| 摘要 |
<p>PURPOSE:To uniform by using a branch pipe having a special resistance characteristic the suction performance developed when a concentrated piping type cleaner is used at two rooms. CONSTITUTION:The passage resistance of a branch pipe 9 has an almost equal pressure loss characteristic to that of conventional ones when flow is lower than a fixed value as indicated by dot and solid line in characteristic chart. Pressure loss rapidly increases when flow becomes higher than said fixed value. Therefore, even when the flow of one piping 8 is inclined to decrease and that of another piping 7 is inclined to increase, the resistance of the increase side one increases due to the generation of eddy current to prevent flow increase. Therefore, the suction pressure on main body side connecting pipe 9a side rises. Thanks to this high suction pressure, the effect of flow increase can be obtained on piping 8 side. Thus, the unbalance of suction force that has inconveniently occurred heretofore when a concentrated piping type cleaner is used at two rooms can be prevented by using a positive characteristic branch pipe 9 whose pressure loss characteristic has a curvature change point.</p> |
