CN217521937U

CN217521937U - Circuit breaker

Info

Publication number: CN217521937U
Application number: CN202221549552.4U
Authority: CN
Inventors: 刘艳辉; 边玉兴; 赵智勇; 赵坤
Original assignee: Chusul Electric Co ltd
Current assignee: Chusul Electric Co ltd
Priority date: 2022-06-20
Filing date: 2022-06-20
Publication date: 2022-09-30
Anticipated expiration: 2032-06-20

Abstract

The utility model discloses a circuit breaker, including base, handle, operating device, pivot, moving contact, static contact, explosion chamber, its characterized in that: the handle sets up operating device is last, the operating device below is equipped with the pivot, the moving contact is connected with in the inside insertion of pivot, the pivot is fixed at the base middle part, static contact and explosion chamber are set up on the base, all be provided with the insulating chamber on the first locular wall of explosion chamber and the second locular wall, the inside permanent magnet that is provided with of insulating chamber, the permanent magnet is added to the explosion chamber in the circuit breaker, has improved arc extinguishing speed in the circuit breaker, be equipped with the first group of bars of one section horizontally and be the second group of bars of arc range around the permanent magnet between first locular wall and the second locular wall. Arc extinguishing voltage and arc extinguishing speed in the circuit breaker are improved to the setting of arc grid piece group, have increased the application range of explosion chamber.

Description

Circuit breaker

Technical Field

The utility model belongs to the technical field of electric power transmission and distribution equipment, specifically speaking relates to a circuit breaker.

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.

Arcing is a gas discharge phenomenon, and the presence of arcing prolongs the circuit path time and exacerbates the hazards of power system faults. Arcing is common during the opening of a circuit, and is particularly common in control circuit breakers.

In order to reduce the damage of electric arc to the power system, the circuit breaker often sets an arc extinguish chamber beside the moving contact and the static contact, so as to extinguish the electric arc as soon as possible. At present, an arc extinguish chamber arranged in the circuit breaker mostly pushes electric arcs to move towards the inside of the arc extinguish chamber by means of air blowing in the arc extinguish chamber and weak magnetic blowing brought by grid sheet magnetization of the arc extinguish chamber, and the electric arcs are not moved rapidly only by utilizing the air blowing and the internal weak magnetic blowing effect in the field of accurate circuit on-off control requirements. The inside arc extinguishing bars piece of present circuit breaker is straight shape or little slope arrangement mostly, under the prerequisite of certain circuit breaker high volume, bars piece quantity sets up limitedly, influences the maximum arc extinguishing voltage of explosion chamber, and then has just restricted the application range of circuit breaker, and traditional arc extinguishing bars piece sets up the arrangement mode and has only utilized the explosion chamber to cut apart the way that electric arc comes the arc extinguishing simultaneously, and the arc extinguishing means is single.

Disclosure of Invention

An object of the utility model is to provide a circuit breaker to it is relatively poor with the arc extinguishing effect to solve the arc extinguishing speed that current circuit breaker exists, and the problem that the circuit breaker range of application receives the interior grid piece restriction of arc extinguish chamber.

The utility model provides a circuit breaker, includes base, handle, operating device, pivot, moving contact, static contact, its characterized in that: the handle sets up operating device is last, operating device below is equipped with the pivot, the moving contact is connected with in the inside insertion of pivot, the pivot is fixed at the base middle part, the static contact is installed at the base both ends, still be equipped with the explosion chamber on the base, the inside permanent magnet that is provided with of explosion chamber.

Preferably, the circuit breaker still includes upper cover, well lid, bottom plate, the upper cover setting is covered in, and well lid passes through screw fixed connection on the base, the base bottom adopts screw fixed connection to have the bottom plate.

Preferably, the arc extinguish chamber comprises a first chamber wall, a second chamber wall, a first grid set and a second grid set, the first grid set is arranged above the second grid set, the first grid set and the second grid set are arranged between the first chamber wall and the second chamber wall, the inner sides of the first chamber wall and the second chamber wall are both provided with an insulating chamber, and the permanent magnet is arranged on the insulating chamber.

Preferably, the grid pieces of the first grid piece group are arranged horizontally, and the grid pieces of the second grid piece group are arranged in an arc shape around the permanent magnet.

Preferably, an iron grid is arranged at the top of the second grid sheet group, an arc striking angle is connected to the iron grid, and a convex contact is arranged on the grid sheet at the bottommost part of the first grid sheet group. The convex contact is connected with the static contact, and when the circuit breaker is in a disconnection state, the arc striking angle and the moving contact are in a nearly contact state.

Preferably, the base is also connected with a thermal element, and the thermal element is provided with a bimetal.

Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that: inside explosion chamber that is provided with of circuit breaker, be provided with magnetic blow reinforcing element in the explosion chamber, electric arc has been improved to the inside translation rate of explosion chamber, set up the inside partial grid piece of explosion chamber into the arc and arrange, can set up more arc extinguishing pieces under the unchangeable prerequisite of volume, let arc extinguishing upper limit voltage obtain improving, setting up of curved arc extinguishing grid piece group lets electric arc be elongated earlier when getting into the explosion chamber, later long electric arc is cut apart into short electric arc, last partial short electric arc is further elongated again, improve the inside arc extinguishing effect of circuit breaker.

Drawings

Fig. 1 is a schematic diagram of an explosion structure of the circuit breaker of the present invention;

fig. 2 is a schematic diagram of an internal structure of the circuit breaker according to the present invention;

fig. 3 is a schematic diagram of the internal structure of the circuit breaker according to the present invention;

fig. 4 is a schematic perspective view of the circuit breaker of the present invention;

fig. 5 is a schematic view of an explosion structure of the arc extinguish chamber in the present invention;

fig. 6 is a schematic diagram of the relationship between the arc extinguish chamber and the moving and static contacts when the circuit breaker is disconnected in the utility model;

fig. 7 is a schematic structural view of a thermal element according to the present invention.

The corresponding relationship between the reference numbers of the figures and the names of the components in the figures is as follows:

1. an upper cover; 2. a middle cover; 3. a base; 4. a base plate; 5. an operating mechanism; 6. a rotating shaft; 7. a thermal element; 8. an arc extinguishing chamber; 9. static contact; 10. a handle; 11. moving contact.

701. A bimetal; 801. a first chamber wall; 802. a second chamber wall; 803. a permanent magnet; 804. an insulating chamber; 805. a first group of grid plates; 806. a second group of grid plates; 807. an iron gate; 808. an arc striking angle; 809. and a male contact.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, which are part of the embodiments of the present invention, but not all of the embodiments. 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 this embodiment, the terms such as "up", "down", "left", "right", "front" and "back" are used for convenience to describe the present invention with reference to the drawings, and should not be construed as limiting the structure of the present invention.

As shown in fig. 1-7, a circuit breaker includes a base 3, a handle 10, an operating mechanism 5, a rotating shaft 6, a moving contact 11, and a static contact 9, where the handle 10 is installed on the operating mechanism 5, the rotating shaft 6 is installed below the operating mechanism 5, the rotating shaft 6 is fixed on a bracket in the middle of the base 3, the moving contact 11 is inserted into the rotating shaft 6, the static contact 9 is fixed on the base 3, an arc extinguish chamber 8 in contact with the static contact 9 is arranged above the static contact 9, and a permanent magnet 803 is arranged inside the arc extinguish chamber 8. In the closing process of the circuit breaker, the handle 10 is pulled, the handle 10 drives the operating mechanism 5 to operate and perform self-locking, meanwhile, the rotating shaft 6 below the operating mechanism 5 is driven to rotate, the rotating shaft 6 drives the moving contact 11 to move downwards, the moving contact 11 moves downwards to be contacted with the static contact 9, in the disconnecting process of the circuit breaker, the handle 10 is pulled again, the rotating shaft 6 drives the moving contact 11 to be separated from the static contact 9 under the driving of the operating mechanism 5, electric arcs can be generated between the moving contact 11 and the static contact 9, the electric arcs are influenced by the air blowing and magnetic blowing effects inside the circuit breaker and move towards the arc extinguish chamber 8, the arc extinguish chamber 8 is extinguished due to the addition of the permanent magnets 803, the magnetic field inside the circuit breaker is strengthened, the magnetic blowing effect is strengthened, and the electric arcs generated inside the circuit breaker can move into the arc extinguish chamber 8 more rapidly.

Specifically, the circuit breaker still includes upper cover 1, well lid 2, bottom plate 4, upper cover 1 sets up on 2 intermediate positions of well lid, and handle 10 wears out in the hole that sets up from upper cover 1, and well lid 2 is on base 3 through a plurality of screw fixed connection, there are a plurality of screw holes base 3 bottom for each partial subassembly of fixed inside, bottom plate 4 is through both ends screw fixation in base 3 bottom, avoids base 3 screw and outside to contact.

Further, the arc extinguish chamber 8 further includes a first chamber wall 801, a second chamber wall 802, a first grid set 805, and a second grid set 806, the first grid set 805 is disposed above the second grid set 806, the first chamber wall 801 and the second chamber wall 802 have a plurality of grid holes, the first grid set 805 and the second grid set 806 are inserted into the grid holes to be fixed between the first chamber wall 801 and the second chamber wall 802, an insulating chamber 804 is disposed inside the first chamber wall 801, the insulating chamber 804 is connected to the first chamber wall 801 in a snap-fit manner, the insulating chamber 804 and the first chamber wall 801 form a closed structure, and the permanent magnet 803 is fixedly disposed therein. The second chamber wall 802 is similarly provided with an insulating chamber 804, and a permanent magnet 803 is fixed in the insulating chamber 804. Inside electric arc got into explosion chamber 8, can be cut apart into a plurality of short electric arcs by the arc extinguishing bars piece, short electric arc is difficult to maintain self-stabilization, and final electric arc is extinguished, all has on the left and right sides locular wall of explosion chamber 8 in this embodiment to set up insulating chamber 804, and the inside permanent magnet 803 that sets up of insulating chamber 804 can create the magnetic field, strengthens the magnetic blow-out effect to electric arc, lets electric arc move inside the arc extinguishing bars piece more rapidly, and then has improved the speed that the circuit breaker extinguished electric arc.

Further, first grid set 805 is disposed below second grid set 806, and the grids in first grid set 805 are arranged horizontally; the grid plates in the second grid plate group 806 are arranged in an arc shape, the grid plates adjacent to the top of the first grid plate group 805 are arranged in a fine angle mode around the permanent magnet 803, finally, arc extinguishing grid plates at the top and arc extinguishing grid plates at the bottom are in a state of nearly 90 degrees, the arc arrangement of the second grid plate group 806 can be realized by arranging more arc extinguishing grid plates under the condition that the volume height of the circuit breaker is unchanged, the upper limit of arc extinguishing voltage of the arc extinguishing chamber 8 is improved, an electric arc is elongated by the arc second grid plate group 806 in the process of entering the arc extinguishing chamber 8 and then enters the arc extinguishing grid plate group and is divided, the small angle design between the adjacent grid plates of the second arc extinguishing grid plate group enables a short arc entering the second grid plate group 806 to be elongated again, and the two arc extinguishing modes are combined, so that the arc extinguishing speed of the arc extinguishing chamber 8 in the circuit breaker is improved.

Further, an iron grid 807 is arranged at the top of the second arc extinguishing grid group, a convex arc striking angle 808 is arranged on the iron grid 807, and the arc striking angle 808 and the moving contact 11 in the disconnecting state of the circuit breaker are in an almost contact state; the bottom grid sheet of the first grid sheet group 805 is provided with a convex contact 809, the convex contact 809 is in contact with a static contact 9 at the bottom of the arc extinguish chamber 8, and the convex contact 809 and the arc striking angle 808 enable generated electric arcs to be rapidly transferred from the position between the movable contact 11 and the static contact 9 into the arc extinguish chamber 8, so that the arc extinguish speed of the arc extinguish chamber 8 in the circuit breaker is further improved.

Furthermore, the base 3 is also connected with a thermal element 7, the right end of the thermal element 7 is fixedly connected with an elongated bimetal 701, and when the circuit breaker is closed, the operating mechanism 5 contacts the bimetal 701 to conduct the current conducted on the thermal element 7 to the movable contact 11, so as to realize the conduction of the circuit.

Claims

1. A circuit breaker, characterized by: including base (3), handle (10), operating device (5), pivot (6), moving contact (11), static contact (9), handle (10) set up operating device (5) are last, operating device (5) below is equipped with pivot (6), pivot (6) inside plug-in connection has moving contact (11), pivot (6) are fixed on base (3), still be fixed with static contact (9) and explosion chamber (8) on base (3), explosion chamber (8) inside is provided with permanent magnet (803).

2. The circuit breaker of claim 1, wherein: the circuit breaker further comprises an upper cover (1), a middle cover (2) and a bottom plate (4), wherein the upper cover (1) is arranged on the middle cover (2), the middle cover (2) is fixedly connected onto the base (3), and the bottom plate (4) is arranged at the bottom of the base (3).

3. The circuit breaker of claim 1, wherein: the arc extinguish chamber (8) further comprises a first chamber wall (801), a second chamber wall (802), a first grid set (805) and a second grid set (806), the first grid set (805) is arranged above the second grid set (806), the first grid set (805) and the second grid set (806) are arranged between the first chamber wall (801) and the second chamber wall (802), insulating chambers (804) are arranged on the inner sides of the first chamber wall (801) and the second chamber wall (802), and the permanent magnets (803) are arranged on the insulating chambers (804).

4. The circuit breaker of claim 3, wherein: the grid plates of the first grid plate group (805) are arranged horizontally, and the grid plates of the second grid plate group (806) are arranged in an arc shape around the permanent magnet (803).

5. The circuit breaker of claim 4, wherein: an iron grid (807) is arranged at the top of the second grid group (806), an arc striking angle (808) is connected to the iron grid (807), a convex contact (809) is arranged on the grid at the bottommost part of the first grid group (805), the convex contact (809) is connected with the static contact (9), and when the circuit breaker is in a disconnected state, the arc striking angle (808) and the movable contact (11) are almost in contact.

6. The circuit breaker of claim 1, wherein: the base (3) is also connected with a thermal element (7), and the thermal element (7) is provided with a bimetal (701).