US1772862A - Pump - Google Patents

Description

PUMP' Filed March 23. 1929 Patented 12, 1930 UNITED vsrA'rl-:s

PA'rlalKrr oFFlcE y JULIUS W. GERHARD, 0F ST. LOUIS, MISSOURI, ASSIGNOR T0 SOUTHERN ACID AND SULPHUR COMPANY, INC., OF ST. LOUIS, MISSOURI, A CORPORATION OF VIRGINIA PUMP Application filed Harch 23, 1929. Serial No. 849,318.

My linvention relates to pumps and particularly to pumps of the kind intended for 'impelling acids or corrosive liquids. The

principal 'obj ect of the invention is to produce a pump of this kind that will make an eicient use of the driving power, in which the element of wear and tear will be kept as low as practicable. The invention consists in the pump hereinafter described and claimed.

In the accompanying drawing which forms part of this specification, and wherein like reference numerals refer to like parts wherever they occur,

Fig. 1 is a vertical sectional view of a embodying my invention;

Fig. 2 is an elevation of the pump with the enclosing shell removed and looking at right angles to the plane of Fig. 1;

Fig. 3 is a vert-icalsectional view of the main antifriction bearingof the pump; Fig. 4 is a similar sectional view of the uppermost antifriction bearing of said pump; and

Fig. 5'is a horizontal sectional view on the line 5-5 of Fig. 2.

.Pump

In the manufacture of sulphuric acid, hotacid' solution accumulates in the acid pot or tankv to the depth of several feet; and from this tank the hot solution is circulated by the pump through a pipe system back to the acid pot. Cn account of the heat and corrosiveyness ofthe acid, the pumps heretofore used have been subject to rapid wear and tear and have required so `much repair and replacement of parts that the cost of maintaining them, including the loss of time while they are'out lof commission, has been very considerable.

' According to the present invention, the pump is made with avertical casing A open at its top and at its bottom and provided about midway between topv and bottom with an inlet opening 1. Atall of these openings,

' top, bottom and side, are provided circumferential flanges that are perforated for bolts by which the adjacent parts maybe secured thereto. Cn the exterior of the casing A near the top thereof is a perforated bracket 2 by which said casing may be secured in position.

Suspended from the top of the caslg A is the barrel of the pump which extends entirely through said casing. The upper portion of the barrel comprises a skeleton cage B in the form of a lower ring 3 that rests upon and is bolted to the top flangeof said casing A, andv .side opening 1 therein. Opposite said side opening l, the hollow cylindrical portion C of said barrel has a large opening 6 in its side for the admission of liquid to the interior thereof, and there is a vertical rib 7 on the interior of said barrel extending from a point some distance above said openlng to a point some distance below it. The portion ofthe barrel below said side opening 6 in the hollow cylindrical portion C is reduced in diameter, as at 8, and screwthreaded n the exterior of said reduced portion; and uponsaid reduced portion 8 is threaded an extension Dof the barrel, which extension is likewise4 reduced, as at 9, and threaded at its lower end and upon its reduced end is a similar extension E. That is, the lower end of the body'of the hollow cylindrical portion C of the barrel is `reduced in diameter. and the lower end of each of the extensions D and E, respectively, is likewisereduced in diameter.

On top of the cage B if the pump barrel is mounted a hollow housing or shell F for the driving shaft l0 which is suitably connected to a motor orengine (not shown). The lower end of said housing F has a circumferential rib or ange 11 that rests on top of the upper` ring 4 of the cage B of the barrel and is secured thereto by bolts or cap screws 12. Said housing F has an annular rib 13 formed on its inner wall near the bot# tom to form an annular seat for the outer raceway member 14 of a. ball bearing adapted for cooperation with a series of balls 15. This outer raceway member is positioned by a ring with a thrust rib 20 at its lower end.

The inner raceway member 19 lits on a sleeve 21 whose lower end is provided with a circumferential rib 22 on the exterior thereof, which sleeve forms an angular seat for said inner raceway member. The upper portion Aof said sleeve is of reduced outside diameter and provided on the exterior thereof with a screwthread, which is engaged by the screwthread of an adjusting ring 23 whose end bears against the top of said inner raceway member. whose lower end has threaded engagement with a hole in a plate 16 that is secured to the bottom of the housing. A

The propeller shaft 10 extends vertically through said housing F and the two sleeves 21 and 24 therein and the plate at the bottom of said housing and has its lower end formed for coupling with the propeller shaft 25 of the pump. Near its top, Ithe housing F has a rib 26 inside thereof upon which rests a perforated closure plate 27. Still nearer the top, said casing has a second offset forming a shoulder or seat for the outer raceway member 28 of an upper bearing, adapted for cooperation with two series of balls 29. The inner raceway member 30 is mounted on a sleeve member 31 that is secured to the shaft 10; and the upper end of the housing F is closed by means of an end plate 32 secured to the top of the housing by means of cap screws 33. The annular space between the upper end portion of the pump shaft 25 and the pump barrel is closed by means of a sealing ring 25L which is supported in the opening in the bottom of the skeleton cage B of said pump barrel.

The pump shaft 25 is located axially in the barrel of the pump, .with its up er end coupled endwise to the propeller sha 10 by a suitable coupling located opposite the openings in the cage B. In the construction illus'- trated, the pump shaft 25 is preferably a hollow cone with its large diameter at*` the top where it is provided with an exterior circumferential rib 34 that is perforated to receive locking bolts 35 that pass through a similar flange 36 at the bottom of the propeller shaft 10. The pump shaft 25 is supported wholly by the propeller shaft 10 and extends entirely through the pump barrel. The lower end of the main body member C of the pump barrel has a spider 37, preferably formed integral therewith with an axial opening therethrough which is provided with a bushing or bearing member38 that servesasa guide The sleeve 21 fits over a sleeve 24 and bearing for the pump shaft. Likewise the bottom member E of the pump barrel has a spider 39 therein which has an axial bore in which is mounted a bushing 40 that serves as a guide and bearing for the lower end portion of the pump shaft 25. The lower end of the intermediate member D of the barrel is likewise preferably provided with spider 41 and guide bore for the shaft 25. Suitable impellers Gr are mounted on the pump shaft. In the construction shown, one impeller is mounted below the uppermost spider 37 and above the middle spider 41 and the other impeller is mounted on the shaft below said middle spider and above the lower spider 39. During pumping, the upward thrust on the pump shaft is resisted by the thrust bearing 15. The spider 37 has radial vanes which serve to guide the liquid against the uppermost impeller; and the spiders 40 and 41 have radial or helical vanes which operate to convert the rotary or centrifugal motion given to the liquid by the impellers into an axial direction of flow. The number of impellers are in pro ortion to the lift desired.

A suita le type of impelleiJ comprises a central hub 43 with helical vanes 44 that lit freely in the respective portions of the pump barrel in which they are mounted; said vanes being of the proper lead to impel liquid downwardly. The impellers are fixed to the pump or propeller shaft preferably by means of split hollow cone wedges 43EL that are forced into the impeller; hubs by nuts 43b threaded on the lower ends of said cone wedges. l

The bottom of the pump casing A is secured to a hollow reducing member I whose upper diameter is substantially the same as that of the pump casing and whose lower diameter is reduced to correspond with that of the pipe system connected therewith. In the construction illustrated, the reducingl member I has circumferential ribs or flanges at top and bottom perforated to accommodate bolts that extend through similar ribs at the bottom of the barrel casing and at the top of a quarter turn fitting J. This last mentioned ittin is equipped with a pedestal 45 that'is pre er- Ul ILUUEL al all main support of the pump.

Between the lower end of the pum vcasing A and the top of the reducing mem er I is clamped a ring 46 that fits around the lowermost shoulder portion of the extension E of the barrel ,casing and serves to close the annular space between the barrel of the pump and its casing. The operation of the construction hereinbefore described is as follows: The weight of the pump is supported by the pedestal 45 and the pump is steadied in its vertical position by the bracket 2 at the side thereof. The drive shaft 10, which is suitably connected to an electrical motor orother source of power,

' blades G force the liquid downwardly. As

' the inlet port 1 in the side of the pump casing the pump shaft 25 is hung from the propeller shaft, the entire weight of the moving parts is supported by the ball bearings on which the pro eller shaft is mounted. Assuming that A is in communication with the acid Ipot or tank and the elbow or litting J at the bottom of the pump casing communicates with said acid tank, the acid entering said inlet opening is propelled downwardly by the impeller vanes and out through the bottom of the casing whence it is forced back to the acid `pot or to such other point of delivery as may be desired. As the impeller vanes are arranged to drive the liquid downwardly, the reaction tends to lift the pump shaft 25 and the driving shaft- 10 from which it is suspended, and such tendency results in an easing of the thrust on the ball bearings which support said shafts.

t follows, therefore, that the greatest end thrust on said bearings is the downward thrust due to the dead weight of the pump lshaft and parts mounted thereon, when said shaft is stationary. When the shaft is in motion, the reaction of the impeller vanes against the liquid tends to offset said4 dead weight and appreciably reduce the downward thrust on said bearings. A In fact. under certain conditions, the initial downward thrust on' said bearings is reversed and the end thrust on the bearings is in an upward direction.

' It is noted that on account of the initialend thrust on the supporting bearings being eased or reversed in operation, the wear on said bearings is considerably reduced and the life thereof is greatly lengthened. It is also noted that on account of the acid being forced downwardly and delivered through the bot` tom of the casing, the danger of leakage at the top of the casing is minimized or eliminated and the usual stutling box is dispensed with. It is further noted that by reason of the sealin ring 46 at the bottom of the casing A all of t e liquid is forced to pass through the barrel of the pump and is delivered in y such manner that it cannot return.v

manufacture of sulphuric acid, it is obviously applicable to other uses.

What I claim is: l. A pump comprising a caslng having an inlet opening in the side thereof and a de-- livery opening in the bottom thereof, a barrel suspended from the top of said casing hav#A ing an inlet opening opposite the inlet opening of said casing and an out-let opening at the bottom thereof, and a shaft suspended inside of said barrel having impellers thereon adapted to force the liquid downwardly,said

barrel having a vertical rib on theinterior.

thereof extending across said opening opposite said shaft, said shaft being supported above said inlet openings by antifriction bearings adapted` to take care of vertical thrust and radialload, afnd below said inlet openings by bearings provided therefor lin said barrel.

2. A pump comprising a casing having an inlet opening inthe side thereof and a delivery opening in the bottom thereof, a barrel suspended from the top ,of said casing and having an inlet opening opposite the inlet opening of said casing and an outlet opening at the bottom thereof, a propeller shaft sus.-

pended inside of said barrel above the inlet opening thereon, said shaft being` supported by antifriction bearings adapted to take care of vertical thrust and radial load, a pump shaft suspended inside of said barrel from the lower end of said propeller shaft and having impellers thereon adapted to force the liquid downwardly, means for closing the aunular space between the upperend portion of said pump shaft and said barrel, said barrel being provided below the inlet opening thereon with bearings for supporting the lower end portion of saidpump shaft.

3.A pump comprising a casing having an inlet opening and a deliveryA opening located below said inlet opening, a barrel suspended inside of said casing from the top thereof, said barrel being provided opposite the inlet opening. of said casing with an in let opening and being provided adjacent to the discharge opening of said casing with a discharge opening, a shaft located .inside of said barrel and having impellers thereon adapted to force the liquid downwardly, and radial and end thrust bearings mounted on the upper end of said 'barrel for supporting said shaft therein, said casi-ng being provided in its top with a laterally extending bracket and at lits bottom with a supporting pedestal. i

4. A pump comprising a easing having an inlet opening in the side thereof and a delivery opening in the bottom thereof, a barrel suspended Afrom the top of said casing and having an linlet opening opposite the inlet e opening of said casing and an outlet opening at the bottom thereof, means for 'closing the annular space between said casing and said barrel at the lower end of the latter, a shaft suspended inside of said barrel and havingA impellers thereon adapted to force the liquid downwardly, means for closing the annular space between said shaft and said barrel at llO the upper end of the latter, and antifriction bearings mounted in said barrel above the means for .closing the space between said shaft vand the upper end of said barrel and adapted to take care of vertical thrust .and radial load.

5. A pump comprisng a casing having an inlet opening in the side thereof and a delivery opening in the bottom thereof, a barrel suspended from the top of said casing and having an inlet opening opposite the inlet opening of said casing and an outlet opening at the bottom thereof, means for closing the annular space between said casing and said barrel at the lower end of the latter, a shaft suspended inside of said barrell and having impellers thereon adapted to force the liquid downwardly, means for closing the annular space between said shaft and said barrel at 2U the upper end of the latter, and antifrietion bearings mounted in said barrel above the means for closing the space between said shaft and the upper end of said barrel and adapted to take care of vertical thrust and radial load, said barrel comprising a main body portion having an extension threaded thereon below the inlet opening therein and a similar extension threaded on the lower end of said first mentioned extension, the 3U lower ends of said main body portion and said extensions being provided with bearings for the lower end ot' said shaft.

Signed at St. Louis, Missouri, this 21 day of March 1929. :m JULUS W. GERHARD.

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