CN-115346741-B - Post insulator manufacturing method

Abstract

The invention discloses a manufacturing method of a post insulator, which comprises the following steps of providing a hollow insulating tube and two flanges, wherein the inner diameter of each flange is slightly smaller than the outer diameter of the hollow insulating tube, coating umbrella skirts outside the hollow insulating tube integrally, pressing and fixing the two flanges and two ends of the hollow insulating tube through interference fit respectively, and sealing the gaps between the flanges and the hollow insulating tube to obtain the post insulator, wherein the flanges are fixed through interference fit, and the flanges are sealed ④. The method for manufacturing the post insulator is simple and convenient, convenient to manufacture, low in manufacturing cost and high in production efficiency, and improves the connection strength of all parts of the post insulator.

Inventors

• MA BIN
• LIU CHAO
• ZHOU SHUCHEN
• YANG MENG
• YU JIE
• HUANG QING

Assignees

• 江苏神马电力股份有限公司

Dates

Publication Date

20260512

Application Date

20210514

Claims (7)

1. 1. A manufacturing method of a post insulator comprises the following steps: ①, providing a hollow insulating tube and two flanges, wherein the inner diameter of each flange is slightly smaller than the outer diameter of the hollow insulating tube, each flange comprises a flange cylinder and a flange plate, one end of each flange cylinder is sealed by each flange plate, a first sealing groove is formed in the surface of each flange plate, facing the hollow insulating tube, of each flange plate, and a second sealing groove adjacent to each flange plate is formed in the inner wall of each flange cylinder; ②, integrally coating umbrella skirts outside the hollow insulating tube; ③, press-fitting and fixing the two flanges with the two ends of the hollow insulating tube respectively through interference fit, wherein the two flanges are directly sleeved at the two ends of the hollow insulating tube, an insulating medium in the hollow insulating tube is ambient air, and the air pressure value in the hollow insulating tube is consistent with the production ambient air pressure value when the post insulator is prepared, so that the air pressure relative value in the hollow insulating tube is 0MPa; before the step, a first sealing element is arranged in the first sealing groove, a second sealing element is arranged in the second sealing groove, a plurality of inner annular grooves and a plurality of circulation grooves communicated with the inner annular grooves are arranged on the inner wall of the flange cylinder at intervals along the axial direction of the flange cylinder, the ratio range of the length of the inner wall of the flange cylinder to the length of the hollow insulating tube contact part to the outer diameter of the hollow insulating tube is 0.2-1.0 along the axial direction of the post insulator, and an adhesive is filled in the inner annular grooves and the circulation grooves so as to fixedly connect the flange cylinder and the hollow insulating tube; And ④, sealing the gap between the flange and the hollow insulating tube to obtain the post insulator.
2. 2. The post insulator of claim 1, wherein the width of the first seal groove is maintained constant or gradually decreases in a direction approaching the hollow insulating tube, and an adhesive is coated in the first seal groove and/or on the first seal member.
3. 3. The post insulator of claim 1, wherein prior to said step ③, a desiccant device is provided on a disk surface of said flange facing said hollow insulator tube, said desiccant device comprising a cage-like desiccant cartridge and a desiccant disposed within said desiccant cartridge, said desiccant cartridge having a through-hole disposed at an outer periphery thereof.
4. 4. A post insulator according to claim 3, wherein the desiccant is placed directly in the cage-like desiccant cartridge and the desiccant device is secured to the flange.
5. 5. The method of manufacturing a post insulator of claim 4, wherein the desiccant is packaged in a cloth bag.
6. 6. The method of manufacturing a post insulator of claim 1, wherein an adhesive is applied to an outer wall of the hollow insulator tube and/or an inner wall of the flange cylinder prior to the step ③.
7. 7. The method of manufacturing a post insulator of claim 6, wherein after said step ③, said hollow insulator tube is heat cured and cooled in a region where said flange is press-fitted and fixed.

Description

Post insulator manufacturing method Technical Field The invention relates to the technical field of power transmission and transformation and offshore wind power new energy insulation equipment, in particular to a manufacturing method of a post insulator. Background The post insulator in the industry at present comprises the following technical routes that ① porcelain insulators are coated with room temperature vulcanized silicone Rubber (RTV) paint, ② porcelain core composite post insulators, namely umbrella skirts and core rods are made of silicone rubber, ③ solid composite post insulators, namely composite material solid cores, ④ hollow composite insulators are filled with solid insulating media, ⑤ hollow composite insulators are filled with pressure gas, and three outer insulating umbrella covers are made of silicone rubber materials. In order to improve the mechanical properties of the post insulators, a method for manufacturing the post insulators is required to strengthen the connection between the parts of the post insulators. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a manufacturing method of a post insulator, which has the advantages of simple and convenient manufacturing process, low manufacturing cost and high production efficiency, and improves the connection strength of all parts of the post insulator. The technical means adopted by the invention is that the post insulator manufacturing method comprises the following steps of providing a hollow insulating tube and two flanges, wherein the inner diameter of each flange is slightly smaller than the outer diameter of the hollow insulating tube, coating umbrella skirts outside the hollow insulating tube integrally, fixing the two flanges and two ends of the hollow insulating tube through interference fit press fitting respectively, and sealing gaps between the flanges and the hollow insulating tube to obtain the post insulator, wherein the step ③ comprises the step ①. Preferably, the flange comprises a flange cylinder and a flange plate, and the flange plate seals one end of the flange cylinder, so that two ends of the hollow insulating tube are in a closed state, and impurities such as water vapor and the like are prevented from entering the inside of the post insulator. The flange is a closed flange, punching is not needed, processing is convenient, and sealing performance is good. Preferably, a first sealing groove is formed in the surface, facing the hollow insulating tube, of the flange plate, and before the step ③, a first sealing piece is arranged in the first sealing groove, so that a gap is reserved between the hollow insulating tube and the flange barrel, and external water vapor is prevented from entering the hollow insulating tube, and sealing between the hollow insulating tube and the flange is affected. Preferably, the width of the first sealing groove is kept constant or gradually becomes smaller in a direction approaching the hollow insulating tube, and an adhesive is coated in the first sealing groove and/or on the first sealing member to prevent the first sealing member from falling off. Preferably, before step ③, a drying device is disposed on the disk surface of the flange facing the hollow insulating tube, for removing moisture in the post insulator, where the drying device includes a cage-shaped drying agent box and a drying agent disposed in the drying agent box, and a through hole is disposed at an outer periphery of the drying agent box to absorb moisture. Preferably, the desiccant is placed directly in a cage-like desiccant cartridge and the desiccant device is secured to the flange. Preferably, the desiccant is packaged in a cloth bag. Preferably, prior to step ③, an adhesive is applied to the outer wall of the hollow insulating tube and/or the inner wall of the flange cylinder. Preferably, in step ③, two flanges are directly sleeved on two ends of the hollow insulating tube, and the insulating medium in the hollow insulating tube is ambient air. Preferably, after step ③, the area where the hollow insulating tube is press-fitted and fixed with the flange is heated, solidified and cooled. The application has the advantages that the hollow structure of the post insulator is different from the prior art, namely, the core body of the post insulator adopts the hollow insulating tube, and the inside of the hollow insulating tube is provided with the ambient air, so that on one hand, the problem that the post insulator has crack defects and interfaces caused by filling solids is avoided, and the electric performance of the post insulator is influenced, and on the other hand, the flange of the post insulator is not required to be provided with an air filling device because the ambient air is not filled by the air filling device, and then the step of air filling is omitted, such as an air filling valve and the like, so that the structure is simplified, the cost is reduced, compa