Arc extinguishing system and isolating switch

Abstract

The arc extinguishing system comprises a moving contact assembly, a static contact and an arc extinguishing chamber, the moving contact assembly comprises a rotating part and a moving contact, the moving contact is installed on the rotating part, the moving contact is provided with a contact part, and the rotating part drives the contact part to be in contact with and separated from the static contact along an arc-shaped motion path. The arc extinguishing chamber comprises an arc extinguishing cover, a plurality of arc extinguishing grid sheets and a magnetic field driving assembly, and the magnetic field driving assembly comprises a magnet structure which comprises at least one permanent magnet and is used for generating a magnetic field for driving an arc to move; the magnetic conduction structure is used for guiding the magnetic field of the magnet structure, so that the magnetic field covers the motion path; the magnet structure and the magnetic conduction structure are arranged in an arc shape along the movement path of the contact part, it can be ensured that the magnetic field accurately covers the movement path, the magnetic field can be concentrated to the movement path, the driving force of the magnetic field to the electric arc is improved, the combination of the magnet structure and the magnetic conduction structure can meet the breaking requirements of large current and small current, and meanwhile the cost can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to an arc extinguishing system and an isolating switch having the arc extinguishing system. Background Technology

[0002] In recent years, the rapid development of the photovoltaic and energy storage industries, especially under DC high-voltage and high-current operating conditions, has gradually increased the requirements for the breaking performance of disconnecting switches in power distribution systems. As a major switching device in power distribution systems, disconnecting switches are mainly used for isolating power supplies, switching operations, and connecting and disconnecting low-current circuits. They consist of an operating mechanism and a contact system. The arc-extinguishing chamber, as an important component of the disconnecting switch's contact system, directly affects the product's connecting and disconnecting performance.

[0003] Traditional arc extinguishing systems mainly use pure grid plates or pure magnets:

[0004] 1. Pure grid type: It extinguishes the arc by cutting the arc to increase the arc voltage, but it is not capable of breaking large currents.

[0005] 2. Pure magnet type: Arc extinguishing is achieved by stretching the electric arc with magnetic blow, but it is costly and has poor breaking effect with small current.

[0006] None of the above solutions can simultaneously meet the breaking requirements of both high and low currents, and their arc-extinguishing efficiency is limited. Therefore, there is an urgent need for an arc-extinguishing system that is low-cost, has excellent arc-extinguishing performance, and can adapt to a wide current range. Utility Model Content

[0007] The purpose of this invention is to overcome at least one defect of the prior art and provide an arc extinguishing system.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An arc-extinguishing system includes a moving contact assembly, a stationary contact, and an arc-extinguishing chamber. The moving contact assembly includes a rotating part and a moving contact, the moving contact being mounted on the rotating part and having a contact portion. The rotating part drives the contact portion to contact and separate from the stationary contact along an arc-shaped movement path. The arc-extinguishing chamber includes an arc-extinguishing shroud, a plurality of arc-extinguishing grids, and a magnetic field driving assembly. The magnetic field driving assembly includes:

[0010] A magnetic structure, including at least one permanent magnet, for generating a magnetic field that drives the movement of an electric arc;

[0011] A magnetically conductive structure is used to guide the magnetic field of the magnet structure so that the magnetic field covers the motion path.

[0012] The magnet structure and the magnetic conductive structure are arranged in an arc shape along the movement path of the contact portion.

[0013] Preferably, the magnet structure comprises a plurality of permanent magnets arranged in a Helbeck array.

[0014] Preferably, the arc-extinguishing chamber includes two magnetic field driving components, which are symmetrically arranged, and the movement path of the contact portion is located between the two magnetic field driving components.

[0015] Preferably, the moving contact includes two contact plates arranged parallel to both sides of the stationary contact. Each of the two contact plates is provided with a contact portion. The contact portions of the two contact plates correspond to the two magnetic field driving components respectively. Under the drive of the rotating part, the contact portions of the two contact plates can simultaneously contact and separate from both sides of the stationary contact.

[0016] Preferably, the magnet structure includes a first magnet structure, which is disposed at one end of the magnetically conductive structure near the corresponding stationary contact, and the first magnet structure includes at least one permanent magnet.

[0017] Preferably, the magnet structure further includes a second magnet structure, the second magnet structure including at least one permanent magnet, and the magnetically conductive structure is located between the first magnet structure and the second magnet structure.

[0018] Preferably, the first magnet structure includes a plurality of permanent magnets arranged in a Helbeck array.

[0019] Preferably, the first magnet structure includes three permanent magnets: a front permanent magnet and a rear permanent magnet, and a middle permanent magnet disposed between the front and rear permanent magnets. The N poles of the front permanent magnet and the rear permanent magnet are arranged opposite each other, and the N pole of the middle permanent magnet is arranged towards the movement path; or, the S poles of the front permanent magnet and the rear permanent magnet are arranged opposite each other, and the S pole of the middle permanent magnet is arranged towards the movement path.

[0020] Preferably, the second magnet structure includes a second permanent magnet, and the magnetic pole direction of the second permanent magnet is the same as the magnetic pole direction of the permanent magnet in the first magnet structure.

[0021] Preferably, the arc-extinguishing shroud includes two side plates arranged opposite each other, and a top plate disposed between the two side plates on the side away from the moving contact. The two side plates are spaced apart from the top plate. The arc-extinguishing grid is disposed between the two side plates. The arc-extinguishing grid is arranged in an arc shape along the movement path of the contact portion with the rotation center of the moving contact as the center. Two magnetic field driving components are respectively disposed on the side of the two side plates away from the corresponding contact portion, and are respectively located on the side of the arc-extinguishing grid near the rotation center of the moving contact. The two side plates are respectively provided with opposing protruding mounting platforms, and each mounting platform is provided with a mounting groove for accommodating the magnetic field driving components.

[0022] Preferably, the mounting slots include a first mounting slot, a second mounting slot, and a third mounting slot that are spaced apart from each other and are respectively used for mounting the first magnet structure, the magnetic conductive structure, and the second magnet structure.

[0023] Preferably, the cross-sections of the first magnet structure, the magnetic guiding structure, and the second magnet structure perpendicular to the axis of the moving contact are all fan-shaped rings. The first magnet structure, the magnetic guiding structure, and the second magnet structure all include an outer arc surface and an inner arc surface arranged opposite to each other, and the curvature of the outer arc surface and the curvature of the inner arc surface are the same as the curvature of the motion path of the contact part.

[0024] Preferably, the arc-extinguishing grid includes two grid support legs spaced apart, with an arc-extinguishing notch formed between the two grid support legs, and the two magnetic field drive components are respectively positioned opposite the ends of the two grid support legs facing the rotating part.

[0025] Preferably, the arc-extinguishing grid is a metal grid, including at least one first grid and several second grids, the thickness of the first grid is greater than that of the second grids, and the first grid is disposed on the side of the second grid close to the stationary contact.

[0026] A disconnecting switch, including the aforementioned arc-extinguishing system.

[0027] The arc extinguishing system in this embodiment uses a permanent magnet to generate a constant magnetic field to drive the arc into the arc extinguishing grid. The magnetic field distribution of the permanent magnet is then guided and enhanced by a magnetic guide sheet. This not only ensures that the magnetic field accurately covers the movement path, but also concentrates the magnetic field on the movement path, thereby increasing the driving force of the magnetic field on the arc. The combination of these two methods can meet the requirements of both large and small current interruption, while also reducing costs.

[0028] In addition, the first magnet structure is located at the end of the magnetically conductive structure near the stationary contact. Since the first magnet structure is located at the end of the magnetically conductive structure near the stationary contact, the electric arc generated at the beginning of the separation of the moving contact and the stationary contact can first enter the strong magnetic field generated by the first magnet structure itself. The strong magnetic field of the first magnet structure drives part of the arc to quickly enter the arc-extinguishing grid, further enabling the arc to quickly leave the contact system and avoid contact erosion. At the same time, it guides other arcs into the magnetic field region of the magnetically conductive structure and lengthens the arc, which is convenient for subsequent arc extinguishing.

[0029] Furthermore, the second magnet structure is located far from the stationary contact, and its magnetic field mainly acts on the end of the arc. After the arc leaves the contact, it provides a continuous driving force to accelerate the arc into the arc-extinguishing grid. Moreover, by connecting the magnetic fields of the first and second magnet structures through the magnetic conductive structure, a magnetic field that is more matched to the movement path of the contact part can be formed. The magnetic field is fully covered in the initial, middle and final stages of the movement path, accurately driving the arc movement and improving the driving efficiency of the magnet structure.

[0030] In addition, the magnet structure arranges multiple permanent magnets in a Heilbeck array, so that the magnetic fields of the multiple permanent magnets are superimposed in the same direction on the side closer to the movement path to form an enhanced magnetic field, and canceled in the opposite direction on the side farther from the movement path to form a weakened magnetic field. Not only can the enhanced magnetic field formed by superposition drive the arc to move faster to achieve better arc extinguishing performance, but the weakened magnetic field formed by cancellation can also reduce the impact on other parts. Attached Figure Description

[0031] Figure 1 This is a top view of the contact system in the first embodiment of this utility model;

[0032] Figure 2 This is a schematic diagram of the contact system in the first embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the cooperation between the magnetic field driving component and the arc extinguishing cover in the first embodiment of this utility model;

[0034] Figure 4 This is a schematic diagram of the cooperation between the moving contact and the arc extinguishing system in the first embodiment of this utility model;

[0035] Figure 5 This is a schematic diagram of the first magnet structure in the first embodiment of this utility model;

[0036] Figure 6 This is an exploded view of the first magnet structure in the first embodiment of this utility model;

[0037] Figure 7 This is a schematic diagram of the contact system in the second embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the cooperation between the magnetic field driving component and the arc extinguishing cover in the second embodiment of this utility model;

[0039] Figure 9 This is a schematic diagram of the first magnet structure in the second embodiment of this utility model;

[0040] Figure 10 This is an exploded view of the first magnet structure in the second embodiment of this utility model;

[0041] In the picture:

[0042] 1. Contact system 3.4. Motion path

[0043] 2 Arc-extinguishing chamber 35 contact plate

[0044] 3 moving contact assembly 50 magnetic structure

[0045] 4 stationary contact 51 first magnet structure

[0046] 5. Magnetic field drive component 52. Second magnet structure

[0047] 21 Arc-extinguishing shield 53 Front permanent magnet

[0048] 23 Arc-quenching grid plates 54 Permanent magnets

[0049] 24 side panels, 55 rear permanent magnets

[0050] 25 Top Plate 231 Grid Support

[0051] 26 exhaust port, 232 arc extinguishing notch

[0052] 27 Mounting station 233 First grid plate

[0053] 28 Mounting slot 234 Second grid plate

[0054] 31 Rotating part 281 First mounting slot

[0055] 32 moving contact 282 second mounting slot

[0056] 33 Contact part 283 Third mounting slot Detailed Implementation

[0057] The specific implementation of the arc-extinguishing system of this utility model is further described below with reference to the accompanying drawings. The arc-extinguishing system of this utility model is not limited to the description of the following embodiments.

[0058] like Figure 1 As shown, this embodiment provides a disconnecting switch, including an operating mechanism (not shown) and at least one contact system 1. The operating mechanism and the contact system 1 are stacked, and the moving contact assembly of the operating mechanism and the contact system 1 are connected by a linkage. The moving contact assemblies of adjacent contact systems 1 are connected to each other. The contact system 1 drives the moving contact assembly to rotate and contact or separate from the stationary contact through the operating mechanism, thereby realizing the connection and disconnection of the internal circuit of its unit.

[0059] like Figure 1-2As shown, the contact system 1 includes a housing, and a contact system and an arc-extinguishing chamber 2 disposed within the housing. The contact system includes a moving contact assembly 3 and a stationary contact 4. The moving contact assembly 3 includes a rotating part 31 and a moving contact 32. The operating mechanism is connected to the rotating part 31 of the contact system 1. The operating mechanism drives the moving contact assembly 3 to rotate through the rotating part 31. The moving contact assembly 3 is provided with the moving contact 32. Specifically, the moving contact 32 is mounted on the rotating part 31. When the moving contact assembly 3 rotates, it drives the contact part 33 of the moving contact 32 to perform a circular motion. For ease of description, the arc trajectory traversed by the contact part 33 is called the motion path 34. The stationary contact 4 is disposed at one end of the motion path 34. The rotating part 31 drives the moving contact 32 to rotate and contact or disconnect with the stationary contact 4 to realize the connection and disconnection of the circuit.

[0060] In a preferred embodiment of the contact system 1, the contact system 1 includes two sets of stationary contacts 4 and two sets of arc-extinguishing chambers 2 disposed within a housing. The stationary contacts 4 extend out of the housing for connection with an external circuit. The rotating part 31 is located at the center of the housing, and the moving contact 32 passes through the rotating part 31 and rotates with the rotating part 31 to cooperate with the two sets of stationary contacts 4. The housing is rectangular, and the two sets of arc-extinguishing chambers 2 are symmetrically disposed on both radial sides of the rotating part 31 and at two opposite corners of the rectangular housing. The two sets of stationary contacts 4 are symmetrically disposed on the other two radial sides of the rotating part 31. During the opening and closing operation, the rotating part 31 rotates around its axis, causing the moving contacts 32 at both ends to contact and disconnect with the two stationary contacts 4 respectively through the arc-extinguishing chambers 2.

[0061] like Figure 3 As shown, one improvement in this embodiment is that the arc-extinguishing chamber 2 includes an arc-extinguishing cover 21, a magnetic field driving assembly 5, and a plurality of arc-extinguishing grid plates 23. The magnetic field driving assembly 5 includes:

[0062] A magnetic structure, including at least one permanent magnet, for generating a magnetic field that drives the movement of an electric arc;

[0063] The magnetic guiding structure 50 is used to guide the magnetic field of the magnet structure so that the magnetic field covers the motion path 34.

[0064] The magnet structure and the magnetic conductive structure 50 are arranged in an arc shape along the movement path 34 of the contact portion 33.

[0065] The arc extinguishing system of this embodiment drives the electric arc into the arc extinguishing grid plate 23 by generating a constant magnetic field through a permanent magnet. Then, the magnetic field distribution of the permanent magnet is guided and enhanced by the magnetic conductive plate. This not only ensures that the magnetic field accurately covers the movement path 34, but also concentrates the magnetic field on the movement path 34, thereby increasing the driving force of the magnetic field on the electric arc. The combination of the two can meet the requirements of breaking both large and small currents, while also reducing costs.

[0066] like Figure 4As shown, the moving contact 32 in this embodiment includes two contact plates 35 arranged parallel to each other on both sides of the stationary contact 4. The stationary contact 4 can be inserted between the two contact plates 35. The two contact plates 35 can contact and separate from the sides of the stationary contact 4 under the drive of the rotating part 31. The rotating part 31 is provided with a spring sheet (not shown) for driving the contact plates 35 to press against the stationary contact 4, so that the two contact plates 35 clamp the stationary contact 4 from both sides to ensure contact pressure.

[0067] The arc-extinguishing chamber 2 includes two magnetic field driving components 5. The ends of the two contact plates 35 are disposed between the two magnetic field driving components 5 and correspond to each of the two magnetic field driving components 5 respectively. The two magnetic field driving components 5 are symmetrically arranged, and the movement path 34 of the contact portion 33 is located between the two magnetic field driving components 5. By setting two sets of corresponding contact plates 35 and magnetic field driving components 5, and placing the magnetic field driving components 5 on the back of the contact plates 35 away from the stationary contact 4, the magnetic field drive can drive the arc into the arc-extinguishing grid plate 23, and at the same time generate a driving force perpendicular to the contact plate 35 on the arc, quickly stripping the arc to avoid contact erosion.

[0068] like Figure 1-3 In the first embodiment shown, the magnet structure includes a first magnet structure 51, which includes at least one permanent magnet. The first magnet structure 51 is disposed at one end of the magnetically conductive structure 50 near the stationary contact 4.

[0069] The first magnet structure 51 is located at the end of the magnetically conductive structure 50 near the corresponding stationary contact 4. The electric arc generated at the beginning of the separation of the moving contact 32 from the stationary contact 4 can first enter the strong magnetic field generated by the first magnet structure 51 itself. The strong magnetic field of the first magnet structure 51 drives part of the electric arc to quickly enter the arc-extinguishing grid plate 23, further enabling the electric arc to quickly leave the contact system and avoid contact ablation. At the same time, it guides other electric arcs into the magnetic field region of the magnetically conductive structure 50 and lengthens the electric arc, which is convenient for subsequent arc extinguishing.

[0070] like Figure 7-8 In the second embodiment shown, the magnet structure further includes a second magnet structure 52. The first magnet structure 51 and the second magnet structure 52 each include at least one permanent magnet. The magnetically conductive structure 50 is located between the first magnet structure 51 and the second magnet structure 52. The first magnet structure 51 is disposed at one end of the magnetically conductive structure 50 near the stationary contact 4.

[0071] The second magnet structure 52 is located away from the corresponding stationary contact 4. Its magnetic field mainly acts on the end of the arc, providing a continuous driving force after the arc leaves the contact, accelerating the arc into the arc-extinguishing grid 23. Moreover, by connecting the magnetic fields of the first magnet structure 51 and the second magnet structure 52 through the magnetic conductive structure 50, a magnetic field that is more matched to the movement path 34 of the contact part 33 can be formed. The magnetic field is fully covered in the initial, middle and final stages of the movement path 34, accurately driving the arc movement and improving the driving efficiency of the magnet structure.

[0072] Furthermore, the first magnet structure 51 includes a plurality of permanent magnets arranged in a Hellbeck array, such that the magnetic fields of the plurality of permanent magnets are superimposed in the same direction on the side close to the motion path 34 to form an enhanced magnetic field, and are canceled in opposite directions on the side away from the motion path 34 to form a weakened magnetic field. Not only can the enhanced magnetic field formed by superposition drive the arc to move faster to achieve better arc extinguishing performance, but the weakened magnetic field formed by cancellation can also reduce the impact on other parts.

[0073] It is understandable that the second magnet structure 52 can also be a permanent magnet arranged in a Hellbeck array, and the enhanced magnetic field formed by the superposition of the second magnet junction and the enhanced magnetic field formed by the superposition of the first magnet structure 51 junction are located on the same side.

[0074] like Figure 1-3 The first embodiment shown in Figures 5-6 includes three permanent magnets: a front permanent magnet 53 and a rear permanent magnet 55, and a middle permanent magnet 54 disposed between the front permanent magnet 53 and the rear permanent magnet 55. The N poles of the front permanent magnet 53 and the rear permanent magnet 55 are arranged opposite each other, and the N pole of the middle permanent magnet 54 is arranged towards the motion path 34. The N poles of the middle permanent magnets 54 of the two magnetic field driving components 5 are arranged facing each other.

[0075] The second magnet structure 52 includes a second permanent magnet. The N pole of the second permanent magnet is oriented in the same direction as the N pole of the middle permanent magnet 54. The N poles of the second permanent magnets in the two magnetic field drive components 5 are arranged facing each other. By arranging the N poles of the middle permanent magnets 54 of the two magnetic field drive components 5 facing each other and arranging the N poles of the second permanent magnets facing each other, the symmetrically distributed polarity can achieve polarity-free installation.

[0076] like Figure 7-10The second embodiment is shown. The first magnet structure 51 includes three permanent magnets, but the polarity direction of the permanent magnets is different from that of the first embodiment. In this embodiment, the S poles of the front permanent magnet 53 and the rear permanent magnet 55 are arranged opposite each other. The S pole of the middle permanent magnet 54 is arranged towards the movement path 34. At the same time, the S poles of the middle permanent magnets 54 of the two magnetic field drive components 5 are arranged facing each other. The S pole of the second permanent magnet is oriented in the same direction as the S pole of the middle permanent magnet 54. The S poles of the middle second permanent magnets of the two magnetic field drive components 5 are arranged facing each other.

[0077] As another embodiment of the first magnet structure 51, the first magnet structure 51 may also include four or more permanent magnets. The permanent magnets may be arranged in a Halebeck array or an approximate Halebeck array, and superimposed on the side near the motion path 34 to form an enhanced magnetic field. In addition, the first magnet structure 51 may also be provided with only a single permanent magnet.

[0078] like Figure 1 As shown, the cross-sections of the first magnet structure 51, the magnetic guiding structure 50, and the second magnet structure 52 perpendicular to the axis of the moving contact 32 are all fan-shaped. The first magnet structure 51, the magnetic guiding structure 50, and the second magnet structure 52 all include an outer arc surface and an inner arc surface arranged opposite to each other, and the curvature of the outer arc surface and the curvature of the inner arc surface are the same as the curvature of the movement path 34 of the contact portion 33.

[0079] Preferably, the cross-sections of the front permanent magnet 53, the middle permanent magnet 54, and the rear permanent magnet 55 perpendicular to the axis of the moving contact 32 are all fan-shaped. Each of the front permanent magnet 53, the middle permanent magnet 54, and the rear permanent magnet 55 includes an outer arc surface and an inner arc surface arranged opposite to each other. The curvature of the arc surface formed by connecting the inner arc surfaces of the front permanent magnet 53, the middle permanent magnet 54, and the rear permanent magnet 55, as well as the curvature of the arc surface formed by connecting the outer arc surfaces of the front permanent magnet 53, the middle permanent magnet 54, and the rear permanent magnet 55, are the same as the curvature of the movement path 34 of the contact portion 33.

[0080] Preferably, the magnetic conductive structure 50 in this embodiment is an integral structure, such as a casting or forging followed by machining. The magnetic conductive structure 50 can also be a segmented riveted structure composed of multiple magnetic conductive sheets. The integral magnetic conductive structure 50 has high mechanical strength and a more uniform magnetic field distribution, while the segmented riveted structure has lower cost and is more flexible in maintenance, allowing for individual replacement of damaged magnetic conductive sheets. The magnetic conductive structure 50 typically uses magnetic conductive materials such as 10# steel or 45# steel for the contact part 33.

[0081] like Figure 3 , 8As shown, the arc-extinguishing cover 21 includes two side plates 24 arranged opposite to each other, and a top plate 25 arranged between the two side plates 24 on the side away from the moving contact 32. The two side plates 24 are respectively spaced apart from the top plate 25. Arc-shaped exhaust ports 26 are formed at the ends of the two side plates 24 near the top plate 25. The arc-extinguishing grid plate 23 is arranged between the two side plates 24 and is connected to the two side plates 24 respectively. The arc-extinguishing grid plate 23 is arranged in an arc shape along the movement path 34 of the contact part 33 with the rotation center of the moving contact 32 as the center. Two magnetic field driving components 5 are respectively arranged on the side of the two side plates 24 away from the corresponding contact part 33, and are respectively located on the side of the arc-extinguishing grid plate 23 near the rotation center of the moving contact 32. The two side plates 24 are respectively provided with mounting platforms 27 protruding towards each other. The mounting platforms 27 are respectively provided with mounting grooves 28 for accommodating the magnetic field driving components 5.

[0082] Preferably, the mounting groove 28 includes a first mounting groove 281, a second mounting groove 282, and a third mounting groove 283, which are separated from and respectively used for mounting the first magnet structure 51, the magnetic guiding structure 50, and the second magnet structure 52. The first magnet structure 51, the magnetic guiding structure 50, and the second magnet structure 52 are respectively installed into their respective mounting grooves 28. Of course, the first mounting groove 281, the second mounting groove 282, and the third mounting groove 283 can also be connected, and protrusions or other structures can be provided in the mounting groove 28 to limit the first magnet structure 51, the magnetic guiding structure 50, and the second magnet structure 52. In addition, the top plate 25 and the two side plates 24 can also be integrally formed, all of which fall within the protection scope of this utility model.

[0083] Preferably, the arc-extinguishing shroud 21 is made of a gas-generating material, such as PA46, PA66, or POM. The gas-generating material produces gas through high-temperature decomposition, which can effectively cool the electric arc, increase the gas pressure, and accelerate the arc extinguishing.

[0084] like Figure 4 As shown, the arc-extinguishing grid plate 23 includes two grid plate legs 231 spaced apart, and an arc-extinguishing notch 232 is formed between the two grid plate legs 231. The arc-extinguishing notches 232 of the arc-extinguishing grid plates 23 form an arc channel through which the contact portion 33 of the moving contact 32 passes. The position of the grid plate legs 231 corresponds to the magnetic field drive assembly 5. In order to minimize the volume of the arc-extinguishing chamber 2 and save space, the two magnetic field drive assemblies 5 are respectively positioned opposite the ends of the two grid plate legs 231 facing the rotating part 31. In this way, the permanent magnet and the arc-extinguishing grid plate 23 are parallel to each other in the axial direction of the rotating part 31, which can improve the driving force of the magnetic field on the arc and make the structure of the arc-extinguishing chamber 2 more compact and beautiful. Of course, in other embodiments, the two magnetic field drive assemblies 5 can also be slightly offset from the two grid plate legs 231 in the axial direction of the rotating part 31.

[0085] Preferably, the arc-extinguishing grid 23 is a metal grid, including at least one first grid 233 and several second grids 234. The material thickness of the first grid 233 is greater than that of the second grids 234. The first grid 233 is disposed on the side of the second grid 234 near the stationary contact 4.

[0086] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0087] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. An arc extinguishing system comprising a moving contact assembly (3), a stationary contact (4) and an arc chamber (2), the moving contact assembly (3) comprising a rotating part (31) and a moving contact (32), the moving contact (32) being mounted on the rotating part (31), the moving contact (32) being provided with a contact part (33), the rotating part (31) bringing the contact part (33) into contact and out of contact with the stationary contact (4) along an arc-shaped movement path (34), characterized in that, The arc extinguishing chamber (2) comprises an arc extinguishing cover (21), a plurality of arc extinguishing vanes (23) and a magnetic field driving assembly (5), wherein the magnetic field driving assembly (5) comprises: a magnet structure comprising at least one permanent magnet for generating a magnetic field for driving the movement of the arc; a magnetic conducting structure (50) for guiding the magnetic field of the magnet structure so that the magnetic field covers the movement path (34); The magnet structure and the magnetic conducting structure (50) are arranged in an arc shape along the movement path (34) of the contact part (33).

2. The quenching system of claim 1, wherein, The magnet structure comprises a plurality of permanent magnets arranged in a Halbach array.

3. The quenching system of claim 1, wherein, The arc extinguishing chamber (2) comprises two magnetic field driving assemblies (5), which are symmetrically arranged, and the movement path (34) of the contact part (33) is located between the two magnetic field driving assemblies (5).

4. The quenching system of claim 3, wherein, The movable contact (32) comprises two contact plates (35) arranged in parallel on both sides of the stationary contact (4), and each contact plate (35) is provided with the contact part (33), and the contact parts (33) of the two contact plates (35) correspond to the two magnetic field driving assemblies (5) respectively, and the contact parts (33) of the two contact plates (35) can be contacted and separated from both sides of the stationary contact (4) under the driving of the rotating part (31).

5. The quenching system of claim 1, wherein, The magnet structure comprises a first magnet structure (51), which is arranged at one end of the magnetic conducting structure (50) close to the corresponding stationary contact (4), and the first magnet structure (51) comprises at least one permanent magnet.

6. The quenching system of claim 5, wherein, The magnet structure further comprises a second magnet structure (52), which comprises at least one permanent magnet, and the magnetic conducting structure (50) is located between the first magnet structure (51) and the second magnet structure (52).

7. The quenching system according to claim 5 or 6, characterized in that The first magnet structure (51) comprises a plurality of permanent magnets arranged in a Halbach array.

8. The quenching system of claim 6, wherein, The first magnet structure (51) comprises three permanent magnets, namely a front permanent magnet (53) and a rear permanent magnet (55), and a middle permanent magnet (54) arranged between the front permanent magnet (53) and the rear permanent magnet (55), wherein the N poles of the front permanent magnet (53) and the rear permanent magnet (55) are arranged opposite to each other, and the N pole of the middle permanent magnet (54) is arranged towards the movement path (34); or, the S poles of the front permanent magnet (53) and the rear permanent magnet (55) are arranged opposite to each other, and the S pole of the middle permanent magnet (54) is arranged towards the movement path (34).

9. The quenching system of claim 8, wherein, The second magnet structure (52) comprises a second permanent magnet, and the magnetic pole direction of the second permanent magnet is the same as that of the middle permanent magnet (54) of the first magnet structure (51).

10. The quenching system of claim 3, wherein, The arc-extinguishing cover (21) comprises two oppositely arranged side plates (24) and a top plate (25) arranged between the two side plates (24) away from the moving contact (32), the two side plates (24) are respectively spaced apart from the top plate (25), the arc-extinguishing grid (23) is arranged between the two side plates (24), the arc-extinguishing grid (23) is arranged in an arc shape along the movement path (34) of the contact part (33) with the center of rotation of the moving contact (32) as the center, the two magnetic field driving assemblies (5) are respectively arranged on the side of the two side plates (24) away from the corresponding contact part (33) and are respectively located on the side of the arc-extinguishing grid (23) close to the center of rotation of the moving contact (32), the two side plates (24) are respectively provided with oppositely protruding mounting tables (27), and the mounting slots (28) for accommodating the magnetic field driving assemblies (5) are respectively arranged in the mounting tables (27).

11. The arc extinguishing system of claim 10, wherein, The mounting slot (28) comprises a first mounting slot (281), a second mounting slot (282) and a third mounting slot (283) which are separated from each other and are respectively used for mounting the first magnet structure (51), the magnetic conductive structure (50) and the second magnet structure (52).

12. The quenching system of claim 6, wherein, The cross sections of the first magnet structure (51), the magnetic conductive structure (50) and the second magnet structure (52) perpendicular to the axis of the moving contact (32) are all fan ring shapes, the first magnet structure (51), the magnetic conductive structure (50) and the second magnet structure (52) all comprise oppositely arranged outer arc surfaces and inner arc surfaces, and the curvatures of the outer arc surfaces and the inner arc surfaces are the same as the curvature of the movement path (34) of the contact part (33).

13. The quenching system of claim 3, wherein, The arc-extinguishing grid (23) comprises two spaced apart grid legs (231), and an arc-extinguishing gap (232) is formed between the two grid legs (231), the two magnetic field driving assemblies (5) are respectively opposite to the end portions of the two grid legs (231) toward the rotating part (31).

14. The quenching system of claim 1, wherein, The arc-extinguishing grid (23) is a metal grid comprising at least one first grid (233) and a plurality of second grids (234), the thickness of the first grid (233) is greater than that of the second grid (234), and the first grid (233) is arranged on the side of the second grid (234) close to the stationary contact (4).

15. A disconnector, characterized in that An arc-extinguishing system comprising the arc-extinguishing system according to any one of claims 1-14.

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