Air conditioner and method for operating a drain pump thereof

Abstract

The present application provides a kind of drainage pump operation control method of air conditioner, the method comprises the following steps, records the operation power P0 of drainage pump in first time drainage process, operation current I0 And one or more of the drainage time T0 used to reduce the water level in water collecting tank from first height to second height, and determines the abnormal determination condition of drainage pump based on the above parameters.The present application also provides an air conditioner for implementing the above method.The present application can not be affected by the change of installation condition, and the adverse effects caused by the existence of silt deposition in water collecting tank, drainage pump or drainage pipeline can be effectively eliminated by this control mode.

Description

Technical Field

[0001] This invention relates to the field of air conditioner drainage control technology, and in particular to an air conditioner and a method for controlling the operation of its drainage pump. Background Technology

[0002] Ducted air conditioners and ceiling air conditioners have been widely used in people's work and life. Due to their installation method, ducted air conditioners and ceiling air conditioners often need to use a drain pump to drain the water accumulated in the water collection tank.

[0003] Due to a lack of timely cleaning or environmental factors, dust easily accumulates on the indoor heat exchanger of the air conditioner. This dust, along with the condensate produced on the heat exchanger, flows into the water collection tank. Over time, a large amount of dust accumulates in the water collection tank, eventually forming sludge. This sludge then migrates into the drain pump and drain pipes during the drainage process.

[0004] When an air conditioner is not used for a long time, the sludge deposited in the water collection tank, drain pump, or drain pipe may harden. Hardened sludge will affect the drainage effect of the drain pump, thus affecting the drainage effect. In severe cases, it may cause the drain pump to burn out and the drainage to fail.

[0005] Chinese invention patent application CN115371216A discloses an air conditioner and its control method, which determines the risk of drainage abnormalities based on the interval between two uses of the air conditioner and the operating power of the drain pump during drainage, thereby solving the problem of hardened sludge deposited in the drain pump. The above solution has the following drawbacks: it cannot determine the specific situation of blockage in the drainage system; existing technologies provide factory preset values ​​as the basis for judging operating power, but differences in installation environments can cause variations in the operation of the drain pump during drainage. The factory preset drainage pump abnormality judgment conditions cannot adequately cover all installation scenarios. For example, the length of the drain pipe and the maximum lifting height of the drain pipe can affect the operating power, operating current, or single drainage operation time of the drain pump, thus potentially leading to misjudgment. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to provide an air conditioner and its drain pump operation control method that is unaffected by changes in installation conditions, and that effectively eliminates the adverse effects that may result from silt deposits in the water collection tank, drain pump, or drain pipe.

[0007] A method for controlling the operation of a drain pump in an air conditioner, the method comprising:

[0008] The water level in the collection tank is detected. When the water level in the collection tank reaches the first water level, the drainage pump is started to drain the water until the water level in the collection tank reaches the second water level.

[0009] Record one or more of the following during the initial drainage process: the operating power P0 of the drainage pump, the operating current I0, and the drainage time T0 used to lower the water level in the collection tank from the first height to the second height.

[0010] Record one or more of the following during each subsequent drainage process: the operating power P1, operating current I1 of the drainage pump, and the time T1 taken to lower the water level in the collection tank from the first height to the second height. Combine this information with one or more of P1, I1, and T1 to determine if there are any abnormalities in the drainage pump and / or drainage channel, specifically including:

[0011] If the operating power P1 or the operating current I1 of the drain pump is too high, the drain pump is determined to be blocked.

[0012] If the operating power P1 or the operating current I1 of the drainage pump is too small, the drainage channel is determined to be blocked.

[0013] If the drain pump operating power P1 or drain pump operating current I1 is normal, but the drainage time T0 exceeds the preset drain pump operating time, it is determined that the drain pump and the drainage channel are blocked.

[0014] Specifically, the comparison parameter for determining whether the operating power of the drainage pump is too high or too low is determined based on P0, the comparison parameter for determining whether the operating power of the drainage pump is too high or too low is determined based on I0, and the preset operating time of the drainage pump is determined based on T0.

[0015] Preferably, the comparison parameter for determining whether the operating power of the drainage pump is too high or too low based on P0 includes:

[0016] The first preset power, the second preset power and the third preset power are determined based on P0. The first preset power = αP0, the second preset power = βP0, and the third preset power = γP0, where α is the preset first preset power judgment coefficient, β is the preset second preset power judgment coefficient, and γ is the preset third preset power judgment coefficient, and 0 < γ < β < 1 < α.

[0017] The comparison parameters used to determine whether the operating power of the drainage pump is too high or too low based on I0 include:

[0018] The first preset current, the second preset current and the third preset current are determined based on I0. The first preset current = xI0, the second preset current = yI0, and the third preset current = zI0, where x is the preset first power judgment coefficient, y is the preset second power judgment coefficient and z is the preset third power judgment coefficient, and 0 < z < y < 1 < x.

[0019] The determination of the preset drainage pump operating time based on T0 includes:

[0020] The operating time of the first drainage pump is determined based on T0. The operating time of the first drainage pump is δT0, where δ is a preset judgment coefficient for the operating time of the drainage pump.

[0021] Preferably, the determination that the drain pump is blocked if the drain pump operating power P1 or drain pump operating current I1 is too high specifically includes:

[0022] If the drain pump's operating power P1 is detected to be greater than the first preset power or the drain pump's operating current I1 is detected to be greater than the first preset current, the drain pump's operating speed is adjusted to P0. The drain pump operates at power P0 for a preset time, and then the drain pump's operating speed is adjusted again to the preset speed. If the drain pump's operating power or operating current is normal at this time, it is determined that the drain pump is operating normally, and the drain pump is controlled to operate at the preset speed; otherwise, it is determined that the drain pump is blocked internally, and the drain pump cleaning program is started.

[0023] Preferably, the method of determining whether the drain pump and / or drain channel is malfunctioning by combining one or more of P1, I1, and T1 further includes:

[0024] When the operating power P1 of the drainage pump is less than the second preset power but greater than the third preset power, or the operating current I1 is less than the second preset current but greater than the third preset current, the operating power of the drainage pump is increased for a period of time and then the speed of the drainage pump is adjusted back to the normal value. The operating power or operating current of the pump is then tested. If the operating power or operating current returns to normal at this time, the pump continues to operate; otherwise, the drainage channel is determined to be blocked.

[0025] Preferably, the determination that the drainage channel is blocked if the operating power P1 or the operating current I1 of the drainage pump is too small specifically includes:

[0026] When the drain pump's operating power P1 is less than the third preset power, or the operating current I1 is less than the third preset current, the air conditioner will be shut down and a reminder to clean the drain channel will be given.

[0027] Preferably, the method further includes: when it is determined that there is a blockage in the drain pump, starting a program to clean the drain pump; when it is determined that there is a blockage in the drain channel, starting a program to clean the drain channel; and when it is determined that there is both a blockage in the drain pump and a blockage in the drain channel, starting a program to clean both the drain pump and the drain channel.

[0028] The purpose of this application is also to provide an air conditioner for implementing the drain pump operation control method of any of the above-described air conditioners.

[0029] This invention, employing the aforementioned solution, can record the operating status and duration of the drain pump during the first drainage after air conditioner installation. Based on this recorded information, the air conditioner verifies the drainage process during subsequent operation, determining whether any abnormalities have occurred. It eliminates the need to pre-determine different anomaly detection parameters for different operating environments, simplifying setup. Furthermore, it can determine whether the blockage in the drainage system is specifically in the drain pump or the drainage channel, based on the drain pump's operating condition. Depending on the specific anomaly, it can initiate a targeted cleaning program or provide a manual cleaning prompt, resulting in more accurate anomaly localization. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the indoor unit of the air conditioner involved in this invention.

[0031] Figure 2 This is a schematic diagram of the control mechanism involved in the present invention.

[0032] Figure 3 This is a schematic diagram of the drainage operation control logic involved in the present invention. Detailed Implementation

[0033] The embodiments of the present invention are described in detail below.

[0034] Example 1:

[0035] This embodiment provides an air conditioner, such as Figure 1-2 As shown, the air conditioner includes an indoor unit. The indoor unit 1 includes a control mechanism 11, an indoor heat exchanger 12, a water collection tank 13, a water level sensor 14, a drain pump 15, a drain channel 16, and corresponding power cables. The indoor unit 1 has cooling and dehumidifying operation modes. In the cooling and dehumidifying operation modes, condensate will be generated on the surface of the indoor heat exchanger 12, and the generated condensate can be collected in the water collection tank 13.

[0036] The control mechanism 11 collects water level information from the water level sensor 14 and controls the start and stop of the drainage pump 15 based on the water level information. The control mechanism 11 is also used to collect the operating power (or operating current) of the drainage pump 15 and determine the operating load of the drainage pump based on the operating power (or operating current) of the drainage pump 15. When the operating load of the drainage pump 15 is abnormal, the control mechanism 11 adjusts the operating strategy of the drainage pump 15 to avoid abnormal situations such as insufficient drainage efficiency causing water to overflow from the collection tank 13 or high operating load causing the drainage pump 15 to burn out.

[0037] The water level sensor 14 can detect the water level in the collection tank 13 and control the opening and closing of the drainage pump 15 according to the water level. When the water level sensor detects that the water level in the collection tank has reached the first height, it is considered a high water level and the drainage pump needs to be started to drain the water. When the water level sensor detects that the water level in the collection tank has reached the second height, it is considered a low water level and the drainage pump is stopped, thus completing the drainage of the collection tank.

[0038] Preferably, a detection position 3 is set in the water collection tank. Detection position 3 is the detection position where the water pump starts to drain water when the indoor unit of the air conditioner has not been cooling for a long time or has been running in heating mode for a certain period of time and then switched to cooling mode again. When the indoor unit of the air conditioner has not been cooling for a long time or has been running in heating mode for a certain period of time and then switched to cooling mode again, the drain pump starts to work when the water level changes from detection position 1 or detection position 2 to detection position 3.

[0039] The water collection tank is connected to the drainage channel, and the drainage pump can discharge the water in the water collection tank into the drainage channel. The drainage channel 16 can discharge the water discharged by the drainage pump 15 to the outside of the indoor unit 1 of the air conditioner.

[0040] like Figure 2 As shown, in terms of functional modules, the air conditioner includes an initial operation judgment module 111, an operation information acquisition module 112, an operation time statistics module 113, and an operation information storage module 114.

[0041] The first operation judgment module 111 is used to determine whether the drainage pump 15 is operating for the first time. If the drainage pump 15 is operating for the first time, the operating power or operating current of the drainage pump and the total time consumed in the water collection tank from the first water level to the second water level are recorded, and the recorded operating power or operating current of the drainage pump and the total time consumed in the operation of the drainage pump are recorded in the operation information storage module 114.

[0042] The time statistics module 113 is used to record the operating time of the drainage pump 15. The operation information acquisition module 112 is used to acquire the operation information of the drainage pump 15, including the operating power, operating current, and operating time of the drainage pump. The operation information storage module 114 is used to store the operation information of the drainage pump during the first drainage and subsequent drainage processes.

[0043] The aforementioned air conditioner can record the operation information of the first drainage of the drain pump and formulate abnormal judgment conditions of the drainage system based on this. It does not require pre-storing the abnormal judgment conditions of each installation environment, making it highly applicable and easy to use.

[0044] Example 2:

[0045] This embodiment provides a method for controlling the operation of a drain pump in an air conditioner, the method comprising:

[0046] The water level in the collection tank is detected. When the water level in the collection tank reaches the first water level, the drainage pump is started to drain the water until the water level in the collection tank reaches the second water level.

[0047] Record one or more of the following during the initial drainage process: the operating power P0 of the drainage pump, the operating current I0, and the drainage time T0 used to lower the water level in the collection tank from the first height to the second height.

[0048] Record one or more of the following during each subsequent drainage process: the operating power P1, operating current I1 of the drainage pump, and the time T1 taken to lower the water level in the collection tank from the first height to the second height. Combine this information with one or more of P1, I1, and T1 to determine if there are any abnormalities in the drainage pump and / or drainage channel, specifically including:

[0049] If the operating power P1 or the operating current I1 of the drain pump is too high, the drain pump is determined to be blocked.

[0050] If the operating power P1 or the operating current I1 of the drainage pump is too small, the drainage channel is determined to be blocked.

[0051] If the drain pump operating power P1 or drain pump operating current I1 is normal, but the drainage time T0 exceeds the preset drain pump operating time, it is determined that the drain pump and the drainage channel are blocked.

[0052] Specifically, the comparison parameter for determining whether the operating power of the drainage pump is too high or too low is determined based on P0, the comparison parameter for determining whether the operating power of the drainage pump is too high or too low is determined based on I0, and the preset operating time of the drainage pump is determined based on T0.

[0053] The aforementioned method uses the initial operation information of the drain pump to determine the conditions for judging drain pump malfunctions, and can customize the conditions for judging pump malfunctions according to the actual installation environment of the air conditioner indoor unit. Furthermore, based on the operating characteristics of the drain pump, it can determine whether there is sludge or other impurities blocking the drain channel or inside the drain motor by observing the power or current during the drain pump's operation. Even when the drain motor's operating current or power is normal, it can still determine whether there is simultaneous sludge blockage in the drain channel and inside the drain pump by observing the duration of a single drain cycle. This allows for precise location of the blockage in the drain system when a drain malfunction occurs.

[0054] The method further includes:

[0055] The abnormal determination conditions for the operating power P1 of the drainage pump based on P0 include:

[0056] The first preset power, the second preset power and the third preset power are determined based on P0. The first preset power = αP0, the second preset power = βP0, and the third preset power = γP0, where α is the preset first preset power judgment coefficient, β is the preset second preset power judgment coefficient, and γ is the preset third preset power judgment coefficient, and 0 < γ < β < 1 < α.

[0057] The abnormal determination conditions for the drainage pump operating current I1 based on I0 include:

[0058] The first preset current, the second preset current and the third preset current are determined based on I0. The first preset current = xI0, the second preset current = yI0, and the third preset current = zI0, where x is the preset first power judgment coefficient, y is the preset second power judgment coefficient and z is the preset third power judgment coefficient, and 0 < z < y < 1 < x.

[0059] The determination of the preset drainage pump operating time based on T0 includes:

[0060] The operating time of the first drainage pump is determined based on T0. The operating time of the first drainage pump is δT0, where δ is a preset judgment coefficient for the operating time of the drainage pump.

[0061] The operating power P1 is compared with the first preset power, the second preset power and the third preset power to determine whether the operating power is abnormal. The operating current I1 is compared with the first preset current, the second preset current and the third preset current to determine whether the operating current is abnormal.

[0062] This method only requires pre-setting the values ​​of β, α, γ, δ, x, y, and z to determine the anomaly detection conditions under different installation environments by combining the operating parameters of the drainage pump in that specific environment. Furthermore, by combining the operating characteristics of the drainage pump and identifying the causes of excessive or insufficient operating power or current, as well as excessive drainage time, the specific location of blockages in the drainage system can be pinpointed.

[0063] In this method, determining that the drain pump is blocked if the drain pump operating power P1 or drain pump operating current I1 is too high specifically includes:

[0064] If the drain pump's operating power P1 is detected to be greater than the first preset power or the drain pump's operating current I1 is detected to be greater than the first preset current, the drain pump's operating speed is adjusted to P0. The drain pump operates at power P0 for a preset time, and then the drain pump's operating speed is adjusted again to the preset speed. If the drain pump's operating power or operating current is normal at this time, it is determined that the drain pump is operating normally, and the drain pump is controlled to operate at the preset speed; otherwise, it is determined that the drain pump is blocked internally, and the drain pump cleaning program is started.

[0065] The method also includes: when the operating power P1 of the drainage pump is less than the second preset power and greater than the third preset power, or the operating current I1 is less than the second preset current and greater than the third preset current, the operating power of the drainage pump is increased for a period of time and then the speed of the drainage pump is adjusted back to the normal value. The operating power or operating current of the pump is then detected. If the operating power or operating current returns to normal at this time, the pump continues to operate; otherwise, the drainage channel is determined to be blocked.

[0066] The following combination Figure 3 This method will be further described in this embodiment, which combines the operating power of the drainage pump with the drainage time.

[0067] like Figure 3 As shown, the specific implementation steps of this method are as follows:

[0068] Step S0: Start the program, then proceed to step S1;

[0069] Step S1: Receive the operating information set by the air conditioner user, and then proceed to step S2;

[0070] Step S2: Determine whether the operating mode set by the user is cooling or dehumidification. If the operating parameters set by the user are cooling or dehumidification, proceed to step S3; otherwise, proceed to step S4.

[0071] Step S3: Determine whether the air conditioner has received a shutdown signal. If the air conditioner has received a shutdown signal, proceed to step S13; otherwise, proceed to step S4.

[0072] Step S4: Detect the water level in the collection tank using a water level sensor, and then proceed to step S5;

[0073] Step S5: Determine the water level in the collection tank. If the detection result is that the water level is high, proceed to step S6; otherwise, proceed to step S3.

[0074] Step S6: Determine the value of X. If X = 1, proceed to step S16; otherwise, proceed to step S7.

[0075] Step S7: The drainage pump operates at a preset speed, and then proceeds to step S8;

[0076] Step S8: Record P0 and T0, then proceed to step S9;

[0077] Step S9: Detect the water level in the collection tank using a water level sensor, and then proceed to step S10;

[0078] Step S10: Determine the water level in the collection tank. If the detection result is that the water level is low, proceed to step S11; otherwise, proceed to step S7.

[0079] Step S11: Save P0, save T0, and then proceed to step S12;

[0080] Step S12: Let X = 1, then proceed to step S1;

[0081] Step S13: Determine the value of X. If X = 1, proceed to step S14; otherwise, proceed to step S44.

[0082] Step S14: The water level in the collection tank is detected by the water level sensor, the drainage pump is started, and then the process proceeds to step S15.

[0083] Step S15: Determine the water level in the collection tank. If the detection result is that the water level is low, proceed to step S44; otherwise, proceed to step S14.

[0084] Step S16: Determine the value of Y. If Y = 1, proceed to step S17; otherwise, proceed to step S18.

[0085] Step S17: Enter the pre-set cleaning drainage pump and cleaning drainage channel program. After the program is completed, proceed to step S18.

[0086] Step S18: The drainage pump operates at a preset speed, and the water level in the collection tank is detected by the water level sensor, and then proceeds to step S19.

[0087] Step S19: Determine the water level in the collection tank. If the detection result is that the water level is low, proceed to step S32; otherwise, proceed to step S20.

[0088] Step S20: Record the drainage pump power P1, and then proceed to step S21;

[0089] Step S21: Determine whether the detected drainage pump power P1 satisfies P1 > αP0. If P1 > αP0, proceed to step S22; otherwise, proceed to step S33.

[0090] Step S22: The drainage pump operates at a power of P = P0, and then proceeds to step S23;

[0091] Step S23: Calculate the drainage pump running time Ta, then proceed to step S34;

[0092] Step S24: Determine whether Ta is greater than the preset time threshold a. If Ta > a, proceed to step S25; otherwise, proceed to step S22.

[0093] Step S25: The drainage pump operates at a preset speed, and Ta = 0, then proceed to step S26;

[0094] Step S26: Record the power of the drainage pump P1, and then proceed to step S27;

[0095] Step S27: Determine whether the detected drainage pump power P1 satisfies P1 > αP0. If P1 > αP0, proceed to step S28; otherwise, proceed to step S29.

[0096] Step S28: Enter the pre-set cleaning and drainage pump program. After the program is completed, proceed to step S18.

[0097] Step S29: The drainage pump operates at a preset speed, and then proceeds to step S30;

[0098] Step S30: Detect the water level in the collection tank using a water level sensor, and then proceed to step S31;

[0099] Step S31: Determine the water level in the collection tank. If the detection result is that the water level is low, proceed to step S32; otherwise, proceed to step S20.

[0100] Step S32: The drainage pump stops running, and then proceed to step S1;

[0101] Step S33: Determine whether the detected drainage pump power P1 satisfies P1 < βP0. If P1 < βP0, proceed to step S40; otherwise, proceed to step S34.

[0102] Step S34: The drainage pump is running normally. Record the drainage pump running time T1. Detect the water level in the collection tank using the water level sensor, and then proceed to step S35.

[0103] Step S35: Determine the water level in the collection tank. If the detection result is that the water level is low, proceed to step S36; otherwise, proceed to step S34.

[0104] Step S36: The drainage pump stops running, and then proceed to step S37;

[0105] Step S37: Determine whether T1 satisfies T1>δT0. If T1>δT0, proceed to step S38; otherwise, proceed to step S39.

[0106] Step S38: Set Y = 1 and T1 = 0, then proceed to step S1;

[0107] Step S39: Set Y = 0 and T1 = 0, then proceed to step S1;

[0108] Step S40: Determine whether the detected drainage pump power P1 satisfies P1 < γP0. If P1 < γP0, proceed to step S41; otherwise, proceed to step S43.

[0109] Step S41: Remind the user to clean the drainage system, then proceed to step S42;

[0110] Step S42: The air conditioner stops, then proceed to step S44;

[0111] Step S43: Enter the pre-set cleaning and drainage channel program. After the program is completed, proceed to step S18.

[0112] Step S44: End the program.

[0113] Symbol explanation:

[0114] X: This indicates whether the drain pump is running for the first time. X=0 means the drain pump has not been run (factory default X=0), and X=1 means the drain pump has been run (not the first time).

[0115] Y: A marker indicating that the drainage pump has normal power but abnormal drainage operation. Y=1 indicates an abnormality, and Y=0 indicates no abnormality.

[0116] T0: Statistical parameters of drainage pump operation time when X=0;

[0117] T1: Statistical parameters of drainage pump operation time when X=1;

[0118] P0: The operating power of the drainage pump when X = 0;

[0119] P1: Power of the drainage pump when X=1;

[0120] P: Real-time operating power of the drainage pump;

[0121] Ta: Statistics time for the first abnormal operation mode;

[0122] a: The time threshold for determining the first abnormal operation mode, such as a preset to 1 minute;

[0123] α: First power judgment coefficient, which is preset to 1.2 in the embodiment;

[0124] β: Second power judgment coefficient, which is preset to 0.8 in the embodiment;

[0125] γ: Third power judgment coefficient, which is preset to 0.5 in the embodiment;

[0126] δ: The coefficient for judging the operation time of the drainage pump. In the embodiment, δ is preset to 1.2.

[0127] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for controlling the operation of a drain pump in an air conditioner, characterized in that, The method includes: The water level in the collection tank is detected. When the water level in the collection tank reaches the first water level, the drainage pump is started to drain the water until the water level in the collection tank reaches the second water level. Record one or more of the following during the initial drainage process: the operating power P0 of the drainage pump, the operating current I0, and the drainage time T0 used to lower the water level in the collection tank from the first height to the second height. Record one or more of the following during each subsequent drainage process: the operating power P1, operating current I1 of the drainage pump, and the time T1 taken to lower the water level in the collection tank from the first height to the second height. Combine this information with one or more of P1, I1, and T1 to determine if there are any abnormalities in the drainage pump and / or drainage channel, specifically including: If the operating power P1 or the operating current I1 of the drain pump is too high, the drain pump is determined to be blocked. If the operating power P1 or the operating current I1 of the drainage pump is too small, the drainage channel is determined to be blocked. If the drain pump operating power P1 or drain pump operating current I1 is normal, but the drainage time T1 exceeds the preset drain pump operating time, it is determined that the drain pump and the drainage channel are blocked. Among them, the abnormal judgment condition of drainage pump operating power P1 is determined based on P0, the abnormal judgment condition of drainage pump operating current I1 is determined based on I0, and the preset drainage pump operating time is determined based on T0. The abnormal determination conditions for the operating power P1 of the drainage pump based on P0 include: The first preset power, the second preset power and the third preset power are determined based on P0. The first preset power = αP0, the second preset power = βP0, and the third preset power = γP0, where α is the preset first preset power judgment coefficient, β is the preset second preset power judgment coefficient, and γ is the preset third preset power judgment coefficient, and 0 < γ < β < 1 < α. The abnormal determination conditions for the drainage pump operating current I1 based on I0 include: The first preset current, the second preset current and the third preset current are determined based on I0. The first preset current = xI0, the second preset current = yI0, and the third preset current = zI0, where x is the preset first power judgment coefficient, y is the preset second power judgment coefficient and z is the preset third power judgment coefficient, and 0 < z < y < 1 < x. The determination of the preset drainage pump operating time based on T0 includes: The operating time of the first drainage pump is determined based on T0. The operating time of the first drainage pump is δT0, where δ is a preset judgment coefficient for the operating time of the drainage pump.

2. The method for controlling the operation of the drain pump of an air conditioner according to claim 1, characterized in that, If the operating power P1 or the operating current I1 of the drain pump is too high, it is determined that the drain pump is blocked. Specifically, this includes: If the drain pump's operating power P1 is detected to be greater than the first preset power or the drain pump's operating current I1 is detected to be greater than the first preset current, the drain pump's operating speed is adjusted to P0. The drain pump operates at power P0 for a preset time, and then the drain pump's operating speed is adjusted again to the preset speed. If the drain pump's operating power or operating current is normal at this time, it is determined that the drain pump is operating normally, and the drain pump is controlled to operate at the preset speed; otherwise, it is determined that the drain pump is blocked internally, and the drain pump cleaning program is started.

3. The method for controlling the operation of the drain pump of an air conditioner according to claim 1, characterized in that, The determination of whether the drain pump and / or drain channel is abnormal by combining one or more of P1, I1, and T1 also includes: When the operating power P1 of the drainage pump is less than the second preset power but greater than the third preset power, or the operating current I1 is less than the second preset current but greater than the third preset current, the operating power of the drainage pump is increased for a period of time and then the speed of the drainage pump is adjusted back to the normal value. The operating power or operating current of the pump is then tested. If the operating power or operating current returns to normal at this time, the pump continues to operate; otherwise, the drainage channel is determined to be blocked.

4. The method for controlling the operation of the drain pump of an air conditioner according to claim 1, characterized in that, If the operating power P1 or the operating current I1 of the drainage pump is too low, it is determined that the drainage channel is blocked. Specifically, this includes: When the drain pump's operating power P1 is less than the third preset power, or the operating current I1 is less than the third preset current, the air conditioner will be shut down and a reminder to clean the drain channel will be given.

5. The method for controlling the operation of the drain pump of an air conditioner according to claim 1, characterized in that, The method further includes: when it is determined that there is a blockage in the drain pump, starting the operation program for cleaning the drain pump; when it is determined that there is a blockage in the drain channel, starting the operation program for cleaning the drain channel. If it is determined that both the drain pump and the drain channel are blocked, the operation procedure for cleaning the drain pump and the drain channel will be started.

6. An air conditioner, characterized in that, A method for controlling the operation of a drain pump in an air conditioner as described in any one of claims 1-5.

Images