SU821981A2 - Device for dynamic graduating of pressure sensors - Google Patents

Description

The invention relates to the field of measuring equipment, in particular, to devices for dynamic calibration of pressure sensors.

From the main author. St. In 71758.6, a device is known for dynamically calibrating pressure sensors, comprising an electric drive, a load chamber and a working chamber filled with hydraulic fluid, static pressure sources, rotating pistons with a shaft, thrust bearings, reference pressure gauges, a calibrated pressure sensor, current collector, ring-shaped insert sectors, a pressure sampling hole to the reference gauge, a pressure sampling hole to the sensor, a narrowing gap, and SI recording devices. ·

The disadvantage of this device is that in the process of calibrating the sensors, it becomes necessary to determine the coordinates of the pressure on the obtained oscillograms, equal to the readings of the 25 reference pressure gauge

The aim of the additional invention is to simplify the measurement process and improve the accuracy of calibration. thirty

This goal is achieved by the fact that in the known device for the dynamic calibration of pressure sensors containing an electric drive, a loading and working chamber filled with a working fluid, static pressure sources, rotating pistons with a shaft, thrust bearings, reference pressure gauges, a calibrated pressure sensor, current collector, insert in the form of an annular sector, a pressure take-off hole to the reference pressure gauge, a pressure take-off hole to the sensor, a narrowing gap, recording instruments, in the insert in the pressure take-off Full slot. This simplifies the measurement process and improves measurement accuracy.

In FIG. 1 shows a device for dynamically calibrating pressure sensors, * in FIG. 2 - insert; on 'fig.Z - tapering gap formed by the planes of the liner and the rotating piston; in FIG. 4 - pressure waveforms.

The device comprises an electric drive 1, a rotating load piston 2, a sealed cylindrical body 3; load cavity 4, static pressure inlets 5, 6, thrust bearings 7, reference gauges 8, 9, calibrated pressure sensor 10 ^J. , current collector 11, electronic amplifier 12, pressure indicator 13, working cavity 14, rotating piston 15, liner 16 in the shape of the annular sector, the hole 17 of the selection · * of pressure to the reference pressure gauge 8, (hole 18 of the selection of pressure to the sensor 10, groove 19.

, A device for dynamic calibration of pressure sensors works as follows.

After this device is brought into measurement mode, a stationary field of variable pressure 15 is formed in the narrowing gap (Fig. 3), and it will be constant in the region of the groove 19 (Fig. 3). The purpose of the groove is to equalize the pressure field in the selection zone 17 to the reference pressure gauge 8 (Fig. 1). 20

In the process, the calibrated sensor 10 (Fig. 1), crossing the pressure field, registers it. On the obtained oscillograms (Fig. 4), the horizontal segments ab · 'correspond to constant levels of the stationary field. This simplifies the measurement process, since there is no need to calculate the ordinates of pressure equal to the readings of the reference pressure gauge 8. In addition, this change in the device increases the accuracy of calibration of the sensors. The economic effect is determined by reducing the complexity of the measurement.

Claims (1)

The invention relates to the field of measurement technology, in particular, to devices for dynamic calibration of pressure sensors. From the main auth. St. No. 717586, a device for dynamic calibration of pressure sensors is known; it contains electrification, load and working chambers filled with working fluid, static pressure sources, rotary pistons with shaft, thrust bearings, reference manometers, calibrated pressure sensor, current collector, liner in the shape of an annular sector, the opening of the pressure to either the reference pressure gauge, orifice. pressure selection to the sensor, narrowing the gap and registering devices 11. The disadvantage of the device is that during the calibration of the sensors, it is necessary to determine the coordinates of the pressures equal to the indications of the reference manometer on the oscilloscopes obtained. precision graduation. This goal is achieved by the fact that, in a known device for dynamic calibration of pressure sensors, they include: electric drive, load and working chambers, filled with working fluid, static pressure sources, rotary pistons with shaft, support bearings, reference gauges, calibrated pressure sensor , current collector, liner in the form of an annular sector, a pressure tapping hole to the reference manometer, a pressure tapping hole to the sensor, a narrowing gap, recording devices, in the liner in the pressure tapping zone or a groove. This simplifies the measurement process and improves the measurement accuracy. In FIG. 1 shows a device for dynamically calibrating sensors. pressure / fig. 2 - liner; in FIG. 3 — a narrowing gap formed by the liner planes and the rotating piston J in FIG. 4 — pressure waveforms. The device comprises an electric drive 1, a rotating load piston 2, a hermetic cylindrical body 3; load cavity 4, inlets 5, 6 of static pressure. thrust bearings 7, reference gauges 8, 9, calibrated pressure sensor 10., current collector 11, electronic amplifier 12, pressure indicator 13, working cavity 14, rotating piston 15, bushing 16 in the shape of an annular sector, a hole 17 for selecting pressure to reference pressure gauge 8 , a pressure take-off opening 18 to the sensor 10, a groove 19. A device for dynamic calibration of pressure sensors operates as follows. After this device is taken to the measurement mode, in a narrowing gap (Fig. 3) a stationary field of alternating pressure forms with it, and in the region of the groove 19 (Fig. 3) it will be constant. The purpose of the groove is to equalize the pressure field in the selection zone 17 to the reference pressure gauge 8 (Fig. 1). During the operation of the device, the calibrated sensor 10 (Fig. 1), crossing the pressure field, registers it. On the obtained oscillograms (Fig. 4), the horizontal segments ab correspond to constant levels of the stationary field. This simplifies the measurement process, since there is no need to calculate the ordinates of pressures equal to those of the reference pressure gauge 8. In addition, such a change in the device improves the calibration accuracy of the sensors. The economic effect is determined by reducing the laboriousness of the measurement. The invention The device for dynamic calibration of pressure sensors according to the author. St. No. 717586, characterized in that, in order to simplify the measurement process and improve the calibration accuracy, an I groove is made in the insert in the pressure selection zone. Sources of information taken into account in the examination 1. Copyright certificate CCGP. No. 717586, cl. G 01 L 27/00, 06.01.78,