The method of obtaining a solid defensive ribbed coating for polymer insulators
(57) Abstract:The invention relates to electrical engineering, in particular to the production technology insulators for the electrical industry. The method consists in installing a coaxial outer tube and inner element in the form of a pipe or rod, and then between them consistently stack detachable liners and procurement of raw silicone rubber. Press up until the point of these liners. The vulcanization lead in two stages: pre - press-form and final - product after extraction from the mold. 3 Il. The invention relates to electrical engineering, in particular to the production technology insulators for the electrical industry.A known method of manufacturing bellows PTFE carried out by sintering of pellets pressed from a powder and having an annular shape, in a special form with detachable metal liners and rings. Rings are involved in the design of the outer part of the product, the liners of the fusible alloy or plaster are used to design the internal parts. After product manufacturing gypsum liners are dissolved in hot water, and rings are removed 
In itaway rubber, selected for the prototype, when the mold is filled with the required amount of rubber 
This coating to form the mold consisting of two half-form, in which the fixed half. The mold is filled under pressure with liquid rubber, stand at room temperature until curing of the rubber, i.e. until the end of the curing process, the coating is removed from the mold.The disadvantage of this method is the necessity of using a special type of rubber, the cost is quite high, in addition, according to CIGRE experience has shown that this rubber does not have a sufficiently high erosion resistance of the surface of the product.The purpose of the invention improve the quality of the protective coating and reduce the cost of the final product.The proposed method of producing a solid defensive ribbed coating of silicone rubber polymer insulators is as follows.Install vertical outer tube and the inner dielectric load-bearing element. Then between them consistently stack detachable liners and procurement of raw silicone rubber. Press the product after removal from the mold.In Fig. 1 shows a mold with cavities filled with work before compression; Fig.2 is the same, after compression; Fig.3 finished floor.Mold consists of an outer tube 1 which is made from a durable material such as steel. It has 2 holes to remove excess rubber and its fixation. The internal element (pipe, the cylinder 3 may be made of metal or dielectric support member, such as fiberglass. Between them there are a number of inserts: narushenie upper 4 and lower 5 and plug 6. Educated liners cavity filled silicone rubber 7.When performing mold can change the dimensions of the cylinders, shape, number and size of inserts for a given coating 8.Example. On the Desk is installed vertically outer tube of the mold 1 and the inner bearing element, for example, fibreglass cylinder 3. Then put the inserts 5, 6, 4, and procurement of raw silicone rubber 7, pre-profilirovannye, with the excess volume of the future of the protective coating up to 10% On the lower shell 4 is installed a cylindrical punch or instead of the upper liner pokrytie 8.The number of inserts corresponds to the specified number of edges of the protective coating and the amount of the formed protective coatings in one of the mold.The mold is transferred into the working area of the press. After compression mold before closing all the bearings (Fig. 2) and flows out of the abundance of raw rubber through a special process vents 9, 10, 2 vapory, the number, size and location of which should ensure that the excess rubber, while maintaining the desired density of the resulting coating, the position of the punch is fixed by screws 11 screwed into the threaded holes 12 in the outer tube 1, the recording is the result of the setting of the screw head 11 in the annular groove 13 of the punch. Produce heating the mold to a temperature of 120oC for 20 min-the first stage of vulcanization. After that, the screw - clamps 11 turn, the mold is dismantled. Thus obtained pre-vulkanisierung product release liners from 4-6 and transferred to the final vulcanization in an oven with a temperature of 160-200oC, where stand 6-12 hoursIn the proposed method of obtaining ribbed cover, you can use metallic element in the form of a pipe element had the base and the end of cylindrical form, and the middle part in the form of a truncated cone. With this solution, the rubber coating may be seated in the dielectric load-bearing element (GRP pipe or rod) with the same taper using sealant between the rubber covering and the bearing element.To simplify the technological process it is better to use the internal dielectric load-bearing element, for example, fiberglass. And the result will be on the fiberglass hull formed a protective coating with a guaranteed quality clutch. In the case of compound dielectric support member (FRP) with protective ribbed coating of silicone rubber by nozzles of the latter with the help of adhesive sealant, the formation of air inclusions, which degrades the quality of the product.The proposed method for coating allows to obtain high quality solid protective ribbed cover height, external and internal diameters by varying the dimensions of the outer pipe, the inner element, as well as the size, shape and number of refills.The cost of silicone rubber used in the proposed method, snakeye for fiberglass insulators, when the mold having separable parts and the inner cylindrical element, is filled with organic material and carry out the vulcanization of the material, characterized in that use the mold is formed of two coaxially arranged cylinders and placed in the gap between the liners, the top and bottom of which are made permanent, and the intermediate split, as the organic material used raw organic silicon rubber and fill the mold with an organic material by a consistent set of detachable liners, and pieces of raw silicone rubber, is pressed workpiece to the clamping inserts and conduct preliminary vulcanization in the mold, then the mold is cooled and removed from the product, followed by a final cure.
FIELD: electrical engineering; insulating materials.
SUBSTANCE: proposed method for manufacturing insulating materials used in insulators and surge limiters, as well as in manufacturing pipelines, bushes, shells, bearings, wiring insulation of cases includes some additional operations; pre-drying, impregnation, and final drying of prepreg are effected in vacuum chamber and arbor is preheated before prepreg rolling up. Electric strength of prepreg produced by this method is 3.7 to 4.5 kV/mm which is much higher than that of known tubular prepregs.
EFFECT: enhanced quality of fabric surface pre-treatment, improved conditions of impregnation process.
FIELD: the invention describes the method for manufacture of a high-voltage insulator with an elongated central solid or hollow body, plastic casing and one or several plastic sheds.
SUBSTANCE: the method consists of several stager: the casing from plastic is obtained by means of casting or extrusion for the solid or hollow body; the sheds are formed from plastic; the plastic of the casing and/or the plastic of the sheds is partially stitched, and whenever necessary, the incompletely stitched plastic of the casing or shed are stitched completely, the shed is fastened on the specified place on the casing, and the obtained blank of the high-voltage insulator is stitched completely. The silicon rubber contains at least two stitching catalysts reacting at various temperatures, or at least two inhibitors suppressing the reacting of connection at various temperatures.
EFFECT: facilitated procedure.
28 cl, 3 dwg
FIELD: manufacture of column-shaped high-voltage bushing insulators.
SUBSTANCE: proposed bushing insulator has symmetrical hollow cylindrical external insulator 1 with lead-through head 2 supported by one of its butt-ends and designed for connection to high-voltage supply. Resting on opposite end of insulator is lead-through base 3 designed for connection to ground potential. Proposed method involves sequential fitting of lead-through base 3, external insulator 1, and lead-through head 2 on drawing frame 5; lead-through base 3 rests in this case on insulating case 6. Lead-through base 3 and lead-through head 2 are tightly fitted to one another through drawing frame 5 that mounts insulating case 6. Clamping member 21 made for shifting in axial direction is installed on flange 22 of lead-through head 2 prior to fitting the latter on drawing frame 5; head flange 22 and clamping member 21 are pressed against one another to produce pre-tensioning force. During next fitting of pre-tensioned lead-through head 2 clamping member 21 is secured on end of drawing frame 5 passed through insulator 1, and then clamping member 21 is taken off head flange 22 to form negative allowance.
EFFECT: enhanced economic efficiency in manufacturing high-voltage bushing insulator.
7 cl, 2 dwg
FIELD: chemical industry; methods and devices for manufacture of the electric plastic insulators.
SUBSTANCE: the invention is pertaining to the field of manufacture of the electric plastic insulators. The device for manufacture of electric plastic insulator contains the mould for manufacture of the insulating screens, which may be installed concentrically around the vertically located core or the hollow core. The mould has the field arranged below in the axial direction and fitting to the core around it or to the hollow core and the arranged above in an axial direction area, which is extending in radial direction with respect to the field arranged below in the axial direction and may be made according to the form of the being produced insulating screen. Between the end of the arranged below area in the axial direction and the upper end of the mould there is at least one injecting channel for injection of the liquid synthetic material under pressure. The method of manufacture of the electric plastic insulator is realized in several steps: a) the mold is installed in the preset axial position; b) form the a sealing coupling between the core and the mould; c)inject the liquid synthetic material under the heightened pressure with respect to the pressure of the environment; d) harden the synthetic material in the mould; e) remove the sealing joint; f) transfer the mould downwards on the preset spacing interval; h)repeat the steps b) - f) up to production of the required number of the insulating screens. The invention ensures the shorten duration of the material molding and curing, that reduces the production time of the insulators.
EFFECT: the invention ensures the shorten duration of the material molding and curing, that reduces the production time of the insulators.
12 cl, 3 dwg
FIELD: electrical engineering.
SUBSTANCE: proposed method for producing spiral skirt 2 for high-voltage insulator 1 allows for manufacture of actually cylindrical backing 3, extruder 10 incorporating extrusion head 11 that governs extrusion direction A, makes use of extruder 10 for extruding insulator skirt 2 and application of the latter onto backing 3 while rotating this backing relative to extrusion head 11. Novelty is that extrusion direction A actually coincides with longitudinal axis of backing 3; the latter is fed through extrusion head 11. Skirt manufactured by this method can be used for high-voltage insulators, high-voltage lightning arresters, or high-voltage cable entries.
EFFECT: ability of producing high-voltage parts having relatively small diameter.
12 cl, 3 dwg
FIELD: electrical engineering; polymeric insulators and their manufacturing process.
SUBSTANCE: proposed composite insulator manufacturing process includes skeleton fixation in winding mechanism that rotates it about longitudinal axis at the same time moving skeleton along its axis, production of profiled band from T-section silicone rubber band by means of extruder, installation of fin in a spaced relation between turns followed by its rolling-on. Skeleton rotating and moving mechanism is inclined relative to extruder through angle equal to that of fin inclination. Fin is thickened at least on one end of base and this end is flattened in the course of rolling to fill up clearance between adjacent turns. Then part obtained is polymerized and wiring hardware is mounted thereon.
EFFECT: facilitated manufacture, improved termination of silicone finning edge.
1 cl, 2 dwg
FIELD: electrical engineering; electrical insulators.
SUBSTANCE: protective shell is manufactured from two parts: a tube (a hose) slid over a rod or a pipe made of electrically insulating material and glued to said rod/pipe, and fins that can be glued over said tube (hose) at any intervals allowing for obtaining any leakage path length.
EFFECT: improvement of reliability and cost-effectiveness of polymer insulators.
FIELD: electrical engineering.
SUBSTANCE: invention relates to electrical engineering, particularly to the method of making high-voltage lead terminals. Channels are made in the electrically conducting element of a lead terminal, providing for access of the impregnating compound to inner layers of electric insulating material, and on the end sections, flanges are attached, which boarder the area where electric insulating material is put. After winding electric insulating material, the lead terminal is thermally processed and put into an elastic sealed sheath, on which nipple passages to its inner cavity are put, uniformly distributed along the sheath. The lead terminal is then put into an impregnating chamber, thereby joining channels in the electrically conducting element and the nipple passages with the vacuum-pressure impregnating system. Further impregnation and insulation are done at high pressure of neutral liquid in the impregnating chamber and the compound inside channels in the electrically conducting element. The neutral liquid is heated and the lead terminal is baked.
EFFECT: increased reliability and service life of lead terminals.
10 cl, 2 dwg
FIELD: electric engineering.
SUBSTANCE: invention is related to bushing insulator for supply of electric current and/or voltage. Bushing insulator (1) for supply of electric current and/or voltage via grounded plate (2), comprising axisymmetric insulating bushing (3), which surrounds central electric conductor (4). Bushing insulator has sealing part (5) for gas/liquid sealing between conductor and insulating bushing, which represents insulating paper impregnated with resin. Insulator is equipped with compressing sealing element (6), which serves as gas/liquid sealing between conductor and insulating bushing and combined with insulating bushing. Method for manufacturing of bushing insulator comprises impregnation of insulating bushing with hardening material and giving monolith shape in process of hardening with shrinkage. Sealing part is placed on part of conductor axial conductor length between insulating bushing and conductor prior to winding of insulating material.
EFFECT: invention gives possibility to avoid concentration of mechanical stresses at external edge of insulating bushing.
29 cl, 6 dwg
FIELD: electric engineering.
SUBSTANCE: device for reinforcement of suspended insulators comprises carcass with mechanism of insulators feed to working positions of rotary table installed on carcass, pressing devices with shoes coaxial to stems of working positions, interacting with vibrating sector, fixed frame with guide block installed on carcass, and also comprises horizontal platform hingedly fixed on frame with working guide block rigidly fixed on it, on horizontal platform, which is spring-loaded versus frame, there is a vibrator arranged, shoe of pressing device is equipped with pressing rubber piece having ledges that contact with insulator ribs.
EFFECT: increased applied forces of vibration and improved mechanical strength of finished insulators, reliable connection of insulator elements, sufficient seal of cement-sand adhesion and removal of air from it.
2 cl, 3 dwg