SU1436013A1 - Viscometer - Google Patents

Abstract

The invention relates to a measurement technique, in particular, to devices for automatically measuring viscosity, and may find application in various industries. The purpose of the invention is to improve the accuracy of measurement of liquid media in process equipment. This is achieved by the implementation of the control unit and dosage, its mechanism on the elements of pneumatic automation. 1 hp f-ly, 1 ill.

Description

four:

00 SP)

The invention relates to a measurement technique, in particular, to devices for the automatic measurement of viscosity, and may find application in various industries, for example in the chemical, oil refining and others.

The purpose of the invention is to improve the accuracy of measurement of liquid media in process equipment.

The figure shows schematically the design of the viscometer.

The measuring unit 1 is loaded into a controlled HIT, a bone 2 in the process unit 3. The measuring tank 4 with a capillary tube 5 of the leak is rigidly fixed on the technological apparatus 3. In the upper part of the measuring tank 4 there is a dish-shaped clan 6 connected gas supply tube 7 with a rigid movable bottom 8 bellows unit 9. The first input 10 of the bellows unit 9 is connected to the input 11 of the control unit 12 and to the input of the secondary device

13. The control unit 12 contains a summatter

14, the inputs of which are connected to the setting device

15 and with the input 16 connected to the cavity above the controlled liquid in the process device 3. The output of the adder 14 is connected to the input of the relay 17, which implements the logic function “Inhibit, the control of which input is connected to the output of the trigger 18 with separate inputs, to the output 11 unit 12 unravlersch and to the input of m.pulsator 19, the output of which is connected to

20 trigger 18 with separate entrances. entrance

21 of the trigger 18 is connected to the output of the inverter 22, to the input of which is connected the output of the gnuvmorel 17. realizing the logical function "Inhibit and trigger code 23 of the control unit 12. The output 23 of the control unit 12 is connected to the space 24 between the strong- (zones, which, in turn, are connected to the measuring tube via the gas-extracting tube 7; 1 capacity 4.

The viscometer operates the following way. The initial time of the dose of the monitored liquid flows out of the measuring tank 4 under the action of an overpressure P is + Increment in the measuring tank 4; - pressure at the outlet of the setting device 15; РЗ - pressure in annarate 3 with controlled liquid through the capillary tube 5 of expiration. Ka

The pill tube 5 of the expiration exerts a slight resistance to the passage of P1.e. through the air, therefore the pressure C, in the measuring capacitance after the expiration of the expiration, almost instantaneously decreases, accepting the value

R

 - tf ll,

0

0

50

five

0

five

where is the static pressure; About ys, - density controlled

liquids;

U acceleration of free fall;

1 immersion depth of the measuring vessel with a capillary flow tube; G40 is the pressure in the measuring vessel after the end of the dose of the controlled liquid.

Pressure, “Pr; is fed to the input of the inverter 22, at the output of which a single level signal appears, i.e. 2 1 By the signal F 1, the flip-flop 18 with separate inputs is transferred to the state with output pressure 1.

The pressure from the trigger output 18 P 1 to the control input of relay 17 prohibits the passage of pressure P P the cavity of the measuring capacitance 4.

The distance 1 is fed to the inlet 10 of the bellows unit 9 and relocates the rigid bottom 8. This interleaving is transmitted through the gas supply tube 7 to the disc valve 6, which then moves down and opens the access of the controlled fluid into the cavity of the measuring tank 4. Measuring container 4 is filled with a controlled liquid 2. The volume of the controlled liquid participating in the analysis is a constant value equal to the volume of measuring container 4.

Pressure 1 enters the inlet of the impulse 19. After time t, the pulsator triggers and pressure 20 arrives at the input 20 of the flip-flop 18 with separate inputs, by which the flip-flop 18 is switched to a state with a zero output signal (Pig O).

The pressure P., g 0 removes the prohibition from the relay 17 to apply pressure from the output of the adder 14 to the cavity of the measuring capacitance 4. Under the action of the pressure supplied to the measuring capacitance 4 (Pi,) and the spring installed in the bellows unit 9, when it enters the inlet 10 of the bellows pressure unit 0, the disc valve 6 is closed.

The fluid flows out under the action of the pressure difference lRR5-Pr from the measuring tank 4. The expiration time of the volume of the controlled fluid is determined from the equation of Poiseyl

CJ.JV ..

 “F i and.

-uzh.I,

where C, d. is the length and diameter of the expiration of the capillary tubing 5;

jti c-viscosity of controlled fluid.

Since Р Р,, we can assume that after the entire dose of the circulating fluid has expired, the process of changing the states of the control unit and the measuring unit occurs as described.

Pulses arrive at the input of the secondary device 13, the period T of which determines the viscosity of the controlled liquid, i.e.

T t + t "A - fB.,

where a t; . JS / CR

Claims (2)

Claim 1. Viscometer containing meter2. A viscometer according to claim 1, characterized in that the dispenser contains a bellows a tank with a capillary tube, an outflowing block, a gas supply tube and a disk, a metering unit, a control unit including a valve located in the upper part of the outlet, a setpoint generator, an inverter, an amplifier, and a secondary device the fact that, in order to compute the accuracy of measurement of liquid media in technological equipment tanks, the first input of the bellows unit is connected to the trigger output with separate inputs, the second j .- „- -g- - - -,“ the input of the bellows unit is connected to the outlets, the control unit additionally consists of a relay realizing a logical function holding a relay realizing the logical function- “Inhibiting, besides the plate valve connected by a gas supply tube with a bellows block. “Ban, adder and trigger with separate inputs, while the input is measuring 0 The capacitance is connected to the output of a relay that implements the logic function “Inhibit” and to the input of the inverter, the output of which is connected to the first input of the trigger with separate inputs, the second input of which is connected to the output of the pulser. and the trigger output with separate inputs is connected to the secondary inputs of the secondary device, the pulsator, and the relay implementing the logic function “A ban connected by its input to the output of the adder, whose inputs are connected to the setpoint and to the space above the liquid in the process unit. 2. Viscometer according to claim 1, characterized in that the dispenser contains a bellows 5 block, gas supply pipe and a disc valve located in the upper part of