SU1455239A1 - Metering apparatus - Google Patents

Abstract

The invention relates to liquid dispensing devices and improves the accuracy of microdosing. The needle 3 is lowered into the dosed liquid and the rod 6 is moved to the extreme left position. The stop 14 mounted on the free end of the rod 6, interacting with the additional compacted piston II placed on the rod with the possibility of movement, also moves it to the left. The intermediate fluid in the cavity between the pistons flows through a check valve 9, made in a sealed permeable 10 installed in the housing between the porsche 5 and the rod 6. At the same time, the piston 5 moves to the left and the dosage is sucked into the cavity 4. To deliver a dose, the needle is in contact with the surface to which the dose is applied, press the cup 7, moving it to the tip 2, which is designed as an adjustable stop. Installed with the possibility of entering into the input channel 13 of the second oppositely directed check valve 8 of the hermetic septum 10, the free end 12 of the rod 6 displaces from channel 13 through the valve 8 a volume of intermediate fluid equal to the dose. As a result, the piston 5 moves to the right while withdrawing a predetermined dose. 1 hp f-ly, 1 ill. with c /)

Description

I The invention relates to a device for dispensing liquids.

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

The drawing shows the proposed dispenser.

The dispenser includes a housing 1 with a needle 3 3, which is grounded in its tip 2. The cavity 4 of the tip is intended for the metered liquid. The piston 5 is installed in the housing 2 1, the piston rod 6 mounted on the housing 1 with the movement of the cup 7, is made with two oppositely directed check valves 8 and 9 and there is a leak-proof baffle 10 between the piston 5 and the piston rod 6 and The additional 4th piston 11 is sealed, installed with the possibility of movement on the rod 6, the outflow end 12 of which is located | with the possibility of entering into the inlet p | anal. 13 of the valve 8 and, with a stop 14 for the additional piston. The space between the pistons is filled with an intermediate liquid 15 (for example, with machine oil). A spring 16 is placed between the body 1 cup 7. 1 The tip 2 is made in the form of an adjustable stop for the cup 7, and on Case 1 between the cup 7 and the tip (1 2 there is a scale 17.

The dosing unit works as follows.

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Before starting, the dispenser is filled with a metered liquid. For this, the needle 3 is dipped into the metered liquid. The rod 6 is moved to the extreme Q left position. Stop 14, interacting with an additional piston 11, move it also to the extreme left position. Intermediate fluid 15 flows through the non-return valve 9 into the increasing cavity between the baffle 10 and the additional piston 11. At the same time, the piston 5 moves to the left, and the metered liquid is sucked into the cavity 4. Air from cavity 4 is removed by moving the shaft. Compiler N. Nemtseva Editor A. Revin Tehrer M.

Order 7446/49 Circulation 660 Subscription,

VNSHSH of the State Committee on Inventions and Discoveries at the State Committee on Science and Technology of the USSR 4/3, Moscow, Zh-35, Raushsk nab. 113035

Claims (2)

one . A dispenser containing a tsipindric body with a needle in which a piston and a rod are mounted in a fitted on the body with the possibility of moving the glass, characterized in that, in order to improve the accuracy of microdosing, it is equipped with two oppositely directed check valves and placed in the housing between the piston and the rod, a sealed partition and an additional sealed piston mounted for movement on the rod, the free end of which is located with the possibility of entering Khodnev channel of one of the valves and configured to further focus the piston, wherein the space between the pistons is filled with an intermediate liquid, and between the cup spring and the housing is placed. 2. The dispenser according to claim 1, which is distinguished by the fact that the body is equipped with an adjustable stop for the glass. 6 to the right on the principle of removing air from the syringe. To dispense the dose, the needle 3 contacts the surface to which the dose of liquid is applied and press the cup 7, moving it all the way to the tip 2. At that, the rod 6, moving towards the needle, displaces the volume 8 through the valve 8 through the valve 8. the intermediate fluid, separate the dose. As a result, the piston 5 is moved to the right, squeezing out a predetermined dose through the needle 3. The force is then removed from the cup 7, which is returned to its original position by the action of the spring 16. Further, the dose delivery cycle is repeated. The dose volume is changed by moving the tip 2, the position of which is established on a scale 17. Ф о рм ул and the invention one . A dispenser containing a tsipindric body with a needle in which a piston and a rod are mounted in a fitted on the body with the possibility of moving the glass, characterized in that, in order to improve the accuracy of microdosing, it is equipped with two oppositely directed check valves and placed in the housing between the piston and the rod, a sealed partition and an additional sealed piston mounted for movement on the rod, the free end of which is located with the possibility of entering Khodnev channel of one of the valves and configured to further focus the piston, wherein the space between the pistons is filled with an intermediate liquid, and between the cup spring and the housing is placed. 2. The dispenser according to claim 1, which is distinguished by the fact that the body is equipped with an adjustable stop for the glass.