Direct-acting three-position disconnecting switch with interlocking protection

Abstract

The utility model relates to a kind of direct-acting three-position isolator with interlock protection, including shell, isolation operation shaft and ground operation shaft are arranged in the shell;Nut is located in shell and is sleeved on ground operation shaft and isolation operation shaft;Ground handle interlock mechanism, when nut is separated from front-back middle position, ground handle interlock mechanism is triggered, so that ground handle interlock mechanism locks ground operation handle, when nut reaches front side position, ground handle interlock mechanism unlocks ground operation handle;Isolation handle interlock mechanism, when nut is separated from front-back middle position, isolation handle interlock mechanism is triggered, so that isolation handle interlock mechanism locks isolation operation handle, when nut reaches rear side position, isolation handle interlock mechanism unlocks isolation operation handle.By ground dial block or isolation dial block drive corresponding lock plate is inserted into the ring groove of operation handle, prevent handle to be pulled out without being in place.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment, specifically to a direct-acting three-position disconnect switch with interlocking protection. 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 required reliability is also getting higher and higher. Three positions refer to three positions, namely the closed position, the open position (also known as the intermediate position), and the connection position.

[0003] Currently, dual-hole operated three-position disconnect switches on the market have the following defects in actual use: When the disconnect switch is in the open position, the lead screw nut is in the middle position. If grounding or isolation operations are required, the lead screw needs to move the lead screw nut towards the grounding or isolation position. For manual operation, an operating handle needs to be inserted to rotate the lead screw. However, the operating handle cannot be pulled out during manual operation; it can only be pulled out when the lead screw nut is moved to the grounding position. If the handle is pulled out halfway through operation, it can easily cause misoperation. Current disconnect switches lack the protection that the operating handle must be fully engaged before it can be pulled out. Secondly, in electrically operated mode, if a power outage occurs when the motor moves the lead screw nut halfway towards the grounding or isolation position, the switch's position cannot be directly determined after power is restored, lacking a basis for judgment. Finally, if manual operation is required halfway through electrically operated mode, it cannot be guaranteed that the door lock plate can only open in one direction, easily leading to misoperation.

[0004] In summary, the current three-station isolation mechanism lacks clear protective or foolproof measures during electric or manual operation, which can easily lead to subsequent misoperation and, in severe cases, safety accidents that could endanger personal safety. 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 interlocking protection. This solves the technical problem that the current three-position disconnect mechanism does not have clear protection or foolproof measures during electric or manual operation, which can easily lead to subsequent misoperation and, in serious cases, safety accidents that affect personal safety.

[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 interlocking protection is provided, including... The housing contains an isolation operating shaft and a grounding operating shaft, which rotate synchronously. The grounding operating shaft is a lead screw, and the isolation operating shaft is a smooth rod. The front ends of both the grounding operating shaft and the isolation operating shaft extend out of the housing and form a handle insertion section. The nut is located inside the housing and is fitted onto the grounding operating shaft and the isolating operating shaft. 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; when the isolating switch is opened, the grounding operating shaft moves the nut to the middle position. When the nut moves from the front-to-back center position to the front-side position, the grounding handle interlocking mechanism is triggered when the nut is disengaged from the front-to-back center position. This triggers the grounding handle interlocking mechanism to lock the grounding operating handle, thereby preventing the grounding operating handle from being pulled out of the handle plug section. When the nut reaches the front-side position, the grounding handle interlocking mechanism unlocks the grounding operating handle. When the nut moves from the front-to-back center position to the rear position, the isolation handle interlocking mechanism is triggered when the nut disengages from the front-to-back center position. This locks the isolation handle, preventing it from being pulled out of the handle insertion section. When the nut reaches the rear position, the isolation handle interlocking mechanism unlocks the isolation handle.

[0007] Furthermore, both the grounding handle interlocking mechanism and the isolation handle interlocking mechanism include A locking plate is located at the front end of the housing and above the handle insertion section; the locking plate can move up and down elastically. A lever, which is designed to rotate on the housing; A lever, which is mounted on the nut; When the nut moves the lever away from the center position, the lever lifts the rear end of the lever, causing the front end of the lever to press down on the locking plate, so that the lower end of the locking plate is inserted into the annular groove of the operating handle to prevent the operating handle from being removed. When the nut reaches the front or rear position, the lever disengages from the lever, and the front end of the lever returns to its original position under the action of the locking plate's elasticity, thereby causing the lower end of the locking plate to leave the operating handle's annular groove, and the operating handle to unlock.

[0008] Furthermore, the front end of the housing is provided with an upper guide plate and a lower guide plate. The locking plate moves up and down between the upper and lower guide plates. The lower end of the locking plate passes through the lower guide plate and is adapted to be inserted into the annular groove of the operating handle. The upper end of the locking plate passes through the upper guide plate and forms 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 grounding 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 lever applies downward pressure to the locking plate through the large compression spring, and the return compression spring provides upward return elastic force to the locking plate.

[0009] Furthermore, a first micro switch and a second micro switch are provided on the lower guide plate; The first micro switch is triggered when the grounding lock plate moves to the lower position. The second micro switch is triggered when the isolation lock plate moves to the lower position.

[0010] Furthermore, a first baffle is provided on the grounding lock plate. When the grounding lock plate moves to the lower position, the first baffle restricts the door lock plate from moving to the left side position. A second baffle is provided on the isolation lock plate. When the isolation lock plate moves to the lower position, the second baffle restricts the door lock plate from moving to the right side position.

[0011] 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 interlocking protection; Method for switching between disconnecting switch tripping and grounding: When the disconnecting switch is in the grounding position: the grounding operating shaft drives the nut to move from the front-to-back middle position to the front side position. The nut drives the front end of the grounding block to abut against the rear end of the grounding lever, thereby pressing the grounding locking plate down and inserting the lower end of the grounding locking plate into the annular groove of the operating handle. As the nut moves to the front side position, the grounding block disengages from the grounding lever. At this time, the front end of the grounding lever returns to its original position and rises, thereby causing the grounding locking plate to move upward away from the annular groove of the operating handle. Only then can the operating handle be removed. When the disconnecting switch is opened: the grounding operating shaft drives the nut to move from the front position to the front-to-back middle position. The nut drives the rear end of the grounding block to abut against the rear end of the grounding lever, thereby pressing down the grounding lock plate at the front end of the grounding lever. The lower end of the grounding lock plate is inserted into the annular groove of the operating handle. As the nut moves to the front-to-back middle position, the grounding block disengages from the grounding lever. At this time, the front end of the grounding lever resets and rises, thereby causing the grounding lock plate to move upward away from the annular groove of the operating handle. Only then can the operating handle be removed. Method for switching between opening and closing of a disconnecting switch: When the disconnecting switch is closed: the grounding operating shaft drives the nut to move from the front-to-back middle position to the rear side position. The nut drives the rear end of the disconnecting block to abut against the rear end of the disconnecting lever, thereby pressing down the front end of the disconnecting lever onto the disconnecting locking plate. The lower end of the disconnecting locking plate is inserted into the annular groove of the operating handle. As the nut moves to the rear side position, the entire disconnecting block leaves the disconnecting lever. At this time, the front end of the disconnecting lever resets and rises, thereby causing the disconnecting locking plate to move upward away from the annular groove of the operating handle. Only then can the operating handle be removed. When the disconnecting switch is tripped: the grounding operating shaft drives the nut to move from the rear position to the front-to-back center position. The nut drives the front end of the disconnecting block to abut against the rear end of the disconnecting lever, thereby pressing down the disconnecting locking plate at the front end of the disconnecting lever. The lower end of the disconnecting locking plate is inserted into the annular groove of the operating handle. As the nut moves to the front-to-back center position, the entire disconnecting block leaves the disconnecting lever. At this time, the front end of the disconnecting lever resets and rises, thereby causing the disconnecting locking plate to move upward away from the annular groove of the operating handle. Only then can the operating handle be removed.

[0012] The beneficial effects of this utility model are: When operating manually, the grounding block or isolation block drives the corresponding locking plate to insert into the ring groove of the operating handle to prevent the handle from being pulled out even when the switch is not in position.

[0013] During electric operation, the micro switch that is engaged with the locking plate presses down, and the contact switching provides 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).

[0014] The baffle on the lock plate controls the opening direction of the door lock. When manual operation is required halfway through electric operation, this baffle ensures that the door lock can only open in one correct direction, thus preventing accidents caused by misoperation. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the direct-acting three-position disconnect switch of this utility model; Figure 2 This is a schematic diagram of the direct-acting three-position disconnect switch (without door lock plate) of this utility model; Figure 3 This is a schematic diagram of the grounding handle interlocking mechanism and the isolating handle interlocking mechanism on the housing; Figure 4 This is a schematic diagram of the grounding handle interlocking mechanism and the isolating handle interlocking mechanism; Figure 5 This is a structural diagram of the door lock plate and the grounding lock plate; Among them, 1. shell, 11. front side panel, 12. rear side panel, 13. door lock panel; 21. Isolation operating shaft; 22. Grounding operating shaft; 23. Nut; 24. Operating handle; 3. Grounding handle interlocking mechanism; 31. Grounding lock plate; 32. Grounding lever; 33. Grounding block; 34. First guide rod; 35. First stop pin; 36. First large compression spring; 37. First reset compression spring; 38. First baffle plate. 4. Isolation handle interlocking mechanism; 41. Isolation lock plate; 42. Isolation lever; 43. Isolation lever; 44. Second guide rod; 45. Second stop pin; 46. Second large compression spring; 47. Second reset compression spring; 48. Second baffle. 51. Upper guide plate; 52. Lower guide plate; 61. First micro switch; 62. Second micro switch. Detailed Implementation

[0017] 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.

[0018] This application provides a direct-acting three-position disconnect switch with interlocking protection, 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, in the following embodiments, 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.

[0019] To address the technical problem that existing three-position disconnecting mechanisms lack clear protective or foolproof measures during electric or manual operation, which can easily lead to subsequent misoperations and, in severe cases, safety accidents affecting personal safety, one embodiment of this application provides a direct-acting three-position disconnecting switch with interlocking protection. This is described in detail below.

[0020] like Figures 1 to 5 As shown, a direct-acting three-position disconnect switch with interlocking protection includes... The housing 1 contains an isolation operating shaft 21 and a grounding operating shaft 22. The grounding operating shaft 22 and the isolation operating shaft 21 rotate synchronously. The grounding operating shaft 22 is a lead screw, and the isolation operating shaft 21 is a smooth rod. The front ends of both the grounding operating shaft 22 and the isolation operating shaft 21 extend out of the housing 1 and form a handle insertion section. Nut 23 is located inside housing 1 and is sleeved on grounding operating shaft 22 and isolating operating shaft 21. When the isolating switch is closed, grounding operating shaft 22 drives nut 23 to move to the rear position; when the isolating switch is grounded, grounding operating shaft 22 drives nut 23 to move to the front position; when the isolating switch is opened, grounding operating shaft 22 drives nut 23 to move to the middle position. When the nut 23 moves from the front-to-back middle position to the front-side position, the grounding handle interlocking mechanism 3 is triggered when the nut 23 is disengaged from the front-to-back middle position, causing the grounding handle interlocking mechanism 3 to lock the grounding operation handle 24, thereby restricting the grounding operation handle 24 from being pulled out from the handle plug section. When the nut 23 reaches the front-side position, the grounding handle interlocking mechanism 3 unlocks the grounding operation handle 24. When the nut 23 moves from the front-to-back middle position to the rear position, the isolation handle interlocking mechanism 4 is triggered when the nut 23 disengages from the front-to-back middle position, causing the isolation handle interlocking mechanism 4 to lock the isolation operating handle 24, thereby preventing the isolation operating handle 24 from being pulled out of the handle insertion section. When the nut 23 reaches the rear position, the isolation handle interlocking mechanism 4 unlocks the isolation operating handle 24.

[0021] In this embodiment, the grounding operating shaft 22 and the isolation operating shaft 21 are connected by gear transmission. The motor of the disconnecting switch drives the grounding operating shaft 22 and the isolation operating shaft 21 to rotate through gear transmission. A clutch is installed at the output end of the motor.

[0022] In this embodiment, as Figure 1 As shown, a door lock plate 13 is provided at the front end of the housing 1. The door lock plate 13 can move left and right at the front end of the housing 1. A door hole is opened in the middle of the door lock plate 13 for the operating handle 24 to pass through. The disconnect switch also includes a panel with a grounding operation hole and an isolation operation hole. The panel is fixed in position relative to the housing 1. The grounding operation hole and the isolation operation hole correspond to the grounding operation shaft 22 and the isolation operation shaft 21 in front and behind. When the door lock plate 13 moves to the right, the door hole connects the grounding operation shaft 22 and the grounding operation hole. At this time, the operating handle 24 can be inserted to perform the grounding operation. When the door lock plate 13 moves to the left, the door hole connects the isolation operation shaft 21 and the isolation operation hole. At this time, the operating handle 24 can be inserted to perform the isolation operation.

[0023] Specifically, as an optional implementation method in this embodiment, such as Figures 2 to 4 As shown, the grounding handle interlocking mechanism 3 includes a grounding lock plate 31, a grounding lever 32, and a grounding block 33. The grounding lock plate 31 moves up and down elastically at the front end of the housing 1. The grounding lock plate 31 is located above the handle insertion section of the grounding operation shaft 22. The middle part of the grounding lever 32 is rotatably connected to the housing 1. The grounding block 33 is fixed on one side of the nut 23.

[0024] When the nut 23 moves, causing the grounding block 33 to move away from the front-to-back center position, the grounding block 33 lifts the rear end of the grounding lever 32, causing the front end of the grounding lever 32 to press down the grounding lock plate 31, thereby inserting the lower end of the grounding lock plate 31 into the annular groove of the operating handle 24 to restrict the removal of the operating handle 24. When the nut 23 reaches the front or rear position, the grounding block 33 disengages from the grounding lever 32. The front end of the grounding lever 32 is reset upward under the elastic force of the grounding locking plate 31, thereby causing the lower end of the grounding locking plate 31 to leave the annular groove of the operating handle 24, and the operating handle 24 is unlocked. At this time, the operating handle 24 can be removed.

[0025] Similarly, the isolation handle interlocking mechanism 4 includes an isolation lock plate 41, an isolation lever 42, and an isolation block 43. The isolation lock plate 41 moves up and down elastically at the front end of the housing 1. The isolation lock plate 41 is located above the handle insertion section of the isolation operating shaft 21. The middle part of the isolation lever 42 is rotatably connected to the housing 1. The isolation block 43 is fixed on the other side of the nut 23.

[0026] When the nut 23 moves, causing the isolation block 43 to move away from the front-to-back center position, the isolation block 43 lifts the rear end of the isolation lever 42, causing the front end of the isolation lever 42 to press down the isolation lock plate 41, thereby inserting the lower end of the isolation lock plate 41 into the annular groove of the operating handle 24 to restrict the removal of the operating handle 24. When the nut 23 reaches the front or rear position, the isolation block 43 disengages from the isolation lever 42. The front end of the isolation lever 42 is reset upward under the elastic force of the isolation locking plate 41, thereby causing the lower end of the isolation locking plate 41 to leave the annular groove of the operating handle 24, and the operating handle 24 is unlocked. At this time, the operating handle 24 can be removed.

[0027] In this embodiment, the grounding block 33 and the isolation block 43 have the same structure, see [link]. Figure 4 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.

[0028] In actual operation, the operating handle 24 needs to rotate the grounding operating shaft 22 one to one and a half turns before the lever end can slide from the guide slope to the plane of the lever block.

[0029] Specifically, as an optional implementation method in this embodiment, such as Figure 3 and Figure 4 As shown, the front end of the housing 1 is provided with an upper guide plate 51 and a lower guide plate 52, and the grounding lock plate 31 and the isolation lock plate 41 move up and down elastically between the upper guide plate 51 and the lower guide plate 52, respectively.

[0030] There are two upper guide plates 51, corresponding to the grounding lock plate 31 and the isolation lock plate 41 respectively, and one lower guide plate 52.

[0031] The lower end of the grounding lock plate 31 passes through the lower guide plate 52 and is adapted to be inserted into the annular groove of the operating handle 24. The upper end of the grounding lock plate 31 passes through the upper guide plate 51 and forms a first guide rod 34. A first stop pin 35 is provided on the first guide rod 34. A first large compression spring 36 and a first reset compression spring 37 are sleeved on the first guide rod 34. The first reset compression spring is located between the first stop pin 35 and the upper guide plate 51. The upper end of the first large compression spring 36 abuts against the front end of the grounding lever 32, and the lower end abuts against the first stop pin 35. The elastic force of the first large compression spring 36 is greater than that of the first reset compression spring. The grounding lever 32 applies downward pressure to the grounding lock plate 31 through the first large compression spring 36, and the first reset compression spring provides upward reset elastic force to the grounding lock plate 31.

[0032] The lower end of the isolation lock plate 41 passes through the lower guide plate 52 and is adapted to be inserted into the annular groove of the operating handle 24. The upper end of the isolation lock plate 41 passes through the upper guide plate 51 and forms a second guide rod 44. A second stop pin 45 is provided on the second guide rod 44. A second large compression spring 46 and a second reset compression spring 47 are sleeved on the second guide rod 44. The second reset compression spring is located between the second stop pin 45 and the upper guide plate 51. The upper end of the second large compression spring 46 abuts against the front end of the isolation lever 42, and the lower end abuts against the second stop pin 45. The elastic force of the second large compression spring 46 is greater than that of the second reset compression spring. The isolation lever 42 applies downward pressure to the isolation lock plate 41 through the second large compression spring 46, and the second reset compression spring provides upward reset elastic force to the isolation lock plate 41.

[0033] Specifically, as an optional implementation method in this embodiment, such as Figure 3 and Figure 4 As shown, a first micro switch 61 and a second micro switch 62 are provided on the lower guide plate 52; When the grounding lock plate 31 moves to the lower position, the first micro switch 61 is triggered; when the isolation lock plate 41 moves to the lower position, the second micro switch 62 is triggered.

[0034] In this embodiment, the two microswitches are mainly used in electric mode. When the motor drives the nut 23 to move halfway through its travel and power is cut off, the specific microswitch that is triggered can be used to determine which locking plate is pressed down, thus indicating the switch's state. If the first microswitch 61 is triggered, it means the grounding locking plate 31 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 is triggered, it means the isolation locking plate 41 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.

[0035] Specifically, as an optional implementation method in this embodiment, such as Figure 5 As shown, a first baffle 38 is provided on the grounding lock plate 31. When the grounding lock plate 31 moves to the lower position, the first baffle 38 restricts the door lock plate 13 from moving to the left side position. A second baffle 48 is provided on the isolation lock plate 41. When the isolation lock plate 41 moves to the lower position, the second baffle 48 restricts the door lock plate 13 from moving to the right side position.

[0036] In this embodiment, the first baffle 38 is formed by bending on the grounding lock plate 31, and the second baffle 48 is formed by bending on the isolation lock plate 41.

[0037] When both locking plates are in the upper position, it means that nut 23 is in the front-to-back middle position. As long as nut 23 moves away from the front-to-back middle position, one of the locking plates will be pressed down. Pressing down the grounding locking plate 31 means that the switch is performing a grounding operation. At this time, the door lock plate 13 is restricted to move to the left to open the isolation operation hole of the switch. Pressing down the isolation locking plate 41 means that the switch is performing an isolation operation. At this time, the door lock plate 13 is restricted to move to the right to open the grounding operation hole of the switch to prevent workers from operating it by mistake.

[0038] Specifically, as an optional implementation method in this embodiment, such as Figures 1 to 3 As shown, the housing 1 includes a front side plate 11, a rear side plate 12, an upper middle partition plate, and a lower middle partition plate. The isolation operation shaft 21 and the grounding operation shaft 22 are disposed between the front side plate 11 and the rear side plate 12. The grounding lever 32 and the isolation lever 42 are respectively mounted on the upper middle partition plate.

[0039] A method for operating a direct-acting three-position disconnect switch, using the aforementioned direct-acting three-position disconnect switch with interlocking protection; Method for switching between disconnecting switch tripping and grounding: When the disconnecting switch is grounded: the grounding operating shaft 22 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 33 to start to abut against the rear end of the grounding lever 32, thereby causing the front end of the grounding lever 32 to press down the grounding locking plate 31, so that the lower end of the grounding locking plate 31 is inserted into the annular groove of the operating handle 24. As the nut 23 moves to the front side position, the grounding block 33 disengages from the grounding lever 32. At this time, the front end of the grounding lever 32 resets and rises, thereby causing the grounding locking plate 31 to move upward away from the annular groove of the operating handle 24. Only then can the operating handle 24 be removed. When the disconnecting switch is tripped: the grounding operating shaft 22 drives the nut 23 to move from the front position to the front-to-back middle position. The nut 23 drives the rear end of the grounding block 33 to abut against the rear end of the grounding lever 32, thereby causing the front end of the grounding lever 32 to press down the grounding locking plate 31, so that the lower end of the grounding locking plate 31 is inserted into the annular groove of the operating handle 24. As the nut 23 moves to the front-to-back middle position, the grounding block 33 disengages from the grounding lever 32. At this time, the front end of the grounding lever 32 resets and rises, thereby causing the grounding locking plate 31 to move upward away from the annular groove of the operating handle 24. Only then can the operating handle 24 be removed. In electric mode, the motor drives the grounding operation shaft 22 to rotate. When the grounding lock plate 31 moves down, it triggers the first micro switch 61, at which point it can be known that the switch is performing a grounding action.

[0040] Method for switching between opening and closing of a disconnecting switch: When the disconnecting switch is closed: the grounding operating shaft 22 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 disconnecting block 43 to abut against the rear end of the disconnecting lever 42, thereby causing the front end of the disconnecting lever 42 to press down the disconnecting locking plate 41, so that the lower end of the disconnecting locking plate 41 is inserted into the annular groove of the operating handle 24. As the nut 23 moves to the rear side position, the disconnecting block 43 disengages from the disconnecting lever 42. At this time, the front end of the disconnecting lever 42 resets and rises, thereby causing the disconnecting locking plate 41 to move upward away from the annular groove of the operating handle 24. Only then can the operating handle 24 be removed. When the disconnecting switch is tripped: the grounding operating shaft 22 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 43 to abut against the rear end of the disconnecting lever 42, thereby causing the front end of the disconnecting lever 42 to press down the disconnecting locking plate 41, so that the lower end of the disconnecting locking plate 41 is inserted into the annular groove of the operating handle 24. As the nut 23 moves to the front-to-back middle position, the disconnecting block 43 disengages from the disconnecting lever 42. At this time, the front end of the disconnecting lever 42 resets and rises, thereby causing the disconnecting locking plate 41 to move upward away from the annular groove of the operating handle 24. Only then can the operating handle 24 be removed.

[0041] The interlocking mechanism on the direct-acting three-position disconnector of this utility model mainly serves three functions: First: When operating manually, the grounding block 33 or the isolation block 43 drives the corresponding locking plate to be inserted into the annular groove of the operating handle 24 to prevent the handle from being pulled out even when the switch is not in position.

[0042] 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).

[0043] Third: The baffle on the lock plate can control the opening direction of the door lock plate 13. 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 13 can only open in one correct direction, thereby avoiding accidents caused by misoperation.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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 interlocking protection, characterized in that, include The housing contains an isolation operating shaft and a grounding operating shaft, which rotate synchronously. The grounding operating shaft is a lead screw, and the isolation operating shaft is a smooth rod. The front ends of both the grounding operating shaft and the isolation operating shaft extend out of the housing and form a handle insertion section. The nut is located inside the housing and is fitted onto the grounding operating shaft and the isolating operating shaft. 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; when the isolating switch is opened, the grounding operating shaft moves the nut to the middle position. When the nut moves from the front-to-back center position to the front-side position, the grounding handle interlocking mechanism is triggered when the nut is disengaged from the front-to-back center position. This triggers the grounding handle interlocking mechanism to lock the grounding operating handle, thereby preventing the grounding operating handle from being pulled out of the handle plug section. When the nut reaches the front-side position, the grounding handle interlocking mechanism unlocks the grounding operating handle. When the nut moves from the front-to-back center position to the rear position, the isolation handle interlocking mechanism is triggered when the nut disengages from the front-to-back center position. This locks the isolation handle, preventing it from being pulled out of the handle insertion section. When the nut reaches the rear position, the isolation handle interlocking mechanism unlocks the isolation handle.

2. The direct-acting three-position disconnector with interlocking protection according to claim 1, characterized in that, Both the grounding handle interlocking mechanism and the isolating handle interlocking mechanism include A locking plate is located at the front end of the housing and above the handle insertion section; the locking plate can move up and down elastically. A lever, which is designed to rotate on the housing; A lever, which is mounted on the nut; When the nut moves the lever away from the center position, the lever lifts the rear end of the lever, causing the front end of the lever to press down on the locking plate, so that the lower end of the locking plate is inserted into the annular groove of the operating handle to prevent the operating handle from being removed. When the nut reaches the front or rear position, the lever disengages from the lever, and the front end of the lever returns to its original position under the action of the locking plate's elasticity, thereby causing the lower end of the locking plate to leave the operating handle's annular groove, and the operating handle to unlock.

3. The direct-acting three-position disconnector with interlocking protection according to claim 2, characterized in that, The front end of the housing is provided with an upper guide plate and a lower guide plate. The locking plate moves up and down between the upper and lower guide plates. The lower end of the locking plate passes through the lower guide plate and is adapted to be inserted into the annular groove of the operating handle. The upper end of the locking plate passes through the upper guide plate and forms a guide rod. A stop pin is provided on the guide rod. A large compression spring and a return spring are sleeved on the guide rod. The return 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 grounding 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 spring. The lever applies downward pressure to the locking plate through the large compression spring, and the return spring provides upward return elastic force to the locking plate.

4. The direct-acting three-position disconnector with interlocking protection according to claim 2, characterized in that, The lower guide plate is provided with a first micro switch and a second micro switch; The first micro switch is triggered when the grounding lock plate moves to the lower position. The second micro switch is triggered when the isolation lock plate moves to the lower position.

5. The direct-acting three-position disconnector with interlocking protection according to claim 2, characterized in that, A first baffle is provided on the grounding lock plate. When the grounding lock plate moves to the lower position, the first baffle restricts the door lock plate from moving to the left side position. A second baffle is provided on the isolation lock plate. When the isolation lock plate moves to the lower position, the second baffle restricts the door lock plate from moving to the right side position.

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