Rotary joint special for ultralow-temperature liquid hydrogen

Abstract

The invention relates to the technical field of ultralow-temperature fluid medium corollary equipment, in particular to a rotary joint special for ultralow-temperature liquid hydrogen. The rotary joint comprises an inner ring, an outer ring and a flange. According to the rotary joint special for ultralow-temperature liquid hydrogen, the structure is designed into a double-layer structure, the interior of the rotary joint is provided with a liquid hydrogen medium channel, an interlayer is vacuumized, inert gas is introduced into a gap between roller paths, and the energy transfer area is reduced through the jacket vacuumizing structure; the inner ring of the rotary joint is designed into a jacket structure, so that the roller paths and steel balls are separated from an internal ultralow-temperature medium through a jacket space, the energy transfer area is reduced, the influence of the low-temperature medium in the joint on the roller paths is reduced, and the influence of low-temperature shrinkage borne by a rotary shaft is greatly reduced; and the rotary joint is designed to be of a jacket structure, a jacket space is subjected to vacuumizing, inert gas is introduced into the gap of the roller paths for replacement, the content of water in the working environment of the rotary joint is reduced, and it is ensured that the roller paths of the joint cannot be frozen.

Description

technical field [0001] The invention relates to the technical field of supporting equipment for ultra-low temperature fluid media, in particular to a special rotary joint for ultra-low temperature liquid hydrogen. Background technique [0002] The most critical part of the fluid loading and unloading arm is the rotary joint. With the needs of industrial development, at present, new energy --- liquid hydrogen medium will become the future development trend, but the normal working temperature of liquid hydrogen medium is -253 ℃, conventional The lowest operating temperature of cryogenic rotary joints is -196°C, so conventional low temperature rotary joints are no longer applicable. [0003] First of all, when the liquid hydrogen medium is working, the liquid hydrogen medium flowing inside the rotary joint is -253°C, and the metal outer surface of the conventional low-temperature rotary joint is at ambient temperature. Through the physical phenomenon of energy transfer, the tem...

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Problems solved by technology

[0003] First of all, when the liquid hydrogen medium is working, the liquid hydrogen medium flowing inside the rotary joint is -253°C, and the metal outer surface of the conventional low-temperature rotary joint is at ambient temperature. Through the physical phenomenon of energy transfer, the temperature of the outer surface of the rotary joint will continue to decrease. When the temperature of the outer surface of the joint is lower than -183°C, the oxygen in the air will form liquid oxygen on the metal outer surface of the rotary joint. As the liquid oxygen continues to increase, it will fall in the field environment, making the oxygen concentration in the field environment continue to increase. High oxygen concentration is not only harmful to human health, but also easily creates a flammable and explosive environment

[0004] Second, the rotation of conventional low-temperature rotary joints also relies on the relative rotation of the rotary bearings composed of the inner ring and outer ring of the rotary joint and steel balls. Under ultra-low temperature conditions, the material is easy to shrink and deform. When the materials of the inner and outer rings and steel balls shrink When the amount is inconsistent, it will affect the sensitivity of the bearing rotation

Affects rotation of swivel joint bearings

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