CN111585263A - Surge protector - Google Patents

Abstract

The invention provides a surge protector, comprising a casing, a micro switch, a support frame, a varistor, a discharge tube, a connecting piece, a PCB board, a spring and a sliding part; the piezoresistor, the connecting piece and the discharge tube are in sequence Conductive connection; the varistor and the connecting piece are welded by low temperature soldering; the micro switch, varistor and discharge tube are all conductively connected to the PCB board; The connecting piece is connected, and the sliding piece is in contact with the microswitch under the elastic force of the spring; when the low-temperature solder melts, the spring can drive the sliding piece away from the microswitch. In the surge protector provided by the invention, when a large voltage appears in the circuit, the temperature of the varistor rises, causing the low-temperature solder to melt, and the varistor and the connecting piece are disconnected under the driving of the slider and the spring, so that the micro-motion The switch realizes the conversion, and feeds back the information of the failure of the surge protector to the background monitoring, which improves the safety failure sensitivity of the surge protector.

Description

Surge protector

technical field

The invention belongs to the technical field of overcurrent protection, and more particularly, relates to a surge protector.

Background technique

In the power system, high voltages are often encountered due to lightning induction, capacitive loads, and inductive loads. These high voltages can cause damage to electrical equipment. Surge protector (SPD, commonly known as lightning protector) is usually connected in parallel with electrical equipment in the circuit, and uses the voltage-sensitive characteristics of SPD to protect electrical equipment from various overvoltage damage, especially expensive, precise and uninterrupted electrical equipment, such as communication base station computer room, financial system, stock trading system, high-value electrical equipment and other electricity-related equipment and systems, the use of surge protectors can protect these equipment and systems from lightning or other causes However, all surge protectors need to be quickly, effectively and safely disconnected from the power grid when they reach their own tolerance limits, otherwise they will often cause circuit short-circuits or even fires, so surge protectors Sensitivity to safe failures is extremely important.

In the surge protector in the prior art, the varistor is connected to the thermal fuse. When the voltage in the circuit is too large, the temperature of the varistor rises until it reaches the melting point of the thermal fuse, and it takes a period of time. The fuse can only be disconnected, and the process of this thermal fuse blowing often takes several seconds, so that when the surge protector encounters extreme conditions, the sensitivity of safe disconnection from the grid is low. even cause a fire.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a surge protector to solve the technical problem of the low sensitivity of the surge protector to safely disconnect from the power grid in the prior art.

In order to achieve the above object, the technical scheme adopted in the present invention is to provide a surge protector, which includes a housing, a micro switch, a support frame, a varistor, a discharge tube, a connecting piece, a PCB board, a spring and a slider;

the PCB board is arranged in the housing;

The varistor, the connecting piece and the discharge tube are electrically connected in sequence;

The varistor and the connecting piece are welded by low temperature solder;

The micro switch, the varistor and the discharge tube are all conductively connected to the PCB board;

The varistor and the sliding member are both arranged on the support frame;

The spring is arranged between the support frame and the sliding member, so that the sliding member abuts the connecting piece, and under the elastic force of the spring, the sliding member abuts the micro switch ;

When the low-temperature solder is melted, the spring can drive the sliding member away from the micro switch.

Further, the support frame includes an isolation plate, two varistors are provided, and the two varistors are respectively arranged on two sides of the isolation plate.

Further, a guide post is provided on the support frame, and the spring is sleeved on the guide post.

Further, the sliding member is provided with a sliding hole, and the guide post passes through the sliding hole.

Further, an escape position is also provided on the support frame, and the spring is arranged at the escape position;

The support frame includes an installation slot, the guide post is fixed on the slot wall of the installation slot, and the micro switch is arranged in the installation slot.

Further, the support frame is provided with a flange, and the flange shields the varistor to physically isolate the varistor from the discharge tube, the PCB board and the micro switch.

Further, the support frame is provided with a fixed slider, the sliding member is provided with a chute, and the chute is slidably arranged on the fixed slider.

Further, the casing is provided with an observation hole, the slider is provided with an identification area, and the identification area is provided with at least two different colors;

When the low temperature solder is melted, the spring can push the slider to move so that the color change of the identification area can be viewed through the observation hole.

Further, the support frame is fixedly connected to the PCB board.

Further, the housing includes an upper case and a lower case covered with the upper case.

The beneficial effect of the surge protector provided by the present invention is that compared with the prior art, the PCB board of the surge protector of the present invention is arranged in the casing, so as to protect the PCB board through the casing, and the casing can also prevent foreign objects from interacting with Contact with the PCB board to avoid short circuit of the surge protector; the varistor, the connecting piece and the discharge tube are conductively connected in turn, and the micro switch, the varistor and the discharge tube are all conductively connected to the PCB board, so as to connect the micro switch, the varistor and the discharge tube. , The connecting piece and the discharge tube are conductively connected to the PCB board to form a protection circuit; the support frame is used to support the varistor and the sliding piece; the spring is arranged between the support frame and the sliding piece, and can drive the sliding piece to abut the connecting piece , under the action of the elastic force of the spring, the slider is in contact with the micro switch to maintain a state of the micro switch, and the background monitoring information shows that the surge protector is normal; when struck by lightning, a large voltage appears in the circuit , the varistor and the discharge tube are both turned on, the varistor in the circuit generates heat and accumulates heat to melt the low-temperature solder connecting the varistor and the connecting piece, and in the process of melting the low-temperature solder, the spring drives the sliding Therefore, the sliding piece will accelerate the disconnection between the connecting piece and the varistor pin, so as to reduce the time from deterioration to disconnection between the varistor and the connecting piece, and the varistor and the varistor After the connection piece is disconnected, the varistor can be safely disconnected from the power grid to avoid fire. At the same time, because the sliding part loses its restraint, the spring will drive the sliding part to move and disengage from the micro switch to drive the micro switch to switch state and transmit the fault of the surge protector to the user. information, so that the user can deal with it in time, the mechanical movement of the sliding part is driven by the spring, supplemented by the characteristic that the low-temperature solder melts due to the heating of the varistor in the case of overvoltage, only the low-temperature solder needs to be initially close to the melting point. In this case, the connection piece can be disconnected from the varistor, and the electrical safety distance can be opened, and the thermal fuse can not be disconnected until the temperature reaches the melting point for a period of time, which takes a long time, and because the disconnecting distance of the thermal fuse is relatively short. Compared with the traditional scheme using thermal fuse, this new solution has short response time, high sensitivity, and no current arcing, which is safe and reliable, and has great advantages.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

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

FIG. 2 is a schematic diagram of the explosion structure of the surge protector shown in FIG. 1;

Fig. 3 is an enlarged view of the support frame in Fig. 2;

Fig. 4 is an enlarged view of the sliding member in Fig. 2;

Fig. 5 is the assembly schematic diagram of the partial structure of Fig. 2;

FIG. 6 is an assembly schematic diagram of the partial structure of FIG. 2 .

Among them, each reference sign in the figure:

1. Shell; 11. Upper shell; 111. Observation hole; 12. Lower shell; 2. Support frame; 21. Guide column; 22. Avoidance; 23. Flanging; ;26, installation slot; 3, micro switch; 4, varistor; 5, discharge tube; 6, connecting piece; 7, PCB board; 8, spring; 9, sliding part; 91, sliding hole; 92, sliding Slot; 93. Identification area.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or 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 indirectly connected to the other element.

It is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device. Or elements must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

Please refer to FIG. 1 , FIG. 2 , FIG. 5 and FIG. 6 , the surge protector provided by the present invention will now be described. Surge protector, including shell 1, micro switch 3, support frame 2, varistor 4, discharge tube 5, connector 6, PCB board 7, spring 8 and slider 9;

The PCB board 7 is arranged in the housing 1;

The varistor 4, the connecting piece 6 and the discharge tube 5 are electrically connected in sequence;

The varistor 4 and the connecting piece 6 are welded by low temperature solder;

The micro switch 3, the varistor 4 and the discharge tube 5 are all conductively connected with the PCB board 7;

The varistor 4 and the slider 9 are both arranged on the support frame 2;

The spring 8 is arranged between the support frame 2 and the sliding member 9, so that the sliding member 9 abuts the connecting piece 6, and under the elastic force of the spring 8, the sliding member 9 abuts the micro switch 3;

When the low-temperature solder melts, the spring 8 can drive the slider 9 to separate from the micro switch 3 .

In the surge protector provided by the present invention, compared with the prior art, the PCB board 7 is arranged in the housing 1 so as to protect the PCB board 7 through the housing 1, and the housing 1 can also prevent foreign objects from contacting the PCB board 7. Avoid the short circuit of the surge protector; the varistor 4, the connecting piece 6 and the discharge tube 5 are electrically connected in turn, and the micro switch 3, the varistor 4 and the discharge tube 5 are all conductively connected with the PCB board 7, so as to connect the micro switch 3 , the varistor 4, the connecting piece 6 and the discharge tube 5 are conductively connected on the PCB board 7, thereby forming a protection circuit and a remote signaling state conversion circuit; the support frame 2 is used to support the varistor 4 and the slider 9; the spring 8 is provided It is located between the support frame 2 and the sliding member 9, and can drive the sliding member 9 to abut the connecting piece 6. Under the elastic force of the spring 8, the sliding member 9 is in contact with the micro switch 3 again. At this time, the micro switch 3 is in a position. When the surge protector is struck by lightning beyond its own tolerance or abnormal overvoltage occurs, the varistor 4 and the discharge tube 5 are both conductive. The varistor 4 in the circuit generates heat and accumulates heat until the low-temperature solder connecting the varistor 4 and the connecting piece 6 is melted. During the process of melting the low-temperature solder, the spring 8 drives the slider 9 to abut the connection. Therefore, the sliding member 9 will speed up the disconnection of the connecting piece 6 and the varistor 4, so as to reduce the time for the varistor 4 and the connecting piece 6 from deterioration to disconnection, and the varistor 4 4 After disconnecting from the connecting piece 6, since the sliding member 9 loses its restraint, the spring 8 will drive the sliding member 9 to move and separate from the micro switch 3, causing the varistor 4 to be safely disconnected from the power grid, and the micro switch 3 is converted at the same time, the original open circuit. It becomes a closed short circuit, and the original closed short circuit is converted into an open circuit. This conversion will transmit the corresponding fault information to the user, so that the user can deal with it in time. The mechanical movement of the slider 9 is driven by the spring 8 to shorten the connection piece 6 and the varistor 4. From deterioration to disconnection, this new solution improves the sensitivity of the surge protector to safe failure; when the low-temperature solder melts, the connection strength between the connecting piece 6 and the varistor 4 is reduced, and the sliding member 9 is bound The effect is reduced, so the spring 8 drives the sliding member 9 to move to further separate the varistor 4 and the connecting piece 6, increase the air distance between the varistor 4 and the connecting piece 6, and avoid the varistor 4 and the connecting piece 6. The electric arc is generated due to the short conductive spacing of the electric arc, which avoids the ignition of the surge protector due to the arc, thereby improving the safety performance of the surge protector; the surge protector provided by the invention is especially suitable for the three-level lightning protection of the power supply.

Specifically, the varistor 4 is a voltage sensitive device.

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

The applicant found that the existing thermal fuse is made of low melting point metal in a very small insulating shell, and the heat generated by the varistor 4 needs to pass through the insulating shell to reach the low melting point metal, thus increasing the heat transfer time, The fusing time of the thermal fuse is also increased; the varistor 4 and the connecting piece 6 in the embodiment of the present invention are welded by low-temperature solder, and the heat generated by the varistor 4 can directly reach the low-temperature solder. Compared with the existing thermal fuse, The melting of the low-temperature solder in the embodiment of the present invention, to be precise, has not yet reached the melting point, but just begins to deteriorate and is close to the melting state. Obviously, this time will be shorter than the time for the thermal fuse to be fully melted before it can be disconnected. It only needs to be close to At the melting point of the low-temperature solder, under the external force of the spring 8 and the slider 9, the connecting piece 6 will be quickly disconnected from the varistor 4, so the safety failure sensitivity of the surge protector is higher.

Specifically, the micro switch 3 is a normally open and normally closed switch. When the slider 9 abuts against the micro switch 3 and leaves the micro switch 3, the micro switch 3 is switched, the original open circuit becomes a closed short circuit, and the original closed circuit A short circuit is converted to an open circuit.

Further, please refer to FIG. 3 , FIG. 5 and FIG. 6 , as a specific embodiment of the surge protector provided by the present invention, the support frame 2 includes an isolation plate 25 , the varistor 4 is set to two, and the two voltage The varistor 4 is respectively arranged on both sides of the isolation plate 25. At this time, the conductive connection between the varistor 4 and the PCB board 7 and the connecting piece 6 is irrespective of polarity, which is convenient for quickly connecting the varistor 4 in the circuit, thereby improving the performance of the circuit. The assembly efficiency of the surge protector is improved; the isolation plate 25 can physically isolate the two varistors 4 to avoid short circuit or discharge of the two varistors 4 close to each other, so that the surge protector is damaged, thereby improving the surge protection device stability.

Further, please refer to FIG. 3 and FIG. 5, as a specific embodiment of the surge protector provided by the present invention, the support frame 2 is provided with a guide column 21, and the spring 8 is sleeved on the guide column 21 to ensure that the spring 8 It can drive the sliding member 9 to move in a positive direction, avoiding the skew of the spring 8 and causing the force of the spring 8 to drive the sliding member 9 to move to produce a larger force, so that the spring 8 cannot drive the sliding member 9 to the maximum extent, thereby increasing the microswitch 3. The reaction time and the time from the deterioration to the disconnection of the varistor 4 and the connecting piece 6, the guide post 21 can also limit the spring 8 from disengaging from its original position.

Further, please refer to FIG. 4 and FIG. 5 , as a specific embodiment of the surge protector provided by the present invention, the sliding member 9 is provided with a sliding hole 91 , and the guide post 21 passes through the sliding hole 91 and can pass through the support frame. 2 and the slider 9 limit the spring 8 to prevent the spring 8 from separating from the guide column 21 from the gap between the guide column 21 and the slider 9; the sliding hole 91 on the slider 9 can prevent the guide column 21 from pressing against the slider 9 and Interfere with the movement of the slider 9 .

Further, please refer to FIG. 3 , FIG. 5 and FIG. 6 , as a specific embodiment of the surge protector provided by the present invention, the support frame 2 is further provided with an escape position 22 , and the spring 8 is set at the escape position 22 to The structure of the spring 8, the slider 9, the micro switch 3 and the support frame 2 is more compact, and the space occupied by the spring 8, the slider 9, the micro switch 3 and the support frame 2 after assembly is reduced, thereby reducing the surge protection volume of the device.

Further, please refer to FIG. 2 , FIG. 3 and FIG. 5 , as a specific embodiment of the surge protector provided by the present invention, the support frame 2 includes an installation groove 26 , and the guide post 21 is fixed on the groove wall of the installation groove 26 , the micro switch 3 is arranged in the installation groove 26 to limit the micro switch 3 to prevent the micro switch 3 from moving and affecting the performance of the surge protector when the slider 9 abuts against the micro switch 3, while the sliding guide The column 21 is arranged on the groove wall of the installation groove 26 , which can simplify the structure and reduce the volume of the support frame 2 .

Further, please refer to FIG. 3 and FIG. 5, as a specific embodiment of the surge protector provided by the present invention, the support frame 2 is provided with a flange 23, and the flange 23 shields the varistor 4 to pass the flange 23 Physically isolate the varistor 4 from the discharge tube 5, the PCB board 7 and the micro switch 3 to prevent the varistor 4 from being short-circuited and damaging the surge protector.

Further, please refer to FIG. 3 to FIG. 5 , as a specific embodiment of the surge protector provided by the present invention, the support frame 2 is provided with a fixed sliding block 24 , the sliding member 9 is provided with a chute 92 , and the chute 92 is slid on the fixed slider 24, and the fixed slider 24 can guide the chute 92, so that the slider 9 can positively contact or disengage the micro switch 3, thereby shortening the response time of the micro switch 3 and the varistor 4 and the connecting piece 6 from the deterioration to the disconnection time, this new scheme improves the sensitivity of the surge protector to fail safely.

Further, please refer to FIG. 1 , FIG. 4 and FIG. 5 , as a specific embodiment of the surge protector provided by the present invention, the casing 1 is provided with an observation hole 111 , and the slider 9 is provided with an identification area 93 , The identification area 93 is provided with at least two different colors, and the color conversion is realized due to the movement of the slider 9;

When the low-temperature solder melts, the spring 8 can push the slider 9 to move so that the color change of the identification area 93 can be checked through the observation hole 111 , so that the user can judge the color change of the identification area 93 in the observation hole 111 to determine the connection between the connecting piece 6 and the Whether the varistor 4 is disconnected, if the user can see the color on the identification area 93 through the observation hole 111 indicating that it is not blown, it means that the connecting piece 6 and the varistor 4 are not disconnected, and the surge protector can still be normal. Work; if the user can see the color indicating the fuse on the identification area 93 through the observation hole 111, it means that the connecting piece 6 and the varistor 4 have been disconnected, so as to remind the user to replace it in time.

Specifically, please refer to FIG. 1 , the observation hole 111 is provided on the upper case 11 .

Further, please refer to FIG. 5 , as a specific embodiment of the surge protector provided by the present invention, the support frame 2 is fixedly connected with the PCB board 7 to ensure that the varistor 4 arranged on the support frame 2 is connected to the PCB board. 7 The stability of the conductive connection improves the stability of the internal circuit of the surge protector, avoids the change in the distance between the support and the PCB board 7 and affects the stability of the conductive connection between the varistor 4 and the PCB board 7, and can also simplify The layout of the varistor 4, the PCB board 7, the support frame 2, the discharge tube 5 and other components in the housing 1 is convenient for assembling the surge protector.

Further, please refer to FIG. 1 and FIG. 2, as a specific embodiment of the surge protector provided by the present invention, the casing 1 includes an upper casing 11 and a lower casing 12 covered with the upper casing 11, so as to facilitate the assembly of the electrical surge protector.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

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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