Air conditioner unit evaporator branch line pipe diameter determination system and method, and air conditioner

Abstract

The application relates to the technical field of air conditioners, and particularly provides a branch pipeline diameter determination system and method for an air conditioner unit evaporator and an air conditioner, aiming to solve the problem that different outlet temperatures exist due to uneven air volume distribution of an existing air conditioner with multiple evaporators in parallel. To this end, the branch pipeline diameter determination method comprises the following steps: controlling the operation of the air conditioner unit; obtaining the temperature values of the air outlet ends of the evaporators; adjusting the opening degrees of the control valves according to the temperature values; when the temperature values of the air outlet ends of the evaporators are within a preset temperature difference range, recording the final opening degree values of the control valves; and determining the actual diameters of the branch pipelines according to the final opening degree values. In the production and manufacturing process of the air conditioner, the diameters of the branch pipelines are determined according to the above method, so that the uniformity of the air outlet gas temperature corresponding to each evaporator can be improved, the user experience can be improved, and the production cost and the complexity of the air conditioner structure can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and specifically provides a system and method for determining the pipe diameter of a branch pipe of an air conditioner unit evaporator, and an air conditioner. BACKGROUND

[0002] With the continuous development of air conditioning technology, air conditioners with multiple evaporators in parallel have entered the market. An air conditioner with multiple evaporators in parallel refers to an indoor unit of the air conditioner including multiple evaporators, the multiple evaporators being connected in parallel with a compressor through a branch pipe, and air being blown to each evaporator by a fan to form air outlets at different positions.

[0003] In the above air conditioning system with multiple evaporators in parallel, the air volume of an evaporator with a certain heat exchange area directly affects the temperature difference at the refrigerant outlet. In actual research and development design of the air conditioner, the actual air field distribution inside the air conditioner is affected by the internal structure of the air conditioner and the layout of the air supply system, and there is a deviation in different degrees, which will cause differences in the air volume received by each evaporator. The air volume difference will cause a significant difference in the temperature of the refrigerant outlet of different evaporators, and thus the temperature of the air outlets corresponding to different evaporators will also be different, which will greatly reduce the user experience.

[0004] Correspondingly, there is a need in the art for a new technical solution to solve the above problems. SUMMARY

[0005] The present application aims to solve the above technical problems, i.e., to solve the problem of differences in the temperature of different air outlets caused by uneven air distribution in the existing air conditioner with multiple evaporators in parallel.

[0006] In a first aspect, the present application provides a system for determining the pipe diameter of a branch pipe of an air conditioner unit evaporator, which comprises:

[0007] a plurality of preset branch pipes, one end of each of the plurality of preset branch pipes being connected to a main pipe and the other end being connected to a liquid inlet end of each of the evaporators, the pipe diameters of the plurality of preset branch pipes being the same;

[0008] a plurality of control valves, each of the plurality of control valves being arranged on the preset branch pipes;

[0009] a temperature detection module arranged at a gas outlet end of each of the evaporators, the temperature detection module being configured to detect the temperature at the gas outlet end of each of the evaporators; and

[0010] a controller configured to adjust the opening degree of each of the control valves according to the detection value of the temperature detection module.

[0011] Optionally, the control valve is an electronic expansion valve.

[0012] In a second aspect, the application provides a method for determining the diameter of branch pipes of an air conditioning unit evaporator, which is based on a branch pipe diameter determination system, the branch pipe diameter determination system comprising:

[0013] a plurality of preset branch pipes, one end of each of which is connected to the main pipe and the other end of each of which is connected to the liquid inlet end of each of the evaporators, the diameters of the plurality of preset branch pipes being the same;

[0014] a plurality of control valves, each of which is connected to the preset branch pipe;

[0015] a temperature detection module, which is arranged at the air outlet end of each of the evaporators and is used to detect the temperature of the air outlet end of each of the evaporators; and

[0016] a controller, which adjusts the opening degree of each of the control valves according to the detection value of the temperature detection module.

[0017] The method for determining the diameter of branch pipes comprises:

[0018] controlling the air conditioning unit to operate;

[0019] obtaining the temperature value of the air outlet end of each of the evaporators;

[0020] adjusting the opening degree of each of the control valves according to the temperature value;

[0021] when the difference between the temperature values of the air outlet ends of the evaporators is within a preset temperature difference range, recording the final opening degree value of each of the control valves;

[0022] determining the actual diameter of each of the branch pipes according to the final opening degree value.

[0023] Optionally, the step of “adjusting the opening degree of each of the control valves according to the temperature value” specifically comprises:

[0024] when the air conditioning unit operates in a cooling mode, increasing the opening degree of the control valve when the temperature value is greater than a target temperature value; and / or

[0025] decreasing the opening degree of the control valve when the temperature value is less than the target temperature value.

[0026] Optionally, the step of “adjusting the opening degree of each of the control valves according to the temperature value” specifically comprises:

[0027] when the air conditioning unit operates in a heating mode, decreasing the opening degree of the control valve when the temperature value is greater than a target temperature value; and / or

[0028] increasing the opening degree of the control valve when the temperature value is less than the target temperature value.

[0029] The branch pipe diameter determination method further comprises, after the step of controlling the operation of the air conditioning unit and before the step of obtaining the temperature value of the outlet end of each evaporator:

[0030] adjusting the air volume of the air conditioning unit to a target air volume, adjusting the opening degree of each control valve to the same opening degree, and operating for a preset time length.

[0031] The step of adjusting the opening degree of each control valve to the same opening degree specifically comprises:

[0032] adjusting the opening degree of each control valve to the maximum opening degree.

[0033] Optionally, the step of determining the actual pipe diameter of each branch pipe according to the final opening degree value specifically comprises:

[0034] determining the ratio of the cross-sectional areas of the branch pipes according to the ratio of the final opening degree values of the control valves;

[0035] calculating the actual pipe diameter of the branch pipes according to the ratio of the cross-sectional areas of the branch pipes.

[0036] In a third aspect, the present application provides an air conditioner, comprising an air conditioner indoor unit, wherein the air conditioner indoor unit comprises:

[0037] a plurality of evaporators;

[0038] a main pipe in communication with a compressor of the air conditioner;

[0039] a plurality of branch pipes, one end of each branch pipe being in communication with the main pipe and the other end being in communication with the evaporator, the pipe diameters of the branch pipes being different, and the pipe diameters of the branch pipes being determined according to the branch pipe diameter determination method of any one of the second aspect.

[0040] Optionally, a capillary tube group is further arranged between the branch pipes and the evaporators.

[0041] As described above, in the case of adopting the above technical solution, the pipe diameter values of the branch pipes of the air conditioner with multiple evaporators in parallel are determined in the above manner, which can retain the original design structure of the air conditioner, i.e., without the need to redevelop and design the internal structure and air supply system of the air conditioner, and re-arrange the air supply system for different air supply systems, so as to ensure that the air conditioner can be mass-produced, improve the universality of the air conditioner product, and thus greatly improve its market competitiveness on the premise of improving the user experience.

[0042] On the other hand, when the air conditioner is manufactured in the manner of the present application, the pipe diameter of the branch pipe is determined according to the layout of the air conditioner indoor unit air supply system, and the branch pipe with different pipe diameters is connected between the evaporator and the compressor of the air conditioner, which not only improves the uniformity of the gas temperature at the corresponding air outlet position of each evaporator and improves the user experience, but most importantly, the air conditioner manufactured in the manner of the present application does not need to set other control valves and control components in the air conditioner indoor unit, thereby reducing the production cost of the air conditioner and the complexity of the internal structure of the air conditioner. BRIEF DESCRIPTION OF DRAWINGS

[0043] The preferred embodiments of the present application will be described below with reference to the accompanying drawings, in which:

[0044] Figure 1 is a schematic diagram of the branch pipe diameter determination system of the evaporator of the air conditioner unit given by the embodiments of the present application;

[0045] Figure 2 is a main step flowchart of the branch pipe diameter determination method of the evaporator of the air conditioner unit given by the embodiments of the present application.

[0046] Figure 3 is a detailed step flowchart of the branch pipe diameter determination method of the evaporator of the air conditioner unit given by the embodiments of the present application.

[0047] In the drawings, the reference signs refer to the following:

[0048] 1, preset branch pipe; 100, main pipe; 2, control valve; 200, evaporator. DETAILED DESCRIPTION

[0049] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not used to limit the protection scope of the present application. Those skilled in the art can make adjustments as needed to adapt to specific application occasions.

[0050] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the related devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the ordinal numbers "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0051] In addition, it needs to be explained that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] The air conditioner with multiple evaporators in parallel is affected by the structure of the air conditioner and the layout of the air supply system, resulting in different air volumes received by different evaporators. Under the premise of different air volumes, the temperature of the air outlet corresponding to different evaporators is also affected. For example, when the air conditioner is running in cooling mode, under the premise that the refrigerant flow in each evaporator is the same, when the air volume received by one side of the evaporator is smaller, it will lead to insufficient evaporation of the refrigerant, and then the outlet temperature of the refrigerant is lower. Correspondingly, when the air volume received by the evaporator is larger, it will lead to more sufficient evaporation of the refrigerant, and then the outlet temperature of the refrigerant is higher, which will directly affect the temperature of the air outlet on both sides and reduce the user experience.

[0053] In order to improve the above problems, in some related technologies, electronic expansion valves are arranged on the branch pipes of each evaporator, and temperature sensors are arranged at the gas outlets of the evaporators, i.e. the refrigerant outlets. The opening degree of each electronic expansion valve is adjusted according to the temperature of the gas outlet of different evaporators to control the refrigerant flow. However, this method will increase the production cost of the air conditioner, increase the complexity of the air conditioning system and the power consumption. In some other related technologies, the structure or internal air supply system of the air conditioner is changed to improve the consistency of the air volume on different sides. However, this method redesigns the structure of the air conditioner, increases the new parts inside the air conditioner and changes the layout between the parts, which greatly reduces the universality of the air conditioner. Not only does it complicate the research and design and production process, but it also increases the manufacturing cost.

[0054] Therefore, the above methods all have great disadvantages. Therefore, in the production and manufacturing process of the air conditioner, the pipe diameter of the branch pipe connected to each evaporator is designed, and the pipe diameter of different branch pipes is calculated according to the distribution of the air volume, so as to control the flow of the refrigerant entering different evaporators through the difference in pipe diameter, and improve the uniformity of the air outlet.

[0055] Reference Figure 1 A branch pipe diameter determination system for an air conditioner unit evaporator is disclosed in the present application (two evaporators are taken as an example for illustration), which comprises a preset branch pipe 1, a control valve 2, a temperature detection module (not shown in the figure) and a controller (not shown in the figure). It needs to be explained that the number of preset branch pipes 1 and control valves 2 is the same as the number of evaporators.

[0056] Each preset branch pipe 1 is arranged in parallel, one end of which is communicated with the main pipe 100, and the other end of which is communicated with the liquid inlet end of the evaporator 200, and the pipe diameters of the plurality of preset branch pipes 1 are the same. It should be understood that the preset branch pipe 1 is not a component of the final air conditioner product, but an auxiliary structure for determining the pipe diameter of the branch pipe.

[0057] The control valve 2 is arranged in the corresponding preset branch pipe 1 in communication, and functions to adjust the opening degree to control the refrigerant flow of the preset branch pipe 1. Optionally, the control valve 2 can be an electronic expansion valve.

[0058] The temperature detection module is arranged at the gas outlet end of the evaporator 200, and is used to detect the temperature at the gas outlet end of each evaporator 200. It should be noted that in the branch pipe diameter determination system of the present application, when the evaporator 200 is provided with a capillary tube group, a temperature detection point can be arranged for each capillary tube, or a temperature detection point can be arranged at the total gas outlet of the evaporator 200, and the present application does not make a specific limitation thereon.

[0059] The controller functions to adjust the opening degree of each control valve 2 according to the detection value of the temperature detection module, so as to change the refrigerant flow of each evaporator 200.

[0060] With reference to Figure 2 and Figure 3 , the present application further discloses a method for determining the pipe diameter of the branch pipe of the evaporator of an air conditioning unit, which adopts the branch pipe diameter determination system of the evaporator of the air conditioning unit in the above embodiment, and comprises the following steps:

[0061] S101: Control the air conditioning unit to run.

[0062] The air conditioning unit is taken as an example in the embodiment of the present application to run in a refrigeration mode. It should be noted that the premise of step S101 is that after the main components of the air conditioner are initially processed and manufactured, the preset branch pipe 1 and the control valve 2 are connected between the compressor and each evaporator, and the temperature sensor, the controller and other components are also connected in the air conditioning unit, so as to form a closed loop.

[0063] S102: Adjust the air volume of the air conditioning unit to a target air volume, adjust the opening degree of each control valve 2 to the same opening degree, and run for a preset time length.

[0064] It should be noted that the above target air volume refers to a preset air volume value, for example, the fan of the indoor unit of the air conditioner runs at a certain power, and the air volume value generated by the fan at this power value is taken as the target air volume. The specific value of the target air volume can be determined according to actual needs. The opening degree of each control valve 2 is adjusted to the same opening degree in order to make the refrigerant flow in each evaporator the same in the initial running state, and then adjusted according to the temperature of the evaporator outlet in the later period. The specific value of the above preset time length is determined according to actual experience, for example, the preset time length is 1-2 hours. The purpose of running for the preset time length is to make the air conditioning unit in a stable running state and ensure that a stable air field has been formed inside.

[0065] In an implementation manner of the present application, in step S103, the opening degree of each control valve 2 can be adjusted to the maximum opening degree.

[0066] S103: Obtain the temperature value of the outlet of each evaporator.

[0067] After the air conditioning unit runs stably for the preset time length, the temperature values of each monitoring point are monitored in real time by the temperature detection module.

[0068] S104: Adjust the opening degree of each control valve 2 according to the temperature value.

[0069] Specifically, step S104 includes:

[0070] S1041: When the temperature value is greater than the target temperature value, increase the opening degree of the control valve 2.

[0071] The above target temperature value refers to a desired standard temperature in the production design of the air conditioner, for example, when the air conditioning unit runs in the cooling mode, the cooling temperature of the air conditioner is set to 26 degrees, and the target temperature value can be considered as 26 degrees. Assuming Figure 1 If the temperature of the left evaporator outlet is greater than the target temperature value, it means that the air volume on this side is relatively large, and the refrigerant flow on this side is relatively small, and the refrigerant is fully evaporated, so the refrigerant is in a superheated state. At this time, the opening degree of the control valve 2 should be controlled to increase the refrigerant flow on this side and reduce the temperature value on this side.

[0072] S1042: When the temperature value is less than the target temperature value, decrease the opening degree of the control valve 2.

[0073] Similarly, if Figure 1 If the temperature of the right evaporator outlet is less than the target temperature value, it means that the air volume on this side is relatively small, and the refrigerant flow on this side is relatively large, and the refrigerant is in an insufficiently evaporated state, so the refrigerant is in a low-temperature state. At this time, the opening degree of the control valve 2 should be controlled to reduce the refrigerant flow on this side and increase the temperature value on this side.

[0074] It should be noted that, in addition to the above-mentioned target temperature value as a criterion, the temperature difference between the two evaporators 2 can also be used as a criterion in the adjustment process of each control valve 2, and the temperature difference between the two evaporators 2 is reduced as the final goal.

[0075] It should be understood that, although the air conditioning unit is taken as an example in the refrigeration mode in the present application, this does not constitute a limitation of the present application. For example, if the air conditioning unit is operated in the heating mode, the detection is performed, and then step S1041 should be: when the temperature value is greater than the target temperature value, the opening degree of the control valve 2 is controlled to be reduced in the state that the air conditioning unit is operated in the heating mode. Step S1042 should be: when the temperature value is less than the target temperature value, the opening degree of the control valve 2 is controlled to be increased. The above-mentioned specific steps are obtained according to the refrigeration and heating principles of the air conditioner, and the present application will not be repeated here.

[0076] It should be noted that, in step S104, the adjustment of the opening degree of each control valve 2 can be adjusted in different stages according to the size of the temperature difference, and each stage is adjusted in a pulse mode. For example, in the initial adjustment stage, the temperature difference between the two evaporator outlet temperatures is large, and then the opening degree of the control valve 2 is gradually increased or decreased according to the pulse number of 25 pls, and when the temperature difference between the two evaporator outlet temperatures is small, it indicates that the temperature values tend to be consistent, and then the opening degree of the control valve 2 is gradually increased or decreased according to the pulse number of 5 pls for fine adjustment.

[0077] S105: When the temperature difference between the outlet temperatures of each evaporator is within the preset temperature difference range, the final opening degree value of each control valve 2 is recorded.

[0078] After the opening degree of each control valve 2 is adjusted by step S104, the temperature of each evaporator outlet tends to be consistent, and then it is indicated that the temperature of each air outlet corresponding to the evaporator tends to be consistent, and the final opening degree value of each control valve 2 is recorded.

[0079] In step S105, the preset temperature difference can be determined according to actual needs, for example, the preset temperature difference is ±0.5 degrees. In theory, the smaller the value of the preset temperature difference, the higher the adjustment accuracy, and the better the temperature uniformity of the air outlets corresponding to different evaporators.

[0080] S106: The actual pipe diameter of each branch pipe is determined according to the final opening degree value. The actual pipe diameter is the pipe diameter of the branch pipe corresponding to the final air conditioning product.

[0081] In a possible implementation manner of the present application, step S106 can specifically include the following steps:

[0082] S1061: The ratio of the cross-sectional areas of each branch pipe is determined according to the ratio of the final opening degree values of each control valve 2.

[0083] S1062: calculating the actual pipe diameter of the branch pipe according to the ratio of the cross-sectional areas of the branch pipes.

[0084] It can be understood that the opening size of the control valve 2 determines the refrigerant flow in the evaporator, and the final opening value of the control valve 2 is the opening size, so it also reflects the pipe diameter of the branch pipe. The ratio of the final opening value of each control valve 2 is taken as the ratio of the cross-sectional area of each corresponding branch pipe, and then the actual pipe diameter of the branch pipe is calculated through the cross-sectional area, so as to realize qualitative calculation.

[0085] Of course, in some other implementations, the specific implementation of step S106 can also be obtained by, for example, numerical simulation, to further improve the accuracy, and the specific way is not limited in the application.

[0086] The technical scheme is adopted in the application. In the production and manufacturing process of the air conditioner, when each component part is processed, a corresponding preset branch pipe is connected between each evaporator and the main pipe at the output end of the compressor, a control valve is arranged on the preset branch pipe, and then a temperature detection module, a controller and other necessary components are built to form a complete loop system. Based on the system, simulation is carried out. Specifically, during the trial operation of the air conditioning unit, the opening of each control valve is adjusted according to the detection value of the temperature detection module, so that the temperature value of the gas outlet end of each evaporator tends to be consistent, and finally the pipe diameter value of the actual branch pipe corresponding to each evaporator is calculated through the final opening value of each control valve.

[0087] Because in the actual production and processing of the air conditioner, the layout of the internal air supply system of different products is different, so that the air volume received by each evaporator in each air conditioner is not completely the same. Therefore, by adopting this way to determine the pipe diameter value of the branch pipe of the air conditioner with multiple evaporators in parallel, the original design structure of the air conditioner can be retained, that is, it is not necessary to redevelop and design the internal structure and air supply system of the air conditioner, and it is not necessary to re-layout for different air supply systems, so as to ensure that the air conditioner can be mass-produced, improve the universality of the air conditioner product, and further improve the market competitiveness of the air conditioner on the premise of improving the user experience.

[0088] The application also discloses an air conditioner, which comprises an air conditioner indoor unit and a compressor, a throttling valve, a condenser and other necessary components. The air conditioner indoor unit comprises a main pipe, a plurality of branch pipes and a plurality of evaporators. The main pipe is communicated with the compressor of the air conditioner, and the throttling valve is arranged on the main pipe. The branch pipes are arranged in parallel between the main pipe and the evaporators, one end of the branch pipe is communicated with the main pipe, and the other end is communicated with the evaporator.

[0089] Specifically, the pipe diameter of each branch pipe is determined according to the pipe diameter determination method in any of the above embodiments. The pipe diameters of different branch pipes are determined according to the layout of the air conditioner indoor unit air supply system, and the branch pipes with different pipe diameters are connected between the evaporators and the compressor of the air conditioner. This not only improves the uniformity of the gas temperature at the positions of the air outlets corresponding to the evaporators and improves the user experience, but most importantly, the air conditioner product manufactured according to the present application does not need to be provided with other control valves and control components in the air conditioner indoor unit, thereby reducing the production cost of the air conditioner and the complexity of the internal structure of the air conditioner.

[0090] As a possible implementation manner of the present application, a capillary group is further arranged in communication between the branch pipe and the evaporator.

[0091] After the pipe diameters of the air conditioner are determined according to the pipe diameter determination method in the above embodiments, the specific number of capillaries in the capillary group is adjusted to adjust the refrigerant flow of the evaporator, so as to realize further fine adjustment of the refrigerant flow and further improve the uniformity of the gas temperature at the air outlets corresponding to the evaporators.

[0092] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will all fall within the protection scope of the present application.

Claims

1. A system for determining the diameter of branch pipes of an air conditioning unit evaporator, characterized in that, The air conditioning unit evaporator branch pipe diameter determination system comprises: a plurality of preset branch pipes, one end of each of which is connected to a main pipe, and the other end of each of which is connected to a liquid inlet end of each of the evaporators, the diameters of the plurality of preset branch pipes being the same; a plurality of control valves, each of which is arranged in communication with a preset branch pipe; a temperature detection module arranged at a gas outlet end of each of the evaporators, and configured to detect a temperature of the gas outlet end of each of the evaporators; and a controller configured to adjust an opening degree of each of the control valves according to a detection value of the temperature detection module. The air conditioning unit evaporator branch pipe diameter determination system comprises a branch pipe diameter determination method, and the branch pipe diameter determination method comprises: controlling the air conditioning unit to operate; adjusting an air volume of the air conditioning unit to a target air volume, adjusting the opening degree of each of the control valves to a same opening degree, and operating for a preset time length; obtaining a temperature value of a gas outlet end of each of the evaporators; adjusting the opening degree of each of the control valves according to the temperature value; when a difference between the temperature values of the gas outlet ends of the evaporators is within a preset temperature difference range, recording a final opening degree value of each of the control valves; determining an actual diameter of each of the branch pipes according to the final opening degree value. The step of "adjusting the opening degree of each of the control valves according to the temperature value" specifically comprises: when the air conditioning unit operates in a cooling mode, increasing the opening degree of the control valve when the temperature value is greater than a target temperature value; and decreasing the opening degree of the control valve when the temperature value is less than the target temperature value. The control valve is an electronic expansion valve.

2. The branch line sizing system of claim 1, wherein, The branch pipe diameter determination method is based on a branch pipe diameter determination system, and the branch pipe diameter determination system comprises:

3. A method for determining the size of a branch line of an air conditioning unit evaporator, comprising the steps of: a plurality of preset branch pipes, one end of each of which is connected to a main pipe, and the other end of each of which is connected to a liquid inlet end of each of the evaporators, the diameters of the plurality of preset branch pipes being the same; a plurality of control valves, each of which is arranged in communication with a preset branch pipe; a temperature detection module arranged at a gas outlet end of each of the evaporators, and configured to detect a temperature of the gas outlet end of each of the evaporators; and a controller configured to adjust an opening degree of each of the control valves according to a detection value of the temperature detection module. The branch pipe diameter determination method comprises: controlling the air conditioning unit to operate; adjusting an air volume of the air conditioning unit to a target air volume, adjusting the opening degree of each of the control valves to a same opening degree, and operating for a preset time length; obtaining a temperature value of a gas outlet end of each of the evaporators; adjusting the opening degree of each of the control valves according to the temperature value; when a difference between the temperature values of the gas outlet ends of the evaporators is within a preset temperature difference range, recording a final opening degree value of each of the control valves; determining an actual diameter of each of the branch pipes according to the final opening degree value. The step of "adjusting the opening degree of each of the control valves according to the temperature value" specifically comprises: when the air conditioning unit operates in a cooling mode, increasing the opening degree of the control valve when the temperature value is greater than a target temperature value; and decreasing the opening degree of the control valve when the temperature value is less than the target temperature value. The step of "adjusting the opening degree of each of the control valves according to the temperature value" further comprises:

4. The branch line diameter determination method according to claim 3, characterized by, ​ In the state that the air conditioning unit operates in the heating mode, when the temperature value is greater than a target temperature value, the opening degree of the control valve is controlled to decrease; When the temperature value is less than the target temperature value, the opening degree of the control valve is controlled to increase.

5. The branch line diameter determination method according to claim 3, characterized by, The step of "adjusting the opening degree of each control valve to the same opening degree" specifically comprises: Adjusting the opening degree of each control valve to the maximum opening degree.

6. The branch line diameter determination method according to claim 3, characterized by, The step of "determining the actual pipe diameter of each branch pipe according to the final opening degree value" specifically comprises: Determining the ratio of the cross-sectional area of each branch pipe according to the ratio of the final opening degree value of each control valve; Calculating the actual pipe diameter of the branch pipe according to the ratio of the cross-sectional area of the branch pipe.

7. An air conditioner comprising an air conditioner indoor unit, characterized by comprising: The indoor unit of the air conditioner comprises: A plurality of evaporators; A main pipe in communication with the compressor of the air conditioner; A plurality of branch pipes, one end of each of which is in communication with the main pipe and the other end of each of which is in communication with the evaporator, the pipe diameter of each branch pipe being different, and the pipe diameter of each branch pipe being determined according to the branch pipe diameter determination method of any one of claims 3 to 6.

8. The air conditioner of claim 7, wherein A capillary tube group is further arranged in communication between the branch pipe and the evaporator.

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