Fixing device for enabling lightning arrester core body and insulating cylinder to be concentric

Abstract

The utility model relates to the technical field of lightning arresters, in particular to a fixing device enabling a lightning arrester core and an insulating cylinder to be concentric, which comprises an upper circular ring and a lower circular ring which are concentrically arranged, the inner diameter of the upper circular ring is larger than that of the lower circular ring, and the upper circular ring is connected with the lower circular ring through a supporting rod; a plurality of threaded through holes evenly distributed in the circumferential direction are formed in the side wall of the upper circular ring, and a movable screw is connected into each threaded through hole in a penetrating mode. A plurality of positioning springs evenly distributed in the circumferential direction are installed on the inner side wall of the lower circular ring. The fixing device is used for fixing the core body and the insulating cylinder, and then sealant is filled, so that the core body and the insulating cylinder in the assembled lightning arrester can be concentrically arranged, the impact resistance of the lightning arrester is improved, the stress is uniformly released when the lightning arrester is impacted, and unstable electrical performance of the lightning arrester and damage to the core body caused by the impact are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of lightning arrester, specifically relates to a fixing device that makes lightning arrester core body and insulating cylinder concentric. BACKGROUND

[0002] The metal oxide lightning arrester is generally composed of a core body, an insulating cylinder, a composite outer sleeve and a connecting piece, wherein the core body structure is mostly formed by stacking resistance sheets and cushion blocks, and the outer side of the core body is wrapped and solidified by glass fiber cloth belts soaked in epoxy resin.When assembling the metal oxide lightning arrester, the completely solidified core body needs to be placed in the insulating cylinder, but due to the fact that the diameter of the core body does not completely match the diameter of the insulating cylinder, there will be an installation gap between the core body and the inner wall of the insulating cylinder.If there is no good protection measures, the core body will shake and tilt when the lightning arrester is impacted during transportation or work, which will affect the stability of the lightning arrester, and even cause damage to the core body and affect the service life.

[0003] To solve this problem, the prior art pours sealing glue into the gap between the core body and the insulating cylinder after placing the core body in the insulating cylinder during the assembly of the lightning arrester.The sealing glue can play a damping and buffering effect on the core body when the main body of the lightning arrester vibrates, avoiding damage to the main body of the lightning arrester caused by vibration and prolonging the service life of the main body of the lightning arrester.The disadvantage of this method is that when the diameter of the core body does not match the size of the insulating cylinder, the core body is easy to be in a tilted state in the insulating cylinder, that is, the insulating cylinder and the core body are not concentric.When vibration occurs, even if sealing glue is poured into the gap, due to the uneven stress release and large deformation, there is still a risk of affecting the electrical performance of the lightning arrester and damaging the core body. UTILITY MODEL CONTENTS

[0004] In view of the technical problems that the poor stability of the lightning arrester and the easy damage of the core body caused by the fact that the core body and the insulating cylinder are not concentric when pouring in the sealing glue, the utility model provides a fixing device that makes the core body of the lightning arrester and the insulating cylinder concentric, uses the fixing device to fix the core body and the insulating cylinder, and then pours in the sealing glue, which can ensure the concentric arrangement of the core body and the insulating cylinder in the assembled lightning arrester, thereby improving the impact resistance of the lightning arrester, releasing stress uniformly when impacted, and avoiding the unstable electrical performance of the lightning arrester and the damage of the core body caused by the impact.

[0005] The utility model technical scheme is as follows:

[0006] The utility model provides a kind of fixing device of making lightning arrester core and insulating cylinder concentric, including concentrically arranged upper ring and lower ring, the inner diameter of upper ring is greater than the inner diameter of lower ring, and upper ring is connected with lower ring by support rod;A plurality of circumferentially uniformly distributed threaded through holes are formed on the side wall of upper ring, and an adjustable screw rod is connected in each threaded through hole;A plurality of circumferentially uniformly distributed positioning springs are mounted on the inner side wall of lower ring.

[0007] Further, the inner diameter of the upper ring is greater than the outer diameter of the insulating cylinder.

[0008] Further, the inner diameter of the lower ring is greater than the outer diameter of the end electrode of the core, and the outer diameter of the lower ring is smaller than the inner diameter of the insulating cylinder.

[0009] Further, the number of threaded through holes is preferably four.

[0010] Further, the number of positioning springs is preferably four.

[0011] Further, the positioning spring is a spring plunger.

[0012] Further, the number of support rods is three.

[0013] Further, the support rod is fixed with the upper ring by a screw, and the support rod is fixed with the lower ring by a screw.

[0014] Further, an annular support seat is provided on the outer side wall of the upper ring, and the annular support seat is arranged below the adjustable screw rod. A scale is provided on the adjustable screw rod at the orthographic projection position of the annular support seat. By providing the scale corresponding to the position of the adjustable screw rod, precise positioning of the adjustable screw rod is achieved, ensuring that the core and the insulating cylinder are in a concentric state after adjustment, and preventing asymmetric conditions caused by simultaneous adjustment of multiple adjustable screw rods.

[0015] The utility model has the advantages that:

[0016] The utility model realizes the fixation of the insulating cylinder through the upper ring and the adjustable screw rod, and realizes the fixation of the core through the lower ring and the positioning spring, ensuring the concentric assembly of the core and the insulating cylinder. The lightning arrester obtained by pouring sealing glue has good stability. When the lightning arrester is impacted during transportation or work, the stress at each point is uniformly released, which can effectively prolong the service life of the lightning arrester body.

[0017] By providing the adjustable screw rod and the positioning spring, the utility model can fix insulating cylinders and cores of different sizes and diameters, overcoming the defect that the upper ring and the lower ring of fixed size have limited application range, and better meeting the use requirements. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to make the person in this technical field better understand the technical scheme in the utility model, the technical scheme in the embodiment of the utility model will be described clearly and completely below in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person in the art without creative labor should belong to the scope of protection of the utility model.

[0019] Figure 1 It is the top view of the fixing device for example 1.

[0020] Figure 2 It is the cross section schematic diagram of the use state of the fixing device for example 1.

[0021] In the drawing, 1 is the upper circular ring, 2 is the lower circular ring, 3 is the support rod, 4 is the movable screw rod, 5 is the spring plunger, 6 is the annular support seat, 7 is the insulating cylinder, 8 is the core body. DETAILED DESCRIPTION

[0022] In order to make the person in this technical field better understand the technical scheme in the utility model, the technical scheme in the embodiment of the utility model will be described clearly and completely below in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person in the art without creative labor should belong to the scope of protection of the utility model.

[0023] Example 1

[0024] A fixing device for making the arrester core body and the insulating cylinder concentric, comprising concentrically arranged upper circular ring 1 and lower circular ring 2, the inner diameter of the upper circular ring 1 is greater than the outer diameter and the inner diameter of the lower circular ring 2, the upper circular ring 1 and the lower circular ring 2 are connected through three support rods 3, the support rod 3 is fixed with the upper circular ring 1 through a screw, and the support rod 3 is fixed with the lower circular ring 2 through a screw; four screw through holes uniformly distributed along the circumference are formed in the side wall of the upper circular ring 1, and a movable screw rod 4 is connected in each screw through hole; four positioning springs uniformly distributed along the circumference are fixedly connected to the inner side wall of the lower circular ring 2, and the positioning spring is a spring plunger 5.

[0025] The annular support seat 6 is arranged below the movable screw rod 4, and the movable screw rod 4 is provided with a scale at the orthographic projection position on the annular support seat 6.

[0026] The inner diameter of the upper circular ring 1 is greater than the outer diameter of the insulating cylinder, for example, according to the size of the insulating cylinder to be fixed, the inner diameter of the upper circular ring 1 can be 255mm;

[0027] The inner diameter of the lower circular ring 2 is greater than the outer diameter of the end electrode of the core, and the outer diameter of the lower circular ring 2 is smaller than the inner diameter of the insulating cylinder, for example, the inner diameter of the lower circular ring 2 is 78 mm according to the size of the end electrode of the core to be fixed;

[0028] The telescopic head of the spring plunger 5 is 11 mm long and 4 mm in diameter, the spring body is 15 mm long and 6 mm in diameter, and there is a 0.5 mm thick connecting platform between the telescopic head of the spring plunger and the spring body.

[0029] In use, the fixing device is installed from above the lightning arrester, the upper circular ring is sleeved outside the side wall of the upper end of the insulating cylinder, the lower circular ring is sleeved outside the side wall of the end electrode of the core, the movable screw rods are rotated to move the positions of the movable screw rods on the upper circular ring, the four movable screw rods clamp the outer wall of the insulating cylinder, the scale on the annular support seat is observed to ensure that the lengths of the four movable screw rods exposed inside the upper circular ring are consistent, if not, fine adjustment is performed to ensure that the insulating cylinder is concentric with the upper circular ring, and meanwhile, the four spring plungers arranged on the inner side wall of the lower circular ring fix the end electrode of the core. After the insulating cylinder and the core of the lightning arrester are fixed, sealing glue can be poured, and after the sealing glue is solidified, the fixing device can be disassembled.

[0030] In other embodiments, the springs can also be directly fixed on the inner side wall of the lower circular ring as positioning springs.

[0031] Although the utility model has been described in detail by referring to the drawings and in combination with the preferred embodiments, the utility model is not limited thereto. Various equivalent modifications or replacements can be made to the embodiments of the utility model by those skilled in the art without departing from the spirit and essence of the utility model, and these modifications or replacements shall be within the scope of the utility model. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which shall be covered within the protection scope of the utility model.

Claims

1. A fixing device for making a lightning arrester core concentric with an insulating cylinder, comprising an upper circular ring and a lower circular ring arranged concentrically, characterized in that, The inner diameter of the upper circular ring is larger than the inner diameter of the lower circular ring, and the upper circular ring and the lower circular ring are connected through the support rod; a plurality of thread through holes are arranged on the side wall of the upper circular ring and are uniformly distributed in the circumferential direction, and an adjustable screw rod is connected in each thread through hole.

2. The fixture of claim 1, wherein The inner diameter of the upper circular ring is larger than the outer diameter of the insulating cylinder.

3. The fixture of claim 1, wherein The inner diameter of the lower circular ring is larger than the outer diameter of the end electrode of the core body, and the outer diameter of the lower circular ring is smaller than the inner diameter of the insulating cylinder.

4. The fixture of claim 1, wherein The positioning spring is a spring plunger.

5. The fixture of claim 1, wherein The support rod is fixed with the upper circular ring through a screw, and the support rod is fixed with the lower circular ring through a screw.

6. The fixture of claim 1, wherein The outer side wall of the upper circular ring is further provided with an annular support seat, the annular support seat is arranged below the adjustable screw rod, and a scale is arranged at the orthographic projection position of the adjustable screw rod on the annular support seat.

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