Ultra-low-temperature two-way static sealing structure

Abstract

The invention provides an ultra-low-temperature two-way static sealing structure. The ultra-low-temperature two-way static sealing structure comprises a shaft, a first shaft sleeve, a second shaft sleeve, a sealing ring and a locking nut, wherein the shaft comprises a first shaft segment with a thread, a second shaft segment connected to the first shaft segment, and a third shaft segment with thediameter larger than that of the second shaft segment and connected with the second shaft segment. The first shaft sleeve is provided with a first sealing bulge, and arranged on the second shaft segment. The second shaft sleeve is provided with a sealing groove, arranged on the second shaft segment, and thesecond shaft sleeve is adjacent to the first shaft sleeve. The sealing ring is located in the sealing groove, arranged on the second shaft segment, and used for sealing the first shaft sleeve and the second shaft sleeve. The locking nut is arranged at the thread in the first shaft segment, and used for tightly twisting the first shaft sleeve and the second shaft sleeve on the second shaft segment. According to the ultra-low-temperature two-way static sealing structure, two-way sealing inthe axial direction and the radial direction under the ultra-low-temperature environment can be realized, the sealing effect is remarkable, and the phenomenon of untight sealing due to the change ofthe environmental temperature can be avoided.

Description

technical field [0001] The invention relates to the field of sealing technology, in particular to a bidirectional static sealing structure, in particular to an ultra-low temperature bidirectional static sealing structure. Background technique [0002] The shaft sleeve static seal is a key structure in the liquid rocket engine turbine impeller. There must be a reliable dynamic seal and static seal structure between the oxidant pump and the fuel pump to prevent the oxidant and fuel from meeting. The sealing between the shaft sleeves and between the shaft sleeve and the shaft is an urgent problem to be solved. Once the oxidant and fuel leak through the fitting gap between the shaft sleeve and the shaft, the oxidant and fuel will meet and explode. Therefore, the static sealing structure of the shaft sleeve must be designed to prevent the encounter of the oxidant and the fuel. [0003] In the prior art, the static sealing structure of the liquid rocket engine usually includes a...

AI Technical Summary

Problems solved by technology

Among them, the elasticity of the rubber O-ring will decrease sharply in the ultra-low temperature (below -50°C) environment, or even disappear, resulting in seal failure, so it cannot be used for static sealing of the ultra-low temperature shaft sleeve; the flexible graphite pad has a layered structure and can only be used as a unidirectional static seal; F4 gasket has "cold flow" (creep), that is, when it exceeds a specific compression stress, permanent plastic deformation will occur, and because of its large linear expansion coefficient, it is likely to cause seal failure in an ultra-low temperature environment ;Under a specific pressure, the diameter deformation of the sealing aluminum gasket of the ordinary structure is limited, and it is difficult to achieve axial and radial bidirectional sealing

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