Optimized main disconnecting blade structure of single-column double-arm vertical telescopic disconnecting switch

Abstract

The application provides an optimized main disconnecting knife structure of a single-column double-arm vertical telescopic disconnecting switch, and relates to the technical field of high-voltage power equipment. The main disconnecting knife structure comprises a transmission box, a lower conducting pipe, a movable joint, an upper conducting pipe and a transmission mechanism. In order to solve the problems of poor protection of the transmission box, easy erosion of the internal components by the environment and easy loosening of the connection between the conducting pipe and the movable joint, which leads to heating and burning, the technical scheme of the application is that the transmission box is a closed structure for isolating the transmission mechanism from the external environment; and the lower conducting pipe and the movable joint and the upper conducting pipe and the movable joint are fixedly connected through a welding structure. Through the closed transmission box and the welding connection structure, the application effectively improves the reliability of the operation of the disconnecting switch and the long-term stability of the electrical connection, avoids the risk of jamming of the transmission mechanism and overheating and burning of the connection point, and improves the safety of the operation of the equipment.

Description

Technical Field

[0001] This invention relates to the field of high-voltage power equipment technology, and in particular to an optimized main switch structure for a single-column double-arm vertical telescopic disconnector. Background Technology

[0002] Disconnecting switches are critical equipment in power systems used to isolate circuits and ensure the safety of maintenance personnel. Among them, the single-column double-arm vertical telescopic disconnecting switch is widely used due to its structural characteristics.

[0003] However, the existing main switch structure of this type of disconnector has revealed several defects during long-term operation: First, its core transmission mechanism is usually installed in a transmission box, but these transmission boxes are mostly open or semi-open structures with poor protection. In outdoor environments, rain, snow, dust, etc., can easily penetrate the interior of the box and corrode the transmission components; at the same time, it cannot effectively prevent birds and small animals from nesting inside, which may cause the transmission linkage to be jammed by foreign objects, affecting the reliability of the disconnector's opening and closing operations. Second, in the existing structure, the connection between the upper and lower conductive tubes and the movable joint of the conductive arm generally adopts mechanical fastening methods such as "cone-shaped structure". This non-permanent connection method is prone to loosening, displacement, or jamming under the repeated effects of electrodynamics, wind load, vibration, and thermal expansion and contraction over a long period of time. Once the connection becomes loose, a gap will be generated between the contact surfaces of the moving and stationary contacts, the contact resistance will increase sharply, and severe heat will be generated when a large current passes through, even burning out the moving and stationary contacts, posing a serious safety hazard and threatening the stable operation of the power grid. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the defects in the existing technology of poor protection of the transmission box of the disconnecting switch, the susceptibility of internal components to environmental corrosion, and the risk of loosening and jamming of the tapered connection structure used for the conductive tube and the movable joint, which can easily lead to poor contact and overheating. The present invention provides an optimized main switch structure for a single-column double-arm vertical telescopic disconnecting switch with optimized structure and more reliable operation.

[0005] To solve the above technical problems, the present invention provides an optimized main switch structure for a single-column double-arm vertical telescopic disconnector, including a transmission box, a lower conductive tube, a movable joint, an upper conductive tube, a movable contact disposed on the upper part of the upper conductive tube, and a transmission mechanism disposed in the transmission box, wherein the transmission mechanism drives the upper conductive tube with the movable contact to achieve telescopic movement;

[0006] The transmission box is a closed structure used to isolate the transmission mechanism from the external environment;

[0007] The lower conductive tube and the movable joint, or the upper conductive tube and the movable joint, are fixedly connected by a welding structure.

[0008] Preferably, the transmission mechanism is a four-bar linkage.

[0009] Preferably, the four-bar linkage is provided with a crank arm. One end of the crank arm is connected to an external transmission mechanism, and the other end is connected to one end of the elastic rod assembly through a spherical bearing. The other end of the elastic rod assembly is connected to one end of the crank arm I through a joint I and a shaft pin I. The crank arm I passes through the horizontal shaft I in the middle and drives it to rotate.

[0010] One end of the crank arm II passes through the horizontal shaft I. The horizontal shaft I rotates, thereby driving the crank arm II to move. The other end of the crank arm II is connected to one end of the pull rod through the axle pin II and the connector II. The other end of the pull rod is connected to the crank arm III through the connector III and the axle pin III. The rotation of the crank arm III drives the other horizontal shaft II to rotate.

[0011] The ends of horizontal shaft I and horizontal shaft II are exposed in the transmission box and are equipped with a transmission mechanism connected to the lower conductive tube.

[0012] Preferably, in the transmission mechanism, clamp I is fixed to horizontal shaft I or horizontal shaft II by a lifting pin, pipe clamp is fixed to clamp I by bolts, and clamp II is fixed to the lower conductive pipe by bolts.

[0013] Preferably, the transmission box is equipped with a balance spring for balancing the weight of the lower conductive tube, the upper conductive tube, and the movable joint.

[0014] Preferably, the lower conductive tube and the movable joint, as well as the upper conductive tube and the movable joint, are fixedly connected by a welded structure.

[0015] Preferably, the upper conductive tube includes two sets, left and right. The two sets of upper conductive tubes are bent at their intersection and then pivotally connected by a pivot pin. The movable joint is connected at the intersection of the two sets of lower conductive tubes and the upper conductive tubes.

[0016] Preferably, the upper conductive tube includes two sets, left and right, which are respectively connected to the two branches of a Y-shaped connector, and the rod of the Y-shaped connector is fixedly connected to the lower conductive tube.

[0017] Preferably, the moving contact is fixed to the end of the upper conductive tube by a rivet.

[0018] The technical solution provided by this invention has the following beneficial effects:

[0019] 1. By adopting a closed structure for the transmission box design, the transmission mechanism can be effectively isolated from external environments such as rain, snow, and dust, and prevent birds and other animals from entering and nesting, thereby avoiding corrosion or jamming of transmission components, ensuring smooth and accurate opening and closing operations of the disconnecting switch, enhancing the environmental adaptability of the equipment and extending its service life.

[0020] 2. By using a welded structure to fix the lower conductive tube to the movable joint and the upper conductive tube to the movable joint, a permanent electrical and mechanical connection is formed. This fundamentally solves the problem that the existing tapered structure is prone to loosening due to vibration, thermal expansion and contraction, etc. It effectively avoids serious faults such as overheating and burning caused by increased contact resistance due to loose connection, ensures the long-term stability of electrical connection, greatly improves the operational safety of equipment and power grid, significantly extends the equipment maintenance cycle, and reduces operation and maintenance costs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the main switch of the present invention in the open state.

[0024] Figure 3 This is a top view of the main switch of the present invention in the open state.

[0025] Figure 4 This is a schematic diagram of the closing motion principle of the main switch of the present invention.

[0026] Figure 5 This is a schematic diagram of the four-bar linkage mechanism of the present invention in the open position.

[0027] Figure 6 This is a schematic diagram of the four-bar linkage mechanism of the present invention in the closed position.

[0028] Figure 7 This is a schematic diagram of the internal structure of the transmission box of the present invention.

[0029] Figure 8 This is a schematic diagram of the structure at the connection between the upper and lower conductive tubes of the present invention.

[0030] In the diagram: 1. Transmission box; 1-1. Crank arm; 1-2. Spherical bearing; 1-3. Elastic rod assembly; 1-4. Joint I; 1-5. Pin I; 1-6. Horizontal shaft I; 1-7. Crank arm I; 1-8. Crank arm II; 1-9. Pin II; 1-10. Joint II; 1-11. Tie rod; 1-12. Joint III; 1-13. Pin III; 1-14. Crank arm III; 1-15. Horizontal shaft II; 1-16. Expansion pin; 1-17. Clamping plate I ; 1-18, Pipe clamp; 1-19, Clamp plate II; 1-20, Balance spring; 2, Lower conductive tube; 3, Movable joint; 4, Upper conductive tube; 5, Moving contact; 6, Stationary contact; 7, Fittings; 8, Operating insulator; 9, Supporting insulator; 10, Base; 11, Foundation support; 12, Vertical connecting rod; 13, Operating mechanism; 14, Conductive tube connection structure; 14-1, Shaft pin IV; 14-2, Bolt; 14-3, Support tube; 14-4, Cotter pin. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be considered as limitations on this application. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by those skilled in the art. The terminology used in the embodiments of this application is for the purpose of describing the embodiments of this application only and is not intended to limit this application.

[0032] Before providing a further detailed description of the embodiments of this application, some of the nouns and terms involved in the embodiments of this application will be explained. The nouns and terms involved in the embodiments of this application are subject to the following interpretations.

[0033] An optimized main switch structure for a single-column, double-arm, vertically telescopic disconnector includes a transmission box (1), a lower conductive tube (2), a movable joint (3), an upper conductive tube (4), a moving contact 5 disposed on the upper part of the upper conductive tube (4), and a transmission mechanism disposed within the transmission box (1). The transmission mechanism drives the upper conductive tube (4) with the moving contact 5 to achieve telescopic movement. The moving contact 5 is fixed to the end of the upper conductive tube (4) by rivets or bolts. The lower part of the above main switch structure has the original structure, which, from top to bottom, consists of an operating insulator 8, a supporting insulator 9, a base 10, a foundation support 11, a vertical connecting rod 12, and an operating mechanism 13.

[0034] The transmission box 1 is a closed structure used to isolate the transmission mechanism from the external environment. The transmission mechanism is a four-bar linkage. The four-bar linkage includes a crank arm 1-1. One end of the crank arm 1-1 is connected to an external transmission mechanism, and the other end is connected to one end of an elastic rod assembly 1-3 via a spherical bearing 1-2. The other end of the elastic rod assembly 1-3 is connected to one end of a crank arm I1-7 via a connector I1-4 and a shaft pin I1-5. The middle of the crank arm I1-7 passes through a horizontal shaft I1-6 and drives it to rotate. One end of the crank arm II1-8 passes through the horizontal shaft I1-6. The rotation of the horizontal shaft I1-6 drives the movement of the crank arm II1-8. The other end of the crank arm II1-8 is connected to one end of a pull rod 1-11 via a shaft pin II1-9 and a connector II1-10. The other end of the pull rod 1-11 is connected to a crank arm III1-14 via a connector III1-12 and a shaft pin III1-13. The rotation of the crank arm III1-14 drives the rotation of another horizontal shaft II1-15. The ends of the horizontal shafts I1-6 and II1-15 are exposed in the transmission box 1 and are equipped with a transmission mechanism connected to the lower conductive pipe 2. Preferably, in the transmission mechanism, clamp I1-17 is fixed to horizontal shaft I1-6 or horizontal shaft II1-15 by expansion pin 1-16, pipe clamp 1-18 is fixed to clamp I1-17 by bolts, and clamp II1-19 is fixedly connected to pipe clamp 1-18 to the lower conductive pipe 2 by bolts. The transmission box 1 is equipped with a balance spring 1-20 to balance the weight of the lower conductive pipe 2, upper conductive pipe 4, and movable joint 3. The balance spring counteracts the closing torque generated by the weight of the main switch. During the opening process, the spring stretches and stores energy; during the closing process, the spring recovers and releases energy, making the opening and closing processes easy and smooth.

[0035] When crank arm 1-1 rotates clockwise, it pushes the elastic rod assembly 1-3, connected by the spherical bearing 1-2, to rotate. The rotation of elastic rod assembly 1-3 pushes the crank arm I1-7, connected by the connector I1-4 and the shaft pin I1-5, to rotate. The rotation of crank arm I1-7 drives the left horizontal shaft I1-6 to rotate. The rotation of horizontal shaft I1-6 drives the crank arm II1-8 to rotate. The rotation of crank arm II1-8 pushes the pull rod 1-11, connected by the shaft pin II1-9 and the connector II1-10, to move. The movement of pull rod 1-11 pushes the other end of the pull rod, connected by the connector III1-1... 2. The crank arm III1-14, connected to the pivot pin III1-13, rotates, causing the right shaft II1-15 to rotate. The clamp plate I1-17 is fixed to the horizontal shaft via the expansion pin 1-16. The pipe clamp 1-18 is fixed to the clamp plate I1-17 with bolts. The clamp plate II1-19 and the pipe clamp 1-18 are fixed to the lower conductive pipe with bolts. The rotation of the two horizontal shafts I1-6 and II1-15 drives the lower conductive pipes fixed thereto. The pull rod 1-11 ensures the synchronization of the closing process of the left and right conductive pipes, thus completing the closing process.

[0036] A welded structure is used for fixed connection between the lower conductive tube 2 and the movable joint 3, or between the upper conductive tube 4 and the movable joint 3. Preferably, both the lower conductive tube 2 and the movable joint 3, and the upper conductive tube 4 and the movable joint 3, are fixedly connected by welded structures. A conductive tube connection structure 14 is provided at the movable joint 3. When the lower conductive tube rotates upward, it pushes the upper conductive tube, which is connected to it by the shaft pin IV14-1 and bolt 14-2, to rotate upward. The upper conductive tubes on both sides are connected and fixed by the shaft pin IV14-1 and cotter pin 14-4, thereby completing the closing process. The opening process is the reverse.

[0037] The upper conductive tube 4 comprises two sets, left and right. The two sets of upper conductive tubes are bent at their intersection and then pivotally connected by a pivot pin. The movable joint 3 is connected to the intersection of the two sets of lower conductive tubes 2 and the upper conductive tubes 4. The two sets of upper conductive tubes 4 are respectively connected to the two branches of a Y-shaped connector, and the rod of the Y-shaped connector is fixedly connected to the lower conductive tube 2. A support tube 14-3 is provided between the two sets of conductive tubes.

Claims

1. An optimized main switch structure for a single-column double-arm vertical telescopic disconnector, comprising a transmission box (1), a lower conductive tube (2), a movable joint (3), an upper conductive tube (4), a moving contact (5) disposed on the upper part of the upper conductive tube (4), and a transmission mechanism disposed within the transmission box (1), wherein the transmission mechanism drives the upper conductive tube (4) with the moving contact (5) to achieve telescopic movement, characterized in that: The transmission box (1) is a closed structure used to isolate the transmission mechanism from the external environment; The lower conductive tube (2) and the movable joint (3) are fixedly connected by a welding structure, as are the upper conductive tube (4) and the movable joint (3).

2. The optimized main switch structure of a single-column double-arm vertical telescopic disconnector according to claim 1, characterized in that, The transmission mechanism is a four-bar linkage.

3. The optimized main switch structure of a single-column double-arm vertical telescopic disconnector according to claim 2, characterized in that, The four-bar linkage is equipped with a crank arm (1-1). One end of the crank arm (1-1) is connected to an external transmission mechanism, and the other end is connected to one end of the elastic rod assembly (1-3) through a joint bearing (1-2). The other end of the elastic rod assembly (1-3) is connected to one end of the crank arm I (1-7) through a joint I (1-4) and a shaft pin I (1-5). The crank arm I (1-7) passes through the transverse shaft I (1-6) in the middle and drives it to rotate. One end of crank arm II (1-8) passes through horizontal shaft I (1-6). The rotation of horizontal shaft I (1-6) drives crank arm II (1-8) to rotate. The other end of crank arm II (1-8) is connected to one end of pull rod (1-11) through axle pin II (1-9) and connector II (1-10). The other end of pull rod (1-11) is connected to crank arm III (1-14) through connector III (1-12) and axle pin III (1-13). The rotation of crank arm III (1-14) drives another horizontal shaft II (1-15) to rotate. The ends of horizontal shaft I (1-6) and horizontal shaft II (1-15) are exposed in the transmission box (1) and are provided with a transmission mechanism connected to the lower conductive tube (2).

4. The optimized main switch structure of a single-column double-arm vertical telescopic disconnector according to claim 3, characterized in that, In the transmission mechanism, clamp I (1-17) is fixed to horizontal shaft I (1-6) or horizontal shaft II (1-15) by expansion pin (1-16), pipe clamp (1-18) is fixed to clamp I (1-17) by bolt, and clamp II (1-19) is fixed to pipe clamp (1-18) by bolt to connect the lower conductive pipe (2).

5. The optimized main switch structure of a single-column double-arm vertical telescopic disconnector according to claim 3, characterized in that, The transmission box (1) is equipped with a balance spring (1-20) for balancing the weight of the lower conductive tube (2), the upper conductive tube (4) and the movable joint (3).

6. The optimized main switch structure of a single-column double-arm vertical telescopic disconnector according to claim 1, characterized in that, The lower conductive tube (2) and the movable joint (3) are fixedly connected by a welding structure, as are the upper conductive tube (4) and the movable joint (3).

7. The optimized main switch structure of a single-column double-arm vertical telescopic disconnector according to claim 1, characterized in that, The upper conductive tube (4) includes two sets, left and right. The two sets of upper conductive tubes are bent at their intersection and then pivotally connected by a pivot pin. The movable joint (3) is connected at the intersection of the two sets of lower conductive tubes (2) and upper conductive tubes (4).

8. The optimized main switch structure of a single-column double-arm vertical telescopic disconnector according to claim 1, characterized in that, The upper conductive tube (4) includes two sets, left and right. The two sets of upper conductive tubes (4) are respectively connected to the two forks of a Y-shaped connector. The rod of the Y-shaped connector is fixedly connected to the lower conductive tube (2).

9. The optimized main switch structure of a single-column double-arm vertical telescopic disconnector according to claim 1, characterized in that, The moving contact (5) is fixed to the end of the upper conductive tube (4) by a rivet.

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