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US 7,730,777 B2Granted
Flowmeter and flow control device
AssigneeYamatake Corporation
InventorsMasanori Anzai, Shoji Kamiunten
Life of this patent
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Abstract
A simply structured flowmeter in which an influence of a dilatational wave on a thermal flow rate sensor is suppressed, and measurement accuracy is enhanced. The flowmeter has not only the thermal flow rate sensor that is placed to face a flow channel and detects a flow rate of fluid flowing through the flow channel but also a micro path (for example, narrow pipe) that is provided to the flow channel and blocks a dilatational wave created in the flow channel from being transmitted to the thermal flow rate sensor.
Claims14
A flowmeter comprising:
- a thermal flow rate sensor that is placed to face a flow channel and detects a flow rate of fluid flowing through the flow channel, and
- a micro path that is formed in the flow channel and blocks a dilatational wave created in the flow channel from being transmitted to the thermal flow rate sensor,
- wherein the micro path is located upstream or downstream of the thermal flow rate sensor in the flow channel to reduce a flow-channel sectional area of the flow channel, and the micro path has a flow-channel sectional size that is approximately twice as large as a thickness of a boundary layer produced by the dilatational wave created in the micro path.
A flowmeter comprising:
- a bypass channel that bypasses from a main channel;
- a thermal flow rate sensor that is interposed in the bypass channel;
- and
- a micro path that is formed in the bypass channel and blocks a dilatational wave created in the bypass channel from being transmitted to the thermal flow rate sensor,
- wherein the micro path is located upstream or downstream of the thermal flow rate sensor in the bypass channel to reduce a flow-channel sectional area of the bypass channel, and the micro path has a flow-channel sectional size that is approximately twice as large as a thickness of a boundary layer produced by the dilatational wave created in the micro path.
2 more elements
Dependencies are inferred from the claim text.