CN2679628Y - Heat pipe with improved capillary structure - Google Patents

Abstract

A heat pipe with improved capillary structure is composed of a pipe body and a capillary structure. The tube body is made of metal material with good heat conductivity, and the capillary tissue is composed of mesh and particles. The net is attached to the inner wall of the tube in a ring shape, the particles are embedded between the net and the pores of the inner wall, and the capillary tissue is adhered to the inner wall of the tube in a sintering mode to form a capillary conduction tissue with a dense structure. Therefore, the phenomenon of stripping or breaking of the capillary structure in the machining process of the heat pipe can be avoided, and the core rod arranged in the sintering process can be omitted, so that the manufacturing process is simplified, and the manufacturing cost is reduced.

Description

Heat pipe with improved capillary structure

technical field

The utility model relates to a heat pipe, in particular to a heat pipe with improved capillary structure which can avoid peeling or breaking of the capillary structure in the process of mechanical processing of the heat pipe, and can effectively improve capillary suction and heat conduction capacity.

Background technique

Today's computers have powerful computing functions and fast running speeds, and their shape and structure are developing in the direction of "light, thin, short, and small". The temperature generated when executing calculation instructions is higher, so how to use a good heat conduction and heat dissipation system to make the central processing unit operate normally at a permissible operating temperature has become an important research topic for those skilled in the art. Among them, the heat pipe radiator combined with a heat pipe and a heat dissipation unit is widely and widely used. The heat pipe radiator uses the liquid-vapor phase change of the working fluid in the heat pipe body to generate heat conduction and the capillary suction of the capillary inside the pipe body, and quickly guides the condensed working fluid back to flow. Thus, a high-efficiency radiator with repeated cycles of heat absorption and heat dissipation is formed.

1 and 2 are schematic diagrams of capillary structures of conventional heat pipes, respectively. As shown in Figures 1 and 2, the heat pipe is a screen-type heat pipe (as shown in Figure 1) composed of a pipe body 10a and a screen cloth 20a, and a sintered heat pipe composed of a pipe body 10a and a sintered object 30a (such as As shown in FIG. 2 ), the capillary formed by the screen 20a or the sintered object 30a is used as a transmission mechanism for liquid drainage. Wherein, the screen-type heat pipe uses a screen 20a to wrap a mandrel (not shown in the figure) and put it into the inside of the pipe body 10a, and then pulls out the mandrel so that the screen 20a can be set around And attached to the inner wall surface of the pipe body 10a to form a screen-type heat pipe. In this sintered heat pipe, a mandrel 31a is first placed in the center of the tube body 10a, and then the powdery sintered material 30a is poured into the tube body 10a for sintering. After the sintering is completed, it is cooled, and the core The rod 31a is pulled out from the tube body 10a to form a sintered heat pipe. When the heat pipe is used in practice, it must be made into various shapes (such as: L-shaped, U-shaped) or forms (such as: flattened tubes or high-low-level difference tubes) according to various radiators or heat sources. The mechanical processing enables the heat pipe to be in contact with heat dissipation fins or heat sources.

However, the above known heat pipes with improved capillary structure have the following defects in the manufacturing process or mechanical processing:

1. The structure of the pipe body 10a of the screen-type heat pipe is different from that of the copper mesh 20a. When the heat pipe is bent and formed, the outer fillet of the copper mesh 20a will be stretched to reduce the tissue density, or the copper mesh will be stretched. The mesh 20a is separated from the inner wall surface of the pipe body 10a, so that the capillary conduction suction of the copper mesh 20a there is reduced.

2. When the sintered heat pipe is mechanically processed, the structure of the sintered object 30a will be structurally fractured at the bend. During the sintering process of the heat pipe, a mandrel 31a must be inserted into the tube body 10a or pulled out from the tube body 10a. When the core rod 31a is pulled out from the inside of the tube body 10a, it is often taken out together with the sintered material 30a, and the tube body 10a has been annealed and softened through the heating process in the manufacturing process, and it is very easy to be affected by the force when the core rod 31a is pulled out. As a result, the pipe body 10a is deformed irregularly.

3. During the melting or condensation process of the sintered product 30a of the sintered heat pipe, since the mandrel 31a is not easy to be centered, the formed sintered product 30a has an eccentric phenomenon of uneven thickness.

4. When a large-diameter heat pipe is manufactured by sintering, the volume and quality of the mandrel 31a must be relatively increased, and the heating and cooling in the manufacturing process require a long working time, which affects the improved capillary structure. Heat pipes have more variables.

In view of the defects in the above-mentioned prior art, with many years of experience in this industry, and aiming at the inconvenience and defects that can be improved, after painstaking research and practical application, in the spirit of excellence, I finally proposed a design The utility model that improves above-mentioned defects reasonably and effectively.

Contents of the utility model

The main purpose of the utility model is to provide a heat pipe with an improved capillary structure, the heat pipe is provided with a composite capillary structure, which can avoid the capillary stripping or breaking of the heat pipe during mechanical processing, and effectively improve the heat pipe's performance. Capillary suction and heat transfer capability, and can omit the mandrel provided in the sintering manufacturing process, so that the manufacturing process becomes simple and the manufacturing cost is reduced.

In order to achieve the above object, the utility model provides a heat pipe with improved capillary structure, which includes a pipe body and a capillary structure, wherein the pipe body is made of a metal material with good thermal conductivity, and the capillary structure is made of a mesh and particulate matter. The mesh is attached to the inner wall of the tube in a ring shape, the particles are embedded between the mesh and the holes on the inner wall, and the capillary is adhered to the inner wall of the tube by sintering to form a structure Dense capillary conduction tissue to achieve the above purpose.

The heat pipe with improved capillary structure of the utility model can avoid capillary stripping or fracture of the heat pipe during mechanical processing, omits the mandrel set in the sintering process, simplifies the manufacturing process, and reduces the manufacturing cost .

Brief description of the drawings

Fig. 1 is the schematic diagram of known heat pipe structure;

2 is a schematic diagram of another known heat pipe structure;

3 is a cross-sectional view of a heat pipe with improved capillary structure according to an embodiment of the present invention;

Fig. 4 is a partially enlarged view of part A in Fig. 3;

FIG. 5 is a cross-sectional view of a heat pipe with improved capillary structure according to another embodiment of the present invention.

In the accompanying drawings, the list of parts represented by each label is as follows:

10a-tube body

20a-screen

30a - sinter

31a- mandrel

10-tube body

11-open end

13-Inner wall 14-Support

20 - Capillary

21-Mesh 22-Particles

Detailed ways

In order for those skilled in the art to further understand the features and technical contents of the present utility model, please refer to the following detailed description and accompanying drawings of the present utility model. The accompanying drawings are provided for reference and illustration only, and are not intended to limit the present utility model.

Fig. 3 is a sectional view of the heat pipe of the present invention, and Fig. 4 is a partially enlarged view of part A in Fig. 3 . The utility model provides a heat pipe with improved capillary structure, as shown in Figure 3 and Figure 4, comprising a pipe body 10 and a capillary structure 20, wherein:

The tube body 10 is made of a material with good thermal conductivity (such as: pure copper), and its shape can be circular, elliptical or other geometric shapes, and in this embodiment it is a circular tube. Two ends of the tube body 10 are respectively formed with an open end 11 and a closed end 12 , and the inside of the tube body 10 has an inner wall surface 13 .

The melting point of the capillary structure 20 may be lower than that of the pipe body 10, which is beneficial to the sintering process. The capillary structure 20 is composed of mesh 21 and particles 22 . The mesh 21 can be a woven net, a thin plate with a plurality of holes, or a thin plate with a plurality of holes and a plurality of concave and convex points formed on the surface, and is a woven net in this embodiment. The net 21 is in the shape of a ring, and the circumference of the ring formed by it is slightly larger than the inner circumference of the tube 10 , so that the net 21 can be closely attached to the inner wall 13 of the tube 10 . The front end of the mesh 21 can extend to the bottom surface of the closed end 12 of the tube body 10, so that the heat pipe has better heat conduction performance. Particles 22 are metal powder or cut fine fibers, in the present embodiment it is a metal powder, and its external dimension is smaller than the hole or gap size of mesh 21, which is beneficial for particle 22 to be embedded in the holes or gaps of mesh 21 . The melting point of the particles 22 can be lower than the melting point of the mesh 21 , which is beneficial to the mutual combination of the particles 22 during the sintering process to form a dense capillary conductive structure.

When combining, first put the mesh 21 from the open end 11 of the tube body 10, and make it tightly attached to the inner wall surface 13 of the tube body 10, then pour the particles 22 into the inside of the tube body 10, shake it evenly and Rotate the tube body 10 so that the particles 22 are embedded in the holes and gaps between the mesh 21 and the inner wall surface of the tube body 10, and then the particles 22, the mesh 21 and the inner wall surface 13 of the tube body are mutually connected by sintering. Adhesive bonding.

Fig. 5 is a cross-sectional view of another embodiment of the heat pipe of the present invention. After the capillary tissue 20 is placed into the tube body 10 and combined, a support body 14 is further provided inside the tube body 10. The melting point of the support body 14 is higher than the melting point of the mesh 21 and the particles 22, and can be a linear helix or a plate. The spiral body or the plate body with multiple holes is curled into the shape of a roll. In this embodiment, it is a linear spiral body. Through its own elastic force, the mesh 21 and the particles 22 are pressed against and positioned on the tube body 10. In the process of sintering, the mesh 21 is less likely to shrink and curl, so that the capillary tissue 20 is more closely attached to the inner wall surface 13 of the tube body 10 .

As mentioned above, the heat pipe with improved capillary structure of the present invention has the following advantages:

1. Through the arrangement of the composite capillary structure of the present invention, it is possible to avoid the loss of heat conduction performance due to capillary stripping or fracture during mechanical processing of the screen heat pipe or sintered heat pipe.

2. Since the pipe body is combined with the mesh and particles by sintering, a capillary structure of a composite material can be obtained, and the setting and design of the capillary structure have more choices and less restrictions.

3. During the manufacturing process of the heat pipe of the present invention, the trouble of inserting or pulling out the mandrel in the sintering process can be avoided, the manufacturing cost can be greatly reduced, and a capillary structure with stable quality, uniform structure and no eccentricity can be obtained.

In summary, the heat pipe with improved capillary structure of the present utility model has practicality, novelty and creativity, and the structure of the utility model has never been seen in similar products and has been publicly used, and has not been published in any publications before the application , in full compliance with the requirements for utility model patent applications.

The above is only an embodiment of the utility model, and does not limit the patent scope of the utility model. Any equivalent structural transformation made by using the utility model specification and accompanying drawings, or directly or indirectly used in other related technologies Fields are equally included in the patent scope covered by the utility model.

Claims (10)

1. A heat pipe with improved capillary structure, comprising a tube body and a capillary structure, the tube body is made of a metal material with good thermal conductivity, it is characterized in that the capillary structure is made of mesh and particles, The mesh is attached to the inner wall surface of the tube body in a ring shape, the particles are embedded between the mesh and the holes on the inner wall surface, and the capillary tissue is adhered to the surface by sintering. on the inner wall of the tube. 2 . The heat pipe with improved capillary structure according to claim 1 , wherein the pipe body has an open end and a closed end, and the mesh extends to the bottom surface of the closed end. 3. The heat pipe with improved capillary structure according to claim 1, characterized in that the melting point of the tube body is higher than the melting point of the capillary structure. 4. The heat pipe with improved capillary structure according to claim 1, characterized in that the mesh is a woven mesh or made of a thin plate with a plurality of holes. 5 . The heat pipe with improved capillary structure according to claim 4 , characterized in that a plurality of concave and convex points are formed on the surface of the thin plate, which facilitates the fitting connection of the particles. 6 . 6. The heat pipe with improved capillary structure as claimed in claim 1, characterized in that the melting point of the particles is lower than the melting point of the mesh. 7. The heat pipe with improved capillary structure as claimed in claim 1, characterized in that said particles are metal powder or chopped fine fibers. 8. The heat pipe with improved capillary structure according to claim 1, characterized in that a support body is further provided, the support body is arranged in the tube body, and is used to press the capillary tissue against the inner wall surface of the tube body. 9. The heat pipe with improved capillary structure according to claim 8, characterized in that the melting point of the support is higher than the melting point of the mesh and particles. 10. The heat pipe with improved capillary structure according to claim 8, characterized in that the support body is a plate-shaped helix, a linear helix, or a plate with multiple holes rolled into a roll shape.

Images