| 摘要 |
<p>A flowmeter is provided for receiving a plurality of fluid streams and providing signals representative of the mass flow rate of each stream and the differential mass flow rate of any selected pair of the streams. A housing (12) defines a flow channel to accomodate each stream to be measured. An impeller (52, 106) is rotatably mounted in each channel to impart measured angular momentum to the fluid flowing in that channel and all of the impellers (52, 106) are driven by a common turbine (34) and shaft (40). The impellers (52,106) are each resiliently coupled to the shaft (40) so that the impellers lag behind the shaft by an amount proportional to the angular momentum imparted by each impeller to the fluid in its respective channel. Pick-off means (B, D) associated with each impeller (52, 106) produce lag signals representative of the impeller lag angle and the lag signals are applied to a signal processor (200, 202, 204, 206, 208, 210, 212) that produces individual mass flow rate signals and differential mass flow rate signals representative of the difference in mass flow rate of any two selected fluid streams.</p> |
