Heat exchange finned tube

Abstract

The utility model relates to a heat exchange finned tube, which comprises a metal inner tube and an aluminum fin structure which is coaxially arranged, the aluminum fin structure is tightly sleeved on the outer wall of the metal inner tube, the aluminum fin structure comprises a finned tube main body and fins, the finned tube main body is of a star-shaped structure, and the fins are arranged in the finned tube main body. The fins extend to the periphery in the radial direction of the star-shaped structure. The fin is simple in structure and low in cost, few raw materials are adopted, the machining process is simple, the cost is low, the form and size of the fin can be configured or adjusted according to different use scenes, the fin structure is tightly matched with the metal inner pipe, and the heat diffusion performance is excellent.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology, and in particular to a heat exchange finned tube for fluid heat transfer. Background Technology

[0002] Finned tubes are a type of heat exchange element. To improve heat exchange efficiency, fins are typically added to the surface of the heat exchange tube to increase its outer surface area, thereby improving heat exchange efficiency. Finned tubes are widely used in industrial production and have a large market demand.

[0003] Aluminum, as a good thermal conductor, is often used in the production of finned tubes. However, in actual production, due to the low strength of aluminum, the aluminum substrate is prone to breakage during the production process, making traditional finned tube production equipment unsuitable. Developing new production equipment would face problems such as complex production processes, low yield, and high production costs.

[0004] Therefore, it is particularly important to develop an aluminum heat exchange finned tube that is low in cost, high in strength, and has good heat exchange performance. Summary of the Invention

[0005] The purpose of this invention is to provide a heat exchange finned tube, comprising a metal inner tube and coaxially arranged aluminum fin structures. The aluminum fin structures are tightly fitted onto the outer wall of the metal inner tube. Each aluminum fin structure includes a finned tube body and fins. The finned tube body has a star-shaped structure, and the fins extend radially outwards according to the star-shaped structure. The star-shaped structure is divided into three or more equal parts extending outwards. This heat exchange finned tube has a simple structure, is easy to manufacture, has a high yield rate, and provides excellent heat dissipation performance.

[0006] Preferably, the fins are continuous filamentous bent fins, sheet-like fins, or needle-like fins, and preferably have a structure that uses less material, has a good heat exchange effect, and is simple to process.

[0007] Preferably, the finned tube body wraps around at least three-quarters of the inner metal tube in the axial direction, which saves material and reduces cost, but does not affect the heat diffusion performance.

[0008] Preferably, the length of the fins along the radial direction of the inner metal tube is greater than the diameter of the inner metal tube, and more preferably greater than twice the diameter of the inner metal tube, in order to maintain a larger heat exchange area and heat exchange zone.

[0009] Preferably, the aluminum fin structure is an integrated structure, and the fin tube body and the fin integrated structure are integrally formed. Specifically, they are integrally extruded during production, so that the various parts of the fin structure are in close contact and fit together, which can achieve a better heat exchange effect.

[0010] Preferably, the star-shaped structure includes at least three uniformly arranged external diffusion units. In actual use, the more external diffusion units there are, the better the heat exchange effect. However, it is necessary to comprehensively consider the relationship between material cost and heat diffusion effect and optimize the selection of the number of external diffusion units.

[0011] Furthermore, the outer diffuser unit has a slit structure at its end, and the fins are closely arranged in the slit structure. The fins can better transfer the heat of the metal inner tube to the surrounding medium, or the fins can transfer the heat of the surrounding medium to the heat transfer medium in the metal inner tube.

[0012] Preferably, the adjacent fins connected to the external diffusion unit are arranged at a certain angle and staggered. This arrangement can effectively shorten the heat transfer time and improve the efficiency of heat exchange between the fins and the surrounding medium.

[0013] Preferably, the specified angle is less than or equal to 90°. More preferably, the specified angle is greater than 360° divided by twice the number of the external diffusion units. For example, when the star-shaped structure includes four evenly arranged external diffusion units, the angle of the staggered arrangement of adjacent fins is greater than 360 / 4 / 2 = 45° and less than 90°. When the star-shaped structure includes other numbers of external diffusion units, the preferred angle of the staggered arrangement of adjacent fins is also determined according to this principle.

[0014] This utility model proposes a heat exchange finned tube, which uses aluminum as the raw material for the finned tube, resulting in excellent thermal conductivity; it uses fewer raw materials, resulting in low cost; it can be manufactured as an integrated structure or produced separately and then spliced, making the production process simple and reliable; the fin shape and size can be configured or adjusted according to different application scenarios; the fin structure is tightly fitted with the metal inner tube, resulting in excellent heat diffusion performance. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a simplified diagram of a heat exchange finned tube structure;

[0017] Figure 2 This is a front view of a heat exchange finned tube;

[0018] Figure 3 This is an end view of a heat exchange finned tube;

[0019] Figure 4 This is a simplified diagram of another type of heat exchange finned tube structure;

[0020] Figure 5 This is a front view of another type of heat exchange finned tube;

[0021] Figure 6 This is an end view of another type of heat exchange finned tube.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1 is a continuous filamentous bent fin, 2 is a metal inner tube, 3 is the finned tube body, 4 is an external diffusion unit, and 5 is a sheet-like fin. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1:

[0026] like Figure 1-3 The figures shown are a simplified structural diagram, a front view, and an end view of a heat exchange finned tube. The heat exchange finned tube includes a metal inner tube 2 and coaxially arranged aluminum fin structures. The aluminum fin structures are tightly fitted onto the outer wall of the metal inner tube 2. The aluminum fin structure includes a finned tube body 3 and fins. The inner side of the finned tube body 3 is a cylindrical structure that wraps around the metal inner tube 2. The cylindrical structure is concentrically arranged with the metal inner tube 2. The outer side of the finned tube body 3 is a star-shaped structure. The fins extend radially outwards according to the star-shaped structure. The star-shaped structure is divided into three or more equal parts and extends outwards. The heat exchange finned tube has a simple structure, is easy to manufacture, has a high yield rate, and excellent heat dissipation performance.

[0027] Preferably, the aluminum fin structure is an integrated structure, and the finned tube body 3 and the fins are integrally extruded and formed, so that the finned tube body 3 and the fins are in close contact and fit together, which can achieve a better heat exchange effect.

[0028] The fins are continuous filamentous bent fins, plate-shaped fins, or needle-shaped fins, preferably with a structure that uses less material, has good heat exchange effect, and is simple to process, such as... Figure 1-3As shown, the continuous filamentary bent fin 1 is used as an example for illustration, but the following structure is also applicable when other structures are used for the fins. The continuous filamentary bent fin 1 is formed by bending an aluminum wire multiple times, with each bend in the opposite direction to the previous bend, forming a structure consisting of multiple straight sections and multiple bends connected sequentially. That is, the two ends of one bend of the continuous filamentary bent fin 1 are respectively connected to two straight sections, and the two adjacent straight sections are parallel to each other or their extensions intersect at a point; the two ends of one straight section are respectively connected to two bends with opposite bending directions, and the bending arcs of the two bends at the two ends of one straight section are the same or different. Preferably, the length of the continuous filamentary bent fin 1 along the radial direction of the metal inner tube 2 is greater than the diameter of the metal inner tube 2. More preferably, the length of the continuous filamentary bent fin 1 is greater than twice the diameter of the metal inner tube, in order to maintain a larger heat exchange area and heat exchange zone.

[0029] Preferably, the star-shaped structure includes at least three uniformly arranged outer diffusion units 4, such as... Figure 1-3 As shown, the star-shaped structure includes four evenly arranged external diffusion units 4. In actual use, the more external diffusion units 4 there are, the better the heat exchange effect. However, the relationship between material cost and heat diffusion effect needs to be comprehensively considered to optimize the selection of the number of external diffusion units 4. Figure 3 As shown, preferably, the end of the external diffusion unit 4 away from the finned tube body 3 has a slit structure, and the continuous filamentous bent fins 1 are closely arranged in the slit structure. The continuous filamentous bent fins 1 can better transfer the heat of the metal inner tube 2 to the surrounding medium, or the continuous filamentous bent fins 1 can transfer the heat of the surrounding medium to the heat transfer medium in the metal inner tube 2. A single external diffusion unit 4 extends along the axial direction of the metal inner tube 2, and the slit structure also extends along the axial direction of the metal inner tube 2. Preferably, the length of the outer diffuser unit 4 along the axial direction of the inner metal tube 2 is approximately equal to the length of the inner metal tube 2, the length of the slot structure along the axial direction of the inner metal tube 2 is approximately equal to the length of the inner metal tube 2, and the length of the continuous filamentary bent fin 1 along the axial direction of the inner metal tube 2 is approximately equal to the length of the inner metal tube 2. That is, the lengths of the inner metal tube 2, the outer diffuser unit 4, the slot structure, and the continuous filamentary bent fin 1 along the axial direction of the inner metal tube 2 are similar. Therefore, only one slot structure is provided on each outer diffuser unit 4, and one continuous filamentary bent fin 1 is provided in each slot structure. This simplifies the manufacturing process of the aluminum fin structure and increases the connection strength between the continuous filamentary bent fin 1 and the slot structure. The density of the straight sections can be controlled according to the number of inserted continuous filamentary bent fins 1 and the bending dimensions of the continuous filamentary bent fins 1, thereby adjusting the heat dissipation performance of the aluminum fin structure.

[0030] During production, the aluminum fin structure with a slot structure can be manufactured separately, consisting of a finned tube body 2 with an external diffusion unit 4 and continuous filamentous bent fins 1. Then, the continuous filamentous bent fins 1 are inserted into the slot structure, and the end of the fins 1 that are attached to each other is separated from the metal inner tube 2.

[0031] Preferably, the adjacent fins connected to the external diffuser unit are arranged in an alternating angle. When the fins are continuous filamentary bent fins 1, the aforementioned adjacent fins refer to a structure consisting of two adjacent straight sections and a bent section connecting these two straight sections, and the bent section is not inserted into the slot structure but is located on the side away from the metal inner tube 2. When arranged in an alternating manner, the portion of the bent straight section extending out of the slot structure bends the fin. This arrangement can effectively shorten the heat transfer time and improve the efficiency of heat exchange between the fins and the surrounding medium. Preferably, the certain angle is less than or equal to 90°. More preferably, the certain angle is greater than 360° divided by twice the number of external diffuser units. For example, when the star-shaped structure includes four evenly arranged external diffuser units, the alternating angle of the adjacent fins is greater than 360 / 4 / 2 = 45° and less than 90°. Figure 3 As shown, the specified angle is 90°. When the star-shaped structure includes other numbers of external diffusion units, the preferred angle for the staggered arrangement of the adjacent fins is also determined according to this principle. Figure 3 As shown in Figure A, the finned tube body 3 wraps around at least three-quarters of the inner metal tube 2 in the axial direction, saving material and reducing cost, while the heat diffusion performance is basically unaffected. Figure 3 As shown in Figure B, the finned tube body 3 wraps around the entire metal inner tube 2 in the axial direction. Although the amount of material used is increased, the heat diffusion capacity is enhanced.

[0032] In some embodiments, at least two continuous filamentary bent fins 1 are provided in a slot structure. The at least two continuous filamentary bent fins 1 are inserted into the slot structure with one side of each other. The sides of the two continuous filamentary bent fins 1 away from the metal inner tube 2 are inclined in opposite directions, and the inclination direction of the continuous filamentary bent fins 1 is perpendicular to the axial direction of the metal inner tube 2. In some embodiments, a continuous filamentary bent fin 1 is formed by bending metal wire. A continuous filamentary bent fin 1 includes only two straight parts and a bent part connecting the straight parts. During installation, the end of the straight part away from the bending structure is inserted into the slot structure. A slot structure is provided with multiple continuous filamentary bent fins 1, and the multiple continuous filamentary bent fins 1 are arranged adjacent to each other.

[0033] Example 2:

[0034] like Figure 4-6 The figures shown are a simplified structural diagram, a front view, and an end view of another type of heat exchange finned tube.

[0035] The difference between Example 2 and Example 1 is as follows:

[0036] (1) The fins are plate-shaped fins 5, such as Figure 5 As shown, the sheet-like fin 5 is a rectangular aluminum sheet, with its short side connected to the finned tube body. In some embodiments, the sheet-like fin 5 can also be a triangular, trapezoidal, elliptical, or irregularly shaped sheet; no limitation is made here, and those skilled in the art can choose according to actual materials and requirements. The sheet-like fin 5 is connected to the finned tube body with its shorter side. The sheet-like fin 5 is easier to integrate with the finned tube body for integrated processing, making the process simpler and more convenient. It should be noted that in practical applications, any fin form that can easily achieve high-efficiency heat exchange and processing falls within the protection scope of this utility model. In some embodiments, the sheet-like fin 5 can also be embedded in a slot structure to connect with the finned tube body.

[0037] (2) Figure 3 As shown, the adjacent fins connected to the external diffusion unit are arranged in an alternating manner at a certain angle, which is 60°. In this embodiment, the angle between adjacent sheet-like fins 5 is between 45° and 90°.

[0038] It should be noted that the angle of the adjacent sheet-like fins 5 connected within the aforementioned external diffusion unit is only one form in implementation. Other angles are not listed here, but all fall within the protection scope of this utility model.

[0039] The heat exchange finned tube proposed in this utility model has the following beneficial effects:

[0040] (1) It has good heat dissipation performance and improves the heat exchange efficiency of heat exchange tubes;

[0041] (2) Simple structure, long service life, wide range of applications, and low production cost;

[0042] (3) The processing methods are diversified. They can be manufactured as a whole, resulting in high structural strength, or they can be molded separately and then assembled, which facilitates transportation.

[0043] It should be understood that this invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this invention is limited only by the appended claims.

Claims

1. A heat exchange finned tube, characterized in that, The device includes a metal inner tube and a coaxially arranged aluminum fin structure. The aluminum fin structure is tightly fitted onto the outer wall of the metal inner tube. The aluminum fin structure includes a finned tube body and fins. The finned tube body has a star-shaped structure, and the fins are arranged radially in all directions according to the star-shaped structure.

2. The heat exchange finned tube according to claim 1, characterized in that, The fins are continuous filamentous bent fins, plate-shaped fins, or needle-shaped fins.

3. The heat exchange finned tube according to claim 2, characterized in that, The finned tube body wraps around at least three-quarters of the inner metal tube in the axial direction.

4. The heat exchange finned tube according to claim 3, characterized in that, The length of the fin along the radial direction of the inner metal tube is greater than the diameter of the inner metal tube.

5. The heat exchange finned tube according to claim 1, characterized in that, The aluminum fin structure is an integrated structure.

6. The heat exchange finned tube according to claim 1, characterized in that, The star-shaped structure includes at least three uniformly arranged outer diffusion units.

7. The heat exchange finned tube according to claim 6, characterized in that, Each of the external diffusion units has a slit structure at its end, and the fins are closely arranged in the slit structure.

8. The heat exchange finned tube according to claim 5 or 7, characterized in that, The adjacent fins connected to the external diffusion unit are arranged in an alternating manner at a certain angle.

9. The heat exchange finned tube according to claim 8, characterized in that, The specified angle is less than or equal to 90°.

Images