Fin assembly and heat exchanger

Abstract

The utility model provides a fin assembly and a heat exchanger, the fin assembly comprises a flat tube and a plurality of radiating fins arranged at intervals along the length direction of the flat tube, each radiating fin is provided with a flat tube inserting hole penetrating through two sides of the radiating fin, and the flat tube inserting holes are communicated with the flat tube inserting holes. The outer side walls of the flat pipes are sleeved with the hole walls of the flat pipe inserting holes in a clearance mode, and the flat pipes and the cooling fins are welded. According to the heat exchanger, the wind resistance of the heat exchanger can be obviously reduced, the flat tubes and the flat tube mounting holes of the radiating fins are in clearance sleeving and welding connection, so that the assembly between the radiating fins and the flat tubes can be simplified, and the heat exchange efficiency between the flat tubes and the radiating fins is improved.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger design technology, specifically to a finned assembly and a heat exchanger. Background Technology

[0002] Traditional copper tube finned heat exchangers assemble stainless steel finned tubes and finned tubes, then fix the copper tubes to the finned tubes by expanding the tubes. However, for refrigeration systems with very high refrigerant flow rates, the heat exchange tube diameter needs to be over 100mm to reduce flow resistance, resulting in high air resistance and making the expansion tube fixing method difficult to implement. To overcome the high air resistance of finned assemblies composed of finned tubes and fins at large sizes, related technologies use flat tubes instead of finned tubes. Flat tubes are thinner, thus reducing air resistance. However, because the heat dissipation fins in the finned assembly are large, and to ensure the heat exchange effect of the finned assembly, the heat dissipation fins are interference-fitted onto the outside of the flat tube and welded together. This leads to excessive frictional resistance between the heat dissipation fins and the flat tube during assembly, causing the heat dissipation fins to deform after assembly. This affects the uniformity of the heat exchanger's appearance and makes the heat exchange performance uncontrollable due to the uncertain size of the heat exchange flow channel. Utility Model Content

[0003] The finned assembly and heat exchanger designed in this invention can at least partially solve the above problems.

[0004] The purpose of this utility model is to provide a fin assembly, including a flat tube and a plurality of heat dissipation fins spaced apart along the length of the flat tube. Each heat dissipation fin has a flat tube insertion hole that passes through both sides of it. The wall of the flat tube insertion hole is fitted onto the outer wall of the flat tube, and the flat tube is welded to the heat dissipation fin.

[0005] In some embodiments, multiple raised ribs extending along the length direction are formed on the outer wall surface of the flat tube, and each of the raised ribs is arranged at intervals around the flat tube in the circumferential direction.

[0006] In some embodiments, the cross-section of each of the ribs is semi-circular; and / or, the maximum height of each of the ribs is not greater than the weld height.

[0007] In some embodiments, the flat tube has an oblong cross-section, and each of the ribs is located on the two long straight sides of the oblong.

[0008] In some embodiments, the flat tube insertion hole is also oblong, and the arcuate wall of the flat tube insertion hole fits against the arcuate wall of the flat tube.

[0009] In some embodiments, the opening of the flat tube insertion hole has a positioning piece that folds towards one side. When each of the heat dissipation fins is assembled on the flat tube, the distance between two adjacent heat dissipation fins is determined by the positioning piece of one of them.

[0010] In some embodiments, the positioning piece is formed by bending the heat dissipation fins.

[0011] In some embodiments, the heat dissipation fins are of one type: flat fins, corrugated fins, open-window fins, sinusoidal corrugated fins, and dotted fins; and / or, the edges of the heat dissipation fins have sinusoidal corrugated embossing.

[0012] In some embodiments, the number of flat tube insertion holes on the same heat dissipation fin is 1 to 4.

[0013] This utility model also provides a heat exchanger, including multiple sets of fin assemblies, each of which is the fin assembly described above.

[0014] This utility model also provides a heat exchanger, including multiple sets of fin assemblies, each of which is the fin assembly described above.

[0015] The finned assembly and heat exchanger of this utility model, on the one hand, use flat tubes instead of the heat exchange round tubes in the prior art. The flat tubes have a smaller thickness, thus significantly reducing the wind resistance of the heat exchanger. On the other hand, the gap between the flat tube and the mounting hole of the flat tube of the heat dissipation fins and the welding connection can simplify the assembly between the heat dissipation fins and the flat tubes and improve the heat exchange efficiency between the flat tubes and the heat dissipation fins. In addition, the flat tubes and multiple heat dissipation fins in this technical solution can be assembled into one unit and placed in a tunnel brazing furnace for welding, which can significantly improve production efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the fin assembly in an embodiment of the present invention (projected along the length of the flat tube).

[0017] Figure 2 yes Figure 1 Schematic diagram of the structure of the heat dissipation fins;

[0018] Figure 3 yes Figure 2 Side view of the heat dissipation fins;

[0019] Figure 4 This is a schematic diagram of a flat tube in one embodiment of the present utility model;

[0020] Figure 5 This is a three-dimensional structural diagram of the heat exchanger in an embodiment of this utility model.

[0021] In the picture:

[0022] 1. Fin assembly; 11. Flat tube; 111. Rib; 12. Heat dissipation fin; 121. Flat tube insertion hole; 122. Positioning plate. Detailed Implementation

[0023] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. In the drawings, for clarity, the thickness of regions and layers is exaggerated. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed descriptions will be omitted.

[0024] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of the present invention. However, those skilled in the art will recognize that the technical solutions of the present invention can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the present invention.

[0025] The following examples describe finned assemblies and heat exchangers of this utility model. These examples are only a portion of the embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. All other embodiments obtained by those skilled in the art without inventive effort should be covered within the scope of protection of this utility model.

[0026] Please refer to Figures 1 to 5 As shown, according to an embodiment of the present invention, a fin assembly is provided, including a flat tube 11 and a plurality of heat dissipation fins 12 spaced apart along the length direction of the flat tube 11. Each heat dissipation fin 12 has a flat tube insertion hole 121 extending through both sides thereof. The hole wall of the flat tube insertion hole 121 is fitted onto the outer wall of the flat tube 11 with a gap, and the flat tube 11 is welded to the heat dissipation fin 12.

[0027] In this technical solution, on the one hand, a flat tube 11 is used to replace the heat exchanger round tube in the existing technology. The flat tube 11 has a smaller thickness, thus significantly reducing the air resistance of the heat exchanger. On the other hand, the gap between the flat tube 11 and the mounting hole 21 at the flat tube of the heat dissipation fin 12 and the flat tube 11 is fitted and welded together, which simplifies the assembly between the heat dissipation fin 12 and the flat tube 11 and improves the heat exchange efficiency between the flat tube 11 and the heat dissipation fin 12. It can be understood that the flat tube 11 and multiple heat dissipation fins 12 in this technical solution can be assembled into a single unit and placed in a tunnel brazing furnace for welding, which can significantly improve production efficiency.

[0028] In some embodiments, the number of flat tube insertion holes 121 on the same heat dissipation fin 12 is 1 to 4, which ensures that the overall size of the fin assembly is not too large, so that the overall size of the assembled fin assembly can meet the size requirements for being sent into the brazing furnace (tunnel welding furnace).

[0029] In some embodiments, multiple ribs 111 extending along the length direction are formed on the outer wall surface of the flat tube 11. In the circumferential direction of the flat tube 11, each of the ribs 111 is arranged at intervals around the flat tube 11. In this case, the inner wall of the flat tube insertion hole 121 can form an interference fit with the ribs 111.

[0030] In this technical solution, forming multiple spaced ribs 111 on the outer wall of the flat tube 11 can reduce the contact area during the interlocking assembly of the heat dissipation fins 12 and the flat tube 11, and reduce the frictional resistance at the mating surfaces during assembly. This allows the heat dissipation fins 12 to be assembled with the ribs 111 in an interference fit, thereby achieving positional stability of the heat dissipation fins 12 after assembly with the flat tube 11. This, in turn, ensures the welding quality of both the flat tube 11 and the heat dissipation fins 12, and ensures heat exchange efficiency.

[0031] In a preferred embodiment, the cross-section of each of the protruding ribs 111 is semi-circular, which minimizes the contact area between the heat dissipation fins 12 and the flat tube 11 during assembly, thereby minimizing assembly friction resistance. Specifically, the aforementioned protruding ribs 111 can be achieved by machining the outer wall surface of the flat tube 11 profile after pressing ribs.

[0032] To ensure the welding quality between the heat dissipation fins 12 and the flat tube 11, in some embodiments, the maximum height of each of the protruding ribs 111 is not greater than the weld height. This prevents welding defects such as incomplete welding caused by excessively large gaps between the inner wall of the U-shaped groove of the heat dissipation fins 12 and the flat tube 11 due to the protruding ribs 111, thus ensuring welding quality and heat exchange efficiency.

[0033] The flat tube 11 has an elongated oval cross-section, and each of the protruding ribs 111 is located on the two long straight sides of the elongated oval. That is, no protruding ribs 111 are provided on the outer wall surface corresponding to the circular edge of the elongated oval. Furthermore, the flat tube insertion hole 121 is also elongated oval, and the arcuate wall surface of the flat tube insertion hole 121 fits into the arcuate wall surface of the flat tube 11. In this way, the arcuate wall surface of the flat tube insertion hole 121 and the side arcuate wall surface of the flat tube 11 can be used to reliably position the heat dissipation fins 12.

[0034] In some embodiments, the opening of the flat tube insertion hole 121 has a positioning piece 122 folded towards one side. When each of the heat dissipation fins 12 is assembled onto the flat tube 11, adjacent heat dissipation fins 12 are positioned relative to each other by the positioning piece 122 of one of them. The positioning piece 122 is formed by bending the heat dissipation fin 12. The width of the heat exchange channel formed between adjacent heat dissipation fins 12 is limited by selecting the extension length of each positioning piece 123, resulting in a simple structure.

[0035] The aforementioned heat dissipation fins 12 include, but are not limited to: flat fins, corrugated fins, open window fins, sinusoidal corrugated fins, and dotted fins, etc. The edges can be designed with straight lines or corrugated and sinusoidal embossed patterns to improve their heat exchange efficiency.

[0036] According to the embodiments of this utility model, see details below. Figure 5 As shown, a heat exchanger is also provided, including multiple sets of fin assemblies 1, each of the fin assemblies 1 being the fin assembly described above.

[0037] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0038] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A finned assembly, characterized in that, It includes a flat tube (11) and a plurality of heat dissipation fins (12) spaced apart along the length of the flat tube (11). Each heat dissipation fin (12) has a flat tube insertion hole (121) that passes through both sides of it. The hole wall of the flat tube insertion hole (121) is fitted onto the outer side wall of the flat tube (11), and the flat tube (11) is welded to the heat dissipation fin (12).

2. The finned assembly according to claim 1, characterized in that, Multiple ribs (111) extending along the length direction are formed on the outer wall surface of the flat tube (11). In the circumferential direction of the flat tube (11), each of the ribs (111) is arranged at intervals around the flat tube (11).

3. The finned assembly according to claim 2, characterized in that, The cross-section of each of the ribs (111) is semi-circular; and / or, the maximum height of each of the ribs (111) is not greater than the weld height.

4. The finned assembly according to claim 1, characterized in that, The flat tube (11) has an elongated oval cross section, and each of the protruding ribs (111) is located on the two long straight sides of the elongated oval.

5. The finned assembly according to claim 4, characterized in that, The flat tube insertion hole (121) is also oblong, and the arc wall of the flat tube insertion hole (121) fits the arc wall of the flat tube (11).

6. The finned assembly according to claim 1, characterized in that, The flat tube insertion hole (121) has a positioning piece (122) that is folded to one side. When each of the heat dissipation fins (12) is assembled on the flat tube (11), two adjacent heat dissipation fins (12) are positioned by the positioning piece (122) of one of them.

7. The finned assembly according to claim 6, characterized in that, The positioning piece (122) is formed by bending the heat dissipation fins (12).

8. The finned assembly according to claim 1, characterized in that, The heat dissipation fins (12) are of one type: flat fins, corrugated fins, open-window fins, sinusoidal corrugated fins, and dotted fins; and / or, the edges of the heat dissipation fins (12) have sinusoidal corrugated embossing.

9. The finned assembly according to claim 1, characterized in that, The number of flat tube insertion holes (121) on the same heat dissipation fin (12) is 1 to 4.

10. A heat exchanger comprising multiple sets of finned assemblies (1), characterized in that, Each of the fin assemblies (1) is the fin assembly according to any one of claims 1 to 9.

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