关键词: 工业物联网, 叶片式管道流量计, 能量采集, 锥形转子, 发电效率

Abstract: Aiming at the difficulty of power supply in real-time monitoring of pipeline flow based on industrial internet of things, a conical rotor vane pipeline flowmeter with energy collection and wireless communication capability was proposed. Firstly, the key component of the proposed flowmeter was a four-blade rotor, and the potential energy of water flow was converted into electric energy by the rotation of the rotor with permanent magnets embedded in the periphery, and the working principle analysis and power generation efficiency calculation method were given. Then, in order to further improve the power generation performance, a cone(conical rotor) was installed at the front end of the rotor to generate high-speed water flow and guide it to the nearby blades, and the influence of the cone was analyzed by fluid simulation. Secondly, the corresponding control unit of internet of things was designed, which used the electric energy generated by the rotor rotation to detect the rotor speed and communicate wirelessly with the internet server. Finally, the power generation performance and measurement accuracy were evaluated through experi-ments. The results show that the pressure difference before and after the rotor blade with cone is obviously greater than that without cone. With the increase of cone diameter, the power and pressure difference generated by the rotor will increase, and the highest power generation efficiency is 0.074. The flow rate can be obtained by measuring the rotational speed, and the full-scale accuracy is 1.2 %. When the flow rate is greater than 0.6×10^-3 m³/s, the output power of the flowmeter is greater than 10 mW, which is enough to realize long-term wireless flow monitoring.

Key words: internet of things, vane pipeline flowmeter, energy collection, conical rotor, generating efficiency