Integral fin and efficient heat transfer element
Through the integral fin design and the use of staggered connection holes, diversion holes and spoiler holes, the problems of insufficient heat transfer efficiency and space utilization of fin tubes are solved, and efficient heat transfer and material saving are achieved.
Patent Information
- Application Number
- CN202423060311.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-12-12
AI Technical Summary
Existing bimetallic rolled fin tubes have deficiencies in heat transfer efficiency and space utilization. The fin part has limited thickness and the fin gap leads to space waste, resulting in a low heat transfer coefficient.
An integral fin design is adopted, with connecting holes, diverter holes and spoiler holes on the metal plate. The connecting holes are staggered, the spoiler holes increase turbulence, the guide structure is wavy, and the base tube and the fin are fixed by flanging holes to reduce the fin gap and improve heat transfer efficiency.
It greatly improves the heat transfer efficiency, reduces the fin gap, increases the effective area, improves the heat transfer coefficient and Reynolds number, and saves material costs.
Smart Images
Figure CN223425800U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of finned tubes, in particular to an integral fin and a high-efficiency heat transfer element. Background Art
[0002] Fin-and-tube heat exchangers are widely used in energy and power, petrochemicals, air conditioning, and refrigeration engineering. For example, fin-and-tube heat exchangers used in air conditioning include surface air coolers, air heaters, and fan coil units; fin-and-tube heat exchangers used in refrigeration include air cooler evaporators and frost-free refrigerator evaporators. Fin-and-tube heat exchangers are not only suitable for single-phase fluid flow but also offer significant value in phase-change heat transfer.
[0003] Finned tubes are the basic heat exchanger components of finned-tube heat exchangers. Most existing finned tubes are bimetallic rolled finned tubes. Specifically, an aluminum tube is first tightly fitted onto a base tube, and then the aluminum tube undergoes multiple processes, including rough rolling and finish rolling, to form the fins. This type of bimetallic rolled fin tube has two obvious shortcomings in terms of heat transfer: First, due to the limitations of the manufacturing process, the thickness of the fin part of the bimetallic rolled fin tube can only be about 0.4mm and cannot be uniformly thick. The fin cross-section is generally triangular, with a top thickness of 0.4mm and a bottom thickness of 0.6mm. According to Fourier's law of heat conduction, the heat transfer coefficient of heat conduction is inversely proportional to the thickness of the element. This means that when heat is transferred from the high-temperature side through the heat transfer element to the low-temperature side, the thicker the material, the lower the heat transfer coefficient. Second, the outer periphery of the fin of the bimetallic rolled fin tube is circular. Regardless of whether the multiple fin tubes inside the heat exchanger are arranged in a triangular or square manner, each fin tube has a certain gap around it and the adjacent fin tubes. This not only wastes space but also reduces the effective area of the fin tube. Utility Model Content
[0004] In order to overcome the defects in the prior art, the embodiments of the present invention provide an integral fin and a high-efficiency heat transfer element, which greatly improves the heat transfer efficiency of the heat transfer element.
[0005] An embodiment of the present application discloses: an integral fin, comprising a metal plate, wherein the metal plate comprises a first surface and a second surface arranged opposite to each other, a plurality of connection hole groups are provided on the metal plate, each connection hole group comprises a plurality of connection holes arranged in a line for mounting a base pipe, and a plurality of diversion holes are also provided on the metal plate.
[0006] Specifically, the connection holes in two adjacent connection hole groups are staggered.
[0007] Specifically, at least one diversion hole is provided between two adjacent connection holes in each connection hole group.
[0008] Specifically, the connecting hole is a first flanging hole, and the edge of the first flanging hole is located on the second surface of the metal plate.
[0009] Specifically, the diversion hole is a second flanging hole, and the edge of the second flanging hole is located on the second surface of the metal plate.
[0010] Specifically, the distance between the edges of the second flanging holes increases along the direction from the first surface to the second surface of the metal plate.
[0011] Specifically, at least two spoiler hole groups are provided between two adjacent connection hole groups. The spoiler hole groups include a plurality of spoiler holes arranged in a line, and the two spoiler hole groups are staggered.
[0012] Specifically, the spoiler hole is a blind hole, and the spoiler hole is in a hemispherical shape protruding toward the second surface of the metal plate.
[0013] Specifically, a flow-guiding structure is further provided at the edge of the metal plate, and the flow-guiding structure is wavy.
[0014] The embodiment of the present application also discloses: a high-efficiency heat transfer element, comprising a plurality of base tubes and a plurality of integral fins as described in this embodiment, wherein the plurality of base tubes are connected one-to-one with the plurality of connection holes on each integral fin, and the plurality of integral fins are evenly connected to each of the base tubes along the axial direction.
[0015] The utility model has at least the following beneficial effects:
[0016] 1. The integrated fins of this embodiment provide connection holes for mounting base tubes and diversion holes for fluid flow on the metal plate. While achieving the heat exchange function of traditional fin tubes, the gap between the fins is reduced to almost zero, greatly increasing the fin area and improving heat exchange efficiency.
[0017] 2. The integral fins of this embodiment can increase the turbulence of the medium flow and improve the Reynolds number of the medium by providing the spoiler holes, thereby improving the heat transfer coefficient and heat transfer efficiency.
[0018] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0020] Figure 1 It is a top view of the integral fin in the embodiment of the present utility model;
[0021] Figure 2 yes Figure 1 Cross-sectional view at AA in the middle;
[0022] Figure 3 yes Figure 2 A partial enlarged view of point C in the middle;
[0023] Figure 4 yes Figure 2 A partial enlarged view of point D in the middle;
[0024] Figure 5 yes Figure 2 A partial enlarged view of point E in the middle;
[0025] Figure 6 yes Figure 1 Cross-sectional view at the middle BB;
[0026] Figure 7 yes Figure 6 A partial enlarged view of point G in the middle.
[0027] The figure numbers of the above drawings are: 1, metal plate; 11, connecting hole; 12, diverter hole; 13, spoiler hole; 14, guide structure. DETAILED DESCRIPTION
[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0029] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "fixed," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.
[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but through another feature therebetween. Moreover, a first feature being "above," "below," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.
[0031] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this 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 scope of protection of this application.
[0032] In addition, the terms "first", "second", etc. are only used to distinguish in description and have no special meaning.
[0033] like Figure 1 As shown, the integrated fin of this embodiment is made of a metal plate 1, which includes a first surface and a second surface disposed opposite each other. The metal plate 1 is provided with a plurality of connection holes 11 groups, each of which includes connection holes 11 arranged in a row. These connection holes 11 are used to mount heat exchange base tubes. The metal plate 1 is also provided with a plurality of diverter holes 12, which are through-holes for allowing fluid to pass through the metal plate 1.
[0034] With the above structure, the integral fin of this embodiment provides a connection hole 11 for mounting the base tube and a diversion hole 12 for allowing fluid to pass through on the metal plate 1. While achieving the heat exchange function of traditional fin tubes, the fin gap between the base tubes is reduced to almost zero, greatly increasing the fin area and improving the heat exchange efficiency.
[0035] Specifically, if Figure 1 As shown, a group of connection holes 11 refers to a horizontal row of connection holes 11. The connection holes 11 in two adjacent groups of connection holes 11 are staggered. For example, from top to bottom, the first row of connection holes 11 is staggered with the second row of connection holes 11, and the third row of connection holes 11 is staggered with the second row of connection holes 11. This increases the number of openings.
[0036] A plurality of diversion holes 12 are evenly distributed on the metal plate 1 , and at least one diversion hole 12 is provided between two adjacent connection holes 11 in each group of connection holes 11 .
[0037] Combine Figure 2 and Figure 3 As shown, the connection hole 11 of this embodiment is a first flanging hole, the edge of which is located on the second surface of the metal plate 1. The flanging process used to create the connection hole 11 enhances the interference fit strength between the connection hole 11 and the base tube. Furthermore, the edge of the first flanging hole allows two adjacent integral fins on the base tube to abut against each other, maintaining a fixed distance between them and forming a channel for medium flow.
[0038] like Figure 1 As shown, the metal plate 1 of this embodiment is further provided with a group of spoiler holes 13. At least two groups of spoiler holes 13 are provided between two adjacent groups of connecting holes 11. Each group of spoiler holes 13 includes spoiler holes 13 arranged in a row, and the two groups of spoiler holes 13 are staggered. The spoiler holes 13 are primarily used to increase the turbulence of the medium flow, thereby raising the Reynolds number of the medium and thereby improving the heat transfer coefficient.
[0039] Combine Figure 2 and Figure 4 As shown, the diverter hole 12 of this embodiment is a second flanged hole, the edge of which is located on the second side of the metal plate 1. Specifically, the diverter hole 12 can be formed by punching two small metal pieces out of the metal plate 1 using a mold, and then flipping the two small metal pieces toward the second side of the metal plate 1. The distance between the edges of the second flanged hole gradually increases from the first side to the second side of the metal plate 1, so that the edge of the second flanged hole has a dovetail shape. Using this solution, the dovetail-shaped diverter hole 12 acts as a one-way groove, which can guide the flow direction of the gas medium so that it must pass through the flow-turbulating hole 13.
[0040] Combine Figure 2 and Figure 5 As shown, the spoiler hole 13 of this embodiment is a blind hole, which is in a hemispherical shape protruding toward the second surface of the metal plate 1 .
[0041] Combine Figure 1 、 Figure 6 and Figure 7 As shown, the edge of the metal plate 1 of this embodiment is further provided with a wave-shaped flow-guiding structure 14. The flow-guiding structure 14 can guide the flow of the inflow and outflow medium to flow smoothly toward the diversion hole 12 and the spoiler hole 13.
[0042] The integral fins of this embodiment can be made of stainless steel with a thickness of 0.15 to 0.2 mm or copper (aluminum) strip with a thickness of 0.2 to 0.25 mm through a continuous progressive die. Compared with traditional fin tubes, it can save about 30% of material and achieve the advantages of light weight and low cost.
[0043] In summary, the method for using the integral fin of this embodiment is as follows: multiple heat exchange base tubes are installed on a first integral fin, with the base tubes and the connection holes 11 of the integral fins having an interference fit. Then, multiple layers of integral fins are sequentially mounted on the multiple base tubes to assemble a high-efficiency heat transfer element. The multiple integral fins are installed in the same direction. In other words, the first surfaces of all fins face the same direction, and the second surfaces of all fins face the same direction.
[0044] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.
Claims
1. An integral fin, characterized in that: The invention comprises a metal plate, wherein the metal plate comprises a first surface and a second surface arranged opposite to each other, a plurality of connection hole groups are arranged on the metal plate, each connection hole group comprises a plurality of connection holes arranged in a line for installing a base pipe, and a plurality of diversion holes are also provided on the metal plate.
2. The integral fin according to claim 1, characterized in that: The connection holes in two adjacent connection hole groups are staggered.
3. The integral fin according to claim 1, characterized in that: At least one diversion hole is provided between two adjacent connection holes in each connection hole group.
4. The integral fin according to claim 1, characterized in that: The connecting hole is a first flanging hole, and an edge of the first flanging hole is located on the second surface of the metal plate.
5. The integral fin according to claim 1, characterized in that: The diversion hole is a second flanging hole, and the edge of the second flanging hole is located on the second surface of the metal plate.
6. The integral fin according to claim 5, characterized in that: The distance between the edges of the second flanging holes increases along a direction from the first surface to the second surface of the metal plate.
7. The integral fin according to claim 1, characterized in that: At least two spoiler hole groups are further provided between two adjacent connection hole groups. The spoiler hole groups include a plurality of spoiler holes arranged in a line, and the two spoiler hole groups are staggered.
8. The integral fin according to claim 7, characterized in that: The spoiler hole is a blind hole, and the spoiler hole is in a hemispherical shape protruding toward the second surface of the metal plate.
9. The integral fin according to claim 1, characterized in that: The edge of the metal plate is further provided with a flow guiding structure, and the flow guiding structure is wavy.
10. An efficient heat transfer element, characterized in that: The invention comprises a plurality of base tubes and a plurality of integral fins according to any one of claims 1 to 9, wherein the plurality of base tubes are connected to the plurality of connection holes on each integral fin in a one-to-one correspondence, and the plurality of integral fins are evenly connected to each base tube along the axial direction.