Heat exchanger and heating and ventilation equipment

Abstract

The utility model provides a heat exchanger and heating and ventilation equipment, the heat exchanger comprises a plurality of heat exchange tubes arranged in parallel, a collecting pipe, a plugging piece and an input pipe, a first flow channel, a second flow channel and a plurality of third flow channels are formed in the collecting pipe, the first flow channel and the second flow channel are used for circulating fluid, and the heat exchange tubes are inserted into the third flow channels. The plugging piece and the input pipe are transversely inserted into the two ends of the collecting pipe correspondingly and plug the first flow channel and the second flow channel. The heat exchanger is provided with the second flow channel forming the circulation loop with the first flow channel, the second flow channel can guide fluid in the first flow channel to the bottom of the first flow channel again, the fluid retention phenomenon at the bottom of the first flow channel is improved, and the heat exchange performance of the heat exchanger is further improved. The first flow channel and the second flow channel of the collecting pipe penetrate through the collecting pipe, the first flow channel and the second flow channel are transversely inserted into the collecting pipe from the side wall of the collecting pipe through the plugging piece and the input pipe to achieve plugging, a space for fluid to flow is formed, machining is convenient, and cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a heat exchanger and a heating and ventilation device. Background Art

[0002] The information provided in this part is only background information related to the present disclosure, and it is not necessarily prior art.

[0003] Parallel flow heat exchangers are widely used in automotive air conditioners, industrial production, and household and commercial air conditioners due to their high heat exchange efficiency and good processing performance. In some applications, in order to ensure the drainage of the plate fin parallel flow heat exchanger, there is a method of arranging the header along the vertical direction. When such a structure of the parallel flow heat exchanger is used as an evaporator, the following problems will occur: Due to the influence of gravity, the refrigerant is likely to stay in the lower part of the space in the header. Especially in the header on the refrigerant inlet side, due to the large height, obvious downward retention of the refrigerant will occur. Especially when the refrigerant flow rate is insufficient, the difference in the refrigerant flow rate between the lower part and the upper part of the header is very obvious, resulting in a decline in the overall heat exchange performance of the heat exchanger. Summary of the Utility Model

[0004] The purpose of the present utility model is to at least solve the technical problem that the lower part of the header of the existing parallel flow heat exchanger is prone to retain the refrigerant, resulting in a decline in the performance of the heat exchanger. This purpose is achieved through the following technical solutions:

[0005] A first aspect of the present utility model provides a heat exchanger, comprising:

[0006] A plurality of heat exchange tubes arranged in parallel;

[0007] A header, in which a first flow channel, a second flow channel, and a plurality of third flow channels are formed. The first flow channel and the second flow channel are respectively arranged along the length direction of the header and both penetrate the header. The plurality of third flow channels are arranged at intervals along the length direction of the header. The first flow channel is communicated with the heat exchange tubes through the third flow channels. A first insertion hole, a first communication hole, a second communication hole, and a second insertion hole are provided in the part of the header between the first flow channel and the second flow channel. The first insertion hole, the first communication hole, the second communication hole, and the second insertion hole are arranged in sequence along the length direction of the header. Along the length direction of the header, both ends of the first flow channel are communicated with the second flow channel through the first communication hole and the second communication hole respectively. The header is further provided with a third insertion hole and a fourth insertion hole, and the third insertion hole and the fourth insertion hole are respectively communicated with the outside;

[0008] A plugging member, which is sequentially inserted into the first insertion hole and the third insertion hole and plugs the first flow channel and the second flow channel;

[0009] An input pipe is inserted into the second insertion hole and the fourth insertion hole, and seals the first flow channel and the second flow channel. The input pipe is communicated with the first flow channel and is used for allowing external fluid to flow into the first flow channel.

[0010] The heat exchanger proposed by the present utility model introduces the fluid to be heat-exchanged externally into the first flow channel through the input pipe, and then distributes it to a plurality of heat exchange pipes connected in parallel through a plurality of third flow channels. The heat exchanger is also provided with a second flow channel that forms a circulation loop with the first flow channel. The second flow channel can redirect the fluid in the first flow channel to the bottom of the first flow channel, improving the fluid retention phenomenon at the bottom of the first flow channel and further improving the heat exchange performance of the heat exchanger. Moreover, in the manifold of the present utility model, both the first flow channel and the second flow channel penetrate through the manifold, which is convenient for processing. The third flow channel can also be directly drilled from the outside of the manifold. The first flow channel and the second flow channel are respectively sealed by a sealing member and the input pipe by horizontally inserting them into the interior of the manifold from the side wall of the manifold, thereby forming a space for fluid flow. The structure of this manifold is simple and convenient for processing, and it can be made of profiles with relatively low cost.

[0011] In addition, the heat exchanger according to the present utility model may further have the following additional technical features:

[0012] In some embodiments of the present utility model, an input channel is formed in the input pipe, and an inflow hole is provided on the side wall of the input pipe. The input channel is communicated with the first flow channel through the inflow hole.

[0013] In some embodiments of the present utility model, the flow cross-section of the inflow hole is smaller than the flow cross-section of the input pipe and the flow cross-section of the inflow hole is smaller than the flow cross-section of the first flow channel.

[0014] In some embodiments of the present utility model, the input channel forms an open end at the first end of the input pipe. The first end of the input pipe abuts against the wall surface of the first flow channel, and the wall surface of the first flow channel seals the open end.

[0015] In some embodiments of the present utility model, the sealing member includes a sealing pipe, and the wall surface of the first flow channel seals one end of the sealing pipe located in the first flow channel.

[0016] In some embodiments of the present utility model, along the length direction of the manifold, the position of the first communication hole corresponds to the position of the first third flow channel among the plurality of third flow channels, and the position of the second communication hole corresponds to the position of the last third flow channel among the plurality of third flow channels.

[0017] In some embodiments of the present utility model, the flow cross-section of the second flow channel is greater than or equal to the flow cross-section of the first flow channel.

[0018] In some embodiments of the present utility model, on one side of the header pipe where the third flow channel is provided, there is also an installation groove which extends along the length direction of the header pipe. The heat exchanger further includes a partition component disposed in the installation groove. The partition component has a plurality of partition parts spaced along the length direction of the header pipe. The heat exchanger further includes a plate component fastened to the installation groove. The plate component is provided with a plurality of third communication holes spaced along the length direction of the header pipe. A rectifying cavity is defined between two adjacent partition parts, the groove wall of the installation groove and the plate component. Along the length direction of the header pipe, the positions of the plurality of third communication holes correspond to the positions of the plurality of third flow channels one by one, and each third communication hole communicates with the corresponding third flow through the rectifying cavity. The heat exchange tube is inserted into the third communication hole and communicates with the rectifying cavity.

[0019] In some embodiments of the present utility model, the header pipe is a profile member.

[0020] The second aspect of the present utility model provides a heating and ventilation device, including the heat exchanger provided in the first aspect of the present utility model.

[0021] The heating and ventilation device provided in the second aspect of the present utility model has the same beneficial effects as the heat exchanger provided in the first aspect of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0023] Figure 1 Schematically shows a schematic structural diagram of the header pipe according to the present utility model from a first perspective;

[0024] Figure 2 Schematically shows a schematic structural diagram of the header pipe according to the present utility model from a second perspective;

[0025] Figure 3 Schematically shows a schematic cross-sectional structural diagram of the header pipe according to the present utility model;

[0026] Figure 4 Schematically shows a partial structural diagram of the header pipe (the plate component is not shown) according to the present utility model;

[0027] Figure 5 Schematically shows a schematic structural diagram of the plate component according to the present utility model.

[0028] The marks in the drawings are represented as follows:

[0029] 100, manifold; 101, heat exchange tube;

[0030] 10, first flow channel; 11, second flow channel; 12, third flow channel; 13, first communication hole; 14, second communication hole; 15, third communication hole;

[0031] 20, first insertion hole; 21, second insertion hole; 22, third insertion hole; 23, fourth insertion hole; 24, plugging member;

[0032] 30, input pipe; 31, input channel; 32, inflow hole; 33, open end;

[0033] 40, installation groove; 41, partition assembly; 411, partition part; 42, rectifying cavity; 43, plate assembly. Detailed implementation manners

[0034] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0035] It should be understood that the terms used herein are only for the purpose of describing specific exemplary embodiments and are not intended to be limiting. Unless otherwise clearly specified in the context, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "include", "comprise", "contain", and "have" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be executed in the particular order described or illustrated, unless the execution order is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0036] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first" and "second" and other numerical terms used herein do not imply an order or sequence. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0037] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inner", "outer", "inside", "outside", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "beneath" another element or feature will then be oriented "above" or "over" the other element or feature. Thus, the exemplary term "below" can include both an orientation above and below. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are to be interpreted accordingly.

[0038] As Figures 1 to 5 shown, Figure 3The A direction represents the length direction of the header pipe 100. In the first aspect of the present invention, a heat exchanger is proposed, which includes a plurality of heat exchange pipes 101, a header pipe 100, a plugging member 24, and an input pipe 30. The plurality of heat exchange pipes 101 are arranged in parallel. A first flow channel 10, a second flow channel 11, an input channel 31, and a plurality of third flow channels 12 are formed in the header pipe 100. Both the first flow channel 10 and the second flow channel 11 penetrate the header pipe 100 along the length direction of the header pipe 100. The plurality of third flow channels 12 are arranged at intervals along the length direction of the header pipe 100. The first flow channel 10 is communicated with the heat exchange pipes 101 through the third flow channels 12. A first insertion hole 20, a first communication hole 13, a second communication hole 14, and a second insertion hole 21 are provided in the part of the header pipe 100 between the first flow channel 10 and the second flow channel 11. The first insertion hole 20, the first communication hole 13, the second communication hole 14, and the second insertion hole 21 are arranged in sequence along the length direction of the header pipe 100. Along the length direction of the header pipe 100, both ends of the first flow channel 10 are communicated with the second flow channel 11 through the first communication hole 13 and the second communication hole 14 respectively. The header pipe 100 is further provided with a third insertion hole 22 and a fourth insertion hole 23, and the third insertion hole 22 and the fourth insertion hole 23 are communicated with the outside. The plugging member 24 is sequentially inserted into the first insertion hole 20 and the third insertion hole 22, and plugs the first flow channel 10 and the second flow channel 11. The input pipe 30 is sequentially inserted into the second insertion hole 21 and the fourth insertion hole 23, and plugs the first flow channel 10 and the second flow channel 11. The input pipe 30 is communicated with the first flow channel 10, and the input channel 31 is used for allowing an external fluid to flow into the first flow channel 10.

[0039] It can be understood that the manifold 100 can be an integral structure, such as a profile, and the manifold 100 is in the shape of a long tube. By machining the first flow channel 10 and the second flow channel 11 through the manifold 100, and opening the third insertion hole 22 and the fourth insertion hole 23 on the side wall of the manifold 100, and then extending into the interior of the manifold 100, the first insertion hole 20 and the second insertion hole 21 are arranged in the part between the first flow channel 10 and the second flow channel 11. Then, the plugging member 24 is inserted through the first insertion hole 20 and the third insertion hole 22, and the input pipe 30 is inserted through the second insertion hole 21 and the fourth insertion hole 23 to block both ends of the first flow channel 10 and the second flow channel 11 to prevent fluid leakage. By arranging the first communication hole 13 and the second communication hole 14 in the part between the first flow channel 10 and the second flow channel 11, the first flow channel 10 and the second flow channel 11 are connected end to end to form a circulation loop, so that the fluid at the end of the first flow channel 10 flows back to the bottom of the first flow channel 10 through the second flow channel 11, reducing the fluid retention at the bottom of the first flow channel 10 and improving the heat exchange effect. On the other side of the manifold 100, a plurality of third flow channels 12 are arranged at intervals along the length direction of the manifold 100. One end of the third flow channel 12 is communicated with the first flow channel 10, and the other end of the third flow channel 12 is inserted with a heat exchange tube 101. A plurality of heat exchange tubes 101 are arranged in parallel for heat exchanging the fluid. The input channel 31 is arranged at the bottom of the manifold 100, that is, close to the second communication hole 14 and the second insertion hole 21. In addition, one end of each of the plurality of heat exchange tubes 101 is distributed and communicated with a plurality of third flow channels 12 arranged side by side on the manifold 100, and the other end of the heat exchange tube 101 is communicated with a gas collecting pipe. The refrigerant is distributed from the manifold 100 to a plurality of parallel heat exchange tubes 101 for heat exchange and evaporation, turning into gas, and then is collected by the gas collecting pipe and discharged from the heat exchanger.

[0040] The heat exchanger proposed by the present utility model introduces the external fluid to be heat exchanged into the first flow channel 10 through the input pipe 30, and then distributes it to a plurality of parallel heat exchange tubes 101 through a plurality of third flow channels 12. The heat exchanger is also provided with a second flow channel 11 that forms a circulation loop with the first flow channel 10. The second flow channel 11 can redirect the fluid in the first flow channel 10 to the bottom of the first flow channel 10, improving the fluid retention phenomenon at the bottom of the first flow channel 10 and further improving the heat exchange performance of the heat exchanger. Moreover, in the manifold 100 of the present utility model, both the first flow channel 10 and the second flow channel 11 penetrate through the manifold 100, which is convenient for processing. The third flow channel 12 can also be directly drilled from the outside of the manifold 100. The first flow channel 10 and the second flow channel 11 are respectively blocked by inserting the plugging member 24 and the input pipe 30 horizontally into the interior of the manifold 100 from the side wall of the manifold 100, thereby forming a space for fluid flow. The structure of the manifold 100 is simple and convenient for processing, and it can be made of profiles with relatively low cost.

[0041] In some embodiments of the present invention, an input channel 31 is formed in the input pipe 30 , and an inflow hole 32 is provided on the side wall of the input pipe 30 . The fluid input channel is connected to the first flow channel 10 through the inflow hole 32 .

[0042] It is understandable that the input pipe 30 may be a straight pipe structure, and an input channel 31 is formed inside the input pipe 30, and one end of the input channel 31 is used to introduce external fluid. The side wall of the input pipe 30 is provided with an inflow hole 32, and the inflow hole 32 may be arranged toward the blocking member 24, so that the fluid inflow direction is toward the top of the first flow channel 10 or the middle of the first flow channel 10. Specifically, the inflow hole 32 may be arranged as a circular hole or a rectangular hole according to actual needs.

[0043] In some embodiments of the present invention, a flow cross section of the inflow hole 32 is smaller than a flow cross section of the input pipe 30 and a flow cross section of the first flow channel 10 .

[0044] It can be understood that the inflow hole 32 is a throttling hole structure, which can throttle the fluid flowing out of the input pipe 30, improve the flow efficiency, increase the speed of the fluid flowing to the first flow channel 10, reduce the fluid retention phenomenon at the end of the first flow channel 10, and thus improve the heat exchange efficiency. Specifically, the inflow hole 32 can be circular or rectangular.

[0045] In some embodiments of the present invention, the input channel 31 forms an opening 33 at the first end of the input pipe 30 , the first end of the input pipe 30 abuts against the wall of the first flow channel 10 , and the wall of the first flow channel 10 blocks the opening 33 .

[0046] It can be understood that both ends of the input pipe 30 are open, one end is used to connect to an external pipeline to introduce external fluid, and the other end abuts against the wall of the first flow channel 10 so that the end is blocked and sealed by the first flow channel 10, so that all the fluid flows out from the inlet hole 32 into the first flow channel 10.

[0047] In some embodiments of the present invention, the blocking member 24 includes a blocking tube, and the wall blocking tube of the first flow channel 10 is located at one end in the first flow channel 10 .

[0048] It can be understood that the blocking tube has a tubular structure and can have the same structure as the input tube 30, but the inflow hole 32 on the blocking tube is located on the side of the blocking tube away from the input tube 30, so that the side of the blocking tube facing the input tube 30 can block the first flow channel 10, and the wall surface of the first flow channel 10 blocks the end of the blocking tube, thereby reducing the leakage of the fluid from the blocking tube and improving the sealing performance.

[0049] In some embodiments of the present utility model, along the length direction of the manifold 100, the position of the first communication hole 13 corresponds to the position of the third flow channel 12 at the head end, and the position of the second communication hole 14 corresponds to the position of the third flow channel 12 at the tail end.

[0050] It can be understood that the first communication hole 13 is coaxially arranged with the third flow channel 12 at the head end, and the second communication hole 14 is coaxially arranged with the third flow channel 12 at the tail end, so that the first communication hole 13 and the third flow channel 12 at the head end, as well as the second communication hole 14 and the third flow channel 12 at the tail end, can be machined simultaneously during processing, improving the processing efficiency and reducing the cost.

[0051] In some embodiments of the present utility model, the flow cross-section of the second flow channel 11 is greater than or equal to the flow cross-section of the first flow channel 10.

[0052] It can be understood that the flow cross-section refers to the cross-section through which the fluid flows in the flow channel, that is, the radial cross-section of the flow channel. The flow cross-section of the second flow channel 11 can be circular, rectangular or semi-circular. The cross-sectional area of the second flow channel 11 is greater than the cross-sectional area of the first flow channel 10, so that the pressure drop of the second flow channel 11 is less than the pressure drop of the first flow channel 10, ensuring that the fluid can circulate in the first flow channel 10 and the second flow channel 11, reducing the fluid retention phenomenon at the bottom of the first flow channel 10, and improving the heat exchange efficiency.

[0053] In some embodiments of the present utility model, an installation groove 40 is further provided on the side of the manifold 100 where the third flow channel 12 is provided. The installation groove 40 extends along the length direction of the manifold 100. The heat exchanger further includes a partition assembly 41 disposed in the installation groove 40. The partition assembly 41 has a plurality of partition portions 411 spaced along the length direction of the manifold 100. The heat exchanger further includes a plate assembly 43 fastened to the installation groove 40. The plate assembly 43 is provided with a plurality of third communication holes 15 spaced along the length direction of the manifold 100. A rectifying cavity 42 is defined between two adjacent partition portions 411, the groove wall of the installation groove 40 and the plate assembly 43. Along the length direction of the manifold 100, the positions of the plurality of third communication holes 15 correspond to the positions of the plurality of third flow channels 12. A rectifying cavity 42 is communicated between a corresponding third communication hole 15 and a third flow channel 12. The heat exchange tube 101 is inserted into the third communication hole 15 and communicated with the rectifying cavity 42.

[0054] It can be understood that, in order to further improve the heat exchange efficiency and effect, a plurality of rectifying chambers 42 and matching throttle holes can be provided between the header pipe 100 and the heat exchange pipes 101. An installation groove 40 can be opened on one side of the header pipe 100. The installation groove 40 is defined by the main body of the header pipe 100 and two side plates. A plurality of rectifying chambers 42 arranged at intervals along the length direction of the header pipe 100 are separated in the installation groove 40 by arranging a partition component 41. The partition component 41 can be integrally formed with the rectifying pipe. For example, a plurality of partition parts 411 are cut out on one side of the header pipe 100, or are independently arranged. For example, a plurality of partition parts 411 are fixedly connected through a connecting part and then installed in the installation groove 40. The installation groove 40 is sealed by a plate component 43. The plate component 43 can be a plate with a plurality of third communication holes 15 opened thereon. The third communication holes 15 are used for inserting the heat exchange pipes 101. The fluid from the first flow channel 10 enters the rectifying chamber 42 for rectification and then enters the heat exchange pipe 101 through the third communication holes 15. Specifically, the third flow channel 12 and the third communication holes 15 can be set as a throttle hole type structure to improve the flow efficiency. In addition, the rectifying chamber 42 can be a cubic or cylindrical structure.

[0055] In some embodiments of the present invention, the header pipe 100 is a profile member. The profile member can be an aluminum profile, and structures such as the first flow channel 10, the second flow channel 11, and the third flow channel 12 are formed by drilling holes in the profile member. The profile member is convenient for obtaining materials and processing, and can reduce the cost of the heat collecting pipe.

[0056] A second aspect of the present invention provides a heating and ventilation device, including the heat exchanger provided in the first aspect of the present invention.

[0057] The heating and ventilation device provided in the second aspect of the present invention has the same beneficial effects as the heat exchanger provided in the first aspect of the present invention. The heating and ventilation device can be an air conditioner, and the heat exchanger can be the heat exchanger of the indoor unit of the air conditioner. The refrigerant heats up and evaporates in the heat exchanger, and the fan blows the low-temperature air generated by the refrigerant into the room for refrigeration.

[0058] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A heat exchanger, characterized in that: include: A plurality of heat exchange tubes arranged in parallel; A collecting pipe, wherein a first flow channel, a second flow channel and a plurality of third flow channels are formed in the collecting pipe, the first flow channel and the second flow channel are respectively arranged along the length direction of the collecting pipe and both penetrate the collecting pipe, the plurality of third flow channels are arranged at intervals along the length direction of the collecting pipe, the first flow channel is connected with the heat exchange tube through the third flow channel, a portion of the collecting pipe located between the first flow channel and the second flow channel is provided with a first plug hole, a first connecting hole, a second connecting hole and a second plug hole, the first connecting hole, the first connecting hole, the second connecting hole and the second plug hole are arranged in sequence along the length direction of the collecting pipe, along the length direction of the collecting pipe, two ends of the first flow channel are connected with the second flow channel through the first connecting hole and the second connecting hole respectively, the collecting pipe is further provided with a third plug hole and a fourth plug hole, the third plug hole and the fourth plug hole are respectively connected with the outside; A blocking member, which is plugged into the first plug hole and the third plug hole in sequence, and blocks the first flow channel and the second flow channel; An input tube is plugged into the second plug hole and the fourth plug hole and blocks the first flow channel and the second flow channel. The input tube is connected to the first flow channel and is used for external fluid to flow into the first flow channel.

2. The heat exchanger according to claim 1, characterized in that: An input channel is formed in the input pipe, an inflow hole is provided on the side wall of the input pipe, and the input channel is connected with the first flow channel through the inflow hole.

3. The heat exchanger according to claim 2, characterized in that: The flow cross section of the inflow hole is smaller than the flow cross section of the inlet pipe, and the flow cross section of the inflow hole is smaller than the flow cross section of the first flow channel.

4. The heat exchanger according to claim 2, characterized in that: The input channel forms an opening at the first end of the input pipe, the first end of the input pipe abuts against the wall surface of the first flow channel, and the wall surface of the first flow channel blocks the opening.

5. The heat exchanger according to claim 1, characterized in that: The blocking member includes a blocking tube, and the wall surface of the first flow channel blocks one end of the blocking tube located in the first flow channel.

6. The heat exchanger according to claim 1, characterized in that Along the length direction of the collecting pipe, the position of the first connecting hole corresponds to the position of the third flow channel located at the first position among the plurality of third flow channels, and the position of the second connecting hole corresponds to the position of the third flow channel located at the last position among the plurality of third flow channels.

7. The heat exchanger according to claim 1, characterized in that A flow cross section of the second flow channel is greater than or equal to a flow cross section of the first flow channel.

8. The heat exchanger according to any one of claims 1 to 7, characterized in that: The collecting tube is provided with a mounting groove on one side of the third flow channel, and the mounting groove extends along the length direction of the collecting tube. The heat exchanger also includes a partition assembly arranged in the mounting groove, and the partition assembly has a plurality of partition parts arranged at intervals along the length direction of the collecting tube. The heat exchanger also includes a plate assembly snapped on the mounting groove, and the plate assembly is provided with a plurality of third connecting holes arranged at intervals along the length direction of the collecting tube. A rectifying cavity is defined between two adjacent partition parts, the groove wall of the mounting groove and the plate assembly. Along the length direction of the collecting tube, the positions of the plurality of third connecting holes correspond one by one to the positions of the plurality of third flow channels, and each of the third connecting holes is connected to the third flow channel at the corresponding position through the rectifying cavity, and the heat exchange tube is inserted into the third connecting hole and connected to the rectifying cavity.

9. The heat exchanger according to any one of claims 1 to 7, characterized in that: The collecting pipe is a profile piece.

10. A HVAC equipment, characterized in that: A heat exchanger comprising any one of claims 1 to 9.

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