Rotary expansible chamber devices – Unlike helical surfaces on relatively wobbling rotating...
Patent
1985-05-14
1987-01-20
Vrablik, John J.
Rotary expansible chamber devices
Unlike helical surfaces on relatively wobbling rotating...
418181, 241185A, F04C 2107, F04C 1500, B02C 1806
Patent
active
046377859
DESCRIPTION:
BRIEF SUMMARY
During the decontamination of oil or chemical spillage, the cleaning of tanks, the transportation of waste water and on many other occasions of fluid matter handling problems are encountered in that the fluid to be pumped contains floating, solid objects of varying size, lumps of asphalt-like consistency, or that the fluid itself has been partly solidified due to the action of chemicals, and so forth.
The lack of suitable equipment for the handling of such fluids has proven to be a definite bottleneck during many decontamination operations. It is desirable to have at hand a compact, high-capacity pumping unit, which is not affected by contaminants or agglomerations in the fluid, i.e. the pump should itself have a capacity to fragmentate the floating member to a size suitable for passing through the pump.
A means according to the invention therefore includes a displacement pump enclosed in a housing and driven by a motor, and is characterized in a cutter device connected to the drive shaft of the motor, and arranged, when rotating concentrically therewith, to cooperate with at least one cutting edge located at the inlet to the pump housing.
The cutter device preferably includes a cylindrical drum structure, having a number of axially directed edge steels, the relationship between the rotational speed of the pump during cavitation-free flow and the peripheral distance between the edge steels at least corresponding to the size of the biggest, solid contaminant having a possibility to pass through the pump.
The pump is advantageously a screw pump, enclosed by a stator and connected to the pump shaft by way of an eccentrically movable link having two universal joints.
The pump ought to be of a reversible type, the edge steels having double-sided edges, and the opening having oppositely directed counter-edges.
The edge steels and the holders therefore are formed so as to provide a certain pumping activity within the cutter device.
The invention will below be described with reference to the accompanying drawings, in which
FIG. 1 shows a longitudinal section through a pumping means according to the invention, and
FIG. 2 shows a section along line II--II in FIG. 1.
The pumping means shown in the drawings comprises a displacement pump 10 of the screw type, for instance a so called "MONO"-pump, having a rotor 11 enclosed by a stator 12 of elastically deformable material. A pump of this type can handle fluids containing contaminants of a certain size.
The pump is driven by a motor 13, axially aligned with the pump rotor. Due to the oscillating movements of the pump rotor, the torque transfer path contains an eccentrically movable link 14 with two universal joints 15 and 16. A shaft portion 17, connected to the motor drives a cutter device 18, formed as a cylindrical drum 19 in which four axially directed edge steels 20 are mounted in holders 24, extending between a disc-shaped part 25 of the shaft, and a juxtaposed ring 26. The holder will, in use, rotate concentrically with respect to the motor axis.
The relationship between the rotational speed of the pump, during cavitation-free operation and the spacing between the holders 24 will at least correspond to the size of the biggest solid particles able to pass through the pump 10. No solid contaminant will thus, after the passage through the cutter device, cause any trouble in the pump. The inlet 21 to the pump is arranged in the wall of a cylindrical extension 22 of the pump housing 27.
Foreign objects in the fluid, which are bigger than what the pump can handle, will temporarily be caught in the inlet 21 to the pump, and will be macerated by the edge steels 20 in cooperation with counter-edge steels 23 along one side edge of the opening. Solidified fluids, or agglomerations therein will be ground or mashed by the cutter device, as the fluid passes into the housing 22.
One or more counter-steels may be fitted in the opening, and in a simple arrangement a border portion defining the opening may be sharpened to an edge.
The pumping means should be able to withstand chem
REFERENCES:
patent: Re29626 (1978-05-01), Allen
patent: 2516388 (1950-07-01), Humphreys
patent: 3224376 (1965-12-01), Schade
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