CN216671542U

CN216671542U - Arc striking structure and circuit breaker

Info

Publication number: CN216671542U
Application number: CN202123087071.4U
Authority: CN
Inventors: 廖茹嘉; 彭琼; 杨沫; 于云
Original assignee: Shanghai Liangxin Electrical Co Ltd
Current assignee: Shanghai Liangxin Electrical Co Ltd
Priority date: 2021-12-09
Filing date: 2021-12-09
Publication date: 2022-06-03
Anticipated expiration: 2031-12-09

Abstract

The utility model discloses an arc striking structure and a circuit breaker, and relates to the technical field of low-voltage electrical appliances. The arc striking structure comprises a first arc striking piece, wherein the first arc striking piece comprises a first connecting part and a second connecting part which are oppositely arranged, and a winding part which is connected with the first connecting part and the second connecting part, the first connecting part is used for being connected with a current conducting plate of a circuit breaker, the second connecting part is positioned on the side surface of an arc extinguishing chamber of the circuit breaker, a winding space is formed in the winding part in a surrounding mode, and a closed magnetic field is formed in the winding space. The arc striking structure provided by the utility model can be used for striking an arc, and can enable an electric arc to be quickly and effectively transferred to an arc extinguishing chamber to be extinguished even under the condition that an arc runner is long in size.

Description

Arc striking structure and circuit breaker

Technical Field

The utility model relates to the technical field of low-voltage electric appliances, in particular to an arc striking structure and a circuit breaker.

Background

When a short-circuit large current occurs in the circuit, the circuit breaker can quickly break the circuit, so that the power grid is prevented from being damaged. When the breaker breaks the current, electric arcs can be generated, if the electric arcs can not be separated from the starting and static contacts at a high speed and are introduced into the arc extinguish chamber, the broken current can fail or the surfaces of the starting and static contacts are seriously burnt, so that the service life of the breaker is influenced.

In the prior art, an arc striking structure is usually installed near a static contact to artificially set a passage for electric arc, so that the electric arc is quickly separated from the static contact and enters an arc extinguishing chamber. However, in the conventional arc striking structure, when the size of the arc runner becomes long, the arc striking force is reduced, and the transfer speed and effect of the arc are weakened.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an arc striking structure and a circuit breaker, which can provide stronger arc blowing force and enable electric arcs to be rapidly transferred to an arc extinguishing chamber.

The embodiment of the utility model is realized by the following steps:

the utility model provides an arc ignition structure, its includes first striking piece, and first striking piece is including relative first connecting portion and the second connecting portion that sets up to and the winding portion of connecting first connecting portion and second connecting portion, first connecting portion are used for being connected with the current conducting plate of circuit breaker, and the second connecting portion are located the side of the explosion chamber of circuit breaker, and the enclosure forms the coiling space in the winding portion, is used for forming closed magnetic field in the coiling space.

Optionally, as an implementable manner, the arc striking structure further includes a second arc striking plate, one end of the second arc striking plate is connected with the fixed contact of the circuit breaker, the other end of the second arc striking plate is located on a side surface of the arc extinguishing chamber, and the first arc striking plate and the second arc striking plate are respectively located on two opposite sides of the arc extinguishing chamber.

Optionally, as an implementable manner, the winding portion is divided into a first bending region, the second arc striking sheet is divided into a second bending region opposite to the first bending region, and a first bending point of the first bending region and a second bending point of the second bending region are close to each other to form a tightening structure.

Optionally, as an implementable manner, the first end of the winding portion is located in the winding space, the second end of the winding portion is located outside the winding space, the first connection portion is connected to the first end of the winding portion, the first connection portion is U-shaped, and an open end of the first connection portion straddles the winding portion to be connected to the conductive plate.

Optionally, as an implementable manner, the first end of the winding portion is located in the winding space, the second end of the winding portion is located outside the winding space, the winding portion is provided with an opening, one end of the first connecting portion is connected with the first end of the winding portion, and the other end of the first connecting portion passes through the opening and is connected with the conductive plate.

Optionally, as an implementable manner, the second connecting portion is cross-shaped, the second connecting portion includes a first connecting end and a first fixing end and a second fixing end adjacent to the first connecting end, the first connecting end is connected with the winding portion, and the first fixing end and the second fixing end are respectively inserted into the case of the circuit breaker.

Optionally, as an implementable manner, the first arc striking plate is integrally formed.

A circuit breaker comprises a housing and an arc striking structure as above arranged in the housing.

Optionally, as an implementable mode, the circuit breaker further includes a conductive plate disposed in the housing, the conductive plate is provided with a notch, a winding portion of the first arc striking piece of the arc striking structure is divided into a straight region, and the straight region is embedded in the notch.

Optionally, as an implementable manner, a boss is disposed on one side of the conductive plate facing the first arc starting sheet, and the first connecting portion of the first arc starting sheet is connected to the surface of the conductive plate and the side wall of the boss.

The embodiment of the utility model has the beneficial effects that:

the utility model provides an arc striking structure which comprises a first arc striking piece, wherein the first arc striking piece comprises a first connecting part and a second connecting part which are oppositely arranged, and a winding part which is connected with the first connecting part and the second connecting part, the first connecting part is used for being connected with a current conducting plate of a circuit breaker, the second connecting part is positioned on the side surface of an arc extinguishing chamber of the circuit breaker, a winding space is formed in the winding part in an enclosing mode, and a closed magnetic field is formed in the winding space. The middle part of the first arc striking piece in the arc striking structure is arranged in a shape like a Chinese character 'hui', so that even if the size of an arc runner is longer, stronger arc blowing force can be provided, and electric arc can be quickly and effectively transferred to an arc extinguishing chamber to be extinguished.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a circuit breaker according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a first arc striking plate in an arc striking structure according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an arc striking structure according to an embodiment of the present invention;

fig. 4 is a schematic view illustrating an installation of a first arc ignition piece in the arc ignition structure according to an embodiment of the present invention.

Icon: 100-arc starting structure; 110-a first arc striking sheet; 111-a first connection; 112-a winding; 1121 — first bending point; 1122-flat area; 113-a second connection; 120-a second arc striking sheet; 121-second bending point; 130-an arc path; 200-a circuit breaker; 210-a conductive plate; 211-notches; 212-a boss; 220-an arc extinguishing chamber; 230-a static contact; 240-housing.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "vertical", "horizontal", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally placed when the products of the present invention are used, and are only used for convenience of description and simplification of description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. The terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

When the circuit breaker is used for breaking current, electric arcs can be generated, enter the arc extinguish chamber and are divided to extinguish. If the electric arc burns on the moving contact and the static contact for a long time and is not led into the arc extinguish chamber, the breaking current failure can be caused; even if the arc can be introduced into the arc extinguishing chamber, if the moving contact and the static contact can not be separated at a fast speed, a great deal of burning loss on the surfaces of the moving contact and the static contact can still be caused, thereby affecting the whole electric service life of the circuit breaker.

At present, an arc striking structure is generally installed near a static contact, and an arc is guided by the arc striking structure to rapidly separate from the static contact and enter an arc extinguishing chamber. However, in the conventional arc striking structure, when the size of the arc runner is lengthened, the arc striking force is reduced, and the transfer speed and effect of the arc are weakened.

In order to solve the above problems, an embodiment of the present invention provides an arc striking structure 100 that provides a strong arc striking force by changing the structure and shape of a first arc striking plate 110, and enables an arc to be rapidly transferred to an arc extinguishing chamber 220 even in the case that the size of an arc runner is long.

Referring to fig. 1 to 3, the present embodiment provides an arc striking structure 100, which includes a first arc striking plate 110, where the first arc striking plate 110 includes a first connecting portion 111 and a second connecting portion 113 that are oppositely disposed, and a winding portion 112 that connects the first connecting portion 111 and the second connecting portion 113, the first connecting portion 111 is used for connecting with a conductive plate 210 of a circuit breaker 200, the second connecting portion 113 is located at a side surface of an arc extinguishing chamber 220 of the circuit breaker 200, a winding space is formed in the winding portion 112 in an enclosing manner, and the winding space is used for forming a closed magnetic field.

The arc striking structure 100 includes a first arc striking plate 110, the first arc striking plate 110 includes a first connection portion 111, a winding portion 112, and a second connection portion 113 that are connected in sequence, the first connection portion 111 and the second connection portion 113 are disposed at both sides of the winding portion 112, the first connection portion 111 is used for being connected with a conductive plate 210 of the circuit breaker 200, and the second connection portion 113 extends to a side surface of the arc extinguishing chamber 220. The plate body forming the winding part 112 has a first end and a second end opposite to each other, after the plate body is bent 360 degrees around the first end, the second end crosses the first end to form a winding space in a surrounding manner, and the projection of the winding space in the direction perpendicular to the side surface of the plate body is in a shape of Chinese character 'hui'. The current on the conductive plate 210 flows into the first arc runner 110 through the first connection portion 111, and changes direction when flowing through the winding portion 112 under the influence of the shape of the winding portion 112, thereby forming a closed magnetic field in the winding space. The closed magnetic field provides a strong blowing force so that the arc is quickly and efficiently transferred to the arc chute 220.

In this embodiment, the processing manner of the first arc starting sheet 110 is not limited, as long as the middle portion of the first arc starting sheet 110 has a zigzag structure and has a winding space capable of forming a closed magnetic field. The first tab 110 may be formed by bending a plate-shaped material 360 °, or may be formed by connecting a plurality of plate-shaped materials.

As described above, the arc striking structure 100 includes the first arc striking plate 110, the first arc striking plate 110 includes the first connecting portion 111 and the second connecting portion 113 that are oppositely disposed, and the winding portion 112 that connects the first connecting portion 111 and the second connecting portion 113, the first connecting portion 111 is used for connecting with the conductive plate 210 of the circuit breaker 200, the second connecting portion 113 is located at the side of the arc extinguishing chamber 220 of the circuit breaker 200, a winding space is formed in the winding portion 112 in a surrounding manner, and the winding space is used for forming a closed magnetic field. The middle portion of the first arc striking plate 110 in the arc striking structure 100 is arranged in a shape of a Chinese character 'hui', which can provide a strong arc blowing force even when the size of the arc runner is long, so that the arc can be quickly and effectively transferred to the arc extinguishing chamber 220 to be extinguished.

Alternatively, in an achievable manner of the embodiment of the present invention, the first end of the winding portion 112 is located in the winding space, the second end of the winding portion 112 is located outside the winding space, the first connection portion 111 is connected to the first end of the winding portion 112, the first connection portion 111 is U-shaped, and the open end of the first connection portion 111 crosses over the winding portion 112 and is connected to the conductive plate 210.

The winding portion 112 has a first end and a second end disposed opposite to each other, the first end being surrounded by the plate body forming the winding portion 112 and located inside the winding space, and the second end being located outside the winding space. In this embodiment, the first connecting portion 111 is U-shaped, and has a straight end and an open end, the straight end is located inside the winding space and is fixedly connected to the first end of the winding portion 112, and the open end crosses over the plate body forming the winding portion 112 and is fixedly connected to the conductive plate 210.

In order to improve the connection stability between the first connection portion 111 and the conductive plate 210 and save space, the first connection portion 111 is, for example, V-shaped, the side surface of the open end of the first connection portion 111 is parallel to the plate surface of the conductive plate 210, and after the first connection portion 111 is connected to the conductive plate 210, the side surface of the open end is attached to the plate surface of the conductive plate 210.

Optionally, in an achievable manner of the embodiment of the present invention, the first end of the winding portion 112 is located in the winding space, the second end of the winding portion 112 is located outside the winding space, an opening is provided on the winding portion 112, and one end of the first connection portion 111 is connected to the first end of the winding portion 112, and the other end of the first connection portion passes through the opening to be connected to the conductive plate 210.

The winding portion 112 has a first end and a second end disposed opposite to each other, the first end being surrounded by the plate body forming the winding portion 112 and located inside the winding space, and the second end being located outside the winding space. In this embodiment, an opening is formed on the plate body forming the winding portion 112 at a position corresponding to the first end of the winding portion 112, the first connecting portion 111 is disposed through the opening, one end of the first connecting portion is fixedly connected to the first end of the winding portion 112, and the other end of the first connecting portion is fixedly connected to the conductive plate 210.

Also, in order to improve the connection stability between the first connection portion 111 and the conductive plate 210 and save space, the first connection portion 111 is, for example, V-shaped, a side surface of one end of the first connection portion 111 is parallel to a plate surface of the conductive plate 210, and after the first connection portion 111 is connected to the conductive plate 210, the side surface of one end is attached to the plate surface of the conductive plate 210.

Alternatively, in an implementation manner of the embodiment of the present invention, the second connection portion 113 is cross-shaped, and the second connection portion 113 includes a first connection end and a first fixed end and a second fixed end adjacent to the first connection end, the first connection end is connected to the winding portion 112, and the first fixed end and the second fixed end are respectively inserted into the housing 240 of the circuit breaker 200.

The second connecting portion 113 is cross-shaped, and includes a first connecting end and a second connecting end which are oppositely disposed, and a first fixing end and a second fixing end which are oppositely disposed, the first connecting end is fixedly connected to the second end of the winding portion 112, and the first fixing end and the second fixing end are respectively inserted into the housing 240 of the circuit breaker 200 to fix the first arc guiding plate 110.

Alternatively, in an implementation manner of the embodiment of the present invention, the first arc guiding plate 110 is integrally formed.

The first arc striking piece 110 is integrally formed and formed by bending a plate-shaped material for multiple times, and the integrally formed first arc striking piece 110 is simple in process, high in processing speed, stable in structure and capable of bearing high temperature.

Referring to fig. 1 and fig. 3, optionally, in an implementation manner of the embodiment of the present invention, the arc starting structure 100 further includes a second arc starting sheet 120, one end of the second arc starting sheet 120 is connected to the fixed contact 230 of the circuit breaker 200, and the other end is located on a side surface of the arc extinguishing chamber 220, and the first arc starting sheet 110 and the second arc starting sheet 120 are respectively located on two opposite sides of the arc extinguishing chamber 220.

The arc striking structure 100 further includes a second arc striking plate 120, the first arc striking plate 110 and the second arc striking plate 120 are respectively disposed at two sides of the arc extinguishing chamber 220, one end of the second arc striking plate 120 is connected to the fixed contact 230 of the circuit breaker 200, and the other end extends to a side surface of the arc extinguishing chamber 220. An arc channel 130 is formed between the first arc striking piece 110 and the second arc striking piece 120, the arc channel 130 extends to the arc extinguish chamber 220, the movable contact and the fixed contact 230 are located in the arc channel 130, and the arc between the movable contact and the fixed contact is led to the arc extinguish chamber 220 to be extinguished by a magnetic field generated after the first arc striking piece 110 and the second arc striking piece 120 are electrified.

Alternatively, in an implementation manner of the embodiment of the present invention, the winding portion 112 is divided into a first bending region, the second arc striking piece 120 is divided into a second bending region opposite to the first bending region, and the first bending point 1121 of the first bending region and the second bending point 121 of the second bending region are close to each other to form a tightening structure.

A first bending region is defined on one side of the winding portion 112 facing the second tab 120, the first bending region has a first bending point 1121, and a second bending region is defined on one side of the second tab 120 facing the winding portion 112, and the second bending region has a second bending point 121. The first bending point and the second bending point are close to each other, so that the channel between the first tab 110 and the second tab 120 is narrowed at the connection line of the first bending point 1121 and the second bending point 121.

In the arc extinguishing process, the electric arc moves in the electric arc channel 130 between the first arc striking plate 110 and the second arc striking plate 120, the section of the electric arc channel 130 is changed from big to small and then big, by utilizing the Laval nozzle principle, the flow speed of the electric arc is changed due to the change of the section, the section of the front end of the narrow part is changed from big to small, the flow speed is changed from small to big, the flow speed of the electric arc exceeds the sound speed at the moment, the section of the rear end of the narrow part is changed from small to big, transonic fluid does not follow the flow speed of the small part of the section any more, the flow speed of the large part of the section is small, but is just opposite, the flow speed is larger, and the flow speed is larger, so the electric arc flow speed is always in an acceleration state in the moving process of the electric arc channel 130 until the electric arc flows into the arc extinguishing chamber 220.

Referring to fig. 1, an embodiment of the present invention further discloses a circuit breaker 200, which includes a housing 240 and the arc striking structure 100 disposed in the housing 240.

The circuit breaker 200 includes the same structure and advantageous effects as the arc striking structure 100 in the foregoing embodiment. The structure and the advantages of the arc striking structure 100 have been described in detail in the foregoing embodiments, and are not described in detail herein.

Referring to fig. 4, in an optional manner, in an implementation manner of the embodiment of the present invention, the circuit breaker 200 further includes a conductive plate 210 disposed in the housing 240, the conductive plate 210 is provided with a notch 211, the winding portion 112 of the first arc striking plate 110 of the arc striking structure 100 is divided into a straight region 1122, and the straight region 1122 is embedded in the notch 211.

The conductive plate 210 is disposed in the housing 240, the first arc striking plate 110 is disposed on one side of the conductive plate 210 far from the housing 240, a notch 211 penetrating through the plate surface is disposed at a position of the conductive plate 210 corresponding to the winding portion 112 of the first arc striking plate 110, a straight region 1122 is divided on the winding portion 112, the straight region 1122 is parallel to the conductive plate 210, and the parallel region is embedded into the notch 211 of the conductive plate 210, so that the connection between the first arc striking plate 110 and the conductive plate 210 is more compact, and the space in the housing 240 of the circuit breaker 200 is saved.

Alternatively, in an achievable manner of the embodiment of the present invention, the conductive plate 210 is provided with a boss 212 on a side facing the first arc runner 110, and the first connection portion 111 of the first arc runner 110 is connected to both the surface of the conductive plate 210 and a side wall of the boss 212.

The conducting plate 210 is equipped with boss 212 towards one side of first run-on plate 110, and the first connecting portion 111 of first run-on plate 110 is connected with the surface of conducting plate 210 and the lateral wall of boss 212 simultaneously, and the setting of boss 212 both can carry on spacingly to first run-on plate 110, can also improve the stability of being connected between first run-on plate 110 and the conducting plate 210.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides an arc ignition structure (100), its characterized in that includes first arc ignition piece (110), first arc ignition piece (110) is including relative first connecting portion (111) and the second connecting portion (113) that set up, and connects first connecting portion (111) with coiling portion (112) of second connecting portion (113), first connecting portion (111) are used for being connected with current conducting plate (210) of circuit breaker (200), second connecting portion (113) are located the side of explosion chamber (220) of circuit breaker (200), it has the coiling space to enclose to form in coiling portion (112), be used for forming closed magnetic field in the coiling space.

2. The arc striking structure (100) according to claim 1, further comprising a second arc striking plate (120), wherein one end of the second arc striking plate (120) is connected to a fixed contact (230) of the circuit breaker (200), and the other end of the second arc striking plate is located at a side surface of the arc extinguishing chamber (220), and the first arc striking plate (110) and the second arc striking plate (120) are respectively located at two opposite sides of the arc extinguishing chamber (220).

3. The arc striking structure (100) according to claim 2, wherein a first bending region is defined on the winding portion (112), a second bending region opposite to the first bending region is defined on the second arc striking sheet (120), and a first bending point (1121) of the first bending region and a second bending point (121) of the second bending region are close to each other to form a tightening structure.

4. The arc ignition structure (100) according to claim 1, wherein a first end of the winding portion (112) is located inside the winding space, a second end of the winding portion (112) is located outside the winding space, the first connection portion (111) is connected to the first end of the winding portion (112), the first connection portion (111) is U-shaped, and an open end of the first connection portion (111) is connected to the conductive plate (210) across the winding portion (112).

5. The arc ignition structure (100) according to claim 1, wherein a first end of the winding portion (112) is located in the winding space, a second end of the winding portion (112) is located outside the winding space, an opening is provided on the winding portion (112), one end of the first connection portion (111) is connected to the first end of the winding portion (112), and the other end passes through the opening to be connected to the conductive plate (210).

6. The arc initiation structure (100) of claim 1, wherein the second connection portion (113) is cross-shaped, the second connection portion (113) comprises a first connection end and a first fixing end and a second fixing end adjacent to the first connection end, the first connection end is connected with the winding portion (112), and the first fixing end and the second fixing end are respectively inserted into a housing (240) of the circuit breaker (200).

7. The arc ignition structure (100) according to claim 1, wherein the first arc ignition sheet (110) is integrally formed.

8. A circuit breaker (200) comprising a housing (240) and the arc initiation structure (100) of any of claims 1 to 7 disposed within the housing (240).

9. The circuit breaker (200) of claim 8, further comprising a conductive plate (210) disposed in the housing (240), wherein a notch (211) is disposed on the conductive plate (210), and a straight region (1122) is divided on the winding portion (112) of the first arc striking plate (110) of the arc striking structure (100), and the straight region (1122) is embedded in the notch (211).

10. The circuit breaker (200) of claim 8, wherein a surface of the conductive plate (210) facing the first arc runner (110) is provided with a boss (212), and the first connection portion (111) of the first arc runner (110) is simultaneously connected with the surface of the conductive plate (210) and a sidewall of the boss (212).