US1532992A

US1532992A - Centrifugal pump

Info

Publication number: US1532992A
Application number: US684652A
Authority: US
Inventors: Edmund F Doty
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-01-05
Filing date: 1924-01-05
Publication date: 1925-04-07
Anticipated expiration: 1942-04-07

Description

Patented. Apr. 7, 1925.

UNITED STATES -A 11,53%992 PATIENT OFFICE.

EDMUND F. DOTY, 0F NORTH'. TONAWANDA, NEW YORK.

, CENTRIFUGAL PUMP.

Application filed January 5, 1.924. Serial No. 684,652.

To all lwhom t may concern:

Be it known that I. EDMUND F. Do'rY, a citizen of the United States, residing at North Tonawanda, in the county of Niagara and State of New York, have invented newand useful Improvements in Cen-- trifugal Pumps, of which`the following is a l so constructed that the "fluid, after. being acted upon by centrifugal force, is diverted approximately at right angles to the plane of rotation of the impeller into the pressure chamber, thereby more eiiiciently converting the absolute lvelocity due to tangential and angular velocity into pressure.-

A. further object is to provide a simple, strong and reliable pump of this character in which the pressure chamber is ,disposed at one or both sides of the impeller, whereby the direction of flow through said chamber is parallel or substantially parallel with the direction of rotation of the impeller.

In the accompanying drawings:

Figure l is a central longitudinalsection of a centrifugal pump constructed in accordance with my invention. Figure 2 is a transverse section Fig. r1.

-Similar characters of reference indicate d thereof in line 2 2,

` corresponding parts in bothfigures.

l By way of example, the invention is shown lin connection with a centrifugal pump of the single stage, double-suction horizontal shaft type, but it is to be underl stood that the same is equally applicable to single stage pumps of the single suction type or to multi-stage pumps of' either the Single or double-suction type, or to vertical shaft pumps including any of the aforesaid types.

The numeral 10 indicates the pump-casing having a centrally arranged impeller chamber 11, suction chambers 12 located on opposite sides of the latter in communication therewith and each having a suction inlet 13, and pressure chambers A14 disposed on opposite sides of the impeller chamber and encircling said suctionchambers, the pressure chambers having a common outlet or discharge noz'zle 15. Extending centrally through the impeller chamber and.- .suction chambers and through openings 16 on opposite sides ofthe pumpfcasing is a horizontal ydriving shaft 17 journaled in suitable bearings 18 formed on the extensions l19l of said casing.'

Arranged within the -impellerl chamber 11 Iand secured to the driving shaft is the impeller which preferably comprises a hub 20, a pair of spaced disks'or shroud-plates 21, and curved vanes or blades 22 disposed between' the latter and spaced apart to provide curved fluid passages23 opening outwardly or radially and enlarging toward the periphery of the impeller. The shroudplates are provided with outwardly-facing annular bearing flanges or rims 24 which engage corresponding bearing seats or recesses 25 formed in the pump-casing. As shown in the drawings, the impeller blades extend a suitable distance beyond the peripheral edges of the 4shroud-plates 21 to provide lateral discharge openings or ports 26 at opposite sides of the impellerwhich communicate directly with the adjoining pressure chambers 14, the external diameters -l of the latter being substantially the same as that of the impeller chamber.

Surrounding the impeller and disposed in proximity to the outer edges of the impellerblades 22 is an impact face or ring 27 which may be cast integral with the pump-casing, as shown inthe drawings` or which may be a separate part thereof. The width of this impact Aring is preferably equal to or somewhat greater than thev corresponding dimensions of the impeller blades. The purpose of this impact ring is to direct or divert the water issuing from the impeller in a lateral direction, or approximately at right angles to 'the plane of rotation of the impeller through the ports 26 into the adjoining pressure chambers 14. This reactionary effeet on the water in this manner results in more eiciently/ convertin the absolute velocity, whichlis the resu tant of both the tangential angular velocity, into press sure.

Itv will be noted thatthe impact ring 27 immediately'surrounds the impeller so that there lis'no appreciable space between the periphery of`v the impeller and said impact ring, whereby the Water thrown out by the impeller directly impinges against the impactl ring and is expelled' laterally into the pressure chambersv 14. l

The shaft-openings 16 of the pump-casing may be fitted with packing glands 28 to prevent leakage.

By arranging the pressure chambers along side the impeller chamber, the course of the fluid from the impeller to thevdis-` charge nozzle is in a direction substantially parallel with the plane of rotation of the impeller, thereby reducing the disk friction to Va minimum. Furthermore, by this construction, the customary concentric 4 or volute chamber surrounding the impeller and the usual clearance spaces are dispensed with, thereby eliminating the shock and a friction losses incident to this type of pump. I claim as my invention: l. A centrifugal pump, comprising' a casing having an inlet and a discharge, an imeller chamber in communication with said lnlet, an impeller including blades, open at its periphery and rotatably mounted in said chamber, and a pressure chamber arranged at one side of said impeller chamber and communicating with the same and with said chamber, a pressure chamber arranged aty one side of said impeller chamber and communicating with said discharge, and a chamberless memberl on said casing and immediately surrounding said impeller for diverting the fluid issuing therefrom at right angles to the plane of its rotation into said pressurecham er. o

3. A centrifugal pump, comprising a cas- 4. A centrifugal pump, comprising a casin having aninlet and a discharge, an impe ler chamber in communication` with said inlet, an impeller open'at its periphery rotatably mounted in said chamber, a pressure chamber arranged at one side of said,

impeller chamber and communicating with said discharge, the impeller having lateral discharge openings near its periphery for establishing communication between said impeller and said pressure chamber, and a stationery impact member disconnected from and surrounding said impeller in proximity to its eriphery, said impact nember being straight transversely of its ace.

5. A centrifugal pump, comprising a casing having an inlet anda discharge, an impeller chamber arranged substantially centrally of said casing and communicating with said inlet, an impeller open at its periphery mounted in said chamber, pressure chambers located on opposite sides of the impeller chamber and communicating with saiddischarge, the impeller having lateral openings in its opposite sides adjoining the periphery thereof for establishing communication between the impeller and said presn sure chambers, and an impact ring carried by said casing and lying in proximity to and in the plane of said impeller.

EDMUND F. OTY.