DEVICE FOR PROTECTION AGAINST CONTAMINATION OF OPTICAL SENSORS IN UNITS OF AIR-JET ENGINES

FIELD: physics.SUBSTANCE: invention relates to systems for protection against contamination by combustion products of input windows of optical sensors, which are installed, in particular, in units of turbine or combustion chambers of gas-turbine or other air-jet engines. Device for protection against contamination of optical sensors in units of air-jet engines comprises sensor housing having inlet and rear parts, inside housing is installed optical sensor with lens, which is arranged in inlet part of housing with annular gap relative to it, wherein rear part has compressed air supply pipe from compressor, and inlet part is conjugated with flow part of engine, between which between lens and inlet part there is gate, made with possibility of movement by means of piston pneumatic actuator. Device is equipped with an axially symmetric multi-start auger, the annular gap is made in the form of an annular supersonic nozzle, before the critical section of which on the side of the rear part of the sensor housing there is an axially symmetric multi-start auger. One cavity of the piston pneumatic actuator is pneumatically connected to the flow part of the engine, and the cavity formed by the lens and the shutter in the closed position is interconnected with the air ejection channels and with the other cavity of the piston pneumatic actuator. Piston-type pneumatic actuator is arranged in the cavity of the cooling air duct communicated with the air ejection channel.EFFECT: technical result achieved when implementing the proposed invention is an increase in the optical sensors protection efficiency during the engine operation, as well as during its start-up and shutdown.1 cl, 2 dwg Изобретение относится к системам защиты от загрязнения продуктами сгорания входных окон оптических датчиков, устанавливаемых, в частности, в узлах турбины или камер сгорания газотурбинных или иных воздушно-реактивных двигателей. Устройство защиты от загрязнения оптических датчиков в узлах воздушно-реактивных двигателей содержит корпус датчика, имеющий входную и тыльную части, внутри корпуса установлен оптический датчик с линзой, которая размещена во входной части корпуса с кольцевым зазором относительно него, при этом тыльная часть имеет патрубок подвода сжатого воздуха из компрессора, а входная часть сопряжена с проточной частью двигателя, при этом между линзой и входной частью размещена заслонка, выполненная с возможностью перемещения посредством поршневого пневматического исполнительного м