US1430894A

US1430894A - Screw pump

Info

Publication number: US1430894A
Application number: US373623A
Authority: US
Inventors: Frank A Fay
Original assignee: WILLIAM E QUIMBY Inc
Current assignee: WILLIAM E QUIMBY Inc
Priority date: 1920-04-13
Filing date: 1920-04-13
Publication date: 1922-10-03
Anticipated expiration: 1939-10-03

Description

F. A. FAY.

SCREW PUMP.

APPLICATION FILED APR. I3, 1920.

Patent @at 3, E922 uli m d Flu C E nih QN E1 N Q M f w N v m. mw. 55mm W NN d @N N. w

LABQSQQL @y M'ml mwen/Er Patented @cto 3l, i922..

entre FRANK A. FAY, OF CALDWELL, NEW JERSEY, .ASSIGNOR T0 WILLIEAM E. QUIMBY, INC., 0F NEWARK, NEW FERSEY, .A CORPORATION-0F NEW YRK.

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lapplication lecl April-13,

To all whom t may concern:

Be it known that l, F RANK A. FAY, a citizen of the United States, residingat Caldwell, in the county of Essex and State of New Jersey, have invented certain new and useful improvements in Screw Pumps, of which the following is a specification.

This invention relates to a screwpump of the type illustrated in Letters Patent No.- 529,837,V -issued on November 27, 1894, to William E. Quimby, in which two pairs of intermeshing screws, right and left andleft and right, respectively, are mounted in the same horizontal plane on .parallel shafts journaled in bearings in the-heads of a shell bored to fit the perimeters of the unintermeshed portions of the screws. rlhe screws have threads of two or more convolutions and projecting hollow cores which, by holding the outer ends of the threads spaced apart from the heads of the casing and their inner ends spaced apart from each other, provide two endchambers and one centrally located chamber, and the necessary inlet and outlet openings to these chambers are formed through the lower and upper walls of the casing.

j lt has been found in practice that suchv a pump, while exceedingly ecient with low pressures, could not 'be used commercially Awith pressures exceeding-about two hundred pounds per square inch, since the wearing away not only of the vscrews but of the inner walls of the shell,'due -to the unbalanced vportions of the screws adjoining, and the vertical thruston the screw shafts within, the central chamber soon produced a slip of the fluid which destroyed the eciency of the pump. y p t Bymy present invention, which conslsts briefly in providing additional bearings for the two shafts within the chamber at the center of the shell, l have obviated this diiiiculty and have produced a pump which can be operated efficiently at pressures of ve hundred pounds and upwards and hence has a new and much widerl eld of utility, being adapted, for example, for use as a high pressure pump for pumping heavy fuel oils.

rlhe invention is illustrated in the accompanying drawings, in which- Figure l isa plan view, partly 1n horizontal section, 4of a Quimby screw pump embodying my improvements; Fig. 2, a side 1920. Serial No. 373,623.'

elevation, partly in verticalJ section; and A Fig. 3, a transverse vertical section atthe longitudinal center of the shell. j

As here shown, the shell l is mounted upon the usual bed-plate, and the two shafts 2 and 3, carrying the screws 4: 5 and 6 7 and extendigig through stuiing boxes in the heads of the shell, are journaled in bearings in standards carried by the bed-plate and are geared together and driven by a pulley fixed to the end of one of the shafts, all in thefusual or in any suitable manner.

For the new intermediate bearings for the screw shafts, a standard is provided` by a partial transverse wall 8, which divides the lower part only of the slightly elongated central chamber 9 and has formed therein intersecting cylindrical openings lOand ll corresponding to the bore of the shell and in alignmenttherewith, and two Collars l2 and 13, flattened along one side, which, serving as journal boxes, are rotatably secured upon the respective shafts between the opposed ends of the hollow cores of the screws and, when the parts of the pump are assembled, fit into and are held against rotation within the openings in the standard. rlhe two collars may, of course, be integral, if desired.

By the central bearing support thus provided for the screw shafts, the unbalanced portions ofthe exposed screw threads are counter-balanced and the wearito which the parts have heretofore been subjected b the vertical thrust thereon 1s substantially e iminated, and what has been for all practical purposes a low pressure pump is converted 90 into an efficient and durable high pressure J pump.

What I claim as new, and desire to secure by Letters Patent, isj l. A screw pump of the type described comprising a suitable casing, two parallel shafts journaled 'in bearings in the heads of the casing and mounted thereontwo pairs of intermeshing right and left screws with threads having a plurality of convolutions and held spaced apart at their inner ends to form within the shell a short centrally located chamber open throughout to the ends of the screws, and a supplementary bearing for the screw shafts intermediate the opposed inner ends of the screws.

2. ln a screw pump of the type described, the combination, with a suitable shell andf .l parts of the pump 10 vtwo pairs of intermeshing right and left screws mounted upon parallel shafts mounted in the heads ofthe shell and spaced apart -at their inner ends to form Within the shell a short central chamber open throughout the ends yof the screws, of means providing a bearing for the shafts withinthe central chamber whichv permit the assembling of the with the screws in place upon the shafts.

3. In a screw pump of the character described, the combination with a suitable shell and two rpairs of intermeshing right and left screws, with threadshaving a pluralityA of convolutions -and hollow cores projecting from the`ends thereof, mounted-uponl .FRANK A. BAY.