CN114783822A - A double-contact structure of a vacuum interrupter - Google Patents

Abstract

The invention discloses a double-contact structure of a vacuum arc extinguish chamber, which sequentially comprises a static end cover plate, a porcelain shell and a movable end cover plate from top to bottom, wherein a closed vacuum chamber is formed among the static end cover plate, the porcelain shell and the movable end cover plate; the outer walls of the static contact and the convex structure are provided with chutes, and a shielding cover for covering the static contact and the moving contact is arranged in the closed vacuum chamber. The beneficial effects are as follows: the current surge resistance can be improved and the service life can be prolonged.

Description

A double-contact structure of a vacuum interrupter

technical field

The invention relates to a double-contact structure of a vacuum interrupter.

Background technique

Vacuum interrupter is the core component of medium and high voltage power switch, mainly used in power transmission and distribution control system, but also in metallurgy, mining, petroleum, chemical, railway, industry and other power distribution systems. At present, the design and manufacturing process of vacuum interrupter products on the market are relatively mature, but there are still certain deficiencies.

The influence of the current passing through the vacuum interrupter on the vacuum interrupter mainly has the following two points: First, the greater the current passing through the vacuum interrupter, the higher the temperature of the arc generated at the moment of contact breaking, and the effect of the arc on the vacuum interrupter. The influence of contacts (such as ablation, aging, etc.) will also be more serious; the second is that the vacuum interrupter has a maximum resistance to current, so when an excessive current is suddenly generated in the distribution line (such as a short-circuit fault) It will cause great damage to the vacuum interrupter.

If the above problems can be solved, the performance and service life of the vacuum interrupter will be greatly improved, bringing great economic benefits.

SUMMARY OF THE INVENTION

The problem to be solved by the present invention is to provide a double-contact structure of the vacuum interrupter which can improve the current impact resistance performance and service life.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:

A double-contact structure of a vacuum interrupter includes a static end cover plate, a porcelain shell, and a moving end cover plate in sequence from top to bottom, and a closed vacuum cavity is formed between the static end cover plate, the porcelain shell, and the moving end cover plate. It is characterized in that: two static contacts are arranged separately below the static end cover plate, and a static guide rod extending to the outside of the static end cover plate is respectively provided on the top of the static contact. The top of the movable end cover is provided with a bellows, the closed vacuum chamber is provided with a movable contact, the top of the movable contact is provided with two protruding structures, and the two static contacts are respectively connected with one of the The protruding structures are correspondingly arranged, and the movable end cover is movably connected with a movable guide rod which passes through the corrugated tube and is connected with the movable contact; the outer walls of the static contact and the protruding structure are provided with inclined The closed vacuum chamber is provided with a shielding cover covering the static contact and the moving contact.

Preferably, in the above-mentioned double-contact structure of the vacuum interrupter, the two static contacts are arranged symmetrically; the two protruding structures are arranged symmetrically.

Preferably, in the above-mentioned double-contact structure of the vacuum interrupter, one of the static contacts is a first hollow cylinder, and the other static contact is a first hollow cylinder disposed in the inner cavity of the first hollow cylinder. a solid cylinder; one of the protruding structures is a second hollow cylinder, the other protruding structure is a second solid cylinder disposed in the inner cavity of the second hollow cylinder, and the first hollow cylinder The body is arranged corresponding to the second hollow cylinder, and the first solid cylinder is arranged corresponding to the second solid cylinder.

Preferably, in the above-mentioned double-contact structure of the vacuum interrupter, the inclined grooves are arranged on the outer walls of the first hollow cylinder and the second hollow cylinder.

Preferably, in the double-contact structure of the vacuum interrupter, the top of the bellows is provided with a movable end guide sleeve, and the movable guide rod passes through the movable end guide sleeve and slides with the movable end guide sleeve connect.

Preferably, in the above-mentioned double-contact structure of the vacuum interrupter, the bottom of the static end cover plate is provided with a static end guide sleeve, and the static guide rod passes through the static end guide sleeve.

Preferably, in the above-mentioned double-contact structure of the vacuum interrupter, a sealed space is formed between the moving end guide sleeve, the shielding cover, and the static end guide sleeve, and the moving contact and the static contact are arranged in the sealed space Inside.

The technical effect of the present invention is mainly reflected in:

The current passing through the vacuum interrupter in the distribution line is divided into two parts and connected to two static guide rods respectively. After the vacuum interrupter is closed, the two static contacts are in contact with the two protruding structures respectively, forming two The group of contact channels conducts the circuit, and the current value of each group of conducting circuits is 1/2 of the current value in the distribution line. When the switch is opened, the temperature of the arc generated between the moving contact and the static contact decreases due to the current. When there is a short-circuit fault in the distribution line, the impact resistance of the vacuum interrupter to the short-circuit current will also be greatly improved, thereby improving the service life of the vacuum interrupter; The inclined groove and the inclined groove structure on the static contact will generate an induced magnetic field, constrain the arc and make the arc evenly distributed on the protruding structure and the surface of the static contact, so as to protect the contact from being seriously ablated by the arc.

Description of drawings

1 is a cross-sectional view of the present invention in Embodiment 1;

Fig. 2 is the sectional view of the present invention in embodiment 2;

FIG. 3 is another angular structural schematic diagram of FIG. 2 .

Detailed ways

The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings, so as to make the technical solutions of the present invention easier to understand and grasp.

Example 1

As shown in FIG. 1, a double-contact structure of a vacuum interrupter includes a static end cover plate 11, a porcelain shell 12, a moving end cover plate 13, a static end cover plate 11, a porcelain shell 12, a moving end cover plate 11, a porcelain shell 12, a moving end cover plate 11, a A closed vacuum chamber is formed between the end caps 13 .

In the present invention, two static contacts 21 are provided separately below the static end cover 11 . In this embodiment, the two static contacts 21 are symmetrically arranged, and a top of the static contacts 21 is respectively provided with one extending to the static end cover. 11. The static guide rod 23 on the outer side, the top of the movable end cover plate 13 is provided with a bellows 24, the airtight vacuum chamber is provided with a movable contact 25, and the top of the movable contact 25 is provided with two protruding structures 26. The outlet structure 26 is symmetrically arranged, the two static contacts 21 are respectively arranged corresponding to a protruding structure 26, and the movable end cover plate 13 is movably connected with a movable guide rod 27 which passes through the bellows 24 and is connected with the movable contact 25; The outer walls of the contact 21 and the protruding structure 26 are provided with inclined grooves 28 , and a shielding cover 29 covering the static contact 21 and the movable contact 25 is provided in the airtight vacuum chamber.

The top of the bellows 24 in the present invention is provided with a movable end guide sleeve 30, the movable guide rod 27 passes through the movable end guide sleeve 30 and is slidably connected with the movable end guide sleeve 30, and the bottom of the static end cover plate 11 is provided with a static end guide sleeve 31 , the static guide rod 23 passes through the static end guide sleeve 31 .

In the present invention, a sealed space is formed between the moving end guide sleeve 30 , the shielding cover 29 and the static end guide sleeve 31 , and the moving contact 25 and the static contact 21 are arranged in the sealed space.

Example 2

As shown in Figures 2 and 3, a double-contact structure of a vacuum interrupter includes a static end cover plate 11, a porcelain shell 12, a moving end cover plate 13, a static end cover plate 11, and a porcelain shell 12 in order from top to bottom. , A closed vacuum chamber is formed between the cover plates 13 of the movable end.

In the present invention, there are two static contacts 21 separated from the bottom of the static end cover 11 . In this embodiment, one of the static contacts is the first hollow cylinder 41 , and the other static contact is arranged on the first hollow cylinder 41 . The first solid cylinder 42 in the inner cavity of the cylinder; the top of the static contact 21 is respectively provided with a static guide rod 23 extending to the outside of the static end cover plate 11, and the top of the moving end cover plate 13 is provided with a bellows 24 to seal the vacuum A movable contact 25 is arranged in the chamber, and two protruding structures 26 are arranged on the top of the movable contact 25, one of which is the second hollow cylinder 51, and the other is arranged on the second hollow cylinder. The second solid cylinder 52 in the inner cavity of 51 , the first hollow cylinder 41 is arranged corresponding to the second hollow cylinder 51 , and the first solid cylinder 42 is arranged corresponding to the second solid cylinder 52 . The movable end cover 13 is movably connected with a movable guide rod 27 which passes through the corrugated tube 24 and is connected with the movable contact 25; The chute 28 is provided on the outer walls of the first hollow cylinder 41 and the second hollow cylinder 51 .

The top of the bellows 24 in the present invention is provided with a movable end guide sleeve 30, the movable guide rod 27 passes through the movable end guide sleeve 30 and is slidably connected with the movable end guide sleeve 30, and the bottom of the static end cover plate 11 is provided with a static end guide sleeve 31 , the static guide rod 23 passes through the static end guide sleeve 31 .

In the airtight vacuum chamber of the present invention, a shielding cover 29 covering the static contact 21 and the moving contact 25 is provided. In the present invention, a sealed space is formed between the moving end guide sleeve 30 , the shielding cover 29 and the static end guide sleeve 31 , and the moving contact 25 and the static contact 21 are arranged in the sealed space.

The technical effect of the present invention is mainly reflected in:

The current passing through the vacuum interrupter in the distribution line is divided into two parts, and connected to two static guide rods 23 respectively. After the vacuum interrupter is closed, the two static contacts 21 are in contact with the two protruding structures 26 respectively. , forming two groups of contact channel conduction circuits, the current value of each group of conduction circuits is 1/2 of the current value in the distribution line, and the temperature of the arc generated between the moving contact 25 and the static contact 21 when the switch is opened It is greatly reduced due to the reduction of the current; when there is a short-circuit fault in the distribution line, the impact resistance of the vacuum interrupter to the short-circuit current will also be greatly improved, thereby improving the service life of the vacuum interrupter; The inclined groove 28 on the protruding structure 26 and the inclined groove 28 on the static contact 21 will generate an induced magnetic field, which constrains the arc and makes the arc evenly distributed on the surface of the protruding structure 26 and the static contact 21 to protect the contact from arcing. Severely ablated.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for convenience The invention is described and simplified without indicating or implying that the device or element referred to must have a particular orientation, as well as a particular orientation configuration and operation, and therefore should not be construed as limiting the invention. In addition, "first" and "second" are for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

Claims (7)

1. The utility model provides a two contact structures of vacuum interrupter, down includes quiet end cover plate, porcelain shell, moves end cover plate from last in proper order, quiet end cover plate, porcelain shell, move and form airtight vacuum chamber, its characterized in that between the end cover plate: the lower part of the static end cover plate is separately provided with two static contacts, the tops of the static contacts are respectively provided with a static guide rod extending to the outer side of the static end cover plate, the top of the movable end cover plate is provided with a corrugated pipe, a movable contact is arranged in the closed vacuum chamber, the top of the movable contact is provided with two convex structures, the two static contacts are respectively arranged corresponding to the convex structures, and the movable end cover plate is movably connected with a movable guide rod which penetrates through the corrugated pipe and is connected with the movable contact; the outer walls of the static contact and the protruding structure are provided with chutes, and a shielding cover for covering the static contact and the moving contact is arranged in the closed vacuum chamber.

2. The vacuum interrupter dual contact structure of claim 1, wherein: the two fixed contacts are symmetrically arranged; the two protruding structures are symmetrically arranged.

3. The vacuum interrupter dual contact structure of claim 1, wherein: one static contact is a first hollow cylinder, and the other static contact is a first solid cylinder arranged in the inner cavity of the first hollow cylinder; one of them the protrusion structure is the second hollow cylinder, and another the protrusion structure is for setting up the solid cylinder of second in the hollow cylinder inner chamber of second, first hollow cylinder with the corresponding setting of second hollow cylinder, first solid cylinder with the corresponding setting of second solid cylinder.

4. The vacuum interrupter dual contact structure of claim 3, wherein: the chute is arranged on the outer walls of the first hollow cylinder and the second hollow cylinder.

5. The vacuum interrupter dual contact structure according to claim 2 or 3, characterized in that: the top of the corrugated pipe is provided with a movable end guide sleeve, and the movable guide rod penetrates through the movable end guide sleeve and is in sliding connection with the movable end guide sleeve.

6. The vacuum interrupter dual contact structure of claim 5, wherein: the bottom of the static end cover plate is provided with a static end guide sleeve, and the static guide rod penetrates through the static end guide sleeve.

7. The vacuum interrupter dual contact structure of claim 6, wherein: a sealed space is formed among the movable end guide sleeve, the shielding cover and the static end guide sleeve, and the movable contact and the static contact are arranged in the sealed space.

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