CN214254308U

CN214254308U - Structure for prolonging electric service life of circuit breaker

Info

Publication number: CN214254308U
Application number: CN202023069754.2U
Authority: CN
Inventors: 代文华; 杨卫
Original assignee: Shanghai Liangxin Electrical Co Ltd
Current assignee: Shanghai Liangxin Electrical Co Ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-09-21
Anticipated expiration: 2030-12-18

Abstract

The utility model provides an improve structure of circuit breaker electric life, it includes base (1) and face lid (2), static contact (3) fixed mounting in base (1) and the cavity that face lid (2) formed, its characterized in that: the corresponding matching position of the first arc-isolating rib (1a) on the inner side surface of the base (1) and the static contact (3) is provided with a first concave part (1a01), the corresponding matching position of the second arc-isolating rib (2a) on the inner side surface of the face cover (2) and the static contact (3) is provided with a second concave part (2a01), and the first concave part (1a01) and the second concave part (2a01) can be used for increasing creepage distance. Through improving the relevant structure of circuit breaker for electric arc transfer speed avoids the scaling loss of sound contact, reduces base/lid protruding muscle carbonization degree.

Description

Structure for prolonging electric service life of circuit breaker

Technical Field

The utility model belongs to the technical field of the circuit breaker, specifically say so and relate to an improve structure in circuit breaker electric life-span.

Background

The circuit breaker is an important part in a distribution electrical appliance, and is used for an industrial low-voltage power system for connecting and disconnecting current in a power grid circuit and protecting a line and power supply equipment from damage caused by faults such as overload, undervoltage, short circuit, single-phase grounding and the like.

The service life of the circuit breaker is easily reached due to various reasons such as load impact, excessive times of opening and closing heavy current or long-time operation under the condition of heavy current, and the like, so that the heat deformation, abrasion, oxidation and the like of static and movable contacts in the circuit breaker are caused, if the switch equipment is not overhauled or replaced in time, the effects of the circuit breaker are lost due to poor contact of the static and movable contacts in the switch, and even the accidents such as explosion, fire and the like of the circuit breaker are caused due to arc discharge or overlong arcing time. This will affect the operational safety of the entire distribution network. The inherent electrical life of the circuit breaker, namely the on-off times of rated short-circuit current can reach 30-50 times. When the breaker is in use, if the times of opening and closing the short-circuit current exceed the rated times when the breaker leaves a factory, the static and moving contacts of the breaker are electrically abraded to reach the use limit value. The circuit breaker breaks short-circuit current for too long time, make the quiet of circuit breaker, the arc of drawing of moving contact, the time of arcing too long, lead to the contact because of generating heat, oxidation, electrical wear, deformation etc. seriously influence the electric life of circuit breaker, current circuit breaker generally adopts shell, moving contact, static contact, striking plate, magnetic conduction piece, separate arc piece, combination formation electric arc passageway and arc extinguishing system such as explosion chamber, the striking plate shifts electric arc to the explosion chamber and reaches the purpose of extinguishing electric arc, thereby realize protecting the sound contact, the electric life of extension circuit breaker.

However, in the existing circuit breaker, the arc is transferred to the arc extinguish chamber through the arc striking sheet to extinguish the arc, so that the moving and static contacts are protected, and the arc generated between the moving and static contacts is transferred too slowly or not transferred in the method for prolonging the electric service life of the circuit breaker, so that the moving and static contacts are burnt more, and the circuit breaker cannot be electrified and fails; and the arc transfer is slow, so that the withstand voltage performance of the carbonized convex rib of the circuit breaker base/surface cover is difficult to reach the standard.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem that the arc generated between the moving and static contacts of the existing circuit breaker is transferred too slowly or not, so that the moving and static contacts are burnt more and the circuit breaker is not electrified; and arc shifts slowly, leads to the defect that withstand voltage can't be up to standard after the protruding muscle carbonization of circuit breaker base/face lid, provides a structure that improves circuit breaker electric life, through improving circuit breaker relevant structure for electric arc shifts speed, avoids the scaling loss of sound contact, reduces base/lid protruding muscle carbonization degree.

Technical scheme

In order to realize the technical purpose, the utility model provides a pair of improve structure of circuit breaker electric life, it includes base and face lid, and static contact fixed mounting is in the cavity that base and face lid formed, its characterized in that: the first arc-isolating rib on the inner side surface of the base is provided with a first concave part at the corresponding matching position with the fixed contact, the second arc-isolating rib on the inner side surface of the surface cover is provided with a second concave part at the corresponding matching position with the fixed contact, and the first concave part and the second concave part can be used for increasing the creepage distance.

Furthermore, one end of the insulating sheet is arranged between the moving contact and the bimetallic strip, and the other end of the insulating sheet extends to the position between the arc striking sheet and the bimetallic strip;

the other end of the insulating sheet is tightly close to the arc striking sheet and used for sealing the gap between the moving contact and the periphery of the arc striking sheet. By adopting the structure, the electric arc can transfer the electric arc channel into the arc extinguish chamber more easily.

Further, the arc striking piece extends upwards towards the bending part of the movable contact to form an arc striking angle.

Furthermore, a convex rib is arranged on the surface of the arc striking plate facing one side of the arc extinguishing chamber to reduce the distance between the arc striking plate and the arc striking end of the static contact. By adopting the structure, the area of the arc root can be reduced, the diameter of the electric arc is further reduced, and the electric arc transfer is facilitated.

Further, the distance between one end of the arc striking angle, which is opposite to the movable contact, and the movable contact is not more than 3 mm. With this structure, the arc is favorably transferred.

Further, the arc striking angle is in an inverted U shape.

Further, a gap between one side surface of the first concave portion and the second concave portion corresponding to the fixed contact and the fixed contact is not less than 0.2 mm.

Furthermore, the two sides of the first arc isolating rib and the second arc isolating rib are rounded.

Further, the outer side surface of the static contact mounting end is lower than the highest point or line of the bent end surface of the static contact mounting end, and the tail end of the arc angle of the static contact extends towards the arc extinguish chamber. By adopting the structure, the arc generated when the moving contact and the static contact are switched off can be transferred to the arc channel; the arc generated when the moving contact and the static contact are switched off is transferred to the arc channel, so that the arc enters the arc extinguish chamber.

Advantageous effects

The utility model provides a structure for prolonging the electric service life of a circuit breaker, a groove is added on a convex rib of a base/a surface cover, and the creepage distance is increased; the arc striking angle is improved to be close to the moving contact, and convex ribs are added; the insulating sheet seals the arc channel, and the arc is easy to transfer into the arc channel to enter the arc extinguish chamber; the shape of the arc striking angle of the static contact is changed, so that the arc generated when the movable contact and the static contact are disconnected can be transferred into an arc channel, and then enters an arc extinguish chamber; the whole improvement is beneficial to the electric arc to quickly move away from the moving contact and the static contact, reduces the burning loss of the moving contact and the static contact, and reduces the carbonization degree of the convex rib of the base/the surface cover.

Drawings

Fig. 1 is a schematic diagram of an internal structure of a circuit breaker according to embodiment 1 of the present invention.

Fig. 2 is a schematic view of a position of an arc rib in embodiment 1 of the present invention.

Fig. 3 is a schematic diagram of a first concave portion, a second concave portion and the position of the static contact in embodiment 1 of the present invention.

Fig. 4 is a schematic view of the installation of the insulating sheet in embodiment 1 of the present invention.

Fig. 5 is a schematic view of the position of the bead on the arc striking angle in embodiment 1 of the present invention.

Fig. 6 is a schematic view of the position of the boss on the arc striking angle in embodiment 1 of the present invention.

Fig. 7 is a schematic view of the arc angle end position of the static contact in embodiment 1 of the present invention.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific 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 is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.

Example 1

As shown in fig. 1, in the improved structure of the electrical service life of the circuit breaker provided in this embodiment, a housing W of the circuit breaker includes the base 1 and the face cover 2, and the fixed contact 3 is fixedly installed in a cavity formed by the base 1 and the face cover 2, as shown in fig. 2 and 3, a first concave portion 1a01 is provided at a matching position where the first arc-isolating rib 1a on an inner side surface of the base 1 corresponds to the fixed contact 3, and a second concave portion 2a01 is provided at a matching position where the second arc-isolating rib 2a on an inner side surface of the face cover 2 corresponds to the fixed contact 3. The first concave part 1a01 and the second concave part 2a01 are recessed planes, and a gap between one side surface of the first concave part 1a01 and the second concave part 2a01 corresponding to the fixed contact 3 and the fixed contact 3 is not less than 0.2 mm. The first recess 1a01 and the second recess 2a01 can be used to increase creepage distance.

As shown in fig. 1 and 6, a boss B is provided on the inner side surface of the case of the circuit breaker at a position corresponding to the arc extinguishing chamber 8. The boss B comprises a first boss 1B and a second boss 2B, specifically, the first boss 1B is arranged on the inner side surface of the base 1 corresponding to the arc extinguish chamber 8, and the second boss 2B is arranged on the inner side surface of the surface cover 2 corresponding to the arc extinguish chamber 8. In this embodiment, the boss 1b and the boss 2b are preferably 2 each, and the boss 1b and the boss 2b are located at the left and right sides of the arc extinguish chamber 8 and are symmetrically arranged. The boss B enables the arc extinguishing chamber 8 to move forward and be tighter, prevents the arc extinguishing grid sheet from directly contacting with the arc nozzle, prevents the arc extinguishing grid sheet from being blocked due to the fact that the arc nozzle is scalded by plastics of the arc nozzle, and enables an arc channel to be smooth and easy to discharge;

as shown in fig. 1, the width of the arc spout 9 on the outer side of the tail of the arc extinguishing chamber 8 in the inner cavity of the housing of the circuit breaker is not less than 1mm, and the depth is not less than 2mm for smooth discharge of the arc.

As shown in fig. 1 and 4, one end of the insulating sheet 4 is installed between the movable contact 5 and the bimetallic strip 6, and the other end extends to a position between the arc striking sheet 7 and the bimetallic strip 6; the other end of the insulation sheet 4 is abutted against the arc striking sheet 7 to seal the gap between the movable contact 5 and the periphery of the arc striking sheet 7. The insulating sheet seals the arc channel, and the arc is easy to transfer into the arc extinguishing chamber.

As shown in fig. 1 and 5, the arc ignition piece 7 extends upward toward the bent portion of the movable contact 5 to form an arc ignition angle 701. The arc striking angle 701 is inverted U-shaped, and a convex rib 7a is arranged on the surface of the arc striking plate 7 facing one side of the arc extinguishing chamber 8 to reduce the distance between the arc striking plate 7 and the arc striking end 3a of the static contact 3 so as to reduce the area of an arc root, further reduce the diameter of an electric arc and facilitate the transfer of the electric arc; the distance between one end of the arc ignition angle 701 opposite to the movable contact 5 and the movable contact 5 is not more than 3 mm. As shown in fig. 1 and 7, an outer side surface 3b of the mounting end of the static contact 3 is lower than a highest point or a line of a curved end surface 3c of the static contact, an arc angle end of the static contact 3 extends towards the arc extinguish chamber 8, and a minimum distance between an arc angle end 3d of the static contact 3 and a V-shaped end 8a of an arc extinguishing grid sheet at the top end of the arc extinguish chamber 8 is not less than 0.3 mm. The arc generated when the movable and static contacts are disconnected is transferred to the arc channel; the arc generated when the moving contact, the static contact and the contact are disconnected is transferred to the arc channel, so that the arc enters the arc extinguish chamber.

Example 2

In another embodiment of the present invention, the boss B only comprises a boss 1B disposed on the inner side surface of the base 1 corresponding to the arc extinguish chamber 8. The boss B enables the arc extinguishing chamber 8 to move forward and be tighter, prevents the arc extinguishing grid sheet from directly contacting with the arc nozzle, prevents the arc extinguishing grid sheet from being blocked due to the fact that the arc nozzle is scalded by plastics of the arc nozzle, and enables an arc channel to be smooth and easy to discharge; the other structure is the same as the embodiment.

Example 3

The utility model also provides an embodiment, boss 1b and boss two 2b are located 8 left and right sides of explosion chamber and are diagonal arrangement. The number of the

bosses

1b and 2b is preferably 1. The other structure is the same as in embodiment 1.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. The utility model provides an improve structure of circuit breaker electric life, it includes base (1) and face lid (2), static contact (3) fixed mounting in base (1) and the cavity that face lid (2) formed, its characterized in that: the corresponding matching position of the first arc-isolating rib (1a) on the inner side surface of the base (1) and the static contact (3) is provided with a first concave part (1a01), the corresponding matching position of the second arc-isolating rib (2a) on the inner side surface of the face cover (2) and the static contact (3) is provided with a second concave part (2a01), and the first concave part (1a01) and the second concave part (2a01) can be used for increasing creepage distance.

2. The structure for improving the electric life of a circuit breaker according to claim 1, wherein: one end of the insulating sheet (4) is arranged between the moving contact (5) and the bimetallic strip (6), and the other end extends to a position between the arc striking sheet (7) and the bimetallic strip (6);

the other end of the insulation sheet (4) is abutted against the arc striking sheet (7) to seal the gap at the periphery of the moving contact (5) and the arc striking sheet (7).

3. The structure for improving the electric life of a circuit breaker according to claim 1, wherein: the arc striking piece (7) extends upwards towards the bending part of the movable contact (5) to form an arc striking angle (701).

4. The structure for improving the electric life of a circuit breaker according to claim 1, wherein: and a convex rib (7a) is arranged on the surface of the arc striking plate (7) facing one side of the arc extinguishing chamber (8) and used for reducing the distance between the arc striking plate (7) and the arc striking end (3a) of the static contact (3).

5. The structure for improving the electric life of a circuit breaker according to claim 3, wherein: the distance between one end of the arc ignition angle (701) opposite to the moving contact (5) and the moving contact (5) is not more than 3 mm.

6. The structure for improving the electric life of a circuit breaker according to claim 3, wherein: the arc ignition angle (701) is in an inverted U shape.

7. The structure for improving the electric life of a circuit breaker according to claim 1, wherein: and the gap between one side surface of the first concave part (1a01) and the second concave part (2a01) corresponding to the static contact (3) and the static contact (3) is not less than 0.2 mm.

8. The structure for improving the electric life of a circuit breaker according to claim 1, wherein: and two sides of the first arc-isolating rib (1a) and the second arc-isolating rib (2a) are rounded.

9. The structure for improving the electric life of a circuit breaker according to claim 1, wherein: the outer side surface (3b) of the mounting end of the static contact (3) is lower than the highest point or line of the bent end surface (3c), and the arc angle tail end of the static contact (3) extends towards the arc extinguish chamber (8).