CN218274496U

CN218274496U - Small-sized circuit breaker

Info

Publication number: CN218274496U
Application number: CN202221931665.0U
Authority: CN
Inventors: 齐继兵; 南泽斌
Original assignee: Zhejiang Yiteng Electric Technology Co ltd
Current assignee: Zhejiang Yiteng Electric Technology Co ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2023-01-10
Anticipated expiration: 2032-07-26

Abstract

A miniature circuit breaker. The problem of current miniature circuit breaker striking piece striking effect poor is solved. The arc extinguishing chamber comprises a shell, wherein a movable contact piece, a static contact piece and an arc striking piece are arranged in the shell, the movable contact piece is arranged on a contact support, the movable contact piece is provided with a first position attached to the static contact piece and a second position separated from the static contact piece, the arc striking piece comprises a first arc striking part and a second arc striking part, the first arc striking part extends to the second position of the movable contact piece and is arranged behind the static contact piece relative to the movable contact piece, and the second arc striking part extends towards the arc extinguishing chamber. The beneficial effects of the utility model are that, first striking portion extends to movable contact spring second position department and locates the rear of the relative static contact of movable contact spring, avoids the setting that stops for electric arc can get into the explosion chamber arc extinguishing through the striking piece fast when the circuit breaker divides absolutely, makes the product divide absolutely reliable, has reduced spare part, makes product simple structure, low in production cost, long service life.

Description

Small-sized circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus field, concretely relates to miniature circuit breaker.

Background

The Miniature Circuit Breaker (the english name: miniature Circuit Breaker) is also called Miniature Circuit Breaker (Micro Circuit Breaker), is suitable for overload and short Circuit protection of low-voltage lines, and can also be used for infrequent operation switching of lines under normal conditions. The miniature circuit breaker is mainly used in various places such as industrial, commercial, high-rise and civil houses. A miniature circuit breaker typically includes a housing, an operating mechanism, a trip system, a contact system, an arc quenching system, and the like. The operating mechanism drives a moving contact in the contact system to move through the operating handle, so that the miniature circuit breaker is switched on and switched off, and the control on an electric circuit is realized; by sensing the current thermal effect and the magnetic effect, the protection is implemented when faults such as overload, short circuit and the like occur on an electric line. When the electric arc is introduced into the arc extinguish chamber, the electric arc is divided into a plurality of sections by the metal grid sheet in the arc extinguish chamber, and each section of the electric arc generates a near-pole voltage near the metal grid sheet, so that the voltage drop of the whole electric arc is rapidly increased, and the electric arc is extinguished.

In the existing miniature circuit breaker, an arc striking sheet is usually arranged below a breaking position of a moving contact, in order to avoid the over-movement of the moving contact, a baffle is usually arranged at the breaking position of the moving contact, the moving contact can touch the baffle and is limited by the baffle when breaking, and the baffle and the inner wall of a shell are usually in an integrated structure (see an attached drawing 1). However, in the actual production test process, the reliability of the breaking performance of the circuit breaker is verified, the circuit breaker needs to be subjected to an operation short circuit capability test Ics =6KA (refer to IEC60898-1 standard), the breaking condition of the circuit breaker is verified, at the moment, although the arc striking plate is arranged below the movable contact, the arc striking effect can be influenced by the plate blocking in the shell, the electric arc cannot be quickly led to the arc extinguishing chamber to be extinguished, the high energy of the internal temperature of the product is large, the shell at the arc extinguishing chamber is easy to bulge and break down, the baffle is easy to damage in the breaking test process, the service life of the product is influenced, and the standard reaching rate of the product is low during testing.

SUMMERY OF THE UTILITY MODEL

For solving the current poor problem of miniature circuit breaker striking piece striking effect among the background art, the utility model provides a miniature circuit breaker.

The technical scheme of the utility model is that: a miniature circuit breaker comprises a shell, wherein a movable contact piece, a static contact piece and an arc striking piece are arranged in the shell, the movable contact piece is arranged on a contact support, the movable contact piece is provided with a first position attached to the static contact piece and a second position separated from the static contact piece, the arc striking piece comprises a first arc striking part and a second arc striking part, the first arc striking part extends to the second position of the movable contact piece and is arranged behind the static contact piece relative to the movable contact piece, and the second arc striking part extends towards an arc extinguishing chamber.

As a further improvement of the utility model, the first striking portion locate the rear of the relative static contact piece of movable contact piece and laminate mutually with the movable contact piece when the movable contact piece is in the second position.

As a further improvement of the utility model, the first arc striking portion and the second arc striking portion are connected through the third arc striking portion, the inner wall of the shell on support the backup pad that supports the third arc striking portion.

As a further improvement of the utility model, the first striking portion be equipped with the rib, the rib be connected with the bimetallic strip through the portion of bending.

As a further improvement of the utility model, the third arc-striking part is arranged linearly.

As a further improvement, the rib and the portion of bending between be equipped with connecting portion, third run-on portion and connecting portion all laminate mutually with the backup pad, third run-on portion and connecting portion mutually support and form contained angle a, be equipped with the conductive part in the rib of saying, the conductive part be connected with the movable contact spring through the conductor wire.

As a further improvement, the shell in be equipped with elastic component and adjusting screw, the elastic component offset with the portion of bending and mutually support with adjusting screw and be used for adjusting the position of bimetallic strip.

As a further improvement, the shell in which a supporting groove is arranged, the supporting groove is internally provided with a magnetic conduction angle, and the magnetic conduction angle is laminated with the static contact.

As a further improvement, the casing in be equipped with the mounting panel, the mounting panel on be equipped with the support groove, the magnetic conduction angle be V type or U type, the magnetic conduction angle card go into and support the inslot and support the static contact with mutually supporting of the surface of mounting panel.

As a further improvement, the static contact piece is provided with a static contact, and a positioning block convenient for processing the static contact is arranged below the static contact.

The beneficial effects of the utility model are that, first striking portion extends to movable contact spring second position department and locates the rear of the relative static contact of movable contact spring, avoids keeping the setting that blocks for electric arc can get into the explosion chamber arc extinguishing through the striking piece fast when the circuit breaker divides the branch, makes the product branch divide reliably, has reduced spare part, makes product simple structure, low in production cost, long service life.

Drawings

Fig. 1 is a schematic structural diagram of a conventional miniature circuit breaker.

Fig. 2 is a schematic structural diagram of an embodiment of the present invention.

Fig. 3 is a schematic structural view of the housing of fig. 2.

Fig. 4 is a schematic structural view of the arc runner of fig. 2.

Fig. 5 is a schematic structural diagram of the magnetic conduction angle in fig. 2.

Fig. 6 is an enlarged schematic view of the structure at I in fig. 2.

In the figure, 1, a housing; 11. a support plate; 12. a support groove; 13. mounting a plate; 2. a movable contact spring; 3. a static contact piece; 31. a stationary contact; 32. positioning blocks; 4. an arc striking sheet; 41. a first arc striking part; 42. a second arc striking part; 43. a third arc striking part; 44. a reinforcing portion; 45. a bending part; 46. a connecting portion; 47. a conductive portion; 48. a conductive wire; 5. a contact holder; 6. an arc extinguishing chamber; 71. an elastic member; 72. an adjusting screw; 8. a bimetal; 9. and (5) conducting magnetic angle.

Detailed Description

The embodiments of the present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1 and fig. 2-6, a miniature circuit breaker includes a housing 1, a movable contact piece 2, a stationary contact piece 3 and an arc striking piece 4 are arranged in the housing 1, the movable contact piece 2 is arranged on a contact support 5, the movable contact piece 2 has a first position attached to the stationary contact piece 3 and a second position separated from the stationary contact piece 3, the arc striking piece 4 includes a first arc striking portion 41 and a second arc striking portion 42, the first arc striking portion 41 extends to the second position of the movable contact piece 2 and is arranged behind the movable contact piece 2 relative to the stationary contact piece 3, and the second arc striking portion 42 extends towards an arc extinguishing chamber 6. The beneficial effects of the utility model are that, first striking portion extends to movable contact spring second position department and locates the rear of the relative static contact of movable contact spring, avoids the setting that stops for electric arc can get into the explosion chamber arc extinguishing through the striking piece fast when the circuit breaker divides absolutely, makes the product divide absolutely reliable, has reduced spare part, makes product simple structure, low in production cost, long service life.

The first arc-leading part 41 is arranged at the rear part of the movable contact piece 2 relative to the static contact piece 3 and is attached to the movable contact piece 2 when the movable contact piece 2 is at the second position. Therefore, the first arc striking part is directly attached to the movable contact spring without separation in the middle, and arc guiding and arc extinguishing are facilitated.

The first arc ignition part 41 and the second arc ignition part 42 are connected through a third arc ignition part 43, and the inner wall of the shell 1 is supported by a support plate 11 supporting the third arc ignition part 43. Specifically, the third arc ignition portion 43 is linearly disposed. The third linear arc striking part enables the distance from the arc striking point to the third arc striking part to be shorter, and the arc striking effect of the product is better.

The first arc ignition part 41 is provided with a reinforcing part 44, and the reinforcing part 44 is connected with the bimetallic strip 8 through a bent part 45. Specifically, a connecting portion 46 is arranged between the reinforcing portion 44 and the bending portion 45, the third arc-leading portion 43 and the connecting portion 46 are both attached to the supporting plate 11, the third arc-leading portion 43 and the connecting portion 46 are mutually matched to form an included angle a, a conductive portion 47 is arranged on the reinforcing portion, and the conductive portion 47 is connected with the movable contact 2 through a conductive wire 48. The setting of rib makes first striking portion intensity high, and first striking portion is difficult to warp, is convenient for set up the conductive part simultaneously, is convenient for the wiring. The third arc striking part and the connecting part form an included angle, so that the installation of the arc striking piece is convenient, and the fixation is convenient and reliable.

An elastic piece 71 and an adjusting screw 72 are arranged in the shell 1, and the elastic piece 71 is abutted against the bending part 45 and is matched with the adjusting screw 72 for adjusting the position of the bimetallic strip 8. The elastic piece and the adjusting screw are arranged, the position of the bimetallic strip can be adjusted by rotating the adjusting screw, so that the position of the bimetallic strip is adjusted, and the breaking of the movable contact spring is controlled by the deformation of the bimetallic strip.

A supporting groove 12 is arranged in the shell 1, a magnetic conduction angle 9 is arranged in the supporting groove 12, and the magnetic conduction angle 9 is attached to the static contact piece 3. Specifically, casing 1 in be equipped with mounting panel 13, mounting panel 13 on be equipped with support groove 12, magnetic conduction angle 9 be V type or U type, magnetic conduction angle 9 block in support groove 12 and support static contact 3 with the surface of mounting panel 13 mutually supports. The arrangement of the magnetic conduction angle is convenient for the installation and the limitation of the static contact, and the arc conduction and the arc extinction at the static contact are improved. The magnetic angle is led in the setting of supporting groove quick installation, dismantlement of being convenient for, simple structure, convenient operation.

The static contact 3 is provided with a static contact 31, and a positioning block 32 which is convenient for processing the static contact 31 is arranged below the static contact 31. The static contact is convenient to contact with the movable contact piece, and the installation and the processing of the static contact are convenient due to the arrangement of the positioning block, so that the structure is simple.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the 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 the like 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," "connected," and "connected" are to be construed 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. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The skilled person should understand that: although the present invention has been described according to the above embodiments, the inventive idea is not limited to this embodiment, and any application of the inventive idea is also included in the scope of the patent right protection.

Claims

1. A small-sized circuit breaker comprises a shell (1) and is characterized in that a movable contact piece (2), a static contact piece (3) and an arc striking piece (4) are arranged in the shell (1), the movable contact piece (2) is arranged on a contact support (5), the movable contact piece (2) is provided with a first position attached to the static contact piece (3) and a second position separated from the static contact piece (3), the arc striking piece (4) comprises a first arc striking part (41) and a second arc striking part (42), the first arc striking part (41) extends to the second position of the movable contact piece (2) and is arranged behind the movable contact piece (2) relative to the static contact piece (3), and the second arc striking part (42) extends towards an arc extinguishing chamber (6).

2. A miniature circuit breaker as claimed in claim 1, wherein said first arcing part (41) is arranged behind said movable contact (2) with respect to said stationary contact (3) and abuts said movable contact (2) when said movable contact (2) is in said second position.

3. A miniature circuit breaker according to claim 1, characterized in that said first arc ignition portion (41) and said second arc ignition portion (42) are connected by a third arc ignition portion (43), and said inner wall of said case (1) supports a support plate (11) for supporting said third arc ignition portion (43).

4. A miniature circuit breaker according to claim 3, wherein said first arcing section (41) is provided with a reinforcing portion (44), said reinforcing portion (44) being connected to said bimetal (8) by means of a bent portion (45).

5. A miniature circuit breaker according to claim 3, wherein said third arcing section (43) is arranged linearly.

6. A miniature circuit breaker according to claim 4, characterized in that a connecting portion (46) is provided between said reinforcing portion (44) and said bent portion (45), said third arc-guiding portion (43) and said connecting portion (46) are both attached to said support plate (11), said third arc-guiding portion (43) and said connecting portion (46) are fitted to each other to form an included angle a, said reinforcing portion is provided with a conductive portion (47), said conductive portion (47) is connected to said movable contact (2) through a conductive wire (48).

7. A miniature circuit breaker according to claim 4, characterized in that an elastic member (71) and an adjusting screw (72) are provided in said housing (1), said elastic member (71) is abutted against said bent portion (45) and is mutually engaged with said adjusting screw (72) for adjusting the position of said bimetal (8).

8. A miniature circuit breaker as claimed in claim 1, wherein said housing (1) is provided with a support groove (12), said support groove (12) is provided with a magnetic conduction angle (9), said magnetic conduction angle (9) is attached to said static contact (3).

9. A miniature circuit breaker according to claim 8, characterized in that a mounting plate (13) is provided in said housing (1), said mounting plate (13) is provided with said support groove (12), said magnetic conduction angle (9) is V-shaped or U-shaped, said magnetic conduction angle (9) is clamped in the support groove (12) and is mutually matched with the outer surface of the mounting plate (13) to support the static contact (3).

10. The miniature circuit breaker according to claim 1, wherein said stationary contact (3) is provided with a stationary contact (31), and a positioning block (32) for facilitating the processing of the stationary contact (31) is disposed below said stationary contact (31).