Pumps – One fluid pumped by contact or entrainment with another – Contact or entrainment within rotary impeller
Reexamination Certificate
1999-12-29
2001-09-11
Walberg, Teresa (Department: 3742)
Pumps
One fluid pumped by contact or entrainment with another
Contact or entrainment within rotary impeller
Reexamination Certificate
active
06287082
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a liquid ring pump, comprising at least one drive unit, having a drive shaft, and at least one working space housing with an impeller rotating in it and located on the drive shaft, and at least one disk cam with passages for the exchange of operating fluid and for venting, as well as suction and pressure openings.
BACKGROUND INFORMATION
Liquid ring pumps are described in European Patent Nos. 0 517 277 and 0 645 521. Each liquid ring pump includes an overhanging impeller, with which the gap adjustment and axial fastening are performed by means of a screw. These adjustments prove to be very laborious and complicated during installation and repair work and, what is more, a special tool is required for this.
SUMMARY OF THE INVENTION
An object of the present invention is to simplify the operation of axial gap adjustment during both installation and repairs.
The object is successfully achieved by providing an impeller which is axially freely movable on the drive shaft and within the working space housing, even during operation, and by providing a disk cam having in the region of the front face of the drive shaft a passage for the exchange of operating fluid. During operation of the pump, the axial gap between the disk cam and the impeller, as well as between the impeller and the rear side of the pump, sets itself of its own accord on account of the hydraulic conditions. These hydraulic pressure conditions are established as soon as the exchange of operating fluid takes place via the passages in the disk cam in the form of bore holes or annular cutouts opposite the front side of the drive shaft.
REFERENCES:
patent: 4443158 (1984-04-01), Bentele et al.
patent: 5100300 (1992-03-01), Haavik
patent: 5197863 (1993-03-01), Dardis
patent: 5211543 (1993-05-01), Siebenwurst
patent: 316 044 (1919-11-01), None
patent: 41 23 938 (1993-01-01), None
patent: 0 517 277 (1992-12-01), None
patent: 0 645 521 (1995-03-01), None
patent: 2 146 786 (1973-03-01), None
BakerBotts LLP
Patel Vinod D
Siemens Aktiengesellschaft
Walberg Teresa
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