Tripping mechanism and switchgear having the same

Abstract

The utility model relates to a kind of tripping mechanism and switch device with the tripping mechanism, the tripping mechanism includes executive member and energy storage elastic member, executive member is connected to moving contact component, for driving moving contact component to execute closing action or opening action, and the executive member is equipped with first cooperation part;Energy storage elastic member has deformation energy storage state and reset energy release state, define the deformation variable of energy storage elastic member in deformation energy storage state as energy storage stroke, it includes first end and second end, first end is limited in abutment in deformation energy storage state, second end is located in closing path and there is first stroke interval between first cooperation part in reset energy release state, first cooperation part first experiences first stroke interval again drive second end so that energy storage elastic member switches to deformation energy storage state, so that closing stroke is greater than the energy storage stroke of energy storage elastic member.Energy storage elastic member's storage capacity is reduced, the service life of energy storage elastic member is extended, the reliability of tripping mechanism and the safety of switch device are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of switchgear technology, specifically to a tripping mechanism and a switchgear having the tripping mechanism. Background Technology

[0002] Switchgear refers to the switchgear defined in GB / T 5226.1-2019 / IEC 60204-1:2016, that is, electrical appliances used to connect or disconnect one or more circuit currents. Specific component forms can be circuit breakers, relays, disconnecting switches, etc. Circuit breakers and disconnecting switches are usually equipped with a tripping mechanism for tripping. The tripping mechanism typically uses an energy-storing elastic element, such as a torsion spring, coil spring, or spring sheet, which utilizes the elastic force of the deformed energy-storing element to push the main shaft and moving contact to trip. Taking a torsion spring as an example, the existing torsion spring's torsional deformation angle is the same as the main shaft's rotation angle. This results in excessive torque during torsion spring deformation, which is detrimental to the design of the tripping mechanism. For example, it increases the burden on the limiting structure that maintains the torsion spring in its deformed, energy-storing state. Secondly, the torsion spring only releases its elastic force at the moment of tripping; in most cases, it remains in a deformed, energy-storing state. This reduces the torsion spring's lifespan and, after prolonged use, decreases the reliability of the tripping mechanism and reduces the safety of the switchgear. Summary of the Invention

[0003] The purpose of this utility model is to provide a tripping mechanism and a switching device having the tripping mechanism, so as to solve the problem that the energy storage torque of the energy storage elastic element of the existing tripping mechanism is too large.

[0004] To achieve the above objectives, the technical solution of this utility model includes: a tripping mechanism, comprising...

[0005] An actuator is connected to a moving contact component and is used to perform a closing operation or a opening operation to drive the moving contact component to perform a corresponding closing action or opening action. The actuator is fixedly provided with a first mating part. When the actuator performs a closing operation, the first mating part follows the movement of the actuator and has a closing path. The coverage area of ​​the closing path is defined as the closing stroke.

[0006] An energy storage elastic element is provided to drive the actuator to disengage. The energy storage elastic element has a deformable energy storage state and a reset energy release state. The deformation of the energy storage elastic element in the deformable energy storage state is defined as the energy storage stroke. It includes a first end and a second end. The first end is abutted and limited in the deformable energy storage state. The second end is located on the closing path in the reset energy release state and has a first stroke distance between it and the first mating part. The first mating part first travels through the first stroke distance and then drives the second end, causing the energy storage elastic element to switch to the deformable energy storage state. The first stroke distance makes the closing stroke of the first mating part greater than the energy storage stroke of the energy storage elastic element.

[0007] In one embodiment, the first end is stopped by a retaining portion of a fixing member in the deformable energy storage state. The release mechanism also includes a pre-tightening member. In the reset energy release state, the first end of the energy storage elastic member abuts the pre-tightening member, and there is a second stroke distance between the first end and the retaining portion. During the process of the energy storage elastic member switching from the reset energy release state to the deformable energy storage state, the first end disengages from the pre-tightening balance member and moves to the position abutting the retaining portion after passing through the second stroke distance. The second stroke distance and the first stroke distance work together to make the actuation stroke of the actuator greater than the energy storage stroke of the energy storage elastic member.

[0008] In one embodiment, the preload is an elastic preload elastic member, which includes a preload end for abutting and engaging with the first end. The preload end is disposed on the movement path of the first end during the second stroke distance. The deformation direction of the preload end is staggered with the movement path of the first end, so that the first end disengages from the preload end by means of this staggered arrangement, and thus disengages from the preload elastic member.

[0009] In one embodiment, the preload elastic element is a torsion spring, which is disposed on the fixed element, and one torsion arm of the torsion spring extends in the direction of the energy storage elastic element as the preload end.

[0010] In one embodiment, the energy storage elastic element is a torsion spring, the actuator is a turntable structure and is coaxially arranged with the energy storage elastic element, the first mating part protrudes along the axial direction of the actuator toward the energy storage elastic element, the second end of the energy storage elastic element is selectively arranged on the movement path of the first mating part, the first mating part drives the second end to move by means of the closing operation of the actuator, so that the energy storage elastic element deforms and stores energy; the limiting part is a boss structure provided on the fixing member, the limiting part is located on one side of the first end to form a limit on the first end in the deformed energy storage state.

[0011] In one embodiment, a trigger is further included. The trigger has a latching part, which is selectively disposed in the reset direction of the second end of the energy storage elastic member. The action of the trigger changes the latching part to abut or disengage from the second end, thereby selectively maintaining the energy storage elastic member in a deformed energy storage state. During the energy release and reset process, the energy storage elastic member pushes the first mating part to move and disengage.

[0012] In one embodiment, the trigger is a swing arm rotatably mounted on the fixed member. The swing arm swings under the action of the shunt trip unit, and the latching part abuts against or disengages from the second end as the swing arm swings.

[0013] In one embodiment, the actuator is a turntable structure, the actuator is provided with a second mating part, and one end of the swing arm is provided with a reset part protruding in the direction of the actuator. The reset part is selectively located on the opening path of the second mating part as the swing arm moves, so that the second mating part pushes the reset part by means of the movement of the actuator, thereby driving the swing arm to reset in the direction of abutting the second end.

[0014] The technical solution of this utility model also includes: a switching device, which includes the above-mentioned tripping mechanism.

[0015] In one embodiment, the switching device is a disconnecting switch or a circuit breaker.

[0016] The beneficial effects of this utility model are:

[0017] 1. This utility model sets a first stroke interval. The first mating part first travels through the first stroke interval before driving the second end to move. As the first mating part continues to rotate, it drives the second end to rotate, achieving the purpose of deforming and storing energy in the energy storage elastic element. This makes the energy storage stroke of the energy storage elastic element less than the closing stroke of the actuator. This can reduce the torque of the energy storage elastic element in the deformed energy storage state, thereby extending the service life of the energy storage elastic element, ensuring the reliability of the tripping mechanism and the safety of the switchgear; it can also reduce the burden on components such as the trigger element that are subjected to pressure from the energy storage elastic element for a long time.

[0018] 2. By setting the first stroke interval, the actuator will not be subjected to the rebound force from the energy storage elastic element in the initial stage of the closing operation, thereby reducing the initial driving force of the closing operation.

[0019] 3. The pre-tightening member keeps the first end in the reset and energy-releasing state away from the limit part, so that the first end and the limit part form a second stroke distance. By means of the second stroke distance, the difference between the closing stroke of the actuator and the energy storage stroke of the energy storage elastic member is larger, and the energy storage stroke of the energy storage elastic member is further reduced.

[0020] 4. The preload can also generate a rebound force on the actuator, reducing the movement speed of the actuator, thereby reducing the speed and noise of the moving contact component hitting the stationary contact component, which is beneficial to improving the life of the switchgear. Attached Figure Description

[0021] Figure 1 This is a perspective view of one embodiment of the present utility model.

[0022] Figure 2 This is a front view of an embodiment of the present utility model.

[0023] Figure 3 This is an exploded view of an embodiment of the present invention.

[0024] Figure 4 This is a partial component connection structure diagram of an embodiment of the present utility model, showing the energy storage elastic component in a deformable energy storage state.

[0025] Figure 5 This is a diagram showing the assembly of the actuator, energy storage elastic element, and pre-tightening elastic element according to an embodiment of the present invention. The energy storage elastic element is in a deformed energy storage state.

[0026] Figure 6 This is a partial component connection structure diagram of an embodiment of the present invention, showing the energy storage elastic element in a reset and energy release state.

[0027] Figure 7 This is a diagram showing the assembly of the actuator, energy storage elastic element, and pre-tightening elastic element according to an embodiment of this utility model. The energy storage elastic element is in a reset and energy release state.

[0028] Figure 8 This is a perspective view of the actuator, energy storage elastic element, and pre-tightening elastic element in accordance with an embodiment of this utility model.

[0029] Figure 9 This is a structural diagram of the trigger element according to an embodiment of the present invention.

[0030] Among them: 1. Actuator, 11. First mating part, 12. Closing limit point, 13. Opening limit point, 14. Second mating part, 2. Energy storage elastic element, 21. First end, 22. Second end, 3. Pre-tightening elastic element, 31. Third end, 32. Fourth end, 4. Fixing element, 41. Limiting structure, 42. Limiting part, 5. Trigger element, 51. Snap-on part, 52. Reset part, A1. First stroke distance, A2. Second stroke distance, S1. Closing stroke, S2. Energy storage stroke. Detailed Implementation

[0031] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0032] See Figures 1 to 3 As shown, this utility model discloses a tripping mechanism for use in switching electrical appliances, wherein the switching electrical appliance can be a disconnecting switch or a circuit breaker.

[0033] The tripping mechanism includes an actuator 1, an energy storage elastic element 2, and a pre-tensioning elastic element 3. The actuator 1 is connected to the moving contact element and is used to perform a closing or opening operation to drive the moving contact element to perform a corresponding closing or opening action. The actuator 1 is fixedly provided with a first mating part 11. When the actuator 1 performs a closing operation, the first mating part 11 follows the movement of the actuator 1 and has a closing path. The coverage area of ​​the closing path is defined as the closing stroke. Since the first mating part 11 is fixedly provided on the actuator 1, the closing stroke of the first mating part 11 is equal to the closing stroke S1 of the actuator 1. In this embodiment, the actuator 1 is a turntable structure, and the first mating part 11 is provided in its radial direction so that it moves along an arc-shaped trajectory as the turntable rotates. Therefore, the closing path of the first mating part 11 is arc-shaped. The actuator 1 also has a closing limit point 12 and a opening limit point 13, which are located on both sides of the first mating part 11, and respectively abut against the limiting structure 41 on the fixing member 4 to form a motion limit as the actuator 1 rotates. In this embodiment, the fixing member 4 is the upper cover of the circuit breaker, and the upper cover is provided with a plurality of bosses protruding towards the actuator 1. These bosses are respectively used to form the limiting structure 41 and the limiting part 42 described below.

[0034] In the tripping mechanism of this utility model, the energy storage elastic element 2 is used to drive the actuator 1 to trip. The energy storage elastic element 2 has a deformable energy storage state and a reset energy release state. The energy storage elastic element 2 is maintained in the deformable energy storage state or switched to the reset energy release state by the trigger element 5, and is also switched from the reset energy release state to the deformable energy storage state by the actuator 1. The energy storage elastic element 2 includes a first end 21 and a second end 22. In the deformable energy storage state, the first end 21 is abutted and limited, specifically, the first end 21 is abutted and limited by the limiting part 42 of the fixing member 4, and the second end 22 is limited by the latching part 51 of the trigger element 5. The trigger element 5 is a swing arm rotatably mounted on the fixing member 4. The swing arm swings under the action of the shunt trip device, and the latching part 51 abuts or disengages from the second end 22 with the swinging action of the swing arm. The shunt trip device is prior art. By means of the shunt trip unit’s power on and off, the latching part 51 is selectively positioned in the direction of movement of the second end 22 of the energy storage elastic member 2. The shunt trip unit causes the trigger member 5 to change its movement, causing the latching part 51 to abut against or disengage from the second end 22, thereby allowing the energy storage elastic member 2 to be selectively held in the deformed energy storage state. During the energy release and reset process, the energy storage elastic member 2 pushes the first mating part 11 to move and trip.

[0035] When tripping is required, the shunt trip unit is energized, causing the trigger element 5 to actuate and release the restriction on the second end 22 of the energy storage elastic element 2. The energy storage elastic element 2 switches from a deformed energy storage state to a reset energy release state. During the switching process, the second end 22 of the energy storage elastic element 2 pushes the first mating part 11 of the actuator 1 to actuate, thereby causing the actuator 1 to perform a tripping operation. When reclosing is required, the actuator 1 performs a closing operation under the action of the operating handle or other operating mechanism. During the closing operation of the actuator 1, the first mating part 11 pushes the second end 22 of the energy storage elastic element 2 to actuate, causing the energy storage elastic element 2 to switch from a reset energy release state to a deformed energy storage state.

[0036] See Figures 4 to 8As shown, the deformation of the energy storage elastic element 2 in the deformable energy storage state is defined as the energy storage stroke S2. In this embodiment, the energy storage elastic element 2 is a torsion spring, and the torsion spring is coaxially arranged with the actuator 1. Therefore, the energy storage stroke S2 ​​of the energy storage elastic element 2 is the difference between the angle between the first end 21 and the second end 22 in the deformable energy storage state and the reset energy release state. In the reset energy release state, the second end 22 is located on the closing path of the first mating part 11, and there is a first stroke gap A1 between the second end 22 and the first mating part 11. The first mating part 11 first passes through the first stroke gap A1 and then drives the second end 22, causing the energy storage elastic element 2 to switch to the deformable energy storage state. The first stroke gap A1 makes the closing stroke S1 of the first mating part 11 greater than the energy storage stroke S2 ​​of the energy storage elastic element 2. Therefore, in the reset and energy-releasing state, the second end 22 is used to operate under the drive of the first mating part 11 to switch the energy-storing elastic member 2 to the deformable energy-storing state, so as to drive the actuator 1 to operate and release when the energy is released and reset; in the deformable energy-storing state, the second end 22 is used to push the first mating part 11 to operate and drive the actuator 1 to perform the release action.

[0037] This invention features a first stroke gap A1. The first mating part 11 passes through the first stroke gap A1 before contacting the second end 22. The continuous rotation of the first mating part 11 drives the second end 22 to rotate, causing the energy storage elastic element 2 to deform and store energy. Due to the existence of the first stroke gap A1, the energy storage stroke S2 ​​of the energy storage elastic element 2 is less than the closing stroke S1 of the actuator 1. This reduces the torque of the energy storage elastic element 2 in the deformed energy storage state, thereby extending the service life of the energy storage elastic element 2, ensuring the reliability of the tripping mechanism and the safety of the switching device; it also reduces the burden on components such as the trigger element 5 that are subjected to the pressure of the energy storage elastic element 2 for extended periods. Furthermore, by setting the first stroke gap A1, the actuator 1 will not experience a rebound force from the energy storage elastic element 2 during the initial stage of the closing operation, thus reducing the initial driving force of the closing operation.

[0038] The tripping mechanism also includes a pre-tensioning element. In this embodiment, the pre-tensioning element is a pre-tensioning elastic element 3, more specifically, a torsion spring. One torsion arm of the torsion spring serves as the pre-tensioning end 31, and the other torsion arm is a fixed end 32. In the reset and energy-releasing state, the first end 21 of the energy-storing elastic element 2 abuts against the pre-tensioning end 31, and there is a second stroke distance A2 between the first end 21 and the limiting part 42. During the process of switching the energy-storing elastic element 2 from the reset and energy-releasing state to the deformed energy-storing state, the first end 21 disengages from the pre-tensioning end 31 of the pre-tensioning elastic element 3 and moves to the position abutting against the limiting part 42 after passing through the second stroke distance A2. The second stroke distance A2 and the first stroke distance A1 work together to make the closing stroke S1 of the actuator 1 greater than the energy-storing stroke S2 ​​of the energy-storing elastic element 2. The fixed end 32 is fixedly disposed in a groove of the fixing part 4. In other embodiments, the fixed end 32 can also be fixedly connected to other fixing structural members.

[0039] In this embodiment, the pre-tightening elastic element 3 is a torsion spring structure, and its pre-tightening end 31 is disposed on the movement path of the first end 21 during the second stroke distance A2, so as to abut against the first end 21 of the energy storage elastic element 2. The deformation direction of the pre-tightening end 31 is staggered with the movement path of the first end 21, so that the first end 21 disengages from the pre-tightening end 31 by means of this staggered arrangement, and then disengages from the pre-tightening element 3. More specifically, when the second end 22 of the energy storage elastic element 2 moves under the thrust of the actuator 1, the first end 21 remains stationary due to the limitation of the pre-tightening end 31. The pre-tightening end 31 continues to deform and gradually increases its elastic force as the actuator 1 continues to move. This elastic force acts on the pre-tightening end 31 through the first end 21 and pushes the pre-tightening end 31 to move, causing the pre-tightening elastic element 3 to deform until the pre-tightening end 31 disengages from the first end 21. Under the elastic deformation of the energy storage elastic element 2, the first end 21 moves toward the direction of the limiting part 42, passes through the second stroke distance A2 until it abuts against the limiting part 42. The second end 22 continues to move with the actuator 1 until the closing limiting point 12 of the actuator 1 abuts against the limiting structure 41.

[0040] This invention uses a pre-tightening member to keep the first end 21 in the reset and energy-releasing state away from the limiting part 42, so that the first end 21 and the limiting part 42 form a second stroke distance A2. By means of the second stroke distance A2, the difference between the closing stroke S1 of the actuator 1 and the energy storage stroke S2 ​​of the energy storage elastic member 2 is made larger, and the energy storage stroke S2 ​​of the energy storage elastic member 2 is further reduced.

[0041] Furthermore, the provision of a pre-tightening elastic element 3 can also improve the lifespan of the switchgear with the tripping mechanism. The specific analysis is as follows: (1) If a pre-tightening balance element, such as the pre-tightening elastic element 3, is not provided, the energy storage elastic element 2 will rotate synchronously with the actuator 1 when its second end 22 is pushed by the first mating part 11. At this time, the energy storage elastic element 2 does not undergo elastic deformation, and the first end 21 directly abuts against the limiting part 42 through the second stroke distance A2. The actuator 1 will not be subjected to the rebound force from the energy storage elastic element 2 within the range of the second stroke distance A2. This is equivalent to the actuator 1 and the energy storage elastic element 2 forming a stroke distance of the first stroke distance A1 plus the second stroke distance A2. The actuator 1, along with the moving contact component, is fully accelerated within this stroke distance, ultimately causing the moving contact component to strike the stationary contact component at a large speed, resulting in high noise and a shortened lifespan for both components. (2) If the pre-tightening elastic element 3 is not provided, the second stroke distance A2 can be eliminated, that is, the first end 21 always remains in contact with the limiting part 42. If the energy storage stroke S2 ​​of the energy storage elastic element 2 is to be kept unchanged, then the first stroke distance A1 should be increased. At this time, the force on the actuator 1 is the same as the above analysis. The actuator 1 is fully accelerated within the increased first stroke distance A1 range, which ultimately causes the moving contact part to hit the stationary contact part at a large speed, resulting in high noise and a shortened lifespan for both. Therefore, providing the pre-tightening elastic element 3 can reduce the speed and noise of the moving contact part hitting the stationary contact part, which is beneficial to improving the lifespan of the switching device.

[0042] The actuator 1 is a turntable structure. The energy storage elastic element 2 and the preload elastic element 3 are both torsion springs. The closing stroke S1, the energy storage stroke S2, the first stroke distance A1, and the second stroke distance A2 are all angles. The specific angles are set by those skilled in the art based on the structure of the switchgear. For example, the closing stroke S1 of the actuator 1 is 90°, the energy storage stroke S2 ​​is 65°, the first stroke distance A1 is 10°, and the second stroke distance A2 is 15°. Of course, the angles can also be other values, which are determined by those skilled in the art based on the product structure. Taking the above angle as an example, the energy storage operation process of the tripping mechanism includes: when the actuator 1 is manually rotated, the actuator 1 rotates by 10° of the first stroke distance A1, the first mating part 11 engages with the second end 22 of the energy storage elastic element 2, and drives the second end 22 to rotate around the actuator 1. At this time, the energy storage elastic element 2 begins to store energy; when the actuator 1 rotates a certain angle, the force on the first end 21 of the energy storage elastic element 2 is greater than the rebound force of the pre-tightening end 31 of the pre-tightening elastic element 3, and the first end 21 of the energy storage elastic element 2 drives the pre-tightening end 31 of the pre-tightening elastic element 3 to rotate. The pre-tightening end 31 of the elastic member 3 rotates together until the two separate and the first end 21 of the energy storage elastic member 2 is engaged with the limiting part 42. At this time, the first end 21 of the energy storage elastic member 2 rotates at an angle of 15°, which is the second stroke distance A2. After the first end 21 of the energy storage elastic member 2 is fixed, the actuator 1 drives the second end 22 of the energy storage elastic member 2 to continue to rotate. When the actuator 1 rotates 90°, which is the closing stroke S1, the second end 22 of the energy storage elastic member 2 abuts against the latching part 51 of the trigger member 5. At this time, the energy storage elastic member 2 completes energy storage.

[0043] In other embodiments, the actuator 1 may also be a structure other than a turntable structure, such as a push rod, which drives the moving contact component to move by translation.

[0044] In the above embodiments, the energy storage elastic element 2 and the pre-tensioning elastic element 3 are both torsion springs, but are not limited to this. The energy storage elastic element 2 can also be a helical spring, with the first end 21 and the second end 22 being the two axial ends of the helical spring, respectively. The pre-tensioning elastic element 3 can also be a spring sheet, with the pre-tensioning end 31 and the fixed end 32 being its two ends, respectively. The type of spring that the energy storage elastic element 2 and the pre-tensioning elastic element 3 are used with is not limited, and can be a combination of a torsion spring and a spring sheet.

[0045] Furthermore, the pre-tensioning member is not limited to the elastic pre-tensioning member 3, but can also be a balancing boss protruding from the fixing member 1. This balancing boss is located at the end of the first end 21, and the strength of the fit between the balancing boss and the first end 21 is relatively small, allowing the first end 21 to detach from the balancing boss and move to the position of the limiting part 42 when the energy storage elastic member 2 is deformed under force. To make it easier for the first end 21 to detach from the balancing boss, the surface of the balancing boss facing the first end 21 can be a slope or an arc surface, which can both provide some obstruction to the first end 21 and allow it to detach from the balancing boss when the first end 21 is subjected to greater force.

[0046] See Figure 1 , Figure 2 and Figure 9 As shown, the actuator 1 is provided with a second mating part 14, and one end of the trigger 5 of the rocker arm structure is provided with a reset part 52 protruding in the direction of the actuator 1. The reset part 52 is selectively located on the opening path of the second mating part 14 as the rocker arm moves (the reset part 52 shown by the dotted line in the figure refers to the trajectory of the reset part 52 during the movement). Thus, the second mating part 14 pushes the reset part 52 by means of the opening operation of the actuator 1, thereby driving the rocker arm to reset in the direction of abutting the second end 22. During tripping, the actuator 1 moves in the opening direction, and the movement path of the second mating part 14 in this process is the opening path. The rocker arm swings under the action of the shunt trip device, and at the same time, the reset part 52 swings to the opening path of the second mating part 14. During tripping, the second mating part 14 hits the reset part 52, thereby pushing the rocker arm to reset, so that the rocker arm can perform the next tripping.

[0047] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that the remaining undescribed parts are prior art, and that all changes in form and detail made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims fall within the protection scope of the present invention.

Claims

1. A tripping mechanism, characterized in that: include An actuator is connected to a moving contact component and is used to perform a closing operation or a opening operation to drive the moving contact component to perform a corresponding closing action or opening action. The actuator is fixedly provided with a first mating part. When the actuator performs a closing operation, the first mating part follows the movement of the actuator and has a closing path. The coverage area of ​​the closing path is defined as the closing stroke. An energy storage elastic element is provided to drive the actuator to disengage. The energy storage elastic element has a deformable energy storage state and a reset energy release state. The deformation of the energy storage elastic element in the deformable energy storage state is defined as the energy storage stroke. It includes a first end and a second end. The first end is abutted and limited in the deformable energy storage state. The second end is located on the closing path in the reset energy release state and has a first stroke distance between it and the first mating part. The first mating part first travels through the first stroke distance and then drives the second end, causing the energy storage elastic element to switch to the deformable energy storage state. The first stroke distance makes the closing stroke of the first mating part greater than the energy storage stroke of the energy storage elastic element.

2. A trip unit according to claim 1, wherein: In the deformable energy storage state, the first end abuts against the limiting part of a fixed member and is limited. The release mechanism also includes a pre-tightening member. In the reset energy release state, the first end of the energy storage elastic member abuts against the pre-tightening member, and there is a second stroke distance between the first end and the limiting part. During the process of the energy storage elastic member switching from the reset energy release state to the deformable energy storage state, the first end disengages from the pre-tightening balance member and moves to the position abutting against the limiting part through the second stroke distance. The second stroke distance and the first stroke distance work together to make the actuation stroke of the actuator greater than the energy storage stroke of the energy storage elastic member.

3. A trip unit according to claim 2 wherein: The pre-tightening member is an elastic pre-tightening member, which includes a pre-tightening end for abutting and engaging with the first end. The pre-tightening end is disposed on the movement path of the first end during the second stroke distance. The deformation direction of the pre-tightening end is staggered with the movement path of the first end, so that the first end can disengage from the pre-tightening end by means of this staggered arrangement, and thus disengage from the pre-tightening member.

4. A trip unit according to claim 3 wherein: The preload elastic element is a torsion spring, which is mounted on the fixed element. One torsion arm of the torsion spring serves as the preload end and protrudes in the direction of the energy storage elastic element.

5. A trip unit according to claim 1 wherein: The energy storage elastic element is a torsion spring, and the actuator is a turntable structure coaxially arranged with the energy storage elastic element. The first mating part protrudes along the axial direction of the actuator toward the energy storage elastic element. The second end of the energy storage elastic element is selectively arranged on the movement path of the first mating part. The first mating part drives the second end to move by means of the closing operation of the actuator, so that the energy storage elastic element deforms and stores energy. The limiting part is a boss structure provided on the fixing member. The limiting part is located on one side of the first end to form a limit on the first end in the deformable energy storage state.

6. A trip unit according to claim 1 wherein: It also includes a trigger, which has a latching part. The latching part is selectively disposed in the reset direction of the second end of the energy storage elastic member. By changing the action of the trigger, the latching part abuts against or disengages from the second end, thereby allowing the energy storage elastic member to be selectively held in a deformed energy storage state. During the energy release and reset process, the energy storage elastic member pushes the first mating part to move and disengage.

7. A tripping mechanism according to claim 6, characterized in that: The trigger is a swing arm rotatably mounted on a fixed part. The swing arm swings under the action of the shunt trip device, and the latching part abuts against or disengages from the second end as the swing arm swings.

8. A tripping mechanism according to claim 7, characterized in that: The actuator is a turntable structure. The actuator is provided with a second mating part. One end of the swing arm is provided with a reset part that protrudes in the direction of the actuator. The reset part is selectively located on the opening path of the second mating part as the swing arm moves. Thus, the second mating part pushes the reset part by means of the actuator, thereby driving the swing arm to reset in the direction of abutting the second end.

9. Switched electrical apparatus, characterised in that: Includes the tripping mechanism as described in any one of claims 1-8.

10. The switching device according to claim 9, characterized in that: The switchgear is a disconnector or circuit breaker.

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