Curved-surface special-shaped core rod
By sintering an elliptical capillary layer into a curved mandrel on the inner wall of the heat pipe, the problem of insufficient capillary area in the heat pipe is solved, achieving a highly efficient heat dissipation effect.
Patent Information
- Application Number
- CN202520221278.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-12
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-02-12
AI Technical Summary
The existing heat pipe capillary structure has too small an area to meet the heat transfer requirements of high heat flux density electronic devices, resulting in reduced heat dissipation efficiency.
By using a curved mandrel, an elliptical capillary sintering layer is formed on the inner wall of the heat pipe to increase the capillary structure area. The curved structure of its first outer wall is used to sinter capillaries in the cavity to improve heat transfer efficiency.
By increasing the width of the capillary sintered layer, thermal resistance is effectively reduced, heat dissipation efficiency is improved, and the heat transfer requirements of high heat flux density electronic devices are met.
Smart Images
Figure CN223819653U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of stamping die technology, and in particular to a curved irregular-shaped mandrel. Background Technology
[0002] Heat pipe technology was previously widely used in aerospace, military and other industries. Since its introduction into the radiator manufacturing industry, it has changed people's traditional radiator design thinking and gotten rid of the single heat dissipation mode that simply relies on high air volume motors to obtain better heat dissipation effect.
[0003] In the heat pipe manufacturing process, a capillary structure is formed by inserting a core rod inside the heat pipe. Due to the continuous updates of high-power electronic products, the high heat flux density caused by the accelerated operation speed of electronic chips has seriously affected the working performance and stability of electronic devices. The capillary structure made by existing technology cannot meet the heat transfer requirements due to its small area, thus reducing the heat dissipation efficiency. Utility Model Content
[0004] To solve the above problems, this utility model provides a curved irregular-shaped mandrel.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: The present invention relates to a curved irregular mandrel, including a rod body, the rod body including a front end and a rear end, the front end having a gradient section, the cross-sectional area of the gradient section gradually decreasing from back to front to form a guide slope, the side surface of the rod body having a first outer wall, the first outer wall extending to the guide slope, the first outer wall being an outwardly convex curved structure.
[0006] Preferably, the rod body is made of 314 stainless steel.
[0007] Preferably, the rod body has a cylindrical structure and the diameter D of the rod body is 7.5 mm.
[0008] Preferably, the first outer wall is distributed along the length of the rod.
[0009] Preferably, the longest distance H between the first outer side wall and the other side surface of the rod is 7.1 mm.
[0010] Preferably, the length L of the gradient section is 7.5 mm, and the angle α between the extension line of the guide slope and the central axis A of the rod is 22°.
[0011] Preferably, the rear end of the rod is provided with a chamfered burr.
[0012] Preferably, the angle β between the burr chamfer and the rear end face of the rod is 0.5°.
[0013] The beneficial effects of this utility model are as follows: This utility model relates to a curved irregular-shaped mandrel. After the curved irregular-shaped mandrel is placed into the cavity of the heat pipe, sintering powder is added for sintering. Through the curved structure of the first outer side wall, an elliptical capillary sintering layer is formed inside the cavity. The first outer side wall can increase the width of the capillary sintering layer, thereby increasing the capillary structure area inside the cavity, improving heat transfer efficiency, and thus more effectively reducing thermal resistance. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of the curved irregular mandrel of this utility model.
[0015] Figure 2 This is a top view of the curved irregular mandrel of this utility model.
[0016] Figure 3 This is a right view of the curved irregular mandrel of this utility model.
[0017] Figure 4 This is a schematic diagram of the front end of the curved irregular-shaped mandrel of this utility model.
[0018] Figure 5 This is a schematic diagram of the rear end of the curved irregular-shaped mandrel of this utility model.
[0019] Figure 6 This is a schematic diagram of the structure of the present invention: a curved irregular-shaped mandrel is inserted into a heat pipe and a capillary sintered layer is formed.
[0020] Figure Labels
[0021] 1. Rod body; 11. Front end; 12. Rear end; 13. Gradient section; 2. Guide slope; 3. First outer side wall; 4. Burr chamfer; 5. Heat pipe; 6. Capillary sintered layer. Detailed Implementation
[0022] Please see Figures 1-6 As shown, this utility model relates to a curved irregular-shaped mandrel, which is a molding die for metal sintered powder. The curved irregular-shaped mandrel is inserted into the cavity of a heat pipe 5. The curved irregular-shaped mandrel has a first outer side wall 3. The curved irregular-shaped mandrel is used to extend into the heat pipe 5 so that a molding space is defined between the first outer side wall 3 and the corresponding inner side wall of the heat pipe 5. The molding space is used to fill the sintered powder (such as copper powder) and sinter it to form a capillary sintered layer 6 of the heat pipe 5. The function of the capillary sintered layer 6 is to provide a capillary structure for liquid reflux, which is the prior art. The difference between this technical solution and the prior art is that the curved irregular-shaped mandrel can increase the width of the capillary sintered layer 6.
[0023] The rod 1 includes a front end 11 and a rear end 12. The front end 11 is provided with a gradient section 13, the cross-sectional area of which gradually decreases from back to front to form a guide slope 2. The guide slope 2 increases the stability and reliability of the sintering powder filling.
[0024] The first outer side wall 3 has an outwardly convex curved structure. The first outer side wall 3 extends to the guide slope 2, which can ensure a large opening while making the front end 11 of the formed heat pipe 5 narrow and the rear end 12 wide, thereby improving the evaporation and condensation effect.
[0025] The manufacturing process of this utility model is as follows: First, a tubular heat pipe 5 is made, and a rod 1 with a predetermined shape along the long axis is made. Then, sintering powder is filled into the space formed by the notch and the inner wall of the heat pipe 5. While the sintering powder is filled and the rod 1 is inserted, the heat pipe 5 is heated at high temperature to sinter the sintering powder to form a sintered capillary sintered layer 6. Then, the rod 1 is pulled out from the heat pipe 5. After the working liquid is sealed in the heat pipe 5, vacuum treatment is performed and the port is sealed. Finally, the container is flattened.
[0026] Furthermore, the first outer sidewall 3 is distributed along the length of the rod 1.
[0027] Furthermore, the rod body 1 is made of steel, preferably 314 stainless steel, which can effectively improve the overall heat resistance, high-temperature oxidation resistance and creep resistance of the curved irregular mandrel.
[0028] Furthermore, the rod 1 has a cylindrical structure and a diameter D of 7.5 mm. The longest distance H between the first outer side wall 3 and the other side surface of the rod 1 is 7.1 mm.
[0029] Furthermore, the length L of the gradient section 13 is 7.5 mm, and the angle α between the extension line of the guide slope 2 and the central axis A of the rod body 1 is 22°.
[0030] Furthermore, the rear end 12 of the rod body 1 is provided with a burr chamfer 4, and the angle β between the burr chamfer 4 and the end face of the rear end 12 of the rod body 1 is 0.5°.
[0031] This utility model relates to a curved irregular-shaped mandrel. After the curved irregular-shaped mandrel is placed into the cavity of the heat pipe 5, sintering powder is added for sintering. An elliptical capillary sintered layer 6 is formed on the inner wall surface of the heat pipe 5 through the curved structure of the first outer side wall 3. The first outer side wall 3 can increase the width of the capillary sintered layer 6, thereby increasing the capillary structure area of the heat pipe 5, improving the heat transfer efficiency, and thus more effectively reducing the thermal resistance.
[0032] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.
Claims
1. A curved irregular-shaped mandrel, characterized in that: The device includes a rod body, which has a front end and a rear end. The front end has a transition section with a cross-sectional area that gradually decreases from back to front to form a guide slope. The side surface of the rod body has a first outer wall that extends to the guide slope. The first outer wall is a curved structure that protrudes outward.
2. The curved irregular-shaped mandrel according to claim 1, characterized in that: The rod is made of 314 stainless steel.
3. The curved irregular-shaped mandrel according to claim 1, characterized in that: The rod is cylindrical in shape and has a diameter D of 7.5 mm.
4. A curved irregular-shaped mandrel according to claim 3, characterized in that: The first outer wall is distributed along the length of the rod.
5. A curved irregular-shaped mandrel according to claim 4, characterized in that: The longest distance H between the first outer side wall and the other side surface of the rod is 7.1 mm.
6. A curved irregular-shaped mandrel according to claim 1, characterized in that: The length L of the gradient section is 7.5 mm, and the angle α between the extension line of the guide slope and the central axis A of the rod is 22°.
7. A curved irregular-shaped mandrel according to claim 1, characterized in that: The rear end of the rod is provided with a chamfered burr.
8. A curved irregular-shaped mandrel according to claim 7, characterized in that: The angle β between the chamfered burr and the rear end face of the rod is 0.5°.