CN201319278Y - Novel pillar composite insulator - Google Patents

Abstract

The utility model relates to a novel post composite insulator, which comprises a mandrel, an umbrella group sheath covering the mandrel and metal end flanges arranged at both ends of the mandrel. The cross section of the mandrel is elliptical; the mandrel The ratio of the major axis to the minor axis of the cross section is greater than 1 and less than or equal to 2; the core rod is made of glass fiber reinforced extruded profile. Due to the special load-bearing structure design of this new post composite insulator, its ability to withstand mechanical loads can be exactly the same as that of traditional post composite insulators in the case of smaller volume and lighter weight than traditional post composite insulators, so saving The material is improved, and the manufacturing cost is effectively reduced.

Description

A kind of novel post composite insulator

Technical field

The utility model belongs to insulator manufacturing technology field, relates in particular to a kind of insulation support of AC and DC power system mesohigh electric equipment and bus and novel post composite insulator of mechanical fixation of being used for.

Background technology

At present, the post composite insulator of production and sales both at home and abroad, the plug that is used to bear mechanical load is column type, and its cross section is circle.Though this its (both insulator cross sections) isotropism in face of post composite insulator of forming by the real core bar body of column type plug with respect to the insulator axis normal, its mechanical property homogeneous, but for most of insulators, in case be installed in the concrete station, its mounting arrangement just determines insulator mechanically stressed inhomogeneous, bear the maximum machine bend loading in a certain principal direction, and other direction is stressed less, be easy to damage in the direction of bearing the maximum machine bend loading like this, make whole post composite insulator discarded, and this post composite insulator volume is big, Heavy Weight, cost is also higher simultaneously.

The utility model content

The purpose of this utility model is to overcome the shortcoming of above-mentioned prior art, a kind of novel post composite insulator is provided, this insulator can effectively improve the ability that whole insulator bears mechanical load by the shape that changes the plug cross section, and has little, the lightweight advantage of volume.

The purpose of this utility model solves by the following technical programs:

This novel post composite insulator comprises plug, is placed in the cluster parachute sheath on the plug and is located at the metal end flange at plug two ends that described plug cross section is oval.

The major axis of above-mentioned plug cross section and minor axis are than being less than or equal to 2 greater than 1.

The material of above-mentioned plug is that glass fibre strengthens crowded pull-up material.

This novel post composite insulator is owing to adopt special load-carrying construction design, under than little, the lightweight situation of traditional post composite insulator volume, the ability of its tolerance mechanical load can be identical with traditional post composite insulator, therefore save material, effectively reduced manufacturing cost.

Description of drawings

Fig. 1-a is that the plug cross section is circular post composite insulator schematic cross-section in the prior art;

Fig. 1-b is the plug schematic cross-section of post composite insulator of the present utility model;

The post composite insulator flexural loading figure that Fig. 2 relates to for the utility model.

Embodiment

Novel post composite insulator of the present utility model comprises plug, is placed in the cluster parachute sheath on the plug and is located at the metal end flange at plug two ends that described plug cross section is oval.The major axis of described plug cross section and minor axis are than being less than or equal to 2 greater than 1.The material of described plug is that glass fibre strengthens crowded pull-up material.

Below in conjunction with accompanying drawing the stressing conditions of the utility model and prior art is done and to be described in further detail:

Referring to Fig. 1-a and Fig. 1-b, for a post composite insulator, install, its maximum deflection that may occur load F just can determine that the bending moment arm L of post composite insulator (being generally the height of post composite insulator) also is definite value.Therefore the maximum bending moment M=FL of post composite insulator also can determine.

The used plug of post composite insulator is that glass fibre strengthen to squeeze pull-up material, process raw material and situation that manufacturing process is constant under, its fundamental performance parameter is thought constant (as density, bending strength [σ], bending modulus etc.).

The post composite insulator strength formula is: ${\mathrm{\σ}}_{\max }==\frac{M_{\max }}{W}\≤\left[\mathrm{\σ}\right]$

In the formula: σ max is a maximum stress in bend, and Mmax is a maximum bending moment, and W is bending sections coefficient (only relevant with the shape and the size in cross section), and [σ] is the permissible bending stress of mandrel material.

The permissible bending stress of mandrel material [σ] is a fixed value.By following formula as can be seen, in a single day determine,, bending sections coefficient W is changed, thereby change the equation relation between M/W and [σ] by changing cross sectional shape and size at insulator maximum bending moment Mmax.

Bending sections coefficient for round section bar $W=\frac{\mathrm{\π}{D}^3}{32},$ Area $S=\frac{\mathrm{\π}{D}^2}{4};$

Bending sections coefficient for oval section bar $W=\frac{\mathrm{\π}{A}^{2}B}{4},$ Area S=π AB.

Below in conjunction with embodiment circular and oval-shaped plug are further described:

Embodiment:

As Fig. 2 is post composite insulator flexural loading figure,

The major axis of the plug cross section of post composite insulator is decided to be 2 with the minor axis ratio, wherein:

Situation 1: major axis is 100mm, and minor axis is 50mm, and post composite insulator length is 1120mm.

Situation 2: major axis is 126mm, and minor axis is 63mm, and post composite insulator length is 1120mm.This kind situation is to utilize the ratio of oval major and minor axis to be defined as 2, utilizes the bending resistant section coefficient formulas in two kinds of cross sections to set up equation again, and then finds the solution, draw two kinds of cross sections the bending resistant section coefficient be equal to or approximate situation under parameters.

For the superiority in oval plug of the present utility model cross section is described, existing is circle with a plug cross section, and diameter D is that 100mm, total length are that the post composite insulator of 1120mm is that contrast model compares.

Following table is the contrast of the novel post composite insulator of present embodiment with respect to the traditional cylindrical plug insulator of comparable size:

According to the visible plug of above form be elliptic cross-section with plug be when circular cross-section reaches equal bending resistance effect, effectively weight reduction, save material, thereby reduce cost.

Claims (3)

1. A novel pillar composite insulator, comprising a mandrel, an umbrella sheath placed on the mandrel and metal end flanges arranged at both ends of the mandrel, characterized in that: the cross-section of the mandrel is elliptical. 2. The novel post composite insulator according to claim 1, characterized in that: the ratio of the major axis to the minor axis of the cross-section of the mandrel is greater than 1 and less than or equal to 2. 3. The novel post composite insulator according to claim 2, characterized in that: the mandrel is made of glass fiber reinforced extruded profile.

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