Shell assembly of vacuum arc-extinguishing chamber and vacuum arc-extinguishing chamber

Abstract

The utility model provides a vacuum arc-extinguishing chamber housing assembly and a vacuum arc-extinguishing chamber, the vacuum arc-extinguishing chamber housing assembly comprises an insulation housing and a shielding cylinder arranged in the insulation housing, the inner wall of the insulation housing is provided with an annular boss in a protruding manner, and the boss is provided with an upper inclined surface, a lower inclined surface and a guide transition surface located between the upper inclined surface and the lower inclined surface; the shielding cylinder is provided with an upper-end inclined lapping surface, a middle-section connecting part and a lower-end limiting part, the upper-end inclined lapping surface of the shielding cylinder is lapped on the upper inclined surface of the boss, the middle-section connecting part corresponds to the guide transition surface, and the lower-end limiting part is a plurality of positioning convex bracts distributed on the periphery of the shielding cylinder; the plurality of positioning convex bracts abut against the lower inclined surface of the boss and are in interference fit with the lower inclined surface of the boss; therefore, the shielding cylinder is fixedly assembled in the insulating shell, the breakdown risk of the shell is effectively reduced, and the pressure resistance of a product is improved.

Description

Technical Field

[0001] The utility model relates to the field of vacuum interrupter chambers, in particular to a shell component of a vacuum interrupter chamber and the vacuum interrupter chamber. Background Art

[0002] In the prior art, there are two ways to fix the shielding tube of the shell assembly of the vacuum arc chamber: welding and riveting. When the shielding tube is welded to the inner cavity step of the shell, the inner cavity step of the shell needs to be coated with metallization, which is not only complicated in process, but also the metallization of the inner cavity step of the shell generates a concentrated electric field close to the inner wall of the shell, which is easy to discharge and cause the shell to break down, which is a fatal problem of arc chamber failure; the riveting process of fixing the shielding tube often produces a tip close to the inner cavity of the shell, which also produces a strong electric field concentration and causes the porcelain shell to break down.

[0003] Therefore, in order to reduce the risk of shell breakdown and improve the product's pressure resistance, it is necessary to design a new type of vacuum interrupter shell assembly. Utility Model Content

[0004] Therefore, in order to solve the above problems, the utility model provides a housing assembly of a vacuum interrupter and a vacuum interrupter.

[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0006] A shell assembly of a vacuum arc extinguishing chamber comprises an insulating shell and a shielding cylinder arranged in the insulating shell, the inner wall of the insulating shell protrudes with an annular boss, the boss has an upper inclined surface, a lower inclined surface and a guide transition surface located between the upper inclined surface and the lower inclined surface; the shielding cylinder has an upper end oblique surface, a middle section connecting portion and a lower end limiting portion, the upper end oblique surface of the shielding cylinder overlaps the upper inclined surface of the boss, the middle section connecting portion corresponds to the guide transition surface, and the lower end limiting portion is a plurality of positioning convex buds distributed on the outer periphery of the shielding cylinder, and the plurality of positioning convex buds all abut against the lower inclined surface of the boss to form an interference fit.

[0007] Furthermore, a plurality of positioning convex bumps are evenly distributed along the outer circumference of the shielding tube.

[0008] Furthermore, the positioning convex bump is formed by integrally stamping the shielding tube.

[0009] Furthermore, the guiding transition surface of the boss is a vertical cylindrical surface.

[0010] Furthermore, there is a certain distance between the middle connecting portion and the guide transition surface.

[0011] Furthermore, the middle section connecting portion is a vertical cylindrical section.

[0012] Furthermore, the boss has an upper inclined surface with an inclination greater than that of the lower inclined surface.

[0013] Furthermore, the inclination of the upper oblique surface of the shielding tube is the same as the inclination of the upper inclined surface of the boss, so that the upper oblique surface and the upper inclined surface form a surface-to-surface contact overlap.

[0014] Furthermore, the insulating shell is a porcelain shell.

[0015] A vacuum interrupter comprises a shell assembly and a moving contact and a stationary contact arranged in the shell assembly, wherein the moving contact and the stationary contact are located in a shielding cylinder, wherein the shell assembly is the shell assembly of the vacuum interrupter described above.

[0016] The technical solution provided by the utility model has the following beneficial effects:

[0017] The insulating shell and the shielding tube are assembled in such a way that the upper oblique surface is overlapped on the upper inclined surface of the boss, the middle connecting part corresponds to the guide transition surface, and the multiple positioning bulges of the lower end limiting part are all abutted on the lower inclined surface of the boss to form an interference fit. There is no need to adopt welding and riveting fixation in the prior art, and the shielding tube can be tightly fitted in the insulating shell, which effectively reduces the risk of shell (i.e. insulating shell) breakdown and improves the product's pressure resistance performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a cross-sectional view of a housing assembly of a vacuum interrupter in an embodiment;

[0019] Figure 2 Shown Figure 1 A magnified schematic diagram of the middle A area;

[0020] Figure 3 Shown is a cross-sectional view of a vacuum interrupter in an embodiment. DETAILED DESCRIPTION

[0021] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0022] In the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0023] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0024] Reference Figure 1 , Figure 2 As shown, the present embodiment provides a housing assembly of a vacuum arc extinguishing chamber, comprising an insulating housing 10 and a shielding tube 20 arranged in the insulating housing 10. Specifically, the insulating housing 10 is a porcelain shell, and an inner wall 11 of the insulating housing 10 protrudes with an annular boss 12, and the boss 12 has an upper inclined surface 121, a lower inclined surface 123 and a guide transition surface 122 located between the upper inclined surface 121 and the lower inclined surface 123.

[0025] The shielding tube 20 has an upper beveled surface 21, a middle connecting portion 22 and a lower limiting portion 23. The upper beveled surface 21 of the shielding tube 20 overlaps the upper beveled surface 121 of the boss 12. With such a configuration, when the upper beveled surface 21 overlaps the upper beveled surface 121 of the boss 12, the shielding tube 20 can achieve the purpose of self-positioning, and ensure the coaxiality of the shielding tube 20 and the inner cavity of the insulating shell 10. Preferably, the inclination of the upper beveled surface 21 of the shielding tube 20 is the same as the inclination of the upper beveled surface 121 of the boss 12, so that the upper beveled surface 21 and the upper beveled surface 121 form a surface-to-surface contact overlap; in this way, the effective matching area can be increased. Of course, the inclinations of the upper beveled surface 21 and the upper beveled surface 121 may also be different, as long as the upper beveled surface 21 can overlap the upper beveled surface 121 of the boss 12 to achieve self-positioning.

[0026] At the same time, with the setting of the upper inclined surface 121, the shielding tube 20 extends radially outward through the inclined edge and adheres to the inner wall 11 of the insulating shell 10. In this way, the contacts (the moving contact 31 and the static contact 32 described below) are assembled inside the shielding tube 20, which can increase the gap between the contacts and the shielding tube 20, and further improve the ability of the miniaturized arc extinguishing chamber to interrupt large currents.

[0027] The middle connecting portion 22 corresponds to the guide transition surface 122, and the lower end limiting portion 23 is a plurality of positioning convex buds 231 distributed on the outer periphery of the shielding tube 20, and the plurality of positioning convex buds 231 are all in contact with the lower inclined surface 123 of the boss 12 and form an interference fit, so as to realize the limiting fixation of the shielding tube 20 in the vertical direction and the circumferential direction.

[0028] By adopting the above-mentioned assembly method, the insulating shell 10 and the shielding tube 20 can be stably assembled without the need for welding and riveting fixation in the prior art, thereby effectively reducing the risk of shell (ie, insulating shell 10) breakdown and improving the product's pressure resistance performance.

[0029] Specifically, the guide transition surface 122 mainly plays a guiding role, that is, during the assembly process of the shielding tube 20 from top to bottom, the guide transition surface 122 effectively ensures that the shielding tube 20 is not skewed in the insulating shell 10, thereby achieving stable and accurate assembly.

[0030] Specifically, in the present embodiment, the guide transition surface 122 is preferably a vertical cylindrical surface, which is parallel to the inner wall 11 of the insulating shell 10. The vertical cylindrical surface is easy to process, and can continuously guide and position the lower end limit portion 23, thereby further ensuring the coaxiality of the shielding tube 20. Of course, in other embodiments, the guide transition surface 122 may also adopt other shapes such as inclined surfaces or curved surfaces, as long as it can serve as an assembly guide and ensure that the shielding tube 20 is not skewed in the insulating shell 10.

[0031] The middle section connecting portion 22 and the guide transition surface 122 have a certain distance therebetween, so that the middle section connecting portion 22 does not interfere with the guide transition surface 122 .

[0032] Specifically, in this embodiment, the positioning convex buds 231 are formed by integrally stamping the shielding tube 20, and are easy to prepare; specifically, the shielding tube 20 is inserted into the insulating shell 10 and then integrally stamped. The number of the positioning convex buds 231 is six, and the six positioning convex buds 231 are evenly distributed along the outer circumference of the shielding tube 20. Such an arrangement makes the force more uniform. Of course, in other embodiments, the formation method, number and distribution method of the positioning convex buds 231 are not limited to this.

[0033] Furthermore, the boss 12 has an upper slope 121 with a slope greater than the slope of the lower slope 123, which refers to the inclination compared to the inner wall 11 of the insulating shell 10, and the inner wall 11 of the insulating shell 10 is a vertical inner wall, such as Figure 2As shown, the inclination of the upper inclined surface 121 of the boss 12 is greater than the inclination of the lower inclined surface 123, which means that the angle a between the upper inclined surface 121 and the inner wall 11 of the insulating shell 10 is greater than the angle b between the lower inclined surface 123 and the inner wall 11 of the insulating shell 10. The greater the inclination, the greater the change in the position of the shielding tube 20 in the inner cavity; the end of the positioning convex bulge 231 is an arc-shaped structure. Since the inclination of the lower inclined surface 123 is small, the horizontal displacement of the convex bulge 231 is small, and the deformation of the convex bulge 231 is relatively small. Therefore, the convex bulge 231 can be punched with a smaller punching force, further reducing the damage caused by the punching force to the inner wall of the boss 12 corresponding to the convex bulge 231, and improving the pressure resistance of the insulating shell 10. In addition, the small inclination of the lower inclined surface 123 can provide the convex bulge 231 with a larger deformation range in the vertical direction, that is, to provide a margin for the positioning convex bulge 231 to press on the lower inclined surface 123. The lower slope 123 of the boss 12 is used to prevent the convex 231 from directly pressing on the inner wall 11 of the insulating shell, thereby increasing the breakdown thickness of the insulating shell at the position corresponding to the convex 231, improving the pressure resistance performance at this position, and reducing the breakdown risk.

[0034] For further information, please refer to Figure 3 As shown, this embodiment also provides a vacuum arc chamber, including a shell assembly and a moving contact 31 and a stationary contact 32 arranged in the shell assembly, wherein the moving contact 31 and the stationary contact 32 are located in the shielding tube 20, wherein the shell assembly is the shell assembly of the vacuum arc chamber described above.

[0035] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A housing assembly of a vacuum interrupter, comprising an insulating housing and a shielding cylinder arranged in the insulating housing, characterized in that: The inner wall of the insulating shell is raised with an annular boss, and the boss has an upper inclined surface, a lower inclined surface and a guide transition surface located between the upper inclined surface and the lower inclined surface; the shielding tube has an upper end bevel surface, a middle section connecting portion and a lower end limiting portion, the upper end bevel surface of the shielding tube overlaps the upper inclined surface of the boss, the middle section connecting portion corresponds to the guide transition surface, and the lower end limiting portion is a plurality of positioning convex buds distributed on the outer periphery of the shielding tube, and the plurality of positioning convex buds all abut against the lower inclined surface of the boss to form an interference fit.

2. The housing assembly of the vacuum interrupter according to claim 1, characterized in that: A plurality of positioning convex buds are evenly distributed along the outer circumference of the shielding tube.

3. The housing assembly of the vacuum interrupter according to claim 1 or 2, characterized in that: The positioning convex bump is integrally punched from the shielding tube.

4. The housing assembly of the vacuum interrupter according to claim 1, characterized in that: The guiding transition surface of the boss is a vertical cylindrical surface.

5. The housing assembly of the vacuum interrupter according to claim 1 or 4, characterized in that: The middle section connecting portion and the guide transition surface have a certain distance.

6. The housing assembly of the vacuum interrupter according to claim 5, characterized in that: The middle section connecting portion is a vertical cylindrical section.

7. The housing assembly of the vacuum interrupter according to claim 1, characterized in that: The boss has an upper inclined surface with a greater inclination than the lower inclined surface.

8. The housing assembly of the vacuum interrupter according to claim 1 or 7, characterized in that: The inclination of the upper oblique surface of the shielding tube is the same as the inclination of the upper inclined surface of the boss, so that the upper oblique surface and the upper inclined surface form a surface-to-surface contact overlap.

9. The housing assembly of the vacuum interrupter according to claim 1, characterized in that: The insulating shell is a porcelain shell.

10. A vacuum interrupter, comprising a housing assembly and a moving contact and a stationary contact arranged in the housing assembly, wherein the moving contact and the stationary contact are located in a shielding cylinder, characterized in that: The shell assembly is the shell assembly of the vacuum interrupter chamber according to any one of claims 1 to 9.

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