CN212230380U

CN212230380U - Circuit breaker with high-strength electrical contact

Info

Publication number: CN212230380U
Application number: CN202020773112.1U
Authority: CN
Inventors: 张国勇; 宋安超; 卫平春; 李富强
Original assignee: Anhui Huidian Technology Co ltd
Current assignee: Anhui Huidian Technology Co ltd
Priority date: 2020-05-12
Filing date: 2020-05-12
Publication date: 2020-12-25
Anticipated expiration: 2030-05-12

Abstract

The utility model discloses a circuit breaker with high strength electrical contact, including casing, static contact, movable contact subassembly and arc extinguishing subassembly, the movable contact subassembly includes the mount pad and fixes the moving contact on the mount pad, the moving contact includes contact portion and conductive part, the moving contact sets up to "7" font, the contact portion sets up the hook-like position at the moving contact front end, the hook-like position inboard of moving contact is provided with the moving contact silver point; the cross section of the static contact is trapezoidal, a static contact silver point is arranged on the inclined plane of one side of the static contact, and the static contact silver point is in contact with and conducted with a moving contact silver point; the moving contact assembly is connected with a tripping assembly, the tripping assembly drives the moving contact to be connected with or disconnected from the static contact, and the arc extinguishing assembly is driven by the tripping assembly to move and realize the isolation between the moving contact silver point and the static contact; the utility model discloses a circuit breaker, area of contact is big between moving contact and the static contact, and electrically conductive area is big, and the contact is reliable.

Description

Circuit breaker with high-strength electrical contact

Technical Field

The utility model belongs to the circuit breaker field, more specifically the circuit breaker with high strength electrical contact that says so relates to.

Background

The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition within a prescribed time. The circuit breaker comprises a fixed contact and a movable contact, and the circuit is switched on or off by utilizing the action of the movable contact and the fixed contact. With the development of electric power technology, the circuit breaker tends to be miniaturized more and more, so that the internal space of the circuit breaker is reduced, but the conduction area and the electric conduction capacity between a moving contact and a fixed contact cannot be reduced, so that new requirements are provided for the moving contact and the fixed contact of the circuit breaker.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a circuit breaker with high strength electrical contact, area of contact is big between moving contact and the static contact, and area of conduction is big, and the contact is reliable.

The utility model discloses technical scheme a circuit breaker with high strength electrical contact, including casing, static contact, movable contact subassembly and arc extinguishing subassembly, the movable contact subassembly includes the mount pad and fixes the moving contact on the mount pad, the moving contact includes contact portion and conductive part, the moving contact sets up to "7" font, the contact portion sets up the hook-like position at the moving contact front end, the hook-like position inboard of moving contact is provided with the moving contact silver point; the cross section of the static contact is trapezoidal, a static contact silver point is arranged on the inclined plane of one side of the static contact, and the static contact silver point is in contact with and conducted with a moving contact silver point;

the moving contact assembly is connected with a tripping assembly, the tripping assembly drives the moving contact to be connected with or disconnected from the static contact, and the arc extinguishing assembly is driven by the tripping assembly to move and realize the isolation between the moving contact silver point and the static contact.

Preferably, the moving contact comprises a plurality of contact blades, and the contact blades are connected in parallel and are all fixed on the mounting seat.

Preferably, the mounting seat is provided with a plurality of mounting grooves near the movable contact end, a gap is reserved between two adjacent mounting grooves, the mounting grooves are internally provided with conducting strips, and the contact blades are respectively fixed in the mounting grooves and are electrically connected with the conducting strips.

Preferably, the mounting seat is provided with an articulated shaft fixed with the shell far away from the moving contact end, the mounting seat is further provided with a connecting shaft, the connecting shaft is arranged between the articulated shaft and the moving contact, the tripping component is articulated with the connecting shaft, and the mounting seat and the moving contact are driven by the connecting shaft to rotate around the articulated shaft, so that the moving contact and the static contact are switched on or off.

Preferably, the tripping assembly comprises an action rod hinged with the connecting shaft, a wedge block facing the arc extinguishing assembly is arranged on the action rod, and the wedge block pushes the arc extinguishing assembly to move forwards along with the movement of the action rod so as to realize the isolation between the moving contact silver point and the static contact.

Preferably, the arc extinguishing assembly comprises a moving rod with a moving direction perpendicular to the moving rod direction, one end of the moving rod faces the moving rod, the other end of the moving rod faces the static contact position, and the moving rod is provided with an insulating sheet facing the static contact end.

Preferably, a return spring is arranged on the moving rod, and the other end of the return spring is fixed with the shell.

The utility model discloses technical scheme a circuit breaker with high strength electrical contact's beneficial effect is:

1. the design of the movable contact structure ensures that the contact surface between the movable contact structure and the fixed contact is larger, the contact is tighter, and the electric conduction is more reliable.

2. The movable contact is composed of a plurality of contact blades which are separated from each other and are arranged in parallel, so that the contact area of the movable contact and air is increased, the heat dissipation of the movable contact is facilitated, and the service life of the movable contact is prolonged.

3. The moving rod moves in the arc extinguishing assembly to realize electric arc isolation, the action space is small, the action stability is good, and the relay with small internal space is favorably suitable.

Drawings

Figure 1 is a schematic diagram of the circuit breaker with high-strength electrical contacts according to the technical scheme of the invention,

figure 2 is a schematic diagram of the circuit breaker with high-strength electrical contacts according to the technical solution of the present invention,

fig. 3 is the utility model discloses technical scheme a moving contact assembly sketch map of circuit breaker with high strength electrical contact.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

As shown in fig. 1, the utility model provides a circuit breaker with high strength electrical contact, including casing 1 (part is drawn), static contact 2, moving contact subassembly 4 and arc extinguishing subassembly 5 and dropout subassembly 3. The tripping component 3 drives the moving contact component 4 to contact or separate from the static contact 2, so that the circuit controlled by the circuit breaker is switched on and off. In fig. 1, a stationary contact 2 and a movable contact assembly 4 are in a conductive state. The moving contact component 4 is connected with the tripping component 3, and the tripping component 3 drives the moving contact 4 to be connected with or disconnected from the static contact 2. The arc extinguishing component 5 is driven by the tripping component 3 to move, and realizes the isolation between the moving contact silver point 413 and the static contact silver point 31, and cuts off the electric arc.

As shown in fig. 2, the movable contact assembly 4 includes a mounting seat 42 and a movable contact 41 fixed on the mounting seat 42. The movable contact 41 comprises a contact part 412 and a conductive part 411, the movable contact is arranged in a 7 shape, the contact part 412 is arranged at the hook-shaped position of the front end of the movable contact 41, and a movable contact silver point 413 is arranged on the inner side of the hook-shaped position of the movable contact 41. The cross section of the static contact 2 is trapezoidal, a static contact silver point 21 is arranged on the inclined plane of one side of the static contact 2, and the static contact silver point 21 is contacted and conducted with the moving contact silver point 413. In the technology, the structures of the static contact 2 and the moving contact 41 are designed, so that on one hand, the contact area between the static contact 2 and the moving contact 41 is increased. On the other hand, the arrangement of the inclined plane ensures that the contact between the static contact silver point 21 and the moving contact silver point 413 is more reliable, and the problem of local support contact can not occur.

As shown in fig. 2 and fig. 3, the movable contact 41 includes a plurality of contact blades 410, and the contact blades 410 are connected in parallel and fixed on the mounting seat 42. The mounting seat 42 is provided with a plurality of mounting grooves 421 near the end of the movable contact 41, and a gap is left between two adjacent mounting grooves 421. The mounting grooves 421 are provided with conductive plates 422, and the contact blades 410 are respectively fixed in the mounting grooves 421 and electrically connected with the conductive plates 422. The conductive sheet 422 is connected to an external wire to achieve circuit conduction. The contact blade 410 is fixed in the mounting groove 421 by a fastener such as a screw, and the conductive sheet 422 in the mounting groove 421 is tightly contacted and conducted. The conducting strips 422 in two adjacent mounting slots 421 are connected in series. The arrangement of the structure ensures that certain gaps are reserved between the contact blades 410, so that the contact area of the whole moving contact 41 and the air is increased, the heat dissipation capacity of the moving contact is improved, heat generated on the moving contact can be distributed timely, the over-high temperature inside the circuit breaker is avoided, and the service life and the safety performance of each component are reduced. And meanwhile, the service life of the moving contact is prolonged. The moving contact and the static contact in the technology are made of powder metallurgy materials consisting of silver-oxide spacers, and have the characteristics of good electric wear resistance, fusion welding resistance and stable contact resistance.

As shown in fig. 2 and 3, the mounting seat 42 is provided with a hinge shaft 423 fixed to the housing 1 at an end away from the movable contact 41. The mounting seat 42 is further provided with a connecting shaft 424, and the connecting shaft 424 is disposed between the hinge shaft 423 and the movable contact 41. The trip assembly 3 is hinged to the connecting shaft 424, and drives the mounting seat 42 and the moving contact 41 to rotate around the hinge shaft 423 through the connecting shaft 424, so that the moving contact 41 is connected with or disconnected from the static contact 2. The current in the circuit changes, so that the moving rod 31 in the trip assembly 3 moves under the action of different electromagnetic forces of a voltage transformer or a current transformer in the circuit, that is, the moving rod 31 moves to drive the mounting seat 42 and the movable contact 41 to rotate around the hinge shaft 423.

As shown in fig. 2, the trip assembly 3 includes an actuating rod 31 hinged to the connecting shaft 424, and a wedge 32 is disposed on the actuating rod 31 and faces the arc extinguishing assembly 5. The wedge 32 moves along with the movement of the action rod 31 to push the arc extinguishing component 5 to move forward, so that the movable contact silver point 413 is isolated from the fixed contact 2. An inclined plane facing the arc extinguishing component 5 is arranged on the wedge 32, the arc extinguishing component 5 is pushed by the inclined plane to realize the movement of the movable rod 51, and the movable rod 51 moves to the lower part of the movable contact silver point 413 to realize the arc isolation.

Referring to fig. 2, the arc extinguishing assembly 5 includes a moving rod 51 having a moving direction perpendicular to the direction of the moving rod 31, one end of the moving rod 51 faces the moving rod 31, the other end faces the position of the stationary contact 2, an insulating sheet 52 is disposed on the moving rod 51 facing the position of the stationary contact 2, and the insulating sheet 52 realizes arc isolation. The moving rod 51 is provided with a return spring 53, and the other end of the return spring 53 is fixed to the housing 1. When the static contact 2 is conducted with the moving contact 41, the return spring 53 is in a natural state, when the action rod 31 drives the wedge 32 to move, the wedge 32 pushes the moving rod 51 to move, the return spring 53 is stretched, when the wedge 32 is reset, the moving rod 51 is reset under the action of the return spring 53, so that the insulation sheet 52 is separated from the lower part of the moving contact silver point 413, and the moving contact silver point 413 is contacted with the static contact silver point 21 and conducted.

It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art and related fields without creative efforts shall fall within the protection scope of the present disclosure. The structures, devices, and methods of operation of the present invention, not specifically described and illustrated, are generally practiced by those of ordinary skill in the art without specific recitation or limitation.

Claims

1. A circuit breaker with high-strength electrical contacts comprises a shell, a fixed contact, a movable contact component and an arc extinguishing component, and is characterized in that the movable contact component comprises a mounting seat and a movable contact fixed on the mounting seat, the movable contact comprises a contact part and a conductive part, the movable contact is arranged in a 7 shape, the contact part is arranged at the hook-shaped position of the front end of the movable contact, and a movable contact silver point is arranged on the inner side of the hook-shaped position of the movable contact; the cross section of the static contact is trapezoidal, a static contact silver point is arranged on the inclined plane of one side of the static contact, and the static contact silver point is in contact with and conducted with a moving contact silver point;

2. The circuit breaker as claimed in claim 1, wherein the movable contact comprises a plurality of contact blades, and the contact blades are connected in parallel and fixed to the mounting base.

3. The circuit breaker of claim 2, wherein the mounting seat has a plurality of mounting slots near the movable contact end, a gap is left between two adjacent mounting slots, a conductive plate is disposed in the mounting slots, and the contact plates are respectively fixed in the mounting slots and electrically connected to the conductive plates.

4. The circuit breaker with high strength electrical contacts as claimed in claim 2, wherein the mounting base is provided with a hinge shaft fixed to the housing at a position away from the movable contact, the mounting base is further provided with a connecting shaft, the connecting shaft is disposed between the hinge shaft and the movable contact, the trip assembly is hinged to the connecting shaft, and the connecting shaft drives the mounting base and the movable contact to rotate around the hinge shaft, so as to connect or disconnect the movable contact and the fixed contact.

5. The circuit breaker of claim 4, wherein the trip assembly comprises a moving rod hinged to the connecting shaft, the moving rod is provided with a wedge block facing the arc extinguishing assembly, and the wedge block pushes the arc extinguishing assembly to move forward along with the movement of the moving rod to isolate the moving contact silver point from the stationary contact.

6. The circuit breaker of claim 5, wherein the arc extinguishing assembly comprises a moving rod having a moving direction perpendicular to the moving rod, one end of the moving rod faces the moving rod, the other end of the moving rod faces the static contact position, and the moving rod is provided with an insulating sheet facing the static contact end.

7. The circuit breaker with high strength electrical contacts as recited in claim 6, wherein the moving bar is provided with a return spring, and the other end of the return spring is fixed to the housing.