SEALED MULTISTAGE CENTRIFUGAL ELECTRIC PUMP Russian patent published in 2025 - IPC F04D13/06 

FIELD: space engineering.

SUBSTANCE: invention relates to space engineering and is intended for use in thermal control systems (TCS) of spacecraft with power consumption of 25-30 kW (or higher). Sealed multistage centrifugal electric pump, containing an electric motor, body elements, radial thrust bearing assemblies, which radial annular flat sliding surfaces are combined with the radial flat sliding surfaces formed on the input (first) and output (second) stages closed type centrifugal wheels driving disks radial outer surfaces, located on different sides along electric motor axis and facing suction parts from latter, wherein in front of the suction part of the inlet stage in the direction of the liquid there is a pre-auger, and the stages are linked to each other by means of channels in the housing of the stator of the electric motor, a guide vane of the outlet stage in the housing of the electric pump, wherein the inlet stage closed-type centrifugal wheel is made with unloading holes (for example, 8 holes with diameter of 1.5 mm, evenly spaced on the disk diameter of 11 mm) in the drive disk to reduce the axial force that arises during its operation to the minimum possible value, for example, up to 0.25 kgf, and geometrical parameters and number of grooves provided on output stage bearing sliding thrust surfaces, are made providing the same heat carrier flow rate through them in the direction to the input stage bearing axial cylindrical sliding surface, which flow rate is provided by the slotted channel between the axial cylindrical sliding surface with the input stage bearing grooves and the rotor shaft sliding surface, for example 0.3-0.5 cm³/s.

EFFECT: as a result, in the proposed EPU TCS of spacecraft, the elimination of boiling, then the collapse and condensation of the heat carrier in the EPU cavities is guaranteed, that is, thereby enabling the EPU structure significant reduction of vibrations and increase in the operation reliability over a long service life of the EPU, TCS and spacecraft as a whole.

2 cl