| 摘要 |
PROBLEM TO BE SOLVED: To provide an axial flow impeller-type water meter, capable of efficiently adding up the volume correctly by acting fluid pressure on an impeller, especially in domains of little fluid flow, while maintaining instrumental error performance in region of high fluid flow amount. SOLUTION: The axial flow impeller-type water meter where a rectifier 5 is prepared on the upstream side of inside a case 1 with an inflow port 2 at an end and an outflow port 3 at the other end and an impeller 6, rotating in response to fluid pressure of fluid, is prepared at the downstream side, is characterized in that it comprises the rectifier 5 of rectifier hub 7 and a flowing channel 4 established on the periphery of this rectifier hub 7, by comprising the impeller 6 of an impeller hub 16 having an impeller shaft 15, a flowing channel 4 established at the periphery of the impeller hub 16, and a plurality of impellers 17 having a tilting blade plane 17a tilted with respect to the impeller shaft 15, while projecting radially from the outer peripheral surface of the impeller hub 16, and by installing a fluid-inducing grooves 21 and 22 orienting the fluid flowing from the upstream to the downstream of the flowing channel 4 to the blade plane 17a of the impeller 6, on the rectifier hub 7 and the outer peripheral surface of the impeller hub 16. COPYRIGHT: (C)2007,JPO&INPIT
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