Device for detecting leakage of liquid in tank
First Claim
1. A device for detecting leakage of liquid in a tank, which is inserted into the tank to detect the leakage of liquid in the tank, comprising:
- a measurement tube passage into which the liquid in the tank is-introduced, the measurement tube passage including a measurement tube and a measurement thin tube communicating with the measurement tube and positioned below the measurement tube and having a cross-sectional area smaller than that of the measurement tube;
a sensor for use in measuring a flow rate of the liquid in the measurement thin tube, the sensor being attached to the measurement thin tube; and
leakage detection means for detecting the leakage of the liquid in the tank based on the flow rate measured using the sensor.
2 Assignments
0 Petitions
Accused Products
Abstract
A device placed in a tank and used for detecting a leakage of liquid in the tank. Vertical measurement tube passages (10, 14) into which the liquid in the tank is introduced have a measurement tube (10) and a measurement thin tube (14). The measurement thin tube (14) communicates with the measurement tube and is located lower than the measurement tube. The measurement thin tube has a cross-sectional area that is equal to or smaller than {fraction (1/50)} of that of the measurement tube. A thermal flow sensor (16) used for measuring a liquid flow rate is attached to the measurement thin tube (14). There is provided leakage detecting means (22) for detecting a leakage of liquid in the tank according to the flow rate value measured by the sensor. The leakage detecting means generates a leakage detection signal when a flow rate value measured by the sensor is within a range greater than 0 and smaller than the flow rate value obtained when liquid is added to the tank or when the liquid in the tank is taken out. Thus, even a leakage of a very small amount is detected easily and accurately without stopping the use of the tank.
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Citations
53 Claims
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1. A device for detecting leakage of liquid in a tank, which is inserted into the tank to detect the leakage of liquid in the tank, comprising:
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a measurement tube passage into which the liquid in the tank is-introduced, the measurement tube passage including a measurement tube and a measurement thin tube communicating with the measurement tube and positioned below the measurement tube and having a cross-sectional area smaller than that of the measurement tube;
a sensor for use in measuring a flow rate of the liquid in the measurement thin tube, the sensor being attached to the measurement thin tube; and
leakage detection means for detecting the leakage of the liquid in the tank based on the flow rate measured using the sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device for detecting leakage of liquid in a tank, which is inserted into the tank to detect the leakage of liquid in the tank, comprising:
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a measurement tube passage into which the liquid in the tank is introduced, the measurement tube passage including a measurement tube and a measurement thin tube communicating with the measurement tube and positioned below the measurement tube and having a cross-sectional area smaller than that of the measurement tube;
a sensor for use in measuring a flow rate of the liquid in the measurement thin tube, the sensor being attached to the measurement thin tube;
liquid level detection means for use in detecting a height of a surface of the liquid; and
leakage detection means for detecting the leakage of the liquid in the tank based on a corrected flow rate obtained by correcting the flow rate measured using the sensor based on a liquid level detected using the liquid level detection means and a value of a parameter concerning the shape of the tank. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A device for detecting leakage of liquid in a tank, which is inserted into the tank to detect the leakage of liquid in the tank, comprising:
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a measurement tube passage into which the liquid in the tank is introduced, the measurement tube passage including a measurement tube and a measurement thin tube communicating with the measurement tube and positioned below the measurement tube and having a cross-sectional area smaller than that of the measurement tube;
a sensor for use in measuring a flow rate of the liquid in the measurement thin tube, the sensor being attached to the measurement thin tube;
an open/close valve provided in an upper part of the measurement tube; and
leakage detection means for detecting the leakage of the liquid in the tank based on an integrated value of the flow rate measured using the sensor after closing the open/close valve for a predetermined time and subsequently opening the valve. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A device for detecting leakage of liquid in a tank, which is inserted into the tank to detect the leakage of liquid in the tank, comprising:
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a measurement tube passage into which the liquid in the tank is introduced, the measurement tube passage including a measurement tube and a measurement thin tube communicating with the measurement tube and positioned below the measurement tube and having a cross-sectional area smaller than that of the measurement tube;
a first sensor for use in measuring a flow rate of the liquid in the measurement thin tube, the first sensor being attached to the measurement thin tube;
a second sensor for use in detecting a direction of a flow of the liquid in the measurement thin tube, the second sensor being attached to the measurement thin tube; and
leakage detection means for detecting the leakage of the liquid in the tank based on a combination of the direction of the flow of the fluid detected using the second sensor and the flow rate measured using the first sensor. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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Specification