Intelligent channel flow monitor based on piezoelectric beam

Abstract

The invention relates to an intelligent channel flow monitor based on a piezoelectric beam and belongs to the fluid monitoring field. An inner wall of a channel is equipped with a flow-disturbing body and an inner cylinder, wherein two ends of the inner cylinder are equipped with end covers, the left end cover is equipped with a sensor and a circuit board, a pin is sleeved in a center hole of the left end cover, two ends of the pin are sleeved with springs, the left end of the pin is equipped with an exciter, the right end of the pin is welded with a left side board, an outer rim of the left side board is sequentially equipped with separator boards and a right side board, metal substrates are respectively crimped between the left and right side boards and the separator board and between two adjacent separator boards, cantilever beams on the substrates and piezoelectric wafers are bonded to form piezoelectric oscillators, end portions of the piezoelectric oscillators are equipped with mass blocks, and one sides of the left and right side boards and two sides of the separator boards are provided with limit faces and sinking grooves. The monitor is advantaged in that power generation and flow velocity self measurement are simultaneously realized by utilizing the coupling effect, and real flow velocity online monitoring can be realized; the monitor is configured along the length direction of a pipeline, the structure of the monitor is simple, the radial scale is small, and the required energy and bandwidth can be easily acquired through the multiple piezoelectric oscillators; the piezoelectric oscillators are reasonable in structure, and properties of large power generation capacity and high reliability are realized.

Description

technical field [0001] The invention belongs to the technical field of fluid state monitoring, and in particular relates to an intelligent pipeline flow monitor based on piezoelectric beams. Background technique [0002] Due to natural corrosion, natural force majeure, and man-made theft, leakage events of long-distance pipelines for oil and natural gas and other fluids during use occur from time to time. Frequent pipeline leakage not only causes huge economic losses, but also affects the surrounding nature. The environment has caused serious pollution. In the past, regular manual inspections were often used for maintenance. However, due to the long laying distance of oil and gas pipelines and the fact that they are often located in inaccessible or inconvenient places, regular inspections are difficult to find leaks and maintain them in time. Therefore, various types have been proposed for pipeline leakage monitoring or anti-theft systems. Although some of the pipeline lea...

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Problems solved by technology

Although some of the pipeline leakage or anti-theft monitoring and alarm methods proposed are relatively mature at the technical level, the application of the anti-theft monitoring system for long-distance pipelines in China is still in the preliminary stage and has not been widely used. One of the main reasons is that The power supply problem of the monitoring system has not been well resolved: 1) The method of laying cables is expensive and is easily cut off by criminals, which affects the normal operation of the monitoring system; 2) When using batteries for power supply, the use time is limited and needs to be replaced frequently. Once the battery is insufficient and not replaced in time, the remote transmission of monitoring information cannot be completed; 3) In recent years, in order to meet the self-power supply requirements of related wireless sensor monitoring systems, people have also proposed various forms of turbine-type miniature power generation devices. The biggest problem is that the structure is complex and the volume is relatively large, which is not suitable for occasions with small diameter pipes. Some structures of power generation devices also have electromagnetic interference and other phenomena, and their popularization and application have been restricted to a certain extent.

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