| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact device for detecting an abnormal flow capable of directly detecting the abnormal flow, without detecting the abnormal flow, by indirectly determining a flow rate from a pressure, thereby enhancing the accuracy of detection and preventing malfunction of detection by enlarging the ratio of a moving amount of a float to a flow rate change without enlarging the whole device. SOLUTION: The device includes: an area type flow rate means wherein a large diameter pipe having a larger sectional area than a small diameter pipe and communicated with the small diameter pipe is extended on an upper part of the small diameter pipe having a straight-pipe shaped channel for a fluid, and the float having a larger specific gravity than the fluid is floated vertically movably inside the small diameter pipe while the float is held by a guide part provided inside the small diameter pipe, and the flow rate is measured by a moving position of the float; the float on which a magnetized permanent magnet is mounted; and a detection means having a magnetic switch disposed outside the large diameter pipe or the small diameter pipe. An abnormality of the pipe inside flow rate is detected by the float position. COPYRIGHT: (C)2010,JPO&INPIT
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