SU502264A1 - Device for dynamically calibrating pressure sensors - Google Patents

Description

one

The invention relates to instrumentation engineering, in particular to devices for functional testing and calibration of pressure sensors.

Devices for dynamically calibrating pressure sensors are known, comprising a cylinder-piston-type working chamber to which a sensor to be calibrated is connected, an actuator for generating amplitude and frequency-controlled pressure fluctuations, and a spool pair, the cup hole of which is connected to the working chamber, and the hole connected to the shaft. spool actuator - with a reference sensor.

In order to improve the calibration accuracy and productivity of the proposed device, the spool hole is permanently connected to the working chamber, for example, by means of an internal annular bore in a steel channel, in which holes are made around the entire circumference, for example, evenly every 15 ° moreover, a reference sensor is supplied to each hole of the glass.

FIG. 1 shows the proposed device, longitudinal and transverse sections; in fig. 2 shows the mutual arrangement of the elements of the device at individual moments of the period of pressure oscillations in the working chamber.

A device for dynamically calibrating pressure sensors (Fig. 1) is mounted on

The base 1, on which is also attached an electric motor 2 with an adjustable speed of rotation of the shaft. The motor shaft is connected to the drive shaft 3 of the transmission mechanism 4,

equipped with a screw-pair 5 for controlling the amplitude of oscillations and installed in the housing 6. A piston 7 is connected to the transmission mechanism, which, moving in the cylinder 8, creates pressure pulsations in

the working chamber 9. The calibrated sensor 10 is connected to a fitting 11 fixed to the cylinder, having boreholes for pressure transfer. The fitting 11 by pipe 12 is connected to the spool pair.

The spool 13 is made in the form of a stepped shaft, the portion of which is smaller in diameter is part of the drive shaft 3 and has drilling holes to transfer pressure to the hole 14 formed on the cylindrical surface

plot of larger diameter. The cup 15 is a hollow stepped cylinder, the inner surface of which is rubbed onto the spool 13, and the end of a smaller diameter is fastened through a gasket

to building 6.

To supply pressure to the bore 14 of the spool 13, the cup 15 has a drill, equipped with a clamp, for connection to the pipeline 12, and an internal annular bore. In the plane of rotation of the axis of the hole 14

The spool 13 along the circumference of the cup 15 with an angular pitch of 15 ° has holes 16, through which the spool communicates with the reference sensors 17.

The device (Fig. 1) works as follows. By rotating the electric motor 2 through the drive shaft 3 and the transmission mechanism 4, the piston 7 is rotated in reciprocating motion in the cylinder 8, as a result of which periodic pressure oscillations are created in the working chamber 9. These vibrations are transmitted to the sensor 10 being calibrated through the holes in fitting 11, and through pipe 12 through an annular bore to hole 14 of spool 13. At the time the hole 14 coincides with one of the holes 16 of the cup 15, the pressure corresponding to a certain position of the piston 7 in the working chamber 9, perceived by the sensor 17 of this hole.

At that moment, when the piston 7, having passed the path A5, will take a new position in the working chamber 9, and the spool 13 will rotate by angle F, the hole 14 will align with the next hole in the direction of rotation 16, the reference sensor 17 of which senses the pressure corresponding to the new position 7 in the working chamber 9. In the same way, the pressure created in the working chamber 9 at different positions of the moving piston 7, during one revolution of the opening 14 of the spool 13 is sensed by the rest of the reference sensors 17 communicated with the valve through the holes 16 cups 15. In connection with the shortness of the moments of alignment of the opening 14 of the spool 13 with the openings 16 of the cup 15, the recording of the readings of the reference sensors 17 and the recording of signals from the calibrated sensor 10 is carried out at the end of the device’s cycle speed during which the alignment takes place.

system pressure working chamber 9 - reference sensors 17.

Thus, given the amplitude and frequency of oscillations, the proposed device during one operation cycle allows one to obtain all the data needed for dynamic calibration of a pressure sensor. At the same time, along with an increase in accuracy, in proportion to the number obtained by indication

reference sensors 17 points of the calibration curve I (Fig. 2), and the calibration performance is improved. Comparing the results of processing the curve II recorded from the signals from the sensor 10 being calibrated with the results of processing the curve I is the final goal of the calibration.

Claims (1)

Invention Formula Dynamic calibration device pressure sensors comprising a cylinder-piston-type working chamber to which the sensor to be calibrated is connected, an actuator for generating amplitude and frequency-controlled pressure oscillations and a spool-type a pair, the valve of which is connected to the drive shaft and has one hole connecting the cavity of the valve with the working chamber, and another hole connecting the cavity of the valve with the reference sensor installed in A hole of the spool pair located in the plane of rotation of the axis of the spool hole, characterized in that, in order to increase accuracy and performance, the spool hole is permanently connected to the working chamber in it, for example, by means of an internal annular bore in the glass, and in the glass several holes along the whole circumference line, for example, uniformly every 15 °, while each hole of the glass is equipped with a reference sensor. / 2 / 7