| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a back fire preventing device, suitably preventing back fire due to detonation wave and also reducing the manufacturing cost. <P>SOLUTION: An upstream passage part 1 for pouring combustible gas from the upstream side and a downstream passage part 2 for pouring combustible gas to the downstream side are connected to each other with bending of 90° to 180°. A flash reducing area where detonation wave does not exist to back fire due to detonation wave from the downstream passage part 2 is formed by an acute angle part 7 provided on the bending inside position at the upstream side end of the downstream passage part 2. A bending passage part 3 is provided so that the flash reducing area is formed to cover the downstream end of the upstream passage part 1, and further a back fire preventing unit 8 is disposed in the flash reducing area of the upstream passage part 1. <P>COPYRIGHT: (C)2013,JPO&INPIT |
