Vacuum circuit breaker shell

Abstract

According to the technical scheme, the vacuum circuit breaker shell is characterized in that the vacuum circuit breaker shell comprises a bottom shell, a frame body and a cover plate, the frame body is of a cylindrical structure and comprises a U-shaped left side plate and a U-shaped right side plate, the inner walls of the bottoms of the left side plate and the right side plate are attached to the peripheral side of the bottom shell and connected with the peripheral side of the bottom shell in a welded mode, and the connecting positions of the left side plate and the right side plate are a connecting section A and a connecting section B respectively; the connecting section A extends towards one end of the right side plate to form a bending plate capable of elastically deforming, the bending plate obliquely extends from the outer side of the left side plate to the inner wall, one end, far away from the left side plate, of the bending plate extends towards the right side plate to form a sealing plate, and the sealing plate is attached to and welded to the inner wall of the connecting section B of the right side plate; the frame body is divided into the left side plate and the right side plate which are spliced with each other, the left side plate, the right side plate and the connecting holes and the mounting holes above the left side plate and the right side plate can be integrally poured and formed through a common mold, the mold is not needed, the structure is complex, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum circuit breakers, and particularly relates to a vacuum circuit breaker housing. Background Art

[0002] At present, outdoor vacuum circuit breakers are used more and more widely in the distribution network, and have the advantages of small volume, light weight, being suitable for frequent operation, and no need for overhaul for arc extinguishing. The housing of the current outdoor high-voltage vacuum circuit breaker is composed of a bottom plate, side plates and an upper cover plate. Through holes for incoming line terminals and outgoing line terminals to pass through are arranged on the upper cover plate, and mounting holes for connecting external devices to the circuit breaker body, as well as various operation holes and connection holes, are arranged on the peripheral side of the side plates. Most of the existing circuit breakers have a relatively single shape, and are all structured in a rectangle or the like. At the same time, in order to ensure the sealing effect, the side plates are all integrally formed by die casting or casting. For various connection holes and operation holes on the side plates, they are directly formed during casting or drilled above them after casting.

[0003] In order to reduce the weight or volume to adapt to a specific space environment, various customized special-shaped vacuum circuit breaker housings have also appeared on the market at present. However, such special-shaped vacuum circuit breakers generally have a small output and the outer shell shape is irregular. If the integral forming by casting is adopted, it will be more troublesome. At the same time, it is difficult for workers to ensure the accurate position of the holes when drilling on the surface of the irregular outer shell, which is likely to affect the subsequent installation of the circuit breaker body. If die casting is adopted, since the side plate is an integrally formed cylindrical structure and holes need to be formed at corresponding positions above it, a mechanical linkage structure is required for the die to realize the forming of all holes, which will lead to a more complex structure and high cost of the die, greatly increasing the production cost. Content of the Utility Model

[0004] The utility model provides a vacuum circuit breaker housing. By dividing the frame into two left and right side plates that are spliced with each other, the left and right side plates and the connection holes and mounting holes above them can be integrally formed by a common die, so that the structure of the die for production is not too complex, and the production cost is reduced.

[0005] To achieve the above object, the technical solution adopted by the present utility model is as follows: A vacuum circuit breaker housing, comprising a bottom case, a frame body and a cover plate. The frame body has a cylindrical structure and includes a left side plate and a right side plate in a U shape. Mounting holes and connection holes are provided on the left and right side plates. The inner walls of the bottoms of the left and right side plates are in contact with the periphery of the bottom case and are welded. The connection parts of the left and right side plates are connection section A and connection section B respectively. An elastically deformable bent plate is formed by extending from one end of connection section A towards the right side plate. The bent plate extends obliquely from the outside of the left side plate towards the inner wall. A sealing plate is provided at the end of the bent plate away from the left side plate and extends towards the right side plate. The sealing plate is in contact with the inner wall of connection section B of the right side plate and is welded.

[0006] The present utility model is further provided that a connecting plate extends upwards from the edge of the bottom case. The inner walls of the bottoms of the left and right side plates are in contact with the outer wall of the connecting plate and are welded.

[0007] The present utility model is further provided that a flange is formed by extending outwards from one side edge of the cover plate relative to the frame body. A connection plate corresponding to the position of the flange is welded at one end edge of the frame body relative to the cover plate. The connection plate and the flange are connected to each other by bolts.

[0008] The present utility model is further provided that an L-shaped clamping strip is provided on the inner wall of connection section B. A sealing groove with an opening facing the sealing plate and in plug-in fit with the sealing plate is formed between the clamping strip and the inner wall of the connection section. The sealing groove is in abutting fit with the end of the sealing plate.

[0009] The present utility model is further provided that one end of the sealing plate located in the sealing groove has a tapered cross-section. An abutting block for abutting against the end of the sealing plate is provided at the bottom of the sealing groove.

[0010] The present utility model is further provided that a supporting edge extends outwards from the periphery of the connecting plate. The supporting edge abuts against the bottom of the frame body.

[0011] The present utility model is further provided that limiting blocks extend upwards from both sides of the supporting edge relative to the left and right side plates. Limiting heads for abutting against the outer walls of the left and right side plates are provided on the limiting blocks. The limiting heads are used to limit the horizontal movement of the left and right side plates away from the bottom case. A guiding inclined surface is provided on the side of the limiting head away from the bottom case.

[0012] The present utility model is further provided that a support bar and a fixing foot are welded on the outer side surface of the bottom of the bottom case.

[0013] In summary, the beneficial effects of the present utility model are as follows:

[0014] Compared with the prior art, in this application, the whole housing is made of stainless steel, and the frame is divided into two left and right side plates that are spliced with each other. By splicing the left and right side plates and then welding the connection parts, a cylindrical frame can be formed to realize the connection with the bottom shell. The split setting of the left and right side plates with connection holes and mounting holes enables users to produce the special-shaped frame without customizing molds with relatively complex structures. The casting production of the left and right side plates can be achieved through ordinary punch and die, greatly reducing the cost of molds in the production process, and being more suitable for the production of special-shaped vacuum circuit breaker housings in small batches.

[0015] At the same time, through the connection segments A and B provided at the connection of the left and right side plates, the bending plate and the sealing plate extending from the connection segment A to the connection segment B, the sealing plate can be inserted between the two connection segments B through the bending plate, which is convenient for welding operations after the left and right side plates are spliced through the connection segments. The bending plate has a certain elasticity, and can drive the sealing plates at both ends to approach each other elastically deformed after being pressurized, enabling the sealing plate to smoothly insert between the two connection segments B. Then, after the splicing is completed, the bending plate can drive the sealing plate to reset outward, so that the sealing plate can closely fit on the inner wall of the connection segment B, improving the sealing effect after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the three-dimensional structure diagram of this embodiment.

[0017] Figure 2 is the exploded view of this embodiment.

[0018] Figure 3 is the structural schematic diagram of the frame.

[0019] Figure 4 is Figure 3 the enlarged view of part A.

[0020] Figure 5 is Figure 3 the enlarged structural view of the bottom shell at part B.

[0021] Figure 6 is Figure 1 the enlarged view of the limit block at part C.

[0022] Reference numerals: 1, bottom shell; 11, connecting plate; 12, supporting edge; 13, limit block; 14, limit head; 15, guiding inclined surface; 2, frame; 21, left side plate; 211, connection segment A; 212, bending plate; 213, sealing plate; 22, right side plate; 221, connection segment B; 222, clamping strip; 223, sealing groove; 224, abutting block; 3, cover plate; 4, flange; 5, connection disk; 6, support bar; 7, fixed foot; 8, through hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of the present utility model.

[0024] As Figures 1-6 shown, this embodiment discloses a vacuum circuit breaker housing, which is made of stainless steel material and includes a bottom case 1, a frame body 2 and a cover plate 3. The bottom case 1 and the frame body 2 are connected by welding, and the cover plate 3 and the frame body 2 are fixedly connected by bolts. A through hole 8 is provided on the cover plate 3, and the through hole 8 can expose the incoming line terminal and the outgoing line terminal of the circuit breaker body to the outside.

[0025] Embodiment 1

[0026] As Figures 1-2 shown, the frame body 2 has a cylindrical structure and is composed of a U-shaped left side plate 21 and a right side plate 22 spliced together. Various connection holes and operation holes are provided on both the left side plate 21 and the right side plate 22, which can be used for the circuit breaker body to be connected to the external operating mechanism; the bottom inner walls of the left side plate 21 and the right side plate 22 are mutually attached to the peripheral outer wall of the bottom case 1. During assembly, the left side plate 21 and the right side plate 22 are respectively fixed to the bottom case 1 by welding, and the connection part is also sealed by welding.

[0027] As Figure 2 shown, a flange 4 extends outward from one side edge of the cover plate 3 relative to the frame body 2. A connection plate 5 corresponding to the position of the flange 4 is welded to one end edge of the frame body 2 relative to the cover plate 3. The connection plate 5 and the flange 4 are connected to each other by bolts; the connection plate 5 can be composed of multiple connection bars. During installation, the processed connection bars can be successively welded to the top of the frame body 2 assembled by the left and right side plates to form a connection plate 5 corresponding to the position and shape of the flange 4, and then the flange 4 and the connection plate 5 can be fixed by bolts to realize the fixed connection between the cover plate 3 and the frame body 2.

[0028] As Figures 2-3As shown in the figure, the connection parts of the left side plate 21 and the right side plate 22 are respectively provided with a connection section A211 and a connection section B221. The connection section A211 extends towards one end of the right side plate 22 to form an elastically deformable bent plate 212. The bent plate 212 extends obliquely from the outside of the left side plate 21 towards the inner wall. One end of the bent plate 212 away from the left side plate 21 extends towards the right side plate 22 and is provided with a sealing plate 213. The sealing plate 213 is connected to the inner wall of the connection section B221 of the right side plate 22 by welding. During assembly, the connection section A211 of the left side plate 21 is aligned with the connection section B221 of the right side plate 22, and then they are brought closer to each other, so that the sealing plate 213 is inserted between the two connection sections B221, so that the outer wall of the sealing plate 213 is in mutual contact with the inner wall of the right side plate 22, completing the splicing of the frame body 2, and then welding the connection part of the connection section A211 and the connection section B221 can realize the fixation between the left and right side plates. During the assembly process of the left and right side plates, it is necessary to ensure that the relative positions of the two with respect to the bottom case 1 are accurate. The bent plate 212 between the sealing plate 213 and the connection section A211 can make the sealing plate 213 elastically deformable relative to the connection section A211, so as to facilitate the smooth insertion of the sealing plate 213 between the right side plates 22. At the same time, after the sealing plate 213 is inserted into the right side plate 22, the bent plate 212 can elastically reset to drive the outer walls of the sealing plates 213 at both ends to be in close contact with the inner wall of the connection section B221, improving the sealing effect.

[0029] After the left and right side plates are assembled and spliced, a certain gap will be formed between the bent plate 212 and the connection section B221 of the right side plate 22. The setting of the gap enables the staff to more accurately position the welding position, thus facilitating the welding of the connection part between the two.

[0030] Embodiment 2

[0031] On the basis of Embodiment 1, as Figures 3-4 shown, the inner wall of the connection section B221 is provided with an L-shaped card strip 222. The card strip 222 is integrally formed with the right side plate 22. A sealing groove 223 with an opening facing the sealing plate 213 and in plug-in fit with the sealing plate 213 is formed between the card strip 222 and the inner wall of the connection section B221. The bottom of the sealing groove 223 is provided with an abutting block 224 that abuts against the end of the sealing plate 213. One end of the sealing plate 213 located in the sealing groove 223 is provided with a tapered cross section.

[0032] The sealing groove 223 formed by the L-shaped clamping strip 222 integrally formed with the right side plate 22 enables the sealing plate 213 on the left side plate 21 to be limited within the sealing groove 223 when the left side plate 21 and the right side plate 22 are spliced and assembled, improving the connection strength and sealing performance. One end of the sealing plate 213 facing the sealing groove 223 is tapered, and a contact block 224 abutting against the sealing plate 213 is arranged in the sealing groove 223. One end of the contact block 224 opposite to the sealing plate 213 is also tapered. When the sealing plate 213 abuts against the contact block 224, the contact block 224 can apply a force to move the sealing plate 213 towards the inner wall of the right side plate 22, thereby further improving the sealing effect between the connecting section B221 of the sealing plate 213 and the right side plate 22.

[0033] As Figure 1 、 3 As shown in FIGS. 5-6, a connecting plate 11 extends upward from the edge of the bottom case 1, and a supporting edge 12 extends outward from the periphery of the connecting plate 11, and the supporting edge 12 abuts against the bottom of the frame 2.

[0034] Through the arrangement of the supporting edge 12, the left and right side plates can be supported and positioned, thus facilitating the assembly of the frame 2 before welding.

[0035] The supporting edge extends upward on both sides relative to the left side plate 21 and the right side plate 22 to form a limiting block 13, and a limiting head 14 abutting against the outer walls of the left and right side plates is arranged on the limiting block 13. The limiting head 14 is used to limit the horizontal movement of the left and right side plates away from the bottom case 1, and a guiding inclined surface 15 is arranged on one side of the limiting head 14 away from the bottom case 1; through the limiting block 13 and the limiting head 14, after the staff assembles the left and right side plates, the limiting head 14 can limit the horizontal movement of the two side plates, playing a role in temporarily fixing the two side plates, so as to avoid the relative position of the left and right side plates moving during the subsequent processing steps and affecting the welding operation.

[0036] In this embodiment, a supporting strip 6 and a fixing foot 7 are welded to the outer side surface of the bottom of the bottom case 1.

[0037] Assembly and welding process: First, the staff can take the bottom shell 1 first, weld the support bar 6 and the fixed feet 7 to the bottom of the bottom shell 1. Then, after placing the bottom shell 1 flat on the workbench, first place the right side plate 22 on the support edge 12 of the bottom shell 1 and ensure that the inner wall of the right side plate 22 abuts against the outer wall of the connecting plate 11 to ensure the accurate position of the right side plate 22. After that, install the left side plate 21 in the same way as installing the right side plate 22. During the installation process, ensure that the sealing plate 213 of the left side plate 21 can fit with the inner wall of the right side plate 22. And during the installation of the left and right side plates, the limit blocks 13 can temporarily fix the positions of the left and right side plates to prevent the side plates from moving. After the left and right side plates are assembled, first weld the connection between the bottom shell 1 and the frame 2, then weld the connection between the left and right side plates. Finally, weld the connection disk 5 to the top of the frame 2 and then fixedly connect the cover plate 3 to the frame 2 to complete the assembly of the housing.

[0038] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the design concept of the present invention shall be included within the protection scope of the present invention.

Claims

1. A vacuum circuit breaker housing, comprising a bottom housing (1), a frame (2) and a cover plate (3), characterized in that: The frame (2) is a cylindrical structure, comprising a U-shaped left side plate (21) and a right side plate (22), the left and right side plates being provided with mounting holes and connecting holes, the bottom inner walls of the left side plate (21) and the right side plate (22) being fitted with and welded to the circumference of the bottom shell (1), the connecting parts of the left side plate (21) and the right side plate (22) being respectively a connecting section A (211) and a connecting section B (221), the connecting section A (211) extending toward one end of the right side plate (22) forming an elastically deformable bending plate (212), the bending plate (212) extending obliquely from the outer side of the left side plate (21) toward the inner wall direction, the end of the bending plate (212) away from the left side plate (21) extending toward the right side plate (22) being provided with a sealing plate (213), the sealing plate (213) being fitted with and welded to the inner wall of the connecting section B (221) of the right side plate (22).

2. A vacuum circuit breaker housing according to claim 1, characterized in that: A connecting plate (11) is provided on the edge of the bottom shell (1) extending upward, and the inner walls of the bottoms of the left side plate (21) and the right side plate (22) are fitted and welded to the outer wall of the connecting plate (11).

3. A vacuum circuit breaker housing according to claim 2, characterized in that: The cover plate (3) extends outwardly at one side edge relative to the frame body (2) to form a flange (4); the frame body (2) is welded at one end edge relative to the cover plate (3) to a connecting plate (5) corresponding to the position of the flange (4); the connecting plate (5) and the flange (4) are connected to each other via bolts.

4. A vacuum circuit breaker housing according to claim 1, characterized in that: The inner wall of the connecting section B (221) is provided with an L-shaped clamping strip (222), and a sealing groove (223) is formed between the clamping strip (222) and the inner wall of the connecting section, the sealing groove (223) opening toward the sealing plate (213) and plugging with the sealing plate (213), and the sealing groove (223) is butted against the end of the sealing plate (213).

5. A vacuum circuit breaker housing according to claim 4, characterized in that: The cross section of one end of the sealing plate (213) located in the sealing groove (223) is conical, and the bottom of the sealing groove (223) is provided with an abutment block (224) that abuts against the end of the sealing plate (213).

6. A vacuum circuit breaker housing according to claim 2, characterized in that: The connecting plate (11) is extended outwardly around a peripheral side to form a supporting edge (12), and the supporting edge (12) abuts against the bottom of the frame (2).

7. A vacuum circuit breaker housing according to claim 6, characterized in that: The support edge (12) extends upwards relative to both sides of the left plate (21) and the right plate (22) to form a limiting block (13); the limiting block (13) is provided with a limiting clamping head (14) abutting against the outer walls of the left and right plates (22); the limiting clamping head (14) is used to limit the horizontal movement of the left and right plates (22) away from the bottom shell (1); and a guiding inclined surface (15) is provided on the side of the limiting clamping head (14) away from the bottom shell (1).

8. A vacuum circuit breaker housing according to claim 1, characterized in that: The bottom outer side surface of the bottom shell (1) is welded with a support bar (6) and a fixing foot (7).

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