CN213936075U

CN213936075U - Small-sized circuit breaker

Info

Publication number: CN213936075U
Application number: CN202023087596.3U
Authority: CN
Inventors: 谢卫锋
Original assignee: Zhejiang Junlang Electric Automation Co ltd
Current assignee: Zhejiang Junlang Electric Automation Co ltd
Priority date: 2020-12-19
Filing date: 2020-12-19
Publication date: 2021-08-10
Anticipated expiration: 2030-12-19

Abstract

The utility model discloses a miniature circuit breaker, which comprises a shell, an arc extinguish chamber and an electromagnetic tripping device; the electromagnetic tripping device comprises a magnetic yoke, a coil framework, an electromagnetic coil, a movable iron core, a static iron core, an ejector rod and a spring, wherein the coil framework is fixed in the magnetic yoke, the electromagnetic coil is wound on the coil framework, one end of the electromagnetic coil is connected with a static contact, the other end of the electromagnetic coil is connected with a lug plate, the static iron core is fixed at one end, close to a moving contact, in the coil framework, the movable iron core is arranged at the other end of the coil framework, the static iron core is in a hollow shape with a central through hole, the ejector rod is movably arranged in the static iron core, one end of the ejector rod is connected with the movable iron core in a matched mode, the root of the static contact is provided with an electric connecting piece, the cross section of the electromagnetic coil is rectangular, the electric connecting piece and the lug plate are welded with the side face where the long side of the rectangle is located, the welding area is larger than the cross section area of the electromagnetic coil, and the root of the static contact is fixedly connected with the magnetic yoke. The utility model provides a miniature circuit breaker's is rational in infrastructure, is favorable to reducing the temperature rise, and structural practicability is strong.

Description

Small-sized circuit breaker

Technical Field

The utility model relates to a circuit breaker, concretely relates to miniature circuit breaker.

Background

In the electromagnetic tripping device applied to the miniature circuit breaker in the prior art, an electromagnetic coil needs to be connected into a main line (two ends of the electromagnetic coil are respectively welded with an external lug and a static contact), when the main line is short-circuited, the current in the electromagnetic coil is increased to generate a magnetic field to drive an internal movable iron core to move, and the circuit breaker is driven to trip and break through the movement of an ejector rod to achieve the protection purpose. According to the method in the prior art, the end face of the end part of the electromagnetic coil is welded with the static contact piece, the welding area is relatively small, and the temperature rise of the welding part is high when the electromagnetic coil is used.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model aims to solve the technical problem that current solenoid leads to the problem that the temperature rise is high with static contact face of weld less relatively.

Realize the utility model discloses the technical scheme of purpose is:

a miniature circuit breaker comprises a shell, an arc extinguish chamber and an electromagnetic tripping device, wherein the arc extinguish chamber and the electromagnetic tripping device are arranged in the shell; the electromagnetic tripping device comprises a magnetic yoke, a coil framework, an electromagnetic coil, a movable iron core, a static iron core and a push rod, wherein the coil framework is fixed in the magnetic yoke, the electromagnetic coil is wound on the coil framework, one end of the electromagnetic coil is connected with a static contact piece, the other end of the electromagnetic coil is connected with a lug plate, the static iron core is fixed at one end, close to the movable contact, in the coil framework, the movable iron core is movably arranged at the other end in the coil framework, a spring is sleeved on the push rod to provide reset elasticity for the movable iron core and the push rod, the static iron core is hollow with a central through hole, the push rod is movably arranged in the static iron core, one end of the push rod is matched and connected with the movable iron core, an electric connecting piece is arranged at the root of the static contact piece, the cross section of the electromagnetic coil is rectangular, the electric connecting piece and the lug plate are both welded with the side face where the long side of the rectangle is located, and the welding area is larger than the cross section area of the electromagnetic coil, the root of the static contact is fixedly connected with the magnet yoke.

In the above technical solution, the magnetic yoke is a rectangular frame integrally formed.

In the technical scheme, an avoiding notch is arranged at the position, opposite to the ejector rod, of the magnetic yoke, the root of the static contact piece is provided with a lapping part attached to the magnetic yoke, a through hole is arranged at the position, opposite to the avoiding notch, of the lapping part, the outer end of the static iron core is provided with a riveting pipe part which extends outwards along the axial direction and penetrates through the avoiding notch and the through hole at the periphery of the central through hole, and the periphery of the outer end of the riveting pipe part is riveted on the lapping part.

In the above technical solution, a plurality of positioning bosses are formed around the yoke in the housing.

Among the above-mentioned technical scheme the casing shaping has a plurality ofly right the explosion chamber carries out the positioning groove and the location arch of location.

In the technical scheme, a supporting step is formed on one side, back to the moving contact, of the static contact piece on the inner wall of the shell, and the static contact piece is arranged on one side, facing the moving contact, of the static contact piece and corresponds to the supporting step.

The utility model discloses has positive effect: the utility model discloses an among the miniature circuit breaker, the electric connection piece reaches the lug all with the side welding at the long limit place of rectangle, and welding area is greater than solenoid's cross sectional area is through the electrically conductive area between increase solenoid and electric connection piece and the lug to reduce the temperature rise, further through with thereby the static contact root with thereby the yoke is fixed to be linked to each other and avoids the easy atress of static contact to warp and lead to the cracked problem of welding department, has better practicality.

Drawings

FIG. 1 is an internal structure diagram of a small and medium sized circuit breaker of the present invention;

fig. 2 is a structural diagram of the electromagnetic trip device of fig. 1;

fig. 3 is a cross-sectional view of the electromagnetic trip device shown in fig. 2;

fig. 4 is a structural diagram of the magnetic yoke of the present invention;

FIG. 5 is a structural diagram of the electromagnetic coil of the present invention;

fig. 6 is a structural diagram of the middle static contact of the present invention.

The reference symbols shown in the figures are: 1-a shell; 11-a positioning groove; 12-a positioning projection; 13-supporting a step; 2-an electromagnetic trip device; 21-a magnetic yoke; 211-avoiding the notch; 22-a coil former; 23-an electromagnetic coil; 24-a movable iron core; 25-a stationary core; 251-riveting a tube portion; 26-a top rod; 27-a spring; 3-static contact piece; 30-a stationary contact; 31-an electrical connection sheet; 32-a lap joint; 321-perforating; 4-a lug; 5-moving contact.

Detailed Description

The following description is made by combining the accompanying drawings of the specification to the concrete structure of the small and medium-sized circuit breaker of the utility model:

a miniature circuit breaker, as shown in fig. 1 to 6, comprises a housing 1, and an arc extinguishing chamber and an electromagnetic trip device 2 arranged in the housing 1; the electromagnetic tripping device 2 comprises a magnetic yoke 21, a coil framework 22, an electromagnetic coil 23, a movable iron core 24, a static iron core 25 and a push rod 26, wherein the coil framework 22 is fixed in the magnetic yoke 21, the electromagnetic coil 23 is wound on the coil framework 22, one end of the electromagnetic coil 23 is connected with a static contact piece 3, the other end of the electromagnetic coil is connected with a lug plate 4, the static iron core 25 is fixed at one end, close to the movable contact 5, in the coil framework 22, the movable iron core 24 is movably arranged at the other end in the coil framework 22, a spring 27 is sleeved on the push rod 26 to provide reset elasticity for the movable iron core 24 and the push rod 26, the static iron core 25 is hollow with a central through hole, the push rod 26 is movably arranged in the static iron core 25, one end of the push rod is matched and connected with the movable iron core 24, an electric connecting plate 31 is arranged at the root of the static contact piece 3, the section of the electromagnetic coil 23 is rectangular, the electric connecting plate 31 and the lug plate 4 are both welded with the side surface where the long side of the rectangle is located, the welding area is larger than the cross-sectional area of the electromagnetic coil 23, and the root of the static contact piece 3 is fixedly connected with the magnetic yoke 21. The utility model discloses an among the miniature circuit breaker, electric connection piece 31 reaches lug 4 all with the side welding at the long limit place of rectangle, and welding area is greater than solenoid 23's cross sectional area through increasing solenoid 23 and electric connection piece 31 and the conducting area between the lug 4 to reduce the temperature rise, further through with static contact 3 roots with thereby the fixed continuous problem that avoids static contact 3 to receive the force easily and warp and lead to the fracture of welding department of avoiding of yoke 21 has better practicality.

In this embodiment, the yoke 21 is formed in a rectangular frame shape by integral molding.

Furthermore, an avoiding notch 211 is arranged at a position on the magnetic yoke 21 opposite to the ejector rod 26, the root of the static contact piece 3 is provided with a lapping part 32 attached to the magnetic yoke 21, a through hole 321 is arranged at a position on the lapping part 32 opposite to the avoiding notch 211, the outer end of the static iron core 25 is provided with a riveting pipe part 251 which extends outwards along the axial direction and passes through the avoiding notch 211 and the through hole 321 at the periphery of the central through hole, and the periphery of the outer end of the riveting pipe part 251 is riveted on the lapping part 32, so that the static iron core 25, the magnetic yoke 21 and the static contact piece 3 are fixedly connected.

In this embodiment, a plurality of positioning bosses are formed around the magnetic yoke 21 in the housing 1, and the positioning bosses position the magnetic yoke 21 to position the electromagnetic trip device 2, thereby facilitating the installation and positioning of the electromagnetic trip device 2.

In this embodiment, the shaping has a plurality ofly right in casing 1 the explosion chamber carries out positioning groove 11 and the protruding 12 in location of fixing a position, through the convex part cooperation of positioning groove 11 with the explosion chamber side, through the slot part cooperation of protruding 12 in location with the explosion chamber side, realizes the location to the explosion chamber.

As a further improvement of this embodiment, a supporting step 13 is formed on one side of the static contact piece 3, which is opposite to the moving contact 5, on the inner wall of the housing 1, a static contact 30 is arranged on one side of the static contact piece 3, which faces the moving contact 5, and corresponds to the supporting step 13, and the supporting step 13 can laterally support the position of the static contact 30 on the static contact piece 3, so that the static contact piece 3 is prevented from being deformed due to frequent collision between the moving contact 5 and the static contact 30, and the service life of the housing is ensured.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. 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 such obvious changes and modifications which fall within the spirit of the invention are deemed to be covered by the present invention.

Claims

1. A small-sized circuit breaker comprises a shell (1), an arc extinguish chamber and an electromagnetic tripping device (2) which are arranged in the shell (1); the electromagnetic tripping device (2) comprises a magnetic yoke (21), a coil framework (22), an electromagnetic coil (23), a movable iron core (24), a static iron core (25), a push rod (26) and a spring (27), wherein the coil framework (22) is fixed in the magnetic yoke (21), the electromagnetic coil (23) is wound on the coil framework (22), one end of the electromagnetic coil (23) is connected with the static contact piece (3), the other end of the electromagnetic coil is connected with a lug plate (4), the static iron core (25) is fixed at one end, close to the movable contact (5), in the coil framework (22), the movable iron core (24) is movably arranged at the other end in the coil framework (22), the static iron core (25) is hollow with a central through hole, the push rod (26) is movably arranged in the static iron core (25), one end of the push rod is matched and connected with the movable iron core (24), the spring (27) is sleeved on the push rod (26) to provide reset elasticity for the movable iron core (24) and the push rod (26), the electromagnetic coil is characterized in that an electric connecting piece (31) is arranged at the root of the static contact piece (3), the cross section of the electromagnetic coil (23) is rectangular, the electric connecting piece (31) and the wiring piece (4) are welded with the side face where the long side of the rectangle is located, the welding area is larger than the cross section area of the electromagnetic coil (23), and the root of the static contact piece (3) is fixedly connected with the magnetic yoke (21).

2. The miniature circuit breaker according to claim 1, wherein said yoke (21) has an integrally formed rectangular frame shape.

3. The miniature circuit breaker according to claim 2, wherein an avoiding notch (211) is provided at a position of said yoke (21) opposite to said plunger (26), a root portion of said static contact piece (3) has a bridging portion (32) attached to said yoke (21), a through hole (321) is provided at a position of said bridging portion (32) opposite to said avoiding notch (211), a rivet tube portion (251) axially outwardly extending from an outer end of said static core (25) along a periphery of a central through hole and passing through said avoiding notch (211) and said through hole (321), and an outer end periphery of said rivet tube portion (251) is riveted to said bridging portion (32).

4. A miniature circuit breaker according to claim 3 wherein said housing (1) has a plurality of positioning bosses formed therein around said yoke (21).

5. The miniature circuit breaker according to claim 1, wherein a plurality of positioning grooves (11) and positioning protrusions (12) for positioning said arc extinguishing chamber are formed in said housing (1).

6. A miniature circuit breaker as claimed in claim 1, characterized in that said housing (1) is formed with a support step (13) on the inner wall thereof on the side of said static contact (3) facing away from said movable contact (5), said static contact (3) being provided with a static contact (30) on the side thereof facing said movable contact (5) at a position corresponding to said support step (13).