US3043229A

US3043229A - Twin volute pump

Info

Publication number: US3043229A
Application number: US27914A
Authority: US
Inventors: Jr Hubert C Atwood; John G Williams
Original assignee: Worthington Corp
Current assignee: Worthington Corp
Priority date: 1957-05-27
Filing date: 1960-05-09
Publication date: 1962-07-10
Anticipated expiration: 1979-07-10

Description

July 10, 1962 H. c. ATWOOD, JR., ETAL 3,043,229

TWIN VOLUTE PUMP Original Filed May 27, 1957 H u BERT QATWOOD TR;

JOHN G.W|LL|AM5 IN V EN TORS United States Patent 3,043,229 TWIN VOLUTE PUMP Hubert C. Atwood, In, Westfield, and John G. Williams,

Springfield, N.J., a'ssignors to Worthington Corporation, Harrison, N.J., a corporation of Delaware Original application May 27, 1957, Ser. No. 661,656, now Patent No. 2,955,540, dated Oct. 11, 1960. Divided and this application May 9, 1960, Ser. No. 27,914

2 Claims. (Cl. 103-103) Walled casings, but the splitter should remain thin for hydraulic reasons, and cost of metal involved.

In order to effectively cast a twin volute pump casing, it is imperative that the thickness of the casing and the splitter be substantially equal; the equality in thickness being necessary to prevent flaws in the casting, which flaws occur because of the unequal cooling time in a respective heavy casing and thin splitter cast integral therewith.

Casting the splitter as an integral part of the twin volute pump casing for a high pressure application presents other difiiculties; for example, twin volute pumps for high pressure applications undergo rigorous inspection tests such as a radiographic examination of the casting to determine whether there are flaws therein, searching through two separate layers of metal, as is the case in a twin volute having an integral splitter, not only detracts from the etficacy of the test, but also adds to the expense of such inspection.

In many cases the integral splitter fails during hydrostatic leak test. Failure results from the weakness in the casting at the point where the thin splitter joins the heavy walled volute.

Flaws detected during inspection of the casting are usually repaired, by a manner well known in the art. Howeventhe flaws so detected, due to the inaccessibility of certain portions of the casing which results from the splitter being cast integral therewith, sometimes cannot be repaired and as a consequence the casting is discarded.

Some installations require volute pumps capable of contending with extremely high pressures and, in addition, require a higher finish on the inner periphery of the casing, which finish cannot be obtained by the usual casting methods nor can the inner periphery of the volute casing having a splitter integral therewith be finished by other well known methods in the art.

Accordingly, it is an object of the present invention to obviate the foregoing difiiculties in the manufacture of heavy walled twin volute pumps.

It is another object of this invention to locate the splitter accurately and connect it securely to the pump casing.

With these and other objects in view, as may appear from the accompanying specification, the invention consists of various features of construction and combination of parts, which will be first described in connection with the accompanying drawings.

FIGURE 1 is a longitudinal section showing a twin volute pump construction embodying the principles of this invention.

FIGURE 2 is a section taken on line 22 of FIG- URE 1.

Referring more particularly to the drawings,.FIGUR E 1 shows the preferred form of, the heavy walled twm volute pump comprising a volute casing 1 of unitary construction, characterized by its spiral or scroll-like conformation and further provided with heavy walls generally designated 2 having an opening 20 communicating with chamber 21, in which an impeller 3 is rotatably mounted for pumping the liquid, from the axial Sucti inlet 4, formed in the front wall thereof, through discharge outlet 5.

One manner of associating the bootlike splitter is shown and it is not intended to limit the invention to this construction as other methods of association will be readily apparent to those skilled in the art. Thusly, the bootlike splitter 8 is shown as having side walls 11 and 12 which provide a U-shaped configuration and coact with the. casing to divide flow passingthrough the volute into the substantially

equal flow passages

6 and 7. a

An opening 22 is formed by the portion of the stripper disposed adjacent the suction inlet 4 and an opening 23 is formed by the portion of stripper 8 disposed adjacent opening 20 in the rear wall of the casing. It will be evident that opening 20 is formed, as shown in the drawings, to permit easy insertion and disposition of stripper 8 in operative position. The suction inlet 4 and

openings

20, 22 and 23 are shown as in axial alignment which facilitates assembly of the components of the pump.

Locater means taking the form of tapped holes 9 and drilled holes 10 are provided respectively in the walls of the casing 1 and accommodate the splitter in operable position.

In assembly the splitter 8 is disposed so that the walls 11 and 12 thereof are contiguous to the

walls

13 and 14 of the casing and openings 17 in wall 11 are aligned with the tapped holes 9. Similarly tapped holes 15 in Wall 12 are aligned with drilled holes 10. Bolt means 16 may then be inserted to connect the splitter 8 to the walls of the casing as above described to divide the volute casing 1 into two substantially equal portions.

With the provision of a separate splitter element applicant discloses a twin volute pump that is characterized by the substantial minimization of the problems hereinbefore mentioned. -It will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown, but that these may be widely modified within the invention defined by the claims.

What is claimed is:

'1. In a centrifugal pump of the twin volute type, a heavy walled casing of unitary cast construction having a front wall including a suction inlet, said casing including a peripheral wall having a discharge outlet, said heavy walled casing including a rear wall spaced from said front wall, said rear wall defining an opening in axial alignment with said suction inlet, impeller means disposed through the opening in said rear wall and being mounted in said casing for moving fluid from said suction inlet through said discharge outlet, an independent splitter element adapted for insertion as a unit through the opening in the opening defined by the rear wall of said casing and said independent splitter element including spaced side walls detachably mounted in said casing so that said spaced side walls are respectively contiguous with the front and rear walls of said heavy walled casing, said independent splitter element dividing the flow through said casing into two substantially equal portions prior to discharge, said independent splitter element of constant width and of lesser wall thickness than said heavy walled casing, first and second locater means on the interior portions of the front and rear walls of said casing, the side walls of said splitter element respectively disposed in abutment with both of the locater means, and means for rigidly detachab'ly connecting the splitter to said locater means to'maintain the splitter in operable position. a

2; In a centrifugal pump of the -twin volute type; a

heavy walled casing of unitary cast construction having a front wall includinga suction inlet, said casing include ing a, peripheral wall havinga discharge outlet, said casing including a rear wall spaced from said front wall, said' rear wall defining an opening inaxial alignment with said suction inlet, impeller means disposed through the opening in said rearwall and 'being mounted in said casing for moving fluid from said suction inlet to said ing defined by the rear wall of said casing and said independent splitter element including spaced side walls detachahly mounted in said casing so that said spaced side walls are respectively contiguous with the front and rear walls of said heavy walled casing, said independent split-,-

of tapped holes in the wall of the casing having said 25 suction inlet, a plurality of openings in the rear Wall of said casing, a plurality of openings in the periphery of the side wall of said independent'splitter contiguous V, to the front wall of said casing, tapped holes in the periphery of the side wall of said independent splitter contiguous to said rear wall, the openings in the side wall disposed to coincide with the tapped holes in the Wall of said casing and the tapped holes in the other side wall ofthe splitter disposed to coincide with the holes in the rear wall of the casing, and threaded members rigidly detachably'connecting the side walls of said spli ter in abutment with the inner portion of the front and rear walls of said casing at the tapped holes and openingsto maintain the splitter in operative position.

discharge outlet, an independent splitterie lement adapted for insertion as a unit. through the openingin the open- 15 References Citediin the file of this patent W UNITEDSTATES PATENTS, a 717,096 Harris Dec. 30, 1902 931,636 Neumann Aug. 17, 1909 1,390,391 Skidmore 'Sept. 13, 1921 1,745,854 Lawaczeck Feb. 4, 1930 2,042,550 Putter -4. June 2, 1936 2,399,548 V Ingersoll Apr. 30, 1946 2,661,698 Schellens Dec. 8, 1953 5 ,7 ,F OR EIGNVPATENT S 170,815 Great Britain Oct. 14, 1921 1943 556,853 Great Britain Oct. 25,