GAS SHUTOFF DEVICE - PANASONIC CORP

Title:

GAS SHUTOFF DEVICE

Document Type and Number:

WIPO Patent Application WO/2010/070902

Kind Code:

A1

Abstract:

With a conventional gas shutoff device, a non-uniform gas layer can be produced by a shift in the amount of heat or by mixing of a gas of a different type from the gas currently in use during installation or replacement, and an unexpected flow volume may be detected due to a disruption in the propagation of ultrasonic waves, resulting in an erroneous judgment of a flow volume abnormality or a sensor abnormality. With the invented gas shutoff device, a closing timing unit (14) begins timing based on a valve-close signal which is output with a flow volume abnormality or a sensor abnormality, and outputs a valve-open signal to a valve drive unit (12) if a cancellation input is received from outside within a set time. Thus, even when a non-uniform gas layer is produced by a shift in the amount of heat or by mixing of a gas of a different type from the gas currently in use during installation or replacement, an unexpected flow volume is detected due to a disruption in the propagation of ultrasonic waves, resulting in an erroneous judgment of a flow volume abnormality or a sensor abnormality, and the valve is closed, the erroneous judgment is resolved and reuse of the gas is enabled if within a prescribed time.

Inventors:

HONDA TSUYOSHI
OOTANI TAKUHISA
MURASE KOUJI

Application Number:

PCT/JP2009/006937

Publication Date:

June 24, 2010

Filing Date:

December 16, 2009

Export Citation:

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Assignee:

PANASONIC CORP (JP)
HONDA TSUYOSHI
OOTANI TAKUHISA
MURASE KOUJI

International Classes:

G01F3/22

Foreign References:

JP2007147430A	2007-06-14
JPH10103546A	1998-04-21
JP2001193928A	2001-07-17
JP3624642B2	2005-03-02
JP2008323689A	2008-12-19

Other References: