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Патент USA US2407218

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Sept. 1-0, 1946.
‘K, A; BEER
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FLUID SEALING DEVIC‘E
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Filed Feb.
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2,407,218
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9,“ 1945
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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.
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