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

FIELD: measuring technology.

SUBSTANCE: invention relates to vortex flowmeters of liquid, gas or steam, in particular to bending moment sensors, for recording the frequency of vortices formed in the flow of liquid, gas or steam behind the flow body. A distinctive feature of this sensor for vortex flowmeters is that, according to the invention, the bottom is a membrane whose diameter is equal to the inner diameter of the bottom, a wedge-shaped wing connected to the outer surface of the bottom at its thickened base at the junction with the bottom has a cylindrical neck, the diameter of which does not exceed 1/3 of the inner diameter of the bottom, on the inner side of the bottom in its center, it is connected to a piezoelectric assembly lock having a transverse size not exceeding 1/3 of the inner diameter of the bottom, and a height not exceeding 1/5 of the piezoelectric assembly’s long side, the piezoelectric assembly is an annular piezoelectric element with the upper electrode divided into two symmetrical half-rings located on the membrane, the retainer of the piezoelectric assembly is located in the central hole of the annular element, the axis of symmetry of the half-rings of the upper electrode is parallel to the plane of symmetry of the wedge-shaped wing, and the other two piezoelectric elements, which are rectangular piezo plates, are fixed on both sides of the piezoelectric assembly retainer, moreover, the planes of the piezo plates are parallel to the plane of symmetry of the wedge-shaped wing.

EFFECT: increase in the level of sensitivity and the intrinsic resonant frequency of mechanical oscillations of the sensor housing due to a change in the design of the housing with respect to reducing the length of its oscillating part and the fixation unit of piezoelectric plates for a more efficient transformation of bending deformations of the membrane into bending deformations of piezoelectric plates; also, there is the possibility of compensating the pyroelectric effect by introducing an additional piezoelectric element from the same piezoelectric as the other piezoelectric elements.

1 cl, 2 dwg, 1 tbl