Multi-split air conditioner self-cleaning method and multi-split air conditioner system

Abstract

The invention discloses a self-cleaning method and system for a multi-split air conditioner, and relates to the technical field of air conditioners, the multi-split air conditioner comprises an air conditioner outdoor unit and a plurality of air conditioner indoor units, and the method comprises the following steps that the air conditioner indoor units obtain refrigeration instructions of the air conditioner outdoor unit, and the air conditioner indoor units conduct refrigeration according to the refrigeration instructions, so that the air conditioner indoor units are frosted; when the air conditioner indoor units conduct refrigeration, the heat exchanger outlet pipe temperature of each air conditioner indoor unit is obtained, the highest temperature value in the multiple heat exchanger outlet pipe temperatures serves as the first target temperature, the operation frequency of a compressor of the air conditioner outdoor unit is adjusted, and the operation rotating speed of a draught fan of each air conditioner indoor unit is adjusted, so that the air conditioner indoor units are frosted continuously, and the frosting amount is increased; the air conditioner indoor unit carries out heating according to the heating instruction, so that the air conditioner indoor unit is defrosted; and when defrosting of the air conditioner indoor unit is completed, the air conditioner indoor unit conducts continuous heating according to the heating instruction, the temperature of the air conditioner indoor unit reaches the target sterilization temperature, and therefore high-temperature sterilization is conducted on the air conditioner indoor unit.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a self-cleaning method for a multi-split air conditioner and a multi-split air conditioner system. Background Art

[0002] In recent years, with the improvement of people's living standards, consumption concepts are also changing. People not only pay attention to the beauty of home decoration, but also pay more and more attention to indoor air quality, which has led to the increasing share of multi-split units in the home decoration market, and the self-cleaning function of multi-split units is gradually becoming a standard feature.

[0003] However, a multi-split system is an outdoor unit that is paired with multiple indoor units. When entering self-cleaning mode, if the indoor units are self-cleaned one by one, the cleaning time will be too long. If they enter self-cleaning mode at the same time, it is easy for some indoor units to frost for a short time and the cleaning effect will be poor. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a self-cleaning method for a multi-split air conditioner, which can self-clean multiple indoor units at the same time and ensure a good cleaning effect.

[0005] The present invention also proposes a multi-split air conditioning system using the multi-split air conditioning self-cleaning method.

[0006] According to a multi-split air conditioner self-cleaning method according to a first aspect of an embodiment of the present invention, the multi-split air conditioner comprises an air conditioner outdoor unit and a plurality of air conditioner indoor units, and the multi-split air conditioner self-cleaning method comprises the following steps:

[0007] The air conditioner indoor unit obtains a cooling instruction from the air conditioner outdoor unit, and the air conditioner indoor unit performs cooling according to the cooling instruction, so that the air conditioner indoor unit is frosted;

[0008] When the air conditioner indoor unit is cooling, the outlet temperature of the heat exchanger of each air conditioner indoor unit is obtained, the highest temperature value among the multiple outlet temperatures of the heat exchanger corresponding to the multiple air conditioner indoor units is used as the first target temperature, the operating frequency of the compressor of the air conditioner outdoor unit is adjusted, and the operating speed of the fan of each air conditioner indoor unit is adjusted at the same time, so that the air conditioner indoor unit continues to be frosted;

[0009] The air conditioner indoor unit obtains a heating instruction of the air conditioner outdoor unit, and the air conditioner indoor unit performs heating according to the heating instruction, so that the air conditioner indoor unit performs defrosting;

[0010] When defrosting of the air conditioner indoor unit is completed, the air conditioner indoor unit continues to heat according to the heating instruction, so that the temperature of the air conditioner indoor unit reaches the target sterilization temperature.

[0011] According to the self-cleaning method of a multi-split air conditioner according to an embodiment of the present invention, there is at least the following beneficial effect: in the steps of the self-cleaning method of a multi-split air conditioner, when the indoor unit of the air conditioner is performing refrigeration and frosting, by obtaining the outlet pipe temperature of the heat exchanger of each indoor unit of the air conditioner, the highest temperature value among the multiple outlet pipe temperatures of the heat exchanger corresponding to the multiple indoor units of the air conditioner is used as the first target temperature, and the first target temperature is used as a reference to control the operating frequency of the compressor and the operating speed of the fan of the indoor unit of the air conditioner. By using the highest temperature value among the multiple outlet pipe temperatures of the heat exchanger as the first target temperature, it can be ensured that the evaporator temperatures of the multiple indoor units of the air conditioner all meet the frosting temperature conditions, thereby ensuring that the indoor units of the air conditioner are continuously frosted and reach a frosting amount that meets the cleaning effect; when the indoor unit of the air conditioner is performing heating and defrosting, more defrosting water can be generated to clean the outer surface of the evaporator, thereby improving the cleaning effect.

[0012] According to some embodiments of the present invention, the step of adjusting the operating frequency of the compressor of the air conditioner outdoor unit includes:

[0013] determining a first target frequency of the compressor according to a first target temperature;

[0014] The initial frequency of the compressor is adjusted according to the first target frequency so that the upper limit of the first target temperature is less than a preset temperature, and the preset temperature is less than 0°C.

[0015] According to some embodiments of the present invention, the step of adjusting the operating wind speed of the fan of each of the air conditioner indoor units includes:

[0016] Presetting a first operating speed of the fan of the indoor unit of the air conditioner;

[0017] When the air conditioner indoor unit is cooling, obtaining the operating speed of each fan;

[0018] The operating speed of the fan is adjusted according to the first operating speed, so that the operating speed of the fan is adjusted to the first operating speed.

[0019] According to some embodiments of the present invention, the multi-split air conditioner self-cleaning method further comprises the following steps:

[0020] When the air conditioner indoor unit performs cooling, obtaining the heat exchanger inlet pipe temperature of each air conditioner indoor unit;

[0021] The opening of the electronic expansion valve of the multi-split air conditioner is adjusted to make the outlet pipe temperature of the heat exchanger equal to the inlet pipe temperature of the heat exchanger.

[0022] According to some embodiments of the present invention, the step of adjusting the opening of the electronic expansion valve of the multi-split air conditioner includes:

[0023] Preset a second running time for the air conditioner indoor unit to continue cooling;

[0024] When the outlet pipe temperature of the heat exchanger is less than or equal to the preset temperature for the second operating time, the electronic expansion valve of the air conditioner indoor unit is controlled to close, so that the air conditioner indoor unit enters the air supply mode.

[0025] According to some embodiments of the present invention, the step of adjusting the opening of the electronic expansion valve of the multi-split air conditioner further comprises:

[0026] Preset a third operating time for the last indoor unit of the air conditioner to continue cooling and frosting, the third operating time being less than the second operating time;

[0027] The outlet pipe temperature of the heat exchanger of the air conditioner is obtained. When the outlet pipe temperature of the heat exchanger of the air conditioner is less than or equal to the preset temperature for the third operating time, the opening of the electronic expansion valve is increased and the operating frequency of the compressor is reduced.

[0028] According to some embodiments of the present invention, the step of heating the indoor unit of the air conditioner according to the heating instruction includes:

[0029] The step of heating the indoor unit of the air conditioner according to the heating instruction comprises:

[0030] Presetting a fourth operating time of the compressor of the air conditioner outdoor unit;

[0031] In response to the heating instruction, the fan of the air conditioner indoor unit is controlled to stop running, the reversing valve of the multi-split air conditioner is controlled to reverse, and the compressor is controlled to increase the operating frequency and continue to run for the fourth operating time, so that the air conditioner indoor unit is defrosted.

[0032] According to some embodiments of the present invention, the steps after defrosting of the indoor unit of the air conditioner is completed include:

[0033] Preset a first saturation temperature and a second saturation temperature of the refrigerant of the multi-split air conditioner, the first saturation temperature and the second saturation temperature are condensation temperatures at which the refrigerant is liquefied, and the first saturation temperature is lower than the second saturation temperature;

[0034] Determining a sterilization operation frequency of the compressor according to the target sterilization temperature;

[0035] The sterilization operation frequency of the compressor is adjusted according to the target sterilization temperature so that the inlet pipe temperature of the heat exchanger is equal to or greater than the target sterilization temperature, and the target sterilization temperature is greater than the first saturation temperature and less than the second saturation temperature.

[0036] According to some embodiments of the present invention, after defrosting of the indoor unit of the air conditioner is completed, the steps further include:

[0037] Preset a fifth operation time for continuous heating of the air conditioner indoor unit, preset a sixth operation time for the fan of the air conditioner indoor unit to operate, and preset a second operation speed for the fan of the air conditioner indoor unit to operate;

[0038] acquiring the heat exchanger inlet pipe temperature, and when the heat exchanger inlet pipe temperature is greater than or equal to the target sterilization temperature for the fifth operating time, controlling the fan of the air conditioner indoor unit to operate at the second operating speed;

[0039] After the fan of the indoor unit of the air conditioner runs at the second operating speed for the sixth operating time, the multi-split air conditioner exits the self-cleaning program.

[0040] According to the multi-split air-conditioning system of the second aspect embodiment of the present invention, the multi-split air-conditioning system includes an air-conditioning indoor unit and an air-conditioning outdoor unit, and the multi-split air-conditioning system also includes an operation control device, the operation control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the multi-split air-conditioning self-cleaning method described in any one of the first aspect above is implemented.

[0041] The multi-split air-conditioning system according to the embodiment of the present invention has at least the following beneficial effects: when the operation control device of the multi-split air-conditioning system executes the computer program on its memory, it can implement the multi-split air-conditioning self-cleaning method described in any one of the first aspects above, thereby increasing the amount of frost on the evaporator of the air-conditioning indoor unit of the multi-split air-conditioning, and then increasing the defrost water to improve the cleaning effect of the air-conditioning indoor unit.

[0042] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0044] Figure 1 A schematic diagram of a process of entering a self-cleaning mode of a multi-split air conditioner self-cleaning method according to an embodiment of the present invention;

[0045] Figure 2 A schematic flow chart of a self-cleaning method for a multi-split air conditioner according to an embodiment of the present invention;

[0046] Figure 3 for Figure 2A schematic diagram of the refrigeration and frosting process of a multi-split air conditioner self-cleaning method is shown;

[0047] Figure 4 for Figure 2 A schematic diagram of the heating, defrosting and high-temperature sterilization process of a multi-split air conditioner self-cleaning method is shown. DETAILED DESCRIPTION

[0048] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0049] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated 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 operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0051] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0052] Reference Figure 1 to Figure 2 According to the multi-split air conditioner self-cleaning method of the first embodiment of the present invention, the multi-split air conditioner includes an air conditioner outdoor unit and a plurality of air conditioner indoor units, and the multi-split air conditioner self-cleaning method includes the following steps:

[0053] The indoor unit of the air conditioner obtains a cooling instruction from the outdoor unit of the air conditioner, and the indoor unit of the air conditioner performs cooling according to the cooling instruction, so that the indoor unit of the air conditioner is frosted;

[0054] When the air conditioner indoor unit is cooling, the outlet temperature of the heat exchanger of each air conditioner indoor unit is obtained, the highest temperature value among the multiple outlet temperatures of the heat exchangers corresponding to the multiple air conditioner indoor units is used as the first target temperature, the operating frequency of the compressor of the air conditioner outdoor unit is adjusted, and the operating speed of the fan of each air conditioner indoor unit is adjusted at the same time, so that the air conditioner indoor unit continues to frost;

[0055] The indoor unit of the air conditioner obtains the heating instruction of the outdoor unit of the air conditioner, and the indoor unit of the air conditioner performs heating according to the heating instruction, so that the indoor unit of the air conditioner is defrosted;

[0056] When the defrosting of the air conditioner indoor unit is completed, the air conditioner indoor unit continues to heat according to the heating instruction, so that the temperature of the air conditioner indoor unit reaches the target sterilization temperature.

[0057] In this embodiment, the multi-split air conditioner self-cleaning method can effectively automatically clean the multi-split air conditioner system, thereby improving the use efficiency and sanitation level of the air conditioner. Specifically, the multi-split air conditioner system includes an air conditioner outdoor unit and multiple (at least two) air conditioner indoor units. The air conditioner outdoor unit is mainly responsible for sending cooling and heating instructions, as well as the operation control of the compressor. The air conditioner indoor unit performs cooling, heating and self-cleaning operations according to the instructions of the outdoor unit, and each air conditioner indoor unit is equipped with a fan for adjusting the flow of indoor air.

[0058] According to the above steps, first, the air conditioner indoor unit obtains the refrigeration instruction sent by the air conditioner outdoor unit. This instruction is the first step to start the self-cleaning process, and is used to tell the air conditioner indoor unit to start the refrigeration operation according to the refrigeration instruction. After receiving the refrigeration instruction, the air conditioner indoor unit will perform refrigeration according to the preset program, so that the surface of the evaporator of the air conditioner indoor unit begins to condense and frost. The purpose of frosting is to use the melting of frost to remove the dirt and bacteria on the evaporator in the subsequent defrosting process. It should be emphasized that when the air conditioner indoor unit is refrigerating, the highest temperature value among the multiple heat exchanger outlet pipe temperatures corresponding to the multiple air conditioner indoor units can be used as the first target temperature, and the compressor operating frequency of the air conditioner outdoor unit can be adjusted with the first target temperature to maintain a stable refrigeration effect. At the same time, the fan operating speed of each air conditioner indoor unit will also be adjusted to ensure that the flow of air inside the air conditioner indoor unit can drive the flow of indoor air to maintain continuous frost on the evaporator surface, and prepare for the subsequent defrosting and sterilization stages.

[0059] Then, when the frost on the air conditioner indoor unit reaches a certain level (the amount of frost reaches the preset requirement or the frost time reaches the preset time), the air conditioner outdoor unit will send a heating command to the air conditioner indoor unit. After receiving the heating command, the air conditioner indoor unit will immediately switch from cooling mode to heating mode and start the defrosting operation. During the heating process, the frost on the evaporator will melt quickly, and the melted defrosting water can clean and take away the dirt and bacteria on the surface of the evaporator. The melted water will be discharged to the outside through the drainage system of the air conditioner indoor unit, thus completing the first step of self-cleaning.

[0060] Then, after defrosting is completed, the indoor unit of the air conditioner continues to heat according to the heating instructions of the outdoor unit of the air conditioner, so that the temperature of the indoor unit of the air conditioner gradually rises to reach the target sterilization temperature. This temperature is usually set within a range that can effectively kill bacteria but will not cause damage to the indoor unit of the air conditioner. Through continuous heating, the bacteria inside the indoor unit of the air conditioner will be killed by high temperature, thereby achieving the purpose of sterilization.

[0061] It should also be noted that during the self-cleaning process, the communication between the air conditioner outdoor unit and the air conditioner indoor unit must remain unobstructed to ensure the accurate transmission and execution of the instructions. In the refrigeration and frosting stage, when adjusting the compressor operating frequency and the fan operating speed, fine-tuning should be performed according to the actual situation, such as taking the highest temperature value among the multiple heat exchanger outlet pipe temperatures corresponding to the multiple air conditioner indoor units as the first target temperature, and adjusting the compressor operating frequency by the first target temperature. At the same time, it should be ensured that each air conditioner indoor unit of the multi-split air conditioner can be refrigerated and frosted, and the operating speed of the fan should ensure the air flow inside the air conditioner indoor unit to drive the flow of indoor air to ensure that the evaporator can be frosted normally, and finally ensure the smooth progress of the self-cleaning process. In the high-temperature sterilization stage, the temperature of the air conditioner indoor unit should be strictly controlled to avoid excessively high or low temperatures from damaging the reliability of the air conditioner or incomplete sterilization. Through the multi-split air conditioner self-cleaning method of the present invention, the air conditioner indoor unit can be automatically cleaned and sterilized effectively, and the use efficiency and hygiene level of the air conditioner can be improved. At the same time, the method can also extend the service life of the air conditioner and reduce the cost of repair and maintenance.

[0062] Therefore, it can be understood that the self-cleaning method of a multi-split air conditioner according to an embodiment of the present invention has at least the following beneficial effects: in the steps of the self-cleaning method of a multi-split air conditioner, when the indoor unit of the air conditioner is performing refrigeration and frosting, the outlet pipe temperature of the heat exchanger of each indoor unit of the air conditioner is obtained, and the highest temperature value among the multiple heat exchanger outlet pipe temperatures corresponding to the multiple indoor units of the air conditioner is used as the first target temperature, and the first target temperature is used as a reference to control the operating frequency of the compressor and the operating speed of the fan of the indoor unit of the air conditioner. By using the highest temperature value among the multiple heat exchanger outlet pipe temperatures as the first target temperature, it can be ensured that the evaporator temperatures of the multiple indoor units of the air conditioner all meet the frosting temperature conditions, thereby ensuring that the indoor units of the air conditioner are continuously frosted and a frosting amount that satisfies the cleaning effect is achieved; when the indoor unit of the air conditioner is performing heating and defrosting, more defrosting water can be generated to clean the outer surface of the evaporator, thereby improving the cleaning effect.

[0063] It should also be noted that, referring to Figure 1Before the multi-split air conditioner enters the self-cleaning mode, the multi-split air conditioner is in the off state, that is, the indoor unit and the outdoor unit of the air conditioner are both in the off state, and one or more indoor units of the air conditioner enter the self-cleaning mode according to the self-cleaning instruction received in advance. At this time, the fan of the indoor unit of the air conditioner does not work, and the self-cleaning instruction is sent to the outdoor unit of the air conditioner. The outdoor unit of the air conditioner can send the self-cleaning instruction to all online indoor units of the air conditioner, so that the multi-split air conditioner as a whole enters the self-cleaning mode.

[0064] According to the self-cleaning instruction received in advance, one or more air-conditioning indoor units enter the self-cleaning mode respectively. The fan of the air-conditioning indoor unit does not work and sends the self-cleaning instruction to the air-conditioning outdoor unit. If the air-conditioning outdoor unit is not in the shutdown state at this time, the air-conditioning outdoor unit maintains the current working state and continues to work. The air-conditioning indoor unit or multiple air-conditioning indoor units with self-cleaning requirements remain in the shutdown state, waiting for the air-conditioning outdoor unit to enter the shutdown state. After the air-conditioning outdoor unit receives the shutdown instruction, the air-conditioning outdoor unit shuts down immediately, and then triggers the air-conditioning outdoor unit to send the self-cleaning instruction to all online air-conditioning indoor units, so that the multi-split air conditioner enters the self-cleaning mode. When the air-conditioning outdoor unit enters the self-cleaning mode, it sends the self-cleaning command to all other online air-conditioning indoor units, and all online air-conditioning indoor units enter the self-cleaning mode. At this point, the self-cleaning procedure of the multi-split air conditioner begins.

[0065] Further, refer to Figures 2 to 3 In some embodiments of the present invention, the step of adjusting the operating frequency of the compressor of the air conditioner outdoor unit includes:

[0066] After the compressor runs at the initial frequency for the first running time, the heat exchanger outlet pipe temperature of the evaporator of each air conditioner indoor unit is obtained, where the heat exchanger outlet pipe temperature is the temperature of the refrigerant when it flows out of the evaporator, and the highest temperature value of the heat exchanger outlet pipe temperature of the evaporator is used as the first target temperature;

[0067] determining a first target frequency of the compressor according to the first target temperature;

[0068] The initial frequency of the compressor is adjusted according to the first target frequency so that the upper limit of the first target temperature is less than a preset temperature, and the preset temperature is less than 0°C.

[0069] It can be seen from the above-mentioned embodiment of the multi-split air conditioner self-cleaning method that adjusting the operating frequency of the air conditioner outdoor unit compressor is one of the key steps to ensure the efficient self-cleaning process. Specifically:

[0070] At the beginning of the self-cleaning process, the compressor first runs for the first operating time at a preset initial frequency. This initial frequency is pre-set to ensure that the air-conditioning system can start smoothly and gradually enter the working state. The length of the first operating time can be adjusted according to the specific design and actual situation of the air-conditioning system, that is, it can be a fixed value, or it can be a variable value determined by the ambient temperature and the capacity of the external unit. Therefore, in some embodiments, the initial frequency of the compressor can take any value between 10Hz and 70Hz, such as 10Hz, 70Hz, 45Hz, etc., which is not specifically limited in this embodiment, as long as the air-conditioning system can start smoothly and gradually enter the working state.

[0071] Similarly, the first operating time mentioned above can also be pre-set to ensure that the air conditioning system can start smoothly and gradually enter the working state; at the same time, it is also necessary to ensure that the evaporator of the air conditioner indoor unit enters the working state stably and can obtain the temperature of the refrigerant at the coil inlet of the evaporator. Therefore, in this embodiment, the first operating time can also be not specifically limited, that is, the first operating time can be an operating time less than 10 minutes, such as 3 minutes or 10 minutes.

[0072] Then, after the compressor runs for the first time, the multi-split air conditioning system will obtain the heat exchanger outlet temperature of the evaporator of each air conditioner. This temperature is the temperature of the refrigerant just flowing out of the evaporator, which reflects the current working state and cooling effect of the evaporator. In order to obtain the accurate evaporator temperature, a temperature sensor can be installed at the outlet of the evaporator to monitor the temperature change of the refrigerant in real time.

[0073] Next, after obtaining the outlet temperature of the heat exchanger of each air conditioner evaporator, the system will compare these temperature values, find the highest outlet temperature, and use it as the first target temperature. Based on the determined first target temperature, the system will calculate the first target frequency of the compressor. This frequency is the optimal operating frequency that can keep the first target temperature within the preset temperature range. The preset temperature is a set value less than 0°C, which ensures that the evaporator can continue to frost at low temperatures, while avoiding system damage or energy efficiency reduction caused by too low temperature. Therefore, it can be understood that the purpose of this step is to ensure that in the subsequent frequency adjustment process, the highest heat exchanger outlet temperature can be used as the basis to ensure that the highest heat exchanger outlet temperature is lower than 0°C, so that the heat exchanger outlet temperature of all air conditioner indoor units can be lower than 0°C, so that the evaporators of all air conditioner indoor units can achieve the ideal frosting effect. The preset temperature can also take a set value less than 0°C, which can make the heat exchanger outlet temperature of the evaporator of all air conditioner indoor units lower, thereby improving the frosting effect and increasing the frosting amount.

[0074] After calculating the first target frequency, the system will adjust the initial frequency of the compressor according to this frequency. By adjusting the operating frequency of the compressor, the temperature of the evaporator can be accurately controlled so that the upper limit of the first target temperature is always less than the preset temperature. The implementation of this step relies on advanced control systems and precise algorithms to ensure the accuracy and stability of frequency regulation. After the compressor runs at the first target frequency, the system will continue to monitor the temperature changes of the evaporator of each air conditioner. If any abnormality or deviation from the preset temperature range is found, the system will immediately make corresponding adjustments to ensure the smooth progress of the self-cleaning process.

[0075] In summary, by precisely adjusting the operating frequency of the compressor, the multi-split air conditioner self-cleaning method described in the present invention can ensure that the evaporator continues to frost within an ideal temperature range, and increasing the amount of frost can lay a solid foundation for the subsequent defrosting and sterilization stages.

[0076] Furthermore, refer to Figures 2 to 3 In some embodiments of the present invention, the step of adjusting the operating wind speed of the fan of each indoor unit of the air conditioner includes:

[0077] Preset a first operating speed of the fan of the indoor unit of the air conditioner;

[0078] When the air conditioner indoor unit is cooling, obtain the operating speed of each fan;

[0079] The operating speed of the fan is adjusted according to the first operating speed, so that the operating speed of the fan is adjusted to the first operating speed.

[0080] It can be seen from the above-mentioned multi-split air conditioner self-cleaning method that adjusting the running wind speed of the fans of each air conditioner indoor unit is also one of the key steps to ensure the efficient self-cleaning process. Specifically:

[0081] Before the multi-split air conditioner enters the self-cleaning mode, it is first necessary to preset the first operating speed of the fan of each air conditioner indoor unit. This step can be completed through the control panel or remote controller of the air conditioning system. The setting of the first operating speed should be based on the model, rated power, and expected self-cleaning effect of the air conditioner indoor unit to ensure that the internal dust can be effectively removed without causing excessive wear on the air conditioner components. Usually, the first operating speed will be set to a low speed value that can ensure cleaning efficiency without generating excessive noise. It should be noted that the first operating speed can be 0 to 1500r / min, and the specific value can be comprehensively considered based on the model, rated power, and expected self-cleaning effect of the air conditioner indoor unit. It should also be noted that in the self-cleaning mode of the multi-split air conditioner in this embodiment, the first operating speed of the fan of the air conditioner indoor unit can be 250r / min. At this first operating speed, the wind speed generated by the fan of the air conditioner indoor unit can be small. When the self-cleaning mode is used in a cold weather environment where the indoor air is not expected to blow out cold wind, the small wind speed can reduce the cold feeling and improve the user experience. According to the above embodiment, the self-cleaning mode of the multi-split air conditioner is forcibly started when the air conditioner is turned off. It can be understood that when the self-cleaning mode forces the multi-split air conditioner to start, the wind speed generated by the fan of the air conditioner indoor unit is relatively small, thereby meeting the needs of users who do not want the indoor air to blow out cold air.

[0082] However, it should be emphasized that due to the different models and rated powers of the indoor units of the air conditioners, the first operating speed of the fan with a smaller wind speed generated by the fan of the indoor unit of the air conditioner will also be different. Therefore, in this embodiment, there is no specific limitation on the first operating speed, and it is sufficient to satisfy the effect that the wind speed generated by the fan is relatively small and there is no obvious blowing feeling.

[0083] When the air conditioner is started and enters the cooling mode, the system will automatically or through user instructions enter the preparation stage of the self-cleaning program. At this time, the control system will obtain the actual operating speed of each air conditioner fan in real time. This step is usually achieved through a built-in sensor, which can accurately monitor the rotation speed of the fan and transmit the data to the control system for analysis. After obtaining the current operating speed of all air conditioner fans, the control system will adjust the fan speed of each air conditioner according to the preset first operating speed. The adjustment process is achieved by controlling the working voltage or current of the motor to ensure that the fan speed smoothly transitions to the preset first operating speed. During this process, the control system needs to continuously monitor the fan speed changes until the operating speed of all fans reaches the preset value and remains stable. After the fan speed adjustment is completed, the airflow generated by the fan of the air conditioner at the first operating speed ensures that the indoor air flows while ensuring that there is no obvious blowing feeling, satisfying the user experience. The flow of air can drive the water molecules in the indoor air to follow the air through the evaporator, thereby increasing the amount of frost on the evaporator. It should be noted that the length of the self-cleaning frosting process can be set according to actual needs, and it is generally recommended not to exceed 30 minutes.

[0084] Reference Figures 2 to 3 In some embodiments of the present invention, the multi-split air conditioner self-cleaning method further comprises the following steps:

[0085] When the air conditioner is cooling, the heat exchanger inlet pipe temperature and heat exchanger outlet pipe temperature of each air conditioner are obtained. The heat exchanger inlet pipe temperature is the temperature when the refrigerant flows into the evaporator, and the heat exchanger outlet pipe temperature is the temperature when the refrigerant flows out of the evaporator.

[0086] Adjust the opening of the electronic expansion valve of the multi-split air conditioner to make the heat exchanger inlet pipe temperature equal to the heat exchanger outlet pipe temperature.

[0087] In this embodiment, specifically, when the air conditioner indoor unit performs cooling operation, the system will obtain the heat exchanger inlet pipe temperature and heat exchanger outlet pipe temperature of each air conditioner indoor unit in real time. The heat exchanger inlet pipe temperature refers to the temperature when the refrigerant just flows into the evaporator, which reflects the refrigerant state at the evaporator inlet; while the heat exchanger outlet pipe temperature refers to the temperature when the refrigerant flows out of the evaporator, which represents the refrigerant state at the evaporator outlet. In order to accurately obtain these two temperature values, temperature sensors can be installed at the inlet and outlet of the evaporator respectively to monitor the temperature changes of the refrigerant in real time.

[0088] After obtaining the heat exchanger inlet and outlet temperatures, the system will compare the two temperature values ​​and calculate the temperature difference between them. The size of the temperature difference directly reflects the flow state and refrigerant flow of the refrigerant inside the evaporator. If the temperature difference is too large, it means that the flow of refrigerant in the evaporator is not appropriate, which not only affects the frosting effect of the evaporator itself, but also affects the frosting effect of other air conditioners.

[0089] In order to reduce the temperature difference and improve the frosting effect of the evaporator, the system will adjust the opening of the electronic expansion valve of the multi-split air conditioner according to the calculated temperature difference. The electronic expansion valve is a key component for controlling the refrigerant flow. By adjusting its opening, the flow rate and flow of the refrigerant passing through the air conditioner can be changed, thereby improving the refrigerant distribution of different air conditioners in the entire multi-split air conditioner system and optimizing the frosting effect of the air conditioner. The system will automatically adjust the opening of the electronic expansion valve according to the preset algorithm and temperature difference threshold, so that the heat exchanger inlet pipe temperature and the heat exchanger outlet pipe temperature gradually become equal. It can be understood that during the refrigeration process, after the heat exchange of the evaporator, the heat exchanger outlet pipe temperature will be higher than the heat exchanger inlet pipe temperature. By adjusting its opening, the flow rate and flow rate of the refrigerant can be changed, so that the difference between the heat exchanger outlet pipe temperature and the heat exchanger inlet pipe temperature gradually approaches 0°C, that is, the heat exchanger outlet pipe temperatures gradually approach the same, thereby ensuring that no place in the entire evaporator will exceed the preset temperature in the above embodiment, that is, the maximum temperature will not exceed 0°C, thereby ensuring frost and the amount of frost.

[0090] After adjusting the opening of the electronic expansion valve, the system will continue to monitor the temperature changes of the evaporator of each air conditioner and make fine adjustments according to the actual situation. If the temperature difference is still large or the evaporator temperature does not reach the expected value, the system will adjust the opening of the electronic expansion valve again until the best cooling effect and self-cleaning state are achieved. Under the optimized cooling state, the frosting and defrosting process on the evaporator surface will be more uniform and efficient, thereby effectively improving the self-cleaning effect. After the self-cleaning process is completed, the system will automatically return to normal operation mode or standby state, waiting for the next self-cleaning instruction to be triggered.

[0091] Further, in some embodiments of the present invention, referring to Figures 2 to 3 The steps of adjusting the opening of the electronic expansion valve of the multi-split air conditioner include:

[0092] Preset the second running time for the air conditioner indoor unit to continue cooling;

[0093] The outlet temperature of the heat exchanger is obtained. When the outlet temperature of the heat exchanger is less than or equal to the preset temperature for a second operating time, the electronic expansion valve of the air conditioner indoor unit is controlled to close, so that the air conditioner indoor unit enters the air supply mode.

[0094] In this embodiment, specifically, during the execution of the multi-split air conditioner self-cleaning method, in order to accurately control the refrigeration effect of the evaporator and the progress of self-cleaning, the system will preset a second operating time for the air conditioner indoor unit to continue refrigerating. This time is set according to the model, refrigeration capacity, and self-cleaning requirements of the air conditioner indoor unit, and is intended to ensure that the evaporator has enough refrigeration time to form a stable frosting state (that is, the refrigeration and frosting time of each air conditioner indoor unit), laying the foundation for the subsequent self-cleaning process. It should be noted that in some embodiments, the second operating time can be 10 minutes to 60 minutes, specifically 25 minutes, and is set based on the model, refrigeration capacity, and self-cleaning requirements of the air conditioner indoor unit. The specific value is not specifically limited, and it can ensure the frosting time and frosting amount of the air conditioner indoor unit evaporator.

[0095] After the second operating time begins, the system will continue to obtain the heat exchanger outlet temperature of each air conditioner indoor unit. The heat exchanger outlet temperature is the temperature of the refrigerant when it flows out of the evaporator, which reflects the refrigeration effect and heat exchange status at the evaporator outlet. By real-time monitoring of the heat exchanger outlet temperature, the system can accurately judge the refrigeration condition of the evaporator and provide a basis for subsequent electronic expansion valve adjustment. Then, the system will compare the obtained heat exchanger outlet temperature with the preset temperature threshold. The preset temperature is a temperature value set according to the design parameters and self-cleaning requirements of the air conditioner indoor unit. It represents the ideal temperature state that the evaporator should reach during the self-cleaning process, such as the preset temperature mentioned in the aforementioned embodiment. If the heat exchanger outlet temperature is less than or equal to the preset temperature for the second operating time, it means that the refrigeration effect of the evaporator has reached or exceeded the level required for self-cleaning.

[0096] When the system determines that the outlet temperature of the heat exchanger meets the conditions, it will control the electronic expansion valve of the air conditioner indoor unit to close. The electronic expansion valve is a key component for controlling the refrigerant flow. Closing the electronic expansion valve can stop the flow of refrigerant, thereby stopping the evaporator from further cooling. The purpose of this step is to reduce the refrigeration load, transfer the cooling capacity to other indoor units that are still frosting, and prepare to enter the next self-cleaning stage. After the electronic expansion valve is closed, the air conditioner indoor unit will automatically enter the air supply mode. In the air supply mode, the fan of the air conditioner indoor unit is still running, but it no longer performs cooling or heating operations. Instead, it simply circulates and blows the indoor air, using the low-grade heat in the air for pre-defrosting.

[0097] It should be noted that when the system determines that the heat exchanger outlet pipe temperature of the evaporator of a certain air-conditioning unit meets the conditions, it will control the electronic expansion valve of the air-conditioning unit to close, so that the evaporator stops further cooling, and then allows the remaining refrigerant to flow to other online air-conditioning units, so as to facilitate the frost of the remaining air-conditioning units that have not reached the frost amount.

[0098] Through the above specific implementation, the multi-split air conditioner self-cleaning method can ensure that the evaporator reaches an ideal refrigeration state during the self-cleaning process, ensures the amount of frost, and thus improves the self-cleaning ability and performance stability of the air conditioning system by presetting the second operating time, real-time monitoring the heat exchanger outlet pipe temperature, judging the temperature relationship, controlling the electronic expansion valve to close, and entering the air supply mode.

[0099] Furthermore, in some embodiments of the present invention, referring to Figures 2 to 3 The step of adjusting the opening of the electronic expansion valve of the multi-split air conditioner also includes:

[0100] The third operation time for the last air conditioner indoor unit to continuously cool and frost is preset, and the third operation time is less than the second operation time;

[0101] The outlet pipe temperature of the heat exchanger of the evaporator of the indoor unit of the air conditioner is obtained. When the outlet pipe temperature of the heat exchanger of the indoor unit of the air conditioner is less than or equal to the preset temperature for a third consecutive operating time, the opening of the electronic expansion valve of the multi-split air conditioner is increased and the operating frequency of the compressor is reduced.

[0102] In this embodiment, the above-mentioned implementation method of the steps in this embodiment further refines the control logic of adjusting the opening of the electronic expansion valve to achieve a more accurate and efficient self-cleaning process.

[0103] First of all, it should be clear that the multi-split air conditioning system in this embodiment includes multiple air conditioner indoor units, each of which is equipped with an evaporator, and the system is provided with an electronic expansion valve for the air conditioner indoor unit and an electronic expansion valve and compressor for the air conditioner outdoor unit as key control components. In the steps of the above embodiment, the first operating time for preliminary refrigeration and frosting of the air conditioner indoor unit (the compressor runs at the initial frequency) and the second operating time for deep refrigeration and frosting have been set, and the opening of the electronic expansion valve and the operating frequency of the compressor are adjusted according to the temperature feedback of the evaporator.

[0104] A specific third operating time is preset in the system control program, which is used to define the duration of the last air conditioner indoor unit (or a specific air conditioner indoor unit that requires special attention) in the continuous refrigeration and frosting stage. It is important that this third operating time is set to be shorter than the second operating time. On the premise of ensuring the self-cleaning effect, it is intended to prevent the compressor from stopping after all air conditioner indoor units are switched to air supply mode. Therefore, the third operating time is set to be shorter than the second operating time, so that the last indoor unit exits the frosting stage before switching to air supply, the compressor reduces the frequency, and all online indoor units increase the opening of the electronic expansion valve and directly enter the stage of recovering liquid refrigerant, preparing for the next step of the compressor directly switching from cooling to heating mode without stopping.

[0105] It should be noted that, in this embodiment, the third operating time is less than the second operating time, and in some embodiments, the second operating time can be 10 minutes to 60 minutes, specifically 25 minutes, and is set based on the model, refrigeration capacity, and self-cleaning requirements of the air conditioner indoor unit. The specific value may not be specifically limited, as long as the frosting time and amount of the evaporator of the air conditioner indoor unit can be guaranteed. Therefore, the third operating time can be any value less than 60 minutes, as long as it is lower than the second operating time. Taking the second operating time of 25 minutes as an example, the third operating time can be 24 minutes, or 23 minutes 30 seconds, etc. The third operating time is closer to the second operating time, which can ensure a longer frosting time, thereby ensuring that the frosting of each air conditioner indoor unit is not much different, and ensuring that the cleaning effect is not much different.

[0106] During the refrigeration and frosting process of the indoor unit of the air conditioner, the temperature of the evaporator is monitored in real time by a temperature sensor and recorded as the outlet temperature of the heat exchanger. This step is to obtain real-time temperature data as a basis for subsequent adjustment of the operating parameters of the electronic expansion valve and the compressor. The system continuously monitors and records the outlet temperature of the heat exchanger to determine whether it continues to remain less than or equal to the preset temperature within a given third operating time. The preset temperature here is set in advance according to the design characteristics and self-cleaning requirements of the indoor unit of the air conditioner, such as the preset temperature mentioned in the aforementioned embodiment.

[0107] If the outlet temperature of the heat exchanger is continuously less than or equal to the preset temperature during the third operation time, it means that the current refrigeration and frosting effect has reached the preset frosting amount requirement. At this time, the system will automatically perform the following adjustment operations: reduce the operating frequency of the compressor; increase the opening of the electronic expansion valves of all online air conditioners to recover excess liquid refrigerant in the air conditioners, connecting pipes, etc., to prevent subsequent switching to the heating mode and liquid hammer when the four-way valve is switched. Furthermore, when the multi-split air conditioning system reduces the operating frequency of the compressor and increases the opening of the electronic expansion valves of all online air conditioners to recover excess liquid refrigerant in the air conditioners, connecting pipes, etc., the heating and defrosting procedure can be further performed.

[0108] It should also be noted that in the above steps of reducing the operating frequency of the compressor, the reduced operating frequency of the compressor can be reduced to a fixed operating frequency, which can take any value from 10Hz to 30Hz, and it is allowed to run for 0min to 10min (excluding 0min). In this embodiment, the fixed operating frequency of the compressor at this stage is not specifically limited, and the reduced operating frequency and operating time can slow down the liquefaction of the refrigerant and recover the liquid refrigerant. It can also be understood that in order to prevent the reversal of the four-way valve from being hit by the refrigerant liquid, the opening of the electronic expansion valve can also be opened to the maximum to recover the liquid refrigerant in the air conditioner indoor unit and the connecting pipe as soon as possible, so the opening of the electronic expansion valve can also be not specifically limited.

[0109] After adjustment, the system continues to monitor the temperature of the evaporator and the overall operating status of the system, and makes fine adjustments when necessary to ensure that the self-cleaning process proceeds smoothly and does not cause damage to the equipment. Through the above implementation, the multi-split air conditioning system can more finely control the frosting process of each air conditioner indoor unit when performing self-cleaning, which not only ensures the effect of self-cleaning, but also prevents the liquid refrigerant from affecting the four-way valve during the subsequent reversing, thereby improving the stability and service life of the system.

[0110] Reference Figure 2 as well as Figure 4 In some embodiments of the present invention, the step of heating the indoor unit of the air conditioner according to the heating instruction includes:

[0111] Presetting a fourth operating time of the compressor of the air conditioner outdoor unit;

[0112] In response to the heating instruction, the fan of the air conditioner indoor unit is controlled to stop running, the reversing valve of the multi-split air conditioner is controlled to reverse, and the compressor is controlled to increase the operating frequency and continue to run for a fourth operating time to defrost the air conditioner indoor unit.

[0113] In the steps of this embodiment, specifically, before implementing this method, it is first necessary to preset the fourth operating time of the compressor in the air conditioner outdoor unit. The fourth operating time is the defrosting time of the embodiment of the present invention. This time parameter is determined based on the specific configuration of the air conditioning system, ambient temperature, humidity, historical operating data and other factors, aiming to ensure that the defrosting process is both efficient and safe. For example, the fourth operating time can be set to a value between 0min and 10min based on experimental data or empirical values, and can be adjusted according to actual conditions, aiming to completely defrost the frost on the surface of the evaporator in the air conditioner indoor unit.

[0114] Control the air conditioner indoor fan to stop running: When the system receives a heating command and determines that defrosting is required, it first controls the air conditioner indoor fan to stop running. Subsequently, the control system will instruct the reversing valve to perform a reversing operation, so that the circulation path originally used for refrigeration is converted to a heating mode. This conversion is the key to achieving defrosting because it allows the system to use the heat of the outdoor unit to melt the frost on the indoor unit. After the reversal is completed, the control system will control the compressor to increase the operating frequency to a defrosting operating frequency to achieve the defrosting effect. The compressor will continue to operate at the defrosting frequency within the preset fourth operating time to ensure that the frost on the indoor unit can be fully melted. During this period, the system may monitor the defrosting progress in real time through a temperature sensor so that the operating parameters can be adjusted if necessary.

[0115] It should be noted that in the defrost stage, the compressor frequency is increased to the self-cleaning defrost operating frequency. The defrost operating frequency can range from 10 to 70 Hz. It can be a fixed value or a variable value determined by the ambient temperature and the external unit capacity. Specifically, the defrost operating frequency can be a fixed value of 30 Hz, which is not specifically limited in this embodiment.

[0116] Further, refer to Figure 2 as well as Figure 4 In some embodiments of the present invention, the step of continuously heating the indoor unit of the air conditioner according to the heating instruction includes:

[0117] Preset a first saturation temperature and a second saturation temperature of the refrigerant of the multi-split air conditioner, the first saturation temperature and the second saturation temperature are condensation temperatures at which the refrigerant is liquefied, and the first saturation temperature is lower than the second saturation temperature;

[0118] Determine the sterilization operation frequency of the compressor according to the target sterilization temperature;

[0119] The sterilization operation frequency of the compressor is adjusted according to the target sterilization temperature so that the inlet pipe temperature of the heat exchanger is equal to or greater than the target sterilization temperature, and the target sterilization temperature is greater than the first saturation temperature and less than the second saturation temperature.

[0120] In this embodiment, the specific implementation steps of the air conditioner indoor unit in the continuous heating process are described in detail, aiming to achieve efficient sterilization and self-cleaning functions through precise control. The specific implementation steps are as follows:

[0121] Determine the saturation temperature: First, according to the type of refrigerant used in the multi-split air-conditioning system, preset its first saturation temperature and second saturation temperature. These two temperatures are the condensation temperatures of the liquefied refrigerant, where the first saturation temperature is lower than the second saturation temperature. At the same time, in order to ensure a higher sterilization temperature, the first saturation temperature and the second saturation temperature are both between 45°C and 80°C. For example, for the commonly used R410A refrigerant, the first saturation temperature can be set to 58°C (or adjusted according to the specific refrigerant characteristics), and the second saturation temperature can be set to 60°C. Under the premise of ensuring system reliability, the first saturation temperature and the second saturation temperature can be as large as possible to ensure the effect of high-temperature sterilization. The setting of the first saturation temperature and the second saturation temperature is to ensure that during the sterilization process, the refrigerant can work within the appropriate temperature range, and the sterilization effect will not be poor due to too low a temperature, nor will the air conditioning system be damaged or its service life be affected due to too high a temperature.

[0122] Set the target sterilization temperature: According to the design of the air conditioning system and the sterilization requirements, preset a target sterilization temperature. This temperature should be higher than the first saturation temperature and lower than the second saturation temperature to ensure that the system can operate stably and will not cause excessive liquefaction or gasification of the refrigerant during sterilization. For example, the target sterilization temperature can be set to 58°C.

[0123] Calculate the sterilization operation frequency: Based on the target sterilization temperature, the compressor sterilization operation frequency is determined through the air conditioning system control algorithm or experimental data. This frequency should enable the evaporator temperature of the air conditioning system to reach or exceed the target sterilization temperature, thereby effectively killing bacteria. While the air conditioner indoor unit is continuously heating according to the heating instruction, the system should monitor the evaporator temperature and the operating status of the compressor in real time.

[0124] Adjustment of compressor operating frequency: According to real-time monitoring data, dynamically adjust the operating frequency of the compressor to ensure that the temperature of the first evaporator is always equal to or greater than the target sterilization temperature. This step is the key to the sterilization process. By accurately controlling the compressor frequency, the evaporator temperature can be finely adjusted to achieve the best sterilization effect.

[0125] To sum up, through the above specific implementation methods, the embodiments of the present invention provide an efficient and safe multi-split air conditioner self-cleaning method, which can achieve effective sterilization effect while continuing heating, thereby improving the overall performance of the air-conditioning system and user experience.

[0126] Reference Figure 2 as well as Figure 4 Furthermore, in some embodiments of the present invention, the step of the air conditioner indoor unit continuously heating according to the heating instruction further includes:

[0127] A fifth operation time for continuous heating of the indoor unit of the air conditioner is preset, a sixth operation time for the fan of the indoor unit of the air conditioner is preset, and a second operation speed for the fan of the indoor unit of the air conditioner is preset;

[0128] Acquire the heat exchanger inlet pipe temperature, and when the heat exchanger inlet pipe temperature is greater than or equal to the target sterilization temperature for a fifth operating time, control the fan of the air conditioner indoor unit to operate at a second operating speed;

[0129] After the fan of the indoor unit of the air conditioner runs at the second operating speed for the sixth operating time, the multi-split air conditioner exits the self-cleaning program.

[0130] This embodiment further refines the specific control steps of the air conditioner indoor unit during the continuous heating process, especially the setting of the fan running time and speed. The specific implementation steps are as follows:

[0131] First, preset the fifth operating time and the sixth operating time: before the indoor unit of the air conditioner starts continuous heating according to the heating instruction, first preset a fifth operating time. This time refers to the shortest time that the inlet pipe temperature of the heat exchanger needs to continuously reach or exceed the target sterilization temperature to ensure the sterilization effect. For example, the fifth operating time can be set to 25 to 60 minutes, but the shortest time can be as large as possible, such as 30 minutes for the fifth operating time. At the same time, preset the sixth operating time of the indoor fan of the air conditioner. This time refers to the time that the fan needs to continue to run after the high-temperature sterilization reaches the fifth operating time and runs to the second operating speed to ensure that the sterilization effect is consolidated and the air conditioner is fully ventilated. For example, the sixth operating time can be set to 0 to 10 minutes, and specifically the sixth operating time is 3 minutes.

[0132] Then, preset the second operating speed: preset the second operating speed of the air conditioner indoor fan. This speed should be higher than the speed in normal heating or cooling mode, and should also be operated at a lower speed. For example, the second operating speed can be set to 0 to 2000r / min. The lower speed can promote air circulation and ventilation inside the air conditioner while reducing the impact on users.

[0133] Obtain the temperature of the heat exchanger inlet pipe: During the continuous heating process of the air conditioner indoor unit, the system should obtain the temperature data of the first evaporator in real time. The system determines whether the temperature of the heat exchanger inlet pipe continues to reach or exceed the target sterilization temperature, and whether the duration reaches the preset fifth operating time. If these conditions are met, it means that the sterilization effect has reached the expected effect. When the temperature of the heat exchanger inlet pipe continues to reach or exceed the target sterilization temperature, and the duration reaches the fifth operating time, the system controls the fan of the air conditioner indoor unit to start running at the second operating speed to promote air circulation and ventilation inside the air conditioner. At the same time, the system should monitor the running time of the fan at the second operating speed in real time to ensure that it reaches the preset sixth running time. When the fan runs at the second operating speed for the sixth running time, the system determines that the self-cleaning program has been completed.

[0134] Exit the self-cleaning program: The system controls the multi-split air conditioner to exit the self-cleaning program and resume normal heating operation mode, cooling operation mode or shut down. At the same time, the system may also need to perform a series of follow-up operations, such as self-checking and cleaning, to ensure the normal operation of the air conditioning system and preparation for the next use.

[0135] To sum up, the present invention provides a more refined self-cleaning method for multi-split air conditioners. This method can ensure the sterilization effect while ensuring the stable operation of the air-conditioning system and user experience by presetting and controlling parameters such as the continuous heating time of the air-conditioning indoor unit, the fan operation time and speed.

[0136] According to a multi-split air-conditioning system (not shown in the figure) according to an embodiment of the second aspect of the present invention, the multi-split air-conditioning system includes an air-conditioning indoor unit and an air-conditioning outdoor unit of any one of the embodiments of the first aspect above, and the multi-split air-conditioning system also includes an operation control device, the operation control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the multi-split air-conditioning self-cleaning method of any one of the first aspect above is implemented.

[0137] The second aspect of the present invention also provides a multi-split air conditioning system, which includes not only the indoor air conditioner and the outdoor air conditioner of any one of the first aspect, but also an operation control device.

[0138] Specifically, the air conditioner indoor unit is responsible for regulating the indoor air, has functions such as heating, cooling, and dehumidification, and integrates the self-cleaning function components and sensors in the above-mentioned first aspect embodiment. The air conditioner outdoor unit is usually installed outdoors, responsible for providing a cold and heat source for the air conditioner indoor unit, and is connected to the air conditioner indoor unit through a refrigerant cycle. The operation control device mainly includes a memory, a processor, and a computer program stored on the memory and can be run on the processor. The operation control device is the command center of the entire multi-split air conditioning system, responsible for receiving user instructions, monitoring system status, executing control logic, etc. In the operation control device, the memory is used to store computer programs, system configuration information, historical data, etc. It should be noted that the storage space provided by the memory should be large enough to accommodate all necessary programs and data. The processor, as the core of the operation control device, is responsible for executing the computer program stored in the memory. The processor should have sufficient computing power and response speed to ensure the efficient operation of the system. Furthermore, the computer program is a collection of a series of instructions for instructing the processor on how to execute the multi-split air conditioner self-cleaning method. Therefore, the program should contain all the steps and logic of the self-cleaning method in any one of the embodiments of the first aspect above.

[0139] When the processor executes the computer program stored in the memory, the self-cleaning method in any one of the embodiments of the first aspect above will be implemented. The specific steps include:

[0140] Receiving user instructions: The operation control device receives the self-cleaning instructions issued by the user through the user interface or other input devices.

[0141] System detection: The processor controls the air conditioner indoor unit and air conditioner outdoor unit to perform necessary system detection to ensure the safe progress of the self-cleaning process.

[0142] Self-cleaning process execution: According to the preset logic and parameters, the processor controls the air conditioner to perform heating, cooling, dehumidification and other operations to achieve the self-cleaning effect. At the same time, the processor is also responsible for monitoring the operating status of the air conditioner indoor unit and the air conditioner outdoor unit to ensure the smooth progress of the self-cleaning process.

[0143] Process completion and feedback: When the self-cleaning process is completed, the processor controls the air conditioning system to resume normal operation and provides feedback to the user through the user interface or other output devices. The feedback may include the success or failure of the self-cleaning process, the current status of the system, etc.

[0144] Therefore, it can also be understood that the multi-split air-conditioning system according to the embodiment of the present invention has at least the following beneficial effects: when the operation control device of the multi-split air-conditioning system executes the computer program on its memory, it can implement the multi-split air-conditioning self-cleaning method of any one of the first aspects mentioned above, thereby increasing the amount of frost on the evaporator of the air-conditioning indoor unit of the multi-split air-conditioning, and then increasing the defrost water to improve the cleaning effect of the air-conditioning indoor unit.

[0145] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A self-cleaning method for a multi-split air conditioner, the multi-split air conditioner comprising an air conditioner outdoor unit and a plurality of air conditioner indoor units, characterized in that: The multi-split air conditioner self-cleaning method comprises the following steps: The air conditioner indoor unit obtains a cooling instruction from the air conditioner outdoor unit, and the air conditioner indoor unit performs cooling according to the cooling instruction, so that the air conditioner indoor unit is frosted; When the air conditioner indoor unit is cooling, the outlet temperature of the heat exchanger of each air conditioner indoor unit is obtained, the highest temperature value among the multiple outlet temperatures of the heat exchanger corresponding to the multiple air conditioner indoor units is used as the first target temperature, the operating frequency of the compressor of the air conditioner outdoor unit is adjusted, and the operating speed of the fan of each air conditioner indoor unit is adjusted at the same time, so that the air conditioner indoor unit continues to be frosted; The air conditioner indoor unit obtains a heating instruction of the air conditioner outdoor unit, and the air conditioner indoor unit performs heating according to the heating instruction, so that the air conditioner indoor unit performs defrosting; When defrosting of the air conditioner indoor unit is completed, the air conditioner indoor unit continues to heat according to the heating instruction, so that the temperature of the air conditioner indoor unit reaches the target sterilization temperature.

2. The self-cleaning method of a multi-split air conditioner according to claim 1, characterized in that: The step of adjusting the operating frequency of the compressor of the air conditioner outdoor unit further includes: After the compressor runs at the initial frequency for a first running time; determining a first target frequency of the compressor according to a first target temperature; The initial frequency of the compressor is adjusted according to the first target frequency so that the upper limit of the first target temperature is less than a preset temperature, and the preset temperature is less than 0°C.

3. The self-cleaning method of a multi-split air conditioner according to claim 1, characterized in that: The step of adjusting the operating wind speed of the fans of each of the air conditioner indoor units comprises: Presetting a first operating speed of the fan of the indoor unit of the air conditioner; When the air conditioner indoor unit is cooling, obtaining the operating speed of each fan; The operating speed of the fan is adjusted according to the first operating speed, so that the operating speed of the fan is adjusted to the first operating speed.

4. The self-cleaning method of a multi-split air conditioner according to claim 2, characterized in that: The multi-split air conditioner self-cleaning method further comprises the following steps: When the air conditioner indoor unit performs cooling, obtaining the heat exchanger inlet pipe temperature of each air conditioner indoor unit; The opening of the electronic expansion valve of the multi-split air conditioner is adjusted to make the outlet pipe temperature of the heat exchanger equal to the inlet pipe temperature of the heat exchanger.

5. The self-cleaning method of a multi-split air conditioner according to claim 4, characterized in that: The step of adjusting the opening of the electronic expansion valve of the multi-split air conditioner comprises: Preset a second running time for the air conditioner indoor unit to continue cooling; When the outlet pipe temperature of the heat exchanger is less than or equal to the preset temperature for the second operating time, the electronic expansion valve of the air conditioner indoor unit is controlled to close, so that the air conditioner indoor unit enters the air supply mode.

6. The self-cleaning method of a multi-split air conditioner according to claim 5, characterized in that: The step of adjusting the opening of the electronic expansion valve of the multi-split air conditioner also includes: Preset a third operating time for the last indoor unit of the air conditioner to continue cooling and frosting, the third operating time being less than the second operating time; The outlet pipe temperature of the heat exchanger of the air conditioner is obtained. When the outlet pipe temperature of the heat exchanger of the air conditioner is less than or equal to the preset temperature for the third operating time, the opening of the electronic expansion valve is increased and the operating frequency of the compressor is reduced.

7. The self-cleaning method for a multi-split air conditioner according to any one of claims 1 to 6, characterized in that: The step of heating the indoor unit of the air conditioner according to the heating instruction comprises: Presetting a fourth operating time of the compressor of the air conditioner outdoor unit; In response to the heating instruction, the fan of the air conditioner indoor unit is controlled to stop running, the reversing valve of the multi-split air conditioner is controlled to reverse, and the compressor is controlled to increase the operating frequency and continue to run for the fourth operating time, so that the air conditioner indoor unit is defrosted.

8. The self-cleaning method for a multi-split air conditioner according to any one of claims 1 to 6, characterized in that: The steps after defrosting of the air conditioner indoor unit are completed include: Preset a first saturation temperature and a second saturation temperature of the refrigerant of the multi-split air conditioner, the first saturation temperature and the second saturation temperature are condensation temperatures at which the refrigerant is liquefied, and the first saturation temperature is lower than the second saturation temperature; Determining a sterilization operation frequency of the compressor according to the target sterilization temperature; The sterilization operation frequency of the compressor is adjusted according to the target sterilization temperature so that the inlet pipe temperature of the heat exchanger is equal to or greater than the target sterilization temperature, and the target sterilization temperature is greater than the first saturation temperature and less than the second saturation temperature.

9. The self-cleaning method of a multi-split air conditioner according to claim 8, characterized in that: When the air conditioner indoor unit defrosts, the steps further include: Preset a fifth operation time for continuous heating of the air conditioner indoor unit, preset a sixth operation time for the fan of the air conditioner indoor unit to operate, and preset a second operation speed for the fan of the air conditioner indoor unit to operate; acquiring the heat exchanger inlet pipe temperature, and when the heat exchanger inlet pipe temperature is greater than or equal to the target sterilization temperature for the fifth operating time, controlling the fan of the air conditioner indoor unit to operate at the second operating speed; After the fan of the indoor unit of the air conditioner runs at the second operating speed for the sixth operating time, the multi-split air conditioner exits the self-cleaning program.

10. A multi-split air conditioning system, characterized in that: The multi-split air conditioning system comprises an indoor air conditioner and an outdoor air conditioner, and the multi-split air conditioning system also comprises an operation control device, the operation control device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the multi-split air conditioning self-cleaning method as described in any one of claims 1 to 9 when executing the computer program.

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