Fin assembly and heat exchanger

Abstract

The fin assembly comprises a flat pipe and a plurality of cooling fins arranged in the length direction of the flat pipe at intervals, each cooling fin comprises a first fin split body and a second fin split body which are oppositely arranged, the first fin split body is provided with a first U-shaped groove penetrating through the first side edge of the first fin split body, and the second fin split body is provided with a second U-shaped groove penetrating through the second side edge of the second fin split body. The second fin split body is provided with a second U-shaped groove penetrating through the edge of the first side of the second fin split body, a groove opening of the first U-shaped groove and a groove opening of the second U-shaped groove are oppositely arranged to form a matching space matched with the shape of the cross section of the flat pipe, the first U-shaped groove and the second U-shaped groove are both arranged on the flat pipe in an interference and sleeving mode, and the cooling fins are welded to the flat pipe. According to the invention, the assembly matching distance is reduced, the assembly difficulty is reduced, the deformation of the radiating fins in the assembly process of the radiating fins and the flat tubes is prevented, the appearance consistency of the fin assembly and the heat exchanger is improved, the relative determination and controllability of the positions between the fin split bodies and the flat tubes can be ensured, the welding quality is improved, and the heat exchange efficiency of the fin assembly is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchanger design, and in particular to a fin assembly and a heat exchanger. Background Art

[0002] In the traditional copper tube fin heat exchanger, after the stainless steel fin holes and heat exchange round tubes are assembled, the copper tube is expanded to fix the connection with the fin holes. However, for refrigeration systems with very large refrigerant medium flow, in order to reduce flow resistance, the heat exchange pipe diameter needs to be more than 100mm, resulting in relatively large wind resistance of the heat exchanger and difficulty in achieving fixed connection by expansion tubes. In the related technology previously applied for by the applicant, a fin with a U-shaped groove is interference fit on the flat tube, and then the two are welded together to ensure a reliable connection between the two and a high heat conduction effect. However, as the width of the flat tube increases, the depth of the U-shaped groove on the corresponding fin also increases accordingly. The interference fit process between the U-shaped groove and the flat tube is difficult, and the fin is very easy to deform, which leads to inconsistent appearance of the heat exchanger. In order to prevent the deformation of the fin during the fitting process, the prior art adopts a gap fit between the U-shaped groove and the flat tube, which also makes the position of each fin fitted on the same flat tube relative to the flat tube uncertain, which also reduces the appearance consistency of the heat exchanger. At the same time, the uncertainty of the fin position, that is, the inconsistent gap size, will lead to a reduction in the quality of welding between the two. Summary of the invention

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

[0004] The object of the present invention is to provide a fin assembly, comprising a flat tube and a plurality of heat dissipation fins arranged at intervals along the length direction of the flat tube, each of the heat dissipation fins comprising a first fin split and a second fin split arranged opposite to each other, the first fin split having a first U-shaped groove penetrating through its first side edge, the second fin split having a second U-shaped groove penetrating through its first side edge, the notch of the first U-shaped groove and the notch of the second U-shaped groove being arranged opposite to each other to form a matching space matching the cross-sectional shape of the flat tube, the first U-shaped groove and the second U-shaped groove are both interference fit on the flat tube and each of the heat dissipation fins is welded to the flat tube.

[0005] In some embodiments, a plurality of convex ribs extending along the length direction are formed on the outer wall surface of the flat tube, and the convex ribs are arranged around the flat tube at intervals in the circumferential direction of the flat tube; and / or the first fin split and the second fin split have the same structure, shape and size.

[0006] In some embodiments, the cross section of each of the ribs is semicircular.

[0007] In some embodiments, the maximum height of each rib is no greater than the height of the weld.

[0008] In some embodiments, the cross section of the flat tube is an oblong shape, and each of the convex ribs is located on two long straight sides of the oblong shape.

[0009] In some embodiments, the notches of the first U-shaped groove and the second U-shaped groove have positioning pieces folded toward one side thereof, and when each of the heat dissipating fins is assembled on the flat tube, two adjacent heat dissipating fins are positioned at a distance from each other by relying on the positioning piece provided by one of the two heat dissipating fins.

[0010] In some embodiments, the positioning piece is formed by bending the first fin body and the second fin body.

[0011] In some embodiments, the same first fin split has a plurality of first U-shaped grooves arranged at equal intervals along its first side edge, and the same second fin split has a plurality of second U-shaped grooves arranged at equal intervals along its first side edge; or, the groove depth of the first U-shaped groove is D1, the groove depth of the second U-shaped groove is D2, and the width of the flat tube is H, H-(D1+D2)>0.

[0012] In some embodiments, the number of the first U-shaped grooves on the same heat dissipation fin is 1 to 4.

[0013] The present invention also provides a heat exchanger, comprising a plurality of groups of fin assemblies, each of the fin assemblies being the aforementioned fin assembly.

[0014] The fin assembly and heat exchanger of the present invention split the integrated heat dissipation fins in the prior art into the first fin split and the second fin split of the present invention, and respectively provide a first U-shaped groove and a second U-shaped groove that can be interference fit with the outer wall of the flat tube on the first side edges opposite to each other of each fin split, so that when each heat dissipation fin is assembled with the flat tube, it is possible to avoid the assembly difficulty caused by the excessive sliding distance when the heat dissipation fins are inserted along the length direction of the flat tube in the prior art, and at the same time, it can also prevent the heat dissipation fins from being deformed during the assembly process with the flat tube, thereby improving the appearance consistency of the fin assembly and the heat exchanger. At the same time, since the interference fit method is adopted between each fin split and the flat tube, it can ensure that the position between each fin split and the flat tube is relatively fixed and controllable, which is beneficial to the welding quality between the fin split and the flat tube, and thus ensures the heat exchange efficiency of the fin assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a structural schematic diagram of a fin assembly in an embodiment of the present invention (projected along the length direction of the flat tube); Figure 2 yes Figure 1 Exploded view of the structure of the mid-fin assembly; Figure 3 yes Figure 2 A side view of the first fin segment or the second fin segment; Figure 4 It is a schematic structural diagram of a fin assembly of the present invention having two flat tubes; Figure 5 It is a schematic structural diagram of a fin assembly of the present invention having four flat tubes; Figure 6 is a schematic structural diagram of a flat tube in another embodiment of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the heat exchanger in the embodiment of the present invention.

[0016] In the figure: 1. fin assembly; 11. flat tube; 111. convex rib; 12. heat dissipation fin; 121. first fin split; 1211. first U-shaped groove; 122. second fin split; 1221. second U-shaped groove; 123. positioning piece. DETAILED DESCRIPTION

[0017] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of 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 comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. In the figures, the thickness of regions and layers are exaggerated for clarity. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0018] The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the technical solution of the present invention may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be adopted. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring various aspects of the present invention.

[0019] The following example describes a fin assembly and a heat exchanger of the present invention. This example is only a part of the embodiments of the present invention, but the protection scope of the present invention is not limited to this. All other embodiments obtained by ordinary technicians in this field without creative work should be included in the protection scope of the present invention.

[0020] Please refer to Figures 1 to 7As shown, according to an embodiment of the present invention, a fin assembly is provided, comprising a flat tube 11 and a plurality of heat dissipating fins 12 spaced apart along the length direction of the flat tube 11, each of the heat dissipating fins 12 comprising a first fin split 121 and a second fin split 122 arranged opposite to each other, the first fin split 121 having a first U-shaped groove 1211 passing through a first side edge thereof, the second fin split 122 having a second U-shaped groove 1221 passing through a first side edge thereof, the notch of the first U-shaped groove 1211 and the notch of the second U-shaped groove 1221 being arranged opposite to each other to form a matching space (not marked in the figure) matching the cross-sectional shape of the flat tube 11, the first U-shaped groove 1211 and the second U-shaped groove 1221 are both interference fit on the flat tube 11 and each of the heat dissipating fins 12 is welded to the flat tube 11.

[0021] In this technical solution, the integrated heat dissipation fin in the prior art is divided into the first fin split body 121 and the second fin split body 122 of the present invention, and the first U-shaped groove 1211 and the second U-shaped groove 1221 that can be fitted with the outer wall of the flat tube 11 by interference fit are respectively provided on the first side edges of each fin split body opposite to each other, so that when each heat dissipation fin 12 is assembled with the flat tube 11, the opposite sides (such as Figure 2 As shown in the figure, the heat dissipation fins 12 are arranged perpendicular to the length direction of the flat tube 11, thereby avoiding the assembly difficulty caused by the large sliding distance when the heat dissipation fins are inserted (i.e., installed) along the length direction of the flat tube 11 in the prior art. At the same time, the heat dissipation fins 12 can be prevented from being deformed during the assembly process with the flat tube 11, thereby improving the appearance consistency of the fin assembly and the heat exchanger. At the same time, since the interference fit method is adopted between each fin split and the flat tube 11, the position between each fin split and the flat tube 11 can be ensured to be relatively determined and controllable, which is beneficial to the welding quality between the fin split and the flat tube 11, thereby ensuring the heat exchange efficiency of the fin assembly.

[0022] In a preferred embodiment, the same first fin split 121 has a plurality of first U-shaped grooves 1211 arranged at equal intervals along its first side edge, and the same second fin split 122 has a plurality of second U-shaped grooves 1221 arranged at equal intervals along its first side edge. It can be understood that the number of the first U-shaped grooves 1211 and the second U-shaped grooves 1221 are equal, and after the two are assembled with the flat tubes 11, their positions correspond one to one, so that a plurality of parallel flat tubes 11 can be synchronously arranged in the fin assembly, thereby improving the assembly efficiency of the heat exchanger using it.

[0023] For details, see 4 and Figure 5 As shown in Figure 4 FIG. 1 shows a case where two flat tubes 11 are arranged in a set of fin assemblies. Figure 5FIG. 3 shows a situation where four flat tubes 11 are arranged in a set of fin assemblies.

[0024] In a preferred embodiment, the welding between the heat dissipating fins 12 and the flat tubes 11 is specifically achieved by furnace brazing, which can ensure efficient heat conduction between the heat dissipating fins 12 and the flat tubes 11 and can also significantly improve the manufacturing efficiency of the fin assembly.

[0025] In order to ensure that the fin assembly can be brazed in a furnace, in a specific embodiment, the number of the first U-shaped grooves 1211 on the same heat dissipating fin 12 is 1 to 4, so as to ensure that the overall size of the formed fin assembly can be sent into the brazing furnace (tunnel welding furnace).

[0026] In other embodiments, see Figure 6 As shown, a plurality of convex ribs 111 extending along the length direction are formed on the outer wall surface of the flat tube 11, and in the circumferential direction of the flat tube 11, the convex ribs 111 are arranged at intervals around the flat tube 11. It can be understood that at this time, the heat dissipating fins 12 objectively form an interference fit with the convex ribs 111.

[0027] In this technical solution, a plurality of spaced convex ribs 111 are formed on the outer wall surface of the flat tube 11, which can reduce the contact area during the plug-in assembly process of the heat dissipating fins 12 and the flat tube 11, reduce the friction resistance at the mating surfaces during the assembly process, and further improve the assembly smoothness of the first fin split 121 and the second fin split 122 and the flat tube 11.

[0028] In a preferred embodiment, the first fin body 121 and the second fin body 122 have the same structure, shape and size, so that the first fin body 121 and the second fin body 122 can be made of the same material and process, reducing the types of material production and simplifying production material management.

[0029] In a preferred embodiment, the cross section of each convex rib 111 is semicircular, so that the contact area between the heat dissipating fin 12 and the flat tube 11 during assembly can be minimized, that is, the assembly friction resistance can be minimized. The convex rib 111 can be specifically realized by embossing the outer wall surface of the profile of the flat tube 11 and then machining it.

[0030] In order to ensure the welding quality between the heat dissipating fins 12 and the flat tubes 11, in some embodiments, the maximum height of each of the convex ribs 111 is not greater than the weld height, so as to prevent the convex rib 111 from being too high, resulting in a large gap between the inner wall of the U-shaped groove of the heat dissipating fins 12 and the flat tubes 11 due to the setting of the convex rib 111, resulting in welding defects such as cold welding, thereby ensuring the welding quality and heat exchange efficiency.

[0031] The cross section of the flat tube 11 is an oblong, and each of the convex ribs 111 is located on two long straight sides of the oblong, that is, no convex rib 111 is provided on the outer wall surface corresponding to the circular edge of the oblong, so that the bottom arc surface of the U-shaped groove and the side arc surface of the flat tube 11 can be used to form a reliable positioning of the fin split.

[0032] In some embodiments, the notches of the first U-shaped groove 1211 and the second U-shaped groove 1221 have positioning pieces 123 folded toward one side thereof. When each of the heat dissipating fins 12 is assembled on the flat tube 11, two adjacent heat dissipating fins 12 are positioned at a distance from each other by relying on the positioning piece 123 provided on one of the two heat dissipating fins 12. The positioning piece 123 is formed by bending the first fin body 121 and the second fin body 122. The width of the heat exchange channel formed between two adjacent heat dissipating fins 12 is limited by selecting the extension length of each positioning piece 123, and the structure is simple.

[0033] See Figure 2 As shown, in some embodiments, the groove depth of the first U-shaped groove 1211 is D1, the groove depth of the second U-shaped groove 1221 is D2, the width of the flat tube 11 is H, and H-(D1+D2)>0. That is, after each first fin split 121 and the second fin split 122 are relatively inserted and assembled on the flat tube 11, the relative edges of the two fin splits (that is, the aforementioned first edges) do not contact each other but there is a certain gap, which can prevent the fin splits from contacting each other due to size deviation and causing the two to collide, deform and bend. It can be understood that the size of the gap formed between the two fin splits should not be too large, and the specific size of the gap can be reasonably determined based on the dimensional accuracy of the heat dissipation fins.

[0034] The types of the heat dissipation fins 12 include but are not limited to: flat sheets, corrugated sheets, window sheets, sinusoidal corrugated sheets, pockmarked sheets, etc. The edges can be designed to be straight or corrugated or embossed with sinusoidal waves to improve the heat exchange efficiency.

[0035] According to the embodiments of the present invention, see Figure 7 As shown, a heat exchanger is also provided, comprising a plurality of groups of fin assemblies 1, each of the fin assemblies 1 being the aforementioned fin assembly.

[0036] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fin assembly, characterized in that: The invention comprises a flat tube (11) and a plurality of heat dissipation fins (12) arranged at intervals along the length direction of the flat tube (11), each heat dissipation fin (12) comprising a first fin split (121) and a second fin split (122) arranged opposite to each other, the first fin split (121) having a first U-shaped groove (1211) penetrating the first side edge thereof, the second fin split (122) having a second U-shaped groove (1221) penetrating the first side edge thereof, the notch of the first U-shaped groove (1211) and the notch of the second U-shaped groove (1221) being arranged opposite to each other to form a matching space matching the cross-sectional shape of the flat tube (11), the first U-shaped groove (1211) and the second U-shaped groove (1221) both being interference-fitted on the flat tube (11), and each heat dissipation fin (12) is welded to the flat tube (11).

2. The fin assembly according to claim 1, characterized in that: A plurality of convex ribs (111) extending along the length direction of the flat tube (11) are formed on the outer wall surface of the flat tube (11), and in the circumferential direction of the flat tube (11), the convex ribs (111) are arranged at intervals around the flat tube (11); and / or the first fin segment (121) and the second fin segment (122) have the same structure, shape and size.

3. The fin assembly according to claim 2, characterized in that: The cross section of each convex rib (111) is semicircular.

4. The fin assembly according to claim 2 or 3, characterized in that: The maximum height of each convex rib (111) is no greater than the height of the weld.

5. The fin assembly according to claim 2 or 3, characterized in that: The cross section of the flat tube (11) is an oblong shape, and each of the convex ribs (111) is located on two long straight sides of the oblong shape.

6. The fin assembly according to claim 1, characterized in that: The notches of the first U-shaped groove (1211) and the second U-shaped groove (1221) are provided with positioning pieces (123) folded toward one side thereof, and when each of the heat dissipation fins (12) is assembled on the flat tube (11), two adjacent heat dissipation fins (12) are positioned at a distance from each other by means of the positioning piece (123) provided on one of the two.

7. The fin assembly according to claim 6, characterized in that: The positioning piece (123) is formed by bending the first fin split body (121) and the second fin split body (122).

8. The fin assembly according to claim 1, characterized in that: The same first fin split (121) has a plurality of first U-shaped grooves (1211) arranged at equal intervals along its first side edge, and the same second fin split (122) has a plurality of second U-shaped grooves (1221) arranged at equal intervals along its first side edge; or, the groove depth of the first U-shaped groove (1211) is D1, the groove depth of the second U-shaped groove (1221) is D2, the width of the flat tube (11) is H, and H-(D1+D2)>0.

9. The fin assembly according to claim 8, characterized in that: The number of the first U-shaped grooves (1211) on the same heat dissipation fin (12) is 1 to 4.

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

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