Header assembly and heat exchanger

Abstract

The header assembly comprises a header part and a flow guide part, the header part comprises a first cavity and a second cavity, the flow guide part comprises a flow guide channel, the flow guide part comprises a first communicating part and a second communicating part, the flow guide channel can communicate with the first cavity through the first communicating part, and the flow guide channel can communicate with the second cavity through the second communicating part; the header assembly comprises a first end part and a second end part in the extension direction of the header assembly, the header assembly comprises an isolation part, the first cavity is located on one side of the isolation part, the second cavity is located on the other side of the isolation part, and the first communication part is closer to the first end part than the isolation part in the extension direction of the header assembly; at least part of the gaseous refrigerant is led out of the first cavity through the flow guide part, the uniformity of the gas state and the liquid state of the refrigerant in the first cavity is effectively improved, and the heat exchange performance of the heat exchanger is improved.

Description

Technical Field

[0001] The present application relates to the field of refrigeration, and in particular to a header assembly and a heat exchanger. Background Art

[0002] The heat exchanger includes a header and heat exchange tubes. Both ends of the heat exchange tubes are inserted into the header. When the heat exchanger is used as an evaporator, the refrigerant flows into the heat exchange tubes through the header to exchange heat with the material outside the heat exchange tubes.

[0003] When the heat exchanger is used as an evaporator, the refrigerant entering the manifold is generally a gas-liquid mixture. Under the action of gravity, the gaseous refrigerant and the liquid refrigerant will separate in the manifold, and the gaseous refrigerant will flow upward into the upper heat exchange tubes, and the liquid refrigerant will flow downward into the lower heat exchange tubes, resulting in poor heat exchange effect in the upper heat exchange tubes, greatly reducing the heat exchange effect of the heat exchanger. Summary of the invention

[0004] The purpose of the present application is to provide a header assembly and a heat exchanger that effectively improve the mixing uniformity of gas-liquid two-phase refrigerants.

[0005] On one hand, the present application provides a manifold assembly, including a manifold portion and a flow guide portion, the manifold portion including a first cavity and a second cavity, the first cavity including an opening, the flow guide portion including a flow guide channel, the flow guide portion including a first connecting portion and a second connecting portion, the flow guide channel can be connected to the first cavity through the first connecting portion, and the flow guide channel can be connected to the second cavity through the second connecting portion; Along the extension direction of the manifold assembly, the manifold assembly includes a first end and a second end, the manifold assembly includes an isolation portion, the first cavity is located on one side of the isolation portion, and the second cavity is located on the other side of the isolation portion. Along the extension direction of the manifold assembly, the first connecting portion is closer to the first end than to the isolation portion.

[0006] By providing a guide portion connecting the first cavity and the second cavity, and opening the first connecting portion and the second connecting portion in the guide portion, the guide channel can be connected to the first cavity through the first connecting portion, and connected to the second cavity through the second connecting portion. The gaseous refrigerant in the first cavity can flow into the guide portion through the first connecting portion, and then flow into the second cavity through the second connecting portion. At least part of the gaseous refrigerant is led out of the first cavity through the guide portion, thereby effectively improving the uniformity of the gas-liquid state of the refrigerant in the first cavity.

[0007] On the other hand, the present application provides a heat exchanger, including a plurality of heat exchange tubes and a header assembly, wherein the header assembly includes a header portion, the header portion includes a first cavity and a second cavity, the heat exchange tubes are arranged along the extension direction of the header assembly, the heat exchange tubes include refrigerant channels, the refrigerant channels of some of the heat exchange tubes are connected to the first cavity, and the refrigerant channels of another part of the heat exchange tubes are connected to the second cavity; the header assembly includes a guide portion, the guide portion includes a guide channel, the guide portion includes a first connecting portion and a second connecting portion, the guide channel can be connected to the first cavity through the first connecting portion, and the guide channel can be connected to the second cavity through the second connecting portion; along the extension direction of the header assembly, the header assembly includes a first end portion and a second end portion, the header assembly includes an isolation portion, the first cavity is located on one side of the isolation portion, the second cavity is located on the other side of the isolation portion, and along the extension direction of the header assembly, the first connecting portion is closer to the first end portion than the isolation portion.

[0008] By providing a guide portion connecting the first cavity and the second cavity in the manifold assembly, and providing the first connecting portion and the second connecting portion in the guide portion, the guide channel can be connected to the first cavity through the first connecting portion, and connected to the second cavity through the second connecting portion. The gaseous refrigerant in the first cavity can flow into the guide portion through the first connecting portion, and then flow into the second cavity through the second connecting portion. At least part of the gaseous refrigerant is led out of the first cavity through the guide portion, thereby effectively improving the uniformity of the gas-liquid state of the refrigerant in the first cavity and enhancing the heat exchange performance of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the first embodiment of the header assembly of the present application; Figure 2 It is a structural schematic diagram of a second embodiment of a header assembly of the present application; Figure 3 It is a structural schematic diagram of a third embodiment of the header assembly of the present application; Figure 4 It is a structural schematic diagram of a fourth embodiment of the header assembly of the present application; Figure 5 It is a structural schematic diagram of a fifth embodiment of the header assembly of the present application; Figure 6 A cross-sectional schematic diagram of a connection structure of a guide portion and an isolation portion; Figure 7 This is a schematic diagram of the structure of a heat exchanger of the present application. Attached photos

[0010] 100. Manifold assembly; 1. Manifold section; 2. Guide section; 11. First cavity; 12. Second cavity; 111. Opening; 21. Guide channel; 22. First connecting section; 23. Second connecting section; 3. Isolation section; 13. First end section; 14. Second end section; 31. Hole section; 25. Limiting section; 26. Tube wall; 4. Guide section; 41. Guide channel; 411. First port; 412. Second port; 5. Auxiliary connecting section; 51. Auxiliary channel; 200. Heat exchanger; 201. Heat exchange tube; 15. Plug-in interface; 202. Diverter; 2021. First port; 2022. Second port; 203. Manifold. Example

[0011] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0012] It should be understood that the words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one; "several" means two or more quantities, unless otherwise specified. The directional words such as upper, lower, left, right, front, back, inside, outside, top, bottom, etc. mentioned or may be mentioned in the text are defined relative to the structure shown in the corresponding drawings. They are relative concepts, so they may change accordingly according to their different positions and different usage states. Therefore, these or other directional terms should not be interpreted as restrictive terms. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects.

[0013] The valve device of the exemplary embodiment of the present application is described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can complement or be combined with each other.

[0014] The following is combined with Figure 1 To Attachment Figure 6 Some embodiments of the header assembly are described in detail.

[0015] like Figures 1 to 6The manifold assembly 100 includes a manifold portion 1 and a guide portion 2. The manifold portion 1 includes a first cavity 11 and a second cavity 12. The first cavity 11 includes an opening 111. The guide portion 2 includes a guide channel 21. The guide channel 21 can connect the first cavity 11 and the second cavity 12. The guide portion 2 includes a first connecting portion 22 and a second connecting portion 23. The guide channel 21 can connect the first cavity 11 through the first connecting portion 22, and the guide channel 21 can connect the second cavity 12 through the second connecting portion 23.

[0016] The manifold assembly 100 includes a partition portion 3. Along the extension direction of the manifold assembly 100, the manifold assembly includes a first end portion 13 and a second end portion 14. The partition portion 3 is arranged between the first end portion 13 and the second end portion 14. Along the extension direction of the manifold assembly 100, the first cavity 11 is located on one side of the partition portion 3, and the second cavity 12 is located on the other side of the partition portion 3. It can also be said that the partition portion 3 divides the inner cavity of the manifold portion 1 into at least the first cavity 11 and the second cavity 12. Along the extension direction of the manifold assembly 100, the partition portion 3 is closer to the second end portion 14 than the first end portion 13. In some application environments, the first end portion 13 is located above the second end portion 14. Under the action of gravity, most of the gaseous refrigerant in the gas-liquid mixed refrigerant flowing into the first cavity 11 from the opening 111 gathers near the first end portion 13, and most of the liquid refrigerant gathers near the partition portion 3. Furthermore, along the extension direction of the collecting tube assembly 100, the second connecting portion 23 is closer to the isolation portion 3 than the first connecting portion 22, and the first connecting portion 22 is closer to the first end portion 13 than the isolation portion 3. The gaseous refrigerant gathered on one side of the first end portion 13 can flow into the guide channel 21 through the first connecting portion 22, and flow out from the second connecting portion 23 into the second cavity 12. In this way, the gaseous refrigerant located in the first cavity 11 is introduced into the second cavity 12 by the guide portion 2, which effectively improves the uniformity of the gas-liquid state of the refrigerant in the first cavity and enhances the heat exchange performance of the heat exchanger.

[0017] Furthermore, the flow cross-sectional area of ​​the guide channel 21 is smaller than the flow cross-sectional area of ​​the first cavity 11 . Such a design enables the refrigerant entering the guide channel 21 through the first connecting portion 22 to quickly flow along the thinner guide channel 21 to the second connecting portion 23 , and flow out through the opening of the second connecting portion 23 .

[0018] Further, such as Figure 1The manifold assembly 100 includes a drainage portion 4, the drainage portion 4 includes a drainage channel 41, the drainage channel 41 connects the first cavity 11 and the second cavity 12, the drainage channel 41 includes a first port 411 and a second port 412, the drainage channel 41 can be connected to the first cavity 11 through the first port 411, and the drainage channel 41 can be connected to the second cavity 12 through the second port 412. Further, along the extension direction of the manifold assembly 100, the first port 411 is arranged close to the isolation portion 3. By arranging the first port 411 close to the isolation portion 3, part of the liquid refrigerant gathered on one side of the isolation portion 3 in the first cavity 11 can enter the second cavity 12 through the drainage channel 41, and the part of the liquid refrigerant can be mixed with the gaseous refrigerant introduced into the second cavity 12 through the guide portion 2, which helps to evenly mix the gas and liquid phases of the refrigerant in the second cavity 12. Furthermore, along the extension direction of the manifold assembly 100, the second port 412 is closer to the isolation portion 3 than the second connecting portion 23, and the gaseous refrigerant or gas-liquid mixed refrigerant flowing out from the outlet of the second connecting portion 23 can stir the liquid refrigerant located at the lower end of the second cavity 12, so that the gas-liquid refrigerant in the second cavity 12 is fully mixed, thereby improving the mixing uniformity of the gas-liquid refrigerant and further improving the heat exchange performance of the heat exchanger.

[0019] like Figure 4 In one embodiment of the manifold assembly 100 of the present application, the drainage channel 41 is a through hole penetrating the isolation portion 3, the first port 411 is located on the end surface of the isolation portion 3 close to the first end 13, and the second port 412 is located on the end surface of the isolation portion 3 close to the second end 14. The drainage channel 41 can be connected to the first cavity 11 through the first port 411, and the drainage channel 41 can be connected to the second cavity 12 through the second port 412. It can also be said that the first port 411 is exposed to the first cavity 11, and the second port 412 is exposed to the second cavity 12. Part of the liquid refrigerant gathered on one side of the isolation portion 3 in the first cavity 11 enters the second cavity 12 through the drainage channel 41, and the part of the liquid refrigerant can be mixed with the gaseous refrigerant introduced into the second cavity 12 through the guide portion 2, which helps to evenly mix the gas and liquid phases of the refrigerant in the second cavity 12.

[0020] like Figure 2In one embodiment of the manifold assembly 100 of the present application, the drainage portion 4 is located outside the manifold portion 1, and both ends of the drainage portion 4 are connected to the side walls of the manifold portion 1, wherein one end of the drainage portion 4 includes a first port 411, and the drainage channel 41 can be connected to the first cavity 11 through the first port 411, and the other end of the drainage portion 4 includes a second port 412, and the drainage channel 41 can be connected to the second cavity 12 through the second port 412. Along the extension direction of the manifold assembly 100, compared with the opening 111, the first port 411 is closer to the isolation portion 3. Such an arrangement can guide the liquid refrigerant gathered between the opening 111 and the isolation portion 3 out through the first port 411, and flow into the second cavity 12 along the drainage channel 41, thereby achieving the purpose of gas-liquid mixing in the second cavity 12.

[0021] like Figure 3 In one embodiment of the manifold assembly 100 of the present application, the drainage portion 4 and the drainage portion 2 are both arranged on the outside of the manifold portion 1, the two ends of the drainage portion 4 are connected to the side wall of the manifold portion 1, and the two ends of the drainage portion 2 are connected to the side wall of the manifold portion 1, wherein one end of the drainage portion 4 includes a first port 411, and the drainage channel 41 can be connected to the first cavity 11 through the first port 411, and the other end of the drainage portion 4 includes a second port 412, and the drainage channel 41 can be connected to the second cavity 12 through the second port 412, the first connecting portion 22 is located at one end of the drainage portion 2, and the second connecting portion 23 is located at the other end of the drainage portion 2, the drainage channel 21 can be connected to the first cavity 11 through the first connecting portion 22, and the drainage channel 21 can be connected to the second cavity 12 through the second connecting portion 23.

[0022] Furthermore, the volume of the first chamber 11 is greater than that of the second chamber 12. Specifically, the volume of the first chamber 11 is defined as Q1, and the volume of the second chamber 12 is defined as Q2, wherein 0.5≤Q1 / (Q1+Q2)≤0.9. Because the dryness of the refrigerant at the evaporator inlet is generally below 0.5, when the above ratio is less than 0.5, the volume of the first chamber 11 is too small, and a large amount of two-phase refrigerant will be brought into the second chamber 12, and obvious gas-liquid stratification will occur inside the refrigerant in the second chamber 12 along the gravity direction. When the ratio is greater than 0.9, the volume of the first chamber 11 is too large. Even if part of the refrigerant rises along the guide portion 2 and enters the first end portion 13 of the first chamber 11, the volume of the first chamber 11 is relatively large, and a large amount of gaseous refrigerant is gathered outside the guide portion 2. The small amount of gas-liquid mixed refrigerant drawn out of the guide portion 2 has little effect on the gaseous refrigerant, and the uneven distribution phenomenon in the first chamber 11 is still serious.

[0023] Furthermore, the flow cross-sectional area of ​​the first connecting portion 22 is greater than the flow cross-sectional area of ​​the second connecting portion 23. Such a structural arrangement helps to accelerate the refrigerant flowing from the guide channel 21 to the second connecting portion 23. The accelerated refrigerant rushes out through the second connecting portion 23, which has a certain disturbing effect on the refrigerant at the bottom of the second cavity 12, thereby improving the uniformity of the gas-liquid mixing of the refrigerant in the second cavity 12.

[0024] In some embodiments, the center line of the flow cross-sectional area of ​​the second communication portion 23 coincides with the center line of the guide portion 2, that is, the second communication portion 23 is arranged in the extension direction of the guide channel 21, which helps to increase the outflow speed of the refrigerant in the guide channel 21, so that the gas-liquid mixing effect in the second cavity 12 is better. Of course, in other embodiments, the first communication portion 22 is a plurality of communication holes arranged at intervals, and the communication holes can be circular, square, polygonal, etc., and the second communication portion 23 is a plurality of communication holes arranged along the circumference of the guide portion 2.

[0025] like Figure 1 Along the extension direction of the manifold assembly 100, the opening 111 is located between the first end portion 13 and the isolation portion 3, and is arranged closer to the isolation portion 3. In some application environments, the first end portion 13 is located above the second end portion 14. Under the action of gravity, the gaseous refrigerant in the first cavity 11 is close to the first end portion 13 and the liquid refrigerant is close to the isolation portion 3. Furthermore, along the extension direction of the manifold assembly 100, compared with the opening 111, the first port 411 is closer to the isolation portion 3. Such an arrangement can guide the liquid refrigerant gathered between the opening 111 and the isolation portion 3 out through the first port 411, and flow into the second cavity 12 along the drainage channel 41, so as to achieve the purpose of gas-liquid mixing in the second cavity 12.

[0026] In some application environments, the header assembly 100 is arranged in the vertical direction, and the first end 13 is located above the second end 14. At this time, the extension direction of the header assembly 100 is the vertical direction. Since the first connecting portion 22 is close to the first end 13, the gaseous refrigerant or the refrigerant mainly in the gaseous state gathered near the first end 13 enters the second cavity 12 through the guide channel 21, and then enters the tube cavity of the heat exchange tube connected to the second cavity 12 for heat exchange. Further, since the second connecting portion 23 is close to the second end 14, the gaseous refrigerant or the refrigerant mainly in the gaseous state flowing out of the second connecting portion 23 has a disturbing effect on the refrigerant in the second cavity 12, which is conducive to further mixing of the refrigerant in the second cavity 12 and improving the heat exchange efficiency of the heat exchanger. Furthermore, the drainage portion 4 extends in the vertical direction, that is, the first port 411 is located above the isolation portion 3, and the second port 412 is located below the isolation portion 3, and in the vertical direction, the height of the first port 411 is not higher than the opening 111 and the second port 412 is higher than the second connecting portion 23, which is beneficial for guiding the liquid refrigerant or the mainly liquid refrigerant in the lower part of the first cavity 11 to the second cavity 12, realizing the redistribution of the refrigerant in the two cavities of the manifold assembly 100, and helping to improve the heat exchange performance of the heat exchanger.

[0027] like Figure 5 In one embodiment of the manifold assembly 100 of the present application, the manifold assembly 100 includes an auxiliary connecting portion 5, the auxiliary connecting portion 5 includes an auxiliary channel 51, the auxiliary channel 51 connects the first cavity 11 and the second cavity 12, and one end of the auxiliary channel 51 connecting the first cavity 11 is arranged near the first end portion 13. Furthermore, the flow cross-sectional area of ​​the auxiliary channel 51 is smaller than the flow cross-sectional area of ​​the guide channel 21. When the refrigerant flow entering from the opening 111 is large, the guide portion 2 and the auxiliary connecting portion 5 can simultaneously introduce the gaseous refrigerant or the refrigerant mainly in the gaseous state in the first cavity 11 into the second cavity 12, thereby enhancing the redistribution effect of the refrigerant in the first cavity 11 and the second cavity 12, thereby improving the heat exchange performance of the heat exchanger.

[0028] like Figure 6 Further, the flow guide 2 includes a tube wall 26 and a limiting portion 25. Along the radial direction of the flow guide 2, the limiting portion 25 protrudes from the tube wall 26 of the flow guide 2. The limiting portion 25 is arranged along the circumferential direction of the flow guide 2. The outer diameter of the limiting portion 25 is greater than the outer diameter of the tube wall 26 of the flow guide 2. Specifically, the limiting portion 25 is formed by extruding the flow guide 2 from both sides. The flow guide 2 can be connected by limiting the limiting portion 25 and the hole portion 31. Further, the isolation portion 3 is fixedly connected to the manifold 1. The flow guide 2 is located in the manifold 1. The manifold 1 includes a mounting groove portion (not shown in the figure). Along the extension direction of the manifold assembly 100, the mounting groove portion is closer to the second end portion 14 than the opening 111. At least part of the isolation portion 3 passes through the mounting groove portion to achieve fixed connection with the manifold 1.

[0029] The following is combined with Figure 7 An embodiment of a heat exchanger is described in detail.

[0030] like Figure 7 The heat exchanger 200 includes a plurality of heat exchange tubes 201 and a header assembly 100. The structure and working principle of the header assembly 100 refer to the header assembly 100 introduced above and will not be repeated here.

[0031] like Figure 7 The heat exchange tubes 201 are arranged along the extension direction of the header assembly 100. Specifically, a plurality of plug-in ports 15 are provided on the side of the header 1 facing away from the outlet 111. One end of the heat exchange tube 201 is inserted into the plug-in port 15. The heat exchange tubes 201 are arranged along the extension direction of the header assembly 100. The heat exchange tubes 201 include refrigerant channels (not shown in the figure). The refrigerant channels of some of the heat exchange tubes 201 are connected to the first cavity 11, and the refrigerant channels of another part of the heat exchange tubes 201 are connected to the second cavity 12, so as to achieve the purpose of collecting or distributing the header 1.

[0032] Further, the heat exchanger 200 includes a plurality of header assemblies 100 and a flow divider 202, the flow divider 202 includes a first port 2021 and a plurality of second ports 2022, the first port 2021 is connected to the second port 2022, and the second port 2022 is connected to the openings 111 of the plurality of header assemblies 100, so that the refrigerant flowing in from the first port 2021 can be distributed to each header assembly 100, further, the plurality of header assemblies 100 are coaxially arranged, that is, the extension direction of the header assemblies 100 is the same, further, the plurality of header assemblies 100 are connected end to end, that is, the first end 13 of one header assembly 100 and the adjacent first end 13 of another header assembly 100 are connected to each other. The second end 14 of a manifold assembly 100 is relatively arranged or fixedly connected or is an integral structure. Specifically, in some embodiments, there is a spacing between two adjacent manifold assemblies 100, and other components can be arranged within the spacing, of course, other components may not be arranged; in some embodiments, two adjacent manifold assemblies 100 are fixedly connected by welding, clamping, etc.; in other embodiments, two adjacent manifold assemblies 100 are divided into two manifold assemblies 100 by an isolation piece, that is, the first end 13 of one manifold assembly 100 and the second end 14 of another manifold assembly 100 can be the same component.

[0033] Furthermore, the heat exchanger 200 also includes a header 203, and the other end of the heat exchange tube 201 is connected to the header 203. In some embodiments, the header 203 and the header assembly 100 are arranged in parallel, and the extension direction of the two is consistent with the stacking direction of the heat exchange tube 201.

[0034] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A header assembly, characterized in that: The invention comprises a manifold (1) and a flow guide portion (2), wherein the manifold (1) comprises a first cavity (11) and a second cavity (12), the flow guide portion (2) comprises a flow guide channel (21), the flow guide portion (2) comprises a first connecting portion (22) and a second connecting portion (23), the flow guide channel (21) can be connected to the first cavity (11) via the first connecting portion (22), and the flow guide channel (21) can be connected to the second cavity (12) via the second connecting portion (23); Along the extension direction of the manifold assembly, the manifold assembly includes a first end (13) and a second end (14), the manifold assembly includes an isolation portion (3), the first cavity (11) is located on one side of the isolation portion (3), and the second cavity (12) is located on the other side of the isolation portion (3), and along the extension direction of the manifold assembly, the first connecting portion (22) is closer to the first end (13) than to the isolation portion (3).

2. The header assembly according to claim 1, characterized in that The manifold assembly comprises a drainage portion (4), the drainage portion (4) comprises a drainage channel (41), the drainage channel (41) comprises a first port (411) and a second port (412), the drainage channel (41) can be communicated with the first cavity (11) through the first port (411), and the drainage channel (41) can be communicated with the second cavity (12) through the second port (412), and along the extension direction of the manifold assembly, the first port (411) is arranged close to the isolation portion (3).

3. The header assembly according to claim 2, characterized in that The flow cross-sectional area of ​​the first connecting portion (22) is greater than the flow cross-sectional area of ​​the second connecting portion (23); along the extension direction of the header assembly, the second port (412) is closer to the isolation portion (3) than the second connecting portion (23).

4. The header assembly according to any one of claims 1 to 3, characterized in that: Along the extension direction of the manifold assembly, the second end (14) is closer to the isolation portion (3) than the first end (13), and the volume of the first cavity 11 is defined as Q1, and the volume of the second cavity 12 is defined as Q2, wherein 0.5≤Q1 / (Q1+Q2)≤0.

9.

5. The header assembly according to claim 4, characterized in that The manifold assembly comprises an auxiliary connecting portion (5), the auxiliary connecting portion (5) comprising an auxiliary channel (51), the auxiliary channel (51) connecting the first cavity (11) and the second cavity (12), one end of the auxiliary channel (51) connecting the first cavity (11) being arranged close to the first end portion (13), and a flow cross-sectional area of ​​the auxiliary channel (51) being smaller than a flow cross-sectional area of ​​the guide channel (21).

6. The header assembly according to any one of claims 1 to 5, characterized in that: The isolating portion (3) comprises a hole portion (31), the hole portion (31) passing through the isolating portion (3), the flow guiding portion (2) comprises a tube wall (26) and a limiting portion (25), and along the radial direction of the flow guiding portion (2), the limiting portion (25) protrudes from the tube wall (26), and the flow guiding portion (2) can be connected in a limiting manner through the limiting portion (25) and the hole portion (31).

7. The header assembly according to claim 6, characterized in that The isolating portion (3) is fixedly connected to the manifold portion (1), the flow guide portion (2) is located in the manifold portion (1), the manifold portion (1) comprises a mounting groove portion, and along the extension direction of the manifold assembly, the mounting groove portion is closer to the second end portion (14) than the opening (111), and at least a portion of the isolating portion (3) passes through the mounting groove portion.

8. A heat exchanger, characterized in that: The heat exchange tubes (201) are provided with a plurality of heat exchange tubes (201) and a header assembly (100), wherein the header assembly (100) comprises a header portion (1), wherein the header portion (1) comprises a first cavity (11) and a second cavity (12), wherein the heat exchange tubes (201) are arranged along the extension direction of the header assembly (100), and wherein the heat exchange tubes (201) comprise refrigerant channels, wherein the refrigerant channels of some of the heat exchange tubes (201) are connected to the first cavity (11), and the refrigerant channels of another part of the heat exchange tubes (201) are connected to the second cavity (12); The manifold assembly (100) comprises a flow guide portion (2), the flow guide portion (2) comprises a flow guide channel (21), the flow guide portion (2) comprises a first connecting portion (22) and a second connecting portion (23), the flow guide channel (21) can be connected to the first cavity (11) through the first connecting portion (22), and the flow guide channel (21) can be connected to the second cavity (12) through the second connecting portion (23); Along the extension direction of the manifold assembly (100), the manifold assembly (100) includes a first end (13) and a second end (14), the manifold assembly (100) includes an isolation portion (3), the first cavity (11) is located on one side of the isolation portion (3), and the second cavity (12) is located on the other side of the isolation portion (3), and along the extension direction of the manifold assembly (100), the first connecting portion (22) is closer to the first end (13) than to the isolation portion (3).

9. The heat exchanger according to claim 8, characterized in that The manifold assembly (100) comprises a drainage portion (4), the drainage portion (4) comprises a drainage channel (41), the drainage channel (41) comprises a first port (411) and a second port (412), the drainage channel (41) can be in communication with the first cavity (11) via the first port (411), and the drainage channel (41) can be in communication with the second cavity (12) via the second port (412), and along the extension direction of the manifold assembly, the first port (411) is arranged close to the isolation portion (3).

10. The heat exchanger according to claim 8 or 9, characterized in that: The heat exchanger comprises a plurality of the header assemblies (100) and a flow divider (202); the flow divider (202) comprises a first port (2021) and a plurality of second ports (2022); the first port (2021) is connected to the second port (2022); the second port (2022) is connected to the openings (111) of the plurality of the header assemblies (100); a first end portion (13) of one of the header assemblies (100) and a second end portion (14) of another adjacent header assembly (100) are arranged relative to each other or are fixedly connected or are an integral structure.

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