SU1474472A1 - Liquid metering device - Google Patents

Abstract

The invention relates to membrane dispensers for liquids and allows for a reduction in the diametrical dimensions, a simplified design and a reduction in fluid loss. The dosing fluid fills the working chamber 2 with the exhaust valve closed, the saddle 15 of which is located with a gap inside the seat 16 of the intake valve and is designed as a pipe installed with the possibility of longitudinal reciprocating movement, at the plugged end of which the drain holes 24 are made. The container (not shown) rests on a spring-loaded centering bell 26 placed on the plugged end of the pipe 17, lifts it, compressing the spring 25, and opens the drain holes 24. When compressed gas is supplied to the cavity 20, the membrane 18 with the pipe 17 is moved to the lower position, the exhaust valve seat is lowered below the inlet valve seat, which is closed by the membrane 14. After entering the compressed gas through the channel 12 connected to the cavity between the membranes 8 and 9, the latter starts move and push out a dose of fluid. To adjust the dose, the piston 5 is moved downwards and a part of the separation fluid from the cup 3 with openings 10 at the bottom is squeezed into the cavity between the cup 3 and the membrane 8, deforming the membrane 8.9, respectively, of the dose control unit and the working chamber, made in the form of elastic pipes, worn on the side surface of the glass and hermetically fixed in the covers of the housing 1. 1 Cp f-ly, 1 ill.

Description

one

The invention relates to membrane liquid dispensers and can be used to dispense aggressive liquids of various viscosities.

The purpose of the invention is to reduce the diametrical dimensions, simplify the design and reduce fluid loss.

The drawing shows the dispenser fluid. .

The liquid dispenser contains a cylindrical body 1 with a membrane working chamber 2, a dose adjustment unit made in the form of a glass 3 filled with a separating fluid 4 and closed with a sealed piston 5, the rod 6 of which is mounted so as to move along the thread in the cover 7, the membrane 8 and 9 The dose control unit and the working chamber, respectively, are made in the form of elastic pipes and are concentrically mounted on the side surface of glass 3 with openings 10 at the bottom. The ends of the membranes 8 and 9 are hermetically sealed in the lids of the housing 1. Between the upper ends of the membranes 8 and 9, a separating conical ring 11 is installed with a channel 12 connected to the cavity between the membranes 8 and 9 for supplying the control medium.

The working chamber 2 through channel 13 communicates with the inlet and exhaust valves, made with a common diaphragm 14. The saddle 15 of the exhaust normally closed valve is located with

the gap inside the inlet valve seat 16 and is made in the form of a pipe installed with the possibility of longitudinal reciprocating movement.

 The pipe 17 is fixed on the membrane 18 placed in the chamber 19, the cavity 20 of which is connected to the pressure source, and a return spring 22 is installed in the cavity 21.

The closed end of the pipe 17 is closed with a plug 23, the drain holes 24 are made and the centering bell 26 with the holes 27 is spring-loaded 25 mounted with the possibility of blocking these holes.

The chambers on either side of the diaphragm 14 of the valves communicate with each other through the holes 28, which are made on the periphery of the membrane 14.

The liquid dispenser operates as follows.

From the pressure tank (not shown) through the channel 29, the open inlet valve and the channel 13, the dispensed liquid fills the working chamber 2. When lowering the dispenser or lifting the container (not shown), the container neck abuts against the centering bell 26 and lifts it through the pipe 17, compressing the spring 25. The ruined end of the pipe 17 enters the neck of the container. When moving, the centering bell acts on a three-way two-way pneumatic valve (not shown), which causes a signal to supply compressed gas to channel 12 and cavity 20.

When compressed gas is supplied to the cavity 20, the membrane 18 with the pipe 17 is moved to the lower position. The exhaust valve seat 15 is lowered below the intake valve seat 16, which is closed by a diaphragm 14.

When a compressed gas is introduced with a delay in time through channel 12 into the cavity between membranes 8 and 9, the latter begins to move and force the liquid out of chamber 2 into the container, the air from which is removed through openings 27.

After draining the liquid from the working chamber 2, the dispenser is raised (or lowered the container), while the centering bell 26 is lowered through the pipe 17} turns off the three-way on-off pneumatic valve and the channel 12 and the cavity 20 communicate with the atmosphere. The pipe 17 under the action of the spring 22 rises up, rests against the membrane 14 and opens the inlet valve. The membrane 9 of the working chamber begins to return to its original position under the action of its own elasticity and the pressure of the fluid coming from the pressure tank, and the cycle repeats.

The bell 26 in the initial lower position closes the drain holes 24, preventing dripping, which reduces fluid loss.

To adjust the dose, for example, to reduce it, the piston 5 moves down and part of the separation fluid from glass 3 is squeezed through holes 10 into the cavity between the glass 3 and the membrane 8, deforming the membrane 8 and 9 and reducing the volume of the chamber 2.45

five

0 5 0

five

0 5

Connecting the chambers on either side of the valve membrane 14 increases reliability by equalizing the pressure.

Claims (2)

1. A fluid dispenser, comprising a housing with a membrane working chamber, communicated with membrane inlet and exhaust valves, filled with a separating fluid, a dose control unit with a membrane and a movable rod, a channel for supplying a control medium, characterized in that diametrically dimensioned, simplified design and reduced fluid loss, the membrane of the dose control unit and the working chamber are made in the form of flexible tubes, and the dose control unit is in the form of a separating fluid and a rod closed in the form of a compacted glass piston with openings at the bottom, on the side surface of which the indicated membranes are concentrically mounted, sealed with the ends in the housing covers, the channel for supplying the control medium to the cavity between the membranes, inlet and outlet valves are made with a common diaphragm, and the saddle of the outlet of a normally closed valve is located with a gap inside the seat of the intake valve and is made as installed with the possibility of longitudinal return - translational movement of the tube, at the end of which anechoic arranged to overlap its drain holes spring-loaded centering bell. 2. A dispenser according to Claim 1, characterized in that the chambers on either side of the valve membrane communicate with each other.