CN112885659A

CN112885659A - Big-opening-distance double-breakpoint circuit breaker

Info

Publication number: CN112885659A
Application number: CN202110292245.6A
Authority: CN
Inventors: 邓卫新; 令狐绍江; 卢山念; 葛世伟; 袁辉; 高腾飞; 臧卫; 陆俊谦
Original assignee: Zhejiang Tengen Electric Co Ltd
Current assignee: Zhejiang Tengen Electric Co Ltd
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2021-06-01

Abstract

The invention provides a large-opening-distance double-breakpoint circuit breaker, which comprises: the contact assembly is arranged on the shell and comprises a moving contact and a static contact, and the static contact and the moving contact can be contacted or disconnected; the contact cover is arranged on the static contact and is provided with an air guide channel which can generate gas and blow an arc to the arc extinguishing assembly, and the circuit breaker improves arc striking force and arc blowing force, thereby effectively improving arc extinguishing efficiency.

Description

Big-opening-distance double-breakpoint circuit breaker

Technical Field

The invention relates to the field of low-voltage power distribution, in particular to a large-opening-distance double-breakpoint circuit breaker.

Background

At present, all install the explosion chamber that is used for the arc extinguishing in the circuit breaker on the market, the position that the driven contact of electric arc and static contact contacted gets into in the explosion chamber, and the explosion chamber is simple comprises a plurality of arc extinguishing bars piece and the arc extinguishing chamber of living with all arc extinguishing bars piece wraps up, and electric arc is separated into a plurality of short arcs by a plurality of arc isolating bars piece under the promotion of the magnetic field in the explosion chamber and fluid effect, reaches the effect of arc extinguishing, and adopts this kind of arc extinguishing mode, the arc extinguishing effect that reaches is general.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect of common arc extinguishing effect of the arc extinguishing chamber in the prior art, and provide the large-opening-distance double-breakpoint circuit breaker with good arc extinguishing effect.

Therefore, the invention provides a large-opening-distance double-breakpoint circuit breaker, which comprises a contact assembly, a fixed contact and a movable contact, wherein the contact assembly is arranged on a shell and comprises the movable contact and the fixed contact;

the contact cover is arranged on the static contact and is provided with an air guide channel which can generate gas and blow the electric arc to the arc extinguishing assembly.

Further: the arc extinguishing subassembly includes the arc extinguishing bars piece, is used for holding the explosion chamber of arc extinguishing bars piece and with the gas outlet of explosion chamber UNICOM, blocking face and air guide face have been seted up to the contact cover, the air guide face is used for in the gas blowing entering arc extinguishing chamber with higher speed, blocking the face and being used for preventing gaseous withdrawal.

Further: the blocking surface is a vertical surface, and the air guide surface is an air guide inclined surface extending towards the arc extinguish chamber.

Further: the inside arc ignition angle that is provided with of air guide channel, arc ignition angle department are provided with draw-in groove and striking piece, and the striking piece card is located inside the draw-in groove and is laminated with the air guide inclined plane, the striking piece is used for guiding the air-blowing direction to blow to the explosion chamber.

Further: and a clamping groove is arranged at the arc striking piece and is clamped with the arc striking piece.

Further: the static contact is provided with a contact, the contact is used for contacting with the moving contact, and a gas blocking rib for preventing air flow and electric arc from jumping backwards extends on the position of the side wall of the shell.

Further: and a horn mouth is formed between the air blocking rib and the arc striking sheet.

Further: and a silver coating film for sealing the bottom of the air guide channel is arranged at the contact, and the silver coating film covers the outside of the contact.

Further: and the contact cover is provided with a reinforcing rib for preventing the contact cover from cracking.

Further: the static contact comprises an extension section, a bending section and a connecting section, the contact is arranged at the connecting section, and the connecting section is arranged adjacent to the upper panel or the lower panel of the shell.

The technical scheme of the invention has the following advantages:

1. according to the large-opening-distance double-breakpoint circuit breaker provided by the invention, the contact cover plays a role in shielding the static contact to prevent the static contact from being ablated due to electric arc fleeing, and on the other hand, the contact cover is made of a gas generation material, so that a large amount of gas can be generated, and due to the arrangement of the gas guide channel, when the static and dynamic contacts are disconnected, the gas guide channel can generate gas and push the electric arc to move towards the direction of the arc extinguish chamber, so that the stagnation of the electric arc is reduced, the time of the electric arc entering the arc extinguish grid piece is accelerated, and the.

2. According to the large-opening-distance double-breakpoint circuit breaker, the inclined surface and the vertical surface are arranged on the contact cover, the vertical surface can prevent gas from withdrawing, and the inclined surface can accelerate gas to blow to the arc extinguish chamber, so that the gas blowing speed is improved.

3. The large-opening-distance double-breakpoint circuit breaker provided by the invention can effectively guide the blowing direction to blow towards the arc extinguish chamber through the arrangement of the arc striking sheet.

4. According to the large-opening-distance double-breakpoint circuit breaker, the side wall of the accommodating cavity is provided with the gas blocking rib, and the gas blocking rib can effectively prevent air flow and electric arc from flowing backwards.

5. According to the large-opening-distance double-breakpoint circuit breaker, the gas blocking rib and the arc striking piece form a horn mouth, the arc extinguishing chamber is clamped in the middle, and arc blowing and arc striking are facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic view of the overall structure of the large-opening-distance double-break-point circuit breaker;

fig. 2 is a schematic perspective view of the moving contact in fig. 1 with the moving contact removed;

FIG. 3 is a schematic perspective view of FIG. 1 at another angle;

FIG. 4 is a schematic perspective view of the contact shell of FIG. 1 with the contact shell removed;

FIG. 5 is a schematic perspective view of a contact shell;

FIG. 6 is a diagram of the position relationship between the contact cover and the arc chute;

FIG. 7 is a schematic perspective view of another side of the contact shell;

FIG. 8 is a cross-sectional view of a contact shell.

Reference numerals: 1. a contact assembly; 11. a moving contact; 12. static contact; 13. a contact; 2. a housing; 3. a contact cover; 31. an air guide channel; 32. a blocking surface; 33. a gas-guiding surface; 4. an arc extinguishing assembly; 41. arc extinguishing grid pieces; 42. an arc extinguishing chamber; 43. an air outlet; 5. a card slot; 51. an arc striking sheet; 6. a gas barrier rib; 61. coating a silver film; 7. reinforcing ribs; 8. an extension section; 81. bending the section; 82. and (4) connecting the sections.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Examples

The embodiment provides a large-opening-distance double-breakpoint circuit breaker, which comprises a contact assembly 1, a fixed contact 12 and a movable contact 11, wherein the contact assembly 1 is arranged on a shell 2 and comprises the movable contact 12 and the fixed contact 12, and the fixed contact 12 and the movable contact 11 can be contacted or disconnected; the contact cover 3 is arranged on the static contact 12 and is provided with an air guide channel 31 which can generate gas and blow the electric arc to the arc extinguishing component 4.

The specific improvement is as follows: as shown in fig. 1: the moving contact 11 and the static contact 12 are arranged in the shell 2, the static contact 12 is fixedly arranged in the shell 2, when the electric appliance is powered on, the moving contact 11 is inserted into the contact cover 3 and connected with the static contact 12, when the electric appliance is disconnected, the moving contact 11 can be separated from the static contact 12, a large amount of electric arcs are generated in the separation process, in the electric arc generation process, the temperature of the contact cover 3 rises, a large amount of gas is generated, the gas pushes the electric arcs to be conducted in the arc extinguish chamber 42, the advantages of the prior art are achieved, after the disconnection process, the contact cover 3 generates the gas, the electric arcs are pushed to enter the arc extinguish chamber 42.

On the basis of the above-described embodiment: arc extinguishing subassembly 4 includes arc extinguishing bars piece 41, be used for holding arc extinguishing bars piece 41's explosion chamber 42 and with the gas outlet 43 of explosion chamber 42 UNICOM, blocking face 32 and air guide face 33 have been seted up to contact cover 3, air guide face 33 is used for accelerating the gas blowing and gets into in the explosion chamber 42, blocking face 32 is used for preventing gaseous withdrawal.

The specific improvement is as follows: as shown in fig. 1: after the circuit breaker is disconnected, the electric arc rapidly enters the arc extinguishing chamber 42 due to the air blowing effect of the contact cover 3, then is extinguished through the arc extinguishing grid piece 41, and finally is exhausted through the air outlet 43.

The specific improvement is as follows: as shown in fig. 5-8: the contact cover 3 is provided with a blocking surface 32 and a gas guide surface 33, the blocking surface 32 can effectively block gas from withdrawing, and the gas guide surface 33 can be arranged in an inclined plane, so that gas blowing can be effectively accelerated to enter the arc extinguish chamber 42.

On the basis of the above-described embodiment: the inside arc ignition angle that is provided with of air guide channel 31, arc ignition angle department is provided with draw-in groove 5, arc ignition angle department is provided with arc ignition piece 51, and arc ignition piece 51 card is established with draw-in groove 5 inside, arc ignition piece 51 and the laminating of air guide inclined plane, arc ignition piece 51 is used for guiding the air-blowing direction to blow to explosion chamber 42.

The specific improvement is as follows: as shown in fig. 6: the clamping groove 5 is formed in the air guide channel 31, the shape of the arc striking piece 51 arranged in the clamping groove 5 is attached to the air guide inclined plane, the arc striking piece 51 has the effect that electric arcs can be effectively guided to enter the arc extinguishing chamber 42, and the arc striking piece 51 is clamped in the clamping groove of the contact cover, so that the contact cover has the advantages of being simple in structure and fast and convenient to assemble.

On the basis of the above-described embodiment: the fixed contact 12 is provided with a contact 13, and the contact 13 is used for contacting with the fixed contact 12.

The specific improvement is as follows: as shown in fig. 4: the contact 13 is disposed on the stationary contact 12 and contacts with the movable contact 11, and the contact 13 may be made of a metal material with high conductivity.

On the basis of the above-described embodiment: the position of the side wall of the shell 2 is extended with a gas blocking rib 6 for preventing air flow and electric arc from channeling, and a horn mouth is formed between the gas blocking rib 6 and the arc striking sheet 51.

The specific improvement is as follows: the gas blocking rib 6 and the arc striking plate form a horn mouth, and the arc extinguishing chamber 42 is clamped in the middle, so that arc striking and arc blowing are facilitated.

On the basis of the above-described embodiment: the contact is provided with a silver coating 61 for closing the air guide channel 31, and the silver coating 61 covers the outside of the contact 13.

The specific improvement is as follows: the contact 13 is covered by a silver coating film, or the whole contact 13 is made of silver material, so that one contact 13 can have good conductivity; the two can seal one end of the air guide channel 31 provided with the contact 13 (the sealing means that the area of the contact almost occupies the bottom position of the air guide channel 31), so that one end of the air guide channel 31 is sealed, after the breaking, the contact cover 3 generates gas, the air pressure at one end of the contact 13 is increased, the air pressure at the arc extinguishing chamber 42 is lower than the air pressure at the contact 13, and the air pressure generated by the contact cover 3 can push the electric arc to the arc extinguishing chamber 42.

On the basis of the above-described embodiment: the contact cover 3 is provided with a reinforcing rib 7 for preventing the contact cover 3 from cracking.

The specific improvement is as follows: through the arrangement of the reinforcing ribs 7, the contact cover 3 can be effectively prevented from being blown apart by the atmospheric air.

On the basis of the above-described embodiment: the fixed contact 12 includes an extending section 8, a bending section 81, and a connecting section 82, and the connecting section 82 is disposed adjacent to the upper panel or the lower panel of the housing 2.

The specific improvement is as follows: as shown in fig. 1-4: the static contact 12 comprises an extension section 8, a bending section 81 and a connecting section 82, the contact is arranged at the position of the connecting section 82, and the connecting section 82 is positioned on the upper panel or the lower panel of the shell 2, so that the original opening distance can be doubled, and the breaking requirement of high voltage is met.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. The utility model provides a big double break point circuit breaker which characterized in that: comprises that

The contact assembly (1) is arranged on the shell (2) and comprises a moving contact (11) and a static contact (12), and the static contact (12) and the moving contact (11) can be contacted or disconnected;

the contact cover (3) is arranged on the static contact (12) and is provided with an air guide channel (31) which can generate gas and blow the electric arc to the arc extinguishing component (4).

2. The large-opening-distance double-breakpoint circuit breaker according to claim 1, wherein: arc extinguishing subassembly (4) including arc extinguishing bars piece (41), be used for holding arc extinguishing bars piece (41) arc extinguishing chamber (42) and with gas outlet (43) of arc extinguishing chamber (42) UNICOM, blocking face (32) and air guide face (33) have been seted up in contact cover (3), air guide face (33) are used for accelerating the gas and blow the arc and get into in arc extinguishing chamber (42), blocking face (32) are used for preventing gaseous withdrawal.

3. A large opening distance double break point circuit breaker according to claim 2, characterized in that: the blocking surface (32) is a vertical surface, and the air guide surface (33) is an air guide inclined surface extending towards the arc extinguish chamber (42).

4. A large opening double break point circuit breaker according to any one of claims 1-3, characterized in that: the gas guide channel (31) inside is provided with the run-on angle, and the run-on angle department is provided with draw-in groove (5) and run-on piece (51), and run-on piece (51) card is located draw-in groove (5) inside and is laminated with the gas guide inclined plane, run-on piece (51) are used for guiding the air-blowing direction to blow to explosion chamber (42).

5. The large-opening-distance double-breakpoint circuit breaker according to claim 4, wherein: a clamping groove (5) is formed in the arc striking piece, and the clamping groove (5) is connected with the arc striking piece (51) in a clamping mode.

6. The large-opening-distance double-breakpoint circuit breaker according to claim 5, wherein: the static contact (12) is provided with a contact (13), the contact (13) is used for contacting with the dynamic contact (11), and a gas blocking rib (6) for preventing air flow and electric arc from back channeling extends on the side wall of the shell (2).

7. The large-opening-distance double-breakpoint circuit breaker according to claim 6, wherein: and a horn mouth is formed between the air blocking rib (6) and the arc striking sheet (51).

8. The large-opening-distance double-breakpoint circuit breaker according to claim 7, wherein: and a silver coating film for closing the bottom of the air guide channel (31) is arranged at the contact, and the silver coating film is covered outside the contact (13).

9. The large-opening-distance double-breakpoint circuit breaker according to claim 8, wherein: and the contact cover (3) is provided with a reinforcing rib (7) for preventing the contact cover (3) from cracking.

10. A large opening distance double break point circuit breaker according to claim 9, characterized in that: the static contact (12) comprises an extension section (8), a bending section (81) and a connection section (82), the contact (13) is arranged at the connection section (82), and the connection section (82) is arranged close to the upper panel or the lower panel of the shell (2).