Air conditioner

Abstract

The invention relates to an air conditioner which comprises an air conditioner indoor unit and an air conditioner outdoor unit. The air conditioner indoor unit comprises a shell; an indoor heat exchanger; a heat exchange fan; a humidifier; a human sensor; an indoor temperature sensor; an indoor humidity sensor; a formaldehyde concentration sensor; the air conditioner outdoor unit at least comprises a compressor, and the compressor communicates with the indoor heat exchanger through a refrigerant loop. And the controller is configured to control to reduce the running frequency of the compressor and control the humidifier to stop running when the indoor heat exchanger works as a condenser and the human sensor detects that a person is in a room and the indoor formaldehyde concentration is not lower than a second preset concentration. 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; and when the indoor formaldehyde concentration is lower than the second preset concentration, the operation power of the heat exchange fan and the fresh air fan is controlled to be reduced, so that the formaldehyde release and formaldehyde removal effects are improved.

Description

Technical Field

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

[0002] At present, with the improvement of people's quality of life and living standards, health has become an increasingly important factor in the family scene. For the home appliance market, more and more home appliances are developing around the theme of "health". Formaldehyde has become the number one killer affecting the health of family scenes, and more and more users are beginning to look for reliable and effective ways to remove formaldehyde. As a primary carcinogen, formaldehyde mainly exists in two forms indoors. The formaldehyde in furniture panels is bound formaldehyde, and the formaldehyde in indoor air is free formaldehyde. The bound formaldehyde in furniture panels will gradually be released into the air at room temperature, continuously increasing the content of free formaldehyde in the air, exacerbating the threat to human health. At present, there is no mature technology that can completely remove the formaldehyde contained in furniture panels in a short period of time.

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

[0004] The indoor unit of the air conditioner includes a housing, an indoor heat exchanger and a formaldehyde removal filter. The housing is provided with a heat exchange outlet. The indoor heat exchanger is arranged inside the housing. The refrigerant flowing inside the housing exchanges heat with the indoor air to form a heating cycle or a cooling cycle. After the heat exchange, the indoor air flows to the outside of the housing through the heat exchange outlet. The formaldehyde removal filter is used to absorb formaldehyde in the indoor air. The formaldehyde removal filter has a service life and needs to be replaced frequently.

[0005] Some air conditioner indoor units also include a humidifier to increase the indoor humidity, but it is not disclosed that the humidifier can be used in conjunction with an indoor heat exchanger to remove formaldehyde.

[0006] In the related art, formaldehyde gas in the indoor air is removed by passing indoor air through a formaldehyde removal filter. However, formaldehyde is currently removed through the indoor unit of the air conditioner. The method of removing formaldehyde is single, the efficiency of formaldehyde removal is low, and the formaldehyde removal filter needs to be replaced frequently. It is impossible to implement different formaldehyde removal methods according to different indoor formaldehyde concentrations and whether there is someone indoors. Summary of the invention

[0007] The present invention solves one of the technical problems in the related art at least to a certain extent.

[0008] To this end, the present application aims to provide an air conditioner so that corresponding formaldehyde removal methods can be implemented according to different indoor formaldehyde concentrations and whether there is someone indoors, so as to ensure that the formaldehyde removal effect and the energy consumption of the air conditioner are optimal.

[0009] To achieve the above object, the present invention provides an air conditioner, comprising:

[0010] Air conditioner indoor unit and air conditioner outdoor unit;

[0011] The air conditioner indoor unit comprises:

[0012] A shell body having a heat exchange outlet;

[0013] An indoor heat exchanger is arranged inside the shell, and the refrigerant flowing inside the indoor heat exchanger exchanges heat with the indoor air to form a heating cycle or a cooling cycle, and the indoor air flows to the outside of the shell through the heat exchange outlet after the heat exchange;

[0014] A heat exchange fan, used to drive the indoor air to be transported to the indoor through the heat exchange air outlet;

[0015] A humidifier, which is disposed in the housing, and is used to generate steam, and the steam flows to the outside of the housing through the heat exchange air outlet;

[0016] Human sensor, used to detect whether there is someone in the room;

[0017] Indoor temperature sensor, used to detect indoor temperature;

[0018] Indoor humidity sensor, used to detect indoor humidity;

[0019] Formaldehyde concentration sensor, used to detect indoor formaldehyde concentration;

[0020] The air conditioner outdoor unit at least comprises a compressor, and the compressor is connected to the indoor heat exchanger via a refrigerant circuit;

[0021] The controller is configured to: when the indoor heat exchanger works as a condenser, when the presence of a person in the room is detected by the human sensor and the indoor formaldehyde concentration is not lower than a second preset concentration, control the compressor to reduce the operating frequency, control the humidifier to stop operating, control the heat exchange fan to operate at an upper limit of the rated power range of the heat exchange fan, and control the fresh air fan to operate at an upper limit of the rated power range of the fresh air fan;

[0022] When the indoor formaldehyde concentration is lower than a second preset concentration, the operating powers of the heat exchange fan and the fresh air fan are controlled to be reduced.

[0023] In the present application, if the human sensor detects that there is no one in the room, and the indoor heat exchanger works as a condenser to perform a formaldehyde removal cycle, if the controller receives an instruction to run other modes, the operating power of the heat exchange fan is controlled to be reduced so that the heat exchange fan runs at a low speed. The operating frequency of the compressor is controlled to be reduced, thereby reducing the heating capacity of the indoor heat exchanger. The operating power of the fresh air fan is controlled to be increased so that the fresh air fan maintains high-speed operation, thereby discharging the residual formaldehyde content in the room to the outside. The indoor heat exchanger is controlled to work as an evaporator, so that the indoor heat exchanger dehumidifies and reduces the indoor humidity. When it is detected that the indoor formaldehyde concentration is reduced to below the second preset concentration, the compressor, the heat exchange fan and the fresh air fan are controlled to stop running.

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

[0025] When the indoor heat exchanger works 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;

[0026] 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 controlled to increase.

[0027] In some embodiments of the present application, the controller is configured to:

[0028] When the indoor heat exchanger works 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;

[0029] When the indoor temperature is lower than a first preset temperature and the indoor humidity is lower than a first preset humidity, the operating frequency of the compressor is controlled to be increased and the humidifier is controlled to be turned on.

[0030] In some embodiments of the present application, the controller is configured to:

[0031] When the indoor heat exchanger works 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;

[0032] 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 controlled to remain unchanged and the humidifier is controlled to be turned on.

[0033] In some embodiments of the present application, the controller is configured to:

[0034] When the indoor heat exchanger works 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;

[0035] When the indoor temperature is not lower than a first preset temperature and the indoor humidity is not lower than a first preset humidity, the operating frequency of the compressor is controlled to remain unchanged, the operating state of the humidifier is controlled to remain unchanged, and the heat exchange fan is controlled to operate at the upper limit of the rated power range of the heat exchange fan.

[0036] In some embodiments of the present application, a fresh air fan is used to deliver outdoor fresh air to indoors;

[0037] The controller is configured to:

[0038] When the indoor heat exchanger works as a condenser and detects that the indoor temperature is not lower than a first preset temperature and the indoor humidity is not lower than a first preset humidity, controlling to turn on the formaldehyde concentration sensor;

[0039] When the formaldehyde concentration sensor detects that the growth value of the indoor formaldehyde concentration within a preset time period is less than a first preset range, the fresh air fan is controlled to operate at an upper limit value of the rated power range of the fresh air fan.

[0040] In some embodiments of the present application, it also includes:

[0041] Fresh air fan, used to transport outdoor fresh air to indoor areas;

[0042] The controller is configured to:

[0043] When the indoor heat exchanger works as a condenser and the human sensing sensor detects that there is no one in the room, the operating power of the heat exchange fan is controlled to be reduced, the operating power of the fresh air fan is controlled to be increased, 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 a second preset concentration, the compressor, the heat exchange fan and the fresh air fan are controlled to stop running.

[0044] In some embodiments of the present application, the controller is configured to:

[0045] When the indoor heat exchanger works as a condenser and a person is detected in the room by the human sensing sensor, the heat exchange fan is controlled to operate at a first power lower than the upper limit of the rated power of the heat exchange fan, the fresh air fan is controlled to operate at a second power lower than the upper limit of the rated power of the fresh air fan, and the indoor heat exchanger is controlled to work as an evaporator to dehumidify the indoor heat exchanger.

[0046] In some embodiments of the present application, the controller is configured to: when the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is lower than a second preset concentration, control the fresh air fan to stop running.

[0047] Another aspect of the present invention provides an air conditioner, comprising:

[0048] Air conditioner indoor unit and air conditioner outdoor unit;

[0049] The air conditioner indoor unit comprises:

[0050] A shell body having a heat exchange outlet;

[0051] An indoor heat exchanger is arranged inside the shell, and the refrigerant flowing inside the indoor heat exchanger exchanges heat with the indoor air to form a heating cycle or a cooling cycle, and the indoor air flows to the outside of the shell through the heat exchange outlet after the heat exchange;

[0052] A heat exchange fan, used to drive the indoor air to be transported to the indoor through the heat exchange air outlet;

[0053] A humidifier, which is disposed in the housing, and is used to generate steam, and the steam flows to the outside of the housing through the heat exchange air outlet;

[0054] A formaldehyde removal module, used to remove formaldehyde in the air flowing through the formaldehyde removal module;

[0055] Human sensor, used to detect whether there is someone in the room;

[0056] Indoor temperature sensor, used to detect indoor temperature;

[0057] Indoor humidity sensor, used to detect indoor humidity;

[0058] Formaldehyde concentration sensor, used to detect indoor formaldehyde concentration;

[0059] The air conditioner outdoor unit at least comprises a compressor, and the compressor is connected to the indoor heat exchanger via a refrigerant circuit;

[0060] The controller is configured to: when the indoor heat exchanger works as a condenser, when the presence of a person in the room is detected by the human sensor and the indoor formaldehyde concentration is not lower than a second preset concentration, control to turn on the formaldehyde removal module, control to reduce the operating frequency of the compressor, control to stop the humidifier, control the heat exchange fan to operate at the upper limit of the rated power range of the heat exchange fan, and control the fresh air fan to operate at the upper limit of the rated power range of the fresh air fan;

[0061] When the indoor formaldehyde concentration is lower than a second preset concentration, the operating powers of the heat exchange fan and the fresh air fan are controlled to be reduced.

[0062] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 is a schematic diagram of the overall structure of an air conditioner according to one embodiment of the present application;

[0064] Figure 2 This is a schematic diagram of the overall structure of a wall-mounted air conditioner indoor unit according to one embodiment of the present application. Figure 1 ;

[0065] Figure 3 This is a schematic diagram of the overall structure of a wall-mounted air conditioner indoor unit according to one embodiment of the present application. Figure 2 ;

[0066] Figure 4 This is a flowchart of the operation of an indoor unit of an air conditioner according to one embodiment of the present application when a person is detected indoors;

[0067] Figure 5 This is a flowchart of the operation when an indoor unit of an air conditioner detects that no one is indoors according to one embodiment of the present application;

[0068] Figure 6 This is the workflow of the formaldehyde removal cycle of the air conditioner indoor unit in one embodiment of the present application when operating in the heating mode Figure 1 ;

[0069] Figure 7 This is the workflow of the formaldehyde removal cycle of the air conditioner indoor unit in one embodiment of the present application when operating in the heating mode Figure 2 ;

[0070] Figure 8 This is the workflow of the formaldehyde removal cycle of the air conditioner indoor unit in one embodiment of the present application when operating in the heating mode Figure 3 ;

[0071] Fig. 9 This is the working process of the indoor unit of the air conditioner in the heating mode according to one embodiment of the present application. Figure 4 ;

[0072] Fig.10 This is a working flow diagram of an air conditioner indoor unit according to one embodiment of the present application when formaldehyde reaches an equilibrium state;

[0073] Fig.11 This is the working process of the air conditioner indoor unit in the cooling mode according to one embodiment of the present application. Figure 1 ;

[0074] Fig.12 This is the working process of the indoor unit of the air conditioner in the cooling mode according to one embodiment of the present application. Figure 2 ;

[0075] Fig.13 This is the working process of the indoor unit of the air conditioner in the cooling mode according to one embodiment of the present application. Figure 3 ;

[0076] Fig.14 This is the working process of the indoor unit of the air conditioner in the cooling mode according to one embodiment of the present application. Figure 4 ;

[0077] Fig.15 This is the working process of the indoor unit of the air conditioner in the cooling mode according to one embodiment of the present application. Figure 5 ;

[0078] Fig.16 This is the working process of the indoor unit of the air conditioner in the cooling mode according to one embodiment of the present application. Figure 6 .

[0079] In the above figures: housing 100; air conditioner outdoor unit 200. DETAILED DESCRIPTION

[0080] In the description of the present invention, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0081] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0083] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0084] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0085] 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 refrigeration cycle of the air conditioner indoor unit by using a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger.

[0086] The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air, provides cooling to the indoor space through the heat absorption process of the refrigerant, and achieves temperature regulation of the indoor space.

[0087] The compressor compresses the low-temperature and low-pressure refrigerant gas and discharges the high-temperature and high-pressure refrigerant gas, which flows into the outdoor heat exchanger. The outdoor heat exchanger condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0088] The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the outdoor heat exchanger into a low-pressure liquid-phase refrigerant.

[0089] 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 cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the indoor air.

[0090] During the entire refrigeration cycle, the air conditioner indoor unit can adjust the temperature of the indoor space.

[0091] When the air conditioner operates in heating mode, the air conditioner performs a heating cycle of the air conditioner indoor unit through the compressor, outdoor heat exchanger, expansion valve and indoor heat exchanger.

[0092] The heating cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air, provides heat to the indoor space through the heat release process of the refrigerant, and realizes temperature regulation of the indoor space.

[0093] When the heating cycle is running, the compressor compresses the low-temperature and low-pressure refrigerant gas and discharges the high-temperature and high-pressure refrigerant gas, which flows into the indoor heat exchanger. The indoor heat exchanger condenses the compressed refrigerant into a liquid phase, and the heat generated by the condensation is exchanged with the indoor air flowing through the indoor heat exchanger, thereby increasing the indoor temperature.

[0094] The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the outdoor heat exchanger into a low-pressure liquid-phase refrigerant.

[0095] The outdoor heat exchanger evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low temperature and low pressure state to the compressor. The outdoor heat exchanger may perform heat exchange with outdoor air by utilizing latent heat of evaporation of the refrigerant.

[0096] Throughout the heating cycle, the air conditioner indoor unit regulates the temperature of the indoor space.

[0097] The air conditioner outdoor unit 200 includes at least a compressor and an outdoor heat exchanger, the air conditioner indoor unit includes at least an indoor heat exchanger, and the expansion valve may be provided in the air conditioner indoor unit or the air conditioner outdoor unit 200 .

[0098] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner indoor unit functions as a heater in a heating mode, and when the indoor heat exchanger functions as an indoor heat exchanger, the air conditioner indoor unit functions as a cooler in a cooling mode.

[0099] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0100] As attached Figures 1 to 15 As shown, in one embodiment of the air conditioner of the present invention.

[0101] The air conditioner includes an air conditioner indoor unit and an air conditioner outdoor unit 200 . The air conditioner outdoor unit 200 includes a compressor and an outdoor heat exchanger. The air conditioner indoor unit includes an indoor heat exchanger. The expansion valve can be provided in the air conditioner indoor unit or the air conditioner outdoor unit 200 .

[0102] The air conditioner of the present application includes an indoor heat exchanger, an outdoor heat exchanger, a compressor, an expansion valve, and a pipeline for circulating refrigerant, wherein 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 a low-pressure liquid refrigerant.

[0103] The compressor includes an air intake port and an air exhaust port. The refrigerant that absorbs heat and undergoes an evaporation process enters the compressor from the air intake port. The compressor compresses the gaseous refrigerant into a high-temperature and high-pressure state and then discharges it from the exhaust port.

[0104] The indoor heat exchanger and the outdoor heat exchanger are respectively connected to the compressor through a four-way valve in the refrigerant circuit, and the four-way valve includes a first valve port, a second valve port, a third valve port and a fourth valve port. Among them, the air intake port of the compressor is fixedly connected to the first valve port, and the air discharge port of the compressor is fixedly connected to the third valve port.

[0105] In the refrigerant circuit, the refrigerant can circulate through the compressor, indoor heat exchanger, expansion valve, and outdoor heat exchanger in sequence.

[0106] When the air conditioner is in cooling mode, the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port. When the air conditioner is in heating mode, the first valve port is connected to the fourth valve port, and the second valve port is connected to the third valve port.

[0107] 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.

[0108] 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 .

[0109] The housing 100 is provided with an indoor air inlet, an outdoor air inlet, a heat exchange outlet and a fresh air outlet.

[0110] The indoor heat exchanger is disposed inside the housing 100 , and the refrigerant flowing inside the indoor heat exchanger exchanges heat with the indoor air to form a heating cycle or a cooling cycle. After passing through the indoor heat exchanger, the indoor air flows to the outside of the housing 100 through the heat exchange outlet.

[0111] The heat exchange fan can be a cross-flow fan. When the heat exchange fan is started, the indoor air is introduced into the housing 100 through the drive of the heat exchange fan. The heat exchange fan is used to provide power for the indoor air to flow from the indoor air inlet through the housing 100 to the heat exchange outlet. The heat exchange fan includes a heat exchange fan and a heat exchange drive motor. The heat exchange drive motor drives the heat exchange fan to rotate.

[0112] Indoor air enters the housing 100 through the indoor air inlet, exchanges heat with the heat exchanger, and then flows out from the heat exchange outlet on the housing 100 to the indoor space, thereby achieving indoor air supply.

[0113] The humidifier is disposed in the housing 100 , and is used to generate steam. The steam can flow to the outside of the housing 100 through the heat exchange air outlet under the drive of the heat exchange fan.

[0114] The fresh air module is arranged in the space inside the housing 100 of the air conditioner indoor unit, and includes a fresh air casing, on which a fresh air inlet and a fresh air outlet are arranged, and the fresh air inlet is connected to the outdoor air inlet on the housing 100, and a fresh air cavity connected to the fresh air inlet and the fresh air outlet is formed in the fresh air module. The fresh air inlet can be arranged at the top, front side, rear side, left side or right side of the fresh air casing, and correspondingly, the outdoor air inlet can be arranged at the top, front side, rear side, left side or right side of the housing 100 corresponding to the fresh air inlet.

[0115] The fresh air outlet can be arranged around the air conditioning outlet of the housing 100, so that the fresh air can be mixed with the air conditioning air flowing out of the heat exchange outlet when flowing out of the fresh air outlet, so as to reduce the influence of the fresh air on the temperature and humidity of the indoor environment, and improve the comfort of people when using the fresh air module. It can be arranged that the fresh air outlet can also be arranged on the top, front side, rear side, left side or right side of the housing 100.

[0116] The fresh air module includes a fresh air fan arranged in the fresh air cavity. The fresh air fan can be a centrifugal fan. When the fresh air fan is started, outdoor air is introduced into the room through the fresh air module. The fresh air fan is used to provide power for fresh air to flow from the fresh air inlet to the fresh air outlet. The fresh air fan includes a fan and a drive motor. The drive motor drives the fan to rotate.

[0117] The fresh air module also includes a fresh air duct connecting indoor and outdoor areas, and the fresh air duct is correspondingly arranged at the outdoor air inlet.

[0118] In some embodiments, the fresh air duct is installed in the duct installation hole opened on the wall, one end of the fresh air duct faces indoors and is connected to the fresh air inlet of the fresh air module, the other end of the fresh air duct faces outdoors and is provided with an air inlet, and the fresh air duct is connected to the outdoors through the air inlet. Under the action of the fresh air fan, the outdoor fresh air enters the indoor fresh air module from the outdoors along the fresh air duct, and is blown into the indoor from the fresh air outlet, thereby introducing outdoor fresh air into the indoor.

[0119] The indoor temperature sensor is arranged at the indoor air inlet, and the indoor temperature sensor is used to detect the indoor temperature. The indoor humidity sensor is arranged at the indoor air inlet, and the indoor humidity sensor is used to detect the indoor humidity.

[0120] It can be arranged that the indoor temperature sensor and the indoor humidity sensor can adopt an integrated temperature and humidity sensor. The indoor temperature and indoor humidity are detected by the temperature and humidity sensor.

[0121] The formaldehyde concentration sensor is arranged at the heat exchange air outlet, and is used to detect the indoor formaldehyde concentration.

[0122] The human sensing sensor is arranged on the housing 100 to detect whether there is a person in the room. The human sensing sensor may be an infrared human sensing sensor to detect whether there is a person in the room.

[0123] The indoor heat exchanger further includes an inner air guide plate and an outer air guide plate, wherein the inner air guide plate is arranged at the heat exchange air outlet and is located inside the housing 100, and the outer air guide plate is arranged at the heat exchange air outlet of the indoor unit of the air conditioner, and the heat exchange air outlet is connected to the indoor air inlet. Driven by the heat exchange fan, the indoor air enters the housing 100 through the indoor air inlet, flows through the indoor heat exchanger, and is discharged into the indoor space through the heat exchange air outlet.

[0124] When the indoor unit of the air conditioner is a cabinet type indoor unit, the inner air guide plate can swing up and down to sweep the indoor air up and down, and the outer air guide plate can rotate left and right to sweep the indoor air.

[0125] When the indoor unit of the air conditioner is a wall mounted indoor unit, the inner air guide plate can swing back and forth to sweep the indoor air. The outer air guide plate can rotate up and down to sweep the indoor air.

[0126] See also Figure 4-Figure 15 In some embodiments, when the controller receives a command to start the formaldehyde removal mode, the human sensor is turned on to detect whether there is someone in the room.

[0127] When the human sensor detects that there is someone in the room, if the indoor heat exchanger of the air conditioner indoor unit is in working state, the controller controls the working state of the indoor heat exchanger and humidifier to remain unchanged. At this time, the control command of the temperature and humidity of the air conditioner by the formaldehyde removal program is suppressed, and the controller runs with the temperature and humidity currently set by the user as the highest priority.

[0128] After receiving the command to start the formaldehyde removal mode, the controller still operates with the temperature and humidity currently set by the user as the highest priority, so as to avoid discomfort to the user caused by changes in the indoor temperature and humidity control when the dehumidification program is running.

[0129] When the controller receives the command to start the formaldehyde removal mode, if the inner air guide plate and the outer air guide plate are in a non-windless state at this time, the movement state of the inner air guide plate and the outer air guide plate is controlled to remain unchanged, so that the resistance of the indoor air flowing out of the heat exchange outlet is small, ensuring that the indoor air can circulate quickly.

[0130] If the inner air guide plates and the outer air guide plates are in a windless state at this time, the controller controls the speed of the heat exchange fan to maintain the speed currently set by the user, thereby avoiding the discomfort caused to the user by the high speed of the heat exchange fan.

[0131] When the compressor stops running, the user turns on the formaldehyde removal mode. At this time, the controller receives the command to turn on the formaldehyde removal mode. The controller controls the air-conditioning indoor unit to issue a prompt, thereby reminding the user to turn on the air-conditioning first, and then turn on the formaldehyde removal mode, so that the formaldehyde removal mode cannot be started alone, so as to facilitate the normal operation of the formaldehyde removal mode.

[0132] It can be set that, in some embodiments, a reminder sticker can be set on the control panel of the housing 100, or when the user turns on the formaldehyde removal function separately on the control software corresponding to the air conditioner indoor unit, a corresponding prompt message will pop up on the control software. The prompt message can be set to "Please turn on the air conditioner first", so as to remind the user that the air conditioner needs to be turned on first when the formaldehyde removal mode is correctly operated.

[0133] In some embodiments, when the human sensing sensor detects that there is someone in the room, the air conditioner indoor unit is controlled to issue a prompt to remind the user to leave the room within a preset time. After the preset time, the human sensing sensor is controlled to detect whether there is someone in the room again.

[0134] The air conditioner indoor unit issues a prompt in a manner that includes the air conditioner indoor unit issuing a voice prompt or the air conditioner indoor unit issuing a prompt through its control software. The preset time can be set to five minutes.

[0135] When it is detected that there is no one in the room, the controller starts the formaldehyde removal cycle.

[0136] In some embodiments, when the user turns on 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 room during the formaldehyde removal time, and to return after the formaldehyde removal time, which can be set to two hours. This is helpful to avoid the user returning to the room during the formaldehyde removal cycle, when the indoor formaldehyde concentration is high, the indoor temperature and indoor humidity are high, which can easily cause discomfort to the user and is not conducive to the formaldehyde removal cycle.

[0137] 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 by means of, but not limited to, physical adsorption (e.g., adsorption materials such as activated carbon), chemical bonding (e.g., potassium permanganate chemical reaction, etc.), catalytic oxidation (e.g., photocatalytic catalysis, room temperature catalytic catalysis, high temperature catalytic catalysis) and other technical means.

[0138] 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 runs 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's working hours from Monday to Friday.

[0139] When the controller obtains that the current date is not a preset date, it means that this is a holiday, and the holiday refers to Saturday and Sunday.

[0140] The air conditioner can be linked with the smart device in the room to obtain whether the current time is the preset time. The smart device can be a mobile phone, computer or smart voice assistant, and the linkage method can be Bluetooth or cloud transmission.

[0141] When the formaldehyde removal mode is running, if the human sensor detects that there is no one in the room, the controller controls to turn off the formaldehyde removal module. Because the formaldehyde removal module has a limited life, when there is no one in the room, the formaldehyde removal module is set to be turned on intermittently to increase the service life of the formaldehyde removal module, and then at least one formaldehyde removal cycle is performed.

[0142] When the formaldehyde removal mode is turned on, the controller controls the air conditioner to run multiple formaldehyde removal cycles, and the number of formaldehyde removal cycles can be set to four times. Because one formaldehyde removal cycle takes about two hours, and the default working time of a user is eight hours a day, the formaldehyde removal cycle is turned on four times when no one is indoors, and multiple formaldehyde removal cycles can be performed before the user returns to the room, thereby improving the formaldehyde removal efficiency.

[0143] A formaldehyde 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.

[0144] 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.

[0145] The controller increases the heat exchange of the indoor heat exchanger by controlling 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 into the room through the heat exchange air outlet, thereby increasing the indoor temperature. The indoor high temperature and high humidity indoor environment can further promote the release of formaldehyde in indoor furniture.

[0146] 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 to turn on the humidifier.

[0147] The controller increases the heat exchange of the indoor heat exchanger by controlling 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 into the room through the heat exchange outlet, thereby increasing the indoor temperature.

[0148] When the indoor humidity is lower than the first preset humidity, the humidifier can be turned on to increase the indoor humidity. The high humidity indoor environment can increase the release of formaldehyde from the indoor furniture into the air. The indoor temperature can be increased by increasing the compressor frequency. The high temperature and high humidity indoor environment can further promote the release of formaldehyde from the indoor furniture.

[0149] 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 is controlled to remain unchanged, and the indoor heat exchanger maintains the current heating state to ensure that the indoor temperature is not lower than the first preset temperature, and the humidifier is controlled to be turned on at the same time.

[0150] The controller controls the humidifier to increase the indoor humidity. The high humidity indoor environment can increase the release of formaldehyde from indoor furniture into the air. The indoor temperature can be increased by heating with the indoor heat exchanger. The high temperature and high humidity indoor environment can further promote the release of formaldehyde from indoor furniture.

[0151] 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 operating frequency of the compressor is controlled to remain unchanged, and the indoor heat exchanger maintains the current heating state to ensure that the indoor temperature is not lower than the first preset temperature, and to avoid the change of the operating frequency of the compressor causing higher energy consumption. The operating state of the humidifier is controlled to remain unchanged, and the heat exchange fan is controlled to operate at the upper limit of the rated power range of the heat exchange fan.

[0152] The controller controls the humidifier to increase the indoor humidity. The high humidity indoor environment can increase the release of formaldehyde from indoor furniture into the air. The indoor temperature can be increased by heating with the indoor heat exchanger. The high temperature and high humidity indoor environment can further promote the release of formaldehyde from indoor furniture.

[0153] Controlling the heat exchange fan to operate at the upper limit of the rated power range of the heat exchange fan can promote indoor air flow and improve heat exchange between indoor air and indoor heat exchanger, thereby promoting the increase of indoor temperature and continuously heating the indoor air, while keeping the compressor operating frequency unchanged.

[0154] As the formaldehyde concentration increases, when the formaldehyde concentration sensor detects that the growth value of the indoor formaldehyde concentration within the 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.

[0155] When the formaldehyde concentration sensor detects that the growth value of the indoor formaldehyde concentration within the preset time period is less than the first preset range, it is considered that the indoor formaldehyde concentration has reached an equilibrium state, which means that the formaldehyde concentration changes very little within the preset time period. At this time, the fresh air fan is operated at the upper limit of the rated power range, that is, the fresh air fan is operated at the maximum speed, which can quickly reduce the indoor formaldehyde concentration, improve the formaldehyde removal efficiency, and quickly discharge the indoor formaldehyde to the outdoors as much as possible. At this time, a formaldehyde removal cycle ends.

[0156] It can be set that when the indoor temperature sensor detects that the indoor temperature is not lower than a first preset temperature, and the indoor humidity sensor detects that the indoor humidity is not lower than a first preset humidity, the controller controls the inner air guide plate and the outer air guide plate to rotate to the minimum wind blocking position to reduce the resistance of the indoor air flowing out of the heat exchange outlet and improve the disturbance effect of the air conditioner on the indoor air.

[0157] In the step of executing the formaldehyde removal cycle and determining 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 guide plates to rotate to the minimum wind blocking position, so as to reduce the resistance of the indoor air flowing out of the heat exchange outlet, improve the disturbance effect of the air conditioner on the indoor air, and at the same time, when the indoor air flows through the indoor heat exchanger, the air conditioner heats the indoor air, and increases the indoor temperature to facilitate the release of formaldehyde in the indoor furniture into the air.

[0158] In the step of executing the formaldehyde removal cycle and determining 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.

[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.

[0160] The controller increases the heat exchange of the indoor heat exchanger by controlling 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 into the room through the heat exchange outlet, thereby increasing the indoor temperature. The high temperature and high humidity indoor environment can further promote the release of formaldehyde in indoor furniture.

[0161] 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 to turn on the humidifier.

[0162] The controller increases the heat exchange of the indoor heat exchanger by controlling 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 into the room through the heat exchange outlet, thereby increasing the indoor temperature.

[0163] When the indoor humidity is lower than the first preset humidity, the humidifier can be turned on to increase the indoor humidity to not lower than the first preset humidity. The high humidity indoor environment can increase the formaldehyde released from the indoor furniture into the air. The indoor temperature can be increased by increasing the compressor frequency. The high temperature and high humidity indoor environment can further promote the release of formaldehyde from the indoor furniture.

[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 compressor is controlled to stop running, the indoor heat exchanger is controlled to stop running, and the humidifier is controlled to start at the same time.

[0165] The controller controls 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.

[0166] 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 indoor heat exchanger is controlled to maintain the heating state to ensure that the indoor temperature is not lower than the first preset temperature, and to avoid frequent changes in the operating frequency of the compressor resulting in high energy consumption. The heat exchange fan is controlled to operate at the upper limit of the rated power range of the heat exchange fan.

[0167] Controlling the heat exchange fan to operate at the upper limit of the rated power range of the heat exchange fan can promote indoor air flow and improve heat exchange between indoor air and indoor heat exchanger, thereby promoting the increase of indoor temperature and continuously heating the indoor air, while keeping the compressor operating frequency unchanged.

[0168] When the air conditioner indoor unit runs in 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 to turn on the formaldehyde concentration sensor.

[0169] As the formaldehyde concentration increases, when the formaldehyde concentration sensor detects that the growth value of the indoor formaldehyde concentration within the 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.

[0170] When the formaldehyde concentration sensor detects that the growth value of the indoor formaldehyde concentration within the preset time period is less than the first preset range, it is considered that the indoor formaldehyde concentration has reached an equilibrium state, which means that the formaldehyde concentration changes very little within the preset time period. At this time, the fresh air fan is operated at the upper limit of the rated power range, that is, the fresh air fan is operated at the maximum speed, which can quickly reduce the indoor formaldehyde concentration, improve the formaldehyde removal efficiency, and quickly discharge the indoor formaldehyde to the outdoors as much as possible. At this time, a formaldehyde removal cycle ends.

[0171] If the human sensor detects that there is no one in the room, the indoor heat exchanger works as a condenser to perform the formaldehyde removal cycle. If the controller receives an instruction to run other modes, it controls to reduce the operating power of the heat exchange fan so that the heat exchange fan runs at a low speed. The operating frequency of the compressor is controlled to reduce the heating capacity of the indoor heat exchanger.

[0172] The operating power of the fresh air fan is controlled to be increased so that the fresh air fan keeps running at a high speed, thereby discharging the residual formaldehyde content in the room to the outside. The indoor heat exchanger is controlled to work as an evaporator so that the indoor heat exchanger performs dehumidification and reduces the indoor humidity.

[0173] When it is detected that the indoor formaldehyde concentration drops below a second preset concentration, the compressor, the heat exchange fan and the fresh air fan are controlled to stop running.

[0174] At this time, the indoor formaldehyde concentration has dropped to a safe range, and the indoor formaldehyde will not cause harm to the human body. Stopping the fresh air fan can reduce energy consumption. In the process of exhausting indoor formaldehyde to the outside through the fresh air fan, running the dehumidification mode gradually reduces the indoor humidity. Controlling the compressor to stop running to stop the dehumidification mode can reduce energy consumption.

[0175] As the indoor air is discharged to the outside through the fresh air fan, the indoor temperature can be lowered to a level suitable for users. When the indoor formaldehyde concentration has dropped to a safe range, the indoor temperature will gradually drop to a level suitable for users. Stopping the compressor and heat exchange fan can reduce energy consumption.

[0176] When the formaldehyde removal mode is running, the human sensor detects that the user returns home again, and the indoor state changes from unmanned to occupied. When the user does not adjust the air conditioner to other operating modes, that is, when the formaldehyde removal mode is running, the controller does not receive instructions to run other modes, and the controller controls the formaldehyde concentration sensor to detect the indoor formaldehyde concentration. If the indoor formaldehyde concentration is not lower than the second preset concentration at this time, the controller controls the compressor to reduce the operating frequency, controls the humidifier to stop running, controls the heat exchange fan to run at the upper limit of the rated power range of the heat exchange fan, and controls the fresh air fan to run at the upper limit of the rated power range of the fresh air fan.

[0177] The controller controls to reduce the operating frequency of the compressor so that the compressor runs at the first power of the compressor. The first power of the compressor can be set to 50% of the upper limit of the rated power of the compressor. The humidifier is controlled to stop running. Because in the formaldehyde removal mode, the indoor temperature and humidity are increased to promote the rapid release of formaldehyde. The temperature and humidity corresponding to the fastest formaldehyde release efficiency are not the best temperature and humidity state for human comfort. Therefore, the heat exchange needs to be appropriately reduced to lower the indoor temperature. Turning off the humidifier is to quickly reduce the indoor humidity to prevent the indoor high temperature and high humidity environment from causing discomfort to the human body.

[0178] The controller controls the heat exchange fan to operate at the upper limit of the rated power range of the heat exchange fan, and controls the fresh air fan to operate at the upper limit of the rated power range of the fresh air fan, so that the speeds of the heat exchange fan and the fresh air fan both maintain the maximum speeds unchanged, and the inner air guide plate and the outer air guide plate are switched to the wind-avoiding position, so that the indoor formaldehyde concentration is reduced to below the second preset concentration as soon as possible, thereby preventing the indoor formaldehyde from causing harm to indoor users.

[0179] When the indoor formaldehyde concentration is lower than the second preset concentration, the operating power of the heat exchange fan and the fresh air fan is controlled to be reduced, thereby saving energy consumption during the operation of the air conditioner indoor unit.

[0180] Among them, when the air conditioner operates in the formaldehyde removal mode, the other modes refer to at least any one of the heating mode, the formaldehyde removal mode and the dehumidification mode.

[0181] When the formaldehyde removal mode is in operation, the human sensor detects that the user returns home again, and the indoor state changes from unmanned to occupied. When the user adjusts the air conditioner to other operation modes, that is, when the formaldehyde removal mode is in operation, the controller receives an instruction to operate other modes. The compressor frequency is controlled to decrease, the controller controls the heat exchange fan to operate at a first power lower than the upper limit of the rated power of the heat exchange fan, controls the fresh air fan to operate at a second power lower than the upper limit of the rated power of the fresh air fan, and controls the indoor heat exchanger to work as an evaporator to dehumidify the indoor heat exchanger.

[0182] The compressor frequency is controlled to decrease to reduce the heat exchange capacity of the indoor heat exchanger. The controller controls the heat exchange fan to operate at a first power lower than the upper limit of the rated power of the heat exchange fan to save energy consumption of the air conditioner indoor unit.

[0183] The fresh air fan is controlled to operate at a second power which is lower than the upper limit of the rated power of the fresh air fan. The fresh air fan is switched to operate at a medium speed at the second power to prevent the rapid introduction of a large amount of outdoor air from bringing a large impact on the heat load of the indoor space and causing discomfort to the human body.

[0184] At the same time, the controller controls the dehumidification mode and controls the indoor heat exchanger to work as an evaporator, so that the indoor heat exchanger dehumidifies, thereby adjusting the indoor humidity to the humidity value corresponding to the user-set temperature. The controller integrates the optimal comfort humidity value corresponding to different preset temperatures.

[0185] When the indoor formaldehyde concentration drops below the second preset concentration, the fresh air fan is controlled to stop running, the fresh air fan is turned off, and the dehumidification mode is controlled to stop. At this time, the indoor formaldehyde concentration is reduced to a safe value and will not cause harm to the user. Turning off the fresh air fan can save energy consumption of the air conditioner indoor unit.

[0186] The controller controls the indoor heat exchanger working mode to switch to the windless mode. In the windless mode, the working state of the indoor heat exchanger remains unchanged, and the heat exchange fan is switched to operate at a first power lower than the upper limit of the rated power of the heat exchange fan, so that the heat exchange fan runs at a low speed, and the inner air guide plate and the outer air guide plate are switched to the maximum wind blocking position to avoid direct blowing on the user, thereby avoiding discomfort to the user.

[0187] It can be set that when the indoor formaldehyde concentration is not lower than the second preset concentration, the command from the user will be blocked and will not take any effect. The controller will not respond to the user's command until the indoor formaldehyde concentration is lower than the second preset concentration. It should be noted that when the indoor formaldehyde concentration is not lower than the second preset concentration, if the user performs an interfering operation, there will be a corresponding reminder, including a voice reminder or a software prompt of the smart interconnection. The user needs to wait until the indoor formaldehyde concentration is lower than the second preset concentration before the user can perform the operation.

[0188] In some embodiments, when the indoor unit of the air conditioner is provided with a formaldehyde removal module, if the human sensor detects that there is no one in the room, and the indoor heat exchanger works as a condenser to perform a formaldehyde removal cycle, if the controller receives an instruction to run other modes, the formaldehyde removal module is controlled to be turned off so that the formaldehyde removal module does not come into contact with the indoor air, thereby increasing the service life of the formaldehyde removal module. The operating power of the heat exchange fan is controlled to be reduced so that the heat exchange fan runs at a low speed. The operating frequency of the compressor is controlled to be reduced, thereby reducing the heating capacity of the indoor heat exchanger.

[0189] The operating power of the fresh air fan is controlled to be increased so that the fresh air fan keeps running at a high speed, thereby discharging the residual formaldehyde content in the room to the outside. The indoor heat exchanger is controlled to work as an evaporator so that the indoor heat exchanger performs dehumidification and reduces the indoor humidity.

[0190] When it is detected that the indoor formaldehyde concentration drops below a second preset concentration, the compressor, the heat exchange fan and the fresh air fan are controlled to stop running.

[0191] At this time, the indoor formaldehyde concentration has dropped to a safe range, and the indoor formaldehyde will not cause harm to the human body. Stopping the fresh air fan can reduce energy consumption. In the process of exhausting indoor formaldehyde to the outside through the fresh air fan, running the dehumidification mode gradually reduces the indoor humidity. Controlling the compressor to stop running to stop the dehumidification mode can reduce energy consumption.

[0192] As the indoor air is discharged to the outside through the fresh air fan, the indoor temperature can be lowered to a level suitable for users. When the indoor formaldehyde concentration has dropped to a safe range, the indoor temperature will gradually drop to a level suitable for users. Stopping the compressor and heat exchange fan can reduce energy consumption.

[0193] When the formaldehyde removal mode is running, the human sensor detects that the user returns home again, and the indoor state changes from unmanned to occupied. When the user does not adjust the air conditioner to other operating modes, that is, when the formaldehyde removal mode is running, the controller does not receive instructions to run other modes, the controller controls the formaldehyde concentration sensor to detect the indoor formaldehyde concentration. If the indoor formaldehyde concentration is not lower than the second preset concentration at this time, the controller controls to turn on the formaldehyde removal module so that the indoor air contacts the formaldehyde removal module to purify the formaldehyde in the indoor air. The controller controls to reduce the operating frequency of the compressor, controls the humidifier to stop running, controls the heat exchange fan to run at the upper limit of the rated power range of the heat exchange fan, and controls the fresh air fan to run at the upper limit of the rated power range of the fresh air fan.

[0194] The controller controls to reduce the operating frequency of the compressor so that the compressor runs at the second power of the compressor. The second power of the compressor can be set to 80% of the upper limit of the rated power of the compressor. The humidifier is controlled to stop running. Because in the formaldehyde removal mode, the indoor temperature and humidity are increased to promote the rapid release of formaldehyde. The temperature and humidity corresponding to the fastest formaldehyde release efficiency are not the best temperature and humidity state for human comfort. Therefore, the heat exchange needs to be appropriately reduced to lower the indoor temperature. Turning off the humidifier is to quickly reduce the indoor humidity to prevent the high temperature and high humidity environment indoors from causing discomfort to the human body.

[0195] The controller controls the heat exchange fan to operate at the upper limit of the rated power range of the heat exchange fan, and controls the fresh air fan to operate at the upper limit of the rated power range of the fresh air fan, so that the speeds of the heat exchange fan and the fresh air fan both maintain the maximum speeds unchanged, and the inner air guide plate and the outer air guide plate are switched to the wind-avoiding position, so that the indoor formaldehyde concentration is reduced to below the second preset concentration as soon as possible, thereby preventing the indoor formaldehyde from causing harm to indoor users.

[0196] When the indoor formaldehyde concentration is lower than the second preset concentration, the operating power of the heat exchange fan and the fresh air fan is controlled to be reduced, thereby saving energy consumption during the operation of the air conditioner indoor unit.

[0197] Among them, when the air conditioner operates in the formaldehyde removal mode, the other modes refer to at least any one of the heating mode, the formaldehyde removal mode and the dehumidification mode.

[0198] When the formaldehyde removal mode is in operation, the human sensor detects that the user returns home again, and the indoor state changes from unmanned to occupied. When the user adjusts the air conditioner to other operation modes, that is, when the formaldehyde removal mode is in operation, the controller receives an instruction to operate other modes. The compressor frequency is controlled to decrease, the controller controls the heat exchange fan to operate at a first power lower than the upper limit of the rated power of the heat exchange fan, controls the fresh air fan to operate at a second power lower than the upper limit of the rated power of the fresh air fan, and controls the indoor heat exchanger to work as an evaporator to dehumidify the indoor heat exchanger.

[0199] The compressor frequency is controlled to decrease to reduce the heat exchange capacity of the indoor heat exchanger. The controller controls the heat exchange fan to operate at a first power lower than the upper limit of the rated power of the heat exchange fan, thereby saving energy consumption of the air conditioner indoor unit.

[0200] The fresh air fan is controlled to operate at a second power which is lower than the upper limit of the rated power of the fresh air fan. The fresh air fan is switched to operate at a medium speed at the second power to prevent the rapid introduction of a large amount of outdoor air from bringing a large impact on the heat load of the indoor space and causing discomfort to the human body.

[0201] At the same time, the controller controls the dehumidification mode and controls the indoor heat exchanger to work as an evaporator, so that the indoor heat exchanger dehumidifies, thereby adjusting the indoor humidity to the humidity value corresponding to the user-set temperature. The controller integrates the optimal comfort humidity value corresponding to different preset temperatures.

[0202] When the indoor formaldehyde concentration drops below the second preset concentration, the fresh air fan is controlled to stop running, the fresh air fan is turned off, and the dehumidification mode is controlled to stop. At this time, the indoor formaldehyde concentration is reduced to a safe value and will not cause harm to the user. Turning off the fresh air fan can save energy consumption of the air conditioner indoor unit.

[0203] The controller controls the indoor heat exchanger working mode to switch to the windless mode. In the windless mode, the working state of the indoor heat exchanger remains unchanged, and the heat exchange fan is switched to operate at a first power lower than the upper limit of the rated power of the heat exchange fan, so that the heat exchange fan runs at a low speed, and the inner air guide plate and the outer air guide plate are switched to the maximum wind blocking position to avoid direct blowing on the user, thereby avoiding discomfort to the user.

[0204] It can be set that when the indoor formaldehyde concentration is not lower than the second preset concentration, the command from the user will be blocked and will not take any effect. The controller will not respond to the user's command until the indoor formaldehyde concentration is lower than the second preset concentration. It should be noted that when the indoor formaldehyde concentration is not lower than the second preset concentration, if the user performs an interfering operation, there will be a corresponding reminder, including a voice reminder or a software prompt of the smart interconnection. The user needs to wait until the indoor formaldehyde concentration is lower than the second preset concentration before the user can perform the operation.

[0205] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An air conditioner, characterized in that: It includes: Air conditioner indoor unit and air conditioner outdoor unit; The air conditioner indoor unit comprises: A shell body having a heat exchange outlet; An indoor heat exchanger is arranged inside the shell, and the refrigerant flowing inside the indoor heat exchanger exchanges heat with the indoor air to form a heating cycle or a cooling cycle, and the indoor air flows to the outside of the shell through the heat exchange outlet after the heat exchange; A heat exchange fan, used to drive the indoor air to be transported to the indoor through the heat exchange air outlet; A humidifier, which is disposed in the housing, and is used to generate steam, and the steam flows to the outside of the housing through the heat exchange air outlet; Human sensor, used to detect whether there is someone in the room; Indoor temperature sensor, used to detect indoor temperature; Indoor humidity sensor, used to detect indoor humidity; Formaldehyde concentration sensor, used to detect indoor formaldehyde concentration; The air conditioner outdoor unit at least comprises a compressor, and the compressor is connected to the indoor heat exchanger via a refrigerant circuit; The controller is configured such that: the indoor heat exchanger works as a condenser, and detects through a human sensor that the indoor state changes from an unmanned state to a manned state; When the controller does not receive an instruction to run other modes and the indoor formaldehyde concentration is not lower than a second preset concentration, the controller controls to reduce the operating frequency of the compressor, controls the humidifier to stop running, controls the heat exchange fan to run at an upper limit of the rated power range of the heat exchange fan, and controls the fresh air fan to run at an upper limit of the rated power range of the fresh air fan; When the indoor formaldehyde concentration is lower than a second preset concentration, the operating powers of the heat exchange fan and the fresh air fan are controlled to be reduced.

2. The air conditioner according to claim 1, characterized in that: The controller is configured as: When the indoor heat exchanger works 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 controlled to increase.

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

4. The air conditioner according to claim 1, characterized in that: The controller is configured to: When the indoor heat exchanger works 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 controlled to remain unchanged and the humidifier is controlled to be turned on.

5. The air conditioner according to claim 1, characterized in that: The controller is configured to: When the indoor heat exchanger works 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 a first preset temperature and the indoor humidity is not lower than a first preset humidity, the operating frequency of the compressor is controlled to remain unchanged, the operating state of the humidifier is controlled to remain unchanged, and the heat exchange fan is controlled to operate at the upper limit of the rated power range of the heat exchange fan.

6. The air conditioner according to claim 1, characterized in that: Also includes: Fresh air fan, used to transport outdoor fresh air to indoor areas; The controller is configured to: When the indoor heat exchanger works as a condenser and detects that the indoor temperature is not lower than a first preset temperature and the indoor humidity is not lower than a first preset humidity, controlling to turn on the formaldehyde concentration sensor; When the formaldehyde concentration sensor detects that the growth value of the indoor formaldehyde concentration within a preset time period is less than a first preset range, the fresh air fan is controlled to operate at an upper limit value of the rated power range of the fresh air fan.

7. The air conditioner according to claim 1, characterized in that: Also includes: Fresh air fan, used to transport outdoor fresh air to indoor areas; The controller is configured to: When the human sensing sensor detects that there is no one in the room and the indoor heat exchanger works as a condenser, the operating power of the heat exchange fan is controlled to be reduced, the operating power of the fresh air fan is controlled to be increased, 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 a second preset concentration, the compressor, the heat exchange fan and the fresh air fan are controlled to stop running.

8. The air conditioner according to claim 1, characterized in that: The controller is configured to: When the indoor heat exchanger works as a condenser and a person is detected in the room by the human sensing sensor, the heat exchange fan is controlled to operate at a first power lower than the upper limit of the rated power of the heat exchange fan, the fresh air fan is controlled to operate at a second power lower than the upper limit of the rated power of the fresh air fan, and the indoor heat exchanger is controlled to work as an evaporator to dehumidify the indoor heat exchanger.

9. The air conditioner according to claim 8, characterized in that: The controller is configured to control the fresh air fan to stop running when the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is lower than a second preset concentration.

10. An air conditioner, characterized in that: It includes: Air conditioner indoor unit and air conditioner outdoor unit; The air conditioner indoor unit comprises: A shell body having a heat exchange outlet; An indoor heat exchanger is arranged inside the shell, and the refrigerant flowing inside the indoor heat exchanger exchanges heat with the indoor air to form a heating cycle or a cooling cycle, and the indoor air flows to the outside of the shell through the heat exchange outlet after the heat exchange; A heat exchange fan, used to drive the indoor air to be transported to the indoor through the heat exchange air outlet; A humidifier, which is disposed in the housing, and is used to generate steam, and the steam flows to the outside of the housing through the heat exchange air outlet; A formaldehyde removal module, used to remove formaldehyde in the air flowing through the formaldehyde removal module; Human sensor, used to detect whether there is someone in the room; Indoor temperature sensor, used to detect indoor temperature; Indoor humidity sensor, used to detect indoor humidity; Formaldehyde concentration sensor, used to detect indoor formaldehyde concentration; The air conditioner outdoor unit at least comprises a compressor, and the compressor is connected to the indoor heat exchanger via a refrigerant circuit; The controller is configured as: The indoor heat exchanger works as a condenser, and the human sensor detects that the indoor state changes from an unmanned state to a manned state; When the controller does not receive an instruction to run other modes and the indoor formaldehyde concentration is not lower than a second preset concentration, the formaldehyde removal module is controlled to be turned on, the operating frequency of the compressor is controlled to be reduced, the humidifier is controlled to stop running, the heat exchange fan is controlled to run at an upper limit of the rated power range of the heat exchange fan, and the fresh air fan is controlled to run at an upper limit of the rated power range of the fresh air fan; When the indoor formaldehyde concentration is lower than a second preset concentration, the operating powers of the heat exchange fan and the fresh air fan are controlled to be reduced.

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