A vacuum brazing fixture

Abstract

The present invention relates to the field of brazing technology, and in particular to a vacuum brazing fixture. A vacuum brazing fixture is used for connecting and positioning a divertor wall unit and a heat sink material, comprising a bottom plate, bolts, an upper fixing block, a lower fixing block, a spring sheet and a positioning block; the force applied by the nut is converted into a balanced force along the bolt column through the design of the upper and lower fixing blocks and the upper and lower spring sheets, and the force is used to achieve accurate positioning between different modules through the positioning block through the cooperation of the bottom plate and the bolt column.

Description

Technical Field

[0001] The invention relates to the technical field of brazing, and in particular to a clamp for vacuum brazing. Background Art

[0002] In a fusion reactor, the divertor is a very important component, which is composed of plasma-facing material and heat sink material, and its structure is divided into a through-tube structure and a flat plate structure. In the flat plate structure, the connection between the plasma-facing material and the heat sink material is completed by brazing.

[0003] The biggest problem in connecting the plasma-facing material and the copper heat sink material is the large difference in thermal expansion coefficient between the wall material and copper. The difference in thermal expansion coefficient between the wall material and the copper alloy will cause huge thermal stress when the two are connected, which will cause cracks in the brazing connection interface and reduce the service reliability of the wall component. To solve this problem, the wall material is generally cut into small pieces and a layer of oxygen-free pure copper is cast on the surface of the wall material to relieve the huge thermal stress.

[0004] During the preparation process of the first wall member, the surface wall material of cast pure copper may be laterally connected together, thereby increasing the thermal stress between the heat sink material and the surface wall material.

[0005] Therefore, it is necessary to accurately position the small pieces of the surface wall material during the connection process between the surface wall material and the heat sink material to prevent the small pieces of the surface wall material from lateral adhesion. However, during the clamping process and high-temperature brazing process, ordinary clamps will cause deviations in the relative positions of the brazed parts due to thermal expansion and contraction.

[0006] Moreover, the unbalanced force applied by ordinary clamps may cause the surface wall material to partially warp up, resulting in large welding defects during the welding process. Summary of the invention

[0007] The purpose of the present invention is to provide a vacuum brazing fixture with balanced force, good high temperature stability and easy operation in view of the above-mentioned defects in the prior art.

[0008] The technical solution of the present invention is as follows:

[0009] A vacuum brazing fixture, used for connecting and positioning a divertor wall unit and a heat sink material, comprises a bottom plate, bolts, an upper fixing block, a lower fixing block, a spring sheet and a positioning block;

[0010] The fixture bottom plate comprises a base plate, a limiting groove and a plurality of bolt holes arranged on a surface of the base plate, wherein the number of the bolt holes is determined according to the size of the divertor component;

[0011] The bolt comprises a bolt column and a nut. Both ends of the bolt column are threaded. The thread lengths of the two ends are long and short. The short thread end is used to connect with the bottom plate, and the long thread end is used in conjunction with the nut to directly apply pressure to the upper fixing block.

[0012] The fixing block and the spring sheet are divided into upper and lower types, and both need to be used in conjunction with the bolt column. The upper fixing block applies a force to the upper spring sheet in the direction of the bottom plate under the action of the nut, and the upper spring sheet will produce elastic deformation and apply a force perpendicular to the bottom plate to the lower fixing block. Under this force, the lower fixing block applies a balanced force to the lower spring sheet through the square protrusions on both sides of the bottom.

[0013] A through threaded hole is provided in the middle of the lower fixing block, and the positioning block is connected to the lower positioning block through the cooperation of the screw rod and the threaded hole;

[0014] The positioning block directly acts on the workpiece surface, and under the balanced force applied by the lower spring sheet 106 , it will apply a uniform force along the bolt column toward the bottom plate.

[0015] The bottom of the lower positioning block is provided with two raised plane structures downwards, and triangular plane protrusions are provided upwards on both sides of the plane for connection with the lower fixing block.

[0016] The bottom size of the lower positioning block is designed to match the size of the limiting groove set on the bottom plate.

[0017] Both sides of the upper fixing block are provided with nuts with downward semicircular protrusions.

[0018] The upper part of the lower fixing block is a triangular protrusion, that is, the contact part between the upper part of the lower fixing block and the upper elastic sheet is one side of the vertex of the triangle, forming a line contact.

[0019] The upper spring piece will undergo a certain elastic deformation under the combined action of the downward force on both sides of the upper fixed block and the upward force on the vertex of the lower fixed block. The elastic deformation amount is adjustable. In actual use, the elastic deformation amount can be adjusted according to the actual condition of the workpiece.

[0020] The clamps can be combined in multiple lengths side by side.

[0021] The beneficial effects of the present invention are:

[0022] This fixture solves the positioning deviation of ordinary fixtures and the equal degree matching problem between different modules.

[0023] The force applied by the nut is converted into a balanced force along the bolt column through the design of the upper and lower fixing blocks and the upper and lower spring sheets, and the force is used to realize accurate positioning between different modules through the positioning blocks through the cooperation of the base plate and the bolt column. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a schematic diagram of the clamp of the present invention;

[0025] Figure 2 A schematic diagram of the structure of a fixture for a single workpiece embodiment of the present invention;

[0026] Figure 3 It is a schematic structural diagram of a fixture of a multi-workpiece embodiment of the present invention.

[0027] In the figure: 100 is a base plate, 101 is a bolt column, 102 is a nut, 103 is an upper fixing block, 104 is an upper spring sheet, 105 is a lower fixing block, 106 is a lower spring sheet, and 107 is a positioning block. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] A vacuum brazing fixture is used for connecting and positioning a divertor wall unit and a heat sink material, comprising: a bottom plate 100, bolts, an upper fixing block 103, a lower fixing block 105, a spring piece 104 and a positioning block 107.

[0030] The fixture bottom plate 100 includes a base plate, a limiting groove and a plurality of bolt holes arranged on a surface of the base plate, and the number of the bolt holes is determined according to the size of the divertor component.

[0031] The bolt includes a bolt column 101 and a nut 102. Both ends of the bolt column 101 are threaded, and the length of the threads at both ends is long and short. The short threaded end is used to connect with the base plate 100, and the long threaded end is used in conjunction with the nut 102 to directly apply pressure to the upper fixing block 103.

[0032] The fixing block and spring sheet are divided into upper and lower types, and both need to be used in conjunction with the bolt column 101. The downward semicircular protrusions on both sides of the upper fixing block 103 exert a force on the upper spring sheet 104 toward the bottom plate 100 under the action of the nut 102. The upper spring sheet 104 will produce elastic deformation and exert a force perpendicular to the bottom plate on the lower fixing block 105. Under this force, the lower fixing block 105 exerts a balanced force on the lower spring sheet 106 through the square protrusions on both sides of the bottom.

[0033] The upper portion of the lower fixing block 105 is a triangular protrusion, that is, the contact portion between the upper portion of the lower fixing block 105 and the upper elastic sheet 104 is one side of the vertex of the triangle, forming a line contact.

[0034] A threaded hole is provided in the middle of the lower fixing block 105 , and the positioning block 107 is connected to the lower positioning block 105 through the cooperation of a screw rod and the threaded hole.

[0035] The upper spring piece 104 will undergo a certain elastic deformation under the combined action of the downward force on both sides of the upper fixing block 103 and the upward force on the vertex of the lower fixing block 105. The elastic deformation amount is adjustable and can be adjusted according to the actual condition of the workpiece in actual use.

[0036] The positioning block directly acts on the workpiece surface, and under the balanced force applied by the lower spring sheet 106 , it will apply a uniform force along the bolt column 101 toward the bottom plate 100 , thereby ensuring a tight combination of the divertor wall unit and the heat sink material.

[0037] The above-mentioned clamp applies a force toward the bottom plate 100 through the cooperation of the bolt column 101 and the nut 102. This force is transformed into a balanced force along the bolt column 101 toward the bottom plate 100 under the joint action of the upper and lower fixing blocks and the upper and lower spring sheets, and is finally applied to the positioning block 107 to position the divertor wall unit on the heat sink material.

[0038] The bottom of the lower positioning block 107 is provided with two raised plane structures downwards, and triangular plane protrusions are provided upwards on both sides of the plane for connection with the lower fixing block 105 .

[0039] The bottom size of the lower positioning block 107 is designed to match the size of the limiting groove provided on the bottom plate 100 .

[0040] The device can be used with multiple clamps in a longitudinal combination and side by side to fix longer materials, such as Figure 3 shown.

Claims

1. A vacuum brazing fixture, used for connecting and positioning the divertor wall unit and the heat sink material, comprising a bottom plate, bolts, an upper fixing block, a lower fixing block, a spring sheet and a positioning block; Features: The bottom plate includes a base plate, a limiting groove and a plurality of bolt holes arranged on a surface of the base plate, and the number of the bolt holes is determined according to the size of the divertor component; The bolt comprises a bolt column and a nut. Both ends of the bolt column are threaded. The thread lengths of the two ends are long and short. The short thread end is used to connect with the bottom plate, and the long thread end is used in conjunction with the nut to directly apply pressure to the upper fixing block. The fixing block and the spring sheet are divided into upper and lower types, and both need to be used in conjunction with the bolt column. The upper fixing block applies a force to the upper spring sheet in the direction of the bottom plate under the action of the nut, and the upper spring sheet will produce elastic deformation and apply a force perpendicular to the bottom plate to the lower fixing block. Under this force, the lower fixing block applies a balanced force to the lower spring sheet through the square protrusions on both sides of the bottom. A through threaded hole is provided in the middle of the lower fixing block, and the positioning block is connected to the lower positioning block through the cooperation of the screw rod and the threaded hole; The positioning block directly acts on the surface of the workpiece, and under the balanced force applied by the lower spring sheet, it will apply a uniform force along the bolt column toward the bottom plate.

2. A vacuum brazing fixture as claimed in claim 1, characterized in that: The bottom of the lower positioning block is provided with two raised plane structures downwards, and triangular plane protrusions are provided upwards on both sides of the plane for connection with the lower fixing block.

3. A vacuum brazing fixture as claimed in claim 1, characterized in that: The bottom size of the lower positioning block is designed to match the size of the limiting groove set on the bottom plate.

4. A vacuum brazing fixture as claimed in claim 1, characterized in that: Both sides of the upper fixing block are provided with nuts with downward semicircular protrusions.

5. A vacuum brazing fixture as claimed in claim 1, characterized in that: The upper part of the lower fixing block is a triangular protrusion, that is, the contact part between the upper part of the lower fixing block and the upper elastic sheet is one side of the vertex of the triangle, forming a line contact.

6. A vacuum brazing fixture as claimed in claim 1, characterized in that: The upper spring sheet will be elastically deformed under the combined action of the downward force on both sides of the upper fixed block and the upward force on the vertex of the lower fixed block. The elastic deformation amount is adjustable. In actual use, the elastic deformation amount can be adjusted according to the actual condition of the workpiece.

7. A vacuum brazing fixture as claimed in claim 1, characterized in that: The clamps can be combined in multiple lengths side by side.

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