Control method of air conditioner, air conditioner, and storage medium

Abstract

The application discloses a control method of an air conditioner, the air conditioner and a storage medium. In the air conditioner, a refrigerant outlet of a first heat exchanger is communicated with a refrigerant inlet of a gas-liquid separator, a liquid outlet of the gas-liquid separator is communicated with a refrigerant inlet of a second heat exchanger, a refrigerant outlet of the second heat exchanger is communicated with a gas return port of a compressor through a first pipeline, a gas outlet of the gas-liquid separator is communicated with the first pipeline through a second pipeline, and the second pipeline is provided with a first electronic expansion valve. The method comprises the following steps: when the air conditioner is in a preset mode, a first temperature of the first heat exchanger is acquired, and a second temperature of the gas-liquid separator is acquired; the first heat exchanger and the second heat exchanger are in an evaporation state in the preset mode; a target opening degree of the first electronic expansion valve is determined according to the first temperature and the second temperature; and the first electronic expansion valve is controlled to operate at the target opening degree. The application aims to improve the heat exchange output capacity of the air conditioner and reduce the system operation power consumption.

Description

Technical Field

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

[0002] With the development of economy and technology and the increasing popularity of air conditioners, the operating performance of air conditioners is also constantly being optimized. At present, many air conditioner refrigerant systems use gas-liquid separators. By setting up a gas-liquid separator in the middle of the evaporator, the refrigerant is separated into gas and liquid states. The separated liquid refrigerant flows back to the evaporator, while the separated gaseous refrigerant flows into the compressor's return port.

[0003] However, the flow rate of the outlet pipe in the gas-liquid separator is currently fixed. If the flow rate is too high, the refrigerant flowing back into the compressor may become liquid, increasing the compressor's operating load. If the flow rate is too low, the gaseous refrigerant in the gas-liquid separator cannot be discharged in time, reducing the separation efficiency. This causes the liquid refrigerant flowing back into the evaporator to be mixed with a lot of gaseous refrigerant, affecting the evaporation efficiency. Both the increase in operating load and the decrease in evaporation efficiency will reduce the heat exchange output capacity of the air conditioner, resulting in a large system power consumption. Summary of the Invention

[0004] The main objective of this invention is to provide a control method for an air conditioner, an air conditioner, and a storage medium, which aims to improve the heat exchange output capacity of the air conditioner and reduce the system's operating power consumption.

[0005] To achieve the above objectives, the present invention provides a control method for an air conditioner. The air conditioner includes a first heat exchanger, a gas-liquid separator, a second heat exchanger, and a compressor. The refrigerant outlet of the first heat exchanger is connected to the refrigerant inlet of the gas-liquid separator, the liquid outlet of the gas-liquid separator is connected to the refrigerant inlet of the second heat exchanger, the refrigerant outlet of the second heat exchanger is connected to the return port of the compressor via a first pipeline, and the gas outlet of the gas-liquid separator is connected to the first pipeline via a second pipeline. The second pipeline is equipped with a first electronic expansion valve. The control method for the air conditioner includes the following steps:

[0006] When the air conditioner is in a preset mode, the first temperature of the first heat exchanger is obtained, and the second temperature of the gas-liquid separator is obtained; in the preset mode, the first heat exchanger and the second heat exchanger are in an evaporation state;

[0007] The target opening degree of the first electronic expansion valve is determined based on the first temperature and the second temperature.

[0008] Control the first electronic expansion valve to operate at the target opening degree.

[0009] Optionally, the step of obtaining the first temperature of the first heat exchanger includes:

[0010] The inlet temperature of the first heat exchanger is obtained as the first temperature;

[0011] And / or, the step of obtaining the second temperature of the gas-liquid separator includes:

[0012] The temperature of the refrigerant inlet of the gas-liquid separator is obtained as the second temperature.

[0013] Optionally, the step of determining the target opening degree of the first electronic expansion valve based on the first temperature and the second temperature includes:

[0014] Determine a first temperature difference value between the second temperature and the first temperature;

[0015] The target opening degree is determined based on the first temperature difference value;

[0016] The target opening degree is positively correlated with the first temperature difference value.

[0017] Optionally, the step of determining the target opening degree based on the first temperature difference value includes:

[0018] Determine the ratio of the first temperature difference value to the set difference value;

[0019] The target opening adjustment value is obtained by correcting the preset opening adjustment value according to the ratio.

[0020] Adjust the initial opening of the first electronic expansion valve according to the target opening adjustment value to obtain the target opening.

[0021] Optionally, before the steps of obtaining the first temperature of the first heat exchanger and the second temperature of the gas-liquid separator when the air conditioner is in a preset mode, the method further includes:

[0022] When the air conditioner starts the preset mode, it controls the first electronic expansion valve to open at an initial opening degree and maintain it for a preset duration.

[0023] Optionally, the air conditioner further includes a second electronic expansion valve connected to the refrigerant inlet of the first heat exchanger, and before the step of controlling the first electronic expansion valve to open at an initial opening degree and maintain it for a preset time, the following steps are also included:

[0024] Obtain the current opening degree of the second electronic expansion valve;

[0025] The initial opening degree is determined based on the current opening degree.

[0026] Optionally, the step of determining the target opening degree of the first electronic expansion valve based on the first temperature and the second temperature includes:

[0027] Obtain the third temperature of the second heat exchanger and / or the return gas temperature of the compressor;

[0028] The target correspondence between the first temperature, the second temperature, and the target opening degree is obtained based on the third temperature and / or the return gas temperature.

[0029] The target opening degree corresponding to the first temperature and the second temperature is determined based on the target correspondence.

[0030] Optionally, the step of obtaining the target correspondence between the first temperature, the second temperature, and the target opening degree based on the third temperature and / or the return gas temperature includes:

[0031] Determine a second temperature difference value between the return gas temperature and the third temperature;

[0032] The target correspondence is obtained based on the second temperature difference value.

[0033] Furthermore, in order to achieve the above objectives, this application also proposes an air conditioner, the air conditioner comprising:

[0034] compressor;

[0035] First heat exchanger;

[0036] Second heat exchanger;

[0037] A gas-liquid separator, wherein the refrigerant outlet of the first heat exchanger is connected to the refrigerant inlet of the gas-liquid separator, the liquid outlet of the gas-liquid separator is connected to the refrigerant inlet of the second heat exchanger, the refrigerant outlet of the second heat exchanger is connected to the return gas port of the compressor through a first pipeline, and the gas outlet of the gas-liquid separator is connected to the first pipeline through a second pipeline, wherein the second pipeline is equipped with a first electronic expansion valve;

[0038] A control device, wherein the first electronic expansion valve and the compressor are both connected to the control device, the control device comprising: a memory, a processor, and an air conditioner control program stored in the memory and executable on the processor, wherein the air conditioner control program, when executed by the processor, implements the steps of the air conditioner control method as described in any of the preceding claims.

[0039] In addition, to achieve the above objectives, this application also proposes a storage medium storing a control program for an air conditioner, which, when executed by a processor, implements the steps of the control method for the air conditioner as described in any of the preceding claims.

[0040] This invention proposes a control method for an air conditioner, which includes a first heat exchanger, a gas-liquid separator, a second heat exchanger, and a compressor connected in sequence. In a preset mode, the gas-liquid separator separates the gas-liquid mixture of refrigerant after evaporation in the first heat exchanger. The resulting liquid refrigerant enters the second heat exchanger for further evaporation. The reduction in gaseous refrigerant entering the second heat exchanger facilitates more liquid refrigerant evaporation and heat exchange, thereby improving the overall evaporation efficiency of both the first and second heat exchangers. Furthermore, the first temperature of the first heat exchanger and the second temperature of the gas-liquid separator reflect the degree of evaporation in the first evaporator, characterizing the evaporation efficiency of the first heat exchanger. The proportion of gaseous refrigerant entering the gas-liquid separator after separation is adjusted by the opening of the first electronic expansion valve on the second gas outlet pipe of the gas-liquid separator according to the first and second temperatures. This ensures that the refrigerant flow rate in the gas outlet pipe of the gas-liquid separator is no longer fixed, but matches the proportion of gaseous refrigerant entering the gas-liquid separator. This helps to improve the purity of the gaseous refrigerant returning to the compressor after separation by the gas-liquid separator, thereby reducing the operating load of the compressor. At the same time, it avoids excessive gaseous refrigerant in the gas-liquid separator, thereby improving the purity of the liquid refrigerant evaporating in the second heat exchanger. This improves the heat exchange output capacity of the air conditioner and reduces the system operating power consumption. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the system structure of an embodiment of the air conditioner of the present invention;

[0042] Figure 2 This is a schematic diagram of the hardware structure involved in the operation of an embodiment of the air conditioner of the present invention;

[0043] Figure 3 This is a flowchart illustrating an embodiment of the control method for an air conditioner according to the present invention;

[0044] Figure 4 This is a flowchart illustrating another embodiment of the control method for an air conditioner according to the present invention;

[0045] Figure 5 This is a flowchart illustrating another embodiment of the control method for the air conditioner of the present invention.

[0046] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0048] The main solution of this invention is as follows: A control method is proposed based on an air conditioner. The air conditioner includes a first heat exchanger, a gas-liquid separator, a second heat exchanger, and a compressor connected in sequence. The refrigerant outlet of the first heat exchanger is connected to the refrigerant inlet of the gas-liquid separator, the liquid outlet of the gas-liquid separator is connected to the refrigerant inlet of the second heat exchanger, the refrigerant outlet of the second heat exchanger is connected to the return gas port of the compressor via a first pipeline, and the gas outlet of the gas-liquid separator is connected to the first pipeline via a second pipeline. The second pipeline is equipped with a first electronic expansion valve. When the air conditioner is in a preset mode, the method obtains a first temperature of the first heat exchanger and a second temperature of the gas-liquid separator. In the preset mode, the first heat exchanger and the second heat exchanger are in an evaporation state. A target opening degree of the first electronic expansion valve is determined based on the first temperature and the second temperature. The first electronic expansion valve is then controlled to operate at the target opening degree.

[0049] In current technology, the flow rate of the outlet pipe in the gas-liquid separator is fixed. If the flow rate is too high, the refrigerant flowing back to the compressor may be in liquid form, increasing the compressor's operating load. If the flow rate is too low, the gaseous refrigerant in the gas-liquid separator cannot be discharged in time, reducing the separation efficiency. This causes the liquid refrigerant flowing back to the evaporator to be mixed with a lot of gaseous refrigerant, affecting the evaporation efficiency. Both the increase in operating load and the decrease in evaporation efficiency will reduce the heat exchange output capacity of the air conditioner, resulting in a large system power consumption.

[0050] The present invention provides the above-mentioned solution, which aims to improve the heat exchange output capacity of the air conditioner and reduce the system operating power consumption.

[0051] This invention provides an air conditioner. The air conditioner can be any type of air conditioner, such as a wall-mounted air conditioner, a cabinet air conditioner, a window air conditioner, a multi-split air conditioner, a ceiling-mounted air conditioner, or a portable air conditioner.

[0052] In this embodiment of the invention, reference is made to Figure 1 The air conditioner includes a control device 1, a compressor 2, a first heat exchanger 51, a second heat exchanger 52, and a gas-liquid separator 6. The first heat exchanger 51, the gas-liquid separator 6, the second heat exchanger 52, and the compressor 2 are connected in sequence.

[0053] Specifically, the air conditioner includes a refrigerant circulation loop, which comprises a compressor 2, a third heat exchanger 3, a throttling device 4, a first heat exchanger 51, a gas-liquid separator 6, and a second heat exchanger 52 connected in sequence. Both the throttling device 4 and the compressor 2 are connected to the control device 1. The compressor 2 can be a fixed-frequency compressor 2 or a variable-frequency compressor 2. In this embodiment, the throttling device 4 includes a second electronic expansion valve. In other embodiments, the throttling device 4 may also include a non-adjustable flow throttling module, such as a capillary tube.

[0054] The first heat exchanger 51, the second heat exchanger 52, and the third heat exchanger 3 can all be located indoors; or, the first heat exchanger 51 and the second heat exchanger 52 can be located indoors, and the third heat exchanger 3 can be located outdoors; or, the first heat exchanger 51 and the second heat exchanger 52 can be located outdoors, and the third heat exchanger 3 can be located indoors.

[0055] When the air conditioner is in preset mode, the refrigerant flowing out of compressor 2 passes sequentially through the third heat exchanger 3, the throttling device 4, the first heat exchanger 51, the gas-liquid separator 6, and the second heat exchanger 52 before flowing back to compressor 2. Both the second heat exchanger 51 and the second heat exchanger 52 are in an evaporating state in preset mode.

[0056] In this embodiment, the heat exchange area of ​​the first heat exchanger 51 is smaller than that of the second heat exchanger 52, which is beneficial for improving the heating capacity of the air conditioner. Specifically, the ratio of the heat exchange area of ​​the first heat exchanger 51 to that of the second heat exchanger 52 is 1:2. In other embodiments, the ratio can also be set to 1:3, 1:4, 2:3, etc. Furthermore, in other embodiments, the heat exchange area of ​​the first heat exchanger 51 can also be greater than or equal to the heat exchange area of ​​the second heat exchanger 52.

[0057] Among them, reference Figure 1 The gas-liquid separator 6 is provided with a refrigerant inlet, a liquid outlet, and a gas outlet. The refrigerant inlet of the first heat exchanger 51 is connected to the refrigerant outlet of the throttling device 4, the refrigerant outlet of the first heat exchanger 51 is connected to the refrigerant inlet of the gas-liquid separator 6, the liquid outlet of the gas-liquid separator 6 is connected to the refrigerant inlet of the second heat exchanger 52, the refrigerant outlet of the second heat exchanger 52 is connected to the return gas port of the compressor 2 through a first pipeline, and the gas outlet of the gas-liquid separator 6 is connected to the aforementioned first pipeline through a second pipeline. The second pipeline is provided with a first electronic expansion valve 7. In other embodiments, the compressor 2 may be provided with a first return gas port and a second return gas port. The refrigerant outlet of the second heat exchanger 52 is connected to the first return gas port through a first pipeline, and the gas outlet of the gas-liquid separator 6 is connected to the second return gas port through a second pipeline. The first pipeline and the second pipeline are independent of each other.

[0058] The first electronic expansion valve 7 is used to control the refrigerant flow rate in the second pipeline. The first electronic expansion valve 7 is connected to the control device 1, which can be used to control the operation of the first electronic expansion valve 7. In this embodiment, the first electronic expansion valve 7 is an electronic expansion valve. In other embodiments, the first electronic expansion valve 7 may also be a solenoid valve or other on / off valve.

[0059] When the air conditioner operates in the preset mode, both the first heat exchanger 51 and the second heat exchanger 52 are in an evaporation state. The refrigerant entering the outdoor unit first evaporates in the first heat exchanger 51, forming a gas-liquid mixture. This gas-liquid mixture then enters the gas-liquid separator 6 for separation. The separated liquid refrigerant flows into the second heat exchanger 52 for further evaporation, while the separated gaseous refrigerant flows from the first pipe into the second pipe and then back to the compressor 2. The separation function of the gas-liquid separator 6 reduces the amount of gaseous refrigerant flowing into the second heat exchanger 52. This reduction in gaseous refrigerant improves the evaporation efficiency of the liquid refrigerant in the second heat exchanger 52. Increased heat exchange efficiency improves the overall heat exchange output capacity of the refrigerant system, thereby increasing the indoor heat output. On the other hand, the separation function of the gas-liquid separator 6 can use gaseous refrigerant to replenish the compressor 2, increasing the proportion of gaseous refrigerant flowing back to the compressor 2. This prevents liquid slugging of the compressor 2 while reducing the operating load of the compressor 2, thereby effectively improving the heat exchange output capacity of the air conditioner and effectively increasing the heat exchange output of the air conditioner on the indoor side.

[0060] Furthermore, in this embodiment, referring to Figure 1 The air conditioner is designed to allow switching between cooling and heating modes. The refrigerant circulation loop may also include a four-way valve 8, which is connected to the control device 1. Two ports of the four-way valve 8 are connected to the exhaust port and return port of the compressor 2, respectively, and the other two ports are connected to the third heat exchanger 3 and the second heat exchanger 52, respectively. The four-way valve 8 has a first valve position and a second valve position. When the four-way valve 8 is in the first valve position, the air conditioner operates in cooling mode; when the four-way valve 8 is in the second valve position, the air conditioner operates in heating mode. In other embodiments, the air conditioner may also be a heating-only type (the first heat exchanger 51 and the second heat exchanger 52 are located outdoors) or a cooling-only type (the first heat exchanger 51 and the second heat exchanger 52 are located indoors), in which case the refrigerant circulation loop of the air conditioner does not include a four-way valve 8.

[0061] Furthermore, in this embodiment, referring to Figure 2 The air conditioner also includes a first temperature sensor 01, which is used to detect a first temperature of the first heat exchanger. The first temperature sensor 01 is connected to a control device, which can be used to acquire the data detected by the first temperature sensor 01. In this embodiment, the first temperature sensor 01 is located at the inlet of the first heat exchanger to detect the inlet temperature of the first heat exchanger; in other embodiments, the first temperature sensor 01 may also be located in the middle of the first heat exchanger or at other locations on the first heat exchanger (such as any location between the middle of the first heat exchanger and the inlet of the first heat exchanger).

[0062] Furthermore, in this embodiment, referring to Figure 2The air conditioner also includes a second temperature sensor 02, which is used to detect the second temperature of the gas-liquid separator. The second temperature sensor 02 is connected to a control device, which can be used to acquire the data detected by the second temperature sensor 02. In this embodiment, the second temperature sensor 02 is located at the refrigerant inlet of the gas-liquid separator to detect the inlet temperature of the gas-liquid separator. In other embodiments, the second temperature sensor 02 can also be located on the inner wall of the gas-liquid separator, at the gas outlet of the gas-liquid separator, at the liquid outlet of the gas-liquid separator, or at other locations. It should be noted that the second temperature sensor 02 and the first temperature sensor 01 are spaced apart, and the distance between them is greater than a preset distance.

[0063] Among them, reference Figure 2 The control device 1 of the air conditioner includes a processor 1001 (e.g., CPU), a memory 1002, a timer 1003, etc. The components in the control device 1 are connected via a communication bus. The memory 1002 can be a high-speed RAM or a stable, non-volatile memory, such as a disk drive. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0064] Those skilled in the art will understand that Figure 2 The device structure shown does not constitute a limitation on the device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0065] like Figure 2 As shown, the memory 1002, which is a computer-readable storage medium, may include a control program for an air conditioner. Figure 2 In the device shown, the processor 1001 can be used to call the control program of the air conditioner stored in the memory 1002 and execute the relevant steps of the control method of the air conditioner in the following embodiments.

[0066] This invention also provides a control method for an air conditioner, applied to the aforementioned air conditioner.

[0067] Reference Figure 3 This application proposes an embodiment of a control method for an air conditioner. In this embodiment, the control method for the air conditioner includes:

[0068] Step S10: When the air conditioner is in a preset mode, obtain the first temperature of the first heat exchanger and the second temperature of the gas-liquid separator; in the preset mode, the first heat exchanger and the second heat exchanger are in an evaporation state.

[0069] When the first heat exchanger and the second heat exchanger are located indoors, the preset mode is the cooling mode of the air conditioner; when the first heat exchanger and the second heat exchanger are located outdoors, the preset mode is the heating mode of the air conditioner.

[0070] When the air conditioner is in a preset mode, it can acquire the data currently detected by the first temperature sensor as the first temperature, and acquire the data currently detected by the second temperature sensor as the second temperature. The first temperature can be the temperature detected by the first temperature sensor at one location on the first heat exchanger, or it can be the temperature determined based on the data detected by the first temperature sensors at multiple different locations on the first heat exchanger; the second temperature can be the temperature detected by the second temperature sensor at one location on the gas-liquid separator, or it can be the temperature determined based on the data detected by the second temperature sensors at multiple different locations on the gas-liquid separator.

[0071] Step S20: Determine the target opening degree of the first electronic expansion valve based on the first temperature and the second temperature;

[0072] The target opening degree is specifically the target value required to achieve the opening degree of the first electronic expansion valve, which is used to ensure that the proportion of gaseous refrigerant flowing from the gas-liquid separator into the compressor from the outlet is greater than the total amount of refrigerant flowing into the compressor.

[0073] Different first temperatures and different second temperatures correspond to different target opening degrees. The correspondence between the first temperature, the second temperature, and the target opening degree is a pre-set fixed relationship, but a target correspondence is also selected from multiple pre-set relationships based on the actual operating conditions of the air conditioner in a preset mode. The correspondence between the first temperature, the second temperature, and the target opening degree can take various forms, such as calculation formulas or mapping relationships. Based on this correspondence, the target opening degree corresponding to the first temperature and the second temperature can be determined.

[0074] Step S30: Control the first electronic expansion valve to operate at the target opening.

[0075] This invention proposes a control method for an air conditioner. The air conditioner includes a first heat exchanger, a gas-liquid separator, a second heat exchanger, and a compressor connected in sequence. In a preset mode, the gas-liquid separator separates the gas-liquid mixture of refrigerant after evaporation in the first heat exchanger. The resulting liquid refrigerant enters the second heat exchanger for further evaporation. The reduction of gaseous refrigerant entering the second heat exchanger facilitates more liquid refrigerant evaporation and heat exchange, thereby improving the overall evaporation efficiency of both the first and second heat exchangers. Furthermore, the first temperature of the first heat exchanger and the second temperature of the gas-liquid separator reflect the degree of evaporation in the first heat exchanger, characterizing the first heat exchange process. The proportion of gaseous refrigerant entering the gas-liquid separator after evaporation is adjusted by the opening of the first electronic expansion valve on the second gas outlet pipe of the gas-liquid separator according to the first and second temperatures. This ensures that the refrigerant flow rate in the gas outlet pipe of the gas-liquid separator is no longer fixed, but matches the proportion of gaseous refrigerant entering the gas-liquid separator. This helps to improve the purity of the gaseous refrigerant returning to the compressor after separation by the gas-liquid separator, thereby reducing the operating load of the compressor. At the same time, it avoids excessive gaseous refrigerant in the gas-liquid separator, thus improving the purity of the liquid refrigerant evaporating in the second heat exchanger. This improves the heat exchange output capacity of the air conditioner and reduces the system operating power consumption.

[0076] Furthermore, based on the above embodiments, another embodiment of the control method for the air conditioner of this application is proposed. In this embodiment, reference is made to... Figure 4 Step S20 includes:

[0077] Step S21: Determine the first temperature difference value between the second temperature and the first temperature;

[0078] In this embodiment, the first temperature difference is the calculated result obtained by subtracting the first temperature from the second temperature. In other embodiments, the first temperature difference is also the absolute value of the calculated result obtained by subtracting the second temperature from the first temperature.

[0079] In this embodiment, the inlet temperature of the first heat exchanger is obtained as the first temperature, and the temperature of the refrigerant inlet of the gas-liquid separator is obtained as the second temperature. Based on this, the first temperature difference value can accurately reflect the degree of evaporation of the first evaporator and accurately characterize the proportion of gaseous state in the refrigerant entering the gas-liquid separator after evaporation of the first heat exchanger.

[0080] In other embodiments, the inlet temperature of the first heat exchanger is obtained as the first temperature, and the second temperature can also be a temperature other than the refrigerant inlet temperature of the gas-liquid separator, such as the temperature of the gas outlet of the gas-liquid separator; the temperature of the refrigerant inlet of the gas-liquid separator is obtained as the second temperature, and the first temperature can also be a temperature other than the inlet temperature of the first heat exchanger, such as the temperature of the middle part of the first evaporator. Based on this, the first temperature difference value can also reflect the degree of evaporation of the first evaporator and the proportion of gaseous state in the refrigerant entering the gas-liquid separator after evaporation in the first heat exchanger to a certain extent.

[0081] Step S22: Determine the target opening degree based on the first temperature difference value; wherein the target opening degree is positively correlated with the first temperature difference value.

[0082] The magnitude of the first temperature difference value specifically characterizes the proportion of gaseous refrigerant entering the gas-liquid separator relative to the total refrigerant volume. A larger first temperature difference value indicates a larger proportion of gaseous refrigerant, and vice versa. In this embodiment, a larger first temperature difference value results in a larger target opening degree; conversely, a smaller first temperature difference value results in a smaller target opening degree. In this embodiment, the target opening degree and the temperature difference value are linearly positively correlated. In other embodiments, the target opening degree and the temperature difference value also exhibit an exponentially positive correlation.

[0083] In this embodiment, the ratio of the first temperature difference value to a set difference value is determined; a preset opening adjustment value is corrected according to the ratio to obtain a target opening adjustment value; and the initial opening of the first electronic expansion valve is adjusted according to the target opening adjustment value to obtain the target opening. The set difference value is specifically a pre-set critical temperature difference value used to distinguish the amount of gaseous refrigerant entering the gas-liquid separator from the first heat exchanger. The initial opening is specifically a pre-set reference opening value for the first electronic expansion valve, with the initial opening value ranging from 30% to 60% of the maximum allowable opening value of the first electronic expansion valve. The target opening adjustment value is positively correlated with the ratio. In this embodiment, the product of the ratio and the preset opening value is used as the target opening adjustment value, and the sum of the target opening adjustment value and the initial opening is used as the target opening. For example, the target opening is calculated according to the target opening P = P0 + (ΔT / ΔTset) * ΔP, where ΔT is the first temperature difference value, ΔTset is the set difference value, and ΔP is the preset opening value. In other embodiments, the result of dividing the preset opening by a ratio or subtracting the ratio can be used as the target opening adjustment value, and the difference or product between the initial opening and the target opening adjustment value can be used as the target opening value, and so on. Alternatively, the result obtained by querying a preset mapping table using the ratio can also be used as the target opening.

[0084] In this embodiment, the first temperature difference between the second temperature and the first temperature accurately reflects the degree of evaporation of the first heat exchanger and the proportion of gaseous refrigerant flowing into the gas-liquid separator after evaporation in the first heat exchanger. This first temperature difference is used to determine the target opening of the first electronic expansion valve, which helps improve the accuracy of the determined target opening. This, in turn, helps to further improve the purity of the gaseous refrigerant returning to the compressor and the purity of the liquid refrigerant entering the second heat exchanger, thereby further improving the heat exchange output capacity of the air conditioner and further reducing the system's operating power consumption. Furthermore, the ratio of the first temperature difference to a set difference more accurately reflects the accuracy of the gaseous refrigerant entering the gas-liquid separator. By correcting the target opening adjustment value obtained from the preset opening value using this ratio, the initial opening of the first electronic expansion valve is adjusted to obtain the target opening, further improving the accuracy of the target opening. This, in turn, further improves the heat exchange output capacity of the air conditioner and further reduces the system's operating power consumption.

[0085] In other embodiments, a ratio of a first temperature to a second temperature is also determined, and a target opening degree of the first electronic expansion valve is determined based on the determined ratio, wherein the target opening degree is negatively correlated with the ratio. Alternatively, after determining the first temperature difference value, the target opening degree can also be determined based on the difference, sum, or product between the first temperature difference value and a set difference value.

[0086] Furthermore, based on any of the above embodiments, another embodiment of the control method for the air conditioner of this application is proposed. In this embodiment, before step S10, the method further includes:

[0087] When the air conditioner starts the preset mode, it controls the first electronic expansion valve to open at an initial opening degree and maintain it for a preset duration.

[0088] The initial opening degree here refers to the same concept as the initial opening degree in the above embodiments, and will not be elaborated here.

[0089] While the first electronic expansion valve opens at its initial opening and maintains it for a preset duration, the second electronic expansion valve operates at its set opening according to the current operating conditions of the air conditioner.

[0090] In this embodiment, after the preset mode is activated, the first electronic expansion valve opens at its initial opening for a preset time before further detecting the first temperature and the second temperature. This ensures the accuracy of the obtained first and second temperatures in characterizing the proportion of gaseous refrigerant entering the gas-liquid separator. This facilitates precise control of the first electronic expansion valve based on the target opening determined by the first and second temperatures, thereby further improving the heat exchange output capacity of the air conditioner and reducing the system's operating power consumption.

[0091] Furthermore, in this embodiment, the air conditioner also includes a second electronic expansion valve connected to the refrigerant inlet of the first heat exchanger. Before the step of controlling the first electronic expansion valve to open at an initial opening degree and maintain it for a preset duration, the method further includes: obtaining the current opening degree of the second electronic expansion valve; and determining the initial opening degree based on the current opening degree. Specifically, different current opening degrees of the second electronic expansion valve correspond to different initial opening degrees. The initial opening degree and the current opening degree are negatively correlated. Specifically, the initial opening degree of the first electronic expansion valve can be calculated from the current opening degree of the second electronic expansion valve, or the range in which the current opening degree of the second electronic expansion valve is located can be determined, and the preset opening degree corresponding to this range can be used as the initial opening degree of the first electronic expansion valve. Specifically, the current rotational speed of the fans corresponding to the first and second heat exchangers (e.g., indoor fans when the first and second heat exchangers are located indoors, outdoor fans when the first and second heat exchangers are located outdoors, etc.) can be obtained. Based on the current rotational speed, the correspondence between the initial opening and the current opening is obtained; different current rotational speeds correspond to different correspondences. Based on the obtained correspondence, the initial opening corresponding to the current opening can be determined. Here, the initial opening of the first electronic expansion valve is controlled by the current opening of the second electronic expansion valve. This ensures that after the first electronic expansion valve operates at its initial opening, it can quickly adjust to the target opening matching the first and second temperatures when operating at the target opening corresponding to the first and second temperatures, further avoiding an increase in compressor operating load and system energy consumption.

[0092] Furthermore, based on any of the above embodiments, another embodiment of the control method for the air conditioner of this application is proposed. In this embodiment, reference is made to... Figure 5 Step S20 includes:

[0093] Step S201: Obtain the third temperature of the second heat exchanger and / or the return gas temperature of the compressor;

[0094] In this embodiment, the third temperature is specifically the temperature of the refrigerant outlet of the second heat exchanger. In other embodiments, the third temperature may also be the temperature at the middle of the second heat exchanger, and so on.

[0095] Step S202: Obtain the target correspondence between the first temperature, the second temperature, and the target opening degree based on the third temperature and / or the return gas temperature;

[0096] In this embodiment, the target correspondence is obtained based on the third temperature and the return gas temperature. Different third temperatures and different return gas temperatures correspond to different target correspondences. In other embodiments, the target correspondence can also be obtained based on either the third temperature or the return gas temperature. Different third temperatures result in different target correspondences, and different return gas temperatures result in different target correspondences. Specifically, the correspondence between the first temperature difference value and the target opening can be determined based on the third temperature and / or the return gas temperature as the target correspondence. Further, the first sub-relationship between the set difference value, the preset opening value, the ratio, and the target opening adjustment value, and the second sub-relationship between the target opening adjustment value, the initial opening, and the target opening can be determined based on the third temperature and / or the return gas temperature. The target correspondence includes the set difference value, the first sub-relationship, and the second sub-relationship.

[0097] Specifically, in this embodiment, a second temperature difference value is determined between the return gas temperature and the third temperature; the target correspondence is obtained based on the second temperature difference value. In this embodiment, the second temperature difference value is specifically the result calculated by subtracting the third temperature from the return gas temperature. In other embodiments, the second temperature difference value can also be the absolute value of the result calculated by subtracting the return gas temperature from the third temperature. Different second temperature difference values ​​correspond to different target correspondences. Specifically, in this embodiment, the second temperature difference value is positively correlated with the target opening degree corresponding to the first temperature difference value in the corresponding target correspondence.

[0098] In other embodiments, the target correspondence can also be obtained based on the ratio between the return gas temperature and the third temperature.

[0099] Step S203: Determine the target opening degree corresponding to the first temperature and the second temperature according to the target correspondence relationship.

[0100] In this embodiment, determining the target opening degree corresponding to the first and second temperatures based on the correspondence between the return gas temperature and / or the third temperature target of the second heat exchanger helps to effectively improve the accuracy of the determined target opening degree. This ensures that the purity of the gaseous refrigerant entering the compressor after mixing with the refrigerant flowing out of the second pipeline in the first pipeline is effectively improved, further reducing the operating load of the compressor and thus effectively improving the heat exchange output capacity of the air conditioner. Specifically, combining the second temperature difference value between the return gas temperature and the third temperature to obtain the target correspondence, the second temperature difference value can accurately characterize the impact of the mixing of the refrigerant flowing out of the second pipeline and the refrigerant in the first pipeline on the gaseous purity of the refrigerant flowing into the compressor, which helps to improve the accuracy of the target correspondence and thus further improve the heat exchange output capacity of the air conditioner.

[0101] Furthermore, this embodiment of the invention also proposes a storage medium storing a control program for an air conditioner. When the control program for the air conditioner is executed by a processor, it implements the relevant steps of any embodiment of the control method for the air conditioner described above.

[0102] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0103] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0104] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0105] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A control method of an air conditioner, characterized by, The air conditioner includes a first heat exchanger, a gas-liquid separator, a second heat exchanger, and a compressor. The refrigerant outlet of the first heat exchanger is connected to the refrigerant inlet of the gas-liquid separator, the liquid outlet of the gas-liquid separator is connected to the refrigerant inlet of the second heat exchanger, the refrigerant outlet of the second heat exchanger is connected to the return port of the compressor via a first pipeline, and the gas outlet of the gas-liquid separator is connected to the first pipeline via a second pipeline. The second pipeline is equipped with a first electronic expansion valve. The control method of the air conditioner includes the following steps: When the air conditioner is in a preset mode, the inlet temperature of the first heat exchanger is obtained as the first temperature, and the refrigerant inlet temperature of the gas-liquid separator is obtained as the second temperature; in the preset mode, the first heat exchanger and the second heat exchanger are in an evaporation state. The target opening degree of the first electronic expansion valve is determined based on the first temperature and the second temperature. The target opening degree is the target value required to achieve the opening degree of the first electronic expansion valve so that the proportion of gaseous refrigerant flowing from the gas-liquid separator into the compressor from the outlet is greater than a set proportion in the total amount of refrigerant flowing into the compressor. Control the first electronic expansion valve to operate at the target opening degree.

2. The control method of the air conditioner according to claim 1, wherein The step of determining the target opening degree of the first electronic expansion valve based on the first temperature and the second temperature includes: Determine a first temperature difference value between the second temperature and the first temperature; The target opening degree is determined based on the first temperature difference value; The target opening degree is positively correlated with the first temperature difference value.

3. The control method of the air conditioner according to claim 2, wherein The step of determining the target opening degree based on the first temperature difference value includes: Determine the ratio of the first temperature difference value to the set difference value; The target opening adjustment value is obtained by correcting the preset opening adjustment value according to the ratio. Adjust the initial opening of the first electronic expansion valve according to the target opening adjustment value to obtain the target opening.

4. The control method of the air conditioner according to claim 1, wherein Before the step of obtaining the first temperature of the first heat exchanger and the second temperature of the gas-liquid separator when the air conditioner is in a preset mode, the method further includes: When the air conditioner starts the preset mode, it controls the first electronic expansion valve to open at an initial opening degree and maintain it for a preset duration.

5. The control method of the air conditioner according to claim 4, wherein The air conditioner further includes a second electronic expansion valve connected to the refrigerant inlet of the first heat exchanger. Before the step of controlling the first electronic expansion valve to open at an initial opening degree and maintain it for a preset duration, the following steps are also included: Obtain the current opening degree of the second electronic expansion valve; The initial opening degree is determined based on the current opening degree.

6. The control method of an air conditioner according to any one of claims 1 to 5, characterized by, The step of determining the target opening degree of the first electronic expansion valve based on the first temperature and the second temperature includes: Obtain the third temperature of the second heat exchanger and / or the return gas temperature of the compressor; The target correspondence between the first temperature, the second temperature, and the target opening degree is obtained based on the third temperature and / or the return gas temperature. The target opening degree corresponding to the first temperature and the second temperature is determined based on the target correspondence.

7. The control method for an air conditioner as described in claim 6, characterized in that, The step of obtaining the target correspondence between the first temperature, the second temperature, and the target opening degree based on the third temperature and / or the return gas temperature includes: Determine a second temperature difference value between the return gas temperature and the third temperature; The target correspondence is obtained based on the second temperature difference value.

8. An air conditioner, characterized in that, The air conditioner includes: compressor; First heat exchanger; Second heat exchanger; A gas-liquid separator, wherein the refrigerant outlet of the first heat exchanger is connected to the refrigerant inlet of the gas-liquid separator, the liquid outlet of the gas-liquid separator is connected to the refrigerant inlet of the second heat exchanger, the refrigerant outlet of the second heat exchanger is connected to the return gas port of the compressor through a first pipeline, and the gas outlet of the gas-liquid separator is connected to the first pipeline through a second pipeline, wherein the second pipeline is equipped with a first electronic expansion valve; The control device includes the first electronic expansion valve and the compressor. The air conditioner includes a memory, a processor, and a control program for an air conditioner stored in the memory and executable on the processor, wherein the control program for the air conditioner, when executed by the processor, implements the steps of the control method for an air conditioner as described in any one of claims 1 to 7.

9. A storage medium, characterized in that, The storage medium stores a control program for an air conditioner, which, when executed by a processor, implements the steps of the control method for an air conditioner as described in any one of claims 1 to 7.

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