Rotary joint for ultra-low temperature

Abstract

A rotary connector specially used at an ultralow temperature comprises an outer ring which is mounted on an inner ring in a sleeved mode. An upper flange is arranged on the inner ring, and a lower flange is arranged under the inner ring. The upper flange is fixedly connected with the inner ring, and the lower flange is fixedly connected with the outer ring. A bushing is arranged inside the inner ring, and a heat insulation cavity is formed between the bushing and the inner ring. Main sealing devices are mounted between the bushing and the upper flange and between the bushing and the lower flange. A nitrogen purging channel is arranged between the outer wall of the inner ring and the inner wall of the outer ring. Two annular steel ball rolling paths are arranged on the nitrogen purging channel. A plurality of bearing balls are mounted in the annular steel ball rolling paths and can be used for realizing independent rotation of the inner ring and the outer ring. According to the rotary connector specially used at the ultralow temperature, nitrogen is blown into a nitrogen inlet in the inner ring, enters the heat insulation cavity, passes through a nitrogen passing hole and enters the nitrogen purging channel, water vapor generated in the nitrogen purging channel and the heat insulation cavity is discharged out from a nitrogen outlet, and therefore the situation that the water vapor freezes in the steel ball rolling paths to prevent rolling of the bearing balls is avoided.

Description

technical field [0001] The invention relates to a key part of liquid conveying equipment, in particular to a special rotary joint for ultra-low temperature. Background technique [0002] Rotary joints refer to the connection and sealing devices where fluid media (heat transfer oil, steam, water, air, etc.) are input from stationary pipes to rotating equipment. At present, the transfer of liquid medium is often completed through the liquid loading and unloading arm between the shipping freighter and the wharf, and the swivel joint is the key component of the loading and unloading arm. For low-temperature media such as liquefied natural gas and low-temperature ethylene, on the one hand, it will affect the service life of the inner ring of the rotary joint. The steel ball raceway will cause serious consequences, so how to make the rotary joint work normally at low temperature is particularly important. Contents of the invention [0003] The technical problem to be solved by...

AI Technical Summary

Problems solved by technology

For low-temperature media such as liquefied natural gas and low-temperature ethylene, on the one hand, it will affect the service life of the inner ring of the rotary joint. The steel ball raceway will cause serious consequences, so how to make the rotary joint work normally at low temperature is particularly important

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