Main shielding case of vacuum arc-extinguishing chamber

Abstract

The utility model discloses a main shielding case of a vacuum arc-extinguishing chamber, which comprises an insulating shell, a shielding case body is arranged in the insulating shell, elastic plates distributed in a central symmetry manner are integrally formed on the outer wall of the bottom of the shielding case body, clamping teeth are integrally formed on the outer wall of one side of the bottom of each elastic plate, and a fixing ring is fixed in the insulating shell. A clamping groove is formed in the inner wall of the fixing ring, the clamping teeth are matched with the clamping groove, and a baffle ring is integrally formed on the inner wall of the fixing ring and located at the bottom of the elastic plate. According to the utility model, the fixing ring is fixed inside the insulating shell, and then the clamping teeth on the shielding cover body and the clamping grooves inside the fixing ring can be clamped and fixed, so that the shielding cover body and the insulating shell are more convenient to assemble, and the production efficiency of the vacuum arc-extinguishing chamber is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum interrupters, and particularly relates to a main shielding cover of a vacuum interrupter. Background Art

[0002] A vacuum interrupter, also known as a vacuum switch tube, is a core component of medium and high voltage power switches. Its main function is to quickly extinguish the arc and suppress the current after the medium and high voltage circuit cuts off the power through the excellent insulation of the vacuum inside the tube, avoiding accidents and unexpected situations.

[0003] Chinese Patent Application No. CN202022746007.1 relates to a vacuum interrupter and a main shielding cover of a vacuum interrupter. The vacuum interrupter includes: an outer shell that is axially butted along the vacuum interrupter to enclose a vacuum chamber; a metal middle sealing ring that is welded and fixed between two sections of the outer shell, and a main shielding cover is fixed thereon; a moving contact and a static contact for realizing the opening and closing of the vacuum interrupter.

[0004] The vacuum interrupter includes an insulating outer shell, and a main shielding cover is provided inside the insulating outer shell. Currently, the main shielding cover of the vacuum interrupter is fixed to the insulating outer shell by welding. However, the gap between the insulating outer shell and the main shielding cover is relatively narrow, making it difficult to operate during welding, resulting in a decrease in the production efficiency of the vacuum interrupter. Therefore, it is urgent to design a main shielding cover of a vacuum interrupter to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a main shielding cover of a vacuum interrupter to solve the above deficiencies in the prior art.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A main shielding cover of a vacuum interrupter includes an insulating outer shell. A shielding cover body is arranged inside the insulating outer shell. Elastic plates are integrally formed on the bottom outer wall of the shielding cover body and are symmetrically distributed around the center. A clamping tooth is integrally formed on one side outer wall of the bottom of the elastic plate. A fixing ring is fixed inside the insulating outer shell. A clamping groove is arranged on the inner wall of the fixing ring. The clamping tooth is adapted to the clamping groove. A retaining ring is integrally formed on the inner wall of the fixing ring, and the retaining ring is located at the bottom of the elastic plate.

[0008] Further, a conical surface is arranged on the inner wall of the fixing ring, and the conical surface is adapted to the clamping tooth.

[0009] Further, a connecting ring is integrally formed on the outer wall of the fixing ring, and the connecting ring is embedded inside the insulating outer shell.

[0010] Further, an upper shrinkage opening is arranged at the top of the shielding cover body, and a lower shrinkage opening is arranged at the bottom of the shielding cover body.

[0011] Further, the shielding cover body includes a shielding layer, an insulating layer is provided on the inner wall of the shielding layer, and a heat-conducting layer is provided between the shielding layer and the insulating housing.

[0012] Further, a static end sealing cover is fixed at the bottom of the insulating housing, a static conductive rod is welded in the middle of the static end sealing cover, and a static contact is fixed at the top end of the static conductive rod.

[0013] Further, a moving end sealing cover is fixed at the top of the insulating housing, a bellows is fixed on the inner wall of the top of the moving end sealing cover, a moving conductive rod is inserted into the bellows, a moving contact is fixed at the bottom end of the moving conductive rod, the bottom end of the bellows is fixed to the moving conductive rod, and the bottom of the moving contact contacts the static contact.

[0014] In the above technical solution, for a main shielding cover of a vacuum interrupter provided by the present utility model, the beneficial effects are as follows: The fixing ring is fixed inside the insulating housing, and then the engaging teeth on the shielding cover body can be engaged and fixed with the card slots inside the fixing ring, thereby making it more convenient to assemble the shielding cover body with the insulating housing, and thus improving the production efficiency of the vacuum interrupter; An insulating layer is provided on the inner wall of the shielding cover body to prevent the shielding layer from generating metal vapor under the action of an arc, and a good heat-conducting channel can be formed between the shielding cover body and the insulating housing through the heat-conducting layer, so that the heat on the shielding cover body can be efficiently conducted to the insulating housing for dissipation; The conical surface provided enables the engaging teeth to smoothly enter the inside of the fixing ring, and the retaining ring can block the bottom end of the elastic plate, so that the shielding cover body is limited in the vertical direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure provided for an embodiment of the main shielding cover of a vacuum interrupter of the present utility model.

[0017] Figure 2 It is a schematic diagram of the internal structure provided for an embodiment of the main shielding cover of a vacuum interrupter of the present utility model.

[0018] Figure 3 It is a schematic diagram of the enlarged structure at A provided for an embodiment of the main shielding cover of a vacuum interrupter of the present utility model.

[0019] Figure 4 Schematic diagram of the shielding cover body structure provided for an embodiment of the main shielding cover of a vacuum interrupter of the present utility model.

[0020] Explanation of reference numerals:

[0021] 1 Insulating housing, 2 Shielding cover body, 3 Upper contraction opening, 4 Lower contraction opening, 5 Fixed ring, 6 Spring plate, 7 Locking tooth, 8 Card slot, 9 Retaining ring, 10 Connecting ring, 11 Tapered surface, 12 Shielding layer, 13 Insulating layer, 14 Heat-conducting layer, 15 Moving-end sealing cover, 16 Bellows, 17 Moving conductive rod, 18 Moving contact, 19 Static-end sealing cover, 20 Static conductive rod, 21 Static contact. Specific embodiments

[0022] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0023] As Figures 1-4 shown, a main shielding cover of a vacuum interrupter provided by an embodiment of the present utility model includes an insulating housing 1. Inside the insulating housing 1, there is a shielding cover body 2. On the bottom outer wall of the shielding cover body 2, spring plates 6 are integrally formed and distributed symmetrically about the center. On the bottom outer wall of one side of the spring plate 6, a locking tooth 7 is integrally formed. A fixed ring 5 is fixed inside the insulating housing 1. On the inner wall of the fixed ring 5, there is a card slot 8. The locking tooth 7 is adapted to the card slot 8. On the inner wall of the fixed ring 5, a retaining ring 9 is integrally formed. The retaining ring 9 is located at the bottom of the spring plate 6.

[0024] Specifically, in this embodiment, it includes an insulating housing 1. The insulating housing 1 is made of glass material. Inside the insulating housing 1, there is a shielding cover body 2. The shielding cover body 2 can prevent a large amount of metal vapor and metal droplets from splashing during the arcing process of the contact, prevent pollution of the inner wall of the insulating housing, and avoid a decrease in the insulation strength of the outer shell of the vacuum interrupter or the occurrence of flashover; improve the electric field distribution inside the vacuum interrupter; absorb part of the arc energy and condense the arc products. On the bottom outer wall of the shielding cover body 2, spring plates 6 are integrally formed and distributed symmetrically about the center. On the bottom outer wall of one side of the spring plate 6, a locking tooth 7 is integrally formed. A fixed ring 5 is fixed inside the insulating housing 1. On the inner wall of the fixed ring 5, there is a card slot 8. The locking tooth 7 is adapted to the card slot 8. When the locking tooth 7 is engaged with the card slot 8, the shielding cover body 2 can be conveniently fixed inside the insulating housing 1. On the inner wall of the fixed ring 5, a retaining ring 9 is integrally formed. The retaining ring 9 is located at the bottom of the spring plate 6. The retaining ring 9 can block the bottom end of the spring plate 6, so that the shielding cover body 2 is limited in the vertical direction.

[0025] The main shielding cover of a vacuum interrupter provided by the present utility model fixes the fixing ring 5 inside the insulating housing 1, and then the engaging teeth 7 on the shielding cover body 2 can be engaged and fixed with the card slots 8 inside the fixing ring 5, thereby making it more convenient to assemble the shielding cover body 2 with the insulating housing 1, and thus improving the production efficiency of the vacuum interrupter.

[0026] In another embodiment provided by the present utility model, a tapered surface 11 is provided on the inner wall of the fixing ring 5, and the tapered surface 11 is adapted to the engaging teeth 7. By providing the tapered surface 11, the engaging teeth 7 can smoothly enter the inside of the fixing ring 5; a connecting ring 10 is integrally formed on the outer wall of the fixing ring 5, and the connecting ring 10 is embedded inside the insulating housing 1. When the insulating housing 1 is formed, the fixing ring 5 is fixed inside the forming die of the insulating housing 1, so that the insulating housing 1 can be fixed to the fixing ring 5 after cooling; an upper shrinkage opening 3 is provided at the top of the shielding cover body 2, and a lower shrinkage opening 4 is provided at the bottom of the shielding cover body 2. The upper shrinkage opening 3 and the lower shrinkage opening 4 can effectively block the metal spatter generated inside the shielding cover body 2.

[0027] In another embodiment provided by the present utility model, the shielding cover body 2 includes a shielding layer 12, the shielding layer 12 is made of stainless steel, an insulating layer 13 is provided on the inner wall of the shielding layer 12, the insulating layer 13 is a ceramic coating, and the insulating layer 13 prevents the shielding layer 12 from generating metal vapor under the action of an electric arc. A heat-conducting layer 14 is provided between the shielding layer 12 and the insulating housing 1. In the prior art, there is a gap between the shielding cover body 2 and the insulating housing 1, so that the contact between the shielding cover body 2 and the insulating housing 1 is not good enough. Through the close contact of the heat-conducting layer 14 with the insulating housing 1 and the shielding cover body 2, a good heat-conducting channel can be formed between the shielding cover body 2 and the insulating housing 1, and thus the heat on the shielding cover body 2 can be efficiently conducted to the insulating housing 1 to dissipate; a static end sealing cover 19 is fixed at the bottom of the insulating housing 1, and the static end sealing cover 19 seals the bottom of the insulating housing 1. A static conducting rod 20 is welded in the middle of the static end sealing cover 19, and a static contact 21 is fixed at the top of the static conducting rod 20; a moving end sealing cover 15 is fixed at the top of the insulating housing 1, the moving end sealing cover 15 seals the top of the insulating housing 1, a bellows 16 is fixed on the inner wall of the top of the moving end sealing cover 15, the top of the bellows 16 is hermetically welded to the moving end sealing cover 15, a moving conducting rod 17 is inserted inside the bellows 16, a moving contact 18 is fixed at the bottom of the moving conducting rod 17, the bottom end of the bellows 16 is fixed to the moving conducting rod 17, and the bottom end of the bellows 16 is hermetically welded to the moving conducting rod 17. At the same time, the inside of the insulating housing 1 is in a vacuum state, and the bottom of the moving contact 18 contacts the static contact 21, and when the moving contact 18 contacts the static contact 21, the moving conducting rod 17 and the static conducting rod 20 are electrically conducted.

[0028] Working principle: When it is necessary to fix the shielding cover body 2 inside the insulating housing 1, the shielding cover body 2 is placed into the inside of the insulating housing 1 from the top of the fixing ring 5, and then the shielding cover body 2 is squeezed towards the fixing ring 5, so that the locking teeth 7 on the elastic plate 6 enter into the card slots 8 of the fixing ring 5, thereby fixing the shielding cover body 2 inside the insulating housing 1. Then, components such as the moving end sealing cover 15, the corrugated pipe 16, the moving conductive rod 17, the moving contact 18 and the static end sealing cover 19 can be normally assembled with the insulating housing 1.

[0029] Only some exemplary embodiments of the present utility model are described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present utility model. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present utility model.

Claims

1. A main shielding cover of a vacuum interrupter, characterized in that: The invention comprises an insulating shell (1), wherein a shielding cover body (2) is arranged inside the insulating shell (1), a spring plate (6) which is centrally symmetrically distributed is integrally formed on the bottom outer wall of the shielding cover body (2), a latching tooth (7) is integrally formed on the bottom side outer wall of the spring plate (6), a fixing ring (5) is fixed inside the insulating shell (1), a latching groove (8) is arranged on the inner wall of the fixing ring (5), the latching tooth (7) is matched with the latching groove (8), a retaining ring (9) is integrally formed on the inner wall of the fixing ring (5), and the retaining ring (9) is located at the bottom of the spring plate (6).

2. The main shielding cover of a vacuum interrupter according to claim 1, characterized in that: The inner wall of the fixing ring (5) is provided with a conical surface (11), and the conical surface (11) is matched with the latching teeth (7).

3. The main shielding cover of a vacuum interrupter according to claim 1, characterized in that: A connecting ring (10) is integrally formed on the outer wall of the fixing ring (5), and the connecting ring (10) is embedded in the interior of the insulating housing (1).

4. The main shielding cover of a vacuum interrupter according to claim 1, characterized in that: An upper shrinkage opening (3) is provided at the top of the shielding cover body (2), and a lower shrinkage opening (4) is provided at the bottom of the shielding cover body (2).

5. The main shielding cover of a vacuum interrupter according to claim 1, characterized in that: The shielding cover body (2) comprises a shielding layer (12), an inner wall of the shielding layer (12) is provided with an insulating layer (13), and a heat conducting layer (14) is provided between the shielding layer (12) and the insulating shell (1).

6. The main shielding cover of a vacuum interrupter according to claim 1, characterized in that: A static end sealing cover (19) is fixed to the bottom of the insulating housing (1), a static conductive rod (20) is welded to the middle of the static end sealing cover (19), and a static contact (21) is fixed to the top of the static conductive rod (20).

7. The main shielding cover of a vacuum interrupter according to claim 6, characterized in that: A moving end sealing cover (15) is fixed to the top of the insulating housing (1), a bellows (16) is fixed to the inner wall of the top of the moving end sealing cover (15), a moving conductive rod (17) is inserted into the interior of the bellows (16), a moving contact (18) is fixed to the bottom end of the moving conductive rod (17), the bottom end of the bellows (16) is fixed to the moving conductive rod (17), and the bottom of the moving contact (18) is in contact with the stationary contact (21).

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