High-temperature high-pressure vacuum nozzle and sealing method thereof

Abstract

The invention relates to a high-temperature high-pressure vacuum nozzle and a sealing method thereof. The high-temperature high-pressure vacuum nozzle comprises a clamp nut, a compression ring, a pipe joint and a base plate, wherein the base plate is of a truncated cone structure, the upper surface of the base plate is processed with one, two or three circular grooves, the lower surface of the compression ring is processed with tenons which are matched with the circular grooves, a plurality of layers of film gaskets are arranged between the matching surfaces of the base plate and the compression ring, each film gasket is of a sheet structure with holes in the middle, is 0.05-0.1mm in thickness, and is made from nylon, fluoroplastic or polyimide. By processing one to three sealing grooves on the upper surface of the truncated cone of the base plate and the matched tenons on the lower surface of the compression ring, the high-temperature high-pressure vacuum nozzle plays the effect of asealing gasket as the flexible film gaskets can necessarily deform under the pressing force, realizes the mechanical sealing between the compression ring and the base plate by the compression force of the nut and the deformation of the film gaskets, and is able to resist high temperature of 300 DEG C and above and pressure of 1.0MPa or above. The vacuum nozzle provided by the invention is made ofmetal materials, and the film gaskets are made from materials which have the temperature grade higher than or equal to the film material of vacuum bags and can meet requirements on molding process ofhigh-temperature resistant composite autoclaves.

Description

technical field [0001] The present invention relates to a vacuum nozzle and a sealing method, in particular to a vacuum nozzle and a sealing method for sealing a vacuum bag resistant to high temperature and high pressure (temperature > 300°C, pressure > 1.0MPa) used in a resin-based composite autoclave molding process. It belongs to the technical field of autoclave forming. Background technique [0002] The vacuum bag / autoclave molding process is still the molding process for high-quality resin-based composite components. Reliable sealing of vacuum bags is an essential link and prerequisite for this process. The vacuum nozzle is the joint part of the vacuum bag system. Its function is to connect the vacuum bag system and the vacuum system of the autoclave through the metal vacuum pipeline, and ensure that the specified vacuum is maintained in the vacuum bag system under the high temperature and high pressure outside the vacuum bag. To achieve effective compaction of ...

AI Technical Summary

Problems solved by technology

The shortcomings of the existing technology are that the silicone rubber plate is aging and cracked under the condition of high temperature and high pressure for a long time, loses the necessary strength and elasticity, and even forms through holes, resulting in vacuum leakage of the vacuum bag system, and the compaction of the components cannot be realized. eventual scrapping of components

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