Variable frequency air conditioner, its control method and storage medium

Abstract

This application discloses a variable frequency air conditioner, its control method, and a storage medium. The indoor heat exchanger of the variable frequency air conditioner includes at least two refrigerant branches connected in parallel, each refrigerant branch equipped with a heat exchange device, and at least one refrigerant branch equipped with a solenoid valve. The method includes: controlling the variable frequency air conditioner to operate in a cooling temperature and humidity control mode; in the cooling temperature and humidity control mode, at least one solenoid valve is activated; based on the ambient temperature value and the target temperature value, it is determined that the current ambient temperature has reached the set condition; based on the ambient humidity value and the target humidity value, it is determined that the current ambient humidity has exceeded the standard; and based on the surface temperature values ​​of the heat exchange devices in operation, it is determined that all surface temperature values ​​are greater than or equal to a first set value. Then, the solenoid valve controlling at least one refrigerant branch in operation is deactivated, thereby reducing the effective evaporation area of ​​the heat exchange devices in the indoor heat exchanger and achieving dehumidification of the variable frequency air conditioner under low load.

Description

Technical Field

[0001] This application relates to the field of air conditioning, and more particularly to an inverter air conditioner, its control method, and a storage medium. Background Technology

[0002] With the advancement of science and technology, air conditioners, as electrical devices for regulating ambient temperature, have become widely used. Traditional fixed-frequency air conditioners, due to their constant compressor speed, require repeated switching of the compressor to reach the set temperature, resulting in high energy consumption. To save energy, variable-frequency air conditioners exist, which use a frequency converter to control the compressor speed and achieve temperature regulation.

[0003] However, during the cooling process, once the ambient temperature reaches the set temperature, the frequency of the inverter in a variable frequency air conditioner will decrease, causing the evaporator temperature to rise. When the evaporator temperature is higher than the air dew point temperature, dehumidification will cease, thus affecting the indoor dehumidification effect and resulting in poor user comfort. Summary of the Invention

[0004] In view of this, embodiments of this application provide a variable frequency air conditioner, its control method, and a storage medium, aiming to effectively improve the dehumidification effect of the variable frequency air conditioner.

[0005] The technical solution of this application embodiment is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a control method for a variable frequency air conditioner, the variable frequency air conditioner comprising: an outdoor heat exchanger, an indoor heat exchanger, and a compressor connected via refrigerant piping; the indoor heat exchanger comprising at least two refrigerant branches connected in parallel, each of the refrigerant branches being provided with a heat exchange device for heat exchange, and at least one refrigerant branch being provided with a solenoid valve for switching on or off the refrigerant; the method comprising:

[0007] The inverter air conditioner is controlled to operate in a cooling temperature and humidity control mode; wherein, in the cooling temperature and humidity control mode, at least one of the solenoid valves is activated;

[0008] Based on the environmental temperature value and the target temperature value, it is determined that the current ambient temperature has reached the set condition; based on the environmental humidity value and the target humidity value, it is determined that the current ambient humidity has exceeded the standard; and based on the surface temperature value of the heat exchange device in operation, it is determined that all surface temperature values ​​are greater than or equal to the first set value. Then, the solenoid valve controlling at least one of the refrigerant branches in operation of the variable frequency air conditioner is shut off.

[0009] In some implementations, the method further includes:

[0010] After the solenoid valve controlling at least one of the refrigerant branches of the variable frequency air conditioner that is in operation is shut off for a set period of time, the surface temperature value of the heat exchange device that is in operation is obtained.

[0011] If all the surface temperature values ​​are greater than or equal to the first set value, then the solenoid valve controlling at least one refrigerant branch that is in operation is shut off; or,

[0012] If at least one of the surface temperature values ​​is less than or equal to the second set value and greater than or equal to the third set value, then the compressor is subjected to frequency reduction control and / or the opening of the electronic expansion valve of the inverter air conditioner is adjusted.

[0013] If at least one of the surface temperature values ​​is less than a third set value, then at least one shut-off solenoid valve will be switched to the open state.

[0014] Wherein, the first setting value is greater than the second setting value, and the second setting value is greater than the third setting value.

[0015] In some implementations, the frequency reduction control of the compressor includes:

[0016] The compressor is frequency-reduced based on a set frequency value; or...

[0017] The compressor is frequency-reduced based on a set percentage of the rated frequency.

[0018] In some implementations, adjusting the opening of the electronic expansion valve of the inverter air conditioner includes:

[0019] Increase the opening of the electronic expansion valve based on the set step size; or,

[0020] The opening of the electronic expansion valve is increased by a set percentage based on the rated step size.

[0021] In some implementations, the method further includes:

[0022] If the ambient temperature is determined to be below the set condition based on the ambient temperature and the target temperature, then at least one shut-off solenoid valve will be switched to the open state, and / or the operating frequency of the compressor of the inverter air conditioner will be increased, and / or the opening of the electronic expansion valve of the inverter air conditioner will be reduced.

[0023] Secondly, embodiments of this application provide a control device for a variable frequency air conditioner. The variable frequency air conditioner includes: an outdoor heat exchanger, an indoor heat exchanger, and a compressor connected via refrigerant piping. The indoor heat exchanger includes at least two refrigerant branches connected in parallel, each refrigerant branch being equipped with a heat exchange device for heat exchange, and at least one refrigerant branch being equipped with a solenoid valve for switching on or off the refrigerant. The control device includes:

[0024] A control module is used to control the inverter air conditioner to operate in a cooling temperature and humidity control mode; wherein, in the cooling temperature and humidity control mode, at least one of the solenoid valves is turned on; and if it is determined that the current ambient temperature has reached the set condition based on the ambient temperature value and the target temperature value, that the current ambient humidity has exceeded the standard based on the ambient humidity value and the target humidity value, and that all surface temperature values ​​are greater than or equal to the first set value based on the surface temperature value of the heat exchange device in operation, then the solenoid valve of at least one refrigerant branch in operation of the inverter air conditioner is turned off.

[0025] In some implementations, the control module is further configured to:

[0026] After the solenoid valve controlling at least one of the refrigerant branches of the variable frequency air conditioner that is in operation is shut off for a set period of time, the surface temperature value of the heat exchange device that is in operation is obtained.

[0027] If all the surface temperature values ​​are greater than or equal to the first set value, then the solenoid valve controlling at least one refrigerant branch that is in operation is shut off; or,

[0028] If at least one of the surface temperature values ​​is less than or equal to the second set value and greater than or equal to the third set value, then the compressor is subjected to frequency reduction control and / or the opening of the electronic expansion valve of the inverter air conditioner is adjusted.

[0029] If at least one of the surface temperature values ​​is less than a third set value, then at least one shut-off solenoid valve will be switched to the open state.

[0030] Wherein, the first setting value is greater than the second setting value, and the second setting value is greater than the third setting value.

[0031] In some implementations, the control module is further configured to:

[0032] If the ambient temperature is determined to be below the set condition based on the ambient temperature and the target temperature, then at least one shut-off solenoid valve will be switched to the open state, and / or the operating frequency of the compressor of the inverter air conditioner will be increased, and / or the opening of the electronic expansion valve of the inverter air conditioner will be reduced.

[0033] Thirdly, this application provides an inverter air conditioner, which includes: an outdoor heat exchanger, an indoor heat exchanger, and a compressor connected via refrigerant piping; the indoor heat exchanger includes at least two refrigerant branches arranged in parallel, each of which is provided with a heat exchange device for heat exchange, and at least one of the refrigerant branches is provided with a solenoid valve for turning on or off the refrigerant; the inverter air conditioner further includes: a processor and a memory for storing a computer program that can run on the processor, wherein the processor, when running the computer program, executes the steps of the method described in the first aspect of this application.

[0034] Fourthly, embodiments of this application provide a storage medium storing a computer program, which, when executed by a processor, implements the steps of the method described in the first aspect of embodiments of this application.

[0035] The technical solution provided in this application embodiment includes an indoor heat exchanger comprising at least two refrigerant branches connected in parallel. Each refrigerant branch is equipped with a heat exchange device for heat exchange, and at least one refrigerant branch is equipped with a solenoid valve for turning on or off the refrigerant. When the inverter air conditioner is running, it is controlled to operate in a cooling temperature and humidity control mode. In this mode, at least one solenoid valve is turned on. If, based on the ambient temperature and target temperature values, it is determined that the current ambient temperature has reached the set condition; based on the ambient humidity and target humidity values, it is determined that the current ambient humidity has exceeded the standard; and based on the surface temperature values ​​of the heat exchange devices in operation, it is determined that all surface temperature values ​​are greater than or equal to a first set value, then the solenoid valve controlling at least one operating refrigerant branch of the inverter air conditioner is turned off. Since the current ambient temperature has reached the set conditions, the inverter air conditioner is in a low-load operation state with a low operating frequency. In this embodiment, by controlling the solenoid valve of at least one refrigerant branch in operation to be shut off, the effective evaporation area of ​​the heat exchange device in the indoor heat exchanger is reduced, which helps to lower the surface temperature (i.e., evaporation temperature) of the heat exchange device that absorbs heat through evaporation. Thus, dehumidification can be achieved by utilizing the condensation phenomenon on the low-temperature surface of the heat exchange device, thereby realizing dehumidification of the inverter air conditioner at low load and effectively improving the dehumidification effect of the inverter air conditioner. Attached Figure Description

[0036] Figure 1 This is a flowchart illustrating the control method of a variable frequency air conditioner according to an embodiment of this application;

[0037] Figure 2 This is a schematic diagram illustrating the principle of the cooling temperature and humidity control mode of an inverter air conditioner according to an embodiment of this application;

[0038] Figure 3This is a schematic diagram illustrating the principle of reducing the evaporator area in an embodiment of this application;

[0039] Figure 4 This is a schematic diagram illustrating the principle of the cooling temperature and humidity control mode of an inverter air conditioner according to another embodiment of this application;

[0040] Figure 5 This is a schematic diagram illustrating the principle of reducing the evaporator area in another embodiment of the inverter air conditioner according to this application;

[0041] Figure 6 This is a schematic flowchart of a control method for a variable frequency air conditioner according to an application embodiment of this application;

[0042] Figure 7 This is a schematic flowchart of a control method for a variable frequency air conditioner, which is another application embodiment of this application.

[0043] Figure 8 This is a schematic diagram of the control device of the inverter air conditioner according to an embodiment of this application;

[0044] Figure 9 This is a schematic diagram of the structure of the inverter air conditioner according to an embodiment of this application.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Refrigerant piping; 11. First refrigerant branch; 12. Second refrigerant branch; 1n. Nth refrigerant branch;

[0047] 2. Indoor heat exchanger;

[0048] 3. Outdoor heat exchanger; 4. Compressor; 5. Four-way valve; 6. Liquid receiver;

[0049] 7. Electronic expansion valve; 81. First shut-off valve; 82. Second shut-off valve; 9. Solenoid valve;

[0050] 800. Control device for air conditioner; 801. Control module;

[0051] 900. Inverter air conditioner; 901. Processor; 902. Memory;

[0052] 903. User interface; 904. Bus system. Detailed Implementation

[0053] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0055] This application provides a control method for an inverter air conditioner, which is used to regulate the temperature, humidity, etc. of the environment. The inverter air conditioner can be a cooling-only air conditioner or a cooling and heating air conditioner, and can take the form of a wall-mounted air conditioner, floor-standing air conditioner, window air conditioner, or ceiling-mounted air conditioner, etc. This application does not specifically limit the type of inverter air conditioner.

[0056] In this embodiment of the application, the variable frequency air conditioner includes: an outdoor heat exchanger, an indoor heat exchanger, and a compressor connected by refrigerant pipelines; the indoor heat exchanger includes at least two refrigerant branches arranged in parallel, each of the refrigerant branches is provided with a heat exchange device for heat exchange, and at least one refrigerant branch is provided with a solenoid valve for conducting or stopping the refrigerant.

[0057] It is understandable that at least one refrigerant branch of the indoor heat exchanger can be controlled by a solenoid valve to control whether the refrigerant is flowing, thereby enabling the adjustment of the actual heat exchange area of ​​the heat exchange device of the indoor heat exchanger.

[0058] It should be noted that for dual-purpose air conditioners (also known as heat pump air conditioners), the functions of the evaporator and condenser can be interchanged based on the reversing function of the four-way valve.

[0059] For example, when an air conditioner is cooling, the refrigerant (also known as cooling fluid) in the refrigerant pipeline flows sequentially through the compressor's discharge port, four-way valve, outdoor heat exchanger, electronic expansion valve, indoor heat exchanger, four-way valve, receiver-of-flow tank, and compressor's suction port to form a cycle. Exemplarily, the low-temperature, low-pressure refrigerant from the indoor heat exchanger enters the receiver-of-flow tank through the four-way valve, where it separates into liquid. The gaseous refrigerant is then drawn into the compressor and compressed into a high-temperature, high-pressure gas, which is then discharged. This gas enters the outdoor heat exchanger through the four-way valve, releasing heat and condensing into liquid refrigerant. The liquid refrigerant is then depressurized by the electronic expansion valve, becoming a low-temperature, low-pressure two-phase fluid. It then enters the indoor heat exchanger to evaporate and absorb heat (at this time, the indoor air is cooled), and once again enters the cycle through the four-way valve and receiver-of-flow tank.

[0060] For example, when the air conditioner is in heating mode, the refrigerant in the refrigerant pipeline sequentially passes through the compressor's discharge port, four-way valve, indoor heat exchanger, electronic expansion valve, outdoor heat exchanger, four-way valve, receiver-of-liquid tank, and compressor's suction port to form a cycle. For example, the low-temperature, low-pressure refrigerant from the outdoor heat exchanger enters the receiver-of-liquid tank through the four-way valve, where the liquid is separated. The gaseous refrigerant is then drawn into the compressor and compressed into a high-temperature, high-pressure gas, which is then discharged. The gas enters the indoor heat exchanger through the four-way valve to release heat (at this time, the indoor air is heated), and condenses into liquid refrigerant. The liquid refrigerant is depressurized by the electronic expansion valve, becoming a low-temperature, low-pressure two-phase fluid, which enters the outdoor heat exchanger to evaporate and absorb heat, and then passes through the four-way valve and receiver-of-liquid tank again to enter the next cycle.

[0061] It is understood that the variable frequency air conditioner in the embodiments of this application can be a dual-purpose air conditioner for both cooling and heating.

[0062] like Figure 1 As shown, the control method for a variable frequency air conditioner according to an embodiment of this application includes:

[0063] Step 101: Control the inverter air conditioner to operate in the cooling temperature and humidity control mode; wherein, in the cooling temperature and humidity control mode, at least one of the solenoid valves is turned on.

[0064] Understandably, when a variable frequency air conditioner is operating in cooling temperature and humidity control mode, it needs to balance temperature and humidity. For example, at the beginning of operation, in order to achieve rapid cooling, all solenoid valves can be turned on, so that each heat exchange device of the indoor heat exchanger acts as an evaporator to absorb heat through evaporation.

[0065] Step 102: Based on the environmental temperature value and the target temperature value, it is determined that the current ambient temperature has reached the set condition; based on the environmental humidity value and the target humidity value, it is determined that the current ambient humidity has exceeded the standard; and based on the surface temperature value of the heat exchange device in operation, it is determined that all surface temperature values ​​are greater than or equal to the first set value. Then, the solenoid valve controlling at least one of the refrigerant branches in operation of the variable frequency air conditioner is shut off.

[0066] Here, a heat exchange device in working condition refers to a heat exchange device through which refrigerant passes, and a refrigerant branch in working condition refers to a refrigerant branch where the solenoid valve is in the conducting state.

[0067] Since the operating frequency of the compressor in a variable frequency air conditioner can be adjusted, the variable frequency air conditioner determines that the ambient temperature has reached the target temperature value based on the acquired ambient temperature detection value, and then controls the compressor to run at a low frequency. At this time, the evaporation temperature of each heat exchange device will rise, which may cause the variable frequency air conditioner to fail to dehumidify under low load.

[0068] In this embodiment, the inverter air conditioner can make judgments based on the acquired detection parameters and intelligently control the state of the solenoid valve, so that the inverter air conditioner can still meet the dehumidification requirements when running under low load.

[0069] For example, if the inverter air conditioner determines that the current ambient temperature has reached the set condition based on the ambient temperature detection value and the target temperature value, determines that the current ambient humidity has exceeded the standard based on the ambient humidity value and the target humidity value, and determines that all surface temperature values ​​are greater than or equal to the first set value based on the surface temperature value of the heat exchange device in operation, then the solenoid valve controlling at least one refrigerant branch in operation of the inverter air conditioner is shut off.

[0070] Here, the target temperature value can be either the default cooling target temperature value or a user-defined cooling target temperature value. For example, if the difference between the detected ambient temperature value and the target temperature value is less than or equal to a set temperature difference threshold (e.g., 1°C), it can be determined that the current ambient temperature has reached the set condition. It is understood that the indoor unit of an inverter air conditioner can be equipped with a temperature sensor to detect the indoor ambient temperature; for example, this temperature sensor can detect the indoor ambient temperature every 200ms (milliseconds).

[0071] Here, the target humidity value can be a default target humidity value or a user-defined target humidity value. For example, if the detected ambient humidity value is greater than the target humidity value, it can be determined that the current ambient humidity has exceeded the standard. It is understood that the indoor unit of the inverter air conditioner can be equipped with a humidity sensor to detect the indoor ambient humidity. For example, the humidity sensor can detect the indoor ambient humidity every 500ms (milliseconds).

[0072] Here, the first set value can be determined based on the dew point temperature. For example, the first set value = TL - a, where TL is the dew point temperature. For instance, the range of TL can be 8–10℃, and the range of a is 1–3℃. It is understood that each heat exchanger in the indoor heat exchanger can be equipped with a temperature sensor to detect the surface temperature. The inverter air conditioner determines whether the minimum surface temperature value is greater than or equal to the first set value based on the surface temperature values ​​generated by the temperature sensors of the heat exchangers in operation. That is, whether the surface temperature values ​​of all operating heat exchangers are greater than or equal to the first set value. If so, it indicates that the evaporation temperature of the indoor heat exchanger is too high, and dehumidification is not possible.

[0073] In this embodiment, when the inverter air conditioner is operating under low load and there is a need for dehumidification, if the surface temperature of the heat exchange device is determined to be too high, the solenoid valve controlling at least one refrigerant branch in operation is shut off. This reduces the effective evaporation area of ​​the heat exchange device in the indoor heat exchanger, which helps to lower the surface temperature (i.e., evaporation temperature) of the heat exchange device that absorbs heat through evaporation. Dehumidification can then be achieved by utilizing the condensation phenomenon on the low-temperature surface of the heat exchange device, thus realizing dehumidification of the inverter air conditioner under low load and effectively improving the dehumidification effect of the inverter air conditioner.

[0074] In some embodiments, the method further includes:

[0075] After the solenoid valve controlling at least one of the refrigerant branches of the variable frequency air conditioner that is in operation is shut off for a set period of time, the surface temperature value of the heat exchange device that is in operation is obtained.

[0076] If all the surface temperature values ​​are greater than or equal to the first set value, then the solenoid valve controlling at least one refrigerant branch that is in operation is shut off; or,

[0077] If at least one of the surface temperature values ​​is less than or equal to the second set value and greater than or equal to the third set value, then the compressor is subjected to frequency reduction control and / or the opening of the electronic expansion valve of the inverter air conditioner is adjusted.

[0078] If at least one of the surface temperature values ​​is less than a third set value, then at least one shut-off solenoid valve will be switched to the open state.

[0079] Wherein, the first setting value is greater than the second setting value, and the second setting value is greater than the third setting value.

[0080] It should be noted that the aforementioned setting duration, second setting value, and third setting value can be reasonably set according to requirements. The setting duration meets the minimum time required for the solenoid valve to stabilize after adjustment, while the second and third setting values ​​serve as the basis for determining whether the heat exchange device has a risk of icing. For example, the setting duration is 10 minutes, the second setting value is 5°C, and the third setting value is 1°C.

[0081] Understandably, the air conditioner can periodically acquire and judge detection parameters, and control the state of the solenoid valves based on the judgment results to better balance the impact of ambient temperature and humidity on user comfort. Specifically, in the cooling temperature and humidity control mode, the air conditioner can acquire the surface temperature value of the heat exchanger in operation for a set time period and compare it with the aforementioned first, second, and third set values. Based on the comparison results, adjustments are made. For example, if all surface temperature values ​​are greater than the first set value, at least one solenoid valve in the refrigerant branch in operation is shut off; if at least one surface temperature value is less than or equal to the second set value and greater than or equal to the third set value, the compressor frequency is reduced and / or the opening of the electronic expansion valve of the inverter air conditioner is adjusted; if at least one surface temperature value is less than the third set value, at least one shut-off solenoid valve is switched to the open state, and this cycle continues until the cooling temperature and humidity control mode is exited.

[0082] Understandably, if all newly acquired surface temperature values ​​are greater than or equal to the first set value, it indicates that the dehumidification effect of the indoor heat exchanger still needs improvement. In this case, at least one solenoid valve in the remaining refrigerant branch can be shut off, thereby further reducing the actual evaporation area and allowing the surface of the working evaporator to dehumidify based on condensation. For example, the solenoid valves of the remaining refrigerant branches can be shut off one by one based on a periodic judgment process.

[0083] Understandably, if at least one of the newly acquired surface temperature values ​​is less than or equal to the second set value and greater than or equal to the third set value, it indicates that the heat exchange device is at risk of icing. This can be controlled by reducing the frequency of the compressor and / or adjusting the opening of the electronic expansion valve of the inverter air conditioner. Here, reducing the frequency of the compressor and / or increasing the opening of the electronic expansion valve can increase the evaporation temperature of the heat exchange device, which helps to effectively prevent the surface of the heat exchange device from icing due to excessively low temperature.

[0084] Understandably, if at least one of the newly acquired surface temperature values ​​is less than the third set value, it indicates that the heat exchange device is at risk of icing, and at least one of the shut-off solenoid valves needs to be switched to the open state to achieve rapid temperature regulation of the indoor heat exchanger. For example, all shut-off solenoid valves can be reset to the open state, or they can be reset one by one to the open state based on a periodic judgment process.

[0085] For example, the frequency reduction control of the compressor includes:

[0086] The compressor is frequency-reduced based on a set frequency value; or...

[0087] The compressor is frequency-reduced based on a set percentage of the rated frequency.

[0088] In one example, if at least one of the newly acquired surface temperature values ​​is less than or equal to a second set value and greater than or equal to a third set value, the compressor can be frequency-reduced based on a set frequency value (e.g., 5 Hz) or based on a set percentage (e.g., 10%) of the rated frequency (e.g., 60 Hz). This fine-tuning of the compressor's frequency reduction improves the problem of excessively low indoor heat exchanger temperatures.

[0089] For example, adjusting the opening of the electronic expansion valve of the inverter air conditioner includes:

[0090] Increase the opening of the electronic expansion valve based on the set step size; or,

[0091] The opening of the electronic expansion valve is increased by a set percentage based on the rated step size.

[0092] In one example, if at least one of the newly acquired surface temperature values ​​is less than or equal to a second set value and greater than or equal to a third set value, the opening of the electronic expansion valve can be increased based on a set step size; or the opening of the electronic expansion valve can be increased based on a set percentage of the rated step size. The set step size or set percentage can be reasonably determined based on experimental data; for example, the set step size could be 20 steps; or the rated step size could be 280 steps, and the set percentage could be 10%. In this way, the evaporation temperature and evaporation pressure of the indoor heat exchanger can be gradually increased, thereby improving the phenomenon of excessively low indoor heat exchanger temperature.

[0093] In some embodiments, the method further includes:

[0094] If the ambient temperature is determined to be below the set condition based on the ambient temperature and the target temperature, then at least one shut-off solenoid valve will be switched to the open state, and / or the operating frequency of the compressor of the inverter air conditioner will be increased, and / or the opening of the electronic expansion valve of the inverter air conditioner will be reduced.

[0095] For example, the inverter air conditioner can periodically compare the acquired ambient temperature value with the target temperature value. If the difference between the ambient temperature value and the target temperature value is greater than a set temperature difference threshold (e.g., 1°C), it can be determined that the current ambient temperature has not reached the set condition. At least one shut-off solenoid valve can then be switched to the open state, and / or the operating frequency of the inverter air conditioner's compressor can be increased, and / or the opening of the inverter air conditioner's electronic expansion valve can be decreased. For example, all shut-off solenoid valves can be reset to the open state, or they can be reset one by one based on a periodic judgment process. It is understood that as the shut-off solenoid valves are reset to the open state, the actual evaporation area of ​​the indoor heat exchanger increases, thereby better meeting the indoor cooling demand and achieving stable control of the ambient temperature.

[0096] It should be noted that the interval between periodically comparing the ambient temperature value and the target temperature value is shorter than the set interval corresponding to the aforementioned comparison surface temperature value. That is, the inverter air conditioner prioritizes meeting the control requirements for the stability of the indoor ambient temperature, and on this basis, meets the dehumidification requirements based on the control of the state of the solenoid valve.

[0097] For example, such as Figures 2 to 5As shown, the inverter air conditioner includes an indoor unit and an outdoor unit. The indoor unit includes an indoor heat exchanger 2, and the outdoor unit includes an outdoor heat exchanger 3 and a compressor 4. The indoor heat exchanger 2, the outdoor heat exchanger 3, and the compressor 4 are connected via a refrigerant pipeline 1. A four-way valve 5 and a liquid receiver 6 are also installed on the refrigerant pipeline 1. The four-way valve 5, based on its reversing function, allows the indoor heat exchanger 2 and the outdoor heat exchanger 3 of the inverter air conditioner to interchange functions, thereby enabling the switching between cooling and heating modes. For example, the inverter air conditioner can extract heat from the low-temperature outdoor air in winter to heat the indoor air; or it can remove heat from the indoor air in summer and transfer it to the outdoor air. The liquid receiver 6 is located at the suction port of the compressor 4 and can separate the refrigerant on the refrigerant pipeline 1 into gas and liquid phases, thus allowing only the gaseous refrigerant to enter the suction port of the compressor 4.

[0098] For example, such as Figure 2 and Figure 3 As shown, the indoor heat exchanger 2 includes two refrigerant branches connected in parallel, namely the first refrigerant branch 11 and the second refrigerant branch 12. The first refrigerant branch 11 is equipped with a solenoid valve 9 and a heat exchange device 1, while the second refrigerant branch 12 is equipped with a heat exchange device 2. An electronic expansion valve 7 is installed on the refrigerant pipeline 1 between the indoor heat exchanger 2 and the outdoor heat exchanger 3.

[0099] It is understood that in other embodiments, the number of heat exchange devices in the indoor heat exchanger 2 may be more than two, for example, such as Figure 4 and Figure 5 As shown, the indoor heat exchanger 2 includes n refrigerant branches connected in parallel, namely the first refrigerant branch 11, the second refrigerant branch 12, ..., the nth refrigerant branch 1n, where n is a natural number greater than 2. Each refrigerant branch is equipped with a solenoid valve 9 and a heat exchange device; that is, each refrigerant branch has a corresponding solenoid valve 9. The indoor heat exchanger 2 includes heat exchange device 1, heat exchange device 2, ..., heat exchange device n. An electronic expansion valve 7 is installed on the refrigerant pipeline 1 between the indoor heat exchanger 2 and the outdoor heat exchanger 3.

[0100] For example, to facilitate the installation of the indoor and outdoor units, a shut-off valve is also installed on the refrigerant pipeline between the indoor and outdoor units. For example, such as... Figures 2 to 5 As shown, a first shut-off valve 81 and a second shut-off valve 82 are installed on the refrigerant pipeline 1 between the outdoor unit and the indoor unit. After the inverter air conditioner is installed in place, both the first shut-off valve 81 and the second shut-off valve 82 are in the normally open state.

[0101] like Figure 2As shown, when the inverter air conditioner is operating in cooling temperature and humidity control mode, the solenoid valve 9 is activated, meaning both the first refrigerant branch 11 and the second refrigerant branch 12 are activated. The refrigerant on refrigerant line 1 sequentially passes through the exhaust port of compressor 4, four-way valve 5, outdoor heat exchanger 3, and electronic expansion valve 7 before entering the indoor heat exchanger 2. It evaporates and absorbs heat at both heat exchangers 1 and 2. The refrigerant after heat exchange in the indoor heat exchanger 2 circulates through four-way valve 5, liquid receiver 6, and the suction port of compressor 4. For example, the low-temperature, low-pressure refrigerant from the indoor heat exchanger 2 enters the liquid receiver 6 through four-way valve 5. After the liquid is separated, the gaseous refrigerant is drawn into the compressor 4 and compressed into a high-temperature, high-pressure gas, which is then discharged. The gas enters the outdoor heat exchanger 3 through four-way valve 5 to release heat and condense into liquid refrigerant. After the liquid refrigerant is depressurized by the electronic expansion valve 7, it becomes a low-temperature, low-pressure two-phase fluid, which then enters heat exchanger 1 and heat exchanger 2 for evaporation and heat absorption (at this time, the indoor air is cooled), and then enters the next cycle again through the four-way valve 5 and the liquid receiver 6. It can be understood that when operating in the cooling temperature and humidity control mode, both heat exchanger 1 and heat exchanger 2 can utilize the refrigerant for evaporation and heat absorption, which can accelerate the cooling effect.

[0102] When an inverter air conditioner is operating at a low load, meaning the current ambient temperature has reached the set condition, and if dehumidification is required (i.e., the current ambient humidity is determined to be excessive based on the ambient humidity value and the target humidity value), and the surface temperature of the heat exchanger in operation is too high (i.e., the minimum surface temperature value is greater than or equal to the first set value), then the solenoid valve controlling at least one refrigerant branch is shut off. For example... Figure 3 As shown, because solenoid valve 9 is shut off, that is, the first refrigerant branch 11 is not conducting (e.g. Figure 3 As shown by the dotted line in the diagram, heat exchange device 1 cannot use refrigerant for evaporation and heat absorption. At this time, the effective evaporation area of ​​the heat exchange device of indoor heat exchanger 2 is reduced, which helps to lower the surface temperature (i.e., evaporation temperature) of the heat exchange device that is evaporating and absorbing heat. Thus, dehumidification can be achieved by utilizing the condensation phenomenon on the low-temperature surface of the heat exchange device, thereby realizing dehumidification of the inverter air conditioner under low load and effectively improving the dehumidification effect of the inverter air conditioner.

[0103] like Figure 4As shown, when the inverter air conditioner is running in cooling temperature and humidity control mode, the solenoid valves 9 of each refrigerant branch are all open, that is, the first refrigerant branch 11, the second refrigerant branch 12, ... the nth refrigerant branch 1n are all open. The refrigerant on the refrigerant pipe 1 passes sequentially through the exhaust port of the compressor 4, the four-way valve 5, the outdoor heat exchanger 3, and the electronic expansion valve 7 before entering the indoor heat exchanger 2. It evaporates and absorbs heat at the heat exchanger 1, heat exchanger 2, ... heat exchanger n. The refrigerant after heat exchange in the indoor heat exchanger 2 circulates through the four-way valve 5, the liquid receiver 6, and the suction port of the compressor 4. For example, the low-temperature, low-pressure refrigerant from the indoor heat exchanger 2 enters the liquid receiver 6 through the four-way valve 5. After the liquid is separated, the gaseous refrigerant is drawn into the compressor 4 and compressed into a high-temperature, high-pressure gas, which is then discharged. The gas enters the outdoor heat exchanger 3 through the four-way valve 5 to release heat and condense into liquid refrigerant. After the liquid refrigerant is depressurized by the electronic expansion valve 7, it becomes a low-temperature, low-pressure two-phase fluid and enters heat exchanger 1, heat exchanger 2, ... heat exchanger n for evaporation and heat absorption (at this time, the indoor air is cooled). It then enters the next cycle again through the four-way valve 5 and the liquid receiver 6. It can be understood that when operating in the cooling temperature and humidity control mode, heat exchanger 1, heat exchanger 2, ... heat exchanger n can all utilize the refrigerant for evaporation and heat absorption, which can accelerate the cooling effect.

[0104] When an inverter air conditioner is operating at a low load, meaning the current ambient temperature has reached the set condition, and if dehumidification is required (i.e., the current ambient humidity is determined to be excessive based on the ambient humidity value and the target humidity value), and the surface temperature of at least one heat exchanger is too high (i.e., at least one surface temperature value is greater than or equal to the first set value), then the solenoid valve controlling at least one refrigerant branch is shut off. For example... Figure 5 As shown, the solenoid valve 9 that controls the first refrigerant branch 11 is shut off, meaning the first refrigerant branch 11 is not open (e.g., Figure 5 As shown by the dotted line in the diagram, heat exchange device 1 cannot use refrigerant for evaporation and heat absorption. At this time, the effective evaporation area of ​​the heat exchange device of indoor heat exchanger 2 is reduced, which helps to lower the surface temperature (i.e., evaporation temperature) of the heat exchange device that is evaporating and absorbing heat. Thus, dehumidification can be achieved by utilizing the condensation phenomenon on the low-temperature surface of the heat exchange device, thereby realizing dehumidification of the inverter air conditioner under low load and effectively improving the dehumidification effect of the inverter air conditioner.

[0105] The control method of variable frequency air conditioners will be illustrated below with examples of application implementation.

[0106] Combination Figure 2 , Figure 3 and Figure 6 As shown, in one application embodiment, the control method for a variable frequency air conditioner includes:

[0107] Step 601: The inverter air conditioner starts in the cooling temperature and humidity control mode.

[0108] It is understood that the cooling temperature and humidity control mode in this application embodiment refers to the inverter air conditioner supporting dehumidification needs when operating under low load conditions, thereby meeting the control needs of indoor temperature and humidity and improving user comfort.

[0109] For example, an inverter air conditioner can operate in cooling temperature and humidity control mode based on commands sent by a remote control or input commands such as those pressed on a control panel. It is understood that the user can also set at least one of the aforementioned target temperature value, target humidity value, temperature difference threshold, first set value, second set value, and third set value.

[0110] Step 602: Run the cooling temperature and humidity control mode.

[0111] Here, in the cooling temperature and humidity control mode, such as Figure 2 As shown, the solenoid valve 9 on the first refrigerant branch 11 is turned on, so that the heat exchange device 1 and the heat exchange device 2 of the indoor heat exchanger both act as evaporators to absorb heat through evaporation, thereby meeting the requirement for rapid cooling.

[0112] Step 603: Obtain the detection parameters, which include: ambient temperature value Ta, heat exchanger surface temperature value Tb, and ambient humidity value Φ.

[0113] Here, the indoor unit of the inverter air conditioner can be equipped with a temperature sensor to detect the indoor ambient temperature and a humidity sensor to detect the indoor ambient humidity. The heat exchange device 2 can be equipped with a temperature sensor to detect the surface temperature. In this way, the ambient temperature value Ta, the surface temperature value Tb of the heat exchange device and the ambient humidity value Φ can be obtained.

[0114] Step 604: Determine whether Ta-Ts≤1 and Φ≥Φs. If yes, proceed to step 605; otherwise, return to step 603.

[0115] Here, Ts is the target temperature value and Φs is the target humidity value. If the inverter air conditioner determines that Ta-Ts≤1 and Φ≥Φs, it determines that the current indoor ambient temperature has reached the set conditions and the current indoor ambient humidity has exceeded the standard, and then executes step 605; otherwise, it returns to step 603.

[0116] Step 605: Determine whether Tb≥TL-a. If yes, proceed to step 606; otherwise, return to step 603.

[0117] Here, the inverter air conditioner compares the surface temperature value Tb of the heat exchange device 2 with TL-a (i.e., the first set value). If Tb≥TL-a, it indicates that the evaporation temperature of the indoor heat exchanger is too high and dehumidification cannot be performed. Step 606 is executed. Otherwise, the process returns to step 603.

[0118] Step 606: The control solenoid valve is shut off.

[0119] Here, the electromagnetic valve 9 on the first refrigerant branch 11 of the variable-frequency air conditioner is cut off. At this time, the heat exchange device 1 cannot perform evaporation heat absorption, reducing the effective evaporation area of the indoor heat exchanger 2, which is conducive to reducing the surface temperature (i.e., evaporation temperature) of the indoor heat exchanger 2, and thus the dehumidification can be achieved by using the condensation phenomenon on the low-temperature surface of the heat exchange device.

[0120] Step 607: Compare Tb with Tp1 and Tp2; if Tb > Tp1, return to step 603; if Tp2 ≤ Tb ≤ Tp1, execute step 608; if Tb < Tp2, execute step 609.

[0121] Here, Tp1 is the aforementioned second set value, and TP2 is the aforementioned third set value. After the electromagnetic valve 9 of the variable-frequency air conditioner is cut off, the surface temperature value Tb of the obtained heat exchange device 2 is compared with the second set value Tp1 and the third set value Tp2 based on the set interval duration (e.g., 10 minutes). Exemplarily, Tp1 is 5°C and Tp2 is 1°C. If the surface temperature value Tb > the second set value Tp1, it indicates that there is no ice formation risk for the indoor heat exchanger 2, and return to step 603; if the third set value Tp2 ≤ the surface temperature value Tb ≤ the second set value Tp1, it indicates that there is an ice formation risk for the indoor heat exchanger 2, and execute step 608; if the surface temperature value Tb < the third set value Tp2, it indicates that the surface temperature of the indoor heat exchanger 2 is too low, and execute step 609.

[0122] Step 608: Perform frequency reduction control on the compressor and / or adjust the opening degree of the electronic expansion valve of the variable-frequency air conditioner, and return to step 603.

[0123] Here, the variable-frequency air conditioner can perform frequency reduction control on the compressor and / or adjust the opening degree of the electronic expansion valve of the variable-frequency air conditioner to increase the evaporation temperature of the indoor heat exchanger 2, and return to step 603.

[0124] Step 609: Control the electromagnetic valve to be turned on, and return to step 602.

[0125] Here, the variable-frequency air conditioner can control the electromagnetic valve 9 on the first refrigerant branch 11 to be turned on, and return to step 602.

[0126] Combined Figure 4 、 Figure 5 and Figure 7 As shown, in an application embodiment, the control method of the variable-frequency air conditioner includes:

[0127] Step 701: The variable-frequency air conditioner starts in the refrigeration temperature and humidity control mode.

[0128] It is understood that the cooling temperature and humidity control mode in this application embodiment refers to the inverter air conditioner supporting dehumidification needs when operating under low load conditions, thereby meeting the control needs of indoor temperature and humidity and improving user comfort.

[0129] For example, an inverter air conditioner can operate in cooling temperature and humidity control mode based on commands sent by a remote control or input commands such as those pressed on a control panel. It is understood that the user can also set at least one of the aforementioned target temperature value, target humidity value, temperature difference threshold, first set value, second set value, and third set value.

[0130] Step 702: Run the cooling temperature and humidity control mode.

[0131] Here, in the cooling temperature and humidity control mode, such as Figure 4 As shown, the solenoid valves 9 of each refrigerant branch are all turned on, so that the heat exchange devices 1, 2, ... n of the indoor heat exchanger all act as evaporators to absorb heat through evaporation, thereby meeting the requirements for rapid cooling.

[0132] Step 703: Obtain the detection parameters, which include: ambient temperature value Ta, heat exchanger surface temperature value Tb, and ambient humidity value Φ.

[0133] Here, the indoor unit of the inverter air conditioner can be equipped with a temperature sensor to detect the indoor ambient temperature and a humidity sensor to detect the indoor ambient humidity. Temperature sensors to detect the surface temperature can be installed on heat exchange device 1, heat exchange device 2, ... heat exchange device n. In this way, the ambient temperature value Ta, the surface temperature value Tb of each heat exchange device and the ambient humidity value Φ can be obtained. Among them, the surface temperature value Tb of each heat exchange device can be represented as Tb1, Tb2, ... Tbn, which correspond to heat exchange device 1, heat exchange device 2, ... heat exchange device n respectively.

[0134] Step 704: Determine whether Ta-Ts≤1 and Φ≥Φs. If yes, proceed to step 705; otherwise, return to step 703.

[0135] Here, Ts is the target temperature value and Φs is the target humidity value. If the inverter air conditioner determines that Ta-Ts≤1 and Φ≥Φs, it determines that the current indoor ambient temperature has reached the set conditions and the current indoor ambient humidity has exceeded the standard, and then executes step 705; otherwise, it returns to step 703.

[0136] Step 705: Determine if the minimum surface temperature value is ≥ TL-a. If yes, proceed to step 706; otherwise, return to step 703.

[0137] Here, the variable-frequency air conditioner compares the surface temperature value Tb of each heat exchange device with TL-a (i.e., the first set value). If Min(Tb1, Tb2, …… Tbn) ≥ TL-a, that is, the minimum surface temperature value ≥ TL-a, it indicates that the evaporation temperature of the indoor heat exchanger is too high and dehumidification cannot be performed. Step 706 is executed. Otherwise, return to Step 703.

[0138] Step 706, control a solenoid valve to be cut off.

[0139] Here, the variable-frequency air conditioner controls the solenoid valve 9 on the first refrigerant branch 11 to be cut off. At this time, the heat exchange device 1 cannot perform evaporation heat absorption, reducing the effective evaporation area of the indoor heat exchanger 2, which is beneficial to reducing the surface temperature (i.e., evaporation temperature) of the indoor heat exchanger 2. Thus, dehumidification can be achieved by using the condensation phenomenon on the low-temperature surface of the heat exchange device.

[0140] Step 707, compare the surface temperature values of the remaining heat exchange devices with TL-a, Tp1, and Tp2; if the minimum surface temperature value ≥ TL-a, then execute Step 708; if Tp1 < each surface temperature value < TL-a, then execute Step 709; if Tp2 ≤ the minimum surface temperature value ≤ Tp1, then execute Step 710; if the minimum surface temperature value < Tp2, then execute Step 711.

[0141] Here, Tp1 is the aforementioned second set value, and TP2 is the aforementioned third set value. After the solenoid valve 9 can be cut off, the variable-frequency air conditioner compares the surface temperature values of the remaining heat exchange devices obtained with the second set value Tp1 and the third set value Tp2 based on the set interval duration (e.g., 10 minutes). Exemplarily, Tp1 is 5°C and Tp2 is 1°C. If the minimum surface temperature value ≥ TL-a, it indicates that the evaporation temperature of the indoor heat exchanger is still too high, and Step 708 is executed; if the second set value Tp1 < each surface temperature value < TL-a, it indicates that the evaporation temperature of the indoor heat exchanger is in a reasonable range, and Step 709 is executed; if the third set value Tp2 ≤ the minimum surface temperature value ≤ the second set value Tp1, it indicates that there is a risk of icing on the indoor heat exchanger 2, and Step 710 is executed; if the minimum surface temperature value < Tp2, it indicates that the surface temperature of the indoor heat exchanger 2 is too low, and Step 711 is executed.

[0142] Step 708, control the next solenoid valve to be cut off.

[0143] For example, if Min(Tb2, Tb3, ..., Tbn) ≥ TL-a, meaning the remaining minimum surface temperature value is ≥ TL-a, it indicates that the evaporation temperature of the indoor heat exchanger is too high. The solenoid valves can be shut off, for example, the solenoid valve 9 controlling the second refrigerant branch 12 can be shut off, and the process returns to step 703. It is understood that if the phenomenon of excessively high evaporation temperature of the indoor heat exchanger persists, the solenoid valves can be shut off one by one through periodic checks.

[0144] Step 709: Maintain the solenoid valve state unchanged and return to step 703.

[0145] Step 710: Reduce the frequency of the compressor and / or adjust the opening of the electronic expansion valve of the inverter air conditioner, and return to step 703.

[0146] Here, the inverter air conditioner can increase the evaporation temperature of the indoor heat exchanger 2 by controlling the compressor to reduce its frequency and / or adjusting the opening of the electronic expansion valve of the inverter air conditioner, and then return to step 703.

[0147] Step 711: The control solenoid valve is turned on, and the process returns to step 702.

[0148] Here, the inverter air conditioner can reset each of the shut-off solenoid valves to the open state and return to step 702.

[0149] In order to implement the method of the embodiments of this application, the embodiments of this application also provide a control device for a variable frequency air conditioner. The control device for the variable frequency air conditioner corresponds to the control method of the variable frequency air conditioner described above. The steps in the control method embodiments of the variable frequency air conditioner described above are also fully applicable to the control device embodiments of this variable frequency air conditioner.

[0150] like Figure 8 As shown, the control device of the inverter air conditioner includes: a control module 801, used to control the inverter air conditioner to operate in a cooling temperature and humidity control mode; wherein, in the cooling temperature and humidity control mode, all the solenoid valves are turned on; and based on the ambient temperature value and the target temperature value, it is determined that the current ambient temperature has reached the set condition; based on the ambient humidity value and the target humidity value, it is determined that the current ambient humidity has exceeded the standard; and based on the surface temperature value of the heat exchange device in operation, it is determined that all surface temperature values ​​are greater than or equal to the first set value, then the solenoid valve of at least one refrigerant branch in operation of the inverter air conditioner is turned off.

[0151] In some embodiments, the control module 801 is further configured to:

[0152] After the solenoid valve controlling at least one of the refrigerant branches of the variable frequency air conditioner that is in operation is shut off for a set period of time, the surface temperature value of the heat exchange device that is in operation is obtained.

[0153] If all the surface temperature values ​​are greater than or equal to the first set value, then the solenoid valve controlling at least one refrigerant branch that is in operation is shut off; or,

[0154] If at least one of the surface temperature values ​​is less than or equal to the second set value and greater than or equal to the third set value, then the compressor is subjected to frequency reduction control and / or the opening of the electronic expansion valve of the inverter air conditioner is adjusted.

[0155] If at least one of the surface temperature values ​​is less than a third set value, then at least one shut-off solenoid valve will be switched to the open state.

[0156] Wherein, the first setting value is greater than the second setting value, and the second setting value is greater than the third setting value.

[0157] In some embodiments, the control module 801 performs frequency reduction control on the compressor, including:

[0158] The compressor is frequency-reduced based on a set frequency value; or...

[0159] The compressor is frequency-reduced based on a set percentage of the rated frequency.

[0160] In some embodiments, the control module 801 adjusts the opening of the electronic expansion valve of the inverter air conditioner, including:

[0161] Increase the opening of the electronic expansion valve based on the set step size; or,

[0162] The opening of the electronic expansion valve is increased by a set percentage based on the rated step size.

[0163] In some embodiments, the control module 801 is further configured to:

[0164] If the ambient temperature is determined to be below the set condition based on the ambient temperature and the target temperature, then at least one shut-off solenoid valve will be switched to the open state, and / or the operating frequency of the compressor of the inverter air conditioner will be increased, and / or the opening of the electronic expansion valve of the inverter air conditioner will be reduced.

[0165] In practical applications, the control module 801 can be implemented by the processor of the inverter air conditioner. Of course, the processor needs to run the computer program in memory to realize its function.

[0166] It should be noted that the control device for the inverter air conditioner provided in the above embodiments is only illustrated by the division of the above-described program modules when controlling the inverter air conditioner. In actual applications, the above processing can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program modules to complete all or part of the processing described above. In addition, the control device for the inverter air conditioner provided in the above embodiments and the control method embodiments for the inverter air conditioner belong to the same concept, and the specific implementation process can be found in the method embodiments, which will not be repeated here.

[0167] Based on the hardware implementation of the above program modules, and in order to implement the method of the embodiments of this application, the embodiments of this application also provide a variable frequency air conditioner. Figure 9 This is only an exemplary structure of the inverter air conditioner, not the entire structure; it can be implemented as needed. Figure 9 The structure shown may be part or all of the structure.

[0168] like Figure 9 As shown, the inverter air conditioner 900 provided in this embodiment includes at least one processor 901, a memory 902, and a user interface 903. The various components in the inverter air conditioner 900 are coupled together via a bus system 909. It can be understood that the bus system 909 is used to realize the connection and communication between these components. In addition to a data bus, the bus system 909 also includes a power bus, a control bus, and a status signal bus. However, for clarity, in... Figure 9 The general labeled all buses as Bus System 909.

[0169] The user interface 903 may include a monitor, keyboard, mouse, trackball, click wheel, buttons, touchpad, or touch screen.

[0170] The memory 902 in this embodiment is used to store various types of data to support the operation of the inverter air conditioner. Examples of such data include any computer program used to operate on the inverter air conditioner.

[0171] The control method for a variable frequency air conditioner disclosed in this application can be applied to, or implemented by, a processor 901. The processor 901 may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the control method for the variable frequency air conditioner can be completed through integrated logic circuits in the hardware of the processor 901 or instructions in software form. The processor 901 can be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 901 can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this application can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software modules can be located in a storage medium, specifically a memory 902. The processor 901 reads information from the memory 902 and, in conjunction with its hardware, completes the steps of the control method for the variable frequency air conditioner provided in the embodiments of this application.

[0172] In an exemplary embodiment, the variable frequency air conditioner may be implemented by one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers (MCUs), microprocessors, or other electronic components to perform the aforementioned method.

[0173] It is understood that memory 902 can be volatile memory or non-volatile memory, or both. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), ferromagnetic random access memory (FRAM), flash memory, magnetic surface memory, optical disc, or compact disc read-only memory (CD-ROM); magnetic surface memory can be disk storage or magnetic tape storage. Volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), SyncLink Dynamic Random Access Memory (SLDRAM), and Direct Rambus Random Access Memory (DRRAM).The memories described in the embodiments of this application are intended to include, but are not limited to, these and any other suitable types of memories.

[0174] In an exemplary embodiment, this application also provides a storage medium, namely a computer storage medium, specifically a computer-readable storage medium, such as a memory 902 that stores a computer program. This computer program can be executed by the processor 901 of the inverter air conditioner to complete the steps described in the method of this application embodiment. The computer-readable storage medium can be a ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disc, or CD-ROM, etc.

[0175] It should be noted that terms such as "first" and "second" are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0176] Furthermore, the technical solutions described in the embodiments of this application can be combined arbitrarily without conflict.

[0177] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A control method for a variable frequency air conditioner, the variable frequency air conditioner comprising: An outdoor heat exchanger, an indoor heat exchanger, and a compressor are connected via refrigerant piping; characterized in that the indoor heat exchanger includes at least two refrigerant branches arranged in parallel, each of the refrigerant branches is equipped with a heat exchange device for heat exchange, and at least one refrigerant branch is equipped with a solenoid valve for turning on or off the refrigerant; the method includes: The inverter air conditioner is controlled to operate in a cooling temperature and humidity control mode; wherein, in the cooling temperature and humidity control mode, at least one of the solenoid valves is activated; Based on the environmental temperature value and the target temperature value, it is determined that the current ambient temperature has reached the set condition; based on the ambient humidity value and the target humidity value, it is determined that the current ambient humidity has exceeded the standard; and based on the surface temperature value of the heat exchange device in operation, it is determined that all surface temperature values ​​are greater than or equal to the first set value. Then, the solenoid valve controlling at least one refrigerant branch of the inverter air conditioner in operation is shut off; the first set value is determined based on the dew point temperature. The method further includes: after the solenoid valve controlling at least one of the refrigerant branches in the variable frequency air conditioner that is in operation is shut off for a set time, acquiring the surface temperature value of the heat exchange device in operation. If the surface temperature values ​​are all greater than or equal to the first set value, the solenoid valve controlling the next refrigerant branch in operation is shut off. If at least one of the surface temperature values ​​is less than or equal to the second set value and greater than or equal to the third set value, then the compressor is subjected to frequency reduction control and / or the opening of the electronic expansion valve of the inverter air conditioner is adjusted. If at least one of the surface temperature values ​​is less than a third set value, then at least one shut-off solenoid valve will be switched to the open state. Wherein, the first setting value is greater than the second setting value, and the second setting value is greater than the third setting value.

2. The method according to claim 1, characterized in that, The frequency reduction control of the compressor includes: The compressor is frequency-reduced based on a set frequency value; or... The compressor is frequency-reduced based on a set percentage of the rated frequency.

3. The method according to claim 1, characterized in that, Adjusting the opening of the electronic expansion valve of the inverter air conditioner includes: Increase the opening of the electronic expansion valve based on the set step size; or, The opening of the electronic expansion valve is increased by a set percentage based on the rated step size.

4. The method according to claim 1, characterized in that, The method further includes: If the ambient temperature is determined to be below the set condition based on the ambient temperature and the target temperature, then at least one shut-off solenoid valve will be switched to the open state, and / or the operating frequency of the compressor of the inverter air conditioner will be increased, and / or the opening of the electronic expansion valve of the inverter air conditioner will be reduced.

5. A control device for a variable frequency air conditioner, the variable frequency air conditioner comprising: An outdoor heat exchanger, an indoor heat exchanger, and a compressor are connected via refrigerant piping; characterized in that the indoor heat exchanger includes at least two refrigerant branches arranged in parallel, each of the refrigerant branches is equipped with a heat exchange device for heat exchange, and at least one refrigerant branch is equipped with a solenoid valve for turning on or off the refrigerant; the control device includes: A control module is used to control the inverter air conditioner to operate in a cooling temperature and humidity control mode; wherein, in the cooling temperature and humidity control mode, at least one of the solenoid valves is turned on; and if it is determined that the current ambient temperature has reached the set condition based on the ambient temperature value and the target temperature value, that the current ambient humidity has exceeded the standard based on the ambient humidity value and the target humidity value, and that all surface temperature values ​​are greater than or equal to a first set value based on the surface temperature values ​​of the heat exchange device in operation, then the solenoid valve of at least one refrigerant branch in operation of the inverter air conditioner is turned off; the first set value is determined based on the dew point temperature; The control module is also used for: After the solenoid valve controlling at least one of the refrigerant branches of the variable frequency air conditioner that is in operation is shut off for a set period of time, the surface temperature value of the heat exchange device that is in operation is obtained. If the surface temperature values ​​are all greater than or equal to the first set value, the solenoid valve controlling the next refrigerant branch in operation is shut off. If at least one of the surface temperature values ​​is less than or equal to the second set value and greater than or equal to the third set value, then the compressor is subjected to frequency reduction control and / or the opening of the electronic expansion valve of the inverter air conditioner is adjusted. If at least one of the surface temperature values ​​is less than a third set value, then at least one shut-off solenoid valve will be switched to the open state. Wherein, the first setting value is greater than the second setting value, and the second setting value is greater than the third setting value.

6. The control device according to claim 5, characterized in that, The control module is also used for: If the ambient temperature is determined to be below the set condition based on the ambient temperature and the target temperature, then at least one shut-off solenoid valve will be switched to the open state, and / or the operating frequency of the compressor of the inverter air conditioner will be increased, and / or the opening of the electronic expansion valve of the inverter air conditioner will be reduced.

7. A variable frequency air conditioner, the variable frequency air conditioner comprising: An outdoor heat exchanger, an indoor heat exchanger, and a compressor are connected via refrigerant piping; characterized in that the indoor heat exchanger includes at least two refrigerant branches arranged in parallel, each refrigerant branch is equipped with a heat exchange device for heat exchange, and at least one refrigerant branch is equipped with a solenoid valve for turning on or off the refrigerant; the inverter air conditioner further includes: a processor and a memory for storing a computer program capable of running on the processor, wherein... The processor, when running a computer program, performs the steps of the method according to any one of claims 1 to 4.

8. A storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 4.

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