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, an air conditioner fan, an indoor heat exchanger, an air deflector, a fresh air fan and a controller, the indoor unit is provided with an air conditioner air outlet and an air conditioner air inlet; the air conditioner fan is arranged in the indoor unit; the indoor heat exchanger is arranged in the indoor unit; the air guide plate is arranged at the air conditioner air outlet, and the air guide plate turns over to be used for adjusting the air direction of air conditioner air passing through the air conditioner air outlet; the fresh air fan is arranged in the indoor unit, and the fresh air fan is used for feeding outdoor fresh air into a room and discharging formaldehyde out of the room; the controller is configured to enter a first stage, and the indoor heat exchanger is controlled to be used as a condenser, so that the indoor temperature reaches a first preset temperature value; entering a second stage after first preset time, and controlling the indoor heat exchanger to be used as an evaporator; and entering a third stage after a second preset time, controlling the indoor heat exchanger to be used as a condenser, and starting a fresh air fan at the same time.

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 conditioner is an air conditioner, which refers to a device that uses artificial means to adjust and control the temperature, humidity, flow rate and other parameters of the ambient air in a building or structure. 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 to remove formaldehyde. However, the air conditioner with an adsorption module has a complex structure and high cost. 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 heats up in the first stage to accelerate the release of formaldehyde, cools down in the second stage to generate condensation water on the indoor heat exchanger, and dissolves the formaldehyde in the air in the condensation water. In the third stage, the condensation water containing formaldehyde is heated up to evaporate, and the fresh air blower is turned on to discharge the indoor air containing formaldehyde to the outside, which does not require a separate adsorption module to remove formaldehyde, saving costs.

[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; An air-conditioning fan, the air-conditioning fan is arranged in the indoor unit, and the air-conditioning fan is used to transport air-conditioning wind to the room through the air-conditioning outlet; An indoor heat exchanger, the indoor heat exchanger is arranged in the indoor unit, and heat exchange is performed between the refrigerant flowing inside the indoor heat exchanger and the air to form a heating cycle or a cooling cycle, so as to increase or decrease the temperature of the air-conditioned air output to the room; An air guide plate, the air guide plate being arranged at the air outlet of the air conditioner, the air guide plate being turned over to adjust the wind direction of the air-conditioning wind passing through the air outlet of the air conditioner; A fresh air fan, which is arranged in the indoor unit and is used to send outdoor fresh air into the room and also to discharge formaldehyde to the outside; The controller is configured to: enter the first stage, control the indoor heat exchanger to be used as a condenser to make the indoor temperature reach a first preset temperature value; enter the second stage after the first preset time, control the indoor heat exchanger to be used as an evaporator; enter the third stage after the second preset time, control the indoor heat exchanger to be used as a condenser, and start the fresh air fan at the same time.

[0007] In the technical solution, the temperature is raised in the first stage and lowered in the second stage to generate condensation water on the indoor heat exchanger so that formaldehyde in the air is dissolved in the condensation water. In the third stage, the temperature is raised to evaporate the condensation water containing formaldehyde, and the fresh air fan is turned on to discharge the evaporated condensation water outdoors. It does not need to set up a separate adsorption module to remove formaldehyde, saving costs.

[0008] In some embodiments of the present application, the air conditioner further comprises: Outdoor unit; An outdoor heat exchanger, wherein the outdoor heat exchanger is disposed in the outdoor unit; A throttling device, the throttling device is used to control the refrigerant pressure and temperature of the outdoor heat exchanger and the indoor heat exchanger; An indoor temperature sensor is disposed at the air inlet of the air conditioner and is used to detect the indoor temperature to obtain an indoor temperature value; The controller is configured to: in the second stage, control the indoor temperature sensor to obtain the indoor 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 throttling element to reduce the opening.

[0009] In the technical solution, the current return air dew point temperature difference is calculated and the temperature of the indoor heat exchanger is adjusted to ensure that condensation water can be generated on the indoor heat exchanger.

[0010] In some embodiments of the present application, the current return air dew point temperature difference is the return air dew point temperature minus the temperature of the indoor heat exchanger.

[0011] In some embodiments of the present application, a compressor is provided in the outdoor unit, and the compressor is used to pump refrigerant into the outdoor heat exchanger or the indoor heat exchanger; The controller is configured to: enter a first transition phase after the first phase ends, and in the first transition phase, reduce the frequency of the compressor and maintain the frequency for a first transition time before entering a second phase.

[0012] In the technical solution, a first transition stage is provided between the first stage and the second stage, so that the indoor heat exchanger can smoothly switch from the condenser state to the evaporator working state.

[0013] In some embodiments of the present application, the controller is configured to: in the first stage, if the indoor temperature value does not reach the first preset temperature value, increase the frequency of the compressor.

[0014] In the technical solution, in the first stage, it is ensured that the indoor temperature value can reach a first preset temperature value to promote the release of indoor formaldehyde.

[0015] In some embodiments of the present application, a coil temperature sensor is provided in the indoor unit, and the coil temperature sensor is used to detect the temperature of the indoor heat exchanger coil to obtain the indoor heat exchanger coil temperature value; The controller is configured to: in the second stage, if the indoor heat exchanger coil temperature value is greater than the second preset temperature value, calculate the current return air dew point temperature difference; if the indoor heat exchanger coil temperature value is less than the second preset temperature value, increase the throttling device opening.

[0016] In the technical solution, when calculating the return air dew point temperature difference, it is first calculated whether the indoor heat exchanger temperature value is greater than the second preset temperature value, so as to adjust the temperature of the indoor heat exchanger to ensure that formaldehyde can be smoothly dissolved in the condensation water.

[0017] In some embodiments of the present application, the controller is configured to: enter a second transition phase after the second phase ends, and in the second transition phase, reduce the frequency of the compressor and maintain the second transition time before entering the third phase.

[0018] In the technical solution, a second transition stage is provided between the second stage and the third stage, so that the indoor heat exchanger can smoothly switch from the evaporator state to the condenser working state.

[0019] In some embodiments of the present application, the controller is configured to: in the third stage, if the temperature value of the indoor heat exchanger does not reach a third preset temperature value, increase the frequency of the compressor.

[0020] In the technical solution, in the third stage, it is ensured that the temperature value of the indoor heat exchanger can reach the third preset temperature value, and it is ensured that the condensed water on the indoor heat exchanger can be evaporated.

[0021] In some embodiments of the present application, the controller is configured to: in the third stage, control the air-conditioning fan and the air guide plate to close.

[0022] In the technical solution, avoid the air conditioning wind affecting the fresh air flow.

[0023] In some embodiments of the present application, the controller is configured to: in the second stage, control the air guide plate to supply air horizontally.

[0024] In the technical solution, in the second stage, the air guide plate supplies air horizontally to speed up the flow of indoor air and the precipitation rate of formaldehyde so that the formaldehyde can be dissolved in the condensation water on the indoor heat exchanger.

[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 indoor unit according to an embodiment of the present application; Figure 2 is a front view of an indoor unit according to an embodiment of the present application; Figure 3 is a schematic diagram of the overall structure of an air conditioner according to an embodiment of the present application; Figure 4 is a working flow chart 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. 9 is a working flow chart of an air conditioner according to an embodiment of the present application; Fig.10 is a working flow chart of an air conditioner according to an embodiment of the present application; Fig.11 is a structural schematic diagram of an air conditioner according to an embodiment of the present application; Fig.12 It is a cross-sectional view of an indoor unit according to an embodiment of the present application.

[0027] In the above figures: 100, indoor unit; 101, air inlet of air conditioner; 102, air outlet of air conditioner; 200, outdoor unit; 300, compressor; 400, four-way valve; 500, throttling device; 600, outdoor heat exchanger; 700, indoor heat exchanger. 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, an outdoor heat exchanger, an expansion valve and an indoor heat exchanger. The refrigeration cycle includes a series of processes involving compression, condensation, throttling and evaporation. 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. The indoor heat exchanger evaporates the refrigerant throttled in the expansion valve and returns the refrigerant gas in a low temperature and low pressure state to the compressor. The indoor heat exchanger can achieve a 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 expansion valve, the compressor and the outdoor heat exchanger, and the indoor unit of the air conditioner includes the indoor heat exchanger. The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner indoor unit functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner indoor unit functions as a cooler in a 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 4 As shown, in an exemplary embodiment of the air conditioner of the present invention, the air conditioner includes: an indoor unit 100, an air conditioning fan, an indoor heat exchanger 700, an air guide plate, a fresh air fan and a controller, wherein the indoor unit 100 is provided with an air conditioning outlet 102 and an air conditioning inlet 101; the air conditioning fan is arranged in the indoor unit 100, and the air conditioning fan is used to deliver the air conditioning wind to the room through the air conditioning outlet 102; the indoor heat exchanger 700 is arranged in the indoor unit 100, and the refrigerant flowing in the indoor heat exchanger 700 and the air perform heat exchange to form a heating cycle or a refrigeration cycle to increase or decrease the temperature of the air conditioning wind output to the room; the air guide plate is arranged at the air conditioning outlet 102, and the air guide plate is turned over to adjust the wind direction of the air conditioning wind passing through the air conditioning outlet 102; the fresh air fan is arranged in the indoor unit 100, and the fresh air fan is used to deliver the outdoor fresh air into the room, and also to discharge formaldehyde to the outside; The controller is configured as follows: when entering the first stage, the indoor heat exchanger 700 is controlled to be used as a condenser so that the indoor temperature reaches a first preset temperature value; after the first preset time, the second stage is entered, the indoor heat exchanger 700 is controlled to be used as an evaporator; after the second preset time, the third stage is entered, the indoor heat exchanger 700 is controlled to be used as a condenser, and the fresh air fan is turned on at the same time.

[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 uses the above scheme to increase the temperature in the first stage to accelerate the release of indoor formaldehyde, and to reduce the temperature in the second stage to generate condensation water on the indoor heat exchanger 700 so that the formaldehyde in the air is dissolved in the condensation water. In the third stage, the temperature is increased to evaporate the condensation water containing formaldehyde, and the fresh air fan is turned on to discharge the evaporated condensation water outdoors. It does not need to set up a separate adsorption module to remove formaldehyde, saving costs.

[0033] In some embodiments, a compressor 300 is disposed in the outdoor unit 200 , and the compressor 300 is used to pump the refrigerant into the outdoor heat exchanger 600 or the indoor heat exchanger 700 .

[0034] Please refer to Figure 6 In some embodiments, the controller is configured to: in the first stage, control the air guide plate to swing longitudinally. In the first stage, the air guide plate sends air downward to speed up the flow of indoor airflow, so that the indoor temperature can rise quickly.

[0035] In some embodiments, the air conditioner also includes: an outdoor unit 200, an outdoor heat exchanger 600, a throttling device 500 and an indoor temperature sensor, wherein the outdoor unit 200 is used to be hung outdoors; the outdoor heat exchanger 600 is arranged in the outdoor unit 200; the throttling device 500 is used to control the refrigerant pressure and temperature between the outdoor heat exchanger 600 and the indoor heat exchanger 700; the indoor temperature sensor is arranged at the air inlet 101 of the air conditioner and is used to detect the indoor temperature to obtain the indoor temperature value.

[0036] In some embodiments, the controller is configured to: in the first stage, if the indoor temperature value does not reach the first preset temperature value, increase the frequency of the compressor 300. In the first stage, it is ensured that the indoor temperature value can reach the first preset temperature value, so that more formaldehyde can be dissolved in the condensed water in the second stage.

[0037] Please refer to Figure 6In some embodiments, the controller is configured to: in the first stage, detect the indoor temperature value through the indoor temperature sensor and compare it with the first preset temperature value. If the indoor temperature value is lower than the first preset temperature value, increase the incremental frequency on the current operating frequency of the compressor 300. If the indoor temperature value is higher than or equal to the first preset temperature value, keep running in this state. Repeat the above actions every first detection time interval.

[0038] In some embodiments, a coil temperature sensor is provided in the indoor unit 100, and the coil temperature sensor is used to detect the temperature of the indoor heat exchanger 700 to obtain the coil temperature value of the indoor heat exchanger 700. The controller is configured to: in the first stage, obtain the coil temperature value of the indoor heat exchanger 700; calculate the temperature value that the indoor heat exchanger 700 should reach when the indoor temperature reaches the first preset temperature value, compare the temperature value with the coil temperature value of the indoor heat exchanger 700, and if it is lower than the first preset temperature value, increase the incremental frequency on the current working frequency of the compressor 300. If it is higher than the first preset temperature value, keep running in this state. Repeat the above actions at intervals of the first detection time.

[0039] Please refer to Figures 5 to 7 In some embodiments, the controller is configured to: enter the first transition stage after the first stage, and in the first transition stage, reduce the frequency of the compressor 300 and maintain the first transition time before entering the second stage. A first transition stage is provided between the first stage and the second stage so that the indoor heat exchanger can smoothly switch from the condenser state to the evaporator working state. In the first stage, the heating mode needs to be switched to the cooling mode in the second stage. In order to ensure the smooth reversal of the four-way valve, the frequency of the compressor 300 is reduced in the first transition stage.

[0040] In some embodiments, the compressor 300 has a first frequency and a second frequency, the first frequency being greater than the second frequency. The controller is configured to control the compressor 300 to operate at the first frequency in the first stage, and to control the compressor 300 to operate at the second frequency in the first transition stage.

[0041] Please refer to Figures 7 to 9 In some embodiments, the controller is configured to: in the second stage, if the indoor heat exchanger coil temperature value is greater than the second preset temperature value, calculate the current return air dew point temperature difference; if the indoor heat exchanger coil temperature value is less than or equal to the second preset temperature value, increase the throttling device opening. When calculating the return air dew point temperature difference, first calculate whether the indoor heat exchanger coil temperature value is greater than the second preset temperature value, and adjust the temperature of the indoor heat exchanger to ensure that condensation water can be generated on the indoor heat exchanger.

[0042] In some embodiments, the controller is configured to: in the second stage, control the coil temperature sensor to obtain the indoor heat exchanger coil temperature value, compare the indoor coil temperature value with the second preset temperature value, and if the indoor coil temperature value is less than or equal to the second preset temperature value, increase the throttling device opening. If the indoor coil temperature value is greater than the second preset 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 throttling device 500 to reduce the opening. If the current return air dew point temperature difference is greater than or equal to the preset return air dew point temperature difference, maintain the current working state. Repeat the above actions at intervals of the second detection time.

[0043] The current return air dew point temperature difference is calculated and the temperature of the indoor heat exchanger 700 is adjusted to ensure that condensation water can be generated on the indoor heat exchanger 700.

[0044] In some embodiments, the current return air dew point temperature difference is the return air dew point temperature minus the temperature of the indoor heat exchanger 700. 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.

[0045] In some embodiments, the return air dew point temperature difference is automatically calculated by computer software, or calculated and returned by the cloud.

[0046] In some embodiments, the throttling member 500 is an expansion valve.

[0047] Please refer to Figures 6 to 9 In some embodiments, the controller is configured to: control horizontal air supply in the second stage. In the second stage, the air guide plate supplies air horizontally to form a good air flow organization indoors, so that more formaldehyde in the room can be dissolved in the condensed water on the indoor heat exchanger 700.

[0048] In some embodiments, in the second stage, the speed of the air conditioning fan is less than the speed in the first stage and the first transition stage. The air conditioning fan includes a first air conditioning speed, a second air conditioning speed, and a third air conditioning speed. Among them, the first air conditioning speed and the second air conditioning speed are both greater than the third air conditioning speed. And the first air conditioning speed and the second air conditioning speed can be the same. The controller is configured to: in the first stage, control the air conditioning fan to run at the first air conditioning speed; in the first transition stage; control the air conditioning fan to run at the second air conditioning speed; in the third stage, control the air conditioning fan to run at the third air conditioning speed.

[0049] In some embodiments, at the initial state of the second stage, the indoor coil temperature is at least 1° C. greater than the second preset temperature.

[0050] Please refer to Figures 6 to 9 In some embodiments, the controller is configured to: enter the second transition stage after the second stage, and in the second transition stage, reduce the frequency of the compressor 300 and maintain the second transition time before entering the third stage. A second transition stage is provided between the second stage and the third stage so that the indoor heat exchanger can smoothly switch from the evaporator state to the condenser working state. The second stage needs to switch the cooling mode to the heating mode of the third stage, so in the second transition stage, the frequency of the compressor 300 is reduced to ensure smooth switching of the four-way valve.

[0051] In some embodiments, the compressor 300 further has a third frequency and a fourth frequency. The fourth frequency is lower than the third frequency, and the third frequency may be the same as the first frequency.

[0052] In some embodiments, during the second transition stage, the air conditioning fan operates at a third air conditioning speed.

[0053] In some embodiments, the controller is configured to: in the third stage, if the coil temperature value of the indoor heat exchanger 700 does not reach the third preset temperature value, increase the frequency of the compressor 300. In the third stage, it is ensured that the coil temperature value of the indoor heat exchanger 700 can reach the third preset temperature value, and the condensed water on the indoor heat exchanger 700 can be evaporated.

[0054] Please refer to Fig.10 In some embodiments, the controller is configured to: in the third stage, the coil temperature value of the indoor heat exchanger 700 is detected by the coil temperature sensor and compared with the third preset temperature value. If the coil temperature value of the indoor heat exchanger 700 is lower than the third preset temperature value, the incremental frequency is increased on the current operating frequency of the compressor 300. If the coil temperature value of the indoor heat exchanger 700 is higher than or equal to the third preset temperature value, the state operation is maintained. The above actions are repeated every third detection time interval.

[0055] In some embodiments, the controller is configured to: in the third stage, control the air conditioning fan to be turned off. At this time, there is no need to heat the room, and only the condensed water on the indoor heat exchanger 700 needs to be heated and evaporated. Therefore, the air conditioning fan is not turned on. In addition, the air conditioning fan is turned off to prevent the air flow from passing through the indoor heat exchanger 700 and taking away the heat of the indoor heat exchanger 700, so that the indoor heat exchanger 700 can be heated quickly, the evaporation effect is improved, and the efficiency is improved.

[0056] In some embodiments, the third preset temperature value is sufficient to allow condensed water to evaporate. In order to improve efficiency, the third preset temperature value is the maximum value that the indoor heat exchanger 700 can reach.

[0057] In some embodiments, in the present application, condensation of condensed water on the indoor heat exchanger 700 can be achieved as long as the current return air dew point temperature difference in the second stage is greater than or equal to the preset return air dew point temperature difference.

[0058] Please refer to Fig.11 In some embodiments, the compressor 300 has two connection ends, which are respectively connected to and communicate with the indoor heat exchanger 700 and the outdoor heat exchanger 600. The ends of the outdoor heat exchanger 600 and the indoor heat exchanger 700 away from the compressor 300 are connected and communicated with each other through a throttling member.

[0059] In some embodiments, the throttle 500 is disposed between the indoor heat exchanger 700 and the outdoor heat exchanger 600, and the refrigerant pressure and temperature in the outdoor heat exchanger 600 and the indoor heat exchanger 700 are adjusted by the throttle 500. A four-way valve 400 is disposed between the compressor 300 and the outdoor heat exchanger 600, or between the compressor 300 and the indoor heat exchanger 700, 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.

[0060] If the indoor heat exchanger 700 is used as a condenser, the outdoor heat exchanger 600 is used as an evaporator, and the air conditioner is in heating mode. The refrigerant is output from the compressor 300 and enters the outdoor heat exchanger 600 after dissipating heat through the indoor heat exchanger 700. The refrigerant absorbs heat in the outdoor heat exchanger 600 and circulates to the compressor 300. By adjusting the opening of the throttle 500, the refrigerant pressure and temperature in the indoor heat exchanger 700 and the outdoor heat exchanger 600 can be adjusted to increase or decrease the heating effect.

[0061] If the indoor heat exchanger 700 is used as an evaporator, the outdoor heat exchanger 600 is used as a condenser. At this time, the air conditioner is in cooling mode, and the refrigerant is output from the compressor 300 and enters the outdoor heat exchanger 600 to release heat. The refrigerant passing through the outdoor heat exchanger 600 flows back to the compressor 300 through the throttling device 500 and the indoor heat exchanger 700. By adjusting the opening of the throttling device 500, the refrigerant pressure and temperature in the indoor heat exchanger 700 and the outdoor heat exchanger 600 can be adjusted to increase or decrease the cooling effect.

[0062] Please refer to Fig.12 In some embodiments, the air inlet 101 of the air conditioner is opened at the top of the indoor unit 100. The airflow enters the indoor unit 100 through the air inlet 101 at the top. The indoor temperature sensor is arranged at the air inlet 101 of the air conditioner, and the indoor temperature value detected by the indoor temperature sensor of the air conditioner is also the return air temperature value of the air conditioner.

[0063] In some embodiments, an outdoor fan is provided in the outdoor unit, and the outdoor fan blows air through the outdoor heat exchanger 500 to achieve heat exchange of the refrigerant. In the first stage, the first transition stage, the second stage, the second transition stage and the third stage, the outdoor fan operates according to the optimal speed calculated by the system.

[0064] In some embodiments, the first air-conditioning speed of the air-conditioning fan is greater than the third air-conditioning speed, and the second air-conditioning speed is greater than the third air-conditioning speed.

[0065] Please refer to Fig.10 In summary, the control in the present application is configured as follows: after entering the formaldehyde removal mode, the first stage is entered, the indoor heat exchanger 700 is controlled to be used as a condenser so that the indoor temperature reaches a first preset temperature value; at the same time, the air guide plate is controlled to supply air downward; the air conditioner fan is controlled to operate at a first air conditioner speed; the compressor 300 is controlled to operate at a first frequency; The indoor temperature value is detected by the indoor temperature sensor and compared with the first preset temperature value. If the indoor temperature value is lower than the first preset temperature value, the incremental frequency is increased on the current operating frequency of the compressor 300. If the indoor temperature value is higher than or equal to the first preset temperature value, the current state operation is maintained. The above actions are repeated at intervals of the first detection time.

[0066] After a first preset time, the first stage enters a first transition stage. In the first transition stage, the air-conditioning fan is controlled to operate at a second air-conditioning speed, and the compressor 300 is controlled to operate at a second frequency and maintain the first transition time before entering the second stage.

[0067] In the second stage, the indoor heat exchanger 700 is controlled to be used as an evaporator; the air guide plate is controlled to supply air horizontally; the air conditioner fan is controlled to operate at a third air conditioner speed; and the compressor 300 is controlled to operate at a third frequency. The control coil temperature sensor obtains the indoor coil temperature value, and compares the indoor coil temperature value with the second preset temperature value. If the indoor coil temperature value is less than or equal to the second preset temperature value, the throttling device opening is increased. If the indoor coil temperature value is greater than the second preset 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, the throttling device 500 is controlled to reduce the opening. If the current return air dew point temperature difference is greater than or equal to the preset return air dew point temperature difference, the current working state is maintained. Repeat the above actions at every second detection time interval; After the second preset time, the second stage enters the second transition stage. In the second transition stage, the air-conditioning fan is controlled to operate at the third air-conditioning speed, and the compressor 300 is controlled to operate at the fourth frequency and maintain the second transition time before entering the third stage. In the third stage, the indoor heat exchanger 700 is controlled to be used as a condenser, and the fresh air fan is turned on and the air conditioning fan is turned off; The indoor coil temperature value is detected by the coil temperature sensor and compared with the third preset temperature value. If the indoor coil temperature value is lower than the third preset temperature value, the incremental frequency is increased on the current operating frequency of the compressor 300. If the indoor coil temperature value is greater than or equal to the third preset temperature value, the current state operation is maintained. The above actions are repeated every third detection time interval.

[0068] After the third stage lasts for a third preset time, if the user does not turn off the formaldehyde removal mode, the first stage will be re-entered and cycled until the user exits the formaldehyde removal mode.

[0069] Among them, the first preset time, the second preset time, the third preset time, the first transition time, the second transition time, the first detection time, the second detection time and the third detection time are all set according to needs, and can be changed according to the indoor area, user settings, heat exchange efficiency, etc.

[0070] 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; An air-conditioning fan, the air-conditioning fan is arranged in the indoor unit, and the air-conditioning fan is used to transport air-conditioning wind to the room through the air-conditioning outlet; An indoor heat exchanger, the indoor heat exchanger is arranged in the indoor unit, and heat exchange is performed between the refrigerant flowing inside the indoor heat exchanger and the air to form a heating cycle or a cooling cycle, so as to increase or decrease the temperature of the air-conditioned air output to the room; An air guide plate, the air guide plate being arranged at the air outlet of the air conditioner, the air guide plate being turned over to adjust the wind direction of the air-conditioning wind passing through the air outlet of the air conditioner; A fresh air fan, which is arranged in the indoor unit and is used to send outdoor fresh air into the room and also to discharge formaldehyde to the outside; The controller is configured to: enter the first stage, control the indoor heat exchanger to be used as a condenser, so that the indoor temperature reaches a first preset temperature value; After the first preset time, the second stage is entered, and the indoor heat exchanger is controlled to be used as an evaporator; after the second preset time, the third stage is entered, and the indoor heat exchanger is controlled to be used as a condenser, and the fresh air fan is turned on at the same time.

2. The air conditioner according to claim 1, characterized in that: The air conditioner also includes: Outdoor unit; An outdoor heat exchanger, wherein the outdoor heat exchanger is disposed in the outdoor unit; A throttling device, the throttling device is used to control the refrigerant pressure and temperature of the outdoor heat exchanger and the indoor heat exchanger; An indoor temperature sensor is disposed at the air inlet of the air conditioner and is used to detect the indoor temperature to obtain an indoor temperature value; The controller is configured to: in the second stage, control the indoor temperature sensor to obtain the indoor 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 throttling element to reduce the opening.

3. The air conditioner according to claim 2, characterized in that: The current return air dew point temperature difference is the return air dew point temperature minus the temperature of the indoor heat exchanger coil.

4. The air conditioner according to claim 2, characterized in that: The outdoor unit is provided with a compressor, and the compressor is used to pump refrigerant into the outdoor heat exchanger or the indoor heat exchanger; The controller is configured to: enter a first transition phase after the first phase ends, and in the first transition phase, reduce the frequency of the compressor and maintain the frequency for a first transition time before entering a second phase.

5. The air conditioner according to claim 4, characterized in that: The controller is configured to increase the frequency of the compressor if the indoor temperature value does not reach a first preset temperature value in a first stage.

6. The air conditioner according to claim 5, characterized in that: The indoor unit is provided with a coil temperature sensor, which is used to detect the temperature of the indoor heat exchanger coil to obtain the indoor heat exchanger coil temperature value; The controller is configured to: in the second stage, if the indoor heat exchanger coil temperature value is greater than the second preset temperature value, calculate the current return air dew point temperature difference; if the indoor heat exchanger coil temperature value is less than the second preset temperature value, increase the throttling device opening.

7. The air conditioner according to claim 6, characterized in that: The controller is configured to: enter a second transition phase after the second phase ends, and in the second transition phase, reduce the frequency of the compressor and maintain the frequency for a second transition time before entering a third phase.

8. The air conditioner according to claim 7, characterized in that: The controller is configured to increase the frequency of the compressor if the indoor heat exchanger coil temperature value does not reach a third preset temperature value in the third stage.

9. The air conditioner according to any one of claims 1 to 8, characterized in that: The controller is configured to control the air conditioning fan and the air guide plate to be closed in the third stage.

10. The air conditioner according to claim 9, characterized in that: The controller is configured to control the air guide plate to supply air horizontally during the second stage.

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