CN212137278U - Surge protector - Google Patents

Abstract

The utility model provides a surge protector, which comprises a shell, a micro switch, a support frame, a piezoresistor, a discharge tube, a connecting sheet, a PCB (printed circuit board), a spring and a sliding piece; the piezoresistor, the connecting sheet and the discharge tube are sequentially in conductive connection; the piezoresistor and the connecting sheet are welded through low-temperature welding tin; the micro switch, the piezoresistor and the discharge tube are all in conductive connection with the PCB; the piezoresistor and the sliding piece are arranged on the supporting frame; the spring can enable the sliding part to abut against the connecting sheet, and the sliding part abuts against the microswitch under the elastic force of the spring; when the low-temperature soldering tin is melted, the spring can drive the sliding piece to be separated from the microswitch. The utility model provides a surge protector, great voltage appears in the circuit, and the piezo-resistor temperature risees, makes low temperature soldering tin melt, and piezo-resistor breaks off with the connection piece under the drive of slider and spring for micro-gap switch realizes the conversion, feeds back the information feedback that surge protector became invalid to backstage control, has improved surge protector's fail safe sensitivity.

Description

Surge protector

Technical Field

The utility model belongs to the technical field of the overvoltage protection, more specifically say, relate to a surge protector.

Background

Over-voltage caused by lightning strike induction, capacitive load switching on, inductive load switching off and the like is often encountered in power systems, and the over-voltage can cause damage to electric equipment. Surge protection devices (SPDs, also known as lightning protection devices) are usually connected in parallel with electrical equipment in a circuit, and the voltage sensitivity of the SPDs is used to protect the electrical equipment from various overvoltage damages, especially expensive, precise and uninterruptible electrical equipment, such as communication base station rooms, financial systems, stock transaction systems, high-value electrical equipment and other electrical-related equipment and systems, and the surge protection devices are used to protect the equipment and systems from transient overvoltage caused by lightning or other reasons.

Surge protection device among the prior art, piezo-resistor is connected with the temperature fuse, when the voltage in the circuit is too big, the piezo-resistor temperature risees, until rising to the melting point of temperature fuse, and need last a period of time, the temperature fuse just can break off, and the process of this temperature fuse fusing often needs several seconds, when making surge protection device touch extreme condition, the sensitivity that breaks away from the electric wire netting is lower safely, often because piezo-resistor breaks away from the electric wire netting time length and the short circuit, thereby catch fire, arouse the conflagration even.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a surge protector to the surge protector who exists among the solution prior art breaks away from the technical problem that the sensitivity of electric wire netting is low safely.

In order to achieve the above object, the utility model adopts the following technical scheme: the surge protector comprises a shell, a microswitch, a support frame, a piezoresistor, a discharge tube, a connecting sheet, a PCB (printed circuit board), a spring and a sliding piece;

the PCB is arranged in the shell;

the piezoresistor, the connecting sheet and the discharge tube are sequentially in conductive connection;

the piezoresistor and the connecting sheet are welded through low-temperature welding tin;

the micro switch, the piezoresistor and the discharge tube are all in conductive connection with the PCB;

the piezoresistor and the sliding piece are arranged on the support frame;

the spring is arranged between the support frame and the sliding part, so that the sliding part is abutted to the connecting sheet, and under the action of the elastic force of the spring, the sliding part is abutted to the microswitch;

when the low-temperature soldering tin is melted, the spring can drive the sliding piece to be separated from the microswitch.

Further, the support frame includes the division board, the piezo-resistor sets up to two, two piezo-resistor locates respectively the both sides of division board.

Furthermore, a guide post is arranged on the support frame, and the spring is sleeved on the guide post.

Furthermore, a sliding hole is formed in the sliding piece, and the guide column penetrates through the sliding hole.

Furthermore, an avoiding position is also arranged on the supporting frame, and the spring is arranged on the avoiding position;

the support frame includes the mounting groove, the guide post set firmly in the cell wall of mounting groove, micro-gap switch locates in the mounting groove.

Furthermore, a flanging is arranged on the support frame, and the pressure sensitive resistor is shielded by the flanging so as to physically isolate the pressure sensitive resistor from the discharge tube, the PCB and the microswitch.

Furthermore, the support frame is provided with a fixed sliding block, the sliding part is provided with a sliding groove, and the sliding groove is slidably arranged on the fixed sliding block.

Furthermore, the shell is provided with an observation hole, the sliding part is provided with a mark area, and the mark area is provided with at least two different colors;

when the low-temperature soldering tin is melted, the spring can push the sliding piece to move so that the color change of the identification area can be observed through the observation hole.

Furthermore, the support frame is fixedly connected with the PCB.

Further, the housing includes an upper case and a lower case that is fitted with the upper case.

The utility model provides a surge protector's beneficial effect lies in: compared with the prior art, the PCB of the surge protector is arranged in the shell so as to protect the PCB through the shell, and the shell can also prevent foreign objects from contacting the PCB to avoid short circuit of the surge protector; the piezoresistor, the connecting sheet and the discharge tube are sequentially in conductive connection, and the microswitch, the piezoresistor and the discharge tube are all in conductive connection with the PCB so as to be convenient for the microswitch, the piezoresistor, the connecting sheet and the discharge tube to be in conductive connection with the PCB, thereby forming a protection circuit; the support frame is used for supporting the piezoresistor and the sliding piece; the spring is arranged between the support frame and the sliding part and can drive the sliding part to abut against the connecting sheet, the sliding part abuts against the micro switch under the elastic force of the spring to keep one state of the micro switch, and the background monitoring information displays that the surge protector is normal; when the circuit is hit by thunder and lightning to generate larger voltage, the piezoresistor and the discharge tube are both conducted, the piezoresistor in the circuit generates heat and accumulates the heat until the low-temperature soldering tin which is used for connecting the piezoresistor and the connecting sheet is melted, and in the process of melting the low-temperature soldering tin, the spring drives the sliding part to abut against the connecting sheet to give a certain external force to the connecting sheet, so that the sliding part can accelerate the disconnection of the connecting sheet and the piezoresistor pin so as to reduce the time from the degradation to the disconnection of the piezoresistor and the connecting sheet, the piezoresistor is safely separated from a power grid after being disconnected from the connecting sheet to avoid fire, meanwhile, because the sliding part is lost, the spring can drive the sliding part to move and separate from the microswitch so as to drive the microswitch to switch state, and transmit the fault information of the surge protector to a user for timely processing, and, it produces heat and the characteristics that melt because of piezo-resistor under the overvoltage condition to assist with low temperature soldering tin, only need low temperature soldering tin tentatively to be close the melting point, under the condition of slider external force, the connection piece just can be with the piezo-resistor disconnection, and pull open electrical safety distance, and the temperature fuse can only break off to a period of time after the temperature reaches the melting point, the time of spending is longer, and can not effectively prevent the electric current arc discharge because temperature fuse disconnection distance is less, the scheme of traditional use temperature fuse is compared to this kind of new scheme, response time is short during the trouble, sensitivity is high, and can not produce the electric current arc discharge, safety and reliability, there is great advantage.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a surge protector provided in an embodiment of the present invention;

fig. 2 is an exploded view of the surge protector device shown in fig. 1;

FIG. 3 is an enlarged view of the stand of FIG. 2;

FIG. 4 is an enlarged view of the slider of FIG. 2;

FIG. 5 is an assembled view of a portion of the structure of FIG. 2;

fig. 6 is an assembly view of a portion of the structure of fig. 2.

Wherein, in the figures, the respective reference numerals:

1. a housing; 11. an upper shell; 111. an observation hole; 12. a lower case; 2. a support frame; 21. a guide post; 22. avoidance positions; 23. flanging; 24. fixing the sliding block; 25. a separator plate; 26. mounting grooves; 3. a microswitch; 4. a voltage dependent resistor; 5. a discharge tube; 6. connecting sheets; 7. a PCB board; 8. a spring; 9. a slider; 91. a slide hole; 92. a chute; 93. the region is identified.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

Referring to fig. 1, fig. 2, fig. 5 and fig. 6, a surge protector according to the present invention will now be described. The surge protector comprises a shell 1, a microswitch 3, a support frame 2, a piezoresistor 4, a discharge tube 5, a connecting piece 6, a PCB 7, a spring 8 and a sliding piece 9;

the PCB 7 is arranged in the shell 1;

the piezoresistor 4, the connecting sheet 6 and the discharge tube 5 are sequentially in conductive connection;

the piezoresistor 4 and the connecting sheet 6 are welded by low-temperature welding tin;

the microswitch 3, the piezoresistor 4 and the discharge tube 5 are all in conductive connection with the PCB 7;

the piezoresistor 4 and the sliding piece 9 are both arranged on the support frame 2;

the spring 8 is arranged between the support frame 2 and the sliding part 9, so that the sliding part 9 is abutted against the connecting sheet 6, and the sliding part 9 is abutted against the microswitch 3 under the action of the elastic force of the spring 8;

when the low-temperature soldering tin melts, the spring 8 can drive the sliding piece 9 to be separated from the microswitch 3.

Compared with the prior art, the surge protector provided by the utility model, the PCB 7 is arranged in the shell 1, so that the PCB 7 is protected by the shell 1, and the shell 1 can also prevent foreign objects from contacting the PCB 7, thereby avoiding short circuit of the surge protector; the piezoresistor 4, the connecting sheet 6 and the discharge tube 5 are sequentially in conductive connection, and the microswitch 3, the piezoresistor 4 and the discharge tube 5 are all in conductive connection with the PCB 7 so as to be convenient for conductively connecting the microswitch 3, the piezoresistor 4, the connecting sheet 6 and the discharge tube 5 on the PCB 7, thereby forming a protection circuit and a remote signaling state conversion circuit; the support frame 2 is used for supporting the piezoresistor 4 and the sliding piece 9; the spring 8 is arranged between the support frame 2 and the sliding piece 9, and can drive the sliding piece 9 to abut against the connecting piece 6, the sliding piece 9 abuts against the micro switch 3 under the elastic force action of the spring 8, at the moment, the micro switch 3 is in a rotating state, and 3 pins form a normally open state and a normally closed state; when the surge protector is hit by lightning exceeding self tolerance or abnormal overvoltage occurs, the piezoresistor 4 and the discharge tube 5 are both conducted, the piezoresistor 4 in the circuit generates heat and accumulates the heat to melt the low-temperature soldering tin for connecting the piezoresistor 4 and the connecting sheet 6, and in the process of melting the low-temperature soldering tin, the spring 8 drives the sliding part 9 to abut against the connecting sheet 6 to give a certain external force to the connecting sheet 6, so that the sliding part 9 can accelerate the disconnection of the connecting sheet 6 and the piezoresistor 4 to reduce the time from the degradation to the disconnection of the piezoresistor 4 and the connecting sheet 6, after the piezoresistor 4 is disconnected from the connecting sheet 6, the spring 8 can drive the sliding part 9 to move and separate from the microswitch 3 due to the loss of constraint of the sliding part 9, the piezoresistor 4 is safely separated from a power grid, meanwhile, the microswitch 3 is in a switching state, and the, the original closed short circuit is converted into an open circuit, the conversion can transmit corresponding fault information to a user so that the user can process the fault information in time, the mechanical motion mode that the spring 8 drives the sliding part 9 is adopted, the time from degradation to disconnection of the connecting sheet 6 and the piezoresistor 4 is shortened, and the sensitivity of the surge protector in safety failure is improved by the novel scheme; when the low-temperature soldering tin is melted, the connection strength between the connecting sheet 6 and the piezoresistor 4 is reduced, and the constraint effect on the sliding piece 9 is reduced, so that the spring 8 drives the sliding piece 9 to move so as to further separate the piezoresistor 4 from the connecting sheet 6, the air space between the piezoresistor 4 and the connecting sheet 6 is increased, the electric arc generated due to the excessively short conductive space between the piezoresistor 4 and the connecting sheet 6 is avoided, the ignition of the surge protector due to the electric arc generation is avoided, and the safety performance of the surge protector is improved; the utility model provides a surge protector is particularly suitable for the tertiary lightning protection of power.

In particular, the varistor 4 is a voltage sensitive device.

Specifically, one pin of the varistor 4 is welded to the PCB 7, and the other pin is welded to the connecting pad 6.

The applicant finds that the existing temperature fuse is characterized in that low-melting-point metal is manufactured in a small insulating shell, and heat generated by the piezoresistor 4 needs to pass through the insulating shell when the low-melting-point metal reaches the insulating shell, so that the heat transfer time is prolonged, and the fusing time of the temperature fuse is also prolonged; the embodiment of the utility model provides an in varistor 4 and connection piece 6 pass through low temperature soldering tin welding, the heat that varistor 4 produced can directly reach low temperature soldering tin, compare in current temperature fuse, the embodiment of the utility model provides an in the melting of low temperature soldering tin, accurate saying is not yet to melt, only start the degradation, be close to the molten state, it is shorter that this time can reach the time that the abundant melting could break off than temperature fuse obviously, only need be close the melting point of low temperature soldering tin, under spring 8 and slider 9's external force, connection piece 6 will break off with varistor 4 rapidly, therefore surge protector's fail safe sensitivity is higher.

Specifically, micro-gap switch 3 is normally open and normally closed switch, and when slider 9 butt micro-gap switch 3 and left micro-gap switch 3, micro-gap switch 3 conversion, original open circuit becomes closed short circuit, and original closed short circuit converts to open circuit.

Further, please refer to fig. 3, fig. 5 and fig. 6, as a specific embodiment of the surge protection device provided by the present invention, the supporting frame 2 includes two isolation plates 25, the two piezoresistors 4 are respectively disposed at two sides of the isolation plate 25, at this time, the piezoresistors 4 are respectively connected with the PCB board 7 and the connecting sheet 6 in a conductive manner without polarity separation, so as to facilitate the quick connection of the piezoresistors 4 in the circuit, thereby improving the assembly efficiency of the surge protection device; the isolation board 25 can physically isolate the two piezoresistors 4, and prevent the two piezoresistors 4 from being close to each other to cause short circuit or discharge, so that the surge protector is damaged, and the stability of the surge protector is improved.

Further, please refer to fig. 3 and 5, as the utility model provides a surge protector's a specific implementation, be equipped with guide post 21 on the support frame 2, spring 8 cover is located on guide post 21, guarantee that spring 8 can forward drive slider 9 and move, avoid the skew spring 8 to lead to spring 8 to drive the power that slider 9 moved and produce great component force, cause spring 8 can not drive slider 9 to move by furthest, thereby increase micro-gap switch 3's reaction time and piezo-resistor 4 and connect the time that contact sheet 6 from the degradation to the disconnection, guide post 21 can also restrict spring 8 and break away from the normal position.

Further, please refer to fig. 4 and 5, as a specific embodiment of the surge protector provided by the present invention, a sliding hole 91 is provided on the sliding member 9, the guiding post 21 passes through the sliding hole 91, and the spring 8 can be limited by the supporting frame 2 and the sliding member 9, so as to prevent the spring 8 from separating from the guiding post 21 from the gap between the guiding post 21 and the sliding member 9; the sliding holes 91 of the sliding member 9 prevent the guide posts 21 from abutting against the sliding member 9 and interfering with the movement of the sliding member 9.

Further, please refer to fig. 3, fig. 5 and fig. 6, as the utility model provides a surge protector's a specific implementation way, still be equipped with on the support frame 2 and dodge position 22, spring 8 locates and dodges position 22 to make the structure of spring 8, slider 9, micro-gap switch 3 and support frame 2 compacter, reduce the space that spring 8, slider 9, micro-gap switch 3 and support frame 2 occupy after assembling, thereby reduce surge protector's volume.

Further, please refer to fig. 2, fig. 3 and fig. 5, as the utility model provides a surge protector's a specific implementation, support frame 2 includes mounting groove 26, and guide post 21 sets firmly in the cell wall of mounting groove 26, and micro-gap switch 3 locates in mounting groove 26 to it is spacing with micro-gap switch 3, when avoiding slider 9 butt micro-gap switch 3, micro-gap switch 3 removes and influences surge protector's performance, and sliding guide post 21 locates on the cell wall of mounting groove 26 simultaneously, can simplify the structure, reduces the volume that reduces support frame 2.

Further, please refer to fig. 3 and 5, as the utility model provides a surge protector's a specific implementation, is equipped with turn-ups 23 on the support frame 2, and turn-ups 23 shelters from piezo-resistor 4 to carry out physical isolation with piezo-resistor 4 and discharge tube 5, PCB 7 and micro-gap switch 3 through turn-ups 23, avoid piezo-resistor 4 and its short circuit and damage surge protector.

Further, please refer to fig. 3 to 5, as the utility model provides a surge protector's a specific implementation, be equipped with fixed slider 24 on the support frame 2, be equipped with spout 92 on the slider 9, spout 92 cunning is located on fixed slider 24, fixed slider 24 can lead spout 92 to slider 9 can positive butt or break away from micro-gap switch 3, thereby shorten micro-gap switch 3's reaction time and with piezo-resistor 4 and connect the time that contact piece 6 from the degradation to the disconnection, this kind of new scheme has improved surge protector fail safe's sensitivity.

Further, referring to fig. 1, fig. 4 and fig. 5, as a specific embodiment of the surge protector provided by the present invention, the housing 1 is provided with an observation hole 111, the sliding member 9 is provided with a mark region 93, the mark region 93 is provided with at least two different colors, and color conversion is realized due to movement of the sliding member 9;

when the low-temperature soldering tin is melted, the spring 8 can push the sliding part 9 to move so as to enable the user to check the color change of the identification area 93 through the observation hole 111, so that the user can judge whether the connecting sheet 6 is disconnected with the piezoresistor 4 or not through the color change of the identification area 93 in the observation hole 111, if the user can see the color which is marked by the label area 93 and is not fused through the observation hole 111, the connecting sheet 6 is not disconnected with the piezoresistor 4, and the surge protector can still work normally; if the user can see the color of the mark on the mark area 93 marked with fusing through the observation hole 111, the connecting sheet 6 and the piezoresistor 4 are disconnected, so as to remind the user of timely replacement.

Specifically, referring to fig. 1, the observation hole 111 is disposed on the upper case 11.

Further, please refer to fig. 5, as the utility model provides a surge protector's a specific implementation, support frame 2 and PCB board 7 fixed connection, in order to guarantee to locate the stability of piezo-resistor 4 and the conductive connection of PCB board 7 on the support frame 2, improve surge protector internal circuit's stability, avoid the interval between support piece and the PCB board 7 to change and influence the stability of piezo-resistor 4 and the conductive connection of PCB board 7, can also simplify piezo-resistor 4, PCB board 7, support frame 2, discharge tube 5 etc. parts's overall arrangement in casing 1, thereby conveniently assemble surge protector.

Further, referring to fig. 1 and fig. 2, as a specific embodiment of the surge protection device provided by the present invention, the housing 1 includes an upper shell 11 and a lower shell 12 covering the upper shell 11, so as to facilitate assembling the surge protection device.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. Surge protector, including casing, micro-gap switch and support frame, its characterized in that: the device also comprises a piezoresistor, a discharge tube, a connecting sheet, a PCB, a spring and a sliding piece;

the PCB is arranged in the shell;

the piezoresistor, the connecting sheet and the discharge tube are sequentially in conductive connection;

the piezoresistor and the connecting sheet are welded through low-temperature welding tin;

the micro switch, the piezoresistor and the discharge tube are all in conductive connection with the PCB;

the piezoresistor and the sliding piece are arranged on the support frame;

the spring is arranged between the support frame and the sliding part, so that the sliding part is abutted to the connecting sheet, and under the action of the elastic force of the spring, the sliding part is abutted to the microswitch;

when the low-temperature soldering tin is melted, the spring can drive the sliding piece to be separated from the microswitch.

2. A surge protector device as claimed in claim 1, wherein: the support frame includes the division board, piezo-resistor establishes to two, two piezo-resistor locates respectively the both sides of division board.

3. A surge protector device as claimed in claim 1, wherein: the supporting frame is provided with a guide post, and the spring is sleeved on the guide post.

4. A surge protector as claimed in claim 3, wherein: the sliding piece is provided with a sliding hole, and the guide post penetrates through the sliding hole.

5. A surge protector as claimed in claim 3, wherein: the support frame is also provided with an avoidance position, and the spring is arranged on the avoidance position;

the support frame includes the mounting groove, the guide post set firmly in the cell wall of mounting groove, micro-gap switch locates in the mounting groove.

6. A surge protector device as claimed in claim 1, wherein: the support frame is provided with a flanging, and the flanging shields the piezoresistor so as to physically isolate the piezoresistor from the discharge tube, the PCB and the microswitch.

7. A surge protector device as claimed in claim 1, wherein: the supporting frame is provided with a fixed sliding block, the sliding piece is provided with a sliding groove, and the sliding groove is slidably arranged on the fixed sliding block.

8. A surge protector device as claimed in claim 1, wherein: the shell is provided with an observation hole, the sliding part is provided with a mark area, and the mark area is provided with at least two different colors;

when the low-temperature soldering tin is melted, the spring can push the sliding piece to move so that the color change of the identification area can be observed through the observation hole.

9. A surge protector device as claimed in claim 1, wherein: the support frame is fixedly connected with the PCB.

10. A surge protector device as claimed in claim 1, wherein: the shell comprises an upper shell and a lower shell which is combined with the upper shell.

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