CN217740460U

CN217740460U - Pole unit module of switch

Info

Publication number: CN217740460U
Application number: CN202222147200.2U
Authority: CN
Inventors: 龚子砺; 吴义; 张洵初
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2022-11-04
Anticipated expiration: 2032-08-16

Abstract

A pole unit module of a switch belongs to the technical field of low-voltage apparatuses. The movable contact assembly comprises two movable contacts extending in the opposite direction, the movable contact assembly rotates, the two movable contacts are separated from or closed to a fixed contact corresponding to the two movable contacts respectively to form a rotary double-breakpoint contact system, each pair of movable and fixed contacts is provided with an arc extinguish chamber, an arc striking plate is arranged at the top or bottom of the arc extinguish chamber, the end part of the arc striking plate extends to the movable contact at the opening position and is used for connecting and striking electric arcs generated on the movable contacts, and the movable contact assembly is characterized in that: the two arc striking plates are connected through an equipotential connecting piece. The advantages are that: the equipotential connecting piece is used for changing a short-circuit current path, short-circuit current is prevented from flowing through the moving contact in the short-circuit breaking process, the burning time of an electric arc on the moving contact is shortened, the moving contact is prevented from being ablated, the breaking capacity of the switch is improved, and the electric service life of the switch is prolonged.

Description

Pole unit module of switch

Technical Field

The utility model belongs to the technical field of the low-voltage apparatus, concretely relates to utmost point unit module of switch.

Background

Switches such as circuit breakers, which are extremely important parts in a circuit system, are used more and more widely because they can automatically break a circuit when a fault occurs in a line, prevent an accident from being expanded, and ensure safe operation. The arc extinguishing system is used as a core component of the circuit breaker for realizing the circuit protection function, the cutting and extinguishing capabilities of the arc extinguishing system on the electric arc directly determine whether the circuit breaker breaks a fault circuit successfully, and meanwhile, the arc extinguishing system is also a key factor influencing the characteristics of the circuit breaker, such as the service life and the like.

In order to improve the arc extinguishing performance of the arc extinguishing system and reduce the burning loss of the moving contact and the static contact, in the prior art, the arc striking plate is usually arranged to accelerate the transfer of an arc root, so as to realize quick arc extinguishing and reduce the burning loss of the contact.

However, the moving contact is a movable part, and a gap is necessarily formed between the moving contact and the arc striking plate. In the breaking process, after the electric arc is transferred to the arc striking plate, a section of short arc still exists between the moving contact and the arc striking plate. Particularly, when high voltage is disconnected, due to the fact that the disconnection energy is high, the moving contact is continuously burnt due to the short arc, the distance between the moving contact and the arc striking plate is increased, arc transfer is more difficult, and the arc extinguishing capability is reduced.

In view of the above-mentioned prior art, there is a need for a rational improvement of the pole cell module structure of existing switches. The applicant has made an advantageous design for this purpose, in the context of which the solution to be described below is made.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a polar element module of switch, it avoids flowing through short-circuit current and can reducing the burning of electric arc on the moving contact on the short circuit breaking process on the moving contact through changing the short-circuit current route to improve switch breaking capacity and electric life.

The utility model aims at reaching like this, a polar element module of switch, including moving contact subassembly and two static contacts that set up with moving contact subassembly symmetry, moving contact subassembly includes two moving contacts that extend dorsad each other, and moving contact subassembly rotates, two moving contacts on it respectively with a static contact separation or closure that correspond separately, constitute rotatory double break point contact system, correspond to every to move, the static contact is equipped with an explosion chamber respectively to top or bottom at this explosion chamber have a run-on board, the tip of run-on board extends to the moving contact of minute floodgate position for meet the electric arc that the run-on produced on the moving contact, characteristics are: the two arc striking plates are connected through an equipotential connecting piece.

In a specific embodiment of the present invention, two of the arc striking plates are formed by bending two end portions of the equipotential connecting member in the length direction.

In another specific embodiment of the present invention, the arc striking plate and the equipotential connecting member are made of copper.

In another specific embodiment of the present invention, two of the arc striking plates are respectively welded and fixed to the corresponding end portions of the equipotential connecting member.

In another specific embodiment of the present invention, the equipotential bonding element is a rigid rod or a flexible wire.

In still another specific embodiment of the present invention, the arc striking plate is made of iron, and the equipotential connecting member is made of copper.

In yet another specific embodiment of the present invention, the pole unit module further includes a housing having a hexahedral structure, the movable contact assembly, the fixed contact, the arc extinguish chamber, and the arc striking plate are all disposed in the cavity of the housing, a pair of sidewalls of the housing, which are axially disposed of the movable contact assembly, are disposed on each other, and an opening for connecting the equipotential connecting member and the arc striking plate is respectively disposed at positions corresponding to the two arc striking plates.

In a more specific embodiment of the present invention, the equipotential connecting element extends linearly over the lateral wall.

In yet another specific embodiment of the present invention, the equipotential bonding element is in the shape of an "L" extending over the sidewall.

In a still more specific embodiment of the present invention, the equipotential connecting member is covered with an insulating sleeve or an insulating tape.

The utility model discloses owing to adopted the equipotential connecting piece, borrow by the equipotential connecting piece and change short-circuit current path, avoid flowing through short-circuit current on the short circuit break-make in-process movable contact, play and show the combustion time who shortens electric arc on the moving contact, avoid the moving contact to ablate, both can improve switch breaking capacity, can prolong the electric life of switch again.

Drawings

Fig. 1 is the inside schematic view of the pole unit module casing of the present invention.

Fig. 2 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 3 is a schematic structural diagram of embodiment 2 of the present invention.

Fig. 4 is a schematic diagram of the outside of the pole unit module and the equipotential connecting member of the present invention.

In the figure: 1. a moving contact; 2. static contact; 3. arc extinguish chamber, 31. Grid sheet; 4. an arc striking plate; 5. an equipotential connecting piece; 6. shell, 61 side wall, 62 top wall, 63 bottom wall, 64 opening.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the description of the embodiments is not intended to limit the technical solutions, and any changes made in the form of the present invention rather than the essential changes should be considered as the protection scope of the present invention.

In the following description, any concept related to the directions or orientations of up, down, left, right, front, and rear is based on the position shown in the corresponding drawings, and thus should not be construed as particularly limiting the technical solution provided by the present invention.

As shown in fig. 1-4, the utility model relates to a switch, this switch includes operating device, two at least utmost point unit modules etc., each utmost point unit module has a shell 6, this shell 6 generally comprises a pair of casing of splicing each other, splice each other the back, at the inside cavity that constitutes of shell 6, the cavity content is equipped with a moving contact subassembly, two static contacts 2 that set up with the rotation central symmetry of moving contact subassembly, a pair of explosion chamber 3, the moving contact subassembly includes two moving contacts 1 that extend dorsad each other, the moving contact subassembly rotates, two moving contacts 1 on it separate with a static contact 2 that corresponds separately or closed respectively, constitute rotatory double break point contact system, every explosion chamber 3 corresponds a pair of action, the static contact sets up, have an arc runner 4 at the top of this explosion chamber 3 or bottom, the tip of arc runner 4 extends to the moving contact 1 of split brake position, be used for connect the electric arc that produces on moving contact 1. The arc extinguishing chamber 3 comprises a plurality of grid pieces 31 which are arranged at intervals in a stacked mode, as shown in fig. 2, an arc striking plate 4 is arranged at the top of the right arc extinguishing chamber 3, and the arc striking plate 4 can be formed by extending the uppermost grid piece 31 or can be independently arranged above the uppermost grid piece 31; the arc striking plate 4 is arranged at the bottom of the left arc extinguishing chamber 3, and the arc striking plate 4 can be formed by extending on the lowermost grid 31 or can be separately arranged below the lowermost grid 31.

As the technical points of the utility model are: the two arc ignition plates 4 are connected through an equipotential connecting piece 5.

As shown in fig. 2, in embodiment 1 of the present invention, the arc ignition plate 4 and the equipotential connecting member 5 adopt an integral structure, that is, two arc ignition plates 4 are directly formed by bending two end portions of the equipotential connecting member 5 in the length direction. In this embodiment, the arc striking plate 4 and the equipotential connecting member 5 are both made of copper.

As shown in fig. 3, in embodiment 2 of the present invention, two arc plates 4 are respectively welded and fixed to the corresponding end portions of the equipotential connecting member 5. In this embodiment, the equipotential connecting part 5 is a rigid guide rod or a flexible conductor; the arc striking plate 4 is made of iron, and the equipotential connecting piece 5 is made of copper.

As shown in fig. 4, the housing 6 of the pole cell module is substantially a hexahedral structure having a pair of side walls 61 axially disposed with respect to each other as a movable contact assembly, a top wall 62 and a bottom wall 63 perpendicular to the side walls 61, and an opening 64 for connecting the equipotential connectors 5 to the arc ignition plates 4 is opened at one of the pair of side walls 61 and at a position corresponding to the two arc ignition plates 4, respectively.

The equipotential connecting elements 5 extend in a straight line over the side walls 61. Of course, the extending shape is not limited, and the equipotential connectors 5 may also extend on the side wall 61 in an L shape, that is, the equipotential connectors 5 extend from one of the openings 64 to the bottom wall 63 and then bend to extend to the other opening 64 on the side wall 61.

A groove 65 is further formed in the housing 6 along the extension of the equipotential bonding apparatus 5, and the equipotential bonding apparatus 5 is located in the groove 65. The equipotential connecting piece 5 needs to be insulated, and insulation can be realized by wrapping an insulating sleeve or winding an insulating adhesive tape.

Please continue to refer to fig. 2, the working principle of the present invention is described: two arc striking plates 4 are connected by equipotential connecting piece 5, after the electric arc on moving contact 1 shifts to two arc striking plates 4, the current path no longer passes through two moving contacts 1, but from left side binding post, left side static contact 2, left side explosion chamber 3, left side arc striking plate 4 (be located left side explosion chamber bottom), equipotential connecting piece 5, right side arc striking plate 4 (be located right side explosion chamber top), flow from right side static contact 2 again behind the right side explosion chamber 3, right side binding post, the arc between left side static contact 2 and the left side arc extinguishing bars piece between equipotential connecting piece 5 and the right side static contact 2 and the arc between left side static contact and the right side static contact are divided by the cutting of right side arc extinguishing bars piece between equipotential connecting piece 5 and the right side static contact. At the moment, the moving contact 1 does not flow a short-circuit current any more, so that the burning time of the electric arc on the moving contact is greatly reduced, the ablation of the moving contact can be avoided, and the breaking capacity and the electric service life of the circuit breaker are improved.

Claims

1. The utility model provides a polar unit module of switch, includes moving contact subassembly and two static contacts (2) with moving contact subassembly symmetry setting, moving contact subassembly includes two moving contacts (1) that extend dorsad each other, and moving contact subassembly rotates, and two moving contacts (1) on it separate or are closed with a static contact (2) that correspond respectively, constitute rotatory double break point contact system, correspond to and are equipped with an explosion chamber (3) respectively to every moving, static contact, and have an arc striking board (4) at the top or the bottom of this explosion chamber (3), the tip of arc striking board (4) extends to moving contact (1) of separating the floodgate position for connect the electric arc that produces on moving contact (1), its characterized in that: the two arc striking plates (4) are connected through an equipotential connecting piece (5).

2. Pole cell module of a switch according to claim 1, characterised in that the two arc ignition plates (4) are directly formed by bending the two ends of the equipotential bonding element (5) in the length direction.

3. Pole cell module of a switch according to claim 2, characterised in that the arc starting plate (4) and the equipotential connecting piece (5) are both made of copper.

4. The pole cell module of a switch according to claim 1, characterized in that two said arc ignition plates (4) are welded to the respective ends of the equipotential connecting means (5).

5. Pole cell module of a switch according to claim 4, characterized in that the equipotential bonding means (5) is a rigid conductor bar or a flexible conductor.

6. The pole cell module of a switch according to claim 5, characterized in that the arc ignition plate (4) is made of iron and the equipotential bonding element (5) is made of copper.

7. The pole unit module of a switch according to claim 1, characterized in that the pole unit module further comprises a housing (6) having a hexahedral structure, the moving contact assembly, the stationary contact (2), the arc extinguishing chamber (3), and the arc striking plates (4) are all disposed in the cavity of the housing (6), and an opening (64) for connecting the equipotential connecting member (5) and the arc striking plates (4) is respectively opened at a position corresponding to the two arc striking plates (4) on one of a pair of axially disposed sidewalls (61) of the housing (6) that are mutually moving contact assemblies.

8. Pole cell module of a switch according to claim 7, characterized in that said equipotential bonding means (5) extends linearly over the lateral wall (61).

9. Pole cell module of a switch according to claim 7, characterized in that said equipotential bonding means (5) extend in the shape of an "L" on the side wall (61).

10. Pole cell module of a switch according to claim 8 or 9, characterized in that the equipotential bonding means (5) are covered with an insulating sleeve or an insulating tape.