Piping connection structure and connection member

Abstract

A piping connection structure includes: a first connection member having a receiving port and a first pipe connection portion; a second connection member having an insertion port and a second pipe connection portion; and a lock mechanism configured to maintain an inserted state in which the insertion port is inserted into the receiving port and to allow relative rotation of the first connection member and the second connection member about an axis. The lock mechanism includes: an annular lock groove continuously provided in a circumferential direction at an outer peripheral surface of the insertion port; a pair of slits extending in the circumferential direction and provided in a peripheral wall of the receiving port so as to face each other; a pair of pin portions disposed at opposite sides of the receiving port and respectively inserted into the lock groove via the pair of slits; and a restraining portion provided in each slit and configured to restrain movement of the corresponding pin portion in a direction in which the pin portion comes out of the lock groove, by abutting the pin portion.

Images