US2329373A - Pump - Google Patents

Description

Sept 14, 1943. HHQRNSCHUCH 2,329,373

PUMP

Filed Aug. 20, 1942 2 Sheets-Sheet 2 v u N i; :a

Q Q t :z5 n 0o A m \o\ n 32 Q u :gie e n QN lh -o b 2f) g Q E v E gg 25 E VB f k xq q n INVENTOR k Hann/sHP/zac'zzdb HIS ATTORNEY.

Patented Sept. 14, 1943 UNITED STATES PATENT oFFlcE PUMP Hanns Hornschuch, Easton, Pa., assigner to Ingersoll-Rand Company, New York, N. Y., a corporation of New Jersey Application August 20, 1942, Serial No. 455,397

2 Claims.

This invention relates to pumps, and more particularly to centrifugal pumps of the multi-stage type.

It is an object of this invention to provide an economical form of balanced multi-stage pump.

Another object of the invention is to provide a pump in which the volutes of the pump are so arranged that the pressures within the volutes, developed by certain impellers, are partly counterbalanced by the pressures on the outside developed by the other pump stages. The result of this arrangement is that the metal in the casings can be relatively thin, thereby effecting a very material saving in the cost of the pump.

Another object of the invention is to produce a relatively simple form of pump capable of being readily dismantled and accessible for repairs.

Other objects and advantages of the invention will be in part obvious and in part pointed out hereinafter.

In the drawings showing a preferred embodiment of the invention and in which similar reference characters refer to similar parts,

Figure 1 is a side elevation of a pump, .constructed in accordance with the practice of the invention,

Figure 2 is an elevation looking at the inlet end of the pump of Figure 1, and

Figure 3 is a longitudinal vertical section along f the line 3 3 of Figure 2 looking in the direction of the arrows.

Referring to the drawings, the pump is provided with an outer casing formed in two parts I0 and II, generally cup shaped and joined together at peripheral flanges I2 and I3 formed integrally with the casing halves I0 and II respectively.

Within the casing formed by the two halves I6 and Il is rotatably supported, a shaft I4 upon which are keyed or otherwise suitably mounted the impellers I5, I6, I1 and I8 which, in the order named, are the first, second, third and fourth stage pressure producing elements. Such impellers are formed with any suitable type of blading, as is well known to those skilled in the art of centrifugal pumps. In this instance, the forces acting on the impellers balance because of the alternate'facing of the impellers with respect to each other.

The shaft I4 is provided at its ends with bearings I9 and 20 of any suitable description. The

bearing I9 is formed integrally with a bracket 2l supported on a lateral extension 22 of a stung box 23. Likewise, the bearing 20 is provided with a bracket 24 supported by a lateral extension of the stufiing box 25.

At its outer extremity, the casing half I0 is provided with a cylindrical aperture 26 to receive a corresponding cylindrically shaped portion 21 of the stuflng box 23, held in place therein by means of bolts 28. The joint so formed is rendered lluid tight by a suitable' gasket 29 compressed by tightening the bolts 28.

The impellers I5, I6, I1 and I8 are mounted on shaft I4 in any suitable manner, preferably being held in proper spaced relationship by spacers as, for instance, between impellers I5 and I8 there is provided a spacing sleeve 30 and between impellers I6 and I1 a similar sleeve 3|.

At the inlet side of the impeller I5 is provided a spacer 32 and a shaft sleeve 33 held in place by suitable nut 34, packing being provided betweenthe'shaftsleeve 33 and the spacer 32 as shown at 35. Similarly, at the inlet side of the impeller I6 is provided a spacer 36 and a shaft sleeve 31 held in place by a nut 38, packing being provided as shown at 39.

Packing 43 is provided for the shaft within a suitable recess 40 and is compressed between the flanged bushing 4I and a gland 42. In this instance, the shaft packing 43 is of the metallic type.

'Ihelcasing half II is provided with a stufling box 25, in this instance exactly like the stuing box 23 and the shaft I4 at the adjacent portion and may be packed in exactly the same fashion at the opposite end of the casing. Accordingly, the casing half II is provided with an aperture 45, also preferably cylindrical as is the aperture 26. It will be noted that the aperture 45 ls of sufcient diameterto permit withdrawal of the lmpeller I6 therethrough. Likewise, the aperture 26 is of sufficient size t6 permit the passage Ytherethrough of the linpeller I5.

communicates with an internal passageway 48 having a wall 49 formed integrally with the casing half I0 and extending about the shaft I4. In the wall 49 is provided a stepped bore 50 to receive the complementary stepped periphery of an internal Wall or ring 5I formed integrally with the stuffing box 23 and supported thereon by webs as shown at 52. Within the ring 5i is a bore 53 forming a running iit with the impeller I5 to prevent leakage of uid under pressure back into the inlet passage formed in the stufng box 23 by ring 5I.

An additional wall 56, preferably also formed integrally with the casing half i6 forms with the outer wall a chamber' 55, into which fluid is adapted to be discharged from the volute 56 associated with impeller I5. The chamber 55 extends into the casing half Il where it is formed by the outer wall of that casing and inner wall 55 formed integrally therewith. Chamber 55 communicates, with the inlet of the second stage impeller I6, which is also provided with a volute 5l leading toa chamber 58 within the wall 56.

Chamber 58 is bounded by diaphragm 59 cast integrally with wall 56 and a second diaphragm 6U, also formed integrally with that wall. Chamber 58 communicates with the inlet of impeller II which is provided with a discharge chamber 6I associated with the volute 62 for the impeller II and also with the inlet of the impeller I8.

Chamber 6I is completely inclosed within the walls 56 and 54 so that the pressure within the chamber 6| is partly counter-balanced by the external pressure in chamber 55. Volute 63 of the last stage impeller I8'is likewise completely inclosed within the chamber 6| and is adapted to discharge through an aperture 63 associated with the discharge connection 41 by means of a passageway 54 cast integrally with the casing half I6.

It Will be noted that to provide access to the impeller I8 a removable diaphragm 65 is provided between the impellers il and i8, it being held in place by suitable studs 66.

The pump is preferably mounted on a base plate 6l' there being suitable laterally extending arms 68 provided on the casing half lll supu ported by pedestals 86. A dovvel 69 locates the casing laterally and longitudinally with respect to the base plate 6i.

Expansion of the pump casing is permitted and the out-board end of the pump is steadied by an upright flexible plate member l0 attached to the base plate 6l by means of a suitable foot piece 1I and also attached at its upper end to the sturiing box by a suitable stud 72.'

In the making of casing halves it and il the chambers 55, 5t and 6I are cored and the walls thereof are therefore supported by suitable webs 82 for the sake of rigidity.

The hereinabove described arrangement is especially suitable for service such as pumping I hot oil, or where the pump has-t0 be occasionally dismantled either for cleaning or replacement of parts. It will be noted that the pump can be completely dismantled without removing the casing half ID from the base and without disturbing the external connections tothe inlet and discharge nozzles 46 and 4l.

Upon removal oi' the bearing 2B and the adjacent shaft packing, the stuffing box 44 can be removed to provide access to the impeller I6. This will permit removal of the lmpeller 6 and, if desired, the entire casing half il may be re'- moved by unbolting at the flanges I2 and i3.

Access to the impeller I8 is provided by removing the studs G6 which hold the diaphragm 65 in place, whereupon that mpeller may be withdrawn from the shaft. Likewise, the stuffing box 23 may be removed through the aperture 26 and, if desired, the impeller I5 may be pulled from the shaft through the aperture 26 and the shaft removed in the opposite direction,

A still further advantage of this construction is the lightness of the casing. It will be noted that the chamber 55, which acts as a transfer passage from the rst 'stage impeller I5 to the second stage impeller I6 almost completely incloses the passageways associated with the other stages. II may, therefore, be of relatively thin section. Furthermore, the shaft packings are not subjected to extremely high pressures and are relatively easily maintained tight.

The inner walls, as for instance 56' and 54, may also be constructed of relatively light sections, since the outer pressure in the chamber 55 counter-acts the inside pressure to a considerable degree. Furthermore, the chambers 58 and 6I are relatively smaller, which also tends to permit lighter wall sections. The same principle is carried still further by the inclosure of the volute or diffusor 62 within the chamber 6I. Thus the highest pressure, which is within the volute 62, is minimized in its effect on the Walls of the volute by the relatively counter-balancing high pressure in the chamber 6|. There is provided a succession of higher pressures from the outside to the interior, the highest pressure being contained in a chamber surrounded by pressure uid from the next highest stage.

I claim:

1. In a pump, a series of impellers arranged in pairs symmetrically with respect to a central plane, a shaft for supporting said impellers, a casing housing said impellers and vertically split adjacent said plane, and shaft stuffing boxes removable from the ends of said casing to permit removal of the outer impellers from the casing, said casing being provided with a passageway to conduct fluid between the outer two impellers and enveloping the inner impellers, said stufling boxes being provided with passageways forming inlets to said outer impellers.

2. In a pump, a series of impellers arranged in pairs symmetrically with respect to a central plane, a shaft for supporting said impellers, a casing housing said impellers and vertically split adjacent said plane, shaft stufng boxes removable from the ends of said casing to permit removal of the outer impellers from the casing, said casing being provided with a passageway to conduct fluid between the outer two impellers and enveloping the inner impellers, said stufling boxes being provided with passageways forming inlets to said outer impellers, and a central diaphragm in a face of one half of said casing removable to permit withdrawal of one of said inner impellers therefrom.

HANNS HORNSCHUCH.

The outer walls of the casings I 0 and.

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