US1254156A - Fluid pump, turbine, and the like. - Google Patents

Description

R. C. PARSONSr FLUID PUMP, TURBINE, AND THE LIKE.

APPLICATION FILED DEC. I8 I9I5.

Patented Jan. 22, 1918.

2 SHEETS-SHEET I.

R. C. PARS'ON'SJ" FLUID PUMP, TURBINE, AND THE LIKE.

APPLICATlON FILED DEC. ls, 1915. l 1,254,156. Patented Jan. 22,1918.

2 SHEETS-SHEET 2.

RICHARD c. rAnsoNs, or LoNnoN, ENGLAND.

FLUID PUMP, TURBINE, AND. THE LIKE.

nasales.

Specification of Letters Patent. y

Patented aan. ea, rais.

Application led December 18, 1915. Serial No. 67,521#

To all whom t may concern:

Be it known that T, The Honorable RICH- ARD CLERE PARSONS, M. A., M. InstfC. E., a'

subject of the King of Great Britain and lreland, and residing at London, S. W., England, have invented certain new and useful Improvements in and Relating to Fluid Pumps, Turbines, and the like, of which the following is a specilication.

This invention relates to improvements in centrifugal pumps, turbine type fluid pumps, or water turbines, and the like, of the type in which resilient blades are employed;

When centrifugal pumps, for example, are employed for pumping fluid containing sand or other abrasive matters, it is found that serious abrasion of the internal parts takes place, with resulting great reduction `of efficiency, besides giving rise to frequent and costly repairs; and when such pumps are used for pumping Huids containing fibrous matter or the like, such matter becomes wedged between the impellerv and the surfaces against which it-revolves, frequently causing stoppage of the pump.

` The object of the present invention is to overcome these difculties.

The invention consists in an improved form of pump in which the vanes of the impeller are constructed entirely of resilient material thel face against which it contacts also being constructed of resilient material, while the passages through which the fluid passes are of such form that with the vane resiliency solid, fibrous, andother matters will 'pass through the pump readily and without blocking it.

1The invention also consists in the improved constructions of pumps hereinafter described.-

The invention is applicable to centrifugal umps' of any of the well known forms, having unshrouded impellers with either single or double inlet.

By the use of the resilient impellers, and suitable grooves vin the surface ofthe casing against which they contact, according to the invention, fibrous and the other solid matters are readily passed through the Owing to the resiliency of the aided by the grooves in the face of the casing, these are enabled to overrun any fibrous and between them and the casing, the revolution 39 Victoriastreet,

' portion by bolts jblades are formed on the face of the impeller. The

other matters which may lodgeof the succeeding resilient blades giving successive impulses to the lodged matter until it is finally 'expelled from the pump. The wear of the pump by sand or other abrasive matter is greatly reduced by the use of the rubber or like coating, it having been found by experiment that` rubber of the quality specially selected is, under the conditions eX- isting, less liable to abrasion thanmetal.

-vReferring* to the accompanying drawings Figure 1 isa transverse section of one form of pump constructed according to the invention; p f

Figs. 2, 8 Vand a being similar views ofv modified forms.

Fig. 5 is a front view of the pump shown in Fig. l, the front portion of the` casing being removed. Fig. 6 is a view casing, as seen from the interior of the pump, showing the grooves in the face.

Tn carrying the invention into eect, according to thefform shown in Fig.y l, which represents a centrifugal pump of the single inlet type, the pump chamber is constructed of rtwo parts, a, respectively. The back portion a contains the bearing, which is lubricated with a stream of water, and also an air pipe for balancing purposes and in which works the spindle c carrying the impeller d., and attached to which is the necessary thrust bearing. This part also contains the outer or volute chamber e of the pump, and the discharge pipe oroutlet f. The volute chamber e is closed at the front by the part b, which is connected to the back passing through flanges on the two parts. The center of the portion?) of the pump is provided with a circular ap-z erture g, which serves as the inlet. The impeller is constructed in the following manner z-The center is constructed of metal which is suitably attached to the spindle upon which it revolves.l The front face of this metal is'provided. with deep grooves, following the line of the usual impeller blades, and by the use of a suitable mold impeller hof the usual shape, but of rubber,

rubber is arranged to fill the grooves in the front face of the impeller, these grooves being preferably of dovetail form, so as to secure the rubber to the metal, and preferably considerably wider than the thickness of the blades, so that a heavy rubber root is of the front portion of the formed, so as toy allow bending of the impeller blades without overstressing. The

rubber of which these vanes. are formed is facel of the part b adjacent to the impeller blades, these grooves being of the form illustrated in Fig. 6, and continued some distance along the inlet pipe g. These grooves assist in the removal of solid particles which are swept into the grooves and then along them toward the circumference by the rotation of the impeller blades.

In the form of the invention illustrated in Fig. 2, which is suitable for pumping fluids containing abrasive material, the back cas# ing of the pump a contains only one half of the volute chamber e, and of the outlet pipe f, theA other half of each of these being formedv by the front portion Z, so that these twopo'i'tions of the front consist of simple castings With-out cores. The central opening of the part Z of the casing is of slightly greater diameteil than the impeller d, so that the latter can be 'withdrawn through it.

This .opening is closed inby Aa casting b having a central inlet g. The whole of the interior surface of these parts, and the front and rear surfaces and circumference of the impeller, are so arranged that they can be easily rubbered over such area as may be required for any special duty, the rubber m being simply molded onto the several parts, as illustrated. The vanes for balancing purposesat the back of the impeller may also be made of rubber if desired.

In therform, of the invention shown in Fig. 3,'which is specially suitable for pumps 'employed in dredging, and in some mining operations, such as pumping slimcs and tailings, where the wear on the pumps is very great, a secondary chamber or lining n, o, may be provided inside the outer casing of the pump, specially designed to easily receive the rubber facing and constructed so.

that Vit can be easily removed and re-rubbered. Y

Another form of such a separate casing is shown at lIig. 4, the casing here being constructed in two parts, o and m, which are lining, said neemt@ arranged to contain the volute chamber e. The portion of o against which the impeller contacts contains grooves similar to those al-v ready described. y

In this form of the invention, the parts n, o, forming the pump chamber are mounted inside a second chamber formed bythe two parts a, b, the part of the second chamber a carrying the impeller bearings. The back of the propeller is provided with balancing vanes g, which rotate in the chamber formed at the back of the propeller between the two parts n and o. The inner chamber e is of the usual spiral form, and has all its inner surfaces forming the fluid passages lined with rubber vulcanized on to the two parts n, o. The delivery orifice of the pum spiral is opposite a continuation brano with an outside flange formed on the outer chamber, the inner chamber being bolted I claim as new and desire to secure by Letters Patent is l 1. A centrifugal pump comprising in combination a casin a resilient lining completely covering t e innersurfac'e of said casing, an impeller including a rotating disk and vanes made entirely of resilient material carried on the side of said disk, as and for the purposes described. v

2. A centrifugal pump comprising in combination a casing, a resilient lining completly covering the inner surface of said casing, grooves in the face of said resilient grooves being in the direction of iiow of the uid through the pump, an impeller including a rotating disk and vanes made 'entirely of resilient material carried on the side of said disk, as and for the purposes described.

In testimony whereof I have signed my name to this specication.

R. C. PARSNS.

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