SU754490A1 - Partition insulator - Google Patents

Description

The invention relates to electrical engineering, in particular to the bushing insulators and can be used when exposed to high temperatures and high static loads.

It is known that in order to isolate the system of ⁵ corona electrodes from the body of the electrostatic precipitator, it is fixed with the help of hollow insulators. Loadings insulators of the discharge system ₁₀ rows in electric electrostatic reach high values, moreover, the insulators may be under the influence of high temperature gas to be purified. Since insulators

are based on metal structures _{) 5} of the electrostatic precipitator case, and from above they are subjected to a static load, then under the effect of the temperature difference between the material of the insulator case and the metal of the mounting flange, insulator ₂ 0 produces large tensile stresses, as a result of which they break. To protect the installation flange of the insulator against exposure

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temperature of the apparatus, on which ok is installed, a layer of dark insulating material is placed under the flange.

However, it is not possible to fully protect the insulator case from destruction, since the insulator flange is heated directly from the gas that washes as the inner surface of the insulator case, the hook and the inner edge of the installation flange.

The purpose of the invention is to improve the reliability of the insulator at work.

The goal is achieved by the fact that the bushing insulator, through a hollow body of which is made of insulating material, has a current-carrying rod, and on the ends of the body there is a cap and a mounting flange designed to fasten the insulator to the device, provided with a flat ring between the end of the body and the flange. from a material whose coefficient of thermal expansion is greater than the coefficient of thermal expansion

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The materials of the body and the flange "are alternated along the inner and outer radii of the rings alternating and overlapping each other 'radial slots.

The length of the slits on the inner and outer radii is at least 2/3 and 1/2 of the ring width, respectively.

Figure 1 shows the bushing, a slit, with the fastening of the outer edge _{10 of the} flat ring by an abutment into the outer shoulder of the mounting flange; FIG. 2 is a section A-A in FIG. one; in fig. 3 - bushing, incision, with fastening the outer edge of the flat ring to the flange of the studs; ₁₅ in FIG. 4 a section BB in FIG. 3,

The insulator contains a cap 1 located on the flat end of the housing 2 and a temperature compensating flat ring 3 placed on the mounting flange 4 _2θ and secured with studs 5. In the ring there are slots 6 along the inner radius, and slots 7 alternating and overlapping one another along the outer radius.

Static load; attached to the 25 cap 1, is transmitted to the housing 2, which rests on the inner edge of the ring 3, which lies on the mounting flange 4.

In the proposed insulator can be two options for installing a flat ring zd in the installation flange. In the first case, the Ring with the outer edge of the calculated radius "P" is tightly, without a gap, inserted into the groove in the mounting flange, and in the second case, the flat ring is connected 35 along the outer edge with the mounting flange of the stud 5; at the same time, the calculated radius ^W R ^{W of the} edge of the ring is the circumference of the connected studs.

The indispensable working conditions of thermo

compensating devices are:

1. Ring material must have

coefficient of thermal expansion is greater than the installation material. flange, 45

2. The thermal compensating ring should

firmly connect the outer edge with the mounting flange.

3. The connection of the insulator case should occur along the plane of the inner 50 edge of the thermal compensating ring.

4. The radius of the outer circumference is thermo-

compensating ring, which ensures stability from thermal expansion of the inner circle, 55 on which the insulator is supported, should be: 1? - R - g

I 2 ' ^ιΊ 9 1

where p is the average radius of the reference end

insulator; 0. ₁ , is the coefficient of thermal expansion of the metal of the support flange, οί 2 "is also a temperature compensating ring.

The ring with its outer edge is firmly fastened with the flange, therefore when heated, their temperature deformations will act not so much towards increasing the outer diameter of the ring, but rather inwards along the radii, due to the difference in coefficient of temperature expansion of the thermal compensating ring and the mounting flange.

With an appropriate selection of the outer diameter of the thermocommuting ring and its material, it is possible to achieve such a situation when the diameter of the inner edge of the ring on which the insulator rests will practically not change from temperature.

The outer edge of the thermal compensating ring can be fastened either by fitting it tightly into the groove in the support flange with an emphasis on the outer flange shoulder, or by fastening the ring to the flange with studs or bolts to tighten the joint and the flange from each other. arising from the difference in temperature deformations.

Since when the temperature of the temperature compensating device changes, the ring and flange elements will have mutual displacements, mainly directed along the radii, to reduce the friction force, a clean treatment of their contacting surfaces is necessary. To reduce the possibility of warping of the plane of the thermal compensating ring, the latter have narrow cuts along the radii: the inside 'to a depth of at least 2/3 and the outside not less than 1/2 the width of the ring, while the external cuts are located between the inside, in the middle of them, and the number of outside Cuts may be less internal.

Although the static load on the isolator is transmitted as from the mounting flange,

and from the cap, it is practically required to protect the insulator against the difference of the temperature-dependent extensions only from the mounting flange.

Since the cap is removed from the main

gas flow, has a large surface for the removal of heat into the surrounding space and can be easily protected

thermally insulated from the inside, its tempera 754490

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the tour will be significantly lower than the temperature of the installation flange, and therefore the possibility of destruction of the isopyator case from the difference in temperature expansions is insignificant.

Claims (2)

Claim 1. A bushing insulator containing a hollow body made of insulating material, through which a conductor rod is passed, and a cap and mounting flange located respectively at the ends of the body, designed to fasten the insulator to the apparatus, characterized in that it is positioned between the end face insulator enclosures and flan6 cement flat ring made of a material with a coefficient of thermal expansion greater than the coefficient of thermal expansion of materials ₅ housing and flange, while the inner and outer radii of the ring are alternating and overlapping one another radial slots. 2. The bushing insulator in accordance with claim 1 of which is with the chain of increasing reliability at increased loads, the length of the slits in the inner and outer radii is at least 2/3 and 1/2 of the ring, respectively.