Micro-channel heat exchanger

Abstract

The present application provides a micro-channel heat exchanger, comprising a header assembly, an exhaust structure, and a plurality of heat exchange flat tubes. The plurality of heat exchange flat tubes are all in communication with the header assembly. The exhaust structure is mounted on the header assembly. The exhaust structure is provided with an exhaust cavity, and the exhaust cavity is in communication with a cavity body of the header assembly. The exhaust structure has an exhaust state and a closed state. In the closed state, the exhaust cavity is isolated from the outside of the micro-channel heat exchanger, and in the exhaust state, the exhaust cavity is in communication with the outside of the micro-channel heat exchanger, so as to discharge air from the header assembly. In the present solution, by means of the plurality of heat exchange flat tubes in communication with the header assembly, a heat exchange medium can be more evenly distributed into the heat exchange flat tubes, thereby helping to improve heat exchange efficiency. The exhaust structure can be in communication with the outside by means of the exhaust cavity, and can effectively discharge air from the header assembly in the exhaust state, thereby avoiding accumulation of air in the header assembly, and avoiding a reduction in heat exchange efficiency caused by air retention.

Description

microchannel heat exchanger

[0001] This application claims priority to the patent application filed on December 27, 2024, with application number 202423268446.0 and entitled "Microchannel Heat Exchanger". Technical Field

[0002] This application relates to the field of heat exchanger technology, and more specifically, to a microchannel heat exchanger. Background Technology

[0003] Microchannel heat exchangers have advantages such as high energy efficiency, large heat transfer coefficient, small size and good heat transfer performance, and are therefore widely used in air conditioning, new energy vehicles and other fields.

[0004] However, the existing microchannel heat exchanger's manifold is a closed structure. After the manifold is installed with the system, the air inside the system cannot be discharged. The presence of air results in a small amount of heat exchange medium being charged inside the heat exchanger system, which affects the heat exchange efficiency.

[0005] Application content

[0006] This application provides a microchannel heat exchanger to solve the problem that existing microchannel heat exchangers cannot exhaust air.

[0007] To address the aforementioned issues, this application provides a microchannel heat exchanger, comprising a manifold assembly, an exhaust structure, and multiple heat exchange flat tubes. The multiple heat exchange flat tubes are spaced apart along the length of the manifold assembly and are connected to the manifold assembly. The exhaust structure is installed on the manifold assembly and has an exhaust chamber that is connected to the cavity of the manifold assembly. The exhaust structure has an exhaust state and a closed state. In the closed state, the exhaust chamber is isolated from the outside of the microchannel heat exchanger. In the exhaust state, the exhaust chamber is connected to the outside of the microchannel heat exchanger to discharge air from the manifold assembly.

[0008] Furthermore, the exhaust structure includes a connecting cylinder and a plug. The connecting cylinder and the flow collection assembly are fixedly connected. The cavity of the connecting cylinder forms an exhaust chamber, which has an exhaust port. In the closed state, the plug blocks the exhaust port, and in the exhaust state, the plug avoids the exhaust port.

[0009] Furthermore, the plug and connecting sleeve are detachably threaded together to allow the venting structure to be in either a venting or closed state.

[0010] Furthermore, the inner wall of the exhaust chamber has internal threads, and the plug includes an end cap and a sealing post that are connected to each other. The radial dimension of the end cap is larger than the radial dimension of the sealing post. The sealing post has external threads, and the sealing post and the connecting cylinder are threadedly connected. When the sealing post and the connecting cylinder are threadedly connected, the end face of the end cap and the end face of the connecting cylinder abut against each other.

[0011] Furthermore, the axial dimension of the exhaust chamber is X, and the axial dimension of the sealing column is L; wherein, X > L, and / or 7mm ≤ L ≤ 10mm.

[0012] Furthermore, the plug has a blind hole, the inner circumferential surface of which is a polygonal surface; or the outer circumference of the plug has a polygonal surface.

[0013] Furthermore, the connecting cylinder includes a first cylinder section and a second cylinder section connected to each other. The outer diameter of the first cylinder section is larger than the outer diameter of the second cylinder section. The first cylinder section is sleeved on the end of the flow collecting assembly and connected to the flow collecting assembly. The cavity of the second cylinder section forms an exhaust cavity.

[0014] Furthermore, the connecting cylinder is a straight cylinder, and a connecting port is provided on the side wall of the current collection assembly. One end of the straight cylinder passes through the connecting port and connects with the inner wall of the connecting port, while the other end of the straight cylinder is connected to the plug.

[0015] Furthermore, the exhaust structure also includes an adapter seat, and the connecting cylinder is fixedly connected to the collector assembly through the adapter seat; wherein, the adapter seat has a planar connecting surface and an arc-shaped connecting surface arranged opposite to each other, the connecting cylinder is fixed to the planar connecting surface, the arc-shaped connecting surface is welded to the arc-shaped outer surface of the collector assembly, and the cavity of the collector assembly, the cavity of the adapter seat and the exhaust cavity are connected in sequence.

[0016] Furthermore, the exhaust structure also includes an annular seal, which is arranged around the exhaust port and sandwiched between the connecting cylinder and the plug.

[0017] Furthermore, the plug and the connecting cylinder are snapped together; or, the plug and the connecting cylinder are not connected before the exhaust chamber is vented, and the plug and the connecting cylinder are welded together after the exhaust chamber is vented.

[0018] Furthermore, the manifold assembly includes a manifold pipe, a liquid reservoir, and a connecting structure. The liquid reservoir is connected to the manifold pipe via the connecting structure, and multiple heat exchange flat tubes are connected to the manifold pipe. The exhaust structure is installed on the manifold pipe and / or the exhaust structure.

[0019] In this design, multiple heat exchange flat tubes connected to the manifold allow for more even distribution of the heat exchange medium within each tube, improving heat exchange efficiency. The flat tubes are connected by fins, enabling the microchannel heat exchanger to achieve a large heat exchange area even in space-constrained conditions, further enhancing heat exchange performance. The exhaust structure, connected to the outside via an exhaust chamber, effectively removes air from the manifold, preventing air accumulation and reducing the amount of heat exchange medium required, thus avoiding a decrease in heat exchange efficiency due to air retention. Inside the microchannel heat exchanger, the presence of air can cause condensate to accumulate in cooler air regions. Expelling this air through the exhaust structure effectively reduces condensate buildup in the manifold, preventing its negative effects on the microchannel heat exchanger, maintaining stable operation, and preventing corrosion caused by moisture accumulation. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 shows a schematic diagram of the microchannel heat exchanger provided in Embodiment 1 of this application;

[0022] Figure 2 shows a schematic diagram of the exhaust structure of the microchannel heat exchanger provided in Embodiment 1 of this application;

[0023] Figure 3 shows a cross-sectional view of the exhaust structure of the microchannel heat exchanger provided in Embodiment 1 of this application;

[0024] Figure 4 shows a schematic diagram of the liquid reservoir of the microchannel heat exchanger provided in Embodiment 2 of this application;

[0025] Figure 5 shows a schematic diagram of the exhaust structure of the microchannel heat exchanger provided in Embodiment 3 of this application;

[0026] Figure 6 shows a schematic diagram of the exhaust structure of the microchannel heat exchanger provided in Embodiment 4 of this application;

[0027] Figure 7 shows a schematic diagram of the exhaust structure of the microchannel heat exchanger provided in Embodiment 5 of this application.

[0028] The above-mentioned figures include the following reference numerals: 10, manifold assembly; 11, manifold pipe; 12, liquid reservoir; 13, connecting structure; 20, venting structure; 21, venting chamber; 22, connecting cylinder; 221, first cylinder section; 222, second cylinder section; 23, plug; 231, end cap; 232, sealing post; 233, blind hole; 24, adapter seat; 241, planar connecting surface; 242, arc-shaped connecting surface; 25, annular seal; 30, heat exchange flat tube. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] As shown in Figures 1 to 3, Embodiment 1 of this application provides a microchannel heat exchanger, including a flow collection assembly 10, an exhaust structure 20, and multiple heat exchange flat tubes 30. The multiple heat exchange flat tubes 30 are spaced apart along the length direction of the flow collection assembly 10 and are connected to the flow collection assembly 10. The exhaust structure 20 is installed on the flow collection assembly 10 and has an exhaust chamber 21. The exhaust chamber 21 is connected to the cavity of the flow collection assembly 10. The exhaust structure 20 has an exhaust state and a closed state. In the closed state, the exhaust chamber 21 is isolated from the outside of the microchannel heat exchanger. In the exhaust state, the exhaust chamber 21 is connected to the outside of the microchannel heat exchanger to exhaust the air in the flow collection assembly 10.

[0031] In some embodiments, by connecting multiple heat exchange flat tubes 30 to the manifold 10, the heat exchange medium can be more evenly distributed to each heat exchange flat tube, which helps to improve heat exchange efficiency. The exhaust structure 20 can be connected to the outside through the exhaust chamber 21, effectively expelling air from the manifold 10 in the exhaust state, preventing air accumulation inside the manifold 10, which would reduce the amount of heat exchange medium charged inside the heat exchanger system and avoid a decrease in heat exchange efficiency due to air retention. Inside the microchannel heat exchanger, if some air is present, condensate tends to accumulate in the lower-temperature air regions. Expelling the air through the exhaust structure 20 can effectively reduce condensate accumulation in the manifold 10, preventing the effects of condensate inside the microchannel heat exchanger, maintaining stable operation of the heat exchanger, and avoiding corrosion caused by moisture accumulation.

[0032] The heat exchange flat tubes 30 are connected by fins, which enables the microchannel heat exchanger to achieve a large heat exchange area even when space is limited, thus improving the heat exchange effect.

[0033] As shown in Figures 2 and 3, the exhaust structure 20 includes a connecting cylinder 22 and a plug 23. The connecting cylinder 22 is fixedly connected to the flow collection assembly 10. The cavity of the connecting cylinder 22 forms an exhaust chamber 21, which has an exhaust port. In the closed state, the plug 23 blocks the exhaust port, and in the exhaust state, the plug 23 avoids the exhaust port.

[0034] In some embodiments, the air inside the manifold 10 is discharged by blocking or avoiding the exhaust port on the exhaust chamber 21 using a plug 23. In the closed state, the plug 23 blocks the exhaust port, isolating the exhaust chamber 21 from the outside environment and preventing external air or impurities from entering the microchannel heat exchanger, ensuring that the manifold 10 is not affected by the external environment. In the venting state, the plug 23 avoids the exhaust port, allowing air in the manifold 10 to be discharged through the exhaust port, enabling the accumulated air to be quickly discharged and preventing air stagnation that could lead to condensate accumulation, reduced heat exchange medium charge, and decreased heat exchange efficiency.

[0035] In some embodiments, the plug 23 and the connecting cylinder 22 are detachably threaded together to allow the exhaust structure 20 to be in an exhaust or closed state. In some embodiments, the threaded connection between the plug and the connecting cylinder provides higher structural strength and improves sealing performance. In the closed state, the plug 23 is tightly engaged with the connecting cylinder 22 via threads, effectively preventing the entry of outside air or other gases, ensuring the isolation of the exhaust chamber 21 from the outside environment, and maintaining the efficient operation of the microchannel heat exchanger. Furthermore, the threaded connection allows for easy disassembly of the connection between the plug 23 and the connecting cylinder 22. When maintenance, cleaning, or repair is required, the plug 23 can be easily removed by simply rotating it, reducing downtime and improving heat exchange efficiency.

[0036] In some embodiments, the inner wall of the exhaust chamber 21 has internal threads, and the plug 23 includes an end cap 231 and a sealing post 232 connected to each other. The radial dimension of the end cap 231 is larger than the radial dimension of the sealing post 232. The sealing post 232 has external threads, and the sealing post 232 and the connecting cylinder 22 are threadedly connected. When the sealing post 232 and the connecting cylinder 22 are threadedly connected, the end face of the end cap 231 and the end face of the connecting cylinder 22 abut against each other.

[0037] In some embodiments, the external thread of the sealing column 232 engages with the internal thread of the inner wall of the exhaust chamber 21, ensuring a tight seal between the plug 23 and the connecting cylinder 22. With the threaded connection between the sealing column 232 and the connecting cylinder 22, the entry of outside air is effectively prevented, ensuring the efficient operation of the microchannel heat exchanger. The radial dimension of the end cap 231 is larger than that of the sealing column 232, and the end face of the end cap 231 abuts against the end face of the connecting cylinder 22, further enhancing the sealing effect in the closed state and ensuring the stability of the plug 23, effectively preventing the entry of external air or contaminants during the operation of the microchannel heat exchanger.

[0038] Specifically, the axial dimension of the exhaust chamber 21 is X, and the axial dimension of the sealing column 232 is L; wherein X > L, and / or 7mm ≤ L ≤ 10mm.

[0039] In some embodiments, the axial dimension X of the exhaust chamber 21 is greater than the axial dimension L of the sealing column 232, which can prevent the sealing column 232 from extending into the cavity of the collector assembly 10, thereby occupying space within the collector assembly 10 and affecting the amount of heat exchange medium charged.

[0040] As shown in Figure 2, the plug 23 has a blind hole 233, the inner circumferential surface of which is a polygonal surface; or the outer circumference of the plug 23 has a polygonal surface.

[0041] In some embodiments, the outer periphery of the plug 23 or the inner periphery of the blind hole 233 adopts a polygonal surface structure, which can increase the contact surface between the plug 23 and the disassembly tool, enabling precise matching with the shape of the mating tool and avoiding slippage or sliding problems that may occur on a circular contact surface. Moreover, the polygonal surface not only provides a larger contact area, but also effectively disperses external forces, allowing the plug 23 to evenly distribute the load when subjected to pressure, vibration, or external forces, avoiding excessive local stress that could lead to damage or deformation, improving the pressure resistance and durability of the plug 23, and extending its service life.

[0042] As shown in Figure 2, the connecting cylinder 22 includes a first cylinder section 221 and a second cylinder section 222 that are connected to each other. The outer diameter of the first cylinder section 221 is larger than the outer diameter of the second cylinder section 222. The first cylinder section 221 is sleeved on the end of the current collecting assembly 10 and connected to the current collecting assembly 10, for example by welding. The cavity of the second cylinder section 222 forms an exhaust cavity 21.

[0043] In some embodiments, the outer diameter of the first cylindrical section 221 is larger than the outer diameter of the second cylindrical section 222, which effectively fixes the connecting cylinder 22 to the end of the manifold 10 and tightly connects the two by welding. This prevents the connection from loosening or leaking under high pressure or high temperature conditions, improves the overall sealing of the microchannel heat exchanger, and ensures that external gas does not enter the manifold. By designing the first cylindrical section 221 and the second cylindrical section 222 as two connecting sections, the overall design is simplified. Welding replaces bolts or threaded connections, which not only reduces the number of parts but also reduces the risk of loose connections, resulting in a more compact and simpler overall structure. Moreover, the cavity of the second cylindrical section 222 forms an exhaust chamber 21, ensuring that the exhaust chamber 21 has sufficient space to effectively discharge air from the manifold 10, preventing airflow stagnation and ensuring the heat exchange efficiency of the microchannel heat exchanger.

[0044] As shown in Figure 3, the exhaust structure 20 also includes an annular seal 25, which is arranged around the exhaust port and sandwiched between the connecting cylinder 22 and the plug 23.

[0045] In some embodiments, the annular seal 25 enables a tight seal between the plug 23 and the connecting cylinder 22, preventing outside air from entering the exhaust chamber 21 between the plug 23 and the connecting cylinder 22. Since the annular seal 25 surrounds the exhaust port, it improves the overall sealing performance. Furthermore, the annular seal 25 can mitigate vibration between the connecting cylinder 22 and the plug 23, avoiding the impact of vibration on the interface and reducing seal damage caused by vibration.

[0046] As shown in Figures 1 and 4, the manifold assembly 10 includes a manifold 11, a liquid reservoir 12, and a connecting structure 13. The liquid reservoir 12 is connected to the manifold 11 via the connecting structure 13, and multiple heat exchange flat tubes 30 are also connected to the manifold 11. An exhaust structure 20 is installed on the manifold 11 and / or on the liquid reservoir 12. In this design, the manifold 11 is connected to multiple heat exchange flat tubes 30 to ensure that the heat exchange medium can flow effectively through the heat exchange flat tubes 30, thereby improving heat exchange efficiency.

[0047] As shown in Figure 1, when the exhaust structure 20 is installed in the manifold 11, it can effectively exhaust the air in the manifold 11, preventing gas from stagnating in the manifold 11 and avoiding the impact on heat exchange efficiency due to air blockage. The connection structure 13 between the liquid reservoir 12 and the manifold 11 ensures that the heat exchange medium can be evenly distributed and circulate throughout the entire microchannel heat exchanger.

[0048] As shown in Figure 4, in Embodiment 2 of this solution, the exhaust structure 20 can also be installed on the liquid reservoir 12, which can also prevent the accumulation of gas in the liquid reservoir 12. This makes the circulation efficiency of the heat exchange medium higher, and further improves the performance and flexibility of the entire microchannel heat exchanger.

[0049] As shown in Figure 5, in the third embodiment provided in this solution, the connecting cylinder 22 is a straight cylinder, and a connection port is provided on the side wall of the current collection assembly 10. One end of the straight cylinder passes through the connection port and is connected to the inner wall of the connection port, for example by welding. The other end of the straight cylinder is connected to the plug 23.

[0050] The connecting cylinder 22 is designed in a straight cylindrical shape, with one end welded to the inner wall of the connection port of the manifold 10. This welded connection eliminates the gap between the straight cylinder and the connection port, preventing air from entering the manifold 10 through the gap. Furthermore, designing the connecting cylinder 22 in a straight cylindrical shape allows it to be installed anywhere on the manifold 10 without being limited by its position or number. Multiple connecting cylinders 22 can be spaced out, improving the overall flexibility and heat exchange efficiency of the microchannel heat exchanger.

[0051] As shown in Figure 6, in the fourth embodiment provided by this solution, the exhaust structure 20 further includes an adapter 24, and the connecting cylinder 22 is fixedly connected to the flow collection assembly 10 through the adapter 24; wherein, the adapter 24 has a planar connecting surface 241 and an arc-shaped connecting surface 242 arranged opposite to each other, the connecting cylinder 22 is fixed to the planar connecting surface 241, the arc-shaped connecting surface 242 is welded to the arc-shaped outer surface of the flow collection assembly 10, and the cavity of the flow collection assembly 10, the cavity of the adapter 24 and the exhaust cavity 21 are connected in sequence.

[0052] The connection between the connecting cylinder 22 and the manifold 10 is more secure through the adapter 24. The flat connecting surface 241 of the adapter 24 is fixed to the connecting cylinder 22, and the arc-shaped connecting surface 242 is welded to the arc-shaped outer surface of the manifold 10. This ensures the strength and durability of the connecting components, reduces the problem of loosening due to vibration or temperature changes, improves the stability of the microchannel heat exchanger, and also improves the sealing performance. The arc-shaped connecting surface 242 of the adapter 24 increases the contact area with the manifold 10. The smooth connection between the adapter 24, the manifold 10, and the connecting cylinder 22 avoids possible complex connections and corner problems.

[0053] As shown in Figure 7, in Embodiment 5 of this scheme, the plug 23 and the connecting cylinder 22 are not connected before the exhaust chamber 21 exhausts, and the plug 23 and the connecting cylinder 22 are welded after the exhaust chamber 21 exhausts.

[0054] Before venting from the exhaust chamber 21, the plug 23 and the connecting cylinder 22 are not connected. After venting from the exhaust chamber 21, the plug 23 and the connecting cylinder 22 are welded together. This allows air or liquid in the manifold 10 to be vented before installation, enabling the entire venting process to be carried out independently. Afterward, the plug 23 and the connecting cylinder 22 are welded together without affecting other operating steps. This ensures higher sealing performance and greater structural stability of the microchannel heat exchanger. Furthermore, not welding before venting provides greater flexibility in complex situations, allowing for more precise positioning and adjustment.

[0055] Alternatively, in some embodiments, the plug 23 and the connecting cylinder 22 are snap-fitted together. This snap-fit ​​connection simplifies the assembly process, reduces unnecessary installation steps, and decreases reliance on complex processes. This improves production efficiency, shortens assembly time, and reduces the likelihood of errors during assembly.

[0056] The microchannel heat exchanger provided by the above solution achieves effective air discharge from the heat exchanger by setting a switchable exhaust structure 20 in the manifold 10, avoiding the impact of air accumulation on heat exchange efficiency. In the exhaust state, air can smoothly exit from the exhaust chamber 21, while in the closed state, the exhaust chamber 21 is isolated from the external environment, ensuring the heat exchanger's airtightness. This design not only simplifies the heat exchanger's structure but also improves its operational stability and efficiency, enhancing the performance of the refrigeration or heating system. Furthermore, by setting different sizes, connection methods, and positions of the exhaust structure 20, the microchannel heat exchanger of this solution can better adapt to various working environments and operating conditions, such as heat exchange requirements in special environments like high temperature, high pressure, or corrosive environments.

[0057] The above description is merely an optional embodiment of this solution and is not intended to limit the solution. Various modifications and variations can be made to this solution by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this solution should be included within the scope of protection of this solution.

Claims

1. A microchannel heat exchanger, characterized in that, The device includes a flow collection assembly (10), an exhaust structure (20), and multiple heat exchange flat tubes (30). The multiple heat exchange flat tubes (30) are spaced apart along the length of the flow collection assembly (10) and are connected to the flow collection assembly (10). The exhaust structure (20) is installed on the flow collection assembly (10) and has an exhaust chamber (21). The exhaust chamber (21) is connected to the cavity of the flow collection assembly (10). The exhaust structure (20) has an exhaust state and a closed state. In the closed state, the exhaust chamber (21) is isolated from the outside of the microchannel heat exchanger. In the exhaust state, the exhaust chamber (21) is connected to the outside of the microchannel heat exchanger to exhaust the air in the flow collection assembly (10).

2. The micro-channel heat exchanger of claim 1, wherein, The exhaust structure (20) includes a connecting cylinder (22) and a plug (23). The connecting cylinder (22) and the flow collection assembly (10) are fixedly connected. The cavity of the connecting cylinder (22) forms the exhaust chamber (21), which has an exhaust port. In the closed state, the plug (23) blocks the exhaust port, and in the exhaust state, the plug (23) avoids the exhaust port.

3. The microchannel heat exchanger according to claim 2, characterized in that, The plug (23) and the connecting cylinder (22) are detachably threaded together so that the venting structure (20) is in the venting state or the closed state.

4. The micro-channel heat exchanger of claim 3, wherein, The inner wall of the exhaust chamber (21) has internal threads. The plug (23) includes an end cap (231) and a sealing post (232) connected to each other. The radial dimension of the end cap (231) is larger than the radial dimension of the sealing post (232). The sealing post (232) has external threads. The sealing post (232) and the connecting cylinder (22) are threadedly connected. When the sealing post (232) and the connecting cylinder (22) are threadedly connected, the end face of the end cap (231) and the end face of the connecting cylinder (22) abut against each other.

5. The microchannel heat exchanger according to claim 4, characterized in that, The axial dimension of the exhaust chamber (21) is X, and the axial dimension of the sealing column (232) is L; wherein X > L, and / or 7mm ≤ L ≤ 10mm.

6. The microchannel heat exchanger according to claim 3, characterized in that, The plug (23) has a blind hole (233), and the inner circumferential surface of the blind hole (233) is a polygonal surface; Or the outer periphery of the plug (23) has a polygonal surface.

7. The micro-channel heat exchanger of claim 2, wherein, The connecting cylinder (22) includes a first cylinder section (221) and a second cylinder section (222) connected to each other. The outer diameter of the first cylinder section (221) is larger than the outer diameter of the second cylinder section (222). The first cylinder section (221) is sleeved on the end of the flow collecting assembly (10) and connected to the flow collecting assembly (10). The cavity of the second cylinder section (222) forms the exhaust cavity (21).

8. The microchannel heat exchanger according to claim 2, characterized in that, The connecting cylinder (22) is a straight cylinder. A connection port is provided on the side wall of the collector assembly (10). One end of the straight cylinder passes through the connection port and is connected to the inner wall of the connection port. The other end of the straight cylinder is connected to the plug (23).

9. The microchannel heat exchanger according to claim 2, characterized in that, The exhaust structure (20) further includes an adapter (24), and the connecting cylinder (22) is fixedly connected to the flow collection assembly (10) through the adapter (24); wherein, the adapter (24) has a planar connecting surface (241) and an arc-shaped connecting surface (242) arranged opposite to each other, the connecting cylinder (22) is fixed to the planar connecting surface (241), the arc-shaped connecting surface (242) is welded to the arc-shaped outer surface of the flow collection assembly (10), and the cavity of the flow collection assembly (10), the cavity of the adapter (24) and the exhaust cavity (21) are connected in sequence.

10. The microchannel heat exchanger according to any one of claims 2 to 9, characterized in that, The exhaust structure (20) further includes an annular seal (25) which is arranged around the exhaust port and sandwiched between the connecting cylinder (22) and the plug (23).

11. The microchannel heat exchanger according to claim 2, characterized in that, The plug (23) and the connecting cylinder (22) are engaged; Alternatively, the plug (23) and the connecting cylinder (22) may not be connected before the exhaust chamber (21) is vented, and the plug (23) and the connecting cylinder (22) may be welded after the exhaust chamber (21) is vented.

12. The micro-channel heat exchanger of claim 1, wherein, The manifold assembly (10) includes a manifold (11), a reservoir (12), and a connecting structure (13). The reservoir (12) is connected to the manifold (11) through the connecting structure (13), and multiple heat exchange flat tubes (30) are connected to the manifold (11). The exhaust structure (20) is installed on the manifold (11), and / or the exhaust structure (20) is installed on the reservoir (12).

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