Fluid reaction surfaces (i.e. – impellers) – Specific working member mount – Interlocking blades
Reexamination Certificate
1999-06-09
2001-01-23
Look, Edward K. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Specific working member mount
Interlocking blades
C416S21200A, C416S21900R, C416S22000A, C416S21300R
Reexamination Certificate
active
06176680
ABSTRACT:
FIELD OF THE INVENTION
The invention concerns an impeller or a propeller for a rotary machine such as a liquid pump of centrifugal or axial type, a turbine or a propulsion unit.
An impeller of this type includes a hub attached to a rotary shaft and a number of vanes mounted on the hub or integrated with the latter.
In the specification below, the technique concerning axial or propeller pumps is dealt with. The invention is however applicable also for other types of impellers and propellers.
BACKGROUND OF THE INVENTION
An axial pump is characterized by the liquid being sucked into the impeller in axial direction and also leaving in axial direction. The kinetic energy obtained by the rotating impeller is transformed into pressure energy by help of a number of fixed vanes downstream of the impeller. Said vanes also normally serve as supporting elements in the pump housing.
The vanes mounted on the hub may have different designs depending on the type of liquid to be pumped, the head, etc. The angle between the hub and the vane is of great importance for the pump performance. In certain bigger machines such as turbines, it is common to make the vanes adjustable in order to obtain the best performance at different heads. This solution is of course very expensive and is also sensitive for pollutants.
By designing the hub with a spheric surface upon which the vanes are mounted, it is obtained that different vane angles may be chosen without the need to change the vane itself.
The purpose of the invention is to obtain an impeller which is easy an inexpensive to produce and possible to adapt for different types of liquids and operation conditions.
SUMMARY OF INVENTION
An impeller or a propeller for a rotary machine such as a liquid pump of centrifugal or axial type, a turbine or a propulsion unit, said impeller or propeller comprising a central part with a number of vanes attached to its periphery, the central part including a hub with a flange, an intermediate part and an end part, said intermediate part being put together by a number of identical hub sections each one provided with a vane, said sections having partitions therebetween, the partitions having substantially axially directed routes.
REFERENCES:
patent: 123274 (1872-01-01), McCay
patent: 335640 (1886-02-01), Simmons
patent: 1122925 (1914-12-01), Henrichsen
patent: 4930987 (1990-06-01), Stahl
patent: 5180286 (1993-01-01), Dean
patent: 5354177 (1994-10-01), Chang
Andersson Andreas
Ringblom Thomas
ITT Manufacturing Enterprises Inc.
Lombardi Menotti J.
Look Edward K.
Nguyen Ninh
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