An annular pipe sealing ring for ultra-low temperature dynamic sealing and its processing method

Abstract

The invention discloses an annular pipe sealing ring used for ultralow-temperature dynamic sealing. The annular pipe sealing ring comprises a pipe and a group of air inlet holes, wherein the pipe is provided with a hollow cavity, and the air inlet holes are formed in the pipe. The pipe is annular, and the hollow cavity of the pipe is internally provided with a supporting piece. The sealing ring with the design can be made of a relatively flexible low-temperature-resistant material, and the sealing effect is ensured; meanwhile, the annular pipe sealing ring not only can be used for static sealing and sliding sealing under an ultralow-temperature working condition but also can be used for dynamic sealing under the ultralow-temperature working condition; when no fluid pressure exists in the inner cavity, the thin-wall pipe is supported through stable supporting force provided by the supporting piece inside the inner cavity, and crushing and failure of the pipe are prevented; when high-pressure fluid enters the inner cavity of the pipe and the pressure difference is produced, the thin-wall pipe has enough deformation capability, can be closely attached to the metal surface and is good in sealing effect; and in addition, when the two sealing end surfaces are relatively separated, the sealing ring has enough strength to bear the pressure difference alone, and breaking caused by pulling, bursting and failure are avoided.

Description

technical field [0001] The invention relates to the technical field of ultra-low temperature fluid sealing, in particular to an annular pipe sealing ring used for ultra-low temperature dynamic sealing. Background technique [0002] The ultra-low temperature sealing ring is mainly used for the sealing of ultra-low temperature fluids, such as LNG, liquid hydrogen, liquid oxygen and liquid nitrogen, etc. It can be used for the sealing of ultra-low temperature storage tanks and filling ports of LNG vehicles and ships, and the liquid fuel storage of rockets and aviation aircraft. Sealing of tanks and fuel lines, and other occasions where cryogenic sealing is required. [0003] The most common type of ultra-low temperature sealing rings in the market is the O-ring. The disadvantage of this type of sealing ring is that the sealing rings made of materials with good sealing effect, such as fluorine rubber, nitrile rubber or silica gel, cannot withstand Ultra-low temperature, its ela...

AI Technical Summary

Problems solved by technology

[0005] However, this semi-open ultra-low temperature sealing ring with a built-in metal spring ring has the following disadvantages: it is mainly suitable for static sealing and sliding sealing, and it cannot be applied to dynamic sealing

Because when the two sealing end faces are separated from each other, the pressure in the opening is greater than the pressure on the back of the seal, and the two lips 103 of the outer ring 101 will be tightly attached to the sealing end faces by the pressure. With the separation of the sealing end faces, the outer ring 101 The two lips 103 are burst and torn, causing the sealing ring to fail

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