A new type of heat exchange tube

Abstract

This utility model discloses a novel heat exchange tube, comprising an outer tube and an inner tube sleeved within it. The inner surface of the inner tube has several channels. Foamed metal is filled between the outer tube and the inner tube, and the foamed metal has several foam pores. An outer brazed layer is welded between the foamed metal and the outer tube, and an inner brazed layer is welded between the foamed metal and the inner tube. The channels on the inner tube surface and the built-in metal mesh work together to turbulently agitate the fluid, significantly improving the turbulent heat transfer efficiency within the tube. Simultaneously, the foamed metal seamlessly bridges the inner and outer tube walls through the inner and outer brazed layers, utilizing its porous structure to achieve high-speed heat diffusion, eliminating interfacial contact thermal resistance, and significantly improving the overall heat transfer coefficient compared to traditional heat exchange tubes.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a novel heat exchange tube. Background Technology

[0002] Heat exchange tubes are the core components inside a heat exchanger used to transfer heat. They are usually long and thin metal tubes. In a heat exchanger, one fluid flows inside the tube and another fluid flows outside the tube. Heat is transferred from the higher-temperature fluid to the lower-temperature fluid through the tube wall, thereby achieving process objectives such as heating, cooling, or condensation.

[0003] A search revealed Chinese Patent Publication No. CN209416140U, which discloses a novel heat exchange tube, comprising a tube body and a simplified section disposed in the middle of the tube body. The outer wall of the simplified section is provided with spiral blades, and the spiral blades, the outer wall of the simplified section, and the inner wall of the tube body form a spiral channel for fluid passage. The tube body has an inlet and an outlet, located at opposite ends of the spiral channel. This heat exchange tube utilizes an internal spiral channel to generate centrifugal force within the channel, improving heat exchange efficiency. Furthermore, the simplified section within the tube body reduces the cross-sectional area for fluid passage, causing fluid to concentrate at the tube wall, thus increasing fluid velocity and improving heat exchange efficiency. While this patent utilizes spiral blades to guide fluid rotation and generate centrifugal force, enhancing turbulence and significantly improving heat exchange efficiency, and further strengthens the heat exchange effect by reducing the flow cross-sectional area through the simplified section, forcing the fluid to accelerate and flow close to the tube wall, it is essentially still a two-dimensional flow channel optimization, and suffers from problems such as unresolved thermal resistance, inadequate protection, and structural fragility. Utility Model Content

[0004] The purpose of this utility model is to provide a new type of heat exchange tube. This patent achieves a technological breakthrough in efficient heat transfer, long-term stability, and wide operating condition compatibility through three-dimensional heat conduction by foam metal brazing, dual-function coating protection, and modular structure.

[0005] To achieve the above objectives, a novel heat exchange tube is provided, comprising an outer tube, an inner tube being sleeved inside the outer tube, and a plurality of grooves being formed on the inner surface of the inner tube;

[0006] The space between the outer tube and the inner tube is filled with foam metal, and the foam metal has a plurality of foam holes. An outer wall brazing layer is welded between the foam metal and the outer tube, and an inner wall brazing layer is welded between the foam metal and the inner tube.

[0007] According to the novel heat exchange tube, a metal mesh is fixedly connected inside the inner tube.

[0008] According to the novel heat exchange tube, carbon steel fins are fixedly connected to the outer wall of the outer tube.

[0009] According to the novel heat exchange tube, a connecting pipe is fixedly connected to one end of the outer tube, and another outer tube is fixedly connected to the other end of the connecting pipe. Several bolts are threaded onto the connecting pipe.

[0010] According to the novel heat exchange tube, the carbon steel fins are coated with a superhydrophobic nano-carbon ceramic coating.

[0011] According to the novel heat exchange tube, the inner surface of the inner tube is coated with a diamond-like carbon-based composite coating.

[0012] The above-mentioned solution has the following beneficial effects:

[0013] 1. This patent significantly improves the turbulent heat transfer efficiency inside the tube by using the grooves on the inner tube surface and the built-in metal mesh to turbulently disturb the fluid. At the same time, the foam metal is seamlessly bridged between the inner and outer tube walls by the brazing layers on the inner and outer walls. Its porous structure enables high-speed heat diffusion, eliminates interfacial contact thermal resistance, and significantly improves the overall heat transfer coefficient compared with traditional heat exchange tubes.

[0014] 2. This patent effectively inhibits scaling and frosting through the superhydrophobic nano-carbon ceramic coating on the carbon steel fins, ensuring the stability of heat exchange outside the tube; the diamond-like carbon-based composite coating on the inner tube reduces flow resistance and resists corrosion and wear, extending service life. In addition, the segmented design of the outer tube allows for disassembly and assembly via connecting pipes and bolts, supporting modular expansion and rapid maintenance, significantly reducing installation and maintenance costs.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0017] Figure 1 This is a front view of a novel heat exchange tube according to the present invention;

[0018] Figure 2 This is an overall schematic diagram of a novel heat exchange tube according to the present invention;

[0019] Figure 3 A is a partially enlarged cross-sectional view of the connection point of a novel heat exchanger tube according to this utility model;

[0020] Figure 4 This is a top view of a novel heat exchange tube according to this utility model.

[0021] Legend:

[0022] 1. Foam metal; 2. Outer wall brazed layer; 3. Foam pores; 4. Inner wall brazed layer; 5. Connecting pipe; 6. Bolt; 7. Metal mesh; 8. Channel; 9. Inner tube; 10. Carbon steel fins; 11. Outer tube two; 12. Outer tube one. Detailed Implementation

[0023] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0024] Reference Figure 1-4 This utility model embodiment provides a novel heat exchange tube, which includes an outer tube 12, an inner tube 9 is sleeved inside the outer tube 12, and a plurality of grooves 8 are formed on the inner surface of the inner tube 9.

[0025] Foam metal 1 is filled between the outer tube 12 and the inner tube 9. Foam metal 1 has several foam holes 3. An outer wall brazing layer 2 is welded between foam metal 1 and outer tube 12, and an inner wall brazing layer 4 is welded between foam metal 1 and inner tube 9. The foam metal 1 filled between outer tube 12 and inner tube 9 has a microchannel network formed by the through foam holes 3. When heat is transferred from inner tube 9 to the outside, foam metal 1 achieves heat diffusion through a highly thermally conductive substrate, and the microchannel further enhances heat exchange. The outer wall brazing layer 2 and the inner wall brazing layer 4 make foam metal 1 form a metallurgical bond with the tube wall, completely eliminating gap thermal resistance and improving heat conduction efficiency.

[0026] A metal mesh 7 is fixedly connected inside the inner tube 9. The metal mesh 7 is fixed to the inner wall of the inner tube 9 in a spiral structure. When the fluid flows through it, it divides the fluid and generates a secondary eddy, which disrupts the thickening trend of the thermal boundary layer and improves the local heat transfer coefficient inside the tube. At the same time, the metal mesh 7 supports the inner tube 9 to resist the impact of fluid pulsation and prevents structural deformation.

[0027] Carbon steel fins 10 are fixedly connected to the outer wall of the outer tube 12. The carbon steel fins 10 are welded to the outer wall of the outer tube 12 in a circumferential array. By expanding the surface area, the heat exchange area on the gas side outside the tube is increased. The gap between the fins forms a forced convection channel, which significantly reduces the thermal resistance on the gas side.

[0028] The outer tube 12 is fixedly connected to a connecting tube 5 at one end, and the other end of the connecting tube 5 is fixedly connected to an outer tube 2 11. Several bolts 6 are threaded onto the connecting tube 5. The two ends of the connecting tube 5 are inserted into the outer tube 12 and the outer tube 2 11. The radial clamping force is applied by the bolts 6 to achieve a sealed connection. This split structure allows for independent replacement of individual heat exchange tubes, avoiding overall scrapping and reducing maintenance costs.

[0029] The carbon steel fin 10 is coated with a superhydrophobic nano-carbon ceramic coating. The superhydrophobic nano-carbon ceramic coating forms a micro-nano composite structure on the surface of the carbon steel fin 10, which allows condensate droplets to roll off quickly. In dusty or high-humidity environments, it can reduce dirt deposition and maintain stable heat exchange performance of the fin.

[0030] The inner surface of the inner tube 9 is coated with a diamond-like carbon-based composite coating. The dense film layer formed by the diamond-like carbon-based composite coating on the inner surface of the inner tube 9 significantly reduces the coefficient of friction, thereby reducing fluid transport energy consumption. In acidic or high-salt media, its corrosion resistance is several times higher than that of stainless steel, thus extending its service life.

[0031] Working principle: During use, the operator connects the outer tube 12 to the outer tube 21 via the connecting pipe 5 and bolt 6. When the hot fluid flows through the inner tube 9, the channels 8 on its inner surface disrupt the laminar boundary layer of the fluid, enhancing heat transfer within the tube through turbulence. Simultaneously, the metal mesh 7 inside the inner tube 9 further agitates the fluid. When the cold fluid flows through the outside of the outer tube 12, the carbon steel fins 10 expand the heat transfer area. Heat is transferred to the foam metal 1 through the brazed layer 4 on the inner wall and then conducted to the outer tube 12 via the brazed layer 2 on the outer wall. The diamond-like carbon composite coating of the inner tube 9 reduces... The superhydrophobic nano-carbon ceramic coating on the carbon steel fins 10 reduces flow resistance and corrosion, inhibiting scaling and frost formation. The overall flow is facilitated by the grooves 8 on the surface of the inner tube 9 and the built-in metal mesh 7, significantly improving the turbulent heat transfer efficiency inside the tube. Meanwhile, the foam metal 1 is seamlessly connected to the inner and outer tube walls by brazing layers, utilizing its porous structure to achieve high-speed heat diffusion, completely eliminating interfacial contact thermal resistance and improving the overall heat transfer coefficient. The segmented design of the outer tube allows for disassembly and assembly via connecting pipes 5 and bolts 6, supporting modular expansion and rapid maintenance, and significantly reducing installation and maintenance costs.

[0032] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A novel heat exchange tube, comprising: The outer tube (12) is characterized in that an inner tube (9) is provided inside the outer tube (12), and a plurality of grooves (8) are provided on the inner surface of the inner tube (9). The space between the outer tube (12) and the inner tube (9) is filled with foam metal (1), and the foam metal (1) has several foam holes (3). An outer wall brazing layer (2) is welded between the foam metal (1) and the outer tube (12), and an inner wall brazing layer (4) is welded between the foam metal (1) and the inner tube (9).

2. The novel heat exchange tube according to claim 1, characterized in that, A metal mesh (7) is fixedly connected inside the inner tube (9).

3. The novel heat exchange tube according to claim 1, characterized in that, Carbon steel fins (10) are fixedly connected to the outer wall of the outer tube (12).

4. The novel heat exchange tube according to claim 1, characterized in that, The outer tube (12) is fixedly connected to a connecting tube (5) at one end, and the connecting tube (5) is fixedly connected to an outer tube (11) at the other end. Several bolts (6) are threaded onto the connecting tube (5).

5. A novel heat exchange tube according to claim 3, characterized in that, The carbon steel fins (10) are coated with a superhydrophobic nano-carbon ceramic coating.

6. A novel heat exchange tube according to claim 1, characterized in that, The inner surface of the inner tube (9) is coated with a diamond-like carbon-based composite coating.

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