Air conditioner

Abstract

The present 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 housing; an indoor heat exchanger, which is arranged in the housing, a refrigerant flowing therein exchanging heat with indoor air to form a heating cycle or a cooling cycle, and after the heat exchange, the indoor air flowing to the outside of the housing through a heat exchange air outlet; a humidifier; an indoor temperature sensor; and an indoor humidity sensor. The air conditioner outdoor unit at least comprises a compressor, the compressor being communicated with the indoor heat exchanger by means of a refrigerant loop. A controller is configured to : when the indoor heat exchanger works as a condenser, control the indoor temperature sensor to measure the indoor temperature and control the indoor humidity sensor to measure the indoor humidity, and 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 operation frequency of the compressor to be increased and control the humidifier to be started, thereby improving formaldehyde release and formaldehyde removal effects.

Description

air conditioner

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent applications filed on June 30, 2023, with application number 202310801011.9; filed on June 30, 2023, with application number 202310799820.0; filed on July 28, 2023, with application number 202310946769.1; and filed on July 28, 2023, with application number 202310946781.2, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of air-conditioning equipment, and in particular to air conditioners. Background Art

[0004] An air conditioner, or air conditioner, is a device that manually adjusts and controls the temperature, humidity, flow rate, and other parameters of the ambient air within a building or structure. Air conditioners typically consist of indoor and outdoor units, and some have formaldehyde removal capabilities.

[0005] In the related art, air conditioners with formaldehyde removal function mostly remove formaldehyde gas from the indoor air by passing indoor air through adsorption modules such as formaldehyde removal filters contained in the indoor unit of the air conditioner. However, the current method of removing formaldehyde through the indoor unit of the air conditioner is single, and it cannot be distinguished according to actual usage scenarios. The efficiency of formaldehyde removal is low and the energy consumption is high. In addition, the adsorption modules such as formaldehyde removal filters need to be replaced frequently. Moreover, the formaldehyde is adsorbed inside the indoor unit of the air conditioner and still exists indoors, and will continue to cause harm to the human body.

[0006] Summary of the Invention

[0007] According to some embodiments of the present application, an air conditioner includes: an air conditioner indoor unit and an air conditioner outdoor unit; the air conditioner indoor unit includes: a shell, which is provided with a heat exchange outlet; an indoor heat exchanger, which is arranged inside the shell, and the refrigerant flowing inside the shell 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 humidifier, which is arranged in the shell, and the humidifier is configured to: generate steam, and the steam flows to the outside of the shell through the heat exchange outlet; an indoor temperature sensor, which is configured to: detect the indoor temperature; the indoor humidity sensor, which is configured to: detect the indoor humidity; the air conditioner outdoor unit includes at least a compressor, and the compressor is connected to the indoor heat exchanger through a refrigerant circuit; the 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 the first preset humidity, control the compressor to increase the operating frequency and control the humidifier to start.

[0008] According to some embodiments of the present application, an air conditioner includes: an air conditioner indoor unit and an air conditioner outdoor unit; the air conditioner indoor unit includes: a shell, which is provided with a heat exchange outlet; an indoor heat exchanger, which is arranged inside the shell, and the refrigerant flowing inside the shell performs heat exchange 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, which is configured to: drive the indoor air to be transported to the room through the heat exchange outlet; a humidifier, which is arranged in the shell, and is configured to: generate steam, and the steam flows to the outside of the shell through the heat exchange outlet; a human body sensing sensor, which is configured to: detect whether there is someone in the room; an indoor temperature sensor, which is configured to: detect the indoor temperature; an indoor humidity sensor, which is configured to: The controller is configured to: detect indoor humidity; the formaldehyde concentration sensor is configured to: detect indoor formaldehyde concentration; the controller is configured to: when the indoor heat exchanger works as a condenser, the human body sensing sensor detects that there is someone in the room, and the indoor formaldehyde concentration is not lower than a second preset concentration, control the reduction of the operating frequency of the compressor, control the humidifier to stop running, 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; when the indoor formaldehyde concentration is lower than the second preset concentration, control the reduction of the operating power of the heat exchange fan and the fresh air fan; the air-conditioning outdoor unit at least includes a compressor, and the compressor is connected to the indoor heat exchanger through a refrigerant circuit.

[0009] According to some embodiments of the present application, an air conditioner includes: an air conditioner indoor unit, the air conditioner indoor unit including: a shell having a heat exchange outlet; an indoor heat exchanger arranged inside the shell, wherein the refrigerant flowing inside the shell performs heat exchange 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; an indoor temperature sensor configured to detect the indoor temperature; an indoor humidity sensor configured to detect the indoor humidity; a formaldehyde concentration sensor configured to detect the indoor formaldehyde concentration; and a controller configured to control the indoor temperature sensor to detect the indoor temperature and the indoor humidity sensor to detect the indoor formaldehyde concentration when the indoor heat exchanger works as a condenser. indoor humidity; when the indoor temperature is not lower than a first preset temperature and the indoor humidity is not lower than the first preset humidity, the formaldehyde concentration sensor is controlled to be turned on; when the formaldehyde concentration sensor detects that the growth value of the 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; when the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is lower than the first decrease amplitude of the first preset concentration, the fresh air fan is controlled to operate at a fourth power lower than the upper limit of the rated power range of the fresh air fan.

[0010] hood, and the like. The heat dissipation fan of the indoor air conditioner is connected to the heat dissipation fan of the indoor air conditioner by the heat dissipation device, and the heat dissipation device of the indoor air conditioner is connected to the heat dissipation device of the indoor air conditioner by the heat dissipation device. The heat dissipation device of the indoor air conditioner is connected to the heat dissipation device of the indoor air conditioner by the heat dissipation device. The internal humidity sensor is configured to detect indoor humidity; the formaldehyde concentration sensor is configured to detect indoor formaldehyde concentration; the controller is configured to: when the indoor heat exchanger works as a condenser, the human body sensing sensor detects that there is someone in the room, and the indoor formaldehyde concentration is not lower than a second preset concentration, control the formaldehyde removal module to be turned on, control the reduction of the operating frequency of the compressor, control the humidifier to stop running, 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; when the indoor formaldehyde concentration is lower than the second preset concentration, control the reduction of the operating power of the heat exchange fan and the fresh air fan; the air-conditioning outdoor unit at least includes a compressor, and the compressor is connected to the indoor heat exchanger through a refrigerant circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a schematic diagram of the overall structure of an air conditioner according to some embodiments of the present application;

[0012] FIG2 is a first schematic diagram of the overall structure of a wall-mounted air conditioner indoor unit according to some embodiments of the present application;

[0013] FIG3 is a second schematic diagram of the overall structure of a wall-mounted air conditioner indoor unit according to some embodiments of the present application;

[0014] FIG4 is a flowchart of a work flow when an air conditioner indoor unit detects the presence or absence of a person according to some embodiments of the present application;

[0015] FIG5 is a specific workflow diagram of an air conditioner indoor unit when detecting that there is someone indoors according to some embodiments of the present application;

[0016] FIG6 is a first flowchart of a formaldehyde removal cycle of an air-conditioning indoor unit in a heating mode according to some embodiments of the present application;

[0017] FIG7 is a second flowchart of a formaldehyde removal cycle of an air-conditioning indoor unit in a heating mode according to some embodiments of the present application;

[0018] FIG8 is a third flowchart of a formaldehyde removal cycle of an air-conditioning indoor unit in a heating mode according to one embodiment of the present application;

[0019] FIG9 is a fourth flowchart of a formaldehyde removal cycle of an air-conditioning indoor unit in a heating mode according to some embodiments of the present application;

[0020] FIG10 is a fifth flowchart of an air conditioner indoor unit operating in a heating mode according to some embodiments of the present application;

[0021] FIG11 is a sixth flowchart of an air conditioner indoor unit operating in a heating mode according to some embodiments of the present application;

[0022] FIG12 is a flowchart of the working process of the air conditioner indoor unit when formaldehyde reaches an equilibrium state according to some embodiments of the present application;

[0023] FIG13 is a first flowchart of an air conditioner indoor unit operating in cooling mode according to some embodiments of the present application;

[0024] FIG14 is a second flowchart of an air conditioner indoor unit in a cooling mode according to some embodiments of the present application;

[0025] FIG15 is a third flowchart of the air conditioner indoor unit in cooling mode according to some embodiments of the present application;

[0026] FIG16 is a fourth flowchart of the air conditioner indoor unit in cooling mode according to some embodiments of the present application;

[0027] FIG17 is a fifth flowchart of an air conditioner indoor unit in a cooling mode according to some embodiments of the present application;

[0028] FIG18 is a sixth flowchart of an air conditioner indoor unit operating in cooling mode according to some embodiments of the present application;

[0029] FIG19 is a flowchart of a work flow when an air conditioner indoor unit detects that no one is indoors according to some embodiments of the present application;

[0030] FIG20 is a second flowchart of the air conditioner indoor unit in cooling mode according to some embodiments of the present application;

[0031] FIG21 is a fifth flowchart of an air conditioner indoor unit in a cooling mode according to some embodiments of the present application;

[0032] FIG22 is a sixth flowchart of the air conditioner indoor unit in cooling mode according to some embodiments of the present application;

[0033] FIG23 is a flowchart of the operation of the formaldehyde removal cycle of the air conditioner indoor unit according to some embodiments of the present application;

[0034] FIG24 is a fifth flowchart of an air conditioner indoor unit in operation of a formaldehyde removal cycle according to some embodiments of the present application;

[0035] FIG25 is a flowchart of an unoccupied air conditioner according to some embodiments of the present application;

[0036] FIG26 is a second flowchart of an unoccupied air conditioner according to some embodiments of the present application;

[0037] FIG27 is a third flowchart of an unoccupied air conditioner according to some embodiments of the present application;

[0038] FIG28 is a flowchart of a workflow of an air conditioner when someone is occupied according to some embodiments of the present application;

[0039] FIG29 is a flowchart of the first logic and the second logic of the air conditioner according to some embodiments of the present application;

[0040] FIG30 is a flowchart of a third logic operation of an air conditioner according to some embodiments of the present application;

[0041] FIG31 is a flowchart of a first logic flow of an air conditioner equipped with a formaldehyde removal module according to some embodiments of the present application;

[0042] FIG32 is a flowchart of a second logic of an air conditioner equipped with a formaldehyde removal module according to some embodiments of the present application;

[0043] FIG33 is a flowchart of a third logic flow of an air conditioner equipped with a formaldehyde removal module according to some embodiments of the present application;

[0044] FIG34 is a flowchart of a first embodiment of an air conditioner entering different modes according to a current scenario according to some embodiments of the present application;

[0045] FIG35 is a flowchart 1 of the air conditioner entering the first mode according to some embodiments of the present application;

[0046] FIG36 is a second flowchart of the air conditioner entering the first mode according to some embodiments of the present application;

[0047] FIG37 is a third flowchart of the air conditioner entering the first mode according to some embodiments of the present application;

[0048] FIG38 is a flowchart of a first step of an air conditioner entering a second mode according to some embodiments of the present application;

[0049] FIG39 is a second flowchart of the air conditioner entering the second mode according to some embodiments of the present application;

[0050] FIG40 is a third flowchart of the air conditioner entering the second mode according to some embodiments of the present application;

[0051] FIG41 is a fourth flowchart of the air conditioner entering the second mode according to some embodiments of the present application;

[0052] FIG42 is a flowchart of a process of entering a third mode of an air conditioner according to some embodiments of the present application;

[0053] In the above figures: housing 100; air conditioner outdoor unit 200. DETAILED DESCRIPTION

[0054] In the description of the present application, it should 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" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present application.

[0055] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; connections, or indirect connections through an intermediate medium; internal communication between two elements, or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0056] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0057] In this application, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" 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 application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0058] The present application is described in detail below by way of exemplary embodiments, but it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0059] In this application, when the air conditioner operates in cooling mode (cooling mode indicates turning on the cooling function of the air conditioner to lower the indoor temperature), 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.

[0060] The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air. The refrigerant absorbs heat to provide cooling to the indoor space, thereby achieving temperature regulation of the indoor space.

[0061] The compressor compresses the low-temperature, low-pressure refrigerant gas and discharges it into a high-temperature, high-pressure refrigerant gas, which then flows into the outdoor heat exchanger. The outdoor heat exchanger condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0062] 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.

[0063] The indoor heat exchanger evaporates the refrigerant expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The indoor heat exchanger achieves a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the indoor air.

[0064] Throughout the refrigeration cycle, the air conditioner indoor unit regulates the temperature of the indoor space.

[0065] When the air conditioner operates in heating mode (heating mode means turning on the cooling function of the air conditioner to increase the indoor temperature), 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.

[0066] The heating cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air. The refrigerant releases heat to provide heat to the indoor space, thereby achieving temperature regulation of the indoor space.

[0067] During the heating cycle, the compressor compresses low-temperature, low-pressure refrigerant gas and discharges it as high-temperature, high-pressure refrigerant gas. This refrigerant gas flows into the indoor heat exchanger. The indoor heat exchanger condenses the compressed refrigerant into a liquid phase. The heat generated by the condensation is exchanged with the indoor air flowing through the indoor heat exchanger, thereby raising the indoor temperature.

[0068] 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.

[0069] 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 can exchange heat with the outdoor air by utilizing the latent heat of evaporation of the refrigerant.

[0070] Throughout the heating cycle, the air conditioner indoor unit regulates the temperature of the indoor space.

[0071] The outdoor unit of the air conditioner includes at least a compressor and an outdoor heat exchanger, and is also called the outdoor unit of the air conditioner indoor unit, that is, the outdoor unit of the air conditioner indoor unit refers to the part of the compressor and the outdoor heat exchanger included in the refrigeration cycle, and the indoor unit of the air conditioner includes at least an indoor heat exchanger, and is also called the indoor unit of the air conditioner indoor unit, that is, the indoor unit of the air conditioner indoor unit includes at least an indoor heat exchanger, and the expansion valve can be provided in the air conditioner indoor unit or the air conditioner outdoor unit.

[0072] 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 heating mode, and when the indoor heat exchanger functions as an indoor heat exchanger, the air conditioner indoor unit functions as a cooler in cooling mode.

[0073] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0074] As shown in Figures 1 to 15 , in some embodiments of the air conditioner of the present application, the air conditioner includes an air conditioner indoor unit;

[0075] In some embodiments, the air conditioner includes an air conditioner outdoor unit 200;

[0076] In some embodiments, the air conditioner outdoor unit 200 includes a compressor;

[0077] In some embodiments, the air conditioner outdoor unit includes an outdoor heat exchanger;

[0078] In some embodiments, the air conditioner indoor unit includes an indoor heat exchanger;

[0079] In some embodiments, a refrigerant flows between the outdoor heat exchanger and the indoor heat exchanger to complete the heat exchange.

[0080] In some embodiments, the expansion valve may be provided in the air conditioner indoor unit or the air conditioner outdoor unit 200 .

[0081] In some embodiments, the air conditioner includes an indoor heat exchanger, an outdoor heat exchanger, a compressor, an expansion valve, and a pipe for circulating refrigerant, and the indoor heat exchanger and the outdoor heat exchanger are both connected to the compressor.

[0082] In some embodiments, the expansion valve is an electronic expansion valve.

[0083] In some embodiments, the electronic expansion valve is connected between the indoor heat exchanger and the outdoor heat exchanger, and is capable of expanding the liquid refrigerant that has undergone the condensation process into a low-pressure liquid refrigerant.

[0084] In some embodiments, the compressor includes an air intake and an air exhaust. The refrigerant that absorbs heat and undergoes an evaporation process enters the compressor from the air intake. The compressor compresses the gaseous refrigerant into a high-temperature and high-pressure state and then discharges it from the exhaust.

[0085] In some embodiments, the indoor heat exchanger and the outdoor heat exchanger are respectively connected through a four-way valve and a compressor in the refrigerant circuit.

[0086] In some embodiments, the four-way valve includes a first valve port, a second valve port, a third valve port, and a fourth valve port, wherein the air intake 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.

[0087] In some embodiments, in the refrigerant circuit, the refrigerant may circulate sequentially through a compressor, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger.

[0088] In some embodiments, 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.

[0089] In some embodiments, 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.

[0090] 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 body sensing sensor.

[0091] The housing 100 forms the overall appearance of the air conditioner indoor unit. In some embodiments, the indoor heat exchanger, the heat exchange fan and the fresh air fan are arranged inside the housing 100 .

[0092] In some embodiments, the housing 100 is provided with some or all of the following air vents: an indoor air inlet, an outdoor air inlet, a heat exchange outlet, and a fresh air outlet.

[0093] In some embodiments, an indoor heat exchanger is provided inside the shell 100, and heat exchange is performed between the refrigerant flowing inside and 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 shell 100 through the heat exchange outlet.

[0094] In some embodiments, the heat exchange fan can be a cross-flow fan. When the heat exchange fan is started, the indoor air is introduced into the interior of the shell 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 interior of the shell 100 to the heat exchange outlet.

[0095] In some embodiments, the heat exchange blower includes a heat exchange fan and a heat exchange drive motor, and the heat exchange drive motor drives the heat exchange fan to rotate.

[0096] In some embodiments, 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.

[0097] In some embodiments, a humidifier is disposed in the housing 100 and is configured to generate steam. The steam can flow to the outside of the housing 100 through the heat exchange outlet driven by the heat exchange fan, thereby increasing the indoor humidity and accelerating the volatilization of formaldehyde.

[0098] In some embodiments, the fresh air module is arranged in the space inside the shell 100 of the air-conditioning indoor unit. The fresh air module includes a fresh air casing, which is provided with a fresh air inlet and a fresh air outlet. The fresh air inlet is connected to the outdoor air inlet on the shell 100, and a fresh air cavity connecting the fresh air inlet and the fresh air outlet is formed in the fresh air module.

[0099] In some embodiments, the fresh air inlet can be set at the top, front, rear, left or right side of the fresh air casing, and correspondingly, the outdoor air inlet can be set at the top, front, rear, left or right side of the shell 100 corresponding to the fresh air inlet.

[0100] In some embodiments, the fresh air outlet can be arranged on the four sides of the air-conditioning air outlet of the shell 100, so that the fresh air flowing out from the fresh air outlet is mixed with the air-conditioning air flowing out from the heat exchange outlet, so as to reduce the impact 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.

[0101] In some embodiments, 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.

[0102] In some embodiments, the fresh air module includes a fresh air blower disposed in the fresh air cavity.

[0103] In some embodiments, 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 (fresh air outlet). The fresh air fan provides power for the fresh air to flow from the fresh air inlet to the fresh air outlet.

[0104] In some embodiments, the fresh air blower includes a fan and a drive motor, and the drive motor drives the fan to rotate.

[0105] In some embodiments, the fresh air module further includes a fresh air duct connecting indoor and outdoor;

[0106] In some embodiments, the fresh air duct is correspondingly arranged through the outdoor air inlet.

[0107] In some embodiments, the fresh air duct is installed through a duct installation hole in the wall. One end of the fresh air duct faces the room and is connected to the fresh air inlet of the fresh air module. The other end of the fresh air duct faces the outside and is provided with an air inlet. The fresh air duct is connected to the outside through the air inlet. Based on this installation method, under the action of the fresh air fan, outdoor fresh air can flow from the outside along the fresh air duct into the indoor fresh air module and be blown into the room through the fresh air outlet, thus introducing outdoor fresh air into the room.

[0108] In some embodiments, the indoor temperature sensor is disposed at an indoor air inlet, and the indoor temperature sensor is configured to detect the indoor temperature.

[0109] In some embodiments, the indoor humidity sensor is disposed at an indoor air inlet, and the indoor humidity sensor is configured to detect indoor humidity.

[0110] In some embodiments, it can be configured that the indoor temperature sensor and the indoor humidity sensor can be an integrated temperature and humidity sensor to detect the indoor temperature and the indoor humidity.

[0111] In some embodiments, the formaldehyde concentration sensor is disposed at the heat exchange air outlet, and the formaldehyde concentration sensor is configured to detect indoor formaldehyde concentration.

[0112] In some embodiments, the human body sensing sensor is disposed on the housing 100 and is configured to detect whether there is a person in the room.

[0113] In some embodiments, the human body sensing sensor may use an infrared human body sensing sensor to detect whether there is a person in the room.

[0114] In some embodiments, the indoor heat exchanger further includes an inner air guide plate and an outer air guide plate;

[0115] In some embodiments, the inner air guide plate is provided at the heat exchange outlet and is located inside the housing 100;

[0116] In some embodiments, an outer air deflector is provided at the heat exchange outlet of the air conditioner indoor unit, which is in communication with the indoor air inlet. Driven by the heat exchange blower, 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 outlet.

[0117] In some embodiments, when the air conditioner indoor unit is a cabinet-type air conditioner indoor unit, the inner air guide plate can swing back and forth up and down to sweep the indoor air in an upward and downward swing manner. The outer air guide plate can rotate left and right to sweep the indoor air in an upward and downward swing manner.

[0118] In some embodiments, when the air conditioner indoor unit is a wall-mounted air conditioner indoor unit, the inner air guide plate can swing back and forth to sweep the indoor air left and right, and the outer air guide plate can rotate up and down to sweep the indoor air.

[0119] Referring to Figures 4 to 19, in some embodiments, when the controller receives a command (S401) to turn on the formaldehyde removal mode (indicating that the formaldehyde removal function of the air conditioner is turned on to release the formaldehyde in the furniture and home decoration in the space where the air conditioner indoor unit is located into the air, and the indoor air containing formaldehyde is discharged to the outside), it is configured as follows: the human body sensing sensor is turned on (S402) to detect whether there is someone in the room.

[0120] In some embodiments, when a human presence sensor detects a person in the room, and the indoor heat exchanger of the air conditioner is in operation, the controller maintains the operating states of the indoor heat exchanger and humidifier. In this case, the formaldehyde removal program's control of the air conditioner's temperature and humidity is suppressed, and the controller prioritizes the user's currently set temperature and humidity.

[0121] In some embodiments, 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, thereby avoiding the discomfort caused to the user by the change of indoor temperature and humidity control when the dehumidification program is running.

[0122] In some embodiments, when the controller receives a 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.

[0123] In some embodiments, if the inner air guide plate and the outer air guide plate are in a windless state, and if the inner air guide plate and the outer air guide plate are in an anti-direct blowing state, the controller controls the speed of the heat exchange fan to maintain the speed currently set by the user, thereby avoiding the high speed of the heat exchange fan and causing discomfort to the user.

[0124] In some embodiments, when the compressor stops running, the user turns on the formaldehyde removal mode. At this time, the controller receives a 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.

[0125] It can be set that, in some embodiments, a reminder sticker can be set on the control panel of the shell 100, or when the user turns on the formaldehyde removal function separately on the control software corresponding to the air-conditioning indoor unit, a corresponding prompt message will pop up on the control software.

[0126] In some embodiments, the prompt message can be set to "Please turn on the air conditioner first", so as to remind the user that when correctly running the formaldehyde removal mode, they need to turn on the air conditioner first.

[0127] In some embodiments, when the human body sensing sensor detects that there is someone in the room (S403), the air conditioner indoor unit is controlled to issue a prompt (S404) to remind the user to leave the room within a preset time.

[0128] In some embodiments, after the reminder is issued for a preset time, the human body sensing sensor is controlled to detect again whether there is anyone in the room (S405).

[0129] The air conditioner indoor unit may issue a prompt by a voice prompt or by using its control software.

[0130] In some embodiments, the preset time can be set to any value in the range of 1 to 10 minutes, such as 1 minute, 3 minutes, 5 minutes, 5.5 minutes, 7 minutes, 9 minutes, etc.

[0131] In some embodiments, when the human body sensing sensor detects that there is no one in the room ( S406 ), the controller controls the start of the formaldehyde removal cycle ( S407 ).

[0132] 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, reminding the user not to return indoors during the formaldehyde removal time, and to return after the formaldehyde removal time. The formaldehyde removal time can be set to any value in the range of 1.5 to 3 hours, such as 1.5 hours, 2 hours, 2.2 hours, 3 hours, etc. This helps prevent the user from returning indoors 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 progress of the formaldehyde removal cycle.

[0133] In some embodiments, when the human body sensing sensor detects that there is someone in the room, the controller is configured to perform some or all of the following operations: Operation one, control the fresh air fan to operate at the upper limit of the rated power of the fresh air fan; Operation two, adjust the speed of the fresh air fan to the highest speed, thereby achieving maximum fresh air volume, quickly ventilating the indoor air, and reducing the indoor formaldehyde concentration.

[0134] In some embodiments, the air conditioner indoor unit is further provided with a formaldehyde removal module, which is configured to remove formaldehyde from the indoor air.

[0135] In some embodiments, the formaldehyde removal module removes formaldehyde from indoor air in ways that include but are not limited to physical adsorption (for example, adsorption materials such as activated carbon), chemical bonding (for example, potassium permanganate chemical reaction, etc.), catalytic oxidation (for example, photocatalytic catalysis, room temperature catalytic catalysis, high temperature catalytic catalysis) and other technical means.

[0136] In some embodiments, when a formaldehyde removal module is provided in the indoor unit of the air conditioner, after the controller receives a command to turn on the formaldehyde removal mode, the human body sensing sensor is turned on to detect whether there is anyone in the room.

[0137] In some embodiments, when a human presence sensor detects a person in a room (S501), and if the indoor heat exchanger of the air conditioner indoor unit is in operation (S502), the controller performs some or all of the following operations: Operation 1: Controlling the operation of the indoor heat exchanger and humidifier to remain unchanged; Operation 2: Controlling the activation of a formaldehyde removal module to purify formaldehyde in the indoor air. As a specific embodiment, step S503 shown in FIG5 includes: Controlling the operation of the indoor heat exchanger and humidifier to remain unchanged, and controlling the activation of the formaldehyde removal module.

[0138] In some embodiments, when there are people in the room, by turning on the formaldehyde removal module to purify the indoor formaldehyde, changes in indoor temperature and humidity can be avoided, discomfort to indoor users can be avoided, and the user experience of indoor users can be improved.

[0139] In some embodiments, when the human body sensing sensor detects that there is no one in the room (S406), the controller controls the fresh air fan to start and run, and the fresh air fan runs at the upper limit of the rated power of the fresh air fan, thereby achieving maximum fresh air volume and rapid ventilation of the indoor air (S1901).

[0140] 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.

[0141] In some embodiments, in the formaldehyde removal mode, the air conditioner runs a heating cycle and controls the indoor heat exchanger to work as a condenser.

[0142] In some embodiments, the preset date can be set to a working day, where working days refer to the user's working hours from Monday to Friday.

[0143] In some embodiments, when the controller obtains that the current date is not a preset date, it means that it is a rest day, and rest days refer to Saturdays and Sundays.

[0144] In some embodiments, the air conditioner can be linked with indoor smart devices to obtain whether the current time is the preset time.

[0145] In some embodiments, the smart device may be a mobile phone, a computer, or a smart voice assistant.

[0146] In some embodiments, the linkage method can be Bluetooth or cloud transmission.

[0147] In some embodiments, when the formaldehyde removal mode is in operation, if the human presence sensor detects that no one is in the room, the controller controls the formaldehyde removal module to shut down. Because the formaldehyde removal module has a limited lifespan, when no one is in the room, the formaldehyde removal module is configured to be turned on intermittently or periodically to extend its service life, and then perform at least one formaldehyde removal cycle.

[0148] In some embodiments, when the formaldehyde removal mode is enabled, the controller controls the air conditioner to run multiple formaldehyde removal cycles, with the number of formaldehyde removal cycles being set to four. Because one formaldehyde removal cycle takes approximately two hours, and a user's default working hours are eight hours per day, the formaldehyde removal cycle is enabled four times when no one is indoors. This allows multiple formaldehyde removal cycles to be performed before the user returns indoors, thereby improving formaldehyde removal efficiency.

[0149] In some embodiments, the number of formaldehyde removal cycles can also be set by the user. For example, if there are 24 hours in a day, the lower limit is 1 time and the upper limit is 12 times. The user can set any value in the range of 1 to 12 times.

[0150] In some embodiments, a formaldehyde removal cycle includes: determining whether the indoor heat exchanger works as a condenser (S601); 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 (S602).

[0151] In some embodiments, when the indoor temperature sensor detects that the indoor temperature is lower than a first preset temperature and the indoor humidity sensor detects that the indoor humidity is not lower than a first preset humidity ( S603 ), the controller controls to increase the operating frequency of the compressor ( S604 ).

[0152] In some embodiments, 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 (S603), the controller controls to increase the operating frequency of the compressor and controls to turn on the humidifier (S606).

[0153] The controller increases the frequency of the compressor, thereby increasing the heat exchange rate of the indoor heat exchanger. As the indoor air flows through the indoor heat exchanger, it is heated and then flows into the room through the heat exchange outlet, thereby raising the indoor temperature. This high temperature and humidity in the indoor environment further promotes the release of formaldehyde from indoor furniture and home furnishings.

[0154] As indoor temperature rises, indoor humidity decreases, sometimes falling below a first preset humidity. When the indoor temperature is below the first preset temperature but the indoor humidity is not below the first preset humidity, the humidifier is activated to maintain the indoor humidity at or above the first preset humidity, thereby increasing the release of formaldehyde from indoor furniture into the air. Increasing the compressor frequency to increase the temperature further promotes formaldehyde release from indoor furniture.

[0155] In some embodiments, when the indoor temperature sensor detects that the indoor temperature is lower than a first preset temperature and the indoor humidity sensor detects that the indoor humidity is lower than a first preset humidity (S605), the controller controls to increase the operating frequency of the compressor and controls to turn on the humidifier (S606).

[0156] In this embodiment, the controller increases the heat exchange capacity 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.

[0157] When the indoor humidity falls below a first preset humidity, the humidifier is activated to raise the indoor humidity. This high humidity environment can increase the release of formaldehyde from furniture and furnishings into the air. This, combined with increasing the compressor frequency to raise the indoor temperature, can further promote the release of formaldehyde from furniture.

[0158] In some embodiments, 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 lower than the first preset humidity (S607), 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. At the same time or after a certain time, the humidifier is controlled to turn on (S608).

[0159] In this embodiment, the controller activates the humidifier to increase indoor humidity. This high humidity can increase the release of formaldehyde from furniture and furnishings into the air. This, combined with the indoor heat exchanger's heating to raise the indoor temperature, further increases the release of formaldehyde from furniture and furnishings.

[0160] In some embodiments, 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 (S609), the controller performs some or all of the following operations: Operation 1: Controlling the operating frequency of the compressor to remain unchanged; Operation 2: Maintaining the indoor heat exchanger in the current heating state to ensure that the indoor temperature is not lower than the first preset temperature and to avoid changes in the operating frequency of the compressor that result in increased energy consumption; Operation 3: Controlling the operating state of the humidifier to remain unchanged; Operation 4: Controlling the heat exchange fan to operate at the upper limit of the rated power range of the heat exchange fan. It should be noted that, as a specific embodiment, step S610 shown in FIG17 includes: controlling the operating frequency of the compressor to remain unchanged, maintaining the indoor heat exchanger in the current heating state, controlling the operating state of the humidifier to remain unchanged, and controlling the heat exchange fan to operate at the upper limit of the rated power range of the heat exchange fan.

[0161] In some embodiments, 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 (S609), the controller is configured to perform some or all of the following operations: Operation one, control the operating frequency of the compressor to remain unchanged; Operation two, the indoor heat exchanger maintains the current heating state to ensure that the indoor temperature is not lower than the first preset temperature, and avoids higher energy consumption due to changes in the operating frequency of the compressor; Operation three, control the operating state of the humidifier to remain unchanged; Operation four, control the heat exchange fan to operate at the upper limit of the rated power range of the heat exchange fan; Operation five, control the fresh air fan to operate at the upper limit of the rated power range of the fresh air fan.

[0162] In a specific embodiment shown in FIG11 , after step S609, the controller is configured to execute step S610′. Step S610′ includes controlling the operating frequency of the compressor to remain unchanged, maintaining the current heating state of the indoor heat exchanger, controlling the operating state of the humidifier to remain unchanged, controlling the heat exchange fan to operate at the upper limit of its rated power range, and controlling the fresh air fan to operate at the upper limit of its rated power range.

[0163] The controller activates the humidifier to increase indoor humidity. High humidity can increase the release of formaldehyde from furniture and furnishings into the air. This, combined with the indoor heat exchanger's heating to raise the indoor temperature, can further promote formaldehyde release from furniture. Operating the heat exchanger fan at the upper limit of its rated power range improves indoor air flow while maintaining the compressor's operating frequency. This enhances heat exchange between the indoor air and the indoor heat exchanger, thereby raising the indoor temperature and ensuring continuous heating of the indoor air.

[0164] The fresh air fan is controlled to operate at the upper limit of its rated power range. The indoor heat exchanger continuously heats the room, maintaining a temperature conducive to the release of formaldehyde from indoor furniture and furnishings. 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 fresh air fan drives outdoor fresh air into the room, thereby diluting the indoor formaldehyde concentration and simultaneously expelling the formaldehyde from the room.

[0165] It can be arranged that, in some embodiments, the fresh air fan can deliver fresh air to the room by introducing outdoor fresh air into the room through a fresh air duct, or the fresh air fan can deliver indoor air to the outside to form a negative pressure indoors, and the outdoor fresh air enters the room through door gaps or window gaps.

[0166] In some embodiments, when the air conditioner indoor unit operates 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 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 to turn on the formaldehyde concentration sensor.

[0167] In some embodiments, as the formaldehyde concentration increases, 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 (S1001), 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 (S1002).

[0168] When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration has increased by less than a first preset range within a preset time period, the indoor formaldehyde concentration is considered to have reached equilibrium. Equilibrium refers to a state in which the formaldehyde concentration fluctuates very little within the preset time period. At this point, the fresh air fan is operated at the upper limit of its rated power range, i.e., at its maximum speed. This can rapidly reduce the indoor formaldehyde concentration, improve formaldehyde removal efficiency, and maximize the rapid discharge of indoor formaldehyde to the outside. This completes a formaldehyde removal cycle.

[0169] In some embodiments, as the fresh air fan is started and runs, when the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is lower than a first decrease amplitude of a first preset concentration, the fresh air fan is controlled to run at a fourth power lower than the upper limit of the rated power range of the fresh air fan.

[0170] As the fresh air fan starts running, outdoor fresh air is gradually introduced into the room, the indoor formaldehyde concentration is diluted and gradually decreases, and the indoor temperature and indoor humidity are gradually reduced. The introduction of fresh air will have an increasingly greater impact on the indoor temperature and humidity.

[0171] Long-term high-speed operation of fresh air consumes high energy and makes a lot of noise. When the indoor formaldehyde concentration is constantly decreasing, if a large amount of fresh air is input for a long time, the impact on indoor temperature and humidity will become increasingly greater.

[0172] To achieve the desired indoor temperature, the compressor must constantly adjust its operating frequency to provide sufficient heat for the indoor heat exchanger. Frequent frequency switching shortens the compressor's lifespan and results in higher energy consumption.

[0173] Therefore, in order to maximize the service life of the compressor and reduce the impact of operating noise, the fresh air input in the formaldehyde removal cycle will be adjusted in stages. The speed of the fresh air fan will be adjusted in stages according to the changes in formaldehyde concentration, thereby achieving the purpose of regulating the fresh air input.

[0174] It can be set that, in some embodiments, the first decrease amplitude of the first preset concentration can be set to any value in the range of 0.25 to 0.75 times the first preset concentration, such as 0.25 times, 0.5 times, 0.6 times, 0.75 times, etc. Taking 0.5 times (half) as an example, when the indoor formaldehyde concentration is detected to be lower than half of the first preset concentration, the fresh air fan is controlled to operate at a fourth power lower than the upper limit of the rated power range of the fresh air fan.

[0175] As the fresh air blower is turned on, the indoor formaldehyde concentration gradually decreases. In some embodiments, when the indoor formaldehyde concentration is detected to be lower than a second decrease in magnitude from a first preset concentration, the controller controls the fresh air blower to operate at a fifth power that is lower than an upper limit of the fresh air blower's rated power range. The fifth power is lower than the fourth power, and the second decrease in magnitude from the first preset concentration is lower than the first decrease in magnitude from the first preset concentration.

[0176] To maximize the life of the compressor and minimize the impact of operating noise, the fresh air input during the formaldehyde removal cycle is regulated in multiple levels. The fresh air fan speed is adjusted in stages based on changes in formaldehyde concentration, thereby achieving the goal of regulating the fresh air input. This multi-level adjustment of the fresh air fan speed minimizes indoor temperature fluctuations, avoids compressor frequency switching, extends the compressor's lifespan, and reduces fresh air fan operating noise.

[0177] In some embodiments, 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 corresponding first position, wherein the inner and outer air guide plates both rotate between the corresponding first position and second position, the second position indicating that the corresponding air guide plate is in a closed state, and the first position indicating that the corresponding air guide plate is in a fully open state. At this time, the air guide plate rotates to a position where the air guide blades are parallel to the flow direction of the air outlet gas, that is, the minimum wind blocking position, so as 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.

[0178] In some embodiments, during the step of determining whether the indoor heat exchanger is operating as a condenser during the formaldehyde removal cycle (S601), if the indoor heat exchanger is operating as an evaporator, the controller controls the indoor heat exchanger to switch to operating as a condenser (S1101) and controls the inner and outer air guide plates to rotate to the corresponding first position (S1102), i.e., the corresponding minimum wind blocking position. This reduces resistance to indoor air flowing out of the heat exchange outlet, improves the air conditioner's disturbance effect on the indoor air, and simultaneously heats the indoor air as it flows through the indoor heat exchanger, raising the indoor temperature to facilitate the release of formaldehyde from indoor furniture and home furnishings into the air.

[0179] In some embodiments, in the step of executing the formaldehyde removal cycle and determining whether the indoor heat exchanger is working as a condenser (S601), when the indoor heat exchanger is not working as a condenser, the controller controls the indoor heat exchanger to switch to work as a condenser (S1101), 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 (S1103).

[0180] In this embodiment, based on the foregoing, according to the relationship between the indoor temperature and the first preset temperature detected by the indoor temperature sensor, and the relationship between the indoor humidity and the first preset humidity detected by the indoor humidity sensor, the controller controls the compressor to perform corresponding operations to achieve a high temperature and high humidity indoor environment, thereby further promoting the release of formaldehyde in indoor furniture and home decoration. Details will not be given here. As the formaldehyde concentration increases, when the formaldehyde concentration sensor detects that the growth value of the indoor formaldehyde concentration within a preset time period is less than the first preset range, the fresh air fan is controlled to operate at the upper limit of the rated power range of the fresh air fan. The indoor formaldehyde concentration can be quickly reduced, the formaldehyde removal efficiency can be improved, and the indoor formaldehyde can be quickly discharged outdoors to the maximum extent. At this point, a formaldehyde removal cycle ends.

[0181] In some embodiments, if the human body sensing sensor detects that there is no one indoors, the indoor heat exchanger works as a condenser to perform a formaldehyde removal cycle, and if the controller receives an instruction to run other modes, the controller performs some or all of the following operations: Operation one, control to reduce the operating power of the heat exchange fan so that the heat exchange fan runs at a low speed; Operation two, control to reduce the operating frequency of the compressor, thereby reducing the heating capacity of the indoor heat exchanger; Operation three, control to increase the operating power of the fresh air fan, so that the fresh air fan maintains high-speed operation, thereby discharging the residual formaldehyde content in the room to the outside; Operation four, control the indoor heat exchanger to work as an evaporator, so that the indoor heat exchanger dehumidifies and reduces the indoor humidity.

[0182] In some embodiments, when it is detected that the indoor formaldehyde concentration drops below a second preset concentration, the controller performs some or all of the following operations: operation one, controlling the compressor to stop running; operation two, controlling the heat exchange fan to stop running; operation three, controlling the fresh air fan to stop running.

[0183] At this point, the indoor formaldehyde concentration has fallen to a safe range and is not harmful to humans. Stopping the fresh air blower can reduce energy consumption. While the indoor formaldehyde is being exhausted to the outside through the fresh air blower, running the dehumidification mode gradually reduces the indoor humidity. Stopping the compressor to stop the dehumidification mode can also reduce energy consumption.

[0184] As the indoor air is discharged to the outside through the fresh air fan, the indoor temperature can be lowered. 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.

[0185] In some embodiments, when the formaldehyde removal mode is in operation, the human presence sensor detects that a user has returned home, and the indoor state has changed from unoccupied to occupied (S1601). If the user has not switched the air conditioner to another operating mode, that is, if the controller has not received an instruction to switch to another mode while the formaldehyde removal mode is in operation, the controller controls the formaldehyde concentration sensor to detect the indoor formaldehyde concentration. If the indoor formaldehyde concentration is not lower than a second preset concentration (S1602), the controller performs some or all of the following operations: Operation 1: Controlling the reduction of the operating frequency of the compressor; Operation 2: Controlling the humidifier to stop operation; Operation 3: Controlling the heat exchange fan to operate at the upper limit of the rated power range of the heat exchange fan; Operation 4: Controlling the fresh air fan to operate at the upper limit of the rated power range of the fresh air fan.

[0186] In a specific embodiment shown in FIG16 , the controller is configured to, after executing step S1602, execute step S1603. In step S1603, the controller is configured to reduce the operating frequency of the compressor, stop the humidifier, operate the heat exchange fan at the upper limit of its rated power range, and operate the fresh air fan at the upper limit of its rated power range.

[0187] In some embodiments, the controller controls the reduction of the operating frequency of the compressor so that the compressor operates at the first power of the compressor. The first power of the compressor can be set to any value in the range of 30% to 60% of the upper limit of the rated power of the compressor, such as 30%, 50%, 55%, 60%, etc. 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 temperature and humidity state that is optimal for human comfort. Therefore, the heat exchange amount 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.

[0188] In some embodiments, 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 speed of the heat exchange fan and the speed of the fresh air fan both remain at the maximum speed 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.

[0189] In some embodiments, when the indoor formaldehyde concentration is lower than a second preset concentration (S1603), the operating power of the heat exchange fan and / or the fresh air fan is controlled to be reduced, thereby saving energy consumption during the operation of the air conditioner indoor unit.

[0190] Among them, when the air conditioner runs 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 (indicating that the dehumidification function of the air conditioner is turned on to reduce the indoor humidity).

[0191] In some embodiments, when the formaldehyde removal mode is running, the human body sensing 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 operating modes, that is, when the formaldehyde removal mode is running, when the controller receives an instruction to run other modes, the controller performs some or all of the following operations: Operation one, control the compressor frequency to decrease; Operation two, 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; Operation three, control the fresh air fan to operate at a second power lower than the upper limit of the rated power of the fresh air fan; Operation four, control the indoor heat exchanger to work as an evaporator to dehumidify the indoor heat exchanger.

[0192] In this way, the compressor frequency is controlled to decrease in order to reduce the heat exchange capacity of the indoor heat exchanger, and 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-conditioning indoor unit; 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 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 causing a large impact on the heat load of the indoor space and causing human discomfort; the controller controls the operation of the dehumidification mode and controls the indoor heat exchanger to work as an evaporator, so that the indoor heat exchanger is dehumidified, thereby adjusting the indoor humidity to the humidity value corresponding to the user-set temperature, wherein the controller is internally integrated with the preset humidity values ​​for the recommended optimal comfort corresponding to different temperatures.

[0193] In some embodiments, when the indoor formaldehyde concentration drops below a second preset concentration, the controller performs some or all of the following operations: Operation 1: stopping the fresh air blower; Operation 2: shutting down the fresh air blower; Operation 3: stopping the dehumidification mode. Since the indoor formaldehyde concentration has now dropped to a safe level and poses no risk to users, shutting down the fresh air blower can save energy for the air conditioner's indoor unit.

[0194] In some embodiments, the controller controls the indoor heat exchanger operating mode to switch to a windless mode. In the windless mode, the indoor heat exchanger operating state remains unchanged, and the heat exchange fan is switched to operate at a first power lower than the upper limit of the heat exchange fan rated power, 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 corresponding second position, that is, the corresponding maximum wind blocking position, to avoid direct blowing on the user and avoid causing discomfort to the user.

[0195] In some embodiments, it can be configured that when the indoor formaldehyde concentration is not lower than a second preset concentration, user commands will be blocked and will not take any effect. The controller will not respond to user commands until the indoor formaldehyde concentration falls below 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, a corresponding reminder will be issued, including a voice reminder or a smart interconnection software prompt. The user will need to wait until the indoor formaldehyde concentration falls below the second preset concentration before the user can perform the operation.

[0196] In some embodiments, when the air conditioner indoor unit is also provided with a formaldehyde removal module, if the human body sensing sensor detects that there is no one indoors, the indoor heat exchanger operates as a condenser to perform a formaldehyde removal cycle, and if the controller receives an instruction to operate in other modes, it controls the aldehyde removal module to be turned off so that the aldehyde removal module does not come into contact with the indoor air, thereby increasing the service life of the aldehyde removal module. At this time, the controller may also perform some or all of the following operations: Operation 1, control the reduction of the operating power of the heat exchange fan so that the heat exchange fan operates at a low speed; Operation 2, control the reduction of the operating frequency of the compressor, thereby reducing the heating capacity of the indoor heat exchanger; Operation 3, control the increase of the operating power of the fresh air fan so that the fresh air fan maintains a high-speed operation, thereby discharging the residual formaldehyde content in the room to the outside; Operation 4, control the indoor heat exchanger to operate as an evaporator, so that the indoor heat exchanger performs dehumidification and reduces the indoor humidity.

[0197] In some embodiments, when the formaldehyde removal mode is in operation, the human presence sensor detects that a user has returned home, and the indoor state has changed from unoccupied to occupied, and the user has not switched the air conditioner to another operating mode, that is, when the formaldehyde removal mode is in operation and the controller has not received an instruction to switch to another mode, the controller controls the formaldehyde concentration sensor to detect the indoor formaldehyde concentration. If the indoor formaldehyde concentration is not less than a second preset concentration at this time, the controller may further control the formaldehyde removal module to activate, so that the indoor air contacts the formaldehyde removal module to purify the formaldehyde in the indoor air.

[0198] In some embodiments, the controller controls the reduction of the operating frequency of the compressor so that the compressor operates at the second power of the compressor. The second power of the compressor can be set to any value in the range of 70% to 90% of the upper limit value of the rated power of the compressor, such as 70%, 75%, 80%, 90%, etc.

[0199] Control the humidifier to stop. In formaldehyde removal mode, the indoor temperature and humidity are raised to promote rapid formaldehyde release. The temperature and humidity corresponding to the fastest formaldehyde release efficiency are not optimal for human comfort. Therefore, it is necessary to appropriately reduce the heat exchange rate to lower the indoor temperature. Turning off the humidifier is to quickly reduce the indoor humidity and prevent the discomfort caused by high temperature and humidity.

[0200] 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 speed of the heat exchange fan and the speed of the fresh air fan both remain at the maximum speed 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.

[0201] In some embodiments, when the indoor formaldehyde concentration is lower than a 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.

[0202] 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.

[0203] In some embodiments, when the formaldehyde removal mode is running, the human body sensing 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 operating modes, that is, when the formaldehyde removal mode is running, when the controller receives an instruction to run other modes, the controller performs some or all of the following operations: Operation one, control the compressor frequency to reduce to reduce the heat exchange capacity of the indoor heat exchanger; Operation two, 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, saving energy consumption of the air conditioner indoor unit; Operation three, control 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 the fresh air fan switches to medium speed operation at the second power to prevent the rapid introduction of a large amount of outdoor air from causing a large impact on the heat load of the indoor space and causing discomfort to the human body; Operation four, control the indoor heat exchanger to work as an evaporator to dehumidify the indoor heat exchanger.

[0204] In some embodiments, the controller can also control the dehumidification mode, control the indoor heat exchanger to work as an evaporator, and dehumidify the indoor heat exchanger, thereby adjusting the indoor humidity to the humidity value corresponding to the user-set temperature, wherein the controller is integrated with the recommended optimal comfort humidity values ​​corresponding to different preset temperatures.

[0205] In some embodiments, when the indoor formaldehyde concentration drops below a second preset concentration, the controller performs some or all of the following operations: Operation 1: stopping the fresh air blower; Operation 2: shutting down the fresh air blower; Operation 3: stopping the dehumidification mode. At this point, the indoor formaldehyde concentration has dropped to a safe level and poses no risk to users. Shutting down the fresh air blower can save energy for the air conditioner's indoor unit.

[0206] 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 corresponding second position, that is, the corresponding maximum wind blocking position, to avoid direct blowing on the user and avoid causing discomfort to the user.

[0207] It can be configured that when the indoor formaldehyde concentration is not lower than the second preset concentration, user commands will be blocked and will not take any effect. The controller will not respond to user commands 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, a corresponding reminder will be issued, including a voice reminder or smart interconnection software prompt. The user will need to wait until the indoor formaldehyde concentration is lower than the second preset concentration before the user can perform the operation.

[0208] Still referring to Figures 4-19, in some embodiments, 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, after a preset first time has passed, the controller controls the formaldehyde concentration sensor to turn on to detect the indoor formaldehyde concentration (S2101). The preset first time can be set to two hours.

[0209] In some embodiments, when the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is lower than a second preset concentration (S2102), the fresh air fan is controlled to stop running, and the indoor heat exchanger and humidifier are controlled to maintain a working state (S2103), at which time a formaldehyde removal cycle ends.

[0210] In some embodiments, when the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is below a second preset concentration, the indoor formaldehyde concentration has dropped to a safe, low concentration and is harmless to humans. Stopping the fresh air blower can save energy. Controlling the indoor heat exchanger and humidifier to maintain an operating state can prevent the introduction of fresh air from causing a significant drop in indoor temperature and humidity, maintaining a high temperature and high humidity indoors. This allows the indoor high temperature and high humidity environment to continue releasing formaldehyde from primary indoor furniture into the air even after the formaldehyde concentration drops below the second preset concentration.

[0211] In some embodiments, when the indoor temperature sensor detects that the indoor temperature is not less than a first preset temperature, and the indoor humidity sensor detects that the indoor humidity is not less than a first preset humidity, the controller may control the formaldehyde concentration sensor to activate to detect the indoor formaldehyde concentration after a first preset time interval. In some embodiments, when the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is less than a second preset concentration, the fresh air blower may be controlled to stop operating, and the indoor heat exchanger and humidifier may be controlled to maintain an operating state, at which point a formaldehyde removal cycle ends.

[0212] In some embodiments, the preset first time can be set to any value in the range of 1.5 to 3 hours, such as 1.5 hours, 2 hours, 3 hours, etc.

[0213] In some embodiments, when the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is not lower than the preset amplitude of the second preset concentration (S2104), the fresh air blower is controlled to turn on (S2105). At this time, the next formaldehyde removal cycle starts.

[0214] At this time, when the indoor formaldehyde concentration rises to a preset amplitude not lower than the second preset concentration, the fresh air fan is controlled to turn on to reduce the indoor formaldehyde concentration. The fresh air fan drives outdoor fresh air into the room, thereby diluting the indoor formaldehyde concentration and squeezing the formaldehyde out of the room.

[0215] In some embodiments, the preset amplitude of the second preset concentration may be set as a multiple of the second preset concentration.

[0216] In some embodiments, the preset amplitude of the second preset concentration can be set to any value within the range of 1.5 to 3 times the second preset concentration, such as 1.5 times, 2 times, 3 times, etc. That is, when the detected indoor formaldehyde concentration is higher than twice the second preset concentration, it indicates that the furniture and furnishings are releasing a large amount of formaldehyde into the indoor air. At this time, turning on the fresh air fan can drive outdoor fresh air into the room, thereby diluting the indoor formaldehyde concentration.

[0217] In some embodiments, when the formaldehyde removal mode is running, the human body sensing sensor detects that the user returns home again, and the user adjusts the air conditioner to other operating modes, that is, when the formaldehyde removal mode is running, when the controller receives an instruction to run other modes, the controller controls the formaldehyde concentration sensor to detect the indoor formaldehyde concentration.

[0218] In some embodiments, when the indoor formaldehyde concentration is not lower than a second preset concentration, 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 operate at the upper limit of the rated power range of the heat exchange fan, and the fresh air fan is controlled to operate at the upper limit of the rated power range of the fresh air fan.

[0219] When the formaldehyde removal mode is running, the indoor environment is a high temperature and high humidity environment that promotes the release of formaldehyde. The high temperature and high humidity environment is not the best temperature and humidity state for human comfort. It is necessary to control and reduce the heat exchange of the indoor heat exchanger to lower the indoor temperature. Turning off the humidifier is to quickly reduce the indoor humidity and prevent the high temperature and high humidity environment indoors from causing discomfort to the human body.

[0220] The heat exchange fan is operated at the upper limit of its rated power range to promote a disturbance effect on the indoor air. The fresh air fan is operated at the upper limit of its rated power range to introduce a large amount of fresh air into the room, prompting the indoor formaldehyde concentration to drop below the second preset concentration as quickly as possible.

[0221] It can be set that at this time, the controller obtains the position of the indoor user through the human body sensing sensor, and the inner and outer air guide plates are rotated to switch to the position where air is discharged away from people. Since the indoor temperature and humidity at this time are not suitable for the user, indoor air or outdoor suction air is prevented from blowing towards the user, thereby avoiding causing discomfort to the user.

[0222] In some embodiments, when a formaldehyde removal cycle ends and before the next cycle begins, that is, when the indoor formaldehyde concentration is not less than a second preset concentration and is less than a preset amplitude of the second preset concentration (S2106), the indoor heat exchanger operates as a condenser. At this time, when the controller receives a command to turn off the formaldehyde removal mode (S2107), the controller controls the human presence sensor to detect whether there is anyone in the room (S2108).

[0223] In some embodiments, when the human presence sensor detects that no one is indoors, the fresh air blower is controlled to stop operating, and the air conditioner operates in dehumidification mode (S2109). The indoor heat exchanger is controlled to operate as an evaporator, causing the indoor heat exchanger to dehumidify. To prevent high indoor formaldehyde concentrations during this period, the dehumidification mode is operated so that when the indoor air flows through the indoor evaporator, formaldehyde in the indoor air condenses into condensed water along with moisture in the air. The formaldehyde is then discharged to the outside along with the condensed water, thereby reducing the indoor formaldehyde concentration and indoor humidity.

[0224] In some embodiments, when it is detected that the indoor formaldehyde concentration is lower than a second preset concentration, the indoor formaldehyde concentration is low and no further formaldehyde removal cycle is required, and the compressor is controlled to stop running.

[0225] In some embodiments, when the air conditioner operates in a dehumidification mode, the air conditioner performs a dehumidification cycle of the air conditioner indoor unit by using a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger.

[0226] In some embodiments, the dehumidification cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air, providing cooling to the indoor space through the refrigerant's heat absorption process, thereby achieving temperature regulation of the indoor space.

[0227] The compressor compresses the low-temperature, low-pressure refrigerant gas and discharges it into a high-temperature, high-pressure refrigerant gas, which then flows into the outdoor heat exchanger. The outdoor heat exchanger condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0228] 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.

[0229] The indoor heat exchanger evaporates the refrigerant expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The indoor heat exchanger achieves a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the indoor air.

[0230] 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.

[0231] In some embodiments, when a certain formaldehyde removal cycle ends and before the next cycle starts, the indoor heat exchanger operates as a condenser. When the controller receives a command to turn off the formaldehyde removal mode, the controller controls the human body sensing sensor to detect whether there is anyone in the room.

[0232] In some embodiments, when the human body sensing sensor detects that there is someone 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 dehumidification mode (S2110), 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 (S2111), the compressor and the fresh air fan are controlled to stop running (S2112).

[0233] The fresh air blower is turned on to prevent high-concentration formaldehyde from causing harm to the human body when the indoor formaldehyde concentration is not lower than the second preset concentration but lower than the preset amplitude of the second preset concentration. Switching the fresh air blower to the first power level can prevent the rapid introduction of a large amount of outdoor air from causing a significant impact on the indoor space's heat load and causing human discomfort.

[0234] 20-24 , in some embodiments, a formaldehyde removal cycle may be configured to include: controlling the indoor heat exchanger to operate as a condenser, the controller controlling the indoor temperature sensor to detect the indoor temperature, and the controller controlling the indoor humidity sensor to detect the indoor humidity.

[0235] In some embodiments, when the indoor temperature sensor detects that the indoor temperature is lower than a first preset temperature and the indoor humidity sensor detects that the indoor humidity is not lower than a first preset humidity (S609), the controller controls to increase the operating frequency of the compressor so that the compressor operates at the upper limit of the rated power range of the compressor, so that the indoor heat exchanger operates at the maximum heating power; the controller controls to turn on the humidifier (S2001).

[0236] 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 turns on the humidifier.

[0237] In some embodiments, the controller increases the heat exchange capacity 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.

[0238] When the indoor humidity falls below a first preset humidity, the humidifier is activated to raise the indoor humidity. This high humidity environment can increase the release of formaldehyde from furniture into the air. Increasing the compressor frequency to raise the indoor temperature further promotes formaldehyde release from furniture.

[0239] 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 at the same time, the humidifier is controlled to be turned on.

[0240] In some embodiments, the controller activates a humidifier to increase indoor humidity. A high humidity indoor environment can increase the release of formaldehyde from indoor furniture into the air. In conjunction with heating from an indoor heat exchanger to increase indoor temperature, a high temperature and high humidity indoor environment can further promote the release of formaldehyde from indoor furniture.

[0241] 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 compressor and the indoor heat exchanger are controlled to stop running to save energy. The humidifier is controlled to stop running, and the heat exchange fan is controlled to operate at the upper limit of the rated power range of the heat exchange fan.

[0242] In some embodiments, the controller controls the humidifier to stop running, so that when the indoor humidity is not lower than the first preset humidity, the indoor humidity environment can be maintained at high humidity even if the humidifier is not turned on, thereby saving energy consumption. The high temperature and high humidity indoor environment can further promote the release of formaldehyde in indoor furniture.

[0243] Controlling the heat exchange fan to operate at the upper limit of its rated power range can promote indoor air flow, enhance the disturbance effect of the indoor air, and promote the release of formaldehyde from furniture into the indoor air. In some embodiments, when the formaldehyde removal mode is in operation, the human presence sensor detects that the user has returned home again, and the user switches the air conditioner to another operating mode, that is, when the formaldehyde removal mode is in operation, when the controller receives an instruction to operate another mode, the controller controls the formaldehyde concentration sensor to detect the indoor formaldehyde concentration. When the indoor formaldehyde concentration is not less than a second preset concentration, the formaldehyde removal module is activated, and indoor air flows through the formaldehyde removal module to purify the formaldehyde in the indoor air, thereby reducing the indoor formaldehyde concentration.

[0244] In some embodiments, when the formaldehyde concentration sensor detects that the indoor formaldehyde concentration has dropped below a second preset concentration, the controller controls the heat exchange fan to operate at a second power level lower than the upper limit of the heat exchange fan's rated power range, and controls the fresh air fan to operate at a third power level lower than the upper limit of the fresh air fan's rated power range. At this point, the indoor formaldehyde concentration is low and poses no risk to humans. Reducing the power of the heat exchange fan and fresh air fan reduces energy consumption for the air conditioner.

[0245] In some embodiments, when the formaldehyde concentration sensor detects that the indoor formaldehyde concentration drops below a second preset concentration, the adjustments of the various components of the air conditioner follow the instructions sent by the user, that is, the air conditioner can operate in the corresponding mode according to the instructions sent by the user.

[0246] In some embodiments, when a certain formaldehyde removal cycle ends and before the next cycle starts, the indoor heat exchanger operates as a condenser. When the controller receives a command to turn off the formaldehyde removal mode, the controller controls the human body sensing sensor to detect whether there is anyone in the room.

[0247] When the human presence sensor detects that no one is indoors, the fresh air blower stops and the indoor heat exchanger operates as an evaporator, dehumidifying the room. To prevent high formaldehyde concentrations in the room, the dehumidification mode is activated. When the indoor air flows through the evaporator, the formaldehyde in the indoor air condenses into condensed water along with the moisture in the air. The formaldehyde is then discharged outdoors along with the condensed water, thereby reducing the indoor formaldehyde concentration and humidity.

[0248] 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 no further formaldehyde removal cycle is required, and the compressor is controlled to stop running.

[0249] In some embodiments, when the air conditioner operates in a dehumidification mode, the air conditioner performs a dehumidification cycle of the air conditioner indoor unit by using a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger.

[0250] In some embodiments, the dehumidification cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air, providing cooling to the indoor space through the refrigerant's heat absorption process, thereby achieving temperature regulation of the indoor space.

[0251] The compressor compresses the low-temperature, low-pressure refrigerant gas and discharges it into a high-temperature, high-pressure refrigerant gas, which then flows into the outdoor heat exchanger. The outdoor heat exchanger condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0252] 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.

[0253] The indoor heat exchanger evaporates the refrigerant expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The indoor heat exchanger achieves a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the indoor air.

[0254] 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.

[0255] In some embodiments, when a certain formaldehyde removal cycle ends and before the next cycle starts, the indoor heat exchanger operates as a condenser. When the controller receives a command to turn off the formaldehyde removal mode, the controller controls the human body sensing sensor to detect whether there is anyone in the room.

[0256] When the human body sensing sensor detects that there is someone 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 running.

[0257] The fresh air blower is turned on to prevent high-concentration formaldehyde from causing harm to the human body when the indoor formaldehyde concentration is not lower than the second preset concentration but lower than the preset amplitude of the second preset concentration. Switching the fresh air blower to the first power level can prevent the rapid introduction of a large amount of outdoor air from causing a significant impact on the indoor space's heat load and causing human discomfort.

[0258] At this time, the indoor heat exchanger is controlled to operate as an evaporator, causing the indoor heat exchanger to dehumidify. To prevent high indoor formaldehyde concentrations at this time, the dehumidification mode is activated. When the indoor air flows through the indoor evaporator, the formaldehyde in the indoor air condenses into condensed water along with the moisture in the air. The formaldehyde is then discharged to the outside along with the condensed water, thereby reducing the indoor formaldehyde concentration and indoor humidity, bringing the indoor humidity below the second preset humidity to avoid causing discomfort to the user.

[0259] In some embodiments, the value of the second preset humidity can be set to any value in the range of 30% to 70%, such as 30%, 35%, 50%, 70%, etc.

[0260] When it is detected that the indoor formaldehyde concentration is lower than the second preset concentration, the indoor formaldehyde concentration is low and will not cause harm to the human body. The controller controls the compressor and the fresh air fan to stop running, which can save energy consumption of the air conditioner.

[0261] It can be set that when a certain formaldehyde removal cycle ends and before the next cycle starts, the indoor heat exchanger works as a condenser. When the controller receives a command to turn off the formaldehyde removal mode, the controller controls the human induction sensor to detect whether there is anyone in the room.

[0262] In some embodiments, when a formaldehyde removal module is installed in the air conditioner indoor unit, and a human presence sensor detects the presence of a person in the room, the controller controls the formaldehyde removal module to start and run for a second preset time. The second preset time can be set to any value in the range of 15 to 45 minutes, such as 15 minutes, 18 minutes, 30 minutes, 45 minutes, etc. As a result, when the indoor air flows through the formaldehyde removal module, the formaldehyde removal module purifies the formaldehyde in the air, thereby quickly reducing the indoor formaldehyde concentration and preventing harm to the human body.

[0263] In some embodiments, the controller can also be configured to perform some or all of the following operations: Operation one, control the fresh air fan to operate at a first power that is lower than the upper limit of the rated power range of the fresh air fan; Operation two, control the indoor heat exchanger to work as an evaporator to dehumidify the indoor heat exchanger.

[0264] In some embodiments, when it is detected that the indoor formaldehyde concentration is lower than a second preset concentration, the compressor and / or the fresh air blower are controlled to stop running.

[0265] When it is detected that the indoor formaldehyde concentration is lower than the second preset concentration, the indoor formaldehyde concentration is low 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 formaldehyde removal module to shut down, which can save energy consumption of the air conditioner.

[0266] In some embodiments, when the formaldehyde removal mode is turned off, the controller controls the air conditioner to issue a voice reminder, or issues a reminder through the smart interconnection software, or controls the formaldehyde removal indicator light on the display panel to turn off, thereby reminding the user that the formaldehyde removal mode is turned off. When the formaldehyde removal mode is turned on, the formaldehyde removal indicator light on the display panel is turned on.

[0267] In summary, in some embodiments, referring to FIG. 23 , when the air conditioner includes a humidifier, the controller is configured to: control the indoor temperature sensor to detect the indoor temperature, and control the indoor humidity sensor to detect the indoor humidity (S2301); when the indoor temperature is lower than a first preset temperature and the indoor humidity is not lower than the first preset humidity (S2302), control the operating frequency of the compressor to increase, and control the humidifier to be turned on (S2303); when the indoor temperature is lower than the first preset temperature and the indoor humidity is lower than the first preset humidity (S2304), control the operating frequency of the compressor to increase, and control the humidifier to be turned on (S2305); when the indoor temperature is not lower than the first preset temperature and the indoor humidity is lower than the first preset humidity (S2306), the operating frequency of the compressor remains unchanged, and control the humidifier to be turned on (S2307); when the indoor temperature is not lower than the first preset temperature and the indoor humidity is not lower than the first preset humidity (S2308), the compressor stops running, the humidifier stops running, and the heat exchange fan operates at the upper limit of the rated power range of the heat exchange fan (S2309).

[0268] As a specific embodiment, referring to FIG. 24 , the controller is configured to: control the indoor temperature sensor to detect the indoor temperature, control the indoor humidity sensor to detect the indoor temperature ( S2401 ), and the indoor temperature is not lower than a first preset temperature, When the indoor humidity is not lower than the first preset humidity (S2402), the compressor stops running, the humidifier stops running, the heat exchange fan runs at the upper limit of the rated power range of the heat exchange fan (S2403), and the formaldehyde concentration sensor is turned on (S2404). When the growth value of the indoor formaldehyde concentration within the preset time period is less than the first preset range, the fresh air fan is controlled to run at the upper limit of the rated power of the fresh air fan (S2405). When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is lower than the first preset concentration by a first decrease amplitude (S2406), the fresh air fan is controlled to run at a fourth power lower than the upper limit of the rated power range of the fresh air fan (S2407). When the indoor formaldehyde concentration is lower than the second decrease amplitude of the first preset concentration (S2408), the fresh air fan is controlled to run at a fifth power lower than the upper limit of the rated power range of the fresh air fan (S2409).

[0269] After an overall overview of the workflow of the air conditioner in this application, the workflow of the air conditioner in this application is explained below using a specific embodiment as an example.

[0270] Example 1

[0271] As shown in Figures 1 to 3, 25, and 29, in some embodiments of the air-conditioning indoor unit of the present application, the air-conditioning indoor unit includes: a shell 100, a heat exchange fan, an indoor heat exchanger, a humidifier, a fresh air fan, a formaldehyde concentration sensor, and a controller, wherein the controller is configured to: when the indoor formaldehyde concentration is not less than a first preset threshold value, control the operation of a first logic: control the turning on of the fresh air fan; when the indoor formaldehyde concentration is less than the first preset threshold value and not less than the second preset threshold value, control the operation of a second logic: control the indoor heat exchanger to be used as a condenser to make the indoor temperature reach a second preset temperature; control the humidifier to be turned on to make the indoor humidity reach a second preset humidity; start the fresh air fan; when the indoor formaldehyde concentration is less than the second preset threshold value, control the operation of a third logic: control the indoor heat exchanger to be used as a condenser to make the indoor temperature reach a third preset temperature; control the humidifier to be turned on to make the indoor humidity reach a third preset humidity; the third preset temperature is higher than the second preset temperature, and the third preset humidity is higher than the second preset humidity.

[0272] Through the above solution, after the formaldehyde removal mode is turned on, the air-conditioning indoor unit can selectively implement formaldehyde removal logic under different indoor formaldehyde concentrations, differentiate according to actual usage scenarios, and ensure that the formaldehyde removal effect is optimal.

[0273] In this embodiment, the third preset temperature is higher than the second preset temperature, and the third preset humidity is higher than the second preset humidity. It should be noted that the first preset threshold value can be the same value as the first preset concentration, or a value set according to actual needs, the second preset temperature can be the same value as the first preset temperature, or a value set according to actual needs, and the second preset humidity can be the same value as the first preset humidity, or a value set according to actual needs, and this application does not make specific limitations.

[0274] When the indoor temperature reaches the third preset temperature and the indoor humidity reaches the third preset humidity, formaldehyde can be released from the furniture into the indoor air at a faster speed; the fresh air fan is used to transport outdoor fresh air into the room, and the indoor air containing formaldehyde is discharged outdoors, completing the discharge of formaldehyde.

[0275] In some embodiments, when the formaldehyde removal mode is turned on, the controller determines whether the room is unoccupied or occupied, and then selects to run the first logic, the second logic, or the third logic according to the indoor formaldehyde concentration.

[0276] In some embodiments, the controller is configured to: when it is determined that the room is unoccupied, control the operation of the first logic, the second logic or the third logic according to the indoor formaldehyde concentration, so as to improve the release and removal efficiency of indoor formaldehyde when no one is living there.

[0277] In some embodiments, the controller is configured to: when it is detected that there are people living in the room, run the first logic or the second logic according to the indoor formaldehyde concentration control, so that when there are people living in the room, high heating and humidification are not performed, and the release and removal efficiency of indoor formaldehyde is improved without affecting the user experience of the indoor users.

[0278] In reality, unoccupied spaces can be caused by a new home being renovated or completed, or by a temporary absence. Since no one lives indoors, the humidity and temperature don't need to be adjusted to suit the user. The higher the temperature, the faster bound formaldehyde is released into free formaldehyde. Similarly, the higher the humidity, the faster bound formaldehyde is released into free formaldehyde.

[0279] If there are people living in the room, maintaining a high temperature and / or high humidity will affect the user experience. Therefore, when the controller detects that there are people in the room, only the first and second logics will be executed to remove formaldehyde, ensuring that the indoor temperature and humidity do not affect the user experience.

[0280] In some embodiments, the controller may determine whether a room is occupied or unoccupied by detecting whether there is someone in the room through an infrared sensor, or by allowing the user to set whether the room is occupied or unoccupied.

[0281] In some embodiments, after the air conditioner indoor unit turns on the formaldehyde removal mode, when the controller obtains that the room is unoccupied (S2501), and the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is not less than the first preset threshold value (S2502), it means that the concentration of free formaldehyde in the indoor air is relatively high at this time, and even the indoor formaldehyde concentration has reached saturation. For example, the room has just been renovated, resulting in the accumulation of high concentrations of formaldehyde indoors. At this time, the controller controls the operation of the first logic (S2503), and only turns on the fresh air blower (S2503') to quickly transport outdoor fresh air into the room, and by utilizing the fresh air function of the air conditioner, the rate of formaldehyde diffusion to the outdoors is increased. After the outdoor fresh air enters the room, the free formaldehyde in the room is expelled to the outdoors under the action of slight positive pressure or two-way fresh air exchange, so that the indoor formaldehyde concentration value drops rapidly.

[0282] In some embodiments, when the first logic is executed, the fresh air blower is continuously turned on.

[0283] It can be set that, in some embodiments, when running the first logic, the formaldehyde concentration sensor detects the indoor formaldehyde concentration in real time. When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is less than the first preset threshold and not less than the second preset threshold, the controller controls the operation of the second logic to improve formaldehyde removal efficiency and energy saving.

[0284] In some embodiments, the required input fresh air volume is calculated based on the indoor formaldehyde concentration and the indoor room volume, and the rotation speed of the fresh air fan is controlled by the input fresh air volume so that the fresh air volume reaches the required input fresh air volume requirement.

[0285] In some embodiments, the rotational speed of the fresh air fan can be proportional to the calculated input fresh air volume. Specifically, the greater the required input fresh air volume, the faster the rotational speed of the fresh air fan, thereby introducing a larger amount of fresh air and reducing indoor formaldehyde concentration. The smaller the required input fresh air volume, the slower the rotational speed of the fresh air fan, thereby reducing indoor formaldehyde concentration while also reducing power consumption and achieving energy conservation.

[0286] In some embodiments, after the air conditioner indoor unit turns on the formaldehyde removal mode, when the controller obtains that the room is unoccupied and the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is less than the first preset threshold and not less than the second preset threshold (S2504), the controller controls the operation of the second logic (S2505): the controller controls the indoor heat exchanger to be used as a condenser and the heat exchange fan to be turned on to make the indoor temperature reach the second preset temperature; at the same time, the controller controls the humidifier to be turned on to make the indoor humidity reach the second preset humidity; and starts the fresh air fan (S2505', S2505").

[0287] In some embodiments, when the second logic is executed, the fresh air fan is continuously turned on, thereby accelerating the emission of free formaldehyde in the indoor air to the outside.

[0288] It is understood that, in some embodiments, the indoor temperature reaching the second preset temperature includes: the indoor temperature being equal to the second preset temperature and the indoor temperature being higher than the second preset temperature. The indoor humidity reaching the second preset humidity includes: the indoor humidity being equal to the second preset humidity and the indoor humidity being higher than the second preset humidity.

[0289] It can be set that, in some embodiments, when running the first logic, the formaldehyde concentration sensor detects the indoor formaldehyde concentration in real time. When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is less than the second preset threshold, the control runs the third logic to improve formaldehyde removal efficiency and energy saving.

[0290] In some embodiments, after the air conditioner indoor unit is in formaldehyde removal mode, when the controller detects that the room is unoccupied (S2501) and the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is less than a second preset threshold (S2506), the controller executes a third logic (S2507): the controller controls the indoor heat exchanger to function as a condenser, turns on the heat exchange fan, and when indoor air flows through the indoor heat exchanger, the indoor air is heated by the indoor heat exchanger and flows into the room through the heat exchange outlet, thereby raising the indoor temperature to a third preset temperature. It is understood that the indoor temperature reaching the third preset temperature includes: the indoor temperature being equal to the third preset temperature and the indoor temperature being higher than the third preset temperature.

[0291] When the controller operates the third logic, the indoor heat exchanger is controlled to operate as a condenser for cooling, and the humidifier is activated to humidify the indoor air, so that the indoor air humidity reaches a third preset humidity. It is understood that the indoor humidity reaching the third preset humidity includes: the indoor humidity being equal to the third preset humidity and the indoor humidity being higher than the third preset humidity.

[0292] In some embodiments, when the third logic is running, when it is detected that the indoor formaldehyde concentration is not less than the second preset threshold, the controller controls the fresh air blower to be turned on, thereby accelerating the emission of free formaldehyde in the indoor air to the outside.

[0293] When the controller controls the operation of the second logic and the third logic, it can still calculate the required input fresh air volume based on the indoor formaldehyde concentration and the indoor room volume, and control the rotation speed of the fresh air fan by the input fresh air volume so that the fresh air volume reaches the required input fresh air volume. It can be set that the rotation speed of the fresh air fan is proportional to the calculated input fresh air volume. That is, the larger the required input fresh air volume, the faster the rotation speed of the fresh air fan, so as to introduce a large amount of fresh air and reduce the indoor formaldehyde concentration. The smaller the required input fresh air volume, the slower the rotation speed of the fresh air fan, so as to reduce the indoor formaldehyde concentration while reducing power consumption and achieving energy-saving effects.

[0294] In some embodiments, referring to FIG. 28 , after the air conditioner indoor unit turns on the formaldehyde removal mode, when the controller detects that the room is occupied (S2801), it determines whether the indoor formaldehyde concentration detected by the formaldehyde concentration sensor is greater than a third preset threshold value (S2802). If so, the controller controls the operation of the first logic (S2503): turning on the fresh air blower (S2503') to quickly deliver outdoor fresh air to the room. By utilizing the fresh air function of the air conditioner, the rate of formaldehyde diffusion to the outdoors is increased. After the outdoor fresh air enters the room, the free formaldehyde in the room is expelled to the outside under the action of slight positive pressure or two-way fresh air exchange, causing the indoor formaldehyde concentration value to drop rapidly.

[0295] It can be set that when running the first logic, the formaldehyde concentration sensor detects the indoor formaldehyde concentration in real time. When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is not greater than the third preset threshold, the controller controls the operation of the second logic to improve formaldehyde removal efficiency and energy saving.

[0296] In some embodiments, referring to FIG. 28 , after the air conditioner indoor unit turns on the formaldehyde removal mode, when the controller obtains that the indoor space is occupied (S2801), it determines whether the indoor formaldehyde concentration detected by the formaldehyde concentration sensor is greater than a third preset threshold value (S2802). If not, the controller controls the operation of the second logic (S2505): the controller controls the indoor heat exchanger to be used as a condenser, and the heat exchange fan is turned on to make the indoor temperature reach the second preset temperature; at the same time, the humidifier is controlled to be turned on to make the indoor humidity reach the second preset humidity (S2505', S2505"). The higher indoor temperature and higher indoor humidity promote the release of bound formaldehyde into the indoor air. When the second logic is running, the fresh air fan is started at the same time. When the second logic is running, the fresh air fan is continuously turned on, thereby accelerating the emission of free formaldehyde in the indoor air to the outside.

[0297] In some embodiments, the third preset threshold may be the national safety standard value for formaldehyde. When the indoor formaldehyde concentration is higher than the third preset threshold, there is a risk that the indoor formaldehyde is harmful to the human body, so fresh air is turned on to expel the indoor formaldehyde.

[0298] In some embodiments, when determining the relationship between the current indoor formaldehyde concentration and a second preset threshold, a buffer difference is added to or subtracted from the second preset threshold before performing the calculation. This prevents the fresh air blower from repeatedly turning on and off when the current formaldehyde concentration approaches the second preset formaldehyde concentration.

[0299] In some embodiments, referring to Figures 31 to 33, when a formaldehyde removal module is also provided in the indoor unit of the air conditioner, the controller is configured to: when controlling the operation of one of the first logic, the second logic or the third logic, also turn on the formaldehyde removal module (S3101), and while removing the formaldehyde-containing air in the room through the fresh air fan, further improve the formaldehyde removal effect through the formaldehyde removal module, thereby quickly removing the air containing formaldehyde in the room and improving the speed of formaldehyde removal.

[0300] In some embodiments, since the second preset temperature is lower than the third preset temperature, and the second preset humidity is lower than the third preset humidity, when the third logic is running, the indoor formaldehyde concentration is relatively low. In order to facilitate the release of indoor bound formaldehyde into free formaldehyde, it is necessary to increase the indoor temperature and humidity. Raising the indoor temperature to a third preset temperature higher than the second preset temperature can promote the release of indoor bound formaldehyde into free formaldehyde. At the same time or after a certain period of time, raising the indoor humidity to a second preset humidity higher than the first preset humidity is more conducive to promoting the release of indoor bound formaldehyde into free formaldehyde.

[0301] In some embodiments, when the control runs the third logic, when the indoor formaldehyde concentration is not less than the second preset threshold, the fresh air fan is controlled to turn on so as to quickly discharge the indoor formaldehyde.

[0302] In some embodiments, when the control runs the third logic, when it is detected that the indoor formaldehyde concentration is less than the second preset threshold, the timing starts (S2508), and when it is detected that the indoor formaldehyde concentration is not less than the second preset threshold, the timing stops; when the timing starts and after the first preset time has passed, when the indoor formaldehyde concentration is continuously less than the second preset threshold during the timing time, the control turns off the humidifier, that is, when the timing starts and after the first preset time has passed, when the indoor formaldehyde concentration is continuously less than the second preset threshold during the timing time (S2509), the control turns off the formaldehyde removal mode (S2510). At this time, the indoor formaldehyde concentration is low, and there is no need to keep the formaldehyde removal mode turned on. When the indoor heat exchanger is on at this time, the control stops running the indoor heat exchanger. When the fresh air fan is on at this time, the control stops running the fresh air fan. When the humidifier is on at this time, the control stops running the humidifier.

[0303] In some embodiments, a preset temperature range and a preset humidity range are preset in the controller, the values ​​of the second preset temperature and the third preset temperature are within the preset temperature range, and the values ​​of the second preset humidity and the third preset humidity are within the preset humidity range, to ensure that the second preset temperature and the third preset temperature, the second preset humidity and the third preset humidity are the values ​​that can be reached by the indoor heat exchanger and the humidifier.

[0304] In some embodiments, the first preset threshold and the second preset threshold are set by the user, or are preset by the air conditioner at the factory, or are sent from the cloud.

[0305] Following the workflow of the air conditioner shown in FIG25 , the workflow will be introduced below using a specific embodiment as an example.

[0306] In some embodiments, referring to Figures 26 and 27, the controller is configured to: after obtaining that the room is unoccupied (S2501), control the formaldehyde concentration sensor to detect the indoor formaldehyde concentration, and determine whether the indoor formaldehyde concentration is not less than a first preset threshold value (S2502); if so, control the operation of the first logic (S2503); if not, determine whether the indoor formaldehyde concentration is not less than a second preset threshold value (S2504); if so, control the operation of the second logic (S2505), if not, control the operation of the third logic (S2507).

[0307] In some embodiments, referring to FIG30 , when the controller controls the operation of the third logic (S2507), the timing starts (S3001), the indoor heat exchanger is used as a condenser, the humidifier is turned on (S3002), the indoor temperature is controlled to reach the third preset temperature, and the indoor humidity is controlled to reach the third preset humidity (S3003). When the indoor formaldehyde concentration is not less than the second preset threshold, the fresh air fan is turned on (S3004). After the first preset time, when the indoor formaldehyde concentration continues to be less than the second preset threshold within the timing time (S3005), the formaldehyde removal mode is turned off (S3006).

[0308] In some embodiments, referring to Figure 33, when the air-conditioning indoor unit is provided with a formaldehyde removal module, when the controller controls the operation of the third logic (S2507), the formaldehyde removal module is turned on (S3101), the timing is started (S3301), the indoor heat exchanger is used as a condenser, the humidifier is turned on (S3302), the indoor temperature is controlled to reach the third preset temperature, and the indoor humidity is controlled to reach the third preset humidity (S3303). When the indoor formaldehyde concentration is not less than the second preset threshold, the fresh air fan is turned on (S3304). After the first preset time, when the indoor formaldehyde concentration continues to be less than the second preset threshold within the timing time (S3305), the formaldehyde removal mode is turned off (S3306).

[0309] Example 2

[0310] As shown in Figures 1 to 3 and Figure 34, in some embodiments of the air conditioner of the present application, the air conditioner includes: a housing 100, a heat exchange fan, an indoor heat exchanger, a humidifier, a fresh air fan, a formaldehyde removal module and a controller, and the controller is configured to: enter the first mode, the second mode or the third mode according to the scene; in some embodiments, the controller is configured to: after entering the formaldehyde removal mode (S3401), determine whether the current scene is in a long-term unoccupied state (S3402), if so, enter the first mode (S3403); if not, determine whether the current scene is in a short-term unoccupied state (S3404), if so, enter the second mode (S3405); if not, determine whether the current scene is in a state of being occupied (S3406), if so, enter the third mode (S3407), if not, end the process.

[0311] In some embodiments, in the first mode, the indoor heat exchanger is controlled to be used as a condenser to make the indoor temperature reach a fourth preset temperature; the humidifier is controlled to be turned on to make the indoor humidity reach a fourth preset humidity; and the fresh air blower is started (S3403');

[0312] In some embodiments, in the second mode, the indoor heat exchanger is controlled to be used as a condenser to make the indoor temperature reach a fifth preset temperature; the humidifier is controlled to be turned on to make the indoor humidity reach a fifth preset humidity; and the fresh air blower is started (S3405');

[0313] In some embodiments, in the third mode, the formaldehyde removal module is turned on ( S3407 ′).

[0314] In some embodiments, the fourth preset temperature is higher than the fifth preset temperature; the fourth preset humidity is higher than the fifth preset humidity. It should be noted that the fourth preset temperature can be the same as the third preset temperature, or a value set according to actual needs; the fifth preset temperature can be the same as the second preset temperature, or a value set according to actual needs; the fourth preset humidity can be the same as the third preset humidity, or a value set according to actual needs; the fifth preset humidity can be the same as the second preset humidity, or a value set according to actual needs; and this application does not impose specific limitations.

[0315] In this application, the first mode, the second mode and the third mode are distinguished according to long-term unoccupied, short-term occupied and occupied, which can cover most scenarios and ensure that the corresponding formaldehyde removal mode can be used for the above three scenarios, thereby improving the formaldehyde removal efficiency, improving the formaldehyde removal effect and reducing energy consumption.

[0316] In practice, long-term unoccupied housing is often the case when a new house is being renovated or completed. At this time, the indoor formaldehyde content is usually high, and because no one lives indoors for a long time, the indoor humidity and temperature do not need to be taken into account by the user. The higher the temperature, the faster the formaldehyde precipitates, and the higher the humidity, the faster the formaldehyde precipitates. Setting the fourth preset temperature higher than the fifth preset temperature and the fourth preset humidity higher than the fifth preset humidity allows formaldehyde to precipitate from the furniture at a faster rate. The formaldehyde is in the indoor air, and at this time, the outdoor fresh air fan is used to blow outdoor air into the room. The indoor air containing formaldehyde is discharged outdoors under the action of air pressure, completing the formaldehyde discharge.

[0317] The second mode is typically when the user has already checked in but is temporarily away from home. The formaldehyde content is lower than in the first mode. Therefore, a second preset temperature and humidity value, lower than in the first mode, is used.

[0318] In the third mode, there are already users in the room, and if the indoor temperature and humidification are increased, it will affect the user experience. Therefore, the formaldehyde removal module is used to remove formaldehyde, which will not affect the indoor temperature and humidity.

[0319] In some embodiments, the difference between long-term unoccupied and short-term unoccupied is whether the duration or date of unoccupied time exceeds a set value, which can be set by the user, sent from the cloud, or preset when the air conditioner leaves the factory.

[0320] In some embodiments, the user can choose to enter the first mode, the second mode, and the third mode according to needs.

[0321] In some embodiments, a formaldehyde concentration sensor is also provided in the shell 100, which is configured to: detect the formaldehyde content in the current indoor air to obtain the current formaldehyde content value; please refer to Figures 35 to 37, the controller is configured to: in the first mode, when the indoor temperature reaches the fourth preset temperature and the indoor humidity reaches the fourth preset humidity, control the formaldehyde concentration sensor to detect and obtain the current formaldehyde content value (S3501); if the current formaldehyde content value is greater than the first preset formaldehyde content value, start the fresh air fan (S3502).

[0322] In some embodiments, the first preset formaldehyde content value is obtained based on experiments. If it is determined that the current formaldehyde content value is higher than the first preset formaldehyde content value, it means that the formaldehyde content has reached saturation, and only heating and humidification will not have much effect. Therefore, the fresh air fan is turned on to pump outdoor fresh air into the room, so that the indoor air containing formaldehyde is discharged outdoors to complete the formaldehyde removal.

[0323] In some embodiments, the first predetermined formaldehyde content value is the national safety standard value for formaldehyde, i.e., the aforementioned third predetermined threshold value. If the first predetermined formaldehyde content value is exceeded, it will cause harm to indoor users, so fresh air is turned on to exhaust the indoor formaldehyde.

[0324] In some embodiments, the housing 100 is provided with an indoor temperature sensor and / or a humidity sensor.

[0325] In some embodiments, the fresh air blower has a first fresh air speed and a second fresh air speed, and the first fresh air speed is greater than the second fresh air speed.

[0326] Please refer to Figures 35 to 37. The controller is configured as follows: after entering the first mode, control the indoor temperature sensor and humidity sensor to obtain the indoor temperature value and indoor humidity value respectively (S3701); determine whether the indoor temperature value is greater than the fourth preset temperature (S3702); if so, keep the current state unchanged (S3703); if not, control the indoor heat exchanger to be used as a condenser (S3704); determine whether the indoor humidity value is greater than the fourth preset humidity (S3705); if so, keep the current state unchanged (S3706); if not, start the humidifier (S3707).

[0327] In some embodiments, a formaldehyde concentration sensor is controlled to obtain a current formaldehyde content value (S3501), and a determination is made as to whether the current formaldehyde content value is greater than a first preset formaldehyde content value (S3502). If not, the current state is maintained (S3703). If so, a fresh air blower is activated (S3502) and the fresh air blower is controlled to operate at a first fresh air speed (S3503). After the fresh air blower is activated, a determination is made as to whether the current formaldehyde content value is greater than the first preset formaldehyde content value (S3506). If so, the current state is maintained, i.e., step S3503 is executed. If not, the first mode is exited (S3505).

[0328] In some embodiments, when determining the relationship between the current formaldehyde content and a first preset formaldehyde content, a buffer difference is added to or subtracted from the first preset formaldehyde content before performing the calculation. This prevents the fresh air blower from repeatedly turning on and off when the current formaldehyde content approaches the first preset formaldehyde content.

[0329] In some embodiments, the controller is configured to, in the first mode, control the indoor heat exchanger and humidifier to be turned off when the fresh air blower is turned on. This is because when the fresh air blower is turned on, indoor air is removed, which has little effect on heating and humidifying the room. Therefore, turning off the indoor heat exchanger and humidifier saves costs.

[0330] Please refer to Figures 38 to 41. In some embodiments, the controller is configured to: in the second mode, start the fresh air blower at the same time or after a certain period of time to turn on the formaldehyde removal module.

[0331] In some embodiments, in the second mode, the formaldehyde-containing air in the room is removed by the fresh air blower, and the formaldehyde removal effect is further improved by the formaldehyde removal module, ensuring that the formaldehyde-containing air in the room can be quickly removed when the user may return home at any time, thereby increasing the speed of formaldehyde removal.

[0332] In some embodiments, the controller is configured to, in the second mode, perform some or all of the following operations when the indoor temperature reaches a fifth preset temperature and the indoor humidity reaches a fifth preset humidity: Operation 1: shut down the indoor heat exchanger; Operation 2: shut down the humidifier; Operation 3: start the fresh air blower; Operation 4: start the formaldehyde removal module. Because starting the fresh air blower removes indoor air, which has little effect on indoor heating and humidification, shutting down the indoor heat exchanger and humidifier saves costs.

[0333] Referring to Figures 38 to 41 , in some embodiments, the controller is configured such that: after entering the second mode, the user sets a first set time (S3801). In this application, the first set time is the time when the user will be out, and the second mode must be exited after the first set time has passed. During the second mode, the remaining time after reaching the first set time is the second set time.

[0334] In some embodiments, in the second mode, when the indoor temperature reaches a fifth preset temperature and the indoor humidity reaches a fifth preset humidity; if the user inputs a specific instruction, the indoor heat exchanger and humidifier are turned off and the fresh air blower is started.

[0335] In this application, if the user inputs a specific instruction (S4101), the current operation is interrupted, the fresh air fan is turned on to discharge the air containing formaldehyde in the room, and the fresh air fan is controlled to run at the first fresh air speed (S4102).

[0336] In some embodiments, the specific instruction is an instruction for the user to return home suddenly, that is, the user needs to exit the second mode before the first set time.

[0337] Please refer to Figures 38 to 41. In some embodiments, the controller is configured to: in the second mode, when the indoor temperature reaches the fifth preset temperature and the indoor humidity reaches the fifth preset humidity; calculate the time when the current formaldehyde content value reaches the second preset formaldehyde content value and obtain the waiting time (S3804). If the waiting time is greater than the second set time, turn off the indoor heat exchanger and humidifier and start the fresh air fan (S3805).

[0338] In some embodiments, if the waiting time exceeds a second set time, it indicates that the indoor formaldehyde content under the current operating conditions will not reach the second preset formaldehyde content within the second set time. Therefore, the fresh air blower is activated, using outdoor fresh air to expel the indoor air containing formaldehyde through air pressure. This ensures that formaldehyde removal is completed within the time specified in the second mode, ensuring that the indoor formaldehyde-containing air has been largely expelled by the time the user returns home, thereby preventing harm to the user's health.

[0339] In some embodiments, the second preset formaldehyde content value is less than the first preset formaldehyde content value because in the second mode, it is the scenario where the user often lives. Therefore, the standard of the second preset formaldehyde content value is lowered to reduce the formaldehyde content in the air as much as possible to reduce the harm of formaldehyde to the human body.

[0340] Please refer to Figures 38 to 41. In some embodiments, the controller is configured as follows: after entering the second mode, the user sets the first set time (S3801), and calculates the second set time in real time, and controls the indoor temperature sensor and the humidity sensor to obtain the indoor temperature value and the indoor humidity value respectively. Determine whether the indoor temperature value is greater than the fifth preset temperature (S4001). If so, keep the current state unchanged (S4002); if not, control the indoor heat exchanger to be used as a condenser (S4003). Determine whether the indoor humidity value is greater than the fifth preset humidity (S4004). If so, keep the current state unchanged (S4005); if not, start the humidifier (S4006). Control the formaldehyde concentration sensor to obtain the current formaldehyde content value (S3802), determine whether the current formaldehyde content value is greater than the second preset formaldehyde content value (S3803), and calculate the waiting time for the current formaldehyde content value to reach the second preset formaldehyde content value (S3804).

[0341] Determine whether the waiting time is greater than or equal to the second set time (S3807). If so, turn off the indoor heat exchanger and humidifier, turn on the fresh air fan, and control the fresh air fan to run at the second fresh air speed for a preset time (S3808). If not, turn off the indoor heat exchanger and humidifier, turn on the fresh air fan, and control the fresh air fan to run at the first fresh air speed (S3805).

[0342] After the first set time is reached, the formaldehyde concentration sensor is controlled to obtain the current formaldehyde content value and determine whether the formaldehyde content value is greater than the first preset formaldehyde content value (S3809). If not, exit the second mode (S3806); if so, enter the third mode (S3407).

[0343] Please refer to Figure 42. In some embodiments, the controller is configured to: after entering the third mode (S3407), control the formaldehyde concentration sensor to detect and obtain the current formaldehyde content value (S4201); determine whether the current formaldehyde content value is greater than the third preset formaldehyde content value (S4202); if the current formaldehyde content value is greater than the third preset formaldehyde content value, start the fresh air fan (S4203) and start the formaldehyde removal module (S4205).

[0344] In some embodiments, the fresh air blower operates at a second fresh air speed (S4204). When there are people in the room, if the formaldehyde content is too high, that is, exceeds a third preset formaldehyde content value, it is necessary to quickly expel the indoor formaldehyde. Therefore, the indoor air containing formaldehyde is exhausted by outdoor fresh air, and the formaldehyde removal module is used to remove the formaldehyde. This removes the indoor formaldehyde in the fastest way, reduces the user's exposure to high formaldehyde concentrations, and protects the user's health.

[0345] Referring to FIG. 42 , in some embodiments, the controller is configured to: in the third mode, if the current formaldehyde content is less than a third predetermined formaldehyde content, only the fresh air blower is activated ( S4207 ), and the fresh air blower operates at a second fresh air speed ( S4208 ). At this point, the indoor formaldehyde content is low, and only the outdoor fresh air is used to exhaust the indoor air containing formaldehyde, saving energy and costs.

[0346] In some embodiments, the controller is configured to: in the third mode, after the fresh air fan has been running for a preset time, exit the third mode (S4209); if the preset time has not been reached, re-determine the relationship between the current formaldehyde content value and the third preset formaldehyde content value, and perform a corresponding cycle (S4206).

[0347] In some embodiments, the third predetermined formaldehyde content value is lower than the first predetermined formaldehyde content value.

[0348] In some embodiments, the preset time is set by the user, or is preset by the air conditioner at the factory, or is sent from the cloud.

[0349] In some embodiments, the fourth preset temperature is the maximum temperature that the air conditioner can heat up or the upper limit of the temperature range that the air conditioner can heat up, and the fourth preset humidity is the maximum humidity value that the humidifier can humidify or the upper limit of the humidity range that the air conditioner can humidify.

[0350] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An air conditioner, comprising: 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 humidifier, which is disposed in the housing, and is configured to: generate steam, and the steam flows to the outside of the housing through the heat exchange outlet; The indoor temperature sensor is configured to: detect the indoor temperature; The indoor humidity sensor is configured to: detect indoor humidity; 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: 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 and the humidifier is controlled to be turned on.

2. The air conditioner according to claim 1, wherein the controller is configured as follows: 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.

3. The air conditioner according to claim 1, wherein the controller is configured as follows: 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.

4. The air conditioner according to claim 1, further comprising: The heat exchange fan is configured to: transport indoor air to the room through the heat exchange air outlet; The fresh air fan is configured to: transport outdoor fresh air to indoor areas; 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, the heat exchange fan is controlled to operate at the upper limit of the rated power range of the heat exchange fan, and the fresh air fan is controlled to operate at the upper limit of the rated power range of the fresh air fan.

5. The air conditioner according to claim 1, wherein the controller is configured as follows: When the controller obtains that the current date is a preset date, the controller controls the indoor heat exchanger to work as a condenser.

6. The air conditioner according to claim 1, further comprising: The fresh air fan is configured to: transport outdoor fresh air to indoor areas; The formaldehyde concentration sensor is configured to: detect indoor formaldehyde concentration; The controller is configured to: When the indoor temperature is not lower than a first preset temperature and the indoor humidity is not lower than a first preset humidity, after a preset first time, the formaldehyde concentration sensor is controlled to turn on; When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is lower than the second preset concentration, the fresh air blower is controlled Stop the operation and control the indoor heat exchanger and the humidifier to maintain the working state; When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is not lower than a preset amplitude of a second preset concentration, the fresh air blower is controlled to turn on.

7. The air conditioner according to claim 1, further comprising: The formaldehyde concentration sensor is configured to: detect indoor formaldehyde concentration; The fresh air fan is configured to: transport outdoor fresh air to indoor areas; The heat exchange fan is configured to: transport indoor air to the room through the heat exchange air outlet; The human body sensing sensor is configured to: detect whether there is someone in the room; The controller is configured to: When the human body sensing sensor detects that there is someone in the room and the indoor formaldehyde concentration is not lower than a second preset concentration, 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 operate at the upper limit of the rated power range of the heat exchange fan, and the fresh air fan is controlled to operate at the upper limit of the rated power range of the fresh air fan.

8. The air conditioner according to claim 1, further comprising: The human body sensing sensor is configured to: detect whether there is someone in the room; The controller is configured to: When the indoor heat exchanger works as a condenser and the human body sensing sensor detects that there is someone 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 a second preset concentration, the compressor and the fresh air fan are controlled to stop running.

9. The air conditioner according to claim 1, further comprising: The human body sensing sensor is configured to: detect whether there is someone in the room; The controller is configured to: When the indoor heat exchanger works as a condenser and the human body sensing sensor detects that there is no one in the room, the fresh air blower is controlled to stop running, 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 is controlled to stop running.

10. The air conditioner according to claim 1, further comprising: The heat exchange fan is configured to: drive the indoor air to be transported to the indoor through the heat exchange air outlet; The human body sensing sensor is configured to: detect whether there is someone in the room; The formaldehyde concentration sensor is configured 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 a human body sensing 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 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.

11. The air conditioner according to claim 10, wherein the controller is configured as follows: 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.

12. The air conditioner according to claim 10, wherein the controller is configured as follows: When the indoor heat exchanger works as a condenser, the indoor temperature sensor is controlled to detect the indoor temperature. Controlling the indoor humidity sensor to detect 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.

13. The air conditioner according to claim 10, wherein the controller is configured as follows: 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.

14. The air conditioner according to claim 10, wherein the controller is configured as follows: 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.

15. The air conditioner according to claim 10, further comprising: The fresh air fan is configured 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.

16. The air conditioner according to claim 10, further comprising: The fresh air fan is configured to: transport outdoor fresh air to indoor areas; The controller is configured to: When the human body 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.

17. The air conditioner according to claim 10, wherein the controller is configured as follows: When the indoor heat exchanger works as a condenser and the presence of someone in the room is detected by the human body 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.

18. The air conditioner according to claim 17, wherein the controller is configured as follows: When the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is lower than a second preset concentration, the fresh air fan is controlled to stop running.

19. An air conditioner, comprising: Air conditioner indoor 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; The indoor temperature sensor is configured to: detect the indoor temperature; The indoor humidity sensor is configured to: detect indoor humidity; The formaldehyde concentration sensor is configured to: detect indoor formaldehyde concentration; 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. Controlling the indoor humidity sensor to detect 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, controlling to turn on the formaldehyde concentration sensor; 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 value 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 amplitude of the first preset concentration, the fresh air fan is controlled to operate at a fourth power lower than the upper limit of the rated power range of the fresh air fan.

20. An air conditioner, comprising: 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; The heat exchange fan is configured 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 configured to: generate steam, and the steam flows to the outside of the housing through the heat exchange outlet; The formaldehyde removal module is configured to remove formaldehyde in the air flowing through the formaldehyde removal module; The human body sensing sensor is configured to: detect whether there is someone in the room; The indoor temperature sensor is configured to: detect the indoor temperature; The indoor humidity sensor is configured to: detect indoor humidity; The formaldehyde concentration sensor is configured 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 body sensing 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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