CN117238710A

CN117238710A - Isolating switch, contact unit and arc striking structure thereof

Info

Publication number: CN117238710A
Application number: CN202210628892.4A
Authority: CN
Inventors: 韩畅
Original assignee: Delixi Electric Co Ltd
Current assignee: Delixi Electric Co Ltd
Priority date: 2022-06-06
Filing date: 2022-06-06
Publication date: 2023-12-15
Also published as: WO2023236911A1

Abstract

The application discloses an arc striking structure, which is used for a contact unit, wherein the contact unit comprises a shell, a fixed contact module and a moving contact module which are arranged on the shell, and a magnetic generating piece which is arranged on the shell, wherein the magnetic generating piece is provided with a first magnetic field area and a second magnetic field area on two sides of a parting surface, and the parting surface is a central surface in the moving direction of the moving contact module; the magnetic induction lines of the first magnetic field areas positioned at two sides of the dividing plane have the same direction, and the magnetic induction lines of the second magnetic field areas positioned at two sides of the dividing plane have opposite directions; a second magnetic field region facing the first side or the second side of the split surface in a direction of a first lorentz force F1 generated by the first magnetic field region on the arc; the direction of a second lorentz force F2 generated by the second magnetic field region on the electric arc faces to the outer side of the moving contact module moving region; the first magnetic field region is closer to the parting plane than the second magnetic field region. The application has no polarity requirement on the butt line, and avoids the problem of switch burnout caused by reverse connection of the current direction. The application also discloses an isolating switch and a contact unit.

Description

Isolating switch, contact unit and arc striking structure thereof

Technical Field

The application relates to the technical field of electrical switches, in particular to an isolating switch, a contact unit and an arc striking structure thereof.

Background

The isolating switch is used for preventing or allowing current to flow in the energized state, so that the part of the power distribution device, which is required to have power failure, is reliably isolated from the electrified part. The isolating switch is widely applied to power systems, such as photovoltaic, wind power and the like, and generally comprises a rotary switch and a translational switch according to different switch actions.

The isolating switch is generally formed by stacking a plurality of contact units, wherein each contact unit comprises a shell, a first fixed contact, a second fixed contact and a moving contact, wherein the first fixed contact, the second fixed contact and the moving contact are arranged in the shell, and the moving contact can reciprocate between a first position and a second position. When the movable contact is positioned at the first position, the first end part and the second end part can be respectively contacted with the first fixed contact and the second fixed contact, so that the conduction of a circuit is realized; when the movable contact is positioned at the second position, the first end part and the second end part can be separated from the first fixed contact and the second fixed contact respectively, so that the disconnection of a circuit is realized. The movable contact of each layer of contact unit of the rotary switch is connected to a rotating shaft, and the action of the movable contact of each layer of contact unit is controlled by driving the rotating shaft.

When the movable contact and the fixed contact of the isolating switch are disconnected, an arc can be generated between the movable contact and the fixed contact, a plurality of arc extinguishing modes exist in the prior art, and magnetic quenching is one of the common arc extinguishing modes. The lorentz force generated by the magnetic field on the electric arc lengthens the electric arc so as to achieve the effect of breaking the electric arc. However, the current magnetic quenching method has a requirement on the current direction, when the current direction is connected, the magnetic field generates lorentz force for elongating the arc, and when the current direction is reversely connected, the magnetic field generates lorentz force for compressing the arc, so that the isolating switch is burnt.

Therefore, how to avoid the problem of switch burnout caused by reverse connection of the current direction is a technical problem that needs to be solved by those skilled in the art.

Disclosure of Invention

Therefore, the present application aims to provide an arc striking structure, which is used for avoiding the problem of switch burnout caused by reverse connection of current direction due to no polarity requirement of a butt line;

another object of the present application is to provide a disconnector and a contact unit having the above-mentioned arcing structure.

In order to achieve the above object, the present application provides the following technical solutions:

the arc striking structure is used for a contact unit, the contact unit comprises a shell, a fixed contact module and a moving contact module which are arranged on the shell, and a magnetic generating piece which is arranged on the shell, wherein a first magnetic field area and a second magnetic field area are generated on two sides of a split section, and the split section is a central surface in the moving direction of the moving contact module;

the magnetic induction lines of the first magnetic field areas positioned at two sides of the breaking surface have the same direction, and the magnetic induction lines of the second magnetic field areas positioned at two sides of the breaking surface have opposite directions;

the first magnetic field region is used for generating a first Lorentz force F1 on the electric arc, and the direction of the first Lorentz force F1 is towards the second magnetic field region on the first side or the second side of the split surface;

the direction of a second Lorentz force F2 generated by the second magnetic field region on the electric arc faces the outer side of the moving contact module moving region;

the first magnetic field region is closer to the breaking plane than the second magnetic field region.

Optionally, in the arc striking structure, the first magnetic field regions located at two sides of the breaking surface are symmetrical along the breaking surface; and/or

The second magnetic field regions positioned at two sides of the dividing plane are symmetrical along the dividing plane.

Optionally, in the above arc striking structure, a direction of the first lorentz force F1 is perpendicular to the breaking plane; and/or

The direction of the second lorentz force F2 is parallel to the parting plane.

Optionally, in the above arc striking structure, the magnetism generating part is disposed outside a moving-contact module movement-sweeping area.

Optionally, in the above arc striking structure, the number of the fixed contact modules is two, each fixed contact module has a fixed contact, the moving contact module has two moving contacts, when the moving contact module is in the first position, the two moving contacts of the moving contact module are respectively contacted with the fixed contacts of the two fixed contact modules, so as to realize the conduction of a circuit; when the movable contact module is positioned at the second position, the two movable contacts of the movable contact module are separated from the fixed contacts of the two fixed contact modules respectively, so that the disconnection of a circuit is realized;

each movable contact of the movable contact module is correspondingly provided with the magnetic generating piece;

the magnetism generating piece is arranged outside the moving contact movement sweeping area corresponding to the magnetism generating piece.

Optionally, in the above arc striking structure, the moving contact module is a rotary moving contact module, the housing is provided with an exhaust channel for arc blowing, and the magnetism generating member is disposed in a region between the fixed contact module and the exhaust channel corresponding thereto.

Optionally, in the above arc striking structure, the moving contact module is a translational moving contact module, and the magnetism generating member is disposed in a region between the second position of the translational moving contact module and the fixed contact module corresponding to the magnetism generating member.

Optionally, in the above arc striking structure, the magnetic generating piece includes two magnets symmetrically arranged along the breaking plane, and identical magnetic poles of the two magnets are oppositely arranged.

Optionally, in the above arc striking structure, a plane where the magnetic poles of the magnet are located is parallel to the breaking plane.

Optionally, in the arc striking structure, a plane where the magnetic poles of the magnet are located and the breaking surface have an included angle greater than 0 ° and less than 90 °.

Optionally, in the above arc striking structure, both the two magnets of the magnetic generating piece are permanent magnets or electromagnetic coils, or one of the two magnets of the magnetic generating piece is a permanent magnet and the other is an electromagnetic coil.

Optionally, in the above arc striking structure, the magnetism generating part is a magnet, and two ends of the magnet are symmetrically arranged along the breaking plane;

the plane of the magnetic pole of the magnet is perpendicular to the breaking plane.

Optionally, in the above arc striking structure, the magnetism generating member is a permanent magnet or an electromagnetic coil.

Optionally, in the above arc striking structure, a positioning portion for positioning the magnetic generating element is provided on the housing.

Optionally, in the above arc striking structure, the moving contact module has a gas generating portion that blows an arc from the first magnetic field region toward the second magnetic field region.

According to the arc striking structure provided by the application, the magnetic generating piece is arranged in the shell, the first magnetic field area and the second magnetic field area are generated on two sides of the parting surface through the magnetic generating piece, and the first magnetic field area is kept closer to the parting surface than the second magnetic field area, so that an arc generated between the moving contact and the fixed contact is acted by Lorentz force of the first magnetic field area. The first lorentz force F1 generated by the first magnetic field region can lead the electric arc to the second magnetic field region, and the second lorentz force F2 generated by the second magnetic field region pulls the electric arc pulled to the second magnetic field region by the first lorentz force F1 to the outer side of the moving contact module moving region.

Since the magnetic induction lines of the first magnetic field regions located at both sides of the breaking plane are identical in direction, when the current direction is determined, the electric arcs at the breaking plane are identical in direction to the first lorentz force F1 of the first magnetic field regions located at both sides. The direction of the current is related to the direction of the lorentz force, and if the direction of the current is opposite, the direction of the lorentz force is opposite. Thus, depending on the direction of the current, the first magnetic field regions on both sides of the dividing plane can jointly direct the arc to the second magnetic field region facing the first side of the dividing plane or to the second magnetic field region on the second side. When the current direction is the first direction, the first magnetic field region pulls the electric arc to the second magnetic field region positioned at the first side of the split section, and the second magnetic field region at the first side pulls the electric arc to the outer side of the moving contact module moving region. When the current direction is the second direction, the first magnetic field region pulls the electric arc to the second magnetic field region positioned on the second side of the split section, and the second magnetic field region on the second side is opposite to the second magnetic field region on the first side, so that when the current direction is changed from the first direction to the second direction, the second magnetic field region on the second side can pull the electric arc to the outer side of the moving region of the movable contact module.

A contact unit comprising an arcing structure, the arcing structure being an arcing structure as defined in any one of the preceding claims.

A rotary switch comprising a contact unit, the contact unit being a contact unit as described above.

The contact unit and the isolating switch provided by the application have all the technical effects of the arc striking structure because of the arc striking structure, and are not repeated herein.

Drawings

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

Fig. 1 is a schematic structural diagram of a rotary isolating switch according to an embodiment of the present application;

FIG. 2 is an exploded view of a contact unit according to an embodiment of the present application;

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

fig. 4 is a top view of a contact unit according to an embodiment of the present application;

FIG. 5 is a schematic view of a partial structure of a rotary disconnecting switch according to an embodiment of the application;

FIG. 6 is a magnetic field diagram of a dual magnet with N-pole facing inwards with current in a split section according to an embodiment of the present application;

FIG. 7 is a magnetic field diagram of a dual magnet S-pole facing inwards with current in a split section according to an embodiment of the present application;

FIG. 8 is a magnetic field diagram of a dual magnet with N-pole facing outwards with current split surface according to an embodiment of the present application;

FIG. 9 is a magnetic field diagram of a dual magnet S-pole facing outwards with a split current according to an embodiment of the present application;

FIG. 10 is a magnetic field diagram of a single magnet with N poles facing inward toward the center of rotation of a moving contact according to an embodiment of the present application;

FIG. 11 is a magnetic field diagram of a single magnet with S pole facing inward toward the center of rotation current of a moving contact according to an embodiment of the present application;

FIG. 12 is a magnetic field diagram of a single magnet with N pole facing outwards the current of the rotation center of the moving contact according to the embodiment of the present application;

FIG. 13 is a magnetic field diagram of a single magnet with S-pole facing outwards the current of the rotation center of the moving contact according to the embodiment of the present application;

FIG. 14 is a magnetic field diagram of a dual magnet tilt arrangement according to an embodiment of the present application;

fig. 15 is a schematic diagram of an arc exposed to lorentz forces in accordance with an embodiment of the present application.

The meaning of the individual reference numerals in fig. 1 to 15 is as follows:

100 is a shell, 200 is a rotary moving contact module, 300 is a fixed contact module, 400 is a magnetism generating piece, 500 is a translational moving contact module, 600 is a fixed contact module, and 700 is an electric arc;

101 is an exhaust passage, 102 is a double-magnet positioning part, 103 is a single-magnet positioning part, 201 is a movable contact, 202 is a split surface, 301 is a stationary contact, 401 is a first magnetic field region, and 402 is a second magnetic field region.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. 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.

As shown in fig. 2 and 3, an arc striking structure is disclosed in an embodiment of the present application, and the arc striking structure is used for a contact unit, where the contact unit includes a housing 100, and a fixed contact module and a moving contact module that are disposed on the housing 100.

The contact unit may be a contact unit of a rotary disconnecting switch as shown in fig. 1 to 4, and the housing 100 is provided with a stationary contact module 300 and a rotary moving contact module 200. The contact unit may also be a contact unit of a translational disconnecting switch as shown in fig. 5, and the housing 100 is provided with a stationary contact module 600 and a translational moving contact module 500. In order to facilitate understanding, the arc striking structure is described below by taking a rotary isolating switch as an example, and the translational isolating switch is also applicable to the arc striking structure disclosed in this embodiment.

The casing 100 is provided with a magnetic generating element 400, and the magnetic generating element 400 generates a first magnetic field region 401 and a second magnetic field region 402 on both sides of the breaking plane 202 (as shown in fig. 6). The parting plane 202 is a center plane of the moving direction of the moving contact module, as shown in fig. 4, and a rotary disconnecting switch is taken as an example, that is, the rotary moving contact module 200 can be realized by rotation. The movable contact 201 thereof is engaged with and separated from the stationary contact 301 of the stationary contact module 300 to thereby implement a switching action. The center plane of the reciprocating motion area of the movable contact 201 is the breaking plane 202. Generally, the movable contact 201 will contact with the upper and lower side surfaces of the stationary contact 301, and therefore the split surface 202 may also be understood as a middle plane of the two side surfaces where the stationary contact 301 engages with the movable contact 201. As shown in fig. 6-14, the magnetic induction lines of the first magnetic field regions 401 located at two sides of the split surface 202 are the same, for example, the magnetic induction lines of the first magnetic field regions 401 located at two sides of the split surface 202 shown in fig. 6, 8, 10, 12 and 14 are all directed to the moving contact center 203; the magnetic induction lines of the first magnetic field regions 401 located on both sides of the split surface 202 shown in fig. 7, 9, 11, and 13 are all directed away from the moving contact center 203.

The magnetic induction lines of the second magnetic field regions 402 located at both sides of the split surface 202 are opposite in direction. For example, the magnetic induction lines of the second magnetic field regions 402 located at both sides of the split surface 202 shown in fig. 6, 8, 10, 12, and 14 are all facing away from the split surface 202; the magnetic induction lines of the second magnetic field regions 402 located on both sides of the split surface 202 shown in fig. 7, 9, 11, and 13 are directed toward the split surface 202.

The first lorentz force F1 generated by the first magnetic field region 401 on the arc is directed toward the second magnetic field region 402 on the first side or the second side of the split surface 202. The second lorentz force F2 generated by the second magnetic field region 402 on the arc is directed to the outer side of the moving contact module moving region, and the first magnetic field region 401 is closer to the split surface 202 than the second magnetic field region 402.

Fig. 6-10 illustrate a solution in which the magnetically producing member 400 comprises two magnets symmetrically arranged along the split 202.

As shown in fig. 6, the magnetic induction lines of the first magnetic field region 401 are directed toward the moving contact center 203, and the magnetic induction lines of the second magnetic field regions 402 on both sides of the breaking surface 202 are facing away from the breaking surface 202, and the current direction is inward. For ease of understanding, the upper portion of the split 202 shown in fig. 6-14 is defined as a first side of the split 202, and the lower portion of the split 202 is defined as a second side of the split 202. Note that, the upper and lower portions of the split surface 202 shown in the drawing are not located at the upper and lower portions of the split surface 202 in all application scenarios, and are related to the installation positions of the isolating switches.

The arc at the parting plane 202 is subjected to a first lorentz force F1 of the first magnetic field region 401, the first lorentz force F1 being directed downwards, pulling the arc to the second side of the parting plane 202. After the arc is pulled to the second side of the breaking surface 202, the second magnetic field region 402 located at the second side of the breaking surface 202 generates a second lorentz force F2 on the arc, and the direction of the second lorentz force F2 faces the outside of the moving contact module moving region, thereby pulling the arc to the outside of the moving contact module moving region to break the arc.

As shown in fig. 8, the magnetic induction lines of the first magnetic field region 401 are directed to the moving contact center 203, and the magnetic induction lines of the second magnetic field regions 402 on both sides of the breaking surface 202 are facing away from the breaking surface 202, and the current direction is outward. The arc at the parting plane 202 is subjected to a first lorentz force F1 of the first magnetic field region 401, the first lorentz force F1 being directed upwards, pulling the arc to the first side of the parting plane 202. After the arc is pulled to the first side of the breaking surface 202, the second magnetic field region 402 located at the first side of the breaking surface 202 generates a second lorentz force F2 on the arc, and the direction of the second lorentz force F2 faces the outside of the moving contact module moving region, thereby pulling the arc to the outside of the moving contact module moving region to break the arc.

Fig. 6 and 8 illustrate embodiments in which the magnetic induction lines of the first magnetic field region 401 and the second magnetic field region 402 are identical in direction, except for the current direction. While the embodiment shown in fig. 6 has a first magnetic field region 401 pulling the arc to the second side of the breaking plane 202, the embodiment shown in fig. 8 has a first magnetic field region 401 pulling the arc to the first side of the breaking plane 202, but eventually both are pulled by a second magnetic field region 402 towards the outside of the moving contact module movement area. Therefore, when the magnetic induction lines of the first magnetic field region 401 point to the moving contact center 203 and the magnetic induction lines of the second magnetic field regions 402 at two sides of the breaking surface 202 are all opposite to the breaking surface 202, no matter the current direction is inward or outward, the electric arc can be elongated, no polarity requirement is required on the butt joint line, and the problem of switch burnout caused by reverse connection of the current direction can be avoided.

As shown in fig. 7, the magnetic induction lines of the first magnetic field region 401 face away from the center 203 of the moving contact, and the magnetic induction lines of the second magnetic field regions 402 on both sides of the dividing plane 202 are all directed toward the dividing plane 202, and the current direction is inward. The arc at the parting plane 202 is subjected to a first lorentz force F1 of the first magnetic field region 401, the first lorentz force F1 being directed upwards, pulling the arc to a first side of the parting plane 202. After the arc is pulled to the first side of the breaking surface 202, the second magnetic field region 402 located at the first side of the breaking surface 202 generates a second lorentz force F2 on the arc, and the direction of the second lorentz force F2 faces the outside of the moving contact module moving region, thereby pulling the arc to the outside of the moving contact module moving region to break the arc.

As shown in fig. 9, the magnetic induction lines of the first magnetic field region 401 face away from the center 203 of the moving contact, and the magnetic induction lines of the second magnetic field regions 402 on both sides of the dividing plane 202 are all directed to the dividing plane 202, and the current direction is outward. The arc at the parting plane 202 is subjected to a first lorentz force F1 of the first magnetic field region 401, the first lorentz force F1 being directed downwards, pulling the arc to a second side of the parting plane 202. After the arc is pulled to the second side of the breaking surface 202, the second magnetic field region 402 located at the second side of the breaking surface 202 generates a second lorentz force F2 on the arc, and the direction of the second lorentz force F2 faces the outside of the moving contact module moving region, thereby pulling the arc to the outside of the moving contact module moving region to break the arc.

Fig. 7 and 9 illustrate embodiments in which the magnetic induction lines of the first magnetic field region 401 and the second magnetic field region 402 are identical in direction, except for the current direction. While the embodiment shown in fig. 7 has a first magnetic field region 401 pulling the arc to a first side of the breaking surface 202, the embodiment shown in fig. 9 has a first magnetic field region 401 pulling the arc to a second side of the breaking surface 202, but eventually both are pulled by a second magnetic field region 402 towards the outside of the moving contact module movement area. Therefore, when the magnetic induction lines of the first magnetic field region 401 face away from the moving contact center 203 and the magnetic induction lines of the second magnetic field regions 402 on two sides of the breaking surface 202 are all directed to the breaking surface 202, no matter the current direction is inward or outward, the electric arc can be elongated, no polarity requirement is required on the butt joint line, and the problem of switch burnout caused by reverse connection of the current direction can be avoided.

Fig. 10-13 show a scheme that the magnetism generating part 400 is a magnet, two ends of the magnet are symmetrically arranged along the breaking plane 202, and a plane where magnetic poles of the magnet are located is perpendicular to the breaking plane 202.

As shown in fig. 10, the magnetic induction lines of the first magnetic field region 401 are directed toward the moving contact center 203, and the magnetic induction lines of the second magnetic field regions 402 on both sides of the breaking surface 202 are facing away from the breaking surface 202, and the current direction is inward. The arc at the parting plane 202 is subjected to a first lorentz force F1 of the first magnetic field region 401, the first lorentz force F1 being directed downwards, pulling the arc to the second side of the parting plane 202. After the arc is pulled to the second side of the breaking surface 202, the second magnetic field region 402 located at the second side of the breaking surface 202 generates a second lorentz force F2 on the arc, and the direction of the second lorentz force F2 faces the outside of the moving contact module moving region, thereby pulling the arc to the outside of the moving contact module moving region to break the arc.

As shown in fig. 12, the magnetic induction lines of the first magnetic field region 401 are directed toward the moving contact center 203, and the magnetic induction lines of the second magnetic field regions 402 on both sides of the breaking surface 202 are facing away from the breaking surface 202, and the current direction is outward. The arc at the parting plane 202 is subjected to a first lorentz force F1 of the first magnetic field region 401, the first lorentz force F1 being directed upwards, pulling the arc to the first side of the parting plane 202. After the arc is pulled to the first side of the breaking surface 202, the second magnetic field region 402 located at the first side of the breaking surface 202 generates a second lorentz force F2 on the arc, and the direction of the second lorentz force F2 faces the outside of the moving contact module moving region, thereby pulling the arc to the outside of the moving contact module moving region to break the arc.

Fig. 10 and 12 illustrate embodiments in which the magnetic induction lines of the first magnetic field region 401 and the second magnetic field region 402 are identical in direction, except for the current direction. While the embodiment shown in fig. 10 has a first magnetic field region 401 pulling the arc to the second side of the breaking plane 202, the embodiment shown in fig. 12 has a first magnetic field region 401 pulling the arc to the first side of the breaking plane 202, but eventually both are pulled by a second magnetic field region 402 towards the outside of the moving contact module movement region. Therefore, when the magnetic induction lines of the first magnetic field region 401 point to the moving contact center 203 and the magnetic induction lines of the second magnetic field regions 402 at two sides of the breaking surface 202 are all opposite to the breaking surface 202, no matter the current direction is inward or outward, the electric arc can be elongated, no polarity requirement is required on the butt joint line, and the problem of switch burnout caused by reverse connection of the current direction can be avoided.

As shown in fig. 11, the magnetic induction lines of the first magnetic field region 401 face away from the center 203 of the moving contact, and the magnetic induction lines of the second magnetic field regions 402 on both sides of the dividing plane 202 are all directed toward the dividing plane 202, and the current direction is inward. The arc at the parting plane 202 is subjected to a first lorentz force F1 of the first magnetic field region 401, the first lorentz force F1 being directed upwards, pulling the arc to a first side of the parting plane 202. After the arc is pulled to the first side of the breaking surface 202, the second magnetic field region 402 located at the first side of the breaking surface 202 generates a second lorentz force F2 on the arc, and the direction of the second lorentz force F2 faces the outside of the moving contact module moving region, thereby pulling the arc to the outside of the moving contact module moving region to break the arc.

As shown in fig. 13, the magnetic induction lines of the first magnetic field region 401 face away from the moving contact center 203, and the magnetic induction lines of the second magnetic field regions 402 on both sides of the dividing plane 202 are all directed to the dividing plane 202, and the current direction is outward. The arc at the parting plane 202 is subjected to a first lorentz force F1 of the first magnetic field region 401, the first lorentz force F1 being directed downwards, pulling the arc to a second side of the parting plane 202. After the arc is pulled to the second side of the breaking surface 202, the second magnetic field region 402 located at the second side of the breaking surface 202 generates a second lorentz force F2 on the arc, and the direction of the second lorentz force F2 faces the outside of the moving contact module moving region, thereby pulling the arc to the outside of the moving contact module moving region to break the arc.

Fig. 11 and 13 illustrate embodiments in which the magnetic induction lines of the first magnetic field region 401 and the second magnetic field region 402 are identical in direction, except for the current direction. While the embodiment shown in fig. 11 has a first magnetic field region 401 pulling the arc to a first side of the breaking surface 202, the embodiment shown in fig. 13 has a first magnetic field region 401 pulling the arc to a second side of the breaking surface 202, but eventually both are pulled by a second magnetic field region 402 to the outside of the moving contact module movement region. Therefore, when the magnetic induction lines of the first magnetic field region 401 face away from the moving contact center 203 and the magnetic induction lines of the second magnetic field regions 402 on two sides of the breaking surface 202 are all directed to the breaking surface 202, no matter the current direction is inward or outward, the electric arc can be elongated, no polarity requirement is required on the butt joint line, and the problem of switch burnout caused by reverse connection of the current direction can be avoided.

In summary, in the arc striking structure provided by the application, the magnetic generating member 400 is disposed in the housing 100, and the first magnetic field region 401 and the second magnetic field region 402 are generated on both sides of the split surface 202 by the magnetic generating member 400, and the first magnetic field region 401 is kept closer to the split surface 202 than the second magnetic field region 402, so that the arc generated between the moving contact and the static contact is acted by lorentz force of the first magnetic field region 401. The generated first lorentz force F1 of the first magnetic field region 401 may guide an arc to the second magnetic field region 402, and the second lorentz force F2 generated by the second magnetic field region 402 pulls the arc pulled to the second magnetic field region 402 by the first lorentz force F1 to the outside of the moving contact module movement region.

Since the magnetic induction lines of the first magnetic field regions 401 located on both sides of the dividing surface 202 are identical in direction, the electric arcs at the dividing surface 202 are subjected to the first lorentz force F1 of the first magnetic field regions 401 on both sides in the same direction when the current direction is determined. The direction of the current is related to the direction of the lorentz force, and if the direction of the current is opposite, the direction of the lorentz force is opposite. Thus, depending on the direction of the current, the first magnetic field regions 401 on both sides of the split plane 202 may together direct an arc to the second magnetic field regions 402 towards the first side of the split plane 202 or the second magnetic field regions 402 on the second side.

For example, when the current direction is in a first direction (one of inward and outward), the first magnetic field region 401 pulls the arc to the second magnetic field region 402 located on the first side of the split section 202, and the second magnetic field region 402 on the first side pulls the arc outside the moving contact module movement region. When the current direction is the second direction (the other of inward and outward), the first magnetic field region 401 pulls the arc to the second magnetic field region 402 located on the second side of the split surface 202, and the second magnetic field region 402 on the second side is opposite to the second magnetic field region 402 on the first side, so that when the current direction is changed from the first direction to the second direction, the second magnetic field region 402 on the second side can pull the arc to the outside of the moving area of the moving contact module.

In one embodiment of the present application, the first magnetic field regions 401 located at both sides of the dividing plane 202 are symmetrical along the dividing plane 202; and/or second magnetic field regions 402 located on both sides of parting plane 202 are symmetrical along parting plane 202. In particular, the magnetic generating piece 400 is symmetrically arranged along the breaking surface 202. The first magnetic field regions 401 on both sides of the dividing plane 202 are symmetrical along the dividing plane 202, and the first lorentz force F1 generated at the dividing plane 202 can be ensured to be maximum. The second magnetic field regions 402 located at two sides of the split surface 202 are symmetrical along the split surface 202, so that the equality of the second lorentz forces F2 at two sides of the split surface 202 can be ensured, and the situation that the second lorentz force F2 at one side is larger and the second lorentz force F2 at the other side is smaller is avoided.

In one embodiment of the present application, the direction of the first lorentz force F1 is perpendicular to the breaking surface 202; and/or the direction of the second lorentz force F2 is parallel to the breaking surface 202, and can be specifically obtained by adjusting the position relationship between the magnetic generating piece 400 and the breaking surface 202. The direction of the first lorentz force F1 is perpendicular to the breaking surface 202, so that the electric arc is pulled to the second magnetic field region 402 along the direction perpendicular to the breaking surface 202, and the electric arc can be ensured not to be tangential and oblique to the direction close to the moving region of the moving contact module when being pulled to the second magnetic field region 402, so that the electric arc is compressed; it is also ensured that the second lorentz force F2 is not applied by the arc being obliquely cut in a direction approaching the moving contact module movement region when the arc is not pulled in the direction of the second magnetic field region 402.

As shown in fig. 3 and 4, the magnetism generating member 400 is disposed outside the moving contact module movement sweeping area. The number of the fixed contact modules is two, each fixed contact module is provided with a fixed contact 301, each movable contact module is provided with two movable contacts 201, and when the movable contact module is in a first position, the movable contacts 201 at two ends of the movable contact module are respectively contacted with the fixed contacts 301 of the two fixed contact modules, so that the conduction of a circuit is realized; when the movable contact module is in the second position, the movable contacts 201 at two ends of the movable contact module are respectively separated from the fixed contacts 301 of the two fixed contact modules, so that the circuit is disconnected. Each movable contact 201 of the movable contact module is correspondingly provided with a magnetism generating piece 400, and the magnetism generating piece 400 is arranged outside a movement sweeping area of the movable contact 201 corresponding to the magnetism generating piece 400. In this embodiment, the magnetism generating member 400 is disposed outside the moving scanning area of the movable contact 201 corresponding to the magnetism generating member, so that the first magnetic field region 401 and the second magnetic field region 402 described above can be formed without affecting the normal switching operation of the movable contact 201.

As shown in fig. 4 and 15, when the moving contact module is a rotary moving contact module 200, the housing 100 is provided with an exhaust channel 101 for arc blowing, and the exhaust channel 101 is provided on the housing 100 as a conventional arc extinguishing structure of a disconnecting switch, generally the exhaust channel 101 is arranged on a path of a moving sweeping area of the moving contact 201, and when the moving contact 201 pulls an arc to a position where the exhaust channel 101 is located, the arc is pulled off along the exhaust channel 101 under the action of gas. The magnetism generating member 400 is disposed in a region between the stationary contact module corresponding thereto and the exhaust passage 101. It will be appreciated by those skilled in the art that the positions of first magnetic field region 401 and second magnetic field region 402 may be adjusted by the position of magnetic article 400. In the present embodiment, the magnetism generating member 400 may be disposed such that the first magnetic field region 401 and the second magnetic field region 402 are located in the region of the exhaust passage 101, and the arc 700 is pulled in the direction of the second magnetic field region 402 on the first side or the second side of the breaking surface 202 by the first lorentz force F1 of the first magnetic field region 401. The arc 700 is pulled away from the rotary moving contact module 200, i.e., by the exhaust passage 101, to the outside of the housing 100 by the second lorentz force F2 of the second magnetic field region 402.

As shown in fig. 5, when the movable contact module is a translational movable contact module 500, the magnetism generating member 400 is disposed in a region between the second position of the translational movable contact module 500 and the stationary contact module 600 corresponding to the magnetism generating member 400. The motion direction of the translational motion contact module 500 is taken as the X direction, and the arrangement direction of the two static contact modules 600 is taken as the Y direction; in the Y direction, the magnetism generating part 400 is located at the outer side of the movement area of the translational moving contact module 500, that is, in the view angle shown in fig. 5, the magnetism generating part 400 located at the upper side is located at the upper side of the movement area of the translational moving contact module 500; the magnetic generating element 400 located at the lower side is located at the lower side of the movement area of the translational moving contact module 500.

In the X-direction, the magnetism generating member 400 is located in a region between the first position and the second position of the translational movable contact module 500; that is, from the view point shown in fig. 5, the magnetism generating part 400 located at the upper side is located between the upper side fixed contact module and the second position of the movable contact at the upper end of the translational movable contact module 500; the magnetism generating member 400 located at the lower side is located between the lower static contact module 600 and the second position of the movable contact at the lower end of the translational movable contact module 500.

The magnetic generating piece 400 is arranged on one side of the fixed contact module 600, which is close to the second position of the translational moving contact module 500, so that an electric arc generated in the breaking process of the translational moving contact module 500 and the fixed contact module 600 can fall into the magnetic field ranges of the first magnetic field region 401 and the second magnetic field region 402 generated by the magnetic generating piece 400, and then a first lorentz force F1 and a second lorentz force F2 can be generated correspondingly and sequentially, and finally the electric arc is pulled to the outer side of the movement region of the translational moving contact module 500.

As shown in fig. 2 and 5, the magnetic generating member 400 may include two magnets symmetrically arranged along the dividing plane 202, and identical poles of the two magnets are arranged opposite to each other, and when an arrangement scheme of the two magnets is selected, identical poles of the two magnets must be arranged opposite to each other to generate the first magnetic field region 401 and the second magnetic field region 402 that meet the requirements. Fig. 6 and 7 show a scheme in which the two magnets are opposite in N pole and opposite in S pole when the current direction is inward. Fig. 8 and 9 show a scheme in which the two magnets are opposite in N pole and opposite in S pole when the current direction is outward.

Further, as shown in fig. 6-9, when the magnet is a regular-structure magnet, such as a cylindrical magnet, a prismatic magnet, or the like, the N-pole and S-pole of the magnet are two surfaces that are extremely opposite, as shown in fig. 6 and 8, and the surface of the N-pole of the two magnets faces the split surface 202, as shown in fig. 7 and 9, and the surface of the S-pole of the two magnets faces the split surface 202. In this embodiment, when the N pole and S pole of the magnet are opposite to each other, the plane where the magnetic pole of the magnet is located can be kept parallel to the dividing plane 202 as much as possible, so that the first magnetic field region 401 and the second magnetic field region 402 can be more conveniently called out. Of course, the plane where the magnetic poles of the magnet are located and the breaking plane 202 may have an included angle of more than 0 ° and less than 90 ° as shown in fig. 14, and the first magnetic field region 401 and the second magnetic field region 402 may be obtained as required.

The two magnets of the magnetism generating part 400 may be permanent magnets or electromagnetic coils, or one may be permanent magnets and the other may be electromagnetic coils. The specific form of the magnetic field generated by the magnetic generating member 400 is not limited in this embodiment, as long as the corresponding first magnetic field region 401 and second magnetic field region 402 can be generated, and the type of the magnet material is not limited.

When the magnetism generating part 400 adopts a magnetism generating scheme that two magnets are oppositely arranged, a foolproof structure can be arranged on the magnetism generating part 400 and the shell 100, for example, the magnetism generating part 400 is a cuboid structure with trimming edges or a circular structure with two asymmetric trimming edges, and the shell 100 is provided with a positioning part corresponding to the trimming edges.

As shown in fig. 10 to 13, the magnetism generating part 400 is a magnet, and two ends of the magnet are symmetrically arranged along the breaking plane 202, and a plane where magnetic poles of the magnet are located is perpendicular to the breaking plane 202. When a magnet arrangement is selected, the plane of the poles of the magnet must be perpendicular to the split plane 202 to produce the desired first magnetic field region 401 and second magnetic field region 402. Fig. 10 and 11 show the arrangement in which the magnet N faces the moving contact module moving area and the magnet S faces the moving contact module moving area when the current direction is inward. Fig. 12 and 13 show the arrangement in which the magnet N faces the moving contact module moving area and the magnet S faces the moving contact module moving area when the current direction is outward.

The magnet of the magnetic generating element 400 may be a permanent magnet or an electromagnetic coil, and the specific form of the magnetic field generated by the magnetic generating element 400 is not limited in this embodiment, so long as the corresponding first magnetic field region 401 and second magnetic field region 402 can be generated, and the type of magnet material is not limited.

In order to facilitate the installation and positioning of the magnetic producing member 400 in the housing 100, the housing 100 is provided with a positioning portion for positioning the magnetic producing member 400, so that the magnetic producing member 400 can be rapidly installed, and the first magnetic field region 401 and the second magnetic field region 402 meeting the requirements can be generated after the installation. As shown in fig. 4 and 15, the housing 100 may include two magnets for the magnetic generating element 400, and the magnetic generating element 400 includes a single magnet, which are provided with corresponding positioning portions. Such as the double magnet positioning part 102 and the single magnet positioning part 103, the user can select to install the double magnet or the single magnet according to the requirement. Of course, only one of the double magnet positioning portion 102 and the single magnet positioning portion 103 may be provided in the case 100.

In one embodiment of the present application, the moving contact module may have a gas generating portion that blows an arc from the first magnetic field region 401 toward the second magnetic field region 402, and the gas generating material of the gas generating portion may be POM (polyoxymethylene), PA (polyhexamethylene adipamide) 66 (i.e., nylon 66), PA (polyhexamethylene adipamide) 46 (i.e., nylon 46), and the like.

The embodiment of the application also discloses a contact unit which comprises an arc striking structure, wherein the arc striking structure is the arc striking structure disclosed in the embodiment, so that the contact unit has all the technical effects of the arc striking structure and is not repeated herein.

As shown in fig. 1, the embodiment of the present application further discloses an isolating switch, which includes a contact unit, where the contact unit is a contact unit disclosed in the above embodiment, so that all the technical effects of the contact unit are achieved, and the details are not repeated herein.

It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.

As used in the specification and in the claims, the terms "a," "an," "the," and/or "the" are not specific to a singular, but may include a plurality, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus. The inclusion of an element defined by the phrase "comprising one … …" does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises an element.

Wherein, in the description of the embodiments of the present application, unless otherwise indicated, "/" means or, for example, a/B may represent a or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, in the description of the embodiments of the present application, "plurality" means two or more than two.

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the application. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.

Claims

1. An arc striking structure is used for a contact unit, the contact unit comprises a shell (100), a fixed contact module and a moving contact module, wherein the fixed contact module and the moving contact module are arranged on the shell (100), and the arc striking structure is characterized by further comprising a magnetic generating piece (400) arranged on the shell (100), a first magnetic field area (401) and a second magnetic field area (402) are generated on two sides of a breaking surface of the magnetic generating piece (400), and the breaking surface (202) is a central surface in the moving direction of the moving contact module;

the magnetic induction lines of the first magnetic field regions (401) positioned at two sides of the dividing plane (202) are in the same direction, and the magnetic induction lines of the second magnetic field regions (402) positioned at two sides of the dividing plane (202) are opposite in direction;

a second magnetic field region (402) of the first magnetic field region (401) facing the first side or the second side of the breaking surface (202) in a direction of a first lorentz force F1 generated by an arc;

the direction of a second Lorentz force F2 generated by the second magnetic field region (402) on the electric arc faces to the outer side of the moving contact module moving region;

the first magnetic field region (401) is closer to the breaking plane (202) than the second magnetic field region (402).

2. The arc striking structure according to claim 1, characterized in that the first magnetic field regions (401) located on both sides of the breaking plane (202) are symmetrical along the breaking plane (202); and/or

Second magnetic field regions (402) located on both sides of the dividing plane (202) are symmetrical along the dividing plane (202).

3. The striking structure according to claim 1, characterized in that the direction of the first lorentz force F1 is perpendicular to the breaking plane (202); and/or

The direction of the second lorentz force F2 is parallel to the breaking surface (202).

4. The arc striking structure according to claim 1, wherein the magnetic generating element (400) is arranged outside the moving contact module movement sweep area.

5. The arc striking structure according to claim 4, wherein the number of the fixed contact modules is two, each fixed contact module is provided with a fixed contact, each movable contact module is provided with two movable contacts, and when the movable contact module is in the first position, the two movable contacts of the movable contact module are respectively contacted with the fixed contacts of the two fixed contact modules, so that the conduction of a circuit is realized; when the movable contact module is positioned at the second position, the two movable contacts of the movable contact module are separated from the fixed contacts of the two fixed contact modules respectively, so that the disconnection of a circuit is realized;

each movable contact of the movable contact module is correspondingly provided with the magnetic generating piece (400);

the magnetic generating piece (400) is arranged outside the moving contact movement sweeping area corresponding to the magnetic generating piece.

6. The arc striking structure according to claim 5, characterized in that the moving contact module is a rotary moving contact module (200), the housing (100) is provided with an exhaust channel (101) for arc striking, and the magnetism generating member (400) is arranged in a region between the stationary contact module and the exhaust channel (101) corresponding thereto.

7. The arc striking structure according to claim 5, characterized in that the moving contact module is a translational moving contact module (500), and the magnetism generating member (400) is arranged in a region between the second position of the translational moving contact module (500) and the stationary contact module corresponding to the magnetism generating member (400).

8. The arc striking structure according to any one of claims 1 to 7, wherein said magnetism generating member (400) comprises two magnets symmetrically arranged along said breaking plane (202), and identical poles of two of said magnets are arranged opposite to each other.

9. The arc striking structure according to claim 8, characterized in that the plane of the poles of the magnet is parallel to the breaking plane (202).

10. The arc striking structure according to claim 8, characterized in that the plane in which the poles of the magnet lie has an angle with the breaking plane (202) of more than 0 ° and less than 90 °.

11. The arc striking structure according to claim 8, wherein both magnets of the magnetic generating member (400) are permanent magnets or electromagnetic coils, or one of the two magnets of the magnetic generating member (400) is a permanent magnet and the other is an electromagnetic coil.

12. The arc striking structure according to any one of claims 1 to 7, characterized in that said magnetism generating member (400) is a magnet, and both ends of said magnet are symmetrically arranged along said dividing plane (202);

the plane of the magnetic pole of the magnet is perpendicular to the breaking plane (202).

13. The arc striking structure according to claim 12, wherein the magnetic generating member (400) is a permanent magnet or an electromagnetic coil.

14. The arc striking structure according to any one of claims 1 to 7, wherein a positioning portion for positioning the magnetism generating member (400) is provided on the housing (100).

15. The arc striking structure according to any one of claims 1 to 7, wherein the moving contact module has a gas generating portion that blows an arc from the first magnetic field region (401) to the second magnetic field region (402).

16. A contact unit comprising an arcing structure, characterized in that the arcing structure is an arcing structure according to any of claims 1-15.

17. A disconnector comprising a contact unit, characterized in that the contact unit is a contact unit according to claim 16.