Switching mechanism with improved insulation properties and gas-insulated switchgear

Abstract

The utility model relates to a switch mechanism and gas insulated switchgear with improved insulation performance, and the switch mechanism comprises: a transmission main shaft provided with a radially extending mounting hole; a static contact assembly comprising a static contact blade arranged on the radially outer side of the transmission main shaft and spaced apart from the transmission main shaft, and a pair of static shielding members arranged on the two sides of the static contact blade in the axial direction of the transmission main shaft; and a moving contact assembly comprising a moving contact blade fixedly accommodated in the mounting hole of the transmission main shaft and extending beyond the mounting hole, and a pair of moving shielding members arranged on the end portion of the moving contact blade extending beyond the mounting hole, the pair of moving shielding members being arranged on the two side surfaces of the moving contact blade in the axial direction of the transmission main shaft and extending from the mounting hole to the end side of the moving contact blade away from the mounting hole, so that when the moving contact blade moves to the closed position along with the transmission main shaft and is engaged with the static contact blade, the pair of moving shielding members can continuously extend from the mounting hole to between the pair of static shielding members.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to a switch mechanism and a gas-insulated switch cabinet with improved insulation performance. Background Technology

[0002] Gas-insulated switchgear, such as ring main units, is a core device for power distribution and control in power systems, and is widely used in ring power supply networks, urban substations, and new energy power plants. Gas-insulated switchgear typically uses sulfur hexafluoride gas to seal electrical components such as circuit breakers, disconnectors, load switches, and busbars inside a gas chamber to ensure safe and stable operation.

[0003] With the advancement of global carbon neutrality strategies, traditional insulating media such as sulfur hexafluoride (SF6) are gradually being replaced by environmentally friendly gases such as nitrogen and dry air. However, research shows that the insulating strength of these environmentally friendly gases is far lower than that of SF6. Therefore, in order to meet the insulation performance requirements of switchgear, especially the insulation performance requirements of key electrical components such as switching mechanisms that are frequently operated and have complex structures, switchgear needs to adopt measures such as increasing the charging pressure or optimizing the electric field distribution for insulation compensation. However, the former will significantly increase the size of the switchgear and increase the risk of leakage, while the latter will have problems such as complex processes and high manufacturing costs.

[0004] Therefore, there is a demand in this field for a switch mechanism that has high insulation performance, high safety and reliability, and simple structure in gas-insulated switchgear. Utility Model Content

[0005] The present invention aims to provide a switching mechanism with improved insulation performance that can at least solve some of the above-mentioned problems.

[0006] This invention also aims to provide a gas-insulated switchgear that applies the above-described improved switching mechanism.

[0007] According to one aspect of the present invention, a switching mechanism with improved insulation performance is provided, the switching mechanism comprising: a drive shaft having a radially extending mounting hole; a stationary contact assembly including stationary contact blades spaced apart from the drive shaft on the radially outer side of the drive shaft and a pair of stationary shielding members spaced apart on both sides of the stationary contact blades in the axial direction of the drive shaft relative to the stationary contact blades; and a moving contact assembly including a moving contact blade fixedly received in the mounting hole of the drive shaft and extending beyond the mounting hole, and a pair of moving shielding members disposed at the ends of the moving contact blades extending beyond the mounting hole, the pair of moving shielding members being respectively disposed on both sides of the moving contact blades in the axial direction of the drive shaft and extending from the mounting hole to the end of the moving contact blades away from the mounting hole, such that when the moving contact blades move with the drive shaft to the closed position and engage with the stationary contact blades, the pair of moving shielding members can continuously extend from the mounting hole to between the pair of stationary shielding members.

[0008] Compared with existing technologies, the switching mechanism of this invention improves installation convenience and motion stability of the moving contact assembly by mounting the moving contact assembly to the mounting hole of the drive shaft. Furthermore, the switching mechanism provides a pair of stationary shielding members on both sides of the stationary contact blade and a pair of moving shielding members on both sides of the moving contact blade. These moving shielding members extend continuously from the mounting hole of the drive shaft to the end side away from the drive shaft on the surface of the moving blade and are located between the pair of stationary shielding members, thereby maximizing the uniformity of the electric field. This significantly improves the insulation performance of the switching mechanism without increasing the insulation distance, thus avoiding increasing the overall space occupied by the switching mechanism and making it suitable for low-pressure applications.

[0009] Preferably, the moving contact blade is configured as a pair of moving blades spaced apart from each other in the axial direction of the drive spindle, and the surface of each moving blade extending beyond the mounting hole and facing the other moving blade is designed as a flat surface; the stationary contact blade has engagement protrusions on both surfaces in the axial direction of the drive spindle, and the surface of the engagement protrusions facing away from the stationary contact blade is designed as a flat surface, so that when the stationary contact blade is clamped between the ends of the pair of moving blades extending beyond the mounting hole, the flat surface of each moving blade contactes the flat surface of the engagement protrusion of the stationary contact blade.

[0010] Preferably, the pair of moving shields are respectively installed on the surface of each moving knife gate facing away from the other moving knife gate in the pair of moving knife gates, and each moving shield includes a first shielding section adjacent to the mounting hole, a second shielding section adjacent to the stationary contact knife, and a third shielding section located between the first shielding section and the second shielding section and smoothly transitioning with the first shielding section and the second shielding section in the radial direction of the transmission main shaft, wherein the third shielding section is recessed relative to the first shielding section and the second shielding section in the direction away from the corresponding moving knife gate and is provided with a through shielding connection hole thereon.

[0011] Preferably, the mounting hole is designed to penetrate radially along the drive shaft so that the end of the moving contact blade away from the stationary contact blade extends beyond the mounting hole; the moving contact assembly also includes a pair of additional moving shields arranged axially along the drive shaft on both sides of the end of the moving contact blade away from the stationary contact blade.

[0012] Preferably, the stationary contact assembly further includes a stationary shielding connector that connects the pair of stationary shielding members to the end side of the pair of stationary shielding members away from the drive spindle. The stationary shielding connector is integrally formed with the pair of stationary shielding members and is used to mount the stationary contact blade thereon.

[0013] Preferably, the drive spindle is injection molded from an insulating material, and a pair of baffles are also formed on the drive spindle. The pair of baffles are arranged on both sides of the mounting hole and extend away from the drive spindle in a direction transverse to the axial direction of the drive spindle.

[0014] Preferably, both ends of the transmission spindle are provided with closing limit features to restrict the movement of the transmission spindle when it moves into place toward the closing position.

[0015] Preferably, the switching mechanism further includes a grounding contact assembly, which is arranged radially outward of the drive shaft relative to the drive shaft and located on the other side of the moving contact assembly relative to the stationary contact assembly, so that the moving contact assembly can engage with the moving contact assembly when it moves with the drive shaft to the grounding position.

[0016] Preferably, the transmission spindle is further provided with grounding limiting features at both axial ends to restrict the movement of the transmission spindle when it moves into place toward the grounding position.

[0017] According to another aspect of the present invention, a gas-insulated switchgear is also provided, characterized in that the gas-insulated switchgear includes the aforementioned switch mechanism with improved insulation performance.

[0018] Other features and advantages of this invention will partly be apparent to those skilled in the art upon reading this application, and partly will be described below in conjunction with the accompanying drawings in the detailed description. Attached Figure Description

[0019] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a perspective view of the switching mechanism in the closed position according to an embodiment of the present invention;

[0021] Figure 2 This is a partial perspective view of the switching mechanism in the closed position according to an embodiment of the present invention;

[0022] Figure 3 This is a perspective view of the stationary contact assembly, moving contact assembly, and grounding contact assembly of the switching mechanism according to an embodiment of the present invention in the closed position;

[0023] Figure 4 This is a side view of the switching mechanism in the closed position according to an embodiment of the present invention;

[0024] Figure 5 This is a perspective view of the stationary contact blade of the switching mechanism according to an embodiment of the present invention;

[0025] Figure 6 This is a perspective view of the moving contact blade of the switching mechanism according to an embodiment of the present invention;

[0026] Figure 7 This is a perspective view of the transmission shaft of the switching mechanism according to an embodiment of the present invention;

[0027] Figure 8a This is a perspective view of the stationary contact assembly, moving contact assembly, and grounding contact assembly of the switching mechanism according to an embodiment of the present invention in the open position;

[0028] Figure 8b This is a side view of the switching mechanism in the open position according to an embodiment of the present invention;

[0029] Figure 9a This is a perspective view of the stationary contact assembly, moving contact assembly, and grounding contact assembly of the switching mechanism according to an embodiment of the present invention in the grounding position;

[0030] Figure 9b This is a side view of the switching mechanism in the grounded position according to an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100-Switch mechanism; 10-Main body of mechanism; 11-Support plate; 12-Support frame; 13-Support column; 14-Closing stop; 15-Grounding stop; 20-Transmission main shaft; 21-Mounting hole; 22-Shielding plate; 23-Closing limit feature; 24-Grounding limit feature; 26-Additional shielding plate; 30-Static contact assembly; 31-Static contact blade; 311-Connecting protrusion; 32-Static shield; 33-Static shielding connector; 40-Moving contact assembly; 41-Moving contact blade; 411-Moving knife switch; 42-Moving shield; 421-First shielding section; 422-Second shielding section; 423-Third shielding section; 424-Shielding connection hole; 43-Additional shield; 50-Grounding contact assembly; 51-Grounding support plate; 52-Grounding contact blade. Detailed Implementation

[0033] The schematic scheme of the switching mechanism in the gas-insulated switchgear disclosed in this utility model is now described in detail with reference to the accompanying drawings. Although the drawings are provided to illustrate some embodiments of this utility model, the drawings are not necessarily drawn to the dimensions of the specific embodiments, and certain features may be enlarged, removed, or partially cut to better illustrate and explain the disclosure of this utility model. Some components in the drawings may be repositioned according to actual needs without affecting the technical effect. The phrase "in the drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0034] Certain directional terms used in the description of the accompanying drawings below, such as “inner,” “outer,” “above,” “below,” and other directional terms, will be understood to have their normal meaning and refer to those directions as normally viewed in the accompanying drawings. Unless otherwise specified, the directional terms used in this specification are generally in accordance with the conventional directions understood by those skilled in the art.

[0035] The terms “first,” “first,” “second,” “second,” and similar terms used in this utility model do not indicate any order, quantity, or importance, but are used to distinguish one component from other components.

[0036] The terms "joining", "connection" and similar terms used in this utility model include both indirect connection of two components with the aid of an intermediate layer such as an adhesive or welding agent or an intermediate component such as a connector or transition piece, and direct connection of two components without the aid of any intermediate layer such as an adhesive or welding agent or an intermediate component such as a connector or transition piece.

[0037] Figures 1 to 9bThe example illustrates a switching mechanism 100 within a gas-insulated switchgear. This example demonstrates a simple and ingenious design for the switching mechanism 100, optimizing its electric field distribution and improving its insulation performance without increasing the cabinet volume or gas pressure of the applied gas-insulated switchgear. This enhances the safety and reliability of the gas-insulated switchgear and expands its applicability, for example, to low-pressure applications. Figures 1 to 2 As shown, the switching mechanism 100 may include a mechanism body 10, a transmission main shaft 20, a stationary contact assembly 30, and a moving contact assembly 40.

[0038] In the illustrated embodiment, the main body 10 supports the drive shaft 20, the stationary contact assembly 30, and the moving contact assembly 40. Specifically, it may include a pair of support plates 11 spaced apart from each other and a support frame 12 fixedly connected between the pair of support plates 11. The drive shaft 20 is rotatably connected between the pair of support plates 11, generally parallel to the support frame 12; that is, the axial direction of the drive shaft 20 is generally parallel to the extending direction of the support frame 12, and it can be controlled to rotate relative to the main body 10. The drive shaft 20 may be provided with radially extending mounting holes 21 for mounting the moving contact assembly 40 therein, thereby allowing the moving contact assembly 40 to switch between different positions, such as the open and closed positions, following the drive shaft 20. The stationary contact assembly 30 can be fixedly mounted between the pair of support plates 11 of the main body 10 to allow the drive shaft 20 and the moving contact assembly 40 to rotate relative to the stationary contact assembly 30.

[0039] The stationary contact assembly 30 may include a stationary contact blade 31 and a pair of stationary shielding members 32, and the moving contact assembly 40 may include a moving contact blade 41 and a pair of moving shielding members 42.

[0040] The stationary contact blade 31 is arranged at intervals relative to the drive shaft 20 on its radially outer side, and the thickness direction of the stationary contact blade 31 extends along the axial direction of the drive shaft 20. A pair of stationary shielding members 32 made of metal are arranged at intervals on both sides of the stationary contact blade 31 in the axial direction of the drive shaft 20, that is, on both sides in the thickness direction of the stationary contact blade 31. Correspondingly, the moving contact blade 41 is fixedly received in the mounting hole 21 of the drive shaft 20 and extends out of the mounting hole 21, and the thickness direction of the moving contact blade 41 also extends along the axial direction of the drive shaft 20. The moving contact blade 41 and the stationary contact blade 31 are arranged with substantially the same orientation so that the moving contact blade 41 and the stationary contact blade 31 can engage with each other or disengage from each other. A pair of moving shields 42 made of metal material can be arranged on both sides of the moving contact knife 41 in the axial direction of the transmission main shaft 20, that is, on both sides of the moving contact knife 41 in the thickness direction, and can extend continuously from the mounting hole 21 to the end of the moving contact knife 41 away from the mounting hole 21.

[0041] Therefore, when the switching mechanism 100 is in Figures 1 to 4 In the closed position shown, the extension direction of the mounting hole 21 of the drive shaft 20 is opposite to that of the stationary contact assembly 30. The moving contact 41 extending from the mounting hole 21 can engage with the stationary contact 31. A pair of moving shields 42 located on both sides of the moving contact 41 are also located between the pair of stationary shields 32. Furthermore, the moving contact 41 can extend continuously from the mounting hole 21 to the end of the moving contact 41 away from the mounting hole 21, i.e., the end adjacent to the stationary contact 31. When it is necessary to move the switching mechanism 100 from the closed position to... Figure 8a and Figure 8b When the switch is in the open position as shown, the drive shaft 20 can drive the moving contact 41 and the moving shield 42 thereon to rotate out from the pair of stationary shields 32, and the moving contact 41 will then disengage from the stationary contact 31. In this way, the insulation performance of the switch mechanism 100 provided by this utility model is greatly improved.

[0042] Understandably, the switching mechanism 100 is generally suitable for controlling three-phase current. Therefore, the transmission main shaft 20 may be provided with three mounting holes 21 spaced apart along the axial direction, three moving contact assemblies 40 respectively mounted to the three mounting holes 21, three stationary contact assemblies 30 respectively cooperating with the three moving contact assemblies 40, and three grounding contact assemblies 50 respectively cooperating with the three moving contact assemblies 40 as described later. Considering that the cooperation between each mounting hole 21 and the corresponding moving contact assembly 40 and between each moving contact assembly 40 and the corresponding stationary contact assembly 30 is basically the same as described above, it will not be repeated.

[0043] Optionally, such as Figures 2 to 3 as well as Figures 5 to 6 As shown, the moving contact blade 41 can be configured as a pair of moving blade gates 411 spaced apart from each other in the axial direction of the drive spindle 20. These moving blade gates 411 can be connected to each other via elastic members to elastically clamp the stationary contact blade 31 between the moving blade gates 411 when engaged with the stationary contact blade 31, thereby increasing the contact force between the stationary contact blade 31 and the moving contact blade 41. Specifically, the moving blade gate 411 can be fixedly received in and extend out of the mounting hole 21 of the drive spindle 20, and the surface of the moving blade gate 411 extending beyond the mounting hole 21 and facing the other moving blade gate 411 can be designed as a flat surface.

[0044] Correspondingly, the stationary contact 31 may have engagement protrusions 311 on both surfaces of the axial surface (thickness direction side) of the transmission main shaft 20. Each engagement protrusion 311 may be an arc-shaped protrusion protruding relative to the stationary contact 31, which makes the overall thickness of the stationary contact 31 and the engagement protrusions 311 gradually increase. This facilitates the stationary contact 31 to be screwed into and clamped between the ends of the mounting holes 21 extending beyond the pair of moving knife gates 411 when the switching mechanism 100 moves to the closed position, and also increases the contact force between the stationary contact 31 and the moving contact 41. In addition, the surface of each engagement protrusion 311 facing away from the stationary contact 31 may be provided as a flat surface, so that when the stationary contact 31 is clamped between the pair of moving knife gates 411, the flat surface of the engagement protrusion 311 of the stationary contact 31 contacts the flat surface of the moving knife gate 411. The contact between the stationary contact 31 and the pair of moving knife gates 411 is thus a line contact, which greatly improves the closing reliability of the switching mechanism 100.

[0045] Optionally, such as Figure 3 and Figure 8a As shown, a pair of moving shields 42 can be respectively installed on the surface of each of the moving knife gates 411 facing away from the other moving knife gate 411, and the moving shields 42 can include a first shielding section 421, a second shielding section 422, and a third shielding section 423 in the radial direction of the transmission main shaft 20, i.e., the extending direction of the moving knife gate 411. The first shielding section 421 is arranged adjacent to the mounting hole 21, the second shielding section 422 is arranged adjacent to the stationary contact knife 31, and the third shielding section 423 can smoothly transition between the first shielding section 421 and the second shielding section 422 and relative to the first shielding section 421 and the second shielding section 422.

[0046] The surfaces of the first shielding section 421, the second shielding section 422, and the third shielding section 423 facing away from the corresponding movable knife switch 411 are all designed as curved surfaces. Furthermore, the third shielding section 423 is recessed relative to the first shielding section 421 and the second shielding section 422 in the direction away from the corresponding movable knife switch 411. This allows for the opening of a shielding connection hole 424 that extends axially along the transmission main shaft 20 in the third shielding section 423. Therefore, the shielding connection hole 424 is also recessed relative to the first shielding section 421 and the second shielding section 422 in the direction away from the corresponding movable knife switch 411. This ensures that the ends of the shielding connectors that fix the pair of movable shielding members 42 to the pair of movable knife switches 411 through the shielding connection holes 424 will not extend beyond the first shielding section 421 and the second shielding section 422 in the direction away from the corresponding movable knife switch 411, thereby improving the insulation performance of the switching mechanism 100 provided by this utility model.

[0047] Furthermore, combined Figure 8a and 8bAs shown, the first shielding section 421, the second shielding section 422 and the third shielding section 423 extend beyond the two sides of the corresponding moving knife gate 411 in a direction transverse to the axial direction of the transmission main shaft 20. Furthermore, the two sides of the periphery of the first shielding section 421 and the third shielding section 423 in the direction transverse to the axial direction of the transmission main shaft 20, i.e. the width direction of the corresponding moving knife gate 411, can extend in an arc toward another moving shield 42 until they cover the corresponding moving knife gate 411 in the thickness direction.

[0048] Optionally, such as Figures 1 to 3 As shown, the mounting hole 21 of the drive shaft 20 can be designed to penetrate radially through the drive shaft 20, so that the moving contact blades 41, i.e., a pair of moving blade gates 411, can be fixedly housed within the mounting hole 21 of the drive shaft 20, with both ends extending beyond the two side openings of the mounting hole 21. The end of the moving blade gate 411 extending beyond the mounting hole 21 away from the rotation center of the drive shaft 20 is used to engage with the stationary contact blade 31. The end of the moving blade gate 411 extending beyond the mounting hole 21 near the rotation center of the drive shaft 20, i.e., away from the stationary contact blade 31, is used to rotatably connect with the support column 13 on the support frame 12 of the mechanism body 10, thereby allowing the moving blade gate 411 to rotate around the end of the moving blade gate 411 away from the stationary contact blade 31.

[0049] Furthermore, the moving contact assembly 40 may also include a pair of additional shielding members 43. The arrangement of the pair of additional shielding members 43 relative to the ends of the moving contact 41 away from the stationary contact 31 is substantially the same as the arrangement of the pair of moving shielding members 42 relative to the ends of the moving contact 41 adjacent to the stationary contact 31. That is, the pair of additional shielding members 43 may be arranged axially along the drive shaft 20 at the ends of the pair of moving knife switches 411 away from the stationary contact 31 and respectively on the surface of each knife switch facing away from the other moving knife switch 411, for further improving insulation performance. The additional shielding members 43 may be generally designed to have a circular outer periphery, and their surface facing away from the corresponding moving knife switch 411 may be recessed to form a connecting hole for fixing the additional shielding members 43 to the moving knife switch 411 by means of additional fasteners.

[0050] Optionally, such as Figures 1 to 3 as well as Figure 5 As shown, the stationary contact assembly 30 may further include a stationary shielding connector 33 for further improving the insulation performance of the switching mechanism 100 provided by this invention. A pair of stationary shielding members 32 are generally designed to be arranged parallel to the stationary contact blade 31 on both sides in the thickness direction of the stationary contact blade 31, with the periphery of each stationary shielding member 32 extending arc-shaped toward the other stationary shielding member 32, so that the surfaces of the stationary shielding members 32 facing away from the other stationary shielding member 32 are smoothly arranged. Thus, the stationary shielding connector 33 can be used to connect the ends of the pair of stationary shielding members 32 away from the drive shaft 20 and to smoothly transition with the stationary shielding members 32.

[0051] Furthermore, the static shielding connector 33 can be integrally formed with a pair of static shielding members 32. This integral component can be considered to have openings on both sides in the direction transverse to the drive shaft 20 and on the side facing the drive shaft 20, so as to allow the moving contact assembly 40 to screw into and out of the pair of static shielding members 32. The static shielding connector 33 may be provided with a through contact connection hole, so that the static contact blade 31 passes through the contact connection hole into the pair of static shielding members 32 and is fastened to the static shielding connector 33 by fasteners.

[0052] Optionally, such as Figures 1 to 2 as well as Figure 7 As shown, the drive spindle 20 can be designed as a frame structure injection molded from insulating material. This not only improves the mechanical strength of the drive spindle 20, but also allows the drive spindle 20 to have a near-symmetrical structural design with good straightness, thereby effectively improving the insulation margin. Three pairs of baffles 22 corresponding to the mounting holes 21 can also be formed on the drive spindle 20. For one pair of baffles 22, these baffles 22 can be arranged transversely to the axial direction of the drive spindle 20 on both sides of the corresponding mounting holes 21 and extend away from the drive spindle 20 toward the moving shield 42. This allows the pair of baffles 22 to block a portion of the moving knife gate 411 extending beyond the mounting holes 21 and adjacent to the end of the stationary contact knife 31, thereby further optimizing the electric field distribution.

[0053] Furthermore, the drive shaft may also have three pairs of additional shielding plates 26 corresponding to the mounting holes 21. For one pair of additional shielding plates 26, the pair of shielding plates 26 may be arranged on both sides of the corresponding mounting holes 21 in a direction transverse to the axial direction of the drive shaft 20 and extend toward the additional shielding member 43, so that the pair of additional shielding plates 26 can block a portion of the end of a pair of moving knife gates 411 that extends beyond the mounting holes 21 and away from the stationary contact knife 31, thereby further optimizing the electric field distribution.

[0054] Optionally, such as Figures 1 to 2 as well as Figures 3 to 4 The closing position shown Figures 8a to 8b The indicated tripping position and Figures 9a to 9b As shown in the grounding position, the switching mechanism 100 may further include a grounding contact assembly 50, which includes a grounding support plate 51 fixedly installed between a pair of support plates 11 of the mechanism body 10 and arranged generally parallel to the drive shaft 20, and a grounding contact blade 52 arranged on the grounding support plate 51. The grounding contact blade 52 is located radially outside the drive shaft 20 and on the other side of the moving contact assembly 40 relative to the stationary contact assembly 30, so that the moving knife switch 411 can engage with the stationary contact blade 31 when it moves from the open position toward the stationary contact assembly 30 to the closed position, or engage with the grounding contact blade 52 when it moves toward the grounding contact assembly 50 to the grounding position.

[0055] Furthermore, combined Figure 7 As shown, both ends of the transmission main shaft 20 can be provided with a closing limit feature 23 and a grounding limit feature 24, which can respectively cooperate with the closing stop member 14 and the grounding stop member 15 on the main body 10 of the mechanism. In the illustrated embodiment, both the closing limit feature 23 and the grounding limit feature 24 can be designed as recesses with groove walls extending along an arc. Both the closing stop member 14 and the grounding stop member 15 can be cylindrical structures extending from the support plate 11 toward the transmission main shaft 20, so that the closing stop member 14 and the grounding stop member 15 can fall into the closing limit feature 23 and the grounding limit feature 24 respectively.

[0056] Therefore, when the knife switch 411 is moved, it can be used from Figure 8b When the shown open position is rotated clockwise to engage with the stationary contact 31, the closing limit feature 23 on the transmission main shaft 20 abuts against the closing stop 14 to effectively reduce the overshoot generated during the closing operation of the switching mechanism 100. When the moving knife switch 411 moves from... Figure 8b When the switch is rotated counterclockwise to engage with the grounding contact 52, the grounding limiting feature 24 on the transmission main shaft 20 abuts against the grounding stop 15, effectively reducing the overshoot generated during the grounding operation of the switch mechanism 100. Therefore, the safety of the switch mechanism 100 and the gas-insulated switchgear used in this invention is improved.

[0057] It should be understood that although this specification describes various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0058] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A switching mechanism (100) with improved insulation performance, characterized in that, The switching mechanism (100) includes: The drive spindle (20) has a radially extending mounting hole (21); A stationary contact assembly (30) includes a stationary contact blade (31) arranged at intervals relative to the drive shaft (20) on the radially outer side of the drive shaft (20) and a pair of stationary shields (32) arranged at intervals on both sides of the stationary contact blade (31) in the axial direction of the drive shaft (20) relative to the stationary contact blade (31). The moving contact assembly (40) includes a moving contact blade (41) fixedly housed in a mounting hole (21) of the drive shaft (20) and extending beyond the mounting hole (21), and a pair of moving shields (42) arranged at the ends of the moving contact blade (41) extending beyond the mounting hole (21). The pair of moving shields (42) are respectively arranged on both sides of the moving contact blade (41) in the axial direction of the drive shaft (20) and extend from the mounting hole (21) to the end of the moving contact blade (41) away from the mounting hole (21), so that when the moving contact blade (41) moves with the drive shaft (20) to the closed position and engages with the stationary contact blade (31), the pair of moving shields (42) can continuously extend from the mounting hole (21) to between the pair of stationary shields (32).

2. The switching mechanism (100) with improved insulation performance according to claim 1, characterized in that, The moving blade (41) is configured as a pair of moving blades (411) spaced apart from each other in the axial direction of the drive shaft (20). The surface of each moving blade (411) extending beyond the mounting hole (21) and facing the other moving blade (411) is designed as a flat surface. The stationary blade (31) has engagement protrusions (311) on both surfaces in the axial direction of the drive shaft (20), and the surface of the engagement protrusion facing away from the stationary blade (31) is designed as a flat surface so that when the stationary blade (31) is clamped between the ends of the pair of moving blades (411) extending beyond the mounting hole (21), the flat surface of each moving blade (411) contacts the flat surface of the engagement protrusion (311) of the stationary blade (31).

3. The switching mechanism (100) with improved insulation performance according to claim 2, characterized in that, The pair of moving shields (42) are respectively installed on the surface of each moving knife gate (411) facing away from the other moving knife gate (411) in the pair of moving knife gates (411), and each moving shield (42) includes a first shield section (421) adjacent to the mounting hole (21), a second shield section (422) adjacent to the stationary contact knife (31) and a third shield section (423) located between the first shield section (421) and the second shield section (422) and smoothly transitioning with the first shield section (421) and the second shield section (422) in the radial direction of the transmission main shaft (20), wherein the third shield section (423) is recessed relative to the first shield section (421) and the second shield section (422) in the direction away from the corresponding moving knife gate (411) and is provided with a through shield connection hole (424).

4. The switching mechanism (100) with improved insulation performance according to claim 1, characterized in that, The mounting hole (21) is designed to penetrate radially along the drive shaft (20) so that the end of the moving contact (41) away from the stationary contact (31) extends beyond the mounting hole (21); the moving contact assembly (40) also includes a pair of additional moving shields (42) arranged axially on both sides of the end of the moving contact (41) away from the stationary contact (31).

5. The switching mechanism (100) with improved insulation performance according to claim 1, characterized in that, The stationary contact assembly (30) further includes a stationary shielding connector (33) that connects the pair of stationary shielding members (32) to the end side of the pair of stationary shielding members (32) away from the drive shaft (20). The stationary shielding connector (33) is integrally formed with the pair of stationary shielding members (32) and is used to mount the stationary contact blade (31) thereon.

6. The switching mechanism (100) with improved insulation performance according to claim 1, characterized in that, The drive shaft (20) is injection molded from insulating material, and a pair of baffles (22) are also formed on the drive shaft (20). The pair of baffles (22) are arranged on both sides of the mounting hole (21) and extend away from the drive shaft (20) in a direction transverse to the axial direction of the drive shaft (20).

7. The switching mechanism (100) with improved insulation performance according to claim 6, characterized in that, Both ends of the transmission spindle (20) are provided with closing limit features (23) to restrict the movement of the transmission spindle (20) when it moves to the closing position.

8. The switching mechanism (100) with improved insulation performance according to claim 6, characterized in that, The switching mechanism (100) further includes a grounding contact assembly (50), which is arranged radially outward of the drive shaft (20) at a distance from the drive shaft (20) and located on the other side of the moving contact assembly (40) relative to the stationary contact assembly (30), so that the moving contact assembly (40) can engage with the moving contact assembly (40) when it moves with the drive shaft (20) to the grounding position.

9. The switching mechanism (100) with improved insulation properties according to claim 8, characterized in that, The transmission spindle (20) is also provided with grounding limiting features (24) at both axial ends to restrict the movement of the transmission spindle (20) when it moves to the grounding position.

10. A gas-insulated switchgear, characterized in that, The gas-insulated switchgear includes a switching mechanism (100) with improved insulation performance according to any one of claims 1 to 9.

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