CN221176129U - Contact mechanism and circuit breaker - Google Patents

Abstract

The application provides a contact mechanism and a circuit breaker, and belongs to the technical field of electrical equipment. The circuit breaker includes explosion chamber, and this contact mechanism includes stationary contact and striking spare. The static contact comprises a connecting section, a static contact is arranged on the connecting section, and the static contact faces the arc inlet side of the arc extinguishing chamber. The arc striking piece comprises a body section and an extension section which are connected with each other, the extension section bends towards the connection section relative to the body section, and one end of the extension section, which is far away from the body section, is connected with the connection section. The extension section is located into the arc side, and the body section extends to the explosion chamber from advancing the arc side. The static contact is made of non-magnetic materials, and the arc striking piece is made of magnetic materials. The application can improve the transfer efficiency of the electric arc to the arc extinguishing chamber, improve the extinguishing speed of the electric arc and reduce the possibility of damaging the movable contact and the static contact by the electric arc.

Description

Contact mechanism and circuit breaker

Technical Field

The application relates to the technical field of electrical equipment, in particular to a contact mechanism and a circuit breaker.

Background

Circuit breakers are important switching devices in electrical power facilities that are capable of closing, carrying and opening the current in a circuit. When faults such as electric leakage, overload, short circuit and the like occur in a circuit accessed by the circuit breaker, the circuit breaker can cut off the circuit through opening the gate so as to prevent the faults from expanding.

However, when the circuit breaker is opened, an arc is generated between the movable contact and the stationary contact. If these arcs are not transferred and extinguished in time, damage will be caused to the moving contact and the stationary contact, thereby affecting the normal use of the circuit breaker.

Disclosure of utility model

In view of the above problems, the embodiment of the application provides a contact mechanism and a circuit breaker, which can improve the transfer efficiency of an arc to an arc extinguishing chamber, improve the extinguishing speed of the arc and reduce the possibility of damage of a movable contact and a stationary contact by the arc.

In a first aspect of an embodiment of the present application, a contact mechanism is provided, for use in a circuit breaker, the circuit breaker including an arc chute, the contact mechanism including a stationary contact and an arcing member. The static contact comprises a connecting section, a static contact is arranged on the connecting section, and the static contact faces the arc inlet side of the arc extinguishing chamber. The arc striking piece comprises a body section and an extension section which are connected with each other, the extension section bends towards the connection section relative to the body section, and one end of the extension section, which is far away from the body section, is connected with the connection section. The extension section is located into the arc side, and the body section extends to the explosion chamber from advancing the arc side. The static contact is made of non-magnetic conductive material, and the arc striking piece is made of magnetic conductive material.

The extension section is connected to one end of the body section and connected with the connecting section, so that the size of a part of the arc striking piece opposite to the arc inlet side position can be prolonged, and the size of the connecting section of the static contact is shortened. Therefore, on one hand, the arc striking piece is made of the magnetic conductive material, and when the arc passes through the magnetic arc striking piece, a magnetic field can be generated, and under the condition that the magnetic field can generate attractive force to the arc, the arc can be conveniently and rapidly led into the arc extinguishing chamber to be extinguished under the action of the magnetic field. On the other hand, the time that the arc generated when the movable contact is separated from the stationary contact stays on the connecting section is shorter, the arc can instantaneously flow through the shorter connecting section and be transferred from the connecting section to the extension section of the longer striking piece, and therefore, the damage of the arc to the stationary contact on the connecting section can be reduced.

In some embodiments, the material of the arc initiation member comprises at least one of iron, nickel, and cobalt.

Iron, nickel, cobalt and the like are all conductive magnetic materials, and have good conductive performance and magnetic performance. The arc striking piece is made of the materials, so that the arc striking piece can not only absorb and disperse arc energy, but also guide the arc to the arc extinguishing chamber, so that the arc generated when the movable contact and the fixed contact are separated can be quickly and timely transferred to the arc extinguishing chamber to be extinguished, the extinguishing efficiency of the arc can be improved, and the possibility of burning the fixed contact by the arc is reduced.

In some embodiments, the surface of the striking member is coated with a copper layer.

The copper material has good electric conductivity and heat conductivity, so that the arc striking piece has magnetism and electric conductivity, so that the temperature rise of the arc striking piece in the current conducting process can be reduced on the basis of improving the arc extinguishing efficiency, and the service performance of the circuit breaker is improved. In addition, the surface of the arc striking piece is covered with a copper layer, so that rust prevention can be realized.

In some embodiments, the projection of the connecting section is smaller than the projection of the extension section in the arrangement direction of the stationary contact and the arc extinguishing chamber.

By the above scheme, the connecting section is as short as possible, and the extending section is as long as possible. Therefore, the temperature rise near the static contact is ensured to be smaller through the shorter connecting section, the damage to the static contact is reduced, and the generation of a sufficient magnetic field can be ensured through the longer extending section, so that the electric arc is promoted to be transferred into the arc extinguishing chamber.

In some embodiments, the connecting section is substantially parallel to the extension section.

Through the scheme, when the extension section and the connecting section are welded, a larger contact area can be formed between the extension section and the connecting section, so that the welding difficulty can be reduced, and the welding firmness between the extension section and the connecting section can be improved.

In some embodiments, a welding bump is arranged on one side of the extension section facing the connection section, and the welding bump is welded with the connection section.

Through the scheme, the welding convex points can be used as positioning points of welding positions, so that the extending sections can keep correct relative positions with the connecting sections, and the welding accuracy and precision are guaranteed conveniently. In addition, the welding convex points are beneficial to heat conduction and dispersion in the welding process, and thermal stress and deformation at the welding seam can be reduced. And the welding salient points can increase the area of the welding seam, so that the stability and strength of the welding seam are improved, the quality of the welding seam can be improved, and the firmness of the welding relation between the connecting section and the extending section is improved.

In some embodiments, the extension Duan Weiping is plate-like or concave.

Through above-mentioned scheme, when guaranteeing that the extension is convenient for lead the arc that produces when separating movable contact with the stationary contact to the explosion chamber, can also set up the structural style of extension in a flexible way.

In some embodiments, the extension segment is integrally formed with the body segment.

Through the scheme, the connecting procedure of the body section and the extension section can be saved, so that the assembly efficiency of the contact mechanism is improved conveniently.

In some embodiments, the arc striking member further comprises first and second opposing side plates connected to the body section proximate the extension section. The contact mechanism further comprises a first arc isolation piece and a second arc isolation piece, wherein the first arc isolation piece is arranged on the first side plate, and the second arc isolation piece is arranged on the second side plate.

Through above-mentioned scheme, can form the horizontal magnetic field that blows between first arc separation spare and second arc separation spare, this horizontal magnetic field that blows can apply effort to the electric arc for the electric arc can remove to the explosion chamber more easily, thereby is convenient for improve the extinction speed of electric arc.

In a second aspect of the embodiments of the present application, there is provided a circuit breaker comprising a housing, an arc chute and the contact mechanism of the first aspect, the arc chute and the contact mechanism being mounted within the housing.

The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and may be implemented according to the content of the specification, so that the technical means of the embodiments of the present application can be more clearly understood, and the following specific embodiments of the present application are given for clarity and understanding.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a part of a circuit breaker according to an embodiment of the present application under a first view angle.

Fig. 2 is a schematic view of a part of a circuit breaker according to an embodiment of the present application under a second view angle.

Fig. 3 is a schematic diagram of a combined structure of a contact mechanism according to an embodiment of the present application.

Fig. 4 is an exploded view of a contact mechanism according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of an arc striking member according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a first arc isolation member according to an embodiment of the present application.

Reference numerals illustrate:

100. an arc extinguishing chamber; 110. an arc inlet side;

200. a contact mechanism; 210. a moving contact; 220. a stationary contact; 221. a connection section; 2211. a stationary contact; 222. a wire connecting section; 230. an arc striking piece; 231. a body section; 232. an extension section; 2321. welding the convex points; 233. a first side plate; 234. a second side plate;

300. A first arc-separating member; 310. a first mounting groove;

400. a second arc-separating member; OX, the arrangement direction of the stationary contact and the arc extinguishing chamber.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the applications herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the application and in the description of the drawings are intended to cover a non-exclusive inclusion.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

The directional terms appearing in the following description are all directions shown in the drawings and do not limit the specific structure of the contact mechanism and the circuit breaker of the present application. For example, in the description of the present application, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate an azimuth or a positional relationship based on that shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application.

Furthermore, expressions such as OX direction indicating directions for explaining the operations and configurations of the respective members of the contact mechanism and the circuit breaker of the present embodiment are not absolute but relative, and although these indications are appropriate when the respective members of the contact mechanism and the circuit breaker are in the positions shown in the drawings, these directions should be interpreted differently when these positions are changed to correspond to the changes.

Furthermore, the terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order, and may be used to improve one or more of these features either explicitly or implicitly.

In the description of the present application, unless otherwise indicated, the meaning of "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two).

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, e.g., as a "connected" or "coupled" of a mechanical structure may refer to a physical connection, e.g., as a fixed connection, e.g., via a fastener, such as a screw, bolt, or other fastener; the physical connection may also be a detachable connection, such as a snap-fit or snap-fit connection; the physical connection may also be an integral connection, such as a welded, glued or integrally formed connection. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

In order to enable those skilled in the art to better understand the scheme of the present application, the structure of the circuit breaker provided by the embodiment of the present application is described below.

Fig. 1 is a schematic view of a part of a circuit breaker according to an embodiment of the present application under a first view, and fig. 2 is a schematic view of a part of a circuit breaker according to an embodiment of the present application under a second view, as shown in fig. 1 and fig. 2, the circuit breaker includes a housing (not shown in the drawings), an arc extinguishing chamber 100 and a contact mechanism 200, and both the arc extinguishing chamber 100 and the contact mechanism 200 are installed in the housing.

The housing has a receiving cavity in which the arc chute 100 and the contact mechanism 200 are located, and the arc chute 100 and the contact mechanism 200 are fixedly connected with the housing to enable the installation of the arc chute 100 and the contact mechanism 200 in the housing.

The arc chute 100 has an arc entrance side 110, the arc entrance side 110 being the side of the arc chute 100 through which an arc passes when entering the arc chute 100 from outside the arc chute 100. The contact mechanism 200 comprises a moving contact 210, a fixed contact 220 and an arc striking piece 230, wherein the moving contact 210 is provided with a moving contact, the fixed contact 220 is provided with a fixed contact 2211, the moving contact and the fixed contact 2211 are mutually matched, and the moving contact and the fixed contact 2211 are positioned on the arc entering side 110 of the arc extinguishing chamber 100. The specific structure of the contact mechanism 200 will be described in detail in the following embodiments, which will not be described herein.

The movable contact and the stationary contact 2211 can be separated to protect the circuit when the circuit connected with the circuit breaker is overloaded or short-circuited and other faults are caused no matter the circuit breaker is normally opened. The arc generated when the movable contact is separated from the stationary contact 2211 is guided by the striking member 230, and can be rapidly entered into the arc extinguishing chamber 100 to be extinguished.

According to the circuit breaker provided by the application, the arc striking piece 230 in the contact mechanism 200 can improve the transfer efficiency of an arc to the arc extinguishing chamber 100, improve the extinguishing speed of the arc and reduce the possibility that the movable contact and the stationary contact 2211 are damaged by the arc.

The contact mechanism 200 in the embodiments of the present application will be described more fully and clearly below with reference to the accompanying drawings.

Fig. 3 is a schematic diagram of a combined structure of a contact mechanism according to an embodiment of the present application, fig. 4 is an exploded view of a contact mechanism according to an embodiment of the present application, fig. 5 is a schematic diagram of an arc striking member according to an embodiment of the present application, and as shown in fig. 1 to 5, the contact mechanism 200 includes a fixed contact 220 and an arc striking member 230.

The stationary contact 220 includes a connection section 221, and a stationary contact 2211 is disposed on the connection section 221, where the stationary contact 2211 faces the arc inlet side 110 of the arc extinguishing chamber 100. The striking member 230 includes a body section 231 and an extension section 232 connected to each other, the extension section 232 is bent toward the connection section 221 with respect to the body section 231, and an end of the extension section 232 remote from the body section 231 is connected to the connection section 221. The extension section 232 is located at the arc entrance side 110, and the body section 231 extends from the arc entrance side 110 to the arc extinguishing chamber 100. The fixed contact 220 is made of a non-magnetic conductive material, and the arc striking member 230 is made of a magnetic conductive material.

The stationary contact 220 may further include a wire segment 222, and the wire segment 222 is integrally formed with the connection segment 221. The connection segment 222 is electrically connected with the wire inlet end of the circuit breaker, the stationary contact 2211 is welded on the connection segment 221, and the stationary contact 2211 is opposite to the arc inlet side 110, so that when the movable contact and the stationary contact 2211 are separated to generate an arc, the arc can smoothly enter the arc extinguishing chamber 100.

The fixed contact 220 may be made of a non-magnetic conductive material such as copper. For example, the fixed contact 220 is made of copper material, and the copper material has higher heat conductivity and can conduct heat faster, so that heat is not easy to gather on the fixed contact 220, and the temperature rise is smaller. In addition, the copper material has good conductivity, so that current can be effectively conducted, heat generated by the resistor is reduced, heat is not easy to gather on the fixed contact 220, and the possibility of temperature rise is further reduced.

The body section 231 and the extension section 232 of the striking member 230 may be integrally formed to save the connecting process of the body section 231 and the extension section 232. In practice, the body section 231 and the extension section 232 may be formed separately and then connected by welding or the like, and the forming manner of the body section 231 and the extension section 232 is not limited in the embodiment of the present application.

In the case where the body section 231 and the extension section 232 are integrally formed, the arc striking member 230 may be formed using a stamping process. After one-time stamping, the body segment 231 is bent relative to the extension segment 232, or the extension segment 232 is bent relative to the body segment 231, so as to form the arc striking member 230.

The arc striking member 230 and the fixed contact 220 are mutually close, and one end of the extension section 232, which is far away from the body section 231, is welded with the connection section 221, so that the connection between the arc striking member 230 and the fixed contact 220 can be realized. The extension section 232 and the connection section 221 may have smaller overlapping sections, so long as the overlapping sections of the extension section 232 and the connection section 221 meet the welding size requirement, so that materials of the extension section 232 and the connection section 221 are saved.

The arc striking member 230 may be made of a magnetic conductive material such as iron. Because the magnetic conductive material has good magnetism, under the action of the arc, the magnetic striking member 230 can generate a magnetic field, and the magnetic field can generate attractive force to the arc, so that the arc can be quickly and timely led into the arc extinguishing chamber 100 to be extinguished.

The body section 231 may be generally planar. The extension 232 may have a flat plate shape or a concave shape so long as it is convenient to guide an arc generated when the movable contact is separated from the stationary contact 2211 to the arc extinguishing chamber 100, which is not limited by the embodiment of the present application.

In the embodiment of the present application, the extension section 232 is connected to one end of the body section 231, and the extension section 232 is connected to the connection section 221, so that the size of the portion of the striking member 230 opposite to the position of the arc inlet side 110 can be prolonged, and the size of the connection section 221 of the stationary contact 220 can be shortened. In this way, on the one hand, when the arc striking member 230 is made of the magnetic conductive material, and the arc can generate a magnetic field when passing through the magnetic arc striking member 230, the magnetic field can generate attractive force to the arc, so that the arc can be conveniently and rapidly led into the arc extinguishing chamber 100 to be extinguished under the action of the magnetic field. On the other hand, the time that the arc generated when the movable contact is separated from the stationary contact 2211 stays on the connection section 221 is short, and the arc can instantaneously flow through the short connection section 221, and be transferred from the connection section 221 to the extension section 232 of the long striking member 230, so that damage of the arc to the stationary contact 2211 on the connection section 221 can be reduced.

In addition, in the case that the fixed contact 220 is made of a non-magnetic conductive material and the size of the connection section 221 of the fixed contact 220 is relatively shortened, the amount of material used for the fixed contact 220 can be saved. In the case where the fixed contact 220 is made of a copper material and the arc striking member 230 is made of an iron material, saving the amount of material used for the fixed contact 220 means saving cost.

In some embodiments, the material of the arc initiation member 230 may include at least one of iron, nickel, and cobalt.

Illustratively, the arc striking member 230 may be made of only iron material, only nickel material, cobalt material, or an alloy material composed of a plurality of materials among the magnetic conductive materials such as iron, nickel, cobalt, etc., which is not limited in the embodiment of the present application.

Iron, nickel, cobalt and the like are all conductive magnetic materials, and have good conductive performance and magnetic performance. The arc striking member 230 is made of these materials, so that the arc striking member 230 not only can absorb and disperse arc energy, but also can guide the arc to the arc extinguishing chamber 100, so that the arc generated when the movable contact is separated from the stationary contact 2211 can be quickly and timely transferred to the arc extinguishing chamber 100 for extinguishing, the extinguishing efficiency of the arc can be improved, and the possibility of burning the stationary contact 220 by the arc can be reduced.

Further, in some embodiments, the surface of the arc initiation member 230 may be coated with a copper layer.

That is, the arc striking member 230 may be formed by plating a copper material on the surface of the magnetic conductive material. The arc striking member 230 may be made of a copper-clad steel material, which may be obtained by plating a thin copper layer on a steel plate, for example.

Because the copper material has good electrical conductivity and thermal conductivity, not only can conduct current, but also the temperature rise is smaller under the action of an electric arc, so that a copper layer is coated on the surface of the striking member 230, particularly on the surface of the extension section 232 in the striking member 230, the striking member 230 has magnetism and electrical conductivity, and the arc extinguishing efficiency is convenient to improve, and the temperature rise of the striking member 230 in the current conducting process can be reduced, so that the usability of the circuit breaker is improved. In addition, the surface of the striking part 230 is covered with a copper layer to prevent rust, so that the service life of the striking part 230 is prolonged.

In some embodiments, the projection of the connection section 221 may be smaller than the projection of the extension section 232 in the arrangement direction OX of the stationary contact and the arc extinguishing chamber.

The connecting section 221 is used for providing a stationary contact 2211, and the extending section 232 is used for guiding the arc to move into the arc extinguishing chamber 100.

The projection of the connecting section 221 is set smaller than the projection of the extending section 232 so that the connecting section 221 is as short as possible and the extending section 232 is as long as possible. In this way, not only can the shorter connecting section 221 ensure that the temperature rise near the stationary contact 2211 is smaller, and the damage to the stationary contact 2211 is reduced, but also the longer extending section 232 ensures that a sufficient magnetic field is generated, so as to promote the transfer of the arc into the arc extinguishing chamber 100.

In some embodiments, the connecting segment 221 and the extending segment 232 may be substantially parallel.

The substantially parallel direction herein means that the angle between the connection section 221 and the extension section 232 is approximately equal to 0 degrees, for example, the angle between the connection section 221 and the extension section 232 may be 2 degrees or 4 degrees, etc., which is not limited by the embodiment of the present application.

Through the above scheme, when the extension section 232 and the connecting section 221 are welded, a larger contact area can be formed between the extension section 232 and the connecting section 221, so that the welding difficulty can be reduced, and the welding firmness between the extension section and the connecting section can be improved.

With continued reference to fig. 4 and 5, in some embodiments, as shown in fig. 4 and 5, a side of the extension section 232 facing the connection section 221 may be provided with a solder bump 2321, and the solder bump 2321 is soldered to the connection section 221.

There is a certain overlap between the extension 232 and the connection 221 so that the extension 232 and the connection 221 are welded in the area of the overlap.

A solder bump 2321 may be provided at a location of the extension 232 for overlapping with the connection section 221. The number of the solder bumps 2321 may be one or a plurality, and the plurality of solder bumps 2321 may be distributed at intervals at a portion of the extension section 232 for overlapping with the connection section 221. The solder bump 2321 may be a bump provided at the portion, and the shape of the solder bump 2321 may be any shape such as a circle, a square, or the like.

The welding convex points 2321 are arranged on the extension sections 232, and the welding convex points 2321 can be used as positioning points of welding positions, so that the extension sections 232 and the connecting sections 221 can keep correct relative positions, and welding accuracy and precision are guaranteed conveniently.

By welding the solder bump 2321 to the connection section 221, on the one hand, the solder bump 2321 facilitates heat conduction and dispersion during the welding process, and thermal stress and deformation at the weld can be reduced. On the other hand, the welding bump 2321 may increase the area of the welding seam, so as to facilitate improving the stability and strength of the welding seam, improve the quality of the welding seam, and improve the reliability of the welding relationship between the connection section 221 and the extension section 232.

Fig. 6 is a schematic structural diagram of a first arc-isolating member according to an embodiment of the present application, and in some embodiments, as shown in fig. 1, 2, 5 and 6, the arc-striking member 230 may further include a first side plate 233 and a second side plate 234 opposite to each other, where the first side plate 233 and the second side plate 234 are connected to the body section 231 near the extension section 232. The contact mechanism 200 further includes a first arc-isolating member 300 and a second arc-isolating member 400, the first arc-isolating member 300 being mounted to the first side plate 233 and the second arc-isolating member 400 being mounted to the second side plate 234.

The first side plate 233 and the second side plate 234 may have the same structure. The first side plate 233 and the second side plate 234 may be integrally formed with the body section 231, so as to save the connecting process of the first side plate 233 and the second side plate 234 with the body section 231. After the arc striking member 230 is press-formed, the arc striking member 230 is bent, and the first side plate 233 and the second side plate 234 may be formed.

The first arc separating member 300 and the second arc separating member 400 are symmetrical in structure. The first arc isolating member 300 may be provided with a first mounting groove 310, and the first mounting groove 310 is inserted into the first side plate 233, so that the first arc isolating member 300 can be mounted on the first side plate 233. Similarly, the second arc isolation member 400 may be provided with a second mounting groove, and the second mounting groove is inserted into the second side plate 234, so that the second arc isolation member 400 can be mounted on the second side plate 234.

The first arc separating member 300 and the second arc separating member 400 may comprise a gas generating material such as nylon, or may comprise a magnetic material such as iron. In the case that the first arc-isolating member 300 and the second arc-isolating member 400 include a gas generating material, the first arc-isolating member 300 and the second arc-isolating member 400 may release a gas such as hydrogen to generate a gas flow field under the high temperature of the arc, and may cool the arc to accelerate the arc to extinguish.

The first side plate 233 is positioned opposite to the second side plate 234, the first arc insulator 300 is mounted on the first side plate 233, and after the second arc insulator 400 is mounted on the second side plate 234, the first arc insulator 300 is also positioned opposite to the second arc insulator 400. In this way, a cross-blowing magnetic field may be formed between the first arc barrier 300 and the second arc barrier 400, which may apply a force to the arc, so that the arc may more easily move toward the arc extinguishing chamber 100, thereby facilitating an improvement in the extinguishing speed of the arc.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A contact mechanism for use in a circuit breaker, the circuit breaker including an arc chute, the contact mechanism comprising:

the fixed contact comprises a connecting section, wherein the connecting section is provided with a fixed contact, and the fixed contact faces the arc inlet side of the arc extinguishing chamber;

the arc striking piece comprises a body section and an extension section which are connected with each other, wherein the extension section is bent towards the connection section relative to the body section, and one end of the extension section, which is far away from the body section, is connected with the connection section; the extension section is positioned at the arc inlet side, and the body section extends from the arc inlet side to the arc extinguishing chamber;

The static contact is made of non-magnetic conductive materials, and the arc striking piece is made of magnetic conductive materials.

2. The contact mechanism of claim 1, wherein the material of the arc initiation member comprises at least one of iron, nickel, and cobalt.

3. The contact mechanism of claim 1, wherein a surface of the arcing component is coated with a copper layer.

4. A contact mechanism according to any one of claims 1 to 3, wherein the projection of the connecting section is smaller than the projection of the extending section in the arrangement direction of the stationary contact and the arc extinguishing chamber.

5. The contact mechanism of claim 1, wherein the connecting section is substantially parallel to the extension section.

6. The contact mechanism according to claim 1 or 5, wherein a side of the extension section facing the connection section is provided with a solder bump, the solder bump being soldered with the connection section.

7. The contact mechanism of claim 1, wherein the extension Duan Weiping is plate-like or concave.

8. The contact mechanism of claim 1, wherein the extension section is integrally formed with the body section.

9. The contact mechanism of claim 1, wherein the arcing component further comprises first and second opposing side plates, the first and second side plates being connected to the body section proximate the extension section;

the contact mechanism further comprises a first arc isolation piece and a second arc isolation piece, wherein the first arc isolation piece is installed on the first side plate, and the second arc isolation piece is installed on the second side plate.

10. A circuit breaker comprising a housing, an arc chute and a contact mechanism according to any one of claims 1-9, the arc chute and the contact mechanism being mounted within the housing.