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

Abstract

The application provides an arc extinguishing system of a contactor and a contactor. The contactor includes an electromagnetic system and a contact system. The electromagnetic system includes a driving center shaft. The contact system includes a static contact and a moving contact. Shaft connection, the arc extinguishing system includes: an arc extinguishing chamber, which is arranged on the outer peripheral side of the relative movement area of the moving contact and the static contact; the arc starting device, at least one of the moving contact and the static contact One end corresponding to the arc chamber is equipotentially connected, and the arc starting device is used to lead out the arc root of the arc generated by the separation of the moving contact and the static contact from the contact system; the transfer device is located on the outer peripheral side of the arc extinguishing chamber and the arc starting device , the transfer device includes a pair of permanent magnets arranged symmetrically around the driving axis and with different polarities, and the magnetic field generated between the pair of permanent magnets covers the moving path of the arc. The arc extinguishing system can quickly transfer the arc from the movable contact to the arc extinguishing chamber, shorten the arc extinguishing time, and improve the reliability of the contactor.

Description

Arc extinguishing system of contactor and contactor

technical field

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

Background technique

The contactor is an electrical control component. In the field of new energy applications, such as electric vehicles, high-voltage DC contactors are usually used to connect and disconnect the power battery system, and can disconnect the high-voltage battery system when an accident occurs. It uses a small current An "automatic switch" that controls the operation of large currents, and plays the role of automatic adjustment, safety protection, and conversion circuits in the electrical system.

Arcing is a discharge phenomenon generated by the gas between the contacts under the action of a strong electric field. When breaking the circuit in the atmosphere, if the power supply voltage exceeds 12V ~ 20V, the broken current exceeds 0.25A ~ 1A, an arc will be generated in the gap between the contacts, and the arc will reduce the service life of the contactor and reduce the working efficiency. reliability, and may even cause accidents.

Contents of the invention

An embodiment of the present application provides an arc extinguishing system for a contactor, and the arc extinguishing system can improve the arc extinguishing effect.

In the first aspect, an embodiment of the present application provides an arc extinguishing system for a contactor. The electromagnetic system includes a driving center shaft. The contact system includes a static contact and a moving contact. The moving contact is connected to the driving center shaft. The static contact Located on both sides of the drive center shaft and in detachable contact with the moving contact, the arc extinguishing system includes: an arc extinguishing chamber, which is arranged on the outer peripheral side of the relative movement area between the moving contact and the static contact; At least one of the static contacts is equipotentially connected to one end of the arc extinguishing chamber through the arc striking device, and the arc striking device is used to lead out the arc root of the arc generated by the separation of the moving contact and the static contact from the contact system; The transfer device is located on the outer peripheral side of the arc extinguishing chamber and the arc strike device. The transfer device includes a pair of permanent magnets arranged symmetrically around the drive axis and with different polarities. The magnetic field generated between the pair of permanent magnets covers the movement of the arc. Path, so that the arc is transferred to the arc extinguishing chamber through the arc striking device under the action of the magnetic field.

According to any of the foregoing embodiments of the present application, the orthographic projection of the moving contact in the first plane extends along the first direction, and the orthographic projection of the arc extinguishing chamber in the first plane is located along the On both sides of the second direction, the arc starting device leads the arc root of the arc along the first plane, wherein the first plane is parallel to the contact plane between the moving contact and the static contact, and the first direction is the center axis between the static contact and the drive. In the connection direction of the orthographic projection in the first plane, the first direction intersects with the second direction.

According to any one of the above-mentioned embodiments of the present application, the arc starting device includes a first arc starting part, the first arc starting part extends from the end of the moving contact in contact with the static contact toward the arc extinguishing chamber, and in the first plane, the second arc starting part The value range of the included angle θ between the extension direction of an arc starting member and the first direction is: 60°≤θ≤75°.

According to any one of the foregoing embodiments of the present application, the movable contact includes a first end and a second end opposite along the first direction, and a third end and a fourth end opposite along the second direction, and the first arc starting member is formed by the first end. The end face of the third end or the end face of the fourth end is bent in a direction away from the fixed contact.

According to any one of the foregoing embodiments of the present application, the arc extinguishing chamber includes a plurality of grids stacked in a direction perpendicular to the first plane, and the first arc starting member is equipotentially connected to the grids on the side away from the static contact.

According to any one of the above-mentioned embodiments of the present application, the arc starting device further includes a second arc starting part, which is located on the side of the arc extinguishing chamber close to the static contact, and is stacked with the arc extinguishing chamber, and the second arc starting part Equipotential connection with static contacts or maintain a predetermined gap setting.

According to any one of the foregoing embodiments of the present application, the second arc starting member 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 static contact And butt to the static contact to realize the equipotential connection.

According to any one of the foregoing embodiments of the present application, the arc extinguishing chamber includes a plurality of grid sheets stacked along a direction perpendicular to the first plane, each grid sheet includes a first body portion and a first curved portion, and in the first plane, The first body part is arranged parallel to the first direction, and the first bending part extends from one end of the first body part toward the first arc starting part; an inwardly recessed arc starting groove is arranged on the first bending part, and the first arc starting part The center line of symmetry in the direction of extension points to the arc groove.

According to any of the foregoing embodiments of the present application, the size of the second body portion along the first direction is smaller than the size of the first body portion along the first direction; or, the size of the second body portion along the second direction is smaller than the size of the first body portion along the first direction. Dimensions in two directions.

According to any one of the aforementioned embodiments of the present application, among the plurality of grid pieces, the dimension of the first body portion of the grid piece on the side away from the fixed contact along the first direction is smaller than the dimensions of the first body portions of the remaining grid pieces along the first direction or, the dimension along the second direction of the first body portion of the grid piece on the side away from the fixed contact is smaller than the size of the first body portion of the other grid pieces along the second direction.

According to any one of the foregoing embodiments of the present application, the second arc starting member 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 static contact ; A predetermined gap is maintained between the second bending portion and the static contact.

According to any one of the above-mentioned embodiments of the present application, it also includes an arc-breaking chamber and an arc-breaking wall, the arc-breaking chamber is used to accommodate the arc-breaking chamber and the contact system, the transfer device is located on the outer peripheral side of the arc-breaking chamber, and the arc-breaking wall is located Between the arc extinguishing chamber and the arc isolation chamber.

According to any one of the aforementioned embodiments of the present application, the arc striking device further includes an arc striking plate, the arc extinguishing chamber includes a plurality of grids stacked along a direction perpendicular to the first plane, and the arc striking plate and the arc extinguishing chamber are separated by a distance from the static contact. The grid on the side is connected, and the first arc starting member is equipotentially connected to the arc starting plate when it is away from the end of the stroke of the static contact.

According to any one of the foregoing 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 the second aspect, the embodiment of the present application further provides a contactor, including the arc extinguishing system of the contactor as described above.

The arc extinguishing system of the contactor provided by the embodiment of the present application includes an arc extinguishing chamber, an arc striking device and a transfer device. The device generates a magnetic field covering the moving path of the arc, and transfers the arc to the arc extinguishing chamber for arc extinguishing, wherein at least one of the moving contact and the static contact is equipotentially connected to the arc extinguishing chamber through the arc striking device, and the arc can be The arc root is quickly transferred from one end of the contact system to the arc extinguishing chamber, which shortens the arc extinguishing time, speeds up the arc extinguishing process, and improves the reliability of the contactor.

Description of drawings

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

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

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

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;

FIG. 4 shows a schematic diagram of a partial structure of an arc extinguishing system according to an embodiment of the present application;

Fig. 5 shows a schematic diagram of the position of the arc root in the arc extinguishing system shown in Fig. 4;

Fig. 6 shows a top view of the arc extinguishing system shown in Fig. 5;

Fig. 7 shows a schematic structural diagram of another second arc striker in the arc extinguishing system shown in Fig. 4;

Fig. 8 shows a schematic diagram of the position of the arc root in the arc extinguishing system shown in Fig. 7;

Fig. 9 shows a schematic structural diagram of another arc extinguishing chamber in the arc extinguishing system shown in Fig. 7;

Fig. 10 shows a schematic structural diagram of an arc extinguishing chamber in the arc extinguishing system shown in Fig. 4;

Fig. 11 shows a schematic structural diagram of another second arc striker in the arc extinguishing system shown in Fig. 4;

Fig. 12 shows a schematic diagram of a partial structure of an arc extinguishing system according to another embodiment of the present application;

Fig. 13 shows a schematic diagram of the position of the arc root in the arc extinguishing system shown in Fig. 12;

Fig. 14 shows a schematic structural diagram of the arc extinguishing chamber of the arc extinguishing system shown in Fig. 12;

Fig. 15 shows a schematic diagram of the assembly structure of the arc partition wall and the arc extinguishing chamber in the arc extinguishing system shown in Fig. 12;

Fig. 16 shows a schematic diagram of the assembly structure of the arc partition and the arc extinguishing chamber in Fig. 15;

Fig. 17 shows a schematic structural view of the arc partition in Fig. 16;

Fig. 18 shows a schematic diagram of a partial structure of an arc extinguishing system according to another embodiment of the present application;

Fig. 19 shows a schematic structural view of the arc striker and the contact system in the arc extinguishing system shown in Fig. 18;

FIG. 20 shows a schematic structural diagram of the arc strike plate in FIG. 19 .

Reference signs:

1. Contact system;

11. Static contact; 12. Moving contact; 121. First end; 122. Third end;

2. Arc extinguishing system;

21. Arc extinguishing chamber; 211. Grid piece; 212. First body part; 213. First bending part; 214. Arc striking groove;

22. Arc starting device; 221. First arc starting piece; 222. Second arc starting piece; 223. Second body part; 224. Second bending part; 225. Lead wire; 226. Arc starting plate; 227. Middle part ; 228, end;

23. Transfer device; 231. Permanent magnet;

24. Arc partition wall; 241. Base body; 242. Avoidance groove;

25. Arc isolation chamber;

3. Electromagnetic system;

31. Drive axis; 32. Static iron core; 33. Moving iron core; 34. Coil; 35. Metal cup; 36. Yoke iron;

4. Shell;

A. Static contact arc root; B. Moving contact arc root;

X, the first direction;

Y, the second direction.

Detailed ways

The implementation manner of the present application will be further described in detail below with reference to the drawings and embodiments. The detailed description and drawings of the following embodiments are used to illustrate the principles of the application, but not to limit the scope of the application, that is, the application is not limited to the described embodiments.

In the description of this application, it should be noted that, unless otherwise specified, the meaning of "plurality" is more than two; the terms "upper", "lower", "left", "right", "inner", " The orientation or positional relationship indicated by "outside" and so on are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a reference to this application. Application Restrictions. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

The orientation words appearing in the following description are the directions shown in the figure, and do not limit the specific structure of the application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. Disassembled connection, or integral connection; it can be directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

Contactors include DC contactors and AC contactors. DC contactors refer to a contactor used in a DC circuit and are mainly used to control a DC circuit (main circuit, control circuit and excitation circuit, etc.). Since the attracting coil of the DC contactor is connected with DC, there is no impact starting current, and there will be no violent impact of the iron core. Compared with the AC contactor, the service life is longer, and it is suitable for frequent start-stop occasions.

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, an electromagnetic system 3 and a contact system 1 located in the housing 4, the electromagnetic system 3 includes a drive center shaft 31, a static iron core 32, a moving iron core 33, a coil 34, a metal Cup 35 and yoke 36. The contact system 1 includes a static contact 11 and a moving contact 12 , the moving contact 12 is connected to the driving shaft 31 , the static contact 11 is located on both sides of the driving shaft 31 and is in detachable contact with the moving contact 12 . Optionally, there are two fixed contacts 11 , which are arranged on opposite sides of the central drive shaft 31 , and the two fixed contacts 11 can be in detachable contact with the movable contact 12 respectively. The exterior of the electromagnetic system 3 is completely covered by a metal cup 35, which mainly assumes the role of a magnetic yoke, and its large-area metal outer surface assists arc cooling. The metal cup 35 adopts magnetically conductive metal materials, such as electrician pure iron, and the outer surface is electroplated. The central drive shaft 31 is made of insulating material to realize electrical isolation between the moving contact 12 and the moving iron core 33 .

When the coil 34 of the contactor is energized, the current in the coil 34 will generate a magnetic field, and the magnetic field will cause the static iron core 32 to generate electromagnetic attraction to attract the moving iron core 33, so that the moving contact 12 of the contactor will act simultaneously with it, thereby making the moving contact The head 12 is closed with the static contact 11 . When the coil of the contactor is de-energized, the electromagnetic attraction force disappears, and the moving contact 12 is disconnected from the static contact 11 . However, when the coil 34 is powered off, the output circuit has a high voltage and a large current, so that an arc is generated between the moving contact 12 and the static contact 11. The generation of the arc will delay the breaking of the circuit, and the higher arc energy will even cause Burning the moving contact 12 and the static contact 11 will cause the moving contact 12 and the static contact 11 to melt and weld, and in severe cases, dangers such as fire and explosion will 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 to quickly extinguish the arc between the contacts when the circuit is disconnected, so as to improve the reliability of the contactor.

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

Referring to FIG. 2 , the embodiment of the present application provides an arc extinguishing system 2 for a contactor, including an arc extinguishing chamber 21 , an arc striking device 22 and a transfer device 23 . The arc extinguishing system 2 can be used for DC contactors, and can also be used for AC contactors. For ease of description, the embodiment of the present application uses a DC contactor as an example for description.

The arc extinguishing chamber 21 is arranged on the outer peripheral side of the relative movement area of the moving contact 12 and the stationary contact 11 . Optionally, there are two arc extinguishing chambers 21 , and the two arc extinguishing chambers 21 are relatively arranged on the outer peripheral side of the relative movement area between the moving contact 12 and the stationary contact 11 .

At least one of the moving contact 12 and the static contact 11 is equipotentially connected to one end corresponding to the arc extinguishing chamber 21 through the arc starting device 22, and the arc starting device 22 is used to separate the moving contact 12 from the static contact 11 to generate The arc root of the arc is drawn from the contact system 1. Wherein, the arc root is the part where the moving contact 12 and the static contact 11 respectively contact the arc, that is, the end of the arc.

The transfer device 23 is located on the outer peripheral side of the arc extinguishing chamber 21 and the arc strike device 22, and the transfer device 23 includes a pair of permanent magnets 231 symmetrically arranged around the driving axis 31 and having different polarities, and a pair of permanent magnets 231 generate The magnetic field 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 Figure 3, take the first plane parallel to the contact plane of the movable contact 12 and the static contact 11 as the horizontal plane, and take the first plane where the connecting line between the two static contacts 11 passing through the drive center shaft 31 is located. One direction is the X axis, and the second direction perpendicular to the X axis is the Y axis to establish a Cartesian coordinate system. The two arc extinguishing chambers 21 are located on the outer peripheral side of the relative movement area between the movable contact 12 and the static contact 11, that is, in the top view plane shown in FIG. On both sides, and the two arc extinguishing chambers 21 and the moving contact 12 do not overlap each other. Optionally, the two arc extinguishing chambers 21 may be arranged symmetrically with respect to the origin center of the Cartesian coordinate system. A pair of permanent magnets 231 are arranged on the outer peripheral side of the arc extinguishing chamber 21, one of the permanent magnets 231 is N pole on the side facing the arc extinguishing chamber 21, and the other permanent magnet 231 is S pole on the side facing the arc extinguishing chamber 21. A magnetic field directed from the N pole to the S pole is generated between them. The dotted line in FIG. 3 shows the directions of multiple magnetic flux lines in the magnetic field generated by the transfer device 23, and the multiple magnetic flux directions cover each quadrant of the coordinate system. It should be noted that the outer peripheral side mentioned in this embodiment is not limited to the outer side of a specific circumferential structure, as long as one is located outside the other, and the orthographic projections of the two in the first plane do not intersect each other. Just stack.

Assuming that as shown in Figure 3, the static contact 11 on the side of the negative semi-axis of the X-axis is connected to the positive pole, and the static contact 11 on the side of the positive semi-axis of the X-axis is connected to the negative pole, then the direction of the return current of the contactor is from the negative pole of the X-axis. The static contact 11 on the half axis side flows to the movable contact 12, and then flows from the movable contact 12 to the static contact 11 on the positive half axis side of the X-axis. That is, the direction of the arc between the static contact 11 and the moving contact 12 on the left in Fig. 3 is to penetrate the contact plane, while the direction of the arc between the static contact 11 and the moving contact 12 on the right is to penetrate from the contact plane. out. According to Fleming's left-hand rule, the arc generated by the separation of the moving contact 12 from the static contact 11 is pulled away from the space between the moving contact 12 and the static contact 11 under the action of the Lorentz force F, and passes through the arc striking device. 22 transfers the arc clockwise to the arc extinguishing chamber 21, and rapidly cools the arc through the arc extinguishing chamber 21 to achieve the arc extinguishing effect.

Further, at least one of the moving contact 12 and the static contact 11 is equipotentially connected to one end corresponding to the arc extinguishing chamber 21 through the arc striking device 22, that is, the moving contact 12 corresponds to the arc extinguishing chamber 21 through the arc striking device 22 One end of the contact system 1 is equipotentially connected, or the static contact 11 is equipotentially connected to the corresponding end of the arc extinguishing chamber 21 through the arc striking device 22, so that the root of the arc can be quickly transferred from at least one end of the contact system 1 to the arc extinguishing chamber. Chamber 21 shortens the arc extinguishing time, speeds up the arc extinguishing process, and improves the reliability of the contactor.

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

In addition, in the embodiment of the present application, the arc extinguishing chamber 21 is arranged on the outer peripheral side of the relative movement area between the movable contact 12 and the static 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. The root of the arc is led out from the contact system 1 along the first plane. Compared with the technical solution in which the arc extinguishing chamber 21 is arranged in the moving direction of the moving contact 12, the internal space of the contactor can be utilized to the maximum extent. The length dimension of the contactor in the moving direction of the movable contact 12 is reduced to make the overall structure of the contactor more compact.

The arc extinguishing system 2 of the contactor provided by the embodiment of the present application includes an arc extinguishing chamber 21, an arc striking device 22 and a transfer device 23, and the arc striking device 22 separates the moving contact 12 from the static contact 11 to generate the arc root of the arc Leading from the contact system 1 , the transfer device 23 generates a magnetic field covering the moving path of the arc, and transfers the arc to the arc extinguishing chamber 21 for arc extinguishing. Wherein, at least one of the moving contact 12 and the static contact 11 is equipotentially connected to the arc extinguishing chamber 21 through the arc striking device 22, so that the root of the arc can be quickly transferred from at least one end of the contact system 1 to the arc extinguishing chamber 21. Shorten the arc extinguishing time, speed up the arc extinguishing process, and improve the reliability of the contactor.

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

In some embodiments, the orthographic projection of the moving contact 12 in the first plane parallel to the contact plane between the moving contact 12 and the static contact 11 extends along the first direction X, and the arc extinguishing chamber 21 in the first plane The orthographic projection is located on both sides of the orthographic projection of the driving axis 31 in the first plane along the second direction Y, and the arc striking device 22 draws the root of the arc along the first plane, wherein the first plane is parallel to the movable contact 12 In the contact plane with the static contact 11 , the first direction X is the connection direction of the orthographic projection of the static contact 11 and the driving axis 31 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. Wherein, the contact plane is the plane where the side of the movable contact 12 close to the static contact 11 is located when the movable contact 12 is in contact with the static contact 11 .

Specifically, in the first plane, the arc extinguishing chamber 21 is located on both sides of the first direction X, while the movable contact 12 extends along the first direction X, that is, the relative position between the two arc extinguishing chambers 21 is the same as that of the moving contact. The extension directions of the heads 12 are not on the same straight line. This arrangement reduces the length of the contactor in the first direction X, making the overall structure of the contactor more compact. Optionally, the orthographic projection of the movable contact 12 on the first plane is a rectangular structure, the long side of the rectangular structure extends along the first direction X, and the wide side extends along the second direction Y.

As mentioned above, the arc generated by the separation of the moving contact 12 and the static contact 11 is moved by the Lorentz force under the action of the magnetic field, and is deflected towards the arc extinguishing chamber 21 under the guidance of the arc striking device 22, so that the arc Transfer from the contact system 1 to the interrupter 21. In order to prevent the arc from being deflected to the inner wall of the housing 4 or other directions and damage the contactor, it is necessary to set the magnetic field direction of the transfer device 23 and the arc striking direction of the arc striking device 22 so that the arc is deflected to the arc extinguishing chamber 21 along a preset path.

As shown in Figure 3, the direction of the line connecting the center of the fixed contact 11 and the driving axis 31 is the X-axis direction, and the maximum magnetic induction line B in the magnetic field generated by the two permanent magnets 231 passes through the origin of the Cartesian coordinate system , and coincide with the center line between the two permanent magnets 231. Normally, the maximum magnetic induction line B is the densest place in the center of the magnetic field, and the Lorentz force F experienced by the arc at the position of the maximum magnetic induction line B is the largest, that is, the magnetic field at this position has the greatest 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 angle between the maximum magnetic induction line B and the X-axis.

In some embodiments, in the first plane parallel to the contact plane between the movable contact 12 and the fixed contact 11 , the direction of the maximum magnetic field line between the pair of permanent magnets 231 is the same as that between the fixed contact 11 and the driving axis 31 The value range of the included angle α between the first direction X where the line connecting the centers of the two centers is located is: 15°≤α≤30°. The applicant has found in practice that when the included angle α satisfies the above conditions, most of the arcs can be deflected to the arc chamber in a predetermined direction.

It should be noted that the first plane can be any plane parallel to the contact plane, and the first plane is only used to illustrate the working principle of the arc extinguishing system 2 and the arrangement of the corresponding parts according to the projection relationship, rather than the corresponding The distribution of magnetic induction lines and components of the arc extinguishing system 2 are considered to exist only on this plane, and this application will not describe it too much.

In some embodiments, the permanent magnet 231 is an arc structure, and the central angle of the permanent magnet 231 is greater than or equal to 90°. As shown in Figure 3, two permanent magnets 231 are arranged around the outer side of the movable contact 12 and the arc extinguishing chamber 21 to form a semi-enclosed structure, the magnetic field is formed in the space surrounded by a pair of permanent magnets 231, and the coverage area of the magnetic field is the same as The curvature of the permanent magnet 231 is positively correlated, that is, the larger the curvature of the permanent magnet 231, the larger the area covered by the magnetic field. Optionally, the permanent magnet 231 is an arc tile-shaped sheet structure, and the raw material is NdFeB or ferrite.

By setting the central angle of the permanent magnet 231 to be greater than or equal to 90°, while ensuring that the entire contact system 1 is located within the magnetic field coverage, most of the arc extinguishing chambers 21 are also located within the magnetic field coverage, thereby ensuring the magnetic field Completely cover the motion path of the arc. In addition, since the pair of permanent magnets 231 are arc-shaped, the magnetic field is more concentrated in the arc extinguishing system 2, and has a magnetic field density that is concavely distributed toward the center, so that the permanent magnets 231 act on the arc extinguishing system with a size as small as possible. system, and let more magnetic field lines act on the arc's motion path.

Fig. 4 shows a schematic diagram of a partial structure of an arc extinguishing system according to an embodiment of the present application, Fig. 5 shows a schematic diagram of the location of the arc root in the arc extinguishing system shown in Fig. Top view of the arc extinguishing system.

As shown in FIGS. 4 and 5 , in some embodiments, the arc starting device includes a first arc starting member 221 , and the first arc starting member 221 extends toward the arc extinguishing chamber 21 from the end of the moving contact 12 in contact with the static contact 11 . Optionally, there are two first arc-starting pieces 221 , and the two first arc-starting pieces 221 are arranged on opposite sides of the movable contact 12 . Thus, the first arc starting member 221 can deflect the arc generated at one end of the movable contact 12 to the arc extinguishing chamber 21 under the action of the magnetic field, thereby reducing the burning of the movable contact 12 and the static contact 11 at the breaking position.

As mentioned above, the arc at one end of the movable contact 12 is deflected to the arc extinguishing chamber 21 through the first arc starting member 221. When the extension direction of the first arc starting member 221 is consistent with the direction of the Lorentz force F, the arc will Deflection according to the preset path, and the direction of the Lorentz force F is perpendicular to the direction of the magnetic field lines there, and the first arc striker 221 is roughly located in the middle of a pair of permanent magnets 231, so the magnetic field is at the first arc strike The direction of the magnetic induction line at the corresponding position of the part 221 is nearly parallel to the direction of the maximum magnetic induction line B, so the direction of the Lorentz force F received by the first arc starting part 221 is the same as the Lorentz force F received by the maximum magnetic induction line B. The direction of the force F is almost the same. The value range of the angle α between the direction of the maximum magnetic induction line B between the pair of permanent magnets 231 and the first direction X where the center line of the fixed contact 11 and the drive center axis 31 is located When 15°≤α≤30°, the included angles θ and α between the extension direction of the first arc-leading member 221 toward the arc extinguishing chamber 21 and the first direction X are complementary angles to each other.

Therefore, in the first plane parallel to the contact plane between the movable contact 12 and the fixed contact 11, the extending direction of the first arc-leading member 221 is located at the first point where the line connecting the centers of the fixed contact 11 and the drive center shaft 31 is located. The value range of the angle θ between the directions X is: 60°≤θ≤75°. Wherein, the included angle θ of the first arc-starting member 221 is the arc-starting angle of the movable contact 12 . In this way, both the direction of the first arc starting member 221 and the Lorentz force F there point to the arc extinguishing chamber 21 , and the arc guiding effect of the arc starting 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 the first direction X along the line connecting the center of the fixed contact 11 and the center of the drive shaft 31 , and along the The third end 122 and the fourth end opposite to the second direction Y perpendicular to the first direction X, the first arc starting member 221 is bent away from the fixed contact 11 from the end face of the third end 122 or the end face of the fourth end . With such an arrangement, the arc at one end of the movable contact 12 can be introduced into the arc extinguishing chamber 21 through a shorter path, thereby speeding up the arc striking process.

Please continue to refer to FIG. 4 , in some embodiments, the arc extinguishing chamber 21 includes a plurality of grids 211 stacked in a direction perpendicular to the contact plane or the first plane, and the first arc starting member 221 is away from the fixed contact 11 . The grid sheet 211 on the side is equipotentially connected. With such an arrangement, the arc root B of the arc can be quickly transferred to the grid plate 211 on the side of the arc extinguishing chamber 21 away from the static contact 11, so as to prevent the arc root B of the arc from staying at the end of the moving contact 12 for a long time and prevent the moving The welding of the contact 12 is beneficial to improve the service life of the movable contact 12 .

Optionally, an equipotential connection is realized between the first arc starting member 221 and the grid piece 211 on the side away from the fixed contact 11 through a wire 225 . The wire 225 can be designed as a ring-wound multi-turn wire, and the length is automatically adjusted according to the distance between the moving contact 12 and the static contact 11 to prevent the moving contact 12 from breaking the wire 225 during movement. The wire 225 can also be a straight wire that meets the travel requirement of the movable contact 12 , as long as it does not affect the movement of the movable contact 12 .

In some embodiments, the arc starting device 22 further includes a second arc starting member 222, the second arc starting member 222 is located on the side of the arc extinguishing chamber 21 close to the static contact 11, and is stacked with the arc extinguishing chamber 21. The arc starting member 222 is equipotentially connected to the static contact 11 . Thus, the arc root A of the arc at one end of the static contact 11 can be quickly transferred to the second arc starting member 222 .

Further, the second arc starting 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, and the second bending portion 224 is directed from the second body portion 223 to the static contact 11 extends and abuts against the static contact 11 to realize equipotential connection. Wherein, the first curved portion 213 (see FIG. 7 ) and the second curved portion 224 are located on the same side of the arc extinguishing chamber 21 .

Optionally, the second curved portion 224 has a curved surface that matches the outer contour of the static contact 11 , and the curved surface abuts against the static contact 11 to achieve equipotential connection, so that the arc root A at one end of the static contact 11 is uniform. Transfer to the second arc striker 222 to prevent the arc root A of the arc from staying at one end of the static contact 11 for a long time, prevent the static contact 11 from welding, and improve the service life of the static contact 11 .

Thus, the moving contact 12 is equipotentially connected to the grid sheet 211 on the side of the arc extinguishing chamber 21 away from the static contact 11 through the first arc-leading member 221, and the static contact 11 is connected to the arc-extinguishing chamber through the second arc-leading member 222. The side of 21 close to the static contact 11 is equipotentially connected. When the movable contact 12 of the contactor is disconnected from the stationary contact 11, the movable contact 12 moves away from the stationary contact 11, and an arc is generated between the two. 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 drawn out from the contact system 1 at the same time, and transferred to the air to be elongated and broken. Quickly extinguish to ensure the safety of the circuit of the contactor. The arc extinguishing system 2 in this embodiment is mainly suitable for small current contactors. In order to further improve the arc extinguishing effect, the arc root position can be changed to elongate the arc so as to guide the arc to the arc extinguishing chamber 21 for arc extinguishing.

FIG. 7 shows a schematic structural diagram of another second arc starting member in the arc extinguishing system shown in FIG. 4 , and FIG. 8 shows a schematic diagram of a position of an arc root 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 FIG. The size of the body portion 212 along the first direction X. Optionally, the size of the second body portion 223 along the first direction X is half of the size of the first body portion 212 along the first direction X. Referring to FIG. Wherein, the dimension of the second body portion 223 along the first direction X is the length dimension of the second arc-leading member 222 .

In this way, the arc root A position of the arc at one end of the static contact 11 is transferred to the end of the second body portion 223 along the second curved portion 224 of the second arc starting member 222, while the arc root B position of the arc at one end of the moving contact 12 Keeping it unchanged, the arc between the moving contact 12 and the static contact 11 can be elongated, thereby adjusting the cutting position of the arc in the arc extinguishing chamber 21 .

FIG. 9 shows a schematic structural diagram of another arc extinguishing chamber 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 extinguishing chamber 21 , the size of the first body portion 212 of the grid 211 on the side away from the fixed contact 11 along the first direction X is smaller than that of the other grids 211 . The size of the first body portion 212 of the grid sheet 211 along the first direction X. Further optionally, the dimension along the first direction X of the first body portion 212 of the grid piece 211 away from the fixed contact 11 is half the size of the first body portion 212 of the other grid pieces 211 along the first direction X. Wherein, the dimension along the first direction X of the first body portion 212 of the grid piece 211 on the side away from the fixed contact 11 is the length dimension of the grid piece 211 .

In this way, the position of arc root B of the arc at one end of the movable contact 12 changes at the end of the length corresponding to the grid sheet 211, while the position of the arc root A of the arc at one end of the static contact 11 remains unchanged or changes, which can be adjusted Cutting position of the arc in the arc extinguishing chamber 21 .

Therefore, in this embodiment, when the moving contact 12 is equipotentially connected to the grid piece 211 on the side of the arc extinguishing chamber 21 away from the static contact 11 through the first arc-leading member 221, and the static contact 11 is connected through the second arc-leading member. When the arc part 222 is equipotentially connected to the side of the arc extinguishing chamber 21 close to the static contact 11, the position of the arc root A at one end of the static contact 11 along the length direction of the second arc starting part 222 can be adjusted, or the dynamic The position of the arc root B at one end of the contact 12 in the lengthwise direction of the grid sheet 211 of the arc extinguishing chamber 21, or the position of the arc root of the two are adjusted at the same time to elongate the arc and change the cut after the arc is transferred to the arc extinguishing chamber 21 position, enhance the diffusion and cooling effect of the arc in the arc extinguishing chamber 21, shorten the arc extinguishing time, and improve the reliability of the contactor.

FIG. 10 shows a schematic structural 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 extinguishing chamber 25 for accommodating the arc extinguishing chamber 21 and the contact system 1 , and the transfer device 23 is located on the outer peripheral side of the arc extinguishing chamber 25 . The arc extinguishing chamber 21 and the contact system 1 are accommodated in the arc extinguishing chamber 25, and the magnetic field generated by a pair of permanent magnets 231 of the transfer device 23 acts on the arc extinguishing chamber 25 and provides a Lorentz force F to move the arc, so as to The arc is deflected into the arc extinguishing chamber 21 . The presence of the arc chamber 25 can separate the permanent magnet 231 from the arc extinguishing chamber 21 to prevent the magnetic properties of the permanent magnet 231 from deteriorating, thereby maintaining the magnetism of the permanent magnet 231 for a long time and making the arc disappear quickly and reliably.

Further, in order to prevent the arc from burning out the arc extinguishing chamber 25 , it can be realized by changing the arc root position of the arc on the second arc starting member 222 and the grid 211 of the arc extinguishing chamber 21 .

FIG. 11 shows a schematic structural diagram of another second arc striker in the arc extinguishing system shown in FIG. 4 .

In some embodiments, as shown in FIG. 11 , the size of the second body portion 223 of the second arc starting member 222 along the second direction Y is smaller than that of the first body portion 212 of the grid 211 of the arc extinguishing chamber 21 along the second direction. Y-dimension. Optionally, the size of the second body part 223 along the second direction Y is half of the size of the first body part 212 along 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 leading member 222 .

In this way, the position of the arc root A of the arc at one end of the static contact 11 is shortened by the second body portion 223 of the original second arc-leading member 222 along the radial direction of the arc-interruption chamber 25, thereby preventing the arc from burning out the arc-intervention chamber Room 25.

In some embodiments, among the plurality of grids 211 of the arc extinguishing chamber 21, the size of the first body portion 212 of the grid 211 on the side away from the fixed contact 11 along the second direction Y is smaller than the first body portion 212 of the remaining grids 211. The size of the body portion 212 along the second direction Y. Further optionally, the size of the first body portion 212 of the grid piece 211 away from the fixed contact 11 along the second direction Y is half of the size of the first body portion 212 of the other grid pieces 211 along the second direction Y. Wherein, the dimension along the second direction Y of the first body portion 212 of the grid piece 211 on the side away from the fixed contact 11 is the width dimension of the grid piece 211 .

Therefore, in this embodiment, when the moving contact 12 is equipotentially connected to the grid piece 211 on the side of the arc extinguishing chamber 21 away from the static contact 11 through the first arc-leading member 221, and the static contact 11 is connected through the second arc-leading member. When the arc piece 222 is equipotentially connected to the side of the arc extinguishing chamber 21 close to the static contact 11, the position of the arc root B of the arc at one end of the moving contact 12 on the grid piece 211 is along the radial direction of the arc extinguishing chamber 25 shorten, so as to prevent the arc from burning out the arc chamber 25 .

Fig. 12 shows a schematic diagram of a partial structure of an arc extinguishing system according to another embodiment of the present application, Fig. 13 shows a schematic diagram of the position of the arc root in the arc extinguishing system shown in Fig. Schematic diagram of the structure of the arc extinguishing chamber of the arc extinguishing system.

Please refer to Figure 12 and Figure 13, the embodiment of the present application also provides another arc extinguishing system, which is similar to the structure of the arc extinguishing system shown in Figure 2 to Figure 6, the difference is that the fixed contact 11 is the same as the first A predetermined gap is maintained between the two arc starting members 222 .

Specifically, the second arc starting 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, and the second bending portion 224 is directed from the second body portion 223 to the static contact. The head 11 extends, and a predetermined gap is maintained between the second curved portion 224 and the static contact 11 .

Thus, the arc root B of the arc at one end of the moving contact 12 is quickly transmitted to the grid sheet 211 on the side away from the static contact 11 of the arc extinguishing chamber 21 through the first arc starting member 221, and the arc at one end of the static contact 11 The arc root A is delayed for a period of time before being transmitted to the second arc starting member 222, so that the arc generated when the movable contact 12 is disconnected from the static contact 11 can be elongated, and the arc in the arc extinguishing chamber 21 is strengthened. diffusion and cooling effects.

The working principle of the arc extinguishing chamber of the arc extinguishing system of the embodiment of the present application will be described in detail below with reference to FIG. 14 .

As shown in FIG. 14 , among the multiple grids 211 of the arc extinguishing chamber 21 , each grid 211 includes a first body portion 212 and a first curved portion 213 . In the first plane of the plane, the first body part 212 is arranged parallel to the first direction X where the line connecting the center of the fixed contact 11 and the drive center shaft 31 is located, and the first bending part 213 is directed from one end of the first body part 212 to the first direction X. The arc starting member 221 extends. Optionally, the first curved portion 213 is provided with an inwardly recessed arc striking groove 214 , and the center line of symmetry of the first arc striking member 221 in the extension direction points to the arc striking groove 214 .

Optionally, the grid piece 211 is a plate-shaped structure, and the material can be copper, ferromagnetic, ceramics and other materials with magnetic permeability, so as to reduce the magnetic resistance of the arc extinguishing chamber 21, so that the magnetic force lines of the magnetic field at the edge side have a direction The tendency of the arc extinguishing chamber 21 to shrink, so that the path of the magnetic field lines of the magnetic field is bent, and these curved magnetic field lines help to deflect the moving direction of the arc to the arc extinguishing chamber 21, so as to make full use of the space of the arc extinguishing chamber 21 to cool the arc Extinguish, improve the internal space utilization of the contactor, and make the arc extinguishing effect stronger.

In addition, the first body portion 212 is integrally connected with the first bending portion 213 , and the arc strike 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-leading slot 214 faces the deflection direction of the first arc-leading member 221 of the movable contact 12 . Since the first arc starting piece 221 and the arc starting slot 214 are roughly located in the middle of a pair of permanent magnets 231, the direction of the magnetic field line at the corresponding position of the first arc starting piece 221 and the arc starting slot 214 is the same as the maximum magnetic induction. The direction of the line B is close to parallel, that is, the direction of the Lorentz force F received by the arc also points to the opening direction of the arc striking groove 214. into the arc extinguishing chamber 21.

Since the direction perpendicular to the contact plane is the return direction of the arc between the movable contact 12 and the static contact 11, a plurality of grids 211 are stacked along the direction perpendicular to the contact plane, and can be arranged according to the movement stroke of the movable contact 12. Make adjustments to keep the gap consistent. When the internal current of the contactor is greater than a certain value, the magnetic flux formed by the magnetic field passing through the arc slot 214 will magnetically drive the arc to the deep space of the arc slot 214, thereby turning the contact formed between the moving contact 12 and the static contact 11 The entire arc is cut into multiple short arcs to form a voltage drop and increase the initial dielectric strength of the arc gap to maintain the arc voltage rise. If the arc voltage is higher than the voltage of the contactor power supply, the arc is eliminated.

In addition, the arc extinguishing chamber 21 stores a gas atmosphere such as air, nitrogen or hydrogen, and it can be seen from the gas movement and heat conduction that the high temperature and high pressure gas always moves towards the low temperature and low pressure environment. As a result, the high-temperature and high-pressure gas generated by the elongated arc moves toward the outlet of the arc extinguishing chamber 21, and is cooled by the gas atmosphere after entering the arc extinguishing chamber 21. At the same time, the pressure gradient of the arc extinguishing system 2 drives the arcing gas to The flow in the arc chamber 21 circulates. In addition, the stacked grids 211 of the arc extinguishing chamber 21 not only increase the capacity of the arc extinguishing chamber 21, but also promote the internal circulation of the high-temperature arcing gas in the upper layer of the contactor, so that the arc extinguishing chamber 21 can be fully utilized. The inner space cools the high temperature gas and extinguishes the arc.

In this embodiment, the moving contact 12 is equipotentially connected to the grid piece 211 on the side of the arc extinguishing chamber 21 away from the static contact 11 through the first arc-leading member 221, for example, the first arc-leading member 221 is connected to the corresponding grid through a wire. The sheet 211 is electrically connected, and the fixed contact 11 and the second arc starting member 222 maintain a predetermined gap, so that the arc root A of the arc at one end of the static contact 11 is located at the front end of the second arc starting member 222, that is, the arc root A is located at the first arc starting member 222. The second bent portion 224 faces the side of the static contact 11 , which can elongate the arc generated when the movable contact 12 is disconnected from the static contact 11 , and enhance the diffusion and cooling effect of the arc in the arc extinguishing chamber 21 . The arc extinguishing system 2 is especially suitable for high-power DC contactors. Since the DC contactor does not have the process of voltage and current zero crossing, the instantaneous temperature of the arc is relatively high. By elongating the arc, the arc can be quickly cooled and the instantaneous high temperature of the arc can be avoided. The energy accumulated in the second arc starting member 222 has no time to diffuse and ablate the arc extinguishing chamber 21 .

Fig. 15 shows a schematic diagram of the assembly structure of the arc partition wall and the arc extinguishing chamber in the arc extinguishing system shown in Fig. 12, Fig. 16 shows a schematic diagram of the assembly structure of the arc partition wall and the arc extinguishing chamber in Fig. 15, and Fig. 17 shows The structural schematic diagram of the arc partition in Fig. 16 .

Referring to FIG. 15 to FIG. 17 , in some embodiments, the arc extinguishing system 2 further includes an arc isolation wall 24 , and the arc isolation wall 24 is located between the arc extinguishing chamber 21 and the arc isolation chamber 25 . Optionally, the arc barrier 24 includes a base body 241 and a plurality of avoidance grooves 242 arranged in parallel on the base body 241. The plurality of avoidance grooves 242 are arranged in one-to-one correspondence with the plurality of grid pieces 211 of the arc extinguishing chamber 21. The avoidance grooves 242 can accommodate the sides of the grid sheet 211 .

When the moving contact 12 is equipotentially connected to the grid piece 211 on the side of the arc extinguishing chamber 21 away from the static contact 11 through the first arc-leading member 221, and the fixed contact 11 and the second arc-leading member 222 maintain a predetermined gap. , the arc generated when the moving contact 12 is disconnected from the static contact 11 can be elongated, and by setting the arc isolation wall 24 between the arc extinguishing chamber 21 and the arc isolation chamber 25, the elongated arc can be effectively avoided from burning out The arc isolation chamber 25 , thereby protecting the arc isolation chamber 25 .

Fig. 18 shows a schematic diagram of a partial structure of an arc extinguishing system according to another embodiment of the present application, Fig. 19 shows a schematic diagram of the structure of an arc striker and a contact system in the arc extinguishing system shown in Fig. 18 , and Fig. 20 shows a diagram Schematic diagram of the structure of the arc strike plate in 19.

Please refer to Figure 18 to Figure 20, the embodiment of the present application also provides another arc extinguishing system, which is similar in structure to the arc extinguishing system shown in Figure 12 to Figure 17, the difference is that the arc striking device 22 also includes The arc starting plate 226 is connected to the grid plate 211 on the side of the arc extinguishing chamber 21 away from the static contact 11, and the first arc starting member 221 is at the same potential as the arc starting plate 226 when it is far away from the end of the stroke of the static contact 11 connect.

In some embodiments, a predetermined gap is maintained between the second arc striker 222 of the arc striker 22 and the fixed contact 11, the arc strike plate 226 is connected to the adjacent grid piece 211 by a wire, and the first arc strike The element 221 is equipotentially connected to the arc striker 226 when it is away from the end of the stroke of the fixed contact 11 .

Thus, when the moving contact 12 moves away from the fixed contact 11 and abuts against the arc strike plate 226, the arc is introduced into the arc extinguishing chamber 21 through the arc strike plate 226, and the arc root B of the arc is drawn by the first arc strike plate 226. The arc part 221 is quickly transferred to the grid plate 211 on the side of the arc extinguishing chamber 21 away from the static contact 11, which can prevent the first arc starting part 221 from being continuously burned by the arc for a long time, so that the moving contact 12 and the static contact 11 can be connected many times. After breaking, the movable contact 12 always maintains a good arc striking angle, that is, the included angle θ of the first arc striking member 221 can remain unchanged for a long time. In addition, the arc at one end of the static contact 11 is delayed for a period of time before being transmitted to the second arc starting member 222, so that the arc generated when the movable contact 12 is disconnected from the static contact 11 can be elongated, and the arc is strengthened. Diffusion and cooling effect in the interrupter 21.

In addition, the arc starting plate 226 is generally S-shaped, including a middle portion 227 and two end portions 228 drawn from the middle portion 227 . Among them, the middle part 227 allows the drive center shaft 31 to pass through, the two arc extinguishing chambers 21 are respectively carried on the two ends 228 of the S-shaped arc leading plate 226, and the two first arc leading parts 221 of the moving contact 12 are respectively It can abut against the two end portions 228 of the arc strike plate 226 correspondingly. Of course, the arc starting plate 226 can also be in other shapes.

In some other embodiments, the second arc starting member 222 of the arc starting device 22 is equipotentially connected to the static contact 11, the arc starting plate 226 and the adjacent grid piece 211 maintain a predetermined gap, and the first arc starting member 221 is equipotentially connected to the arc striker 226 when it is away from the end of the stroke of the fixed contact 11 .

As a result, the movable contact 12 moves in a direction away from the fixed contact 11 and is connected to the arc strike plate 226 in equipotential connection when it reaches the end of the stroke. Equipotential connection between the second arc starting parts 222 . 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 starting part 222, while the arc root B at the end of the moving contact 12 is transferred to the extinguishing part after a period of delay. arc chamber 21. With such arrangement, the arc can be elongated both in the air and in the arc extinguishing chamber 21 , and the diffusion and cooling effects of the arc in the air and in the arc extinguishing chamber 21 are enhanced.

In addition, the embodiment of the present application also provides a contactor, including the arc extinguishing system 2 of the contactor in any one of the foregoing implementation manners.

While the present application has been described with reference to a preferred embodiment, various modifications may be made thereto and equivalents may be substituted for parts thereof without departing from the scope of the present application, in particular, as long as there are no structural conflicts , the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (15)

1. An arc extinguishing system for a contactor, the contactor includes an electromagnetic system and a contact system, the electromagnetic system includes a drive axis, the contact system includes a static contact and a moving contact, and the moving contact The head is connected to the driving central shaft, the static contacts are located on both sides of the driving central shaft and are in detachable contact with the moving contact, it is characterized in that the arc extinguishing system includes: The arc extinguishing chamber is arranged on the outer peripheral side of the relative movement area between the moving contact and the static contact; An arc starting device, at least one of the moving contact and the static contact is equipotentially connected to one end corresponding to the arc extinguishing chamber through the arc starting device, and the arc starting device is used to connect the The root of the arc generated by the separation of the moving contact from the static contact is drawn out from the contact system; The transfer device is located on the outer peripheral side of the arc extinguishing chamber and the arc striking device, and the transfer device includes a pair of permanent magnets arranged symmetrically around the driving central axis and having different polarities. The magnetic field generated between the magnets covers the movement path of the arc, so that the arc is transferred to the arc extinguishing chamber through the arc striking device under the action of the magnetic field. 2. The arc extinguishing system according to claim 1, wherein the orthographic projection of the moving contact in the first plane extends along the first direction, and the orthographic projection of the arc extinguishing chamber in the first plane The projections are located on both sides of the orthographic projection of the driving central axis in the first plane along the second direction, and the arc striking device draws the root of the arc along the first plane, wherein the first A plane is parallel to the contact plane between the moving contact and the static contact, and the first direction is the connection direction of the orthographic projection of the static contact and the driving central axis in the first plane , the first direction intersects the second direction. 3. The arc extinguishing system according to claim 2, wherein the arc starting device comprises a first arc starting member, and the first arc starting member is contacted by the moving contact with the static contact One end of one end extends towards the arc extinguishing chamber, and in the first plane, the value range of the included angle θ between the extension direction of the first arc starting member and the first direction is: 60°≤ θ≤75°. 4. The arc extinguishing system according to claim 3, wherein the movable contact comprises a first end and a second end opposite along the first direction, and a third end opposite along the second direction. end and the fourth end, the first arc starter is bent from the end face of the third end or the end face of the fourth end in 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 along a direction perpendicular to the first plane, and the first arc starting member is separated from the The grids on one side of the static contact are equipotentially connected. 6. The arc extinguishing system according to any one of claims 3 to 5, wherein the arc starting device further comprises a second arc starting part, the second arc starting part is located in the arc extinguishing chamber close to the One side of the static contact, and is stacked with the arc extinguishing chamber, and the second arc starting member is equipotentially connected to the static contact or maintains a predetermined gap. 7. The arc extinguishing system according to claim 6, wherein the second arc starting member comprises a second body part and a second bending part, and the second body part is stacked with the arc extinguishing chamber, The second bending portion extends from the second body portion toward the static contact and abuts against the static contact to realize equipotential connection. 8. The arc extinguishing system according to claim 7, wherein the arc extinguishing chamber comprises a plurality of grids stacked in a direction perpendicular to the first plane, each of the grids comprising a first The main body part and the first curved part, in the first plane, the first main body part is arranged parallel to the first direction, and the first curved part is directed from one end of the first main body part to the first an arc starter extension; The first curved portion is provided with an inwardly recessed arc starting slot, and the symmetrical centerline of the first arc starting member in the extending direction points to the arc starting slot. 9. The arc extinguishing system according to claim 8, wherein the dimension of the second body portion along the first direction is smaller than the dimension of the first body portion along the first direction; Alternatively, the size of the second body portion along the second direction is smaller than the size of the first body portion along the second direction. 10. The arc extinguishing system according to claim 8, characterized in that, among the plurality of grids, the first body portion of the grid on the side away from the fixed contact is along the first The size of the direction is smaller than the size of the first body portion of the other grid sheets along the first direction; Or, the size of the first body portion of the grid piece on the side away from the fixed contact along the second direction is smaller than the size of the first body portion of the other grid pieces along the second direction. size. 11. The arc extinguishing system according to claim 6, wherein the second arc starting member comprises a second body part and a second bending part, and the second body part is stacked with the arc extinguishing chamber, The second bent portion extends from the second body portion toward the fixed contact, and a predetermined gap is maintained between the second bent portion and the fixed contact. 12. The arc extinguishing system according to claim 11, further comprising an arc extinguishing chamber and an arc extinguishing wall, the arc extinguishing chamber is used for accommodating the arc extinguishing chamber and the contact system, so The transfer device is located on the outer peripheral side of the arc-breaking chamber, and the arc-breaking wall is located between the arc-extinguishing chamber and the arc-breaking chamber. 13. The arc extinguishing system according to claim 11, wherein the arc striking device further comprises an arc striking plate, and the arc extinguishing chamber comprises a plurality of grids stacked in a direction perpendicular to the first plane. The arc starting plate is connected to the grid on the side of the arc extinguishing chamber away from the fixed contact, and the first arc starting member is connected to the starting arc when it is away from the end of the stroke of the fixed contact. Arc plate equipotential bonding. 14. The arc extinguishing system according to claim 1, wherein the permanent magnet is in an arc structure, and the central angle of the permanent magnet is greater than or equal to 90°. 15. A contactor, characterized in that it comprises: The arc extinguishing system of the contactor according to any one of claims 1-14.

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