Multi-pole surge protection device

Abstract

The multi-pole surge protection devices are arranged in the width direction of the surge protection devices, each pole of surge protection device comprises a shell, a first wiring terminal, a first contact plate, a non-linear element and a thermal separation piece, the first contact plate is electrically connected between the first wiring terminal and a first pin of the non-linear element, and the thermal separation piece is electrically connected between the first wiring terminal and a second pin of the non-linear element. The one-pole surge protection device further comprises a second wiring terminal and a second contact plate, the second contact plate comprises a connecting part and a wiring part electrically connected with the second wiring terminal, the shell is provided with through holes penetrating through the shell, the connecting part penetrates into the through holes, and the connecting part is electrically connected with the second wiring terminal. And is in contact connection with the thermal disengagement member. According to the multi-pole surge protection device, the second contact plate electrically connected with the second wiring terminal is arranged, the connecting part of the second contact plate connects the thermal disengagement pieces of all the pole surge protection devices to share the second wiring terminal serving as the wire outlet end, and inter-pole connection can be carried out through the internal connecting part only by connecting one wire.

Description

TECHNICAL FIELD

[0001] The utility model relates to low-voltage electrical appliance field, concretely relates to a multi-pole surge protector. BACKGROUND

[0002] The existing multi-pole surge protector generally adopts busbar or external wire jumper when connecting the electrical wiring between poles, so that two wires need to be connected in one terminal block, which will affect the wiring capacity and connection reliability.

[0003] The conductive structure of the commonly used surge protector on the market is often bent, resulting in a long line and increased impedance due to eddy current at the bent part. Since the current of the surge protector when discharging lightning energy is in kA unit, the increased impedance will cause the residual voltage (i.e. limiting voltage Up) to rise, affecting the protection effect. SUMMARY

[0004] The utility model aims at overcoming at least one defect of prior art, and provides a multi-pole surge protector.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] The multi-pole surge protector is arranged along the width direction of the surge protector, each pole surge protector includes a shell, a first wiring terminal installed in the shell, a first contact plate, a nonlinear element and a thermal disengaging element, the first contact plate is electrically connected between the first wiring terminal and the first pin of the nonlinear element, the thermal disengaging element is low-temperature welded between the second pin of the nonlinear element, one pole surge protector further includes a second wiring terminal and a second contact plate, the second contact plate includes a connecting part and a wiring part electrically connected with the second wiring terminal, the shell of the multi-pole surge protector is provided with a through hole penetrating the shell along the width direction of the surge protector and corresponding to the connecting part, the connecting part penetrates into the through hole and is in contact connection with the thermal disengaging element of the multi-pole surge protector.

[0007] Optionally, the connecting part is a straight plate structure extending along the width direction of the surge protector in the length direction.

[0008] Optionally, the connecting part is a straight plate structure extending along the width direction of the surge protector in the length direction.

[0009] Optionally, the thermal disengaging element is a spring sheet structure including a straight sheet and a bent sheet, the two ends of the straight sheet are respectively connected with the second pin and the bent sheet, and the connecting part is elastically abutted on the side of the bent sheet away from the straight sheet.

[0010] Optionally, the straight piece is arranged at an angle with the second pin in the initial state, so that the end of the straight piece for connecting with the second pin is welded with the second pin in the deformed energy storage state.

[0011] Optionally, the bending piece of the thermal disengaging member comprises a straight segment, an arc segment, a first inclined segment and a second inclined segment connected in sequence, and an elastic opening is formed between the straight segment, the arc segment, the first inclined segment and the second inclined segment, the straight segment is connected with the straight piece, the first inclined segment is arranged in the direction away from the straight segment, and the second inclined segment is arranged in the direction close to the straight segment.

[0012] Optionally, the end of the thermal disengaging member for connecting with the second pin is provided with a welding hole, and the second pin is provided with a welding boss corresponding to the welding hole.

[0013] Optionally, the length direction of the thermal disengaging member is arranged along the length direction of the surge protector, and the length direction of the first pin is arranged along the length direction of the surge protector; in the per-pole surge protector, the junction of the first contact plate, the first pin, the thermal disengaging member and the second contact plate is arranged in a straight line in the length direction of the surge protector, the end of the first pin away from the first contact plate and the second pin are located on both sides of the nonlinear element in the width direction of the surge protector, and one end of the thermal disengaging member is laminated and welded on the side of the second pin away from the nonlinear element in the width direction of the surge protector.

[0014] Optionally, the per-pole surge protector further comprises an indicating member movably arranged in the housing, the thermal disengaging member is in a spring piece structure, one end of the thermal disengaging member for welding with the second pin is laminated and fixed on the indicating member in the width direction of the surge protector; the indicating member is laminated and spaced apart on the nonlinear element in the width direction of the surge protector, and can move between a first position and a second position in the width direction of the surge protector; after the welding between the thermal disengaging member and the second pin is melted, the thermal disengaging member is separated from the second pin under the action of its own elasticity, and simultaneously drives the indicating member to switch from the first position to the second position in the width direction of the surge protector.

[0015] Optionally, the second contact plate and the first contact plate are respectively located at both ends of the length direction of the surge protector, the direction from the second contact plate to the first contact plate is the length direction of the surge protector, and the length direction of the thermal disengaging member is arranged along the length direction of the surge protector; the nonlinear element is located in the middle of the surge protector between the second contact plate and the first contact plate, the nonlinear element, the indicating member and the thermal disengaging member are laminated in the width direction of the surge protector, and the length direction of the indicating member is arranged along the height direction of the surge protector.

[0016] The utility model discloses a multi -pole surge protection device, one pole surge protection device is provided with the second contact plate of second wiring terminal electricity connection in, the connection of second contact plate links all pole surge protection device's thermal disengagement piece links to share a second wiring terminal as the outgoing terminal, only need to access a line, can carry out inter -pole connection through the internal connection, and the wiring is convenient, improves the reliability of electrically conductive connection.

[0017] In addition, the connecting part is designed as a straight plate structure, which facilitates penetrating the shell of the multi-pole surge protection device.

[0018] In addition, the connecting part of the second contact plate and the bent piece of the thermal disengaging piece adopt an elastic abutting mode, realizing reliable and simple inter-pole connection.

[0019] In addition, the path of the electrically conductive structure of the surge protection device from the incoming line end to the outgoing line end is generally linear, reducing the bending structure and making the electrically conductive path the shortest, which can make the self-impedance of the surge protection device drop to the lowest when the line is struck by lightning, thereby making Up drop to the lowest, and better playing a protection effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the structure schematic drawing of the shell of the utility model multi -pole surge protection device hides part;

[0021] Figure 2 is the structure schematic drawing of the base of the utility model;

[0022] Figure 3 is the structure schematic drawing of the upper cover of the utility model;

[0023] Figure 4 is the structure schematic drawing of the second contact plate and the thermal disengaging piece of the utility model multi -pole surge protection device;

[0024] Figure 5 is the structure schematic drawing of the second contact plate of the utility model;

[0025] Figure 6 is the structure schematic drawing of the thermal disengaging piece of the utility model;

[0026] Figure 7 is the structure schematic drawing of the utility model single pole surge protection device;

[0027] Figure 8 is the structure schematic drawing of the electrically conductive structure of the utility model single pole surge protection device.

[0028] Housing 100; Through hole 101; Base 110; Top cover 120; First terminal block 200; First contact plate 300; Nonlinear element 400; First pin 410; Second pin 420; Welding boss 421; Thermal release component 500; Straight piece 510; Welding hole 511; Bending piece 520; Straight section 521; Arc section 522; First inclined section 523; Second inclined section 524; Elastic opening 530; Second contact plate 600; Connecting part 610; Guide part 611; Wiring part 620; Second terminal block 700; Indicator 800. Detailed Implementation

[0029] The following embodiments, in conjunction with the accompanying drawings, further illustrate the specific implementation of the multi-pole surge protector of this utility model. The multi-pole surge protector of this utility model is not limited to the descriptions in the following embodiments.

[0030] like Figures 1-3 As shown, the multi-pole surge protector of this embodiment is arranged along the width direction of the surge protector. Each pole surge protector includes a housing 100, a first terminal block 200 installed in the housing 100, a first contact plate 300, a nonlinear element 400, and a thermal disconnection element 500. The housing 100 includes a base 110 and a top cover 120, which cover the surge protector along the width direction. The first contact plate 300 is electrically connected between the first terminal 200 and the first pin 410 of the nonlinear element 400. The thermal disconnector 500 is low-temperature welded to the second pin 420 of the nonlinear element 400. The single-pole surge protector also includes a second terminal 700 and a second contact plate 600. The second contact plate 600 includes a connecting part 610 and a wiring part 620 electrically connected to the second terminal 700. The housing 100 of the multi-pole surge protector is provided with through holes 101 that are provided along the width direction of the surge protector and are corresponding to the connecting part 610. The connecting part 610 passes through the through hole 101 and is in contact with the thermal disconnector 500 of the multi-pole surge protector.

[0031] It should be noted that the width direction of the surge protector is... Figure 2 In the vertical direction of the drawing, the length direction of the surge protector is... Figure 2 The surge protector's height is in the left-right direction. Figure 2 The first terminal 200 is the power input terminal, and the second terminal 700 is the power output terminal. The first pin 410 of the nonlinear element 400 is electrically connected to the first contact plate 300 by spot welding or soldering. The second pin 420 is soldered to the thermal release component 500 using low-temperature solder wire to achieve low-temperature welding, that is, the welding between the second pin 420 and the thermal release component 500 can be thermally melted to detach the second pin 420 from the thermal release component 500.

[0032] The multi-pole surge protector of the embodiment, wherein a second contact plate 600 electrically connected with the second terminal 700 is arranged in the pole surge protector, and the connecting part 610 of the second contact plate 600 connects the thermal disengaging members 500 of all the pole surge protectors to share one second terminal 700 as an outlet terminal, so that only one wire needs to be connected, and the inter-pole connection is achieved through the internal connecting part 610, facilitating the wiring and improving the reliability of the conductive connection.

[0033] As shown in Figure 1 and Figure 5 , the connecting part 610 is a straight plate structure extending in the length direction along the width direction of the surge protector and is made of a rigid material such as copper. The connecting part 610 is designed as a straight plate structure to facilitate the penetration of the shell 100 of the multi-pole surge protector.

[0034] Preferably, the connecting part 610 is a T-shaped straight plate structure, the width direction of which is arranged along the height direction of the surge protector, and the thickness direction of which is arranged along the length direction of the surge protector; the terminal part 620 is a straight plate structure connected perpendicularly with the connecting part 610, the width direction of the terminal part 620 is arranged along the width direction of the surge protector, the length direction of the terminal part 620 is arranged along the length direction of the surge protector, and the thickness direction of the terminal part 620 is arranged along the height direction of the surge protector. In the embodiment, the pole surge protector provided with the second terminal 700 and the second contact plate 600 is arranged at a middle position in the plurality of surge protectors, for example, at a central position in the plurality of surge protectors or at a position next to the outermost position in the plurality of surge protectors. Of course, the connecting part 610 can also be an L-shaped straight plate structure, and the pole surge protector provided with the second terminal 700 and the second contact plate 600 is arranged at the outermost position in the plurality of surge protectors.

[0035] Further, the two ends of the length direction of the connecting part 610 are respectively provided with guide parts 611, which are wedge-shaped structures for guiding the penetration of the connecting part 610 into the through hole 101.

[0036] As shown in Figure 4 and Figure 6 , the thermal disengaging member 500 is a spring sheet structure made of an elastic material (tin bronze, beryllium bronze, stainless steel, etc.), including a straight sheet 510 and a bent sheet 520, the two ends of the straight sheet 510 are respectively connected with the second pin 420 and the bent sheet 520, and the connecting part 610 of the second contact plate 600 elastically abuts on the side of the bent sheet 520 away from the straight sheet 510. The connecting part 610 of the second contact plate 600 and the bent sheet 520 of the thermal disengaging member 500 adopt an elastic abutting mode to achieve reliable and simple inter-pole connection.

[0037] Furthermore, the straight piece 510 of the thermal release component 500 is initially positioned at an angle to the second pin 420. This allows the end of the straight piece 510 used to connect to the second pin 420 to be welded to the second pin 420 in a deformed, energy-storing state. After the weld between the end of the straight piece 510 and the second pin 420 melts, the straight piece 510 releases its energy and returns to its initial state, i.e., it returns to being positioned at an angle to the second pin 420. After the weld melts, the thermal release component 500 can automatically spring away from the second pin 420, improving the reliability of the surge protector's thermal release. Preferably, the angle between the straight piece 510 and the second pin 420 in the initial state is 20° to 45°. This avoids elastic failure due to excessive deformation and also ensures that the piece is at a sufficiently large distance from the second pin 420 after the weld melts, improving the reliability of the surge protector's protection function.

[0038] Specifically, the bent piece 520 of the heat release component 500 includes a straight segment 521, an arc segment 522, a first inclined segment 523, and a second inclined segment 524 connected in sequence. The straight segment 521, the arc segment 522, the first inclined segment 523, and the second inclined segment 524 form an elastic opening 530. The straight segment 521 is connected to the straight piece 510. Preferably, the straight segment 521 is perpendicular to the straight piece 510, that is, the width direction of the straight segment 521 is parallel to the width direction of the straight piece 510 and the length direction is perpendicular to the straight piece 510. The first inclined segment 523 is inclined away from the straight segment 521, and the second inclined segment 524 is inclined towards the straight segment 521, thereby forming an elastic opening 530 that is narrow at the entrance and wide at the bottom. The bent piece 520 has a U-shaped structural design, combining elasticity and toughness to improve the reliability and stability of the elastic contact between the connecting part 610 of the second contact plate 600 and the bent piece 520 of the thermal release member 500. Of course, the bent piece 520 can also be a V-shaped, arc-shaped, or other structure.

[0039] The heat release component 500 has a welding hole 511 at one end connected to the second pin 420, and the second pin 420 has a welding boss 421 corresponding to the welding hole 511. The welding hole 511 in the heat release component 500 facilitates the flow of molten solder when welding with the second pin 420, and the welding boss 421 on the second pin 420 increases the welding strength. Preferably, the welding hole 511 is a circular hole structure, and the welding boss 421 is a non-circular structure, with welding gaps formed between its two sides and the sidewalls of the welding hole 511. The welding boss 421 also has a connecting groove for connecting the two welding gaps, so that the solder forms an "I"-shaped structure after solidification. Of course, the welding hole 511 and the welding boss 421 can also be configured with other shapes, such as circular, annular, or other shapes after the solder solidifies.

[0040] likeFigure 1 and Figure 4 As shown in the drawings, the length direction of the thermal disengaging piece 500 is arranged along the length direction of the surge protector, the width direction is arranged along the height direction of the surge protector, the length direction of the first pin 410 is arranged along the length direction of the surge protector, and the width direction is arranged along the height direction of the surge protector; in the each-pole surge protector, the junction part 610 of the first contact plate 300, the first pin 410, the thermal disengaging piece 500 and the second contact plate 600 are arranged in a straight line along the length direction of the surge protector, the end of the first pin 410 away from the first contact plate 300 and the second pin 420 are located on both sides of the nonlinear element 400 along the width direction of the surge protector, and one end of the thermal disengaging piece 500 is laminated and welded on the side of the second pin 420 away from the nonlinear element 400 along the width direction of the surge protector. The path of the conductive structure of the surge protector from the incoming line end to the outgoing line end is generally straight, the bending structure is reduced, the conductive path is made to be the shortest, the self-impedance of the surge protector can be reduced to the lowest when the line is struck by lightning, so that the Up is reduced to the lowest, and the protection effect is better.

[0041] As other embodiments, the design that the path of the conductive structure of the surge protector from the incoming line end to the outgoing line end is generally straight is applied to the single-pole surge protector, as shown in the drawings, the difference between the single-pole surge protector and the multi-pole surge protector is that the junction part 610 of the second contact plate 600 is different, the junction part 610 of the single-pole surge protector is a straight plate structure extending along the width direction of the surge protector, and the through hole 101 corresponding to the junction part 610 is not arranged on the shell 100. Figure 7 and Figure 8 As shown in the drawings, the difference between the single-pole surge protector and the multi-pole surge protector in the embodiment is that the structure of the junction part 610 of the second contact plate 600 is different, the junction part 610 of the embodiment is a straight plate structure extending along the width direction of the surge protector, and the through hole 101 corresponding to the junction part 610 is not arranged on the shell 100.

[0042] The failure indication technology of the surge protector has various implementations, and one optional way is that the each-pole surge protector further comprises an indication piece 800 movably arranged in the shell 100, one end of the thermal disengaging piece 500 for welding with the second pin 420 (i.e. the end of the straight piece 510 away from the bent piece 520) is laminated and fixed on the indication piece 800 along the width direction of the surge protector; the indication piece 800 is laminated and spaced on the nonlinear element 400 along the width direction of the surge protector, and can move between the first position and the second position along the width direction of the surge protector.

[0043] In the normal state of the surge protector, the straight piece 510 of the thermal disengaging piece 500 is welded with the second pin 420 of the nonlinear element 400; when the nonlinear element 400 generates heat under the fault current / voltage, the welding between the thermal disengaging piece 500 and the second pin 420 is melted, the thermal disengaging piece 500 is separated from the second pin 420 under the action of the self elasticity, and the indicating piece 800 is simultaneously driven to switch from the first position to the second position along the width direction of the surge protector, so that the fault indication is realized. Of course, other existing fault indication technologies can also be used.

[0044] It should be noted that the upper end of the indicating piece 800 is provided with an indicating mark, and the shell 100 is provided with an indicating window corresponding to the indicating mark, the position change of the indicating piece 800 can be displayed by different indicating marks in the indicating window, and the fault indication function is realized. The indicating mark can be one or a combination of colors, words, symbols, patterns and the like.

[0045] Specifically, the second contact plate 600 and the first contact plate 300 are located at two ends of the length direction of the surge protector, the direction from the second contact plate 600 to the first contact plate 300 is the length direction of the surge protector, and the length direction of the thermal disengaging piece 500 is arranged along the length of the surge protector; the nonlinear element 400 is located in the middle part of the surge protector and between the second contact plate 600 and the first contact plate 300, the nonlinear element 400, the indicating piece 800 and the thermal disengaging piece 500 are stacked in the width direction of the surge protector, and the length direction of the indicating piece 800 is arranged along the height of the surge protector.

[0046] It should be noted that in the description of the utility model, 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 in use, and are only for the convenience of description, and cannot be understood as indicating that the device or element referred to must have a specific orientation, therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating relative importance.

[0047] The above content is a further detailed description of the utility model in combination with the specific preferred embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the utility model belongs, without departing from the concept of the utility model, a number of simple deductions or substitutions can be made, and all of them should be regarded as falling within the protection scope of the utility model.

Claims

1. A multi-pole surge protector arranged in a width direction of the surge protector, each pole of the surge protector comprising a housing (100), a first terminal (200) mounted in the housing (100), a first contact plate (300) electrically connected between the first terminal (200) and a first pin (410) of a non-linear element (400), and a thermal disconnect (500) low temperature soldered with a second pin (420) of the non-linear element (400), characterized in that: The single-pole surge protector further comprises a second terminal (700) and a second contact plate (600), the second contact plate (600) comprises a connecting part (610) and a terminal part (620) electrically connected with the second terminal (700), the housing (100) of the multi-pole surge protector is provided with a through hole (101) corresponding to the connecting part (610) and penetrating the housing (100) along the width direction of the surge protector, the connecting part (610) penetrates into the through hole (101) and is in contact connection with the thermal disengaging element (500) of the multi-pole surge protector.

2. The multi-pole surge protector of claim 1, wherein: The connecting part (610) is a straight plate structure extending along the length direction of the width direction of the surge protector.

3. The multi-pole surge protector of claim 2, wherein: The connecting part (610) is provided with a guide part (611) at each end along the length direction, and the guide part (611) is a wedge-shaped structure.

4. The multi-pole surge protector of claim 1, wherein: The thermal disengaging element (500) is a spring sheet structure comprising a straight sheet (510) and a bent sheet (520), two ends of the straight sheet (510) are connected with the second pin (420) and the bent sheet (520) respectively, and the connecting part (610) elastically abuts on one side of the bent sheet (520) away from the straight sheet (510).

5. The multi-pole surge protector of claim 4, wherein: The straight sheet (510) is arranged at an angle with the second pin (420) in the initial state, so that one end of the straight sheet (510) for connecting with the second pin (420) is welded together with the second pin (420) in the energy storage state.

6. The multi-pole surge protector of claim 4, wherein: The bent sheet (520) of the thermal disengaging element (500) comprises a straight section (521), an arc section (522), a first inclined section (523) and a second inclined section (524) connected in sequence, an elastic port (530) is formed between the straight section (521), the arc section (522), the first inclined section (523) and the second inclined section (524), the straight section (521) is connected with the straight sheet (510), the first inclined section (523) is arranged in an inclined manner away from the straight section (521), and the second inclined section (524) is arranged in an inclined manner towards the straight section (521).

7. The multi-pole surge protector of claim 1, wherein: The thermal disengaging element (500) is provided with a welding hole (511) at one end connected with the second pin (420), and the second pin (420) is provided with a welding boss (421) corresponding to the welding hole (511).

8. The multi-pole surge protector of claim 1, wherein: The length direction of the thermal disengaging piece (500) is arranged along the length direction of the surge protector, and the length direction of the first pin (410) is arranged along the length direction of the surge protector; in the per-pole surge protector, the first contact plate (300), the first pin (410), the thermal disengaging piece (500) and the joint (610) of the second contact plate (600) are arranged in a straight line in the length direction of the surge protector, and the end of the first pin (410) away from the first contact plate (300) and the second pin (420) are located on both sides of the nonlinear element (400) in the width direction of the surge protector, and one end of the thermal disengaging piece (500) is laminated and welded on the side of the second pin (420) away from the nonlinear element (400) in the width direction of the surge protector.

9. The multi-pole surge protector of claim 1, wherein: The per-pole surge protector further comprises an indicating piece (800) movably arranged in the housing (100), the thermal disengaging piece (500) is in a spring sheet structure, and the end of the thermal disengaging piece (500) welded with the second pin (420) is laminated and fixed on the indicating piece (800) in the width direction of the surge protector; the indicating piece (800) is arranged in a laminated and spaced manner on the nonlinear element (400) in the width direction of the surge protector and can move between a first position and a second position in the width direction of the surge protector; after the welding between the thermal disengaging piece (500) and the second pin (420) is melted by heat, the thermal disengaging piece (500) is separated from the second pin (420) under the action of its own elasticity, and simultaneously drives the indicating piece (800) to switch from the first position to the second position in the width direction of the surge protector.

10. The multi-pole surge protector of claim 9, wherein: The second contact plate (600) and the first contact plate (300) are respectively located at both ends of the length direction of the surge protector, the direction from the second contact plate (600) to the first contact plate (300) is the length direction of the surge protector, and the length direction of the thermal disengaging piece (500) is arranged along the length direction of the surge protector; the nonlinear element (400) is located in the middle of the surge protector between the second contact plate (600) and the first contact plate (300), the nonlinear element (400), the indicating piece (800) and the thermal disengaging piece (500) are arranged in a laminated manner in the width direction of the surge protector, and the length direction of the indicating piece (800) is arranged along the height direction of the surge protector.

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