Air conditioner and control method for preventing freezing of the air conditioner

Abstract

The application belongs to the technical field of air conditioners, and specifically provides an air conditioner and a control method for preventing freezing of the air conditioner. The control method comprises the following steps: obtaining the temperature of an evaporator of the air conditioner and recording the temperature 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 the first current temperature T1 is less than or equal to the first preset temperature Ts1, obtaining the temperature at a target position in a room where the air conditioner is located and recording the temperature 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 the second current temperature T2 is greater than the second preset temperature Ts2, adjusting a horizontal air deflector or a fan of the air conditioner according to a preset rule until the horizontal air deflector is adjusted to the highest blowing position or the rotating speed of the fan reaches the maximum rotating speed, or until the first current temperature T1 is greater than the first preset temperature Ts1. The application reduces the risk of freezing of the evaporator by using the surrounding environment.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning technology, and specifically provides an air conditioner and a control method for preventing air conditioner freezing. Background Technology

[0002] When existing air conditioners operate in other modes that cool the air inside, such as cooling or dehumidifying, the evaporator surface temperature can easily become too low, leading to icing, or freezing, due to factors such as low intake air temperature, insufficient airflow, and insufficient refrigerant circulation. Once the evaporator freezes, it not only affects its cooling efficiency but also causes phenomena such as water spraying and ice formation.

[0003] To overcome these problems, existing air conditioners typically reduce the compressor frequency or even shut down the compressor when operating in cooling or dehumidification mode to reduce the evaporator's cooling capacity. However, this results in the air conditioner being frequently turned on and off, causing significant fluctuations in cooling temperature and impacting the user experience. Summary of the Invention

[0004] One object of the present invention is to solve the above-mentioned technical problems in the prior art.

[0005] Another objective of this invention is to enable air conditioners to utilize the surrounding environment to reduce the risk of the evaporator freezing.

[0006] To achieve the above objectives, the present invention provides, in a first aspect, a control method for preventing air conditioning from freezing, comprising:

[0007] Obtain the temperature of the evaporator of the air conditioner and record it as the first current temperature T1;

[0008] 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.

[0009] 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;

[0010] 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.

[0011] If the temperature is greater than the preset temperature Ts1, adjust the horizontal air guide plate or fan of the air conditioner according to the preset rules until the horizontal air guide plate is adjusted to the highest blowing position or the fan speed reaches the maximum speed, or the first current temperature T1 is greater than the first preset temperature Ts1.

[0012] Optionally, the location of the air conditioner and the target location are opposite sides of the room.

[0013] Optionally, there may be multiple target locations;

[0014] 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:

[0015] Obtain the temperature at each of the target locations within the room where the air conditioner is located;

[0016] 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.

[0017] Optionally, the step of adjusting the horizontal air guide plate or fan of the air conditioner according to a preset rule until the horizontal air guide plate is adjusted to the highest blowing position or the fan speed reaches the maximum speed, or the first current temperature T1 is greater than the first preset temperature Ts1, includes:

[0018] The air blowing position of the horizontal air guide plate of the air conditioner is gradually adjusted upward according to the preset angle;

[0019] After each adjustment of the preset duration, the first current temperature T1 is obtained;

[0020] If the first current temperature T1 is greater than the first preset temperature Ts1, it means that the evaporator is not at risk of freezing, and the horizontal air guide plate is controlled to maintain its current position.

[0021] If the horizontal air guide plate is adjusted to the highest air blowing position, and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, it indicates that the evaporator is at risk of freezing, and the air conditioner is controlled to turn on the anti-freeze protection mode.

[0022] or,

[0023] The speed of the air conditioner fan is gradually increased according to the preset step size;

[0024] After each adjustment of the second preset duration t2, the first current temperature T1 is obtained;

[0025] If the first current temperature T1 is greater than the first preset temperature Ts1, it means that the evaporator is not at risk of freezing, and the fan is controlled to maintain the current speed.

[0026] If the fan speed is increased to the maximum speed and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, it indicates that the evaporator is at risk of freezing, and the air conditioner is controlled to activate the anti-freeze protection mode.

[0027] Optionally, it also includes: if the second current temperature T2 is less than or equal to the second preset temperature Ts2, the air conditioner is controlled to activate the anti-freeze protection mode.

[0028] Optionally, the anti-freeze protection mode includes: controlling the compressor of the air conditioner to reduce its frequency until it stops.

[0029] Optionally, 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.

[0030] In a second aspect, the present invention also provides an air conditioner, comprising:

[0031] A first temperature detection device is used to detect the temperature of the evaporator of the air conditioner;

[0032] The second temperature detection device is used to detect the temperature at the target location as described in any one of the first aspects;

[0033] The controller is communicatively connected to the first temperature detection device and the second temperature detection device, respectively.

[0034] The memory stores program instructions that, when executed by the controller, enable the air conditioner to perform the control method described in any one of the first aspects.

[0035] Optionally, 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.

[0036] Optionally, the back of the second temperature sensing device is provided with a switch and adhesive backing. The adhesive backing is used to fix the second temperature sensing device to the wall. The switch is configured to close when the second temperature sensing device is removed from the air conditioner or fixed to the wall, so that the second temperature sensing device can be communicatively connected to the controller.

[0037] Based on the foregoing description, those skilled in the art will understand that in the aforementioned technical solution of this invention, by determining whether the first current temperature T1 of the evaporator is less than or equal to the first preset temperature Ts1, it is determined whether the evaporator is at risk of freezing. If a freezing risk exists, the temperature at the target location in the room where the air conditioner is located is obtained and recorded as the second current temperature T2. By determining whether the second current temperature T2 is greater than the second preset temperature Ts2, it is determined whether the temperature distribution in the room is uniform. When the temperature distribution in the room is uneven, the blowing position (or fan speed) of the air conditioner's horizontal air guide plate is adjusted upwards according to a preset rule, so that the cold air blown by the air conditioner is directed higher and farther, allowing the high-temperature air at more distant locations in the room to circulate, thereby making the room temperature more uniform. During this process, because there are high-temperature areas in the room, the temperature of the air entering the air conditioner will rise, causing the evaporator to experience a certain degree of temperature rise, thus allowing the air conditioner to utilize the surrounding environment to reduce the risk of the evaporator freezing. At the same time, it also avoids large fluctuations in cooling temperature caused by frequent shutdowns and restarts of the air conditioner.

[0038] Furthermore, by positioning the air conditioner and the target location on opposite sides of the room, the technology of obtaining the temperature at the target location within the room can more accurately determine whether the temperature distribution within the room is uniform.

[0039] Furthermore, by configuring the second temperature detection device for detecting the temperature at a target location in the room as detachable, the user can place the second temperature detection device in a suitable location according to the room layout, making the present invention applicable to various types of room layouts.

[0040] Furthermore, by providing a switch and adhesive backing on the back of the second temperature detection device, the switch automatically closes and communicates with the air conditioner's controller when the second temperature detection device is removed from the air conditioner or fixed to the wall, and it can be fixed to any position on the wall using the adhesive backing. Therefore, the air conditioner of the present invention is more intelligent.

[0041] Other beneficial effects of the present invention 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 objectives, features and advantages of the present invention. Attached Figure Description

[0042] To more clearly illustrate the technical solution of the present invention, some embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that the same reference numerals may indicate the same or similar parts or components in different drawings; the drawings of the present invention are not necessarily drawn to scale.

[0043] In the attached image:

[0044] Figure 1 This is a schematic diagram of the structure of an air conditioner provided by the present invention;

[0045] Figure 2 This is a cross-sectional schematic diagram of the indoor unit of an air conditioner provided by the present invention;

[0046] Figure 3 This is a schematic diagram of the refrigerant circulation system of an air conditioner provided by the present invention;

[0047] Figure 4 This is a schematic block diagram of an air conditioner in some embodiments of the present invention;

[0048] Figure 5 This is a first isometric view of the second temperature detection device in some embodiments of the present invention;

[0049] Figure 6 This is a second isometric view of the second temperature detection device in some embodiments of the present invention;

[0050] Figure 7 This is a flowchart of the main steps of the air conditioner antifreeze control method in some embodiments of the present invention;

[0051] Figure 8 This is a schematic diagram of a scenario for detecting room temperature in some embodiments of the present invention;

[0052] Figure 9 This is a schematic diagram of another scenario for detecting room temperature in some embodiments of the present invention;

[0053] Figure 10 This is a flowchart of the steps for adjusting the transverse air guide plate in some embodiments of the present invention;

[0054] Figure 11 This is a flowchart of the steps for adjusting the fan in some embodiments of the present invention;

[0055] Figure 12 This is a flowchart of some steps of the air conditioner antifreeze control method in other embodiments of the present invention. Detailed Implementation

[0056] Those skilled in the art should understand that the embodiments described below are merely a part of the embodiments of the present invention, and not all of the embodiments of the present invention. These partial embodiments are intended to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those skilled in the art without creative effort should still fall within the scope of protection of the present invention.

[0057] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can also refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] Furthermore, it should be noted that in the description of this invention, the terms "coldness" and "heat" are two descriptions of the same physical state. That is, the higher the "coldness" of a target object (e.g., evaporator, air, condenser, etc.), the lower its "heat," and vice versa. A target object absorbs "coldness" while releasing "heat," and releases "coldness" while absorbing "heat." A target object retains "coldness" or "heat" to maintain its current temperature. "Refrigeration" and "heat absorption" are two descriptions of the same physical phenomenon; that is, a target object (e.g., an evaporator) absorbs heat while refrigerating.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] In this invention, unless otherwise specified, the fans described below refer to the fans 230 in the indoor unit 200.

[0065] 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.

[0066] like Figure 3 As shown, in this invention, the refrigerant circulation system of the air conditioner mainly includes a compressor 110, a condenser 120, an expansion valve 130, and an evaporator 220. The compressor 110, condenser 120, and expansion valve 130 are arranged in the outdoor unit 100, and the evaporator 220 is arranged in the indoor unit 200. Furthermore, the expansion valve 130 is an electronic expansion valve, enabling the air conditioner to automatically control the opening degree of the expansion valve 130.

[0067] like Figure 4 As shown, in some embodiments of the present invention, the air conditioner further includes a first temperature detection device 310 and a second temperature detection device 320. 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 a target location within the room.

[0068] In some embodiments of the present invention, the location of the air conditioner (specifically, the indoor unit 200) and the target location are opposite sides of the room. Furthermore, there can be one or more target locations. Each target location can be equipped with a second temperature detection device 320.

[0069] Furthermore, the first temperature detection device 310 and / or the second temperature detection device 320 can be any feasible device, such as a temperature sensor.

[0070] In some embodiments of the present invention, the second temperature detection device 320 is configured to be detachable, so that the second temperature detection device 320 can be removed from the air conditioner (specifically, the indoor unit 200). The second temperature detection device 320 is wirelessly connected to the air conditioner controller 400.

[0071] like Figure 5 and Figure 6 As shown, a switch 321 and adhesive 322 are provided on the back of the second temperature detection device 320. The adhesive 322 is used to fix the second temperature detection device 320 to the wall. The switch 321 is configured to close when the second temperature detection device 320 is removed from 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 communicates with the controller 400.

[0072] Furthermore, the second temperature detection device 320 also includes a battery and a solar charging panel. The battery provides power to the second temperature detection device 320 for detecting temperature and sending temperature signals to the air conditioner. The solar charging panel charges the battery to avoid frequent battery swapping and recharging by the user.

[0073] Go back and continue reading Figure 4 In some embodiments of the present invention, the air conditioner further includes a controller 400 and a memory 500. The controller 400 is communicatively connected to a first temperature detection device 310 and a 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 below when executed by the controller 400.

[0074] The memory 500 may include main memory and non-volatile memory, and provides program instructions 510 and data to the controller 400. For example, the main memory may be high-speed random-access memory (RAM).

[0075] In this invention, 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), network processor (NP), digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, microprocessor, and any other conventional processor.

[0076] The following reference Figures 7 to 11 The following provides a detailed description of the air conditioner antifreeze control method in some embodiments of the present invention.

[0077] like Figure 7 As shown, in some embodiments of the present invention, the air conditioner anti-freezing control method includes:

[0078] Step S110: Obtain the temperature of the evaporator 220 of the air conditioner and record it as the first current temperature T1.

[0079] Specifically, when the air conditioner is running in other modes that can cool the air inside, such as cooling mode or dehumidification mode, the temperature of the evaporator 220 of the air conditioner is obtained in real time through the first temperature detection device 310, and the obtained temperature is recorded as the first current temperature T1.

[0080] Step S120: Determine whether the first current temperature T1 is less than or equal to the first preset temperature Ts1, so as to determine whether there is a risk of freezing in the evaporator 220.

[0081] In this invention, if the temperature of the evaporator 220 is less than or equal to a 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. Therefore, the first preset temperature Ts1 can be determined based on multiple experiments to find the critical temperature at which the evaporator 220 freezes, and this critical temperature can be defined as the first preset temperature Ts1. For example, the first preset temperature Ts1 can be -1℃, 0℃, 1℃, etc.

[0082] In this invention, if the temperature of the evaporator 220 is greater than the first preset temperature Ts1, then the process returns to continue executing step S110.

[0083] Step S130: If the temperature is less than or equal to the target temperature within 600 meters of the room where the air conditioner is located, obtain the temperature and record it as the second current temperature T2.

[0084] like Figure 8 As shown, in some embodiments of the present invention, there is one target location, and the location of the air conditioner and the target location are opposite sides of room 600.

[0085] Alternatively, those skilled in the art can set multiple target locations as needed. Then, step S130 further includes: acquiring the temperature at each target location within the room 600 where the air conditioner is located; recording the average of all temperatures as the second current temperature T2, or recording the highest of all temperatures as the second current temperature T2.

[0086] like Figure 9 As shown, in other embodiments of the present invention, those skilled in the art can replace the second temperature detection device 320 with a temperature pickup plate 330 as needed. There are at least two temperature pickup plates 330. Then, an infrared camera electrically connected to the controller 400 is installed on the indoor unit 200, and the temperature at the target location within the room 600 where the air conditioner is located is obtained through the following steps:

[0087] Step S131: Acquire an infrared image and identify at least two temperature pickup pieces 330 from the infrared image, that is, identify all temperature pickup pieces 330.

[0088] Step S132: Identify the temperature pickup piece 330 with the highest temperature and set its corresponding temperature as the second current temperature T2.

[0089] exist Figure 9 In the illustrated embodiment, the temperature pickup plate 330 can be any thin sheet with good thermal conductivity, such as an iron sheet, copper sheet, aluminum sheet, etc. Furthermore, the surface of the temperature pickup plate 330 can be coated with various colors to match the color of the wall.

[0090] Those skilled in the art will understand that by replacing the second temperature detection device 320 with the temperature pickup plate 330, the temperature pickup plate 330 can be integrated with the wall, making it more aesthetically pleasing.

[0091] Step S140: Determine whether the second current temperature T2 is greater than the second preset temperature Ts2, so as to determine whether the temperature distribution in room 600 is uniform.

[0092] The second preset temperature Ts2 is the set temperature that the user sets for the air conditioner. For example, if the user sends a temperature setting command to the air conditioner via remote control and adjusts the set temperature to 24℃, then the second preset temperature Ts2 is 24℃.

[0093] Those skilled in the art will understand that when an air conditioner cools or dehumidifies room 600, factors such as the placement of the indoor unit 200 and the fact that cold air is heavier than hot air often prevent the air conditioner from cooling room 600 evenly, resulting in uneven temperature distribution within room 600. Furthermore, dead zones may appear within room 600, where air does not participate in the air circulation generated during cooling, leading to higher temperatures in these zones. This invention, by comparing the second current temperature T2 with the second preset temperature Ts2, enables the air conditioner to automatically determine whether the temperature distribution within room 600 is uniform.

[0094] Specifically, when the second current temperature T2 is greater than the second preset temperature Ts2, it indicates that the temperature distribution within room 600 is uneven. When the second current temperature T2 is less than or equal to the second preset temperature Ts2, it indicates that the temperature distribution within room 600 is uniform.

[0095] In this invention, the target location includes dead zones that do not participate in air circulation.

[0096] and Figure 9 Corresponding to the embodiment shown, step S140 may further include:

[0097] Step S141: Determine the temperature pickup piece 330 with the lowest temperature and record its corresponding temperature as the third current temperature T3;

[0098] Step S142: Determine whether the difference between the second current temperature T2 and the third current temperature T3 is greater than the second preset temperature Ts2.

[0099] In step S142, the second preset temperature Ts2 is different from the set temperature described above; it is a value characterizing the temperature uniformity within room 600. Specifically, the second preset temperature Ts2 can be 1℃, 2℃, 2.5℃, 3℃, etc.

[0100] In step S150, if the temperature is greater than the preset temperature, adjust the horizontal air guide plate 240 or the fan 230 of the air conditioner according to the preset rules until the horizontal air guide plate 240 is adjusted to the highest blowing position or the fan 230 reaches the maximum speed, or the first current temperature T1 is greater than the first preset temperature Ts1.

[0101] like Figure 10 As shown, step S150 may further include:

[0102] Step S1511: Adjust the air blowing position of the horizontal air guide plate 240 of the air conditioner upward step by step according to the preset angle.

[0103] The preset angle can be any feasible angle such as 3°, 5°, or 8°.

[0104] Step S1512: After each adjustment of the first preset duration t1, the first current temperature T1 is obtained again.

[0105] The first preset duration t1 can be any feasible duration such as 30S, 1min, or 90S.

[0106] Step S1513: If the first current temperature T1 is greater than the first preset temperature Ts1, it means that there is no risk of freezing in the evaporator 220, and the horizontal air guide plate 240 is controlled to maintain its current position.

[0107] In step S1514, if the horizontal air guide plate 240 is adjusted to the highest blowing position and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, it indicates that the evaporator 220 is at risk of freezing, and the air conditioner is controlled to turn on the anti-freeze protection mode.

[0108] In addition, those skilled in the art can, as needed, replace steps S1511 to S1514 with adjusting the horizontal air guide plate 240 to the highest blowing position, and after a period of time (e.g., 30 seconds, 1 minute, 90 seconds, or any feasible duration), obtaining the first current temperature T1 again. If the first current temperature T1 is greater than the first preset temperature Ts1, it indicates that the evaporator 220 is not at risk of freezing, and the horizontal air guide plate 240 is controlled to maintain its current position. If the first current temperature T1 is still less than or equal to the first preset temperature Ts1, it indicates that the evaporator 220 is at risk of freezing, and the air conditioner is controlled to activate the anti-freeze protection mode.

[0109] The anti-freeze protection mode includes controlling the air conditioner compressor 110 to reduce its frequency until it stops. Specifically, after each frequency reduction, the compressor 110 will re-obtain the first current temperature T1 after a certain period of time (e.g., 30 seconds, 1 minute, 90 seconds, or any feasible duration). If the first current temperature T1 is greater than the first preset temperature Ts1, it indicates that the evaporator 220 is not at risk of freezing, and the compressor 110 will maintain its current frequency. If the first current temperature T1 is still less than or equal to the first preset temperature Ts1, the compressor 110 will continue to reduce its frequency until it stops.

[0110] Alternatively, such as Figure 11 As shown, step S150 may further include:

[0111] Step S1521: Adjust the speed of the air conditioner fan 230 step by step according to the preset step size.

[0112] The preset step size is any feasible rotational speed such as 50r / min, 80r / min, 150r / min, 300r / min, etc.

[0113] Step S1522: After each adjustment of the second preset duration t2, obtain the first current temperature T1.

[0114] The second preset duration t2 can be the same as or different from the first preset duration t1.

[0115] Step S1523: If the first current temperature T1 is greater than the first preset temperature Ts1, it means that there is no risk of freezing in the evaporator 220, and the fan 230 is controlled to maintain the current speed.

[0116] In step S1524, if the fan 230 is adjusted to the maximum speed and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, it indicates that the evaporator 220 is at risk of freezing, and the air conditioner is controlled to turn on the anti-freeze protection mode.

[0117] In addition, those skilled in the art can, as needed, replace steps S1521 to S1524 with adjusting the fan 230 to its maximum speed and, after a period of time (e.g., 30 seconds, 1 minute, 90 seconds, or any feasible duration), obtaining the first current temperature T1 again. If the first current temperature T1 is greater than the first preset temperature Ts1, it indicates that the evaporator 220 is not at risk of freezing, and the fan 230 is controlled to maintain its current speed. If the first current temperature T1 is still less than or equal to the first preset temperature Ts1, it indicates that the evaporator 220 is at risk of freezing, and the air conditioner is controlled to activate the anti-freeze protection mode.

[0118] The anti-freeze protection mode is the same as above.

[0119] Based on the foregoing description, those skilled in the art will understand that, in some embodiments of the present invention, by detecting whether the temperature within room 600 is uniform, and when the temperature distribution within room 600 is uneven, the airflow position of the horizontal air guide plate 240 of the air conditioner (or the rotation speed of the fan 230) can be adjusted upwards according to a preset pattern. This allows the cold air blown out by the air conditioner to be directed higher and farther, circulating even the hot air at more distant locations within room 600, thereby making the temperature within room 600 more uniform. During this process, because there are areas with higher temperatures within room 600, the temperature of the air entering the air conditioner will rise, causing the evaporator 220 to experience a certain degree of temperature increase. This allows the air conditioner to utilize the surrounding environment to reduce the risk of the evaporator 220 freezing. Simultaneously, it avoids large fluctuations in cooling temperature caused by frequent start-ups and shutdowns of the air conditioner.

[0120] like Figure 12 As shown, in some other embodiments of the present invention, compared with some embodiments described above, the air conditioner anti-freezing control method further includes:

[0121] In step S210, the compressor 110 of the air conditioner is controlled to reduce its frequency until it stops.

[0122] When the result of step S140 is that the second current temperature T2 is less than or equal to the second preset temperature Ts2, step S210 is executed. That is, if the second current temperature T2 is less than or equal to the second preset temperature Ts2, the air conditioner is controlled to activate the anti-freeze protection mode.

[0123] In step S220, the air conditioner is controlled to send a reminder message to remind the user to clean the filter and / or check the refrigerant level.

[0124] When the result of step S140 is that the second current temperature T2 is less than or equal to the second preset temperature Ts2, step S220 is executed.

[0125] When the result of step S150 is to control the air conditioner to turn on the anti-freeze protection mode, step S220 is executed.

[0126] Based on the foregoing description, those skilled in the art will understand that in other embodiments of the present invention, when there is a risk of freezing in the evaporator 220, the user can also be reminded to clean the filter and / or check the refrigerant level.

[0127] Furthermore, in some other embodiments of the present invention, in order to prevent the air conditioner from mistakenly reminding the user to clean the filter and / or check the refrigerant level when it is operating normally, the air conditioner anti-freeze control method further includes: when the compressor 110 is detected to reduce its frequency until it stops M times within a preset time period, controlling the air conditioner to issue a reminder message to remind the user to clean the filter and / or check the refrigerant level. Wherein, M is a natural number not less than 2.

[0128] The technical solutions of the present invention have been described in conjunction with several embodiments above. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Without departing from the technical principles of the present invention, those skilled in the art can disassemble and combine the technical solutions in the above embodiments, and can also make equivalent changes or substitutions to related technical features. Any changes, equivalent substitutions, improvements, etc., made within the technical concept and / or technical principles of the present invention will fall within the scope of protection of the present invention.

Claims

1. A control method for preventing freezing of an air conditioner, comprising: obtaining a temperature of an evaporator of the air conditioner and recording the temperature as a first current temperature T1; determining whether the first current temperature T1 is less than or equal to a first preset temperature Ts1 to determine whether the evaporator is at risk of freezing; if yes, obtaining a temperature at a target position in a room in which the air conditioner is located and recording the temperature as a second current temperature T2; 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; if yes, adjusting a horizontal air deflector or a fan of the air conditioner according to a preset rule until the horizontal air deflector is adjusted to a highest blowing position or a rotating speed of the fan reaches a maximum rotating speed, or the first current temperature T1 is greater than the first preset temperature Ts1. 2.The control method according to claim 1, wherein the position in which the air conditioner is located and the target position are opposite sides of the room. 3.The control method according to claim 1, wherein the target position is a plurality of positions; the step of obtaining the temperature at the target position in the room in which the air conditioner is located and recording the temperature as the second current temperature T2 comprises: obtaining the temperature at each of the target positions in the room in which the air conditioner is located; and recording an average of all the temperatures as the second current temperature T2, or recording a maximum one of all the temperatures as the second current temperature T2. 4.The control method according to claim 1, wherein the step of adjusting the horizontal air deflector or the fan of the air conditioner according to the preset rule until the horizontal air deflector is adjusted to the highest blowing position or the rotating speed of the fan reaches the maximum rotating speed, or the first current temperature T1 is greater than the first preset temperature Ts1 comprises: adjusting the blowing position of the horizontal air deflector of the air conditioner by a preset angle step by step; after each adjustment for a first preset time t1, obtaining the first current temperature T1; if the first current temperature T1 is greater than the first preset temperature Ts1, indicating that the evaporator is not at risk of freezing, controlling the horizontal air deflector to maintain a current position; if the horizontal air deflector is adjusted to the highest blowing position and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, indicating that the evaporator is at risk of freezing, controlling the air conditioner to start a freezing prevention protection mode; or adjusting the rotating speed of the fan of the air conditioner by a preset step size step by step; after each adjustment for a second preset time t2, obtaining the first current temperature T1; if the first current temperature T1 is greater than the first preset temperature Ts1, indicating that the evaporator is not at risk of freezing, controlling the fan to maintain a current rotating speed; if the fan is adjusted to the maximum rotating speed and the first current temperature T1 is still less than or equal to the first preset temperature Ts1, indicating that the evaporator is at risk of freezing, controlling the air conditioner to start the freezing prevention protection mode. 5.The control method according to claim 1, further comprising: The second current temperature T2 is less than or equal to a second preset temperature Ts2, and the air conditioner is controlled to start a freeze protection mode.

6. The control method according to claim 4 or 5, wherein The freeze protection mode comprises: controlling the compressor of the air conditioner to reduce frequency until shutdown.

7. The control method according to claim 4, further comprising, after said step of controlling the air conditioner to turn on the freeze-protection mode: The air conditioner is controlled to send a reminder information to remind a user to clean a filter screen and / or check a refrigerant amount.

8. An air conditioner comprising: a first temperature detection device configured to detect a temperature of an evaporator of the air conditioner; a second temperature detection device configured to detect a temperature at a target location according to any one of claims 1 to 7; a controller communicatively connected to the first temperature detection device and the second temperature detection device, respectively; a memory storing program instructions configured to enable 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 in a detachable form to enable the second temperature detection device to be detached from the air conditioner; the second temperature detection device is wirelessly communicatively connected to the controller.

10. The air conditioner according to claim 9, wherein a back of the second temperature detection device is provided with a switch and a back adhesive, the back adhesive being configured to fix the second temperature detection device to a wall, the switch is configured to be closed when the second temperature detection device is detached from the air conditioner or fixed to the wall to communicatively connect the second temperature detection device and the controller together.

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