WO2021237980A1

WO2021237980A1 - Magnetic blow-out mechanism of circuit breaker

Info

Publication number: WO2021237980A1
Application number: PCT/CN2020/114672
Authority: WO
Inventors: 夏初阳
Original assignee: 新驰电气集团有限公司
Priority date: 2020-05-28
Filing date: 2020-09-11
Publication date: 2021-12-02
Also published as: CN111627778A

Abstract

A magnetic blow-out mechanism of a circuit breaker, comprising a housing (3). A handle (1) is mounted at the upper end of the housing (3); a connection rod (2) is mounted on one side of the handle (1); one side of the connection rod (2) is connected to a tripping mechanism; a moving contact (9) is provided at the tail end of the tripping mechanism; wiring screws (5) are provided on two sides of the housing (3); a tripping coil (4) is provided below the handle (1); an arc extinguishing chamber (6) is provided below the tripping coil (4); an upper arc striking plate (11) and a lower arc striking plate (12) are respectively provided at upper and lower ends of the arc extinguishing chamber (6); a static contact (8) is provided at one end of the upper arc striking plate (11); the lower arc striking plate (12) extends to one side, and an arc striking angle (10) is formed at an extending and bending part of the lower arc striking plate (12); a bimetallic sheet (13) is provided on one side of the arc striking angle (10); and a magnetic blow-out coil (7) is provided at the lower end of the extending part of the lower arc striking plate (12). A self-excitation magnetic field is added in an electric arc breaking process of a product, electric arcs are rapidly blown into the arc extinguishing chamber (6), the arcing time of electric arcs on moving and static contacts is shortened, the service life of the product is prolonged, current does not pass through the coil during working, and temperature rise is low.

Description

Magnetic blowing mechanism of circuit breaker

Technical field

The invention relates to a circuit breaker magnetic blowing mechanism, which belongs to the technical field of circuit breakers.

Background technique

When the switchgear cuts off the circuit or closes the circuit, if the electric field strength between the moving and static contacts is greater than the dielectric strength, the insulating gas between the contacts is broken down and becomes a free state. The gas in the free state has a very Strong electrical conductivity, which is essentially the conversion of the insulating medium into a conductor, that is, an arc is formed, especially in the DC line because the current does not cross zero, the arc needs to be forcibly cut off by means of elongation, cooling, etc., so that the product The design of arc extinguishing brings great difficulty. In particular, high-voltage DC1000v and 1500v systems appear in photovoltaic systems at present, which brings greater challenges to the product. The comparison document 201310379814.6 proposes a DC circuit breaker, and the magnetic blowing coil proposed in the DC circuit breaker is located in the pilot arc Inside the corner, this method is difficult to implement in the actual process, and the benefit is low, and the inner side is the arc extinguishing channel, the coil structure is susceptible to great interference, the traditional circuit breaker magnetic blowing mechanism usually has a permanent magnet placed inside the arc extinguishing grid. Cut off the arc to cool down, because the magnetic field force F=BIL received by the DC arc, the larger the current, the greater the electromagnetic field force, which is beneficial to pull the arc to the arc extinguishing chamber; the smaller the current, the smaller the electromagnetic field force is, which is not conducive to pulling the arc toward Arc extinguishing chamber, so the DC arc has "critical load current".

technical problem

In order to solve the above problems, the present invention proposes a reasonable structure, a magnetic blowing coil is connected in series, the product increases the self-excited magnetic field during the arc breaking process, and quickly blows the arc into the arc extinguishing chamber, and shortens the arc burning time on the moving and static contacts. , Improve the service life of the product. When working, the current does not pass through the coil, and the magnetic blowing mechanism of the circuit breaker with low temperature rise.

Technical solutions

The magnetic blowing mechanism of a circuit breaker of the present invention includes a casing, a handle is installed on the upper end of the casing, a connecting rod is installed on one side of the handle, and one side of the connecting rod is connected with a tripping mechanism. The tail end is equipped with movable contacts, the two sides of the housing are equipped with wiring screws, the lower part of the handle is equipped with a trip coil, and the lower part of the trip coil is equipped with an arc extinguishing chamber. The upper and lower ends are respectively equipped with an upper arc ignition plate and a lower arc ignition plate, one end of the upper arc arc plate is equipped with a static contact, the lower arc arc plate extends to one side, and the lower arc arc plate extends and bends A pilot arc angle is formed at the location, a bimetal sheet is installed on one side of the arc pilot angle, and a magnetic blowing coil is installed at the lower end of the extension of the lower arc pilot plate.

Further, an arc extinguishing grid is installed in the arc extinguishing chamber.

Further, an adjusting screw for adjusting the initial position of the bimetal is installed under the terminal screw.

Further, the magnetic blowing coil is located outside the arc-initiating angle.

Beneficial effect

Compared with the prior art, the present invention has the following beneficial effects: the present invention has a reasonable structure, a magnetic blowing coil is connected in series, and the product increases the self-excited magnetic field during the arc breaking process, and quickly blows the arc into the arc extinguishing chamber, shortening the movement and static of the arc. The arcing time on the contact can increase the service life of the product. When working, the current does not pass through the coil and the temperature rise is low.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Figure 1 is a schematic diagram of the structure of the present invention.

Figure 2 is a cross-sectional view of the internal structure of the present invention.

Fig. 3 is a schematic diagram of the mechanism connection of the present invention.

Fig. 4 is a schematic diagram of the magnetic blowing coil of the present invention.

1- Handle; 2- Connecting rod; 3- Housing; 4- Trip coil; 5- Wiring screw; -Pilot arc angle; 11-Upper pilot arc board; 12- Lower pilot arc board; 13-Bimetallic sheet.

The best mode of the present invention

The magnetic blowing mechanism of a circuit breaker as shown in the figure includes a housing 3, the upper end of the housing 3 is equipped with a handle 1, the handle 1 is equipped with a connecting rod 2 on one side, and the connecting rod 2 is connected to one side of the handle 1. The tripping mechanism is connected. The tail end of the tripping mechanism is equipped with a movable contact 9. The two sides of the housing 3 are equipped with wiring screws 5, and the bottom of the handle 1 is equipped with a tripping coil 4. An arc extinguishing chamber 6 is installed under the coil 4. The upper and lower ends of the arc extinguishing chamber 6 are respectively equipped with an upper arcing plate 11 and a lower arcing plate 12, and one end of the upper arcing plate 11 is equipped with a static contact 8 , The lower arc pilot plate 12 extends to one side, the extension and bend of the lower arc arc plate 12 forms a pilot arc angle 10, and a bimetallic sheet 13 is installed on one side of the arc pilot angle 10, and the lower arc A magnetic blowing coil 7 is installed at the lower end of the extension of the arc ignition plate 12.

Wherein, the arc extinguishing chamber 6 is equipped with an arc extinguishing grid.

An adjustment screw for adjusting the initial position of the bimetal 13 is installed below the terminal screw 5.

The magnetic blowing coil 7 is located outside the arc-initiating angle 10.

The invention has a reasonable structure and is connected in series with a magnetic blowing coil. The product increases the self-excited magnetic field during the arc breaking process, quickly blows the arc into the arc extinguishing chamber, shortens the arc burning time on the moving and static contacts, and improves the service life of the product. , The current does not pass through the coil, and the temperature rise is low.

The above-mentioned embodiments merely describe the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by those skilled in the art to the technical solution of the present invention shall fall within the protection scope of the present invention. All the technical content claimed by the present invention has been It is stated in the claims.

Claims

A magnetic blowing mechanism for a circuit breaker, comprising a housing, characterized in that: the upper end of the housing (3) is equipped with a handle (1), and one side of the handle (1) is equipped with a connecting rod (2). One side of the rod (2) is connected with a tripping mechanism, the tail end of the tripping mechanism is equipped with a moving contact (9), the housing (3) is equipped with wiring screws (5) on both sides, and the handle ( 1) A tripping coil (4) is installed below, an arc extinguishing chamber (6) is installed below the tripping coil (4), and upper arc ignition plates are installed at the upper and lower ends of the arc extinguishing chamber (6). (11) and the lower arc ignition plate (12). One end of the upper arc ignition plate (11) is equipped with a static contact (8), and the lower arc ignition plate (12) extends to one side. The arc plate (12) extends and bends to form a pilot arc angle (10), the arc pilot angle (10) is equipped with a bimetallic sheet (13) on one side, and the lower arc pilot plate (12) extends at the lower end Equipped with a magnetic blowing coil (7).
The magnetic blowing mechanism of a circuit breaker according to claim 1, wherein the arc extinguishing chamber (6) is equipped with an arc extinguishing grid.
The magnetic blowing mechanism of a circuit breaker according to claim 1, characterized in that: an adjusting screw for adjusting the initial position of the bimetallic strip (13) is installed under the terminal screw (5).
The magnetic blowing mechanism of a circuit breaker according to claim 1, characterized in that: the magnetic blowing coil (7) is located outside the arc striking angle (10).