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Air corrosion monitoring system of area distributing drainage building

A technology for drainage structures and monitoring systems, applied in the field of regional distributed drainage structure cavitation monitoring systems, can solve the problems of high vibration and noise, "low signal-to-noise ratio, and high flow rate, and achieve convenient construction and operation management. , the effect of high diagnostic accuracy and wide monitoring range

Inactive Publication Date: 2006-09-20
TIANJIN UNIV
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Problems solved by technology

There are the following problems and defects in using the cavitation monitoring instrument of hydraulic machinery for cavitation monitoring of flood discharge structures: (1) The area where cavitation damage may occur in discharge structures is wide, and the monitoring range of "point" sensors is not large enough, which is easy to (2) The flow rate of the drainage structure is high, and the vibration and noise before cavitation are relatively large. The "signal-to-noise ratio" of cavitation monitoring is relatively small, and the "point" type Sensors are prone to "misdiagnosis"; (3) These "point" sensors are subjected to high-speed water flow for a long time, and the instrument is prone to failure

Method used

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  • Air corrosion monitoring system of area distributing drainage building
  • Air corrosion monitoring system of area distributing drainage building

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Embodiment Construction

[0009] The regional distributed cavitation monitoring system for drainage structures of the present invention determines key areas for monitoring and protection of cavitation cavitation according to the level of drainage structures and the flow state of internal water flow. This area includes the surface extent and longitudinal depth along the release structure. When the discharge structure is constructed to a specified level, it is generally 15-30cm away from its water-passing surface, and the optical fiber sensor is placed on the plane (or curved surface) along the water flow direction to form a wave curve, or a cloud-shaped curve, and a continuous "8" Zigzag curves and other network structure curves are laid on this layer, and the two ends of the optical fibers are respectively connected to their respective optical cable splicing boxes. Then continue the construction to another monitoring level, generally 3-6cm away from the surface of the drainage structure. According to t...

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Abstract

This invention discloses a area distributed drain building cavity erosion detecting system. The system is made up by sensor, transmission cable, analysis system, early warning and alarm system. One fiber optic sensor is reticular laid on two cross section of building surface, two fiber optic sensors are connected to fiber vibration survey meter through optical cable, the meter transfers the vibration signal to signal processing and analysis module, and the module decomposes the signal into high frequency component and low frequency component, and output corresponding self power spectrum and cross correlation spectrum, the high frequency signal is sent to cavitation early warning system, the low frequency signal is sent to cavity erosion grade alarm system. The detecting range is wide, diagnose accuracy rate is high, durability is good, regional synchronous cavitation cavity erosion detecting can be realized. The forward end of fiber optic network is passive, all supplying equipments and detecting equipments are in control room in distant, execution and running is convenient.

Description

【Technical field】 [0001] The invention relates to the technical field of automatic monitoring of drainage building structures in water conservancy and hydropower projects, in particular to a cavitation monitoring system for regionally distributed drainage structures. 【Background technique】 [0002] At present, there are many examples of damage to drainage structures in water conservancy and hydropower projects. Cavitation damage occupies a considerable proportion in it. However, people's monitoring of cavitation and cavitation is mainly concentrated on hydraulic machinery such as hydraulic turbines and water pumps, and corresponding technologies and products have been formed, such as measuring the pressure of flow-passing parts, water pressure pulsation, vibration, noise, or monitoring the abrasion of blades damage, reduced turbine efficiency, etc. So far, people have not paid enough attention to the cavitation and cavitation monitoring of drainage structures, and there is...

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Application Information

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IPC IPC(8): G01N17/00G01N21/84
Inventor 练继建葛春风刘昉
Owner TIANJIN UNIV
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