SU574618A1 - Liquid-metering device - Google Patents

Description

one

The invention relates to the field of dosing materials, in particular to devices for dosing liquids.

A device for metering liquids is known, which contains a container, a drain pipe and a valve 1.

Closest to the predlozhennym is a fluid dispenser, a saddle fluid, a housing with a working chamber, separated from the pressure source by a flexible separation membrane, a pressure supply line, an exhaust valve and an outlet fitting with a shut-off valve in the form of a spring-loaded membrane 2.

The disadvantage of such a metering device is that after the end of the cycle the dose is dispensed (droplets of the dispensed liquid drop from the outlet nipple due to the fact that part of the dispensed liquid remains in the body channel and in the outlet nipple.

The aim of the invention is to improve accuracy and reliability by eliminating the formation of droplets on (output.

This is achieved by additionally fixing the stem on the separation diaphragm, which is thrust through the diaphragm and installed with a gap between its end face and the spring-loaded diaphragm at the outlet, the gap in the initial position being shorter than the stroke length of the rod.

equipped with adjustable stop on the other hand.

The drawing shows the proposed liquid dispenser in the section.

The dispenser includes a housing 1, a separating membrane 2, separating the housing hollow on the working chamber A and chamber B for air, the inlet (inlet) valve 3, the outlet (exhaust) fitting 4, the outlet (shut-off) valve, made in the form of fixed in the housing 1 spring-loaded spring 5 of an immrane 6, shader 7 for the delivery of pneumo-pulses and a device for changing the dose value containing a pusher 8 fixed to the separation membrane 2 on the side of chamber B, spring 9 and an adjusting screw 10. On the separation membrane 2 with Torons working chamber A fixed rod 11 contacting the end of the stroke of the separation membrane 2 with an output of the valve membrane 6, wherein in the rest position the gap between shgokom 11 and the membrane 6 less than the length of the working stroke rod 11, which is defined by the distance between the shoulder in

and housing 1.

The dispenser works as follows. Before starting work, working chamber A is filled with a dosing liquid supplied through the inlet valve 3 under excess

pressure. Membrane 6 output claian

The spring shock 5 inpii adjusts to the response pressure (slightly above the inlet pressure of the liquid being metered). When lodcha through the nozzle 7 of the air pulse and chamber B separator membrane 2 (B1 together with the pusher 8 and HiTOKOM 11 moves to the left (according to the drawing). Under the action of the dosed liquid, clanan 3 is closed, and the membrane 6 of the output valve, moving to the left (ino drawing), opens the outlet 12 in the housing il, and the metered liquid is expelled through the outlet nozzle 4. At the end of the working stroke of the separation membrane 2, the rod 11 is wiped into the membrane b and moves with it Left to the left (according to the drawing) until the collar B is thick. does not upress IB korchus 1. Pa e The volume of the dose delivery cycle ends. When the chamber B is disconnected from the pneumatic network, the separating membrane 2 is reset by the action of spring 9 to the initial position. At the same time (at the initial moment, the rod 11 in contact with the membrane 6 prevents the hole 12 in the housing 1 from instantly closing due to What is the "dosing of the metered liquid from the outlet nozzle 4. With the further movement of the separation membrane 2 to the right (according to the drawing) the membrane 6 overlaps the opening 12, after which the inlet valve 3 opens and as it moves 2 separation membrane is filled chamber A dispensed liquid. The cycle is repeated. The dose is adjusted by the screw 10. The gap between the rod And and the membrane 6 in their initial position is chosen so that during the reverse course of the separation membrane 2, the metered liquid in the outlet nozzle 4 is sucked in

0.5-1 cm from its tip. At the same time, as already mentioned, this gap should be less than the length of the working stroke of the rod II, equal to the distance between the collar B of the pusher 8 and the walls of the housing 1.

The proposed ktsi dispenser design completely eliminates the dropping of droplets of the dosed liquid from the outlet fitting after the end of the dose delivery cycle, since the remaining liquid in fitting 4 is sucked in and held at atmospheric pressure.

Claims (2)

Invention Formula A fluid dispenser comprising a housing with a working chamber separated from the source by a flexible separation membrane, a pressure supply line, an inlet valve and an outlet with a shut-off valve in the form of a spring-loaded membrane, characterized in that in order to increase accuracy and reliability by eliminating the formation of droplets at the outlet, an additional stem is fixed on the separation membrane, passed through the membrane and installed with a gap between its end and the spring-loaded diaphragm at the outlet, the gap in the initial position being less than the length of the stroke of the rod, and the separating membrane is provided with an adjustable stop on the other side. Sources of information taken into account in the examination 11. Orlov S.P. Dosing devices. 1966, p. 147. 2. Copyright certificate № 351084, cl. G 01F II1 / 28, 1968.