AIR ESCAPE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an air escape device capable of buffering the positive pressure/negative pressure of a blocked area by bringing about the efficient flow of air in the blocked area of a drain pipe.;SOLUTION: An air escape body 20 can be deformed in such a shape as to be put into an expanded state in which an internal space is expanded by the positive pressure so as to bring about the escape of the air in the blocked area C, when the positive pressure is generated in the blocked area C formed in the drain pipe between first and second seal-water portions, or a contracted state in which the internal space is contracted by the negative pressure so that the air taking shelter in the internal space can be discharged into the blocked area C, when the negative pressure is generated in the blocked area C.;COPYRIGHT: (C)2008,JPO&INPIT