Heat pipe and heat dissipation system thereof

Abstract

The application provides a heat pipe and a heat dissipation system thereof, and the heat pipe comprises an inner pipe and an outer pipe, the inner pipe is arranged inside the outer pipe, a gap is arranged between the inner pipe and the outer pipe, the outer pipe comprises a first end and a second end, the first end of the inner pipe is connected to the inner wall of the outer pipe through a connecting wall and extends from the first end of the outer pipe to the second end to form the second end of the inner pipe, a gap is arranged between the second end of the inner pipe and the second end of the outer pipe, the first end of the inner pipe is arranged at a distance from the first end of the outer pipe, the first end of the inner pipe and the first end of the outer pipe form an evaporation part of the heat pipe, a steam injection hole is arranged on the inner pipe and used for injecting steam generated at the evaporation end to the inner wall of the outer pipe, and the outer wall of the outer pipe is used for heat dissipation. The application can impact the laminar bottom layer of heat exchange by arranging the inner pipe and the outer pipe and injecting steam through the steam injection hole of the inner pipe, the steam convection heat exchange is strengthened, and the heat dissipation effect of the heat pipe is improved.

Description

Technical Field

[0001] This invention belongs to the field of heat exchangers, and particularly relates to a heat pipe and its heat dissipation system. Background Technology Heat pipe technology is a heat transfer element called a "heat pipe" invented by George Grover at Los Alamos National Laboratory in the United States in 1963. It makes full use of the principle of heat conduction and the rapid heat transfer properties of phase change media to quickly transfer the heat of the heated object to the outside of the heat source. Its thermal conductivity exceeds that of any known metal.

[0002] Of the three modes of heat transfer (radiation, convection, and conduction), convection is the fastest. A heat pipe utilizes the phase change process of a medium evaporating at the hot end and condensing at the cold end (i.e., utilizing the latent heat of vaporization and condensation of the liquid) to rapidly conduct heat. A typical heat pipe consists of a shell, a wick, and end caps. The inside of the heat pipe is evacuated to a negative pressure state and filled with a suitable liquid with a low boiling point and high volatility. The pipe wall has a wick made of a capillary porous material. One end of the heat pipe is the evaporation end, and the other end is the condensation end. When one end of the heat pipe is heated, the liquid in the capillary rapidly vaporizes. The vapor flows to the other end under the force of thermal diffusion and condenses at the cold end, releasing heat. The liquid then flows back to the evaporation end along the porous material by capillary action. This cycle continues until the temperatures at both ends of the heat pipe are equal (at which point vapor thermal diffusion stops). This cycle is rapid, and heat can be continuously conducted.

[0003] Since its introduction into the radiator manufacturing industry, heat pipes have changed the traditional design thinking of radiators, breaking away from the single heat dissipation mode that relies solely on high-airflow motors to achieve better heat dissipation. The use of heat pipe technology allows radiators to achieve satisfactory results even when using low-speed, low-airflow motors, effectively solving the noise problem that plagues air-cooled heat dissipation and opening up a new world for the heat dissipation industry.

[0004] In the prior art, CN102141351A discloses a heat pipe having an inner tube with one end closed and the other open, and an outer tube with one end closed and the other open. The open end of the inner tube is inserted along the axis from the open end of the outer tube and extends to near the closed end of the outer tube. A sealing ring is disposed at the open end of the outer tube, sealing the annular opening between the outer tube and the inner tube. Several return tubes made of insulating material are evenly threaded through the sealing ring, each return tube extending to near the closed end of the inner tube and communicating with the inner tube. The outer tube is the condensation section of the heat pipe, and the portion of the inner tube outside the outer tube is the evaporation section of the heat pipe. In the heat pipe of the present invention, the vapor flow and liquid flow do not interfere with each other, resulting in high heat transfer efficiency.

[0005] CN103884218A discloses an eccentric radial heat exchange tube, including an inner tube, an outer tube, and end caps at both ends. The inner tube is positioned eccentrically upward relative to the outer tube, so that the working fluid cavity between the horizontally placed inner and outer tubes forms a pattern that is smaller at the top and larger at the bottom. The thickness h of the end cap is 30-50 mm. A protective sleeve is provided on the end cap at the connection point between the heat exchange tube and the corresponding tube sheet. The two ends of the protective sleeve are respectively connected to the end cap and the outer tube.

[0006] In existing technologies, heat pipes all have steam exiting from a single outlet, and the steam outlets are relatively concentrated with slow flow rates, resulting in poor heat exchange performance.

[0007] To address the aforementioned problems, this invention improves the heat exchanger by incorporating an inner tube and an outer tube, and by injecting steam through the steam injection holes in the inner tube. This impinges on the laminar sublayer of the heat exchanger, enhancing steam convection heat transfer and improving the heat dissipation effect of the heat pipe. Summary of the Invention

[0008] This invention provides a novel heat pipe structure and its heat dissipation system, thereby solving the aforementioned technical problems.

[0009] To achieve the above objectives, the technical solution of the present invention is as follows: A heat pipe includes an inner tube and an outer tube. The inner tube is disposed inside the outer tube, and a gap is provided between the inner tube and the outer tube. The outer tube includes a first end and a second end. The first end of the inner tube is connected to the inner wall of the outer tube through a connecting wall and extends from the first end of the outer tube towards the second end to form the second end of the inner tube. A gap is provided between the second end of the inner tube and the second end of the outer tube. A distance is provided between the first end of the inner tube and the first end of the outer tube. The first end of the outer tube is connected to a heat source. An evaporation section of the heat pipe is formed between the first end of the inner tube and the first end of the outer tube. A steam nozzle is provided on the inner tube for spraying steam generated in the evaporation section onto the inner wall of the outer tube, and dissipating heat outward through the inner wall of the outer tube.

[0010] As an improvement, the inner tube and the outer tube are arranged as concentric circles or concentric rectangles.

[0011] As an improvement, the connecting wall between the inner and outer tubes is parallel to the first end of the outer tube.

[0012] As an improvement, a through hole is provided in the connecting wall to allow condensate to flow into the evaporation section.

[0013] As an improvement, the distribution density of steam nozzles increases from the first end to the second end of the inner tube.

[0014] As an improvement, the distribution density of steam nozzles increases progressively from the first end to the second end of the inner tube.

[0015] As an improvement, fins are provided on the outer wall of the outer tube.

[0016] A heat dissipation system includes a heat source and a heat pipe for dissipating heat from a heat pipe to the outside, the heat pipe being the aforementioned heat pipe.

[0017] As an improvement, there are multiple heat pipes, and the evaporation section of the heat pipe is thermally connected to a heat source.

[0018] As an improvement, a heat-conducting fixing component is provided between the heat pipes, and the heat pipe evaporation section is inserted into the heat-conducting fixing component, which is then fixed to the heat source.

[0019] Compared with the prior art, the present invention has the following advantages: This invention improves the heat pipe's heat dissipation effect by setting up an inner and outer pipe and injecting steam through the steam injection holes of the inner pipe at multiple locations, thereby increasing the steam outlet velocity and impacting the laminar sublayer inside the outer pipe. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the heat pipe structure of the present invention; Figure 2 This is a schematic diagram of the heat dissipation system structure of the present invention; Figure 3 This is a schematic diagram of the heat pipe connection structure of the heat dissipation system of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the heat pipe of the present invention. Detailed Implementation

[0021] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Figure 1-4 A heat pipe and its heat dissipation system are disclosed. For example... Figure 1 As shown, a heat pipe 8 includes an inner pipe 1 and an outer pipe 2. The inner pipe 1 is disposed inside the outer pipe 2, and a gap 3 is provided between the inner pipe 1 and the outer pipe 2. The outer pipe includes a first end 21 and a second end 22, and the inner pipe includes a first end 11 and a second end 12. The first end 11 of the inner pipe is connected to the inner wall of the outer pipe 2 through a connecting wall 4, and extends from the first end 21 of the outer pipe to the second end 22 to form the second end 12 of the inner pipe. A gap 5 is provided between the second end of the inner pipe and the second end of the outer pipe. A distance is provided between the first end of the inner pipe and the first end of the outer pipe. The first end of the outer pipe is connected to a heat source 6. An evaporation section 10 of the heat pipe is formed between the first end of the inner pipe and the first end of the outer pipe. A steam nozzle 13 is provided on the inner pipe for spraying the steam generated at the evaporation end onto the inner wall of the outer pipe, and dissipating heat outward through the inner wall of the outer pipe.

[0022] This invention improves the heat pipe's heat dissipation effect by setting up an inner and outer pipe and injecting steam through the steam injection holes of the inner pipe at multiple locations, thereby increasing the steam outlet velocity and impacting the laminar sublayer inside the outer pipe.

[0023] As an improvement, the inner tube 1 and the outer tube 2 have circular or rectangular cross-sections, preferably concentric circles or concentric rectangles. As an improvement, the rectangle is a square.

[0024] As an improvement, the connecting wall 4 between the inner and outer pipes is parallel to the first end of the outer pipe. This arrangement ensures that steam enters the inner pipe through the middle position, guaranteeing uniform steam distribution.

[0025] As an improvement, a through hole 9 is provided in the connecting wall to allow the condensate formed after steam condensation to flow into the evaporation section. This design ensures rapid fluid return.

[0026] As an improvement, the distribution density of steam nozzles increases from the first end to the second end of the inner tube. This is because both the first and second ends have cold sources, such as cold air, but the heat exchange gradually increases from the first to the second end. For example, when using air cooling, the second end, with its partially open structure, experiences the highest wind speed, largest air volume, and greatest heat exchange. By varying the distribution density of the steam nozzles, the area of ​​the nozzles gradually increases, ensuring that more steam can be distributed and ejected from the top, guaranteeing the steam ejection speed and heat exchange at the second end, thereby improving overall heat exchange efficiency. Furthermore, the area traversed by the steam for heat exchange is also the largest as it flows from the second end to the first. However, since the first end also has a cold source, it also needs to have openings for heat exchange.

[0027] As an improvement, the distribution density of steam nozzles increases progressively from the first end to the second end of the inner tube. This configuration further enhances heat exchange efficiency.

[0028] As an improvement, the gap between the inner and outer tubes gradually decreases from the first end to the second end of the inner tube. Specifically, the gap at the first end of the inner tube is smaller than that at the second end. Figure 1 As shown, there are cold sources, such as cold air, at both the top and bottom. However, the heat exchange gradually increases from bottom to top. For example, when using air cooling, the wind speed and volume are the highest at the top, resulting in the greatest heat exchange. By setting varying gaps, the steam ejected from the steam nozzles impacts the inner wall of the outer pipe more forcefully, ensuring the steam ejection speed and heat exchange at the top, thereby improving the overall heat exchange efficiency.

[0029] As an improvement, the gap between the inner and outer tubes gradually narrows from the first end to the second end of the inner tube. This design further enhances heat exchange efficiency.

[0030] As an improvement, such as Figure 3 As shown, fins 7 are provided on the outer wall of the outer tube. Preferably, the fins extend in a direction parallel to the heat source, or perpendicular to the axis of the heat pipe. By providing fins, and ensuring that the fins extend in a direction parallel to the flow direction of the cold source, heat exchange can be promoted and the flow resistance of the cold source can be reduced.

[0031] A heat dissipation system, such as Figure 2-3 As shown, the system includes a heat source 6 and a heat pipe 8 that dissipates heat from the heat source to the outside. The heat pipe 8 is the one mentioned earlier. Figure 1 The aforementioned heat pipe.

[0032] As an improvement, such as Figure 2 As shown, there are multiple heat pipes 8, and the evaporation section of the heat pipe is thermally connected to the heat source.

[0033] As an improvement, such as Figure 3 As shown, a thermally conductive fixing component 9 is provided between the heat pipes. The evaporation section of the heat pipe is inserted into the thermally conductive fixing component, which is then fixed to the heat source. As an improvement, the heat source is a new energy vehicle battery. As an improvement, the thermally conductive component has an opening, into which the evaporation section of the heat pipe is inserted. By providing the thermally conductive component, the heat pipe can be fixed, ensuring convenient installation. Furthermore, the heat exchange area can be expanded through the thermally conductive component, enabling external heat dissipation from the heat source.

[0034] As an improvement, the cross-section of the heat pipe is as follows: Figure 4 As shown. The inner tube 1 includes multiple straight walls 14, which are connected to form a pentagonal structure. The five outer vertices of the pentagon abut against the inner wall of the outer tube, and steam nozzles are provided on the straight walls.

[0035] The heat pipe of the present invention increases the area for steam to be ejected outward by improving the inner tube into a pentagonal structure. Moreover, due to the straight wall extending inward, the fluid in the inner tube flows more from the center of the tube to the apex of the tube, thereby increasing the pressure at the corners. Compared with other shapes, it reduces the flow dead zone and avoids uneven spraying caused by uneven fluid distribution at different locations, thus making the overall sprayed fluid uniform.

[0036] This application improves the inner tube into a pentagonal structure, increasing the fluid flow area, thereby making the steam injection more uniform and the heat exchange effect better.

[0037] As an improvement, the extension line of the jet direction of the jet orifice passes through the center of the inner tube. This arrangement further enhances the uniformity of the jet fluid distribution.

[0038] As an improvement, the density of the injection holes increases from the inner corner to the outer corner of the pentagon on a single straight wall. This is because the study found that the fluid jet volume is the largest in the middle. By adjusting the density of the injection holes, the overall jetting can be made more uniform, thus improving the mixing and heat transfer efficiency.

[0039] Preferably, on a single straight wall, the distribution density of the injection holes increases progressively from the inner corner to the outer corner of the pentagon. This arrangement further optimizes the overall heat exchange effect and improves the mixing heat exchange efficiency.

[0040] While the present invention has been disclosed above with reference to preferred embodiments, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A heat pipe, comprising an inner tube and an outer tube, the inner tube being disposed inside the outer tube, a gap being provided between the inner tube and the outer tube, the outer tube comprising a first end and a second end, the first end of the inner tube being connected to the inner wall of the outer tube via a connecting wall, and extending from the first end of the outer tube toward the second end to form the second end of the inner tube, a gap being provided between the second end of the inner tube and the second end of the outer tube, a distance being provided between the first end of the inner tube and the first end of the outer tube, the first end of the outer tube being connected to a heat source, an evaporation section of the heat pipe being formed between the first end of the inner tube and the first end of the outer tube, and a steam nozzle being provided on the inner tube for injecting steam generated in the evaporation section onto the inner wall of the outer tube, thereby dissipating heat outward through the inner wall of the outer tube.

2. The heat pipe as described in claim 1, characterized in that, The inner and outer tubes are arranged in concentric circles or concentric rectangles.

3. The heat pipe as described in claim 1, characterized in that, The connecting wall of the inner and outer tubes is parallel to the first end of the outer tube.

4. The heat pipe as described in claim 1, characterized in that, The connecting wall is provided with through holes to allow condensate to flow into the evaporation section.

5. The heat pipe as described in claim 1, characterized in that, From the first end to the second end of the inner tube, the distribution density of steam nozzles increases.

6. The heat pipe as described in claim 5, characterized in that, From the first end to the second end of the inner tube, the distribution density of the steam nozzles increases progressively.

7. The heat pipe as claimed in claim 1, characterized in that, The outer wall of the outer tube is provided with fins.

8. A heat dissipation system, the system comprising a heat source and a heat pipe for dissipating heat from a heat pipe to the outside, the heat pipe being the heat pipe as described in any one of claims 1-7.

9. The heat dissipation system as described in claim 8, characterized in that, The heat pipes are multiple, and the evaporator section of the heat pipe is thermally connected to the heat source.

10. The heat dissipation system as described in claim 9, characterized in that, A heat-conducting fixing component is provided between the heat pipes, and the heat pipe evaporation section is inserted into the heat-conducting fixing component, which is fixed to the heat source.

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