Direct-acting type three-position isolating switch with interlocking protection and working method of direct-acting type three-position isolating switch

Abstract

The invention relates to a direct-acting three-position isolating switch with interlocking protection and a working method thereof. The direct-acting three-position isolating switch comprises a shell, and an isolating operation shaft and a grounding operation shaft are arranged in the shell; the nut is positioned in the shell and is sleeved on the grounding operation shaft and the isolation operation shaft; when the nut is separated from the front and back middle position, the grounding handle interlocking mechanism is triggered, so that the grounding handle interlocking mechanism locks the grounding operation handle, and when the nut reaches the front side position, the grounding handle interlocking mechanism unlocks the grounding operation handle; and when the nut is separated from the front and rear middle positions, the isolation handle interlocking mechanism is triggered, so that the isolation handle interlocking mechanism locks the isolation operation handle, and when the nut reaches the rear side position, the isolation handle interlocking mechanism unlocks the isolation operation handle. The grounding shifting block or the isolation shifting block drives the corresponding lock plate to be inserted into the annular groove of the operation handle, and the defect that the handle can be pulled out when the switch is not in place is overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrical equipment, in particular to a direct-acting three-position disconnecting switch with interlocking protection and a working method thereof. BACKGROUND

[0002] With the development of domestic power market and the addition of use occasions, C-GIS circuit breaker cabinets are used more and more widely, and the technical requirements for the three-position disconnecting switches arranged thereon, especially the direct-acting three-position disconnecting switches, are also more and more, and the required reliability is also higher and higher. Three positions refer to three positions, which are a closed position, an open position (also referred to as an intermediate position) and a grounding position.

[0003] The double-hole operation three-position disconnecting switch on the market has the following defects in actual use: when the disconnecting switch is in the open position, the screw rod nut is in the intermediate position. Assuming that grounding or isolation operation is required at this time, the screw rod needs to drive the screw rod nut to move towards the grounding position or the isolation direction. If it is manual operation, the operating handle needs to be inserted to drive the screw rod to rotate. However, the operating handle cannot be pulled out during manual operation. Only when the screw rod nut is moved to the grounding position can the operating handle be pulled out. If the handle is pulled out halfway, misoperation is likely to occur. The current disconnecting switch lacks protection that the operating handle can be pulled out only when it is in place. Secondly, if it is electric operation, the motor drives the screw rod nut to move towards the grounding position or the isolation direction halfway, and power failure occurs. After power is restored, the state position of the switch cannot be directly determined, and there is a lack of judgment basis. Finally, when electric operation is halfway, manual operation is required due to some reasons, and the door lock plate cannot be ensured to be opened in only one direction, which is likely to cause misoperation.

[0004] In summary, the current three-position isolation mechanism lacks clear protection or foolproof measures during electric or manual operation, which is likely to cause subsequent misoperation, and in severe cases, safety accidents and personal safety are likely to occur. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art, provide a direct-acting three-position disconnecting switch with interlocking protection and a working method thereof, and solve the technical problem that the current three-position isolation mechanism lacks clear protection or foolproof measures during electric or manual operation, which is likely to cause subsequent misoperation, and in severe cases, safety accidents and personal safety are likely to occur.

[0006] The technical solution adopted by the present application to solve the technical problem is: First aspect: A direct-acting three-position disconnecting switch with interlocking protection is provided, comprising The shell is provided with an isolation operation shaft and a grounding operation shaft, the grounding operation shaft and the isolation operation shaft rotate synchronously, the grounding operation shaft is a screw rod, and the isolation operation shaft is a light pole, the front ends of the grounding operation shaft and the isolation operation shaft extend out of the shell and form a handle insertion section; A nut is located in the shell and is sleeved on the grounding operation shaft and the isolation operation shaft, when the disconnecting switch is closed, the grounding operation shaft drives the nut to move to a rear position, when the disconnecting switch is grounded, the grounding operation shaft drives the nut to move to a front position, and when the disconnecting switch is opened, the grounding operation shaft drives the nut to move to a middle position between the front position and the rear position; A grounding handle interlocking mechanism, when the nut moves from the middle position to the front position, the nut triggers the grounding handle interlocking mechanism when the nut is separated from the middle position, the grounding handle interlocking mechanism locks the grounding operation handle, so that the grounding operation handle is prevented from being pulled out of the handle insertion section, and when the nut reaches the front position, the grounding handle interlocking mechanism unlocks the grounding operation handle. An isolation handle interlocking mechanism, when the nut moves from the middle position to the rear position, the nut triggers the isolation handle interlocking mechanism when the nut is separated from the middle position, the isolation handle interlocking mechanism locks the isolation operation handle, so that the isolation operation handle is prevented from being pulled out of the handle insertion section, and when the nut reaches the rear position, the isolation handle interlocking mechanism unlocks the isolation operation handle.

[0007] Further, the grounding handle interlocking mechanism and the isolation handle interlocking mechanism each include A lock plate is located at the front end of the shell and above the handle insertion section, and the lock plate moves up and down elastically; A lever is arranged to rotate on the shell; A pushing block is arranged on the nut; When the nut drives the pushing block to move away from the middle position, the pushing block lifts the rear end of the lever, drives the front end of the lever to press down the lock plate, so that the lower end of the lock plate is inserted into a ring groove of the operation handle, to prevent the operation handle from being pulled out; When the nut reaches the front position or the rear position, the pushing block is separated from the lever, the front end of the lever is reset upward under the action of the elastic force of the lock plate, so that the lower end of the lock plate is separated from the ring groove of the operation handle, and the operation handle is unlocked.

[0008] Further, the front end of the shell is provided with an upper guide plate and a lower guide plate, the lock plate moves up and down between the upper guide plate and the lower guide plate, the lower end of the lock plate passes through the lower guide plate and is adapted to be inserted into the ring groove of the operation handle, the upper end of the lock plate passes through the upper guide plate and forms a guide rod, a stop pin is arranged on the guide rod, a large compression spring and a reset compression spring are sleeved on the guide rod, the reset 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 of the large compression spring abuts against the stop pin, the elastic force of the large compression spring is greater than that of the reset compression spring, the lever applies a downward pressure to the lock plate through the large compression spring, and the reset compression spring provides an upward reset elastic force to the lock plate.

[0009] Further, 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.

[0010] Further, the grounding lock plate is provided with a first baffle, which limits the door lock plate to move to the left side when the grounding lock plate moves to the lower position. The isolation lock plate is provided with a second baffle, which limits the door lock plate to move to the right side when the isolation lock plate moves to the lower position.

[0011] Second aspect: A working method of a direct-acting three-position isolating switch is provided, which adopts the above-mentioned direct-acting three-position isolating switch with interlocking protection. Switching method between isolating switch opening and grounding: When the isolating switch is closed, the grounding operating shaft drives the nut to move from the front-rear middle position to the front side position, the nut drives the grounding block to start abutting the rear end of the grounding lever, so that the front end of the grounding lever presses down the grounding lock plate, and the lower end of the grounding lock plate is inserted into the ring groove of the operating handle. As the nut moves to the front side position, the grounding block is separated from the grounding lever, at which time the front end of the grounding lever is reset and lifted, so that the grounding lock plate is separated from the ring groove of the operating handle, and at this time the operating handle can be removed. When the isolating switch is opened, the grounding operating shaft drives the nut to move from the front side position to the front-rear middle position, the nut drives the grounding block to start abutting the rear end of the grounding lever, so that the front end of the grounding lever presses down the grounding lock plate, and the lower end of the grounding lock plate is inserted into the ring groove of the operating handle. As the nut moves to the front-rear middle position, the grounding block is separated from the grounding lever, at which time the front end of the grounding lever is reset and lifted, so that the grounding lock plate is separated from the ring groove of the operating handle, and at this time the operating handle can be removed. Switching method between isolating switch opening and closing: When the isolating switch is closed, the grounding operating shaft drives the nut to move from the front-rear middle position to the rear side position, the nut drives the grounding block to start abutting the rear end of the grounding lever, so that the front end of the grounding lever presses down the grounding lock plate, and the lower end of the grounding lock plate is inserted into the ring groove of the operating handle. As the nut moves to the front-rear middle position, the grounding block is separated from the grounding lever, at which time the front end of the grounding lever is reset and lifted, so that the grounding lock plate is separated from the ring groove of the operating handle, and at this time the operating handle can be removed. When the isolating switch is opened, the grounding operating shaft drives the nut to move from the rear side to the front and rear middle position, the nut drives the isolating block front end to start abutting the isolating lever rear end, so that the isolating lever front end presses down the isolating lock plate, and the lower end of the isolating lock plate is inserted into the ring groove of the operating handle, with the nut moving to the front and rear middle position, the whole isolating block is away from the isolating lever, at this time the isolating lever front end resets and lifts up, so that the isolating lock plate is upward away from the ring groove of the operating handle, at this time the operating handle can be removed.

[0012] The beneficial effects of the present application are: When manually operated, the corresponding lock plate is inserted into the ring groove of the operating handle through the grounding block or the isolating block, preventing the handle from being pulled out when the switch is not in place.

[0013] When electrically operated, the lock plate presses down the micro switch, and the micro switch gives a clear position signal of the isolating switch (for example, when the electric operation is suddenly stopped at half way, the circuit can clearly determine the position of the switch after power is restored, and provide a basis for subsequent electric operation).

[0014] The baffle arranged on the lock plate can control the opening direction of the lock plate. When the electric operation is half way and needs to be manually operated due to some reasons, the baffle limiting cooperation can ensure that the lock plate can only be opened in one correct direction, thereby avoiding accidents caused by misoperation. BRIEF DESCRIPTION OF DRAWINGS

[0015] The present application will be further described below in conjunction with the drawings.

[0016] Figure 1 is a schematic diagram of the direct-acting three-position isolating switch of the present application; Figure 2 is a schematic diagram of the direct-acting three-position isolating switch (without lock plate) of the present application; Figure 3 is a schematic diagram of the grounding handle interlocking mechanism and the isolating handle interlocking mechanism on the shell; Figure 4 is a schematic diagram of the grounding handle interlocking mechanism and the isolating handle interlocking mechanism; Figure 5 is a structural diagram between the lock plate and the grounding lock plate; 1, shell, 11, front side plate, 12, rear side plate, 13, lock plate; 21, isolating 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; 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 the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[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 side position or the rear side position, the grounding push block 33 is separated from the grounding lever 32, the front end of the grounding lever 32 is reset upward under the elastic force of the grounding lock plate 31, so that the lower end of the grounding lock plate 31 is separated from the ring 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 comprises an isolation lock plate 41, an isolation lever 42 and an isolation push block 43, the isolation lock plate 41 is elastically moved up and down at the front end of the shell 1, the isolation lock plate 41 is above the handle insertion section of the isolation operating shaft 21, the middle part of the isolation lever 42 is rotationally connected with the shell 1, and the isolation push block 43 is fixed on the other side of the nut 23.

[0026] When the nut 23 moves and drives the isolation push block 43 to be separated from the front and rear middle positions, the isolation push block 43 lifts the rear end of the isolation lever 42, drives the front end of the isolation lever 42 to press the isolation lock plate 41 downward, so that the lower end of the isolation lock plate 41 is inserted into the ring groove of the operating handle 24, to limit the removal of the operating handle 24; When the nut 23 reaches the front side position or the rear side position, the isolation push block 43 is separated from the isolation lever 42, the front end of the isolation lever 42 is reset upward under the elastic force of the isolation lock plate 41, so that the lower end of the isolation lock plate 41 is separated from the ring 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 the embodiment, the grounding push block 33 and the isolation push block 43 have the same structure, as shown in Figure 4 The front and rear ends of the push block are respectively a guide slope, the upper end of the push block is a plane, when the push block cooperates with the lever, the end part of the lever is first slid to the plane through the guide slope, the length of the plane corresponds to the length of the nut 23 between adjacent positions, to ensure that the nut 23 is always in the state of pressing the lock plate in the stroke.

[0028] In actual work, the operating handle 24 needs to rotate one circle or one and a half circles to drive the end part of the lever to slide from the guide slope to the plane of the push block.

[0029] Specifically, as an optional embodiment in the embodiment, as shown in Figure 3 and Figure 4 The front end of the shell 1 is provided with an upper guide plate 51 and a lower guide plate 52, the grounding lock plate 31 and the isolation lock plate 41 are elastically moved up and down between the upper guide plate 51 and the lower guide plate 52.

[0030] The number of the upper guide plate 51 is two, corresponding to the grounding lock plate 31 and the isolation lock plate 41 respectively, and the number of the lower guide plate 52 is one.

[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 ring groove of the operating handle 24, and the upper end of the grounding lock plate 31 passes through the upper guide plate 51 and forms the first guide rod 34, the first guide rod 34 is provided with the first stop pin 35, the first guide rod 34 is sleeved with the first large compression spring 36 and the first reset compression spring 37, 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 of the first large compression spring 36 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 a downward pressure on the grounding lock plate 31 through the first large compression spring 36, and the first reset compression spring provides an upward reset elastic force on 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 ring groove of the operating handle 24, and the upper end of the isolation lock plate 41 passes through the upper guide plate 51 and forms the second guide rod 44, the second guide rod 44 is provided with the second stop pin 45, the second guide rod 44 is sleeved with the second large compression spring 46 and the second reset compression spring 47, 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 of the second large compression spring 46 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 a downward pressure on the isolation lock plate 41 through the second large compression spring 46, and the second reset compression spring provides an upward reset elastic force on the isolation lock plate 41.

[0033] Specifically, as an optional implementation manner in the embodiment, as shown in Figure 3 and Figure 4 The lower guide plate 52 is provided with the first micro switch 61 and the second micro switch 62; The first micro switch 61 is triggered when the grounding lock plate 31 moves to the lower position, and the second micro switch 62 is triggered when the isolation lock plate 41 moves to the lower position.

[0034] The two micro switches of the embodiment are mainly applied in the electric mode. When the motor drives the nut 23 to move to the middle of the stroke and power is cut off, it can be judged that which lock plate is pressed down by observing which micro switch is triggered, so as to know the state of the switch. If the first micro switch 61 is triggered, it means that the grounding lock plate 31 is pressed down, and it means that the nut 23 is in the grounding stroke between the front and rear middle positions and the front position. If the second micro switch is triggered, it means that the isolation lock plate 41 is pressed down, and it means that the nut 23 is in the isolation stroke between the front and rear middle positions and the rear position.

[0035] Specifically, as an optional implementation manner in the embodiment, as shown in Figure 5 The grounding lock plate 31 is provided with the first stop plate 38, when the grounding lock plate 31 moves to the lower position, the first stop plate 38 limits the door lock plate 13 to move to the left side. The second stop plate 48 is arranged on the isolation lock plate 41, and limits the door lock plate 13 to move to the right position when the isolation lock plate 41 moves to the lower position.

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

[0037] When the two lock plates are in the upper position, it means that the nut 23 is in the front-rear middle position, and as long as the nut 23 is away from the front-rear middle position, one of the lock plates will be pressed down. If the grounding lock plate 31 is pressed down, it means that the switch is in grounding operation, and at this time, the isolation of the door lock plate 13 to the left is limited to open the isolation operation hole of the switch. If the isolation lock plate 41 is pressed down, it means that the switch is in isolation operation, and at this time, the isolation of the door lock plate 13 to the right is limited to open the grounding operation hole of the switch, preventing workers from misoperation.

[0038] Specifically, as an optional embodiment in the embodiment, as shown in Figures 1 to 3 The shell 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 arranged between the front side plate 11 and the rear side plate 12. The grounding lever 32 and the isolation lever 42 are respectively installed on the upper middle partition plate and the lower middle partition plate.

[0039] A working method of a direct-acting three-position isolation switch, which adopts the above-mentioned direct-acting three-position isolation switch with interlocking protection; Switching method between isolation switch opening and grounding: When the isolation switch is in grounding closing, the grounding operation shaft 22 drives the nut 23 to move from the front-rear middle position to the front side position. The nut 23 drives the front end guide inclined surface of the grounding block 33 to begin abutting against the rear end of the grounding lever 32, so that the front end of the grounding lever 32 presses down the grounding lock plate 31, and the lower end of the grounding lock plate 31 is inserted into the ring groove of the operation handle 24. As the nut 23 moves to the front side position, the grounding block 33 is separated from the grounding lever 32, at this time, the front end of the grounding lever 32 is reset and lifted, so that the grounding lock plate 31 is upwardly separated from the ring groove of the operation handle 24, and at this time, the operation handle 24 can be removed. When the isolation switch is in grounding closing, the grounding operation shaft 22 drives the nut 23 to move from the front-rear middle position to the front side position. The nut 23 drives the front end guide inclined surface of the grounding block 33 to begin abutting against the rear end of the grounding lever 32, so that the front end of the grounding lever 32 presses down the grounding lock plate 31, and the lower end of the grounding lock plate 31 is inserted into the ring groove of the operation handle 24. As the nut 23 moves to the front side position, the grounding block 33 is separated from the grounding lever 32, at this time, the front end of the grounding lever 32 is reset and lifted, so that the grounding lock plate 31 is upwardly separated from the ring groove of the operation handle 24, and at this time, the operation handle 24 can be removed. When the electric mode, the motor drives the grounding operation shaft 22 to rotate, when the grounding lock plate 31 moves down to trigger the first micro switch 61, at this time, it can be known that the switch is in grounding operation.

[0040] The switching method between the opening and closing of the isolating switch: When the isolating switch is closed, the grounding operation shaft 22 drives the nut 23 to move from the front and rear middle position to the rear side position, the nut 23 drives the rear end of the isolation block 43 to abut against the rear end of the isolation lever 42, so that the front end of the isolation lever 42 presses down the isolation lock plate 41, and the lower end of the isolation lock plate 41 is inserted into the ring groove of the operation handle 24, and as the nut 23 moves to the rear side position, the isolation block 43 is separated from the isolation lever 42, at this time, the front end of the isolation lever 42 is reset and lifted, so that the isolation lock plate 41 is separated from the ring groove of the operation handle 24, and at this time, the operation handle 24 can be removed. When the isolating switch is opened, the grounding operation shaft 22 drives the nut 23 to move from the rear side position to the front and rear middle position, the nut 23 drives the front end of the isolation block 43 to abut against the rear end of the isolation lever 42, so that the front end of the isolation lever 42 presses down the isolation lock plate 41, and the lower end of the isolation lock plate 41 is inserted into the ring groove of the operation handle 24, and as the nut 23 moves to the front and rear middle position, the isolation block 43 is separated from the isolation lever 42, at this time, the front end of the isolation lever 42 is reset and lifted, so that the isolation lock plate 41 is separated from the ring groove of the operation handle 24, and at this time, the operation handle 24 can be removed.

[0041] The interlocking mechanism of the direct-acting three-position isolating switch mainly plays three roles: Firstly, when manually operating, the grounding block 33 or the isolation block 43 drives the corresponding lock plate to be inserted into the ring groove of the operation handle 24, so as to prevent the handle from being pulled out when the switch is not in place.

[0042] Secondly, when electrically operating, the lock plate presses down the micro switch, and the contact switching gives a clear position signal of the isolating switch (for example, when the electric operation is suddenly stopped at half of the operation, and after the power is restored, the grounding side micro switch signal is converted, so that the electric circuit can clearly judge the state position of the switch, and provide a basis for subsequent electric operation).

[0043] Thirdly, the baffle on the lock plate can control the opening direction of the door lock plate 13. When the electric operation is half way and needs to be manually operated due to some reasons, the baffle limiting cooperation can ensure that the door lock plate 13 can only be opened in a correct direction, so as to avoid accidents caused by misoperation.

[0044] In this application, each device (parts without specific structure) is a general standard part or a part known to those skilled in the art, and its structure and principle can be known by technical personnel through technical manual or through conventional experimental method.

[0045] In the description of the embodiments of the present application, unless specifically defined and limited, the terms "mount", "connect", "connection" should be understood as a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0047] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some communication interfaces, devices or units, and can be electrical, mechanical or other forms.

[0048] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. According to actual needs, part or all of the units can be selected to achieve the purpose of the embodiment scheme.

[0049] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0050] With the above ideal embodiments according to the present application as the inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and 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 sleeved on 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 middle position to the front-side position, the grounding handle interlocking mechanism is triggered when the nut is disengaged from the front-to-back middle 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.

6. A method for operating a direct-acting three-position disconnector, characterized in that, The direct-acting three-position disconnect switch with interlocking protection as described in any one of claims 1-5 is adopted; 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 lever 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 lever 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.

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