SU769374A1 - Method and device for determining gas pressure drop - Google Patents

Description

The fluids were pumped, the inner tube was equipped with a system for maintaining the level of the fluid, and the outer vessel was equipped with a system for measuring the position of the dividing line between the fluid and the gas, and the cavitator was moved.

The drawing shows the principle of the device.

The device contains an external vessel /, internal vessel 2, internal pipe 3, tube 4, external pipe 5, 1 extending tube 6, nozzle 7, cavitator 8, filling pipe 9, thermostatic and pumping system 10, photoelectric system (measuring the position of the line liquid-gas separation section 11.

The inner vessel 2 is installed in the upper part of the outer vessel /, -to the top lid of which the tube 4, the outer branch pipe 5 and the inner branch pipe 3 are attached, which serves for connection with pressure measurement points.

At the lower end of the tube 4, the cavitator 8 is disconnected. In the lower part of the outer vessel / liquid is poured, which through the filling nozzle 9 | And the inner nozzle 3 is pumped by the heat extinguishing system 10: into the inner vessel 2. fluid FROM: famous nip (in the drawing n-e shown). The outer vessel is equipped with an optical system for measuring the position of the liquid-gas separation line.

The device works as follows.

The pumping unit is switched on and the liquid flows from the bottom of the external vessel 1 through the 9 and the internal 3 nozzles into the internal vessel 2, where a constant level of liquid is maintained with the help of the level regulator.

When a liquid appears in the inner vessel 2, the latter begins to flow through the nozzle 7 and, colliding with the cavitator S, forms a cavitation cavity (“bubble”).

Since the tube 4 is lowered into the cavitation cavity 12 by the lower rip and connected to one of the measurement points by the upper end, then by connecting the outer nozzle 5 to another dimension, diameter or length ka: the vitation cavity in a fixed cross section will definitely be

determine the measured value of the differential pressure.

The described device will allow to increase the sensitivity when measuring small gas pressure drops.

Claims (3)

1. A method for determining the pressure drop of a gas using a liquid as a sensitive element is also distinguished by the fact that, in order to increase the sensitivity, one of the measured pressures is fed into the liquid cavitation cavity, and the other into the space surrounding the cavitation cavity, and The magnitude of the differential pressure is judged by the size of the cavitation cavity. 2. A device for determining the pressure drop of gas between two measuring points, containing two vessels, partially filled with liquid, placed one in another, with the inner vessel located above the free surface of the liquid of the outer vessel, the air cavities of both vessels are connected between the tube and the outer vessel it is provided with a connecting pipe with a single point of: measuring, and the internal one - with a hole in the bottom with a seat, on the axis of which a tube is installed, and at the end of the tube located below the bottom of the inner vessel, p The cavitator is placed and the other end of the tube is outside the external vessel and is connected to the second measuring point, while the internal vessel is connected to the external thermostat and pumping system, the internal vessel is equipped with maintain the level of the liquid, and the external vessel with a liquid-gas separation line positioning system 3. The device according to claim 2, dated from the fact that the cavitator is made movable. Sources of information taken into account during the examination: 1. Groshkovsky J. Technologists of High Vacuum, M., Publishing House of Istrapa Literature, 1957, Ch. Ill, § 1, p. 217. 2.Groshkovsky Ya. Technologists of high vacuum. M., Publishing House of Foreign Literature, 1957, Ch. P1, §2, p. 222 (prototype).