PUMP ASSEMBLY FOR TRANSFERRING PROCESS FLUID Russian patent published in 2020 - IPC F04D13/06 F04D29/10 F04D29/58 F04D7/06 

FIELD: engines and pumps.

SUBSTANCE: invention relates to pump drive assembly for transfer of process fluid. Assembly comprises common housing (4) surrounding pump (2). Pump comprises impeller 21 and pump drive 3. Drive 3 comprises shaft 5 for impeller 21 and limiter 13 running around shaft 5 and arranged between impeller 21 and drive 3. Housing (4) comprises inlet (22) and outlet (23) of pump (2) for process fluid medium. There is also inlet (43) for the gate fluid medium, through which the latter can be introduced into drive (3), and outlet (44), through which the breech fluid medium can be released from housing (4). Outlet (44) and inlet (43) are in fluid communication with each other through line (91), so that cooling circuit for gate fluid medium with heat exchanger (9) is formed. On shaft (5) in area between limiter (13) and drive (3) there are multiple chambers (11) of storage for gate fluid medium. Chambers (11) are located one after another relative to axial direction (A), at that corresponding two adjacent chambers (11) are connected by fluid medium to each other. Chambers (11) have total volume, which is at least as large as the thermally induced change in the volume of the gate fluid medium in the cooling circuit while reducing the temperature of the gate fluid medium to a predetermined value.

EFFECT: invention is aimed at exclusion of drive damage by process medium.

14 cl, 5 dwg