An enhanced heat transfer structure using composite heat pipes

Abstract

This invention relates to an enhanced heat exchange structure using composite heat pipes, comprising a heat exchange pipe and several heat pipe units. The heat pipe units are connected in series on the outside of the heat exchange pipe. Each heat pipe unit includes an annular chamber and several fins. The fins are connected to the outside of the annular chamber, which has a hollow cavity. The fins are also hollow, with the hollow portions communicating with the hollow cavity of the annular chamber. A working fluid is injected into the hollow cavity. Using this composite heat pipe enhanced heat exchange technology, heat is transferred to the annular chamber through the heat exchange pipe. The working fluid absorbs heat and undergoes a phase change to a gaseous state, diffusing from the lower side of the annular chamber to the upper half. The heat is then transferred to the fins on the lower side of the annular chamber, where the working fluid cools and returns to a liquid state before flowing to the lower half of the annular chamber. This structure also fully utilizes radial space, significantly increasing the heat exchange efficiency of the finned tube while maintaining a constant finned tube diameter.

Description

Technical Field

[0001] This utility model relates to the field of air cooler technology, specifically to an enhanced heat exchange structure using composite heat pipes. Background Technology

[0002] Finned tubes are an important component of air coolers. They increase the heat exchange area of ​​the heat exchange tubes through fins, and exchange heat with the outside air through the tube walls and fins. Heat is transferred from the heat exchange tubes to the fins, and then from the fins to the air.

[0003] Finned tubes typically use materials with good thermal conductivity, such as copper sheets, for their finned structures to achieve rapid heat transfer. A traditional finned tube structure consists of two parts: fins and heat exchange tubes, as shown in the diagram. Figure 1 As shown. However, traditional finned tubes have the following technical drawbacks:

[0004] 1. Heat transfer depends on the heat conduction between the fins and the heat exchange tube. Due to the contact thermal resistance between the two, the efficiency of heat transfer from the heat exchange tube to the fins is low.

[0005] 2. The heat exchange capacity of fins is limited by their own thermal conductivity. Even if materials with excellent thermal conductivity, such as copper, are used, their equivalent thermal conductivity is still difficult to meet the requirements of efficient heat exchange.

[0006] 3. Traditional structures do not make full use of radial space, and with a fixed heat exchange tube diameter, they cannot significantly increase the heat exchange area and heat exchange efficiency.

[0007] In existing technologies, such as the heat pipe radiator disclosed in patent document (CN102345991A), which includes a substrate, container, finned tubes, etc., in an integrated structure, the liquid working fluid is in a sealed cavity, resulting in a large heat absorption area. While this integrated structure solves the problems of traditional radiators, it is insufficient in terms of radial space utilization. The arrangement of the finned tubes limits further expansion of the heat exchange area, and since the finned tubes extend from the container, they are not suitable for scenarios requiring series installation on the outside of the heat exchange tubes. Patent document (JP02052992A) discloses a composite heat pipe structure, combining a main heat pipe and an auxiliary heat pipe to improve heat transfer performance and adapt to different orientations. Although its composite heat pipe has a main and auxiliary structure, it primarily focuses on the heat transfer of the heat pipe itself, failing to fully utilize the annular cavity and series structure to enhance the heat exchange efficiency of the finned tubes. Furthermore, the combination method between the fins and the heat pipe is not optimized.

[0008] Therefore, there is an urgent need for an enhanced heat exchange structure that can overcome the above limitations, adopt composite heat pipe enhanced heat exchange technology, and significantly improve heat exchange efficiency. Summary of the Invention

[0009] The purpose of this invention is to provide an enhanced heat exchange structure using composite heat pipes to solve the problem of low heat exchange efficiency of traditional finned tubes.

[0010] To achieve the above objectives, the technical solution of the present invention is: an enhanced heat exchange structure using composite heat pipes, comprising a heat exchange pipe and several heat pipe units, wherein the several heat pipe units are connected in series on the outside of the heat exchange pipe, each heat pipe unit comprising an annular chamber and several fins, wherein the fins are connected to the outside of the annular chamber, the annular chamber having a hollow cavity, the fins having a hollow structure, the hollow portion of the fins communicating with the hollow cavity of the annular chamber, and the hollow cavity being filled with a working fluid.

[0011] Furthermore, the inner side of the annular chamber is in contact with the outer side of the heat exchange tube, and the hollow cavity of the annular chamber is a sealed structure.

[0012] Furthermore, the fins are evenly distributed on the outer side of the annular chamber, and the fins are welded and fixed to the outer wall of the annular chamber.

[0013] Furthermore, the fins are plate-shaped, and the extending direction of the fins is perpendicular to the axial direction of the heat exchange tube.

[0014] Furthermore, the boiling point of the working fluid is lower than the temperature of the working fluid inside the heat exchange tube.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention employs composite heat pipe enhanced heat transfer technology. Heat is transferred to the annular chamber through the heat exchange tube. The working fluid absorbs heat and undergoes a phase change, transforming into a gaseous state. It then diffuses from the lower side of the annular chamber to the upper half. The heat is subsequently transferred to the fins on the lower side of the annular chamber, where the working fluid cools and returns to a liquid state before flowing to the lower half of the annular chamber. Because the evaporation and condensation heat transfer resistance inside the heat pipe is very small, the heat pipe has a very high thermal conductivity. Under the same structure, the equivalent thermal conductivity of the heat pipe is three orders of magnitude higher than that of copper fins. This structure also makes full use of the radial space, significantly increasing the heat transfer efficiency of the finned tube while keeping the finned tube diameter constant. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a traditional finned heat exchanger tube structure;

[0018] Figure 2 This is a schematic diagram of the heat exchanger structure using a composite heat pipe according to this utility model;

[0019] Figure 3 This is a cross-sectional view of the heat pipe unit structure;

[0020] Figure 4This is a three-dimensional schematic diagram of a heat pipe unit structure. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to specific embodiments.

[0022] like Figures 2 to 4 As shown, the present invention proposes an enhanced heat exchange structure with a composite heat pipe, which consists of a heat pipe unit 1 and a heat exchange tube 2. For details of its overall structure, please refer to [link to relevant documentation]. Figure 2 For details on the heat pipe unit, please refer to [link / reference]. Figure 3 As shown in Figure 4.

[0023] Several heat pipe units 1 are connected in series and installed on the outside of heat exchange tube 2. The heat pipe unit 1 consists of an annular chamber 1-1 and fins 1-2, and the working fluid 3 is injected into the inside of the annular chamber 1-1.

[0024] The inner side of the annular chamber 1-1 is in contact with the outer side of the heat exchange tube 2. The hollow cavity of the annular chamber 1-1 is a sealed structure. The fins 1-2 are evenly distributed on the outer side of the annular chamber 1-1, and the fins 1-2 are welded and fixed to the outer wall of the annular chamber 1-1.

[0025] Fins 1-2 are plate-shaped, and the extension direction of fins 1-2 is perpendicular to the axis of heat exchange tube 2. Fins 1-2 have a hollow structure, and the hollow part of fins 1-2 is connected to the hollow cavity of annular chamber 1-1.

[0026] During manufacturing, several heat pipe units are first processed, fins are welded onto the top of the heat pipe units, and working fluid is filled into the heat pipe units. The working fluid should be selected based on the temperature of the material inside the pipe, choosing a liquid with a boiling point lower than that of the working fluid. Multiple heat pipe units are then connected in series to the outside of the heat exchanger tubes, and the first and last heat pipe units are fixed to complete the installation.

[0027] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is determined by the appended claims.

Claims

1. A heat exchange enhancement structure employing a composite heat pipe, characterized in that: It includes a heat exchange tube and several heat pipe units, which are connected in series on the outside of the heat exchange tube. Each heat pipe unit includes an annular chamber and several fins. The fins are connected to the outside of the annular chamber. The annular chamber has a hollow cavity. The fins are hollow structures. The hollow parts of the fins are connected to the hollow cavity of the annular chamber. The hollow cavity is filled with working fluid.

2. The enhanced heat transfer structure using composite heat pipes according to claim 1, characterized in that: The inner side of the annular chamber is in contact with the outer side of the heat exchange tube, and the hollow cavity of the annular chamber is a sealed structure.

3. The enhanced heat transfer structure using a composite heat pipe according to claim 1, characterized in that: The fins are evenly distributed on the outer side of the annular chamber, and the fins are welded and fixed to the outer wall of the annular chamber.

4. The enhanced heat transfer structure using composite heat pipes according to claim 3, characterized in that: The fins are plate-shaped, and the direction of extension of the fins is perpendicular to the axial direction of the heat exchange tube.

5. The enhanced heat transfer structure using a composite heat pipe according to claim 1, characterized in that: The boiling point of the working fluid is lower than the temperature of the working fluid inside the heat exchange tube.

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