Micro-channel heat exchanger

Abstract

The utility model provides a microchannel heat exchanger which comprises a flow collecting assembly, an exhaust structure and a plurality of heat exchange flat pipes, the heat exchange flat pipes are all communicated with the flow collecting assembly, the exhaust structure is installed on the flow collecting assembly, the exhaust structure is provided with an exhaust cavity, the exhaust cavity is communicated with a cavity body of the flow collecting assembly, and the exhaust structure has an exhaust state and a closed state. And 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 communicates with the outside of the micro-channel heat exchanger, so that air in the flow collecting assembly is exhausted. According to the scheme, the multiple heat exchange flat pipes are communicated with the flow collecting assembly, heat exchange media can be distributed into the heat exchange flat pipes more evenly, and the heat exchange efficiency can be improved. The exhaust structure can communicate with the outside through the exhaust cavity, air in the flow collecting assembly can be effectively exhausted in the exhaust state, air accumulation in the flow collecting assembly is avoided, and the situation that the heat exchange efficiency is reduced due to air retention is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat exchanger technical field, specifically, relate to a kind of microchannel heat exchanger. BACKGROUND

[0002] Microchannel heat exchanger has the advantages of high energy efficiency, high heat transfer coefficient, small volume, good heat transfer performance, and thus has a wide application in air conditioning, new energy vehicles and other fields.

[0003] But the current microchannel heat exchanger's current collection assembly is all closed structure, after installing the current collection assembly of heat exchanger with system, air in system cannot be discharged, the existence of air causes the heat exchange medium filling amount in heat exchanger system to be less, influence heat exchange efficiency. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of microchannel heat exchanger to solve the problem of air discharge in prior art microchannel heat exchanger.

[0005] To solve the above problems, the utility model provides a kind of microchannel heat exchanger, including current collection assembly, exhaust structure and multiple heat exchange flat tubes, multiple heat exchange flat tubes are interval arranged along the length direction of current collection assembly, and communicate with current collection assembly, exhaust structure is installed in current collection assembly, exhaust structure has exhaust cavity, exhaust cavity and the cavity of current collection assembly are communicated, exhaust structure has exhaust state and closed state, exhaust cavity is isolated from the outside of microchannel heat exchanger in closed state, exhaust cavity is communicated with the outside of microchannel heat exchanger in exhaust state, to discharge air in current collection assembly.

[0006] Further, the exhaust structure includes a connecting cylinder and a plug, the connecting cylinder is fixedly connected with the current collection assembly, a cavity of the connecting cylinder forms the exhaust cavity, and the exhaust cavity has an exhaust port; wherein, the plug blocks the exhaust port in the closed state, and the plug avoids the exhaust port in the exhaust state.

[0007] Further, the plug and the connecting cylinder are detachably threadedly connected to make the exhaust structure in the exhaust state or the closed state.

[0008] Further, the inner wall of the exhaust cavity has internal threads, the plug includes an end cap and a blocking column connected with each other, the radial dimension of the end cap is greater than that of the blocking column, the blocking column has external threads, and the blocking column is threadedly connected with the connecting cylinder; in the case that the blocking column is threadedly connected with the connecting cylinder, the end face of the end cap abuts against the end face of the connecting cylinder.

[0009] Further, the axial dimension of the exhaust cavity is X, and the axial dimension of the blocking column is L; wherein, X>L, and / or 7mm≤L≤10mm.

[0010] Further, the plug has a blind hole, and an inner circumferential surface of the blind hole is a polygonal surface; or an outer circumferential surface of the plug has a polygonal surface.

[0011] Further, the connecting cylinder comprises a first cylinder segment and a second cylinder segment connected to each other, an outer diameter of the first cylinder segment is greater than an outer diameter of the second cylinder segment, wherein the first cylinder segment is sleeved on the end portion of the current collecting assembly and connected to the current collecting assembly, and a cavity of the second cylinder segment forms the exhaust cavity.

[0012] Further, the connecting cylinder is a straight cylinder, the side wall of the current collecting assembly is provided with a connecting opening, one end of the straight cylinder penetrates into the connecting opening and is connected to an inner wall of the connecting opening, and the other end of the straight cylinder is connected to the plug.

[0013] Further, the exhaust structure further comprises an adapter, the connecting cylinder is fixedly connected to the current collecting assembly through the adapter; wherein the adapter has a planar connecting surface and an arc-shaped connecting surface arranged oppositely, the connecting cylinder is fixed to the planar connecting surface, and the arc-shaped connecting surface is welded to an arc-shaped outer surface of the current collecting assembly, and cavities of the current collecting assembly and the adapter and the exhaust cavity are sequentially communicated.

[0014] Further, the exhaust structure further comprises an annular sealing member, the annular sealing member is arranged around the exhaust port, and the annular sealing member is clamped between the connecting cylinder and the plug.

[0015] Further, the plug and the connecting cylinder are clamped; or, the plug and the connecting cylinder are not connected before the exhaust cavity exhausts, and the plug and the connecting cylinder are welded after the exhaust cavity exhausts.

[0016] Further, the current collecting assembly comprises a current collecting pipe, a liquid accumulator and a connecting structure, the liquid accumulator is communicated with the current collecting pipe through the connecting structure, and the plurality of heat exchange flat tubes are all communicated with the current collecting pipe; wherein the exhaust structure is mounted on the current collecting pipe, and / or the exhaust structure.

[0017] In the scheme, the plurality of heat exchange flat tubes are communicated with the current collecting assembly, so that the heat exchange medium can be more evenly distributed into each heat exchange flat tube, which helps to improve the heat exchange efficiency. The heat exchange flat tubes are connected through the fins, so that the micro-channel heat exchanger can still achieve a large heat exchange area in the case of limited space, and the heat exchange effect is improved. The exhaust structure can be communicated with the outside through the exhaust cavity, and the air in the current collecting assembly can be effectively exhausted in the exhaust state, so as to avoid the accumulation of air in the current collecting assembly, so that the filling amount of the heat exchange medium in the internal of the heat exchanger system is reduced, and the heat exchange efficiency caused by air retention is avoided. If there is a part of air in the internal of the micro-channel heat exchanger, the condensed water is easy to accumulate in the air area with lower temperature, and the air is exhausted through the exhaust structure, so as to effectively reduce the accumulation of condensed water in the current collecting assembly, prevent the influence of the condensed water generated in the internal of the micro-channel heat exchanger, maintain the stable operation of the heat exchanger, and avoid the corrosion caused by the accumulation of water. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings accompanying the specification of this application serve to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 A structure schematic view of the micro-channel heat exchanger provided by the embodiment one of the present application is shown;

[0020] Figure 2 A structure schematic view of the exhaust structure of the micro-channel heat exchanger provided by the embodiment one of the present application is shown;

[0021] Figure 3 A sectional view of the exhaust structure of the micro-channel heat exchanger provided by the embodiment one of the present application is shown;

[0022] Figure 4 A structure schematic view of the liquid accumulator of the micro-channel heat exchanger provided by the embodiment two of the present application is shown;

[0023] Figure 5 A structure schematic view of the exhaust structure of the micro-channel heat exchanger provided by the embodiment three of the present application is shown;

[0024] Figure 6 A structure schematic view of the exhaust structure of the micro-channel heat exchanger provided by the embodiment four of the present application is shown;

[0025] Figure 7 A structure schematic view of the exhaust structure of the micro-channel heat exchanger provided by the embodiment five of the present application is shown.

[0026] Among them, the above drawings include the following reference signs:

[0027] 10, current collection assembly; 11, current collection pipe; 12, liquid accumulator; 13, connecting structure; 20, exhaust structure; 21, exhaust cavity; 22, connecting cylinder; 221, first cylinder segment; 222, second cylinder segment; 23, plug; 231, end cover; 232, plugging column; 233, blind hole; 24, adapter seat; 241, planar connecting surface; 242, arc-shaped connecting surface; 25, annular sealing element; 30, heat exchange flat tube. DETAILED DESCRIPTION

[0028] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting on the present application and its applications or uses. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0029] As shown in Figures 1 to 3 Embodiment one of the present application provides a micro-channel heat exchanger, which comprises a flow collecting assembly 10, an exhaust structure 20 and a plurality of heat exchange flat tubes 30. The plurality of heat exchange flat tubes 30 are arranged at intervals along the length direction of the flow collecting assembly 10 and are in communication with the flow collecting assembly 10. The exhaust structure 20 is installed on the flow collecting assembly 10. The exhaust structure 20 has an exhaust cavity 21. The exhaust cavity 21 is in communication with the cavity of the flow collecting assembly 10. The exhaust structure 20 has an exhaust state and a closed state. In the closed state, the exhaust cavity 21 is isolated from the outside of the micro-channel heat exchanger. In the exhaust state, the exhaust cavity 21 is in communication with the outside of the micro-channel heat exchanger to exhaust the air in the flow collecting assembly 10.

[0030] In the present embodiment, the plurality of heat exchange flat tubes 30 are in communication with the flow collecting assembly 10, which can more evenly distribute the heat exchange medium to each heat exchange flat tube, helping to improve the heat exchange efficiency. The exhaust structure 20 can be in communication with the outside through the exhaust cavity 21. In the exhaust state, the air in the flow collecting assembly 10 can be effectively exhausted, avoiding the accumulation of air in the flow collecting assembly 10, reducing the filling amount of the heat exchange medium inside the heat exchanger system, and avoiding the decrease of heat exchange efficiency caused by air retention. If there is some air inside the micro-channel heat exchanger, the condensate water is easy to accumulate in the area with lower temperature. The air is exhausted through the exhaust structure 20, which can effectively reduce the accumulation of condensate water in the flow collecting assembly 10, prevent the influence of condensate water inside the micro-channel heat exchanger, maintain the stable operation of the heat exchanger, and avoid corrosion caused by the accumulation of water.

[0031] Among them, the heat exchange flat tubes 30 are connected through fins, so that the micro-channel heat exchanger can still achieve a larger heat exchange area under the condition of limited space, improving the heat exchange effect.

[0032] As shown in Figure 2 and Figure 3 The exhaust structure 20 comprises a connecting cylinder 22 and a plug 23. The connecting cylinder 22 is fixedly connected with the flow collecting assembly 10. The cavity of the connecting cylinder 22 forms the exhaust cavity 21. The exhaust cavity 21 has an exhaust port. In the closed state, the plug 23 blocks the exhaust port. In the exhaust state, the plug 23 avoids the exhaust port.

[0033] In the present embodiment, the air in the collecting assembly 10 is discharged by plugging or avoiding the exhaust port on the exhaust cavity 21 by the plug 23. In the closed state, the plug 23 plugs the exhaust port, so that the exhaust cavity 21 is isolated from the outside world, preventing the outside air or impurities from entering the inside of the micro-channel heat exchanger, ensuring that the collecting assembly 10 will not be affected by the external environment. In the exhaust state, the plug 23 avoids the exhaust port, allowing the air in the collecting assembly 10 to be discharged through the exhaust port, so that the accumulated air can be quickly discharged, avoiding the accumulation of condensed water, the decrease of the filling amount of the heat exchange medium, and the decrease of the heat exchange efficiency.

[0034] Further, the plug 23 and the connecting cylinder 22 are detachably screwed to make the exhaust structure 20 in the exhaust state or the closed state. In the present embodiment, the plug and the connecting cylinder are connected by screwing, which provides high structural strength and can also improve the sealing effect. In the closed state, the plug 23 is tightly combined with the connecting cylinder 22 through screwing, which can effectively prevent the outside air or other gases from entering, ensuring the isolation of the exhaust cavity 21 from the outside world and maintaining the efficient operation of the micro-channel heat exchanger. Moreover, the screw connection makes the connection between the plug 23 and the connecting cylinder 22 easily detachable, so that when maintenance, cleaning or repair is needed, the plug 23 can be easily detached by rotating, reducing the downtime and improving the heat exchange efficiency.

[0035] Specifically, the inner wall of the exhaust cavity 21 has an internal thread, the plug 23 includes an end cap 231 and a plugging column 232 connected with each other, the radial dimension of the end cap 231 is greater than that of the plugging column 232, the plugging column 232 has an external thread, and the plugging column 232 and the connecting cylinder 22 are screwed; in the state of screwing between the plugging column 232 and the connecting cylinder 22, the end face of the end cap 231 abuts against the end face of the connecting cylinder 22.

[0036] In the present embodiment, the external thread of the plugging column 232 cooperates with the internal thread of the inner wall of the exhaust cavity 21 to ensure the sealing between the plug 23 and the connecting cylinder 22, which can effectively prevent the outside air from entering and ensure the efficient operation of the micro-channel heat exchanger in the state of screwing between the plugging column 232 and the connecting cylinder 22. The radial dimension of the end cap 231 is greater than that of the plugging column 232, and the end face of the end cap 231 abuts against the end face of the connecting cylinder 22, which further enhances the sealing effect in the closed state and also ensures the stability of the plug 23, effectively preventing the entry of external air or pollutants during the operation of the micro-channel heat exchanger.

[0037] Specifically, the axial dimension of the exhaust cavity 21 is X, and the axial dimension of the plugging column 232 is L; wherein X>L, and / or 7mm≤L≤10mm.

[0038] In the embodiment, the axial dimension X of the exhaust cavity 21 is greater than the axial dimension L of the plugging column 232, so that the plugging column 232 can not extend into the cavity of the flow collecting assembly 10, and the space in the flow collecting assembly 10 is not occupied, and the filling amount of the heat exchange medium is not affected.

[0039] As shown in Figure 2 , 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 circumferential surface of the plug 23 has a polygonal surface.

[0040] In the embodiment, the outer circumferential surface or the inner circumferential surface of the blind hole 233 of the plug 23 adopts a polygonal surface structure, so that the contact surface between the plug 23 and the dismounting tool can be increased, the plug 23 can be accurately matched with the shape of the cooperating tool, and the sliding or slipping problem that may occur on the circular contact surface is avoided. Moreover, the polygonal surface not only can provide a larger contact area, but also can effectively disperse external force, so that the plug 23 can uniformly distribute the load when bearing pressure, vibration or external force, and local overloading is avoided to cause damage or deformation, the compression resistance and durability of the plug 23 are improved, and the service life of the plug 23 is prolonged.

[0041] As shown in Figure 2 , the connecting cylinder 22 includes a first cylinder segment 221 and a second cylinder segment 222 connected with each other, and the outer diameter of the first cylinder segment 221 is greater than the outer diameter of the second cylinder segment 222, wherein the first cylinder segment 221 is sleeved on the end portion of the flow collecting assembly 10 and connected with the flow collecting assembly 10, for example, welded, and the cavity of the second cylinder segment 222 forms the exhaust cavity 21.

[0042] In the embodiment, the outer diameter of the first cylinder segment 221 is greater than the outer diameter of the second cylinder segment 222, so that the connecting cylinder 22 can be effectively fixed on the end portion of the flow collecting assembly 10, and the two are tightly connected by welding, so that the connecting portion is prevented from loosening or leaking under high pressure or high temperature conditions, the overall sealing performance of the micro-channel heat exchanger is improved, and it is ensured that external gas cannot enter the flow collecting assembly. By designing the first cylinder segment 221 and the second cylinder segment 222 as two connecting segments, the overall design is simplified, the welding mode is used instead of bolt or threaded connection, the number of components is reduced, the risk of connection loosening is reduced, and the overall structure is more compact and simple. Moreover, the cavity of the second cylinder segment 222 forms the exhaust cavity 21, so that the exhaust cavity 21 has sufficient space, the air in the flow collecting assembly 10 can be effectively exhausted, air flow stagnation is prevented, and the heat exchange efficiency of the micro-channel heat exchanger is ensured.

[0043] As shown in Figure 3 , the exhaust structure 20 further includes an annular sealing member 25, the annular sealing member 25 is arranged around the exhaust port, and the annular sealing member 25 is clamped between the connecting cylinder 22 and the plug 23.

[0044] In the embodiment, the annular sealing member 25 can form a tight seal between the plug 23 and the connecting cylinder 22 to prevent external air from entering the exhaust cavity 21 from between the plug 23 and the connecting cylinder 22. Since the annular sealing member 25 is arranged around the exhaust port, the overall sealing performance is improved. Moreover, the annular sealing member 25 can relieve the vibration between the connecting cylinder 22 and the plug 23, avoid the influence of the vibration on the interface, and reduce the phenomenon of seal damage caused by the vibration.

[0045] As shown in Figure 1 and Figure 4 , the current collecting assembly 10 comprises a current collecting pipe 11, a liquid reservoir 12, and a connecting structure 13. The liquid reservoir 12 is in communication with the current collecting pipe 11 through the connecting structure 13, and a plurality of heat exchange flat tubes 30 are in communication with the current collecting pipe 11. The exhaust structure 20 is installed on the current collecting pipe 11 and / or the liquid reservoir 12. In the present scheme, the current collecting pipe 11 is connected with the plurality of heat exchange flat tubes 30, which ensures that the heat exchange medium can effectively flow through the heat exchange flat tubes 30, thereby improving the heat exchange efficiency.

[0046] As shown in Figure 1 , when the exhaust structure 20 is installed on the current collecting pipe 11, the air in the current collecting pipe 11 can be effectively exhausted, avoiding the air retention in the current collecting pipe 11 and the influence of air blockage on the heat exchange efficiency. The connecting structure 13 between the liquid reservoir 12 and the current collecting pipe 11 ensures that the heat exchange medium can be uniformly distributed and circulated in the entire micro-channel heat exchanger.

[0047] As shown in Figure 4 , in the second embodiment provided in the present scheme, 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, making the circulation efficiency of the heat exchange medium higher and further improving the performance and flexibility of the entire micro-channel heat exchanger.

[0048] As shown in Figure 5 , in the third embodiment provided in the present scheme, the connecting cylinder 22 is a straight cylinder, and a connecting port is formed in the side wall of the current collecting assembly 10. One end of the straight cylinder penetrates into the connecting port and is connected with the inner wall of the connecting port, for example, by welding. The other end of the straight cylinder is connected with the plug 23.

[0049] The connecting cylinder 22 is designed in a straight cylinder shape, and one end of the straight cylinder is welded to the inner wall of the connecting port of the current collecting assembly 10. The welding connection eliminates the gap between the straight cylinder and the connecting port, avoiding the possibility of air entering the current collecting assembly 10 from the gap. Moreover, the design of the connecting cylinder 22 in a straight cylinder shape can make the connecting cylinder 22 not be limited by the position and the number, and can be installed at any position of the current collecting assembly 10, without being limited to the end of the current collecting assembly 10. Multiple connecting cylinders 22 can also be arranged at intervals, improving the flexibility and heat exchange efficiency of the entire micro-channel heat exchanger.

[0050] As Figure 6 shown in the fourth embodiment provided by the present solution, the exhaust structure 20 further comprises an adapter 24, the connecting cylinder 22 is fixedly connected with the current collecting assembly 10 through the adapter 24; wherein the adapter 24 has oppositely arranged planar connecting surface 241 and arc-shaped connecting surface 242, the connecting cylinder 22 is fixed to the planar connecting surface 241, and the arc-shaped connecting surface 242 is welded with the arc-shaped outer surface of the current collecting assembly 10, and the cavity of the current collecting assembly 10, the cavity of the adapter 24 and the exhaust cavity 21 are sequentially communicated.

[0051] Through the adapter 24, the connection between the connecting cylinder 22 and the current collecting assembly 10 is more stable, the planar connecting surface 241 of the adapter 24 is fixed with the connecting cylinder 22, and the arc-shaped connecting surface 242 is welded with the arc-shaped outer surface of the current collecting assembly 10, which ensures the strength and durability between the connecting components, reduces the problem of loose connection caused by vibration or temperature change, improves the stability of the micro-channel heat exchanger, and also improves the sealing performance. The arc-shaped connecting surface 242 of the adapter 24 increases the contact area with the current collecting assembly 10, and through the smooth connection between the adapter 24 and the current collecting assembly 10 and the connecting cylinder 22, the complex connection and corner problems that may occur are avoided.

[0052] As Figure 7 shown in the fifth embodiment of the present solution, the plug 23 and the connecting cylinder 22 are not connected before the exhaust of the exhaust cavity 21, and the plug 23 and the connecting cylinder 22 are welded after the exhaust of the exhaust cavity 21.

[0053] The plug 23 and the connecting cylinder 22 are not connected before the exhaust of the exhaust cavity 21, and the plug 23 and the connecting cylinder 22 are welded after the exhaust of the exhaust cavity 21, so that the air or liquid in the current collecting assembly 10 can be discharged before installation, and the entire exhaust process can be carried out independently, and then the plug 23 and the connecting cylinder 22 are welded, which will not affect other operation steps. In this way, the sealing performance of the micro-channel heat exchanger can be higher and the structure can be more stable. Moreover, the welding is not performed before the exhaust, which can provide higher flexibility in some complex situations and can be more accurately positioned and adjusted.

[0054] Alternatively, in an embodiment not shown, the plug 23 and the connecting cylinder 22 are clamped. The plug 23 and the connecting cylinder 22 are connected by clamping, which can make the assembly process more simple, reduce unnecessary installation steps, and reduce the dependence on complex processes, thereby improving production efficiency, shortening assembly time and reducing the possibility of errors during assembly.

[0055] The micro-channel heat exchanger provided by the scheme can effectively discharge the air in the heat exchanger by setting the switchable exhaust structure 20 in the flow collecting assembly 10, avoiding the influence of air accumulation on the heat exchange efficiency. In the exhaust state, the air can be smoothly discharged from the exhaust cavity 21, and in the closed state, the exhaust cavity 21 is isolated from the external environment, ensuring the sealing of the heat exchanger. This design not only simplifies the structure of the heat exchanger, but also improves the stability and efficiency of its operation, and improves the performance of the refrigeration or heating system. In addition, by setting different sizes, connection modes and positions of the exhaust structure 20, the micro-channel heat exchanger of the scheme can better adapt to various working environments and use conditions, such as heat exchange requirements in high temperature, high pressure or corrosive environments.

[0056] The above only describes optional embodiments of the present scheme and is not intended to limit the present scheme. For those skilled in the art, the present scheme can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present scheme shall be included in the protection scope of the present scheme.

[0057] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of the features, steps, operations, devices, components and / or combinations thereof.

[0058] Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present scheme. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship. The technology, methods and devices known to those skilled in the relevant art can not be discussed in detail, but under appropriate circumstances, the technology, methods and devices should be considered as part of the specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0059] In the description of the present solution, it needs to be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship is generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present solution and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the scope of protection of the present solution; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0060] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0061] In addition, it needs to be pointed out that the use of "first", "second" and the like to define parts only for the convenience of distinguishing the corresponding parts, and if there is no further declaration, the above words have no special meaning, therefore cannot be understood as a limitation on the scope of protection of the present solution.

Claims

1. A microchannel heat exchanger characterized by, The micro-channel heat exchanger comprises a current collecting assembly (10), an exhaust structure (20) and a plurality of heat exchange flat tubes (30), the plurality of heat exchange flat tubes (30) are arranged at intervals along the length direction of the current collecting assembly (10) and are communicated with the current collecting assembly (10), the exhaust structure (20) is installed on the current collecting assembly (10), the exhaust structure (20) has an exhaust cavity (21), the exhaust cavity (21) is communicated with the cavity of the current collecting assembly (10), the exhaust structure (20) has an exhaust state and a closed state, in the closed state, the exhaust cavity (21) is isolated from the outside of the micro-channel heat exchanger, in the exhaust state, the exhaust cavity (21) is communicated with the outside of the micro-channel heat exchanger to exhaust the air in the current collecting assembly (10).

2. The micro-channel heat exchanger of claim 1, wherein, The exhaust structure (20) comprises a connecting cylinder (22) and a plug (23), the connecting cylinder (22) is fixedly connected with the current collecting assembly (10), the cavity of the connecting cylinder (22) forms the exhaust cavity (21), and the exhaust cavity (21) has an exhaust port; wherein, 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 micro-channel heat exchanger of claim 2, wherein, The plug (23) and the connecting cylinder (22) are detachably screwed to make the exhaust structure (20) in the exhaust state or the closed state.

4. The micro-channel heat exchanger of claim 3, wherein, The inner wall of the exhaust cavity (21) has an internal thread, the plug (23) comprises an end cover (231) and a blocking column (232) connected with each other, the radial dimension of the end cover (231) is greater than that of the blocking column (232), the blocking column (232) has an external thread, and the blocking column (232) is screwed with the connecting cylinder (22); in the case that the blocking column (232) is screwed with the connecting cylinder (22), the end face of the end cover (231) abuts against the end face of the connecting cylinder (22).

5. The micro-channel heat exchanger of claim 4, wherein, The axial dimension of the exhaust cavity (21) is X, and the axial dimension of the blocking column (232) is L; wherein, X>L, and / or 7mm≤L≤10mm.

6. The micro-channel heat exchanger according to claim 3, wherein, The plug (23) has a blind hole (233), and the inner peripheral 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) comprises a first cylinder segment (221) and a second cylinder segment (222) connected with each other, the outer diameter of the first cylinder segment (221) is greater than that of the second cylinder segment (222), wherein the first cylinder segment (221) is sleeved on the end portion of the current collecting assembly (10) and is connected with the current collecting assembly (10), and the cavity of the second cylinder segment (222) forms the exhaust cavity (21).

8. The micro-channel heat exchanger of claim 2, wherein, The connecting cylinder (22) is a straight cylinder, a connecting port is formed on the side wall of the current collecting assembly (10), one end of the straight cylinder penetrates into the connecting port and is connected with the inner wall of the connecting port, and the other end of the straight cylinder is connected with the plug (23).

9. The micro-channel heat exchanger of claim 2, wherein, The exhaust structure (20) further comprises an adapter (24), the connecting cylinder (22) is fixedly connected with the current collecting assembly (10) through the adapter (24); wherein the adapter (24) has oppositely arranged planar connecting surfaces (241) and arc connecting surfaces (242), the connecting cylinder (22) is fixed on the planar connecting surfaces (241), the arc connecting surfaces (242) are welded with the arc outer surfaces of the current collecting assembly (10), the cavity of the current collecting assembly (10), the cavity of the adapter (24) and the exhaust cavity (21) are sequentially communicated.

10. The micro-channel heat exchanger of any one of claims 2 to 9, wherein, The exhaust structure (20) further comprises an annular sealing member (25), the annular sealing member (25) is arranged around the exhaust port, and the annular sealing member (25) is clamped between the connecting cylinder (22) and the plug (23).

11. The micro-channel heat exchanger of claim 2, wherein, The plug (23) and the connecting cylinder (22) are clamped; Or, the plug (23) and the connecting cylinder (22) are not connected before the exhaust cavity (21) exhausts, and the plug (23) and the connecting cylinder (22) are welded after the exhaust cavity (21) exhausts.

12. The micro-channel heat exchanger of claim 1, wherein, The current collecting assembly (10) comprises a current collecting pipe (11), a liquid reservoir (12) and a connecting structure (13), the liquid reservoir (12) is communicated with the current collecting pipe (11) through the connecting structure (13), and a plurality of the heat exchange flat tubes (30) are communicated with the current collecting pipe (11); wherein the exhaust structure (20) is installed on the current collecting pipe (11), and / or the exhaust structure (20) is installed on the liquid reservoir (12).

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