SU63971A1 - Instrument for measuring or controlling the flow of liquids - Google Patents

Description

Instrument for measuring or controlling flow

SaiiB.neHO May 28, 1940 in the People's Commissal No. 950 (319873) Published on August 31, 1944

It is known to measure the flow rate of liquids by the functional relationship between the flow rate of the fluid, the diameter of the outflow hole and the pressure taken to overcome the flow resistance during outflow. To measure the flow rate of liquids, this method uses an instrument consisting of a pressure vessel: one with a supply pipe and a hole for the flow of liquid, the flow rate of which is determined by a pressure gauge. The measurement range of such devices is small. In order to expand this range, it is proposed to connect a pressure vessel to a second pressure vessel equipped with a drain hole for the liquid; this second pressure vessel is connected to the third, etc., depending on the range required.

In FIG. 1 shows a schematic diagram of the proposed device, FIG. 2 is a schematic of an installation for automatically controlling the power of the machines.

The supply line 1 is connected by means of a control valve 2 to the first pressure liquids

court 3 device. The vessel 3 is connected by means of a tee 4 to the first nozzle 5, having a hole diameter corresponding to the first adjustment range (measurements).

When the control valve 2 is opened, a jet of liquid flows out of the nozzle 5, and in the pressure vessel 3 the level is set corresponding to the flow rate of liquid from the supply line. At the same time, the same level is set in the measuring glass 6 and can be counted on a scale of 7, graduated by the weight of the liquid, flowed by the unit per time.

Upon further opening of the valve 2; -; t the moment when the liquid begins to flow. To flow through the connecting pipe 8 into the second pressure vessel 9. From this moment the liquid flows out of two nozzles 5 and 12. The scale of the 10 dimensional glass 13 is graduated to simultaneous expense from two nozzles.

The liquid flowing from the nozzles flows into the sink And, from which it is drained into the serviced

machine or machine. The diameters of the nozzles determine the ratio of the measurement ranges in which absolute quantities of the flowing fluid can be measured with sufficient accuracy. With a measurement range above 1: 6, the instrument must have two pressure vessels.

For expansion of the range or for operation in several ranges, an appropriate number of pressure vessels with nozzles should be used.

In order to automatically maintain a constant flow rate in cases where the pressure in the supply network fluctuates dramatically, we can recommend the circuit shown in FIG. 2. If you lock the valve and open the valve on the supply line, depending on the start and stop of the machine, it becomes very simple and fully automatic control system.

The proposed device for controlling and measuring the flow rate of liquids for feeding devices operating without pressure has the following advantages:

. 1. The device is reliable in operation.

2. The device is easy to manufacture and cheap.

3. The range of measurements of the device can be practically made by any (due to the number of nozzles).

4. The instrument has no elements that can disable it or distort readings (mercury entrainment into the pipeline from differential pressure gauges, sticking of the rotor in rotameters).

5. The instrument requires a very small head for incorporation into the system (almost from 0.05 to 0.1 atm).

6. The instrument makes it possible to very simply resolve the issue of automatically maintaining a given flow rate.

Subject invention

A device for measuring or controlling the flow of liquids using a pressure vessel connected to the supply pipe and provided with a drain hole for the liquid, characterized in that to expand the measuring range or adjust the device, the pressure vessel S is connected to the second through the drain nozzle 8; pressure vessel 9, provided with a drain hole for the liquid and connected, if necessary, with the next pressure vessel.

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