Патент USA US2407218код для вставки
Sept. 1-0, 1946. ‘K, A; BEER ' ‘ ' FLUID SEALING DEVIC‘E > Filed Feb. _PI ‘ , 1 2,407,218 ‘ ‘ 9,“ 1945 _ > ' - ‘I “T 2— i - Z7 ‘ " Y - J0 ' Z9 Z5 \ \\ I ‘I ‘ Z2 . 20* INVENTOR. Ku/w 6’. 35/1272. 2,407,218 Patented Sept. 10, 1946 UNITED ‘STATES PATENT OFFICE 2,407,218 FLUID SEALING DEVICE Kurt A. Beier, Indianapolis,.lnd., assignor to Schwitzer-Cummins Company, Indianapolis, Ind., a corporation Application February 9, 1945, Serial No. 577,040 1 Claim. (01. 286-11) 1 2 This invention relates to improvements in ?uid sealing devices particularly adapted for use in stantial improvement thereon. The sharp edged tongue and slot interlocking of the sealing washer, connection with water pumps, compressors, or generally formed of a carbon composition, de similar apparatus having a shaft rotatably sup ported in a bearing housing. As applied to the shaft of a water pump, it is adapted to prevent fluid leakage to and about the shaft and its bear velops a corrosive action such as to wear and eat away the tongues or lugs of the washer, per mitting of too much play and chatter and eventually destroying them. To overcome this lngs. condition the usual radially extending lugs of the sealing washer are eliminated and the interlock This is of the general character of the fluid seal disclosed in my Letters Patent No. 2.250348 10 ing to prevent relative rotation is accomplished by forming about the periphery of the sealing " granted July 22, 1941, and involves the use of an washer one or more inwardly extending arcuate inwardly flanged ?exible sealing sleeve for per recesses into which inwardly depressed arcuate mitting longitudinal movement of the associated interlocking lugs conforming thereto are pro sealing members as well as the rotating shaft and vided about the adjacent portion of the retaining associated parts, and maintaining them free of cup. contact with the fluid, the seal beingnormally out Another feature of the invention resides in pro of contact with the shaft. 1 viding the retaining cup with an annular center It is the object of this invention to provide a ing shoulder to receive and position the ?exible complete seal of unit construction or capsule form to include the sealing washer, while permit sealingv sleeve therein and retain it centered and ting of longitudinal ?exibility to take up and compensate for wear or misalignment. Whereas the seal of the above patent includes a self-com spaced from. the shaft over which the seal is mounted. This centering shoulder on the cup prevents the sealing sleeve from becoming dis placed or slipping down into contact with the shaft. tained unit embodying the ?exible sleeve, spring and retainers. the sealing washer was separate therefrom and required assembly therewith. This invention contemplates the employment of the complete sealing device in a capsule or unit con struction including the sealing washer all as sembled, centered and contained by a seal retain ing cup for convenient installation in any con struction which may be either a stationary hous The full nature of the invention will be under— stood from the accompanying drawing and the following description and claim: I Fig. 1‘ is a central vertical section through a 30 housing, rotor and sealing device therefor with the rotor shaft in elevation. Fig. 2 is a front elevation of a sealing device ing or a rotor. viewed from the sealing washer side thereof. This construction and arrangement of the parts in a retaining cup to provide a complete unit, not viewed from the rear or cup side thereof. only makes possible a greatly simpli?ed method of machining the stationary housing or the rotor for insertion of the complete unit, but also over comes the di?iculty of assembling the parts of the seal to properly center them relative to each other and the shaft about which they are mounted. Thus expensive turning and milling operations in a stationary housing or a rotary member are eliminated and any contact between Fig. 3 is a rear elevation of the sealing device In the drawing there is shown a seal embody ing this invention mounted, for purposes of i11us-_ tration, in a water pump housing I0 to surround and'sea-l a shaft I I for driving an impeller or rotor l2. The shaft extends from an enlarged bearing portion l3 rotatably mounted in the bearing portion Id of the housing in whichga drain port‘ [5 is provided to drain away any leak age thrown from the flinger disc l6 mounted on the elements of the seal and the rotating shaft is 45 the shaft adjacent the bearing portion and ro prevented. tating therewith. The housing It is provided with a cylindrical Another feature of the invention resides in the interlocking and driving relation between the seat I‘! formed with a shoulder l8 for receiving the sealing device. The sealing device is slipped parts, whereby relative rotation between the or press ?tted into the seat I‘! in fixed and seal ?exible sealing sleeve and the sealing washer is prevented. Whereas it has been the practice to ing relation with respect to the housing. Where provide the sealing washer with radially extended in the seal is herein shown as mounted in the stationary housing of a structure such as a water square lugs slidably mounted in square keyways pump, compressor or the like, the arrangement provided in the housing or rotor in which the seal is mounted, this invention involves a sub 55 may be reversed wherein the seal is similarly 2,407,218 3 4 ?tted into a seat formed in the rotor or hub portion of an impeller or the like. The sealing device of the invention comprises an annular retaining sealing cup 20, having an conforming inwardly curved arcuate interlocking lugs 30. Said lugs 30 are formed to extend only partially inwardly from the front open faced edge of the cup to an extent slightly greater than the open face and a partially closed face. The open 5 thickness of the washer. Thus the lugs 30 inter face referred to as the front of the seal is adapted lock with their respective recesses 29 to prevent to receive the ?exible sealing sleeve or rubber seal relative movement between the washer and the member 2| and the sealing washer 22. The seal ing sleeve is U-shaped in cross section, having retaining cup. By reason of the arcuate contour of the interlocking lugs and recesses, a substan inwardly extending ?ange portions, one bearing 10 tial bearing surface is provided and sharp cutting in sealing relation against the inner wall of the retaining cup back portion and the 'opposed ?ange having sealing engagement with the seal ing washer 22. The intermediate outer portion edges avoided. Also the cutting or abrasive ac tion of the sealing washer is minimized or elim inated by reason of the lugs being formed on the of the sealing sleeve between the two opposed 15 ?anges extends outwardly for ?exing to permit its ?anged portions to move toward and from each other, such as to compensate for wear or cup rather than on the washer as heretofore. From the above it will be observed that a com plete self-contained capsule-like seal is provided, such as may be readily installed or removed for replacement, with all parts in proper assembled misalignment of the relative rotating parts in and centered relation including the sealing wash which it is installed. 20 er or carbon disc; and wherein the carbon disc Embraced within the ?exible sealing sleeve be is restrained against relative movement with re~ tween its opposed ?anges there are a pair of speot to the ?exible seal by a tongue and slot spring retainers 23 and 24. A pressure member arrangement wherein the interlocking tongue or or coil spring 25 is mounted within the sleeve lug is of arcuate form on the retaining cup rather between the retainers for exerting axial pres 25 than protruding outwardly from the sealing sure upon the ?anges of the sleeve to yieldingly washer. maintain them in sealing engagement with the The invention claimed is: retaining cup and sealing washer respectively. In a ?uid seal, a self-contained unit compris The back wall of the retaining cup is dished ing a ?exible rubber sleeve of an annular forma to provide an annular centering shoulder 26 con forming in diameter to the adjacent inwardly extending ?ange of the sleeve. This dished por 30 tion adapted to surround a shaft in spaced rela tion thereto and having an intermediate bulged portion to permit axial expansion and contrac tion, spaced resilient integral ?anges on said tion of the cup is formed to receive and conform to the sealing sleeve so that said sleeve will be sleeve to form spaced end walls therefor, an ex restrained within the con?nes of the centering panding spring within said sleeve and acting be shoulder to retain it in proper centering and tween said ?anges for ?exing said ?anges about spaced relation with respect to the shaft II. their connections with said sleeve, a rigid sealing The sealing washer 22 is bevelled about its Washer formed with a plurality of arcuate re outer edge as indicated at 2?, and the edge of cesses in the periphery thereof, a seal retaining the retaining cup about its open face is formed 40 cup embracing said sleeve and washer, a plural with a pair of spaced inwardly struck retaining ity of inwardly bent tongues formed about said tongues 28 overlapping said bevelled edge of the cup inwardly of the periphery of said washer for washer. Thus as the seal assembly and Washer retaining it with said sleeve in unitary sealing are mounted within the cup, the tongues 28 are relation against the tension of said spring, in struck inwardly to retain the entire seal assem wardly extending arcuate lugs formed from the bly within the cup as a unit. periphery of said cup conforming to and seat— To prevent relative rotation between the cup able in said arcuate recesses respectively for in and sealing washer, and through the cup, be terlocking engagement therewith to prevent rela tween the sealing sleeve and washer, said washer tive rotation therebetween, and an annular cen is formed with one or more inwardly and arcu- tering shoulder formed in the opposite end por ately formed recesses or pockets 29, there being tion of said retaining cup to provide an annular illustrated herein three of such recesses equally seating and centering shoulder for said sleeve. spaced about the periphery of the washer. The retaining cup is formed with similarly positioned KURT A. BEIER.