Lightning protection device

Abstract

The utility model discloses a lightning protection device which comprises a surge protector body and a backup protector detachably arranged in the surge protector body, the backup protector comprises a tripping sliding block, a spring, a piezoresistor and a bimetallic strip, the bimetallic strip is fixedly connected with the tripping sliding block and abuts against a leading-out pin of the piezoresistor, and the tripping sliding block is connected with the spring. The trigger is used for triggering the tripping slide block to move; the spring abuts against the inner wall of the backup protector and the tripping sliding block, acts on the tripping sliding block and is used for opening the surge protector body. According to the utility model, the motion speed of the tripping slide block is accelerated through the cooperation of the bimetallic strip with the spring after the bimetallic strip is heated to expand and deform, so that the moving plate and the conductive protection block are electrically connected and separated, and the normal use of the tripping slide block, the spring and the bimetallic strip is prevented from being influenced by the explosion of the piezoresistor through the partition plate, thereby ensuring the timely breaking of the surge protector body and ensuring the safety of a circuit. And the product has the advantages of high sensitivity, small overall size, high safety and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of lightning protection equipment, in particular to a lightning protection device. Background Art

[0002] Surge Protective Device (SPD), also known as lightning arrester, is an electronic device that provides safety protection for various electronic equipment, instruments and communication lines. 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 in a very short time, thereby preventing the surge from damaging other devices in the circuit.

[0003] To ensure the safe and effective operation of the SPD in the system, a backup protector will be connected in series at the front end of the SPD. When the SPD deteriorates (suffering from lightning current shock or transient overvoltage shock), causing the starting voltage to drop below the power supply voltage, the power frequency leakage current will increase rapidly. When this current is only a few amperes, the SPD thermal trip mechanism can disconnect the circuit. When the current is greater than 10A, the SPD heats up and burns faster than the heat transfer speed, which means that the SPD has caught fire before the heat transfer reaches the tripping temperature. At this time, the backup protector will disconnect the circuit before causing the SPD to catch fire, thereby preventing the occurrence of fire.

[0004] According to the "A surge protector with a special protection function of remote signaling alarm" with authorization announcement number CN216751173U, the tripping tension spring and the tripping indication slider of the backup protector occupy a large space of the inner core shell, which requires the size of the inner core shell to be enlarged during design. The overall volume of the two connected in series is large, which is not conducive to installation inside some equipment with high space requirements. Moreover, the manual assembly of the two tripping tension springs takes a long time, which is not conducive to automated production. Moreover, the varistor and the tripping tension spring, the tripping indication slider, the tripping electrode and other components are installed in the same space. When the varistor is overheated or over-voltage, it will cause the varistor to explode, causing the backup protector to lose the function of triggering the tripping mechanism, thereby failing to protect the line safety. Therefore, the applicant has made a beneficial design and found a solution to the above-mentioned problem. The technical solution to be introduced below was produced in this context. Summary of the invention

[0005] The purpose of the utility model is to overcome the shortcomings of the above technical solutions and provide a product with small overall volume, easy assembly and reduced production cost.

[0006] To solve the above problems, the utility model adopts the following technical solutions.

[0007] A lightning protection device, comprising a surge protector body, and a backup protector detachably arranged therein, characterized in that: the backup protector comprises a tripping slider, a spring, a varistor, and a bimetallic strip, the bimetallic strip being connected and fixed to the tripping slider and abutting against the lead-out pin of the varistor to trigger the movement of the tripping slider; the spring abutting against the inner wall of the backup protector and the tripping slider, and acting on the tripping slider to open the surge protector body;

[0008] Preferably, the surge protector body includes an operating handle, a connecting rod, a trip buckle, a lock buckle, a movable plate, an arc extinguishing fence, a first static plate, a second static plate, a conductive protection block, and a tripping coil. The armature ejection direction of the tripping coil is aligned with the lock buckle. One end of the connecting rod is mounted on the operating handle, and the other end is mounted on the trip buckle. The trip buckle cooperates with the lock buckle to lock. The movable plate is connected and fixed to the trip buckle and is arranged in the arc extinguishing fence. A soft connecting wire is provided between the movable plate and the first static plate, and the movement direction of the movable plate is aligned with the lead-out pin of the conductive protection block.

[0009] Preferably, the backup protector is provided with a partition to form a first cavity and a second cavity, the varistor is fixed in the first cavity, the partition is provided with a first notch and a second notch, the first notch is connected to the second cavity, one of the lead pins of the varistor passes through the first notch and abuts against the bimetallic strip, the lead pin of the other varistor is arranged in the second notch, and the side wall of the second cavity is provided with a cylinder.

[0010] Preferably, the second concave cavity is provided with a cover plate, the cover plate is provided with a plurality of blind holes, the second concave cavity is provided with a connecting column, and is inserted into the blind hole, the cover plate is connected and fixed to the second concave cavity by interference fit, the cover plate and the side wall of the second concave cavity are provided with limiting through holes, and the second concave cavity is provided with a movable through hole.

[0011] Preferably, the tripping slider is provided with a pressure-bearing surface, the spring is arranged on the outer wall of the cylinder and abuts the pressure-bearing surface, the tripping slider is also provided with a push rod, which is arranged in the movable through hole and aligned with the armature of the tripping coil, and movable grooves are provided on both sides of the tripping slider.

[0012] Preferably, the limiting through hole is provided with a pull ring, and both ends of the pull ring abut against the movable groove.

[0013] Preferably, the bimetallic strip is provided with an insert, and the shape of the bimetallic strip is set to be an arc.

[0014] The surge protector body is provided with a first spring sheet and a second spring sheet, the first spring sheet acts on the lead-out pins of the plug-in piece and the conductive protection block, the second spring sheet is connected and fixed to the second static sheet, the second spring sheet acts on the lead-out pins of the varistor, and the first static sheet and the second static sheet are provided with connection terminals.

[0015] Beneficial effects:

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] (1) According to the utility model, when the system has an overvoltage fault, the temperature of the varistor and the conductive protection block rises, accelerating the thermal conductivity of the bimetallic strip. The arc-shaped bimetallic strip expands and deforms due to the heat, driving the trip slider to move. The reaction force of the spring accelerates the movement speed of the trip slider. The high-speed moving push rod pushes the armature of the trip coil to move, pushing the lock to unlock. Under the action of the reaction force, the movable plate and the conductive protection block are quickly disconnected, making the product have the advantage of high sensitivity.

[0018] (2) The utility model divides and fixes the spring, the trip slider, the bimetallic strip, and the varistor in the first cavity and the second cavity to prevent the varistor from exploding due to overheating, overpressure, and other factors. The partition is used to prevent the explosion of the varistor from affecting the normal use of the trip slider, the spring, and the bimetallic strip, thereby ensuring that the surge protector body is disconnected in time and the safety of the circuit. In addition, through the optimization of the above structure, the tension spring is replaced by a spring, which is convenient for automated production or manual assembly. While reducing the number of parts, it is ensured that the backup protector still has the function of a quick disconnection operating mechanism, so that the product has the advantages of small overall size and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a lightning protection device of the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of a lightning protection device of the utility model;

[0021] Figure 3 It is a schematic diagram of the side cross-section structure of a lightning protection device of the utility model;

[0022] Figure 4 This is a structural schematic diagram of a cover plate of a lightning protection device of the utility model;

[0023] The corresponding relationship between the illustrations and component names in the figure is as follows:

[0024] Figure numerals: 1, surge protector body; 2, backup protector; 3, partition; 4, first concave cavity; 5, second concave cavity; 6, cover plate; 7, limit through hole; 8, terminal; 11, operating mechanism; 12, moving piece; 13, arc extinguishing fence; 14, first static piece; 15, second static piece; 16, conductive protection block; 17, tripping coil; 18, first spring piece; 19, second spring piece; 111, operating handle ; 112, connecting rod; 113, jump buckle; 114, lock buckle; 115, flexible connecting wire; 21, release slider; 22, spring; 23, varistor; 24, bimetallic strip; 211, pressure-bearing surface; 212, push rod; 213, movable groove; 241, insert; 31, first notch; 32, second notch; 51, cylinder; 52, connecting column; 53, movable through hole; 61, blind hole; 71, pull ring. DETAILED DESCRIPTION

[0025] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left" and "right" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0027] Reference example Figures 1 to 4 A lightning protection device includes a surge protector body 1 and a backup protector 2 detachably arranged therein, wherein the backup protector 2 includes a trip slider 21, a spring 22, a varistor 23, and a bimetallic strip 24, wherein the bimetallic strip 24 is fixedly connected to the trip slider 21 and abuts against the lead-out pin of the varistor 23 to trigger the movement of the trip slider 21; the spring 22 abuts against the inner wall of the backup protector 2 and the trip slider 21, and acts on the trip slider 21 to open the surge protector body 1, and the connection method between the bimetallic strip 24 and the trip slider 21 can be a variety of connection methods such as hot injection molding, hot riveting, and screw fixing, which can be changed according to customer needs and product requirements;

[0028] It is worth mentioning that the surge protector body 1 includes an operating handle 111, a connecting rod 112, a trip buckle 113, a lock buckle 114, a movable plate 12, an arc extinguishing fence 13, a first static plate 14, a second static plate 15, a conductive protection block 16, and a tripping coil 17. The armature ejection direction of the tripping coil 17 is aligned with the lock buckle 114. One end of the connecting rod 112 is mounted on the operating handle 111, and the other end is mounted on the trip buckle 113. The trip buckle 113 cooperates with the lock buckle 114 to lock. The movable plate 12 is connected and fixed to the trip buckle 113 and is arranged in the arc extinguishing fence 13. A soft connecting wire 115 is provided between the movable plate 12 and the first static plate 14, and the movement direction of the movable plate 12 is aligned with the lead-out pin of the conductive protection block 16. A flexible connecting wire 115 is provided between the moving piece 12 and the first static piece 14. The operating handle 111 is pulled to make it move, and the trip buckle 113 and the lock buckle 114 are linked with the operating handle 111 through the connecting rod 112. The lock buckle 114 fixes the trip buckle 113 at the position after the movement. The flexible connecting wire 115 facilitates the moving piece 12 to move with the trip buckle 113. At the moment when the moving piece 12 and the lead-out pin of the conductive protection block 16 are disconnected, the generated arc is extinguished by the arc extinguishing grid. A plurality of stacked graphite sheets are provided inside the conductive protection block 16. When the line is struck by lightning, the lightning energy is gradually released by a graded discharge method to ensure the safety of the line.

[0029] It is worth mentioning that the backup protector 2 is provided with a partition 3 to form a first concave cavity 4 and a second concave cavity 5. The varistor 23 is fixed in the first concave cavity 4. The partition 3 is provided with a first notch 31 and a second notch 32. The first notch 31 is connected to the second concave cavity 5. One of the lead pins of the varistor 23 passes through the first notch 31 and abuts against the bimetallic strip 24. The lead pin of the other varistor 23 is arranged in the second notch 32. The side wall of the second concave cavity 5 is provided with a cylinder 51. The partition 3 plays a role in dividing the space and blocking the explosion of the varistor 23. The first notch 31 and the second notch 32 facilitate the connection between the lead pins of the varistor 23 and the bimetallic strip 24 and the first and second spring sheets 19. The cylinder 51 prevents the spring 22 from falling off during the activity.

[0030] It is worth mentioning that the second concave cavity 5 is provided with a cover plate 6, and the cover plate 6 is provided with a plurality of blind holes 61. The second concave cavity 5 is provided with a connecting column 52, which is inserted into the blind hole 61. The cover plate 6 is connected and fixed to the second concave cavity 5 by interference fit. The side walls of the cover plate 6 and the second concave cavity 5 are provided with a limiting through hole 7. The second concave cavity 5 is provided with a movable through hole 53. The cover plate 6 plays a role in protecting the spring 22, the tripping slider 21, and the bimetallic strip 24 to prevent accidental touch by personnel. The connecting column 52 cooperates with the blind hole 61 to connect and fix the cover plate 6 to the second concave cavity 5. The limiting through hole 7 is used in conjunction with the pull ring 71. The movable through hole 53 facilitates the extension or retraction of the ejector rod 212.

[0031] It is worth mentioning that the tripping slider 21 is provided with a pressure-bearing surface 211, the spring 22 is arranged on the outer wall of the cylinder 51 and abuts against the pressure-bearing surface 211, the tripping slider 21 is also provided with a push rod 212, and is arranged in the movable through hole 53 and aligned with the armature of the tripping coil 17, and movable grooves 213 are provided on both sides of the tripping slider 21. The reaction force of the spring 22 is transmitted to the tripping slider 21 through the pressure-bearing surface 211. The push rod 212 is a trigger mechanism for triggering the armature movement of the tripping coil 17. When the tripping slider 21 moves, both ends of the pull ring 71 can move in the movable grooves 213;

[0032] It is worth mentioning that the limiting through hole 7 is provided with a pull ring 71, and both ends of the pull ring 71 pass through the limiting through hole 7 and abut against the movable groove 213. The backup protector 2 can be pulled out from the surge protector body 1 through the pull ring 71, and a new backup protector 2 is replaced. A downward pressure is applied to the backup protector 2, so that the plug 241 enters between the first spring sheet 18 and the lead pin of the conductive protection block 16, and the lead pin of the varistor 23 is subjected to the reaction force of the second spring sheet 19, so that the backup protector 2 is electrically connected and fixed to the surge protector body 1;

[0033] It is worth mentioning that the bimetallic strip 24 is provided with an insert 241, and the shape of the bimetallic strip 24 is set to be an arc. The insert 241 cooperates with the first elastic sheet 18 to not only play a fixing role, but also play a role of electrical connection and heat conduction. The arc shape can make the bimetallic strip 24 expand due to heat and drive the tripping slider 21 to move;

[0034] It is worth mentioning that the surge protector body 1 is provided with a first spring clip 18 and a second spring clip 19. The first spring clip 18 acts on the lead-out pins of the plug-in piece 241 and the conductive protection block 16. The second spring clip 19 is connected and fixed to the second static piece 15. The second spring clip 19 acts on the lead-out pins of the varistor 23. The first static piece 14 and the second static piece 15 are provided with connection terminals 8. The first spring clip 18 and the second spring clip 19 ensure that the lead-out pins of the plug-in piece 241 and the conductive protection block 16, and the lead-out pins of the varistor 23 and the second static piece 15 are electrically connected and fixed.

[0035] The use principle of the utility model is now described as follows:

[0036] Example 1

[0037] When the system has an overvoltage fault, the varistor 23 and the conductive protection block 16 will heat up rapidly due to overvoltage and overcurrent, and conduct heat to the plug 241 and the bimetallic strip 24 through the lead-out pins. The bimetallic strip 24 expands and deforms due to the heat, driving the trip slider 21 to move in the direction of the trip coil 17 and separate from the lead-out pin of the varistor 23. The spring 22 releases the reaction force to accelerate the movement speed of the trip slider 21. The force of the top rod 212 is greater than the reaction force of the trip coil 17. The spring 22 attracts the armature force, causing the armature to move instantly and push the lock 114 to unlock. At the moment the lock 114 is unlocked, the trip buckle 113 moves instantly under the action of the reaction force, causing the movable piece 12 and the lead-out pin of the conductive protection block 16 to be instantly disconnected. The arc generated at the moment of disconnection is extinguished by the arc extinguishing fence 13. At this time, the electrical connection between the second static piece 15 and the first static piece 14 is interrupted, and the surge protector body 1 is disconnected.

[0038] Example 2

[0039] When the power frequency fault current passes through the line, the large current causes the trip coil 17 to generate a sufficiently large magnetic field force to overcome the force of the reaction spring 22 to attract the armature, causing the armature to move instantly and push the lock 114 to unlock. At the moment the lock 114 is unlocked, the trip buckle 113 moves instantly under the action of the reaction force, causing the movable piece 12 and the lead-out pin of the conductive protection block 16 to be instantly disconnected. The arc generated at the moment of disconnection is extinguished by the arc extinguishing fence 13. At this time, the electrical connection between the second static piece 15 and the first static piece 14 is interrupted, and the surge protector body 1 is opened.

[0040] The above design scheme can make the product achieve the advantages of high sensitivity, small overall size and high safety.

[0041] The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.

Claims

1. A lightning protection device, comprising a surge protector body (1), and a backup protector (2) detachably arranged therein, characterized in that: The backup protector (2) comprises a tripping slider (21), a spring (22), a varistor (23), and a bimetallic strip (24); the bimetallic strip (24) is connected to the tripping slider (21) and abuts against the lead pin of the varistor (23) to trigger the movement of the tripping slider (21); the spring (22) abuts against the inner wall of the backup protector (2) and the tripping slider (21) and acts on the tripping slider (21) to open the surge protector body (1).

2. The lightning protection device according to claim 1, characterized in that: The surge protector body (1) comprises an operating handle (111), a connecting rod (112), a tripping buckle (113), a locking buckle (114), a moving piece (12), an arc extinguishing fence (13), a first static piece (14), a second static piece (15), a conductive protection block (16), and a tripping coil (17). The armature ejection direction of the tripping coil (17) is aligned with the locking buckle (114). One end of the connecting rod (112) is mounted on the operating handle (111), and the other end is mounted on the tripping buckle (113). The tripping buckle (113) is locked in cooperation with the locking buckle (114). The moving piece (12) is connected and fixed to the tripping buckle (113) and is arranged on the arc extinguishing fence (13). A flexible connecting wire (115) is arranged between the moving piece (12) and the first static piece (14). The moving direction of the moving piece (12) is aligned with the lead-out pin of the conductive protection block (16).

3. The lightning protection device according to claim 2, characterized in that: The backup protector (2) is provided with a partition (3) to form a first concave cavity (4) and a second concave cavity (5); the varistor (23) is fixed in the first concave cavity (4); the partition (3) is provided with a first notch (31) and a second notch (32); the first notch (31) is connected to the second concave cavity (5); one of the lead pins of the varistor (23) passes through the first notch (31) and abuts against the bimetallic strip (24); the lead pin of the other varistor (23) is arranged in the second notch (32); and a cylinder (51) is provided on the side wall of the second concave cavity (5).

4. The lightning protection device according to claim 3, characterized in that: The second concave cavity (5) is provided with a cover plate (6), the cover plate (6) is provided with a plurality of blind holes (61), the second concave cavity (5) is provided with a connecting column (52) and is inserted into the blind hole (61), the cover plate (6) and the second concave cavity (5) are connected and fixed by interference fit, the side walls of the cover plate (6) and the second concave cavity (5) are provided with limiting through holes (7), and the second concave cavity (5) is provided with a movable through hole (53).

5. The lightning protection device according to claim 4, characterized in that: The tripping slider (21) is provided with a pressure-bearing surface (211), the spring (22) is arranged on the outer wall of the cylinder (51) and abuts against the pressure-bearing surface (211), the tripping slider (21) is also provided with a push rod (212), and is arranged in the movable through hole (53) and aligned with the armature of the tripping coil (17), and movable grooves (213) are provided on both sides of the tripping slider (21).

6. The lightning protection device according to claim 5, characterized in that: The limiting through hole (7) is provided with a pull ring (71), and both ends of the pull ring (71) abut against the movable groove (213).

7. The lightning protection device according to claim 6, characterized in that: The bimetallic strip (24) is provided with an inserting strip (241), and the shape of the bimetallic strip (24) is set to be an arc.

8. The lightning protection device according to claim 7, characterized in that: The surge protector body (1) is provided with a first spring piece (18) and a second spring piece (19); the first spring piece (18) acts on the lead-out pins of the plug piece (241) and the conductive protection block (16); the second spring piece (19) is connected and fixed to the second static piece (15); the second spring piece (19) acts on the lead-out pins of the varistor (23); the first static piece (14) and the second static piece (15) are provided with connection terminals (8).

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