air conditioner

Abstract

The present invention relates to an air conditioner, which belongs to the technical field of air conditioners. The air conditioner comprises: an indoor unit, an air-conditioning fan, an indoor heat exchanger, an air guide plate, a fresh air fan and a controller, wherein the indoor unit is provided with an air-conditioning outlet and an air-conditioning inlet; the air-conditioning 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-conditioning outlet, and the air guide plate is flipped to adjust the wind direction of the air-conditioning wind passing through the air-conditioning outlet; the fresh air fan is arranged in the indoor unit, and the fresh air fan is used to send outdoor fresh air into the room and also to discharge formaldehyde to the outside; the controller is configured as follows: entering the first stage, controlling the indoor heat exchanger to be used as a condenser to make the indoor temperature reach a first preset temperature value; entering the second stage after the first preset time, controlling the indoor heat exchanger to be used as an evaporator; entering the third stage after the second preset time, controlling the indoor heat exchanger to be used as a condenser, and turning on the 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] As people's quality of life improves, health is becoming an increasingly important factor in the home. In the home appliance market, more and more appliances are being developed around the theme of "health." Formaldehyde has become the number one killer affecting health in the home, and more and more users are seeking reliable and effective methods to remove it. As a Class I carcinogen, formaldehyde is widely present in home improvement materials such as furniture, walls, and flooring. Its release is long-lasting and slow, with some well-encapsulated home improvement materials releasing formaldehyde for nearly 10 years. Currently, no mature technology can completely remove formaldehyde from home improvement materials in a short period of time.

[0003] An air conditioner, or air conditioner, is a device that manually adjusts and controls the temperature, humidity, flow rate, and other parameters of the ambient air within a building or structure. Air conditioners typically consist of indoor and outdoor units. Most air conditioners lack the ability to remove formaldehyde from indoor air, causing it to continue to harm the human body. Air conditioners that do have formaldehyde removal capabilities use an adsorption module to reduce formaldehyde in indoor air. This module typically contains activated carbon or other adsorbent materials. However, air conditioners equipped with adsorption modules are complex and costly. Summary of the Invention

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

[0005] To this end, the present application aims to provide an air conditioner that, in the first stage, heats up to accelerate the release of formaldehyde, and in the second stage, cools down to generate condensation on the indoor heat exchanger, thereby dissolving the formaldehyde in the air. In the third stage, heat is increased to evaporate the condensation containing formaldehyde, and the fresh air blower is activated to exhaust the indoor air containing formaldehyde outdoors. This eliminates the need for a separate adsorption module to remove formaldehyde, thus saving costs.

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

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

[0008] An air-conditioning fan, the air-conditioning fan being arranged in the indoor unit and being used for delivering air-conditioning air into the room through the air-conditioning outlet;

[0009] An indoor heat exchanger is disposed in the indoor unit and performs heat exchange between the refrigerant flowing inside the indoor heat exchanger and the air to form a heating cycle or a cooling cycle, thereby increasing or decreasing the temperature of the conditioned air output to the room;

[0010] An air guide plate is provided at the air outlet of the air conditioner, and the air guide plate is flipped to adjust the direction of the air conditioning air passing through the air outlet of the air conditioner;

[0011] A fresh air fan is provided in the indoor unit and is used to deliver outdoor fresh air into the room and also to discharge formaldehyde to the outside;

[0012] 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 turn on the fresh air blower at the same time.

[0013] In this technical solution, the temperature is raised in the first stage and lowered in the second stage to generate condensation on the indoor heat exchanger, dissolving formaldehyde in the air. In the third stage, the temperature is raised to evaporate the condensation containing formaldehyde, and the fresh air blower is activated to discharge the evaporated condensation outdoors. This eliminates the need for a separate adsorption module to remove formaldehyde, saving costs.

[0014] In some embodiments of the present application, the air conditioner further includes:

[0015] Outdoor unit;

[0016] an outdoor heat exchanger, the outdoor heat exchanger being disposed in the outdoor unit;

[0017] 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;

[0018] An indoor temperature sensor is provided at the air inlet of the air conditioner and is used to detect the indoor temperature to obtain an indoor temperature value;

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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;

[0023] The controller is configured to: enter a first transition phase after the first phase ends; in the first transition phase, reduce the frequency of the compressor and maintain it for a first transition time before entering a second phase.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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;

[0028] 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.

[0029] 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, and the temperature of the indoor heat exchanger is adjusted to ensure that formaldehyde can be smoothly dissolved in the condensation water.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] In the technical solution, avoid the air conditioning wind affecting the fresh air flow.

[0036] 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.

[0037] In the technical solution, in the second stage, the air guide plate supplies air horizontally to accelerate 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.

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

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

[0040] Figure 2 is a front view of an indoor unit according to an embodiment of the present application;

[0041] Figure 3 is a schematic diagram of the overall structure of an air conditioner according to an embodiment of the present application;

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

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

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

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

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

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

[0048] Figure 10 is a flowchart of an air conditioner according to an embodiment of the present application;

[0049] Figure 11 is a structural schematic diagram of an air conditioner according to an embodiment of the present application;

[0050] Figure 12 It is a cross-sectional view of an indoor unit according to an embodiment of the present application.

[0051] 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

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0053] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; direct connections or indirect connections through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0054] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0055] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0056] The present invention is described in detail below by way of exemplary embodiments, but it should be understood that elements, structures, and features of one embodiment may be beneficially combined in other embodiments without further description.

[0057] In this application, the air conditioner performs a refrigeration cycle using a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger. The refrigeration cycle includes a series of processes, including compression, condensation, throttling, and evaporation. The compressor compresses low-temperature, low-pressure refrigerant gas and discharges high-temperature, high-pressure refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, releasing heat to the surrounding environment through the condensation process. The expansion valve throttles the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure, gas-liquid two-phase refrigerant. The indoor heat exchanger evaporates the refrigerant throttled by the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The indoor heat exchanger achieves cooling by utilizing the refrigerant's latent heat of vaporization to exchange heat with the material to be cooled. Throughout the entire cycle, the air conditioner's indoor unit regulates the temperature of the indoor space. The air conditioner's outdoor unit refers to the portion of the refrigeration cycle that includes the expansion valve, compressor, and outdoor heat exchanger, while the air conditioner's indoor unit 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 heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner indoor unit functions as a cooler in cooling mode.

[0058] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0059] 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 air into 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 performs heat exchange with the air to form a heating cycle or a cooling cycle, so as to increase or decrease the temperature of the air-conditioning air output to the room; the air guide plate is arranged at the air-conditioning outlet 102, and the air guide plate is flipped to adjust the wind direction of the air-conditioning air 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 outdoor fresh air into the room and also to discharge formaldehyde to the outside;

[0060] The controller is configured to: enter the first stage, control the indoor heat exchanger 700 to be used as a condenser to make the indoor temperature reach the first preset temperature value; enter the second stage after the first preset time, control the indoor heat exchanger 700 to be used as an evaporator; enter the third stage after the second preset time, control the indoor heat exchanger 700 to be used as a condenser, and turn on the fresh air blower at the same time.

[0061] In the prior art, the solution for removing formaldehyde is to install a filter module in the air-conditioning indoor unit 100. When the air-conditioning wind circulates the indoor air containing formaldehyde, the formaldehyde in the air is adsorbed by the filter module, completing the formaldehyde removal. However, this method requires a separate filter module to be installed inside the indoor unit 100, which increases the cost. In addition, after adding the filter module, the thickness of the indoor unit 100 also needs to be increased accordingly, and the material used for the indoor unit 100 will also increase, increasing the cost of the entire unit. Moreover, although the filter module adsorbs the formaldehyde, the filter module is still installed in the indoor unit 100, and the formaldehyde is still in the room, so it will still affect the health of the user.

[0062] This application utilizes the above-described solution to increase the temperature in the first stage to accelerate the release of indoor formaldehyde, and to cool the room in the second stage to generate condensation water on the indoor heat exchanger 700, thereby dissolving the formaldehyde in the air. In the third stage, the temperature is increased to evaporate the condensation water containing formaldehyde, and the fresh air blower is activated to discharge the evaporated condensation water outdoors. This eliminates the need for a separate adsorption module to remove formaldehyde, thus saving costs.

[0063] In some embodiments, a compressor 300 is provided 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 .

[0064] 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 blows air downward to accelerate the flow of indoor airflow and quickly increase the indoor temperature.

[0065] 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.

[0066] In some embodiments, the controller is configured to increase the frequency of the compressor 300 if the indoor temperature does not reach the first preset temperature value in the first stage. This ensures that the indoor temperature reaches the first preset temperature value in the first stage, thereby allowing more formaldehyde to dissolve in the condensed water in the second stage.

[0067] Please refer to Figure 6In some embodiments, the controller is configured to: in a first stage, detect the indoor temperature value via the indoor temperature sensor and compare it with a first preset temperature value. If the indoor temperature value is lower than the first preset temperature value, increase the incremental frequency of the current operating frequency of the compressor 300. If the indoor temperature value is higher than or equal to the first preset temperature value, maintain the current operating state. Repeat the above steps at intervals of a first detection time.

[0068] In some embodiments, the indoor unit 100 is equipped with a coil temperature sensor for detecting 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 a 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 a first preset value; compare this temperature value with the coil temperature value of the indoor heat exchanger 700; and if the temperature value is lower than the first preset value, increase the incremental frequency of the current operating frequency of the compressor 300. If the temperature value is higher than the first preset value, maintain the current operating state. This process is repeated at intervals of a first detection time.

[0069] Please refer to Figures 5 to 7 In some embodiments, the controller is configured to enter a first transition phase after the first phase. During the first transition phase, the frequency of the compressor 300 is reduced and maintained for a first transition time before entering the second phase. A first transition phase is provided between the first and second phases to allow the indoor heat exchanger to smoothly transition from a condenser to an evaporator. The first phase requires switching from heating mode to cooling mode in the second phase. To ensure smooth switching of the four-way valve, the frequency of the compressor 300 is reduced during the first transition phase.

[0070] 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 during the first stage and to control the compressor 300 to operate at the second frequency during the first transition stage.

[0071] 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 is greater than a second preset temperature value, calculate the current return air dew point temperature difference; if the indoor heat exchanger coil temperature is less than or equal to the second preset temperature value, increase the throttle opening. When calculating the return air dew point temperature difference, the controller first determines whether the indoor heat exchanger coil temperature is greater than the second preset temperature value. Based on this, the indoor heat exchanger temperature is adjusted to ensure that condensation can form on the indoor heat exchanger.

[0072] 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 a second preset temperature value, and increase the throttle opening if the indoor coil temperature value is less than or equal to the second preset temperature value. If the indoor coil temperature value is greater than the second preset 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 throttle opening 500 to decrease. 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 operating state. This process is repeated at intervals of the second detection time.

[0073] By calculating the current return air dew point temperature difference and adjusting the temperature of the indoor heat exchanger 700, it is ensured that condensation water can be generated on the indoor heat exchanger 700.

[0074] 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 return air dew point temperature is calculated as follows:

[0075]

[0076]

[0077] Where Td is the dew point temperature, T is the indoor temperature, and RH is the indoor relative humidity.

[0078] In some embodiments, the return air dew point temperature difference is automatically calculated by computer software, or calculated and returned via the cloud.

[0079] In some embodiments, the throttling member 500 is an expansion valve.

[0080] Please refer to Figures 6 to 9 In some embodiments, the controller is configured to control horizontal air supply during the second stage. In the second stage, the air guide plate supplies air horizontally, forming 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.

[0081] In some embodiments, during the second stage, the air conditioning fan speed is less than the speed during 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. Both the first air conditioning speed and the second air conditioning speed are greater than the third air conditioning speed. Furthermore, the first air conditioning speed and the second air conditioning speed may be the same. The controller is configured to: during the first stage, control the air conditioning fan to operate at the first air conditioning speed; during the first transition stage, control the air conditioning fan to operate at the second air conditioning speed; and during the third stage, control the air conditioning fan to operate at the third air conditioning speed.

[0082] 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.

[0083] Please refer to Figures 6 to 9 In some embodiments, the controller is configured to enter a second transition phase after the second phase. During the second transition phase, the frequency of the compressor 300 is reduced and maintained for a second transition time before entering the third phase. A second transition phase is provided between the second and third phases to allow the indoor heat exchanger to smoothly transition from an evaporator to a condenser. The second phase requires switching from the cooling mode to the third phase's heating mode. Therefore, during the second transition phase, the frequency of the compressor 300 is reduced to ensure smooth switching of the four-way valve.

[0084] 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.

[0085] In some embodiments, during the second transition stage, the air-conditioning fan operates at a third air-conditioning speed.

[0086] In some embodiments, the controller is configured to increase the frequency of the compressor 300 if the coil temperature of the indoor heat exchanger 700 has not reached a third preset temperature value during the third stage. This ensures that the coil temperature of the indoor heat exchanger 700 reaches the third preset temperature value during the third stage, thereby ensuring that condensed water on the indoor heat exchanger 700 can evaporate.

[0087] Please refer to Figure 10 In some embodiments, the controller is configured to: In the third stage, the coil temperature sensor detects the coil temperature of the indoor heat exchanger 700 and compares it with a third preset temperature value. If the coil temperature of the indoor heat exchanger 700 is lower than the third preset temperature value, the incremental frequency is increased to the current operating frequency of the compressor 300. If the coil temperature of the indoor heat exchanger 700 is higher than or equal to the third preset temperature value, the current operating state is maintained. The above steps are repeated at intervals of a third detection time.

[0088] In some embodiments, the controller is configured to control the air conditioning fan to shut down during the third stage. During this stage, the indoor temperature does not need to be raised; only condensation on the indoor heat exchanger 700 needs to be heated and evaporated. Therefore, the air conditioning fan is not turned on. Furthermore, shutting down the air conditioning fan prevents airflow through the indoor heat exchanger 700 from removing heat from the indoor heat exchanger 700. This allows the indoor heat exchanger 700 to heat up quickly, improving evaporation efficiency and boosting efficiency.

[0089] In some embodiments, the third preset temperature value is sufficient to allow condensed water to evaporate. To improve efficiency, the third preset temperature value is the maximum value that the indoor heat exchanger 700 can reach.

[0090] 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.

[0091] Please refer to Figure 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 device.

[0092] In some embodiments, a throttle element 500 is disposed between the indoor heat exchanger 700 and the outdoor heat exchanger 600, and the throttle element 500 regulates the refrigerant pressure and temperature within the outdoor heat exchanger 600 and the indoor heat exchanger 700. 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 four-way valve 400 can adjust the flow direction of the refrigerant to achieve switching between heating mode and cooling mode.

[0093] 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. Refrigerant is output from the compressor 300 and dissipates heat through the indoor heat exchanger 700 before entering the outdoor heat exchanger 600. After absorbing heat in the outdoor heat exchanger 600, the refrigerant circulates back to the compressor 300. By adjusting the opening of the throttle 500, the refrigerant pressure and temperature in the indoor and outdoor heat exchangers 700 and 600 can be adjusted to increase or decrease the heating effect.

[0094] If the indoor heat exchanger 700 is used as an evaporator, the outdoor heat exchanger 600 is used as a condenser. In this case, the air conditioner is in cooling mode. 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 throttle 500 and the indoor heat exchanger 700. 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 cooling effect.

[0095] Please refer to Figure 12 In some embodiments, an air inlet 101 is located at the top of the indoor unit 100. Airflow enters the indoor unit 100 through the top air inlet 101. An indoor temperature sensor is located at the air inlet 101. The indoor temperature detected by the indoor temperature sensor is also the return air temperature of the air conditioner.

[0096] In some embodiments, an outdoor fan is provided in the outdoor unit to blow air through the outdoor heat exchanger 500 to achieve heat exchange with the refrigerant. During the first stage, the first transition stage, the second stage, the second transition stage, and the third stage, the outdoor fan operates at an optimal speed calculated by the system.

[0097] 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.

[0098] Please refer to Figure 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 to make the indoor temperature reach a first preset temperature value; at the same time, the air guide plate is controlled to supply air downward; the air conditioning fan is controlled to operate at a first air conditioning speed; and the compressor 300 is controlled to operate at a first frequency;

[0099] The indoor temperature sensor detects the indoor temperature and compares it to a first preset temperature value. If the indoor temperature is lower than the first preset temperature value, the frequency increment is increased by the current operating frequency of the compressor 300. If the indoor temperature is higher than or equal to the first preset temperature value, the current operating state is maintained. This process is repeated at intervals of a first detection time.

[0100] After the first preset time, the first stage enters the first transition stage. In the first transition stage, the air-conditioning fan is controlled to operate at the second air-conditioning speed, and the compressor 300 is controlled to operate at the second frequency and maintain the first transition time before entering the second stage.

[0101] 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 conditioning fan is controlled to operate at a third air conditioning speed; and the compressor 300 is controlled to operate at a third frequency.

[0102] The control coil temperature sensor obtains the indoor coil temperature value and compares the indoor coil temperature value with a second preset temperature value. If the indoor coil temperature value is less than or equal to the second preset temperature value, the throttle opening is increased. If the indoor coil temperature value is greater than the second preset temperature value, the current return air dew point temperature difference is calculated. If the current return air dew point temperature difference is less than the preset return air dew point temperature difference, the throttle opening of the control coil 500 is reduced. 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 operating state is maintained. The above steps are repeated at intervals of the second detection time.

[0103] 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.

[0104] In the third stage, the indoor heat exchanger 700 is controlled to be used as a condenser, and the fresh air blower is turned on and the air conditioning blower is turned off;

[0105] The indoor coil temperature is detected by the coil temperature sensor and compared with a third preset temperature value. If the indoor coil temperature is lower than the third preset temperature value, the frequency increment is increased by the current operating frequency of the compressor 300. If the indoor coil temperature is greater than or equal to the third preset temperature value, the current operating state is maintained. This process is repeated at intervals of a third detection time.

[0106] After the third stage lasts for a third preset time, if the user does not turn off the formaldehyde removal mode, it will re-enter the first stage and cycle until the user exits the formaldehyde removal mode.

[0107] 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.

[0108] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An air conditioner, characterized in that: It includes: An indoor unit, wherein the indoor unit is provided with an air outlet and an air inlet for air conditioning; An air-conditioning fan, the air-conditioning fan being arranged in the indoor unit and being used for delivering air-conditioning air into the room through the air-conditioning outlet; An indoor heat exchanger is disposed in the indoor unit and performs heat exchange between the refrigerant flowing inside the indoor heat exchanger and the air to form a heating cycle or a cooling cycle, thereby increasing or decreasing the temperature of the conditioned air output to the room; An air guide plate is provided at the air outlet of the air conditioner, and the air guide plate is flipped to adjust the direction of the air conditioning air passing through the air outlet of the air conditioner; A fresh air fan is provided in the indoor unit and is used to deliver outdoor fresh air into the room and also to discharge formaldehyde to the outside; The controller is configured to: enter a first stage, control the indoor heat exchanger to function 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 blower is turned on at the same time.

2. The air conditioner according to claim 1, characterized in that The air conditioner further comprises: Outdoor unit; an outdoor heat exchanger, the outdoor heat exchanger being arranged 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 provided 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 indoor heat exchanger coil temperature.

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 the 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; in the first transition phase, reduce the frequency of the compressor and maintain it 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; in the second transition phase, reduce the frequency of the compressor and maintain it 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 temperature value of the indoor heat exchanger coil 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 during 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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