SU1219924A1 - Arrangement for liquid-metering - Google Patents

Abstract

The invention relates to the dosing of highly viscous and pasty liquids and makes it possible to improve the dosing accuracy. The liquid is dosed through the distributor, 5 flows, controlled by block 9, alternately enters cavity 3 or 4 of the measuring chamber 1, moving the floating piston 2 until the spring ring 13 enters the groove 16. Dose adjustment is made by limiting the stroke of the compacted plunger By using the stop 7 of the dose corrector 6, to which a control signal is applied, which is proportional to the deviation of the monitored parameters of the fluid from their nominal value. A minimum dose of fluid is dispensed in one double stroke of the floating piston. A sensor 8 of physical parameters is connected to the control unit. 1 il. // / Y / Y /: / X / I (P with § tL Yu: o with bo 4:

Description

This invention relates to the dosing of highly viscous and pasty liquids.

The purpose of the invention is to improve the accuracy of dosing.

The drawing shows a schematic diagram of a device for dispensing a liquid.

The device contains a measuring chamber 1 with a floating piston 2, the end cavities 3 and 4 of which are connected to the dispenser 5 dispensed fluid flows, the dose corrector 6 with a movable stop 7 placed in the end cavity 3 and the sensor 8 of the physical parameters of the dispensed fluid connected to the control unit 9, sealed plunger 10 and rod 11, valve 12 with shank and spring ring 13. In the piston 2, a cylindrical axially hollow cavity 14 is made, which communicates with the end cavity 4. Inside the cavity 14, a sealed plunger 10 is installed.

1219924

The piston 2 is stationary, the valve 12 is open, and the fluid pressure moves the plunger 10 to the extreme right position, the liquid is partially displaced

5 from cavity 4 and fill cavity 14 with metered liquid. After the filling of the cavity 14 with the metered liquid is completed, the pressure in the cavity 3 increases and moves the floating port 10 to the extreme right position until it stops in the cavity of the measuring chamber 1. The liquid from the cavity 4 goes to the consumer. Further, the cycle is repeated in the described sequence.

Thus, the delivery of the minimum dose of fluid is carried out in one double stroke of the floating piston 2, and the dose adjustment occurs at

20 movement of the piston 2 only in one direction by limiting the stroke of the plunger 10 by stopping the 7 of the corrector 6, to which block 9 responds a control signal proportional to the deviation of the control in the closed end 15 of the piston 2 of the parameters to be set

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 Flax compacted rod 11 and valve 12, the shank of which is spring-loaded and located in the end cavity 3. Spring ring 13 Mounted on the outer surface of the piston 2, and the inside cylindrical surface of the measuring chamber 1 is provided with an emphasis dp of the spring ring 13, made in the form of an annular groove 16. The liquid metering device operates as follows.

Metered liquid from the power supply system (not shown) through the distributor 5 flows, controlled by block 9, alternately enters the cavity 3 or 4 of the measuring chamber 1. If the metered liquid enters the full 4 of the measuring chamber 1, then it moves the floating piston 2 to the left and displaces the dose from cavity 3 to the consumer. The movement of the floating piston 2 to the left occurs until the spring ring 13 enters the groove 16 of the metering chamber. In this position, the valve 12 is open and the plunger 10 displaces the fluid from the cavity 14 to the closure of the kinematic chain: the plunger 10 — the compacted rod 11 — the stop 7 of the corrector 6. Then, following a command from the control unit 9 through the flow distributor 5, the valve is metered; cavity 3 dimensional camera 1, while floating45

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their nominal value.

Adjusting the dose with the additional plunger is smaller; Shego size with the same metering capacity improves the metering accuracy by significantly reducing the deformation of the stop corrector group and reducing the fluid volume error in the plunger 10 closely spaced per unit length of its stroke.

Experimental studies of a device for dispensing a liquid have shown that its design is simple, reliable in operation and ensures the accuracy of dispensing liquid 0.3%.

Claims (1)

Formula A device for dispensing a liquid containing a metering chamber with a floating piston, the end cavities of which are connected to the flow distributor of the meterable fluid, a dose corrector with a moving stop located in the first end cavity of the metering chamber and a sensor of the physical parameters of the meterable fluid to the unit control, which is characterized by the fact that, in order to increase the accuracy of dosing, a compacted plunger and a stem, a valve with a shank and a spring ring are inserted into it, their nominal value. Carrying out the correction of the dose size with an additional plunger of a smaller size with the same capacity of the dispenser improves the accuracy of dosing due to a significant decrease in the deformation of the stop corrector group and a decrease in the error of the volume displaced by the plunger 10 per unit length of its stroke. Experimental studies of a liquid dispensing device have shown that its design is simple, reliable in operation, and provides a liquid dispensing accuracy of 0.3%. Formula A device for dispensing a liquid containing a metering chamber with a floating piston, the end cavities of which are connected to the dispenser of the flows of the metering fluid, a dose corrector with a movable stop located in the first end cavity of the metering chamber and a sensor of physical parameters of the metering fluid connected to the control unit, characterized in that , in order to improve the metering accuracy, a sealed plunger and a stem, a valve with a shank and a spring ring are inserted into it, 3 12199244 deaf axial cylindrical position in the first end cavity The bridge, which communicates with the second-dimensional camera, a spring ring end cavity of the measuring chamber willow. installed on the outer surface which has a sealed plunger piston, and an internal cylindrical zher, in the closed end of the set-j surface of the measuring chamber is equipped Flax compacted rod and valve, cone-support for the spring ring, which reamer is spring-loaded and filled in the form of an annular groove.