CN111952110A - Solid insulating cylinder - Google Patents

Abstract

The invention provides a solid insulating cylinder, and belongs to the technical field of power equipment. It has solved the poor problem of current solid insulating cylinder suitability. This solid insulating cylinder includes barrel and conductive component and shielding net, conductive component includes inlet wire conducting rod and vacuum switch tube, the barrel inner chamber is equipped with the switch, shielding net is including shielding net one and the shielding net two of cover in inlet wire conducting rod inner end department, shielding net one includes both ends opening and has the body and a pair of convex shielding piece along switch working direction from the body upper end with the same cross sectional shape of barrel, two shielding pieces are just to setting up, vacuum switch tube moves the end and is located the body inboard, switch is located the body inboard when conductive component breaks off, the switch that connecting hole to articulated point department is located two shielding pieces and the body inboard and the other end of switch is located shielding net two inboards when conductive component switches on. The solid insulating cylinder has the advantages of wide applicability, good insulating property, high safety and the like.

Description

Solid insulating cylinder

Technical Field

The invention belongs to the technical field of power equipment, and relates to a solid insulating cylinder.

Background

In a solid switch cabinet, a solid insulating cylinder is generally used to insulate each conductive part from the external environment, so the safety and reliability of a power transmission and distribution system are directly affected by the performance of the solid insulating cylinder. The zinc-sprayed ground protection is not made on the surface of the traditional solid insulating cylinder, the partial discharge index is unstable, once discharge occurs, insulation cannot be recovered, meanwhile, the discharge can be continuously increased and expanded in the service life, and finally insulation breakdown and interphase short circuit fault can occur.

In order to solve the above problems, the chinese patent discloses a solid insulation cylinder with application number 201520008782.3, which comprises a cylindrical body made of an insulating material, wherein the outer end of the body is open, the inner end of the body is provided with a conductive connecting member, the inner end of the connecting member is located in the body, the outer end of the connecting member can extend out of the body from the side part of the body, the outer side of the body is coated with a cylindrical conductive shielding net, the axial direction of the shielding net is consistent with the axial direction of the body, and the inner end of the connecting member is located at the inner side of the shielding net; the connecting piece specifically comprises a first connecting piece and a second connecting piece, the first connecting piece comprises a first connecting rod and a vacuum switch tube fixedly connected in the body, the inner end of the first connecting rod is connected with the outer end of the vacuum switch tube, the outer end of the first connecting rod can extend out of the body, the shielding net comprises a first shielding portion, a second shielding portion and a bending portion connected with the first shielding portion and the second shielding portion, the inner end of the vacuum switch tube is located in the first shielding portion, and the inner end of the second connecting piece is located in the second shielding portion. When the vacuum switch tube is used specifically, a switch knife switch is arranged in the body, one end of the switch knife switch is hinged with the body and is electrically connected with the inner end of the vacuum switch tube, meanwhile, the middle part of the switch knife switch is connected with an insulating pull rod capable of moving, and the switch knife switch is driven to swing around a hinged point with the body through the insulating pull rod, so that the other end of the switch knife switch can be in contact with the inner end of the second connecting piece, and the vacuum switch tube is conducted with the second connecting piece. After the switch knife switch conducts the vacuum switch tube and the second connecting piece, the movable end of the vacuum switch tube, the switch knife switch and the inner end of the second connecting piece are wrapped in the shielding net, and all the positions are located at equal potential, so that point discharge at all the electric connection positions in a working state is eliminated, and the local discharge characteristic is improved.

In the practical process, under the condition that the interior of the vacuum switch tube is always connected, when the switch knife switch disconnects the connection between the first connecting piece and the second connecting piece, the first connecting piece is grounded in a low potential state, and the second connecting piece, the moving end of the vacuum switch tube and the switch knife switch are still in a high potential state. The solid insulating cylinder can effectively solve the partial discharge phenomenon during working, but the disconnected switch is not coated in the shielding net, so that high-voltage shielding in the state cannot be realized, good insulating property cannot be always kept, the service life is influenced, and certain potential safety hazards exist. Since the internal connection of the vacuum switch tube is an important factor of the high-voltage state when the switch knife switch is disconnected, for the situation, a person skilled in the art can easily think that the alarm can be given when the switch knife switch is disconnected but the internal of the vacuum switch tube is still connected, so that the device can automatically disconnect the internal of the vacuum switch tube.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a solid insulating cylinder which solves the problem of unstable insulating property.

The purpose of the invention can be realized by the following technical scheme:

the solid insulating cylinder comprises a cylinder body, a conductive component and a shielding net embedded in the cylinder body, wherein the lower end of the cylinder body is provided with an opening, the conductive component comprises an incoming line conductive rod with the inner end positioned in an inner cavity of the cylinder body and a vacuum switch tube with the moving end positioned in the inner cavity of the cylinder body, the inner cavity of the cylinder body is provided with a switch knife gate with one end hinged with the inner end of the incoming line conductive rod and capable of controlling the moving end of the vacuum switch tube to be connected with or disconnected from the inner end of the incoming line conductive rod, and the middle part of the switch knife gate is provided with a connecting hole. When the conductive assembly is conducted, the switch disconnecting link from the connecting hole to the hinge point is positioned on the inner sides of the two shielding sheets and the body, and the other end of the switch disconnecting link is positioned on the inner side of the shielding net.

During the use, the solid insulation section of thick bamboo is fixed at the internal of the cabinet of solid cubical switchboard, and the internal operating device that is equipped with of cabinet of solid cubical switchboard, operating device include an insulating pull rod that can move about, will insulate pull rod upper end and switch knife switch and be connected through the cooperation of fastener with the connecting hole, just so can control switch knife switch when insulating pull rod action around the pin joint swing with the barrel to the break-make of control conductive component.

In an initial state, the incoming line conducting rod and the vacuum switch tube are in a disconnected state (namely, the conducting component is disconnected, and meanwhile, the inside of the vacuum switch tube is also in a disconnected state), at the moment, the moving end of the vacuum switch tube and the switch knife switch are both positioned on the inner side of the body of the first shielding net, and the first shielding net and the second shielding net are both in a low potential state. When the conducting component needs to be conducted, the inside of the vacuum switch tube is firstly controlled to be conducted, then the insulating pull rod pushes the switch disconnecting link to swing upwards around a hinged point of the switch disconnecting link and the tube body, the switch disconnecting link is contacted with the incoming line conducting rod to conduct the conducting component, and the switch disconnecting link from the connecting hole to the hinged point of the switch disconnecting link and the tube body is positioned on the inner sides of the two shielding sheets and the body, so that the phenomenon of point discharge possibly existing at the electric connection part of the moving end of the vacuum switch tube and the switch disconnecting link, the hinged point of the switch disconnecting link and the tube body and the connecting hole on the switch disconnecting link is eliminated, and the electric field intensity at; the other end of the switch knife switch is positioned at the inner side of the second shielding net, so that the point discharge phenomenon at the electric connection part of the switch knife switch and the incoming line conducting rod is eliminated, and the electric field intensity at the inner end of the incoming line conducting rod is reduced by the second shielding net. Namely, the first shielding net and the second shielding net are both at high potential in the state, so that high-voltage shielding during switching of the disconnecting link in the working state is realized, and the insulating property is ensured. When the vacuum switch tube is still conducted, the switch knife switch is disconnected, and the body of the shielding net I has the same cross section shape as the cylinder body, the switch knife switch is completely positioned on the inner side of the body, the shielding net II is at a low potential, and the shielding net I is at a high potential, so that high-voltage shielding of the switch knife switch in the state is realized, and the insulating property is ensured.

This solid insulating cylinder sets up the shielding net into shielding net one and shielding net two to with shielding net one set up to including both ends opening and have with the body of the same cross section shape of barrel and a pair of from body one end along the convex shielding piece of switch working direction, make no matter at operating condition or non-operating condition homoenergetic realize high-pressure shielding, realized the full shielding promptly, even the inside electric field of solid insulating cylinder and improved its partial discharge characteristic, especially prolonged life and improved security and insulating properties.

In the solid insulating cylinder, the shielding sheet is triangular, the shielding sheet is positioned in the middle of the upper end of the body, and two side faces of the shielding sheet are flush with two side faces of the body.

The shielding piece is triangle-shaped and is located body one end middle part department, and the position of connecting hole is located the middle part department of switch simultaneously, consequently the connecting hole place just in time is located between two shielding pieces when the swing of switch switches on conductive component to make this solid insulation section of thick bamboo also can realize the shielding under operating condition, guaranteed insulating stability.

In the solid insulating cylinder, the shielding sheet and the body are of an integral structure.

The shielding piece and the body are of an integrated structure, so that the insulation performance is more stable.

In foretell solid insulating cylinder, shielding net two including be the main part of U type and with main part one side confined base plate, run through in the main part and be provided with the hole of stepping down the same with the inner shape of inlet wire conducting rod, inlet wire conducting rod inner stretches into in the opening of main part and the inlet wire conducting rod between the inner and the base plate fixed mutually through the fastener through the hole of stepping down.

The shielding net is directly embedded into the cylinder body when the cylinder body is molded by epoxy casting, wherein the U-shaped structures on the shielding net II correspond to the two sides of the cylinder body and the joints of the two sides of the cylinder body, and the substrate corresponds to the inner end part of the cylinder body. The inner end of the incoming line conducting rod extends into the inner side of the main body of the shielding net II through the abdicating hole, then the inner end of the incoming line conducting rod is fixed with the substrate through the fastener, thus the position of the incoming line conducting rod and the position of the shielding net II can be ensured to be positioned when the barrel is molded by epoxy casting, the inner end of the incoming line conducting rod can be naturally positioned at the inner side of the shielding net II after the barrel is molded, and the electric connection part of the switch knife gate and the incoming line conducting rod can be covered by the shielding net I when the switch knife gate swings to conduct the incoming line conducting rod and the vacuum switch tube, thereby eliminating the discharge phenomenon at the position to prolong the service life.

In the solid insulating cylinder, the conductive assembly further comprises an outgoing line conductive rod, the inner end of the outgoing line conductive rod is fixedly communicated with the static end of the vacuum switch tube through a fastener, the shielding net further comprises a cap-shaped shielding net III, the shielding net III covers the static end of the vacuum switch tube, notches are formed in three sides of the shielding net, the inner end of the outgoing line conductive rod extends into the shielding net III through the notches, and the outgoing line conductive rod is fixed with the shielding net tee through the fastener.

Through the setting of shielding net three, can shield the electrically conductive department of being qualified for the next round of competitions conducting rod and the quiet end of vacuum switch tube, avoid this department the phenomenon of discharging to appear, make the inside electric field of barrel more even, prolonged life.

In the solid insulating cylinder, the inner end part of the outgoing conducting rod is a round block-shaped connecting part, and two side surfaces of the connecting part are respectively attached to the top wall of the three inner sides of the shielding net and the end surface of the upper static end of the vacuum switch tube.

The round block-shaped connecting parts enable the outgoing line conducting rod, the shielding net III and the vacuum switch tube to be in a leaning relation, the discharging phenomenon caused by gaps is avoided, the partial discharge value is reduced, and the service life is further prolonged.

In the solid insulating cylinder, a plurality of metal inserts I with internal threads are embedded in the bottom of the cylinder body, a positioning support is arranged at the top of the cylinder body, and a metal insert II with internal threads is embedded in the positioning support.

Through the setting of metal insert one and metal insert two for the upper and lower both ends homoenergetic of solid insulation cylinder is fixed mutually with the help of the cabinet body of fastener and switch solid cabinet, so the solid insulation cylinder just no longer has the unsettled condition of one end, makes its focus more steady, and the stress point is more dispersed, thereby guarantees that transportation and use after the solid insulation cylinder dress cabinet are difficult for damaging or warping, has prolonged life to a certain extent.

Compared with the prior art, the solid insulating cylinder has the following advantages:

1. the shielding net is set as a first shielding net and a second shielding net, and the first shielding net is provided with a pair of shielding sheets which can shield each electric connection part between the vacuum switch tube and the incoming line conducting rod, so that partial discharge is eliminated, the electric field intensity of each electric connection part is reduced, and the insulating property of the solid insulating cylinder in a working state is ensured; the body of the first shielding net has the cross section which is the same as that of the barrel, so that the switch disconnecting link can be coated in the first shielding net after disconnecting the conductive assembly, high-voltage shielding of the switch disconnecting link in a non-working state is realized, and the insulating property of the solid insulating barrel in the non-working state is ensured. No matter in working state or non-working state, the internal electric field can be kept uniform, the insulating property is guaranteed, the service life is longer, and the safety is higher.

Drawings

Fig. 1 is a perspective view of the present solid insulation cylinder.

Fig. 2 is a schematic perspective view of the solid insulation cylinder at another angle.

Fig. 3 is a longitudinal sectional view of the present solid insulation cylinder (not equipped with a switch knife).

Fig. 4 is a transverse cross-sectional view of the present solid insulation cylinder (without switch knife) at the first position of the shielding net.

Fig. 5 is an internal schematic view of the solid insulating cylinder after the switch knife switch is assembled (the switch knife switch is in an operating state).

Fig. 6 is a longitudinal sectional view of fig. 5.

Fig. 7 is an internal longitudinal sectional view of the solid insulating cylinder when the switch knife switch is in a non-working state.

Fig. 8 is a schematic structural diagram of a first shielding net in the solid insulation cylinder.

In the figure, 1, a cylinder; 1a, positioning a support column; 1b, a block-shaped body; 1c, a wire inlet sleeve part; 1d, an outlet sleeve part; 2. leading in a wire conductive rod; 3. a vacuum switching tube; 4. switching a knife switch; 5. a first shielding net; 5a, a body; 5b, a shielding sheet; 5c, connecting sheets; 6. a second shielding net; 6a, a main body; 6a1, abdicating holes; 6b, a substrate; 7. an outgoing line conductive rod; 7a, a connecting part; 8. a shielding net III; 8a, a notch; 9. a first metal insert; 10. a second metal insert; 11. a third metal insert; 12. a tool apron; 13. a flexible connector; 14. a fourth shielding net; 15. a shielding net V; 16. and (4) insulating the pull rod.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 to 3, the solid insulating cylinder includes a cylinder body 1 made of an insulating material, and a conductive component and a shielding net embedded in the cylinder body 1, wherein the conductive component and the shielding net are placed in a mold, and then liquid epoxy resin is poured into the mold, and after cooling, the cylinder body 1 with the conductive component and the shielding net embedded therein is formed. The lower end of the cylinder body 1 is provided with an opening, a plurality of first metal inserts 9 with internal threads are embedded in the bottom of the cylinder body 1, the top of the cylinder body 1 is provided with a positioning support 1a, a second metal insert 10 with internal threads is embedded in the positioning support 1a, and the first metal inserts 9 and the second metal inserts 10 are also directly embedded in the cylinder body 1 during epoxy pouring. Through the arrangement of the first metal insert 9 and the second metal insert 10, the upper end and the lower end of the solid insulating cylinder can be fixed with the help of the fastening piece and the cabinet body of the solid switch cabinet, and the upper end of the cylinder body 1 is not suspended in the air any more, so that the center of gravity of the cylinder body is stable.

As shown in fig. 3-7, the conductive assembly includes an incoming line conductive rod 2 and a vacuum switch tube 3, the inner end of the incoming line conductive rod 2 extends into the top of the inner cavity of the cylinder 1 along the horizontal direction, the vacuum switch tube 3 is arranged along the vertical direction, the movable end of the vacuum switch tube 3 is arranged downwards and extends into the inner cavity of the cylinder 1, and the inner end of the incoming line conductive rod 2 is higher than the movable end of the vacuum switch tube 3. The switch knife switch 4 is arranged in the barrel 1, one end of the switch knife switch 4 is hinged to the barrel 1 and is electrically connected with the moving end of the vacuum switch tube 3, a connecting hole is formed in the middle of the switch knife switch 4, and when the switch knife switch 4 swings around a hinged point with the barrel 1, the other end of the switch knife switch 4 can be in contact with the inner end of the incoming line conducting rod 2 to enable the vacuum switch tube 3 to be conducted with the incoming line conducting rod 2, namely, the conducting component to be conducted. In practical application, an operating mechanism is arranged in the solid switch cabinet, the operating mechanism comprises a movable insulating pull rod 16, and the upper end of the insulating pull rod 16 is connected with a connecting hole in the middle of the switch disconnecting link 4 through a fastening piece, so that the switch disconnecting link 4 can be controlled to swing when the insulating pull rod 16 acts, and the on-off of the conductive component is controlled.

As shown in fig. 3-7, in the present embodiment, the structure of the vacuum switch tube 3 is the same as the prior art, and is not described herein again. Furthermore, the cylinder 1 has a block-shaped body 1b therein, the vacuum switch tube 3 is located in the block-shaped body 1b, and the moving end of the vacuum switch tube 3 extends out of the lower end surface of the block-shaped body 1 b. A third metal insert 11 with internal threads is embedded in the lower end face of the block-shaped body 1b, and a tool holder 12 is fixed on the lower end face of the block-shaped body 1b through the matching of a fastener and the third metal insert 11. The tool apron 12 can be made of metal materials and can conduct electricity, one end of the switch knife switch 4 is hinged to the tool apron 12, the tool apron 12 is electrically connected with the moving end of the vacuum switch tube 3 through a soft connecting piece 13 made of conducting materials, the soft connecting piece 13 can be made of red copper, one end of the soft connecting piece 13 is fixed with the moving end of the vacuum switch tube 3, and the other end of the soft connecting piece 13 is fixed with the tool apron 12 (a fastener for fixing the tool apron 12 on the block-shaped body 1b penetrates through the soft connecting piece 13 at the same time).

As shown in fig. 3-8, the shielding net includes a first shielding net 5, the first shielding net 5 includes a main body 5a with two open ends and having the same cross-sectional shape as the cylinder 1, and a pair of shielding pieces 5b protruding from the upper end of the main body 5a along the working direction of the switch knife switch 4, the two shielding pieces 5b are oppositely disposed, the moving end of the vacuum switch tube 3 is located inside the main body 5a, and the switch knife switch 4 is located inside the main body 5a when the conductive assembly is disconnected. The shielding sheet 5b is triangular and is positioned in the middle of the upper end of the body 5a, the shielding sheet 5b and the body 5a are of an integral structure, and two side faces of the shielding sheet 5b are flush with two side faces of the body 5 a. In this embodiment, the inner side of the body 5a is further integrally and fixedly connected with a connecting sheet 5c, and the three metal inserts 11 are integrally and fixedly connected on the connecting sheet 5 c.

As shown in fig. 5-7, the shielding net further includes a second shielding net 6, the second shielding net 6 covers the inner end of the incoming line conducting rod 2, when the conducting assembly is conducted, the switch knife switch 4 from the connecting hole to the hinge point is located inside the two shielding sheets 5b and the body 5a, and the other end of the switch knife switch 4 is located inside the second shielding net 6. The second shielding net 6 comprises a U-shaped main body 6a and a substrate 6b for sealing one side of the main body 6a, the substrate 6b and the main body 6a are of an integrated structure, the substrate 6b is embedded in the top of the cylinder 1 after the cylinder 1 is molded, and the main body 6a is embedded in the side part of the upper end of the cylinder 1. The main body 6a is provided with a yielding hole 6a1 which has the same shape as the inner end of the incoming conducting rod 2 in a penetrating manner, the inner end of the incoming conducting rod 2 extends into the opening of the main body 6a through the yielding hole 6a1, and the inner end of the incoming conducting rod 2 is fixed with the substrate 6b through a fastener.

Further, as shown in fig. 3, 5, 6 and 7, the conducting assembly further includes a wire-outgoing conducting rod 7, and an inner end of the wire-outgoing conducting rod 7 is fixed to the static end of the vacuum switch tube 3 by a fastener to form conduction. The shielding net further comprises a cap-shaped shielding net III 8, the shielding net III 8 covers the static end of the vacuum switch tube 3, a notch 8a is formed in the side portion of the shielding net III 8, the inner end of the outgoing line conducting rod 7 extends into the inner side of the shielding net III 8 through the notch 8a, and the inner end of the outgoing line conducting rod 7 is fixed with the shielding net III 8 through a fastener. Specifically, the inner end part of the outgoing conductive rod 7 is a connecting part 7a in a round block shape, and two side surfaces of the connecting part 7a are respectively attached to the top wall of the inner side of the third shielding mesh 8 and the end surface of the static end of the vacuum switch tube 3.

As shown in fig. 1 to 7, the upper end side of the barrel 1 is provided with a wire inlet bushing portion 1c, the portion of the wire inlet conducting rod 2 except the inner end is located in the wire inlet bushing portion 1c, the shielding net further includes a shielding net four 14 embedded in the wire inlet bushing portion 1c, and the shielding net four 14 is annular and is disposed around the wire inlet conducting rod 2. The side part of the upper end of the barrel body 1 is further provided with an outlet sleeve part 1d, the end part of the outlet sleeve part 1d extends downwards, the part of the outlet conducting rod 7 except the inner end is positioned in the outlet sleeve part 1d, the shielding net further comprises a shielding net five 15 embedded in the outlet sleeve part 1d, and the shielding net five 15 is annular and is arranged around the outlet conducting rod 7. In this embodiment, the bottom surface of the cylinder 1 is higher than the end of the outlet sleeve part 1d, so as to facilitate the hanging of the CT.

The first shielding net 5, the second shielding net 6, the third shielding net 8, the fourth shielding net 14 and the fifth shielding net 15 can be made of conductive nylon or stainless steel materials. After the cylinder 1 is molded in an epoxy casting mode, zinc spraying treatment is carried out on the surface of the cylinder 1 so that the cylinder can be grounded.

In an initial state, as shown in fig. 7, the incoming line conductive rod 2 and the vacuum switch tube 3 are in a disconnected state (i.e., the conductive assembly is disconnected, and the inside of the vacuum switch tube 3 is also in a disconnected state), and at this time, the moving end of the vacuum switch tube 3 and the switch knife switch 4 are both located inside the body 5a of the shielding net 5. When the conducting component needs to be conducted, the inside of the vacuum switch tube 3 is firstly controlled to be conducted, then the insulating pull rod 16 pushes the switch knife switch 4 to swing upwards around the hinged point of the switch knife switch 4 and the cylinder body 1, and one end of the switch knife switch 4 is contacted with the incoming line conducting rod 2 to form the connection. As shown in fig. 6, after the switch knife-switch 4 conducts the conductive component, the switch knife-switch 4 from the connecting hole to the hinged point of the switch knife-switch 4 and the cylinder 1 is located at the inner side of the two shielding sheets 5b and the body 5a, eliminating the possible point discharge phenomenon at the electric connection position of the movable end of the vacuum switch tube 3 and the switch knife-switch 4, the hinged point of the switch knife-switch 4 and the cylinder 1 and the connecting hole on the switch knife-switch 4, and reducing the electric field intensity at the movable end of the vacuum switch tube 3; the other end of the switch knife switch 4 is positioned at the inner side of the shielding net II 6, so that the point discharge phenomenon at the electric connection part of the switch knife switch 4 and the incoming line conducting rod 2 is eliminated, and the electric field intensity at the inner end of the incoming line conducting rod 2 is reduced by the shielding net II 6; the third shielding net 8 reduces the electric field intensity at the static end of the vacuum switch tube 3 and eliminates the point discharge phenomenon at the electric connection part of the outgoing line conducting rod 7 and the vacuum switch tube 3; the shielding net IV 14 reduces the electric field intensity at the outer end of the incoming line conducting rod 2; the shielding mesh five 15 reduces the electric field strength at the outer end of the outgoing conductor bar 7. Namely, in this state, the first shielding net 5, the second shielding net 6, the third shielding net 8, the fourth shielding net 14 and the fifth shielding net 15 are all in a high-voltage equipotential state, so that high-voltage shielding is realized. When the vacuum switch tube 3 is still conducted, and the switch knife switch 4 is disconnected, because the body 5a of the shielding net I5 has the same cross section shape as the cylinder body 1, the switch knife switch 4 is completely positioned at the inner side of the body 5a, the shielding net II 6 is at a low potential, and the shielding net I5 is at a high potential, high-voltage shielding of the switch knife switch 4 in the state is realized, and the insulating property is ensured.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (7)

1. The solid insulating cylinder comprises a cylinder body (1), a conductive component and a shielding net, wherein the conductive component and the shielding net are embedded in the cylinder body (1), the lower end of the cylinder body (1) is provided with an opening, the conductive component comprises an incoming line conductive rod (2) with the inner end positioned in the inner cavity of the cylinder body (1) and a vacuum switch tube (3) with the movable end positioned in the inner cavity of the cylinder body (1), the inner cavity of the cylinder body (1) is provided with a switch knife switch (4) with one end hinged with the inner cavity of the cylinder body and capable of controlling the conduction or disconnection of the movable end of the vacuum switch tube (3) and the inner end of the incoming line conductive rod (2), the middle part of the switch knife switch (4) is provided with a connecting hole, the solid insulating cylinder is characterized in that the shielding net comprises a shielding net I (5) and a shielding net II (6) covered at the inner end of the incoming line conductive rod (2), the shielding net I (5) comprises a body (5a) with openings at two ends and a pair of shielding, two shielding pieces (5b) are just opposite to each other, the moving end of the vacuum switch tube (3) is located on the inner side of the body (5a), the switch disconnecting link (4) is located on the inner side of the body (5a) when the conductive assembly is disconnected, and the connecting hole is located on the inner side of the two shielding pieces (5b) and the body (5a) and the other end of the switch disconnecting link (4) is located on the inner side of the shielding net II (6) when the conductive assembly is conducted.

2. The solid insulation cylinder of claim 1, wherein the shielding plate (5b) is triangular, the shielding plate (5b) is located at the middle of the upper end of the body (5a), and two side surfaces of the shielding plate (5b) are flush with two side surfaces of the body (5 a).

3. The solid insulation cylinder of claim 2, wherein the shielding plate (5b) is of a unitary construction with the body (5 a).

4. The solid insulation cylinder of claim 1, 2 or 3, wherein the shielding net II (6) comprises a U-shaped main body (6a) and a base plate (6b) which is closed to one side of the main body (6a), the main body (6a) is provided with a yielding hole (6a1) which has the same shape as the inner end of the incoming line conducting rod (2) in a penetrating manner, the inner end of the incoming line conducting rod (2) extends into the opening of the main body (6a) through the yielding hole (6a1), and the inner end of the incoming line conducting rod (2) is fixed to the base plate (6b) through a fastener.

5. The solid insulation cylinder according to claim 1, wherein the conductive assembly further comprises a wire outgoing conductive rod (7), the inner end of the wire outgoing conductive rod (7) is fixed with the static end of the vacuum switch tube (3) through a fastener to form conduction, the shielding net further comprises a cap-shaped shielding net III (8), the shielding net III (8) covers the static end of the vacuum switch tube (3), a notch (8a) is arranged on the side of the shielding net III (8), the inner end of the wire outgoing conductive rod (7) extends into the shielding net III (8) through the notch (8a), and the wire outgoing conductive rod (7) is fixed with the shielding net III (8) through the fastener.

6. The solid insulation cylinder according to claim 5, wherein the inner end of the outgoing conductive rod (7) is a connecting part (7a) in a round block shape, and two side surfaces of the connecting part (7a) are respectively attached to the top wall of the inner side of the third shielding mesh (8) and the end surface of the upper static end of the vacuum switch tube (3).

7. The solid insulation cylinder according to claim 1, wherein a plurality of metal inserts (9) with internal threads are embedded in the bottom of the cylinder body (1), a positioning support (1a) is arranged on the top of the cylinder body (1), and a metal insert (10) with internal threads is embedded in the positioning support (1 a).

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