Rotating joint special for ultra-low temperature fluid loading arm

Abstract

Disclosed is a rotating joint special for an ultra-low temperature fluid loading arm. An inner ring is sleeved with an outer ring. A left flange is connected with the left end of the inner ring. A right flange is fixedly connected with the outer ring. A thermal insulating cavity is formed in the inner ring. A nitrogen purging channel is arranged between the inner ring and the outer ring and provided with an annular roller path. A ball valve capable of enabling the inner ring and the outer ring to rotate independently is mounted in the annular roller path. The left flange is provided with a left nitrogen channel, the inner ring is provided with an inner nitrogen channel, the left flange is provided with a nitrogen inlet, and the inner ring is provided with two nitrogen via holes. The right flange and the outer ring are provided with a right nitrogen channel, the right flange is provided with a nitrogen outlet, and the outer ring is also provided with nitrogen via holes. An open type nitrogen channel is formed by the nitrogen inlet, the left nitrogen channel, the nitrogen via holes of the inner ring, the thermal insulating cavity, the nitrogen purging channel, the nitrogen via holes of the outer ring, the right nitrogen channel and the nitrogen outlet sequentially. By means of the rotating joint, the inner ring and the outer ring can rotate independently, so that the nitrogen circulation is improved and moisture is easy to bring out and discharge into the atmosphere.

Description

technical field [0001] The invention relates to a key component of ultra-low temperature liquid transport equipment, in particular to a special rotary joint for unloading arms of liquefied gas at ultra-low temperature, and belongs to the technical field of ultra-low temperature liquefied gas transport. Background technique [0002] At present, the transportation of liquefied gas between the shipping freighter and the wharf is often completed through the fluid loading and unloading arm, and the rotary joint of the loading and unloading arm is the "heart" of the entire loading and unloading arm. It is not only the flow channel of the liquid medium, but also the loading and unloading arm. An important structural component that realizes all-round connection in space, the quality of the rotary joint directly determines the value and service life of the entire loading arm. The ultra-low temperature transportation of liquefied natural gas and low-temperature ethylene will not only ...

AI Technical Summary

Problems solved by technology

The ultra-low temperature transportation of liquefied natural gas and low-temperature ethylene will not only affect the life of the inner ring of the rotary joint, but also cause the water vapor accumulated in the rotary joint to freeze due to the low temperature, which will damage the inner raceway of the joint and cause serious consequences

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