| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a reducer for mine ventilation with a high ventilation efficiency by connecting a second wind pipe to the small diameter side of a cylinder body and also a first wind pipe to a short straight pipe. SOLUTION: In a reducer, a short straight pipe 4 having the inner diameter b which is at least same as the inner diameter c of a front end 2 or more is arranged through a support rib 5 on the inside center of a short foreign shape cylinder body 1 whose inner diameter is different between a front end 2 (exit side) and a rear end 3 (entrance side). The air cW sent from the first wind pipe FA is dispersed to the air cW going through to the tip 2 side of the small diameter side of the reducer and the air rW backflowing toward the rear end 3 where the reducer is released after hitting to the part 1a in which the caliber of this reducer is squeezed, but the air rW from the first wind pipe FA leaked out toward the rear end side of the reducer is joined with the hot wind hW backflowing from a coal face side and poured out as the air flow of the same direction without the convection to the mine port side, while a cool wind going through to the tip 2 side flows without stress upto the tip of the second wind pipe FA.</p> |
