Sinusoid pressure generator with inlet-outlet bidirectional modulation

Abstract

The invention belongs to the field of dynamic pressure calibration, in particular to a sinusoid pressure generator with inlet-outlet bidirectional modulation. A rotating wheel is positioned between a shell and a shell cover; an annular cavity is formed between the rotating wheel and the shell cover; circular radial vents communicated with the annular cavity are evenly distributed on the rotating wheel in a circumferential direction; the top of the shell is provided with a sinusoid pressure cavity; the cambered surface of the pressure cavity clings to the outer cambered surface of the rotating wheel; radial square holes communicated with the vents are evenly distributed on an outlet of the pressure cavity; an inlet of the pressure cavity is provided with an air nozzle; a flow regulator is arranged between the air nozzle and the inlets of the square holes; a cylindrical pressure generating cavity is arranged at the center of the square holes; and pressure sensor mounting through holes communicated with the pressure generating cavity are symmetrically arranged on both sides of the square holes. The generator extends calibration frequency range of a sinusoid dynamic pressure calibration device, greatly improves sinusoidal pressure waveforms generated by the sinusoid dynamic pressure generator and improves static-dynamic amplitude ratio of the sinusoid dynamic pressure waveforms.

Description

technical field [0001] The invention belongs to the field of dynamic pressure calibration, and in particular relates to a sinusoidal pressure generator with two-way modulation of inlet and outlet. Background technique [0002] With the development of science and technology, in aerospace, weapons, nuclear industry, automobile and other industries, it is necessary to measure a large amount of dynamic pressure in the technical fields of hydraulic control, engine and explosion. To measure the dynamic pressure accurately, it is necessary The dynamic behavior of the pressure sensors used in the measurement process must be calibrated. The import and export bidirectional modulation sinusoidal pressure generator is the core component of the sinusoidal dynamic pressure calibration device used for the calibration of the dynamic characteristics of the pressure sensor. [0003] At present, fixed volume variable mass sinusoidal pressure generators are all used figure 1 and figure 2 On...

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Problems solved by technology

[0005] (1) The radius r of the disc cannot be infinitely large, so the waveform distortion is relatively large;

[0006] (2) Due to the large radius r of the disk, the force on the disk is an axial force, which is perpendicular to the plane of the disk, and the working pressure of the generator is limited;

[0007] (3) Due to technical problems, it is difficult to control the gap between the disc and the pressure chamber, because when the diameter of the disc is large, it is necessary not only to ensure that the surface of the disc is very smooth, but also to ensure that the disc is very smooth during operation. Steady, there are difficulties in the process, which limits the lower limit of the working frequency of the generator

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