Linkage mechanism and surge protector

Abstract

The invention relates to the field of surge protector equipment, in particular to a linkage mechanism and a surge protector. The linkage mechanism is used for backup protection of the surge protector and comprises a movable contact, a trigger assembly and a connecting rod assembly, in the first direction, the movable contact is provided with a first abutting face parallel to the first direction, the trigger assembly is provided with a second abutting face parallel to the first direction, and the connecting rod assembly is provided with a second abutting face 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 invention relates to the field of surge protector equipment, and in particular to a linkage mechanism and a surge protector. Background Art

[0002] In order to realize the active disconnection function of the backup protection breaker of the surge protector, the backup protection breaker of the surge protector now controls the action of the electromagnetic release through the current transformer, and the action side of the electromagnetic release cooperates with the moving contact in the interval structure arranged on the grounding circuit through the linkage mechanism. For example, the moving contact is constrained by using a hook and a slot to prevent the moving contact from moving to the contact ends of the interval structure under the action of the disconnecting spring. When the active disconnection action is triggered, the electromagnetic release drives the hook to disengage from the moving contact, so that the moving contact moves to be separated from the grounding circuit, thereby disconnecting the grounding circuit.

[0003] The problem with the above solution is that after the linkage mechanism is introduced into the existing backup protection device, the linkage mechanism includes multiple parts, which are used to realize the transmission of action between the trigger component and the moving contact, so that the smaller restraining force of the trigger component can balance the larger elastic force of the breaking spring. The introduction of the linkage mechanism increases many parts in the backup protection device of the surge protector, making the assembly complicated. Summary of the invention

[0004] On the one hand, the present invention provides a linkage mechanism that can simplify the assembly of the backup protection breaker after the linkage mechanism is introduced;

[0005] In another aspect, the present invention provides a surge protector.

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

[0007] Furthermore, the connecting rod assembly includes a positioning assembly that enables the third abutting surface and the fourth abutting surface to be in a mating position.

[0008] Furthermore, the linkage mechanism also includes a first shell and a second shell, the connecting rod assembly is connected to the first shell via a third rotating shaft, the moving contact and the trigger assembly are connected to the second shell, the positioning assembly includes a first positioning member and a second positioning member both fixed to the shells, the first positioning member and the second positioning member are located in a spacing structure opened on the connecting rod assembly, and are respectively abutted against end surfaces of both ends of the spacing structure along the circumferential direction of the third rotating shaft, a through opening is provided on the first shell, and a push rod is provided on the second shell, the push rod can pass through the through opening to abut against the first positioning member, and push the first positioning member to disengage from the connecting rod assembly.

[0009] Furthermore, the connecting rod assembly includes a third connecting rod member, which is connected to the first housing via the third rotating shaft, and the third connecting rod member has a third connecting rod first portion and a third connecting rod second portion which are circumferentially spaced apart along the third rotating shaft, the fourth abutment surface is located on the third connecting rod first portion, and the force arm length of the third connecting rod first portion is greater than the force arm length of the third connecting rod second portion.

[0010] Furthermore, the spacing structure is formed between the first portion of the third connecting rod and the second portion of the third connecting rod.

[0011] Further, the connecting rod assembly includes a first connecting rod member and a second connecting rod member both connected to the first housing, the first connecting rod member having a first connecting rod first portion and a first connecting rod second portion which are arranged along the circumference of the first rotating shaft and located on the same side of the first rotating shaft, the force arm length of the first connecting rod first portion is smaller than the force arm length of the first connecting rod second portion, the second connecting rod member having a second connecting rod first portion and a second connecting rod second portion which are arranged along the circumference of the second rotating shaft, the first connecting rod first portion abuts against the second connecting rod second portion, the second connecting rod first portion abuts against the first abutting surface and rotates to disengage, and the first connecting rod second portion abuts against the third connecting rod second portion.

[0012] Furthermore, a lever arm length of the first portion of the second connecting rod is smaller than a lever arm length of the second portion of the second connecting rod.

[0013] Furthermore, the trigger component includes a bracket part and a movable part, the movable part and the bracket part are adsorbed and matched through the magnetic field force of the permanent magnet, the bracket part is sleeved with a coil component, the coil component is electrically connected to a mutual inductor sleeved on the grounding line, and the movable part is provided with the second abutment surface.

[0014] Furthermore, the fourth abutting surface rotates along with the first portion of the third connecting rod to be disengaged from the second abutting surface.

[0015] The surge protector provided by the present invention comprises a lightning protection element, and the moving contact in any one of the above-mentioned linkage mechanisms and the lightning protection element are connected in series on a grounding circuit.

[0016] Beneficial Effects

[0017] In order to solve the problem of complex assembly after the introduction of the linkage mechanism, this solution will form a relatively independent integrated component into the connecting rod assembly that realizes the linkage between the moving contact and the trigger assembly. The connecting rod assembly cooperates with the moving contact through the third abutment surface, and cooperates with the trigger assembly through the fourth abutment surface. When cooperating, the integrated component where the connecting rod assembly is located is assembled with the moving contact and the trigger assembly along the first direction. Since the first abutment surface of the moving contact used to cooperate with the connecting rod assembly is parallel to the first direction, the second abutment surface of the trigger assembly used to cooperate with the connecting rod assembly is also parallel to the first direction, and the third abutment surface and the fourth abutment surface corresponding to the connecting rod assembly are also parallel to the first direction, the third abutment surface and the fourth abutment surface serving 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 abutment surface and the second abutment surface, thereby realizing the connection of the connecting rod assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the connecting rod assembly, the moving contact and the trigger assembly provided in the first embodiment of the present invention;

[0020] Figure 2 It is a partial structural schematic diagram of the connecting rod assembly provided in Embodiment 1 and Embodiment 2 of the present invention;

[0021] Figure 3 is a schematic diagram of the structure of the cooperation between the third connecting rod and the positioning assembly provided in the first embodiment of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the trigger component provided in Embodiment 1 and Embodiment 2 of the present invention.

[0023] Figure numbers: 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 second connecting rod; 9-second part of second connecting rod; 10-first part of first connecting rod; 11-second part of first connecting rod; 12-first part of third connecting rod; 13-second part of third connecting rod; 14-spacer structure; 15-through opening; 16-push rod; 17-first positioning member; 18-second positioning member; 19-bracket; 20-movable member; 21-coil assembly; 22-hook. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0025] Embodiment 1

[0026] like Figures 1 to 4 A linkage mechanism shown is used for backup protection of a surge protector, comprising a moving contact 1, a trigger assembly 2 and a connecting rod assembly 3. Along a 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] In order to solve the problem of coordination between the restraining force of the electromagnetic release as the trigger component 2 and the elastic force of the disconnecting spring of the moving contact 1 in the backup protection active disconnection scheme, a linkage mechanism is introduced into the existing backup protection device. The linkage mechanism includes multiple parts and is used to realize the transmission of action between the trigger component 2 and the moving contact 1, so that the smaller restraining force of the trigger component 2 can balance the larger elastic force of the disconnecting spring. The introduction of the linkage mechanism adds a lot of parts to the backup protection device of the surge protector, resulting in complicated assembly. In order to solve the problem of complicated assembly of the backup protection device after the introduction of the linkage mechanism, the present scheme forms a relatively independent integrated component with the connecting rod component 3 that realizes the linkage between the moving contact 1 and the trigger component 2. The connecting rod component 3 realizes coordination with the moving contact 1 through the third abutting surface 6 and realizes coordination with the trigger component 2 through the fourth abutting surface 7. When cooperating, the integrated component where the connecting rod component 3 is located is aligned with the moving contact 1 and the trigger component 2 along the first direction. The component 2 is assembled, since the first abutment surface 4 of the moving contact 1 used to cooperate with the connecting rod assembly 3 is parallel to the first direction, the second abutment surface 5 of the trigger component 2 used to cooperate with the connecting rod assembly 3 is also parallel to the first direction, and the third abutment surface 6 and the fourth abutment surface 7 corresponding to the connecting rod assembly 3 are also parallel to the first direction. Therefore, the third abutment surface 6 and the fourth abutment 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 abutment surface 4 and the second abutment surface 5, thereby realizing the connection of the connecting rod assembly 3.

[0028] In an optional embodiment, the connecting rod assembly 3 includes a positioning assembly that enables the third abutting surface 6 and the fourth abutting surface 7 to be in a mating position.

[0029] The function of the positioning assembly is to ensure that the connecting rod assembly 3 remains in a mating state when it is not mating with the moving contact 1 and the trigger assembly 2, so that when the connecting rod assembly 3 is embedded in the backup protection device where the moving contact 1 and the trigger assembly 2 are located along the first direction, its third abutment surface 6 and the fourth abutment surface 7 are at an angle that can abut against the first abutment surface 4 and the second abutment surface 5.

[0030] The connecting rod assembly 3 is used to realize the transmission of action between the trigger assembly 2 and the moving contact 1, and includes multiple parts. When the connecting rod assembly 3 is not coordinated with the moving contact 1 and the trigger assembly 2, the connecting rod assembly 3 is not subject to the restraining force of the trigger assembly 2 and the elastic force of the breaking spring of the moving contact 1. Therefore, the parts of the connecting rod assembly 3 are in a movable state. To facilitate the assembly of the connecting rod assembly 3, the positioning assembly cooperates with one or more parts of the connecting rod assembly 3 in the integrated component where the connecting rod assembly 3 is located to prevent its movement.

[0031] The positioning assembly can be separated from the parts of the connecting rod assembly 3 after the connecting rod assembly 3 is matched with the trigger assembly 2 and the moving contact 1.

[0032] In an optional embodiment, the linkage mechanism also includes a first shell and a second shell, the connecting rod assembly 3 is connected to the first shell through a third rotating shaft, the moving contact 1 and the trigger assembly 2 are connected to the second shell, and the positioning assembly includes a first positioning member 17 and a second positioning member 18 both of which are fixed to the shell, the first positioning member 17 and the second positioning member 18 are located in a spacing structure 14 opened on the connecting rod assembly 3, and are respectively abutted against the end surfaces of the spacing structure 14 at both ends along the circumferential direction of the third rotating shaft, a through opening 15 is provided on the first shell, and a push rod 16 is provided on the second shell, the push rod 16 can pass through the through opening 15 to abut against the first positioning member 17, and push the first positioning member 17 to disengage from the connecting rod assembly 3.

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

[0034] The positioning assembly includes a first positioning member 17 and a second positioning member 18 both of which are fixedly connected to the shell. The connecting rod assembly 3 is connected to the first shell through a third rotating shaft. A spacing structure 14 is provided on a component of the connecting rod assembly 3. The first positioning member 17 and the second positioning member 18 are fixedly connected to the first shell and are located in the spacing structure 14. They respectively abut against the end faces of the spacing structure 14 at both ends along the circumferential direction of the third rotating shaft. That is, the first positioning member 17 and the second positioning member 18 constrain the connecting rod assembly 3 along its rotation direction, so that it keeps the third abutting surface 6 and the fourth abutting surface 7 at an angle that can abut against each other.

[0035] Since the movable contact 1 moves unidirectionally, the connecting rod assembly 3 matched with the movable contact 1 also rotates unidirectionally with the movable contact 1 when there is no restraining force provided by the trigger assembly 2, and the first positioning member 17 constrains the connecting rod assembly 3 along its rotation direction.

[0036] Preferably, the first positioning member 17 is inclined relative to the first direction, and a pushing surface is provided on the side facing the through hole 15. When the first shell is matched with the second shell along the first direction, the pushing rod 16 on the second shell passes through the through hole 15 on the first shell and enters the first shell, abutting against the pushing surface of the first positioning member 17, and continues to push the pushing surface in the first direction, so that the first positioning member 17 is deformed and detached from the end face of the spacing structure 14.

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

[0038] In an optional embodiment, the connecting rod assembly 3 includes a third connecting rod member, which is connected to the first housing via a third rotating shaft, and the third connecting rod member has a third connecting rod first part 12 and a third connecting rod second part 13 which are circumferentially spaced apart along the third rotating shaft, and the fourth abutment surface 7 is located on the third connecting rod first part 12, and the lever arm length of the third connecting rod first part 12 is greater than the lever arm length of the third connecting rod second part 13.

[0039] The lever arm length refers to the length between the mating position of the third link and the third rotating shaft. The fourth abutment surface 7 is located on the first part 12 of the third link. The lever arm length of the first part 12 of the third link refers to the distance between the fourth abutment 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 13 of the third link. For the trigger assembly 2, the first part 12 of the third link and the second part 13 of the third link form a force-saving lever model. Therefore, the smaller constraint force generated by the trigger assembly 2 can balance the larger elastic force generated by the breaking spring.

[0040] In an optional embodiment, a spacing structure 14 is formed between the third connecting rod first portion 12 and the third connecting rod second portion 13 .

[0041] The second positioning member 18 abuts against the first part 12 of the third link, and the first positioning member 17 abuts against the second part 13 of the third link. The first part 12 of the third link abuts against the second abutting surface 5 of the trigger assembly 2 through the fourth abutting surface 7, and the second part 13 of the third link 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 12 of the third link, 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 13 of the third link, and finally disengages.

[0042] To ensure the breaking effect of the grounding circuit, the stroke of the moving contact 1 is relatively large so that the moving contact 1 can be completely disengaged from the contacts on both sides of the breaking gap on the grounding circuit. Correspondingly, the trigger component 2 also needs a larger stroke to cooperate with the moving contact 1. The trigger component 2 in this scheme is disengaged after the third connecting rod rotates a certain angle, and the moving contact 1 is designed as above. Therefore, the stroke design of the trigger component 2 only needs to cooperate with the stroke of the moving contact 1 before disengagement, and a smaller stroke of the trigger component 2 can be designed. After disengagement, the moving contact 1 moves relatively independently and does not drive the third connecting rod to rotate, and the trigger component 2 no longer moves accordingly.

[0043] Embodiment 2

[0044] In an optional embodiment, the connecting rod assembly 3 includes a first connecting rod member and a second connecting rod member both connected to the first housing, the first connecting rod member having a first connecting rod first portion 10 and a first connecting rod second portion 11 which are arranged along the circumference of the first rotating shaft and located on the same side of the first rotating shaft, the lever arm length of the first connecting rod first portion 10 is smaller than the lever arm length of the first connecting rod second portion 11, the second connecting rod member having a second connecting rod first portion 8 and a second connecting rod second portion 9 which are arranged along the circumference of the second rotating shaft, the first connecting rod first portion 10 abuts against the second connecting rod second portion 9, the second connecting rod first portion 8 abuts against the first abutting surface 4 and rotates to disengage, and the first connecting rod second portion 11 abuts against the third connecting rod second portion 13.

[0045] On the transmission path from the moving contact 1 to the trigger assembly 2, the connecting rod assembly 3 has a second connecting rod member, a first connecting rod member and a third connecting rod member in sequence, wherein the end of the second connecting rod first part 8 of the second connecting rod member with a shorter force arm is provided with a third abutting surface 6, which abuts against the first abutting surface 4 on the moving contact 1, the end of the second connecting rod second part 9 of the second connecting rod member with a longer force arm abuts against the end of the first connecting rod first part 10 of the first connecting rod member with a shorter force arm, the end of the first connecting rod second part 11 of the first connecting rod member with a longer force arm abuts against the third connecting rod second part 13 of the third connecting rod member, and the end of the third connecting rod first part 12 of the third connecting rod member is provided with a fourth abutting surface 7, which abuts against the second abutting surface 5 of the trigger assembly 2.

[0046] The lever arm length of the first part 8 of the second connecting rod is smaller than the lever arm length of the second part 9 of the second connecting rod. For the trigger assembly 2, the first part 8 of the second connecting rod and the second part 9 of the second connecting rod form a force-saving lever model, so that the smaller constraint force generated by the trigger assembly 2 can balance the larger elastic force generated by the breaking spring.

[0047] The first link part 10 and the first link part 11 of the first link member are located on the same side of the first rotating shaft, which means that when the first link member rotates with the movement of the moving contact 1, the first link part 10 moves, and the first link part 11 can push the parts matched with it to move in the same direction. The arm length of the first link part 10 is smaller than the arm length of the first link part 11, and the first link part 10 and the first link part 11 form a force-saving lever model, so the smaller constraint force generated by the trigger assembly 2 can balance the larger elastic force generated by the breaking spring.

[0048] In an optional embodiment, the trigger component 2 includes a bracket 19 and a movable part 20. The movable part 20 and the bracket 19 are adsorbed and matched through the magnetic field force of the permanent magnet. A coil component 21 is sleeved on the bracket 19. The coil component 21 is electrically connected to a mutual inductor sleeved on the grounding line. A second abutment surface 5 is provided on the movable part 20.

[0049] The bracket 19 is C-shaped, with an opening on one side and abutting ends on both sides of the opening. The permanent magnet magnetizes the bracket 19, and the two abutting ends adsorb the movable part 20 and abut against it under the action of the magnetic field, that is, the movable part 20 maintains a fixed relative position, and the third connecting rod member abutting against the hook 22 on the movable part 20 cannot rotate either, and then the matching first connecting rod member and the second connecting rod member cannot rotate either, thereby generating a restraining 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 transformer. The transformer is sleeved on the grounding loop. When the calibrated current flows through the grounding loop, the current generated by the transformer causes the coil assembly 21 to generate a magnetic field, which offsets the magnetic field of the permanent magnet or the two offset and weaken it to the point where its suction force on the movable part 20 is less than the elastic force acting on the movable part 20 after the breaking spring acts on the connecting rod assembly 3, so that the movable part 20 is separated from the bracket 19, and thereafter the trigger assembly 2 cannot generate a restraining force on the moving assembly.

[0051] In an optional embodiment, the fourth abutting surface 7 rotates along with the third connecting rod first portion 12 to be disengaged from the second abutting surface 5 .

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

[0053] The surge protector provided by the present invention comprises a lightning protection element, wherein a moving contact 1 in a linkage mechanism and the lightning protection element are connected in series on a grounding circuit.

[0054] The lightning protection element is located on the grounding circuit, and a disconnecting gap is also provided on the grounding circuit. The moving contact 1 of the backup protection device cooperates with the disconnecting gap under normal conditions to connect the contacts on both sides of the disconnecting gap. The moving contact 1 can move to the point where it is separated from the contacts on both sides of the disconnecting gap on the grounding circuit under the action of the disconnecting spring, so that the backup protection breaker triggers the disconnecting operation.

[0055] It should be noted that any of the above embodiments is illustrative of the present invention rather than limiting the present invention, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation to the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of multiple such elements. The present invention may be implemented by means of hardware comprising several different elements and by means of appropriately programmed computers. In a unit claim that lists several devices, several of these devices may be embodied by the same hardware item. The use of the words primary, secondary, previous, and next, etc. does not indicate any order. These words may be interpreted as names.

[0056] The above implementation modes are only suitable for illustrating the present invention, but not for limiting the present invention. Ordinary technicians in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. A linkage mechanism for backup protection of a surge protector, characterized in that: The invention comprises a movable contact (1), a trigger assembly (2) and a connecting rod assembly (3); along a first direction, the movable 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).

2. The linkage mechanism according to claim 1, characterized in that: The connecting rod assembly (3) comprises a positioning assembly which enables the third abutting surface (6) and the fourth abutting surface (7) to be in a matching position.

3. The linkage mechanism according to claim 2, characterized in that: The linkage mechanism further comprises a first shell and a second shell, the connecting rod assembly (3) is connected to the first shell via a third rotating shaft, the moving contact (1) and the trigger assembly (2) are connected to the second shell, the positioning assembly comprises a first positioning member (17) and a second positioning member (18) both of which are fixedly connected to the shell, the first positioning member (17) and the second positioning member (18) are located in a spacing structure (14) provided on the connecting rod assembly (3), and are respectively abutted against end surfaces of both ends of the spacing structure (14) along the circumferential direction of the third rotating shaft, the first shell is provided with a through opening (15), and the second shell is provided with a push rod (16), the push rod (16) can pass through the through opening (15) to abut against the first positioning member (17), and push the first positioning member (17) to separate from the connecting rod assembly (3).

4. The linkage mechanism according to claim 3, characterized in that: The connecting rod assembly (3) includes a third connecting rod member, which is connected to the first housing via the third rotating shaft. The third connecting rod member has a third connecting rod first portion (12) and a third connecting rod second portion (13) which are arranged at intervals along the circumference of the third rotating shaft. The fourth abutment surface (7) is located on the third connecting rod first portion (12), and the lever arm length of the third connecting rod first portion (12) is greater than the lever arm length of the third connecting rod second portion (13).

5. The linkage mechanism according to claim 4, characterized in that: The spacing structure (14) is formed between the first portion (12) of the third connecting rod and the second portion (13) of the third connecting rod.

6. The linkage mechanism according to claim 4, characterized in that: The connecting rod assembly (3) comprises a first connecting rod member and a second connecting rod member both connected to the first housing, the first connecting rod member comprising a first connecting rod first portion (10) and a first connecting rod second portion (11) which are arranged along the circumference of the first rotating shaft and located on the same side of the first rotating shaft, the lever arm length of the first connecting rod first portion (10) is smaller than the lever arm length of the first connecting rod second portion (11), the second connecting rod member comprising a second connecting rod first portion (8) and a second connecting rod second portion (9) which are arranged along the circumference of the second rotating shaft, the first connecting rod first portion (10) abuts against the second connecting rod second portion (9), the second connecting rod first portion (8) abuts against the first abutting surface (4) and rotates to disengage, and the first connecting rod second portion (11) abuts against the third connecting rod second portion (13).

7. The linkage mechanism according to claim 4, characterized in that: The lever arm length of the first portion (8) of the second connecting rod is smaller than the lever arm length of the second portion (9) of the second connecting rod.

8. The linkage mechanism according to claim 4, characterized in that: The trigger component (2) comprises a bracket (19) and a movable component (20); the movable component (20) and the bracket (19) are adsorbed and matched with each other through the magnetic field force of a permanent magnet; a coil component (21) is sleeved on the bracket (19); the coil component (21) is electrically connected to a mutual inductor sleeved on a grounding line; and the movable component (20) is provided with the second abutting surface (5).

9. The linkage mechanism according to claim 8, characterized in that: The fourth abutting surface (7) rotates along with the first portion (12) of the third connecting rod until it is disengaged from the second abutting surface (5).

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

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