| 摘要 |
FIELD: engines and pumps.SUBSTANCE: turbo-pump unit includes a turbine assembly comprising a steam inlet housing, a nozzle block with inclined convergent-divergent nozzles, a turbine having a shaft with a runner, and a waste steam outlet housing located downstream of the turbine. The steam inlet housing is equipped with a supply connection pipe and a header including an axisymmetrical annular cover, the larger part of which has the shape of a tore or toroid fragment. The header is attached to the nozzle block disc. The nozzles of the block are made in the disc in the amount of 8÷15, are located radially at equal distance with their longitudinal axes from the turbine axis and equally spaced in a circumferential direction at equal angles determined in the range of (24÷45)°. Longitudinal axis of each nozzle is located in a conditional plane parallel to the turbine shaft axis normally to the turbine shaft axis, normally to radius and inclined in the above plane at an angle to the conditional plane of the disc in the direction opposite to rotation vector of the turbine runner at an angle of (12÷25)°. The pump assembly of the unit includes a pump housing with a screw centrifugal impeller.EFFECT: increasing service life, improving compactness, efficiency and reliability of the unit and medium pumping effectiveness at simultaneous reduction of material consumption.19 cl, 6 dwg |
