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 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 input pipe is used for introducing external fluid into the first 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.

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 application scenarios, in order to ensure the drainage of the plate fin parallel flow heat exchanger, there is a method of arranging the header pipe in the vertical direction. When this 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 inside the header pipe. Especially for the header pipe at the refrigerant inlet side, due to its relatively 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 pipe 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 utility model is to at least solve the technical problem that refrigerant retention easily occurs inside the header pipe of the existing parallel flow heat exchanger, resulting in a decline in heat exchange performance. This purpose is achieved through the following technical solutions:

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

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

[0007] A header pipe, in which a first flow channel, a second flow channel, and a plurality of third flow channels are formed. The plurality of third flow channels are arranged at intervals along the length direction of the first flow channel. The first flow channel is communicated with the heat exchange tubes through the third flow channels. Both ends of the second flow channel are communicated with the first flow channel. A first through-hole is provided in the part of the header pipe between the first flow channel and the second flow channel. A second through-hole is provided in the part of the header pipe between the second flow channel and the peripheral wall of the header pipe;

[0008] An input pipe, passing through the first through-hole and the second through-hole. The first end of the axial direction of the input pipe is communicated with the first flow channel, and the second end of the axial direction of the input pipe is used for the inflow of external fluid.

[0009] The heat exchanger proposed by the present utility model introduces the fluid to be heat-exchanged externally into the first flow channel through an 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 back to the first flow channel, improving the fluid retention phenomenon in the first flow channel and further improving the heat exchange performance of the heat exchanger.

[0010] In addition, the heat exchanger according to the present utility model may further have the following additional technical features:

[0011] In some embodiments of the present utility model, an input channel is formed inside the input pipe, a throttling hole is provided at the first end, and the input channel is communicated with the first flow channel through the throttling hole.

[0012] In some embodiments of the present utility model, the first end extends into the first flow channel, the first end abuts against the inner wall surface of the first flow channel, the input channel forms an opening at the first end, and the inner wall surface of the first flow channel blocks the opening.

[0013] In some embodiments of the present utility model, both the first flow channel and the second flow channel extend along the length direction of the manifold and penetrate the manifold. The heat exchanger further includes a first plugging member and a second plugging member. The first plugging member is used to plug the axial first ends of the first flow channel and the second flow channel, and the second plugging member is used to plug the axial second ends of the first flow channel and the second flow channel. The part of the manifold located between the first flow channel and the second flow channel is provided with a first communication hole and a second communication hole. Along the length direction of the manifold, the two ends of the first flow channel are respectively communicated with the second flow channel through the first communication hole and the second communication hole, and both the first communication hole and the second communication hole are located between the first plugging member and the second plugging member.

[0014] In some embodiments of the present utility model, the part of the manifold located between the first flow channel and the second flow channel is further provided with a first insertion hole and a second insertion hole. The part of the manifold located between the second flow channel and the peripheral wall of the manifold is further provided with a third insertion hole and a fourth insertion hole. Along the length direction of the manifold, both the first communication hole and the second communication hole are located between the first insertion hole and the second insertion hole, and the second through-hole is located between the third insertion hole and the fourth insertion hole. The first plugging member is sequentially inserted into the first insertion hole and the third insertion hole, and the second plugging member is sequentially inserted into the second insertion hole and the fourth insertion hole.

[0015] In some embodiments of the present utility model, along the length direction of the header pipe, the position of the first communication hole corresponds to the position of the first third flow channel among the multiple third flow channels, and the position of the second communication hole corresponds to the position of the last third flow channel among the multiple third flow channels.

[0016] In some embodiments of the present utility model, on the side of the header pipe where the third flow channel is provided, there is also an installation groove, the installation groove 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 buckled on 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 channel through the rectifying cavity, and the heat exchange tube is inserted into the third communication hole and communicates with the rectifying cavity.

[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, the header pipe is a profile part.

[0019] A 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.

[0020] 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

[0021] By reading the detailed description of the preferred embodiments below, 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 as limiting the present utility model. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0022] Figure 1 Schematically shows a schematic structural diagram of the header pipe (assembled with the partition component and the plate component) according to the present utility model from a first perspective;

[0023] Figure 2 Schematically shows a schematic structural diagram of the header pipe (assembled with the partition component and the plate component) according to the present utility model from a second perspective;

[0024] Figure 3 Schematically shows a schematic structural view of a manifold according to the present utility model;

[0025] Figure 4 Schematically shows a cross-sectional structural view of a manifold (assembled with a partition assembly and a plate assembly) according to the present utility model;

[0026] Figure 5 Schematically shows a schematic structural view of a plate assembly according to the present utility model;

[0027] Figure 6 Schematically shows a schematic structural view of a partition assembly according to the present utility model.

[0028] The reference signs in the drawings are 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; 16, first through-hole; 17, second through-hole;

[0031] 20, first insertion hole; 21, second insertion hole; 22, third insertion hole; 23, fourth insertion hole; 24, first plugging member; 25, second plugging member;

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

[0033] 40, mounting groove; 41, partition assembly; 411, partition part; 412, connecting 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 for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an" and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing" and "having" 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 their performance in the particular order described or illustrated, unless explicitly indicated as the order of performance. 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", "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 example 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", "inner side", "outer side", "below", "beneath", "above", "upper", 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 example term "below" can include both the above and below orientations. 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 6 shown, Figure 4The A direction represents the length direction of the manifold 100. In the first aspect of the present invention, a heat exchanger is proposed, which includes a manifold 100, an input pipe 30, and a plurality of heat exchange pipes 101 arranged in parallel. A first flow channel 10, a second flow channel 11, and a plurality of third flow channels 12 are formed in the manifold 100. The plurality of third flow channels 12 are arranged at intervals along the length direction of the first flow channel 10. The first flow channel 10 is communicated with the heat exchange pipes 101 through the third flow channels 12. Both ends of the second flow channel 11 are communicated with the first flow channel 10. A first through hole 16 is provided in the part of the manifold 100 between the first flow channel 10 and the second flow channel 11. A second through hole 17 is provided in the part of the manifold 100 between the second flow channel 11 and the peripheral wall of the manifold 100. The input pipe 30 sequentially passes through the first through hole 16 and the second through hole 17. One axial end of the input pipe 30 is used for the inflow of external fluid, and the other axial end of the input pipe 30 is communicated with the first flow channel 10.

[0039] It can be understood that the manifold 100 can be an integral structure, such as a profile, or other combined structures. And the manifold 100 has a long tube structure, and a first flow channel 10, a second flow channel 11, a fluid inflow channel, and a plurality of third flow channels 12 are formed inside. A first communication hole 13 and a second communication hole 14 can be provided in the part of the manifold 100 between the first flow channel 10 and the second flow channel 11 to connect the first flow channel 10 and the second flow channel 11 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 end of the first flow channel 10 through the second flow channel 11, reducing the fluid retention at the bottom end 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 into the heat exchange pipe 101. The plurality of heat exchange pipes 101 are arranged in parallel for heat exchanging the fluid. The input pipe 30 can be arranged at the bottom of the manifold 100. A first through hole 16 and a second through hole 17 extending radially along the manifold 100 can be provided in the lower half of the manifold 100. The second through hole 17 horizontally passes through the peripheral wall of the manifold 100, and the first through hole 16 is communicated with the second flow channel 11 and the first flow channel 10 respectively, so as to facilitate the insertion of the input pipe 30 into the manifold 100 to be communicated with the first flow channel 10. The cross-sectional shape of the input pipe 30 is adapted to the first through hole 16 and the second through hole 17, and can be circular or rectangular. A fluid input channel 31 extending along the axial direction of the input pipe 30 is formed inside the input pipe 30. One axial end of the input pipe 30 is located outside the manifold 100 and is used for the inflow of external fluid. The external fluid flows into the first flow channel 10 through the input pipe 30 for distribution to the plurality of heat exchange pipes 101.

[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 heat exchange pipes 101 connected in parallel 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 back to the first flow channel 10, improving the fluid retention phenomenon in the first flow channel 10 and further improving the heat exchange performance of the heat exchanger.

[0041] In some embodiments of the present utility model, an input channel 31 is formed inside the input pipe 30. A throttling hole 32 is provided at the first end of the input pipe 30, and the input channel 31 communicates with the first flow channel 10 through the throttling hole 32.

[0042] It can be understood that the throttling hole 32 can be provided at the port or the peripheral wall at one axial end of the input pipe 30 to increase the flow velocity of the fluid entering the first flow channel 10. In addition, the input pipe 30 is also in contact with the wall of the first through-hole 16, so that the first flow channel 10 cannot communicate with the second flow channel 11 through the first through-hole 16.

[0043] In some embodiments of the present utility model, the first end of the input pipe 30 extends into the first flow channel 10, the first end of the input pipe 30 abuts against the wall surface of the first flow channel 10, an open end 33 is formed at the first end of the input channel 31 in the input pipe 30, and the wall surface of the first flow channel 10 seals the open end 33.

[0044] It can be understood that the input pipe 30 also abuts against the wall surface of the first flow channel 10, so that the end of the second input pipe 30 is closed. The input port can be opened on the side wall of the second input pipe 30 on the side away from the second sealing member 25, so that the fluid can spray into the first flow channel 10. The shape of the input port can be circular or rectangular, and the diameter of the input port is smaller than the diameter of the first flow channel 10, so that the input port plays a throttling role and improves the fluid flow efficiency.

[0045] In some embodiments of the present utility model, both the first flow channel 10 and the second flow channel 11 extend along the length direction of the manifold 100 and penetrate the manifold 100. The heat exchanger further includes a first sealing member 24 and a second sealing member 25. The first sealing member 24 is used to seal the first axial end of the first flow channel 10 and the second flow channel 11, and the second sealing member 25 is used to seal the second axial end of the first flow channel 10 and the second flow channel 11. The part of the manifold 100 located between the first flow channel 10 and the second flow channel 11 is provided with a first communication hole 13 and a second communication hole 14. Along the length direction of the manifold 100, the two ends of the first flow channel 10 are respectively communicated with the second flow channel 11 through the first communication hole 13 and the second communication hole 14, and both the first communication hole 13 and the second communication hole 14 are located between the first sealing member 24 and the second sealing member 25.

[0046] It can be understood that the first plugging member 24 and the second plugging member 25 can be in a plate-like structure, and are horizontally inserted into the manifold 100 in the radial direction of the manifold 100 to plug both ends of the first flow channel 10 and the second flow channel 11, forming a closed flow channel and reducing fluid leakage. The first plugging member 24 and the second plugging member 25 can also be structures having two plugging blocks, and the plugging blocks are inserted into both ends of the first flow channel 10 and the second flow channel 11 axially penetrating the manifold 100 to achieve plugging.

[0047] In some embodiments of the present invention, the portion of the manifold 100 between the first flow channel 10 and the second flow channel 11 is further provided with a first insertion hole 20 and a second insertion hole 21, and the portion of the manifold 100 between the second flow channel 11 and the peripheral wall of the manifold 100 is further provided with a third insertion hole 22 and a fourth insertion hole 23. Along the length direction of the manifold 100, both the first communication hole 13 and the second communication hole 14 are located between the first insertion hole 20 and the second insertion hole 21, and the second through hole 17 is located between the third insertion hole 22 and the fourth insertion hole 23. The first plugging member 24 is sequentially inserted into the first insertion hole 20 and the third insertion hole 22, and the second plugging member 25 is sequentially inserted into the second insertion hole 21 and the fourth insertion hole 23.

[0048] It can be understood that the second through hole 17 is located between the second communication hole 14 and the second insertion hole 21, and the third through hole is located between the third insertion hole 22 and the fourth insertion hole 23. The first insertion hole 20 and the third insertion hole 22 can be in a long hole structure to match the plate-like structure of the first plugging member 24 to improve the sealing effect. Correspondingly, the second insertion hole 21 and the fourth insertion hole 23 can be in a long hole structure to match the plate-like structure of the second plugging member 25 to improve the sealing effect, so that after the input pipe 30 is inserted into the first through hole 16 and the second through hole 17, it is located in the first flow channel 10 and the second flow channel 11. The second plugging member 25 can close the output end of the input pipe 30 in the first flow channel 10 and plug the second axial end of the second flow channel 11 to avoid fluid leakage.

[0049] In some embodiments of the present invention, along the length direction of the manifold 100, the position of the first communication hole 13 corresponds to the position of the first third flow channel 12 among the plurality of third flow channels 12, and the position of the second communication hole 14 corresponds to the position of the last third flow channel 12 among the plurality of third flow channels 12.

[0050] It can be understood that the first communication hole 13 can be coaxially arranged with the third flow channel 12 at the head end, and the second communication hole 14 is also 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 can be machined in one step, and the second communication hole 14 and the third flow channel 12 at the tail end can also be machined in one step, improving the processing cost and efficiency of the manifold 100.

[0051] In some embodiments of the present invention, 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.

[0052] It can be understood that to further improve the heat exchange efficiency and effect, a plurality of rectifying cavities 42 and matching throttle holes 32 can be provided between the manifold 100 and the heat exchange tube 101. An installation groove 40 can be opened on one side of the manifold 100. The installation groove 40 is defined by the main body of the manifold 100 and two side plates. A plurality of rectifying cavities 42 spaced along the length direction of the manifold 100 are separated in the installation groove 40 by arranging the partition assembly 41. The partition assembly 41 can be integrally formed with the rectifying tube. For example, a plurality of partition portions 411 are cut out on one side of the manifold 100, or are independently provided. For example, the plurality of partition portions 411 are connected and fixed by a connecting portion 412 and then installed in the installation groove 40. The installation groove 40 is sealed by the plate assembly 43. The plate assembly 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 tube 101. The fluid from the first flow channel 10 enters the rectifying cavity 42 through the third flow channel 12 for rectification and then enters the heat exchange tube 101 through the third communication hole 15. Specifically, the third flow channel 12 and the third communication hole 15 can be set as a throttle hole 32 type structure to improve the flow efficiency. In addition, the rectifying cavity 42 can be a cubic or cylindrical structure.

[0053] In some embodiments of the present invention, along the width direction of the manifold 100, 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.

[0054] It can be understood that the flow cross-section refers to the flow cross-section of 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 semicircular. The cross-sectional area of ​​the second flow channel 11 is larger than the cross-sectional area of ​​the first flow channel 10, so that the pressure drop of the second flow channel 11 is smaller 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.

[0055] In some embodiments of the present invention, the collector 100 is a profile. The profile may be an aluminum profile, and holes are drilled on the profile to form the first flow channel 10, the second flow channel 11, and the third flow channel 12. The profile is easy to obtain and process, and can reduce the cost of the collector.

[0056] The second aspect of the utility model provides a HVAC device, including the heat exchanger provided in the first aspect of the utility model.

[0057] The HVAC equipment proposed in the second aspect of the present invention has the same beneficial effects as the heat exchanger proposed in the first aspect of the present invention. The HVAC equipment may be an air conditioner, and the heat exchanger may be a heat exchanger of an 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 cooling.

[0058] The above are only preferred specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on 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 manifold, wherein a first flow channel, a second flow channel and a plurality of third flow channels are formed in the manifold, wherein the plurality of third flow channels are arranged at intervals along the length direction of the first flow channel, wherein the first flow channel is connected to the heat exchange tube through the third flow channel, and both ends of the second flow channel are connected to the first flow channel, wherein a portion of the manifold located between the first flow channel and the second flow channel is provided with a first connection hole, and a portion of the manifold located between the second flow channel and the peripheral wall of the manifold is provided with a second connection hole; An input tube is provided through the first connection hole and the second connection hole, a first axial end of the input tube is communicated with the first flow channel, and a second axial end of the input tube is used for external fluid to flow in.

2. The heat exchanger according to claim 1, characterized in that: An input channel is formed inside the input pipe, a throttling hole is provided at the first end, and the input channel is communicated with the first flow channel through the throttling hole.

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

4. The heat exchanger according to claim 2, characterized in that: The first flow channel and the second flow channel both extend along the length direction of the collecting pipe and penetrate the collecting pipe. The heat exchanger also includes a first sealing member and a second sealing member. The first sealing member is used to seal the axial first end of the first flow channel and the second flow channel, and the second sealing member is used to seal the axial second end of the first flow channel and the second flow channel. The portion of the collecting pipe located between the first flow channel and the second flow channel is provided with a first connecting hole and a second connecting hole. Along the length direction of the collecting pipe, the two ends of the first flow channel are connected to the second flow channel through the first connecting hole and the second connecting hole respectively, and the first connecting hole and the second connecting hole are both located between the first sealing member and the second sealing member.

5. The heat exchanger according to claim 4, characterized in that The portion of the collecting pipe located between the first flow channel and the second flow channel is also provided with a first plug hole and a second plug hole, and the portion of the collecting pipe located between the second flow channel and the peripheral wall of the collecting pipe is also provided with a third plug hole and a fourth plug hole. Along the length direction of the collecting pipe, the first connecting hole and the second connecting hole are both located between the first plug hole and the second plug hole, and the second through hole is located between the third plug hole and the fourth plug hole. The first blocking piece is plugged into the first plug hole and the third plug hole, and the second blocking piece is plugged into the second plug hole and the fourth plug hole.

6. The heat exchanger according to claim 4, 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 multiple 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 multiple third flow channels.

7. The heat exchanger according to any one of claims 1 to 6, 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.

8. The heat exchanger according to any one of claims 1 to 6, 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.

9. The heat exchanger according to any one of claims 1 to 6, 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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