Rotary kinetic fluid motors or pumps – Plural runners supported for relative motion or on separate... – Diverse type runners – blade systems or working fluid paths...
Patent
1987-10-08
1988-12-27
Garrett, Robert E.
Rotary kinetic fluid motors or pumps
Plural runners supported for relative motion or on separate...
Diverse type runners, blade systems or working fluid paths...
415 72, 415143, 366266, 366294, 366295, F04D 302
Patent
active
047937670
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for pumping highly-viscous material, in particular thick oil, said device being adapted to at least partial immersion in the material and comprising a rotary helical screw, and a shell surrounding said screw and being partially open to permit entry of the material, said shell being adapted to rotate in an opposite direction with respect to the screw and being provided with means for promoting feed of material towards the screw.
Screw conveyors are very well known and are employed for the transport of both fluid liquids and granular material. A conveyor of the type defined above, and particularly designed for conveying granulate material is disclosed in the SE-patent No. 322,161. In connection with e.g. escapes of oil, however, it has been observed that the handling of the oil after it has been collected into a tank requires a disproportionate expenditure of time and energy and that neither conventional liquid pumps nor screw conveyors function in a satisfactory manner in this application. In the case of conventional screw conveyors the cause is principally the fact that the flow of thick oil at low temperature is so poor that the screw very soon forms a cavity in the mass of oil within which cavity the screw rotates without raising any appreciable amount of additional material. Consequently, it is necessary to warm the collected oil several degrees which requires a disproportionate expenditure of energy and time so that this stage can often be decisive in determining the capacity of the entire oil combating operation.
The purpose of the present invention is accordingly to provide a new device based on the principle of the screw conveyor, which device is adapted to pumping thick collected oil in particular but also other materials having poor flow. The invention is characterized in that the feed promoting means comprises at least one vane attached to the shell and extending outwardly in a curved or inclined fashion so as to feed the material towards the shell as the shell rotates, and that in the shell at the foot of the feeding vane, on the collection side thereof, is an aperture for the delivery of the material to the screw within the shell.
The essential idea in the invention is thus the arrangement of forced feeding of the material to the inlet apertures of the screw. The feed vanes are preferably larger than the screw in their radial projection and are naturally dimensioned on the basis of experience so as to achieve the optimum result. For example, with a single vane its projection may be of the same order of magnitude as the diameter of the feed screw. The shell may have several vanes, but an advantageous embodiment is one having two vanes diametrically opposed. In this embodiment the rotation of the shell is balanced and there are not too many apertures, which is important for the operation of the screw conveyor. Since the shell rotates in the opposite direction with respect to the screw the oil does not appreciably escape out of the apertures. The screw and shell are preferably fitted with their own hydraulic motors which are separately adjustable as to their speed of rotation.
The invention together with its other advantages and embodiments is described in greater detail in the following by means of an example and with reference to the accompanying drawings, in which
FIG. 1 shows diagrammatically a device according to the invention as seen from the side and partially sectioned; FIG. 2 shows the lower part of the device as seen from above and partially sectioned;
FIG. 3 shows the lower part of the device as seen from the side; and
FIG. 4 shows a perspective view of the shell of the device.
In the embodiment shown in the figures there are two circular, rigid horizontal plates 1 and 2 joined to each other by vertical rods 3 distributed around the periphery. On top of this structure is located a cylindrical extension 4 joined by a flange 5 to said upper plate 1 and by a flange 6 to an outlet pipe 7.
Within said cylindrical extension 4 is located a screw 8 comp
REFERENCES:
patent: 2771036 (1956-11-01), Baez
patent: 3680975 (1972-08-01), Smith et al.
patent: 3756573 (1973-09-01), Sponseller
patent: 4197092 (1980-04-01), Bretz
Garrett Robert E.
Kwon John T.
Oy Lars Lundin Patent Ab
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