Brazing structure of a penetrating electrode

Abstract

The utility model discloses a brazing structure of through electrode, through the reform stainless steel flange, greatly reduce the ceramic risk of cracking, improve the brazing yield. The brazing structure of through electrode includes ceramic insulating part, transition ring and stainless steel ring, the transition ring includes the circular tube portion matched with the circumference of ceramic insulating part, and the disc portion integrally connected in the lower end of circular tube portion and along the radial direction of circular tube portion outward extension, the circular tube portion is set in the circumference of ceramic insulating part, and the joint is realized through the mode of brazing, the stainless steel ring is set in the circumference of circular tube portion, and is attached in the upper surface of disc portion, the lower surface of stainless steel ring is connected with the disc portion through the mode of laser welding.

Description

Technical Field

[0001] This utility model belongs to the field of penetrating electrode technology, and specifically refers to a brazing structure for a penetrating electrode. Background Technology

[0002] In high-temperature brazing environments, the expansion coefficients of ceramics and stainless steel differ significantly, and stainless steel flanges typically have a thicker wall. This makes it easy for the ceramic insulating adhesive to crack when brazing the stainless steel flanges to ceramic insulating components, thus affecting the airtightness of the product. Utility Model Content

[0003] The main purpose of this invention is to provide a brazing structure that penetrates the electrode, thereby solving the problems existing in the prior art. By modifying the stainless steel flange, the risk of ceramic cracking is greatly reduced, and the brazing yield is improved.

[0004] To achieve the above objectives, the solution of this utility model is: A brazing structure for a penetrating electrode includes a ceramic insulator, a transition ring, and a stainless steel ring. The transition ring includes a circular tube portion that matches the circumferential surface of the ceramic insulator, and a disc portion integrally connected to the lower end of the circular tube portion and extending radially outward along the circular tube portion. The circular tube portion is sleeved on the circumferential surface of the ceramic insulator, and the two are connected by brazing. The stainless steel ring is sleeved on the circumferential surface of the circular tube portion and adheres to the upper surface of the disc portion. The lower surface of the stainless steel ring is connected to the disc portion by laser welding.

[0005] The transition ring is made of Kovar alloy.

[0006] The circular tube portion and the circumferential surface of the ceramic insulating component are brazed using silver-based solder.

[0007] The thickness of the circular tube portion of the transition ring is controlled between 0.3 and 1.2 mm.

[0008] The lower surface of the stainless steel ring is provided with a concave step portion, the shape of which matches the shape of the disc portion, and the disc portion is embedded in the step portion.

[0009] The brazing structure of the penetrating electrode further includes a first connector and a second connector; the first connector and the second connector are inserted into the ceramic insulating component from above and below, respectively, and are connected to the ceramic insulating component by brazing.

[0010] After adopting the above technical solution, the present invention has the following technical effects: This invention modifies the existing stainless steel flange into two parts: a transition ring and a stainless steel ring. The two parts can be made of different materials. For example, the material of the transition ring can be similar to the coefficient of thermal expansion of ceramics. Therefore, during brazing, the tensile force on the ceramic can be greatly reduced, the risk of ceramic cracking can be reduced, and the brazing yield can be improved. At the same time, the stainless steel ring and the disc are connected by laser welding, which can ensure airtightness and prevent the stainless steel ring from exerting tensile force on other parts in a high-temperature environment. Compared with vacuum brazing, it also reduces the welding cost. Attached Figure Description

[0011] Figure 1 This is a perspective view of a specific embodiment of the present utility model.

[0012] Figure 2 This is a front view of a specific embodiment of the present utility model.

[0013] Figure 3 This is a cross-sectional view of a specific embodiment of the present utility model.

[0014] Figure 4 This is an exploded view of a specific embodiment of the present utility model.

[0015] Explanation of icon numbers: 1-Ceramic insulating components; 2-Transition ring; 21-Circular tube section; 22-Disc section; 3-Stainless steel ring; 31-Stepped section; 4-First connector; 5-Second connector. Detailed Implementation

[0016] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0017] refer to Figures 1 to 4 As shown, this utility model discloses a brazing structure for penetrating electrodes, including a ceramic insulating component 1, a transition ring 2, and a stainless steel ring 3; The transition ring 2 includes a circular tube portion 21 that matches the circumferential surface of the ceramic insulator 1, and a disc portion 22 integrally connected to the lower end of the circular tube portion 21 and extending radially outward along the circular tube portion 21; thereby, the circumferential surface of the transition ring 2 forms an L-shaped cross-sectional structure. The circular tube 21 is fitted onto the circumferential surface of the ceramic insulating component 1, and the two are connected by brazing. The stainless steel ring 3 is fitted around the circumference of the cylindrical tube 21 and is attached to the upper surface of the disc 22. The lower surface of the stainless steel ring 3 is connected to the disc 22 by laser welding.

[0018] Through the above solution, this utility model modifies the existing stainless steel flange into two parts: a transition ring 2 and a stainless steel ring 3. The two parts can be made of different materials. For example, the material of the transition ring 2 can be similar to the coefficient of thermal expansion of ceramics. Therefore, during brazing, the tensile force on the ceramic can be greatly reduced, the risk of ceramic cracking can be reduced, and the brazing yield can be improved. At the same time, the stainless steel ring 3 is connected to the disc part 22 by laser welding, which can ensure airtightness and prevent the stainless steel ring 3 from exerting tensile force on other parts in a high-temperature environment. Compared with vacuum brazing, it also reduces the welding cost.

[0019] The following are specific embodiments of the present invention.

[0020] The aforementioned transition ring 2 is made of Kovar alloy. Kovar alloy, also known as a constant expansion alloy, has good thermal expansion matching properties, which can better match the ceramic insulation component 1. During the brazing process, it can effectively alleviate the stress caused by the difference in expansion coefficients, further reducing the risk of ceramic cracking.

[0021] In practice, the Kovar alloy is first machined into the shape of a transition ring 2, which consists of a circular tube portion 21 and a disc portion 22. The inner diameter of the circular tube portion 21 is precisely machined according to the circumferential dimensions of the ceramic insulator 1 to ensure a good fitting effect. Next, the circular tube portion 21 of the transition ring 2 is fitted onto the circumferential surface of the ceramic insulator 1, and then brazed using silver-based solder. During the brazing process, parameters such as temperature and time are strictly controlled to ensure brazing quality. After the brazing of the ceramic insulator 1 and the transition ring 2 is completed, the transition ring 2 is then connected to the stainless steel ring 3 by laser welding. Laser welding has advantages such as high welding precision and a small heat-affected zone, which can ensure the airtightness of the welded part.

[0022] The aforementioned circular tube portion 21 is brazed to the circumferential surface of the ceramic insulating component 1 using silver-based solder. Silver-based solder possesses good fluidity and wettability, enabling it to fully fill the minute gaps between the circular tube portion 21 and the circumferential surface of the ceramic insulating component 1 during brazing, forming a strong and reliable brazed joint. Simultaneously, the silver-based solder has a moderate melting point, meeting the brazing process requirements while avoiding excessive heat impact on the ceramic insulating component 1 and the transition ring 2, thus ensuring the stability and reliability of the welded joint. During the brazing process, appropriate protection of the welded joint is also necessary to prevent oxidation and contamination, ensuring brazing quality.

[0023] The thickness of the circular tube portion 21 of the transition ring 2 is controlled within the range of 0.3~1.2mm. Within this thickness range, the circular tube portion 21 of the transition ring 2 can ensure sufficient strength to support the stainless steel ring 3 and withstand various stresses in subsequent processes, without causing excessive tensile force on the ceramic insulator 1 during brazing due to excessive thickness. Simultaneously, this thickness range also facilitates the uniform filling of the silver-based solder between the two components, forming a good and stable brazed connection, further improving the reliability and airtightness of the brazing. In actual production, this thickness range can be precisely selected and adjusted according to the specific dimensions and material of the ceramic insulator 1, as well as the temperature and pressure conditions of the operating environment, to achieve the best brazing effect and product performance.

[0024] See Figure 3 The lower surface of the stainless steel ring 3 is provided with a concave step portion 31, which matches the shape of the disc portion 22 so that the disc portion 22 is embedded within the step portion 31. By providing the concave step portion 31, the contact area between the stainless steel ring 3 and the disc portion 22 is increased, which not only improves the stability of their connection but also better disperses welding stress during laser welding, avoiding welding defects caused by stress concentration. Simultaneously, this embedded structure makes the entire brazing structure of the penetrating electrode more compact, which is beneficial to improving the overall performance and reliability of the product. In actual processing, the size and shape of the step portion 31 need to be precisely designed and processed according to the specific situation of the disc portion 22 to ensure a perfect match. Furthermore, before laser welding, the contact surfaces of the step portion 31 and the disc portion 22 need to be cleaned and treated to remove impurities such as oil and oxides to ensure welding quality.

[0025] This utility model also includes a first connector 4 and a second connector 5; the first connector 4 and the second connector 5 are respectively inserted into the ceramic insulating component 1 from above and below and connected to the ceramic insulating component 1 by brazing, and together they constitute an oxygen-free copper electrode (product requirement) for conducting electricity and heat. Among them, the first connector 4 can be mechanically connected to external equipment.

[0026] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A brazing structure that penetrates an electrode, characterized in that: Includes ceramic insulators, transition rings, and stainless steel rings; The transition ring includes a circular tube portion that matches the circumferential surface of the ceramic insulator, and a disc portion integrally connected to the lower end of the circular tube portion and extending radially outward along the circular tube portion. The circular tube is sleeved on the circumferential surface of the ceramic insulator, and the two are connected by brazing. The stainless steel ring is sleeved on the circumference of the circular tube and attached to the upper surface of the disc. The lower surface of the stainless steel ring is connected to the disc by laser welding.

2. The brazing structure with penetrating electrode as described in claim 1, characterized in that: The transition ring is made of Kovar alloy.

3. The brazing structure with penetrating electrode as described in claim 1, characterized in that: The circular tube portion and the circumferential surface of the ceramic insulating component are brazed using silver-based solder.

4. The brazing structure with penetrating electrode as described in claim 1, characterized in that: The thickness of the circular tube portion of the transition ring is controlled between 0.3 and 1.2 mm.

5. The brazing structure with a penetrating electrode as described in claim 1, characterized in that: The lower surface of the stainless steel ring is provided with a concave step portion, the shape of which matches the shape of the disc portion, and the disc portion is embedded in the step portion.

6. The brazing structure with penetrating electrode as described in claim 1, characterized in that: It also includes a first connector and a second connector; the first connector and the second connector are inserted into the ceramic insulator from above and below, respectively, and are connected to the ceramic insulator by brazing.

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