CN115083842A - Contactor arc extinguishing system and contactor - Google Patents

Abstract

The application provides a contact arc extinguishing system and contactor of contactor, contactor include the drive axis, and contact arc extinguishing system includes two static contacts, arc extinguishing subassembly and moving contact. The arc extinguishing component comprises a first arc extinguishing chamber and a second arc extinguishing chamber which are oppositely arranged along a first direction. The moving contact is located between first explosion chamber and the second explosion chamber, and the moving contact can be separately contacted with two static contacts and can produce electric arc when separating, and the moving contact includes contact body and two extensions, and the contact body is connected with the drive axis, and one of them extension is extended by the contact body towards first explosion chamber, and another extension is extended by the contact body towards the second explosion chamber. The projection part of the extension part along the first direction covers the corresponding arc extinguishing component, and the part of the at least one extension part along the projection part of the first direction, which covers the corresponding arc extinguishing component, is separably contacted with the fixed contact. The application provides a contact arc extinguishing system can improve the arc extinguishing effect.

Description

Contactor and arc extinguishing system thereof

Technical Field

The application relates to the technical field of contactors, in particular to a contact arc extinguishing system of a contactor and the contactor.

Background

The contactor is an electric control element, is generally used for connecting and disconnecting a power battery system in the field of new energy application, for example, a high-voltage direct-current contactor is usually adopted by an electric vehicle, and a high-voltage battery system can be disconnected in case of an accident.

The arc is a discharge phenomenon generated by gas between contacts under the action of a strong electric field. When the circuit is opened in the atmosphere, if the power supply voltage exceeds 12V-20V, the opened current exceeds 0.25A-1A, an electric arc is generated in the gap of the contact, the service life of the contactor is shortened due to the electric arc, the reliability of the operation is reduced, and even accidents can be caused.

Disclosure of Invention

The embodiment of the application provides a contact arc extinguishing system and contactor of contactor, and this contact arc extinguishing system can improve the arc extinguishing effect.

In a first aspect, an embodiment of the present application provides a contact arc extinguishing system of a contactor, where the contactor includes a driving middle shaft, and the contact arc extinguishing system includes two stationary contacts, an arc extinguishing assembly, and a moving contact. The arc extinguishing component comprises a first arc extinguishing chamber and a second arc extinguishing chamber which are oppositely arranged along a first direction. The moving contact is located between first explosion chamber and the second explosion chamber, and the moving contact can be separately contacted with two static contacts and can produce electric arc when separating, and the moving contact includes contact body and two extensions, and the contact body is connected with the drive axis, and one of them extension is extended by the contact body towards first explosion chamber, and another extension is extended by the contact body towards the second explosion chamber. The projection part of the extension part along the first direction covers the corresponding arc extinguishing component, and the part of the at least one extension part along the projection part of the first direction, which covers the corresponding arc extinguishing component, is separably contacted with the fixed contact.

In some embodiments, the projection of the extension portion along the second direction covers the corresponding arc extinguishing component, the portion of the at least one extension portion along the projection of the second direction covering the corresponding arc extinguishing component is detachably contacted with the fixed contact, and the second direction is perpendicular to the first direction.

In some embodiments, the two extending portions are in one-to-one correspondence with and in separable contact with the two stationary contacts.

In some embodiments, the extending portion includes a first surface facing the fixed contact and a protrusion protruding from the first surface, and the extending portion is detachably contacted with the fixed contact through the protrusion.

In some embodiments, the contact body comprises a second surface facing the stationary contact, the first surface and the second surface being flush.

In some embodiments, the cross-section of the protrusion in the direction of projection is circular.

In some embodiments, the contact body comprises a first end part and a second end part which are oppositely arranged along the second direction, and the two extending parts are connected with the first end part and the second end part in a one-to-one correspondence manner; the included angle between the extension part and the second direction is more than or equal to 30 degrees and less than or equal to 80 degrees, and the second direction is vertical to the first direction.

In some embodiments, the arc quenching device further comprises a cooling ring, wherein the cooling ring is an annular structural body with a hollow part, the arc quenching assembly is arranged in the hollow part, and the cooling ring surrounds at least part of the moving path of the movable contact to cool the arc.

In some embodiments, the cooling ring comprises an inner surface forming a hollow and a cooling portion, the cooling portion being convexly arranged with respect to the inner surface and being arranged in a region of the cooling ring adjacent to at least one of the two extensions, the cooling ring cooling the arc via the cooling portion.

In some embodiments, among the adjacent cooling portions and the extension portions, a projection of the cooling portion on the first plane along the arrangement direction of the two extension portions at least partially overlaps a projection of the movement path of the extension portion on the first plane along the arrangement direction of the two extension portions.

In a second aspect, the present application further provides a contactor including the contact arc extinguishing system.

The moving contact of the contact arc extinguishing system provided by the embodiment of the application comprises a contact body and two extending portions, the two extending portions are not only closer to a first arc extinguish chamber and a second arc extinguish chamber corresponding to the contact body, the extending portions cover corresponding arc extinguish components along the projection portions of the first direction, and the extending portions, corresponding to the arc extinguish components, of the projecting portions are separably contacted with a fixed contact, so that electric arcs generated when the fixed contact is separated from the extending portions are not only closer to the first arc extinguish chamber and/or the second arc extinguish chamber, but also are opposite to the first arc extinguish chamber and/or the second arc extinguish chamber in the first direction, the electric arcs easily enter the first arc extinguish chamber and/or the second arc extinguish chamber, the walking path of the electric arcs is obviously shortened, the arc extinguishing efficiency is accelerated, and the arc extinguishing effect is improved.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present application will be described below by referring to the accompanying drawings.

FIG. 1 is a cross-sectional view of a contactor according to an embodiment of the present application;

FIG. 2 is another cross-sectional view of a contactor according to an embodiment of the present application;

FIG. 3 is a schematic view of a portion of a contactor according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a contact arc extinguishing system according to an embodiment of the application;

fig. 5 is a schematic structural diagram of a movable contact in the arc extinguishing system of the contact shown in fig. 4;

fig. 6 is a schematic diagram of a structure of a grid of a first arc chute of the contact arc extinguishing system shown in fig. 4;

fig. 7 is a schematic diagram of a cooling ring of the arc quenching system of fig. 4;

fig. 8 is a schematic diagram illustrating a distribution of a magnetic field generated by a transfer device of a contact quenching system according to an embodiment of the present disclosure.

Reference numerals:

1. a contact system;

11. static contact; 12. a moving contact; 121. a contact body; 122. an extension portion; 123. a first surface; 124. a convex portion; 125. a second surface; 126. a first end portion; 127. a second end portion;

2. an arc extinguishing assembly;

21. a first arc-extinguishing chamber; 22. a second arc extinguishing chamber; 23. a grid sheet; 231. a second recess; 232. a groove;

3. an electromagnetic system;

31. a drive central shaft; 32. a stationary iron core; 33. a movable iron core; 34. a coil; 35. a metal cup; 36. a yoke;

4. a housing;

5. a cooling ring;

51. a hollow part; 52. an inner surface; 53. a cooling section;

6. a transfer device;

61. a first permanent magnet; 62. a second permanent magnet;

x, a first direction; y, second direction.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The directional terms used in the following description are intended to refer to directions shown in the drawings, and are not intended to limit the specific structure of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

Fig. 1 is a sectional view of a contactor according to an embodiment of the present application, fig. 2 is another sectional view of a contactor according to an embodiment of the present application, and fig. 3 is a partial structural view of a contactor according to an embodiment of the present application.

Referring to fig. 1 to 3, the contactor includes a housing 4, and an electromagnetic system 3, an arc extinguishing assembly 2 and a contact system 1 located in the housing 4, where the electromagnetic system 3 includes a driving central shaft 31, a stationary core 32, a movable core 33, a coil 34, a metal cup 35 and a yoke 36. The contact system 1 includes a fixed contact 11 and a movable contact 12, the movable contact 12 is connected to the driving central shaft 31, and the fixed contact 11 is located on two sides of the driving central shaft 31 and separably contacts with the movable contact 12. Optionally, the number of the fixed contacts 11 is two, and the two fixed contacts 11 are oppositely disposed on two sides of the driving center shaft 31, and each of the two fixed contacts 11 can be detachably contacted with the movable contact 12. The arc extinguishing components 2 are arranged on two sides of the moving contact 12 and are used for extinguishing electric arcs.

The exterior of the electromagnetic system 3 is completely covered by a metal cup 35, the metal cup 35 mainly plays a role of a magnetic yoke, and the large-area metal outer surface of the metal cup assists in arc cooling. The metal cup 35 is made of a magnetically conductive metal material, such as electrically pure iron. The driving middle shaft 31 is made of an insulating material, so that the movable contact 12 is electrically isolated from the movable iron core 33.

When the coil 34 of the contactor is energized, the current in the coil 34 generates a magnetic field, and the magnetic field causes the static iron core 32 to generate an electromagnetic attraction force to attract the movable iron core 33, so that the movable contact 12 of the contactor acts simultaneously with the magnetic field, and further the movable contact 12 and the static contact 11 are closed. When the coil of the contactor is powered off, the electromagnetic attraction disappears, and the movable contact 12 is disconnected with the fixed contact 11. However, when the coil 34 is de-energized, the output loop has a high voltage and a large current, so that an arc is generated between the moving contact 12 and the stationary contact 11, and the arc can be cut by the arc extinguishing assembly 2 and then extinguished.

However, the generation of the arc delays the opening and closing of the circuit, and even the moving contact 12 and the static contact 11 are burnt by the high energy of the arc, so that the moving contact 12 and the static contact 11 are fused, and in a serious case, the danger of fire, explosion and the like can occur.

In view of this, the embodiment of the present application provides a contact arc extinguishing system of a contactor, which is used for rapidly extinguishing an arc between contacts when a circuit is opened, so as to improve reliability of the contactor.

Fig. 4 is a schematic structural diagram of a contact arc extinguishing system according to an embodiment of the present application, and fig. 5 is a schematic structural diagram of a movable contact in the contact arc extinguishing system shown in fig. 4.

Referring to fig. 4 and 5, an embodiment of the present application provides a contact arc extinguishing system of a contactor, where the contactor includes a driving middle shaft 31, the contact arc extinguishing system includes two fixed contacts 11, a movable contact 12, and an arc extinguishing assembly 2, and the arc extinguishing assembly 2 includes a first arc extinguishing chamber 21 and a second arc extinguishing chamber 22 that are oppositely disposed along a first direction X. The movable contact 12 is located between the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22, and the movable contact 12 is in separable contact with the two fixed contacts 11 and is capable of generating an electric arc when separated. The movable contact 12 includes a contact body 121 and two extension portions 122, the contact body 121 is connected with the driving middle shaft 31, one of the extension portions 122 extends from the contact body 121 toward the first arc extinguish chamber 21, and the other extension portion 122 extends from the contact body 121 toward the second arc extinguish chamber 22. The projection of the extension portion 122 along the first direction X covers the corresponding arc extinguishing component 2, and the portion of at least one extension portion 122 along the first direction X covering the corresponding arc extinguishing component 2 is separably contacted with the stationary contact 11.

It should be noted that the separable contact means that the two can be in a contact state or in a separated state.

It should be noted that, one of the extending portions 122 extending toward the first arc-extinguishing chamber 21 means that, one of the extending portions 122 extending toward the position where the first arc-extinguishing chamber 21 is located, points toward the corresponding first arc-extinguishing chamber 21; the further extension 122 extending towards the second arc extinguishing chamber 22 means that the further extension 122 extends towards the location where the second arc extinguishing chamber 22 is located, pointing towards the corresponding second arc extinguishing chamber 22.

The extension portions 122 and the corresponding arc-extinguishing components 2 in the embodiment of the present application mean that one of the extension portions 122 and the adjacent first arc-extinguishing chamber 21 and the other extension portion 122 and the adjacent second arc-extinguishing chamber 22.

The projection of the extension portion 122 along the first direction X covers the corresponding arc extinguishing assembly 2, that is, in the first direction X, the projection of the extension portion 122 along the first direction X on the first arc extinguishing chamber 21 covers a part of the first arc extinguishing chamber 21 in the extension portion 122 and the first arc extinguishing chamber 21 corresponding thereto; in the second arc-extinguishing chamber 22 and the extension 122 corresponding thereto, the projection of the extension 122 in the first direction X on the second arc-extinguishing chamber 22 covers a portion of the second arc-extinguishing chamber 22.

An electric arc generated between one of the two fixed contacts 11 and the movable contact 12 enters the first arc extinguishing chamber 21, and an electric arc generated between the other fixed contact 11 and the movable contact 12 enters the second arc extinguishing chamber 22.

The movable contact 12 of the contact arc extinguishing system provided by the embodiment of the present application includes a contact body 121 and two extension portions 122, the two extension portions 122 are not only closer to the corresponding first arc-extinguishing chamber 21 and second arc-extinguishing chamber 22 relative to the contact body 121, and the projection of the extension 122 along the first direction X partially covers the corresponding arc extinguishing assembly 2, and the extension part 122 projected to cover the corresponding arc extinguishing assembly 2 is separably contacted with the fixed contact 11, therefore, the arc generated when the fixed contact 11 is separated from the extension part 122 is not only relatively close to the first arc extinguishing chamber 21 and/or the second arc extinguishing chamber 22, and opposite to the first arc chute 21 and/or the second arc chute 22 in the first direction X, the electric arc is very liable to enter the first arc chute 21 and/or the second arc chute 22, the walking path of the electric arc is obviously shortened, so that the arc extinguishing efficiency is accelerated, and the arc extinguishing effect is improved.

Optionally, the first direction X is perpendicular to the moving direction of the movable contact 12.

Alternatively, the contact body 121 has a rectangular cross section perpendicular to the moving direction of the movable contact 12.

Optionally, the portions of the two extending portions 122, which are projected along the first direction X and cover the corresponding arc extinguishing assemblies 2, are in one-to-one correspondence with the two stationary contacts 11 and are in separable contact.

In some embodiments, a projection of the extension portion 122 along the second direction Y covers the corresponding arc-extinguishing component 2, and a portion of the at least one extension portion 122 along the second direction Y covers the corresponding arc-extinguishing component 2 and is detachably contacted with the stationary contact 11, and the second direction Y is perpendicular to the first direction X. Alternatively, the second direction Y is perpendicular to the moving direction of the movable contacts 12.

In the embodiment of the present application, the projection of the extension portion 122 along the second direction Y covers the corresponding arc extinguishing assembly 2, that is, in the second direction Y, the projection of the extension portion 122 along the second direction Y on the first arc extinguishing chamber 21 covers part of the first arc extinguishing chamber 21 in the extension portion 122 and the first arc extinguishing chamber 21 corresponding to the extension portion; in the second arc-extinguishing chamber 22 and the extension 122 corresponding thereto, the projection of the extension 122 in the second direction Y on the second arc-extinguishing chamber 22 covers a portion of the second arc-extinguishing chamber 22.

Therefore, the extending portion 122 is opposite to the corresponding arc extinguishing component 2 in the first direction X and opposite to the corresponding arc extinguishing component 2 in the second direction Y, and the first direction X and the second direction Y are perpendicular to each other, so that the arc extinguishing component 2 is in a half-surrounded state with respect to the corresponding extending portion 122, the distance between the extending portion 122 and the arc extinguishing component 2 is extremely short, and the traveling path of the arc is extremely short, thereby greatly accelerating the arc extinguishing efficiency and remarkably improving the arc extinguishing effect.

Optionally, the parts of the two extending portions 122 that cover the corresponding arc extinguishing assemblies 2 in the projection along the second direction Y correspond to the two stationary contacts 11 one by one and are in separable contact.

In some alternative embodiments, the two extending portions 122 are in one-to-one correspondence with the two fixed contacts 11 and are in separable contact.

The two extending portions 122 are separably contacted with the fixed contact 11 on the corresponding side, so that the electric arcs on both sides of the movable contact 12 can enter the arc extinguishing assembly 2 relatively quickly, and the electric arcs on both sides do not have a relatively large arc extinguishing time difference to cause delayed opening of a circuit, thereby improving the arc extinguishing effect of the contact arc extinguishing system.

The two extending portions 122 of the embodiment of the present application may have the same shape or size, or may have different shapes or sizes, which is not limited herein.

In some alternative embodiments, the extension portion 122 includes a first surface 123 facing the fixed contact 11 and a protrusion 124 protruding from the first surface 123, and the extension portion 122 is detachably contacted with the fixed contact 11 through the protrusion 124.

The projection of the convex portion 124 along the first direction X covers the corresponding arc extinguishing component 2, and the projection of the convex portion 124 along the first direction X covers the portion of the corresponding arc extinguishing component 2 and the fixed contact 11 are separably contacted.

The shape of the convex portion 124 is not limited in the embodiment of the present application, and optionally, the cross-sectional shape of the convex portion 124 in the protruding direction is circular. Of course, the cross-sectional shape of the protrusion 124 in the protruding direction may also be an ellipse or other irregular shape, and the application is not limited thereto.

By arranging the convex part 124 on the first surface 123 and utilizing the separable contact between the convex part 124 and the static contact 11, the moving path of the moving contact 12 can be reduced, the time from the generation of an arc to the entering of the arc extinguishing assembly 2 can be shortened, and the arc extinguishing efficiency can be accelerated. In addition, the movable contact 12 can be in close contact with the stationary contact 11 through the protrusion 124, thereby improving the reliability of the contact between the movable contact 12 and the stationary contact 11.

The two protrusions 124 in the embodiment of the present application may be the same or different in shape, and the present application does not limit this.

Optionally, a projection of the protrusion 124 along the second direction Y covers the corresponding arc extinguishing component 2, and a portion of the protrusion 124 along the second direction Y covering the corresponding arc extinguishing component 2 is separably contacted with the stationary contact 11.

With continued reference to fig. 5, in some alternative embodiments, the contact body 121 includes a second surface 125 facing the stationary contact 11, and the first surface 123 and the second surface 125 are flush.

The first surface 123 and the second surface 125 are flush, i.e., the contact body 121 and the extension portion 122 are flush, which facilitates the fabrication of the extension portion 122.

In some embodiments, the contact body 121 includes a first end 126 and a second end 127 oppositely disposed along the second direction Y, and the two extending portions 122 are connected to the first end 126 and the second end 127 in a one-to-one correspondence; the included angle between the extension part 122 and the second direction Y is more than or equal to 30 degrees and less than or equal to 80 degrees, wherein the second direction Y is perpendicular to the first direction X. Further optionally, θ is in the range of 50 ° ≦ θ ≦ 70 °.

The included angle is set to be 30 degrees to 80 degrees, the arc striking angle of the extension part 122 and the direction of the Lorentz force generated by the magnetic field point to the corresponding arc extinguishing assembly 2, and the arc guiding effect of the extension part 122 is better. By setting the angle to 50 ° -70 °, the extension 122 is able to direct the arc deep into the first 21 and second 22 arc extinguishing chambers, making full contact with the first 21 and second 22 arc extinguishing chambers, and being cut faster.

Optionally, the value of θ is 55 °, 60 °, 65 °.

Fig. 6 is a schematic diagram of a structure of a grid of a first arc chute in the contact arc extinguishing system shown in fig. 4.

Referring to fig. 6, in some alternative embodiments, the first arc extinguish chamber 21 includes a plurality of grid plates 23 stacked one on another and an arc striking plate located at one end of the plurality of grid plates 23, where the arc striking plate and the grid plates 23 are stacked one on another and used for transferring the arc root of the static contact 11 to itself. The arc striking piece is formed with first concave part with the one end of static contact 11 complex, and first concave part sets up with the periphery interval of static contact 11, and the concave-convex cooperation of the two to introduce the electric arc into itself.

The gate 23 includes two opposite sides along the second direction Y, one of which is formed with a second recess 231. The extension portion 122 and the second recess 231 can be engaged in a concave-convex manner and disposed at an interval to introduce an arc into the second recess 231.

Further alternatively, the second recess 231 is recessed inwardly to form a groove 232 for elongating the arc.

Alternatively, the grid 23 may be made of cold-rolled steel sheet, copper sheet, Nomex profile, ceramic, or the like.

The second arc chute 22 is similar in structure to the first arc chute 21 and will not be described in detail herein.

Fig. 7 is a schematic diagram of a cooling ring in the arc quenching system of fig. 4.

Referring to fig. 7, in some embodiments, the contact arc extinguishing system further includes a cooling ring 5, the cooling ring 5 is a ring-shaped structural body having a hollow portion 51, the arc extinguishing member 2 is disposed in the hollow portion 51, and the cooling ring 5 surrounds at least a portion of a moving path of the movable contact 12 to cool the arc.

The cooling ring 5 surrounds at least part of the motion path of the movable contact 12, that is, the cooling ring 5 surrounds the outer periphery of the motion path of the movable contact 12, and at least part of the motion path of the movable contact 12 is surrounded in the cooling ring 5.

The movement path of the movable contact 12 in the embodiment of the present application refers to the movement path of the entire movable contact 12, and does not refer to the movement path of a certain point therein. That is, the motion path of the moving contact 12 includes a first position where the moving contact 12 is in contact with the fixed contact 11 and a second position where the moving contact 12 is farthest from the fixed contact 11, and the space through which the moving contact 12 passes from the first position to the second position is the motion path of the moving contact 12.

Alternatively, the length direction, i.e. the axial direction, of the cooling ring 5 is parallel to the movement direction of the movable contacts 12.

The arc extinguishing unit 2 may be provided in the hollow portion 51, and may be entirely located in the hollow portion 51 or partially located in the hollow portion 51.

Optionally, the cooling ring 5 is a ring-shaped structure. Further, the cooling ring 5 is a concentric annular structure. The drive bottom bracket 31 is located at the axis of the cooling ring 5.

Of course, the cooling ring 5 may be another ring structure, such as an elliptical ring structure, and the present application is not limited thereto.

In some alternative embodiments, the cooling ring 5 is made of a ceramic material. Of course, other materials with cooling capability and insulation can be used.

The hollow portion 51 of the cooling ring 5 is a hollow space surrounded by the annular structure.

Arc extinguishing subassembly 2 sets up in the well kenozooecium 51 of cooling ring 5, cooling ring 5 surrounds at least partial motion path of moving contact 12, the partial electric arc and partial high-temperature gas that produce between static contact 11 and the moving contact 12 get into arc extinguishing subassembly 2 via cooling ring 5, the electric arc and the high-temperature gas of contact cooling ring 5 are fully cooled off by cooling ring 5, then get into first explosion chamber 21 and second explosion chamber 22, first explosion chamber 21 and second explosion chamber 22 are the multistage short arc with electric arc cutting, grid piece and cooling ring 5 play the effect of strengthening cooling and surface recombination to short arc and high-temperature gas again, make high-temperature gas cool off fast, electric arc disappears rapidly, the breaking capacity of contact arc extinguishing system has been improved.

In some embodiments, the cooling ring 5 comprises an inner surface 52 forming the hollow 51 and a cooling portion 53, the cooling portion 53 being arranged convexly with respect to the inner surface 52 and in a region of the cooling ring 5 adjacent to at least one of the two extensions 122, the cooling ring 5 cooling the arc by means of the cooling portion 53.

Note that the region of the cooling ring 5 adjacent to the extension portion 122 refers to a region of the cooling ring 5 closest to the extension portion 122.

Optionally, the number of the cooling portions 53 is two, and two cooling portions 53 correspond to two extending portions 122 one to one.

The extension part 122 is a position where an arc is generated, and the cooling part 53 is adjacent to the extension part 122, so that the cooling part 53 is closer to the arc than the inner surface 52, and the arc which cannot partially reach the inner surface 52 can be cooled, so that the contact area with the arc is increased, and the cooling effect is improved; and the closer distance from the extension 122 enables the arc to be cooled more quickly, increasing the cooling rate.

In some embodiments, among the adjacent cooling portions 53 and extension portions 122, a projection of the cooling portion 53 on the first plane along the arrangement direction of the two extension portions 122 at least partially overlaps a projection of the movement path of the extension portion 122 on the first plane along the arrangement direction of the two extension portions 122.

The movement path of the extension portion 122 in the embodiment of the present application refers to the movement path of the entire extension portion 122, and does not refer to the movement path of a certain point, that is, the space passed by the extension portion 122 is the movement path of the extension portion 122.

The electric arc is generated between the static contact 11 and the moving contact 12, and a rear part of the electric arc enters the first arc extinguish chamber 21 and the second arc extinguish chamber 22 after passing through the cooling ring 5, so that the extension length of the cooling part 53 to one side of the arc extinguish component 2 is increased, the contact area of the part of the electric arc and the cooling part 53 in the motion process is increased, and the cooling effect of the cooling ring 5 is further improved.

In some alternative embodiments, the cooling portion 53 is a plurality of protrusions 531 spaced apart from the inner surface 52.

The shape of the protrusion 531 is not limited in the embodiment of the present application, and may be a long strip, a block, an irregular shape, or the like.

The plurality of protrusions 531 arranged at intervals can cut the arc, so that the disappearance of the arc is accelerated.

Fig. 8 is a schematic diagram illustrating a distribution of a magnetic field generated by a transfer device of a contact quenching system according to an embodiment of the present disclosure.

Referring to fig. 8, in some alternative embodiments, the arc extinguishing assembly 2 further includes a transfer device 6, the transfer device 6 is located at the outer periphery of the movable contact 12 and the arc extinguishing assembly 2, and the cooling ring 5 is located between the transfer device 6 and the movable contact 12. The transfer device 6 comprises a first permanent magnet 61 and a second permanent magnet 62 with different polarities, and the arc is transferred to the arc extinguishing assembly 2 under the action of the magnetic fields generated by the first permanent magnet 61 and the second permanent magnet 62.

The magnetic field generated by the transfer device 6 covers the movement path of the arc so that the arc is transferred to the arc extinguishing assembly 2 under the action of the magnetic field.

Optionally, the value range of the included angle α between the direction of the maximum magnetic induction line between the first permanent magnet 61 and the second permanent magnet 62 and the second direction Y is 20 ° or more and 45 ° or less.

This arrangement allows a substantial portion of the arc to be deflected in a predetermined direction to the first arc chute 21 and the second arc chute 22.

As shown in fig. 8, a rectangular coordinate system is established with a second plane parallel to the contact plane of the movable contact 12 and the stationary contact 11 as a horizontal plane, with a connecting line parallel to the second direction and passing through the driving central axis 31 as an a-axis, and with a connecting line parallel to the first direction and passing through the driving central axis 31 as an B-axis.

The first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 are located on the outer peripheral side of the relative movement area of the movable contact 12 and the fixed contact 11, that is, in the plane of the top view shown in fig. 8, the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 are located on both sides of the movable contact 12 along the B axis direction. Alternatively, the first and second arc-extinguishing chambers 21 and 22 may be arranged centrally symmetrically with respect to the origin of the rectangular coordinate system. The first and second permanent magnets 61 and 62 are provided on outer peripheral sides of the first and second arc-extinguishing chambers 21 and 22. Illustratively, the side of the first permanent magnet 61 facing the first arc chute 21 is an S pole, the side of the second permanent magnet 62 facing the second arc chute 22 is an N pole, a magnetic field pointing from the N pole to the S pole is generated between the two, and the dotted lines in fig. 8 indicate the directions of a plurality of magnetic induction lines in the magnetic field generated by the transfer device 6, and the directions of the plurality of magnetic induction lines cover each quadrant of the coordinate system.

Assuming that the fixed contact 11 located in the second quadrant shown in fig. 8 is connected to the positive electrode, and the fixed contact 11 located in the fourth quadrant is connected to the negative electrode, the direction of the return current of the contactor is from the fixed contact 11 in the second quadrant to the movable contact 12, and then from the movable contact 12 to the fixed contact 11 in the fourth quadrant. That is, in fig. 8, the current direction of the arc between the left stationary contact 11 and the movable contact 12 penetrates into the contact plane, and the current direction of the arc between the right stationary contact 11 and the movable contact 12 penetrates out of the contact plane. According to fleming's left-hand rule, an arc generated by separating the moving contact 12 from the static contact 11 is pulled away from a space between the moving contact 12 and the static contact 11 under the action of lorentz force F, and is transferred to the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 in a clockwise direction, and the arc is rapidly cut and cooled through the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22, so that an arc-extinguishing effect is achieved.

The embodiment of the application also provides a contactor, which comprises the contact arc extinguishing system.

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (10)

1. The utility model provides a contact arc extinguishing system of contactor, contactor is including the drive axis, its characterized in that, contact arc extinguishing system includes:

two static contacts;

the arc extinguishing assembly comprises a first arc extinguishing chamber and a second arc extinguishing chamber which are oppositely arranged along a first direction;

the moving contact is positioned between the first arc extinguish chamber and the second arc extinguish chamber, the moving contact is separably contacted with the two fixed contacts and can generate electric arcs when the two fixed contacts are separated, the moving contact comprises a contact body and two extension parts, the contact body is connected with the driving middle shaft, one of the extension parts extends from the contact body to the first arc extinguish chamber, the other extension part extends from the contact body to the second arc extinguish chamber,

the projection part of the extension part along the first direction covers the corresponding arc extinguishing component, and the part of at least one extension part along the first direction, which covers the corresponding arc extinguishing component, is in separable contact with the fixed contact.

2. The contactor arc-quenching system according to claim 1, wherein a projection of the extension portion along a second direction covers the corresponding arc-quenching assembly, a portion of at least one of the extension portions along the second direction covers the corresponding arc-quenching assembly and is detachably contacted with the stationary contact, and the second direction is perpendicular to the first direction.

3. The contact arc extinguishing system of the contactor according to claim 1 or 2, wherein the two extending portions are in one-to-one correspondence with and separably contact with the two stationary contacts.

4. The contact arc extinguishing system of the contactor according to claim 1, wherein the extension portion includes a first surface facing the stationary contact and a protrusion protruding from the first surface, and the extension portion is detachably contacted with the stationary contact through the protrusion.

5. The contact arc extinguishing system of claim 4, wherein the contact body includes a second surface facing a stationary contact, the first surface and the second surface being flush.

6. The contact arc extinguishing system of the contactor according to claim 1, wherein the contact body comprises a first end portion and a second end portion which are oppositely arranged along a second direction, and the two extending portions are connected with the first end portion and the second end portion in a one-to-one correspondence manner;

the included angle between the extension part and the second direction is more than or equal to 30 degrees and less than or equal to 80 degrees, wherein the second direction is perpendicular to the first direction.

7. The contact arc extinguishing system of the contactor according to claim 1, further comprising a cooling ring, wherein the cooling ring is a ring-shaped structure body having a hollow portion, the arc extinguishing member is disposed in the hollow portion, and the cooling ring surrounds at least a part of a moving path of the movable contact to cool the arc.

8. The contactor arc quenching system according to claim 7, wherein the cooling ring comprises an inner surface forming the hollow portion and a cooling portion provided to be convex with respect to the inner surface and provided in a region of the cooling ring adjacent to at least one of the two extensions, the cooling ring cooling the arc through the cooling portion.

9. The contactor contact quenching system according to claim 8, wherein in adjacent cooling portions and extension portions, a projection of the cooling portion on a first plane along an arrangement direction of the two extension portions at least partially overlaps a projection of a movement path of the extension portion on the first plane along the arrangement direction of the two extension portions.

10. A contactor, characterized by comprising a contact quenching system according to any of claims 1-9.

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