SU800764A1 - Stand for aerohydrodynamic testing - Google Patents

Description

(54) STAND FOR AIR GAS DYNAMIC TESTS

one

This invention relates to aerogas dynamic tests using turbo-gas and exhaust aggregates.

A stand for aerogasdynamic tests is known, containing a series-connected aerogasdynamic installation, a vacuum main, a turboexhauster assembly and a pressure main, as well as a choke, Q 1e of the full gas line, connected to a source of compressed gas, a gas pressure regulating system. In the vacuum main with its element The control and target signal comparisons associated with the bypass throttle 15 are installed between the pressure and vacuum lines l.

The disadvantage of the test bench is the lack of protection against pressure drops at the inlet of the turboexhauster unit. 20

The purpose of the invention is protection against pressure drops at the inlet of a turbo-expander unit having a drive equipped with a shutdown unit. This goal is achieved by the fact that the stand additionally contains a power limiting system and an emergency stop system with its own gas pressure sensors at the inlet of the turboexhaust unit, the first threshold

A second unit with a sensor and a setpoint device for maintaining gas pressure in the vacuum line, a second threshold unit with a setting unit and a sensor for the rate of change of gas pressure at the inlet of the turbo-gas-agglomerator, a control unit and a shut-off and regulator installed at the inlet of the turbo-gas-agglomerate unit gas in the vacuum line is connected to the output of the control and setpoint comparison element, and the outputs of both threshold units are connected to the inputs of the control unit, the output to orogo connected to the input of the emergency stop system, the outputs of which are connected to the input power limiting system and to block entry turboeksgausternogo disconnecting the drive unit.

The drawing shows a block diagram of the stand.

Claims (1)

The stand for aerogasdynamic tests contains aerogasdynamic unit 1, vacuum line 2, turboexhaust unit 3 with drive 4 and shutdown unit 5 and main pipe 6, line filling throttle 7, source 8 of compressed gas, gas pressure control system 9 in the vacuum line, control element 10 and a predetermined signal, the bypass choke 11, the power limiting system 12 and the emergency alarm system 13 with their sensors 14 and 15. gas pressure, the first threshold unit 16 with the sensor 17 and the target Error 18 maintains the pressure of the gas, the second threshold unit 19 with the setting device 20 and the sensor 21 of the rate of change of the gas pressure, the control unit 22 and the locking-regulating body 23. The stand operates as follows. After filling with gas from the source 8 through the throttle 7 of the aerogasdynamic unit 1, the vacuum line 2 and the pressure line b with the bypass throttle 11, the operating mode is maintained by the control system 9 and the power limiting system 12 acting on the shut-off and control organ 23 by signals pressure sensor 14. The emergency shutdown system 13 only works when the pressure limit at the inlet of the turbo-gas and gas aggregate 3 is reached, according to pressure sensor 1b signals to the power limiting system 12 and drive 4 disconnecting unit 5. When off-design emergency disturbances occur with a high pressure build-up rate at the outlet of the comparison element 10, a pressure control error arises, which is fed to the sensor 17 and compared with the setpoint 18 signal. signal is fed to the input of the unit 22. control. Simultaneously, a signal proportional to the rate of change of pressure is received from the sensor 21 to the input of the second threshold unit 19, which is compared with the setpoint signal 20, and if the difference between the signals exceeds a predetermined value from the output of the second threshold unit 19, a control signal is supplied to the second input of the control unit 22. If there are signals from both threshold units at the inputs, the control unit 22 supplies a signal to the input of the emergency stop system 13, which turns off the turboexhaust unit. Thus, the introduction into the stand of the systems for limiting power and avia stop, the control unit of two threshold blocks with sensors controlling the slew rate of the pump and the error of maintaining the pressure, has a positive effect in protecting the turbo-electrical aggregate against pressure drops at the inlet. Claims for aerogasdynamic tests stand containing sequentially connected aerogasdynamic plant, vacuum line, turboexhauster unit and pressure line, as well as a line throttle connected to a source of compressed gas, a gas pressure control system in a vacuum line with its control element and a generator. associated with a bypass choke installed between the pressure and vacuum lines, characterized in that, in order to protect the t pressure drops at the inlet of a turbo-exhauster unit having a drive equipped with a shutdown unit; the stand additionally contains a power limiting system and an emergency shutdown system with its own gas pressure sensors at the inlet of the turboexaguster unit; threshold unit with a setting device and a sensor for the rate of change of gas pressure at the inlet of a turboexhauster unit: a control unit and a regulating valve installed at the input of the turbo-expander unit, the sensor input of the pressure maintenance error of the gas in the vacuum line is connected to the output of the control and preset signal comparison element, and the outputs of both threshold units are connected to the inputs of the control unit whose output is connected to the input of the emergency stop system, the outputs of which connected to the input of the power limiting system and to the input of the drive shutdown unit of the turboexhauster unit. Sources of information taken into account during the experiment 1. USSR author's certificate No. 586428, cl. G05 TE 16/00, 1977.