Switching device with arc extinguishing system

Abstract

The invention relates to the technical field of disconnecting switches, in particular to a switching device with an arc extinguishing system, which comprises a base, a cover body matched with the base and an enclosed cavity arranged between the base and the cover body, the enclosed cavity comprises shells stacked from top to bottom, and a rotary contact mechanism, a static contact, a medium cover and a transmission mechanism are arranged in the shells; the rotary contact mechanism can rotate around the central axis and is used for being connected with the static contact to achieve closing or being disconnected to achieve opening. According to the switching device with the arc extinguishing system, the core problems that the voltage boosting of a small-size single-pole switch is limited, the arc extinguishing is difficult and the like are effectively solved. Through the synchronous action of the sickle-shaped dielectric cover and the rotary contact mechanism, the static contact is coated and the arc path is cut off during opening, and an arc-resistant gas-generating insulating material is matched, so that the arc voltage can be quickly increased, the disconnection voltage of products with the same volume is increased to more than DC800V from DC400V, and the industrial voltage specification requirements of 400V and more are met.

Description

Technical Field

[0001] This invention relates to the field of disconnector technology, and more specifically, to a switchgear with an arc-extinguishing system. Background Technology

[0002] As the industry's requirements for voltage specifications of small-volume single-pole switches continue to increase, the maximum current specification voltage for a single layer has generally increased from 250V to 400V and above. Existing products are gradually losing competitiveness due to limitations in voltage upgrades. Traditional disconnect switches are prone to arcing between contacts during opening, and this arcing is difficult to extinguish quickly, hindering voltage level upgrades for smaller products. Some products use metal pins for transmission positioning, which not only poses a risk of electrical conductivity but also reduces the load-bearing capacity of the stationary contacts, leading to high temperatures in the arc-extinguishing chamber. Furthermore, the existing transmission structure design is unreasonable; using a pull rod transmission requires significant modifications to the internal structure, easily causing problems such as leakage and substandard protection levels. Conventional arc-extinguishing materials and structures lack sufficient insulation and gas-generating performance, failing to quickly increase the arc voltage for efficient arc extinguishing. Therefore, there is an urgent need to develop a switchgear that, without altering the product's installation and core mechanism, can achieve voltage specification upgrades within a small size while ensuring safe and stable operation through optimization of the arc-extinguishing system and transmission structure. Summary of the Invention

[0003] The purpose of this invention is to provide a switching device with an arc extinguishing system to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides a switching device with an arc-extinguishing system, comprising a base, a cover cooperating with the base, and an enclosing cavity disposed between the base and the cover. The enclosing cavity includes outer shells stacked from top to bottom. A rotating contact mechanism, a stationary contact, a dielectric cover, and a transmission mechanism are disposed within the outer shell. The rotating contact mechanism is rotatable around a central axis and is used to engage with the stationary contact to achieve closing or disengagement to achieve opening. The dielectric cover is connected to the rotating contact mechanism via the transmission mechanism, so that the dielectric cover moves synchronously with the rotation of the rotating contact mechanism. In the closed state, the dielectric cover is in an open state, not interfering with the engagement of the rotating contact mechanism and the stationary contact. In the open state, the dielectric cover is in a closed protective state, covering the stationary contact and isolating the arc path between the rotating contact mechanism and the stationary contact, achieving insulation isolation between the two.

[0005] This enclosure provides a stable installation space for internal components. The dielectric cover moves synchronously with the rotating contact mechanism, so it does not interfere with the contact engagement when closing and covers the stationary contact and blocks the arc path when opening, thus achieving insulation isolation. This solves the problems of difficult arc extinguishing and limited voltage boosting in traditional switches, ensuring safe operation in high-voltage scenarios.

[0006] Preferably, the outer casing is provided with an arc-shaped groove that mates with the dielectric cover, and the dielectric cover is provided with a guide rib near the arc-shaped groove. The guide rib and the arc-shaped groove form a sliding fit to guide the movement of the dielectric cover and compress the arc when the circuit is opened. The dielectric cover is made of an arc-resistant and gas-generating insulating material to quickly increase the arc voltage to extinguish the arc.

[0007] This design features an arc-shaped groove that slides in conjunction with the guide ribs, providing precise guidance for the dielectric cover's movement and compressing the arc during circuit breaking. The dielectric cover, made of arc-resistant insulating material, can withstand high-temperature corrosion and rapidly increase the arc voltage, significantly improving arc extinguishing efficiency and meeting the industry's high-voltage requirements.

[0008] Preferably, the rotary contact mechanism is driven to rotate by a switch knob. The rotary contact mechanism includes a moving contact, and the end of the moving contact is equipped with a clamp for connecting to the stationary contact. The clamp only serves to fix the connection. The top of the rotary contact mechanism is provided with a protrusion and the bottom is provided with a groove. The rotary contact mechanisms that are adjacent to each other rotate synchronously through the mating of the protrusion and the groove.

[0009] This design makes the switch knob easy to drive, and the clamp only serves as a fixed connection, simplifying the structure and not interfering with the contact performance; the engagement of the protrusion and groove enables the synchronous opening and closing of the multi-layer rotating contact mechanism, improving operational consistency and the reliability of multi-pole switch operation.

[0010] Preferably, the dielectric cover is provided with a central protruding shaft, which is rotatably engaged with the outer shell to achieve rotational positioning of the dielectric cover, and the central protruding shaft is made of insulating material.

[0011] This feature features a central protruding shaft that rotates in conjunction with the housing to provide stable rotational positioning for the dielectric cover, ensuring precise operation. The use of insulating material to replace traditional metal pins eliminates the risk of electrical conductivity, prevents a decrease in the load-bearing capacity of the stationary contact and high temperatures in the arc-extinguishing chamber, and ensures the insulation performance and safety of the switch.

[0012] Preferably, the transmission mechanism is a gear transmission mechanism or a linkage transmission mechanism.

[0013] Preferably, when the transmission mechanism is a gear transmission mechanism, it includes a turntable gear fixedly connected to the rotating contact mechanism and a medium cover gear fixedly connected to the medium cover, wherein the turntable gear and the medium cover gear mesh with each other.

[0014] Preferably, the turntable gear has a module of 1 and 19 teeth, the medium cover gear has a module of 1 and 16 teeth, the center distance between the turntable gear and the medium cover gear is 17.5 mm, and the gear thickness is 1.95 mm.

[0015] This design features a meshing mechanism between the turntable gear and the dielectric cover gear, ensuring smooth and seamless transmission. It allows for precise synchronization between the dielectric cover and the rotating contact mechanism, offering excellent structural compatibility and not affecting the installation of other components. Precise gear parameter matching ensures smooth transmission and accurate, controllable dielectric cover movement, balancing transmission efficiency with a compact structure, and adapting to limited installation space within the switch.

[0016] Preferably, when the transmission mechanism is a linkage transmission mechanism, it includes linkages at both ends that are rotatably connected to the medium cover and the rotary contact mechanism, respectively.

[0017] This design features a connecting rod with the medium cover and a rotating contact mechanism at both ends, resulting in a simple and reliable structure that does not affect the connection and fit of components at each layer. It avoids potential problems caused by internal material reduction and ensures transmission stability and operational safety.

[0018] Preferably, the dielectric cover is sickle-shaped to completely cover the stationary contact to achieve arc isolation. The material of the dielectric cover is any one of melamine-formaldehyde resin, ceramic, thermoplastic insulating material, or thermosetting insulating material.

[0019] This feature, with its sickle-shaped dielectric cover, completely encloses the stationary contact, ensuring comprehensive and thorough arc isolation. Multiple arc-resistant material options are available to suit different scenarios, and rapid gas generation enhances arc voltage, significantly increasing the breaking voltage of products of the same volume and improving product voltage rating and market competitiveness.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: This switchgear with an arc-extinguishing system effectively solves core problems such as limited voltage boosting and difficulty in extinguishing arcs in small-volume single-pole switches. Through the synchronized operation of the sickle-shaped dielectric cover and the rotating contact mechanism, the stationary contact is covered and the arc path is blocked during opening. Combined with arc-resistant gas-generating insulation material, the arc voltage can be rapidly increased, raising the breaking voltage of products of the same volume from DC400V to over DC800V, meeting industry requirements for 400V and above. The cooperation between the guide ribs and the arc-shaped groove further compresses the arc and improves arc-extinguishing efficiency. The use of a gear or linkage transmission mechanism eliminates the need for extensive modifications to the internal structure, avoiding the leakage and substandard protection levels issues that can easily occur with pull-rod transmissions. Precise gear parameter matching ensures stable transmission, and the linkage design does not affect interlayer fit. The central protruding shaft made of insulating material replaces the metal pin, eliminating the risk of conductivity, ensuring the load-bearing capacity of the stationary contact, and preventing high temperatures in the arc-extinguishing chamber. The rotating contact mechanism features a bump-groove mating design that enables multi-layer synchronous action without altering the product's installation or core structure, thus balancing performance improvement with practicality and safety. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the rotating contact mechanism in this invention; Figure 4 This is a schematic diagram of the outer shell structure in this invention; Figure 5 This is a partial structural diagram of the gear transmission of the present invention; Figure 6 This is a partial structural diagram of the linkage transmission of the present invention; The meanings of the labels in the diagram are as follows: 1. Base; 2. Cover; 3. Rotary contact mechanism; 31. Moving contact; 32. Clamping plate; 4. Stationary contact; 5. Medium cover; 51. Guide rib; 52. Central protruding shaft; 6. Transmission mechanism; 61. Turntable gear; 62. Medium cover gear; 63. Connecting rod; 7. Housing; 71. Arc groove; 8. Switch knob. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0023] This invention provides a switching device with an arc-extinguishing system, such as... Figures 1-6 As shown, the device includes a base 1, a cover 2 that mates with the base 1, and an enclosing cavity disposed between the base 1 and the cover 2. The enclosing cavity includes a shell 7 stacked from top to bottom. Inside the shell 7, there is a rotating contact mechanism 3, a stationary contact 4, a dielectric cover 5, and a transmission mechanism 6. The rotating contact mechanism 3 can rotate around its central axis and is used to engage with the stationary contact 4 to achieve closing or disengagement to achieve opening. The dielectric cover 5 is connected to the rotating contact mechanism 3 via the transmission mechanism 6, so that the dielectric cover 5 moves synchronously with the rotation of the rotating contact mechanism 3. In the closed state, the dielectric cover 5 is in the open state and does not interfere with the engagement of the rotating contact mechanism 3 and the stationary contact 4. In the open state, the dielectric cover 5 is in the closed protective state, covering the stationary contact 4 and isolating the arc path between the rotating contact mechanism 3 and the stationary contact 4, thus achieving insulation isolation between the two.

[0024] The enclosed cavity formed by the base 1, cover 2, and outer shell 7 provides a stable installation space for internal components. The stacked outer shell 7 from top to bottom adapts to multi-layer structure requirements. The rotating contact mechanism 3 can rotate around the central axis, and drives the dielectric cover 5 to move synchronously through the transmission mechanism 6. When closing, the dielectric cover 5 opens without interfering with the engagement of the rotating contact mechanism 3 and the stationary contact 4. When opening, the dielectric cover 5 closes to cover the stationary contact 4, effectively blocking the arc path and achieving insulation isolation between the two. This solves the problems of arc being difficult to extinguish and voltage boosting being limited when traditional switches open, ensuring operational safety in high-voltage scenarios.

[0025] In this embodiment, the outer shell 7 is provided with an arc-shaped groove 71 that cooperates with the dielectric cover 5. The dielectric cover 5 is provided with a guide rib 51 near the arc-shaped groove 71. The guide rib 51 and the arc-shaped groove 71 form a sliding fit, which is used to guide the movement of the dielectric cover 5 and compress the arc when the circuit is opened. The dielectric cover 5 is made of an arc-resistant and gas-generating insulating material, which is used to quickly increase the arc voltage to extinguish the arc.

[0026] The arc-shaped groove 71 of the outer casing 7 and the guide rib 51 of the dielectric cover 5 form a sliding fit, which not only provides precise guidance for the movement of the dielectric cover 5 and avoids deviation and jamming, but also compresses the arc and accelerates its extinction during opening. The dielectric cover 5 is made of arc-resistant and gas-generating insulating material, which can not only withstand the high-temperature erosion of high-voltage arcs, but also quickly increase the arc voltage through gas generation, greatly improving the arc extinguishing efficiency and ensuring stable operation of the switch under high voltage specifications of 400V and above, adapting to the industry's voltage upgrade requirements.

[0027] Specifically, the rotary contact mechanism 3 is driven to rotate by the switch knob 8. The rotary contact mechanism 3 includes a moving contact 31. The end of the moving contact 31 is equipped with a clamping piece 32 for connecting the stationary contact 4. The clamping piece 32 only serves to fix the connection. The top of the rotary contact mechanism 3 is provided with a protrusion and the bottom is provided with a groove. The upper and lower adjacent rotary contact mechanisms 3 rotate synchronously through the docking of the protrusion and the groove.

[0028] The switch knob 8 can easily drive the rotary contact mechanism 3 to rotate, making operation intuitive and efficient. The clamp 32 at the end of the moving contact 31 only serves a fixed connection function, simplifying the structural design while avoiding interference with the contact performance. The protrusion on the top and the groove on the bottom of the rotary contact mechanism 3 enable precise docking of adjacent mechanisms, ensuring synchronous opening and closing of the multi-layer rotary contact mechanism 3, improving operational consistency and reliability, and adapting to the collaborative working requirements of multi-pole switches.

[0029] Furthermore, the dielectric cover 5 is provided with a central protruding shaft 52, which is rotatably engaged with the outer shell 7 to achieve the rotational positioning of the dielectric cover 5. The central protruding shaft 52 is made of insulating material.

[0030] The central protruding shaft 52 of the dielectric cover 5 rotates with the outer casing 7, providing stable rotational positioning for the dielectric cover 5 and ensuring its precise and controllable operation. The central protruding shaft 52 is made of insulating material, replacing the traditional metal pin, completely eliminating the risk of conductivity and avoiding the reduction in load-bearing capacity and high temperature problems in the arc-extinguishing chamber caused by the metal pin passing through the stationary contact 4. This further ensures the insulation performance and operational safety of the switch and meets the safety requirements of high-voltage scenarios.

[0031] Furthermore, when the transmission mechanism 6 is a gear transmission mechanism, it includes a turntable gear 61 fixedly connected to the rotating contact mechanism 3 and a medium cover gear 62 fixedly connected to the medium cover 5. The turntable gear 61 and the medium cover gear 62 mesh with each other. The turntable gear 61 has a module of 1 and 19 teeth, the medium cover gear 62 has a module of 1 and 16 teeth, the center distance between the turntable gear 61 and the medium cover gear 62 is 17.5 mm, and the gear thickness is 1.95 mm.

[0032] The rotary gear 61 (module 1, 19 teeth) of the gear transmission mechanism meshes precisely with the dielectric cover gear 62 (module 1, 16 teeth). The design parameters of a 17.5mm center distance and 1.95mm thickness ensure smooth, uninterrupted transmission without affecting the installation of the magnet. This transmission method requires no major modifications to the internal structure of the switch, avoiding problems such as leakage and inadequate protection levels that are easily caused by lever transmission. It achieves synchronized and precise movement of the dielectric cover 5 and the rotating contact mechanism 3, improving transmission reliability and structural stability.

[0033] Furthermore, the dielectric cover 5 is sickle-shaped to completely cover the stationary contact 4 to achieve arc isolation. The material of the dielectric cover 5 is any one of melamine-formaldehyde resin, ceramic, thermoplastic insulating material, or thermosetting insulating material. When the rotary contact mechanism 3 rotates to open, the transmission mechanism 6 drives the dielectric cover 5 to rotate towards the stationary contact 4 until it completely covers the stationary contact 4; when the rotary contact mechanism 3 rotates to close, the transmission mechanism 6 drives the dielectric cover 5 to rotate away from the stationary contact 4 until it is fully open. The stationary contact 4 is correspondingly arranged with the moving contact of the rotary contact mechanism 3, and the number of dielectric covers 5 is consistent with the number of groups of stationary contacts 4, and they cover each group of stationary contacts 4 one by one.

[0034] The sickle-shaped dielectric cover 5 completely encloses the stationary contact 4, providing comprehensive arc isolation coverage and thorough arc isolation effect. Multiple arc-resistant material options, such as melamine-formaldehyde resin, are available to suit the performance requirements of different scenarios. During opening and closing, the dielectric cover 5 rotates precisely in a designated direction, without interfering with the engagement or disengagement of the rotating contact mechanism 3 and the stationary contact 4. Through its one-to-one correspondence with the stationary contact 4, it completely isolates the arc path between each contact, increasing the breaking voltage of products of the same volume to over DC 800V, significantly improving the product's voltage rating and market competitiveness. Example

[0035] Furthermore, when the transmission mechanism 6 is a linkage transmission mechanism, it includes a linkage 63 at both ends that are rotatably connected to the medium cover 5 and the rotating contact mechanism 3, respectively.

[0036] The transmission mechanism 6 uses a connecting rod 63, whose two ends are rotatably connected to the dielectric cover 5 and the rotating contact mechanism 3, respectively. This design is simple in structure and reliable in transmission. It does not require extensive modifications to the internal structure of the switch, avoiding problems such as leakage and substandard protection levels caused by internal material reduction. Simultaneously, it does not affect the connection and coordination between layers, ensuring that the dielectric cover 5 moves synchronously and accurately with the rotating contact mechanism 3. This design balances transmission stability, structural compatibility, and operational safety, providing the switch with diverse transmission options.

[0037] When using the switch device with arc extinguishing system of the present invention, during gear transmission, the operator first turns the switch knob 8, driving the rotating contact mechanism 3 to rotate around the central axis. Since the rotating contact mechanism 3 is fixedly connected to the turntable gear 61, the turntable gear 61 (module 1, number of teeth 19) rotates together, and through meshing, drives the dielectric cover gear 62 (module 1, number of teeth 16) to rotate. The two are smoothly transmitted at a center distance of 17.5mm. Driven by the dielectric cover gear 62, the dielectric cover 5 rotates away from the stationary contact 4, using the central protruding shaft 52 of the insulating material as the rotation positioning point. Its guide rib 51 slides along the arc-shaped groove 71 of the outer shell 7, ensuring precise and non-offset operation. Until the moving contact 31 of the rotating contact mechanism 3 is fully engaged with the stationary contact 4, the dielectric cover 5 is in a fully open state, without interfering with the contact engagement, completing the closing. Simultaneously, adjacent rotating contact mechanisms 3 connect through the top protrusion and bottom groove to achieve synchronous closing, ensuring multi-pole coordinated operation.

[0038] Reverse rotation of switch knob 8 causes rotary contact mechanism 3 to drive turntable gear 61 to rotate in the opposite direction, and dielectric cover gear 62 subsequently drives dielectric cover 5 to rotate closer to stationary contact 4. At the moment of opening, moving contact 31 separates from stationary contact 4, generating an electric arc. At this time, the guide rib 51 of dielectric cover 5 cooperates with the arc-shaped groove 71 to compress the electric arc; the sickle-shaped dielectric cover 5 quickly and completely covers stationary contact 4, blocking the arc path and achieving insulation isolation between moving and stationary contacts. Simultaneously, the melamine-formaldehyde resin and other arc-resistant gas-generating materials used in dielectric cover 5 rapidly generate gas under the high temperature of the electric arc, significantly increasing the arc voltage and accelerating arc extinguishing. This allows the switch to achieve a breaking voltage of over DC 800V in a small size, ensuring safe opening in high-voltage scenarios.

[0039] During linkage transmission, rotating the switch knob 8 drives the rotating contact mechanism 3 to rotate, and the connecting rod 63, which is rotatably connected to the rotating contact mechanism 3, moves the dielectric cover 5, which is rotatably connected to the other end. The dielectric cover 5, with the central protruding shaft 52 as the positioning point, slides along the arc-shaped groove 71 of the outer shell 7, opening away from the stationary contact 4. This transmission method does not require modification of the core internal structure of the switch and does not affect the connection and cooperation of the components in each layer until the moving contact 31 and the stationary contact 4 are stably engaged, the dielectric cover 5 is fully opened, and the circuit breaker is closed; the upper and lower rotating contact mechanisms 3 achieve synchronous operation through the docking of the protrusion and the groove.

[0040] Reverse rotation of the switch knob 8 causes the contact mechanism 3 to drive the connecting rod 63, pulling the dielectric cover 5 towards the stationary contact 4. The electric arc generated by the separation of the moving and stationary contacts is quickly covered and isolated by the moving dielectric cover 5, and the guide rib 51 cooperates with the arc groove 71 to compress the arc. The arc-resistant gas-generating material of the dielectric cover 5 generates gas in real time, increasing the arc voltage to quickly extinguish the arc and avoid the risk of leakage. At the same time, the central protrusion shaft 52 of the insulating material ensures stable positioning and no potential for conductivity. Finally, the dielectric cover 5 completely closes and covers the stationary contact 4, achieving reliable insulation isolation between the moving and stationary contacts and completing the circuit breaker opening.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A switching device with an arc-extinguishing system, characterized in that: The device includes a base (1), a cover (2) that mates with the base (1), and an enclosing cavity disposed between the base (1) and the cover (2). The enclosing cavity includes a shell (7) stacked from top to bottom. The shell (7) contains a rotating contact mechanism (3), a stationary contact (4), a dielectric cover (5), and a transmission mechanism (6). The rotating contact mechanism (3) can rotate around a central axis and is used to engage with the stationary contact (4) to achieve closing or disengagement to achieve opening. The dielectric cover (5) The dielectric cover (5) is connected to the rotating contact mechanism (3) via the transmission mechanism (6), so that the dielectric cover (5) moves synchronously with the rotation of the rotating contact mechanism (3): in the closed state, the dielectric cover (5) is in the open state and does not interfere with the engagement of the rotating contact mechanism (3) and the stationary contact (4); in the open state, the dielectric cover (5) is in the closed protection state, covering the stationary contact (4) and isolating the arc path between the rotating contact mechanism (3) and the stationary contact (4), thereby achieving insulation isolation between the two.

2. The switching device with an arc-extinguishing system according to claim 1, characterized in that: The outer casing (7) is provided with an arc-shaped groove (71) that cooperates with the dielectric cover (5). The dielectric cover (5) is provided with a guide rib (51) near the arc-shaped groove (71). The guide rib (51) and the arc-shaped groove (71) form a sliding fit to guide the movement of the dielectric cover (5) and compress the electric arc when the circuit is opened. The dielectric cover (5) is made of an arc-resistant and gas-generating insulating material to quickly increase the arc voltage to extinguish the arc.

3. The switching device with an arc-extinguishing system according to claim 1, characterized in that: The rotating contact mechanism (3) is driven to rotate by a switch knob (8). The rotating contact mechanism (3) includes a moving contact (31). The end of the moving contact (31) is equipped with a clamp (32) for connecting the stationary contact (4). The clamp (32) only serves as a fixed connection. The top of the rotating contact mechanism (3) is provided with a protrusion and the bottom is provided with a groove. The upper and lower adjacent rotating contact mechanisms (3) rotate synchronously through the docking of the protrusion and the groove.

4. The switching device with an arc-extinguishing system according to claim 1, characterized in that: The dielectric cover (5) is provided with a central protruding shaft (52), which is rotatably engaged with the outer shell (7) to realize the rotational positioning of the dielectric cover (5). The central protruding shaft (52) is made of insulating material.

5. The switching device with an arc-extinguishing system according to claim 1, characterized in that: The transmission mechanism (6) is a gear transmission mechanism or a linkage transmission mechanism.

6. The switching device with an arc-extinguishing system according to claim 6, characterized in that: When the transmission mechanism (6) is a gear transmission mechanism, it includes a turntable gear (61) fixedly connected to the rotating contact mechanism (3) and a medium cover gear (62) fixedly connected to the medium cover (5), wherein the turntable gear (61) and the medium cover gear (62) mesh with each other.

7. The switching device with an arc-extinguishing system according to claim 7, characterized in that: The turntable gear (61) has a module of 1 and a number of teeth of 19. The medium cover gear (62) has a module of 1 and a number of teeth of 16. The center distance between the turntable gear (61) and the medium cover gear (62) is 17.5 mm, and the gear thickness is 1.95 mm.

8. The switching device with an arc-extinguishing system according to claim 6, characterized in that: When the transmission mechanism (6) is a linkage transmission mechanism, it includes a linkage (63) whose two ends are rotatably connected to the medium cover (5) and the rotating contact mechanism (3) respectively.

9. The switching device with an arc-extinguishing system according to claim 1, characterized in that: The dielectric cover (5) is sickle-shaped and is used to completely cover the stationary contact (4) to achieve arc isolation. The material of the dielectric cover (5) is any one of melamine formaldehyde resin, ceramic, thermoplastic insulating material or thermosetting insulating material.

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