Contactor contact arc extinguishing system and contactor

Abstract

This application provides a contactor arc-extinguishing system and a contactor. The contact arc-extinguishing system includes a contact system, an arc-extinguishing system, and a cooling ring. The contact system includes a stationary contact and a moving contact, which are separably in contact along a first direction and capable of generating an electric arc upon separation. The arc-extinguishing system includes a first arc-extinguishing chamber and a second arc-extinguishing chamber located on both sides of the contact system, and the arc-extinguishing system extinguishes the electric arc through the first and second arc-extinguishing chambers. The cooling ring is a ring-shaped structure with a hollow portion, in which the arc-extinguishing system is disposed. The cooling ring surrounds at least a portion of the moving contact's movement path to cool the electric arc. The cooling ring provided by this application can effectively cool the electric arc and high-temperature gas, accelerate the extinguishing of the arc, and improve the breaking capacity of the contact arc-extinguishing system.

Description

Technical Field

[0001] This application relates to the field of contactor technology, and in particular to a contactor contact arc extinguishing system and a contactor. Background Technology

[0002] A 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. They can also disconnect the high-voltage battery system in case of an accident. It is an "automatic switch" that uses a small current to control a large current. In electrical systems, it plays a role in automatic adjustment, safety protection, and circuit switching.

[0003] An electric arc is a discharge phenomenon that occurs between contacts when gas is exposed to a strong electric field. When breaking a circuit in the atmosphere, if the power supply voltage exceeds 12V to 20V and the interrupted current exceeds 0.25A to 1A, an electric arc will be generated in the gap between the contacts. The electric arc will reduce the service life of the contactor, decrease its reliability, and may even cause an accident. Summary of the Invention

[0004] This application provides a contact arc extinguishing system and a contactor, which can improve the arc extinguishing effect.

[0005] In a first aspect, embodiments of this application provide a contactor arc-extinguishing system, including a contact system, an arc-extinguishing system, and a cooling ring. The contact system includes a stationary contact and a moving contact, which are separably in contact along a first direction and capable of generating an electric arc upon separation. The arc-extinguishing system includes a first arc-extinguishing chamber and a second arc-extinguishing chamber located on both sides of the contact system, and extinguishes the electric arc through the first and second arc-extinguishing chambers. The cooling ring is a ring-shaped structure with a hollow portion, and the arc-extinguishing system is disposed in the hollow portion. The cooling ring surrounds at least a portion of the moving contact's movement path to cool the electric arc.

[0006] In some embodiments, the stationary contact includes a first surface forming the root of an electric arc, the first surface being located in the hollow portion, and a cooling ring surrounding the movement path of the moving contact.

[0007] In some embodiments, the cooling ring is made of ceramic material.

[0008] In some embodiments, there are two stationary contacts, and the moving contacts include a first end and a second end disposed opposite to each other along a second direction. The two stationary contacts correspond one-to-one with the first end and the second end and are in separable contact. The cooling ring includes an inner surface forming a hollow portion and a cooling portion. The cooling portion protrudes relative to the inner surface and is disposed in the region of the cooling ring adjacent to the first end and / or the second end. The cooling ring cools the electric arc through the cooling portion.

[0009] In some embodiments, in the first end and / or the second end and the corresponding cooling portion thereon, the projection of the cooling portion along the second direction onto the first plane at least partially covers the projection of the movement path of the first end or the second end along the second direction onto the first plane, wherein the first plane is perpendicular to the second direction.

[0010] In some embodiments, the moving contact further includes two extensions, which are connected one-to-one with the first end and the second end. One extension extends from the first end to the first arc-extinguishing chamber, and the other extension extends from the second end to the second arc-extinguishing chamber, so as to introduce an electric arc into the first arc-extinguishing chamber and the second arc-extinguishing chamber. In the adjacent cooling section and extension, the projection of the cooling section along the second direction onto the first plane at least partially covers the projection of the movement path of the extension along the second direction onto the first plane.

[0011] In some embodiments, the cooling portion is a plurality of protrusions spaced apart on the inner surface.

[0012] In some embodiments, the protrusions are elongated structures; a plurality of protrusions are spaced apart along the circumferential direction of the cooling ring, and the length direction of the protrusions is parallel to or inclined relative to the first direction; or, a plurality of protrusions are spaced apart along the first direction, and the length direction of the protrusions is parallel to or inclined relative to the circumferential direction of the cooling ring, wherein the circumferential direction of the cooling ring is perpendicular to the first direction.

[0013] In some embodiments, the cooling portion is a ridge threaded around the inner surface in a first direction.

[0014] Secondly, embodiments of this application provide a contactor including the aforementioned contact arc extinguishing system.

[0015] The arc-extinguishing system of this embodiment is disposed in the hollow part of the cooling ring. The cooling ring surrounds at least part of the movement path of the moving contact. The electric arc and high-temperature gas generated between the stationary and moving contacts enter the arc-extinguishing system through the cooling ring. The electric arc and high-temperature gas in contact with the cooling ring are fully cooled by the cooling ring, and then enter the first and second arc-extinguishing chambers. The first and second arc-extinguishing chambers cut the electric arc into multiple short arcs. The grid and the cooling ring further enhance the cooling and surface recombination of the short arcs and high-temperature gas, so that the high-temperature gas is cooled rapidly and the electric arc disappears quickly. Therefore, the cooling ring provided by this embodiment can fully cool the electric arc and high-temperature gas, accelerate the disappearance of the electric arc, and improve the breaking capacity of the contact arc-extinguishing system. Attached Figure Description

[0016] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0017] Figure 1 This is a cross-sectional view of a contactor according to an embodiment of this application;

[0018] Figure 2 yes Figure 1 Another cross-sectional view of the contactor shown;

[0019] Figure 3 This is a partial structural diagram of a contactor according to an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of a contact arc extinguishing system according to an embodiment of this application;

[0021] Figure 5 This is another partial structural schematic diagram of the contact arc extinguishing system according to an embodiment of this application;

[0022] Figure 6 yes Figure 4 The diagram shows the structure of the cooling ring in the contact arc extinguishing system.

[0023] Figure 7 yes Figure 4 The diagram shown is a structural schematic of the contact system in the arc extinguishing system.

[0024] Figure 8 yes Figure 7 A schematic diagram of the moving contact of the contact system shown in another angle;

[0025] Figure 9 This is a schematic diagram of the structure of the grid plate of the first arc-extinguishing chamber in the contact arc-extinguishing system of this application embodiment;

[0026] Figure 10 This is a schematic diagram of the structure of the arc-quenching plate of the first arc-quenching chamber in the contact arc-quenching system of this application embodiment;

[0027] Figure 11 yes Figure 1 The diagram shows a structural schematic of a cooling ring in the contactor's contact arc-extinguishing system.

[0028] Figure 12 yes Figure 1 The diagram shows another structural schematic of the cooling ring in the contactor's arc-extinguishing system.

[0029] Figure 13 This is a schematic diagram of the magnetic field distribution generated by the transfer device of the contact arc extinguishing system according to an embodiment of this application.

[0030] Figure label:

[0031] 1. Contact system;

[0032] 11. Stationary contact; 111. First surface; 12. Moving contact; 121. First end; 122. Second end; 123. Extension;

[0033] 2. Arc extinguishing system; 21. First arc extinguishing chamber; 22. Second arc extinguishing chamber; 23. First permanent magnet; 24. Second permanent magnet; 25. Grid plate; 251. Second recess; 252. Groove; 26. Arc ignition plate; 261. First recess;

[0034] 3. Electromagnetic system;

[0035] 31. Drive shaft; 32. Stationary iron core; 33. Moving iron core; 34. Coil; 35. Metal cup; 36. Yoke;

[0036] 4. Shell;

[0037] 5. Cooling ring;

[0038] 51. Hollow section; 52. Inner surface; 53. Cooling section; 531. Protrusion;

[0039] X, the first direction; Y, the second direction. Detailed Implementation

[0040] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0041] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] Figure 1 This is a cross-sectional view of a contactor according to an embodiment of this application. Figure 2 yes Figure 1 Another cross-sectional view of the contactor shown. Figure 3 This is a partial structural diagram of a contactor according to an embodiment of this application.

[0044] Please see Figures 1 to 3 The contactor includes a housing 4 and an electromagnetic system 3, an arc-extinguishing system 2, and a contact system 1 located within the housing 4. The electromagnetic system 3 includes a drive shaft 31, a stationary iron core 32, a moving iron core 33, a coil 34, a metal cup 35, and a yoke 36. The contact system 1 includes a stationary contact 11 and a moving contact 12. The moving contact 12 is connected to the drive shaft 31, and the stationary contacts 11 are located on both sides of the drive shaft 31 and are in separable contact with the moving contact 12. Optionally, there are two stationary contacts 11, which are arranged opposite each other on both sides of the drive shaft 31, and each of the two stationary contacts 11 can be separably contacted with the moving contact 12. The arc-extinguishing system 2 is located on both sides of the moving contact 12 and is used to extinguish the electric arc.

[0045] The electromagnetic system 3 is completely enclosed by a metal cup 35, which primarily functions as a magnetic yoke, and its large metal surface assists in arc cooling. The metal cup 35 is made of a magnetically conductive metal material, such as electrical pure iron. The drive shaft 31 is made of insulating material to achieve electrical isolation between the moving contact 12 and the moving iron core 33.

[0046] When the contactor coil 34 is energized, the current within the coil 34 generates a magnetic field. This magnetic field causes the stationary iron core 32 to generate an electromagnetic attraction that draws the moving iron core 33, causing the moving contact 12 to move simultaneously, thus closing the contact between the moving contact 12 and the stationary contact 11. When the contactor coil is de-energized, the electromagnetic attraction disappears, and the moving contact 12 disconnects from the stationary contact 11. However, when the coil 34 is de-energized, the output circuit has a high voltage and a large current, causing an electric arc to form between the moving contact 12 and the stationary contact 11. This arc can be cut off and extinguished by the arc-extinguishing system 2.

[0047] However, the generation of an electric arc will delay the opening of the circuit. High arc energy may even burn the moving contact 12 and the stationary contact 11, causing the moving contact 12 and the stationary contact 11 to melt and weld together. In severe cases, it may cause dangers such as fire and explosion.

[0048] In view of this, embodiments of this application provide a contactor arc extinguishing system for quickly extinguishing the electric arc between contacts when the circuit is disconnected, thereby improving the reliability of the contactor.

[0049] Figure 4 This is a schematic diagram of a contact arc extinguishing system according to an embodiment of this application. Figure 5 This is a schematic diagram of another partial structure of the contact arc extinguishing system according to an embodiment of this application. Figure 6 yes Figure 4 The diagram shows the structure of the cooling ring in the contact arc extinguishing system.

[0050] Please see Figures 4-6This application provides a contactor arc-extinguishing system, which includes a contact system 1, an arc-extinguishing system 2, and a cooling ring 5. The contact system 1 includes a stationary contact 11 and a moving contact 12. The moving contact 12 and the stationary contact 11 are separably in contact along a first direction X and can generate an electric arc upon separation. The arc-extinguishing system 2 includes a first arc-extinguishing chamber 21 and a second arc-extinguishing chamber 22 located on both sides of the contact system 1. The arc-extinguishing system 2 extinguishes the electric arc through the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22. The cooling ring 5 is an annular structure with a hollow portion 51. The arc-extinguishing system 2 is disposed in the hollow portion 51, and the cooling ring 5 surrounds at least a portion of the movement path of the moving contact 12 to cool the electric arc.

[0051] The cooling ring 5 surrounds at least a portion of the movement path of the moving contact 12, meaning that the cooling ring 5 surrounds the outer periphery of the movement path of the moving contact 12, and at least a portion of the movement path of the moving contact 12 is surrounded within the cooling ring 5.

[0052] In this embodiment, the movement path of the moving contact 12 refers to the entire movement path of the moving contact 12, and does not refer to the movement path of a single point within it. That is, the movement path of the moving contact 12 includes the first position where the moving contact 12 contacts the stationary contact 11 and the second position where the moving contact 12 is furthest from the stationary contact 11. The space traversed by the moving contact 12 from the first position to the second position constitutes the movement path of the moving contact 12. Optionally, the axial direction of the cooling ring 5 is parallel to the movement direction of the moving contact 12.

[0053] It should be noted that the arc extinguishing system 2 is located in the hollow part 51, which may be entirely located in the hollow part 51 or partially located in the hollow part 51.

[0054] Optionally, the cooling ring 5 is a circular ring structure. Further, the cooling ring 5 is a concentric circular ring structure. The drive shaft 31 is located at the axis of the cooling ring 5.

[0055] Of course, the cooling ring 5 can also be other ring-shaped structures, such as elliptical ring-shaped structures, which are not limited in this application.

[0056] In some alternative embodiments, the cooling ring 5 is made of ceramic. Of course, it can also be made of other materials that have cooling capabilities and are insulating.

[0057] The hollow part 51 of the cooling ring 5 refers to the hollow space enclosed by the ring-shaped structure.

[0058] The first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 in this embodiment of the application each include a plurality of grid plates, which are stacked along the first direction X. The electric arc generated between one of the two stationary contacts 11 and the moving contact 12 enters the first arc-extinguishing chamber 21, and the electric arc generated between the other stationary contact 11 and the moving contact 12 enters the second arc-extinguishing chamber 22.

[0059] Optionally, the grid material can be cold-rolled steel plate, copper plate, Nomex profile or ceramic, etc.

[0060] The arc-extinguishing system 2 is disposed in the hollow portion 51 of the cooling ring 5. The cooling ring 5 surrounds at least part of the movement path of the moving contact 12. The electric arc and high-temperature gas generated between the stationary contact 11 and the moving contact 12 enter the arc-extinguishing system 2 through the cooling ring 5. The electric arc and high-temperature gas in contact with the cooling ring 5 are fully cooled by the cooling ring 5, and then enter the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22. The first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 cut the electric arc into multiple short arcs. The grid plate and the cooling ring 5 further enhance the cooling and surface recombination of the short arcs and high-temperature gas, so that the high-temperature gas is cooled quickly and the electric arc disappears rapidly. Therefore, the cooling ring 5 provided in this embodiment can fully cool the electric arc and high-temperature gas, accelerate the disappearance of the electric arc, and improve the breaking capacity of the contact arc-extinguishing system 2.

[0061] In some alternative embodiments, the stationary contact 11 includes a first surface 111 forming the root of an electric arc, the first surface 111 being located in the hollow portion 51, and the cooling ring 5 surrounding the movement path of the moving contact 12.

[0062] An electric arc is generated between the first surface 111 and the moving contact 12. The cooling ring 5 surrounds the entire movement path of the moving contact 12, and the first surface 111 of the stationary contact 11 is located in the hollow part 51. In this way, the cooling ring 5 can cover most of the path when the electric arc is generated between the stationary contact 11 and the moving contact 12 (i.e., the path along the first direction X of the arc), as well as most of the path from the generation position to the arc extinguishing system 2. The increased volume of the cooling ring 5 also increases the contact area with the electric arc, so the cooling effect is more significant and the arc disappears more quickly.

[0063] Optionally, the cooling ring 5 includes a first end 121 and a second end 122 opposite to each other in the first direction X. The first end 121 abuts against the housing 4, and the second end 122 abuts against the stationary iron core 32. The outer peripheral surface of the cooling ring 5 abuts against the inner peripheral surface of the housing 4.

[0064] In some alternative embodiments, there are two stationary contacts 11, and the moving contact 12 includes a first end 121 and a second end 122 disposed opposite to each other along the second direction Y. The two stationary contacts 11 correspond one-to-one with the first end 121 and the second end 122 and are in separable contact. The cooling ring 5 includes an inner surface 52 forming a hollow portion 51 and a cooling portion 53. The cooling portion 53 protrudes relative to the inner surface 52 and is disposed in the region of the cooling ring 5 adjacent to the first end 121 and / or the second end 122. The cooling ring 5 cools the electric arc through the cooling portion 53.

[0065] Optionally, there are two cooling sections 53, with each cooling section 53 corresponding to the first end 121 and the second end 122.

[0066] The first end 121 and the second end 122 are the locations where the electric arc is generated. The cooling part 53 is adjacent to the first end 121 and / or the second end 122. Therefore, the cooling part 53 is closer to the electric arc than the inner surface 52, and can cool part of the electric arc that cannot reach the inner surface 52, increasing the contact area with the electric arc and improving the cooling effect. Moreover, being closer to the first end 121 and the second end 122 allows for faster cooling of the electric arc, increasing the cooling rate.

[0067] In some embodiments, in the first end 121 and / or the second end 122 and the corresponding cooling portion 53, the projection of the cooling portion 53 along the second direction Y onto the first plane at least partially covers the projection of the movement path of the first end 121 or the second end 122 along the second direction Y onto the first plane, wherein the first plane is perpendicular to the second direction Y.

[0068] The movement paths of the first end 121 and the second end 122 in this embodiment refer to the movement paths of the entire first end 121 and the entire second end 122, that is, the space traversed by the first end 121 and the second end 122 is the movement path of the first end 121 and the second end 122.

[0069] The projection of the cooling section 53 along the second direction Y onto the first plane at least partially covers the projection of the movement path of the first end 121 or the second end 122 along the second direction Y onto the first plane. In this way, the cooling section 53 is arranged opposite to the first end 121 or the second end 122 along the second direction. The cooling section 53 is located in the cooling ring 5 at the position closest to the first end 121 or the second end 122, and therefore is closest to the electric arc, which significantly improves the cooling effect and cooling rate.

[0070] Optionally, the projection of the cooling section 53 along the second direction Y onto the first plane completely covers the projection of the movement path of the first end 121 or the second end 122 along the second direction Y onto the first plane. Further optionally, there are two cooling sections 53, each corresponding one-to-one with the first end 121 and the second end 122, respectively, and opposite to the first end 121 and the second end 122 along the second direction Y. The projections of the two cooling sections 53 along the second direction Y onto the first plane completely cover the projections of the movement paths of the first end 121 and the second end 122 along the second direction Y onto the first plane.

[0071] Please continue to refer to Figure 4In some optional embodiments, the moving contact 12 further includes two extensions 123, which are connected one-to-one with the first end 121 and the second end 122. One extension 123 extends from the first end 121 toward the first arc-extinguishing chamber 21, and the other extension 123 extends from the second end 122 toward the second arc-extinguishing chamber 22, so as to introduce an electric arc into the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22. In the adjacent cooling section 53 and extension 123, the projection of the cooling section 53 along the second direction Y onto the first plane at least partially covers the projection of the movement path of the extension 123 along the second direction Y onto the first plane.

[0072] The movement path of the extension 123 in this embodiment refers to the movement path of the entire extension 123, and does not refer to the movement path of a certain point. That is, the space traversed by the extension 123 is the movement path of the extension 123.

[0073] After a portion of the arc is generated between the stationary contact 11 and the moving contact 12, the arc on the moving contact 12 passes through the extension 123 and enters the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22. This increases the extension length of the cooling section 53 towards the arc-extinguishing system 2, so that the cooling section 53 at least partially covers the projection of the movement path of the extension 123 along the second direction Y onto the first plane. In other words, it increases the contact area between the arc portion and the cooling section 53 during the movement through the extension 123, thereby improving the cooling effect of the cooling ring 5.

[0074] Optionally, in adjacent cooling sections 53 and extensions 123, the projection of the cooling section 53 along the second direction Y onto the first plane completely covers the projection of the movement path of the extension 123 along the second direction Y onto the first plane.

[0075] Figure 7 yes Figure 4 The diagram shown is a structural schematic of the contact system in the arc extinguishing system. Figure 8 yes Figure 7 The diagram shows the structure of the moving contact of the contact system at another angle.

[0076] Please see Figure 7 and Figure 8 In some optional embodiments, the angle α formed by the projection of the extension 123 along the first direction X onto the contact plane between the moving contact 12 and the stationary contact 11 and the second direction Y is in the range of 30°-70°. More optionally, the range of α is 65°-70°.

[0077] With the included angle set to 30°-70°, the arc-initiating angle of the moving contact 12 and the direction of the Lorentz force generated by the magnetic field at that location both point towards the corresponding arc-extinguishing chamber, resulting in better arc guiding effect of the moving contact 12. With the included angle set to 65°-70°, the extension 123 can guide the arc to the depths of the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22, ensuring full contact with the first and second arc-extinguishing chambers 21 and 22, and allowing for faster cutting.

[0078] In some alternative embodiments, one extension 123 bends from the first end 121 toward the side opposite to the stationary contact 11 and extends toward the first arc-extinguishing chamber 21; the other extension 123 bends from the second end 122 toward the side opposite to the stationary contact 11 and extends toward the second arc-extinguishing chamber 22. With this configuration, the moving contact 12 can introduce the arc into the first and second arc-extinguishing chambers 21 and 22 with a shorter movement path, thus accelerating the arc ignition process.

[0079] Figure 9 This is a schematic diagram of the structure of the grid plate of the first arc-extinguishing chamber in the contact arc-extinguishing system according to an embodiment of this application. Figure 10 This is a schematic diagram of the structure of the arc-starting plate of the first arc-extinguishing chamber in the contact arc-extinguishing system of this application embodiment.

[0080] Please see Figure 9 and Figure 10 The first arc-extinguishing chamber 21 includes a plurality of stacked grid plates 25 and an arc-inducing plate 26 located at one end of the plurality of grid plates 25. The arc-inducing plate 26 is stacked with the grid plates 25 and is used to transfer the arc root of the stationary contact 11 to itself. The end of the arc-inducing plate 26 that mates with the stationary contact 11 has a first recess 261. The first recess 261 is spaced apart from the outer periphery of the stationary contact 11, and the two are in concave-convex fit to introduce the arc into itself.

[0081] The grid plate 25 includes two opposite sides along the second direction Y, one side of which has a second recess 251. The extension 123 is able to engage with the second recess 251 and is spaced apart to introduce an electric arc into the second recess 251.

[0082] Alternatively, the second recess 251 is recessed inward to form a groove 252, which is used to elongate the electric arc.

[0083] Optionally, the materials of the grid plate 25 and the arc-starting plate 26 can be cold-rolled steel plate, copper plate, Nomex profile or ceramic, etc.

[0084] Please continue to refer to Figure 6 In some alternative embodiments, the cooling portion 53 is a plurality of protrusions 531 spaced apart on the inner surface 52.

[0085] The shape of the protrusion 531 is not limited in this embodiment; it can be a strip, a block, or an irregular shape.

[0086] The number of protrusions 531 in this embodiment is not limited, but there are at least two.

[0087] The multiple protrusions 531 spaced apart can cut the electric arc and accelerate its disappearance.

[0088] In some alternative embodiments, the number of protrusions 531 is one.

[0089] Figure 11 yes Figure 1 The diagram shows a structural schematic of a cooling ring in the contactor's arc-extinguishing system. Figure 12 yes Figure 1 The diagram shows another structural schematic of the cooling ring in the contactor's arc-extinguishing system.

[0090] Please see Figure 11 and Figure 12 In some optional embodiments, the protrusion 531 is an elongated structure; a plurality of protrusions 531 are spaced apart along the circumferential direction of the cooling ring 5, and the length direction of the protrusion 531 is parallel to the first direction X or inclined relative to the first direction X; or, a plurality of protrusions 531 are spaced apart along the first direction X, and the length direction of the protrusion 531 is parallel to the circumferential direction of the cooling ring 5 or inclined relative to the circumferential direction of the cooling ring 5, wherein the circumferential direction of the cooling ring 5 is perpendicular to the first direction X.

[0091] The embodiments of this application do not limit the specific shape of the elongated structure; it can be a straight elongated structure or a curved elongated structure.

[0092] When the electric arc is transferred from the stationary contact 11 and the moving contact 12 to the arc extinguishing system 2, the direction of the arc's movement is roughly along the circumferential direction of the cooling ring 5. Therefore, the protrusion 531 is set as a long strip, and its length direction is parallel to the first direction X, while the circumferential direction of the cooling ring 5 is perpendicular to the first direction X. In this way, the protrusion 531 can cut and cool the electric arc during the transfer process, accelerating the disappearance of the electric arc.

[0093] An electric arc is generated between the stationary contact 11 and the moving contact 12 and gradually elongates as the moving contact 12 moves. Therefore, when the arc is between the stationary contact 11 and the moving contact 12, it extends approximately along the first direction X. The length direction of the protrusion 531 is inclined relative to the first direction X, thus cutting and cooling the arc extending between the stationary contact 11 and the moving contact 12. As mentioned above, when the arc is transferred to the arc extinguishing system 2, the direction of arc movement is approximately perpendicular to the first direction X. Therefore, the multiple protrusions 531 inclined along the first direction X can not only cut and cool the arc extending between the stationary contact 11 and the moving contact 12, but also cut and cool the arc moving towards the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22.

[0094] Optionally, the protrusion 531 is a straight strip structure, with multiple protrusions 531 spaced apart along the circumferential direction of the cooling ring 5, and the length direction of the protrusion 531 is inclined relative to the first direction X, with the inclination angle ranging from 0° to 70°. Further, the angle between the protrusion 531 and the first direction X ranges from 10° to 60°. Still further, the angle between the protrusion 531 and the first direction X is 20°, 30°, 40°, 45°, or 50°.

[0095] When the angle between the protrusion 531 and the first direction X is 45°, it has a good cutting effect on the extension of the electric arc during its generation and during its transfer to the arc extinguishing system 2.

[0096] In some alternative embodiments, the protrusion 531 is an elongated structure, with multiple protrusions 531 spaced apart along the circumferential direction of the cooling ring 5, and the length direction of the protrusion 531 is parallel to or inclined relative to the first direction X. The cooling ring 5 includes a first end and a second end disposed opposite to each other along the first direction X, and the protrusion 531 extends from the first end to the second end. The circumferential direction of the cooling ring 5 is perpendicular to the first direction X.

[0097] This configuration maximizes the area of ​​the protrusion 531, increasing the contact area with the electric arc and improving cutting and cooling effects.

[0098] Alternatively, the number of protrusions 531 can be 3-6.

[0099] As mentioned above, the electric arc is generated between the stationary contact 11 and the moving contact 12 and gradually elongates as the moving contact 12 moves. Therefore, when the electric arc is between the stationary contact 11 and the moving contact 12, it extends approximately along the first direction X. The length direction of the protrusion 531 is parallel to the circumferential direction of the cooling ring 5, which can effectively cut and cool the electric arc between the stationary contact 11 and the moving contact 12, and accelerate the disappearance of the electric arc.

[0100] When the electric arc is transferred from the stationary contact 11 and the moving contact 12 to the arc extinguishing system 2, the direction of the arc's movement is approximately along the circumferential direction of the cooling ring 5. Therefore, the length direction of the protrusion 531 is inclined relative to the circumferential direction of the cooling ring 5, which can cut and cool the arc transferred to the arc extinguishing system 2. As mentioned above, when the arc is between the stationary contact 11 and the moving contact 12, it extends approximately along the first direction X. Multiple protrusions 531, which are spaced apart along the first direction X and whose length direction is inclined relative to the circumferential direction of the cooling ring 5, can not only cut and cool the arc transferred to the arc extinguishing system 2, but also cut and cool the arc between the stationary contact 11 and the moving contact 12.

[0101] In some alternative embodiments, the protrusions 531 are curved strip structures, with multiple protrusions 531 spaced apart along the first direction X, and the length direction of the protrusions 531 is inclined relative to the circumferential direction of the cooling ring 5, with the inclination angle ranging from 0° to 70°. Further optionally, the angle between the protrusions 531 and the first direction X ranges from 10° to 30°. Setting the angle to 10°-30° allows for the arrangement of more protrusions 531.

[0102] It should be noted that in the embodiments of this application, the length direction of the protrusion 531 is inclined relative to the circumferential direction of the cooling ring 5, which means that the protrusion 531 extends along the circumference of the cooling ring 5 and forms an angle with the circumferential direction of the cooling ring 5.

[0103] In some alternative embodiments, the protrusion 531 is a curved strip structure, and multiple protrusions 531 are spaced apart along the first direction X. The length direction of the protrusion 531 is parallel to the circumferential direction of the cooling ring 5 or inclined relative to the circumferential direction of the cooling ring 5, and each protrusion 531 forms a closed ring structure.

[0104] By setting the protrusion 531 as a closed ring structure, the contact area between the electric arc and the cooling part 53 is significantly increased, thereby improving the cooling effect of the cooling ring 5.

[0105] Optionally, the number of protrusions 531 forming a closed ring structure is 3-6.

[0106] In some embodiments, the cooling section 53 is a ridge threaded around the inner surface 52 of the cooling ring 5 in the first direction X.

[0107] The spiral ridges are inclined relative to the direction of the cooling ring 5, which has a cutting effect on the extension of the electric arc during its generation and during its transfer to the arc extinguishing system 2.

[0108] Please continue to refer to Figure 4In some optional embodiments, the arc extinguishing system 2 further includes a transfer device located on the outer periphery of the arc extinguishing system 2, and a cooling ring 5 located between the transfer device and the arc extinguishing system 2. The transfer device includes a first permanent magnet 23 and a second permanent magnet 24 with opposite polarities, and the arc is transferred to the arc extinguishing system 2 under the action of the magnetic fields generated by the first permanent magnet 23 and the second permanent magnet 24.

[0109] The magnetic field generated by the transfer device covers the movement path of the electric arc, so that the electric arc is transferred to the arc extinguishing system 2 under the action of the magnetic field.

[0110] Optionally, the angle α between the direction of the maximum magnetic field line B between the first permanent magnet 23 and the second permanent magnet 24 and the second direction Y is in the range of 20°≤α≤25°.

[0111] This configuration allows most of the electric arc to be deflected in a predetermined direction to the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22.

[0112] Figure 13 This is a schematic diagram of the magnetic field distribution generated by the transfer device of the contact arc extinguishing system according to an embodiment of this application.

[0113] like Figure 13 As shown, a rectangular coordinate system is established with the second plane parallel to the contact plane between the moving contact 12 and the stationary contact 11 as the horizontal plane, the second direction where the line connecting the two stationary contacts 11 passing through the drive shaft 31 is located as the A-axis, and the third direction perpendicular to the A-axis as the B-axis.

[0114] The first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 are located on the outer periphery of the area where the moving contact 12 and the stationary contact 11 move relative to each other, that is, in Figure 12 In the top view shown, the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 are located on both sides of the moving contact 12 along the B-axis. Optionally, the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 can be symmetrically arranged with respect to the origin of the rectangular coordinate system. The first permanent magnet 23 and the second permanent magnet 24 are disposed on the outer periphery of the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22. For example, the side of the first permanent magnet 23 facing the first arc-extinguishing chamber 21 is the S pole, and the side of the second permanent magnet 24 facing the second arc-extinguishing chamber 22 is the N pole, generating a magnetic field between them from the N pole to the S pole. Figure 12 The dashed lines in the middle indicate the directions of multiple magnetic field lines in the magnetic field generated by the transfer device, which cover each quadrant of the coordinate system.

[0115] Assumption Figure 12 As shown, the stationary contact 11 on the negative half-axis of the A-axis is connected to the positive terminal, and the stationary contact 11 on the positive half-axis of the A-axis is connected to the negative terminal. Therefore, the return current of the contactor flows from the stationary contact 11 on the negative half-axis of the A-axis to the moving contact 12, and then from the moving contact 12 back to the stationary contact 11 on the positive half-axis of the A-axis. That is... Figure 12 The current direction of the arc between the stationary contact 11 and the moving contact 12 on the left is to penetrate into the contact plane, while the current direction of the arc between the stationary contact 11 and the moving contact 12 on the right is to exit from the contact plane. According to Fleming's left-hand rule, the arc generated by the separation of the moving contact 12 and the stationary contact 11 is pulled away from the space between the moving contact 12 and the stationary contact 11 under the action of the Lorentz force F, and transferred in a clockwise direction to the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22. The arc is rapidly cooled by the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22, achieving the arc-extinguishing effect.

[0116] This application also provides a contactor including the above-described contact arc extinguishing system.

[0117] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A contactor contact arc quenching system characterized by, include: A contact system includes a stationary contact and a moving contact, wherein the moving contact and the stationary contact are separably contacted along a first direction and are capable of generating an electric arc upon separation; the number of stationary contacts is two; the moving contact includes a first end and a second end disposed opposite to each other along a second direction and two extensions connected to the first end and the second end in a one-to-one correspondence; the two stationary contacts are in separable contact with the first end and the second end in a one-to-one correspondence. An arc extinguishing system includes a first arc extinguishing chamber and a second arc extinguishing chamber located on both sides of the contact system, wherein the arc extinguishing system extinguishes the electric arc through the first arc extinguishing chamber and the second arc extinguishing chamber; A transfer device is located on the outer periphery of the arc extinguishing system, and the electric arc is transferred to the arc extinguishing system under the action of the magnetic field generated by the transfer device. A cooling ring is a ring-shaped structure with a hollow portion. The arc-extinguishing system is disposed in the hollow portion. The cooling ring is located between the transfer device and the arc-extinguishing system. The cooling ring surrounds at least a portion of the movement path of the moving contact to cool the electric arc. The cooling ring includes an inner surface forming the hollow portion and a cooling portion. The cooling portion protrudes relative to the inner surface and is disposed in the region of the cooling ring adjacent to the first end and / or the second end. The electric arc generated between the stationary contact and the moving contact enters the arc-extinguishing system via the cooling portion. The cooling ring cools the electric arc through the cooling portion. The cooling portion is a convex strip threaded around the inner surface in a first direction. One of the extensions extends from the first end toward the first arc-extinguishing chamber, and the other extension extends from the second end toward the second arc-extinguishing chamber, to introduce the arc into the first arc-extinguishing chamber and the second arc-extinguishing chamber. In adjacent cooling sections and extensions, the projection of the cooling section along the second direction onto the first plane at least partially covers the projection of the movement path of the extension along the second direction onto the first plane. Wherein, the first direction X is perpendicular to the second direction Y, and the first plane is perpendicular to the second direction Y.

2. The contactor contact arc extinction system of claim 1, wherein, The stationary contact includes a first surface forming the arc root, the first surface being located in the hollow portion, and a cooling ring surrounding the movement path of the moving contact.

3. The contactor contact arc extinction system of claim 1, wherein, The cooling ring is made of ceramic material.

4. The contactor contact arc extinction system of claim 1, wherein, In the first end and / or the second end and the corresponding cooling section thereto, the projection of the cooling section along the second direction onto the first plane at least partially covers the projection of the movement path of the first end or the second end along the second direction onto the first plane.

5. The contactor contact arc extinction system of claim 1, wherein, The cooling section consists of multiple protrusions spaced apart on the inner surface.

6. The contactor contact arc extinction system of claim 5, wherein, The protrusion has a long strip-shaped structure; The plurality of protrusions are spaced apart along the circumferential direction of the cooling ring, and the length direction of the protrusions is parallel to the first direction or inclined relative to the first direction; Alternatively, a plurality of the protrusions are spaced apart along the first direction, and the length direction of the protrusions is parallel to or inclined relative to the circumferential direction of the cooling ring, wherein the circumferential direction of the cooling ring is perpendicular to the first direction.

7. A contactor characterized by Including the contact arc extinguishing system as described in any one of claims 1-6.

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