Linkage mechanism and surge protector

Abstract

The utility model relates to the field of surge protector equipment, in particular to a linkage mechanism and a surge protector. The linkage mechanism provided by the utility model is used for backup protection of a surge protector and comprises a movable contact, a trigger assembly and a connecting rod assembly, in a first direction, the movable contact is provided with a first abutting surface parallel to the first direction, the trigger assembly is provided with a second abutting surface parallel to the first direction, and the connecting rod assembly is provided with a second abutting surface parallel to the second direction. The connecting rod assembly is provided with a third abutting face and a fourth abutting face which are parallel to the first direction, the third abutting face can move along with the connecting rod assembly in the first direction to abut against the first abutting face, and the fourth abutting face can move along with the connecting rod assembly in the first direction to abut against the second abutting face.

Description

Technical Field

[0001] The utility model relates to the field of surge protector devices, and in particular to a linkage mechanism and a surge protector. Background Art

[0002] To achieve the active breaking function of the backup protection disconnector of the surge protector, currently, the backup protection disconnector of the surge protector controls the electromagnetic release to act through a current transformer. The action side of the electromagnetic release is then coordinated with a moving contact within a spacer structure arranged on the grounding loop through a linkage mechanism. For example, a hooking and slotting cooperation method is adopted to restrict the moving contact, preventing the moving contact from moving away from the contacts at both ends of the spacer structure under the action of the breaking spring. When the active breaking action is triggered, the electromagnetic release drives the hook to disengage from the moving contact, causing the moving contact to move away from the grounding loop, thereby disconnecting the grounding loop.

[0003] The problem with the above solution is that after the introduction of the linkage mechanism in the existing backup protection device, the linkage mechanism includes multiple components for realizing the transmission of actions between the triggering component and the moving contact, enabling a relatively small restraint force of the triggering component to balance the relatively large elastic force of the breaking spring. The introduction of the linkage mechanism increases a lot of components in the backup protection device of the surge protector, resulting in complex assembly. Summary of the Utility Model

[0004] On the one hand, the utility model provides a linkage mechanism, which can simplify the assembly of the backup protection disconnector after the introduction of the linkage mechanism;

[0005] On the other hand, the utility model provides a surge protector.

[0006] The linkage mechanism provided by the utility model is used for the backup protection of the surge protector and includes a moving contact, a triggering component, and a connecting rod component. Along the first direction, the moving contact has a first abutting surface parallel to the first direction, the triggering component has a second abutting surface parallel to the first direction, the connecting rod component has a third abutting surface and a fourth abutting surface parallel to the first direction. The third abutting surface can move along the first direction with the connecting rod component to abut against the first abutting surface, and the fourth abutting surface can move along the first direction with the connecting rod component to abut against the second abutting surface.

[0007] Furthermore, the connecting rod component includes a positioning component for keeping the third abutting surface and the fourth abutting surface in a matching position.

[0008] Further, the linkage mechanism further includes a first housing and a second housing. The link assembly is connected to the first housing through a third rotating shaft. The moving contact and the triggering assembly are connected to the second housing. The positioning assembly includes a first positioning member and a second positioning member both fixedly connected to the housing. The first positioning member and the second positioning member are located within a spacing structure formed on the link assembly, and respectively abut against the end faces at both ends of the spacing structure along the circumferential direction of the third rotating shaft. A through port is provided on the first housing, and a push rod is provided on the second housing. The push rod can pass through the through port to abut against the first positioning member and push the first positioning member away from the link assembly.

[0009] Further, the link assembly includes a third link member. The third link member is connected to the first housing through the third rotating shaft. The third link member has a first part of the third link and a second part of the third link that are circumferentially spaced along the third rotating shaft. The fourth abutting surface is located on the first part of the third link. The lever arm length of the first part of the third link is greater than the lever arm length of the second part of the third link.

[0010] Further, the spacing structure is formed between the first part of the third link and the second part of the third link.

[0011] Further, the link assembly includes a first link member and a second link member both connected to the first housing. The first link member has a first part of the first link and a second part of the first link that are circumferentially arranged on the same side of the first rotating shaft. The lever arm length of the first part of the first link is less than the lever arm length of the second part of the first link. The second link member has a first part of the second link and a second part of the second link that are circumferentially arranged. The first part of the first link abuts against the second part of the second link. The first part of the second link abuts against the first abutting surface and rotates to disengage. The second part of the first link abuts against the second part of the third link.

[0012] Further, the lever arm length of the first part of the second link is less than the lever arm length of the second part of the second link.

[0013] Further, the triggering assembly includes a bracket member and a movable member. The movable member is adsorbed and cooperated with the bracket member through the magnetic field force of a permanent magnet. A coil assembly is sleeved on the bracket member. The coil assembly is electrically connected to a mutual inductor sleeved on a grounding line. The second abutting surface is provided on the movable member.

[0014] Further, the fourth abutting surface rotates with the first part of the third link to disengage from the second abutting surface.

[0015] The surge protector provided by the present utility model includes a lightning protection element, and the moving contact in the linkage mechanism described in any one of the above and the lightning protection element are connected in series on the grounding loop.

[0016] Beneficial effects

[0017] To solve the problem of complex assembly after introducing the linkage mechanism, in this solution, the connecting rod assembly that realizes the linkage between the moving contact and the triggering component forms a relatively independent integrated component. The connecting rod assembly realizes the cooperation with the moving contact through the third abutting surface and realizes the cooperation with the triggering component through the fourth abutting surface. When performing the cooperation, the integrated component where the connecting rod assembly is located is assembled with the moving contact and the triggering component along the first direction. Since the first abutting surface for the moving contact to cooperate with the connecting rod assembly is parallel to the first direction, and the second abutting surface for the triggering component to cooperate with the connecting rod assembly is also parallel to the first direction, and the corresponding third abutting surface and fourth abutting surface of the connecting rod assembly are also parallel to the first direction, the third abutting surface and the fourth abutting surface as the action input and output ends can move along the first direction with the integrated component where the connecting rod assembly is located to abut against the first abutting surface and the second abutting surface, thereby realizing the access of the connecting rod assembly. Description of the drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of the cooperation between the connecting rod assembly and the moving contact and the triggering component provided in the first embodiment of the present utility model;

[0020] Figure 2 It is a partial structural schematic diagram of the connecting rod assembly provided in the first embodiment and the second embodiment of the present utility model;

[0021] Figure 3 It is a schematic diagram of the cooperation between the third connecting rod and the positioning component provided in the first embodiment of the present utility model;

[0022] Figure 4 It is a structural schematic diagram of the triggering component provided in the first embodiment and the second embodiment of the present utility model.

[0023] Reference numerals: 1 - moving contact; 2 - trigger assembly; 3 - connecting rod assembly; 4 - first abutting surface; 5 - second abutting surface; 6 - third abutting surface; 7 - fourth abutting surface; 8 - first part of the second connecting rod; 9 - second part of the second connecting rod; 10 - first part of the first connecting rod; 11 - second part of the first connecting rod; 12 - first part of the third connecting rod; 13 - second part of the third connecting rod; 14 - spacing structure; 15 - through port; 16 - push rod; 17 - first positioning member; 18 - second positioning member; 19 - bracket; 20 - movable member; 21 - coil assembly; 22 - hook. Detailed implementation manners

[0024] The following further elaborates on the detailed implementation manners of the present utility model with reference to the accompanying drawings. It should be understood that the detailed implementation manners described herein are only for the purpose of illustration and explanation of the present utility model, and are not intended to limit the present utility model.

[0025] Embodiment 1

[0026] As Figures 1 to 4 shown, a linkage mechanism for the backup protection of a surge protector includes a moving contact 1, a trigger assembly 2, and a connecting rod assembly 3. In the first direction, the moving contact 1 has a first abutting surface 4 parallel to the first direction, the trigger assembly 2 has a second abutting surface 5 parallel to the first direction, and the connecting rod assembly 3 has a third abutting surface 6 and a fourth abutting surface 7 parallel to the first direction. The third abutting surface 6 can move along the first direction with the connecting rod assembly 3 to abut against the first abutting surface 4, and the fourth abutting surface 7 can move along the first direction with the connecting rod assembly 3 to abut against the second abutting surface 5.

[0027] To solve the problem of the coordination between the restraint force of the electromagnetic release serving as the trigger component 2 and the elastic force of the breaking spring of the moving contact 1 in the active breaking scheme of the backup protection, a linkage mechanism is introduced in the existing backup protection device. The linkage mechanism includes multiple components and is used to achieve the transmission of motion between the trigger component 2 and the moving contact 1, so that the relatively small restraint force of the trigger component 2 can balance the relatively large elastic force of the breaking spring. The introduction of the linkage mechanism adds many components to the backup protection device of the surge protector, resulting in complex assembly. To solve the problem of complex assembly of the backup protection device with the introduced linkage mechanism, in this solution, the connecting rod assembly 3 that realizes the linkage between the moving contact 1 and the trigger component 2 is formed into a relatively independent integrated component. The connecting rod assembly 3 is fitted with the moving contact 1 through the third abutting surface 6 and with the trigger component 2 through the fourth abutting surface 7. When fitting, the integrated component where the connecting rod assembly 3 is located is assembled with the moving contact 1 and the trigger component 2 along the first direction. Since the first abutting surface 4 of the moving contact 1 for fitting with the connecting rod assembly 3 is parallel to the first direction, and the second abutting surface 5 of the trigger component 2 for fitting with the connecting rod assembly 3 is also parallel to the first direction, the corresponding third abutting surface 6 and fourth abutting surface 7 of the connecting rod assembly 3 are also parallel to the first direction. Therefore, the third abutting surface 6 and the fourth abutting surface 7 serving as the action input and output ends can move along the first direction with the integrated component where the connecting rod assembly 3 is located to abut against the first abutting surface 4 and the second abutting surface 5, thus realizing the access of the connecting rod assembly 3.

[0028] In an alternative embodiment, the connecting rod assembly 3 includes a positioning component that positions the third abutting surface 6 and the fourth abutting surface 7 in the mating position.

[0029] The function of the positioning component is to keep the connecting rod assembly 3 in the mating state when the connecting rod assembly 3 is not fitted with the moving contact 1 and the trigger component 2. Thus, when the connecting rod assembly 3 is inserted into the backup protection device where the moving contact 1 and the trigger component 2 are located along the first direction, its third abutting surface 6 and fourth abutting surface 7 are at an angle that can abut against the first abutting surface 4 and the second abutting surface 5.

[0030] The connecting rod assembly 3 is used to achieve the transmission of motion between the trigger component 2 and the moving contact 1 and includes multiple components. When the connecting rod assembly 3 is not fitted with the moving contact 1 and the trigger component 2, the connecting rod assembly 3 is not subjected to the restraint force of the trigger component 2 and the elastic force of the breaking spring of the moving contact 1. Therefore, the components of the connecting rod assembly 3 are in a state where they can move. To facilitate the assembly of the connecting rod assembly 3, the positioning component mates with one or more components of the connecting rod assembly 3 within the integrated component where the connecting rod assembly 3 is located to prevent them from moving.

[0031] The positioning component can disengage from the components of the connecting rod assembly 3 after the connecting rod assembly 3 is fitted with the trigger component 2 and the moving contact 1.

[0032] In an alternative embodiment, the linkage mechanism further includes a first housing and a second housing. The link assembly 3 is connected to the first housing through a third rotating shaft, and the moving contact 1 and the trigger assembly 2 are connected to the second housing. The positioning assembly includes a first positioning member 17 and a second positioning member 18 both fixedly connected to the housing. The first positioning member 17 and the second positioning member 18 are located within a spacing structure 14 formed on the link assembly 3 and respectively abut against the two end faces of the spacing structure 14 along the circumferential direction of the third rotating shaft. A through port 15 is provided on the first housing, and a push rod 16 is provided on the second housing. The push rod 16 can pass through the through port 15 to abut against the first positioning member 17 and push the first positioning member 17 away from the link assembly 3.

[0033] The link assembly 3 is located within the first housing, forming a relatively independent integrated component. The third abutting surface 6 and the fourth abutting surface 7 extend out from the first housing. The moving contact 1 and the trigger assembly 2 are located within the second housing, forming an integrated component of the backup protection device. When assembling the link assembly 3, the first housing is fitted with the second housing along the first direction, and the second housing and the first housing are fixed by screws or snaps. When the first housing is assembled, the third abutting surface 6 and the fourth abutting surface 7 extending out of the first housing can move along the first direction with the first housing to contact the first abutting surface 4 and the second abutting surface 5 and abut against each other after relative sliding occurs at the end faces.

[0034] The positioning assembly includes a first positioning member 17 and a second positioning member 18 both fixedly connected to the housing. The link assembly 3 is connected within the first housing through a third rotating shaft. A spacing structure 14 is formed on a component of the link assembly 3. The first positioning member 17 and the second positioning member 18 are fixedly connected to the first housing and are located within the spacing structure 14, respectively abutting against the two end faces of the spacing structure 14 along the circumferential direction of the third rotating shaft. That is, the first positioning member 17 and the second positioning member 18 impose a constraint on the link assembly 3 along its rotating direction, causing it to remain at an angle where the third abutting surface 6 and the fourth abutting surface 7 can abut against each other.

[0035] Since the movement of the moving contact 1 is unidirectional, when the link assembly 3 cooperating with the moving contact 1 has no constraint force provided by the trigger assembly 2, it also rotates unidirectionally with the moving contact 1, and the first positioning member 17 imposes a constraint on the link assembly 3 along its rotating direction.

[0036] Preferably, the first positioning member 17 is inclined with respect to the first direction, and a push surface is provided on the side facing the through port 15. When the first housing is fitted with the second housing along the first direction, the push rod 16 on the second housing passes through the through port 15 on the first housing and enters the first housing, abuts against the push surface of the first positioning member 17, and continues to push the push surface along the first direction, causing the first positioning member 17 to deform and disengage from the end face of the spacing structure 14.

[0037] After the first positioning member 17 is disengaged from the link assembly 3, the link assembly 3 remains in a non-rotating state due to the balance of the acting forces of the moving contact 1 and the trigger assembly 2. When the backup protection device triggers a backup protection action, since the restraining force of the trigger assembly 2 disappears, the link assembly 3 rotates accordingly under the action of the breaking spring of the moving contact 1. Since the first positioning member 17 is disengaged from the link assembly 3, the link assembly 3 rotates, and the second positioning member 18 disengages and gradually moves away from the end face of the spacing structure 14 that it abuts against, gradually approaches the end face of the spacing structure 14 that the original first positioning member 17 abuts against, and finally abuts against it, realizing a limited-angle rotation of the link assembly 3.

[0038] In an alternative embodiment, the link assembly 3 includes a third link member. The third link member is connected to the first housing through a third rotating shaft. The third link member has a first part of the third link 12 and a second part of the third link 13 that are circumferentially spaced along the third rotating shaft. The fourth abutting surface 7 is located on the first part of the third link 12, and the lever arm length of the first part of the third link 12 is greater than the lever arm length of the second part of the third link 13.

[0039] The lever arm length refers to the length between the mating position of the third link and the third rotating shaft. Since the fourth abutting surface 7 is located on the first part of the third link 12, the lever arm length of the first part of the third link 12 refers to the distance between the fourth abutting surface 7 and the third rotating shaft; the lever arm length of the first part is greater than the lever arm length of the second part of the third link 13. For the trigger assembly 2, the first part of the third link 12 and the second part of the third link 13 form a labor-saving lever model. Therefore, a relatively small restraining force generated by the trigger assembly 2 can balance the relatively large elastic force generated by the breaking spring.

[0040] In an alternative embodiment, a spacing structure 14 is formed between the first part of the third link 12 and the second part of the third link 13.

[0041] The second positioning member 18 abuts against the first part of the third link 12, and the first positioning member 17 abuts against the second part of the third link 13. The first part of the third link 12 abuts against the second abutting surface 5 of the trigger assembly 2 through the fourth abutting surface 7, and the second part of the third link 13 abuts against the first abutting surface 4 of the moving contact 1 through the third abutting surface 6; as the third link rotates, the hook 22 provided with the second abutting surface 5 on the trigger assembly 2 gradually slides to the end of the first part of the third link 12 and finally disengages; the hook body provided with the first abutting surface 4 on the moving contact 1 gradually slides to the end of the second part of the third link 13 and finally disengages.

[0042] To ensure the breaking effect of the grounding circuit, the moving contact 1 has a relatively large stroke so that the moving contact 1 can completely disengage from the contacts on both sides of the breaking gap in the grounding circuit. Correspondingly, the triggering component 2 also needs a relatively large stroke to cooperate with the moving contact 1. In this solution, the triggering component 2 disengages after the third link rotates a certain angle. The moving contact 1 is designed in the same way. Therefore, the stroke design of the triggering component 2 only needs to cooperate with the stroke of the moving contact 1 before disengagement, and a relatively small stroke of the triggering component 2 can be designed. After disengagement, the moving contact 1 moves relatively independently without driving the third link to rotate, and the triggering component 2 no longer moves accordingly.

[0043] Embodiment 2

[0044] In an optional implementation manner, the link assembly 3 includes a first link member and a second link member both connected to the first housing. The first link member has a first link first part 10 and a first link second part 11 arranged circumferentially along the first rotating shaft and on the same side of the first rotating shaft. The lever arm length of the first link first part 10 is less than that of the first link second part 11. The second link member has a second link first part 8 and a second link second part 9 arranged circumferentially along the second rotating shaft. The first link first part 10 abuts against the second link second part 9. The second link first part 8 abuts against the first abutting surface 4 and rotates to disengage. The first link second part 11 abuts against the third link second part 13.

[0045] On the transmission path from the moving contact 1 to the triggering component 2, the link assembly 3 successively has a second link member, a first link member, and a third link member. Among them, a third abutting surface 6 is provided at the end of the second link first part 8 with a shorter lever arm of the second link member, which abuts against the first abutting surface 4 on the moving contact 1. The end of the second link second part 9 with a longer lever arm of the second link member abuts against the end of the first link first part 10 with a shorter lever arm of the first link member. The end of the first link second part 11 with a longer lever arm of the first link member abuts against the third link second part 13 of the third link member. A fourth abutting surface 7 is provided at the end of the third link first part 12 of the third link member, which abuts against the second abutting surface 5 of the triggering component 2.

[0046] The lever arm length of the second link first part 8 is less than that of the second link second part 9. For the triggering component 2, the second link first part 8 and the second link second part 9 form a force-saving lever model. Therefore, the relatively small restraint force generated by the triggering component 2 can balance the relatively large elastic force generated by the breaking spring.

[0047] The first link part 10 and the second link part 11 of the first link member are located on the same side of the first rotating shaft. It means that when the first link member rotates with the movement of the follower contact 1, the first link part 10 moves, and the second link part 11 can push the cooperating component to move in the same direction. The lever arm length of the first link part 10 is less than that of the second link part 11. The first link part 10 and the second link part 11 form a force-saving lever model. Therefore, the smaller restraint force generated by the trigger assembly 2 can balance the larger elastic force generated by the breaking spring.

[0048] In an alternative embodiment, the trigger assembly 2 includes a bracket 19 and a movable member 20. The movable member 20 and the bracket 19 are adsorbed and cooperated through the magnetic field force of a permanent magnet. A coil assembly 21 is sleeved on the bracket 19. The coil assembly 21 is electrically connected to a current transformer sleeved on the grounding line. A second abutting surface 5 is provided on the movable member 20.

[0049] The bracket 19 is C-shaped with an opening on one side. Both sides of the opening have abutting ends. The permanent magnet magnetizes the bracket 19, and the two abutting ends adsorb the movable member 20 to abut against it under the magnetic field action, that is, the movable member 20 maintains a fixed relative position. The third link member that abuts against the hook 22 on the movable member 20 cannot rotate either. Furthermore, the cooperating first link member and second link member cannot rotate either, generating a binding force on the moving contact 1.

[0050] The coil assembly 21 is sleeved on the bracket 19, and its wire is connected to the secondary side of the current transformer. The current transformer is sleeved on the grounding loop. When the calibrated current flows through the grounding loop, the current generated by the current transformer causes the coil assembly 21 to generate a magnetic field, which cancels the magnetic field of the permanent magnet or the two cancel and weaken each other until the suction force on the movable member 20 is less than the elastic force acting on the movable member 20 after the breaking spring acts on the link assembly 3, causing the movable member 20 to disengage from the bracket 19. After that, the trigger assembly 2 cannot generate a binding force on the moving assembly.

[0051] In an alternative embodiment, the fourth abutting surface 7 rotates with the first part 12 of the third link to disengage from the second abutting surface 5.

[0052] A fourth abutting surface 7 is provided at the end of the first part 12 of the third link of the third link member. A second abutting surface 5 is provided on the hook 22 of the movable member 20 of the trigger assembly 2. The movable member 20 of the trigger assembly 2 is restricted by the second housing and slidably cooperates with the second housing, and can only move in the direction away from the bracket 19. After the third link member rotates to a certain angle, the first part 12 of the third link disengages from the hook 22 of the movable member 20. Therefore, the stroke design of the movable member 20 of the trigger assembly 2 only needs to cooperate with the stroke of the third link member before disengagement, and a smaller stroke of the movable member 20 can be designed. After disengagement, the third link member rotates relatively independently and does not drive the movable member 20 to move.

[0053] The surge protector provided by the utility model includes a lightning protection element, and the moving contact 1 in the interlocking mechanism and the lightning protection element are connected in series on the grounding loop.

[0054] The lightning protection element is located on the grounding loop. A breaking gap is also provided on the grounding loop. The moving contact 1 of the backup protection device cooperates with the breaking gap in the normal state to conduct the contacts on both sides of the breaking gap. The moving contact 1 can move under the action of the breaking spring to disengage from the contacts on both sides of the breaking gap on the grounding loop, so that the backup protection disconnector triggers a breaking operation.

[0055] It should be noted that any of the above embodiments is used to illustrate the utility model rather than to limit the utility model, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The utility model can be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In the unit claims listing several devices, several of these devices may be embodied by the same item of hardware. The use of the words first, second, previous, and next, etc. does not denote any order. These words can be interpreted as names.

[0056] The above embodiments are only suitable for illustrating the utility model rather than limiting the utility model. Those of ordinary skill in the relevant technical field can also make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, all equivalent technical solutions also belong to the scope of the utility model. The patent protection scope of the utility model shall be defined by the claims.

Claims

1. A linkage mechanism for the backup protection of a surge protector, characterized in that, It includes a moving contact (1), a triggering component (2) and a connecting rod component (3). In the first direction, the moving contact (1) has a first abutting surface (4) parallel to the first direction, the triggering component (2) has a second abutting surface (5) parallel to the first direction, and the connecting rod component (3) has a third abutting surface (6) and a fourth abutting surface (7) parallel to the first direction. The third abutting surface (6) can move along the first direction with the connecting rod component (3) to abut against the first abutting surface (4), and the fourth abutting surface (7) can move along the first direction with the connecting rod component (3) to abut against the second abutting surface (5).

2. The interlocking mechanism according to claim 1, characterized in that, The connecting rod component (3) includes a positioning component that enables the third abutting surface (6) and the fourth abutting surface (7) to be in a mating position.

3. The interlocking mechanism according to claim 2, characterized in that, The linkage mechanism further includes a first housing and a second housing. The connecting rod component (3) is connected to the first housing through a third rotating shaft, and the moving contact (1) and the triggering component (2) are connected to the second housing. The positioning component includes a first positioning member (17) and a second positioning member (18) both fixedly connected to the housing. The first positioning member (17) and the second positioning member (18) are located in a spaced structure (14) formed on the connecting rod component (3), and respectively abut against the end faces at both ends of the spaced structure (14) along the circumferential direction of the third rotating shaft. A through hole (15) is provided on the first housing, and a push rod (16) is provided on the second housing. The push rod (16) can pass through the through hole (15) to abut against the first positioning member (17) and push the first positioning member (17) to disengage from the connecting rod component (3).

4. The interlocking mechanism according to claim 3, wherein, The connecting rod component (3) includes a third connecting rod member, and the third connecting rod member is connected to the first housing through the third rotating shaft. The third connecting rod member has a first part of the third connecting rod (12) and a second part of the third connecting rod (13) circumferentially spaced along the third rotating shaft. The fourth abutting surface (7) is located on the first part of the third connecting rod (12), and the lever arm length of the first part of the third connecting rod (12) is greater than the lever arm length of the second part of the third connecting rod (13).

5. The interlocking mechanism according to claim 4, characterized in that, An interval structure (14) is formed between the first part of the third connecting rod (12) and the second part of the third connecting rod (13).

6. The interlocking mechanism according to claim 4, characterized in that, The connecting rod component (3) includes a first connecting rod member and a second connecting rod member both connected to the first housing. The first connecting rod member has a first part of the first connecting rod (10) and a second part of the first connecting rod (11) circumferentially arranged on the same side of the first rotating shaft. The lever arm length of the first part of the first connecting rod (10) is less than the lever arm length of the second part of the first connecting rod (11). The second connecting rod member has a first part of the second connecting rod (8) and a second part of the second connecting rod (9) circumferentially arranged. The first part of the first connecting rod (10) abuts against the second part of the second connecting rod (9), the first part of the second connecting rod (8) abuts against the first abutting surface (4) and rotates to disengage, and the second part of the first connecting rod (11) abuts against the second part of the third connecting rod (13).

7. The interlocking mechanism according to claim 6, characterized in that, The lever arm length of the first part (8) of the second connecting rod is less than the lever arm length of the second part (9) of the second connecting rod.

8. The interlocking mechanism according to claim 4, wherein The trigger assembly (2) includes a bracket (19) and a movable member (20). The movable member (20) is adsorbed and cooperated with the bracket (19) by the magnetic field force of a permanent magnet. A coil assembly (21) is sleeved on the bracket (19). The coil assembly (21) is electrically connected to a transformer sleeved on a grounding line. The second abutting surface (5) is provided on the movable member (20).

9. The linkage mechanism according to claim 8, wherein The fourth abutting surface (7) rotates with the first part (12) of the third connecting rod until it disengages from the second abutting surface (5).

10. A surge protector, comprising a lightning protection component, characterized in that, The moving contact (1) in the linkage mechanism according to any one of claims 1-9 and the lightning protection element are connected in series on the grounding loop.

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