CN220856484U - Fixed contact of circuit breaker and circuit breaker - Google Patents

Abstract

The application provides a fixed contact of a circuit breaker and the circuit breaker. The fixed contact comprises a contact part, a connecting part and an extending part, wherein the contact part is used for contacting with a moving contact in the circuit breaker, a current connecting wire is arranged on the moving contact, and when the fixed contact contacts with the moving contact, the current on the current connecting wire is transmitted to the fixed contact; the connecting part is electrically connected with the contact part, and current in the static contact is transmitted to the connecting part; one end of the extension part is electrically connected with the connecting part, and the current in the connecting part is transmitted to the extension part; the other end of the extension part is electrically connected with a conductive system in the circuit breaker, and current in the extension part is transmitted to the conductive system; the extension part, the connecting part and the contact part form a U-shaped loop. The current circulates in the U-shaped loop to form a magnetic field, and an electric arc generated between the moving contact and the fixed contact moves downwards in the magnetic field under the influence of Lorentz force, is far away from the contact point between the moving contact and the fixed contact and is lengthened, so that the arc extinguishing effect is enhanced, and the breaking capacity and the service life of the circuit breaker are further improved.

Description

Fixed contact of circuit breaker and circuit breaker

Technical Field

The application relates to the technical field of electronics, in particular to a fixed contact of a circuit breaker and the circuit breaker.

Background

In the breaking process of the moving contact and the fixed contact in the circuit breaker, an electric arc is generated between the moving contact and the fixed contact, and the generated electric arc can cause the moving contact and the fixed contact to be ablated and damaged; when the movable contact and the fixed contact are severely ablated and damaged, the movable contact cannot collide with the fixed contact in a closing state, so that the current in the circuit breaker cannot be conducted, and the breaking capacity and the service life of the circuit breaker are greatly reduced.

In the prior art, an arc angle is generally arranged in a circuit breaker, and an arc is drawn out through arc striking at the arc angle, so that an arc extinguishing effect is achieved, but the arc is drawn out to a limited extent in an arc striking mode at the arc angle, so that the arc extinguishing effect is poor.

Disclosure of utility model

The application provides a fixed contact of a circuit breaker and the circuit breaker, which solve the problem of poor arc extinguishing effect, and further improve breaking capacity and service life of the circuit breaker.

In a first aspect, the present application provides a stationary contact of a circuit breaker, comprising: a contact portion, a connection portion, and an extension portion; the contact part is used for contacting with a moving contact in the circuit breaker, a current connecting wire is arranged on the moving contact, and when the fixed contact contacts with the moving contact, the current on the current connecting wire is transmitted to the fixed contact; the connecting part is electrically connected with the contact part, and current in the static contact is transmitted to the connecting part; one end of the extension part is electrically connected with the connecting part, and current in the connecting part is transmitted to the extension part; the other end of the extension part is electrically connected with a conductive system in the circuit breaker, and the current in the extension part is transmitted to the conductive system; the extension part, the connecting part and the contact part form a U-shaped loop, the opening of the U-shaped loop faces to the bottom of the circuit breaker, the connecting part is a connecting corner of the U-shaped loop, the contact part is a first supporting leg of the U-shaped loop, and the extension part is a second supporting leg of the U-shaped loop.

Through the fixed contact of the circuit breaker, which is provided by the first aspect, the fixed contact comprises a contact part, a connecting part and an extending part, wherein a moving contact is contacted with the contact part, and a current connecting wire arranged on the moving contact transmits current to the fixed contact; the connecting part is electrically connected with the contact part, the extension part is electrically connected with the connecting part, the current in the static contact is transmitted to the extension part through the connecting part and then flows out of the conductive system connected with the extension part, so that the current in the circuit breaker is circulated, namely, the current in the circuit breaker can be conducted; and the extension part, the connecting part and the contact part form a U-shaped loop, a magnetic field is formed when current flows in the U-shaped loop, an electric arc generated between the moving contact and the fixed contact moves downwards in the magnetic field under the influence of Lorentz force, and the electric arc is far away from a contact point between the moving contact and the fixed contact and is lengthened. The movement and elongation of the arc are beneficial to the cooling and deionization of the arc column, the arc extinguishing effect is enhanced, and the breaking capacity and the service life of the circuit breaker are further improved.

In one possible design, a first bending angle exists between the contact part and the connecting part, so that the contact part is inclined towards the direction of the movable contact; and a second bending angle exists between the extension part and the connecting part, so that the extension part is inclined towards the moving contact.

According to the circuit breaker, the first bending angle exists between the contact part and the connecting part, the contact part inclines towards the direction of the moving contact, the second bending angle exists between the extending part and the connecting part, and the extending part inclines towards the direction of the moving contact, so that the width of the U-shaped circuit is as small as possible, the magnetic field intensity of the U-shaped circuit is further enhanced, the Lorentz force increases in proportion to the magnetic field intensity, the arc extinguishing effect is enhanced, and the breaking capacity and the service life of the circuit breaker are improved.

In one possible design, the contact portion, the connection portion and the extension portion are integrally formed; or the contact part and the connecting part are detachably connected, and the connecting part and the extending part are detachably connected.

According to the embodiment, a person skilled in the art can select an integrally formed structure or a detachable connection structure according to the requirement, and the integrally formed structure can reduce assembly procedures, shorten assembly time and save production cost; the detachable connection can be used for respectively maintaining and replacing the contact part, the connecting part and the extending part, so that the maintenance cost is saved.

In one possible design, the connection is an angular connection corner; or the connecting part is a radian connecting corner.

The connecting portion is used for connecting the contact portion and the connecting portion which are identical in extending direction, so that the shape of the connecting portion is not limited, the connecting portion can be an angle connecting corner or an arc connecting corner, and a person skilled in the art can freely select and match the connecting portion according to installation requirements.

In one possible design, the extension is soldered to the conductive system.

According to the embodiment, the extension part is welded on the conductive system, so that the connection between the extension part and the conductive system is firmer, the stable circulation of current is ensured, and the breaking capacity stability of the circuit breaker is ensured.

In one possible design, the distance between the contact portion and the extension portion is greater than or equal to 3mm.

The minimum distance between the contact portion and the extension portion is 3mm provided by this embodiment, in order to enable a welding space for the welding spot on the extension portion, providing welding conditions for the welded connection between the extension portion and the conductive system.

In one possible design, the stationary contact includes one or more of the extensions; when the static contact comprises a plurality of extending parts, the first extending part of the extending parts is electrically connected with the connecting part, the last extending part of the extending parts is electrically connected with the conductive system, and the rest extending parts are connected between the first extending part and the last extending part.

By providing this embodiment, the length of the second leg will result in a change of the magnetic field strength, and the different number of extensions will result in a different length of the second leg, which can be used by a person skilled in the art according to the actual need to obtain a different magnetic field strength.

In one possible design, the contact portion, the connection portion and the extension portion are all made of red copper.

According to the embodiment, the red copper has good conductivity, and the contact part, the connecting part and the extending part are made of red copper, so that the conductivity of the static contact is ensured.

In a second aspect, the present application provides a circuit breaker comprising: the stationary contact, the housing, the movable contact, and the conductive system of any of the above embodiments; the fixed contact, the moving contact and the conductive system are all arranged in the shell; the movable contact is arranged on the left side of the fixed contact, and the left side is the side close to the contact part; the conductive system is arranged on the right side of the fixed contact, and the right side is the side close to the extension part.

In one possible design, the conductive system is connected to the extension, and when there is a second bending angle between the extension and the connection, the extension is tilted to the left, and the boundary line of the installation position of the conductive system in the housing is also moved to the left.

By the embodiment, since the conductive system is arranged on the right side of the fixed contact, when the boundary line of the installation position of the conductive system in the shell moves to the left side, namely, the installation position of the conductive system is enlarged, the installation of the conductive system is more convenient.

The advantages provided by the second aspect and the possible designs of the second aspect may be referred to the advantages provided by the first aspect and the possible embodiments of the first aspect, and are not described herein.

Drawings

FIG. 1 is a schematic diagram of an embodiment of an interrupt router;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a schematic structural view of a stationary contact according to an embodiment of the present application;

Fig. 4 is a front view of fig. 3.

Reference numerals illustrate:

A 100-circuit breaker;

1-a fixed contact; 11-contact; 111-a first bending angle; 12-connecting part; 121-second bending angle; 13-extensions;

2-a housing;

3-a moving contact; 31-a current connection line;

4-conductive system.

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 and not exclude other matters. The word "a" or "an" does not exclude the presence of a plurality.

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 term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The directional terms appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the static contact and the circuit breaker of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

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, 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. "connected" or "connected" of circuit structures may refer to physical connection, electrical connection or signal connection, for example, direct connection, i.e. physical connection, or indirect connection through at least one element in the middle, so long as circuit communication is achieved, or internal communication between two elements; signal connection may refer to signal connection through a medium such as radio waves, in addition to signal connection through a circuit. 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 present application, a technical solution of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

During the breaking process of the moving contact 3 and the fixed contact 1 in the circuit breaker 100, an electric arc is generated between the moving contact 3 and the fixed contact 1, and the generated electric arc can cause the moving contact 3 and the fixed contact 1 to generate ablation damage; when the movable contact 3 and the fixed contact 1 are severely ablated, the movable contact 3 cannot collide with the fixed contact 1 in a closing state, so that the current in the circuit breaker 100 cannot be conducted, and the breaking capacity and the service life of the circuit breaker 100 are greatly reduced.

The application provides a circuit breaker 100, which realizes the aim of arc extinction by improving the structure of a fixed contact 1 arranged in the circuit breaker 100 under the condition of not adding other arc extinction devices.

As shown in fig. 1, the circuit breaker 100 provided by the application comprises a fixed contact 1, a shell 2, a movable contact 3 and a conductive system 4; the fixed contact 1, the movable contact 3 and the conductive system 4 are all arranged in the shell 2. The closing state of the moving contact 3 and the fixed contact 1 is common knowledge, and the description is not repeated here. Therefore, in the closing state, the moving contact 3 can be considered to be electrically connected to the left side of the fixed contact 1, and the conductive system 4 is electrically connected to the right side of the fixed contact 1; the moving contact 3 is provided with a current connecting wire 31, and current in the current connecting wire 31 sequentially flows through the moving contact 3, the fixed contact 1 and the conductive system 4.

Specifically, as shown in fig. 2, the stationary contact 1 in the present application includes: a contact portion 11, a connection portion 12, and an extension portion 13; the contact part 11 is contacted with the movable contact 3, and the current on the current connecting wire 31 is transmitted to the contact part 11; the connection part 12 is electrically connected with the contact part 11, and the current in the contact part 11 is transmitted to the connection part 12; one end of the extension part 13 is electrically connected with the connection part 12, and the current in the connection part 12 is transmitted to the extension part 13; the other end of the extension 13 is electrically connected to the conductive system 4, and the current in the extension 13 is transferred to the conductive system 4. The current connecting wire 31 arranged on the moving contact 3 transmits current to the fixed contact 1; the current in the static contact 1 is transmitted to the extension part 13 through the connection part 12 and then flows out of the conductive system 4 connected with the extension part 13, so that the current in the circuit breaker 100 can flow, i.e. the current in the circuit breaker 100 can be conducted.

Further, as shown in fig. 2, 3 and 4, the extension portion 13, the connection portion 12 and the contact portion 11 form a U-shaped loop (not shown in the drawings), the opening of the U-shaped loop faces the bottom of the circuit breaker 100, the connection portion 12 is a connection corner (not shown in the drawings) of the U-shaped loop, the contact portion 11 is a first leg (not shown in the drawings) of the U-shaped loop, and the extension portion 13 is a second leg (not shown in the drawings) of the U-shaped loop.

The extension part 13, the connecting part 12 and the contact part 11 form a U-shaped loop, a magnetic field is formed when current flows in the U-shaped loop, and an electric arc generated between the moving contact 3 and the fixed contact 1 moves downwards in the magnetic field under the influence of Lorentz force, is far away from a contact point between the moving contact 3 and the fixed contact 1 and is elongated. The movement and elongation of the arc contributes to the cooling and deionization of the arc column, enhancing the arc extinguishing effect, and thus improving the breaking capacity and the service life of the circuit breaker 100.

Specifically, as shown in fig. 3 and 4, a first bending angle 111 exists between the contact portion 11 and the connection portion 12, so that the contact portion 11 is inclined toward the moving contact 3; a second bending angle 131 exists between the extension portion 13 and the connection portion 12, so that the extension portion 13 is inclined towards the moving contact 3.

According to the embodiment, when the first bending angle 111 exists between the contact part 11 and the connecting part 12, the contact part 11 inclines towards the moving contact 3, the second bending angle 131 exists between the extending part 13 and the connecting part 12, and the extending part 13 inclines towards the moving contact 3, so that the width of the U-shaped loop is as small as possible, the magnetic field intensity of the U-shaped loop is further enhanced, the Lorentz force is increased in proportion to the magnetic field intensity, the arc extinguishing effect is enhanced, and the breaking capacity and the service life of the circuit breaker 100 are improved.

In some embodiments, as shown in fig. 3 and 4, the contact portion 11, the connection portion 12, and the extension portion 13 are integrally formed.

The integrated structure can reduce the assembly process, shorten the assembly time and save the production cost.

Optionally, the contact portion 11 is detachably connected to the connection portion 12, and the connection portion 12 is detachably connected to the extension portion 13.

The detachable connection can be used for respectively maintaining and replacing the contact part 11, the connecting part 12 and the extension part 13, so that the maintenance cost is saved.

Those skilled in the art can select the above-mentioned integrally formed structure or the detachable connection structure according to their needs.

In some embodiments, as shown in fig. 3 and 4, the connection 12 is an angular connection turn.

Alternatively, the connecting portion 12 may be a curved connecting corner.

The connecting portion 12 is used for connecting the contact portion 11 and the connecting portion 12 with the same extending direction, so that the shape of the connecting portion 12 is not limited, and the connecting portion can be an angle connecting corner or an arc connecting corner, and a person skilled in the art can freely select and match according to installation requirements.

In some embodiments, as shown in fig. 1 and 2, the extension 13 is welded to the conductive system 4. The extension part 13 is welded on the conductive system 4, so that the connection between the extension part 13 and the conductive system 4 is firmer, and the stable circulation of current is ensured, thereby ensuring the stability of the breaking capacity of the circuit breaker 100.

Further, as shown in fig. 3 and 4, the distance between the contact portion 11 and the extension portion 13 is greater than or equal to 3mm. Since the extension 13 is welded to the conductive system 4, there is a welding spot on the extension 13 that is required for welding, and the minimum distance between the contact 11 and the extension 13 is 3mm, so that there is a welding space on the extension 13 that can be used for welding the extension 13 to the conductive system 4, and welding conditions are provided for the welded connection between the extension 13 and the conductive system 4.

In some embodiments, as shown in fig. 3 and 4, the stationary contact 1 includes an extension portion 13, and a U-shaped loop formed by the extension portion 13, the contact portion 11, and the connection portion 12 as shown in fig. 3 and 4, where the magnetic field provided by the U-shaped loop is sufficient to achieve an effective arc extinguishing effect.

Optionally, the stationary contact 1 comprises a plurality of extensions 13; when the stationary contact 1 includes a plurality of extending portions 13, a first extending portion 13 of the plurality of extending portions 13 is electrically connected to the connecting portion 12, a last extending portion 13 of the plurality of extending portions 13 is electrically connected to the conductive system 4, and the remaining extending portions 13 are connected between the first extending portion 13 and the last extending portion 13.

The length of the second leg can lead to the change of the magnetic field intensity, through the scheme, the second leg can be provided with different lengths through the extension parts 13 with different numbers, and a person skilled in the art can adopt the extension parts 13 with different numbers according to actual needs to obtain different magnetic field intensities.

In some embodiments, the contact portion 11, the connection portion 12 and the extension portion 13 are made of red copper.

Red copper, also called red copper, has good electrical conductivity and thermal conductivity, excellent plasticity, is easy to be processed by hot pressing and cold pressing, and is widely used for manufacturing products with good electrical conductivity, such as wires, cables, electric brushes, special electric spark etching copper, and the like; the contact part 11, the connecting part 12 and the extending part 13 are made of red copper, so that the conductivity of the static contact 1 is ensured.

Further, as shown in fig. 2, the conductive system 4 is connected to the extension portion 13, and when there is a second bending angle 131 between the extension portion 13 and the connection portion 12, the extension portion 13 is inclined to the left, and the boundary line of the installation position of the conductive system 4 in the housing 2 is also moved to the left.

By this embodiment, since the conductive system 4 is mounted on the right side of the stationary contact 1, the mounting of the conductive system 4 is facilitated when the boundary line of the mounting position of the conductive system 4 in the housing 2 is moved to the left side, i.e., the mounting position of the conductive system 4 becomes large.

In summary, the present application provides a stationary contact 1 of a circuit breaker 100 and the circuit breaker 100. The fixed contact 1 comprises a contact part 11, a connecting part 12 and an extending part 13, the moving contact 3 is in contact with the contact part 11, and a current connecting wire 31 arranged on the moving contact 3 transmits current to the fixed contact 1; the connecting part 12 is electrically connected with the contact part 11, the extension part 13 is electrically connected with the connecting part 12, the current in the static contact 1 is transmitted to the extension part 13 through the connecting part 12 and then flows out of the conductive system 4 connected with the extension part 13, so that the current in the circuit breaker 100 flows, namely, the current in the circuit breaker 100 can be conducted; and the extension part 13, the connecting part 12 and the contact part 11 form a U-shaped loop, a magnetic field is formed when current flows in the U-shaped loop, and an electric arc generated between the moving contact 3 and the fixed contact 1 moves downwards in the magnetic field under the influence of Lorentz force, is far away from the contact point between the moving contact 3 and the fixed contact 1 and is elongated. The movement and elongation of the arc contributes to the cooling and deionization of the arc column, enhancing the arc extinguishing effect, and thus improving the breaking capacity and the service life of the circuit breaker 100.

Those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; 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 stationary contact of a circuit breaker, comprising: a contact portion, a connection portion, and an extension portion;

The contact part is used for contacting with a moving contact in the circuit breaker, a current connecting wire is arranged on the moving contact, and when the fixed contact contacts with the moving contact, the current on the current connecting wire is transmitted to the fixed contact;

The connecting part is electrically connected with the contact part, and current in the static contact is transmitted to the connecting part;

one end of the extension part is electrically connected with the connecting part, and current in the connecting part is transmitted to the extension part;

The other end of the extension part is electrically connected with a conductive system in the circuit breaker, and the current in the extension part is transmitted to the conductive system;

The extension part, the connecting part and the contact part form a U-shaped loop, the opening of the U-shaped loop faces to the bottom of the circuit breaker, the connecting part is a connecting corner of the U-shaped loop, the contact part is a first supporting leg of the U-shaped loop, and the extension part is a second supporting leg of the U-shaped loop.

2. The stationary contact according to claim 1, wherein a first bending angle exists between the contact portion and the connection portion, so that the contact portion is inclined toward the moving contact; and a second bending angle exists between the extension part and the connecting part, so that the extension part is inclined towards the moving contact.

3. The stationary contact of claim 2, wherein the contact portion, the connection portion, and the extension portion are integrally formed;

Or the contact part and the connecting part are detachably connected, and the connecting part and the extending part are detachably connected.

4. The stationary contact of claim 2, wherein the connection portion is an angular connection corner;

Or alternatively

The connecting part is a radian connecting corner.

5. The stationary contact of claim 2, wherein the extension is welded to the conductive system.

6. The stationary contact of claim 5, wherein a distance between the contact portion and the extension portion is greater than or equal to 3mm.

7. The stationary contact of claim 2, wherein the stationary contact comprises one or more of the extensions; when the static contact comprises a plurality of extending parts, the first extending part of the extending parts is electrically connected with the connecting part, the last extending part of the extending parts is electrically connected with the conductive system, and the rest extending parts are connected between the first extending part and the last extending part.

8. The stationary contact of claim 7, wherein the contact portion, the connection portion and the extension portion are all made of red copper.

9. A circuit breaker comprising the stationary contact of any one of claims 1-8, a housing, a moving contact, and a conductive system;

The fixed contact, the moving contact and the conductive system are all arranged in the shell;

the movable contact is arranged on the left side of the fixed contact, and the left side is the side close to the contact part;

The conductive system is arranged on the right side of the fixed contact, and the right side is the side close to the extension part.

10. The circuit breaker according to claim 9, wherein the conductive system is connected to the extension portion, and when there is a second bending angle between the extension portion and the connection portion, the extension portion is inclined to the left, and a boundary line of an installation position of the conductive system in the housing is also moved to the left.