Combustion – With indicator or inspection means
Patent
1996-04-02
1998-09-15
Jones, Larry
Combustion
With indicator or inspection means
126 44, 126 52, 126 39R, 126275R, 126273R, 73149, F23D 512
Patent
active
058070923
DESCRIPTION:
BRIEF SUMMARY
SPECIFICATION
The present invention relates to a method of detecting the residual quantity in a cassette-type gas cylinder and to a device therefor which are so devised that when a cassette-type gas cylinder containing liquefied gas fuel is set in a gas appliance such as a portable gas stove, etc. the amount of liquefied gas, which falls accompanying use, is detected at a specific residual gas quantity.
BACKGROUND TECHNOLOGY
Devices in which, instead of gas being supplied from a city gas outlet by a gas hose, a cassette-type gas cylinder in which liquefied gas fuel is contained in a container is set in a table-top gas range, etc. and combustion is effected through supply of gas from this gas cylinder are known conventionally. Such a cassette-type gas cylinder is also used in various other types of gas apparatus such as portable ranges or stoves for use outdoors.
In a gas appliance using a cassette-type gas cylinder, if the arrangement is made such that the amount of gas remaining in the gas cylinder can be detected by means of the apparatus, it is easy to respond when the gas is used up. If the amount of gas remaining is not known, there are problems in connection with safety and with waste disposal, since the gas cylinder may be replaced or thrown away while there is still gas remaining in it.
By way of a method for detecting the amount of gas remaining in such a gas cylinder, there is known a method in which changes in the weight of a gas cylinder are detected (see Japanese Laid-open Patent Application Nos. 4-270811 and 5-203143, etc.), a method in which the gas pressure is detected (see Japanese Laid-open Utility Model Application No. 62-97399) and a method in which the combustion time is detected (see Japanese Laid-open Utility Model Application No. 5-8243). However, with these arrangements, accurate, stable detection of very small residual quantities is difficult, and complex and expensive mechanisms and control systems are needed in order to improve the detection precision.
Further, by way of methods for detecting the liquid level in a bottle, tank or high-pressure cylinder, etc. containing a liquid, a variety of techniques which use the resonance of such a container or the cavity resonance of the container's interior have been proposed (see Japanese Laid-open Utility Model Application No. 3-76129 and Japanese Laid-open Patent Application Nos. 5-223612 and 50-132960).
Specifically, there is disclosed a method in which a container's resonant frequency when the liquid surface comes to a specific position inside the container is determined, sound waves of this frequency are produced, and the liquid level is detected at the point when the container resonates. This method is one which uses the cavity resonance of a container and in which the liquid level is detected through the container's resonant sound, taking advantage of the characteristic that, when the liquid level falls and the cavity inside the container becomes larger, this is accompanied by a shift in the resonant frequency to a lower frequency.
However, this method of using a container's cavity resonance sound to detect the liquid level cannot be used directly for the detection of the residual liquid gas quantity in a cassette-type gas cylinder.
That is, in the abovedescribed prior art technique, the shape and structure of the container are simple and the container is one in which, whether there are joint portions or not, there are homogeneous joints, and its resonance and the resonance of the cavity portion in it in which contents are held are simple and display a clear resonance mode, and the technique is one which is based on the characteristic that the resonant frequency changes in accordance with the amount of material contained and which detects a residual quantity simply from the container's resonant sound. Also, setting to any detection liquid level can be made by altering the resonant frequency that is transmitted.
In contrast, as shown in FIG. 2, in the can structure of a cassette-type gas cylinder, the can body 2 of a gas cylinde
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patent: 5385069 (1995-01-01), Johnson, Jr.
patent: 5612622 (1997-03-01), Goldman et al.
Mifune Hideo
Nakamura Yasuaki
Jones Larry
Tokai Corporation
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