Surge protection device with piezoresistor disc

Abstract

According to the surge protection device with the voltage dependent resistor disc, the insulating heat conduction layer is coated on the outer surface of the voltage dependent resistor disc, and the heat dissipation fin array is tightly abutted against the insulating heat conduction layer, so that the conduction efficiency of heat from the voltage dependent resistor disc to the heat dissipation mechanism is effectively improved. Meanwhile, a heat conduction cavity is formed between the heat conduction plate and the shell, heat conduction filler is arranged in the heat conduction cavity, and an efficient heat conduction path is formed by the heat conduction filler and the heat dissipation holes in the shell, so that heat generated by the piezoresistor disc can be quickly dissipated through the heat dissipation fin array, is transmitted to the shell through the heat conduction cavity and is discharged through the heat dissipation holes; the high-efficiency heat dissipation of the piezoresistor disc is further realized, the overheating fault caused by the accumulation of the heat generated in the conduction process of the piezoresistor disc in the shell is avoided, the service life of the surge protection device is further prolonged, and the use safety and stability of the surge protection device are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of surge protector, especially to a surge protector containing a varistor disc. BACKGROUND

[0002] Surge protectors are common electronic devices designed to protect circuits from damage caused by transient overvoltages. Common surge protectors usually contain a varistor disc as the main component, which can quickly conduct when encountering overvoltage, leading excess current into the ground wire, thereby protecting the back-end electronic devices from damage.

[0003] However, as the integration and power density of electronic devices continue to increase, the working environment of surge protectors is becoming increasingly harsh. Especially in high-power or frequently subjected to surge impact application scenarios, the varistor disc will generate a large amount of heat during conduction, which, if not promptly and effectively dissipated, will not only cause the varistor disc to degrade in performance, but may even cause overheating failure, posing a serious threat to the safety of circuits and devices.

[0004] Therefore, it is necessary to provide a surge protector with good heat dissipation performance. SUMMARY

[0005] In view of the need for the varistor disc of the existing technology to promptly dissipate the large amount of heat generated during conduction, the utility model provides a surge protector containing a varistor disc with good heat dissipation performance.

[0006] A surge protector containing a varistor disc, comprising a housing, a varistor disc, a first pin, a second pin, and a heat dissipation mechanism; the housing is internally provided with a carrier; the carrier is internally provided with a mounting plate, and the varistor disc is mounted on the first side of the mounting plate; the varistor disc is provided with a first electrode and a second electrode, and the outer surface of the varistor disc is covered with an insulating heat-conductive layer; the first pin is connected with the first electrode; the second pin is connected with the second electrode; and the first pin and the second pin both extend out of the housing for plugging; the heat dissipation mechanism comprises an array of heat dissipation fins arranged on one side of the varistor disc, one end of the array of heat dissipation fins abuts against the insulating heat-conductive layer, and the other end is connected with a heat-conductive plate; the four edges of the heat-conductive plate extend horizontally towards the housing until abutting against the inner side of the housing, so that a heat-conductive cavity is formed between the heat-conductive plate and the housing, and the heat-conductive cavity is provided with heat-conductive filler; the housing is provided with a plurality of heat dissipation holes, and the heat dissipation holes are in communication with the heat-conductive cavity.

[0007] Further, the heat-conductive filler is a heat-conductive silica gel.

[0008] Further, the heat-conductive filler comprises a first heat-conductive silica gel and a second heat-conductive silica gel, a sealed cavity is arranged between the first heat-conductive silica gel and the second heat-conductive silica gel, and a phase-change heat-conductive material is arranged in the sealed cavity.

[0009] Further, the heat-dissipation fin array comprises a plurality of first heat-dissipation fins arranged along the length direction of one side of the piezoresistor, and a second heat-dissipation fin is arranged between adjacent first heat-dissipation fins along the length direction of one side of the piezoresistor, the height of the first heat-dissipation fin is greater than the height of the second heat-dissipation fin, and the first heat-dissipation fin abuts against the heat-conductive plate.

[0010] Further, the shell is provided with a plurality of transverse grooves and a U-shaped opening on both sides of the shell, which facilitate plugging and unplugging of the surge protector.

[0011] Further, the heat-conductive plate is made of aluminum-copper alloy.

[0012] Further, the first pin comprises a pin body and a thermal trip unit, and the thermal trip unit is respectively welded to the pin body and the first electrode through a low-melting-point alloy.

[0013] Further, the mounting plate is provided with a mounting hole penetrating through both sides; the carrier frame is provided with a mounting groove in communication with the second electrode, the first electrode penetrates through the mounting hole and is welded to the thermal trip unit, and the second electrode penetrates through the mounting groove and is welded to one end of the second pin.

[0014] Further, the device further comprises a tripping mechanism, the tripping mechanism comprises a rotating shaft arranged on the second side of the mounting plate and a rotating member; the shell is provided with an observation window on the top thereof, and the carrier frame is provided with a fault state indicating area on the top thereof; the fault state indicating area is opposite to the observation window; the rotating member is provided with a first end corner, a second end corner and a third end corner, the first end corner is rotatably arranged on the rotating shaft, an abutting rod is connected to one end of the first end corner close to the shell, the second end corner is located on one side of the thermal trip unit, and the third end corner is located above the fault state indicating area and opposite to one side of the observation window; the normal state indicating area and the fault state indicating area are marked with different colors; the shell is provided with an opening on the bottom thereof, when a surge protector is plugged into a socket, the abutting rod penetrates through the opening to trigger a micro switch in the socket, the rotating member rotates around the rotating shaft to make the second end corner abut against the thermal trip unit, and the normal state indicating area is located directly below the observation window; after the thermal trip unit is unwelded, the rotating member continues to rotate around the rotating shaft to drive the abutting rod to be separated from the micro switch, and the third end corner is away from the observation window, so that the fault state indicating area is located directly below the observation window.

[0015] Further, a limiting plate is arranged on the mounting plate above the thermal trip, and after the thermal trip is de-welded, the rotating member continues to rotate along the direction close to the thermal trip around the rotating shaft until abutting against the limiting plate.

[0016] The utility model discloses a kind of surge protectors containing piezoresistor, by insulating heat conducting layer is coated on the outer surface of piezoresistor, and setting up heat dissipation fin array and it is closely abutted, effectively improve the conduction efficiency of heat from piezoresistor to heat dissipation mechanism.Meanwhile, heat conducting cavity is formed between heat conducting plate and shell, and heat conducting filler is set in heat conducting cavity, and with the heat dissipation hole on shell forms a high-efficiency heat conduction path, so that the heat generated by piezoresistor can be rapidly dissipated through heat dissipation fin array and transmitted to shell through heat conducting cavity, and is discharged through heat dissipation hole, further realize the efficient heat dissipation of piezoresistor, avoid the heat generated in piezoresistor conducting process from being accumulated in shell to cause overheating failure, and then extend the service life of surge protector, improve the security and stability of surge protector use. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a whole structure schematic diagram of the surge protector containing piezoresistor provided by the utility model;

[0018] Figure 2 It is a side structure schematic diagram of the surge protector containing piezoresistor provided by the utility model;

[0019] Figure 3 It is a cross section structure schematic diagram of the surge protector containing piezoresistor provided by the utility model;

[0020] Figure 4 It is Figure 3 A portion enlarged structure schematic diagram of;

[0021] Figure 5 It is piezoresistor structure schematic diagram provided by the utility model;

[0022] Figure 6 It is bearing frame and its internal structure schematic diagram provided by the utility model;

[0023] Figure 7 It is the schematic diagram of the tripping state of the unhooking mechanism provided by the utility model;

[0024] Figure 8 It is the structure schematic of first electrode connecting piece provided by the utility model;

[0025] Figure 9 It is the structure schematic of second electrode connecting piece provided by the utility model.

[0026] DRAWINGS

[0027] 1. Housing; 2. Varistor; 201. First electrode; 202. Second electrode; 3. First pin; 301. Pin body; 302. Thermal release element; 4. Second pin; 5. Support frame; 501. Mounting slot; 6. Mounting plate; 601. Mounting hole; 7. Heat sink array; 8. Heat-conducting plate; 9. Heat-conducting cavity; 10. Heat-conducting filler; 11. Heat dissipation hole; 12. Horizontal groove; 13. U-shaped opening; 14. Rotating shaft; 15. Rotating component; 151. First end angle; 152. Second end angle; 153. Third end angle; 16. Observation window; 17. Fault status indication area; 18. Normal status indication area; 19. Opening; 20. Limiting plate. Detailed Implementation

[0028] To provide a more detailed description of this utility model, the following description is provided in conjunction with the accompanying drawings. It should be noted that the embodiments described below are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0029] Example 1

[0030] refer to Figure 1 As shown, for reference Figure 1 and Figure 3 As shown, a surge protector containing a varistor includes a housing 1, a varistor 2, a first pin 3, a second pin 4, and a heat dissipation mechanism (not shown in the figure).

[0031] Specifically, refer to Figure 5 , Figure 6 As shown, a support frame 5 is provided inside the housing 1; a mounting plate 6 is provided inside the support frame 5, and the varistor 2 is mounted on the first side of the mounting plate 6; a first electrode 201 and a second electrode 202 are provided on the varistor 2, and an insulating and thermally conductive layer (not shown in the figure) is covered on the outer surface of the varistor 2.

[0032] The application of the insulating and thermally conductive layer not only effectively insulates and protects the position of the varistor 2, but also prevents damage caused by internal and external environmental factors after prolonged use, achieving good insulation and effectively isolating the varistor 2 from electrical contact with the external environment. Simultaneously, it improves the heat dissipation performance of the varistor 2. In this embodiment, the insulating and thermally conductive layer is made of silicone rubber.

[0033] The first pin 3 is connected with the first electrode 201, the second pin 4 is connected with the second electrode 202, and the first pin 3 and the second pin 4 both extend out of the shell 1 for plugging on a socket matched with the surge protector.

[0034] Referring to Figure 1 , Figure 3 and Figure 4 , the heat dissipation mechanism includes a heat dissipation fin array 7 arranged on one side of the pressure sensitive resistor sheet 2. One end of the heat dissipation fin array 7 abuts against the insulating heat conducting layer, and the other end is connected with a heat conducting plate 8. The four edges of the heat conducting plate 8 extend horizontally in the direction close to the shell 1 until abutting against the inner side of the shell 1, so that a heat conducting cavity 9 is formed between the heat conducting plate 8 and the shell 1, and the heat conducting cavity 9 is provided with heat conducting filler 10. The shell 1 is provided with a plurality of heat dissipation holes 11, and the heat dissipation holes 11 are communicated with the heat conducting cavity 9. In this embodiment, the heat conducting plate 8 is made of aluminum-copper alloy.

[0035] The heat dissipation fin array 7 directly abuts against the insulating heat conducting layer, can quickly absorb the heat generated by the pressure sensitive resistor sheet 2, and quickly dissipate the heat, effectively improving the conduction efficiency of the heat from the pressure sensitive resistor sheet 2 to the heat dissipation mechanism. At the same time, the heat conducting cavity 9 is formed between the heat conducting plate 8 and the shell 1, and the heat conducting filler 10 is arranged inside the heat conducting cavity 9, and forms a high-efficiency heat conduction path with the heat dissipation holes 11 on the shell 1, so that the heat generated by the pressure sensitive resistor sheet 2 can be quickly dissipated through the heat dissipation fin array 7 and transmitted to the shell 1 through the heat conducting cavity 9, and discharged through the heat dissipation holes 11, further realizing high-efficiency heat dissipation of the pressure sensitive resistor sheet 2, avoiding the overheat failure caused by the heat accumulation in the shell 1 during the conduction of the pressure sensitive resistor sheet 2, and prolonging the service life of the surge protector and improving the safety and stability of the surge protector.

[0036] The heat dissipation fin array 7 includes a plurality of first heat dissipation fins arranged in an array along the length direction of one side of the pressure sensitive resistor sheet 2, and a second heat dissipation fin is arranged between adjacent first heat dissipation fins along the length direction of one side of the pressure sensitive resistor sheet 2. The height of the first heat dissipation fin is greater than the height of the second heat dissipation fin, and the first heat dissipation fin abuts against the heat conducting plate 8.

[0037] The height difference between the first heat dissipation fin and the second heat dissipation fin can form a stepped air flow channel, and the air flow generates a turbulent effect when flowing through, breaking the laminar boundary layer, and thus being conducive to improving the convective heat transfer efficiency and improving the heat dissipation speed.

[0038] The heat-conducting filler 10 comprises a first heat-conducting silica gel 101 and a second heat-conducting silica gel 102, and a closed containing cavity (not shown in the figure) is arranged between the first heat-conducting silica gel 101 and the second heat-conducting silica gel 102, and a phase-change heat-conducting material 103 is arranged in the closed containing cavity.

[0039] The first heat-conducting silica gel 101 and the second heat-conducting silica gel 102 serve as high-efficiency heat-conducting media, and can rapidly transmit heat from the heat-conducting plate 8 to the shell 1. Meanwhile, the closed containing cavity containing the phase-change heat-conducting material 103 is arranged between the first heat-conducting silica gel 101 and the second heat-conducting silica gel 102, and the phase-change heat-conducting material 103 will change phase from solid to liquid or gas at a specific temperature, and then absorb or release a large amount of heat, so as to significantly reduce the temperature gradient and improve the uniformity of heat dissipation, thereby improving the overall heat dissipation efficiency. In this embodiment, the phase-change heat-conducting material 103 is composed of paraffin, expanded graphite rings and ceramic nanoparticles.

[0040] In some embodiments, the heat-conducting filler 10 is a heat-conducting silica gel.

[0041] Reference Figure 2 As shown, the shell 1 is provided with a plurality of transverse grooves 12 facilitating plugging and unplugging of the surge protector and a U-shaped opening 13. The transverse grooves 12 can increase the friction between the pluggable hand and the shell 1, and the U-shaped opening facilitates the pressing force of the pluggable hand on the outside of the shell, thereby improving the plugging efficiency.

[0042] Embodiment 2

[0043] Reference Figure 6 、 Figure 8 、 Figure 9 As shown, embodiment 2 is compared with embodiment 1, and the difference between them is that the first pin 3 comprises a pin body 301 and a thermal trip 302, and the thermal trip 302 is respectively welded to the pin body 301 and the first electrode 201 through a low-melting-point alloy. In this embodiment, the low-melting-point alloy is Field's alloy.

[0044] When abnormal current or excessively high temperature occurs in the circuit, the low-melting-point alloy will melt, causing the connection between the thermal trip 302 and the first pin 3 and the first electrode 201 to be disconnected, thereby rapidly cutting off the circuit and preventing the occurrence of safety accidents such as equipment damage or fire, and thereby improving the reliability and safety of the surge protector.

[0045] Reference Figure 6 、 Figure 7As shown, the mounting plate 6 is provided with through-holes 601 on both sides; the carrier 5 is provided with a mounting groove 501 on one side for the second electrode; the first electrode 201 passes through the through-hole 601 and is welded to the thermal tripping device 302; and the second electrode 202 passes through the mounting groove 501 and is welded to one end of the second pin 4.

[0046] The thermal tripping device 302 is isolated from the heat dissipation mechanism by the mounting plate 6, the first electrode 201 passes through the mounting plate 6, and the second electrode 202 passes through the mounting groove 501, thereby greatly reducing the influence of the heat dissipation mechanism on the thermal tripping device 302.

[0047] The surge protector further comprises a tripping mechanism (not shown in the figure), which comprises a rotating shaft 14 arranged on the second side of the mounting plate 6 and a rotating member 15; the top of the shell 1 is provided with an observation window 16, and the top of the carrier 5 is provided with a fault state indicating area 17; the fault state indicating area 17 is opposite to the observation window 16.

[0048] The rotating member 15 is provided with a first end angle 151, a second end angle 152 and a third end angle 153, the first end angle 151 is rotatably installed on the rotating shaft 14, and is connected to an abutting rod 154 near one end of the shell 1, the second end angle 152 is located on one side of the thermal tripping device 302; the third end angle 253 is located above the fault state indicating area 17, and the third end angle 153 is provided with a normal state indicating area 18 on the side opposite to the observation window 16; the normal state indicating area 18 and the fault state indicating area 17 are marked with different colors.

[0049] The bottom of the shell 1 is provided with an opening 19, when a surge protector is plugged into a socket, the abutting rod 154 passes through the opening 19 to trigger the micro switch in the socket, the rotating member 15 rotates around the rotating shaft 14 to make the second end angle 152 abut against the thermal tripping device 302, and the normal state indicating area 18 is located directly below the observation window 16.

[0050] When the surge protection module is plugged into a socket, the micro switch abuts against the abutting rod 154 and gives the abutting rod 154 an upward force, the abutting rod 154 is connected to the first end angle, thereby making the rotating member 15 rotate around the rotating shaft 14 in the direction of approaching the thermal tripping device 302, i.e. in the clockwise direction, until it abuts against the thermal tripping device 302, at this time the pressure-sensitive resistor 2 works normally, and the normal state indicating area 18 can be observed through the observation window 16 to indicate that the pressure-sensitive resistor is in normal use.

[0051] When the thermal trip 302 is unbolted, the rotating part 15 continues to rotate around the rotating shaft 14 and drives the abutting rod 154 to be separated from the micro switch, and the third end angle 153 is away from the observation window 16, so that the fault state indicating area 17 is located directly below the observation window 16.

[0052] When the low-melting-point alloy at both ends of the thermal trip 302 melts at high temperature, the connection between the thermal trip 302 and the first electrode 201 and the first pin 3 is disconnected, so that the thermal trip 302 is unbolted, and the pressure-sensitive resistor sheet 2 is in a tripped state. At this time, the thermal trip 302 falls to make the second end angle 152 lose the limiting support of the thermal trip 302. Since the position of the rotating shaft 14 is located at the first end angle 151, i.e. the center of gravity is offset to the side of the first end angle 151, under the action of gravity, the second end angle 152 which loses abutment drives the rotating part 15 to rotate around the rotating shaft 14 in the direction of approaching the thermal trip 302, i.e. continues to rotate in the clockwise direction, so that the normal state indicating area 18 on the first end angle 151 is away from the observation window 16, and further makes the fault state indicating area 17 located directly below the observation window 16. The fault state indicating area 17 can be seen from the observation window 16 to indicate that the pressure-sensitive resistor sheet 2 is in a tripped state.

[0053] The mounting plate 6 above the thermal trip 302 is provided with a limiting plate 20. After the thermal trip 302 is unbolted, the rotating part 15 continues to rotate around the rotating shaft 14 in the direction of approaching the thermal trip 302 until abutting against the limiting plate 20, so as to limit the excessive rotation of the rotating part 502.

[0054] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model, and do not limit the utility model to only the specific embodiments described. Obviously, according to the content of the specification, other modifications and changes can be made. The embodiments selected and described in the specification are to better explain the principle and practical application of the utility model, so that the persons skilled in the art can well understand and utilize the utility model, and are not a limitation of the utility model. Any simple modification of the utility model is within the protection scope of the utility model.

Claims

1. A surge protector comprising a pressure sensitive varistor, characterized by, The shell, a piezoresistance sheet, a first pin, a second pin and a heat dissipation mechanism are included. The shell is internally provided with a bearing frame, and the bearing frame is internally provided with a mounting plate, and the piezoresistance sheet is mounted on the first side of the mounting plate. The piezoresistance sheet is externally provided with a first electrode and a second electrode, and the external surface of the piezoresistance sheet is externally provided with an insulating heat conduction layer. The first pin is connected with the first electrode, the second pin is connected with the second electrode, and the first pin and the second pin are extended out of the shell for plugging. The heat dissipation mechanism includes a heat dissipation fin array arranged on one side of the piezoresistance sheet, one end of the heat dissipation fin array is abutted with the insulating heat conduction layer, the other end is connected with a heat conduction plate, the four edges of the heat conduction plate are horizontally extended along the direction close to the shell until abutting with the inner side of the shell, so that a heat conduction cavity is formed between the heat conduction plate and the shell, the heat conduction cavity is internally provided with heat conduction filler, and the shell is provided with a plurality of heat dissipation holes, and the heat dissipation holes are communicated with the heat conduction cavity.

2. The surge protector containing a pressure sensitive resistor according to claim 1, wherein The heat conduction filler is a heat conduction silica gel.

3. The surge protector containing a pressure sensitive resistor according to claim 1, wherein The heat conduction filler includes first heat conduction silica gel and second heat conduction silica gel, a sealed accommodating cavity is arranged between the first heat conduction silica gel and the second heat conduction silica gel, and phase change heat conduction material is arranged in the sealed accommodating cavity.

4. The surge protector containing a pressure sensitive resistor according to claim 1, wherein The heat dissipation fin array includes a plurality of first heat dissipation fins arranged in an array along the length direction of one side of the piezoresistance sheet, a second heat dissipation fin is arranged between adjacent first heat dissipation fins along the length direction of one side of the piezoresistance sheet, the height of the first heat dissipation fin is greater than the height of the second heat dissipation fin, and the first heat dissipation fin is abutted with the heat conduction plate.

5. The surge protector containing a pressure sensitive resistor according to claim 1, wherein The shell is provided with a plurality of transverse grooves and a U-shaped opening on both sides for plugging and unplugging the surge protector.

6. The surge protector containing a pressure sensitive resistor according to claim 1, wherein The heat conduction plate is made of aluminum-copper alloy.

7. The surge protector containing a pressure sensitive resistor according to claim 1, wherein The first pin includes a pin body and a thermal trip unit, and the thermal trip unit is respectively welded with the pin body and the first electrode through low-melting-point alloy.

8. A surge protector containing a pressure sensitive resistor according to claim 7, wherein The mounting plate is provided with mounting holes penetrating through both sides, and the bearing frame is provided with an installation groove communicated with the second electrode on one side, the first electrode passes through the mounting hole and is welded with the thermal trip unit, and the second electrode passes through the installation groove and is welded with one end of the second pin.

9. The surge protector containing a pressure sensitive resistor according to claim 7, wherein Further including a tripping mechanism, the tripping mechanism includes a rotating shaft arranged on the second side of the mounting plate and a rotating member; the shell is provided with an observation window on the top, and the bearing frame is provided with a fault state indicating area on the top; the fault state indicating area is opposite to the observation window; The rotating member is provided with a first end angle, a second end angle and a third end angle, the first end angle is rotatably installed on the rotating shaft, one end close to the shell is connected with an abutting rod, the second end angle is located on one side of the thermal trip unit, and the third end angle is located above the fault state indicating area, and the third end angle is opposite to one side of the observation window and is provided with a normal state indicating area; the normal state indicating area and the fault state indicating area are marked with different colors. The bottom of the shell is provided with an opening, when a surge protector is plugged into a socket, the abutting rod triggers the micro switch in the socket through the opening, the rotating member rotates around the rotating shaft so that the second end corner abuts against the thermal trip, and the normal state indication area is located directly below the observation window; After the thermal trip is unwelded, the rotating member continues to rotate around the rotating shaft and drives the abutting rod to be separated from the micro switch, and the third end corner is away from the observation window, so that the fault state indication area is located directly below the observation window.

10. The surge protector containing a pressure sensitive resistor according to claim 9, wherein A limiting plate is arranged on the mounting plate above the thermal trip, after the thermal trip is unwelded, the rotating member continues to rotate around the rotating shaft in the direction of approaching the thermal trip until abutting against the limiting plate.

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