Vacuum circuit breaker

Abstract

The utility model discloses a vacuum circuit breaker which is large in contact surface, small in resistance value and good in stability. According to the technical scheme, the vacuum circuit breaker comprises a bracket, a vacuum arc-extinguishing chamber arranged at the upper end of the bracket, a wire inlet contact arranged at the lower end of the vacuum arc-extinguishing chamber, a wire outlet seat arranged on a lower insulating seat at the lower end of the bracket, and two blade type moving contacts rotationally arranged on the wire outlet seat, the support is provided with a square shaft corresponding to the position between the wire inlet contact and the wire outlet seat, the square shaft is provided with a crank arm driving the blade type moving contact to rotate, the inner side of the rear end of the blade type moving contact is provided with an arc-shaped convex surface, and the two sides of the wire outlet seat are provided with arc-shaped concave surfaces matched with the arc-shaped convex surface.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of power equipment, especially relates to a vacuum circuit breaker. BACKGROUND

[0002] The vacuum circuit breaker is named because its arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are both high vacuum. The structure of the vacuum circuit breaker comprises a support, a vacuum arc-extinguishing chamber installed at the upper end of the support and distributed in three phases, a line-inlet contact installed at the lower end of the vacuum arc-extinguishing chamber, a line-outlet seat installed on a lower insulating base at the lower end of the support, and two knife blade movable contacts rotatably arranged on the line-outlet seat. The support is provided with a square shaft between the line-inlet contact and the line-outlet seat, and the square shaft is provided with a crank arm for driving the rotation of the knife blade movable contacts. The conventional knife blade movable contact is connected to the line-outlet seat by a screw rod, and springs are usually arranged at both ends of the screw rod to ensure that the knife blade movable contact has elasticity and can better contact the line-inlet contact. The existing defects are: 1. The knife blade movable contact and the line-outlet seat are in plane contact, the contact area is small, the resistance is large, and the stability is poor; 2. The spring has a large volume and small elasticity. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide a vacuum circuit breaker with a large contact area, small resistance, and good stability.

[0004] To solve the above problems, the utility model adopts the technical scheme of comprising a support, a vacuum arc-extinguishing chamber installed at the upper end of the support, a line-inlet contact installed at the lower end of the vacuum arc-extinguishing chamber, a line-outlet seat installed on a lower insulating base at the lower end of the support, and two knife blade movable contacts rotatably arranged on the line-outlet seat. The support is provided with a square shaft between the line-inlet contact and the line-outlet seat, and the square shaft is provided with a crank arm for driving the rotation of the knife blade movable contacts. The characteristic of the utility model lies in that the rear end of the knife blade movable contact is provided with an arc convex surface, the two sides of the line-outlet seat are provided with arc concave surfaces corresponding to the arc convex surfaces, and the rear end of the knife blade movable contact is rotatably connected to the line-outlet seat by a bolt, and a pair of disc springs opposite to each other are arranged at both ends of the bolt.

[0005] The vacuum circuit breaker is characterized in that the rear end of the knife blade movable contact is provided with a recess, and the inner end face of the disc spring is embedded in the recess.

[0006] The vacuum circuit breaker is characterized in that the front end of the bolt is provided with a self-locking nut, the self-locking nut comprises a nut main body and a self-locking seat integrally formed at the rear end of the nut main body, and a self-locking screw abutting against the bolt is arranged in the self-locking seat.

[0007] The vacuum circuit breaker, characterized in that the front end of the blade type movable contact is also provided with the bolt, the bolt is sleeved with the washer in the middle, and a set of two opposing disc springs are arranged at both ends of the bolt.

[0008] The vacuum circuit breaker, characterized in that the lower end of the support is provided with a first support plate, and the upper end is provided with a positioning plate, the lower end of the vacuum arc-extinguishing chamber and the incoming line contact are fixed on the first support plate through a fastening nut, and the upper end of the vacuum arc-extinguishing chamber is sleeved on the positioning plate.

[0009] The vacuum circuit breaker, characterized in that the lower insulation base is connected with a second support plate through a support beam, the second support plate is connected with the grounding contact, and the grounding contacts are connected through a grounding copper pipe.

[0010] The vacuum circuit breaker, characterized in that the upper end of the grounding contact is provided with an inclined guide surface on both sides, and the lower end is provided with a positioning step.

[0011] The vacuum circuit breaker has the following advantages: 1. The blade type movable contact and the outgoing line seat are in contact with each other through an arc convex surface and an arc concave surface, the contact surface is large, the resistance value is small, and the arc convex surface and the arc concave surface have positioning function and better stability after being connected; 2. The disc spring is used as an elastic element, the volume is smaller (shorter), and the elastic force is large, so that the incoming line contact can be more closely contacted.

[0012] The utility model will be further described below in combination with the drawings of the specification. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the structure schematic diagram of the utility model vacuum circuit breaker;

[0014] Figure 2 is the connection schematic diagram between the utility model blade type movable contact and outgoing line seat;

[0015] Figure 3 is the structure schematic diagram of the utility model outgoing line seat;

[0016] Figure 4 is the structure schematic diagram of the utility model blade type movable contact;

[0017] Figure 5 is the structure schematic diagram of the utility model grounding contact. DETAILED DESCRIPTION

[0018] REFERENCE Figures 1-5The utility model discloses a vacuum circuit breaker, including support 1, install the vacuum arc-extinguishing chamber 2 of support 1 upper end, install the incoming line contact 3 of vacuum arc-extinguishing chamber 2 lower extreme, install the outgoing line seat 5 of lower insulating seat 4 on support 1 lower extreme and the two blade movable contact 6 of rotatable setting on outgoing line seat 5. Support 1 is equipped with square shaft 7 between the incoming line contact 3 and outgoing line seat 5, and the elbow arm 8 of square shaft 7 is equipped with the rotation of blade movable contact 6. The rear end inboard of blade movable contact 6 is equipped with arc convex surface 9, and the both sides of outgoing line seat 5 are equipped with arc concave surface 10 with arc convex surface 9 adaptation. The rear end of blade movable contact 6 is rotatablely connected with outgoing line seat 5 through bolt 11, and the both ends of bolt 11 are equipped with a set of two two opposite disc springs 12. The number of disc spring 12 is ideally 2-5 pairs.

[0019] Preferably, the rear end of the blade movable contact 6 is provided with a recess 13, and the inner end face of the disc spring 12 is embedded in the recess 13, so as to play a positioning role on the disc spring 12, and further improve the stability.

[0020] Preferably, the front end of the bolt 11 is provided with a self-locking nut 14, the self-locking nut 14 comprises a nut body 15 and a self-locking seat 16 integrally formed at the rear end of the nut body 15, and the self-locking seat 16 is provided with a self-tightening screw 17 abutting against the bolt 11. When the self-locking nut 14 is screwed into place, the self-tightening screw 17 is tightened to prevent loosening.

[0021] Preferably, the front end of the blade movable contact 6 is also provided with the bolt 11, the bolt 11 is sleeved with a gasket 21, and the both ends of the bolt 11 are also provided with a set of two two opposite disc springs 12. To further improve the tension of the blade movable contact 6.

[0022] Preferably, the lower end of the support 1 is provided with a first supporting plate 22, the upper end of the support 1 is provided with a positioning plate 23, the lower end of the vacuum arc-extinguishing chamber 2 and the incoming line contact 3 are fixed on the first supporting plate 22 through a fastening nut 24, and the upper end of the vacuum arc-extinguishing chamber 2 is sleeved on the positioning plate 23. To improve the stability of the installation of the vacuum arc-extinguishing chamber 2.

[0023] Preferably, the lower insulating seat 4 is connected with a second supporting plate 18 through a supporting beam 25, the second supporting plate 18 is connected with a grounding contact 26, and the grounding contacts 26 are connected through a grounding copper pipe 27. By this structure, the grounding contact 26 is installed, so that the overall volume of the mechanism is more compact.

[0024] Preferably, the ground contact 26 is provided with guiding surfaces 28 arranged obliquely on both sides of the upper end of the ground contact 26, and is provided with a positioning step 29 at the lower end of the ground contact 26. By arranging the guiding surfaces 28, the blade-type movable contact 6 can be more easily inserted into the ground contact 26 during disconnection, and is positioned by the positioning step 29.

[0025] The above is not intended to limit the utility model in any form, although the utility model has been disclosed as above with a preferred embodiment, however, it is not intended to limit the utility model, any person skilled in the art, without departing from the technical scheme range of the utility model, can make some changes or modifications to the equivalent embodiments of equivalent changes by using the disclosed structure and technical content, however, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the utility model, all still belong to the technical scheme range of the utility model.

Claims

1. A vacuum circuit breaker comprising a bracket (1), a vacuum interrupter (2) mounted on the upper end of the bracket (1), an incoming terminal (3) mounted on the lower end of the vacuum interrupter (2), an outgoing terminal (5) mounted on a lower insulating base (4) of the bracket (1), and two blade movable contacts (6) rotatably arranged on the outgoing terminal (5), the bracket (1) being provided with a square shaft (7) corresponding to the space between the incoming terminal (3) and the outgoing terminal (5), and the square shaft (7) being provided with a crank arm (8) for driving the rotation of the blade movable contacts (6). The rear end of the blade-shaped movable contact (6) is provided with an arc convex surface (9), both sides of the outlet seat (5) are provided with an arc concave surface (10) adapted to the arc convex surface (9), the rear end of the blade-shaped movable contact (6) is rotatably connected with the outlet seat (5) through a bolt (11), and both ends of the bolt (11) are provided with a set of disc springs (12) opposite to each other.

2. The vacuum circuit breaker of claim 1, wherein: The outer side of the rear end of the blade-shaped movable contact (6) is provided with a recess (13), and the inner end face of the disc spring (12) is embedded in the recess (13).

3. The vacuum circuit breaker of claim 1, wherein: The front end of the bolt (11) is provided with a self-locking nut (14), the self-locking nut (14) comprises a nut body (15) and a self-locking seat (16) integrally formed at the rear end of the nut body (15), and the self-locking seat (16) is provided with a self-locking screw (17) abutting against the bolt (11).

4. The vacuum circuit breaker of claim 1, wherein: The front end of the blade-shaped movable contact (6) is also provided with the bolt (11), the bolt (11) is sleeved with a gasket (21) in the middle and is also provided with a set of disc springs (12) opposite to each other at both ends.

5. The vacuum circuit breaker of claim 1, wherein: The lower end of the support (1) is provided with a first support plate (22), and the upper end is provided with a positioning plate (23), the lower end of the vacuum arc chamber (2) and the incoming line contact (3) are fixed on the first support plate (22) through a fastening nut (24), and the upper end of the vacuum arc chamber (2) is sleeved on the positioning plate (23).

6. The vacuum circuit breaker of claim 1, wherein: The lower insulating seat (4) is connected with a second support plate (18) through a support beam (25), the second support plate (18) is connected with a grounding contact (26), and the grounding contacts (26) are connected through a grounding copper pipe (27).

7. The vacuum circuit breaker of claim 6, wherein: The upper end of the grounding contact (26) is provided with an inclined guide surface (28) on both sides, and the lower end is provided with a positioning step (29).

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