SU911226A1 - Viscometer for liquid media - Google Patents

Description

The goal is reached by a fluid viscometer containing a vessel for the measured liquid, a sensitive element with a thrust, immersed in the measured liquid and connected at an angle of 90 with the lever arm, the second shoulder of which is connected to the vibro-meter, the pressure chamber air and drive, the sensing element is made in the form of a ball, the vessel for the measured liquid additionally contains a perforated partition inside and a rod attached to its wall connected to the piston, one surface of which is torn and with the spring, the second, opposite to it, is the wall of the chamber for supplying compressed air, and the drive is made in the form of a generator of control sawtooth signals connected by a channel to the chamber for supplying compressed air. FIG. 1 shows a viscometer for liquid media; Fig. 2 is a diagram of the change in the control and output signal over time. The viscometer contains a vessel. 1 for a measurable fluid with a perforated cylindrical partition 2, a sensing element in the shape of a ball 3 immersed in the analyzed medium, rigidly connected by means of a pull 4 at an angle of 90 ° with a double arm lever 5 The lever 5 with a counterweight b is connected to a vibro-meter 7 (for example with a serial electric power converter type UB-E). The vessel 1 for the measured liquid is rigidly connected to the piston 9 by means of a movable rod 8 (for example, a serial pneumatic piston actuator of the PSP-1 type). The piston is connected through the spring 10 to the inner wall surface of the chamber 11 for the supply of compressed air. compressed air supply is connected to a compressed air supply channel with a generator 12 control sawtooth signals (GUPS) .The device works as follows. The analyzed fluid enters the annular space between the vessel wall 1 the measured liquid and the perforated cylindrical partition 2 and further fills the entire vessel. Such vessel design provides constant hydrodynamic conditions inside the measuring vessel regardless of the flow rate of the analyzed fluid. Before turning on the GUCS 12 pressure chamber 11 for supplying compressed air to the actuator the piston 9 is equal to zero, and hence the vessel 1 for the measured liquid, under the action of the spring 10, occupies the lower position. At this moment, two forces act on the ball 3: the force of body and the pushing force on the part of the analyzed liquid, and a certain density. Since the force of the ball's weight is balanced by the counterweight 6, the electric power converter 7 (vibration meter) will produce the output signal Pgbix proportional-io; Full ejection force out 1Fig. b). For starting up the device, the AUCS 12 is included, which produces a control signal that is incremental. in amplitude at a constant speed (Fig. 2a). The piston 9 moves upward under the action of the control signal at a constant speed, carrying the vessel 1 for the liquid to be measured. Thus, the ball 3 at a constant speed will drop down in the vessel 1 for the measured liquid downward. This will cause the ball 3 to vertically upwards the resistance force F, the value of which can be determined using the Stokes formula for the actual movement conditions (4). -b2) (1) where D is the dynamic viscosity of the liquid to be measured, r is the radius of the ball, y is the speed of the ball in relation to the measured liquid, R is the radius of the vessel in which the ball moves. With a uniform movement of the ball in the liquid DOWN, the output signal of vibrator 7 increases by an amount proportional to the resistance force F (Fig. 26). When the maximum of the control signal is reached, the piston stops, the force F 0, the output signal of the power converter returns to the previous value proportional to ejector force DITT; the control signal pressure begins to decrease evenly. The pore 9 under the influence of the spring moves downwards, the direction of movement of the vessel 1 for the measured liquid also changes to the opposite (downward). The effect of this viscous force F acts vertically downward, respectively, reducing the amplitude of the output signal of the electric power converter. When the minimum value of the control signal is reached, the device is in a hollow state and, thanks to the work of the SGC, the loop repeats. . Thus, at the output of the power converter, square-wave signals are generated,

the amplitude of which is proportional to the value of 2 F. At the same time, it is easy to calibrate the secondary recording device to the secondary recording device, since, at a constant speed of the ball 3, the formula (1) will take the VIEW. .

, (2)

where k is a constant calculation factor

The output value of the converter is equal to

,, (3)

where K- is the tuning (constant) value of the converter

for over; given range

measurements. Substituted (2) in (3). will get

P1x - 2K2M% L (4) - gear ratio.

where K.

characterizing the design features and on the tuning value of the converter (vibration meter).

Thus, the output signal of the transducer is obtained, the amplitude of which depends only on viscosity, and the influence of the density of the analyzed liquid is excluded.

The technical and economic effect of using the proposed device is expressed in increasing the accuracy of viscosity measurement of the analyzed liquid.

In addition, the implementation of the invention will simplify the metrological assurance of viscosity measurements.

 the invention

A viscometer for liquid media, containing a vessel for the measured liquid, a sensitive element with a thrust, immersed in the measured liquid and connected at an angle of 9 ° to the lever arm, the second arm of which is connected to the vibrometer, a chamber for supplying compressed air and a drive that differs by that

5 that, in order to improve the measurement accuracy, the sensing element is made in the form of a ball, the vessel for the measured liquid further comprises a perforated cylindrical partition inside and a rod attached to its wall connected to the piston, one surface of which is connected to a spring, the second opposite to it is the wall of the chamber for supplying compressed air,

5a, the drive is made in the form of a generator controlled to a cix of sawtooth signals connected by a channel with a chamber for supplying compressed air.

Information sources,

0 taken into account in the examination

1. Authors certificate of the USSR. No. 709983, cl. G 01 N 11/10, 1980.

2.ABTOfJCKoe certificate of the USSR No. 640177, cl. G 01 N 11/16, 1977

5 (prototype).

Claims (1)

The claims · 'The value of the output signal of the Converter is equal to ^ EX (3) where K_ - tuning (constant) - converter value - for a given measurement range. Substituting (2) in (3). we get '< ⁴⁾ where Κθ is the gear ratio characterizing the design features and the tuning value of the transducer (vibration meter). Thus, the output signal of the converter is obtained, the amplitude of which depends only on the viscosity, and the influence of the density of the analyzed liquid is excluded. The technical and economic effect of using the proposed device is expressed in increasing the accuracy of measuring the viscosity of the analyzed fluid. A liquid viscometer containing a vessel for the measured bone, a goy sensor, immersed in the measured bone and connected at an angle to the lever arm, the second arm of which is 90 ° heavy and connected to a vibration meter, a chamber for supplying compressed air and a drive, characterized in that, in order to improve the accuracy of the measurement, the sensing element is made in the form of a ball, the vessel for the measured liquid further comprises a perforated cylindrical partition inside and a rod attached to its wall connected to the piston, one surface of which is connected with the spring, the second opposite to it is the wall of the chamber for supplying compressed air, and the drive is made in the form of a generator of control sawtooth signals connected by a channel to the chamber for supplying compressed air.