Main knife switch of isolating switch

Abstract

A main knife switch of an isolating switch relates to the technical field of isolating switches and is used for solving the problem that the existing main knife switch of the isolating switch cannot meet the requirements of sufficient insulation distance and small occupied space at the same time. Which comprises a main knife switch frame, a crank arm support, a crank arm, a pull rod and a conductive tube, the first end of the main knife switch frame is provided with a wiring board, and is characterized by further comprising an elastic flexible connecting piece, the first end of the crank arm is rotatably connected with the main knife switch frame, and the first end of the conductive tube is rotatably provided with a conductive tube base; the conductive tube base is rotatably connected with the second end of the main knife switch frame, the first end of the pull rod is hinged to the second end of the crank arm, the second end of the pull rod is hinged to the first end of the conductive tube, and the second end of the conductive tube is provided with a contact plate which is used for being in contact with a static contact of an isolating switch to realize closing; the first end of the flexible connecting piece is fixedly connected with the main knife switch frame, the second end of the flexible connecting piece is fixedly connected with the conductive tube base, and the wiring board is electrically connected with the conductive tube base through the flexible connecting piece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of disconnectors, in particular to a disconnector main blade. BACKGROUND

[0002] With large-scale construction of extra-high voltage power grid, disconnectors are required to have both sufficient insulation distance and minimal space occupation. For double-column horizontal rotary disconnectors, the electric field distribution of horizontal break is uneven, and the insulation efficiency of air gap is much lower than that of vertical break. In order to meet the insulation requirements of extra-high voltage, the horizontal distance needs to be further increased, which aggravates the contradiction of space occupation. For single-column vertical telescopic disconnectors, although the horizontal occupation is small, the single-column support causes the bending moment of the conductive rod to be concentrated, which is prone to bending deformation during long-term operation, resulting in hidden reduction of insulation distance. Moreover, the insulation rod of the telescopic mechanism needs to bear tensile force and bending moment, which accelerates the insulation aging and sharply increases the maintenance cost. The stroke of vertical telescopic is limited by the structure, and it is difficult to stably realize the ultra-long break distance required by extra-high voltage. SUMMARY

[0003] The purpose of the present application is to provide a disconnector main blade, which solves the problem that the main blade of the existing disconnector cannot simultaneously satisfy sufficient insulation distance and small space occupation.

[0004] The technical scheme adopted by the present application to solve the technical problem is as follows: a disconnector main blade, comprising a main blade frame, a crank arm support, a crank arm, a pull rod and a conductive tube, the first end of the main blade frame is provided with a terminal board, further comprising a flexible soft connecting piece, the first end of the crank arm is rotationally connected with the main blade frame, the first end of the conductive tube is rotationally installed with a conductive tube base, the conductive tube base is rotationally connected with the second end of the main blade frame, the first end of the pull rod is hingedly connected with the second end of the crank arm, the second end of the pull rod is hingedly connected with the first end of the conductive tube, the second end of the conductive tube is provided with a contact plate for contacting the static contact of the disconnector to realize closing; the first end of the soft connecting piece is fixedly connected with the main blade frame, the second end of the soft connecting piece is fixedly connected with the conductive tube base, and the electrical connection between the terminal board and the conductive tube base is realized through the soft connecting piece.

[0005] Further, the main blade frame further comprises an aluminum angle and a conductive base, the aluminum angle is parallelly arranged in two, the first end of the aluminum angle is fixedly connected with the terminal board, and the second end of the aluminum angle is fixedly connected with the conductive base.

[0006] Further, the soft connecting piece comprises a fixed clamp, a guide plate, a steel sheet and an aluminum sheet, the fixed clamp has two, the steel sheet has two, the aluminum sheet is arranged between the two steel sheets, two guide plates are fixedly arranged on the fixed clamp, and the end portions of the aluminum sheet and the steel sheet extend into the two guide plates on the corresponding fixed clamp and are fixedly connected with the guide plates.

[0007] Further, the spring sleeve is provided between the conductive tube base and the main contact frame, the spring sleeve is elongated under the external pulling force and restores to the original state after the external pulling force is removed; the first end of the spring sleeve is hingedly connected with the main contact frame, and the second end of the spring sleeve is hingedly connected with the conductive tube base.

[0008] Further, the spring sleeve comprises a sleeve main body, a spring pressing rod, a spring mounting plate and a first spring, the first end of the sleeve main body is hingedly connected with the main contact frame, the first end of the spring pressing rod is located in the sleeve main body, the second end of the spring pressing rod is hingedly connected with the conductive tube base, the spring mounting plate is fixed on the first end of the spring pressing rod, and the first spring is located between the spring mounting plate and the second end of the sleeve main body.

[0009] Further, the inner side of the first spring is provided with a second spring, the first end of the second spring is in contact with the spring mounting plate, and the second end of the second spring is in contact with the second end of the sleeve main body.

[0010] Further, the inner wall of the conductive tube base is provided with a watchband contact finger, the first end of the conductive tube is provided with a conductive cylinder, the conductive cylinder extends into the inner side of the conductive tube base and is rotationally connected with the conductive tube base, and the conductive cylinder is in contact with the inner wall of the watchband contact finger.

[0011] Further, the toggle lever comprises a first connecting head, a second connecting head and a connecting plate, the first connecting head is fixed on the first end of the connecting plate, the second connecting head is fixed on the second end of the connecting plate, a rotating shaft is fixed on the first connecting head, a toggle lever support is fixed on the main contact frame, and the rotating shaft is rotationally connected with the toggle lever support; the connecting plate is in an inclined state and the first connecting head is lower than the second connecting head.

[0012] Further, the pull rod comprises a fork and a telescopic connecting frame, the first end of the connecting frame is hingedly connected with the second end of the toggle lever, the second end of the connecting frame is fixedly connected with the first end of the fork, and the second end of the fork is hingedly connected with the first end of the conductive tube.

[0013] Further, the connecting frame comprises a U-shaped frame, a screw rod and an adjusting nut, the U-shaped frame is hingedly connected with the second connecting head, the screw rod penetrates through the U-shaped frame and is rotationally connected therebetween, the adjusting nut is fixedly connected with the first end of the fork, and the adjusting nut is threadedly connected with the screw rod.

[0014] Further, the connecting plate comprises a straight plate and a bent plate, the straight plate penetrates through the bent plate and they are vertically arranged.

[0015] Further, the conductive base has a transition support fixedly connected with the support insulator, and the transition support has a grounding static contact.

[0016] The application has the advantages that: the composite rotation of the conductive tube, the conductive tube base and the main switch frame, in cooperation with the linkage of the crank arm and the pull rod, balances the insulation distance and the space occupation; the conductive tube disperses the bending moment through the rotation of the conductive tube base, the crank arm is designed to be inclined and the pull rod is optimized to bear the force, thereby improving the stability; the close contact of the conductive cylinder with the inner wall surface of the conductive tube base and the contact finger ensures the reliability of the dynamic electrical connection when the conductive parts move relatively, and reduces the contact failure; compared with the existing main switch structure, the insulation distance is larger, the space occupation is smaller, the movement is more stable, and the service life is longer. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a three-dimensional view of the main switch frame of the application; Figure 2 is one of the three-dimensional views of the parts on the main switch frame of the application; Figure 3 is the second three-dimensional view of the parts on the main switch frame of the application; Figure 4 is the top view of the parts on the main switch frame of the application; Figure 5 is the front view of the parts on the main switch frame of the application; Figure 6 is the sectional view of the conductive base and the conductive tube base; Figure 7 is the sectional view of the spring sleeve; Figure 8 is Figure 4 is the enlarged view of A in the figure; Figure 9 is the three-dimensional view of the conductive tube; Figure 10 is the three-dimensional space position view of the buffer block and the base lug plate; Figure 11 is the front view of the flexible connecting piece; Figure 12 is the three-dimensional view of the crank arm; Figure 13 is the front view of the crank arm; Figure 14 is the three-dimensional view of the pull rod; In the diagram: 1. Main switch frame; 11. Terminal block; 12. Angle aluminum; 13. Conductive base; 131. Limiting plate; 132. Buffer block; 2. Crank arm bracket; 21. Crank arm support cylinder; 3. Crank arm; 31. Connecting plate; 311. Straight plate; 312. Bending plate; 32. First connector; 33. Second connector; 34. Rotating shaft; 4. Pull rod; 41. Side rod; 42. Connecting block; 43. Connecting frame; 431. U-shaped frame; 432. Screw; 433. Positioning nut; 434. Adjusting nut; 5. Conductive tube; 51. Conductive tube ear plate; 52. Contact plate; 53. Arc-starting ball; 531. Ball seat; 54. First equalizing ring; 55. Contact plate clamp. 551 Slot, 552 Bolt, 56 Conductive Cylinder, 6 Conductive Pipe Base, 61 Base Ear Plate, 62 Skeleton Oil Seal, 63 Rolling Bearing, 64 Watch Strap Finger, 65 Composite Bushing, 7 Spring Sleeve, 71 Sleeve Body, 72 Pressure Plate, 73 Spring Pressure Rod, 74 Spring Mounting Plate, 75 First Spring, 76 Second Spring, 8 Sleeve Mounting Plate, 9 Flange, 10 Second Equalizing Ring, 14 Flexible Connector, 141 Fixing Clip, 142 Steel Sheet, 143 Aluminum Sheet, 144 Guide Plate, 15 Grounding Static Contact, 16 Rod, 17 Transition Bracket, 171 Transition Flange, 172 Transition Plate. Detailed Implementation

[0018] like Figures 1 to 14 As shown, the present invention includes a main switch frame 1, a crank arm bracket 2, a crank arm 3, a pull rod 4, a conductive tube 5, a conductive tube base 6, a spring sleeve 7, a sleeve mounting plate 8, a flexible connector 14, and a grounding stationary contact 15. The structure and working principle of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] like Figure 2 , Figure 5 As shown, the main switch frame 1 includes a terminal block 11, angle aluminum brackets 12, and a conductive base 13. The angle aluminum brackets 12 are two parallel brackets. The terminal block 11 is located between the first ends of the two angle aluminum brackets 12, and the terminal block 11 is fixedly connected to the angle aluminum brackets 12 by bolts. The conductive base 13 is located between the second ends of the two angle aluminum brackets 12, and the conductive base 13 is also fixedly connected to the angle aluminum brackets 12 by bolts. The main switch frame 1 is the basic structure of the main switch, used for installing and supporting other components. The main switch frame 1 is directly installed on the insulator of the disconnecting switch, thereby realizing the assembly of the main switch.

[0020] like Figure 1 , Figure 3 As shown, a transition bracket 17 is fixed to the bottom of the conductive base 13. The transition bracket 17 is used for fixed connection with the insulator of the disconnecting switch. The transition bracket 17 includes a transition flange 171 and a transition plate 172. The first end of the transition plate 172 is fixedly connected to the top of the transition flange 171, and the first end of the transition plate 172 is fixedly connected to the bottom of the conductive base 13. A grounding stationary contact 15 is fixed to the second end of the transition plate 172.

[0021] As Figure 2 shown, between the first ends of the two angle aluminum 12, there are also the up and down arranged elbow bracket 2 and sleeve mounting plate 8, the elbow bracket 2 is rectangular as a whole, the first end of the elbow bracket 2 is overlapped on the top surface of the first angle aluminum 12, the second end of the elbow bracket 2 is overlapped on the top surface of the second angle aluminum 12, and the elbow bracket 2 is fixedly connected with the angle aluminum 12 through bolts. The elbow bracket 2 is essentially a metal plate, the top of the elbow bracket 2 is fixed with a cylindrical elbow support cylinder 21, the elbow support cylinder 21 is arranged vertically with the elbow bracket 2, and a reinforcing rib is welded between the side wall of the elbow support cylinder 21 and the top surface of the elbow bracket 2 to ensure the stability of the connection between the elbow bracket 2 and the elbow support cylinder 21. The function of the elbow bracket 2 is to assemble the elbow 3.

[0022] As Figure 2 shown, the sleeve mounting plate 8 is in the shape of "]", and is located between the two angle aluminum 12 and is fixedly connected with the angle aluminum 12 through bolts. The sleeve mounting plate 8 is arranged to enhance the stability of the connection between the two angle aluminum 12, to assist the support of the elbow 3, and to install the spring sleeve 7.

[0023] As Figure 2 , Figure 12 and Figure 13 shown, the elbow 3 includes a connecting plate 31, a first connecting head 32, a second connecting head 33 and a rotating shaft 34, the first connecting head 32 and the second connecting head 33 are fixedly connected through the connecting plate 31, so that the whole elbow 3 forms an integral whole. The connecting plate 31 includes a straight plate 311 and a bent plate 312, the straight plate 311 penetrates through the bent plate 312 and they are arranged vertically. The first end of the straight plate 311 and the bent plate 312 is fixedly connected with the first connecting head 32, and the second end of the straight plate 311 and the bent plate 312 is fixedly connected with the second connecting head 33. The arrangement of the straight plate 311 is equivalent to adding a reinforcing rib between the bent plate 312 and the first connecting head 32 and between the bent plate 312 and the second connecting head 33. The structure of the whole connecting plate 31 greatly increases the strength of bearing torque. In use, the two connecting heads are arranged one above the other, and the first connecting head 32 is lower and the second connecting head 33 is higher, so that the connecting plate 31 is in an inclined state. The bottom of the first connecting head 32 is fixed with the rotating shaft 34, the upper end of the rotating shaft 34 extends into the elbow support cylinder 21, and the rotating shaft 34 is rotatably connected with the elbow support cylinder 21, thereby realizing the rotatable connection between the whole elbow 3 and the elbow bracket 2. The lower end of the rotating shaft 34 extends downward after penetrating through the elbow bracket 2 and the sleeve mounting plate 8 from top to bottom, as Figure 1 and Figure 3As shown, the lower end of the rotating shaft 34 is fixed with a flange 9, which is used to connect with the drive insulator or operating mechanism output shaft of the disconnecting switch. The rotating movement of the drive insulator or operating mechanism output shaft is transmitted to the rotating shaft 34 through the flange 9, so that the crank arm 3 rotates.

[0024] As shown in Figure 1 , Figure 9 , the conductive tube 5 is a circular tube structure. The first end of the conductive tube 5 is welded with a conductive cylinder 56, which is coaxially arranged with the conductive tube 5 and has a smaller diameter than the conductive tube 5. A part of the conductive cylinder 56 extends into the conductive tube 5, and the remaining part of the conductive cylinder 56 is used to assemble with the conductive tube base 6. The outer wall of the first end of the conductive tube 5 has a conductive tube lug plate 51. The second end of the conductive tube 5 is fixed with a first voltage equalizing ring 54 and a contact plate clamp 55. The first voltage equalizing ring 54 is used to prevent the occurrence of discharge phenomenon. The contact plate clamp 55 is a cylindrical structure. The first end of the contact plate clamp 55 extends into the conductive tube 5 and is welded and fixed with the conductive tube 5. The second end of the contact plate clamp 55 has a slot 551, in which a contact plate 52 is inserted. The width of the contact plate 52 is greater than the diameter of the contact plate clamp 55, and the two ends of the contact plate 52 in the width direction extend out of the slot 551. A bolt 552 is arranged on the contact plate clamp 55, which penetrates the contact plate 52, and the contact plate 52 and the contact plate clamp 55 are fixedly connected together through the bolt 552. An arc striking ball 53 is arranged at the second end of the conductive tube 5. The arc striking ball 53 has a T-shaped ball seat 531. The ball seat 531 is essentially a combination of a metal plate and a metal rod, which are arranged vertically and fixedly connected. The metal plate part of the ball seat 531 is fixedly connected with the second end of the conductive tube 5 through a bolt, and the metal rod part of the ball seat 531 is fixedly connected with the arc striking ball 53, so that the arc striking ball 53 is indirectly in contact with the contact plate 52. The contact plate 52 is used to contact the contact finger on the disconnecting switch, thereby realizing closing. The first end of the conductive tube 5 is fixed with the conductive tube lug plate 51, which is hingedly connected with the pull rod 4, thereby realizing the assembly of the conductive tube 5 and the pull rod 4.

[0025] As shown in Figure 2 and Figure 4 , the pull rod 4 includes a fork and a connecting frame 43. As shown in Figure 14 , the fork includes side rods 41 and connecting blocks 42. The side rods 41 are symmetrically arranged in two. The connecting blocks 42 are arranged between the two side rods 41. The connecting blocks 42 are sequentially arranged and gradually increase in length along the arrangement direction. The end of the connecting block 42 is welded and fixed with the corresponding side rod 41, so that the whole fork is tapered. The large end of the fork is hingedly connected with the conductive tube lug plate 51. Figure 4 , Figure 8As shown, the lower end of the fork is used to install the connecting frame 43, which includes a U-shaped frame 431, a screw rod 432, a positioning nut 433 and an adjusting nut 434. The second connecting head 33 of the toggle arm 3 extends into the U-shaped frame 431 and is hingedly connected therebetween. The screw rod 432 is rotatably connected to the U-shaped frame 431 at the first end thereof provided with a nut. To limit the screw rod 432, the positioning nut 433 is arranged at the first end of the screw rod 432. The middle part of the U-shaped frame 431 is clamped between the positioning nut 433 and the nut of the screw rod 432. The second end of the screw rod 432 is threadedly fitted with the adjusting nut 434. As shown, Figure 14 The adjusting nut 434 is located between the two side rods 41 and at the small end of the fork, and is welded and fixed with the side rods 41. When the screw rod 432 is rotated, the relative position of the screw rod 432 and the adjusting nut 434 can be adjusted, and thus the distance between the U-shaped frame 431 and the fork can be adjusted. The connecting frame 43 is used to adjust the distance between the pull rod 4 and the second connecting head 33 of the toggle arm 3 to meet the assembly requirements. When the toggle arm 3 rotates in the horizontal plane, the conductive tube 5 is pushed and pulled by the pull rod 4, so that the conductive tube 5 rotates relative to the conductive base 13. When the toggle arm 3 rotates clockwise, the conductive tube 5 is pushed down by the pull rod 4; when the toggle arm 3 rotates counterclockwise, the conductive tube 5 is pulled up by the pull rod 4.

[0026] As shown, Figure 6 The conductive tube base 6 is a cylindrical structure, and the inner part of both ends of the conductive tube base 6 is provided with a skeleton oil seal 62. The inner part of the first end of the conductive tube base 6 is provided with a rolling bearing 63, and the bearing outer ring of the rolling bearing 63 is fixedly connected with the inner wall of the conductive tube base 6. The inner part of the second end of the conductive tube base 6 is provided with a watchband contact finger 64 and a composite shaft sleeve 65. The watchband contact finger 64 has two, and is rotatably connected with the inner wall of the conductive tube base 6. The composite shaft sleeve 65 is also rotatably connected with the inner wall of the conductive tube base 6, and is located between the watchband contact finger 64 and the skeleton oil seal 62 of the second end of the conductive tube base 6. The conductive cylinder 56 of the first end of the conductive tube 5 extends into the conductive tube base 6, and is fixedly connected with the inner ring of the rolling bearing 63. The outer wall of the conductive cylinder 56 is in contact with the watchband contact finger 64. In turn, the conductive cylinder 56 is electrically connected with the conductive tube base 6 through the watchband contact finger 64, and is rotatably connected with the conductive tube 5 through the rolling bearing 63. The outer wall of the conductive tube base 6 is provided with a base lug 61, which is rotatably connected with the conductive base 13 through a hinge shaft 66. The conductive tube 5 is rotatably connected with the conductive tube base 6, and the conductive tube base 6 is rotatably connected with the conductive base 13, so that the conductive tube 5 can rotate around its own axis and swing relative to the conductive base 13.

[0027] To realize the electrical connection between the terminal block 11 and the conductive tube 5, as shown, Figure 4As shown in the drawings, a soft connecting piece 14 is arranged between the main blade frame 1 and the conductive tube 5, the first end of the soft connecting piece 14 is fixedly connected with the corner aluminum 12 through a bolt, the second end of the soft connecting piece 14 is fixedly connected with the first end of the conductive tube base 6 through a bolt, and the soft connecting piece 14 has elasticity and flexibility. The terminal block 11 is fixedly contacted with the corner aluminum 12, the corner aluminum 12 is fixedly contacted with the soft connecting piece 14, the soft connecting piece 14 is fixedly contacted with the conductive tube base 6, the conductive tube base 6 is electrically connected with the conductive tube 5, and then the electrical connection between the conductive tube 5 and the terminal block 11 is realized. The soft connecting piece 14 has two, and the two soft connecting pieces 14 are symmetrically arranged. Specifically, as shown in the drawings, Figure 11 As shown in the drawings, the soft connecting piece 14 includes a fixed card 141, a steel sheet 142 and an aluminum sheet 143, the fixed card 141 has two, the guide plates 144 are welded and fixed on the fixed card 141, each fixed card 141 has two guide plates 144, and the guide plates 144 are symmetrically arranged on the fixed card 141, the steel sheet 142 has two, the aluminum sheet 143 has a plurality of, the plurality of aluminum sheets 143 are located between the two steel sheets 142, the end of the steel sheet 142 and the aluminum sheet 143 extends into the two guide plates 144 on the corresponding side fixed card 141, and is welded and fixed with the guide plate 144, so that the whole soft connecting piece 14 becomes an integral whole and has elasticity and flexibility. The fixed card 141 at the first end of the soft connecting piece 14 is fixedly connected with the corner aluminum 12 through a bolt, and the fixed card 141 at the second end of the soft connecting piece 14 is fixedly connected with the conductive tube base 6 through a bolt. The corner aluminum 12 is fixed, the conductive tube base 6 rotates relative to the conductive base 13, the distance between the conductive tube base 6 and the corner aluminum 12 changes, and the structure of the soft connecting piece 14 can adapt to the change.

[0028] When the conductive tube base 6 rotates relative to the conductive base 13, in order to limit the conductive tube base 6, as shown in the drawings, Figure 3 As shown in the drawings, a limiting plate 131 is fixed on the upper part of the conductive base 13, two buffer blocks 132 are symmetrically arranged on the limiting plate 131, and the buffer block 132 is a rubber piece. As shown in the drawings, Figure 10 As shown in the drawings, the base ear plate 61 has two side edges, and the two side edges correspond to the two buffer blocks 132 one by one. During the rotation of the conductive tube base 6 relative to the conductive base 13, when the buffer block 132 contacts the side edge corresponding to the base ear plate 61, the rotation of the conductive tube base 6 is limited, that is, the rotation amplitude of the conductive tube base 6 is limited.

[0029] In order to ensure the smoothness of the conductive tube 5 falling, a spring sleeve 7 is arranged between the conductive tube base 5 and the sleeve mounting plate 8. As shown in the drawings, Figure 7As shown, the spring sleeve 7 includes a sleeve body 71, a pressure plate 72, a spring rod 73, a first spring 75, and a second spring 76. The sleeve body 71 has a cylindrical structure, and pressure plates 72 are fixed inside both ends of the sleeve body 71. The pressure plate 72 at the first end of the sleeve body 71 has an ear plate, and the pressure plate 72 at the second end of the sleeve body 71 has a through hole. The first end of the spring rod 73 has a spring mounting plate 74 located inside the sleeve body 71. The second end of the spring rod 73 extends out of the sleeve body 71. The first spring 75 and the second spring 76 are positioned between the spring mounting plate 74 and the pressure plate 72 at the second end of the sleeve body 71. The first spring 75 and the second spring 76 are positioned inside and outside each other, and in their natural state, they have the same length. The second spring 76 is located inside the first spring 75. Under the action of the first spring 75 and the second spring 76, the spring rod 73 extends to its maximum length inside the sleeve body 71. Under the coordinated action of the first spring 75 and the second spring 76, the spring rod 73 smoothly moves out of the sleeve body 71. The nested arrangement of the second spring 76 and the first spring 75 strengthens the elastic force. When the crank arm 3 rotates in the opposite direction, causing the conductive tube 5 to rise, the first spring 75 and the second spring 76 exert a strong pulling force on the spring mounting plate 74, making the rising process of the conductive tube 5 relatively smooth. The function of the spring sleeve 7 is to provide tension and elasticity for the rising process of the conductive tube 5, ensuring the smoothness of the rising process of the conductive tube 5.

[0030] Two symmetrically arranged second equalizing rings 10 are provided around the periphery of the main switch frame 1. The second equalizing rings 10 are designed to prevent discharge. The entire main switch frame 1 is located between the two second equalizing rings 10. Figure 3 As shown, the second equalizing ring 10 is fixedly connected to the angle aluminum 12 via the rod 16.

[0031] The working principle of this invention is described below: (1) Installation: During installation, the flange 9 is fixedly connected to the output shaft or operating insulator of the operating mechanism of the disconnector, and the transition flange 171 of the transition bracket 17 is fixedly connected to the support insulator of the disconnector.

[0032] (2) Closing: Before closing, the conductive tube 5 is in a vertical position; when closing, the flange 9 is rotated clockwise by the output shaft of the operating mechanism or the operating insulator. At this time, the crank arm 3 rotates clockwise, and the conductive tube 5 is pushed downward by the pull rod 4, i.e., it falls; until the contact plate 52 on the conductive tube 5 extends into the stationary contact of the disconnecting switch and contacts the contact finger to achieve closing. At the same time, the relative position and angle between the conductive tube base 6 and the angle aluminum 12 change, and the flexible connector 14 adapts to the swinging needs of the conductive tube base 6 by telescoping and deforming. During the rotation of the conductive tube base 6, the spring pull rod 73 in the spring sleeve 7 swings with the conductive tube base 6 and moves outward relative to the sleeve body 71, so that the conductive tube 5 falls smoothly.

[0033] (3) Opening: When opening, the flange 9 is rotated counterclockwise by the output shaft of the operating mechanism or the operating insulator, at this time the crank arm 3 rotates counterclockwise, and the conducting tube 5 is pulled upward by the pull rod 4, that is, it rises; At this time, the contact plate 52 on the conducting tube 5 gradually separates from the contact finger in the static contact of the disconnecting switch, until the conducting tube returns to the vertical state. At the same time, the relative position and angle of the conducting tube base 6 and the angle aluminum 12 change, and the soft connecting piece 14 deforms to adapt to the swing needs of the conducting tube base 6. During the rotation of the conducting tube base 6, the spring pull rod 73 in the spring sleeve 7 swings with the conducting tube base 6 and moves inward relative to the sleeve body 71, so that the conducting tube 5 rises smoothly.

[0034] The advantages of the disconnecting switch main knife of the application are: through the composite rotation of the conducting tube 5, the conducting tube base 6 and the main knife frame 1, cooperating with the linkage of the crank arm 3 and the pull rod 4, the insulation distance and the space occupation are balanced; The double-spring design of the spring sleeve 7 provides buffer for the swing of the conducting tube 5, the conducting tube 5 disperses the bending moment through the rotation of the conducting tube base 6, the oblique design of the crank arm 3 and the optimized stress of the pull rod 4 improve the stability; The close contact of the conducting cylinder 56 and the contact finger 64 on the inner wall of the conducting tube base 6 ensures the reliability of the dynamic electrical connection when the conducting parts move relatively, reduces the contact failure; Compared with the existing main knife structure, the insulation distance is larger, the space occupation is smaller, the movement is more stable, and the service life is longer.

Claims

1. A disconnector main switch, comprising a main switch frame, a crank arm bracket, a crank arm, a pull rod, and a conductive tube, wherein the first end of the main switch frame has a terminal block, characterized in that, It also includes a flexible flexible connector. The first end of the crank arm is rotatably connected to the main switch frame. The first end of the conductive tube is rotatably mounted with a conductive tube base. The conductive tube base is rotatably connected to the second end of the main switch frame. The first end of the pull rod is hinged to the second end of the crank arm. The second end of the pull rod is hinged to the first end of the conductive tube. The second end of the conductive tube has a contact plate for contacting the stationary contact of the disconnecting switch to achieve closing. The first end of the flexible connector is fixedly connected to the main switch frame. The second end of the flexible connector is fixedly connected to the conductive tube base. The electrical connection between the terminal block and the conductive tube base is achieved through the flexible connector.

2. The main disconnector switch according to claim 1, characterized in that, The main switch frame also includes angle aluminum and conductive base. The angle aluminum consists of two parallel pieces. The first end of the angle aluminum is fixedly connected to the terminal block, and the second end of the angle aluminum is fixedly connected to the conductive base.

3. The main disconnector switch according to claim 1, characterized in that, The flexible connector includes a fixing clip, a guide plate, a steel sheet, and an aluminum sheet. There are two fixing clips, two steel sheets, and several aluminum sheets disposed between the two steel sheets. Two guide plates are fixed on the fixing clip. The ends of the aluminum sheets and steel sheets extend into the space between the two guide plates on the corresponding side fixing clip and are fixedly connected to the guide plates.

4. The main disconnector switch according to claim 1, characterized in that, A spring sleeve is provided between the conductive tube base and the main switch frame. The spring sleeve extends under external tension and returns to its original shape after the external tension is removed. The first end of the spring sleeve is hinged to the main switch frame, and the second end of the spring sleeve is hinged to the conductive tube base.

5. The main disconnector switch according to claim 4, characterized in that, The spring sleeve includes a sleeve body, a spring rod, a spring mounting plate, and a first spring. The first end of the sleeve body is hinged to the main gate frame. The first end of the spring rod is located inside the sleeve body. The second end of the spring rod is hinged to the conductive tube base. The spring mounting plate is fixed to the first end of the spring rod. The first spring is located between the spring mounting plate and the second end of the sleeve body.

6. The main disconnector switch according to claim 5, characterized in that, The first spring has a second spring on its inner side, the first end of the second spring is in contact with the spring mounting plate, and the second end of the second spring is in contact with the second end of the sleeve body.

7. The main disconnector switch according to claim 1, characterized in that, The inner wall of the conductive tube base has watch strap fingers, and the first end of the conductive tube has a conductive cylinder. The conductive cylinder extends into the inner side of the conductive tube base and is rotatably connected to the conductive tube base, and the conductive cylinder is in contact with the inner wall of the watch strap fingers.

8. The main disconnector switch according to claim 1, characterized in that, The crank arm includes a first connector, a second connector, and a connecting plate. The first connector is fixed to the first end of the connecting plate, and the second connector is fixed to the second end of the connecting plate. A rotating shaft is fixed to the first connector. A crank arm bracket is fixed to the main switch frame. The rotating shaft is rotatably connected to the crank arm bracket. The connecting plate is inclined and the first connector is lower than the second connector.

9. The main disconnector switch according to claim 1, characterized in that, The pull rod includes a fork and a telescopic connecting frame. The first end of the connecting frame is hinged to the second end of the crank arm, the second end of the connecting frame is fixedly connected to the first end of the fork, and the second end of the fork is hinged to the first end of the conductive tube.

10. The main disconnector switch according to claim 9, characterized in that, The connecting frame includes a U-shaped frame, a screw, and an adjusting nut. The U-shaped frame is hinged to the second connecting head. The screw passes through the U-shaped frame and is rotatably connected to it. The adjusting nut is fixedly connected to the first end of the fork and is threadedly connected to the screw.

11. The main disconnector switch according to claim 1, characterized in that, The connecting plate includes a straight plate and a bent plate, wherein the straight plate passes through the bent plate and the two are arranged perpendicularly.

12. The main disconnector switch according to claim 1, characterized in that, The conductive base has a transition bracket, which is fixedly connected to the supporting insulator, and the transition bracket has a grounding stationary contact.

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