Surge protection device

Abstract

The surge protection device comprises a shell, a nonlinear element, an elastic piece, an indicating piece, a first wiring board and a second wiring board, the nonlinear element comprises a first pin and a second pin which are used for being electrically connected with the first wiring board, the elastic piece comprises a movable part and a fixed part which is electrically connected with the second wiring board, and the movable part is welded to the second pin through a hot-melting welding part; the indicating piece can move between a first position and a second position; and after the welding part is thermally melted, the movable part is separated from the second pin under the action of the elastic force of the elastic piece, and the indicating piece is synchronously driven to be switched from the first position to the second position. According to the surge protection device of the utility model, the elastic member not only serves as a conductive member for electrically connecting the nonlinear element and the second wiring board to realize a thermal separation function of the surge protection device, but also drives the indicating member during thermal separation, and the elastic member integrates multiple functions, thereby reducing the number of parts and electric connection points of the surge protection device, and improving the reliability of the surge protection device. The reliability and the production efficiency are effectively improved, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a surge protector. Background Art

[0002] Surge protectors are mainly used in power supply systems to provide safety protection for various electronic equipment, instruments and meters, and communication lines. They are electronic devices connected in parallel to electrical circuits. When a spike current or voltage suddenly occurs in an electrical circuit or communication line due to external interference, the surge protector can conduct and shunt the current in time to protect the equipment in the circuit from being damaged by the spike current or voltage.

[0003] Surge protectors generally have the function of conducting and shunting peak current or voltage, and need to have a thermal detachment indication function after exceeding the limit operation, so that users can find faults in time and replace products. In order to achieve these functions, nonlinear elements such as varistors or gas discharge tubes need to be placed inside the surge protector. The nonlinear element needs to be designed with two pins connected in parallel to the main circuit. When the nonlinear element is damaged by exceeding the limit operation, a thermal detachment indication is required. However, the connection structure between the nonlinear element and the main circuit of the surge protector in the prior art is relatively complex, with many solder joints and connection points, and the manufacturing process is complex and the production cost is high. Summary of the invention

[0004] The utility model aims to overcome at least one defect of the prior art and provide a surge protector.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A surge protector comprises a housing, and a nonlinear element, an elastic member, an indicator, a first wiring board, and a second wiring board installed in the housing. The nonlinear element comprises a first pin for electrically connecting to the first wiring board and a second pin for electrically connecting to the second wiring board. The second pin is electrically connected to the second wiring board through the elastic member. The elastic member comprises a movable portion and a fixed portion electrically connected to the second wiring board. The movable portion is welded to the second pin through a heat-meltable welding portion. The indicator can move between a first position and a second position. After the welding portion is heat-melted, the movable portion is separated from the second pin under the action of the elastic force of the elastic member itself, and the indicator is synchronously driven to switch from the first position to the second position.

[0007] Optionally, the movable part has a welding surface welded to the second pin and an action surface mating with the mating surface of the indicator, and in the moving direction of the indicator from the first position to the second position, the welding surface, the action surface and the mating surface are arranged in sequence.

[0008] Optionally, the elastic force direction of the elastic member is the same as the moving direction of the indicating member, and the movable part of the elastic member is an L-shaped structure with an opening facing away from the fixed part, the inner side of one end is a welding surface parallel to the elastic force direction of the elastic member, and the outer side of the other end is an action surface perpendicular to the elastic force direction of the elastic member.

[0009] Optionally, the elastic member is a spring sheet structure and further includes a bent middle portion connected between the movable portion and the fixed portion.

[0010] Optionally, the fixing portion of the elastic member is provided with a snap-in socket for snapping with the second wiring board, and one end of the second wiring board is snapped into the snap-in socket.

[0011] Optionally, the fixing portion includes a first clamping piece and a second clamping piece, one end of the second clamping piece is connected to one end of the first clamping piece, and the other end is bent and spaced apart from the first clamping piece to form the bayonet.

[0012] Optionally, the middle portion of the bend is a wavy bend structure.

[0013] Optionally, an indication window is provided on the shell, and an indication mark is provided on the indication member; when the indication member is located at a first position, the indication mark is misaligned with the indication window; when the indication member is located at a second position, the indication mark is opposite to the indication window.

[0014] Optionally, the indicator is provided with at least one guide portion, a guide groove corresponding to the guide portion is provided in the shell, and the guide portion is slidably inserted in the guide groove.

[0015] Optionally, a spring is provided between the indicator and the housing, and the elastic force direction of the spring is the same as the moving direction of the indicator.

[0016] Optionally, the nonlinear element is located between the first wiring board and the second wiring board, the elastic member is arranged on the nonlinear element, the indicator member is arranged on the nonlinear element and overlaps with the elastic member, and the elastic member and the indicator member are arranged at an angle.

[0017] Optionally, the nonlinear element is a varistor.

[0018] Optionally, the indicator is a U-shaped structure, and the side walls of the U-shaped structure form two guide parts, wherein the guide part close to the indicator window is provided with an indication mark on the side facing the indicator window, and a matching surface is provided on the inner side of the middle part of the indicator.

[0019] Optionally, the indicator is arranged to move in a straight line.

[0020] In the surge protector of the utility model, the elastic member serves as a conductive member electrically connected to the second wiring board as a nonlinear element to realize the thermal separation function of the surge protector, and drives the indicating member during the thermal separation. The elastic member integrates multiple functions in one, greatly reducing the number of parts and electrical connection points of the surge protector, effectively improving reliability and production efficiency, and reducing manufacturing costs.

[0021] In addition, the fixing portion is designed to have a bending feature so that it can achieve a solder-free elastic snap connection when in contact with the second wiring board, which not only improves the reliability of electrical conduction, but also reduces manufacturing costs and improves processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a view of the utility model surge protector;

[0023] Figure 2 This is a view of the surge protector of the utility model after thermal separation;

[0024] Figure 3 It is a three-dimensional diagram of the surge protector of the utility model;

[0025] Figure 4 It is a three-dimensional diagram of the elastic member of the utility model;

[0026] Figure 5 It is a view of the elastic member of the utility model;

[0027] Figure 6 This is a structural schematic diagram of the indicator of the utility model from one perspective;

[0028] Figure 7 This is a schematic structural diagram of another viewing angle of the indicator of the utility model;

[0029] Figure 8 It is a structural schematic diagram of the second wiring board of the utility model;

[0030] Fig. 9 It is a structural schematic diagram of the base portion of the housing of the utility model;

[0031] Fig.10 It is a structural schematic diagram of the housing of the utility model;

[0032] Shell 1; limit portion 11; indication window 12; guide groove 13; first mounting column 14; nonlinear element 2; first pin 21; second pin 22; elastic member 3; movable portion 31; welding surface 311; action surface 312; bent middle portion 32; fixing portion 33; bayonet 331; first clamping piece 332; arc segment 333; first inclined segment 334; second inclined segment 335; indicator 4; mating surface 41; indication mark 42; guide portion 43; second mounting column 44; first terminal block 5; second terminal block 6; internal connection end 61; external connection end 62; spring 7. DETAILED DESCRIPTION

[0033] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the surge protector of the utility model. The surge protector of the utility model is not limited to the description of the following embodiments.

[0034] like Figure 1-Figure 3 As shown, the surge protector of this embodiment includes a housing 1 and a nonlinear element 2, an elastic member 3, an indicator 4, a first wiring board 5, and a second wiring board 6 installed in the housing 1. The housing 1 includes a coverable base and an upper cover. The surge protector is connected in parallel to the main circuit through the first wiring board 5 and the second wiring board 6. The first wiring board 5 and the second wiring board 6 are installed on both sides of the housing 1. Both sides of the housing 1 are provided with wiring ports corresponding to the first wiring board 5 and the second wiring board 6.

[0035] like Figure 1-Figure 5As shown, the nonlinear element 2 of this embodiment is a varistor, including a first pin 21 for electrically connecting to the first wiring board 5 and a second pin 22 for electrically connecting to the second wiring board 6. The first pin 21 is electrically connected to the first wiring board 5 by spot welding or soldering, and the second pin 22 is electrically connected to the second wiring board 6 by an elastic member 3. The elastic member 3 includes a movable portion 31 and a fixed portion 33 electrically connected to the second wiring board 6. The movable portion 31 is welded to the second pin 22 by a heat-meltable welding portion; the indicator 4 can move between the first position and the second position. After the welding portion is thermally melted, the movable portion 31 is separated from the second pin 22 under the action of the elastic force of the elastic member 3 itself, and the indicator 4 is synchronously driven to switch from the first position to the second position. In the surge protector of this embodiment, the elastic member 3 is not only a conductive member electrically connecting the nonlinear element 2 to the second wiring board 6, realizing the thermal separation function of the surge protector, but also drives the indicator 4 during thermal separation. The elastic member 3 integrates multiple functions in one, greatly reducing the number of parts and electrical connection points of the surge protector, effectively improving reliability and production efficiency, and reducing manufacturing costs. In this embodiment, the indicator 4 is preferably arranged to move linearly, but can also be arranged to rotate. Of course, the nonlinear element 2 of this embodiment can also be a gas discharge tube, etc. It should be noted that the movable portion 31 and the second pin 22 are welded by low-temperature solder wire to form a heat-meltable welding portion between the movable portion 31 and the second pin 22.

[0036] like Figure 3-Figure 7 As shown in the figure, the matching structure between the elastic member 3, the nonlinear element 2 and the indicator 4 of this embodiment, the movable portion 31 has a welding surface 311 welded to the second pin 22 and an action surface 312 matched with the matching surface 41 of the indicator 4, and in the moving direction of the indicator 4 from the first position to the second position, the welding surface 311, the action surface 312 and the matching surface 41 are arranged in sequence. Figure 1 In the surge protector in the normal state shown in FIG. 1 , the welding surface 311 of the elastic member 3 is welded to the second pin 22 of the nonlinear element 2 through the welding portion, and the action surface 312 of the elastic member 3 is in contact with the matching surface 41 of the indicator 4; Figure 2 As shown, when the nonlinear element 2 is heated by the fault current / voltage, the welding part is melted by heat, so that the welding surface 311 of the elastic member 3 moves to the left and is separated from the second pin 22 of the nonlinear element 2. At the same time, the elastic member 3 acts on the matching surface 41 through the action surface 312 to drive the indicator 4 to move to the left to indicate the fault. The action surface 312 of the elastic member 3 is located between the welding surface 311 and the matching surface 41 of the indicator 4, and the layout is compact and reasonable, without mutual interference, and the structure is simplified.

[0037] Furthermore, the elastic force direction of the elastic member 3 is the same as the moving direction of the indicator member 4, that is, Figure 1The movable part 31 of the elastic member 3 is an L-shaped structure with an opening facing away from the fixed part 33, and the inner side of one end of the movable part 31 is a welding surface 311 parallel to the elastic force direction of the elastic member 3, and one end of the movable part 31 is provided with a notch in the middle, and the outer side of the other end of the movable part 31 is an action surface 312 perpendicular to the elastic force direction of the elastic member 3. The movable part 31 of the elastic member 3 has a simple structure and is easy to manufacture. Of course, the elastic member 3 can also be arranged to be inclined relative to the moving direction of the indicator 4.

[0038] like Figure 4 and Figure 5 As shown, the elastic member 3 of this embodiment is an integrally formed spring sheet structure, and also includes a bent middle portion 32 connected between the movable portion 31 and the fixed portion 33. The bent middle portion 32 is preferably a wave-shaped bent structure. Of course, the elastic member 3 can also be a spring structure or other elastic structure made of metal. The bent middle portion 32 can also be in a spiral shape.

[0039] like Figure 4 and Figure 5 As shown, the connection structure between the elastic member 3 and the second terminal block 6 of this embodiment, the fixing portion 33 of the elastic member 3 is provided with a bayonet 331 for clamping with the second terminal block 6, and one end of the second terminal block 6 is clamped into the bayonet 331. Further, the fixing portion 33 includes a first clamping piece 332 and a second clamping piece, one end of the second clamping piece is integrally connected with one end of the first clamping piece 332, and the other end is bent and spaced from the first clamping piece 332 to form the bayonet 331. The fixing portion 33 is designed to have a bending feature so that it can achieve a solder-free elastic clamping when in contact with the second terminal block 6, which not only improves the reliability of electrical conduction, but also reduces manufacturing costs and improves processing efficiency.

[0040] Specifically, Figure 8 As shown, the second wiring board 6 includes an inner connection end 61 and an outer connection end 62 connected in an L shape, wherein the outer connection end 62 is used for external wiring, and the inner connection end 61 of the second wiring board 6 is inserted into the bayonet 331. Figure 4 and Figure 5 As shown, the first clamping piece 332 is perpendicular to the elastic force direction of the elastic member 3, and the outer side of the first clamping piece 332 is fixed against the limiting portion 11 of the shell 1; the second clamping piece is a bending 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 to the first clamping piece 332, the first inclined segment 334 is inclined in the direction away from the first clamping piece 332, and the second inclined segment 335 is inclined in the direction close to the first clamping piece 332, thereby forming a narrow entrance and a wide bottom of the bayonet 331, which is convenient for the clamping of the second wiring board 6, and the connection is firm and not easy to fall out.

[0041] like Figure 1-Figure 3 As shown, the layout structure of the various parts of the surge protector of this embodiment, the nonlinear element 2 is located between the first wiring board 5 and the second wiring board 6, the elastic member 3 is stacked on the nonlinear element 2, the indicator 4 is stacked on the nonlinear element 2 and overlaps with the elastic member 3, and the elastic member 3 and the indicator 4 are arranged at an angle, and the angle is preferably 90°. The movable part 31 of the elastic member 3 has an action surface 312 extending upward to one side of the indicator 4. The overlap of the indicator 4 and the elastic member 3 means that a part of the indicator 4 is stacked on the elastic member 3, and the overlapping parts of the indicator 4 and the elastic member 3 do not interfere with the movement of the two. The layout is compact and reasonable, and there is no interference, which is conducive to the miniaturization design of the surge protector.

[0042] The matching structure between the indicator 4 and the housing 1 of this embodiment is as follows: Figure 3 , Figure 6 , Figure 7 and Fig. 9 As shown, a spring 7 is provided between the indicator 4 and the housing 1, and the elastic force direction of the spring 7 is the same as the moving direction of the indicator 4. When the indicator 4 is in the first position, the spring 7 is in an energy storage state; when the movable portion 31 of the elastic member 3 is thermally separated from the second pin 22, the spring 7 releases energy and drives the indicator 4 to the second position together with the elastic member 3. The provision of the spring 7 increases the driving force on the indicator 4, and the fault indication is faster and more reliable. Of course, as other embodiments, the spring 7 may not be provided, and when the movable portion 31 of the elastic member 3 is thermally separated from the second pin 22, the indicator 4 is driven to the second position only by the elastic force of the elastic member 3. The housing 1 is provided with a first mounting post 14 for connecting the spring 7, and the indicator 4 is provided with a second mounting post 44 for connecting the spring 7; one end of the spring 7 is hung on the first mounting post 14, and the other end of the spring 7 is hung on the second mounting post 44. In this embodiment, the spring 7 is a tension spring, and the spring 7 is arranged parallel to the elastic member 3, and the forces acting on the indicator 4 are parallel.

[0043] like Fig.10 As shown, the housing 1 is provided with an indication window 12, and the indicator member 4 is provided with an indication mark 42 having a different color from the indicator member 4; Figure 1 As shown, when the indicator 4 is in the first position, the indicator mark 42 is misaligned with the indicator window 12, that is, the color of the indicator mark 42 cannot be seen, and the color of the indicator 4 can be seen from the indicator window 12; Figure 2As shown, when the indicator 4 is in the second position, the indicator mark 42 is opposite to the indicator window 12, that is, the color of the indicator mark 42 can be seen from the indicator window 12. The position change of the indicator 4 is displayed by different colors to realize the fault indication function, which is simple and intuitive. Preferably, the color of the indicator 4 is green and the indicator mark 42 is red. Of course, the indicator mark 42 can also be other colors, words, symbols, patterns, etc., or a combination of colors, words, symbols, patterns, etc.

[0044] like Figure 3 , Figure 6 , Figure 7 and Fig. 9 As shown, the indicator 4 is provided with at least one guide portion 43, and the housing 1 is provided with a guide groove 13 corresponding to the guide portion 43, and the guide portion 43 is slidably inserted in the guide groove 13. The guide portion 43 and the guide groove 13 are slidably matched to guide the movement of the indicator 4, so that the indicator 4 moves stably and reliably. Specifically, as Figure 6 and Figure 7 As shown, the indicator 4 is a U-shaped structure, provided with two guide portions 43 at both ends and a first mounting column 14 at the middle, and the two side walls of the U-shaped structure form two guide portions 43, wherein the guide portion 43 close to the indicator window 12 is provided with an indication mark 42 on the side facing the indicator window 12, and a matching surface 41 located between the other guide portion 43 and the first mounting column 14 is provided on the inner side of the middle portion of the indicator 4. By providing the two guide portions 43 at the upper and lower sides, the movement of the indicator 4 is made more accurate and reliable, and the matching surface 41 of the indicator 4 is convenient for plugging and matching with the elastic member 3 of the spring structure, and is plugged into a position corresponding to the welding surface 311 of the elastic member 3.

[0045] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0046] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A surge protector, comprising a housing (1) and a nonlinear element (2), an elastic element (3), an indicator (4), a first wiring board (5), and a second wiring board (6) installed in the housing (1), wherein the nonlinear element (2) comprises a first pin (21) for electrically connecting to the first wiring board (5) and a second pin (22) for electrically connecting to the second wiring board (6), characterized in that: The second pin (22) is electrically connected to the second wiring board (6) via an elastic member (3); the elastic member (3) comprises a movable portion (31) and a fixed portion (33) electrically connected to the second wiring board (6); the movable portion (31) is welded to the second pin (22) via a heat-meltable welding portion; the indicator (4) is movable between a first position and a second position; after the welding portion is heat-melted, the movable portion (31) is separated from the second pin (22) under the action of the elastic force of the elastic member (3) itself, and the indicator (4) is simultaneously driven to switch from the first position to the second position.

2. The surge protector according to claim 1, characterized in that: The movable portion (31) comprises a welding surface (311) welded to the second pin (22) and an action surface (312) matched with the matching surface (41) of the indicator (4); in the moving direction of the indicator (4) from the first position to the second position, the welding surface (311), the action surface (312) and the matching surface (41) are arranged in sequence.

3. The surge protector according to claim 2, characterized in that: The elastic force direction of the elastic member (3) is the same as the moving direction of the indicating member (4); the movable portion (31) of the elastic member (3) is an L-shaped structure with an opening facing away from the fixed portion (33); the inner side of one end is a welding surface (311) parallel to the elastic force direction of the elastic member (3); and the outer side of the other end is an action surface (312) perpendicular to the elastic force direction of the elastic member (3).

4. The surge protector according to any one of claims 1 to 3, characterized in that: The elastic member (3) is a spring sheet structure and further comprises a bent middle portion (32) connected between the movable portion (31) and the fixed portion (33).

5. The surge protector according to claim 4, characterized in that: The fixing portion (33) of the elastic member (3) is provided with a snap-in opening (331) for snapping with the second wiring board (6), and one end of the second wiring board (6) is snapped into the snap-in opening (331).

6. The surge protector according to claim 5, characterized in that: The fixing portion (33) comprises a first clamping piece (332) and a second clamping piece, one end of the second clamping piece is connected to one end of the first clamping piece (332), and the other end is bent and spaced apart from the first clamping piece (332) to form the bayonet (331).

7. The surge protector according to claim 4, characterized in that: The bent middle portion (32) is a wave-shaped bent structure.

8. The surge protector according to claim 1, characterized in that: The housing (1) is provided with an indication window (12), and the indication member (4) is provided with an indication mark (42); when the indication member (4) is located at a first position, the indication mark (42) is misaligned with the indication window (12); when the indication member (4) is located at a second position, the indication mark (42) is opposite to the indication window (12).

9. The surge protector according to claim 1, characterized in that: The indicating member (4) is provided with at least one guiding portion (43), a guiding groove (13) corresponding to the guiding portion (43) is provided in the housing (1), and the guiding portion (43) is slidably inserted in the guiding groove (13).

10. The surge protector according to claim 1, characterized in that: A spring (7) is provided between the indicating member (4) and the housing (1), and the elastic force direction of the spring (7) is the same as the moving direction of the indicating member (4).

11. The surge protector according to claim 1, characterized in that: The nonlinear element (2) is located between a first wiring board (5) and a second wiring board (6); the elastic member (3) is arranged on the nonlinear element (2); the indicating member (4) is arranged on the nonlinear element (2) and overlaps with the elastic member (3); the elastic member (3) and the indicating member (4) are arranged at an angle.

12. The surge protector according to claim 1, characterized in that: The nonlinear element (2) is a varistor.

13. The surge protector according to claim 8, characterized in that: The indicator (4) is a U-shaped structure, and the side walls of the U-shaped structure form two guide parts (43), wherein the guide part (43) close to the indicator window (12) is provided with an indicator mark (42) on the side facing the indicator window (12), and a matching surface (41) is provided on the inner side of the middle part of the indicator (4).

14. The surge protector according to claim 1, characterized in that: The indicating member (4) is arranged to move linearly.

Images