SU932325A2 - Hydroacoustic pulser for checking pressure pickups - Google Patents

Description

The invention relates to instrumentation, in particular, to devices for aligning pressure. According to the main author. St. M 67О835 is known for a gyro acoustic pulsator, containing a base, a puller with a waveguide, a wave center | An ionizer and medium separator Sh. A disadvantage of this pulsator is the high chemical solubility and mechanical penetration of gas bubbles into the working fluid at an overpressure due to the large area of contact between gas and liquid in the fluid separation body. As a result, an increase in the inhomogeneity of the working fluid, a decrease in the amplitude of oscillations of the variable component. In addition, the lack of a pulsator with a float-type media separator is that in order to reduce the contact area between liquid and gaseous media, it is necessary to have a minimum gap between the float and the chamber walls, which in turn leads to jamming of the float in the separation chamber pulsator. The purpose of the invention is to expand the range of calibration. The goal is achieved by the fact that in the device the medium separator is made in the form of a capillary tube bent in the form of a cylindrical spring, the volume of the capillary exceeding the specified maximum change in the volume of the waveguide resonator. The drawing shows the proposed pulsator, General view. The pulsator consists of a base 1, a vibration exciter 2, a membrane 3, a resonator waveguide 4, a medium separator 5 made of caps of a pnoi tube with a continuous lowering in the vertical and bent, for example, in the form of a cylindrical spring. The upper end of the capillary tube is connected via a tee 6 with a source 7 of pressure and to a submembrane cavity 8, and the lower end through

pipe 9 using 10 waveguide resonator. A head, in which test pressure transducers 2 are installed, is connected to the upper part of the resonator waveguide-i. In order to ensure tightness, the waveguide resonator and the base are made of studs 13.

The pulsator works as follows.

The cavity of the waveguide resonator, the pipe 9 and the medium separator 5 are filled with a working fluid (point A is the liquid level in the medium separator). When a pressure source 7 is connected (a compressed gas cylinder), the gas fills the submembrane cavity, as well. Through the divider sret 5 and the pipeline 9 creates a predetermined static pressure in the wave 8. wavelength 0 cavity.

With a maximum static aavleni, the level of the working fluid in the capillary separator of the media decreases to a certain point B. Thus, gas bubbles in the cavity of the waveguide-resonator are excluded. A remote exciter, 2 CEC1, is connected to the source of alternating oscillations (not

shown), in the cavity 1O of the waveguide-resonator, a pulsating alternating pressure is created, which acts on the calibrated measurement transforms. 2 pressure gels.

The use of the present invention will make it possible to simplify the design of the pulsator and increase the amplitude of oscillations of the variable component of the pressure on.

Claims (1)

Invention Formula Hydroacoustic pulsator for calibration of pressure sensors according to author. N9. 670835, different. In order to expand the range of calibration, the medium separator is made in the form of a capillary tube, bent in the form of a cylindrical spring, and the volume of the capillary exceeds the specified maximum change in the volume of the waveguide-resonator. Sources of information taken into account in the examination. Author's certificate of the USSR H 670835, cl. G About L 27 / OO, 979.