Air conditioning equipment and control method thereof

Abstract

The control method comprises the steps that after operation is started in a refrigeration mode, the current dew point temperature is determined, and the corresponding first target temperature when the rotating speed of an indoor fan is reduced to the lowest rotating speed is determined based on the current coil pipe temperature; if the first target temperature is smaller than or equal to the current dew point temperature, the rotating speed of the indoor fan is reduced till the coil pipe temperature is smaller than or equal to the current dew point temperature, device operation parameters of an outdoor unit do not need to be improved, energy consumption can be reduced, and it is guaranteed that the indoor refrigeration effect is stable and unchanged; and enough condensate water can be generated on the surfaces of the fins of the indoor heat exchanger to wash foreign matters, so that the aim of self-cleaning is fulfilled. If the first target temperature is larger than the current dew point temperature, the device operation parameters of the outdoor unit are increased to meet the conditions, then the first rotating speed is reduced to meet the condition that the coil pipe temperature is smaller than or equal to the current dew point temperature, enough condensate water can be generated on the fin surface of the indoor heat exchanger to wash foreign matter, and the self-cleaning purpose is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and particularly to an air conditioning device and a control method thereof. Background Art

[0002] When a conventional air conditioning device operates, the indoor fan in the indoor unit rotates, driving the air in the room to flow to the indoor heat exchanger to complete heat exchange, so as to achieve the effects of refrigeration and heating.

[0003] Currently, the heat exchanger generally adopts a finned tube heat exchanger, with copper tubes as the heat exchange tubes and fins installed outside the tubes, greatly increasing the heat exchange area on the air side and improving the heat exchange efficiency. However, as the air conditioning device is used, the surface of the heat exchange tubes in the indoor heat exchanger will remain dirt from the indoor air due to heat exchange, and long-term accumulation will produce odors or even mildew. In response to this problem, many indoor heat exchanger self-cleaning technologies have been developed in the air conditioning industry. The mainstream one is to stop the operation of the indoor fan during refrigeration, form frost on the fin surface, and then defrost to generate condensed water to clean the fin surface. However, this also has a greater impact on the refrigeration effect of the room. Summary of the Invention

[0004] The present application provides an air conditioning device and a control method thereof to solve the technical problem that when the air conditioning device enters the self-cleaning mode according to requirements to clean the heat exchange tubes, it has a greater impact on the refrigeration effect of the room.

[0005] Some embodiments provide an air conditioning device, including:

[0006] An outdoor unit, which is connected to the indoor unit through a refrigerant circuit. The outdoor unit is at least provided with a compressor, an outdoor heat exchanger, a throttling device and an outdoor fan. The indoor unit is at least provided with an indoor heat exchanger and an indoor fan. The refrigerant circuit allows the refrigerant to circulate successively through the compressor, the outdoor heat exchanger, the throttling device and the indoor heat exchanger;

[0007] An indoor sensor assembly, configured to detect indoor environmental data, where the indoor environmental data includes indoor temperature and indoor humidity;

[0008] A coil temperature sensor, configured to detect the coil temperature of the indoor heat exchanger;

[0009] A controller, communicatively connected to the indoor sensor assembly and the coil temperature sensor, at least controlling the operation of the indoor fan, the compressor, the throttling device and the outdoor fan, and configured to:

[0010] Receive and respond to a refrigeration start instruction, and control the air conditioning device to operate in a refrigeration mode until a target state is reached. The target state at least includes the indoor temperature reaching the target temperature corresponding to the refrigeration start instruction;

[0011] Determine the current dew point temperature according to the indoor temperature and the indoor humidity;

[0012] Based on the current coil temperature, determine the first target temperature corresponding to when the first speed of the indoor fan is reduced to the lowest first speed;

[0013] When the first target temperature is less than or equal to the current dew point temperature, reduce the first speed until the coil temperature is less than or equal to the current dew point temperature;

[0014] When the first target temperature is greater than the current dew point temperature, increase the device operation parameters of the outdoor unit until the coil temperature is less than or equal to the second target temperature, and then reduce the first speed until the coil temperature is less than or equal to the current dew point temperature; wherein, the first target temperature determined based on the second target temperature is less than or equal to the current dew point temperature, and the device operation parameters include at least one of the second speed of the outdoor fan, the opening degree of the throttling device, and the compressor frequency.

[0015] The above air conditioning equipment can receive and respond to a refrigeration start instruction, control the air conditioning equipment to operate in a refrigeration mode until the indoor temperature reaches the target temperature corresponding to the refrigeration start instruction; determine the current dew point temperature according to the indoor temperature and the indoor humidity, and determine the first target temperature corresponding to when the first speed of the indoor fan is reduced to the lowest first speed based on the current coil temperature; when the first target temperature is less than or equal to the current dew point temperature, reduce the first speed until the coil temperature is less than or equal to the current dew point temperature; when the first target temperature is greater than the current dew point temperature, increase the device operation parameters of the outdoor unit until the coil temperature is less than or equal to the second target temperature, and then reduce the first speed until the coil temperature is less than or equal to the current dew point temperature; wherein, the first target temperature determined based on the second target temperature is less than or equal to the current dew point temperature, and the device operation parameters include at least one of the second speed of the outdoor fan, the opening degree of the throttling device, and the compressor frequency.

[0016] It can be understood that after the air conditioning equipment is started and running, it first operates in the cooling mode until the indoor temperature reaches the target temperature corresponding to the cooling start instruction, giving priority to the comfort of the indoor environment. Then, based on the first speed of the current indoor fan and the current coil temperature, it is estimated whether the coil temperature can be reduced below the current dew point temperature after the first speed is reduced to the lowest first speed. If the condition is met, the first speed is directly reduced to make the coil temperature drop below the current dew point temperature without increasing the operating parameters of the outdoor unit components, which can save energy consumption, does not affect the refrigerant circulation volume in the refrigerant circuit, and can also ensure the stability of the cooling effect of the indoor environment. At the same time, after the coil temperature drops below the current dew point temperature, it can also generate enough condensed water on the fin surface of the indoor heat exchanger to wash away foreign objects, achieving the purpose of self-cleaning. If the condition is not met, at least one of the second speed of the outdoor fan, the opening of the throttling device, and the compressor frequency can be increased to meet the above conditions, and then the first speed is reduced to make the coil temperature drop below the current dew point temperature, which can also generate enough condensed water on the fin surface of the indoor heat exchanger to wash away foreign objects, achieving the purpose of self-cleaning. Moreover, the self-cleaning of the indoor heat exchanger in this application is carried out during normal cooling operation, and it will not cause the user to feel a large change in indoor temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for the description of the embodiments of the present application or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic diagram of the system block diagram of the air conditioning equipment in one embodiment;

[0019] Figure 2 It is a schematic diagram of the internal structure of the air conditioning equipment in one embodiment;

[0020] Figure 3 It is a schematic cross-sectional view of the indoor unit in one embodiment;

[0021] Figure 4 It is a schematic diagram of the system block diagram of the air conditioning equipment in another embodiment;

[0022] Figure 5 It is a schematic flowchart of the control method of the air conditioning equipment in one embodiment;

[0023] Figure 6 It is a schematic flowchart of the control method of the air conditioning equipment in another embodiment;

[0024] Figure 7 Schematic flowchart of the control method for an air conditioning device in another embodiment;

[0025] Figure 8 Schematic flowchart of the control method for an air conditioning device in another embodiment;

[0026] Figure 9 Schematic flowchart of the control method for an air conditioning device in another embodiment;

[0027] Figure 10 Schematic flowchart of the control method for an air conditioning device in another embodiment;

[0028] Figure 11 Schematic flowchart of the control method for an air conditioning device in another embodiment. Detailed implementation manners

[0029] The embodiments will be described in detail below, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following embodiments do not represent all implementation manners consistent with the present application. They are merely examples of systems and methods consistent with some aspects of the present application detailed in the claims.

[0030] It should be noted that the brief description of the terms in the present application is only for the convenience of understanding the implementation manners described next, rather than intending to limit the implementation manners of the present application. Unless otherwise specified, these terms should be understood in their ordinary and common meanings.

[0031] The terms "first", "second", "third", etc. in the specification, claims and the above-mentioned drawings of the present application are used to distinguish similar or like objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that such terms can be interchanged under appropriate circumstances.

[0032] The terms "comprising" and "having" and any variations thereof are intended to cover but not exclude inclusion. For example, a product or device comprising a series of components does not necessarily have to be limited to all the components clearly listed, but may include other components not clearly listed or inherent to these products or devices.

[0033] The term "module" refers to any known or later-developed hardware, software, firmware, artificial intelligence, fuzzy logic or a combination of hardware or / and software code that can perform functions related to that element.

[0034] See Figure 1, which is a schematic system diagram of an air conditioning device provided in an embodiment of the present application. Specifically, it includes an outdoor unit 1 and an indoor unit 2, which are connected through a refrigerant circuit and cooperate with each other to achieve the cooling or heating function of the indoor environment. Among them, the outdoor unit 1 is installed outdoors and is used for heat exchange with outdoor air to complete the compression and condensation of the refrigerant. The indoor unit 2 is installed in the indoor environment and can be in the form of an indoor wall-mounted unit, an indoor cabinet unit, etc., and is used to complete the cooling or heating of indoor air, as well as the circulation and filtration of air. The refrigerant circuit circulates refrigerant, which can perform a vapor compression refrigeration cycle, and is connected to the outdoor unit 1 and the indoor unit 2 using connecting pipes to form a refrigerant circulation pipeline for the refrigerant to circulate.

[0035] See Figure 2 , which is a schematic internal structure diagram of an air conditioning device provided in an embodiment of the present application. Its internal components at least include: a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, a throttling device 14, an indoor heat exchanger 15, an indoor fan 16, and an outdoor fan 17. Among them, at least a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, a throttling device 14, and an outdoor fan 17 are provided in the outdoor unit 1, and at least an indoor heat exchanger 15 and an indoor fan 16 are provided in the indoor unit 2. The refrigerant circuit allows the refrigerant to circulate in sequence through the compressor 11, the outdoor heat exchanger 13, the throttling device 14, and the indoor heat exchanger 15. During the operation of the air conditioning device, both the outdoor heat exchanger 13 and the indoor heat exchanger 15 can be used as condensers or evaporators. When the indoor heat exchanger 15 is used as a condenser, the air conditioning device operates in the heating mode, and when the indoor heat exchanger 15 is used as an evaporator, the air conditioning device operates in the cooling mode. In addition, the indoor fan 16 is configured to drive indoor air to flow to the indoor heat exchanger 15 for heat exchange; the outdoor fan 17 is configured to drive outdoor air to flow to the outdoor heat exchanger 13 for heat exchange.

[0036] It can be understood that when the air conditioning equipment operates in the cooling mode, the refrigerant is compressed in the compressor 11, dissipates heat through the outdoor heat exchanger 13 (which acts as a condenser at this time) and is cooled into a liquid state. The liquid refrigerant will flow back to the indoor unit 2 through the refrigerant circuit, absorbs heat when evaporating in the indoor heat exchanger 15 (which acts as an evaporator at this time), thereby reducing the indoor environmental temperature. The indoor fan 16 assists in evenly distributing the cooled air to the indoor environment. The refrigerant that has evaporated again and absorbed heat circulates back to the outdoor unit 1 through the refrigerant circuit, continuously circulating to achieve the cooling effect. The outdoor fan 17 can help the outdoor unit 1 dissipate heat, ensuring that the outdoor heat exchanger 13 can work efficiently. When the air conditioning equipment operates in the heating mode, the refrigerant is compressed in the compressor 11, enters the indoor heat exchanger 15 (which acts as a condenser at this time) through the four-way valve 12, releases heat through the condensation and liquefaction process, and these heats are transferred to the indoor air and are blown into the indoor environment by the assistance of the indoor fan 16, thereby increasing the temperature of the indoor air. The liquid refrigerant after condensation and liquefaction enters the outdoor heat exchanger 13 (which acts as an evaporator at this time) through the refrigerant circuit, absorbs the heat of the outdoor air through the evaporation and gasification process to become a low-temperature and low-pressure gaseous refrigerant, and is inhaled by the compressor 11 again, continuously circulating to achieve the heating effect.

[0037] In an exemplary embodiment, please continue to refer to Figure 2 , the air conditioning equipment provided by the embodiment of the present application further includes an indoor sensor assembly 18, which is configured to detect indoor environmental data, and the indoor environmental data includes indoor temperature and indoor humidity.

[0038] Specifically, the indoor sensor assembly 18 can be set on the indoor unit 2 or at any position in the indoor environment where the indoor unit 2 is located, as long as it can detect the indoor environmental data. The indoor sensor assembly 18 can include a sensor device for obtaining the indoor temperature and a sensor device for obtaining the indoor humidity, or can directly adopt an integrated temperature and humidity sensor device. Exemplarily, the indoor sensor assembly 18 can include an indoor temperature sensor and an indoor humidity sensor. The indoor temperature sensor is configured to detect the indoor temperature, and the indoor humidity sensor is configured to detect the indoor humidity.

[0039] In an exemplary embodiment, please continue to refer to Figure 2 , the air conditioning equipment provided by the embodiment of the present application further includes a coil temperature sensor 19, which is configured to detect the coil temperature of the indoor heat exchanger 15.

[0040] Specifically, the indoor heat exchanger 15 can be a finned-tube heat exchanger, with copper (aluminum) tubes as the heat exchange tubes, and fins are installed outside the tubes, greatly increasing the heat exchange area on the air side and improving the heat exchange efficiency. The coil temperature sensor 19 can be set at any position on the outer wall of the above heat exchange tubes to detect the surface temperature of the heat exchange tubes, that is, the coil temperature.

[0041] It can be understood. Please refer to Figure 3 , which is a cross-sectional schematic view of the indoor unit of the air conditioning equipment provided by the embodiment of the present application. When the indoor unit operates, mainly driven by the indoor fan 16, the indoor air is circulated to the indoor heat exchanger 15 for heat exchange to achieve the effects of cooling and heating. As Figure 3 shown, after the indoor fan 16 starts to operate, the indoor air is introduced from the air inlet A of the indoor unit, circulated to the indoor heat exchanger 15 for heat exchange, and then blown out from the air outlet B of the indoor unit. Since the composition of indoor air is very complex, dirt will remain on the surface of the heat exchange tubes of the indoor heat exchanger 15 due to heat exchange, and peculiar smell or even mildew will be generated after long-term accumulation.

[0042] Correspondingly, generally in the heating mode, the coil temperature of the indoor heat exchanger is relatively high, and the air conditioning equipment can also control the operating parameters of each device to dry the surface of the indoor heat exchanger to prevent moisture and mildew, and perform disinfection by high-temperature steam to achieve self-cleaning of the indoor heat exchanger in the heating mode. For the case of refrigeration required, the mainstream is to enter the self-cleaning mode, stop the operation of the indoor fan, and continue to refrigerate to freeze the condensed water on the surface of the fins of the indoor heat exchanger into frost, which wraps the dust and dirt on the surface, and then switch to the heating mode to defrost and generate condensed water to clean the surface of the fins. Due to the above self-cleaning process of the indoor heat exchanger, it is necessary to stop the operation of the indoor fan and the compressor to achieve defrosting, and thus the actual normal refrigeration process cannot be carried out simultaneously with the self-cleaning process, which will cause a greater impact on the refrigeration effect of the room. At the same time, generally, the self-cleaning process is entered according to a fixed cycle or the user's active setting, so the accumulation of foreign objects that are not cleaned in time will also result in a poor cleaning effect on the indoor heat exchanger.

[0043] Based on this, in an exemplary embodiment, please refer to Figure 4 , the air conditioning equipment further includes a controller 3, and the controller 3 is communicatively connected to the indoor sensor assembly 18 and the coil temperature sensor 19, and at least controls the operation of the indoor fan 16, the compressor 11, the throttling device 14, and the outdoor fan 17. It can be understood that the controller 3 obtains detection data such as indoor temperature, indoor humidity, and coil temperature, and is used to control the operating parameters of devices such as the indoor fan 16, the compressor 11, the throttling device 14, and the outdoor fan 17, so as to achieve self-cleaning of the indoor heat exchanger 15 on the basis of maintaining the normal operation of the air conditioning equipment for refrigeration.

[0044] In addition, the controller 3 is also the main control center of the air conditioning device, and can also be communicatively connected to other controllable components in the outdoor unit 1 and the indoor unit 2, and can send / receive signals to each other, so as to realize operations such as obtaining information of each component of the air conditioning device and issuing control instructions. For example, the controller 3 can be used to connect various sensing elements provided in the air conditioning device, obtain the detected sensing data, and control the operating parameters of core devices such as the compressor 11, the four-way valve 12, the outdoor heat exchanger 13, the throttling device 14, the indoor heat exchanger 15, the indoor fan 16 and the outdoor fan 17 during the refrigeration and heating operation processes. At the same time, the controller can also be used to control the opening and closing states of various pumps and valve elements provided on the refrigerant circuit to ensure more efficient circulation of the refrigerant.

[0045] In an exemplary embodiment, the controller 3 is configured to:

[0046] Receive and respond to a refrigeration start instruction, and control the air conditioning device to operate in a refrigeration mode until a target state is reached, where the target state at least includes that the indoor temperature reaches the target temperature corresponding to the refrigeration start instruction;

[0047] Determine the current dew point temperature according to the indoor temperature and the indoor humidity;

[0048] Based on the current coil temperature, determine the first target temperature corresponding to when the first rotation speed of the indoor fan is reduced to the lowest first rotation speed;

[0049] When the first target temperature is less than or equal to the current dew point temperature, reduce the first rotation speed until the coil temperature is less than or equal to the current dew point temperature;

[0050] When the first target temperature is greater than the current dew point temperature, increase the operating parameters of the devices of the outdoor unit until the coil temperature is less than or equal to the second target temperature, and reduce the first rotation speed until the coil temperature is less than or equal to the current dew point temperature; wherein, the first target temperature determined based on the second target temperature is less than or equal to the current dew point temperature, and the device operating parameters include at least one of the second rotation speed of the outdoor fan, the opening degree of the throttling device and the compressor frequency.

[0051] Wherein, the refrigeration start instruction is a command instructing the air conditioning device to start operating in a refrigeration mode, which can be sent by the user through a remote control device or a terminal control device, or can be automatically sent by other timing devices after reaching the timing start time, or can also be output by the controller itself after judging that the air conditioning device start condition is met according to the indoor environment data. After receiving the refrigeration start instruction, the controller responds to the refrigeration start instruction to control the start operation of the core devices of the indoor unit and the outdoor unit, so that the refrigerant efficiently circulates in the refrigerant circuit, and realizes the cooling of the indoor air.

[0052] Specifically, the air conditioner operates in the cooling mode until it reaches the target state, indicating that the indoor environment has met the comfort requirements for cooling. Among them, the cooling start instruction may include a corresponding target temperature, which is used to indicate what comfort requirements the indoor environment needs to meet. Correspondingly, the target state may include that the indoor temperature reaches the target temperature corresponding to the cooling start instruction, may also include that the indoor humidity reaches the preset target humidity, may also include that other indoor environment data reach the corresponding target values, and may also include meeting the above multiple conditional requirements.

[0053] Exemplarily, determining whether the target state is reached includes: when the air conditioner operates in the cooling mode, if the indoor temperature reaches the target temperature corresponding to the cooling start instruction, it is determined that the target state is reached. Among them, the indoor temperature reaching the target temperature corresponding to the cooling start instruction can be that the indoor temperature reaches a temperature value within the allowable error range from the target temperature. For example, if the target temperature is set to T0 and the indoor temperature reaches (T0 + 1°C), it can be determined that the indoor temperature reaches the target temperature corresponding to the cooling start instruction.

[0054] It can be understood that after the air conditioner starts and operates in the cooling mode, it can be preferentially controlled to operate until it reaches the target state to quickly meet the user's cooling demand for the indoor environment. Then, based on the indoor environment that has met the comfort requirements for cooling, the subsequent self-cleaning process of the indoor heat exchanger is carried out to achieve the purpose of saving energy consumption.

[0055] Based on the self-cleaning technology of the indoor heat exchanger in the cooling mode, it is known that the dust and dirt on the surface can be covered and wrapped by generating condensate on the fin surface of the indoor heat exchanger. Then, when condensate continues to be generated, the foreign objects on the fin surface are washed away to achieve the purpose of self-cleaning. Among them, the dew point temperature is the temperature limit at which water vapor can condense into liquid water, that is, when the coil temperature drops below the dew point temperature, condensate will be generated on the fin surface.

[0056] Furthermore, the embodiment of the present application can determine the current dew point temperature according to the indoor temperature and indoor humidity detected when the target state is reached. Then, the coil temperature is controlled to drop below the current dew point temperature, so that water vapor continuously condenses into liquid water on the fin surface of the indoor heat exchanger, and the foreign objects on the fin surface are washed away to achieve the purpose of cleaning the foreign objects on the surface of the indoor heat exchanger.

[0057] Exemplarily, the current dew point temperature is determined according to the indoor temperature and indoor humidity. Specifically, it can be calculated based on the corresponding relationship between the preset temperature, humidity, and dew point temperature. The corresponding relationship between the preset temperature, humidity, and dew point temperature includes a preset formula, a preset curve graph, and a preset data table. A number of sets of data between the temperature, humidity, and dew point temperature can be obtained through pre-experiments, and then the corresponding relationship among the three can be analyzed based on the number of sets of data and stored in the controller in advance. For example, in this embodiment, the corresponding relationship between the preset temperature data, humidity data, and dew point temperature is expressed by the following formula:

[0058]

[0059] Where T is the outdoor temperature, RH is the outdoor humidity, and a and b are constants. For example, for water, a can be set to 17.625 and b can be set to 243.04.

[0060] According to the operating rules of the air conditioning equipment, changes in factors such as the first speed of the indoor fan, the second speed of the outdoor fan, and the refrigerant circulation volume in the refrigerant circuit will all affect the coil temperature of the indoor heat exchanger. Among them, the refrigerant circulation volume in the refrigerant circuit can also change with the operating parameters of devices such as the opening degree of the throttling device and the compressor frequency. For example, as the first speed of the indoor fan decreases, the air flow rate on the surface of the indoor heat exchanger decreases, the heat exchange efficiency increases, and the coil temperature will gradually decrease. As the second speed of the outdoor fan increases, the air flow rate on the surface of the outdoor heat exchanger increases, the heat exchange efficiency decreases, and the coil temperature gradually decreases. As the operating parameters of devices such as the opening degree of the throttling device and the compressor frequency increase, the refrigerant circulation volume in the refrigerant circuit increases, the refrigeration efficiency increases, and the coil temperature gradually decreases.

[0061] Furthermore, the method of controlling the coil temperature to decrease is not unique. It can be achieved by controlling the first speed of the indoor fan, or by controlling the second speed of the outdoor fan, or by controlling the change in the refrigerant circulation volume in the refrigerant circuit, or by jointly controlling the changes in the above multiple operating parameters.

[0062] In some embodiments, after the air conditioning equipment operates in the cooling mode until it reaches the target state, according to the above change rules, based on the current state of the first speed of the indoor fan and the coil temperature, it is determined whether directly reducing the first speed can cause the coil temperature to drop below the current dew point temperature. If it can, the first speed is directly reduced until the coil temperature is less than or equal to the current dew point temperature; if not, the operating parameters of the outdoor unit can be first increased until it is satisfied that directly reducing the first speed can cause the coil temperature to drop below the current dew point temperature.

[0063] The method for determining whether directly reducing the first rotation speed can cause the coil temperature to drop below the current dew point temperature is not limited. It can be to first determine the first target temperature corresponding to the lowest first rotation speed when the first rotation speed of the indoor fan is reduced based on the current coil temperature, and then judge whether directly reducing the first rotation speed can cause the coil temperature to drop below the current dew point temperature according to the comparison between the first target temperature and the current dew point temperature.

[0064] Among them, the first target temperature is the temperature value to which the coil temperature will drop after only reducing the first rotation speed to the lowest first rotation speed while keeping the operating parameters of other devices unchanged. It can be obtained based on the current coil temperature and the temperature drop value of the coil temperature corresponding to the reduction from the current first rotation speed to the lowest first rotation speed. Exemplarily, the above-mentioned coil temperature drop value can be determined according to the first rotation speed difference between the first rotation speed and the lowest first rotation speed. For an air conditioner with multiple fan speeds for the indoor fan, the coil temperature drop value can also be obtained by converting the first rotation speed into a fan speed value and then determining it according to the number of fan speed steps different from the lowest fan speed.

[0065] Specifically, when the first target temperature is less than or equal to the current dew point temperature, it indicates that in the current state, directly reducing the first rotation speed can cause the coil temperature to drop below the current dew point temperature. Then the controller can directly control the reduction of the first rotation speed until the coil temperature detected by the coil temperature sensor is lower than the current dew point temperature. It can be understood that in this embodiment, only reducing the first rotation speed of the indoor fan to cause the coil temperature to drop accordingly does not require increasing the operating parameters of the outdoor unit devices, which can save energy consumption, does not affect the refrigerant circulation amount in the refrigerant circuit, and can also ensure the stable cooling effect of the indoor environment. At the same time, after the coil temperature drops below the current dew point temperature, it can also achieve the purpose of generating enough condensed water on the fin surface of the indoor heat exchanger to wash foreign matters and realize self-cleaning.

[0066] Exemplarily, the method for controlling the reduction of the first rotation speed is not limited. It can be to directly control the reduction of the first rotation speed to the lowest first rotation speed, or to gradually reduce the first rotation speed in a preset rotation speed step until the detected coil temperature is lower than the current dew point temperature.

[0067] Furthermore, when the first target temperature is greater than the current dew point temperature, it indicates that in the current state, directly reducing the first rotation speed cannot cause the coil temperature to drop below the current dew point temperature. Then it is necessary to first increase the operating parameters of the outdoor unit devices to reduce the coil temperature until it meets the condition that directly reducing the first rotation speed can cause the coil temperature to drop below the current dew point temperature. It can be understood that meeting the condition that directly reducing the first rotation speed can cause the coil temperature to drop below the current dew point temperature means meeting the requirement of determining the first target temperature based on the real-time detected coil temperature and the first target temperature being less than or equal to the current dew point temperature.

[0068] In some embodiments, when the first target temperature is greater than the current dew point temperature, the temperature difference between the first target temperature and the current dew point temperature may be determined first, and then the second target temperature may be obtained based on the temperature difference and the current coil temperature. It can be understood that the second target temperature is the temperature value that satisfies the condition that the first target temperature determined according to this temperature value is lower than the current dew point temperature, indicating that after the detected coil temperature is less than or equal to the second target temperature, the first rotation speed can be directly reduced to make the coil temperature drop below the current dew point temperature accordingly.

[0069] The device operation parameters of the outdoor unit that can be increased are not unique and may include at least one of the second rotation speed of the outdoor fan, the opening degree of the throttling device, and the compressor frequency. For example, one or more of the above device operation parameters can be increased, or they can be increased sequentially according to a preset adjustment sequence to make the coil temperature drop below the second target temperature.

[0070] In some embodiments, before the adjustment, it may also be determined first whether the above device operation parameters are adjustable. For example, if the outdoor fan is a single-speed fan, its rotation speed cannot be adjusted. If the throttling device is a capillary tube with a fixed aperture, its opening degree cannot be adjusted. Therefore, when the above device operation parameters are increased sequentially according to a preset adjustment sequence, for example, when adjusting in the order of the second rotation speed of the outdoor fan, the opening degree of the throttling device, and the compressor frequency, it can be determined first whether the device operation parameters are adjustable in turn, and then, if they are adjustable, their parameter values can be increased to make the coil temperature drop below the second target temperature. In this embodiment, by first determining whether the device operation parameters are adjustable, the applicable range of the self-cleaning of the indoor heat exchanger in air-conditioning equipment can be effectively increased.

[0071] The above air-conditioning equipment, after starting and running, first operates in the cooling mode until the indoor temperature reaches the target temperature corresponding to the cooling start instruction, giving priority to the indoor environmental comfort. Then, according to the first speed of the current indoor fan and the current coil temperature, it is deduced whether the coil temperature can be reduced below the current dew point temperature after the first speed is reduced to the lowest first speed. If the condition can be met, the first speed is directly reduced to make the coil temperature drop below the current dew point temperature without increasing the operating parameters of the outdoor unit components, which can save energy consumption, does not affect the refrigerant circulation amount in the refrigerant circuit, and can also ensure the stable cooling effect of the indoor environment. At the same time, after the coil temperature drops below the current dew point temperature, it can also generate enough condensed water on the fin surface of the indoor heat exchanger to wash foreign matters, achieving the purpose of self-cleaning. If the condition cannot be met, at least one of the second speed of the outdoor fan, the opening degree of the throttling device, and the compressor frequency can be increased to meet the above conditions, and then the first speed is reduced to make the coil temperature drop below the current dew point temperature, which can also generate enough condensed water on the fin surface of the indoor heat exchanger to wash foreign matters, achieving the purpose of self-cleaning. Moreover, the self-cleaning of the indoor heat exchanger in this application is carried out during the normal cooling operation, and it will not cause the user to feel a large change in the indoor temperature.

[0072] In an exemplary embodiment, the controller is further configured to:

[0073] Determine the temperature drop value of the coil temperature corresponding to the first speed being reduced from the current first speed to the lowest first speed;

[0074] Based on the current coil temperature, after reducing the temperature drop value of the coil temperature, obtain the first target temperature.

[0075] Wherein, the lowest first speed is the lower limit speed value corresponding to the adjustable range of the first speed of the indoor fan. It can be understood that after the first speed of the indoor fan is reduced from the current first speed to the lowest first speed, the coil temperature will decrease accordingly, and the temperature drop value of the coil temperature is the reduction amplitude of the coil temperature during this process. After obtaining the temperature drop value of the coil temperature, subtract the temperature drop value of the coil temperature from the current coil temperature to obtain the first target temperature, that is, the temperature value to which the coil temperature will drop after only reducing the first speed to the lowest first speed while keeping the operating parameters of other components unchanged.

[0076] Specifically, the method for determining the temperature drop value of the coil temperature is not limited. It can be determined according to the first speed difference between the first speed and the lowest first speed. For example, pre-tests can be carried out first to obtain the corresponding relationship between the coil temperature and the change of the first speed, and then calculate the temperature drop value of the coil temperature corresponding to the first speed difference according to this corresponding relationship.

[0077] For an air conditioning device with an indoor fan having multiple wind speeds, the temperature drop value of the coil can also be determined by converting the first rotational speed into a wind speed value and then based on the number of wind speed levels between the current wind speed level and the lowest wind speed level. In an exemplary embodiment, the controller is further configured to:

[0078] Obtain the indoor fan wind speed level to which the current first rotational speed belongs;

[0079] Determine the temperature drop value of the coil according to the indoor fan wind speed level and the preset corresponding relationship between the indoor fan wind speed level and the temperature drop value of the coil.

[0080] Specifically, the controller can preset the wind speed levels of the indoor fan, such as the number of wind speed levels and the range of the first rotational speed corresponding to each wind speed level. According to the range of the first rotational speed where the current first rotational speed is located, obtain the indoor fan wind speed level to which the current first rotational speed belongs.

[0081] Taking the wind speed levels of the indoor fan including four levels: ultra-high wind, high wind, medium wind, and low wind as an example, the range of the first rotational speed corresponding to the ultra-high wind speed level can be [a, b], the range of the first rotational speed corresponding to the high wind speed level can be [c, d], the range of the first rotational speed corresponding to the medium wind speed level can be [e, f], and the range of the first rotational speed corresponding to the low wind speed level can be [g, h]. If the range of the current first rotational speed is [a, b], then the indoor fan wind speed level to which the current first rotational speed belongs is the ultra-high wind speed level. If the range of the current first rotational speed is [e, f], then the indoor fan wind speed level to which the current first rotational speed belongs is the medium wind speed level.

[0082] Further, the controller can also preset the corresponding relationship between the indoor fan wind speed level and the temperature drop value of the coil, which is used to obtain the temperature drop value of the coil when the first rotational speed of the indoor fan is reduced from the first rotational speed corresponding to this indoor fan wind speed level to the lowest first rotational speed.

[0083] Exemplarily, the preset corresponding relationship between the indoor fan wind speed level and the temperature drop value of the coil can be represented by a preset formula or a preset relationship table.

[0084] Taking the representation of the preset relationship table as an example, after obtaining the indoor fan speed range to which the current first speed belongs, the temperature drop value TX of the coil temperature can be determined by looking up the table in the first preset relationship table. Among them, several groups of temperature drop values TX of the coil temperature corresponding to different indoor fan speed ranges are recorded in the first preset relationship table. Specifically, before the air conditioner equipment leaves the factory, the air conditioner equipment can be pre-simulated to operate at different speed ranges, and the first speed is reduced to the lowest first speed, and the temperature drop value TX of the coil temperature corresponding to different speed reduction processes can be obtained. For example, as shown in Table 1, when the indoor fan speed range to which the current first speed belongs is the ultra-high speed range, the temperature drop value TX of the coil temperature corresponding to the reduction to the lowest first speed can be obtained by looking up the table as x℃.

[0085] Table 1 Relationship table of temperature drop values of coil temperature corresponding to different indoor fan speed ranges

[0086]

[0087] In an exemplary embodiment, the controller is further configured to:

[0088] When the first target temperature is greater than the current dew point temperature, obtain the temperature difference between the first target temperature and the current dew point temperature;

[0089] Based on the temperature difference, determine the adjustable range corresponding to the operating parameters of each device;

[0090] Increase the operating parameters of each device by the corresponding adjustable range until the first target temperature determined according to the coil temperature is less than or equal to the current dew point temperature.

[0091] Specifically, when the first target temperature is greater than the current dew point temperature, it means that in the current state, directly reducing the first speed cannot cause the coil temperature to drop below the current dew point temperature. Then, the temperature difference between the first target temperature and the current dew point temperature can be obtained first, and it can be determined how much the coil temperature needs to be reduced by adjusting the operating parameters of the outdoor unit so that directly reducing the first speed can cause the coil temperature to drop below the current dew point temperature. It can be understood that by taking the difference between the first target temperature and the current dew point temperature, the temperature difference between the two can be obtained.

[0092] Further, based on the temperature difference, that is, the target amplitude by which the coil temperature needs to be reduced, the adjustable range of the operating parameters of each device can be correspondingly determined. In an exemplary embodiment, the controller is further configured to:

[0093] According to the target temperature difference range to which the temperature difference belongs and the corresponding relationship between the temperature difference range and the adjustment range preset, determine the target adjustment range;

[0094] If the parameter value of the adjusted target amplitude exceeds the upper limit value of the device operating parameters, the difference between the upper limit value and the current parameter value is used as the adjustable amplitude; otherwise, the target adjustment amplitude is used as the adjustable amplitude.

[0095] Specifically, the controller can preset the temperature difference range between the first target temperature and the dew point temperature in advance, such as the number of temperature difference ranges, and the temperature difference range corresponding to each temperature difference range. Then, according to the temperature difference (ΔT) between the actual first target temperature and the current dew point temperature, the target temperature difference range to which the temperature difference belongs is obtained.

[0096] Taking the temperature difference range including four temperature difference ranges as an example, the temperature difference range corresponding to the first temperature difference range can be ΔT > 5°C, the temperature difference range corresponding to the second temperature difference range can be 5°C ≥ ΔT > 3°C, the temperature difference range corresponding to the third temperature difference range can be 3°C ≥ ΔT > 1°C, and the temperature difference range corresponding to the fourth temperature difference range can be 1°C ≥ ΔT. If the temperature difference ΔT is 2°C, it should belong to the temperature difference range of 3°C ≥ ΔT > 1°C, and the obtained target temperature difference range is the third temperature difference range.

[0097] Furthermore, the controller can also preset the corresponding relationship between the temperature difference range and the adjustment amplitude of each device operating parameter in advance, which is used to obtain the target adjustment amplitude of the corresponding device operating parameter. The amplitude of the device operating parameter needs to correspond to the amplitude increased from the current parameter value.

[0098] Exemplarily, the preset corresponding relationship between the temperature difference range and the adjustment amplitude of each device operating parameter can be represented by a preset formula or a preset relationship table.

[0099] Taking the second speed of the outdoor fan as the device operating parameter and the corresponding relationship being represented by a preset relationship table as an example, after obtaining the target temperature difference range to which the temperature difference belongs, the target adjustment amplitude can be determined by looking up the table in the second preset relationship table. Among them, the second preset relationship table records several groups of adjustment amplitudes of the second speed corresponding to different temperature difference ranges. Specifically, before the air conditioner equipment leaves the factory, it can be pre-simulated how much the second speed needs to be adjusted to meet the temperature difference ΔT under different temperature differences ΔT. For example, as shown in Table 2, when the target temperature difference range to which the temperature difference belongs is the third temperature difference range (3°C ≥ ΔT > 1°C), the target adjustment amplitude of the second speed that needs to be correspondingly increased can be obtained by looking up the table as k%.

[0100] Table 2 Relationship table of the adjustment amplitude of the second speed corresponding to different temperature difference ranges

[0101]

[0102] After obtaining the target adjustment range, it is also necessary to determine whether the device operating parameters allow adjustment at the target adjustment range. Correspondingly, the parameter value after increasing the device operating parameters by the target adjustment range can be obtained first. If the parameter value after increasing the target adjustment range exceeds the upper limit value of the device operating parameters, it indicates that adjusting at the target adjustment range has exceeded the adjustable range of the device operating parameters, and then the difference between the upper limit value of the adjustable range of the device operating parameters and the current parameter value can be directly used as the adjustable range. If the parameter value after increasing the target adjustment range does not exceed the upper limit value of the device operating parameters, it indicates that adjusting at the target adjustment range will not exceed the adjustable range of the device operating parameters, and then the target adjustment range can be used as the adjustable range.

[0103] Correspondingly, after obtaining the adjustable range corresponding to each device operating parameter, the device operating parameters can be increased by the corresponding adjustable range until the detected coil temperature is less than or equal to the second target temperature, and the first target temperature determined based on the second target temperature is less than or equal to the current dew point temperature. Among them, one or more of the device operating parameters can be increased, or they can be increased sequentially according to a preset adjustment order to reduce the coil temperature below the second target temperature.

[0104] In an exemplary embodiment, the controller is further configured to:

[0105] Increase the second speed by the adjustable range corresponding to the second speed;

[0106] If the coil temperature is greater than the second target temperature after the first preset duration, open the throttle device by the adjustable range corresponding to the throttle device opening;

[0107] If the coil temperature is greater than the second target temperature after the first preset duration, increase the compressor frequency by the adjustable range corresponding to the compressor frequency.

[0108] It can be understood that in the embodiment of the present application, first, the second speed is increased by the adjustable range corresponding to the second speed to reduce the coil temperature below the second target temperature. At this time, the refrigerant circulation amount in the refrigerant circuit will not change, which can save energy consumption and ensure the relatively stable refrigeration effect of the indoor environment.

[0109] After the first preset duration, when the coil temperature is still greater than the second target temperature, it indicates that the refrigerant circulation amount in the refrigerant circuit must be adjusted to reduce the coil temperature below the second target temperature. In this case, the embodiment of the present application also preferentially considers opening the throttle device by the adjustable range corresponding to the throttle device opening. At this time, the core operating parameter of the compressor frequency is not changed, and the influence on the refrigeration effect of the indoor environment can also be reduced to a certain extent.

[0110] Finally, if after the first preset duration, the coil temperature is still greater than the second target temperature, indicating that adjusting the operating parameters of the components of other outdoor units cannot meet the conditions and the coil temperature cannot be reduced below the second target temperature, the compressor frequency is increased by an adjustable amplitude corresponding to the compressor frequency to meet the requirement of reducing the coil temperature below the second target temperature.

[0111] In an exemplary embodiment, the controller is further configured to:

[0112] Gradually reduce the first speed of the indoor fan in preset speed steps until the coil temperature is less than or equal to the current dew point temperature.

[0113] Specifically, the value of the preset speed step is not limited and can be determined according to actual technical requirements and temperature change conditions. The controller can, based on the current first speed, reduce the first speed by the preset speed step, wait for the second preset duration, then detect the coil temperature again through the coil temperature sensor to determine whether it is less than or equal to the current dew point temperature. If not satisfied, continue to reduce the first speed by the preset speed step and wait for the second preset duration, then detect the coil temperature again and determine whether it is less than or equal to the current dew point temperature, and so on in a loop; if satisfied, stop adjusting the first speed and keep the operating parameters of the components unchanged and continue to operate.

[0114] In an exemplary embodiment, please refer to Figure 3 , a wind deflector 20 is provided at the air outlet B of the indoor unit 2. Among them, the wind deflector 20 is mainly used to change the air outlet direction of the air outlet B. By adjusting the air outlet direction, cold air or hot air can be more evenly distributed in the indoor environment, improving the use effect of the air conditioning equipment.

[0115] In an exemplary embodiment, the controller is further configured to:

[0116] When the first target temperature is less than or equal to the current dew point temperature, adjust the angle of the wind deflector to the minimum angle.

[0117] Among them, the minimum angle of the wind deflector can be an angle close to the closed state of the wind deflector.

[0118] Specifically, when the first target temperature is less than or equal to the current dew point temperature, while directly reducing the first speed of the indoor fan to reduce the coil temperature below the current dew point temperature, the angle of the wind deflector can also be adjusted to the minimum angle. It can be understood that after adjusting the angle of the wind deflector to the minimum angle, the cold air will be blocked to a certain extent when blowing out, and then flow back to the indoor heat exchanger, thereby affecting its heat exchange efficiency. And under the condition of the same cooling capacity, the coil temperature can be kept lower, and the rate of condensate generation on the fin surface of the indoor heat exchanger can also be increased, realizing more efficient self-cleaning.

[0119] In an exemplary embodiment, the controller is further configured to:

[0120] After the coil temperature is less than or equal to the current dew point temperature for a second preset duration, at least one of the first rotational speed, the second rotational speed, the opening degree of the throttling device, and the compressor frequency is adjusted until the indoor temperature meets the target temperature and the coil temperature meets the current dew point temperature.

[0121] It can be understood that after the coil temperature is less than or equal to the current dew point temperature for a second preset duration, the fin surface of the indoor heat exchanger has been effectively cleaned and flushed. Furthermore, by correspondingly adjusting the operating parameters of devices such as the first rotational speed, the second rotational speed, the opening degree of the throttling device, and the compressor frequency, it is ensured that the indoor temperature meets the target temperature and the coil temperature meets the current dew point temperature. That is, while ensuring that the indoor environment meets the user's cooling requirements, self-cleaning can also be achieved by covering the fin surface of the indoor heat exchanger with condensed water.

[0122] Exemplarily, one or more of the operating parameters of devices such as the first rotational speed, the second rotational speed, the opening degree of the throttling device, and the compressor frequency can be adjusted within their corresponding adjustable ranges to meet the above conditions. The adjustment method is not limited. It can be adjusted with a corresponding preset adjustment step, or it can be adjusted sequentially according to a certain adjustment order.

[0123] In some embodiments, for the situation where it is impossible to simultaneously make the indoor temperature meet the target temperature and the coil temperature meet the current dew point temperature, since the indoor heat exchanger has been effectively cleaned in the early stage, at this time, the indoor temperature can be preferentially ensured to meet the target temperature to ensure that the indoor environment meets the user's comfort requirements for cooling.

[0124] Among them, the specific value of the second preset duration is not limited either. It can be obtained through prior experiments how long it takes to effectively clean after the fin surface is covered with sufficient condensed water. At the same time, during the process of timing whether the coil temperature is less than or equal to the current dew point temperature reaches the second preset duration, if the indoor temperature seriously deviates from the target temperature, at least one of the first rotational speed, the second rotational speed, the opening degree of the throttling device, and the compressor frequency can also be adjusted to make the indoor temperature meet the target temperature. The situation where the indoor temperature seriously deviates from the target temperature can be judged by the way that the temperature difference between the indoor temperature and the target temperature exceeds the preset temperature difference threshold.

[0125] In an exemplary embodiment, referring to Figure 5 , it is a schematic flowchart of a control method for an air-conditioning device executed by the controller provided in the embodiment of the present application, specifically including steps 101 to 105, where:

[0126] Step 101: Receive and respond to a refrigeration start instruction, and control the air conditioning device to operate in a refrigeration mode until it reaches a target state, where the target state at least includes the indoor temperature reaching the target temperature corresponding to the refrigeration start instruction;

[0127] Step 102: Determine the current dew point temperature according to the indoor temperature and indoor humidity;

[0128] Step 103: Based on the current coil temperature, determine the first target temperature corresponding to when the first speed of the indoor fan is reduced to the lowest first speed;

[0129] Step 104: In the case where the first target temperature is less than or equal to the current dew point temperature, reduce the first speed until the coil temperature is less than or equal to the current dew point temperature;

[0130] Step 105: In the case where the first target temperature is greater than the current dew point temperature, adjust the device operation parameters of the outdoor unit until the coil temperature is less than or equal to the second target temperature, and reduce the first speed until the coil temperature is less than or equal to the current dew point temperature; wherein, the first target temperature determined based on the second target temperature is less than or equal to the current dew point temperature, and the device operation parameters include at least one of the second speed of the outdoor fan, the opening of the throttling device, and the compressor frequency.

[0131] In an exemplary embodiment, refer to Figure 6 , which is a schematic flowchart of a control method for an air conditioning device executed by the controller provided in the embodiment of the present application, specifically including Step 202 to Step 204, wherein:

[0132] Step 202: Determine the temperature drop value of the coil temperature corresponding to the reduction of the first speed from the current first speed to the lowest first speed;

[0133] Step 204: After reducing the coil temperature by the temperature drop value based on the current coil temperature, obtain the first target temperature.

[0134] In an exemplary embodiment, refer to Figure 7 , which is a schematic flowchart of a control method for an air conditioning device executed by the controller provided in the embodiment of the present application, specifically including Step 302 to Step 304, wherein:

[0135] Step 302: Obtain the indoor fan speed range to which the current first speed belongs;

[0136] Step 304: According to the indoor fan speed range and the preset corresponding relationship between the indoor fan speed range and the coil temperature drop value, determine the coil temperature drop value.

[0137] In an exemplary embodiment, refer to Figure 8, which is a schematic flow chart of a control method for an air conditioning device executed by the controller provided in the embodiment of the present application, specifically including steps 402 to 406, where:

[0138] Step 402, when the first target temperature is greater than the current dew point temperature, obtain the temperature difference between the first target temperature and the current dew point temperature;

[0139] Step 404, determine the adjustable range corresponding to the operating parameters of each device based on the temperature difference;

[0140] Step 406, increase the operating parameters of each device by the corresponding adjustable range until the first target temperature determined by the coil temperature is less than or equal to the current dew point temperature.

[0141] In an exemplary embodiment, refer to Figure 9 , which is a schematic flow chart of a control method for an air conditioning device executed by the controller provided in the embodiment of the present application, specifically including steps 502 to 506, where:

[0142] Step 502, increase the second speed by the adjustable range corresponding to the second speed;

[0143] Step 504, if after the first preset duration, the coil temperature is greater than the second target temperature, open the throttle device by the adjustable range corresponding to the throttle device opening;

[0144] Step 506, if after the first preset duration, the coil temperature is greater than the second target temperature, increase the compressor frequency by the adjustable range corresponding to the compressor frequency.

[0145] In an exemplary embodiment, refer to Figure 10 , which is a schematic flow chart of a control method for an air conditioning device executed by the controller provided in the embodiment of the present application, specifically including steps 602 to 604, where:

[0146] Step 602, determine the target adjustment range according to the target temperature difference range to which the temperature difference belongs and the corresponding relationship between the temperature difference range and the adjustment range preset;

[0147] Step 604, if the parameter value of increasing the target adjustment range exceeds the upper limit value of the device operating parameter, use the difference between the upper limit value and the current parameter value as the adjustable range, otherwise, use the target adjustment range as the adjustable range.

[0148] In an exemplary embodiment, a control method for an air conditioning device executed by the controller provided in the embodiment of the present application specifically includes: gradually reducing the first speed of the indoor fan by a preset speed step until the coil temperature is less than or equal to the current dew point temperature.

[0149] In an exemplary embodiment, a control method for an air conditioning device executed by the controller provided in the embodiments of the present application specifically includes: when the first target temperature is less than or equal to the current dew point temperature, adjusting the angle of the air deflector to the minimum angle.

[0150] In an exemplary embodiment, a control method for an air conditioning device executed by the controller provided in the embodiments of the present application specifically includes: after the coil temperature is less than or equal to the current dew point temperature for a second preset duration, adjusting at least one of the first speed, the second speed, the opening of the throttling device, and the compressor frequency until the indoor temperature meets the target temperature and the coil temperature meets the current dew point temperature.

[0151] In a specific embodiment, please refer to Figure 1 and Figure 11 , an air conditioning device is provided, which specifically includes an outdoor unit 1 and an indoor unit 2, and the two are connected through a refrigerant circuit. The internal components of the air conditioning device at least include: a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, a throttling device 14, an indoor heat exchanger 15, an indoor fan 16, and an outdoor fan 17. Among them, at least a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, a throttling device 14, and an outdoor fan 17 are provided in the outdoor unit 1, and at least an indoor heat exchanger 15 and an indoor fan 16 are provided in the indoor unit 2. The refrigerant circuit allows the refrigerant to circulate successively through the compressor 11, the outdoor heat exchanger 13, the throttling device 14, and the indoor heat exchanger 15. The indoor unit 2 is further provided with an air deflector 20, and the air deflector 20 is arranged at the air outlet B of the indoor unit 2.

[0152] Among them, the air conditioning device is further provided with an indoor sensor assembly 18, which is configured to detect indoor environmental data, and the indoor environmental data includes indoor temperature and indoor humidity. The air conditioning device is further provided with a coil temperature sensor 19, which is configured to detect the coil temperature of the indoor heat exchanger 15. Among them, the indoor heat exchanger 15 may be a finned tube heat exchanger, with a copper (aluminum) tube as the heat exchange tube, and fins are installed outside the tube, greatly increasing the heat exchange area on the air side and improving the heat exchange efficiency. The coil temperature sensor 19 may be arranged at any position on the outer wall of the above-mentioned heat exchange tube for detecting the surface temperature of the heat exchange tube, that is, the coil temperature.

[0153] Referring to Figure 11 shown, another control method for an air conditioning device executed by the controller provided in the embodiments of the present application specifically includes the following steps:

[0154] S1, the air conditioning device receives and responds to a refrigeration start instruction to turn on, and starts to operate in a refrigeration mode according to the refrigeration start instruction;

[0155] S2, detecting the indoor temperature, indoor humidity, and coil temperature;

[0156] S3. Determine whether the target state is reached based on the indoor temperature, i.e., the indoor temperature ≤ T0, and the preferred value of T0 is the target temperature plus 1°C. If not, it means the target state is not reached, then continue to execute S3 and continuously determine whether the target state is reached based on the real-time indoor temperature. If so, it means the target state is reached, and proceed to S4;

[0157] S4. Determine the current dew point temperature based on the indoor temperature and indoor humidity. Judge whether directly reducing the first speed of the indoor fan can cause the coil temperature to drop below the current dew point temperature, i.e., the coil temperature ≤ the current dew point temperature + TX, where TX is the temperature drop value of the coil temperature corresponding to the first speed reduced from the current first speed to the lowest first speed. If so, it indicates that in the current state, directly reducing the first speed can cause the coil temperature to drop below the current dew point temperature, and proceed to S5; if not, it indicates that in the current state, directly reducing the first speed cannot cause the coil temperature to drop below the current dew point temperature, and proceed to S7;

[0158] S5. Gradually reduce the first speed until the detected coil temperature ≤ the current dew point temperature, and adjust the air deflector to the minimum angle;

[0159] S6. After the coil temperature ≤ the current dew point temperature is satisfied for the second preset duration, adjust at least one of the first speed, the second speed, the opening degree of the throttling device, and the compressor frequency to keep the indoor temperature meet the target temperature and the coil temperature meet the current dew point temperature;

[0160] S7. Judge whether the second speed of the outdoor fan is adjustable. If adjustable, proceed to S8; if not adjustable, proceed to S9;

[0161] S8. Increase the second speed by the adjustable range corresponding to the calculated second speed, and return to S4;

[0162] S9. Judge whether the opening degree of the throttling device is adjustable. If adjustable, proceed to S10; if not adjustable, proceed to S11;

[0163] S10. Increase the opening degree of the throttling device by the adjustable range corresponding to the calculated opening degree of the throttling device, and return to S4;

[0164] S11. Judge whether the compressor frequency is adjustable. If adjustable, proceed to S12; if not adjustable, proceed to S13;

[0165] S12. Increase the compressor frequency by the adjustable range corresponding to the calculated compressor frequency, and return to S4;

[0166] S13. Determine that this air conditioner model is not suitable for self-cleaning of the indoor heat exchanger, and end the process.

[0167] In this embodiment, during the normal refrigeration operation of the air conditioner, when the indoor temperature drops to near the target temperature (preferably the set temperature +1°C), the real-time indoor temperature and indoor humidity are collected, the current dew point temperature is calculated, and based on the first speed of the current indoor fan, it is estimated whether the coil temperature can meet the requirement of being less than or equal to the dew point temperature after the first speed is gradually reduced to the lowest first speed (the coil temperature is related to the speed of the indoor fan). If the condition can be met, the first speed of the indoor fan is directly reduced step by step until the lowest speed, and at the same time, the air deflector is adjusted to the minimum angle; if the condition cannot be met, the second speed of the outdoor fan, the opening degree of the throttling device or the compressor frequency is increased to meet the above condition; in this way, it can not only ensure that there is enough condensed water on the indoor heat exchanger to wash the fins and the surface of the copper tube, but also maintain the refrigeration effect of the room. Moreover, the above self-cleaning process is carried out simultaneously during each refrigeration operation, cleaning while refrigerating, which can timely take away foreign matters, effectively clean the fins and copper tubes in the long term, reduce fin corrosion and copper tube oxidation, improve the heat exchange efficiency, and at the same time reduce the generation of peculiar smell in the air conditioning equipment, enhancing the user's comfort level.

[0168] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this application.

[0169] The above-described embodiments merely represent several implementation manners of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limitations on the patent scope of this application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application should be subject to the appended claims.

Claims

1. An air conditioning device, characterized in that, Comprising: An outdoor unit, which is connected to an indoor unit through a refrigerant circuit. The outdoor unit is at least provided with a compressor, an outdoor heat exchanger, a throttling device and an outdoor fan. The indoor unit is at least provided with an indoor heat exchanger and an indoor fan. The refrigerant circuit allows the refrigerant to circulate successively through the compressor, the outdoor heat exchanger, the throttling device and the indoor heat exchanger; An indoor sensor assembly, configured to detect indoor environmental data, where the indoor environmental data includes indoor temperature and indoor humidity; A coil temperature sensor, configured to detect the coil temperature of the indoor heat exchanger; A controller, communicatively connected to the indoor sensor assembly and the coil temperature sensor, and configured to: Receive and respond to a refrigeration start instruction, and control the air conditioning device to operate in a refrigeration mode until a target state is reached, where the target state includes the indoor temperature reaching the target temperature corresponding to the refrigeration start instruction; Determine the current dew point temperature according to the indoor temperature and the indoor humidity; Based on the current coil temperature, determine a first target temperature corresponding to when the first speed of the indoor fan is reduced to the lowest first speed; In the case where the first target temperature is less than or equal to the current dew point temperature, reduce the first speed until the coil temperature is less than or equal to the current dew point temperature; In the case where the first target temperature is greater than the current dew point temperature, increase the operating parameters of the components of the outdoor unit until the coil temperature is less than or equal to a second target temperature, and then reduce the first speed until the coil temperature is less than or equal to the current dew point temperature. Wherein, the first target temperature determined based on the second target temperature is less than or equal to the current dew point temperature, and the operating parameters of the components include at least one of the second speed of the outdoor fan, the opening degree of the throttling device and the compressor frequency.

2. The air conditioning equipment according to claim 1, characterized in that The controller is further configured to: Determine the temperature drop value of the coil temperature corresponding to the reduction of the first speed from the current first speed to the lowest first speed; After reducing the coil temperature by the temperature drop value based on the current coil temperature, obtain the first target temperature.

3. The air conditioning device according to claim 2, wherein, The controller is further configured to: Obtain the indoor fan speed range to which the current first speed belongs; According to the indoor fan speed range and the preset corresponding relationship between the indoor fan speed range and the coil temperature drop value, determine the coil temperature drop value.

4. The air-conditioning device according to claim 1, wherein, The controller is further configured to: In the case where the first target temperature is greater than the current dew point temperature, obtain the temperature difference between the first target temperature and the current dew point temperature; Based on the temperature difference, determine the adjustable range corresponding to each of the operating parameters of the components; Increase each of the operating parameters of the components with the corresponding adjustable range until the first target temperature determined by the coil temperature is less than or equal to the current dew point temperature.

5. The air conditioning equipment according to claim 4, characterized in that, The controller is further configured to: Increase the second speed with the adjustable range corresponding to the second speed; If after a first preset time period, the coil temperature is greater than the second target temperature, open the throttling device with the adjustable range corresponding to the opening degree of the throttling device; If after the first preset duration, the temperature of the coil is greater than the second target temperature, increase the compressor frequency by an adjustable amplitude corresponding to the compressor frequency.

6. The air conditioning device according to claim 4, characterized in that, The controller is further configured to: Determine a target adjustment amplitude according to the target temperature difference range to which the temperature difference belongs and the corresponding relationship between the preset temperature difference range and the adjustment amplitude; If the parameter value of increasing the target adjustment amplitude exceeds the upper limit value of the device operating parameters, use the difference between the upper limit value and the current parameter value as the adjustable amplitude; otherwise, use the target adjustment amplitude as the adjustable amplitude.

7. The air-conditioning device according to any one of claims 1 to 6, characterized in that, The controller is further configured to: Gradually reduce the first speed of the indoor fan by a preset speed step until the temperature of the coil is less than or equal to the current dew point temperature.

8. The air-conditioning equipment according to any one of claims 1 to 6, characterized in that, A wind deflector is provided at the air outlet of the indoor unit; The controller is further configured to: When the first target temperature is less than or equal to the current dew point temperature, adjust the angle of the wind deflector to the minimum angle.

9. The air conditioning equipment according to any one of claims 1 to 6, characterized in that The controller is further configured to: After the temperature of the coil is less than or equal to the current dew point temperature for a second preset duration, adjust at least one of the first speed, the second speed, the opening of the throttling device, and the compressor frequency until the indoor temperature meets the target temperature and the temperature of the coil meets the current dew point temperature.

10. A control method for an air conditioning device, characterized in that, The method includes: Receiving and responding to a refrigeration start instruction, controlling the air conditioning device to operate in a refrigeration mode until a target state is reached, the target state including that the indoor temperature reaches the target temperature corresponding to the refrigeration start instruction; Determine the current dew point temperature according to the indoor temperature and the indoor humidity; Based on the current coil temperature, determine the first target temperature corresponding to the first speed of the indoor fan when it is reduced to the lowest first speed; When the first target temperature is less than or equal to the current dew point temperature, reduce the first speed until the temperature of the coil is less than or equal to the current dew point temperature; When the first target temperature is greater than the current dew point temperature, increase the device operating parameters of the outdoor unit until the temperature of the coil is less than or equal to the second target temperature, and reduce the first speed until the temperature of the coil is less than or equal to the current dew point temperature; wherein, the first target temperature determined based on the second target temperature is less than or equal to the current dew point temperature, and the device operating parameters include at least one of the second speed of the outdoor fan, the opening of the throttling device, and the compressor frequency.

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