Patent ID: 8734129

Claim:
Motor pump unit for a high-pressure cleaning apparatus, comprising: a liquid-cooled electric motor and a pump, wherein: the electric motor has a motor housing that is surrounded by a cylindrical shell shaped cooling housing with an annular space having an annular space inlet and an annular space outlet formed therebetween, the pump has a suction inlet connected to the annular space outlet for drawing in liquid and a pressure outlet for discharging the liquid, the liquid to be transported by the pump is suppliable to the annular space inlet, the cooling housing, on its inside, comprises at least one flow guide rib for guiding the liquid within the annular space, the at least one flow guide rib is spaced-apart from the motor housing, and a gap exists between the at least one flow guide rib and the motor housing along a total longitudinal length of the at least one flow guide rib.