Shielding device for vacuum switch and vacuum switch with shielding device

Abstract

The utility model relates to a shielding device for a vacuum switch and the vacuum switch with the shielding device. The shielding device comprises a pair of shielding plates, each shielding plate comprises a main body part which is of a straight plate structure extending in the vertical direction and is arranged opposite to the transmission device in the transverse direction; a pair of connecting parts which are respectively arranged at two longitudinal ends of the main body part adjacent to the vertical end side of the arc extinguishing device, and each connecting part is configured to extend away from the main body part in the vertical direction and extend towards the other shielding plate in the transverse direction; the first arc-shaped extension parts are arranged on the two longitudinal sides of the main body part and the vertical end side far away from the arc extinguishing device; the pair of second arc-shaped extension parts are respectively arranged on the transverse end sides, back on to the other shielding plate, of the connecting parts and the vertical end sides, far away from the main body part, of the connecting parts; the curvature radius of the first arc-shaped extending part ranges from 8 mm to 20 mm, and the pair of second arc-shaped extending parts continuously extend from the two longitudinal sides of the first arc-shaped extending part respectively and are in smooth transition connection with the first arc-shaped extending part.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical equipment technical field especially relates to shielding device for vacuum switch and vacuum switch with it. BACKGROUND

[0002] The vacuum switch is widely used in industrial and mining enterprises, power plants and substation and the like owing to its small size, light weight and safe and reliable advantages, which can include arc-extinguishing chamber and transmission mechanism connected with the moving end of the arc-extinguishing chamber to make the arc-extinguishing chamber open and close. However, since the moving end of the arc-extinguishing chamber is current-carrying part and the transmission mechanism usually includes a plurality of irregular-shaped components, this will cause uneven distribution of electric field at the transmission mechanism, and even the phenomenon of sharp-point discharge can occur, thereby causing the defect of reliability reduction of the vacuum switch.

[0003] Therefore, there is a demand in the art for shielding device capable of improving the electric field distribution at the transmission mechanism of the vacuum switch. SUMMARY

[0004] The utility model aims at providing a shielding device which can at least solve part of the above problems.

[0005] The utility model also aims at providing a vacuum switch applying the improved shielding device.

[0006] According to one aspect of the utility model, a shielding device for a vacuum switch is provided, the vacuum switch including an arc-extinguishing device and a transmission device installed at a vertical end side of the arc-extinguishing device to make the arc-extinguishing device capable of closing and opening, the shielding device being arranged at a vertical same side of the transmission device, and the shielding device including a pair of shielding plates located at two lateral sides of the transmission device; each shielding plate is configured to include: a main body part configured as a straight plate structure extending in a vertical direction and arranged opposite to the transmission device in a lateral direction; a pair of connecting parts arranged at two longitudinal ends of the main body part adjacent to the vertical end side of the arc-extinguishing device, each connecting part being configured to extend away from the main body part in a vertical direction and extend towards the other shielding plate in a lateral direction, so that the main body part is arranged spaced apart from the arc-extinguishing device in a vertical direction when the pair of connecting parts are connected to the arc-extinguishing device; a first arc-shaped extension part arranged at two longitudinal sides of the main body part and away from the vertical end side of the arc-extinguishing device to enclose the transmission device with the main body part in a plane perpendicular to the lateral direction, wherein the radius of curvature of the first arc-shaped extension part is between 8 mm and 20 mm; a pair of second arc-shaped extension parts arranged at the lateral end side away from the other shielding plate of each connecting part and away from the vertical end side of the main body part, the pair of second arc-shaped extension parts being configured to continuously extend from two longitudinal sides of the first arc-shaped extension part and be connected with the first arc-shaped extension part in a smooth transition.

[0007] Compared with the prior art, the main body part and the first arc-shaped extension part of the shielding plate of the shielding device are arranged on the same vertical plane, the connecting part for connecting the main body part to the arc extinguishing device extends from the main body part toward the other shielding plate, which can avoid occupying a large space while the main body part and the first arc-shaped extension part cooperatively shield the transmission device connected to the arc extinguishing device. In addition, the pair of shielding plates arranged on the lateral sides of the transmission device can be used for shielding between transmission devices of different phases, and the first arc-shaped extension part with a curvature radius of 8-20 mm and the second arc-shaped extension part smoothly transitioned from the first arc-shaped extension part on the shielding plate can improve the shielding effect. Finally, the main body part is arranged in a spaced state relative to the arc extinguishing device, which can be beneficial to improving the heat dissipation effect of the arc extinguishing device.

[0008] Preferably, the arc extinguishing device is configured as a cylindrical structure adjacent to the vertical end of the transmission device, and each connecting part of each shielding plate is configured to extend circumferentially around the outer periphery of the arc extinguishing device.

[0009] Preferably, a generally central region of the main body part of each shielding plate is provided with a mounting through hole for the lateral operation of the main shaft, and a third arc-shaped extension part is provided on the periphery of the mounting through hole.

[0010] Preferably, the main body part of each shielding plate is provided with a first connecting hole and a second connecting hole located on the longitudinal sides of the corresponding third arc-shaped extension part.

[0011] Preferably, the shielding device further comprises a first fastener adapted to the first connecting hole, a second fastener adapted to the second connecting hole, and a soft connection mounting member located between the pair of shielding plates, the first fastener connects the pair of shielding plates together through the first connecting hole, the second fastener fixes the soft connection mounting member between the pair of shielding plates through the second connecting hole, and the first fastener and the second fastener are both configured to not exceed the first arc-shaped extension part of the pair of shielding plates in the lateral direction.

[0012] Preferably, the main body part of each shielding plate is further provided with a third connecting hole located on the side of the corresponding third arc-shaped extension part away from the arc extinguishing device; the shielding device further comprises a third fastener adapted to the third connecting hole and a conductive strip mounting member located between the pair of shielding plates, the third fastener fixes the conductive strip mounting member between the pair of shielding plates through the third connecting hole, and the third fastener is configured to not exceed the first arc-shaped extension part of the pair of shielding plates in the lateral direction.

[0013] Preferably, the main body comprises, in vertical direction, a first vertical section adjacent to the arc extinguishing device and a second vertical section remote from the arc extinguishing device, the first vertical section being designed to extend straight in longitudinal direction adjacent to the vertical end face of the arc extinguishing device.

[0014] Preferably, the pair of shielding plates is arranged spaced apart in transverse direction with respect to each other.

[0015] According to another aspect of the present utility model, there is also provided a vacuum switch comprising an arc extinguishing device and a transmission device mounted at a vertical end side of the arc extinguishing device to enable the arc extinguishing device to be closed and opened, the vacuum switch further comprising the aforementioned shielding device.

[0016] Preferably, the transmission device comprises a transmission mechanism located substantially at a central portion of the shielding plates of the shielding device, a flexible connection extending from a side of the transmission mechanism adjacent to the arc extinguishing device to a side of the transmission mechanism remote from the arc extinguishing device, and a conductive busbar mounting connected to an end of the flexible connection remote from the arc extinguishing device.

[0017] Some of the other features and advantages of the present utility model will become apparent to those skilled in the art from a reading of the application, while others will be apparent on inspection of the accompanying drawings. Accordingly, no exhaustive list of features and advantages is given as this would be impractical in view of the number of combinations and permutations of features that can be made and tested. BRIEF DESCRIPTION OF DRAWINGS

[0018] In the following, embodiments of the present utility model will be described in detail with reference to the accompanying drawings, in which:

[0019] Figure 1 is a perspective view of a vacuum switch according to the present utility model comprising a shielding device;

[0020] Figure 2 is a front view of the vacuum switch shown in Figure 1

[0021] Figure 3 is a side view of the vacuum switch shown in Figure 1

[0022] Figure 4 is a perspective view of a vacuum switch according to the present utility model comprising a shielding device, wherein one of the shielding plates of the shielding device has been removed;

[0023] Figure 5 is a front view of the vacuum switch shown in Figure 4

[0024] Figure 6 is a side view of a shielding plate of a shielding device according to the present utility model.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] ​​​100 - vacuum switch; 20 - shielding device; 21 - shielding plate; 211 - main body portion; 211a - first vertical section; 211b - second vertical section; 212 - connecting portion; 212a - positioning portion; 213 - first arc-shaped extension; 214 - second arc-shaped extension; 215 - mounting through hole; 216 - third arc-shaped extension; 217 - first connecting hole; 218 - second connecting hole; 219 - third connecting hole; 22 - first fastener; 23 - second fastener; 24 - third fastener; 25 - flexible connection mounting member; 26 - conductive strip mounting member; 27 - fastening bolt; 30 - arc extinguishing device; 31 - support cross beam; 32 - arc extinguishing chamber; 321 - moving end; 322 - stationary end; 40 - transmission device; 41 - transmission mechanism; 42 - flexible connection member; 50 - transverse operation main shaft. DETAILED DESCRIPTION

[0027] With reference to the drawings, the schematic scheme of the vacuum switch and the shielding device thereof disclosed by the present application will be described in detail. Although the drawings are provided to present some embodiments of the present application, the drawings are not necessarily drawn according to the size of the specific embodiments, and some features can be enlarged, removed or partially cut to better show and explain the disclosure of the present application. Some components in the drawings can be adjusted in position according to actual needs without affecting the technical effects. The phrase "in the drawings" or similar language appearing in the specification does not necessarily refer to all drawings or examples.

[0028] Some directional terms used to describe the drawings in the following, such as "in", "out", "up", "down" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when normally looking at the drawings. Unless otherwise indicated, the directional terms described in the specification are basically in accordance with the conventional directions understood by those skilled in the art.

[0029] The terms "first", "the first", "second", "the second" and similar terms used in the present application do not represent any order, quantity or importance in the present application, but are used to distinguish one component from other components.

[0030] The terms "joint", "connection" and similar terms used in the present application include both indirect connection of two components by means of an intermediate layer such as adhesive, welding agent, etc. or intermediate piece such as connector, transition piece, etc. and direct connection of two components without any intermediate layer such as adhesive, welding agent, etc. or intermediate piece such as connector, transition piece, etc.

[0031] Figures 1 to 6The vacuum switch 100 and the shielding device 20 of the utility model are shown by way of example, the vacuum switch 100 in the example can include arc extinguishing device 30, transmission device 40 and transverse operation main shaft 50, arc extinguishing device 30 can include the support crossbeam 31 extending along the transverse direction and the arc extinguishing chamber 32 in the support crossbeam 31. One vertical end side of arc extinguishing chamber 32, namely the upper end, is configured as the moving end 321 and is connected with transmission device 40, the upper end of transmission device 40 is sleeved to transverse operation main shaft 50, thus, transverse operation main shaft 50 drives transmission device 40 to move in response to external closing operation or opening operation, and transmission device 40 in turn controls the moving end 321 of arc extinguishing chamber 32 to move to complete closing action and opening action.

[0032] It can be understood that the vacuum switch 100 in the utility model can be configured as a two-phase switch or a three-phase switch, but for the sake of clarity and simplicity, Figures 1 to 5 Only the arc extinguishing chamber 32 and transmission device 40 of a single phase are shown. In addition, "transverse" in the present text refers to the direction within and outside the page in the drawings, Figures 1 to 5 "vertical" refers to the up-down direction in the drawings, Figure 2 And "longitudinal" refers to the left-right direction in the drawings. Figure 2

[0033] The shielding device 20 in the utility model is arranged on the upper side of arc extinguishing device 30, so that the shielding device 20 and transmission device 40 are located on the same vertical side of arc extinguishing device 30, thereby realizing shielding between phases and relative shielding of transmission device 40. The shielding device 20 can include a pair of shielding plates 21, and the pair of shielding plates 21 are also sleeved to transverse operation main shaft 50 and are located on the transverse two sides of transmission device 40 respectively, compared with arranging various shielding structures at each sharp end of transmission device 40, this can simplify the installation steps while ensuring the shielding effect.

[0034] Specifically, the shielding plate 21 can be made of metal material and can include a main body part 211, a pair of connecting parts 212, a first arc-shaped extension part 213 and a second arc-shaped extension part 214.

[0035] As Figure 2 ​As shown, the main body 211 can be constructed as a straight plate structure extending vertically and generally perpendicular to the transverse operating spindle 50. The main body 211 and the transmission device 40 are arranged opposite each other in the transverse direction so that the main body 211 of the pair of shielding plates 21 can generally surround the transmission device 40. The main body 211 can be provided with connecting portions 212 at its longitudinal ends adjacent to the vertical end side of the arc-extinguishing chamber 32, i.e., the vertically downward end side. The connecting portions 212 extend horizontally toward the other shielding plate 21 while continuing to extend vertically downward from the vertically downward end side of the main body 211. When the connecting portions 212 are installed on the support beam 31, the main body 211 can be vertically spaced from the moving end 321 of the arc-extinguishing chamber 32, thereby improving the heat dissipation effect during use.

[0036] The first arc-shaped extension 213 can at least surround the outer periphery of the main body 211 except for the lower end side. That is, it extends upward from the lower end of one longitudinal end side of the main body 211 to the upper end side of the main body 211 away from the arc-extinguishing chamber 32, and then extends through the upper end side of the main body 211 to the lower end of the other longitudinal end side of the main body 211. Thus, it can cooperate with the main body 211 to surround the transmission device 40 on a plane perpendicular to the transverse direction, thereby improving the shielding effect of the shielding plate 21.

[0037] The second arc-shaped extension 214 can be arranged on the side of the connecting portion 212 facing away from the transmission device 40. That is, a pair of second arc-shaped extensions 214 extend continuously downward from both longitudinal sides of the first arc-shaped extension 213, respectively, and are arranged on the lateral end side of the pair of connecting portions 212 facing away from the other shielding plate 21 and on the vertical end side (lower end side) away from the main body portion 211, to improve the shielding effect of the shielding plate 21. The radius of curvature of the first arc-shaped extension 213 can be set between 8 mm and 20 mm, and the second arc-shaped extension 214 smoothly transitions to the first arc-shaped extension 213 and has the same radius of curvature as the first arc-shaped extension 213. In embodiments not shown, the second arc-shaped extension 214 may also have a different radius of curvature than the first arc-shaped extension 213.

[0038] Optionally, such as Figures 1 to 3 As shown, the upper end of the arc extinguishing device 30 is a cylindrical structure with the vertical axis as the axis. The connecting part 212 can be designed to extend circumferentially around the outer periphery of the upper end of the arc extinguishing device 30 in a plane perpendicular to the vertical direction, so that the four connecting parts 212 of a pair of shielding plates 21 extend along the same circumference in a plane perpendicular to the vertical direction.

[0039] Optionally, combined Figures 1 to 3 and Figure 4As shown, the transmission device 40 can include a transmission mechanism 41 and a flexible connection 42. The transmission mechanism 41 is provided with a non-circular hole extending through in the axial direction, for the transverse operation spindle 50 to pass through and drive the corresponding movement of the transmission mechanism 41. One end of the flexible connection 42 is connected to the moving end 321 of the arc extinguishing chamber 32, and then extends around the transmission mechanism 41 to the upper side of the transmission mechanism 41, so as to save the overall space and can be connected to the busbar, such as the main busbar, at the upper side of the transmission mechanism 41 by means of the conductive strip mounting member 26 described later. In an embodiment not shown, Figure 5 The vacuum switch 100 shown can be upside down, and the arc extinguishing chamber 32 is located at the upper side of the transmission mechanism 41, and the conductive strip mounting member 26 is located at the lower side of the transmission mechanism 41, in which case the conductive strip mounting member 26 can be used to connect to the branch busbar.

[0040] Alternatively, as shown, Figure 1 The substantially central region of the main body part 211 of the shielding plate 21 can be provided with a mounting through hole 215 extending through in the transverse direction and aligned with the non-circular hole of the transmission mechanism 41, so that the transverse operation spindle 50 passes through the mounting through hole 215 on one of the shielding plates 21, the non-circular hole on the transmission mechanism 41, and the mounting through hole 215 on the other shielding plate 21 in turn, thereby assembling the transverse operation spindle 50 and the shielding device 20 and the transmission device 40 together.

[0041] Alternatively, as shown, Figures 1 to 5 The main body part 211 of the shielding plate 21 is provided with a plurality of connecting holes on the longitudinal sides of the third arc-shaped extension 216, such as the three vertically aligned connecting holes shown in the figure. Among them, Figures 1 to 5 The lowermost connecting hole on the left side of the third arc-shaped extension 216 shown in the figure is the first connecting hole 217. Figure 2 The upper connecting hole on the right side of the third arc-shaped extension 216 shown in the figure is the second connecting hole 218, so as to facilitate the fixation between the shielding plate 21 and the flexible connection mounting member 25. In addition, the main body part 211 of the shielding plate 21 is also provided with a third connecting hole 219 on the upper side of the third arc-shaped extension 216.

[0042] The shielding device 20 can also include a first fastener 22, a second fastener 23, a third fastener 24, a flexible connection 42 mounting member, and a conductive strip mounting member 26. After a pair of shielding plates 21 are sleeved on the transverse operation spindle 50 and the connecting parts 212 of the pair of shielding plates 21 are positioned on the circumferential side of the support beam 31, a pair of first fasteners 22 are passed through the first connecting holes 217 of the pair of shielding plates 21 to fasten the pair of shielding plates 21 together.

[0043] The soft connection mounting member 25 is generally configured as a middle section extending in the transverse direction and two side sections extending in the longitudinal direction and located on the lateral sides of the middle section, wherein the middle section is fixed to the generally middle region of the soft connection member 42, and the two side sections are respectively abutted to the adjacent shielding plates 21, so as to be connected to the two side sections by the second fasteners 23 passing through the second connection holes 218, and then the soft connection member 42 is fastened to the shielding plates 21 by fastening the soft connection mounting member 25 to the shielding plates 21. The soft connection member 42 is used to connect the movable end 321 of the arc extinguishing chamber 32 with the main bus, and thus the extension length of the soft connection member 42 along the shielding plates 21 can increase the heat dissipation area of the movable end 321 of the arc extinguishing chamber 32, and thus the heat dissipation effect is improved.

[0044] The conductive strip mounting member 26 can extend in the transverse direction between a pair of shielding plates 21 until the lateral sides of the conductive strip mounting member 26 are close to the adjacent shielding plates 21. The third fasteners 24 can be connected to the conductive strip mounting member 26 by passing through the third connection holes 219 on the shielding plates 21, so as to fix the conductive strip mounting member 26 between the pair of shielding plates 21. The end of the soft connection member 42 away from the movable end 321 of the arc extinguishing chamber 32 is overlapped to the upper side of the conductive strip mounting member 26, and the main bus can be overlapped to the upper side of the soft connection member 42, so as to connect the soft connection member 42 and the main bus together by the fastening bolt 27 passing through the main bus and the soft connection member 42 and being connected to the conductive strip mounting member 26, and then the movable end 321 of the arc extinguishing chamber 32 is connected to the main bus through the soft connection member 42. It can be seen that the fastening bolt 27 is located on the lower side of the shielding plates 21 in the vertical direction. In this way, the connection of the movable end 321 of the arc extinguishing chamber 32 and the main bus through the soft connection member 42 can be shielded.

[0045] Referring to Figure 2 , the first arc-shaped extension 213 of the shielding plate 21 extends the farthest in the transverse direction compared to the third arc-shaped extension 216, the first fastener 22, the second fastener 23 and the third fastener 24, so that the third arc-shaped extension 216, the first fastener 22, the second fastener 23 and the third fastener 24 are all located between the farthest sides in the transverse direction of the first arc-shaped extension 213 of the pair of shielding plates 21, so as to improve the shielding effect of the shielding device 20.

[0046] Optionally, as shown in Figure 3 and Figure 1 , the body portion 211 can include a first vertical section 211a and a second vertical section 211b in the vertical direction, the first vertical section 211a is located on the lower side of the second vertical section 211b, and the pair of connecting portions 212 are respectively arranged on the longitudinal sides of the lower side of the first vertical section 211a.

[0047] Optionally, as shown in Figure 2As shown, a pair of shielding plates 21 are arranged in lateral direction with respect to each other, the transmission device 40 as a whole surrounds the transmission device 40 mechanically and electrically connected to the moving end 321 of the arc extinguishing chamber 32 in lateral, longitudinal and vertical directions, so as to improve the insulation performance between transmission devices 40 of different phases and relatively, and can greatly improve the heat dissipation effect.

[0048] Optionally, as Figure 3 Figure 6 As shown, a pair of connecting portions 212 of the shielding plate 21 are provided with positioning portions 212a, for example, positioning recesses as shown, on the side facing each other, which can be matched with the protrusions outside the support cross beam 31, so as to be quickly positioned when the shielding plate 21 is installed to the support cross beam 31, and also facilitate connecting the pair of shielding plates 21 together through the first fastener 22.

[0049] It should be understood that although the present specification is described according to each embodiment, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be combined to form other embodiments which can be understood by those skilled in the art.

[0050] The above description is only a specific embodiment of the present application, and is not intended to limit the scope of the present application. Any equivalent changes, modifications and combinations made by those skilled in the art without departing from the concept and principles of the present application shall fall within the scope of protection of the present application.

Claims

1. Shielding device (20) for a vacuum switch (100) comprising an arc extinguishing device (30) and a transmission device (40) mounted on a vertical end side of the arc extinguishing device (30) to enable closing and opening of the arc extinguishing device (30), characterized in that, The shielding device (20) is arranged on the same side of the arc extinguishing device (30) as the transmission device (40), and the shielding device (20) comprises a pair of shielding plates (21) arranged on both sides of the transmission device (40) in the transverse direction; Each shielding plate (21) is configured to comprise: a main body portion (211) configured as a straight plate structure extending in the vertical direction and arranged opposite to the transmission device (40) in the transverse direction; a pair of connecting portions (212) arranged at the longitudinal ends of the main body portion (211) adjacent to the vertical end sides of the arc extinguishing device (30), respectively, each connecting portion (212) being configured to extend away from the main body portion (211) in the vertical direction and extend towards the other shielding plate (21) in the transverse direction, so that the main body portion (211) is arranged spaced apart from the arc extinguishing device (30) in the vertical direction when the pair of connecting portions (212) are connected to the arc extinguishing device (30); a first arc-shaped extension portion (213) arranged at the longitudinal sides of the main body portion (211) and away from the vertical end sides of the arc extinguishing device (30), so as to enclose the transmission device (40) with the main body portion (211) in a plane perpendicular to the transverse direction, wherein the radius of curvature of the first arc-shaped extension portion (213) is between 8 mm and 20 mm; a pair of second arc-shaped extension portions (214) arranged at the transverse end sides of each connecting portion (212) away from the other shielding plate (21) and away from the vertical end sides of the main body portion (211), respectively, the pair of second arc-shaped extension portions (214) being configured to continuously extend from the longitudinal sides of the first arc-shaped extension portion (213) and smoothly transitionally connected with the first arc-shaped extension portion (213), respectively.

2. Shielding device (20) for a vacuum switch (100) according to claim 1, characterized in that The arc extinguishing device (30) is configured as a cylindrical structure adjacent to the vertical end portions of the transmission device (40), and each connecting portion (212) of each shielding plate (21) is configured to extend in the circumferential direction around the outer periphery of the arc extinguishing device (30).

3. Shielding device (20) for a vacuum switch (100) according to claim 1 or 2, characterized in that A substantially central region of the main body portion (211) of each shielding plate (21) is provided with a mounting through hole (215) for the transverse operation spindle (50) to pass through, and the periphery of the mounting through hole (215) is provided with a third arc-shaped extension portion (216).

4. Shielding device (20) for a vacuum switch (100) according to claim 3, characterized in that The main body portion (211) of each shielding plate (21) is provided with a first connecting hole (217) and a second connecting hole (218) arranged on both sides of the corresponding third arc-shaped extension portion (216) in the longitudinal direction. The main body portion (211) of each shielding plate (21) is provided with a first connecting hole (217) and a second connecting hole (218) arranged on both sides of the corresponding third arc-shaped extension portion (216) in the longitudinal direction.

5. Shielding device (20) for a vacuum switch (100) according to claim 4, characterized in that The shielding device (20) further comprises a first fastener (22) adapted to the first connecting hole (217), a second fastener (23) adapted to the second connecting hole (218), and a flexible connecting mount (25) located between the pair of shielding plates (21), the first fastener (22) connecting the pair of shielding plates (21) together through the first connecting hole (217), the second fastener (23) fixing the flexible connecting mount (25) between the pair of shielding plates (21) through the second connecting hole (218), the first fastener (22) and the second fastener (23) are both configured not to exceed the first arc-shaped extension (213) of the pair of shielding plates (21) in the transverse direction.

6. Shielding device (20) for a vacuum switch (100) according to claim 3, characterized in that The main body part (211) of each shielding plate (21) is further provided with a third connecting hole (219) located on the side of the corresponding third arc-shaped extension (216) away from the arc extinguishing device (30); the shielding device (20) further comprises a third fastener (24) adapted to the third connecting hole (219) and a conductive strip mount (26) located between the pair of shielding plates (21), the third fastener (24) fixing the conductive strip mount (26) between the pair of shielding plates (21) through the third connecting hole (219), the third fastener (24) is configured not to exceed the first arc-shaped extension (213) of the pair of shielding plates (21) in the transverse direction.

7. The shielding device (20) for a vacuum switch (100) according to claim 1, characterized in that The main body part (211) comprises a first vertical section (211a) adjacent to the arc extinguishing device (30) and a second vertical section (211b) away from the arc extinguishing device (30) in the vertical direction, the first vertical section (211a) adjacent to the vertical end face of the arc extinguishing device (30) is designed to extend straight in the longitudinal direction.

8. The shielding device (20) for a vacuum switch (100) according to claim 1, characterized in that The pair of shielding plates (21) are arranged spaced apart with respect to each other in the transverse direction.

9. A vacuum switch (100) comprising an arc extinguishing device (30) and a transmission device (40) mounted on a vertical end side of the arc extinguishing device (30) to enable closing and opening of the arc extinguishing device (30), characterized in that, The vacuum switch (100) further comprises the shielding device (20) according to any one of claims 1 to 8.

10. The vacuum switch (100) according to claim 9, characterized in that The transmission device (40) comprises a transmission mechanism (41) located substantially at the central part of each shielding plate (21) of the shielding device (20), a flexible connecting piece (42) extending around the transmission mechanism (41) from the side of the transmission mechanism (41) adjacent to the arc extinguishing device (30) to the side of the transmission mechanism (41) away from the arc extinguishing device (30), and a conductive strip mount (26) connected to the end of the flexible connecting piece (42) away from the arc extinguishing device (30).

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