Two-stage protection surge protection device module box and surge protection device

Abstract

The utility model provides a two-stage protection surge protection device module box, which comprises a shell, a first piezoresistor, a second piezoresistor, a thermal tripping piece, an impedance device, a first electric connecting piece, a second electric connecting piece and a third electric connecting piece, and is characterized in that the thermal tripping piece is electrically connected with the first electric connecting piece and the first piezoresistor through low-temperature tin soldering; the first electric connecting piece is electrically connected with the first piezoresistor, the second electric connecting piece is electrically connected with the second piezoresistor, the impedance device is electrically connected with the first piezoresistor and the second piezoresistor, the third electric connecting piece is electrically connected with the first piezoresistor and the second piezoresistor, the first electric connecting piece is an electric input end, the second electric connecting piece is an electric output end, and the third electric connecting piece is a grounding end. When the temperature of the first piezoresistor exceeds a low-temperature tin soldering fusing temperature threshold value, the thermal tripping piece is disconnected with the first piezoresistor and the first electric connecting piece. According to the two-stage protection surge protector module box provided by the utility model, the internal structure is exquisite and matched, the lightening and thinning of the surge protector module box are realized, and the occupation of the installation space is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lightning protection, in particular to a two-stage protection surge protector module box and a surge protector. Background Art

[0002] SPD is a surge protector, also called a lightning arrester. It is an electronic device that provides safety protection for various electronic equipment, instruments and meters, and communication lines. In a low-voltage power distribution system, when a spike current or voltage suddenly occurs in an electrical circuit or communication line due to external interference, the surge protector can conduct and shunt in a very short time, such as overvoltage caused by lightning, thereby avoiding damage to other equipment in the circuit caused by the surge. SPD surge protectors can discharge lightning currents and protect electrical equipment from lightning strikes. Surge protectors generally include a surge protector base and a surge protector module box that can be plugged into the surge protector base. Most of the existing surge protector module boxes are single-stage protection. The residual voltage after the surge is discharged by the surge protector is still high, and the electrical equipment in the circuit is still harmful. At present, there are also some two-stage protection surge protector module boxes that can attenuate surges step by step, but due to the large and complex internal structure, the size is mostly in the form of 3P, which occupies a large installation space, is inconvenient to install, and is not conducive to use in micro power supply circuits. Summary of the invention

[0003] In view of this, the utility model aims to provide a novel two-stage protection surge protector module box, which integrates the two-stage protection structure into a 1P form with small size, reduced space occupancy and convenient installation.

[0004] To achieve the purpose of the utility model, a two-stage protection surge protector module box is provided. The two-stage protection surge protector module box includes a shell, a first varistor, a second varistor, a thermal release, an impedance device, a first electrical connector, a second electrical connector and a third electrical connector. The first varistor, the second varistor, the thermal release and the impedance device are arranged in the shell. The thermal release electrically connects the first electrical connector and the first varistor through low-temperature soldering. The second electrical connector is electrically connected to the second varistor. The impedance device is electrically connected to the first varistor and the second varistor respectively. The third electrical connector electrically connects the first varistor and the second varistor. The first electrical connector is an electrical input terminal. The second electrical connector is an electrical output terminal. The third electrical connector is a ground terminal. When the temperature of the first varistor exceeds the low-temperature soldering melting temperature threshold, the thermal release is disconnected from the first varistor and the first electrical connector.

[0005] Optionally, the two-stage protection surge protector module box also includes an elastic return member and a remote signaling rod. The first end of the elastic return member is fixedly disposed in the housing, and the second end is connected to the first end of the thermal release member. The second end of the thermal release member is electrically connected to the first varistor and the first electrical connector through low-temperature soldering. The remote signaling rod is swingably disposed in the housing and overlaps the second end of the thermal release member. When the temperature of the varistor exceeds the low-temperature soldering melting temperature threshold, the elastic return member drives the thermal release member to move, and the remote signaling rod loses the overlapping fulcrum and thus swings.

[0006] Optionally, the remote signaling rod comprises a rotating shaft, a tail rod, an elastic support end and an overlap end. The rotating shaft is rotatably arranged in the shell. The elastic support end and the overlap end are the two ends of the remote signaling rod respectively. The elastic support end elastically abuts in the shell. The overlap end can swing with the rotating shaft as the axis. The overlap end overlaps the second end of the thermal release part. The tail rod extends outward through the shell and abuts against the external remote signaling circuit.

[0007] Optionally, a first electrode sheet is provided on the first varistor. A second electrode sheet is provided on the second varistor. The first electrode sheet is fixedly attached to the first surface of the varistor, and one end of the first electrode sheet extends out of the varistor and is bent to form a welding folded plate. A first through hole is provided on the welding folded plate. A second through hole is provided on the first electrical connector. The second end of the thermal release member passes through the first through hole and the second through hole in sequence. The second electrode sheet is fixedly attached to the first surface of the second varistor. The second electrical connector and the second electrode sheet are bent and formed integrally.

[0008] Optionally, the first electrical connector, the second electrical connector, and the third electrical connector are respectively fixedly disposed on the housing. A third electrode sheet is also disposed on the first varistor and the second varistor. The third electrode sheet is fixedly attached to the second surface of the first varistor and the second surface of the second varistor. The third electrode sheet is integrally bent and formed with the third electrical connector.

[0009] Optionally, the thermal release component includes an indicator sheet and a pin sheet. The pin sheet includes a pivot end and a terminal end, and the indicator sheet and the pivot end of the pin sheet are pivotally connected to each other. The pin sheet is sequentially inserted into the first through hole and the second through hole, and is electrically connected to the welding folding plate and the first electrical connector by low-temperature soldering. The overlapping end of the remote signal rod overlaps the terminal end of the pin sheet. The elastic return member is connected to the indicator sheet. A degradation indicator mark is provided on the indicator sheet. An indicator window is provided on the housing. When the elastic return member is reset to drive the thermal release component to move, the degradation indicator mark moves to a position corresponding to the indicator window.

[0010] Optionally, the two-stage protection surge protector module box also includes a cover. The cover is interlocked with the shell to accommodate the first varistor, the second varistor, the impedance device, the elastic recovery member and the thermal release member. The shell is also provided with a first array of protrusions. The inner side of the cover is provided with a second array of protrusions. The first surface of the first varistor and the first surface of the second varistor are in contact with the second protrusion. The second surface of the first varistor and the second surface of the second varistor are in contact with the first protrusion.

[0011] Optionally, a partition is further provided in the shell. The partition partitions the inner cavity of the shell into a first inner cavity and a second inner cavity. The first varistor, the second varistor and the impedance device are arranged in the first inner cavity. The thermal release member and the elastic return member are arranged in the second inner cavity. The partition is provided with a bending portion. The indicator sheet is made of a flexible material. The pin sheet is made of a metal material. When the elastic return member drives the pin sheet to move, the indicator sheet bends and moves in contact with the bending portion.

[0012] Optionally, the impedance device is one of a coil, a capacitor or a thermistor. A convex column is also provided in the housing. A hanging hole is provided at one end of the indicator sheet, the first end of the elastic recovery member is sleeved on the convex column, and the second end of the elastic recovery member is hung in the hanging hole of the indicator sheet. The initial state of the elastic recovery member is a stretched state.

[0013] The utility model also provides a surge protector. The surge protector comprises a surge protector base and the aforementioned two-stage protection surge protector module box. A remote signaling circuit is provided in the surge protector base. A micro switch is provided on the remote signaling circuit. The two-stage protection surge protector module box is pluggably connected to the surge protector base through the first electrical connector, the second electrical connector and the third electrical connector. The remote signaling rod of the two-stage protection surge protector module box abuts against the micro switch.

[0014] The utility model provides a two-stage protection surge protector module box, which realizes two-stage protection by setting an impedance device and two varistors, and gradually attenuates the surge, so that the residual voltage transmitted by the surge to the protected electrical equipment end is sufficiently low, thereby achieving the effect of better protecting the electrical equipment in the circuit. The two-stage protection surge protector module box provided by the utility model has a sophisticated internal structure and can be integrated into a 1P form, so that the two-stage protection surge protector module box is light and thin, and the installation space is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present utility model, rather than limiting the present utility model.

[0016] Figure 1 A schematic structural diagram of a surge protector provided in one embodiment of the utility model.

[0017] Figure 2 for Figure 1 A schematic diagram of the structure of the remote signal circuit board and the micro switch in the surge protector.

[0018] Figure 3 A schematic structural diagram of a two-stage protection surge protector module box provided in one embodiment of the utility model.

[0019] Figure 4 for Figure 3 Electrical schematic diagram of the two-stage protection surge protector module box.

[0020] Figure 5 for Figure 3 A schematic structural diagram of the cover body in the two-stage protection surge protector module box.

[0021] Figure 6 for Figure 3 A schematic diagram of the structure of the shell in the two-stage protection surge protector module box.

[0022] Figure 7 for Figure 3 A schematic diagram of the planar structure of the interior of the two-stage protection surge protector module box in one state.

[0023] Figure 8 for Figure 7 A schematic diagram of the three-dimensional structure inside the two-stage protection surge protector module box in the described state.

[0024] Fig. 9 for Figure 3 A schematic diagram of the planar structure of the interior of the two-stage protection surge protector module box in another state.

[0025] Fig.10 for Fig. 9 A schematic diagram of the three-dimensional structure inside the two-stage protection surge protector module box in the described state.

[0026] Fig.11 for Figure 3 A schematic structural diagram from one perspective of the first varistor, the second varistor, the impedance device, the second electrical connector, and the third electrical connector in the two-stage protection surge protector module box.

[0027] Fig.12 for Figure 3 A schematic structural diagram of the first varistor, the second varistor, the impedance device, the second electrical connector, and the third electrical connector in the two-stage protection surge protector module box from another perspective.

[0028] Fig.13 for Figure 3 A schematic diagram of the structure of the thermal release component in the two-stage protection surge protector module box.

[0029] Fig.14 for Figure 3 A schematic diagram of the structure of the remote signaling rod in the two-stage protection surge protector module box.

[0030] Fig.15 for Figure 3 A plan view of the two-stage protection surge protector module box in one state.

[0031] Fig.16 for Fig.15 A cross-sectional view of the two-stage protection surge protector module box along line AA.

[0032] Fig.17 for Figure 3 A plan view of the two-stage protection surge protector module box in another state.

[0033] Fig.18 for Fig.17 A cross-sectional view of the two-stage protection surge protector module box along line A'-A'. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the utility model.

[0035] See also Figure 1-2, a surge protector 999 is provided in one embodiment of the utility model. The surge protector 999 includes a surge protector base 998 and a two-stage protection surge protector module box 997 provided in one embodiment of the utility model. A remote signal circuit board 9981 is provided in the surge protector base 998, and a micro switch 9982 is provided on the remote signal circuit board 9981, and the micro switch 9982 is electrically connected to an external power supply. The two-stage protection surge protector module box 997 can be plugged into the surge protector base 998 and abut against the micro switch 9982. The surge protector 999 discharges current to the ground when a lightning strike or a system overvoltage occurs to protect the electrical appliances in the circuit. The two-stage protection surge protector module box 997 provided in the embodiment of the utility model has a single-pole width of 9mm±0.5mm, or a single-pole width of 12mm±0.5mm, and is small in size, which can reduce the space occupied by the installation.

[0036] See also Figure 2-7 The two-stage protection surge protector module box 997 includes a cover 110, a shell 120, an elastic recovery member 200, a first varistor 310, a second varistor 320, an impedance device 400, a thermal release member 500, a remote signal rod 600, a first electrical connector 700, a second electrical connector 800 and a third electrical connector 900. The cover 110 and the shell 120 are mutually buckled to accommodate the elastic recovery member 200, the first varistor 310, the second varistor 320, the impedance device 400 and the thermal release member 500. The first end 210 of the elastic recovery member 200 is fixedly arranged in the shell 120, and the second end 220 of the elastic recovery member 200 is connected to the first end 501 of the thermal release member 500. The initial state of the elastic recovery member 200 is a stretched state. The second end 502 of the thermal release member 500 is inserted into the first electrical connector 700. The remote signal rod 600 is swingably disposed in the housing 120 and overlaps with the second end 502 of the thermal release member 500. One end of the remote signal rod 600 extends outward through the housing 120 and abuts against the micro switch 9982 on the remote signal circuit board 9981 in the surge protector base 998. The first electrical connector 700, the second electrical connector 800 and the third electrical connector 900 are fixedly disposed on the housing 120 and are located below the first varistor 310 and the second varistor 320. The two-stage protection surge protector module box 997 is pluggably connected to the surge protector base 998 through the first electrical connector 700, the second electrical connector 800 and the third electrical connector 900. The first electrical connector 700 is an electrical input terminal, the second electrical connector 800 is an electrical output terminal, and the third electrical connector 900 is a ground terminal. The thermal release member 500 is electrically connected to the first varistor 310 and the first electrical connector 700 respectively by low temperature soldering. Figure 7 As shown, points A and B are two low-temperature soldering points. Figure 4Electrical schematic diagram, when lightning strikes or system overvoltage occurs, the temperature of the first varistor 310 and the second varistor 320 rises. When the temperature of the first varistor 310 exceeds the low-temperature solder melting temperature threshold, the low-temperature tin melts, the thermal release component 500 is disconnected from the first varistor 400 and the first electrical connector 700, the elastic recovery component 200 is reset, driving the thermal release component 500 to move, the thermal release component 500 is pulled out of the first electrical connector 700, and the remote signal rod 600 loses the lap fulcrum and swings, so that the remote signal rod 500 is disconnected from the micro switch 9982, and a remote signal alarm signal is issued. After receiving the alarm signal, the user can promptly handle the surge protector 999. In this embodiment, the elastic recovery component 200 is a tension spring.

[0037] See also Figure 5-7 , the inner side surface 1101 of the cover body 110 is provided with second protrusions 111 arranged in an array. The second protrusions 111 are used to support and abut the first varistor 310 and the second varistor 320, so as to facilitate the heat dissipation of the first varistor 310 and the second varistor 320. The shell 120 is a rectangular parallelepiped structure with an opening, which is interlocked with the cover body 110, and the elastic recovery member 200, the first varistor 310, the second varistor 320, the impedance device 400, and the thermal release member 500 are accommodated therein. The shell 120 is provided with a convex column 121, a partition 122 and a first protrusion 123. The convex column 121 extends from the inner side surface 1201 of the shell 120 toward the cover body 110. The first end 210 of the elastic recovery member 200 is sleeved on the convex column 121. The partition 122 extends from the inner side surface 1201 of the shell 120 toward the cover body 110, and divides the inner cavity of the shell into a first inner cavity 124 and a second inner cavity 125. The first varistor 310, the second varistor 320 and the impedance device 400 are arranged in the first inner cavity 124. The elastic recovery member 200 and the thermal release member 500 are arranged in the second inner cavity 125. The partition 122 is provided with a bending portion 1221. The first protrusions 123 are arranged in an array in the first inner cavity 124 of the shell 120, and are used to support and abut the first varistor 310 and the second varistor 320, so as to facilitate the heat dissipation of the first varistor 310 and the second varistor 320. The upper side of the shell 120 is also provided with an indication window 126. The shell 120 is also provided with a remote signal rod mounting hole 127. The remote signal rod 600 is rotatably mounted in the remote signal rod mounting hole 127.

[0038] See also Figure 7-8 , Figure 11-12, a first electrode sheet 311 is provided on the first varistor 310. The first electrode sheet 311 is fixedly attached to the first surface 401 of the varistor 400, and one end extends out of the varistor 400 and is bent to form a welding folded plate 3111. A first through hole 3112 is provided on the welding folded plate 3111. A second through hole 710 is provided on the first electrical connector 700. The second end 520 of the thermal release member 500 passes through the first through hole 3112 and the second through hole 710 in sequence, and is electrically connected to the welding folded plate 3111 and the first electrical connector 700 by low-temperature soldering. A second electrode sheet 321 is provided on the second varistor 320. The second electrode sheet 321 is fixedly attached to the first surface 3201 of the second varistor 320. The second electrical connector 800 is integrally bent and formed with the second electrode sheet 321. A third electrode sheet 330 is also provided on the first varistor 310 and the second varistor 320. The third electrode sheet 330 is fixedly attached to the second surface 3102 of the first varistor 310 and the second surface 3202 of the second varistor 320. The third electrode sheet 330 and the third electrical connector 900 are integrally bent and formed. The impedance device 400 is arranged between the first varistor 310 and the second varistor 320, and is electrically connected to the first electrode sheet 311 and the second electrode sheet 321. The impedance device 400 is one of a coil, a capacitor or a thermistor. The impedance device 400 is used to block and limit the transmission of the surge to the next level, thereby reducing the residual pressure of the surge at the end of the protected electrical equipment and better protecting the electrical equipment. In this embodiment, the first varistor 310, the second varistor 320, the first electrode sheet 311, the second electrode sheet 321, the impedance device 400, the second electrical connector 800 and the third electrical connector 900 are integrally packaged.

[0039] Combined with reference Figure 5-6 and Figure 11-12 The first surface 3101 of the first varistor 310 and the first surface 3201 of the second varistor 320 abut against the second protrusion 111 in the cover 110, and the second surface 3102 of the first varistor 310 and the second surface 3202 of the second varistor 320 abut against the first protrusion 123 in the housing 120. The first protrusion 123 and the second protrusion 111 support the first varistor 310 and the second varistor 320, so as to facilitate heat dissipation of the first varistor 310 and the second varistor 320.

[0040] See also Figure 7-8 , Fig.13The thermal release member 500 includes an indicator sheet 510 and a pin sheet 520. The indicator sheet 510 and the pin sheet 520 are pivotally connected to each other. A hanging hole 511 is provided at one end of the indicator sheet 510, and a pivot shaft 512 is provided at the other end. The second end 220 of the elastic recovery member 200 is hung in the hanging hole 511 of the indicator sheet 510. The pin sheet 520 includes a pivot end 521 and a terminal end 522. A pivot hole 5211 is provided on the pivot end 521, and the pivot hole 5211 and the pivot shaft 512 on the indicator sheet 510 are pivotally connected to each other. A degradation indicator mark 513 is provided on the indicator sheet 510. The indicator sheet 510 is made of a flexible material, and specifically can be made of Teflon or PEEK. After the low-temperature tin melts, the elastic recovery member 200 drives the thermal release member 500 to move, the indicator sheet 510 is bent and moved in the bending portion 1221 of the partition 122, and the degradation indicator 513 moves to a position corresponding to the indicator window 126. The user can observe the current state of the two-stage protection surge protector module box 997 through the indicator window 126. The pin sheet 520 is made of metal, specifically brass, copper, copper-clad steel, etc. The pin sheet 520 is sequentially inserted into the first through hole 3112 of the welding folding plate 3111 and the second through hole 710 of the first electrical connector 700, and is electrically connected to the welding folding plate 3111 and the first electrical connector 700 through low-temperature soldering. In this embodiment, a color different from other parts can be set on the degradation indicator 513, so that the user can judge the current state of the two-stage protection surge protector module box 997 by the color observed in the indicator window 126. In other embodiments, other methods can also be used to achieve the indication function.

[0041] See also Figure 7 , Fig. 9 , Figure 14-18, the remote signaling rod 600 includes a rotating shaft 610, a tail rod 620, an elastic support end 630 and an overlap end 640. The rotating shaft 610 is rotatably arranged in the housing 120. Specifically, the rotating shaft 610 is rotatably arranged in the remote signaling rod mounting hole 127 in the housing 120. The elastic support end 630 and the overlap end 640 are respectively the two ends of the remote signaling rod 600. The rotating shaft 610 is arranged near the elastic support end 630. The elastic support end 630 elastically abuts against the inner side surface 1201 of the housing 120, and the overlap end 640 can swing around the rotating shaft 610. The overlap end 640 overlaps the end 522 of the pin piece 520. The tail rod 620 passes through the housing 120 and extends outward, and abuts against the external remote signaling circuit. In this embodiment, the external remote signaling circuit is a circuit composed of the remote signaling circuit board 9981 and the micro switch 9982 in the surge protector base 998. Specifically, the tail rod 620 abuts against the elastic pressure plate 9983 of the micro switch 9982. When the temperature of the first varistor 310 exceeds the low-temperature solder melting temperature threshold, the low-temperature solder melts, the elastic recovery member 200 resets, drives the indicator piece 510 and the pin piece 520 to move, and the lap end 640 of the remote signal rod 600 loses the lap fulcrum and swings, driving the tail rod 620 to deviate, so that the tail rod 620 is disconnected from the micro switch 9982, and a remote signal alarm signal is issued. After receiving the alarm signal, the user can deal with the surge protector 999 in time.

[0042] See also Figure 8 , Fig.10 and Figure 11-12 , the third electrical connector 900 is arranged between the first electrical connector 700 and the second electrical connector 800. The first electrical connector 700 is fixedly arranged on the housing 120. The first electrical connector 700 includes a second through hole 710, a first welding end 720 and a first plug-in end 730. The first welding end 720 is fixedly arranged in the housing 120. The second through hole 710 is arranged on the first welding end 720. The pin piece 520 passes through the second through hole 710 and is connected to the first welding end 720 by low-temperature soldering. The first plug-in end 730 vertically passes through the housing 120 and extends outward, and can be plugged into the two-stage protection surge protector module box base 998 to achieve electrical connection with an external power supply.

[0043] See also Figure 8 , Fig.10 and Figure 11-12 , the second electrical connector 800 is integrally bent with the second electrode sheet 321. The second electrical connector 800 vertically passes through the housing 120 and extends outward, and can be plugged into the two-stage protection surge protector module box base 998 to achieve electrical connection with an external power supply. The third electrical connector 900 is integrally bent with the third electrode sheet 330. The third electrical connector 900 vertically passes through the housing 120 and extends outward, and can be plugged into the two-stage protection surge protector module box base 998 to achieve current grounding discharge.

[0044] See also Figure 7-8 , a schematic diagram of the internal structure of the two-stage protection surge protector module box under normal working conditions, when the circuit current is stable, the first electrical connector 700 is electrically connected to the first electrode sheet 311, the second electrical connector 800 is electrically connected to the second electrode sheet 321, the third electrical connector 900 is electrically connected to the third electrode sheet 330, the pin sheet 520 is connected to the first electrode sheet 311 and the first electrical connector 700 by low-temperature soldering, the overlapping end 640 of the remote signal rod 600 is overlapped with the end 522 of the pin sheet 520, the tail rod 620 is in contact with the micro switch 9982 on the remote signal circuit board 9981, and the circuit is normally turned on. At this time, the degradation indicator 513 is not displayed at the indicator window 126, and the two-stage protection surge protector module box 997 is in normal state.

[0045] See also Figure 9-10 , a schematic diagram of the structure of the internal structure of the two-stage protection surge protector module box in a degraded state, when the temperature of the first varistor 310 and the second varistor 320 exceeds the low-temperature soldering melting temperature threshold, the pin piece 520 is disconnected from the first electrode piece 311 and the first electrical connector 700, the elastic recovery member 200 is reset to drive the indicator piece 510 and the pin piece 520 to move, the degradation indicator 513 moves to a position corresponding to the indicator window 126, and the display state is degraded. The user can lock the circuit degraded two-stage protection surge protector module box 997 by observing the indicator window 126, the pin piece 520 moves, the overlapping end 640 of the remote signal rod 600 loses the overlapping fulcrum and swings, thereby driving the tail rod 620 to deviate and leave the micro switch 9982, sending a remote signal alarm signal, and the user can receive the alarm signal remotely.

[0046] The utility model provides a two-stage protection surge protector module box, which realizes two-stage protection by setting an impedance device and two varistors, and gradually attenuates the surge, so that the residual voltage transmitted by the surge to the protected electrical equipment end is sufficiently low, thereby achieving the effect of better protecting the electrical equipment in the circuit. The two-stage protection surge protector module box provided by the utility model has a sophisticated internal structure and can be integrated into a 1P form, so that the two-stage protection surge protector module box is light and thin, and the installation space is reduced.

[0047] Although the description and illustration of the relevant embodiments of the present invention have been given, those skilled in the art should understand that the description and illustration of these embodiments do not constitute a limitation on the scope of the present invention, and the present invention can be transformed in various forms and details without exceeding the concept and scope of the present invention. Therefore, the scope of the present invention is not limited to the above embodiments, but should be determined by the claims and the equivalents of the claims.

Claims

1. A two-stage protection surge protector module box, characterized in that: The two-stage protection surge protector module box includes a shell, a first varistor, a second varistor, a thermal release, an impedance device, a first electrical connector, a second electrical connector and a third electrical connector. The first varistor, the second varistor, the thermal release and the impedance device are arranged in the shell. The thermal release device electrically connects the first electrical connector and the first varistor through low-temperature soldering, and the second electrical connector is electrically connected to the second varistor. The impedance device is electrically connected to the first varistor and the second varistor respectively. The third electrical connector is electrically connected to the first varistor and the second varistor. The first electrical connector is an electrical input end, the second electrical connector is an electrical output end, and the third electrical connector is a ground end. When the temperature of the first varistor exceeds the low-temperature soldering melting temperature threshold, the thermal release device is disconnected from the first varistor and the first electrical connector.

2. A two-stage surge protector module box as claimed in claim 1, characterized in that: The two-stage protection surge protector module box also includes an elastic return member and a remote signaling rod. The first end of the elastic return member is fixedly arranged in the shell, and the second end is connected to the first end of the thermal release member. The second end of the thermal release member is electrically connected to the first varistor and the first electrical connector through low-temperature soldering. The remote signaling rod is swingably arranged in the shell and overlaps the second end of the thermal release member. When the temperature of the varistor exceeds the low-temperature soldering melting temperature threshold, the elastic return member drives the thermal release member to move, and the remote signaling rod loses the overlap fulcrum and swings.

3. A two-stage protection surge protector module box as claimed in claim 2, characterized in that: The remote signaling rod includes a rotating shaft, a tail rod, an elastic supporting end and a lap end. The rotating shaft is rotatably arranged in the shell. The elastic supporting end and the lap end are respectively the two ends of the remote signaling rod. The elastic supporting end elastically abuts in the shell. The lap end can swing with the rotating shaft as the axis. The lap end is overlapped with the second end of the thermal release component. The tail rod extends outward through the shell and abuts against the external remote signaling circuit.

4. A two-stage surge protector module box as claimed in claim 3, characterized in that: A first electrode sheet is provided on the first varistor, and a second electrode sheet is provided on the second varistor. The first electrode sheet is fixedly attached to the first surface of the varistor, and one end of the first electrode sheet extends out of the varistor and is bent to form a welding folded plate. A first through hole is provided on the welding folded plate, and a second through hole is provided on the first electrical connector. The second end of the thermal release component passes through the first through hole and the second through hole in sequence. The second electrode sheet is fixedly attached to the first surface of the second varistor, and the second electrical connector and the second electrode sheet are bent into an integral body.

5. A two-stage protection surge protector module box as claimed in claim 4, characterized in that: The first electrical connector, the second electrical connector, and the third electrical connector are respectively fixedly arranged on the shell, and the first varistor and the second varistor are also provided with a third electrode sheet, the third electrode sheet is fixedly attached to the second surface of the first varistor and the second surface of the second varistor, and the third electrode sheet and the third electrical connector are bent into an integral body.

6. A two-stage protection surge protector module box as claimed in claim 5, characterized in that: The thermal release component includes an indicator piece and a pin piece, the pin piece includes a pivot end and a terminal end, the indicator piece and the pivot end of the pin piece are pivotally connected to each other, the pin piece is sequentially inserted into the first through hole and the second through hole, and is electrically connected to the welding folding plate and the first electrical connector through low-temperature soldering, the overlapping end of the remote signal rod is overlapped at the terminal end of the pin piece, the elastic return piece is connected to the indicator piece, a degradation indicator mark is provided on the indicator piece, an indicator window is provided on the shell, and when the elastic return piece is reset to drive the thermal release component to move, the degradation indicator mark moves to a position corresponding to the indicator window.

7. A two-stage protection surge protector module box as claimed in claim 6, characterized in that: The two-stage protection surge protector module box also includes a cover body, which is buckled with the shell to accommodate the first varistor, the second varistor, the impedance device, the elastic recovery member and the thermal release member. The shell is also provided with first protrusions arranged in an array, and the inner side surface of the cover body is provided with second protrusions arranged in an array. The first surface of the first varistor and the first surface of the second varistor are in contact with the second protrusions, and the second surface of the first varistor and the second surface of the second varistor are in contact with the first protrusions.

8. A two-stage protection surge protector module box as claimed in claim 7, characterized in that: A partition is also provided in the shell, and the partition divides the inner cavity of the shell into a first inner cavity and a second inner cavity. The first varistor, the second varistor and the impedance device are arranged in the first inner cavity, and the thermal release component and the elastic return component are arranged in the second inner cavity. The partition is provided with a bending portion, the indicator sheet is made of a flexible material, and the pin sheet is made of a metal material. When the elastic return component drives the pin sheet to move, the indicator sheet is bent and moves in contact with the bending portion.

9. A two-stage protection surge protector module box as claimed in claim 8, characterized in that: The impedance device is one of a coil, a capacitor or a thermistor. A convex column is also provided in the shell. A hanging hole is provided at one end of the indicator sheet. The first end of the elastic recovery member is sleeved on the convex column, and the second end of the elastic recovery member is hung in the hanging hole of the indicator sheet. The initial state of the elastic recovery member is a stretched state.

10. A surge protector, characterized in that: The surge protector includes a surge protector base and a two-stage protection surge protector module box as described in any one of claims 1 to 9, a remote signaling circuit is provided in the surge protector base, a micro switch is provided on the remote signaling circuit, the two-stage protection surge protector module box is pluggably connected to the surge protector base through the first electrical connector, the second electrical connector and the third electrical connector, and the remote signaling rod of the two-stage protection surge protector module box abuts against the micro switch.

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