Operating handle locking mechanism of load switch

Abstract

The utility model relates to an operating handle locking mechanism of a load switch, which comprises a shell, a plurality of solid-sealed polar poles and an energy storage operating mechanism, vacuum arc-extinguishing chambers are arranged in the solid-sealed polar poles, insulating pull rods, moving terminals and static terminals are arranged in the vacuum arc-extinguishing chambers, the energy storage operating mechanism is linked with the insulating pull rods through a rotating shaft, and the rotating shaft is driven by an operating handle. The housing is provided with a locking mechanism, and the locking mechanism comprises a fixed seat fixedly arranged on the housing; the blocking pin penetrates through the fixed seat in a sliding manner; the swinging piece is pivoted to the shell and is provided with a first connecting arm and a second connecting arm; one end of the traction rod is hinged to the free end of the first connecting arm; the stop lever is fixedly arranged on the operating handle, and the motion trail intersects with the axis of the stop pin; the free end of the second connecting arm is hinged to a blocking pin, when the traction rod is controlled to be pulled, the blocking pin is driven to stretch into the motion path of the blocking rod, and the risk of misoperation of an outdoor switch is solved through the pure mechanical passive locking design.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to an operating handle locking mechanism of a load switch. Background Art

[0002] A load switch is a critical device in power systems used to connect, carry, and interrupt normal currents (including specified overload currents) and to close and carry specified short-circuit currents. Vacuum load switches are widely used in medium-voltage power distribution due to their superior interrupting performance, long life, maintenance-free operation, and environmental friendliness (compared to traditional SF6 gas-insulated switches). The core component of a vacuum load switch is a vacuum interrupter encapsulated in an insulating material such as epoxy resin. The opening and closing of its moving and stationary contacts are controlled by an insulated pull rod, and the operating handle is driven by a stored-energy operating mechanism to open or close the switch.

[0003] The operating handle is the direct control component for switching the switch between open and closed states. Preventing accidental operation of the operating handle is crucial during switchgear operation, maintenance, and especially overhaul. Accidental closing can energize the line being repaired, resulting in serious injury or death; accidental opening can impact power supply reliability. Therefore, ensuring that the operating handle can be reliably locked in either the open or closed position (usually the open position) when required is a key requirement for switchgear safety design.

[0004] Currently, common locking methods for vacuum or SF6 load switch operating handles include: Padlock-type mechanical locks: A simple lockhole is provided on the operating handle or mechanism box, and a padlock is used to physically restrict handle movement. This method is simple in structure, but typically requires the operator to provide their own padlock. Furthermore, the lock is exposed to the environment and susceptible to environmental influences (such as rust and dust clogging the lockhole). It also has low reliability, lacks intuitive locking status, and cannot be effectively integrated with anti-incorrect locking systems.

[0005] Internal mechanical interlocking: This approach uses a complex internal linkage or cam mechanism to interlock the handle with the switch status or other components (such as a grounding switch). This solution offers greater security, but is complex and expensive. Furthermore, locking often requires opening the switch housing, increasing operational complexity and safety risks. This is particularly inconvenient in maintenance scenarios where frequent locking and unlocking are required.

[0006] Electromagnetic locks / electrically controlled locks: These locks are opened and closed using an external power source or signal. This method facilitates remote control and integration with five-security systems. However, it relies on an external power source and control system, which can lead to failure in the event of a power outage or control system failure. Furthermore, it is relatively expensive and more complex to maintain.

[0007] Existing technologies, especially mechanical locking methods, generally have the following deficiencies: Inconvenient operation: The padlock type requires an additional lock, and the built-in type often requires opening the cover for operation. Reliability issues: The exposed keyhole is easily affected by the environment and fails; the simple structure may fail under strong vibration or misoperation impact. Poor integration: It is difficult to intuitively display the locking status, and the correlation with the status indication of the switch body is weak. Safety hazards: The built-in locking requires opening the cover for operation, which increases the risk of exposure to live parts. Insufficient holding force for the opening and closing positions: Some locking mechanisms only prevent the handle from moving, but fail to effectively enhance the holding force of the operating mechanism at the opening / closing limit position, and position drift may occur under vibration or impact.

[0008] Therefore, there is an urgent need for an operating handle locking mechanism for vacuum load switches (which is also suitable for solving similar problems in SF6 switches). The mechanism should have the advantages of simple and reliable structure, firm locking, effective prevention of misoperation, and enhanced retention of the switch in the target position (especially the opening position) to meet the increasingly stringent requirements of the power system for operational safety. Utility Model Content

[0009] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide an operating handle locking mechanism for a load switch.

[0010] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a locking mechanism for an operating handle of a load switch, comprising a shell, a plurality of sealed poles and an energy storage operating mechanism, wherein a vacuum arc extinguishing chamber is provided in the sealed pole, and an insulating pull rod, a moving terminal and a static terminal are provided in the vacuum arc extinguishing chamber, and the energy storage operating mechanism links the insulating pull rods through a rotating shaft, and the rotating shaft is driven by an operating handle to synchronously control the contact or separation of all moving terminals and static terminals, and a locking mechanism is provided on the shell, comprising: a fixed seat connected to the shell; a blocking pin, slidably penetrated through the fixed seat; a swinging member, pivotally connected to the shell, and having a first connecting arm and a second connecting arm; a traction rod, one end of which is hinged to the free end of the first connecting arm; a blocking rod, fixed to the operating handle, and its motion trajectory intersects with the axis of the blocking pin; the free end of the second connecting arm is hinged to the blocking pin, and when the traction rod is pulled in a controlled manner, the blocking pin is driven to extend into the motion path of the blocking rod.

[0011] As a preferred technical solution of the present invention, a V-shaped angle is formed between the first connecting arm and the second connecting arm.

[0012] As a preferred technical solution of the present invention, the outer side of the shell is fixedly connected to a cover plate, and the cover plate includes: a side hole for the blocking pin to move telescopically; and a movable hole for the traction rod to pass through and axially displace.

[0013] As a preferred technical solution of the present invention, the free end of the second connecting arm is provided with an oblong hole, the end of the blocking pin is fixedly connected to the pin shaft, and the pin shaft is loosely fitted in the oblong hole to form a floating hinge structure.

[0014] As an optimal technical solution of the present utility model, the energy storage operating mechanism includes: an operating shaft, pivotally connected to the shell and connected to the operating handle; a first linkage swing arm, one end of which is fixed to the operating shaft, and the other end is connected to the first movable shaft; a second linkage swing arm, one end of which is pivotally connected to the operating shaft, and the other end is connected to the second movable shaft, and the second linkage swing arm is driven and connected to the rotating shaft; a mounting frame, fixed in the shell, and symmetrically provided with movable grooves on both sides for constraining the movement path of the first movable shaft or the second movable shaft; a first tension spring is connected between the first movable shaft and the second movable shaft; when the operating handle drives the first movable shaft to move to the first limit position or the second limit position of the movable groove, the second movable shaft moves synchronously to the corresponding limit position under the action of the first tension spring, triggering the opening / closing action.

[0015] As a preferred technical solution of the present invention, the movable groove is an arc-shaped guide groove.

[0016] As a preferred technical solution of the present invention, at least one of the two ends of the movable groove is provided with an elastic clamping mechanism; the elastic clamping mechanism includes: a tightening bayonet, configured to lock the first movable shaft or the second movable shaft that slides to the end of the movable groove; the width of the tightening bayonet can be dynamically adjusted to adapt to the clamping or release of the first movable shaft or the second movable shaft.

[0017] As a preferred technical solution of the present invention, the elastic clamping mechanism also includes: an active arm, one end of which is pivotally connected to the mounting frame; a clamping arm, one end of which is pivotally connected to the mounting frame; a traction arm, both ends of which are pivotally connected to the free end of the active arm and the free end of the clamping arm respectively; a second tension spring, one end of which is connected to the mounting frame and the other end is connected to the middle part of the active arm, driving the active arm to swing toward the center of curvature of the movable slot.

[0018] To sum up, the beneficial effects of the present invention are: the user pulls the traction part upward, the swing part rotates counterclockwise, and when the first connecting arm rotates to be collinear with the pulling direction of the tension spring, the mechanism enters the dead point state; continue to pull to make the first connecting arm pass the dead point, and the direction of the torque generated by the tension spring is switched to maintain the locking direction, so the blocking pin can remain in the extended state under the drive of the second connecting arm, and an additional locking pin can also be provided to prevent the traction part from retreating under the action of the tension spring, and the risk of misoperation of the outdoor switch is solved through a purely mechanical passive locking design. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of the medium load switch of the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the medium load switch of the utility model;

[0021] Figure 3 It is a structural diagram of the locking mechanism in the utility model;

[0022] Figure 4 It is a structural diagram of the energy storage operating mechanism in the utility model;

[0023] Figure 5 It is a structural diagram of the energy storage operating mechanism in the utility model;

[0024] Figure 6 It is a partial structural diagram of the energy storage operating mechanism in the utility model;

[0025] Figure 7 It is a structural diagram of the elastic clamping mechanism in the utility model.

[0026] Figure markings: 1. Shell; 2. Sealed pole; 3. Insulating pull rod; 4. Rotating shaft; 5. Operating handle; 6. Fixed seat; 7. Blocking pin; 8. Swinging member; 9. First connecting arm; 10. Second connecting arm; 11. Traction rod; 12. Tension spring; 13. Block rod; 14. Cover plate; 15. Side hole; 16. Movable hole; 17. Oblong hole; 18. Pin shaft; 19. Second tension spring; 20. Operating shaft; 21. First linkage swing arm; 22. First movable shaft; 23. Second linkage swing arm; 24. Second movable shaft; 25. Movable groove; 26. First tension spring; 27. First limit position; 28. Second limit position; 29. ​​Elastic clamping mechanism; 30. Tightening bayonet; 31. Active arm; 32. Clamping arm; 33. Traction arm; 34. Mounting frame; 35. Bridging arm. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments and drawings. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0028] The specific embodiments of the present utility model are described below with reference to the accompanying drawings.

[0029] like Figure 1-7The operating handle locking mechanism of a load switch shown in the figure includes a shell 1, several sealed poles 2 and an energy storage operating mechanism, a vacuum arc chamber is provided in the sealed pole 2, an insulating pull rod 3, a moving terminal and a static terminal are provided in the vacuum arc chamber, the energy storage operating mechanism links the insulating pull rods 3 through a rotating shaft 4 and the rotating shaft 4 is driven by an operating handle 5 to synchronously control the contact or separation of all moving terminals and static terminals, a locking mechanism is provided on the shell 1, including: a fixed seat 6, fixed or integrally formed on the shell 1; a blocking pin 7, slidingly penetrated through the fixed seat 6; a swinging member 8, pivotally connected to the shell 1, having a first connecting arm 9 and a second connecting arm 10; a traction rod 11, one end of which is hinged to the free end of the first connecting arm 9; a blocking rod 13, fixed to the operating handle 5, and its motion trajectory intersects with the axis of the blocking pin 7; the free end of the second connecting arm 10 is hinged to the blocking pin 7, and when the traction rod 11 is pulled in a controlled manner, the blocking pin 7 is driven to extend into the motion path of the blocking rod 13.

[0030] The user pulls the traction member upwards, and the swing member 8 rotates counterclockwise. When the first connecting arm 9 rotates to be collinear with the pulling direction of the tension spring 12, the mechanism enters a dead point state; continue to pull so that the first connecting arm 9 passes the dead point, and the direction of the torque generated by the tension spring 12 is switched to maintain the locking direction. Therefore, the blocking pin 7 can remain in the extended state under the drive of the second connecting arm 10. An additional locking pin can also be provided to prevent the traction member from retreating under the action of the tension spring 12. The risk of misoperation of the outdoor switch is solved through a purely mechanical passive locking design.

[0031] A V-shaped angle is formed between the first connecting arm 9 and the second connecting arm 10, and the angle is in the range of 60°-120°.

[0032] The outer side of the housing 1 is fixedly connected to a cover plate 14 , which includes: a side hole 15 for the blocking pin 7 to telescopically move; and a movable hole 16 for the traction rod 11 to pass through and axially move.

[0033] An oblong hole 17 is provided at the free end of the second connecting arm 10 , and the end of the blocking pin 7 is fixedly connected to a pin shaft 18 , and the pin shaft 18 is loosely fitted in the oblong hole 17 to form a floating hinge structure.

[0034] The energy storage operating mechanism includes: an operating shaft 20, pivotally connected to the housing 1 and connected to the operating handle 5; a first linkage swing arm 21, one end of which is fixed to the operating shaft 20 and the other end is connected to the first movable shaft 22; a second linkage swing arm 23, one end of which is pivotally connected to the operating shaft 20 and the other end is connected to the second movable shaft 24, and the second linkage swing arm 23 is driven and connected to the rotating shaft 4; a mounting frame 34, fixed in the housing 1, symmetrically provided with movable grooves 25 on both sides to constrain the movement path of the first movable shaft 22 or the second movable shaft 24; the first movable shaft A first tension spring 26 is connected between the movable shaft 22 and the second movable shaft 24; when the operating handle 5 drives the first movable shaft 22 to move to the first limit position 27 or the second limit position 28 of the movable groove 25, the second movable shaft 24 moves synchronously to the corresponding limit position under the action of the first tension spring 26, triggering the opening / closing action. In this embodiment, the movable groove 25 is an arc-shaped guide groove. In this embodiment, a bridging arm 35 is hinged in the middle of the second linkage swing arm 23, and the lower end of the bridging arm 35 is hinged to the rotating shaft 4. The rotating shaft 4 is flipped to drive the insulating pull rod 3 to open and close.

[0035] Mechanical control: Turn the operating handle 5 to realize manual opening and closing. After the first linkage swing arm 21 rotates to make the first movable shaft 22 run to the first limit position 27 or the second limit position 28, the first tension spring 26 is triggered to release instantly after the energy storage reaches the critical point, driving the second linkage swing arm 23 to rotate relative to the operating shaft 20 to make the second movable shaft 24 move synchronously to the first mechanical position or the second limit position 28. In the open state, the two movable shafts are both located at the first limit position 27. In the closed state, the two movable shafts are both located at the second limit position 28. The opening and closing operations can be realized quickly, easily and labor-savingly, and high-precision synchronization of the opening and closing actions can be achieved, which significantly improves the operational reliability and mechanical life. The operation is easy and labor-saving, and is suitable for smart grid pole-mounted equipment.

[0036] At least one of the two ends of the movable slot 25 is provided with an elastic clamping mechanism 29; the elastic clamping mechanism 29 includes: a tightening bayonet 30, configured to lock the first movable shaft 22 or the second movable shaft 24 that slides to the end of the movable slot 25; the width of the tightening bayonet 30 can be dynamically adjusted to adapt to the clamping or release of the first movable shaft 22 or the second movable shaft 24. In this embodiment, an elastic clamping mechanism 29 is respectively provided at both ends of the movable slot 25 corresponding to the side of the first linkage swing arm 21. The elastic clamping mechanism 29 dynamically clamps the movable shaft at the end of the movable slot 25, and achieves zero rebound locking after the switch is opened and closed.

[0037] The elastic clamping mechanism 29 also includes: an active arm 31, one end of which is pivotally connected to the mounting frame 34; a clamping arm 32, one end of which is pivotally connected to the mounting frame 34; a traction arm 33, both ends of which are pivotally connected to the free end of the active arm 31 and the free end of the clamping arm 32 respectively; a second tension spring 19, one end of which is connected to the mounting frame 34 and the other end is connected to the middle part of the active arm 31, driving the active arm 31 to swing toward the center of curvature of the movable slot 25.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention as claimed, and the scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A load switch operating handle locking mechanism, comprising a housing (1), a plurality of sealed poles (2), and an energy storage operating mechanism, wherein a vacuum interrupter is provided in the sealed pole (2), an insulating pull rod (3), a movable terminal, and a static terminal are provided in the vacuum interrupter, the energy storage operating mechanism links the insulating pull rods (3) via a rotating shaft (4), and the rotating shaft (4) is driven by an operating handle (5), so as to synchronously control the contact or separation of all movable terminals and static terminals, characterized in that: The housing (1) is provided with a locking mechanism, comprising: a fixed seat (6) connected to the housing (1); a blocking pin (7) slidably penetrated through the fixed seat (6); a swing member (8) pivotally connected to the housing (1) and having a first connecting arm (9) and a second connecting arm (10); a traction rod (11) with one end hinged to the free end of the first connecting arm (9); a tension spring (12) with one end connected to the housing (1) and the other end connected to the first connecting arm (9); a blocking rod (13) fixed to the operating handle (5), with a motion trajectory intersecting with the axis of the blocking pin (7); the free end of the second connecting arm (10) is hinged to the blocking pin (7), and when the traction rod (11) is pulled in a controlled manner, the blocking pin (7) is driven to extend into the motion path of the blocking rod (13).

2. The operating handle locking mechanism of the load switch according to claim 1, characterized in that: A V-shaped angle is formed between the first connecting arm (9) and the second connecting arm (10).

3. The operating handle locking mechanism of the load switch according to claim 1, characterized in that: The outer side of the housing (1) is fixedly connected to a cover plate (14), and the cover plate (14) comprises: a side hole (15) for the blocking pin (7) to telescopically move; and a movable hole (16) for the traction rod (11) to pass through and axially move.

4. The operating handle locking mechanism of the load switch according to claim 1, characterized in that: The free end of the second connecting arm (10) is provided with an oblong hole (17), the end of the blocking pin (7) is fixedly connected to a pin shaft (18), and the pin shaft (18) is loosely fitted in the oblong hole (17) to form a floating hinge structure.

5. The operating handle locking mechanism of the load switch according to claim 1, characterized in that: The energy storage operating mechanism comprises: an operating shaft (20), pivotally connected to the housing (1) and connected to the operating handle (5); a first linkage swing arm (21), one end of which is fixedly connected to the operating shaft (20) and the other end of which is connected to the first movable shaft (22); a second linkage swing arm (23), one end of which is pivotally connected to the operating shaft (20) and the other end of which is connected to the second movable shaft (24), and the second linkage swing arm (23) is drivingly connected to the rotating shaft (4); a mounting frame (34), fixed in the housing (1), with both sides of the mounting frame facing the rotating shaft (4). A movable groove (25) is provided for constraining the movement path of a first movable shaft (22) or a second movable shaft (24); a first tension spring (26) is connected between the first movable shaft (22) and the second movable shaft (24); when an operating handle (5) drives the first movable shaft (22) to move to a first limit position (27) or a second limit position (28) of the movable groove (25), the second movable shaft (24) moves synchronously to the corresponding limit position under the action of the first tension spring (26), thereby triggering an opening / closing action.

6. The operating handle locking mechanism of the load switch according to claim 5, characterized in that: The movable groove (25) is an arc-shaped guide groove.

7. The operating handle locking mechanism of the load switch according to claim 5, characterized in that: At least one of the movable slots (25) is provided with an elastic clamping mechanism (29) at both ends; the elastic clamping mechanism (29) comprises a tightening bayonet (30) configured to lock the first movable shaft (22) or the second movable shaft (24) that slides to the end of the movable slot (25); the width of the tightening bayonet (30) can be dynamically adjusted to adapt to the clamping or release of the first movable shaft (22) or the second movable shaft (24).

8. The operating handle locking mechanism of the load switch according to claim 7, characterized in that: The elastic clamping mechanism (29) further comprises: an active arm (31), one end of which is pivotally connected to a mounting frame (34); a clamping arm (32), one end of which is pivotally connected to the mounting frame (34); a traction arm (33), both ends of which are respectively pivotally connected to the free end of the active arm (31) and the free end of the clamping arm (32); and a second tension spring (19), one end of which is connected to the mounting frame (34) and the other end of which is connected to the middle of the active arm (31), driving the active arm (31) to swing toward the curvature center side of the movable slot (25).

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