SU721697A1 - Device for testing objects with internal pressure at elevated temperature - Google Patents

Description

I

This invention relates to a testing technique.

A known facility for testing objects with internal pressure, comprising devices for creating operating modes, sensors with recording devices, auxiliary equipment and communication lines 1.

Closest to the invention to the technical essence and the achieved result is a facility for testing objects with internal pressure at high temperatures, containing a tank for a high-temperature corrosive environment, means for creating operating modes in the test object, connecting pipelines, pressure sensors in the form of electrical contact gauges and temperature sensors 2 .

The disadvantage of these installations is the low reliability of operation when using electric contact gauges.

The purpose of the invention is to increase the reliability of the installation when using membrane-type pressure sensors.

This goal is achieved in that the installation is provided with an additional capacity for an inert medium communicated through one of the pipelines with the pressure sensors and cooling nozzles connected to the specified pipe connected to the temperature sensors, which are mounted on the pressure sensor housings.

The drawing shows the installation diagram.

The installation contains a tank 1 for a high-temperature corrosive environment, means for creating operating modes (not shown) in the test object 2, connecting pipes 3-7, temperature sensors (thermocouples) 8, 9, 10 and additional pipes 11 and 12. Temperature sensors are installed on the pressure sensor housings 13, 14 and 15, the pressure sensors are made in the form of spool type pneumatic repeaters, each of which contains a pressure sensing membrane 16, a stem 17, a spool. 18, a pneumatic supply pipe 19 and an outlet pipe 20, an electric sensor 21 and a pressure recorder 22 with a converter amplifier 23. A pneumatic feeding pipe 19 through a pipe 4 is connected to an electropneumatic regulator 24 installed at the outlet of the inert gas cylinder 25. The pressure sensors 5, nozzles 26, 27, 28 are installed on the body of the pressure sensors 13, 14, 15. The pressure sensor 13 outlet nozzle 20 communicates via a pipe 5 to an inert medium (for example, gas) filled with tank 29 equipped with a level gauge 30.

The installation works as follows.

The means of setting the operating conditions, affecting the test object 2, creates working pressure levels in it. The pressure measurement is performed by the electrical sensor 21 through pneumatic repeaters. The pneumatic rectifier at the inlet of the electrical sensor 21 repeats the measured pressures at its inlets so that the temperature and aggressive activity affect only the pressure sensing membrane 16, prevented by the electrical sensor 21.

The pressure of the measured medium acts on the perceptive pressure membrane 16, which through the rod 17 moves the spool 18. When moving (up) the spool 18, the opening in the nozzle 19 opens and the opening of the nozzle 20 overlaps. The movement of the spool 18 occurs until the pressure above the receiving pressure the membrane 16 is not balanced by the measured pressure under the membrane. The pressure above the diaphragm 16 is measured by the electric sensor 21. From the output of the electric sensor 21, the output signal is fed to the pressure recorder 22 and the amplifier-converter 23. The latter forms the control signal of the electropneumatically controlled

24. Inert gas in the cylinder

25, is supplied under pressure slightly exceeding the maximum pressure of each sensor currently measured, via line 4 through the pneumatic supply pipe 19 into the back pressure cavity of the pneumatic feeder. The pressure in the pipe 4 is controlled by the signals of the sensors 21 and the amplifier converter 23 by the electropneumatic control 24.

When moving upward, the spool 18 closes the opening of the outlet nozzle 20 connected via pipeline 5 with a tank 29 filled with an inert gas.

The electrical recording of the measured pressure is carried out by means of pneumatic repeaters, which exclude the influence of temperature and aggressive activity of the medium on the electrical sensor 21.

When the weakest parts of the stand-membrane 16 break through, the aggressive medium enters through the pipe 20 into the pipeline 5, cools and enters the container 29, where it is in a protective environment of inert gas. The level control of the corrosive medium of the tank 29 is performed by the level gauge 30. Subsequently, the corrosive medium heats the upper part of the pressure sensor housing. A signal from the thermal polar 8, 9 or 10 starts the nozzles, which intensively cool the pipeline 5. As a result of cooling, the aggressive medium condenses and freezes in the pipeline 5 and closes the pipeline 5, thus sealing the air volume and the pipelines of the installation. The aggressive medium does not have access to the pipe 4 through the pipe 19 due to the excess pressure of the pneumatic supply over the pressure of the measured corrosive medium. This ensures the reliability of the installation.

Claims (2)

Invention Formula An installation for testing objects with internal pressure at high temperatures, containing a tank for a high-temperature corrosive environment, means for creating operating modes in the test object, connecting pipes and pressure and temperature sensors, which in order to increase the reliability of the installation when using sensors pressure membrane type, it is equipped with an additional capacity for inert medium, communicated through one of the pipelines with pressure sensors, and cooling instructions ny conduit nozzles coupled with temperature sensors, which are installed on casings of pressure sensors. Sources of information taken into account in the examination 1. Skubachevsky L. With. Testing of air-jet engines. M., “Mechanical Engineering, 1972, p. 66 five 2. Ibid, p. 73 (prototype).