Air conditioner anti-freezing control method and device and air conditioner

Abstract

The application provides an anti-freezing control method and device of an air conditioner and the air conditioner. The method comprises the following steps: acquiring the inlet pipe temperature of the indoor unit of the air conditioner; if the inlet pipe temperature is greater than or equal to a first threshold value, determining whether the middle pipe temperature collected by each electric heating device is less than a second threshold value; if the middle pipe temperature collected by the temperature sensing device is less than the second threshold value, starting the corresponding electric heating device to adjust the middle pipe temperature to the first preset range; and if the inlet pipe temperature is less than the first threshold value, starting at least one electric heating device located in the middle of the upper and lower directions of the evaporator. The embodiment of the application identifies the current operating state and the environment through the inlet pipe temperature, and then identifies whether there is a risk of anti-freezing protection through the middle pipe temperature, and reasonably starts the electric heating device at the corresponding position, so as to avoid frequent anti-freezing protection caused by severe working conditions and low road pipe temperature of the ducted air conditioner, maintain constant room temperature, improve user comfort, and reduce product after-sales maintenance rate.

Description

Technical Field

[0001] This invention relates to the field of air conditioner antifreeze technology, and more specifically, to an air conditioner antifreeze control method, device, and air conditioner. Background Technology

[0002] In multi-split air conditioning systems, an anti-freeze program is typically designed to prevent the indoor unit surface from freezing due to excessively low indoor unit temperature. This anti-freeze program works as follows: when the indoor unit pipe temperature is detected to be below a certain value and remains so for a certain period, it is considered that the indoor unit surface has frozen or the risk of freezing is high. Therefore, the anti-freeze protection is activated, and the system will shut down and begin ventilation to defrost.

[0003] When an air conditioner operates under harsh conditions or malfunctions such as valve leakage or low airflow, the system becomes unstable and will continuously and frequently enter anti-freeze protection mode, resulting in large fluctuations in indoor temperature and reduced user comfort. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a control method for preventing air freezing in an air conditioner. The evaporator of the air conditioner is equipped with multiple temperature sensing devices and multiple independently controlled electric heating devices. Each temperature sensing device is arranged in the middle of a flow path at a different height on the evaporator, and the height of each electric heating device corresponds one-to-one with the temperature sensing device. The method includes: acquiring the inlet pipe temperature of the indoor unit of the air conditioner; if the inlet pipe temperature is greater than or equal to a first threshold, determining whether the middle pipe temperature collected by each temperature sensing device is less than a second threshold; if there is a middle pipe temperature collected by a temperature sensing device that is less than the second threshold, activating the corresponding electric heating device to adjust the middle pipe temperature to a first preset range; if the inlet pipe temperature is less than the first threshold, activating at least one electric heating device located in the middle of the vertical direction of the evaporator.

[0005] The air conditioner anti-freeze control method provided in this embodiment of the invention can identify the current operating status and environment by the inlet pipe temperature, and then identify whether there is a risk of anti-freeze protection by the middle pipe temperature. It can then reasonably activate the electric heating device at the corresponding location, thereby avoiding frequent anti-freeze protection caused by harsh operating conditions and low temperature of the lower pipe of the air duct unit, maintaining a constant room temperature, improving user comfort, and reducing the product after-sales maintenance rate.

[0006] Optionally, activating the corresponding electric heating device to adjust the temperature of the middle tube to a first preset range includes: if the temperature of the middle tube collected by the temperature sensing device at any height in the vertical direction of the evaporator is less than the second threshold, then activating the corresponding electric heating device to adjust the temperature of the middle tube to the first preset range; if the temperature of the middle tube collected by all the temperature sensing devices is less than the second threshold, then activating all the electric heating devices to adjust the temperature of each middle tube to the first preset range.

[0007] In this embodiment of the invention, by turning on the electric heating device at the corresponding position, the pipeline of the evaporator can be heated through the drive of the motor and the fan, thereby preventing the temperature from getting too low and preventing the system from entering the anti-freeze protection.

[0008] Optionally, after activating at least one of the electric heating devices located in the middle of the vertical direction of the evaporator, the method further includes: adjusting the resistance value of the activated electric heating device to adjust the inlet pipe temperature to a second preset range; the lower limit of the second preset range is greater than the lower limit of the first preset range.

[0009] In this embodiment of the invention, the temperature of the inlet tube is precisely controlled by activating the electric heating device located in the middle, thus avoiding the need for anti-freezing protection.

[0010] Optionally, the resistance value of the activated electric heating device is adjusted based on the following method: calculating the difference between the temperature of the middle tube (which is less than the second threshold) and the lower limit of the first preset range; if the difference is greater than the third threshold and lasts for a preset duration, then setting the resistance value of the corresponding electric heating device to a first value; if the difference is less than the third threshold and greater than the fourth threshold, then increasing or decreasing the resistance value of the corresponding electric heating device by a first adjustment range; if the difference is less than or equal to the fourth threshold, then increasing or decreasing the resistance value of the corresponding electric heating device by a second adjustment range; the first adjustment range is greater than the second adjustment range.

[0011] This invention provides a feasible method for adjusting the resistance value of an activated electric heating device, which can adjust the temperature of the middle tube to a first preset range and avoid freezing protection.

[0012] Optionally, the resistance value of the activated electric heating device is adjusted based on the following method: if the difference is less than or equal to a third threshold and continues for a preset time, the resistance value of the corresponding electric heating device is set to a second value; the second value is less than the first value; if the difference is less than the third threshold and greater than a fourth threshold, the resistance value of the corresponding electric heating device is increased or decreased by a first adjustment range; if the difference is less than or equal to the fourth threshold, the resistance value of the corresponding electric heating device is increased or decreased by a second adjustment range; the first adjustment range is greater than the second adjustment range.

[0013] This invention provides a feasible method for adjusting the resistance value of an activated electric heating device, which can adjust the temperature of the middle tube to a first preset range and avoid freezing protection.

[0014] Optionally, the first preset range is (-1-0]℃, and the second preset range is [0-2]℃.

[0015] The embodiments of the present invention provide a first preset range and a second preset range of values. The resistance value of the corresponding electric heating is adjusted within the above range to achieve precise control of the tube inlet temperature and avoid freezing protection.

[0016] This invention provides a control device for preventing air freezing in an air conditioner. The evaporator of the air conditioner is equipped with multiple temperature sensing devices and multiple independently controlled electric heating devices. Each temperature sensing device is arranged in the middle of a flow path at a different height on the evaporator. The height of each electric heating device corresponds one-to-one with the temperature sensing device. The device includes: an acquisition module for acquiring the inlet pipe temperature of the indoor unit of the air conditioner; an inlet pipe temperature judgment module for determining whether the middle pipe temperature collected by each temperature sensing device is less than a second threshold if the inlet pipe temperature is greater than or equal to a first threshold; a middle pipe temperature adjustment module for activating the corresponding electric heating device to adjust the middle pipe temperature to a first preset range if the middle pipe temperature collected by any of the temperature sensing devices is less than the second threshold; and an inlet pipe temperature adjustment module for activating at least one electric heating device located in the middle of the vertical direction of the evaporator if the inlet pipe temperature is less than the first threshold.

[0017] This invention provides an air conditioner, including an evaporator and a controller; the evaporator is provided with multiple temperature sensing devices and multiple independently controlled electric heating devices, each of the temperature sensing devices being arranged in the middle of a flow path at a different height in the evaporator, and the height of each electric heating device corresponding one-to-one with each of the temperature sensing devices; the controller is used to execute the above method.

[0018] Optionally, each of the electric heating devices is disposed between the motor and the evaporator; the distance between the upper electric heating device and the top of the evaporator in the vertical direction is 1 / 4 of the vertical length of the evaporator; the distance between the middle electric heating device and the top of the evaporator in the vertical direction is 1 / 2 of the vertical length of the evaporator; and the distance between the lower electric heating device and the top of the evaporator in the vertical direction is 7 / 8 of the vertical length of the evaporator.

[0019] In this embodiment of the invention, multiple electric heating devices are respectively set at different positions in the vertical direction of the evaporator, which can heat the evaporator pipeline in different areas. An electric heating device is set at a lower position near the water inlet to meet the heating needs of different areas.

[0020] This invention provides a computer-readable storage medium storing a computer program, which is read and executed by a processor to implement the above-described method.

[0021] The air conditioner antifreeze control device and air conditioner of the present invention can achieve the same technical effect as the air conditioner antifreeze control method described above. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the evaporator of the air conditioner in an embodiment of the present invention;

[0023] Figure 2 This is a schematic flowchart of an air conditioner anti-freezing control method according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic flowchart of another air conditioner anti-freezing control method in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of an air conditioner anti-freezing control device according to an embodiment of the present invention. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] When an air conditioner operates under harsh conditions or malfunctions such as valve leakage or low airflow, it may continuously and frequently enter the anti-freeze protection mode, resulting in large fluctuations in indoor temperature and poor user comfort.

[0028] Taking ducted air conditioners as an example, due to their special structure, the air volume of each path is different (the air volume near the water tray is small), resulting in poor heat exchange effect in the flow path near the water tray, which makes it easier to trigger the anti-freeze protection.

[0029] This invention provides an air conditioner electric heating structure and control method. When an abnormally low pipe temperature is detected, the electric heating is activated appropriately to reduce the freeze protection rate.

[0030] In this embodiment of the invention, the electric heating structure of the duct unit is changed from a single-piece series design to a segmented parallel design, and temperature-adjustable electric heating is used, so that each electric heating segment can be powered on independently and operated with temperature control, which can better meet actual needs; and, based on the pipe temperature detection, the actual operating scenario is judged, and the electric heating is turned on appropriately to raise the temperature, so as to avoid the system entering the anti-freeze protection.

[0031] Figure 1 A schematic diagram of the evaporator of an air conditioner is shown, with the front view, side view and top view of the evaporator shown from top to bottom.

[0032] like Figure 1As shown, electric heating devices 1, 2, and 3 are installed from top to bottom between the evaporator 7 and the motor 8 and impeller 9, respectively at 1 / 4, 1 / 2, and 7 / 8 of the evaporator height. That is, the distance between the electric heating devices and the top of the evaporator is 1 / 4, 1 / 2, and 7 / 8 of the evaporator height. Electric heating device 3 is installed relatively low, close to the water tray.

[0033] All electric heating devices are connected in parallel, allowing for individual wiring and control. Figure 1 The diagram also shows three independent electric heating connection lines 10. A central tube temperature sensing bulb 4 (Tmid1), a central tube temperature sensing bulb 5 (Tmid2), and a central tube temperature sensing bulb 6 (Tmid3) are arranged on the evaporator. All three central tube temperature sensing bulbs are positioned in the middle of the flow path corresponding to the height of the three electric heating devices mentioned above.

[0034] Each of the electric heating devices is an adjustable resistor (resistance range of 0-6Ω). Depending on different needs, the slider can be moved to different resistance values ​​to achieve different heat outputs and further realize temperature regulation.

[0035] Figure 2 The diagram illustrates a schematic flowchart of an air conditioner anti-freezing control method according to an embodiment of the present invention. The evaporator of the air conditioner is equipped with multiple temperature sensing devices and multiple independently controlled electric heating devices. Each temperature sensing device is arranged in the middle of a flow path at a different height on the evaporator, and the height of each electric heating device corresponds one-to-one with the height of each temperature sensing device. The method includes the following steps:

[0036] S202, obtain the inlet pipe temperature of the indoor unit of the air conditioner.

[0037] The inlet temperature is collected in the pipeline before entering the evaporator and can be obtained through a temperature sensor.

[0038] S204, if the inlet temperature is greater than or equal to the first threshold, then determine whether the middle tube temperature collected by each temperature sensing device is less than the second threshold.

[0039] This first threshold is used to determine if the air conditioner is experiencing a control malfunction or other cause leading to excessively high compressor output. If the inlet pipe temperature is greater than or equal to the first threshold, it indicates that the system is not experiencing excessively high compressor output due to a control malfunction or other reasons, thus preventing the overall indoor unit pipe temperature from being too low. If the inlet pipe temperature is less than the first threshold, it is necessary to consider whether it is caused by harsh operating conditions (such as low-temperature cooling) or a control malfunction (excessive compressor output, mismatched with demand). For example, the first threshold is -2℃.

[0040] The second threshold is the temperature of the middle tube that triggers antifreeze protection. If the temperature of the middle tube is lower than the second threshold, antifreeze protection will be triggered. For example, the second threshold is -1°C.

[0041] S206, if the temperature of the middle tube collected by the temperature sensing device is less than the second threshold, the corresponding electric heating device is turned on to adjust the temperature of the middle tube to the first preset range.

[0042] by Figure 1 Taking the three temperature sensors shown as an example, if the temperature of the central tube collected by one or more temperature sensors is lower than the second threshold, the electric heating device at the corresponding location will be turned on. For example, if the temperature of the central tube collected by temperature sensor 4 is lower than the second threshold, then electric heating device 1 will be turned on; if the temperature of the central tube collected by temperature sensor 5 is lower than the second threshold, then electric heating device 2 will be turned on; and if the temperature of the central tube collected by temperature sensor 6 is lower than the second threshold, then electric heating device 3 will be turned on.

[0043] Optionally, if the temperature of the middle tube collected by a temperature sensing device at any height in the vertical direction of the evaporator is less than the second threshold, the corresponding electric heating device is turned on to adjust the temperature of the middle tube to the first preset range. If the temperature of the middle tube collected by all temperature sensing devices is less than the second threshold, all electric heating devices are turned on to adjust the temperature of each middle tube to the first preset range. For example, the first preset range is (-1-0]℃.

[0044] By activating the electric heating device at the corresponding location, the evaporator pipes can be heated through the motor and fan, thus preventing the temperature from dropping too low and avoiding the system from entering anti-freeze protection mode.

[0045] S208, if the inlet pipe temperature is less than the first threshold, then at least one electric heating device located in the middle of the vertical direction of the evaporator is turned on.

[0046] If the inlet pipe temperature is below the first threshold, it indicates that the inlet pipe temperature from the outdoor unit is already very low and unfavorable. This is most likely not due to uneven airflow or flow in the indoor unit, but rather to poor operating conditions or control issues causing the compressor to output excessively high values. In this case, the overall temperature of the indoor unit is low, so the electric heating device in the middle can be turned on. Since the airflow is greatest in the middle position, the overall heating effect of the indoor unit is better.

[0047] Furthermore, after activating at least one electric heating device located in the middle of the evaporator in the vertical direction, the method further includes: adjusting the resistance value of the activated electric heating device to adjust the inlet pipe temperature to a second preset range; the lower limit of the second preset range is greater than the lower limit of the first preset range. By activating the electric heating device located in the middle, the inlet pipe temperature is precisely controlled, avoiding freezing protection. Considering that the inlet pipe temperature is slightly higher than the middle pipe temperature, the lower limit of the second preset range can be set to be greater than the lower limit of the first preset range corresponding to the middle pipe temperature. For example, the second preset range is [0-2]℃.

[0048] The air conditioner anti-freeze control method provided in this embodiment of the invention can identify the current operating status and environment by the inlet pipe temperature, and then identify whether there is a risk of anti-freeze protection by the middle pipe temperature. It can then reasonably activate the electric heating device at the corresponding location, thereby avoiding frequent anti-freeze protection caused by harsh operating conditions and low temperature of the lower pipe of the air duct unit, maintaining a constant room temperature, improving user comfort, and reducing the product after-sales maintenance rate.

[0049] Optionally, during the process of turning on the corresponding electric heating device to adjust the temperature of the central tube to the first preset range, the resistance value of the turned-on electric heating device can be adjusted in the following manner:

[0050] First, calculate the difference between the pipe temperature (below the second threshold) and the lower limit of the first preset range. Upon initial triggering of anti-freeze protection, perform the difference calculation and duration determination.

[0051] Then, if the difference is greater than the third threshold and continues for a preset duration, the resistance value of the corresponding electric heating device is set to the first value; if the difference is less than the third threshold and greater than the fourth threshold, the resistance value of the corresponding electric heating device is increased or decreased by the first adjustment range; if the difference is less than or equal to the fourth threshold, the resistance value of the corresponding electric heating device is increased or decreased by the second adjustment range; the first adjustment range is greater than the second adjustment range.

[0052] The greater the difference between the central tube temperature and the lower limit of the first preset range, the greater the corresponding adjustment range. If the central tube temperature is greater than the lower limit of the first preset range, the resistance value of the corresponding electric heating device needs to be reduced; if the central tube temperature is less than the lower limit of the first preset range, the resistance value of the corresponding electric heating device needs to be increased to keep the central tube temperature within the first preset range.

[0053] Optionally, if the initial difference between the temperature of the central tube and the lower limit of the first preset range is small, the resistance value of the activated electric heating device can be adjusted in the following manner:

[0054] If the above difference is less than or equal to the third threshold and continues for a preset duration, then the resistance value of the corresponding electric heating device is set to the second value; the second value is less than the above first value.

[0055] If the difference is less than the third threshold and greater than the fourth threshold, the resistance value of the corresponding electric heating device will be increased or decreased by the first adjustment range.

[0056] If the difference is less than or equal to the fourth threshold, the resistance value of the corresponding electric heating device is increased or decreased by the second adjustment range; the first adjustment range is greater than the second adjustment range.

[0057] In cases where the initial difference between the temperature of the middle tube and the lower limit of the first preset range is small, the initial resistance value can be set to a smaller resistance value, and then the resistance value can be increased or decreased based on the smaller resistance value. The specific adjustment method is the same as the adjustment method described above.

[0058] Based on the resistance adjustment strategy of the above-mentioned electric heating device, the temperature of the middle tube can be precisely controlled, avoiding the need for anti-freezing protection.

[0059] Figure 3 A schematic flowchart of the air conditioner anti-freezing control method in an embodiment of the present invention is shown. Figure 1 Taking the ducted air conditioner shown as an example, the method includes the following steps:

[0060] S301, received anti-freeze protection.

[0061] S302, determine whether the inlet pipe temperature Tin meets the requirement of Tin ≥ -2℃. If yes, proceed to S303; otherwise, proceed to S306.

[0062] Upon receiving the anti-freeze protection for the first time, the system first checks the inlet pipe temperature Tin.

[0063] If Tin ≥ -2℃, it indicates that the system is not experiencing excessive compressor output due to control malfunctions or other reasons, thus preventing the overall indoor unit pipe temperature from being too low. In this case, consider uneven evaporator airflow distribution, improper flow path design, etc., leading to large temperature differences in the pipes within each flow path, triggering protection due to low temperatures in some pipes. For example, in current ducted air conditioners, the temperature sensors in the pipes are often located in... Figure 1 The location of the temperature sensing bulb 6 (Tmid3) in the middle tube shown is characterized by low airflow and low temperature in the middle tube, making it prone to triggering the anti-freezing mechanism.

[0064] S303, check if the tube temperature Tmid(1-3) is ≤-1℃. If yes, proceed to S304; otherwise, proceed to S305.

[0065] By determining whether the temperature of each tube, Tmid(1-3), is ≤-1℃ (the temperature of the tube that triggers protection), it can be determined whether the anti-freeze protection is triggered.

[0066] If Tmid(1-3) are all ≤-1℃, the poor heat exchange effect may be due to factors such as low overall air volume and low indoor ambient temperature. Figure 1Taking the ducted air conditioner as an example, if only electric heating device 2 is turned on, the heating effect may be poor. Therefore, electric heating devices 1-3 are turned on simultaneously, with the target temperature of the middle pipe Tmid(1-3) = (-1-0]℃ (the energy efficiency of electric heating devices is low when all devices are turned on, but the target temperature is low). The resistance values ​​of electric heating devices 1-3 are adjusted respectively to ensure that Tmid(1-3) is running near -0.5℃, and the anti-freeze function is turned off. Otherwise, the electric heating device corresponding to Tmid≤-1℃ is turned on alone, with the target temperature of the middle pipe Tmid = [0-2]℃, and the resistance value of the corresponding electric heating device is adjusted.

[0067] S304, turn on all electric heating devices 1-3.

[0068] S305, partially activate the electric heating device.

[0069] S306, Turn on electric heating device 2.

[0070] When Tin ≥ -2℃, the scenario is not considered severe. In this case, the problem is likely due to uneven airflow and flow path. Therefore, further determine the temperature Tmid of each pipe. If all are low, turn them all on. If the pipe with the lowest temperature is the only one that is turned on (generally, turn on electric heating device 3). If Tin < -2℃, the problem is likely due to severe operating conditions (such as low-temperature refrigeration) or control failure (compressor output is too high and does not match the demand). In this case, turn on electric heating device 2 and adjust the resistance value of the electric heating device to achieve precise control of the inlet pipe temperature, with the target inlet pipe temperature Tin = [1-3]℃, thus avoiding the need for anti-freeze protection.

[0071] If Tin < -2℃, it means that the inlet pipe temperature of the outdoor unit is already very low and the conditions are very poor. It is most likely not caused by uneven airflow or air volume in the indoor unit, but by the harsh operating conditions or control problems that cause the compressor to output too high. At this time, the overall temperature of the indoor unit is low, so turn on the electric heating device 2 in the middle position. The air volume in the middle is the largest, which makes the overall heating effect of the indoor unit better. The same as the setting of the ordinary electric heating position.

[0072] S307, adjust the resistance value of the activated electric heating device to achieve the target pipe temperature and ensure stable operation.

[0073] The resistance of the electric heating element is adjusted by the difference ΔT between the target lower temperature limit and the actual pipe temperature. If, after the initial triggering of the freeze protection, ΔT > 3℃ is detected and remains so for 2 minutes, the initial resistance of the electric heating element is set to 4Ω, with a detection and adjustment cycle of 1 minute.

[0074] When |△T| > 1.5℃ is detected, the resistance value is adjusted in real time with an adjustment increment of 1Ω. If △T is positive (actual pipe temperature is greater than the lower limit of the target temperature), R decreases by 1Ω; if △T is negative (actual pipe temperature is less than the lower limit of the target temperature), R increases by 1Ω.

[0075] When |ΔT|≤1.5℃ is detected, the resistance value is adjusted in real time with an adjustment increment of 0.5Ω. Similarly, if ΔT is positive, R decreases by 0.5Ω; if ΔT is negative, R increases by 0.5Ω.

[0076] When the initial detection shows ΔT≤3℃ and this condition persists for 2 minutes, the initial resistance of the electric heating device is set to 2Ω, and the subsequent real-time adjustment strategy is the same as above.

[0077] In the cooling mode, when the indoor unit triggers the anti-freeze protection, the present invention can automatically identify the operating scenario and, based on energy efficiency, reasonably activate part or all of the electric heating to heat the indoor unit pipe temperature to the target temperature. This avoids frequent anti-freeze protection caused by harsh operating conditions and low pipe temperature in the lower circuit (near the water pan) of the ducted air conditioner, further maintaining a constant room temperature, improving user comfort, and reducing the product's after-sales maintenance rate.

[0078] This invention provides an air conditioner, including an evaporator and a controller; the evaporator is provided with multiple temperature sensing devices and multiple independently controlled electric heating devices, each temperature sensing device is arranged in the middle of a flow path at a different height in the evaporator, and the height of each electric heating device corresponds one-to-one with each temperature sensing device; the controller is used to execute the above method.

[0079] This invention proposes a segmented electric heating structure with adjustable temperature suitable for ducted air conditioners, and based on this, proposes a control method that can, under cooling conditions, when the indoor unit triggers anti-freeze protection, reasonably activate part or all of the electric heating through self-identification of the operating scenario to heat the indoor unit pipe temperature to the target temperature, thereby avoiding the indoor unit's anti-freeze protection and improving user comfort.

[0080] Optionally, each of the above-mentioned electric heating devices is disposed between the motor and the evaporator; the distance between the upper electric heating device and the top of the evaporator in the vertical direction is 1 / 4 of the vertical length of the evaporator; the distance between the middle electric heating device and the top of the evaporator in the vertical direction is 1 / 2 of the vertical length of the evaporator; and the distance between the lower electric heating device and the top of the evaporator in the vertical direction is 7 / 8 of the vertical length of the evaporator.

[0081] In this embodiment of the invention, multiple electric heating devices are respectively arranged at different positions in the vertical direction of the evaporator. Taking three electric heating devices as an example, they are arranged at 1 / 4, 1 / 2, and 7 / 8 of the evaporator height, respectively, which can heat the evaporator pipeline in different areas. Specifically, considering that the air volume near the water pan is small, resulting in poor heat exchange effect in the flow path near the water pan, an electric heating device is arranged at a lower position near the water pan. An electric heating device is arranged in the center and at the top, respectively, which can meet the heating needs of different areas.

[0082] Figure 4The diagram illustrates a structural schematic of an air conditioner anti-freezing control device according to an embodiment of the present invention. The evaporator of the air conditioner is equipped with multiple temperature sensing devices and multiple independently controlled electric heating devices. Each temperature sensing device is arranged in the middle of a flow path at a different height on the evaporator. The height of each electric heating device corresponds one-to-one with the height of each temperature sensing device. The device includes:

[0083] The acquisition module 401 is used to acquire the inlet pipe temperature of the indoor unit of the air conditioner;

[0084] The inlet pipe temperature judgment module 402 is used to determine whether the middle pipe temperature collected by each of the temperature sensing devices is less than the second threshold if the inlet pipe temperature is greater than or equal to the first threshold.

[0085] The middle tube temperature adjustment module 403 is used to turn on the corresponding electric heating device to adjust the middle tube temperature to a first preset range if the temperature of the middle tube collected by the temperature sensing device is less than the second threshold.

[0086] The inlet pipe temperature regulation module 404 is used to activate at least one of the electric heating devices located in the middle of the vertical direction of the evaporator if the inlet pipe temperature is less than the first threshold.

[0087] The air conditioner anti-freeze control device provided in this embodiment of the invention can identify the current operating status and environment by the inlet pipe temperature, and then identify whether there is a risk of anti-freeze protection by the middle pipe temperature. It can then reasonably activate the electric heating device at the corresponding location, thereby avoiding frequent anti-freeze protection caused by harsh operating conditions and low temperature of the lower pipe of the air duct unit, further maintaining a constant room temperature, improving user comfort, and reducing the product after-sales maintenance rate.

[0088] As a feasible approach, the aforementioned middle tube temperature adjustment module is specifically used for: if the temperature of the middle tube collected by the temperature sensing device at any height in the vertical direction of the evaporator is less than the second threshold, then the corresponding electric heating device is turned on to adjust the temperature of the middle tube to a first preset range; if the temperature of the middle tube collected by all the temperature sensing devices is less than the second threshold, then all the electric heating devices are turned on to adjust the temperature of each middle tube to a first preset range.

[0089] As a feasible approach, the aforementioned inlet pipe temperature adjustment module is specifically used to: adjust the resistance value of the activated electric heating device to adjust the inlet pipe temperature to a second preset range; the lower limit of the second preset range is greater than the lower limit of the first preset range.

[0090] As a feasible approach, the aforementioned middle tube temperature adjustment module is specifically used for: calculating the difference between the middle tube temperature (which is less than the second threshold) and the lower limit of the first preset range; if the difference is greater than the third threshold and continues for a preset duration, then setting the resistance value of the corresponding electric heating device to a first value; if the difference is less than the third threshold but greater than the fourth threshold, then increasing or decreasing the resistance value of the corresponding electric heating device by a first adjustment range; if the difference is less than or equal to the fourth threshold, then increasing or decreasing the resistance value of the corresponding electric heating device by a second adjustment range; the first adjustment range is greater than the second adjustment range.

[0091] As a feasible approach, the aforementioned tube temperature adjustment module is specifically used for: if the difference is less than or equal to a third threshold and continues for a preset duration, then setting the resistance value of the corresponding electric heating device to a second value; the second value is less than the first value; if the difference is less than the third threshold and greater than a fourth threshold, then increasing or decreasing the resistance value of the corresponding electric heating device by a first adjustment range; if the difference is less than or equal to the fourth threshold, then increasing or decreasing the resistance value of the corresponding electric heating device by a second adjustment range; the first adjustment range is greater than the second adjustment range.

[0092] As a feasible approach, the first preset range is (-1-0]℃, and the second preset range is [0-2]℃.

[0093] This invention also provides a computer-readable storage medium storing a computer program. When the computer program is read and executed by a processor, it implements the method provided in the above embodiments and achieves the same technical effect. To avoid repetition, further details are omitted here. The computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0094] Of course, those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by computer-controlled devices. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. The storage medium can be a memory, a disk, an optical disk, etc.

[0095] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

[0096] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0097] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0098] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A control method for preventing air conditioner freezing, characterized in that, The evaporator of the air conditioner is equipped with multiple temperature sensing devices and multiple independently controlled electric heating devices. Each temperature sensing device is arranged in the middle of a flow path at a different height within the evaporator. The height of each electric heating device corresponds one-to-one with the height of the temperature sensing device. The method includes: Obtain the inlet pipe temperature of the indoor unit of the air conditioner; If the inlet temperature is greater than or equal to the first threshold, then determine whether the middle tube temperature collected by each of the temperature sensing devices is less than the second threshold. If the temperature of the middle tube collected by the temperature sensing device is lower than the second threshold, the corresponding electric heating device is turned on to adjust the temperature of the middle tube to the first preset range. If the inlet temperature is less than the first threshold, then at least one of the electric heating devices located in the middle of the vertical direction of the evaporator is turned on.

2. The method as described in claim 1, characterized in that, The step of activating the corresponding electric heating device to adjust the temperature of the middle tube to a first preset range includes: If the temperature of the middle tube collected by the temperature sensing device at any height in the vertical direction of the evaporator is less than the second threshold, the corresponding electric heating device is turned on to adjust the temperature of the middle tube to the first preset range. If the temperature of the middle tube collected by all the temperature sensing devices is less than the second threshold, then all the electric heating devices are turned on to adjust the temperature of each middle tube to the first preset range.

3. The method as described in claim 1, characterized in that, After activating at least one of the electric heating devices located at the midpoint of the vertical direction of the evaporator, the method further includes: Adjust the resistance value of the activated electric heating device to adjust the inlet pipe temperature to a second preset range; the lower limit of the second preset range is greater than the lower limit of the first preset range.

4. The method as described in claim 2, characterized in that, The resistance value of the activated electric heating device is adjusted as follows: Calculate the difference between the temperature of the middle tube that is less than the second threshold and the lower limit of the first preset range; If the difference is greater than the third threshold and continues for a preset duration, then the resistance value of the corresponding electric heating device is set to the first value. If the difference is less than the third threshold and greater than the fourth threshold, the resistance value of the corresponding electric heating device is increased or decreased by the first adjustment range. If the difference is less than or equal to the fourth threshold, the resistance value of the corresponding electric heating device is increased or decreased by the second adjustment range; the first adjustment range is greater than the second adjustment range.

5. The method as described in claim 4, characterized in that, The resistance value of the activated electric heating device is adjusted as follows: If the difference is less than or equal to the third threshold and continues for a preset duration, then the resistance value of the corresponding electric heating device is set to the second value; the second value is less than the first value. If the difference is less than the third threshold and greater than the fourth threshold, the resistance value of the corresponding electric heating device is increased or decreased by the first adjustment range. If the difference is less than or equal to the fourth threshold, the resistance value of the corresponding electric heating device is increased or decreased by the second adjustment range; the first adjustment range is greater than the second adjustment range.

6. The method as described in claim 3, characterized in that, The first preset range is (-1-0]℃, and the second preset range is [0-2]℃.

7. A control device for preventing air conditioning freezing, characterized in that, The evaporator of the air conditioner is equipped with multiple temperature sensing devices and multiple independently controlled electric heating devices. Each temperature sensing device is arranged in the middle of a flow path at a different height within the evaporator. The height of each electric heating device corresponds one-to-one with the height of the temperature sensing device. The device includes: The acquisition module is used to acquire the inlet pipe temperature of the indoor unit of the air conditioner; The inlet pipe temperature judgment module is used to determine whether the middle pipe temperature collected by each of the temperature sensing devices is less than the second threshold if the inlet pipe temperature is greater than or equal to the first threshold. The middle tube temperature adjustment module is used to turn on the corresponding electric heating device to adjust the middle tube temperature to a first preset range if the temperature of the middle tube collected by the temperature sensing device is less than the second threshold. The inlet pipe temperature regulation module is used to activate at least one electric heating device located in the middle of the vertical direction of the evaporator if the inlet pipe temperature is less than the first threshold.

8. An air conditioner, characterized in that, Includes evaporator and controller; The evaporator is equipped with multiple temperature sensing devices and multiple independently controlled electric heating devices. Each temperature sensing device is arranged in the middle of a flow path at a different height in the evaporator, and the height of each electric heating device corresponds one-to-one with the height of each temperature sensing device. The controller is used to perform the method according to any one of claims 1-6.

9. The air conditioner as described in claim 8, characterized in that, Each of the aforementioned electric heating devices is disposed between the motor and the evaporator; The distance between the upper electric heating device and the top of the evaporator in the vertical direction is 1 / 4 of the vertical length of the evaporator; The distance between the electric heating device in the middle and the top of the evaporator in the vertical direction is 1 / 2 of the vertical length of the evaporator; The distance between the lower electric heating device and the top of the evaporator in the vertical direction is 7 / 8 of the vertical length of the evaporator.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when read and executed by a processor, implements the method as described in any one of claims 1-6.

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