An indoor unit for air conditioning, a control method, a controller, and an air conditioning system.

Abstract

This disclosure discloses an air conditioning indoor unit, a control method, a controller, and an air conditioning system, relating to the field of air conditioning unit technology. The air conditioning indoor unit includes: a liquid pipe comprising a first section and a second section, one end of the second section connected to the first section and the other end connected to the evaporator inlet pipe; a throttling element disposed on the second section and configured to throttle the refrigerant flowing from the first section into the second section; and a heat exchange element configured to exchange heat between the throttled refrigerant in the second section and the refrigerant in the first section. With this air conditioning indoor unit, the subcooling of the refrigerant before throttling can be increased with or without adding any components, saving space and cost for the indoor unit.

Description

Technical Field

[0001] This disclosure relates to the field of air conditioning unit technology, and in particular to an air conditioning indoor unit, control method, controller and air conditioning system. Background Technology

[0002] Currently, some air conditioning systems add a subcooler to the outdoor unit. In the outdoor unit's heat exchanger, the high-temperature, gaseous refrigerant first passes through the condenser to release heat. Then, as the refrigerant passes through the subcooler, it is divided into a main circuit and a bypass circuit. The refrigerant in the bypass circuit undergoes throttling to reduce its temperature and pressure. Then, the cooled refrigerant in the bypass circuit is used to cool the refrigerant in the main circuit, thereby increasing the subcooling degree of the refrigerant entering the indoor unit, resulting in better cooling performance and an improved user experience.

[0003] However, due to limited internal space in the outdoor unit, there are significant restrictions on adding a subcooler. Therefore, some outdoor units lack a subcooler, which can result in insufficient subcooling of the refrigerant entering the indoor unit. Furthermore, even if a subcooler is installed in the outdoor unit, the long connecting pipes between the outdoor and indoor units can cause a significant pressure drop in the refrigerant, further reducing the subcooling of the refrigerant entering the indoor unit. When the refrigerant reaches the indoor unit with insufficient subcooling, its state may change, potentially becoming a two-phase (gas-liquid) refrigerant, leading to poor cooling performance. Moreover, the two-phase refrigerant, when passing through the electronic expansion valve in the indoor unit for throttling, can generate liquid flow noise, resulting in a poor user experience.

[0004] To address the aforementioned issues, related technology 1 proposes a self-subcooling air conditioning indoor unit, which exchanges heat between the main liquid line of the indoor unit and another branch line branching off from the liquid line to increase the subcooling degree of the refrigerant in the main liquid line. Related technology 2 proposes a self-subcooling structure, which exchanges heat between the liquid line and the gas line of the indoor unit to increase the subcooling degree of the refrigerant in the liquid line. Summary of the Invention

[0005] This disclosure provides an indoor air conditioning unit, a control method, a controller, and an air conditioning system.

[0006] According to a first aspect of this disclosure, an indoor air conditioning unit is provided, comprising: a liquid pipe including a first section of pipe and a second section of pipe, one end of the second section of pipe being connected to the first section of pipe and the other end being connected to the inlet pipe of an evaporator; a throttling element disposed on the second section of pipe and configured to throttle the refrigerant flowing from the first section of pipe into the second section of pipe; and a heat exchange element configured to exchange heat between the throttled refrigerant in the second section of pipe and the refrigerant in the first section of pipe.

[0007] In some embodiments, the throttling element is an electronic expansion valve.

[0008] In some embodiments, the heat exchange element includes: a plate heat exchanger or a tubular heat exchanger disposed in the second section of the pipeline after being throttled by the throttling element and on the first section of the pipeline; or, a heat dissipation block disposed in the second section of the pipeline after being throttled by the throttling element and between it and the first section of the pipeline; or, a heat dissipation adhesive applied to the second section of the pipeline after being throttled by the throttling element and to the first section of the pipeline, wherein the second section of the pipeline after being throttled by the throttling element is adjacent to or wrapped around the first section of the pipeline.

[0009] In some embodiments, the indoor unit of the air conditioner further includes a controller configured to: determine superheat based on the temperature of the refrigerant in the outlet pipe of the evaporator and the temperature of the refrigerant in the inlet pipe of the evaporator; determine subcooling based on the temperature of the refrigerant in the first section of the pipe after being cooled by the heat exchange element and the temperature of the refrigerant in the first section of the pipe before being cooled by the heat exchange element; in cooling mode, determine whether to adjust the opening of the electronic expansion valve based on the superheat and the subcooling; and after determining to adjust the opening of the electronic expansion valve, output indication information of the opening adjustment mode of the electronic expansion valve.

[0010] In some embodiments, the controller determines whether to adjust the opening of the electronic expansion valve based on the superheat and the subcooling, including: if the absolute value of the difference between the superheat and the target superheat is greater than a superheat deviation threshold, or if the absolute value of the difference between the subcooling and the target subcooling is greater than a subcooling deviation threshold, then the controller determines to adjust the opening of the electronic expansion valve; otherwise, the controller determines not to adjust the opening of the electronic expansion valve.

[0011] In some embodiments, the controller determines the opening adjustment mode of the electronic expansion valve according to the following methods: determining a first adjustment mode of the electronic expansion valve based on the superheat; determining a second adjustment mode of the electronic expansion valve based on the subcooling; when the first adjustment mode and the second adjustment mode are inconsistent, using the adjustment mode with higher priority between the first adjustment mode and the second adjustment mode as the opening adjustment mode of the electronic expansion valve; when the first adjustment mode and the second adjustment mode are consistent, using either the first adjustment mode or the second adjustment mode as the opening adjustment mode of the electronic expansion valve.

[0012] In some embodiments, the priorities of the first adjustment method and the second adjustment method satisfy the following: when the superheat is greater than or equal to 1 and less than the target superheat, and the subcooling is less than the target subcooling, the priority of the second adjustment method is higher than the priority of the first adjustment method; when the superheat is less than 1 and less than the target superheat, and the subcooling is less than the target subcooling, the priority of the first adjustment method is higher than the priority of the second adjustment method; when the superheat is greater than the target superheat, and the subcooling is greater than the target subcooling, the priority of the first adjustment method is higher than the priority of the second adjustment method.

[0013] In some embodiments, determining the first adjustment method of the electronic expansion valve based on the superheat includes: when the absolute value of the difference between the superheat and the target superheat is greater than a superheat deviation threshold and the superheat is less than the target superheat, the first adjustment method is to decrease the opening of the electronic expansion valve; when the absolute value of the difference between the superheat and the target superheat is greater than a superheat deviation threshold and the superheat is greater than the target superheat, the first adjustment method is to increase the opening of the electronic expansion valve. Determining the second adjustment method of the electronic expansion valve based on the subcooling includes: when the absolute value of the difference between the subcooling and the target subcooling is greater than a subcooling deviation threshold and the subcooling is less than the target subcooling, the second adjustment method is to increase the opening of the electronic expansion valve; when the absolute value of the difference between the subcooling and the target subcooling is greater than a subcooling deviation threshold and the subcooling is greater than the target subcooling, the second adjustment method is to decrease the opening of the electronic expansion valve.

[0014] In some embodiments, the target superheat is a value greater than 0 and less than or equal to 5 degrees Celsius, and the target supercooling is a value greater than or equal to 6 degrees Celsius and less than or equal to 20 degrees Celsius.

[0015] In some embodiments, the superheat deviation threshold and the supercool deviation threshold are values ​​greater than 0 and less than or equal to 1 degree Celsius.

[0016] In some embodiments, the indoor unit of the air conditioner further includes: a first temperature sensor disposed on the outlet pipe of the evaporator for measuring the temperature of the refrigerant in the outlet pipe of the evaporator; a second temperature sensor disposed on the inlet pipe of the evaporator for measuring the temperature of the refrigerant in the inlet pipe of the evaporator; and a third temperature sensor disposed on the first section of the pipe for measuring the temperature of the refrigerant in the first pipe after being cooled by the heat exchange element.

[0017] According to a second aspect of this disclosure, a control method is provided for use in an air conditioning indoor unit as described above, comprising: determining superheat based on the temperature of the refrigerant in the outlet pipe of the evaporator and the temperature of the refrigerant in the inlet pipe of the evaporator; determining subcooling based on the temperature of the refrigerant in the first section of the pipe after being cooled by the heat exchange element and the temperature of the refrigerant in the first section of the pipe before being cooled by the heat exchange element; and in a cooling mode, determining whether to adjust the opening degree of the throttling element based on the superheat and the subcooling, and outputting indication information of the throttling element opening degree adjustment mode after determining that the opening degree of the throttling element should be adjusted.

[0018] According to a third aspect of this disclosure, a controller is provided for use in an air conditioning indoor unit as described above, comprising: a first determining module configured to determine superheat based on the temperature of the refrigerant in the outlet pipe of the evaporator and the temperature of the refrigerant in the inlet pipe of the evaporator; a second determining module configured to determine subcooling based on the temperature of the refrigerant in the first section of the pipe after being cooled by the heat exchange element and the temperature of the refrigerant in the first section of the pipe before being cooled by the heat exchange element; a judging module configured to, in a cooling mode, determine whether to adjust the opening degree of the throttling element based on the superheat and the subcooling; and an adjusting module configured to, after determining that the opening degree of the throttling element should be adjusted, output indication information of the adjustment mode of the throttling element opening.

[0019] According to a fourth aspect of this disclosure, an air conditioning system is provided, comprising: an indoor air conditioning unit as described above, or a controller as described above.

[0020] According to a fifth aspect of this disclosure, a controller is provided, comprising: a memory; and a processor coupled to the memory, the processor being configured to execute the control method as described above based on instructions stored in the memory.

[0021] According to a sixth aspect of this disclosure, a computer-readable storage medium is provided that stores computer program instructions thereon, which, when executed by a processor, implement the control method as described above.

[0022] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0023] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure.

[0024] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0025] Figure 1 This is a schematic diagram of the structure of an indoor air conditioner unit according to some embodiments of the present disclosure;

[0026] Figure 2 This is a schematic diagram of the structure of a heat exchange element according to some embodiments of the present disclosure;

[0027] Figure 3 This is a schematic diagram of the structure of a heat exchange element according to other embodiments of this disclosure;

[0028] Figure 4 This is a flowchart illustrating a control method according to some embodiments of the present disclosure;

[0029] Figure 5 This is a flowchart illustrating a control method according to other embodiments of the present disclosure;

[0030] Figure 6 This is a schematic diagram of the structure of a controller according to some embodiments of the present disclosure;

[0031] Figure 7 This is a schematic diagram of the structure of a controller according to some other embodiments of the present disclosure.

[0032] Figure 8 This is a schematic diagram of the structure of an air conditioning system according to some embodiments of the present disclosure. Detailed Implementation

[0033] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0034] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0035] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0036] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0037] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0039] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0040] In related technologies 1 and 2, heat exchange is performed between different pipelines to increase subcooling. This approach requires more components, occupies more space between pipelines for heat exchange, and incurs higher costs.

[0041] In view of this, this disclosure proposes an air conditioning indoor unit, a control method, a controller, and an air conditioning system, which can increase the subcooling of the refrigerant before it enters the indoor unit by adding a few components or without adding any components, thereby saving space and cost of the indoor unit.

[0042] Figure 1 This is a schematic diagram of the structure of an indoor air conditioner unit according to some embodiments of this disclosure. Figure 1 As shown, the indoor unit of the air conditioner includes a liquid pipe 1, a throttling element 2, and a heat exchange element 3.

[0043] Liquid pipe 1 includes a first section 101 and a second section 102. One end of the second section 102 is connected to the first section 101, and the other end is connected to the inlet pipe 5 of the evaporator 4.

[0044] Throttling element 2, disposed on the second section of pipe 102, is configured to throttle the refrigerant flowing from the first section of pipe 101 into the second section of pipe 102.

[0045] In some embodiments, the throttling element 1 is an electronic expansion valve. Furthermore, in specific implementations, the throttling element 1 can also be other components capable of throttling and cooling.

[0046] The heat exchange element 3 is configured to exchange heat between the refrigerant throttled in the second section of the pipe 102 and the refrigerant in the first section of the pipe 101.

[0047] In some embodiments, refrigerant from the outdoor unit flows from the first section 101 of the liquid line 1 into the second section 102. After being throttled and cooled by the electronic expansion valve on the second section 102, it flows into the evaporator for evaporation and heat exchange, and then returns to the outdoor unit through the outlet pipe 6 of the evaporator 4. During the circulation of the refrigerant, the refrigerant in the second section 102, after being throttled and cooled by the electronic expansion valve, exchanges heat with the refrigerant in the first section 101 through the heat exchange element 3, thereby achieving cooling of the refrigerant before throttling.

[0048] In some embodiments, the heat exchange element 3 is a plate heat exchanger. The plate heat exchanger is disposed in the second section of the pipeline after being throttled by the throttling element 2, and on the first section of the pipeline.

[0049] In some embodiments, the heat exchange element 3 is a shell-and-tube heat exchanger. The shell-and-tube heat exchanger is disposed in the second section of the pipeline 102 after being throttled by the throttling element 2, and on the first section of the pipeline.

[0050] In some embodiments, the heat exchange element 3 is a heat sink. The heat sink is disposed between the portion of the second pipe section 102 after being throttled by the throttling element 2 and the first pipe section 101. For example, the first pipe section and the second pipe section are arranged side by side, and a metal block such as an aluminum block is added between them to facilitate subcooling heat exchange between the first pipe section and the second pipe section.

[0051] In some embodiments, the heat exchange element 3 is a heat dissipation adhesive, applied to the portion of the second pipe 102 after being throttled by the throttling element 2, and also applied to the first pipe 101. The portion of the second pipe 102 after being throttled by the throttling element 2 is adjacent to or wrapped around the first pipe 101. Furthermore, in specific implementations, the heat exchange element 3 can also be other forms of components capable of heat exchange between two fluids with a temperature difference.

[0052] In this embodiment, by utilizing the low-temperature refrigerant in the indoor unit after throttling and before evaporation, and exchanging heat with the refrigerant before throttling through a heat exchange element, the following technical effects can be achieved: 1. Increasing the subcooling of the refrigerant entering the indoor unit, reducing dependence on the subcooling of the outdoor unit; 2. Reducing subcooling loss during refrigerant transmission, ensuring that the refrigerant reaching the indoor unit before throttling is in a liquid state, alleviating the problem of liquid flow noise generated when the gas-liquid two-phase refrigerant is throttled by the throttling element of the indoor unit, and improving the user experience; 3. Reducing energy loss in the pipeline and lowering the risk of condensation by increasing the subcooling of the refrigerant entering the indoor unit; 4. Increasing the subcooling of the refrigerant before throttling in the indoor unit with a small number of additional components or without adding any components, further saving space and cost of the indoor unit.

[0053] In some embodiments, the indoor unit of the air conditioner also includes a controller ( Figure 1(Not shown in the image). The controller is configured to determine the superheat based on the temperature of the refrigerant in the outlet pipe 6 of the evaporator 4 and the temperature of the refrigerant in the inlet pipe 5 of the evaporator 4; determine the subcooling based on the temperature of the refrigerant in the first pipe 101 after being cooled by the heat exchange element 3 and the temperature of the refrigerant in the first pipe 101 before being cooled by the heat exchange element; in cooling mode, determine whether to adjust the opening of the electronic expansion valve based on the superheat and subcooling; and after determining that the opening of the electronic expansion valve should be adjusted, output indication information of the opening adjustment mode of the electronic expansion valve.

[0054] Generally, cooling a liquid refrigerant below its saturation temperature while maintaining a constant saturation pressure is called subcooling. The absolute value of the temperature difference between the subcooled liquid and its saturation temperature is called the degree of subcooling. Heating a gaseous refrigerant above its saturation temperature while maintaining a constant saturation pressure is called superheating. The temperature difference between the superheated gas and its saturation temperature is called the degree of superheat. Specifically, in some embodiments of this disclosure, the controller determines the degree of superheat based on the difference between the temperature of the refrigerant in the evaporator outlet pipe and the temperature of the refrigerant in the evaporator inlet pipe; the controller determines the degree of subcooling based on the difference between the temperature of the refrigerant in the first section of the pipe after being cooled by the heat exchange element and the temperature of the refrigerant in the first section of the pipe before being cooled by the heat exchange element. When the indoor unit of the air conditioner is in cooling mode, the controller adjusts the opening of the electronic expansion valve according to the degree of subcooling and superheat. When the indoor unit of the air conditioner is in heating mode, the electronic expansion valve is fully open, and no throttling is performed.

[0055] In this embodiment of the disclosure, by taking into account both the subcooling of the refrigerant before throttling and the superheat of the refrigerant after flowing through the evaporator in the cooling mode, the opening of the electronic expansion valve is precisely adjusted, which helps to further improve the cooling effect of the indoor unit of the air conditioner and enhance the user experience.

[0056] In some embodiments of this disclosure, the indoor unit of the air conditioner further includes a first temperature sensor 8, a second temperature sensor 7, and a third temperature sensor 9. The first temperature sensor 8 is disposed on the outlet pipe 6 of the evaporator 4 and is used to measure the temperature of the refrigerant in the outlet pipe of the evaporator. The second temperature sensor 7 is disposed on the inlet pipe 5 of the evaporator 4 and is used to measure the temperature of the refrigerant in the inlet pipe of the evaporator. The third temperature sensor 9 is disposed on the first section of pipe 101 and is used to measure the temperature of the refrigerant in the first pipe after it has been cooled by the heat exchange element 3.

[0057] In this embodiment of the disclosure, by setting up the above multiple temperature sensors to detect the refrigerant temperature in the pipeline, the controller can more accurately determine the subcooling and superheat based on the detected refrigerant temperature, and more accurately adjust the opening of the electronic expansion valve based on the subcooling and superheat, thereby further improving the cooling effect of the air conditioner and the user experience.

[0058] In some embodiments, the controller determines whether to adjust the opening of the electronic expansion valve based on the superheat and subcooling, including: if the absolute value of the difference between the superheat and the target superheat is greater than a superheat deviation threshold, or if the absolute value of the difference between the subcooling and the target subcooling is greater than a subcooling deviation threshold, then the controller determines to adjust the opening of the electronic expansion valve; otherwise, the controller determines not to adjust the opening of the electronic expansion valve.

[0059] In some examples, the target superheat is a value greater than 0 and less than or equal to 5 degrees Celsius, and the target subcooling is a value greater than or equal to 6 degrees Celsius and less than or equal to 20 degrees Celsius. By keeping the target superheat within these ranges, the refrigerant evaporates more completely, improving heat exchange. Similarly, by keeping the target subcooling within these ranges, the subcooling effect is improved, enhancing the cooling performance of the air conditioning system.

[0060] In some examples, the superheat deviation threshold and the supercooling deviation threshold are values ​​greater than 0 and less than or equal to 1 degree Celsius. For example, let the superheat deviation threshold and the supercooling deviation threshold both be 1.

[0061] In this embodiment of the disclosure, by setting the superheat deviation threshold and the supercooling deviation threshold to be within the above-mentioned value range, on the one hand, a better cooling effect can be achieved, and on the other hand, the frequent adjustment operations caused by fluctuations in superheat and supercooling can be alleviated, resulting in greater energy savings.

[0062] Furthermore, without affecting the implementation of this disclosure, the target superheat, target supercool, superheat deviation threshold, and supercool deviation threshold can also be set to other values, such as setting the target superheat to 6, the target supercool to 21, the superheat deviation threshold to 1, and the supercool deviation threshold to 2.

[0063] In some examples, after determining that the opening of the electronic expansion valve needs to be adjusted, the controller determines the opening adjustment method of the electronic expansion valve in the following way: based on the correspondence between the preset subcooling and superheat value ranges and the opening adjustment methods, the controller determines the opening adjustment method corresponding to the currently detected subcooling and superheat.

[0064] For example, five value ranges for superheat (A) and subcooling (B), as shown in Table 1, and the corresponding opening adjustment methods for these five value ranges are pre-set. In Table 1, A0 represents the target superheat and B0 represents the target subcooling. After the controller determines that the opening of the electronic expansion valve needs to be adjusted, it determines the opening adjustment method based on the value ranges where the currently detected superheat and subcooling fall.

[0065] Table 1

[0066]

[0067] In other examples, after determining that the opening of the electronic expansion valve needs to be adjusted, the controller determines the adjustment method of the electronic expansion valve opening in the following ways: a first adjustment method is determined based on the superheat; a second adjustment method is determined based on the subcooling; if the first and second adjustment methods are inconsistent, the adjustment method with higher priority between the first and second adjustment methods is used as the opening adjustment method of the electronic expansion valve; if the first and second adjustment methods are consistent, either the first or the second adjustment method is used as the opening adjustment method of the electronic expansion valve.

[0068] For example, when the first adjustment method is to increase the opening of the electronic expansion valve, and the second adjustment method is to decrease the opening of the electronic expansion valve, or when no adjustment of the opening of the electronic expansion valve is required, if the priority of the first adjustment method is higher than the priority of the second adjustment method, then the electronic expansion valve is increased; when the first adjustment method is to decrease the opening of the electronic expansion valve, and the second adjustment method is to increase the opening of the electronic expansion valve, if the priority of the first adjustment method is lower than the priority of the second adjustment method, then the opening of the electronic expansion valve is increased.

[0069] In this embodiment of the disclosure, when the first adjustment method and the second adjustment method are inconsistent, the opening degree of the electronic expansion valve is adjusted according to the adjustment method with higher priority among the first adjustment method and the second adjustment method. This can further improve the accuracy of the opening degree adjustment of the electronic expansion valve and better ensure the cooling effect of the air conditioner and the user experience.

[0070] In some examples, the controller determines the first and second adjustment modes of the electronic expansion valve as follows: when the absolute value of the difference between the superheat and the target superheat is greater than the superheat deviation threshold and the superheat is less than the target superheat, the first adjustment mode is to decrease the opening of the electronic expansion valve; when the absolute value of the difference between the superheat and the target superheat is greater than the superheat deviation threshold and the superheat is greater than the target superheat, the first adjustment mode is to increase the opening of the electronic expansion valve; when the absolute value of the difference between the subcooling and the target subcooling is greater than the subcooling deviation threshold and the subcooling is less than the target subcooling, the second adjustment mode is to increase the opening of the electronic expansion valve; when the absolute value of the difference between the subcooling and the target subcooling is greater than the subcooling deviation threshold and the subcooling is greater than the target subcooling, the second adjustment mode is to decrease the opening of the electronic expansion valve.

[0071] In some examples, the priority of the first and second adjustment methods satisfies the following condition: when the superheat is greater than or equal to 1 and less than the target superheat, and the subcooling is less than the target subcooling, the priority of the second adjustment method is higher than that of the first adjustment method. In this case, if the first adjustment method is to decrease the opening of the electronic expansion valve or keep the opening of the electronic expansion valve unchanged, and the second adjustment method is to increase the opening of the electronic expansion valve, then the final determined opening adjustment method is to increase the opening of the electronic expansion valve.

[0072] In some examples, the priority of the first and second adjustment methods satisfies the following condition: when the superheat is less than 1 and less than the target superheat, and the subcooling is less than the target subcooling, the first adjustment method has a higher priority than the second adjustment method. In this case, if the first adjustment method is to decrease the opening of the electronic expansion valve, and the second adjustment method is to increase the opening of the electronic expansion valve or keep the opening of the electronic expansion valve unchanged, then the final determined opening adjustment method is to decrease the opening of the electronic expansion valve.

[0073] In some examples, the priority of the first and second adjustment methods is satisfied: when the superheat is greater than the target superheat and the subcooling is greater than the target subcooling, the first adjustment method has a higher priority than the second adjustment method. In this case, if the first adjustment method is to increase the opening of the electronic expansion valve and the second adjustment method is to decrease the opening of the electronic expansion valve, then the final determined opening adjustment method is to increase the opening of the electronic expansion valve.

[0074] In this embodiment of the disclosure, by setting the priority of the first adjustment mode and the second adjustment mode according to the values ​​of superheat and subcooling, the rationality of setting the priority of the adjustment mode can be improved, thereby further improving the accuracy of the opening adjustment of the electronic expansion valve and better ensuring the cooling effect of the air conditioner and the user experience.

[0075] In this embodiment of the disclosure, the above-described air conditioner indoor unit can increase the subcooling of the refrigerant before it enters the indoor unit for throttling, with the addition of a few or no additional components, while saving space and cost for the indoor unit. Furthermore, by adjusting the opening of the throttling element according to the superheat, the cooling effect of the air conditioner and the user experience can be better guaranteed.

[0076] Figure 2 This is a schematic diagram of the structure of a heat exchange element according to some embodiments of the present disclosure. Figure 2 In the illustrated embodiment, heat exchange element 3 is a shell-and-tube heat exchanger. For example... Figure 2 As shown, the heat exchange element 3 is installed in the first section of pipe 101 and the second section of pipe 102, located after the throttling element 2. When the refrigerant in the first section of pipe 101 flows through the heat exchange element 3, it undergoes subcooling heat exchange with the throttled refrigerant in the second section of pipe 102, thereby reducing the temperature of the refrigerant entering the indoor unit before throttling. This increases the subcooling of the refrigerant, effectively mitigating the liquid flow noise generated when the gas-liquid two-phase refrigerant flows through the throttling element 2, and improving the user experience.

[0077] Figure 3 This is a schematic diagram of the structure of a heat exchange element according to other embodiments of this disclosure. Figure 3 In the illustrated embodiment, heat exchange element 3 is a tube-wound heat exchanger. For example... Figure 3 As shown, the heat exchange element 3 is disposed on the first section of pipe 101 and wound around the second section of pipe 102, located after the throttling element 2. When the refrigerant in the first section of pipe 101 flows through the heat exchange element 3, it undergoes subcooling heat exchange with the throttled refrigerant in the second section of pipe 102, thereby reducing the temperature of the refrigerant entering the indoor unit before throttling. This increases the subcooling of the refrigerant, effectively mitigating the liquid flow noise generated when the gas-liquid two-phase refrigerant flows through the throttling element 2, and improving the user experience.

[0078] Figure 4 This is a flowchart illustrating a control method according to some embodiments of the present disclosure. In some embodiments, the control method is applied to an indoor air conditioning unit as described above. Figure 4 As shown, the control method includes steps S410 to S440.

[0079] In step S410, the superheat is determined based on the temperature of the refrigerant in the outlet pipe of the evaporator and the temperature of the refrigerant in the inlet pipe of the evaporator.

[0080] In some examples, the controller receives the temperature of the refrigerant in the evaporator outlet pipe from a first temperature sensor and the temperature of the refrigerant in the evaporator inlet pipe from a second temperature sensor; the superheat is determined based on the difference between the temperature of the refrigerant in the evaporator outlet pipe and the temperature of the refrigerant in the evaporator inlet pipe.

[0081] In this embodiment of the disclosure, the superheat can be determined more accurately through the above method, which helps to improve the accuracy of the electronic expansion valve opening adjustment, thereby better improving the cooling effect and the user experience.

[0082] In step S420, the subcooling is determined based on the temperature of the refrigerant in the first section of the pipeline after being cooled by the heat exchange element and the temperature of the refrigerant in the first section of the pipeline before being cooled by the heat exchange element.

[0083] In some examples, the controller receives the temperature of the refrigerant after it has been cooled by the heat exchange element in the first section of the pipeline from a third temperature sensor; it measures the saturation pressure of the refrigerant before subcooling based on the pressure sensor in the outdoor unit, determines the saturation temperature of the refrigerant before subcooling based on the saturation pressure, and uses this as the temperature of the refrigerant before it has been cooled by the heat exchange element in the first section of the pipeline; and it determines the degree of subcooling based on the difference between the temperature of the cooled refrigerant and the temperature of the refrigerant before cooling.

[0084] In this embodiment, the subcooling can be determined more accurately using the above method, which helps to improve the accuracy of the electronic expansion valve's opening adjustment, thereby improving the cooling effect and user experience. Furthermore, by determining the refrigerant temperature before cooling based on the saturation pressure measured by the pressure sensor in the outdoor unit, there is no need to add a temperature sensor in the indoor unit to measure the refrigerant temperature before cooling, further saving space and cost for the indoor unit.

[0085] In step S430, in cooling mode, it is determined whether to adjust the opening degree of the throttling element based on the superheat and subcooling.

[0086] In some embodiments of this disclosure, the throttling element is an electronic expansion valve.

[0087] In some examples, the superheat is compared with the target superheat, and the subcooling is compared with the target subcooling. Based on the comparison results, it is determined whether to adjust the opening of the electronic expansion valve.

[0088] In step S440, after determining that the opening degree of the throttling element is to be adjusted, the indication information of the adjustment mode of the opening degree of the throttling element is output.

[0089] For example, after determining that the opening of the throttling element should be adjusted, a first adjustment command is output to the throttling element. The first adjustment command carries the indication information of the opening adjustment method: the indication information of increasing the opening of the throttling element.

[0090] For example, after determining that the opening of the throttling element should be adjusted, a second adjustment command is output to the throttling element. The second adjustment command carries the indication information of the opening adjustment method: the indication information of reducing the opening of the throttling element.

[0091] In this embodiment of the disclosure, a self-subcooling piping system based on a first section of piping, a second section of piping, and a heat exchange element, as described above, is installed in the indoor unit of the air conditioner, and then... Figure 4 The control method shown adjusts the opening of the throttling element, which can increase the subcooling of the refrigerant before it enters the indoor unit by adding fewer elements or no elements at all. This effectively alleviates the liquid flow noise problem caused by the two-phase refrigerant flowing through the throttling element of the indoor unit, improves the cooling effect of the air conditioner and the user experience. At the same time, the design of the above-mentioned self-subcooling pipeline system saves space and cost of the indoor unit.

[0092] Figure 5 This is a flowchart illustrating a control method according to other embodiments of the present disclosure. In embodiments of the present disclosure, the control method is applied to an indoor air conditioning unit as described above. Figure 5 As shown, the control method includes steps S510 to S550.

[0093] In step S510, the current operating mode of the air conditioner is determined.

[0094] In some examples, it is executed by the controller. Figure 5 The control method shown.

[0095] In some examples, the controller acquires the air conditioner's operating mode. This operating mode includes both cooling and heating modes.

[0096] When the air conditioner is in cooling mode, execute step S520; when the air conditioner is in heating mode, execute step S530.

[0097] In step S520, the superheat A and the subcooling B are determined.

[0098] In some examples, the controller determines the superheat A based on the temperature of the refrigerant in the evaporator outlet pipe and the temperature of the refrigerant in the evaporator inlet pipe; and determines the subcooling B based on the temperature of the refrigerant in the first section of the pipe after being cooled by the heat exchange element and the temperature of the refrigerant in the first section of the pipe before being cooled by the heat exchange element.

[0099] In step S530, the process ends.

[0100] In some examples, when the air conditioner is operating in heating mode, the electronic expansion valve is fully open. The electronic expansion valve is a specific example of a throttling element 2 located on the second section of the piping.

[0101] In step S540, it is determined whether |A-A0| is greater than a or whether |B-B0| is greater than b.

[0102] Where A0 is the target superheat, B0 is the target supercool, a is the superheat deviation threshold, and b is the supercool deviation threshold.

[0103] In some examples, the target superheat is a value greater than 0 and less than or equal to 5 degrees Celsius, and the target subcooling is a value greater than or equal to 6 degrees Celsius and less than or equal to 20 degrees Celsius. By keeping the target superheat within these ranges, the refrigerant evaporates more completely, improving heat exchange. Similarly, by keeping the target subcooling within these ranges, the subcooling effect is improved, enhancing the cooling performance of the air conditioning system.

[0104] In some examples, the superheat deviation threshold and the supercooling deviation threshold are values ​​greater than 0 and less than or equal to 1 degree Celsius. For example, let the superheat deviation threshold and the supercooling deviation threshold both be 1.

[0105] In this embodiment of the disclosure, by setting the superheat deviation threshold and the supercooling deviation threshold to be within the above-mentioned value range, on the one hand, a better cooling effect can be achieved, and on the other hand, the frequent adjustment operations caused by fluctuations in superheat and supercooling can be alleviated, resulting in greater energy savings.

[0106] If the result of step S540 is yes, proceed to step S550; otherwise, proceed to step S560.

[0107] In step S550, the electronic expansion valve is adjusted.

[0108] In some examples, the electronic expansion valve is adjusted as follows: based on the correspondence between the preset subcooling and superheating value ranges and the opening adjustment methods, the opening adjustment method corresponding to the subcooling and superheating determined in step S520 is determined.

[0109] For example, the correspondence between the value ranges of subcooling and superheat as shown in Table 1 and the opening adjustment method can be preset. Assuming that the superheat A is 1 and B is 1, and A0 is 3 and B0 is 7, determined by step S520, then the subcooling and superheat fall within the first value range in Table 1, and therefore the opening of the electronic expansion valve is increased.

[0110] In some examples, the electronic expansion valve is adjusted as follows: a first adjustment method is determined based on the superheat; a second adjustment method is determined based on the subcooling; when the first and second adjustment methods are inconsistent, the adjustment method with higher priority is used as the opening adjustment method of the electronic expansion valve; when the first and second adjustment methods are consistent, either the first or the second adjustment method is used as the opening adjustment method of the electronic expansion valve.

[0111] For example, when the first adjustment method is to increase the opening of the electronic expansion valve, and the second adjustment method is to decrease the opening of the electronic expansion valve, or when no adjustment of the opening of the electronic expansion valve is required, if the priority of the first adjustment method is higher than the priority of the second adjustment method, then the electronic expansion valve is increased; when the first adjustment method is to decrease the opening of the electronic expansion valve, and the second adjustment method is to increase the opening of the electronic expansion valve, if the priority of the first adjustment method is lower than the priority of the second adjustment method, then the opening of the electronic expansion valve is increased.

[0112] In this embodiment of the disclosure, when the first adjustment method and the second adjustment method are inconsistent, the opening degree of the electronic expansion valve is adjusted according to the adjustment method with higher priority among the first adjustment method and the second adjustment method. This can further improve the accuracy of the opening degree adjustment of the electronic expansion valve and better ensure the cooling effect of the air conditioner and the user experience.

[0113] In some examples, determining the first and second adjustment methods of the electronic expansion valve includes: when the absolute value of the difference between the superheat and the target superheat is greater than the superheat deviation threshold and the superheat is less than the target superheat, the first adjustment method is to decrease the opening of the electronic expansion valve; when the absolute value of the difference between the superheat and the target superheat is greater than the superheat deviation threshold and the superheat is greater than the target superheat, the first adjustment method is to increase the opening of the electronic expansion valve; when the absolute value of the difference between the subcooling and the target subcooling is greater than the subcooling deviation threshold and the subcooling is less than the target subcooling, the second adjustment method is to increase the opening of the electronic expansion valve; when the absolute value of the difference between the subcooling and the target subcooling is greater than the subcooling deviation threshold and the subcooling is greater than the target subcooling, the second adjustment method is to decrease the opening of the electronic expansion valve.

[0114] In some examples, the priority of the first and second adjustment methods satisfies the following condition: when the superheat is greater than or equal to 1 and less than the target superheat, and the subcooling is less than the target subcooling, the priority of the second adjustment method is higher than that of the first adjustment method. In this case, if the first adjustment method is to decrease the opening of the electronic expansion valve or keep the opening of the electronic expansion valve unchanged, and the second adjustment method is to increase the opening of the electronic expansion valve, then the final determined opening adjustment method is to increase the opening of the electronic expansion valve.

[0115] In some examples, the priority of the first and second adjustment methods satisfies the following condition: when the superheat is less than 1 and less than the target superheat, and the subcooling is less than the target subcooling, the first adjustment method has a higher priority than the second adjustment method. In this case, if the first adjustment method is to decrease the opening of the electronic expansion valve, and the second adjustment method is to increase the opening of the electronic expansion valve or keep the opening of the electronic expansion valve unchanged, then the final determined opening adjustment method is to decrease the opening of the electronic expansion valve.

[0116] In some examples, the priority of the first and second adjustment methods is satisfied: when the superheat is greater than the target superheat and the subcooling is greater than the target subcooling, the first adjustment method has a higher priority than the second adjustment method. In this case, if the first adjustment method is to increase the opening of the electronic expansion valve and the second adjustment method is to decrease the opening of the electronic expansion valve, then the final determined opening adjustment method is to increase the opening of the electronic expansion valve.

[0117] In this embodiment of the disclosure, by setting the priority of the first adjustment mode and the second adjustment mode according to the values ​​of superheat and subcooling, the rationality of setting the priority of the adjustment mode can be improved, thereby further improving the accuracy of the opening adjustment of the electronic expansion valve and better ensuring the cooling effect of the air conditioner and the user experience.

[0118] In step S560, the electronic expansion valve is not adjusted.

[0119] In this embodiment of the disclosure, a self-subcooling piping system based on a first section of piping, a second section of piping, and a heat exchange element, as described above, is installed in the indoor unit of the air conditioner, and then... Figure 5 The control method shown allows for more precise adjustment of the opening of the electronic expansion valve located before the evaporator, which can further improve the cooling effect of the air conditioner and the user experience.

[0120] Figure 6 This is a schematic diagram of the structure of a controller according to some embodiments of the present disclosure. Figure 6 As shown, the controller 600 is applied to the air conditioner indoor unit as described above, and includes a first determining module 610, a second determining module 620, a judging module 630, and an adjusting module 640.

[0121] The first determining module 610 is configured to determine the superheat based on the temperature of the refrigerant in the outlet pipe of the evaporator and the temperature of the refrigerant in the inlet pipe of the evaporator.

[0122] In some examples, the first determining module 610 is configured to: receive the temperature of the refrigerant in the outlet pipe of the evaporator from a first temperature sensor, and receive the temperature of the refrigerant in the inlet pipe of the evaporator from a second temperature sensor; and determine the superheat based on the difference between the temperature of the refrigerant in the outlet pipe of the evaporator and the temperature of the refrigerant in the inlet pipe of the evaporator.

[0123] In this embodiment of the disclosure, the superheat can be determined more accurately through the above method, which helps to improve the accuracy of the electronic expansion valve opening adjustment, thereby better improving the cooling effect and the user experience.

[0124] The second determining module 620 is configured to determine the subcooling based on the temperature of the refrigerant in the first pipeline after being cooled by the heat exchange element and the temperature of the refrigerant in the first pipeline before being cooled by the heat exchange element.

[0125] In some examples, the second determining module 620 is configured to: receive the temperature of the refrigerant in the first section of the pipeline after cooling by the heat exchange element from the third temperature sensor; measure the saturation pressure of the refrigerant before subcooling according to the pressure sensor in the outdoor unit, determine the saturation temperature of the refrigerant before subcooling according to the saturation pressure, and use it as the temperature of the refrigerant in the first section of the pipeline before cooling by the heat exchange element; and determine the degree of subcooling according to the difference between the temperature of the cooled refrigerant and the temperature of the refrigerant before cooling.

[0126] In this embodiment, the subcooling can be determined more accurately using the above method, which helps to improve the accuracy of the electronic expansion valve's opening adjustment, thereby improving the cooling effect and user experience. Furthermore, by determining the refrigerant temperature before cooling based on the saturation pressure measured by the pressure sensor in the outdoor unit, there is no need to add a temperature sensor in the indoor unit to measure the refrigerant temperature before cooling, further saving space and cost for the indoor unit.

[0127] The judgment module 630 is configured to determine, in cooling mode, whether to adjust the opening of the throttling element based on the superheat and subcooling.

[0128] In some examples, the throttling element is an electronic expansion valve.

[0129] In some examples, the determination module 630 is configured to: determine whether the absolute value of the difference between the superheat and the target superheat is greater than the superheat deviation threshold, or whether the absolute value of the difference between the subcooling and the target subcooling is greater than the subcooling deviation threshold; if yes, determine to adjust the opening of the electronic expansion valve; otherwise, determine not to adjust the opening of the electronic expansion valve.

[0130] The adjustment module 640 is configured to output indication information of the adjustment method of the throttling element after determining that the opening degree of the throttling element is to be adjusted.

[0131] In some examples, the adjustment module 640 is also configured to determine the opening adjustment method of the throttling element in the following manner: based on the correspondence between the preset value ranges of subcooling and superheating and the opening adjustment method, determine the opening adjustment method corresponding to the subcooling and superheating determined by the first determination module and the second determination module.

[0132] For example, the correspondence between the value ranges of subcooling and superheat as shown in Table 1 and the opening adjustment method can be preset. Assuming that the superheat A is 1 and B is 1 determined by the first determining module and the second determining module, and A0 is 3 and B0 is 7, then the subcooling and superheat fall within the first value range in Table 1, and therefore the opening of the electronic expansion valve is increased.

[0133] In some examples, the regulating module 640 is also configured to determine the opening regulation method of the throttling element in the following manner: determining a first regulation method of the throttling element based on the superheat; determining a second regulation method of the throttling element based on the subcooling; when the first regulation method and the second regulation method are inconsistent, using the regulation method with higher priority between the first regulation method and the second regulation method as the opening regulation method of the throttling element; when the first regulation method and the second regulation method are consistent, using either the first regulation method or the second regulation method as the opening regulation method of the throttling element.

[0134] For example, when the first adjustment method is to increase the opening of the electronic expansion valve, and the second adjustment method is to decrease the opening of the electronic expansion valve, or when no adjustment of the opening of the electronic expansion valve is required, if the priority of the first adjustment method is higher than the priority of the second adjustment method, then the electronic expansion valve is increased; when the first adjustment method is to decrease the opening of the electronic expansion valve, and the second adjustment method is to increase the opening of the electronic expansion valve, if the priority of the first adjustment method is lower than the priority of the second adjustment method, then the opening of the electronic expansion valve is increased.

[0135] In this embodiment of the disclosure, when the first adjustment method and the second adjustment method are inconsistent, the opening degree of the throttling element is adjusted according to the adjustment method with higher priority among the first and second adjustment methods. This can further improve the accuracy of the opening degree adjustment of the throttling element and better ensure the cooling effect of the air conditioner and the user experience.

[0136] In this embodiment of the disclosure, by setting up a self-cooling piping system based on the first section of piping, the second section of piping, and the heat exchange element in the indoor unit of the air conditioner, as described above, and by using the controller to more precisely adjust the opening of the throttling element (e.g., electronic expansion valve) located before the evaporator, the cooling effect of the air conditioner and the user experience can be further improved.

[0137] Figure 7 This is a schematic diagram of the structure of a controller according to other embodiments of this disclosure. For example... Figure 7 As shown, the controller 700 includes a memory 710 and a processor 720 coupled to the memory 710. The memory 710 is used to store instructions for executing control methods corresponding to embodiments thereof. The processor 720 is configured to execute control methods in any of the embodiments of this disclosure based on the instructions stored in the memory 710.

[0138] Figure 8 This is a schematic diagram of the structure of an air conditioning system according to some embodiments of the present disclosure. Figure 8 As shown, the air conditioning system 800 includes an indoor air conditioning unit 810.

[0139] In some embodiments, the indoor unit 810 of the air conditioner includes a liquid pipe, a throttling element, a heat exchange element, and an evaporator. The liquid pipe includes a first section and a second section. One end of the second section is connected to the first section, and the other end is connected to the inlet pipe of the evaporator. The throttling element, disposed on the second section, is configured to throttle the refrigerant flowing from the first section into the second section. The heat exchange element is configured to exchange heat between the throttled refrigerant in the second section and the refrigerant in the first section.

[0140] In some examples, the throttling element is an electronic expansion valve.

[0141] In some embodiments, the indoor unit 810 of the air conditioner further includes a controller and a plurality of temperature sensors. The controller is configured to adjust the opening of the electronic expansion valve according to the control method described above.

[0142] Multiple temperature sensors, including such Figure 1 The first, second, and third temperature sensors shown are used to measure the temperature of the refrigerant at multiple measurement points, so that the controller can determine the superheat and subcooling, and then adjust the opening of the electronic expansion valve according to the superheat and subcooling.

[0143] In this embodiment, the air conditioning system described above can increase the subcooling of the refrigerant before it enters the indoor unit by adding a few components or without adding any components, while saving space and cost for the indoor unit. Furthermore, by adjusting the opening of the throttling element based on the superheat, the cooling effect of the air conditioner and the user experience can be better guaranteed.

[0144] Various aspects of this disclosure are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus, and computer program products according to embodiments of this disclosure. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations thereof, can be implemented by computer-readable program instructions.

[0145] These computer-readable program instructions are provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable device to produce a machine, such that execution of the instructions by the processor produces means for implementing the functions specified in one or more boxes of the flowchart and / or block diagram.

[0146] These computer-readable program instructions may also be stored in a computer-readable storage medium. These instructions cause a computer to work in a particular manner to produce an article of manufacture, including instructions that implement the functions specified in one or more boxes in a flowchart and / or block diagram.

[0147] This disclosure may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects.

[0148] The above embodiments provide an air conditioning indoor unit, control method, controller, and air conditioning system that can increase the subcooling of the refrigerant before it enters the indoor unit by adding a few components or without adding any components, thereby improving the cooling effect and user experience, while saving space and cost of the indoor unit.

[0149] The air conditioning indoor unit, control method, controller, and air conditioning system according to this disclosure have been described in detail above. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.

Claims

1. An indoor unit for an air conditioner, comprising: The liquid pipe includes a first section of pipe and a second section of pipe. One end of the second section of pipe is connected to the first section of pipe, and the other end is connected to the inlet pipe of the evaporator. A throttling element, disposed on the second section of the pipeline, is configured to throttle the refrigerant flowing from the first section of the pipeline into the second section of the pipeline; the throttling element is an electronic expansion valve. The heat exchange element is configured to exchange heat between the refrigerant throttled in the second section of the pipeline and the refrigerant in the first section of the pipeline; The controller is configured to: determine the superheat based on the temperature of the refrigerant in the outlet pipe of the evaporator and the temperature of the refrigerant in the inlet pipe of the evaporator; determine the subcooling based on the temperature of the refrigerant in the first section of the pipe after being cooled by the heat exchange element and the temperature of the refrigerant in the first section of the pipe before being cooled by the heat exchange element; in cooling mode, determine whether to adjust the opening of the electronic expansion valve based on the superheat and the subcooling; and after determining to adjust the opening of the electronic expansion valve, output indication information of the opening adjustment mode of the electronic expansion valve. The controller is further configured to: determine a first adjustment mode of the electronic expansion valve based on the superheat; determine a second adjustment mode of the electronic expansion valve based on the subcooling; and when the first adjustment mode and the second adjustment mode are inconsistent, use the adjustment mode with higher priority between the first adjustment mode and the second adjustment mode as the opening adjustment mode of the electronic expansion valve. When the first adjustment method and the second adjustment method are consistent, the first adjustment method or the second adjustment method shall be used as the opening adjustment method of the electronic expansion valve.

2. The indoor unit of the air conditioner according to claim 1, wherein, The heat exchange element includes: A plate heat exchanger or a tubular heat exchanger is installed in the second section of the pipeline after throttling by the throttling element, and also on the first section of the pipeline; or... A heat sink is disposed between the portion of the second section of the pipe after it has been throttled by the throttling element and the first section of the pipe; or... The thermal adhesive is applied to the portion of the second section of the pipeline after it has been throttled by the throttling element, and to the portion of the second section of the pipeline after it has been throttled by the throttling element, which is either close to or wrapped around the first section of the pipeline.

3. The indoor unit of the air conditioner according to claim 1, wherein, The controller determines whether to adjust the opening of the electronic expansion valve based on the superheat and the subcooling, including: If the absolute value of the difference between the superheat and the target superheat is greater than the superheat deviation threshold, or if the absolute value of the difference between the subcooling and the target subcooling is greater than the subcooling deviation threshold, it is determined that the opening of the electronic expansion valve shall be adjusted; otherwise, it is determined that the opening of the electronic expansion valve shall not be adjusted.

4. The indoor unit of the air conditioner according to claim 3, wherein, The priority of the first adjustment method and the second adjustment method is satisfied as follows: When the superheat is greater than or equal to 1 and less than the target superheat, and the subcooling is less than the target subcooling, the second adjustment method has a higher priority than the first adjustment method. When the superheat is less than 1 and less than the target superheat, and the subcooling is less than the target subcooling, the first adjustment method has a higher priority than the second adjustment method. When the superheat is greater than the target superheat and the subcooling is greater than the target subcooling, the first adjustment method has a higher priority than the second adjustment method.

5. The indoor unit of the air conditioner according to any one of claims 1 to 4, wherein: The step of determining the first adjustment mode of the electronic expansion valve based on the superheat includes: When the absolute value of the difference between the superheat and the target superheat is greater than the superheat deviation threshold and the superheat is less than the target superheat, the first adjustment method is to reduce the opening of the electronic expansion valve. If the absolute value of the difference between the superheat and the target superheat is greater than the superheat deviation threshold and the superheat is greater than the target superheat, the first adjustment method is to increase the opening of the electronic expansion valve. The step of determining the second adjustment method of the electronic expansion valve based on the subcooling degree includes: When the absolute value of the difference between the subcooling degree and the target subcooling degree is greater than the subcooling degree deviation threshold and the subcooling degree is less than the target subcooling degree, the second adjustment method is to increase the opening of the electronic expansion valve. If the absolute value of the difference between the subcooling degree and the target subcooling degree is greater than the subcooling degree deviation threshold, and the subcooling degree is greater than the target subcooling degree, the second adjustment method is to reduce the opening of the electronic expansion valve.

6. The indoor unit of the air conditioner according to claim 3, wherein, The target superheat is a value greater than 0 and less than or equal to 5 degrees Celsius, and the target supercooling is a value greater than or equal to 6 degrees Celsius and less than or equal to 20 degrees Celsius.

7. The indoor unit of the air conditioner according to claim 3, wherein, The superheat deviation threshold and the supercooling deviation threshold are values ​​greater than 0 and less than or equal to 1 degree Celsius.

8. The indoor unit of the air conditioner according to claim 1, further comprising: The first temperature sensor is installed on the outlet pipe of the evaporator to measure the temperature of the refrigerant in the outlet pipe of the evaporator. The second temperature sensor is installed on the inlet pipe of the evaporator and is used to measure the temperature of the refrigerant in the inlet pipe of the evaporator. The third temperature sensor is installed on the first section of the pipeline and is used to measure the temperature of the refrigerant in the first section of the pipeline after it has been cooled by the heat exchange element.

9. A control method applied to an indoor air conditioning unit according to any one of claims 1 to 8, comprising: The superheat is determined based on the temperature of the refrigerant in the outlet pipe of the evaporator and the temperature of the refrigerant in the inlet pipe of the evaporator. The degree of subcooling is determined based on the temperature of the refrigerant in the first section of the pipeline after being cooled by the heat exchange element and the temperature of the refrigerant in the first section of the pipeline before being cooled by the heat exchange element. In cooling mode, based on the superheat and the subcooling, it is determined whether to adjust the opening of the throttling element; After determining that the opening degree of the throttling element should be adjusted, an indication message of the adjustment method of the opening degree of the throttling element is output. The opening adjustment method of the electronic expansion valve is determined as follows: a first adjustment method of the electronic expansion valve is determined based on the superheat; a second adjustment method of the electronic expansion valve is determined based on the subcooling; when the first adjustment method and the second adjustment method are inconsistent, the adjustment method with higher priority between the first adjustment method and the second adjustment method is used as the opening adjustment method of the electronic expansion valve. When the first adjustment method and the second adjustment method are consistent, the first adjustment method or the second adjustment method shall be used as the opening adjustment method of the electronic expansion valve.

10. A controller applied to an indoor air conditioning unit according to any one of claims 1 or 8, comprising: The first determining module is configured to determine the superheat based on the temperature of the refrigerant in the outlet pipe of the evaporator and the temperature of the refrigerant in the inlet pipe of the evaporator; The second determining module is configured to determine the subcooling degree based on the temperature of the refrigerant in the first section of the pipeline after being cooled by the heat exchange element and the temperature of the refrigerant in the first section of the pipeline before being cooled by the heat exchange element. The judgment module is configured to determine, in cooling mode, whether to adjust the opening of the throttling element based on the superheat and the subcooling. The adjustment module is configured to output indication information of the adjustment mode of the throttling element after determining that the opening degree of the throttling element is to be adjusted; The adjustment module is further configured to: determine a first adjustment mode of the electronic expansion valve based on the superheat. Based on the subcooling, a second adjustment mode for the electronic expansion valve is determined; when the first adjustment mode and the second adjustment mode are inconsistent, the adjustment mode with higher priority between the first adjustment mode and the second adjustment mode is used as the opening adjustment mode for the electronic expansion valve. When the first adjustment method and the second adjustment method are consistent, the first adjustment method or the second adjustment method shall be used as the opening adjustment method of the electronic expansion valve.

11. An air conditioning system, comprising: The air conditioning indoor unit according to any one of claims 1 to 8, or the controller according to claim 10.

12. A controller, comprising: Memory; as well as A processor coupled to the memory, the processor being configured to execute the control method of claim 9 based on instructions stored in the memory.

13. A computer-readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the control method of claim 9.

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