CN210535544U

CN210535544U - Arc extinguishing device

Info

Publication number: CN210535544U
Application number: CN201920365560.5U
Authority: CN
Inventors: 丁飞; 曹健; 张明学
Original assignee: Shanghai Liangxin Electrical Co Ltd
Current assignee: Shanghai Liangxin Electrical Co Ltd
Priority date: 2019-03-21
Filing date: 2019-03-21
Publication date: 2020-05-15
Anticipated expiration: 2029-03-21

Abstract

The utility model provides an arc control device, it includes static contact (1), and explosion chamber (2) are adorned static contact (1) top, in bars foot (201) of the arc extinguishing bars piece of explosion chamber (2) stretched into gas production cover (3), the break-make of circuit breaker, its characterized in that are being controlled with the disconnection to the joint of moving contact (4) and static contact (1): through the improvement to the arc control device structure, increase relevant partial arc component that separates, improved the speed of extinguishing of the electric arc in having accelerated the circuit breaker arc extinguish chamber, thereby when having effectively prevented breaking the heavy current, the air current that produces moves the defect that damages the circuit breaker toward moving contact one side. Meanwhile, the static contact, the arc extinguish chamber and the magnetic conduction block are positioned by using the self structural characteristics of the insulating part, so that the maintenance and debugging difficulty of the circuit breaker is reduced. Still increase the improvement to explosion chamber arc extinguishing bars piece overall arrangement structure for the circuit breaker further effectively elongates, divides the branch, extinguishes the electric arc that produces when the contact breaks off in high voltage service environment, promotes the breaking performance of circuit breaker.

Description

Arc extinguishing device

Technical Field

The utility model belongs to the technical field of the low-voltage circuit breaker, specifically say so and relate to an arc control device.

Background

The circuit breaker is the most important distribution equipment in a low-voltage distribution system, along with the continuous improvement of the requirements of power supply and power transmission and distribution equipment in power engineering, the performance requirements for a circuit protection switch are higher and higher, and the miniaturization, high performance, modularization and high reliability are the main development directions of the air circuit breaker at the present stage. The contact and the arc extinguishing system are important components of the circuit breaker, and the shape and the size design of the contact in the contact system are very critical and directly relate to the electrical service life and the breaking capacity of the circuit breaker.

An arc extinguishing chamber in the circuit breaker plays roles of lengthening, breaking and extinguishing an electric arc generated when a contact is broken in a short-circuit fault, but the conventional arc extinguishing chamber structure is easy to generate electric breakdown in the processes of lengthening, breaking and extinguishing the electric arc generated when the contact is broken in a high-voltage environment, so that long-time arc burning is finally caused, and the breaking performance of the circuit breaker is reduced. When the large current is cut off, the generated airflow moves to one side (mechanism side) of the moving contact to drive the electric arc to move inwards, so that the circuit breaker mechanism is burnt out.

SUMMERY OF THE UTILITY MODEL

The utility model aims at exactly being to the not good technical defect of arc extinguishing effect of explosion chamber among the above-mentioned prior art, an arc control device is provided, through the improvement to the arc control device structure, increase relevant partial arc component that separates, the speed of extinguishing of electric arc in having further improved the quickened circuit breaker arc chamber, especially under high voltage environment to the lengthening of the electric arc that produces when the contact breaks off, divide absolutely, the ability of extinguishing further promotes, when having effectively prevented dividing disconnected heavy current, thereby the air current of production moves the defect of damage circuit breaker toward moving contact one side.

Technical scheme

In order to realize the technical purpose, the utility model provides a pair of arc control device, it includes the static contact, and the explosion chamber dress is in the static contact top, in the bars foot of the arc extinguishing bars piece of explosion chamber stretched into the product gas cover, the break-make of circuit breaker, its characterized in that are being controlled with the disconnection to the joint of moving contact and static contact: the gas production cover comprises a left cavity and a right cavity, grid pins of arc extinguishing grid pieces of the arc extinguishing chambers extend into isolating grooves in the corresponding left cavity and the right cavity, at least one isolating rib is correspondingly arranged at the bottoms of the left cavity and the right cavity, and the isolating ribs are positioned between the magnetic conduction blocks and the static silver points on the static contacts to isolate the magnetic conduction blocks and the static silver points from each other.

Furthermore, the distance between the bottom of the groove of the arc extinguishing grid piece of the arc extinguishing chamber and the outer side end of the gas production cover is not more than 2 mm.

Furthermore, a connecting block is arranged between the bottoms of the left cavity and the right cavity and is positioned outside the static contact and above the static contact.

Furthermore, a moving contact gas generating piece is fixedly arranged on the moving contact and is positioned between the moving contact and the static contact.

Furthermore, the moving contact gas generating piece is of a U-shaped structure, and the bottom surface of the U-shaped structure is located between the moving contact and the static contact.

Further, the left chamber and the right chamber are integrated.

Furthermore, the insulating part is positioned on the inner side of the U-shaped bend of the static contact, the insulating part starts to cover from the inner side of the U-shaped bend of the static contact and at least extends to the bend part on the upper part of the static contact, and a positioning structure is arranged on the insulating part and can position the arc extinguish chamber and the magnetic conduction block and enable the insulating part to realize self-limiting when the static contact is installed.

Furthermore, the positioning structure comprises an insulating part groove arranged on the insulating part and used for positioning and installing a magnetic conduction block in the U-shaped bend of the static contact, two side edges of the insulating part extend upwards to form bulges so as to position the arc extinguish chamber, and at least one side of the insulating part is provided with a downward convex block so as to enable the insulating part to realize self-limiting when the static contact is installed.

Furthermore, the protrusion extends into the arc extinguish chamber and is attached to the inner cavity wall of the arc extinguish chamber to realize the positioning of the arc extinguish chamber.

Further, the lug extends to the lower part of the contact surface of the lower part of the insulating part and the fixed contact.

Further, the arc extinguishing grid pieces of the arc extinguishing chamber sequentially comprise a top arc striking piece, an upper arc extinguishing grid piece group, a middle arc extinguishing grid piece group and a bottom arc extinguishing grid piece group from top to bottom, the length of the upper arc-extinguishing grid plate group towards one side of the moving contact is shorter than that of the middle arc-extinguishing grid plate group towards one side of the moving contact, the upper arc-extinguishing grid group is distributed in a sector shape from top to bottom from the side facing the moving contact to the side far away from the moving contact, the curve track formed by the end head of the upper arc-extinguishing grid sheet group facing one side of the moving contact corresponds to the moving track of the moving contact, the length of the bottom arc-extinguishing grid plate group towards one side of the moving contact is shorter than that of the middle arc-extinguishing grid plate group towards one side of the moving contact, the middle arc-extinguishing grid plate group and the bottom arc-extinguishing grid plate group are parallel to each other, and the thickness of the top arc striking plate and the thickness of the bottom arc-extinguishing grid plate group are larger than that of the upper arc-extinguishing grid plate group and the middle arc-extinguishing grid plate group.

Furthermore, the connecting line of the end of the middle arc-extinguishing grid group and the end of the bottom arc-extinguishing grid group far away from one side of the moving contact are straight lines, the connecting line of the end of the upper arc-extinguishing grid group far away from one side of the moving contact is a smooth curve, and the connecting part of the connecting line of the end of the middle arc-extinguishing grid group far away from one side of the moving contact and the connecting line of the end of the upper arc-extinguishing grid group far away from one side of.

Further, the top arc striking plate comprises a base and an end, the end protrudes out of the base and inclines upwards, and the base and the end are V-shaped.

Preferably, the number of the top arc striking plates is 1, the number of the upper arc extinguishing grid plate groups is 5-9, the number of the middle arc extinguishing grid plate groups is 11-15, and the number of the bottom arc extinguishing grid plate groups is 1-3.

Advantageous effects

The utility model provides a pair of arc control device, through the improvement to the arc control device structure, increase the arc component that separates of relevant part, improved the speed of extinguishing of electric arc in having accelerated the circuit breaker arc extinguishing chamber, especially under the high voltage environment to the elongation of the electric arc that produces when the contact breaks off, divide absolutely, extinguish the ability and further promote, effectively prevented when dividing disconnected heavy current, thereby the air current of production moves the defect that damages the circuit breaker toward moving contact one side. Meanwhile, the static contact, the arc extinguish chamber and the magnetic conduction block are positioned by using the self structural characteristics of the insulating part, so that the maintenance and debugging difficulty of the circuit breaker is reduced. And the improvement on the layout structure of arc extinguishing grid pieces of the arc extinguishing chamber is also added, so that the circuit breaker further effectively elongates, breaks and extinguishes the electric arc generated when the contact is disconnected in a high-voltage use environment. The breaking performance of the circuit breaker is improved.

Drawings

Fig. 1 is a perspective view of an embodiment of the present invention.

Fig. 2 is a schematic diagram of a position structure of an isolation rib in an embodiment of the present invention.

Fig. 3 is a schematic diagram of a position structure of the connection block in the embodiment of the present invention.

Fig. 4 is a schematic diagram of a position structure of the groove in the embodiment of the present invention.

Fig. 5 is a schematic view of the gas production hood structure in the embodiment of the present invention.

Fig. 6 is a schematic structural view of an insulating member according to an embodiment of the present invention.

Fig. 7 is a schematic view of a static contact structure in an embodiment of the present invention.

Fig. 8 is a schematic structural diagram of an arc chute in an embodiment of the present invention.

Fig. 9 is a schematic diagram of a position structure of an arc chute in an embodiment of the present invention.

Fig. 10 is a schematic view of a position structure of an arc striking plate according to an embodiment of the present invention.

Fig. 11 is a schematic structural diagram of an arc striking plate in an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Examples

The arc extinguishing chamber aims to solve the problem that electric breakdown is easy to occur in the processes of elongation, breaking and extinguishing of an electric arc generated when a contact is disconnected in a conventional arc extinguishing chamber structure under a high-voltage environment, and finally long-time arc burning is caused; when the large current is cut off, the generated airflow moves to one side (mechanism side) of the movable contact to drive the electric arc to move inwards, so that the mechanism is burnt out; the electric arc and the moving contact have large breakdown risk (the moving contact and the moving contact form an included angle, the rear end is close, and the breakdown is easy) after the contacts are opened, and the like. In this embodiment, an arc extinguishing apparatus is designed, as shown in fig. 1, and includes a stationary contact 1, an arc extinguishing chamber 2 is installed above the stationary contact 1, and grid pins 201 of arc extinguishing grid pieces of the arc extinguishing chamber 2 extend into a gas generating cover 3, as shown in fig. 4 and 5, the bottom of a groove 202 of the arc extinguishing grid pieces of the arc extinguishing chamber 2 is as close as possible to an outer end 305 of the gas generating cover 3, and the distance is not greater than 2 mm. The connection and disconnection between the moving contact 4 and the fixed contact 1 controls the on-off of the circuit breaker, wherein, as shown in fig. 5, the gas generating cover 3 includes a left chamber 301 and a right chamber 302, and in this embodiment, the left chamber 301 and the right chamber 302 are integrated. The grid pins 201 of the arc-extinguishing grid pieces of the arc-extinguishing chamber 2 extend into the isolation grooves 301a and 302a in the corresponding left chamber 301 and right chamber 302, as shown in fig. 2, at least one isolation rib 303,303 'is arranged at the bottom of the left chamber 301 and right chamber 302, the isolation rib 303,303' is positioned between the magnetic conductive block 5 and the static silver point 101 on the static contact 1 to perform an arc isolation and to insulate the magnetic conductive block 5, as shown in fig. 3, a connection block 304 is arranged between the bottoms of the left chamber 301 and right chamber 302, the connection block 304 is positioned outside the static silver point 101 and above the static contact 1 to perform an arc isolation. A moving contact gas generating element 6 is fixedly mounted on the moving contact 4, the moving contact gas generating element 6 is located between the moving contact 4 and the static contact 1, specifically, in this embodiment, the moving contact gas generating element 6 is a U-shaped structure, and the bottom surface of the U-shaped structure is located between the moving contact 4 and the static contact 1.

In addition, further, the relative positions of the fixed contact, the magnetic conduction block and the arc extinguish chamber in the existing molded case circuit breaker are determined by the positioning characteristics on the base, so that the relative position relation among the three parts is difficult to debug and maintain, and a replacement part is difficult to find. The molded case circuit breaker component mounting structure is realized as follows: as shown in fig. 1, 6, and 7, the insulating member 7 is located inside the U-shaped bend of the static contact 1, the insulating member 7 covers from the inside 102 of the U-shaped bend of the static contact 1 and extends at least to the bend 103 at the upper portion of the static contact 1, and a positioning structure is disposed on the insulating member 7, so as to position the arc extinguish chamber 2 and the magnetic conductive block 5 and enable the insulating member 7 to achieve self-limiting when the static contact 1 is installed.

Specifically, in this embodiment, as shown in fig. 6, the positioning structure includes an insulating member groove 701 formed in the insulating member 7 and used for positioning and mounting the magnetic conductive block 5 in the U-shaped bend of the static contact 1, protrusions 702,702' extending upward from two side edges of the insulating member 7 can position the arc extinguish chamber 2, and a downward protrusion 703 is formed on at least one side of the insulating member 7, so that the insulating member 7 can achieve self-limiting when being mounted in the static contact 1. The protrusion 702,702' extends into the arc extinguish chamber 2 and sticks to the inner cavity wall of the arc extinguish chamber 2 to realize the positioning of the arc extinguish chamber 2. The bump 703 extends to the lower part of the contact surface between the lower part of the insulating member 7 and the static contact 1. The mounting structure utilizes the self structural characteristics of the insulating part to position the static contact, the arc extinguish chamber and the magnetic conduction block, thereby reducing the difficulty in maintaining and debugging the circuit breaker.

Meanwhile, the embodiment also improves the layout structure of the arc extinguishing grid pieces of the arc extinguishing chamber, so that the circuit breaker can effectively elongate, break and extinguish the arc generated when the contact is disconnected in a high-voltage use environment. As shown in fig. 8 and 9, the arc chute plates of the arc chute 2 sequentially include a top arc striking plate 203, an upper arc chute plate group 204, a middle arc chute plate group 205, and a bottom arc chute plate group 206 from top to bottom, and both ends of the arc chute plates of the arc chute 2 are inserted into a bracket 207, as shown in fig. 10 and 11, the top arc striking plate 203 includes a base 203a and an end 203b, the end 203b protrudes from the base 203a and inclines upward, and the base 203a and the end 203b are V-shaped. As shown in fig. 9 and 10, a length of the upper arc-extinguishing grid set 204 facing the movable contact 4 is shorter than a length of the middle arc-extinguishing grid set 205 facing the movable contact 4, the upper arc-extinguishing grid set 204 is distributed in a sector shape from top to bottom from a side facing the movable contact 4 to a side away from the movable contact 4, a curved track formed by a tip 401 of the upper arc-extinguishing grid set 204 facing the movable contact 4 corresponds to a motion track of the movable contact 4, a length of the bottom arc-extinguishing grid set 206 facing the movable contact 4 is shorter than a length of the middle arc-extinguishing grid set 205 facing the movable contact 4, the middle arc-extinguishing grid set 205 and the bottom arc-extinguishing grid set 206 are parallel to each other, and thicknesses of the top arc-striking plate 203 and the bottom arc-extinguishing grid set 206 are greater than thicknesses of the upper arc-extinguishing.

Meanwhile, as shown in fig. 9, a connecting line of end terminals of the middle arc-extinguishing grid set 205 and the bottom arc-extinguishing grid set 206 on the side far from the movable contact 4 is a straight line, a connecting line of end terminals of the upper arc-extinguishing grid set 204 on the side far from the movable contact 4 is a smooth curve, and a joint between the connecting line of end terminals of the middle arc-extinguishing grid set 205 on the side far from the movable contact 4 and the connecting line of end terminals of the upper arc-extinguishing grid set 204 on the side far from the movable contact 4 is.

In order to enable the arc extinguishing chamber to have the best arc extinguishing effect, in this embodiment, the number of the top arc striking plates 203 is preferably 1, the number of the upper arc extinguishing grid plate groups 204 is preferably 5 to 9, the number of the middle arc extinguishing grid plate groups 205 is preferably 11 to 15, and the number of the bottom arc extinguishing grid plate groups 206 is preferably 1 to 3.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an arc control device, it includes static contact (1), and explosion chamber (2) are adorned static contact (1) top, in bars foot (201) of the arc extinguishing bars piece of explosion chamber (2) stretched into gas production cover (3), the break-make of circuit breaker, its characterized in that are being controlled with the disconnection to the joint of moving contact (4) and static contact (1): the gas generating cover (3) comprises a left chamber (301) and a right chamber (302), grid pins (201) of arc extinguishing grid pieces of the arc extinguishing chambers (2) extend into isolation grooves (301a,302a) in the corresponding left chamber (301) and right chamber (302), at least one isolation rib (303, 303 ') is arranged at the bottom of the left chamber (301) and the right chamber (302), and the isolation ribs (303, 303') are positioned between the magnetic conduction block (5) and the static silver points (101) on the static contact (1) to isolate the two from each other.

2. An arc extinguishing device according to claim 1, characterized in that: the distance between the bottom of the groove (202) of the arc extinguishing grid piece of the arc extinguishing chamber (2) and the outer side end (305) of the gas generating cover (3) is not more than 2 mm.

3. An arc extinguishing device according to claim 1, characterized in that: a connecting block (304) is arranged between the bottoms of the left cavity (301) and the right cavity (302), and the connecting block (304) is located on the outer side of the static contact (101) and above the static contact (1).

4. An arc extinguishing device according to claim 1, characterized in that: the moving contact (4) is fixedly provided with a moving contact gas generating element (6), and the moving contact gas generating element (6) is positioned between the moving contact (4) and the static contact (1).

5. An arc extinguishing apparatus according to claim 4, wherein: the moving contact gas generating piece (6) is of a U-shaped structure, and the bottom surface of the U-shaped structure is located between the moving contact (4) and the static contact (1).

6. An arc extinguishing device according to claim 1, characterized in that: the left chamber (301) and the right chamber (302) are integrated.

7. An arc extinguishing device according to claim 1, characterized in that: the insulating part (7) is located on the inner side of the U-shaped bend of the static contact (1), the insulating part (7) covers from the inner side of the U-shaped bend of the static contact (1) and at least extends to the bend position of the upper portion of the static contact (1), and a positioning structure is arranged on the insulating part (7) and can position the arc extinguish chamber (2) and the magnetic conduction block (5) and enable the insulating part (7) to achieve self-limiting when the static contact (1) is installed.

8. An arc extinguishing apparatus according to claim 7, wherein: the positioning structure comprises an insulating part groove (701) formed in the insulating part (7) and used for positioning and installing the magnetic conduction block (5) in the U-shaped bend of the static contact (1), protrusions (702,702') extending upwards from two side edges of the insulating part (7) can position the arc extinguish chamber (2), and a downward convex block (703) formed on at least one side of the insulating part (7) can enable the insulating part (7) to achieve self-limiting when the insulating part (7) is installed in the static contact (1).

9. An arc extinguishing apparatus according to claim 8, wherein: the protrusion (702,702') extends into the arc extinguish chamber (2) to stick to the inner cavity wall of the arc extinguish chamber (2) so as to realize the positioning of the arc extinguish chamber (2).

10. An arc extinguishing apparatus according to claim 8, wherein: the bump (703) extends to the lower part of the contact surface of the lower part of the insulating part (7) and the static contact (1).

11. An arc extinguishing device according to claim 1, characterized in that: the arc extinguishing grid plate of the arc extinguishing chamber (2) sequentially comprises a top arc striking plate (203), an upper arc extinguishing grid plate group (204), a middle arc extinguishing grid plate group (205) and a bottom arc extinguishing grid plate group (206) from top to bottom, the length of one side, facing the moving contact (4), of the upper arc extinguishing grid plate group (204) is shorter than the length of one side, facing the moving contact (4), of the middle arc extinguishing grid plate group (205), the length of one side, facing the moving contact (4), of the upper arc extinguishing grid plate group (204) is distributed in a sector shape from top to bottom, the curve track formed by the end head, facing the moving contact (4), of the upper arc extinguishing grid plate group (204) corresponds to the motion track of the moving contact (4), the length of one side, facing the moving contact (4), of the bottom arc extinguishing grid plate group (206) is shorter than the length of one side, facing the moving contact (, the middle arc-extinguishing grid group (205) and the bottom arc-extinguishing grid group (206) are parallel to each other, and the thicknesses of the top arc-striking plate (203) and the bottom arc-extinguishing grid group (206) are larger than those of the upper arc-extinguishing grid group (204) and the middle arc-extinguishing grid group (205).

12. An arc extinguishing apparatus according to claim 11, wherein: the connecting line of the end of one side of the middle arc-extinguishing grid group (205) and the end of one side of the bottom arc-extinguishing grid group (206) far away from the moving contact (4) is a straight line, the connecting line of the end of one side of the upper arc-extinguishing grid group (204) far away from the moving contact (4) is a smooth curve, and the connecting position of the connecting line of the end of one side of the middle arc-extinguishing grid group (205) far away from the moving contact (4) and the connecting position of the connecting line of the end of one side of the upper arc-extinguishing grid group.

13. An arc extinguishing apparatus according to claim 11, wherein: the top arc striking plate (203) comprises a base part (203a) and an end part (203b), the end part (203b) protrudes out of the base part (203a) and inclines upwards, and the base part (203a) and the end part (203b) are V-shaped.

14. An arc extinguishing apparatus according to claim 11, wherein: the number of the top arc striking plates (203) is 1, the number of the upper arc extinguishing grid groups (204) is 5-9, the number of the middle arc extinguishing grid groups (205) is 11-15, and the number of the bottom arc extinguishing grid groups (206) is 1-3.