US1475676A - Centrifugal pump - Google Patents

Description

Nov. 27 192s. 1,475,676

- H. L. BELL ET AL CENTRIFUGAL PUMP Filed 001;. 24, 1921 5 Sheets-Sheet 1 INVENTOR fl: L. 38/),

' 1/. 6. Cay/son.

ATTORNEYS QMW 27 1923' H. L. BELL ET AL CENTRIFUG AL PUMP Filed Oct. 24, 1921 5 Sheets-Sheet Z Nov. 27 1923.

H. L. BELL ET AL CENTRIFUGAL PUMP Filed Oct. 24, 1921 5 Sheets-Sheet 5 md AM n 0/0 W m a m M? M E HH Nov. 27 1923. 1,475,676

H. L. BELL ET AL CENTRIFUGAL PUMP Filed Oct. 24. 1921 5 Sheets-Sheet 4 20.51 55 52 5 7827 25 AU MW" 72 6 0 if 2021 INVENTOR Biqfl. f9 xiii/6.2M.

Nov. 27, 1923.; 1,475,676

H. L. BELL ET AL CENTRIFUGAL PUMP Filed Oct. 24, 1921 5 Sheets-Sheet 5 x", 28 INVENTOR ff. Z. .Be//, 6. Coy/son. ATTORNEYS Patented Nov. 27, 1923.

UNITED STATESPATENT OFFICE.

HARRY LEWIS BELL AND HARRY GLEN GOULSON, OF WALLACE, IDAHO, ASSIGNORS T0 COUR DALENE HARDWARD & FOUNDRY 00., INCORPORATED, 013 WALLACE, IDAHO.

QENTRIFUGAL PUMP.

Application filed October 24, 1921.

To all whom it may concern:

Be it known that we, HARRY LEWIs BELL and HARRY GLEN CoULsoN, both citizens of the United States, residing at Wallace, in the county of Shoshone and State of Idaho, have invented a new and useful Centrifugal Pump, of whichthe following is a specification.

Our invention relates to improvements in single stage centrifugal pumps, and is designed more particularly for use in connection with ore concentrating, where the liquids pumped contain a percentage of more or less abrasive solids, such as sands and ore particles. -However, the pump is also well adapted for pumping clear water or other liquids.

The objects of our invention are, first, to

provide a construction. by which the wearing parts can very quickly be removed and replaced (as a corollary to this, a spare pump is not required, as in the ordinary installalion); second, to make the shape, proportions and material of the wearing parts such as to insure maximum life; third, to provide for changing the pump from right to left hand, or vice versa, by the change of only two parts; fourth, to make it possible for the discharge pipe to be led away in any direction through a range of about 250 degrees taken about the pump shaft as an axis; fifth, to render unnecessary, during long use under normal conditions, the replacing of shafts, glands or bearings; sixth, to reduce friction and power consumption to the minimum, thus increasing efiiciency; seventh, to reduce upkeep expense to the lowest figure by minimizing the consumption of lubricant and the number of part replacements necessary; and, eighth; to provide a neat, compact design which requires the smallest possible space for installation and operation.

The invention also resides in those details of construction, combination and arrangement of parts, all of which will be first fully described and then be specifically pointed out in the appended claims, reference being bad to the'accom'panying drawings in which: a

Figure 1 is a perspective view of the pump embodying the invention, the same being arranged with the discharge throat at the left.

Figure 2 is a perspective view of the Serial No. 509,942.

same with the suction head and the suction wearing plates removed.

Figure 3 is a perspective view of the same with the suction head the suction wearing plate, the impeller, the casing and the gland wearing plate dismantled.

Figure 4 is a central vertical longtitudinal section of the pump embodying the invention with parts positioned so that the discharge throat is located at the right, i. e. reversed from that shown in Figure 1.

Figure 5 is a cross section on the line 5 of Figure 4.

Figure 6 is a top plan view of the pump.

Figure 7 is a detailed elevation of the shaft and bearing unit withdrawn from the base bearing housing.

Figure 8 is a cross section on the line 8-8 of Figure 4.

Figure 9 is a cross section on the line 99 of Figure 4.

In the drawings in which like numerals of reference designate like parts in all of the figures, 1 represents the base. Formed integral with the base is the circular disk or head 13 which has disposed about its periphery eight slotted bolt head lugs 17. At the center of the head 13 is a circular projection or boss- 14. The circular projection or boss 14 is bored out to form a stuffing box 15. At the end of the base 1 opposite the head 13 is formed the barrel or housing 3 for the bearings, the same being provided with a drainage hole 12 which serves to prevent the accumulation of used grease inside the housing: Formed as an integral part of the base are two casing supports or lugs 2. The base is also provided with suitable hold down bolt lugs 70 as shown.

The pump enclosure proper is made of parts having great wearing resisting qualities and consist of the annular channeled casing 40, which is also extended to form the discharge throat 58, and the gland and suction wearing plates'44 and 46 respectively, which by means of the flanges and 47 are held in a position such as to provide rotating clearance space for the impeller 49. The casing 40 has its weight supported on the lugs 2 of the base. The assembly, casing and wearing plates, are held in place between.

the head 13 and the suction head 50 by means of four casing bolts 71 passing through the slotted- lugs 17 and 51 of the suction head plate and base head plate 13. It will be noted that the suction head 50 has but four slotted lugs 51; while the base head 13 has eight slotted lugs 17. The bolts are disposed in the four slotted lugs of the suction head and in four of the eight slotted lugs of the base head. The four intermediate lugs of the base head are used when the discharge is directed at certain angles other than the position shown on the drawings. The pump enclosure is made air and water tight by means of two rings of packing 43 which are located in the grooves 42 in the sides of the casing.

The suction head has formed u n it a neck 52 provided with a slotted ange 53 to which is attached the slotted suction flange 56 by the four bolts 57. The suction ipe line 63 coming to the pump is screwed into the flange 56. The removable filler flange is placed between the flanges 53 and 56 for the purpose of providing necessary clearance when removing the suction head, wearing plates, casing and impeller.

4 7 Suitable packing disks 54 are provided for the usual urposes.

The disc rge pipe line 64 is screwed into the slotted flange 61 which is in turn bolted to the slotted flange 59 of the casing throat by four bolts 62, a suitable packing disk being interposed for theusual purposes.

The impeller drive shaft 20- is mounted upon the radial and thrust bearing 34 and the radial ball bearing 27. The inner race of the bearin 27 is clamped by the integral collar 22 an the bearing lock nut 29, which is screwed u on the threaded portion 21 of the shaft. e lock nut 29 is separated at 30\ and provided with a locking screw 31 so as to lock the nut on the threaded part of the shaft after the desired adjustment has been made. The outer race of the ball bearing 27 has space upon each side to allow slight endwis'e adjustments of the shaft.

The pulley 36 rotates the shaft by means of a feather key 37. The ulley hub and inner race of the radial an thrust bearin 34 are held together in place on the sha between the extended sleeve adjusting nut 32 and the outer adjusting nut 39, both nuts being screwed upon the shaft. I A'thrust collar and grease retainer 33 rests against the shoulder 4 of the housing. The outer race of the bea 34 is held between the thrust collar 33 an the end plate 18, which is in turn secured to the end of the housin by three cap screws 19. The felt washers% and 35 serve to exclude dirt from and retain grease in the bearings.

Lubrication for the bearings is introduced through the two grease cups 8 and 10. The grease flows from the cup 8 through the a duct 7 to the end of the bearing housing adjacent to the end late 18 from which it flows into the end 0 the housing through the bearing 34. The

grease retainer 28 is held in place by two set screws 65.

The pulley 36 has offset webs and hub in order to bring the center line of the belt ulley nearly over the center line of the aring 34. The offset pulley construction is also used for the purpose of getting as reat a distance as may be between the bearing 27 and 34, and at the same time kee ing the overall length of the umfi as sma as ssible. The pulle is 1550 eld in place y a set screw 38 an the nut 39.

The impeller 49 is threaded on the threaded end 48 of the shaft as shown.

When it is desired to slightly adjust the shaft endwise, the plug 11 is removed and a round pin used through the hole in the housing into one of the two holes 72 of the ad ustin nut .32. Then, after loosening the outer a justing nut 39, the pulley is rotated in one di rection or the other, thus screwing the shaft to right or left, after which the outer nut is re-tightened.

The integral extended hub 73 of the impeller is screwed upon the end of the shaft 20 up tight against the shoulder 24. The hub also presents the surface 74 upon which the gland cking 68 rests. The g and packing- 68 is ept tight by the gland 25 which is held in by the two gland studs and nuts 26. Included between the rings of packing is a water cage 69 which admits clear water under pressure from the inlet 16 to the surface 74 of the hub. The water serves as a as a wrench is inserted lubricant to the rotating hub as well as forcing its way along the'hub toward the impe le r, and out past the bevel projection 75,

thus excluding grit from the stufling box. This clear water also serves as a seal to prevent the admission of air into the pump enclosure.

The shoulder and water sling 23 serves to arrest and to throw oil by centrifugal force any water that may cree alongthe shaft from the gland packing,t us preventhousing. e

The base bearing housing isprovided with a recess 5-to receive the bearing 27 and the grease retainer 28 and is providedwith a hole 9 by means of which the grease from the on 10 may be delivered to the bearin 27. The casing 40 has counter bores 41 at its sides in which the flanges 45 and 47 of the wearing plates fit. 66 designates spreader screws and 67 designates the filler flange handles, the purposes of which will presently appear.

The im ller, as well as the casing and wearing p ates, are made of hard wear resisting metal, and the blades are shaped with the proper curve and taper to do mostefficient pumpin The pump be ins complete in operating ing the water from entering the hearing I position, the preceedure of removing wearing parts is as follows: The nuts onthe four suction flange bolts are loosened sufficiently to remove the bolts from their slots, then the two spreading screws 66 are screwed through the flange 53 out against the suction flange 56 forcing it slightly away from the tiller flange 55. The filler flange, being thus loosened is taken by its handles and removed, following which the spreading screws are backed out enough to give full clearance space between the flanges 53 and 56. Next the nuts of easing bolts are loosened and the four casing bolts are removed from their slots. The suction head and suction wearing plates being released, are taken out. The casing, impeller and gland wearing plates may now be inspected. To proceed further with the dismantling, the four discharge flange bolts are loosened and removed, whereupon the casing is freed and may be taken away. Next, the nuts of gland studs 26 are loosened to relieve packing pressure. Then, the pulley 36 being held to prevent the shaft 20 from rotating,'the impeller 49 is unscrewed from the shaft. ing plate 44 is slipped off the projection 14 u on which it rests when not being held in p ace by the casing. To re-assemble the pump, the wearing parts, suction head, filler flange and the twelve bolts are replaced in the exact reverse order in which they were removed. 1

The ring packings 43 are retained in the annular grooves of the casing until the casing is worn out when they are transferred to a new one.

To remove the shaft and bearing assembly, it is first necessary to take off the suction head and suction wearing plate so that the impeller may be unscrewed from the shaft. Then the pulley being held against rotation the outer nut 39 is unscrewed and after loosening the set screw 38, the pulley and key are also removed. Next, the three cap screws which retain the end plate 18 in place and the end plate are slipped 0d the shaft. Finally the two set screws are backed out sufiiciently to free the grease retainer 28, whereupon the shaft and bearing assembly may be pulled out of the housing. see Figure I 7. These parts are also replaced in the exact reverse order of their removal. To change the pump from right to left hand, for instance. a different impeller, having left hand curved blades and left hand screw threads in Y the hub and a different shaft having left hand impeller screw threads mustjbe put into "place. The casing, being reversible is simply turned about so that the'face which was next to the suction head is now next to the gland or base head. All other parts are the same forcither hand.

From the foregoing it will be observed Finally, wear-' that with our construction of the pump the wearing plates contain no nuts, holes or bolt heads from which wear often starts, but are held in place by flanges at the rim. Furthermore, to offset the wear which is usually greatest in one quarter of the pump, these plates can be rotated from one position to another until completely Worn out. At tachment of the impeller to the shaft is made by means of screw threads. which is, with out doubt. the best construction for holding the impeller securely, as well as providing for its quick removal and replacement.

The assembly of the casing, wearing plates and suction head is held in place on the main base casting by four bolts arranged in slots, thus permitting it to be taken apart by simply backing up four nuts a few turns, and removing bolts from slots. Likewise the suc lion and discharge cozmections can each be taken apart by loosening four bolts. 'Wearing parts can be inspected, removed or replaced without moving the pump base, piping or suction box from their normal positionl Hence, replacement of parts in this construction of pump is merely a question of minutes as against a matter of hours in many other types oreven of days in those cases where linings are cemented in place. Furthermore it is not necessary to have spare pumps on hand since replacements can be made in a pump as quickly as a change of complete pumps. It will also be noted that with our construction of parts the discharge can be taken off in an upward direction,

either horizontaldirection or at intermediate angles. The casing is reversible and the wearing plates are interchangeable thus making it possible to convert a pump from right to left hand or vice versa by simply changing the shaft and impeller thereby eliminating the necessity of carrying a large number of spare parts where both right and left hand pumps are in use.

It will also be noted that the operating and upkeep cost of our pump is low primarily because of the use of ball bearings which insures minimum power consumption. lBa-ll bearings also effect a marked saving in lubricants and eliminate replacements of shafts, glands and brass or babbitted bearings and bushings.

From the foregoing description taken in connection with the accompanying drawings, it is thoughtthat the complete construction, operation and advantages of our invention will be clear to those skilled in the art and while we have shown and described the preferred embodiment of our invention, we do not desire to be understood as limiting ourselves to the precise details shown and described in the drawings as changes in the details of construction and arrangement of parts may be made to suit the requirements,

of particular practice without departing from the spirit of the invention or the scope of the appended claims.

What we claim is: I

1. In centrifugal pumps, a base having a bearing housing and a head," a shaft journalled in bearings in said housing and projecting through an opening in said head, a gland packing carried by said head, a suction head having a water inlet, a casing interposed between said heads and having a water chamber and a discharge throat, gland and suction wear plates held between said heads and casing and spaced apart to leave an impeller chamber in communication with said water chamber and said Water inlet, an impeller on said shaft within said impeller chamber, and means to hold said heads, said casing, and said wear plates in position.

2. In centrifugal pumps, a base having a bearing housing and-a head, a shaft jour nalled in hearings in said housing and projecting through an opening in said head, a gland packing carried by said head, a sac tion head hav ng a water inlet, a casing interposed between said heads and having water chamber and a discharge throat, gland and, suction wear plates rotatably adjustable held between said heads and casing and spaced apart to leave an impeller chamber in communication with said water chamber and said water inlet, an impeller on said shaft within said impeller chamber,

and means to hold said heads, said casing and said wear lates in position.

3. In centri ugal pumps, a base having a bearing housing and a head, a shaft journalled in bearings in said housing and projecting through an opening in said head, a gland packing carried by said head, a suction head having a water inlet, a casing interposed between said heads and having a water chamber and a discharge throat, gland and suction wear plates held between said heads and casing and spaced apart to leave an impeller chamber in communication with said water chamber and said water inlet, an impeller on said shaft within said impeller chamber, and means to hold said heads said casin and said wear plates in position, and pac ing rings carried between said casing and said heads.

4. In centrifugal pumps, a base, a head, an impeller shaft passing through a hole in said head, a packing gland onsaid head, a suction head having an inlet, an annular casing having a water chamber and a discharge throat located between said heads, means for securing said heads together with said casing between them, said means having provisions whereby said casing may be adjusted around its axis to locate said discharge throat' at any desired angle, gland and suction wear plates held between said casing and said heads, and an impeller on said shaft between said wear plates and charge throat at any desired angle, gland and suction wear plates held between said casing and said heads, an impeller on said I shaft between said wear plates and encompassed by said casing, said casing having wear-plate-flan e recesses and said wear plates having anges to lie in said recesses,

said flanges and recesses being circular whereby said plates may be rotated about the axis of the impeller shaft to take up wear.

' 6. In centrifugal pumps, an annular casing having a discharge throat, wear plates cooperating with said casing, heads between which said casing and wear plates are held,

said casing being adjustable around the axis of said wear plates to locate the discharge throat of said casing at different angles, and a shaft with impeller cooperative with said casing and wear plates, one of said wear plates and one of said heads having an inlet.

7. In centrifugal pumps, a casin having 1 a discharge throat, heads between w ich sai casing is held, said casing being adjustable around its axis to locate the discharge throat thereof at different angles, a shaft with impeller cooperative with said casing and heads, one of said heads having a flanged inlet neck, a fixed inlet duct flange, connections between said duct flange and said neck flan and including a filler flange.

8. In centrifugal'pumps, a casing having a discharge throat, heads between which said casing is held, said casing being adjustable along its axis to locate the discharge throat thereof at different angles, a shaft with impeller cooperative with said casing heads, one of said heads having a flanged inlet neck, a fixed inlet duct flange, connections between said duct flange and said neck.flange and including a filler flange, and means carried by one of said flanges, other than the filler flange, and engagin the opposite flange, other than the filler flange,

to spread the same apart andpermit removal and replacement of said filler flange.

9. In centrifugal pumps, a fixed base, pump elements mounted thereon which include a suction head having a flanged neck a duct flange and a filler flange between said duct flange and said neckflange, bolts and nuts securing said flanges together, and 7 means to spread said head flange and'duct flange apart when said bolts and nuts are loosened whereby said filler flange may be removed and replaced.

10. In centrifugal pumps, a base, a glan head carried by the base, a suction head,

' bolt and nut connections for holding said lid lid

heads together, a casing located between said heads and held in place thereby, a pair of wear plates having tongue and groove connection with said casing and located between said heads, one of said wear plates having a flat surface which opposes the other wear plate while the other wear plate has its opposing surface dished, said tongue and groove connection being symmetrical whereby said casing may be reversed in position between said heads without reversing said wear plates, an impeller shaft journalled in suitable bearings and projecting through the first mentioned head, an impeller located between said wear plates and mounted on said shaft, said casing having a throat, one of said heads and the adjacent wear plate having a Water passage into the impeller chamber, substantially as shown and described.

11. In centrifugal pumps, a base having a bearing housing, a pump shaft journalled in bearings in said housing, a head formed integrally with said base and having a gland with packing into which said shaft projects,

said head having slotted radial lugs, an annular casing having a water receiving cham- 1 bar and a discharge throat approximately tangential to said chamber, a wear plate interposed between said casing and said head, a suction head with an inlet duct, a suction wear plate with inlet port located between said suction head and said casing, said wear plates being spaced'apart to leave a chamber, an impeller on said shaft within said chamber, said suction head having slotted lu and nuts and bolts carried by the slotte lugs of said head plates to clamp said casing and wear plates in position.

12. In centrifugal pumps, a base havin a bearing housing, a pump shaft journall in bearings in said housing, a head formed integrally with said base and having a gland with packing into which said shaft projects, said head having slotted radial lugs, an annular casing having a water receiving chamber and a dischar ethroat approximately tangential to said 0 iamber, a wear plate interposed between said casing and said head, a suction head with an inlet duct, a'suction wear plate: with inlet port located between said suction and said "casing, said wear plates being spaced apart to leave a chamher, an impeller on said shaft within said chamber, said suction head having slotted lugs and nuts and bolts carried by the slotted lugs of said head said casing and wear plates 1n position, said lates to clamp base having lugs on which said casing may rest.

13. In centrifugal pumps wherein is provided a rotary shaft and impeller, bearings for said shaft, a housing for said impeller including a head having a packing chamber and a gland cooperating therewith through which said shaft projects, the end of said shaft being threaded and said impeller having a hub threaded on to the end of said shaft and lying in said packing chamber, gland packing ring units in said packing chamber and a water cage located between said units and means for leading high pressure water to said cage.

14. In centrifugal pumps, a base having a bearing housing and a head, the latter lying normal to the axis of said bearing housing, a shaft journalled in hearings in said bearing housing, said bearing housing having an opening through which said shaft projects and said head having an opening into which said shaft projects and said head having an enlargement at said opening provided with a packing chamber, a gland cooperating with said packing chamber, gland packing in said chamber, means for leading high pressure water to said packing, an impeller having a hub threaded onto the end of said shaft and located within said packing chamber whereby said packing will engage said hub to effect an air tight seal.-

15. In centrifugal pumps, a base having a bearing housing and a head, the latter lying normal to the axis of said bearing housing, a shaft journalled in bearings in said bearing housing, said bearing housing having an opening through which said shaft projects and said head having an opening into which said shaft projects, said head having an enlargement at said opening provided with a packing chamber, a gland co -said base, said head having a boss chambered to provide a packing recess, a gland secured to said head to enter said recess, said head having a water duct leading into said recess,

said base having lugs, a second head, a casing located between said head and restlng on said lugs, bolts securing said heads and casing in place, packing rings between the sides of said casing and said heads, one of said heads having a water inlet passage, said casing having a water receiving chamber and a water discharge throat, a gland wear plate apertured to fit over said boss of said first mentioned head, a suction wear plate having a water passage, said wear plates being located between said heads and spaced apart to form a chamber, an impeller located within said chamber and havin a hub projecting into the boss of said head, a packing within said packing recess of said head and engaging said impeller hub to seal the same agalnst assage of air, a housing formed with said base and held with its axis lying normal to the plane of rotation of said impeller, a shaft passing through said housing and said gland and connected with said impeller hub, said shaft where it passes out of said housing having a water throw-off ring, radial ball bearings and radial ball and thrust hearings in said casing for said shaft and removable with said shaft from said casing as a unit, and a pulley on said shaft overhanging said housing.

17. In centrifugal pumps, a shaft and an impeller, an annular casing with wear chamber, and discharge throat encircling said impeller, wear plates at each side of said impeller, and heads with means for securing the same. together, said casing and wear plates being held between said heads,

18. In centrifugal pumps, a shaft and an impeller, an annular casing with wear chamber and discharge throat encirclin said impeller, wear plates at each side 0 said immore peller, and heads "with means for securing the same to ther, said casing and wear plates being eld between said'heads, said casing bein reversible as to position between said eads for a left or right handed pump.

19. In centrifugal pumps, a shaft and an impeller, an annular casing with wear chamber and discharge throat encirclin said impeller, wear plates at each side 0' said impeller, and heads with means for securing the same together, said casing and wear plates being held between said heads, said wear plates and said casing having overlapping portions, the contour of which is such that said wear plates may be turned about the axis of the pump shaft to take up wear.

20. In centrifu al pumps, a shaft and an impeller, an annular casing with wear chamber and discharge throat encirclin said impeller, wear plates at each side of said impeller, and heads with means for securing the same together, said casing and wear plates being held between said heads, said casing being reversible as to osition between said heads for a left or right handed pump, said wear plates and "said casing having overlap in portions, the contour of which is suc t at said wear plates ma be turned about the axis of the pump she to take up wear.

HARRY LEWIS BELL.

HARRY GLEN COULSON.

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