US1797980A - Hydroturbine pump - Google Patents

Description

March 24, 1931. f 1. c. JENNINGS; 1,797,980

h HYDROTURBINE PUMP Filed Jan. 19, 1929 5 sheets-sheet 1 March 24, 19311. C, JENMNGS 1,797,980

HYDROTURBINE PUMP Filed Jan. 19, 1929 3 Sheets-Sheet 3 INVENTOR 151629 J.' rlmzf'lzoya A TToRNEYJ Patented Mar. 24,1931 i l narran sraras rrsNrori-ica y ERVENG C. ENNING 0F SOUTH NORWALK, CONNEGTICUT nrnacauiasmn amar Appication led January 19, 1929. Serial No. 333,602;

This invention relates to thetype of hydroshowing the application of my invention to a turbine pump shown in the prior United slightly different type of pump, and States patents to Nash, No. 953,222, granted Fig. 6 is asimilar detail view showing a March 29, 1910, and No. 1,091,529, granted further modification.

5 March 31, 1914. Referring particularly to Figs. 1, 3 and 4, litiI In'the manufacture of the Nash type of l have indicated a pump which is in genpump, it has been found that theperi heral eral the well known Nash type and comprises l speed of the rotor must not exceedade nitely a rotor 10 mounted on`r a shaft 11 and rblincwn rate if the efficiency of the pump is tatable in a casing 12. The rotor is posil@ to be maintained. All attempts to increase tively'driven from a motor or other suitable 60 the relative axial length of the rotor beyond source of power.. The rotor 10 is preferably approximately 40% of its outside diameter of a general cylindrical shape and rotates have also been found to produce a sharp drop within a compartment or chamber in the in eiiciency in higher vacuum operation. casing 12, which is substantially of elliptical @onse uently, the only practical method cross-section, the chamber closely fitting the hereto ore known for increasing the capacity rotor at the two sides thereof, as shown in of the Nash type of pump has been by in- Fig. 3, and being'spaced therefrom to form creasing the diameter proportionately to any lobes above land below the rotor. increase in rotor length, and by correspond- The rotor, as is usual in Nash pumps,fis

2@ ingly reducing the number of revolutions so. divided by substantially radial vanes in a 70 as to maintain the same peripheral. speed of series of rotor pockets or compartments, each the rotor. This method, of increasing cahavinga port or opening at the bottom. The pacity involves increases in weight andmotor casing 12 is provided with an inlet 13, consize out of all proportion to thej gain in canected through an inlet passage 13a to inlet S5 pacity. Y f ports 14. v 'F5 The principal object of this present vinvenln vthe preferred form, the walls of the tion is to provide means permitting widenrotor chamber are extendedinward to form ing of the pumpv rotor and thus securing adconical hub portions 25, provided with openditional capacity without reducin the eci- Iings 28 connecting the inlet ports 14 and s@ ency of the pump. A more speci c object is passages 14a with the otor pockets. Addi- 80 tc provide means, as a separating member, tional openings 28 connect therotor pockets for stopping the surging of the water in the with. passages 15a and dischargev ports 15, lobes o" the pump casin whereby the length connected by an outlet passage16 to the pump cf the rotor may be su stantially increased outlet 17.

while maintaining or increasing the eiiiciency ln the 'operation of pumps as thus far de- 35 i of the pump. @ther objects and advantages scribed, it has been found that tlie axial cf the invention will be hereinafter described vlength -of the rotor cannot substantially exand more particularly pointed out in the apceed 40% of its outside .diameter without f pended claims. y reatly reducin the efficiency of the-pump. 4@ Certain forms and modifications of the'int appears pro able that this reduction in 9 venticn are shown in the drawings, in .which eliciency on increase of'length is due to the ligl is the longitudinal sectional .elevasurging of the water axially in the elliptical -ticn cfa pump embodying my improvements, lobes or spaces surounding the rotor in the 'taken on ine 5 5, F1g. 3. upper and lower portions of the casing.

Fig. 2 is a partial elevation similar to Fig. In order to reduce or prevent this surging 95 1, but showin a slight modification; action, I have provided one or more separat- 3 andg4 are transverse sectional ele- 4ing members 20, preferably formed integral -vations, taken-along the lines 3-3 and 4 4 .on the inside of the casing in the elliptical in Fig-1'. portions thereof and extendin inward closel Fig. '5 is a longitudinal sectionalelevation yadjacent to 'the periphery o the rotor.

size can be operated.

When such a separating partition is .pro-

A vided, it is found possible to very substanti.

ally increase the length of the rotor relative to its out side diameter without loss of eliticiency. It is thus possible to correspondingly increase the capacity of the pumpby merely increasing the length thereof and withou change in the peripheral speed.

I also find it desirable to provide a corresponding separating member 21 (FigL 1) in the hub portion of the rotor itself, this separating member 2l strengthening the vanesl of the rotor and also co-operating with the separating members 20 in reducing cross cur-v rents within the pockets of the rotor.

In Fig. 2 I have indicated a separating member 24 in the rotor extended outward substantial to the periphery of the rotor to still further decrease the cross currents.

In Fig. 5, I have indicated the use of the separating members 20a in a slightly different type of pump, in which the ports 30- are formed directly in the rotor chamber end walls, instead of being formed in extended hub portions of` the casing. The action and the advantages of the separating members 20a are the same as previouslydescribed.

In Fig. 6, I have indicated the additional -use of separating members 2lb in a pump of the type shown in Fig. 5.

In all forms of the invention illustrated,

the apparently'simple change over previous practice by inserting the separating members in the casing lobe or lobes, or in the lobe or lobes and alsoin the rotor, has been found to produce very remarkable increases in eficiency and also great economy in manufacture. It has been found, for instance, that the capacity of a certain size pump can be increased by this method with a saving of at least one-third in weight of metal over a pump of the same capacity but with a larger diameter and narrower rotor, and with areduction in motor size due to the increased speed at which the longer pump of smaller the advantages thereof, I do not'wish to bey limited to the details herein disclosed otherwise than as set forth in the claims.

What I claim is: y o 1. In a hydro-turbine pump of the type using water as a seal and havlng ports', and displacement chambers coo erating with said ports, the combination o a circular rotor with an elliptical casing therefor and means to prevent the surging of the water in an' axal direction comprising a projection extending in from the peripheral casing toward the rotor.

using water as a seal and having ports, and displacement chambers cooperating w1th`sa1d.

- v 2. In a hydro-turbine pump of the type ports, the combination of a circular -rotor with an elliptical easin therefor and` means to prevent surging of tie Water in an axial direction along the space outside of the path of the rotor comprising a separating member projecting transversely inward from the casing toward the rotor in said space. 3. In a hydro-turbine pump of the type using water as a seal and having ports, and

displacement chambers cooperating witht'said ports the combination with a rotor and a casing in which said rotor is located, said i Casing having a lobe of greater diameter than the rotor, of means to reduce the axial surging of the water in the lobe of the pump coinlli.

prising a separating member located withinv the casing in said lobe and between the ends 'l f said casing. f

l 4. In a hydro-turbine pump of the type 'using water as a seal (and -having ports, and

displacement chambers cooperating with said ports, the combination with a rotor and a cas` ing in which said rotor is located, said casing having a lobe of greater diameter than the rotor, of meansto reduce the axial surging of the water in the lobe of the pump com# ,prising a separating member located within the casing in said lobe and between the ends of said casing, said member extending inward closely adjacent said rotor.

5. In a"hydroturbine pump, the combination with -an elliptical casing of a cylindrical rotor contained within the casing, whereby the casing has portions spaced from the rotor on opposite sides, of means to prevent the flow of water longitudinally of the pump comprising a separating member extending in from each side of the casing substantially half way between its ends toward the rotor, whereby the eiiiciency of the pump is maintained when the relative length of the rotor is increased.

6. In a hydro-turbine pump of the type using water as a seal and having ports, and displacement chambers coo erating-.withi said ports, the combination wit an elliptical casing of a rotor contained. within the casing, whereby the casing is spaced from the rotor' on opposite sides, of means to restrict the `longitudinal fiow of water in the casing comprising separating members extending in from eachside of the casing toward the rotor -tojprevent the flow of the water longitudinally thereof, and a separating member extending outwardly from the hub ofthe rotor substantially in registrationwith the first named members.

. 7. In a hydro-turbine pump of'the type using water as a seal and having ports, and

. displacement chambers cooperating with said ports, the combination of a' circular rotor t with an elliptical casing therefor, of means to restrict the surging of the water in an axial direction comprising means extending transversely of the casing 1n the space between the peripheral casing and the path of the rotor.

8. In a hydro-turbine pump of the type using'water as a seal and having ports, and displacement chambers cooperating with said ports, the combination of a circulahrotor with an elliptical casing therefor, of means to reduce cross currents in the pump comprising a continguousbalie wall located in the central part of the enlargement between the side walls of the pump 7and projecti/n 'into the chamber between the surface passe over by the extreme edge of the rotor and the 1l periphery of the housing.

.9. Ina hydro-turbine pump, Vthe combination of a circular rotor with an ellipticalcas-l ing therefor, 'of means to reduce cross currents within the casing and within the pockets of the rotor comprising a contiguous baille wall located in the central part of the enlargement between the side walls of the pump and projecting into the chamber be tween the surface passed over by the extreme edge of the rotor and the periphery ofthe housing, and another baile walllocated in the' upperportion ofthe rotor to cooperate with said first mentioned baile wall f In testimony whereof I have hereuntov afl fixed my signature.

A IRVING JENNnvGs

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