CN203596311U - Arc-extinguishing structure of isolation switch - Google Patents

Abstract

An arc-extinguishing structure of an isolation switch mainly aims to solve the problems that the load current breaking capacity of an existing isolation switch is not ideal, and especially when the existing isolation switch is applied to a direct current, the existing isolation switch fails to break the load current because the direct current has no zero crossing points. The arc-extinguishing structure of the isolation switch is characterized in that arc-extinguishing grid sheets are arranged on one side, close to moving contacts, of connecting parts of fixed contacts, and the arc-extinguishing grid sheets are distributed on two ends of the moving contacts. The arc-extinguishing structure of the isolation switch has the advantages that the arc-extinguishing grid sheets are distributed on two sides of load-breaking arc area of the moving contacts and the fixed contacts, and when the isolation switch is in the load-breaking process, electric arcs are generated, and the electric arcs are laterally blown to the arc-extinguishing grid sheets quickly under the effect of the electromagnetic force, so that the arc-extinguishing effect is effectively improved, and the breaking capacity is improved.

Description

An arc extinguishing structure of an isolating switch

technical field

The utility model relates to an isolating switch, in particular to an arc extinguishing structure of the isolating switch.

Background technique

Isolating switch is a kind of electrical appliance that is widely used in low-voltage switching appliances. It is divided into two types of use: current breaking with load and current breaking without load. This technology involves isolating switches that can break current with load. When the switch is broken with a load, an arc will be generated between the moving and static contacts. The arc will bring a lot of heat and generate air ions. If the arc stays between the moving and static contacts for too long, it may burn the contacts or even cause an arc short circuit. Burning the switch requires us to do arc extinguishing as soon as possible. At present, the common practice of isolating switches is to install arc extinguishing grids under the contact area between the moving contact and the static contact, resulting in a long distance between the arc extinguishing grid and the contact area, and most of the arcs generated when the switch is opened and closed cannot enter the arc extinguishing In the Shan chip, it is impossible to achieve fast arc extinguishing, so the breaking capacity of the current with load is not ideal.

Utility model content

In order to overcome the deficiencies and defects in the background technology, the utility model provides an arc extinguishing structure of an isolating switch, which mainly solves the problem of unsatisfactory current breaking capacity of the existing isolating switch with load.

The technical solution of the utility model is: an arc extinguishing structure of a disconnector, including a base, a static contact, a moving contact, and an arc extinguishing grid, and the static contact includes a wiring part, a contact part and a connecting wiring part The connection part with the contact part; the fixed contacts are respectively fixed on both sides of the base through the connection parts, and the contact parts are arranged symmetrically inward; the moving contact corresponds to the contact part of the static contact; The arc grids are arranged on the side of the static contact connecting part close to the moving contact, and are distributed at both ends of the moving contact.

The shape of the arc extinguishing grid is "L".

An arc-shaped groove is provided on the inner side of the horizontal section and the vertical section of the arc extinguishing grid.

The arc extinguishing grid is divided into a first arc extinguishing grid and a second arc extinguishing grid, the position of the arc groove on the first arc extinguishing grid is symmetrical to the position of the arc groove on the second arc extinguishing grid, The first arc extinguishing grid is spaced apart from the second arc extinguishing grid.

Beneficial effects of the utility model: due to the adoption of the above scheme, an arc-extinguishing structure of a disconnector, the arc-extinguishing grids are arranged on both sides of the arc area where the dynamic and static contacts are disconnected with load, and when the disconnector is disconnected with load, a Under the action of electromagnetic force, the arc is quickly blown laterally to the arc extinguishing grid, which effectively improves the arc extinguishing effect, thereby improving its breaking capacity. At the same time, the improvement of arc extinguishing capacity and breaking capacity further protects static The contact surface of the moving contact is not ablated, so that the times and life of the isolating switch with load current breaking are greatly improved.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

Figure 2 is a schematic diagram of the structure of the static contact.

Fig. 3 is a schematic diagram of the structure of the arc extinguishing grid.

In the figure: 1-base, 2-static contact, 21-connection part, 22-contact part, 23-connection part, 3-moving contact, 4-arc extinguishing grid, 4a-first arc extinguishing grid , 4b-the second arc extinguishing grid, 41-arc groove.

Detailed ways

Embodiments of the utility model are further described below with reference to the accompanying drawings:

As shown in Figures 1-3, an arc extinguishing structure of a disconnector includes a base 1, a static contact 2, a moving contact 3, and an arc extinguishing grid 4. The static contact 2 includes a wiring part 21, The contact part 22 and the connecting part 23 connecting the wiring part 21 and the contact part 22; the static contacts 2 are respectively fixed on both sides of the base 1 through the connecting part 23, and the contact parts 22 are arranged symmetrically inward; the moving contact The head 3 corresponds to the contact part 22 of the static contact 2; the arc extinguishing grid 4 is arranged on the side of the connection part 23 of the static contact 2 close to the moving contact 3, and is distributed at both ends of the moving contact 3, The arc extinguishing grid 4 is just located on both sides of the arc area of the static contact 2 and the moving contact 3 with load breaking. When the disconnector is load breaking, an arc is generated. The arc is affected by the electromagnetic force and blows to the arc extinguishing grid sideways. , the arc is divided into small segments and moves along the surface of the arc extinguishing grid, the arc is cooled by the iron arc extinguishing grid, and the conductive ions dissipate quickly, so that the arc is quickly extinguished and its breaking capacity is improved. The arc is blown away from the conductive contact surface of the dynamic and static contacts, which effectively protects the contact surface of the dynamic and static contacts from being ablated by the arc, and greatly improves the life of the number of disconnection switches with load current breaking.

The shape of the arc extinguishing grid 4 is "L", a part of which is located on both sides of the arcing area of the moving contact 3 and the static contact 2, and a part is located on the lower side of the arcing area, so that the arc extinguishing grid 4 covers a better surface. wide, the arc extinguishing effect will be more sufficient.

As shown in Figure 1 and Figure 3, the arc extinguishing grid is divided into two types: the first arc extinguishing grid 4a and the second arc extinguishing grid 4b, and an arc-shaped groove 41 is provided on the inner side of their horizontal section and vertical section. , the position of the arc groove 41 on the first arc extinguishing grid 4a is symmetrical to the position of the arc groove 41 on the second arc extinguishing grid 4b, the first arc extinguishing grid 4a and the second arc extinguishing grid The pieces 4b are arranged at intervals, and this structural arrangement can elongate the arc a little, so that the arc extinguishing effect is better.

The utility model is suitable for occasions of alternating current or direct current application, especially in the field of direct current application, and has great significance. In the direction of DC application, it can be applied to applications with fixed current direction or non-fixed current direction, such as battery loads.

The embodiment should not be regarded as limiting the utility model, but any improvement based on the spirit of the utility model should be within the protection scope of the utility model.

Claims (4)

1. the arc extinguishing structure of an isolating switch, comprise pedestal (1), fixed contact (2), moving contact (3), arc extinguishing grid pieces (4), it is characterized in that: described fixed contact (2) includes wire connecting portion (21), contact site (22) and connects the connecting portion (23) of wire connecting portion (21) and contact site (22); Described fixed contact (2) is separately fixed at the both sides of pedestal (1) by connecting portion (23), its contact site (22) is arranged symmetrically with inwardly; Described moving contact (3) is corresponding with the contact site (22) of fixed contact (2); Described arc extinguishing grid pieces (4) is arranged on the side of fixed contact connecting portion (23) by moving contact (3), and is distributed in the two ends of moving contact (3).

2. the arc extinguishing structure of isolating switch according to claim 1, is characterized in that: the structure of described arc extinguishing grid pieces (4) is " L " shape structure.

3. the arc extinguishing structure of isolating switch according to claim 2, is characterized in that: arc extinguishing grid pieces (4) crosspiece is equipped with one section of arc groove (41) with perpendicular section inner side.

4. the arc extinguishing structure of isolating switch according to claim 3, it is characterized in that: arc extinguishing grid pieces (4) is divided into the first arc extinguishing grid pieces (4a) and the second arc extinguishing grid pieces (4b), the position of the position of the upper arc groove (41) of described the first arc extinguishing grid pieces (4a) and the upper arc groove (41) of the second arc extinguishing grid pieces (4b) is symmetrical, and the first arc extinguishing grid pieces (4a) is arranged with the second arc extinguishing grid pieces (4b) interval.

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