Pump and fuel cell system having a pump

摘要

A pump has a shaft, an impeller arranged on the shaft, and a labyrinth seal which is arranged between stationary and moving parts of the pump. A plurality of blades are arranged on the rotor and a labyrinth seal extends at least between the shaft and a rear portion of the blades. A gap in the labyrinth seal is designed such that liquid water can be actively carried away, with the labyrinth seal for this purpose being designed at least in places with a channel in the form of a spiral and/or a staircase. The invention also relates to a fuel cell system having such a pump.

主权项

1. A pump comprising:
a shaft; an impeller arranged on the shaft; and a labyrinth seal arranged between stationary and moving parts of the pump; wherein, a plurality of blades are arranged on the impeller; the labyrinth seal extends at least between the shaft and a rear portion of the blades; the labyrinth seal has at least one channel which extends in a helical shape; and at least portions of a surface of the impeller which faces the labyrinth seal is structured with a roughness which is greater than that on a further surface of the impeller.