Fluid reaction surfaces (i.e. – impellers) – Support mounting – carrier or fairing structure
Reexamination Certificate
2000-01-27
2001-10-23
Look, Edward K. (Department: 3629)
Fluid reaction surfaces (i.e., impellers)
Support mounting, carrier or fairing structure
C416S20400A, C403S371000
Reexamination Certificate
active
06305906
ABSTRACT:
The invention concerns a device for attaching a detail onto a rotary shaft, namely a pump impeller onto a driving shaft with the possibility to slide the impeller along the shaft in order to obtain a suitable location relative a surrounding pump housing.
In a pump having a rotary pump impeller, such as a centrifugal—or an axial pump, the impeller must be attached rigidly and non-rotary to the driving shaft in a suitable way. A commonly used fixing means is a wedge joint which consists of a wedge which is brought into opposite grooves in the shaft and in the impeller respectively. Such a joint is often very suitable, but it lacks certain qualities which sometimes is a disadvantage. For instance it is often difficult to loosen the impeller from the shaft and replace it and It could also be difficult to adjust its axial position on the shaft.
In the following the technical field submersible pumps is dealt with, especially centrifugal pumps for pumping of heavily polluted liquids, and the specific problems which often occur here.
A submersible centrifugal pump comprises a driving unit such as an electric motor and a hydraulic unit including a pump housing with a rotary pump impeller connected to the electric motor via a driving shaft. A seal device is arranged in-between the motor and the pump housing to prevent liquid from penetrating the motor.
The location of the surrounding pump housing relative to the pump impeller is of course of great importance for obtaining a good pump result. This is valid for the axial as well as the radial location. When pumping liquids containing strongly abrasive particles, the impeller as well as other elements will be worn meaning that the initially correctly measured slots need to be adjusted at even intervals. As the pump impeller is rigidly attached to the shaft, an axial adjustment can only be obtained by help of an adjustable pump housing. In order to adjust the slot between the leading edge of the impeller and the bottom of the pump housing, the latter must be adapted to be possible to move in axial direction. In this way the radial slot can be controlled in relation to the wear of he surfaces. This adjustment, which is obtained by help of a number of axially directed screws, is however sometimes not exact enough and it has therefore been a wish to make an axial adjustment of the impeller possible.
REFERENCES:
patent: 3904301 (1975-09-01), Scroeder
patent: 5630704 (1997-05-01), Gilgenbach et al.
patent: 5961247 (1999-10-01), Gold et al.
patent: 5984632 (1999-11-01), Lee et al.
ITT Manufacturing Enterprises Inc.
Lombardi Menotti J.
Look Edward K.
Woo Richard
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