RU94029168A - Method of detection of leak in technological main line which is part of sealed compartment - Google Patents

Abstract

FIELD: testing equipment. SUBSTANCE: vacuum chamber is connected to aids recording testing gas (helium mixture), for instance, to helium leak detector. Sealed compartment of flying vehicle is placed into vacuum chamber. Technological main lines of vacuum chamber are joined to filling unions (valves) of sealed compartment and chamber is pumped out. When necessary pressure in vacuum chamber is achieved gas is forced from technological main line into sealed compartment by its blow-through with testing gas with chosen permanent flow rate in the course of specified time. In process of blow-through abrupt increase of concentration of testing gas in vacuum chamber is registered. Immediately after completion of blow-through testing gas is forced from technological main line by pumping of gas from sealed compartment through it with maximum flow rate in the course of specified time. Sudden decrease of concentration of testing gas in vacuum chamber is registered during this process. Stated sequence of actions and registration of peak-like changes of concentrations of testing gas in vacuum chamber allow conclusively assert that technological main line which is part of sealed compartment leaks. Registration of smooth changes of concentrations of testing gas enables to make suggestion on points of most probable location of local leaks in sealed compartment. EFFECT: reduced time of test of leak-proofness of sealed compartment of flying vehicle due to earlier location of leak in technological main line. 1 cl, 3 dwg

Claims (1)

The invention relates to test equipment and allows to reduce the time of monitoring the tightness of the pressurized compartment of the aircraft (LA) due to earlier detection of leaks in the process line and reduce the time it takes to find a place for increased tightness of the pressurized compartment. The pressurized compartment of the aircraft is placed in the vacuum chamber connected to the means for recording the control gas (helium mixture), for example, with a helium leak detector, the technological lines of the vacuum chamber are connected to the filling lines (valve) of the pressurized chamber and the vacuum chamber is evacuated. After reaching the required pressure in the vacuum chamber, the gas is forced out of the process compartment into the pressurized compartment by purging it with control gas at a selected constant flow rate for a predetermined time. During the purging process, a sharp increase in the concentration of the control gas in the vacuum chamber is recorded. Immediately after the purge is completed, the control gas is displaced from the process line by bleeding (evacuating) the pressurized gas through it with a maximum flow rate for a predetermined time. In the process of bleeding, a sharp decrease in the concentration of the control gas in the vacuum chamber is recorded. The indicated sequence of actions and the registration of a peak-like change in the concentration of the control gas in the vacuum chamber allows us to unequivocally confirm the leakage of the process line as part of the pressurized compartment of the aircraft. Registration of smooth changes in the control gas allows us to make an assumption about the places of the most probable location of local leaks in the pressurized compartment.