US2190443A - Sealing means for rotary shaft openings - Google Patents

Description

Feb. 13, 1940. c. B. DALzlezLl. ET A1. 2,190,443v

SEALING MEANS FOR ROTARY SHAFT OPENINGS Filed Jan. 2o, 1938 s nees-sneet 1 llh Awww/5x5 Feb. 13, 1940. c. B. DALZELL ET AL l SEALING MEANS FOR ROTARY SHFT GPENINGS 2 Sheets-Sheet 2 Filed Jan. 20, 1938 Petenred Feb. 13, 1940 UNITED 'STATES- SEALING MEANS Fon ao'raar SHAFT orENmGs -Y charles n. neuen, male raus, ana nalpn x.

Miner, Oriskany Falls, N. Y., assignors to Cherry-Burrell Corporation, Chicago, Ill., a corporationy of Delaware Application January zo, 193s, serial No. 185,916

1o claims. (c1. ess-11) This invention relates to pumps and the like. having means for sealing the .openings through which the rotary pump shafts pass out of the pump casings, and particularlyto improvements 5 in pumps lwhich are used for handling liquids, I

.such for example, as milk, and have to be frequently taken apart'or disassembled for steriliz- A ing or cleaning all parts thereof, including the sealing means, with which the liquid contacts to l keep the pumps in proper sanitary condition.

The objects of the invention are to provide a novel and improved pump or the like construction having efficient sealing means `for the rotary shaft opening thereof, which will enable quick l and easy disassembling and asembling of the parts; also to provide elcient pump sealing.

means of simple and inexpensive but durable construction which are adapted to operate dry or without liquid lubricatiomwhich will elciently 4seal the shaft opening and reduce the wear due to end thrust on relatively'movable'parts; and which have the other features of improvement and advantage hereinafter described and set forth in the claims.

In the accompanying drawings:

Fig. 1 is a longitudinal, sectional plan view of a centrifugal pump provided with sealing means embodying the invention.

Fig. 2 is a transverse, sectional elevation there- .30 of on line 2-2. Fig. 1.

'45 trated in the drawings, see particularly Fig. 1,

comprises a pump casing orcylinder I0 provided with a peripheral liquid discharge connection II,

a removable outer head orcover I2 provided with a central liquid inlet connection I3, a rotary pump 50 shaft I4 extending out of the casing through a -shaft opening I5 in the innerfend wall of the casing, and a rotor or impeller I6 in thel pump casing on the inner end of the pump shaft. The l cover I2 is removably secured in place to close 3 the outer end of the casing, as by a yoke Il on which the cover is pivotally mountedA at I'Ia, and which is suitably hinged at one end at I8 on one side of the pump casing, 'and is adapted to be forced inwardly to secure the cover tightly in closed position against a sealing gasket at the outer endvof the casing, as by a screw I9y hinged on the opposite side lof the casing and provided with a wing nut I9a adapted to engage the free end of the yoke, which is slotted to releasably re' ceive the screw. By unscrewing or loosening the 19 nut, the yokejand cover carried thereby can be swung outwardly to open up the pump casing. The impeller IB shown-consists of a nat blade or plate removably seated in a diametrical slot 20 in the inner end of the pump shaft so that when the cover is opened, the impeller can beI removed simply by pulling it out of the shaft slot. A notch is shown in` the inner edge of the impeller blade 4to receive the portion of the shaft at the inner end of the shaft slot to prevent radial dis- 2 placement of the impeller.

Preferably the pump casing is detachably mounted on a base 2| so as to permit its ready dismounting and the removal of the pump shaft, for which purpose, in the canstruction shown, the casing is provided at its inner end with outwardly projecting xed studs 22 removably secured in holes'23 in an upright xed support or part 24 of the pump base. 'I'he studs may be removably secured in the holes 23 by any' suitable means, 30 such as taper pins 25 passing through diametrical holes in the studs 22 at and engaging the outer end of the support 24. .The taper pins shown are provided with laterally projecting upper ends to facilitate their insertion and removal. By driv- .35 ing or forcing the pins tightly into the holes of the studs, the latter are drawn inwardly and draw the pump casing tightly up against the adjacent face of the support.

The pump shaft passes through a preferably 40 cylindrical opening 21 extending through the su pport 24 and is detachably or removably connected at its outer end to a motor shaft or other drive element 29. As shown, the pump shaft I4 extends through `a bearing sleeve or bushing 45 fixed in a second standard 3l on the pump base, and its outer end has a driving connection with one member 32 of an ordinary/flexible coupling, the other member of `which is fixed on the drive shaft 29. The driving connection between the pump shaft and the coupling may be formed by providing-the end portion of the pump shaft with a fiat side face 33 arranged to engage acomplementary flat face or key 34 in the hub of the coupling member 32. When the pump casing is unfastened and removed from the support 24, this connection between the pump shaft and the drive shaft permits the pump shaft to be pulled endwise out through its bearing 30 aand the opening 21 of support 24 on the pump base.

The described construction of the pump, that permits ready disconnection and removal or disassembly of its parts, including the pumpl shaft, to facilitate cleaning them, is shown and described herein to give a clear understanding of the construction and arrangement of the sealing means, which also are constructed and arranged to enable'ready removal or disassembly of the parts of the seal in'order that these also may be quickly and thoroughly cleaned. However, the sealing means are applicable to pumps and the like of other constructions.

The sealing means `comprise a flexible elastic sleeve or ring35 which 'surrounds the pump shaft, and a sealingbody 36 also surrounding the shaft and leld by the elastic sleeve in sealing contact with a complementary sealing part or face. In the embodiment shown in Figs. 1 to 4, the elastic sleeve surrounds the pump shaft lwithin the opening' 21 in the support 24 between a fixed collar 31 on the pump shaft and the outer end face of a central integral boss 36 on the end wall of the pump casing which projects into the inner end of the opening 21. In this embodiment the sealing body 36 is in the form of a separate ring or washer'arrangedbetween the end of the boss 38 and the inner end of the elastic sleeve. When the. pumpl casing is drawn up tight against the inner end of the support 24 by its taper pins or` end of the opening 21, thereby preventing foreign' matter from easily entering into the opening A`2`| wherein it may contact the sealing element when the pump is assembled. The elastic sleeve andV4 sealing body are loose on the shaft and inthe opening 21, which forms a sealing or protecting chamber. In this arrangement, the elastic sleeve and sealing body tend to rotate with the shaft, the sealing body running in sealing contact with the end face of the casing and being compressively sealed against the adjacent face of the elastic. sleeve which in turn is compressively sealed at its opposite end against the collar 31 on the shaft I4.

Instead of this arrangement of the sealing ring 36 between the elastic sleeve and the end of the casing, the parts can lie-reversed as shown in Fig. 6, with the sealing ring 36 arranged between the outer end of the elastic sleeve and the collar 31 on the shaft, in which ,case the elastic sleeve tends to remain stationary andhold the vsealingring stationary against the end face of the shaft collar 31, which rotates. In some respects this arrangement with the sealing body body or ring of carbon or graphite has been found satisfactory and efficient for. the purpose.

ving faces.

If desired, two sealing rings or bodies 36 could be provided at opposite ends of the elastic sleeve,

one between the sleeve and thev shaft collar 31 and the other betweenv the opposite end of the sleeve and the end face of the pumpv casing, but the duplication of the sealing bodies has not been found necessary.

In the embodiments of the invention above described, the sealing body 36 is formed by a ring,

1 washer orA gasket separate from the elastic sleeve or ring, but if desired, the seal could be formed by. a nexible elastic sleeve or ring made with an integral or permanently attached sealing body or' hardened end portion adapted to be held by the flexible elastic portion of the sleeve or ring against the complementary sealing face on the pump casingor shaft. Such a. construction is illustrated in Fig. 7, in which 46 represents the exible elastic portion of the ring or sleeve and 4I vintegral sealing bodies or hardened portions at the opposite ends of the exible portion, one adapted to contact the sealing face on the casing and the other contact the sealing face of the shaft collar 3'1. 'I'he hardened sealing bodies 4| of the ring or sleeve can be suitably hardened integral end portions of the elastic sleeve, or bodies ofrsuitable anti-friction material vulcanized to the ends of the flexible elastic body of the ring or sleeve. l

In Figs. 1, 3, 4 and s, a'n additional seanng washer or ring 43, similar to the'ring 36 is arranged between the shaft collar 31 and they adjacent end of the bearing 36, with the opposite ends of this ring pressed againstl the collar and the end of the bearing by the compression of the elastic sleeve 35, by virtue of which the shaft I4 is mounted in proper operative position. This ring 43 provides a seal at,the end of the bearing 30 and may be of carbon or' other suitable antifriction material having lubricating qualities which will take care of the wear due to end thrust between the shaft collar and the bearing.. This supplemental ring or washer can be used or`not, as may be found necessary or desirable.

The sealing chamber 'or opening 21 in the sup port 24, which is substantially closed or sealed at its outer end when the pump is assembled by the collar 31, is large enough in diameter to a1- low the shaft collar to slip freely therethrough, and, as will be clear from Figs. 3 and 4 of the drawings. when the pump casing has been detached from the support, itv can be removed and -th'e shaft-with the sealing sleeve 35, andring 36 can be pulled out of the sealing chamber and the sealing elements'slipped ofi. of the shaft so that all of these parts are accessible for thor-v ough cleaning. The shaft can be removed together with thel casing when removing the lat:v ter or separately therefrom after the casing has been removed.

We claim as our invention: l

1. Thecombination of a casing, a rotary shaft passingl through a. shaft opening in a wall of the casing, said lwall and shaft having opposed faces ing a fixed sealing chamber around theshaft outwardly from said wall, said casing wall being removably mounted at the inner end of said sealing chamber and movable off of said shaft, sealing means for said shaft opening comprising an elastic imperforate walled sleeve surrounding the shaft in said sealing chamber between said opposed faces, and a sealing body which surrounds the shaft in said sealing chamber and is pressed axially by said sleeve `against one of said faces vby reaction of said sleeve against said other face, said sleeve and sealing body. being. loose in and removable with the shaft from said' sealing chamber through said inner. end thereof when the casing has been removed from the inner end of the sealing chamber and said sleeve and sealing body being removable from said shaft when the shaft is withdrawn from the casing.

2. 'I'he combination of a pump casing, a rotary shaft passing through a shaft opening in a wall of the casing, a fixed support external to the casing having a sealing chamber through which the shaft passes from the casing and at the inner end of which said casing wall is removably secured on said support, said shaft having a fixed collar thereon within said sealing chamber providing a face outwardly beyond and opposed to the outer face of said casing wall, sealing means for said shaft openingcomprising an elastic imperforate walled sleeve surrounding the shaft between said opposed faces, and an annular sealing body which surrounds the shaft and isv pressed by said elastic sleeve against one of said faces by reaction of the'sleeve against said other face, said sleeve and sealing body being loosely confined in said sealing chamber and removable with the shaft through said inner end of the sealing chamber when said casing wall is re moved` from said support and said sealing body and sleeve being loose on and removable from said shaft. y

3. 'I'he combination of a casing, a rotary shaft passing through a shaft opening in a wall of the casing, a fixed support external to the casing' having an axial opening through which said shaft passes from the casing and at the inner end of which said casingwall is removably secured, said shaft having a transverse annular face outwardly beyond and opposed to the outer face of said casing wall, sealing means for said shaft opening comprising an' elastic imperforate walled sleeve surrounding the shaft between said opposed faces, and an annular sealing body which surrounds the shaft and is pressed by said elastic sleeve against one of said opposed faces by reaction of the sleeve against said other face, said sleeve and sealing body being of smaller diameter `\than and removable with the shaft through said inner end of said support opening when said casing wall is removed from said support and said sealing body' and sleeve being loose on and removable from said shaft.

4. The combination of a casing, a rotary shaft passing through a shaft opening in a wall of said casing, a fixed support for said casing having an aperture in alignment with said shaft opening in said casing when said casing is mounted upon said support, said shaft having a transverse annular face outwardly `beyond and opposed to thelv outer face of said casing. wall, sealing means for said shaft opening comprising a resi'lient imperforate walled sleeve telescoped over the rotary shaft andoccupying a position intermrdiate the opposed faces v4when said shaft, said walled 'sleeve and' said casing are'mounted in operative position relative to saidA fixed support,l

and an annular sealing body which surrounds the shaft and is pressed by said resilient sleeve against said wall face by the reaction of said sleeve against said shaft face; said sleeve and sealing body being of smaller diameter than the aperture in said support and being loosely mounted on and removable from said shaft through said aperture in said support when` said casing wall is removed from said support.

5. 'I'he combination of a casing,` a rotary shaft y silient imperforate walled sleeve telescoped over the rotary shaft and occupying a position intermediate the opposed faces when said shaft/'said 'walled sleeve and said casing are mounted in operative position relative to said xed support, and an annular sealing body which`surrounds the, shaft and is pressed by said resilient sleeve against said shaft face by reaction of the4 sleeve against said wall face, said sleeve and sealing body being of smaller diameter than the aperture in said support andbeing loosely mounted on and removable from said shaft through said aperture in said support when said casing wall is removed from said support.

6. The combination of a casing, a rotary shaft passing through a shaft opening in a wall of the casing, a fixed support external vto the casingy having an axial opening through which said shaft passes from the casing and at the inner end of which said casing wall is removably secured, said shaft having a transverse annular face outwardly beyond and opposed to the outer face of said casing wall, and sealing means for said shaftv opening comprising an elastic imperforate wall having a structurally integral end formed of anti-friction material and surrounding the shaft between said opposed faces, said anti-friction end of said sleevebeingpressed by said elastic sleeve against one of said opposed `faces by reaction of the sleeve against said other-face, said sleeve with its structurally integral anti-friction end being of smaller diameter than and removable with the shaft throughvsaid inner end of said-.shaft opening when said casing wall is removed froml vsaid support and said sleeve together with its f structurally integral anti-friction end being loose on land removable from said shaft.

'7. -The combination of a casing, a'rotary shaft passing through a shaft opening in a wall of the y casing, a fixed apertured support external to the casing in which said aperture is in axial alignment with said shaft opening when said casing is mounted upon said support, means for removably mounting said oasing upon said support, a collar fixed on said shaft and having a transverse annular face outwardly beyond and opposed to the outer`face of said casing Wall, sealing means for said shaft opening-comprising an elastic imperforate walled sleeve surrounding a portion of the shaft between said opposed faces, and an annular sealing body atl each end of said sleeve surrounding the shaft and adapted to be pressed' by said elastic sleeve against said opposed faces when the casing is mounted upon said support.

8. The combination of a casing, a rotary shaft passing through a shaft opening in a wall of the casing; a xed apertured support external to the casing upon which saidV casingy may be-re movably mounted by drawing said casing toward said support in alignment with said shaft, a support for said rotary shaft, a ilxed'collar on s'aid shaft adjacent said support providing a face.

opposed to the adjacent face ofsaid casing wall, sealing means for said shaft opening comprising an elastic imperforate walled sleeve surrounding a portion of theshaft between said opposed faces, and an annular sealing body which surrounds the shaft and is pressed by said elastic sleeve against onevof said opposed faces by reaction of the sleeve against the other facesaid sleeve and sealing body being compressible against said opposed faces and said collar on said shaft being biased toward said shaft support upon the tightening of said casing upon said casing support for the operative assembly of said casing, rotary shaft, shaft opening and sealing means upon the said supports.

9. The combination of a pump casing, a rotaryshaft passing though a shaft opening in a wall of the casing, a fixed apertured support external to the casing upon which said casing is removably secured, a support for said rotary shaft, a

fixed collar on said rotary shaft adjacent said support when assembled with said casing for operation and having a face outwardly beyond and opposed to the outer adjacent face of said casing wall, sealing means for said shaft opening also comprising shaft lpositioning means-comprised of an elastic imperforate walled sleeve surrounding a portion of the shaft between said opposed faces, and an annular sealing body which surrounds the shaft and is pressed by said elastic sleeve against one of said opposed faces by ther reaction of the sleeve against said other face, said sleeve and sealing body being loosely carried on said shaft, whereby upon the assembly of said shaft in said 'support and said casing upon said casing support said elastic sleeve will be compressed, thereby exerting pressure against said collar on said shaft to bias the same toward said shaft support and thereby maintaining the same in operative position.

10. A sealing means for a rotary shaft passing through a shaft opening in al wall of a casing comprising, in combination, an elastic imperiorate walled sleeve telescoped onto said shaft, which shaft has an outer transverse face opposed to an adjacent face on said wall, .a xed support for removably supporting, said casing and having a shaft aperture axially aligned with the shaft opening in the casing wall wheny the casing is operatively supported on said support, and

kat least one sealing body telescoped onto said shaft and pressed by said sleeve against one of the opposed faces by the reaction of the sleeve against the other of the opposed faces, said sleeve and said sealing body being loose on and removable from said shaft and being of such proportion and construction and also being so arranged upon said shaft that, upon removal of said casing from said support, said sleeve and said sealing body may be' removed from said shaft through the aperture in said support.

' CHARLES B.,DALZELL.

RALPH K. MINER.

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