Pumps – Motor driven – Pump within rotary working member
Patent
1972-12-20
1976-02-17
Husar, C. J.
Pumps
Motor driven
Pump within rotary working member
F04B 1700
Patent
active
039389138
ABSTRACT:
A flow machine for pumping and/or measuring the flow of agressive, radioactive, or special-purity flow mediums. The flow machine is provided with a rotatable impeller magnetically supported within a machine casing such that the impeller is spaced at all points from the inside walls of the machine casing. The casing inside walls and the outer configuration of the impeller include a central cylindrical center section joined by conically outwardly flared end sections. Electromagnetics are arranged in the conical flared section outside of the inside wall for cooperation with magnetic material arranged in the corresponding conically flared sections of the impeller to support the impeller in position. The conically flared section facilitate both radial and axial support of the impeller, since both axial and radial components of electromagnetic force is experienced at the conically flared sections of the impeller. Means are provided to detect the gaps around the circumference of the impeller between the impeller and the casing inside walls, which means provide signals to an electronic device for controlling the respective current supply to the electromagnets so as to assure the maintenance of a substantially uniform circumferential gap around the impeller for all operating conditions. In one embodiment, the flow machine is constructed as an axial flow pump driven by an asynchronous electric motor having a rotor formed around the cylindrical section of the impeller and a stator arranged outside of the inside walls along the cylindrical section thereof. A further embodiment of the flow machine is constructed as a flow meter which includes means for detecting the rotational speed of the impeller, which rotational speed is a direct function of the volumetric flow and/or velocity of the flow medium through the impeller.
REFERENCES:
patent: 3143972 (1964-08-01), Smith et al.
patent: 3218981 (1965-11-01), Kierulf
patent: 3273506 (1966-09-01), Jamieson
patent: 3433163 (1969-03-01), Sheets et al.
Bloch Peter
Isenberg Gerhard
Tuzinsky Wolfgang
Husar C. J.
Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft
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