US1210777A - Centrifugal pump. - Google Patents

Description

E. F. ENTWISLE.

CENTRIFUGAL PUMP.

APPLICATION FILED MAY 21, 1913. A mwmm Patented Jan. 2,1917.

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CENTRIFUGAL PUMP. APPucAnoN ruin MAY21.I9I&

Patented Jan. 2,1917

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EDWARD F. ENTWISLE, OF DUQUESNE, PENNSYLVANIA, ASSIGNOR TO HENRY R. 'WORTHINGTON, A CORPORATION OF NEW JERSEY.

CENTRIFUGAL PUMP.

emma.

.to' the construction of single stage pumps of the glass illustrated in the drawings.

In all centrifugal pump constructions with which I am familiar the water inlet passages terminate at their inner end or ends discharging into the pump impeller chamber in an annular space formed around the axis of the impeller shaft, the shaft ex tending lengthwise through such space into shaft bearings on the exterior of the pump casing. When the pump is constructed in such manner, rotative currents are formed or set up within the annular space at the discharge end of the inlet passages by reason of the rotation of the water in the impeller. These currents act to impede the flow of water from the inlet passages into the interior of the pump casing which forms the pumping chamber in which the rotary impeller of the pump is located.

In centrifugal pump constructions of that class in which the inlet passage enters the suction chamber transversely to the impeller shaft, as in the well known pumps in which the impeller takes its suction horizontally from a suction passage below the center line of the pump, a difficulty arises from the fact that the water in the suction chamber in flowing around the impeller suction is given a direction tending to carry it back through the suction chamber into the suction passage, this resulting in counter currents and eddies, and reducing the capacity and efliciency of the pump. I have discovered that by providing means whereby the formation is prevented of such rotative currents around the pump shaft within the annular space forming the discharge end of the stationary water inlet passages of the pumps that the pumping capacity and the eificiency of the pumps are very materially increased. I also preferably avoid the tendency to rotation of the water in the suction chamber by inclosing the impeller shaft within a fixed casing up to the entrance of the impeller so that there is no exposed ro- Specification of Letters Patent.

Patented Jan. 12, 1917.

Application filed May 21, 1913. Serial No. 769,027.

tating shaft in the suction chamber tending to cause rotation or whirling motion of the fluid.

One object of my invention in its most complete form is to provide a centrifugal pump having novel means whereby the creation of rotative currents about the pump shaft in the discharge end of the water inlet passages to the pump adjacent to the point of junction of the inlet passages with the impeller chamber of the pump casing is made absolutely impossible, such currents are totally eliminated, and the water is caused to enter the impeller chamber in'a path parallel with the axis of the pump shaft.

-Referring to the accompanying drawings, forming part of this specification, Figure 1 is a side elevation showing a centrifugal pump constructed and arranged in accordance with my invention. Fig. 2 is a transverse sectional elevation of the same taken on the line IIII of Fig. 1. Fig. 3 is a sectional plan on the line IIIIII of Fig. 1. Fig. 4 is a side elevation similar to Fig. 1, partly in section, the-section being taken on the line IVIV of Fig. 5, showing a modified form of pump constructed in accordance with my invention. transverse section taken on the irregular line VV of Fig. 4. Fig. 6 is a similar transverse section taken on the irregular line VI-VI of Fig. 4.

In the drawings the numeral 2 designates the top and 3 the bottom section of a centrifugal pump casing,'the casing having a water inlet 4 and discharge outlet 5. The pump has a shaft 6 on which the pump impeller 7 is mounted to rotate therewith, the impeller 7 being positioned within the impeller chamber 8 formed in the pump casing, and the shaft being journaled in laterally extending hubs 19, 19, formed on said pump casing;

As will be seen by reference to Figs. 1, 2 and 3, the water inlet 4 is divided or forked so as to form passages 9, 9 one on each side of the partitions 10 in the casing, the partitions 1O separating the water inlet passages 9, 9 from the impeller chamber 8.

Fig. 5 is a.

and central discharge passage 11 which conmeets the chamber 8 with the water discharge outlet 5. The suction inlets 9, 9 ex-. tend upwardly above the axial center of the horizontal impeller shaft 6 so as to pro- -side of the partitions 10 into the spaces at.

vide a space 12 around the shaft 6 on each side of the pump casing, the space 12 around the impeller shaft 6 and hub casing 19 and opening into the impeller chamber 8. The impeller 7 is mounted upon the shaft 6 and is provided with vanes 13 of the usual construction, and not forming part of this invention is not further described.

In constructing pumps in accordance with my invention, ribs or diaphragms 14; and 15 or a series of such ribs are provided within the space 12 which are positioned to extend radially, as is clearly shown in" Fig. 2, so as to form bafiles which break up or effectually prevent any rotative currents being formed within the space 9 at the dis charge end of the water inlet passages adjacent to the junctionof these inlet passages with the impeller chamber 8 within the pump casing. I have discovered'that by providing means such as the ribs 14, 15 for preventing the formation of rotative currents in this or like manner in pumps where the inlet passages open into the impeller chamber the capacity of a pump of given size willbe very largely increased, as well as materially increasing the efiiciency of the pump. In the construction shown in Figs. 4, 5 and 6 the same result is obtained by modifying the construction of the discharge ends 16 of the inlet passages 17, 17 as is clearlyshown in these figures, this modification comprising the formation of the septem or partition 18 within the annular space in the inlet passages at the discharge end or point of junction of the inlet passages with the impeller chamber 8 of the pump, said partition 18, extending backwardly from the end wall of the inlet conduit to the hub" casing 19. I

In the operation of centrifugal pumps constructed in accordance with my invention, the water or other fluid being pumped enters the pump inlet 4 and passes upwardly in the passages 9 located. on each the discharge end of the inlet passages adjacent to the junction of these passages with the impeller chamber.

The ribs or vanes 14 and 15, in the construction of Figs. 1, 2 and 3 and the rib 18 in the construction of Figs. 4, 5 and 6 en tirely prevents the creation of rotative currents. within the space at the inlet end of the suction passages and causes the water to flow in a path parallel with the axis of the rotating impeller shaft into the impeller chamber, instead of churnin or rotating about. the axis of the shaft wit in the spaces 12 at the discharge end of the inlet passages.

The advantages ofmy invention will be I .appreciated by those skilled in the art, as

actual tests show that by simply preventing the creation of all rotative currents at the discharge end of the inlet passages of the to travel along lines substantially parallel with the axis of the impeller at the moment it enters the impeller. e

2. K centrifugal pump comprising in combination, a casing, a rotary impeller mounted therein, aninlet conduit for said casing terminating in an annular chamber substantially concentric with said rotary impeller, and means located in said annular chamber for compelling the infiowing fluid to travel therethrough along lines substan-- tially parallel with the axis of the impeller,

said means including at least one partition.

located in said annular chamber, and extending entirely across the same in a plane substantially parallel to said axis.

' 3. A centrifugal pump comprising in com- ..bination, a casing formin a substantially circular chamber, an impel er in said chamber mounted on a shaft whose axis coin- 'cides with the axis of the chamber, means for delivering a supply of fluid to the impeller in said chamber around the shaft of V the impeller, and means for compelling sald fluidto travel in planes substantially parallel with the axis of said shaft, at the moment of its entry into said impeller.

4. A centrifugal pump comprising in com- -bination, a casing having a'circularpump chamber therein with'the usual side inlet at the center, and an impeller journaled in sa d casing and adapted to rotate in sald chamher, an inlet conduit connected to said inlet opening in the casing, and means for compelling the incoming fluid to travel in a direction substantially perpendicular to the plane of rotation of the impeller at the moment of its entry into thelmpeller.

5. A centrifugal pump having an impeller chamber, an annular lnlet chamber surrounding the axis of the impeller chamber at one side of said impeller chamber and communicating laterally therewith, an inlet passage communicating with the an nular inlet chamber, and means in said an nular chamber to prevent rotation of the inlet water in said inlet chamber wh ch would otherwise be caused by the rotation of the water in the impeller. r

-6. A centrifugal pump having an impeller chamber, an annular inlet chamber surrounding the axis of the impeller chamber at one side of said impeller chamber and communicating laterally therewith, an inlet passage communicating with the annular in let chamber, and means in said annular inlet chamber to direct the Water discharging therefrom into the impeller chamber in a direction substantially parallel with the axis of the impeller chamber.

7. A. centrifugal pump having an impeller chamber, an annular inlet chamber surrounding the axis of the impeller chamber at one side of said impeller chamber and communicating laterally therewith, an inlet passage communicating with the annular inlet chamber, and means in said annular inlet chamber to prevent rotation of the inlet water in said chamber, which would otherwise be caused by the rotation of the water in the impeller, and also to direct the water discharging from the inlet chamber to the impeller chamber in a direction substantially parallel with the axis of said impeller chamber.

8. A centrifugal pump having an impeller chamber, an annular inlet chamber surrounding the axis of the impeller chamber at one side of said impeller chamber and communicating laterally therewith, an inlet passage communicating with 'theannular inlet chamber, and means in said annular inlet chamber to prevent rotation of the inlet water in said chamber, which/would otherwise be caused by the-rotation of the water in the impeller, and also to direct the Water from the inlet chztmber to the impeller chamber in a direction substantially parallel with the axis of said impeller chamber, consisting of a partition occupying substantially the entire cross-sectional area of the inlet chamber at one side of the shaft opening therethrough and disposed substantially radial with respect to the axis of said chamber. I

9. A centrifugal pump comprising in combination, a casing, a rotary impeller mounted therein and provided with an axially disposed suction inlet, an inlet conduit for said casing terminating in a suction chamber which surrounds and extends to the inlet of the impeller, a shaft on which said impeller is ,mounted, a hub member inclosing the shaft and forming a bearing therefor which extends from the casing through the suction chamber substantially to the inlet of the impeller and one or more :versely to vanes extending from the hub member to the walls of the suction chamber and to the inlet of the impeller whereby the flow .is

ing an impeller with a horizontal suction entrance, a suction chamber surrounding the suction entrance of the impeller, a suction' passage entering the suction chamber transversely to the impeller shaft, one or more vanes in the suction chamber arranged to direct the flow about the suction entrance of the impeller and to separate the flow about the suction entrance from the incoming flow through the suction passage, whereby counter currents are avoided and the flow distributed throughout the impeller suction, and a fixed casing inclosing the pump shaft throughout the suction chamber in which the inner ends of said vanes terminate.

11. In a centrifugal or turbine pump having an impeller with a-horizontal suction entrance, a suction chamber surrounding the suction entrance of the impeller, a suction passage entering the suction chamber transthe impeller shaft, and one or more vanes in the suction chamber arranged to direct the flow about the suction entrance of the impeller and to separate the flow about the suction entrance from the incoming flow through the suction passage, whereby counter currents are avoided and the flow distributed throughout the impeller suction.

12. A centrifugal or turbine pump having an impeller with a horizontal suction entrance, a suction chamber surrounding the suction entrance of the impeller, a suction passage entering the suction chamber transversely to the impeller shaft, and one or more vanes in the suction chamber and extending from the inner wall to'zthe outer Wall ofthe suction chamber and arranged to direct the flow about the suction entrance of the impeller and to separate the flow about the suction entrance from the incomingflow through the suction passage, whereby counter currents are avoided and ,the flow distributed throughout the impeller suction.

In testimony whereof, I have hereunto set my hand.

EDWARD F. ENTWISLE.

Witnesses CHARLES McK. Moons, GEO. L. Nnrr.

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