| 摘要 |
PROBLEM TO BE SOLVED: To surely prevent a tightening nut from being getting loose, without worsening sealing performance between a connecting pipe member and a connection nozzle fixed by the tightening nut. SOLUTION: This pipe connection device includes a nipple (4) connected to the connection nozzle (3), and the tightening nut (6) screwed onto an attaching screw (5) formed in the connection nozzle (3). A diameter-expanded part (10) is provided in one end side of the nipple (4), and the tightening nut (6) is fit around the diameter-expanded part (10). The tightening nut (6) is advanced screwedly to press the diameter-expanded part (10) onto the connection nozzle (3). An engaging part (13) is provided in the connection nozzle (3), and a locking part (12) is provided in the diameter-expanded part (10). The locking part (12) is engaged with the engaging part (13) to make the nipple (4) turn-incapable. A fixing male screw part (15) is formed on an outer circumferential face of the nipple (4), and a connection-fastening nut (17) is arranged in an opposite side opposite to the diameter-expanded part (10) with the tightening nut (6) therebetween, to be fixed to the fixing male screw part (15). COPYRIGHT: (C)2010,JPO&INPIT
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