Surge protector and assembly method therefor

Abstract

A surge protector, comprising a housing, a nonlinear element, a first wiring board, a second wiring board and a thermal disconnection assembly, wherein the nonlinear element comprises a first pin and a second pin; the surge protector further comprises the thermal disconnection assembly disposed in the housing; the thermal disconnection assembly comprises an elastic sheet and an indicator; the second pin is electrically connected to the second wiring board by means of the elastic sheet; the elastic sheet comprises a movable portion and a fixed portion electrically connected to the second wiring board; the movable portion is soldered to the second pin by means of a hot-meltable soldering portion and is fixedly stacked on the indicator in the direction of thickness of the surge protector; and the indicator is stacked on the nonlinear element in the direction of thickness of the surge protector in a spaced manner, and is movable between a first position and a second position in the direction of thickness of the surge protector. In the surge protector of the present invention, the elastic sheet integrates multiple functions. An assembly method for the surge protector is used for the assembly of the above surge protector. The assembly method of the present invention involves fewer steps and simple assembly, and totally adopts a stacked assembly.

Description

Surge protector and assembling method thereof

[0001] The present application claims priority from Chinese Patent Application No. CN202410729978.5 and filed on June 06, 2024, the whole content of the above-mentioned Chinese Patent Application is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of low-voltage electrical apparatus, in particular to a surge protector and an assembling method thereof. BACKGROUND

[0003] The surge protector is mainly applied to the power supply system, and provides safety protection for various electronic devices, instruments, communication lines, and is an electronic device connected in parallel to the electrical circuit. When a sharp peak current or voltage suddenly occurs in the electrical circuit or communication line due to external interference, the surge protector can conduct and shunt in time, so that the equipment in the circuit is not damaged by the sharp peak current or voltage.

[0004] The surge protector generally has the function of conducting and shunting the sharp peak current or voltage, and needs to have the function of thermal disconnection indication after over-limit operation, so as to facilitate the user to find the fault and replace the product in time. In order to realize these functions, a nonlinear element such as a pressure-sensitive resistor or a gas discharge tube needs to be placed inside the surge protector. The nonlinear element needs to be designed with two pins connected in parallel to the main circuit, and needs to be thermally disconnected when it is damaged after over-limit operation. However, the connection structure of the nonlinear element and the main circuit of the surge protector in the prior art is relatively complex, with many welding points, many connection points, complex manufacturing process, and high production cost. SUMMARY

[0005] The present application aims to overcome at least one defect of the prior art, and provides a surge protector and an assembling method thereof.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] The surge protector comprises a housing, a nonlinear element, a first terminal board and a second terminal board installed in the housing, the nonlinear element comprises a first pin for electrically connecting with the first terminal board and a second pin for electrically connecting with the second terminal board, the surge protector further comprises a thermal disengagement assembly installed in the housing, the thermal disengagement assembly comprises a spring and a moving indicator, the second pin is electrically connected with the second terminal board through the spring, the spring comprises a movable part and a fixed part electrically connected with the second terminal board, the movable part is welded with the second pin through a heat-fusible welding part, and the movable part is stacked on the indicator in the thickness direction of the surge protector; the indicator is stacked and spaced apart on the nonlinear element in the thickness direction of the surge protector and can move between a first position and a second position in the thickness direction of the surge protector; after the welding part is heat-fused, the movable part is disengaged from the second pin under the elastic force of the spring itself, and simultaneously drives the indicator to switch from the first position to the second position in the thickness direction of the surge protector.

[0008] Optionally, the second pin is located on the side of the indicator away from the fixed part, one end of the movable part close to the fixed part is stacked and fixed with the indicator, the other end of the movable part away from the fixed part is stacked and welded on the second pin, and the side of the movable part facing the second pin is a welding surface opposite to the second pin and welded with the second pin.

[0009] Optionally, the side of the indicator facing the movable part is provided with a limiting groove limiting and cooperating with the movable part, and the movable part is limitingly fixed in the limiting groove.

[0010] Optionally, one end of the movable part close to the fixed part has a limiting shoulder resisting outside the limiting groove.

[0011] Optionally, the limiting groove has two limiting side walls symmetrically arranged, one end of the two limiting side walls is spaced apart on the side of the indicator facing the movable part to form limiting of the movable part in the width direction of the movable part, and the other end of the two limiting side walls is bent towards each other to form limiting of the movable part in the thickness direction of the movable part between the side of the indicator facing the movable part.

[0012] Optionally, the housing is provided with a clamping groove, and one end of the second terminal board and the fixed part of the spring abut and are interference-fitted in the clamping groove.

[0013] Optionally, the fixed part of the spring is provided with a clamping opening for clamping with the second terminal board, and one end of the second terminal board is clamped into the clamping opening.

[0014] Optionally, the fixed part comprises a first clamping sheet and a second clamping sheet, one end of the second clamping sheet is connected with one end of the first clamping sheet, and the other end is bent to form the clamping opening in spaced apart relation with the first clamping sheet.

[0015] Optionally, the elastic sheet further comprises a straight middle part connected between the movable part and the fixed part.

[0016] Optionally, the housing is provided with a protruding guide column having a first guide wall, and the indicating member is provided with a guide groove matched with the guide column, the guide groove having a second guide wall slidably matched with the first guide wall, and the first guide wall is arranged to be inclined towards the fixed part of the elastic sheet and away from the movable part.

[0017] Optionally, the housing is provided with an indicating window, and the indicating member is provided with an indicating mark; when the indicating member is located at the first position, the indicating mark is misaligned with the indicating window; and when the indicating member is located at the second position, the indicating mark is opposite to the indicating window.

[0018] Optionally, the indicating member is in a U-shaped structure, the middle part of the U-shaped structure is arranged in layers and in intervals on the nonlinear element, the middle part of the U-shaped structure is provided with a limiting groove matched with the movable part on the side surface facing the movable part, and the two side walls of the U-shaped structure form two extending parts extending downward, wherein the extending part close to the indicating window is provided with an indicating mark on the side facing the indicating window.

[0019] Optionally, the second terminal block and the first terminal block are respectively located at two ends of the length direction of the surge protector, the direction from the second terminal block to the first terminal block is the length direction of the surge protector, and the length direction of the elastic sheet is arranged along the length of the surge protector; the nonlinear element is located at the middle part of the surge protector and between the second terminal block and the first terminal block, the nonlinear element, the indicating member and the elastic sheet are arranged in layers in the thickness direction of the surge protector, and the length direction of the indicating member is arranged along the height of the surge protector.

[0020] The surge protector of the present application, the elastic sheet serves as a conductive part for electrically connecting the nonlinear element and the second terminal block to realize the thermal disconnection function of the surge protector, and drives the indicating member when thermal disconnection occurs, the elastic sheet integrates multiple functions, greatly reduces the number of parts and electric connection points of the surge protector, effectively improves the reliability and production efficiency, and reduces the manufacturing cost, and the elastic sheet is arranged in layers and fixed on the indicating member to form a thermal disconnection assembly arranged in layers on the nonlinear element, the assembly is assembled in layers, the assembly difficulty is reduced, and the assembly method is simple and convenient.

[0021] In addition, the fixed part is designed to have a bending feature so that it can realize elastic clamping without welding when in contact with the second terminal block, which not only improves the reliability of conduction, but also reduces the manufacturing cost and improves the processing efficiency.

[0022] The application discloses a method for assembling a surge protector, and belongs to the technical field of surge protectors.

[0023] a. installing a nonlinear element and a first wiring board in a base;

[0024] b. laminating a movable part of a spring sheet on an indicating part to form a thermal disengagement assembly;

[0025] c. installing the thermal disengagement assembly in the base along a thickness direction, and laminating and spacing the thermal disengagement assembly on the nonlinear element, and the movable part corresponds to a second pin of the nonlinear element;

[0026] d. pressing the movable part along the thickness direction, and welding the movable part of the spring sheet in the thermal disengagement assembly and the second pin of the nonlinear element; wherein, the step a is before the step b, or the step b is before the step a.

[0027] Optionally, in the step c, a fixed part of the spring sheet in the thermal disengagement assembly is arranged in a clamping groove of the base, and the method further comprises the following step: e. clamping one end of a second wiring board between the fixed part of the spring sheet in the thermal disengagement assembly and a side wall of the clamping groove opposite to the fixed part;

[0028] f. welding the first wiring board and the first pin of the nonlinear element;

[0029] g. covering the base with an upper cover;

[0030] wherein, the second wiring board is installed in the base before the step e;

[0031] the step d is before the step e, or the step e is before the step d; the step f is before the step a, or after the step a to before the step g.

[0032] The method for assembling the surge protector has few steps, is simple to assemble, is easy to realize automation, and improves efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0033] Fig. 1 is an exploded view of the surge protector of the application;

[0034] Fig. 2 is a view of the surge protector of the application without the upper cover;

[0035] Fig. 3 is a perspective view of the surge protector of the application without the upper cover;

[0036] Fig. 4 is a perspective view of the surge protector of the application without the upper cover after thermal disengagement;

[0037] Fig. 5 is an assembly view of the spring sheet and the indicating part of the application;

[0038] Fig. 6 is a structural schematic diagram of the spring sheet of the present application;

[0039] Fig. 7 is a structural schematic diagram of the indicating member of the present application;

[0040] Fig. 8 is an assembly diagram of the upper cover and the indicating member of the present application;

[0041] Fig. 9 is a structural schematic diagram of the upper cover of the present application;

[0042] Fig. 10 is a schematic diagram of step a in the assembly process of the present application;

[0043] Fig. 11 is a schematic diagram of step d in the assembly process of the present application;

[0044] Fig. 12 is a schematic diagram of step e in the assembly process of the present application;

[0045] Fig. 13 is a schematic diagram of step g in the assembly process of the present application.

[0046] Base 1; clamping slot 10; limiting part 11; indicating window 12; nonlinear element 2; first pin 21; second pin 22; spring sheet 3; movable part 31; welding surface 311; limiting shoulder 312; straight middle part 32; fixed part 33; clamping slot 331; first clamping sheet 332; arc-shaped section 333; first inclined section 334; second inclined section 335; second clamping sheet 336; indicating member 4; limiting slot 41; limiting side wall 411; indicating mark 42; extending part 43; guide slot 44; second guide wall 441; first wiring board 5; second wiring board 6; inner connecting end 61; outer connecting end 62; upper cover 7; guide column 71; first guide wall 711; first wiring seat 8; second wiring seat 9. DETAILED DESCRIPTION

[0047] The following embodiments, given in conjunction with the accompanying drawings, further illustrate the specific implementation of the surge protector of the present application and the assembly method thereof. The surge protector of the present application and the assembly method thereof are not limited to the following embodiments.

[0048] As shown in FIG. 1-2, the surge protector of the present embodiment comprises a shell and a nonlinear element 2, a first terminal plate 5 and a second terminal plate 6 installed in the shell, the shell comprises a base 1 and an upper cover 7 which are overlapped with each other. The surge protector is connected to the main circuit in parallel through the first terminal plate 5 and the second terminal plate 6, the first terminal plate 5 and the second terminal plate 6 are installed on both sides of the shell, and the both sides of the shell are provided with terminal ports corresponding to the first terminal plate 5 and the second terminal plate 6. The first terminal plate 5 is assembled with a first terminal seat 8 and a first terminal screw to form a first terminal, and the second terminal plate 6 is assembled with a second terminal seat 9 and a second terminal screw to form a second terminal. The first terminal and the second terminal are both standard terminal structures, and other terminal structures can also be used, which are prior art and will not be described here.

[0049] As shown in FIG. 1-4, the surge protector of the present embodiment further comprises a thermal disengagement assembly installed in the shell, the thermal disengagement assembly comprises a spring sheet 3 and a movable indicating element 4, the nonlinear element 2 of the present embodiment is a pressure sensitive resistor, comprising a first pin 21 for electrically connecting with the first terminal plate 5 and a second pin 22 for electrically connecting with the second terminal plate 6, the first pin 21 is electrically connected with the first terminal plate 5 by spot welding or soldering, the second pin 22 is electrically connected with the second terminal plate 6 through the spring sheet 3, the spring sheet 3 comprises a movable part 31 and a fixed part 33 electrically connected with the second terminal plate 6, the movable part 31 is welded with the second pin 22 through a heat-fusible welding part, and the movable part 31 is laminated and fixed on the indicating element 4; the indicating element 4 is laminated and spaced on the nonlinear element 2 and can move between a first position and a second position. After the welding part is heat-fused, the movable part 31 is separated from the second pin 22 under the action of the spring force of the spring sheet 3, and simultaneously drives the indicating element 4 to switch from the first position to the second position. The surge protector of the present embodiment, the spring sheet 3 not only serves as an electrically conductive part for electrically connecting the nonlinear element 2 with the second terminal plate 6 to realize the thermal disengagement function of the surge protector, but also drives the indicating element 4 during thermal disengagement, so that the spring sheet 3 integrates multiple functions, greatly reduces the number of parts and electrically connecting points of the surge protector, effectively improves the reliability and production efficiency, and reduces the manufacturing cost. The spring sheet 3 is laminated and fixed on the indicating element 4 to form an integrated thermal disengagement assembly laminated on the nonlinear element 2, which reduces the assembly difficulty and simplifies the assembly method. Of course, the nonlinear element 2 of the present embodiment can also be a gas discharge tube and the like. It should be noted that the movable part 31 and the second pin 22 are welded by low-temperature soldering wire to form a heat-fusible welding part therebetween.

[0050] In the embodiment, the second terminal block 6 and the first terminal block 5 are respectively located at two ends of the length direction of the surge protector, the direction from the second terminal block 6 to the first terminal block 5 is the length direction of the surge protector, and the length direction of the spring sheet 3 is arranged along the length direction of the surge protector; the nonlinear element 2 is located in the middle of the surge protector and between the second terminal block 6 and the first terminal block 5; the nonlinear element 2, the indicating element 4 and the spring sheet 3 are arranged in a stack in the thickness direction of the surge protector, and the length direction of the indicating element 4 is arranged along the height direction of the surge protector. After the welding part is hot melted, the movable part 31 is separated from the second pin 22 under the action of the spring force of the spring sheet 3, and simultaneously drives the indicating element 4 to move in the thickness direction of the surge protector from the first position to the second position. The cooperation of the indicating element 4 and the spring sheet 3 in the embodiment can reduce the assembly difficulty, only need to install the nonlinear element 2 and the first terminal block 5 in the thickness direction in the shell seat 1, and then install the movable part 31 of the spring sheet 3 into the hot disengagement assembly in the thickness direction in the shell seat 1, so that the movable part 31 corresponds to the second pin 22, and after the movable part 31 is pressed in the thickness direction, the movable part 31 and the second pin 22 are welded by using low-temperature soldering wire, without the need to compress the spring or the spring sheet to control the movable part 31 to correspond to the second pin 22 in the length direction, so that the assembly efficiency is greatly improved, and the spring sheet 3 is basically a straight sheet structure, so that the structure of the spring sheet 3 is simplified.

[0051] As shown in FIG. 1-2, the cooperation structure between the movable part 31 and the indicating part 4 and the second pin 22 in the embodiment, the second pin 22 is located at the side of the indicating part 4 away from the fixed part 33, the end of the movable part 31 close to the fixed part 33 is fixed in layers with the indicating part 4, the other end of the movable part 31 away from the fixed part 33 is welded in layers on the second pin 22, and the side of the movable part 31 facing the second pin 22 is a welding surface 311 opposite to the second pin 22 and welded. As shown in FIG. 3, the welding surface 311 of the spring 3 and the second pin 22 of the nonlinear element 2 are welded through the welding part in the normal state; as shown in FIG. 4, when the nonlinear element 2 generates heat under the fault current / voltage, the welding part is hot melted, the movable part 31 of the spring 3 moves upward under the elastic force of the spring 3 to make the welding surface 311 separate from the second pin 22 of the nonlinear element 2, at the same time, since the movable part 31 of the spring 3 is fixedly connected with the indicating part 4, the movable part 31 drives the indicating part 4 to rotate to realize fault indication, the side of the indicating part 4 away from the fixed part 33 is turned upward, and the other side of the indicating part 4 close to the fixed part 33 is turned downward, that is, the movable part 31 of the spring 3 drives the indicating part 4 to rotate a certain angle in the thickness direction of the surge protector with the fixed part 33 as the rotation center. The layout is compact and reasonable, and the structure is simplified. As other embodiments, the indicating part 4 can also be arranged to move linearly in the thickness direction of the surge protector driven by the movable part 31 of the spring 3.

[0052] As shown in FIG. 7-9, the guide structure for the movement of the indicating part 4 in the embodiment, the upper cover 7 of the shell is provided with a downward protruding guide column 71, the guide column 71 has a first guide wall 711, the indicating part 4 is provided with a guide groove 44 matched with the guide column 71, the guide groove 44 has a second guide wall 441 matched with the first guide wall 711 in sliding, and the first guide wall 711 is arranged in an inclined manner towards the fixed part 33 of the spring 3 and away from the movable part 31. The first guide wall 711 and the second guide wall 441 are preferably arc-shaped side walls. The first guide wall 711 of the guide column 71 arranged in an inclined manner and the second guide wall 441 of the guide groove 44 matched in sliding play a guiding role for the movement of the indicating part 4, the indicating part 4 can stably and reliably turn and switch positions after thermal separation, and the reliability of fault indication is improved.

[0053] As shown in FIG. 4 and FIG. 5, the spring 3 of the embodiment is an integral molding structure, and further includes a straight middle part 32 connected between the movable part 31 and the fixed part 33. The spring 3 is extremely simple, and is convenient for production and manufacturing and assembly.

[0054] As shown in FIGS. 5-7, the lamination and fixing structure between the spring sheet 3 and the indicating piece 4 of the present embodiment, the indicating piece 4 is provided with a limiting groove 41 on the side facing the movable part 31, and the movable part 31 is fixedly limited in the limiting groove 41. Specifically, the limiting groove 41 has two limiting side walls 411 symmetrically arranged, one end of the two limiting side walls 411 is arranged on the side of the indicating piece 4 facing the movable part 31 to form a limit to the movable part 31 in the width direction of the movable part 31, and the other end of the two limiting side walls 411 is bent towards each other to form a limit to the movable part 31 in the thickness direction of the movable part 31 between the side facing the movable part 31. The limiting side wall 411 is preferably a reverse L-shaped structure. Further, one end of the movable part 31 close to the fixed part 33 has a limiting protrusion 312 outside the limiting groove 41. The movable part 31 has two limiting protrusions 312 on the two side edges, which resist and cooperate with one end of the two limiting side walls 411 in the length direction of the movable part 31, preventing the movable part 31 from coming out of the limiting groove 41 when the spring sheet 3 and the indicating piece 4 move after thermal separation, improving the reliability of the action, and also playing a stop positioning role when the movable part 31 is inserted into the limiting groove 41. As other embodiments, the indicating piece 4 can also be provided with a corresponding limiting hole, and the movable part 31 of the spring sheet 3 passes through the limiting hole to form a fixed connection structure.

[0055] The connection structure between the spring sheet 3 and the second wiring board 6 of the present embodiment is shown in FIG. 1, one end of the second wiring board 6 is an inner connecting end 61 for electrically connecting with the fixed part 33 of the spring sheet 3, the other end of the second wiring board 6 is an outer connecting end 62 for external wiring, and the inner connecting end 61 and the outer connecting end 62 are connected in an L shape.

[0056] As shown in FIGS. 1 and 6, the fixed part 33 of the spring sheet 3 includes a first clamping sheet 332 and a second clamping sheet 336, one end of the second clamping sheet 336 is integrally connected with one end of the first clamping sheet 332, and the other end is bent to form a bayonet 331 with the first clamping sheet 332. The fixed part 33 is designed to have a bending feature so that it can realize flexible clamping without welding when it contacts the second wiring board 6, which not only improves the reliability of conduction, but also reduces the manufacturing cost and improves the processing efficiency. Specifically, the first clamping sheet 332 is perpendicular to the length direction of the spring sheet 3; the second clamping sheet 336 is a bent structure, including an arc segment 333, a first inclined segment 334 and a second inclined segment 335 connected in sequence, wherein the arc segment 333 is connected with the first clamping sheet 332, the first inclined segment 334 is arranged inclinedly away from the first clamping sheet 332, and the second inclined segment 335 is arranged inclinedly towards the first clamping sheet 332, thereby forming a narrow entrance and a wide bottom of the bayonet 331, facilitating flexible clamping between the second wiring board 6 and the fixed part 33, and the connection is firm and not easy to come out.

[0057] As shown in FIG. 1 and FIG. 6, the base 1 of the shell is provided with a clamping groove 10 having two opposite side walls, which are a pressing part and a limiting part 11. The fixed part 33 of the elastic sheet 3 is arranged in the clamping groove 10, and the outer side of the first clamping sheet 332 of the fixed part 33 abuts against the limiting part 11. In the embodiment, the elastic sheet 3 and the second wiring board 6 are connected in two ways. In the first connection mode, the inner connecting end 61 of the second wiring board 6 and the fixed part 33 are fixed in the clamping groove 10 in interference, so that the inner connecting end 61 abuts against the outer side of the second clamping sheet 336 of the fixed part 33 to realize electrical connection, that is, the inner connecting end 61 of the second wiring board 6 is clamped between the second clamping sheet 336 of the fixed part 33 and the pressing part of the clamping groove 10. In the second connection mode, the inner connecting end 61 of the second wiring board 6 is clamped in the clamping hole 331, that is, the inner connecting end 61 of the second wiring board 6 is clamped between the first clamping sheet 332 and the second clamping sheet 336 of the fixed part 33. Of course, the elastic sheet 3 and the second wiring board 6 can also be a bent flat plate structure connected by welding, riveting or the like.

[0058] As shown in FIG. 1 and FIG. 7, the indication structure of the indicating member 4 in the embodiment, the base 1 of the shell is provided with an indication window 12, and the indicating member 4 is provided with an indication mark 42 having a color different from that of the indicating member 4. As shown in FIG. 3, when the indicating member 4 is located at the first position, the indication mark 42 is misaligned with the indication window 12, that is, the color of the indication mark 42 cannot be seen, and at this time the color of the indicating member 4 can be seen from the indication window 12. As shown in FIG. 4, when the indicating member 4 is located at the second position, the indication mark 42 is opposite to the indication window 12, that is, the color of the indication mark 42 can be seen from the indication window 12. The position change of the indicating member 4 is displayed by different colors to realize the fault indication function, which is simple and intuitive. Preferably, the color of the indicating member 4 is green, and the color of the indication mark 42 is red. Of course, the indication mark 42 can also be other colors, words, symbols, patterns or a combination of colors, words, symbols and patterns.

[0059] Specifically, the indicating member 4 is a U-shaped structure, the middle part of the U-shaped structure is arranged on the nonlinear element 2 in a layered and spaced manner, the middle part of the U-shaped structure is provided with a limiting groove 41 on the side surface facing the movable part 31, the limiting groove 41 is limited and matched with the movable part 31, and the two side walls of the U-shaped structure form two downwardly extending extension parts 43, wherein the extension part 43 close to the indication window 12 is provided with the indication mark 42 on the side facing the indication window 12.

[0060] As shown in FIG. 10-FIG. 13, the assembling method of the surge protector of the embodiment, the surge protector used in the utility model, the shell of the surge protector includes the base 1 and the upper cover 7 which are covered with each other along the thickness direction, and the method includes the following steps:

[0061] a. installing the second wiring board 6, the nonlinear element 2 and the first wiring board 5 in the base 1;

[0062] b. Laminating the movable part 31 of the spring 3 on the indicating part 4 to form a thermal disengagement assembly;

[0063] c. Installing the thermal disengagement assembly in the base 1 along the thickness direction and laminating and spacing it on the nonlinear element 2, with the movable part 31 corresponding to the second pin 22 of the nonlinear element 2, and the fixed part 33 being placed in the clamping groove 10 of the base 1 and abutting against the limiting part 11;

[0064] d. Using low-temperature soldering to solder the movable part 31 of the spring 3 in the thermal disengagement assembly to the second pin 22 of the nonlinear element 2;

[0065] e. Pressing the movable part 31 along the thickness direction, and clamping the inner connecting end 61 of the second connecting plate 6 between the fixed part 33 of the spring 3 in the thermal disengagement assembly and the side wall (extrusion part) opposite to the fixed part 33 of the clamping groove 10;

[0066] f. Using soldering to solder the first connecting plate 5 to the first pin 21 of the nonlinear element 2;

[0067] g. Covering the upper cover 7 on the base 1.

[0068] Some of the above steps can be changed in sequence, for example, the second connecting plate 6 can also not be placed in the base 1 in step a, but can be placed in the base 1 in a separate process in step e. Step a can be before step b or step b can be before step a. Step d can be before step e or step e can be before step d. Step f can be before step a or after step a to before step g, that is, the nonlinear element 2 and the first connecting plate 5 are installed in the base 1 respectively, and then the first connecting plate 5 is soldered to the first pin 21; or, the first connecting plate 5 is soldered to the first pin 21 of the nonlinear element 2 first, and then the first connecting plate 5 and the nonlinear element 2 soldered together are installed in the base 1, which are all possible.

[0069] Before the assembly of the surge protector starts, there is also an assembly preparation work, which is to disassemble the base 1 and the upper cover 7 that cover each other, and place the base 1 on the assembly station.

[0070] The assembly method of the surge protector of the present application has fewer steps and is simple to assemble, all of which are laminated assembly, easy to realize automation and improve efficiency.

[0071] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when in use, and are only for the convenience of description, and do not indicate that the device or element referred to must have a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating relative importance.

[0072] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be considered as limiting the specific implementation of the present application to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, a number of simple deductions or substitutions can be made without departing from the concept of the present application, and all should be considered as falling within the protection scope of the present application.

Claims

1. Surge protector comprising a housing and mounted in the housing a non-linear element (2), a first terminal plate (5), a second terminal plate (6), said non-linear element (2) comprising a first pin (21) for electrical connection with the first terminal plate (5) and a second pin (22) for electrical connection with the second terminal plate (6), characterized in that: The surge protector further comprises a thermal disengaging assembly installed in the housing, the thermal disengaging assembly comprising a spring sheet (3) and a moving indicating piece (4), the second pin (22) being electrically connected with the second terminal plate (6) through the spring sheet (3), the spring sheet (3) comprising a movable part (31) and a fixed part (33) electrically connected with the second terminal plate (6), the movable part (31) being welded with the second pin (22) through a heat-fusible welding part, and the movable part (31) being stacked and fixed on the indicating piece (4) in the thickness direction of the surge protector; the indicating piece (4) being stacked and spaced apart on the nonlinear element (2) in the thickness direction of the surge protector and being movable between a first position and a second position in the thickness direction of the surge protector; after the welding part is heat-fused, the movable part (31) is disengaged from the second pin (22) under the action of the elasticity of the spring sheet (3) itself, and simultaneously drives the indicating piece (4) to switch from the first position to the second position in the thickness direction of the surge protector.

2. The surge protector of claim 1, wherein: The second pin (22) is located on the side of the indicating piece (4) away from the fixed part (33), one end of the movable part (31) close to the fixed part (33) is stacked and fixed on the indicating piece (4), and the other end of the movable part (31) away from the fixed part (33) is stacked and welded on the second pin (22), and the side of the movable part (31) facing the second pin (22) is a welding surface (311) opposite to the second pin (22) and welded with the second pin (22).

3. The surge protector of claim 1 or 2, wherein: The side of the indicating piece (4) facing the movable part (31) is provided with a limiting groove (41) limiting cooperation with the movable part (31), and the movable part (31) is limitingly fixed in the limiting groove (41).

4. The surge protector of claim 3, wherein: One end of the movable part (31) close to the fixed part (33) has a limiting shoulder (312) resisting outside the limiting groove (41).

5. The surge protector of claim 3, wherein: The limiting groove (41) has two limiting side walls (411) symmetrically arranged, one end of the two limiting side walls (411) is spaced apart on the side of the indicating piece (4) facing the movable part (31) to form limiting of the movable part (31) in the width direction of the movable part (31), and the other end of the two limiting side walls (411) is bent towards each other to form limiting of the movable part (31) in the thickness direction of the movable part (31) between the side of the indicating piece (4) facing the movable part (31).

6. The surge protector of claim 1, wherein: The housing is provided with a clamping groove (10), one end of the second terminal plate (6) and the fixed part (33) of the spring sheet (3) abut and are interference-fitted in the clamping groove (10).

7. The surge protector of claim 1, wherein: The fixed part (33) of the spring sheet (3) is provided with a clamping opening (331) for clamping with the second terminal plate (6), and one end of the second terminal plate (6) is clamped into the clamping opening (331).

8. The surge protector of claim 7, wherein: The fixed part (33) comprises a first clamping sheet (332) and a second clamping sheet (336), one end of the second clamping sheet (336) is connected with one end of the first clamping sheet (332), and the other end is bent to form the clamping opening (331) with the first clamping sheet (332) in a spaced manner.

9. The surge protector of claim 1, wherein: The elastic sheet (3) further comprises a straight middle part (32) connected between the movable part (31) and the fixed part (33).

10. The surge protector of claim 1, wherein: The housing is provided with a protruding guide column (71) having a first guide wall (711), and the indicating member (4) is provided with a guide groove (44) matched with the guide column (71), the guide groove (44) having a second guide wall (441) slidably matched with the first guide wall (711), and the first guide wall (711) is obliquely arranged towards the fixed part (33) of the elastic sheet (3) and away from the movable part (31).

11. The surge protector of claim 1, wherein: The housing is provided with an indicating window (12), and the indicating member (4) is provided with an indicating mark (42); when the indicating member (4) is located at the first position, the indicating mark (42) is misaligned with the indicating window (12); and when the indicating member (4) is located at the second position, the indicating mark (42) is opposite to the indicating window (12).

12. The surge protector of claim 11, wherein: The indicating member (4) is in a U-shaped structure, the middle part of the U-shaped structure is arranged in a layered and spaced manner on the nonlinear element (2), the side of the middle part of the U-shaped structure facing the movable part (31) is provided with a limiting groove (41) matched with the movable part (31) for limiting, and the two side walls of the U-shaped structure form two downwardly extending extension parts (43), wherein the extension part (43) close to the indicating window (12) is provided with an indicating mark (42) on the side facing the indicating window (12).

13. The surge protector of claim 1, wherein: The second terminal block (6) and the first terminal block (5) are respectively located at two ends of the length direction of the surge protector, the direction from the second terminal block (6) to the first terminal block (5) is the length direction of the surge protector, and the length direction of the elastic sheet (3) is arranged along the length direction of the surge protector; the nonlinear element (2) is located at the middle part of the surge protector and between the second terminal block (6) and the first terminal block (5), the nonlinear element (2), the indicating member (4) and the elastic sheet (3) are arranged in a layered manner in the thickness direction of the surge protector, and the length direction of the indicating member (4) is arranged along the height direction of the surge protector.

14. A method of assembling a surge protector, characterized by: An assembly for the surge protector of any one of claims 1-13, the housing of the surge protector comprising a base (1) and an upper cover (7) which are overlapped with each other in the thickness direction, the assembly method of the surge protector comprising the following steps: a. installing the nonlinear element (2) and the first terminal block (5) in the base (1); b. laminating and fixing the movable part (31) of the elastic sheet (3) on the indicating member (4) to form a thermal disengagement assembly; c. installing the thermal disengagement assembly in the base (1) in the thickness direction and arranging the thermal disengagement assembly in a layered and spaced manner on the nonlinear element (2), and the movable part (31) corresponds to the second pin (22) of the nonlinear element (2); d. pressing the movable part (31) in the thickness direction to weld the movable part (31) of the elastic sheet (3) in the thermal disengagement assembly and the second pin (22) of the nonlinear element (2); wherein, step a is before step b or step b is before step a.

15. The method of assembling a surge protector of claim 14, wherein: In step c, the fixed part (33) of the spring (3) in the thermal disengagement assembly is placed in the clamping groove (10) of the base (1), and the assembly method further comprises the following steps: e. one end of the second terminal plate (6) is clamped into the fixed part (33) of the spring (3) in the thermal disengagement assembly and the side wall opposite to the fixed part (33) of the clamping groove (10); f. the first terminal plate (5) is welded with the first pin (21) of the nonlinear element (2); g. the upper cover (7) is covered on the base (1); Wherein, the second terminal plate (6) is installed in the base (1) before step e; Step d is before step e or step e is before step d; step f is before step a or after step a to before step g.

Images