BENDING MOMENT SENSOR FOR HIGH-TEMPERATURE VORTEX FLOWMETERS Russian patent published in 2022 - IPC G01F1/32 

FIELD: sensors.

SUBSTANCE: invention relates to high-temperature bending moment sensors in vortex flow meters for recording the frequency of vortices behind the bluff body, proportional to the flow rate of a liquid, steam or gas. A distinctive feature of the sensor according to the invention is the fact that the piezoelectric disk directly adjoins the bottom with a fully metallic surface thereof, with a surface with separated electrodes adjoins the surface of the sintered electrodes of the transitional fastener made of high-temperature ceramics with two sintered electrodes on the side of the end facing the piezoelectric disk, and on the other end, with sintered coaxially arranged metal washer and ceramic tube provided with two channels with metal wires connected with the sintered electrodes, and on the other end connected with the signal conductors of the shielded cable, the shield conductor of the shielded cable is electrically connected with the body of the sensor, each of the sintered electrodes is connected with one of the electrodes of the piezoelectric disk, a pressure sleeve is placed between the transitional fastener and the lower sealing sleeve in the body on a threaded connection, and matching grooves are made on the inner surface of the cylindrical body and the outer surface of the transitional fastener, parallel to the axis of the sensor, wherein a fastening connector is installed. The piezoelectric disk can also constitute a piezoelectric film.

EFFECT: increase in the level of sensitivity of the sensor in a wide temperature range due to a structural change of the sensor, providing secure mechanical contact between the structural elements for transformation of periodic bending deformations from the wedge-shaped wing through the membrane to the piezoelectric element, as well as secure electrical contact of the electrodes of the piezoelectric element with the output electrical conductors.

2 cl, 6 dwg, 1 tbl