Contact arc extinguishing system of contactor and contactor

Abstract

The present application provides a contact arc extinguishing system and a contactor for a contactor, wherein the contactor includes a driving central shaft, and the contact arc extinguishing system includes two static contacts, an arc extinguishing assembly, and a moving contact. The arc extinguishing assembly includes a first arc extinguishing chamber and a second arc extinguishing chamber arranged opposite to each other along a first direction. The moving contact is located between the first arc extinguishing chamber and the second arc extinguishing chamber, and the moving contact is in detachable contact with the two static contacts and can generate an arc when separated. The moving contact includes a contact body and two extensions, and the contact body is connected to the driving central shaft, wherein one extension extends from the contact body toward the first arc extinguishing chamber, and the other extension extends from the contact body toward the second arc extinguishing chamber. The projection of the extension along the first direction partially covers the corresponding arc extinguishing assembly, and the projection of at least one extension along the first direction covers the portion of the corresponding arc extinguishing assembly and is in detachable contact with the static contact. The contact arc extinguishing system provided by the present application can improve the arc extinguishing effect.

Description

Technical Field

[0001] The present application relates to the technical field of contactors, and in particular to a contact arc extinguishing system of a contactor and a contactor. Background Art

[0002] A contactor is an electrical control component. In the field of new energy applications, for example, electric vehicles usually use high-voltage DC contactors to connect and disconnect the power battery system. They can also disconnect the high-voltage battery system in the event of an accident. It is an "automatic switch" that uses a small current to control a large current operation. It plays the role of automatic adjustment, safety protection, and circuit conversion in the electrical system.

[0003] Arcing is a discharge phenomenon caused by the gas between contacts under the influence of a strong electric field. When interrupting a circuit in the atmosphere, if the power supply voltage exceeds 12V to 20V and the interrupted current exceeds 0.25A to 1A, an arc will be generated in the gap between the contacts. This arc can shorten the service life of the contactor, reduce its reliability, and even cause accidents. Summary of the Invention

[0004] An embodiment of the present application provides a contact arc extinguishing system for a contactor and a contactor, wherein the contact arc extinguishing system can improve arc extinguishing effect.

[0005] In a first aspect, an embodiment of the present application provides a contact arc extinguishing system for a contactor, wherein the contactor includes a drive shaft, and the contact arc extinguishing system includes two static contacts, an arc extinguishing assembly, and a moving contact. The arc extinguishing assembly includes a first arc extinguishing chamber and a second arc extinguishing chamber arranged relative to each other along a first direction. The moving contact is located between the first arc extinguishing chamber and the second arc extinguishing chamber, and the moving contact is in detachable contact with the two static contacts and can generate an arc when separated. The moving contact includes a contact body and two extensions, and the contact body is connected to the drive shaft, wherein one extension extends from the contact body toward the first arc extinguishing chamber, and the other extension extends from the contact body toward the second arc extinguishing chamber. The projection of the extension along the first direction partially covers the corresponding arc extinguishing assembly, and the projection of at least one extension along the first direction covers the portion of the corresponding arc extinguishing assembly that is in detachable contact with the static contact.

[0006] In some embodiments, the projection of the extension along the second direction partially covers the corresponding arc extinguishing assembly, and the portion of the projection of at least one extension along the second direction covering the corresponding arc extinguishing assembly is in detachable contact with the static contact, and the second direction is perpendicular to the first direction.

[0007] In some embodiments, the two extensions correspond to the two static contacts in a one-to-one manner and are in detachable contact with each other.

[0008] In some embodiments, the extension portion includes a first surface facing the static contact and a protrusion protruding from the first surface, and the extension portion is in detachable contact with the static contact via the protrusion.

[0009] In some embodiments, the contact body includes a second surface facing the stationary contact, and the first surface and the second surface are flush with each other.

[0010] In some embodiments, a cross section of the protrusion in the protruding direction is circular.

[0011] In some embodiments, the contact body includes a first end and a second end arranged opposite to each other along the second direction, and two extensions are connected to the first end and the second end one by one; the angle between the extension and the second direction is 30°≤θ≤80°, and the second direction is perpendicular to the first direction.

[0012] In some embodiments, a cooling ring is further included. The cooling ring is an annular structure with a hollow portion. The arc extinguishing assembly is arranged in the hollow portion. The cooling ring surrounds at least part of the moving path of the moving contact to cool the arc.

[0013] In some embodiments, the cooling ring includes an inner surface forming a hollow portion and a cooling portion, which is protruding relative to the inner surface and is arranged in an area of ​​the cooling ring adjacent to at least one of the two extension portions, and the cooling ring cools the arc through the cooling portion.

[0014] In some embodiments, in adjacent cooling portions and extension portions, a projection of the cooling portion along the arrangement direction of the two extension portions on the first plane at least partially covers a projection of the movement path of the extension portion along the arrangement direction of the two extension portions on the first plane.

[0015] In a second aspect, the present application also provides a contactor, comprising the above-mentioned contact arc extinguishing system.

[0016] The moving contact of the contact arc extinguishing system provided in the embodiment of the present application includes a contact body and two extensions. The two extensions are not only closer to the corresponding first arc extinguishing chamber and the second arc extinguishing chamber relative to the contact body, but the projection of the extension along the first direction covers the corresponding arc extinguishing assembly, and the part of the extension whose projection covers the corresponding arc extinguishing assembly is in detachable contact with the static contact. Therefore, the arc generated when the static contact is separated from the extension is not only close to the first arc extinguishing chamber and / or the second arc extinguishing chamber, but also opposite to the first arc extinguishing chamber and / or the second arc extinguishing chamber in the first direction. The arc can easily enter the first arc extinguishing chamber and / or the second arc extinguishing chamber, and the arc travel path is significantly shortened, thereby accelerating the arc extinguishing efficiency and improving the arc extinguishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0018] Figure 1 is a cross-sectional view of a contactor according to an embodiment of the present application;

[0019] Figure 2 is another cross-sectional view of the contactor according to an embodiment of the present application;

[0020] Figure 3 This is a partial structural diagram of a contactor according to an embodiment of the present application;

[0021] Figure 4 This is a structural diagram of a contact arc extinguishing system according to an embodiment of the present application;

[0022] Figure 5 yes Figure 4 A structural schematic diagram of a moving contact in a contact arc extinguishing system shown in FIG.

[0023] Figure 6 yes Figure 4 A schematic structural diagram of a grid of a first arc extinguishing chamber in a contact arc extinguishing system is shown;

[0024] Figure 7 yes Figure 4 A schematic diagram of a structure of a cooling ring in a contact arc extinguishing system is shown;

[0025] Figure 8 Schematic diagram of the distribution of the magnetic field generated by the transfer device of the contact arc extinguishing system of the embodiment of the present application.

[0026] Reference numerals:

[0027] 1. Contact system;

[0028] 11. Stationary contact; 12. Moving contact; 121. Contact body; 122. Extension portion; 123. First surface; 124. Protrusion; 125. Second surface; 126. First end portion; 127. Second end portion;

[0029] 2. Arc extinguishing components;

[0030] 21. First arc-extinguishing chamber; 22. Second arc-extinguishing chamber; 23. Grid; 231. Second concave portion; 232. Groove;

[0031] 3. Electromagnetic system;

[0032] 31. Driving shaft; 32. Static iron core; 33. Moving iron core; 34. Coil; 35. Metal cup; 36. Yoke;

[0033] 4. Shell;

[0034] 5. Cooling ring;

[0035] 51. Hollow part; 52. Inner surface; 53. Cooling part;

[0036] 6. Transfer device;

[0037] 61. First permanent magnet; 62. Second permanent magnet;

[0038] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0039] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0040] In the description of this application, it should be noted that, unless otherwise specified, "plurality" means more than two; terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are merely for the purpose of facilitating the description of this application and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0042] Figure 1 is a cross-sectional view of a contactor according to an embodiment of the present application. Figure 2 is another cross-sectional view of the contactor according to an embodiment of the present application, Figure 3 This is a partial structural diagram of a contactor according to an embodiment of the present application.

[0043] See also Figures 1 to 3 The contactor includes a housing 4 and an electromagnetic system 3, an arc extinguishing assembly 2 and a contact system 1 located inside the housing 4. The electromagnetic system 3 includes a driving shaft 31, a static 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 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 static contacts 11, which are arranged on both sides of the driving shaft 31, and the two static contacts 11 can be in detachable contact with the moving contact 12 respectively. The arc extinguishing assembly 2 is arranged on both sides of the moving contact 12 to extinguish the arc.

[0044] The electromagnetic system 3 is completely enclosed by a metal cup 35, which primarily serves as a magnetic yoke. Its large metal surface area aids in arc cooling. The metal cup 35 is made of a magnetically conductive metal, such as electrical pure iron. The drive shaft 31 is made of an insulating material, providing electrical isolation between the moving contact 12 and the moving iron core 33.

[0045] When the contactor's coil 34 is energized, the current within the coil 34 generates a magnetic field. This magnetic field causes the static iron core 32 to generate an electromagnetic attraction that attracts the moving iron core 33, causing the contactor's moving contact 12 to operate simultaneously, thereby closing the moving contact 12 with the static contact 11. When the contactor's coil is de-energized, the electromagnetic attraction disappears, disconnecting the moving contact 12 from the static contact 11. However, when the coil 34 is de-energized, high voltage and high current exist in the output circuit, causing an arc to form between the moving contact 12 and the static contact 11. This arc can be cut and extinguished by the arc extinguishing assembly 2.

[0046] However, the generation of arc will delay the circuit breaking. Higher arc energy may even burn the moving contact 12 and the static contact 11, causing the moving contact 12 and the static contact 11 to be welded. In severe cases, fire and explosion may occur.

[0047] In view of this, an embodiment of the present application provides a contact arc extinguishing system for a contactor, which is used to quickly extinguish the arc between contacts when disconnecting the circuit, thereby improving the reliability of the contactor.

[0048] Figure 4 This is a structural diagram of the contact arc extinguishing system of an embodiment of the present application. Figure 5 yes Figure 4 A structural schematic diagram of the moving contact in the contact arc extinguishing system shown.

[0049] See also Figure 4 and Figure 5The embodiment of the present application provides a contact arc extinguishing system for a contactor, wherein the contactor includes a driving central shaft 31, and the contact arc extinguishing system includes two static contacts 11, a moving contact 12, and an arc extinguishing assembly 2. The arc extinguishing assembly 2 includes a first arc extinguishing chamber 21 and a second arc extinguishing chamber 22 arranged opposite to each other along a first direction X. The moving contact 12 is located between the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22. The moving contact 12 is in detachable contact with the two static contacts 11 and is capable of generating an arc when separated. The moving contact 12 includes a contact body 121 and two extensions 122. The contact body 121 is connected to the driving central shaft 31, wherein one extension 122 extends from the contact body 121 toward the first arc extinguishing chamber 21, and the other extension 122 extends from the contact body 121 toward the second arc extinguishing chamber 22. The projection of the extension portion 122 along the first direction X partially covers the corresponding arc extinguishing assembly 2 , and the portion of at least one extension portion 122 projected along the first direction X that covers the corresponding arc extinguishing assembly 2 is in detachable contact with the static contact 11 .

[0050] It should be noted that detachably contacting means that the two can be in a contact state or a separated state.

[0051] It should be noted that, one of the extension portions 122 extending toward the first arc extinguishing chamber 21 means that one of the extension portions 122 extends toward the position where the first arc extinguishing chamber 21 is located, pointing to the corresponding first arc extinguishing chamber 21; the other extension portion 122 extending toward the second arc extinguishing chamber 22 means that the other extension portion 122 extends toward the position where the second arc extinguishing chamber 22 is located, pointing to the corresponding second arc extinguishing chamber 22.

[0052] In the embodiment of the present application, the extension portion 122 and the corresponding arc-extinguishing assembly 2 refer to one extension portion 122 and the adjacent first arc-extinguishing chamber 21 and the other extension portion 122 and the adjacent second arc-extinguishing chamber 22 .

[0053] The projection of the extension portion 122 along the first direction X partially covers the corresponding arc extinguishing assembly 2, which means that in the first direction X, in the extension portion 122 and the corresponding first arc extinguishing chamber 21, the projection of the extension portion 122 along the first direction X on the first arc extinguishing chamber 21 covers part of the first arc extinguishing chamber 21; in the second arc extinguishing chamber 22 and the corresponding extension portion 122, the projection of the extension portion 122 along the first direction X on the second arc extinguishing chamber 22 covers part of the second arc extinguishing chamber 22.

[0054] The arc generated between one of the two static contacts 11 and the moving contact 12 enters the first arc extinguishing chamber 21 , and the arc generated between the other static contact 11 and the moving contact 12 enters the second arc extinguishing chamber 22 .

[0055] The moving contact 12 of the contact arc extinguishing system provided in the embodiment of the present application includes a contact body 121 and two extensions 122. The two extensions 122 are not only closer to the corresponding first arc extinguishing chamber 21 and the second arc extinguishing chamber 22 relative to the contact body 121, but the projection of the extension 122 along the first direction X covers the corresponding arc extinguishing assembly 2, and the part of the extension 122 that covers the corresponding arc extinguishing assembly 2 is in detachable contact with the static contact 11. Therefore, the arc generated when the static contact 11 is separated from the extension 122 is not only close to the first arc extinguishing chamber 21 and / or the second arc extinguishing chamber 22, but also opposite to the first arc extinguishing chamber 21 and / or the second arc extinguishing chamber 22 in the first direction X. The arc can easily enter the first arc extinguishing chamber 21 and / or the second arc extinguishing chamber 22, and the arc travel path is significantly shortened, thereby accelerating the arc extinguishing efficiency and improving the arc extinguishing effect.

[0056] Optionally, the first direction X is perpendicular to the movement direction of the moving contact 12 .

[0057] Optionally, the cross-section of the contact body 121 perpendicular to the moving direction of the moving contact 12 is in the shape of a rectangle.

[0058] Optionally, the projections of the two extensions 122 along the first direction X cover portions of the corresponding arc extinguishing assemblies 2 and are in one-to-one correspondence and detachably contact with the two static contacts 11 .

[0059] In some embodiments, the projection of the extension 122 along the second direction Y partially covers the corresponding arc-extinguishing assembly 2 , and the portion of the projection of at least one extension 122 along the second direction Y that covers the corresponding arc-extinguishing assembly 2 is in detachable contact with the static contact 11 , and the second direction Y is perpendicular to the first direction X. Optionally, the second direction Y is perpendicular to the movement direction of the moving contact 12 .

[0060] In the embodiment of the present application, the projection of the extension portion 122 along the second direction Y partially covers the corresponding arc extinguishing assembly 2, which means that, in the second direction Y, in the extension portion 122 and the corresponding first arc extinguishing chamber 21, the projection of the extension portion 122 along the second direction Y on the first arc extinguishing chamber 21 covers part of the first arc extinguishing chamber 21; in the second arc extinguishing chamber 22 and the corresponding extension portion 122, the projection of the extension portion 122 along the second direction Y on the second arc extinguishing chamber 22 covers part of the second arc extinguishing chamber 22.

[0061] In this way, the extension portion 122 is opposite to the corresponding arc extinguishing component 2 in the first direction X and the second direction Y, and the first direction X and the second direction Y are perpendicular to each other, so the arc extinguishing component 2 is in a semi-enclosed state with respect to the corresponding extension portion 122. The distance between the extension portion 122 and the arc extinguishing component 2 is extremely close, and the arc travel path is extremely short, thereby greatly accelerating the arc extinguishing efficiency and significantly improving the arc extinguishing effect.

[0062] Optionally, the projections of the two extensions 122 along the second direction Y cover portions of the corresponding arc extinguishing assemblies 2 and are in one-to-one correspondence and detachably contact with the two static contacts 11 .

[0063] In some optional embodiments, the two extensions 122 correspond to the two static contacts 11 in a one-to-one manner and are in detachable contact with each other.

[0064] The two extensions 122 are in detachable contact with the static contacts 11 on the corresponding sides. In this way, the arcs on both sides of the moving contact 12 can enter the arc extinguishing assembly 2 more quickly, and there will be no large arc extinguishing time difference between the arcs on both sides, which will cause delayed circuit disconnection, thereby improving the arc extinguishing effect of the contact arc extinguishing system.

[0065] The shapes or sizes of the two extension portions 122 in the embodiment of the present application may be the same or different, and the present application does not impose any further restrictions on this.

[0066] In some optional embodiments, the extension portion 122 includes a first surface 123 facing the static contact 11 and a protrusion 124 protruding from the first surface 123 . The extension portion 122 is in detachable contact with the static contact 11 via the protrusion 124 .

[0067] The projection of the protrusion 124 along the first direction X partially covers the corresponding arc extinguishing assembly 2 , and the portion of the protrusion 124 along the first direction X that covers the corresponding arc extinguishing assembly 2 is in detachable contact with the static contact 11 .

[0068] The embodiment of the present application does not limit the shape of the protrusion 124. Optionally, the cross-sectional shape of the protrusion 124 in the protruding direction is circular. Of course, the cross-sectional shape of the protrusion 124 in the protruding direction can also be elliptical or other irregular shapes, and the present application does not make too many restrictions here.

[0069] By providing the protrusion 124 on the first surface 123 and utilizing the protrusion 124 to detachably contact the static contact 11, the movement path of the movable contact 12 can be shortened, shortening the time from arc generation to arc entry into the arc extinguishing assembly 2, thereby improving arc extinguishing efficiency. In addition, the movable contact 12 can maintain close contact with the static contact 11 via the protrusion 124, improving the abutment reliability of the movable contact 12 and the static contact 11.

[0070] The shapes of the two protrusions 124 in the embodiment of the present application may be the same or different, and the present application does not impose any further restrictions on this.

[0071] Optionally, the projection of the protrusion 124 along the second direction Y partially covers the corresponding arc extinguishing assembly 2 , and the portion of the projection of the protrusion 124 along the second direction Y that covers the corresponding arc extinguishing assembly 2 is in detachable contact with the static contact 11 .

[0072] Please continue to refer to Figure 5In some optional embodiments, the contact body 121 includes a second surface 125 facing the static contact 11 , and the first surface 123 and the second surface 125 are flush with each other.

[0073] The first surface 123 and the second surface 125 are flush with each other, that is, the contact body 121 and the extension portion 122 are flush with each other, which facilitates the manufacture of the extension portion 122 .

[0074] In some embodiments, the contact body 121 includes a first end 126 and a second end 127 disposed opposite each other along a second direction Y. Two extensions 122 are connected to the first end 126 and the second end 127 in a one-to-one correspondence. The angle between the extensions 122 and the second direction Y is 30°≤θ≤80°, where the second direction Y is perpendicular to the first direction X. Optionally, θ is in the range of 50°≤θ≤70°.

[0075] When the included angle is set to 30°-80°, the arc striking angle of the extension portion 122 and the direction of the Lorentz force generated by the magnetic field therein both point toward the corresponding arc extinguishing assembly 2, and the arc guiding effect of the extension portion 122 is better. When the included angle is set to 50°-70°, the extension portion 122 can guide the arc deep into the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22, fully contacting the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22, and being cut more quickly.

[0076] Optionally, the value of θ is 55°, 60°, or 65°.

[0077] Figure 6 yes Figure 4 A schematic structural diagram of the grid of the first arc extinguishing chamber in the contact arc extinguishing system is shown.

[0078] See also Figure 6 In some optional embodiments, the first arc-extinguishing chamber 21 includes a plurality of stacked grid plates 23 and an arc-strike plate located at one end of the plurality of grid plates 23. The arc-strike plate is stacked with the grid plates 23 and is used to transfer the arc root of the static contact 11 to the first arc-extinguishing chamber 21. A first recess is formed on the end of the arc-strike plate that mates with the static contact 11. The first recess is spaced from the outer periphery of the static contact 11, and the two engage in a concave-convex manner to guide the arc into the first arc-strike chamber.

[0079] The grid 23 includes two opposite sides along the second direction Y, one of which is formed with a second recess 231 . The extension 122 and the second recess 231 can be matched with each other and spaced apart to guide the arc into the second recess 231 .

[0080] Further optionally, the second recess 231 is recessed inward to form a groove 232 , and the groove is used to lengthen the arc.

[0081] Optionally, the grid 23 may be made of cold-rolled steel plate, copper plate, Nomex profile or ceramic.

[0082] The structure of the second arc-extinguishing chamber 22 is similar to that of the first arc-extinguishing chamber 21 , and will not be further described in this application.

[0083] Figure 7 yes Figure 4 A structural schematic diagram of the cooling ring in the contact arc extinguishing system is shown.

[0084] Please refer to Figure 7 In some embodiments, the contact arc extinguishing system further includes a cooling ring 5, which is an annular structure having a hollow portion 51. The arc extinguishing assembly 2 is arranged in the hollow portion 51. The cooling ring 5 surrounds at least part of the movement path of the moving contact 12 to cool the arc.

[0085] The cooling ring 5 surrounds at least part of the moving path of the moving contact 12 , which means that the cooling ring 5 surrounds the outer peripheral side of the moving path of the moving contact 12 , and at least part of the moving path of the moving contact 12 is surrounded by the cooling ring 5 .

[0086] In the embodiment of the present application, the motion path of the movable contact 12 refers to the motion path of the entire movable contact 12, and does not refer to the motion path of a specific point therein. That is, the motion path of the movable contact 12 includes the first position where the movable contact 12 contacts the stationary contact 11 and the second position where the movable contact 12 is farthest away from the stationary contact 11. The space that the movable contact 12 passes through from the first position to the second position is the motion path of the movable contact 12.

[0087] Optionally, the length direction, that is, the axial direction, of the cooling ring 5 is parallel to the movement direction of the moving contact 12 .

[0088] It should be noted that the arc extinguishing assembly 2 is disposed in the hollow portion 51 , and may be entirely located in the hollow portion 51 , or may be partially located in the hollow portion 51 .

[0089] Optionally, the cooling ring 5 is a circular ring structure. Further, the cooling ring 5 is a concentric ring structure. The driving shaft 31 is located at the axis of the cooling ring 5.

[0090] Of course, the cooling ring 5 may also be other annular structures, such as an elliptical annular structure, and this application does not make too many restrictions here.

[0091] In some optional embodiments, the cooling ring 5 is made of ceramic material. Of course, it can also be made of other materials with cooling capacity and insulation.

[0092] The hollow portion 51 of the cooling ring 5 refers to a hollow space surrounded by the annular structure.

[0093] The arc extinguishing assembly 2 is arranged in the hollow part 51 of the cooling ring 5. The cooling ring 5 surrounds at least part of the movement path of the moving contact 12. Part of the arc and part of the high-temperature gas generated between the static contact 11 and the moving contact 12 enter the arc extinguishing assembly 2 through the cooling ring 5. The arc and high-temperature gas that contact 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 arc into multiple short arcs. The grid and the cooling ring 5 enhance the cooling and surface recombination of the short arc and the high-temperature gas, so that the high-temperature gas cools down quickly and the arc disappears quickly, thereby improving the breaking capacity of the contact arc extinguishing system.

[0094] In some embodiments, the cooling ring 5 includes an inner surface 52 forming a hollow portion 51 and a cooling portion 53, wherein the cooling portion 53 is protruding relative to the inner surface 52 and is arranged in an area of ​​the cooling ring 5 adjacent to at least one of the two extension portions 122, and the cooling ring 5 cools the arc through the cooling portion 53.

[0095] It should be noted that the area of ​​the cooling ring 5 adjacent to the extension portion 122 refers to the area of ​​the cooling ring 5 that is closest to the extension portion 122 .

[0096] Optionally, the number of the cooling portions 53 is two, and the two cooling portions 53 correspond to the two extending portions 122 in a one-to-one manner.

[0097] The extension portion 122 is the location where the arc is generated, and the cooling portion 53 is adjacent to the extension portion 122. Therefore, the cooling portion 53 is closer to the arc than the inner surface 52, and can cool the part of the arc that cannot reach the inner surface 52, thereby increasing the contact area with the arc and improving the cooling effect; and when the distance to the extension portion 122 is closer, the arc can be cooled faster, thereby improving the cooling rate.

[0098] In some embodiments, in adjacent cooling portions 53 and extension portions 122 , a projection of the cooling portion 53 along the arrangement direction of the two extension portions 122 on the first plane at least partially covers a projection of the movement path of the extension portion 122 along the arrangement direction of the two extension portions 122 on the first plane.

[0099] The movement path of the extension portion 122 in the embodiment of the present application refers to the movement path of the entire extension portion 122 , and does not refer to the movement path of a certain point therein, that is, the space through which the extension portion 122 passes is the movement path of the extension portion 122 .

[0100] After the arc is generated between the static contact 11 and the moving contact 12, part of the arc passes through the cooling ring 5 and enters the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22, thereby expanding the extension length of the cooling part 53 toward the side of the arc extinguishing assembly 2, thereby increasing the contact area between this part of the arc and the cooling part 53 during the movement, thereby improving the cooling effect of the cooling ring 5.

[0101] In some optional embodiments, the cooling portion 53 is a plurality of protrusions 531 spaced apart on the inner surface 52 .

[0102] The embodiment of the present application does not limit the shape of the protrusion 531, which may be a long strip, a block, or an irregular shape.

[0103] The multiple protrusions 531 arranged at intervals can cut the arc and accelerate the disappearance of the arc.

[0104] Figure 8 Schematic diagram of the distribution of the magnetic field generated by the transfer device of the contact arc extinguishing system of the embodiment of the present application.

[0105] See also Figure 8 In some optional embodiments, the arc extinguishing assembly 2 further includes a transfer device 6, which is located on the outer periphery of the movable contact 12 and the arc extinguishing assembly 2, and the cooling ring 5 is located between the transfer device 6 and the movable contact 12. The transfer device 6 includes a first permanent magnet 61 and a second permanent magnet 62 with different polarities. The arc is transferred to the arc extinguishing assembly 2 under the action of the magnetic field generated by the first permanent magnet 61 and the second permanent magnet 62.

[0106] The magnetic field generated by the transfer device 6 covers the movement path of the arc, so that the arc is transferred to the arc extinguishing assembly 2 under the action of the magnetic field.

[0107] Optionally, the angle α between the direction of the maximum magnetic flux line between the first permanent magnet 61 and the second permanent magnet 62 and the second direction Y is in the range of 20°≤α≤45°.

[0108] Such an arrangement enables most of the arc to be deflected to the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22 in a predetermined direction.

[0109] like Figure 8 As shown, a rectangular coordinate system is established with the second plane parallel to the contact plane between the moving contact 12 and the static contact 11 as the horizontal plane, the line parallel to the second direction and passing through the driving axis 31 as the A axis, and the line parallel to the first direction and passing through the driving axis 31 as the B axis.

[0110] The first arc extinguishing chamber 21 and the second arc extinguishing chamber 22 are located on the outer peripheral side of the relative motion area between the moving contact 12 and the static contact 11, that is, Figure 8In 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 arranged symmetrically with respect to the center of the origin of the rectangular coordinate system. The first permanent magnet 61 and the second permanent magnet 62 are arranged on the outer peripheral sides of the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22. Exemplarily, the side of the first permanent magnet 61 facing the first arc extinguishing chamber 21 is the S pole, and the side of the second permanent magnet 62 facing the second arc extinguishing chamber 22 is the N pole, and a magnetic field from the N pole to the S pole is generated between the two. Figure 8 The middle dotted lines indicate the directions of multiple magnetic flux lines in the magnetic field generated by the transfer device 6 , and the directions of the multiple magnetic flux lines cover each quadrant of the coordinate system.

[0111] Assumptions Figure 8 As shown, the static contact 11 in the second quadrant is connected to the positive pole, and the static contact 11 in the fourth quadrant is connected to the negative pole. Then the return current of the contactor flows from the static contact 11 in the second quadrant to the moving contact 12, and then from the moving contact 12 to the static contact 11 in the fourth quadrant. Figure 8 The arc current between the static contact 11 and the moving contact 12 on the left side of the center penetrates the contact plane, while the arc current between the static contact 11 and the moving contact 12 on the right side penetrates the contact plane. According to Fleming's left-hand rule, the arc generated by the separation of the moving contact 12 and the static contact 11 is pulled out of the space between the moving contact 12 and the static contact 11 by the Lorentz force F and transferred clockwise to the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22. The arc is quickly cut and cooled by the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22, achieving the arc extinguishing effect.

[0112] An embodiment of the present application further provides a contactor, comprising the above-mentioned contact arc extinguishing system.

[0113] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A contact arc extinguishing system for a contactor, the contactor comprising a driving central shaft, characterized in that: The contact arc extinguishing system comprises: Two static contacts; The arc extinguishing assembly comprises a first arc extinguishing chamber and a second arc extinguishing chamber which are arranged opposite to each other along a first direction; a moving contact, located between the first arc extinguishing chamber and the second arc extinguishing chamber, the moving contact being in detachable contact with the two static contacts and capable of generating an arc when separated, the moving contact comprising a contact body and two extensions, the contact body being connected to the driving center shaft, the contact body comprising a first end and a second end oppositely arranged along a second direction, one of the extensions extending from the contact body toward the first arc extinguishing chamber, and the other extension extending from the contact body toward the second arc extinguishing chamber, the two extensions corresponding one-to-one with the two static contacts and being in detachable contact, and the two extensions being connected one-to-one with the first end and the second end; The projection of the extension portion along the first direction partially covers the corresponding arc extinguishing assembly, and the portion of the projection of at least one extension portion along the first direction that covers the corresponding arc extinguishing assembly is in detachable contact with the static contact; The projection of the extension portion along the second direction partially covers the corresponding arc extinguishing assembly, and the portion of the projection of at least one extension portion along the second direction covering the corresponding arc extinguishing assembly is in detachable contact with the static contact; The included angle between the extension portion and the second direction is 30°≤θ≤80°, wherein the first direction is perpendicular to the movement direction of the moving contact, the second direction is perpendicular to the movement direction of the moving contact, and the second direction is perpendicular to the first direction.

2. The contact arc extinguishing system of the contactor according to claim 1, characterized in that: The extending portion includes a first surface facing the static contact and a convex portion protruding from the first surface, and the extending portion is in detachable contact with the static contact via the convex portion.

3. The contact arc extinguishing system of the contactor according to claim 2, characterized in that: The contact body includes a second surface facing the static contact, and the first surface and the second surface are flush with each other.

4. The contact arc extinguishing system of the contactor according to claim 1, characterized in that: It also includes a cooling ring, which is an annular structure with a hollow portion. The arc extinguishing assembly is arranged in the hollow portion. The cooling ring surrounds at least a portion of the moving path of the moving contact to cool the arc.

5. The contact arc extinguishing system of the contactor according to claim 4, characterized in that: The cooling ring includes an inner surface forming the hollow portion and a cooling portion, the cooling portion is protruding relative to the inner surface and is arranged in a region of the cooling ring adjacent to at least one of the two extension portions, and the cooling ring cools the arc through the cooling portion.

6. The contact arc extinguishing system of the contactor according to claim 5, characterized in that: In the adjacent cooling portion and the extending portion, a projection of the cooling portion along the arrangement direction of the two extending portions on the first plane at least partially covers a projection of the movement path of the extending portion along the arrangement direction of the two extending portions on the first plane.

7. A contactor, characterized in that: The invention comprises a contact arc extinguishing system according to any one of claims 1 to 6.

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