US2375802A - Pump construction - Google Patents

Description

y 1945- c. l. LONGENECKER 2,375,802

PUMP CONSTRUCTION Filed May 28, 1942 2 Sheets-Sheet 1 I I 5&9.

I CHA'RLES LLONGENECKER, 5- 4 w,

May 15, 1945.

LONGENECKE R PUMP CONSTRUCTION 2 Sheets-Sheet 2 Filed May 28, 1942 CHAS. l- LONGENECKER,

PUMP CONSTRUCTION Charles I. Longenecker, Wauwatosa, Wis., assignor to Chain Belt Company, Milwaukee, Wis., a corporation of Wisconsin Application May 28, 1942, Serial No. 444,891

1 Claim.

The invention relates to pumps, and more particularly to centrifugal self-priming liquid pumps of the general type referred to in prior U. S. Patents No. 1,989,061 granted January 22,

1935; No. 2,022,624 granted November 26, 1935;

and No, 2,217,380 granted October 8, 1940; and it has for one of its principal objects the provision of an exceptionally light weight pump constructed largely of sheet metal to facilitate portability but which at the same time will withstand wear remarkably well when handling dirty or gritty liquids, and which can be quite easily disassembled and reassembled for inspection and/or repair in case of necessity.

With the above and other objects in view which will appear as the description proceeds, the invention resides in the novel details of construction, parts and combinations of parts more fully hereinafter described,

In the accompanying drawings forming part of this specification, in which like reference characters designate like parts throughout the views, one form of the invention has been illustrated for purposes of disclosure, but not necessarily of limitation, in accordance with the requirements of the patent statutes.

In the said drawings:

Figure l is an end elevational view of a pump constructed in accordance with the invention, with a prime mover such as a small internal combustion engine associated therewith for driving Figure 2 is a side elevational view, on a slightly larger scale and with a portion of the pump body or casing broken away and in section, of the pump shown in Figure 1, as seen from the left of said figure;

Figure 3 is a central sectional view,- taken approximately on the plane indicated by the line 3-3 of Figure 1, looking in the direction of the arrows;

Figure 4 is a sectional View taken approximately on the planes indicated by the line 44 of Figure 2, looking in the direction of the arrows;

Figure 5 is a similar view taken approximately on the plane indicated by the line 5-5 of Figure 2; and

Figure 6 is an expanded perspective view, partly in section, illustrating the several elements and subassemblies of the pump in their relative positions or order in assembly or disassembly.

Referring more particularly to said drawings the pump as hereshown comprises a casing or body H) constituting a delivery and priming water chamber and having a pair of spaced heads or end members H and I2 which are preferably formed by stamping or drawing disks of sheet metal to provide peripheral flanges l3 and I4 respectively. The said heads are spaced as shown and their flanges l3 and M are surrounded by a sheet metal strip or ring l5 which is welded at its edges to the said flanges as indicated in the drawings, Angle members 16 and I! each have one of their legs welded to the stri l5 while their other legs are welded to a bridge member I8 and constitute a foot or base for the pump as will be readily understood, and an outlet tube or pipe 20 extends through the ring member 15 at its upper part, being welded thereto and communicating with the chamber within the casing to constitute a conduit through which the liquid is discharged from the pump. This outlet conduit is preferably provided with an angularly disposed branch 2| normally closed by a threaded plug 22, which branch is utilized for the introduction of water into the casing chamber to initially prime the pump before starting it into operation.

An impeller chamber 24 is also provided within" the casing Ill, being carried in whole or in part by the head I 2 and comprising a strip of sheet metal 25 curved to spiral or volute form and having one end 26 welded to the flange 14 of the head I2. Said strip is also welded along one edge to the head l2 throughout substantially its entire length while its other edge is welded to a vertical partition plate 21 positioned substantially in the plane of the inner edge of flange l4, as will be clear from Figure 3. The said plate 21 is provided with a central opening 28 through which the liquid may enter the impeller chamber 24; and an annular flange 29 is welded or otherwise rigidly secured to the said partition wall for a purpose to be later described.

The head or end plate I2 is provided with a relatively large circular opening 30 through which the pump impeller 3| may be introduced into the impeller chamber 24, as will be readily understood from Figures 3, 5 and 6. The said impeller as here shown comprises a sheet metal disk 32 welded to a central hub 33 and having a plurality of impeller blades 34 edge welded thereto as will be clear from Figures 5 and 6. The hub 33 is threaded or otherwise detachably secured upon a shaft 35, here shown as being the end portion of the power shaft of the internal combustion engine E illustrated in Fig, 1. The said shaft extends through a member 36, constituting a portion of the frame or casing of the said engine, and through a tubular housing 3'! which has the annular flange members 38 and 39 welded to its respective ends. The flange 38 is of suiflcient diameter to close the opening 36 in the head l2 and is normally secured in posi-' tion thereover by nuts and bolts 453, the latter of which are tack welded to the head (2. A bushing 4| is pressed into the tubular housing 31 and carries the stationary member 4! of a sealing structure, which also includes a rotatable sealing ring 42 engaging the end face of the member 4| and driven by the bent arm 42' [from the impeller plate 32, see Fig. 3. A packing ring 43, of rubber, fibrous or other suitable material, also surrounds the shaft 35 and assists in preventing the escape of water from the pump and grease or other lubricant thereinto. The flange 39 is secured to the engine frame member 36 by screws or bolts 44.

The opposite head I I of the pump casing is also provided with a relatively large central opening 45 which is normally closed at least in part by the disk 46 of an inlet valve assembly, such disk being detachably secured in place by nuts and bolts 41, the latter of which are tack welded to the head II to be permanently carried thereby. The disk 46 has an inlet conduit or nipple 48 welded to its central ortion, extending outwardly therefrom; and a second conduit 49 is welded to and extends inwardly from its opposite side. This last tube or conduit constitutes a support or seat for an inlet check valve 50 of the fiat type, which is secured to and supported by a strut welded to and rigidly carried by the member 49.

Surrounding the inlet check valve 50 is a tubular member 55 which extends from the disk 46 of the inlet valve assembly to the annular flange 29 carried by the partition wall 21; as clearly indicated in Figs. 2 and 3. The inner end of this member 55 has a sliding fit upon said flange 29 and a rubber or other resilient washer 56 is interposed between the end face of the member 55 and the partition wall 21, as will be readily understood from Figs; 3 and 6.

The tubular member 55 constitutes a conduit for conducting the incoming liquid from the valve 50 to the inlet port 28 of the impeller chamber 24. and it also serves to support a valve for controlling the admission of priming water from the delivery and priming water chamber to the inlet port 28 of the impeller chamber. That is to say, the said member 55 is provided with a laterally extending passage 60 having a port 6| affording communication between the delivery and priming water chamber and the interior of the member 55, which port is controlled by a priming water valve 62, which is or may be of the type disclosed and claimed in the prior U. S. Patent No. 2,217,380 referred to above.

As best shown in Figs. 4 and 5, the end of the volute strip 25 opposite its rigidly attached end 25 is preferably folded back upon itself as indicated at 65 and has removably attached to it, as by the screw 66, a peeler element 61, the sharpened edge 68 of which co operates with the periphery of the impeller 3| in a manner fully disclosed in the prior U. S. Patent No. 1,989,061 mentioned above.

With the exception of the member .55, which is here shown as a casting, the various other tubular elements heretofore described preferably take the form of short sections of standard seamless pipe, which are not only relatively inexpensive but also lend themselves quite well to the welding operations whereby the various .disks and other members are rigidly secured to them. They are also quite resistant to wear and thus contribute to the long life of the pump.

As will be best understood from Figure 6 the casing I I] is constructed by encircling the .fianges I3 and I4 of the spaced heads II and I2 with the strap or ring member I5, which is then welded in place. The volute chamber 24 is preferably constructed on the head I2 before it is assembled chamber; a rigid as just described, by welding the flange 29 to the partition plate 21, welding the end 26 of the volute strip 25 to the flange I4 of the head, and edge welding the said strip .to the head, after which the partition member 27 may be welded to the other edge of the said strip. The members I6, I1 and I8 are welded together and to the outside'of the casing to constitute the base or support for the pump, and the outlet conduit ZIlis positioned and welded in place.

, The impeller assembly is assembled as a separate unit, as is also the inlet check valve assembly, and the tubular intake conduit 55 and its priming control valve 62. With the various subassemblies thus completed the pump may be completely assembled by introducing the impeller 3| through the'opening .30 in the head I2 and securing the flange or disk 38 of the impeller assembly housing to the head by means of the screws and nuts 40, a packing gasket or washer 69 being preferably interposed between the said disk and head.

The packing washer 56 is then introduced through the opening 45 in the head II and positioned on the flange 29, whereupon the tubular member 55 is likewise inserted through the opening 45 and its end engaged upon the said flange 29 which serves as a positioning guide and support therefor. The inlet check valve assembly is then brought to position and its disk 46 secured to the head II by the nuts and bolts 41, a packing gasket 10 being interposed between the parts as will be readily understood. This gasket is pressed against the adjacent end of the tubular member 55 as the nuts on the bolts 41 draw the disk 46 home and firmly presses the said tubular member against the sealing gasket or washer 56, thus retaining the said tubular member in the operative position shown in Figure 3.

If desired the head II may be provided with a short sleeve II to provide a drain opening for the pump chamber, which opening will of course be normally closed by a plug 12.

It will be clear from the foregoing that the present pump is constructed for the most part of sheet metal elements, and of standard seamlesspipe sections and it is therefore not only relatively inexpensive to manufacture but is highly resistant to wear and very light in weight so that it may be readily transported from place to place.

Having thus described the invention what is claimed is:

In a light-weight pump of the rotary self-priming type: a, sheet metal casing having a pair of spaced heads, a volute strip secured to and projecting inwardly from one of said heads, and a thin partition plate secured to the inner edge of said volute strip and in conjunction with the latter. dividing the interior of the casing into an impeller chamber and a priming-liquid chamber, said plate having an inlet port for said impeller chamber; an impeller in said impeller flange carried by said partition plate surrounding said inlet port and extending into the priming-liquid chamber; an inlet and priming-liquid conduit having one end removably seated on said flange, said conduit extending from the flange to the other head of the casing; and

an inlet valve assembly detachably secured to the last mentioned casing head and engaging the adjacent end of the inlet conduit to press the latter home and maintain it in position of the flange.

CHARLES I: LONGENECKER.

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