A switch driving mechanism support device and a GIS comprising the same

Abstract

The application relates to a switch driving mechanism support device and a GIS containing the device. The switch driving mechanism support device comprises a seat body structure, the seat body structure comprises a disc-shaped support seat and an axial sealing section, the axial sealing section is used for sealingly penetrating into a transmission structure avoiding hole on a sealed shell of the GIS and has a sealing cooperation structure on an outer circumferential surface of the axial sealing section, the disc-shaped support seat has a mechanism connection hole used for fixedly connecting with a driving mechanism and used for fixedly supporting the driving mechanism, an installation hole penetrating through the seat body structure in an axial direction is arranged in a middle position of the seat body structure corresponding to the axial sealing section, a transmission shaft is sealingly and rotatably installed in the installation hole around an axis, and the disc-shaped support seat is further provided with a shell connection hole used for fixedly connecting with the sealed shell of the GIS. The application newly provides a switch driving mechanism support device, the distance between the driving mechanism and the sealed shell is shortened as much as possible, and the space occupied by the installation of the driving mechanism is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas insulated metal enclosed switchgear, and particularly relates to a switch driving mechanism supporting device and a GIS containing the device. BACKGROUND

[0002] In recent years, GIS has been more and more widely used as a kind of switchgear which can be applied to higher voltage levels, miniaturization, intelligence, better reliability and safety. The GIS device includes a sealed shell, and a switch contact structure of a circuit is installed in the sealed shell, wherein the moving contact of the switch contact structure realizes the opening and closing action by a driving mechanism, and the driving mechanism as a secondary device cannot bear a higher voltage level, so it is installed outside the sealed shell. A transmission structure avoiding hole is formed on the sealed shell at a position corresponding to the driving mechanism, and a transmission shaft of the output end of the driving mechanism penetrates through the transmission structure avoiding hole and extends into the sealed shell to be in transmission connection with the moving contact, and drives the moving contact to realize the opening and closing action.

[0003] The operating mechanism direct connection structure of the switchgear disclosed in the Chinese patent with the authorized announcement No. CN105448579B is mainly used for being installed outside the transmission structure avoiding hole of the sealed shell of the GIS device, and on one hand, it plays a role of fixing and supporting the driving mechanism, and on the other hand, it realizes the sealing of the sealed shell at the position of the transmission shaft. On the structure, two flange structures at both ends of the transmission device body are respectively fixedly connected with the sealed shell and the driving mechanism, and the transmission shaft is sealingly and rotatably installed in the inner cavity of the transmission device body. Although the operating mechanism direct connection structure indeed plays a role of sealing the position where the transmission shaft penetrates and fixing and supporting the driving mechanism, as a whole, it is installed outside the transmission structure avoiding hole of the sealed shell and protrudes from the sealed shell, so that the operating mechanism installed thereon is also higher than the sealed shell by a certain height, which cannot meet the new higher miniaturization design requirement. SUMMARY

[0004] The present application aims to provide a switch driving mechanism supporting device to solve the problem that the existing operating mechanism direct connection structure installed on the GIS occupies a large space and causes the GIS to have a large volume. Meanwhile, the present application also provides a GIS to solve the problem that the existing GIS occupies a large space.

[0005] The switch driving mechanism supporting device of the application comprises a seat structure, the seat structure comprises a disc-shaped supporting seat and an axial sealing segment arranged at the lower side of the disc-shaped supporting seat, the axial sealing segment is used for sealingly penetrating into a transmission structure avoiding hole on a GIS sealing shell and has a sealing matching structure on the outer circumferential surface thereof for sealingly matching with the inner wall of the transmission structure avoiding hole, the disc-shaped supporting seat has a mechanism connecting hole for fixedly connecting with the driving mechanism and is used for fixedly supporting the driving mechanism, an installation hole penetrating through the seat structure in the axial direction is arranged at the middle position of the axial sealing segment in the seat structure, a transmission shaft is sealingly installed in the installation hole and rotates around the axis, and the disc-shaped supporting seat is further provided with a shell connecting hole for fixedly connecting with the GIS sealing shell.

[0006] The switch driving mechanism supporting device of the application comprises a seat structure, the seat structure comprises a disc-shaped supporting seat and an axial sealing segment arranged at the lower side of the disc-shaped supporting seat, the axial sealing segment is used for sealingly penetrating into a transmission structure avoiding hole on a GIS sealing shell and has a sealing matching structure on the outer circumferential surface thereof for sealingly matching with the inner wall of the transmission structure avoiding hole, the disc-shaped supporting seat has a mechanism connecting hole for fixedly connecting with the driving mechanism and is used for fixedly supporting the driving mechanism, an installation hole penetrating through the seat structure in the axial direction is arranged at the middle position of the axial sealing segment in the seat structure, a transmission shaft is sealingly installed in the installation hole and rotates around the axis, and the disc-shaped supporting seat is further provided with a shell connecting hole for fixedly connecting with the GIS sealing shell.

[0007] Further, the shell connecting hole is a downwardly extending counterbore, and the upper disc surface of the disc-shaped supporting seat constitutes a supporting surface for supporting the driving mechanism. In this way, the driving mechanism is supported by the upper surface of the disc-shaped supporting seat, and the support is more stable. Moreover, the distance between the driving mechanism and the sealing shell is only the thickness of the disc-shaped supporting seat, which further helps to reduce the space occupied by the installation of the driving mechanism.

[0008] Further, the mechanism connecting hole at the radially outer side of the shell connecting hole is arranged in the circumferential direction offset from the shell connecting hole. In this way, the radial dimension of the disc-shaped supporting seat can be reduced as much as possible, which helps to realize the miniaturization of the device.

[0009] Further, the installation hole is a stepped hole comprising two or more hole segments with increasing inner diameters from top to bottom, and some of the two or more hole segments are rotating matching hole segments for installing bearings, and some are sealing matching hole segments for sealingly matching with the outer circumferential surface of the transmission shaft. The installation hole is in stopper matching with the transmission shaft or the bearing sleeved on the transmission shaft through the step surface, so as to limit the transmission shaft. This structure can stop and limit the transmission shaft or the bearing sleeved on the transmission shaft by means of the step surface, so as to overcome the high gas pressure in the sealing shell, and the structure has good stability.

[0010] Further, the mounting hole and the transmission shaft are provided with a lubricating grease groove at least one of the sealing fit positions of the two. The arrangement can not only lubricate and reduce the abrasion of the rotation of the transmission shaft through the oil in the lubricating grease groove, but also form an oil film seal to achieve better sealing effect.

[0011] Further, the sealing fit position of the mounting hole and the transmission shaft is provided with two or more axially spaced sealing rings, and the lubricating grease groove is arranged at the position between the two adjacent sealing rings. The arrangement of two or more sealing rings can achieve better sealing effect, and the arrangement of the lubricating grease groove between the two adjacent sealing rings can block and protect the oil therein from impurities to avoid the deterioration of the lubricating grease.

[0012] Further, the upper side of the disc-shaped support seat is provided with a waterproof sealing ring matched with the lower side of the driving mechanism radially outside the mechanism connecting hole. Thus, after the driving mechanism is installed on the disc-shaped support seat, the reliable sealing of the connecting position can be ensured.

[0013] Further, the lower side of the disc-shaped support seat is provided with a rainproof convex ring radially outside the support connecting part. The arrangement of the rainproof convex ring can avoid the spread of rainwater along the lower side of the disc-shaped support seat to the transmission structure avoiding hole, and improve the waterproof effect.

[0014] The GIS of the application comprises a sealed shell, the sealed shell is provided with a transmission structure avoiding hole, the switch driving mechanism support device is installed at the transmission structure avoiding hole, the switch driving mechanism support device comprises a seat structure, the seat structure comprises a disc-shaped support seat and an axial sealing segment arranged on the lower side of the disc-shaped support seat, the axial sealing segment is used for sealingly penetrating into the transmission structure avoiding hole of the GIS sealed shell and has a sealing fit structure matched with the inner wall of the transmission structure avoiding hole, the driving mechanism is fixed on the disc-shaped support seat, the seat structure is provided with a mounting hole penetrating through the seat structure along the axial direction at the middle position corresponding to the axial sealing segment, a transmission shaft is sealingly installed in the mounting hole and rotates around the axis, and the disc-shaped support seat is further provided with a shell connecting hole used for fixedly connecting with the GIS sealed shell.

[0015] The GIS of the application improves the switch driving mechanism support device connected to the outside thereof, the axial sealing segment with the sealingly rotating mounted transmission shaft is inserted into the transmission structure avoiding hole, the disc-shaped support seat is fixedly supported on the driving mechanism outside the sealed shell, so that the distance between the driving mechanism and the GIS sealed shell is shortened as much as possible, the space occupied by the installation of the driving mechanism is reduced, and the occupied space of the GIS is reduced as a whole.

[0016] Further, the shell connecting hole is a downwardly extending counterbore, and the upper disc surface of the disc-shaped support seat constitutes a support surface for supporting the driving mechanism. In this way, the driving mechanism is supported by the upper surface of the disc-shaped support seat, and the support is more stable. Moreover, the distance between the driving mechanism and the sealing shell is only the thickness of the disc-shaped support seat, which is conducive to reducing the space occupied by the driving mechanism.

[0017] Further, the mechanism connecting hole radially outside the shell connecting hole is circumferentially staggered with the shell connecting hole. In this way, the radial dimension of the disc-shaped support seat can be reduced as much as possible, which is conducive to the miniaturization of the device.

[0018] Further, the mounting hole is a stepped hole including two or more hole sections with increasing inner diameters from top to bottom, and some of the two or more hole sections are rotationally fitted hole sections for mounting bearings, and some are sealingly fitted hole sections for sealingly fitting the outer circumferential surface of the transmission shaft. The mounting hole is in stopper fitting with the transmission shaft or the bearing sleeved on the transmission shaft through the stepped surface, so as to limit the transmission shaft. This structure can stop and limit the transmission shaft or the bearing sleeved on the transmission shaft by means of the stepped surface, so as to overcome the high pressure in the sealing shell, and has good structural stability.

[0019] Further, at least one of the mounting hole and the transmission shaft is provided with a lubricating grease groove at the sealingly fitted position of the two. In this way, the oil in the lubricating grease groove can not only lubricate and reduce the wear of the rotation of the transmission shaft, but also form an oil film seal to achieve better sealing effect.

[0020] Further, the sealingly fitted position of the mounting hole and the transmission shaft is provided with two or more axially spaced sealing rings, and the lubricating grease groove is arranged at the position between the two adjacent sealing rings. The arrangement of the two or more sealing rings can achieve better sealing effect, and the arrangement of the lubricating grease groove between the two adjacent sealing rings can block and protect the oil therein, so as to avoid impurities from entering and causing the lubricating grease to deteriorate.

[0021] Further, the upper surface of the disc-shaped support seat is provided with a waterproof sealing ring matched with the lower surface of the driving mechanism radially outside the mechanism connecting hole. In this way, after the driving mechanism is installed on the disc-shaped support seat, the reliable sealing of the connecting position can be ensured.

[0022] Further, the lower surface of the disc-shaped support seat is provided with a rainproof convex ring radially outside the support connecting portion. The arrangement of the rainproof convex ring can prevent rainwater from spreading along the lower surface of the disc-shaped support seat to the transmission structure avoiding hole, and improve the waterproof effect. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure schematic diagram of the embodiment 1 of the GIS of the present application;

[0024] Figure 2 for display Figure 1 enlarged view of the structure at the connection position of the drive mechanism and the sealed housing;

[0025] Figure 3 schematic view of the structure of the switch drive mechanism support device.

[0026] In the figure: 1, sealed housing; 2, movable contact assembly; 3, drive mechanism support device; 30, disc-shaped support seat; 31, axial sealing section; 32, transmission shaft; 301, housing connection hole; 302, mechanism sealing ring; 303, rainproof convex ring; 311, bearing; 312, outer shaft sealing ring; 313, grease groove; 321, sealing matching shaft section; 4, drive mechanism. DETAILED DESCRIPTION

[0027] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and are not used to limit the present application, i.e., the described examples are only a part of the examples of the present application, but not all the examples. The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without making creative efforts are within the scope of protection of the present application.

[0029] It should be noted that the relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such a process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus including the element.

[0030] The features and performances of the present application will be further described in detail below in combination with the examples.

[0031] Specific example 1 of the GIS of the present application:

[0032] In this embodiment, the GIS has improved the structure of the drive mechanism support device 3 connected to its outer side for supporting the fixed drive mechanism 4, which shortens the distance between the drive mechanism 4 and the sealed shell 1, greatly reducing the space occupied by the GIS. This reduces the space requirements during transportation, storage and use, and better meets the requirements of GIS miniaturization.

[0033] Specifically, such as Figures 1-3 As shown, the GIS of this embodiment includes a sealed housing 1, within which a switch break structure is installed. A transmission structure clearance hole is provided at the upper part of the sealed housing 1 to allow the transmission of opening and closing power between the outer drive mechanism 4 and the moving contact assembly 2 of the switch break structure. A drive mechanism support device 3 is installed at the transmission structure clearance hole. The drive mechanism support device 3 supports and fixes the drive mechanism 4, provides a transmission shaft 32 for transmitting the opening and closing power from the outside to the inside, and also ensures the seal at the transmission structure clearance hole, preventing leakage of insulating gas inside the sealed housing 1.

[0034] The drive mechanism support device 3 specifically includes a seat structure, which includes a disc-shaped support base 30 and an axial sealing section 31 disposed on the lower side of the disc-shaped support base 30. The axial sealing section 31 is integrally formed with the disc-shaped support base 30. A mounting hole penetrating the seat structure in the vertical direction is provided in the middle of the axial sealing section 31. A drive shaft 32 is rotatably mounted in the mounting hole. The drive shaft 32 can rotate around the axis of the mounting hole, and there is a seal between the drive shaft 32 and the inner wall of the mounting hole, ensuring a seal at the mounting hole. The axial sealing section 31 is sealed and installed in the transmission structure clearance hole, and its outer surface seals against the transmission structure clearance hole, thereby ensuring a seal at the transmission structure clearance hole.

[0035] The disc-shaped support seat 30 of the seat body structure is located above the outer side of the transmission structure avoiding hole as a whole, and the driving mechanism 4 is fixedly supported on the disc-shaped support seat 30. Generally, the hole along the upper side of the transmission structure avoiding hole of the sealed shell 1 is provided with a flange connecting hole, and therefore the disc-shaped support seat 30 is provided with a shell connecting hole 301 at a position corresponding to the flange connecting hole. The shell connecting hole 301 is used for connecting a bolt to pass through from the upper side to the lower side and be screwed in the flange connecting hole, thereby realizing the fixed connection of the seat body structure and the sealed shell 1. In order to avoid the bolt passing through and being screwed in the shell connecting hole 301 affecting the fixed installation of the driving structure on the disc-shaped support seat 30, in the embodiment, the shell connecting hole 301 is a counterbore structure extending from the upper side to the lower side. In this way, the head of the bolt can be sunk below the upper disc surface of the disc-shaped support seat 30, and therefore the upper disc surface of the disc-shaped support seat 30 as a whole constitutes a support surface for supporting the driving mechanism 4. In this way, the driving mechanism 4 and the hole along the upper side of the transmission structure avoiding hole are only separated by the thickness of the disc-shaped support seat 30, thereby reducing the space occupied by the driving mechanism 4 in the height direction after being installed on the GIS sealed shell 1, and making the entire GIS occupy less space and the structure more compact.

[0036] Specifically, the disc-shaped support seat 30 is provided with a mechanism connecting hole on the radial outer side of the shell connecting hole 301. The mechanism connecting hole is used for connecting a bolt to pass through from the lower side to the upper side and connect the driving mechanism 4 above the disc-shaped support seat 30, thereby fixing the driving mechanism 4 on the disc-shaped support seat 30. The mechanism connecting hole and the shell connecting hole 301 are arranged in a circumferential direction. In this way, the linear distance between the two can be reduced without affecting the overall structural strength of the disc-shaped support seat 30.

[0037] Since the driving mechanism 4 is installed on the upper part of the GIS sealed shell 1, in order to prevent water, a waterproof protruding ring is arranged on the lower side of the disc-shaped support seat 30 on the radial outer side of the mechanism connecting hole. In this way, after the rainwater spreads along the outer circumferential surface of the disc-shaped support seat 30 to the lower side, it is blocked by the waterproof protruding ring and cannot spread to the mechanism connecting hole and the shell connecting hole 301. Moreover, a sealing ring is also installed on the upper disc surface of the disc-shaped support seat 30 on the radial outer side of the mechanism connecting hole. After the driving mechanism 4 is installed on the disc-shaped support seat 30, the driving mechanism 4 and the disc-shaped support seat 30 clamp the sealing ring, thereby realizing the sealing between the driving mechanism 4 and the disc-shaped support seat 30.

[0038] Regarding the sealing between the axial sealing section 31 and the transmission structure avoiding hole, specifically, the outer circumferential surface of the axial sealing section 31 is provided with two sealing rings. Of course, the specific form of the sealing structure here is not necessarily the form in the embodiment. For example, a sealing ring can be installed on the inner hole wall of the transmission structure avoiding hole, or the number of sealing rings can be adjusted according to the sealing level requirement.

[0039] Regarding the rotation seal between the mounting hole and the transmission shaft 32, specifically, the mounting hole is a multi-stage stepped hole with the inner diameter gradually decreasing from bottom to top, the transmission shaft 32 is a stepped shaft with a large-diameter middle section and small-diameter end sections, the small-diameter end sections of the transmission shaft 32 are respectively provided with bearings 311, and the large-diameter middle section constitutes a sealing fitting shaft section 321 for sealing fitting with the hole wall of the mounting hole, so that the transmission shaft 32 can be vertically installed in the mounting hole. The lower end bearing 311 is in rotation fitting with the first-stage hole section at the lowermost end of the mounting hole, the large-diameter end of the transmission shaft 32 is in rotation seal fitting with the second-stage hole section above the first-stage hole section, and the upper end bearing 311 is in rotation fitting with the third-stage hole section at the uppermost end of the mounting hole. The upper end of the third-stage hole section is provided with an inner retaining ring for retaining the upper end bearing 311 in the upward direction, and the lower end of the first-stage hole section is provided with a retaining ring installation groove in which a retaining ring is installed for retaining the lower end bearing 311 in the downward direction, so as to ensure the axial fixation of the transmission shaft 32 in the mounting hole. The inner wall surface of the second-stage hole section is provided with two sealing ring installation grooves in which sealing rings are installed, and the sealing rings at this position are in cooperation with the outer peripheral surface of the sealing fitting shaft section 321 to realize rotation seal. In addition, the inner wall surface of the second-stage hole section is further provided with a lubricating grease groove 313 between the two sealing ring installation grooves, and the lubricating grease groove 313 stores lubricating grease for reducing friction generated during the rotation of the transmission shaft 32, and at the same time, the lubricating grease is uniformly spread on the outer peripheral surface of the sealing fitting shaft section 321 to form an oil film seal, further improving the sealing effect. By arranging the lubricating grease groove between the two sealing ring installation grooves, the lubricating grease can be sealed and protected by the sealing rings to avoid the deterioration of the lubricating grease due to dust and water.

[0040] The rotation output end of the driving mechanism 4 supported on the disc-shaped support seat of the GIS of the embodiment is drivingly connected to the upper end of the transmission shaft 32, and the lower end of the transmission shaft 32 is drivingly connected to the movable contact assembly 2 of the break structure, so that when the driving mechanism 4 outputs torque, the movable contact assembly 2 is driven to rotate, thereby realizing the opening and closing actions.

[0041] As known from the above description, the GIS of the embodiment can stably and reliably support the driving mechanism 4 by the driving mechanism support device 3, and through the novel structure design, the driving connection between the driving mechanism 4 and the movable contact assembly 2 inside the sealed shell 1 of the GIS is realized, the sealing at the transmission structure avoiding hole is ensured, the disc-shaped support seat 30 is used to support the driving mechanism 4, the distance between the driving mechanism 4 and the sealed shell 1 is greatly reduced, the occupied space of the GIS in the height direction is reduced, and the miniaturization requirement is more easily met.

[0042] Of course, the GIS of the present application is not limited to the above-mentioned embodiments, and other embodiments in accordance with the concept of the present application are naturally included in the protection scope of the claims of the present application.

[0043] For example, in the above-mentioned embodiment 1, the housing connecting hole is a counterbore hole in order not to affect the direct attachment of the driving mechanism to the upper side of the disc-shaped support seat, and for the same purpose, in other embodiments, the housing connecting hole is a through hole with a consistent diameter, the upper side of the disc-shaped support seat is provided with a convex ring, the mechanism connecting hole is arranged corresponding to the convex ring, a sealing ring is arranged on the convex ring radially outward of the mechanism connecting hole, the upper side of the convex ring forms a support surface, and the upper side of the convex ring is higher than the upper end hole of the housing connecting hole. When the connecting bolt is connected to the sealing housing by being passed through the housing connecting hole, the head of the connecting bolt is not higher than the upper side of the convex ring, and at this time, the convex ring can also play a certain rainproof role.

[0044] For example, in the above-mentioned embodiment 1, the housing connecting hole and the mechanism connecting hole are arranged in a circumferential direction, and in other embodiments, in order to facilitate the machining of the connecting hole on the disc-shaped support seat, the housing connecting hole and the mechanism connecting hole can be arranged corresponding in a radial direction.

[0045] For example, in the above-mentioned embodiment 1, two axially spaced sealing rings are arranged at the position of the sealing fit of the mounting hole and the transmission shaft, and the lubricating grease groove is arranged at the position between the two adjacent sealing rings, and in other embodiments, the sealing ring can be three or even four, and the lubricating grease groove can be arranged between any two adjacent sealing rings. Of course, the present application also does not exclude the mode of having only one sealing ring, and at this time, the lubricating grease groove is preferably arranged on the upper side of the sealing ring, so that the lubricating grease in the lubricating grease groove can seep downward to uniformly cover the sealing fit surface of the transmission shaft.

[0046] For example, in the above-mentioned embodiment 1, the transmission shaft is a stepped shaft structure with a large-diameter middle section and small-diameter end sections, and the bearing is arranged on the small-diameter end sections, and in other embodiments, the transmission shaft can be a cylindrical shaft with a consistent diameter, the mounting hole of the axial sealing section includes a small-diameter middle section and large-diameter end sections, the inner wall surface of the small-diameter middle section is in rotational sealing fit with the outer peripheral surface of the cylindrical shaft, the bearing arranged on the transmission shaft corresponds to the large-diameter end sections, and the inner peripheral surfaces of the large-diameter end sections are respectively provided with a stop ring for stopping the bearing.

[0047] Embodiments of the switch driving mechanism support device of the present application: the specific structure can be the same as that of any one of the driving mechanism support devices in the above-mentioned embodiments of the GIS, and will not be introduced herein.

[0048] The above merely describes preferred embodiments of the present application and is not used to limit the present application, and the patent protection scope of the present application is subject to the claims, and any equivalent structural changes made according to the content of the specification and drawings of the present application should also be included in the protection scope of the present application.

Claims

1. A support device for a switch drive mechanism, characterized in that, The seat structure comprises a disc-shaped support seat (30) and an axial sealing section (31) arranged at the lower side of the disc-shaped support seat (30), the axial sealing section (31) is used for sealingly penetrating into a transmission structure avoiding hole of a GIS sealing shell (1) and has a sealing cooperation structure on the outer circumferential surface thereof for sealingly cooperating with the inner wall of the transmission structure avoiding hole, the disc-shaped support seat (30) has a mechanism connection hole for fixedly connecting with a driving mechanism (4) and for fixedly supporting the driving mechanism (4), an installation hole is arranged in the seat structure in the axial direction and corresponds to the middle position of the axial sealing section (31), a transmission shaft (32) is sealingly and rotatably installed in the installation hole, and the disc-shaped support seat (30) is further provided with a shell connection hole (301) for fixedly connecting with the GIS sealing shell (1); the installation hole is a stepped hole comprising two or more hole sections with increasing inner diameters from top to bottom, and some of the two or more hole sections are rotating cooperation hole sections for installing bearings (311), and some of the two or more hole sections are sealing cooperation hole sections for sealingly cooperating with the outer circumferential surface of the transmission shaft (32), the installation hole is stopper fitted with the transmission shaft (32) or the bearings (311) sleeved on the transmission shaft (32) through the stepped surface thereof, so as to limit the transmission shaft (32).

2. The switch drive mechanism support device according to claim 1, characterized by The shell connection hole (301) is a downwardly extending counterbore, and the upper disc surface of the disc-shaped support seat (30) constitutes a support surface for supporting the driving mechanism (4).

3. The switch drive mechanism support device according to claim 2, characterized by The mechanism connection hole radially outside the shell connection hole (301) is arranged in a circumferential direction offset manner with the shell connection hole (301).

4. The switch driving mechanism support device according to any one of claims 1 to 3, characterized by At least one of the installation hole and the transmission shaft (32) is provided with a lubricating grease groove (313) at the sealing cooperation position thereof.

5. The switch drive mechanism support device according to claim 4, characterized by The installation hole and the transmission shaft (32) are provided with two or more axially spaced sealing rings at the sealing cooperation position thereof, and the lubricating grease groove (313) is arranged at the position between the adjacent two sealing rings.

6. The switch drive mechanism support device according to claim 3, characterized by The upper side of the disc-shaped support seat (30) is provided with a waterproof sealing ring for cooperating with the lower side of the driving mechanism (4) radially outside the mechanism connection hole.

7. The switch drive mechanism support device according to claim 3, characterized by The lower side of the disc-shaped support seat (30) is provided with a rainproof convex ring (303) radially outside the support connection portion.

8. A GIS comprising a sealed enclosure (1) provided with a transmission structure avoidance hole, characterized in that, The transmission structure avoiding hole is provided with the switch driving mechanism support device (3) as claimed in any one of claims 1-7, and the driving mechanism (4) is fixedly supported on the switch driving mechanism support device.

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