Graphite gap L-N surge protector
By using a nonlinear varistor material layer and inert gas filling in the graphite gap LN surge protector, rapid discharge and reduced residual voltage are achieved, improving voltage protection performance and extinguishing current capability, and solving the high voltage and complex circuit problems of traditional surge protectors.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-03-27
AI Technical Summary
Traditional multilayer graphite gap surge protectors have high discharge voltage and residual voltage, and their reliance on complex external triggering circuits increases costs, affects response speed, and reduces safety performance.
The graphite gap LN surge protector achieves rapid discharge and reduces residual voltage by attaching a nonlinear varistor material layer to the conductive skeleton and forming micro-gap through laser etching, combined with an inert gas filling and a shell structure made of conductive ceramic material.
It improves the product's safety performance, reduces residual voltage, enhances voltage protection level, improves current extinguishing capability, and solves the problem of bloated external trigger circuit.
Smart Images
Figure CN224053889U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of surge protector, more specifically, it relates to a graphite gap L N surge protector. BACKGROUND
[0002] With the continuous development of power system and the wide application of electrical equipment, the risk of line suffering from lightning and other surge impact is increasing. However, the traditional multilayer graphite gap usually adopts air series structure, resulting in high discharge voltage and residual voltage. In addition, it depends on complex external trigger circuit, such as RC circuit or double ignition circuit, which not only increases the cost of installation and maintenance, but also affects the response speed and safety performance. SUMMARY
[0003] In view of the deficiencies existing in the prior art, the utility model aims at providing a graphite gap L N surge protector, which has the advantages of improving the safety performance of the product, reducing the residual voltage, improving the voltage protection level, and improving the extinction current capacity.
[0004] The above technical purpose of the utility model is realized by the following technical scheme: a graphite gap L N surge protector, comprising: a shell;
[0005] Two conductive electrodes are arranged at both ends of the shell respectively;
[0006] Two mounting racks are arranged on both sides of the inside of the shell respectively;
[0007] A plurality of graphite sheets are inserted between the two mounting racks;
[0008] Two conductive body skeletons are laid on both sides of the graphite sheet close to the shell respectively;
[0009] A layer of nonlinear pressure sensitive material is arranged on the inner wall of the conductive body skeleton;
[0010] Among them, there is a graphite gap between the two adjacent graphite sheets, and one side of the nonlinear pressure sensitive material layer close to the graphite sheet is provided with a micro gap.
[0011] In one embodiment, the inside of the shell is filled with inert gas.
[0012] In one embodiment, the inner side of the mounting rack is provided with a plug-in slot, and the graphite sheet is inserted into the plug-in slot.
[0013] In one embodiment, two plugs are further included, which are arranged between the shell and the conductive electrode.
[0014] In one of the embodiments, the shell comprises an inner shell and an outer shell, the outer shell is sleeved on the inner shell, and the inner shell is sleeved on the mounting frame.
[0015] In one of the embodiments, four fixing members are further included, the inner shell is provided with clamping grooves at both ends of the upper and lower sides, and the fixing members are clamped with the corresponding clamping grooves.
[0016] In one of the embodiments, the inner wall of the inner shell is provided with a recess, and the recess is used for accommodating the conductive body framework.
[0017] In one of the embodiments, the two conductive electrodes are respectively arranged in the diagonal direction of the two ends of the shell.
[0018] In one of the embodiments, the shell, the mounting frame and the conductive body framework are all made of conductive ceramic material.
[0019] The above-mentioned graphite gap L-N surge protector has the following beneficial effects:
[0020] The utility model discloses a sintering process is attached to the nonlinear piezoresistive material layer on the conductive body framework, and then the nonlinear piezoresistive material layer is carried out laser etching, and micro gap is formed. When there is an abnormally high voltage between lines, the micro gap ignites to trigger the discharge of the multilayer graphite gap in advance, improves the safety performance of the product, reduces the residual voltage of the multilayer graphite gap product, improves the voltage protection level, improves the continuous current capacity of the product, and solves the problem of external trigger circuit. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 It is the perspective view of the embodiment;
[0022] Figure 2 It is the explosion schematic view of the embodiment;
[0023] Figure 3 It is the sectional view of the embodiment;
[0024] Figure 4 It is the structural schematic view of the mounting frame and graphite sheet in the embodiment;
[0025] Figure 5 It is the structural schematic view of the conductive body framework and nonlinear piezoresistive material layer in the embodiment.
[0026] In the drawing: 1, inner shell; 101, clamping groove; 102, recess; 2, outer shell; 3, conductive electrode; 4, mounting frame; 401, plug-in slot; 5, graphite sheet; 6, conductive body framework; 7, nonlinear piezoresistive material layer; 701, micro gap; 8, graphite gap; 9, blocking piece; 10, fixing member. DETAILED DESCRIPTION
[0027] The utility model will be described in detail below with reference to the drawings and embodiments.
[0028] In the description of the utility model, it needs to understand that, the orientation or positional relation indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relation shown in the drawings, and are only for the convenience of describing the utility model, and therefore cannot be understood as limiting the utility model.
[0029] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, unless otherwise specifically limited.
[0030] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0031] In the utility model, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0032] A kind of graphite gap L-N surge protector, such as Figure 1 、 Figure 2 And Figure 3As shown, it comprises: a shell; two conductive electrodes 3, respectively arranged at both ends of the shell; two mounting racks 4, respectively arranged at both sides of the inside of the shell; a plurality of graphite sheets 5, inserted between the two mounting racks 4; two conductive body skeletons 6, respectively laid on both sides of the graphite sheet 5 close to the shell; a nonlinear voltage-dependent resistor layer 7 arranged on the inner wall of the conductive body skeleton 6.
[0033] Specifically, the mounting rack 4 plays a supporting and fixing role of the graphite sheet 5, and ensures the position stability of the graphite sheet 5. The conductive body skeleton 6 is in close contact with the graphite sheet 5, which can ensure that the conductive body skeleton 6 can quickly introduce lightning current into the ground when suffering from lightning, and effectively protect the electrical equipment.
[0034] Further, as shown in Figure 3 and Figure 4 , the adjacent two graphite sheets 5 have a graphite gap 8 between them, and the nonlinear voltage-dependent resistor layer 7 has a micro gap 701 on the side close to the graphite sheet 5.
[0035] Specifically, the plurality of graphite sheets 5 form a plurality of graphite gaps 8, which can gradually absorb and release overvoltage energy, reduce residual voltage, and improve protection effect. The nonlinear voltage-dependent resistor layer 7 includes a trigger ignition circuit, which can quickly conduct under overvoltage conditions, forming a low-impedance path so that the current can quickly pass through, thereby triggering the micro gap 701 to discharge in advance.
[0036] In actual application, the nonlinear voltage-dependent resistor layer 7 is attached to the conductive body skeleton 6 by sintering process, and then laser etching is performed on the nonlinear voltage-dependent resistor layer 7 to form a micro gap 701. When there is an abnormally high voltage between the lines, the micro gap 701 ignites to trigger the multiple graphite gaps 8 to discharge in advance, improving the safety performance of the product; at the same time, the residual voltage of the multiple graphite gaps 8 product is reduced, the voltage protection level is improved, the product's current interruption capability is improved, and the problem of external trigger circuit is solved.
[0037] Further, the inside of the shell is filled with inert gas.
[0038] Specifically, the ionization voltage of the inert gas is low and the ionization stability is high, so that the discharge process can be triggered more effectively. At the same time, the inert gas can prevent oxidation reaction of the graphite sheet 5 and the conductive body skeleton 6 and other components, and improve the stability and reliability of the surge protector.
[0039] Further, as shown in Figure 4 , the inner side of the mounting rack 4 is provided with a plug-in slot 401, and the graphite sheet 5 is inserted into the plug-in slot 401, which ensures the close cooperation between the graphite sheet 5 and the mounting rack 4, thereby ensuring the stability and reliability of the structure of the multiple graphite gaps 8.
[0040] Further, as shown in Figure 2As shown, the housing further comprises two blocking pieces 9, which are arranged between the housing and the conductive electrodes 3.
[0041] Specifically, the blocking pieces 9 are used to close the housing and prevent external impurities, moisture, etc. from entering the interior of the housing.
[0042] Further, as shown in Figure 2 and Figure 3 , the housing comprises an inner housing 1 and an outer housing 2, the outer housing 2 is sleeved on the inner housing 1, and the inner housing 1 is sleeved on the mounting frame 4.
[0043] Specifically, the outer housing 2 provides external protection, and the inner housing 1 further protects the conductive body framework 6, the graphite sheet 5, the mounting frame 4, etc. to ensure the normal operation and stability of the surge protector.
[0044] Further, as shown in Figure 2 , the housing further comprises four fixing pieces 10, both ends of the inner housing 1 on the upper and lower sides are provided with clamping grooves 101, and the fixing pieces 10 are clamped with the corresponding clamping grooves 101.
[0045] Specifically, the fixing pieces 10 are clamped on the clamping grooves 101, which can enhance the connection stability between the conductive body framework 6 and the inner housing 1, and prevent loosening or displacement during operation.
[0046] Further, as shown in Figure 2 , the inner wall of the inner housing 1 is provided with a recess 102, which is used to accommodate the conductive body framework 6, so that the conductive body framework 6 can be tightly embedded in the inner housing 1, ensuring its stability during operation.
[0047] Further, as shown in Figure 1 and Figure 3 , the two conductive electrodes 3 are arranged in the diagonal direction at both ends of the housing, which ensures that the current can be evenly distributed and conducted when the surge protector is struck by lightning, avoiding damage to the equipment due to current concentration.
[0048] Further, the housing, the mounting frame 4 and the conductive body framework 6 are all made of conductive ceramic material.
[0049] Specifically, the conductive ceramic material has good electrical conductivity and mechanical strength, and can maintain stability under high voltage and high current conditions, thereby improving the durability and reliability of the surge protector.
[0050] The working principle of the utility model is: the multilayer graphite gap 8 is in parallel in the circuit, when the power grid voltage is normal, the multilayer graphite gap 8 is not conductive, and is in standby state, when the circuit suffers lightning or overvoltage, the micro gap 701 ignites and triggers the multilayer graphite gap 8 to discharge in advance, the inert gas between the graphite sheets 5 is ionized, the discharge between the two graphite sheets 5 makes the graphite gap 8 conductive, and the lightning current is introduced into the ground to protect the electrical equipment, after the lightning current, the multilayer graphite gap 8 restores the non-conductive state, the whole process effectively improves the safety performance of the product, reduces the residual voltage, improves the voltage protection level, and improves the extinction current capacity, and solves the problem of the bulky external trigger circuit.
[0051] The above-mentioned embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.
Claims
1. A graphite gap LN surge protector, characterized in that, include: case; Two conductive electrodes are respectively disposed at both ends of the housing; Two mounting brackets are respectively located on both sides inside the housing; Multiple graphite sheets are inserted between the two mounting brackets; Two conductive skeletons are respectively laid on both sides of the graphite sheet near the shell; A nonlinear pressure-sensitive material layer is disposed on the inner wall of the conductive skeleton; There is a graphite gap between two adjacent graphite sheets, and the nonlinear pressure-sensitive material layer has a micro-gap on the side near the graphite sheet.
2. The graphite gap LN surge protector according to claim 1, characterized in that: The interior of the shell is filled with an inert gas.
3. The graphite gap LN surge protector according to claim 1, characterized in that: The mounting bracket has an insertion slot on its inner side, and the graphite sheet is inserted into the insertion slot.
4. The graphite gap LN surge protector according to claim 1, characterized in that: It also includes two plugs, which are disposed between the housing and the conductive electrode.
5. A graphite gap LN surge protector according to claim 1, characterized in that: The housing includes an inner shell and an outer shell, the outer shell being fitted onto the inner shell, and the inner shell being fitted onto the mounting bracket.
6. A graphite gap LN surge protector according to claim 5, characterized in that: It also includes four fasteners, and the upper and lower ends of the inner shell are provided with snap-fit grooves, and the fasteners snap-fit into the corresponding snap-fit grooves.
7. A graphite gap LN surge protector according to claim 5, characterized in that: The inner wall of the inner shell has a recess for accommodating the conductive skeleton.
8. A graphite gap LN surge protector according to claim 1, characterized in that: The two conductive electrodes are respectively located at opposite ends of the housing.
9. A graphite gap LN surge protector according to claim 1, characterized in that: The housing, the mounting bracket, and the conductive skeleton are all made of conductive ceramic material.