Air inlet structure of heat exchanger and air conditioning unit

Abstract

The utility model discloses a heat exchanger air inlet structure and an air conditioning unit, and the heat exchanger air inlet structure comprises a heat exchanger, which is provided with at least two heat exchange tube groups, each heat exchange tube group is independently provided with an air collecting tube; the flow equalizing box is provided with a header pipe used for allowing fluid to flow in and out of the flow equalizing box and flow equalizing pipes in one-to-one correspondence with the gas collecting pipes, the gas collecting pipes are connected to the flow equalizing box through the corresponding flow equalizing pipes, and each flow equalizing pipe is provided with a control valve used for adjusting flow; an inner cavity of the flow equalizing box is divided into a first functional area and a second functional area by a pressure equalizing plate with pressure equalizing holes, the flow equalizing pipe is arranged in the first functional area, and the header pipe is arranged in the second functional area. Each heat exchange tube group of the heat exchanger is connected to the flow equalizing box through the flow equalizing tube, and the control valves mounted on the flow equalizing tubes are used for adjusting the flow of refrigerants sent to the heat exchange tube groups, so that the refrigerants are flexibly distributed, and the operation performance of an air conditioning system is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to an air inlet structure of a heat exchanger and an air conditioner unit capable of adjusting the uniformity of refrigerant distribution. Background Art

[0002] In an air conditioning system, a heat exchanger is one of the core components, and its performance directly affects the efficiency and stability of the entire air conditioning system. Especially for a system adopting a design of multiple groups of heat exchange tubes, the reasonable distribution of refrigerant is particularly important. During the operation of the air conditioning system, the air volume in the edge areas such as the bottom of the heat exchanger is small, and the refrigerant flowing into the heat exchange tubes in this part is difficult to be effectively heat-exchanged. Moreover, under the action of gravity, the refrigerant flow at the bottom of the heat exchanger is relatively large. These problems have a particularly prominent impact on refrigeration and defrosting, resulting in a decline in the performance of the air conditioning system.

[0003] Taking defrosting as an example, due to the poor heat exchange of the heat exchange tubes in the low-air-volume areas such as the bottom of the heat exchanger, frosting is most serious in most cases. During the defrosting process, more refrigerant needs to flow into the heat exchange tubes in this part to shorten the defrosting time. The traditional air conditioning system does not distinguish between the heat exchange tube groups at different positions, and the high-temperature refrigerant discharged from the compressor is sent to the entire heat exchanger. In this case, the heat exchange tubes with slight frosting have been defrosted clean, but a large amount of high-temperature refrigerant is still supplied for defrosting, and this part of the heat is wasted. While the heat exchanger with serious frosting has not been completely defrosted. Due to the certain refrigerant flow, the refrigerant continues to bypass to the heat exchange tubes that have been defrosted clean, and the heat exchange tubes that have not been completely defrosted cannot obtain more refrigerant, resulting in a slow defrosting speed and affecting the heating comfort.

[0004] Therefore, how to design an air inlet structure of a heat exchanger and an air conditioner unit capable of adjusting the uniformity of refrigerant distribution is a technical problem urgently to be solved in the industry. Summary of the Utility Model

[0005] In order to solve the defect of uneven refrigerant distribution in the prior art, the utility model provides an air inlet structure of a heat exchanger and an air conditioner unit capable of adjusting the uniformity of refrigerant distribution. Each heat exchange tube group is connected to a flow equalizing box through a flow equalizing tube, and a control valve installed on the flow equalizing tube is used to adjust the refrigerant flow rate sent to the heat exchange tube group, realizing flexible distribution of the refrigerant and significantly improving the operation performance of the air conditioning system.

[0006] The technical solution adopted by the utility model is to design an air inlet structure of a heat exchanger, including:

[0007] A heat exchanger having at least two heat exchange tube groups, and each heat exchange tube group is separately configured with a gas collecting pipe;

[0008] The flow equalizing box is provided with a main pipe for the fluid to enter and exit the flow equalizing box, and flow equalizing pipes corresponding to the gas collecting pipes one by one. The gas collecting pipes are connected to the flow equalizing box through the corresponding flow equalizing pipes, and a control valve for adjusting the flow rate is installed on each flow equalizing pipe.

[0009] Furthermore, the inner cavity of the flow equalizing box is divided into a first functional area and a second functional area by a flow equalizing plate distributed with pressure equalizing holes. The flow equalizing pipes are arranged in the first functional area, and the main pipe is arranged in the second functional area.

[0010] Furthermore, the heat exchanger has at least two heat exchange tube groups arranged vertically, and the flow equalizing pipes are arranged at the top of the first functional area.

[0011] Furthermore, a flared opening is provided at the end of the flow equalizing pipe connected to the flow equalizing box, and the flared opening opens towards the inner cavity of the flow equalizing box.

[0012] Furthermore, the cross-sectional area of the flow equalizing box is more than 3 times larger than the cross-sectional area of the main pipe.

[0013] Furthermore, the main pipe extends into the flow equalizing box from the outside to form an extended section, and the opening of the extended section is higher than the inner bottom surface of the flow equalizing box.

[0014] Furthermore, the heat exchanger intake structure further includes: a diverter. One end of each heat exchange tube group is connected to its corresponding gas collecting pipe, and the other ends of all heat exchange tube groups are connected to the diverter.

[0015] The present utility model also proposes an air conditioning unit, including: a compressor, an outdoor heat exchanger, a throttling element, and an indoor heat exchanger. The outdoor heat exchanger and / or the indoor heat exchanger adopt the above-mentioned heat exchanger intake structure.

[0016] In some embodiments, the outdoor heat exchanger adopts the heat exchanger intake structure, and the main pipe is connected to the exhaust side of the compressor when the air conditioning unit is in the refrigeration state or the defrosting state.

[0017] Furthermore, the air conditioning unit further includes: a four-way valve for switching the refrigerant flow direction. The main pipe is connected to the suction side of the compressor when the air conditioning unit is in the heating state.

[0018] Compared with the prior art, the present utility model has at least one of the following beneficial effects:

[0019] 1. The collecting pipes of each heat exchange tube group are connected to the flow equalizing box through the corresponding flow equalizing pipes, and the control valves installed on the flow equalizing pipes are used to adjust the refrigerant flow rate sent to the heat exchange tube group, realizing flexible distribution of the refrigerant and significantly improving the operating performance of the air conditioning system;

[0020] 2. The inner cavity of the flow equalizing box is divided into two functional areas by the flow equalizing plate, and the pressure equalizing holes on the flow equalizing plate can effectively disperse and evenly distribute the fluid pressure entering the flow equalizing box, avoiding the situation of too high or too low local pressure and ensuring that the fluid flows at a stable flow rate and direction;

[0021] 3. The main pipe extends into the flow equalizing box from the outside to form an extension section. The opening of the extension section is higher than the inner bottom surface of the flow equalizing box. In the application scenario where the outdoor heat exchanger uses a flow equalizing box, when heating, a part of the refrigerant that has not been completely evaporated in the outdoor heat exchanger will enter the flow equalizing box in a liquid form. At this time, it will deposit at the bottom of the flow equalizing box and will not be directly carried out, reducing the risk of liquid slugging of the compressor. Description of the Drawings

[0022] The present utility model will be described in detail below in conjunction with embodiments and drawings, where:

[0023] Figure 1 is a schematic diagram of the air intake structure of some embodiments of the present utility model;

[0024] Figure 2 is a schematic diagram of the inside of the flow equalizing box of some embodiments of the present utility model;

[0025] Figure 3 is a schematic diagram of the refrigerant flow direction in the refrigeration state / defrosting state of the present utility model;

[0026] Figure 4 is a schematic diagram of the refrigerant flow direction in the heating state of the present utility model;

[0027] Figure 5 is a schematic diagram of the outdoor unit of the air conditioner unit of some embodiments of the present utility model;

[0028] Description of the Drawings: 1. Heat exchanger; 11. Heat exchange tube group; 11a. Upper heat exchange tube group; 11b. Lower heat exchange tube group; 12. Collector pipe; 12a. Upper collector pipe; 12b. Lower collector pipe; 2. Flow equalizing box; 21. Main pipe; 22. Flow equalizing pipe; 22a. Upper flow equalizing pipe; 22b. Lower flow equalizing pipe; 221. Bell mouth; 23. Control valve; 23a. Upper control valve; 23b. Lower control valve; 24. Flow equalizing plate; 241. Flow equalizing hole; 1a. Outdoor heat exchanger; 3. Flow divider; 4. Compressor; 5. Throttling element; 6. Four-way valve; 7. Defrosting temperature sensor; 7a. Upper defrosting temperature sensor; 7b. Lower defrosting temperature sensor. Detailed Embodiments

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0030] As Figure 1As shown in the figure, the air inlet structure of the heat exchanger proposed by the present utility model includes: a heat exchanger 1 and a flow equalizing box 2. The heat exchanger 1 has at least two heat exchange tube groups 11. Each heat exchange tube group 11 is separately provided with a gas collecting pipe 12. The flow equalizing box 2 is provided with a main pipe 21 and a plurality of flow equalizing pipes 22. The number of the flow equalizing pipes 22 is the same as that of the gas collecting pipes 12, and the flow equalizing pipes 22 and the gas collecting pipes 12 are in one-to-one correspondence. The gas collecting pipe 12 is connected to the flow equalizing box 2 through the corresponding flow equalizing pipe 22. A control valve 23 for regulating the flow rate is installed on each flow equalizing pipe 22.

[0031] The advantage of this design is that the control valve 23 installed on the flow equalizing pipe 22 can be used to adjust the refrigerant flow rate sent to the heat exchange tube group 11, realizing flexible distribution of the refrigerant. In actual application, the heat exchanger 1 can be zone-controlled according to the operation requirements, significantly improving the operation performance of the air conditioning system.

[0032] It should be understood that the control valve 23 includes, but is not limited to, electric ball valves, electronic collision law and other electric valve parts with flow regulation functions.

[0033] As Figure 2 shown, in some embodiments of the present utility model, the inner cavity of the flow equalizing box 2 is separated into two functional areas by a flow equalizing plate 24, namely a first functional area 25 and a second functional area 26. The flow equalizing pipes 22 are arranged in the first functional area 25, and the main pipe 21 is arranged in the second functional area 26. The flow equalizing plate 24 is evenly distributed with pressure equalizing holes. The fluid entering one functional area needs to pass through the pressure equalizing holes 241 on the flow equalizing plate 24 to reach the other functional area, effectively dispersing and evenly distributing the fluid pressure by using the pressure equalizing holes 241 to ensure that the fluid flows at a stable flow rate and flow direction.

[0034] As Figure 3 shown, taking the intake of the main pipe 21 as an example, when the fluid (such as gas or liquid) enters the second functional area 26 through the main pipe 21, due to the existence of the flow equalizing plate 24, the fluid will pass through the pressure equalizing holes 241 and be evenly distributed to the first functional area 25, avoiding the situation of too high or too low local pressure, making the fluid in the first functional area 25 maintain a uniform flow state, and then orderly entering the flow equalizing pipes 22.

[0035] In some embodiments of the present utility model, the heat exchanger 1 has at least two heat exchange tube groups 11 arranged vertically. The heat exchange tubes in the heat exchange tube group 11 are horizontally arranged. The inner cavity of the flow equalizing box 2 is separated into upper and lower two functional areas by a flow equalizing plate. The first functional area 25 is located above the second functional area 26, and the flow equalizing pipes 22 are arranged at the top of the first functional area 25.

[0036] For the heat exchange tube groups arranged vertically, when the high-temperature refrigerant discharged by the compressor is sent to the entire heat exchanger without distinguishing the heat exchange tube groups at different positions, the refrigerant will concentrate and flow towards the heat exchange tube group located at the bottom of the heat exchanger under the action of gravity, resulting in refrigerant deviation. However, in the present utility model, by designing the flow equalizing tube 22 at the top of the first functional area 25, when the flow equalizing box 2 is used to distribute the intake air, the refrigerant in the first functional area 25 can flow relatively evenly to each flow equalizing tube 22, and will not concentrate and flow towards the flow equalizing tube 22 with a lower position due to the action of gravity. The refrigerant deviation phenomenon is significantly improved, effectively enhancing the overall heat exchange effect of the heat exchanger.

[0037] It should be understood that dividing the flow equalizing box 2 into upper and lower functional areas is to enable the fluid to flow through the functional areas successively from top to bottom or from bottom to top. The flow resistance of the fluid in the vertical direction is relatively small. This sequential flow mode simplifies the fluid management process, and the overall layout of the flow equalizing box 2 is more reasonable. In actual application, dividing the flow equalizing box 2 into left and right functional areas can also achieve the flow equalizing effect, and the distribution position of the functional areas can be designed according to specific requirements.

[0038] As Figure 2 shown, in some embodiments of the present utility model, the end of the flow equalizing tube 22 connected to the flow equalizing box is provided with a flared opening 221, and the flared opening 221 opens towards the inner cavity of the flow equalizing box 2. The design of the flared opening 221 can guide the fluid to flow into the flow equalizing tube 22 more smoothly, reduce the turbulence and eddy current phenomena of the fluid at the inlet, reduce the energy loss when the fluid enters the flow equalizing tube 22, and improve the fluid distribution efficiency.

[0039] It should be noted that the shape of the flow equalizing box 2 can be square, rectangular or cylindrical. To ensure the flow equalizing effect, the internal space of the flow equalizing box 2 must be large enough. The preferred solution is that the cross-sectional area of the flow equalizing box 2 is more than 3 times the cross-sectional area of the main pipe 21. Since the cross-sectional area of the flow equalizing box 2 is much larger than the cross-sectional area of the main pipe 21, the fluid will quickly diffuse after entering the flow equalizing box 2, and the flow velocity will be significantly reduced, which helps to reduce the turbulence and eddy current phenomena of the fluid during the flow process and makes the fluid flow more smoothly. Moreover, a larger cross-sectional area means that the fluid has more space for diffusion and mixing, making it easier to achieve uniform distribution of the fluid.

[0040] As Figure 2 shown, in some embodiments of the present utility model, the main pipe 21 extends into the flow equalizing box 2 from the outside to form an extended section, and the opening of the extended section is higher than the inner bottom surface of the flow equalizing box 2. The area in the inner cavity of the flow equalizing box 2 below the opening of the extended section can be used for liquid storage. As Figure 4As shown, in the application scenario where the outdoor heat exchanger 1a adopts the flow equalizing box 2, when heating, a part of the refrigerant that has not been completely evaporated in the outdoor heat exchanger 1a will enter the flow equalizing box 2 in liquid form. At this time, it will deposit at the bottom of the flow equalizing box 2 and will not be directly carried out, reducing the risk of liquid slugging of the compressor 4.

[0041] As Figure 1 shown, in the case where the heat exchanger 1 has multiple heat exchange tube groups, a flow divider 3 can also be designed. One end of each heat exchange tube group 11 is connected to its corresponding header pipe 12, and the other ends of all heat exchange tube groups 11 are connected to the flow divider 3. By designing the flow equalizing box 2 at one end of the heat exchanger 1 and the flow divider 3 at the other end, the fluid can be relatively evenly distributed before entering each heat exchange tube group 11 in different flow directions. Since the fluid flow rate obtained by each heat exchange tube is basically the same, the heat exchange area of each heat exchange tube can be fully utilized, avoiding the decrease in heat exchange efficiency caused by uneven fluid distribution.

[0042] As Figure 1 、 2 、5 shown, the present utility model also proposes an air conditioning unit, including: a compressor 4, an outdoor heat exchanger 1a, a throttling element 5, and an indoor heat exchanger. The outdoor heat exchanger 1a and / or the indoor heat exchanger adopt the above-mentioned heat exchanger air intake structure. Each heat exchange tube group 11 of the heat exchanger 1 is connected to the flow equalizing box 2 through a corresponding flow equalizing pipe 22. The refrigerant flow rate sent to the heat exchange tube group 11 is adjusted by the control valve 23 installed on the flow equalizing pipe 22, realizing flexible distribution of the refrigerant and significantly improving the operating performance of the air conditioning unit.

[0043] In some embodiments of the present utility model, the outdoor heat exchanger 1a adopts the heat exchanger air intake structure, and the main pipe 21 is connected to the exhaust side of the compressor 4 when the air conditioning unit is in the refrigeration state. In the refrigeration state or the defrosting state, the high-temperature refrigerant discharged by the compressor 4 enters the second functional area 26 of the flow equalizing box 2 through the main pipe 21, passes through the flow equalizing plate 24 and enters the first functional area 25. The refrigerant in the first functional area 25 maintains a uniform flow state, so as to facilitate the stable and orderly entry of the refrigerant into the flow equalizing pipe 22, realizing more uniform distribution of the refrigerant during refrigeration and preventing uneven flow.

[0044] As Figures 3 to 5As shown, in some embodiments of the present utility model, the air-conditioning unit further includes: a four-way valve 6 for switching the refrigerant flow direction, and the main pipe 21 is connected to the suction side of the compressor 4 when the air-conditioning unit is in the heating state. Specifically, in the refrigeration state or the defrosting state, the high-temperature and high-pressure refrigerant gas discharged from the compressor 4 enters the four-way valve 6 and then flows through the four-way valve 6 to the flow equalizing box 2. The flow equalizing box 2 distributes the refrigerant to the outdoor heat exchanger 1a, and the refrigerant flowing out of the outdoor heat exchanger 1a is sent out through the flow divider 3. In the heating state, the high-temperature and high-pressure refrigerant gas discharged from the compressor 4 enters the four-way valve 6 and then flows through the four-way valve 6 to the indoor heat exchanger. The refrigerant flowing out of the indoor heat exchanger enters the flow divider 3 after throttling and other treatments. The flow divider 3 sends the refrigerant to the outdoor heat exchanger 1a, and the refrigerant flowing out of the outdoor heat exchanger 1a is sent out through the flow equalizing box 2.

[0045] The air-conditioning unit can operate in the refrigeration state, the defrosting state or the heating state, perform zoning control on the heat exchanger according to the operation requirements, and adjust the refrigerant flow rate sent to the heat exchange tube group by using the control valve installed on the flow equalizing pipe, so as to improve the operation efficiency of the air-conditioning unit in different states.

[0046] For the sake of easy understanding, a detailed description will be given below with an application example of the present utility model.

[0047] As Figure 1 shown, the outdoor heat exchanger 1a has two heat exchange tube groups 11 arranged vertically, namely the upper heat exchange tube group 11a and the lower heat exchange tube group 11b. The number of heat exchange tubes in the upper heat exchange tube group 11a is more than that in the lower heat exchange tube group 11b. The upper heat exchange tube group 11a is configured with an upper header 12a, an upper flow equalizing pipe 22a and an upper control valve 23a, and the lower heat exchange tube group 11b is configured with a lower header 12b, a lower flow equalizing pipe 22b and a lower control valve 23b. One end of the outdoor heat exchanger 1a is provided with a flow divider 3, and the other end is provided with a flow equalizing box 2. The flow divider 3 is connected between the throttling element 5 and the outdoor heat exchanger 1a, and the flow equalizing box 2 is connected between the four-way valve 6 and the outdoor heat exchanger 1a and is connected to the exhaust side or the suction side of the compressor 4 through the four-way valve 6. A defrosting temperature sensor 7 is installed at the bottom of each heat exchange tube group 11, and the defrosting temperature sensor 7 is installed on the side close to the flow divider 3.

[0048] In the refrigeration state or the heating state, the controller of the air-conditioning unit collects the operation parameters and calculates the starting load ratio C = Qk / Qw, where Qk is the sum of the capacities of the indoor units that have been started, and Qw is the total capacity of the outdoor unit. The heat exchange tube group 11 to be enabled is selected according to the starting operation load ratio C. If the starting operation load is relatively low - C < the set load ratio C1, only the upper heat exchange tube group 11a needs to be enabled (the upper air volume is large and the heat exchange effect is good), and the control valve 23a of the upper flow equalizing pipe 22a is opened. If the starting operation load ratio is relatively high - C ≥ the set load ratio C1, both the upper heat exchange tube group 11a and the lower heat exchange tube group 11b are enabled.

[0049] In the defrosting state, the controller of the air conditioner unit receives the temperature value TS1 detected by the upper defrosting temperature sensor 7a and the temperature value TS2 detected by the lower defrosting temperature sensor 7b, calculates the temperature difference between the upper and lower defrosting temperature sensors 7 = |TS1 - TS2|, and determines whether there is a flow deviation based on the temperature difference. There are the following two cases:

[0050] First, the temperature difference is relatively small - |TS1 - TS2| < set temperature T. First, perform flow deviation adjustment. Determine whether TS1 > TS2. If so, it means that the temperature of the upper heat exchange tube group 11a is higher, and the opening of the upper control valve 23a needs to be reduced to reduce the refrigerant flow rate of the upper heat exchange tube group 11a. If not, it means that the temperature of the lower heat exchange tube group 11b is higher, and the opening of the lower control valve 23b needs to be reduced to reduce the refrigerant flow rate of the lower heat exchange tube group 11b. Subsequently, determine whether the upper heat exchange tube group 11a and the lower heat exchange tube group 11b have completed defrosting. Compare TS1 and TS2 with the set exit temperature Td respectively. When TS1 > Td, close the upper control valve 23a. When TS2 > Td, close the lower control valve 23b. After the upper heat exchange tube group 11a and the lower heat exchange tube group 11b have all completed defrosting, exit the defrosting state.

[0051] Second, the temperature difference is relatively large - |TS1 - TS2| ≥ set temperature T. Determine whether the upper heat exchange tube group 11a and the lower heat exchange tube group 11b have completed defrosting. Compare TS1 and TS2 with the set exit temperature Td respectively. When TS1 > Td, close the upper control valve 23a. When TS2 > Td, close the lower control valve 23b. After the upper heat exchange tube group 11a and the lower heat exchange tube group 11b have all completed defrosting, exit the defrosting state.

[0052] It should be noted that the role of the flow deviation adjustment is to make the defrosting speeds of the upper and lower heat exchangers basically the same, reduce the defrosting time difference between the lower heat exchange tube group 11b and the upper heat exchange tube group 11a. Based on the average principle, the refrigerant flow rate is controlled by adjusting the opening of the control valve 23. To improve the adjustment efficiency, the preferred solution is to set the adjustment amount according to the temperature difference, that is, the target opening P of the control valve 23 = P0 - |TS1 - TS2| × K, where P0 is the current opening of the control valve 23, and K is the correction coefficient, and the value range is usually between 0.3 and 0.8.

[0053] In addition, each heat exchange tube group 11 independently judges the defrosting progress. After completing defrosting, close the corresponding control valve 23, so that all the refrigerant is concentrated to complete the defrosting of the other heat exchange tube group 11, shortening the overall defrosting time of the heat exchanger 1 and improving the defrosting efficiency. In actual use, in most cases, the air volume of the lower heat exchange tube group 11b is small, the heat exchange is poor, the frost formation thickness is large, and the bottom of the heat exchanger can be quickly defrosted through the air intake structure of the present invention.

[0054] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model. When the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. For the actions, steps, etc. in the devices and methods shown in the specification and drawings, as long as there is no specific limitation on the execution order, and as long as the output of the previous process is not used in the subsequent process, they can be implemented in any order. The similar sequential terms used for convenience of description do not mean that they must be implemented in such an order.

[0055] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorized specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0056] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. Heat exchanger inlet structure, characterized in that, Comprising: A heat exchanger having at least two heat exchange tube groups, each of the heat exchange tube groups being individually provided with a gas collecting pipe; A flow equalizing box provided with a main pipe for fluid to enter and exit the flow equalizing box and flow equalizing pipes corresponding one by one to the gas collecting pipes, the gas collecting pipes being connected to the flow equalizing box through the corresponding flow equalizing pipes, and each of the flow equalizing pipes being provided with a control valve for regulating the flow rate.

2. The intake structure of the heat exchanger according to claim 1, wherein The inner cavity of the flow equalizing box is divided into a first functional area and a second functional area by a flow equalizing plate provided with pressure equalizing holes, the flow equalizing pipes being arranged in the first functional area and the main pipe being arranged in the second functional area.

3. The intake structure of the heat exchanger according to claim 2, characterized in that, The heat exchanger has at least two heat exchange tube groups arranged vertically, and the flow equalizing pipes are arranged at the top of the first functional area.

4. The intake structure of the heat exchanger according to claim 1, characterized in that The end of the flow equalizing pipe connected to the flow equalizing box is provided with a flared opening, and the flared opening opens towards the inner cavity of the flow equalizing box.

5. The intake structure of the heat exchanger according to claim 1, characterized in that, The cross-sectional area of the flow equalizing box is more than 3 times larger than the cross-sectional area of the main pipe.

6. The intake structure of the heat exchanger according to claim 1, characterized in that, The main pipe extends into the flow equalizing box from the outside to form an extension section, and the opening of the extension section is higher than the inner bottom surface of the flow equalizing box.

7. The intake structure of the heat exchanger according to any one of claims 1 to 6, characterized in that The heat exchanger air inlet structure further comprises: a diverter, one end of each heat exchange tube group being connected to its corresponding gas collecting pipe, and the other ends of all the heat exchange tube groups being connected to the diverter.

8. Air conditioner unit, comprising: A compressor, an outdoor heat exchanger, a throttling element and an indoor heat exchanger, characterized in that the outdoor heat exchanger and / or the indoor heat exchanger adopt the heat exchanger air inlet structure according to any one of claims 1 to 7.

9. The air conditioner unit according to claim 8, wherein, The outdoor heat exchanger adopts the heat exchanger air inlet structure, and the main pipe is connected to the exhaust side of the compressor when the air conditioner unit is in the refrigeration state or the defrosting state.

10. The air-conditioning unit according to claim 9, characterized in that, The air conditioner unit further comprises: a four-way valve for switching the refrigerant flow direction, and the main pipe is connected to the suction side of the compressor when the air conditioner unit is in the heating state.

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