Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Radial flow devices
Patent
1990-11-01
1993-02-23
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Radial flow devices
415 90, 219 692, 29 2351, 2988923, F01D 514, B23H 730, B23P 1502
Patent
active
051885140
ABSTRACT:
A process for manufacturing impellers of turbine pumps provides for subjecting disks corresponding to the impeller to be obtained to electrical discharge machining, using tools in form of plates provided with radial slits extending along at least an arc of circumference and opening into hollow areas. A combined motion of rotation and translation is imparted to the disks, thus generating twisted blades having a profile with defined geometric characteristics. A one-piece rotor can be manufactured employing open tools with slits formed along a semicircumference, and two passages in succession of the workpiece through the tools, moving the workpiece with a combined motion of rotation and translation. An advantageous application of the articles manufactured by this process is for rotors of turbomolecular pumps, since the compression ratio and the pumping speed are optimized and a considerable structural sturdiness of the article is obtained.
REFERENCES:
patent: 2633776 (1953-04-01), Schenk
patent: 3288699 (1966-11-01), Trager et al.
patent: 3748055 (1973-07-01), Becker
patent: 3826588 (1974-07-01), Frank
patent: 5033936 (1991-07-01), Shinojima
Inserra Dario
Marzio Marco
Pellizzari Paolo
Berkowitz Edward H.
Larson James A.
Look Edward K.
Varian Associates Inc.
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