CN111564334A - Contact device of vacuum arc-extinguishing chamber - Google Patents

Abstract

The application relates to a vacuum interrupter contact device, which belongs to the technical field of medium and high voltage vacuum switches. The present application includes a contact base and a contact piece, the upper edge of the contact base is connected with the contact piece, and also includes a support and a connecting piece, one end of the connecting piece is connected with the bottom wall of the contact base, and the other end of the connecting piece is connected with the supporting piece One end is slidably connected, and the other end of the support is connected with the contact piece. In the present application, a support piece and a connecting piece are added between the bottom of the contact seat and the contact piece, which is reasonable in design, simple and practical, effectively shortens the bouncing time between the contacts during closing, reduces the bouncing amplitude, and reduces the phenomenon of contact welding. It also solves the problem that the contacts are easily deformed by the welding force when the switch is opened.

Description

A vacuum interrupter contact device

technical field

The application belongs to the field of medium and high voltage vacuum switches, and in particular relates to a contact device for a vacuum interrupter.

Background technique

Vacuum switch is the key equipment in the field of power transmission and distribution. About 95% of the switchgear in my country's medium-voltage distribution power system adopts vacuum switch. The vacuum interrupter is the core component of the vacuum switch, and the contact is the heart of the vacuum interrupter. Therefore, the structure of the contact has a great influence on the performance of the vacuum interrupter. When the vacuum interrupter is closed, the closing driving force generated when the moving and static contacts are in contact causes a bouncing phenomenon between the moving and static contacts, and due to the small distance between the moving and static contacts, the contacts The gap will break down, and the current will flow along the breakdown channel, which will generate a large amount of Joule heating on the contact, resulting in local melting of the contact surface. Under contact pressure, the molten areas will stick together and solidify when the temperature is lowered, and fusion welding will occur on the contact surfaces. When the vacuum interrupter is opened, the dynamic and static contacts welded together will deform under the tension of the opening force. In severe cases, the contacts will crack or cannot be opened.

CN103915284A discloses a damping structure for a contact seat, comprising a reinforcing rib, one end of the reinforcing rib is welded on the contact seat of the positive seat structure or the cup drag of the reverse seat structure, and the other end of the reinforcing rib is movably clamped into the fixing ring part, and when the contacts are in contact, the reinforcing ribs are reinforced. One end of the rib expands outward after being stressed, and part of the force is consumed during the expansion process, which effectively reduces the bouncing range and bouncing time between the contacts. Affect the normal service life of the contact seat.

SUMMARY OF THE INVENTION

The present application provides a contact device for a vacuum interrupter to solve the problems of bouncing, welding, contact deformation and the like generated during the closing and opening of the existing vacuum interrupter contact device.

The technical solution adopted in the present application is as follows: the present application is a contact device for a vacuum interrupter, comprising a contact seat and a contact piece, the upper edge of the contact seat is connected with the contact piece, and also includes a support and a connection One end of the connecting piece is connected with the bottom wall of the contact base, the other end of the connecting piece is slidably connected with one end of the support piece, and the other end of the support piece is connected with the contact piece.

The contact seat is cup-shaped and is provided with an inner cavity, the open end of the inner cavity is the upper edge of the contact seat, and the bottom surface of the inner cavity is the bottom wall of the contact seat.

Further, a plurality of protruding teeth are arranged along the inner circumferential direction of the end of the connecting piece that is close to the bottom wall of the contact seat, and a first tooth is arranged along the outer circumferential direction of the end of the connecting piece that is far away from the bottom wall of the contact seat. a flange.

The bottom wall of the contact base is provided with a groove, a fixing column is arranged in the groove, and a plurality of fixing platforms are arranged along the outer circumferential direction of one end of the fixing column and away from the bottom wall of the groove.

Further, an inner circular disk is arranged along the inner circumferential direction of the support member and one end of the bottom wall of the contact base, and one end of the inner circular disk is sleeved with the connecting piece to provide the first flange one end of the connecting piece, so that the supporting piece can slide along the outer wall of the connecting piece.

Further, a second flange is provided along the outer circumferential direction of one end of the support member away from the bottom wall of the contact base, and the contact piece is provided with an annular groove that is inserted into the second flange.

Further, the distance between the inner annular disk and the bottom wall of the contact seat is 0.5 mm-1 mm, and the distance between the inner annular disk and the first flange is 0.5 mm-2 mm.

Further, it is not necessary to take the structure that the supporting member is sheathed outside the connecting member, and the connecting member can also be sheathed outside the supporting member.

The beneficial effects of adopting the technical solution of the present application are as follows:

In the contact device of the vacuum interrupter of the present application, when the vacuum interrupter is closed, that is, the moving and static contacts are in contact, the contact piece is subjected to the closing driving force, so that the support piece connecting the contact piece is driven along the direction of the connecting piece. The outer wall moves towards the bottom wall of the contact base until the inner ring disc of the support piece contacts the bottom wall of the contact base. This process converts part of the closing impact force received by the contacts into the support piece and the contact piece along the outer wall of the connecting piece. The sliding kinetic energy effectively consumes the closing impact force, shortens the bounce amplitude and bounce time between the contacts during closing, and avoids the occurrence of contact heating and welding; The parts can support the contact seat to ensure that the contact seat will not be deformed or even directly cracked by the energy that is not consumed.

When the vacuum interrupter is opened, that is, at the moment when the moving and static contacts are separated, especially when fusion welding occurs between the moving and static contacts, the supporting piece moves along the connecting piece in the direction consistent with the opening force, and the first The arrangement of a flange limits the sliding distance of the support within a certain range, avoids the excessively stretched and deformed contact seat due to excessive kinetic energy generated by the support during sliding, and effectively prolongs the opening of the vacuum interrupter. interrupting current capability and service life.

The design of the application is reasonable, simple and practical. By arranging a support and a connecting piece between the contact seat and the contact piece, the bouncing time between the contacts during closing is effectively shortened, the bouncing amplitude is reduced, and the phenomenon of contact welding is reduced. It also solves the problem of deformation of the contacts caused by the welding force when the switch is opened.

Description of drawings

In order to illustrate the technical solutions of the present application more clearly, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, without creative work, the Additional drawings can be obtained from these drawings.

Fig. 1 is the front sectional view of a kind of vacuum interrupter contact device of the application;

2 is a front sectional view of the connector 4 of the application;

3 is a top view of the connector 4 of the application;

FIG. 4 is a front cross-sectional view of the contact holder 1 of the application;

FIG. 5 is a top view of the contact holder 1 of the application;

6 is a front cross-sectional view of the support 3 of the application;

Illustration description:

Among them, 1-contact seat, 2-contact piece, 3-support piece, 4-connector, 11-fixed column, 12-fixed table, 31-inner ring disk, 32-second flange, 41- Raised teeth, 42-first flange.

Detailed ways

Embodiments will be described in detail below, examples of which are illustrated in the accompanying drawings. Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following examples are not intended to represent all implementations consistent with this application. are merely exemplary of systems and methods consistent with some aspects of the present application as recited in the claims.

1 is a front cross-sectional view of a contact device for a vacuum interrupter, including the upper edge of the contact base 1 connected with the contact piece 2, and a support 3 and a connecting piece 4, one end of the connecting piece 4 is connected to the contact The bottom wall of the base 1 is connected, the other end of the connecting piece 4 is slidably connected with one end of the supporting piece 3 , and the other end of the supporting piece 3 is connected with the contact piece 2 .

The contact holder 1 is in the shape of a cup holder and is provided with an inner cavity, the open end of the inner cavity is the upper edge of the contact holder 1 , and the bottom surface of the inner cavity is the bottom wall of the contact holder 1 .

Referring to FIGS. 2 and 3 , a plurality of protruding teeth 41 are provided along the inner circumferential direction of the end of the connecting piece 4 that is close to the bottom wall of the contact base 1 , and are set along the outer circumferential direction of the end of the connecting piece 4 that is far away from the bottom wall of the contact base 1 The first flange 42 .

Referring to FIGS. 4 and 5 , the bottom wall of the contact base 1 is provided with a groove, a fixing column 11 is arranged in the groove, and a plurality of fixing columns are arranged along the outer circumferential direction of the end of the fixing column 11 and away from the bottom wall of the groove. Desk 12. One end of the connecting piece 4 with the protruding teeth 41 is sleeved on the fixing column 11 .

The shape of the fixing table 12 in this embodiment is a rectangular parallelepiped, of course, it can also be a U-shape or an L-shape, which will not be repeated here.

Referring to FIG. 6, an inner circular disk 31 is arranged along the inner circumferential direction of the support member 3 and one end of the bottom wall of the contact base 1, in order to realize the device of the present application can move freely and at the moment of opening and closing of the vacuum interrupter. Without any jamming phenomenon, the inner diameter of the annular inner disk 31 should be smaller than the outer diameter of the first flange 42 . One end of the support member 3 provided with the inner circular disk 31 is sleeved with one end of the connection member 4 provided with the first flange 42 , and the support member 3 can slide along the outer wall of the connection member 4 .

A second flange 32 is provided along the peripheral direction of one end of the support 3 away from the bottom wall of the contact base 1 .

The contact piece 2 is provided with an annular groove that is inserted into the second flange 32 , the height of the annular groove is smaller than the height of the contact piece 2 , and the ring width of the annular groove is equal to that of the second flange 32 .

The distance between the inner ring disc 31 and the bottom wall of the contact base 1 is 0.5mm-1mm. When the vacuum interrupter is closed, the contact piece 2 and the support 3 are subjected to the closing impact force to the bottom wall of the contact base 1. Moving, the moving stroke is the distance between the inner annular disk 31 and the bottom wall of the contact base 1 . If the moving distance is less than 0.5mm, the closing impact force cannot be effectively consumed, and the effect of the support 3 cannot be exerted; due to the limited space in the inner cavity of the contact seat 1, if the moving distance is set to be greater than 1mm, the processing cost will be increased.

The distance between the inner ring disk 31 and the first flange 42 is 0.5mm-2mm. When the vacuum interrupter is opened, the inner ring disk 31 moves along the outer wall of the support 4 in the direction consistent with the closing, and moves The stroke is the distance between the inner annular disk 31 and the first flange 42 . If the moving distance is less than 0.5mm, the opening force cannot be effectively consumed. If the remaining opening force is too large, the support 3 will be pulled and the first flange 41 will be linked to stretch the fixed column 11 of the contact base 1, resulting in the failure of the fixed column 11. Deformation; due to the limited space in the inner cavity of the contact seat 1, the processing cost will be increased when the set moving distance is greater than 2 mm.

It is not a necessary structure that the support 3 is sheathed outside the connector 4 , and the connector 4 can also be sheathed outside the support 3 , so that the sliding connection between the support 3 and the connector 4 can still be achieved.

In the contact device of the vacuum interrupter of the present application, when the vacuum interrupter is closed, that is, the moving and static contacts are in contact, the contact piece is subjected to the closing driving force, so that the support piece connecting the contact piece is driven along the direction of the connecting piece. The outer wall moves towards the bottom wall of the contact base until the inner ring disc of the support piece contacts the bottom wall of the contact base. This process converts part of the closing impact force received by the contacts into the support piece and the contact piece along the outer wall of the connecting piece. The sliding kinetic energy effectively consumes the closing impact force, shortens the bounce amplitude and bounce time between the contacts during closing, and avoids the occurrence of contact heating and welding; The parts can support the contact seat to ensure that the contact seat will not be deformed or even directly cracked by the energy that is not consumed.

When the vacuum interrupter is opened, that is, when the moving and static contacts are separated, especially when fusion welding occurs between the moving and static contacts, the supporting piece moves along the connecting piece in the direction consistent with the opening force and consumes part of the energy , and the setting of the first flange limits the sliding distance of the support within a certain range, which avoids the phenomenon that the contact seat is deformed due to excessive stretching of the support due to excessive kinetic energy generated when the support slides, and effectively prolongs the vacuum extinguishing process. The breaking current capability and service life of the arc chamber.

Similar parts between the embodiments provided in the present application may be referred to each other. The specific embodiments provided above are just a few examples under the general concept of the present application, and do not constitute a limitation on the protection scope of the present application. For those skilled in the art, any other implementations expanded according to the solution of the present application without creative work fall within the protection scope of the present application.

Claims (6)

1. A vacuum interrupter contact device, comprising a contact seat (1) and a contact sheet (2), the upper edge of the contact seat (1) is connected with the contact sheet (2), characterized in that It further comprises a support piece (3) and a connecting piece (4), one end of the connecting piece (4) is connected with the bottom wall of the contact seat (1), and the other end of the connecting piece (4) is connected with the bottom wall of the contact seat (1). One end of the support member (3) is slidably connected, and the other end of the support member (3) is connected with the contact piece (2). 2 . A vacuum interrupter contact device according to claim 1 , characterized in that: it is arranged along the inner circumferential direction of the connecting piece ( 4 ) and one end close to the bottom wall of the contact base ( 1 ). 3 . a plurality of protruding teeth (41), a first flange (42) is provided along the outer circumferential direction of one end of the connector (4) and away from the bottom wall of the contact seat (1); the contact seat (1) The bottom wall is provided with a groove, a fixing column (11) is arranged in the groove, and a plurality of fixing platforms (12) are arranged along the peripheral direction of the end of the fixing column (11) and away from the bottom wall of the groove. 3. A vacuum interrupter contact device according to claim 1, characterized in that: it is arranged along the inner peripheral direction of the support member (3) and one end close to the bottom wall of the contact base (1) An inner annular disk (31) is sleeved with the first flange (42), so that the support member (3) can slide along the outer wall of the connecting member (4). 4. A vacuum interrupter contact device according to claim 1, characterized in that: along the outer circumferential direction of the end of the support member (3) and away from the bottom wall of the contact seat (1), a first Two flanges (32), the contact piece (2) is provided with an annular groove that is inserted into the second flange (32). 5. A vacuum interrupter contact device according to claim 3, wherein the distance between the inner annular disc (31) and the bottom wall of the contact seat (1) is 0.5mm -1mm. 6. A vacuum interrupter contact device according to claim 3, characterized in that: the distance between the inner annular disc (31) and the first flange (42) is 0.5mm- 2mm.

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