US2659311A - Centrifugal pump - Google Patents

Description

Nov. 1 7, 1953 G. H. SCHAFFER CENTRIF'UGAL PUMP Filed June 20, 1949 M x zw w Patented Nov. 17, 1953 UNITED STATES PATENT OFFICE CENTRIFUGAL PUMP George H. Schafi'er, Waterbury, Conn. Application Juneau, 1940, Serial No. 100,110

13 Claims. 1

This invention relates to an improvement in centrifugal pumps for pumping liquids, such,-for example, as water and other liquids.

It is the main object of this invention to provide a centrifugal liquid pump of improved efficiency by reducing the frictional resistance of the liquid in its passage through the pump.

It is another object of this invention to provide a more eificient pump by providing" an improved type of spiral screw conveyor, in connection with the rotor of the pump.

It is still another object of this invention to provide a more efiicient centrifugal pump by combining the advantages of saidimproved spiral screw conveyor rotor with liquid deflecting blades at one-end adapted to deflectand direct the intake liquids into the path of the screw conveyor rotor member, and a squirrel cage'blade arrangement at the other end to aid in deflecting and directing the liquids at the discharge end.

With the foregoing and other objects in view, I have devised the construction illustrated. in the accompanying drawing forming a part of this specification. It is, however, to be understood the invention is not limited to the specific details of construction and arrangement shown, but may embody various changes and modifications within the scope of the invention.

In this drawing:

Fig. 1 is a side view partly in section;

Fig. 2 is a left end'view partly in section; of Fig.1,and Fig. 3 is a right end view partly in section, of Fjg 1 Y 'In the preferred embodiment illustrated in the drawing, a longitudinal cylindrical pump housing generally designated it comprises an upper section Mia and a lower section Hlb. Thelower section I b is provided with mounting. legs ll, an inlet port I2 and an outlet or discharge port l3. Both upper and lower sections I (la and Nb are provided with co-acting continuous flanges M for water-tight connection aroundtheirlongitudinal and transverse sides atthe point where both sections are joined, said flanges being provided with spaced and aligned holes, the holes in the flange of the lower section lflb being preferably screwthreaded to receive threaded screws or studs l5.

In the radial center of each'end' of the assembled housing a circular aperture [6 is provided with screw threads around its periphery adapted to engage external screw threads of packing nuts or followers Ila and I lb for the usual packing I'Ic, v

The longitudinal circular wall 22 of chamber 2m is or substantially uniform diameter for a short longitudinal distanceat the location near the inlet port [2.

outlet port (3, at which the tapered wall 22a of the chamber 2|a terminates, and forms the inner.

periphery of ashoulder 23.

stitutes one transverse end Transverse end wall Ilicof the outlet port I3 constitutes the Shoulder 23 conof chamber 2lb. housing near the with each other opening 24b at ing on the size of the pump.

The tapered sleeve 26 is open at its large end on-which is bolted a ring 28 carrying radially extending blades 29 which are inclined, as shown varied as desired and dependin Fig. 1, in the direction of rotation so their forward free edges are ahead of their rear edges. The hub of the ring 28 and blades 29 is a grooved ring 30 adapted to of the housing, through the be splined or keyed at to a drive shaft 3i longitudinally extending out packing nut i6a,

and journalled in bearing arm I80, by a suitable bearing and adapted to be driven by a gear,

sprocket or pulley drive 32 by power means, such, for example, as an electric or other motor 33.

The tapered sleeve 26 is likewise open at its narrow end, and attached to the sleeve at said narrow end is a squirrel cage type of blade arrangement in which a plurality of spacedand inclined blades with the sleeve member 26 and mounted 35b to rotate on the same The blades 34 are Fig. 3, backtheir tween rings 35a and center as the sleeve member. preferably inclined as shown in wardly from the direction of rotation so 34 are arranged longitudinally 15 outer edges are rearwardly of the inner edges, so that their counterclockwise rotation as viewed in Fig. 3 will carry and deflect liquids into outlet port i3. size to rotate within chamber The rings 35a and 35b are of suitable 2ib leaving only a very small clearance between the wall 24 and the periphery of said rings.

A circular disc ing shaft 31 is bolted to ring 351) so 36 having a laterally extendthat shaft 31 extends through packing nut lib and journals in bearing of bearing arm i8b.

Clearance between outer tapered wall of sleeve 26 and inner tapered wall 22a of the housing should be only large enough to allow free rotation of the sleeve within the housing.

Thus it can be seen that the rotor of my pump comprises a combination of three elements, viz.: a tapered longitudinal tubular sleeve or shell 26 provided with internal spiral feed ribs 21, a plurality of spaced, inclined deflecting blades 29 radially disposed about the axis of the sleeve and mounted transversely at the large opening on the sleeve, and a squirrel cage blade arrangement 3! connected to the sleeve at its smaller opening.

The rotor sleeve member 26 maybe made integral, but it is preferred that it be cast in two longitudinal sections and bolted together to effect manufacturing economies, or the completerotor including the radially disposed transverse defleeting blades at the large opening of thesleeve and the squirrel cage rings and blades, including the splined or keyed hub rings, may be made by casting in two longitudinal sections, each section being integral, thus eliminating the need for mounting and bolting the blade members onto each end of the sleeve.

ward movement to uid into chamber liquid into and out of the outlet port i3.

the liquid, pushing the liq- 2lb where blades 34 of the squirrel cage arrangement deflect and throw the The tapered shape of the sleeve aids the spiral ribs in channeling as the centrifugal the liquids into chamber 2!!) force due to rotation of this sleeve throws them out to and maintains them on the inner surface of this sleeve.

One of the advantages of my invention lies in the arrangement that the interior wall of the sleeve 26 rotates with the liquids as distinguished from devices in which the propelling means pumps water through stationary chamber walls, thereby reducing friction with the wall. Another advantage is in the arrangement eliminating screw conveyor blades of the type extending to the center or axis of rotation, and substituting in my invention a type of spiral conveyor thread on the inner surface of a sleeve or shell leaving a wide opening or free space at the center between opposite peripheral edges of the threads, thus also diminishing resistance and friction.

Another advantage of my invention is in combining the deflecting and pumping action of the blades 29 and 34 with the action of the sleeve 26, thereby accomplishing more efficient pumping.

Having thus set forth the nature of my invention, I claim:

1. A centrifugal pump for pumping water and other liquids comprising a longitudinal housing member provided at one end with an inlet port and the other end with an outlet port, the interior walls of the housing so formed as to provide two longitudinal chambers communicating with each other, one of the chamber beginning at the transverse end wall near the inlet port and tapering inwardly from a point near the inlet port to a point just before the outlet port, the other chamber being of substantially shorter longitudinal dimension than the first chamber and of substantially uniform diameter, the diameter of the smaller chamber being larger than the diameter of the large chamber at that point where the taper terminates; a rotor member within the housing comprising a tapered, hollow, tubular sleeve adapted to freely rotate within the tapered walls of the large chamber, a continuous spiral conveyor thread protruding from the interior wall of the sleeve, radially disposed and spaced blades mounted transversely on the sleeve at its large opening, said blades being inclined to deflect liquid into the sleeve when rotated, a hub at the radial center of the blades, a drive shaft engaged in the hub and extending out of the housing, a bearing for the shaft, a squirrel cage blade assembly attached to the tapered sleeve at its smaller opening and adapted to 2'0- tate within the smaller chamber, a disc attached to the outer transverse side or the squirrel cage, a shaft attached to and laterally extending from the radial center of the disc through the housing, a bearing for the latter shaft, and power means to drive the first mentioned shaft, whereby the rotor, the first mentioned blades, and the squirrel cage will rotate simultaneously within a substantially watertight housing, draw liqui into the inlet port, the first mentioned blades deflecting the entering liquid into the rotating tapered sleeve, the liquid carried forward by the spiral conveyor threads into the smaller chamber and deflected towards and out of the outlet port by the squirrel cage blades.

2. A centrifugal pump comprising a, longitudinal housing having an inlet and an outlet port, aligned bearings at opposite longitudinal ends of the housing, said housing formed on the inside to provide two longitudinal circular chambers communicating with each other, one of said chambers being longitudinally larger than the other and tapered inwardly towards the smaller chamber, the smaller chamber having a larger diameter than the diameter at the small end of of the large chamber and the diameter of the small chamber being substantially uniform throughout its longitudinal dimension; a rotor contained within the housing comprising a longitudinal sleeve tapered and adapted to rotate withn the tapered at its larger opening, to the hub and extending out of the housingat and the blades of the squirrel cage deflecting the of the outlet port.

3. The combination in a centrifugal pump comprising a longitudinal substantially cylindrical housing provided with an inlet and an outlet port, the walls of means to drive one of the shafts, whereby rotation of the rotor will draw liquids into the housing from the inlet port and deflect the liquids into the sleeve, the spiral threads propelling the liquid into the squirrel cage, and the squirrel cage blades deflect the liquid out of the outlet port.

4. Zhe combination in a centrifugal pump comprising a housing provided with an inlet and an outlet port, means for mounting the housing to a base, bearing means for a shaft protruding out of the housing, the walls of the housing being formed to provide two longitudinal communicating round chambers, one or" said chambers being longer than the other, the longer chamber being tapered inwardly toward the shorter chamber, the diameter of the shorter chamber being larger than the opening at the small end of the tapered chamber, a rotor member comprising a longitudinal tubular tapered sleeve provided with spiral conveyor threads on its interior wall, a foraminous disc made up of a plurality of radially spaced and inclined blades connected transversely across the large opening of the sleeve, a squirrel cage blade member connected to the other transverse end of the sleeve, shaft means journalled in the bearings adapted to rotate the rotor member, and power means to drive the shafting, whereby rotation of the rotor will draw liquid into the housing from the inlet port and deflect the liquid into the sleeve, the spiral threads propelling the liquid into the squirrel cage, and the squirrel cage blades deflecting the liquid out of the outlet port.

5. The combination in a centrifugal pump, of

rotatable movement within the housing with a minimum of clearance between the outer periphery of the sleeve and the adjacent walls of power means to drive the shaft means, whereby rotation of the rotor member within the housing will provide a pumping action to draw liquids into the housing and deflect them into the sleeve where the spiral ribs will further propel them into the squirrel cage where the action of the blades of the squirrel cage will deflect the liquid towards and out of the outlet port.

6. In a centrifugal pump, the combination of a rotor member comprising a tapered tubular sleeve provided. with spiral ribs protruding a short dis tance from its interior wall, a plurality of blades radially spaced about the longitudinal axis of the sleeve attached at the transverse end of the sleeve outlet end of the sleeve and connected with the sleeve to rotate with it, a housing enclosing the rotor member, the housing being provided with an inlet and an outlet port, drive shaft means connected to the rotor member, bearing means, the shaft means protruding out of the housing and journalled in the bearing means, and power means to drive the rotor, whereby rotation of the rotor member within the housing will provide a pumping action to draw liquids into the housing and deflect them into the sleeve where the spiral ribs will further propel them into the path of the longitudinal blades at the oulet end where the action of the last mentioned blades will deflect the liquidtoward the outlet port,

7. The combination in a centrifugal pump of a rotor member comprising a longitudinal tubular sleeve provided with spiral ribs protruding a short distance from its interior wall, a plurality of inclined blades connected to the sleeve to rotate therewith and radially disposed in the center of the inlet end of the sleeve to deflect liquid into the sleeve, and a squirrel cage blade rotor attached to the other transverse end of the sleeve to rotate with it and having its radial center in alignment with the first blades, a housing enclosing the rotor member and provided with an inlet and an outlet port at the opposite ends thereof, and shaft means engaging the rotor for rotating it, and driving means for the shaft means.

8. The combination in a centrifugal pump of a rotor member comprising a longitudinal tubular sleeve provided with spiral ribs protruding a short distance from its interior wall, a plurality of inclined blades radially disposed about the longitudinal axis of the sleeve and attached the inlet end of the sleeve to rotate with it and to deflect liquid into the sleeve, a squirrel cage blade member attached to the other end of the sleeve to rotate with it, a. housing having an inlet and an outlet port at opposite ends of the sleeve and enclosing the rotor member, bearing and shaft means for supporting and rotating the rotor member, whereby rotation of the rotor member within the housing will provide a pumping action to draw liquids into the housing and deflect them into the sleeve where the spiral ribs will further propel them into the squirrel cage where the action of the squirrel cage blades will deflect the liquids out of the outlet port, and means for rotating the shaft.

9. The combination in a centrifugal pump comprising a housin having an inlet and an outlet port. a rotatabl longitudinal tubular sleeve having spiral screw thread ribs protruding a short distance into the sleeve from its interior wall, rotatable means adapted to deflect and propel fluids into one end of the sleeve, rotatable means at the other end of the sleeve adapted to propel and deflect fluid from the sleeve to the outlet port, the housing enclosing all of the rotatable members within itself, means to rotate the rotatable members, whereby the rotation of the rotating members will produce a pumping action to draw in liquids through the inlet port and direct or deflect the liquids into the sleeve where they are further propelled by the spiral ribs toward the other rotatable deflecting means and by the last mentioned means propelled and defiected out of the outlet port.

10. In a centrifugal pump, the combination comprising a housing having an inlet and an outlet port and a longitudinal tubular sleeve rotatably contained in the housing, spiral conveyor screw threads of rib-like construction protruding a short distance from the interior wall of the sleeve, means at one end of the sleeve and rotating with the sleeve to deflect liquids into the sleeve, means at the other end of the sleeve and rotating with it to deflect liquids from the sleeve into the outlet port, and means to rotate the deflecting means and the sleeve within the housing.

11. The combination in a centrifugal pump of a rotor comprising a longitudinal tubular sleeve provided with spiral thread of rib-like construction protruding a short distance from the interior wall or the sleeve so as to leave the central-portion open and unobstructed, and a housing provided with an inlet and an outlet port and containing the rotor within itself in rotating position, deflector blades at the inlet and outlet ends of the sleeve and rotatable therewith to respectively deflect liquids from the inlet port into the sleeve and from the sleeve to the outlet port, and means for rotating the rotor.

12. The combination in a centrifugal pump of a rotor member comprising a longitudinal tubular sleeve provided on its interior surface with a spiral conveyor thread projecting a short distance above said surface, a spaced blade disc attached transversely to one end of the sleeve to rotate therewith, the blades of the disc being radially disposed about the longitudinal axis of the sleeve and inclined to deflect liquid into the sleeve, and a housing having an inlet and an outlet port, the housing containing the rotor membet, and means to rotate the rotor member within the housing.

13. The combination in a centrifugal pump of a rotor member comprising a longitudinal tubular sleeve provided with spiral conveyor thread on its interior surface projecting a short distance above said surface, a squirrel cage blade member connected to the outlet end of the sleeve, the interior chamber of the squirrel cage com municating wrth the chamber of the sleeve, means at the inlet end of the sleeve and rotatable with the sleeve to deflect liquids into the sleeve, and housing means including an inlet and an outlet port enclosing the sleeve and the squirrel cage, and means for rotating the sleeve and squirrel cage within the housing.

GEORGE H. SCHAFFER.

References Cited in the file of this patent UNITED STATES PATENTS

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