Air conditioner

Abstract

The invention relates to an air conditioner which comprises an air conditioner indoor unit and an air conditioner outdoor unit. The air conditioner indoor unit comprises a shell; an indoor heat exchanger; a heat exchange fan; the formaldehyde catalyzing device is arranged on the air inlet side of the indoor heat exchanger, is connected to the indoor heat exchanger and is used for catalytically decomposing formaldehyde; the indoor coil pipe sensor is arranged on the indoor heat exchanger and used for detecting the temperature of an indoor coil pipe; the air conditioner outdoor unit at least comprises a compressor, and the compressor communicates with the indoor heat exchanger through a refrigerant loop; the controller is configured as follows: the indoor heat exchanger works as a condenser, and when the temperature of an indoor coil pipe is higher than a first catalytic temperature, the running frequency of the compressor is controlled to be reduced, and the rotating speed of the heat exchange fan is controlled to be increased; and when the obtained indoor coil pipe temperature is lower than the second catalytic temperature, the frequency of the compressor is controlled to be increased, the rotating speed of the heat exchange fan is controlled to be reduced, temperature rise of the formaldehyde catalytic device is facilitated, and the formaldehyde catalytic decomposition efficiency is improved.

Description

Technical Field

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

[0002] Air conditioners usually include an indoor unit and an outdoor unit, and some air conditioners have the function of removing formaldehyde.

[0003] At present, the indoor unit of the air conditioner usually includes a housing, an indoor heat exchanger and a formaldehyde removal filter. The housing is provided with a heat exchange outlet. The indoor heat exchanger is arranged inside the housing, and the refrigerant flowing inside the housing exchanges heat with the indoor air to form a heating cycle or a cooling cycle. After the heat exchange, the indoor air flows to the outside of the housing through the heat exchange outlet. The formaldehyde removal filter is used to absorb formaldehyde in the indoor air. The formaldehyde removal filter has a service life and needs to be replaced frequently.

[0004] In the related art, formaldehyde gas in the indoor air is removed by passing indoor air through a formaldehyde removal filter. However, formaldehyde is currently removed through the indoor unit of the air conditioner. The method of removing formaldehyde is single, the efficiency of removing formaldehyde is low, and the formaldehyde removal filter needs to be replaced frequently, and the formaldehyde removal efficiency cannot be adjusted.

[0005] In view of this, this application is filed. Summary of the invention

[0006] The present invention solves one of the technical problems in the related art at least to a certain extent.

[0007] To this end, the present application aims to provide an air conditioner to help improve the catalytic decomposition efficiency of formaldehyde in indoor air.

[0008] To achieve the above object, the present invention provides an air conditioner, comprising:

[0009] Air conditioner indoor unit and air conditioner outdoor unit;

[0010] The air conditioner indoor unit comprises:

[0011] A housing, comprising at least a heat exchange air inlet and a heat exchange air outlet;

[0012] An indoor heat exchanger is arranged inside the shell, and the refrigerant flowing inside the indoor heat exchanger exchanges heat with the indoor air to form a heating cycle or a cooling cycle. The indoor air enters the shell through the heat exchange air inlet, exchanges heat with the indoor heat exchanger, and flows to the outside of the shell through the heat exchange air outlet;

[0013] A heat exchange fan, used to drive the indoor air to be transported to the indoor through the heat exchange air outlet;

[0014] A formaldehyde catalytic device is arranged on the air inlet side of the indoor heat exchanger, the formaldehyde catalytic device is connected to the indoor heat exchanger, and the formaldehyde catalytic device is used to catalytically decompose formaldehyde;

[0015] An indoor coil sensor is arranged on the indoor heat exchanger and is used to detect the indoor coil temperature;

[0016] The air conditioner outdoor unit at least comprises a compressor, and the compressor is connected to the indoor heat exchanger via a refrigerant circuit;

[0017] The controller is configured as:

[0018] The indoor heat exchanger works as a condenser, and when it is obtained that the temperature of the indoor coil is higher than the first catalytic temperature, the operating frequency of the compressor is controlled to be reduced, and the speed of the heat exchange fan is controlled to be increased;

[0019] When it is obtained that the indoor coil temperature is lower than the second catalytic temperature, the frequency of the compressor is controlled to be increased, and the speed of the heat exchange fan is controlled to be reduced.

[0020] In some embodiments of the present application, the controller is configured to:

[0021] The indoor heat exchanger works as a condenser, and when it is obtained that the temperature of the indoor coil is higher than the third catalytic temperature, the heat exchange fan is controlled to start running at the first speed;

[0022] When it is obtained that the indoor coil temperature is not higher than the third catalytic temperature, the heat exchange fan is controlled to stop running.

[0023] In some embodiments of the present application, the third catalytic temperature is not higher than the first catalytic temperature, and the third catalytic temperature is not lower than the second catalytic temperature.

[0024] In some embodiments of the present application, the controller is configured to:

[0025] When it is obtained that the indoor coil temperature is higher than the fourth catalytic temperature, controlling the frequency of the compressor to periodically reduce a first preset frequency;

[0026] When it is obtained that the indoor coil temperature is not higher than the fourth catalytic temperature, the frequency of the compressor and the speed of the heat exchange fan are controlled to remain unchanged.

[0027] In some embodiments of the present application, the fourth catalytic temperature is not lower than the first catalytic temperature, and the fourth catalytic temperature is higher than the third catalytic temperature.

[0028] The present application also provides an air conditioner, comprising: an air conditioner indoor unit and an air conditioner outdoor unit;

[0029] The air conditioner indoor unit comprises:

[0030] A housing, comprising at least a heat exchange air inlet and a heat exchange air outlet;

[0031] An indoor heat exchanger is arranged inside the shell, and the refrigerant flowing inside the indoor heat exchanger exchanges heat with the indoor air to form a heating cycle or a cooling cycle. The indoor air enters the shell through the heat exchange air inlet, exchanges heat with the indoor heat exchanger, and flows to the outside of the shell through the heat exchange air outlet;

[0032] A heat exchange fan, used to drive the indoor air to be transported to the indoor through the heat exchange air outlet;

[0033] A formaldehyde catalytic device is arranged on the air inlet side of the indoor heat exchanger, the formaldehyde catalytic device is connected to the indoor heat exchanger, and the formaldehyde catalytic device is used to catalytically decompose formaldehyde;

[0034] An indoor coil sensor is arranged on the indoor heat exchanger and is used to detect the indoor coil temperature;

[0035] The air conditioner outdoor unit at least comprises a compressor, and the compressor is connected to the indoor heat exchanger via a refrigerant circuit;

[0036] The controller is configured as:

[0037] The indoor heat exchanger works as a condenser, and when it is obtained that the temperature of the indoor coil is higher than the third catalytic temperature, the heat exchange fan is controlled to start running at the first speed;

[0038] When it is obtained that the indoor coil temperature is not higher than the third catalytic temperature, the heat exchange fan is controlled to stop running.

[0039] In some embodiments of the present application, the controller is configured to:

[0040] When it is obtained that the indoor coil temperature is not higher than the fourth catalytic temperature, controlling the heat exchange fan to run at the current speed;

[0041] When it is obtained that the indoor coil temperature is higher than the fourth catalytic temperature, the rotation speed of the heat exchange fan is controlled to increase to a maximum value within the rated power range of the heat exchange fan.

[0042] In some embodiments of the present application, the controller is configured to: when it is obtained that the indoor coil temperature is higher than the fourth catalytic temperature, control to reduce the frequency of the compressor.

[0043] In some embodiments of the present application, the controller is configured to: when it is obtained that the indoor coil temperature is not higher than the fourth catalytic temperature, control the frequency of the compressor and the speed of the heat exchange fan to remain unchanged.

[0044] In some embodiments of the present application, the formaldehyde catalytic device includes: a heat-conducting frame and a catalytic coating, the heat-conducting frame includes a clamping portion, the clamping portion is clamped on the refrigerant pipe of the indoor heat exchanger, the heat-conducting frame is abutted against the fins of the indoor heat exchanger, and the catalytic coating is used to catalytically decompose formaldehyde in the air.

[0045] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a schematic diagram of the overall structure of an air conditioner according to one embodiment of the present application;

[0047] Figure 2 The overall structure of the indoor unit of the air conditioner according to one embodiment of the present application is shown in FIG. Figure 1 ;

[0048] Figure 3 The overall structure of the indoor unit of the air conditioner according to one embodiment of the present application is shown in FIG. Figure 2 ;

[0049] Figure 4 is a schematic diagram of the position of a formaldehyde catalytic module according to one embodiment of the present application;

[0050] Figure 5 is a hardware configuration block diagram according to one embodiment of the present application;

[0051] Figure 6 The control process of the air conditioner purification mode according to one embodiment of the present application is Figure 1 ;

[0052] Figure 7 The control process of the air conditioner purification mode according to one embodiment of the present application is Figure 2 ;

[0053] Figure 8 The control process of the air conditioner purification mode according to one embodiment of the present application is Figure 3 ;

[0054] Fig. 9 The control process of the air conditioner purification mode according to one embodiment of the present application is Figure 4 ;

[0055] Fig.10The control process of the air conditioner purification mode according to one embodiment of the present application is Figure 5 .

[0056] In the above figures: 100, air conditioner indoor unit; 200, air conditioner outdoor unit; 11, casing air inlet; 13, casing air outlet; 2, indoor heat exchanger; 3, fresh air module; 4, formaldehyde catalytic device; 5, heat exchange drive motor; 71, controller; 81, bus; 82, memory; 83, processor; 84, communication interface. DETAILED DESCRIPTION

[0057] In the description of the present invention, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0058] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0060] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0061] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0062] In the present application, the air conditioner includes an air conditioner indoor unit 100 and an air conditioner outdoor unit 200. When the air conditioner operates in a cooling mode, the air conditioner performs a refrigeration cycle of the air conditioner indoor unit 100 by using a compressor, an outdoor heat exchanger, an expansion valve and an indoor heat exchanger 2.

[0063] The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air, provides cooling to the indoor space through the heat absorption process of the refrigerant, and achieves temperature regulation of the indoor space.

[0064] The compressor compresses the low-temperature and low-pressure refrigerant gas and discharges the high-temperature and high-pressure refrigerant gas, which flows into the outdoor heat exchanger. The outdoor heat exchanger condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0065] The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the outdoor heat exchanger into a low-pressure liquid-phase refrigerant.

[0066] The indoor heat exchanger 2 evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low temperature and low pressure state to the compressor. The indoor heat exchanger 2 can achieve a cooling effect by using the latent heat of evaporation of the refrigerant to exchange heat with the indoor air.

[0067] During the entire refrigeration cycle, the air conditioner indoor unit 100 can adjust the temperature of the indoor space.

[0068] When the air conditioner operates in a heating mode, the air conditioner performs a heating cycle of the air conditioner indoor unit 100 through the compressor, the outdoor heat exchanger, the expansion valve and the indoor heat exchanger 2 .

[0069] The heating cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air, provides heat to the indoor space through the heat release process of the refrigerant, and realizes temperature regulation of the indoor space.

[0070] When the heating cycle is running, the compressor compresses the refrigerant gas in a low-temperature and low-pressure state and discharges the refrigerant gas in a high-temperature and high-pressure state, and the discharged refrigerant gas flows into the indoor heat exchanger 2. The indoor heat exchanger 2 condenses the compressed refrigerant into a liquid phase, and the heat generated by the condensation is heat-exchanged with the indoor air flowing through the indoor heat exchanger 2, thereby increasing the indoor temperature.

[0071] The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the outdoor heat exchanger into a low-pressure liquid-phase refrigerant.

[0072] The outdoor heat exchanger evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low temperature and low pressure state to the compressor. The outdoor heat exchanger may perform heat exchange with outdoor air by utilizing latent heat of evaporation of the refrigerant.

[0073] During the entire heating cycle, the air conditioner indoor unit 100 can adjust the temperature of the indoor space.

[0074] The air conditioner outdoor unit 200 includes at least a compressor and an outdoor heat exchanger, the air conditioner indoor unit 100 includes at least an indoor heat exchanger 2 , and an expansion valve may be provided in the air conditioner indoor unit 100 or the air conditioner outdoor unit 200 .

[0075] The indoor heat exchanger 2 and the outdoor heat exchanger are used as a condenser or an evaporator. When the indoor heat exchanger 2 is used as a condenser, the air conditioner indoor unit 100 is used as a heater in a heating mode, and when the indoor heat exchanger 2 is used as an indoor heat exchanger 2, the air conditioner indoor unit 100 is used as a cooler in a cooling mode.

[0076] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0077] As attached Figures 1 to 10 As shown, in one embodiment of the air conditioner of the present invention.

[0078] The air conditioner includes an air conditioner indoor unit 100 and an air conditioner outdoor unit 200 . The air conditioner outdoor unit 200 includes a compressor and an outdoor heat exchanger. The air conditioner indoor unit 100 includes an indoor heat exchanger 2 . The expansion valve can be provided in the air conditioner indoor unit 100 or the air conditioner outdoor unit 200 .

[0079] The air conditioner of the present application includes an indoor heat exchanger 2, an outdoor heat exchanger, a compressor, an expansion valve, and a pipeline for circulating refrigerant, and the indoor heat exchanger 2 and the outdoor heat exchanger are both connected to the compressor. The expansion valve is an electronic expansion valve, which is connected between the indoor heat exchanger 2 and the outdoor heat exchanger and can expand the liquid refrigerant that has undergone the condensation process into a low-pressure liquid refrigerant.

[0080] The compressor includes an air intake port and an air exhaust port. The refrigerant that absorbs heat and undergoes an evaporation process enters the compressor from the air intake port. The compressor compresses the gaseous refrigerant into a high-temperature and high-pressure state and then discharges it from the exhaust port.

[0081] The indoor heat exchanger 2 and the outdoor heat exchanger are respectively connected to the compressor through a four-way valve in the refrigerant circuit, and the four-way valve includes a first valve port, a second valve port, a third valve port and a fourth valve port. Among them, the air intake port of the compressor is fixedly connected to the first valve port, and the air discharge port of the compressor is fixedly connected to the third valve port.

[0082] In the refrigerant circuit, the refrigerant can circulate sequentially through the compressor, the indoor heat exchanger 2, the expansion valve, and the outdoor heat exchanger.

[0083] When the air conditioner is in cooling mode, the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port. When the air conditioner is in heating mode, the first valve port is connected to the fourth valve port, and the second valve port is connected to the third valve port.

[0084] In some embodiments, the air conditioning indoor unit 100 further includes: a shell, an indoor heat exchanger 2 , a heat exchange fan and a fresh air module 3 .

[0085] The shell forms the overall appearance of the air-conditioning indoor unit 100, and the indoor heat exchanger 2, the heat exchange fan and the fresh air fan are arranged inside the shell.

[0086] The housing is provided with a housing air inlet 11, an outdoor air inlet, a housing air outlet 13 and a fresh air outlet.

[0087] The indoor heat exchanger 2 is arranged inside the shell, and the refrigerant flowing inside it exchanges heat with the indoor air to form a heating cycle or a cooling cycle. After flowing through the indoor heat exchanger 2, the indoor air flows to the outside of the shell through the casing air outlet 13.

[0088] The heat exchange fan can be a cross-flow fan. When the heat exchange fan is started, the indoor air is introduced into the housing through the drive of the heat exchange fan. The heat exchange fan is used to provide power for the indoor air to flow from the housing air inlet 11 through the housing to the housing air outlet 13. The heat exchange fan includes a heat exchange fan and a heat exchange drive motor 5. The heat exchange drive motor 5 drives the heat exchange fan to rotate.

[0089] Indoor air enters the housing through the housing air inlet 11, exchanges heat with the heat exchanger, and then flows out from the housing air outlet 13 on the housing to the indoor space, thereby supplying indoor air.

[0090] In some embodiments, the air conditioning indoor unit 100 further includes a fresh air module 3, which is disposed in the space inside the housing of the air conditioning indoor unit 100. The fresh air module 3 includes a fresh air fan housing, on which a fresh air inlet and a fresh air outlet are disposed, and the fresh air inlet is connected to the outdoor air inlet on the housing correspondingly, and a fresh air cavity connecting the fresh air inlet and the fresh air outlet is formed in the fresh air module 3. The fresh air inlet can be disposed at the top, front side, rear side, left side or right side of the fresh air fan housing, and correspondingly, the outdoor air inlet can be disposed at the top, front side, rear side, left side or right side of the housing corresponding to the fresh air inlet.

[0091] The fresh air outlet can be arranged around the air conditioning outlet of the housing, so that the fresh air can be mixed with the air conditioning air flowing out of the housing outlet 13 when flowing out of the fresh air outlet, so as to reduce the influence of the fresh air on the temperature and humidity of the indoor environment, and improve the comfort of people when using the fresh air module 3. It can be arranged that the fresh air outlet can also be arranged on the top, front side, rear side, left side or right side of the housing.

[0092] The fresh air module 3 includes a fresh air fan arranged in the fresh air cavity. The fresh air fan can be a centrifugal fan. When the fresh air fan is started, outdoor air is introduced into the room through the fresh air module 3. The fresh air fan is used to provide power for fresh air to flow from the fresh air inlet to the fresh air outlet. The fresh air fan includes a fan and a drive motor. The drive motor drives the fan to rotate.

[0093] The fresh air module 3 also includes a fresh air duct connecting indoor and outdoor, and the fresh air duct is correspondingly arranged at the outdoor air inlet.

[0094] In some embodiments, the fresh air duct is installed in the duct installation hole opened on the wall, one end of the fresh air duct faces indoors and is connected to the fresh air inlet of the fresh air module 3, the other end of the fresh air duct faces outdoors and is provided with an air inlet, and the fresh air duct is connected to the outdoors through the air inlet. Under the action of the fresh air fan, the outdoor fresh air enters the indoor fresh air module 3 from the outdoors along the fresh air duct, and is blown into the indoor from the fresh air outlet, thereby introducing outdoor fresh air into the indoor.

[0095] In addition, the air conditioner is provided with a controller 71 to control the operation of various components in the air conditioner so that the various components of the air conditioner can operate to realize various predetermined functions of the air conditioner. The controller 71 refers to a device that can generate an operation control signal according to the instruction operation code and the timing signal to instruct the air conditioner to execute the control instruction. For example, in response to a power-on or power-off instruction received from a user, the controller 71 can perform an operation related to the object selected by the power-on or power-off instruction.

[0096] The air conditioner is also provided with a control device, which is exemplarily a remote controller, which has the function of communicating with the controller 71 using infrared or other communication methods. The remote controller is used for the user to perform various controls on the air conditioner and realize the interaction between the user and the air conditioner.

[0097] The embodiment of the present application also provides a hardware structure diagram of a controller 71, the controller 71 includes a processor 83, and optionally, also includes a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, the memory 82 and the communication interface 84 are connected via a bus 81.

[0098] The processor 83 may be a central processing unit 83 (CPU), a general processor 83, a network processor 83 (NP), a digital signal processor 83 (DSP), a microprocessor 83, a microcontroller 718, a programmable logic device (PLD), or any combination thereof. The processor 83 may also be any other device having a processing function, such as a circuit, a device, or a software module. The processor 83 may also include multiple CPUs, and the processor 83 may be a single-CPU processor 83 or a multi-CPU processor 83. The processor 83 here may refer to one or more devices, circuits, or processing cores for processing data (such as computer program instructions).

[0099] The memory 82 may be a read-only memory 82 (ROM) or other types of static storage devices that can store static information and instructions, a random access memory 82 (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory 82 (EEPROM) read-only compact disc (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), magnetic disk storage medium or other magnetic storage device or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, and the embodiment of the present application does not impose any restrictions on this. The memory 82 may exist independently or be integrated with the processor 83. Among them, the memory 82 may contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, so as to realize the control method of the air conditioner provided in the embodiment of the present application.

[0100] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. The communication interface 84 can be a module, a circuit, a transceiver or any device that can achieve communication.

[0101] The bus 81 may be a peripheral component interconnect (PCI) bus 81 or an extended industry standard architecture (EISA) bus 81. The bus 81 may be divided into an address bus 81, a data bus 81, a control bus 81, etc. Figure 5 Only one thick line is used in the figure, but it does not mean that there is only one bus 81 or only one type of bus 81.

[0102] In some embodiments, the air conditioner further comprises an indoor coil sensor, which is disposed on the indoor heat exchanger 2 and is used to detect the indoor coil temperature. The indoor coil sensor is electrically connected to the controller 71, and the indoor coil temperature sensor sends the detected indoor coil temperature to the controller 71 in the form of an electrical signal. The controller 71 is used to control the frequency of the compressor and the speed of the heat exchange fan according to the detection signal sent by the indoor coil temperature sensor.

[0103] The formaldehyde catalytic device 4 is disposed on the air inlet side of the indoor heat exchanger 2 . The formaldehyde catalytic device 4 is connected to the indoor heat exchanger 2 . The formaldehyde catalytic device 4 is used for catalytically decomposing formaldehyde.

[0104] The formaldehyde catalytic device 4 comprises: a heat-conducting frame and a catalytic coating, wherein the heat-conducting frame comprises a clamping portion, and the clamping portion and the heat-conducting frame are detachably connected or integrally formed.

[0105] The clamping part is clamped on the refrigerant pipe of the indoor heat exchanger 2, the heat conducting frame is in contact with the fin of the indoor heat exchanger 2, the catalytic coating can be arranged on the side of the heat conducting frame away from the indoor heat exchanger 2, and the catalytic coating is attached to the heat conducting frame, which is conducive to heat conduction from the indoor heat exchanger 2 to the catalytic coating directly through the heat conducting frame, and the efficiency of the catalytic coating in catalytically decomposing formaldehyde is improved by controlling the indoor coil temperature of the indoor heat exchanger 2. The refrigerant pipe of the indoor heat exchanger 2 can be made of copper pipe or aluminum pipe, and the fin can be made of aluminum.

[0106] In some embodiments, the catalytic coating may use a surface catalyst, and the surface catalyst may be a manganese-based catalyst, a zinc-based catalyst, a precious metal catalyst, etc. to facilitate the catalytic decomposition of formaldehyde.

[0107] In some embodiments, the formaldehyde catalytic device 4 can be provided as an independent component for later installation, and the formaldehyde catalytic device 4 can be mounted on the indoor heat exchanger 2 as an optional component. The independent installation of the formaldehyde catalytic device 4 makes it less likely to cause the catalytic coating attached thereto to fall off during transportation with the air conditioner, and at the same time, there is no need to increase the material cost of the conventional air conditioner base, nor will it affect the universal material setting.

[0108] The formaldehyde catalytic device 4 is set as an independent component. On the basis of the universal setting of the air conditioner, the formaldehyde catalytic device 4 can be installed without changing the basic model structure. It can be applied to universal air conditioners, does not need to adjust the processing technology of the air conditioner structure, and will not affect the manufacturing efficiency of the air conditioner.

[0109] In some embodiments, when the user turns on the purification mode, the controller 71 receives a first signal. If the indoor heat exchanger 2 of the air-conditioning indoor unit 100 is working as an evaporator at this time, the controller 71 controls the indoor heat exchanger 2 to switch to a condenser to work. It can also be understood that when the user turns on the purification mode, if the air conditioner is running in cooling mode at this time, the controller 71 controls the air conditioner to switch to heating mode.

[0110] The controller 71 is configured as follows: when the controller 71 receives the first signal, the controller 71 controls the indoor heat exchanger 2 to work as a condenser, controls the compressor and the outdoor fan to start running, and controls the heat exchange fan to stop running.

[0111] The compressor and the outdoor fan are turned on and running, which is beneficial to the heat exchange between the outdoor heat exchanger and the outdoor air. The heat exchange fan stops running, which is beneficial to the rapid improvement of the heating effect of the indoor heat exchanger 2. The heat of the indoor heat exchanger 2 is transferred to the catalytic coating of the formaldehyde catalytic device 4 through the heat conduction frame, which is beneficial to the rapid heating of the catalytic coating on the formaldehyde catalytic module and improves the catalytic decomposition rate of the catalytic coating on indoor formaldehyde.

[0112] In some embodiments, when the user turns on the purification mode, the controller 71 receives the first signal, and the controller 71 controls the air conditioner to issue a warning prompt, which includes a voice reminder or a text prompt of the intelligent interconnection software to remind the user that the comfort effect of the air conditioner's cooling and heating may be affected when the purification mode is running. This is because the enhanced purification effect of turning on the purification mode will force the heating mode to be executed, and the speed of the heat exchange fan will be increased, which may affect the comfort of the indoor environment.

[0113] When the user receives the warning prompt and chooses to continue running the purification mode, the controller 71 controls the indoor heat exchanger 2 to switch to the condenser to work.

[0114] When the user receives the warning prompt and chooses not to run the purification mode, the controller 71 controls the air conditioner to continue running in the current working mode.

[0115] In some embodiments, when the controller 71 receives the first signal and controls the indoor heat exchanger 2 to work as a condenser, it detects whether the running time reaches the set time. When the set time is reached, the running mode is switched. When the running time is not reached, the purification mode is maintained and continued to run.

[0116] The air conditioner can be controlled to exit the purification mode by controlling whether the air conditioner runs in the purification mode for a preset time. After the purification mode runs for a preset time, the indoor formaldehyde concentration has decreased. If the formaldehyde removal efficiency is low if the purification mode continues to run, exiting the purification mode can reduce the energy consumption of the air conditioner.

[0117] In some embodiments, during the purification mode operation, the indoor heat exchanger 2 operates as a condenser, and the indoor coil sensor transmits the detected indoor coil temperature to the controller 71 in the form of an electrical signal.

[0118] When the controller 71 obtains that the indoor coil temperature is higher than the first catalytic temperature, the operating frequency of the compressor is controlled to be reduced, and the speed of the heat exchange fan is controlled to be increased. When the controller 71 obtains that the indoor coil temperature is lower than the second catalytic temperature, the frequency of the compressor is controlled to be increased, and the speed of the heat exchange fan is controlled to be reduced.

[0119] When the temperature of the indoor heat exchanger 2 is too high, the temperature of the formaldehyde catalytic module is roughly the same as the temperature of the indoor heat exchanger 2. At this time, the excessively high temperature will make the performance of the formaldehyde catalytic module in catalyzing and decomposing formaldehyde not significantly improved. At the same time, the temperature of the indoor heat exchanger 2 of the air conditioner is high, which makes the operating power of the air conditioner high and it is difficult to meet the energy-saving operation requirements.

[0120] Therefore, a first catalytic temperature and a second catalytic temperature are set in the air conditioner, and the first catalytic temperature is higher than the second catalytic temperature. When the temperature of the formaldehyde catalytic module is between the second catalytic temperature and the first catalytic temperature, the formaldehyde catalytic module has a higher efficiency in catalytically decomposing formaldehyde.

[0121] In the air conditioner of the present invention, when the indoor coil temperature is higher than the first catalytic temperature, it is equivalent to that the temperature of the formaldehyde catalytic module is higher than the first catalytic temperature. By reducing the operating frequency of the compressor to reduce the heating effect of the indoor heat exchanger 2, and at the same time controlling and increasing the speed of the heat exchange fan, the indoor heat exchanger 2 and the indoor air can quickly exchange heat, thereby improving the heat dissipation effect of the indoor heat exchanger 2, thereby reducing the temperature of the formaldehyde catalytic module to below the first catalytic temperature, and improving the catalytic decomposition performance of the formaldehyde catalytic module.

[0122] When the indoor coil temperature is lower than the first catalytic temperature, it is equivalent to that the temperature of the formaldehyde catalytic module is lower than the first catalytic temperature. By increasing the operating frequency of the compressor to improve the heating effect of the indoor heat exchanger 2, and reducing the speed of the heat exchange fan to reduce the heat exchange between the indoor heat exchanger 2 and the indoor air, reducing the heat dissipation effect of the indoor heat exchanger 2, and then increasing the temperature of the formaldehyde catalytic module to not lower than the second catalytic temperature, and improving the catalytic decomposition performance of the formaldehyde catalytic module.

[0123] In some embodiments, during the purification mode operation, the indoor heat exchanger 2 operates as a condenser, and the indoor coil sensor transmits the detected indoor coil temperature to the controller 71 in the form of an electrical signal.

[0124] When the controller 71 obtains that the indoor coil temperature is higher than the third catalytic temperature, the heat exchange fan is controlled to start running at the first speed. When the controller 71 obtains that the indoor coil temperature is not higher than the third catalytic temperature, the heat exchange fan is controlled to stop running. The first speed is the speed when the heat exchange fan is running below the maximum value of its rated power range.

[0125] A third catalytic temperature and a fourth catalytic temperature are set in the air conditioner, and the fourth catalytic temperature is higher than the third catalytic temperature. When the temperature of the formaldehyde catalytic module is between the third catalytic temperature and the fourth catalytic temperature, the formaldehyde catalytic module has a higher efficiency in catalytically decomposing formaldehyde.

[0126] In the air conditioner of the present invention, when the indoor coil temperature is higher than the third catalytic temperature, it is equivalent to that the temperature of the formaldehyde catalytic module is higher than the third catalytic temperature. By controlling the heat exchange fan to operate at the first speed, the indoor air flows through the indoor heat exchanger 2 and the formaldehyde catalytic device 4, and the formaldehyde in the indoor air is catalytically decomposed by the formaldehyde catalytic device 4, thereby playing a role in purifying formaldehyde.

[0127] When the indoor coil temperature is not higher than the third catalytic temperature, it is equivalent to that the temperature of the formaldehyde catalytic module is not higher than the third catalytic temperature. By controlling the heat exchange fan to stop running, the heat dissipation effect of the indoor heat exchanger 2 is reduced, and the temperature of the indoor heat exchanger 2 is promoted to rise rapidly, thereby increasing the temperature of the formaldehyde catalytic module to higher than the third catalytic temperature, and improving the catalytic decomposition performance of the formaldehyde catalytic module.

[0128] In some embodiments, when the controller 71 obtains that the indoor coil temperature is not higher than the fourth catalytic temperature, the heat exchange fan is controlled to run at the current speed. When the controller 71 obtains that the indoor coil temperature is higher than the fourth catalytic temperature, the speed of the heat exchange fan is controlled to increase to the maximum value of the rated power range of the heat exchange fan. The fourth catalytic temperature is higher than the third catalytic temperature.

[0129] When the indoor coil temperature is not higher than the fourth catalytic temperature, which is equivalent to the temperature of the formaldehyde catalytic module being not higher than the fourth catalytic temperature, the controller 71 controls the heat exchange fan to run at the current speed, which is beneficial to ensure that the indoor coil temperature is between the third catalytic temperature and the fourth catalytic temperature, thereby improving the catalytic decomposition efficiency of the formaldehyde catalytic device 4 on formaldehyde in the indoor air.

[0130] When the indoor coil temperature is higher than the fourth catalytic temperature, it is equivalent to that the temperature of the formaldehyde catalytic module is higher than the fourth catalytic temperature. At this time, the temperature of the formaldehyde catalytic module is higher than the optimal temperature range of its catalytic decomposition of formaldehyde. The controller 71 controls the speed of the heat exchange fan to increase to the maximum value of the rated power range of the heat exchange fan, which can improve the heat exchange efficiency between the indoor air and the indoor heat exchanger 2, thereby reducing the temperature of the indoor heat exchanger 2 and the formaldehyde catalytic module, so that the temperature of the formaldehyde catalytic module is reduced to no higher than the fourth catalytic temperature, thereby improving the performance of the formaldehyde catalytic module.

[0131] In some embodiments, when the controller 71 obtains that the indoor coil temperature is higher than the fourth catalytic temperature, the frequency of the compressor is controlled to be reduced. When the controller 71 obtains that the indoor coil temperature is not higher than the fourth catalytic temperature, the frequency of the compressor and the speed of the heat exchange fan are controlled to remain unchanged.

[0132] When the indoor coil temperature is not higher than the fourth catalytic temperature, it is equivalent to that the temperature of the formaldehyde catalytic module is not higher than the fourth catalytic temperature. At this time, the frequency of the compressor and the speed of the heat exchange fan are controlled to remain unchanged, which is conducive to ensuring that the indoor coil temperature is between the third catalytic temperature and the fourth catalytic temperature, and improving the catalytic decomposition efficiency of the formaldehyde catalytic device 4 on formaldehyde in the indoor air.

[0133] When the indoor coil temperature is higher than the fourth catalytic temperature, it is equivalent to that the temperature of the formaldehyde catalytic module is higher than the fourth catalytic temperature. At this time, the temperature of the formaldehyde catalytic module is higher than the optimal temperature range for catalytic decomposition of formaldehyde. The controller 71 controls the compressor frequency to reduce the heating efficiency of the indoor heat exchanger 2, reduce the temperature of the indoor heat exchanger 2, and then reduce the temperature of the formaldehyde catalytic module, so that the temperature of the formaldehyde catalytic module is reduced to no higher than the fourth catalytic temperature, thereby improving the performance of the formaldehyde catalytic module.

[0134] When the controller 71 obtains that the indoor coil temperature is higher than the fourth catalytic temperature, in the step of controlling the frequency reduction of the compressor, the controller 71 controls the frequency of the compressor to periodically reduce the first preset frequency. It can be set that the first preset frequency can be set to 5Hz, and the compressor is reduced at a rate of 5Hz / min, which can prevent the compressor frequency from changing too much and causing the compressor service life to be reduced.

[0135] In some embodiments, the controller 71 is simultaneously provided with a first catalytic temperature, a second catalytic temperature, a third catalytic temperature and a fourth catalytic temperature.

[0136] When the controller 71 obtains that the indoor coil temperature is higher than the first catalytic temperature, the operating frequency of the compressor is controlled to be reduced, and the speed of the heat exchange fan is controlled to be increased. When the controller 71 obtains that the indoor coil temperature is lower than the second catalytic temperature, the frequency of the compressor is controlled to be increased, and the speed of the heat exchange fan is controlled to be reduced.

[0137] When the temperature of the indoor heat exchanger 2 is too high, the temperature of the formaldehyde catalytic module is roughly the same as the temperature of the indoor heat exchanger 2. At this time, the excessively high temperature will make the performance of the formaldehyde catalytic module in catalyzing and decomposing formaldehyde not significantly improved. At the same time, the temperature of the indoor heat exchanger 2 of the air conditioner is high, which makes the operating power of the air conditioner high and it is difficult to meet the energy-saving operation requirements.

[0138] Therefore, a first catalytic temperature and a second catalytic temperature are set in the air conditioner, and the first catalytic temperature is higher than the second catalytic temperature. When the temperature of the formaldehyde catalytic module is between the second catalytic temperature and the first catalytic temperature, the formaldehyde catalytic module has a higher efficiency in catalytically decomposing formaldehyde.

[0139] In the air conditioner of the present invention, when the indoor coil temperature is higher than the first catalytic temperature, it is equivalent to that the temperature of the formaldehyde catalytic module is higher than the first catalytic temperature. By reducing the operating frequency of the compressor to reduce the heating effect of the indoor heat exchanger 2, and at the same time controlling and increasing the speed of the heat exchange fan, the indoor heat exchanger 2 and the indoor air can quickly exchange heat, thereby improving the heat dissipation effect of the indoor heat exchanger 2, thereby reducing the temperature of the formaldehyde catalytic module to below the first catalytic temperature, and improving the catalytic decomposition performance of the formaldehyde catalytic module.

[0140] When the indoor coil temperature is lower than the first catalytic temperature, it is equivalent to that the temperature of the formaldehyde catalytic module is lower than the first catalytic temperature. By increasing the operating frequency of the compressor to improve the heating effect of the indoor heat exchanger 2, and reducing the speed of the heat exchange fan to reduce the heat exchange between the indoor heat exchanger 2 and the indoor air, reducing the heat dissipation effect of the indoor heat exchanger 2, and then increasing the temperature of the formaldehyde catalytic module to not lower than the second catalytic temperature, and improving the catalytic decomposition performance of the formaldehyde catalytic module.

[0141] In some embodiments, during the purification mode operation, the indoor heat exchanger 2 operates as a condenser, and the indoor coil sensor transmits the detected indoor coil temperature to the controller 71 in the form of an electrical signal.

[0142] When the controller 71 obtains that the indoor coil temperature is higher than the third catalytic temperature, the heat exchange fan is controlled to start running at the first speed. When the controller 71 obtains that the indoor coil temperature is not higher than the third catalytic temperature, the heat exchange fan is controlled to stop running. The first speed is the speed when the heat exchange fan is running below the maximum value of its rated power range.

[0143] A third catalytic temperature and a fourth catalytic temperature are set in the air conditioner, and the fourth catalytic temperature is higher than the third catalytic temperature. When the temperature of the formaldehyde catalytic module is between the third catalytic temperature and the fourth catalytic temperature, the formaldehyde catalytic module has a higher efficiency in catalytically decomposing formaldehyde. The third catalytic temperature is not higher than the first catalytic temperature, the third catalytic temperature is not lower than the second catalytic temperature, the fourth catalytic temperature is not lower than the first catalytic temperature, and the fourth catalytic temperature is higher than the third catalytic temperature.

[0144] In the air conditioner of the present invention, when the indoor coil temperature is higher than the third catalytic temperature, it is equivalent to that the temperature of the formaldehyde catalytic module is higher than the third catalytic temperature. By controlling the heat exchange fan to operate at the first speed, the indoor air flows through the indoor heat exchanger 2 and the formaldehyde catalytic device 4, and the formaldehyde in the indoor air is catalytically decomposed by the formaldehyde catalytic device 4, thereby playing a role in purifying formaldehyde.

[0145] When the indoor coil temperature is not higher than the third catalytic temperature, it is equivalent to that the temperature of the formaldehyde catalytic module is not higher than the third catalytic temperature. By controlling the heat exchange fan to stop running, the heat dissipation effect of the indoor heat exchanger 2 is reduced, and the temperature of the indoor heat exchanger 2 is promoted to rise rapidly, thereby increasing the temperature of the formaldehyde catalytic module to higher than the third catalytic temperature, and improving the catalytic decomposition performance of the formaldehyde catalytic module.

[0146] In some embodiments, when the controller 71 obtains that the indoor coil temperature is not higher than the fourth catalytic temperature, the heat exchange fan is controlled to run at the current speed. When the controller 71 obtains that the indoor coil temperature is higher than the fourth catalytic temperature, the speed of the heat exchange fan is controlled to increase to the maximum value of the rated power range of the heat exchange fan. The fourth catalytic temperature is higher than the third catalytic temperature.

[0147] When the indoor coil temperature is not higher than the fourth catalytic temperature, which is equivalent to the temperature of the formaldehyde catalytic module being not higher than the fourth catalytic temperature, the controller 71 controls the heat exchange fan to run at the current speed, which is beneficial to ensure that the indoor coil temperature is between the third catalytic temperature and the fourth catalytic temperature, thereby improving the catalytic decomposition efficiency of the formaldehyde catalytic device 4 on formaldehyde in the indoor air.

[0148] When the indoor coil temperature is higher than the fourth catalytic temperature, it is equivalent to that the temperature of the formaldehyde catalytic module is higher than the fourth catalytic temperature. At this time, the temperature of the formaldehyde catalytic module is higher than the optimal temperature range of its catalytic decomposition of formaldehyde. The controller 71 controls the speed of the heat exchange fan to increase to the maximum value of the rated power range of the heat exchange fan, which can improve the heat exchange efficiency between the indoor air and the indoor heat exchanger 2, thereby reducing the temperature of the indoor heat exchanger 2 and the formaldehyde catalytic module, so that the temperature of the formaldehyde catalytic module is reduced to no higher than the fourth catalytic temperature, thereby improving the performance of the formaldehyde catalytic module.

[0149] In some embodiments, when the controller 71 obtains that the indoor coil temperature is higher than the fourth catalytic temperature, the frequency of the compressor is controlled to be reduced. When the controller 71 obtains that the indoor coil temperature is not higher than the fourth catalytic temperature, the frequency of the compressor and the speed of the heat exchange fan are controlled to remain unchanged.

[0150] When the indoor coil temperature is not higher than the fourth catalytic temperature, it is equivalent to that the temperature of the formaldehyde catalytic module is not higher than the fourth catalytic temperature. At this time, the frequency of the compressor and the speed of the heat exchange fan are controlled to remain unchanged, which is conducive to ensuring that the indoor coil temperature is between the third catalytic temperature and the fourth catalytic temperature, and improving the catalytic decomposition efficiency of the formaldehyde catalytic device 4 on formaldehyde in the indoor air.

[0151] When the indoor coil temperature is higher than the fourth catalytic temperature, it is equivalent to that the temperature of the formaldehyde catalytic module is higher than the fourth catalytic temperature. At this time, the temperature of the formaldehyde catalytic module is higher than the optimal temperature range for catalytic decomposition of formaldehyde. The controller 71 controls the compressor frequency to reduce the heating efficiency of the indoor heat exchanger 2, reduce the temperature of the indoor heat exchanger 2, and then reduce the temperature of the formaldehyde catalytic module, so that the temperature of the formaldehyde catalytic module is reduced to no higher than the fourth catalytic temperature, thereby improving the performance of the formaldehyde catalytic module.

[0152] When the controller 71 obtains that the indoor coil temperature is higher than the fourth catalytic temperature, in the step of controlling the frequency reduction of the compressor, the controller 71 controls the frequency of the compressor to periodically reduce the first preset frequency. It can be set that the first preset frequency can be set to 5Hz, and the compressor is reduced at a rate of 5Hz / min, which can prevent the compressor frequency from changing too much and causing the compressor service life to be reduced.

[0153] In some embodiments, the air conditioner further includes a human sensor, which is used to detect whether there is someone in the room. When the human sensor detects that there is someone in the room during the purification mode, the controller 71 can control the air conditioner to issue a warning prompt to remind the user to leave the room. Or when the human sensor detects that there is someone in the room during the purification mode, the controller 71 can control the exit of the purification mode to avoid the release of formaldehyde in the indoor furniture into the air due to heating, which makes the indoor formaldehyde concentration too high and affects the health of users.

[0154] In some embodiments, the air conditioner further includes a formaldehyde concentration detection device. When the formaldehyde concentration detection device detects that the indoor formaldehyde concentration is higher than a preset value, the controller 71 actively controls the start of the purification mode to remove formaldehyde.

[0155] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An air conditioner, characterized in that: include: Air conditioner indoor unit and air conditioner outdoor unit; The air conditioner indoor unit comprises: A housing, comprising at least a heat exchange air inlet and a heat exchange air outlet; An indoor heat exchanger is arranged inside the shell, and the refrigerant flowing inside the indoor heat exchanger exchanges heat with the indoor air to form a heating cycle or a cooling cycle. The indoor air enters the shell through the heat exchange air inlet, exchanges heat with the indoor heat exchanger, and flows to the outside of the shell through the heat exchange air outlet; A heat exchange fan, used to drive the indoor air to be transported to the indoor through the heat exchange air outlet; A formaldehyde catalytic device is arranged on the air inlet side of the indoor heat exchanger, the formaldehyde catalytic device is connected to the indoor heat exchanger, and the formaldehyde catalytic device is used to catalytically decompose formaldehyde; An indoor coil sensor is arranged on the indoor heat exchanger and is used to detect the indoor coil temperature; The air conditioner outdoor unit at least comprises a compressor, and the compressor is connected to the indoor heat exchanger via a refrigerant circuit; The controller is configured as: The indoor heat exchanger works as a condenser, and when it is obtained that the temperature of the indoor coil is higher than the first catalytic temperature, the operating frequency of the compressor is controlled to be reduced, and the speed of the heat exchange fan is controlled to be increased; When it is obtained that the indoor coil temperature is lower than the second catalytic temperature, the frequency of the compressor is controlled to be increased, and the speed of the heat exchange fan is controlled to be reduced.

2. The air conditioner according to claim 1, characterized in that: The controller is configured to: The indoor heat exchanger works as a condenser, and when it is obtained that the indoor coil temperature is higher than the third catalytic temperature, the heat exchange fan is controlled to start running at the first speed; When it is obtained that the indoor coil temperature is not higher than the third catalytic temperature, the heat exchange fan is controlled to stop running.

3. The air conditioner according to claim 2, characterized in that: The third catalytic temperature is not higher than the first catalytic temperature, and the third catalytic temperature is not lower than the second catalytic temperature.

4. The air conditioner according to claim 2, characterized in that: The controller is configured to: When it is obtained that the indoor coil temperature is higher than the fourth catalytic temperature, controlling the frequency of the compressor to periodically reduce a first preset frequency; When it is obtained that the indoor coil temperature is not higher than the fourth catalytic temperature, the frequency of the compressor and the speed of the heat exchange fan are controlled to remain unchanged.

5. The air conditioner according to claim 4, characterized in that: The fourth catalytic temperature is not lower than the first catalytic temperature, and the fourth catalytic temperature is higher than the third catalytic temperature.

6. An air conditioner, characterized in that: include: Air conditioner indoor unit and air conditioner outdoor unit; The air conditioner indoor unit comprises: A housing, comprising at least a heat exchange air inlet and a heat exchange air outlet; An indoor heat exchanger is arranged inside the shell, and the refrigerant flowing inside the indoor heat exchanger exchanges heat with the indoor air to form a heating cycle or a cooling cycle. The indoor air enters the shell through the heat exchange air inlet, exchanges heat with the indoor heat exchanger, and flows to the outside of the shell through the heat exchange air outlet; A heat exchange fan, used to drive the indoor air to be transported to the indoor through the heat exchange air outlet; A formaldehyde catalytic device is arranged on the air inlet side of the indoor heat exchanger, the formaldehyde catalytic device is connected to the indoor heat exchanger, and the formaldehyde catalytic device is used to catalytically decompose formaldehyde; An indoor coil sensor is arranged on the indoor heat exchanger and is used to detect the indoor coil temperature; The air conditioner outdoor unit at least comprises a compressor, and the compressor is connected to the indoor heat exchanger via a refrigerant circuit; The controller is configured as: The indoor heat exchanger works as a condenser, and when it is obtained that the indoor coil temperature is higher than the third catalytic temperature, the heat exchange fan is controlled to start running at the first speed; When it is obtained that the indoor coil temperature is not higher than the third catalytic temperature, the heat exchange fan is controlled to stop running.

7. The air conditioner according to claim 6, characterized in that: The controller is configured to: when it is obtained that the indoor coil temperature is not higher than the fourth catalytic temperature, control the heat exchange fan to operate at a current speed; When it is obtained that the indoor coil temperature is higher than the fourth catalytic temperature, the rotation speed of the heat exchange fan is controlled to increase to a maximum value within the rated power range of the heat exchange fan.

8. The air conditioner according to claim 7, characterized in that: The controller is configured to control the frequency of the compressor to be reduced when it is obtained that the indoor coil temperature is higher than the fourth catalytic temperature.

9. The air conditioner according to claim 8, characterized in that: The controller is configured to: when it is obtained that the indoor coil temperature is not higher than the fourth catalytic temperature, control the frequency of the compressor and the speed of the heat exchange fan to remain unchanged.

10. The air conditioner according to claim 6, characterized in that: The formaldehyde catalytic device includes: a heat-conducting frame and a catalytic coating, the heat-conducting frame includes a clamping portion, the clamping portion is clamped on the refrigerant pipe of the indoor heat exchanger, the heat-conducting frame is in contact with the fins of the indoor heat exchanger, and the catalytic coating is used for catalytically decomposing formaldehyde in the air.

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