REVERSIBLE STEERING DEVICE OF HYDROJET ENGINE Russian patent published in 2008 - IPC B63H11/08 B63H11/10 

FIELD: engines and pumps.

SUBSTANCE: pivotal nozzle is made with two running channels located one above another, the said channels are formed with nozzle contour walls from exterior side and from interior side they are formed by walls of a fixed cone of a propeller hub and its guiding poles, the form of which is being transformed from one cross section to another along the nozzle axis into a predominantly horizontally elongated form of channels at the output cross section. Dimensions of channels of the said cross section are determined by the condition according to which the sum of areas of output cross sections of both channels must be less than the area of the open flow cross section of a circular channel of a water passage directly behind the propeller of the nozzle. There are cavities in the cone and poles of the propeller which are opened from the side of the output cross section of the nozzle. A reversible steering device is equipped with the second shutter of the working stroke, at that both shutters are assembled on horizontal axes located in the nozzle case and are able to rotate around axes to shut down the output cross sections of the open flow channels of the nozzle and to direct their output jets into the cavities of the propeller cone and its poles; they are complemented with at least one channel of a reverse movement designed to alter a direction of surge of nozzle jets while reversing and located along side poles of the reversible nozzle. Input zones of the said channels are communicated with the cavities of the propeller and poles through apertures, formed in the exterior side walls of the nozzle, while their output zones communicate with environment and are oriented predominantly against an outer flow.

EFFECT: downsizing of a device while maintaining its hydrodynamic characteristics.

5 cl, 4 dwg