USRE14988E

USRE14988E - parsons

Info

Publication number: USRE14988E
Authority: US
Publication date: 1920-11-16

Description

, R. C. PARSONS. ,FLUID PUMP, TURBINE, AND THE-LIKE.

APPLICATION FJLED JAN. 21, I920.

6 1 V 0 N d e. u S .E B R 2 SHEE}3,9T88.

n. c. PARSONS.

FLUID PUMP, TURBINE, AND'THE LIKE.

APPLICATION FILED mun. 1920. j

14,988; 2 SHEETS-SHEET 2;

Beissued Nov. 16, 1 920.

UNITED STATES T PATENT OFFICE.

RICH.AJR.D cnnnn reasons, or LONDON, ENGLAND. FLUID PUMP, runnmn, AND THE Linn.

14 988 Specification of Reissued Letters Patent. Reissued Nov, 16, 192Q Original No. 1,254,158; dated January 22, 1918,Serial No. 67,521, filed December 18, 1915. Application 101' reissue filed January 21, 1920. Serial No. 353,040}.

To all whom it may concern: fibrous and other matters which may lodge 55 Be it known that I, theHonorable RIcH- between them and the casing, the revolu- ARD CLERE PAnsoNs, M. A., M. Inst. C. E., a tion of the succeeding resilient blades givsubject of the King of Great Britain and ing successive impulses to the lod ed mat- Ireland, and residing at 39 Victoria street, ter, until it is finally expelled fi-om the London, S. W., England, have invented cer-- pump. The wear of the pump by sand or 60 tain new and useful Improvements in and other abrasive matter is greatly reduced by Relating to Fluid Pumps, Turbines, and the the use of the rubber or like coating, it havlike, of which the following is a specificaing'been found by experiment that rubber of ,tion.v t e quality specially selected is, under the This invention relates to improvements conditions existing, less liable to abrasion 65 in centrifugal pumps, turbine type fluid than metal. I pumps, or water turbines and the like, of Referring to the accompanying drawthe type in which resilient blades are 'emin s v plozed, lgure 1 is a-transverse section of one hen centrifugal pumps, for example,v form of pump constructed according to the 7 0 are employed for pumping fluid containing invention; v r i sand or other abrasive matters, it is found F igs..2, 3 and 4 being similar views of that serious abrasion of the internal parts modified forms.

takes place, with resulting great reduction a F ig.-5 is a front viewof the pump shown of efficiency, besides giving rise to frequent in Fig. 1, the, front portion of the casing. 75 and costly repairs; and when such pumps eing removed. l are used for pumping fluids containing Fig. 6 is a View of the front portion of .fibrous matter or the like, such matter bethe casing, as seen from the interior of the comes'wedged between the impeller and the pump,'showing the grooves in the'face.

Surfaces against hi h it; l ,v f In carrying the invention into effect, ac- 8f quent-ly causing stoppage of the pump. cording to the form shown in Fig. 1, which, The object of the present invention is to represents a centrifugal p p of the Single overcome these difficulties. inlet type, the pump chamber is constructed The invention consists in an improved .Of two parts, a, b respectively. The backform of pump in which the vanes of the importion a contains the bearing, which is 85 peller are constructed entirely of resilient l rica ed wi h a- Stream of water, and also material the'face against which :it contacts an air pipe for balancing purposes and'in also being constructed of resilient material, which works the spindle c carrying-theimwhile the passages through which the fluid peller d, and attached to which is the necespasses are of such form that with the vane y r s ing hl part also con resiliency, solid, fibrou and oth m tt tainsthe outer or volute chamber e of the will pas through the um dily and pump, and the discharge pipe or outlet f. without blocking it. he volute chamber e is closed at the front 40 he invention also consists in the im-. by the part b, which is connected to the proved constructions of pumpshereinafter back portion by bolts passing through 9:

escribed. v flang s on the two parts. The center of The invention is a plicable to centrifugal he portion 6015' the pump is provided with pumps of any of the well -known forms, a circular aperture 9, which serves as the having unshronded impellers with ith r inlet. The impeller is constructed in the single or double inlet. following manner :The center is com y the use of the resilient impellers, and structed of metal which is suitably. attached suitable grooves in the surface of the casto the spindle upon which it revolves. The ing against which they contact, according front face of this metal is provided with 50 to the invention, fibrous and the other deep grooves, following the line of the usual solid matters are readily passed through the impeller blades, and by the use of asuitable pump. Owing to the resiliency of the mold impeller blades h of the usual sha )0 blades, aided by the grooves in "the face of but of rubber are formed on the face of t e the casing, these are enabled to overrun any Impeller The 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 formed, so as to allow bending of the impeller blades without overstressing. The rubber of which these vanes are formed is allowed to extend over and to be securely cemented to the flat face of the impeller. The outer circumference of the impeller lies just within the orifice of the delivery chamber f. Spiral grooves 70 are formed in the face of the part 1) adjacent to the impeller blades, these grooves being of the form illustrated in Fig. 6, and continued some distance along the inlet pipe 9. These grooves k 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 casing of the pump a contains only one-half of the volute chamber e, and of the outlet pipe f, the other half of each of these being formed by'the front portion 1, so that these two portions of the front consist of simple castings without cores. The central opening of the part Z of the casing is of slightly greater diameter than the impeller d, so that the latter can be withdrawn through it. This opening is closed in by'a casting 6 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 on to the several parts, as illustrated. The vanes for balancing purposes at the back of the impeller may also be made of rubber if desired.

In 'the form of the invention shown in Fig. 3, which is specially suitable for pumps employed in dredging, and in some mining operations,- such as pumping slimes and tailings, where the wear on the pumps is very great a secondary chamber or lining 'a, 0, may be provided inside the outer casmg of the pump, specially designed to easily receive the rubber facing and constructed so that it can be easilyremoved and re-rubbered. i Another form of such a separate casing is shown at Fig. 4, the casing here bein constructed in two parts, 0 and .n, whic are arranged to contain the volute chamber 6. The portion of 0 against which the impeller contacts contains grooves similar to those already described.

In this form of the invention, the parts n, 0 forming the pump chamber are mounted inside a second chamber formed by the 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 it and 0. The inner chamber 6 is of the usual spiral form, and has all its inner surfaces forming the fluid passages lined with rubber vulcanized onto the two parts n, 0. The delivery orifice of the pump spiral is opposite a continuation branch with an outside flange formed on the outer chamber, the innerv chamber being bolted circumferentially to the outer chamber.

In cases where pumps are lined with hard metal plates, great deterioration takes place at the joints of such plates, and the casings to which they are attached. According to my invention, I may prevent this by coating the face or edge or both ends of such plates with rubber, or by coating the casing under the plates.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is 1. centrifugal pump comprising in combination a, casing, a resilient lining completely covering the inner surface of said casing, and 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.

2. A centrifugal pump comprising in combination a casing, a resilient lining completely covering the inner surface of said casing, grooves in the face of said, resilient lining, said grooves being in the direction of flow of 'the fluid 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. 7

3. A centrifugal pump having an impeller of disk form with blades of resilient material laterally projecting therefrom determining .the flow of the fluid, and capable of permitof disk form with backwardly curved blades of resilient material laterally fprojectin therefrom determining the flow o the flui and capable of permitting the passage of fibrous and other matters without blocking.

' 5. A centrifugal pump comprising in combination an impeller of disk form with blades of resilient material projecting from at leastone side thereof, a casing having at least one.

inner side surface adapted to close laterally the passages between the said blades coacting with said impeller to deliver the impelled fluid while permitting the passage of fibrous and other matters without blocking.

6. A centrifugal pump comprising in combination an impeller of disk form wlth backwardly curved blades of resilient material projecting from at least one side thereof, a

caslng having at least one inner side surface adapted to' close laterally the passages between the said blades' co-acting with said impeller to deliver the im mitting the passage of ters without blocking.

7. A centrifugal pump comprising in com bination an impeller of disk form with brous and other matblades of resilient material projecting from at least one side thereof, a casing havin at least one inner side surface adapted to close laterally the passages between the said blades co-acting with the said impeller to deliver the impelled fluid, and grooves in said innerv side surface assisting the passage of fibrous and other matters.

adapted to close laterally at least one side thereof, a

' 8. A centrifugal pump comprising in combination an impeller of disk form with backwardly curved blades of resilient material projecting from at least one side thereof, a casing having at least one inner side surface the passages between the said blades co-acting with the said impeller to deliver the impelled fluid, and grooves in said inner side surface assisting the passage of fibrous and other matters. a

9. A centrifugal pumpcomprising in combination an impeller of disk form with blades of resilient material casing having at least one inner side surface adapted to close laterally the passages between the said blades co-acting with the said impeller to deliver elled fluid while per proj ecting from grooves in said inner side surface assisting the passage of fibrous'and other matters.

11. A centrifugal pump comprising -in combination a casing, rooves in said casing said grooves bein in t e direction of flow of fluid through sai pump, an impeller in said casing, vanes carried by said impeller and having a resilient surface engaging the part of the casing containing'said grooves.

12. A centrifugal pump comprising in combination a casing having an interior surface with grooves therein, an impeller in said casing and resilient vanes on said impeller engaging the surface of said casing having the grooves therein.

13. A centrifugal pump comprising in combination a casing having an inner surface, an impeller in said casing having vanes with a resilient surface bearing against the