Heat-conducting and insulating supporting seat made of multi-layer composite material

Abstract

The utility model relates to a multilayer composite material heat conduction and insulation supporting seat, which comprises a red copper binding post, an insulation protection shell, an aluminum nitride ceramic chip, a flexible graphite heat conduction pad, an unthreaded hole bushing, a hexagonal head bolt elastic flat washer assembly and a steel wire thread insert, a steel wire thread insert is arranged in the red copper binding post; a disc-shaped groove is formed in the bottom of the column, and a corresponding disc-shaped boss is arranged outside the column; the insulating protective shell is arranged outside the red copper binding post; a pair of mounting lugs is arranged at the two ends of the lower part outside the shell, unthreaded hole bushes are embedded in the mounting lugs, and hexagonal head bolt and elastic flat washer assemblies are arranged in the mounting lugs; the aluminum nitride ceramic chip is arranged at the bottoms of the red copper binding post and the insulating protective shell; an annular boss is arranged in the radial direction of the aluminum nitride ceramic chip; a disc-shaped boss is arranged in the center of the aluminum nitride ceramic chip; a liquid cooling plate is arranged below the aluminum nitride ceramic chip, and a flexible graphite heat conduction pad is filled between the aluminum nitride ceramic chip and the liquid cooling plate. The high-insulation and high-strength heat-resistant composite cable has excellent heat-conducting property, high insulation, high strength and temperature resistance, has a buffering and anti-vibration function, and can be repeatedly disassembled and reused.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of multilayer composite material heat-conducting insulation support seat, specifically a kind of insulation heat-conducting support seat applied to high-temperature environment, adaptation high-power fuse, belong to high-voltage electrical equipment heat dissipation structure technical field. BACKGROUND

[0002] With the continuous improvement of power density of electronic equipment, efficient heat dissipation and heat conduction become the key to ensure stable operation and performance of equipment. As a key protection component in the operation system of modern power equipment, the fuse often faces severe working challenges. For example, the power consumption of some fuses can rise to 100W when they are under high load, which causes a large amount of heat accumulation and a sharp rise in temperature, seriously threatening the safety of the device. To ensure stable operation of the equipment, high-thermal-conductivity materials are needed to efficiently conduct the heat generated by the fuse to the cold plate. At the same time, the insulation requirement between the fuse and the metal cold plate must be met to ensure the electrical insulation safety of the electrical system.

[0003] However, the existing support seat has certain defects. On the one hand, the insulation material used often has poor heat conduction performance, greatly hindering the smooth transfer of heat and easily causing local heat accumulation, affecting the overall performance and life of the equipment. On the other hand, the high-thermal-conductivity and high-conductivity (metal-based) support seat cannot meet the insulation requirement. SUMMARY

[0004] The utility model solves the technical problems in the prior art that the insulation material has poor heat conduction performance, greatly hinders the smooth transfer of heat, easily causes local heat accumulation, affects the overall performance and life of the equipment, and the high-thermal-conductivity and high-conductivity support seat cannot meet the insulation requirement.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A multilayer composite material heat-conducting insulation support seat, comprising a red copper terminal post, an insulation protective shell, an aluminum nitride ceramic sheet, a flexible graphite heat-conducting pad, a light hole bushing, a hexagonal head bolt spring washer assembly, and a steel wire screw sleeve.

[0007] The red copper terminal post is a cylindrical body with a steel wire screw sleeve at the upper center. A disc-shaped recess is formed at the bottom of the post, and a corresponding disc boss is provided outside the post body.

[0008] The insulation protective shell is arranged outside the red copper terminal post. A pair of mounting ears is provided at the lower ends of the insulation protective shell, and a light hole bushing is embedded in the mounting ears. A hexagonal head bolt spring washer assembly is arranged inside the mounting ears.

[0009] The aluminum nitride ceramic sheet is arranged at the bottom of the copper terminal post and the insulating protective shell; the aluminum nitride ceramic sheet is provided with an annular boss in the radial direction; and the aluminum nitride ceramic sheet is provided with a disc-shaped boss at the center.

[0010] The annular boss is embedded on the disc-shaped groove.

[0011] The aluminum nitride ceramic sheet is provided below with a liquid cooling plate, and a flexible graphite heat-conducting pad is filled between the aluminum nitride ceramic sheet and the liquid cooling plate.

[0012] The beneficial effects of the above technical solution are:

[0013] 1. The utility model has excellent heat conduction performance: adopting a "T1 copper + aluminum nitride + FX501" composite structure (T1 copper heat conduction coefficient is 401 W / m·K, and the conductivity is close to 100% IACS; the aluminum nitride heat conduction coefficient is greater than or equal to 170 W / m·K, the insulation strength is greater than 15 kV / mm, and the temperature resistance is greater than 800°C; the insulation strength of FX501 is greater than 20 kV / mm, and the temperature resistance is greater than 200°C), high heat conduction, high insulation, high strength and temperature resistance are considered, and the problems of large brittleness of traditional aluminum oxide ceramics and easy delamination of metal-plastic interface are solved.

[0014] 2. The utility model has excellent insulation performance: adopting a boss type creepage distance design, the annular boss on the surface of the aluminum nitride ceramic extends the creepage distance and disperses stress, and the edge guide angle R0.5mm eliminates the risk of sharp end discharge, and avoids the risk of cracking of brittle materials caused by the use of traditional grooves to extend the creepage distance.

[0015] 3. The utility model has a buffer and vibration resistance function: the aluminum nitride ceramic sheet is covered with FX501 (the compressive strength of the aluminum nitride ceramic is greater than or equal to 300MPa, and the elastic modulus of the FX501 phenolic resin glass fiber is greater than or equal to 8GPa), the bottom is pasted with a flexible graphite heat-conducting pad, and the top is welded with a copper terminal post, forming a rigid-flexible composite structure, which directly avoids the hard contact problem of the ceramic sheet and reduces the risk of cracking.

[0016] 4. The utility model has low contact thermal resistance: adopting a vacuum brazing process + nickel plating on the surface of copper + aluminum nitride ceramic sheet embedded combination design, the contact thermal resistance (less than 0.2K / W) is 50% lower than that of traditional plane contact, and the risk of oxidation failure of the contact surface is avoided.

[0017] 5. The utility model has the advantages of low cost, repeated disassembly and reuse, etc.: the bushing made of 316L stainless steel is embedded in the fixing lugs at both ends of the support seat, which can cope with the problem of cracks and damage caused by overpressure of plastic parts caused by repeated installation of bolts; cooperating with the injection molding integrated process, batch production and cost reduction can meet market demand. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] In the diagram: 1-Copper terminal block, 2-Insulating protective shell, 3-Aluminum nitride ceramic sheet, 4-Flexible graphite thermal pad, 5-Penetrating bushing, 6-Hexagonal head bolt spring washer assembly, 7-Wire thread insert.

[0020] Figure 2 This is a schematic diagram of the copper terminal block in this utility model.

[0021] In the diagram: 1.1 - Disc-shaped groove, 2.2 - Boss.

[0022] Figure 3 This is a schematic diagram of the aluminum nitride ceramic sheet in this utility model.

[0023] In the diagram: 3.1 - Disc-shaped boss, 3.2 - Annular boss.

[0024] Figure 4 This is a schematic diagram of the external shape of the present utility model. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings:

[0026] like Figure 1 As shown, a multilayer composite thermally conductive and insulating support includes a copper terminal block 1, an insulating protective shell 2, an aluminum nitride ceramic sheet 3, a flexible graphite thermally conductive pad 4, a perforated bushing 5, a hexagonal head bolt spring washer assembly 6, and a steel wire thread sleeve 7.

[0027] The copper terminal 1 is cylindrical, with a steel wire thread sleeve 7 located in the upper center to fix the fuse or other power devices.

[0028] like Figure 2 As shown, the bottom of the copper terminal 1 has a disc-shaped groove 1.1, and a corresponding boss 1.2 is provided on the outside of the terminal to realize the structure's anti-rotation and anti-loosening functions; the 0.5mm annular boss 3.2 is fitted into the 0.5mm disc-shaped groove 1.1, and the two are tightly connected by vacuum brazing process (Ag-Cu-Ti solder) to realize the AIN (aluminum nitride ceramic) + copper composite structure with low thermal resistance, high insulation and high thermal conductivity;

[0029] The insulating protective shell 2 is arranged outside the red copper terminal post 1, FX501 is injected into a special mold to form the insulating protective shell 2 of FX501, so as to wrap the red copper terminal post 1 and the aluminum nitride ceramic sheet 3 to form an integrated structure; a pair of mounting ears is arranged at the lower two ends of the insulating protective shell 2 of FX501, a light hole bushing 5 is embedded in the mounting ears, and a hexagonal head bolt elastic flat washer assembly 6 is arranged in the mounting ears; the risk of rupture of the insulating protective shell 2 of FX501 caused by overpressure when the hexagonal head bolt elastic flat washer assembly 6 is fastened is effectively avoided;

[0030] As shown in Figure 3 , the aluminum nitride ceramic sheet 3 is arranged at the bottom of the red copper terminal post 1 and the insulating protective shell 2 of FX501; the aluminum nitride ceramic sheet 3 is provided with an annular boss in the radial direction, the height of the annular boss is 0.5 mm, and the width of the annular boss is 1 mm; the aluminum nitride ceramic sheet 3 is provided with a disc-shaped boss 3.1 at the center, the height of the disc-shaped boss 3.1 is 0.5 mm; the creepage distance of the red copper terminal post 3 to the metal base is extended to 6 mm; the radial size of the aluminum nitride ceramic sheet 3 or the number and height of the annular bosses arranged in the radial direction can be expanded according to specific creepage requirements;

[0031] As shown in Figure 3 , the aluminum nitride ceramic sheet 3 is provided with a liquid cooling plate below, and the aluminum nitride ceramic sheet 3 and the liquid cooling plate are filled with a flexible graphite heat-conducting pad 4 (thickness 0.2 mm-0.3 mm, thermal conductivity coefficient 5 W / m·K, compression rate 15%-20%) therebetween, which plays a role of compensating assembly tolerance, reducing the contact thermal resistance between the aluminum nitride ceramic sheet 3 and the liquid cooling plate and buffering vibration and impact;

[0032] As shown in Figure 4 , the mounting ear is deviated from the bottom end by 4 mm, and the support seat can be mounted on the boss formed by the liquid cooling plate or the metal base, so as to reduce the problem of difficult flow channel design caused by avoiding the threaded hole.

Claims

1. A multilayer composite thermally conductive insulating support, characterized in that: It includes red copper terminal post (1), insulation protection shell (2), aluminum nitride ceramic sheet (3), flexible graphite heat conduction pad (4), light hole bushing (5), hexagonal head bolt elastic flat washer assembly (6) and steel wire screw sleeve (7); The red copper terminal post (1) is a cylinder, and a steel wire screw sleeve (7) is arranged at the upper part of the center; a disc-shaped groove (1.1) is arranged at the bottom of the red copper terminal post (1), and a corresponding boss (1.2) is arranged outside the cylinder; The insulation protection shell (2) is arranged outside the red copper terminal post (1); a pair of mounting ears is arranged at the lower part of the insulation protection shell (2), and a light hole bushing (5) is embedded in the mounting ears; and a hexagonal head bolt elastic flat washer assembly (6) is arranged in the mounting ears; The aluminum nitride ceramic sheet (3) is arranged at the bottom of the red copper terminal post (1) and the insulation protection shell (2); a ring-shaped boss (3.2) is arranged in the radial direction of the aluminum nitride ceramic sheet (3); and a disc-shaped boss (3.1) is arranged at the center of the aluminum nitride ceramic sheet (3); The ring-shaped boss (3.2) is embedded on the disc-shaped groove (1.1); A liquid cooling plate is arranged below the aluminum nitride ceramic sheet (3), and a flexible graphite heat conduction pad (4) is filled between the aluminum nitride ceramic sheet (3) and the liquid cooling plate.

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