SU1332272A1 - Liquid level regulator - Google Patents

Abstract

The invention relates to devices for regulating liquid in containers and can be applied in the chemical, metallurgy, petroleum and other industries. The level regulator contains overflow 9 and drain 13 nozzles installed in an airtight tank 1, level adjuster 18, control unit 21, shut-off elements 6 and 8. Installation of a cutter 10 and filter II in the cut-off of the outlet nozzle 9 and filter II in the drain nozzle 13 frequency flow meter 14 and adjustable throttle and the connection of the frequency flow meter 14 with the control unit 2 provide enhanced functionality, improved accuracy and speed. 1 il. (L with so tsD Yu

Description

one

The invention relates to the field of liquid level control in tanks and can be applied in the chemical, metallurgical, petroleum and medical industry to automatically control the level of liquid in closed tanks under high pressure.

The aim of the invention is to enhance the functionality, increase the accuracy and speed of the controller.

The drawing is a schematic of a fluid level regulator.

The regulator contains a sealed tank 1 with a channel 2 of pressure Pg and a check valve 3 n installed in it, an adjustable throttle 4, a gas channel 5 and a fast-acting locking element 6 installed in it, channel 7 of pressure P. in the bottom of a sealed tank 1 and installed in it high-speed locking element 8, overflow pipe 9 installed on it. cut calibrated jet 10, the diameter of the channel which is incommensurably smaller than the diameter of the overflow pipe 9. On the cross section of the overflow pipe 9 is also installed filter 11 fine cleaning. The rotary actuator coupling 12 provides a telescopic connection for the overflow pipe 9 and the drain pipe 13, which is rigidly connected to the rotary drive 2, the overflow pipe 9 rotates together with the sleeve and the drain pipe 13 can move or extend out of the overflow pipe 9, while the drain pipe 13 does not rotate.

In the output channel of the drain pipe 13 consistently installed frequency flow meter 14 and an adjustable choke 15 ,. The rotary actuator 12 through a kinematic connection of the gears 16 and 17 is connected to the setter

18 levels The output of the frequency consumption of the 14 through the amplifier-driver

19 and the frequency converter 20 is connected to the input of the control unit 21, the outputs of which are connected to the fast-acting locking elements b 8 of the sealed tank 1 and to the level adjuster 18.

The regulator operates as follows.

The working fluid under pressure Pj, loads through channel 2 sealed

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reservoir 1. In this case, the magnitude of the expansion. the stroke of the working fluid is determined by

adjustable throttle 4, and the magnitude of the pressure inside the sealed tank 1 depends on the pressure of the gas PUD111KI, the value of which is determined by the pressure of gas Pg entering the channel 5 through the high-speed locking element 6. At the same time, between the pressures Pav is 7 / P and PO. . Position- & Y: P dependency

niya

Wu in

preset level of

0

five

Tank reservoir 1 is determined by

5 the position of the overflow pipe 9, on the cut of which is installed the jet 10 and the filter P fine cleaning. Orientation of the overflow pipe 9 inside the hermetic tank 1 is carried out by a rotary drive 12 through the kinematic connection of gears 16 and 17 and level adjuster 18.

The automatic mode of maintaining the liquid level in the hermetic tank 1 is as follows.

The internal cavity of the overflow 9 and drain 13 nozzles 5 prisoners

0 between the jet 0 and the frequency flow meter 14 with the flow throttle 15, turned into a closed cavity of variable volume elastic, whose elasticity depends on the position of the liquid level relative to the upper cut of the overflow pipe 9 and the jet 10. For example, when the liquid level rises the overflow pipe 9 with the nozzle 10 is flooded and through the nozzle channel 10 into the closed cavity of a variable elastic volume with pressure P there is a flow rate, which is measured by the flow meter 14 and is defined as

g the diameter of the calibrated channel of the jet 10, and the flow rate through the adjustable throttle 15

The output frequency signal of the flow meter 14, the value of E: is costly proportional to the flow of fluid through the flow meter 14, goes to the amplifier-shaper 19., in the frequency converter 20, then to the control unit 21, with a flooded nozzle 10, the elasticity of the closed volume is minimal, as in the overflow channels the pipe 9 and the drain pipe 13 flows without liquid gas, resulting in the frequency of the output signal .-.

0

five

is minimal. In this case, the control unit 21 sends a command to simultaneously open the speed of action; their locking elements 6 and 8 and the liquid level in the hermetic tank 1 is lowered. The check valve 3 closes the channel 2 only in those cases when the pressure in the hermetic tank 1 is higher than the pressure Pg, for example, if the pressure source Pj is disconnected, the liquid level drops and a gas that sharply increases the elasticity of the closed volume starts to flow through the nozzle channel 10 and the frequency of the output signal of the flow meter 14 to the frequency converter 20 increases as the gas outflow rate through equal flow sections at the same pressure is higher than that of the liquid, which the control unit 21 notes and issues a command close the shut-off elements 6 and 8, and the level begins to rise, since the gas pressure P above the liquid level can never be higher than the pressure Pg of the fluid in channel 2, and at the time of lowering the level it is always lower than the pressure P before throttle 4. At the same time, the jets installed in the channels 5 and 7 reduce the sharpness of the level and pressure fluctuations inside the hermetic tank 1.

The possibility of influencing the magnitude of the variable elastic volume by changing the length of the overflow channel 9 and the drain 13 nozzles, i.e. change the distance between the jet 10 and

Editor I.Nikolaychuk Order 3830/42

Compiled by T, 3-tavern

Tehred I.Popovich Proofreader M.Demlnk

Circulation 863. Subscription

BNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow ,. Zh-35, Raushsk nab., D, 4/5

Production and printing company, Uzhgorod, st. Project, 4

13322724

A flow meter 14 with a flow restrictor 15 increases the ability to control the speed of the entire system. - So for example, with the decrease of this

the distance increases, and, conversely, decreases with increasing.

Claims (1)

10 claims A fluid level regulator containing an overflow and drain pipe installed in a sealed tank, interconnected, a rotary actuator rigidly connected to the drain pipe and connected to a level sensor, a control unit, stop elements, 20 s in order to expand functionality, higher accuracy and speed, it contains a filter and a jet mounted on the cutoff overflow pipe, the diameter of a calibrated channel is smaller than the diameter of the overflow pipe, a frequency flow meter and an adjustable 30 choke that are installed with displacement to form a variable elastic volume between it and the jet, with the output of the frequency flow meter connected to the input of the control unit, the outputs of which are It is connected with the locking elements installed in the gas cavity of the hermetic tank and in its bottom, as well as with the inlet of the level setter.