CN111585263A - Surge protector - Google Patents

Abstract

The invention provides a surge protector which 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, wherein the microswitch is arranged on 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 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. According to the surge protector provided by the invention, when larger voltage appears in a circuit, the temperature of the piezoresistor rises, so that low-temperature soldering tin is melted, and the piezoresistor and the connecting sheet are disconnected under the driving of the sliding part and the spring, so that the microswitch is converted, failure information of the surge protector is fed back to background monitoring, and the safety failure sensitivity of the surge protector is improved.

Description

Surge protector

Technical Field

The invention belongs to the technical field of overvoltage protection, and particularly relates to a surge protection device.

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.

Disclosure of Invention

The invention aims to provide a surge protector to solve the technical problem that the sensitivity of the surge protector for safely separating from a power grid is low in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that: 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 surge protector provided by the invention has the beneficial effects that: compared with the prior art, the PCB of the surge protector is arranged in the shell so as to be protected by the shell, and the shell can prevent foreign objects from contacting the PCB so as 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 in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described 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 based on these drawings without inventive exercise.

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 problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. 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, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.

Referring to fig. 1, fig. 2, fig. 5 and fig. 6, the surge protector provided by 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 invention has the advantages that 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 prevent foreign objects from contacting the PCB 7, so that the short circuit of the surge protector is avoided; 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, so that the piezoresistor 4 is safely separated from a power grid, meanwhile, the microswitch 3 is switched, the original open circuit is changed into a closed, 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 to 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 surge protector provided by the invention is particularly suitable for three-stage lightning protection of a power supply.

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 piezoresistor 4 and the connecting sheet 6 in the embodiment of the invention are welded through the low-temperature soldering tin, the heat generated by the piezoresistor 4 can directly reach the low-temperature soldering tin, compared with the existing temperature fuse, the melting of the low-temperature soldering tin in the embodiment of the invention is not melted, only the low-temperature soldering tin starts to be degraded and approaches the melting state, obviously, the time is shorter than the time for breaking the low-temperature fuse after the low-temperature fuse is fully melted, only the melting point of the low-temperature soldering tin needs to be approached, and the connecting sheet 6 can be quickly broken from the piezoresistor 4 under the external force of the spring 8 and the sliding part 9, so the safety failure sensitivity of the surge protector 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, referring 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 on two sides of the isolation plate 25, at this time, the conductive connection between the piezoresistors 4 and the PCB board 7 and the connecting sheet 6 is not polarized, so that the piezoresistors 4 can be connected in the circuit quickly, and the assembly efficiency of the surge protection device is improved; 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, referring to fig. 3 and 5, as a specific embodiment of the surge protector provided by the present invention, the supporting frame 2 is provided with a guiding post 21, and the spring 8 is sleeved on the guiding post 21 to ensure that the spring 8 can positively drive the sliding member 9 to move, so as to avoid a situation that the spring 8 is inclined to cause a force generated by the spring 8 driving the sliding member 9 to move to generate a large component force, so that the spring 8 cannot drive the sliding member 9 to move to the maximum, thereby increasing the reaction time of the micro switch 3 and the time from degradation to disconnection of the piezoresistor 4 and the connecting tab 6, and the guiding post 21 can also limit the spring 8 from being separated from the original position.

Further, referring to fig. 4 and 5, as a specific embodiment of the surge protector provided by the present invention, the sliding part 9 is provided with a sliding hole 91, the guide post 21 passes through the sliding hole 91, and the spring 8 can be limited by the support frame 2 and the sliding part 9, so as to prevent the spring 8 from separating from the guide post 21 from the gap between the guide post 21 and the sliding part 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, referring to fig. 3, fig. 5 and fig. 6, as a specific embodiment of the surge protection device provided by the present invention, the support frame 2 is further provided with an avoiding position 22, and the spring 8 is disposed at the avoiding position 22, so that the structure of the spring 8, the sliding part 9, the micro switch 3 and the support frame 2 is more compact, and the space occupied by the spring 8, the sliding part 9, the micro switch 3 and the support frame 2 after assembly is reduced, thereby reducing the volume of the surge protection device.

Further, referring to fig. 2, fig. 3 and fig. 5, as a specific embodiment of the surge protection device provided by the present invention, the supporting frame 2 includes an installation groove 26, the guiding post 21 is fixedly disposed on a wall of the installation groove 26, the micro switch 3 is disposed in the installation groove 26 to limit the position of the micro switch 3, so as to prevent the micro switch 3 from moving when the sliding member 9 abuts against the micro switch 3 and affecting the performance of the surge protection device, and meanwhile, the sliding guiding post 21 is disposed on the wall of the installation groove 26, so as to simplify the structure and reduce the volume of the supporting frame 2.

Further, referring to fig. 3 and 5, as a specific embodiment of the surge protection device provided by the present invention, a flange 23 is disposed on the supporting frame 2, and the flange 23 shields the varistor 4, so that the varistor 4 is physically isolated from the discharge tube 5, the PCB 7 and the microswitch 3 by the flange 23, and the varistor 4 is prevented from being short-circuited therewith to damage the surge protection device.

Further, referring to fig. 3 to 5, as a specific embodiment of the surge protector provided by the present invention, a fixed slider 24 is disposed on the supporting frame 2, a sliding slot 92 is disposed on the sliding member 9, the sliding slot 92 is slidably disposed on the fixed slider 24, the fixed slider 24 can be guided to the sliding slot 92, so that the sliding member 9 can be positively abutted against or disengaged from the micro switch 3, thereby shortening the reaction time of the micro switch 3 and the time from the deterioration to the disconnection of the varistor 4 and the connecting tab 6, and this new scheme improves the sensitivity of the surge protector to safety failure.

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 area 93, the mark area 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, referring to fig. 5, as a specific embodiment of the surge protection device provided by the present invention, the supporting frame 2 is fixedly connected to the PCB board 7, so as to ensure the stability of the conductive connection between the varistor 4 and the PCB board 7 disposed on the supporting frame 2, improve the stability of the internal circuit of the surge protection device, avoid the change of the distance between the supporting member and the PCB board 7, which affects the stability of the conductive connection between the varistor 4 and the PCB board 7, and simplify the layout of the varistor 4, the PCB board 7, the supporting frame 2, the discharge tube 5, and other components in the housing 1, thereby facilitating the assembly of the surge protection device.

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

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle 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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