion-prone part of the indoor heat exchanger, comprising: determining, according to a correspondence between the set temperature data and the set water film thickness data, the set water film thickness data corresponding to the set temperature data identical to the temperature data of the corrosion-prone part of the indoor heat exchanger in the correspondence as the water film thickness data corresponding to the temperature data of the corrosion-prone part of the indoor heat exchanger, as the water film thickness data formed on the indoor heat exchanger.

[0014] In some embodiments, the operation parameter of the compressor includes at least one of the following: an operation frequency of the compressor; and the control unit determines the operation parameter of the compressor according to the water film thickness data formed on the indoor heat exchanger, including: according to a correspondence between the set water film thickness data and the set operation parameter, determining the set operation parameter corresponding to the same set water film thickness data in the correspondence as the operation parameter corresponding to the water film thickness data formed on the indoor heat exchanger, as the operation parameter of the compressor.

[0015] In some embodiments, the control unit controls the four-way valve to reverse to make the air conditioner execute the heating mode of the air conditioner, controls the indoor fan to stop, and controls the compressor to operate according to the determined operation parameter of the compressor, including: controlling the four-way valve to reverse to start the heating mode of the air conditioner, controlling the indoor fan to stop after the heating mode of the air conditioner is started, and controlling the compressor to operate according to the determined operation parameter of the compressor; after a first set time, determining whether the water film thickness data formed on the indoor heat exchanger has been reduced to below a set water film thickness data threshold value; if it is determined that the water film thickness data formed on the indoor heat exchanger has been reduced to below the set water film thickness data threshold value, controlling the compressor to stop and exiting the heating mode of the air conditioner; and if it is determined that the water film thickness data formed on the indoor heat exchanger has not been reduced to below the set water film thickness data threshold value, determining new operation parameters of the compressor according to the water film thickness data formed on the indoor heat exchanger again, and controlling the compressor to operate according to the determined new operation parameters of the compressor, to form a cycle.

[0016] In some embodiments, the control unit is further configured to, after exiting the heating mode of the air conditioner, control the indoor fan to start and reverse for a second set time to further reduce the air humidity at the indoor heat exchanger and to perform self-cleaning on the filter screen at the air inlet of the indoor unit; the coil surface of the indoor heat exchanger is coated with a corrosion-resistant coating; and the control unit is further configured to, in a case where the air conditioner has a preset sterilization mode of the air conditioner, start the sterilization mode of the air conditioner to perform self-cleaning on the indoor unit after exiting the heating mode of the air conditioner.

[0017] In another aspect, the present application provides an air conditioner matched with the above device, including the above-mentioned control device of the air conditioner.

[0018] In another aspect, the present application provides a storage medium matched with the above method, including a stored program, wherein when the program is running, the device where the storage medium is located executes the steps of the above-mentioned control method of the air conditioner.

[0019] Accordingly, the present application provides a computer program product comprising a computer program which, when executed by a processor, implements the steps of the above-mentioned control method of an air conditioner.

[0020] Thus, the present application provides a control method of an air conditioner, which comprises the following steps: in the case that a dehumidification mode of the air conditioner is started, if a shutdown of a refrigeration mode is received during a refrigeration operation of the air conditioner, the air conditioner is automatically switched to a heating mode to start the dehumidification mode in the case that no one is in a room; in the dehumidification mode, temperature data of an easily-corroded part (e.g. a U bottom 1 and an elbow 2) of an evaporator is detected, water amount data (e.g. water film thickness data) of a surface of the evaporator is determined according to the temperature data of the easily-corroded part of the evaporator; dehumidification operation parameters (e.g. a frequency of the compressor and a heating time) of the compressor are determined according to the water amount data of the surface of the evaporator, the compressor is controlled to operate according to the determined dehumidification operation parameters of the compressor, and an indoor fan is controlled to stop; during the operation of the heating mode, the dehumidification operation parameters of the compressor are dynamically adjusted according to the change of the water amount data of the surface of the evaporator; after the dehumidification mode ends, the indoor fan is controlled to start and reverse to further reduce the humidity at the evaporator, and a filter screen at an air inlet of the indoor unit is cleaned; thus, the parameters of the heating operation are determined according to the temperature data of the easily-corroded part of the evaporator after the refrigeration operation ends to perform a drying treatment on the evaporator, which avoids the easily-corroded part of the evaporator from being corroded due to moisture to cause refrigerant leakage, and is beneficial to improve the operation reliability of the air conditioner and prolong the service life of the air conditioner.

[0021] Other features and advantages of the present application will be set forth in the following description, and in part will be apparent from the description, or can be learned by practice of the present application.

[0022] The technical solutions of the present application will be further described in detail below with reference to the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 a flowchart of an embodiment of the control method of the air conditioner of the present application;

[0024] Figure 2 a flowchart of an embodiment of the method of the present application for controlling the indoor fan to stop and the compressor to operate according to the operation parameters;

[0025] Figure 3 a structural schematic diagram of an embodiment of the control device of the air conditioner of the present application;

[0026] Figure 4 a structural schematic diagram of the evaporator in the split indoor unit;

[0027] Figure 5Structure diagram of U bottom 1 of evaporator;

[0028] Figure 6 Structure diagram of bend 2 of evaporator;

[0029] Figure 7 Structure diagram of bend 2 of evaporator in case of refrigeration and heating;

[0030] Figure 8 Structure diagram of bend 2 of evaporator in case of condensation;

[0031] Figure 9 Structure diagram of U bottom 1 of evaporator after air conditioner is turned off in case of refrigeration;

[0032] Figure 10 Structure diagram of simulated corrosion case for U bottom 1 of evaporator Figure 1 ;

[0033] Figure 11 Structure diagram of simulated corrosion case for U bottom 1 of evaporator Figure 2 ;

[0034] Figure 12 Comparative diagram of control logic of air conditioner;

[0035] Figure 13 Table of temperature of each test point near indoor unit in room after air conditioner is turned off normally, i.e., table 1;

[0036] Figure 14 Table of temperature of each test point near indoor unit in room after air conditioner is turned off after heating for 5 minutes, i.e., table 2.

[0037] In combination with the drawings, the following are the meanings of the reference signs in the embodiments of the present application:

[0038] 1-U bottom; 2-bend; 102-acquisition unit; 104-control unit. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0040] Considering that the U tube (such as U bottom 1) and / or the elbow 2 of the heat exchanger in the heat exchange system of the air conditioner are corroded to cause refrigerant leakage, the operation reliability and service life of the air conditioner are affected. In addition, some air conditioner diseases caused by the breeding of bacteria and fungi in the indoor unit of the air conditioner and peculiar smell are common problems in the industry, which seriously affect the comfort of the customer's use experience.

[0041] Therefore, the scheme of the present application provides an air conditioner control method, in particular, an anti-corrosion control method of an air conditioner. When the air conditioner is shut down in the cooling mode, a heating program is started. The surface water amount of the U bottom 1 and the elbow 2 of the evaporator is determined by the temperature data of the U bottom 1 and the elbow 2 of the evaporator. According to the water amount, the frequency of the set different compressors and the water removal mode of the heating time are selected. On the premise of not increasing the material cost, the service life of the air conditioner is greatly improved, and the growth and reproduction of microorganisms can be effectively inhibited, so as to eradicate the air conditioner disease and peculiar smell problem from the source.

[0042] According to an embodiment of the present application, an air conditioner control method is provided, as shown in Figure 1 The flowchart of an embodiment of the method of the present application is shown. The air conditioner has an indoor unit and an outdoor unit. The indoor unit has an indoor heat exchanger and an indoor fan. The outdoor unit has a compressor and a four-way valve. The air conditioner has a water removal mode, which can at least dry the easy corrosion parts of the indoor heat exchanger. The indoor heat exchanger has easy corrosion parts, which are the parts of the indoor heat exchanger that are easily corroded by condensate water and the like. In the scheme of the present application, as shown in Figure 1 The air conditioner control method comprises steps S110 to S160.

[0043] At step S110, in the case where the water removal mode of the air conditioner is allowed to be started, during the operation of the cooling mode of the air conditioner, it is determined whether a shutdown instruction of the cooling mode of the air conditioner is received, and it is determined whether there is a user in the room where the air conditioner is located. The scheme of the present application also adopts a convenient technology. The shutdown command triggers a reverse heating program at the same time, does not increase the additional action of the customer, and eliminates the hidden danger that the water removal mode of the air conditioner is not started due to human reasons. In addition, the infrared human body scanning detection technology is added to start the drying and heating program after determining that there is no one in the room.

[0044] At step S120, if it is determined that the shutdown instruction of the cooling mode of the air conditioner is received, and it is determined that there is no user in the room where the air conditioner is located, the cooling mode of the air conditioner is controlled to be turned off, and the water removal mode of the air conditioner is started.

[0045] At step S130, in the water removal mode of the air conditioner, the temperature data of the easy corrosion parts of the indoor heat exchanger is obtained.

[0046] In some embodiments, the easily corroded parts of the indoor heat exchanger include at least one of the following: the bottom part of the coil of the indoor heat exchanger (such as the U-bottom 1 of the evaporator), and the elbow part of the connecting pipe of the coil of the indoor heat exchanger (such as the elbow 2 of the evaporator).

[0047] Accordingly, the temperature data of the easily corroded parts of the indoor heat exchanger includes any of the following temperature data: the temperature data of the bottom part of the coil of the indoor heat exchanger, the temperature data of the elbow part of the connecting pipe of the coil of the indoor heat exchanger, and the average or weighted average of the temperature data of the bottom part of the coil of the indoor heat exchanger and the temperature data of the elbow part of the connecting pipe of the coil of the indoor heat exchanger.

[0048] Preferably, in practical applications, it is only necessary to collect the temperature data of the bottom part of the coil of the indoor heat exchanger, because the refrigerant flow rate inside the coil of the indoor heat exchanger is fast and the temperature difference of the entire coil of the indoor heat exchanger is small. Collecting the temperature data of the bottom part of the coil of the indoor heat exchanger can accurately obtain the temperature data of the coil of the indoor heat exchanger.

[0049] Figure 4 This is a schematic diagram of the evaporator in a split indoor unit. Figure 5 This is a schematic diagram of the U-shaped base of the evaporator. Figure 6 This is a schematic diagram of the structure of elbow 2 in the evaporator. Figure 4 , Figure 5 and Figure 6 As shown, in the split indoor unit of an air conditioner, the evaporator has a U-shaped base 1 and an elbow 2. The solution of this invention determines the amount of water on the surface of the evaporator's U-shaped base 1 and elbow 2 by analyzing the temperature data of these easily corroded parts after the air conditioner has finished cooling operation. Based on the water level, different compressor frequencies and heating times are selected for dewatering modes. The temperature data of these easily corroded parts can be obtained by placing temperature probes on these parts. Using this solution, the evaporator is dried as a whole after the air conditioner has finished cooling operation, removing the highly corrosive liquid film adhering to the elbow 2 and U-shaped base of the evaporator, effectively solving the problem of air conditioner corrosion. Heating the evaporator fins removes the liquid film from the fins and high-temperature baking effectively inhibits the growth and reproduction of microorganisms, addressing air conditioner-related illnesses and odors at their source.

[0050] The solution of this invention adopts a highly efficient anti-corrosion technology. By independently conducting a large number of tests and combining them with after-sales statistical data, it was determined that the U-bottom 1 of the evaporator is the weak point in anti-corrosion. The water film is the key factor affecting the corrosion of the U-bottom 1 of the evaporator. Before the heating program runs, the temperature data of the U-bottom 1 of the evaporator is collected to determine the thickness of the water film on the U-bottom 1 of the evaporator, and the drying program is called to dry and remove water, so as to achieve a precise anti-corrosion effect.

[0051] In the scheme of the present application, the acquisition of the substrate temperature of the U bottom 1 of the evaporator is specifically described as follows:

[0052] First, the U bottom 1 of the evaporator is a corrosion weak point of the air conditioning system. On the one hand, during the production and manufacturing process, the wall thickness of the U bottom 1 of the evaporator is thinned, which is the thinnest part of the U bottom 1 of the evaporator in the entire circuit system. In addition, due to the structure, the condensed water in the U bottom 1 of the evaporator is not easy to evaporate after the air conditioner is turned off (as shown in Figure 9 ), and the corrosion medium SO2, H2S, CO2 and NH3 in the air dissolves in the water film to become a strong corrosion medium, the PH value of the liquid film decreases, and the acidic environment formed is the electrochemical corrosion of the substrate, which causes the U bottom 1 to corrode rapidly to the cold leakage. The present application focuses on drying the condensed water in the U bottom 1, completely cutting off the electrochemical corrosion circuit of the substrate, and the corrosion resistance of the U bottom 1 is at least increased by more than 4 times, as shown in Figure 10 and Figure 11 . Figure 9 The schematic diagram of the state of the U bottom 1 of the evaporator after the air conditioner is turned off, Figure 10 The schematic diagram of the simulated corrosion of the U bottom 1 of the evaporator Figure 1 , Figure 11 The schematic diagram of the simulated corrosion of the U bottom 1 of the evaporator Figure 2 .

[0053] Second, in the related scheme, the temperature test is collected by collecting the temperature of the evaporator coil or the environment temperature. Compared with the scheme of collecting the U bottom 1 substrate temperature of the evaporator in the present application, there is data lag, the evaporator coil point temperature is different, the environment temperature is greatly different from the evaporator temperature, and changes slowly. The scheme of the present application directly collects the U bottom 1 substrate temperature of the evaporator, judges the water film formed by the condensed water on the evaporator through the U bottom 1 substrate temperature of the evaporator, and calls the frequency of different compressors. It can control the working condition of the compressor faster and more accurately, so as to dry the water film in the U bottom 1 of the evaporator in the shortest time and the lowest power consumption.

[0054] At step S140, in the water removal mode of the air conditioner, according to the temperature data of the easy-corrosion part of the indoor heat exchanger, the water film thickness data formed on the indoor heat exchanger is determined.

[0055] In some embodiments, in the water removal mode of the air conditioner in step S140, the water film thickness data formed on the indoor heat exchanger is determined according to the temperature data of the corrosion-prone position of the indoor heat exchanger, including: according to the correspondence between the set temperature data and the set water film thickness data, the set water film thickness data corresponding to the set temperature data in the correspondence is determined as the water film thickness data corresponding to the temperature data of the corrosion-prone position of the indoor heat exchanger, as the water film thickness data formed on the indoor heat exchanger. For example: through the probe, the temperature data of the corrosion-prone position of the evaporator (such as U bottom 1) and the indoor humidity data are monitored in real time, the amount of condensate water on the two end coils of the evaporator is automatically calculated according to the above data, and the above condensate water amount is matched with the set water amount (i.e. water film thickness) data, and the corresponding pre-set drying water removal mode is selected and called.

[0056] In the use process of the air conditioner, after the air conditioner cools, a large amount of liquid film is attached to the evaporator due to condensation. For the exposed copper pipes at both ends of the evaporator, the corrosive medium in the air is dissolved in the above-mentioned liquid film, and the liquid film forms a loop with the base material to constitute electrochemical corrosion, which accelerates the corrosion of the corrosion-prone positions of the evaporator such as U bottom 1 and elbow 2. The above process is a key process that determines the service life of the air conditioner. In addition, for the pipe fin part of the evaporator, a large amount of condensate water is easy to breed bacteria and fungi. If people inhale the above microorganisms for a long time in a closed space, a series of respiratory diseases will occur, which may cause dizziness and headache, or even bacterial infection. Therefore, in the scheme of the present application, after the air conditioner cools and shuts down, the heating mode is switched, the frequency of the compressor is controlled according to the pipe temperature of the evaporator, and the running time of the heating mode is determined according to the pipe temperature of the evaporator. The specific pipe temperature of the evaporator is the temperature of U bottom 1 and elbow 2. The running time of the heating mode is determined according to the pipe temperature of the evaporator. Before the heating program runs, the scheme of the present application clearly checks the position of U bottom 1 of the evaporator. Because a large number of experiments are independently carried out and combined with after-sales statistical data, it is determined that U bottom 1 of the evaporator is a weak point of corrosion prevention, and the water film is a key factor affecting the corrosion of U bottom 1 when the water film is affected. Therefore, the main research object of the scheme of the present application is the water film when U bottom 1 is affected. By collecting the temperature data of U bottom 1 of the evaporator, the water film thickness of U bottom 1 of the evaporator is judged, and the drying program is called to dry and remove water.

[0057] At step S150, in the water removal mode of the air conditioner, the running parameter of the compressor is determined according to the water film thickness data formed on the indoor heat exchanger.

[0058] In some embodiments, the running parameter of the compressor includes at least one of the following: the running frequency of the compressor, the running frequency of the compressor.

[0059] In step S150, in the water removal mode of the air conditioner, the operation parameter of the compressor is determined according to the water film thickness data formed on the indoor heat exchanger, including: according to the correspondence between the set water film thickness data and the set operation parameter, the set operation parameter corresponding to the set water film thickness data which is the same as the water film thickness data formed on the indoor heat exchanger in the correspondence is determined as the operation parameter corresponding to the water film thickness data formed on the indoor heat exchanger, as the operation parameter of the compressor. For example: through the probe, the temperature data of the evaporator corrosion prone part (such as U bottom 1) and the indoor humidity data are monitored in real time, the condensate amount (water film thickness) on the two end coils of the evaporator is automatically calculated according to the above data, according to the correspondence between the set water film thickness data and the set operation parameter, the set operation parameter corresponding to the set water film thickness data which is the same as the water film thickness data formed on the indoor heat exchanger in the correspondence is determined as the operation parameter corresponding to the water film thickness data formed on the indoor heat exchanger, as the operation parameter of the compressor.

[0060] Figure 7 It is a schematic diagram of the elbow 2 of the evaporator in the refrigeration and heating conditions. The water film condensed on the elbow 2 of the evaporator after the air conditioner is refrigerated, which can be completely dried by heating for about 3 min under the premise of closing the cross-flow fan blades of the indoor fan and without affecting the indoor temperature rise, as shown in Figure 7 .

[0061] Figure 8 It is a schematic diagram of the elbow 2 of the evaporator in the condensation state. During the refrigeration process of the air conditioner, a large amount of water film will be condensed on the U end (i.e. U bottom 1) of the evaporator and the surface of the small elbow 2, and the corrosion medium SO2, H2S, CO2 and H3N in the air can be dissolved in the water film to become strong corrosion medium, accelerating the corrosion of the base material. After the air conditioner is turned off in the refrigeration mode, the condensation state of the elbow 2 of the evaporator is as shown in Figure 8 . Under the condition of natural placement, indoor temperature of 28℃ and humidity of 86%, the duration of water droplets and liquid film is about 120 min, and the electrochemical corrosion formed by the liquid film and the exposed base material directly affects the corrosion life of the air conditioner.

[0062] The air conditioner is turned off in the cooling mode, and the dehumidification mode of the air conditioner is automatically started, that is, the heating mode is automatically started, the temperature data of the U bottom 1 and the elbow 2 of the evaporator are obtained by the temperature probe, the built-in logic program judges the water amount on the surface of the U bottom 1 and the elbow 2 of the evaporator according to the temperature data of the U bottom 1 and the elbow 2 of the evaporator, the dehumidification mode of the heating time and the frequency of the compressor set according to the water amount is selected, after the mode is selected, the four-way valve of the air conditioner is reversed in the heating mode, the high-temperature and high-pressure refrigerant vapor discharged by the compressor flows to the indoor heat exchanger through the four-way valve, the indoor fan is stopped, the cross-flow fan blade of the indoor fan stops working, the heat is prevented from being blown into the room to affect the room temperature rise rate, at the same time, the heat of the concentrated high-temperature refrigerant is transmitted to the liquid film attached to the surface of the evaporator through the refrigerant pipeline and the fins of the evaporator, the high-pressure refrigerant liquid cooled by heat release on the indoor side flows through the capillary throttling, and the low-temperature and low-pressure liquid refrigerant after throttling flows into the outdoor heat exchanger to evaporate, absorbs the heat in the outdoor air, and the low-temperature and low-pressure refrigerant vapor evaporated from the outdoor heat exchanger is sucked into the compressor to be compressed. The cycle is repeated, the liquid film on the evaporator continuously absorbs heat under high-temperature conditions, evaporates quickly, and the electrochemical corrosion loop formed by the liquid film on the evaporator and the base material is quickly disconnected, so that the purpose of preventing the corrosion of the evaporator is achieved; in addition, the fins of the dry evaporator have no fungus and bacteria growth environment, and the high temperature on the pipeline and the fins of the evaporator can effectively kill bacteria and fungus, thereby fundamentally solving the air conditioner disease and odor problem.

[0063] In step S160, in the dehumidification mode of the air conditioner, the four-way valve is controlled to reverse to make the air conditioner execute the heating mode of the air conditioner, the indoor fan is controlled to stop, and the compressor is controlled to operate according to the determined operating parameters of the compressor, so as to at least dry the corrosion-prone parts of the indoor heat exchanger, until the heating mode of the air conditioner is exited.

[0064] The scheme of the present application is to remove the condensed water by running the heating mode according to the temperature data of the corrosion-prone parts of the evaporator after the air conditioner is cooled, mainly for corrosion prevention and bacteria inhibition. The humid environment is a necessary condition for the growth and reproduction of bacteria and microorganisms. By heating and drying to remove water, the growth and reproduction of the above microorganisms are inhibited.

[0065] In some embodiments, in step S160, in the dehumidification mode of the air conditioner, the four-way valve is controlled to reverse to make the air conditioner execute the heating mode of the air conditioner, the indoor fan is controlled to stop, and the compressor is controlled to operate according to the determined operating parameters of the compressor, including:

[0066] The following will be described in combination with Figure 2An embodiment flowchart of controlling the indoor fan to stop and the compressor to run according to the operation parameters in the method of the application is shown, which further illustrates the specific process of controlling the indoor fan to stop and the compressor to run according to the operation parameters in step S160, including steps S210 to S240.

[0067] In step S210, in the water removal mode of the air conditioner, the four-way valve is controlled to reverse to start the heating mode of the air conditioner, after the heating mode of the air conditioner is started, the indoor fan is controlled to stop, and the compressor is controlled to run according to the determined operation parameters of the compressor.

[0068] In step S220, after the first set time, it is determined whether the water film thickness data formed on the indoor heat exchanger has been reduced to below the set water film thickness data threshold.

[0069] In step S230, if it is determined that the water film thickness data formed on the indoor heat exchanger has been reduced to below the set water film thickness data threshold, the compressor is controlled to stop, and the heating mode of the air conditioner is exited.

[0070] In step S240, if it is determined that the water film thickness data formed on the indoor heat exchanger has not been reduced to below the set water film thickness data threshold, the new operation parameters of the compressor are determined again according to the water film thickness data formed on the indoor heat exchanger, and the compressor is controlled to run according to the determined new operation parameters of the compressor, and the cycle is repeated until the water film thickness data formed on the indoor heat exchanger is reduced to below the set water film thickness data threshold, the compressor is controlled to stop, and the heating mode of the air conditioner is exited.

[0071] For example, the stop command of the compressor is mainly triggered according to the temperature data of the U bottom 1 of the evaporator or the set time length, such as when the temperature of the U bottom 1 of the evaporator reaches 70℃ or the compressor has run for 180S, it can be determined that the U bottom 1 of the evaporator has been dried, and the compressor is turned off.

[0072] The scheme of the present application also adopts an energy-saving water removal technology, in the heating program operation, the temperature data of the U bottom 1 of the evaporator is collected in real time, which is indirectly converted into the water film thickness data of the U bottom 1 of the evaporator, according to the water film thickness change of the U bottom 1 of the evaporator, the drying program is called in real time, the advantage is that it is efficient, energy-saving and noise-reducing; and in the drying process, the tubular fan blades of the indoor fan are closed, on the one hand, it can avoid blowing away the refrigerant heat, and can concentrate the power of the compressor for water removal, on the other hand, it can avoid greatly reducing the heat leakage of the heat exchanger to affect the room temperature rise rate. For example: according to the temperature data of the U bottom 1 of the evaporator and the indoor relative humidity data, the condensate water quantity (water film thickness) at both ends of the evaporator coil can be calculated. For example, according to the real-time temperature of the U bottom 1 of the evaporator and the indoor relative humidity, the water quantity V1 is calculated, V1 is between water quantity X1-X2, which meets the calling of water removal mode 1, the measuring system directly calls mode 1 for drying and water removal, and other modes are called in the same way.

[0073] In some embodiments, the control method of the air conditioner of the scheme of the present application further includes at least one of the following at least one auxiliary control situation: a first auxiliary control situation and a second auxiliary control situation.

[0074] The first auxiliary control situation: after exiting the heating mode of the air conditioner, the indoor fan is controlled to be turned on and reversed for a second set time to further reduce the air humidity at the indoor heat exchanger, and to perform self-cleaning on the filter screen at the air inlet of the indoor unit.

[0075] Preferably, the coil surface of the indoor heat exchanger is coated with a corrosion-resistant coating. The water removal and corrosion prevention mode in the scheme of the present application is compatible with the coating corrosion prevention in the related scheme, and the two can be implemented together to achieve a corrosion prevention effect of 1+1>2, realizing efficient and durable corrosion prevention.

[0076] The scheme of the present application also adopts a self-cleaning technology, after the heating program operation is completed, the tubular fan blades of the indoor fan are turned on and reversed, which has the advantages that: on the one hand, the gas humidity in the heat exchanger body shell (i.e. the relatively closed body shell of the indoor unit) is further reduced, on the other hand, the filter screen is reversed to blow and reduce the dirt blocking rate of the filter screen, ensuring sufficient air intake during normal operation and good refrigeration and heating effect.

[0077] In the scheme of the present application, the difference in the motor state of the tubular fan blades of the indoor fan is as follows: in the related scheme, the motor of the tubular fan blades of the indoor fan is turned on, the air deflector is closed or upward, avoiding blowing people, compared with the scheme of the present application, the difference is as follows:

[0078] First, in the scheme of the present application, the motor of the cross-flow fan blade of the indoor fan is in the closed state during the heating and water removal process, which has two advantages: on the one hand, the motor of the indoor fan is closed, reducing the heat exchange between the evaporator and the air, and concentrating the refrigerant heat for water removal, which is more efficient; on the other hand, the heat of the evaporator will not spread to the indoor, causing the indoor temperature to rise significantly, affecting the body sensation; under the use conditions of the scheme of the present application, the temperature difference between the normal shutdown room temperature at each test point and the temperature at each test point in the room after 5 minutes of heating shutdown is <0.1℃, and the short-time heating has little effect on the overall room temperature, as shown in the examples in Table 1 and Table 2. Figure 13 Table 1 is the table of the temperature of each test point near the indoor unit in the normal shutdown room, i.e. Table 1. Figure 14 Table 2 is the table of the temperature of each test point near the indoor unit in the room after 5 minutes of heating shutdown, i.e. Table 2.

[0079] Among them, the temperature measuring probe arranged in the space range near the indoor unit, the data in Table 1 is the temperature of each test point in the normal shutdown room within 3 minutes after shutdown, and the data in Table 2 is the temperature of each test point in the room after 5 minutes of heating shutdown, under the above different conditions, the temperature difference of each point is <0.1℃, which shows that short-time heating has little effect on the overall room temperature and will not affect the user experience.

[0080] Second, in the scheme of the present application, after the water removal is completed, the fan of the cross-flow fan blade of the indoor fan is turned on and reversed, the air inlet of the indoor unit becomes an air outlet, and there is a strong corrosive medium environment, which is generally dusty, and the dust layer is deposited on the mesh cover of the air inlet, which accumulates for a long time, causing the mesh cover to be dirty and blocked, affecting the air intake of the evaporator under normal start-up conditions, and ultimately affecting the cooling effect of the unit; after the water removal is completed, the air inlet of the indoor unit becomes an air outlet, blowing off the dust deposited on the filter screen, achieving the self-cleaning effect of the filter screen and ensuring the normal cooling effect of the unit.

[0081] Figure 12 The comparison diagram of the control logic of the air conditioner. After the water film on the evaporator is completely dried for 180s in the heating mode, the unit automatically stops, and the running logic diagram is as shown in Figure 12 . As Figure 12As shown, after the air conditioner receives a shutdown command in the cooling mode, if the old program is used, the evaporator is still in a humid state after normal shutdown; if the new program is used, the temperature of the U bottom 1 and the elbow 2 of the evaporator is detected, the water amount on the surface of the evaporator is determined according to the temperature detection data of the U bottom 1 and the elbow 2 of the evaporator, the corresponding water removal mode is selected and the heating curve is determined to dry the evaporator, and then the air conditioner is normally shut down. Under the old program, the service life of the evaporator is affected by the influence of electrochemical corrosion, bacteria and fungi breeding, and the like, and problems such as air conditioner disease and peculiar smell are caused, but these problems do not occur under the new program. That is, air conditioner corrosion is a key factor affecting the service life of the air conditioner, and the scheme of the present application greatly improves the service life of the air conditioner without additional material cost, and effectively inhibits the growth and reproduction of microorganisms, and eradicates the air conditioner disease and peculiar smell problem from the source. For example, according to the temperature data of the U bottom 1 of the evaporator and the indoor relative humidity data, the condensate water amount (water film thickness) of the evaporator can be calculated. In addition, the parameters of the heating curve include the operating frequency and the operating time length of the compressor, and the frequency and the time length directly determine the heating rate and the temperature holding time of the evaporator coil, that is, the heating curve; the heating curve calling logic is: for example, according to the real-time temperature and humidity of the U bottom 1 of the evaporator, the water amount V1 is calculated, V1 is between the water amount X1-X2, the preset water removal mode 1 is called, the measurement system directly calls the preset water removal mode 1 for drying and water removal, and other modes are called in the same way.

[0082] The scheme of the present application effectively solves the air conditioner corrosion problem, and solves the problems of bacteria and fungi breeding without additional material cost and without reducing production efficiency, which can greatly improve the service life and use experience of the air conditioner.

[0083] In the related scheme, the corrosion prevention process generates a physical barrier through the corrosion prevention coating, cuts off the contact between the substrate and the environmental corrosion medium, and forms a high-resistance film to block the penetration channels of oxygen, water and corrosive anion and cation media. The corrosion prevention coating is generally an epoxy or acrylic system, which will dissolve itself in long-term immersion in an aqueous solution containing sulfur elements and halogen ammonium ions. At the same time, due to the complex structure of the heat exchanger, the coating corrosion prevention has problems such as low efficiency, uneven coating, and cannot fundamentally solve the heat exchanger corrosion problem. The scheme of the present application is not limited by the structure of the heat exchanger and the type of environmental corrosion medium, does not affect the production efficiency during production and does not produce additional cost during design, and has good corrosion prevention effect.

[0084] The second auxiliary control case: in the case that the air conditioner has a preset sterilization mode of the air conditioner, after the heating mode of the air conditioner is exited, the sterilization mode of the air conditioner is started to perform self-cleaning on the indoor unit.

[0085] In the scheme of the present application, the air conditioner also has an antibacterial and bacteriostatic mode, which can dry the water film on the fin surface of the pipeline and heat exchanger, eliminate the growth environment of bacteria and fungi, and effectively inhibit the growth of bacteria and fungi.

[0086] In the related scheme, the air conditioner sterilizes and disinfects by spraying sterilizing agents, which is harmful to human health and has poor persistence. As the air conditioner cools, the continuously generated condensate continuously flushes the sterilizing agents attached to the fins and pipelines of the heat exchanger, causing the loss of sterilizing agents and the loss of long-term sterilization and antibacterial function. Fungi and bacteria grow repeatedly, and the problem of air conditioner disease and odor cannot be fundamentally solved. However, the present application can effectively solve the problem of air conditioner disease and odor without affecting the normal use of the air conditioner.

[0087] The technical scheme of the present embodiment is adopted. In the case that the water removal mode of the air conditioner is turned on, if the cooling is turned off during the cooling operation of the air conditioner, the heating program is automatically switched to start the water removal mode under the condition that no one is in the room. In the water removal mode, the temperature data of the corrosion-prone parts (such as U bottom 1 and elbow 2) of the evaporator are detected, the water amount data (such as water film thickness data) on the surface of the evaporator is determined according to the temperature data of the corrosion-prone parts of the evaporator, the water removal operation parameters (such as the frequency of the compressor and the heating time) of the compressor are determined according to the water amount data on the surface of the evaporator, the compressor is controlled to operate according to the determined water removal operation parameters of the compressor, and the indoor fan is controlled to stop. During the operation of the heating program, the water removal operation parameters of the compressor are dynamically adjusted according to the change of the water amount data on the surface of the evaporator. After the water removal mode ends, the indoor fan is controlled to be turned on and reversed to further reduce the humidity at the evaporator and clean the filter screen at the air inlet of the indoor unit. Thus, by determining the parameters of the heating operation to dry the evaporator according to the temperature data of the corrosion-prone parts of the evaporator after the cooling operation ends, the corrosion of the corrosion-prone parts of the evaporator due to moisture is avoided, which helps to improve the operation reliability of the air conditioner and prolong the service life of the air conditioner.

[0088] According to the embodiment of the present application, a control device of an air conditioner corresponding to the control method of the air conditioner is also provided. Referring to Figure 3 The structure diagram of an embodiment of the device of the present application is shown. The air conditioner has an indoor unit and an outdoor unit, the indoor unit has an indoor heat exchanger and an indoor fan, and the outdoor unit has a compressor and a four-way valve. The air conditioner has a water removal mode and can at least dry the corrosion-prone parts of the indoor heat exchanger. The indoor heat exchanger has corrosion-prone parts, which are parts of the indoor heat exchanger that are easily corroded by condensate water. In the scheme of the present application, as shown in Figure 3 The control device of the air conditioner includes an acquisition unit 102 and a control unit 104.

[0089] The control unit 104 is configured to, in a case where the dehumidification mode of the air conditioner is allowed to be started, determine whether a shutdown instruction of the cooling mode of the air conditioner is received during the operation of the cooling mode of the air conditioner, and determine whether there is a user in a room where the air conditioner is located. The specific functions and processes of the control unit 104 are described with reference to step S110. The scheme of the present application also uses a convenient technology, and the shutdown instruction triggers a reverse heating program at the same time, which does not increase the additional action of the customer, and eliminates the hidden danger that the dehumidification mode of the air conditioner is not started due to human factors. In addition, the infrared human body scanning detection technology is added to start the drying and heating program after determining that there is no one in the room.

[0090] The control unit 104 is further configured to, if it is determined that the shutdown instruction of the cooling mode of the air conditioner is received and it is determined that there is no user in the room where the air conditioner is located, control the cooling mode of the air conditioner to be shut down and the dehumidification mode of the air conditioner to be started. The specific functions and processes of the control unit 104 are also described with reference to step S120.

[0091] The acquisition unit 102 is configured to acquire temperature data of the easily-corroded part of the indoor heat exchanger in the dehumidification mode of the air conditioner. The specific functions and processes of the acquisition unit 102 are described with reference to step S130.

[0092] In some embodiments, the easily-corroded part of the indoor heat exchanger includes at least one of the following: a bottom part of the coil of the indoor heat exchanger (such as the U bottom 1 of the evaporator), and a bend part of the connecting pipe of the coil of the indoor heat exchanger (such as the bend 2 of the evaporator).

[0093] Correspondingly, the temperature data of the easily-corroded part of the indoor heat exchanger includes any one of the following temperature data: the temperature data of the bottom part of the coil of the indoor heat exchanger, the temperature data of the bend part of the connecting pipe of the coil of the indoor heat exchanger, and the average or weighted average of the temperature data of the bottom part of the coil of the indoor heat exchanger and the temperature data of the bend part of the connecting pipe of the coil of the indoor heat exchanger.

[0094] Figure 4 is a structural schematic diagram of the evaporator in the split indoor unit, Figure 5 is a structural schematic diagram of the U bottom 1 of the evaporator, Figure 6 is a structural schematic diagram of the bend 2 of the evaporator. As Figure 4 、 Figure 5 and Figure 6As shown, the split indoor unit of the air conditioner has an evaporator with a U bottom 1 and an elbow 2. The scheme of the present application judges the water amount on the surface of the U bottom 1 and the elbow 2 of the evaporator according to the temperature data of the easily corroded parts of the evaporator such as the U bottom 1 and the elbow 2 after the air conditioner is operated in the cooling mode, and selects the water removal mode of the frequency of the set different compressors and the heating time according to the water amount. By using the scheme of the present application, the evaporator is dried as a whole after the air conditioner is operated in the cooling mode, the strong corrosive liquid film attached to the elbow 2 and the U bottom 1 of the evaporator is removed, and the problem of corrosion of the air conditioner can be effectively solved. By heating the fins of the evaporator, the liquid film on the tube fins is removed, and high-temperature baking can effectively inhibit the growth and reproduction of microorganisms, and the problem of air conditioner disease and peculiar smell can be solved from the source.

[0095] The scheme of the present application uses high-efficiency corrosion prevention technology, independently carries out a large number of tests and combines after-sales statistical data to determine that the U bottom 1 of the evaporator is the weak point of corrosion prevention, and the water film is the key factor affecting the corrosion of the U bottom 1 of the evaporator. Before the heating program is operated, the water film thickness of the U bottom 1 of the evaporator is judged by collecting the temperature data of the U bottom 1 of the evaporator, and the drying program is called to dry and remove water, so as to achieve the effect of precise corrosion prevention.

[0096] In the scheme of the present application, the collection of the base material temperature of the U bottom 1 of the evaporator is specifically described as follows:

[0097] First, the U bottom 1 of the evaporator is the weak point of the air conditioner system, on the one hand, during the production and manufacturing process, the wall thickness of the U bottom 1 of the evaporator is thinned, and the wall thickness of the U bottom 1 of the evaporator is the thinnest in the entire circuit system. In addition, due to the influence of structure, the condensate water in the U bottom 1 of the evaporator is the most difficult to evaporate after the air conditioner is turned off (such as Figure 9 As shown), the corrosion medium SO2, H2S, CO2 and NH3 in the air dissolve in the water film to become strong corrosive medium, the PH value of the liquid film decreases, the acidic environment formed is the electrochemical corrosion of the base material, which leads to rapid corrosion of the U bottom 1 to cold leakage. The present patent focuses on drying the condensate water of the U bottom 1, completely cutting off the electrochemical corrosion circuit of the base material, and the corrosion resistance of the U bottom 1 is at least improved by more than 4 times, such as Figure 10 and Figure 11 As shown. Figure 9 The schematic diagram of the U bottom 1 of the evaporator after the air conditioner is turned off in the cooling mode is shown in Figure 10 The schematic diagram of the simulated corrosion of the U bottom 1 of the evaporator is shown in Figure 1 , Figure 11 The schematic diagram of the simulated corrosion of the U bottom 1 of the evaporator is shown in Figure 2 .

[0098] Secondly, in the related scheme, the temperature test is performed by collecting the coil temperature of the evaporator or the ambient temperature, compared with the scheme of the present application which collects the U bottom 1 base material temperature of the evaporator, there is data lag, the coil point temperature of the evaporator is different, the ambient temperature is different from the temperature of the evaporator, and changes slowly, the scheme of the present application directly collects the U bottom 1 base material temperature of the evaporator, judges the water film forming condition of the condensed water on the evaporator through the U bottom 1 base material temperature of the evaporator, and then calls the frequency of different compressors, so that the working condition of the compressor can be controlled faster and more accurately, so that the water film of the U bottom 1 of the evaporator can be dried in the shortest time and under the condition of the lowest power consumption.

[0099] The control unit 104 is further configured to determine water film thickness data formed on the indoor heat exchanger according to temperature data of the corrosion-prone part of the indoor heat exchanger in the water removal mode of the air conditioner. For specific functions and processes of the control unit 104, please refer to step S140.

[0100] In some embodiments, the control unit 104 determines water film thickness data formed on the indoor heat exchanger according to temperature data of the corrosion-prone part of the indoor heat exchanger in the water removal mode of the air conditioner, including that the control unit 104 is further configured to determine, according to a correspondence between the set temperature data and the set water film thickness data, set water film thickness data corresponding to the set temperature data identical to the temperature data of the corrosion-prone part of the indoor heat exchanger in the correspondence as water film thickness data corresponding to the temperature data of the corrosion-prone part of the indoor heat exchanger, as the water film thickness data formed on the indoor heat exchanger.

[0101] In the use process of the air conditioner, after the air conditioner cools, the evaporator will attach a large amount of liquid film due to condensation. For the exposed copper pipe at both ends of the evaporator, the corrosive medium in the air dissolves in the above-mentioned liquid film, and the liquid film forms a loop with the base material to constitute electrochemical corrosion, which accelerates the corrosion of the easily corroded parts of the evaporator, such as the U bottom 1 and the elbow 2. The above-mentioned process is a key process that determines the service life of the air conditioner. In addition, for the pipe fin part of the evaporator, a large amount of condensed water is easy to breed bacteria and fungi. If a person inhales the above-mentioned microorganisms for a long time in a closed space, a series of respiratory diseases will be caused, which are light dizziness and headache, and heavy bacterial infection. Therefore, according to the scheme of the present application, after the air conditioner cools and shuts down, the heating mode is switched, the frequency of the compressor is controlled according to the pipe temperature of the evaporator, and the running time of the heating mode is controlled according to the pipe temperature of the evaporator. The pipe temperature of the evaporator is the temperature of the U bottom 1 and the elbow 2. The running time of the heating mode is determined according to the pipe temperature of the evaporator. Before the heating program runs, the scheme of the present application clearly checks the position of the U bottom 1 of the evaporator. Because a large number of experiments are independently carried out and combined with after-sales statistical data, it is determined that the U bottom 1 of the evaporator is the weak point of corrosion prevention, and the water film is the key factor affecting the corrosion of the U bottom 1 when the water film is affected. Therefore, the main research object of the scheme of the present application is the water film when the U bottom 1 is affected. By collecting the temperature data of the U bottom 1 of the evaporator, the water film thickness of the U bottom 1 of the evaporator is judged, and the drying program is called to dry and remove water.

[0102] The control unit 104 is also configured to determine the operation parameter of the compressor according to the water film thickness data formed on the indoor heat exchanger in the water removal mode of the air conditioner. For specific functions and processing of the control unit 104, see step S150.

[0103] In some embodiments, the operation parameter of the compressor includes at least one of the following: the operation frequency of the compressor, and the operation frequency of the compressor.

[0104] The control unit 104 determines the operation parameter of the compressor according to the water film thickness data formed on the indoor heat exchanger in the water removal mode of the air conditioner, including: the control unit 104 is specifically configured to determine the set operation parameter corresponding to the water film thickness data formed on the indoor heat exchanger in the water removal mode of the air conditioner according to the corresponding relationship between the set water film thickness data and the set operation parameter, and determine the set operation parameter corresponding to the water film thickness data formed on the indoor heat exchanger in the water removal mode of the air conditioner as the operation parameter corresponding to the water film thickness data formed on the indoor heat exchanger in the water removal mode of the air conditioner.

[0105] Figure 7 It is a schematic diagram of the elbow 2 of the evaporator in the cooling and heating conditions. The water film condensed on the elbow 2 of the evaporator after the air conditioner cools, and the indoor fan blade is closed. Under the premise of not affecting the indoor temperature rise, the water film can be completely dried by heating for about 3 minutes, as shown in Figure 7 .

[0106] Figure 8 The schematic diagram of the condensation state of the elbow 2 of the evaporator. In the refrigeration process of the air conditioner, a large amount of water film will condense on the surface of the U end (i.e. U bottom 1) of the evaporator and the small elbow 2, and the corrosion medium SO2, H2S, CO2 and H3N in the air can all be dissolved in the water film to become strong corrosion medium, accelerating the corrosion of the base material. After the air conditioner is turned off in the refrigeration mode, the condensation state of the elbow 2 of the evaporator is as shown in Figure 8

[0107] After the air conditioner is turned off in the refrigeration mode, the automatic water removal mode of the air conditioner is started, i.e. the heating mode is automatically started, the temperature data of the U bottom 1 and the elbow 2 of the evaporator are obtained by the temperature probe, the built-in logic program judges the water amount on the surface of the U bottom 1 and the elbow 2 of the evaporator according to the temperature data, and the water removal mode of the air conditioner is selected according to the water amount, i.e. the frequency of the compressor and the heating time of the different compressor are set according to the water amount. After the mode is selected, the four-way valve of the air conditioner is reversed in the heating mode, the high-temperature and high-pressure refrigerant vapor discharged by the compressor flows to the indoor heat exchanger through the four-way valve, the indoor fan is stopped, and the cross-flow fan blade of the indoor fan stops working to prevent the heat from being blown into the room and affecting the room temperature rise rate. At the same time, the heat of the concentrated high-temperature refrigerant is transferred to the liquid film attached to the surface of the evaporator through the refrigerant pipeline and the fins of the evaporator, the high-pressure refrigerant liquid cooled by the indoor side heat release flows through the capillary throttling, and the throttled low-temperature and low-pressure liquid refrigerant flows into the outdoor heat exchanger to evaporate and absorb the heat in the outdoor air. The low-temperature and low-pressure refrigerant vapor evaporated from the outdoor heat exchanger is sucked into the compressor for compression. Such a cycle is repeated, the liquid film on the evaporator continuously absorbs heat under high-temperature conditions, evaporates quickly, and the electrochemical corrosion loop formed by the liquid film on the evaporator and the base material is quickly disconnected, thereby achieving the purpose of preventing the corrosion of the evaporator. In addition, the dry evaporator fins have no environment for the growth of fungi and bacteria, and the high temperature on the pipeline and the fins of the evaporator can effectively kill bacteria and fungi, thereby fundamentally solving the air conditioner disease and odor problem.

[0108] The control unit 104 is further configured to control the four-way valve to reverse in the water removal mode of the air conditioner to make the air conditioner execute the heating mode of the air conditioner, control the indoor fan to stop, and control the compressor to operate according to the determined operating parameters of the compressor to at least dry the easily corroded parts of the indoor heat exchanger until the heating mode of the air conditioner is exited. The specific functions and processes of the control unit 104 also refer to step S160.

[0109] ​The scheme of the present application is to remove condensed water after refrigeration of the air conditioner is finished, to prevent corrosion and inhibit bacteria according to temperature data of the evaporator, and to inhibit growth and reproduction of bacteria and microorganisms in a humid environment by drying and removing water through heating.

[0110] In some embodiments, the control unit 104 controls the four-way valve to reverse direction to make the air conditioner execute the heating mode of the air conditioner, controls the indoor fan to stop, and controls the compressor to operate according to the determined operating parameters of the compressor in the water removal mode of the air conditioner.

[0111] The control unit 104 is specifically further configured to control the four-way valve to reverse direction to start the heating mode of the air conditioner, control the indoor fan to stop, and control the compressor to operate according to the determined operating parameters of the compressor in the water removal mode of the air conditioner. The specific functions and processes of the control unit 104 are also described in step S210.

[0112] The control unit 104 is specifically further configured to determine whether the water film thickness data formed on the indoor heat exchanger has been reduced to below the set water film thickness data threshold after the first set time. The specific functions and processes of the control unit 104 are also described in step S220.

[0113] The control unit 104 is specifically further configured to control the compressor to stop and exit the heating mode of the air conditioner if it is determined that the water film thickness data formed on the indoor heat exchanger has been reduced to below the set water film thickness data threshold. The specific functions and processes of the control unit 104 are also described in step S230.

[0114] The control unit 104 is specifically further configured to determine new operating parameters of the compressor according to the water film thickness data formed on the indoor heat exchanger and control the compressor to operate according to the determined new operating parameters of the compressor if it is determined that the water film thickness data formed on the indoor heat exchanger has not been reduced to below the set water film thickness data threshold. The specific functions and processes of the control unit 104 are also described in step S240.

[0115] The scheme of the application also adopts an energy-saving water removal technology, in the heating program operation, the temperature data of the U bottom 1 of the evaporator is collected in real time, which is indirectly converted into the water film thickness data of the U bottom 1 of the evaporator, according to the water film thickness change of the U bottom 1 of the evaporator, the drying program is called in real time, the advantages are high efficiency, energy saving and noise reduction; and in the drying process, the tubular fan blade of the indoor fan is closed, on the one hand, it can avoid blowing away the refrigerant heat, and can concentrate the power of the compressor for water removal, on the other hand, it can avoid greatly reducing the heat leakage of the heat exchanger to affect the room temperature rise rate.

[0116] In some embodiments, at least one of the following auxiliary control situations is further included, namely at least one of the following auxiliary control situations: the first auxiliary control situation and the second auxiliary control situation.

[0117] The first auxiliary control situation: the control unit 104 is also configured to control the indoor fan to be turned on and reversed for a second set time after exiting the heating mode of the air conditioner, so as to further reduce the air humidity at the indoor heat exchanger, and to perform self-cleaning on the filter screen at the air inlet of the indoor unit.

[0118] Preferably, the coil surface of the indoor heat exchanger is coated with a corrosion-resistant coating; the water removal and corrosion prevention mode in the scheme of the application is compatible with the coating corrosion prevention in the related scheme, and the two can jointly implement a corrosion prevention effect of 1+1>2, achieving efficient and long-lasting corrosion prevention.

[0119] The scheme of the application also adopts a self-cleaning technology, after the heating program operation is completed, the tubular fan blade of the indoor fan is turned on and reversed, which has the advantages of: on the one hand, further reducing the gas humidity in the heat exchanger body shell, on the other hand, reversing the air inlet filter screen to reduce the filter screen blockage rate, ensuring sufficient air intake during normal operation and good refrigeration and heating effect.

[0120] In the scheme of the application, the difference in the motor state of the tubular fan blade of the indoor fan is as follows: in the related scheme, the motor of the tubular fan blade of the indoor fan is turned on, the air deflector is closed or upward, avoiding blowing people, and compared with the scheme of the application, the difference is as follows:

[0121] First, in the scheme of the application, the motor of the tubular fan blade of the indoor fan is in the closed state during the heating and water removal process, which has two advantages: on the one hand, the motor of the indoor fan is closed, reducing the heat exchange between the evaporator and the air, concentrating the refrigerant heat for water removal, and being more efficient; on the other hand, the heat of the evaporator will not spread to the indoor, causing a large temperature rise in the indoor, affecting the body sensation; under the use condition of the scheme of the application, the temperature difference between the normal shutdown room temperature and the shutdown room temperature after 5 minutes of heating is less than 0.1℃, the short-time heating has little effect on the overall room temperature, and the specific data is shown in the examples of Table 1 and Table 2. Figure 13Table 1 is a table of temperatures of each test point near the indoor unit in the room for normal shutdown, Figure 14 Table 2 is a table of temperatures of each test point near the indoor unit in the room for shutdown after heating for 5 minutes.

[0122] Secondly, in the scheme of the present application, after the water removal is completed, the fan of the cross-flow fan blade of the indoor fan is turned on and reversed, the air inlet of the indoor unit becomes an air outlet, there is a strong corrosive medium environment, and there is generally more dust, which deposits on the mesh cover of the air inlet and accumulates for a long time, causing the mesh cover to be dirty and blocked, affecting the air inlet amount of the evaporator under normal start-up conditions, and ultimately affecting the refrigeration effect of the unit; after the water removal is completed, the air inlet of the indoor unit becomes an air outlet, blowing off the dust deposited on the filter screen, achieving the effect of self-cleaning of the filter screen, and ensuring the normal refrigeration effect of the unit.

[0123] Figure 12 The control logic of the air conditioner is shown in the schematic diagram. After the water film on the evaporator is completely dried for 180s in the heating mode, the unit automatically stops, and the operation logic diagram is as shown in Figure 12 As shown in Figure 12 , after the air conditioner receives a shutdown command in the refrigeration mode, if the old program is used, the evaporator is still in a humid state under normal shutdown; if the new program is used, the temperature of the U bottom 1 and the elbow 2 of the evaporator is detected, the water amount on the surface of the evaporator is determined according to the temperature detection data of the U bottom 1 and the elbow 2 of the evaporator, the corresponding water removal mode is selected and the heating curve is determined, so as to dry the evaporator, and then normally shut down. Under the old program, the service life of the evaporator is affected by electrochemical corrosion, bacteria, and fungus breeding, and problems such as air conditioner disease and odor are caused, but these problems do not occur under the new program. That is, air conditioner corrosion is a key factor affecting the service life of the air conditioner, and the scheme of the present application greatly improves the service life of the air conditioner without additional material cost, and effectively inhibits the growth and reproduction of microorganisms, and eradicates the air conditioner disease and odor problem from the source.

[0124] The scheme of the present application effectively solves the air conditioner corrosion problem without additional material cost and without reducing production efficiency, and solves the problems of bacteria and fungus breeding, which can greatly improve the service life and use experience of the air conditioner.

[0125] In the related scheme, the anti-corrosion process generates a physical barrier through the anti-corrosion coating, cuts off the contact between the base material and the environmental corrosive medium, and forms a high-resistance film to block the penetration channel of oxygen, water and corrosive anion and cation medium. The anti-corrosion coating is generally an epoxy or acrylic system. In long-term immersion in an aqueous solution containing sulfur elements, halogen ammonium ions, the coating itself will dissolve. At the same time, due to the complex structure of the heat exchanger, the use of coating anti-corrosion has problems such as low efficiency, uneven coating, and cannot fundamentally solve the corrosion problem of the heat exchanger. The scheme of the present application is not limited by the structure of the heat exchanger and the type of environmental corrosive medium, does not affect the production efficiency during production, does not generate additional costs during design, and has good anti-corrosion effect.

[0126] The second auxiliary control case: the control unit 104 is also configured to start the sterilization mode of the air conditioner to perform self-cleaning on the indoor unit after the heating mode of the air conditioner is exited in the case that the air conditioner has a preset sterilization mode of the air conditioner.

[0127] In the scheme of the present application, the air conditioner also has an antibacterial and bacteriostatic mode, which can dry the water film on the surface of the fin of the pipeline and the heat exchanger, eliminate the growth environment of bacteria and fungi, and effectively inhibit the growth of bacteria and fungi.

[0128] In the related scheme, the air conditioner sterilization and disinfection method is to spray disinfectant, which is harmful to human health and has poor persistence. With the operation of the air conditioner for refrigeration, the continuously generated condensate continuously washes the disinfectant attached to the fins and pipelines of the heat exchanger, causing the loss of the disinfectant and the loss of long-term sterilization and antibacterial function. Fungus and bacteria grow repeatedly, and the air conditioner disease and odor problem cannot be fundamentally solved. The present application can effectively solve the air conditioner disease and odor problem without affecting the normal use of the air conditioner.

[0129] Since the processing and functions realized by the device of the present embodiment basically correspond to the embodiments, principles and examples of the foregoing method, details not described in the description of the present embodiment can be referred to the related description in the foregoing embodiments, which will not be repeated here.

[0130] According to the embodiments of the present application, an air conditioner corresponding to the control device of the air conditioner is also provided. The air conditioner can include the control device of the air conditioner described above.

[0131] Since the processing and functions realized by the air conditioner of the present embodiment basically correspond to the embodiments, principles and examples of the foregoing device, details not described in the description of the present embodiment can be referred to the related description in the foregoing embodiments, which will not be repeated here.

[0132] According to the embodiments of the present application, a computer program product corresponding to the air conditioner is also provided, which includes a computer program that realizes the steps of the control method of the air conditioner described above when executed by a processor.

[0133] Since the processing and functions realized by the product of the embodiment are basically corresponding to the foregoing embodiments, principles and examples of the air conditioner, the unexplained parts in the description of the embodiment can be seen in the foregoing embodiments, and will not be described here.

[0134] According to the embodiment of the present application, a storage medium corresponding to the control method of the air conditioner is also provided, which comprises a stored program, wherein when the program is running, the device where the storage medium is located executes the steps of the control method of the air conditioner.

[0135] Since the processing and functions realized by the storage medium of the embodiment are basically corresponding to the foregoing embodiments, principles and examples of the method, the unexplained parts in the description of the embodiment can be seen in the foregoing embodiments, and will not be described here.

[0136] In summary, the person skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0137] The above only describes the embodiments of the present application and is not used to limit the present application. The present application can have various modifications and changes for the person skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the scope of claims of the present application.

Claims

1. A control method of an air conditioner, characterized by, The air conditioner has an indoor unit and an outdoor unit, the indoor unit has an indoor heat exchanger and an indoor fan, and the outdoor unit has a compressor and a four-way valve; The air conditioner has a water removal mode, which can at least dry the corrosion-prone part of the indoor heat exchanger; The control method of the air conditioner comprises: In the case of allowing to start the water removal mode of the air conditioner, during the operation of the cooling mode of the air conditioner, it is determined whether the closing instruction of the cooling mode of the air conditioner is received, and it is determined whether there is a user in the room where the air conditioner is located; If it is determined that the closing instruction of the cooling mode of the air conditioner is received, and it is determined that there is no user in the room where the air conditioner is located, the cooling mode of the air conditioner is controlled to be closed, and the water removal mode of the air conditioner is started; In the water removal mode of the air conditioner, the temperature data of the corrosion-prone part of the indoor heat exchanger is obtained; According to the temperature data of the corrosion-prone part of the indoor heat exchanger, the water film thickness data formed on the indoor heat exchanger is determined; According to the water film thickness data formed on the indoor heat exchanger, the operation parameter of the compressor is determined; The four-way valve is controlled to reverse to make the air conditioner execute the heating mode of the air conditioner, the indoor fan is controlled to stop, the compressor is controlled to operate according to the determined operation parameter of the compressor, so as to at least dry the corrosion-prone part of the indoor heat exchanger, until the heating mode of the air conditioner is exited.

2. The control method of the air conditioner according to claim 1, characterized by, The corrosion-prone part of the indoor heat exchanger includes at least one of the bottom part of the coil of the indoor heat exchanger and the elbow part of the connecting pipe of the coil of the indoor heat exchanger; The temperature data of the corrosion-prone part of the indoor heat exchanger includes any one of the temperature data of the bottom part of the coil of the indoor heat exchanger, the temperature data of the elbow part of the connecting pipe of the coil of the indoor heat exchanger, and the average or weighted average of the temperature data of the bottom part of the coil of the indoor heat exchanger and the temperature data of the elbow part of the connecting pipe of the coil of the indoor heat exchanger.

3. The control method of the air conditioner according to claim 1 or 2, characterized by, According to the temperature data of the corrosion-prone part of the indoor heat exchanger, the water film thickness data formed on the indoor heat exchanger is determined, which comprises: According to the corresponding relationship between the set temperature data and the set water film thickness data, the set water film thickness data corresponding to the set temperature data which is the same as the temperature data of the corrosion-prone part of the indoor heat exchanger in the corresponding relationship is determined as the water film thickness data corresponding to the temperature data of the corrosion-prone part of the indoor heat exchanger, as the water film thickness data formed on the indoor heat exchanger.

4. The control method of the air conditioner according to any one of claims 1 to 3, characterized by, The operation parameter of the compressor includes at least one of the operation frequency of the compressor and the operation frequency of the compressor. According to the water film thickness data formed on the indoor heat exchanger, the operation parameter of the compressor is determined, which comprises: According to the corresponding relationship between the set water film thickness data and the set operation parameter, the set operation parameter corresponding to the set water film thickness data which is the same as the water film thickness data formed on the indoor heat exchanger in the corresponding relationship is determined as the operation parameter corresponding to the water film thickness data formed on the indoor heat exchanger, as the operation parameter of the compressor.

5. The control method of an air conditioner according to any one of claims 1 to 4, characterized by, controlling the four-way valve to reverse to make the air conditioner execute a heating mode of the air conditioner, controlling the indoor fan to stop, and controlling the compressor to operate according to the determined operating parameter of the compressor, including: controlling the four-way valve to reverse to start the heating mode of the air conditioner, and after the heating mode of the air conditioner is started, controlling the indoor fan to stop and controlling the compressor to operate according to the determined operating parameter of the compressor; after the first set time, determining whether the water film thickness data formed on the indoor heat exchanger has been reduced to below a set water film thickness data threshold value; if it is determined that the water film thickness data formed on the indoor heat exchanger has been reduced to below the set water film thickness data threshold value, controlling the compressor to stop and exiting the heating mode of the air conditioner; if it is determined that the water film thickness data formed on the indoor heat exchanger has not been reduced to below the set water film thickness data threshold value, determining a new operating parameter of the compressor according to the water film thickness data formed on the indoor heat exchanger again, and controlling the compressor to operate according to the determined new operating parameter of the compressor, and the cycle is repeated.

6. The control method of the air conditioner according to any one of claims 1 to 5, characterized by, Further comprising: after exiting the heating mode of the air conditioner, controlling the indoor fan to start and reverse for a second set time to further reduce the air humidity at the indoor heat exchanger and to perform self-cleaning on the filter screen at the air inlet of the indoor unit; wherein the surface of the coil of the indoor heat exchanger is coated with a corrosion-resistant coating.

7. A control device of an air conditioner, characterized by comprising: The air conditioner has an indoor unit and an outdoor unit, the indoor unit has an indoor heat exchanger and an indoor fan, and the outdoor unit has a compressor and a four-way valve; The air conditioner has a water removal mode and can at least dry the corrosion-prone parts of the indoor heat exchanger; The control device of the air conditioner comprises: The control unit is configured to, in the case of allowing the water removal mode of the air conditioner to be started, determine whether a closing instruction of the cooling mode of the air conditioner is received and determine whether there is a user in the room where the air conditioner is located during the operation of the cooling mode of the air conditioner. The control unit is further configured to, if it is determined that the closing instruction of the cooling mode of the air conditioner is received and it is determined that there is no user in the room where the air conditioner is located, control the cooling mode of the air conditioner to be closed and control the water removal mode of the air conditioner to be started. The acquisition unit is configured to acquire temperature data of the corrosion-prone parts of the indoor heat exchanger in the water removal mode of the air conditioner. The control unit is further configured to determine water film thickness data formed on the indoor heat exchanger according to the temperature data of the corrosion-prone parts of the indoor heat exchanger. The control unit is further configured to determine an operating parameter of the compressor according to the water film thickness data formed on the indoor heat exchanger. The control unit is further configured to control the four-way valve to reverse to make the air conditioner execute a heating mode of the air conditioner, control the indoor fan to stop, and control the compressor to operate according to the determined operating parameter of the compressor to at least dry the corrosion-prone parts of the indoor heat exchanger until the heating mode of the air conditioner is exited.

8. An air conditioner characterized by comprising: Comprise: The control device of the air conditioner according to claim 7.

9. A storage medium, characterized by The storage medium includes a stored program, wherein the program, when executed, controls a device in which the storage medium is located to perform the control method of the air conditioner according to any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that, The computer program, when executed by a processor, implements the steps of the control method of the air conditioner according to any one of claims 1 to 6.

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