An air conditioner

Abstract

The present invention discloses an air conditioner, comprising: a water receiving tray; a drain pump; a cleaner configured to eject pressurized water to clean the water receiving tray; a first controllable valve; a second controllable valve; a water pump drive unit; and a main control unit, which determines the drainage level of the drain pump based on the speed of the indoor fan and the indoor humidity, controls the output of different drive signals to the water pump drive unit, and simultaneously controls the opening and closing of the first controllable valve and the second controllable valve. When the drainage level meets a drainage threshold level, the first controllable valve is controlled to be connected, and when the first cleaning threshold level is met, the second controllable valve is controlled to be connected. The water receiving tray is cleaned using the cleaner. When the water level reaches a preset level, the second controllable valve is disconnected while the first controllable valve is controlled to be connected. When the second cleaning threshold level is met, both the first and second controllable valves are controlled to be connected. The present invention can adaptively adjust the speed of the drain pump based on the amount of condensed water and can also clean the water receiving tray.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to an air conditioner. Background Art

[0002] In related art, when the air conditioner is in cooling mode, water vapor in the air hits the low-temperature evaporator, forming condensed water that flows into the indoor unit's water collection tray. During this condensation process, impurities such as lint, dust, and hair from the low-temperature evaporator and the air are collected in the water collection tray. A drain pump then drains the condensed water from the water collection tray through a drain pipe to the outside.

[0003] As impurities accumulate in the water tray over time, they are increasingly adsorbed and precipitated there, causing the tray to become extremely dirty. Furthermore, since the drain pump is located within the tray, it can easily become clogged and prevent proper drainage. Furthermore, conventional drain pumps only have two positions: on and off. When on, the pump continuously operates at a fixed speed and maximum power until the water level drops to the point where the pump shuts off. This method fails to adjust the drainage process based on the amount of condensed water in the tray, resulting in poor drainage efficiency.

[0004] The above information disclosed in this background technology is only used to increase the understanding of the background technology of this application. Therefore, it may contain information that does not constitute the prior art known to ordinary technicians in this field. Summary of the Invention

[0005] In response to the problems pointed out in the background technology, the present application provides an air conditioner that determines the amount of condensed water based on the indoor fan speed and indoor air humidity, adaptively adjusts the speed of the drainage pump, and can clean the water tray when the water level in the water tray meets the threshold condition, thereby avoiding long-term dirt sedimentation and causing blockage of the drainage pump, thereby improving the working reliability of the drainage pump.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] The present application relates to an air conditioner, comprising:

[0008] a water receiving tray for receiving condensed water generated when the air conditioner is in operation;

[0009] a drain pump installed in the water receiving pan, the drain pump comprising a water inlet, a drain outlet and a bypass port respectively connected to the water inlet, the water inlet being connected to the water receiving pan, the drain outlet being used to discharge condensed water in the water receiving pan to the outside;

[0010] a cleaner installed in the water receiving tray and used to clean the water receiving tray when the water flow is sprayed, the cleaner being connected to the bypass port through a bypass pipe;

[0011] a first controllable valve, which is arranged on the drainage pipe at the drainage outlet;

[0012] a second controllable valve, which is provided on the pipeline between the bypass port and the cleaner;

[0013] A water pump driving unit, which is used to drive the drainage pump to operate;

[0014] a main control unit, which obtains a drainage level of the drainage pump based on both the speed of the indoor fan and the indoor humidity, controls the output of different drive signals to the water pump drive unit, and is used to drive the drainage pump to operate at a speed corresponding to the drainage level. At the same time, it also controls the opening and closing of the first controllable valve and the second controllable valve based on the drainage level, so that when the drainage level meets a drainage threshold level, the first controllable valve is controlled to be connected to drain water through the drain port; when a first cleaning threshold level is met, the second controllable valve is controlled to be connected to clean the water pan using a cleaner; when the water level reaches a preset water level, the second controllable valve is disconnected and the first controllable valve is controlled to be connected; when the second cleaning threshold level is met, the first controllable valve and the second controllable valve are controlled to be connected to clean the water pan using a cleaner while also draining water through the drain port;

[0015] The first cleaning threshold level is lower than the second cleaning threshold level.

[0016] The air conditioner involved in the present application can comprehensively consider the influence of indoor fan speed and indoor air humidity on the generation of condensed water, and determine the drainage level of the drain pump based on both the indoor fan speed and the indoor air humidity. The higher the drainage level, the higher the corresponding drainage speed, so that the speed of the drain pump can be adaptively adjusted according to the amount of condensed water.

[0017] The drainage level obtained is related to the amount of condensed water in the water collection pan. A high drainage level indicates a large amount of condensed water. When the drainage level meets the drainage threshold level, since the drainage level determines the drainage speed, the condensed water in the water collection pan can be discharged in time, thereby improving the drainage efficiency and eliminating the need for the drainage pump to operate at high power for a long time, saving energy consumption.

[0018] When the drainage level meets the first cleaning threshold level, the water tray is cleaned by the cleaner, and when the water level reaches the preset water level, the cleaner is stopped to clean the water tray, and the cleaned sewage is discharged to the outside through the drain port.

[0019] When the drainage level meets the second cleaning threshold level, that is, the amount of condensed water is large at this time, the water pan is cleaned by the cleaner while the water is also drained through the drain port. At this time, the self-cleaning effect is better.

[0020] In some embodiments of the present application, the relationship between the indoor fan speed and the indoor humidity and the drainage level can be established in advance, or this relationship can be pre-stored in a storage unit, which is connected to the main control unit. After the main control unit obtains the indoor fan speed and the indoor air humidity, it obtains the current corresponding drainage level by querying this relationship.

[0021] In some embodiments of the present application, the air conditioner further comprises:

[0022] a tee having a first port, a second port, and a third port connected to each other, wherein the first port is connected to the bypass port, and the second controllable valve is provided on the pipeline between the second port and the cleaner;

[0023] a third controllable valve disposed on the drainage pipeline at the third port, configured to discharge water passing through the bypass port through the third port and the third controllable valve to the outside when the third controllable valve is connected;

[0024] The drainage threshold level includes a first drainage threshold level and a second drainage threshold level;

[0025] When the drainage level meets a first drainage threshold level, the main control unit controls only the first controllable valve to be connected so as to drain water through the drainage port;

[0026] When the drainage level meets the second drainage threshold level, the main control unit only controls the first controllable valve and the third controllable valve to be connected, so as to drain water through the drainage port and the third port;

[0027] The first drainage threshold level, the first cleaning threshold level, the second cleaning threshold level and the second drainage threshold level increase in sequence.

[0028] In this application, the purpose of setting up a tee is to lead out another drain outlet (i.e., the third outlet). When the amount of condensed water is large, double drain outlets are used for drainage to ensure timely drainage and improve drainage efficiency.

[0029] In some embodiments of the present application, the air conditioner further comprises:

[0030] The humidity sensor is arranged indoors and is used to detect the indoor air humidity. The main control unit receives the air humidity detected by the humidity sensor.

[0031] In some embodiments of the present application, the air conditioner further comprises:

[0032] The fan driving unit communicates with the main control unit via the communication unit and is used to drive the indoor fan to start or stop running.

[0033] The communication unit is used to realize a communication loop between the main control unit and the fan drive unit, so that the main control unit can obtain the indoor fan speed (or wind speed). The communication unit can be a UART communication loop.

[0034] In some embodiments of the present application, the water pump drive unit includes:

[0035] The water pump driver chip has a speed feedback pin whose output signal is fed back to the main control unit for real-time detection of the speed of the drainage pump; an overcurrent protection circuit is provided on the periphery of the water pump driver chip for overcurrent protection of the drainage pump motor.

[0036] The water pump driver chip involved in the present application has an overcurrent protection function, and can achieve overcurrent protection for the drainage pump motor by setting an overcurrent protection circuit on the periphery of the overcurrent protection pin.

[0037] The overcurrent protection circuit may include multiple current limiting resistors. By setting different resistance values ​​of the current limiting resistors and setting the current protection limit, overcurrent protection for different motor currents can be achieved.

[0038] In some embodiments of the present application, the air conditioner further comprises:

[0039] a float switch connected to the main control unit and used to detect the water level in the water receiving tray; when the water level in the water receiving tray reaches the preset water level, the float switch sends a detection signal to the main control unit; the main control unit receives the detection signal and stops the indoor fan, disconnects the second controllable valve, and controls the first controllable valve to be connected.

[0040] By setting a float switch and a preset water level, when the drainage pump malfunctions and cannot drain water in time, a detection signal can be sent to the main control unit to stop the indoor fan and avoid further generation of condensed water.

[0041] And it can be switched from cleaning mode to draining mode when docking the water tray.

[0042] In some embodiments of the present application, the air conditioner further comprises:

[0043] An alarm unit is connected to the main control unit and is used to control the alarm unit to issue an alarm prompt when the main control unit receives the detection signal.

[0044] The alarm unit issues an alarm prompt to remind users to drain water in time to avoid safety risks caused by overflow of excessive water in the water tray.

[0045] In some embodiments of the present application, the air conditioner further comprises:

[0046] A valve drive unit is connected to the main control unit and is also electrically connected to the first controllable valve and the second controllable valve. When the main control unit outputs a first control signal, the first controllable valve is driven to be on and off by the valve drive unit. When the main control unit outputs a second control signal, the second controllable valve is driven to be on and off by the valve drive unit.

[0047] In some embodiments of the present application, the valve drive unit includes:

[0048] a valve drive chip having multiple input pins and multiple output pins corresponding to the multiple input pins, wherein the multiple input pins are connected to multiple output terminals of the main control unit, wherein two input pins are used to receive the first control signal and the second control signal;

[0049] Multiple relays, one relay is used to control the on and off of a controllable valve, one end of the relay coil is connected to the power supply, and the other end is connected to the output pin of the corresponding input pin; the normally open switch of the relay is connected in series to the power supply line that provides electrical energy to the controllable valve, and is used to connect the controllable valve when the normally open switch is closed, and disconnect the controllable valve when the normally open switch is disconnected.

[0050] By controlling the power on / off of the relay coil, the power supply circuit of the controllable valve is connected / disconnected, thereby realizing the connection / disconnection of the controllable valve.

[0051] In some embodiments of the present application, a plurality of water outlet holes are provided on the surface of the nozzle of the cleaner, and the water outlet areas of the plurality of water outlet holes are smaller than the cross-sectional area of ​​the bypass pipeline.

[0052] The water outlet area of ​​several circular holes is smaller than the cross-sectional area of ​​the bypass pipe. The water pressure difference is formed at the nozzle to ensure that the water is sprayed out at a certain pressure, so as to clean the dirt on the surface of the docking water pan.

[0053] Other features and advantages of the present invention will become more apparent after reading the detailed description of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0055] Figure 1 A structural block diagram of an air conditioner according to an embodiment of the air conditioner proposed in this application;

[0056] Figure 2The system frame of the air conditioner embodiment proposed in this application Figure 1 ;

[0057] Figure 3 The pin connection of the air conditioner embodiment proposed in this application Figure 1 ;

[0058] Figure 4 A detection principle diagram of a float switch in an air conditioner embodiment according to the present application;

[0059] Figure 5 A control principle diagram of a float switch sending a detection signal in an embodiment of an air conditioner according to the present application;

[0060] Figure 6 A front view of a drainage pump in an embodiment of an air conditioner according to the present application;

[0061] Figure 7 A top view of a drain pump according to an embodiment of the air conditioner proposed in this application;

[0062] Figure 8 Schematic diagram of the drainage pump in the embodiment of the air conditioner proposed in this application when draining water Figure 1 ;

[0063] Figure 9 The system frame of the air conditioner embodiment proposed in this application Figure 2 ;

[0064] Figure 10 Schematic diagram of the drainage pump in the embodiment of the air conditioner proposed in this application Figure 2 ;

[0065] Figure 11 A control principle diagram of a controllable valve in an embodiment of an air conditioner proposed in this application;

[0066] Figure 12 A control principle diagram of a relay in an embodiment of an air conditioner proposed in this application;

[0067] Figure 13 A schematic cross-sectional view of a cleaner according to an embodiment of an air conditioner proposed in the present application;

[0068] Figure 14 This is a flow chart of the operation control of the air conditioner embodiment proposed in this application.

[0069] Reference numerals:

[0070] 100, water tray; 200, drain pump; 210, water inlet; 220, drain outlet; 230, bypass port; 300, cleaner; 400, humidity sensor; 500, main control unit; 600, water pump drive unit; 700, valve drive unit; 700', first controllable valve; 700", second controllable valve; 700'", third controllable valve; 710, valve drive chip; 720, first relay; 730, second relay; 740, third relay; 800, indoor fan; 800', fan drive unit; 800", communication unit; 900, float switch; L1, drain pipe; L2, bypass pipe; L3, drain pipe; 900', tee. DETAILED DESCRIPTION

[0071] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0072] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on this application.

[0073] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0074] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0075] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature therebetween. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0076] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0077] <Basic operating principles of air conditioners>

[0078] An air conditioner performs its refrigeration cycle by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle involves a series of processes involving compression, condensation, expansion, and evaporation to cool or heat the indoor space.

[0079] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0080] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser to a lower-pressure liquid. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves cooling by utilizing the latent heat of evaporation to exchange heat with the material being cooled. Throughout this cycle, the air conditioner regulates the temperature of the indoor space.

[0081] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0082] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0083] The drain pump 200 is a component of the air conditioner indoor unit. In the cooling mode of the air conditioner, condensed water will be generated on the surface of the indoor heat exchanger serving as the evaporator when the air flow passes through it. Generally, a water receiving pan 100 for receiving the condensed water is arranged under the indoor heat exchanger. The drain pump 200 is installed in the water receiving pan 100 and is used to draw the condensed water in the water receiving pan 100 out to the outside of the air conditioner indoor unit when the drain pump 200 is started.

[0084] Impurities such as lint and hair may accumulate in the water receiving tray 100 for a long time. When the drain pump 200 drains water, the impurities in the water receiving tray 100 may enter the drain pump 200, causing a risk of the drain pump 200 becoming dirty and clogged.

[0085] Therefore, in order to solve the problem that the drain pump 200 in the existing air conditioner operates at a fixed speed and maximum power when starting, and the dirt and sediment inside the water receiving pan 100 causes the drain pump 200 to be dirty and blocked, the present application provides an air conditioner that can adaptively adjust the speed of the drain pump 200 according to the amount of condensed water, thereby improving the drainage efficiency and achieving energy saving effects, and using the condensed water in the water receiving pan 100 to clean the water receiving pan 100, avoiding the accumulation of impurities and reducing the risk of dirt and blockage of the drain pump 200.

[0086] The air conditioner includes a water receiving tray 100 , a drain pump 200 , a cleaner 300 , a first controllable valve 700 ′, a second controllable valve 700 ″, a water pump driving unit 600 and a main control unit 500 .

[0087] The water receiving tray 100 is located in the indoor unit of the air conditioner and is used to receive condensed water generated when the air flow passes through the low-temperature indoor heat exchanger surface during the cooling operation of the air conditioner.

[0088] See also Figure 6 and Figure 7 The drain pump 200 has a water inlet 210, a drain outlet 220 and a bypass port 230, wherein the drain outlet 220 and the bypass port 230 are both connected to the water inlet 210 and are both used to drain the water in the water receiving tray 100, but the discharge directions are different.

[0089] The drain pump 200 is installed in the water receiving tray 100 , for example, installed upside down in the water receiving tray 100 , so that the water inlet 210 of the drain pump 200 faces the water receiving tray 100 , for example, contacts the condensed water in the water receiving tray 100 .

[0090] When the drain pump 200 is working, the water inlet 210 of the drain pump 200 can extract the condensed water collected in the water tray 100 .

[0091] See also Figure 1 The cleaner 300 is installed in the water receiving tray 100. The cleaner 300 has a nozzle and is configured to spray a pressurized water flow, and the water receiving tray 100 is cleaned by the sprayed pressurized water flow.

[0092] See also Figure 8 and Figure 10 The first controllable valve 700 ′ is provided at the drainage pipe L1 of the drainage port 220 , and is used to discharge the condensed water in the water receiving tray 100 to the outside when the main control unit 500 controls the first controllable valve 700 ′ to be connected.

[0093] The second controllable valve 700″ is arranged on the bypass pipe L2 between the bypass port 230 and the cleaner 300, and is used to draw the condensed water in the water receiving tray 100 into the cleaner 300 when the main control unit 500 controls the second controllable valve 700″ to be connected, and is used to spray the condensed water into the water receiving tray 100 through the nozzle of the cleaner 300 to clean the water receiving tray 100.

[0094] By providing the drainage pipe L1 and the bypass pipe L2, the transmission distance of the water flow is extended.

[0095] The provision of the drainage pipe L1 makes the drainage path no longer fixed, and the drainage is no longer discharged directly from the drainage port 220, but its length can be determined according to the distance between the appropriate drainage position and the air conditioner.

[0096] The extension of the water flow distance in the bypass pipe L2 ensures that the condensed water can be sufficiently pressurized to clean the docking water tray 100. When the length of the bypass pipe L2 is sufficient, the cleaner 300 can reach any position of the water tray 100. The user can perform targeted cleaning according to the degree of dirtiness of each position in the water tray 100, thereby improving cleaning efficiency and effectiveness.

[0097] See also Figure 2 、 Figure 3 and Figure 9 The water pump driving unit 600 is connected to the main control unit 500 and is used to receive the PWM pulse driving signal sent by the main control unit 500, and control the operation of the drainage pump 200 based on the PWM pulse driving signal.

[0098] The larger the duty cycle of the PWM pulse driving signal, the faster the drain pump 200 runs, and thus the faster the drainage speed; the smaller the duty cycle of the PWM pulse driving signal, the slower the drain pump 200 runs, and thus the slower the drainage speed.

[0099] In some embodiments of the present application, the speed of the indoor fan 800 and the indoor air humidity, which affect the amount of condensed water, are used to determine the amount of condensed water. When the amount of condensed water is large, the speed of the drain pump 200 should be faster, and when the amount of condensed water is small, the speed of the drain pump 200 should be slower. In this way, the speed of the drain pump 200 is adaptively adjusted to save energy.

[0100] In the cooling mode of the air conditioner, the higher the indoor air humidity, the higher the speed of the indoor fan 800, the faster the condensation water is produced, and the greater the amount of condensation water produced, and vice versa.

[0101] Therefore, in some embodiments of the present application, a relationship is established between the rotation speed (or gear) of the indoor fan 800 and the indoor air humidity and the drainage level.

[0102] The speed of the indoor fan 800 corresponds to the gear position. When the gear position is high, the corresponding speed is high, and when the gear position is low, the corresponding speed is low.

[0103] The higher the gear of the indoor fan 800 and the greater the indoor air humidity, the higher the drainage level; the lower the gear of the indoor fan 800 and the lower the indoor air humidity, the lower the drainage level; at the same gear of the indoor fan 800, the greater the indoor air humidity, the higher the drainage level; at the same indoor air humidity, the larger the gear of the indoor fan 800, the higher the drainage level.

[0104] Based on this principle, the relationship between the indoor fan 800 gear and the indoor air humidity and the drainage level is preset.

[0105] This relationship can be pre-written in a preset data table, or pre-written as multiple commands, where each command describes the relationship between the indoor air humidity and the indoor fan speed and the drainage level.

[0106] The number of indoor fan 800 gears and the number of indoor air humidity settings can be set as needed.

[0107] In some embodiments of the present application, a common six-speed indoor fan 800 will be used as an example to illustrate that the speed of the indoor fan 800 is set to speed one to speed six, and the indoor air humidity is divided into nine humidity levels: 10% to 90%, with a difference of 10% between each two adjacent humidity levels.

[0108] In this way, 54 corresponding situations can be formed under different combinations of the indoor fan 800 gear and indoor air humidity.

[0109] The drainage level of the drainage pump 200 is divided into 14 drainage levels: LV1 to LV14. The difference between two adjacent drainage levels is one drainage level. The higher the drainage level, the faster the operation speed of the drainage pump 200.

[0110] The drainage grade, condensed water volume and drainage speed are in one-to-one correspondence, that is, the more condensed water volume and the higher the drainage grade, the faster the drainage speed.

[0111] In this way, a preset data table is established based on the above preset indoor fan 800 gear, indoor air humidity and drainage level.

[0112] The content of the preset data table can be seen in Table 1 below.

[0113]

[0114] The preset data table as described above may be stored in a storage unit (not shown) connected to the main control unit 500 .

[0115] When in use, the main control unit 500 calls the data table from the storage unit and queries the data table according to the gear position of the indoor fan 800 and the indoor air humidity to determine the drainage level.

[0116] The drainage level is determined for different indoor fan speeds and different indoor air humidity.

[0117] Based on different drainage levels, the main control unit 500 inputs different PWM pulse driving signals to the water pump driving unit 600, thereby controlling the drainage pump 200 to operate at a rotation speed corresponding to the drainage level.

[0118] In some embodiments of the present application, a relationship table corresponding to the drainage level and the duty cycle of the PWM pulse drive signal may be preset.

[0119] As mentioned above, there are fourteen drainage levels, and correspondingly, there are fourteen duty cycles of the PWM pulse driving signal: DUTY1 to DUTY14.

[0120] The drainage levels LV1 to LV14 correspond to the duty cycles DUTY1 to DUTY14 respectively, and the duty cycles of DUTY1 to DUTY14 increase sequentially.

[0121] The relationship table mentioned above is shown in Table 2 below.

[0122] Drainage grade LV1 Level 2 Level 3 Level 4 Level 5 Level 6 LV7 Duty cycle DUTY1 DUTY2 DUTY3 DUTY4 DUTY5 DUTY6 DUTY7 Drainage grade Level 8 LV9 LV10 LV11 LV12 LV13 LV14 Duty cycle DUTY8 DUTY9 DUTY10 DUTY11 DUTY12 DUTY13 DUTY14

[0123] In some embodiments of the present application, the relationship table described above may also be stored in a storage unit.

[0124] When in use, the main control unit 500 calls the relationship table from the storage unit and determines the duty cycle of the corresponding PWM pulse driving signal according to the determined drainage level.

[0125] In some examples of this application, see Figure 2 、 Figure 3 and Figure 9 The air conditioner further includes a humidity sensor 400, which is arranged indoors to detect the indoor air humidity.

[0126] The humidity sensor 400 is connected to the main control unit 500 and is used to transmit the indoor air humidity detected by the humidity sensor 400 to the main control unit 500 .

[0127] In some examples of this application, see Figure 3 The main control unit 500 uses an integrated MCU chip, which has a first input pin for receiving the indoor air humidity fed back by the humidity sensor 400 .

[0128] In some embodiments of this application, see Figure 2 The main control unit 500 is connected to the fan driving unit 800' via the communication unit 800", and the fan driving unit 800' outputs a driving signal to the indoor fan 800 to start or stop the indoor fan 800.

[0129] The communication unit 800" may use a UART communication circuit.

[0130] When the indoor fan 800 is running, the main control unit 500 can obtain the gear position of the indoor fan 800 through the communication unit 800 ″.

[0131] The MCU chip also has a first output pin, which is used to determine the duty cycle of the PWM pulse signal to be output after the MCU chip obtains the gear position of the indoor fan 800 and the indoor air humidity by looking up Table 1 and Table 2 as described above, and output the PWM pulse signal to the water pump drive unit 600 at the first output pin, see Figure 2 .

[0132] See also Figure 3 The water pump driving unit 600 includes a water pump driving chip having a PWM pin, which is used to receive a PWM pulse signal output by a first output pin of the MCU chip.

[0133] The water pump driver chip also has an overcurrent protection function, which implements current limiting protection for the drainage pump 200 motor by setting an overcurrent protection circuit on its periphery.

[0134] In some examples of this application, see Figure 3 The water pump driving chip has a first pin, a second pin and a third pin, and the overcurrent protection circuit is arranged between the first pin, the second pin and the third pin.

[0135] The overcurrent protection circuit includes a first resistor R1, a second resistor R2 and a third resistor R3.

[0136] The first pin is grounded through a first resistor R1 , the second pin is grounded through a second resistor R2 , and the third pin is connected to a connection point where the second pin and the second resistor R2 are connected through a third resistor R3 .

[0137] The overcurrent protection limit of the motor of the drainage pump 200 can be set by setting the values ​​of each resistor, and different overcurrent protection limit values ​​can be set by changing the values ​​of each resistor.

[0138] See also Figure 3 The water pump driver chip also has a speed feedback pin, and the MCU chip has a third input pin.

[0139] The speed feedback pin is connected to the third input pin, and is used by the main control unit 500 to detect the speed of the drainage pump 200 in real time and perform closed-loop control on the speed to achieve stable and controllable speed.

[0140] In some embodiments of the present application, after the main control unit 500 obtains the drainage level, in addition to determining the speed of the drainage pump 200 according to the drainage level, the first controllable valve 700 ′ and the second controllable valve 700 ″ are also controlled to be on and off according to the drainage level to determine the drainage direction.

[0141] See also Figure 8 and Figure 10 In the drainage mode, that is, when the drainage level meets the drainage threshold level, the main control unit 500 controls the first controllable valve 700 ′ to connect the drainage port 220 and the drainage line L1 so that the condensed water is discharged to the outside.

[0142] The drain threshold level is preset and is only used for draining water in this mode without cleaning the water tray 100 .

[0143] This mode is applicable to low or high drainage levels. When the drainage level is low (for example, drainage level LV1 to LV4), the amount of condensed water generated is small and it does not have self-cleaning capabilities. When the drainage level is high (for example, drainage level LV11 to LV14), the amount of condensed water generated is the largest and there is a risk of overflow. Therefore, the drainage mode is entered directly.

[0144] In the first self-cleaning mode, that is, when the drainage level meets the first cleaning threshold level, the main control unit 500 controls the second controllable valve 700″ to be connected. At this time, the first controllable valve 700′ is disconnected, so that the bypass port 230 and the cleaner 300 are connected, so that the condensed water flows to the cleaner 300 through the bypass port 230, the second controllable valve 700″ and the bypass line L2, and then the pressurized water flow sprayed by the cleaner 300 is connected to the water pan 100 for self-cleaning.

[0145] Since the water after self-cleaning is still in the water receiving pan 100, the water level in the water receiving pan 100 gradually increases over time. When the water level reaches the preset water level, the second controllable valve 700" is disconnected and the first controllable valve 700' is controlled to be connected. In this way, the first self-cleaning mode ends and the water in the water receiving pan 100 enters the drainage mode. The water in the water receiving pan 100 is discharged to the outside through the drain port 220, the first controllable valve 700' and the drainage pipe L1, thereby preventing re-contamination caused by the condensed water remaining in the water receiving pan 100 for a long time after cleaning.

[0146] The first cleaning threshold level is preset, and may be a threshold level or a threshold level range. In this mode, the water tray 100 is first self-cleaned and then drained.

[0147] For example, the first cleaning threshold level may be selected as drainage level LV5 to LV7.

[0148] In the second self-cleaning mode, that is, when the drainage level meets the second cleaning threshold level, the main control unit 500 controls the first controllable valve 700′ and the second controllable valve 700″ to be connected, so that a part of the condensed water in the water receiving tray 100 flows through the bypass port 230, the second controllable valve 700″ and the bypass pipe L2 to the cleaner 300 to clean the water receiving tray 100, and at the same time, a part of the condensed water is discharged to the outside through the drain port 220, the first controllable valve 700′ and the drain pipe L1, thereby realizing the use of high condensed water volume for self-cleaning and drainage at the same time. The self-cleaning effect in this mode is better than that in the first self-cleaning mode.

[0149] The second cleaning threshold level is preset and can be a threshold level or a threshold level range. In this mode, the water tray 100 is self-cleaned and drained simultaneously, and the second cleaning threshold level is higher than the first cleaning threshold level.

[0150] For example, the second cleaning threshold level may be selected as a drainage level of LV8 to LV10.

[0151] Through the above design, the user can realize self-cleaning of the water tray 100 when using the air conditioner, ensuring the cleanliness of the water tray 100 for a long time, thereby reducing the efficiency of dirt blockage of the drainage pump 200 and improving the air quality when the indoor unit is outgoing air. The cleaning water comes from the condensed water generated by the operation of the air conditioner, which not only achieves decontamination but also realizes full utilization of water resources.

[0152] See also Figure 9 and Figure 10 In order to improve the drainage efficiency when the drainage level is high, some embodiments of the present application also set a single drainage mode and a double drainage mode for the drainage mode.

[0153] To this end, the air conditioner is provided with a tee 900' having a first port, a second port, and a third port communicating with each other.

[0154] The tee 900 ′ is provided at the bypass port 230 for changing the direction of the condensed water drawn out from the bypass port 230 .

[0155] The first port is connected to the bypass port 230 , the second port is connected to the cleaner 300 via the bypass line L2 , the second controllable valve 700 ″ is disposed on the bypass line L2 , and the third port is connected to another drainage line L3 .

[0156] A third controllable valve 700 ′″ is provided on the other drainage pipeline L3 , and its on / off is also controlled by the main control unit 500 .

[0157] The drainage threshold level as described above includes a first drainage threshold level and a second drainage threshold level, and the first drainage threshold level is lower than the second drainage threshold level.

[0158] Correspondingly, the drainage mode includes a first drainage mode and a second drainage mode. The first drainage threshold level corresponds to the first drainage mode, and the second drainage threshold level corresponds to the second drainage mode.

[0159] In the first drainage mode, that is, when the drainage level meets the first drainage threshold level, the main control unit 500 controls the first controllable valve 700′ to be connected. At this time, the second controllable valve 700″ and the third controllable valve 700″′ are both disconnected. The first controllable valve 700′ connects the drain port 220 and the drainage pipeline L1, so that the condensed water is discharged to the outside through the single drain port 220.

[0160] The first drainage threshold level is preset and can be a threshold level or a threshold level range. In this mode, a single drainage outlet (ie, drainage outlet 220 ) is sampled for drainage.

[0161] For example, the first drainage threshold level may be selected as drainage levels LV1 to LV4.

[0162] In the second drainage mode, that is, when the drainage level meets the second drainage threshold level, the main control unit 500 controls the first controllable valve 700′ and the third controllable valve 700″′ to be connected. At this time, the second controllable valve 700″ is disconnected, the first controllable valve 700′ is connected to the drain port 220 and the drain pipe L1, and the third controllable valve 700″′ is connected to the bypass port 230 and another drain pipe L3, so that the condensed water is discharged to the outside through the dual drain ports (that is, the drain port 220 and the bypass port 230).

[0163] The second drainage threshold level is preset and can be a threshold level or a threshold level range. In this mode, dual drain outlets are sampled for drainage.

[0164] For example, the second drainage threshold level may be selected as drainage level LV11 to LV14.

[0165] Double drain outlets are used for drainage in case of high condensate volume to ensure timely drainage and avoid alarm and shutdown due to water overflow.

[0166] The drainage level is obtained cyclically at preset intervals, so that it can be determined whether it is in one of the first drainage mode, the second drainage mode, the first self-cleaning mode and the second self-cleaning mode, ensuring timely drainage, improving drainage efficiency, and timely self-cleaning of the water tray 100 to avoid impurities settling in the water tray 100 for a long time and causing the drainage pump 200 to become dirty and blocked, making it impossible to drain water smoothly.

[0167] In order to avoid the problem of excessive condensed water in the water receiving tray 100 overflowing and causing safety hazards when the drain pump 200 fails, in some embodiments of the present application, see Figures 3 to 5 The air conditioner further includes a float switch 900 .

[0168] The float switch 900 is disposed in the water receiving tray 100 for detecting the water level of the condensed water in the water receiving tray 100 , and a preset water level is preset inside the float switch 900 , which is the maximum water level in the water receiving tray 100 .

[0169] When the water level in the water receiving tray 100 reaches a preset water level, the float switch 900 is activated and sends a detection signal, and the detection signal is transmitted to the main control unit 500 .

[0170] Generally, the float switch 900 is in a normally closed state. Once the water level in the water receiving tray 100 reaches a preset water level, the float switch 900 is disconnected, that is, in an open state. Therefore, the opening and closing state information of the float switch 900 includes a closed state and an open state.

[0171] In some embodiments of this application, see Figure 4 , the power supply +5V is connected to the input end of the voltage divider circuit (not shown) through the float switch 900, that is, one end of the float switch 900 is connected to +5V and the other end is connected to the input end of the voltage divider circuit.

[0172] For example, the voltage divider circuit may include a first resistor, a second resistor and a third resistor, one end of the first resistor is respectively connected to the other end of the float switch 900 and one end of the second resistor, the other end of the first resistor is grounded, the other end of the second resistor is respectively connected to the second input pin of the MCU chip and one end of the third resistor, and the other end of the third resistor is grounded.

[0173] Therefore, see Figure 3 and Figure 5When the float switch 900 is normally closed because the water level has not reached the preset water level, the second input pin of the MCU chip receives a high-level detection signal, and when the float switch 900 is disconnected because the water level has reached the preset water level, the second input pin of the MCU chip receives a low-level detection signal.

[0174] After receiving the detection signal, the MCU chip outputs a control signal to the fan driving unit 800 ′ to start or stop the indoor fan 800 .

[0175] That is, when the MCU chip receives a high-level detection signal, it outputs a control signal to the fan drive unit 800′ to operate the indoor fan 800; when the MCU chip receives a low-level detection signal, it outputs a control signal to the fan drive unit 800′ to stop the indoor fan 800, thereby preventing the indoor fan 800 from continuing to operate and continue to produce condensed water.

[0176] As described above, when the float switch 900 is disconnected, it indicates that the water level in the water receiving tray 100 has reached the preset water level. This situation indicates that the drainage of the drainage pump 200 is abnormal. Therefore, manual drainage should be carried out in a timely manner.

[0177] In order to remind people to drain the water in time, the air conditioner also includes an alarm unit (not shown), which is used to control the alarm unit to issue an alarm prompt when the main control unit 500 receives a low-level detection signal, so as to intuitively remind users to drain the water in time.

[0178] In the first self-cleaning mode described above, while the docking water tray 100 is self-cleaning, when the main control unit 500 receives a low-level detection signal fed back by the float switch 900, the main control unit 500 will disconnect the second controllable valve 700" and connect the first controllable valve 700', thereby achieving timely drainage and preventing condensed water from overflowing.

[0179] The controllable valve mentioned above may be a solenoid valve, a piezoelectric valve, a MEMS (Micro-Electro-Mechanical System) valve, an angle seat valve or other valves that can be controlled to open, connect or close.

[0180] In some embodiments of the present application, the first controllable valve 700 ′, the second controllable valve 700 ″, and the third controllable valve 700 ′″ may all be solenoid valves.

[0181] In some examples of this application, see Figure 9 The valve driving unit 700 drives the first controllable valve 700 ′, the second controllable valve 700 ″ and the third controllable valve 700 ′″ to be turned on and off.

[0182] The main control unit 500 outputs a control signal based on the determined drainage level. Based on the control signal, the valve driving unit 700 operates to drive the controllable valve to open or close in response to the control signal.

[0183] In some embodiments of the present application, the valve driving unit 700 has multiple input terminals and multiple output terminals corresponding to the multiple input terminals.

[0184] In some embodiments of the present application, the multiple input terminals are three input terminals, which are respectively used to receive three control signals from the main control unit 500300, namely the first control signal, the second control signal and the third control signal.

[0185] When the main control unit 500300 adopts an MCU chip, the MCU chip outputs a first control signal at a first control pin, outputs a second control signal at a second control pin, and outputs a third control signal at a third control pin.

[0186] When the valve drive unit 700 receives the first control signal, the corresponding output end controls the first controllable valve 700′ to be on or off; when the valve drive unit 700 receives the second control signal, the corresponding output end controls the second controllable valve 700″ to be on or off; when the valve drive unit 700 receives the third control signal, the corresponding output end controls the third controllable valve 700′″ to be on or off.

[0187] In some examples of this application, see Figure 12 , the valve driving unit 700 includes a valve driving chip 710 and a plurality of relays.

[0188] When the main control unit 500300 adopts an MCU chip, the MCU chip outputs a first control signal at a first control pin, outputs a second control signal at a second control pin, and outputs a third control signal at a third control pin.

[0189] In some examples of this application, see Figure 11 , using three input terminals (denoted as the first input terminal, the second input terminal and the third input terminal) and the corresponding three output terminals (denoted as the first output terminal, the second output terminal and the third output terminal) of the valve driving chip 710.

[0190] The number of the plurality of relays is equal to the number of controllable valves.

[0191] In some embodiments of the present application, three relays are used, which are denoted as the first relay 720, the second relay 730 and the third relay 740. The first relay 720, the second relay 730 and the third relay 740 correspond to the first output end, the second output end and the third output end of the valve drive chip 710 respectively.

[0192] The first input terminal, the second input terminal and the third input terminal of the valve driving chip 710 are connected to the first control pin, the second control pin and the third control pin of the MCU chip respectively.

[0193] See also Figure 11 and Figure 12 The first input end of the valve driving chip 710 is connected to the first control pin of the MCU chip, the first output end is connected to one end of the coil of the first relay 720, and the power supply V is connected to the other end of the coil of the first relay 720.

[0194] The normally open switch of the first relay 720 is connected in series to the power supply line of the first controllable valve 700 ′.

[0195] When the first control signal drives the first output terminal to output a low level, the coil of the first relay 720 is energized and the normally open switch is closed, thereby connecting the power supply line to normally supply power to the first controllable valve 700 ′. At this time, the first controllable valve 700 ′ is opened and connected.

[0196] When the first control signal drives the first output terminal to output a high level, the coil of the first relay 720 loses power and the normally open switch is disconnected, thereby disconnecting the power supply line and preventing power from being supplied to the first controllable valve 700 ′. At this time, the first controllable valve 700 ′ is closed and disconnected.

[0197] The second input end of the valve driving chip 710 is connected to the second control pin of the MCU chip, the second output end is connected to one end of the coil of the second relay 730 , and the power supply V is connected to the other end of the coil of the second relay 730 .

[0198] The normally open switch of the second relay 730 is connected in series to the power supply line of the second controllable valve 700 ″.

[0199] When the second control signal drives the second output terminal to output a low level, the coil of the second relay 730 is energized and the normally open switch is closed, thereby connecting the power supply line to normally supply power to the second controllable valve 700″. At this time, the second controllable valve 700″ is opened and connected.

[0200] When the second control signal drives the second output terminal to output a high level, the coil of the second relay 730 loses power and the normally open switch is disconnected, thereby disconnecting the power supply line and preventing power from being supplied to the second controllable valve 700″. At this time, the second controllable valve 700″ is closed and disconnected.

[0201] The third input terminal of the valve driving chip 710 is connected to the third control pin of the MCU chip, the third output terminal is connected to one end of the coil of the third relay 740 , and the power supply V is connected to the other end of the coil of the third relay 740 .

[0202] The normally open switch of the third relay 740 is connected in series to the power supply line of the third controllable valve 700''.

[0203] When the third control signal drives the third output terminal to output a low level, the coil of the third relay 740 is energized and the normally open switch is closed, thereby connecting the power supply line to normally supply power to the third controllable valve 700'. At this time, the third controllable valve 700' is opened and connected.

[0204] When the third control signal drives the third output terminal to output a high level, the coil of the third relay 740 loses power and the normally open switch is disconnected, thereby disconnecting the power supply line and preventing the third controllable valve 700'' from being powered. At this time, the third controllable valve 700'' is closed and disconnected.

[0205] In some examples of this application, see Figure 13 , shows a schematic diagram of a cleaner 300 provided in an embodiment of the present application.

[0206] See also Figure 10 and Figure 13 The cleaner 300 has a nozzle, and a plurality of water outlet holes are provided on the surface of the nozzle. The total water outlet area of ​​the plurality of water outlet holes is smaller than the cross-sectional area of ​​the bypass pipe L2. In this way, the water flow emitted from the water outlet holes is ensured to have a certain pressure, which is conducive to forming a water pressure difference at the water outlet holes of the cleaner 300, and can more effectively clean the impurities deposited on the surface of the water tray 100.

[0207] See also Figure 14 ,The whole operation process of the air conditioner can be described as follows.

[0208] The user controls the air conditioner indoor unit to operate in cooling mode and sets the indoor fan 800 to start running at a certain gear, at which time the air conditioner begins to generate condensed water.

[0209] After the air conditioner has been running for a period of time, the humidity sensor 400 detects the current indoor air humidity and transmits it to the main control unit 500. The main control unit 500 determines the drainage level by looking up Table 1 based on the current feedback indoor air humidity and the gear position of the indoor fan 800.

[0210] Then, the following two operations are performed simultaneously: (1) by looking up Table 2, a PWM pulse drive signal corresponding to the determined drainage level is output to the water pump drive unit 600, so that the drainage pump 200 runs at a speed corresponding to the drainage level; (2) according to the determined drainage level, the first drainage mode, the second drainage mode, the first self-cleaning mode or the second self-cleaning mode is determined.

[0211] When the drainage level is LV1 to LV4, the first drainage mode is entered, and the main control unit 500 only controls the first controllable valve 700 ′ to be connected, and the second controllable valve 700 ″ and the third controllable valve 700 ′″ are both disconnected. At this time, the condensed water is discharged through the drain port 220.

[0212] When the drainage level is LV5 to LV7, the first self-cleaning mode is entered, and the main control unit 500 controls the second controllable valve 700″ to be connected. At this time, the first controllable valve 700′ and the third controllable valve 700′′ are both disconnected, and the condensed water is circulated and cleaned to the water pan 100 through the bypass port 230, the second port, the bypass pipe L2 and the cleaner 300 until the water level reaches the preset water level and the float switch 900 is disconnected to alarm.

[0213] Upon receiving the alarm signal, the main control unit 500 enters the first drainage mode, disconnects the second controllable valve 700 ″, connects the first controllable valve 700 ′, and discharges the sewage through the drain port 220 , repeating this cycle at preset time intervals.

[0214] When the drainage level is LV8 to LV10, the second self-cleaning mode is entered, the main control unit 500 controls the first controllable valve 700′ and the second controllable valve 700″ to be connected, and the third controllable valve 700″′ is disconnected. The condensed water is self-cleaned by the water receiving tray 100 through the bypass pipe L2 and the cleaner 300, and the sewage is discharged through the drain outlet 220.

[0215] When the drainage level is LV11 to LV14, the amount of condensed water generated is the largest, and there is a risk of overflow, and the second drainage mode is entered. The main control unit 500 controls the first controllable valve 700' and the third controllable valve 700"' to be connected. At this time, the second controllable valve 700" is disconnected, and the condensed water is discharged through the drain port 220 and the drainage pipe L1. At the same time, it is also discharged through the bypass port 230, the second port and the drainage pipe L3.

[0216] The above control process is carried out continuously during the operation of the air conditioner. The main control unit 500 reads data from the humidity sensor 400 at a detection rate at a preset time interval, and controls the speed of the drainage pump 200 at a control rate at a preset time interval, ensuring that the drainage pump 200 motor follows the gear position of the indoor fan 800 and the air humidity to perform real-time closed-loop speed adjustment to achieve the purpose of energy-saving control.

[0217] Furthermore, the air conditioner of the present application can timely conduct self-cleaning of the water tray 100, thereby preventing impurities from settling in the water tray 100 for a long time and causing the drainage pump 200 to become dirty and clogged, thereby preventing smooth drainage.

[0218] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0219] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An air conditioner, comprising: a water receiving tray for receiving condensed water generated when the air conditioner is in operation; a drain pump installed in the water receiving pan, the drain pump comprising a water inlet, a drain outlet and a bypass port respectively connected to the water inlet, the water inlet being connected to the water receiving pan, the drain outlet being used to discharge condensed water in the water receiving pan to the outside; a cleaner installed in the water receiving tray, the cleaner being configured to spray pressurized water to clean the water receiving tray, the cleaner being connected to the bypass port through a bypass pipe; a first controllable valve, which is arranged on the drainage pipe at the drainage outlet; a second controllable valve, which is provided on the bypass pipeline between the bypass port and the cleaner; A water pump driving unit, which is used to drive the drainage pump to operate; a main control unit, which obtains a drainage level of the drainage pump based on both the speed of the indoor fan and the indoor humidity, controls the output of different drive signals to the water pump drive unit, and is used to drive the drainage pump to operate at a speed corresponding to the drainage level. At the same time, it also controls the opening and closing of the first controllable valve and the second controllable valve based on the drainage level, so that when the drainage level meets a drainage threshold level, the first controllable valve is controlled to be connected to drain water through the drain port; when a first cleaning threshold level is met, the second controllable valve is controlled to be connected to clean the water receiving pan using the cleaner; when the water level reaches a preset water level, the second controllable valve is disconnected and the first controllable valve is controlled to be connected; when the second cleaning threshold level is met, the first controllable valve and the second controllable valve are controlled to be connected to clean the water receiving pan using the cleaner while draining water through the drain port; The first cleaning threshold level is lower than the second cleaning threshold level.

2. The air conditioner according to claim 1, characterized in that Also includes: a tee having a first port, a second port, and a third port connected to each other, wherein the first port is connected to the bypass port, and the second controllable valve is provided on the bypass line between the second port and the cleaner; a third controllable valve disposed on the drainage pipeline at the third port, configured to discharge water passing through the bypass port through the third port and the third controllable valve to the outside when the third controllable valve is connected; The drainage threshold level includes a first drainage threshold level and a second drainage threshold level; When the drainage level meets a first drainage threshold level, the main control unit controls only the first controllable valve to be connected so as to drain water through the drainage port; When the drainage level meets the second drainage threshold level, the main control unit only controls the first controllable valve and the third controllable valve to be connected, so as to drain water through the drainage port and the third port; The first drainage threshold level, the first cleaning threshold level, the second cleaning threshold level and the second drainage threshold level increase in sequence.

3. The air conditioner according to claim 1, characterized in that Also includes: The humidity sensor is arranged indoors and is used to detect the indoor air humidity. The main control unit receives the air humidity detected by the humidity sensor.

4. The air conditioner according to claim 1, wherein: Also includes: The fan driving unit communicates with the main control unit via the communication unit and is used to drive the indoor fan to start or stop running.

5. The air conditioner according to claim 1, characterized in that The water pump drive unit comprises: The water pump driver chip has a speed feedback pin whose output signal is fed back to the main control unit for real-time detection of the speed of the drainage pump; an overcurrent protection circuit is provided on the periphery of the water pump driver chip for overcurrent protection of the drainage pump motor.

6. The air conditioner according to claim 1, characterized in that The air conditioner further comprises: a float switch connected to the main control unit and used to detect the water level in the water receiving tray; when the water level in the water receiving tray reaches the preset water level, the float switch sends a detection signal to the main control unit; the main control unit receives the detection signal and stops the indoor fan, disconnects the second controllable valve, and controls the first controllable valve to be connected.

7. The air conditioner according to claim 6, characterized in that The air conditioner further comprises: An alarm unit is connected to the main control unit and is used to control the alarm unit to issue an alarm prompt when the main control unit receives the detection signal.

8. The air conditioner according to claim 1, wherein: The air conditioner further comprises: A valve drive unit is connected to the main control unit and is also electrically connected to the first controllable valve and the second controllable valve. When the main control unit outputs a first control signal, the first controllable valve is driven to be on and off by the valve drive unit. When the main control unit outputs a second control signal, the second controllable valve is driven to be on and off by the valve drive unit.

9. The air conditioner according to claim 8, characterized in that: The valve drive unit comprises: a valve drive chip having multiple input pins and multiple output pins corresponding to the multiple input pins, wherein the multiple input pins are connected to multiple output terminals of the main control unit, wherein two input pins are used to receive the first control signal and the second control signal; Multiple relays, one relay is used to control the on and off of a controllable valve, one end of the relay coil is connected to the power supply, and the other end is connected to the output pin of the corresponding input pin; the normally open switch of the relay is connected in series to the power supply line that provides electrical energy to the controllable valve, and is used to connect the controllable valve when the normally open switch is closed, and disconnect the controllable valve when the normally open switch is disconnected.

10. The air conditioner according to claim 1, wherein A plurality of water outlet holes are provided on the surface of the nozzle of the cleaner, and the water outlet areas of the plurality of water outlet holes are smaller than the cross-sectional area of ​​the bypass pipeline.

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