US1727703A - Centrifugal pump - Google Patents

Description

S p 1929- F. E. HAUSE ET AL 1 ,727,703

CENTRIFUGAL PUMP Filed May 28, 1928 2 Sheets-Shea? 1 Sept. 10, 1929. F. E. HAUSE ETAL 1,727,703

' CENTRIEUGAL PUMP Filed May 28, 1928 2 Sheets-Sheet 2 Patented Sept. 10, 1929.

UNITED STATES PATENT OFFICE.

FRED E. HAUSE, F ASBURY PARK, AND JOHN ZOLLINGER, OF OAKHURS'I, NEW

JERSEY, ASSIGNORS OF ONE-HALF TO NEW JERSEY SAND AND GRAVEL COM- PANY, OF SPRING LAKE, NEW JERSEY, CORPORATION OF NEW JERSEY.

CENTRIFUGAL PUMP.

Application filed May 28, 1928. Serial No. 261,034.

' This invention relates to centrifugalpumps.

One object of this invention is to provide a device of the character described which is of improved construction to particularly resist the wear that is caused by sand, gravel, or other foreign substances that might enter the pump. 7 Another object of this invention is to proio vide a device of the nature set forth wherein an improved sectional construction permits rapid and inexpensive replacement of worn parts in the field. I i A further object of this invention-is the is provision of a device of the type mentioned, comprising an improved thrust bearing that can be readjusted with facility and accuracy,

and which is simple and foolproof in con-.

struction, and applicable, nevertheless, to mm chines of varying kinds.

Still another object of this invention is to furnish a device of.the species alluded to in which an improved water circulatory system safeguards the bearing of the rotor against 2 wear by grit and the like.

Still a further object of the invention is to produce a device of the class mentioned having an improved wear resisting bearing and lubricating system therefor.

0 Other objects and advantages of the invention will become apparent as the specification proceeds.

' With the aforesaid objects in view, the invention consists in the novel combinations and arrangements of parts hereinafter described in their preferred embodiments, pointed out in the subjoined claims, and illustrated on the annexed drawing, wherein like parts are designated by the same reference 40 characters throughout the several views.

In the drawing: Figure 1 is a vertical section of an embodiment of the invention.

Fig. 2 is a'sectional view taken on line 22 of Fig. 1. 0

Fig. 3 is an enlarged vertical section with parts broken away showing a thrust bearing made according to our invention.

Fig. 4. is a top view of the thrust bearing 59 shown in Fig. 3, but removed from the races.

- the same may be incorporated in several different construct1ons. L The accompanying drawing, therefore, is submitted merel as showing the preferred exemplification o the invention.

Generally described, the invention provides a sand and gravel pump which cuts down to a minimum the replacement cost of parts, thus making the mining, of sand, gravel, or other wearing material more profitable. The pump is of the centrifugal type, and since the sand and gravel assmg through the pump is of a h1ghly a rasive character, the pump is made in sections to permit the renewal of such parts as receive the most wear and abuse. These sections are preferably made of a high grade steel, and enclosing the same is a pump housing that may be made of cast iron, or other inexpensive material. The said housing is split above the center to provide an opening throu h which the sections may be replaced, but without disturbing the bearing. To re duce the machining that might be necessary as between these sections and the housing, contact is provided only at predetermined spaced points. Bolts to secure the sections to the housing are reduced to a minimum through interlocking coaction between the sections, whereby the latter are thus anchored in place.

To prevent grit from depositin in'the bearing, and also at the ad acent ub and housing plate of the pump, with the consequent cutting loose and destruction of these parts due to the churning of the abrasive material, guide means properly direct -a stream of water to'flush these several parts- The thrustbearing serves to keep the impeller in the central plane of the pump, the side clearance being evenly distributed to prevent excessive wear on the suction side of the impeller. This thrust bearing includes a pair of split resilient sleeves, and a pair of clamps to secure the same to the impeller shaft. Keys engaging the sleevesand clamps retain the same in proper clamping co-operation. Through the use of taper pins, coacting between the clainps and the keys, the sleeves are set in desired adjusted position.

Referring in detail to the drawings, 10 denotes a device embodying the invention. The same comprises a centrifugal pump 11, adapted for use in mining sand, gravel, and other hard materials. A thrust hearing 12 co-opera'tes with the pump 11, and is mounted therewith upon a base 13.

The pump 11 includes a housing 14 having an inlet connection 15. The latter is formed as an integral part of the suction disc 16. The opposite wall of the pump consists of the. hub disc 17. Interconnecting these discs is a peripheral casing member 18 having a discharge opening 19.. Q

In the upper portion of the housing is an opening 20 of relatively considerable size, for a purpose hereinafter described. Closing the said opening is a cover 21, whichprovides a continuous uniform structure with the other parts of the housing. This cover is secured to the housing by any suitable.

is journaled in a bearing 25 secured to a hub 4 26 of the disc 17 The said impeller is preferably made of manganese steel to resist the wear of abrasive mater al, such as sand or gravel.

The housing is made of cast iron, or other similar inexpensive material, and is protected interiorly against the wearing action of the abrasive material by steel liners. These may be made of a carbon or alloy steel, and. are constructed in sections to be readily replaceable, preferably through the opening r 20, on removing the cover 21.

The sections aforesaid comprise disc liners 27, 28 extending along the suction and hub discs respectively. The liners 27 28 are preferably made of a carbon steel. Held in place by disc liner 27 is a suction sleeve 29, which communicates between the inlet 15 and the interior of the impeller 23. This sleeve is of referred to so as to partially overlie the impeller. They are preferably made of manganese steel. Ring flanges 34 extend laterally from the said liners into engagement between the aforesaid liners and the main casing. To secure the members 33 to the said casing, bolts 35 may be provided, which may likewise engagev the side walls 16, 17 of easing with circular portion 18 thereof.

Segmental liners 36 to 41 extend along the internal surface of the member 18, and provide the track in which the heavy solid particles move with a high velocity. Due to the high degree of wear on these liners, they are made of manganese steel. To require the minimum amount of machining, the liners 36 to 41 have three pdint contact with the pump casing, namely, at 42, 43 and 44. The liners 1 the same to the pump casing, and to he, never-' theless, retained reliably in position. In aid of this object, the said liners. may have interlocking engagement with each other, as, for instance, at 45. The interlock here provided consists of a projecting portion 46 of liner 41 engaging a similar portion 47,

of liner 36, with the formation, nevertheless, of a uniform interiorsurface. The uper liner 39 is or 21.

In assembling the pump, sleeve liner 36 is first placed into the discharge opening 19, and then the liner 41 is dropped intoplace through the opening 20 to engage the first mentioned liner. Thereafter the remaining segmental liners are placed in position to complete the circle. It will be appreciated that by making the opening 22 as large .as possible, the use of a relatively long linin opening is above the center of the pump so that the bearingof the pump is not disturbed. Finally the cover of-the pump is applied and made tight with a rubber gasket 48.

To prevent accumulation of sand or grit in the bearing or hub, the shaft 24 is bored centrally at 50, the end of the bore being plugged at' 51. A stream of water under pressure from a forced feed connection 53 enters the hollow shaft through radially.

drilled holes 52 at the outer end of the hub and shaft, there being other radial holes, hereinafter described, to allow the water to discharge from the shaftin the form of a spray at the inner end of the bafiie plate. The bearing 25 is thus lubricatedby water, this clamped in placeby the cova segment is possible. Nevertheless, the said being facilitated particularly by novel bearing construction now to be described.

The bearing com rises a cutless hearing member 54. This is made preferably of rubber and has been fproved highly efliclent, eliminating the need or oil lubrication. The bearing also includes packing 55 and a gland 56 therefor. v

Within the hub 26 is a baflie plate 57, which is of frusto-conical form, and in alinement with the said shaft. The said baflie plate is preferably made of manganese steel. The smaller end of the baffle plate is in proximity to the bearing, while the larger end thereof is flanged outward at 58 to engage within a recess in which the flange 58 is locked by the disc 28.

The interior of the baffle plate is in communication with the clearance space between the impeller and the adjacent stationary portions of the pump. The hub 60 of the impeller, which engages the shaft 2 1, may also extend into the baffle plate, and this forms a conical annular space 61 for a purpose now to be described.

A plurality of radial openings 62, preferably three in number, communicate with the bore to discharge the water into the bail'le plate at the smaller end thereof. This water, due to the rotation of the shaft, provides a spray, which effectively flushes the spaces between the impeller and the disc 28. Likewise, sand and other solid material are prevented from lodging in the hub 26 and the bearing. Accordingly, the harmful effects heretofore obtained, causing, forexample, bolts 63 to be sheared by the abrasive material, due to the churning thereof, with the consequent destruction of the hub and bearing are eliminated. This water also pre-' vents the pump from losing its prime. It

. cessed at 75 for a purpose hereinafter set' will be apparent that. water may also be let into the pump at the suction side.

To retain the impeller in the true central plane of the pump and counteract the tendency for the. impeller to move toward the right owing to the effect of suction thereon, the thrust bearing 12 is employed. This comprises a support 64 which forms an oil box surmounted by a cover 65. Extending between the pump and the frame 64 is a stabilizer- 66. By this improved thrust. bearing, no collars need be formed on the shaft. The thrust bearing includes a pair of races 67 in' the end wall 68 of the oil box.

Adjacent to these races, are felt washers 69, retained by washers70.

Taking around the shaft are a pair of clamping sleeves 71. These comprise the strong rigid collar ortions 82, that seat within the inner rings 3 of the races. The said collars are flanged at 74 to abut laterally against the rings 73. The flanges 74 are reforth. The said sleeves 71 include also a comparatively thin walled sleeve portion 76,-

71 is bored to receive the shaft with a slight clearance. The member 71 may, however, be.

made with the portions 72 and 76 separate from one another.

Clamps 78 have individual co-operation with the sleeves 71, and scrve to secure the latter to the shaft. Each clamp 78 comprises a plurality of separate members 79 which have side and end re-enforcing flanges 80, 81, re-- spectively. With a flange 81 positioned against the flange74 of the sleeve, the side flanges 80 are bolted to ether at 82.

To retain the clamp 78 in proper angular relation to its sleeve 71, the clamp is formed with a pluralit of ridges 83, which arerecessed longitudinally at 84:, to aline with the openings in the flange 74. On placing a key 85 into these alined openings, any relative turning is prevented, so that clamp 78 will always act in a direction to flex thesleeve portion 76.

Preferably, the keys 85 extend into engagement with the aforesaid parts at both ends of the thrust bearing. These keys are utilized as a means for initially driving the sleeves 71 apart .and into snug engagement and holes 87 in the keys 85. Taper pins 88 are then forced into the holes 86 and 87, these being initially out of alinement so as to cause the keys 85 to drive the clamps 78 and in turn the sleeves 71 apart as aforesaid. These keys can be replaced at any time by others, having holes differently drilled.

It is thus seen that we have provided a device which fulfills the several objects. of the invention and is well adapted to meet the conditions of practical use.

We claim 1. A device of the character set forth, including a centrifugal pump comprising a housing, an impeller therein, the housing including a cover wholly at one side of the axis of the pump, and sectional replaceable liners in the housing to protect the same, said liners being removable from the housing on removing said cover, said liners including separate peripheral and side liners, said peripheral liners being replaceable through the opening provided on removing said cover.

between the sides of the impeller and the side walls of the housing, side liners extendin along the side walls of the housing, an around the peripheries of the discs, and split r therein, discs I 4- memos 'shell liners extending along the inner circumference of the housing and around the side liners, said housing having an opening to one side of the axis thereof for replacement of the shell liners, and a cover for said opening.

' 3. A device of the character set forth, including .a centrifugal pump comprising a housing, an impeller therein, a shaft for the impeller, a hub for the shaft, a bafie between the hub and the impeller to protect the former, said shaft being hollow and having radial holes therein at the hub and at a portion of the shaft on that side of the bafile nearest to the impeller, said holes communi-.

eating with the hollow in the shaft, and means to supply Water through the hub to the hollow shaft, the water entering and being discharged through said radial holes in the form of a spray along the bafiie.

4:. A centrifugal pump, including a housing having an outlet andan opening remote therefrom, said opening being wholly on one side of the axis of the housing, a cover for said opening, an impeller in the housing,

and peripheral sectional liners in the housing adapted to be inserted through said opening, one of said liners extending into said outlet, and being removable therethrough, the last mentioned liner having interlocking engagement with an adjacent liner to be retained in the housing.

\ 5. A centrifugal pump including a housing, a shaft through the housing, a hubfor the shaft, an impeller in the housing on said v shaft, a conical bathe in the hub and through which the shaft passes, the large end of the baffle being in proximity to the impeller and in close contact with the wall of the housing, the other end of the baffle fitting comparatively closely about the shaft, the shaft having a hole in the bafile to discharge a liquid along the concave wall thereof to prevent infiltration'of grit into the hub.

In testimony whereof We afiix our signatures.

FRED. E. USE. JOHN ZOLLINGER.

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