Leakage determination system and leakage determination method

• US 10,036,684 B2
• Filed: 11/10/2014
• Issued: 07/31/2018
• Est. Priority Date: 11/12/2013
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Kinoshita, Shohei, Sasaki, Yasuhiro, Mikami, Nobuhiro, Takahashi, Masatake, Tominaga, Shin, Shinoda, Shigeki, Takata, Soichiro
• Primary Examiner(s): Ha, Nguyen
• Application Number:
  US15/034,027
• Publication Number:
  US 20160282219A1
• Time in Patent Office: 1,359 Days
• CPC Class Codes: G01M 3/00 Investigating fluid-tightness of structures
• CPC Class Codes: G01M 3/002 by using thermal means
• CPC Class Codes: G01M 3/24 using infrasonic, sonic, or ultrasonic vibrations
• CPC Class Codes: G01M 3/243 for pipes
• CPC Class Codes: G01M 3/26 by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
• CPC Class Codes: G01M 3/2815 using pressure measurements

Abstract

In a related fluid leakage detecting device, erroneous leakage determination may occur due to a change in a state of a fluid in piping.

A leakage determination system of the present invention includes a first detection means for detecting a prescribed physical quantity indicating a state of a fluid in piping, a second detection means for detecting vibration propagating through the piping, and a leakage determination means for performing leakage determination based on the physical quantity detected by the first detection means and the vibration detected by the second detection means.

Claims

1. A leakage determination system comprising:

a fluid state detector;

a memory configured to store a physical quantity and a feature value of vibration in association with each other;

a vibration detector; and

a processor configured to;

detect a leakage of piping based on vibration detected by the vibration detector that detects vibration propagating through the piping and a physical quantity indicating a state of fluid in the piping detected by the fluid state detector;

determine a threshold value corresponding to the physical quantity detected by the fluid state detector,

detect the leakage of the piping when a feature value of the vibration detected by the vibration detector exceeds the threshold value; and

determine the threshold value stored by the memory.

2. A leakage determination system comprising:

a fluid state detector;

a vibration detector; and

a processor configured to

detect a leakage of piping based on vibration detected by the vibration detector that detects vibration propagating through the piping and a physical quantity indicating a state of fluid in the piping detected by the fluid state detector;

determine a frequency range corresponding to the physical quantity detected by the fluid state detector, and

detect the leakage of the piping based on the vibration with respect to the frequency range detected by the vibration detector.

3. The leakage determination system according to claim 2, wherein the processor configured to

extract signals in the frequency range from signals generated by the vibration detector, and

detect the leakage of the piping based on the extracted signals.