CN115410862A - Arc extinguishing system of contactor and contactor - Google Patents

Abstract

The application provides an arc extinguishing system and contactor of contactor, contactor include electromagnetic system and contact system, and electromagnetic system includes the drive axis, and the contact system includes static contact and moving contact, and the moving contact is connected with the drive axis, and the arc extinguishing system includes: the arc extinguish chamber is arranged on the outer peripheral side of a relative motion area of the moving contact and the static contact; at least one of the moving contact and the fixed contact is connected with one end, corresponding to the arc extinguish chamber, of the arc striking device in an equipotential manner through the arc striking device, and the arc striking device is used for leading out an arc root of an electric arc generated by separating the moving contact and the fixed contact from the contact system; the transfer device is positioned on the outer peripheral sides of the arc extinguish chamber and the arc striking device and comprises a pair of permanent magnets which are symmetrically arranged by taking the driving central shaft as a center and have different polarities, and a magnetic field generated between the pair of permanent magnets covers the motion path of the electric arc. This arc extinguishing system can shift the driven contact of electric arc to the explosion chamber fast, shortens arc extinguishing time, improves the reliability of contactor.

Description

Arc extinguishing system of contactor and contactor

Technical Field

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

Background

The contactor is an electric control element, is generally used for switching on and off a power battery system in the field of new energy application, such as electric vehicles, and can switch off the high-voltage battery system when accidents happen.

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 by the electric arc, the reliability of the operation is reduced, and even an accident may be caused.

Disclosure of Invention

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

In a first aspect, an embodiment of the present application provides an arc extinguishing system of contactor, and electromagnetic system includes the drive axis, and contact system includes static contact and moving contact, and the moving contact is connected with the drive axis, and the static contact is located the both sides of drive axis and with the detachable contact of moving contact, and arc extinguishing system includes: the arc extinguish chamber is arranged on the outer peripheral side of a relative motion area of the moving contact and the static contact; at least one of the moving contact and the fixed contact is connected with one end, corresponding to the arc extinguish chamber, of the arc striking device in an equipotential manner through the arc striking device, and the arc striking device is used for leading out an arc root of an electric arc generated by separating the moving contact and the fixed contact from the contact system; the transfer device is positioned on the outer peripheral sides of the arc extinguish chamber and the arc striking device and comprises a pair of permanent magnets which are symmetrically arranged by taking the driving center shaft as a center and have different polarities, and a magnetic field generated between the pair of permanent magnets covers the motion path of the electric arc so that the electric arc is transferred to the arc extinguish chamber through the arc striking device under the action of the magnetic field.

According to any one of the embodiments of the present application, an orthographic projection of the movable contact in a first plane extends along a first direction, an orthographic projection of the arc extinguishing chamber in the first plane is located on two sides of an orthographic projection of the driving center axis in the first plane along a second direction, and the arc striking device draws out an arc root of an electric arc along the first plane, wherein the first plane is parallel to a contact plane of the movable contact and the fixed contact, the first direction is a connecting line direction of the orthographic projection of the fixed contact and the driving center axis in the first plane, and the first direction intersects with the second direction.

According to any one of the foregoing embodiments of the present application, the arc striking device includes a first arc striking component, the first arc striking component extends from one end of the movable contact, which is in contact with the fixed contact, toward the arc extinguishing chamber, and in a first plane, a value range of an included angle θ between an extending direction of the first arc striking component and the first direction is: theta is more than or equal to 60 degrees and less than or equal to 75 degrees.

According to any one of the embodiments of the present application, the movable contact includes a first end and a second end opposite to each other along the first direction, and a third end and a fourth end opposite to each other along the second direction, and the first arc striking member is bent from an end surface of the third end or an end surface of the fourth end to a direction away from the fixed contact.

According to any one of the previous embodiments of the application, the arc extinguishing chamber comprises a plurality of grid sheets stacked in a direction perpendicular to the first plane, and the first arc striking part is equipotentially connected with the grid sheet on the side far away from the fixed contact.

According to any one of the embodiments of the present application, the arc striking device further includes a second arc striking component, the second arc striking component is located on one side of the arc extinguishing chamber close to the fixed contact and is stacked with the arc extinguishing chamber, and the second arc striking component is equipotentially connected to the fixed contact or maintains a predetermined gap.

According to any one of the embodiments of the present application, the second arc striking component includes a second body portion and a second bending portion, the second body portion is stacked with the arc extinguishing chamber, and the second bending portion extends from the second body portion toward the stationary contact and abuts against the stationary contact to achieve an equipotential connection.

According to any of the previous embodiments of the present application, the arc extinguishing chamber comprises a plurality of grids stacked in a direction perpendicular to a first plane, each grid comprising a first body portion and a first curved portion, the first body portion being disposed parallel to the first direction in the first plane, the first curved portion extending from one end of the first body portion towards the first arc striking member; an inward-concave arc striking groove is formed in the first bending portion, and the symmetrical center line of the first arc striking piece in the extending direction points to the arc striking groove.

According to any of the previous embodiments of the present application, the dimension of the second body portion in the first direction is smaller than the dimension of the first body portion in the first direction; alternatively, the dimension of the second body portion in the second direction is smaller than the dimension of the first body portion in the second direction.

According to any one of the embodiments of the present application, in the plurality of grids, the size of the first body portion of the grid away from the fixed contact in the first direction is smaller than the size of the first body portions of the remaining grids in the first direction; or the size of the first body part of the grid sheet far away from one side of the static contact along the second direction is smaller than the size of the first body parts of the rest grid sheets along the second direction.

According to any one of the embodiments of the present application, the second arc striking element includes a second body portion and a second bending portion, the second body portion is stacked with the arc extinguishing chamber, and the second bending portion extends from the second body portion toward the stationary contact; a preset gap is kept between the second bending part and the fixed contact.

According to any one of the previous embodiments of the application, the device further comprises an arc isolating chamber and an arc isolating wall, the arc isolating chamber is used for accommodating the arc extinguishing chamber and the contact system, the transfer device is located on the outer peripheral side of the arc isolating chamber, and the arc isolating wall is located between the arc extinguishing chamber and the arc isolating chamber.

According to any one of the embodiments of the present application, the arc striking device further includes an arc striking plate, the arc extinguishing chamber includes a plurality of grid pieces stacked in a direction perpendicular to the first plane, the arc striking plate is connected to the grid piece on a side of the arc extinguishing chamber far away from the fixed contact, and the first arc striking piece is equipotentially connected to the arc striking plate when the first arc striking piece is far away from the stroke end of the fixed contact.

According to any of the previous embodiments of the present application, the permanent magnet has an arc-shaped structure, and the central angle of the permanent magnet is greater than or equal to 90 °.

In a second aspect, embodiments of the present application further provide a contactor, including an arc extinguishing system of the contactor as described above.

The arc extinguishing system of contactor that this application embodiment provided, including explosion chamber, striking device and transfer device, the striking device draws the arc root of the electric arc that moving contact and static contact separation produced from the contact system, transfer device produces the magnetic field that covers the electric arc motion route to shift electric arc to the explosion chamber and carry out the arc extinguishing, wherein at least one in moving contact and static contact passes through striking device and explosion chamber equipotential connection, can shift the arc root of electric arc from the one end of contact system to the explosion chamber fast, shorten arc extinguishing time, accelerate the arc extinguishing process, improve the reliability of contactor.

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 illustrates a cross-sectional view of a contactor according to an embodiment of the present application;

FIG. 2 illustrates a partial schematic diagram of the contact system, arc extinguishing system, and electromagnetic system in the contactor shown in FIG. 1;

FIG. 3 illustrates a schematic distribution of a magnetic field generated by a transfer device of the arc extinguishing system shown in FIG. 2;

FIG. 4 illustrates a partial block diagram of an arc extinguishing system according to an embodiment of the present application;

FIG. 5 is a schematic diagram illustrating the location of the arc root of the arc in the arc extinguishing system of FIG. 4;

FIG. 6 illustrates a top view of the arc extinguishing system shown in FIG. 5;

fig. 7 is a schematic view illustrating a structure of another second arc striking member in the arc extinguishing system shown in fig. 4;

FIG. 8 is a schematic diagram illustrating the location of the arc root of the arc in the arc extinguishing system of FIG. 7;

fig. 9 shows a schematic view of another arc chute in the arc extinguishing system shown in fig. 7;

fig. 10 illustrates a schematic diagram of an arc extinguishing chamber in the arc extinguishing system shown in fig. 4;

fig. 11 is a schematic view illustrating another second arc striking member of the arc extinguishing system shown in fig. 4;

FIG. 12 illustrates a partial block diagram of an arc extinguishing system according to another embodiment of the present application;

FIG. 13 is a schematic diagram illustrating the location of the arc root of the arc in the arc extinguishing system of FIG. 12;

fig. 14 illustrates a schematic structural view of an arc extinguishing chamber of the arc extinguishing system shown in fig. 12;

fig. 15 is a schematic view illustrating an assembled structure of an arc-extinguishing chamber and a barrier in the arc extinguishing system shown in fig. 12;

figure 16 shows an assembly structure schematic diagram of the arc-isolating wall and the arc-extinguishing chamber in figure 15;

FIG. 17 shows a schematic structural view of the flash barrier of FIG. 16;

fig. 18 illustrates a partial schematic of an arc extinguishing system according to another embodiment of the present application;

fig. 19 shows a schematic structural view of an arc runner and contact system in the arc extinguishing system shown in fig. 18;

fig. 20 is a schematic view showing the structure of the arc runner in fig. 19.

Reference numerals:

1. a contact system;

11. static contact; 12. a moving contact; 121. a first end; 122. a third end;

2. an arc extinguishing system;

21. an arc extinguishing chamber; 211. a grid sheet; 212. a first body part; 213. a first curved portion; 214. an arc striking groove;

22. an arc striking device; 221. a first arc striking member; 222. a second arc striking member; 223. a second body portion; 224. a second curved portion; 225. a wire; 226. an arc striking plate; 227. a middle portion; 228. an end portion;

23. a transfer device; 231. a permanent magnet;

24. an arc barrier wall; 241. a substrate; 242. an avoidance groove;

25. an arc-isolating chamber;

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;

A. a static contact arc root; B. a moving contact is arc-root;

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, but 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 should also be noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed and removable connections as well as integral connections; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in this application can be understood as appropriate by one of ordinary skill in the art.

The contactor includes a dc contactor and an ac contactor, and the dc contactor is a contactor used in a dc circuit and mainly used for controlling a dc circuit (a main circuit, a control circuit, an excitation circuit, and the like). Because the attraction coil of the direct current contactor is electrified with direct current, the direct current contactor has no impact starting current, does not generate the phenomenon of violent impact of an iron core, has longer service life relative to the alternating current contactor, and is suitable for occasions of frequent starting and stopping.

Fig. 1 shows a cross-sectional view of a contactor according to an embodiment of the present application.

Referring to fig. 1, the contactor includes a housing 4, and an electromagnetic system 3 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 central shaft 31, and each of the two fixed contacts 11 can be separably contacted with the movable contact 12. 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 magnetic conductive metal material, such as electrically pure iron, and has an outer surface plated with an electroplating solution. 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 moving contact 12 is disconnected from the fixed contact 11. However, when the coil 34 is powered off, the output loop has high voltage and large current, so that an electric arc is generated between the moving contact 12 and the static contact 11, the generation of the electric arc delays the switching off of the circuit, and even the moving contact 12 and the static contact 11 are burnt by high electric arc energy, so that the moving contact 12 and the static contact 11 are fusion-welded, and in a severe case, dangers such as fire and explosion can occur.

In view of this, the contactor provided by the embodiment of the present application further includes an arc extinguishing system 2, which is used for rapidly extinguishing an arc between contacts when a circuit is opened, so as to improve the reliability of the contactor.

Fig. 2 shows a partial structural schematic diagram of a contact system, an arc extinguishing system and an electromagnetic system in the contactor shown in fig. 1.

Referring to fig. 2, an arc extinguishing system 2 of a contactor according to an embodiment of the present application includes an arc extinguishing chamber 21, an arc striking device 22, and a transfer device 23. The arc extinguishing system 2 can be used for a direct current contactor and an alternating current contactor. For convenience of description, the embodiments of the present application are described by taking a dc contactor as an example.

The arc extinguishing chamber 21 is disposed on the outer peripheral side of the relative movement region between the movable contact 12 and the fixed contact 11. Alternatively, the number of the arc-extinguishing chambers 21 is two, and the two arc-extinguishing chambers 21 are oppositely arranged on the outer peripheral side of the relative movement area of the moving contact 12 and the fixed contact 11.

At least one of the moving contact 12 and the static contact 11 is connected with one end corresponding to the arc extinguish chamber 21 in an equipotential manner through an arc striking device 22, and the arc striking device 22 is used for leading out an arc root of an arc generated by separating the moving contact 12 from the static contact 11 from the contact system 1. The arc root is a portion of the moving contact 12 and the stationary contact 11 that are respectively in contact with the arc, that is, an end portion of the arc.

The transfer device 23 is located at the outer periphery side of the arc extinguishing chamber 21 and the arc striking device 22, the transfer device 23 includes a pair of permanent magnets 231 which are symmetrically arranged with the center of the driving shaft 31 as the center and have different polarities, and a magnetic field generated between the pair of permanent magnets 231 covers the moving path of the arc, so that the arc is transferred to the arc extinguishing chamber 21 through the arc striking device 22 under the action of the magnetic field.

Fig. 3 shows a schematic diagram of the distribution of the magnetic field generated by the transfer device of the arc extinguishing system shown in fig. 2.

As shown in fig. 3, a rectangular coordinate system is established with a first plane parallel to the contact plane of the movable contact 12 and the fixed contact 11 as a horizontal plane, a first direction of a connecting line between the two fixed contacts 11 passing through the driving central axis 31 as an X axis, and a second direction perpendicular to the X axis as a Y axis. The two arc-extinguishing chambers 21 are located on the outer peripheral side of the relative movement area between the moving contact 12 and the fixed contact 11, that is, in the plane of the top view shown in fig. 3, the two arc-extinguishing chambers 21 are located on two sides of the moving contact 12 along the Y-axis direction, and the two arc-extinguishing chambers 21 and the moving contact 12 are not overlapped with each other. Alternatively, the two arc-extinguishing chambers 21 may be arranged symmetrically with respect to the origin center of the rectangular coordinate system. A pair of permanent magnets 231 is disposed on the outer peripheral side of the arc extinguish chamber 21, wherein one side of one permanent magnet 231 facing the arc extinguish chamber 21 is an N pole, and one side of the other permanent magnet 231 facing the arc extinguish chamber 21 is an S pole, a magnetic field pointing from the N pole to the S pole is generated therebetween, a dotted line in fig. 3 shows a plurality of magnetic induction line directions in the magnetic field generated by the transfer device 23, and the plurality of magnetic induction line directions cover each quadrant of the coordinate system. It should be noted that the outer circumference side mentioned in the present embodiment is not limited to the outside of a specific circumference structure, as long as one is located outside the other and the orthographic projections of the two in the first plane do not overlap each other.

Assuming that the static contact 11 located on the negative half axis side of the X-axis shown in fig. 3 is connected to the positive electrode, and the static contact 11 located on the positive half axis side of the X-axis is connected to the negative electrode, the direction of the return current of the contactor is from the static contact 11 located on the negative half axis side of the X-axis to the movable contact 12, and then from the movable contact 12 to the static contact 11 located on the positive half axis side of the X-axis. That is, the arc direction between the fixed contact 11 and the movable contact 12 on the left side in fig. 3 penetrates into the contact plane, and the arc direction between the fixed contact 11 and the movable contact 12 on the right side 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, the arc is transferred to the arc extinguishing chamber 21 in a clockwise direction through the arc striking device 22, and the arc is rapidly cooled through the arc extinguishing chamber 21, so that the arc extinguishing effect is achieved.

Further, at least one of the moving contact 12 and the static contact 11 is connected to the corresponding end of the arc extinguish chamber 21 through the arc striking device 22 in an equipotential manner, that is, the moving contact 12 is connected to the corresponding end of the arc extinguish chamber 21 in an equipotential manner through the arc striking device 22, or the static contact 11 is connected to the corresponding end of the arc extinguish chamber 21 in an equipotential manner through the arc striking device 22, so that the arc root of the arc can be quickly transferred from at least one end of the contact system 1 to the arc extinguish chamber 21, the arc extinguishing time is shortened, the arc extinguishing process is accelerated, and the reliability of the contactor is improved.

It should be noted that, when the static contact 11 located on the negative half axis side of the X-axis is connected to the negative electrode and the static contact 11 located on the positive half axis side of the X-axis is connected to the positive electrode, the direction of the return current of the contactor is changed, and the moving path of the arc can be ensured by changing the direction of the magnetic field between the two permanent magnets 231. Alternatively, the magnetic field direction between the two permanent magnets 231 may be kept unchanged, so that the arc enters the arc extinguish chamber 21 in the counterclockwise direction, but at this time, the position of the arc striking device 22 needs to be changed, and the specific structure of the arc striking device 22 will be described in detail later.

In addition, in the embodiment of the present application, the arc extinguishing chamber 21 is disposed on the outer peripheral side of the relative movement region between the movable contact 12 and the fixed contact 11, and under the action of the magnetic field between the pair of permanent magnets 231 of the transfer device 23, the arc striking device 22 draws the arc root of the arc out of the contact system 1 along the first plane, so as to utilize the internal space of the contactor to the maximum extent, reduce the length of the contactor in the movement direction of the movable contact 12, and make the overall structure of the contactor more compact, compared with the technical scheme of disposing the arc extinguishing chamber 21 in the movement direction of the movable contact 12.

The arc extinguishing system 2 of the contactor provided by the embodiment of the application comprises an arc extinguishing chamber 21, an arc striking device 22 and a transfer device 23, wherein the arc striking device 22 leads out an arc root of an electric arc generated by separating a moving contact 12 from a static contact 11 from a contact system 1, and the transfer device 23 generates a magnetic field covering an electric arc moving path and transfers the electric arc to the arc extinguishing chamber 21 for arc extinguishing. At least one of the moving contact 12 and the static contact 11 is equipotentially connected to the arc extinguish chamber 21 through the arc striking device 22, so that the arc root of the arc can be quickly transferred from at least one end of the contact system 1 to the arc extinguish chamber 21, the arc extinguishing time is shortened, the arc extinguishing process is accelerated, and the reliability of the contactor is improved.

The specific structure of the arc extinguishing system of the contactor provided by the embodiment of the present application is described in further detail below with reference to fig. 3.

In some embodiments, an orthographic projection of the movable contact 12 in a first plane parallel to a contact plane of the movable contact 12 and the fixed contact 11 extends along a first direction X, an orthographic projection of the arc extinguishing chamber 21 in the first plane is located on two sides of an orthographic projection of the central driving shaft 31 in the first plane along a second direction Y, and the arc striking device 22 draws out an arc root of an electric arc along the first plane, wherein the first plane is parallel to the contact plane of the movable contact 12 and the fixed contact 11, the first direction X is a connecting line direction of the orthographic projection of the central driving shaft 31 and the fixed contact 11 in the first plane, and the first direction X intersects the second direction Y. Optionally, the first direction X and the second direction Y are perpendicular to each other. The contact plane is a plane where one surface of the moving contact 12 close to the fixed contact 11 is located when the moving contact 12 is in contact with the fixed contact 11.

Specifically, in the first plane, the arc-extinguishing chambers 21 are located on both sides of the first direction X, and the movable contact 12 extends along the first direction X, that is, the relative position between the two arc-extinguishing chambers 21 is not in the same line with the extending direction of the movable contact 12, and this arrangement reduces the length of the contactor in the first direction X, so that the overall structure of the contactor is more compact. Alternatively, the movable contact 12 has a rectangular structure in an orthographic projection on the first plane, a long side of the rectangular structure extends along the first direction X, and a wide side extends along the second direction Y.

As described above, the arc generated by separating the moving contact 12 from the stationary contact 11 is subject to the lorentz force under the action of the magnetic field to generate movement, and is deflected toward the arc extinguishing chamber 21 under the guidance of the arc striking device 22, so that the arc is transferred from the contact system 1 to the arc extinguishing chamber 21. In order to prevent the arc from deflecting to the inner wall of the housing 4 or in other directions to damage the contactor, it is necessary to set the magnetic field direction of the diverting means 23 and the arc striking direction of the arc striking means 22 so that the arc is deflected along a predetermined path to the arc extinguishing chamber 21.

As shown in fig. 3, a direction of a center connecting line between the stationary contact 11 and the driving central shaft 31 is an X-axis direction, and a maximum magnetic induction line B in a magnetic field generated by the two permanent magnets 231 passes through an origin of the rectangular coordinate system and coincides with a center connecting line between the two permanent magnets 231. In general, the maximum magnetic induction line B is the position where the magnetic field is most concentrated, and the lorentz force F of the arc is the largest at the position where the maximum magnetic induction line B is located, that is, the magnetic field has the largest influence on the arc deflection direction. Therefore, the deflection range of the arc under the action of the Lorentz force F can be determined according to the value range of the included angle between the maximum magnetic induction line B and the X axis.

In some embodiments, in a first plane parallel to a contact plane of the movable contact 12 and the fixed contact 11, an included angle α between a direction of a maximum magnetic induction line between the pair of permanent magnets 231 and a first direction X in which a central connection line of the fixed contact 11 and the driving central shaft 31 is located has a value range: alpha is more than or equal to 15 degrees and less than or equal to 30 degrees. The applicant has found in practice that when the angle α satisfies the above condition, a substantial portion of the arc may be deflected into the arc chamber in a predetermined direction.

It should be noted that the first plane may be any plane parallel to the contact plane, and the first plane only illustrates the operation principle of the arc extinguishing system 2 and the arrangement of the corresponding components according to a projection relationship, rather than considering the distribution of the magnetic induction lines and the components of the arc extinguishing system 2 to exist only on this plane, which is not described herein too much.

In some embodiments, the permanent magnet 231 is an arc-shaped structure, and the central angle of the permanent magnet 231 is greater than or equal to 90 °. As shown in fig. 3, the two permanent magnets 231 are disposed around the moving contact 12 and the arc extinguishing chamber 21 to form a semi-enclosed structure, the magnetic field is formed in the space enclosed by the pair of permanent magnets 231, the coverage area of the magnetic field is positively correlated to the size of the radian of the permanent magnet 231, that is, the larger the radian of the permanent magnet 231, the more the coverage area of the magnetic field is. Optionally, the permanent magnet 231 is of an arc tile-shaped sheet structure, and neodymium iron boron or ferrite is used as a raw material.

By setting the central angle of the permanent magnet 231 to be greater than or equal to 90 °, it is possible to ensure that the entire contact system 1 is located within the magnetic field coverage range, and at the same time, most of the arc extinguishing chambers 21 are also located within the magnetic field coverage range, thereby ensuring that the magnetic field completely covers the movement path of the arc. In addition, because the pair of permanent magnets 231 are of an arc-shaped structure, the magnetic field is more concentrated in the arc extinguishing system 2, and the magnetic field density is distributed inwards towards the central position, so that the permanent magnets 231 act on the arc extinguishing system in the smallest size as possible, and more magnetic lines of force of the magnetic field act on the moving path of the electric arc.

Fig. 4 illustrates a partial structure diagram of an arc extinguishing system according to an embodiment of the present application, fig. 5 illustrates a position diagram of an arc root of an arc in the arc extinguishing system illustrated in fig. 4, and fig. 6 illustrates a top view of the arc extinguishing system illustrated in fig. 5.

As shown in fig. 4 and 5, in some embodiments, the arc ignition device comprises a first arc ignition member 221, and the first arc ignition member 221 extends from an end of the movable contact 12 contacting the fixed contact 11 toward the arc extinguishing chamber 21. Alternatively, the number of the first arc ignition members 221 is two, and two first arc ignition members 221 are disposed on two opposite sides of the movable contact 12. Therefore, the first arc striking component 221 can deflect the arc generated at one end of the movable contact 12 to the arc extinguish chamber 21 under the action of the magnetic field, and the burning of the movable contact 12 and the fixed contact 11 at the breaking position is reduced.

As mentioned above, the arc at one end of the movable contact 12 is deflected to the arc extinguishing chamber 21 by the first arc-striking member 221, when the extending direction of the first arc-striking member 221 is consistent with the direction of the lorentz force F, the arc will be deflected according to the preset path, and the direction of the lorentz force F is perpendicular to the direction of the magnetic induction line at the position, and the first arc-striking member 221 is approximately located at the middle position of the pair of permanent magnets 231, so the direction of the magnetic induction line of the magnetic field at the position corresponding to the first arc-striking member 221 is approximately parallel to the direction of the maximum magnetic induction line B, and therefore the direction of the lorentz force F received at the first arc-striking member 221 is almost the same as the direction of the lorentz force F received at the maximum magnetic induction line B. When the range of the included angle α between the direction of the maximum magnetic induction line B between the pair of permanent magnets 231 and the first direction X in which the central connecting line of the stationary contact 11 and the driving center shaft 31 is located is 15 ° or more and 30 ° or less, the included angle θ between the extending direction of the first arc ignition piece 221 toward the arc extinguish chamber 21 and the first direction X is complementary to α.

Therefore, in a first plane parallel to the contact plane of the movable contact 12 and the fixed contact 11, the range of the included angle θ between the extending direction of the first arc striking part 221 and the first direction X in which the central connecting line of the fixed contact 11 and the driving central shaft 31 is located is: theta is more than or equal to 60 degrees and less than or equal to 75 degrees. The included angle θ of the first arc-striking component 221 is the arc-striking angle of the movable contact 12. Thus, the directions of the first arc striking piece 221 and the lorentz force F point to the arc extinguishing chamber 21, and the arc guiding effect of the arc striking device 22 is better.

As shown in fig. 6, in some embodiments, the movable contact 12 includes a first end 121 and a second end opposite to each other along a first direction X where the fixed contact 11 is connected to a center of the central driving shaft 31, and a third end 122 and a fourth end opposite to each other along a second direction Y perpendicular to the first direction X, and the first arc striking member 221 is bent from an end surface of the third end 122 or an end surface of the fourth end to a direction away from the fixed contact 11. By the arrangement, the arc at one end of the movable contact 12 can be introduced into the arc extinguishing chamber 21 in a short path, and the arc striking process is accelerated.

With continued reference to fig. 4, in some embodiments, the arc extinguish chamber 21 includes a plurality of grid plates 211 stacked in a direction perpendicular to the contact plane or the first plane, and the first arc striking member 221 is equipotentially connected to the grid plate 211 on a side far from the stationary contact 11. So set up, can shift the arc root B of electric arc to the grid 211 department of keeping away from static contact 11 one side of explosion chamber 21 fast, avoid the arc root B of electric arc to reside for a long time in moving contact 12 one end, prevent that moving contact 12 from taking place the fusion welding, be favorable to improving moving contact 12's life.

Optionally, the first arc ignition member 221 and the grid sheet 211 at a side far from the fixed contact 11 are connected to each other by an equipotential line 225. The conducting wire 225 may be designed as a plurality of rings of annularly wound conducting wires, and the length is automatically adjusted according to the distance between the moving contact 12 and the fixed contact 11, so as to prevent the moving contact 12 from breaking the conducting wire 225 during the moving process. The wire 225 may also be a linear wire that meets the stroke requirement of the movable contact 12, as long as the movement of the movable contact 12 is not affected.

In some embodiments, the arc ignition device 22 further includes a second arc ignition member 222, the second arc ignition member 222 is located on a side of the arc extinguishing chamber 21 close to the stationary contact 11 and is stacked with the arc extinguishing chamber 21, and the second arc ignition member 222 is in equipotential connection with the stationary contact 11. Thereby, the arc root a of the arc at one end of the stationary contact 11 can be rapidly transferred to the second arc ignition member 222.

Further, the second arc striking element 222 includes a second body portion 223 and a second bending portion 224, the second body portion 223 is stacked with the arc extinguishing chamber 21, and the second bending portion 224 extends from the second body portion 223 toward the fixed contact 11 and abuts against the fixed contact 11 to achieve equipotential connection. Wherein the first bend 213 (see fig. 7) and the second bend 224 are located on the same side of the arc chute 21.

Optionally, the second bending portion 224 has a curved surface matched with the outer contour of the static contact 11, and the curved surface is abutted to the static contact 11 to realize equipotential connection, so that the arc root a of the electric arc at one end of the static contact 11 is uniformly transferred to the second arc initiating piece 222, the arc root a of the electric arc is prevented from residing at one end of the static contact 11 for a long time, fusion welding of the static contact 11 is prevented, and the service life of the static contact 11 is prolonged.

Therefore, the movable contact 12 is equipotentially connected to the grid 211 of the arc extinguish chamber 21 on the side far from the fixed contact 11 through the first arc striking piece 221, and the fixed contact 11 is equipotentially connected to the arc extinguish chamber 21 on the side near the fixed contact 11 through the second arc striking piece 222. When the moving contact 12 of the contactor is disconnected from the stationary contact 11, the moving contact 12 moves in a direction away from the stationary contact 11, and an arc is generated therebetween. Under the action of the lorentz force F of the magnetic field, the arc root B at one end of the moving contact 12 and the arc root a at one end of the static contact 11 can be led out of the contact system 1 at the same time, and transferred to the air to be elongated, broken and quickly extinguished, so that the circuit safety of the contactor is guaranteed. The arc extinguishing system 2 in this embodiment is mainly suitable for a small current contactor, and in order to further improve the arc extinguishing effect, the arc can be elongated by changing the arc root position of the arc, so as to guide the arc to the arc extinguishing chamber 21 for arc extinguishing.

Fig. 7 is a schematic view illustrating a structure of another second arc striking member in the arc extinguishing system shown in fig. 4, and fig. 8 is a schematic view illustrating a position of an arc root of an arc in the arc extinguishing system shown in fig. 7.

In order to guide the arc to the arc extinguishing chamber 21 for arc extinguishing, in some embodiments, as shown in fig. 7 and 8, the second body portion 223 of the second arc striking member 222 has a smaller dimension along the first direction X than the first body portion 212. Optionally, the dimension of the second body portion 223 in the first direction X is half of the dimension of the first body portion 212 in the first direction X. The dimension of the second body portion 223 along the first direction X is the length dimension of the second arc striking member 222.

In this way, the arc root a of the arc at the end of the fixed contact 11 is transferred to the end of the second body 223 along the second bending portion 224 of the second arc striking component 222, while the arc root B of the arc at the end of the movable contact 12 remains unchanged, so that the arc between the movable contact 12 and the fixed contact 11 can be lengthened, and the cutting position of the arc in the arc extinguish chamber 21 can be adjusted.

Fig. 9 shows a schematic view of another arc chute in the arc extinguishing system shown in fig. 7.

In some embodiments, as shown in fig. 9, among the plurality of grids 211 of the arc extinguish chamber 21, the first body portion 212 of the grid 211 at a side far away from the fixed contact 11 has a smaller size in the first direction X than the first body portions 212 of the remaining grids 211. Further optionally, the size of the first body portion 212 of the grid 211 at the side far from the fixed contact 11 along the first direction X is half of the size of the first body portions 212 of the remaining grids 211 along the first direction X. The dimension of the first body portion 212 of the grid 211 at the side far from the fixed contact 11 along the first direction X is the length dimension of the grid 211.

In this way, the position of the arc root B of the arc at one end of the movable contact 12 at the end corresponding to the length of the grid 211 is changed, while the position of the arc root a of the arc at one end of the fixed contact 11 is kept unchanged or changed, so that the cutting position of the arc in the arc extinguish chamber 21 can be adjusted.

Therefore, in the present embodiment, when the movable contact 12 is equipotentially connected to the grid 211 of the arc extinguish chamber 21 on the side far from the stationary contact 11 through the first arc striking component 221, and the stationary contact 11 is equipotentially connected to the arc extinguish chamber 21 on the side near the stationary contact 11 through the second arc striking component 222, the position of the arc root a at one end of the stationary contact 11 in the length direction of the second arc striking component 222, or the position of the arc root B at one end of the movable contact 12 in the length direction of the grid 211 of the arc extinguish chamber 21, or both positions thereof can be adjusted at the same time, so as to lengthen the arc, change the cutting position after the arc is transferred to the arc extinguish chamber 21, enhance the diffusion and cooling effects of the arc in the arc extinguish chamber 21, shorten the arc extinguishing time, and improve the reliability of the contactor.

Fig. 10 illustrates a schematic diagram of an arc extinguishing chamber in the arc extinguishing system shown in fig. 4.

As shown in fig. 10, the arc extinguishing system 2 further includes an arc-isolating chamber 25, the arc-isolating chamber 25 is used for accommodating the arc-extinguishing chamber 21 and the contact system 1, and the transfer device 23 is located on the outer periphery side of the arc-isolating chamber 25. The arc extinguishing chamber 21 and the contact system 1 are housed in an arc-separating chamber 25, the magnetic field generated by a pair of permanent magnets 231 of the transfer device 23 acting on the arc-separating chamber 25 and providing a lorentz force F moving the arc so as to deflect it into the arc extinguishing chamber 21. The presence of the arc-isolating chamber 25 can isolate the permanent magnet 231 from the arc-extinguishing chamber 21, preventing deterioration of the magnetic characteristics of the permanent magnet 231, thereby maintaining the magnetism of the permanent magnet 231 for a long period of time and allowing the arc to disappear quickly and reliably.

Further, in order to prevent the arc from burning out the arc-isolating chamber 25, it is possible to change the position of the arc root of the arc on the second arc striking member 222 and the grid 211 of the arc extinguishing chamber 21.

Fig. 11 is a schematic view illustrating a structure of another second arc striking member in the arc extinguishing system shown in fig. 4.

In some embodiments, as shown in fig. 11, a dimension of the second body portion 223 of the second arc ignition member 222 along the second direction Y is smaller than a dimension of the first body portion 212 of the grid 211 of the arc extinguishing chamber 21 along the second direction Y. Optionally, the size of the second body portion 223 in the second direction Y is half of the size of the first body portion 212 in the second direction Y. Wherein, the dimension of the second body portion 223 along the second direction Y is the width dimension of the second arc-striking piece 222.

In this way, the arc root a of the arc at the end of the stationary contact 11 is shortened in the radial direction of the arc-isolating chamber 25 by the second main body 223 of the original second arc-striking member 222, so that the arc can be prevented from burning out the arc-isolating chamber 25.

In some embodiments, among the plurality of grids 211 of the arc extinguish chamber 21, the first body portion 212 of the grid 211 on the side far away from the fixed contact 11 has a smaller dimension in the second direction Y than the first body portions 212 of the remaining grids 211. Further optionally, the size of the first body portion 212 of the grid 211 at the side far from the fixed contact 11 along the second direction Y is half of the size of the first body portions 212 of the remaining grids 211 along the second direction Y. The dimension of the first body 212 of the grid 211 far from the stationary contact 11 along the second direction Y is the width dimension of the grid 211.

Therefore, in the present embodiment, when the movable contact 12 is equipotentially connected to the grid 211 of the arc extinguish chamber 21 on the side far from the fixed contact 11 through the first arc striking component 221, and the fixed contact 11 is equipotentially connected to the arc extinguish chamber 21 on the side near the fixed contact 11 through the second arc striking component 222, the position of the arc root B of the arc at one end of the movable contact 12 on the grid 211 is shortened along the radial direction of the arc isolating chamber 25, so as to prevent the arc from burning the arc isolating chamber 25.

Fig. 12 is a partial structural view illustrating an arc extinguishing system according to another embodiment of the present application, fig. 13 is a view illustrating a position of an arc root of an arc in the arc extinguishing system shown in fig. 12, and fig. 14 is a view illustrating a structure of an arc extinguishing chamber of the arc extinguishing system shown in fig. 12.

Referring to fig. 12 and 13, another arc extinguishing system is provided in the present embodiment, which is similar to the arc extinguishing system shown in fig. 2 to 6, except that a predetermined gap is maintained between the stationary contact 11 and the second arc striking member 222.

Specifically, the second arc striking member 222 includes a second body portion 223 and a second bending portion 224, the second body portion 223 is stacked with the arc extinguishing chamber 21, the second bending portion 224 extends from the second body portion 223 toward the stationary contact 11, and a predetermined gap is maintained between the second bending portion 224 and the stationary contact 11.

Therefore, the arc root B of the electric arc at one end of the movable contact 12 is quickly transferred to the grid sheet 211 at the side of the arc extinguish chamber 21 far away from the static contact 11 through the first arc striking part 221, and the arc root a of the electric arc at one end of the static contact 11 is transferred to the second arc striking part 222 after being delayed for a period of time, so that the electric arc generated when the movable contact 12 is disconnected from the static contact 11 can be lengthened, and the diffusion and cooling effects of the electric arc in the arc extinguish chamber 21 are enhanced.

The operation principle of the arc extinguishing chamber of the arc extinguishing system according to the embodiment of the present application will be described in detail with reference to fig. 14.

As shown in fig. 14, each of the grids 211 of the arc extinguish chamber 21 includes a first body portion 212 and a first bending portion 213, and in a first plane parallel to a contact plane of the movable contact 12 and the fixed contact 11, the first body portion 212 is disposed parallel to a first direction X in which a central line of the fixed contact 11 and the central driving shaft 31 is located, and the first bending portion 213 extends from one end of the first body portion 212 toward the first arc striking member 221. Optionally, the first curved portion 213 is provided with an arc-striking groove 214 recessed inward, and a symmetrical center line of the first arc-striking member 221 in the extending direction points to the arc-striking groove 214.

Optionally, the grid piece 211 is a plate-shaped structure, and the material may be a material with magnetic permeability, such as copper, iron magnet, ceramic, etc., so as to reduce the magnetic resistance of the arc extinguish chamber 21, and make the magnetic lines of force of the magnetic field located at the edge have a tendency of contracting towards the arc extinguish chamber 21, so that the path of the magnetic lines of force of the magnetic field is bent, and these bent magnetic lines of force help to deflect the moving direction of the electric arc to the arc extinguish chamber 21, so as to sufficiently utilize the space of the arc extinguish chamber 21 to cool and extinguish the electric arc, thereby improving the utilization rate of the internal space of the contactor, and making the arc extinguish effect stronger.

In addition, the first body portion 212 is integrally connected to the first bending portion 213, and the arc striking groove 214 is disposed at an end of the first bending portion 213 away from the first body portion 212. The opening direction of the arc ignition groove 214 faces the deflection direction of the first arc ignition member 221 of the movable contact 12. Since the first arc-striking member 221 and the arc-striking groove 214 are approximately located at the middle position of the pair of permanent magnets 231, the magnetic induction line direction of the magnetic field at the corresponding position of the first arc-striking member 221 and the arc-striking groove 214 is approximately parallel to the direction of the maximum magnetic induction line B, that is, the direction of the lorentz force F applied to the arc at the position is also directed to the opening direction of the arc-striking groove 214, and the arc moves along a preset path under the action of the magnetic field and deflects to the deep position of the arc-striking groove 214, so as to completely enter the arc-extinguishing chamber 21.

Since the direction perpendicular to the contact plane is the backflow direction of the arc between the moving contact 12 and the fixed contact 11, the plurality of grid pieces 211 are stacked in the direction perpendicular to the contact plane, and can be adjusted according to the movement stroke of the moving contact 12, so as to keep the gap consistent. When the current in the contactor is larger than a specific value, the magnetic field passes through the magnetic flux formed by the arc striking groove 214 to magnetically drive the arc to the deep space of the arc striking groove 214, so that the whole arc formed between the moving contact 12 and the static contact 11 is cut into a plurality of short arcs to form a voltage drop, and the initial dielectric strength of the arc gap is improved to maintain the voltage rise of the arc. If the arc voltage is higher than the voltage of the contactor power supply, the arc is extinguished.

Further, the arc extinguishing chamber 21 stores a gas atmosphere such as air, nitrogen, or hydrogen, and as is clear from gas movement and heat conduction, a high-temperature and high-pressure gas always moves to a low-temperature and low-pressure environment. Therefore, high-temperature and high-pressure gas generated by the elongated electric arc moves along the direction of the outlet of the arc extinguish chamber 21, is cooled by gas atmosphere after entering the arc extinguish chamber 21, and simultaneously drives the arc burning gas to flow and circulate in the arc extinguish chamber 21 by means of the pressure gradient of the arc extinguish system 2. In addition, the plurality of grid plates 211 stacked in the arc extinguish chamber 21 not only increases the capacity of the arc extinguish chamber 21, but also promotes the internal circulation of high-temperature arcing gas on the upper layer of the contactor, thereby fully utilizing the internal space of the arc extinguish chamber 21 to cool the high-temperature gas and extinguish the arc.

In this embodiment, the movable contact 12 is equipotentially connected to the grid 211 of the arc extinguish chamber 21 on the side away from the stationary contact 11 through the first arc striking component 221, for example, the first arc striking component 221 is electrically connected to the corresponding grid 211 through a conducting wire, and the stationary contact 11 and the second arc striking component 222 maintain a predetermined gap, so that the arc root a of the arc at one end of the stationary contact 11 is located at the front end of the second arc striking component 222, that is, the arc root a is located on the side of the second bending portion 224 facing the stationary contact 11, which can elongate the arc generated when the movable contact 12 is disconnected from the stationary contact 11, thereby enhancing the diffusion and cooling effects of the arc in the arc extinguish chamber 21. The arc extinguishing system 2 is particularly suitable for a high-power direct current contactor, because the direct current contactor does not have the process of voltage current zero crossing, the instantaneous temperature of electric arc is higher, the electric arc can be rapidly cooled through lengthening the electric arc, and the phenomenon that the instantaneous high-temperature energy of the electric arc is gathered on the second arc striking part 222 and cannot be diffused to ablate the arc extinguishing chamber 21 is avoided.

Fig. 15 is a schematic view showing an assembly structure of the arc barrier and the arc extinguishing chamber in the arc extinguishing system shown in fig. 12, fig. 16 is a schematic view showing an assembly structure of the arc barrier and the arc extinguishing chamber in fig. 15, and fig. 17 is a schematic view showing a structure of the arc barrier in fig. 16.

Referring to fig. 15-17, in some embodiments, the arc extinguishing system 2 further includes a barrier wall 24, the barrier wall 24 being located between the arc chute 21 and the barrier chamber 25. Optionally, the arc barrier 24 includes a base 241 and a plurality of avoiding grooves 242 disposed on the base 241 in parallel, the plurality of avoiding grooves 242 are disposed in one-to-one correspondence with the plurality of grid pieces 211 of the arc extinguish chamber 21, and the avoiding grooves 242 can accommodate the side edges of the grid pieces 211.

When the moving contact 12 is connected to the grid 211 of the arc extinguish chamber 21 at the side far from the fixed contact 11 through the first arc striking part 221 in an equipotential manner, and the fixed contact 11 and the second arc striking part 222 maintain a predetermined gap, the arc generated when the moving contact 12 is disconnected from the fixed contact 11 can be lengthened, and the arc isolating chamber 25 can be effectively prevented from being burnt by the lengthened arc by arranging the arc isolating wall 24 between the arc extinguish chamber 21 and the arc isolating chamber 25, so that the arc isolating chamber 25 is protected.

Fig. 18 illustrates a partial structural view of an arc extinguishing system according to another embodiment of the present application, fig. 19 illustrates a structural view of an arc striking plate and a contact system in the arc extinguishing system illustrated in fig. 18, and fig. 20 illustrates a structural view of the arc striking plate in fig. 19.

Referring to fig. 18 to 20, another arc extinguishing system is provided in the embodiment of the present application, which is similar to the arc extinguishing system shown in fig. 12 to 17, except that the arc striking device 22 further includes an arc striking plate 226, the arc striking plate 226 is connected to the grid piece 211 of the arc extinguishing chamber 21 on the side away from the stationary contact 11, and the first arc striking element 221 is equipotentially connected to the arc striking plate 226 at the end of the stroke away from the stationary contact 11.

In some embodiments, the second arc-striking member 222 of the arc-striking device 22 is spaced from the fixed contact 11 by a predetermined distance, the arc-striking plate 226 is connected to the adjacent grid 211 by a wire, and the first arc-striking member 221 is connected to the arc-striking plate 226 by an equal potential when being away from the end of the stroke of the fixed contact 11.

Therefore, when the movable contact 12 moves in the direction away from the fixed contact 11 and abuts against the arc striking plate 226, the arc is introduced into the arc extinguishing chamber 21 through the arc striking plate 226, and at the moment, the arc root B of the arc is quickly transferred to the grid piece 211 of the arc extinguishing chamber 21 on the side away from the fixed contact 11 by the first arc striking part 221, so that the first arc striking part 221 can be prevented from being continuously burnt by the arc for a long time, and the movable contact 12 always keeps a good arc striking angle after the movable contact 12 and the fixed contact 11 are repeatedly disconnected, that is, the included angle θ of the first arc striking part 221 can be kept unchanged for a long time. In addition, the arc at one end of the static contact 11 is delayed for a period of time and then transmitted to the second arc-striking component 222, so that the arc generated when the moving contact 12 is disconnected from the static contact 11 is lengthened, and the diffusion and cooling effects of the arc in the arc-extinguishing chamber 21 are enhanced.

In addition, the arc ignition plate 226 is generally S-shaped, and includes a middle portion 227 and two end portions 228 extending from the middle portion 227. The middle portion 227 allows the driving central shaft 31 to pass through, the two arc extinguishing chambers 21 are respectively carried at the two end portions 228 of the S-shaped arc striking plate 226, and the two first arc striking pieces 221 of the movable contact 12 can respectively abut against the two end portions 228 of the arc striking plate 226 correspondingly. Of course, the arc striking plate 226 may have other shapes.

In other embodiments, the second arc-striking member 222 of the arc-striking device 22 is equipotentially connected to the stationary contact 11, the arc-striking plate 226 is disposed with a predetermined gap from the adjacent grid 211, and the first arc-striking member 221 is equipotentially connected to the arc-striking plate 226 when moving away from the end of the travel of the stationary contact 11.

Therefore, the moving contact 12 moves in a direction away from the fixed contact 11 and reaches the end of the stroke, and is connected with the arc striking plate 226 in an equipotential manner, the arc striking plate 226 has a predetermined gap with the adjacent grid sheet 211, and the fixed contact 11 is connected with the second arc striking piece 222 in an equipotential manner. When the moving contact 12 and the static contact 11 are disconnected, the arc root a at one end of the static contact 11 is immediately transferred to the second arc striking component 222, and the arc root B at one end of the moving contact 12 is transferred to the arc extinguishing chamber 21 with a delay. By the arrangement, the electric arc can be elongated in the air and in the arc extinguish chamber 21, and the diffusion and cooling effects of the electric arc in the air and in the arc extinguish chamber 21 are enhanced.

In addition, the embodiment of the application also provides a contactor, and the arc extinguishing system 2 comprises the contactor of any one of the above-mentioned embodiments.

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 particularly, features described in connection with the 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 rather to cover all embodiments falling within the scope of the appended claims.

Claims (15)

1. An arc extinguishing system of contactor, the contactor includes electromagnetic system and contact system, electromagnetic system includes the drive axis, the contact system includes static contact and moving contact, the moving contact with the drive axis is connected, the static contact is located the centraxonial both sides of drive and with the detachable contact of moving contact, its characterized in that, the arc extinguishing system includes:

the arc extinguish chamber is arranged on the outer peripheral side of a relative movement area of the moving contact and the fixed contact;

the arc striking device is used for leading out an arc root of an electric arc generated by separating the moving contact from the fixed contact from the contact system;

the transfer device is positioned on the outer peripheral sides of the arc extinguish chamber and the arc striking device and comprises a pair of permanent magnets which are symmetrically arranged by taking the driving central shaft as a center and have different polarities, and a magnetic field generated between the pair of permanent magnets covers the motion path of the electric arc so that the electric arc is transferred to the arc extinguish chamber through the arc striking device under the action of the magnetic field.

2. The arc extinguishing system according to claim 1, wherein an orthographic projection of the movable contact in a first plane extends along a first direction, the orthographic projection of the arc extinguishing chamber in the first plane is located on two sides of the orthographic projection of the driving center axis in the first plane along a second direction, the arc striking device leads out an arc root of the arc along the first plane, the first plane is parallel to a contact plane of the movable contact and the fixed contact, the first direction is a connecting line direction of the orthographic projection of the fixed contact and the driving center axis in the first plane, and the first direction intersects with the second direction.

3. The arc extinguishing system according to claim 2, wherein the arc striking device comprises a first arc striking member, the first arc striking member extends from one end of the movable contact, which is in contact with the fixed contact, toward the arc extinguishing chamber, and an included angle θ between an extending direction of the first arc striking member and the first direction in the first plane has a value range of: theta is more than or equal to 60 degrees and less than or equal to 75 degrees.

4. The arc extinguishing system according to claim 3, wherein the movable contact includes a first end and a second end opposite to each other in the first direction, and a third end and a fourth end opposite to each other in the second direction, and the first arc striking member is bent from an end surface of the third end or an end surface of the fourth end to a direction away from the fixed contact.

5. The arc extinguishing system according to claim 3, wherein the arc extinguishing chamber comprises a plurality of grids stacked in a direction perpendicular to the first plane, and the first arc striking member is equipotentially connected to the grids on a side far away from the fixed contact.

6. The arc extinguishing system according to any one of claims 3 to 5, wherein the arc striking device further comprises a second arc striking piece, the second arc striking piece is located on one side of the arc extinguishing chamber close to the fixed contact and is stacked with the arc extinguishing chamber, and the second arc striking piece is in equipotential connection with the fixed contact or keeps a predetermined gap.

7. The arc extinguishing system according to claim 6, wherein the second arc striking element comprises a second body portion and a second bending portion, the second body portion is stacked with the arc extinguishing chamber, and the second bending portion extends from the second body portion towards the fixed contact and abuts against the fixed contact to achieve equipotential connection.

8. The arc extinguishing system according to claim 7, wherein the arc extinguishing chamber includes a plurality of grids stacked in a direction perpendicular to the first plane, each of the grids including a first body portion disposed parallel to the first direction in the first plane and a first bent portion extending from one end of the first body portion toward the first arc striking member;

an inwards-concave arc ignition groove is formed in the first bending part, and a symmetrical center line of the first arc ignition piece in the extending direction points to the arc ignition groove.

9. The arc extinguishing system of claim 8, wherein a dimension of the second body portion in the first direction is smaller than a dimension of the first body portion in the first direction;

alternatively, a dimension of the second body portion in the second direction is smaller than a dimension of the first body portion in the second direction.

10. The arc extinguishing system of claim 8, wherein the first body of the grid away from the stationary contact among the plurality of grids has a smaller dimension in the first direction than the first bodies of the remaining grids;

or the size of the first body part of the grid sheet far away from one side of the static contact along the second direction is smaller than the size of the first body parts of the rest grid sheets along the second direction.

11. The arc extinguishing system according to claim 6, wherein the second arc striking member includes a second body portion and a second curved portion, the second body portion is stacked with the arc extinguishing chamber, the second curved portion extends from the second body portion toward the stationary contact, and a predetermined gap is maintained between the second curved portion and the stationary contact.

12. An arc extinguishing system according to claim 11, further comprising an arc-separating chamber for housing the arc extinguishing chamber and the contact system, the transfer device being located at an outer peripheral side of the arc-separating chamber, and an arc-separating wall located between the arc extinguishing chamber and the arc-separating chamber.

13. The arc extinguishing system according to claim 11, wherein the arc striking device further comprises an arc striking plate, the arc extinguishing chamber comprises a plurality of grid pieces stacked in a direction perpendicular to the first plane, the arc striking plate is connected with the grid pieces on a side of the arc extinguishing chamber away from the fixed contact, and the first arc striking piece is equipotentially connected with the arc striking plate when the first arc striking piece is away from the end of a stroke of the fixed contact.

14. The arc extinguishing system of claim 1, wherein the permanent magnet is an arc-shaped structure having a central angle greater than or equal to 90 °.

15. A contactor, comprising:

an arc extinguishing system of a contactor according to any of claims 1-14.

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