| 摘要 |
PURPOSE: A movable pipe connecting device is provided to connect pipes in an airtight manner using a plurality of joints and prevent the separation of the pipes. CONSTITUTION: A movable pipe connecting device comprises first and second main pipes(101,102) and a coupling unit(100) which airtightly connects the main pipes to control relative extension and expansion and prevents the separation of the main pipes. The coupling unit comprises first and second coupling pipes which are arranged separate from each other and airtightly connected to the respective first and second main pipes, a groove joint which airtightly connects the first and second coupling pipes, and an orifice plate(180) which is arranged in a gap between the first and second coupling pipes to prevent the first and second coupling pipes from being biased against extension and expansion.
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