Sealing structure suitable for high-pressure plastic inner container carbon fiber full-winding gas cylinder and application

Abstract

The invention discloses a sealing structure suitable for a high-pressure plastic inner container carbon fiber full-winding gas cylinder. The sealing structure comprises an annular inner cylinder body and an annular outer cylinder body which are coaxial, wherein the outer cylinder body is provided with an annular base which matching with the shoulder portion of the inner container needing to be sealed, an annular hollow structure in the middle is arranged between the inner cylinder body and the outer cylinder body and is used for embedding a bottle neck of the inner container needing to be sealed, a sealing groove is formed in the side, making contact with a bottle neck of the inner container needing to be sealed, of the inner barrel, and a sealing piece is arranged in the sealing groove to prevent gas from leaking from a gap between the inner barrel and the bottle neck of the inner container needing to be sealed, and a plurality of grooves matching with flanges on the outer surface of the inner container to be sealed are formed in the inner side of the base of the outer cylinder body. According to the sealing structure, the sealing reliability and stability of a high-pressure gas storage cylinder can be greatly improved, gas leakage caused by fatigue failure under the use working condition is avoided, meanwhile the sealing device has the advantage of being easy and convenient to assemble, and the sealing structure can be applied to a vehicle-mounted high-pressure hydrogen storage bottle.

Description

technical field [0001] The invention belongs to a sealing structure, and relates to a sealing structure suitable for high-pressure gas cylinders, in particular to a sealing structure suitable for high-pressure plastic liners and carbon fiber fully wound gas cylinders. Background technique [0002] In recent years, with the rapid advancement of the commercialization of fuel cell vehicles, the mileage and cost factors of vehicles have gradually been paid attention to. The high-voltage on-board hydrogen storage system, especially the on-board high-pressure hydrogen storage bottle, is the key factor affecting the performance and cost of the vehicle. one. my country has realized the mass production of 70MPa aluminum alloy liner carbon fiber fully wound hydrogen storage cylinders (Type III cylinders), but the 70MPa Type III cylinders have low hydrogen storage weight specific density and high manufacturing costs, which hinder their use in fuel cell vehicles. The batch application o...

AI Technical Summary

Problems solved by technology

The disadvantages of this structure are: the sealing reliability is not high, there is no sealing structure design between the metal bottle mouth and the injection molded part, the two are integrated injection molding, only rely on the combination in the injection molding process, the modulus of metal and plastic is different, Under the condition of repeated charging and discharging of gas cylinders, there is peeling off of metal and injection molded parts, resulting in the hidden danger of hydrogen leakage

The disadvantages of this structure are: the design is complicated, but it is still unable to coordinate the disguised amount of plastic and metal, and the metal bottle mouth must be integrally formed with the plastic liner, which increases the difficulty of making the liner

However, the main reason for the leakage of hydrogen gas from the mouth of the plastic liner hydrogen storage bottle is the fatigue failure caused by the repeated filling process of the gas cylinder, which leads to the peeling off of the metal bottle mouth and the plastic liner that were originally tightly combined. At the same time, because of the plastic The elastic strain is much greater than that of the metal, which will lead to a large difference in deformation under high-pressure hydrogen conditions, so that the original sealing ring between the two is insufficient in deformation, resulting in hydrogen leakage

Moreover, the existing patented bottle mouth sealing structure design does not consider the influence of the opposite torque force on the damage of the sealing structure during the cylinder valve loading and unloading process when the gas cylinder is in use.

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