An arc extinguishing device for a switch

Abstract

The utility model relates to a kind of arc extinguishing device of switch, belong to switchgear technical field.It includes the narrow slit arc extinguishing channel formed between a pair of interval arrangement wall body, and the arc extinguishing device of switch further includes a partition, and the partition is detachably connected between the end of the pair of wall body and the end of the end of the contact system of switch, to constitute the bottom plate of narrow slit arc extinguishing channel.The advantages are: it is convenient to maintain, with scalability, bring the advantage of economy and use flexibility, can significantly improve the electrical life of switch.

Description

Technical Field

[0001] This utility model belongs to the field of switch electrical technology, and specifically relates to an arc extinguishing device for a switch. Background Technology

[0002] Switchgear is an indispensable key device in power systems, and its core functions are mainly reflected in two aspects: first, control, which involves putting specific power equipment or lines into or out of operation according to the needs of power grid operation and dispatch, so as to achieve flexible control of the system operation mode; second, protection, which involves quickly and reliably disconnecting the faulty part from the power grid when power equipment or lines experience faults such as short circuits or overloads, thereby ensuring the normal operation of the fault-free parts of the system, preventing the accident from escalating, and improving the reliability and stability of power supply. Disconnect switches, as an important type of switchgear, primarily function to create a visible break in the circuit with a sufficient safety distance to ensure the absolute safety of equipment during maintenance or shutdown. However, traditional disconnect switches are typically designed to provide a clear disconnection point and are not designed to interrupt large load currents, especially high-energy arcs.

[0003] With the rapid development of modern power systems and the continuous improvement of power grid voltage levels, the arc energy of related components during disconnection is increasing, placing higher demands on arc extinguishing devices. The large arc energy leads to the ablation of the bottom of the narrow arc extinguishing channel in the arc extinguishing device, resulting in prominent problems such as short electrical life. Moreover, the occurrence of this phenomenon necessitates the replacement of the entire arc extinguishing device, causing waste of other components, poor economic efficiency, and hindering cost reduction and energy saving.

[0004] In view of the above-mentioned existing technology, it is necessary to improve the arc extinguishing structure of existing switching electrical appliances. To this end, the applicant has made a useful design, and the technical solution to be introduced below is produced in this context. Utility Model Content

[0005] The purpose of this utility model is to provide an arc-extinguishing device for a switch, which is easy to maintain, expandable, and brings advantages in economy and flexibility of use, and can significantly improve the electrical life of the switch.

[0006] The purpose of this invention is to provide an arc-extinguishing device for a switch, comprising a narrow slit arc-extinguishing channel formed between a pair of spaced-apart walls. The arc-extinguishing device further comprises a partition plate detachably connected between the ends of the pair of walls away from the contact system of the switch to form the base plate of the narrow slit arc-extinguishing channel.

[0007] In one specific embodiment of this utility model, the contact system of the switch includes a stationary contact and a moving contact that is in contact with or separate from the stationary contact. The arc-extinguishing device has a structure that is symmetrical with respect to the moving plane of the moving contact. It includes an insulating cover, which includes a central arc-blocking plate and a pair of arc-blocking plates disposed on both sides of the central arc-blocking plate. The central arc-blocking plate and one of the arc-blocking plates on both sides constitute the pair of spaced-apart walls. The narrow slit arc-extinguishing channels are respectively formed between the central arc-blocking plate and the pair of arc-blocking plates.

[0008] In another specific embodiment of this utility model, a groove 1 is recessed on the central arc-blocking plate and a corresponding groove 2 is recessed on the pair of arc-blocking plates, with the two sides of the partition plate in the width direction respectively accommodated in the groove 1 and the groove 2.

[0009] In another specific embodiment of this utility model, on the side away from the moving contact, the central arc-blocking plate and the pair of arc-blocking plates are respectively connected by a bottom wall, and the partition is detachably snapped onto the bottom wall.

[0010] In another specific embodiment of this utility model, the partition is provided with a buckle at one end in the length direction and a limiting boss at the other end. The buckle is engaged with one end of the bottom wall in the length direction, and the limiting boss abuts against the end of the other end of the bottom wall in the length direction.

[0011] In another specific embodiment of this utility model, the insulating cover is made of a gas-generating material, and the partition is made of a gas-generating material or an arc-resistant material.

[0012] In a further specific embodiment of this utility model, on the side away from the moving contact, the distance between the central arc-blocking plate and the arc-stopping plate gradually decreases and then they are connected to each other to form the bottom wall.

[0013] In another specific embodiment of the present invention, on the side away from the moving contact, the central arc-blocking plate and the arc-stopping plate are connected by a connecting plate, which constitutes the bottom wall.

[0014] In a further specific embodiment of the present invention, the arc extinguishing device further includes a magnetic component, which includes an intermediate permanent magnet disposed in the central arc-blocking plate. The internal magnetic field direction of the intermediate permanent magnet is parallel to the moving plane of the moving contact, so that the electric arc enters one of the narrow slit arc extinguishing channels.

[0015] In another specific embodiment of this utility model, several arc-extinguishing plates are spaced apart on the surface of the partition facing the moving contact.

[0016] This invention establishes a detachable structure between the bottom wall panel (the partition) of the narrow-slit arc-extinguishing channel and a pair of side walls, enabling convenient replacement of key vulnerable components. Specifically, when the bottom wall panel (the partition) of the narrow-slit arc-extinguishing channel is damaged by an electric arc, it can be easily removed from the pair of side walls for replacement, facilitating maintenance. Furthermore, for switches of different current levels, partitions made of gas-generating or arc-resistant materials can be flexibly replaced, achieving scalability and bringing advantages in terms of flexibility and economy. By using arc-resistant materials for the partition, a composite arc-extinguishing chamber design combining a gas-generating material insulating cover and a detachable arc-resistant partition is achieved, effectively solving the technical problem of the bottom of the narrow-slit arc-extinguishing channel being easily damaged by an electric arc in high-voltage switches, and significantly improving the electrical life of the switch. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the switch described in this utility model; Figure 2 This is a schematic diagram of the arc-extinguishing device described in this utility model; Figure 3 This is an assembly diagram of the insulating cover, magnetic component, and partition plate described in this utility model; Figure 4 This is a schematic diagram of the structure of the partition described in this utility model; Figure 5 This is a side view of the insulating cover described in this utility model; Figure 6 This is a schematic diagram of the arc movement when current flows from the moving contact to the stationary contact in this utility model; Figure 7 This is a schematic diagram of the movement of current when it flows from the stationary contact to the moving contact in this utility model.

[0018] In the diagram: 1. Stationary contact; 2. Moving contact; 3. Arc extinguishing device; 30. Opening; 301. Cavity; 302. Side plate recessed cavity; 31. Insulating cover; 311. Central arc-blocking plate; 3111. Groove I; 312. Arc-blocking plate; 3121. Groove II; 313. Narrow slit arc-extinguishing channel; 314. Bottom wall; 315. Insulating back plate; 32. Magnetic assembly; 321. Permanent magnet; 322. Side permanent magnet; 323. Magnetic conductive side plate; 324. Magnetic conductive back plate; 33. Partition; 331. Arc extinguishing plate; 332. Buckle; 333. Limiting boss; 4. Outer shell. Detailed Implementation

[0019] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0020] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0021] Please see Figure 1 This utility model relates to an arc-extinguishing device for a switch. One embodiment of the arc-extinguishing device is the arc-extinguishing device 3 shown in the figure, which is installed in the switch. The switch also includes a housing 4, a stationary contact 1 fixedly disposed within the housing 4, and a moving contact 2 rotatably disposed within the housing 4 and in contact with and separating from the stationary contact 1. The arc-extinguishing device 3 is used to extinguish the electric arc generated between the moving contact 2 and the stationary contact 1 when they separate.

[0022] The switch described in this utility model, taking a double-break disconnector as an example, has a pair of stationary contacts 1 symmetrically arranged inside the housing 4, with the rotation center of the moving contact 2. The moving contact 2 includes a rotating bracket and a pair of moving contact guide rods symmetrically extending from the circumferential side of the rotating bracket. The pair of moving contact guide rods respectively engage and disengage with the stationary contacts 1. Corresponding to this double-break disconnector, the arc-extinguishing device 3 also has a pair, respectively corresponding to the pair of stationary contacts and the moving contact. When the moving contact 2 rotates relative to the housing 4 towards the side away from the stationary contact 1, it can cooperate with the stationary contact 1 to achieve opening; when the moving contact 2 rotates relative to the housing 4 towards the side closer to the stationary contact 1, it can cooperate with the stationary contact 1 to achieve closing. The moving contact 2 rotates to form a moving plane, and during its movement, the moving contact 2 forms an arc-shaped movement path.

[0023] See Figure 2 and combined Figure 1 The arc extinguishing device 3 has a structure that is symmetrical with respect to the moving plane of the moving contact 2. It has a three-sided enclosed structure and forms an opening 30 facing the moving contact 2. The stationary contact 1 and the end of the moving contact guide rod contact or separate within the opening 30, that is, an arc-shaped movement path of the moving contact 2 is formed within the opening 30.

[0024] See Figure 2 and Figure 3The arc-extinguishing device 3 includes an insulating cover 31, which comprises a central arc-blocking plate 311 and a pair of arc-blocking plates 312 disposed on both sides of the central arc-blocking plate 311. The arc-blocking plates 312 are symmetrically arranged with respect to the moving plane of the moving contact 2, and the central arc-blocking plate 311 is located on the moving plane of the moving contact 2. The two sides of the central arc-blocking plate 311 and their respective corresponding arc-blocking plates 312 can be arranged parallel to each other, as shown in this embodiment. Of course, it can also be configured such that the distance between the two sides of the central arc-blocking plate 311 near the moving contact 2 and the corresponding arc-blocking plate 312 is greater than the distance between the two sides of the central arc-blocking plate 311 away from the moving contact 2 and the corresponding arc-blocking plate 312. In this case, the insulating cover 31 presents a "W" shaped structure. One of the central arc-blocking plate 311 and the two side arc-blocking plates 312 forms a pair of spaced-apart walls, and the other of the central arc-blocking plate 311 and the two side arc-blocking plates 312 forms another pair of spaced-apart walls, i.e., see [link to relevant documentation]. Figure 2 and Figure 3 The central arc-blocking plate 311 and the left arc-blocking plate 312 form a pair of spaced-apart walls, and a narrow-slit arc-extinguishing channel 313 is formed between them. The central arc-blocking plate 311 and the right arc-blocking plate 312 form another pair of spaced-apart walls, and another narrow-slit arc-extinguishing channel 313 is formed between them. That is, the arc-extinguishing device 3 of this embodiment has two narrow-slit arc-extinguishing channels 313.

[0025] See Figure 3 and Figure 4 As an innovation of this utility model, the arc extinguishing device 3 of the switch also includes a partition 33, which is detachably connected between the ends of the contact system of the two walls away from the switch to form the bottom plate of the narrow slit arc extinguishing channel 313.

[0026] A first groove 3111 is recessed on the central arc-blocking plate 311, and a second groove 3121 is correspondingly recessed on the pair of arc-blocking plates 312. The two sides of the partition plate 33 in the width direction are respectively accommodated in the first groove 3111 and the second groove 3121. The first groove 3111 on the central arc-blocking plate 311 should be located at the end of the central arc-blocking plate 311 away from the moving contact 2. Similarly, the second groove 3121 on the arc-blocking plate 312 should be located at the end of the central arc-blocking plate 311 away from the moving contact 2, so that the partition plate 33 is located on the back of the arc-extinguishing device 3, that is, on the side of the contact system of the arc-extinguishing device 3 facing away from the switch. The central arc-blocking plate 311, the one-sided arc-blocking plate 312 and the partition plate 33 form a "Π" shaped structure surrounding the narrow slit arc-extinguishing channel 313.

[0027] The partition 33 extends along the direction of movement of the moving contact 2, and arc-extinguishing plates 331 are spaced apart on the surface facing the moving contact 2, i.e., the upper surface in the figure. The arc-extinguishing plates 331 on the partition 33 can further stretch the arc and increase the arc voltage, thereby making it more conducive to the accelerated extinguishing of the arc.

[0028] See you later Figure 2 and Figure 3 On the side away from the moving contact 2, a bottom wall 314 is formed between the central arc-blocking plate 311 and a pair of arc-blocking plates 312. The central arc-blocking plate 311 and the pair of arc-blocking plates 312 are connected by the bottom wall 314, and the partition plate 33 is engaged with the bottom wall 314. In this embodiment, the two sides of the central arc-blocking plate 311 are arranged parallel to each other with their respective corresponding arc-blocking plates 312, and the central arc-blocking plate 311 and the arc-blocking plates 312 are connected by a connecting plate, which constitutes the bottom wall 314. If the insulating cover 31 has the above-mentioned "W"-shaped structure, then in the direction away from the moving contact 2, the distance between the central arc-blocking plate 311 and the arc-blocking plates 312 gradually decreases and then connects with each other to form the bottom wall 314.

[0029] See Figure 4 The partition 33 has a buckle 332 at one end in the length direction and a limiting boss 333 at the other end. The buckle 332 engages with one end of the bottom wall 314 in the length direction, and the limiting boss 333 abuts against the end of the bottom wall 314 in the length direction.

[0030] See you later Figure 2 and Figure 3 Furthermore, the central arc-blocking plate 311 has a cavity 301 formed therein, and the pair of arc-blocking plates 312 have side plate embedding cavities 302. The insulating cover 31 also includes an insulating back plate 315 connecting the bottom of the pair of arc-blocking plates 312, and the insulating back plate 315 is spaced apart from the bottom wall 314 to form a back plate embedding cavity. Preferably, the insulating cover 31 is integrally formed by the central arc-blocking plate 311, the arc-blocking plates 312 and the insulating back plate 315.

[0031] Furthermore, the arc-extinguishing device 3 also includes a magnetic assembly 32, which includes an intermediate permanent magnet 321 housed within the cavity 301 of the central arc-blocking plate 311. In this embodiment, the intermediate permanent magnet 321 is elongated, with its side facing the moving contact 2 being planar. Alternatively, the side of the intermediate permanent magnet 321 facing the moving contact 2 can extend in an arc shape closely following the movement trajectory of the moving contact 2, forming an arc-shaped extension surface. The size of this arc-shaped extension surface should be close to the radius of rotation of the moving contact 2. The magnetic assembly 32 also includes a pair of side permanent magnets 322, a pair of magnetically conductive side plates 323, and a pair of magnetically conductive back plates 324. The magnetically conductive side plate 323 is embedded in the side plate embedding cavity 302 at the end near the moving contact 2, and the side permanent magnet 322 is embedded in the side plate embedding cavity 302 at the end away from the moving contact 2. The magnetically conductive side plate 323 and the side permanent magnet 322 are arranged close together in the extension direction of the moving contact guide rod. The pair of magnetically conductive back plates 324 are accommodated in the back plate embedding cavity and are correspondingly connected between the intermediate permanent magnet 321 and the pair of side permanent magnets 322.

[0032] See Figure 6 and Figure 7 In this embodiment, the direction from the opening 30 of the arc-extinguishing device to the insulating back plate 315 is the depth direction of the arc-extinguishing device. Therefore, the N and S poles of the intermediate permanent magnet 321 are arranged along this depth direction, with the end near the opening 10 being the N pole and the end near the insulating back plate 315 being the S pole. Similarly, the N and S poles of the pair of side permanent magnets 12 are arranged along this depth direction, but the end of the pair of side permanent magnets 12 near the opening 10 is the S pole, and the end near the insulating back plate 315 is the N pole. The intermediate permanent magnet 321 is located outside the arc-shaped movement path of the moving contact 2, that is, on the side of the moving contact 2 away from its rotation center.

[0033] In this embodiment, because the internal magnetic fields of the intermediate permanent magnet 321 and the side permanent magnet 322 are opposite in direction and both parallel to the moving plane of the moving contact 2, the arc enters one of the narrow slit arc-extinguishing channels 313. When the current flows from the moving contact 2 to the stationary contact 1, the current direction is perpendicular to the paper and inward. The intermediate permanent magnet 321 and the left side permanent magnet 322 generate a magnetic field. A magnetic circuit is constructed by the intermediate permanent magnet 321, the left magnetically conductive side plate 323, the left side permanent magnet 322, and the left magnetically conductive back plate 324. Within this magnetic field, the arc experiences the Lorentz force F in the direction shown in the diagram. Figure 6As shown, the electric arc enters the narrow slit arc-extinguishing channel 313 on the left side under the drive of the Lorentz magnetic force F; when the current flows from the stationary contact 1 to the moving contact 2, the current direction is perpendicular to the paper and outwards. The central permanent magnet 321 and the right-side side permanent magnet 322 generate a magnetic field. A magnetic circuit is constructed by the central permanent magnet 321, the right-side magnetically conductive side plate 323, the right-side side permanent magnet 322, and the right-side magnetically conductive back plate 324. Within this magnetic field, the electric arc is subjected to the Lorentz magnetic force F in the direction shown in the diagram. Figure 7 As shown, the electric arc is driven by the Lorentz magnetic force F into the narrow slit arc-extinguishing channel 313 on the right. This demonstrates that the driving, elongation, and extinguishing of the electric arc are independent of the direction of the current.

[0034] In this embodiment, the insulating cover 31 is made of a gas-generating material; the partition 33 is made of an arc-resistant material, and the insulating cover 31 and the partition 33 are fused together to form a composite material arc-extinguishing chamber. The insulating cover 31, on the one hand, provides support for the central permanent magnet 321, the side permanent magnets 322, the magnetically conductive side plate 323, and the magnetically conductive back plate 324, facilitating the installation and fixation of the magnetic assembly 32; on the other hand, a narrow-slit arc-extinguishing channel 313 is formed between the arc-blocking plate 312 and the central arc-blocking plate 311 of the insulating cover 31. This narrow-slit arc-extinguishing channel 313 is located on both sides of the central permanent magnet 321 and extends along the movement direction of the moving contact 2. It is situated on the periphery of both sides of the moving contact 2, allowing the arc generated when the moving contact 2 and the stationary contact 1 separate to pass through, thus cooperating with the magnetic field to guide and extinguish the arc.

[0035] In this embodiment, the baffle 33 is made of an arc-resistant material, which can prevent the bottom of the narrow-slit arc-extinguishing channel 313 from being burned by an electric arc. This effectively solves the technical problem that the bottom of the narrow-slit arc-extinguishing channel in high-voltage switches is easily burned by an electric arc, significantly improving the electrical life of the switch. The detachable structure of the baffle 33 facilitates replacement and maintenance, bringing economic advantages. This convenience is further reflected in the fact that since the baffle 33 only uses a gas-generating material, if the baffle 33 is burned by an electric arc, it can simply be removed from the pair of side walls for replacement. This achieves convenient replacement of key vulnerable components and also preserves undamaged parts in the arc-extinguishing device 3, reducing costs and saving energy. In addition, in the above embodiment, the baffle 33 adopts a detachable structure, which allows for the installation or non-installation of the baffle 33 according to different current levels of the switch, or the baffle 33 can be flexibly replaced with a gas-generating material or an arc-resistant material, achieving scalability and thus bringing advantages in terms of flexibility and economy.

[0036] Of course, the arc extinguishing device 3 of this utility model is not limited to the above embodiment which has two narrow slit arc extinguishing channels 313. It can also have a structure in which only a pair of spaced-apart walls form a narrow slit arc extinguishing channel 313. The side of the pair of spaced-apart walls away from the moving contact 2, that is, the back of the arc extinguishing device 3, can also be connected to the pair of walls only by the installation of the partition plate 33, instead of the bottom wall 314 described in the above embodiment. That is, only the bottom of the narrow slit arc extinguishing channel 313 is separated by the partition plate 33.

Claims

1. An arc-extinguishing device for a switch, comprising a narrow arc-extinguishing channel (313) formed between a pair of spaced-apart walls, characterized in that: The arc-extinguishing device (3) of the switch further includes a partition (33), which is detachably connected between the ends of the contact system of the two walls away from the switch to form a base plate of a narrow slit arc-extinguishing channel (313); the contact system of the switch includes a stationary contact (1) and a moving contact (2) that contacts or separates from the stationary contact (1); the arc-extinguishing device (3) has a structure symmetrical with respect to the plane of motion of the moving contact (2), and includes an insulating cover (31); the insulating cover (31) includes a central arc-blocking plate (311) and a series of arc-extinguishing devices disposed on both sides of the central arc-blocking plate (311). For the arc-blocking plate (312), the central arc-blocking plate (311) and one of the two side arc-blocking plates (312) respectively constitute a pair of spaced-apart walls, and the narrow slit arc-extinguishing channel (313) is formed between the central arc-blocking plate (311) and the pair of arc-blocking plates (312); a groove one (3111) is recessed on the central arc-blocking plate (311) and a corresponding groove two (3121) is recessed on the pair of arc-blocking plates (312), and the two sides of the partition plate (33) in the width direction are respectively accommodated in the groove one (3111) and the groove two (3121).

2. The arc-extinguishing device for a switch according to claim 1, characterized in that: On the side away from the moving contact (2), the central arc-blocking plate (311) and the pair of arc-blocking plates (312) are connected by a bottom wall (314), and the partition plate (33) is detachably snapped onto the bottom wall (314).

3. The arc-extinguishing device for a switch according to claim 2, characterized in that: The partition (33) has a buckle (332) at one end in the length direction and a limiting boss (333) at the other end. The buckle (332) engages with one end of the bottom wall (314) in the length direction, and the limiting boss (333) abuts against the end of the bottom wall (314) in the length direction.

4. The arc-extinguishing device for a switch according to claim 3, characterized in that: The insulating cover (31) is made of a gas-generating material, and the partition (33) is made of a gas-generating material or an arc-resistant material.

5. The arc-extinguishing device for a switch according to claim 2, characterized in that: On the side away from the moving contact (2), the distance between the central arc-blocking plate (311) and the arc-blocking plate (312) gradually decreases and then connects to form the bottom wall (314).

6. The arc-extinguishing device for a switch according to claim 2, characterized in that: On the side away from the moving contact (2), the central arc-blocking plate (311) and the arc-blocking plate (312) are connected by a connecting plate, which forms the bottom wall (314).

7. The arc-extinguishing device for a switch according to claim 1, characterized in that: The arc extinguishing device (3) further includes a magnetic component (32), which includes an intermediate permanent magnet (321) disposed in the central arc-blocking plate (311). The direction of the internal magnetic field of the intermediate permanent magnet (321) is parallel to the moving plane of the moving contact (2), so that the electric arc enters one of the narrow slit arc extinguishing channels (313).

8. The arc-extinguishing device for a switch according to claim 1, characterized in that: Several arc-extinguishing plates (331) are spaced apart on the surface of the partition (33) facing the moving contact (2).

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