US1932881A - Pump - Google Patents

Description

oct. 31, 11933.

H. o. BOWEN Er AL 1,932,881

PUMP

2 Sheets-Sheet l Filed Aug. 22, 1950 oct. 31, 1933. H Q BOWEN Er AL 1,932,881

i PUMP Filed Aug. 22, 1930 2 Sheets-Sheet 2 Patented @et 3l, '31933l PATET OFFICE PUll/[P Harry 0. Bowen and Hyrum Krause, Salt Lake City, Utah Application August 22, 1930. Serial No. 476,964

3 Claims.

This invention relates to a pump, and its principal objects are:

First-To be simple, eicient and easily installed.

Second.-To be applicable for the raising of liquids from substantially any depth.

Third-Tope economical in cost of operation.

Fourth-To be adapted for multi-stage pumping.

In attaining these objects, we employ rotatable runners or impellers having cupped blades with warped impelling surfaces operative in a cylindrical casing, and effective to propel a stream of uid, generally liquid, along the axis of rotation.

A desirable form of this invention includes an auxiliary impeller or pick-up axially spaced somewhat apart from, and ahead of, the impeller proper or booster. In the space between the pick-up and booster is located a bearing spider serving as a deflector and having a journal for a shaft on which the pick-up and booster are rigidly mounted. The three elements, pick-up, bearing spider and booster, form an impelling unit. One or more impelling units having a shaft in common, with a corresponding casing, may constitute a pump; in the latter instance, of the multi-stage type.

The bearing spider is stationary in the casing, and frictonally engages the latter for support, whereby it becomes possible, in a multi-stage pump, to use a long tube for the casing. In such a multi-stage pump, the impelling units, spaced apart from one another along the common operating shaft, may be slidably introduced or forced i into the tube, while the shaft is freely rotatable at all times.

The pick-'up member has preferably one or more cupped arms which, when rotated in the proper direction, act as scoops to pick up the liquid and project it upwardly. As the liquid leaves the pick-up member, it is projected directly along tangent lines into the path which is cut transversely by the curved blades of the deector, the stream of liquid being substantially reversed in its directional flow and projected into the path of the booster, by which the liquid is impelled along the desired line of travel.

One purpose of the deflector is to substantially prevent the entrapping of air in pockets.

The present application for patent is a continuation in part of the application filed by us November 26, 1928, Serial No. 322,046.

The features of this invention, for which the protection of Letters Patent of the United States is desired, are collectively grouped in the claims concluding this specification.

In the drawings,

Fig. 1 represents in elevation, an impelling unit coupled to the operating shaft;

Fig. 2, a longitudinal center section taken therethrough;

' Fig. 3, a transverse section taken on line 3 3, Fig. l;

Fig. 4, an enlargement of substantially the portion embraced within the broken line 4, Fig. 3;

Fig. 5, a plan of an impeller detached;

Fig. 6, a view in perspective of an auxiliary impeller or pickeup;

Fig. 7, a vertical center section taken through a well casing with the operating shaft and its impellers and bearings mounted thereon; all in the operative position within the casing;

Fig. 8, a longitudinal center section taken through a bearing unit;

Fig. 9, a vertical axial section taken through a single horizontal pumping unit;

Fig. 10, an individual impelling unit in perspective;

Fig. 11, an individual impelling unit in elevation, drawn to a scale larger than that used in Fig. 9;

Fig. 12, a plan of an impeller of modified and preferred design; and,

Fig. 13, a section taken on line 13-13 in Fig. 12.

Referring to theA drawings, the numeral 10 designates a booster impeller having a hub 12 and a plurality of, in this instance four, vanes or blades 14. The numeral 15 designates a pick-up impeller comprising a plurality of, in this instance two, vanes or blades 16 extending from a hub 17.

It is to be noted that the blades 16 are shaped somewhat dierently from the blades 14, though the direction of curvature is the same in both. This is occasioned by the difference in the functions which they fulfill. For instance, the blades 16 serve essentially as dippers and projectors, that is to say, they dip into a liquid and project it upwardly, so that it may be caught up by the impeller 10, which exerts principally a lifting action upon the liquid. The impellers 15 and 10 are spaced apart from each other, and placed between them is a bearing spider 18, from which extend a plurality of, in this instance four, vanes or blades 19, these latter being preferably integral with a hub 20. The curvature of blades 19 is opposite that of blades 14 and 16.

As a. matter of convenient mounting, stub shafts 21 may be provided, these having the body `Woodruffv keys 29, upon the shouldered portions 25 and 26.

In order to allow the blades of impellers 10 and l to come into a. closely spaced relation with the blades of the spider 18, as indicated aty 30 and 31, it is convenient to interpose rings or washers 32 made of anti-friction metal, such as bronze, between the hubs of the runners and the hub of the bearing spider.

The assemblage, consisting of the parts just named, that is to say, stub shaft 21, bearing spider 18, and impellers 10 and 15, together with a coupling sleeve 34 and a tail nut 35, may form an impelling unit.

Another assemblage, Fig. 8, consisting of the stub shaft 52, the bearing spider 53, and the coupling sleeves 34, may form a convenient bearing spider unit.

The utility of the construction by units Will readily be perceived when it is noticed that any desired number of impelling units may be combined with any desired number of bearing units, as typied in Fig. 7, these various units being connected to one another by light shafts 38,39, 40 and 41, in the manner shown in detail in Fig. 2, the ends of the shafts being fastened in the respective couplings 34 by means of the threaded ends 42. The couplings 34 are prevented from becoming unfastened inadvertently, by set screws, such as those of the hollow-head type, indicated at 43.

The upper or driving shaft section 45 may receive its motion from any well known source, such as a vertical electric motor (notshown) direct connected.

At comparatively low speeds, the pump shaft turns to a certain degree, in thev bearings of spiders 18, but as the speed of rotation is increased, a point is reached where the centrifugal force is sufficient to bring balls 49 into closer contact with surfaces 47 and surface 48, thereby locking the spiders to the casing, which holds the spiders stationary, while the shaft rotates freely in the spider bearings. driving shaft slows down or ceases, the spiders again become loose within the casing. Therefore, it becomes necessary that all the rotative parts, together with their bearings, shall hang in suspension from a support above, which can readily be accomplished, for instance, by means of a thrust bearing (not shown) separate from, or built into, the electric motor.

In the construction just described, the circumferential extremities of arms 19 have recesses 46, defined by surfaces 47, forming ball races which are substantially coincident with chords of the bearing spider circumference. The surfaces 47, in association with the inner surfaces 48, form substantially wedge-shaped pockets in which the balls 49 may be disposed. The balls may be pressed forwardly into contact with surfaces 47 and 48, by compression springs' 50, reacting against retainers 51, which latter are rigidly disposed in the corresponding spider arms.

While the curvature of the booster and thel curvature of the deflector may vary within cer- As the rotation of the tain reasonable limits, yet the specific forms thereof, which I have found most satisfactory after considerable experimentation, conform very closely to the shapes illustrated in Figs. 10 to 13.

In Figs. 10 and 12, the curves 61-2 represent a horizontal trace of the booster impelling surfaces formed on the inside of the blades 61-1. The curves 61--2 are preferably composed of circular arcs of various radii, and form a composite arc in which the shorter radii are located nearest the axis of rotation of the booster. It will be noted in Fig. 12 that a chord 61-3 of the curve 61-2 substantially coincides with a radius of the impeller. It will also be noted that the curve 61-4 in Fig. 13, representing a vertical trace of the impelling surface cut out by a plane passed substantially perpendicular to the chord joining the extremities of the horizontal trace of said impelling surface, has its chord 6l-5, joining the extremities of the curve 61-4, inclined to a perpendicular 61-6 so as to make an acute angle-therewith. The line 61-7 is tangent to the curve 61,-4 at its upper extremity, and the line 61-8 is tangent to the same curve at its lower extremity. In the preferred form of the curve 61-4, the angle formed between the tangent 61-7 and the perpendicular 61--6 is very nearly equal to the angle formed between the tangent 61-8 and the horizontal line 61-9. The latter angle defines substantially a chisel edge along the cutting line 61-10 of the booster blade. This chisel edge cuts through the liquid, which is finally discharged upwardly along the tangent 6l7. A

The booster blades preferably increase gradually in thickness back from the chisel point, and have their greatest thickness in close proximity to the upper face 61-12.

An upwardly extending curved chisel edge 61-13 is formed along the outer extremity of each blade, and in plan or in horizontal crosssection, the configuration of the blade increases in thickness back from the chisel edge 61--13, achieving its greatest thickness at substantially the root 61-14 of the blade where the curve 61-2 merges into the curve 61-15, which delines a horizontal trace of the back surface of the blade.

The blades 63-1 of the deflector in plan, are curved in reverse order to the curvature in plan of pick-up blades 60-1 and booster blades 61-1, as indicated in Fig. 10. The curvature up and down of the blade 63-1 is substantially as indicated at 63-2, forming cupped surfaces each of which receives the liquid from the pick-up impeller substantially along a corresponding tangent line 63-3, deflecting the stream so as to be finally discharged along a corresponding tangent 63-4 into the path of the booster blades 61-1. This establishes a condition where the cupped surfaces of the deflector blades, receive and discharge fluid respectively, along lines which are tangent to the traces of planes intersecting the cupped blades up and down, in points located substantially at the two extremities of the traces. As a result, the two tangents in any trace plane are oppositely inclined to a perpendicular in common, the said perpendicular, of course, being erected on the plane of the deector.

In the pump shown in Fig. 9, the pick-up impeller 66 andthe booster impeller 61 may be rigidly mounted on a shaft 62, the latter being rotatable in a bearing spider 63 having arms 63-1 snugly tted to hold frictionally in a casing consisting of an elbow structure 64. This structure may have ribs 64-1, 64-2 and 64-3, and a foot 694.

The shaft 62 may be rotatably mounted in bearing sleeves 65 and 75, threaded in bosses 64-5 and 67-1, respectively. Boss 64-5 may be a part of elbow 64 and boss 67--1 a part of another elbow 67, the two elbows being connected to each other by means of bolts 68.

Sleeve 65 may have a polygonal head 65-1 and at its outer end be provided with a threaded cap 69, which serves as a stuffing box.

Shaft 62 may have a thrust bearing 76 supported in a cap 78 threaded on boss 64-5. The shaft may be driven by an electric motor 70 connected thereto by a coupling 71.

A suction pipe 72 may be connected to elbow 64 and a standpipe 73 to the elbow 67.

When the shaft 62 is rotated in the proper direction, indicated by arrows 751, Fig. 10, liquid may be lifted through the pipe 72 and projected up into the pipe 73, following substantially a path through the impelling unit, indicated by the dotted arrows.

Units composed of the members 60, 61 and 63, may be spaced apart to form a vertical multistage pumping mechanism similar to that illustrated in Fig. 7.

We are aware that some of the features herein shown and described, are old in one form or another, and hence, we restrict our invention in general to the novel arrangement of a pump unit, wherein a pick-up impeller and a boosting impeller are spaced apart from each other, the blades of the two said impellers in place, being of the same directional curvature, with a deector located between the two impellers, the deector having its blades of a curvature, in plan, opposite to the curvature of the impellers. The novelty of our invention also extends to a mounting in combination with the elements just mentioned.

While a specific embodiment of this invention is herein shown and described, it is to be clearly understood that variations within the scope of the accompanying claims, may be resorted to without jeopardizing our patent protection.

Having fully described our invention, what we claim is:

1. A pump including in combination, two impellers having blades curved in plan, said impellers being spaced axially apart from each other, and a delector located axially between said impellers; said deector having blades which in plan are curved in reverse order to the plan curvature of said impellers, and which are cupped up. and down so that tangents at the extremities of cupped traces are oppositely inclined to a perpendicular in common.

2. A pump unit, including in combination, a 9y stub shaft having a body, impeller-mounting portions extending from said body, threaded portions extending from said impeller-mounting portions, a bearing member rotatably mounted on said body portion, impeller elements rigidly mounted on said impeller-mounting portions, and retaining members engaging said threaded portions.

3. A pump unit, including in combination, a.` driving shaft, a pick-up impeller and a boosting 105 impeller spaced apart from each other and rigidly mounted on said drive shaft, both said impellers having arms of similar directional curvature in plan, and a bearing intermediate said pick-up impeller and said boosting impeller, said bearing 110 having blades projecting therefrom, the curvature of said blades being reversed in plan to the curvature of the pick-up and boosting blades.

HARRY O. BOWEN.

11'5 HYRUM KaAUsE. 1

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