Air conditioner

Abstract

The invention relates to an air conditioner, and 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 conditioner fan, an outdoor unit, a compressor, a drain pipe and a controller, the indoor unit is provided with an air conditioner air outlet and an air conditioner air inlet; the second indoor heat exchanger is arranged between the first indoor heat exchanger and the air conditioner air inlet; the outdoor unit is arranged outdoors; the compressor is arranged in the outdoor unit and used for pumping refrigerants into the first indoor heat exchanger and the second indoor heat exchanger. The other end of the drainage pipe 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 to make the current return air dew point temperature difference not smaller than the preset return air dew point temperature difference. And the first indoor heat exchanger is controlled to operate so that the indoor temperature reaches the 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] At present, with the improvement of people's quality of life and living standards, health has become an increasingly important factor in the family scene. For the home appliance market, more and more home appliances are developing around the theme of "health". Formaldehyde has become the number one killer affecting the health of the family scene, and more and more users are beginning to look for reliable and effective ways to remove formaldehyde. As a primary carcinogen, formaldehyde is widely present in home decoration materials such as furniture, walls, and floors. Its release is long and slow, and the formaldehyde contained in some home decoration materials with good encapsulation can be released for nearly 10 years. At present, there is no mature technology that can completely remove the formaldehyde contained in home decoration 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 usually include indoor and outdoor units. Most air conditioners do not have the function of removing indoor formaldehyde, so formaldehyde will continue to cause harm to the human body. Air conditioners with formaldehyde removal function all use adsorption modules to reduce formaldehyde in indoor air. The adsorption module is generally activated carbon or other adsorption materials. However, air conditioners equipped with adsorption modules have complex structures and high costs. 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, which controls the second indoor heat exchanger to be used as an evaporator to reduce the temperature of the second indoor heat exchanger, so that condensed water condenses 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 to achieve the effect of removing formaldehyde. In addition, the first indoor heat exchanger is used to adjust the temperature of the air passing through the second indoor heat exchanger to avoid the influence of the second indoor heat exchanger on the indoor temperature, ensuring that the indoor temperature does not affect the comfort of the user.

[0006] To achieve the above object, the present invention provides an air conditioner, comprising: An indoor unit, wherein the indoor unit is provided with an air-conditioning air outlet and an air-conditioning air 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 is arranged between the first indoor heat exchanger and the air inlet of the air conditioner; An air conditioning fan, the air conditioning fan is arranged in the indoor unit, and the air conditioning fan is used to transport air through the second indoor heat exchanger, the first indoor heat exchanger and the air conditioning outlet to the indoor room; An outdoor unit, the outdoor unit is used to be 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 and the other end of which 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; The first indoor heat exchanger is controlled to operate so that the indoor temperature reaches a preset indoor temperature value.

[0007] In the technical solution, the temperature of the second indoor heat exchanger is lowered by controlling the second indoor heat exchanger to be used as an evaporator, so that condensed water condenses 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 the drain pipe, thereby achieving the effect of removing formaldehyde. In addition, the first indoor heat exchanger is used to adjust the temperature of the air passing through the second indoor heat exchanger to avoid the influence of the second indoor heat exchanger on the indoor temperature, ensuring that the indoor temperature does not affect the comfort of the user.

[0008] Some of the embodiments of the present application also include: a second throttling element, the second throttling element being used to control the pressure and temperature of the refrigerant entering the second indoor heat exchanger; The first throttling device is used to control the pressure and temperature of the refrigerant entering the first indoor heat exchanger.

[0009] 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 element and the first throttling element.

[0010] 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 the second coil temperature value; 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.

[0011] 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.

[0012] 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 so as to reduce the second coil temperature value.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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 indoor air to obtain a return air temperature value.

[0017] 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 reduce the opening.

[0018] In the technical solution, when the return air temperature is lower than the first preset temperature value, the temperature of the first indoor heat exchanger is increased by adjusting the first throttling element. When the return air temperature is higher than the second preset temperature, the temperature of the first indoor heat exchanger is reduced by adjusting the first throttling element.

[0019] 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.

[0020] In the technical solution, when the return air temperature is lower than the 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 the second preset temperature, the temperature of the first indoor heat exchanger is reduced by adjusting the compressor.

[0021] 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 once every second detection time.

[0022] In the technical solution, whether the first indoor heat exchanger reaches a 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.

[0023] 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; The controller is configured to, before controlling the second indoor heat exchanger to be used 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.

[0024] In the technical solution, this method is used to increase the latent heat ratio in the heat exchange amount, improve the heat exchange effect, and enhance the formaldehyde removal effect.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the overall structure of an air conditioner according to an embodiment of the present application; Figure 2 is a schematic diagram of the overall structure of an indoor unit according to an embodiment of the present application; Figure 3 is a front view of an indoor unit according to an embodiment of the present application; Figure 4 is a structural schematic diagram of an air conditioner according to an embodiment of the present application; Figure 5 is a working flow chart of an air conditioner according to an embodiment of the present application; Figure 6 is a working flow chart of an air conditioner according to an embodiment of the present application; Figure 7 is a working flow chart of an air conditioner according to an embodiment of the present application; Figure 8 is a working flow chart of an air conditioner according to an embodiment of the present application; Fig. 9is a working flow chart of an air conditioner according to an embodiment of the present application; Fig.10 It is a working flow chart of the air conditioner according to the implementation mode of the present application.

[0027] 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

[0028] 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 indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0029] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description. In the present application, the air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, throttling and evaporation, and supplies cold or heat to the air that has been conditioned and heat exchanged. The compressor compresses the refrigerant gas in a low-temperature and low-pressure state and discharges the refrigerant gas in a high-temperature and high-pressure state. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process. The expansion valve throttles the liquid phase refrigerant in a high-temperature and high-pressure state 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, and is in a low-temperature and low-pressure state, and then the refrigerant gas returns to the compressor. The evaporator can achieve a refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the whole cycle, the indoor unit of the air conditioner can adjust the temperature of the indoor space. The outdoor unit of the air conditioner refers to the part of the refrigeration cycle including the compressor and the outdoor heat exchanger, the indoor unit of the air conditioner includes the indoor heat exchanger, and the expansion valve may be provided in the indoor unit or the outdoor unit. The indoor heat exchanger and the outdoor heat exchanger may be used as a condenser or an evaporator, respectively. When the indoor heat exchanger is used as a condenser, the indoor unit of the air conditioner is used as a heater in the heating mode, and when the indoor heat exchanger is used as an evaporator, the indoor unit of the air conditioner is used as a cooler in the cooling mode.

[0030] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings. As attached Figures 1 to 5As 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 the air conditioning fan is used to pass the air through the first indoor heat exchanger 600 and then through the air conditioning outlet to the indoor; the outdoor unit 200 is used to be arranged outdoors; the compressor 300 is arranged in the outdoor unit 200, and the compressor 300 is used to pump the 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; 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 a preset indoor temperature value.

[0031] In the prior art, the solution for removing formaldehyde is to set a filter module in the indoor unit 100 of the air conditioner. When the air containing formaldehyde in the room is circulated by the air conditioning wind, the formaldehyde in the air is adsorbed by the filter module to complete the formaldehyde removal. However, in this way, it is necessary to separately set a filter module inside the indoor unit 100, which increases a certain cost. In addition, after adding the filter module, the thickness of the indoor unit 100 also needs to be increased accordingly, and the materials used for the indoor unit 100 will also increase, increasing the cost of the whole machine. Moreover, although the filter module adsorbs formaldehyde, the filter module is still set in the indoor unit 100, and the formaldehyde is still in the room, so it will still affect the health of the user.

[0032] The present application adopts the above scheme, controls the second indoor heat exchanger 800 to be used as an evaporator to reduce the temperature of the second indoor heat exchanger 800, condenses water on the surface of the second indoor heat exchanger 800, dissolves the indoor formaldehyde in the condensed water, and discharges the indoor condensed water to the outside through the drain pipe, thereby achieving the effect of removing formaldehyde. In addition, the first indoor heat exchanger 600 is used to adjust the temperature of the air passing through the second indoor heat exchanger 800 to avoid the influence of the second indoor heat exchanger 800 on the indoor temperature, and ensure that the indoor temperature does not affect the thermal comfort of the user.

[0033] In some embodiments, the second throttle 900 and the first throttle 700 are further included. The second throttle 900 is used to control the pressure and temperature of the refrigerant entering the second indoor heat exchanger 800. The first throttle 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 900 and the first throttle 700, respectively.

[0034] In some embodiments, an outdoor heat exchanger 500 is further disposed 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 disposed between the second indoor heat exchanger 800 and the outdoor heat exchanger 500.

[0035] Please refer to Figure 4 In some embodiments, the first throttle 700 is disposed between the first indoor heat exchanger 600 and the outdoor heat exchanger 500, and the pressure and temperature of the refrigerant between the outdoor heat exchanger 500 and the first indoor heat exchanger 600 are adjusted by the first throttle 700 to adjust the temperature of the first indoor heat exchanger 600. The second throttle 900 is disposed between the first indoor heat exchanger 600 and the second indoor heat exchanger 800, and the second throttle 900 adjusts the pressure and temperature of the refrigerant between the first indoor heat exchanger 600 and the second indoor heat exchanger 800 to adjust the temperature of the second indoor heat exchanger 800.

[0036] 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, and the flow direction of the refrigerant can be adjusted by the four-way valve 400 to achieve switching between the heating mode and the cooling mode.

[0037] In the cooling mode, the compressor 300 outputs the refrigerant, and the refrigerant flows back to the compressor 300 after passing through the outdoor heat exchanger 500, the first indoor heat exchanger 600, and the second indoor heat exchanger 800 in sequence.

[0038] In the heating mode, the compressor 300 outputs the refrigerant, and the refrigerant flows back to the compressor 300 after passing through the second indoor heat exchanger 800 , the first indoor heat exchanger 600 , and the outdoor heat exchanger 500 in sequence.

[0039] 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 the second coil temperature value; Please refer to Figures 5 to 7The controller is configured to: control the indoor coil temperature sensor to obtain the second coil temperature value, determine the relationship between the second coil temperature value and the preset coil temperature value, and if the second coil temperature value is less than the preset coil temperature value, control the second throttling member 900 to increase the opening 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, it means that the temperature of the second indoor heat exchanger 800 is relatively low, so the pressure and temperature of the refrigerant passing through the second indoor heat exchanger 800 are increased through the second throttling member 900 to ensure that formaldehyde will not undergo polymerization reaction and ensure the effect of removing formaldehyde.

[0040] In some embodiments, the controller is configured to: if the second coil temperature value is less than the preset coil temperature value, increase the second opening increment based on the current opening of the second throttling member 900. The second opening increment is greater than zero, and the specific value of the second opening increment is selected according to demand.

[0041] In some embodiments, 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, and if the current return air dew point temperature difference is less than the preset return air dew point temperature difference, control the second throttle 900 to reduce the 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 can be generated on the second indoor heat exchanger 800 to ensure the effect of removing formaldehyde.

[0042] 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 the preset return air dew point temperature difference, then subtract the 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 according to the requirements.

[0043] 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 calculation formula for the return air dew point temperature is as follows: Where, Td is the dew point temperature, T is the indoor temperature, and RH is the indoor relative humidity.

[0044] In some embodiments, the return air dew point temperature difference is automatically calculated by computer software, or calculated and returned by the cloud.

[0045] 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.

[0046] In some embodiments, the controller is configured to maintain the current state if the current return air dew point temperature difference is greater than the preset return air dew point temperature difference.

[0047] In some embodiments, the controller is configured to determine the relationship between the second coil temperature value and the preset coil temperature value every first detection time, and re-detect every first detection time to ensure that the temperature of the second indoor heat exchanger 800 is in the correct range in real time.

[0048] 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 as to make the indoor temperature reach the preset indoor temperature value.

[0049] 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, and is maintained for a first preset time, so that the indoor temperature reaches the preset indoor temperature value.

[0050] In some embodiments, the controller is configured to control the second indoor heat exchanger 800 to be used as an evaporator while controlling the first indoor heat exchanger 600 to operate so that the indoor temperature reaches a preset indoor temperature value.

[0051] Please refer to Figures 5 to 10 In some embodiments, the air conditioner is adjusted according to the season. In summer, the air conditioner is controlled to enter the first mode for removing formaldehyde; in spring and autumn, the air conditioner is controlled to enter the second mode for removing formaldehyde; in winter, the air conditioner is controlled to enter the third mode for removing formaldehyde. The main difference between the first mode, the second mode and the third mode is that the preset coil temperature value and the preset indoor temperature value are different. The preset coil temperature value and the preset indoor temperature value are preset according to user needs, or are selected according to cloud data, or are preset when the air conditioner leaves the factory.

[0052] In some embodiments, the first mode, the second mode or the third mode of formaldehyde removal is selected according to instructions sent from the cloud, or the controller detects the season at the current time point and makes a selection.

[0053] 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.

[0054] Please refer to Figures 5 to 10In some embodiments, 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 throttle 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 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 700. When the return air temperature is greater than the second preset temperature, the temperature of the first indoor heat exchanger 600 is reduced by adjusting the first throttle 700.

[0055] In some embodiments, if the return air temperature is less than the first preset temperature, a first opening increment is added based on the current opening of the first throttle 700. The first opening increment is greater than zero, and the specific value of the first opening increment is selected according to the requirements.

[0056] In some embodiments, if the return air temperature value is greater than the second preset temperature value, 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 the requirements.

[0057] In some embodiments, if the return air temperature value is greater than the first preset temperature value and less than the second preset temperature value, the current state operation is maintained.

[0058] 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 according to cloud data, or are preset when the air conditioner leaves the factory.

[0059] 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.

[0060] Please refer to Figures 5 to 10In some embodiments, 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 300 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 300 is controlled to subtract the decrement frequency from the current operating frequency. 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 compressor 300. When the return air temperature is greater than the second preset temperature, the temperature of the first indoor heat exchanger 600 is reduced by adjusting the compressor 300.

[0061] In some embodiments, the increment frequency and the decrement frequency are selected according to requirements. Both the increment frequency and the decrement frequency are greater than zero.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] In some embodiments, 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. Detect whether the first indoor heat exchanger 600 reaches the preset temperature every second detection time, and adjust to ensure that the temperature of the first indoor heat exchanger 600 is within the correct range.

[0066] In some embodiments, the air conditioning fan has a first speed and a second speed, and the first speed is greater than the second speed; Please refer to Figures 5 to 10 The controller is configured to, before controlling the second indoor heat exchanger 800 to be used as an evaporator, control the air conditioner fan to operate at the first speed for a first duration, and then control the air conditioner fan to operate at the second speed. This method allows indoor formaldehyde to be evenly distributed in the indoor air, increases the latent heat ratio in the heat exchange amount, improves the heat exchange effect, and enhances the formaldehyde removal effect.

[0067] 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.

[0068] 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 exits the formaldehyde removal mode, if so, the formaldehyde removal mode is exited; if not, the current formaldehyde removal mode is re-circulated.

[0069] 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.

[0070] In some embodiments, an outdoor fan is disposed in the outdoor unit 200 , and the outdoor fan is used to blow air through the outdoor heat exchanger 500 to achieve heat exchange of the refrigerant in the outdoor heat exchanger 500 .

[0071] In some embodiments, the outdoor fan has a first outdoor speed, a second outdoor speed and a third outdoor speed. In the first mode of removing formaldehyde, the outdoor fan runs at the first outdoor speed. In the second mode of removing formaldehyde, the outdoor fan runs at the second outdoor speed. In the third mode of removing formaldehyde, the outdoor fan runs at the third outdoor speed.

[0072] In some embodiments, the first outdoor rotation speed is greater than the second outdoor rotation speed and greater than the third outdoor rotation speed.

[0073] In some embodiments, the first outdoor rotation speed, the second outdoor rotation speed and the third outdoor rotation speed are selected according to actual needs.

[0074] In some embodiments, the compressor 300 has a first frequency, a second frequency, and a third frequency. In the first mode of removing formaldehyde, the initial frequency of the compressor 300 is the first frequency. In the second mode of removing formaldehyde, the initial frequency of the compressor 300 is the second frequency. In the third mode of removing formaldehyde, the initial frequency of the compressor 300 is the third frequency.

[0075] In some embodiments, the second frequency is less than the third frequency.

[0076] In some embodiments, the first throttling member 700 is a first expansion valve, and the first expansion valve has a first opening and a second opening. The first opening is fully open, and the second opening is smaller than the first opening, and the second opening is selected according to actual needs.

[0077] In the first mode of removing formaldehyde, the initial opening degree of the first expansion valve is the second opening degree. In the second mode and the third mode of removing formaldehyde, the initial opening degree of the first expansion valve is the first opening degree.

[0078] 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.

[0079] In the first mode of formaldehyde removal, the initial opening of the second expansion valve is the third opening. In the second mode of formaldehyde removal, the initial opening of the second expansion valve is the fourth opening. In the third mode of formaldehyde removal, the initial opening of the second expansion valve is the fifth opening.

[0080] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An air conditioner, characterized in that: It includes: An indoor unit, wherein the indoor unit is provided with an air-conditioning air outlet and an air-conditioning air 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 is arranged between the first indoor heat exchanger and the air inlet of the air conditioner; An air conditioning fan, the air conditioning fan is arranged in the indoor unit, and the air conditioning fan is used to transport air through the second indoor heat exchanger, the first indoor heat exchanger and the air conditioning outlet to the indoor room; An outdoor unit, the outdoor unit is used to be 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 and the other end of which 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; The first indoor heat exchanger is controlled to operate so that the indoor temperature reaches a preset indoor temperature value.

2. The air conditioner according to claim 1, characterized in that: Also includes; a second throttling element, the second throttling element being used to control the pressure and temperature of the refrigerant entering the second indoor heat exchanger; The first throttling device is used to control the pressure and temperature of the refrigerant entering the first indoor heat exchanger.

3. The air conditioner according to claim 2, characterized in that: 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 the second coil temperature value; 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.

4. The air conditioner according to claim 3, characterized in that: 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 element to reduce the opening degree.

5. The air conditioner according to claim 4, characterized in that: 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.

6. The air conditioner according to claim 4, 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.

7. The air conditioner according to claim 6, characterized in that: The controller is configured to control the return air temperature sensor and 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 throttling element to increase its opening; If the return air temperature value is greater than the second preset temperature value, the first throttling member is controlled to reduce its opening degree.

8. The air conditioner according to claim 6, 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.

9. The air conditioner according to claim 8, 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.

10. The air conditioner according to any one of claims 1 to 5, characterized in that: The air conditioning fan has a first speed and a second speed, and the first speed is greater than the second speed; The controller is configured to, before controlling the second indoor heat exchanger to be used 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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