A switch body for an arc-extinguishing chamber and a DC disconnecting switch

Abstract

This utility model belongs to the field of disconnecting switches, specifically relating to an arc-extinguishing chamber and the switch body of the disconnecting switch. It includes a frame, a magnetic conductive element, a permanent magnet, and two sets of arc-extinguishing grid assemblies. Two arc-extinguishing holes are provided on both sides of the magnetic conductive element within the frame. The two sets of arc-extinguishing grid assemblies are respectively disposed within the two arc-extinguishing holes, forming an arc-extinguishing space between the two sets of arc-extinguishing grid assemblies that communicates with the two arc-extinguishing holes. A magnetic conductive plate is provided on the frame, covering the permanent magnet and the two sets of arc-extinguishing grid assemblies. The arc-extinguishing chamber adopts a magnetic blowout structure design, forming a closed magnetic field between the permanent magnet, the magnetic conductive plate, and the magnetic conductive element. The permanent magnet concentrates the magnetic field within the arc-extinguishing space through the magnetic conductive plate and the magnetic conductive element, reducing magnetic field leakage, improving magnetic field utilization, and enhancing magnetic field strength. This effectively improves arc control capability and arc voltage, thus facilitating rapid arc extinguishing and enhancing the arc-extinguishing performance of the disconnecting switch body.

Description

Technical Field

[0001] This utility model belongs to the field of disconnecting switch technology, specifically relating to an arc-extinguishing chamber and a switch body for a DC disconnecting switch. Background Technology

[0002] A disconnecting switch is a device that isolates a de-energized section from a energized section, creating a clear disconnect point to isolate faulty equipment or facilitate maintenance during power outages. During electrical equipment maintenance, isolating the equipment from the power source creates a clear disconnect point, preventing safety accidents. Disconnecting switches are widely used in power distribution and automation systems in construction, power, petrochemical, and other industries. With the development and utilization of clean energy, the installed capacity and proportion of photovoltaic power generation in the power system are increasing year by year. As an important control and protection component on the DC side of photovoltaic power generation, the disconnecting switch is responsible for connecting and disconnecting current. During disconnection, the separation of the moving and stationary contacts generates an electric arc. This arc not only severely damages the contacts but also prolongs the circuit disconnection time, posing a safety hazard to the disconnecting switch.

[0003] In the existing technology, the arc-extinguishing chamber has defects such as uneven magnetic field or insufficient strength. The arc may stagnate near the contact and cannot quickly enter the arc-extinguishing grid of the arc-extinguishing chamber. It cannot be cooled and cut by the arc-extinguishing grid, resulting in a low arc voltage and failure to achieve forced zero crossing of DC current, thus leading to poor arc extinguishing effect of the disconnecting switch. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a switch body for an arc-extinguishing chamber and a DC disconnecting switch, which can accelerate the arc into the arc-extinguishing grid, effectively increase the arc voltage, and achieve rapid arc extinguishing.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an arc-extinguishing chamber includes a frame, a magnetic conductive component disposed within the frame, a permanent magnet disposed on the magnetic conductive component, and two sets of symmetrically distributed arc-extinguishing grid plate assemblies. Two arc-extinguishing holes are provided on both sides of the magnetic conductive component within the frame. The two sets of arc-extinguishing grid plate assemblies are respectively disposed within the two arc-extinguishing holes, and an arc-extinguishing space is formed between the two sets of arc-extinguishing grid plate assemblies that communicates with the two arc-extinguishing holes. A magnetic conductive plate is provided on the frame to cover the permanent magnet and the two sets of arc-extinguishing grid plate assemblies.

[0006] In some embodiments, two arc-blocking plates are provided on the frame between the two sets of arc-extinguishing grid plate assemblies and the magnetic plate. The two arc-blocking plates are provided with exhaust grooves on the side facing the two sets of arc-extinguishing grid plate assemblies, and the frame is provided with two exhaust holes that communicate with the exhaust grooves of the two arc-blocking plates.

[0007] In some embodiments, each group of arc-extinguishing grid assembly includes a plurality of arc-extinguishing grids arranged at intervals and an arc-blocking plate disposed on both sides of the plurality of arc-extinguishing grids. An arc-extinguishing channel is formed between the plurality of arc-extinguishing grids, and the arc-extinguishing channel connects the arc-extinguishing space and the exhaust groove.

[0008] In some embodiments, a receiving groove is provided between two corresponding arc-extinguishing holes within the frame, and the magnetic conductive component and permanent magnet are stacked and disposed within the receiving groove.

[0009] In some embodiments, the cross-sectional shape of the magnetic conductor is rectangular.

[0010] In some embodiments, two slots are respectively provided on the outer side of the two sets of arc-extinguishing grid plate assemblies on the frame, and the magnetic plate has two magnetic plates at both ends that are respectively inserted into the two slots.

[0011] A DC disconnect switch body includes a housing, a moving contact assembly and a stationary contact rotatably disposed within the housing, and an arc-extinguishing chamber disposed within the housing at the corresponding stationary contact position. An exhaust channel is provided on the housing at the corresponding position of the arc-extinguishing chamber, and an arc-extinguishing plate is disposed within the exhaust channel.

[0012] In some embodiments, one end of the stationary contact has an arc-inducing portion extending into the arc-extinguishing space of the arc-extinguishing chamber.

[0013] In some embodiments, the contact portion of the stationary contact is provided with an arc-shaped groove on the side facing the moving contact assembly, the arc-shaped groove extending from the contact portion of the stationary contact towards the arc-drawing portion.

[0014] In some embodiments, the moving contact assembly includes a main shaft rotatably disposed within a housing and two contact plates linked to the main shaft. A contact space is formed between the two contact plates to contact the stationary contact. Arc-inducing plates are respectively disposed on the side of the two contact plates facing the two sets of arc-extinguishing grid plate assemblies.

[0015] The beneficial effects of this invention are as follows: The arc-extinguishing chamber adopts a magnetic blowout structure design, forming a closed magnetic field between the permanent magnet, the magnetic guide plate, and the magnetic guide components. The permanent magnet concentrates the magnetic field within the arc-extinguishing space through the magnetic guide plate and magnetic guide components, reducing magnetic field leakage, improving magnetic field utilization, and enhancing magnetic field strength, thereby effectively improving the arc control capability. The closed magnetic field provides a more uniform magnetic field distribution, preventing random arc diffusion or stagnation. The arc is forcibly stretched into a longer shape, allowing it to quickly enter the arc-extinguishing grid, where it is cooled and cut by multiple arc-extinguishing grids, accelerating energy dissipation and effectively increasing the arc voltage, thus facilitating rapid arc extinguishing. The arc-initiating part of the stationary contact and the arc-initiating plates on the moving contact can quickly introduce the arc into the arc-extinguishing chamber, preventing the arc from burning the stationary and moving contacts, thereby improving the arc-extinguishing performance of the disconnecting switch body. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a perspective view of the arc-extinguishing chamber according to an embodiment of the present invention;

[0018] Figure 2 This is a cross-sectional view of the arc-extinguishing chamber according to an embodiment of the present invention;

[0019] Figure 3 This is an exploded view of the arc-extinguishing chamber according to an embodiment of the present invention;

[0020] Figure 4 This is an exploded view of the switch body according to an embodiment of the present invention;

[0021] Figure 5 This is a perspective view of the stationary contact of an embodiment of the present utility model;

[0022] Figure 6 This is a perspective view of the moving contact assembly according to an embodiment of the present utility model. Detailed Implementation

[0023] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0025] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0027] like Figure 1-4 As shown, an arc-extinguishing chamber 10 includes a frame 1, a magnetic conductor 2 disposed within the frame 1, a permanent magnet 3 disposed on the magnetic conductor 2, and two sets of arc-extinguishing grid plate assemblies 4 symmetrically distributed. Two arc-extinguishing holes 11 are disposed within the frame 1 corresponding to both sides of the magnetic conductor 2. The two sets of arc-extinguishing grid plate assemblies 4 are respectively disposed within the two arc-extinguishing holes 11, and an arc-extinguishing space 400 communicating with the two arc-extinguishing holes 11 is formed between the two sets of arc-extinguishing grid plate assemblies 4. A magnetic conductor plate 5 is disposed on the frame 1 covering the permanent magnet 2 and the two sets of arc-extinguishing grid plate assemblies 4.

[0028] like Figure 2 and 3 As shown, two arc-blocking plates 6 are arranged on the frame 1 between the two sets of arc-extinguishing grid plate assemblies 4 and the magnetic guide plate 5. Each of the two arc-blocking plates 6 has an exhaust groove 61 on its side facing the two sets of arc-extinguishing grid plate assemblies 4. The frame 1 has two exhaust holes 12 that communicate with the exhaust grooves 61 of the two arc-blocking plates 6. The arc-blocking plates serve to block the arc, and their exhaust grooves guide the high-pressure gas in the arc-extinguishing chamber to escape, effectively enhancing the magnetic blowing effect and thus improving the arc-extinguishing efficiency. Each set of arc-extinguishing grid plate assemblies 4 includes multiple arc-extinguishing grid plates 41 arranged at intervals and arc-blocking plates 42 arranged on both sides of the multiple arc-extinguishing grid plates 41. An arc-extinguishing channel 401 is formed between the multiple arc-extinguishing grid plates 41, connecting the arc-extinguishing space 400 and the exhaust groove 61. The two sets of arc-extinguishing grid assemblies adopt a multi-grid structure design, allowing the arc to be cooled and cut by multiple arc-extinguishing grids, which is beneficial for rapid arc extinguishing. Furthermore, the arc-extinguishing grid assembly adopts a modular structure design, facilitating modular assembly of the arc-extinguishing grid assembly and the frame. Within the frame 1, a receiving groove 13 is provided between the two arc-extinguishing holes 11, and the magnetic conductive component 2 and permanent magnet 3 are stacked within the receiving groove 13. The stacked distribution of the magnetic conductive component and permanent magnet forms a closed magnetic circuit. The magnetic conductive component forms a low magnetic resistance path, guiding the magnetic field of the permanent magnet to concentrate and cover the arc-extinguishing space, reducing magnetic field leakage and thus improving arc-extinguishing efficiency. The cross-sectional shape of the magnetic conductive component 2 is rectangular. The rectangular structure design of the magnetic conductive component helps to form a more uniform magnetic field distribution within the arc-extinguishing chamber, avoiding localized weak magnetic field areas, ensuring consistent arc force, thereby enhancing arc control capability and improving arc-extinguishing efficiency. Two slots 14 are respectively provided on the outer side of the two sets of arc-extinguishing grid plate assemblies 4 on the frame 1. The magnetic plate 5 has two magnetic sheets 51 at both ends, which are respectively inserted into the two slots 14. The magnetic sheets cover the outer side of the two sets of arc-extinguishing grid plate assemblies, thereby enhancing the magnetic field strength in the arc-extinguishing space and improving the arc-extinguishing performance.

[0029] like Figure 4-6As shown, a DC disconnect switch body includes a housing 7, a moving contact assembly 8 and a stationary contact 9 rotatably disposed within the housing 7, and an arc-extinguishing chamber 10 corresponding to the stationary contact 9 disposed within the housing 7. An exhaust channel 71 is provided on the housing 7 corresponding to the arc-extinguishing chamber 10, and an arc-extinguishing plate 72 is disposed within the exhaust channel 71. The exhaust channel on the housing, connected to the exhaust port of the arc-extinguishing chamber, enhances the magnetic blow-out effect of the arc-extinguishing chamber, facilitating rapid arc extinguishing. Furthermore, the arc-extinguishing plate extinguishes residual arcs, reducing arcing within the switch body. One end of the stationary contact 9 has an arc-initiating portion 91 extending into the arc-extinguishing space 61 of the arc-extinguishing chamber 10. The arc-initiating portion rapidly introduces the arc into the arc-extinguishing chamber, accelerating arc extinguishing. The arc-initiating portion also prevents the arc from burning the contact portion of the stationary contact, thus extending the service life of the stationary contact.

[0030] like Figure 5 As shown, the contact portion 92 of the stationary contact 9 is provided with an arc-shaped groove 93 on the side facing the moving contact assembly 8. The arc-shaped groove 93 extends from the contact portion 92 of the stationary contact 9 towards the arc-inducing portion 91. When the moving contact and the stationary contact are disconnected, the arc-shaped groove can increase the gap between the moving contact and the stationary contact, forcibly elongating the arc, accelerating energy dissipation, and improving arc extinguishing performance.

[0031] like Figure 6 As shown, the moving contact assembly 8 includes a main shaft 81 rotatably disposed within the housing 7 and two contact plates 82 linked to the main shaft 81. A contact space 820 is formed between the two contact plates 82, which contacts the stationary contact 9. Arc-initiating plates 83 are respectively disposed on the side of the two contact plates 82 facing the two sets of arc-extinguishing grid assemblies 4. The arc-initiating plates can quickly introduce the arc into the arc-extinguishing chamber, which is beneficial to accelerating the extinguishing of the arc. Furthermore, the arc-initiating plates can prevent the arc from burning the moving contact plates, which is beneficial to improving the service life of the moving contact plates.

[0032] The arc-extinguishing chamber employs a magnetic blowout structure design. A closed magnetic field is formed between the permanent magnet, the magnetic guide plate, and the magnetic guide components. The permanent magnet concentrates the magnetic field within the arc-extinguishing space through the magnetic guide plate and components, reducing magnetic field leakage, improving magnetic field utilization, and enhancing magnetic field strength, thereby effectively improving arc control capability. The closed magnetic field provides a more uniform magnetic field distribution, preventing random arc diffusion or stagnation. The arc is forcibly stretched into a longer shape, allowing it to quickly enter the arc-extinguishing grid. Multiple arc-extinguishing grids cool and cut the arc, accelerating energy dissipation and effectively increasing the arc voltage, thus facilitating rapid arc extinguishing. The arc-initiating part of the stationary contact and the arc-initiating plates on the moving contact quickly introduce the arc into the arc-extinguishing chamber, preventing arc erosion of the stationary and moving contacts, thereby improving the arc-extinguishing performance of the disconnector switch body.

[0033] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. An arc quenching chamber characterized by: The device includes a frame, a magnetic conductive component disposed within the frame, a permanent magnet disposed on the magnetic conductive component, and two symmetrically distributed sets of arc-extinguishing grid plate assemblies. Two arc-extinguishing holes are provided on both sides of the magnetic conductive component within the frame. The two sets of arc-extinguishing grid plate assemblies are respectively disposed in the two arc-extinguishing holes, and an arc-extinguishing space is formed between the two sets of arc-extinguishing grid plate assemblies that communicates with the two arc-extinguishing holes. A magnetic conductive plate is provided on the frame to cover the permanent magnet and the two sets of arc-extinguishing grid plate assemblies.

2. The arc chute according to claim 1, characterized in that: Two arc-blocking plates are provided on the frame between the two sets of arc-extinguishing grid plate assemblies and the magnetic plate. Each of the two arc-blocking plates has an exhaust groove on the side facing the two sets of arc-extinguishing grid plate assemblies. The frame is provided with two exhaust holes that are connected to the exhaust grooves of the two arc-blocking plates.

3. The arc chute of claim 2, wherein: Each set of arc-extinguishing grid assembly includes multiple arc-extinguishing grids arranged at intervals and arc-blocking plates disposed on both sides of the multiple arc-extinguishing grids. An arc-extinguishing channel is formed between the multiple arc-extinguishing grids, and the arc-extinguishing channel connects the arc-extinguishing space and the exhaust groove.

4. The arc chute according to claim 1 or 2 or 3, characterized in that: A receiving groove is provided between two corresponding arc-extinguishing holes within the frame, and the magnetic conductive component and permanent magnet are stacked and arranged within the receiving groove.

5. The arc chute of claim 1, wherein: The cross-sectional shape of the magnetic conductive component is square.

6. The arc chute of claim 1, wherein: The frame has two slots on the outer side corresponding to the two sets of arc-extinguishing grid plate assemblies, and the magnetic plate has two magnetic plates at both ends that are inserted into the two slots respectively.

7. A switch body for a DC disconnect switch, characterized in that: The device includes a housing, a moving contact assembly rotatably disposed within the housing, a stationary contact, and an arc-extinguishing chamber as described in any one of claims 1-6, wherein an exhaust channel is provided on the housing corresponding to the arc-extinguishing chamber, and an arc-extinguishing plate is disposed within the exhaust channel.

8. The switch body of the DC disconnect switch according to claim 7, characterized in that: The stationary contact has an arc-inducing portion extending into the arc-extinguishing space of the arc-extinguishing chamber at one end.

9. The switch body of the DC disconnect switch according to claim 8, characterized in that: The stationary contact has an arc-shaped groove on the side of the contact portion facing the moving contact assembly, and the arc-shaped groove extends from the contact portion of the stationary contact to the arc-drawing portion.

10. The switch body of the DC disconnect switch according to claim 7, 8, or 9, characterized in that: The moving contact assembly includes a main shaft rotatably disposed within the housing and two contact plates linked to the main shaft. A contact space is formed between the two contact plates that contacts the stationary contact. Arc-inducing plates are respectively disposed on the side of the two contact plates facing the two sets of arc-extinguishing grid plate assemblies.

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