Surge protection device

Abstract

The utility model belongs to the technical field of electrical equipment, and provides a surge protection device. Comprising an inner shell, a graphite gap assembly, a piezoresistor, a voltage-sensitive electrode, a first external electrode, a second external electrode, a tripping assembly and an arc extinguishing plate, the tripping assembly comprises a tripping elastic piece and an elastic assembly, and the graphite gap assembly, the piezoresistor and the voltage-sensitive electrode are arranged in the inner shell; one end of the graphite gap assembly is connected with the other end of the second external electrode, the other end of the graphite gap assembly is connected with the pressure-sensitive electrode through the pressure-sensitive resistor, one end of the tripping elastic piece is connected with the other end of the first external electrode, the other end of the tripping elastic piece is connected with the pressure-sensitive electrode, and the arc extinguishing plate is arranged between the tripping elastic piece and the inner shell. One end of the elastic component is connected with the inner shell, and the other end is connected with the arc extinguishing plate; and the elastic assembly is used for triggering the arc extinguishing plate to cut off the connection between the pressure-sensitive electrode and the tripping elastic sheet. The device not only has a transient induction lightning protection function, but also has a failure tripping function, and can effectively slow down the performance degradation of a voltage limiting device.

Description

Technical Field

[0001] The present application belongs to the technical field of electrical equipment, and in particular relates to a surge protection device. Background Art

[0002] A surge protector is a protective device that provides safety protection for various electronic equipment, instruments and meters, and communication lines. When an electrical circuit or communication line is damaged by lightning or other transient overvoltage, the surge protector can cut off the power supply in time to protect the back-end equipment.

[0003] Surge protectors include voltage-limiting surge protectors and switching surge protectors. Voltage-limiting surge protectors can only limit lightning currents and voltages that are smaller than their own. If there are parameters higher than or equal to the limit, the voltage-limiting components will be at risk of failure, causing damage to the subsequent equipment and resulting in losses. Utility Model Content

[0004] In view of this, an embodiment of the present application provides a surge protection device. By connecting a varistor in series with a graphite gap component, the surge protector has the characteristics of both a voltage-limiting surge protector and a switching surge protector. It has both transient induced lightning protection function and failure tripping function, and can greatly reduce the parameter requirements for the voltage-limiting device and effectively slow down the performance degradation of the voltage-limiting device.

[0005] A first aspect of an embodiment of the present application provides a surge protection device, comprising an inner housing, a graphite gap assembly, a varistor, a varistor electrode, a first external electrode, a second external electrode, a trip assembly, and an arc-extinguishing plate, wherein the trip assembly comprises a trip spring and an elastic assembly, the graphite gap assembly, the varistor, and the varistor electrode being arranged in the inner housing, one end of the first external electrode and one end of the second external electrode forming a connection terminal of the surge protection device, one end of the graphite gap assembly being connected to the other end of the second external electrode, and the other end being connected to the varistor electrode via the varistor, one end of the trip spring being connected to the other end of the first external electrode, and the other end being connected to the varistor electrode, the arc-extinguishing plate being arranged between the trip spring and the inner housing, one end of the elastic assembly being connected to the inner housing, and the other end being connected to the arc-extinguishing plate;

[0006] The elastic component is used to trigger the arc extinguishing plate to cut off the connection between the pressure-sensitive electrode and the tripping spring.

[0007] In one embodiment, the trip assembly further includes a solder having conductive properties and melting when the temperature reaches a thermal melting point, and the pressure-sensitive electrode and the trip spring are connected via the solder.

[0008] In one embodiment, the inner shell is provided with a through hole, and a welding platform is provided at a position corresponding to the pressure-sensitive electrode and the through hole, the trip spring and the pressure-sensitive electrode are interconnected at the welding platform, and the side of the welding platform away from the elastic component forms a limit interval of the arc extinguishing plate, and the arc extinguishing plate is arranged in the limit interval.

[0009] In one embodiment, the inner shell is further provided with a pair of warning electrodes which abut against each other under the action of the arc extinguishing plate and separate from each other when the arc extinguishing plate leaves the limit interval.

[0010] In one embodiment, the inner shell is provided with a limiting plate on a side of the welding platform close to the elastic member for limiting cooperation with the arc extinguishing plate.

[0011] In one embodiment, the arc-extinguishing plate is connected to the inner housing in a sliding manner, and the sliding direction of the arc-extinguishing plate is consistent with the direction of the elastic restoring force of the elastic component.

[0012] In one embodiment, the arc extinguishing plate is provided with a first indicator label and a second indicator label, and the first indicator label and the second indicator label are sequentially arranged along the direction of the elastic restoring force of the elastic component.

[0013] In one embodiment, an outer shell is further included, and the outer shell cover is arranged on the outside of the inner shell. A perspective window is provided on the outer shell. When the arc extinguishing plate is located in the limit interval, the first indicator label corresponds to the perspective window. When the arc extinguishing plate is limited and matched with the limit plate, the second indicator label corresponds to the perspective window.

[0014] In one embodiment, the graphite gap assembly includes a bracket and a plurality of electrode sheets and a plurality of insulating spacers arranged between the brackets, the electrode sheets and the insulating spacers are arranged alternately, one of the two electrode sheets located on the outside is connected to the other end of the second external electrode, and the other is connected to the varistor.

[0015] In one embodiment, the inner shell further includes a circuit board, soldering pins and a capacitor arranged in the inner shell, wherein the capacitor is arranged on the circuit board and connected to the electrode sheet and the second external electrode through the soldering pins.

[0016] The surge protection device provided in the first aspect of the embodiment of the present application is provided by providing an inner shell, a graphite gap component, a varistor, a varistor electrode, a first external electrode, a second external electrode, a tripping component and an arc-extinguishing plate, wherein the tripping component includes a tripping spring and an elastic component, the graphite gap component, the varistor and the varistor electrode are arranged in the inner shell, one end of the first external electrode and the second external electrode form a connection terminal of the surge protection device, one end of the graphite gap component is connected to the other end of the second external electrode, and the other end is connected to the varistor electrode through the varistor, one end of the tripping spring is connected to the other end of the first external electrode, and the other end is connected to the varistor electrode, the arc-extinguishing plate is arranged between the tripping spring and the inner shell, one end of the elastic component is connected to the inner shell, and the other end is connected to the arc-extinguishing plate; the elastic component is used to trigger the arc-extinguishing plate to cut off the connection between the varistor and the tripping spring. The surge protector has the characteristics of both a voltage-limiting surge protector and a switching surge protector. While having the transient induced lightning protection function, it can extinguish the arc through failure tripping. By connecting the varistor in series with the graphite gap component, the parameter requirements for the voltage-limiting device can be greatly reduced, and the degradation of the performance of the voltage-limiting device can be effectively slowed down. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 This is a schematic structural diagram of a surge protection device provided in one embodiment of the present application;

[0019] Figure 2 1 is a schematic structural diagram of a surge protection device provided in another embodiment of the present application;

[0020] Figure 3 1 is a schematic structural diagram of a surge protection device provided in another embodiment of the present application;

[0021] Figure 4 1 is a schematic structural diagram of a surge protection device provided in another embodiment of the present application;

[0022] Figure 5 1 is a schematic structural diagram of a surge protection device provided in another embodiment of the present application;

[0023] Figure 6 This is a schematic diagram of electrical connections of a surge protection device provided in one embodiment of the present application.

[0024] Among them, the reference numerals in the figures are:

[0025] 1-Inner shell, 101-External electrode assembly slot, 102-Limiting plate, 103-Alarm electrode assembly slot, 2-Graphite gap assembly, 201-Electrode sheet, 202-Insulating spacer, 203-Bracket, 3-Varistor, 4-Varistor electrode, 401-Soldering station, 5-First external electrode, 6-Second external electrode, 7-Trip assembly, 701-Trip spring, 702-Elastic member, 8-Arc extinguishing plate, 801-First indication label, 802-Second indication label, 9-Alarm electrode, 10-Module cover, 11-Circuit board, 12-Capacitor, 13-Welding pin, 14-Screw, 15-Outer shell, 151-Perspective window DETAILED DESCRIPTION

[0026] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0027] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0028] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may 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 may be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0030] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0031] References to "one embodiment" or "some embodiments" in the present specification mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized. "Multiple" means two or more.

[0032] like Figure 1 As shown, a surge protection device provided by an embodiment of the present application includes an inner shell 1, a graphite gap component 2, a varistor 3, a varistor electrode 4, a first external electrode 5, a second external electrode 6, a tripping component 7 and an arc extinguishing plate 8, the tripping component 7 includes a tripping spring 701 and an elastic member 702, the graphite gap component 2, the varistor 3 and the varistor electrode 4 are arranged in the inner shell 1, one end of the first external electrode 5 and the second external electrode 6 form a wiring terminal of the surge protection device, one end of the graphite gap component 2 is connected to the other end of the second external electrode 6, and the other end is connected to the varistor 3 through the varistor 4, one end of the tripping spring 701 is connected to the other end of the first external electrode 5, and the other end is connected to the varistor 4, the arc extinguishing plate 8 is arranged between the tripping spring 701 and the inner shell 1, one end of the elastic member 702 is connected to the inner shell 1, and the other end is connected to the arc extinguishing plate 8, and the elastic member 702 is used to trigger the arc extinguishing plate 8 to cut off the connection between the varistor 4 and the tripping spring 701.

[0033] In use, the inner housing houses the graphite gap assembly 2, varistor 3, and varistor electrode 4, and also secures the first and second external electrodes 5, 6, trip assembly 7, and arc-extinguishing plate 8. The first and second external electrodes 5, 6 are secured to the inner housing, with one end of each protruding from the surge protector, forming a terminal block for connecting to the circuit. The graphite gap assembly 2 and varistor 3 are in close contact, forming a series connection. The first external electrode 5 is connected to the second external electrode 6 through the graphite gap assembly 2 and varistor 3, effectively protecting against overvoltage events. The graphite gap assembly 2 maintains a high impedance state under normal operating voltage, but rapidly transitions to a low impedance state under overvoltage conditions, allowing overcurrent to flow. The varistor 3 acts as a voltage limiter, clamping overvoltages to a low level. The first and second external electrodes 5, 6 are connected in series through the graphite gap assembly 2 and varistor 3, forming a protective circuit. When the surge protector is connected in parallel, it effectively protects downstream equipment from overvoltages. The tripping spring 701 in the tripping assembly 7 is connected to the first external electrode 5 and the varistor electrode 4, and the coordinated use of the arc extinguishing plate 8 and the elastic member 702 ensures that when the current and / or voltage in the surge protection device reaches a certain threshold, the arc extinguishing plate 8 can be triggered to cut off the connection between the varistor electrode 4 and the tripping spring 701, thereby achieving tripping and arc extinguishing, and ensuring the safety and reliability of the surge protection device.

[0034] In application, the varistor 3 and the varistor electrode 4 are integrated.

[0035] In application, the graphite gap assembly 2 is a switch-type component, and the varistor 3 is a voltage-limiting component. The graphite gap assembly 2 is used for when the potential difference between the two electrodes reaches a certain level, the charge will pass through the two angular spaces to ignite and discharge, thereby releasing the overcurrent into the ground without worrying about the problem of power frequency continuous current. The varistor 3 has a very high impedance when there is no surge. As the surge current and voltage increase, its impedance decreases continuously, forming a lightning discharge channel. When the voltage is reduced to the operating voltage, the leakage current of the varistor decreases rapidly and returns to its original state. The embodiment of the present application realizes the series connection of the varistor and the graphite gap assembly in the surge protection device. Since the parasitic capacitance of the graphite gap assembly is very small, in this series combination branch, the graphite gap assembly plays a switch role. When there is no transient overvoltage, it can isolate the varistor from the system, so that there is almost no leakage current in the varistor, thereby reducing the threshold voltage of the varistor, without having to take into account the increase in leakage current caused by this. Therefore, it can more effectively slow down the decline of the varistor performance. During transient overvoltage conditions, since the threshold voltage of the varistor can be selected to be low, as long as the graphite gap assembly can quickly discharge and conduct, the series branch can provide a lower clamping voltage than a single varistor. Therefore, the surge protector of the embodiment of the present application combines the characteristics of a voltage-limiting surge protector and a switching surge protector. While providing transient induced lightning protection, it can extinguish arcs through failure tripping. Furthermore, by connecting the varistor in series with the graphite gap assembly, the parameter requirements for the voltage-limiting device can be significantly reduced, effectively mitigating the degradation of the voltage-limiting device's performance.

[0036] In one embodiment, a side wall of the inner shell 1 is provided with an external electrode assembly groove 101 , the first external electrode 5 is embedded in the external electrode assembly groove 101 , and one end of the first external electrode 5 protrudes from the surface of the inner shell 1 .

[0037] In use, multiple protrusions are provided on a side wall of the inner housing 1, thereby forming an area between the protrusions for defining the first external electrode 5, namely the external electrode assembly groove 101. The external electrode assembly groove 101 provided on a side wall of the inner housing 1 is used to secure the first external electrode 5, ensuring its accurate and stable position. This design helps simplify the assembly process and also facilitates subsequent electrical connections. The multiple protrusions provided on a side wall of the inner housing 1 help position the first external electrode 5 and ensure its secure installation, preventing movement during transportation or use.

[0038] In one embodiment, before the connection between the piezoresistive electrode 4 and the tripping spring 701 is disconnected, the elastic member 702 has an elastic restoring force that tends to move the arc-extinguishing plate 8 from one side of the connection point between the piezoresistive electrode 4 and the tripping spring 701 to the other side. The elastic member 702 can be any elastic element having an elastic restoring force exhibiting the above tendency, such as a spring in a stretched state.

[0039] In use, the design of the elastic member 702 ensures that it always maintains a certain elastic restoring force before the connection between the pressure-sensitive electrode 4 and the tripping spring 701 is disconnected. This allows the connection between the pressure-sensitive electrode 4 and the tripping spring 701 to be quickly severed when needed, achieving the tripping and arc extinguishing functions and improving the response speed of the surge protection device.

[0040] In one embodiment, the arc extinguishing plate 8 is provided with a first indicator label 801 and a second indicator label 802 , and the first indicator label 801 and the second indicator label 802 are sequentially arranged along the direction of the elastic restoring force of the elastic member 702 .

[0041] In application, the first indicator label 801 and the second indicator label 802 are used to indicate different states of the surge protection device. For example, the first indicator label 801 and the second indicator label 802 are used to indicate before and after the surge protection device is tripped, respectively, so that the working state of the surge protection device can be intuitively displayed to the outside world, making it easier for staff to take corresponding measures. The first indicator label 801 and the second indicator label 802 can be distinguished by graphics, text, color, etc. The first indicator label 801 and the second indicator label 802 are arranged in sequence along the direction of the elastic restoring force of the elastic member 702, so that when the elastic restoring force drives the arc extinguishing plate 8 to move, the correspondence between a certain position of the inner shell and the indicator label will switch from pointing to the first indicator label 801 to pointing to the second indicator label 802, thereby realizing the switching of the indication state.

[0042] In one embodiment, the trip assembly 7 further includes solder having conductive properties and melting when the temperature reaches a thermal melting point, and the pressure-sensitive electrode 4 and the trip spring 701 are connected via the solder.

[0043] In application, the solder has good electrical and thermal conductivity and can melt at a specific temperature. The solder can be lead-free solder (Sn-Ag-Cu), tin-lead solder (Sn63Pb37), silver solder (Ag-Cu-Zn), etc. Since the solder can melt after the temperature reaches the thermal melting point, when the temperature of the connection point between the pressure-sensitive electrode 4 and the tripping spring 701 reaches the thermal melting point of the solder, the connection force between the two will be insufficient to counteract the elastic restoring force of the elastic component, so that the elastic restoring force of the elastic component can trigger the arc extinguishing plate to move in the direction of the elastic restoring force, cut off the solder, and disconnect the connection between the pressure-sensitive electrode 4 and the tripping spring 701, thereby achieving tripping and arc extinguishing.

[0044] In one embodiment, Figure 2 As shown, the inner shell 1 is provided with a through hole, and a welding base 401 is provided at the position corresponding to the pressure-sensitive electrode 4 and the through hole. The trip spring 701 and the pressure-sensitive electrode 4 are connected to each other at the welding base 401. The side of the welding base 401 away from the elastic component 702 forms a limiting interval of the arc extinguishing plate 8, and the arc extinguishing plate 8 is arranged in the limiting interval.

[0045] In application, the trip spring 701 is welded to the soldering base 401 of the pressure-sensitive electrode 4 by solder. A limiting interval is formed between the trip spring 701 and the inner shell 1 on the side of the soldering base 401 away from the elastic component 702, and the limiting interval is used to assemble the arc extinguishing plate 8. Under the limitation of this limiting interval, the arc extinguishing plate 8 can remain stationary against the elastic restoring force of the elastic component 702. When the solder melts, the arc extinguishing plate 8 will be separated from the limiting interval under the action of the elastic restoring force. The trip spring 701 is an L-shaped structure as a whole, and its end for connecting to the soldering base 401 and the end for connecting to the first external electrode 5 are perpendicular to each other, and are respectively located on the two vertical side walls of the inner shell 1.

[0046] In one embodiment, the inner housing 1 is provided with a limiting plate 102 on one side of the welding platform 401 close to the elastic member 702 for limiting cooperation with the arc extinguishing plate 8 .

[0047] In use, the stop plate 102 is used to block the arc-extinguishing plate 8's movement when it is driven by the elastic member 702 and moves in the direction of the elastic restoring force, causing it to stop at the position of the stop plate 102. The arc-extinguishing plate 8 is made of an insulating material and is used to extinguish the arc during the tripping process. The distance between the stop plate 102 and the welding station 401 is shorter than the length of the arc-extinguishing plate 8. Therefore, when the arc-extinguishing plate 8 stops at the position of the stop plate 102, the arc-extinguishing plate 8 can be located between the welding station 401 and the tripping spring 701, effectively extinguishing the arc.

[0048] In one embodiment, the arc-extinguishing plate 8 is connected to the inner housing 1 in a sliding fit, and the sliding direction of the arc-extinguishing plate 8 is consistent with the direction of the elastic restoring force of the elastic member 702 .

[0049] In use, to ensure the stability of the arc-extinguishing plate 8 during movement, the arc-extinguishing plate 8 is provided with a sliding fit connection to the inner housing 1 to implement sliding guidance, thereby ensuring that the sliding direction of the arc-extinguishing plate 8 is consistent with the direction of the elastic restoring force of the elastic member 702. The sliding fit connection method can be configured by providing guide grooves on both sides of the arc-extinguishing plate 8 and guide rails on the inner housing 1 that slide in the guide grooves; alternatively, guide rails can be provided on both sides of the arc-extinguishing plate 8, and guide grooves on the inner housing 1 that cooperate with the guide rails.

[0050] In one embodiment, Figure 3 As shown, the inner housing 1 is further provided with a pair of warning electrodes 9 which abut against each other under the action of the arc extinguishing plate 8 and separate from each other when the arc extinguishing plate 8 leaves the limit interval.

[0051] In use, the inner shell 1 is a frame-shaped structure with one end open. With the open end serving as the front end, it comprises side walls that enclose the frame structure, and a back plate that closes the other end of the frame structure. The back plate is provided with an alarm electrode assembly slot 103, into which a pair of alarm electrodes 9 are embedded. The arc-extinguishing plate 8 applies a force to the ends of the pair of alarm electrodes 9 facing the arc-extinguishing plate 8, causing the pair of alarm electrodes 9 to abut against each other. A module cover 10 is mounted on the side wall of the inner shell opposite the side wall with the through hole. The other ends of the alarm electrodes 9 are parallel to each other and protrude from the module cover 10 of the inner shell 1. When the arc-extinguishing plate 8 is within the limit range, a force is applied to the alarm electrodes 9, maintaining the pair of alarm electrodes 9 in a state of abutment. When the arc-extinguishing plate 8 leaves the limit range under the action of the elastic member 702, the force applied to the alarm electrodes 9 disappears, causing the pair of abutting alarm electrodes 9 to return to their natural state and separate from each other, triggering the alarm device to issue a remote alarm.

[0052] In one embodiment, Figure 4 As shown, the graphite gap assembly 2 includes a bracket 203 and a plurality of electrode sheets 201 and a plurality of insulating spacers 202 arranged between the brackets 203. The electrode sheets 201 and the insulating spacers 202 are arranged alternately. One of the two electrode sheets 201 located on the outside is connected to the other end of the second external electrode 6, and the other is connected to the varistor 3.

[0053] In application, the electrode sheet 201 is a graphite electrode sheet, and the insulating spacer 202 is arranged between two adjacent graphite electrode sheets. The bracket 203 is a pair, which is respectively arranged on both sides to be fixed to the two ends of the electrode sheet 201 and the insulating spacer 202. Among them, the two outermost electrode sheets 201 of the graphite gap component 2 are used to connect the electrodes to realize a series circuit. Specifically, the second external electrode 6 is set to an L-shaped structure, so that its other end is set parallel to the electrode sheet. The other end of the second external electrode 6 extends into the interior of the inner shell and is in close contact with an electrode sheet located on the outside, thereby realizing series connection with the graphite gap component 2. A varistor 3 parallel to the electrode sheet is tightly fitted on the surface of the other electrode sheet located on the outside, thereby realizing series connection of the varistor 3 and the graphite gap component 2. The bracket 203 is fixed to the second external electrode 6 and the varistor 4 by screws 14.

[0054] In one embodiment, the inner shell 1 further includes a circuit board 11 , a soldering pin 13 and a capacitor 12 , which are arranged in the inner shell 1 . The capacitor 12 is arranged on the circuit board 11 , and the capacitor 12 is connected to the electrode sheet 201 and the second external electrode 6 through the soldering pin 13 .

[0055] In use, this design ensures that the surge protector responds quickly to overvoltage. The connection between capacitor 12, electrode sheet 201, and second external electrode 6 via solder pin 13 facilitates rapid charge release and voltage clamping during an overvoltage event, thereby protecting downstream equipment from damage. Solder pin 13 is made of a material with good conductivity, ensuring a low-resistance connection and reliability, making installation of the surge protector easier. Furthermore, this design takes into account factors such as heat dissipation, space utilization, and compatibility with other components, ensuring the high performance and reliability of the surge protector.

[0056] In one embodiment, Figure 5 As shown, it also includes an outer shell 15, which is covered on the outside of the inner shell 1. A perspective window 151 is provided on the outer shell 15. When the arc extinguishing plate 8 is located in the limit interval, the first indicator label 801 corresponds to the perspective window 151. When the arc extinguishing plate 8 is limited and matched with the limit plate 102, the second indicator label 802 corresponds to the perspective window 151.

[0057] In use, the outer shell 15 is covered on the outside of the inner shell 1 to form the shell of the entire surge protector. The perspective window 151 on the outer shell 15 is consistent with the position of the indicator label, so that the status of the indicator label can be observed through the perspective window 151. When the arc extinguishing plate 8 is located in the limit interval, the first indicator label 801 corresponds to the perspective window 151, so that when the surge protector is in a normal state (i.e., not tripped), the state indicated by the first indicator label 801 can be observed through the perspective window 151, and when the surge protector is in an alarm state (i.e., tripped), the state indicated by the second indicator label 802 can be observed through the perspective window 151. For example, the first indicator label 801 can be set to green and the second indicator label 802 can be set to red, so that before and after the surge protector is tripped, the indicator label can be observed to switch from green to red through the perspective window 151.

[0058] In one embodiment, before the outer shell 15 is placed over the inner shell 1, the inner shell 1 is potted with glue so that the glue completely covers the graphite electrode sheet and other components. The potting glue is made of an insulating material such as epoxy resin potting glue, silicone potting glue, or polyurethane potting glue.

[0059] In one embodiment, Figure 6 As shown, the surge protector realizes the series relationship between the graphite gap component 2 and the varistor 3 through the structure provided by any of the above embodiments, and can change the alarm electrode 9 from the contact state to the separation state after the surge protector is tripped, thereby realizing the remote alarm function.

[0060] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0061] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A surge protection device, characterized in that: The invention comprises an inner shell (1), a graphite gap assembly (2), a varistor (3), a varistor electrode (4), a first external electrode (5), a second external electrode (6), a trip assembly (7) and an arc extinguishing plate (8), wherein the trip assembly (7) comprises a trip spring (701) and an elastic member (702), the graphite gap assembly (2), the varistor (3) and the varistor electrode (4) are arranged in the inner shell (1), and one end of the first external electrode (5) and the second external electrode (6) form a connection terminal of the surge protection device. One end of the graphite gap assembly (2) is connected to the other end of the second external electrode (6), and the other end is connected to the pressure-sensitive electrode (4) through the varistor (3); one end of the tripping spring (701) is connected to the other end of the first external electrode (5), and the other end is connected to the pressure-sensitive electrode (4); the arc-extinguishing plate (8) is arranged between the tripping spring (701) and the inner shell (1); one end of the elastic member (702) is connected to the inner shell (1), and the other end is connected to the arc-extinguishing plate (8); The elastic component (702) is used to trigger the arc extinguishing plate (8) to cut off the connection between the pressure-sensitive electrode (4) and the tripping spring (701).

2. The surge protection device according to claim 1, wherein: The trip assembly (7) further comprises solder having conductive properties and melting when the temperature reaches a thermal melting point, and the pressure-sensitive electrode (4) and the trip spring (701) are connected via the solder.

3. The surge protection device according to claim 1, wherein: The inner shell (1) is provided with a through hole, a welding platform (401) is provided at a position corresponding to the pressure-sensitive electrode (4) and the through hole, the tripping spring (701) and the pressure-sensitive electrode (4) are connected to each other at the welding platform (401), and a side of the welding platform (401) away from the elastic component (702) forms a limiting interval of the arc-extinguishing plate (8), and the arc-extinguishing plate (8) is arranged in the limiting interval.

4. The surge protection device according to claim 3, wherein: The inner housing (1) is further provided with a pair of warning electrodes (9) which abut against each other under the action of the arc extinguishing plate (8) and separate from each other when the arc extinguishing plate (8) leaves the limit interval.

5. The surge protection device according to claim 3, wherein: The inner shell (1) is provided with a limiting plate (102) on a side of the welding platform (401) close to the elastic component (702) for limiting cooperation with the arc extinguishing plate (8).

6. The surge protection device according to claim 1, wherein: The arc-extinguishing plate (8) is connected to the inner shell (1) in a sliding manner, and the sliding direction of the arc-extinguishing plate (8) is consistent with the direction of the elastic restoring force of the elastic component (702).

7. The surge protection device according to claim 5, wherein: The arc extinguishing plate (8) is provided with a first indication label (801) and a second indication label (802), and the first indication label (801) and the second indication label (802) are sequentially arranged along the direction of the elastic restoring force of the elastic component (702).

8. The surge protection device according to claim 7, wherein: The invention also includes an outer shell (15), wherein the outer shell (15) is covered on the outside of the inner shell (1), and a perspective window (151) is provided on the outer shell (15). When the arc extinguishing plate (8) is located in the limit interval, the first indication label (801) corresponds to the perspective window (151); when the arc extinguishing plate (8) is limitedly matched with the limit plate (102), the second indication label (802) corresponds to the perspective window (151).

9. The surge protection device according to claim 1, wherein: The graphite gap assembly (2) comprises a bracket (203) and a plurality of electrode sheets (201) and a plurality of insulating spacers (202) arranged between the brackets (203), wherein the electrode sheets (201) and the insulating spacers (202) are arranged alternately, and one of the two electrode sheets (201) located on the outside is connected to the other end of the second external electrode (6), and the other is connected to the varistor (3).

10. The surge protection device according to claim 9, wherein: It also includes a circuit board (11), a soldering pin (13), and a capacitor (12) arranged in the inner shell (1); the capacitor (12) is arranged on the circuit board (11); and the capacitor (12) is connected to the electrode sheet (201) and the second external electrode (6) via the soldering pin (13).

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