CN218677012U

CN218677012U - Moving contact and circuit breaker

Info

Publication number: CN218677012U
Application number: CN202223403905.2U
Authority: CN
Inventors: 赵方方; 韩畅; 宋志文; 吴建宾
Original assignee: Delixi Electric Co Ltd
Current assignee: Delixi Electric Co Ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-03-21
Anticipated expiration: 2032-12-19

Abstract

The utility model discloses a moving contact, including setting up in the silver point that moves of moving contact one side, on the first direction, the thickness of moving contact in moving silver point department is less than the thickness of moving contact in other positions departments to when passing through electric current and producing magnetic field in the moving contact, move the electric arc of silver point department and receive bigger magnetic field effort, the first direction is perpendicular to on the moving contact and moves the silver point and set up planar direction. The utility model discloses a moving contact, in the first direction, the position that sets up the silver point moves is the position that moving contact thickness is minimum, when the moving contact inserts the circuit and cut off and under the unchangeable condition of electric current size, owing to in the position of moving the silver point, the sectional area of moving contact is little, make the silver point of moving more be close to the central point of electric current and put, and then make the magnetic field that the electric current produced to the electric arc effort of moving the silver point position stronger, with the removal of moving the electric arc of silver point department with higher speed and with higher speed the arc extinguishing. The utility model also discloses a circuit breaker that contains above-mentioned moving contact.

Description

Moving contact and circuit breaker

Technical Field

The utility model relates to an electric arc extinguishing technical field, in particular to moving contact and circuit breaker.

Background

A circuit breaker is a device for switching on and off a current in a normal state and a current in a fault state to protect electrical equipment from damage, and plays an important role in the protection of the electrical equipment.

When the circuit breaker is switched on and off, a large number of electrons capable of being dissociated exist in a medium between the moving contact and the static contact, and the moving contact and the static contact of the circuit breaker can enable circuit current to reach minimum arcing current due to the existence of external voltage, so that the dissociated electrons form electric arcs to continuously conduct a circuit.

Therefore, it is an urgent technical problem to be solved by those skilled in the art how to accelerate the extinction of the arc between the contacts when the circuit breaker is opened to ensure the opening effect of the circuit breaker.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a moving contact to when the circuit breaker cut off, the extinguishing of electric arc between the contact is with higher speed, in order to guarantee the effect of cutting off of circuit breaker.

Another object of the present invention is to provide a circuit breaker including the above moving contact.

In order to achieve the above object, the utility model provides a following technical scheme:

a moving contact comprises a moving silver point arranged on one side of the moving contact, the thickness of the moving contact at the moving silver point is smaller than the thickness of the moving contact at other positions in a first direction, so that when current passes through the moving contact and a magnetic field is generated, an electric arc at the moving silver point is subjected to a larger magnetic field acting force, and the first direction is a direction perpendicular to a plane where the moving silver point is arranged on the moving contact.

Preferably, in the movable contact, the movable contact has a step-shaped configuration with at least two thicknesses in the first direction, and the movable silver point is disposed on a step-shaped layer with a relatively thin thickness on the movable contact.

Preferably, in the moving contact, a groove is formed in a side of the moving contact facing away from the moving silver point.

Preferably, in the moving contact, the groove penetrates through the moving contact in a second direction, and the second direction is a direction parallel to an axis of the moving contact rotating shaft.

Preferably, in the moving contact, one end of the groove, which is far away from the rotating shaft, is an arc contact, and the arc contact is made of metal silver or metal copper.

Preferably, in the movable contact, the groove has a step configuration.

Preferably, in the moving contact, the thickness of the moving contact at the moving silver point is 40% -50% of the thickness of the moving contact at other positions.

A circuit breaker comprises a moving contact and a fixed contact, wherein the moving contact is provided by any one of the embodiments, and a moving silver point of the moving contact is arranged towards the fixed contact.

The utility model provides a moving contact, including moving silver point, it sets up in one side of moving contact to move silver point, it opens and disconnected active end contact as the circuit, the one end that electric arc produced, in the first direction, the thickness of moving contact in moving silver point department is less than the thickness of moving contact in other positions, when passing through the electric current and producing magnetic field in the moving contact, move the electric arc of silver point department and receive bigger magnetic field effort, it is required to explain to be, first direction is perpendicular to the direction of moving silver point on the moving contact, the effect of above-mentioned structure lies in, move silver point because the branch divides to produce electric arc and make the circuit continuously switch on, and under the unchangeable condition of electric current size, the intensity in the magnetic field that the electric current produced does not change, this moment because it is thinner to move silver point department moving contact thickness, make the current density increase in the moving contact of moving silver point department, and then make the distance of moving silver point apart from the electric current central line closer, so that the effort that the magnetic field produced around moving silver point is bigger, magnetic field effort acts on the electric arc tip of moving silver point department, in order to elongate or drive electric arc, reach the effect of arc with higher speed. The utility model provides a moving contact moves the thickness dimension of silver point department moving contact through the change to when moving silver point and carrying out the electric current and cut off, keep under certain circumstances at the electric current size, move silver point and move the position of silver point one side electric current central line through reducing, and the reinforcing moves the effort that receives magnetic field around the silver point, and then realizes the purpose of electric arc drawing and removal with higher speed, in order to help extinguishing of electric arc between the contact, guarantee the effect of cutting off of circuit breaker.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a moving contact and a circuit breaker according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a movable contact and a circuit breaker according to another embodiment of the present invention;

wherein, 10 is a moving contact, 110 is a moving silver point, 120 is a groove, 130 is an arc contact, 140 is a rotating shaft, and 20 is a static contact.

Detailed Description

The utility model discloses a core lies in disclosing a moving contact to when the circuit breaker cut-off, the extinguishing of electric arc between the contact with higher speed, in order to guarantee the effect of cutting off of circuit breaker.

In order to make the technical field person understand the scheme of the present invention better, the embodiments of the present invention are explained below with reference to the attached drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.

As shown in fig. 1, a movable contact 10 provided in an embodiment of the present invention includes a movable silver point 110, the movable silver point 110 is disposed at one side of the movable contact 10, the movable silver point 110 is used as a contact point when a circuit is connected, and is a movable end contact for opening and breaking the circuit, when the circuit is cut off, one end of the broken arc is positioned at the movable silver point 110, and the structure of the embodiment of the utility model is specifically, in a first direction, the thickness of the movable contact 10 at the movable silver point 110 is smaller than the thickness of the movable contact 10 at other positions, that is, in the structure of the movable contact 10, the position of the movable silver point 110 is the position where the thickness of the movable contact 10 is the minimum, in order to generate a magnetic field by passing a current through the movable contact 10, the arc at the movable silver point 110 is subjected to a larger magnetic field acting force, and it should be noted that the first direction is a direction perpendicular to the plane where the movable silver point 110 is disposed on the movable contact 10, and in detail, the above-mentioned structure is provided for the purpose of, under the condition that the electricity utilization state and the medium around the contact are fixed in the same circuit, the energy of the electric arc generated between the contacts is fixed when the circuit is disconnected, under the condition that the current is kept unchanged, the magnetic field intensity generated by the circuit is also constant, and the thickness of the moving contact 10 at the moving silver point 110 is reduced, so that the current density of the moving contact 10 at the moving silver point 110 is increased, i.e., the current passing through the electrical contact at the movable silver point 110 will be constricted, causing the movable contact to be closer to the centerline of the current, and further, under the condition that the magnetic field intensity is kept unchanged, the periphery of the movable silver point 110 is subjected to stronger magnetic field acting force, the arc is rapidly elongated or driven by acting on the arc end part of the movable silver point 110, so that the purpose of accelerating the arc extinguishing is realized, the arc is prevented from ablating a contact for a long time, and the on-off effect of the circuit breaker is ensured.

The embodiment of the utility model provides a moving contact 10, for make the electric arc tip that moves silver point 110 department by quick stretching and drive, with moving contact 10 at the position thickness attenuate that moves silver point 110, so that when moving silver point 110 and carrying out the electric current and cut off, the position that the electric current moved silver point 110 on moving contact 10 is restrainted, and then make and move silver point 110 and be close to the position of electric current central line more, and then make and move silver point 110 and be closer to the central point in the magnetic field that the electric current produced and put, thereby under the unchangeable circumstances of magnetic field intensity, the reinforcing moves the effort that receives magnetic field around silver point 110, and then realize the purpose of drawing and removing with higher speed electric arc, in order to help extinguishing of electric arc between the contact, guarantee the effect of cutting off of circuit breaker.

Further, in an embodiment of the present invention, in order to realize the structure of the movable contact 10 at the movable silver point 110, the movable contact 10 has a step-like configuration with at least two thicknesses in the first direction, and the movable silver point 110 is disposed on the step-like layer with a thinner thickness on the movable contact 10, as shown in fig. 1, the movable contact 10 has a step-like configuration with two thicknesses in the first direction, and the movable silver point 110 is on the side with a thinner thickness on the movable contact 10, so that the movable silver point 110 is driven by a stronger magnetic field.

Further, in the utility model discloses in another embodiment, as shown in fig. 2, the moving contact 10 is uniform thickness, and the recess 120 is seted up in one side that moves silver point 110 dorsad to the moving contact 10, and the setting of recess 120 can reach only at the purpose of moving silver point 110 department attenuate moving contact 10 thickness, and then makes and move and receive stronger magnetic field drive power around silver point 110.

In order to further optimize the above technical solution, as shown in fig. 2, the groove 120 penetrates the movable contact 10 in the second direction, where the second direction is a direction parallel to the axis of the rotating shaft 140 of the movable contact 10, and the groove 120 penetrating the structure of the movable contact 10 is arranged, which not only can reduce the thickness of the movable contact 10 at the movable silver point 110 to the maximum extent, but also has the advantage that the arc contact 130 at one side of the groove 120 becomes a tilted state due to the existence of the penetrating groove 120, so that the arc at the movable silver point 110 can jump to the position of the arc contact 130 preferentially due to the arc striking function, so as to realize the initial elongation of the arc, and meanwhile, the arc end part burns at the arc contact 130, so as to protect the movable silver point 110 and avoid the arc from excessively ablating the movable silver point 110.

The material of the arcing contact 130 is preferably metallic silver or metallic copper.

Further, in addition to the above embodiments, the groove 120 may be an arcuate plateau or a step configuration, preferably a more easily machined step configuration.

Because the problem that moving contact 10 was punctured to the arc probably is produced to moving contact 10 thinness, consequently the embodiment of the utility model provides an in the moving contact 10, on the first direction, the thickness of moving contact 10 in movable silver point 110 department was 40% -50% of other position thickness of moving contact 10 to make moving contact 10 on the basis of guaranteeing current bearing strength, the thickness of the movable contact 10 of attenuate movable silver point 110 department as far as possible.

It should be noted that, in the above description of the thickness of the movable contact 10 at the movable silver point 110 and the thicknesses of other positions of the movable contact 10, the thickness specifically refers to the thickness of the movable contact 10 in the direction perpendicular to the plane where the movable silver point 110 is disposed, and the thicknesses of other arc action areas, except the movable silver point 110, on the movable contact 10 and the thicknesses of other arc action areas are equal to each other.

The embodiment of the utility model provides a still provides a circuit breaker, this circuit breaker contain moving contact 10 and static contact 20, and moving contact 10 is for the moving contact 10 that possesses the above-mentioned arbitrary embodiment technological effect, and moving contact 10 moves silver point 110 and sets up towards static contact 20 to carry out the intercommunication and the action of opening and shutting down of circuit.

The terms "first," "second," "left" and "right" and the like in the description and claims of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not set forth for a listed step or element but may include steps or elements not listed.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A moving contact is characterized by comprising a moving silver point (110) arranged on one side of the moving contact (10), wherein in a first direction, the thickness of the moving contact (10) at the moving silver point (110) is smaller than the thickness of the moving contact (10) at other positions, so that when current passes through the moving contact (10) and a magnetic field is generated, an electric arc at the moving silver point (110) is subjected to a larger magnetic field acting force, and the first direction is a direction perpendicular to a plane where the moving silver point (110) is arranged on the moving contact (10).

2. The movable contact of claim 1 wherein said movable contact (10) has a stepped configuration having at least two thicknesses in said first direction, said movable silver dot (110) being disposed on a step layer of said movable contact (10) having a relatively thin thickness.

3. A moving contact as claimed in claim 1, characterized in that the side of said moving contact (10) facing away from said moving silver point (110) is provided with a recess (120).

4. A movable contact according to claim 3, characterized in that said recess (120) extends through said movable contact (10) in a second direction, said second direction being a direction parallel to the axis of the rotation axis (140) of said movable contact (10).

5. A moving contact as claimed in claim 4, wherein an end of said recess (120) remote from said axis of rotation (140) is an arc contact (130), and said arc contact (130) is made of silver or copper.

6. A movable contact according to claim 3, wherein said recess (120) is of a step-like configuration.

7. A moving contact as claimed in claim 1, characterized in that said moving contact (10) has a thickness at said moving silver point (110) of between 40% and 50% of the thickness of said moving contact (10) at other positions.

8. A circuit breaker comprising a movable contact (10) and a stationary contact (20), wherein the movable contact (10) is the movable contact (10) according to any one of claims 1 to 7, and a movable silver point (110) of the movable contact (10) is disposed toward the stationary contact (20).