SU66434A1 - Device for automatic control of fluidity of coarse media - Google Patents

Description

The proposed method of automatic control of fluidity of coarse-optic liquid media is based on measuring the pressure loss of the medium flowing in the pipeline by means of asos weights.

A gear pump 1 pumps a controlled medium through a pipeline 2 of a known length at a speed corresponding to the laminar mode of motion. The stator of the motor 5 (with a short-circuited rotor), which rotates the pump, is installed in bearings and equipped with a pulley 4 with a variable radius on which a cable with a load 5 is wound. On the stator there is a reinforced / 1 arrow pointer 6 of its angle of rotation.

When the motor does not work, the load keeps the stator in position of the HaHMesibuiero: ent. image ligo them on a pulley, i.e. turn pulley); ut to the load shoulder with its smallest radius; with this, the pointer arrow is at zero. When the motor takes effect and the pump begins to pump the controlled medium, the stator with the valve and

the arrow under the influence of the torque will rotate in the direction opposite to the rotation of the rotor, increasing the shoulder on which the load acts. This rotation will occur until the load moment balances the motor torque.

The torque of the motor depends on the pump load, expressed as the product of the pressure on the volume of the pumped medium. This volume depends only on the number of revolutions of the gear pump, which in this case is unchanged. The pressure is determined by the hydraulic resistance of the pipeline that drains the medium from the pump.

The friction head loss during laminar movement of the medium through the pipeline is directly proportional to its dynamic viscosity and average speed and inversely proportional to the square of the diameter of the pipeline. With a constant cross section of the pipeline and a constant speed, due to the constant volume of liquid. head loss will depend only on the dynamic viscosity characterizing the fluid content of the medium. Thus, torque rolling on the shaft

pump is determined by the loss of pressure spent on overcoming the friction of the medium pumped through the pipeline.

Since the flow factor as applied to pipe-like liquid media is taken as an indicator of pipe transportability, this method of control most fully reflects the entire sum of factors influencing the flow of the 1PO pipe and the very high flow rate Mbtx. The difference between the radius O | V W: the kiva must correspond to the difference in the torques, the pump, determined by the range of change in the fluidity of the coitrolled medium. This margin is placed at a certain value of the angle of rotation of the stator of the motor, and its scale is calibrated in relative or absolute units of fluidity. On the axis of the pointer, besides the arrow or the pen of the local recorder, a contact system for signaling and a transmitter of distance indications can be installed, as well as a device for automatically regulating the corresponding technological process.

Subject invention

Device for automatic control of fluidity of coarse media measurement of pressure loss controlled srbdy. Flowing through the pipeline in laminar mode, characterized in that for determining the pressure loss, gear pump I, which pumps the medium through pipeline 2, and motor 3 mounted in bearings and equipped with a variable radius pulley 4 and load 5, are determined.

V /// 7 // // 7 // //