Abstract
The volute vacuum pumps provide an oil-free medium vacuum due to low backflows and the guaranteed clearance between the spirals. When developing volute pumps, the minimum radial clearance ensuring contactless movement of the spirals is determined for any normal operating conditions. The article considers a method for calculating the radial clearance of an oil-free volute pump. The gas forces acting on the working elements of the vacuum pump do not change significantly the radial clearance. Since the spirals are made of aluminum alloys, the main effect on the radial clearance change is caused by thermal deformations of the spiral elements. This change can reach up to 25%, and during pump operation the clearance decreases for external cavities and it increases for internal ones. To find the most accurate value of the radial clearance, it is necessary to use the results of measurements of the spiral element profile parts as an initial approximation. Comparison of calculated and experimental indicator diagrams confirmed the adequacy of the proposed methodology.
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