Novel indoor three-pole isolating switch with grounding knife-switch

Abstract

The invention discloses a novel indoor three-pole isolation switch with a grounding knife-switch, and relates to the technical field of power systems. The technical key points are that the switch comprises a switch chassis, a main knife switch part and a grounding knife switch part are arranged on the switch chassis, one end of the main knife switch part is connected with a main knife switch transmission mechanism, and one end of the grounding knife switch part is connected with a grounding knife switch transmission mechanism; a mechanical interlocking mechanism is arranged between the grounding knife-switch transmission mechanism and the main knife-switch transmission mechanism, and the mechanical interlocking mechanism is used for preventing the main knife-switch part and the grounding knife-switch part from being switched on at the same time; the grounding knife switch transmission mechanism and the main knife switch transmission mechanism are respectively provided with a position signal assembly and a key locking assembly. The mechanical interlocking mechanisms are arranged on the main knife switch part and the grounding knife switch part, so that power supply line faults caused by misoperation can be prevented during use, unsafe operation is prevented, and the device is high in practicability and convenient to popularize and use.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and in particular to a novel indoor three-pole disconnector with a grounding switch. Background Art

[0002] Isolators in power systems are key equipment for ensuring power supply safety, flexibility, and maintenance reliability. Their functions include electrical isolation, power supply mode switching, and grounding protection. Based on power supply requirements, these disconnectors connect or disconnect circuits between catenary power supply segments, increasing power supply flexibility to meet maintenance and operational needs with varying power supply modes. During maintenance, they also electrically isolate the catenary equipment being repaired, ensuring a clear disconnection point to ensure the safety of both maintenance personnel and equipment.

[0003] To prevent residual charge on the line from endangering workers during maintenance, a grounding device is often required to ground the de-energized line. In the past, the grounding device used to discharge the line and the disconnector used to disconnect the power were two separate devices, installed in different locations. This not only took up a lot of indoor space but was also inconvenient to operate. Consequently, disconnectors with grounding switches, which integrate the grounding device and disconnector, have gradually become more convenient. However, in actual disconnectors with grounding switches, the grounding module and the main switch module are still two separate devices. During actual operation, there is a risk that a worker may accidentally close the grounding switch when closing the main switch of the disconnector, or that a worker may accidentally close the main switch while the grounding switch is already closed. These situations can cause a short circuit, which can damage some components of the disconnector at the very least, or even paralyze the power supply system, causing widespread power outages. The strong arc and explosive shock wave generated by the short circuit can directly endanger the safety of nearby operators. Summary of the Invention

[0004] The present application provides a novel indoor three-pole disconnector with a grounding knife switch, which can reduce the risk of short-circuit accidents caused by misclosing the disconnector when in use.

[0005] The above-mentioned purpose of this application is achieved through the following technical solutions: A novel indoor three-pole disconnector with an earthing switch comprises a switch chassis, on which a main switch portion and an earthing switch portion are arranged side by side, one end of the main switch portion is connected to a main switch transmission mechanism, and one end of the earthing switch portion is connected to a earthing switch transmission mechanism; The main knife switch transmission mechanism is used to drive the main knife switch part to perform opening and closing operations; the grounding knife switch transmission mechanism is used to drive the grounding knife switch part to perform opening and closing operations; A mechanical interlocking mechanism is provided between the grounding knife switch transmission mechanism and the main knife switch transmission mechanism, and the mechanical interlocking mechanism is used to prevent the main knife switch part and the grounding knife switch part from being closed at the same time; The grounding knife switch transmission mechanism and the main knife switch transmission mechanism are both provided with a position signal component and a key locking component. The position signal component is used to transmit the status signal of the main knife switch part or the grounding knife switch part, and the key locking component is used to lock the main knife switch part or the grounding knife switch part in a specific state.

[0006] Furthermore, the main knife switch part includes a first support insulator and a second support insulator, the lower ends of the first support insulator and the second support insulator are fixedly mounted on the switch chassis, and the incoming terminal block and the outgoing terminal block are respectively mounted above the first support insulator and the second support insulator, and the incoming terminal block is hingedly connected to the isolating knife switch, and the middle position of the isolating knife switch is hinged to one end of the insulating pull rod, and the other end of the insulating pull rod is connected to the main knife switch transmission mechanism.

[0007] Furthermore, the main knife switch transmission mechanism includes a switch main shaft, which is movably mounted on the switch base, one end of the switch main shaft passes through the side plate on the corresponding side of the switch base and is connected to the electric operating mechanism, a first bracket is fixedly mounted on the switch main shaft, and the insulating pull rod is hinged to the first bracket at one end away from the isolating knife switch.

[0008] Furthermore, the grounding knife switch part includes a third supporting insulator, the lower end of the third supporting insulator is fixedly mounted on the switch chassis at the corresponding position, and an upper connecting copper bar is fixedly mounted on the top of the third supporting insulator, one end of the upper connecting copper bar is overlapped on the outlet terminal block and the two are fixedly connected, a grounding contact is installed on the lower side of the upper connecting copper bar, and a grounding knife switch body connected to the grounding knife switch transmission mechanism is provided below the grounding contact.

[0009] Furthermore, the grounding knife switch transmission mechanism includes a grounding main shaft, which is movably mounted on the switch base, one end of the grounding main shaft passes through the side plate on the corresponding side of the switch base and is connected to the manual operating mechanism, a second bracket is fixedly mounted on the grounding main shaft, and one end of the grounding knife switch body is fixedly connected to the second bracket.

[0010] Furthermore, the mechanical interlocking mechanism includes a locking support welding shaft and a first connecting plate, both ends of the first connecting plate are hinged to a fourth bracket via a locking pin and a third bracket, and the third bracket and the fourth bracket are fixedly sleeved on the grounding main shaft and the locking support welding shaft respectively; The locking support welding shaft is provided on a side of the switch main shaft close to the grounding main shaft, and the locking support welding shaft is rotatably connected to the side plate of the switch chassis at a corresponding position; The locking support welding shaft and the switch main shaft are respectively fixedly mounted with an intermediate crank arm and a rear crank arm at the same position along the length direction of the switch main shaft; The shape and specifications of the rear crank arm and the intermediate crank arm are the same. The angle between the arm rod of the rear crank arm and the horizontal plane is the same as the angle between the first bracket and the horizontal plane. The direction of the arm rod of the intermediate crank arm is opposite to that of the arm rod of the rear crank arm.

[0011] Furthermore, the position signal component includes an auxiliary switch, which is installed on the side of the switch base opposite to the main knife switch transmission mechanism. The input shaft of the auxiliary switch passes through the side plate on the corresponding side of the switch base and is hinged to one end of the second connecting plate through a traction arm. The other end of the second connecting plate is hinged to one of the first brackets on the switch main shaft or one of the second brackets on the grounding main shaft through a pin.

[0012] Furthermore, the key locking assembly includes a knife lock bracket, which is installed on the outside of the electric operating mechanism or manual operating mechanism housing, and a lock is installed on the knife lock bracket. A lock block is provided on one side of the lock tongue end of the lock, and a notch is provided on the lock block that matches the specifications of the lock tongue, and the lock block is fixedly sleeved on the switch main shaft or the grounding main shaft.

[0013] Furthermore, the contact rods on the incoming wiring board are fixed by bolts.

[0014] Furthermore, the first supporting insulator, the second supporting insulator and the third supporting insulator are pressed and molded by epoxy resin material; and the insulating pull rod is pressed and molded by epoxy resin and SMC material.

[0015] In summary, this application includes at least one of the following beneficial technical effects: The present invention arranges the main knife switch part and the grounding knife switch part on the same switch chassis, which can facilitate the staff to quickly realize the line connection and disconnection and grounding discharge operations in the power system in a short time according to needs. In addition, the present application adds a mechanical interlocking mechanism between the grounding knife switch transmission mechanism and the main knife switch transmission mechanism, so that there is a mechanical connection between the grounding knife switch transmission mechanism and the main knife switch transmission mechanism, so as to avoid the problem of simultaneous closing of the main knife switch part and the grounding knife switch part due to worker misoperation, causing unnecessary damage to the power supply system or some equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 It is a top view of the overall structure of this application; Figure 2 It is from Figure 1 A is a schematic diagram of the structure after it is cut open; Figure 3 This is a schematic diagram of the structure when observing from one side of the position signal component provided in the present application; Figure 4 This is a top view of the switch chassis of the present application with the manual operating mechanism and electric operating mechanism and other parts of the structure removed; Figure 5 This is a side view of the partial structure after the side panel on the side where the auxiliary switch is installed on the switch chassis of the present application is cut away; Figure 6 This is a structural diagram of the isolation knife switch of this application; Figure 7 This is a structural diagram of the grounding switch body of the present application; Figure 8 This is a schematic diagram of the connection between the incoming wiring board and the contact rod thereon; Figure 9 This is a schematic diagram of the structure of the present application when viewed from the side with the key locking assembly; Figure 10 These are the three states of the isolating switch of the present application when in actual use.

[0018] Figure numerals: 1. switch chassis; 2. main knife switch part; 21. first supporting insulator; 22. second supporting insulator; 23. incoming terminal block; 24. outgoing terminal block; 25. isolating knife switch; 251. first isolating blade; 252. first spring; 253. spring pressure plate; 254. short screw; 255. long screw; 256. threaded shaft; 257. support sleeve; 26. insulating pull rod; 3. grounding knife switch part; 31. third supporting insulator; 32. upper connecting copper bar; 33. grounding contact; 34. grounding knife switch body; 341. second isolating blade; 342. grounding rod; 343. knife support short sleeve; 344. knife pressure shaft; 345. second spring; 346. spring pressure piece; 4. main knife switch transmission mechanism; 41. switch main shaft ;42. Electric operating mechanism;43. First bracket;5. Grounding knife switch transmission mechanism;51. Grounding main shaft;52. Manual operating mechanism;53. Second bracket;6. Mechanical interlocking mechanism;61. Locking support welding shaft;62. First connecting plate;63. Locking pin;64. Third bracket;65. Fourth bracket;66. Middle crank arm;67. Rear crank arm;7. Position signal component;71. Auxiliary switch;72. Traction crank arm;73. Second connecting plate;8. Key locking component;81. First locking component;811. Main knife lock bracket;812. First lock block;813. First lock;82. Second locking component;821. Grounding knife lock bracket;822. Second lock block;823. Second lock;9. Grounding bar;10. Contact rod. DETAILED DESCRIPTION

[0019] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of this application.

[0020] like Figure 1 and Figure 9 As shown in the figure, a novel indoor three-pole disconnector with a grounding switch disclosed in the present application comprises a switch chassis 1, on which a main switch portion 2 and a grounding switch portion 3 are arranged side by side. One end of the main switch portion 2 is connected to a main switch transmission mechanism 4, and one end of the grounding switch portion 3 is connected to a grounding switch transmission mechanism 5. The main knife switch transmission mechanism 4 is used to drive the main knife switch part 2 to perform opening and closing operations; the grounding knife switch transmission mechanism 5 is used to drive the grounding knife switch part 3 to perform opening and closing operations; A mechanical interlocking mechanism 6 is provided between the earthing knife switch transmission mechanism 5 and the main knife switch transmission mechanism 4. The mechanical interlocking mechanism 6 is used to prevent the main knife switch part 2 and the earthing knife switch part 3 from being closed at the same time. The grounding knife switch transmission mechanism 5 and the main knife switch transmission mechanism 4 are both provided with a position signal component 7 and a key locking component 8. The position signal component 7 is used to transmit the status signal of the main knife switch part 2 or the grounding knife switch part 3, and the key locking component 8 is used to lock the main knife switch part 2 or the grounding knife switch part 3 in a specific state.

[0021] In the above embodiments, the main switch part 2 used for turning on and off power and the grounding switch part 3 used for discharging during maintenance are both arranged on the same switch chassis 1. This not only facilitates operation, but also saves the connection distance between the grounding switch and the main switch part 2.

[0022] The on-off (also called opening and closing) operation of the main knife switch part 2 is mainly realized by the main knife switch transmission mechanism 4, and the on-off operation of the grounding knife switch part 3 is mainly realized by the grounding knife switch transmission mechanism 5. The grounding knife switch transmission mechanism 5 and the main knife switch transmission mechanism 4 are both provided with a position signal component 7 and a key locking component 8. The position signal component 7 is used to visualize the specific opening and closing status of the main knife switch part 2 and the grounding knife switch part 3, so that relevant personnel can control the actual situation of the disconnector in time. The key locking component 8 is convenient for relevant personnel to use the key to lock the position of the grounding knife switch transmission mechanism 5 or the main knife switch transmission mechanism 4 when it is in place to avoid accidental touch and affect the safety and stability of the power supply system.

[0023] However, if the relevant personnel do not use the key locking assembly 8 to fix the position of the grounding knife switch part 3 in time after adjusting the main knife switch part 2 to the closed state, if the grounding knife switch part 3 is accidentally touched at this time, there will still be a risk of short circuit. Or, if the relevant personnel close the grounding knife switch part 3 (that is, adjust the entire system to the grounded state) but do not use the key locking assembly 8 to fix the position of the main knife switch part 2 in time, if the main knife switch part 2 is accidentally touched by the relevant personnel, there will still be a risk of short circuit in the power supply system or part of the equipment. For this reason, the present application adds a mechanical interlocking mechanism 6 between the main knife switch transmission mechanism 4 and the grounding knife switch transmission mechanism 5. After the mechanism 5 drives the main knife switch part 2 to close, the mechanical interlocking mechanism 6 will synchronously restrict the grounding knife switch transmission mechanism 5 used to drive the grounding knife switch part 3, so that the grounding knife switch part 3 cannot complete the grounding operation when the main knife switch part 2 is in the closed state. Similarly, when the grounding knife switch part 3 is in the grounded state, the mechanical interlocking mechanism 6 will also restrict the main knife switch transmission mechanism 4 through the grounding knife switch transmission mechanism 5 to ensure that the main knife switch part 2 cannot complete the grounding operation when the grounding knife switch part 3 is in the grounded state. This can further prevent the power supply line failure caused by misoperation and prevent unsafe operations. It is highly practical and easy to promote and use.

[0024] Furthermore, if Figure 1-Figure 3As shown, the main switch part 2 includes a first support insulator 21 and a second support insulator 22. The lower ends of the first support insulator 21 and the second support insulator 22 are fixedly mounted on the switch chassis 1. An incoming wiring board 23 and an outgoing wiring board 24 are respectively mounted above the first support insulator 21 and the second support insulator 22. An isolating switch 25 is hinged on the incoming wiring board 23. The middle position of the isolating switch 25 is hinged to one end of an insulating pull rod 26. The other end of the insulating pull rod 26 is connected to the main switch transmission mechanism 4.

[0025] In the above embodiment, the incoming wiring board 23 at the upper end of the first support insulator 21 of the present application is the centralized connection point of the power incoming line in the power system. The main switch transmission mechanism 4 drives the insulating pull rod 26 up and down during operation, thereby driving the isolating switch 25 connected thereto to swing up and down around the hinge point with the incoming wiring board 23. When the insulating pull rod 26 moves downward, the end of the isolating switch 25 away from the incoming wiring board 23 will gradually approach the outgoing wiring board 24 on the second support insulator 22. When the isolating switch 25 is connected to the outgoing wiring board 24, the current can flow smoothly from the outgoing wiring board 24 to different branch loads. If a tripping operation is to be performed, the main switch transmission mechanism 4 can drive the insulating pull rod 26 upward, thereby driving the end of the isolating switch 25 away from the incoming wiring board 23 to be lifted from the outgoing wiring board 24, so that a clear breakpoint can be generated between the two to isolate the fault section or the equipment to be repaired.

[0026] like Figure 3 and Figure 6As shown, the specific structure of the isolation knife switch 25 includes a first isolation blade 251, a first spring 252, a spring pressure plate 253, a short screw 254, a long screw 255, a threaded shaft 256 and a support sleeve 257. The specific connection diagram of these components can be seen in the figure. It can be seen from the figure that the short screw 254 passes through a first isolation blade 251, a support sleeve 257, a first isolation blade 251, a support sleeve 257, a first isolation blade 251, a support sleeve 257, a first isolation blade 251, a support sleeve 257, and the last first isolation blade 251 from left to right, and double nuts are used to fix it at both ends of the short screw 254 to ensure the stability of the short screw 254 during use. The short screw 254 at the bottom passes through the insulating pull The upper ends of rod 26 are hingedly connected, allowing the insulating pull rod 26 to move with the entire isolation switch 25 through the short screw 254 connected to it during operation. The long screw 255 is located on the upper and lower sides of the short screw 254, and each of them passes through, from left to right, a spring pressure piece 346, a spring, a spring pressure piece 346, a first isolation blade 251, a support sleeve 257, a first isolation blade 251, a support sleeve 257, a first isolation blade 251, a support sleeve 257, a first isolation blade 251, a spring pressure piece 346, a spring, and finally a spring pressure piece 346, and is finally secured at both ends with stainless steel anti-retraction nuts. The threaded shaft 256 is used to mount the isolation switch 25 as a whole on the outlet terminal block 24. The main switch portion 2 is the primary component of the isolating switch that conducts current. The contact performance of the isolation switch 25 is primarily determined by machining accuracy and spring pressure. In actual production, the two ends of the isolation knife gate 25 of the present application can preferably be fastened with a spring pressure plate 253 and a spring made of stainless steel. The spring of this material has good elasticity. The short screw 254 and the long screw 255 set at different positions on the isolation knife gate 25 can be tightened and adjusted with nuts to ensure that the first isolation blade 251 is evenly stressed during use, so that the contact performance is optimized.

[0027] Furthermore, if Figure 1-Figure 3 As shown, the main knife switch transmission mechanism 4 includes a switch main shaft 41, which is movably mounted on the switch base 1. One end of the switch main shaft 41 passes through the side plate on the corresponding side of the switch base 1 and is connected to the electric operating mechanism 42. A first bracket 43 is fixedly mounted on the switch main shaft 41, and the end of the insulating pull rod 26 away from the isolating knife switch 25 is hinged to the first bracket 43.

[0028] In the above embodiments, the electric operating mechanism 42 generally includes components such as an electric motor, a worm gear reducer, and a manual operating shaft. It is an electric device commonly used in existing disconnectors, so the relevant specific structure and working principle are not described in detail here. After starting, the electric operating mechanism 42 can drive the switch main shaft 41 connected to it to rotate around its own axis on the switch chassis 1, and the switch main shaft 41 is hinged to one end of the insulating pull rod 26 through the first bracket 43, and the other end of the insulating pull rod 26 is hinged to the isolation knife switch 25. In this way, during the rotation of the switch main shaft 41, the height of the connection point between the first bracket 43 and the insulating pull rod 26 will change, and the position of the isolation knife switch 25 is limited by its connection point with the incoming terminal board 23. The insulating pull rod 26 will swing up and down with the isolation knife switch 25 away from the incoming terminal board 23, thereby realizing the isolation knife switch 25 away from the incoming terminal board 23 and performing the opening and closing operation at the outgoing terminal board 24.

[0029] Furthermore, if Figure 1 、 Figure 2 and Figure 5 As shown, the grounding knife switch part 3 includes a third support insulator 31, the lower end of the third support insulator 31 is fixedly mounted on the switch chassis 1 at the corresponding position, and an upper connecting copper bar 32 is fixedly mounted on the top of the third support insulator 31. One end of the upper connecting copper bar 32 is overlapped on the outlet terminal block 24 and the two are fixedly connected. A grounding contact 33 is installed on the lower side of the upper connecting copper bar 32, and a grounding knife switch body 34 connected to the grounding knife switch transmission mechanism 5 is provided below the grounding contact 33.

[0030] In the above embodiment, part of the upper connecting copper bar 32 is mounted on the third support insulator 31 by bolts and nuts, and part of the upper connecting copper bar 32 is mounted on the outlet terminal block 24 by bolts and nuts. A grounding contact 33 is provided on the lower side of the part of the upper connecting copper bar 32 located between the third support insulator 31 and the outlet terminal block 24. In this way, when the grounding knife switch transmission mechanism 5 drives the grounding knife switch body 34 to touch the grounding contact 33, the grounding knife switch body 34 connected to the ground wire can be connected to the outlet terminal block 24 through the upper connecting copper bar 32, thereby achieving the effect of releasing the residual current in the power branch or equipment connected to the outlet terminal block 24 through the grounding line.

[0031] like Figure 4 and Figure 7As shown, the specific structure of the grounding knife switch body 34 generally includes a second isolation blade 341, a grounding rod 342, a short knife support sleeve 343, and a knife pressing shaft 344. After the knife pressing shaft 344 is inserted into the two isolation blades in sequence along the width direction of the grounding knife body, it is further tightened at both ends of the knife pressing shaft 344 with a second spring 345, a spring pressure piece 346 and a nut; one end of the grounding rod 342 is located between the two isolation blades, and they are fixed together by bolts and nuts, and the other end of the grounding rod 342 is connected to the grounding knife switch transmission mechanism 5. In this way, when the grounding knife switch body 34 swings with the grounding knife switch transmission mechanism 5, the two second isolation blades 341 can achieve stable on-off operations with the grounding contacts 33 at the corresponding positions. In addition, in actual use, multiple grounding switch bodies 34 are usually provided. At this time, a grounding bar 9 can be added between the grounding switch bodies 34 to connect them in parallel, and the grounding bar 9 is made of T2 copper. In this way, after the grounding bar 9 of the isolating switch connects the three-pole isolating grounding switch together, the synchronization of the three-pole isolating switch grounding switch can be effectively guaranteed during use.

[0032] Furthermore, if Figure 1 and Figure 2 As shown, the grounding knife switch transmission mechanism 5 includes a grounding main shaft 51, which is movably mounted on the switch base 1. One end of the grounding main shaft 51 passes through the side plate on the corresponding side of the switch base 1 and is connected to the manual operating mechanism 52. A second bracket 53 is fixedly mounted on the grounding main shaft 51, and one end of the grounding knife switch body 34 is fixedly connected to the second bracket 53.

[0033] In the above embodiments, when the existing grounding knife switch is in use, its driving portion can be divided into a manual operating mechanism 52 and an electric operating mechanism 42 according to the operating mode. The grounding knife switch of the present application uses a manual operating portion and a worm gear reducer as the power input of the manual operating mechanism 52. Compared with the visual remote operation electric operating mechanism 42 (which requires a communication module, motor drive, etc.), the manual grounding knife switch eliminates the need for an electronic control system, greatly reducing procurement costs. At the same time, it is very convenient to install and maintain, and is particularly suitable for maintenance scenarios of small and medium-sized substations or rail vehicle depots with limited budgets. Manual grounding knife switches are generally used mainly during line system maintenance, and their operating reliability is particularly important because manual operation relies entirely on manpower and does not require an external power supply or compressed air. Even in the event of a power outage or gas source failure, emergency operation can still be performed to ensure system safety. Therefore, the power portion of the grounding knife switch body 34 of the present application is preferably a manual operating mechanism 52. The manual operating mechanism 52 of the present application is installed on the outer side of one side plate of the switch chassis 1, and is connected to one end of the grounding main shaft 51 that passes through the side plate of the switch chassis 1. When the worker rotates the manual operating mechanism 52 through a special crank handle or other tool, the grounding main shaft 51 can be driven to rotate around its own axis on the switch chassis 1, and the second bracket 53 fixed on the grounding main shaft 51 is fixedly connected to the grounding rod 342 in the grounding knife switch body 34 through bolts and nuts. Therefore, during the rotation process of the grounding main shaft 51, the grounding knife switch body 34 can be swung synchronously with it, and different rotation directions of the grounding main shaft 51 can achieve the on-off effect of the grounding knife switch body 34 and the grounding contact 33 at the corresponding position.

[0034] Furthermore, if Figure 1 、 Figure 3 and Figure 4 As shown, the mechanical interlocking mechanism 6 includes a locking support welding shaft 61 and a first connecting plate 62. The two ends of the first connecting plate 62 are respectively hinged to the fourth bracket 65 through a locking pin 63 and a third bracket 64. The third bracket 64 and the fourth bracket 65 are fixedly mounted on the grounding main shaft 51 and the locking support welding shaft 61 respectively. The locking support welding shaft 61 is provided on the side of the switch main shaft 41 close to the grounding main shaft 51, and the locking support welding shaft 61 is rotatably connected to the side plate of the switch chassis 1 at the corresponding position; The locking support welding shaft 61 and the switch main shaft 41 are respectively fixedly mounted with a middle crank arm 66 and a rear crank arm 67 at the same position along the length direction of the switch main shaft 41; The rear crank arm 67 and the middle crank arm 66 have the same shape and specifications. The angle between the arm rod of the rear crank arm 67 and the horizontal plane is the same as the angle between the first bracket 43 and the horizontal plane. The direction of the arm rod of the middle crank arm 66 is opposite to that of the rear crank arm 67.

[0035] In the above embodiment, the two ends of the first connecting plate 62 of the present application are hinged to the third bracket 64 and the fourth bracket 65 respectively, the end of the third bracket 64 away from the first connecting plate 62 is installed on the grounding main shaft 51, and the end of the fourth bracket 65 away from the first connecting plate 62 is installed on the locking support welding shaft 61, and the locking support welding shaft 61 is rotatably connected to the switch base 1, so that the third bracket 64, the first connecting plate 62 and the fourth bracket 65 can form a four-bar linkage mechanism between the grounding main shaft 51 and the locking support welding shaft 61 that can stably transmit power, and the quadrilateral formed by connecting the hinge points between the first connecting plate 62 and the third bracket 64 and the fourth bracket 65, and the center points of the grounding main shaft 51 and the locking support welding shaft 61 in sequence is a parallelogram. This ensures that the rotation of the grounding main shaft 51 can not only drive the locking support welding shaft 61 to rotate together, but also that the rotation angles of the two are always kept synchronized. The intermediate crank arm 66 and the rear crank arm 67 of the present application have similar structures and are composed of a mounting ring and an arm rod of a certain length. Although the arm rods of the intermediate crank arm 66 mounted on the locking support welding shaft 61 and the rear crank arm 67 mounted on the switch main shaft 41 are parallel, their extension directions on their respective mounting rings are opposite. The inclination angle and direction of the arm rod of the rear crank arm 67 on the switch main shaft 41 are the same as the inclination angle and direction of the first bracket 43 on the switch main shaft 41. The inclination angle and direction of the first bracket 43 are also the same as the inclination angle and direction of the isolation knife switch 25. In this way, when the switch main shaft 41 is rotating, the rear crank arm 67 can reflect the swing angle of the isolation knife switch 25 in real time. When setting, the distance between 61 and the switch main shaft 41 is the same as the distance from the farthest end of the intermediate crank arm 66 arm to the center of the switch main shaft 41, so as to ensure that the intermediate crank arm 66 can swing smoothly with the isolation knife switch 25 until the isolation knife switch 25 and the incoming wiring board 23 are in the closed state. In addition, the specifications of the rear crank arm 67 and the intermediate crank arm 66 of this application are the same. When the isolation knife switch 25 is closed on the incoming wiring board 23, the rear crank arm 67 will just abut the root of the connection between the arm of the intermediate crank arm 66 and its mounting ring. This action is realized synchronously when the isolation knife switch 25 is closed. At this time, as long as the isolation knife switch 25 does not move, the rear crank arm 67 can restrict the position of the intermediate crank arm 66 so that the grounding main shaft 51 cannot rotate. Similarly, when the grounding main shaft 51 drives the grounding knife switch body 34 and the grounding contact 33 to close, the middle crank arm 66 on the locking support welding shaft 61, which is linked to the grounding main shaft 51 through a mechanical structure, will abut against the rear crank arm 67 to limit it, so as to ensure that when the grounding knife switch body 34 is closed, the isolation knife cannot be closed. Therefore, the switch of this application has only three safe working states when in use, such as Figure 10As shown, namely: the isolating knife switch 25 (equivalent to the main knife switch in the text part of the figure) and the grounding knife switch body 34 (equivalent to the grounding knife in the text part of the figure) are in the open state at the same time; the isolating knife switch 25 is in the closed state, and the grounding knife switch body 34 is in the open state; the isolating knife switch 25 is in the open state, and the grounding knife switch body 34 is in the closed state. The isolating switch of the present application is provided with the above-mentioned mechanical interlocking structure, which can automatically mechanically lock the other knife switch when the grounding knife switch body 34 or the isolating knife switch 25 is in the closed state. This can prevent the power supply line fault caused by misoperation and prevent unsafe operation. It is highly practical and easy to promote and use.

[0036] In actual production, if the motor cannot be powered off normally (that is, the motor is still rotating when it needs to be stopped), the mechanical interlocking mechanism 6 of the present application may hold the switch main shaft 41. If it is not discovered and handled in time, the motor will be blocked or even heat up and burn out. Therefore, the present application can install a mechanical torque overload protection device at the front end of the motor in the electric operating mechanism 42 (such as a friction coupling is a commonly used mechanical torque overload protection device). In this way, even if the above situation occurs, the motor will not be blocked or even burned out.

[0037] Furthermore, if Figure 1 、 Figure 3 and Figure 5 As shown, the position signal component 7 includes an auxiliary switch 71, which is installed on the side of the switch chassis 1 opposite to the main knife switch transmission mechanism 4. The input shaft of the auxiliary switch 71 passes through the side plate on the corresponding side of the switch chassis 1 and is hinged to one end of the second connecting plate 73 through a traction crank arm 72. The other end of the second connecting plate 73 is hinged to one of the first brackets 43 on the switch main shaft 41 or one of the second brackets 53 on the grounding main shaft 51 through a pin.

[0038] In the above embodiment, the signal input shaft in the auxiliary switch in the position signal assembly 7 of the present application is connected to one end of the second connecting plate 73 through the traction crank arm 72, and the other end of the second connecting plate 73 is hinged to the second bracket 53 on the switch main shaft 41 or the grounding main shaft 51 through a pin. In this way, when the switch main shaft 41 or the grounding main shaft 51 rotates with the second bracket 53 on each of them, the second bracket 53 will change the position of the second connecting plate 73 connected to the end thereof, and the other end of the second connecting plate 73 will cause the signal input shaft in the auxiliary switch 71 to move synchronously through the traction crank arm 72, and the auxiliary switch 71 can collect the mechanical signal. And convert it into an electrical signal, so that when the isolating knife switch 25 or the grounding knife switch main body 34 of the present application is in the closed or open position state, the corresponding position contact signal can be provided through the auxiliary switch 71 (generally, the conductive contact signal is collected. Taking the isolating switch knife switch as an example, that is, when the isolating switch knife switch is closed, the closed position signal can be output, at this time, the open position signal is in the disconnected state; when the isolating switch knife switch is open, the open position signal can be output, at this time, the closed position signal is in the disconnected state. The position signals of the main knife switch and the grounding knife switch are implemented in the same way), thereby realizing the status monitoring of the power system and improving the safety of operation.

[0039] Furthermore, if Figure 9 As shown, the key locking assembly 8 includes a knife lock bracket, which is installed on the outside of the housing of the electric operating mechanism 42 or the manual operating mechanism 52. A lock is installed on the knife lock bracket, and a lock block is provided on one side of the lock tongue end of the lock. The lock block is provided with a notch that matches the specifications of the lock tongue, and the lock block fixing sleeve is provided on the switch main shaft 41 or the grounding main shaft 51.

[0040] In the above embodiment, for the convenience of understanding, the key locking assembly 8 at the switch main shaft 41 is called the first key locking assembly 8, the key locking assembly 8 at the grounding main shaft 51 is called the second key locking assembly 8, the knife lock bracket in the first key locking assembly 8 is called the main knife lock bracket 811, and the knife lock bracket in the second key locking assembly 8 is called the ground knife lock bracket 821. The main knife lock bracket 811 in the first key locking assembly 8 is fixedly mounted on the outer side of the electric operating machine part housing on the switch chassis 1, and the ground knife lock bracket 821 in the second key locking assembly 8 is mounted on the manual operating mechanism 52 housing on the switch chassis 1. On the outside of the body, the two lock blocks in the first key locking assembly 8 and the second key locking assembly 8 are respectively the first lock block 812 and the second lock block 822, which are respectively mounted on the switch main shaft 41 and the grounding main shaft 51. The first lock block 812 and the second lock block 822 are both provided with a notch for accommodating the lock tongue of the lock. The specific position of the notch is determined according to the structural function at the corresponding position. For example, in order to avoid accidental closing of the isolation knife switch 25, the notch on the first lock block 812 in the first locking assembly 81 can be made to face the first locking assembly when the isolation knife switch 25 is in the closed state. The first lock 813 in 81 has a lock tongue, so that the worker can fix the first lock block 812 by turning the key on the first lock 813, thereby preventing the isolation knife switch 25 from being accidentally closed. Similarly, to prevent the grounding knife switch body 34 from being accidentally closed, the opening of the second lock block 822 on the grounding spindle 51 can be made when the grounding knife switch body 34 is in the open state. The notch on the second lock block 822 is just opposite to the lock tongue of the second lock 823 in the first locking assembly 81, so that the worker can lock the position of the grounding knife switch body 34 by turning the key on the second lock 823, and the isolation knife switch can be closed by the key. During use, to prevent the grounding switch body 34 from accidentally opening, thereby preventing residual current in the power grid or equipment under maintenance from being completely discharged, a second lock 823 can be added to the second locking assembly 82. This lock is at a 90° angle to the previous second lock 823. In this way, when the grounding switch body 34 rotates from the horizontal position when open to the numerical position when closed, the notch on the second lock stop 822 in the second locking assembly 82 can be aligned with the lock tongue of the additional second lock 823. In this way, the worker can also lock the position of the grounding switch body 34 when closed using the key on this lock. In this way, the worker can manage the opening and closing of the isolating switch and the grounding switch by managing the keys on different locks. That is, when the key is locked, the lock tongue of the lock extends, the corresponding lock stop is blocked, the corresponding main shaft cannot rotate, and the isolating switch or the grounding switch cannot operate. This further improves the safety of the isolating switch of the present application during use.Based on the differences in their functional positioning and safety risk levels in the power system, the first lock 813 in the first locking assembly 81 can preferably be a double-cylinder lock, and the second lock 823 in the second locking assembly 82 can preferably be a single-cylinder lock. Regarding the specific selection of the lock, this application is only an example for illustration and does not make any special limitations. Technical personnel in this field can make adaptive choices based on actual on-site conditions.

[0041] Furthermore, if Figure 3 and Figure 8 As shown, the contact rod 10 on the incoming terminal block 23 is fixed by bolts.

[0042] In the above embodiment, the contact rod 10 and the incoming terminal block 23 are directly fixed by bolts. The conductive components of this application are all made of T2 copper. Although the conductive properties are relatively high, the hardness is relatively soft, and long-term use will cause certain mechanical wear. This design only requires the contact rod 10 to be replaced in a targeted manner when the contact rod 10 is worn, which can greatly reduce the subsequent product maintenance and maintenance costs and construction intensity, and improve work efficiency. In addition, the contact rod 10 on the outgoing terminal block 24 of this application can also be fixed by bolts. This can also improve work efficiency and reduce maintenance costs when the contact rod 10 on the outgoing terminal block 24 is subsequently worn.

[0043] Furthermore, the first supporting insulator 21 , the second supporting insulator 22 and the third supporting insulator 31 are formed by pressing epoxy resin material; and the insulating pull rod 26 is formed by pressing epoxy resin and SMC material.

[0044] In the above embodiment, the first support insulator 21, the second support insulator 22, and the third support insulator 31 are all press-molded from epoxy resin, a material that exhibits high insulation and strength, with a creepage distance of up to 250 mm. The insulating rod 26 is press-molded from epoxy resin and SMC, a material that also exhibits high insulation and strength, with a creepage distance of up to 250 mm.

[0045] The working principle of this embodiment is as follows: During normal use, the disconnector of this application can be locked in the open position by a worker using the key lock assembly 8 on the outside of the manual operating mechanism 52 to prevent the grounding knife switch body 34 on the grounding main shaft 51 from accidentally closing together with the isolation knife switch 25 during use, thereby causing a short circuit in the power system. At this time, the worker can use the motor or manual operating part of the electric operating mechanism 42 to drive the switch main shaft 41 to move the isolation knife switch 25. When the end of the isolation knife switch 25 away from the incoming wiring board 23 is in stable contact with the contact rod 10 on the corresponding position of the outgoing wiring board 24, the power system disconnector portion can be closed. When the end of the isolation knife switch 25 away from the incoming wiring board 23 is separated from the corresponding position of the outgoing wiring board 24, the power system disconnector portion can be opened. The key lock assembly 8 is also provided on the outside of the electric operating mechanism 42 of this application, and the worker can also limit the position of the isolation knife switch 25 as needed. In addition, a mechanical interlocking mechanism 6 is added between the switch main shaft 41 and the grounding main shaft 51 of the present application. When the isolation knife switch 25 is in the closed state, the position of the grounding main shaft 51 can be automatically locked through the mechanical interlocking mechanism 6, so that the grounding knife switch body 34 cannot be manually closed to ensure the safety of the power system during normal use.

[0046] When the power system needs to be repaired, the worker must first use the key to open the lock in the key locking assembly 8 on the outside of the electric operating mechanism 42, restore the freedom of the switch main shaft 41, and then use the electric operating mechanism 42 to adjust the isolation knife switch 25 to the open state. Next, after the worker releases the restriction of the key locking assembly 8 on the grounding main shaft 51 on the outside of the manual operating mechanism 52, he can use a special crank handle to drive the isolation knife of the grounding knife switch body 34 through the manual operating mechanism 52 to connect with the grounding contact 33 on the outlet terminal board 24, forming a negative (or grounding) conduction position in the power supply system. At this time, the isolation knife switch 25 can be difficult to close electrically or manually under the action of the original electrical locking system and the key locking assembly 8 newly added in this application, thereby reducing the short circuit risk caused by the isolation knife switch 25 closing at the same time when the grounding knife switch body 34 is in the closed state.

[0047] In addition, the mechanical interlocking mechanism 6 set between the switch main shaft 41 and the grounding main shaft 51 of the present application can also automatically limit the position of the isolation knife switch 25. In this way, even if the traditional electrical locking system fails or the worker forgets to lock the newly added key locking component 8, the isolation knife switch 25 cannot be closed at the same time as the grounding knife switch body 34, which can further improve the safety of the entire isolation switch. The present application also installs an auxiliary signal unit on the switch main shaft 41 and the grounding main shaft 51. When the switch main shaft 41 or the grounding main shaft 51 rotates, the signal input shaft of the auxiliary switch 71 in the respective position signal components 7 can drive the pull plate to move. The pull plate of the auxiliary switch 71 will drive the auxiliary switch 71 to rotate, and finally achieve the effect of having a signal position contact output when the switch is open or closed.

[0048] Compared to the prior art, this application adds a mechanical interlocking mechanism 6 between the grounding knife switch rotation mechanism and the main knife switch transmission mechanism 4. When one is in the closed state, it can automatically and reliably mechanically limit the other, thereby improving the safety and stability of the entire switch. The contact rod 10 of the present application is detachably mounted on the incoming terminal block 23, which can reduce subsequent operating costs.

[0049] The primary conductive components in this application are preferably made of T2 conductive copper material, and the entire surface is silver-plated. This not only improves the current flow capacity, but also extends the service life of the conductive components. The electric operating mechanism 42 of this application can also be set to a manual priority operation mode during use. For example, an upper position switch is set near the manual operation part of the electric operating mechanism 42. When debugging or an electrical fault occurs, the worker manually operates the isolating switch by cranking the handle. At the same time, when the crank is inserted into the operating shaft of the manual operation part, the position switch can detect this information and promptly disconnect the motor operating circuit in the electric operating mechanism 42, preventing personal injury caused by malfunction of the motor and improving the safety protection level (this function is already available in existing isolating switches, and the specific structure and principle are not described here). A key locking assembly 8 is provided on the outside of the electric operating mechanism 42 and the manual operating mechanism 52 of the present application. When the switching action of the grounding switch body 34 or the isolating switch 25 is completed to opening or closing, the key on the corresponding position lock is turned to lock the corresponding switch main shaft 41 or the grounding main shaft 51 through the key locking assembly 8, so that it cannot be opened or closed. This further improves the safety and stability of the present application during use.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A novel indoor three-pole isolating switch with a grounding knife switch, comprising a switch chassis (1), characterized in that: A main switch portion (2) and a grounding switch portion (3) are arranged side by side on the switch chassis (1); one end of the main switch portion (2) is connected to a main switch transmission mechanism (4); and one end of the grounding switch portion (3) is connected to a grounding switch transmission mechanism (5); The main knife switch transmission mechanism (4) is used to drive the main knife switch part (2) to perform opening and closing operations; the grounding knife switch transmission mechanism (5) is used to drive the grounding knife switch part (3) to perform opening and closing operations; A mechanical interlocking mechanism (6) is provided between the grounding knife switch transmission mechanism (5) and the main knife switch transmission mechanism (4), and the mechanical interlocking mechanism (6) is used to prevent the main knife switch part (2) and the grounding knife switch part (3) from being closed at the same time; The grounding knife switch transmission mechanism (5) and the main knife switch transmission mechanism (4) are both provided with a position signal component (7) and a key locking component (8), wherein the position signal component (7) is used to transmit a status signal of the main knife switch part (2) or the grounding knife switch part (3), and the key locking component (8) is used to lock the main knife switch part (2) or the grounding knife switch part (3) in a specific state.

2. The novel indoor three-pole disconnector with grounding switch according to claim 1 is characterized in that: The main knife switch part (2) includes a first supporting insulator (21) and a second supporting insulator (22), the lower ends of the first supporting insulator (21) and the second supporting insulator (22) are fixedly mounted on the switch chassis (1), an incoming wiring board (23) and an outgoing wiring board (24) are mounted above the first supporting insulator (21) and the second supporting insulator (22), respectively, an isolating knife switch (25) is hinged on the incoming wiring board (23), the middle position of the isolating knife switch (25) is hinged to one end of an insulating pull rod (26), and the other end of the insulating pull rod (26) is connected to the main knife switch transmission mechanism (4).

3. The novel indoor three-pole disconnector with grounding switch according to claim 2 is characterized in that: The main knife switch transmission mechanism (4) includes a switch main shaft (41), which is movably mounted on the switch base (1). One end of the switch main shaft (41) passes through the side plate on the corresponding side of the switch base (1) and is connected to the electric operating mechanism (42). A first bracket (43) is fixedly mounted on the switch main shaft (41), and the end of the insulating pull rod (26) away from the isolating knife switch (25) is hinged to the first bracket (43).

4. The novel indoor three-pole disconnector with grounding switch according to claim 3 is characterized in that: The grounding knife switch part (3) includes a third supporting insulator (31), the lower end of the third supporting insulator (31) is fixedly mounted on the switch chassis (1) at a corresponding position, an upper connecting copper bar (32) is fixedly mounted on the top of the third supporting insulator (31), one end of the upper connecting copper bar (32) is overlapped on the outlet terminal board (24) and the two are fixedly connected, a grounding contact (33) is mounted on the lower side of the upper connecting copper bar (32), and a grounding knife switch body (34) connected to the grounding knife switch transmission mechanism (5) is provided below the grounding contact (33).

5. The novel indoor three-pole disconnector with grounding switch according to claim 4 is characterized in that: The grounding knife switch transmission mechanism (5) includes a grounding main shaft (51), the grounding main shaft (51) is movably mounted on the switch chassis (1), one end of the grounding main shaft (51) passes through the side plate on the corresponding side of the switch chassis (1) and is connected to the manual operating mechanism (52), a second bracket (53) is fixedly mounted on the grounding main shaft (51), and one end of the grounding knife switch body (34) is fixedly connected to the second bracket (53).

6. The novel indoor three-pole disconnector with grounding switch according to claim 5 is characterized in that: The mechanical interlocking mechanism (6) comprises a locking support welding shaft (61) and a first connecting plate (62), both ends of the first connecting plate (62) are hinged to a fourth bracket (65) via a locking pin (63) and a third bracket (64), and the third bracket (64) and the fourth bracket (65) are fixedly sleeved on the grounding main shaft (51) and the locking support welding shaft (61), respectively. The locking support welding shaft (61) is provided on a side of the switch main shaft (41) close to the grounding main shaft (51), and the locking support welding shaft (61) is rotatably connected to a side plate of the switch chassis (1) at a corresponding position; The locking support welding shaft (61) and the switch main shaft (41) are respectively fixedly mounted with a middle turning arm (66) and a rear turning arm (67) at the same position along the length direction of the switch main shaft (41); The rear crank arm (67) and the intermediate crank arm (66) have the same shape and specifications. The angle between the arm of the rear crank arm (67) and the horizontal plane is the same as the angle between the first bracket (43) and the horizontal plane. The direction of the arm of the intermediate crank arm (66) is opposite to the direction of the arm of the rear crank arm (67).

7. The novel indoor three-pole disconnector with grounding switch according to claim 5 is characterized in that: The position signal assembly (7) includes an auxiliary switch (71), which is mounted on a side of the switch chassis (1) opposite to the main switch transmission mechanism (4). The input shaft of the auxiliary switch (71) passes through the side plate on the corresponding side of the switch chassis (1) and is hinged to one end of a second connecting plate (73) through a traction crank arm (72). The other end of the second connecting plate (73) is hinged to one of the first brackets (43) on the switch main shaft (41) or one of the second brackets (53) on the grounding main shaft (51) through a pin.

8. The novel indoor three-pole disconnector with grounding switch according to any one of claims 5 to 7, characterized in that: The key locking assembly (8) comprises a knife lock bracket, the knife lock bracket is mounted on the outside of the housing of the electric operating mechanism (42) or the manual operating mechanism (52), a lock is mounted on the knife lock bracket, a lock block is provided on one side of the lock tongue end of the lock, a notch is provided on the lock block that matches the specifications of the lock tongue, and the lock block is fixedly sleeved on the switch main shaft (41) or the grounding main shaft (51).

9. The novel indoor three-pole disconnector with grounding switch according to claim 2 is characterized in that: The contact rod (10) on the incoming wiring board (23) is fixed by bolts.

10. The novel indoor three-pole disconnector with grounding switch according to claim 4 is characterized in that: The first supporting insulator (21), the second supporting insulator (22), and the third supporting insulator (31) are formed by pressing epoxy resin material; and the insulating pull rod (26) is formed by pressing epoxy resin and SMC material.

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