Non-return structure machining tool, micro-channel heat exchanger and manufacturing method of micro-channel heat exchanger
By setting a check-reverse structure at the inlet end of the microchannel tube and setting a step-down cavity at the outlet end, the problem of refrigerant countercurrent and excessive pressure drop in the microchannel heat exchanger is solved, and the heat exchange efficiency is improved.
Patent Information
- Application Number
- CN202411886880.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-03-11
AI Technical Summary
The existing microchannel heat exchangers often experience refrigerant countercurrent in the inlet collector, which affects working efficiency, and there is a problem of excessive gas pressure drop in the outlet collector, which increases system energy consumption and reduces heat exchange coefficient.
The microchannel tube has a check-reverse structure, and the flaring and bundle port are formed by the design of the bent plate to reduce the formation of countercurrent; a pressure reduction cavity is provided at the outlet end to alleviate the problem of excessive pressure drop.
Effectively reduce the occurrence of refrigerant countercurrent, reduce pressure drop, and thus improve heat exchange efficiency.
Smart Images
Figure CN119594767A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of heat exchangers, and in particular to a non-return structure processing tool, a microchannel heat exchanger and a manufacturing method thereof. Background Art
[0002] As a new type of heat exchange equipment, microchannel heat exchanger has significant advantages such as small refrigerant charge, lightweight structure, small size and high heat exchange efficiency, and has broad application prospects in industrial production and civil fields. However, there are still several technical problems that need to be solved in the actual application of existing microchannel heat exchangers: first, refrigerant backflow often occurs in the inlet manifold of the heat exchanger, which seriously affects the working efficiency of the heat exchanger; second, there is a problem of excessive gas pressure drop in the outlet manifold, which not only increases the energy consumption of the system, but also leads to a low heat transfer coefficient. Summary of the invention
[0003] The present application aims to solve at least one of the above-mentioned technical problems in the prior art to a certain extent. To this end, the present application provides a non-return structure processing tool, a microchannel heat exchanger and a manufacturing method thereof, which reduces the refrigerant backflow by setting a non-return structure at the inlet end of the microchannel tube, and reduces the problem of excessive pressure drop by setting a pressure reduction cavity at the outlet end of the microchannel tube, thereby effectively improving the heat exchange efficiency.
[0004] A microchannel heat exchanger, comprising an inlet manifold, an outlet manifold and a microchannel tube, wherein one end of the microchannel tube is an inlet end and the other end is an outlet end, a plurality of baffles are arranged inside the microchannel tube, each of the baffles is arranged at intervals in the connection, the baffles extend along the length direction of the microchannel tube, a fluid channel is formed between two adjacent baffles, a plurality of non-return structures are arranged at the inlet end of the microchannel tube, the non-return structure comprises two opposite bent plates, the two bent plates are arranged at intervals along the width direction of the microchannel tube, one end of the two bent plates is directed to The microchannel tube is provided with a plurality of non-return structures, each of which ...
[0005] In an optional or preferred embodiment, the bending plate includes a first bending section, a second bending section and a third bending section, the first bending section and the third bending section are obliquely connected at both ends of the second bending section, and the first bending section and the third bending section have the same inclination direction.
[0006] In an optional or preferred embodiment, the flared ends of the two bent plates close to the inlet end are connected to the inner wall of the inlet end.
[0007] In an optional or preferred embodiment, two anti-return structures are provided.
[0008] A tool for processing a non-return structure, characterized in that it is used to process the non-return structure of claim 1, and the tool comprises an inclined plate, a connecting plate and a triangular plate, one end of the connecting plate is connected to one of the triangular sides of the triangular plate, the inclined plate is obliquely connected to the other end of the connecting plate, the triangular plate protrudes to one side of the connecting plate, and the inclined plate is inclined from the other side of the connecting plate.
[0009] In an optional or preferred embodiment, the triangular plate is a right-angled plate.
[0010] A method for manufacturing a microchannel heat exchanger, used to manufacture the microchannel heat exchanger described above, comprises the following steps:
[0011] Cutting off the partition at the inlet end of the microchannel tube and separating it from the inner wall of the microchannel tube;
[0012] The cut partition is processed into a bent plate structure by the non-return structure processing tool, and then the partition processed into the bent plate structure is welded and fixed to the inner wall of the microchannel tube to form a non-return structure at the inlet end of the microchannel tube;
[0013] The partition extending to the outlet end of the microchannel tube is cut off to form a pressure-reducing cavity at the outlet end of the microchannel tube.
[0014] Based on the above technical scheme, the embodiment of the present application has at least the following beneficial effects: during operation, the refrigerant enters the microchannel tube through the inlet manifold, and then flows out from the outlet manifold, thereby realizing heat exchange. Since a check structure is provided at the inlet end of the microchannel tube, the structure of the check structure is similar to that of a Tesla valve. When the flow is downstream, the bundle end of the check structure has a constriction for increasing the flow rate and enhancing heat transfer. When the flow is upstream, a backflow will be formed between the two check structures, and the dynamic pressure will be reduced by colliding with the upstream flow, thereby reducing the formation of the backflow. When the refrigerant flows through each fluid channel and suddenly flows to the pressure reduction cavity, the space suddenly becomes larger when the refrigerant enters the pressure reduction cavity from the fluid channel, and the refrigerant speed will decrease, thereby being able to reduce the pressure drop. Therefore, the present application reduces the occurrence of refrigerant backflow by providing a check structure at the inlet end of the microchannel tube, and reduces the problem of excessive pressure drop by providing a pressure reduction cavity at the outlet end of the microchannel tube, thereby effectively improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The present application is further described below with reference to the accompanying drawings and embodiments;
[0016] Figure 1 is a schematic structural diagram of a microchannel heat exchanger provided in an embodiment of the present application;
[0017] Figure 2 is a schematic structural diagram of the inlet end of the microchannel tube of the present application;
[0018] Figure 3 It is a schematic diagram of the downstream state of the inlet end of the microchannel tube of the present application;
[0019] Figure 4 is a schematic diagram of the countercurrent state at the inlet end of the microchannel tube of the present application;
[0020] Figure 5 is a schematic structural diagram of the outlet end of the microchannel tube of the present application;
[0021] Figure 6 It is a structural schematic diagram of the anti-return structure processing tool of the present application;
[0022] Figure 7 It is a schematic diagram of the non-return structure processing tool of the present application being inserted into both sides of the partition in the microchannel tube;
[0023] Figure 8 It is a schematic diagram of the bent plate after being processed by the anti-return structure processing tool of the present application. DETAILED DESCRIPTION
[0024] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.
[0025] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.
[0026] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0027] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.
[0028] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0029] As a new type of heat exchange equipment, microchannel heat exchanger has significant advantages such as small refrigerant charge, lightweight structure, small size and high heat exchange efficiency, and has broad application prospects in industrial production and civil fields. However, there are still several technical problems that need to be solved in the actual application of existing microchannel heat exchangers: first, refrigerant backflow often occurs in the inlet manifold of the heat exchanger, which seriously affects the working efficiency of the heat exchanger; second, there is a problem of excessive gas pressure drop in the outlet manifold, which not only increases the energy consumption of the system, but also leads to a low heat transfer coefficient.
[0030] Reference Figures 1 to 5 The present application provides a microchannel heat exchanger, including an inlet manifold 100, an outlet manifold 200 and a microchannel tube 300, one end of the microchannel tube 300 is an inlet end, and the other end is an outlet end, a plurality of partitions 310 are arranged inside the microchannel tube 300, each partition 310 is arranged at intervals inside the microchannel tube 300, the partition 310 extends along the length direction of the microchannel tube 300, and a fluid channel 311 is formed between two adjacent partitions 310, a plurality of non-return structures 320 are arranged at the inlet end of the microchannel tube 300, the non-return structure 320 includes two opposite bending plates 321, the two bending plates 321 are arranged at intervals along the width direction of the microchannel tube 300, and the two bending plates One end of 321 is bent outward to form a flared end 322, and the other ends of the two bent plates 321 are bent inward to form a constricted end 323. The flared end 322 of the non-return structure 320 faces the inlet end, and the constricted end 323 of the non-return structure 320 faces the outlet end. Along the length direction of the microchannel tube 300, each non-return structure 320 is arranged at intervals, and the flared end 322 of the non-return structure 320 corresponds to the constricted end 323 of the non-return structure 320 adjacent to it. Along the water inlet direction of the inlet end, the distance between the two bent plates 321 of each non-return structure 320 becomes smaller successively, and a pressure reduction cavity 330 is set at the outlet end of the microchannel tube 300, and the pressure reduction cavity 330 has the same inner diameter as the microchannel tube 300.
[0031] During operation, the refrigerant enters the microchannel tube 300 through the inlet header 100 and then flows out from the outlet header 200, thereby achieving heat exchange. Since a non-return structure 320 is provided at the inlet end of the microchannel tube 300, the structure of the non-return structure 320 is similar to that of a Tesla valve, such as Figure 3 As shown, in the downstream flow, the constriction end 323 of the anti-return structure 320 has a constriction function, thereby increasing the flow rate and enhancing the heat transfer, as shown in FIG. Figure 4As shown, in the case of reverse flow, a reverse flow will be formed between the two check structures 320, and the reverse flow will collide with the lower dynamic pressure, thereby reducing the formation of reverse flow. When the refrigerant suddenly flows to the pressure reduction cavity 330 through each fluid channel 311, the refrigerant speed will decrease due to the sudden increase in space when the refrigerant enters the pressure reduction cavity 330 from the fluid channel 311, thereby reducing the pressure drop. Therefore, the present application reduces the occurrence of refrigerant reverse flow by setting a check structure 320 at the inlet end of the microchannel tube 300, and reduces the problem of excessive pressure drop by setting a pressure reduction cavity 330 at the outlet end of the microchannel tube 300, thereby effectively improving the heat exchange efficiency.
[0032] In some embodiments, the bending plate 321 includes a first bending section, a second bending section and a third bending section. The first bending section and the third bending section are obliquely connected to both ends of the second bending section, and the first bending section and the third bending section have the same inclination direction.
[0033] In some embodiments, the expanded ends 322 of the two bent plates 321 near the inlet end are connected to the inner wall of the inlet end, so as to further reduce the backflow of the refrigerant out of the inlet end of the microchannel tube 300 and reduce the backflow.
[0034] In the present application, two anti-return structures 320 are provided.
[0035] Of course, more anti-return structures 320 can be provided according to actual use requirements.
[0036] Reference Figure 6 The present application also provides a non-return structure processing tool 400 for processing the above-mentioned non-return structure 320. The non-return structure processing tool 400 includes an inclined plate 410, a connecting plate 420 and a triangular plate 430. One end of the connecting plate 420 is connected to one of the triangular sides of the triangular plate 430. The inclined plate 410 is obliquely connected to the other end of the connecting plate 420. The triangular plate 430 protrudes to one side of the connecting plate 420, and the inclined plate 410 is inclined from the other side of the connecting plate 420.
[0037] Reference Figure 7 , Figure 8 During use, the anti-return structure processing tools 400 are respectively inserted into both sides of the partition 310, one of which is inserted in the forward direction and the other is inserted in the reverse direction, and then the two anti-return structure processing tools 400 are squeezed close to each other so that the two anti-return structure processing tools 400 form a bent plate 321.
[0038] In some embodiments, the triangle plate 430 is a right-angled plate.
[0039] The present application also provides a method for manufacturing a microchannel heat exchanger, which is used to manufacture the above-mentioned microchannel heat exchanger, comprising the following steps:
[0040] Cutting off the partition plate 310 at the inlet end of the microchannel tube 300 and separating it from the inner wall of the microchannel tube 300;
[0041] The cut partition 310 is processed into a bent plate 321 by the aforementioned non-return structure processing tool 400, and then the partition 310 processed into the bent plate 321 is welded and fixed to the inner wall of the microchannel tube 300;
[0042] The partition plate 310 extending to the outlet end of the microchannel tube 300 is cut off to form a depressurization cavity 330 at the outlet end of the microchannel tube 300 .
[0043] The microchannel heat exchanger made by this method can reduce the backflow phenomenon at the inlet end and slow down the rapid change of pressure drop at the outlet end.
[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0045] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.
Claims
1. A microchannel heat exchanger, characterized in that: The invention comprises an inlet manifold, an outlet manifold and a microchannel tube, wherein one end of the microchannel tube is an inlet end and the other end is an outlet end, a plurality of partitions are arranged inside the microchannel tube, each of the partitions is arranged at intervals inside the microchannel tube, the partitions extend along the length direction of the microchannel tube, and a fluid channel is formed between two adjacent partitions, a plurality of non-return structures are arranged at the inlet end of the microchannel tube, and the non-return structure comprises two opposite bending plates, the two bending plates are arranged at intervals along the width direction of the microchannel tube, and one end of the two bending plates is bent outward A flared end is formed, and the other ends of the two bent plates are bent inwardly to form a constricted end. The flared end of the non-return structure faces the inlet end, and the constricted end of the non-return structure faces the outlet end. Along the length direction of the microchannel tube, each of the non-return structures is arranged at intervals, and the flared end of the non-return structure corresponds to the constricted end of the non-return structure adjacent to it. Along the water inlet direction of the inlet end, the spacing between the two bent plates of each non-return structure becomes smaller successively, and a pressure reduction cavity is set at the outlet end of the microchannel tube, and the pressure reduction cavity is the same as the inner diameter of the microchannel tube.
2. The microchannel heat exchanger according to claim 1, characterized in that: The bending plate includes a first bending section, a second bending section and a third bending section. The first bending section and the third bending section are obliquely connected to two ends of the second bending section. The first bending section and the third bending section have the same inclination direction.
3. The microchannel heat exchanger according to claim 1, characterized in that: The expanded ends of the two bent plates close to the inlet end are connected to the inner wall of the inlet end.
4. The microchannel heat exchanger according to claim 1, characterized in that: Two anti-return structures are provided.
5. A tool for machining a non-return structure, characterized in that: Used to process the anti-return structure of claim 1, the anti-return structure processing tool includes an inclined plate, a connecting plate and a triangular plate, one end of the connecting plate is connected to one of the triangular sides of the triangular plate, the inclined plate is obliquely connected to the other end of the connecting plate, the triangular plate protrudes to one side of the connecting plate, and the inclined plate is inclined from the other side of the connecting plate.
6. The microchannel heat exchanger according to claim 5, characterized in that: The triangular plate is a right-angle plate.
7. A method for manufacturing a microchannel heat exchanger, characterized in that: The method for manufacturing the microchannel heat exchanger according to claim 1 comprises the following steps: Cutting off the partition at the inlet end of the microchannel tube and separating it from the inner wall of the microchannel tube; The cut partition is processed into a bent plate structure by the non-return structure processing tool of claim 5, and then the partition processed into the bent plate structure is welded and fixed to the inner wall of the microchannel tube to form a non-return structure at the inlet end of the microchannel tube; the partition extending to the outlet end of the microchannel tube is cut off to form a pressure reduction cavity at the outlet end of the microchannel tube.