| 摘要 |
The invention relates to a delivery pump having a variable-speed drive for an adjustable metering delivery quantity, wherein the delivery pump is configured as a single-stage centrifugal pump having a radial wheel of centrifugal design which is arranged so as to rotate in a rotor space of a pump housing without a sealing gap, in order to convey a fluid between a pump inlet and a pump outlet. The radial wheel is connected to a drive motor, the speed of which can be varied as far as the five-figure range of revolutions per minute, flow is directed centrally at the radial wheel, said radial wheel is provided with delivery channels and has an external diameter of up to 50 mm, wherein, for use in a process-engineering system having continuous delivery quantities, the centrifugal pump is designed for part-load operation, the delivery quantities of which lie in the range from 0 ml/min to 3600 ml/min and in the case of delivery heights from 20 m to 300 m. An internal diameter of the rotor space is configured to be at most 4% higher than an external diameter of the radial wheel. A seal is arranged between the rotor space and the radial wheel and/or its shaft and the rotor space is provided on the circumference with one or more pump outlet channels which are arranged at an acute angle or tangentially with respect to the radial-wheel external diameter. |
