SU1620055A3 - Siphon-type metering apparatus - Google Patents

Abstract

The invention relates to dispensing devices and improves reliability. The fluid coming in from the discharge pipe 1 fills the intermediate tank 3. When the liquid level is sufficient to trigger the siphon L tube 4, the working volume of the intermediate tank 3 is drained into the measuring tank 5. The cross section of the siphon tube in its inflection point with dimensions along the vertical X and horizontally Y, satisfying the corresponding, 2tfcos9, 1 | wearing X ----- - - j h, where and is the surface tension of the liquid being dosed; p is its density; 9 shows the wetting angle of the internal surface of the siphon tube dispensed with liquid; g is the acceleration of free fall; h is the distance from the upper edge of the intermediate tank to the upper boundary of the inner surface of the siphon tube, excludes the spreading of the liquid in the horizontal plane. 5 hp f-ly, 3 ill. - 7 o $ (L

Description

6

B

Ryle

FIG. one

X

a i)

 h,

The invention relates to a device for dispensing liquids and is intended to be used mainly in systems for dispensing large volumes of liquid, in particular for irrigating agricultural crops.

The aim of the invention is to improve the reliability of dosing.

1 shows a schematic representation of a siphon dispenser; Fig. 2 shows the siphon on the tube at the point of inflection, longitudinal section; on fig.Z - siphon dispenser, an example of implementation.

Siphon dispenser contains pressure head. pipeline 1 with adjustable flow of fluid 2, intermediate tank 3, communicated through a siphon tube 4 with a measuring tank 5 located under it with a discharge siphon: 6. The cross section of the siphon tube at the point of inflection is made with dimensions along the vertical X and horizontal Y, satisfying the ratio

2G cos

where G is the surface tension of the metered fluid; - density of the dosed liquid;

0 is the contact angle (wetting angle of the internal surface of the siphon tube to be dosed with liquid);

- acceleration of free fall

- distance from the upper edge of the intermediate tank to the upper boundary of the inner surface of the siphon tube.

The volume of the measuring tank 5 to the level 7 of the lower boundary of the inner surface of the outlet siphon 6 at the site of its bend is made multiple of the volume of one-time emptying of the intermediate tank 3. The end of the descending part of the siphon tube 4 is set at level 8 of the upper boundary of the inner surface of the outlet siphon 6 in the place of its bend.

When a siphon dispenser (FIG. 3) is implemented, the intermediate tank 3 with its lower part is placed inside the upper part of the measuring tank 5, with the lower boundary of the outer surface of the intermediate tank 3 located at the lower boundary of the inner surface of the discharge siphon 6 at the site of its bend. Bottom bottom

g

h

The daily tank is made with a cavity open from the side of the measuring tank 4, and the descending section of the siphon tube 4 is passed through the bottom of the intermediate tank 3. The cross-section of the measuring tank located above the lower boundary of the inner surface of the discharge siphon 6 in the place of its bend,

JQ is smaller than the rest of the section. The measuring vessel 4 is communicated with the atmosphere through the holes 9.

Siphon dispenser works as follows.

J5 Liquid 2 coming from the discharge pipe 1 fills intermediate tank 3. When the liquid level is sufficient to trigger the siphon tube 4, there is a discharge of the working volume of intermediate tank 3 into the measuring tank 5. Then the cycle repeats while at the next discharge of fluid from intermediate tank 3

25 into the measuring container 5, the level of the liquid in the measuring container does not reach the level of bending of the discharge siphon 6. At the same time, the level of the liquid in the measuring container directly corresponds to the level of the lower boundary of the inner surface of the discharge siphon 6 at the place of its bend. The next time the liquid 2 from the intermediate tank 3 is discharged into the measuring tank 5, the liquid level in the latter is higher than the level of the upper boundary of the internal surface of the discharge siphon 6, as a result of which the discharge siphon works and empties the measuring capaci-

to the bone 4.. ,

Then the cycle repeats.

Claims (6)

1. Siphon metering device containing 45 pressure pipe, intermediate tank, communicated through a siphon tube with a measuring container located under it with an outlet siphon, characterized in that, in order to increase the reliability of metering, the cross section of the siphon tube at the bend is made with vertical dimensions X and horizontals Y, satisfying the relation 55x 2 tfcosi (I + G. h X pgU yj where (j is the surface tension of the metered fluid; thirty 35 50 R 5162 - density of the dosed liquid; 0 is the contact angle (the angle of wetting is the internal surface of the siphon tube dispensed by liquid); g is the acceleration of free fall; h is the distance from the upper edge of the intermediate tank to the upper boundary of the inner surface of the siphon tube. 2. Dispenser of claim 1, characterized in that the volume of the measuring tank to the level of the lower boundary of the inner surface of the siphon at the point of its bending is made a multiple of the volume of one-time emptying of the intermediate tank. 3 Dispenser of 2 and 2, т т tl, which is due to the fact that the end of the descending part of the siphon tube is set at the level of the upper boundary of the inner surface of the siphon at the point of its bend - ten 15 20 25 4. A dispenser according to claims, characterized in that the cross section of the measuring container located above the lower boundary of the inner surface of the discharge siphon at the point of its bend is smaller than the cross section in the rest of it. 5. The dispenser according to claims 1 to 3, about tl and - the fact that the intermediate tank with its lower part is located inside the upper part of the measuring tank, and the lower boundary of the outer surface of the intermediate tank is located at the lower boundary of the inner surface of the discharge siphon in its place bend. 6. A dispenser according to claim 5, characterized in that the bottom of the intermediate tank is made with a cavity open from the side of the measuring tank, and the downstream portion of the siphon tube is passed through the bottom of the intermediate tank. WWKWVK W FIG. 2 6 Fig.Z