A composite dual-sided microchannel parallel flow heat exchanger

Abstract

This invention relates to a composite dual-sided microchannel parallel flow heat exchanger, comprising a collector assembly, several flat tubes, and a detachable flow guide assembly. The collector assembly includes an upper collector assembly and a lower collector assembly, with the upper collector assembly positioned above the lower collector assembly and connected to it via several flat tubes, forming a first microchannel parallel flow heat exchanger and a second microchannel parallel flow heat exchanger. The detachable flow guide assembly is disposed between the first and second microchannel parallel flow heat exchangers, with the flat tubes of the first and second microchannel parallel flow heat exchangers symmetrically arranged about the detachable flow guide assembly. This composite dual-sided microchannel parallel flow heat exchanger effectively improves drainage performance, ensuring both drainage and defrosting capabilities. Furthermore, due to its simple air channel structure, it reduces pressure drop on the air side and simplifies manufacturing.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of heat exchange equipment and heat transfer enhancement, and particularly relates to a composite double-sided micro-channel parallel flow heat exchanger. BACKGROUND

[0002] In the refrigeration, air conditioning, heat pump, waste heat utilization and ice storage industries, evaporators and condensers are key heat exchange components in the unit system. The main heat exchange components (including fins, flat tubes, collectors, fixed edge plates, etc.) of the existing parallel flow heat exchanger are made of aluminum, so there is welding between the flat tubes and the fins. This welding method has high cost and complex process, and the welding is prone to be not firm, resulting in falling phenomenon. The fin spacing error is large, and due to the vertically arranged flat tubes and horizontally installed fins, the drainage performance under wet conditions is serious, the frosting and defrosting periodic time is shortened under low temperature and wet conditions, and the unit performance is greatly reduced. SUMMARY

[0003] In order to solve the above problems existing in the prior art, the present application provides a composite double-sided micro-channel parallel flow heat exchanger. The technical problems to be solved by the present application are solved by the following technical scheme:

[0004] The present application provides a composite double-sided micro-channel parallel flow heat exchanger, comprising a collector assembly, a plurality of flat tubes and a detachable flow guide net assembly, wherein,

[0005] The collector assembly comprises an upper collector assembly and a lower collector assembly, the upper collector assembly is located above the lower collector assembly, and the upper collector assembly and the lower collector assembly are communicated through the plurality of flat tubes;

[0006] The upper collector assembly comprises a first upper collector and a second upper collector arranged side by side, and the lower collector assembly comprises a first lower collector and a second lower collector arranged side by side;

[0007] The first upper collector and the first lower collector are communicated through a plurality of flat tubes arranged in parallel and at intervals, and the longitudinal axis of the flat tube is perpendicular to the horizontal plane, forming a first micro-channel parallel flow heat exchanger, and the first upper collector is provided with a first inlet and a first outlet at both ends;

[0008] The second upper collector and the second lower collector are communicated through a plurality of flat tubes arranged in parallel and at intervals, and the longitudinal axis of the flat tube is perpendicular to the horizontal plane, forming a second micro-channel parallel flow heat exchanger, and the second upper collector is provided with a second inlet and a second outlet at both ends;

[0009] The detachable flow guide net assembly is arranged between the first micro-channel parallel flow heat exchanger and the second micro-channel parallel flow heat exchanger, and the flat tubes of the first micro-channel parallel flow heat exchanger and the flat tubes of the second micro-channel parallel flow heat exchanger are symmetrically arranged about the detachable flow guide net assembly.

[0010] In one embodiment of the present application, two baffles are arranged in the first upper header and the second upper header, and the two baffles are respectively located at 1 / 4 and 3 / 4 of the length of the upper header; one baffle is arranged in the first lower header and the second lower header, and the baffle is located at 1 / 2 of the length of the lower header.

[0011] In one embodiment of the present application, the first upper header and the second upper header are rectangular tubes; the first lower header and the second lower header are trapezoidal tubes, and the side surface of the trapezoidal tube connected with the flat tube is inclined, and the included angle between the inclined surface and the air flow direction is 3°-7°, and the inclined surface is inclined downward along the air flow direction.

[0012] In one embodiment of the present application, the included angle between the projection of the flat tube on the horizontal plane and the long side of the header connected with the flat tube is 52°-55°.

[0013] In one embodiment of the present application, a plurality of parallel flow channels are arranged in the flat tube, and the spacing between adjacent flat tubes is 5-6 mm.

[0014] In one embodiment of the present application, two rows of outer wine-cave convex structures are arranged on the outer side of one side wall of the flat tube, and the two rows of outer wine-cave convex structures are respectively located at 2 / 5 and 4 / 5 of the length of the flat tube.

[0015] In one embodiment of the present application, the height of the outer wine-cave convex structure is 2-3 mm, and the longitudinal spacing between adjacent outer wine-cave convex structures is 3-4 mm.

[0016] In one embodiment of the present application, the detachable flow guide net assembly comprises a detachable boss and a plurality of flow guide fins, wherein,

[0017] The plurality of flow guide fins are arranged in parallel and at intervals on the detachable boss;

[0018] The plurality of flow guide fins are located between the flat tubes of the first micro-channel parallel flow heat exchanger and the second micro-channel parallel flow heat exchanger.

[0019] In one embodiment of the present application, the detachable flow guide net assembly further comprises a plurality of rectangular fin-shaped structures, wherein,

[0020] The rectangular fin-shaped structures are inclined downward and arranged on the flow guide fins;

[0021] Each of the guide vanes is symmetrically provided with a plurality of rectangular sheet structures on both sides.

[0022] In one embodiment of the present application, the rectangular sheet structure is at an angle of 45° with the guide vane.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] 1. The composite double-sided micro-channel parallel flow heat exchanger of the present application is composed of two groups of mirror image parallel flow heat exchangers, and utilizes the inclined arrangement of the flat tubes to extend the air flow area, increase the heat exchange area, provide a turbulence effect, intensify the mixing of cold and hot air, and improve the heat exchange efficiency.

[0025] 2. The composite double-sided micro-channel parallel flow heat exchanger of the present application is provided with heat exchange micro-channels uniformly distributed on a single flat tube, the micro-channel flow passage size is further reduced compared with the current mainstream micro-channel flow passage size, and the number of passages on the flat tube is larger, which reduces the use of refrigerant and improves the reliability of operation due to the parallel arrangement of the flow passages. The micro-channel heat transfer coefficient increases significantly with the decrease of diameter, and compared with the larger diameter passage, the boundary layer of the micro-channel is thinner, the convective heat transfer process is stronger, the heat exchange effect is more obvious, and the air heat exchange effect is better. The use of micro-channel heat exchange can effectively reduce the heat exchange area, reduce the overall size of the heat exchanger, ensure the normal operation of the heat exchanger, and improve the heat exchange efficiency.

[0026] 3. The composite double-sided micro-channel parallel flow heat exchanger of the present application is provided with parallel flat tubes at a certain angle with the horizontal air flow direction, and the parallel flow flat tubes are mirror image symmetrically arranged in a herringbone shape, and an outer dimple protruding structure is arranged at a certain distance outside the parallel flow flat tube to induce vortex, break the boundary layer in the air flow direction, intensify the exchange of cold and hot air, and expand the heat exchange area. The smaller the flat tube spacing, the greater the wind speed, the greater the vortex intensity, the better the turbulence effect, the greater the heat exchange coefficient, the more obvious the heat exchange effect, the better the air heat exchange effect, and the flat tube width is further reduced.

[0027] 4. The composite double-sided micro-channel parallel flow heat exchanger of the present application is provided with smooth and finless outer surface of the parallel flow flat tube, and the collector is welded to the flat tube side wall surface facing downwardly inclined to the air flow direction, which effectively improves the drainage performance under the combined action of wind force and gravity, ensures the drainage and defrosting performance, and reduces the air side pressure drop and processing and manufacturing difficulty due to the simple air passage structure.

[0028] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, and to be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1a is a front view of a composite double-sided micro-channel parallel flow heat exchanger provided by an embodiment of the present application;

[0030] Figure 1b is a right view of a composite double-sided micro-channel parallel flow heat exchanger provided by an embodiment of the present application;

[0031] Figure 2 is a top view sectional view of a composite double-sided micro-channel parallel flow heat exchanger provided by an embodiment of the present application;

[0032] Figure 3a is a partial front view of a detachable flow guide net structure provided by an embodiment of the present application;

[0033] Figure 3b is a partial right view of a detachable flow guide net structure provided by an embodiment of the present application;

[0034] Figure 4a is an air flow path schematic view of a composite double-sided micro-channel parallel flow heat exchanger provided by an embodiment of the present application;

[0035] Figure 4b is an air flow path schematic view between two flat tubes provided by an embodiment of the present application;

[0036] Figure 5a is an internal structure schematic view of an upper header provided by an embodiment of the present application;

[0037] Figure 5b is an internal structure schematic view of a lower header provided by an embodiment of the present application;

[0038] Figure 6 is a refrigerant flow path schematic view of a composite double-sided micro-channel parallel flow heat exchanger provided by an embodiment of the present application;

[0039] Figure 7a is a top view of an upper header provided by an embodiment of the present application;

[0040] Figure 7b is a right view of an upper header provided by an embodiment of the present application;

[0041] Figure 7c is a right view of a lower header provided by an embodiment of the present application;

[0042] Figure 7d is a front view of a lower header provided by an embodiment of the present application;

[0043] Figure 8a is a schematic diagram of an outer wine-pit protruding structure of a flat tube provided by an embodiment of the present application;

[0044] Figure 8b is a schematic diagram of an outer wine-pit protruding structure provided by an embodiment of the present application;

[0045] Figure 9a is a partial front view of another detachable flow guide net structure provided by an embodiment of the present application;

[0046] Figure 9b is a partial right view of another detachable flow guide net structure provided by an embodiment of the present application.

[0047] Figure: 1 - header assembly; 101 - first upper header; 102 - second upper header; 103 - second upper header; 104 - second lower header; 11 - first inlet; 12 - first outlet; 13 - second inlet; 14 - second outlet; 2 - flat tube; 201 - outer wine-pit protruding structure; 3 - detachable flow guide net assembly; 301 - detachable boss; 302 - flow guide sheet; 303 - rectangular sheet structure; 401 - front flat tube group heat exchange domain; 402 - retention domain; 403 - rear flat tube group heat exchange domain. DETAILED DESCRIPTION

[0048] In order to further illustrate the technical means and effects taken by the present application to achieve the predetermined purposes, a composite double-sided micro-channel parallel flow heat exchanger according to the present application is described in detail below in combination with the drawings and specific embodiments.

[0049] The foregoing and other technical contents, features and effects of the present application can be clearly presented in the detailed description of the specific embodiments below in combination with the drawings. Through the description of the specific embodiments, the technical means and effects taken by the present application to achieve the predetermined purposes can be understood more deeply and specifically. However, the attached drawings are provided for reference and illustration only, and are not intended to limit the technical solutions of the present application.

[0050] Embodiment One

[0051] Please refer to Figure 1a , Figure 1b and Figure 2 , as shown in the figure, the composite double-sided micro-channel parallel flow heat exchanger of the present embodiment comprises a header assembly 1, a plurality of flat tubes 2 and a detachable flow guide net assembly 3.

[0052] The current application discloses a composite double-sided micro-channel parallel flow heat exchanger.

[0053] Optionally, the flat tubes 2 are inserted into the upper and lower header assemblies at a certain angle with the horizontal plane.

[0054] In the embodiment, the upper header assembly comprises a first upper header 101 and a second upper header 102 arranged side by side, and the lower header assembly comprises a first lower header 103 and a second lower header 104 arranged side by side.

[0055] The first upper header 101 and the first lower header 103 are connected by a plurality of flat tubes 2 arranged in parallel and at intervals and inclined, and the longitudinal axis of the flat tubes 2 is perpendicular to the horizontal plane, forming a first micro-channel parallel flow heat exchanger, and the two ends of the first upper header 101 are provided with a first inlet 11 and a first outlet 12. The second upper header 102 and the second lower header 104 are connected by a plurality of flat tubes 2 arranged in parallel and at intervals and inclined, and the longitudinal axis of the flat tubes 2 is perpendicular to the horizontal plane, forming a second micro-channel parallel flow heat exchanger, and the two ends of the second upper header 102 are provided with a second inlet 13 and a second outlet 14.

[0056] The detachable flow guide net assembly 3 is arranged between the first micro-channel parallel flow heat exchanger and the second micro-channel parallel flow heat exchanger, and the flat tubes 2 of the first micro-channel parallel flow heat exchanger and the flat tubes 2 of the second micro-channel parallel flow heat exchanger are symmetrically arranged about the detachable flow guide net assembly 3.

[0057] In the embodiment, the flat tubes 2 are inserted into the upper and lower header assemblies at a certain angle with the horizontal plane, and are symmetrically arranged about the detachable flow guide net assembly 3, forming a composite double-sided "herringbone" micro-channel parallel flow heat exchanger.

[0058] Optionally, the overall length of the composite double-sided micro-channel parallel flow heat exchanger is 202 mm, the height is 224 mm, and the width is 28 mm, and the size of the parallel flat tube heat exchange area is 190 mm in length, 180 mm in height, and 24.2 mm in width.

[0059] In the embodiment, the refrigerant enters from the inlet of the upper header, flows through the flat tubes 2, and is discharged from the outlet of the upper header, and the air flows in a direction perpendicular to the composite double-sided micro-channel parallel flow heat exchanger, sequentially passing through the first micro-channel parallel flow heat exchanger, the detachable flow guide net assembly 3, and the second micro-channel parallel flow heat exchanger.

[0060] The composite double-sided microchannel parallel flow heat exchanger of the embodiment is composed of two groups of parallel flow heat exchanger mirror image parallel connection, using the inclined arrangement of the flat tube, on the one hand, the air flow area is prolonged, the heat exchange area is increased, on the other hand, the flow disturbance is provided, the cold and hot air mixing is intensified, and the heat exchange efficiency is improved.

[0061] As shown in Figure 5a and Figure 5b , two baffles are arranged in the first upper header 101 and the second upper header 102, and the two baffles are located at 1 / 4 and 3 / 4 of the length of the upper header respectively; one baffle is arranged in the first lower header 103 and the second lower header 104, and the baffle is located at 1 / 2 of the length of the lower header. By arranging the baffle, the flat tube 2 is divided into four areas in the header, forming a plurality of U-shaped refrigerant flow paths in the upper and lower "U" type flow, so that the refrigerant flows multiple times and is fully heat exchanged. The flow direction of the refrigerant is shown in Figure 6 .

[0062] In an alternative embodiment, as shown in Figure 7a , Figure 7b , Figure 7c and Figure 7d , the first upper header 101 and the second upper header 102 are rectangular tubes; the first lower header 103 and the second lower header 104 are trapezoidal tubes, the side surface of the trapezoidal tube connected with the flat tube 2 is inclined, the included angle between the inclined surface and the air flow direction is 3°-7°, and the inclined surface is inclined downward along the air flow direction.

[0063] In the embodiment, by designing the first lower header 103 and the second lower header 104 as trapezoidal tubes, it is beneficial to promote the condensate water to flow to the lower side of the air outlet under the joint action of wind force and gravity, and improve the drainage performance.

[0064] In an alternative embodiment, a plurality of flat tubes 2 are uniformly and intermittently inserted into the header assembly 1, considering the processing difficulty and universality, the insertion depth accounts for 2 / 5 of the height of the cavity in the header,

[0065] Optionally, the flat tube 2 is a straight flat tube, the length of the flat tube is 16mm, the thickness of the flat tube is 0.7mm, the included angle between the projection of the flat tube 2 on the horizontal plane and the long side of the header connected with the flat tube is 52°-55°, and the spacing between adjacent flat tubes 2 is 5-6mm.

[0066] In order to enhance the heat exchange, the air-side heat exchange coefficient is improved by increasing the air-side heat exchange area and blocking the development of the air-side boundary layer, so the flat tube 2 is inserted into the header at a certain angle (52°-55°) with the horizontal section of the header, the heat exchange section is prolonged, the air flow area is effectively increased by nearly one time, and the air direction is formed at an angle with the air flow direction, which is beneficial to the occurrence of the vortex structure, the development of the air-side boundary layer is blocked, the heat exchange efficiency is improved.

[0067] Optionally, a plurality of parallel flow channels are arranged in the flat tube 2 as micro-channel flow channels, the total length of the flow channels is 200 mm, the flow channels at both ends of the flat tube are in a “D” type, the flow channels in the middle are in a “mouth” type, the hole height of the flow channels is 0.28-0.32 mm, the hole width is 0.25-0.28 mm, and the hole spacing is 0.8-1.5 times the hole length.

[0068] In the embodiment, the micro-channel flow channel hole size is further reduced compared with the current mainstream micro-channel flow channel size, and the number of channels on the flat tube is larger, which reduces the use of refrigerant on the one hand, and improves the situation of blocked channels due to the parallel arrangement of the flow channels on the other hand, thereby improving the reliability of operation. The micro-channel heat transfer coefficient increases significantly with the decrease of the diameter. Compared with the larger diameter channel, the boundary layer of the micro-channel is thinner, the convective heat transfer process is stronger, the heat exchange effect is more obvious, and the air heat exchange effect is better. The use of micro-channel heat exchange can effectively reduce the heat exchange area, reduce the overall size of the heat exchanger, ensure the normal operation of the heat exchanger, and improve the heat exchange efficiency.

[0069] In an optional embodiment, as shown in Figure 8a and Figure 8b , two rows of outer dimple convex structures 201 are arranged on the outer side of one side wall of the flat tube 2, and the two rows of outer dimple convex structures 201 are respectively located at 2 / 5 and 4 / 5 of the length of the flat tube 2.

[0070] Optionally, the height of the outer dimple convex structure 201 is 2-3 mm, and the longitudinal spacing between adjacent outer dimple convex structures 201 is 3-4 mm.

[0071] In the embodiment, the outer dimple convex structure 201 is arranged at a certain distance outside the parallel flow flat tube 2, which induces vortex, breaks the boundary layer in the air flow direction, intensifies the exchange of cold and hot air, and expands the heat exchange area. The turbulence effect is improved, the overall heat exchange efficiency is strengthened, and at the same time, the smooth outer dimple convex structure 201 is different from the broken cross-section effect of the fin structure, which can better facilitate the drainage of condensate along the air flow and under the action of gravity to the lower side of the air outlet, and improve the occurrence of frosting and dewing under the humid working condition.

[0072] As shown in Figure 4a and Figure 4bThe air flow path schematic diagram shows that the air flow area is divided into front flat tube group heat exchange domain 401, stagnation domain 402 and rear flat tube group heat exchange domain 403. The detachable flow guide net assembly 3 is located in the middle stagnation domain 402 and mainly plays the role of air flow guide and rectification, so that the air flows to the rear flat tube group heat exchange domain more uniformly.

[0073] As shown in Figure 3a and Figure 3b In an optional embodiment, the detachable flow guide net assembly 3 includes a detachable boss 301 and a plurality of flow guide fins 302, wherein the plurality of flow guide fins 302 are installed in parallel and spaced apart on the detachable boss 301; the plurality of flow guide fins 302 are located between the flat tubes 2 of the first micro-channel parallel flow heat exchanger and the second micro-channel parallel flow heat exchanger.

[0074] The thickness of the boss 301 depends on the gap for the parallel combination of the two separate parallel flow micro-channel heat exchangers, so as to ensure that the detachable flow guide net assembly 3 is fixed in the overall heat exchanger. The flow guide fins 302 of the flow guide area extend from the boss 301 of the fixed area to the upper header and have a certain spacing from the lower header assembly.

[0075] Optionally, the upper convex height of the boss 301 is 8 mm, and the flow guide fins 302 extend downward from the base of the boss 301 and have a spacing of 10 mm from the highest point of the inclined surface of the lower header.

[0076] It should be noted that the detachable flow guide net assembly 3 has a certain gap from the edge end of the flat tube instead of being in close contact, and has a certain spacing from the lower header assembly. This can improve the flow condition of condensate water on the detachable flow guide net assembly 3 under humid conditions, improve the frosting and dewing conditions, and comprehensively improve the heat exchange performance and drainage performance.

[0077] As shown in Figure 9a and Figure 9b In an optional embodiment, the detachable flow guide net assembly 3 further includes a plurality of rectangular fin structures 303, wherein the rectangular fin structures 303 are installed downwardly inclined on the flow guide fins 302; a plurality of rectangular fin structures 303 are symmetrically arranged on both sides of each flow guide fin 302.

[0078] Optionally, the rectangular fin structures 303 are at an angle of 45° with the flow guide fins 302. The height and length of the rectangular fin structure are equal to 3 mm, and the thickness is 0.3 mm.

[0079] In this embodiment, the plurality of rectangular fin structures 303 form a longitudinal vortex generating area, which can generate vortexes in the air flow path, block the development of the air side boundary layer, enhance the mixing of cold and hot air, reduce the air temperature in this area, improve the heat exchange capacity in the latter half, prevent the local air temperature distribution from being too different, and make the air temperature more uniform.

[0080] The parallel flow heat exchanger of the composite double-sided micro-channel parallel flow heat exchanger of the embodiment is provided with parallel flat tubes with a certain angle with the horizontal air flow direction, the parallel flow flat tubes are arranged in a mirror image and in a herringbone shape, and the outer wine-goblet convex structure 201 is arranged at a certain distance outside the parallel flow flat tubes to induce vortex, break the boundary layer in the air flow direction, intensify the exchange of cold and hot air and expand the heat exchange area, the smaller the flat tube spacing, the greater the wind speed, the greater the vortex intensity, the better the flow disturbance effect, the greater the heat exchange coefficient, the more obvious the heat exchange effect, the better the air heat exchange effect, and then the flat tube width is reduced.

[0081] Moreover, the outer surface of the parallel flow flat tube is smooth and without fins, the welded flat tube side wall of the header is inclined downward to the air flow direction, the drainage performance is effectively improved under the joint action of wind force and gravity, the drainage and defrosting performance is ensured, and the air passage structure is simple, the air side pressure drop and the processing and manufacturing difficulty are reduced.

[0082] It should be noted that, in this document, the terms such as first and second are used merely to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations exist in any actual relationship or order. Moreover, the terms "include", "contain" or any other variant are intended to cover non-exclusive inclusion, so that the article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the article or device including the element. The terms "connected" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The directions or positions indicated by "up", "down", "left", "right" and the like are based on the directions or positions shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the invention.

[0083] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which should be regarded as falling within the protection scope of the present application.

Claims

1. A composite double sided microchannel parallel flow heat exchanger characterized by, The application relates to a heat exchanger, which comprises a collector assembly (1), a plurality of flat tubes (2) and a detachable flow guide net assembly (3), wherein, the collector assembly (1) comprises an upper collector assembly and a lower collector assembly, the upper collector assembly is located above the lower collector assembly, and the upper collector assembly and the lower collector assembly are communicated through the plurality of flat tubes (2); the upper collector assembly comprises a first upper collector (101) and a second upper collector (102) arranged side by side, and the lower collector assembly comprises a first lower collector (103) and a second lower collector (104) arranged side by side; the first upper collector (101) and the first lower collector (103) are communicated through a plurality of flat tubes (2) arranged in parallel and at intervals and inclined, the longitudinal axis of the flat tubes (2) is perpendicular to the horizontal plane, a first micro-channel parallel flow heat exchanger is formed, and the two ends of the first upper collector (101) are provided with a first inlet (11) and a first outlet (12); the second upper collector (102) and the second lower collector (104) are communicated through a plurality of flat tubes (2) arranged in parallel and at intervals and inclined, the longitudinal axis of the flat tubes (2) is perpendicular to the horizontal plane, a second micro-channel parallel flow heat exchanger is formed, and the two ends of the second upper collector (102) are provided with a second inlet (13) and a second outlet (14); the detachable flow guide net assembly (3) is arranged between the first micro-channel parallel flow heat exchanger and the second micro-channel parallel flow heat exchanger, and the flat tubes (2) of the first micro-channel parallel flow heat exchanger and the flat tubes (2) of the second micro-channel parallel flow heat exchanger are symmetrically arranged about the detachable flow guide net assembly (3).

2. The composite double sided microchannel parallel flow heat exchanger of claim 1, wherein, two baffle plates are arranged in the first upper collector (101) and the second upper collector (102), and the two baffle plates are respectively located at 1 / 4 and 3 / 4 of the length of the upper collector; one baffle plate is arranged in the first lower collector (103) and the second lower collector (104), and the baffle plate is located at 1 / 2 of the length of the lower collector.

3. The composite double sided microchannel parallel flow heat exchanger of claim 2, wherein, the first upper collector (101) and the second upper collector (102) are rectangular tubes; the first lower collector (103) and the second lower collector (104) are trapezoidal tubes, the side surface of the trapezoidal tube connected with the flat tube (2) is inclined, the included angle between the inclined surface and the air flow direction is 3-7 degrees, and the inclined surface is inclined downward along the air flow direction.

4. The composite double sided microchannel parallel flow heat exchanger of claim 1, wherein, the included angle between the projection of the flat tube (2) on the horizontal plane and the long side of the collector connected with the flat tube (2) is 52-55 degrees.

5. The composite double sided microchannel parallel flow heat exchanger of claim 4, wherein, a plurality of parallel flow channels are arranged in the flat tube (2), and the spacing between adjacent flat tubes (2) is 5-6 mm.

6. The composite double sided microchannel parallel flow heat exchanger of claim 4, wherein, two rows of outer wine-cave convex structures (201) are arranged on the outer side of one side wall of the flat tube (2), and the two rows of outer wine-cave convex structures (201) are respectively located at 2 / 5 and 4 / 5 of the length of the flat tube (2).

7. The composite double sided microchannel parallel flow heat exchanger of claim 6, wherein, the height of the outer wine-cave convex structure (201) is 2-3 mm, and the longitudinal spacing between adjacent outer wine-cave convex structures (201) is 3-4 mm.

8. The composite double sided microchannel parallel flow heat exchanger of claim 1, wherein, The detachable flow guide net assembly (3) comprises a detachable boss (301) and a plurality of flow guide fins (302), wherein, The plurality of flow guide fins (302) are installed in parallel and at intervals on the detachable boss (301); The plurality of flow guide fins (302) are located between the flat tubes (2) of the first and second micro-channel parallel flow heat exchangers.

9. The composite double sided microchannel parallel flow heat exchanger of claim 8, wherein, The detachable flow guide net assembly (3) further comprises a plurality of rectangular sheet structures (303), wherein, The rectangular sheet structures (303) are installed downwardly and obliquely on the flow guide fins (302); A plurality of the rectangular sheet structures (303) are symmetrically arranged on both sides of each flow guide fin (302).

10. The composite double sided microchannel parallel flow heat exchanger of claim 9, wherein, The rectangular sheet structures (303) form a 45° angle with the flow guide fins (302).

Images