Lightning arrester

Abstract

The utility model provides a lightning arrester which comprises an insulating sleeve, an upper electrode, a lower electrode and a core body assembly, the upper electrode and the lower electrode are respectively arranged at two ends of the insulating sleeve, and the core body assembly is arranged in the insulating sleeve; wherein the end part of the insulating sleeve is fixedly connected with the corresponding electrode through a radial fastening structure. According to the lightning arrester disclosed by the utility model, the insulating sleeve and the electrode are fixedly connected by adopting the radial fastening structure instead of axial thread crimping connection, so that the lightning arrester is easy to process and convenient to assemble, and the mechanical strength can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lightning arresters, in particular to a lightning arrester. Background Art

[0002] At present, the most common preventive measure for power equipment is the arrester. The arrester mainly includes an epoxy insulating sleeve, electrodes arranged at both ends of the insulating sleeve, and a core assembly located inside the sleeve. Among them, the insulating sleeve and the electrode are connected by a threaded connection. However, since the epoxy insulating sleeve is not easy to process threads, this connection method will lead to high production costs of the arrester, long installation time, and when the impulse voltage is too large, it is easy to break the electrode end and cause failure. Utility Model Content

[0003] In view of the above technical problems, the technical solution adopted by the utility model is:

[0004] An embodiment of the utility model provides a lightning arrester, comprising: an insulating sleeve, an upper electrode, a lower electrode and a core assembly, wherein the upper electrode and the lower electrode are respectively arranged at two ends of the insulating sleeve, and the core assembly is arranged inside the insulating sleeve; wherein the end of the insulating sleeve and the corresponding electrode are fixedly connected by a radial fastening structure.

[0005] The utility model has at least the following beneficial effects:

[0006] In the lightning arrester provided by the embodiment of the utility model, the insulating sleeve and the electrode are fixedly connected by a radial fastening structure instead of an axial threaded crimping connection, which can make processing and assembly easy and can improve mechanical strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0008] Figure 1 A partial cross-sectional view of a lightning arrester provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0009] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0010] Figure 1 The schematic diagram is to show the half structure of the lightning arrester of the utility model embodiment. The lightning arrester of the utility model embodiment is as follows Figure 1 The leftmost dotted line L is the structure of the symmetry axis.

[0011] The utility model provides a lightning arrester, such as Figure 1 As shown, it includes: an insulating sleeve 1, an upper electrode 2, a lower electrode (not shown) and a core assembly. The upper electrode and the lower electrode are respectively arranged at the two ends of the insulating sleeve, for example, the upper electrode 2 is arranged at the first end of the insulating sleeve, and the lower electrode is arranged at the second end of the insulating sleeve. The core assembly is arranged inside the insulating sleeve; wherein the end of the insulating sleeve and the corresponding electrode are fixedly connected by a radial fastening structure.

[0012] Further, in the embodiment of the utility model, the radial fastening structure may include a plurality of radial fastening holes 5 and fasteners (not shown) inserted into the plurality of radial fastening holes. A plurality of first radial holes spaced apart in the circumferential direction are formed on each end of the insulating sleeve 1, a plurality of second radial holes spaced apart in the circumferential direction are formed on the electrode, the plurality of second radial holes are matched with the plurality of first radial holes, and each first radial hole cooperates with the corresponding second radial hole to form a radial fastening hole.

[0013] In the embodiment of the utility model, the specific size of the radial fastening hole can be set based on the specific size of the arrester. The number of radial fastening structures can be determined based on the diameter of the insulating sleeve. Generally, the larger the diameter of the insulating sleeve, the more radial fastening structures there are.

[0014] In the embodiment of the utility model, the fastener may be, for example, a round pin, a countersunk bolt, a rivet, etc.

[0015] The lightning arrester provided in this embodiment has an insulating sleeve and an electrode that are fixedly connected by a radial fastening structure rather than a threaded connection. Therefore, even if the impulse voltage is too large, the two can be stably connected, thereby ensuring a firm combination of the insulating sleeve, the core assembly and the electrode under long-term operation.

[0016] In an embodiment of the utility model, the electrode may include: an exposed portion exposed from the insulating sleeve and an embedded portion inserted into the insulating sleeve, and the exposed portion and the embedded portion are formed integrally.

[0017] The exposed portion includes an exposed base 201 and a protruding end 202 disposed in the middle of the exposed base and protruding in the first direction. The embedded portion may include an embedded base 203, an annular body 204 and a column 205, wherein the annular body 204 is formed to protrude in the second direction along the outer circumference of the embedded base 203, and the column is formed to protrude in the second direction along the middle of the embedded base.

[0018] The first direction and the second direction are opposite to each other. Specifically, the first direction is a direction away from the core component, and the second direction is a direction close to the core component.

[0019] A threaded hole 206 is formed on the embedded portion, and the threaded hole 206 extends from the protruding end to the column; the second radial hole is arranged on the embedded base.

[0020] When the embedded portion is inserted into the end of the corresponding insulating sleeve, the end of the exposed base plate 201 is connected to the side end of the end of the corresponding insulating sleeve.

[0021] Furthermore, a step portion 101 is formed in the end of the insulating sleeve, and the height of the step portion 101 is less than the thickness of the annular body of the embedded portion of the electrode. The step portion is used to limit the electrode when the embedded portion is inserted into the insulating sleeve. In this way, the core assembly can be stably located between the two electrodes.

[0022] Furthermore, a sealing member 4 is provided between each end of the insulating sleeve and the corresponding embedded portion, so that it is difficult for external moisture to enter the insulating sleeve. In an exemplary embodiment, the sealing member can be a sealant or a sealing ring.

[0023] Further, in the embodiment of the present utility model, if Figure 1 As shown, the end of the exposed base plate 201 is formed into an arc structure. Specifically, the upper surface and the lower surface of the exposed base plate 201 are connected by an arc surface. Since the end of the exposed base plate is formed into an arc structure, discharge at the electrode tip can be prevented, and the performance of the arrester can be improved.

[0024] Further, in the embodiment of the utility model, the core assembly may include a first elastic adjustment assembly, a resistor assembly and a second elastic adjustment assembly connected in sequence. Each elastic adjustment assembly includes an elastic element 3 and a crimping piece 4, one end of the elastic element 3 is connected to the corresponding electrode, and the other end is connected to the corresponding crimping piece.

[0025] In an illustrative embodiment, the elastic element is a butterfly spring, which is sleeved on the corresponding column and located in the accommodation space formed by the corresponding annular body and the column. In this practical embodiment, due to the use of the butterfly spring, when the insulating sleeve and the electrode are connected by a radial fastening structure, the dispersion of the spring compression force can be guaranteed to decrease, and the integration performance of the insulating sleeve and other components can block and suppress the arc generated by the system overvoltage on the resistor, thereby avoiding the internal arc of the arrester from ablating the adjacent resistor, slowing down or avoiding the internal hidden dangers or expansion.

[0026] Furthermore, each crimping member includes a circular crimping disc 401 and an annular boss 402 protruding from the crimping disc, and the annular boss 401 is connected to the corresponding butterfly spring. The crimping member can be made of metal.

[0027] In the embodiment of the utility model, the resistor assembly may include m resistors 5 and m-1 metal gaskets 6, and a metal gasket is arranged between two adjacent resistors, where m≥2. That is, the resistor assembly is a structure formed by resistors and metal gaskets connected in series in a certain order, specifically including the first resistor, the first metal gasket, the second resistor, ..., the i-th metal gasket, the j-th resistor, ..., the m-1-th metal gasket and the m-th resistor connected in sequence, wherein i ranges from 1 to m-1, and j ranges from 1 to m.

[0028] In the embodiment of the utility model, the specific value of m can be set based on actual needs. The metal gasket and the resistor are both circular structures. Each crimping piece is connected to the corresponding resistor.

[0029] In summary, the lightning arrester provided by the embodiment of the utility model can reduce machining costs and assembly costs due to the use of a radial fastening structure to fix the insulating sleeve and the electrode. Compared with the existing axial threaded crimping connection method, it is easier to control the machining precision quality, and the overall sealing performance of the core is better, and the mechanical tensile strength and bending strength are better.

[0030] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should also be understood by those skilled in the art that various modifications may be made to the embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A lightning arrester, characterized in that: include: An insulating sleeve, an upper electrode, a lower electrode and a core assembly, wherein the upper electrode and the lower electrode are respectively arranged at two ends of the insulating sleeve, and the core assembly is arranged inside the insulating sleeve; wherein the end of the insulating sleeve and the corresponding electrode are fixedly connected by a radial fastening structure.

2. The lightning arrester according to claim 1, characterized in that: The radial fastening structure comprises a plurality of radial fastening holes and fasteners inserted into the plurality of radial fastening holes; Among them, a plurality of first radial holes spaced apart along the circumferential direction are formed on each end of the insulating sleeve, and a plurality of second radial holes spaced apart along the circumferential direction are formed on the electrode, the plurality of second radial holes are adapted to the plurality of first radial holes, and each first radial hole and the corresponding second radial hole cooperate to form a radial fastening hole.

3. The lightning arrester according to claim 2, characterized in that: The electrode includes: an exposed portion exposed from the insulating sleeve and an embedded portion inserted into the interior of the insulating sleeve, the exposed portion includes an exposed base and a protruding end arranged in the middle position of the exposed base and protruding in a first direction; the embedded portion includes an embedded base, an annular body and a column, the annular body is formed to protrude in the second direction along the outer circumferential direction of the embedded base, and the column is formed to protrude in the second direction along the middle position of the embedded base; a threaded hole is formed on the embedded portion, and the threaded hole extends from the protruding end to the column; wherein the first direction and the second direction are opposite; the second radial hole is arranged on the embedded base; when the embedded portion is inserted into the end portion of the corresponding insulating sleeve, the end portion of the exposed base is connected to the side end of the corresponding end portion of the insulating sleeve.

4. The arrester according to claim 3, characterized in that: The end of the exposed base plate is formed into an arc-shaped structure.

5. The lightning arrester according to claim 3, characterized in that: The core assembly includes a first elastic adjustment assembly, a resistor assembly and a second elastic adjustment assembly connected in sequence; each elastic adjustment assembly includes an elastic element and a crimping piece, one end of the elastic element is connected to the corresponding electrode, and the other end is connected to the corresponding crimping piece; the resistor assembly includes m resistors and m-1 metal gaskets, a metal gasket is arranged between two adjacent resistors, and m≥2.

6. The arrester according to claim 5, characterized in that: The elastic element and the butterfly spring are sleeved on the corresponding column and located in the accommodating space formed by the corresponding annular body and the column.

7. The arrester according to claim 6, characterized in that: Each crimping member includes a circular crimping disk and an annular boss protruding from the crimping disk, and the annular boss is connected to the butterfly spring.

8. The lightning arrester according to claim 3, characterized in that: A sealing member is arranged between each end of the insulating sleeve and the corresponding embedded portion.

9. The lightning arrester according to claim 2, characterized in that: The fastener is one of a round pin, a countersunk bolt and a rivet.

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