US1418041A - Centrifugal pump - Google Patents

Description

R. N. TRANE.

CENTRIFUGAL PUMP.

APPLICATION FILED Nov.II. 1920.

Patented May 30, 1922.

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JNVENTOA? 747AM C@ .ATTORNEYS Y H. N. TRANE. CENTRIFUGAL PUIVIP.

APPLICATION FILED NOV.III, |923` Patented May 30, 1922.

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REUBN N. TRANE. 0F LA GROSSE, WISCONSIN.

CENTRIFUGAL PUMP.

Specification of Letters Patent.

Patente-d May 30,1922.

Application led November 11, 1920. Serial No. 423,428.

To afl u-zom it may cm1-cern.'

Be it known that I, REUBEN N. TRANE, a

. citizen of the United States, and a resident of La Crosse, in the county of La Crosse and State of 'isconsin, have invented a new and useful Improvement in Centrifugal Pumps, of which the following is a full, clear, and exact description.

M v invention relates to pumps of the centrifugal type, and it consists in the comblnations, constructions', and arrangements herein described and claimed.

An object of my invention is to provide a pump in which the friction is reduced to a minimum. and at the same time to provide a construction with which it is possible to pump higher pressures than can ordinarily be attained with a single stage centrifugal pump.V

A further object of my invention is to provide a construction in which the number of stages may be increased. whereby higher heads mav be built up than is possible with a single stage.

A further object of my invention is to provide a device in which the pumping characteristic may be readily changed, so as to increase the quantity of vwater or other fluid being pumped, or to increase or decrease the limiting pressure by changing the ratio of the area of the blades of the impeller and the number of blades, to the area of the channel through which the water flows.

A further object of my invention isto provide a construction which can be readily made. because the parts are circular and can be machined to a great degree of accuracy, thereby preventing leakage.

Other objects and advantages will appear in the following specification, and the novel features of the invention Will be particu: larlv pointed out in the appended claims.

My invention is illustrated in the accompanying drawings. forming part of this application, inv Which- Figure l is an end elevation of one form of the device,

Figure 2 is a vertical section along the line 2 2 of Figure 1, y v

Figure 3 is a section along the line`3-3 of Figure 1,

Figure 4 is a fragmentary perspective View of a portion of the impeller. l

Figure 5 is a sectien along the line 5-4-5 of Figure 1,

Figure 6 is a view of a portion of a modified form of the device,

Figure T is an end view of a double stage pump, the cover plate being removed, and

Figure 8 isa section along the line 8-8 of Figure 7.

In carrying out my invention, I provide a suitable base 1 having bearings 2 for a shaft 3. 'The latter passes through a stuffing box 4, which also serves as a bearing. In the present instance I have shown la casing having a portion 6 integral with the base l. It is obvious that the casing may be a separate member and secured to the base. Carried by the casing is a cover plate 7 Which is secured to the casing by bolts 8, or in any other suitable manner. The cover plate in this instance has a centrallydisposed inlet 9. while at the top of the casing (shown in Figure 2) is an outlet 10. The interior of the casing is hollowed out .in cylindrical form to provide a chamber 11.

Mounted on the shaft 3 is the impeller. This consists of a hub 12, spokes or a Web 13. and a rim 14. The latter is provided with an annular'groove 15. A portion of this groove is taken up by impeller blades 16 of the shape best shown in Figure 4. The groove 15 forms a channel through which the Water flows, as will be explained later. It Will be noted that the blades 16 extend inwardly from the side Walls of the groove 15, but there is a space between the ends of the inwardly extending opposed blades. In Figure 4 I have shown these blades as havferred form, since it is easier tovcut the might be used very effectively. The blades 16 take up only a small portion of the area of the channel, usually in the neighborhood of one-fifth to one-'sixth of the area.

Disposed on one side of the outlet is a block 17 which, as Will be seen from Figure 5. extends into the annulargroove 15. The block is held by a bolt 18 and is designed to prevent the passage of water or other fluid past the point Where the block is loling curved sides. While this isthe prevblades with a round tool, a straight blade i cated, or, in other Words, to direct it into the discharge opening.

From the foregoing description of the4 various parts of the device,the operation thereof may be readily understood. The device is driven through any suitablev means, as byv a belt (not. show'n) applied to the pulley 19. As the impeller revolves, the water or other fluid is drawn 1n through the inlet 9, and passes through that portion of the circular channel 11 outside of the wheel to the opening 20. I-Iere it enters the annular groove 15 in the impeller wheel, and a portion is caught by the blades 16 vand 'carried around. Thatl portion between the is moved in a channel in the casing. In

such instance there is friction on the three sides. In the present instance, however, the water travels with the wheel, and therefore does not meet with the friction which it would meet with if traveling through stationary walls of the casing. This results in a reater efficiency.

n `Figure 6, I.have shown a modified construction, in which the inlet opening, instead of being at the central portion of the casing, is disposed near the outlet. Thus in 'Figure 6, the outlet 10a has near it the inlet 9a, the outlet and the inlet'being separated by the abutment block 17. In this instance, the water, entering the inlet 9a, passes into the annular channel or groove 15 inthe impeller wheel, and is carried clear around to the abutment block before leaving the casing.

It is sometimes advantageous to have the water acted on in separate stages. To this end I provide the construction shown in Figures 7 and 8. Referring particularly to Figure 8, it will be seen that the casing 1 is provided with an inlet 21, and an outlet 22. The impeller wheel has two grooves which are shown at 15EL and 151j respectively, There are two portions of the impeller wheel, one in each groove. There are also two abutments. The water or other liquid enters the inlet 21, and passes into the channel 15a. Here it is carried around the channel until it meets the abutment block 17a (see Figure 2). It then passes through the opening 20 into the channel 15b, and is carried around in the channel 15b until it meets the abutment block 171 whence the water is forced out of the outlet 22.

In both formsof the device, that is to say, in the single stage pump, as well as in the 4 multiple stage pump, the water is carried around in the channel of the moving impeller, the friction on three sides thereby being eliminated. Since the power required to drive the pump is largely used in overcoming friction, it will be at once apparent that the reduction of the friction in this manner leads to great economy in the operation of the device, and a high efiiciency.

I claim: y 1. pump. of the type described, comprising a"cas1ng having'a cylindrical chamber,

an impeller Wheel mounted for revolution with said chamber, impeller wheel having a circumferential groo've or channel, and a series of bladesI carried ,by said impeller Wheel and disposed-within said channel, said blades extendino at right angles to the lane of revolution ofD the impeller wheel an terminating short ofthe outer edges of the groove. l l 'A 2. pump of the type described, comprising a casing having a cylindrical chamber, an impeller wheel mounted for revolution with said chamber, said impeller wheel having a circumferential groove or channel, a series of blades carried by said impeller wheel and disposed within said channel, said blades extending at right angles to the plane of revolution of the impeller wheel and terminating short of the outer edges of the groove, an inlet for conveying fluid to sai-d groove, an outlet, and means for deflecting the Huid from the groove through said outlet.

3. A pump of the type described, compris- 'ing a casing having a cylindrical chamber,

an impeller wheel mounted for revolution with said chamber, said impeller Wheel having a circumferential groove or channel, a series of blades carried by said impeller wheel and disposed within said channel, said blades extending at right angles to the plane of revolution of the impeller wheel and terminating short of the outer edges of the groove, an inlet for conveying fluid to said groove, an outlet, and means for deflecting the fluid from the groove through said outlet, said last named means comprising an abutment block secured to said casing and arranged to extend into said groove.

4. A pump of the type described, comprising a casing having a cylindrical chamber, an impeller wheel mounted for revolution with said chamber, said impeller wheel havingy a circumferential groove or channel, a series of blades carried by said impeller wheel and disposed within said channel, said blades extending at right angles to the plane of revolution of the impeller wheel and terminating short of the outer edges of the groove, an inlet for conveying fluid to said groove, an outlet, and means for deecting the fluid from the 'groove through said outlet, said last named means comprising an abutment block secured to said casing and arranged to extend into said groove and between certain of said blades.

5. A pump of the type described, comprising a casing having a cylindrical` chamber, an impeller wheel mounted centrally with respect to said casing for revolution therein, said impeller bein provided with a circumferential groove, lades carried by said impeller wheel within said groove, said blades projecting inwardly from both sidewalls of the' groove, the edges of the opposed blades being spaced apart, and the outer ends of the blades terminating short of the outer edges of the side walls of the groove, an inlet communicating with the groove and for delivering fluid thereto, an outlet in the casing wall, and a stationary abutment block carried by Vsaid casing and arranged to extend into the space between the side vwalls of the groove, and having a portion adapted to extend between the edges of the opposed blades.

6. A pump of the type described, connprising a casing having a cylindrical chamber, an impeller wheel mounted for revolution within said casing and having a plurality of circumferential grooves or channels, said casing having a passage-way for establishing communication between said grooves, an inlet communicating with one of said grooves, an outlet communicating with the other groove, a. stationary abutmentcarried by the casing and arranged to extend into one of said grooves for deflecting the fluid from said groove into the companionl groove,

and having a second abutment. carried by the casing and arranged to extend` into said last named groove for deflecting the fluid throu h said outlet.

7. pump of the type described, com= prising a casing having a cylindrical chamber, an impeller wheel mounted for revolution within said casing and having a plurality of circumferential grooves or channels, said casing having a passage-way for establishing communication between said grooves, an inlet communicating with one of said grooves, an outlet communicating with theother groove, a stationary abutment carried by the casing and arranged to extend into one of said grooves for deflecting the fluid from said groove into the companion groove, and having a second abutment carried by the casing and arranged to extend into said last named groove for deflecting the liuidthrough said outlet, and means carried by said impeller wheels within' the grooves for forcing fluid therethrough. 4

8. A pump of the type' described, comprising a casing having a cylindrical chainber, any impellerwheel mounted for revolution Within said casing andhaving aplu-Y rality of circumferential grooves or channels,

said casing having a passage-way for establishing communication between said grooves, an inlet communicating with one of said grooves, an outlet communicating with the other groove, a stationary abutment carried by the casing and arranged to extend into one of said grooves for deliecting the fluid from said groove into the companion groove, and having a second abutment carried by the casing and arranged to extend into said last named groove for defliectingthe iiuid through said outlet, and a. glurality of opposed blades extending inward y vfrom the side walls of each groove for forcing fluid through the grooves.

9. A device of the type described comprising a cylindrical chamber, an impeller wheel disposed in said casing, said impeller wheel having the same diameter as the inner diameter ofsaid casing and being spaced from the side walls of said casing, said impeller having a circumferential groove, a series of blades carried by said impeller and being disposed within said channel, said blades extending at right angles to the plane of the revolution of the impeller and terminating short of the outer edges of the groove, an inlet and an outlet extending radially from said impeller and'being disposed adjacent to one another, and a' block carried by said casing and projecting into said groove and being adapted to guide a Huid from said inlet into said groove and from said groove into said outlet.

10. A device of the character described comprising a cylindrical casing, an impeller lwheel carried by said casing, the periphery of said impeller rotatably engaging the peripheral wall of said casing, said casing having its side walls spaced from said impeller, sa1d .impeller having two circumferential grooves, a series of blades carried by said impeller and bein disposed within said channel, said bla es extending at right and a .passagecommunicating with said.

grooves, said blocks being adapted tol divert a uid from one 'groove to the other groove.

- REUBEN N. TRANE.

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