Air conditioner

Abstract

The application relates to an air conditioner, comprising: an air conditioner indoor unit and an air conditioner outdoor unit; the air conditioner indoor unit comprises: a shell; an indoor heat exchanger arranged inside the shell, which exchanges heat between refrigerant flowing inside and indoor air to form a heating cycle or a refrigeration cycle, and the indoor air flows to the outside of the shell through a heat exchange air outlet after heat exchange; a humidifier; an indoor temperature sensor for detecting indoor temperature; an indoor humidity sensor for detecting indoor humidity; the air conditioner outdoor unit at least comprises a compressor which is communicated with the indoor heat exchanger through a refrigerant circuit; and a controller is configured to: when the indoor heat exchanger works as a condenser, control the indoor temperature sensor to detect the indoor temperature, and control the indoor humidity sensor to detect the indoor humidity; when the indoor temperature is lower than a first preset temperature, and the indoor humidity is not lower than a first preset humidity, control the operating frequency of the compressor to be raised, and control the humidifier to be started to improve the formaldehyde release and de-aldehyde effect.

Description

TECHNICAL FIELD

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

[0002] At present, with the improvement of people's living quality and level, health is increasingly valued in the family scene. For the home appliance market, more and more home appliances are developed around the theme of "health". Formaldehyde, as the number one killer affecting the health of the family scene, more and more users begin to seek reliable and effective ways to remove formaldehyde. As a class I carcinogen, formaldehyde exists in two forms in the room: combined formaldehyde in furniture boards and free formaldehyde in indoor air. The combined formaldehyde in furniture boards will gradually release into the air at room temperature, continuously increasing the content of free formaldehyde in the air and exacerbating the threat to human health. There is no mature technology that can completely remove formaldehyde contained in furniture boards in a short time.

[0003] The air conditioner usually includes an air conditioner indoor unit and an air conditioner outdoor unit, and some air conditioners have the function of removing formaldehyde.

[0004] The air conditioner indoor unit includes a shell, an indoor heat exchanger and a formaldehyde removal filter screen, and a heat exchange air outlet is formed on the shell. The indoor heat exchanger is arranged inside the shell, and the refrigerant flowing inside the indoor heat exchanger exchanges heat with indoor air to form a heating cycle or a refrigeration cycle, and the indoor air flows to the outside of the shell after heat exchange through the heat exchange air outlet. The formaldehyde removal filter screen is used to adsorb formaldehyde in indoor air, and the formaldehyde removal filter screen has a service life and needs to be replaced frequently.

[0005] In the related art, indoor air flows through the formaldehyde removal filter screen to remove formaldehyde gas in the indoor air, but the current removal of formaldehyde through the air conditioner indoor unit is single in the way of removing formaldehyde, low in the efficiency of removing formaldehyde, and needs to replace the formaldehyde removal module frequently, which cannot implement different formaldehyde removal ways for different indoor temperatures and indoor humidities. SUMMARY

[0006] The present application at least partly solves one of the problems in the related art.

[0007] To this end, the present application aims to provide an air conditioner to facilitate corresponding formaldehyde removal ways for different indoor temperatures and indoor humidities, and to ensure that the formaldehyde removal effect and the energy consumption of the air conditioner are optimal.

[0008] To achieve the above-mentioned purpose, in one aspect, the present application provides an air conditioner, which comprises:

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

[0010] the air conditioner indoor unit comprises:

[0011] a housing having a heat exchange air outlet;

[0012] an indoor heat exchanger disposed inside the housing, the indoor heat exchanger performing heat exchange between refrigerant flowing inside the indoor heat exchanger and indoor air to form a heating cycle or a cooling cycle, the indoor air flowing to outside of the housing through the heat exchange air outlet after the heat exchange;

[0013] a humidifier disposed in the housing, the humidifier being configured to generate steam, the steam flowing to outside of the housing through the heat exchange air outlet;

[0014] an indoor temperature sensor configured to detect an indoor temperature;

[0015] an indoor humidity sensor configured to detect an indoor humidity;

[0016] an air conditioner outdoor unit including at least a compressor, the compressor being connected to the indoor heat exchanger through a refrigerant circuit;

[0017] the controller is configured to:

[0018] when the indoor heat exchanger is working as a condenser, control the indoor temperature sensor to detect the indoor temperature, and control the indoor humidity sensor to detect the indoor humidity;

[0019] when the indoor temperature is lower than a first preset temperature and the indoor humidity is not lower than a first preset humidity, control the compressor to increase the operating frequency, and control the humidifier to be turned on.

[0020] In the present application, the controller controls the compressor to increase the frequency, thereby increasing the heat exchange amount of the indoor heat exchanger, so that the indoor air is heated by the indoor heat exchanger when the indoor air flows through the indoor heat exchanger, and the heated indoor air flows to the indoor through the heat exchange air outlet, thereby increasing the indoor temperature.

[0021] As the indoor temperature increases, the indoor humidity decreases, and the indoor humidity may be lower than the first preset humidity. When the indoor temperature is lower than the first preset temperature and the indoor humidity is not lower than the first preset humidity, the humidifier is turned on to ensure that the indoor humidity is not lower than the first preset humidity, thereby increasing the release of formaldehyde in the indoor furniture into the air. In combination with increasing the frequency of the compressor to increase the temperature, the release of formaldehyde in the indoor furniture can be further promoted.

[0022] In some embodiments of the present application, the controller is configured to:

[0023] when the indoor heat exchanger is working as a condenser, control the indoor temperature sensor to detect the indoor temperature, and control the indoor humidity sensor to detect the indoor humidity;

[0024] when the indoor temperature is lower than a first preset temperature and the indoor humidity is lower than a first preset humidity, control the compressor to increase the operating frequency, and control the humidifier to be turned on.

[0025] In some embodiments of the present application, the controller is configured to:

[0026] When the indoor heat exchanger works as a condenser, the indoor temperature sensor detects the indoor temperature, and the indoor humidity sensor detects the indoor humidity;

[0027] When the indoor temperature is not lower than the first preset temperature and the indoor humidity is lower than the first preset humidity, the operating frequency of the compressor is unchanged, and the humidifier is controlled to be turned on.

[0028] In some embodiments of the present application, further comprising:

[0029] The heat exchange fan is configured to deliver indoor air to the indoor through the heat exchange air outlet;

[0030] The fresh air fan is configured to deliver outdoor fresh air to the indoor;

[0031] The controller is configured to:

[0032] When the indoor heat exchanger works as a condenser, the indoor temperature sensor detects the indoor temperature, and the indoor humidity sensor detects the indoor humidity;

[0033] When the indoor temperature is not lower than the first preset temperature and the indoor humidity is not lower than the first preset humidity, the operating frequency of the compressor is unchanged, the operating state of the humidifier is unchanged, the heat exchange fan is controlled to operate at the upper limit value of the rated power range of the heat exchange fan, and the fresh air fan is controlled to operate at the upper limit value of the rated power range of the fresh air fan.

[0034] In some embodiments of the present application, the controller is configured to: when the controller obtains that the current date is the preset date, control the indoor heat exchanger to work as a condenser.

[0035] In some embodiments of the present application, further comprising:

[0036] The fresh air fan is configured to deliver outdoor fresh air to the indoor;

[0037] The formaldehyde concentration sensor is configured to detect the indoor formaldehyde concentration;

[0038] The controller is configured to:

[0039] When the indoor temperature is not lower than the first preset temperature and the indoor humidity is not lower than the first preset humidity, after a preset first time, the formaldehyde concentration sensor is controlled to be turned on;

[0040] When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is lower than the second preset concentration, the fresh air fan is controlled to stop operating, and the indoor heat exchanger and the humidifier are maintained in the working state;

[0041] When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is not lower than the preset amplitude of the second preset concentration, the fresh air fan is controlled to be turned on.

[0042] In some embodiments of the present application, further comprising:

[0043] a formaldehyde concentration sensor configured to detect an indoor formaldehyde concentration;

[0044] a fresh air fan configured to deliver outdoor fresh air to the indoor;

[0045] a heat exchange fan configured to deliver indoor air to the indoor through a heat exchange air outlet;

[0046] a human sensor configured to detect whether there is a person in the indoor;

[0047] a controller configured to:

[0048] when the human sensor detects that there is a person in the indoor and the indoor formaldehyde concentration is not lower than the second preset concentration, control the operating frequency of the compressor to be reduced, control the humidifier to stop operating, control the heat exchange fan to operate at an upper limit value of a rated power range of the heat exchange fan, and control the fresh air fan to operate at an upper limit value of a rated power range of the fresh air fan.

[0049] In some embodiments of the present application, further comprising:

[0050] a human sensor configured to detect whether there is a person in the indoor;

[0051] a controller configured to:

[0052] when the indoor heat exchanger works as a condenser and the human sensor detects that there is a person in the indoor, control the fresh air fan to operate at a first power lower than an upper limit value of a rated power range of the fresh air fan, control the indoor heat exchanger to work as an evaporator, and control the indoor heat exchanger to dehumidify, and when the indoor formaldehyde concentration is detected to be lower than the second preset concentration, control the compressor and the fresh air fan to stop operating.

[0053] In some embodiments of the present application, further comprising:

[0054] a human sensor configured to detect whether there is a person in the indoor;

[0055] a controller configured to:

[0056] when the indoor heat exchanger works as a condenser and the human sensor detects that there is no person in the indoor, control the fresh air fan to stop operating, control the indoor heat exchanger to work as an evaporator, and control the indoor heat exchanger to dehumidify, and when the indoor formaldehyde concentration is detected to be lower than the second preset concentration, control the compressor to stop operating.

[0057] This application also provides an air conditioner, which includes:

[0058] Air conditioner indoor unit, the air conditioner indoor unit includes:

[0059] The casing has a heat exchange air outlet;

[0060] The indoor heat exchanger is located inside the shell. The refrigerant flowing inside it 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 shell through the heat exchange outlet.

[0061] Indoor temperature sensor, used to detect indoor temperature;

[0062] Indoor humidity sensor, used to detect indoor humidity;

[0063] Formaldehyde concentration sensor, used to detect indoor formaldehyde concentration;

[0064] The controller is configured as follows:

[0065] When the indoor heat exchanger is working as a condenser, the indoor temperature sensor is controlled to detect the indoor temperature, and the indoor humidity sensor is controlled to detect the indoor humidity. When the indoor temperature is not lower than the first preset temperature and the indoor humidity is not lower than the first preset humidity, the formaldehyde concentration sensor is activated.

[0066] When the formaldehyde concentration sensor detects that the increase in indoor formaldehyde concentration within a preset time period is less than the first preset range, the current indoor formaldehyde concentration is defined as the first preset concentration, and the fresh air fan is controlled to operate at the upper limit of the rated power range of the fresh air fan.

[0067] When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is lower than the first preset concentration by a first decrease value, the fresh air fan is controlled to operate at a fourth power value lower than the upper limit of the rated power range of the fresh air fan.

[0068] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0069] Figure 1 This is a schematic diagram of the overall structure of an air conditioner according to one embodiment of this application;

[0070] Figure 2 This is a schematic diagram of the overall structure of a wall-mounted air conditioner indoor unit according to one embodiment of this application. Figure One ;

[0071] Figure 3 This is a schematic diagram of the overall structure of a wall-mounted air conditioner indoor unit according to one embodiment of this application. Figure Two;

[0072] Figure 4 is a working flow chart of the air conditioner indoor unit according to an embodiment of the present application;

[0073] Figure 5 is a working flow chart of the air conditioner indoor unit according to an embodiment of the present application when detecting that there is a person in the room;

[0074] Figure 6 is a working flow chart of the air conditioner indoor unit according to an embodiment of the present application when detecting that there is no person in the room;

[0075] Figure 7 is a working flow chart of the air conditioner indoor unit according to an embodiment of the present application when running in the heating mode Figure One ;

[0076] Figure 8 is a working flow chart of the air conditioner indoor unit according to an embodiment of the present application when running in the heating mode Figure Two ;

[0077] Figure 9 is a working flow chart of the air conditioner indoor unit according to an embodiment of the present application when running in the heating mode Figure Three ;

[0078] Figure 10 is a working flow chart of the air conditioner indoor unit according to an embodiment of the present application when running in the heating mode Figure Four ;

[0079] Figure 11 is a working flow chart of the air conditioner indoor unit according to an embodiment of the present application when running in the cooling mode Figure One ;

[0080] Figure 12 is a working flow chart of the air conditioner indoor unit according to an embodiment of the present application when running in the cooling mode Figure Two ;

[0081] Figure 13 is a working flow chart of the air conditioner indoor unit according to an embodiment of the present application when running in the cooling mode Figure Three ;

[0082] Figure 14 is a working flow chart of the air conditioner indoor unit according to an embodiment of the present application when running in the cooling mode Figure Four ;

[0083] Figure 15 is a working flow chart of the air conditioner indoor unit according to an embodiment of the present application when running in the cooling mode Figure Five ;

[0084] Figure 16 is a working process of the air conditioner indoor unit according to one of the embodiments of the present application when operating in a refrigeration mode Figure Six ;

[0085] Figure 17 is a working process of the air conditioner indoor unit according to one of the embodiments of the present application when operating in an aldehyde removal cycle Figure One ;

[0086] Figure 18 is a working process of the air conditioner indoor unit according to one of the embodiments of the present application when operating in an aldehyde removal cycle Figure Two ;

[0087] Figure 19 is a working process of the air conditioner indoor unit according to one of the embodiments of the present application when operating in an aldehyde removal cycle Figure Three ;

[0088] Figure 20 is a working process of the air conditioner indoor unit according to one of the embodiments of the present application when operating in an aldehyde removal cycle Figure Four ;

[0089] Figure 21 is a working process of the air conditioner indoor unit according to one of the embodiments of the present application when operating in an aldehyde removal cycle Figure Five .

[0090] In the above figures: the shell 100; the air conditioner outdoor unit 200. DETAILED DESCRIPTION

[0091] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0092] In the present application, unless specifically defined otherwise and limited in the specification, the terms "mount", "connected", "linking", "fixed", and the like are to be construed broadly and are not limited to a direct connection, but can be an indirect connection via an intermediate medium, or can be an integral part; can be a mechanical connection, or an electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0093] In the present application, unless specifically defined otherwise and limited in the specification, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0094] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0095] In the following, the present application will be specifically described by exemplary embodiments. However, it should be understood that the elements, structures and features in one embodiment can also be beneficially combined into other embodiments without further description.

[0096] In the present application, the air conditioner includes an air conditioner indoor unit and an air conditioner outdoor unit 200. When the air conditioner operates in a cooling mode, the air conditioner performs a cooling cycle of the air conditioner indoor unit by using a compressor, an outdoor heat exchanger, an expansion valve and an indoor heat exchanger.

[0097] The cooling cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been adjusted and heat exchanged, provides cold to the indoor space through the heat absorption process of the refrigerant, and achieves temperature adjustment of the indoor space.

[0098] The compressor compresses the low-temperature and low-pressure state refrigerant gas to discharge high-temperature and high-pressure state refrigerant gas, and the discharged refrigerant gas flows into the outdoor heat exchanger. The outdoor heat exchanger condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0099] The expansion valve expands the high-temperature and high-pressure state liquid phase refrigerant condensed in the outdoor heat exchanger into a low-pressure liquid phase refrigerant.

[0100] The indoor heat exchanger evaporates the refrigerant expanded in the expansion valve and returns the low-temperature and low-pressure state refrigerant gas to the compressor. The indoor heat exchanger can achieve a refrigeration effect by exchanging heat with indoor air using latent heat of evaporation of the refrigerant.

[0101] The air conditioning indoor unit can adjust the temperature of the indoor space throughout the refrigeration cycle.

[0102] When the air conditioner operates in a heating mode, the air conditioner performs a heating cycle of the air conditioning indoor unit through the compressor, the outdoor heat exchanger, the expansion valve, and the indoor heat exchanger.

[0103] The heating cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to air that has been adjusted and heat-exchanged, providing heat to the indoor space through the heat release process of the refrigerant, achieving temperature adjustment of the indoor space.

[0104] When the heating cycle is operated, the compressor compresses the low-temperature and low-pressure state refrigerant gas to discharge high-temperature and high-pressure state refrigerant gas, and the discharged refrigerant gas flows into the indoor heat exchanger. The indoor heat exchanger condenses the compressed refrigerant into a liquid phase, and the heat generated by condensation is heat-exchanged with indoor air flowing through the indoor heat exchanger, thereby increasing the indoor temperature.

[0105] The expansion valve expands the high-temperature and high-pressure state liquid phase refrigerant condensed in the outdoor heat exchanger into a low-pressure liquid phase refrigerant.

[0106] The outdoor heat exchanger evaporates the refrigerant expanded in the expansion valve and returns the low-temperature and low-pressure state refrigerant gas to the compressor. The outdoor heat exchanger can exchange heat with outdoor air using latent heat of evaporation of the refrigerant.

[0107] The air conditioning indoor unit can adjust the temperature of the indoor space throughout the heating cycle.

[0108] The air conditioning outdoor unit 200 includes at least a compressor and an outdoor heat exchanger, the air conditioning indoor unit includes at least an indoor heat exchanger, and the expansion valve can be provided in the air conditioning indoor unit or the air conditioning outdoor unit 200.

[0109] The indoor heat exchanger and the outdoor heat exchanger are used as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner indoor unit is used as a heater in a heating mode, and when the indoor heat exchanger is used as an indoor heat exchanger, the air conditioner indoor unit is used as a cooler in a cooling mode.

[0110] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0111] As shown in the accompanying Figures 1 to 17 embodiment of the air conditioner of the present application.

[0112] The air conditioner includes an air conditioner indoor unit and an air conditioner outdoor unit 200, the air conditioner outdoor unit 200 including a compressor and an outdoor heat exchanger, and the air conditioner indoor unit including an indoor heat exchanger, and an expansion valve can be provided in the air conditioner indoor unit or the air conditioner outdoor unit 200.

[0113] The air conditioner of the present application includes an indoor heat exchanger, an outdoor heat exchanger, a compressor, an expansion valve, and a refrigerant flow circuit, and the indoor heat exchanger 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 and the outdoor heat exchanger, and can expand the liquid refrigerant that has undergone a condensation process into low-pressure liquid refrigerant.

[0114] The compressor includes a suction port and a discharge port, and the refrigerant that has undergone an evaporation process enters the compressor from the suction port, and the compressor compresses the gaseous refrigerant into a high-temperature and high-pressure state and discharges it from the discharge port.

[0115] The indoor heat exchanger and the outdoor heat exchanger are connected through a four-way valve and the compressor in the refrigerant circuit, respectively, 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 suction port of the compressor is fixedly connected to the first valve port, and the discharge port of the compressor is fixedly connected to the third valve port.

[0116] In the refrigerant circuit, the refrigerant can sequentially circulate through the compressor, the indoor heat exchanger, the expansion valve, and the outdoor heat exchanger.

[0117] When the air conditioner is in a 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 a 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.

[0118] In some embodiments, the air conditioner indoor unit includes a housing 100, an indoor heat exchanger, a humidifier, a heat exchange fan, a fresh air module, an indoor temperature sensor, an indoor humidity sensor, a formaldehyde concentration sensor, and a human sensor.

[0119] The housing 100 forms the overall appearance of the air conditioner indoor unit, and the indoor heat exchanger, the heat exchange fan, and the fresh air fan are arranged inside the housing 100.

[0120] The shell 100 is provided with an indoor air inlet, an outdoor air inlet, a heat exchange air outlet and a fresh air outlet.

[0121] The indoor heat exchanger is arranged inside the shell 100, and heat exchange between the refrigerant flowing inside the indoor heat exchanger and the indoor air forms a heating cycle or a refrigeration cycle, and the indoor air flows to the outside of the shell 100 through the heat exchange air outlet after flowing through the indoor heat exchanger.

[0122] The heat exchange fan can be a cross-flow fan, when the heat exchange fan is started, the indoor air is introduced into the shell 100 by the driving of the heat exchange fan, and the heat exchange fan is used to provide power for the indoor air to flow from the indoor air inlet to the heat exchange air outlet through the inside of the shell 100. The heat exchange fan includes a heat exchange fan and a heat exchange driving motor, and the heat exchange driving motor drives the heat exchange fan to rotate.

[0123] The indoor air enters the shell 100 through the indoor air inlet, exchanges heat with the heat exchanger, and then flows out from the heat exchange air outlet on the shell 100 to the indoor space, realizing the supply of indoor air.

[0124] The humidifier is arranged in the shell 100, and the humidifier is used to generate steam, which can flow to the outside of the shell 100 through the heat exchange air outlet under the driving of the heat exchange fan.

[0125] The fresh air module is arranged in the space in the shell 100 of the air conditioner indoor unit, and the fresh air module includes a fresh air fan shell, the fresh air fan shell is provided with a fresh air inlet and a fresh air outlet, the fresh air inlet is correspondingly and communicatively arranged with the outdoor air inlet on the shell 100, and a fresh air cavity is formed in the fresh air module and communicates the fresh air inlet and the fresh air outlet. The fresh air inlet can be arranged at the top, front side, rear side, left side or right side of the fresh air fan shell, and correspondingly, the outdoor air inlet can be arranged at the top, front side, rear side, left side or right side of the shell 100.

[0126] The fresh air outlet can be arranged around the air conditioner air outlet of the shell 100, so that when the fresh air flows out from the fresh air outlet, it mixes with the air conditioner air flowing out from the heat exchange air outlet, so as to reduce the great influence of the fresh air on the temperature and humidity of the indoor environment, and improve the comfort of the user when using the fresh air module. It can be arranged that the fresh air outlet can also be arranged at the top, front side, rear side, left side or right side of the shell 100.

[0127] The fresh air module includes a fresh air fan arranged in the fresh air cavity, and the fresh air fan can be a centrifugal fan, when the fresh air fan is started, the outdoor air is introduced into the indoor through the fresh air module, and the fresh air fan is used to provide power for the fresh air to flow from the fresh air inlet to the fresh air outlet. The fresh air fan includes a fan and a driving motor, and the driving motor drives the fan to rotate.

[0128] The fresh air module further comprises a fresh air pipe communicating with the indoor and outdoor, and the fresh air pipe corresponds to the air pipe installation hole provided on the wall.

[0129] In some embodiments, the fresh air pipe is provided in the air pipe installation hole provided on the wall, one end of the fresh air pipe is directed to the indoor and connected with the fresh air inlet of the fresh air module, the other end of the fresh air pipe is directed to the outdoor and provided with an air inlet, and the fresh air pipe is communicated with the outdoor through the air inlet. Under the action of the fresh air fan, the outdoor fresh air enters the fresh air module from the outdoor along the fresh air pipe and is blown to the indoor from the fresh air outlet, so as to realize the introduction of the outdoor fresh air to the indoor.

[0130] The indoor temperature sensor is arranged at the indoor air inlet, and the indoor temperature sensor is used for detecting the indoor temperature. The indoor humidity sensor is arranged at the indoor air inlet, and the indoor humidity sensor is used for detecting the indoor humidity.

[0131] It can be provided that the indoor temperature sensor and the indoor humidity sensor can adopt an integrated temperature and humidity sensor. The indoor temperature and the indoor humidity are detected by the temperature and humidity sensor.

[0132] The formaldehyde concentration sensor is arranged at the heat exchange outlet, and the formaldehyde concentration sensor is used for detecting the indoor formaldehyde concentration.

[0133] The human sensor is arranged on the shell 100 and is used for detecting whether there is a person in the indoor. The human sensor can adopt an infrared human sensor to detect whether there is a person in the indoor.

[0134] The indoor heat exchanger further comprises an inner air guide plate and an outer air guide plate. The inner air guide plate is arranged at the heat exchange outlet and located on the inner side of the shell 100. The outer air guide plate is arranged at the heat exchange outlet of the air conditioner indoor unit, and the heat exchange outlet is communicated with the indoor air inlet. Under the drive of the heat exchange fan, the indoor air enters the shell 100 from the indoor air inlet, flows through the indoor heat exchanger, and is discharged to the indoor space through the heat exchange outlet.

[0135] When the air conditioner indoor unit is a cabinet type air conditioner indoor unit, the inner air guide plate can swing up and down to swing the indoor air up and down. The outer air guide plate can rotate left and right to swing the indoor air.

[0136] When the air conditioner indoor unit is a hanging type air conditioner indoor unit, the inner air guide plate can swing left and right to swing the indoor air left and right. The outer air guide plate can rotate up and down to swing the indoor air.

[0137] Referring to Figures 4-16 In some embodiments, when the controller receives a command to start the de-aldehyde mode, the human sensor is started to detect whether there is a person in the indoor.

[0138] When the human sensing sensor detects that there is a person in the room, if the indoor heat exchanger of the air conditioner indoor unit is in a working state at this time, the controller controls the working state of the indoor heat exchanger and the humidifier to remain unchanged. At this time, the control command of the formaldehyde removal program to the temperature and humidity of the air conditioner is inhibited, and the controller runs with the highest priority of the temperature and humidity set by the user.

[0139] After the controller receives the command to start the formaldehyde removal mode, it still runs with the highest priority of the temperature and humidity set by the user, thereby avoiding the influence of the change in the regulation of the indoor temperature and humidity when the dehumidification program is running on the user.

[0140] When the controller receives the command to start the formaldehyde removal mode, if the inner air deflector and the outer air deflector are in a non-windless state at this time, the movement state of the inner air deflector and the outer air deflector is controlled to remain unchanged, so that the resistance of the indoor air flowing out of the heat exchange air outlet is small, and the indoor air can be quickly circulated.

[0141] If the inner air deflector and the outer air deflector are in a windless state at this time, the controller controls the inner air deflector and the outer air deflector to be in a state of preventing direct blowing, and controls the rotation speed of the heat exchange fan to remain unchanged at the rotation speed set by the user at this time, thereby avoiding the influence of the large rotation speed of the heat exchange fan on the user.

[0142] When the compressor stops running, the user starts the formaldehyde removal mode, at this time the controller receives the command to start the formaldehyde removal mode, and the controller controls the air conditioner indoor unit to issue a prompt, thereby reminding the user to start the air conditioner first, and then start the formaldehyde removal mode, so that the formaldehyde removal mode cannot be started alone, in order to facilitate the normal operation of the formaldehyde removal mode.

[0143] It can be set that in some embodiments, a prompt sticker can be set on the control panel of the shell 100, or when the user starts the formaldehyde removal function alone on the control software corresponding to the air conditioner indoor unit, the control software will pop up corresponding prompt information. The prompt information can be set as "please start the air conditioner first", thereby reminding the user to start the air conditioner first when correctly operating the formaldehyde removal mode.

[0144] In some embodiments, when the human sensing sensor detects that there is a person in the room, the air conditioner indoor unit issues a prompt to remind the user to leave the room within a preset time. After the preset time of the prompt, the human sensing sensor detects whether there is a person in the room again.

[0145] The way in which the air conditioner indoor unit issues a prompt includes that the air conditioner indoor unit issues a voice prompt or the air conditioner indoor unit issues a prompt through its control software. The preset time can be set to five minutes.

[0146] When it is detected that there is no one in the room, the controller controls to start executing the formaldehyde removal cycle.

[0147] In some embodiments, when the user starts the formaldehyde removal mode, the controller controls the air conditioner to issue a prompt to the user to remind the user not to return to the indoor during the formaldehyde removal time, and to return after the formaldehyde removal time. The formaldehyde removal time can be set to two hours. This is beneficial to avoid the user returning to the indoor during the formaldehyde removal cycle, at which time the indoor formaldehyde concentration is high, the indoor temperature and the indoor humidity are high, which is easy to cause discomfort to the user, and is not conducive to the formaldehyde removal cycle.

[0148] When the human sensing sensor detects that there is a person in the indoor, the controller is configured to control the fresh air fan to operate at an upper limit value of the rated power of the fresh air fan. The fresh air fan speed is adjusted to the highest speed, so as to achieve the maximum fresh air volume, rapidly ventilate the indoor air, and reduce the indoor formaldehyde concentration.

[0149] In some embodiments, the air conditioner indoor unit is further provided with a formaldehyde removal module, which is used to remove formaldehyde in the indoor air. The formaldehyde removal module removes formaldehyde in the indoor air in a manner including but not limited to physical adsorption (for example: activated carbon and other adsorption materials), chemical bonding (for example: potassium permanganate chemical reaction and the like), catalytic oxidation (for example: photocatalyst catalysis, normal temperature catalyst catalysis, high temperature catalyst catalysis) and other technical means.

[0150] When the air conditioner indoor unit is provided with a formaldehyde removal module, after the controller receives a command to start the formaldehyde removal mode, the human sensing sensor is started to detect whether there is a person in the indoor.

[0151] When the human sensing sensor detects that there is a person in the indoor, if the indoor heat exchanger of the air conditioner indoor unit is in a working state at this time, the controller controls the working states of the indoor heat exchanger and the humidifier to remain unchanged. The controller controls the formaldehyde removal module to be started to purify formaldehyde in the indoor air.

[0152] When there is a person in the indoor, the formaldehyde removal module is started to purify the indoor formaldehyde, which can avoid causing changes in the indoor temperature and humidity, avoid discomfort of the indoor user, and improve the use experience of the indoor user.

[0153] When the human sensing sensor detects that there is no person in the indoor, the controller controls the fresh air fan to be started to operate, and the fresh air fan operates at an upper limit value of the rated power of the fresh air fan, so as to achieve the maximum fresh air volume and rapidly ventilate the indoor air.

[0154] In some embodiments, when the controller obtains that the current date is a preset date, the controller controls the air conditioner to switch to the formaldehyde removal mode. In the formaldehyde removal mode, the air conditioner operates a heating cycle, and controls the indoor heat exchanger to work as a condenser. The preset date can be set to a working day, which refers to the user working time from Monday to Friday.

[0155] When the controller obtains that the current date is not the preset date, it means that this time is a rest day, which refers to Saturday and Sunday.

[0156] The air conditioner can be linked with a smart device in the room to obtain whether the current time is a preset time. The smart device can be a mobile phone, a computer or a smart voice assistant. The linkage mode can be Bluetooth or cloud transmission.

[0157] When the aldehyde removal mode is started, the controller controls the air conditioner to run multiple aldehyde removal cycles. The number of aldehyde removal cycles can be set to four. Because one aldehyde removal cycle generally takes about two hours, and the default working time of a user in a day is eight hours, four aldehyde removal cycles are started when there is no one in the room, so that multiple aldehyde removal cycles can be performed before the user returns to the room, thereby improving the aldehyde removal efficiency.

[0158] One aldehyde removal cycle includes: determining whether the indoor heat exchanger works as a condenser, when the indoor heat exchanger works as a condenser, the controller controls the indoor temperature sensor to detect the indoor temperature, and the controller controls the indoor humidity sensor to detect the indoor humidity.

[0159] When the indoor temperature sensor detects that the indoor temperature is lower than the first preset temperature, and the indoor humidity sensor detects that the indoor humidity is not lower than the first preset humidity, the controller controls to increase the operating frequency of the compressor, and the controller controls to start the humidifier.

[0160] The controller increases the heat exchange amount of the indoor heat exchanger by controlling to increase the frequency of the compressor, so that when the indoor air flows through the indoor heat exchanger, the indoor air is heated by the indoor heat exchanger, and the heated indoor air flows to the room through the heat exchange air outlet, thereby increasing the indoor temperature.

[0161] With the increase of the indoor temperature, the indoor humidity will decrease, and the indoor humidity may be lower than the first preset humidity. When the indoor temperature is lower than the first preset temperature, and the indoor humidity is not lower than the first preset humidity, the humidifier is started to make the indoor humidity not lower than the first preset humidity, thereby increasing the release of formaldehyde in the indoor furniture into the air. In combination with increasing the frequency of the compressor to increase the temperature, the release of formaldehyde in the indoor furniture can be further promoted.

[0162] When the indoor temperature sensor detects that the indoor temperature is lower than the first preset temperature, and the indoor humidity sensor detects that the indoor humidity is lower than the first preset humidity, the controller controls to increase the operating frequency of the compressor, and the controller controls to start the humidifier.

[0163] The controller increases the heat exchange amount of the indoor heat exchanger by controlling to increase the frequency of the compressor, so that when the indoor air flows through the indoor heat exchanger, the indoor air is heated by the indoor heat exchanger, and the heated indoor air flows to the room through the heat exchange air outlet, thereby increasing the indoor temperature.

[0164] When the indoor temperature sensor detects that the indoor temperature is not lower than the first preset temperature, and the indoor humidity sensor detects that the indoor humidity is lower than the first preset humidity, the controller controls the compressor to keep the current operating frequency, and the indoor heat exchanger keeps the current heating state to satisfy that the indoor temperature is not lower than the first preset temperature, and avoids that the change of the operating frequency of the compressor leads to high energy consumption. The controller controls the humidifier to keep the current operating state, controls the heat exchange fan to operate at the upper limit value of the rated power range of the heat exchange fan, and controls the fresh air fan to operate at the upper limit value of the rated power range of the fresh air fan.

[0165] When the indoor temperature sensor detects that the indoor temperature is not lower than the first preset temperature, and the indoor humidity sensor detects that the indoor humidity is lower than the first preset humidity, the controller controls the compressor to keep the current operating frequency, and the indoor heat exchanger keeps the current heating state to satisfy that the indoor temperature is not lower than the first preset temperature, and avoids that the change of the operating frequency of the compressor leads to high energy consumption. The controller controls the humidifier to keep the current operating state, controls the heat exchange fan to operate at the upper limit value of the rated power range of the heat exchange fan, and controls the fresh air fan to operate at the upper limit value of the rated power range of the fresh air fan.

[0166] The controller controls the humidifier to be turned on, so that the indoor humidity is increased, and the high-humidity indoor environment can increase the release of formaldehyde in furniture in the room into the air. In combination with the heating of the indoor heat exchanger, the indoor temperature is increased, and the high-temperature and high-humidity indoor environment can further promote the release of formaldehyde in furniture in the room.

[0167] When the indoor temperature sensor detects that the indoor temperature is not lower than the first preset temperature, and the indoor humidity sensor detects that the indoor humidity is not lower than the first preset humidity, the controller controls the compressor to keep the current operating frequency, and the indoor heat exchanger keeps the current heating state to satisfy that the indoor temperature is not lower than the first preset temperature, and avoids that the change of the operating frequency of the compressor leads to high energy consumption. The controller controls the humidifier to keep the current operating state, controls the heat exchange fan to operate at the upper limit value of the rated power range of the heat exchange fan, and controls the fresh air fan to operate at the upper limit value of the rated power range of the fresh air fan.

[0168] The controller controls the humidifier to be turned on, so that the indoor humidity is increased, and the high-humidity indoor environment can increase the release of formaldehyde in furniture in the room into the air. In combination with the heating of the indoor heat exchanger, the indoor temperature is increased, and the high-temperature and high-humidity indoor environment can further promote the release of formaldehyde in furniture in the room.

[0169] The heat exchange fan is controlled to operate at the upper limit value of the rated power range of the heat exchange fan, so that the indoor air flow is promoted, the heat exchange between the indoor air and the indoor heat exchanger is improved, and the indoor temperature is promoted, so that the indoor air is continuously heated.

[0170] The fresh air fan is controlled to operate at the upper limit value of the rated power range of the fresh air fan, and the indoor temperature is continuously heated under the action of the indoor heat exchanger, so that the indoor temperature is conducive to the release of formaldehyde in furniture in the room. When the indoor temperature sensor detects that the indoor temperature is not lower than the first preset temperature, and the indoor humidity sensor detects that the indoor humidity is not lower than the first preset humidity, the fresh air fan drives outdoor fresh air into the room, so as to dilute the indoor formaldehyde concentration and extrude formaldehyde out of the room.

[0171] It can be provided that the new air fan can deliver new air to the indoor in the following ways: directly introducing outdoor new air into the indoor through a new air pipe, or delivering indoor air to the outdoor by the new air fan to form a negative pressure in the indoor, and then introducing outdoor new air into the indoor through a door gap or a window gap.

[0172] It can be provided that when the indoor temperature sensor detects that the indoor temperature is not lower than the first preset temperature, and the indoor humidity sensor detects that the indoor humidity is not lower than the first preset humidity, the controller controls the inner and outer air deflectors to rotate to the minimum air blocking position to reduce the resistance of the indoor air flowing out of the heat exchange air outlet and improve the disturbance effect of the air conditioner on the indoor air.

[0173] In the step of executing the formaldehyde removal cycle and judging whether the indoor heat exchanger works as a condenser, when the indoor heat exchanger works as an evaporator, the controller controls the indoor heat exchanger to switch to work as a condenser, and controls the inner and outer air deflectors to rotate to the minimum air blocking position to reduce the resistance of the indoor air flowing out of the heat exchange air outlet and improve the disturbance effect of the air conditioner on the indoor air, and at the same time, the air conditioner heats the indoor air flowing through the indoor heat exchanger to raise the indoor temperature to facilitate the release of formaldehyde in the indoor furniture into the air.

[0174] In the step of executing the formaldehyde removal cycle and judging whether the indoor heat exchanger works as a condenser, when the indoor heat exchanger does not work as a condenser, the controller controls the indoor heat exchanger to switch to work as a condenser, the controller controls the indoor temperature sensor to detect the indoor temperature, and the controller controls the indoor humidity sensor to detect the indoor humidity.

[0175] When the indoor temperature sensor detects that the indoor temperature is lower than the first preset temperature, and the indoor humidity sensor detects that the indoor humidity is not lower than the first preset humidity, the controller controls to increase the operating frequency of the compressor, and the controller controls to turn on the humidifier.

[0176] The controller increases the heat exchange capacity of the indoor heat exchanger by controlling to increase the frequency of the compressor, so that the indoor air is heated by the indoor heat exchanger when the indoor air flows through the indoor heat exchanger, and the heated indoor air flows to the indoor through the heat exchange air outlet, thereby increasing the indoor temperature.

[0177] With the increase of the indoor temperature, the indoor humidity will decrease, and there may be a case that the indoor humidity is lower than the first preset humidity. When the indoor temperature is lower than the first preset temperature and the indoor humidity is not lower than the first preset humidity, the humidifier is turned on to make the indoor humidity not lower than the first preset humidity, thereby improving the release of formaldehyde in the indoor furniture into the air. In combination with increasing the frequency of the compressor to increase the temperature, the release of formaldehyde in the indoor furniture can be further promoted.

[0178] When the indoor temperature sensor detects that the indoor temperature is lower than the first preset temperature, and the indoor humidity sensor detects that the indoor humidity is lower than the first preset humidity, the controller controls to increase the operating frequency of the compressor, and the controller controls to start the humidifier.

[0179] The controller increases the heat exchange amount of the indoor heat exchanger by controlling to increase the frequency of the compressor, so that when the indoor air flows through the indoor heat exchanger, the indoor air is heated by the indoor heat exchanger, and the heated indoor air flows to the indoor environment through the heat exchange air outlet, thereby increasing the indoor temperature.

[0180] When the indoor humidity is lower than the first preset humidity, the humidifier is started to increase the indoor humidity, so that the indoor humidity is increased to be not lower than the first preset humidity, and the high-humidity indoor environment can increase the release of formaldehyde in the indoor furniture into the air. In combination with increasing the indoor temperature by increasing the frequency of the compressor, the high-temperature and high-humidity indoor environment can further promote the release of formaldehyde in the indoor furniture.

[0181] When the indoor temperature sensor detects that the indoor temperature is not lower than the first preset temperature, and the indoor humidity sensor detects that the indoor humidity is lower than the first preset humidity, the controller controls to stop the operation of the compressor and the indoor heat exchanger, and controls to start the humidifier.

[0182] The controller controls to start the humidifier to increase the indoor humidity, and the high-humidity indoor environment can increase the release of formaldehyde in the indoor furniture into the air. At this time, the indoor temperature is higher than the first preset temperature, and the high-temperature and high-humidity indoor environment can further promote the release of formaldehyde in the indoor furniture.

[0183] When the indoor temperature sensor detects that the indoor temperature is not lower than the first preset temperature, and the indoor humidity sensor detects that the indoor humidity is not lower than the first preset humidity, the controller controls the operating frequency of the compressor to be unchanged, and the indoor heat exchanger maintains the current heating state to satisfy that the indoor temperature is not lower than the first preset temperature, so as to avoid that the change of the operating frequency of the compressor leads to high energy consumption. The controller controls the operating state of the humidifier to be unchanged, controls the heat exchange fan to operate at the upper limit value of the rated power range of the heat exchange fan, and controls the fresh air fan to operate at the upper limit value of the rated power range of the fresh air fan.

[0184] The controller controls to start the humidifier to increase the indoor humidity, and the high-humidity indoor environment can increase the release of formaldehyde in the indoor furniture into the air. In combination with the heating of the indoor heat exchanger to increase the indoor temperature, the high-temperature and high-humidity indoor environment can further promote the release of formaldehyde in the indoor furniture.

[0185] Controlling the heat exchange fan to operate at the upper limit value of the rated power range of the heat exchange fan can promote the flow of indoor air, increase the heat exchange between the indoor air and the indoor heat exchanger, and further promote the increase of the indoor temperature, so that the indoor air is continuously heated, under the condition that the operating frequency of the compressor is unchanged.

[0186] The fresh air fan is controlled to operate at an upper limit value of a rated power range of the fresh air fan, and the indoor temperature is continuously heated under the action of the indoor heat exchanger, so that the indoor temperature is conducive to the release of formaldehyde in the indoor furniture. When the indoor temperature sensor detects that the indoor temperature is not lower than the first preset temperature and the indoor humidity sensor detects that the indoor humidity is not lower than the first preset humidity, the fresh air fan drives outdoor fresh air into the indoor, thereby diluting the indoor formaldehyde concentration and simultaneously extruding the formaldehyde out of the indoor.

[0187] When the indoor temperature sensor detects that the indoor temperature is not lower than the first preset temperature and the indoor humidity sensor detects that the indoor humidity is not lower than the first preset humidity, after a preset first time, the controller controls the formaldehyde concentration sensor to be turned on to detect the indoor formaldehyde concentration. The preset first time can be set to two hours.

[0188] When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is lower than the second preset concentration, the fresh air fan is controlled to stop operating, and the indoor heat exchanger and the humidifier are controlled to maintain the working state, at this time, one formaldehyde removal cycle ends.

[0189] When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is lower than the second preset concentration, at this time, the indoor formaldehyde concentration has dropped to a safe value with a lower concentration and does not cause harm to the human body. Stopping the fresh air fan from operating can save energy consumption. Controlling the indoor heat exchanger and the humidifier to maintain the working state can avoid the introduction of fresh air to cause a large decrease in the indoor temperature and the indoor humidity, and maintain the indoor state as high temperature and high humidity, so that after the formaldehyde drops below the second preset concentration, the indoor environment with high temperature and high humidity can still continuously release the formaldehyde in the primary indoor furniture into the air.

[0190] It can be set that when the indoor temperature sensor detects that the indoor temperature is not lower than the first preset temperature and the indoor humidity sensor detects that the indoor humidity is not lower than the first preset humidity, after a preset first time, the controller controls the formaldehyde concentration sensor to be turned on to detect the indoor formaldehyde concentration. When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is lower than the second preset concentration, the fresh air fan is controlled to stop operating, and the indoor heat exchanger and the humidifier are controlled to maintain the working state, at this time, one formaldehyde removal cycle ends. The preset first time can be set to two hours.

[0191] When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is not lower than a preset amplitude of the second preset concentration, the fresh air fan is controlled to be turned on, at this time, the next formaldehyde removal cycle is started.

[0192] At this time, when the indoor formaldehyde concentration rises to not lower than a preset amplitude of the second preset concentration, the fresh air fan is controlled to be turned on to reduce the indoor formaldehyde concentration, and the fresh air fan drives outdoor fresh air into the indoor, thereby diluting the indoor formaldehyde concentration and simultaneously extruding the formaldehyde out of the indoor.

[0193] The preset amplitude of the second preset concentration can be set as a multiple of the second preset concentration. It can be set that the preset amplitude of the second preset concentration is set as twice the second preset concentration. That is, when it is detected that the indoor formaldehyde concentration is higher than twice the second preset concentration, it indicates that a large amount of formaldehyde is released into the indoor air by the furniture and home decoration at this time. At this time, the fresh air fan is started to drive outdoor fresh air into the room, thereby diluting the indoor formaldehyde concentration.

[0194] When the formaldehyde removal mode is running, the human sensor detects that the user returns home again, and the user adjusts the air conditioner to other running modes. That is, when the formaldehyde removal mode is running, the controller receives an instruction to run other modes, and the controller controls the formaldehyde concentration sensor to detect the indoor formaldehyde concentration.

[0195] When the indoor formaldehyde concentration is not lower than the second preset concentration, the operation frequency of the compressor is controlled to be reduced, the humidifier is controlled to stop running, the heat exchanger fan is controlled to run at an upper limit value of the rated power range of the heat exchanger fan, and the fresh air fan is controlled to run at an upper limit value of the rated power range of the fresh air fan.

[0196] Since the formaldehyde removal mode is running, the indoor environment is high temperature and high humidity to promote the release of formaldehyde. The high temperature and high humidity environment is not the best temperature and humidity state for human comfort, and it is necessary to control the heat exchange amount of the indoor heat exchanger to reduce the indoor temperature. The humidifier is turned off to quickly reduce the indoor humidity to prevent the high temperature and high humidity environment from causing discomfort to the human body.

[0197] The heat exchanger fan runs at an upper limit value of the rated power range of the heat exchanger fan to promote the disturbance effect of the indoor air. The fresh air fan runs at an upper limit value of the rated power range of the fresh air fan to introduce a large amount of fresh air into the room to promote the indoor formaldehyde concentration to decrease to below the second preset concentration as soon as possible.

[0198] It can be set that at this time, the controller obtains the position of the indoor user through the human sensor, and the inner and outer guide vanes are turned to the position switched to the air outlet to avoid the user. Since the indoor temperature and humidity at this time are not suitable for the user, the indoor air or outdoor suction air is avoided from blowing to the user to avoid discomfort to the user.

[0199] It can be set that when the formaldehyde removal mode is running, the human sensor detects that the user returns home again, and the user adjusts the air conditioner to other running modes. That is, when the formaldehyde removal mode is running, the controller receives an instruction to run other modes, and the controller controls the formaldehyde concentration sensor to detect the indoor formaldehyde concentration. When the indoor formaldehyde concentration is not lower than the second preset concentration, the formaldehyde removal module is controlled to be started, and the indoor air flows through the formaldehyde removal module to purify the formaldehyde in the indoor air and reduce the indoor formaldehyde concentration.

[0200] When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration drops below the second preset concentration, the controller controls the heat exchange fan to operate at a second power lower than the upper limit of the rated power range of the heat exchange fan, and controls the fresh air fan to operate at a third power lower than the upper limit of the rated power range of the fresh air fan. At this time, the indoor formaldehyde concentration is low and will not harm the human body, and reducing the power of the heat exchange fan and the fresh air fan can achieve the effect of saving the energy consumption of the air conditioner.

[0201] When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration drops below the second preset concentration, the adjustment of each component of the air conditioner follows the instruction sent by the user, that is, the air conditioner can operate the corresponding mode according to the instruction issued by the user.

[0202] It can be provided that when the indoor formaldehyde concentration is not lower than the second preset concentration, the instruction from the user will be shielded and will not have any effect until the indoor formaldehyde concentration is lower than the second preset concentration, and the controller will respond to the user instruction. It should be noted that when the indoor formaldehyde concentration is not lower than the second preset concentration, if the user performs an interference operation, there will be a corresponding reminder, including a voice reminder or a software prompt of intelligent interconnection, and the user can perform the operation only when the indoor formaldehyde concentration is lower than the second preset concentration.

[0203] When a certain formaldehyde removal cycle ends and the next cycle is not started, that is, when the indoor formaldehyde concentration is not lower than the second preset concentration and is lower than the preset amplitude of the second preset concentration, the indoor heat exchanger works as a condenser at this time. When the controller receives a command to close the formaldehyde removal mode, the controller controls the human sensing sensor to detect whether there is a person in the room.

[0204] When the human sensing sensor detects that there is no one in the room, the fresh air fan is controlled to stop operating, the air conditioner operates a dehumidification mode, and the indoor heat exchanger is controlled to work as an evaporator, so that the indoor heat exchanger dehumidifies. In order to prevent the indoor formaldehyde concentration from being high at this time, by operating the dehumidification mode, the formaldehyde in the indoor air condenses in the condensed water along with the water in the air when the indoor air flows through the indoor evaporator, and the formaldehyde is discharged to the outdoor along with the condensed water, thereby reducing the indoor formaldehyde concentration and the indoor humidity.

[0205] When it is detected that the indoor formaldehyde concentration is lower than the second preset concentration, the indoor formaldehyde concentration is low at this time, and the formaldehyde removal cycle does not need to be performed, and the compressor is controlled to stop operating.

[0206] When the air conditioner operates the dehumidification mode, the air conditioner performs a dehumidification cycle of the air conditioner indoor unit by using the compressor, the outdoor heat exchanger, the expansion valve and the indoor heat exchanger.

[0207] The dehumidification cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been adjusted and heat exchanged to provide cold to the indoor space through the heat absorption process of the refrigerant to achieve temperature regulation of the indoor space.

[0208] The compressor compresses the refrigerant gas in a low-temperature and low-pressure state to discharge refrigerant gas in a high-temperature and high-pressure state, and the discharged refrigerant gas flows into the outdoor heat exchanger. The outdoor heat exchanger condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0209] The expansion valve expands the high-temperature and high-pressure state liquid phase refrigerant condensed in the outdoor heat exchanger into a low-pressure liquid phase refrigerant.

[0210] The indoor 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 indoor heat exchanger can achieve a refrigeration effect by heat exchanging with indoor air using the latent heat of evaporation of the refrigerant.

[0211] During the entire dehumidification cycle, the air conditioner indoor unit can condense the moisture in the indoor air into condensed water, thereby reducing the indoor humidity.

[0212] When a certain de-aldehyde cycle ends and the next cycle is not started, the indoor heat exchanger works as a condenser at this time. When the controller receives a command to turn off the de-aldehyde mode, the controller controls the human sensor to detect whether there is a person in the room.

[0213] When the human sensor detects that there is a person in the room, the fresh air fan is controlled to operate at a first power lower than the upper limit of the rated power range of the fresh air fan, the air conditioner operates in a dehumidification mode, the indoor heat exchanger is controlled to work as an evaporator, and the indoor heat exchanger is dehumidified. When it is detected that the indoor formaldehyde concentration is lower than a second preset concentration, the compressor and the fresh air fan are stopped.

[0214] When the indoor formaldehyde concentration is not lower than the second preset concentration but lower than a preset amplitude of the second preset concentration, the high concentration of formaldehyde can cause harm to the human body. Switching the fresh air fan to operate at the first power can prevent the rapid introduction of a large amount of outdoor air from causing a large impact on the thermal load of the indoor space and causing discomfort to the human body.

[0215] At this time, the indoor heat exchanger is controlled to work as an evaporator, and the indoor heat exchanger is dehumidified. To prevent the indoor formaldehyde concentration from being high at this time, by operating the dehumidification mode, when the indoor air flows through the indoor evaporator, the formaldehyde in the indoor air condenses in the condensed water along with the moisture in the air, and the formaldehyde is discharged to the outdoor along with the condensed water, thereby reducing the indoor formaldehyde concentration and the indoor humidity, so that the indoor humidity is lower than the second preset humidity to avoid discomfort to the user. The value of the second preset humidity can be set to 50%.

[0216] When the indoor formaldehyde concentration is detected to be lower than the second preset concentration, the indoor formaldehyde concentration is low and does not cause harm to the human body, the controller controls the compressor and the fresh air fan to stop running, which can save the energy consumption of the air conditioner.

[0217] It can be provided that when a certain aldehyde removal cycle ends and the next cycle is not started, the indoor heat exchanger works as a condenser. When the controller receives a command to close the aldehyde removal mode, the controller controls the human sensing sensor to detect whether there is a person in the room.

[0218] When the aldehyde removal module is arranged in the indoor unit of the air conditioner and the human sensing sensor detects that there is a person in the room, the controller controls the aldehyde removal module to start running for a second preset time, which can be set to thirty minutes. Thus, when the indoor air flows through the aldehyde removal module, the aldehyde removal module purifies the formaldehyde in the air, thereby rapidly reducing the indoor formaldehyde concentration and avoiding harm to the human body.

[0219] At the same time, the fresh air fan is controlled to run at a first power that is lower than the upper limit of the rated power range of the fresh air fan, and the indoor heat exchanger is controlled to work as an evaporator, so that the indoor heat exchanger dehumidifies. When the indoor formaldehyde concentration is detected to be lower than the second preset concentration, the compressor and the fresh air fan are controlled to stop running.

[0220] When the indoor formaldehyde concentration is detected to be lower than the second preset concentration, the indoor formaldehyde concentration is low and does not cause harm to the human body, the controller controls the compressor and the fresh air fan to stop running, which can save the energy consumption of the air conditioner.

[0221] When the aldehyde removal mode is closed, the controller controls the air conditioner to issue a voice reminder, or issues a prompt through the software of intelligent interconnection, or controls the aldehyde removal indicator light on the display panel to be turned off, so as to remind the user that the aldehyde removal mode has been closed. When the aldehyde removal mode is started, the aldehyde removal indicator light on the display panel is turned on.

[0222] Referring to Figures 17-21 In some embodiments, one aldehyde removal cycle can be provided to include: controlling the indoor heat exchanger to work as a condenser, the controller controls the indoor temperature sensor to detect the indoor temperature, and the controller controls the indoor humidity sensor to detect the indoor humidity.

[0223] When the indoor temperature sensor detects that the indoor temperature is lower than the first preset temperature and the indoor humidity sensor detects that the indoor humidity is not lower than the first preset humidity, the controller controls to increase the running frequency of the compressor, so that the compressor runs at the upper limit of the rated power range of the compressor, so that the indoor heat exchanger runs at the maximum heating power. The controller controls to start the humidifier.

[0224] The controller controls the compressor to increase the heat exchange amount of the indoor heat exchanger by increasing the frequency of the compressor, so that the indoor air is heated by the indoor heat exchanger when the indoor air flows through the indoor heat exchanger, and the heated indoor air flows to the indoor environment through the heat exchange air outlet, thereby increasing the indoor temperature.

[0225] As the indoor temperature increases, the indoor humidity decreases, and the indoor humidity may be lower than the first preset humidity. When the indoor temperature is lower than the first preset temperature and the indoor humidity is not lower than the first preset humidity, the controller controls the humidifier to be turned on, so that the indoor humidity is not lower than the first preset humidity, and the release of formaldehyde in the indoor furniture into the air is increased. In combination with increasing the frequency of the compressor to increase the indoor temperature, the indoor environment with high temperature and high humidity can further promote the release of formaldehyde in the indoor furniture.

[0226] When the indoor temperature sensor detects that the indoor temperature is lower than the first preset temperature, and the indoor humidity sensor detects that the indoor humidity is lower than the first preset humidity, the controller controls the compressor to increase the operating frequency, and the controller controls the humidifier to be turned on.

[0227] The controller controls the compressor to increase the heat exchange amount of the indoor heat exchanger by increasing the frequency of the compressor, so that the indoor air is heated by the indoor heat exchanger when the indoor air flows through the indoor heat exchanger, and the heated indoor air flows to the indoor environment through the heat exchange air outlet, thereby increasing the indoor temperature.

[0228] When the indoor humidity is lower than the first preset humidity, the controller controls the humidifier to be turned on, so that the indoor humidity increases, and the indoor environment with high humidity can increase the release of formaldehyde in the indoor furniture into the air. In combination with increasing the frequency of the compressor to increase the indoor temperature, the indoor environment with high temperature and high humidity can further promote the release of formaldehyde in the indoor furniture.

[0229] When the indoor temperature sensor detects that the indoor temperature is not lower than the first preset temperature, and the indoor humidity sensor detects that the indoor humidity is lower than the first preset humidity, the operating frequency of the compressor remains unchanged, and the indoor heat exchanger remains in the current heating state to satisfy that the indoor temperature is not lower than the first preset temperature, and the humidifier is controlled to be turned on.

[0230] The controller controls the humidifier to be turned on, so that the indoor humidity increases, and the indoor environment with high humidity can increase the release of formaldehyde in the indoor furniture into the air. In combination with the heating of the indoor heat exchanger to increase the indoor temperature, the indoor environment with high temperature and high humidity can further promote the release of formaldehyde in the indoor furniture.

[0231] When the indoor temperature sensor detects that the indoor temperature is not lower than the first preset temperature, and the indoor humidity sensor detects that the indoor humidity is not lower than the first preset humidity, the compressor stops operating, and the indoor heat exchanger stops operating to save energy. The humidifier is controlled to stop operating, and the heat exchange fan is controlled to operate at the upper limit value of the rated power range of the heat exchange fan.

[0232] The controller controls the humidifier to stop running, so that when the indoor humidity is not lower than the first preset humidity, the indoor environment can be kept as a high-humidity environment in time without starting the humidifier, thereby saving energy consumption, and the indoor environment with high temperature and high humidity can further promote the release of formaldehyde in indoor furniture.

[0233] The control heat exchanger fan to run at the upper limit value of the rated power range of the heat exchanger fan, which can promote the flow of indoor air and improve the disturbance effect of indoor air, thereby promoting the release of formaldehyde in furniture into indoor air.

[0234] When the indoor temperature sensor detects that the indoor temperature is not lower than the first preset temperature and the indoor humidity sensor detects that the indoor humidity is not lower than the first preset humidity, the controller controls the indoor and outdoor guide vanes to rotate to the minimum wind blocking position, so as to reduce the resistance of indoor air flowing out of the heat exchange air outlet and improve the disturbance effect of the air conditioner on indoor air.

[0235] When the air conditioner indoor unit runs the formaldehyde removal mode and the indoor heat exchanger works as a condenser, when the indoor temperature sensor detects that the indoor temperature is not lower than the first preset temperature and the indoor humidity sensor detects that the indoor humidity is not lower than the first preset humidity, the controller controls the formaldehyde concentration sensor to be turned on.

[0236] With the increase of formaldehyde concentration, when the formaldehyde concentration sensor detects that the increase of indoor formaldehyde concentration in a preset time period is less than a first preset range, the current indoor formaldehyde concentration is defined as a first preset concentration, and the fresh air fan is controlled to run at the upper limit value of the rated power range of the fresh air fan.

[0237] When the formaldehyde concentration sensor detects that the increase of indoor formaldehyde concentration in a preset time period is less than a first preset range, it is considered that the indoor formaldehyde concentration reaches an equilibrium state, which means that the formaldehyde concentration changes little in the preset time period. At this time, the fresh air fan is controlled to run at the upper limit value of the rated power range, i.e., the fresh air fan runs at the maximum speed, which can quickly reduce the indoor formaldehyde concentration and improve the formaldehyde removal efficiency.

[0238] With the fresh air fan running, when the formaldehyde concentration sensor detects that the indoor formaldehyde concentration decreases by a first decrease amplitude from the first preset concentration, the fresh air fan is controlled to run at a fourth power lower than the upper limit value of the rated power range of the fresh air fan.

[0239] With the fresh air fan running, the outdoor fresh air is gradually introduced into the indoor, the indoor formaldehyde concentration is diluted and gradually decreases, and the introduction of fresh air has a greater and greater influence on the indoor temperature and humidity, and the indoor temperature and humidity gradually decrease with the introduction of fresh air.

[0240] The new air runs at a high speed for a long time, which consumes more energy and generates more noise. When the indoor formaldehyde concentration is continuously reduced, maintaining a large amount of new air input for a long time has a greater impact on the indoor temperature and humidity.

[0241] To achieve the preset indoor temperature, the compressor needs to continuously adjust the operating frequency of the compressor to provide sufficient heat exchange for the indoor heat exchanger. Frequent switching of the operating frequency of the compressor can cause the service life of the compressor to attenuate, and also cause high energy consumption.

[0242] Therefore, in order to maximize the service life of the compressor and reduce the impact of operating noise, the amount of new air input in the de-aldehyde cycle is adjusted in stages. The speed of the new air fan is adjusted in stages according to the change in the formaldehyde concentration, thereby achieving the purpose of adjusting the amount of new air input.

[0243] It can be provided that the first decrease amplitude of the first preset concentration is set to half of the first preset concentration. That is, when the indoor formaldehyde concentration is detected to be lower than half of the first preset concentration, the new air fan is controlled to operate at a fourth power lower than the upper limit value of the rated power range of the new air fan.

[0244] In some embodiments, as the new air fan is turned on, the indoor formaldehyde concentration gradually decreases. When the indoor formaldehyde concentration is detected to be lower than a second decrease amplitude of the first preset concentration, the controller controls the new air fan to operate at a fifth power lower than the upper limit value of the rated power range of the new air fan. The fifth power is less than the fourth power, and the second decrease amplitude of the first preset concentration is less than the first decrease amplitude of the first preset concentration.

[0245] In order to maximize the service life of the compressor and reduce the impact of operating noise, the amount of new air input in the de-aldehyde cycle is adjusted in stages. The speed of the new air fan is adjusted in stages according to the change in the formaldehyde concentration, thereby achieving the purpose of adjusting the amount of new air input. By adjusting the speed of the new air fan in stages, the indoor temperature fluctuation is small, the frequency switching of the compressor is avoided, the service life of the compressor is improved, and the noise of the new air fan in operation is reduced.

[0246] It can be provided that when the de-aldehyde mode is running, the human sensing sensor detects that the user returns home again, and the user adjusts the air conditioner to other operating modes. That is, when the de-aldehyde mode is running, the controller receives an instruction to operate in other modes, the controller controls the formaldehyde concentration sensor to detect the indoor formaldehyde concentration. When the indoor formaldehyde concentration is not lower than the second preset concentration, the de-aldehyde module is turned on, and the indoor air flows through the de-aldehyde module to purify the formaldehyde in the indoor air and reduce the indoor formaldehyde concentration.

[0247] When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration drops below the second preset concentration, the controller controls the heat exchange fan to operate at a second power lower than the upper limit of the rated power range of the heat exchange fan, and controls the fresh air fan to operate at a third power lower than the upper limit of the rated power range of the fresh air fan. At this time, the indoor formaldehyde concentration is low and will not harm the human body, and reducing the power of the heat exchange fan and the fresh air fan can save the energy consumption of the air conditioner.

[0248] When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration drops below the second preset concentration, the adjustment of each component of the air conditioner follows the instruction sent by the user, that is, the air conditioner can operate in the corresponding mode according to the instruction issued by the user.

[0249] It can be provided that when the indoor formaldehyde concentration is not lower than the second preset concentration, the instruction from the user will be shielded and will not have any effect until the indoor formaldehyde concentration is lower than the second preset concentration, and the controller will respond to the user's instruction. It should be noted that when the indoor formaldehyde concentration is not lower than the second preset concentration, if the user performs an interference operation, there will be a corresponding reminder, including a voice reminder or a software prompt of intelligent interconnection, and the user can perform the operation only when the indoor formaldehyde concentration is lower than the second preset concentration.

[0250] When a certain formaldehyde removal cycle ends and the next cycle has not started, the indoor heat exchanger works as a condenser at this time. When the controller receives a command to close the formaldehyde removal mode, the controller controls the human presence sensor to detect whether there is anyone in the room.

[0251] When the human presence sensor detects that there is no one in the room, the fresh air fan is controlled to stop operating, and the indoor heat exchanger is controlled to work as an evaporator, so that the indoor heat exchanger performs dehumidification. In order to prevent the indoor formaldehyde concentration from being high at this time, by operating the dehumidification mode, when the indoor air flows through the indoor evaporator, the formaldehyde in the indoor air condenses in the condensed water along with the moisture in the air, and the formaldehyde is discharged to the outdoor along with the condensed water, thereby reducing the indoor formaldehyde concentration and the indoor humidity.

[0252] When it is detected that the indoor formaldehyde concentration is lower than the second preset concentration, the indoor formaldehyde concentration is low at this time, and the formaldehyde removal cycle does not need to be performed, and the compressor is controlled to stop operating.

[0253] When the air conditioner operates in the dehumidification mode, the air conditioner performs the dehumidification cycle of the air conditioner indoor unit by using the compressor, the outdoor heat exchanger, the expansion valve and the indoor heat exchanger.

[0254] The dehumidification cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been adjusted and heat exchanged, provides cold energy to the indoor space through the heat absorption process of the refrigerant, and realizes temperature adjustment of the indoor space.

[0255] The compressor compresses the refrigerant gas in a low-temperature and low-pressure state to discharge refrigerant gas in a high-temperature and high-pressure state. The discharged refrigerant gas flows into the outdoor heat exchanger. The outdoor heat exchanger condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0256] The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the outdoor heat exchanger into a low-pressure liquid-phase refrigerant.

[0257] The indoor 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 indoor heat exchanger can achieve a refrigeration effect by exchanging heat with indoor air using the latent heat of evaporation of the refrigerant.

[0258] During the entire dehumidification cycle, the air conditioner indoor unit can condense the moisture in the indoor air into condensed water, thereby reducing the indoor humidity.

[0259] When a certain de-aldehyde cycle ends and the next cycle is not started, the indoor heat exchanger works as a condenser at this time. When the controller receives a command to turn off the de-aldehyde mode, the controller controls the human presence sensor to detect whether there is a person in the room.

[0260] When the human presence sensor detects that there is a person in the room, the fresh air fan is controlled to operate at a first power lower than the upper limit of the rated power range of the fresh air fan, and the indoor heat exchanger is controlled to work as an evaporator to dehumidify the indoor heat exchanger. When it is detected that the indoor formaldehyde concentration is lower than the second preset concentration, the compressor and the fresh air fan are controlled to stop operating.

[0261] By starting the fresh air fan, it can prevent the indoor formaldehyde concentration from being lower than the second preset concentration but lower than the preset amplitude of the second preset concentration at this time, and high-concentration formaldehyde can cause harm to the human body. Switching the fresh air fan to operate at the first power can prevent the rapid introduction of a large amount of outdoor air from causing a large impact on the indoor space heat load and causing discomfort to the human body.

[0262] At this time, the indoor heat exchanger is controlled to work as an evaporator to dehumidify the indoor heat exchanger. To prevent the indoor formaldehyde concentration from being high at this time, by operating the dehumidification mode, when the indoor air flows through the indoor evaporator, the formaldehyde in the indoor air condenses in the condensed water along with the moisture in the air, and the formaldehyde is discharged to the outdoor along with the condensed water, thereby reducing the indoor formaldehyde concentration and the indoor humidity, so that the indoor humidity is lower than the second preset humidity to avoid discomfort to the user. The value of the second preset humidity can be set to 50%.

[0263] When it is detected that the indoor formaldehyde concentration is lower than the second preset concentration, the indoor formaldehyde concentration is low at this time and will not cause harm to the human body, and the controller controls the compressor and the fresh air fan to stop operating, which can save the energy consumption of the air conditioner.

[0264] It can be provided that when a certain aldehyde removal cycle ends and the next cycle does not start, the indoor heat exchanger works as a condenser at this time. When the controller receives a command to close the aldehyde removal mode, the controller controls the human sensor to detect whether there is a person in the room.

[0265] When the aldehyde removal module is provided in the air conditioner indoor unit, the human sensor detects that there is a person in the room, the controller controls to start the aldehyde removal module to run for a second preset time, and the second preset time can be set to thirty minutes. Thus, when the indoor air flows through the aldehyde removal module, the aldehyde removal module purifies the formaldehyde in the air, thereby rapidly reducing the indoor formaldehyde concentration and avoiding harm to the human body.

[0266] At the same time, the fresh air fan is controlled to run at a first power lower than the upper limit of the rated power range of the fresh air fan, and the indoor heat exchanger is controlled to work as an evaporator to dehumidify the indoor heat exchanger. When it is detected that the indoor formaldehyde concentration is lower than the second preset concentration, the compressor and the fresh air fan are controlled to stop running.

[0267] When it is detected that the indoor formaldehyde concentration is lower than the second preset concentration, the indoor formaldehyde concentration is low at this time and will not cause harm to the human body, the controller controls the compressor and the fresh air fan to stop running, and controls the aldehyde removal module to close running, which can save the energy consumption of the air conditioner.

[0268] When the aldehyde removal mode is closed, the controller controls the air conditioner to issue a voice reminder, or issues a prompt through the software of intelligent interconnection, or controls the aldehyde removal indicator light on the display panel to be turned off, thereby reminding the user that the aldehyde removal mode has been closed. When the aldehyde removal mode is started, the aldehyde removal indicator light on the display panel is turned on.

[0269] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. An air conditioner, characterized in that, It includes: Air conditioner indoor unit and air conditioner outdoor unit; The indoor unit of the air conditioner includes: The casing has a heat exchange air outlet; An indoor heat exchanger is installed inside the housing. The refrigerant flowing inside the refrigerant 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. A humidifier is disposed inside the housing, the humidifier is used to generate steam, the steam flows to the outside of the housing through the heat exchange outlet; Indoor temperature sensor, used to detect indoor temperature; Indoor humidity sensor, used to detect indoor humidity; The outdoor unit of the air conditioner includes at least a compressor, and the compressor is connected to the indoor heat exchanger via a refrigerant circuit. A heat exchange fan is used to deliver indoor air into the room through the heat exchange outlet; Fresh air fans are used to deliver fresh outdoor air into indoor spaces. Formaldehyde concentration sensor, used to detect indoor formaldehyde concentration; The controller is configured as follows: When the indoor heat exchanger is working as a condenser, the indoor temperature sensor is controlled to detect the indoor temperature, and the indoor humidity sensor is controlled to detect the indoor humidity. When the indoor temperature is lower than the first preset temperature and the indoor humidity is not lower than the first preset humidity, the operating frequency of the compressor is increased and the humidifier is turned on. When the indoor heat exchanger is working as a condenser, the indoor temperature sensor is controlled to detect the indoor temperature, and the indoor humidity sensor is controlled to detect the indoor humidity. When the indoor temperature is not lower than the first preset temperature and the indoor humidity is not lower than the first preset humidity, the operating frequency of the compressor is kept constant, the operating state of the humidifier is kept constant, and the formaldehyde concentration sensor is turned on. The heat exchange fan is controlled to operate at the upper limit of its rated power range, and the fresh air fan is controlled to operate at the upper limit of its rated power range. When the formaldehyde concentration sensor detects that the increase in indoor formaldehyde concentration within a preset time period is less than a first preset range, the current indoor formaldehyde concentration is defined as the first preset concentration, and the fresh air fan is controlled to operate at the upper limit of the rated power range of the fresh air fan. When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is lower than the first decrease value of the first preset concentration, it controls the fresh air fan to operate at a fourth power value lower than the upper limit of the rated power range of the fresh air fan.

2. The air conditioner according to claim 1, characterized in that, The controller is configured to: When the indoor heat exchanger is working as a condenser, the indoor temperature sensor is controlled to detect the indoor temperature, and the indoor humidity sensor is controlled to detect the indoor humidity. When the indoor temperature is lower than the first preset temperature and the indoor humidity is lower than the first preset humidity, the operating frequency of the compressor is increased and the humidifier is turned on.

3. The air conditioner according to claim 1, characterized in that, The controller is configured to: When the indoor heat exchanger is working as a condenser, the indoor temperature sensor is controlled to detect the indoor temperature, and the indoor humidity sensor is controlled to detect the indoor humidity. When the indoor temperature is not lower than the first preset temperature and the indoor humidity is lower than the first preset humidity, the operating frequency of the compressor is kept constant, and the humidifier is turned on.

4. The air conditioner according to claim 1, characterized in that, The controller is configured to control the indoor heat exchanger to operate as a condenser when the controller obtains that the current date is a preset date.

5. The air conditioner according to claim 1, characterized in that, Also includes: The controller is configured to: When the indoor temperature is not lower than the first preset temperature and the indoor humidity is not lower than the first preset humidity, the formaldehyde concentration sensor is turned on after a preset first time. When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is lower than the second preset concentration, it controls the fresh air fan to stop running and controls the indoor heat exchanger and humidifier to maintain working status. When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is not lower than the preset amplitude of the second preset concentration, it controls the fresh air fan to turn on.

6. The air conditioner according to claim 1, characterized in that, Also includes: Human presence sensors are used to detect whether someone is indoors. The controller is configured to: When the human sensor detects that someone is in the room and the indoor formaldehyde concentration is not lower than the second preset concentration, the operating frequency of the compressor is reduced, the humidifier is stopped, the heat exchange fan is operated at the upper limit of its rated power range, and the fresh air fan is operated at the upper limit of its rated power range.

7. The air conditioner according to claim 1, characterized in that, Also includes: Human presence sensors are used to detect whether someone is indoors. The controller is configured to: When the indoor heat exchanger operates as a condenser, and the human sensor detects that someone is in the room, it controls the fresh air fan to operate at a first power lower than the upper limit of the rated power range of the fresh air fan, and controls the indoor heat exchanger to operate as an evaporator to dehumidify. When the indoor formaldehyde concentration is detected to be lower than the second preset concentration, it controls the compressor and the fresh air fan to stop operating.

8. The air conditioner according to claim 1, characterized in that, Also includes: Human presence sensors are used to detect whether there are people indoors; The controller is configured to: When the indoor heat exchanger is working as a condenser, and the human sensor detects that no one is in the room, it controls the fresh air fan to stop running and controls the indoor heat exchanger to work as an evaporator to dehumidify. When the indoor formaldehyde concentration is detected to be lower than the second preset concentration, it controls the compressor to stop running.

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