Pumps – One fluid pumped by contact or entrainment with another – Contact or entrainment within rotary impeller
Patent
1999-06-21
2000-07-04
Freay, Charles G.
Pumps
One fluid pumped by contact or entrainment with another
Contact or entrainment within rotary impeller
417430, F04C 1900
Patent
active
060829737
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a rotor for a liquid ring machine.
BACKGROUND INFORMATION
A liquid ring machine is described in German Patent Application No. 195 169 94. In operating this machine with hard, i.e., limestone-containing, water, for example, limestone deposits are formed in the inner housing. In this case, the thickness of the limestone deposit increases depending on the temperature. A particularly critical stage is reached when, for example, the axial clearances between the rotor and the inner housing are filled with limestone. In operating the machine, in particular, in the case of longer shutdowns, the rotor may become jammed due to this limestone deposit or it may be axially displaced by hitting the limestone layer. This displacement of the rotor may also result in the rotor being eroded on the opposite side by the housing. Material failure or motor damage may result. The same may occur in the event of thickening corrosion layers.
So far, there have been no specific and effective measures against these phenomena for liquid ring machines. Chemical additives in the water or ionic accelerators may reduce limestone levels in this special case by chemically binding the limestone contained in the water or reducing calcium ions in the water added. In addition to being ecologically questionable, the cost of these measures is very high and they are also ill-suited to combat corrosion problems, for example.
SUMMARY
An object of the present invention is to reduce this layer growth on the inside of the housing of a liquid ring machine.
This object is achieved according to the present invention by providing at least one recess on the rotor hub face and/or on the support disk back side. The growing layers are scraped off due to the arrangements of recesses that form edges on the support disk back side and/or on the rotor hub face, and are transported outward with the operating liquid or discharged through the support disk slot. Thus the axial clearances cannot be completely filled with limestone to the point where the rotor is jammed or axially displaced. The total width of the recesses for forming edges is conveniently selected to be no larger than 2% of the rotor perimeter. Combinations of different recesses resulting in edges are possible. Thus, pocket holes can be combined with grooves and/or slots, as well as grooves with through holes. A substantially radial orientation of the recess for forming edges enlarges the surface to be swept. In order to obtain good clearance sealing even in high vacuum, the sealing surfaces of the support disk back side and the rotor hub face must have no radial holes.
Additional embodiments are described in the claims. With such modifications of the liquid ring machine, laboratory tests showed no negative effect on the pump characteristic, power consumption or noise generation of the liquid ring machine. In the following, the present invention is explained in detail with reference to an embodiment illustrated in the drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows grooves in the face of a rotor hub according to an example embodiment of the present invention.
FIG. 2 shows a radial groove and a radial slot in the support disk back side.
FIG. 3 shows offset grooves in the rotor hub face of a liquid ring machine for high vacuum.
FIG. 4 shows a perspective view of the rotor (rotor hub front face in the foreground).
FIG. 5 shows a perspective view of the rotor (support disk back side in the foreground).
DETAILED DESCRIPTION
FIG. 1 shows a section through rotor 1 having grooves 3 on the face of rotor hub 2, which is designed as a sealing surface 7. FIG. 2 shows a longitudinal section through rotor 1, which has recesses 8 with formed edges on support disk back side 4; the recesses are in the form of slot 6 and groove 3 in this case. FIG. 3 shows a cross section through rotor l, which has grooves 3 offset by 180.degree. on rotor hub face 2; these grooves, however, do not fully pass through sealing surface 7 of rotor hub 1. FIGS. 4 and
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Dittmar Rudi
Schmid Norbert
Evora Robert Z.
Freay Charles G.
Siemens Aktiengesellschaft
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