SU1364890A2 - Apparatus for graduating metering tanks - Google Patents

Abstract

The invention makes it possible to increase the productivity of the device and expand the range of calibration. For this purpose, vessel 11 is connected to vessel 1 below the zero mark of the measuring tube 4 by means of pipe 9. The upper part of vessel 11 is in communication with the atmosphere through an opening 19 into which working fluid is poured in during preparation of the device for operation. Excess fluid is drained through the nozzle.

Description

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12, the upper end of which is installed at the same height with the zero mark of the measuring tube 4. After setting the liquid level in the tubes 4 at the zero marks of the scales 7, the locking element 10 is closed. When calibrating the dispenser, the fluid level is set to 1364890

in position B and deliver a dose to the wall of the measuring tank 5. Piston 2 movement: move the fluid to max, level C. The volume of the dose given is determined by the difference in the display - the scientific research institute for the level of liquid on the scale. 1 il.

The invention relates to instrument engineering and is an improvement of the device according to the authors. St. No. 1084618.

The purpose of the invention is to increase productivity and expand the range of calibration.

The drawing shows a device for calibrating liquid dispensers.

The device contains 1 in the form of a piston pump with a piston 2 and a rod 3. Capacity 1 is connected through a measuring tube (capillary) 4 with a measuring tube. Capacity 5, equipped with a removable cover 6. A scale 7 is located along the measuring tube. Rod stroke 3 of the piston 2 is limited in its lower position by a fixed stop 8. Capacity 1 is filled with a pre-calibrated fluid volume, which level is located at the zero mark of the measuring tube 7 (capillary tube). ra) 4 at the lower operating position of the rod 3 of the piston 2 on the stop 8 (position A).

To the upper part of the tank below the zero mark of the measuring tube 4 there is a vessel 11 connected to the atmosphere with a branch pipe 12 for discharging the liquid connected to the atmosphere through a connecting pipe 9 with a locking element 10. The nozzle enters the inside of the vessel 11, while the upper end of the nozzle 12. must be located at the same height as the zero mark on the scale 7 of the measuring tube 4, and the lower end of the nozzle is brought out of the vessel 11 to the outside of the drain funnel 13.

In order to increase productivity, several measuring channels can be combined in the device, similar in design to that described.

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And connected to the vessel 11, which are operated simultaneously by a common electromechanical actuator. The latter includes a transverse bar 14 to which the rods 3 of the pistons 2 are attached. The bar 14 is provided with rollers 15 which allow its free movement in the guides 16. The reciprocating movement of the bar 14 is carried out by means of an electric motor 17 through an eccentric 18.

The switching on and automatic switching of the electric drive in positions A and B is carried out with the help of micro-switches installed in the electric motor circuit 17. For the described case of combining several measuring channels in one device, vessel 11 is also common to all channels. The upper part of the vessel 11 communicates with the atmosphere through the opening 19. In this case, the locking elements 10 installed on the pipelines 9 from each measuring channel can be equipped with a common mechanical (or electromechanical) drive.

The device works as follows.

When the shut-off elements 10 are opened, the working fluid 1 fills the tank 1 and the vessel 1I through the opening 19. In this case, the liquid level in all measuring tubes 4 is automatically set to zero marks on the scales 7, as the excess liquid is drained through the nozzle 12 into the funnel 13. The stem 3 is at this in its lower position (bar 14 is located on stop 8). After setting the zero position, the locking element 10 is closed.

This is the end of preparation for work.

When calibrating or calibrating the dispenser using an electromechanical: actuator, set the liquid level to the position B, at which the latter is approximately at the boundary of the conical part of the measuring capacitances 5. Then, dispense the dispenser tip (with the covers 6 removed) sequentially deliver the dose to containers 5, then again close them with lids. Once again, it is discharged through pipe 12 in

The actuator is driven and the piston 2 continues to move upward until the eccentric 18 reaches the top dead center. In this case, the liquid in the measuring containers reaches the maximum level (position C), capturing the dose given and the liquid droplets deposited on the walls of the measuring container.

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Upon further movement of the actuator, the pistons 2 move down and stop using the microswitch in the initial position, in which the plaque 14 with the rods 3 of the pistons 2 is located on the stops 8. This completes the cycle of operation of the device. The difference in liquid level readings on scales 7 in each measuring capillary between zero and new level positions determines the volume of

doses directly in units of volume.

To measure the subsequent doses dispensed from the metering device, it is necessary to bring the liquid level back to the zero mark of the scale 7. To this end, the locking elements 10 are opened. At the same time, the liquid level in the measuring tubes is lowered by the principle of the communicating vessels and each measuring capillary, and the excess liquid is drained through the nozzle 12 in

funnel 13. The cycle is then repeated in the sequence indicated.

Claims (1)

Invention Formula A device for calibrating liquid dispensers according to bus No. 1084618, characterized in that, in order to increase productivity and extend the range of calibration, it is equipped with a vessel with a branch pipe for discharging liquid, the upper part of which is connected to the atmosphere, and the lower part is connected to the cavity of the measuring tube below its zero mark through a pipeline with a locking element, and the upper end of the nozzle To drain the liquid, it is installed at the same height with the zero mark of the measuring tube.