A method of manufacturing a high-voltage insulator rod type

 

The invention relates to the field of electrical engineering, in particular to a method of manufacturing a high-voltage insulator rod type, and can be used on the transmission lines of high voltage. The technical result is that the method can significantly reduce the number of defects during firing, reduce drying time, reduce the time of firing of the product, to avoid the formation of S-shaped cracks, reduce waste, when drying products. This is achieved by extruding the procurement of raw insulating mass with the formation of through holes in the center piece, then turning, drying, glazing machine and firing, and after drying, the preform formed in the through hole is inserted a rod made of the same material as the workpiece, and pre-fired to a temperature that provides the initial strength of the rod and at the same time not specal it to the final density of the product, length, providing resistance withstanding voltage of 110 kV in order to avoid electrical breakdown, with the formation of the monolithic body after firing of the product. 3 Il.

The invention relates to the field of electrical engineering, in particular to the way the Chi high voltage.

A known method of manufacturing a rod insulators, which consists in the preparation of porcelain mass, making harvesting a method of inserting a mandrel on a lathe, drying, glazing machine and firing. Billet insulators get on vacuum presses, equipped with special mouthpieces-nozzles (Nikulin N. In., The Kortnev centuries "Production of washing products. Ed. High school, M. 1965).

The disadvantage of this method is that in the manufacture of rod insulators, the billet is a solid cylindrical body, so it is technically difficult to avoid such a defect, as S-shaped crack which may occur during the molding, and after drying, and even firing. Drying of solid porcelain with large sizes, is a complex operation, because the removal of moisture is only with the outer surface, the processes of external and internal diffusion often do not coincide, which leads to stress and usually cracks on the product. Firing porcelain is also complicated by the fact that the product has a solid and massive form.

The closest in technical essence and the achieved result is a method of manufacturing a high voltage is the fact that the turning, drying, the formation of through holes, the glazing machine and firing (WITH A. 1026167, BI 24 from 30.06.83 year).

The objective of the invention is a significant reduction in defects during firing, the decline of marriage when drying products, the impossibility of formation of S-shaped cracks, reducing drying time, reducing the time of firing of the product.

The problem is solved by a method of manufacturing a high-voltage insulator rod type, including extrusion billet from raw insulating mass with the formation of through holes in the center piece, the subsequent grinding, drying, glazing machine and firing, and after drying in the formed through hole is inserted a rod made of the same material as the workpiece, and pre-fired to a temperature that provides the initial strength of the rod and at the same time not specal it to the final density of the product, with the formation of the monolithic body after firing of the product.

As the material of the rod porcelain mass.

The essence of the invention lies in the fact that the insulating rod type initially molded by type of flow, forming an internal cylindrical hole through the core (mandrel), the diameter of which RA is the tension and bending). This allows to eliminate the possibility of occurrence of S-shaped cracks in the molding of the preform, to significantly reduce the drying time by reducing the diffusion path of moisture ( almost more than twice) and remove moisture from the two surfaces ( inner and outer), and provide more favorable conditions for the sintering of the product, thereby decreasing the likelihood of deformation and cracks.

Given that the rod type insulators inner hole is not acceptable due to possible electrical breakdown, the present invention is proposed in the hole of the bushing insert rod made of porcelain mass of the same composition as that of the insulator. The rod is pre-calcined at a temperature which provides the initial strength of the rod and at the same time, not seals it completely. Then loop through the insulator together with the rod burn to the final firing temperature. The length of the rod should provide the necessary resistance of the insulator to avoid electrical breakdown.

In Fig. 1 shows a high-voltage insulator rod type (in section), produced by the proposed method, after forming the through holes and to insert the rod, where 1 - to terravore type (in section) after insertion of the rod 3, but before the final firing of the product.

In Fig. 3 presents a high-voltage insulator rod type (in section), where the through hole after insertion of the rod 3 and roasting products are actually eliminated to a depth equal to the height of the rod.

The insulator may be made from any other washing mass. The rod, which is inserted into the through hole, is also made from the same ceramic material.

An example of manufacturing an insulator For tape vacuum press get porcelain billet length 620 mm, with a diameter of 150 mm with a through hole with a diameter of 20 mm (humidity weight for pulling equal to 20%). The resulting billet provalivajut to a moisture content of 18.3%. The workpiece obtochuyut on a lathe horizontal type with a special set of tools. Set the workpiece is dried to a moisture content of 0.7%. The drying time of the insulator through-type 24 hours, while the drying time in the same prison without holes 36 hours.

Dried insulator Glasurit by dipping method. The rod of diameter 20 mm and length of 40 mm is fired to a temperature of 1200oWith this, he shrinks 10%. After that, the rod is inserted into the dried and zaglazurovana blank and send to compatible with the screens 72 hours. The firing temperature of the workpiece with the rod 1320oC. this process produces a monolithic body (see Fig.3). The resulting product can withstand a voltage of 110 kV and has a mechanical tensile strength not less than 7 so

Claims

A method of manufacturing a high-voltage insulator rod type, including extrusion billet from raw insulating mass, forming through holes in the center piece, the subsequent grinding, drying, glazing machine and firing, characterized in that after drying in the formed through hole is inserted a rod made of the same material as the workpiece, and pre-fired to a temperature which gives the initial strength of the rod and at the same time not specal it to the final density of the product, with long, providing resistance withstanding voltage of 110 kV in order to avoid electrical breakdown, with the formation of the monolithic body after firing of the product.

 

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