Surge protection device with backup protection function

Abstract

The utility model discloses a surge protection device with a backup protection function, which is characterized in that a tripping mechanism is arranged at the upper end inside a shell of the surge protection device, one end of the tripping mechanism is connected with an electromagnetic tripping device, and the other end of the tripping mechanism is in brake connection with a handle arranged outside the shell of the surge protection device; two ends of the tripping mechanism are respectively connected with a moving contact and a static contact, and the electromagnetic tripper controls the contact or separation of the moving contact and the static contact through the tripping mechanism; the piezoresistor module is arranged at the lower end in the surge protection device shell through the mounting card; and the upper wiring terminal and the lower wiring terminal are respectively connected to the left end and the right end in the surge protection device shell. According to the scheme, a backup protection structure is additionally arranged, the original equipment space is reduced, the product cost is saved, matching of product parameter characteristics is facilitated, product miniaturization is more facilitated, and dual safety and portability are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of overvoltage and lightning protection, in particular to a surge protector with a backup protection function. Background Art

[0002] Various natural disasters occur frequently in today's society, and lightning is one of them. Surge protector (SPD for short) is an indispensable device for lightning protection of electronic equipment. The function of surge protector is to limit the instantaneous overvoltage entering the power line and signal transmission line to the voltage range that the equipment or system can withstand, or to discharge the strong lightning current into the ground to protect the protected equipment or system from damage caused by the impact. The core component of SPD is varistor. Under the impact of transient overvoltage or lightning current, SPD deteriorates, and in extreme cases (such as when the SPD failure mode is short circuit, etc.), it causes electrical faults such as fire. It is necessary to install SPD protection device on the upper end of SPD in the circuit to quickly disconnect it from the power supply circuit at the moment of SPD damage. According to GB50057 Building Lightning Protection Design Specifications and GBT21431 Building Lightning Protection Device Detection Technical Specifications, "SPD installed on the circuit should have a backup protection device at the front end."

[0003] At present, the "backup protection devices" on the market mainly include: special backup protectors for surge protectors, fuses, circuit breakers and other devices. Due to the limitations of their performance and principles, or the performance cannot be fully met, or the two types of products are installed together, which increases the equipment space, increases the product cost, is not conducive to the coordination of product parameter characteristics, and is not conducive to product miniaturization.

[0004] Surge protector, also called lightning arrester, is an electronic device that provides safety protection for various electronic equipment, instruments and meters, 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 equipment in the circuit. Surge protector is suitable for AC 50 / 60HZ, rated voltage 220V / 380V power supply system, to protect against indirect lightning and direct lightning effects or other transient overvoltage surges, and is suitable for surge protection requirements in residential, tertiary industry and industrial fields.

[0005] However, the voltage-limiting surge protectors on the market all require an additional backup protector or fuse at the front end of the product to protect the surge protector in the circuit from overload, which makes the additional structure cumbersome and complicated, occupies a large volume space, is inconvenient to use, and is not portable.

[0006] To this end, we provide a surge protector with backup protection function to overcome the above problems. Utility Model Content

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide a surge protector with a backup protection function, which is used to solve the problem that existing voltage-limiting surge protectors require an additional backup protector or fuse to be added to the front end of the product before overload protection can be provided for the surge protector in the circuit.

[0008] The utility model adopts the following technical scheme to achieve the above-mentioned purpose: a surge protector with backup protection function, comprising a surge protector shell, a tripping mechanism, a discharge gap, an electromagnetic tripping device, a varistor module, an upper wiring terminal, a remote signal output terminal, and a lower wiring terminal. The surge protector is externally movably connected with the surge protector shell, and is characterized in that: the tripping mechanism is arranged at the upper end inside the surge protector shell, one end of the tripping mechanism is connected with the electromagnetic tripping device, and the other end of the tripping mechanism is connected with a handle brake installed outside the surge protector shell; the two ends of the tripping mechanism are respectively connected with a moving contact and a static contact, and the electromagnetic tripping device controls the contact or separation of the moving contact and the static contact through the tripping mechanism; the varistor module is arranged at the lower end inside the surge protector shell through an installation card; the upper wiring terminal and the lower wiring terminal are respectively connected to the left and right ends inside the surge protector shell.

[0009] In order to further improve the ease of use of a surge protector with a backup protection function, the utility model adopts a solution: the tripping mechanism includes a tripping wheel, a connecting piece, a contact seat, a lock, and a lever wheel; the top of the contact seat is connected to the lever wheel, the lever wheel is movably connected to the lock, the lever wheel is connected to the tripping wheel through a connecting piece, and a handle connecting rod is rotatably connected to the tripping wheel.

[0010] In order to further improve the convenience of using the surge protector with backup protection function, the solution adopted by the utility model is that the handle connecting rod is adaptively connected to the handle.

[0011] In order to further improve the convenience of using the surge protector with backup protection function, the solution adopted by the utility model is that the discharge gap is a gas discharge tube with inert gas or an air gap formed by metal electrodes.

[0012] In order to further improve the ease of use of a surge protector with a backup protection function, the solution adopted by the utility model is: the electromagnetic release, the moving iron core, the electromagnetic coil, the coil skeleton, the return spring and the static iron core, the left and right ends of the coil skeleton are respectively connected to the electromagnetic coil, one end of the coil skeleton is connected to the electromagnetic release, and the other end of the coil skeleton is connected to the static iron core through a return spring.

[0013] In order to further improve the convenience of using the surge protector with backup protection function, the solution adopted by the utility model is that a release ejector rod is plugged and connected to the static iron core.

[0014] In order to further improve the convenience of use of the surge protector with backup protection function, the solution adopted by the utility model is that the induced voltage generated by the power frequency current at both ends of the electromagnetic coil is smaller than the breakdown voltage of the discharge gap.

[0015] In order to further improve the ease of use of a surge protector with a backup protection function, the solution adopted by the utility model is: the varistor module includes a varistor element, a low-temperature welding point, an overheating separation mechanism, an indication mechanism and a compression spring, the varistor element is provided with a boss electrode, the low-temperature welding point is welded to the boss electrode, the overheating separation mechanism is arranged on one side inside the varistor element, and the indication mechanism is elastically arranged on the other side inside the varistor element through a compression spring.

[0016] In order to further improve the convenience of using the surge protector with backup protection function, the solution adopted by the utility model is that one side of the overheating release mechanism is electrically connected to an auxiliary remote signal output line.

[0017] In order to further improve the convenience of using the surge protector with backup protection function, the solution adopted by the utility model is: a remote signal output terminal is connected to the outer side of the surge protector housing.

[0018] The beneficial effects of the utility model are as follows: the surge protector with backup protection function is equipped with a backup protection structure, which reduces the original equipment space, saves product costs, is conducive to the coordination of product parameter characteristics, and is more conducive to product miniaturization, with dual safety and portability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the tripping mechanism of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the electromagnetic release of the utility model;

[0023] Figure 5 This is a structural schematic diagram of the varistor module of the utility model;

[0024] Figure 6 It is a schematic diagram of the working principle of the utility model.

[0025] In the figure: 1 surge protector housing, 2 tripping mechanism, 201 handle connecting rod, 202 tripping wheel, 203 connecting piece, 204 contact seat, 205 lock, 206 lever wheel, 3 moving contact, 4 static contact, 5 discharge gap, 6 electromagnetic release, 61 moving iron core, 62 electromagnetic coil, 63 coil skeleton, 64 return spring, 65 static iron core, 66 tripping ejector, 7 varistor module, 71 varistor element, 72 low-temperature welding point, 73 overheating separation mechanism, 74 indication mechanism, 75 auxiliary remote signal output line, 76 boss electrode, 77 compression spring, 8 handle, 9 upper terminal, 10 installation card, 11 remote signal output terminal, 12 lower terminal. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0027] See also Figure 1-2 and Figure 6 The utility model discloses a surge protector with backup protection function, comprising a surge protector housing 1, a tripping mechanism 2, a discharge gap 5, an electromagnetic tripping device 6, a varistor module 7, an upper wiring terminal 9, a remote signal output terminal 11, and a lower wiring terminal 12. The surge protector housing 1 is movably connected to the outside of the surge protector.

[0028] In the utility model: the tripping mechanism 2 is arranged at the upper end inside the surge protector housing 1, one end of the tripping mechanism 2 is connected to the electromagnetic tripping device 6, and the other end of the tripping mechanism 2 is brake-connected to the handle 8 installed outside the surge protector housing 1; the two ends of the tripping mechanism 2 are respectively connected to the moving contact 3 and the static contact 4, and the electromagnetic tripping device 6 controls the contact or separation of the moving contact 3 and the static contact 4 through the tripping mechanism 2; the varistor module 7 is arranged at the lower end inside the surge protector housing 1 through the installation card 10; the upper wiring terminal 9 and the lower wiring terminal 12 are respectively connected to the left and right ends inside the surge protector housing 1.

[0029] For further information, see Figure 3The tripping mechanism 2 includes a tripping wheel 202, a connecting piece 203, a contact seat 204, a lock 205, and a lever wheel 206. The top of the contact seat 204 is connected to the lever wheel 206, and the lever wheel 206 is movably connected to the lock 205. The lever wheel 206 is connected to the tripping wheel 202 through the connecting piece 203. The tripping wheel 202 is rotatably connected with a handle connecting rod 201.

[0030] Specifically, the handle connecting rod 201 is adapted to be connected with the handle 8 .

[0031] Specifically, the discharge gap 5 is a gas discharge tube with inert gas or an air gap formed by metal electrodes.

[0032] For further information, see Figure 4 The electromagnetic release 6, the moving iron core 61, the electromagnetic coil 62, the coil frame 63, the return spring 64 and the static iron core 65, the left and right ends of the coil frame 63 are respectively connected with the electromagnetic coil 62, one end of the coil frame 63 is connected to the electromagnetic release 6, and the other end of the coil frame 63 is connected to the static iron core 65 through the return spring 64. The return spring 64 is used to restore the moving iron core 61 to the position before the action state.

[0033] Specifically, a stripping ejector rod 66 is plugged and connected to the static iron core 65 .

[0034] Specifically, the induced voltage generated by the power frequency current at both ends of the electromagnetic coil 62 is less than the breakdown voltage of the discharge gap 5. The breakdown voltage of the discharge gap 5 is set to be greater than the induced voltage generated by the normal power frequency current at both ends of the electromagnetic coil 62 of the electromagnetic release 6. When the lightning current passes through, the lightning current surge voltage is greater than the ignition breakdown voltage of the discharge gap 5, and the discharge gap 5 is broken down to form a lightning current path. Due to the inductance of the electromagnetic coil 62, only a small part of the lightning current enters the power frequency circuit composed of the electromagnetic coil 62, and will not cause the electromagnetic release 6 to operate; when the power frequency current passes through or the current with a surge voltage less than the breakdown voltage of the discharge gap 5 passes through, since the discharge gap 5 cannot be broken down, the current can only pass through the power frequency current or direct current path; when the power frequency current passing through the power frequency current or direct current path is greater than the tripping current value of the electromagnetic release 6, the moving iron core of the electromagnetic release 6 hits the tripping mechanism 2, and the tripping mechanism 2 completes the tripping and changes the moving contact 3 and the static contact 4 from the contact state to the separation state.

[0035] Both the lightning current and the power frequency current pass through the varistor module 7 with overheat protection, so that the overvoltage is further limited and the safety performance is improved.

[0036] For further information, see Figure 5The varistor module 7 includes a varistor element 71, a low-temperature welding point 72, an overheating separation mechanism 73, an indicating mechanism 74 and a compression spring 77. The varistor element 71 is provided with a boss electrode 76, and the low-temperature welding point 72 is welded to the boss electrode 76. The overheating separation mechanism 73 is arranged on one side inside the varistor element 71, and the indicating mechanism 74 is elastically arranged on the other side inside the varistor element 71 through the compression spring 77.

[0037] Specifically, one side of the overheating release mechanism 73 is electrically connected to an auxiliary remote signal output line 75 .

[0038] Specifically, a remote signal output terminal 11 is connected to the outer side of the surge protector housing 1 .

[0039] The working principle of the utility model is: when in use, in the manual operation working state, the tripping mechanism 2 can drive the moving contact 3 and the static contact 4 to contact or separate by opening and closing the operating handle 8. In addition, the electromagnetic release 6 can also be driven by the short-circuit current to drive the tripping mechanism 2 to drive the moving contact 3 and the static contact 4 to achieve overcurrent protection separation action. In addition, no matter the lightning current or the power frequency current passes through the above-mentioned overvoltage sensitive resistor 71, the overvoltage is further limited. If the varistor reaches thermal collapse, the compression spring 77 makes the low-temperature welding point 72 melt open, and the overheating separation mechanism 73, under the action of the compression spring 77, makes the indicating mechanism 74 exceed the end face of the plastic shell, and an alarm is issued.

[0040] The utility model adds a backup protection structure, which reduces the original equipment space, saves product costs, is conducive to the coordination of product parameter characteristics, and is more conducive to product miniaturization, and has double safety and portability.

[0041] The standard parts used in the utility model can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A surge protector with a backup protection function, comprising a surge protector housing (1), a tripping mechanism (2), a discharge gap (5), an electromagnetic tripping device (6), a varistor module (7), an upper wiring terminal (9), a remote signal output terminal (11), and a lower wiring terminal (12), wherein the surge protector housing (1) is movably connected to the outside of the surge protector, and characterized in that: The tripping mechanism (2) is arranged at the upper end of the surge protector housing (1); one end of the tripping mechanism (2) is connected to an electromagnetic tripping device (6), and the other end of the tripping mechanism (2) is brake-connected to a handle (8) installed outside the surge protector housing (1); two ends of the tripping mechanism (2) are respectively connected to a moving contact (3) and a stationary contact (4); the electromagnetic tripping device (6) controls the contact or separation of the moving contact (3) and the stationary contact (4) through the tripping mechanism (2); the varistor module (7) is arranged at the lower end of the surge protector housing (1) through a mounting card (10); the upper wiring terminal (9) and the lower wiring terminal (12) are respectively connected to the left and right ends of the surge protector housing (1).

2. A surge protector with backup protection function according to claim 1, characterized in that: The tripping mechanism (2) comprises a tripping wheel (202), a connecting piece (203), a contact seat (204), a lock (205), and a lever wheel (206); the top end of the contact seat (204) is connected to the lever wheel (206); the lever wheel (206) is movably connected to the lock (205); the lever wheel (206) is connected to the tripping wheel (202) via the connecting piece (203); and a handle connecting rod (201) is rotatably connected to the tripping wheel (202).

3. A surge protector with backup protection function according to claim 2, characterized in that: The handle connecting rod (201) is adapted to be connected to the handle (8).

4. The surge protector with backup protection function according to claim 1, characterized in that: The discharge gap (5) is a gas discharge tube with inert gas or an air gap formed by metal electrodes.

5. The surge protector with backup protection function according to claim 1, characterized in that: The electromagnetic release (6), the moving iron core (61), the electromagnetic coil (62), the coil frame (63), the return spring (64) and the static iron core (65), the left and right ends of the coil frame (63) are respectively connected to the electromagnetic coil (62), one end of the coil frame (63) is connected to the electromagnetic release (6), and the other end of the coil frame (63) is connected to the static iron core (65) via the return spring (64).

6. A surge protector with backup protection function according to claim 5, characterized in that: A stripping ejector rod (66) is plugged and connected to the static iron core (65).

7. The surge protector with backup protection function according to claim 5, characterized in that: The induced voltage generated by the power frequency current at both ends of the electromagnetic coil (62) is smaller than the breakdown voltage of the discharge gap (5).

8. The surge protector with backup protection function according to claim 1, characterized in that: The varistor module (7) comprises a varistor element (71), a low-temperature welding point (72), an overheating release mechanism (73), an indicating mechanism (74) and a compression spring (77); the varistor element (71) is provided with a boss electrode (76); the low-temperature welding point (72) is welded to the boss electrode (76); the overheating release mechanism (73) is arranged on one side inside the varistor element (71); and the indicating mechanism (74) is elastically arranged on the other side inside the varistor element (71) via the compression spring (77).

9. A surge protector with backup protection function according to claim 8, characterized in that: One side of the overheating release mechanism (73) is electrically connected to an auxiliary remote signal output line (75).

10. The surge protector with backup protection function according to claim 1, characterized in that: The outer side of the surge protector housing (1) is connected to a remote signal output terminal (11).

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