Control method for preventing freezing of air conditioner and air conditioner

Abstract

The present application belongs to the technical field of air conditioners, and specifically provides an air conditioner anti-freezing control method and an air conditioner. The control method comprises the following steps: obtaining the temperature of the evaporator of the air conditioner and recording it as a first current temperature T1; determining whether the first current temperature T1 is less than or equal to a first preset temperature Ts1, so as to determine whether the evaporator is at risk of freezing; if yes, obtaining the temperature at a target position in the room where the air conditioner is located and recording it as a second current temperature T2; determining whether the second current temperature T2 is greater than a second preset temperature Ts2, so as to determine whether the temperature in the room is evenly distributed; if yes, adjusting the position of the horizontal air deflector of the air conditioner and / or the rotating speed of the fan according to a first preset rule, and adjusting the opening degree of the expansion valve of the air conditioner according to a second preset rule, so that the first current temperature T1 is greater than the first preset temperature Ts1. The present application overcomes the problem that the compressor of the air conditioner is frequently stopped and started due to the avoidance of evaporator freezing.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and specifically provides an air conditioner anti-freezing control method and an air conditioner. BACKGROUND

[0002] When the existing air conditioner is running in the cooling mode, dehumidification mode and other modes capable of cooling the air inside, it is easy to cause the temperature of the evaporator surface to be too low due to low inlet air temperature, insufficient air volume, insufficient refrigerant circulation and other factors, resulting in icing, that is, the evaporator is frozen. After the evaporator is frozen, not only the cooling efficiency of the evaporator on the air is affected, but also the air conditioner may blow water and ice.

[0003] In order to overcome the above problems, the existing air conditioner usually reduces the frequency of the compressor or even stops the compressor when running in the cooling mode or dehumidification mode, so as to reduce the cooling power of the evaporator. However, in this way, the air conditioner is frequently stopped and started, the refrigeration temperature fluctuates greatly, and the user experience is affected. SUMMARY

[0004] One object of the present application is to solve the problem of frequent stopping and starting of the compressor of the air conditioner to avoid freezing of the evaporator.

[0005] Another object of the present application is how to use the surrounding environment to reduce the risk of freezing of the evaporator of the air conditioner.

[0006] To achieve the above object, the present application provides an air conditioner anti-freezing control method in the first aspect, comprising:

[0007] obtaining the temperature of the evaporator of the air conditioner, and recording it as a first current temperature T1;

[0008] determining whether the first current temperature T1 is less than or equal to a first preset temperature Ts1, to determine whether the evaporator has a freezing risk;

[0009] If it is less than or equal to, the temperature at a target position in the room where the air conditioner is located is obtained, and recorded as a second current temperature T2;

[0010] determining whether the second current temperature T2 is greater than a second preset temperature Ts2, to determine whether the temperature in the room is evenly distributed;

[0011] If it is greater, the position of the horizontal air deflector of the air conditioner and / or the rotating speed of the fan are adjusted according to a first preset rule, and the opening degree of the expansion valve of the air conditioner is adjusted according to a second preset rule, so that the first current temperature T1 is greater than the first preset temperature Ts1.

[0012] Optionally, the position where the air conditioner is located and the target position are opposite sides of the room.

[0013] Optionally, the target position is multiple.

[0014] The step of obtaining the temperature at the target position in the room where the air conditioner is located and recording it as the second current temperature T2 comprises:

[0015] Obtaining the temperature at each target position in the room where the air conditioner is located.

[0016] Recording the average of all temperatures as the second current temperature T2, or recording the maximum one of all temperatures as the second current temperature T2.

[0017] Optionally, the first preset rule comprises: gradually increasing the blowing position of the horizontal air deflector of the air conditioner until the horizontal air deflector is increased to the highest blowing position or the first current temperature T1 is greater than the first preset temperature Ts1; and / or, gradually increasing the rotating speed of the fan of the air conditioner until the rotating speed of the fan is increased to the maximum rotating speed or the first current temperature T1 is greater than the first preset temperature Ts1.

[0018] The second preset rule comprises: gradually increasing the opening degree of the expansion valve of the air conditioner until the opening degree of the expansion valve is increased to the maximum opening degree or the first current temperature T1 is greater than the first preset temperature Ts1.

[0019] Optionally, the first preset rule further comprises:

[0020] Gradually increasing the blowing position of the horizontal air deflector of the air conditioner;

[0021] After each adjustment for the first preset time t1, the first current temperature T1 is obtained again.

[0022] If the first current temperature T1 is greater than the first preset temperature Ts1, the horizontal air deflector is controlled to keep the current position.

[0023] If the horizontal air deflector is increased to the limit value and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, the rotating speed of the fan of the air conditioner is gradually increased.

[0024] After each adjustment for the second preset time t2, the first current temperature T1 is obtained again.

[0025] If the first current temperature T1 is greater than the first preset temperature Ts1, the fan is controlled to keep the current rotating speed.

[0026] If the first current temperature T1 is less than or equal to the first preset temperature Ts1, continue to step up the rotation speed of the fan of the air conditioner until the rotation speed of the fan is adjusted to a limit value.

[0027] Optionally, the second preset rule further comprises:

[0028] Step up the opening degree of the expansion valve of the air conditioner step by step;

[0029] After each adjustment of the third preset time t3, obtain the first current temperature T1;

[0030] If the first current temperature T1 is greater than the first preset temperature Ts1, control the expansion valve to maintain the current opening degree;

[0031] If the first current temperature T1 is less than or equal to the first preset temperature Ts1, continue to step up the opening degree of the expansion valve of the air conditioner until the opening degree of the expansion valve is adjusted to a limit value.

[0032] Optionally, after the step of adjusting the lateral air deflector and / or the fan of the air conditioner according to the first preset rule and adjusting the opening degree of the expansion valve of the air conditioner according to the second preset rule, the control method further comprises:

[0033] If the position of the lateral air deflector, the rotation speed of the fan and the opening degree of the expansion valve are all adjusted to limit values, and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, control the air conditioner to start the anti-freezing protection mode.

[0034] Optionally, the anti-freezing protection mode comprises: controlling the compressor of the air conditioner to reduce the frequency until it stops.

[0035] And / or,

[0036] After the step of controlling the air conditioner to start the anti-freezing protection mode, the control method further comprises: controlling the air conditioner to issue a prompt information to remind the user to clean the filter screen and / or check the refrigerant amount.

[0037] The present application provides an air conditioner in a second aspect, comprising:

[0038] A first temperature detection device is used to detect the temperature of the evaporator of the air conditioner;

[0039] A second temperature detection device is used to detect the temperature at the target position in any one of the second aspect;

[0040] A controller is in communication connection with the first temperature detection device and the second temperature detection device, respectively;

[0041] The memory stores program instructions configured to enable the air conditioner to execute the control method according to any one of the second aspect when executed by the controller.

[0042] Optionally, the second temperature detection device is configured in a detachable form, so that the second temperature detection device can be detached from the air conditioner; and the second temperature detection device is wirelessly connected to the controller.

[0043] Based on the foregoing description, those skilled in the art can understand that, in the foregoing technical solutions of the present application, whether the evaporator is at risk of freezing is determined by determining whether the first current temperature T1 of the evaporator is less than or equal to the first preset temperature Ts1, so that when the evaporator is at risk of freezing, the temperature at the target position in the room where the air conditioner is located is obtained and recorded as the second current temperature T2. Whether the temperature in the room is uniformly distributed is determined by determining whether the second current temperature T2 is greater than the second preset temperature Ts2. When the temperature in the room is not uniformly distributed, the position of the horizontal air deflector of the air conditioner and / or the rotating speed of the fan are adjusted according to the first preset rule, and the opening degree of the expansion valve of the air conditioner is adjusted according to the second preset rule, so that the first current temperature T1 is greater than the first preset temperature Ts1. As can be seen, when the evaporator is at risk of freezing, the present application no longer directly reduces the frequency of the compressor, thereby overcoming the problem that the compressor is frequently stopped and started to avoid freezing of the evaporator.

[0044] Those skilled in the art can also understand that, due to the existence of a region with a higher temperature in the room, the temperature of the air entering the air conditioner will increase, causing the evaporator to increase in temperature to a certain extent. However, the present application adjusts the opening degree of the expansion valve while also adjusting the position of the horizontal air deflector of the air conditioner and / or the rotating speed of the fan, so that the air conditioner can utilize the surrounding environment to reduce the risk of freezing of the evaporator and reduce the possibility of reducing the operating frequency of the compressor to avoid freezing of the evaporator.

[0045] Further, by making the position of the air conditioner and the target position be opposite sides of the room, the technical means of obtaining the temperature at the target position in the room where the air conditioner is located is used to determine whether the temperature in the room is uniformly distributed, which is more accurate.

[0046] Further, by configuring the second temperature detection device for detecting the temperature at the target position in the room in a detachable form, the user can arrange the second temperature detection device at a suitable position according to the layout of the room, so that the present application can be applied to various types of room layouts.

[0047] Further, by setting a switch and a back adhesive on the back of the second temperature detecting device, the second temperature detecting device can automatically close the switch and be connected with the controller of the air conditioner when it is taken off from the air conditioner or fixed to the wall, and be fixed to any position on the wall by the back adhesive. Thus, the air conditioner of the present application is more intelligent.

[0048] Other benefits of the present application will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the improved purposes, features and advantages of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the present application, some embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that the components or parts indicated by the same reference signs in different drawings are the same or similar; the drawings of the present application are not necessarily drawn to scale with each other.

[0050] In the drawings:

[0051] Figure 1 is a schematic structural diagram of an air conditioner provided by the present application;

[0052] Figure 2 is a schematic cross-sectional view of an indoor unit of an air conditioner provided by the present application;

[0053] Figure 3 is a schematic structural diagram of a refrigerant circulation system of an air conditioner provided by the present application;

[0054] Figure 4 is a schematic block diagram of an air conditioner in some embodiments of the present application;

[0055] Figure 5 is a first axial view of a second temperature detecting device in some embodiments of the present application;

[0056] Figure 6 is a second axial view of a second temperature detecting device in some embodiments of the present application;

[0057] Figure 7 is a main step flow chart of a control method for preventing freezing of an air conditioner in some embodiments of the present application;

[0058] Figure 8 is a schematic diagram of a scene for detecting temperature in a room in some embodiments of the present application;

[0059] Figure 9 is another schematic diagram of a scene for detecting temperature in a room in some embodiments of the present application;

[0060] Figure 10 is a step flow chart of a first preset rule in some embodiments of the present application;

[0061] Figure 11 is a step flow chart of the second preset rule in some embodiments of the present application. DETAILED DESCRIPTION

[0062] It should be understood by those skilled in the art that the embodiments described below are only a part of the embodiments of the present application, not all the embodiments of the present application, and are intended to explain the technical principles of the present application, not to limit the protection scope of the present application. Based on the embodiments provided by the present application, all other embodiments obtained by those skilled in the art without creative labor shall fall within the protection scope of the present application.

[0063] It should be noted that in the description of the present application, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0064] Further, it should be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0065] In addition, it should be noted that in the description of the present application, the terms "cold" and "heat" are two descriptions of the same physical state. That is, the higher the "cold" of a certain target (such as an evaporator, air, condenser, etc.), the lower the "heat" it has, and the lower the "cold" it has, the higher the "heat" it has. A certain target absorbs "cold" while releasing "heat", and releases "cold" while absorbing "heat". A certain target saves "cold" or "heat" to keep the target at the current temperature. "Refrigeration" and "heat absorption" are two descriptions of the same physical phenomenon, that is, a certain target (such as an evaporator) absorbs heat while refrigerating.

[0066] Finally, it should be noted that in the description of this invention, each functional module can be a physical module composed of multiple structures, components, or electronic devices, or a virtual module composed of multiple programs; each functional module can be an independent module or a module divided from a whole module according to its function. Those skilled in the art should understand that, provided the technical solution described in this invention can be implemented, any changes in the configuration, implementation, or positional relationship of the functional modules will not deviate from the technical principles of this invention, and therefore should all fall within the protection scope of this invention.

[0067] like Figure 1 As shown, in this invention, the air conditioner includes an outdoor unit 100 and an indoor unit 200, wherein the indoor unit 200 can be a wall-mounted unit or a floor-standing unit.

[0068] The following reference Figure 2 The structure of the indoor unit 200 of the present invention will be described in detail using a wall-mounted air conditioner as an example.

[0069] like Figure 2 As shown, in this invention, the indoor unit 200 includes a casing 210, an evaporator 220, a fan 230, and a horizontal air guide plate 240. The casing 210 has an air inlet 211 and an air outlet 212. The evaporator 220 is disposed inside the casing 210 and is used to cool the air inside the casing 210. The fan 230 is also disposed inside the casing 210 and is used to drive outside air into the casing 210 through the air inlet 211, flow through the evaporator 220, and then flow out through the air outlet 212. The horizontal air guide plate 240 is disposed at the air outlet 212 and is used to guide the direction of the cold air in the vertical direction.

[0070] In this invention, unless otherwise specified, the fans described below refer to the fans 230 in the indoor unit 200.

[0071] In this invention, the horizontal air guide plate 240 guides air from the lowest air guide position ( Figure 1 The horizontal air guide plate 240 is rotated clockwise to its limit position until it reaches the uppermost air guide position. Figure 1 The horizontal air guide plate 240 can be adjusted step by step by rotating counterclockwise to its limit position. For example, each time the horizontal air guide plate 240 is rotated counterclockwise by a preset angle (e.g., 3°, 5°, 8°, etc.), it is adjusted up one level, and the cold air blown out from the air outlet 212 blows more upward.

[0072] like Figure 3As shown in the figure, in the present application, the refrigerant circulation system of the air conditioner mainly comprises a compressor 110, a condenser 120, an expansion valve 130 and an evaporator 220. Among them, the compressor 110, the condenser 120 and the expansion valve 130 are arranged in the outdoor unit 100, and the evaporator 220 is arranged in the indoor unit 200. Further, the expansion valve 130 is an electronic expansion valve, so that the air conditioner can automatically control the opening degree of the expansion valve 130.

[0073] As shown in the figure, Figure 4 As shown in the figure, in some embodiments of the present application, the air conditioner further comprises a first temperature detection device 310 and a second temperature detection device 320. Among them, the first temperature detection device 310 is used to detect the temperature of the evaporator 220. The second temperature detection device 320 is used to detect the temperature at the target position in the room.

[0074] In some embodiments of the present application, the position of the air conditioner (specifically the indoor unit 200) and the target position are opposite sides of the room. And the target position can be one or more. Among them, each target position can be respectively configured with a second temperature detection device 320.

[0075] Further, the first temperature detection device 310 and / or the second temperature detection device 320 can be any feasible device, such as a temperature sensor.

[0076] In some embodiments of the present application, the second temperature detection device 320 is configured in a detachable form, so that the second temperature detection device 320 can be detached from the air conditioner (specifically the indoor unit 200). The second temperature detection device 320 is wirelessly connected to the controller 400 of the air conditioner.

[0077] As shown in the figure, Figure 5 And Figure 6 As shown in the figure, the back of the second temperature detection device 320 is provided with a switch 321 and a back adhesive 322, and the back adhesive 322 is used to fix the second temperature detection device 320 to the wall. The switch 321 is configured to be closed when the second temperature detection device 320 is taken off the air conditioner (specifically the indoor unit 200) or fixed to the wall, so that the second temperature detection device 320 is turned on and connected to the controller 400.

[0078] Further, the second temperature detection device 320 further comprises a battery and a solar charging panel, the battery is used to provide the second temperature detection device 320 with the power for detecting temperature and sending temperature signal to the air conditioner. The solar charging panel is used to charge the battery, so as to avoid the user frequently changing and charging the battery.

[0079] Back to continue to refer to Figure 4In some embodiments of the present application, the air conditioner further comprises a controller 400 and a memory 500. The controller 400 is in communication connection with the first temperature detection device 310 and the second temperature detection device 320, respectively. The memory 500 stores program instructions 510 which are configured to enable the air conditioner to perform any of the control methods described hereinafter when executed by the controller 400.

[0080] The memory 500 can include a memory and a non-volatile memory, and provide the controller 400 with the program instructions 510 and data. The memory can be a high-speed random access memory (RAM) for example.

[0081] In the present application, the controller 400 is an integrated circuit chip with the ability to process signals. The controller 400 can be a general-purpose processor, such as a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, a microprocessor, and any other conventional processor.

[0082] The control method for preventing the air conditioner from freezing in some embodiments of the present application will be described in detail below with reference to Figures 7 to 11

[0083] As shown in Figure 7 , the control method for preventing the air conditioner from freezing in some embodiments of the present application comprises:

[0084] Step S110, obtaining the temperature of the evaporator 220 of the air conditioner and recording it as the first current temperature T1.

[0085] Specifically, when the air conditioner is running in a cooling mode, a dehumidifying mode or other modes that can cool the air inside, the temperature of the evaporator 220 of the air conditioner is obtained in real time by the first temperature detection device 310, and the obtained temperature is recorded as the first current temperature T1.

[0086] Step S120, determining whether the first current temperature T1 is less than or equal to a first preset temperature Ts1 to determine whether the evaporator 220 is at risk of freezing. ​

[0087] In the present application, if the temperature of the evaporator 220 is less than or equal to the first preset temperature Ts1, it indicates that the evaporator 220 is at risk of freezing. If the evaporator 220 continues to maintain this temperature, freezing will occur. For this reason, the first preset temperature Ts1 can be determined according to multiple experiments, and the critical temperature at which the evaporator 220 freezes is determined as the first preset temperature Ts1. For example, the first preset temperature Ts1 can be -1℃, 0℃, 1℃, etc.

[0088] In the present application, if the temperature of the evaporator 220 is greater than the first preset temperature Ts1, it returns to continue to execute step S110.

[0089] Step S130, if less than or equal to, the temperature at the target position in the room 600 where the air conditioner is located is obtained, and is recorded as the second current temperature T2.

[0090] As shown in the figure, in some embodiments of the present application, the target position is one, and the position where the air conditioner is located and the target position are opposite sides of the room 600. Figure 8 Alternatively, the skilled person can also set the target position to be multiple according to the needs. Then, step S130 further comprises: obtaining the temperature at each target position in the room 600 where the air conditioner is located; recording the average of all temperatures as the second current temperature T2, or recording the largest one of all temperatures as the second current temperature T2.

[0091] As shown in the figure, in some embodiments of the present application, the target position is one, and the position where the air conditioner is located and the target position are opposite sides of the room 600.

[0092] Figure 9 As shown in the figure, in other embodiments of the present application, the skilled person can also replace the second temperature detection device 320 with a temperature pickup sheet 330 according to the needs. The temperature pickup sheet 330 is at least two. Then, an infrared camera is arranged on the indoor unit 200 and electrically connected with the controller 400, and the temperature at the target position in the room 600 where the air conditioner is located is obtained by the following steps:

[0093] Step S131, an infrared image is obtained, and at least two temperature pickup sheets 330 are identified from the infrared image, i.e., all temperature pickup sheets 330 are identified.

[0094] Step S132, the temperature pickup sheet 330 with the highest temperature is determined, and the corresponding temperature is determined as the second current temperature T2.

[0095] In Figure 9 the embodiments shown in the figure, the temperature pickup sheet 330 can be any thin sheet with good heat conduction performance, such as iron sheet, copper sheet, aluminum sheet, etc. In addition, the surface of the temperature pickup sheet 330 can also be coated with various colors to match the color of the wall.

[0096] ​The skilled in the art can understand that, by replacing the second temperature detecting device 320 with the temperature pickup sheet 330, the temperature pickup sheet 330 can be integrated with the wall, and the appearance is more beautiful.

[0097] In step S140, it is determined whether the second current temperature T2 is greater than the second preset temperature Ts2, so as to determine whether the temperature in the room 600 is uniformly distributed.

[0098] The second preset temperature Ts2 is a set temperature set by a user to the air conditioner. For example, the user sends a temperature setting instruction to the air conditioner through a remote controller, and adjusts the set temperature to 24℃, and the second preset temperature Ts2 is 24℃.

[0099] The skilled in the art can understand that, when the air conditioner performs cooling or dehumidification on the room 600, due to the arrangement position of the indoor unit 200, the cold air is heavier than the hot air, and other factors, the air conditioner often cannot uniformly cool the room 600, so that the temperature in the room 600 is not uniform. Even, there is a dead angle of air flow in the room 600, the air in the dead angle does not participate in the air circulation formed when the air conditioner cools, so that the temperature in the dead angle is higher. And the present application can automatically determine whether the temperature in the room 600 is uniformly distributed by comparing the second current temperature T2 and the second preset temperature Ts2.

[0100] Specifically, when the second current temperature T2 is greater than the second preset temperature Ts2, it indicates that the temperature in the room 600 is not uniformly distributed. When the second current temperature T2 is less than or equal to the second preset temperature Ts2, it indicates that the temperature in the room 600 is uniformly distributed.

[0101] In the present application, the target position includes a dead angle position which does not participate in the air circulation.

[0102] Corresponding to the embodiment shown in Figure 9 In step S140, it is determined whether the second current temperature T2 is greater than the second preset temperature Ts2, so as to determine whether the temperature in the room 600 is uniformly distributed.

[0103] In step S141, the temperature pickup sheet 330 with the lowest temperature is determined, and the temperature corresponding thereto is recorded as a third current temperature T3.

[0104] In step S142, it is determined whether the difference between the second current temperature T2 and the third current temperature T3 is greater than the second preset temperature Ts2.

[0105] In step S142, the second preset temperature Ts2 is different from the set temperature described above, which is a value representing the uniformity of the temperature in the room 600. Specifically, the second preset temperature Ts2 can be 1℃, 2℃, 2.5℃, 3℃, etc.

[0106] If yes, the position of the horizontal air deflector 240 and / or the rotating speed of the air fan 230 of the air conditioner is adjusted according to a first preset rule, and the opening degree of the expansion valve 130 of the air conditioner is adjusted according to a second preset rule, so that the first current temperature T1 is greater than the first preset temperature Ts1.

[0107] The first preset rule comprises: gradually increasing the blowing position of the horizontal air deflector 240 of the air conditioner until the horizontal air deflector 240 is increased to the highest blowing position or the first current temperature T1 is greater than the first preset temperature Ts1; and / or, gradually increasing the rotating speed of the air fan 230 of the air conditioner until the rotating speed of the air fan 230 is increased to the maximum rotating speed or the first current temperature T1 is greater than the first preset temperature Ts1.

[0108] The second preset rule comprises: gradually increasing the opening degree of the expansion valve 130 of the air conditioner until the opening degree of the expansion valve 130 is increased to the maximum opening degree or the first current temperature T1 is greater than the first preset temperature Ts1.

[0109] As shown in FIG. 1, Figure 10 The first preset rule further comprises:

[0110] Step S1511, gradually increasing the blowing position of the horizontal air deflector 240 of the air conditioner.

[0111] Specifically, the blowing position of the horizontal air deflector 240 of the air conditioner is gradually increased by a preset angle.

[0112] The preset angle can be any feasible angle such as 3°, 5°, 8°, etc.

[0113] Step S1512, after each adjustment for a first preset time t1, the first current temperature T1 is acquired again.

[0114] The first preset time t1 can be any feasible time such as 30S, 1min, 90S, etc.

[0115] Step S1513, if the first current temperature T1 is greater than the first preset temperature Ts1, it indicates that the evaporator 220 no longer has the risk of freezing, and the horizontal air deflector 240 is controlled to keep the current position.

[0116] Step S1514, if the horizontal air deflector 240 is increased to the limit value and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, the rotating speed of the air fan 230 of the air conditioner is gradually increased.

[0117] The step of gradually increasing the rotating speed of the air fan 230 of the air conditioner comprises: increasing a preset rotating speed each time, so as to increase the rotating speed of the air fan 230 by one level. The preset rotating speed is 50 r / min, 80 r / min, 150 r / min, 300 r / min, or any other feasible rotating speed.

[0118] In step S1515, the first current temperature T1 is obtained again after the second preset time t2 is adjusted each time.

[0119] The second preset time t2 can be the same as or different from the first preset time t1.

[0120] In step S1516, if the first current temperature T1 is greater than the first preset temperature Ts1, the current rotating speed of the air fan 230 is maintained.

[0121] In step S1517, if the first current temperature T1 is less than or equal to the first preset temperature Ts1, the rotating speed of the air fan 230 is continuously increased by one level until the rotating speed of the air fan 230 is increased to the limit value (i.e., the maximum rotating speed).

[0122] In other embodiments of the present application, the first preset rule can also comprise, according to the needs of those skilled in the art, directly increasing the lateral air deflector 240 to the limit value (i.e., the uppermost blowing position) and / or directly increasing the rotating speed of the air fan 230 to the limit value (i.e., the maximum rotating speed).

[0123] As shown in FIG. 1, Figure 11 the second preset rule further comprises:

[0124] In step S1521, the opening degree of the expansion valve 130 of the air conditioner is gradually increased.

[0125] Specifically, the opening degree of the expansion valve 130 is increased by 5%, 10%, 15%, 20%, or any other feasible value each time the opening degree of the expansion valve 130 is increased by one level.

[0126] In step S1522, the first current temperature T1 is obtained after the third preset time t3 is adjusted each time.

[0127] The third preset time t3 can be 30 seconds, 60 seconds, 90 seconds, 2 minutes, or any other feasible time.

[0128] In step S1523, if the first current temperature T1 is greater than the first preset temperature Ts1, the current opening degree of the expansion valve 130 is maintained.

[0129] In step S1524, if the first current temperature T1 is less than or equal to the first preset temperature Ts1, the opening degree of the expansion valve 130 of the air conditioner is continuously increased by one level until the opening degree of the expansion valve 130 is increased to the limit value.

[0130] Based on the foregoing description, those skilled in the art can understand that, when the evaporator 220 has a freezing risk, instead of directly reducing the frequency of the compressor 110, the opening degree of the expansion valve 130 is adjusted, and the position of the horizontal air deflector 240 and / or the rotating speed of the fan 230 are adjusted, so that the air conditioner can reduce the risk of freezing of the evaporator 220 by using the surrounding environment, and overcome the problem that the compressor 110 is frequently started and stopped to avoid freezing of the evaporator 220.

[0131] Further, although not shown in the figure, in other embodiments of the present application, the air conditioner anti-freezing control method further includes a step after step S150: if the position of the horizontal air deflector 240, the rotating speed of the fan 230 and the opening degree of the expansion valve 130 are all adjusted to the limit value, and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, the air conditioner is controlled to start the anti-freezing protection mode.

[0132] Further, when the second current temperature T2 is less than or equal to the second preset temperature Ts2, the air conditioner anti-freezing control method further includes: controlling the air conditioner to start the anti-freezing protection mode.

[0133] The anti-freezing protection mode includes: controlling the compressor 110 of the air conditioner to reduce the frequency until it is stopped.

[0134] Specifically, after the compressor 110 reduces the frequency each time, the first current temperature T1 is obtained again after a period of time (for example, 30S, 1min, 90S, etc. Any feasible length of time). If the first current temperature T1 is greater than the first preset temperature Ts1, it indicates that the evaporator 220 does not have a freezing risk, and the compressor 110 is controlled to maintain the current frequency. If the first current temperature T1 is still less than or equal to the first preset temperature Ts1, the compressor 110 is controlled to continue to reduce the frequency until it is stopped.

[0135] In other embodiments of the present application, after the step of controlling the air conditioner to start the anti-freezing protection mode, the control method further includes: controlling the air conditioner to issue a reminder information to remind the user to clean the filter screen and / or check the refrigerant amount.

[0136] Further, in other embodiments of the present application, in order to prevent the air conditioner from incorrectly reminding the user to clean the filter screen and / or check the refrigerant amount when it is normal, the air conditioner anti-freezing control method further includes: when the compressor 110 is detected to reduce the frequency until it is stopped M times within a preset period of time, controlling the air conditioner to issue a reminder information to remind the user to clean the filter screen and / or check the refrigerant amount. Wherein M is a natural number not less than 2.

[0137] So far, the technical solutions of the present application have been described in combination with the foregoing embodiments, but those skilled in the art can easily understand that the protection scope of the present application is not limited to these specific embodiments. Those skilled in the art can split and combine the technical solutions in the above-mentioned embodiments, or make equivalent changes or replacements to the related technical features, without departing from the technical principles of the present application. Any changes, equivalent replacements, improvements, etc. made within the technical concept and / or technical principles of the present application will fall within the protection scope of the present application.

Claims

1. A method for controlling air conditioner antifreeze, comprising: Obtain the temperature of the evaporator of the air conditioner and record it as the first current temperature T1; Determine whether the first current temperature T1 is less than or equal to the first preset temperature Ts1, in order to determine whether the evaporator is at risk of freezing. If it is less than or equal to, obtain the temperature at the target location in the room where the air conditioner is located, and record it as the second current temperature T2; Determine whether the second current temperature T2 is greater than the second preset temperature Ts2, in order to determine whether the temperature distribution in the room is uniform. If it is greater than the first preset temperature Ts1, adjust the position of the horizontal air guide plate and / or the speed of the fan of the air conditioner according to the first preset rule, and adjust the opening of the expansion valve of the air conditioner according to the second preset rule, so that the first current temperature T1 is greater than the first preset temperature Ts1. in, The first preset rule includes: gradually increasing the air blowing position of the horizontal air guide plate of the air conditioner until the horizontal air guide plate is raised to the highest air blowing position or the first current temperature T1 is greater than the first preset temperature Ts1; and / or gradually increasing the speed of the air conditioner fan until the speed of the fan is raised to the maximum speed or the first current temperature T1 is greater than the first preset temperature Ts1. The second preset rule includes: gradually increasing the opening degree of the air conditioner's expansion valve until the opening degree of the expansion valve is increased to the maximum opening degree or the first current temperature T1 is greater than the first preset temperature Ts1.

2. The control method according to claim 1, wherein, The location of the air conditioner and the target location are on opposite sides of the room.

3. The control method according to claim 1, wherein, There are multiple target locations; The step of obtaining the temperature at the target location in the room where the air conditioner is located and recording it as the second current temperature T2 includes: Obtain the temperature at each of the target locations within the room where the air conditioner is located; The average of all temperatures is denoted as the second current temperature T2, or the largest of all temperatures is denoted as the second current temperature T2.

4. The control method according to claim 1, wherein, The first preset rule further includes: The airflow position of the horizontal air guide plate of the air conditioner is gradually increased; After each adjustment of the first preset duration t1, the first current temperature T1 is obtained again; If the first current temperature T1 is greater than the first preset temperature Ts1, control the horizontal air guide plate to maintain its current position; If the horizontal air guide plate is adjusted to the limit value, and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, the speed of the air conditioner fan is gradually increased. After each adjustment of the second preset duration t2, the first current temperature T1 is obtained again; If the first current temperature T1 is greater than the first preset temperature Ts1, control the fan to maintain the current speed; If the first current temperature T1 is less than or equal to the first preset temperature Ts1, the speed of the air conditioner fan will continue to be increased step by step until the speed of the fan is increased to the limit value.

5. The control method according to claim 1, wherein, The second preset rule further includes: Gradually increase the opening of the air conditioner's expansion valve; After each adjustment of the third preset duration t3, the first current temperature T1 is obtained; If the first current temperature T1 is greater than the first preset temperature Ts1, control the expansion valve to maintain the current opening degree; If the first current temperature T1 is less than or equal to the first preset temperature Ts1, the opening of the air conditioner's expansion valve is gradually increased until the opening of the expansion valve reaches its limit value.

6. The control method according to any one of claims 1 to 5, after the steps of adjusting the horizontal air guide plate and / or fan of the air conditioner according to a first preset rule and adjusting the opening of the expansion valve of the air conditioner according to a second preset rule, the control method further includes: If the position of the horizontal air guide plate, the speed of the fan, and the opening of the expansion valve are all adjusted to their limit values, and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, the air conditioner is controlled to activate the anti-freeze protection mode.

7. The control method according to claim 6, wherein, The anti-freeze protection mode includes: controlling the air conditioner's compressor to reduce its frequency until it stops; And / or, After the step of controlling the air conditioner to activate the anti-freeze protection mode, the control method further includes: controlling the air conditioner to issue a reminder message to remind the user to clean the filter and / or check the refrigerant level.

8. An air conditioner, comprising: A first temperature detection device is used to detect the temperature of the evaporator of the air conditioner; A second temperature detection device is used to detect the temperature at the target location as described in any one of claims 1 to 7; The controller is communicatively connected to the first temperature detection device and the second temperature detection device, respectively. A memory storing program instructions configured to cause the air conditioner to perform the control method according to any one of claims 1 to 7 when executed by the controller.

9. The air conditioner according to claim 8, wherein, The second temperature detection device is configured to be detachable so that it can be removed from the air conditioner; The second temperature detection device is wirelessly connected to the controller.

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