CN213583681U

CN213583681U - Circuit breaker

Info

Publication number: CN213583681U
Application number: CN202023230514.6U
Authority: CN
Inventors: 陈会林; 陈红影; 刘洪武
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-06-29
Anticipated expiration: 2030-12-29

Abstract

A circuit breaker belongs to the technical field of low-voltage electrical appliances. The arc extinguishing device comprises a contact device and an arc extinguishing device, wherein a moving contact of the contact device is in contact with or separated from a static contact in a rotating way, so that the circuit is switched on or off, and the arc extinguishing device is characterized in that: the arc extinguishing device comprises a first arc extinguishing chamber, a second arc extinguishing chamber and an arc striking bridge, wherein the first arc extinguishing chamber and the second arc extinguishing chamber are formed by vertically arranging a plurality of arc extinguishing grid pieces, the moving contact and the static contact arc striking plates, the first arc extinguishing chamber and the second arc extinguishing chamber are arranged in opposite directions, the arc striking bridge comprises a first arc striking plate which is matched with the moving contact arc striking plate to form a first arc running channel and a second arc striking plate which is matched with the static contact arc striking plate to form a second arc running channel, opposite ends of the first arc striking plate and the second arc striking plate are connected to form a peak of the arc striking bridge, and the other ends which are far away from each other extend to the bottoms of the first arc extinguishing chamber and the second arc extinguishing chamber respectively, so that an arc generated between the moving contact and the static contact enters. The advantages are that: the arc quenching capacity and the breaking performance of the circuit breaker can be effectively improved.

Description

Circuit breaker

Technical Field

The utility model belongs to the technical field of low-voltage apparatus, concretely relates to circuit breaker.

Background

In low voltage power distribution systems, circuit breakers carry, connect and disconnect current to provide overload and short circuit protection for the system. The contact arc extinguishing device is an important component of the molded case circuit breaker and is directly related to the capacity of the circuit breaker for breaking current and extinguishing electric arc.

For example, the contact arc extinguishing device of the circuit breaker shown in fig. 1 comprises a contact device 1 and an arc extinguishing device 2, wherein a movable contact 11 in the contact device 1 is rotationally contacted with or separated from a fixed contact 12, so that the circuit is connected or disconnected. The arc extinguishing device 2 comprises an arc extinguishing chamber and an arc striking plate. With the continuous improvement of the requirements of power supply and power transmission and distribution equipment in power engineering, the performance of the contact arc-extinguishing device of the circuit breaker needs to be further improved. Therefore, methods such as simply increasing the arc extinguish chamber, lengthening the contact length, increasing the contact opening distance, connecting a plurality of break points in series and the like are commonly adopted in the industry, although the methods can improve the breaking capacity of the molded case circuit breaker, the volume of the molded case circuit breaker can be obviously increased, otherwise, when the volume cannot be obviously increased due to limited space, the improvement effect of the breaking capacity obtained by the measures is limited and not obvious, the two aspects weaken the optimization and improvement effect of the arc extinguish chamber, reduce the product performance improvement range and influence the improvement of the product market competitiveness.

In view of the above-mentioned prior art, there is a need for a reasonable improvement in the structure of the existing circuit breaker. The applicant has therefore made an advantageous design, in the context of which the solution to be described below is made.

Disclosure of Invention

The utility model aims to provide a circuit breaker, its ability of putting out arc that can promote the circuit breaker effectively promotes the breaking performance of circuit breaker.

The utility model aims to solve the problem, and provides a circuit breaker with a contact arc-extinguishing device, wherein the contact arc-extinguishing device comprises a contact device and an arc-extinguishing device, a moving contact in the contact device is rotationally contacted with or separated from a static contact to realize the connection or disconnection of a circuit, the arc-extinguishing device comprises a first arc-extinguishing chamber formed by arranging a plurality of arc-extinguishing grid sheets along the vertical direction, a second arc-extinguishing chamber formed by arranging a plurality of arc-extinguishing grid sheets along the vertical direction, an arc-striking bridge, a moving contact arc-striking plate and a static contact arc-striking plate, the first arc-extinguishing chamber and the second arc-extinguishing chamber are arranged in opposite directions, the arc-striking bridge comprises a first arc-striking plate which is matched with the moving contact arc-striking plate to form a first arc-running channel and a second arc-striking plate which is matched with the static contact arc-striking plate to form a second arc-running channel, and one end of the first arc-striking plate and the second arc-, the other ends of the first arc striking plate and the second arc striking plate, which are far away from each other, extend to the bottom of the first arc extinguish chamber and the bottom of the second arc extinguish chamber respectively, so that a herringbone motion path is formed when electric arcs generated between the moving contact and the fixed contact enter the first arc extinguish chamber and the second arc extinguish chamber.

In an embodiment of the present invention, the first arc extinguish chamber is disposed corresponding to the moving contact, the second arc extinguish chamber is disposed corresponding to the static contact, one end of the moving contact striking plate extends toward the moving contact, and the other end extends to the top of the first arc extinguish chamber, one end of the static contact striking plate is connected to the static contact, and the other end extends to the top of the second arc extinguish chamber, the vertex corresponds to the front of the traveling direction of the arc formed between the moving contact and the static contact when the switch is opened.

In an embodiment of the present invention, an end of the moving contact striking plate extending toward the moving contact is electrically connected to the moving contact.

In one embodiment of the invention, the openings for the entry of the power arc formed by the arc chute blades in the first and second arc chutes are arranged face to face.

In an embodiment of the present invention, an end portion of the moving contact arc striking plate extending to the top of the first arc extinguishing chamber forms an end portion of the moving contact arc striking plate parallel to the arc extinguishing grid plate, and an end portion of the static contact arc striking plate extending to the top of the second arc extinguishing chamber forms an end portion of the static contact arc striking plate parallel to the arc extinguishing grid plate; the end part of the first arc striking plate extending to the bottom of the first arc extinguishing chamber forms a first arc striking plate end part parallel to the arc extinguishing grid piece, the end part of the second arc striking plate extending to the bottom of the second arc extinguishing chamber forms a second arc striking plate end part parallel to the arc extinguishing grid piece, the end part of the moving contact arc striking plate and the end part of the first arc striking plate become two electrodes of the first arc extinguishing chamber, and the end part of the fixed contact arc striking plate and the end part of the second arc striking plate become two electrodes of the second arc extinguishing chamber.

In one embodiment of the present invention, the circuit breaker has one or more poles, each pole including one of the contact arc extinguishing devices.

In an embodiment of the present invention, the circuit breaker has one or more poles, each pole includes two of the contact arc-extinguishing devices, and two of the moving contact arc-striking plates of the contact arc-extinguishing devices are connected to each other at one end extending to the moving contact.

The utility model discloses owing to adopted above-mentioned structure, the beneficial effect who has: set up the second explosion chamber in one side that is close to the static contact, set up first explosion chamber in one side that is close to the moving contact, set up first explosion chamber in prior art's moving contact below space promptly, two sets of explosion chambers are placed in opposite directions, connect through leading the arc bridge between two sets of explosion chambers. Under the prerequisite that does not obviously increase the whole volume of circuit breaker, promote circuit breaker arc extinguishing ability by a wide margin, effectively promote the breaking performance of circuit breaker, and then promote the market competition of product.

Drawings

Fig. 1 is a schematic view of a contact arc extinguishing apparatus of a circuit breaker according to the prior art.

Fig. 2 is a schematic diagram of a contact arc extinguishing device according to an embodiment of the present invention.

Fig. 3 is a side view of a contact arc extinguishing device according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a contact arc extinguishing device according to another embodiment of the present invention.

Fig. 5 is a schematic view of an arc extinguishing device according to another embodiment of the present invention.

Fig. 6a is a side view of an arc extinguishing device of another embodiment of the circuit breaker of the present invention.

Fig. 6b is a top view of an arc extinguishing device according to another embodiment of the circuit breaker of the present invention.

Fig. 7 is a schematic diagram of a movable contact of another embodiment of the circuit breaker of the present invention.

Fig. 8 is a schematic view of a moving contact striking plate according to another embodiment of the present invention.

Fig. 9 is a schematic diagram of a single arc-striking bridge in each embodiment of the circuit breaker of the present invention.

Fig. 10 is a schematic diagram of a single arc extinguishing chamber in each embodiment of the circuit breaker of the present invention.

In the figure: 1. the contact device comprises a contact device, 11. a moving contact, 1101. a moving contact I, 1102. a moving contact II, 12. a fixed contact, 1201. a fixed contact I, 1202. a fixed contact II;

2. the arc extinguishing device comprises an arc extinguishing device 21, a first arc extinguishing chamber 2101, a first arc extinguishing chamber 2102, a first arc extinguishing chamber II, a second

arc extinguishing chamber

22, 2201, a second arc extinguishing chamber I, 2202, a second arc extinguishing chamber II, 23, an arc striking bridge 2301, an arc striking bridge I, 2302, an arc striking bridge II, 230, a vertex, 231, a first arc striking plate, 2311, a first arc striking plate end part, 232, a second arc striking plate, 2321, a second arc striking plate end part, 24, a movable contact arc striking plate, 2401, a movable contact arc striking plate I, 2402, a movable contact arc striking plate II, 2403, a connecting bridge, 241, a movable contact arc striking plate end part, 25, a fixed contact arc striking plate, 2501, a fixed contact arc striking plate I, 2502, a fixed contact arc striking plate II, 251, a fixed contact arc striking plate end part, 201, a first arc running channel, 202 and a second arc running channel;

31. load connection terminals, 32. power connection terminals; 4. and (4) opening.

Detailed Description

The following detailed description of the embodiments of the present invention will be described with reference to the accompanying drawings, but the description of the embodiments by the applicant is not intended to limit the technical solutions, and any changes made according to 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 relating 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.

Example 1

The present embodiments relate to a circuit breaker, which may be single-pole or multi-pole. Each pole may include a contact arc extinguishing device, as shown in fig. 2 and 3, the contact arc extinguishing device includes a contact device 1 and an arc extinguishing device 2, the contact device 1 includes a pair of moving contacts 11 and a pair of stationary contacts 12, the moving contacts 11 are electrically connected to a load connection terminal 31, the stationary contacts 12 are electrically connected to a power connection terminal 32, and the moving contacts 11 are rotatably contacted with or separated from the stationary contacts 12 to achieve connection or disconnection of a circuit.

As shown in fig. 2 and 3, the arc extinguishing device 2 includes a first arc extinguishing chamber 21 formed by a plurality of arc extinguishing grids arranged substantially in a vertical direction, a second arc extinguishing chamber 22 formed by a plurality of arc extinguishing grids arranged substantially in a vertical direction, an arc striking bridge 23, a movable contact arc striking plate 24, and a fixed contact arc striking plate 25.

As shown in fig. 2 and 3, the first arc-extinguishing chamber 21 is disposed on one side of the position of the movable contact 11, and the second arc-extinguishing chamber 22 is disposed on one side of the position of the fixed contact 12, and the two arc-extinguishing chambers are disposed opposite to each other. The method specifically comprises the following steps: the openings formed by the arc chute plates in the two arc chute plates are arranged face to face, i.e. the openings 4 of the U-shaped arc chute plates in the two arc chute plates are arranged face to face, as shown in fig. 2 and 10.

As shown in fig. 2 and fig. 3, one end of the moving contact arc striking plate 24 extending to the position of the moving contact 11 is fixed to the load connection terminal 31, and the other end of the moving contact arc striking plate 24 extends to the top of the first arc extinguishing chamber 21 to form a moving contact arc striking plate end 241 parallel to the arc extinguishing grid. One end of the fixed contact arc striking plate 25 is fixed to the end of the fixed contact 12, and the other end of the fixed contact arc striking plate 25 extends to the top of the second arc extinguish chamber 22, so as to form a fixed contact arc striking plate end 251 parallel to the arc extinguish grid plate.

As shown in fig. 2, 3 and 9, the arc ignition bridge 23 includes a first arc ignition plate 231, which cooperates with the moving contact arc ignition plate 24 to form a first arc running channel 201, and a second arc ignition plate 232, which cooperates with the fixed contact arc ignition plate 25 to form a second arc running channel 202, wherein one end of the first arc ignition plate 231, which is close to the second arc ignition plate 232, is connected to form a vertex 230 of the arc ignition bridge 23, and the vertex 230 corresponds to a position right ahead of a traveling direction of an arc formed between the moving contact 11 and the fixed contact 12 during opening. The other ends of the first arc ignition plate 231 and the second arc ignition plate 232, which are far away from each other, extend to the bottom of the first arc extinguishing chamber 21 and the bottom of the second arc extinguishing chamber 22 respectively, so as to form a first arc ignition plate end 2311 and a second arc ignition plate end 2321 which are parallel to the arc extinguishing grid piece, and therefore, the moving contact arc ignition plate end 241 and the first arc ignition plate end 2311 become two electrodes of the first arc extinguishing chamber 21, and the fixed contact arc ignition plate end 251 and the second arc ignition plate end 2321 become two electrodes of the second arc extinguishing chamber 22. This structure allows the arc generated between the moving contact 11 and the stationary contact 12 to have a motion path of a herringbone shape when it enters the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22.

With continuing reference to fig. 2 and fig. 3, the operating principle of the circuit breaker according to the present embodiment is:

when the moving contact 11 and the static contact 12 are separated, an electric arc is generated between the moving contact and the static contact, under the well-known arc blowing effect, the electric arc moves and elongates towards the arc striking bridge 23, the electric arc is cut into two sections after contacting with the vertex 230, and the first section of the electric arc moves in the first arc running channel 201 and enters the first arc extinguish chamber 21; the second arc moves in the second arc running channel 202 and enters the second arc extinguish chamber 22, namely the first arc and the second arc move away from each other, and the two arcs respectively enter the corresponding arc extinguish chambers and are cooled and extinguished after being fully contacted in the arc extinguish chambers.

Example 2

Each pole of the circuit breaker of this embodiment includes two arc extinguishing contact devices according to embodiment 1, as shown in fig. 4 to 8. The two arc-extinguishing contact devices are installed side by side, that is, two groups of contact devices 1 and two groups of arc-extinguishing contact devices 2 are included, and for convenience of describing the present embodiment, the same components in the two groups of contact devices 1 and the two groups of arc-extinguishing contact devices 2 are denoted by "one" and "two". The two sets of contact devices 1 include two pairs of moving contacts 11 and fixed contacts 12, wherein the two moving contacts 11 are a moving contact one 1101 and a moving contact two 1102 respectively, as shown in fig. 4 and 7, the moving contact one 1101 and the moving contact two 1102 are electrically connected. The two static contacts 12 are respectively a static contact one 1201 and a static contact two 1202, the static contact one 1201 is connected with the power supply wiring terminal 32, the static contact two 1202 is connected with the load wiring terminal 31, and the formed circuit breaker main conductive loop is a known movable contact 11 and a static contact 12 with fork-shaped double breakpoints. When the moving contact 11 and the fixed contact 12 are closed, the current path is: the power supply terminal 32 → the first fixed contact 1201 → the first moving contact 1101 → the second moving contact 1102 → the second fixed contact 1202 → the load terminal 31. On the basis, two first arc-extinguishing chambers 21, two second arc-extinguishing chambers 22, two arc-striking bridges 23, two moving contact arc-striking plates 24 and two static contact arc-striking plates 25 in the two contact arc-extinguishing devices are arranged side by side. As shown in fig. 4 to 6a, the two first arc-extinguishing chambers 21 are a first arc-extinguishing chamber one 2101 and a first arc-extinguishing chamber two 2102, respectively; the two second arc-extinguishing chambers 22 are a first arc-extinguishing chamber 2201 and a second arc-extinguishing chamber 2202 respectively; the two arc ignition bridges 23 are respectively an arc ignition bridge I2301 and an arc ignition bridge II 2302; the two moving contact arc striking plates 24 are a moving contact arc striking plate I2401 and a moving contact arc striking plate II 2402 respectively; the two static contact arc ignition plates 25 are a static contact arc ignition plate I2501 and a static contact arc ignition plate II 2502 respectively.

As shown in fig. 5 and fig. 6b, a first moving contact arc striking plate 2401 in the outer arc contact extinguishing device and a second moving contact arc striking plate 2402 in the inner arc contact extinguishing device are fixedly connected through a connecting bridge 2403.

Referring to fig. 4 to fig. 6a, the working principle of the circuit breaker of the present embodiment is as follows:

when the moving contact 11 and the static contact 12 are separated, an arc is generated between two pairs of the moving contact 11 and the static contact 12, respectively, under the action of well-known arc blowing force, and respectively contacts with and is separated from the vertex 230 of the corresponding arc leading bridge, then the first segment of the arc moves along the first arc running channel 201 formed by the moving contact arc leading plate 24 and the first arc leading plate 231, enters the first arc extinguish chamber 21, the second segment of the arc moves along the second arc running channel 202 formed by the static contact arc leading plate 25 and the second arc leading plate 232, enters the second arc extinguish chamber 22, and finally, a current path formed by the power supply load terminal 32 → the static contact first 1201 → the static contact arc leading piece first 2501 → the second arc extinguish chamber first 2201 → the arc leading bridge first 2301 → the first arc extinguish chamber 2101 → the moving contact arc leading piece first 2401 → the connecting bridge 2403 → the moving contact second arc leading piece 2402 → the first arc extinguish chamber 2102 → the arc leading bridge second 2302 → the second arc extinguish chamber 2202 → the second arc leading piece 1202 → the second 2502 → the load terminal 31, the arc is extinguished in the plurality of arc chutes.

In order to enhance the arc blowing effect, magnetic conductive materials are arranged on the two sides of the first arc running channel 201 and the second arc running channel 202 and on the lower side of the vertex 230 of the arc striking bridge, and are coated by insulating gas generating materials to form the side wall of the arc striking channel.

Claims

1. A circuit breaker is provided with a contact arc extinguishing device, the contact arc extinguishing device comprises a contact device (1) and an arc extinguishing device (2), a moving contact (11) in the contact device (1) is rotationally contacted with or separated from a static contact (12), and the circuit is switched on or off, and the circuit breaker is characterized in that: the arc extinguishing device (2) comprises a first arc extinguishing chamber (21) formed by arranging a plurality of arc extinguishing grid plates in the vertical direction, a second arc extinguishing chamber (22) formed by arranging a plurality of arc extinguishing grid plates in the vertical direction, an arc striking bridge (23), a movable contact arc striking plate (24) and a fixed contact arc striking plate (25), wherein the first arc extinguishing chamber (21) and the second arc extinguishing chamber (22) are arranged in opposite directions, the arc striking bridge (23) comprises a first arc striking plate (231) which is matched with the movable contact arc striking plate (24) to form a first arc running channel (201) and a second arc striking plate (232) which is matched with the fixed contact arc striking plate (25) to form a second arc running channel (202), one ends of the first arc striking plate (231) and the second arc striking plate (232) which are close to each other are connected to form a peak (230) of the arc striking bridge (23), and the other ends of the first arc striking plate (231) and the second arc striking plate (232) which are far away from each other extend to the bottom of the first arc extinguishing chamber (21) and the bottom of the second arc extinguishing chamber (22) respectively, so that the electric arc generated between the moving contact (11) and the fixed contact (12) has a herringbone motion path when entering the first arc-extinguishing chamber (21) and the second arc-extinguishing chamber (22).

2. A circuit breaker according to claim 1, wherein: the arc extinguishing device is characterized in that the first arc extinguishing chamber (21) is arranged corresponding to the movable contact (11), the second arc extinguishing chamber (22) is arranged corresponding to the fixed contact (12), one end of the movable contact arc striking plate (24) extends towards the movable contact (11), the other end of the movable contact arc striking plate extends to the top of the first arc extinguishing chamber (21), one end of the fixed contact arc striking plate (25) is connected with the fixed contact (12), the other end of the fixed contact arc striking plate extends to the top of the second arc extinguishing chamber (22), and the vertex (230) corresponds to the front of the advancing direction of an electric arc formed between the movable contact (11) and the fixed contact (12) during opening.

3. A circuit breaker according to claim 2, wherein: one end of the moving contact arc striking plate (24) extending towards the moving contact (11) is electrically connected with the moving contact (11).

4. A circuit breaker according to claim 2, wherein: the openings formed by arc-extinguishing grids in the first arc-extinguishing chamber (21) and the second arc-extinguishing chamber (22) for the entry of electric arcs are arranged face to face.

5. A circuit breaker according to claim 2, wherein: the end part of the moving contact arc striking plate (24) extending to the top of the first arc extinguishing chamber (21) forms a moving contact arc striking plate end part (241) parallel to the arc extinguishing grid sheet, and the end part of the static contact arc striking plate (25) extending to the top of the second arc extinguishing chamber (22) forms a static contact arc striking plate end part (251) parallel to the arc extinguishing grid sheet; the end part of the first arc striking plate (231) extending to the bottom of the first arc extinguishing chamber (21) forms a first arc striking plate end part (2311) parallel to the arc extinguishing grid piece, the end part of the second arc striking plate (232) extending to the bottom of the second arc extinguishing chamber (22) forms a second arc striking plate end part (2321) parallel to the arc extinguishing grid piece, the moving contact arc striking plate end part (241) and the first arc striking plate end part (2311) become two electrodes of the first arc extinguishing chamber (21), and the static contact arc striking plate end part (251) and the second arc striking plate end part (2321) become two electrodes of the second arc extinguishing chamber (22).

6. A circuit breaker according to claim 2, wherein: the circuit breaker has one or more poles, each pole including one of the contact arc extinguishing devices.

7. A circuit breaker according to claim 2, wherein: the circuit breaker is provided with one or more poles, each pole comprises two contact arc extinguishing devices, and one ends of moving contact arc striking plates (24) in the two contact arc extinguishing devices, which extend towards a moving contact (11), are connected with each other.