METHOD AND DEVICE FOR CONTROL OF THE SEALING OF BOTTOMS OF FUEL TANKS OF LIQUID ROCKETS Russian patent published in 2018 - IPC G01M3/20 

FIELD: test equipment.

SUBSTANCE: invention relates to the field of leak testing and can be used to control the tightness of the bottoms of fuel tanks of liquid rockets. Essence: product (2) is placed in test vacuum chamber consisting of mounting table (1) and vacuum hood (3). Cap (4) is sealed with upper nozzle of product (2). With the help of vacuum evacuation system (6), atmospheric air is evacuated from test vacuum chamber volume. By means of system (5) for supplying control gas to product, product (2) is filled with helium or mixture of helium and air. Leakage of helium into volume of test vacuum chamber is recorded with mass spectrometric leak detector (7). If the measured flow of test gas exceeds the allowable value, an area of penetrating microleakage is being searched. For this purpose, two local chambers (9, 10) are used covering symmetric with respect to axis line of product (2) sectors of its surface. Local chambers (9, 10) are configured to move stepwise along surface of product (2) creating hermetic connection to product’s surface (2) after each step. After each movement of local chambers (9, 10) and after sealing at surface of product (2), volumes of local chambers (9, 10) by flexible vacuum lines (12, 13) are connected to mass spectrometric leak detector system (7). Sealing of part of product’s surface (2) covered by local chambers (9, 10) is monitored. In this case, for local inspection of entire surface of product (2), operation is repeated as many times as necessary, and in order to more accurately locate defect of impermeability on surface of product (2) covered by local chamber, an operation is performed to control concentration of accumulated helium in local fractions of its volume.

EFFECT: technical result: increase in control sensitivity, reduction of labor and time expenditure, increase in test productivity.

2 cl, 1 dwg