air conditioner

Abstract

The present invention relates to an air conditioner, which belongs to the technical field of air conditioners. The air conditioner comprises: an indoor unit, a first indoor heat exchanger, a second indoor heat exchanger, an air-conditioning fan, an outdoor unit, a compressor, a drain pipe and a controller, wherein the indoor unit is provided with an air-conditioning outlet and an air-conditioning inlet; the second indoor heat exchanger is arranged between the first indoor heat exchanger and the air-conditioning inlet; the outdoor unit is used to be arranged outdoors; the compressor is arranged in the outdoor unit, and the compressor is used to pump refrigerant into the first indoor heat exchanger and the second indoor heat exchanger; one end of the drain pipe is connected to the outdoors, and the other end is close to the second indoor heat exchanger; the controller is configured to: control the second indoor heat exchanger to be used as an evaporator, calculate the current return air dew point temperature difference, and control the second indoor heat exchanger so that the current return air dew point temperature difference is not less than a preset return air dew point temperature difference; and control the first indoor heat exchanger to operate so that the indoor temperature reaches a preset indoor temperature value.

Description

Technical Field

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

[0002] As people's quality of life improves, health is becoming an increasingly important factor in the home. In the home appliance market, more and more appliances are being developed around the theme of "health." Formaldehyde has become the number one killer affecting health in the home, and more and more users are seeking reliable and effective methods to remove it. As a Class I carcinogen, formaldehyde is widely present in home improvement materials such as furniture, walls, and flooring. Its release is long-lasting and slow, with some well-encapsulated home improvement materials releasing formaldehyde for nearly 10 years. Currently, no mature technology can completely remove formaldehyde from home improvement materials in a short period of time.

[0003] Air conditioning is an air conditioner that uses artificial means to adjust the ambient air in a building or structure. temperature 、 humidity 、 flow rate Parameters such as equipment Air conditioners typically consist of indoor and outdoor units. Most do not remove formaldehyde from indoor air, causing it to continue to harm the human body. Air conditioners with formaldehyde removal capabilities use an adsorption module to reduce formaldehyde in indoor air. The adsorption module is typically made of activated carbon or other adsorption materials. However, air conditioners equipped with adsorption modules are complex and expensive. Summary of the Invention

[0004] The present invention solves one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the present application aims to provide an air conditioner that controls the second indoor heat exchanger to function as an evaporator to lower the temperature of the second indoor heat exchanger, causing condensed water to form on the surface of the second indoor heat exchanger. The indoor formaldehyde dissolves in the condensed water, and the indoor condensed water is discharged to the outside through a drain pipe, thereby achieving the effect of removing formaldehyde. Furthermore, the first indoor heat exchanger is used to regulate the temperature of the air passing through the second indoor heat exchanger to prevent the second indoor heat exchanger from affecting the indoor temperature, ensuring that the indoor temperature does not affect the user's comfort.

[0006] To achieve the above object, the present invention provides an air conditioner, comprising:

[0007] An indoor unit, wherein the indoor unit is provided with an air-conditioning outlet and an air-conditioning inlet;

[0008] a first indoor heat exchanger, wherein the first indoor heat exchanger is disposed in the indoor unit;

[0009] a second indoor heat exchanger, the second indoor heat exchanger being arranged between the first indoor heat exchanger and the air inlet of the air conditioner;

[0010] An air-conditioning fan is provided in the indoor unit, and is used to pass air through the second indoor heat exchanger, then through the first indoor heat exchanger and into the room through the air-conditioning outlet;

[0011] An outdoor unit, the outdoor unit being arranged outdoors;

[0012] a compressor, the compressor being disposed in the outdoor unit and being used to pump refrigerant into the first indoor heat exchanger and the second indoor heat exchanger;

[0013] a drain pipe, one end of which is connected to the outside of the room and the other end of which is close to the second indoor heat exchanger;

[0014] a controller configured to: control the second indoor heat exchanger to function as an evaporator, calculate a current return air dew point temperature difference, and control the second indoor heat exchanger so that the current return air dew point temperature difference is not less than a preset return air dew point temperature difference;

[0015] The first indoor heat exchanger is controlled to operate so that the indoor temperature reaches a preset indoor temperature value.

[0016] In this technical solution, the second indoor heat exchanger is controlled to function as an evaporator, thereby lowering its temperature. This causes condensation on its surface, dissolving indoor formaldehyde in the condensed water. This condensed water is then drained outdoors through a drainpipe, effectively removing formaldehyde. Furthermore, the first indoor heat exchanger regulates the temperature of the air passing through the second indoor heat exchanger to prevent it from affecting the indoor temperature and ensure that the indoor temperature does not affect user comfort.

[0017] Some of the embodiments of the present application also include:

[0018] a second throttle element, the second throttle element being used to control the pressure and temperature of the refrigerant entering the second indoor heat exchanger;

[0019] A first throttling device is used to control the pressure and temperature of the refrigerant entering the first indoor heat exchanger.

[0020] In the technical solution, the temperature of the second indoor heat exchanger and the temperature of the first indoor heat exchanger are controlled respectively by the second throttling member and the first throttling member.

[0021] In some embodiments of the present application, an indoor coil temperature sensor is provided in the indoor unit, which is used to detect the temperature of the second indoor heat exchanger to obtain a second coil temperature value;

[0022] The controller is configured to: control the indoor coil temperature sensor to obtain a 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 less than the preset coil temperature value, control the second throttling member to increase its opening.

[0023] In the technical solution, the temperature of the second indoor heat exchanger is adjusted to ensure that condensed water can be generated on the second indoor heat exchanger to ensure the effect of removing formaldehyde.

[0024] In some embodiments of the present application, the controller is configured to: if the second coil temperature value is greater than the preset coil temperature value, calculate the current return air dew point temperature difference; if the current return air dew point temperature difference is less than the preset return air dew point temperature difference, control the second throttling device to reduce the opening to reduce the second coil temperature value.

[0025] In the technical solution, the temperature of the second indoor heat exchanger is adjusted to ensure that condensed water can be generated on the second indoor heat exchanger to ensure the effect of removing formaldehyde.

[0026] In some embodiments of the present application, the controller is configured to determine the relationship between the second coil temperature value and the preset coil temperature value once every first detection time.

[0027] In the technical solution, re-detection is performed every first detection time to ensure that the temperature of the second indoor heat exchanger is within the correct range in real time.

[0028] In some embodiments of the present application, a return air temperature sensor is provided at the air inlet of the air conditioner, and the return air temperature sensor is used to detect the indoor air to obtain a return air temperature value.

[0029] In some embodiments of the present application, the controller is configured to control the return air temperature sensor and obtain the return air temperature value, determine the relationship between the return air temperature value and the first preset temperature value and the second preset temperature value, and if the return air temperature value is less than the first preset temperature value, control the first throttling device to increase the opening; if the return air temperature value is greater than the second preset temperature value, control the first throttling device to decrease the opening.

[0030] In the technical solution, when the return air temperature is lower than a first preset temperature value, the temperature of the first indoor heat exchanger is increased by adjusting the first throttle element. When the return air temperature is higher than a second preset temperature value, the temperature of the first indoor heat exchanger is decreased by adjusting the first throttle element.

[0031] In some embodiments of the present application, the controller is configured to control the return air temperature sensor and obtain the return air temperature value. If the return air temperature value is less than the first preset temperature value, the compressor is controlled to increase the incremental frequency on the current operating frequency; if the return air temperature value is greater than the second preset temperature value, the compressor is controlled to subtract the decrement frequency on the current operating frequency.

[0032] In the technical solution, when the return air temperature is lower than a first preset temperature value, the temperature of the first indoor heat exchanger is increased by adjusting the compressor. When the return air temperature is higher than a second preset temperature value, the temperature of the first indoor heat exchanger is decreased by adjusting the compressor.

[0033] In some embodiments of the present application, the controller is configured to determine the relationship between the return air temperature value and the first preset temperature value and the second preset temperature value every second detection time.

[0034] In the technical solution, whether the first indoor heat exchanger reaches the preset temperature is detected every second detection time, and adjustments are made to ensure that the temperature of the first indoor heat exchanger is within a correct range.

[0035] In some embodiments of the present application, the air conditioning fan has a first speed and a second speed, and the first speed is greater than the second speed;

[0036] The controller is configured to, before controlling the second indoor heat exchanger to function as an evaporator, control the air-conditioning fan to operate at a first speed for a first duration and then control the air-conditioning fan to operate at a second speed.

[0037] In the technical solution, this method is used to increase the latent heat ratio in the heat exchange, improve the heat exchange effect, and enhance the formaldehyde removal effect.

[0038] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic diagram of the overall structure of an air conditioner according to an embodiment of the present application;

[0040] Figure 2 is a schematic diagram of the overall structure of an indoor unit according to an embodiment of the present application;

[0041] Figure 3 is a front view of an indoor unit according to an embodiment of the present application;

[0042] Figure 4 is a structural schematic diagram of an air conditioner according to an embodiment of the present application;

[0043] Figure 5 is a flowchart of an air conditioner according to an embodiment of the present application;

[0044] Figure 6 is a flowchart of an air conditioner according to an embodiment of the present application;

[0045] Figure 7 is a flowchart of an air conditioner according to an embodiment of the present application;

[0046] Figure 8 is a flowchart of an air conditioner according to an embodiment of the present application;

[0047] Figure 9 is a flowchart of an air conditioner according to an embodiment of the present application;

[0048] Figure 10 It is a working flow chart of the air conditioner according to the embodiment of the present application.

[0049] In the above figures: 100, indoor unit; 200, outdoor unit; 300, compressor; 400, four-way valve; 500, outdoor heat exchanger; 600, first indoor heat exchanger; 700, first throttling device; 800, second indoor heat exchanger; 900, second throttling device. DETAILED DESCRIPTION

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0051] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; direct connections or indirect connections through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0052] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0053] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0054] The present invention is described in detail below by way of exemplary embodiments, but it should be understood that elements, structures, and features of one embodiment may be beneficially combined in other embodiments without further description.

[0055] In this application, the air conditioner utilizes a compressor, condenser, expansion valve, and evaporator to perform a refrigeration cycle. The refrigeration cycle involves a series of processes, including compression, condensation, throttling, and evaporation, supplying cooling or heat to the conditioned and heat-exchanged air. The compressor compresses low-temperature, low-pressure refrigerant gas and discharges it as high-temperature, high-pressure refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, releasing heat to the surrounding environment through the condensation process. The expansion valve throttles the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure, gas-liquid two-phase refrigerant. In the evaporator, the refrigerant expanded in the expansion valve absorbs heat and evaporates, leaving it at a low temperature and low pressure. The refrigerant gas then returns to the compressor. The evaporator achieves a cooling effect by utilizing the refrigerant's latent heat of vaporization to exchange heat with the material to be cooled. Throughout this cycle, the air conditioner indoor unit can regulate the temperature of the indoor space. The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and the expansion valve can be provided in either the indoor or outdoor unit. The indoor and outdoor heat exchangers can function as either condensers or evaporators, respectively. When the indoor heat exchanger functions as a condenser, the indoor unit of the air conditioner functions as a heater in heating mode. When the indoor heat exchanger functions as an evaporator, the indoor unit of the air conditioner functions as a cooler in cooling mode.

[0056] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0057] As attached Figures 1 to 5 As shown, in an exemplary embodiment of the air conditioner of the present invention, the air conditioner includes: an indoor unit 100, a first indoor heat exchanger 600, a second indoor heat exchanger 800, an air-conditioning fan, an outdoor unit 200, a compressor 300, a drain pipe and a controller, wherein the indoor unit 100 is provided with an air-conditioning outlet and an air-conditioning inlet; the first indoor heat exchanger 600 is arranged in the indoor unit 100; the second indoor heat exchanger 800 is arranged between the first indoor heat exchanger 600 and the air-conditioning inlet; the air-conditioning fan is arranged in the indoor unit 100, and is used to pass air through the two indoor heat exchangers, then pass through the first indoor heat exchanger 600 and transport it to the room through the air-conditioning outlet; the outdoor unit 200 is used to be arranged outdoors; the compressor 300 is arranged in the outdoor unit 200, and is used to pump refrigerant into the first indoor heat exchanger 600 and the second indoor heat exchanger 800; one end of the drain pipe is connected to the outdoors, and the other end is close to the second indoor heat exchanger 800;

[0058] The controller is configured to: control the second indoor heat exchanger 800 to be used as an evaporator, calculate the current return air dew point temperature difference, and control the second indoor heat exchanger 800 so that the current return air dew point temperature difference is not less than the preset return air dew point temperature difference; control the first indoor heat exchanger 600 to operate so that the indoor temperature reaches the preset indoor temperature value.

[0059] In the prior art, the solution for removing formaldehyde is to install a filter module in the air-conditioning indoor unit 100. When the air-conditioning wind circulates the indoor air containing formaldehyde, the formaldehyde in the air is adsorbed by the filter module, completing the formaldehyde removal. However, this method requires a separate filter module to be installed inside the indoor unit 100, which increases the cost. In addition, after adding the filter module, the thickness of the indoor unit 100 also needs to be increased accordingly, and the material used for the indoor unit 100 will also increase, increasing the cost of the entire unit. Moreover, although the filter module adsorbs the formaldehyde, the filter module is still installed in the indoor unit 100, and the formaldehyde is still in the room, so it will still affect the health of the user.

[0060] Through the above solution, the present application controls the second indoor heat exchanger 800 to function as an evaporator to reduce its temperature, causing condensation on the surface of the second indoor heat exchanger 800. This condensation dissolves indoor formaldehyde in the condensation, which is then drained outdoors through a drainpipe, achieving formaldehyde removal. Furthermore, the first indoor heat exchanger 600 is used to regulate the temperature of the air passing through the second indoor heat exchanger 800 to prevent the second indoor heat exchanger 800 from affecting the indoor temperature, ensuring that the indoor temperature does not affect the user's thermal comfort.

[0061] In some embodiments, the system further includes a second throttle member 900 and a first throttle member 700. The second throttle member 900 is used to control the pressure and temperature of the refrigerant entering the second indoor heat exchanger 800. The first throttle member 700 is used to control the pressure and temperature of the refrigerant entering the first indoor heat exchanger 600. The temperature of the second indoor heat exchanger 800 and the temperature of the first indoor heat exchanger 600 are controlled by the second throttle member 900 and the first throttle member 700, respectively.

[0062] In some embodiments, an outdoor heat exchanger 500 is further provided inside the outdoor unit 200, and the compressor 300 has two connection ends, which are respectively connected to and communicate with the second indoor heat exchanger 800 and the outdoor heat exchanger 500. The first indoor heat exchanger 600 is provided between the second indoor heat exchanger 800 and the outdoor heat exchanger 500.

[0063] Please refer to Figure 4In some embodiments, a first throttle member 700 is disposed between the first indoor heat exchanger 600 and the outdoor heat exchanger 500. The first throttle member 700 regulates the pressure and temperature of the refrigerant between the outdoor heat exchanger 500 and the first indoor heat exchanger 600 to regulate the temperature of the first indoor heat exchanger 600. A second throttle member 900 is disposed between the first indoor heat exchanger 600 and the second indoor heat exchanger 800. The second throttle member 900 regulates the pressure and temperature of the refrigerant between the first indoor heat exchanger 600 and the second indoor heat exchanger 800 to regulate the temperature of the second indoor heat exchanger 800.

[0064] 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 800. The four-way valve 400 can adjust the flow direction of the refrigerant to achieve switching between heating mode and cooling mode.

[0065] In the cooling mode, the compressor 300 outputs the refrigerant, which passes through the outdoor heat exchanger 500 , the first indoor heat exchanger 600 , and the second indoor heat exchanger 800 in sequence and then flows back to the compressor 300 .

[0066] In the heating mode, the compressor 300 outputs the refrigerant, which passes through the second indoor heat exchanger 800 , the first indoor heat exchanger 600 , and the outdoor heat exchanger 500 in sequence and then flows back to the compressor 300 .

[0067] In some embodiments, an indoor coil temperature sensor is provided in the indoor unit 100 , which is used to detect the temperature of the second indoor heat exchanger 800 to obtain a second coil temperature value;

[0068] Please refer to Figures 5 to 7 The controller is configured to control the indoor coil temperature sensor to obtain a 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 less than the preset coil temperature value, control the second throttle member 900 to open wider to increase the pressure and temperature of the refrigerant passing through the second indoor heat exchanger 800. If the second coil temperature value is less than the preset coil temperature value, indicating that the temperature of the second indoor heat exchanger 800 is low, the second throttle member 900 is used to increase the pressure and temperature of the refrigerant passing through the second indoor heat exchanger 800 to prevent formaldehyde polymerization and ensure effective formaldehyde removal.

[0069] In some embodiments, the controller is configured to increase the second opening increment based on the current opening of the second throttle member 900 if the second coil temperature value is less than the preset coil temperature value. The second opening increment is greater than zero, and the specific value of the second opening increment is selected according to needs.

[0070] In some embodiments, the controller is configured to: if the second coil temperature value is greater than a preset coil temperature value, calculate the current return air dew point temperature difference; if the current return air dew point temperature difference is less than the preset return air dew point temperature difference, control the second throttle member 900 to reduce its opening to reduce the pressure and temperature of the refrigerant passing through the second indoor heat exchanger 800. The temperature of the second indoor heat exchanger 800 is adjusted to ensure that condensed water is generated on the second indoor heat exchanger 800, thereby ensuring the effective removal of formaldehyde.

[0071] Please refer to Figures 5 to 10 In some embodiments, the controller is configured to: if the current return air dew point temperature difference is less than a predetermined return air dew point temperature difference, subtract a second opening decrement from the current opening of the second throttle member 900. The second opening decrement is greater than zero, and the specific value of the second opening decrement is selected based on the needs.

[0072] In some embodiments, the current return air dew point temperature difference is the return air dew point temperature minus the temperature of the second indoor heat exchanger 800. The return air dew point temperature is calculated as follows:

[0073]

[0074]

[0075] Where Td is the dew point temperature, T is the indoor temperature, and RH is the indoor relative humidity.

[0076] In some embodiments, the return air dew point temperature difference is automatically calculated by computer software, or calculated and returned via the cloud.

[0077] If the current return air dew point temperature difference is less than the preset return air dew point temperature difference, it means that the current temperature of the second indoor heat exchanger 800 is higher. Therefore, the second throttle element 900 is controlled to reduce the pressure and temperature of the refrigerant passing through the second indoor heat exchanger 800 to reduce the temperature of the second indoor heat exchanger 800.

[0078] In some embodiments, the controller is configured to maintain the current state of operation if the current return air dew point temperature difference is greater than a preset return air dew point temperature difference.

[0079] In some embodiments, the controller is configured to determine the relationship between the second coil temperature and the preset coil temperature every first detection time, and re-detect the temperature every first detection time to ensure that the temperature of the second indoor heat exchanger 800 is within the correct range in real time.

[0080] In some embodiments, the controller is configured to determine whether the first indoor heat exchanger 600 is within a suitable temperature range if the second coil temperature value is greater than the preset coil temperature value and the current return air dew point temperature difference is greater than the preset return air dew point temperature difference, so that the indoor temperature reaches the preset indoor temperature value.

[0081] In some embodiments, the controller is configured to determine whether the first indoor heat exchanger 600 is within the appropriate temperature range if the second coil temperature value is greater than the preset coil temperature value, and the current return air dew point temperature difference is greater than the preset return air dew point temperature difference, and is maintained for a first preset time, so that the indoor temperature reaches the preset indoor temperature value.

[0082] In some embodiments, the controller is configured to control the second indoor heat exchanger 800 to function as an evaporator while controlling the first indoor heat exchanger 600 to operate so that the indoor temperature reaches a preset indoor temperature value.

[0083] Please refer to Figures 5 to 10 In some embodiments, the air conditioner adjusts to the season, operating in a first mode for formaldehyde removal in summer, a second mode for formaldehyde removal in spring and autumn, and a third mode for formaldehyde removal in winter. The primary difference between the first, second, and third modes lies in the different preset coil temperature values ​​and preset indoor temperature values. These values ​​are preset based on user needs, selected from cloud data, or factory-set.

[0084] In some embodiments, the selection of the first mode, the second mode, or the third mode for formaldehyde removal is based on instructions sent from the cloud, or the controller detects the season at the current time point and makes the selection.

[0085] In some embodiments, a return air temperature sensor is provided at the air inlet of the air conditioner, and the return air temperature sensor is used to detect the indoor air to obtain a return air temperature value, which is the indoor temperature.

[0086] Please refer to Figures 5 to 10 In some embodiments, the controller is configured to control the return air temperature sensor to obtain a return air temperature value, determine the relationship between the return air temperature value and a first preset temperature value and a second preset temperature value, and if the return air temperature value is less than the first preset temperature value, control the first throttle member 700 to increase the pressure and temperature of the refrigerant passing through the first indoor heat exchanger 600; if the return air temperature value is greater than the second preset temperature value, control the first throttle member 700 to reduce the pressure and temperature of the refrigerant passing through the first indoor heat exchanger 600. When the return air temperature is less than the first preset temperature value, the temperature of the first indoor heat exchanger 600 is increased by adjusting the first throttle member 700. When the return air temperature is greater than the second preset temperature value, the temperature of the first indoor heat exchanger 600 is reduced by adjusting the first throttle member 700.

[0087] In some embodiments, if the return air temperature is less than the first preset temperature, a first opening increment is added to the current opening of the first throttle member 700. The first opening increment is greater than zero, and the specific value of the first opening increment is selected according to needs.

[0088] In some embodiments, if the return air temperature is greater than the second preset temperature, the first opening decrement is subtracted from the current opening of the first throttle member 700. The first opening decrement is greater than zero, and the specific value of the first opening decrement is selected according to needs.

[0089] In some embodiments, if the return air temperature is greater than the first preset temperature value and less than the second preset temperature value, the current state is maintained.

[0090] In some embodiments, the preset indoor temperature is between a first preset temperature value and a second preset temperature value. The first preset temperature value and the second preset temperature value are adjusted according to the adjustment of the preset indoor temperature value, or the first preset temperature value and the second preset temperature value are preset according to user needs, or are selected based on cloud data, or are preset when the air conditioner is shipped from the factory.

[0091] In some embodiments, the above technical solution of changing the temperature of the first indoor heat exchanger 600 by adjusting the first throttling member 700 operates in the first mode of formaldehyde removal.

[0092] Please refer to Figures 5 to 10 In some embodiments, the controller is configured to control the return air temperature sensor to obtain a return air temperature value. If the return air temperature value is less than a first preset temperature value, the controller controls the compressor 300 to increase the incremental frequency from the current operating frequency. If the return air temperature value is greater than a second preset temperature value, the controller controls the compressor 300 to subtract the decremental frequency from the current operating frequency. When the return air temperature is less than the first preset temperature value, the compressor 300 is adjusted to increase the temperature of the first indoor heat exchanger 600. When the return air temperature is greater than the second preset temperature value, the compressor 300 is adjusted to decrease the temperature of the first indoor heat exchanger 600.

[0093] In some embodiments, the increment frequency and the decrement frequency are selected according to needs. Both the increment frequency and the decrement frequency are greater than zero.

[0094] In some embodiments, the above technical solution of adjusting the frequency of the compressor 300 to change the temperature of the first indoor heat exchanger 600 operates in the second mode of formaldehyde removal.

[0095] In some embodiments, the above technical solution of adjusting the frequency of the compressor 300 to change the temperature of the first indoor heat exchanger 600 operates in the third mode of formaldehyde removal.

[0096] In some embodiments, the specific value of the incremental frequency is preset according to user needs, or selected according to cloud data, or preset when the air conditioner leaves the factory.

[0097] In some embodiments, the controller is configured to determine the relationship between the return air temperature and the first and second preset temperature values ​​every second detection time. At every second detection time, the controller detects whether the first indoor heat exchanger 600 has reached a preset temperature and adjusts the temperature to ensure that the temperature of the first indoor heat exchanger 600 is within a correct range.

[0098] In some embodiments, the air conditioning fan has a first speed and a second speed, the first speed being greater than the second speed;

[0099] Please refer to Figures 5 to 10 The controller is configured to, before controlling the second indoor heat exchanger 800 to function as an evaporator, control the air conditioner fan to operate at a first speed for a first duration, and then control the air conditioner fan to operate at a second speed. This method evenly distributes indoor formaldehyde throughout the indoor air, increases the latent heat ratio in the heat exchange rate, improves heat exchange efficiency, and enhances formaldehyde removal.

[0100] In some embodiments, the controller is configured to, after entering the formaldehyde removal mode, control the air-conditioning fan to run at a first speed for a first duration, then control the air-conditioning fan to run at a second speed for a second duration, and then control the second indoor heat exchanger 800 to be used as an evaporator.

[0101] In some embodiments, the return air temperature is between the first preset temperature value and the second preset temperature value for a second preset time. It is determined whether the user has exited the formaldehyde removal mode. If so, the formaldehyde removal mode is exited; if not, the current formaldehyde removal mode is re-circulated.

[0102] In some embodiments, the first speed and the second speed are preset according to user needs, or selected according to cloud data, or preset when the air conditioner leaves the factory.

[0103] In some embodiments, an outdoor fan is provided in the outdoor unit 200 , and the outdoor fan is used to blow air through the outdoor heat exchanger 500 to achieve heat exchange with the refrigerant in the outdoor heat exchanger 500 .

[0104] In some embodiments, the outdoor fan has a first outdoor speed, a second outdoor speed, and a third outdoor speed. In a first mode for removing formaldehyde, the outdoor fan operates at the first outdoor speed. In a second mode for removing formaldehyde, the outdoor fan operates at the second outdoor speed. In a third mode for removing formaldehyde, the outdoor fan operates at the third outdoor speed.

[0105] In some embodiments, the first outdoor rotation speed is greater than the second outdoor rotation speed and greater than the third outdoor rotation speed.

[0106] In some embodiments, the first outdoor speed, the second outdoor speed, and the third outdoor speed are selected according to actual needs.

[0107] In some embodiments, the compressor 300 has a first frequency, a second frequency, and a third frequency. In the first mode for removing formaldehyde, the initial frequency of the compressor 300 is the first frequency. In the second mode for removing formaldehyde, the initial frequency of the compressor 300 is the second frequency. In the third mode for removing formaldehyde, the initial frequency of the compressor 300 is the third frequency.

[0108] In some embodiments, the second frequency is less than the third frequency.

[0109] In some embodiments, the first throttling member 700 is a first expansion valve having a first opening and a second opening. The first opening is fully open, and the second opening is smaller than the first opening. The second opening is selected according to actual needs.

[0110] In the first formaldehyde removal mode, the initial opening of the first expansion valve is the second opening. In the second and third formaldehyde removal modes, the initial opening of the first expansion valve is the first opening.

[0111] In some embodiments, the second throttling member 900 is a second expansion valve, and the second expansion valve has a third opening degree, a fourth opening degree, and a fifth opening degree that decrease in sequence.

[0112] In the first formaldehyde removal mode, the initial opening of the second expansion valve is the third opening. In the second formaldehyde removal mode, the initial opening of the second expansion valve is the fourth opening. In the third formaldehyde removal mode, the initial opening of the second expansion valve is the fifth opening.

[0113] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An air conditioner, characterized in that: It includes: An indoor unit, wherein the indoor unit is provided with an air-conditioning outlet and an air-conditioning inlet; a first indoor heat exchanger, wherein the first indoor heat exchanger is disposed in the indoor unit; a second indoor heat exchanger, the second indoor heat exchanger being arranged between the first indoor heat exchanger and the air inlet of the air conditioner; An air-conditioning fan is provided in the indoor unit, and is used to pass air through the second indoor heat exchanger, then through the first indoor heat exchanger and into the room through the air-conditioning outlet; An outdoor unit, the outdoor unit being arranged outdoors; a compressor, the compressor being disposed in the outdoor unit and being used to pump refrigerant into the first indoor heat exchanger and the second indoor heat exchanger; a drain pipe, one end of which is connected to the outside of the room and the other end of which is close to the second indoor heat exchanger; The indoor unit is provided with an indoor coil temperature sensor, which is used to detect the temperature of the second indoor heat exchanger to obtain a second coil temperature value; a second throttle element, the second throttle element being used to control the pressure and temperature of the refrigerant entering the second indoor heat exchanger; a first throttle element, the first throttle element being used to control the pressure and temperature of the refrigerant entering the first indoor heat exchanger; The controller is configured to: control the second indoor heat exchanger to function as an evaporator, calculate a current return air dew point temperature difference, and control the second indoor heat exchanger so that the current return air dew point temperature difference is not less than a preset return air dew point temperature difference; wherein the current return air dew point temperature difference is the return air dew point temperature minus the temperature of the second indoor heat exchanger; Controlling the first indoor heat exchanger to operate so that the indoor temperature reaches a preset indoor temperature value; controlling the indoor coil temperature sensor to obtain a second coil temperature value, determining a relationship between the second coil temperature value and a preset coil temperature value, and controlling the second throttling element to increase its opening if the second coil temperature value is less than the preset coil temperature value; If the second coil temperature value is greater than the preset coil temperature value, the current return air dew point temperature difference is calculated; if the current return air dew point temperature difference is less than the preset return air dew point temperature difference, the second throttling element is controlled to reduce its opening.

2. The air conditioner according to claim 1, characterized in that The controller is configured to determine the relationship between the second coil temperature value and the preset coil temperature value every first detection time.

3. The air conditioner according to claim 1, characterized in that A return air temperature sensor is provided at the air inlet of the air conditioner, and the return air temperature sensor is used to detect the indoor air to obtain the return air temperature value.

4. The air conditioner according to claim 3, characterized in that The controller is configured to control the return air temperature sensor to obtain a return air temperature value, determine a relationship between the return air temperature value and a first preset temperature value and a second preset temperature value, and control the first throttle element to increase its opening if the return air temperature value is less than the first preset temperature value; If the return air temperature value is greater than the second preset temperature value, the first throttling member is controlled to reduce its opening.

5. The air conditioner according to claim 4, characterized in that The controller is configured to control the return air temperature sensor and obtain the return air temperature value. If the return air temperature value is less than the first preset temperature value, the controller controls the compressor to increase the incremental frequency on the current operating frequency; if the return air temperature value is greater than the second preset temperature value, the controller controls the compressor to subtract the decrement frequency on the current operating frequency.

6. The air conditioner according to claim 5, characterized in that The controller is configured to determine the relationship between the return air temperature value and the first preset temperature value and the second preset temperature value every second detection time.

7. The air conditioner according to any one of claims 1 to 6, characterized in that: The air-conditioning fan has a first speed and a second speed, the first speed being greater than the second speed; The controller is configured to, before controlling the second indoor heat exchanger to function as an evaporator, control the air-conditioning fan to operate at a first speed for a first duration and then control the air-conditioning fan to operate at a second speed.

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