air conditioner

Abstract

This application relates to an air conditioner including an indoor air conditioner unit, an air conditioner fan, an indoor heat exchanger, an outdoor air fan, and a controller. The controller enters a first stage in response to the activation of a formaldehyde removal mode, and controls the indoor heat exchanger as a condenser so that the indoor temperature reaches a second preset temperature. After the operating time of the first stage reaches a first preset time, the controller enters a second stage, and controls the indoor heat exchanger as an evaporator. In the second stage, condensed water is generated in the indoor heat exchanger, and formaldehyde in the indoor air is dissolved in the condensed water. Furthermore, after the operating time of the second stage reaches a second preset time, the controller enters a third stage, controls the indoor heat exchanger as a condenser, and activates the outdoor air fan. In the third stage, the condensed water in which formaldehyde has been dissolved evaporates and is discharged to the outside by the action of the outdoor air fan.

Description

Technical Field

[0001] (Related Application) This application claims the priority of Chinese Patent Application No. 202310738578.6 filed on June 20, 2023, the priority of Chinese Patent Application No. 202310735756.X filed on June 20, 2023, the priority of Chinese Patent Application No. 202310738534.3 filed on June 20, 2023, the priority of Chinese Patent Application No. 202310801416.2 filed on June 30, 2023, the priority of Chinese Patent Application No. 202310801432.1 filed on June 30, 2023, and the priority of Chinese Patent Application No. 202310946837.4 filed on July 28, 2023, and all of its contents are incorporated herein by reference.

[0002] This application relates to the technical field of air conditioning equipment, and particularly to air conditioners.

Background Art

[0003] An air conditioner, that is, an air-conditioning unit, is a device that uses artificial means to adjust and control parameters such as the temperature, humidity, and flow rate of the environmental air inside a building or structure. An air conditioner usually includes an air-conditioning indoor unit and an air-conditioning outdoor unit, and some air conditioners have a formaldehyde removal function.

[0004] In related technologies, air conditioners with formaldehyde removal functions often use adsorption modules to reduce formaldehyde in indoor air. Adsorption modules are generally made of activated carbon or other adsorption materials. However, air conditioners equipped with adsorption modules have a complex structure and are expensive, and because they use a single formaldehyde removal method, they have low efficiency in removing formaldehyde and require frequent replacement of the formaldehyde removal filter. As a result, they cannot implement different formaldehyde removal methods depending on different indoor environments, and there is a problem that low formaldehyde removal effectiveness leads to high energy consumption. [Overview of the Initiative]

[0005] Some embodiments of the present application include an air conditioner, the air conditioner, the indoor unit, a casing from which a heat exchange air outlet is opened; an indoor heat exchanger installed inside the casing, which performs heat exchange between a refrigerant flowing inside and indoor air to form a heating cycle or a cooling cycle, and the indoor air after heat exchange flows to the outside of the casing via the heat exchange air outlet; a heat exchange fan configured to drive indoor air and send it into the room via the heat exchange air outlet; a humidifier installed inside the casing, which is configured to generate steam and flow to the outside of the casing; a human body detection sensor configured to detect whether or not a person is present in the room; an indoor temperature sensor configured to detect the indoor temperature; an indoor humidity sensor configured to detect the indoor humidity; and an outdoor fan installed inside the casing, the outdoor fan being configured to detect the outside of the room when it is rotating in the forward direction. The air conditioner includes an outside fan, which is driven to introduce air into the room via the outside fan, and an outside fan, which is driven to discharge indoor air to the outside when the outside fan rotates in reverse, and a controller. The controller, when the human body detection sensor detects that a person is present in the room, defines the indoor temperature currently set in the air conditioner as the first temperature when the indoor heat exchanger operates as a condenser, sets a first humidity corresponding to the first temperature in the controller, and when the indoor humidity sensor detects that the indoor humidity is equal to or greater than the first humidity, controls the humidifier to maintain its current operating state and controls the outside fan to rotate in the forward direction at a first power lower than the upper limit of the rated power range. If the indoor humidity sensor detects that the indoor humidity is lower than the first humidity, controls the humidifier to operate at a second power lower than the upper limit of the rated power range.

[0006] Some embodiments of the present application include an air conditioner, the air conditioner, the indoor unit, a casing from which a heat exchange air outlet is opened, an indoor heat exchanger installed inside the casing which performs heat exchange between a refrigerant flowing inside and indoor air to form a heating cycle or a cooling cycle and which causes the indoor air after heat exchange to flow to the outside of the casing via the heat exchange air outlet, a heat exchange fan configured to drive indoor air and send it into the room via the heat exchange air outlet, a formaldehyde removal module configured to remove formaldehyde from the air passing through the formaldehyde removal module, a humidifier installed inside the casing which is configured to generate steam and flow to the outside of the casing, a human body detection sensor configured to detect whether or not a person is present in the room, an indoor temperature sensor configured to detect the indoor temperature, an indoor humidity sensor configured to detect the indoor humidity, and an outside air fan installed inside the casing which the outside air The system includes an outside fan that, when rotating forward, drives outside air into the room via the outside fan, and when rotating backward, drives indoor air into the room via the outside fan, and a controller, wherein the controller, when the human body detection sensor detects that a person is present in the room, activates the formaldehyde removal module and controls the indoor air to pass through the formaldehyde removal module, when the indoor heat exchanger operates as a condenser, defines the indoor temperature currently set in the air conditioning indoor unit as the first temperature, sets a first humidity corresponding to the first temperature in the controller, and when the indoor humidity sensor detects that the indoor humidity is equal to or greater than the first humidity, controls the humidifier to maintain its current operating state, controls the outside fan to rotate forward at a first power lower than the upper limit of the rated power range, and when the indoor humidity sensor detects that the indoor humidity is lower than the first humidity, controls the humidifier to operate at a second power lower than the upper limit of the rated power range. [Brief explanation of the drawing]

[0007] [Figure 1]This is a schematic diagram of the overall configuration of an air conditioner according to several embodiments of the present invention. [Figure 2A] This is a schematic diagram of the overall configuration of a hanging-type air conditioning indoor unit according to several embodiments of the present application. [Figure 2B] This is a front view of a hanging-type indoor air conditioning unit according to one embodiment of the present invention. [Figure 2C] This is a cross-sectional view of a hanging-type indoor air conditioning unit according to several embodiments of the present application. [Figure 3A] This is a schematic diagram of the overall configuration of a vertical (cabinet type) air conditioning indoor unit according to several embodiments of the present application. [Figure 3B] This is a front view of a vertical (cabinet type) indoor air conditioning unit according to several embodiments of the present application. [Figure 3C] This is a schematic diagram of the overall configuration of a vertical (cabinet type) air conditioning indoor unit according to several embodiments of the present application, and an enlarged schematic diagram of the configuration of part A. [Figure 4] This is the first flowchart of the operation of an air conditioning indoor unit according to some embodiments of the present application when it detects the presence of a person in a room. [Figure 5] This is the second flowchart of the operation of an air conditioning indoor unit according to some embodiments of the present application when it detects the presence of a person in the room. [Figure 6] This is the third flowchart of the operation when an air conditioning indoor unit according to some embodiments of the present application detects the presence of a person in the room. [Figure 7] This is flowchart #4 of the operation when an air conditioning indoor unit according to some embodiments of the present application detects the presence of a person in the room. [Figure 8] This is flowchart #5 of the operation when an air conditioning indoor unit according to some embodiments of the present application detects the presence of a person in the room. [Figure 9] This is the first flowchart of the operation of an air conditioning indoor unit according to some embodiments of the present invention when it detects that there is no person in the room. [Figure 10]This is the second flowchart of the operation of an air conditioning indoor unit according to some embodiments of the present invention when it detects that there is no person in the room. [Figure 11] This is the third flowchart of the operation when an air conditioning indoor unit according to some embodiments of the present application detects that there is no person in the room. [Figure 12] This is flowchart #4 of the operation when an air conditioning indoor unit according to some embodiments of the present application detects that there is no person in the room. [Figure 13] This is flowchart #5 of the operation of an air conditioning indoor unit according to some embodiments of the present application when it detects that there is no person in the room. [Figure 14] This is flowchart #6 of the operation when an air conditioning indoor unit according to some embodiments of the present application detects that there is no person in the room. [Figure 15] This is flowchart #7 of the operation of an air conditioning indoor unit according to some embodiments of the present application when it detects that there is no person in the room. [Figure 16] This is flowchart #8 of the operation when an air conditioning indoor unit according to some embodiments of the present application detects that there is no person in the room. [Figure 17] This is flowchart #9 of the operation of an air conditioning indoor unit according to some embodiments of the present application when it detects that there is no person in the room. [Figure 18] This is flowchart 10 of the operation of an air conditioning indoor unit according to some embodiments of the present invention when it detects that there is no person in the room. [Figure 19] This is flowchart 11 of the operation of an air conditioning indoor unit according to some embodiments of the present application when it detects that there is no person in the room. [Figure 20] This is flowchart 12 of the operation of an air conditioning indoor unit according to some embodiments of the present application when it detects that there is no person inside the room. [Figure 21] This is the first operation flowchart of a hanging-type air conditioner according to several embodiments of the present invention. [Figure 22] It is the second operation flowchart of the wall-mounted air conditioner according to some embodiments of the present application. [Figure 23] It is the third operation flowchart of the wall-mounted air conditioner according to some embodiments of the present application. [Figure 24] It is the fourth operation flowchart of the wall-mounted air conditioner according to some embodiments of the present application. [Figure 25] It is the fifth operation flowchart of the wall-mounted air conditioner according to some embodiments of the present application. [Figure 26] It is the sixth operation flowchart of the wall-mounted air conditioner according to some embodiments of the present application. [Figure 27] It is the seventh operation flowchart of the wall-mounted air conditioner according to some embodiments of the present application. [Figure 28] It is the eighth configuration schematic diagram of the wall-mounted air conditioner according to some embodiments of the present application. [Figure 29] It is the first configuration schematic diagram of another wall-mounted air conditioner according to some embodiments of the present application. [Figure 30] It is the second operation flowchart of another wall-mounted air conditioner according to some embodiments of the present application. [Figure 31] It is the third operation flowchart of another wall-mounted air conditioner according to some embodiments of the present application. [Figure 32] It is the fourth operation flowchart of another wall-mounted air conditioner according to some embodiments of the present application. [Figure 33] It is the fifth operation flowchart of another wall-mounted air conditioner according to some embodiments of the present application. [Figure 34] It is the sixth operation flowchart of another wall-mounted air conditioner according to some embodiments of the present application. [Figure 35] It is the seventh operation flowchart of another wall-mounted air conditioner according to some embodiments of the present application. [Figure 36] It is the first operation flowchart of the formaldehyde removal mode according to some embodiments of the present application. [Figure 37] This is the second operation flowchart of the formaldehyde removal mode according to some embodiments of the present application. [Figure 38] This is the third flowchart of the operation of the formaldehyde removal mode according to some embodiments of the present application. [Figure 39] This is the fourth flowchart of the operation of the formaldehyde removal mode according to some embodiments of the present application. [Figure 40] This is a timing chart of an outdoor fan, air guide plate, humidifier, air conditioner fan, and indoor heat exchanger according to several embodiments of the present application, at different preset outdoor temperatures. [Figure 41] This is the fifth flowchart of the operation of the formaldehyde removal mode according to some embodiments of the present application. [Figure 42] This is the sixth flowchart of the operation of the formaldehyde removal mode according to some embodiments of the present application. [Figure 43] This is the seventh flowchart of the operation of the formaldehyde removal mode according to some embodiments of the present application. [Figure 44] This is the 8th flowchart of the operation of the formaldehyde removal mode according to some embodiments of the present application. [Figure 45] This diagram shows schematic representations of the operating states of an air conditioner fan and compressor at different energy-saving levels according to several embodiments of the present invention. [Figure 46] This is the ninth flowchart of the operation of the formaldehyde removal mode according to some embodiments of the present application. [Figure 47] This is flowchart 10 of the operation of the formaldehyde removal mode according to some embodiments of the present application. [Figure 48] This is the 11th flowchart of the operation of the formaldehyde removal mode according to some embodiments of the present application. [Figure 49] This is the 12th flowchart of the operation of the formaldehyde removal mode according to some embodiments of the present application. [Figure 50]This diagram shows the relationship between the outdoor fan (rotation speed) and the indoor formaldehyde concentration according to several embodiments of the present application. [Modes for carrying out the invention]

[0008] In the description of this application, the orientations or positional relationships indicated by terms such as “center,” “vertical,” “horizontal,” “length,” “width,” “thickness,” “top,” “bottom,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” “outside,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” are based on the orientations or positional relationships shown in the accompanying drawings and are merely for the purpose of simplifying the description of this disclosure. They do not express or suggest that the devices or elements shown have a particular orientation or must be configured and operated in a particular orientation, and should therefore not be construed as limiting this disclosure.

[0009] In this application, unless otherwise specified, terms such as "attachment," "connection," "bonding," and "fixing" should be understood in a broad sense. For example, they may refer to fixed connections, removable connections, integrated connections, mechanical connections, electrical connections, connections that allow communication between elements, indirect connections via an intermediate medium, or internal communication or interaction between two elements. Those skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.

[0010] In this application, the presence of the first feature "above" or "below" the second feature may mean that the first and second features are in contact, or that they are indirectly in contact via an intermediate medium. Furthermore, the presence of the first feature "above," "above," and "on the top surface" of the second feature means that the first feature is directly above or diagonally above the second feature, or simply means that the horizontal height of the first feature is greater than that of the second feature. The presence of the first feature "below," "below," and "on the bottom surface" of the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than that of the second feature.

[0011] In this application, terms such as “one embodiment,” “several embodiments,” “example,” “specific example,” or “several examples” mean that the specific features, structures, materials, or properties described with reference to such embodiment or example are included in at least one embodiment or example of this application. In this specification, a general expression for the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or properties described may be combined in an appropriate manner in any one or more embodiments or examples. Furthermore, a person skilled in the art may combine different embodiments or examples and features of different embodiments or examples described herein, provided that they do not conflict with each other.

[0012] The present application will be described in detail below with reference to exemplary embodiments. However, unless further described, elements, structures, and features of one embodiment can be beneficially combined with other embodiments.

[0013] In this invention, when an air conditioner operates in cooling mode, the air conditioner uses a compressor, an outdoor heat exchanger (also called an outdoor heat exchanger), an expansion valve, and an indoor heat exchanger (also called an indoor heat exchanger) to perform the cooling cycle of the indoor unit of the air conditioner.

[0014] The cooling cycle involves a series of processes including compression, condensation, expansion, and evaporation, supplying a refrigerant to conditioned and heat-exchanged air, and thereby regulating the temperature of the indoor space by supplying cool air to the indoor space through the refrigerant's heat absorption process.

[0015] The compressor compresses the refrigerant gas in a low-temperature, low-pressure state and discharges the refrigerant gas in a high-temperature, high-pressure state, which is then fed into the outdoor heat exchanger. The outdoor heat exchanger condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0016] The expansion valve expands the high-temperature, high-pressure liquid phase refrigerant, which has condensed in the outdoor heat exchanger, into a low-pressure liquid phase refrigerant.

[0017] The indoor heat exchanger evaporates the refrigerant that has expanded in the expansion valve, returning the refrigerant gas in a low-temperature, low-pressure state to the compressor. The indoor heat exchanger achieves a cooling effect by utilizing the latent heat of vaporization of the refrigerant to exchange heat with the indoor air.

[0018] An air conditioning indoor unit can regulate the temperature of the indoor space throughout the entire cooling cycle.

[0019] When an air conditioner operates in heating mode, it executes the heating cycle of the indoor unit of the air conditioner using the compressor, outdoor heat exchanger, expansion valve, and indoor heat exchanger.

[0020] The heating cycle involves a series of processes including compression, condensation, expansion, and evaporation, supplying a refrigerant to conditioned and heat-exchanged air, and then supplying heat to the indoor space through the refrigerant's heat dissipation process, thereby achieving temperature control in the indoor space.

[0021] During heating cycle operation, the compressor compresses the refrigerant gas in a low-temperature, low-pressure state and discharges the refrigerant gas in a high-temperature, high-pressure state, which is then fed into the indoor heat exchanger. The indoor heat exchanger condenses the compressed refrigerant into a liquid phase, and the heat generated by this condensation is exchanged with the indoor air passing through the indoor heat exchanger, thereby raising the indoor temperature.

[0022] The expansion valve expands the high-temperature, high-pressure liquid phase refrigerant, which has condensed in the outdoor heat exchanger, into a low-pressure liquid phase refrigerant.

[0023] The outdoor heat exchanger evaporates the refrigerant expanded by the expansion valve and returns the refrigerant gas in a low-temperature, low-pressure state to the compressor. The outdoor heat exchanger may also exchange heat with the outdoor air through the latent heat of vaporization of the refrigerant.

[0024] An air conditioning indoor unit can regulate the temperature of the indoor space throughout the entire heating cycle.

[0025] An air conditioning outdoor unit includes at least a compressor and an outdoor heat exchanger, also called the outdoor unit of the air conditioner; that is, the outdoor unit of the air conditioner refers to the part of the cooling cycle that includes the compressor and the outdoor heat exchanger. An air conditioning indoor unit includes at least an indoor heat exchanger, also called the indoor unit of the air conditioner. An expansion valve may be provided in either the air conditioning indoor unit or the air conditioning outdoor unit.

[0026] The indoor heat exchanger and the outdoor heat exchanger function as either a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioning indoor unit functions as a heater in heating mode, and when the indoor heat exchanger functions as an indoor heat exchanger, the air conditioning indoor unit functions as a cooler in cooling mode.

[0027] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0028] As shown in Figures 1, 2A, 2B, 2C, 3A, 3B, and 3C, in some embodiments of the air conditioner of the present invention, the air conditioner includes an indoor air conditioner unit. In some embodiments, the air conditioner includes an outdoor air conditioning unit 200. In some embodiments, the air conditioning outdoor unit 200 includes a compressor. In some embodiments, the air conditioning outdoor unit 200 includes an outdoor heat exchanger. In some embodiments, the indoor air conditioning unit includes an indoor heat exchanger. In some embodiments, the expansion valve may be provided in the air conditioning indoor unit or the air conditioning outdoor unit 200.

[0029] In some embodiments, as shown in Figures 1, 2A, 2B, and 2C, the indoor air conditioning unit may be of the hanging type and installed inside the room.

[0030] In some embodiments, as shown in Figures 3A, 3B, and 3C, the indoor air conditioning unit may be of a vertical (or cabinet) type and installed inside the room.

[0031] In some embodiments, the air conditioner includes an indoor heat exchanger, an outdoor heat exchanger, a compressor, an expansion valve, and piping for circulating a refrigerant, with both the indoor and outdoor heat exchangers communicating with the compressor.

[0032] In some embodiments, the expansion valve is an electronic expansion valve, which is connected between the indoor heat exchanger and the outdoor heat exchanger and can expand the liquid refrigerant that has undergone the condensation process into a low-pressure liquid refrigerant.

[0033] In some embodiments, the compressor includes an intake port and an exhaust port. The refrigerant, which has absorbed heat and undergone an evaporation process, enters the compressor through the intake port. The compressor compresses the gaseous refrigerant to a high-temperature, high-pressure state, and then discharges it through the exhaust port.

[0034] In some embodiments, the indoor heat exchanger and the outdoor heat exchanger are each connected to the compressor via a four-way valve in the refrigerant circuit.

[0035] 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. The compressor's intake port is fixedly connected to the first valve port, and the compressor's exhaust port is fixedly connected to the third valve port.

[0036] In some embodiments, the refrigerant in the refrigerant circuit can circulate by sequentially passing through the compressor, indoor heat exchanger, expansion valve, and outdoor heat exchanger.

[0037] 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.

[0038] 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.

[0039] In some embodiments, the air conditioning indoor unit includes a casing 100, an indoor heat exchanger, a humidifier, a heat exchange fan, an outside air intake module, an indoor temperature sensor, an indoor humidity sensor, a formaldehyde concentration sensor, and a human body detection sensor.

[0040] The casing 100 forms the overall appearance of the air conditioning indoor unit, and in some embodiments, the indoor heat exchanger, heat exchange fan, and outdoor fan are located inside the casing 100.

[0041] In some embodiments, the casing 100 is provided with an indoor air inlet, an outdoor air inlet, a heat exchange air outlet, and an outdoor air outlet.

[0042] In some embodiments, an indoor heat exchanger is provided inside the casing 100 and performs heat exchange between the refrigerant flowing inside and the indoor air to form a heating cycle or a cooling cycle. After the indoor heat exchanger flows, the indoor air flows to the outside of the casing 100 through a heat exchange air outlet.

[0043] In some embodiments, a cross-flow fan can be selected as the heat exchange fan. When the heat exchange fan is started, indoor air is introduced into the casing 100 by the drive of the heat exchange fan, and the heat exchange fan provides the power for the indoor air to flow from the indoor air inlet through the inside of the casing 100 to the heat exchange air outlet.

[0044] In some embodiments, the heat exchange fan includes a heat exchange fan and a heat exchange drive motor, the heat exchange drive motor rotates the heat exchange fan.

[0045] In some embodiments, indoor air enters the casing 100 through an indoor air inlet, undergoes heat exchange with a heat exchanger, and then flows out into the indoor space from a heat-exchanged air outlet of the casing 100, thereby achieving indoor air supply.

[0046] In some embodiments, the humidifier is located inside the casing 100 and is configured to generate steam, which can be flowed outside the casing 100 through a heat exchange air outlet by the drive of a heat exchange fan.

[0047] In some embodiments, the steam can be directed to the outside of the casing via an outside air outlet by driving an outside air fan.

[0048] In some embodiments, the outside air intake module is provided in the space within the casing 100 of the air conditioning indoor unit.

[0049] In some embodiments, the outside air intake module includes an outside air fan casing, the outside air fan casing is provided with an outside air inlet and an outside air outlet, the outside air inlet is installed to communicate with an outdoor air inlet on the casing 100, and an outside air chamber (also called an outside air duct) is formed within the outside air intake module that connects the outside air inlet and the outside air outlet.

[0050] In some embodiments, the outside air inlet may be provided on the top, front, rear, left, or right side of the outside air fan casing, and correspondingly, the outdoor air inlet may be provided on the top, front, rear, left, or right side of the casing 100, corresponding to the outside air inlet.

[0051] In some embodiments, the outside air outlet is provided around the conditioned air outlet of the casing 100 so that when outside air flows out from the outside air outlet, it is mixed with the conditioned air flowing out from the heat exchange air outlet. This reduces the significant impact of outside air on the temperature and humidity of the indoor environment and improves comfort when using the outside air intake module.

[0052] In some embodiments, the outside air outlet may be provided on the top, front, rear, left, or right side of the casing 100.

[0053] In some embodiments, the outside air intake module includes an outside air fan located within the outside air chamber.

[0054] In some embodiments, the outside fan can be a centrifugal fan, and when the outside fan is started, outside air is introduced into the room through the outside air intake module, and the outside fan provides the power for the outside air to flow from the outside air intake to the outside air outlet.

[0055] In some embodiments, the outside air fan includes a fan and a drive motor, the drive motor which rotates the fan.

[0056] In some embodiments, the outside air fan casing is further provided with an exhaust port that communicates with the interior of the room.

[0057] In some embodiments, a shielding plate is provided inside the outside air fan casing that can rotate to close the outside air outlet or the exhaust port.

[0058] In some embodiments, when the outside fan rotates forward, the shielding plate rotates, closing the exhaust port and opening the outside air outlet. Outdoor air is drawn into the outside fan casing from the outside air inlet by the outside fan's drive and discharged into the room through the outside air outlet.

[0059] In some embodiments, when the outside fan rotates in reverse, the shielding plate rotates, closing the outside air outlet and opening the exhaust port. Indoor air is drawn into the outside fan casing through the exhaust port by the operation of the outside fan and discharged outside through the outside air inlet.

[0060] In some embodiments, the outside air intake module further includes an outside air pipe connecting the indoor and outdoor areas, the outside air pipe being drilled in a manner corresponding to an outdoor air inlet.

[0061] In some embodiments, the outside air pipe is drilled into a pipe mounting hole opened in the wall, one end of the outside air pipe faces inward and is connected to the outside air inlet of the outside air introduction module, and the other end of the outside air pipe faces outward and is provided with an air inlet, so that the outside air pipe communicates with the outside through the air inlet. Based on this mounting method, under the action of the outside air fan, outside air is drawn from the outside along the outside air pipe into the outside air introduction module inside the room, and blown out into the room from the outside air outlet, thereby realizing the introduction of outside air into the room.

[0062] In some embodiments, the indoor temperature sensor is installed at the indoor air inlet and configured to detect the indoor temperature.

[0063] In some embodiments, the indoor humidity sensor is installed at the indoor air inlet and configured to detect indoor humidity.

[0064] In some embodiments, the indoor temperature sensor and indoor humidity sensor may be integrated into a single temperature and humidity sensor. The temperature and humidity sensor detects the indoor temperature and humidity.

[0065] In some embodiments, the formaldehyde concentration sensor is installed at the heat exchange air outlet and is configured to detect the formaldehyde concentration in the room.

[0066] In some embodiments, the human body detection sensor is located in the casing 100 and is configured to detect whether or not a person is present in the room.

[0067] In some embodiments, the human body detection sensor may use an infrared human body detection sensor to detect whether or not a person is present in the room.

[0068] In some embodiments, the indoor heat exchanger further includes an internal guide plate and an external guide plate.

[0069] In some embodiments, the internal air guide plate is provided at the heat exchange air outlet and is located inside the casing 100.

[0070] In some embodiments, the external air guide plate is provided at the heat exchange air outlet of the air conditioning indoor unit, and the heat exchange air outlet communicates with the indoor air inlet.

[0071] In some embodiments, the operation of a heat exchange fan causes indoor air to enter the casing 100 from the indoor air inlet, pass through the indoor heat exchanger, and then be discharged into the indoor space through the heat exchange air outlet.

[0072] In some embodiments, when the indoor air conditioning unit is a cabinet-type indoor air conditioning unit, the internal air guide plate can reciprocate up and down, allowing for vertical swing airflow of indoor air. The external air guide plate can rotate left and right, allowing for swing airflow of indoor air.

[0073] In some embodiments, when the indoor air conditioning unit is a hanging type, the internal air guide plate can swing back and forth from side to side, allowing the indoor air to be blown in a swing direction. The external air guide plate can rotate up and down, allowing the indoor air to be blown in a swing direction.

[0074] Referring to Figures 4 to 8, in some embodiments, the controller, after receiving a command to activate the formaldehyde removal mode (which means activating the formaldehyde removal function to release formaldehyde from furniture and interior furnishings in the space where the air conditioning indoor unit is located into the air and to discharge the formaldehyde-containing indoor air to the outside), controls the indoor temperature sensor and indoor humidity sensor to detect the indoor temperature and humidity in real time, and controls the formaldehyde concentration sensor to detect changes in the indoor formaldehyde concentration in real time. Subsequently, the formaldehyde removal cycle is performed.

[0075] In some embodiments, when the formaldehyde removal mode is activated, the controller controls the air conditioner to perform multiple formaldehyde removal cycles, thereby improving formaldehyde removal efficiency.

[0076] In some embodiments, a single formaldehyde removal cycle includes some or all of the following: when the formaldehyde removal mode is activated (S401), and when the human body detection sensor detects the presence of a person in the room (S402), and at this time the indoor heat exchanger of the air conditioner indoor unit is operating as an evaporator (S403), the controller controls the air conditioner and issues an alarm (S404). This notifies the user that the formaldehyde removal mode can only be activated under heating mode. In other words, it informs the user that the formaldehyde removal mode can only be activated when the indoor heat exchanger is operating as a condenser.

[0077] In some embodiments, as shown in Figure 5, when the formaldehyde removal mode is activated (S501), and the human body detection sensor detects the presence of a person in the room (S502), and the indoor heat exchanger of the air conditioner indoor unit is operating as a condenser at this time (S503), the indoor temperature currently set on the air conditioner indoor unit is defined as the first temperature, and the controller is set to the first humidity corresponding to this first temperature. At this time, the indoor temperature control command of the air conditioner due to the formaldehyde removal mode is suppressed, and the controller operates the air conditioner at the indoor temperature currently set by the user (S504). In other words, at this time, the controller operates with the indoor temperature currently set by the user as the highest priority.

[0078] Simultaneously or after a predetermined period of time, the controller controls the system to determine whether the current indoor humidity is lower than the first humidity level (S505).

[0079] In some embodiments, when the indoor humidity sensor detects that the indoor humidity is equal to or greater than a first humidity level (S508), the controller is configured to perform some or all of the following operations: Operation 1 controls the humidifier to maintain its current operating state, and Operation 2 controls the outdoor fan to operate in forward rotation at a first power level lower than the upper limit of the rated power range.

[0080] As one specific embodiment, in the operation flow shown in Figure 6, if the indoor humidity is equal to or greater than the first humidity level, the controller is configured to control the humidifier to maintain its current operating state and to control the outdoor fan to rotate in the forward direction at a first power level lower than the upper limit of the rated power range (S509).

[0081] When the indoor humidity is above the first humidity level, it indicates that the indoor humidity has reached the optimal level for the release of formaldehyde from furniture and interior furnishings. The controller then maintains the humidifier in its current operating state, thereby maintaining a high-humidity environment indoors. This high-humidity environment improves the release of formaldehyde from furniture into the air and prevents discomfort to the user due to rising temperatures.

[0082] By operating the outdoor fan at a medium speed using the first power setting, it is possible to prevent large fluctuations in indoor temperature differences caused by excessive intake of outside air when the outdoor temperature is low, thereby preventing discomfort to the human body.

[0083] In some embodiments, when the indoor humidity sensor detects that the indoor humidity is lower than the first humidity (S506), it controls the humidifier to operate at a second power level lower than the upper limit of the rated power range (S507).

[0084] If the indoor humidity is lower than the first humidity level, it indicates that the current indoor humidity level has not reached the optimal level for the release of formaldehyde from furniture and interior furnishings. The controller then controls the humidifier to operate at a second power level, lower than the upper limit of the rated power range, thereby raising the indoor humidity to the first humidity level. This increases the release of formaldehyde from furniture into the air and maintains the temperature at the first temperature, preventing discomfort to the user due to rising temperatures.

[0085] Furthermore, the first humidity is not a fixed value but a variable value, and the air conditioner has a built-in first humidity that is appropriate for different first temperatures. Under the conditions of the first temperature and the first humidity corresponding to that temperature, it is possible to improve the formaldehyde release rate without causing discomfort to the human body, and it is also possible to maximize the formaldehyde release rate.

[0086] After receiving a command to activate the formaldehyde removal mode, the controller continues to operate with the user's currently set temperature as the highest priority, thereby avoiding any unpleasant effects on the user after the indoor temperature control is changed during dehumidification program operation.

[0087] In some embodiments, after the controller receives a command to activate the formaldehyde removal mode, if the inner and outer air guides are in a non-wind-free state at that time, the controller controls the system to maintain the motion of the inner and outer air guides, thereby reducing the resistance of the indoor air flowing out of the heat exchange air outlet and ensuring rapid circulation of the indoor air.

[0088] In some embodiments, when the inner and outer air guide plates are in a state that prevents direct blowing, they are maintained in the same state.

[0089] In some embodiments, when the inner and outer air guides are in a windless state, the controller adjusts them to a direct-blowing prevention state. When there is no wind, the inner and outer air guides partially block the air flowing out from the heat exchange air outlet. After adjustment, turbulence in the indoor air can be promoted, circulating the indoor air quickly, promoting the release of formaldehyde from furniture and interior furnishings, and preventing the heat exchange fan from rotating at a high speed and blowing directly onto the user, causing discomfort.

[0090] In some embodiments, when the presence of a person in a room is detected, the indoor temperature sensor and indoor humidity sensor detect changes in indoor temperature and humidity in real time, the compressor maintains its current operating state, and after the indoor humidity drops to a level lower than the first humidity level, the controller controls the humidifier to start up and humidify at a second power level lower than the upper limit of the humidifier's rated power range. By controlling the humidifier to operate at a low humidification power level, it is possible to avoid causing discomfort to the user due to rapid changes in indoor humidity, ensure that the indoor humidity reaches the first humidity level, and promote the release of formaldehyde from furniture and interior furnishings.

[0091] In some embodiments, when the formaldehyde removal mode is activated (S701), and after the formaldehyde removal mode has been running for 1 hour, the indoor formaldehyde concentration is detected (S702). If the indoor formaldehyde concentration detected by the formaldehyde concentration sensor is lower than a second preset concentration (S703), the controller is configured to perform some or all of the following operations: Operation 1 is to control the system to stop the outside air fan; Operation 2 is to control the system to stop the humidifier; and Operation 3 is to control the system to maintain the compressor and heat exchange fan in their current operating state. At this point, one formaldehyde removal cycle is completed.

[0092] As one specific example, in the operation flow shown in Figure 7, if the indoor formaldehyde concentration is lower than a second preset concentration, the controller is configured to stop the operation of the outside air fan, stop the operation of the humidifier, and maintain the compressor and heat exchange fan in their current operating state (S704).

[0093] After the first hour has elapsed, the indoor formaldehyde concentration is detected. If the indoor formaldehyde concentration is lower than the second preset concentration, it means that the indoor formaldehyde concentration is low and does not pose a risk to human health. At this time, the operation of the outdoor fan and humidifier is controlled to stop, thereby saving energy consumption during the operation of the air conditioning indoor unit. The compressor and heat exchange fan are controlled to maintain their current operating state, thus avoiding the problem of excessive energy consumption due to frequent changes in the compressor's operating frequency.

[0094] The first hour can be set to any value within the interval of 1 to 2 hours, for example, 1 hour, 1.2 hours, 1.5 hours, 1.75 hours, 2 hours, etc. Under the condition that the optimal temperature and humidity environment for the human body indoors is around 25°C and the relative humidity is around 50%, the time it takes for the outside air fan to replace the indoor air once is set to approximately 1.5 hours.

[0095] In some embodiments, after a first time has elapsed, when the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is equal to or greater than a second preset concentration (S705), the controller controls the outdoor fan, humidifier, compressor, and heat exchange fan to operate in the first preset time while maintaining their current state, and then performs some or all of the following operations. Specifically, operation 1 controls the outdoor fan to stop operating, operation 2 controls the humidifier to stop operating, and operation 3 controls the compressor and heat exchange fan to maintain their current operating state. At this point, one formaldehyde removal cycle is completed.

[0096] As one specific example, in the operation flow shown in Figure 8, if the indoor formaldehyde concentration is equal to or greater than the second preset concentration, the controller controls the outdoor fan, humidifier, compressor, and heat exchange fan to maintain their current state and operate for the first preset time, then controls the outdoor fan to stop operation, controls the humidifier to stop operation, and controls the compressor and heat exchange fan to maintain their current operating state (S706).

[0097] If, after the first hour has elapsed, the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is equal to or greater than the second preset concentration, it indicates that the indoor formaldehyde concentration at this time is still above the safe level. The system controls the outdoor fan, humidifier, compressor, and heat exchange fan to maintain their current state and continue operating for the first preset time, thereby promoting the release of formaldehyde from the room and the exhaust of indoor formaldehyde to the outside.

[0098] Firstly, after a preset time has elapsed, the indoor formaldehyde concentration decreases further, and by controlling the operation of the outdoor fan and humidifier to stop at this time, energy consumption during operation of the air conditioning indoor unit can be saved. Secondly, by controlling the compressor and heat exchange fan to maintain their current operating state, the problem of excessive energy consumption due to frequent changes in the compressor's operating frequency can be avoided.

[0099] Referring to Figures 9 to 20, in some embodiments, a formaldehyde removal cycle includes some or all of the following: When the formaldehyde removal mode is activated (S901), and the human body detection sensor detects that there is no person in the room (S902), the controller determines whether the indoor heat exchanger has become a condenser (S903). If the indoor heat exchanger of the air conditioning indoor unit is operating as a condenser, the controller controls the indoor temperature sensor to detect the indoor temperature and the indoor humidity sensor to detect the indoor humidity (S904). The controller determines whether the indoor temperature is lower than a first preset temperature and whether the indoor humidity is lower than a first preset humidity.

[0100] 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 equal to or greater than a first preset humidity (S905), the operating frequency of the compressor is controlled to increase (S906).

[0101] The controller increases the heat exchange rate of the indoor heat exchanger by controlling the compressor frequency, thereby increasing the indoor temperature as the indoor air is heated by the indoor heat exchanger as it passes through it, and the heated indoor air flows into the room through the heat exchange air outlet. This high temperature and high humidity indoor environment can further promote the release of formaldehyde from indoor furniture.

[0102] 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 (S907), the controller is configured to perform some or all of the following operations: Operation 1 is to control the compressor to increase its operating frequency, and Operation 2 is to control the humidifier to start up.

[0103] As one specific example, in the operation flow shown in Figure 10, if the room temperature is lower than a first preset temperature and the room humidity is lower than a first preset humidity, the controller is configured to increase the operating frequency of the compressor and control the humidifier to start up (S908).

[0104] The controller increases the amount of heat exchanged in the indoor heat exchanger by controlling the compressor frequency, thereby increasing the indoor temperature as the indoor air is heated by the indoor heat exchanger as it passes through it, and the heated indoor air flows into the room through the heat exchange air outlet.

[0105] By controlling the system to activate the humidifier when the indoor humidity is lower than a first preset humidity level, the indoor humidity increases, improving the release of formaldehyde from indoor furniture into the air in a high-humidity indoor environment. Furthermore, by increasing the compressor frequency and raising the indoor temperature, the high-temperature, high-humidity indoor environment can further promote the release of formaldehyde from indoor furniture.

[0106] In some embodiments, when the indoor temperature sensor detects that the indoor temperature is above a first preset temperature and the indoor humidity sensor detects that the indoor humidity is below a first preset humidity (S909), the controller is configured to perform some or all of the following operations: Operation 1 is to control the indoor heat exchanger to maintain the current heating state without changing the operating frequency of the compressor so that the indoor temperature is above a first preset temperature, and Operation 2 is to control the humidifier to start up.

[0107] As one specific example, in the operation flow shown in Figure 11, if the room temperature is above a first preset temperature and the room humidity is below a first preset humidity, the controller is configured to control the compressor so that its operating frequency does not change and to activate the humidifier (S910).

[0108] The controller increases indoor humidity by activating the humidifier, and this high-humidity indoor environment can improve the release of formaldehyde from indoor furniture into the air. Furthermore, by raising the indoor temperature in conjunction with heating the indoor heat exchanger, the high-temperature, high-humidity indoor environment can further promote the release of formaldehyde from indoor furniture.

[0109] In some embodiments, when the indoor temperature sensor detects that the indoor temperature is above a first preset temperature and the indoor humidity sensor detects that the indoor humidity is above a first preset humidity (S911), the controller is configured to perform some or all of the following operations: Operation 1 is to control the compressor so that its operating frequency does not change; Operation 2 is to control the indoor heat exchanger to maintain its current heating state so that the indoor temperature is above a first preset temperature and to avoid increased energy consumption due to changes in the compressor's operating frequency; Operation 3 is to control the humidifier so that its operating state does not change; and Operation 4 is to control the heat exchange fan to operate at the upper limit of its rated power range.

[0110] As one specific embodiment, in the operation flow shown in Figure 12, if the indoor temperature is above a first preset temperature and the indoor humidity is above a first preset humidity, the controller is configured to control the compressor so that its operating frequency does not change, the indoor heat exchanger so that it maintains its current heating state, the humidifier so that its operating state does not change, and the heat exchange fan so that it operates at the upper limit of its rated power range (S912).

[0111] The controller increases indoor humidity by activating the humidifier, and this high-humidity indoor environment can improve the release of formaldehyde from indoor furniture into the air. Furthermore, by raising the indoor temperature in conjunction with heating the indoor heat exchanger, the high-temperature, high-humidity indoor environment can further promote the release of formaldehyde from indoor furniture.

[0112] Controlling the heat exchange fan to operate at the upper limit of its rated power range, if the compressor's operating frequency remains constant, promotes the flow of indoor air, improves heat exchange between the indoor air and the indoor heat exchanger, further promotes the rise in indoor temperature, and causes the indoor air to continue to heat up.

[0113] In some embodiments, a formaldehyde removal cycle includes some or all of the following: when the formaldehyde removal mode is activated (S1301), and when the human body detection sensor detects that there is no person in the room (S1302), it is determined whether the indoor heat exchanger is operating as a condenser (S1303). If the indoor heat exchanger of the air conditioning indoor unit is operating as an evaporator, i.e., the controller determines that the indoor heat exchanger is not operating as a condenser, it controls the indoor heat exchanger to switch to operating as a condenser (S1304). The inner and outer air guide plates are rotated to their respective first positions. Both the inner and outer air guide plates rotate between their corresponding first and second positions. The second position indicates that the air guide plate is closed, and the first position indicates that the air guide plate is fully open. At this position, the air guide plate rotates to a position where the direction of gas flow at the air outlet is parallel to the air guide vanes, i.e., the minimum wind-blocking position (S1305). Simultaneously or after a certain period of time, the controller determines whether the indoor temperature is lower than a first preset temperature and whether the indoor humidity is lower than a first preset humidity. Based on the determination results between the indoor temperature and the first preset temperature, and between the indoor humidity and the first preset humidity, the controller is configured to perform the corresponding operations described above, which are omitted from this explanation.

[0114] By controlling the rotation of the inner and outer air guide plates to their corresponding first positions, which are minimum wind-blocking positions, the resistance to indoor air flowing out from the heat exchange air outlet is reduced, improving the disruptive effect of the air conditioner on indoor air. This is also advantageous when the air conditioner heats the indoor air as it passes through the indoor heat exchanger, raising the indoor temperature and releasing formaldehyde from indoor furniture into the air.

[0115] In some embodiments, when the formaldehyde removal mode is activated, the human body detection sensor detects that there are no people in the room, and the indoor heat exchanger operates as a condenser. When the indoor temperature sensor detects that the indoor temperature is above a first preset temperature, and the indoor humidity sensor detects that the indoor humidity is above a first preset humidity, the compressor's operating frequency is controlled to remain unchanged, the humidifier's operating state is controlled to remain unchanged, and the heat exchange fan is controlled to operate at the upper limit of its rated power range, thereby maintaining a high temperature and high humidity indoor environment and promoting the continued release of formaldehyde from furniture and interior furnishings into the air.

[0116] Secondly, after a preset time has elapsed (S1306), if the formaldehyde concentration in the room is high at this time, the outside air fan is controlled to reverse operation at the upper limit of the rated power range, and the high concentration of formaldehyde in the room is discharged to the outside (S1307).

[0117] By operating the outdoor fan in reverse at high speed at the upper limit of its rated power range, it can efficiently remove formaldehyde from the room by rapidly expelling it to the outside, compared to when the outdoor fan rotates in the forward direction. In this case, since there are no people in the room, there is no need to consider the discomfort to users caused by large fluctuations in indoor temperature due to the rapid expulsion of indoor air to the outside.

[0118] In some embodiments, the outside air fan is controlled to operate in a third preset time-reversal mode at the upper limit of the rated power range, then the formaldehyde concentration sensor is controlled to detect the formaldehyde concentration in the room, and it is determined whether or not the formaldehyde concentration in the room is lower than a second preset concentration (S1308).

[0119] If the indoor formaldehyde concentration is detected to be lower than a second preset concentration, the controller is configured to perform some or all of the following operations: Operation 1 is to control the operation of the outside air fan and / or humidifier to stop, and Operation 2 is to control the compressor and / or heat exchange fan to maintain their current operating state. At this point, one formaldehyde removal cycle is completed.

[0120] As one specific example, in the operation flow shown in Figure 20, if the controller detects that the indoor formaldehyde concentration is lower than a second preset concentration, the controller controls the operation of the outside air fan and humidifier to stop, and controls the operation of the compressor and heat exchange fan to maintain their current operating state (S1309).

[0121] After the outdoor fan has rotated in reverse for a third preset time, the indoor formaldehyde concentration decreases further. By controlling the system to stop the operation of the outdoor fan and humidifier at this time, energy consumption during operation of the air conditioning indoor unit can be saved. Furthermore, by controlling the compressor and heat exchange fan to maintain their current operating state, the problem of excessive energy consumption due to frequent changes in the compressor's operating frequency can be avoided.

[0122] In some embodiments, the third preset time may be set to any value in the range of 0.5 to 2 hours, for example, 0.5 hours, 0.8 hours, 1 hour, 1.5 hours, 2 hours, etc.

[0123] If the indoor formaldehyde concentration is detected to be equal to or higher than the second preset concentration, the controller controls the outdoor fan to continue operating for the fourth preset time so that the outdoor fan continues to expel formaldehyde from the indoor air to the outside. After the outdoor fan has continued operating for the fourth preset time, the indoor formaldehyde concentration will have decreased further, and the controller is configured to perform some or all of the following operations: Operation 1 is to control the operation of the outdoor fan and / or humidifier to stop, and Operation 2 is to control the compressor and / or heat exchange fan to maintain their current operating state. At this point, one formaldehyde removal cycle is completed.

[0124] As one specific example, in the operation flow shown in Figure 20, if the controller detects that the indoor formaldehyde concentration is equal to or greater than the second preset concentration, it controls the operation of the outside air fan and humidifier to stop after the fourth preset time has elapsed, and controls the operation of the compressor and heat exchange fan to maintain their current operating state (S1310).

[0125] In some embodiments, the compressor is operated at maximum heating power, which is represented, for example, by the sum of the heat pump input power and the electric heating input power. The heat exchange fan is also operated at the upper limit of its rated power.

[0126] After the outdoor fan has been operating in reverse for a preset period of time, the indoor formaldehyde concentration will decrease further. By controlling the operation of the outdoor fan and humidifier to stop at this time, energy consumption during the operation of the air conditioning indoor unit can be saved. Furthermore, by controlling the compressor and heat exchange fan to maintain their current operating state, the problem of excessive energy consumption due to frequent changes in the compressor's operating frequency can be avoided.

[0127] In some embodiments, the next formaldehyde removal cycle is initiated immediately after the completion of one formaldehyde removal cycle, or after a certain period of time has elapsed.

[0128] In some embodiments, when the formaldehyde removal mode is operating, the human body detection sensor detects that a user has returned to the house, and when the state changes from one where no one is in the room to one where someone is present, the controller controls the compressor and humidifier to switch back to the operating state before the formaldehyde removal mode was activated, controls the heat exchange fan to operate at the upper limit of its rated power range, and / or controls the outdoor fan to operate at the upper limit of its rated power range.

[0129] The controller controls the compressor and humidifier to switch to the operating state before the formaldehyde removal mode is activated, in order to ensure that the indoor humidity and temperature are at a temperature and humidity suitable for the user.

[0130] The controller controls the heat exchange fan to operate at the upper limit of its rated power range, and also controls the outdoor fan to operate at the upper limit of its rated power range. By doing so, both the rotation speed of the heat exchange fan and the outdoor fan are maintained at their maximum speeds, and the inner and outer air guide plates are switched to their wind-blocking positions. This reduces the indoor formaldehyde concentration to below the second preset concentration as quickly as possible, thus preventing the indoor formaldehyde from harming the indoor users.

[0131] In some embodiments, when the indoor formaldehyde concentration is lower than a second preset concentration, the operating power of the heat exchange fan and / or the outside air fan is controlled to be reduced, thereby saving energy consumption during the operation of the air conditioning indoor unit.

[0132] In some embodiments, if the indoor formaldehyde concentration is not lower than the second preset concentration, user commands are blocked and the controller does not perform any function. When the indoor formaldehyde concentration falls below the second preset concentration, the controller responds to user commands. If the indoor formaldehyde concentration is not lower than the second preset concentration, and the user performs an interference operation, the controller will notify the user via voice prompt or intelligent software that they need to wait until the indoor formaldehyde concentration falls below the second preset concentration before performing the operation.

[0133] In some embodiments, when the formaldehyde removal mode is in operation, if the human body detection sensor detects that there are no people in the room and the controller receives a command to terminate the formaldehyde removal mode, the controller is configured to perform some or all of the following operations: Operation 1 is to control the heat exchange fan to operate at a low speed with a third power lower than the upper limit of its rated power; Operation 2 is to control the compressor to operate at a low frequency with a fourth power lower than the upper limit of its rated power, thereby reducing the heat exchange capacity of the indoor heat exchanger and further lowering the indoor temperature to a temperature suitable for the user; Operation 3 is to control the outside air fan to operate at high speed in the reverse direction to discharge any formaldehyde remaining in the room to the outside.

[0134] In some embodiments, the controller may be configured to activate the dehumidification mode. When the indoor humidity drops to a second preset humidity level, dehumidification is stopped and the operating mode of the indoor heat exchanger is switched to a windless mode. The second preset humidity level is lower than the first preset humidity level.

[0135] In some embodiments, when the air conditioner operates in dehumidification mode (i.e., activating the dehumidification function of the air conditioner to reduce indoor humidity), the air conditioner uses the compressor, outdoor heat exchanger, expansion valve, and indoor heat exchanger to perform the dehumidification cycle of the indoor unit of the air conditioner.

[0136] The dehumidification cycle involves a series of processes including compression, condensation, expansion, and evaporation, supplying a refrigerant to conditioned and heat-exchanged air, and thereby regulating the humidity of the indoor space by supplying cool air to the indoor space through the refrigerant's heat absorption process.

[0137] The compressor compresses the refrigerant gas in a low-temperature, low-pressure state and discharges the refrigerant gas in a high-temperature, high-pressure state, which is then fed into the outdoor heat exchanger. The outdoor heat exchanger condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0138] The expansion valve expands the high-temperature, high-pressure liquid phase refrigerant, which has condensed in the outdoor heat exchanger, into a low-pressure liquid phase refrigerant.

[0139] The indoor heat exchanger evaporates the refrigerant that has expanded in the expansion valve, returning the refrigerant gas in a low-temperature, low-pressure state to the compressor. The indoor heat exchanger achieves a cooling effect by utilizing the latent heat of vaporization of the refrigerant to exchange heat with the indoor air.

[0140] Throughout the entire dehumidification cycle, the indoor unit of the air conditioner can reduce indoor humidity by condensing moisture in the indoor air into condensate.

[0141] In some embodiments, when the formaldehyde removal mode is in operation, if a human body detection sensor detects the presence of a person in the room and the controller receives a command to terminate the formaldehyde removal mode, the controller is configured to perform some or all of the following operations: Operation 1 is to control the heat exchange fan to operate at a low speed with a third power lower than the upper limit of its rated power; Operation 2 is to control the compressor to operate at a low frequency with a fourth power lower than the upper limit of its rated power, thereby reducing the heat exchange capacity of the indoor heat exchanger and further lowering the indoor temperature to a temperature suitable for the user; Operation 3 is to control the outdoor fan to operate at a medium speed in the forward direction with a first power lower than the upper limit of its rated power, thereby exhausting the formaldehyde remaining in the room to the outside.

[0142] By switching the outside air fan to forward-direction medium-speed operation, a large amount of outside air is quickly introduced, preventing a significant impact on the heat load of the indoor space and thus preventing discomfort to the human body.

[0143] In some embodiments, the controller may be configured to activate a dehumidification mode and adjust the indoor humidity to the most comfortable humidity value corresponding to the user's set temperature. The most comfortable humidity value is defined as the second humidity.

[0144] In some embodiments, a second humidity level corresponding to various pre-set temperatures may be configured within the controller.

[0145] In some embodiments, the dehumidification mode is controlled to stop after the indoor humidity reaches a second humidity level, and the heat exchanger's operating mode is switched to a draft-free mode to avoid discomfort caused by the direct airflow from the air conditioner to the user.

[0146] When the compressor is stopped, if the user activates the formaldehyde removal mode, the controller receives the command to activate the formaldehyde removal mode. The controller then controls the indoor air conditioning unit to start the air conditioner before activating the formaldehyde removal mode and notifies the user. This prevents the formaldehyde removal mode from being activated independently and ensures the normal operation of the formaldehyde removal mode.

[0147] In some embodiments, a display sticker may be provided on the control panel of the casing 100, or when a user independently activates the formaldehyde removal function on the control software corresponding to the indoor air conditioning unit, the control software may pop up and display appropriate display information.

[0148] In some embodiments, the displayed information may be set to "Please start the air conditioner first," thereby informing the user that the air conditioner must be started first in order to properly operate the formaldehyde removal mode.

[0149] As shown in Figures 1, 2A-2C, 3A-3C, and 4-20, in some embodiments, the indoor unit of the air conditioner is further provided with a formaldehyde removal module configured to remove formaldehyde from the indoor air.

[0150] In some embodiments, the method by which the formaldehyde removal module removes formaldehyde from indoor air includes, but is not limited to, technical means such as physical adsorption (e.g., adsorption materials such as activated carbon), chemical bonding (e.g., potassium permanganate chemical reaction), and catalytic oxidation (e.g., photocatalyst, room temperature catalyst, high temperature catalyst).

[0151] In some embodiments, the air conditioner is equipped with a formaldehyde removal mode. When the formaldehyde removal mode is activated, if a human body detection sensor detects that a person is present in the room, the air conditioner controls the system to activate the formaldehyde removal mode so that the indoor air passes through it. If the human body detection sensor detects that no person is present in the room, the air conditioner controls the system to stop the formaldehyde removal module so that the indoor air does not pass through it, thereby improving the lifespan of the formaldehyde removal module.

[0152] In this case, if the indoor heat exchanger of the air conditioner's indoor unit is operating as an evaporator, the controller will control the air conditioner as instructed and inform the user that the formaldehyde removal mode can only be activated in heating mode. In other words, the controller will inform the user that the formaldehyde removal mode can only be activated when the indoor heat exchanger is operating as a condenser.

[0153] In some embodiments, a formaldehyde removal cycle includes some or all of the following: When the formaldehyde removal mode is activated, if a human body detection sensor detects the presence of a person in the room, the formaldehyde removal module is activated so that the indoor air passes through the formaldehyde removal module, thereby improving the formaldehyde removal effect.

[0154] At this time, if the indoor heat exchanger of the air conditioner's indoor unit is operating as a condenser, the current indoor temperature installed in the air conditioner's indoor unit is defined as the first temperature, and the controller is set to the first humidity corresponding to the first temperature. At this time, the indoor temperature control command of the air conditioner due to formaldehyde removal mode is suppressed, and the controller operates with the currently set indoor temperature as the highest priority.

[0155] Simultaneously, or after a predetermined period of time, the controller controls the system to determine whether the current indoor humidity is lower than the first humidity level.

[0156] If the indoor humidity sensor detects that the indoor humidity is equal to or higher than the 1st humidity level, it controls the humidifier to maintain its current operating state and controls the outdoor fan to operate in forward rotation at a 1st power level lower than the upper limit of its rated power range.

[0157] When the indoor humidity sensor detects that the indoor humidity is lower than the first humidity level, it controls the humidifier to operate at a second power level, which is lower than the upper limit of the rated power range.

[0158] After receiving a command to activate the formaldehyde removal mode, the controller continues to operate with the user's currently set temperature as the highest priority, thereby avoiding any unpleasant effects on the user after the indoor temperature control is changed during dehumidification program operation.

[0159] In some embodiments, when the formaldehyde removal mode is activated, after the formaldehyde removal mode has been running for 1 hour, the indoor formaldehyde concentration is detected. If the indoor formaldehyde concentration detected by the formaldehyde concentration sensor is lower than a second preset concentration, the controller is configured to perform some or all of the following operations: Operation 1 is to control the outdoor fan to stop, Operation 2 is to control the humidifier to stop, and Operation 3 is to control the compressor and / or heat exchange fan to maintain their current operating state. At this point, one formaldehyde removal cycle is completed.

[0160] In some embodiments, after a first time has elapsed, if the formaldehyde concentration sensor detects that the indoor formaldehyde concentration is equal to or greater than a second preset concentration, the controller controls the outdoor fan, humidifier, compressor, and heat exchange fan to operate in their current state for the first preset time, and then performs some or all of the following operations: Operation 1 controls the outdoor fan to stop operating, Operation 2 controls the humidifier to stop operating, and Operation 3 controls the compressor and / or heat exchange fan to maintain their current operating state. At this point, one formaldehyde removal cycle is completed.

[0161] The following describes the operation flow in detail using a specific example, with a hanging-type air conditioner as the example.

[0162] As shown in Figures 1, 2A to 2C, 21 and 28, in some embodiments, the hanging air conditioner includes an indoor air conditioner unit, an air conditioner fan, an indoor heat exchanger 600, an air guide plate, an outdoor fan, and a controller. The indoor air conditioner unit includes a casing 100, the casing 100 having an air conditioning air inlet 101 and an air conditioning air outlet 102. The air conditioner fan is located inside the casing 100 and is configured to deliver conditioned air into the room via the air conditioning air outlet 102. The air guide plate is located at the air conditioning air outlet 102 and rotates to adjust the direction of the conditioned air passing through the air conditioning air outlet 102.

[0163] Based on the structure of the aforementioned hanging-type air conditioner, the controller is further configured as follows: When the formaldehyde removal mode is entered (S2101), the controller enters the first stage, controlling the indoor heat exchanger to be used as a condenser so that the indoor temperature reaches a second preset temperature. After the first time has elapsed, the controller enters the second stage (S2102), controlling the indoor heat exchanger to be used as an evaporator. After the second time has elapsed, the controller enters the third stage (S2103), controlling the indoor heat exchanger to be used as a condenser and simultaneously starting the outside air fan (S2104).

[0164] In this embodiment, in the first stage, the temperature is raised to accelerate the release of formaldehyde from the room, and in the second stage, the temperature is lowered to generate condensation water on the indoor heat exchanger 600, thereby dissolving the formaldehyde in the air into the condensation water. In the third stage, the temperature is raised to evaporate the condensation water containing dissolved formaldehyde, and an outside air fan is activated to discharge the condensed water outside. This eliminates the need to separately install an adsorption module to remove formaldehyde, thus saving costs.

[0165] In some embodiments, the second preset temperature and the first preset temperature may be the same value, or they may be specifically set according to the actual needs.

[0166] In some embodiments, as shown in Figure 28, a compressor 300 is provided inside the air conditioning outdoor unit 200, and the compressor 300 is configured to send refrigerant to the outdoor heat exchanger 500 or the indoor heat exchanger 600.

[0167] As shown in Figures 23 and 28, in some embodiments, the controller is configured to control the vertical oscillation of the air guide plate in the first stage. In the first stage, the air guide plate is directed downwards to promote the flow of indoor air and rapidly raise the temperature of the room.

[0168] In some embodiments, the hanging air conditioner further includes an outdoor air conditioning unit 200, an outdoor heat exchanger 500, an expansion member 700, and an indoor temperature sensor, wherein the outdoor air conditioning unit 200 is hung outdoors, and the outdoor heat exchanger 500 is installed inside the outdoor air conditioning unit 200. The expansion member 700 is used to control the refrigerant pressure and temperature between the outdoor heat exchanger 500 and the indoor heat exchanger 600. The indoor temperature sensor is installed at the air conditioning air inlet 101 to acquire the indoor temperature value.

[0169] In some embodiments, the controller is configured to increase the frequency of the compressor 300 in the first stage if the room temperature has not reached a second preset temperature. By ensuring that the room temperature reaches the second preset temperature in the first stage, more formaldehyde can be dissolved in the condensate in the subsequent second stage.

[0170] As shown in Figure 23, in some embodiments, the controller is configured in the first stage to detect the indoor temperature value using an indoor temperature sensor and compare it with a second preset temperature. If the indoor temperature value is lower than the second preset temperature, the incremental frequency is increased to the current operating frequency of the compressor 300. If the indoor temperature value is equal to or greater than the second preset temperature, the compressor operates in that state. The above operation is repeated at each first detection time.

[0171] In some embodiments, a coil temperature sensor is provided within the casing 100, and the coil temperature sensor is configured to detect the temperature of the indoor heat exchanger 600 in order to obtain the coil temperature value of the indoor heat exchanger 600. In the first stage, the controller obtains the coil temperature value of the indoor heat exchanger 600 (hereinafter referred to as "indoor coil temperature value"), calculates the temperature value that the indoor heat exchanger 600 should reach when the room reaches a second preset temperature, compares this temperature value with the indoor coil temperature value, and increases the increment frequency of the current operating frequency of the compressor 300 if it is lower than the temperature value that the indoor heat exchanger should reach when the room reaches the second preset temperature. If it is higher than the temperature value that the indoor heat exchanger should reach when the room reaches the second preset temperature, it maintains this state and continues to operate. The above operation is repeated at each first detection time.

[0172] As shown in Figures 22 to 24, in some embodiments, the controller is configured to enter a first transition stage after the completion of the first stage, and in the first transition stage, to enter the second stage after reducing the frequency of the compressor 300 and maintaining the first transition time. In the present invention, a first transition stage is provided between the first and second stages, which allows the indoor heat exchanger to smoothly switch from the condenser state to the evaporator operating state. Since it is necessary to switch from the heating mode of the first stage to the cooling mode of the second stage, the frequency of the compressor 300 is reduced in the first transition stage to ensure smooth switching of the four-way valve.

[0173] In some embodiments, the compressor 300 has a first frequency and a second frequency, the first frequency being greater than the second frequency. The controller is configured to control the compressor 300 to operate at the first frequency in a first stage and to operate at the second frequency in a first transition stage.

[0174] As shown in Figures 24 to 26, in some embodiments, the controller is configured in the second stage to calculate the current return air dew point temperature difference if the indoor coil temperature is greater than a third preset temperature, and to increase the opening of the expansion member if the indoor coil temperature is less than or equal to the third preset temperature. In this embodiment, when calculating the return air dew point temperature difference, it is first determined whether the indoor coil temperature is greater than the third preset temperature, and based on the result of this determination, the temperature of the indoor heat exchanger is adjusted to ensure that condensation water can be generated on the indoor heat exchanger.

[0175] In some embodiments, the controller is configured to, in the second stage, control a coil temperature sensor to obtain the indoor coil temperature value, compare the indoor coil temperature value with a third preset temperature, and increase the opening of the expansion member if the indoor coil temperature value is less than or equal to the third preset temperature. If the indoor coil temperature value is greater than the third preset temperature, the controller calculates the current return air dew point temperature difference, and if the current return air dew point temperature difference is less than a preset return air dew point temperature difference, it controls the opening of the expansion member 700 to decrease. If the current return air dew point temperature difference is greater than or equal to a preset return air dew point temperature difference, the current operating state is maintained. The above operation is repeated at each second detection time.

[0176] In some examples, the current return air dew point temperature difference is calculated by subtracting the temperature of the indoor heat exchanger from the return air dew point temperature. The formula for calculating the return air dew point temperature is as follows:

number

[0177] In some embodiments, the return air dew point temperature difference is automatically calculated by computer software, or the value is calculated and returned via the cloud.

[0178] In some embodiments, the expansion member 700 is an expansion valve.

[0179] As shown in Figures 23 to 26, in some embodiments, the controller is configured to control horizontal airflow in the second stage. In these embodiments, the horizontal airflow of the guide plate in the second stage creates a good airflow structure in the room, and a large amount of formaldehyde in the room is dissolved by the condensation water on the indoor heat exchanger 600.

[0180] In some embodiments, in the second stage, the rotational speed of the air conditioner fan is lower than the rotational speed in the first stage and the first transition stage.

[0181] In some embodiments, the air conditioner fan includes a first air conditioner rotation speed, a second air conditioner rotation speed, and a third air conditioner rotation speed. Both the first air conditioner rotation speed and the second air conditioner rotation speed are greater than the third air conditioner rotation speed.

[0182] In some embodiments, the rotational speed of the first air conditioner and the rotational speed of the second air conditioner may be the same.

[0183] The controller controls the air conditioner fan to operate at a first air conditioner rotation speed in the first stage, controls the air conditioner fan to operate at a second air conditioner rotation speed in the first transition stage, and controls the air conditioner fan to operate at a third air conditioner rotation speed in the third stage.

[0184] In some embodiments, in the initial state of the second stage, the indoor coil temperature is at least 1°C higher than the third preset temperature.

[0185] As shown in Figures 23 to 26, in some embodiments, the controller is configured to enter a second transition stage after the completion of the second stage, reduce the frequency of the compressor 300 in the second transition stage, maintain the second transition time, and then enter the third stage. In this application, a second transition stage is provided between the second and third stages, allowing the indoor heat exchanger to smoothly switch from the evaporator state to the condenser operating state. Since it is necessary to switch from the cooling mode of the second stage to the heating mode of the third stage, the frequency of the compressor 300 is reduced in the second transition stage to ensure smooth switching of the four-way valve.

[0186] In some embodiments, the compressor 300 further has a third frequency and a fourth frequency. The fourth frequency may be lower than the third frequency, and the third frequency may be the same as the first frequency.

[0187] In some embodiments, during the second transition stage, the air conditioner fan operates at the third air conditioner rotation speed.

[0188] In some embodiments, the controller is configured to increase the frequency of the compressor 300 if the indoor coil temperature value has not reached a fourth preset temperature in the third stage. In this embodiment, it is ensured that the coil temperature value of the indoor heat exchanger 600 reaches a fourth preset temperature in the third stage, and that the condensation water on the indoor heat exchanger 600 evaporates.

[0189] As shown in Figure 27, in some embodiments, the controller is configured to detect the coil temperature value of the indoor heat exchanger (hereinafter referred to as the indoor coil temperature value) by a coil temperature sensor in the third stage and compare it with a fourth preset temperature. If the indoor coil temperature value is lower than the fourth preset temperature, the incremental frequency is increased to the current operating frequency of the compressor. If the indoor coil temperature value is equal to or greater than the fourth preset temperature, the compressor operates in that state. The above operation is repeated at each third detection time.

[0190] In some embodiments, the controller is configured to stop the air conditioner fan in the third stage. In this case, there is no need to raise the room temperature, and it is sufficient to heat and evaporate the condensed water in the indoor heat exchanger, so the air conditioner fan is not started. Furthermore, by stopping the air conditioner fan, the airflow is prevented from passing through the indoor heat exchanger and carrying away the heat from the indoor heat exchanger, allowing the indoor heat exchanger to heat up quickly, improve the evaporation effect, and increase efficiency.

[0191] In some embodiments, the fourth preset temperature should be set so that it can evaporate the condensed water.

[0192] In some embodiments, to improve efficiency, the fourth preset temperature is the maximum value that the indoor heat exchanger can reach.

[0193] In some embodiments, the present invention makes it possible to condense condensed water in the indoor heat exchanger if the current return air dew point temperature difference in the second stage is greater than or equal to a preset return air dew point temperature difference.

[0194] As shown in Figure 28, in some embodiments, the compressor 300 has two connection ends, which are connected to an indoor heat exchanger 600 and an outdoor heat exchanger 500, respectively. The ends of the outdoor heat exchanger 500 and the indoor heat exchanger 600 that are away from the compressor 300 are connected to each other and communicate via an expansion member.

[0195] In some embodiments, the expansion member 700 is provided between the indoor heat exchanger 600 and the outdoor heat exchanger 500, and the expansion member 700 adjusts the pressure and temperature of the refrigerant in the outdoor heat exchanger 500 and the indoor heat exchanger 600. A four-way valve 400 is provided between the compressor 300 and the outdoor heat exchanger 500, or between the compressor 300 and the indoor heat exchanger 600, and the four-way valve 400 adjusts the flow direction of the refrigerant to enable switching between heating mode and cooling mode.

[0196] In some embodiments, when the indoor heat exchanger 600 is used as a condenser, the outdoor heat exchanger 500 is used as an evaporator. The refrigerant is output from the compressor 300, dissipates heat in the indoor heat exchanger 600, enters the outdoor heat exchanger 500, absorbs heat in the outdoor heat exchanger 500, and then circulates back to the compressor 300. By adjusting the opening of the expansion member 700, the refrigerant pressure and temperature characteristics in the indoor heat exchanger 600 and the outdoor heat exchanger 500 can be adjusted to increase or decrease the heating effect.

[0197] In some embodiments, when the indoor heat exchanger 600 is used as an evaporator, the outdoor heat exchanger 500 is used as a condenser. In this case, the air conditioner is in cooling mode, and the refrigerant output from the compressor 300 enters the outdoor heat exchanger 500 to dissipate heat. The refrigerant that has passed through the outdoor heat exchanger 500 returns to the compressor 300 via the expansion member 700 and the indoor heat exchanger 600. By adjusting the opening of the expansion member 700, the refrigerant pressure and temperature characteristics in the indoor heat exchanger 600 and the outdoor heat exchanger 500 can be adjusted to increase or decrease the cooling effect.

[0198] As shown in Figure 28, in some embodiments, the air conditioning air inlet 101 is located at the top of the casing 100. The airflow enters the interior of the casing 100 through the top air conditioning air inlet 101. An indoor temperature sensor is installed at the air conditioning air inlet 101, and the indoor temperature value detected by the air conditioner's indoor temperature sensor is also the return air temperature value of the air conditioner.

[0199] In some embodiments, an outdoor fan is installed inside the air conditioning outdoor unit, and the outdoor fan is configured to blow air onto the outdoor heat exchanger 500 to achieve heat exchange of the refrigerant. In the first stage, first transition stage, second stage, second transition stage and third stage, the outdoor fan operates based on a recommended rotational speed calculated by the system.

[0200] In some embodiments, the recommended rotational speed may include multiple rotational speeds, any one rotational speed may be selected from multiple rotational speeds, or the maximum rotational speed may be selected from multiple rotational speeds; the present application is not specifically limited.

[0201] In some embodiments, the rotational speed of the first air conditioner fan is greater than the rotational speed of the third air conditioner fan, and the rotational speed of the second air conditioner fan is greater than the rotational speed of the third air conditioner fan.

[0202] Referring to Figure 27, to summarize the above, in this embodiment, after entering the formaldehyde removal mode, the controller enters the first stage, and the controller performs some or all of the following operations. Specifically, operation 1 is to control the indoor heat exchanger 600 to be used as a condenser so that the indoor temperature reaches a second preset temperature, operation 2 is to control the air guide plate to blow air downwards, operation 3 is to control the air conditioner fan to operate at a first air conditioner rotation speed, and operation 4 is to control the compressor 300 to operate at a first frequency.

[0203] The indoor temperature sensor detects the indoor temperature and compares it to a second preset temperature. If the indoor temperature is lower than the second preset temperature, the increment frequency is increased to the current operating frequency of the compressor 300. If the indoor temperature is equal to or greater than the second preset temperature, the compressor continues to operate in that state. The above operation is repeated at each first detection time.

[0204] The first stage enters the first transition stage after the first time has elapsed, and in the first transition stage, the controller is configured to perform some or all of the following operations: Operation 1 is to control the air conditioner fan to operate at the second air conditioner rotation speed, and Operation 2 is to control the compressor 300 to operate at the second frequency to maintain the first transition time, and then enter the second stage.

[0205] In the second stage, the controller is configured to perform some or all of the following operations: Operation 1 is to control the indoor heat exchanger 600 to be used as an evaporator; Operation 2 is to control the air guide plate to blow air horizontally; Operation 3 is to control the air conditioner fan to operate at the third air conditioner rotation speed; and Operation 4 is to control the compressor 300 to operate at the third frequency.

[0206] The coil temperature sensor is controlled to obtain the indoor coil temperature value, and this value is compared with a third preset temperature. If the indoor coil temperature value is less than or equal to the third preset temperature, the opening of the expansion member is increased. If the indoor coil temperature value is greater than the third preset temperature, the current return air dew point temperature difference is calculated, and if the current return air dew point temperature difference is less than a preset return air dew point temperature difference, the opening of the expansion member 700 is controlled to decrease. If the current return air dew point temperature difference is greater than or equal to a preset return air dew point temperature difference, the current operating state is maintained. The above operation is repeated every second detection time.

[0207] After the second stage has elapsed for two hours, the system enters the second transition stage, during which the controller is configured to perform some or all of the following operations: Operation 1 is to control the air conditioner fan to operate at the third air conditioner rotation speed, and Operation 2 is to control the compressor 300 to operate at the fourth frequency to maintain the second transition time before entering the third stage.

[0208] In the third stage, the indoor heat exchanger 600 is controlled to be used as a condenser, and simultaneously or after a certain period of time, the outside air fan is started and the air conditioner fan is stopped.

[0209] The coil temperature sensor detects the indoor coil temperature and compares it to a fourth preset temperature. If the indoor coil temperature is lower than the fourth preset temperature, the increment frequency is increased to the current operating frequency of the compressor 300. If the indoor coil temperature is equal to or greater than the fourth preset temperature, the compressor continues to operate in that state. The above operation is repeated at the third detection time interval.

[0210] After the third stage continues for three hours, unless the user stops the formaldehyde removal mode, the system will re-enter the first stage and recycle before the user exits the formaldehyde removal mode.

[0211] The first, second, and third time intervals, the first transition time, the second transition time, the first detection time, the second detection time, and the third detection time can all be set as needed and can be changed according to the room area, user settings, heat exchange efficiency, etc.

[0212] In some feasible embodiments, referring to the operation flow shown in Figure 21 followed by Figure 22, the controller is configured as follows: After the first stage (S2102) is completed, the first transition stage is entered, the air conditioner fan is controlled to operate at the second air conditioner rotation speed, and the compressor is operated at the second frequency to maintain the first transition time (S2102'), and after one hour has elapsed since entering the first stage, the system moves to the second stage (S2103). After the second stage is completed, the system moves to the second transition stage, the air conditioner fan is controlled to operate at the third air conditioner rotation speed, and the compressor is operated at the fourth frequency to maintain the second transition time (S2103'), and after two hours have elapsed since entering the second stage, the system moves to the third stage (S2104).

[0213] In several feasible embodiments, the controller is configured as follows, as shown in Figure 23. Specifically, it enters formaldehyde removal mode (S2301), enters the first stage, and uses the indoor heat exchanger as a condenser to raise the indoor temperature to a second predetermined temperature. It controls the air guide plate to blow downwards, operates the air conditioner fan at a first air conditioner rotation speed, and operates the compressor at a first frequency (S2302). It determines whether the first time has elapsed (S2303), and if No, it continues operation while maintaining the current state (S2304). If Yes, it enters the second stage, controls the indoor heat exchanger to be used as an evaporator, controls the air guide plate to blow air horizontally, operates the air conditioner fan at a third air conditioner rotation speed, and operates the compressor at a third frequency (S2305). It determines whether the second time has elapsed (S2306), and if No, it continues operation while maintaining the current state (S2307). If the answer is Yes, the process enters the third stage, where the indoor heat exchanger is used as a condenser, the outside air fan is started, and the air conditioner fan is stopped (S2308). It is then determined whether or not the third time has elapsed (S2309). If the answer is No, the current state is maintained and operation continues (S2310). If the answer is Yes, the process ends.

[0214] In some feasible embodiments, referring to Figure 23 followed by Figure 24, the controller is configured as follows: After confirming that the first time has elapsed (S2303), the controller enters the first transition stage, in which the air conditioner fan is controlled to operate at the second air conditioner rotation speed and the compressor is operated at the second frequency to maintain the first transition time (S2102'), and then the controller moves to the second stage (S2305). After confirming that the second time has elapsed (S2306), the controller enters the second transition stage, the air conditioner fan is controlled to operate at the third air conditioner rotation speed and the compressor is operated at the fourth frequency to maintain the second transition time (S2103'), and then the controller moves to the third stage.

[0215] In some feasible embodiments, referring to Figure 24 followed by Figure 25, the controller is configured as follows: In the second stage, the indoor heat exchanger is used as an evaporator, the air guide plate is controlled to blow air horizontally, the air conditioner fan is operated at the third air conditioner rotation speed, and the compressor is operated at the third frequency (S2305). After that, it is determined whether the indoor coil temperature value is greater than the third preset temperature value (S2401). If yes, it is determined whether the current return air dew point temperature difference is less than the preset return air dew point temperature difference (S2402). If no, the opening of the expansion member is increased (S2403), and it is determined whether the second time has elapsed (S2306). If it is determined that the current return air dew point temperature difference is less than the preset return air dew point temperature difference, the opening of the expansion member is decreased (S2404), and it is determined whether the second time has elapsed (S2306). If the current return air dew point temperature difference is determined to be equal to or greater than a preset return air dew point temperature difference, the operation continues while maintaining the current state (S2405), and it is determined whether or not the second time has elapsed (S2306). After confirming that the second time has elapsed, the process moves to the second transition stage (S2103'), and if it is determined that the second time has not elapsed and the second detection time has elapsed (S2406), the process returns to step S2401.

[0216] In some feasible embodiments, as shown in Figure 26, the controller is configured as follows: It enters formaldehyde removal mode (S2601), enters the first stage, uses the indoor heat exchanger as a condenser, controls the air guide plate to blow downwards, operates the air conditioner fan at the first air conditioner speed, and controls the compressor to operate at the first frequency (S2602), and determines whether the indoor temperature is lower than the second preset temperature (S2603). If yes, it increases the increment frequency to the current compressor operating frequency (S2604), and after the first detection time has elapsed (S2605), it returns to step S2603. If no, it maintains the current state and continues operation (S2606), and determines whether the first time has elapsed (S2607). After confirming that the first time has elapsed, it enters the first transition stage, operates the air conditioner fan at the second air conditioner speed, and operates the compressor at the second frequency to maintain the first transition time (S2608). If it is determined that the first hour has not elapsed, the process returns to step S2603.

[0217] After step S2608 is performed, the second stage begins, in which the indoor heat exchanger is used as an evaporator, the air guide plate is controlled to blow air horizontally, the air conditioner fan is controlled to operate at the third air conditioner rotation speed, and the compressor is controlled to operate at the third frequency (S2609). It is determined whether the indoor coil temperature value is greater than the third preset temperature, and if yes, it is determined whether the current return air dew point temperature difference is less than the preset return air dew point temperature difference (S2611). If no, the opening of the expansion member is increased (S2614), and after the second detection time has elapsed (S2613), the process returns to step S2610. If it is determined that the current return air dew point temperature difference is less than the preset return air dew point temperature difference, the opening of the expansion member is decreased (S2612), and after the second detection time has elapsed (S2613), the process returns to step S2610. If the current return air dew point temperature difference is determined to be equal to or greater than the preset return air dew point temperature difference, the operation continues while maintaining the current state (S2615), and it is determined whether or not the second time has elapsed (S2616). After confirming that the second time has elapsed, the second transition stage is entered, and the air conditioner fan is operated at the third air conditioner rotation speed and the compressor is operated at the fourth frequency to maintain the second transition time (S2617). If it is determined that the second time has not elapsed, the process returns to step S2610.

[0218] After step S2617 is performed, the third stage begins, in which the indoor heat exchanger is used as a condenser, the outside air fan is started and the air conditioner fan is stopped (S2618). Then, it is determined whether the indoor coil temperature value is lower than the fourth preset temperature (S2619). If yes, the incremental frequency is increased to the current operating frequency of the compressor (S2620), and after the third detection time has elapsed (S2612), the process returns to step S2619. If no, the current state is maintained and operation continues (S2622), and it is determined whether the third time has elapsed (S2623). If no, the process returns to S2619. If yes, it is determined whether the user has stopped the formaldehyde removal mode (S2624). If it is determined that the user has stopped the formaldehyde removal mode, the process ends. If it is determined that the user has not stopped the formaldehyde removal mode, the process returns to step S2602.

[0219] In some executable embodiments, referring to Figure 26 followed by Figure 27, the controller is configured as follows: It determines whether the first time has elapsed (S2607), and if it is determined that the first time has not elapsed and the first detection time has elapsed (S2605), it returns to step S2603. After determining whether the second time has elapsed (S2616), if it is determined that the second time has not elapsed and the second detection time has elapsed (S2613), it returns to step S2610. After determining whether the third time has elapsed (S2623), if it is determined that the third time has not elapsed and the third detection time has elapsed (S2621), it returns to step S2619.

[0220] As shown in Figures 1, 2A, 2B, 2C, 29-30, in some embodiments, other hanging air conditioners include an indoor air conditioner, a first indoor heat exchanger 601, a second indoor heat exchanger 602, an air conditioner fan, an outdoor air conditioner 200, a compressor 300, a drain pipe, and a controller. The casing 100 included in the indoor air conditioner has an air conditioner outlet and an air conditioner inlet. The first indoor heat exchanger 601 is installed inside the casing 100, the second indoor heat exchanger 602 is installed between the first indoor heat exchanger 601 and the air conditioner inlet, and the air conditioner fan is installed inside the casing 100 and configured to deliver air through the second indoor heat exchanger 602 and then through the first indoor heat exchanger 601 to the room via the air conditioner outlet. The compressor 300, located inside the outdoor air conditioning unit 200 installed outside the building, is configured to supply refrigerant to the first indoor heat exchanger 601 and the second indoor heat exchanger 602. One end of the drain pipe communicates with the outside, and the other end is close to the second indoor heat exchanger 602.

[0221] The controller is configured to control the second indoor heat exchanger 602 as an evaporator to calculate the current return air dew point temperature difference, control the second indoor heat exchanger 602 so that the current return air dew point temperature difference is equal to or greater than a preset return air dew point temperature difference, and control the operation of the first indoor heat exchanger 601 so that the room reaches a preset indoor temperature value.

[0222] Based on the structure of the other hanging air conditioners described above, the second indoor heat exchanger 602 is controlled to function as an evaporator in order to lower its temperature, thereby generating condensed water on the surface of the second indoor heat exchanger 602, dissolving indoor formaldehyde in the condensed water, and discharging the condensed water outside the room via a drain pipe, thereby achieving a formaldehyde removal effect. In addition, the first indoor heat exchanger 601 is configured to regulate the temperature of the air that has passed through the second indoor heat exchanger 602, thereby avoiding the influence of the second indoor heat exchanger 602 on the indoor temperature and ensuring that the indoor temperature does not affect the user's thermal comfort.

[0223] In some embodiments, the other hanging air conditioner further includes a second expansion member 702 and a first expansion member 701, wherein the second expansion member 702 is configured to control the pressure and temperature of the refrigerant entering the second indoor heat exchanger 602, and the first expansion member 701 is configured to control the pressure and temperature of the refrigerant entering the first indoor heat exchanger 601. In this embodiment, the second expansion member 702 and the first expansion member 701 control the temperature of the second indoor heat exchanger 602 and the temperature of the first indoor heat exchanger 601, respectively.

[0224] In some embodiments, an outdoor heat exchanger 500 is further provided inside the air conditioning outdoor unit 200, and the compressor 300 has two connection terminals, which are connected to and communicate with the second indoor heat exchanger 602 and the outdoor heat exchanger 500, respectively. The first indoor heat exchanger 601 is provided between the second indoor heat exchanger 602 and the outdoor heat exchanger 500.

[0225] As shown in Figure 29, in some embodiments, the first expansion member 701 is provided between the first indoor heat exchanger 601 and the outdoor heat exchanger 500, and adjusts the temperature of the first indoor heat exchanger 601 by adjusting the pressure and temperature of the refrigerant between the outdoor heat exchanger 500 and the first indoor heat exchanger 601. The second expansion member 702 is provided between the first indoor heat exchanger 601 and the second indoor heat exchanger 602, and adjusts the temperature of the second indoor heat exchanger 602 by adjusting the pressure and temperature of the refrigerant between the first indoor heat exchanger 601 and the second indoor heat exchanger 602.

[0226] In some embodiments, a four-way valve 400 is provided between the compressor 300 and the outdoor heat exchanger 500, or between the compressor 300 and the second indoor heat exchanger 602, and the four-way valve 400 adjusts the direction of refrigerant flow, thereby enabling switching between heating mode and cooling mode.

[0227] In cooling mode, the compressor 300 sequentially passes the refrigerant through the outdoor heat exchanger 500, the first indoor heat exchanger 601, and the second indoor heat exchanger 602, before returning it to the compressor 300.

[0228] In heating mode, the compressor 300 outputs refrigerant, which passes sequentially through the second indoor heat exchanger 602, the first indoor heat exchanger 601, and the outdoor heat exchanger 500 before returning to the compressor 300.

[0229] In some embodiments, a coil temperature sensor is provided within the casing 100, and the coil temperature sensor is configured to detect the temperature of the second indoor heat exchanger 602 in order to obtain a second coil temperature value.

[0230] As shown in Figures 30 to 32, the controller is configured to control the indoor coil temperature sensor to acquire the second coil temperature value, determine the relationship between the second coil temperature value and a preset coil temperature value, and if the second coil temperature value is lower than the preset coil temperature value, control the controller to increase the opening of the second expansion member 702 in order to increase the pressure and temperature of the refrigerant passing through the second indoor heat exchanger 602. Since a lower second coil temperature value means that the temperature of the second indoor heat exchanger 602 is low, the second expansion member 702 increases the pressure and temperature of the refrigerant passing through the second indoor heat exchanger 602, ensuring that formaldehyde does not undergo polymerization and thus ensuring the effectiveness of formaldehyde removal.

[0231] In some embodiments, the controller is configured to increase the amount of the second opening based on the current opening of the second expansion member 702 when the second coil temperature value is less than a preset coil temperature value.

[0232] In some embodiments, the second opening increment is greater than zero. The specific numerical value of the second opening increment is selected as needed.

[0233] In some embodiments, the controller is configured to calculate the current return air dew point temperature difference when the second coil temperature value is greater than a preset coil temperature value, and to control the opening of the second expansion member 702 to be smaller when the current return air dew point temperature difference is smaller than a preset return air dew point temperature difference, thereby reducing the pressure and temperature of the refrigerant passing through the second indoor heat exchanger 602. By adjusting the temperature of the second indoor heat exchanger 602, condensed water can be generated in the second indoor heat exchanger 602, thereby ensuring the formaldehyde removal effect.

[0234] As shown in Figures 30 to 35, in some embodiments, the controller is configured to reduce the amount of the second opening based on the current opening of the second expansion member 702 when the current return air dew point temperature difference is smaller than a preset return air dew point temperature difference.

[0235] In some embodiments, the reduction in the second opening is greater than zero. The specific numerical value of the reduction in the second opening is selected as needed.

[0236] In some embodiments, the current return air dew point temperature difference is obtained by subtracting the temperature of the second indoor heat exchanger 602 from the return air dew point temperature. The method for determining the return air dew point temperature can be found in the previously mentioned section and will not be explained again here.

[0237] In this embodiment, if the current return air dew point temperature difference is smaller than a preset return air dew point temperature difference, it means that the current temperature of the second indoor heat exchanger 602 is high. Therefore, the second expansion member 702 is controlled to lower the pressure and temperature of the refrigerant passing through the second indoor heat exchanger 602 in order to lower the temperature of the second indoor heat exchanger 602.

[0238] In some embodiments, the controller is configured to maintain the current state and continue operating if the current return air dew point temperature difference is greater than a preset return air dew point temperature difference.

[0239] In some embodiments, the controller is configured to determine the relationship between the second coil temperature value and a preset coil temperature value at each first detection time. In this embodiment, by re-detecting at each first detection time, it is ensured that the temperature of the second indoor heat exchanger 602 is within an accurate range in real time.

[0240] In some embodiments, the controller is configured to determine whether the first indoor heat exchanger 601 is within an appropriate temperature range so that the room reaches a preset indoor temperature when the second coil temperature is greater than a preset coil temperature and the current return air dew point temperature difference is greater than a preset return air dew point temperature difference.

[0241] In some embodiments, the controller is configured to determine whether the first indoor heat exchanger 601 is within an appropriate temperature range so that the room reaches a preset indoor temperature, provided that the second coil temperature value is greater than a preset coil temperature value and the current return air dew point temperature difference is greater than a preset return air dew point temperature difference, and this condition is maintained up to the fourth hour.

[0242] In some embodiments, the controller is configured to control the operation of the first indoor heat exchanger 601 while simultaneously controlling the operation of the second indoor heat exchanger 602 to use it as an evaporator, so that the room reaches a preset indoor temperature value.

[0243] As shown in Figures 30 to 35, in some embodiments, the other hanging air conditioner may be adjusted according to the season, and in summer the air conditioner may be controlled to enter a first mode of formaldehyde removal, in spring and autumn the air conditioner may be controlled to enter a second mode of formaldehyde removal, and in winter the air conditioner may be controlled to enter a third mode of formaldehyde removal. The main difference between the first, second, and third modes is that the preset coil temperature value and the preset room temperature value are different.

[0244] In some embodiments, the preset coil temperature value and the preset room temperature value are set according to the user's needs, selected according to cloud data, or set at the time of shipment of the air conditioner.

[0245] In some embodiments, the selection of whether to enter a first, second, or third mode of formaldehyde removal is based on the cloud sending a command or the controller detecting the current season.

[0246] In some embodiments, a return air temperature sensor is provided at the air conditioning air inlet, and the return air temperature sensor is configured to detect the indoor air and obtain a return air temperature value. The return air temperature value is the indoor temperature.

[0247] Referring to Figures 30 to 35, in some embodiments, the controller controls a return air temperature sensor to obtain a return air temperature value, determines the relationship between the return air temperature value and the first and second temperature values, controls the first expansion member 701 to increase the pressure and temperature of the refrigerant that has passed through the first indoor heat exchanger 601 if the return air temperature value is less than the first temperature value, and controls the first expansion member 701 to decrease the pressure and temperature of the refrigerant that has passed through the first indoor heat exchanger 601 if the return air temperature value is greater than the second temperature value. In this embodiment, when the return air temperature is less than the first temperature value, the temperature of the first indoor heat exchanger 601 is increased by adjusting the first expansion member 701, and when the return air temperature is greater than the second temperature value, the temperature of the first indoor heat exchanger 601 is decreased by adjusting the first expansion member 701.

[0248] In some embodiments, if the return air temperature is lower than the first temperature, the amount of increase in the first opening is increased based on the current opening of the first expansion member 701.

[0249] In some embodiments, the first opening increment is greater than zero. A specific numerical value for the first opening increment is selected as needed.

[0250] In some embodiments, if the return air temperature is greater than the second temperature, the first opening degree reduction is subtracted based on the current opening degree of the first expansion member 701.

[0251] In some embodiments, the first opening angle reduction is greater than zero. A specific numerical value for the first opening angle reduction is selected as needed.

[0252] In some embodiments, if the return air temperature is greater than the first temperature value and less than the second temperature value, the system is operated while maintaining the current state.

[0253] In some embodiments, the preset indoor temperature is between a first temperature value and a second temperature value. The first temperature value and the second temperature value are adjusted according to the adjustment of the preset indoor temperature value, or the first temperature value and the second temperature value are preset according to the user's needs, or are selected according to cloud data, or are preset at the time of shipment of the air conditioner.

[0254] In some embodiments, changing the temperature of the first indoor heat exchanger 601 by adjusting the first expansion member 701 operates in a first mode of formaldehyde removal.

[0255] As shown in FIGS. 30 to 35, in some embodiments, the controller controls the return air temperature sensor to obtain a return air temperature value. When the return air temperature value is smaller than the first temperature value, the controller controls the compressor 300 to increase the increment frequency to the current operating frequency. When the return air temperature value is larger than the second temperature value, the controller controls the compressor 300 to subtract the decrement frequency from the current operating frequency. In this embodiment, when the return air temperature is smaller than the first temperature value, the temperature of the first indoor heat exchanger 601 is increased by adjusting the compressor 300. When the return air temperature is larger than the second temperature value, the temperature of the first indoor heat exchanger 601 is decreased by adjusting the compressor 300.

[0256] In some embodiments, the increment frequency and the decrement frequency are selected as needed. Both the increment frequency and the decrement frequency are greater than zero.

[0257] In some embodiments, the solution of changing the temperature of the first indoor heat exchanger 601 by adjusting the frequency of the compressor 300 operates in a second mode of formaldehyde removal.

[0258] In some embodiments, the solution of changing the temperature of the first indoor heat exchanger 601 by adjusting the frequency of the compressor 300 operates in a third mode of formaldehyde removal.

[0259] In some embodiments, the specific numerical value of the incremental frequency is preset according to the needs of the user, or selected according to cloud data, or preset at the time of shipment of the air conditioner.

[0260] In some embodiments, the controller is configured to determine the relationship between the return air temperature value and the first temperature value and the second temperature value every second detection time. To ensure that the temperature of the first indoor heat exchanger 601 is within an accurate range, it is detected and adjusted whether the first indoor heat exchanger 601 reaches a preset temperature every second detection time.

[0261] In some embodiments, the air conditioner fan has a first rotational speed and a second rotational speed, and the first rotational speed is greater than the second rotational speed.

[0262] Referring to FIGS. 30 to 35, before controlling the second indoor heat exchanger 602 to be used as an evaporator, the controller is configured to control the air conditioner fan to operate at the first rotational speed for the first duration, and then control the air conditioner fan to operate at the second rotational speed. By this method, indoor formaldehyde is evenly distributed in the indoor air, the latent heat ratio in the heat exchange amount is increased, the heat exchange effect is improved, and the formaldehyde removal effect is enhanced.

[0263] In some embodiments, after entering the formaldehyde removal mode, the controller is configured to control the air conditioner fan to operate at the first rotational speed for the first duration, then control the air conditioner fan to operate at the second rotational speed for the second duration, and then control the second indoor heat exchanger 602 to be used as an evaporator.

[0264] In some embodiments, the return air temperature value is between the first temperature value and the second temperature value and reaches the fifth hour. It is determined whether the user has stopped the formaldehyde removal mode. If yes, the formaldehyde removal mode is stopped; if no, the current formaldehyde removal mode is restarted.

[0265] In some embodiments, the first and second rotation speeds are preset according to user needs, selected according to cloud data, or preset at the time of shipment of the air conditioner.

[0266] In some embodiments, an outdoor fan is installed inside the air conditioning outdoor unit 200, and the outdoor fan is configured to blow airflow onto the outdoor heat exchanger 500 to achieve heat exchange of the refrigerant inside the outdoor heat exchanger 500.

[0267] In some embodiments, the outdoor fan has a first outdoor rotation speed, a second outdoor rotation speed, and a third outdoor rotation speed. In the first mode of formaldehyde removal, the outdoor fan is operated at the first outdoor rotation speed. In the second mode of formaldehyde removal, the outdoor fan is operated at the second outdoor rotation speed. In the third mode of formaldehyde removal, the outdoor fan is operated at the third outdoor rotation speed.

[0268] In some embodiments, the first outdoor rotation speed is greater than the second outdoor rotation speed and greater than the third outdoor rotation speed.

[0269] In some embodiments, the first outdoor rotation speed, the second outdoor rotation speed, and the third outdoor rotation speed are selected according to the actual needs.

[0270] In some embodiments, the compressor 300 has a first frequency, a second frequency, and a third frequency. The initial frequency of the compressor 300 in the first mode of formaldehyde removal is the first frequency. The initial frequency of the compressor 300 in the second mode of formaldehyde removal is the second frequency. The initial frequency of the compressor 300 in the third mode of formaldehyde removal is the third frequency.

[0271] In some embodiments, the second frequency is smaller than the third frequency.

[0272] In some embodiments, the first expansion member 701 is a first expansion valve, which has a first opening and a second opening. The first opening is the fully open position, and the second opening is smaller than the first opening, with the second opening being selected according to the actual needs.

[0273] In the first mode of formaldehyde removal, the initial opening of the first expansion valve is set to the second opening. In the second and third modes of formaldehyde removal, the initial opening of the first expansion valve is set to the first opening.

[0274] In some embodiments, the second expansion member 702 is a second expansion valve, and the second expansion valve has a third, fourth, and fifth opening that decreases sequentially.

[0275] In the first mode of formaldehyde removal, the initial opening of the second expansion valve is set to the third opening. In the second mode of formaldehyde removal, the initial opening of the second expansion valve is set to the fourth opening. In the third mode of formaldehyde removal, the initial opening of the second expansion valve is set to the fifth opening.

[0276] In some feasible embodiments, as shown in Figure 30, the controller is configured as follows: Enter formaldehyde removal mode (S3001), use the indoor heat exchanger as an evaporator, control the indoor coil temperature sensor to obtain the second coil temperature value (S3002), determine whether the second coil temperature value is smaller than a preset coil temperature value (S3003), if yes, increase the temperature of the second indoor heat exchanger (S3004), return to step S3003, if no, determine whether the current return air dew point temperature difference is smaller than a preset return air dew point temperature difference (S3005), if yes, decrease the temperature of the second indoor heat exchanger (S3006), return to step S3003, if no, maintain the current state and continue operation (S3007), and control the return air temperature sensor to obtain the return air temperature value (S3008). The system determines whether the return air temperature is lower than the first temperature (S3009). If yes, the temperature of the first indoor heat exchanger is increased (S3010), and the system returns to step S3009. If no, the system determines whether the return air temperature is higher than the second temperature (S3011). If yes, the temperature of the first indoor heat exchanger is decreased (S3012), and the system returns to step S3009. If no, the system operates while maintaining the current state (S3013).

[0277] In some feasible embodiments, referring to Figure 31 following Figure 30, the controller is configured as follows: After entering formaldehyde removal mode (S3001), the second indoor heat exchanger is used as an evaporator, and before controlling the indoor coil temperature sensor to obtain the second coil temperature value (S3002), the air conditioner fan is controlled to operate at the first rotation speed for the first duration, and then at the second rotation speed (S3101). After operating while maintaining the current state (S3007), it is determined whether the fourth time has elapsed (S3102). If yes, the return air temperature sensor is controlled to obtain the return air temperature value (S3008). If no, it is determined whether the second coil temperature value is smaller than a preset coil temperature value (S3003). After operating while maintaining the current state (S3013), it is determined whether the fifth time has elapsed (S3103). If yes, the process ends, and if no, the operation continues while maintaining the current state (S3013).

[0278] In some feasible embodiments, referring to Figure 30 followed by Figure 32, the controller is configured as follows: After entering formaldehyde removal mode (S3001), the second indoor heat exchanger is used as an evaporator, and before controlling the indoor coil temperature sensor to obtain the second coil temperature value (S3002), the air conditioner fan is controlled to operate at a first rotation speed for a first duration, and then at a second rotation speed (S3101). After increasing the temperature of the second indoor heat exchanger (S3004) and decreasing the temperature of the second indoor heat exchanger (S3006), and after the first detection time has elapsed (S3201), it is determined whether the second coil temperature value is smaller than a preset coil temperature value (S3003). After increasing the temperature of the first indoor heat exchanger (S3010) and then decreasing the temperature of the first indoor heat exchanger (S3012), and after the second detection time has elapsed (S3202), it is determined whether the return air temperature value is smaller than the first temperature value (S3009).

[0279] In some viable embodiments, the controller is configured as follows, as shown in Figure 33. That is, after entering the first mode of formaldehyde removal (S3301), the outdoor fan is operated at the first outdoor rotation speed, the compressor is operated at the first initial frequency, the initial opening of the first expansion valve is set to the second opening, and the initial opening of the second expansion valve is set to the third opening (S3302). The air conditioner fan is controlled to operate at the first rotation speed for a first duration, and then to operate at the second rotation speed (S3303). The second indoor heat exchanger is controlled to be used as an evaporator. The indoor coil temperature sensor is controlled to obtain the second coil temperature value (S3304). The system determines whether the second coil temperature value is smaller than a preset coil temperature value (S3305). If yes, it increases the second opening amount based on the current opening of the second expansion member (S3306). After the first detection time has elapsed (S3312), it returns to step S3305. If no, it determines whether the current return air dew point temperature difference is smaller than a preset return air dew point temperature difference (S3307). If yes, it decreases the second opening amount based on the current opening of the second expansion member (S3308). After the first detection time has elapsed (S3312), it returns to step S3305. If no, it operates while maintaining the current state (S3309). It then determines whether the fourth time has elapsed (S3310).

[0280] If Yes, control the return air temperature sensor to obtain the return air temperature value (S3311). If No, after the first detection time has elapsed (S3312), return to step S3305. After step S3311 is executed, determine whether the return air temperature value is less than the first temperature value (S3313). If Yes, increase the first opening degree increase amount based on the current opening degree of the first expansion member (S3314). After the second detection time has elapsed (S3317), return to step S3313. If No, determine whether the return air temperature value is greater than the second temperature value (S3315). If Yes, decrease the first opening degree decrease amount based on the current opening degree of the first expansion member (S3316). After the second detection time has elapsed (S3317), return to the execution of step S3313. If No, maintain the current state and operate (S3318), and determine whether the fifth time has elapsed (S3319). If No, when the second detection time has elapsed (S3317), return to step S3313. If Yes, determine whether the user has stopped the formaldehyde removal mode. If Yes, the process ends. If No, return to step S3302 and repeat the above process.

[0281] In some viable embodiments, the controller is configured as follows, as shown in Figure 34. That is, after entering the second mode of formaldehyde removal (S3401), the outdoor fan is operated at the second outdoor rotation speed, the compressor is operated at the second initial frequency, the initial opening of the first expansion valve is set to the first opening, and the initial opening of the second expansion valve is set to the fourth opening (S3402). The air conditioner fan is controlled to operate at the first rotation speed for a first duration, and then to operate at the second rotation speed (S3403). The second indoor heat exchanger is controlled to be used as an evaporator, and the indoor coil temperature sensor is controlled to obtain the second coil temperature value (S3404). The system determines whether the second coil temperature value is less than a preset coil temperature value (S3405). If yes, the second opening degree increase is increased based on the current opening degree of the second expansion member (S3406). After the first detection time has elapsed (S3407), the system returns to step S3405. If no, the system determines whether the current return air dew point temperature difference is less than a preset return air dew point temperature difference (S3408). If yes, the second opening degree decrease is decreased based on the current opening degree of the second expansion member (S3409). After the first detection time has elapsed (S3407), the system returns to step S3405. If no, the system operates while maintaining the current state (S3410), and controls the return air temperature sensor to obtain the return air temperature value (S3411).

[0282] It is determined whether the return air temperature is less than the first temperature (S3412). If yes, the temperature of the first indoor heat exchanger is increased (S3413), and after the second detection time has elapsed (S3416), the process returns to step S3412. If no, it is determined whether the return air temperature is greater than the second temperature (S3414). If yes, the temperature of the first indoor heat exchanger is decreased (S3415), and after the second detection time has elapsed (S3416), the process returns to step S3412. If no, the process continues to operate while maintaining the current state (S3417), and it is determined whether the user has stopped the formaldehyde removal mode (S3418). If yes, the process ends, and if no, the process returns to step S3402.

[0283] In some feasible embodiments, the controller is configured as follows, as shown in Figure 35. That is, after entering the third mode of formaldehyde removal (S3501), the outdoor fan is operated at the third outdoor rotation speed, the compressor is operated at the third initial frequency, the initial opening of the first expansion valve is set to the first opening, and the initial opening of the second expansion valve is set to the fifth opening (S3502). The air conditioner fan is controlled to operate at the first rotation speed for the first duration, and then at the second rotation speed (S3503). The second indoor heat exchanger is controlled to be used as an evaporator, and the indoor coil temperature sensor is controlled to obtain the second coil temperature value (S3504). The system determines whether the second coil temperature is smaller than a preset coil temperature (S3505). If yes, it increases the second opening amount based on the current opening of the second expansion member (S3506). After the first detection time has elapsed (S3507), it returns to step S3505. If no, it determines whether the current return air dew point temperature difference is smaller than a preset return air dew point temperature difference (S3508). If yes, it decreases the second opening amount based on the current opening of the second expansion member (S3509). After the first detection time has elapsed (S3507), it returns to step S3505. If no, it operates while maintaining the current state (S3510). The system determines whether the first time has elapsed (S3511). If it is determined that the first time has not elapsed and the first detection time has elapsed (S3507), the system returns to step S3505. If the first time has elapsed, the system controls the return air temperature sensor to obtain the return air temperature value (S3512).

[0284] It is determined whether the return air temperature value is less than the first temperature value (S3513). If yes, the compressor is controlled to increase the incremental frequency to the current operating frequency (S3514), and the process returns to step S3513. If no, it is determined whether the return air temperature value is greater than the second temperature value (S3515). If yes, the compressor is controlled to subtract the incremental frequency to the current operating frequency (S3516), and the process returns to step S3513. If no, the system operates while maintaining the current state (S3517), and it is determined whether the fifth time has elapsed (S3518). If it is determined that the fifth time has not elapsed and the second detection time has elapsed (S3520), the process returns to step S3513. If yes, it is determined whether the user has stopped the formaldehyde removal mode (S3519). If yes, the process ends, and if no, step S3502 is executed.

[0285] The following describes the operation flow in detail using a specific example, with a vertical (cabinet-type) air conditioner as the example.

[0286] As shown in Figures 3A to 3C, in some embodiments of the vertical (cabinet-type) air conditioner of the present invention, the vertical (cabinet-type) air conditioner includes an indoor air conditioner unit, an air conditioner fan, an indoor heat exchanger, an outdoor air fan, an indoor temperature sensor, a formaldehyde removal module (also called a formaldehyde removal component), an outdoor air conditioner unit, and a controller.

[0287] In some embodiments, when the indoor air conditioning unit is vertical or wall-mounted (not shown in Figures 3A to 3C) installed indoors, the indoor air conditioning unit has a front panel, and the casing 100 included in the indoor air conditioning unit has an air conditioning outlet and an outside air outlet. The air conditioning outlet and the outside air outlet are located on the front panel of the casing 100, spaced apart from each other, and the air conditioning fan is installed inside the casing 100 and configured to send conditioned air into the room via the air conditioning outlet. An air conditioning duct installed inside the casing 100 communicates with the air conditioning outlet, and the air conditioning fan communicates with the air conditioning duct. When the air conditioning fan is operating, it sends air through the air conditioning duct into the room via the air conditioning outlet. An indoor heat exchanger is installed on the intake side of the air conditioning fan to heat or cool the air and adjust the room temperature by changing the temperature of the conditioned air sent into the room.

[0288] The outside air fan is installed inside the casing 100, with one end of the outside air duct installed inside the indoor air conditioning unit communicating with the outside air outlet and the other end communicating with the outside. The outside air fan is configured to discharge indoor air to the outside by sending outside air from the outside air outlet through the outside air duct into the room, and the formaldehyde removal module is installed inside the air conditioning duct, and the formaldehyde inside the air conditioning air that has passed through the air conditioning duct is adsorbed by the formaldehyde removal module and then discharged into the room.

[0289] In some embodiments, the air conditioning outdoor unit is installed outdoors, and an outdoor temperature sensor is installed inside the air conditioning outdoor unit to detect the outdoor temperature. The air conditioner includes a compressor connected to an indoor heat exchanger, which changes its frequency to increase or decrease the flow rate of refrigerant in the indoor heat exchanger. This controls the refrigerant flow rate by the compressor, thereby changing the temperature of the indoor heat exchanger and changing the temperature of the conditioned air.

[0290] As shown in Figure 36, the controller determines whether the air conditioner has entered formaldehyde removal mode (S3601), the outdoor temperature sensor has detected the outdoor temperature (S3602), and the current outdoor temperature has reached a first preset outdoor temperature (S3603).

[0291] In some embodiments, after the current outdoor temperature reaches a first preset outdoor temperature, the process proceeds to step S3604 (details below). It is determined whether the outdoor temperature has reached a second preset outdoor temperature (S3605), and if the outdoor temperature is below the second preset outdoor temperature, the process proceeds to steps S3606 and S3607. The controller controls the indoor heat exchanger to perform a heating cycle to raise the indoor temperature to a first set temperature (S3606), causing formaldehyde to precipitate at a first rate, reducing the indoor-outdoor temperature difference and thus reducing energy consumption. The air conditioner fan draws in indoor air, adsorbs formaldehyde from the conditioned air via the formaldehyde removal module, and then sends it back into the room (S3607).

[0292] As shown in Figures 36 and 40, the air conditioner in this embodiment detects the outdoor temperature using an outdoor temperature sensor. When the outdoor temperature reaches a first preset outdoor temperature and is below a second preset outdoor temperature, the indoor heat exchanger is controlled to perform a heating cycle to bring the indoor temperature to the first set temperature. By adjusting the indoor temperature based on the outdoor temperature, the compressor avoids entering high-load operation, saving energy. Formaldehyde is precipitated at a first rate, and the temperature difference between the inside and outside is reduced, reducing energy consumption. The air conditioner fan draws in indoor air, adsorbs formaldehyde from the conditioned air via a formaldehyde removal module, and then sends it back into the room to complete formaldehyde removal, reducing the formaldehyde content in the indoor air, ensuring formaldehyde removal efficiency, and reducing energy consumption.

[0293] In some embodiments, an outdoor heat exchanger is provided inside the outdoor unit of the air conditioner. The outdoor heat exchanger is in communication with the indoor heat exchanger and the compressor. The compressor compresses the refrigerant and passes it through the indoor and outdoor heat exchangers, thereby increasing or decreasing the temperature of the conditioned air through evaporation or condensation in the outdoor and indoor heat exchangers. The power of the compressor is changed to alter the temperature of the conditioned air that has passed through the indoor heat exchanger.

[0294] In some embodiments, if the outdoor temperature has not reached a first preset outdoor temperature, the controller controls the air conditioner fan to enter a standby state. Since indoor temperature is inevitably proportional to outdoor temperature, a low outdoor temperature results in a low indoor temperature, which is unfavorable for the precipitation of formaldehyde from furniture and wood materials. Furthermore, when raising the indoor temperature, it is necessary to operate the compressor at high output to raise the indoor temperature as much as possible, resulting in high energy consumption. Therefore, in this solution, when the outdoor temperature is low, the indoor heat exchanger and air conditioner fan are not operated to avoid unnecessary energy consumption.

[0295] In some embodiments, the first preset outdoor temperature may be selected according to the application scenario, for example, the outdoor temperature is lower than the first preset outdoor temperature at night and higher than the first preset outdoor temperature during the day.

[0296] In some embodiments, the first preset outdoor temperature is 5°C or higher and 10°C or lower.

[0297] In some embodiments, a first preset outdoor temperature is set to 8°C, 9°C, 10°C, etc., based on the average temperature level in China.

[0298] In some embodiments, the second set temperature is between 20°C and 30°C.

[0299] As shown in Figure 39, in some embodiments, when the outdoor temperature reaches a first preset outdoor temperature and is below a second preset outdoor temperature, the first set temperature is the outdoor temperature plus a first increment temperature. The first increment temperature is between 5°C and 10°C. For example, if the outdoor temperature is 25°C and the first increment temperature is 8°C, the first set temperature is 25°C + 8°C = 33°C.

[0300] As shown in Figures 36 and 39, in some embodiments, the controller is configured as follows: When the outdoor temperature reaches a second preset outdoor temperature or higher, the process proceeds to steps S3608 and S3609, in which the controller controls the indoor heat exchanger to perform a heating cycle to raise the indoor temperature to a second set temperature (S3608), precipitates indoor formaldehyde at a second rate faster than the first rate, reduces the indoor-outdoor temperature difference, reduces energy consumption, and operates the outdoor fan to discharge indoor air containing formaldehyde to the outside (S3609).

[0301] In this embodiment, when the outdoor temperature exceeds the second preset outdoor temperature, the indoor temperature also inevitably rises, and the rate of formaldehyde deposition in indoor furniture or wood panels is rapid at this indoor temperature. At this time, the controller controls the indoor heat exchanger to perform a heating cycle to raise the indoor temperature to a second preset temperature, which is higher than the first preset temperature. When the outdoor temperature reaches the second preset outdoor temperature or higher, the indoor temperature reaches the already high baseline condition, so the compressor can raise the indoor temperature to the second preset temperature with only a small amount of additional power, thereby improving the formaldehyde removal effect, reducing the power load on the compressor as much as possible, and saving energy consumption. When the outdoor temperature reaches the second preset outdoor temperature or higher under these conditions, the indoor formaldehyde removal method switches to outside air circulation, and the indoor air containing formaldehyde is discharged to the outside. When the outdoor temperature reaches a second preset outdoor temperature or higher, it means that the outdoor temperature has already reached a high temperature. Even if outside air enters the room, it will not significantly affect the indoor temperature, and the rate of formaldehyde deposition can be guaranteed. Therefore, by using an outside air fan to send outside air into the room through the outside air outlet and exhausting the indoor airflow containing formaldehyde to the outside, not only is energy consumption reduced, but formaldehyde can also be thoroughly removed, ensuring human health.

[0302] In some embodiments, if the outdoor temperature reaches a second preset outdoor temperature or higher, the second set temperature is the outdoor temperature plus a second increment temperature, where the second increment temperature is between 5°C and 15°C. It should be noted that, to avoid dangers such as fire due to an excessively high second set temperature, the second set temperature is limited to a maximum of 50°C. That is, if the temperature obtained by adding the second increment temperature to the outdoor temperature exceeds 50°C, the second set temperature is 50°C.

[0303] As shown in Figures 37-39, 42-44, and 47-49, some embodiments further include an air guide plate and a drive member. The air guide plate is provided on the casing and positioned close to the air conditioning outlet and is configured to adjust the direction of the conditioned air passing through the air conditioning outlet. The drive member is configured to drive and rotate the air guide plate. When the outdoor temperature reaches a first preset outdoor temperature, the drive member is controlled to reciprocate the air guide plate and cause the conditioned air passing through the air conditioning outlet to swing back and forth (S3604). This promotes the flow of indoor air and can accelerate the deposition rate of formaldehyde.

[0304] In some embodiments, the drive member includes, but is not limited to, an electric motor. The drive member is housed within a casing, and its output shaft is connected to an air guide plate. A controller is electrically connected to the drive member, and when the air conditioner fan is started, the controller synchronizes the reciprocating rotation of the drive member's output shaft to realize the reciprocating motion of the air guide plate. The conditioned air guided by the air guide plate is blown into the room, increasing the airflow velocity around furniture and panels, and accelerating the rate at which formaldehyde precipitates from furniture and panels.

[0305] As shown in Figures 37-39, 42-44, and 47-49, in some embodiments, a humidifier is installed inside the casing and configured to increase the indoor humidity and accelerate the precipitation rate of formaldehyde. When the outdoor temperature reaches a first preset outdoor temperature, the humidifier operates to increase the indoor humidity (S3604) and further increase the precipitation rate of formaldehyde. The higher the ambient humidity in which formaldehyde is present, the higher the precipitation rate of formaldehyde. Therefore, when the air conditioner fan operates, the controller controls the humidifier to operate and humidify the room.

[0306] In some embodiments, a water tank is provided inside the casing, and the water tank is in communication with a humidifier. When the humidifier is started, the water in the water tank is atomized and supplied to the room.

[0307] As shown in Figures 37, 38, and 39, in some embodiments, a humidity detector is installed inside the casing to detect indoor humidity. The controller has a normal dehumidification setting value and a formaldehyde removal dehumidification setting value, with the formaldehyde removal dehumidification setting value being higher than the normal dehumidification setting value. After the air conditioner enters formaldehyde removal mode, the humidity detector detects the indoor humidity, and if the indoor humidity is higher than the formaldehyde removal dehumidification setting value, it enters dehumidification mode. After entering formaldehyde removal mode, the normal dehumidification setting value is replaced with this formaldehyde removal dehumidification setting value, so that even if the indoor humidity is high, the air conditioner does not enter dehumidification mode, allowing the indoor humidity to continue to rise, and increasing the indoor humidity can increase the rate of formaldehyde deposition.

[0308] In some embodiments, when the outdoor temperature reaches a first preset outdoor temperature, the humidifier is activated to bring the indoor humidity to a preset level. The preset humidity range is 90% to 99%. That is, after the humidifier is activated, it humidifies the room until the indoor humidity level is between 90% and 99%, increasing the indoor humidity level as much as possible to maximize the rate of formaldehyde deposition.

[0309] In some embodiments, a humidity detector is provided inside the casing to detect the humidity in the room. The controller sets a humidity hysteresis range and controls the humidifier to stop operating when the indoor humidity is within the humidity hysteresis range. The humidifier stops when the indoor humidity is within the humidity hysteresis range. In this embodiment, the humidity detector detects the humidity in the room. When the indoor humidity reaches a preset humidity level, the humidifier stops. However, after the humidifier stops, the indoor humidity constantly changes.

[0310] For example, assuming a preset humidity of 90%, the humidity detector will stop the humidifier when it detects that the indoor humidity has reached 90%. However, during the few seconds the humidifier is stopped, the indoor humidity will drop below 90%, at which point the humidifier will restart and humidify the room. After the humidifier has been running for a few seconds, the indoor humidity will reach 90% again, and the system will stop the humidifier, repeating the above process. Therefore, to avoid frequent switching of the humidifier on and off, a humidity hysteresis range is set. This humidity range is defined as the range obtained by adding a humidity hysteresis value to the preset humidity, rather than the preset humidity range.

[0311] In some embodiments, the humidity hysteresis value is between 5% and 10%. For example, if the preset humidity is 90% and the humidity hysteresis value is 5%, the humidity detector will turn off the humidifier and stop operating if it detects that the indoor humidity is between 90% and 95%.

[0312] In some embodiments, when an air conditioner fan draws in indoor air, adsorbs formaldehyde from the conditioned air via a formaldehyde removal module, and then sends the air back into the room (S3607), the power of the air conditioner fan has a positive correlation with the indoor temperature; that is, the higher the indoor temperature, the greater the power of the air conditioner fan. As the indoor temperature increases, the amount of formaldehyde in the air increases, so it is necessary to increase the airflow of the conditioned air to ensure that the formaldehyde is adsorbed by the formaldehyde removal module.

[0313] As shown in Figure 39, in some embodiments, when the air conditioner fan draws in indoor air, adsorbs formaldehyde from the conditioned air via a formaldehyde removal module, and then sends it back into the room (S3607), the rotational speed of the air conditioner fan is the air conditioner rotational speed level multiplied by the indoor temperature. The air conditioner rotational speed level is between 10 and 40, and the air conditioner rotational speed level is determined according to the actual situation.

[0314] For example, if the room temperature is 25°C and the air conditioner rotation speed level is 40, the rotation speed of the air conditioner fan is 25 × 40 = 1000 rpm. The rotation speed of the air conditioner fan is a minimum of 200 rpm and a maximum of 1200 rpm. Therefore, if the calculated rotation speed of the air conditioner fan is less than 200 rpm, it operates at 200 rpm, and if the calculated rotation speed of the air conditioner fan is greater than 1200 rpm, it operates at 1200 rpm. In this embodiment, the formaldehyde removal effect is ensured and energy consumption is reduced by adjusting the rotation speed of the air conditioner fan as needed.

[0315] In some embodiments, when an outside fan is operated to discharge indoor air containing formaldehyde to the outside (S3609), the power of the outside fan has a positive correlation with the indoor temperature; that is, the higher the indoor temperature, the higher the power of the outside fan. As the indoor temperature increases, the amount of formaldehyde in the air increases, so it is necessary to increase the airflow of outside air to ensure that formaldehyde is discharged.

[0316] In some embodiments, when an outside fan is operated to discharge indoor air containing formaldehyde to the outside (S3609), the rotational speed of the outside fan is calculated by multiplying the outside air rotational speed level by the indoor temperature. The outside air rotational speed level is between 8 and 30, and the outside air rotational speed level is determined according to the actual situation.

[0317] For example, if the indoor temperature is 40°C and the air conditioner rotation speed is set to level 20, the rotation speed of the air conditioner fan is 40 × 20 = 800 rpm. In this proposed technology, the formaldehyde removal effect is ensured while reducing energy consumption by adjusting the rotation speed of the outside air fan as needed.

[0318] As shown in Figure 41, the controller determines whether the air conditioner has entered formaldehyde removal mode (S3601), whether the outdoor temperature sensor has detected the outdoor temperature (S3602), and whether the current outdoor temperature has reached a first preset outdoor temperature (S3603). If the current outdoor temperature has reached the first preset outdoor temperature, the process proceeds to step S3604. The system determines whether the outdoor temperature has reached a second preset outdoor temperature (S3605). If the outdoor temperature has reached a first preset outdoor temperature and is below the second preset outdoor temperature, the system proceeds to steps S3606''' and S3607'''. The controller controls the indoor heat exchanger to perform a heating cycle to bring the indoor temperature to a first set temperature based on the current energy saving level (S3606'''), causing formaldehyde to precipitate at a first rate. The air conditioner fan draws in indoor air, adsorbs formaldehyde from the conditioned air via the formaldehyde removal module, and then sends it back into the room. The system controls the rotation speed of the air conditioner fan based on the current energy saving level (S3607''). The controller controls the compressor frequency based on the current energy saving level, with the compressor frequency decreasing as the energy saving level increases. The system adjusts the compressor frequency based on the energy saving level to reduce energy consumption.

[0319] In this embodiment, the air conditioner detects the outdoor temperature using an outdoor temperature sensor. When the outdoor temperature reaches a first preset outdoor temperature and is below a second preset outdoor temperature, the controller controls the indoor heat exchanger to perform a heating cycle and adjusts the compressor power so that the indoor temperature reaches the first set temperature, according to the current energy saving level of the air conditioner.

[0320] As shown in Figures 41 to 44, in some embodiments, if the outdoor temperature has not reached a first preset outdoor temperature, the controller controls the air conditioner fan to enter a standby state.

[0321] In some embodiments, the energy saving levels include a first energy saving level, a second energy saving level, and a third energy saving level. Since the first set temperature differs for each of the three energy saving levels, the compressor power varies to achieve energy savings according to the different energy saving levels. In this way, energy consumption can be set according to the user's needs.

[0322] In some embodiments, the user can adjust the energy-saving level of the air conditioner based on a panel or remote control.

[0323] As shown in Figures 41 to 45, in some embodiments, when the outdoor temperature reaches a first preset outdoor temperature and is below a second preset outdoor temperature, the first set temperature is obtained by dividing the first increment temperature by the energy saving level and then adding the outdoor temperature (S3606'''). The first increment temperature is between 5°C and 10°C. When calculating the first set temperature, the first energy saving level, the second energy saving level, and the third energy saving level are constants, with the second energy saving level being greater than the first energy saving level and the third energy saving level being greater than the second energy saving level.

[0324] For example, assuming that the first energy saving level, second energy saving level, and third energy saving level are 1, 2, and 3 respectively, and the outdoor temperature is 25°C, the first increment temperature is 8°C, and the energy saving level is 2, then the first set temperature would be 25°C + 8°C / 2 = 29°C.

[0325] As shown in Figures 41 to 45, in some embodiments, the controller is configured as follows: When the outdoor temperature reaches a second preset outdoor temperature or higher, the process proceeds to steps S3608 and S3069, where the controller controls the indoor heat exchanger to perform a heating cycle to raise the indoor temperature to the second set temperature, causing indoor formaldehyde to precipitate at a second rate faster than the first rate (S3608), reducing the indoor-outdoor temperature difference, reducing energy consumption, and operating the outdoor fan to discharge the indoor air containing formaldehyde to the outside.

[0326] As shown in Figures 41 to 45, in some embodiments, when the outdoor temperature reaches a second preset outdoor temperature or higher, the second set temperature is calculated by adding a second increment temperature to the outdoor temperature and dividing by the energy saving level. The second increment temperature is between 5°C and 15°C. It should be noted that, in order to avoid dangers such as fire due to an excessively high second set temperature, the second set temperature is limited to a maximum of 50°C. That is, if the temperature obtained by adding the second increment temperature to the outdoor temperature exceeds 50°C, the second set temperature is 50°C.

[0327] For example, assuming that the first, second, and third energy-saving levels are 1, 2, and 3 respectively, and the outdoor temperature is 25°C, the second increment temperature is 10°C, and the energy-saving level is 2, then the first set temperature would be 25°C + 10°C / 2 = 30°C. In this way, energy consumption is saved by controlling the compressor's power according to the energy-saving level.

[0328] As shown in Figures 44 and 45, in some embodiments, when the air conditioner fan draws in indoor air, adsorbs formaldehyde from the conditioned air via a formaldehyde removal module, and then sends it back into the room, the rotational speed of the air conditioner fan is calculated by multiplying the air conditioner rotational speed level by the indoor temperature and dividing by the energy saving level (S3607'''). The air conditioner rotational speed level is between 10 and 40, and the air conditioner rotational speed level is determined according to the actual situation.

[0329] As shown in Figures 44 and 45, in some embodiments, when the air conditioner fan draws in indoor air, adsorbs formaldehyde from the conditioned air via a formaldehyde removal module, and then sends the air back into the room, the rotation speed of the air conditioner fan is adjusted according to the energy saving level to reduce energy consumption (S3607''), and the higher the energy saving level, the lower the rotation speed of the air conditioner fan and the lower the energy consumption.

[0330] For example, assuming that the first, second, and third energy-saving levels are 1, 2, and 3 respectively, and that the indoor temperature is 30°C, the air conditioner's rotation speed level is 40, and the third energy-saving level is 3, the rotation speed of the air conditioner fan is 40 × 30 / 3 = 400 rpm. The rotation speed of the air conditioner fan is a minimum of 200 rpm and a maximum of 1200 rpm. Therefore, if the calculated rotation speed of the air conditioner fan is less than 200 rpm, it will operate at 200 rpm, and if the calculated rotation speed is greater than 1200 rpm, it will operate at 1200 rpm. In this proposed technology, the formaldehyde removal effect is ensured while reducing energy consumption by adjusting the rotation speed of the air conditioner fan as needed.

[0331] As shown in Figures 3A to 3C, in some embodiments of the vertical (cabinet-type) air conditioner of the present invention, the vertical (cabinet-type) air conditioner further includes a formaldehyde concentration sensor, which is installed in a room and configured to detect the formaldehyde concentration in the room.

[0332] As shown in Figures 46 and 50, the controller is configured as follows: The power to the air conditioner is turned on, and the process proceeds to step S3601, where the air conditioner performs formaldehyde removal mode (S3601). The process proceeds to step S3062, where the indoor temperature sensor detects the outdoor temperature and determines whether the current outdoor temperature has reached the first preset outdoor temperature (S3603). If the current outdoor temperature has reached the first preset outdoor temperature, the process proceeds to step S3604. The process determines whether the outdoor temperature has reached the second preset outdoor temperature (S3605), and if the outdoor temperature is less than or equal to the second preset outdoor temperature, the process proceeds to steps S3606 and S3607. When the outdoor temperature reaches a second preset outdoor temperature or higher, the process proceeds to steps S3608 and S3609'''. The controller controls the indoor heat exchanger to perform a heating cycle to raise the indoor temperature to the second set temperature (S3608). The outdoor fan operates to expel indoor air containing formaldehyde to the outside. The formaldehyde concentration sensor detects the formaldehyde content in the room, and the rotation speed of the outdoor fan has a positive correlation with the indoor formaldehyde content; that is, the higher the indoor formaldehyde content, the faster the outdoor fan rotates (S3609'''). In this way, energy consumption can be reduced by adjusting the rotation speed of the outdoor fan according to the indoor formaldehyde concentration. Furthermore, the higher the formaldehyde concentration, the faster the formaldehyde needs to be expelled.

[0333] As shown in Figures 47 and 49, in some embodiments, an outdoor temperature sensor detects the outdoor temperature, and if the outdoor temperature reaches a second preset outdoor temperature or higher, the controller controls the indoor heat exchanger to perform a heating cycle and adjusts the compressor power so that the indoor temperature reaches the second set temperature according to the current energy saving level of the air conditioner (S3608''). By adjusting the indoor temperature based on the outdoor temperature, the compressor is prevented from entering high-load operation, saving energy. Energy consumption is reduced by reducing the indoor-outdoor temperature difference, the indoor formaldehyde concentration sensor detects the indoor formaldehyde concentration, and the outdoor fan is activated. The rotation speed of the outdoor fan is adjusted based on the formaldehyde concentration to discharge the indoor formaldehyde-containing air to the outside at an appropriate speed, completing the formaldehyde removal process while saving energy as much as possible.

[0334] As shown in Figures 46 to 49, in some embodiments, when the outdoor temperature reaches a second preset outdoor temperature or higher, the second preset temperature is obtained by adding a second increment temperature to the outdoor temperature and dividing by the energy saving level (S3608'''). The second increment temperature is between 5°C and 15°C.

[0335] As shown in Figures 46 to 49, in some embodiments, when an outside fan is operated to discharge indoor air containing formaldehyde to the outside, the rotation speed of the outside fan is calculated by multiplying the outside fan rotation speed level by the formaldehyde concentration (step S3609'''). The outside fan rotation speed level is between 40 and 2500, and the outside fan rotation speed level is determined according to the actual situation.

[0336] In some examples, when rapid removal of formaldehyde is required, the ambient air rotation speed is selected to 2500, and when slow and prolonged removal of formaldehyde is required, the ambient air rotation speed is selected to 40. For example, if the formaldehyde concentration is 20 mg / m³ 3 If the ambient air rotation speed level is 80, the ambient air rotation speed will be 20 × 40 = 800 rpm.

[0337] In some embodiments, if the calculated rotational speed of the outdoor fan is less than 200 rpm, it is operated at 200 rpm, and if the calculated rotational speed of the outdoor fan is greater than 1200 rpm, it is operated at 1200 rpm. Therefore, if the calculated rotational speed of the outdoor fan is less than 200 rpm, it is operated at 200 rpm, and if the calculated rotational speed of the outdoor fan is greater than 1200 rpm, it is operated at 1200 rpm. In these embodiments, by adjusting the rotational speed of the outdoor fan as needed, it is possible to reduce energy consumption while ensuring the formaldehyde removal effect.

[0338] As shown in Figures 46 to 49, in some embodiments, if the outdoor temperature has not reached a first preset outdoor temperature, the controller controls the air conditioner fan to enter a standby state.

[0339] As shown in Figures 46 to 49, in some embodiments, when the air conditioner fan draws in indoor air, adsorbs formaldehyde from the conditioned air via a formaldehyde removal module, and then sends it back into the room (S3607), the controller controls the compressor frequency according to the current energy saving level and adjusts the rotation speed of the air conditioner fan according to the energy saving level to reduce energy consumption. The higher the energy saving level, the lower the compressor frequency and the lower the energy consumption (S3607'').

[0340] As shown in Figures 46 to 49, in some embodiments, when the outdoor temperature reaches a first preset outdoor temperature and is below a second preset outdoor temperature, the controller controls the indoor heat exchanger to perform a heating cycle and adjusts the compressor power so that the indoor temperature reaches a first set temperature according to the current energy saving level of the air conditioner (step S3606''). By adjusting the indoor temperature based on the outdoor temperature, the compressor is prevented from entering high-load operation, saving energy. The air conditioner fan draws in indoor air, adsorbs formaldehyde from the conditioned air via the formaldehyde removal module, and then sends it back into the room to complete formaldehyde removal, reducing the formaldehyde content in the indoor air, ensuring formaldehyde removal efficiency, and reducing energy consumption.

[0341] As shown in Figures 46 to 49, in some embodiments, when the outdoor temperature reaches a first preset outdoor temperature and is below a second preset outdoor temperature, the first set temperature is obtained by dividing the first increment temperature by the energy saving level and then adding the outdoor temperature (S3606'''). The first increment temperature is between 5°C and 10°C.

[0342] As shown in Figure 49, in some embodiments, when the air conditioner fan draws in indoor air, adsorbs formaldehyde from the conditioned air via a formaldehyde removal module, and then sends it back into the room, the rotational speed of the air conditioner fan is calculated by multiplying the air conditioner rotational speed level by the indoor temperature and dividing by the energy saving level (S3607'''). The air conditioner rotational speed level is between 10 and 40, and the air conditioner rotational speed level is determined according to the actual situation.

[0343] As shown in Figures 3A and 3B, in some embodiments, the casing 100 is vertical, installed perpendicular to the ground in its longitudinal direction, and there are two outside air outlets 103 and two conditioned air outlets 102. The two outside air outlets 103 are located on both sides of the front of the casing 100, and the two conditioned air outlets 102 are also located on both sides of the front of the casing 100. The conditioned air outlets 102 are spaced apart to correspond to the outside air outlets 103. The air guide plates 104 and drive members are provided in pairs, located on both sides of the casing and installed to correspond to the conditioned air outlets 102. The drive members are located inside the casing 100, and the output shaft of the drive member extends beyond the casing 100 and is connected to the air guide plate 104. The longitudinal direction of the air guide plate 104 is aligned with the longitudinal direction of the casing 100, and both ends of the air guide plate 104 are rotatably connected to the casing 100. The drive member is activated to rotate the air guide plate 104.

[0344] In some embodiments, the air guide plate 104 can completely cover the corresponding air conditioning air outlet 102, thereby preventing dust from entering the air conditioning fan through the air conditioning air outlet 102 when the air conditioner is stopped, and thus preventing the air conditioning fan from affecting its service life.

[0345] As shown in Figures 3A and 3B, in some embodiments, the air conditioning outlet 102 is of any shape, such as rectangular, circular, or elliptical, and is installed vertically. An air conditioning grille is installed on the air conditioning outlet 102. The air conditioning grille includes a mounting frame and a plurality of vertical grilles. The mounting frame is provided on the air conditioning outlet 102, and the plurality of vertical grilles are provided and spaced apart within the mounting frame, with the plurality of vertical grilles arranged along the width direction of the mounting frame. The top and bottom ends of the vertical grilles are connected to the mounting frame. The air conditioning grille prevents foreign objects from entering the air conditioning outlet 102 and damaging the air conditioner fan.

[0346] In some embodiments, the air conditioning grille further includes a plurality of lateral grilles, the ends of which are connected to the inner walls of the mounting frame in the width direction. The plurality of lateral grilles are spaced apart along the longitudinal direction of the mounting frame, and the plurality of lateral grilles and plurality of vertical grilles prevent external structures from entering the air conditioning air outlet 102.

[0347] In several feasible embodiments, based on the flow shown in Figure 36, the air guide plate is reversed back and forth as shown in Figure 38, causing the conditioned air from the conditioned air outlet to swing back and forth (S3604). The controller is then configured as follows: it determines whether the indoor humidity is within the humidity hysteresis range (S3604'). If the result is No, it controls the humidifier to humidify the room (S3604). If the result is Yes, it determines whether the outdoor temperature has reached a second preset outdoor temperature (S3605), and then executes subsequent processes based on the determination result.

[0348] In several feasible embodiments, based on the flow shown in Figure 36, the controller is configured as shown in Figure 39. That is, after determining that the outdoor temperature has reached a first preset outdoor temperature, the air guide plate is reversed back and forth, causing the conditioned air from the air conditioning air outlet to swing back and forth (S3604). It is determined whether or not the outdoor temperature has reached a second preset outdoor temperature (S3605). If no, the first set temperature is obtained by adding the first increment temperature to the current outdoor temperature, and the indoor heat exchanger is made to perform a heating cycle to bring the indoor temperature to the first set temperature (S3606'). The air conditioner fan draws in indoor air, adsorbs formaldehyde from the conditioned air via the formaldehyde removal module, and then sends it back into the room. The rotation speed of the air conditioner fan is the air conditioner rotation speed level multiplied by the indoor temperature (S3607'). If the answer is Yes, the second set temperature is obtained by adding the second increment temperature to the current outdoor temperature, and the indoor heat exchanger is made to perform a heating cycle to bring the indoor temperature to the second set temperature (S3608'). The outdoor fan is operated to expel indoor air containing formaldehyde to the outside, and the rotation speed of the outdoor fan is the outdoor rotation speed level multiplied by the indoor temperature (S3609').

[0349] In several feasible embodiments, the controller is configured as follows, as shown in Figures 41 to 43. Specifically, the air conditioner performs a formaldehyde removal mode (S3601), the outdoor temperature sensor detects the outdoor temperature (S3602), and it is determined whether the outdoor temperature has reached a first preset outdoor temperature (S3603). If No, the process returns to step S3602. If Yes, it is determined whether the outdoor temperature has reached a second preset outdoor temperature (S3605). If No, the compressor frequency is adjusted according to the current energy saving level, and the indoor heat exchanger is made to perform a heating cycle to bring the indoor temperature to a first set temperature (S3606''). The air conditioner fan draws in indoor air, adsorbs formaldehyde from the conditioned air via the formaldehyde removal module, and then sends it back into the room, adjusting the rotation speed of the air conditioner fan according to the current energy saving level (S3607'). If the answer is Yes, the compressor frequency is adjusted according to the current energy saving level, and the indoor heat exchanger is made to perform a heating cycle to bring the indoor temperature to the second set temperature (S3608''). The outdoor fan is operated to expel indoor air containing formaldehyde to the outside (S3609).

[0350] In some feasible embodiments, as shown in Figure 43, the controller controls the air guide plate to reciprocate and invert, causing the conditioned air from the air conditioning outlet to swing back and forth (S3604). After that, it is further configured as follows: it determines whether the indoor humidity is within the humidity hysteresis range (S3604'), and if yes, it determines whether the outdoor temperature has reached a second preset outdoor temperature (S3605), and then executes a subsequent process based on the determination result.

[0351] In some feasible embodiments, the controller is configured as follows, as shown in Figure 44. That is, after determining that the outdoor temperature has reached a first preset outdoor temperature, the air guide plate is reversed back and forth, causing the conditioned air from the air conditioning air outlet to swing back and forth (S3604). It is determined whether or not the outdoor temperature has reached a second preset outdoor temperature (S3605). If no, the first set temperature is obtained by dividing the first increment temperature by the energy saving level and then adding the outdoor temperature, and the indoor heat exchanger is made to perform a heating cycle to bring the indoor temperature to the first set temperature (S3606'''). The air conditioner fan draws in indoor air, adsorbs formaldehyde from the conditioned air via the formaldehyde removal module, and then sends it back into the room. The rotation speed of the air conditioner fan is obtained by multiplying the air conditioner rotation speed level by the indoor temperature and dividing by the energy saving level (S3607'''). If the answer is Yes, the second set temperature is obtained by dividing the second increment temperature by the energy saving level and then adding the outdoor temperature, and the indoor heat exchanger is made to perform a heating cycle to bring the indoor temperature to the second set temperature (S3608''). The outdoor fan is operated to expel indoor air containing formaldehyde to the outside, and the rotation speed of the outdoor fan is the outdoor rotation speed level multiplied by the indoor temperature (S3609'').

[0352] In some feasible embodiments, the controller is configured as follows, as shown in Figures 47-48. Specifically, the air conditioner performs a formaldehyde removal mode (S3601), the outdoor temperature sensor detects the outdoor temperature (S3602), and it is determined whether the outdoor temperature has reached a first preset outdoor temperature (S3603). If No, the process returns to step S3602. If Yes, the humidifier is controlled to humidify the room, the air guide plate is reversed back and forth, and the conditioned air from the air conditioner outlet is swung back and forth (S3604). It is determined whether the outdoor temperature has reached a second preset outdoor temperature (S3605). If No, the compressor frequency is adjusted according to the current energy saving level, and the indoor heat exchanger is made to perform a heating cycle to bring the indoor temperature to a first set temperature (S3606''). The air conditioner fan draws in indoor air, adsorbs formaldehyde from the conditioned air via the formaldehyde removal module, and then sends it back into the room, adjusting the rotation speed of the air conditioner fan according to the current energy saving level (S3607'). If yes, the compressor frequency is adjusted according to the current energy saving level, and the indoor heat exchanger is made to perform a heating cycle to bring the indoor temperature to the second set temperature (S3608''). The outdoor air fan operates to discharge the indoor air containing formaldehyde to the outside, and the indoor formaldehyde concentration is detected; the higher the concentration, the higher the rotation speed of the outdoor air fan (S3609''').

[0353] In some feasible embodiments, as shown in Figure 48, the controller controls the air guide plate to reciprocate and invert, causing the conditioned air from the air conditioning outlet to swing back and forth (S3604), and then further configures as follows: It determines whether the indoor humidity is within the humidity hysteresis range (S3604'), and if yes, it determines whether the outdoor temperature has reached a second preset outdoor temperature (S3605), and executes a subsequent process based on the determination result, and if no, it controls the humidifier to humidify the room (S3604).

[0354] In some feasible embodiments, the controller is configured as follows, as shown in Figure 44. That is, after determining that the outdoor temperature has reached a first preset outdoor temperature, the air guide plate is reversed back and forth, causing the conditioned air from the air conditioning air outlet to swing back and forth (S3604). It is determined whether or not the outdoor temperature has reached a second preset outdoor temperature (S3605). If no, the first set temperature is obtained by dividing the first increment temperature by the energy saving level and then adding the outdoor temperature, and the indoor heat exchanger is made to perform a heating cycle to bring the indoor temperature to the first set temperature (S3606'''). The air conditioner fan draws in indoor air, adsorbs formaldehyde from the conditioned air via the formaldehyde removal module, and then sends it back into the room. The rotation speed of the air conditioner fan is obtained by multiplying the air conditioner rotation speed level by the indoor temperature and dividing by the energy saving level (S3607'''). If the answer is Yes, the second set temperature is obtained by dividing the second increment temperature by the energy saving level and then adding the outdoor temperature, and the indoor heat exchanger is made to perform a heating cycle to bring the indoor temperature to the second set temperature (S3608''). The outdoor fan is operated to discharge indoor air containing formaldehyde to the outside, and the rotation speed of the outdoor fan is the outdoor rotation speed level multiplied by the formaldehyde concentration (S3609'').

[0355] In the above embodiment, the air conditioning air outlet may be the same as the heat exchange air outlet, or it may be an air outlet independent of the heat exchange air outlet. The air conditioning air inlet may be the same as the indoor air inlet, or it may be an air inlet independent of the indoor air inlet. The air conditioner fan may be the same as the heat exchange fan, or it may be an air fan independent of the heat exchange fan.

[0356] Although embodiments of the present application have been described above, it should be understood that these embodiments are merely illustrative and do not limit the present application. Those skilled in the art may modify, alter, substitute, and transform the above embodiments within the scope of the present application. [Explanation of Symbols]

[0357] 100 casing 200 Air conditioning outdoor unit 101 Air conditioning air intake 102 Air conditioning air outlet 103 Outside air outlet 104 Wind guide plate 300 Compressor 400 square valve 500 Outdoor heat exchanger 600 Indoor heat exchanger 601 No. 1 indoor heat exchanger 602 Second indoor heat exchanger 700 Expansion Member 701 First expansion member 702 Second expansion member

Claims

1. It is an air conditioner, This includes an indoor air conditioning unit, and the said indoor air conditioning unit is A casing with a heat exchange air outlet, An indoor heat exchanger is installed inside the casing and performs heat exchange between the refrigerant flowing inside and the indoor air to form a heating cycle or a cooling cycle, and the indoor air after heat exchange flows to the outside of the casing through the heat exchange air outlet. A heat exchange fan configured to drive indoor air and send it into the room through the heat exchange air outlet, A humidifier is installed inside the casing and configured to generate steam and flow it to the outside of the casing, A human body detection sensor configured to detect whether or not a person is present in a room, An indoor temperature sensor configured to detect indoor temperature, An indoor humidity sensor configured to detect indoor humidity, An outside air fan installed within the casing, wherein when the outside air fan rotates forward, outdoor air is driven and introduced into the room via the outside air fan, and when the outside air fan rotates reverse, indoor air is driven and discharged to the outside via the outside air fan. Includes the controller, The aforementioned controller, When the human body detection sensor detects that a person is present in the room, the indoor heat exchanger operates as a condenser, the indoor temperature currently set in the air conditioning indoor unit is defined as the first temperature, and the controller is set to the first humidity corresponding to the first temperature. When the indoor humidity sensor detects that the indoor humidity is equal to or greater than the first humidity level, the humidifier is controlled to maintain its current operating state, and the outdoor fan is controlled to rotate in the forward direction at a first power level lower than the upper limit of the rated power range. An air conditioner that, when the indoor humidity sensor detects that the indoor humidity is lower than the first humidity, controls the humidifier to operate at a second power level lower than the upper limit of the rated power range.

2. The aforementioned air conditioner further, A formaldehyde concentration sensor configured to detect the concentration of formaldehyde in a room, An air conditioning outdoor unit includes at least a compressor, the compressor being connected to an indoor heat exchanger via a refrigerant circuit, The aforementioned controller, The air conditioner according to claim 1, configured to control the outside air fan to stop, the humidifier to stop, and the compressor and the heat exchange fan to maintain their current operating state when the indoor formaldehyde concentration detected by the formaldehyde concentration sensor is lower than a second preset concentration.

3. The aforementioned controller, The air conditioner according to claim 2, wherein if the indoor formaldehyde concentration detected by the formaldehyde concentration sensor is equal to or greater than a second preset concentration, the outside air fan, the humidifier, the compressor, and the heat exchange fan are controlled to operate in a state that maintains their current condition for a first preset time, and then the outside air fan is controlled to stop operating, the humidifier is controlled to stop operating, and the compressor and the heat exchange fan are controlled to maintain their current operating state.

4. The aforementioned controller, When the human body detection sensor detects that there is no person in the room and the indoor heat exchanger is operating as a condenser, The air conditioner according to claim 2, wherein the indoor temperature sensor is configured to control the operating frequency of the compressor when it detects that the indoor temperature is lower than a first preset temperature, and the indoor humidity sensor is configured to control the operating frequency of the compressor when it detects that the indoor humidity is equal to or greater than a first preset humidity.

5. The aforementioned controller, When the human body detection sensor detects that there is no person in the room and the indoor heat exchanger is operating as a condenser, The air conditioner according to claim 2, wherein the indoor temperature sensor is configured to detect when the indoor temperature is lower than a first preset temperature, and the indoor humidity sensor is configured to detect when the indoor humidity is lower than a first preset humidity, the operating frequency of the compressor is controlled to increase and the humidifier is activated.

6. The aforementioned controller, When the human body detection sensor detects that there is no person in the room and the indoor heat exchanger is operating as a condenser, The air conditioner according to claim 2, wherein the indoor temperature sensor is configured to detect that the indoor temperature is above a first preset temperature, and the indoor humidity sensor is configured to control the operating frequency of the compressor so as not to change and to activate the humidifier when it detects that the indoor humidity is below a first preset humidity.

7. The aforementioned controller, When the human body detection sensor detects that there is no person in the room and the indoor heat exchanger is operating as a condenser, The air conditioner according to claim 2, wherein the indoor temperature sensor detects that the indoor temperature is equal to or greater than a first preset temperature, and the indoor humidity sensor detects that the indoor humidity is equal to or greater than a first preset humidity, and is configured to control the compressor so that its operating frequency does not change, control the humidifier so that its operating state does not change, and control the heat exchange fan to operate at the upper limit of its rated power range.

8. The aforementioned controller, When the human body detection sensor detects that there is no person in the room, the indoor temperature sensor detects that the indoor temperature is above a first preset temperature, and the indoor humidity sensor detects that the indoor humidity is above a first preset humidity, The operating frequency of the compressor is controlled so as not to change, and the operating state of the humidifier and the heat exchange fan is controlled so as not to change. The air conditioner according to claim 2, further configured to control the outside air fan to reverse operation at the upper limit of the rated power range after a preset time has elapsed.

9. The aforementioned controller, After a second preset time has elapsed, the outside air fan is controlled to operate in reverse for a third preset time at the upper limit of the rated power range, and then the formaldehyde concentration sensor is controlled to detect the formaldehyde concentration in the room. The air conditioner according to claim 8, configured to control the operation of the outside air fan and the humidifier to stop when it is detected that the indoor formaldehyde concentration is lower than a second preset concentration, and to control the compressor and the heat exchange fan to maintain their current operating state.

10. It is an air conditioner, This includes an indoor air conditioning unit, and the said indoor air conditioning unit is A casing with a heat exchange air outlet, An indoor heat exchanger is installed inside the casing and performs heat exchange between the refrigerant flowing inside and the indoor air to form a heating cycle or a cooling cycle, and the indoor air after heat exchange flows to the outside of the casing through the heat exchange air outlet. A heat exchange fan configured to drive indoor air and send it into the room through the heat exchange air outlet, A humidifier is installed inside the casing and configured to generate steam and flow it to the outside of the casing, A formaldehyde removal module, comprising a formaldehyde removal module configured to remove formaldehyde from the air passing through the formaldehyde removal module, A human body detection sensor configured to detect whether or not a person is present in a room, An indoor temperature sensor configured to detect indoor temperature, An indoor humidity sensor configured to detect indoor humidity, An outside air fan installed within the casing, wherein when the outside air fan rotates forward, outdoor air is driven and introduced into the room via the outside air fan, and when the outside air fan rotates reverse, indoor air is driven and discharged to the outside via the outside air fan. Includes the controller, When the human body detection sensor detects that a person is present in the room, the controller activates the formaldehyde removal module and controls the indoor air to pass through the formaldehyde removal module. When the indoor heat exchanger operates as a condenser, the indoor temperature currently set in the air conditioning indoor unit is defined as the first temperature, and the controller is set to the first humidity corresponding to the first temperature. When the indoor humidity sensor detects that the indoor humidity is equal to or greater than the first humidity, the humidifier is controlled to maintain its current operating state, and the outdoor fan is controlled to rotate in the forward direction at a first power lower than the upper limit of the rated power range. An air conditioner that, when the indoor humidity sensor detects that the indoor humidity is lower than the first humidity, controls the humidifier to operate at a second power level lower than the upper limit of the rated power range.

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