Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Vane or deflector
Patent
1998-12-03
2000-12-26
Lopez, F. Daniel
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Vane or deflector
4151701, 4151731, 4151733, 4151736, 4152111, 416189, 416192, 416193R, 165 41, 165140, F04D 2944
Patent
active
061649090
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a radial fan, especially as a fan for the cooling unit of a vehicle, comprising an impeller with radial blades, a cover disc formed like a nozzle, an air guide ring fastened to it, an impeller bottom, as well as a stationary inlet nozzle.
SUMMARY OF THE INVENTION
Radial fans provided with these features are known from DE 44 31 839 A1 and DE 44 31 840 A1. In radial impellers made of plastic, moldability of the curved cover disc inlet from the injection molding die is difficult or impossible. The curvature of the covered disc inlet on the also-curved inlet nozzle, however, is essential to reduce the gap losses that arise from separation of the airflow. It is therefore proposed in these two documents to produce separate air guide rings, which are fastened adjacent to the cover disc. These air guide rings, however, are necessary solely for manufacturing reasons, as explained above. In order to reduce power losses occurring from the air gap between the stationary inlet nozzle and the rotating impeller, blade continuations are provided, in one case, on the cover disc of the impeller, and individual auxiliary blades on the cover disc input are arranged in the other case. These parts can lead to an improvement of efficiency. If options that are favorable from the standpoint of energy economy are chosen to drive the radial fan (directly from the engine of the vehicle), problems occur, consisting of the fact that the engine and thus the impeller and the other rotating parts attached to it execute movements in the axial and radial direction relative to the stationary inlet nozzle, which can be greater than 10 mm. The air gap must therefore be chosen large enough, so that these tolerances can be compensated and contact between the parts is reliably prevented. This again adversely affects the efficiency of the fan, because the power losses caused by the unduly large gap are enormous. The aforementioned auxiliary blades and blade continuations cannot offer an adequate remedy here, because with greater spacing or gap the spacing between the auxiliary blades also becomes greater, which significantly reduces their effect. Elastic covers are a remedy here, which can reduce the losses from the larger air gap, but these losses nevertheless remain enormously large.
PRESENTATION OF THE INVENTION
The task of the invention is to propose a radial fan, especially as a fan for the cooling unit of a vehicle, which permits significantly larger tolerances between the rotating impeller and stationary inlet nozzle, without causing a significant deterioration in the efficiency of the fan.
The solution according to the invention proposes that the air gap that produces gap flow be designed between the cover disc and a corotating air guide ring. The air gap should be dimensioned uniformly over its entire periphery. The air guide ring of a first embodiment has a lower partially circular section facing the cover disc when viewed in cross section, and a roughly vertical section positioned between the cover disc and the stationary inlet nozzle. The air guide ring of a second embodiment additionally has a roughly horizontal section facing the inlet nozzle, and connected on top to the vertical section.
The horizontal section of the air guide ring and the entire air guide ring have significant spacing from the stationary inlet nozzle, so that the tolerance compensation between the rotating and fixed parts of the radial fan is possible without a significant deterioration in efficiency of the fan. This gap or spacing of the air guide ring from the inlet nozzle is provided with appropriate covers The different embodiments of the cover are guided according to which embodiment of the air guide ring is chosen. In the embodiment of the air guide ring without the upper horizontal section, elastic elements, for example, brushes, rubber elements or the like, are arranged either on the inflow nozzle or on the vertical section of the air guide ring. The other embodiment has a circular part arranged around th
REFERENCES:
patent: 3642062 (1972-02-01), Edmaier et al.
patent: 4398508 (1983-08-01), Moon et al.
patent: 4432694 (1984-02-01), Kuroda et al.
Ehlers Michael
Stephan Bernhard
Lopez F. Daniel
McAleenan James M.
Modine Manufacturing Company
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