RU2442020C1 - Metering unit for reactant's input into the pipeline - Google Patents

Abstract

FIELD: metering equipment.

SUBSTANCE: device refers to the metering equipment and has to do with the metering pump equipment. The device nature has to do with the pipeline (1), built-in narrowing equipment (2), connected with a nozzle (3), with boost pressure and nozzle (4) with diminished pressure with a sleeve valve (5), supplied with a production control (6) (adjustable orifice). The sleeve valve (5) nozzle (7) is connected to the inline hydraulic motor (8), made as a double acting fluid power cylinder. Fluid power cylinder's piston rod (8) is connected to the plunger piston (9) of the metering fluid powered cylinder (10) the working circuits of which are connected through the valves (11) with the tank (12) for reagent and through the valves(13) - with the splitter (14), placed in the pipeline (1).

EFFECT: corrosion prevention and emulsion breaking.

1 dwg

Description

The invention relates to a metering technique, relates to metering pump units and can be used to supply a specified amount of liquid reagent to the pipeline per unit time in order to prevent corrosion (inhibitor), delamination of the emulsion (demulsifier) or other reagents.

Known hydraulic metering pump containing a pump chamber separated by an elastic separator from the intermediate chamber connected to the source and drain the drive medium, equipped with a hydraulic valve of the pressure difference in the drive and intermediate chambers [ed. testimonial. SU No. 667684, cl. F04B 13/00, 1979].

A disadvantage of the known device is its complexity due to the presence of many structural elements, as well as insufficient dosing accuracy when working with a variable flow rate in the pipeline.

The closest in design and the achieved results is a dispenser for liquid reagents, adopted as a prototype, containing a sectioned narrowing device and a reservoir for the reagent, communicating by means of impulse tubes with control valves. The constriction device is built into the pipeline and, using the pressure difference that arises in the pipeline before and after the constriction device, to increase the pressure in the tank, promotes the outflow of liquid reagent from the tank under pressure through the calibration nozzle into the pipeline [RU patent for utility model No. 52972, class . F17D 3/12, 2006].

The disadvantage of this dispenser is its functional limitation, due to the ability to work only at high flow rates in the pipeline, and the instability of work at low speeds, which reduces the accuracy of dosing.

The task is to increase the dispenser functionality and metering accuracy over a wide range of fluid flow rates in the pipeline.

The technical result that can be obtained by carrying out the invention:

- obtaining energy for the operation of the dispenser from the fluid flow, while no other energy source is required;

- automatic adjustment of the specific amount of reagent supplied to the pipeline depending on the flow rate;

- simplicity of design, reliability, low cost;

- extended reagent dose adjustment range.

The technical result is achieved by the fact that in the dispenser for supplying the reagent to the pipeline containing the constriction device integrated in the pipeline, the reagent tank, connecting tubes, in contrast to the prototype, the dispenser is equipped with a linear hydraulic motor made in the form of a double-acting hydraulic cylinder with a spool distributor, and a double-metering hydraulic cylinder action, the stem of the hydraulic motor is connected to the plunger of the metering hydraulic cylinder, and the working cavity of the metering hydraulic cylinder is connected through valves to the reservoir for the reagent and the pipeline, and the spool valve is equipped with a dispenser performance controller made in the form of an adjustable throttle.

The drawing shows the design of the dispenser.

A restriction device 2 is built into the pipeline 1, connected by a high pressure pipe 3 and a low pressure pipe 4 with a spool valve 5 equipped with a capacity controller 6 (adjustable throttle). The spool valve 5 nozzles 7 is connected to a linear hydraulic motor 8, made in the form of a double-acting hydraulic cylinder. The hydraulic motor rod 8 is connected to the plunger 9 of the metering hydraulic cylinder 10, the working cavities of which are connected through valves 11 to the reagent reservoir 12 and through valves 13 to a divider 14 placed in the pipe 1.

The dispenser works as follows.

A narrowing device 2 is built into the pipeline 1 (see the drawing), having a section with a reduced passage section. In accordance with Bernoulli’s law, the fluid flow rate in this place increases and the pressure decreases. As a result of this, a pressure difference arises between the nozzles 3 and 4, which is the energy source for the movement of the working piston of the linear hydraulic motor 8. The spool valve 5 switches the fluid flow, supplying it alternately to the opposite compartments of the hydraulic motor cylinder 8, thereby ensuring a continuous reciprocating movement of the piston. The stem of the hydraulic motor 8 is connected to the plunger 9 of the metering hydraulic cylinder 10, which, making the same movements as the stem of the hydraulic motor 8, draws in reagent from the reservoir 12 through the valves 11 and pumps it through the valves 13 into the pipeline, through the divider 14. Adjusting the dose of the reagent supplied in the pipeline per unit time, produce an adjustable throttle 6.

An example of the operation of the dispenser.

With a static pressure in the pipeline 1 equal to 6 kgf / cm ² , a flow velocity of 5 m / s and a pipe diameter of 400 mm, the narrowing device 2 reduces the cross-sectional area by 25%. The pressure difference between the pipe high pressure 3 and low pressure 4 is 2.2 kgf / cm ² . Regulator 6 sets the value (amount of supplied or introduced reagent) of the introduction of the reagent in the range from 0.02 to 10 l / h. The maximum pressure at the outlet of the metering hydraulic cylinder is 10 kgf / cm ² . The specific value of the dose of the reagent (l / t - liter of reagent per ton of liquid) is automatically maintained as a value depending on the speed of the piston of the hydraulic motor 8, which is determined by the flow rate of the liquid in the pipeline. The accuracy of maintaining the dose is ± 2%.

The proposed pipette reagent dispenser finds industrial application for supplying a predetermined amount of liquid reagent to the pipeline per unit time in order to prevent corrosion (inhibitor), delamination of the emulsion (demulsifier) or other reagents.

Claims (1)

A dispenser for supplying a reagent to the pipeline, containing a constricting device, a reagent reservoir, connecting tubes, characterized in that the dispenser is equipped with a linear hydraulic motor made in the form of a double-acting hydraulic cylinder with a spool distributor, and a double-acting metering hydraulic cylinder, the hydraulic motor rod is connected to the plunger a metering hydraulic cylinder, the working cavities of the metering hydraulic cylinder being connected through valves to the reagent reservoir and the pipeline, and the spool valve the distributor is equipped with a dispenser performance controller made in the form of an adjustable throttle.