US1645498A

US1645498A - Centrifugal pump

Info

Publication number: US1645498A
Application number: US166390A
Authority: US
Inventors: Jr Augustus C Durdin
Original assignee: Chicago Pump Co
Current assignee: Chicago Pump Co
Priority date: 1927-02-07
Filing date: 1927-02-07
Publication date: 1927-10-11
Anticipated expiration: 1944-10-11

Description

Oct. 11, 1927.;

A. c. DURDIN, JR

CENTMFUGAL PUMP Filed Feb. '2. 1927 vn for:

Patented lOct. V11, 1927.

UNITED STATES N N 1,645,498 PATENT OFFICE.

aUeUsrUs c. DURDIN, Jn., Or cnrcaeo, ILLINOIS, AssIeNon v'ro cmcaeo ruin COMPANY, Or CHICAGO, ILLINOIS, A CORPORATION Or ILLINOIs.

oaN'rmUGAL rUnr.

Application med February 7, 1927. Serial No. 166,390.

This invention relates to centrifugal pumps and more particularly to the impel-` y1ers thereof, and its principal object is to simiplify and otherwise improve upon the construction upon such parts of centrifugal pumps. 'lhe invention concerns centrifugal pumps of the type used for ejecting sewage or drainage water, or for ejecting liquids which contain hard substances, trash, litter, blocks of wood, stone, semisolid materials and so forth, `which cannot be handled by the ordinary centrifugal pump because of .the danger of injury tothe parts thereof and because of the danger of the pumpbecoming clogged. Another object of the present invent'ion is to increase the capacity: of centrifugal pumps fof this type and to reduce toy a minimum the formation of eddies in the volute part of thepump, which are of common occurrence and interfere withthe eili-y cientoperation ,of vthe pumps. lAnother ob.-

ller which may ject is to provide a centrifugal pump impelbe cast in one piece and which does notreq'uilre the use of complicated sand cores in the casting thereof. f

4With these ends in view, this invention consists in a centrifugal pump impeller hav ing a vane or Vanes of substantiall uniform thickness and cross section throug out their length, and each having a rounded, relatively wide forward end and formed with a reentrant part behind the rounded forward end, whereby articles, 4having a eater length (within given limits) than the 'ameter of the eye of the impeller, may freel pass through the impeller and' be yeject from the pump. The invention further consists in the several novel features yhereinafter fully set'forth and claimed.

The inventionis clearly illustrated in the accompanying drawing, in which:

Fig. 1 is a front elevation of a centrifugal pump impeller embodyin a simple form] of the present invention ;l ig. 2' is a vertical section thereof taken on .a planel parallel with the front of the impeller seen 1n Fig. 1;.Fig. 3 is a cross section taken on the line 3-3 ofFig. 1 and Fig. 4 is a cross section taken on the line 4--4 of F 1.

Referring to said drawing, which illus tratesa simple embodiment of the present invention, the `reference .character 5 designates a vane supporting member, here shown` in the form of a circular wall or plate, having on one side a hub 6 in which is secured vane isl of substantially uniform.' thickness Y and cross section throughout its entire length, although at the sides thereof where 1t "jolns the

walls

5, 7, llets 10 are formed between the vane and walls, which llets increase the thickness' somewhat at these places, but add strength and rigidity to the whole structure-and prevent the gathering 'Il of trash and other material in the corners between the vanesand walls.

Each vane is given a lform somewhat in -the nature of a volute or spiral, commencing at the forward end with a rounded art' 11, which is preferably semicircular in orm and extendsfrom a point adjacent, but outside of the eye 8 of the impeller tol a oint well within the Inargn;orl periphery o the

walls

5, 7. From the'semicircular forward end 11, each vane extends in a curvilinear manner as at 12 toward the peripheries of

ils

5, 7 where the part 13 of' the Outer face Of-the vane is made concentric with the axis fof theim 11er` and coincides with lthe peripheries of t e walls. Said part 13 extends along the eriphery of the impeller for' a considera le distance, in fact good results are obtained with the vane extendin along the periphery of the impeller throug an arc of sixty degrees or` thereabouts. At the rear or discharge end 14 the edge portion offeach vane may thin out to a.V relatively sharp edge if desired, the inner face of each vane being beveled vor curved outward toward the outer side as shown in gt will bexobserved that the curved for- 'ward ends 11 of the vanes are relatively i by making said forward ends ofl widely Y freely pass through the space between the vanes. Sticks, blocks `of wood, stones and So forthwhich are relatively long as comared with their diameter are not likely to e caught between the vanes but may ass .0n through the impeller thereby avoi. ing` the clo gin of the pump. It will h understood to those skilled in the art to which this invention pertains,

that a. pump case encloses the impeller and as usual said case takes a volute Y form.

around the impeller. Because of the paral-` lel relation of the inner and outer faces of the vanes,l and because a large part of thev rear ends of said vanes are .concentric with the axis of rotation of the' impeller, the water in traveling through the pump may substantiall follow said parallel lines, so that as the bodies of water on both sides of each' vane come tovether at the rear end of each vane, but little disturbance is created between the meeting bodies of water, since they are flowing substantially in the same direction. The result is that 'practically no eddies are created and the efficiency of the pump is thereby greatly increased. The curvature given to the vanes is suitable for the purpose of impelling the water, together with the foreign substances contained therein, throu thereto, orce applied to the pump, thereby increasing the velocit of theiwater. Furthermore by reason o the shape and disposltion ofthe vanes, the entire lmpeller may be cast in one piece-without any core ockets in the vanes,` from which the san `cores must be removed. The impeller isofa form which may be easily machined, is light, substantial and strong, and capable of long continued usage.

More or less variation of the exact details of construction is possible without .departlng from the spirit of this invention. I desire, therefore, not to limit myself to the exact' form of the construction shown and descrlbed, but intend, in the following claims, to point out all of the invention disclosed herein.

I claim as new, Letters Patent:

1. In a centrifugal pump impeller, a vane and desire to secure by of uniform thickness throu hout, formed at its forward end with a U end to provide a rounded and relatively wide impact end,

h the pump and of transmitting the remainder zof ythe vane beyond the U bend extending in a curvilinear manner from v a point within and spaced away from the circumference of the impeller to one on its periphery, and thence part way along the periphery on a concentric path.

2. In a centrifugal pump impeller, a vane of uniform thickness throughout, formed at` its forward end with a U bend to provlde a'y rounded and relatively wide impact end, the remainder of the vane beyond the U bend extending in a curvilinear manner from' a point within and spaced awayy from theclrcumference of the impeller to one on its periphery and thence extending part way in a concentric path, along its periphery to its rear end.

3. In a centrifugal pump impeller, the

combination of a pair of parallel, circular vane supporting walls, and a vane extending from wall to wall, said vane being of uniform thickness throughout and formed at its forward en'd with -a U bend to provide a rounded and relatively wide impact end, thev remainder of said vane extending in a curspaced away from the circumferenceof the impeller to one on its periphery, and thence part way along the periphery in a concentricpath.

vilinear manner from a..point within and ios 5, In a centrifugal pump impeller, a vane of uniform thickne throughout and provided with a convexly rounded forward end, the vane extending in a curvilinear manner from a point within and spaced away from the circumference of the impeller to one on its periphery, and thence part way along the periphery on a concentric path.

6. In a centrifugal pump impeller, a vane of uniform thickness throughout and provided with a convexly rounded forward end, the vane extendigig in a curvilinear manner from a point wi hln and spaced away from the circumference of the impeller to one on its periphery and thence extending in a concentric manner along the eriphery of the impeller to its rear end, t ere beings. reentrant portion on the inner side of the vane behind said convexly rounded forward end.

7. In a centrifugal pump impeller a vane provided with a convexly rounded forward part located within and spaced away from the periphe of the impeller,l and having a part of uni omi thickness, extending fromy said conveXl rounded forward part to the periphery o the impeller in a curvilinear manner, and thence part way along'l :the periphery on a concentric path. f

8. In a centrifugal pump impeller, ya vane provided with a convexly rounded forward part located within and s aced away Afrom the periphery of the impe er, andhaving a part of uniform thickness, extending from said convezrly rounded forward part tothe periphery of the impeller in a curvilinear manner and thence in a 'concentric manner toits rear end. l

9. In .a centrifugal pump impeller, the combination of a circular vane` supporting wall. and a vane supported thereby and pro vided with a convexly rounded forward part and having a. part located within and s aced 20 away from the` periphery' of the impel er of` uniform thickness, extending from said con` vexly .rounded forward part to the periphery of the impellerl in a curvilinear manner, and thence part way along the periphery on a concentric patin 10. In a centrifugal combination of a circular vane sup ortin wall and a pair of varies supported 1y sai wall. and each provided with a` convex y forward part and having a part located within and spaced away from the periphery of the impeller of uniform tlnc mess extending from said convexly rounded forward part to the periphery of the impeller in a curvilinear manner and thencein a concentric manner along the periphery of the impeller.

AUGUSTUS C. EURDIU9 Jn.

purnp impeller, the y