US1879803A - Rotary pump - Google Patents

Description

Sept. 27, 1932/ ROTARY PUMP Filed Jan. 27-. 1930 A. G. JOHNSON 1,879,803

Patented Sepia 27, 1932 UNITED STATES ANDREW e. JOHNSON, or Lrivoomv,

ROTARY Pour Application flled J'anuai-y 27, 1930. s riaii' ml423,797.- 5

My invention relates to rotary pumps, its primary object being the provision of features which will enable the pump to much more effectively hold the pressures than the 5 pumps at present in use.

Another of my objects is the provision of a water seal beneath the turbine, the water seal being designed for the purpose of preventing losses in pressure.

It is also my object to providea turbine in a casing with a water seal in which the water is constantly flowing so as to eliminate any sand which enters the water seal.

Another of my objects is the provision of is a rotary pump in the form of a single casting which is so designed that it may readily be cast at a relatively low cost and without requiring much machining or other expensive operations. Having in View these ob ects and others which will be pointed out in the following description, I will now refer to the drawing,

in which Figure l is a view-in perspective of the rotor of the pump;

Figure 2 is a median vertical sectional view of the rotor and of the casing."-

The rotor as shown in Figure 1 includes two parallel annuli 10 and 11, both of which are flanged at their inner peripheries. The flange 12 of the annulus 10 constitutes a hub for the shaft which drives the rotor. The wall is thickened at the corner of the annulus 10 and its flange 12 and this wall is curved as shown in Figure 2 so as to facilitate the passage of water. The annulus 11 is narrower than the-annulus 10 but its external diameter is equal to that of the annulus 10. It is provided with a flange 13 terminating somewhat short of the free extremity of the flange 12. The flanges 12 and 13 are spaced from each other a distance which is approximately equal to the distance between the annuli 10 and 11. The annuli 1O and-11 are 45 connected to each other by means of a plurality of turbine blades 14?, these being of integral construction with the two annuli. The outer extremities of the turbine blades ll are beveled so that their surfaces lie within the cylindrical surface determined by the external peripheries of the two annuli. The I vinner ends of the blades 143are similarly bev v determines'a cylindrical surface.

When thepump as .above' described isin position within a casing as shown in Figure 7 p 2 and when it is rotated rapidly bymeans ofa c'entra'lsh'aft, the water will bedrawn eledin a manner 'suchathat their movement" from the well andforced outwardly between the annulilO and 11, the pressure being ex-jeo erted by centrifugal force after the water: begins to assume "a substantially horizontal 1 path; This principle of operation, however, is more or less common to nearly all I rotary P lP i '2 The mounting of'rotary pumps-in their casing isoften such that a differential. in pressures'is set up"with resultant loss "of OW-' er. In order toobviatethis difiiculty I ave provided a water seal for preventing the re- 7 lease of pressure. On the lower surface of the annulus 11 T providea series of blades 15. In. the 1 present instance/these blades have the general form of the blades 14, the

number and position or the blades 14 and 15 being also equal. The blades 15, however,-

terminate short of the flange 13 and at their outer extremities they also terminate shorter the outer periphery of the annulus 11. The blades 15 are also beveled into cylindrical so form at their rear or free extremities while the forward or-inner extremities are beveled on both surfaces into wedge shape. This and the general shape of the blades 15 gives the entire blade assembly more or less of a s5 stream-line form, thus reducing the friction of the'w'ater against their surfaces.

The casing includes two interfitting parts 16 and 17 adapted-to receive'the rotor and its shaft 18. In'pumps of this type it is sometimes desirable that they be arranged in stages so as to provide the maximum lift. By arranging the casing-in the form of com plementary parts, the casing'may be built up to any desired height toprovide a series of chambers for successive rotors. The annula'r' platform 19 of the casing member 17 is spaced a slight distance below'the lower edges of the blades 15. The iwater within the casing above and below the platform 10 19 is under considerable ressure and it is in constant movement. T e pressures of the two bodies of water above and below the platform 19 are, however, different so that a flow will occur through the water seal which will carry with it all of the sand and grit and which will thus prevent the undue wear on the rotor and on the platform 19.

When the rotary pump, is arranged as shown in Figure 2 either singly or in stages and when the rotor moves rapidly on its axis,

there is a constant fiowof water in an upward direction within the casing. The differences in pressures above and belowthe platform 19 ordinarily cause a drop in pressure because of the leakage and therefore result in a loss of power. The arrangement of the blades 15, however, prevents excessive leakage, so that the'powermay be fully utilized. At thesame timeall grit is automatically removed, so that the wear is re- 7 duced to a minimum.

The rotor as shown is cast in one piece and its manufacture is simple and relatively 1nderstoodby others skilledin the art to which it pertains, what I claim as new and desire to secure by Letters Patent oftheUnited States'is; I

1. A rotary pump including a vertical shaft surrounded by pairs of casing members adaptedfor assemblyin stages,each pair of said casing members-containing a rotor adapted to be driven 'by saidevertical shaft,

said rotor including a circular disc having turbine blades projecting upwardly there-- from, and a plurality of spiral turbine blades depending from said circular disc and posi-' tioned tangentially with respect to said rotor,

the lower of said casing members of each pair having an annular upper surface cooperating with saiddepending bladesto provide a water seal in the form of a slowly moving body of water. p

2. A rotary pump including-a vertical shaft surrounded by pairs of casing members adapted for assembly in stages, each pair of said casing members containing .a rotor adapted to be driven by said vertical shaft, said rotor including a circular disc having turbine blades pro ecting upwardly therefrom, and a plurality of spiral turbine blades depending from said circular disc and positioned tangentially with respect to said rotor, the lower of said casing members of each pair having an annular upper surface cooperating with said depending blades to provide a water seal in the form of a slowly moving body of water, the inlet to the passageway between said depending blades and said casing member being reduced to retard the flow into the passageway for reducing the velocity and thereby causing sand and other foreign matter to settle.

In testimony whereof I afiix my signature.

' ANDREW G. JOHNSON.

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