CN210380248U

CN210380248U - Surge protector

Info

Publication number: CN210380248U
Application number: CN201921676980.1U
Authority: CN
Inventors: 鲍舒耕; 李天密; 任怡; 吉思雨; 杨国华
Original assignee: Sichuan Zhongguang Lightning Protection Technologies Co ltd
Current assignee: Sichuan Zhongguang Lightning Protection Technologies Co ltd
Priority date: 2019-10-09
Filing date: 2019-10-09
Publication date: 2020-04-21
Anticipated expiration: 2029-10-09

Abstract

The utility model discloses a surge protector, including shell, box body, overvoltage protection subassembly and tripping device, the overvoltage protection subassembly includes voltage limiting type component group and the voltage switch type component group of being connected with it electricity, voltage limiting type component group and voltage switch type component group put into respectively on the box body the isolated different chamber grooves of opening that set up in, overvoltage protection subassembly still be provided with first pin, second pin and third pin, first pin, second pin are connected with first working electrode, the second working electrode of setting on the box body through tripping device respectively, the third pin wear out the box body and regard as the earthing pole. The utility model discloses compact structure, occupation space are little, also have good internal insulation strength under high temperature environment, can fill the lightning protection performance requirement under the high temperature environment, meet the electrical isolation effectual that overload current passed through under the high temperature environment.

Description

Surge protector

Technical Field

The utility model relates to an electrical equipment technical field especially relates to a surge protector.

Background

The surge protector is an essential device for suppressing a peak current or an overvoltage generated by lightning, an operation of an electric system, static electricity, or the like, and protecting an electronic information technology product. Under normal conditions, the surge protector is in a high-impedance state, and the leakage current is almost zero, so that the normal power supply of the power supply system is ensured. When the power supply system generates surge, the surge protector is immediately conducted within nanosecond time, the amplitude limit value of the overvoltage is within the safe working range of the equipment, and meanwhile, the surge energy is released to the ground. The surge protector then quickly changes to a high impedance state so that the normal power supply is not affected. The space of traditional surge protector installation is great, but along with power equipment's miniaturization and low cost ization, surge protector needs direct mount on the power strip in power equipment, it is higher that the miniaturization makes the heat dissipation condition limit lead to inside temperature, make surge protector's operational environment temperature higher, current surge protector structure is complicated unreasonable, be difficult to satisfy the job stabilization nature under the high ambient temperature condition, the inside electric insulation intensity of surge protector is difficult to satisfy the electric safety requirement, overvoltage protection subassembly among the surge protector comprises a plurality of component usually, a plurality of component of overvoltage protection subassembly assemble in a space usually, the easy mutual influence of component work heating, the job stabilization nature has been reduced, it is with high costs to maintain the change.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve and the technical task that provides improve prior art, provide a surge protector, the surge protector structure of solving among the prior art is complicated unreasonable, and it is bulky to occupy, is difficult to satisfy the job stabilization nature under the high ambient temperature condition, maintains the problem that the replacement cost is high.

For solving the above technical problem, the technical scheme of the utility model is that:

the utility model provides a surge protector, includes shell, box body, overvoltage protection subassembly and tripping device on the box body and by the shell closure on the box body in inside, the overvoltage protection subassembly includes voltage limiting type component group and the voltage switch type component group of being connected with it electricity, voltage limiting type component group and voltage switch type component group put into respectively on the box body the isolated different chamber grooves of opening that set up in, the overvoltage protection subassembly still be provided with first pin, second pin and third pin, first pin, second pin are connected through tripping device and first working electrode, the second working electrode of setting on the box body respectively, the third pin wear out the box body as the earthing pole. Surge protector simple structure, compactness, occupation space is little, satisfy miniaturized demand, and voltage limitation type component group and voltage switch type component group are effectively isolated, accomplish each device and all exist in solitary cavity under the condition that does not increase the volume, with the insulation of each inside component of enhancement module, make surge protector can be full of lightning protection performance requirement under the high temperature environment, thereby it is effectual to meet the electrical isolation when overload current passes through under high temperature environment, the high temperature that can avoid overload current to produce leads to surge protector because of surge protector internal insulation intensity is not enough, the not enough damage of discharge capacity after the miniaturization, reduce the cost of maintaining the change.

Therefore, when the overvoltage protection component meets extra-large overload current, the electrical isolation effect and the heat insulation effect are good, damage to multiple elements of the overvoltage protection component caused by high temperature generated by the overload current can be avoided, and the maintenance and replacement cost is reduced.

Furthermore, the voltage limiting type element group comprises two piezoresistors, the voltage switch type element group comprises a plurality of gas discharge tubes connected in parallel, one ends of the two piezoresistors are connected with one parallel end of each gas discharge tube, the other ends of the two piezoresistors are respectively a first pin and a second pin, and the other parallel end of each gas discharge tube is a third pin.

Further, the box body on be used for placing the cavity inslot of voltage limiting type component group and set up the baffle that is used for separating piezo-resistor, improve electrical isolation effect and thermal-insulated effect, avoid one of them piezo-resistor to damage or strike by lightning to lead to one of them piezo-resistor to be in and spread to another piezo-resistor when high generating heat, avoid damaging the expansion, can effectively stop the loss, reduce the cost of maintaining the change.

Furthermore, the wall surface of the cavity groove is provided with a guide clamping groove which extends from the opening part of the cavity groove to the inside of the cavity groove and is used for clamping the first pin, the second pin and the third pin into and out of the cavity groove, the installation and the maintenance are convenient, the tripping mechanism is positioned outside the cavity groove used for placing the voltage limiting element group and the voltage switch element, only the first pin and the second pin penetrate out of the cavity groove and then are connected with the tripping mechanism, and therefore after the tripping mechanism is tripped due to the fact that extra-large overload current flows, the cavity groove effectively plays a role in enabling the overvoltage protection assembly, the first working electrode and the second working electrode to achieve electrical isolation, the fact that insulation between the piezoresistor and the working electrode is weakened and broken down under a high-temperature environment to cause failure of the tripping device is avoided, and the use safety is improved.

Furthermore, the tripping mechanisms are symmetrically arranged on two sides of the box body, and the box body is compact in structure, small in occupied space and convenient to assemble and disassemble.

Furthermore, the tripping mechanism comprises a separation elastic sheet, one end of the separation elastic sheet is respectively connected with the first pin and the second pin in a welding mode through low-temperature welding flux to form a separation welding spot, and the other end of the separation elastic sheet is respectively connected with the first working electrode and the second working electrode. When an extra-large overload current flows, the solder between the separation elastic sheet and the first pin and the solder between the separation elastic sheet and the second pin are released due to high-temperature melting, the separation elastic sheet is separated from the first pin and the second pin under the action of the elastic force of the separation elastic sheet to form open circuit, and the electrical isolation effect is reliably achieved.

Furthermore, tripping device still include arc-shielding slider and spring, arc-shielding slider push by the spring and lean on breaking away from the solder joint to arc-shielding slider moves to breaking away from under the spring promotion and carries out electrical isolation between shell fragment and first pin, the second pin after breaking away from the solder joint and separating. When the current is too large or the solder between the separation elastic sheet and the first pin and the solder between the separation elastic sheet and the second pin are melted due to faults, the arc shielding sliding block moves to the position between the separation elastic sheet and the first pin and between the separation elastic sheet and the second pin under the action of the spring, so that the separation elastic sheet is effectively separated from the first pin and the second pin, the spacing distance is enlarged, the purposes of electrical isolation and arc extinction are achieved, equipment is effectively protected, and the use safety is improved.

Compared with the prior art, the utility model discloses the advantage lies in:

surge protector can be reliable provide overvoltage protection, simple structure, compactness, occupation space is little, satisfies miniaturized demand, also has good inside dielectric strength under high temperature environment, can meet lightning protection performance requirement under the high temperature environment, it is effectual to meet the electrical isolation that overload current passed through under the high temperature environment, the high temperature that can avoid overload current to produce leads to a plurality of components of overvoltage protection subassembly impaired, reduce the cost of maintaining the change.

Drawings

Fig. 1 is a schematic exterior view of a surge protector;

fig. 2 is a schematic structural diagram of a surge protector cartridge;

fig. 3 is a schematic cross-sectional view of a surge protector cartridge;

FIG. 4 is a schematic circuit diagram of an overvoltage protection device;

fig. 5 is a schematic circuit diagram of a second embodiment of the overvoltage protection device;

fig. 6 is a schematic circuit diagram of a third embodiment of the overvoltage protection device.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The embodiment of the utility model discloses a surge protector, simple structure, compactness, occupation space is little, and the component of overvoltage protection subassembly is effectively separated, improves the operational reliability under the high temperature environment, and lightning protection performance requirement under the full high temperature environment reduces and maintains the replacement cost.

Example one

As shown in fig. 1 to 4, a surge protector mainly includes a housing 1, a box body 2, an overvoltage protection component and a tripping mechanism 5, wherein the overvoltage protection component and the tripping mechanism 5 are mounted on the box body 2, and the housing 1 covers the box body 2 to seal the overvoltage protection component and the tripping mechanism 5 inside;

the overvoltage protection component mainly comprises a voltage-limiting component group and a voltage-switching component group, in the embodiment, the voltage-limiting component group comprises two piezoresistors 3, the voltage-switching component group comprises two gas discharge tubes 4 connected in parallel, one end of each piezoresistor 3 is connected with one parallel end of each gas discharge tube 4, the other ends of each piezoresistor are respectively a first pin 31 and a second pin 32, the other parallel end of each gas discharge tube 4 is a third pin 41, and the voltage-limiting component group and the voltage-switching component group are respectively arranged in different isolated cavities 21 arranged on the box body 2, so that the electrical isolation effect is improved, the mutual influence of the components is avoided, a plurality of components are effectively prevented from being damaged when an extra-large overload current is encountered, the maintenance and replacement cost is reduced, and particularly, the cavity 21 for arranging the gas discharge tubes 4 is arranged at the bottom side of the cavity 21 for arranging the piezoresistors 3, the opening direction of the cavity groove 21 for placing the gas discharge tube 4 is vertical to the cavity groove 21 for placing the piezoresistor 3, and the pin of the piezoresistor passes through the cavity groove 21 and then is connected with the gas discharge tube 4; the wall surfaces of the cavity groove 21 for placing the gas discharge tube 4 and the cavity groove 21 for placing the piezoresistor 3 are provided with a guide clamping groove 22 which extends from the mouth part of the cavity groove 21 to the inside of the cavity groove 21, when the gas discharge tube 4 and the piezoresistor 3 are put into the cavity groove 21, the first pin 31, the second pin 32 and the third pin 41 are clamped into the guide clamping groove 22 and slide along the guide clamping groove 22 until the gas discharge tube 4 and the piezoresistor 3 are installed in place, the guide clamping groove 22 plays a role in positioning the placing positions of the gas discharge tube 4 and the piezoresistor 3, the installation accuracy is guaranteed, the gas discharge tube 4 and the piezoresistor 3 are fixed in the cavity groove 21 in a limiting way, and the displacement of the gas discharge tube 4 and the piezoresistor 3 is avoided, the first pin 31, the second pin 32 and the third pin 41 penetrate out of the cavity groove 21 from the guide clamping groove 22 to be electrically connected, so that the electrical isolation effect after tripping is guaranteed;

the first pin 31 and the second pin 32 are respectively connected with the first working electrode 23 and the second working electrode 24 arranged on the box body 2 through the tripping mechanism 5, and the third pin 41 penetrates out of the box body 2 to be used as the grounding electrode 25.

In order to further reduce the mutual influence among the elements, a partition 26 for separating the piezoresistors 3 is arranged in the cavity groove 21 for placing the voltage-limiting type element group, so that the two piezoresistors 3 are further separated; in order to improve the electrical isolation effect, the first pins 31 and the second pins 32 need to ensure sufficient distance, so that the first pins 31 and the second pins 32 penetrate out from two opposite sides of the cavity groove 21 for placing the voltage-limiting element group, that is, the guide clamping grooves 22 are arranged on two opposite side wall surfaces of the cavity groove 21 for placing the voltage-limiting element group, the tripping mechanisms 5 are arranged on two opposite sides of the cavity groove 21 for placing the voltage-limiting element group, and the tripping mechanisms 5 are symmetrically arranged on two sides of the box body 2 in the overall structure.

In this embodiment, the trip mechanism 5 mainly includes a separation spring 51, one end of the separation spring 51 is welded to the first pin 31 and the second pin 32 through low-temperature solder to form a separation welding point, and the other end of the separation spring 51 is connected to the first working electrode 23 and the second working electrode 24; the tripping mechanism 5 further comprises an arc shielding slider 52 and a spring, the spring acts between the arc shielding slider 52 and the box body, a spring cylinder for placing the spring is arranged on the arc shielding slider 52, the arc shielding slider 52 is pushed by the spring to abut against a separation welding point, the arc shielding slider 52 moves to the separation elastic sheet 51 under the pushing of the spring to be electrically isolated from the first pin 31 and the second pin 32 after the separation welding point is separated, when the solder between the separation elastic sheet and the first pin 31 and the second pin 32 is melted due to overlarge current or failure, the separation elastic sheet 51 is separated from the first pin 31 and the second pin 32 under the action of the self elastic force, and the arc shielding slider 52 further pushes the separation elastic sheet 51 under the action of the spring to increase the spacing distance between the separation elastic sheet 51 and the first pin 31 and the second pin 32, so as to achieve the purposes of electrical isolation and arc extinction and effectively protect the equipment, the use safety is improved.

Example two

As shown in fig. 5, the difference from the first embodiment is that the voltage switch element group includes three gas discharge tubes 4 connected in parallel, the voltage limiting element group still includes two voltage dependent resistors 3, one end of each of the two voltage dependent resistors 3 is connected to one parallel end of each of the three gas discharge tubes 4, the other ends of the two voltage dependent resistors are respectively the first pin 31 and the second pin 32, the other parallel end of each of the three gas discharge tubes 4 is the third pin 41, and the voltage limiting element group and the voltage switch element group are respectively placed in the isolated different cavities 21 provided in the case 2, so that even if one of the gas discharge tubes 4 fails, the other gas discharge tubes 4 still can ensure the normal operation of the surge protector, and stably play a role of overvoltage protection.

EXAMPLE III

As shown in fig. 6, the difference from the first embodiment is that the voltage switch type element group includes two gas discharge tubes 4, the voltage limiting type element group still includes two piezoresistors 3, one end of each of the two gas discharge tubes 4 is collinear to form a third pin 41, the other ends of the two gas discharge tubes 4 are respectively connected to one piezoresistor 3, and the other ends of the two piezoresistors are respectively a first pin 31 and a second pin 32, i.e. a structure in which one piezoresistor 3 is connected in series with one gas discharge tube 4 is formed.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.

Claims

1. The surge protector is characterized by comprising a shell (1), a box body (2), an overvoltage protection assembly and a tripping mechanism (5), wherein the overvoltage protection assembly and the tripping mechanism (5) are arranged on the box body (2) and are sealed inside the box body (2) by the shell (1) covered on the box body, the overvoltage protection assembly comprises a voltage limiting element group and a voltage switch element group electrically connected with the voltage limiting element group, the voltage limiting element group and the voltage switch element group are respectively arranged in isolated different cavity grooves (21) formed in the box body (2), the overvoltage protection assembly is further provided with a first pin (31), a second pin (32) and a third pin (41), and the first pin (31) and the second pin (32) are respectively connected with a first working electrode (23) arranged on the box body (2) through the tripping mechanism (5), The second working electrode (24) is connected, and the third pin (41) penetrates out of the box body (2) to serve as a grounding electrode (25).

2. A surge protector according to claim 1, wherein the voltage-limiting element group comprises two voltage dependent resistors (3), the voltage-switching element group comprises a plurality of gas discharge tubes (4) connected in parallel, one end of each of the two voltage dependent resistors (3) is connected to one parallel end of each of the gas discharge tubes (4), the other ends of the two voltage dependent resistors (3) are respectively a first pin (31) and a second pin (32), and the other parallel end of each of the gas discharge tubes (4) is a third pin (41).

3. A surge arrester as claimed in claim 2, wherein the housing (2) has cavities for receiving groups of voltage limiting elements, and spacers (26) are provided to separate the piezoresistors.

4. A surge protector according to claim 2, wherein the wall surface of the cavity has guide slots (22) formed therein, the guide slots extending from the mouth of the cavity to the interior of the cavity for the first pin (31), the second pin (32) and the third pin (41) to engage in and pass out of the cavity.

5. A surge protector according to any of claims 1 to 4, wherein the trip mechanism (5) is symmetrically arranged on both sides of the housing (2).

6. A surge protector according to claim 5, wherein the trip mechanism (5) comprises a separation spring (51), one end of the separation spring (51) is connected with the first pin (31) and the second pin (32) by low temperature solder to form a separation welding point, and the other end of the separation spring (51) is connected with the first working electrode (23) and the second working electrode (24) respectively.

7. A surge arrester as claimed in claim 6, wherein the trip mechanism (5) further comprises an arc shielding slider (52) and a spring, the arc shielding slider (52) is urged by the spring to abut against the separation pad, and after the separation pad is separated, the arc shielding slider (52) is urged by the spring to move to electrically isolate the separation spring (51) from the first and second pins (31, 32).