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Патент USA US3066709

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Dec. 4, 1962*
w. H. PEET
3,066,699
ACCUMULATOR
_ Filed Dec. 10‘, I958
2 Sheets-Sheet 2
F'IG-3
4
ATTORN YS
United States Patent O?lice
1
Z
A still further object is to provide a lip-type accumu
lator arrangement, as described in the preceding para
3,066,699
ACCUMULATOR
William Harold Feet, 1607 Firndale Place,
Ann Arbor, Mich.
graph, in which the accumulator casing is formed by two
generally similar rigid casing members, one having a
feathered lip of the sort described formed along meeting
Filed Doc. to, 1958, Ser. No. 779,3o7
11 Qlairns. (Cl. 138-30)
edge zones of the two parts; and in which the sheet-like
?exible diaphragm is marginally clamped between these
The present invention deals with an improved accumu
lator to function as an energy storing device for hydraulic
systems.
It is a general object of the invention to provide an
zones.
In accordance with another embodiment, it is an object
10 to provide an accumulator having a ?exible diaphragm
supporting element as described which is formed of ma
terial slitted and offset inwardly from the wall of the eas
ing member which de?nes the liquid pressure space or
improved accumulator which is of very simple and in
expensive construction, featuring a sheet-like ?exible dia
phragm of ?uid impermeable material serving to subdi—
'vide a pressure easing into fluid pressure spaces or cham
bers on the opposite sides of the diaphragm.
Patented Dec. 4, 1962
One of
these spaces is a liquid pressure compartment or cham
her into and out of which the hydraulic liquid of the
system is respectively received and expelled under pres
15
chamber. This element is engageable by the pressure
?exed diaphragm.
In any of these forms controlled bending of the ?exi
ble diaphragm is insured, thus preventing sharp creases
and rapid destruction due to high stress concentration,
such as would otherwise result.
sure when required. The other space is a gas compart 20
A still further object of the invention is to provide an
ment or chamber charged with a suitable gas under pres
accumulator structure in accordance with any of the
sure to act as the energy storage medium which is sepa~
above mentioned embodiments, in which the gas pressure
rated from the hydraulic liquid by the ?exible diaphragm.
space or chamber of the accumulator casing is charge
A further object is to provide an accumulator which,
able with pressure air or other gas through a normally
by reason of the improved character of its flexible dia 25 plugged charging port or opening, in the manner illus
phragm and ‘associated provisions, may be operated at
trated and described in my copending application, Serial
100% displacement of either its gas or liquid compart
No.
753,521, ?led August 6, 1958 and now abandoned,
ment, thus providing an extremely high volumetric ca
and also in a continuation of that application, Serial No.
pacity in relation to the size of the device.
143,025, ?led October 2, 1961 and now Patent No.
It is another object to provide an accumulator having
3,020,928.
a casing provided with improved means to protect the
diaphragm, in being ?exed under pneumatic and hydrau
lic pressures, against extrusion and damage. This is ac
complished by providing for a controlled ?exure of the
diaphragm.
It is another object of the invention to provide an ac
cumulator of simple character, as described, in which
means are provided, for the aforesaid purpose of dia
phragm ?exure control, in one of several different em
bodiments, but in which the purpose common to all is
to prevent extrusion of the material of the ?exed dia~
phragm. In a preferred embodiment of the invention,
the anti-extrusion control function is performed by a lip
like element internally of the accumulator casing engag
ing and sustaining the ?exed diaphragm to prevent the
material of the latter against entry into any corner or
restricted zone likely to occasion extrusion. In accord
ance with a still further preferred concept, this sustaining
element is in the form of an integral lip, or a separately
fabricated lip suitably attached, on one of two generally
similar casing members controlling a liquid ?ow port or
passage through the latter to the liquid pressure space.
Yet another object is to provide, in this preferred em
bodiment of the invention, a sealing lip as described
which is tapered or feathered toward a free terminal lip
The foregoing as well as other objects will become
more apparent as this description proceeds, especially
when considered in connection with the accompanying
drawings, illustrating preferred embodiments of the in
vention, wherein:
FIG. 1 is a fragmentary side elevational view, partially
broken away and in axial section, illustrating an accumu
lator in accordance with the preferred embodiment of the
invention, ‘different ?exed positions of the ‘diaphragm
thereof being respectively shown in dotted and dot-dash
line;
FIG. 2 is a view in transverse vertical section along line
2—-2 of FIG. 1, a ?exed position of the diaphragm as con~
trolled by a sustaining lip being indicated in dotted line;
FIG. 2A is a fragmentary view in section similar to
FIG. 2, showing an alternative form of casing construc
tion to provide a sustaining lip of the sort describe ;
FIG. 3 is a fragmentary view in longitudinal vertical
section through an accumulator in accordance With a
modi?ed embodiment of the invention;
FIG. 4 is a View in transverse vertical section on line
4—-4 of FIG. 3, ?exed positions of the diaphragm being
shown in dotted line; and
edge sustaining the ?exed diaphragm adjacent the wall
Referring first to FIGS. 1 and 2 of the drawings, the
reference numeral it} generally designates a fluid energy
of a casing member. The feathered lip edge provides no
space into which the material of the diaphragm might be
bodiment of the invention. This accumulator comprises
storage accumulator in accordance with ‘a preferred em
a casing 11 of cylindrical cross sectional outline having its
opposite ends in a semi-spherical outline. The casing is
A still further object is to provide an accumulator 60
formed of a pair of generally similar casing members 12“,
whose casing is fabricated of two similar parts of rounded
extruded with subsequent damage.
end, generical semi-cylindrical cross-section with im
proved provision to band and sealingly secure these parts
together.
13, each of generally semi-cylindrical cross‘ section, dis~
posed with their concavitie-s in mutually facing relation to
one another, and with meeting edge portions or zones 14
thereof specially formed (as will be described) ‘and in
0,065, 699
Y
s9
ransverse register. The casing members 12, 13 are pref
erably formed of steel or other rigid metal, one thereof,
i.e., the uppermost member 12 appearing in FIGS. 1 and
2, being provided with one ‘or more liquid inlets and re‘
4;
1 and 2, and may ?ex the feathered lip 29‘ outwardly
somewhat toward the Wall of casing member 12. A re
verse ?ow of liquid through ?tting 2d and port 15 may
cause this lip 29 to ?ex inwardly at least to its solid line
edge portion or zone 14. It is to be understood that this
position of FIG. 2. Liquid will thus ?ow between the
casing wall and feathered lip edge 31? and into the upper
posed, mutually facing relationship shown in FIG. 2, they
the diaphragm against creasing and/or extrusion, in the
turn ?ow ports 15 in its wall, adjacent its specially formed
liquid pressure space of chamber 34 above diaphragm 18,
edge formation 14, which serves to prevent both creasing
and will be forced to recede from that space by the pneu
of the diaphragm and its extrusion, extends substantially
matically pressurized diaphragm in a manner charac
continuously around the margin of the casing member 12.
The other casing member 13 is, as appears in FIG. 2, 10 teristic of the operation of accumulators of this type.
Should the chamber 34 become ?lled with liquid to force
of like cross sectional outline, and its specially formed
diaphragm 1d well into air pressure chamber 32, the lip
edge portion or zone is designated 16.
formation 29 of the lower casing member 13 will protect
With the casing members 12, 13 disposed in the op
?xedly clamp therebetween an enlarged bead 17 ‘formed
same manner as the member of the upper chamber.
along the peripheral marginal edge of a sheet-like flexible
diaphragm 18 of ?uid-impermeable material, the trans
verse width of which diaphragm substantially exceeds the
lip edges 39, as pressed by the diaphragm, prevent ex
diameter of the casing 11. It is to be understood that the
Thus, in reference to either the liquid pressure space
or chamber 34 or the air pressure space 32, the feathered
trusion of the material of the latter such as might damage
diaphragm margin is continuously clamped in this fashion
or weaken it.
There is no abrupt corner in this zone to
with air or other pressure gas.
material, formed in the cross sectional outline indicated
be contacted or entered into by the diaphragm. Both
about its entire periphery. The casing members 12, 13 are
feathered lip formations enable the ?uid to easily bypass
held in diaphragm clamping position by means of a metal
the same in entering or leaving the casing 11.
band 19 shaped in ‘cross section to conform with the cylin
It should also be noted that the well rounded outline of
'drical outline of the casing 11 through its periphery and its
semi-spherical end outlines. The band 19 is suitably ap 25 the edge. formations 14 and 16 permits controlled bend
ing of the diaphragm and thus prevents high stress con
plied in ?uid-tight relation to the casing members and
centration on the ?exible membrane. This feature is con
diaphragm clamped therebetween. As illustrated in FIG.
ducive to long life and resists fatigue of the diaphragm
2, it is provided with one or more radial tubular ?ttings
material.
20 for the in?ow and out?ow of liquid to and from liquid
FIG. 2A illustrates an alternative form of casing and
pressure port 15. Furthermore, the lower casing member 30
diaphragm controlling lip construction. Here, a lip for
13 is preferably provided with a device 21 for charging
mation 14’ is shown as constituted of a length of lip
the interior of the casing ‘beneath the diaphragm (FIG. 2)
The device 21 may be of
the type illustrated and described in my copending appli
cation, Serial No. 753,521, identi?ed above, comprising
a short radial ?tting sleeve 22 welded in an opening in the
band 19 in radial communication with a passageway 23 in
above as desired. It is secured, as by induction welding
35 at 14", to the inner wall of the casing, designated 11',
prior to insertion of the diaphragm 18', and the edge of
the latter is clamped between the formation 14' and the
corresponding formation 16' of the lower portion of the
casing. In this embodiment the edge of the casing 11’
to which formation 14' is secured is overlapped on its
bottom half, and the provisions for clamping the oppo
the wall of member 13, which opening is occupied by a
sealing plug 24 of rubber or the like. A retaining disk 25
is threaded into the sleeve 22 to hold plug 24 in place
against internal gas pressure in the space of chamber be
site side of the diaphragm may be similar, or may be as
neath diaphragm 1%, this disk having a central aperture
hereinafter described in connection with FIGS. 3 and 4.
through which a ?lling hypodermic needle or like instru
In other respects, the construction is the same as in FIGS.
ment may be inserted to pierce and penetrate the plug 24,
1 and 3, and corresponding reference numerals, primed,
and the disk being held in place by a removable closure
designate corresponding parts.
plug 27. Plug 27 is provided with a conical nose 26 seat
The alternative embodiment of the invention illustrated
ing in the aperture of disk 25 to prevent outward cold
in FIGS. 3 and 4 employs a casing generally designated
?ow of the material of rubber plug 24. The peripheral lo
36 which may be of one-piece construction, with a con
cation of this charging means with relation to the casing
11 is not necessarily ?xed, and may be other than as 50 tinuous crimped formation 37 therearound by which the
continuous peripheral bead 17 of the ?exible sheet-like
shown.
diaphragm 18 is clamped in a ?uid tight way. In units
The special edge portions or zones 14, 16 of t re respec
handling higher pressures elongated reinforcing bands
tive casing members 12, 13 are similarly formed to pro
37' may be welded along the top and bottom of the
vide a return bent or re-entrant lip, designated 29' in each
formation 37 to brace it relative to the casing wall. The
instance. These lips are only very slightly ?exible under
diaphragm thus subdivides casing 36 to provide a liquid
pressure exerted thereon by the diaphragm 1S, and the
pressure space 38 and an air pressure space 39 respective
lips are tapered to a feather edge portion 30. These edges
ly above and beneath diaphragm 18. The wall of the
are positioned along the closely adjacent internal wall of
casing 36 is preferably equipped with a hypodermic gas
one or the other of the casing members 12, 13, thereby
i
preventing creasing and/ or extrusion of the material of 60 ?lling device 21 of the sort shown in FIG. 2.
Along the upper central Zone of the casing 36, the lat
the diaphragm, in ?exing, as against a sharp edge or
ter is provided with a pair of longitudinally extending
against the opening 15 or passage 23.
slits
49 in transversely spaced, parallel relation to one
In the normal position of the edge zone formation 14
another, and between these slits the material of the casing
of the upper, liquid pressure chamber member 12, its lip
36, represented by an elongated strip or reed 41, is offset
edge 30 is spaced, say, 0.010 inch from the casing wall,
while the spacing of the corresponding lip edge 3t) of the
air pressure chamber member 13 may be greater. How
ever, complete closure of the passage between the edge of
the lip and the casing wall does not take place.
In use, with the space 32 in casing 11 charged with air
or other gas at a desired super-atmospheric pressure, and
with a liquid line connected to liquid in?ow and return
?tting 20, the diaphragm 18 as subjected to air pressure
from beneath will bend and assume, for example, the up
wardly ?exed contour indicated in dotted line in FIGS.
radially inwardly. The slits 40 are preferably formed by
running a V-shaped milling cutter longitudinally along
the exterior surface of the casing member, resulting in
the formation of the chamfered longitudinal edges 41’ on
the reed 41. When thus formed and offset, the reed 41
exposes a liquid in?ow and return port or opening 42 of
elongated outline, the strip 41 remaining integrally con
nected to the wall of the casing 36 at its ends, as shown
in FIG. 3.
One or more retainer or stop straps 43 are
welded to the exterior of the casing across the port or
5
3,066,699
opening 42, for the purpose of limiting upward movement
of the reed 41; and an elongated liquid manifold 44 is
marginally welded along the top of the casing, enclosing
the area or zone of the port 42. This manifold is equipped
with one or more liquid ?ow ?ttings 45 opening through
an aperture 46 in the manifold.
‘
I In use, as initially pressurized by air in chamber 39,
6
from said diaphragm in an arc and terminating in an edge
merging smoothly with the inner surface of the case to
uniformly support the diaphragm when collapsed without
sharp bends.
3. The accumulator de?ned in claim 2 wherein the
edge of said leaf is normally spaced inwardly from said
casing, and wherein said leaf is ?exible for outward
the diaphragm 18 is ?exed upwardly into engagement
?exure by said'diaphragm to a limiting position wherein
with the reed 41, urging the same upwardly as indicated
said edge thereof substantially closes the space between
in dotted line toward a position adjacent or in the opening 10 said edge and said casing, thereby precluding outward
of port 42 to the liquid pressure chamber 33. Upon a
extrusion of said diaphragm through said space.
reverse ?ow of pressure liquid communicated through
4. The accumulator de?ned in claim 2 wherein said
?tting 45 to manifold 44, the reed 41 is ?exed inwardly
casing is provided with a port located to communicate
and the chamber 38 is ?lled with liquid until the charge
said one chamber with the exterior of the casing, said
shall have reached its maximum by reason of a pressure 15 leaf extending over said port and the edge thereof nor
limiting device exterior to the accumulator (not shown).
It is seen that the invention affords an improvement
in accumulators in which, regardless of whether one or
another type of ?exible diaphragm control element is em
mally being slightly spaced inwardly from said casing to
open said port to said one chamber, said leaf being
?exible for outward ?exure by said diaphragm to a limit
ing position wherein said edge thereof substantially closes
ployed, or its equivalent, it is impossible for the valve 20 the space between said edge and said casing, thereby pre
actuating ?exible diaphragm to extrude into any sharp
cluding outward extrusion of said diaphragm through said
corner and possibly damage itself. All units are extremely
space.
simple and inexpensively manufactured and assembled,
5. An accumulator comprising a hollow casing having
characteristically by reason of their use of a simple ?at,
a ?exible diaphragm within and extending across said
sheet-like diaphragm marginally clamped in a leak-proof
casing, means for marginally clamping and sealing said
fashion between continuous peripheral formations of a
diaphragm to divide said casing into ?uid receiving cham
diaphragm casing, whether the latter is formed as shown
bers on opposite sides of said diaphragm, said means in
in FIGS. 1 and 2, or as shown in FIGS. 3 and 4. The
cluding leaves respectively extending along the margin
accumulator, in any embodiment thereof, is adapted for
of said diaphragm on opposite sides thereof, said leaves
application in any type of liquid handling line simply by 30 being connected to said casing at their adjacent ends and
the connection of its liquid port ?tting to an appropriate
extending inwardly therefrom with respect to said casing
liquid pressure line of the system.
to provide opposed portions gripping and sealing the mar
In any of the adaptations of FIGS. 1 through 4, the
gin of said diaphragm, said leaves at the inner extremities
common characteristic of the ?exible sheet-like diaphragm
of said opposed portions each curving away from the
enables the accumulator to be operated at either 100% 35 other in an arc and terminating in an edge merging
displacement of either its gas chamber or compartment
smoothly with the inner surface of said casing to uniformly
or its liquid pressure chamber, thus providing an ex
support said diaphragm when collapsed without sharp
tremely high volumetric capacity, indeed, in relation to
bends.
the cubicle occupancy of the device. In this respect, the
6. The accumulator de?ned in claim 5 wherein said
improved accumulator has a great advantage over here 40 casing is provided with ports on opposite sides of said
tofore proposed ?exible separator type, bladder or dia
diaphragm to communicate said chambers with the ex
phragm accumulator constructions, in which any attempt
terior of said casing, said leaves extending over said ports
to exceed a very limited displacement inevitably results
and the edges thereof normally being slightly spaced in
in failure of the ?exible separator.
wardly from said casing to open said ports to said cham~
What I claim as my invention is:
1. An accumulator comprising a hollow casing having
a ?exible diaphragm secured therein to provide ?uid re
ceiving chambers on opposite sides of said diaphragm,
said casing having a wall cooperating in the de?nition of
bers, each leaf being ?exible for outward ?exure by said
diaphragm to a limiting position wherein said edge there
of substantially closes the space between. said edge and
said casing, thereby precluding outward extrusion of said
diaphragm through said space.
one of said chambers provided with a port adapted to com 50
7. The accumulator de?ned in claim 5 ‘wherein the wall
municate said one chamber with the exterior of said cas
of said casimr on one side of said diaphragm has an ex
ing, and a ?exible leaf connected at one end only to the
tension overlapping the wall thereof on the opposite side
interior of said casing overlying said port and presenting
of said diaphragm, and wherein one of said leaves is in
an edge at the opposite end thereof normally spaced in~
wardly from said casing wall to open said port to said one
tegral with said overlapped wall.
chamber, the other of said chambers being adapted to
casing is formed of separate sections the margins of
8. The accumulator de?ned in claim 5 wherein said
contain a ?uid under pressure acting on said diaphragm
which approach one another and have said leaves as
to urge the same toward said one wall of said casing and
integral portions thereof, and means for securing said
into engagement with said leaf to ?ex the same outwardly
casing sections together.
toward said casing Wall to a limiting position wherein 60
9. The accumulator de?ned in claim 8 wherein said
said edge thereof is substantially ?ush with said casing
securing means comprises a band encircling said casing
Wall to substantially close the space between said edge and
externally along the margins of the sections thereof.
casing wall, thereby precluding outward extrusion of said
10. An accumulator comprising a hollow casing hav
diaphragm through said space, said leaf in said limiting
ing a ?exible diaphragm secured therein to provide ?uid
position smoothly merging at said edge with said casing 65 receiving chambers on opposite sides of said diaphragm,
wall to uniformly support said diaphragm without sharp
said casing having a wall cooperating in the de?nition of
bends.
one of said chambers provided with a port adapted to
2. An accumulator comprising a hollow casing having
communicate said one chamber with the exterior of said
a ?exible diaphragm secured therein to provide ?uid re
casing, and a ?exible leaf connected at one end to the
ceiving chambers on opposite sides of said diaphragm, 70 interior of said casing overlying said port and presenting
a leaf in one chamber connected at one end to said casing,
said leaf having a portion extending from its connected
end inwardly with respect to said casing in overlying rela
tion to the margin of said diaphragm, said leaf at the
an edge normally spaced inwardly from said casing wall
to open said port to said one chamber, the other of said
chambers being adapted to contain a ?uid under pres~
sure acting on said diaphragm to urge the same toward
inner extremity of its overlying port-ion curving away 75 said one wall of said casing and into engagement with
aeeaeeo
said leaf to ?ex the same outwardly toward said casing
wall to a limiting position wherein said edge thereof is
substantially ?ush with said casing Wall to substantially
close the space between said edge and easing Wall, there
by precluding outward extrusion of said diaphragm
through said space, said leaf in said limiting position
smoothly merging at said edge with said casing wall to
uniformly support said diaphragm without sharp bends.
11. The acclumulator de?ned in claim 10, wherein said
8
leaf is connected at both ends to said casing andsaid
edge extends between said ends along opposite sides of
said leaf‘
References ?tted in the ?le of this patent
UNITED STATES PATENTS
2,324,701
2,656,067
2,801,067
Herman _____________ __ July 20, 1943
Mitchell _____________ __ Oct. 20, 1953
Mercier _____________ __ July 30, 1957
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