| 摘要 |
PURPOSE: Provided is an airtight structure of an entrance in a vessel which forms an elastic airtight part at the entrance so that it keeps perfect airtight power elastically in spite of some distances between the vessel and a cover. CONSTITUTION: The airtight structure of the entrance in the vessel is characterized by comprising the parts of: an elastic airtight part(102) which is formed at the entrance(101) of the main body(100) with having a circular wheel open externally from the upper side of the entrance; an airtight part for the entrance(103) which is formed to make an outer circular side play as an airtight side; and a circular rim(104) which is placed at the lower part of the entrance to prevent the cover from being forged.
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