ELECTROTHERMAL MICROMOTOR Russian patent published in 2017 - IPC F02K9/68 

FIELD: engines and pumps.

SUBSTANCE: electrothermal micromotor comprises an outer and an inner cylindrical bodies, arranged coaxially with the formation of toroidal cavity between their walls, a swirler of inlet fuel, a pipeline for fuel supply into the swirler, a gas duct with a jet nozzle, a cylindrical heating element and a tubular thermocouple located at the inlet of the jet nozzle, current leads of the heating element and thermocouples brought out through the end face of the inner housing by means of a sealing heat-resistant sealant. At one end the outer and inner bodies are hermetically connected to each other by means of flanges, and at the other end on the side surface of the outer body, there is a pipeline for feeding fuel into the toroidal cavity, inside which there is a swirler of the inlet fuel flow in the form of a screw channel, in the form of a two-start thread on the external surface of the internal body, the outer surface of which is in contact with the inner surface of the outer body which outlet is connected to the cavity of the inner body at the inlet of the gas duct in the form of the screw channel, formed by the outer surface of the cylindrical heating element, the tubular body of the thermocouple, placed along the helical line on surface of the heating element and contacting with internal surface of the internal body. Jet nozzle is mounted on end of the inner body and is provided with an outer flange hermetically connected with the flange of outer body. The thermocouple sensitive element is located near the inlet to the nozzle critical section, and on the side opposite to the nozzle, the length of the outer body exceeds the length of the inner body, on which the shoulder contacting the inner surface of the outer body is made, the sealing heat-resistant sealant is placed in the cavity of the outlet of the current leads of the thermocouple and the heating element, which is formed by the free inner surface of the outer body and a stop washer fitted on the cylindrical heating element.

EFFECT: increased tightness degree, reduction of weight and increase of specific impulse of the micromotor thrust.

3 dwg