SU1719916A1 - Fluid dispenser - Google Patents

Abstract

The invention relates to a measurement technique and can be used in metering systems for dispensing a predetermined mass of liquid. The purpose of the invention is to increase at the same time formed doses with reduced overall dimensions. In the initial position, the pistons 5 and 6 are in the lower position, and the over piston region of the upper chamber 3 is filled with a metering liquid. Upon receipt of a control signal for dose dispensing at closed 17, 19, 20 and open P fl m from Otnosos Ј CO OE 25; 22

Description

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16 and 18 valves, the fluid through conduit 13 enters the subsurface region of chamber 3, causing the pistons 5 and 6 to rise. In this case, the liquid from the podporshne area of the chamber 3 through the pipe 11 enters the podporshne area of the chamber b. The lifting speed of the piston 6 is higher than the lifting speed of the fluid level. At a certain point in time, the float element 8 comes out of contact with the sealing element 22 of the piston 6. At the same time, the float valve 10 communicates the nadgore region of the chamber 1 with the atmosphere. When the fluid reaches a predetermined level, the buoyancy force

separates the float b from position sensor 9 and a signal from it is fed to the input of control unit 21, from which a signal is received to close valves 16 and 18 and to open valves 17, 19 and 20. Under the action of fluid entering the piston chamber 3, the pistons 5 and 6 are moved downwards, and the liquid from the piston areas of the chambers 3 is drained. Upon contact of the sealing ring 22 and the float element 8, the air above the surface of the liquid in chamber k is forced through the float valve 10 into the atmosphere, 1 sludge.

The invention relates to a measuring technique and can be used in metering systems for dispensing a predetermined mass of liquid used in various sectors of the national economy.

The purpose of the invention is to increase at the same time formed doses with reduced weight and size characteristics.

The drawing schematically shows the proposed device.

A device for dispensing a predetermined mass of liquid contains a metering cavity 1 consisting of upper and lower chambers 3 and 4 separated by a partition 2, in which two pistons 5 and 6 are mounted, connected by a hollow rod 7 through each other, as well as a float element 8 mounted on position sensor (contact sensor) .9. In the piston 6, a float valve 10 is installed connecting the sub-piston and supra-piston chambers of the lower chamber region k. The dosing cavity 1 is equipped with an overflow 11, a liquid 12, 13 and a drain And, 15 pipelines with corresponding shut-off valves 16-20 installed on them connected to the control unit 21. The seating surfaces of the pistons 5 and 6 and the hollow rod 7 are made with seals 22. The contact sensor 9 is connected to the control unit 21. The float element 8 is installed in the piston region of the lower chamber A coaxially with the stem cavity and

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provided with guides in the form of a vertically aligning rod 23 with an abutment 2C and a limiter 25 of movement.

The device works as follows.

In the initial position, the pistons 5 and 6 are in an extremely low position. The over piston region of the upper chamber 3 is filled with a dosing liquid. Upon receipt of a control signal for dispensing a dose with valves 17, 19, 20 closed, valves 16 and 18 open. A pump liquid (not shown) through pipeline 13 begins to flow into the piston region of the upper chamber 3, causing the piston 5 and associated with it piston 6 is raised. In this case, the piston 5 displaces the liquid from the over-piston region of the upper chamber 3 through the overflow pipe 11 to the sub-piston region of the lower chamber 4.

Due to the difference in the working volumes of the chambers 3 and formed due to the difference in volume of the hollow rod 7 and the float element 8, the lifting speed of the piston 6 is higher than the lifting speed of the liquid level filling the sub-piston region of the lower chamber V, and after a predetermined period of time has elapsed contact with the sealing element 22 of the piston 6, and the liquid level in the chamber at this moment does not reach the level of the liquid corresponding to the given dose. In the process of moving

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When the piston 6 is in the upper position, the float valve 10 is in the open position, together with the over-piston region of the lower chamber with the atmosphere. When the liquid level in the piston region of chamber C reaches a level at which the buoyant force acting on the float element 8 compares with its weight, the latter is detached from the contact sensor 9 within the limits of the action of the limiter 25 with stop 2. The signal from the position sensor 9 goes to the control unit 21, from which the signal for closing the valves 16 and 1-8 and opening the valves 1 7, 19, and 20, with the result that fluid from the pump through conduit 21 enters the above-piston region of the upper chamber 3 and causes the pistons 5 and 6 to move to the lowest position. In this case, the liquid from the podporshnevoy area of the upper chamber 3 through the pipeline enters the drain.

At the same time, when the sealing ring 22 enters the contact with the float element 8, the air above the liquid in the chamber kt is expelled through the float valve 10. When the bottom surface of the piston 6 reaches the liquid in chamber k, the float valve 10 closes and the fluid is displaced by the piston 6 through the drain pipe 15. Thus, when the pistons are moved to their initial lower position, two equal doses are simultaneously displaced from the sub-piston areas of the upper and lower chambers 3 and C, i.e. a double dose of plums

The equality of these doses is ensured by the fact that during the process of moving the pistons into the lower chamber, a quantity of liquid is displaced equal to

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Claims (1)

for the device entering the podporshnevuyu region of the upper chamber 3. The formula of the invention A device for dispensing a predetermined mass of liquid, comprising a metering cavity with a float element mounted for interoperability with a position sensor, a drainage manifold with shut-off valves associated with a control unit, characterized in that, in order to increase the doses simultaneously generated at reduced masses - coarse-sized characteristics, the dosing cavity consists of two chambers located one above the other and separated by a partition, in which two pistons are installed, which are interconnected through The hollow stem through the partition, the over piston area of the upper chamber is connected to the sub piston area of the lower chamber, the overflow pipe to the first shut-off valve, and the manifold inlet pipe through the second and third shut-off valves is connected to the super piston and sub piston regions of the upper chamber , and the manifold drain piping through the fourth and fifth shut-off valves are with the piston areas of both chambers. This position sensor is located on the bottom of the lower chamber and is connected to the input of the control unit, the first the fifth outlets of which are connected to the corresponding shut-off valves, and the piston and overhead piston areas of the lower chamber are interconnected by a float valve, the lower piston is provided with a sealing element placed in the central hole, and the float element is installed in a piston region of the lower chamber coaxially with rod cavity and provided with guides. 0 15 0 five five