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‘ Aug. 19, 1947.
F, EQPAYNE
-
- 2,426,047
FLUID sE'AL um'r
Filed-Sept. 14,.1944
26
13 17
25*‘?
a
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2,426,047
Patented Aug. 19, 1947
UNITED STATES PATENT OFFICE '.
‘FLUID SEAL UNIT
Frank E. Payne, Glencoe, 111., assignor
to Crane
a corporation
Packing Company, Chicago, Ill.,
of Illinois
Application September 14, 1944, Serial No. 554,039
7 Claims. (Cl. 286-311)
Fig. 3 illustrates a modi?cation of the sup
porting means at one end of the unit.
,
_
This invention relates in general to a ?uid seal
In ?uid sealing units applied to shafts of pumps,
ing device for rotating shafts of pumps, com
compressors, and the like, it is usually desirable to
pressors, and the like, having a portion which
?ts tightly upon the shaft and another portion CH make a tight ?tting joint with the shaft at one
end and to provide for a frictional or slip connec
which has a slidable sealing surface for engaging
tion with a surface at right angles to the shaft at
the other end of the seal. The seal is rotated
with the shaft and makes a ?uid-tight connection
a stationary contact surface at right angles to the
shaft.
An important object of the invention is to pro
vide a self-contained sealing unit adapted to be 10 with a frictional surface at right angles to the
shaft. With these conditions, it is necessary to
applied to any part which it is intended to ?t.
transmit the driving pressure from one end of
A further object of the invention is to com
bine a ?exible bellows seal in a unitary structure
adapted to be preloaded on a shaft and having a
the
seal to the other. If the seal is composed of ‘ v
resilient ?exible material such as rubber or a
rubber substitute, the driving of one end by the
frictional member to make a ?uid-tight sealing 15
other tends to distort the intermediate portion of
’
the seal and to cause undue wear and leakage.
A further object of the invention
is to provide a
The present invention overcomes these objections
?uid seal of the class described having a resilient
and also provides
'
in which the
driving member engaging a shaft at one end
sealing
member
is
retained
in
place
at both ends
and a contact member at the other end free from 20
by a covering sleeve which prevents transverse
shaft with a connecting‘
engagement with the
distortion of the member between the ends there
shell enclosing the parts and forming a driver
of, and also provides suitable support and pres
from the contact end to the frictional contact
the sealing member to insure a
joint.
member at the other end without distorting the
resilient
A stillmember.
further object of the invention is to
25
proper sea-ling engagement at both ends thereof.
Referring now more particularly ,to the draw
ing,
this seal is shown and described as applied
provide a sealing unit of the class described hav
to a rotatable shaft 5 having a stationary bearing
ing an outer shell which encloses a frictional con
or support 5 at one end and usually having an
tact member, a bellows seal and expanding means
impeller, a collar, or some other member 1 secured
30
therefor and also assists in applying the sealing
to and rotatable with the shaft at a distance from
member to'a shaft which it is intended to ?t.
the bearing 6 to provide a space between them
A further object of the invention is to provide
into which the seal is inserted.
‘
>
a bellows seal composed of resilient rubber-like
This seal' comprises a ?exible resilient member
material having a portion to fit tightly against
8 of rubber or rubber-like material which may
the shaft at one end and supported at the other
be cast or molded as desired. At one end of the
end to insure its freedom from contact with the
sealing member is a short sleeve portion 9 adapted
to be preloaded upon. the shaft 5 or any shaft
shaft.
A further object of the invention is to provide a
which it is intended to fit. At the outer side of
?uid seal having a resilient sealing member and
the sleeve portion is a groove l0 providing an
an enclosing unitary shell having resilient means 40 abutment or shoulder‘ H at the outer end, and
for insuring sealing contact of the outer ends of
the sealing member within the shell.
extending outwardly from the opposite end of
the sleeve is a sealing ?ange l2. Another seal
Still a further object of the invention is to pro
ing flange 13 is connected to the sleeve portion
vide a unitary sealing device of this kind which 45 by an integral resilient bellows ll. The outer
is effective and e?icient in operation and may be
extremities of the sealing ?anges l2 and 1' l3
project outwardly beyond the outermost folds
assembled, applied and sold inexpensively as a
one piece unitary structure.
Other objects of the invention will appear in the
of the bellows l4 providing a space for the inser
tion of an expansible coil spring l5 between the
speci?cation andwill be‘ apparent from the ac
50 outer portions of the inner faces of the ?anges _
companying drawing in which
.
Fig-1 is a view partly in section illustrating a
unitary seal, in accordance with this invention,
without interfering with the ?exing movement
of the bellows folds.
of the spring
In order to equalize the pressure rings l6 and
l5
upon
the
?anges,
metal
contact
as applied to a pump or compressor shaft;
Fig. 2 is an end view of the sealing unit as 55 I‘! are inserted at the ends of the springs in con
taken on the line 2-2 of Fig. 1; and
2,428,047
tact with the‘?anges l2 and i3 and extending
inwardly as far as the bellows fold will permit.
The spring l5 therefore assists the natural re
silience of the bellows l4 in pressing the ?anges
at one end and a preloaded sealing member at
the other end connected by a driving sleeve which
insures contact with the sealing member with the
l2 and I3 oppositely. In the outer face of either .
‘or both ?anges are circular grooves IE to assist
in making a more fluid-tight joint with any sur
face which is engaged thereby;
In contact with the outer ?ange i3 is a fric
tional disc 20 having an internal diameter 20' 10
larger than the shaft to which ‘it, is applied so that
it will move freely thereon and having a projec
tion 2| at the outer side with a contact surface
I claim:
1. In a ?uid
ing
22 engaging the contact surface 23 of the bear
ing 6 to make a ?uid-tight or lapped joint be
tween them. At the inner side and .surrounding
the center opening is a projection 24 forming a
shoulder upon which the outer ?ange 13 is sup
ported at its inner edge and to hold this end of
the sealing member free from any contact or en
gagement with the shaft.
20
I
In the outer edge of the disc are a, number of
transverse slots 25 for engaging corresponding
inner projections or indentations 26 at the edge
25
between the
to slide axially relative to the sleeve while being
30
driven circumferentially thereby.
2. In a'?uid seal, a ?exible resilient member
adapted to ?t tightly upon a shaft at one end and
sleeve forms a cover and an enclosure for all of
the other parts of the seal and the free or open
-
frictional member for permitting relative‘ longi
tudinal movement but preventing relative rota
tive movement between them.
edge has an inwardly turned ?ange or projection
30 at intervals
which are turned inwardly after
having a connected extremity joined thereto by
' an intermediate yielding bellows fold with a ?ange
' the parts are assembled therein to hold the parts
together in a unitary structure to limit the out
ward movement of the frictional disc between
the shell and thus to limit the expansive move
ment of the inside sealing unit.
40
_
In forming a unit of this kind, the parts are
assembled in position and the ?ange or the pro
fold and tending to press the extremity of the
jections 30 are turned over inwardly, thus hold 45 sealing member tightly against the frictional
ing the parts together in a single enclosed unit.
member and upon the shoulder thereof, and a
cover shell engaging the
When the seal is applied to a shaft, the sleeve
portion 9 is pressed forcibly thereon making a
preloaded or tight connection which is main
tained by the shoulder 28 of the sleeve retaining
the unit in position on the shaft whether it en
gages a member 1 ?xed to the shaft or not. The
unit is applied so that the frictional disc 20 will ‘
be free from engagement with the end projec
tions 30 but will be held by the slots 25 and pro
jections 26 against movement relative to the
50 and extending loosely over the other portion of
the sealing member, the coil spring and the fric
tional member, inwardly turned projections at the
free end of the sleeve for limiting the outward
movement of the frictional member, inward pro
‘
_
free end of the sleeve, and
transverse slots in the edge of the frictional mem~
sleeve 21 and the disc ‘and the ?ange end l3 of
‘the sealing member will be held in partially com
rotative drive connection between the sleeve and
the frictional member.
pressed and ?oating condition within the sleeve
ready to take up any longitudinal variation or 60
3. In a ?uid sealing unit of the class described,
a rubber-like sealing member of a size to ?t tightly
movement of the shaft with respect to the ?xed
her for engaging the projections to provide a non
bearing member 6.
Instead of the frictional disc having an integral
shoulder 24, this may be omitted as shown in Fig.
3 and a supporting ring 3| angular in cross sec 65 lel to the ?ange joined thereto by a ?exible
bellows portion, spring means interposed between
tion, may ave one portion thereof seated in a
the ?ange and the extremity, a frictional disc
the inside of an end ?ange 33 (cor
responding to the end ?ange l3) so that its bel
lows portion 34 will be supported at this outer
or free end against contact with the shaft and 70
shaft, and a driving cover engaging the tight
the ?ange extremity 33 will be held against the
?tting sleeve portion and the ?ange at one end
inner face of the friction disc by a spring l5 and
a contact disc I‘! as shown in Fig. 1.
and extending loosely over the spring means, the
said extremity and the frictional member at the
With these constructions, the seal is applied
other end.
as a self-contained unit having a frictional disc
4. In a ?uid sealing device for pump shafts, and
2,426,047
;he like, a sealing member of resilient rubber-like
material comprising a sleeve ‘portion at one end
adapted to make a tight ?tting engagement with
the shaft to which it is applied and having an
integral bellows portion and an outwardly extend
ing ?ange at one end of the sleeve portion, the
bellows portion terminating in an integral con
tact extremity for engaging a surface at right
angles to the surface of a shaft to which it is
'6. A ?uid sealing unit for effecting a seal
between two relatively rotatable structures, said
unit comprising a ?exible compressible sealing
member having one end in contact with one
structure, a sealing ?ange at the other end,‘ ‘and
an intermediate yielding portion connecting the
- structure-contacting end to the ?ange, said seal
r ing ?ange and intermediate portion being freely
movable axially of the said one structure, a disc
contacting the ?ange, a unitary sleeve having one
applied, the inner face of the extremity being 10 end bridging the disc and ?ange and having a
substantially parallel to the inner face of the said
substantially cylindrical portion adjacent the
?ange, and both the outer edge of the extremity
other end compressing the structure-contacting
and the outer edge of the ?ange extending beyond
end of the sealing member against the said one
the outer periphery of the bellows portion so that
structure to e?ect a rotary-driving ?uid-sealing
15 connection therebetween, and a radial portion
spring means may be interposed between them.
5. A ?uid seal of the class described for effect
joining the said cylindrical portion to the re
ing a seal between two relatively rotatable struc
mainder of the sleeve; an axially sliding circum
tures comprising a ?exible compressible member
ferentially driving connection between the sleeve
having a portion at one end adapted to be pre
and disc, and resilient means within the sleeve
loaded upon one of said structures and having an 20 and compressed between the radial portion of the p
outer groove and an outwardly extending ?ange
sleeve and the ?ange on the sealing member for
at a distance from the end of this portion, a
holding the ?ange against the disc.
remote integral extremity connected to said one
end by yieldable folds, said extremity and folds
7. A ?uid sealing unit as described in claim 6,_
said sleeve comprising astamping which is sup
25 ported on said one structure solely by the ?exible
posed between the said extremity and the ?ange,
compressible sealing member.
I
' FRANK E. PAYNE.
contact plates interposed between each end of the
spring and the‘ corresponding extremity and
REFERENCES CITED
?ange of the sealing member, a frictional contact
member engaged by the said extremity of the 30 The following-references are of record in the
sealing member, and a driving cover sleeve hav
?le of this patent:
' ing a portion seated in the groove of the sealing
member and extending upwardly in contact with
UNITED STATES PATENTS
being free of said one structure, a coil spring dis
the outer face of the ?ange and then extending
Number '
closely over the spring and in axial sliding, rota 35 2,249,930
tive driving engagement with the outer periphery
of the frictional sealing member, the extremity of
the sleeve being turned over inwardly to engage
and limit the outward movement of the frictional
sealing member.
-
2,360,372
2,027,505
40
Name
Date
Bailey et a1. _______ __ July 22. 1941
Snyder ___________ __ Opt. 1'1, 1944
2,337,639
Winkler __________ .. Jan. 14, 1936
Brummer _________ __ Dec. 28, 1943
2,365,351
Matter ___________ -_ Dec. 19, 1944 '
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