US2590728A - Rotary pump - Google Patents

Description

ROTARY PUMP Filed June 16, 1950 INVENTOR. flaw/r .F'coQ/M/v/zL 0 Patented Mar. 25 1952 UNITED STATES PATENT OFFICE ROTARY PUMF Frank Scognamillo, Fair Lawn, N. J., assignor to Scognamillo Engineering Company, Bronx, N. Y., a company of New York I Application June 16, 1950, Serial No. 16am 1 Claim. (01. 103- 136) The invention disclosed in this patent application relates to rotary pumps of the type disclosed in Salvatore Scognamillo Patent No. 2,443,994 of June 22nd, 1948, and co-pending patent applications of Salvatore Scognamillo, Serial No. 33,407, filed June 16th, 1948, and Serial No. 66,098, filed December 18th, 1948, and Frank Scognamillo, Serial No. 77,649, filed February 21st, 1949, and Serial No. 87,658, filed April 15th, 1949, wherein the blades oi the pumps are slidingly confined in slots in rotors, operating eccentrically in the pump chambers.

Objects of the present invention primarily are to accurately control radial movement of the blades in the pump chambers to maintain either a desired clearance or close fitting engagement of the blades with the walls of the chamber and to accomplish all this with a minimum of friction and in a desirably simple, inexpensive form of construction.

Further objects of the invention are to attain the ends mentioned with a constructionof few parts and of rugged design, adapted for continuous operation without servicing or other attention.

Other special objects of the invention are to maintain efiective control of the pump blades inwardly as well as outwardly of the rotor structure, and this without applying undue frictional loads on the blades or other portions of the pump.

Other desirable objects attained by the invention are set forth or will appear in the course of the following specification.

The drawing accompanying and forming part of the specification illustrates a certain practical embodiment of the invention. Structure, however, may be modified and changed as regards the immediate disclosure, all within the true intent and broad scope of the invention as hereinafter defined and claimed.

Fig. 1 in the drawing is an end view of a pump incorporating features of the invention, showing the rotor and sliding blades within the pump chamber as they appear on removal of the end or cover plate of the pump;

Fig. 2 is a broken vertical sectional view of the pump as on substantially the plane of line 2-2 of Fig. 1;

Fig. 3 is a view similar to Fig. 2, showing a modified form of construction.

In the several views the shaft of the pump or rotary machine is shown at 5, carrying a rotor 6 having radial slots 1 slidingly receiving the blades 8 which are constrained to operate concentrically in the cylindrical chamber in which the shaft is eccentrically journaled.

This chamber is shown as made up of parallel end walls 9 and ID connected by'a cylindrical annular wall I I.

The inlet and outlet ports, which'may be reversible, according to the direction of the turning of the rotor, are indicated at l2 and [-3, opening directly through the cylindrical wall of the pump chamber.

' Desired control of the sliding blades is efiected in the first form of the invention illustrated, by having the blades extend full width beyond the ends of the rotor and by providing floating discs M at opposite ends of the rotor, rotating on stationary hubs IS on the end walls of the pump chamber concentric with the surrounding cylindrical wall ll, said discs having inwardly extending annular flanges l6 at the inner edges of the same, reaching in under the extended in ner edges of the blades. It will be apparent from Figs. 1 and 2 that the annular, inwardly projecting cylindrical flanges l6 of the floating end discs M, by engagement with the inner edges of the blades projecting beyond the ends of the rotor, will hold the blades outwardly and, if desired, clear of the bottoms of the radial blade confining slots 7 in the rotor. This positively prevents the blades fromsticking or jamming in the bottoms of the rotor slots.

The extent of outward radial movement of the blades is similarly definitely determined in th form of the invention shown in Figs. 1 and 2, by providing inwardly extended, annular flanges H on the outer edges of the floating discs l4, reaching in over the outer edges of the extended ends of the blades.

This confinement of the outward motion of the blades is particularly desirable when operating at high speeds to overcome the frictional effects of centrifugal force, and when handling liquids of high viscosity or containing a certain percentage of solids, to maintain a constant allowable clearance between the outer edges of the blades and the surrounding peripheral wall of the pump chamber.

By the substitution of diiferent end fioating discs, this blade clearance can be accurately determined and maintained.

Where it is more important to maintain desired clearances at the inner edges of the blades. a construction like that illustrated in Fig. 3 may be employed where, in place of disc formations at opposite ends of the rotor, plain, cylindrical, fiat rings [8 may be substituted, riding on the stationary hubs IE on the end walls of the pump housing and directly engaging and supporting the inner edges of the portions of the blades 3 which project beyond the opposite ends of the rotor.

This is a particularly simple, inexpensive and practical form of construction, enabling maintenance of desired clearances at the inner edges of the blades by a simple substitution of different size rings on th stationary hubs of the pump chamber.

While primarily a pump construction, it will be realized that the invention is applicable to motors and rotary machines generally, operating along the lines of the principles disclosed, and it is the intent of the claims t -QQVQ finch machines, generally.

In the form of the invention shown in Figs. 1 and 2, the floating discs I4 engage the, project, ing ends of the blades and so can be constructed of a material to more effectively seal and reduce friction on the ends of the blades.

In the second form of the invention illustrated in Fig. 3, the ends of the blades engage and are sealed by the end walls of the housing. Also, as shown in this view, the blades need not extend beyond the ends of the, rotor. Actually. as, indicated, the blades; may terminate at. the ends of the rotor, leaving the ends of the rotor as well as the ends of the blades, in sealing engagement with the end walls of the housing. To permitthis relation the ends of the rotor are countersunk, as indicated at [9, concentrically of. the

shaft, to accommodate or ride over the stationary hubs l5 and the. blade supporting rings 18 rotor having radial slots therein, radially disin cooperative relation to said surrounding cylindrical wall and their radially extending end edges projecting beyond opposite ends of the rotor, stationary hubs on the opposite end walls of said chamber concentric with said cylindrical wall and end discs rotatably engaged on said stationary hubs in free sliding engagement with theradially extending end edges of said blades, said discs having annular flanges at the inner edges of the same projecting inwardly toward the ends of the rotor into supporting engagement with the portions of the inner longitudinal edges of the blades which project beyond the ends of the rotor to hold the blades radially outwardlyinto cooperative relation with the cylindrical wall of the chamber and said discs further having annular flanges at the outer edges of the same projecting inwardly toward the ends of the rotor and engaging over portions of the outer edges of the blades projecting beyond the endsv of the rotor to confine radially outward movement of the blades in respect to the surrounding cylindrical wall of the chamber and said discs being free to remain stationary with respect to the rotor and blades or to turn, independently of each other and independently of the rotor and blades, whereby to maintain a sliding sealing engagement with the ends of the blades under various conditions of operation.

FRANK SCOGNAMILLO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Great Britain r- Sept, 13, 1923

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