Direct-acting three-position disconnecting switch with intermediate limit

Abstract

The utility model relates to a kind of direct-acting three-position disconnectors with intermediate limiting, including shell, ground operating shaft and isolation operating shaft are arranged in the shell;Nut is sleeved on ground operating shaft and isolation operating shaft;Ground coil and isolation coil, two coils are installed on shell, when nut is in front and back intermediate position, the iron core of two coils is respectively blocked in the front and back two ends of nut, so as to limit nut in front and back intermediate position;The iron core of the ground coil is lifted, rotates ground operating shaft and is suitable for driving nut to move to front side position;The iron core of the isolation coil is lifted, rotates ground operating shaft and is suitable for driving nut to move to rear side position.By the ground coil and isolation coil set on shell, when disconnecting switch is in open position, nut is in front and back intermediate position, now nut is limited by the iron core of two coils, ensure that disconnecting switch is stable in open position.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment, specifically to a direct-acting three-position disconnect switch with intermediate limit. Background Technology

[0002] With the development of the domestic power market and the increase in application scenarios, C-GIS circuit breaker cabinets are being used more and more widely. The technical requirements for the three-position disconnect switches configured on them, especially the direct-acting three-position disconnect switches, are also increasing, and the reliability requirements are also getting higher and higher. Three-position refers to three positions, namely the closing position, the opening position, and the connection position.

[0003] Currently, there are two main types of direct-acting three-position disconnect switches on the market. One type is single-hole operation. Because this type of disconnector uses the same operating hole for closing, opening, and grounding, it is prone to misoperation. Improper operation may lead to safety accidents and even endanger the operator's personal safety. The second type is double-hole operation three-position disconnect switches. However, most double-hole disconnect switches on the market currently lack a fixed limit in the middle position (isolation position). Instead, they use a microswitch to cut off the electrical circuit signal, preventing the motor from rotating to maintain the middle position. This has a fatal flaw: if the electrical circuit contact reliability is compromised or the microswitch fails, the isolation position will be inaccurate, affecting the contact area between the moving and stationary contacts inside the circuit breaker. This can cause electrical circuit faults or, in severe cases, lead to circuit breaker cabinet explosions and safety accidents.

[0004] Even if some dual-hole direct-acting three-position disconnect switches have a fixed limit in the middle position to ensure the middle isolation position, because they use a coil tripping method, if the limit is too tight during operation, the coil cannot trip. If it cannot trip, it will be energized for a long time, causing the coil to burn out (it will burn out if it lasts more than 10 seconds), which in turn affects the normal operation of the three-position disconnect switch. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a direct-acting three-position disconnect switch with intermediate limit, which solves the technical problem that the disconnect switch is inaccurate in isolation position when it is in the middle position (open position) due to the lack of limit.

[0006] The technical solution adopted by this utility model to solve its technical problem is: First aspect: A direct-acting three-position disconnect switch with intermediate limit is provided, including... The housing contains a grounding operating shaft and an isolation operating shaft, which rotate synchronously. The grounding operating shaft is a lead screw, and the isolation operating shaft is a smooth rod. The nut is fitted onto the grounding operating shaft and the isolating operating shaft. When the isolating switch is open, the grounding operating shaft moves the nut to the middle position. When the isolating switch is closed, the grounding operating shaft moves the nut to the rear position. When the isolating switch is grounded, the grounding operating shaft moves the nut to the front position. The grounding coil and the isolation coil are both mounted on the housing. When the nut is in the front-to-back middle position, the iron cores of the two coils block the front and back ends of the nut respectively, thereby restricting the nut to the front-to-back middle position. The core of the grounding coil is raised, and the grounding operating shaft is rotated to move the nut to the front position; the core of the isolation coil is raised, and the grounding operating shaft is rotated to move the nut to the rear position.

[0007] Furthermore, it also includes a door lock plate, which moves left and right on the front side of the housing, and the door lock plate is provided with a right pressure plate and a left pressure plate; The first grounding lever and the first isolation lever are rotatably connected on the housing. One end of the first grounding lever is connected to the iron core of the grounding coil, and one end of the first isolation lever is connected to the iron core of the isolation coil. When the door lock plate is in the middle position, the door lock plate blocks the grounding operation hole and the isolation operation hole on the panel. When the door lock plate moves to the right side, the grounding operation hole opens, and the first grounding lever is pressed down by the right pressure plate, thereby causing the iron core of the grounding coil to rise and unlock. When the door lock plate moves to the left side, the isolation operation hole opens, and the first isolation lever is pressed down by the left pressure plate, thereby driving the iron core of the isolation coil to rise and unlock.

[0008] Furthermore, the housing is provided with an isolation limit pin and a grounding limit pin, which are respectively located on the left and right sides of the door lock plate and can move elastically back and forth on the housing; When the nut moves to the front position, it pushes the isolation limit pin forward. At this time, the isolation limit pin restricts the door lock plate from moving to the left side position to prevent the isolation operation hole from opening. When the nut is moved to the rear position, it pushes the grounding limit pin forward. At this time, the grounding limit pin restricts the door lock plate from moving to the right position to prevent the grounding operation hole from opening.

[0009] Furthermore, a pair of grounding auxiliary switches and a grounding locking lever are provided on the housing. The grounding locking lever is rotatably set at the front end of the housing, with one end abutting against the two grounding auxiliary switches and the other end connected to the isolation limit pin. When the isolation limit pin is pushed out by the nut, the isolation limit pin triggers the switching signal of two grounding auxiliary switches through the grounding locking lever, so as to de-energize and stop the motor.

[0010] Furthermore, a pair of isolation auxiliary switches and an isolation locking lever are provided on the housing. The isolation locking lever is rotatably set at the rear end of the housing, with one end abutting against the two isolation auxiliary switches and the other end engaging with a nut via a first screw. When the first screw is pushed back by the nut, the isolation locking lever triggers the switching signals of the two isolation auxiliary switches to de-energize and stop the motor.

[0011] Furthermore, a grounding limit lever is provided at the rear end of the housing. One end of the grounding limit lever is engaged with a nut via a second screw, and the other end of the grounding limit lever is connected to a grounding limit pin. A return spring is provided on the grounding limit pin, and the return spring drives the grounding limit pin to keep moving backward. When the nut is moved to the rear position, the nut abuts against the second screw, and the grounding limit lever drives the grounding limit pin to move forward.

[0012] Furthermore, the housing is provided with an intermediate locking lever and a pair of intermediate auxiliary switches, the nut is provided with an intermediate lever, the intermediate locking lever is rotatably mounted on the housing, the lower end of the intermediate locking lever abuts against the two intermediate auxiliary switches, and its upper end is adapted to slide with the intermediate lever. When the intermediate lever moves to the center position with the nut, it triggers the switching signals of the two intermediate auxiliary switches through the intermediate locking lever, so that the motor is powered off and stopped.

[0013] Furthermore, the housing is provided with a grounding handle interlocking mechanism and an isolation handle interlocking mechanism; The grounding handle interlocking mechanism includes a grounding lock plate, a second grounding lever, and a grounding lever block. The grounding lock plate moves elastically up and down at the front end of the housing and is located above the handle insertion section of the grounding operating shaft. The middle part of the second grounding lever is rotatably connected to the housing, and the grounding lever block is fixed to one side of the nut. When the nut drives the grounding lever block to move from the front-rear middle position to the front side position, the grounding lever block lifts the rear end of the second grounding lever, causing the front end of the second grounding lever to press down on the grounding lock plate, thereby inserting the lower end of the grounding lock plate into the annular groove of the operating handle to prevent the operating handle from being removed. When the nut reaches the front side position, the grounding lever block disengages from the second grounding lever, and the front end of the second grounding lever returns to its original position under the elastic force of the grounding lock plate, thereby causing the lower end of the grounding lock plate to leave the annular groove of the operating handle and unlocking the operating handle. The isolation handle interlocking mechanism includes an isolation lock plate, a second isolation lever, and an isolation block. The isolation lock plate moves elastically up and down at the front end of the housing and is located above the handle insertion section of the isolation operating shaft. The middle part of the second isolation lever is rotatably connected to the housing, and the isolation block is fixed on the other side of the nut. When the nut drives the isolation block to move from the front-rear middle position to the rear side position, the isolation block lifts the rear end of the second isolation lever, causing the front end of the second isolation lever to press down on the isolation lock plate, thereby inserting the lower end of the isolation lock plate into the annular groove of the operating handle to prevent the operating handle from being removed. When the nut reaches the rear position, the isolation block disengages from the second isolation lever, and the front end of the second isolation lever returns to its original position under the elastic force of the isolation lock plate, thereby causing the lower end of the isolation lock plate to leave the operating handle annular groove and the operating handle to unlock.

[0014] Furthermore, the front end of the housing is provided with an upper guide plate and a lower guide plate. The grounding lock plate and the isolation lock plate move up and down between the upper and lower guide plates. The lower ends of the grounding lock plate and the isolation lock plate pass through the lower guide plate and are adapted to be inserted into the annular groove of the operating handle. The upper ends of the grounding lock plate and the isolation lock plate pass through the upper guide plate and form a guide rod. A stop pin is provided on the guide rod. A large compression spring and a reset compression spring are sleeved on the guide rod. The reset compression spring 55 is located between the stop pin and the upper guide plate. The upper end of the large compression spring abuts against the front end of the lever, and the lower end abuts against the stop pin. The elastic force of the large compression spring is greater than that of the reset compression spring 55. The second grounding lever and the second isolation lever respectively apply downward pressure to the grounding lock plate and the isolation lock plate through the large compression spring. The reset compression spring 55 provides upward reset elastic force to the grounding lock plate and the isolation lock plate.

[0015] The second aspect: A method for operating a direct-acting three-position disconnect switch is provided, using the aforementioned direct-acting three-position disconnect switch with intermediate limit switch; Method for switching between disconnecting switch tripping and grounding: Grounding manual mode: Move the door lock plate to the right side, the grounding operation hole is opened, the right pressure plate drives the iron core of the grounding coil to be raised and unlocked through the first grounding lever, insert the operation handle to drive the grounding operation shaft to rotate, and drive the nut to move from the front and rear middle to the front side position. At this time, the disconnect switch is switched to the grounding state. Manual mode of tripping: Rotate the grounding operating shaft in the reverse direction to move the nut from the front to the middle position. When the nut stops moving when it comes into contact with the iron core of the isolation coil, remove the operating handle, move the door lock plate to the middle position, and the iron core of the grounding coil falls down. At this time, the nut in the middle position is restricted between the two iron cores, and the disconnecting switch is switched to the tripping state. Grounding electric mode: The control unit controls the grounding coil to be energized, lifting and unlocking the iron core of the grounding coil. The motor drives the grounding operating shaft to rotate through the gear, causing the nut to move to the front side. The nut pushes forward out of the isolation limit pin and drives the grounding locking lever to trigger the switching signals of the two grounding auxiliary switches, so that the motor is de-energized and stops. At this time, the nut moves to the front side and the isolation switch switches to the grounding state. Electric tripping mode: The motor drives the grounding operating shaft to rotate in the opposite direction, causing the nut to move towards the front-to-back middle position. The middle block on the nut abuts against the middle locking lever, thereby triggering the switching signals of the two middle auxiliary switches to de-energize and stop the motor. At this time, the nut is in the front-to-back middle position. Finally, the iron core of the grounding coil is lowered. At this time, the nut in the front-to-back middle position is restricted between the two iron cores, and the disconnecting switch is switched to the tripping state. Method for switching between opening and closing of a disconnecting switch: Manual closing mode: Move the door lock plate to the left side, open the isolation operation hole, and the left pressure plate drives the iron core of the isolation coil to lift and unlock through the first isolation lever. Insert the operating handle to drive the isolation operation shaft and the grounding operation shaft to rotate, and drive the nut to move from the front and rear middle to the rear side position. At this time, the isolation switch is switched to the closing state. Manual mode of tripping: Rotate the isolation operating shaft in the reverse direction, thereby driving the grounding operating shaft to rotate in the reverse direction, causing the nut to move from the rear position to the front-to-back middle position. When the nut stops moving after contacting the iron core of the grounding coil, remove the operating handle, and the door lock plate moves to the left-right middle position. The iron core of the isolation coil falls down. At this time, the nut in the front-to-back middle position is restricted between the two iron cores, and the disconnecting switch is switched to the tripping state. Electric closing mode: The control unit controls the isolation coil to be energized, which lifts and unlocks the iron core of the isolation coil. The motor drives the grounding operating shaft to rotate through the gear, which drives the nut to move to the rear side. The nut pushes out the first screw, triggering the switching signals of the two isolation auxiliary switches through the isolation locking lever, so that the motor is de-energized and stops. At this time, the nut moves to the rear side and the isolation switch switches to the closed state. Electric tripping mode: The motor drives the grounding operating shaft to rotate in the opposite direction, causing the nut to move towards the front-to-back center position. The center lever on the nut abuts against the center locking lever, thereby triggering the switching signals of the two center auxiliary switches to de-energize and stop the motor. At this time, the nut is in the front-to-back center position. Finally, the iron core of the control isolation coil falls down. At this time, the nut in the front-to-back center position is restricted between the two iron cores, and the isolating switch switches to the tripping state.

[0016] The beneficial effects of this utility model are: By using a grounding coil and an isolation coil installed on the housing, when the disconnecting switch is in the open position, the nut is in the middle position. At this time, the nut is restricted by the iron core of the two coils, ensuring that the disconnecting switch is stable in the open position.

[0017] By ensuring the precise positioning of the isolating electrical device during tripping, the lap joint of the moving and stationary contacts inside the external circuit breaker connected to it is ultimately ensured to be stable and reliable, thereby improving safety. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the direct-acting three-position disconnect switch (with panel) of this utility model; Figures 2 to 4 This is a schematic diagram of the direct-acting three-position disconnect switch of this utility model; Figure 5 It is a structural diagram of the grounding locking lever, nut, isolation locking lever, and grounding limit lever; Figures 6 to 8 This is a schematic diagram of the grounding handle interlocking mechanism and the isolating handle interlocking mechanism; Figure 9 This is a schematic diagram showing the nut being held in the middle position by two iron cores. Figure 10 This is a schematic diagram of inserting the operating handle into the disconnect switch; Among them, 1. Housing, 11. Front side panel, 12. Rear side panel, 13. Middle upper partition, 14. Middle lower partition, 15. Door lock plate, 151. Right pressure plate, 152. Left pressure plate, 153. Door hole; 16. Panel, 161. Grounding operation hole, 162. Isolation operation hole, 17. Operating handle, 18. Motor; 21. Grounding operating shaft; 22. Isolation operating shaft; 23. Nut; 24. Transition shaft; 31. Grounding coil; 32. Isolation coil; 33. First grounding lever; 34. First isolation lever; 3A. Iron core; 41. Grounding limit pin; 42. Grounding locking lever; 43. Isolation limit pin; 44. Isolation locking lever; 45. First screw; 46. Grounding limit lever; 47. Second screw. 5. Grounding handle interlocking mechanism, 51. Grounding lock plate, 511. Guide rod, 512. First baffle, 52. Second grounding lever, 53. Grounding lever, 54. Large compression spring, 55. Reset compression spring, 56. Upper guide plate, 57. Lower guide plate; 6. Isolation handle interlocking mechanism; 61. Isolation lock plate; 62. Second isolation lever; 63. Isolation lever; 71. Grounding auxiliary switch; 72. Isolation auxiliary switch; 73. Intermediate auxiliary switch; 81. Intermediate locking lever; 82. Intermediate lever; 91. Left micro switch; 92. Right micro switch; 93. First micro switch; 94. Second micro switch. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] This application provides a direct-acting three-position disconnect switch with an intermediate limit switch, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0022] To address the technical problem in the prior art where the isolating switch's isolation position is inaccurate when it is in the intermediate position (open position) due to the lack of a limit switch, one embodiment of this application provides a direct-acting three-position isolating switch with an intermediate limit switch. This is described in detail below.

[0023] like Figures 1 to 10 As shown, a direct-acting three-position disconnect switch with intermediate limit switch includes... The housing 1 contains a grounding operating shaft 21 and an isolation operating shaft 22, which rotate synchronously. The grounding operating shaft 21 is a lead screw, and the isolation operating shaft 22 is a smooth rod. Nut 23 is sleeved on the grounding operating shaft 21 and the isolating operating shaft 22. When the isolating switch is open, the grounding operating shaft 21 drives the nut 23 to the middle position. When the isolating switch is closed, the grounding operating shaft 21 drives the nut 23 to the rear position. When the isolating switch is grounded, the grounding operating shaft 21 drives the nut 23 to the front position. The grounding coil 31 and the isolation coil 32 are both mounted on the housing 1. When the nut 23 is in the front-to-back middle position, the iron cores 3A of the two coils block the front and back ends of the nut 23 respectively, thereby restricting the nut 23 to the front-to-back middle position. The core 3A of the grounding coil 31 is raised, and the grounding operation shaft 21 is rotated to move the nut 23 to the front position; the core 3A of the isolation coil 32 is raised, and the grounding operation shaft 21 is rotated to move the nut 23 to the rear position.

[0024] In this embodiment, the grounding coil 31 and the isolation coil 32 are latching coils, which are a type of relay and belong to the prior art. Their working principle will not be described in detail here.

[0025] When the locking coil is de-energized, its core 3A extends downward under its own weight, thereby restricting the nut 23 from moving back and forth. The lifting of the locking coil's core 3A is achieved by energizing the coil or by using a lever.

[0026] The rear end of the isolation operation shaft 22 is connected to a transition shaft 24, which is connected to an external three-position circuit breaker mechanism.

[0027] Specifically, as an optional implementation method in this embodiment, such as Figure 2 and Figure 4 As shown, the door lock plate 15 moves left and right on the front side of the housing 1, and the door lock plate 15 is provided with a right pressure plate 151 and a left pressure plate 152. The first grounding lever 33 and the first isolation lever 34 are rotatably connected on the housing 1. One end of the first grounding lever 33 is connected to the iron core 3A of the grounding coil 31, and one end of the first isolation lever 34 is connected to the iron core 3A of the isolation coil 32. When the door lock plate 15 is in the middle position, the door lock plate 15 blocks the grounding operation hole 161 and the isolation operation hole 162 on the panel 16. When the door lock plate 15 moves to the right side, the grounding operation hole 161 opens, and the first grounding lever 33 is pressed down by the right pressure plate 151, thereby driving the iron core 3A of the grounding coil 31 to lift and unlock. When the door lock plate 15 moves to the left side, the isolation operation hole 162 opens, and the first isolation lever 34 is pressed down by the left pressure plate 152, thereby driving the iron core 3A of the isolation coil 32 to lift and unlock.

[0028] The entire door lock plate 15 is made of sheet metal. The right pressure plate 151 and the left pressure plate 152 are formed by stamping and bending. Wedge-shaped inclined surfaces are formed on both the right pressure plate 151 and the left pressure plate 152, and they abut against the first grounding lever 33 and the first isolation lever 34 through the wedge-shaped inclined surfaces.

[0029] Traditional disconnect switches rely primarily on the electrical circuit to cut off the motor power supply to stop in the middle position. This traditional method requires a microswitch and lacks a mechanical limit switch, often resulting in electrical circuit malfunctions that prevent stopping. Now, by configuring two coils at the front and rear middle positions, in the event of an electrical circuit malfunction or microswitch failure, the coil core 3A provides a limit switch when the nut 23 moves to the front or rear middle position, ensuring precise and reliable stopping of the switch in the open position.

[0030] In this embodiment, in order to reduce the friction between the pressure plate and the lever, rollers are provided at the ends of the first grounding lever 33 and the first isolation lever 34. The right pressure plate 151 and the left pressure plate 152 respectively cooperate with the rollers on the lever through wedge-shaped inclined surfaces, so that the door lock plate 15 can drive the lever to rotate from left to right.

[0031] In this embodiment, the first grounding lever 33 and the first isolation lever 34 are respectively mounted on the housing 1 via supports.

[0032] Specifically, as an optional implementation method in this embodiment, such as Figures 1 to 9 As shown, the housing 1 is provided with an isolation limit pin 43 and a grounding limit pin 41. The isolation limit pin 43 and the grounding limit pin 41 are respectively located on the left and right sides of the door lock plate 15 and can move elastically back and forth on the housing 1. When nut 23 moves to the front position, nut 23 pushes the isolation limit pin 43 forward. At this time, the isolation limit pin 43 restricts the door lock plate 15 from moving to the left side position to prevent the isolation operation hole 162 from opening. When nut 23 moves to the rear position, nut 23 pushes the grounding limit pin 41 forward. At this time, the grounding limit pin 41 restricts the door lock plate 15 from moving to the right position to prevent the grounding operation hole 161 from opening.

[0033] In this embodiment, as an implementation method for the elastic movement of the isolation limit pin 43 and the ground limit pin 41, a spring is sleeved on the isolation limit pin 43 and the ground limit pin 41. Under the action of the spring, the front ends of the isolation limit pin 43 and the ground limit pin 41 are retracted inside the housing 1, and only extend outward when they abut against the nut 23.

[0034] The isolation limit pin 43 and the grounding limit pin 41 are mainly used to prevent the disconnecting switch from being misoperated when it is in the grounding or closed state. When the disconnecting switch is in the grounding state, i.e., the nut 23 is in the front position, it is necessary to ensure that the door lock plate 15 can only move to the right, that is, only the grounding operation hole 161 can be opened for grounding tripping operation. At this time, the isolation limit pin 43 blocks the door lock plate 15 from moving to the left, thus restricting the opening of the isolation operation hole 162 and preventing the worker from performing isolation operation. Similarly, when the disconnecting switch is in the closed state, the nut 23 is in the rear position. At this time, the disconnecting switch can only perform isolation tripping operation and cannot perform grounding operation, that is, only the isolation operation hole 162 can be opened, and the isolation operation shaft 22 can be rotated by inserting the operating handle 17 to achieve isolation tripping operation. Now, the grounding limit pin 41 blocks the door lock plate 15 from moving to the right, preventing the grounding operation hole 161 from opening and preventing the switch from performing grounding operation when closed.

[0035] Specifically, as an optional implementation method in this embodiment, such as Figures 1 to 9As shown, a pair of grounding auxiliary switches 71 and a grounding locking lever 42 are provided on the housing 1. The grounding locking lever 42 is rotatably set at the front end of the housing 1, with one end abutting against the two grounding auxiliary switches 71 and the other end connected to the isolation limit pin 43. When the isolation limit pin 43 is pushed out by the nut 23, the isolation limit pin 43 triggers the switching signal of the two grounding auxiliary switches 71 through the grounding locking lever 42, so that the motor 18 is de-energized and stopped.

[0036] In this embodiment, the isolation limit pin 43 is a bolt. The rear end of the bolt passes through the grounding locking lever 42. The grounding locking lever 42 is adapted to abut against the nut 23. By rotating the bolt, the front and rear positions of the bolt on the housing 1 can be adjusted so that it can accurately prevent the door lock plate 15 from moving to the left.

[0037] The left end of the grounding locking lever 42 abuts against the contact rods of the two grounding auxiliary switches 71. The contact rods elastically extend and retract, and the elastic force of the contact rods can keep the isolation limit pin 43 moving backward. When the nut 23 is displaced from the front, the isolation limit pin 43 can automatically move backward.

[0038] In this embodiment, when the nut 23 moves to the front position, i.e. the isolating switch is grounded, the nut 23 pushes out the grounding locking lever 42, which restricts the door lock plate 15 from moving to the left and also triggers the grounding auxiliary switch 71, so that the switch controls the motor 18 to stop working in electric mode.

[0039] Specifically, as an optional implementation method in this embodiment, such as Figures 1 to 9 As shown, a pair of isolation auxiliary switches 72 and an isolation locking lever 44 are provided on the housing 1. The isolation locking lever 44 is rotatably set at the rear end of the housing 1. One end of the lever abuts against the two isolation auxiliary switches 72, and the other end of the lever engages with the nut 23 through the first screw 45. When the first screw 45 is pushed back by the nut 23, the isolation locking lever 44 triggers the switching signals of the two isolation auxiliary switches 72 to de-energize and stop the motor 18.

[0040] In this embodiment, the isolation auxiliary switch 72 is suitable for the isolation switch in electric mode. When the motor 18 controls the nut 23 to move to the rear position, the isolation auxiliary switch 72 is triggered by the first screw 45 and the isolation locking lever 44, thereby stopping the motor 18 and keeping the nut 23 in the rear position, that is, the isolation switch is closed.

[0041] Specifically, as an optional implementation method in this embodiment, such as Figure 3 and Figure 5As shown, a grounding limit lever 46 is provided at the rear end of the housing 1. One end of the grounding limit lever 46 is engaged with the nut 23 through the second screw 47, and the other end of the grounding limit lever 46 is connected to the grounding limit pin 41. A return spring is provided on the grounding limit pin 41, and the return spring drives the grounding limit pin 41 to keep moving backward. When nut 23 moves to the rear position, nut 23 abuts against the second screw 47, and the grounding limit lever 46 drives the grounding limit pin 41 to move forward.

[0042] In this embodiment, the grounding limit pin 41 penetrates the housing 1 in the front-to-back direction. The nut 23 moves to the rear position and triggers the grounding limit pin 41 to move forward through the second screw 47 and the grounding limit lever 46. This allows the grounding limit pin 41 to extend forward when the nut 23 is in the rear position, restricting the door lock plate 15 from moving to the right, that is, restricting the grounding operation hole 161 from opening.

[0043] Specifically, as an optional implementation method in this embodiment, such as Figures 1 to 9 As shown, the housing 1 is provided with an intermediate locking lever 81 and a pair of intermediate auxiliary switches 73, the nut 23 is provided with an intermediate toggle block 82, the intermediate locking lever 81 is rotatably mounted on the housing 1, the lower end of the intermediate locking lever 81 abuts against the two intermediate auxiliary switches 73, and its upper end is adapted to slide with the intermediate toggle block 82. When the intermediate lever 82 moves to the front-to-back middle position with the nut 23, the intermediate lever 82 triggers the switching signals of the two intermediate auxiliary switches 73 through the intermediate locking lever 81, so that the motor 18 is de-energized and stopped.

[0044] In this embodiment, guide ramps are provided on the front and rear sides of the intermediate lever 82, which cooperate with the upper end of the intermediate locking lever 81 through the guide. In order to reduce the friction between the intermediate lever 82 and the intermediate locking lever 81, a roller is provided on the upper end of the intermediate locking lever 81. The intermediate locking lever 81 cooperates with the intermediate lever 82 through the roller, thereby reducing the resistance when the intermediate lever 82 passes through the intermediate locking lever 81.

[0045] Specifically, as an optional implementation method in this embodiment, such as Figures 1 to 9 As shown, the housing 1 includes a front side plate 11, a rear side plate 12, an upper middle partition 13, and a lower middle partition 14, and the grounding operation shaft 21 and the isolation operation shaft 22 are installed between the front side plate 11 and the rear side plate 12.

[0046] The grounding operation shaft 21 and the isolation operation shaft 22 are located between the upper intermediate partition 13 and the lower intermediate partition 14.

[0047] The grounding coil 31, the isolation coil 32, the first grounding lever 33 and the first isolation lever 34 are all installed on the upper middle partition 13, and the middle locking lever 81 is installed on the lower middle partition 14.

[0048] The front ends of both the grounding operating shaft 21 and the isolation operating shaft 22 extend from the front side plate 11. The extended section serves as a plug-in section for connecting the operating handle 17, and the plug-in section has a hexagonal structure.

[0049] A first gear is provided on the grounding operation shaft 21, a second gear is provided on the isolation operation shaft 22, and the motor 18 is connected to the third gear through a clutch. The first gear meshes with the second gear and the third gear respectively, and the clutch ensures that the motor 18 can drive the third gear to rotate in one direction.

[0050] The door lock plate 15 is installed on the front side of the front side plate 11 and can move left and right on the front side plate 11. The door lock plate 15 has a door hole 153 in the middle. The front side of the door lock plate 15 is the panel 16 of the disconnect switch. The relative position between the panel 16 and the housing 1 is fixed. The panel 16 has a grounding operation hole 161 and an isolation operation hole 162. When the door lock plate 15 is in the middle position, the door lock plate 15 blocks the grounding operation hole 161 and the isolation operation hole 162. When the door lock plate 15 moves to the right position, the door hole 153 of the door lock plate 15 connects to the grounding operation hole 161 and the grounding operation shaft 21. At this time, the operating handle 17 can be inserted to perform the grounding operation. When the door lock plate 15 moves to the left position, the door hole 153 of the door lock plate 15 connects to the isolation operation shaft 22 of the isolation operation hole 162. At this time, the operating handle 17 can be inserted to perform the isolation operation.

[0051] In this embodiment, a right micro switch 92 and a left micro switch 91 are respectively provided on both sides of the door lock plate 15. When the door lock plate 15 is moved to the left or right position, the left micro switch 91 or the right micro switch 92 are triggered respectively. At this time, the isolating switch is in manual mode, the electric mode is off, and the motor 18 is in a power-off state.

[0052] Specifically, as an optional implementation method in this embodiment, such as Figures 6 to 8 As shown, the housing 1 is provided with a grounding handle interlocking mechanism 5 and an isolation handle interlocking mechanism 6; The grounding handle interlocking mechanism 5 includes a grounding lock plate 51, a second grounding lever 52, and a grounding block 53. The grounding lock plate 51 moves elastically up and down at the front end of the housing 1. The grounding lock plate 51 is located above the handle insertion section of the grounding operating shaft 21. The middle part of the second grounding lever 52 is rotatably connected to the housing 1. The grounding block 53 is fixed to one side of the nut 23. When the nut 23 drives the grounding block 53 to move from the front-rear middle position to the front side position, the grounding block 53 lifts the rear end of the second grounding lever 52, driving the front end of the second grounding lever 52 to press down on the grounding lock plate 51, so that the lower end of the grounding lock plate 51 is inserted into the annular groove of the operating handle 17 to prevent the operating handle 17 from being removed. When the nut 23 reaches the front side position, the grounding block 53 disengages from the second grounding lever 52. The front end of the second grounding lever 52 returns to its original position under the elastic force of the grounding lock plate 51, so that the lower end of the grounding lock plate 51 leaves the annular groove of the operating handle 17, and the operating handle 17 is unlocked. The isolation handle interlocking mechanism 6 includes an isolation locking plate 61, a second isolation lever 62, and an isolation block 63. The isolation locking plate 61 moves elastically up and down at the front end of the housing 1. The isolation locking plate 61 is located above the handle insertion section of the isolation operating shaft 22. The middle part of the second isolation lever 62 is rotatably connected to the housing 1. The isolation block 63 is fixed on the other side of the nut 23. When the nut 23 drives the isolation block 63 to move from the front-rear middle position to the rear side position, the isolation block 63 lifts the rear end of the second isolation lever 62, driving the front end of the second isolation lever 62 to press down on the isolation locking plate 61, thereby inserting the lower end of the isolation locking plate 61 into the annular groove of the operating handle 17 to prevent the operating handle 17 from being removed. When the nut 23 reaches the rear position, the isolation block 63 disengages from the second isolation lever 62, and the front end of the second isolation lever 62 returns to its original position under the elastic force of the isolation locking plate 61, thereby causing the lower end of the isolation locking plate 61 to leave the annular groove of the operating handle 17, and the operating handle 17 is unlocked.

[0053] Specifically, as an optional implementation method in this embodiment, such as Figures 6 to 8 As shown, the front end of the housing 1 is provided with an upper guide plate 56 and a lower guide plate 57. The grounding lock plate 51 and the isolation lock plate 61 move up and down between the upper guide plate 56 and the lower guide plate 57. The lower ends of the grounding lock plate 51 and the isolation lock plate 61 pass through the lower guide plate 57 and are adapted to be inserted into the annular groove of the operating handle 17.

[0054] There are two upper guide plates 56 and one lower guide plate 57. The grounding lock plate 51 and the isolation lock plate 61 share one lower guide plate 57.

[0055] The grounding lock plate 51 and the isolation lock plate 61 have the same structure. Taking the grounding lock plate 51 as an example: the upper end of the grounding lock plate 51 passes through the upper guide plate 56 and forms a guide rod 511. A stop pin is provided on the guide rod 511. A large compression spring 54 and a reset compression spring 55 are sleeved on the guide rod 511. The reset compression spring 55 is located between the stop pin and the upper guide plate 56. The upper end of the large compression spring 54 abuts against the front end of the lever, and the lower end abuts against the stop pin. The elastic force of the large compression spring 54 is greater than that of the reset compression spring 55. The second grounding lever 52 applies downward pressure to the grounding lock plate 51 and the isolation lock plate 61 through the large compression spring 54. The reset compression spring 55 provides an upward reset elastic force to the grounding lock plate 51.

[0056] Grounding block 53 and isolation block 63 have the same structure, see [link / reference] Figure 5 As shown, the front and rear ends of the lever are guide ramps, and the upper end of the lever is a plane. When the lever is engaged with the lever, the lever end first slides onto the plane through the guide ramp. The length of the plane corresponds to the length of the nut 23 between adjacent workstations, ensuring that the nut 23 is always in the state of pressing the locking plate during the stroke.

[0057] In actual operation, the operating handle 17 needs to rotate the grounding operating shaft 21 one to one and a half turns before the lever end can slide from the guide slope to the plane of the lever block.

[0058] Specifically, as an optional implementation method in this embodiment, such as Figures 6 to 8 As shown, a first micro switch 93 and a second micro switch 94 are provided on the lower guide plate 57; When the grounding lock plate 51 moves to the lower position, the first micro switch 93 is triggered; when the isolation lock plate 61 moves to the lower position, the second micro switch 94 is triggered.

[0059] In this embodiment, the two microswitches are mainly used in electric mode. When the motor 18 drives the nut 23 to move halfway through its travel and power is cut off, the specific locking plate that is pressed down can be determined by observing which microswitch is triggered, thus indicating the switch's state. If the first microswitch 93 is triggered, it means the grounding locking plate 51 is pressed down, indicating that the nut 23 is in the grounding travel between the front-to-back middle position and the front side position. If the second microswitch 94 is triggered, it means the isolation locking plate 61 is pressed down, indicating that the nut 23 is in the isolation travel between the front-to-back middle position and the rear side position.

[0060] In this embodiment, a first baffle 512 is provided on the grounding lock plate 51. When the grounding lock plate 51 moves to the lower position, the first baffle 512 restricts the door lock plate 15 from moving to the left side position. A second baffle is provided on the isolation lock plate 61. When the isolation lock plate 61 moves to the lower position, the second baffle restricts the door lock plate 15 from moving to the right side position.

[0061] Working principle of grounding handle interlocking mechanism 5: When the disconnecting switch is grounded: the grounding operating shaft 21 drives the nut 23 to move from the front-to-back middle position to the front side position. The nut 23 drives the front guide slope of the grounding block 53 to start to abut against the rear end of the second grounding lever 52, thereby causing the front end of the second grounding lever 52 to press down the grounding lock plate 51, so that the lower end of the grounding lock plate 51 is inserted into the annular groove of the operating handle 17. As the nut 23 moves to the front side position, the entire grounding block 53 leaves the second grounding lever 52. At this time, the front end of the second grounding lever 52 resets and rises, thereby causing the grounding lock plate 51 to move upward away from the annular groove of the operating handle 17. Only then can the operating handle 17 be removed. When the disconnecting switch is tripped: the grounding operating shaft 21 drives the nut 23 to move from the front side position to the front-to-back middle position. The nut 23 drives the rear end of the grounding block 53 to abut against the rear end of the second grounding lever 52, thereby causing the front end of the second grounding lever 52 to press down the grounding locking plate 51, so that the lower end of the grounding locking plate 51 is inserted into the annular groove of the operating handle 17. As the nut 23 moves to the front-to-back middle position, the entire grounding block 53 leaves the second grounding lever 52. At this time, the front end of the second grounding lever 52 resets and rises, thereby causing the grounding locking plate 51 to move upward away from the annular groove of the operating handle 17. Only then can the operating handle 17 be removed. In electric mode, the grounding operation shaft 21 is rotated by the motor 18. When the grounding lock plate 51 moves down, it triggers the first micro switch 93, and at this time, it can be known that the switch is performing a grounding action.

[0062] Working principle of the isolating handle interlocking mechanism 6: When the isolating switch is closed: the grounding operating shaft 21 drives the nut 23 to move from the front-to-back middle position to the rear side position. The nut 23 drives the rear end of the isolating block 63 to start to abut against the rear end of the second isolating lever 62, thereby causing the front end of the second isolating lever 62 to press down the isolating locking plate 61, so that the lower end of the isolating locking plate 61 is inserted into the annular groove of the operating handle 17. As the nut 23 moves to the rear side position, the entire isolating block 63 leaves the second isolating lever 62. At this time, the front end of the second isolating lever 62 resets and rises, thereby causing the isolating locking plate 61 to move upward away from the annular groove of the operating handle 17. Only then can the operating handle 17 be removed. When the disconnecting switch is tripped: the grounding operating shaft 21 drives the nut 23 to move from the rear position to the front-to-back middle position. The nut 23 drives the front end of the disconnecting block 63 to abut against the rear end of the second disconnecting lever 62, thereby causing the front end of the second disconnecting lever 62 to press down the disconnecting locking plate 61, so that the lower end of the disconnecting locking plate 61 is inserted into the annular groove of the operating handle 17. As the nut 23 moves to the front-to-back middle position, the entire disconnecting block 63 leaves the second disconnecting lever 62. At this time, the front end of the second disconnecting lever 62 resets and rises, thereby causing the disconnecting locking plate 61 to move upward away from the annular groove of the operating handle 17. Only then can the operating handle 17 be removed.

[0063] The interlocking mechanism mainly serves three functions: First: When operating manually, the grounding block 53 or the isolation block 63 drives the corresponding locking plate to be inserted into the annular groove of the operating handle 17 to prevent the handle from being pulled out even when the switch is not in position.

[0064] Second: During electric operation, the micro switch that is engaged with the locking plate presses down uses contact switching to give a clear position signal of the isolating switch (for example, if the power suddenly stops halfway through the electric operation, after the power is restored, the electrical circuit can clearly determine the state position of the switch because of the signal conversion of the micro switch on the ground side, providing a basis for subsequent electric operation judgment).

[0065] Third: The baffle on the lock plate can control the opening direction of the door lock plate 15. When the electric operation is halfway through and manual operation is required for some reason, the baffle can limit the opening and ensure that the door lock plate 15 can only open in one correct direction, thereby avoiding accidents caused by misoperation.

[0066] A method for operating a direct-acting three-position disconnect switch, using the aforementioned direct-acting three-position disconnect switch with intermediate limit; Method for switching between disconnecting switch tripping and grounding: Grounding manual mode: Move the door lock plate 15 to the right side position, open the grounding operation hole 161, and the right pressure plate 151 drives the iron core 3A of the grounding coil 31 to lift and unlock through the first grounding lever 52. Insert the operation handle 17 to drive the grounding operation shaft 21 to rotate, and drive the nut 23 to move from the front and rear middle to the front side position. At this time, the disconnect switch is switched to the grounding state. When nut 23 moves to the front position, nut 23 pushes the grounding limit pin 41 forward. At this time, the grounding limit pin 41 restricts the door lock plate 15 from moving to the left, preventing the isolation operation hole 162 from opening, thus playing a foolproof role.

[0067] Manual tripping mode: Rotate the grounding operating shaft 21 in the reverse direction to rotate, causing the nut 23 to move from the front side to the front-to-back middle position. When the nut 23 comes into contact with the iron core 3A of the isolation coil 32 and stops moving, remove the operating handle 17, move the door lock plate 15 to the left-right middle position, and the iron core 3A of the grounding coil 31 falls down. At this time, the nut 23, which is in the front-to-back middle position, is restricted between the two iron cores 3A, and the disconnecting switch is switched to the tripping state. Grounding electric mode: The control unit controls the grounding coil 31 to be energized, lifting and unlocking the iron core 3A of the grounding coil 31. The motor 18 drives the grounding operation shaft 21 to rotate through the gear, causing the nut 23 to move to the front side position. The nut 23 pushes forward the isolation limit pin 43 and drives the grounding locking lever 42 to trigger the switching signal of the two grounding auxiliary switches 71, so that the motor 18 is de-energized and stops. At this time, the nut 23 moves to the front side position, and the isolation switch switches to the grounding state. Electric tripping mode: Motor 18 drives the grounding operating shaft 21 to rotate in the opposite direction, causing the nut 23 to move towards the front-to-back middle position. The toggle block on the nut 23 abuts against the middle locking lever 81, thereby triggering the switching signals of the two intermediate auxiliary switches 73 to de-energize and stop the motor 18. At this time, the nut 23 is in the front-to-back middle position. Finally, the iron core 3A of the grounding coil 31 is controlled to fall. At this time, the nut 23, which is in the front-to-back middle position, is restricted between the two iron cores 3A, and the disconnecting switch is switched to the tripping state. Method for switching between opening and closing of a disconnecting switch: Manual closing mode: Move the door lock plate 15 to the left side position, open the isolation operation hole 162, and the left pressure plate 152 drives the iron core 3A of the isolation coil 32 to be raised and unlocked through the first isolation lever 34. Insert the operation handle 17 to drive the isolation operation shaft 22 and the grounding operation shaft 21 to rotate, and drive the nut 23 to move from the front and rear middle to the rear side position. At this time, the isolation switch is switched to the closing state. The isolation operating shaft 22 is a smooth rod, which serves as a guide. The isolation operating shaft 22 drives the grounding operating shaft 21 to rotate through gears. The grounding operating shaft 21 is a lead screw, which in turn drives the nut 23 to move back and forth.

[0068] When nut 23 moves to the rear position, nut 23 pushes the second screw 47 backward and drives the grounding limit lever 46 to rotate. The grounding limit lever 46 drives the grounding limit pin 41 to extend forward. The grounding limit pin 41 blocks the door lock plate 15 from moving to the right, thus restricting the grounding operation hole 161 from opening.

[0069] Manual tripping mode: Rotate the isolation operating shaft 22 in the reverse direction, thereby driving the grounding operating shaft 21 to rotate in the reverse direction, causing the nut 23 to move from the rear position to the front-to-back middle position. When the nut 23 stops moving when it comes into contact with the iron core 3A of the grounding coil 31, remove the operating handle 17, move the door lock plate 15 to the left-right middle position, and the iron core 3A of the isolation coil 32 falls down. At this time, the nut 23, which is in the front-to-back middle position, is restricted between the two iron cores 3A, and the disconnecting switch is switched to the tripping state. Electric closing mode: The control unit controls the isolation coil 32 to be energized, lifting and unlocking the iron core 3A of the isolation coil 32. The motor 18 drives the grounding operating shaft 21 to rotate through the gear, causing the nut 23 to move to the rear side position. The nut 23 pushes out the first screw 45, triggering the switching signal of the two isolation auxiliary switches 72 through the isolation locking lever 44, so that the motor 18 is de-energized and stopped. At this time, the nut 23 moves to the rear side position, and the isolation switch switches to the closing state. Electric tripping mode: Motor 18 drives the grounding operating shaft 21 to rotate in the opposite direction, causing nut 23 to move towards the front-to-back middle position. The middle toggle block 82 on nut 23 abuts against the middle locking lever 81, thereby triggering the switching signals of the two middle auxiliary switches 73 to de-energize and stop motor 18. At this time, nut 23 is in the front-to-back middle position. Finally, the iron core 3A of the control isolation coil 32 falls. At this time, nut 23, which is in the front-to-back middle position, is restricted between the two iron cores 3A, and the isolation switch switches to the tripping state.

[0070] The direct-acting three-position disconnect switch of this utility model has two coils arranged at the front and rear middle positions of the housing 1. When the switch is in the open position, the nut 23 is in the front and rear middle positions, and the iron core 3A of the two coils limits the nut 23, so that the disconnect switch is accurately and reliably positioned when it is open.

[0071] The lifting and lowering of the two coil cores 3A are linked to the left and right movement of the door lock plate 15. When the door lock plate 15 moves to the right to perform a grounding operation, the core 3A of the grounding coil 31 is automatically unlocked. When the door lock plate 15 moves to the left to perform an isolation operation, the core 3A of the isolation coil 32 is automatically unlocked.

[0072] All the devices selected in this application (parts whose specific structures are not specified) are general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0073] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0074] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0075] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0076] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0077] In addition, in the various embodiments of this utility model, each functional unit can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0078] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A direct-acting three-position disconnect switch with intermediate limit, characterized in that, include The housing contains a grounding operating shaft and an isolation operating shaft, which rotate synchronously. The grounding operating shaft is a lead screw, and the isolation operating shaft is a smooth rod. The nut is fitted onto the grounding operating shaft and the isolating operating shaft. When the isolating switch is open, the grounding operating shaft moves the nut to the middle position. When the isolating switch is closed, the grounding operating shaft moves the nut to the rear position. When the isolating switch is grounded, the grounding operating shaft moves the nut to the front position. The grounding coil and the isolation coil are both mounted on the housing. When the nut is in the front-to-back middle position, the iron cores of the two coils block the front and back ends of the nut respectively, thereby restricting the nut to the front-to-back middle position. The core of the grounding coil is raised, and the rotating grounding operating shaft is adapted to move the nut to the front position; the core of the isolation coil is raised, and the rotating grounding operating shaft is adapted to move the nut to the rear position.

2. The direct-acting three-position disconnector with intermediate limit switch according to claim 1, characterized in that, It also includes a door lock plate, which moves left and right on the front side of the housing, and a right pressure plate and a left pressure plate are provided on the door lock plate; The first grounding lever and the first isolation lever are rotatably connected on the housing. One end of the first grounding lever is connected to the iron core of the grounding coil, and one end of the first isolation lever is connected to the iron core of the isolation coil. When the door lock plate is in the middle position, the door lock plate blocks the grounding operation hole and the isolation operation hole on the panel. When the door lock plate moves to the right side, the grounding operation hole opens, and the first grounding lever is pressed down by the right pressure plate, thereby causing the iron core of the grounding coil to rise and unlock. When the door lock plate moves to the left side, the isolation operation hole opens, and the first isolation lever is pressed down by the left pressure plate, thereby driving the iron core of the isolation coil to rise and unlock.

3. The direct-acting three-position disconnector with intermediate limit switch according to claim 2, characterized in that, The housing is provided with an isolation limit pin and a grounding limit pin. The isolation limit pin and the grounding limit pin are respectively located on the left and right sides of the door lock plate and can move elastically back and forth on the housing. When the nut moves to the front position, it pushes the isolation limit pin forward. At this time, the isolation limit pin restricts the door lock plate from moving to the left side position to prevent the isolation operation hole from opening. When the nut is moved to the rear position, it pushes the grounding limit pin forward. At this time, the grounding limit pin restricts the door lock plate from moving to the right position to prevent the grounding operation hole from opening.

4. The direct-acting three-position disconnector with intermediate limit switch according to claim 3, characterized in that, The housing is provided with a pair of grounding auxiliary switches and a grounding locking lever. The grounding locking lever is rotatably set at the front end of the housing, with one end abutting against the two grounding auxiliary switches and the other end connected to the isolation limit pin. When the isolation limit pin is pushed out by the nut, the isolation limit pin triggers the switching signal of two grounding auxiliary switches through the grounding locking lever, so as to de-energize and stop the motor.

5. The direct-acting three-position disconnector with intermediate limit switch according to claim 3, characterized in that, The housing is provided with a pair of isolation auxiliary switches and an isolation locking lever. The isolation locking lever is rotatably set at the rear end of the housing. One end of the lever abuts against the two isolation auxiliary switches, and the other end is engaged with a nut by a first screw. When the first screw is pushed back by the nut, the isolation locking lever triggers the switching signals of the two isolation auxiliary switches to de-energize and stop the motor.

6. The direct-acting three-position disconnector with intermediate limit switch according to claim 3, characterized in that, A grounding limit lever is provided at the rear end of the housing. One end of the grounding limit lever is engaged with a nut via a second screw, and the other end of the grounding limit lever is connected to a grounding limit pin. A return spring is provided on the grounding limit pin, and the return spring drives the grounding limit pin to keep moving backward. When the nut is moved to the rear position, the nut abuts against the second screw, and the grounding limit lever drives the grounding limit pin to move forward.

7. The direct-acting three-position disconnector with intermediate limit switch according to claim 3, characterized in that, The housing is provided with a central locking lever and a pair of central auxiliary switches. The nut is provided with a central lever. The central locking lever is rotatably mounted on the housing. The lower end of the central locking lever abuts against the two central auxiliary switches, and its upper end is adapted to slide with the central lever. When the intermediate lever moves to the center position with the nut, it triggers the switching signals of the two intermediate auxiliary switches through the intermediate locking lever, so that the motor is powered off and stopped.

8. The direct-acting three-position disconnector with intermediate limit switch according to claim 1, characterized in that, The housing is provided with a grounding handle interlocking mechanism and an isolation handle interlocking mechanism; The grounding handle interlocking mechanism includes a grounding lock plate, a second grounding lever, and a grounding block. The grounding lock plate moves elastically up and down at the front end of the housing and is located above the handle insertion section of the grounding operating shaft. The middle part of the second grounding lever is rotatably connected to the housing, and the grounding block is fixed to one side of the nut. When the nut drives the grounding block to move from the front-rear middle position to the front side position, the grounding block lifts the rear end of the second grounding lever, causing the front end of the second grounding lever to press down on the grounding lock plate, thereby inserting the lower end of the grounding lock plate into the annular groove of the operating handle to prevent the operating handle from being removed. When the nut reaches the front position, the grounding block disengages from the second grounding lever, and the front end of the second grounding lever returns upward under the elastic force of the grounding lock plate, thereby causing the lower end of the grounding lock plate to leave the operating handle annular groove and the operating handle to unlock. The isolation handle interlocking mechanism includes an isolation lock plate, a second isolation lever, and an isolation block. The isolation lock plate moves elastically up and down at the front end of the housing and is located above the handle insertion section of the isolation operating shaft. The middle part of the second isolation lever is rotatably connected to the housing, and the isolation block is fixed on the other side of the nut. When the nut drives the isolation block to move from the front-rear middle position to the rear side position, the isolation block lifts the rear end of the second isolation lever, causing the front end of the second isolation lever to press down on the isolation lock plate, thereby inserting the lower end of the isolation lock plate into the annular groove of the operating handle to prevent the operating handle from being removed. When the nut reaches the rear position, the isolation block disengages from the second isolation lever, and the front end of the second isolation lever returns to its original position under the elastic force of the isolation lock plate, thereby causing the lower end of the isolation lock plate to leave the operating handle annular groove and the operating handle to unlock.

9. The direct-acting three-position disconnector with intermediate limit switch according to claim 8, characterized in that, The front end of the housing is provided with an upper guide plate and a lower guide plate. The grounding lock plate and the isolation lock plate move up and down between the upper and lower guide plates. The lower ends of the grounding lock plate and the isolation lock plate pass through the lower guide plate and are adapted to be inserted into the annular groove of the operating handle. The upper ends of the grounding lock plate and the isolation lock plate pass through the upper guide plate and form a guide rod. A stop pin is provided on the guide rod. A large compression spring and a return compression spring are sleeved on the guide rod. The return compression spring is located between the stop pin and the upper guide plate. The upper end of the large compression spring abuts against the front end of the lever, and the lower end abuts against the stop pin. The elastic force of the large compression spring is greater than that of the return compression spring. The second grounding lever and the second isolation lever respectively apply downward pressure to the grounding lock plate and the isolation lock plate through the large compression spring. The return compression spring provides an upward return elastic force to the grounding lock plate and the isolation lock plate.

Images