Outer shielding case fixing structure of vacuum arc-extinguishing chamber product

Abstract

The utility model relates to the field of middle and high voltage vacuum switches, in particular to an outer shielding case fixing structure of a vacuum arc-extinguishing chamber product, which comprises an outer shielding case and a sealing ring, the sealing ring is exposed outside an arc-extinguishing chamber, the outer shielding case is made of stainless steel, and the sealing ring is made of oxygen-free copper. The outer shielding cover is connected with the sealing ring in a brazing mode, a mechanical combination spot welding mode or a mechanical combination gluing mode. According to the utility model, various connection modes of the outer shielding case and the sealing ring are provided, including brazing, mechanical combination spot welding and mechanical combination gluing, the requirements of different application scenes can be met, the stability of the outer shielding case under different conditions is ensured, the connection is firm by the brazing mode, the operation is simple by the mechanical combination spot welding mode, and the cost is low. The mode of combining machinery with glue not only solves the problem of welding cracks possibly generated by brazing, but also overcomes the defect that mechanical fixation is not firm.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medium and high voltage vacuum switch, concretely to an outer shielding cover fixing structure of vacuum arc extinguishing chamber product. BACKGROUND

[0002] With the continuous improvement of the research level of vacuum arc extinguishing chamber, the application range of vacuum arc extinguishing chamber is developing towards high voltage grade and miniaturization, which requires the vacuum arc extinguishing chamber to have higher insulation parameters and better insulation performance. Compared with conventional products, the outer insulation level of high voltage products under the condition of limited porcelain shell height is more difficult to realize.

[0003] In the actual application of the vacuum arc extinguishing chamber, the external insulation performance directly relates to the operation safety and reliability of the entire switch device. Under the condition of limited porcelain shell height, the electric field at the three-phase junction of the vacuum arc extinguishing chamber exterior in air (or other insulation medium), metal and ceramic is not well distributed, which may cause electric field aggregation at the welding position of the ceramic shell and the end plate, and even lead to insulation damage of the vacuum arc extinguishing chamber and switch failure. Therefore, the development of the vacuum arc extinguishing chamber towards high voltage grade application and miniaturization requires the vacuum arc extinguishing chamber to have better external insulation performance. SUMMARY

[0004] In view of the unstable connection at the interface of the outer shielding cover in the prior art, the utility model provides an outer shielding cover fixing structure of vacuum arc extinguishing chamber product.

[0005] The utility model is realized through the following technical schemes:

[0006] An outer shielding cover fixing structure of vacuum arc extinguishing chamber product, comprising an outer shielding cover and a sealing ring, the sealing ring is exposed outside the arc extinguishing chamber, the outer shielding cover is made of stainless steel, the sealing ring is made of oxygen-free copper, and the outer shielding cover is connected with the sealing ring by brazing, mechanical combination spot welding or mechanical combination gluing.

[0007] Preferably, the outer shielding cover is in the shape of a ring.

[0008] Preferably, the outer side of the outer shielding cover is in the shape of an arc.

[0009] Preferably, the inner wall of the outer shielding cover is provided with a plurality of matching strips at intervals along the circumference thereof, the matching strips are provided with grooves, and the grooves are matched with the outer side protrusions of the sealing ring.

[0010] Preferably, the depth to which the protrusions of the sealing ring extend into the grooves is 3-5 mm.

[0011] Preferably, the distance between adjacent matching strips is equal to the distance of the outer side grooves of the sealing ring.

[0012] Preferably, when the outer shield is connected with the sealing ring by brazing, the outer shield is in the form of a closed ring, there is a gap of 0.5-1mm between the width of the groove and the thickness of the protrusion on the outer side of the sealing ring, and Ag-based solder is used in brazing.

[0013] Preferably, when the outer shield is connected with the sealing ring by mechanical bonding spot welding, the outer shield is in the form of an open ring, there is a gap of 2-3mm between the width of the groove and the thickness of the protrusion on the outer side of the sealing ring, and a sleeve is arranged at the opening by spot welding.

[0014] Preferably, when the outer shield is connected with the sealing ring by mechanical bonding adhesive bonding, the outer shield is in the form of a closed ring, the groove is filled with metal glue, and the protrusion of the sealing ring is located in the groove; there is a gap of 2-3mm between the width of the groove and the thickness of the protrusion on the outer side of the sealing ring.

[0015] Preferably, the metal glue is an environmentally friendly single-component room-temperature curing silicone rubber.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model discloses a kind of outer shield fixing structure of vacuum arc-extinguishing chamber product, provide multiple connection modes of outer shield and sealing ring, including brazing, mechanical bonding spot welding and mechanical bonding adhesive bonding, can satisfy the demand of different application scenarios, ensure the stability of outer shield under different conditions, wherein brazing mode is connected firmly, the mode of mechanical bonding spot welding is simple to operate, the mode of mechanical bonding adhesive bonding solves the welding crack problem that brazing can generate, and also overcome the shortcoming that mechanical fixation is not firm.

[0018] Further, the size of the groove is limited, which can ensure the tightness of the connection and avoid the problems of difficult installation or stress concentration caused by too tight fit.

[0019] Further, the distance between adjacent fitting strips is equal to the distance of the outer groove of the sealing ring, which ensures the uniform cooperation of the outer shield and the sealing ring in the circumferential direction and improves the stability and reliability of the connection.

[0020] Further, brazing mode can ensure sealing and fastening, and Ag-based solder is used to improve the electrical conductivity of the connection.

[0021] Further, the mode of mechanical bonding spot welding meets the requirements of easy installation and disassembly, and the sleeve is arranged to enhance the stability of the connection.

[0022] Further, the mode of mechanical bonding adhesive bonding ensures the sealing and stability of the connection through metal glue, and further optimizes the metal glue to ensure the bonding strength and insulation performance. After the metal glue is cured, the fixing is completed, without the need for additional heating or cooling process, which simplifies the production process. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the sealing ring in the outer shielding cover fixing structure of a vacuum interrupter product according to this utility model;

[0024] Figure 2 This is a schematic diagram of the outer shield in the outer shield fixing structure of a vacuum interrupter product according to this utility model;

[0025] Figure 3 This is a schematic diagram of the sealing ring and the open circular outer shielding cover being connected by brazing.

[0026] Figure 4 This is a schematic diagram of the sealing ring and the open circular outer shielding cover being mechanically spot-welded together.

[0027] Figure 5 This is a schematic diagram of the outer shielding cover fixing structure of a vacuum interrupter product according to this utility model.

[0028] In the diagram, 1 is solder; 2 is the outer shield; 3 is the sealing ring; 4 is the thin-walled tube; 5 is the metal adhesive; 21 is the left edge of the outer shield; and 22 is the right edge of the outer shield. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to specific embodiments. The description is for explanation and not limitation of the present invention.

[0030] This utility model discloses a fixing structure for the outer shield of a vacuum interrupter product, including an outer shield 2 and a sealing ring 3. The sealing ring 3 is exposed outside the interrupter. The outer shield 2 is made of stainless steel, and the sealing ring 3 is made of oxygen-free copper. The outer shield 2 is annular, with its inner wall in contact with the product and the sealing ring 3, and its inner side in contact with the outer wall of the interrupter product. Its outer side is arc-shaped to avoid sharp points. (Refer to...) Figure 1 , 2 The inner wall of the outer shield 2 is provided with multiple mating strips spaced apart along its circumference. The mating strips are provided with grooves, which mate with the outer protrusions of the sealing ring 3. The protrusions of the sealing ring 3 extend into the grooves to a depth of 3-5 mm, and the distance between adjacent mating strips is equal to the distance between the outer grooves of the sealing ring 3.

[0031] The outer shield 2 is connected to the sealing ring 3 by brazing, mechanical spot welding or mechanical adhesive bonding.

[0032] Specifically, refer to Figure 3 When the outer shield 2 and the sealing ring 3 are connected by brazing, the outer shield 2 is in the shape of a closed ring, and there is a gap of 0.5~1mm between the width of the groove and the thickness of the outer protrusion of the sealing ring. Ag-based solder 1 is used for brazing.

[0033] participation Figure 4 When the outer shield 2 and the sealing ring 3 are connected by mechanical combination spot welding, the outer shield 2 is assembled on the exposed sealing ring 3 after the product is completed by brazing, the outer shield 2 is an open circular ring, there is a groove in the middle to cooperate with the sealing ring 3, there is a gap of 2-3mm between the width of the groove and the thickness of the protrusion on the outer side of the sealing ring 3, and the gap is welded by a sleeve (such as a thin-walled pipe 4) at the gap formed by the left edge 21 of the outer shield and the right edge 22 of the outer shield.

[0034] reference Figure 5 When the outer shield 2 and the sealing ring 3 are connected by mechanical combination spot welding, the outer shield 2 is an open circular ring, there is a groove in the middle to cooperate with the sealing ring 3, there is a gap of 2-3mm between the width of the groove and the thickness of the protrusion on the outer side of the sealing ring 3, and the gap is welded by a sleeve (such as a thin-walled pipe 4) at the gap formed by the left edge 21 of the outer shield and the right edge 22 of the outer shield.

[0035] When installing, after the product is completed by brazing, the outer shield 2 is moved from the top to the bottom of the product, the groove of the outer shield 2 is staggered with the protrusion of the sealing ring 3, and is moved downward until the groove of the outer shield 2 and the exposed sealing ring 3 are at the same horizontal plane, the groove is aligned with the protrusion of the sealing ring 3, and is rotated and buckled to make the protrusion of the sealing ring 3 coincide with the groove of the shield until it is assembled in place, and the glue is cured to complete the fixation, thereby solving the problems of welding cracks in the brazing method and the problems of unstable fixation of the outer shield 2 and the unattractive interface in the mechanical fixation method. The method is simple and easy to operate, the fixation quality is firm, and the insulation capacity of the vacuum arc chamber is effectively improved.

[0036] The utility model provides a plurality of connection modes of outer shield 2 and sealing ring 3, including brazing, mechanical combination spot welding and mechanical combination adhesive, which can meet the needs of different application scenarios, wherein the brazing connection is firm, the mechanical combination spot welding operation is simple, and the mechanical combination adhesive mode solves the welding crack problem of brazing and overcomes the defect of unstable mechanical fixation.

[0037] The above merely describes preferred embodiments of the present application, and is not intended to limit the technical solutions of the present application in any way. Those skilled in the art should understand that, without departing from the spirit and principle of the present application, the technical solutions can be modified and replaced in several simple ways, and these modifications and replacements also fall within the protection scope of the claims.

Claims

1. An external shield fixing structure of a vacuum interrupter product, characterized by, The outer shield cover (2) and the sealing ring (3) are connected by brazing, mechanical joint spot welding or mechanical joint gluing.

2. The external shield fixing structure of a vacuum interrupter product according to claim 1, characterized in that, The outer shield cover (2) is in the shape of a ring.

3. The external shield fixing structure of a vacuum interrupter product according to claim 1, characterized in that, The outer side of the outer shield cover (2) is arc-shaped.

4. The external shield fixing structure of a vacuum interrupter product according to claim 1, characterized in that, The inner wall of the outer shield cover (2) is provided with a plurality of matching strips along the circumferential direction, and the matching strips are provided with grooves.

5. The external shield fixing structure of a vacuum interrupter product according to claim 3, wherein The depth of the protrusion of the sealing ring (3) extending into the groove is 3-5 mm.

6. The external shield fixing structure of a vacuum interrupter product according to claim 3, wherein The distance between adjacent matching strips is equal to the distance of the groove on the outer side of the sealing ring (3).

7. The external shield fixing structure of a vacuum interrupter product according to claim 3, wherein When the outer shield cover (2) and the sealing ring (3) are connected by brazing, the outer shield cover (2) is in the shape of a closed ring, there is a gap of 0.5-1 mm between the width of the groove and the thickness of the protrusion on the outer side of the sealing ring (3), and Ag-based solder (1) is used for brazing.

8. The external shield fixing structure of a vacuum interrupter product according to claim 3, characterized in that, When the outer shield cover (2) and the sealing ring (3) are connected by mechanical joint spot welding, the outer shield cover (2) is in the shape of an open ring, there is a gap of 2-3 mm between the width of the groove and the thickness of the protrusion on the outer side of the sealing ring (3), and a sleeve is provided at the opening by spot welding.

9. The external shield fixing structure of a vacuum interrupter product according to claim 3, characterized in that, When the outer shield cover (2) and the sealing ring (3) are connected by mechanical joint gluing, the outer shield cover (2) is in the shape of a closed ring, the groove is filled with metal glue (5), and the outer wall of the sealing ring (3) is located in the groove; there is a gap of 2-3 mm between the width of the groove and the thickness of the protrusion on the outer side of the sealing ring (3).

10. The external shield fixing structure of a vacuum interrupter product according to claim 9, characterized by, The metal glue (5) is an environmentally friendly single-component room temperature curing silicone rubber.

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