Bi-directional fluidic oscillator flow meter
AssigneeElster Metering Limited
InventorsMichael L. Sanderson, Patrick C. J. Harvey, Thomas P. Doyle, Jon C. Scott
Life of this patent
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Abstract
A flow tube for a bidirectional flow meter comprises a first means (for example in the form of a first flow chamber) for generating a periodic pressure fluctuation whose frequency varies in dependence on the flow rate of fluid through the meter in a first direction; and a second means (for example in the form of a second flow chamber) for generating a periodic pressure fluctuation whose frequency varies in dependence on the flow rate of fluid through the meter in a second direction, opposite to the first direction; wherein said first and second generating means are connected in series between an inlet port and an outlet port.
Claims40
-95. (canceled)
A flow tube for a bidirectional flow meter comprising:
- a first means (for example in the form of a first flow chamber) for generating a periodic pressure fluctuation whose frequency varies in dependence on the flow rate of fluid through the meter in a first direction;
- a second means (for example in the form of a second flow chamber) for generating a periodic pressure fluctuation whose frequency varies in dependence on the flow rate of fluid through the meter in a second direction, opposite to the first direction, each generating means comprising a diffuser;
- a splitter post;
- and two feedback channels;
- and
- connection means for connecting said first and second generating means in series between an inlet port and an outlet port;
- wherein the diffuser comprises two bodies, and the angle between the two such bodies is between 25° or 28° and 35° or 38°, preferably between 30° and 34°, more preferably approximately 32°.
A flow tube for a flow meter, comprising:
- means for generating a periodic pressure fluctuation whose frequency varies in dependence on the flow rate of fluid through the meter, wherein said means comprises:
- a diffuser;
- a splitter post;
- and
- two feedback channels;
- a throat positioned upstream from the diffuser;
- and
- an elongate body, positioned downstream of the splitter post, arranged to reduce the backflow around the downstream end of the splitter post.
A flow tube for a flow meter, comprising:
- means for generating a periodic pressure fluctuation whose frequency varies in dependence on the flow rate of fluid through the meter, wherein said means comprises:
- a diffuser;
- a splitter post;
- and
- two feedback channels;
- and a throat;
- wherein the minimum cross sectional area of an outlet port is greater than the cross-sectional area of the throat.
Dependencies are inferred from the claim text.