Switching device

Abstract

The utility model relates to an improvement of an arc extinguishing structure of a switching device, the switching device comprises a movable contact part, a static contact part and an arc isolating cover, the arc isolating cover is connected to a turntable piece and is selectively located at an arc isolating position or an avoiding position under the driving of the turntable piece, the arc isolating cover is movably arranged on a base, the base comprises a mounting surface, and the mounting surface is provided with an arc extinguishing surface. The static contact part is arranged on the mounting surface of the base; the arc-isolating cover is of a cover-shaped structure covering the mounting surface, the arc-isolating cover is provided with an abdicating opening, the abdicating opening is abdicated at the static contact part in the action process of the arc-isolating cover, and the arc-isolating cover at the arc-isolating position is matched with the mounting surface to form a physical isolation barrier for arc extinguishing. The physical isolation barrier is a partial surrounding structure which surrounds the static contact part and is provided with a receding opening. Compared with a large-opening arc isolating cover in the prior art, the arc isolating cover provided by the utility model is only provided with the abdicating opening at the static contact part on the physical isolating barrier, thereby improving the arc extinguishing effect and improving the arc extinguishing performance of the switching device.

Description

Technical Field

[0001] This utility model relates to the field of switching electrical appliance technology, and specifically to an improvement in the arc extinguishing structure of a switching electrical appliance. Background Technology

[0002] Switchgear refers to the switching devices defined in GB / T 5226.1-2019 / IEC 60204-1:2016, namely, electrical appliances used to connect or disconnect one or more circuit currents. Specific component forms can include circuit breakers, relays, disconnecting switches, etc. Disconnecting switches and circuit breakers generally have arc-extinguishing structures to extinguish the arc generated during the disconnection process between the moving and stationary contacts. Traditional arc-extinguishing structures are arc-extinguishing chambers, combined with a large opening distance to achieve arc extinguishing. For small rotary disconnecting switches or miniature circuit breakers, due to product size limitations, it is difficult to implement solutions with large opening distances and large arc-extinguishing chambers. Currently, for such small rotary disconnecting switches or miniature circuit breakers, existing technology extinguishes the arc by setting a physical isolation barrier between the moving and stationary contacts. This includes an arc-extinguishing shield with a cover-like structure, which surrounds the stationary contact to separate the moving and stationary contacts, forming a physical isolation barrier. In subsequent research and testing, the applicant found that the existing technical solution, due to the large opening of the arc shield, does not provide sufficient isolation between the moving and stationary contacts. It is possible that the moving and stationary contacts could form an arc connection through the opening above the arc shield, and there is still room for improvement in the arc extinguishing effect. Summary of the Invention

[0003] The purpose of this invention is to provide a switching device that improves the arc extinguishing effect by modifying the structure of the arc-blocking cover, thereby further enhancing the arc extinguishing performance of the switching device.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: a switching device, including a moving contact, a stationary contact, and an arc-blocking cover, wherein the arc-blocking cover is connected to the turntable component and selectively positioned in an arc-blocking position or an avoidance position under the drive of the turntable component, the arc-blocking cover is movably mounted on a base, the base including a mounting surface, and the stationary contact is disposed on the mounting surface of the base;

[0005] The arc-blocking cover is a cover-shaped structure that covers the mounting surface. The arc-blocking cover has a clearance opening. During the operation of the arc-blocking cover, the clearance opening is made to give way to the stationary contact portion. The arc-blocking cover located at the arc-blocking position cooperates with the mounting surface to form a physical isolation barrier for extinguishing the arc. The physical isolation barrier is a partial surrounding structure with the clearance opening that surrounds the stationary contact portion.

[0006] In one embodiment, the direction of movement of the arc-blocking shield from the avoidance position to the arc-blocking position is defined as the arc-cutting direction, the side of the arc-blocking shield facing the arc-cutting direction is defined as the arc-cutting side, and the clearance opening is located on the arc-cutting side of the arc-blocking shield to make way for the stationary contact portion during the movement of the arc-blocking shield.

[0007] In one embodiment, the arc shield is made of a gas-generating material, and the inner side of the arc shield has an inner extension.

[0008] In one embodiment, the arc-blocking cover includes a first arc-blocking portion and a second arc-blocking portion, the first arc-blocking portion and the second arc-blocking portion are connected to form a cover-shaped structure, the first arc-blocking portion is closer to the mounting surface than the second arc-blocking portion, the inner extension portion is disposed at one end of the first arc-blocking portion near the mounting surface, and is located on both sides of the stationary contact portion, respectively, along with the second arc-blocking portion.

[0009] In one embodiment, there is a gap between the edge of the arc shield facing the mounting surface and the mounting surface, the mounting surface has an isolation protrusion, and the height of the isolation protrusion relative to the mounting surface is greater than the gap, and an isolation recess is provided on the side surface of the arc shield facing the mounting surface, the isolation protrusion and the isolation recess forming a concave-convex fit.

[0010] In one embodiment, the arc-blocking cover is provided with a rotating shaft portion, one end of which is rotatably connected to the base, so that the arc-blocking cover is rotatably connected to the base with the rotating shaft portion as the center, and the isolation recess extends in an arc shape with the rotating shaft portion as the center.

[0011] In one embodiment, the inner side of the arc-blocking cover is provided with an inner extension portion, the inner extension portion is disposed on the edge of the arc-blocking cover facing the mounting surface, and the isolation recess is disposed on the inner extension portion.

[0012] In one embodiment, the arc-blocking cover includes a first arc-blocking portion, which has a tangent arc segment along the tangent arc direction and a connecting segment angled to the tangent arc direction. The connecting segment and the clearance opening are respectively disposed at both ends of the tangent arc segment along the tangent arc direction. The mounting surface of the base is also provided with an arc-blocking extension portion extending toward the direction of the arc-blocking cover. The arc-blocking extension portion is disposed outside the tangent arc segment of the first arc-blocking portion and extends beyond the clearance opening in the tangent arc direction, thereby extending the length of the physical isolation barrier in the tangent arc direction. The arc-blocking extension portion matches the outer surface shape of the tangent arc segment to form a tangent arc fit.

[0013] In one embodiment, the arc-blocking cover has a rotating shaft, a first arc-blocking portion, and a second arc-blocking portion. One end of the rotating shaft is rotatably connected to the base, so that the arc-blocking cover is rotatably connected to the base with the rotating shaft as the center. The second arc-blocking portion is located at the end of the rotating shaft that is away from the mounting surface. The first arc-blocking portion is connected to the second arc-blocking portion and the rotating shaft and extends in the direction of the mounting surface, so that the arc-blocking cover forms a cover-shaped structure covering the mounting surface. The edge of the first arc-blocking portion facing the tangential arc direction is the tangential arc side. The clearance opening is formed between the tangential arc side of the first arc-blocking portion and the rotating shaft. During the movement of the arc-blocking cover in the tangential arc direction, the arc-blocking cover surrounds the stationary contact portion therewith by means of the clearance opening.

[0014] In one embodiment, the moving contact is connected to the turntable and, driven by the turntable, closes or disconnects from the stationary contact, thereby creating a synchronous motion connection between the moving contact and the arc shield.

[0015] In one embodiment, the arc-blocking position is the position where the arc-blocking cover is in the state where the moving contact and the stationary contact are disconnected, and the avoidance position is the position where the arc-blocking cover is in the state where the moving contact and the stationary contact are closed.

[0016] In one embodiment, the switching device is a disconnecting switch or a circuit breaker.

[0017] The beneficial effects of this utility model are:

[0018] 1. This utility model forms a physical isolation barrier through the cooperation of the arc-isolating cover and the base mounting surface, thereby achieving the purpose of arc extinguishing. The arc-isolating cover has a clearance opening, so it can make way for the stationary contact during the movement of the arc-isolating cover, thereby surrounding the stationary contact within the physical isolation barrier. When the arc-isolating cover moves to the arc-isolating position, since the arc-isolating cover is placed on the mounting surface, and the physical isolation barrier has a semi-enclosed structure with a clearance opening, the stationary contact is basically surrounded by the physical isolation barrier. Compared with the existing arc-isolating covers with large openings, this utility model effectively improves the arc-extinguishing effect of the physical isolation barrier and can further enhance the arc-extinguishing performance of the switching electrical appliances.

[0019] 2. Setting the clearance opening on the arc-breaking side of the arc-isolating cover allows for a smaller clearance opening, resulting in a larger coverage area of ​​the physical isolation barrier around the stationary contact, further improving the arc-extinguishing effect of the physical isolation barrier.

[0020] 3. The arc shield is made of gas-generating material. The inner side of the arc shield is also provided with an inner extension to increase the gas generation. During the interruption of the moving and stationary contacts, gas can be generated to increase the air pressure inside the arc shield, blowing the free arc out of the arc shield, which is beneficial for arc extinguishing. It can also cooperate with the arc extinguishing grid outside the arc shield to eliminate the free arc.

[0021] 4. The inner extension and the second arc-blocking part are respectively arranged on both sides of the stationary contact, and together with the first arc-blocking part, they form a structure that surrounds the stationary contact, thereby generating a large amount of gas around the stationary contact, further improving the gas pressure inside the arc-blocking cover and the arc-extinguishing effect.

[0022] 5. The combination of the isolation protrusion and the isolation recess can fill the gap between the arc shield and the mounting surface, preventing free arcs from passing through the gap, improving the arc shielding reliability of the physical isolation barrier, increasing the creepage distance between the moving contact and the stationary contact, and also forming a motion guide for the arc shield, improving the working reliability of the arc shield. Attached Figure Description

[0023] Figure 1 This is an exploded view of Embodiment 1 of this utility model.

[0024] Figure 2 This is an assembly drawing of Embodiment 1 of this utility model.

[0025] Figure 3 This is an assembly drawing of Embodiment 1 of the present invention, excluding the moving contact and the turntable.

[0026] Figure 4 This is an assembly diagram of the arc-blocking cover in the arc-blocking position of Embodiment 1 of this utility model.

[0027] Figure 5 This is an assembly diagram of the arc-blocking cover in the avoidance position of Embodiment 1 of this utility model.

[0028] Figure 6 This is the arc-blocking shield structure of Embodiment 1 of this utility model. Figure 1 .

[0029] Figure 7 This is the arc-blocking shield structure of Embodiment 1 of this utility model. Figure 2 .

[0030] Figure 8 This is a structural diagram of the arc-blocking cover of Embodiment 2 of this utility model.

[0031] Among them: 1 moving contact, 2 stationary contact, 3 arc-blocking cover, 31 first arc-blocking part, 311 tangent segment, 312 connecting segment, 313 tangent edge, 32 second arc-blocking part, 33 rotating shaft part, 34 second external meshing tooth, 35 inner extension part, 351 isolation recess, 30 clearance opening, 4 turntable part, 41 first external meshing tooth, 5 base, 51 mounting surface, 52 limiting mating part, 53 isolation protrusion, 54 arc-blocking extension part. Detailed Implementation

[0032] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0033] Example 1

[0034] See Figures 1 to 5 As shown, this utility model discloses a switch electrical appliance, including a moving contact 1, a stationary contact 2 and an arc-blocking cover 3. The arc-blocking cover 3 is connected to a turntable 4 and is selectively located in an arc-blocking position or an avoidance position under the drive of the turntable 4. The arc-blocking cover 3 is movably mounted on a base 5. The base 5 includes a mounting surface 51, and the stationary contact 2 is mounted on the mounting surface 51 of the base 5.

[0035] The arc-isolating position is the position of the arc-isolating cover 3 when it moves to the state where the moving contact 1 and the stationary contact 2 are separated. Figure 4 The diagram shows the arc-isolating cover 3 in the arc-isolating position. At this time, the arc-isolating cover 3 covers the stationary contact 2 and cooperates with the mounting surface 51 of the base 5 to form a physical isolation barrier. The avoidance position is the position where the arc-isolating cover 3 is in the closed state when the moving contact 1 and the stationary contact 2 are in motion. Figure 5 The image shows the arc shield 3 in the avoidance position. At this time, the arc shield 3 is located beside the stationary contact 2 to avoid the closed moving contact 1 and stationary contact 2.

[0036] The moving contact 1 is connected to the turntable 4 and closes or disconnects from the stationary contact 2 under the drive of the turntable 4. The arc-blocking cover 3 is connected to the turntable 4 through a toothed transmission structure, so that the moving contact 1 and the arc-blocking cover 3 form a synchronous movement connection. Thus, the movement of the arc-blocking cover 3 can be synchronized with the movement of the moving and stationary contacts. The arc-blocking cover 3 cuts into the space between the moving contact 1 and the stationary contact 2 at the optimal time to cut and block the arc, shortening the arc extinguishing time. In other embodiments, the arc-blocking cover 3 can also be driven by other driving components, thereby separating the moving contact 1 from the driving components of the arc-blocking cover 3.

[0037] The mounting surface 51 of the base 5 is not limited to a plane or a curved surface. It can be a single plane, multiple planes, or a plane with concave and convex structures. In this embodiment, the mounting surface is generally a rectangular plane structure with multiple concave and convex structures (such as the isolation protrusion 53, the arc extension 54, and the annular protrusion structure for mounting the turntable 4, etc.).

[0038] See Figure 1 , Figures 6 to 7 As shown, the arc-blocking cover 3 is a cover-shaped structure installed on the mounting surface 51. The direction of movement of the arc-blocking cover 3 from the avoidance position to the arc-blocking position is defined as the arc-cutting direction X. The side of the arc-blocking cover 3 facing the arc-cutting direction X is the arc-cutting side. The arc-blocking cover 3 has a clearance opening 30. The clearance opening 30 is located on the arc-cutting side of the arc-blocking cover 3 so as to make way for the stationary contact 3 during the operation of the arc-blocking cover 3. The arc-blocking cover 3 located in the arc-blocking position cooperates with the mounting surface 51 to form a physical isolation barrier for arc extinguishing. The physical isolation barrier is a partial surrounding structure with a clearance opening 30 surrounding the stationary contact 2.

[0039] The arc-isolating cover 3 and the mounting surface 51 of the base 5, located at the arc-isolating position, cooperate to form a physical isolation barrier for arc extinguishing, thereby achieving the purpose of arc extinguishing. The arc-isolating cover 3 has a clearance opening 30 on the arc-cutting side, so that the physical isolation barrier forms a semi-enclosed structure with the clearance opening. Since the clearance opening 30 is located on the arc-cutting side of the arc-isolating cover 3, it can make way for the stationary contact 2 during the movement of the arc-isolating cover 3. Thus, when the arc-isolating cover 3 moves towards the arc-cutting direction X, it surrounds the stationary contact 2 inside the arc-isolating cover 3, or the arc-isolating cover 3 moves against the arc-cutting direction X (from the arc-isolating...). When the arc-isolating cover 3 moves to the arc-isolating position, it moves away from the stationary contact 2. When the arc-isolating cover 3 moves to the arc-isolating position, since the arc-isolating cover 3 is placed on the mounting surface 51, the stationary contact 2 is surrounded by a physical isolation barrier. The physical isolation barrier forms a structure that almost completely surrounds the stationary contact, with only the clearance opening 30 not surrounded. Compared with the existing arc-isolating cover with a large opening, this utility model increases the range of the physical isolation barrier surrounding the stationary contact 2, effectively improves the arc-extinguishing effect of the physical isolation barrier, and can further improve the arc-extinguishing performance of the switching device.

[0040] In this embodiment, the arc-blocking cover 3 is rotatably mounted on the base 5. Specifically, the arc-blocking cover 3 is provided with a rotating shaft 33, a first arc-blocking part 31, and a second arc-blocking part 32. One end of the rotating shaft 33 is rotatably connected to the base 5, so that the arc-blocking cover 3 is rotatably connected to the base 5 with the rotating shaft 33 as the center. The second arc-blocking part 32 is provided at the end of the rotating shaft 33 away from the mounting surface 51. The first arc-blocking part 31 is connected to the second arc-blocking part 32 and the rotating shaft 33 and extends in the direction of the mounting surface 51. That is, the first arc-blocking part 31 is closer to the mounting surface 51 than the second arc-blocking part 32, so that the arc-blocking cover 3 forms a cover-shaped structure covering the mounting surface 51. In order to make the installation of the arc-blocking cover 3 on the base 5 more stable, the mounting surface 51 of the base 5 is provided with a limiting fitting part 52 that partially surrounds the rotating shaft part 33. The limiting fitting part 52 can also form a pre-positioning of the arc-blocking cover 3 so that the rotating shaft part 33 can cooperate with the upper cover on the base 5.

[0041] See Figures 4 to 5 As shown, the turntable 4 is provided with a first external meshing tooth 41, and the second arc-blocking part 32 is provided with a second external meshing tooth 34. The first external meshing tooth 41 and the second external meshing tooth 34 form an externally meshing toothed transmission connection. The arc-blocking cover 3 can selectively switch to the arc-blocking position or the avoidance position by means of the toothed transmission connection. The toothed transmission is more accurate, making the operation of the arc-blocking cover 3 more accurate and reliable. In other embodiments, other transmission methods can also be used, such as a torsion spring provided in the arc-blocking cover 3. The turntable 4 drives the torsion spring to rotate and the torsion spring's restoring force to drive the arc-blocking cover 3 to move.

[0042] Besides rotation, the arc-isolating cover 3 can also move in other ways, such as linear translation. In this case, a rack structure can be set in the arc-isolating cover 3, and the arc-isolating cover 3 can be linearly translated by the meshing teeth of the rack and the turntable 4.

[0043] See Figure 1 , Figures 6 to 7As shown, the first arc-separating part 31 includes a tangent arc segment 311 along the tangent arc direction X and a connecting segment 312 at an angle to the tangent arc direction X. The tangent arc segment 311 is an arc-shaped structure with the rotating shaft part 33 as the center. One end of the connecting segment 312 is connected to the rotating shaft part 33, and the other end is connected to the tangent arc segment 311. The connecting segment 312 extends approximately radially along the tangent arc segment 311. The edge of the first arc-separating part 31 facing the tangent arc direction is the tangent arc edge 313, that is, the side of the tangent arc segment 311 away from the connecting segment 312 is the tangent arc edge 313. The clearance opening 30 is formed between the tangent edge 313 of the first arc-blocking part 31 and the rotating shaft part 33. That is, the connecting section 312 and the clearance opening 30 are respectively set at both ends of the tangent section 311 along the tangent direction X. During the process of the arc-blocking cover 3 moving towards the tangent direction X, the tangent edge 313 can lengthen the arc to play the role of arc cutting and squeeze the arc towards the clearance opening 30 so as to discharge the free arc outside the arc-blocking cover 3. The connecting section 312 can play the role of arc blocking at the end of the tangent section 311 away from the tangent direction X.

[0044] Since the clearance opening 30 is located on the side of the arc-blocking cover 3 facing the arc-cutting direction X, both the first arc-blocking part 31 and the second arc-blocking part 32 serve to isolate the electric arc. The creepage path between the moving contact 1 and the stationary contact 2 is from the moving contact 1 around the first arc-blocking part 31 of the arc-blocking cover 3 to the clearance opening 30 and then to the stationary contact 2, increasing the creepage distance. In contrast, the arc-blocking cover with a large opening in the prior art allows the free arc to directly pass through the opening of the arc-blocking cover and conduct between the moving contact 1 and the stationary contact 2, resulting in a shorter creepage distance.

[0045] In this embodiment, the arc-blocking cover 3 is rotatable. The first arc-blocking portion 31 is provided with a tangent arc segment centered on the pivot portion 33, which helps to control the range of motion of the arc-blocking cover 3. The outer edge of its range of motion is an arc centered on the pivot portion 33, preventing the arc-blocking cover 3 from interfering with the movement of the moving contact 1, the stationary contact 2, or the turntable 4. In other embodiments, the first arc-blocking portion 31 can also be other shapes, such as a straight line or a curve not centered on the pivot portion 33.

[0046] The arc-extinguishing shield 3 is made of a gas-generating material. An inner extension 35 is provided on the inner side of the arc-extinguishing shield 3. The arc-extinguishing shield, made of a gas-generating material, generates gas under the action of an electric arc, thus extinguishing the arc. The inner extension 35 on the inner side of the arc-extinguishing shield 3 increases the gas production. During the interruption of moving and stationary contacts, gas is generated, increasing the air pressure inside the arc-extinguishing shield 3, blowing the ionized arc outside the arc-extinguishing shield 3, preventing the arc from accumulating in large quantities inside the arc-extinguishing shield 3 and reigniting, which is beneficial for arc extinguishing. If necessary, arc-extinguishing grids can also be installed on the outside of the arc-extinguishing shield 3 to eliminate the ionized arc blown out of the arc-extinguishing shield 3.

[0047] An inner extension 35 is disposed at one end of the first arc-blocking portion 31 near the mounting surface 51, and is located on both sides of the stationary contact portion 2, along with the second arc-blocking portion 32. The inner extension 35 and the second arc-blocking portion 32 are respectively disposed on both sides of the stationary contact portion 2, and cooperate with the first arc-blocking portion 31 to form a structure surrounding the stationary contact portion 2, thereby generating a large amount of gas around the stationary contact portion 2, further improving the gas pressure inside the arc-blocking cover 3 and the arc-extinguishing effect.

[0048] In other embodiments, the inner extension 35 may also be disposed at other locations inside the arc-blocking cover 3, such as on the second arc-blocking portion 32 or the rotating shaft portion 33, or at one end of the first arc-blocking portion 31 near the second arc-blocking portion 32.

[0049] There is a gap between the edge of the first arc-blocking portion 31 and the mounting surface 51. This gap prevents the arc-blocking cover 3 from interfering with the mounting surface 51 during movement, ensuring the smooth operation of the arc-blocking cover 3. However, this gap leaves space for ionized arcs, which reduces the creepage distance between the moving contact 1 and the stationary contact 2, hindering the reliable extinguishing of the physical isolation barrier. Therefore, the mounting surface 51 is provided with an isolation protrusion 53, and the height of the isolation protrusion 53 relative to the mounting surface 51 is greater than the gap between the first arc-blocking portion 31 and the mounting surface 51. An isolation recess 351 is provided on the side of the inner extension 35 facing the mounting surface, forming a convex-concave fit between the isolation protrusion 53 and the isolation recess 351. The convex-concave fit between the isolation protrusion 53 and the isolation recess 351 fills the gap between the first arc-blocking portion 31 and the mounting surface 51, reducing the possibility of ionized arcs moving within this gap and increasing the creepage distance.

[0050] In other embodiments, the isolation recess 351 may also be disposed on the surface of the first arc-blocking portion 31 facing the mounting surface 51. This requires a larger thickness for the first arc-blocking portion 31 to ensure sufficient thickness for the isolation recess 351. Compared to disposing the isolation recess 351 in the first arc-blocking portion 31, this embodiment disposes of the isolation recess 351 in the inner extension portion 35. This reduces the thickness requirement for the first arc-blocking portion 31, which helps to reduce the overall thickness and weight of the arc-blocking cover 3, making the movement of the arc-blocking cover 3 easier to drive and reducing the force required to drive the turntable 4.

[0051] In this embodiment, the isolation recess 351 extends in an arc shape with the pivot 33 as the center. The interlocking of the isolation protrusion 53 and the isolation recess 351 can also form a motion guide for the arc-blocking cover 3, which helps to further restrict the movement direction of the arc-blocking cover 3 and make the operation of the arc-blocking cover 3 more reliable. For compact switching electrical appliances, it is easier to arrange the moving contact, stationary contact, arc-extinguishing grid and other structures.

[0052] The mounting surface 51 of the base 5 is also provided with an arc-blocking extension portion 54 extending in the direction of the arc-blocking cover 3. The arc-blocking extension portion 54 extends beyond the clearance opening 30 in the arc-blocking direction X outside the arc-cutting segment 311 of the first arc-blocking portion 31, thereby extending the length of the physical isolation barrier in the arc-blocking direction X. The presence of the arc-blocking extension portion 54 can extend the length of the physical isolation barrier in the arc-blocking direction X, thereby further increasing the creepage distance between the moving contact 1 and the stationary contact 2 and improving the arc-extinguishing effect. In addition, during the arc-cutting process, due to the presence of the arc-blocking extension portion 54 and the matching shape of the arc-cutting segment 311 and the arc-blocking extension portion 54, the arc-cutting segment 311 can squeeze the arc into the gap between itself and the arc-blocking extension portion 54, further elongating and cutting the arc. That is, the arc-cutting segment 311 and the arc-blocking extension portion 54 form an arc-cutting cooperation, cutting the arc more thoroughly, which is beneficial for arc extinguishing.

[0053] The matching shape of the outer surface of the arc-blocking extension 54 and the tangent arc segment 311 also forms a guiding fit. That is, the arc-blocking extension 54 is an arc-shaped structure with the pivot 33 as the center, which provides guidance for the movement of the arc-blocking cover 3, making the movement direction of the arc-blocking cover 3 more accurate. In this embodiment, the arc-blocking extension 54 covers the movement trajectory of the tangent arc segment 311 of the first arc-blocking part 31, thereby providing guidance for the entire movement of the arc-blocking cover 3, but only the part near the clearance opening 30 has the effect of extending the physical isolation barrier and tangent arc fit. In addition, in order to ensure the smooth operation of the moving contact 1, the middle part of the arc-blocking extension 54 is lower in height to make way for the moving contact 1.

[0054] In addition, the arc-blocking extension 54 can also prevent free arcs from passing through the gap between the first arc-blocking part 31 and the mounting surface 51. That is, the arc-blocking extension 54 can achieve the same effect of increasing the creepage distance as the concave-convex fit of the isolation protrusion 53 and the isolation recess 351. However, this embodiment has double protection, which makes the arc-blocking effect of the switch electrical appliances more guaranteed.

[0055] In this embodiment, the switching device is specifically an isolating switch; in other embodiments, the switching device may also be a circuit breaker.

[0056] Example 2

[0057] See Figure 8 As shown, the difference between this embodiment and embodiment 1 is that this embodiment does not provide the anti-contact fit between the isolation protrusion 53 and the isolation recess 351 as described in embodiment 1, and only relies on the fit between the arc-blocking extension 54 and the first arc-blocking part 31 to ensure the creepage distance between the moving contact 1 and the stationary contact 2.

[0058] Accordingly, since there is no need to provide the isolation recess 351, the dimension of the extension portion 35 extending in the direction of the pivot portion 33 can be reduced.

[0059] The other undescribed parts of this embodiment are the same as those in Embodiment 1.

[0060] In addition to the cover-shaped structure in which the first arc-blocking part 31 and the second arc-blocking part 32 together form the arc-blocking cover 3 as described in the above embodiments, in other embodiments, the arc-blocking cover 3 may also be other cover-shaped structures, such as a hemispherical shape with an opening, an irregular arc shape, or a polygon.

[0061] In the above embodiment, the clearance opening 30 is provided on the tangential side of the arc-blocking cover 3. In other embodiments, the clearance opening 30 may extend from the tangential side to other directions or multiple clearance openings may be provided, one of which may be provided on the tangential side. The clearance opening may extend to other directions relative to the clearance opening, or clearance openings may also be provided in other directions. For example, a clearance opening may be provided on the connecting section 312 of the first arc-blocking portion 31, or the clearance opening may extend to the connecting section 312. This embodiment, by providing the clearance opening 30 only on the tangential side of the arc-blocking cover 3, allows for a smaller size of the clearance opening 30, resulting in a more complete enclosure of the stationary contact portion 2 by the physical isolation barrier, further improving the arc-extinguishing effect of the physical isolation barrier, and further enhancing the arc-extinguishing performance of the switching device.

[0062] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that the remaining undescribed parts are prior art, and that all changes in form and detail made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims fall within the protection scope of the present invention.

Claims

1. A switching device, comprising a moving contact, a stationary contact, and an arc-blocking cover, wherein the arc-blocking cover is connected to a turntable and selectively positioned in an arc-blocking position or an avoidance position under the drive of the turntable, the arc-blocking cover being movably mounted on a base, the base including a mounting surface, and the stationary contact being disposed on the mounting surface of the base; characterized in that: The arc-blocking cover is a cover-shaped structure that covers the mounting surface. The arc-blocking cover has a clearance opening. During the operation of the arc-blocking cover, the clearance opening is made to give way to the stationary contact portion. The arc-blocking cover located at the arc-blocking position cooperates with the mounting surface to form a physical isolation barrier for extinguishing the arc. The physical isolation barrier is a partial surrounding structure with the clearance opening that surrounds the stationary contact portion.

2. The switching device according to claim 1, characterized in that: The direction of movement of the arc-blocking cover from the avoidance position to the arc-blocking position is defined as the arc-cutting direction, the side of the arc-blocking cover facing the arc-cutting direction is defined as the arc-cutting side, and the clearance opening is located on the arc-cutting side of the arc-blocking cover to make way for the stationary contact portion during the movement of the arc-blocking cover.

3. A switching device according to claim 1, characterized in that: The arc-blocking cover is made of gas-generating material, and the inner side of the arc-blocking cover is provided with an inner extension portion; the arc-blocking cover includes a first arc-blocking portion and a second arc-blocking portion, the first arc-blocking portion and the second arc-blocking portion are connected to form a cover-shaped structure, the first arc-blocking portion is closer to the mounting surface than the second arc-blocking portion, the inner extension portion is provided at one end of the first arc-blocking portion near the mounting surface, and is located on both sides of the stationary contact portion, respectively, along with the second arc-blocking portion.

4. A switching device according to claim 1, characterized in that: There is a gap between the edge of the arc shield facing the mounting surface and the mounting surface. The mounting surface has an isolation protrusion, and the height of the isolation protrusion relative to the mounting surface is greater than the gap. An isolation recess is provided on the side surface of the arc shield facing the mounting surface. The isolation protrusion and the isolation recess form a concave-convex fit.

5. A switching device according to claim 4, characterized in that: The arc-isolating cover is provided with a rotating shaft, one end of which is rotatably connected to the base, so that the arc-isolating cover is rotatably connected to the base with the rotating shaft as the center, and the isolation recess extends in an arc shape with the rotating shaft as the center.

6. A switching device according to claim 4, characterized in that: The inner side of the arc-blocking cover is provided with an inner extension portion, which is located on the edge of the arc-blocking cover facing the mounting surface, and the isolation recess is located on the inner extension portion.

7. A switching device according to claim 2, characterized in that: The arc-blocking cover includes a first arc-blocking portion, which has a tangent arc segment along the tangent arc direction and a connecting segment at an angle to the tangent arc direction. The connecting segment and the clearance opening are respectively disposed at both ends of the tangent arc segment along the tangent arc direction. The mounting surface of the base is also provided with an arc-blocking extension portion extending toward the direction of the arc-blocking cover. The arc-blocking extension portion is disposed outside the tangent arc segment of the first arc-blocking portion and extends beyond the clearance opening in the tangent arc direction, thereby extending the length of the physical isolation barrier in the tangent arc direction. The arc-blocking extension portion matches the outer surface shape of the tangent arc segment to form a tangent arc fit.

8. A switching device according to claim 2, characterized in that: The arc-blocking cover has a rotating shaft, a first arc-blocking part, and a second arc-blocking part. One end of the rotating shaft is rotatably connected to the base, so that the arc-blocking cover is rotatably connected to the base with the rotating shaft as the center. The second arc-blocking part is located at the end of the rotating shaft that is away from the mounting surface. The first arc-blocking part is connected to the second arc-blocking part and the rotating shaft and extends in the direction of the mounting surface, so that the arc-blocking cover forms a cover-shaped structure covering the mounting surface. The edge of the first arc-blocking part facing the tangential arc direction is the tangential arc edge. The clearance is formed between the tangential arc edge of the first arc-blocking part and the rotating shaft. During the movement of the arc-blocking cover in the tangential arc direction, the arc-blocking cover surrounds the stationary contact part with the clearance.

9. A switching device according to claim 1, characterized in that: The moving contact is connected to the turntable and, driven by the turntable, closes or opens from the stationary contact, thus creating a synchronous movement connection between the moving contact and the arc-blocking cover; and / or, The arc-blocking position is the position where the arc-blocking cover is in the state where the moving contact and the stationary contact are disconnected, and the avoidance position is the position where the arc-blocking cover is in the state where the moving contact and the stationary contact are closed.

10. A switching device according to any one of claims 1-9, characterized in that: The switching device is a disconnecting switch or a circuit breaker.

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