CN211127129U

CN211127129U - Surge protector

Info

Publication number: CN211127129U
Application number: CN201922486284.0U
Authority: CN
Inventors: 鲍舒耕; 任怡; 李天密; 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: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-07-28
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a surge protector, overvoltage protection subassembly and tripping device are on the box body and by including the shell encapsulation of cover on the box body, the overvoltage protection subassembly includes voltage limiting type component and voltage switch type component, voltage limiting type component leans on and has set up the insulating layer of separating usefulness between the two with voltage switch type component mutually, voltage limiting type component, voltage switch type component is connected through the pin electricity that leans on the side direction of direction in both mutually, the overvoltage protection subassembly is provided with first pin, second pin and third pin, first pin, second pin are connected through first working electrode, second working electrode on tripping device and the box body respectively, the third pin regard as the earthing pole. Surge protector can be reliable provide overvoltage protection, simple structure, compactness, occupation space is little, satisfies miniaturized demand, has good inside electrical insulation intensity, uses the reliability high, the security is good.

Description

Surge protector

Technical Field

The utility model relates to an electric protection device technical field especially relates to a surge protector.

Background

A surge protector is an electronic device for providing safety protection for various electronic equipment, instruments and meters and communication lines. When the peak current or voltage is suddenly generated in an electric loop or a communication line due to external interference, the surge protector can conduct and shunt in a very short time, so that the damage of the surge to other equipment in the loop is avoided. 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. With the development of miniaturization and low cost of power supply equipment, the requirements for the surge protection devices are higher and higher, for example, the surge protection devices do not have independent installation spaces but are directly installed on a power supply board of the power supply equipment, which causes the working environment temperature of the surge protection devices to be consistent with the internal temperature of the power supply equipment, and basically reach more than 90 ℃, and because the surge protection devices are directly installed on the power supply board, and the occupied area of the surge protection devices is not large after the power supply equipment is miniaturized, under the condition that the through-current capacity of the surge protection devices is not required to be changed, the volume of the surge protection devices needs to be further reduced to adapt to the small occupied area, which enlarges the insulation problem inside the surge protection devices, the existing surge protection devices are generally connected by welding in a mode of keeping a certain distance between elements in order to ensure the electrical insulation strength between the elements inside the surge protection devices, therefore, the surge protector is not compact in structure and large in occupied space, is difficult to meet the requirement of miniaturization development, and is not suitable for lightning stroke in a high-temperature environment.

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 not compact, bulky, is not suitable for the problem of the miniaturized development of power equipment.

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 are on the box body and by the shell encapsulation of cup joint on the box body inside, the overvoltage protection subassembly include voltage limiting type component and voltage switch type component, voltage limiting type component leans on and set up the insulating layer of separating usefulness between the two with voltage switch type component mutually, voltage limiting type component, voltage switch type component are connected through the pin electricity that sets up on both sides of leaning on the direction mutually, the overvoltage protection subassembly 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 as the earthing pole. Surge protector simple structure, compactness, occupation space is little, satisfy miniaturized demand, get rid of the clearance of reserving between voltage limiting type component and the voltage switch type component, utilize the insulating layer to guarantee the electric dielectric strength between the surge protector internal element simultaneously, make surge protector can satisfy the lightning protection performance requirement under the high temperature environment, thereby it is effectual to meet the electrical isolation when overload current passes through, the high temperature that can avoid overload current to produce leads to surge protector because of surge protector miniaturized back internal dielectric strength is not enough, the through-flow capacity is not enough damages, reduce the cost of maintaining the change.

Furthermore, the voltage limiting element comprises two voltage dependent resistors, the voltage switch element group comprises a plurality of connected gas discharge tubes, one electrodes of the two voltage dependent resistors are connected with the third pin through the voltage switch element, and the other electrodes of the two voltage dependent resistors respectively form the first pin and the second pin.

Further, the box body is provided with a cavity groove for placing a voltage limiting element, the wall surface of the cavity groove is provided with a guide clamping groove extending from the opening part of the cavity groove to the bottom of the cavity groove, an electrode card of the piezoresistor connected with the voltage switch element is clamped into the guide clamping groove and penetrates out of the cavity groove, the voltage switch element leans against the opening part of the cavity groove and is welded with the electrode of the piezoresistor, the piezoresistor is placed into the cavity groove along the guide clamping groove, the guide clamping groove plays a role in positioning the piezoresistor, the accurate stability of the assembly position of the piezoresistor is ensured, the voltage switch element is welded with the electrode of the piezoresistor to realize fixation, the structure is compact, and the installation is convenient.

Furthermore, a pin of the voltage switch type element, which is connected with the piezoresistor, is attached to the outer wall of the cavity groove, and the pin is provided with a limiting clamping groove for clamping an electrode of the piezoresistor, so that the structure compactness is improved, and the accuracy and the stability of the assembly position of the voltage switch type element are ensured by utilizing the limiting clamping groove.

Furthermore, the wall surface of the cavity groove is provided with through holes used for exposing the first pin and the second pin, one end of the tripping mechanism, which is separated from the elastic sheet, is respectively welded with the first pin and the second pin through low-temperature solder to form a separation welding spot, and the other end of the tripping mechanism, which is separated from the 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, the first pin and the second pin are effectively separated, the spacing distance is enlarged, the purposes of electrical isolation and arc extinction are achieved, the electrical isolation effect is improved, equipment is effectively protected, and the use safety is improved.

Furthermore, the shell is provided with an indication window, and the arc shielding sliding block is provided with an indication block matched with the indication window. After the shell fragment and first pin, second pin take place to trip out, thereby the position of arc-shielding slider then can take place to remove and change the content that the instruction window shows to can clearly audio-visually indicate out surge protector's state, be convenient for the on-the-spot observation its state and in time maintain the change.

Further, the shell include shell main part and cap, shell main part have open-top's cavity, in the cavity was put into from open-top to the box body that has loaded overvoltage protection subassembly and tripping device, the open-top of cap lock closed cavity, the through-hole that supplies first working electrode, second working electrode and earthing pole to wear out was seted up to shell main part's bottom side, surge protector is connected with external circuit through first working electrode, second working electrode and earthing pole, shell main part's bottom side only has the very little through-hole of bore and cavity intercommunication to can improve the electrical insulation nature between each component in the shell and the external circuit, improve surge protector's use reliability and security.

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, has good inside electrical insulation intensity, uses the reliability high, the security is good.

Drawings

Fig. 1 is an overall external structural view of a surge protector;

fig. 2 is a schematic view of an assembly structure of the overvoltage protection component, the tripping mechanism and the box body;

FIG. 3 is a schematic view of the other side of FIG. 2;

FIG. 4 is a schematic diagram of an assembled cross-sectional structure of the overvoltage protection device and the case;

fig. 5 is a schematic structural diagram of the cartridge.

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 effectively reduce the volume, satisfy the demand of miniaturized development to have good inside electrical insulation intensity, the stability in use is good.

As shown in fig. 1 to 4, a surge protector mainly includes a housing 1, a box 2, an overvoltage protection component and a tripping mechanism 3, wherein the overvoltage protection component and the tripping mechanism 3 are mounted on the box 2, and the housing 1 covers the box 2 to enclose the overvoltage protection component and the tripping mechanism 3 inside;

the overvoltage protection component mainly comprises a voltage limiting component and a voltage switch component, in this embodiment, the voltage limiting component comprises two piezoresistors 4, the voltage switch component group comprises a plurality of gas discharge tubes 5 connected together, one electrode of each piezoresistor 4 is connected with a third pin 51 through the voltage switch component, the other electrode of each piezoresistor 4 forms a first pin 41 and a second pin 42, the first pin 41 and the second pin 42 are connected with a first working electrode 21 and a second working electrode 22 arranged on the box body 2 through a tripping mechanism 3, the third pin 51 is used as a grounding electrode 23, and the first working electrode 21, the second working electrode 22 and the grounding electrode 23 penetrate out of the shell 1 and are used for being connected with an external circuit;

the box body 2 is provided with a cavity groove 24 for placing the piezoresistor 4, the wall surface of the cavity groove 24 is provided with a guide clamping groove 25 extending from the opening part of the cavity groove to the bottom of the cavity groove, the electrode of the piezoresistor 4 connected with the voltage switch type element is clamped into the guide clamping groove 25 and penetrates out of the cavity groove 24, the outer surfaces of the two piezoresistors 4 are respectively coated with an insulating layer 6, the insulating layer 6 can be specifically made of insulating paper, so that the two piezoresistors 4 are electrically insulated and isolated by the insulating layer 6, the voltage switch type element leans against the opening part of the cavity groove 24 and leans against the piezoresistor 4, so that the voltage switch type element and the piezoresistor 4 are also electrically insulated and isolated by the insulating layer 6, the voltage switch type element is welded and connected with the electrode of the piezoresistor 4, namely, the pins connected with the voltage switch type element and the piezoresistor 4 are arranged on the side direction in which the voltage switch type element and the piezoresistor 4, the surge protection device has the advantages that the structure compactness is improved, the size of the surge protection device is reduced, the surge protection device is guaranteed to have good internal electrical insulation strength, the influence of elements is avoided, the damage of a plurality of elements is effectively avoided when the surge protection device meets extra-large overload current, the maintenance and replacement cost is reduced, concretely, the guide clamping grooves 25 are respectively formed in the wall surfaces of two opposite sides of the cavity groove 24, so that the electrodes of the two piezoresistors 4 connected with the voltage switch type elements are located on the two opposite sides of the cavity groove 24, the pins of the voltage switch type elements connected with the piezoresistors 4 are attached to the outer wall of the cavity groove 24, the limit clamping grooves 52 for the electrode cards of the piezoresistors 4 to be clamped are formed in the pins, the connection reliability of the voltage switch type elements and the piezoresistors 4 is guaranteed, and the accuracy and the stability of the assembly.

The tripping mechanism 3 is positioned on the outer wall of the cavity 24, the tripping mechanism 3 comprises a disengaging spring 31, an arc shielding sliding block 32 and a spring, through holes 26 for exposing a first pin 41 and a second pin 42 are respectively formed on two pairs of side wall surfaces of the cavity 24, one end of the disengaging spring 31 of the tripping mechanism 3 is respectively welded with the first pin 41 and the second pin 42 through low-temperature solder to form a disengaging welding point, the other end of the disengaging spring 31 is respectively connected with the first working electrode 21 and the second working electrode 22, the arc shielding sliding block 32 is pushed by the spring to abut against the disengaging welding point, the arc shielding sliding block 32 moves to the position between the disengaging spring 31 and the first pin 41 and the second pin 42 under the pushing of the spring to carry out electrical isolation after the disengaging welding point is separated, and when the solder between the disengaging spring and the first pin 31 and the second pin 32 is melted due to overlarge current or failure, the disengaging spring 31 is separated from the first pin 41 and the second pin 42 under the action of the self elasticity, and the arc-shielding sliding block 32 further pushes the separation spring sheet 31 to increase the distance between the separation spring sheet 31 and the first pin 41 and the second pin 42 under the action of the spring, so that the purposes of electrical isolation and arc extinction are achieved.

The shell 1 is provided with an indication window 13, the arc shielding sliding block 32 is provided with an indication block 33 matched with the indication window 13, and after the separation spring plate is disengaged from the first pin and the second pin, the position of the arc shielding sliding block 32 relative to the indication window 13 is changed, so that the indication window 13 displays different state prompt contents; in this embodiment, the housing 1 includes a housing main body 11 and a housing cover 12, the housing main body 11 has a cavity with an open top, the case 2 loaded with the overvoltage protection component and the trip mechanism is placed into the cavity from the open top, the housing cover 12 is fastened to close the open top of the cavity, and the bottom side of the housing main body 11 is provided with a through hole for the first working electrode 21, the second working electrode 22 and the ground electrode 23 to penetrate through, so as to improve the electrical insulation between each component in the housing and an external circuit.

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 (3), wherein the overvoltage protection assembly and the tripping mechanism (3) are arranged on the box body (2) and encapsulated inside the box body (2) by the shell (1) covered on the box body, the overvoltage protection assembly comprises a voltage limiting element and a voltage switch element, the voltage limiting element and the voltage switch element are mutually leaned against and an insulating layer (6) for separation is arranged between the voltage limiting element and the voltage switch element, the voltage limiting element and the voltage switch element are electrically connected through pins arranged on the lateral direction of the leaning direction of the voltage limiting element and the voltage switch element, the overvoltage protection assembly is provided with a first pin (41), a second pin (42) and a third pin (51), and the first pin (41) and the second pin (42) are respectively connected with a first working electrode (21) arranged on the box body (2) through the tripping mechanism (3), The second working electrode (22) is connected, and the third pin (51) is used as a grounding electrode (23).

2. A surge arrester as claimed in claim 1, wherein the voltage limiting element comprises two voltage dependent resistors (4), the voltage switching element group comprises a plurality of connected gas discharge tubes (5), one electrode of each of the two voltage dependent resistors (4) is connected to the third pin (51) via the voltage switching element, and the other electrode of each of the two voltage dependent resistors (4) forms the first pin (41) and the second pin (42), respectively.

3. A surge protector according to claim 2, wherein the housing (2) is provided with a cavity (24) for accommodating the voltage limiting element, the wall of the cavity (24) is provided with a guide slot (25) extending from the mouth of the cavity to the bottom of the cavity, the electrode of the varistor (4) connected to the voltage switching element is clamped into the guide slot (25) and penetrates out of the cavity (24), and the voltage switching element abuts against the mouth of the cavity (24) and is welded to the electrode of the varistor (4).

4. A surge arrester as claimed in claim 3, wherein the voltage switching element has a pin connected to the varistor (4) and abutting against an outer wall of the cavity (24), and the pin defines a retaining notch (52) for the varistor (4) to engage.

5. A surge protector according to claim 3, wherein the wall of the cavity (24) is provided with a through opening (26) for exposing the first pin (41) and the second pin (42), one end of the release spring (31) of the release mechanism (3) is welded to the first pin (41) and the second pin (42) respectively by low temperature solder to form a release solder joint, and the other end of the release spring (31) is connected to the first working electrode (21) and the second working electrode (22) respectively.

6. A surge arrester as claimed in claim 5, wherein the trip mechanism (3) further comprises an arc shielding slider (32) and a spring, the arc shielding slider (32) is urged by the spring to abut against the separation pad, and after the separation pad is separated, the arc shielding slider (32) is urged by the spring to move to the separation spring (31) to electrically isolate the first pin (41) from the second pin (42).

7. A surge protector according to claim 6, wherein the housing (1) is provided with an indication window (13), and the arc-shielding slider (32) is provided with an indication block (33) engaged with the indication window (13).

8. A surge protector according to any one of claims 1 to 6, wherein the housing (1) comprises a housing main body (11) and a housing cover (12), the housing main body (11) has a top-opening chamber, the case (2) loaded with the overvoltage protection device and the trip mechanism is placed into the chamber from the top-opening, the housing cover (12) is fastened to close the top-opening of the chamber, and the bottom side of the housing main body (11) is provided with through holes for the first working electrode (21), the second working electrode (22) and the grounding electrode (23) to pass through.