US1959223A - Deep-well turbine pump - Google Patents

Description

May l5, 1934. R. E. swANsoN DEEP WELL TURBINE PUMP.

Filed May 14, 1930 INI/ENTOR. ma( m;

A TTORNEYI Patented May 15, 1934- afer ofjFFICE DEEP-WELL TUEBINE PUMP Raymond E. Swanson, Lawrenceburg, Ind., as signor to A. D. Cook, Inc., Lawrenceburg, Ind., a corporation of Indiana Application May 14, 1930, Serial No. 452,427

4 Claims.

My invention relates to deep-well turbine pumps and to a particular pump construction in which the pump or impeller shaft is non-exposed to the corrosive action of the materials pumped.

It has been customary in deep-well turbine pumps to expose the pump shaft to the well water at some point or another. Ordinarily the pump shafts are exposed to the corrosive action of the well water pumped except where the impellers are mounted or where the shaft passes through a packing box into a bearing. The function of packing boxes in such combinations is to keep grease and sand out of the bowl bushings or out of such part as serves for bearings for the deepwell turbine pump shaft.

It has further been a common practice toy use spacing sleeves between the impeller, in which case the shaft is enclosed except at the bottom between the inlet case bearing and the pump 20 shaft nut, and at the top, just below the lower packing in the outlet case. In this type of construction there is further exposure of the impeller shaft at the by-pass in the outlet case.

In some localities well water contains certain chemical ingredients which cause it to attack the impeller shaft and, either by corrosion or electrolytic action, cause it to be eaten away at the exposed portions, which often weaken to such an extent that breaks occur. For this reason expensive metals such as stainless steel, rustless iron, Tobin bronze, and Monel metal, have been employed for the construction of the shaft. This very greatly increases the expense, as the material of which the impeller shaft is made is not only more costly, but it is very difcult to machine.

It is the object of my invention to protect the pump or impeller shaft in a deep well pump from corrosion. It is further my object to prevent corrosion of the impeller shaft by completely enclosing it in certain portions so that it will not be exposed to the corrosive action of the liquid pumped. In such portions of the impeller shaft which are exposed to the liquid pumped it is my object to prevent any circulation of liquid, as liquid which is continuously in contact with the impeller shaft without circulation loses its corrosive action.

Specifically it is the object of my invention to completely enclose the impeller shaft in spaces from a point well above the by-pass to the extreme bottom, and to so arrange the impellers and the spacers so that entire freedom from corrosive action of the shaft is accomplished.

The above objects and other objects to which reference will be made in the ensuing disclosure I accomplish by that certain combination andarrangement lof parts of which I have shown a pre ferred modification.

Referring to the drawing:

The figure represents a side elevationv of my impeller pump casing with the right hand half of the combination shown in vertical section.

The iine shaft which it will be understood extends down through the well casing and is driven by horizontal rotatable mechanism at the delivery level of the casing is indicated at l.

By means of a pump shaft coupling 2 the pump shaft or impeller shaft 3 is connected to the line shaft. The pump shaft extends down through the oil tube 4. l

Three spacers 5 which may be termed impeller spacers or spacing sleeves, are mounted on the shaft 3. Then Vimpellers 6 and spacers 7 are alternately slipped on to the pump shaft 3. Below the last impeller is mounted a long spacer 8 which runs down into the inlet case bearing 9.

At the extreme bottom of the shaft 3 is the pump shaft nut 10 which, when drawn up, jams all the impellers and spacers tightly end to end. The pump shaft nut and the lower end of theV impeller shaft rotate in the grease chamber 11. The grease in this chamber also lubricates the lower bearing.

It will be noted that the shaft is completely enclosed at the by-pass to the well indicated at 12. Should any water get into the cavity indicated at 13 it will of course come in contact with the shaft, but since this water will become stagnant or lose its corrosive or electrolytic activity very quickly, it will not attack the standard steel shaft which it is my purpose to employ.

Referring further to the combination illustrated the column is indicated at 14, the column having a flange 15 which is secured with a cap screw 16 to the upper flange 17 of the outlet case 18. The upper bowl 19 is bolted with bolts 20 to the lower liange of the outlet case. The lower flange of this upper impeller bowl 19 is bolted with bolts 21 or cap screws to the upper flange of the next lower impeller bowl 22. Similarly the impeller bowl 22 which encloses the lower impeller has its lower ange bolted to the inlet case 23 with cap screws 24. The suction tube fiange 25 is also secured with cap screws 26 to the lower flange 27 of the inlet case. A fixed collar 30 is secured on the shaft as indicated to retain the impeller spacers when they are drawn together by the nut 10.

It will thus be observed that I have provided a construction which due to the alternate mounting of the pump shaft or impellers and spacers,

protects the pump shaft from the corrosive action of the liquid pumped.

The by-pass in any turbine pump is for the purpose of admitting back into the well the water which leaks by the packing just below the bypass. It Will be noted in the illustration that the packing on my proposed combination is indicated at 28, 29.

Another improvement in detail which I consider important is the spacing of the edges 32 and 33 of the vanes of the bowls 19 and 22, respectively, out from the peripheries 31 of the impellers 34. This not only eliminates the need of machining the cutting edges 32 and 33 of the bowl vanes, usually also necessitating chipping and hand work for attaining the close t between the impeller periphery and the bowl vanes as in such prior devices as I am aware of, but also permitting the bowl vane edges to retain the hard crust or scale incident to the casting of the bowl. Since the friction of the discharge at the bowl vane edges is considerable, having a considerable erosive effect, this maintenance of the hardness of these parts greatly conduces to the durability of the pump.

The hub 35 in the inlet case 23 has its upper part close around the shaft and its covering tube, while below it has an annular recess into which the grease chamber 11 has its upper reduced eX- tension 36 screwed, confining the packing 29 against the top of the annular space in the hub, this grease chamber 11 surrounding the lower end of the shaft. This compact combination allows an especially direct passage up to the irnpeller 6.

Having thus described my invention, what I claim is new and desire to secure by Letters Patent is:

1. 'In a pump, an uprightshaft, an impeller having a liquid-excluding nt around said shaft, means preventing said impeller from moving aX- ially on said shaft in one direction, a covering having a liquid-excluding fit around said shaft, holding means on said shaft holding said covering in substantially liquid-excluding Contact with said impeller and preventing movement of said impeller axially on the shaft in the other direction, a bearing around said covering between said holding means and said impeller, a packing at the end of said bearing nearer said impeller, casing meanssurrounding said bearing, and a member supportedby said casing and removably receiving and supporting said bearing and closely embracing said covering, confining said packing to said bearing.

2. In a pump, an upright shaft, an impeller having a liquid-excluding fit around said shaft, a collar Xed around said shaft, a covering having a liquid-excluding fit around said shaft, with its end against said collar, said impeller having one end against the other end of said covering, a bearing around said covering between said collar and said impeller, a packing at the end of said bearing nearer said impeller, casing means surroundingv end bearing, a member supported by said casing and removably receiving and supporting said bearing and closely embracing said covering, confining said packing to said bearing, means having a liquid-tight t around said shaft, against the other end of said impeller, a nut screwed on said shaft holding said means against said impeller, a bearing around a part of said means between said impeller and said nut, a packing at the end of said bearing nearer said impeller, casing means surrounding said bearing, and a member supported by said casing and removably receiving and supporting said bearing and closely embracing said part of said means, confining said packing to said bearing.

3. In a pump, a rotary impeller having peripheral outlet edges, a cast metal-enclosure for said impeller having vanes `extending in toward and substantially parallel with said impeller outlet edges and subject to erosion by the discharge from said impeller, the inward extension of said 105 vanes relative to the outward extension .of said impeller outlet edges being such that the vanes and edges are operatively'close together but that .a substantial space is left between the inner edges of the vanes and the impeller outlet edges, so 110 that the vane edges may be left unfinished, and said Vane edges being unfinished, with the inherent hardness of the cast surfaces of said vane edges maintained to resist erosion by discharge from the-impeller.

4. In apump, `an upright shaft, a lower inlet and means operated by said shaft for raising liquid through said inlet, a hub mounted on the walls of said inlet with its upper part surrounding said shaft and its lower part having an annular recess around said shaft, a lubricating chamber around the lower end of said shaft comprising an upper part held in said annular recess and removably supporting the chamber in the hub, and packing held between this upper part of thelubricating chamber and said upper part of the hub.

RAYMOND E. SWANSON.

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