SU546018A1 - Device for calibrating integrity sensors - Google Patents

Description

one

The invention relates to a bench measurement technique and can be applied for the calibration of continuity sensors used in testing consumable lines of propulsion systems.

A device is known which is a closed pipeline, inside which a turbine is installed, driven by an engine with an adjustable speed. A continuity sensor is included in the pipeline rupture. The volume of the pipeline cavity is predetermined with high accuracy. A predetermined volume of liquid is poured into it, which is necessary to form a mixture with a given continuity. At the turbine heading, a two-phase flow of 1 j is generated in the pipeline.

The disadvantages of the known device are the complexity of the design (the presence of the engine and the turbine, the shaft sealing the rotating turbine), the complexity, and the time spent on calibration (the turbine must move the liquid and gas until a uniform mixture is obtained).

2

The circuit of the invention is to simplify the design of the device and reduce the graduation time.

This is achieved by the fact that in the device for calibration of sensors of continuity, containing a container filled with working fluid and gas, and graduated flatness sensors mounted on it, the container is made in the form of a sealed straight line section of the pipeline with two diffusers inside it, one of which is installed on the end side between one of the calibrated sensors and the liquid-gas boundary, and the other on the side of the other end on a distance equal to the distance from the first sensor to the first diffusor. In addition, the diffusers are made in the form of a disk with holes. The drawing schematically shows a device for the calibration of continuity sensors, a slit.

The device consists of a straight-line vertically installed section of pipeline 1, in the middle part of which there are installed graduated continuity sensors 2 at a distance L (2 from one another.

From the lower and upper ends, the pipeline is hermetically sealed with covers 3, one of them has an opening for pouring fluid with a plug 4. The pipeline is partially filled with fluid 5, on which graduation of the sensors is performed. The remaining pipeline volume is filled with gas 6.

A diffuser 7 in the form of a disk with openings of a given size is installed between the upper sensor and the liquid-gas interface. On the opposite section of the pipeline, a second diffuser is installed symmetrically with respect to the calibrated sensors. The sensors with the pipeline are fixed in support 8, which allows fast transfer of the pipeline from one end to another.

After turning the pipeline, the gas from the bottom of the pipeline rushes up through the holes in the diffuser, and 20 the liquid under the force of gravity fills the bottom. As a result, a two-phase flow passes through the sensor cross section: the liquid flows downwards, the gas flows upwards. The diffuser serves to form gas bubbles of a certain size and to obtain a two-phase flow that is uniform in time.

If you know exactly the volume of gas Wp in the pipeline and the time t during which the two-phase flow through the sensor moves (using the oscillogram of output signals of the density sensors), you can determine the average flow rate of gas (and liquid) through the sensor:

Qp, 35

The velocity of the gas Vp through the sensors is determined by the known distance between the calibrated sensors and the time tg between the instants of the output 40 of the sensors (according to the oscillogram of the output signals):

L ,, / t,

H

The area occupied by the gas in the cross section of the pipeline is determined by:

S.

Q./v,

The impassability of a two-phase flow is determined by:

yuoi

H-SP / S,

where: S is the cross-sectional area of the sensor.

After the process is completed, the calibration can be repeated by turning the pipeline to its original position (for this purpose, the device contains two diffusers installed symmetrically with respect to the calibrated sensors).

Claims (2)

1. A device for calibration of sensors of continuity, containing a container filled with working fluid and gas, and calibrated density sensors attached to it, characterized in that, in order to simplify the design of the device and reduce the calibration time, the tank is filled in the form of a sealed rectilinear segment of the pipeline with two diffusers placed inside it, one of which is installed on the end side between one of the calibrated sensors and the liquid-gas boundary, and the other on the side of the other end on the distance equal to the distance from the first sensor to the first diffuser. 2. The device according to claim 1, characterized by the fact that the diffusers are made in the form of a disk with openings. Sources of information taken into account in the examination: 1. The use of electrical capacitor sensors to monitor the continuity of the flow of liquid sb. Testing and measuring equipment, Lviv, 1969, vol. 7  1 l ff S ii 111 -7 eight