Double Casing Water Meters

A double casing water meter includes a casing having an inlet port, a water chamber in fluid communication with the inlet port, an outlet port and a water discharging chamber in fluid communication with the outlet port. An inner casing has a bottom plate defining at least one water inflow passage extending between the water chamber and the water discharging chamber, and a water inflow tube opening at its opposed ends respectively into the water inflow passage and the water chamber and inclined relative to the bottom plate. A vane wheel is supported for rotation in the casing upon issuance of water from the water inflow passage and has individual vanes successively disposed in intersecting relation to the longitudinal axis of the tube in the course of the vane wheel rotation.

1. A double casing water meter comprising:

an inlet port and an outlet port, a water chamber, an inner lower casing having a circular bottom plate with one or more water inflowing holes and one or more water inflowing tubes in fluid communication with said water inflowing holes and a cylindrical wall with one or more water discharging holes, and a vane wheel with a plurality of vane blades mounted within said inner lower casing, wherein each of said vane blades has a concave portion with an inclined surface perpendicular to the longitudinal axis of said water inflowing tubes, characterized in that the water inflowing from said inlet port flows via said water chamber and through said water inflowing tubes into said inner lower casing, the inflowing water thereby running against said concave portion and at the same time against said inclined surfaces of said vane blades, at a right angle to generate turning force on said vane wheel, and flows out via said water discharging holes and through said outlet port.

2. A double casing water meter according to claim 1 wherein said cylindrical wall is vertically arranged on the upper side of said bottom plate along the circumference spaced at a predetermined distance from the peripheral edge of said bottom plate, and a plurality of water discharging holes are provided, at predetermined intervals, around said cylindrical wall, the lower surface of said holes being at the same level with said bottom plate, and wherein said bottom plate has one or more intercepting protrusions each provided on the respective front ends of said water inflowing holes, each intercepting protrusion having a small narrow recess formed thereinto along the outer edge of said water inflowing holes.

3. A double casing water meters according to claim 1 wherein said vane wheel comprises a plurality of vane blades integrally formed therewith, each blade being curved to form a concave portion for enveloping the inflowing water from said water inflowing holes through said inclined water inflowing tubes and at the same time being inclined to form an inclined surface perpendicular to the longitudinal axis of the inclined water inflowing tubes.