Method for preparing carbon fibre braided packing

Abstract

The invention relates to a method for preparing braided packing, in particular to a method for preparing carbon fiber braided packing, which mainly aims to solve problems of causing equipment to be frequently shutdown for inspection and affecting the normal operation of the production due to low tensile strength, easy scouring during the use, short service life, and the need of frequent replacement existing in the prior art. The method also solves the technical problems that certain materials with better strength have no electric conductivity and heat conductivity and can be overheated and burnt when the materials are used under working conditions of high pressure, high temperature and high speed, thereby easily producing dielectric leakage, frequently causing process shutdown, bringing great loss to the production and economy and so on. The method comprises the steps: the adoption of a polyacrylonitrile fiber, constant-temperature filament unwinding, multi-stage pre-oxidation, middle-temperature carbonization, the protection of high temperature carbonization by a micro-oxygen carbon corrosion method, sizing, filament winding, one-step carbon filament pretreatment, pipe inversion, the adjustment of spindle tension, fixed temperature constant control braiding, negative pressure filling and soaking, drying, shaping, inspection, packing and warehouse entry.

Description

technical field [0001] The invention relates to a preparation method of braided packing, in particular to a preparation method of carbon fiber braided packing. Background technique [0002] There are many throttling, supply and discharge devices in industrial equipment, such as pumps, reciprocating shafts, valves, etc. The working parts of these equipments are all required to have a good seal to prevent the internal medium from leaking, and the sealing of the moving parts is often the most likely to fail, especially in some severe working conditions. Often in industrial production, more than 60% of the accidents are related to the lax sealing of equipment and the leakage of internal media. [0003] Especially for dynamic sealing under complex working conditions such as high temperature, high pressure, high speed, and strong corrosion, it is difficult to find an ideal packing product to ensure the efficient operation of our equipment. What kind of packing can be used to meet...

AI Technical Summary

Problems solved by technology

[0005] However, in the products prepared by this preparation method and the current graphite braided packing, when rotating at high pressure and high speed, due to the poor continuity of the manufacturing process of the material itself, the tensile strength is not high, it is easy to wash out during use, and the life under high pressure and high speed It is very short and needs to be replaced frequently, causing the equipment to be shut down frequently and waiting for inspection, which affects the normal operation of production

There are also some materials with better strength, such as aramid fibers, polytetrafluoroethylene fibers, etc., which do not have electrical and thermal conductivity. Heat energy cannot be conducted, so it will cause overheating and burning, and it is easy to cause medium leakage, which often causes process shutdown and brings a lot of losses to production economy.