Air conditioner

Abstract

An indoor heat exchanger in the air conditioner comprises a condensate water heat exchanger and a refrigerant heat exchanger which can exchange heat with each other; the drainage pump is further provided with a water inlet, a drainage port and a bypass port. The bypass port introduces condensate water into an inlet of the condensate water heat exchanger. The air conditioner further comprises a first valve, a second valve and a main control unit, and when the air conditioner is in refrigeration operation and the water level in the water pan reaches the first water level and does not reach the second water level, whether the water inlet temperature of the water inlet of the condensate water heat exchanger reaches the preset temperature lower limit value or not and whether the indoor return air temperature difference reaches the preset temperature difference lower limit value or not are judged; otherwise, the outdoor unit is kept working, the first valve and the second valve are controlled to be communicated, and the drainage pump is controlled to be operated. By dividing the indoor heat exchanger, the cooling capacity of the condensate water is reasonably utilized, the energy consumption of the system is reduced, the condensate water participates in circulation, and the comfort of a user is improved.

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 the related art, the air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0003] When the air conditioner is in cooling mode, the indoor heat exchanger acts as an evaporator and the outdoor heat exchanger acts as a condenser. When the water vapor in the air meets the low-temperature evaporator, low-temperature condensed water is formed and flows into the water collection pan of the indoor unit. The low-temperature condensed water is discharged from the water collection pan to the outside through a drain pipe using a drainage pump, resulting in a waste of cold water in the low-temperature condensed water.

[0004] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] In response to the problems pointed out in the background technology, the present application provides an air conditioner, which divides the indoor heat exchanger into a condensate heat exchanger and a refrigerant heat exchanger. When the indoor temperature reaches a set state, only the low-temperature condensate in the water receiving pan is introduced into the condensate heat exchanger to participate in heat exchange, thereby reducing the refrigeration energy consumption; when the indoor temperature does not reach the set state, the refrigerant heat exchanger participates in the refrigeration cycle and the condensate heat exchanger circulates through the low-temperature condensate for heat exchange, thereby improving the utilization of the condensate cooling capacity and reducing the system refrigeration energy consumption; and the participation of the condensate in the circulation improves the user's comfort experience.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: The present application relates to an air conditioner, comprising: an indoor unit including an indoor heat exchanger; The outdoor unit has an outdoor heat exchanger, the indoor heat exchanger is one of the evaporator and the condenser, and the outdoor heat exchanger is the other; A water receiving tray is placed in the indoor unit and is used to receive condensed water generated when the air flows through the indoor heat exchanger during cooling operation of the air conditioner; a drain pump installed in the water receiving tray and having a water inlet and a drain outlet, wherein the water inlet is communicated with the water receiving tray, and the drain outlet is used to discharge condensed water in the water receiving tray to the outside; The indoor heat exchanger includes a condensed water heat exchanger and a refrigerant heat exchanger capable of heat exchange with each other, and the refrigerant is refrigerated through a compressor, an outdoor heat exchanger, a throttling element and a refrigerant heat exchanger in an outdoor unit. The drain pump also has a bypass port connected to the water inlet for introducing condensed water into the inlet of the condensed water heat exchanger, and the discharge port of the condensed water heat exchanger is connected to the water receiving pan; The air conditioner also includes: A first valve, which is arranged on the drainage pipeline at the drainage outlet; a second valve, which is arranged on the pipeline between the bypass port and the outlet of the condensate heat exchanger; a main control unit, which, when the air conditioner is in cooling operation and the water level in the water receiving pan reaches the first water level but does not reach the second water level, determines whether the water inlet temperature at the water inlet of the condensing water heat exchanger reaches a preset temperature lower limit and whether the indoor return air temperature difference reaches a preset temperature difference lower limit; if both are true, controls the outdoor unit to stop, the first valve and the second valve to be connected, and the drainage pump to operate; otherwise, keeps the outdoor unit working, controls the first valve and the second valve to be connected, and the drainage pump to operate; Wherein, the second water level is higher than the first water level.

[0007] The air conditioner involved in the present application is provided with a drain outlet and a bypass outlet for a drain pump. The drain outlet is used to drain water outwards, and the bypass outlet is used to introduce part of the condensed water into the condensed water heat exchanger to recycle the cold water in the condensed water for participating in the indoor air heat exchange.

[0008] When the water inlet temperature at the condenser heat exchanger reaches the preset temperature lower limit and the indoor return air temperature difference reaches the preset temperature difference lower limit, it means that the current indoor temperature has reached the set state, the outdoor unit stops, and only the cooling capacity of the low-temperature condensed water circulating in the condenser heat exchanger is used to maintain the indoor temperature, so as to achieve the purpose of saving energy.

[0009] When the water inlet temperature of the condensing water heat exchanger does not reach the preset temperature lower limit or the indoor return air temperature difference does not reach the preset temperature difference lower limit, it means that the indoor temperature is in the cooling stage. At this time, the outdoor unit is working, the refrigerant heat exchanger participates in the heat exchange and at the same time, the low-temperature condensed water is also introduced into the condensing water heat exchanger, so that the condensing water heat exchanger participates in the heat exchange and replaces part of the function of the traditional condenser. Compared with the traditional entire condenser, the refrigerant heat exchanger of this application is small in size and requires less refrigerant to be filled. The corresponding outdoor unit operating load power is also small, the resource utilization rate is high, and the energy-saving and emission reduction effects are obvious.

[0010] In some embodiments of the present application, the air conditioner further comprises: a first float switch, used for outputting a first signal indicating that the water level in the water receiving tray reaches a first water level; a second float switch, used for outputting a second signal indicating that the water level in the water receiving tray reaches a second water level; The main control unit is used to control the action of the drainage pump, the action of the first valve and the action of the second valve according to the signal output by the first float switch and the signal output by the second float switch when the air conditioner is in cooling operation.

[0011] By providing the first float switch and the second float switch, it is ensured that the water level in the water receiving pan can meet the heat exchange of the condensed water condenser, thereby improving the heat exchange reliability.

[0012] A second float switch is provided to detect the water level to ensure that there is no risk of overflow in the water receiving tray.

[0013] In some embodiments of the present application, the main control unit is used to control the action of the drainage pump, the action of the first valve, and the action of the second valve according to the signal output by the first float switch and the signal output by the second float switch when the air conditioner is in cooling operation, specifically: S1: The air conditioner starts cooling operation; S2: Controlling the first valve and the second valve to be disconnected, and the water receiving tray starts to store water. At this time, the drainage pump does not operate; S3: Detect whether the first float switch outputs a first signal, if so, proceed to S4, if not, return to S2; S4: controlling the drainage pump to operate, and controlling the first valve and the second valve to be connected; S5: Real-time detection of whether the first float switch outputs a first signal, if not, proceed to S6, if yes, proceed to S7; S6: reducing the rotation speed of the drainage pump or controlling to disconnect the first valve, and returning to S5; S7: Real-time detection of whether the second float switch outputs a second signal, if so, proceed to S8, if not, proceed to S9; S8: Control the indoor fan to stop running and disconnect the second valve, and if the first valve is currently open, it remains open; if it is currently disconnected, control the first valve to open, the drainage pump runs to drain, and return to S7; S9: Keep the drainage pump running and keep the first valve and the second valve connected, and return to S5.

[0014] As described above, the signal output by the first float switch and the signal output by the second float switch control the on-off of the first valve and the second valve and the operation of the drainage pump, thereby ensuring that the water level in the water receiving pan meets the requirements of the condensate heat exchanger for heat exchange.

[0015] In some embodiments of the present application, along the direction from the air inlet side to the air outlet side of the condenser, the refrigerant heat exchanger is located below the condensate heat exchanger.

[0016] With this arrangement, since the refrigerant heat exchanger is highly efficient, the temperature is relatively low, so when the indoor air exchanges heat with the refrigerant heat exchanger, the air outlet temperature is low and the humidity is low, so the airflow flows downward quickly, while the condensate heat exchanger is inefficient, so the temperature is relatively high and the humidity is high, so the airflow flows downward slowly.

[0017] Therefore, the two air flows are mixed at the air outlet to form mixed air with uniform temperature and humidity, achieving the effect of comfort control, so that the air outlet is not too cold like the air outlet of traditional air conditioners, and the temperature and humidity changes are too fast to affect the comfort of users.

[0018] In some embodiments of the present application, the air conditioner further comprises: A water pump driving unit is connected to the main control unit and is used to drive the drainage pump to operate.

[0019] In some embodiments of the present application, the water pump driving unit includes: The water pump driving 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 arranged on the periphery of the water pump driving chip for overcurrent protection of the drainage pump motor.

[0020] The water pump driving 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.

[0021] The overcurrent protection circuit may include a plurality of current limiting resistors. By setting different resistance values ​​of the current limiting resistors and setting current protection limits, overcurrent protection for different motor currents can be achieved.

[0022] In some embodiments of the present application, the air conditioner further comprises: A valve driving unit is connected to the main control unit and is also electrically connected to the first valve and the second valve. When the main control unit outputs a first control signal, the first valve is driven to be opened and closed by the valve driving unit. When the main control unit outputs a second control signal, the second valve is driven to be opened and closed by the valve driving unit.

[0023] In some embodiments of the present application, the valve drive unit includes: A valve driving 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 valve, one end of the coil of the relay 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 valve, so that when the normally open switch is closed, the valve is connected, and when the normally open switch is opened, the valve is opened.

[0024] By controlling the relay coil to be energized / de-energized, the valve power supply line is connected / disconnected, thereby realizing the connection / disconnection of the valve.

[0025] In some embodiments of the present application, the indoor heat exchanger comprises: A fin group is arranged obliquely toward the air inlet side of the indoor heat exchanger; a first heat exchange pipe, which runs through the fin group and has a first inlet and a first outlet, wherein the first inlet receives the refrigerant entering the indoor unit side and flows back to the compressor from the first outlet; The second heat exchange pipe runs through the fin group and is located below the first heat exchange pipe. The second heat exchange pipe has a second inlet and a second outlet. The second inlet is the inlet of the condensate heat exchanger, and the second outlet is the outlet of the condensate heat exchanger.

[0026] The fin group is tilted toward the air inlet side of the indoor heat exchanger. Refrigerant flows through the first heat exchange pipe, low-temperature condensate flows through the second heat exchange pipe, and the first heat exchange pipe is located above the second heat exchange pipe. In this way, it is convenient for the indoor air to be blown out after heat exchange through the refrigerant heat exchanger and sink to mix with the airflow after heat exchange through the condensate heat exchanger, thereby achieving a comfort control effect.

[0027] The present application also relates to an air conditioner, comprising: an indoor unit including an indoor heat exchanger; The outdoor unit has an outdoor heat exchanger, the indoor heat exchanger is one of the evaporator and the condenser, and the outdoor heat exchanger is the other; A water receiving tray is placed in the indoor unit and is used to receive condensed water generated when the air flows through the indoor heat exchanger during cooling operation of the air conditioner; a drain pump installed in the water receiving tray and having a water inlet and a drain outlet, wherein the water inlet is communicated with the water receiving tray, and the drain outlet is used to discharge condensed water in the water receiving tray to the outside; The indoor heat exchanger includes a condensed water heat exchanger and a refrigerant heat exchanger capable of heat exchange with each other, and the refrigerant is refrigerated through a compressor, an outdoor heat exchanger, a throttling element and a refrigerant heat exchanger in an outdoor unit. The drain pump also has a bypass port connected to the water inlet for introducing condensed water into the inlet of the condensed water heat exchanger, and the outlet of the condensed water heat exchanger is connected to the water receiving pan; The air conditioner also includes: Condensate pipe temperature sensor, which is used to detect the water inlet temperature at the condensate heat exchanger; Indoor return air temperature sensor, which is used to detect indoor return air temperature; a main control unit, which, when the air conditioner is in cooling operation and the water level in the water receiving pan reaches the first water level but does not reach the second water level, determines whether the water inlet temperature of the condensate heat exchanger reaches a preset temperature lower limit and whether the indoor return air temperature difference reaches a preset temperature difference lower limit; if both are true, controls the outdoor unit to stop and the drainage pump to operate, so that part of the condensate is discharged and part of the condensate is introduced into the condensate heat exchanger for heat exchange; otherwise, keeps the outdoor unit working and the drainage pump to operate, so that part of the condensate is discharged and part of the condensate is introduced into the condensate heat exchanger for heat exchange; Wherein, the second water level is higher than the first water level.

[0028] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces 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 creative labor.

[0030] Figure 1 A structural block diagram of an air conditioner according to an embodiment of the air conditioner proposed in the present application; Figure 2 A front view of a drainage pump in an embodiment of an air conditioner according to the present application; Figure 3 A top view of a drainage pump in an air conditioner embodiment according to the present application; Figure 4 A schematic diagram of a drainage pump in an air conditioner embodiment according to the present application performing drainage; Figure 5 is a system block diagram of an air conditioner embodiment according to the present application; Figure 6 A pin connection diagram of an air conditioner embodiment according to the present application; Figure 7 A flowchart of comfort control according to an air conditioner embodiment proposed in this application; Figure 8 A schematic diagram of the positions of the indoor heat exchanger and the indoor fan in the air conditioner embodiment proposed in the present application; Fig. 9 A flow chart of water level control according to an air conditioner embodiment proposed in this application; Fig.10 Schematic diagram of control principle of valves in an air conditioner embodiment proposed in this application.

[0031] Reference numerals: 100. Water tray; 200, drainage pump; 210, water inlet; 220, drainage outlet; 230, bypass outlet; 300, indoor heat exchanger; 310, refrigerant heat exchanger; 311, first inlet; 312, first outlet; 320, condensate heat exchanger; 321, second inlet; 322, second outlet; 400, first float switch; 400'- second float switch; 500, condensate pipe temperature sensor; 500', indoor return air temperature sensor; 500", main control unit; 600, water pump drive unit; 700, valve drive unit; 700', first valve; 700'', second valve; 710, valve drive chip; 720, first relay; 730, second relay; 800, indoor fan; 800', fan drive unit; 800'', communication unit; 900, air outlet; L1, drainage pipeline; L2, bypass pipeline; L3, discharge pipeline. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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, and therefore should not be understood as a limitation on the present application.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0038] <Basic working principle of air conditioner> The air conditioner performs the air conditioner's refrigeration cycle by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat the indoor space.

[0039] The low-temperature and low-pressure refrigerant enters the compressor, which compresses it into high-temperature and 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, and the heat is released to the surrounding environment through the condensation process.

[0040] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature and low-pressure refrigerant gas to the compressor. The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0041] The outdoor unit of the air conditioner refers to a part 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 the expansion valve may be provided in the indoor unit or the outdoor unit.

[0042] 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 (and the outdoor heat exchanger functions as an evaporator), the air conditioner functions as a heater in the heating mode, and when the indoor heat exchanger functions as an evaporator (and the outdoor heat exchanger functions as a condenser), the air conditioner functions as a cooler in the cooling mode.

[0043] The drain pump 200 is a component of the indoor unit of the air conditioner. 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 indoor unit of the air conditioner when the drain pump 200 starts to operate.

[0044] Since the condensed water in the water receiving tray 100 is the condensed water generated when passing through the evaporator, its temperature is relatively low. If it is directly discharged to the outside of the indoor unit, the cooling capacity of the low-temperature condensed water will be wasted.

[0045] Therefore, in order to solve the above technical problems, the present application proposes an air conditioner, which can divide the indoor heat exchanger 300 into two parts: an independent refrigerant heat exchanger 310 and a condensed water heat exchanger 320. The condensed water to be discharged participates in the heat exchange cycle in the condensed water heat exchanger 320, and the cold energy in the condensed water to be discharged is effectively utilized to achieve effective utilization of cold energy, thereby achieving the purpose of saving air conditioning energy consumption, and the water circulation heat exchange helps to improve user comfort.

[0046] See also Figure 1The air conditioner includes an outdoor unit, an indoor unit, a water receiving pan 100, a drainage pump 200, a first valve 700', a second valve 700'' and a main control unit 500''. When the air conditioner is cooling, the indoor heat exchanger 300 is an evaporator and the outdoor heat exchanger is a condenser.

[0047] As shown below, only the various components are controlled during cooling operation in the cooling mode of the air conditioner.

[0048] In some embodiments of the present application, the indoor heat exchanger 300 includes a refrigerant heat exchanger 310 and a condensed water heat exchanger 320, which are independent of each other and have no flow paths connected to each other, but are close to each other and can exchange heat with each other.

[0049] Among them, in the refrigerant heat exchanger 310, it is used for the refrigerant to flow through, and in the condensate heat exchanger 320, it is used for the condensate to flow through.

[0050] When the outdoor unit is running, the refrigerant undergoes a refrigeration cycle through the compressor, condenser, throttling element and refrigerant heat exchanger 310 in the outdoor unit.

[0051] The water receiving tray 100 is located in the indoor unit and is used to receive condensed water generated when the airflow passes through the low-temperature indoor heat exchanger surface during the cooling operation of the air conditioner.

[0052] See also Figure 2 and Figure 3 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.

[0053] The drain port 220 is used to discharge the condensed water in the water receiving pan 100 to the outside of the indoor unit; the bypass port 230 is used to discharge the condensed water in the water receiving pan 100 to the condensed water heat exchanger 320.

[0054] See also Figure 4 The inlet of the condensed water heat exchanger 320 is connected to the bypass port 230 through the bypass pipe L2, and the outlet of the condensed water heat exchanger 320 returns to the water receiving pan 100 through the discharge pipe L3, thereby realizing the heat exchange cycle of the condensed water.

[0055] The drain pump 200 is located in the water receiving tray 100 . The drain pump 200 is installed in the water receiving tray 100 , for example, inverted 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 .

[0056] When the drain pump 200 is running, the water inlet 210 of the drain pump 200 can extract the condensed water collected in the water tray 100 .

[0057] In order to realize different drainage directions of condensed water when the drain pump 200 is running, see Figure 4 The first valve 700' is disposed 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 of the indoor unit when the main control unit 500' controls the first valve 700' to be connected, and when the first valve 700' is controlled to be disconnected, the water receiving tray 100 stores water.

[0058] The second valve 700'' is arranged on the bypass pipeline L2 between the bypass port 230 and the inlet of the condensation water heat exchanger 320, and is used to lead the condensation water in the water receiving pan 100 into the condensation water heat exchanger 320 when the main control unit 500'' controls the second valve 700'' to be connected. At this time, the condensation water heat exchanger 320 exchanges heat with the indoor air, and when the second valve 700'' is controlled to be disconnected, the condensation water in the water receiving pan 100 is not introduced into the condensation water heat exchanger 320. At this time, the condensation water heat exchanger 320 does not participate in the heat exchange.

[0059] By providing the drainage pipeline L1, the bypass pipeline L2 and the discharge pipeline L3, the transmission distance of the water flow is extended.

[0060] The provision of the drainage pipeline 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.

[0061] The extension of the water flow distance in the bypass line L2 and the discharge line L3 enables the indoor heat exchanger to reach any position of the water receiving pan 100 .

[0062] See also Figure 5 The air conditioner may further include a water pump driving unit 600, which is connected to the main control unit 500'' and is used to receive a PWM pulse driving signal issued by the main control unit 500'' and control the operation of the drainage pump 200 based on the PWM pulse driving signal.

[0063] 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 is; 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 is.

[0064] In some embodiments of this application, see Figure 6 , the main control unit 500'' adopts an integrated MCU chip.

[0065] In some embodiments of the present application, see Figure 5The main control unit 500'' is connected to the fan driving unit 800' through 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.

[0066] The communication unit 800 ″ may adopt a UART communication circuit.

[0067] 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 ″.

[0068] See also Figure 6 The water pump driving unit 600 includes a water pump driving chip having a PWM pin, and the PWM pin is used to receive a PWM pulse signal output by a first output pin of the MCU chip.

[0069] The water pump driving chip also has an overcurrent protection function, and an overcurrent protection circuit is set on its periphery to achieve current limiting protection for the drainage pump 200 motor.

[0070] In some embodiments of this application, see Figure 6 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.

[0071] The overcurrent protection circuit includes a first resistor R1, a second resistor R2 and a third resistor R3.

[0072] The first pin is grounded through the first resistor R1 , the second pin is grounded through the 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 the third resistor R3 .

[0073] The overcurrent protection limit of the motor of the drainage pump 200 can be set by setting the value of each resistor, and different overcurrent protection limit values ​​can be set by changing the value of each resistor.

[0074] See also Figure 6 The water pump driver chip also has a speed feedback pin, and the MCU chip has a third input pin.

[0075] The speed feedback pin is connected to the third input pin, and is used for 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.

[0076] In some embodiments of this application, see Figure 5 and Figure 6The air conditioner also includes a condensing water pipe temperature sensor 500 and an indoor return air temperature sensor 500', which are respectively connected to a main control unit 500'' and are used to transmit the temperatures detected by the condensing water pipe temperature sensor 500 and the indoor return air temperature sensor 500' to the main control unit 500''.

[0077] The condensate pipe temperature sensor 500 is disposed at the water inlet of the condensate heat exchanger 320 for real-time monitoring of the condensate inlet temperature TL. The indoor return air temperature sensor 500 ′ is disposed at the indoor return air outlet for detecting the indoor return air temperature TR.

[0078] In some embodiments of the present application, when the air conditioner is in cooling operation and the water level in the water receiving tray 100 reaches the first water level but does not reach the second water level, the main control unit 500' controls the outdoor unit, the drain pump 200, and the first valve 700' and the second valve 700'' according to the water inlet temperature TL at the water inlet of the condensate heat exchanger 320 and the indoor return air temperature difference.

[0079] The indoor return air temperature difference may be the absolute value of the difference between the indoor return air temperature TR and the preset indoor return air temperature.

[0080] As mentioned above, the second water level is higher than the first water level. The second water level here is understood to be an overflow level, that is, when the water level reaches the second water level, there is a risk of overflow. At this time, it is necessary to connect the water tray 100 in time to drain the water. For example, the second valve 700'' can be controlled to be disconnected and the first valve 700' can be connected. At the same time, the rotation speed of the drainage pump 200 can be increased to improve the drainage rate and avoid safety risks caused by overflow.

[0081] The first water level and the second water level are set as above to ensure that the condensed water can circulate in sufficient quantity without causing the risk of overflow.

[0082] In this way, during the operation of the air conditioner, it is necessary to monitor the first water level and the second water level.

[0083] In some embodiments of the present application, see Figure 5 and Figure 6 The air conditioner is provided with a first float switch 400 and a second float switch 400 ′, both of which are arranged in the water receiving tray 100 .

[0084] The first float switch 400 is used to detect a first water level, and a first preset water level is preset inside the first float switch 400 ; the second float switch 400 ′ is used to detect a second water level, and a second preset water level is preset inside the second float switch 400 ′.

[0085] When the water level in the water receiving tray 100 reaches the first preset water level, the first float switch 400 is actuated and sends a first signal, which is transmitted to the main control unit 500 ″, that is, when the first float switch 400 outputs the first signal, it indicates that the water level reaches the first water level.

[0086] When the water level in the water receiving tray 100 reaches the second preset water level, the second float switch 400' operates and sends a second signal, which is transmitted to the main control unit 500', that is, when the second float switch 400' outputs the second signal, it indicates that the water level reaches the second water level.

[0087] Generally, the float switch is in a normally closed state, and once the water level in the water receiving tray 100 reaches a preset water level, the float switch is disconnected, that is, in an open state. Therefore, the opening and closing state information of the float switch includes a closed state and an open state.

[0088] For example, in some embodiments of the present application, the power supply +5V is connected to the input end of a voltage divider circuit (not shown) through a float switch, that is, one end of the float switch is connected to +5V and the other end is connected to the input end of the voltage divider circuit.

[0089] When the float switch is closed because the water level does not reach the preset water level, the MCU chip receives a high-level detection signal, and when the float switch is disconnected because the water level reaches the preset water level, the MCU chip receives a low-level detection signal (that is, for the first float switch 400, the detection signal is the first signal, and for the second float switch 400', the detection signal is the second signal).

[0090] 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.

[0091] 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 (i.e., the first 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 generate condensed water.

[0092] In order to remind manual drainage in time, the air conditioner further 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 (i.e., the second signal) output by the second float switch 400', so as to intuitively remind the user to drain the water in time.

[0093] As described above, in some embodiments of the present application, when the air conditioner is in cooling operation and the water level in the water receiving tray 100 reaches the first water level but does not reach the second water level, the main control unit 500' controls the outdoor unit, the drain pump 200, and the first valve 700' and the second valve 700' by specifically judging whether the water inlet temperature TL at the water inlet of the condensate heat exchanger 320 reaches the preset temperature lower limit and whether the indoor return air temperature difference reaches the preset temperature difference lower limit.

[0094] Among them, the preset temperature lower limit value is preset and can be a temperature range or a temperature value; similarly, the preset temperature difference lower limit value is also preset and can be a temperature difference range or a temperature value.

[0095] For example, the preset temperature lower limit value may be the minimum set temperature TSL at the water inlet of the condensate heat exchanger 320 , the preset temperature difference lower limit value may be the user-set temperature difference deviation threshold ΔT, and the preset indoor return air temperature may be the user-set temperature TRS.

[0096] The indoor return air temperature difference and the water inlet temperature TL of the condensing water heat exchanger 320 are used to determine whether the current indoor temperature meets the set state.

[0097] See also Figure 7 , which shows a flow chart of air conditioner comfort adjustment control.

[0098] The premise for performing comfort adjustment control is to ensure that the water level in the water receiving tray 100 reaches the first water level and does not reach the second water level.

[0099] As follows, combined Figure 7 , describing the process of comfort adjustment control.

[0100] During the cooling operation of the air conditioner, the water inlet temperature TL and the return air temperature TR at the water inlet of the condensing water heat exchanger 320 are continuously monitored. When it is determined that the water inlet temperature TL at the water inlet of the condensing water heat exchanger 320 reaches the preset temperature lower limit and the indoor return air temperature difference reaches the preset temperature difference lower limit (called the first stage), for example, TL≤TLS and |TRS-TR|≤△T, it proves that the room temperature has reached the set state and can be maintained at room temperature subsequently. At this time, the outdoor unit is shut down and only the condensing water heat exchanger 320 is used for heat exchange to maintain the room temperature, thereby achieving energy saving.

[0101] That is, the outdoor unit is stopped, the drainage pump 200 is operated, and the second valve 700 ″ is controlled to be connected.

[0102] At this time, the first valve 700 ′ is also connected, so that the condensed water can be partially discharged to the outside while participating in the circulation.

[0103] When it is determined that the water inlet temperature TL at the condensing water heat exchanger 320 reaches the preset temperature upper limit, or the indoor return air temperature difference reaches the preset temperature difference upper limit (called the second stage), for example, TL>TLS or |TRS-TR|>△T, it proves that the temperature in the room is still in the cooling stage.

[0104] At this time, continue to maintain normal operation of the outdoor unit to keep the refrigerant heat exchanger 310 participating in heat exchange. At the same time, control the drainage pump 200 to operate and control the second valve 700'' to be connected so that condensed water enters the condensed water heat exchanger 320. At this time, the condensed water heat exchanger 320 also continues to participate in heat exchange.

[0105] At this time, the first valve 700 ′ is also connected, so that the condensed water can be partially discharged to the outside while participating in the circulation.

[0106] In this second stage, compared with the traditional evaporator, which is entirely filled with refrigerant for heat exchange, the refrigerant heat exchanger is large in size, requires a large amount of refrigerant flow, and the outdoor unit has a large operating load power. This application uses the condensate heat exchanger 320 that circulates low-temperature condensate to participate in the heat exchange, replacing part of the function of the traditional refrigerant heat exchanger. The refrigerant filling volume is small, the resource utilization rate is high, and the energy-saving and emission reduction effect is obvious.

[0107] In the second stage as described above, both the condensate heat exchanger 320 and the refrigerant heat exchanger 310 participate in heat exchange.

[0108] When the indoor air passes through the refrigerant heat exchanger 310, since the refrigerant heat exchanger 310 has high efficiency, the outlet temperature and humidity of the indoor air when exchanging heat with the refrigerant heat exchanger are low.

[0109] When the indoor air passes through the condensation water heat exchanger 320, since the efficiency of the condensation water heat exchanger 320 is low, the outlet air temperature is moderate and the humidity is high when the indoor air exchanges heat with the condensation water heat exchanger 320.

[0110] In this way, when the refrigerant heat exchanger 310 and the condensate heat exchanger 320 both participate in heat exchange, the airflow after heat exchange forms mixed air at the air outlet. The mixed air mixes the airflow with low temperature and low humidity and the airflow with moderate temperature and high humidity, thereby forming an airflow with uniform temperature and humidity, avoiding the air outlet being too cold to affect the user's comfort, and providing a comfortable environment indoors.

[0111] In some embodiments of the present application, in order to better achieve comfort control, the indoor heat exchanger 300 is tilted toward the air inlet side, and the upper part is the refrigerant heat exchanger 310 and the lower part is the condensate heat exchanger 320, so as to facilitate airflow mixing.

[0112] See also Figure 8 , which shows the position of the indoor heat exchanger 300 and its positional relationship with the indoor fan 800.

[0113] In the second stage as described above, both the condensate heat exchanger 320 and the refrigerant heat exchanger 310 participate in heat exchange.

[0114] When the indoor air passes through the refrigerant heat exchanger 310, due to the high efficiency of the refrigerant heat exchanger 310, the outlet temperature and humidity of the indoor air when exchanging heat with the refrigerant heat exchanger are low, so the airflow flows downward at a fast speed.

[0115] When the indoor air passes through the condensation water heat exchanger 320, due to the low efficiency of the condensation water heat exchanger 320, the outlet temperature of the indoor air when exchanging heat with it is moderate and the humidity is high, so the airflow flows downward slowly.

[0116] In this way, when both the refrigerant heat exchanger 310 and the condensate heat exchanger 320 participate in heat exchange, the airflow after heat exchange with the refrigerant heat exchanger 310 flows downward and mixes with the airflow after heat exchange with the condensate heat exchanger 320. Therefore, mixed air with uniform temperature and humidity is formed at the air outlet 900, achieving the effect of comfort control.

[0117] In some embodiments of the present application, see Figure 4 The indoor heat exchanger 300 includes a fin group (not shown), a first heat exchange pipe and a second heat exchange pipe. The first heat exchange pipe and the second heat exchange pipe both pass through the fin group, and the second heat exchange pipe is located below the first heat exchange pipe.

[0118] The first heat exchange pipe has a first inlet 311 and a first outlet 312 . The first inlet 311 receives the refrigerant entering the indoor unit side, and the refrigerant flowing through the refrigerant heat exchanger 310 flows back to the compressor from the first outlet 312 .

[0119] The second heat exchange pipe has a second inlet 321 and a second outlet 322 . The second inlet 321 is the inlet of the condensate heat exchanger 320 described above, and the second outlet 322 is the outlet of the condensate heat exchanger 320 described above.

[0120] As described above, in order to achieve the water level requirement in the water receiving pan 100 (i.e., reaching the first water level and not reaching the second water level), it is necessary to control the operation of the drain pump 200, and control the on / off of the first valve 700' and the on / off of the second valve 700'' according to the signal output by the first float switch 400 and the signal output by the second float switch 400'' during the cooling operation of the air conditioner.

[0121] See also Fig. 9 , which describes a flow chart for controlling the water level in the water receiving tray 100.

[0122] Combination Fig. 9 , the specific description is as follows.

[0123] S1: The air conditioner starts cooling operation.

[0124] At the initial stage of cooling operation of the air conditioner, the refrigerant undergoes a refrigeration cycle through the compressor, condenser, throttling element and refrigerant heat exchanger 310 in the outdoor unit.

[0125] S2: The first valve 700 ′ and the second valve 700 ″ are both controlled to be disconnected, and water begins to be stored in the water receiving tray 100 . At this time, the drainage pump 200 does not operate.

[0126] At the beginning of the cooling operation of the air conditioner, water needs to be stored in the water receiving pan 100 to ensure that the condensed water in the water receiving pan 100 has an initial water storage volume when participating in the heat exchange cycle.

[0127] At this time, the first valve 700 ′ and the second valve 700 ″ are both controlled to be disconnected, the drain pump 200 does not operate, the condensed water heat exchanger 320 does not participate in heat exchange (ie, the condensed water does not circulate) and the condensed water is not discharged to the outside.

[0128] S3: Detect whether the first float switch 400 outputs the first signal, if so, proceed to S4, if not, return to S2.

[0129] When the water level reaches the first water level, the first float switch 400 is activated, outputs a first signal, and feeds back to the main control unit 500 ″.

[0130] When the first float switch 400 is not actuated, it indicates that the water level has not yet reached the first water level, and water storage continues.

[0131] S4: Control the drainage pump 200 to operate, and control the first valve 700 ′ and the second valve 700 ″ to be connected.

[0132] When the main control unit 500' receives the first signal, it controls the drain pump 200 to operate, and at the same time controls the first valve 700' and the second valve 700' to be connected, so that the condensed water heat exchanger 320 participates in the circulation and the condensed water is discharged to the outside at the same time, that is, part of the condensed water is discharged to the outside through the first valve 700' and the other part is introduced into the condensed water heat exchanger 320 through the second valve 700' and returns to the water receiving tray 100 after circulation.

[0133] S5: Real-time detection of whether the first float switch 400 outputs the first signal, if not, proceed to S6, if yes, proceed to S7.

[0134] In order to ensure that the water level in the water receiving tray 100 can reach the first water level, it is necessary to continuously detect whether the first float switch 400 outputs the first signal during the operation of the air conditioner.

[0135] S6: reduce the rotation speed of the drainage pump 200 or control the first valve 700' to be disconnected, and return to S5.

[0136] If the first float switch 400 does not output the first signal, it indicates that the first water level has not been reached. At this time, since the drain pump 200 is running and the first valve 700' is open, the rotation speed of the drain pump 200 can be reduced to reduce the drainage speed, or the first valve 700' can be disconnected to prevent condensed water from being discharged, until the water level reaches the first water level.

[0137] S7: Real-time detection of whether the second float switch 400' outputs the second signal, if yes, proceed to S8, if no, proceed to S9.

[0138] In order to ensure that the water level in the water receiving tray 100 does not exceed the second water level and avoid the risk of overflow, it is necessary to detect whether the second float switch 400 ′ outputs the second signal under the premise that the first float switch 400 outputs the first signal.

[0139] S8: Control the indoor fan 800 to stop running and the second valve 700 ″ to be disconnected, keep the first valve 700 ′ connected, operate the drainage pump 200 to drain water, and return to S7.

[0140] If the second float switch 400' outputs a second signal, it indicates that the water level has reached the second water level. At this time, due to the risk of overflow, it is necessary to control the indoor fan 800 to stop running to avoid regeneration of condensed water. The second valve 700' is controlled to be disconnected, and condensed water circulation is not performed. If the first valve 700' is currently open, it remains open. If it is currently disconnected, it is controlled to open. At this time, the drain pump 200 is running at the maximum speed, for example. Therefore, the condensed water is quickly discharged to the outside through the first valve 700' until the second float switch 400' releases the action output signal.

[0141] During the drainage process, the water level changes are monitored in real time.

[0142] S9: Keep the drain pump 200 running and keep the first valve 700 ′ and the second valve 700 ″ connected, and return to S5 .

[0143] If the second float switch 400 ′ does not output the second signal, it means that the water level has not reached the second water level. At this time, the water level in the water receiving tray 100 meets the heat exchange requirement (ie, the water level has reached the first water level but has not reached the second water level).

[0144] At this time, keep controlling the drain pump 200 to operate, and at the same time control the first valve 700' and the second valve 700'' to be connected, so that the condensed water heat exchanger 310 participates in the circulation and the condensed water is discharged to the outside at the same time, that is, part of the condensed water is discharged to the outside through the first valve 700' and the other part is introduced into the condensed water heat exchanger 320 through the second valve 700'' and returns to the water receiving pan 100 after circulation.

[0145] It should be noted in S9 that after the drainage pump 200 is kept running and the first valve 700 ′ and the second valve 700 ″ are kept connected, there are two situations in which the water level changes.

[0146] (1) The water level continues to increase on the basis of the first water level (i.e., the first float switch 400 has output the first signal), therefore, the process can return to S7 to determine the operation of the second float switch 400'; (2) The water level continues to decrease below the first water level, therefore, the process can return to S5 to determine the operation of the first float switch 400.

[0147] The valve as described above may be a solenoid valve, a piezoelectric valve, a MEMS (Micro-Electro-Mechanical System) valve, an angle seat valve or the like, which can be controlled to open, connect or close.

[0148] In some embodiments of the present application, both the first valve 700 ′ and the second valve 700 ″ may be solenoid valves.

[0149] In some embodiments of this application, see Fig.10 The valve driving unit 700 drives the first valve 700 ′ and the second valve 700 ″ to be turned on and off.

[0150] The main control unit 500 ″ is connected to the valve driving unit 700 .

[0151] In some embodiments of the present application, the main control unit 500'' outputs a corresponding control signal based on the action output signal of the first float switch 400, the action output signal of the second float switch 400', whether the water inlet temperature TL at the water inlet of the condensate heat exchanger 320 reaches a preset temperature lower limit, and whether the indoor return air temperature difference reaches a preset temperature difference lower limit. Based on the control signal, the valve drive unit 700 is actuated to drive the valve to open and close in response to the control signal.

[0152] 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.

[0153] In some embodiments of the present application, the plurality of input terminals are two input terminals, which are respectively used to receive two control signals from the main control unit 500 ″, denoted as a first control signal and a second control signal.

[0154] When the main control unit 500'' adopts an MCU chip, the MCU chip outputs a first control signal at the first control pin and outputs a second control signal at the second control pin (see Figure 6 ).

[0155] When the valve driving unit 700 receives the first control signal, the corresponding output end controls the first valve 700' to be turned on or off; when the valve driving unit 700 receives the second control signal, the corresponding output end controls the second valve 700' to be turned on or off.

[0156] In some embodiments of this application, see Fig.10 , the valve driving unit 700 includes a valve driving chip 710 and a plurality of relays.

[0157] When the main control unit 500 ″ adopts an MCU chip, the MCU chip outputs a first control signal at the first control pin, and outputs a second control signal at the second control pin.

[0158] In some embodiments of this application, see Fig.10 , using two input terminals (recorded as the first input terminal and the second input terminal) and the corresponding two output terminals (recorded as the first output terminal and the second output terminal) of the valve driving chip 710.

[0159] The number of multiple relays is equal to the number of valves.

[0160] In some embodiments of the present application, two relays are used, which are denoted as a first relay 720 and a second relay 730 . The first relay 720 and the second relay 730 correspond to the first output terminal and the second output terminal of the valve driving chip 710 , respectively.

[0161] The first input terminal and the second input terminal of the valve driving chip 710 are connected to the first control pin and the second control pin of the MCU chip respectively.

[0162] See also Figure 6 and Fig.10 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.

[0163] The normally open switch of the first relay 720 is connected in series to the power supply line of the first valve 700 ′.

[0164] 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 valve 700 ′. At this time, the first valve 700 ′ is opened and connected.

[0165] When the first control signal drives the first output terminal to output a high level, the coil of the first relay 720 loses power, the normally open switch is disconnected, and the power supply line is disconnected, and the first valve 700' cannot be powered. At this time, the first valve 700' is closed and disconnected.

[0166] 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 source V is connected to the other end of the coil of the second relay 730 .

[0167] The normally open switch of the second relay 730 is connected in series to the power supply line of the second valve 700 ″.

[0168] 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 valve 700 ″. At this time, the second valve 700 ″ is opened and connected.

[0169] When the second control signal drives the second output terminal to output a high level, the coil of the second relay 730 loses power, the normally open switch is disconnected, and the power supply line is disconnected, and the second valve 700'' cannot be powered. At this time, the second valve 700'' is closed and disconnected.

[0170] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0171] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An air conditioner, comprising: an indoor unit having an indoor heat exchanger; The outdoor unit has an outdoor heat exchanger, the indoor heat exchanger is one of the evaporator and the condenser, and the outdoor heat exchanger is the other; A water receiving tray is placed in the indoor unit and is used to receive condensed water generated when the air flows through the indoor heat exchanger during cooling operation of the air conditioner; a drain pump installed in the water receiving tray and having a water inlet and a drain outlet, wherein the water inlet is communicated with the water receiving tray, and the drain outlet is used to discharge condensed water in the water receiving tray to the outside; It is characterized in that The indoor heat exchanger includes a condensed water heat exchanger and a refrigerant heat exchanger capable of heat exchange with each other, and the refrigerant is refrigerated through a compressor, an outdoor heat exchanger, a throttling element and a refrigerant heat exchanger in an outdoor unit. The drain pump also has a bypass port connected to the water inlet for introducing condensed water into the inlet of the condensed water heat exchanger, and the outlet of the condensed water heat exchanger is connected to the water receiving pan; The air conditioner also includes: A first valve, which is arranged on the drainage pipeline at the drainage outlet; a second valve, which is arranged on the pipeline between the bypass port and the inlet of the condensate heat exchanger; Condensate pipe temperature sensor, which is used to detect the water inlet temperature at the condensate heat exchanger; Indoor return air temperature sensor, which is used to detect indoor return air temperature; a main control unit, which, when the air conditioner is in cooling operation and the water level in the water receiving pan reaches the first water level but does not reach the second water level, determines whether the water inlet temperature reaches the preset temperature lower limit and whether the indoor return air temperature difference reaches the preset temperature difference lower limit; if both are true, controls the outdoor unit to stop, the first valve and the second valve to be connected, and the drainage pump to operate; otherwise, keeps the outdoor unit working, controls the first valve and the second valve to be connected, and the drainage pump to operate; Wherein, the second water level is higher than the first water level.

2. The air conditioner according to claim 1, characterized in that: The air conditioner also includes: a first float switch, used for outputting a first signal indicating that the water level in the water receiving tray reaches a first water level; a second float switch, used for outputting a second signal indicating that the water level in the water receiving tray reaches a second water level; The main control unit is used to control the action of the drainage pump, the action of the first valve and the action of the second valve according to the signal output by the first float switch and the signal output by the second float switch when the air conditioner is in cooling operation.

3. The air conditioner according to claim 2, characterized in that: The main control unit is used to control the action of the drainage pump, the action of the first valve and the action of the second valve according to the signal output by the first float switch and the signal output by the second float switch when the air conditioner is in cooling operation, specifically: S1: The air conditioner starts cooling operation; S2: Controlling the first valve and the second valve to be disconnected, and the water receiving tray starts to store water. At this time, the drainage pump does not operate; S3: Detect whether the first float switch outputs a first signal, if so, proceed to S4, if not, return to S2; S4: controlling the drainage pump to operate, and controlling the first valve and the second valve to be connected; S5: Real-time detection of whether the first float switch outputs a first signal, if not, proceed to S6, if yes, proceed to S7; S6: reducing the rotation speed of the drainage pump or controlling to disconnect the first valve, and returning to S5; S7: Real-time detection of whether the second float switch outputs a second signal, if yes, proceed to S8, if no, proceed to S9; S8: Control the indoor fan to stop running and the second valve to be disconnected, and if the first valve is currently open, it remains open; if it is currently disconnected, control the first valve to be opened, the drainage pump to run to drain, and return to S7; S9: Keep the drainage pump running and keep the first valve and the second valve connected, and return to S5.

4. The air conditioner according to claim 1, characterized in that: Along the direction from the air inlet side to the air outlet side of the condenser, the refrigerant heat exchanger is located below the condensate heat exchanger.

5. The air conditioner according to claim 1, characterized in that: The air conditioner also includes: A water pump driving unit is connected to the main control unit and is used to drive the drainage pump to operate.

6. The air conditioner according to claim 5, characterized in that: The water pump driving unit comprises: The water pump driving 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 arranged on the periphery of the water pump driving chip for overcurrent protection of the drainage pump motor.

7. The air conditioner according to claim 1, characterized in that: The air conditioner also includes: A valve driving unit is connected to the main control unit and is also electrically connected to the first valve and the second valve. When the main control unit outputs a first control signal, the first valve is driven to be opened and closed by the valve driving unit. When the main control unit outputs a second control signal, the second valve is driven to be opened and closed by the valve driving unit.

8. The air conditioner according to claim 7, characterized in that: The valve drive unit comprises: a valve driving 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 valve, one end of the coil of the relay 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 valve, so that when the normally open switch is closed, the valve is connected, and when the normally open switch is opened, the valve is opened.

9. The air conditioner according to claim 1, characterized in that: The indoor heat exchanger comprises: A fin group is arranged obliquely toward the air inlet side of the indoor heat exchanger; a first heat exchange pipe, which runs through the fin group and has a first inlet and a first outlet, wherein the first inlet receives the refrigerant entering the indoor unit side and flows back to the compressor from the first outlet; The second heat exchange pipe runs through the fin group and is located below the first heat exchange pipe. The second heat exchange pipe has a second inlet and a second outlet. The second inlet is the inlet of the condensate heat exchanger, and the second outlet is the outlet of the condensate heat exchanger.

10. An air conditioner, comprising: an indoor unit including an indoor heat exchanger; The outdoor unit has an outdoor heat exchanger, the indoor heat exchanger is one of the evaporator and the condenser, and the outdoor heat exchanger is the other; A water receiving tray is placed in the indoor unit and is used to receive condensed water generated when the air flows through the indoor heat exchanger during cooling operation of the air conditioner; a drain pump installed in the water receiving tray and having a water inlet and a drain outlet, wherein the water inlet is communicated with the water receiving tray, and the drain outlet is used to discharge condensed water in the water receiving tray to the outside; It is characterized in that The indoor heat exchanger includes a condensed water heat exchanger and a refrigerant heat exchanger capable of heat exchange with each other, and the refrigerant is refrigerated through a compressor, an outdoor heat exchanger, a throttling element and a refrigerant heat exchanger in an outdoor unit. The drain pump also has a bypass port connected to the water inlet for introducing condensed water into the inlet of the condensed water heat exchanger, and the outlet of the condensed water heat exchanger is connected to the water receiving pan; The air conditioner also includes: Condensate pipe temperature sensor, which is used to detect the water inlet temperature at the condensate heat exchanger; Indoor return air temperature sensor, which is used to detect indoor return air temperature; a main control unit, which, when the air conditioner is in cooling operation and the water level in the water receiving pan reaches the first water level but does not reach the second water level, determines whether the water inlet temperature reaches a preset temperature lower limit and whether the indoor return air temperature difference reaches a preset temperature difference lower limit; if both are true, controls the outdoor unit to stop and the drainage pump to operate, so that part of the condensed water is discharged and part of the condensed water is introduced into the condensed water heat exchanger for heat exchange; otherwise, keeps the outdoor unit working and the drainage pump to operate, so that part of the condensed water is discharged and part of the condensed water is introduced into the condensed water heat exchanger for heat exchange; Wherein, the second water level is higher than the first water level.

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