| 摘要 |
PROBLEM TO BE SOLVED: To provide a diaphragm gas meter capable of improving the performance of instrumental error as well as stabilizing the reciprocating motion of the measuring diaphragm. SOLUTION: The gas meter body 21 comprises: the gas flow-in port and gas flow-out port; a measurement chamber 23 communicating with the flow-in port; the valve mechanism for distributing the flow-in gas from the flow-in port into the metering chamber provided in the gas meter main body; the measurement diaphragm 25 provided with a diaphragm plate 26 reciprocating by the gas pressure provided in the metering chamber; the vane shaft 29 provided freely rotatably while co-operating with the valve mechanism in the gas meter body; the rotation vane 30 for transmitting the reciprocating motion to the vane shaft as a rotational motion. The connection part comprises the hinged base 28 provided with a bearing hole 27 and hinge shaft 31 rotatably supported by the bearing hole of the hinge base provided on the rotary vane. The shape of the bearing hole is characterized by forming the true circle part 27a is made oval shaped in a bulging direction of the circular locus of the hinge shaft. COPYRIGHT: (C)2006,JPO&NCIPI
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