| 摘要 |
PROBLEM TO BE SOLVED: To provide a water meter having a large effect of reducing a pressure loss in comparison with a prior art. SOLUTION: A meter case 4 of the water meter 1 is configured so that an upstream-side channel 6, an annular channel 7A and a downstream-side channel 7B are formed in a partitioned fashion therein, and a rectifier 23 is fit in and coupled with a circular aperture 9 used for connecting the channels, and a cylindrical wall 14 is attached in order to form a metering chamber 17 at the upper end of the rectifier. The circular edge 14a of the cylindrical wall 14 faces a lower plane portion 20a of a shaft accommodating part 20 which is disposed above it, and water flows out through a gap G between the circular edge 14a and the lower plane 20a. The circular edge 14a is in a tilt shape descending from the downstream side toward the upstream side, and the water tends to flow out on the upstream side in comparison with the downstream side, since the gap G is larger in height at the upstream side. Accordingly, the water flow can be spread to the upstream side without converging it on the downstream side, thereby uniformizing the water flow in the channels and reducing the pressure loss caused by the water meter 1. COPYRIGHT: (C)2010,JPO&INPIT
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