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Патент USA US3100063

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Aug. 6, 1963
3,100,058
w. H. PEET
ACCUMULATOR CHARGING STRUCTURE
Filed May 9, 1960
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INVENTOR.
WILLIAM HAROLD PEET
ATTORNEYS
United States Patent 0”
3,100,®58
Patented Aug. 6, 1963
2
1
aluminum casting of special cross sectional shape is dis
3,100,058
posed inside the cylinder, being axially restrained by the
ACCUMULATOR CHARGING STRUCTURE
William Harold Feet, 2115 Devonshire Road,
Ann Arbor, Mich.
?ange 14. A generally similar opposite end header mem
her or plug 20 is disposed within the opposite end of
the cylinder, being axially restrained by an annular cap
Filed May 9, 1960, Ser. No. 27,830
15 Claims. (Cl. nil-89)
22 threaded on the cylinder and formed with a radially
inturned restraining ?ange 24.
The reference numeral 26 ‘designates an elongated
tubular diaphragm of synthetic rubber or like ?exible
‘This invention relates to charging structures and is a
continuation-in-part of my co-pending application Serial
No. 753,521 ?led August 6, 1958, and now abandoned. 10 or elastically distortable material such as neoprene, proof
against attack by hydrocarbons or other ?uid to be
One object of this invention is to provide an improved
handled by the accumulator. ‘For the purpose of clamp
charging structure for a pressure vessel, and more par
ing and restraining the ends of the diaphragm, the end
ticularly for an accumulator.
plugs 18 and 20 are each provided with an annular re—
Another object of the invention is to provide a charg
ing structure for a vessel or accumulator which includes a 15 cess 28 about their outer end periphery, which recesses
receive and clamp against the cylinder 12 and the end
resilient, unapertured, pierceable plug of self-sealing ma—
terial, the plug being adapted to be penetrated by a hypo
?anges 14 and 24 an enlarged annular bead 30 at either
end of the diaphragm, thus the interiors of the casing
dermic needle or the like for charging.
11 and diaphragm 26 me eifectively sealed ?uid tight at
A further object of the invention is to provide a charg
ing structure as described in the preceding paragraph, hav 20 their ends.
The reference numeral 3-2 designates an elongated ?uid
ing a member extending over the plug to hold it against
permeable distributor core which is disposed within the
outward distortion or displacement under pressure, the
tubular diaphragm to inwardly sustain the same, while
member having an aperture for receiving the needle dur
.
permitting radial ?ow of liquid through the core in either
ing charging, and a closure ‘for covering the aperture to
thereby prevent cold ?ow of the plug through the aper 25 direction. The core is of a liquid permeable material
to permit the radial ?ow and may be of the general con
ture.
struction described in the ‘application of which this ap
Still another objective of the invention is to provide
plication is a continuation-in-part. The transverse cross
section of the core 32 corresponds to that of the inner
ends of the header members or plugs 18 and 20 which
a charging structure as described above in which the
member for holding the plug against outward displace
ment is in the form of a disc constructed to rupture at
a predetermined pressure to release the pressure, with
means for preventing separation of the ruptured disc and
plug ‘from the casing of the pressure vessel.
More speci?cally, it is an object of the invention to
provide a disc of the above description which is formed 35
directly abut its opposite ends, and the plugs have sur
faces which are mildly curved radially and axially out
wardly from these abutting zones, to sustain the dia
phragm in its innermost position without contact with any
sharp surface.
The core is supported by the elongated parallel control
with an annular zone of weakness about the central por
tion thereof which overlies the plug so that the disc will
rupture in the annular zone, ‘and in Which the means
members ‘34 which are provided with a multiplicity of
longitudinally extending external ?utes 35 along their
length. To this end, each of the end plugs or headers is
for preventing separation of the disc comprises a cyl
inder, one end of which clamps the margin of the disc 40 provided with diametrically spaced recesses 36 in its
inner shaped end, which recesses receive the ends of the
outwardly of its annular zone of weakness and the other
?ow control members 34. The ?ow control members
end of which has an inturned ?ange for retaining the cen
34 extend through bores in the permeable core. Liquid
tral portion of the disc in the event of rupture.
passages 38 in the plug 18 diverge radially outwardly
Other objects of the invention will become apparent
as the following description proceeds, especially when con 45 to the recesses 36 from ‘a centrally threaded passage 40
adapted to receive a liquid ?tting, not shown. Accord
sidered with the accompanying drawing, wherein:
FIGURE 1 is an axial sectional view of an accumu
ingly, when the accumulator is connected to a source of
lator having charging structure constructed in accord
pressure at the passage 40, liquid under pressure may
?ow through the diverging passages and along the exter
FIGURE 2 is a vfragmentary sectional view of the 50 nal, longitudinal control member ?utes 35.
Hydraulic ?uid may thus ?ll the interior of the dia
accumulator rotated 90° from the position shown in FIG
ance with my invention.
phragm, being connected to a suit-able source at the pas
sage é-tl and being free to move radially in and out
through the core depending ‘on variations in the pressure
URE 1.
FIGURE 3 is an enlargement of the charging struc
ture shown in FIGURE 1.
FIGURE 4 is similar to FIGURE 3 but shows .a modi
?cation.
FIGURES 5 and 6 illustrate another modification.
Referring now more particularly to the ‘drawing and
especially to FIGURES 1-3, an accumulator is illus
trated which has an outer shell or casing 11.
The ac
cumulator casing is composed of a rigid elongated cyl
inder 12 which is formed at one end to provide a radi
ally inwardly extending annular retaining ?ange 14.
An end header member or plug 18 in the form of an
55 of the hydraulic ?uid.
The space within the casing surrounding the diaphragm
is charged with air under pressure by a novel charging
structure 142 best shown in FIGURE 3. As there illus
trated, the charging structure comprises a resilient, un
60
iapertured, pierceiable plug 44 of a suitable self-sealing
material such as rubber or the like which is adapted to
be penetrated by a hypodermic needle type charging ?t
ting. The plug is shaped to ?t within the counterbored
hole 47 in the wall of the casing cylinder 12. -
3
3,100,058
In order to prevent the plug from being blown out of
the opening by the interior gas pressure, an intern-ally
threaded adapter ring 50 is welded to the exterior of the
cylinder, concentrically of the opening 47, and a cen
trally apertured metal disc 52 is threaded into rthe adapter
ring. The metal disc has a central conical aperture 54
for receiving the hypodermic needle during charging.
4
ring 76. The adapter ring 76 is concentric with respect
to the oounterbored opening 78 in the casing which leads
to the space to be charged. The pierceable plug 80' of
resilient, unapertured, self-sealing material such as rub
ber or the like, is shaped to ?t within the counterbored
opening 78 and is maintained in the opening against out
ward distortion or displacement by a metal rupture disc
82. The rupture disc is slipped into the adapter ring and
is supported on an annular shoulder 8'4 about the opening.
In order to prevent the material of the plug from cold
flowing through the aperture 54 under the internal pres
sure of the accumulator, a restraining plug 56 is threaded 10
The central portion of the disc, designated 86, extends
‘into the adapter ring on top of disc 52, being removable
over and bears against the outer surface of the plug.
for recharging of the accumulator as desired. The re
The central portion of the disc is formed with an internal
straining plug has a conical tip 53 shaped to ?t closely
hollow
extension 87 which communicates with the central
within the aperture of the disc when the plug is installed
as shown, the end of the tap engaging the surface of the 15 conical charging aperture 90 in the disc, the charging
pierceable plug 44.
‘aperture having the same dimensions as described above
in connection with the ‘other modi?cations. The hollow
extension is internally threaded and a plug 92 is threaded
into the hollow extension, being formed with a conical
In order to charge the accumulator, the restraining
plug 56 is removed ‘and the hypodermic needle is forced
through the pierceable plug 44 to the interior space. The
period of time that the’ apenture is open for charging is 20 tip 91 shaped to ?t the charging aperture and to bear
‘against the surface of the pierceable plug. A typical
not of su?icient duration that the material of the pierce
charging needle is shown ‘at N.
able plug will cold flow therethrough. However, imme
A retainer cage 94 is provided for the rupture disc,
diately after charging the restraining plug should be rein
being
in the form of a cylinder 96 threaded into the
stalled; otherwise it is only a matter of time before the
pierceable plug will cold ?ow through the charging aper 25 adapter ring with one end thereof bearing against the
outer margin of the disc to clamp it in place. The annu
ture.
lar Zone separating the outer margin of the disc from
The cross section of the conical charging aperture at
its central portion is of reduced cross section as shown
its small end is important in view of the relatively high
at 98 so that the disc will fail under a predetermined
pressures employed in accumulators of this type. If the
pressure within the accumulator. This is provided as a
aperture is too large, the pierceable plug will cold flow
safety measure to prevent the accumulator as a whole
in ‘the brief time that the aperture is open for charging.
from exploding. FIGURE 6 illustrates the charging struc
Preferably the aperture at its smallest cross section should
ture after rupture of the disc.
be on the order of .010" in diameter. The aperture at
As shown, the cylindrical portion 96 of the cage is
its smallest cross section may under certain circumstances
provided with a radially inturned annular ?ange 100
be increased as high as .012" or .016" in diameter.
which is of smaller diameter than the central portion of
Nevertheless, a diameter of .010” is prefer-able under
the disc, thereby serving as a retainer and preventing the
most circumstances.
ruptured central portion of the disc and the pierceable
It will be noted that the inner surface of the plug 44
plug from separating with respect to the accumulator.
'is ?ush with the inner surface of the cylinder wall. Thus,
The opening provided by the flange 100‘ is slightly greater
no sharp edges are provided which might cause damage
in diameter than the hollow extension of the central por
' to. the ?exible diaphragm of the accumulator.
tion of the disc to clear the extension 87. The cylin
FIGURE 4 illustrates a charging structure having a
drical wall of the cage is formed with one or more vents
modi?ed construction. The charging structure there
102 to enable the gas pressure to escape from the accumu
shown is generally indicated at 60 and comprises a pierce
lator after rupture of the disc.
ahle plug 62 ‘which is formed of a resilient, unapertured,
What I claim as my invention is:
self-sealing material, such as rubber. The plug has a 45
1. In an accumulator having a casing, means for charg
small diameter portion ?tting within ‘an opening 64 in
ing the interior space of said casing comprising a resilient,
the cylinder 12 and a large diameter portion on the outer
side of the cylinder Wall ?tting within the internally
unapertured, pierceable plug of self-sealing material, said
threaded ‘adapter ring ‘65 which is welded to the exterior
of the casing, concentrically of the opening 64. The disc
66 is disposed within the adapter ring and extends over
and bears against the ‘outer end of the plug.
casing having an opening to said space receiving said plug,
said plug being adapted to be penetrated by a hypodermic
in the disc 66 has the same cross sectional dimension as
being ?ush with the inner surface of said casing.
needle or the like for such charging, a removable rigid
disc secured to said casing outwardly of and over said
plug to hold the latter against outward distortion or dis
The disc has an outward hollow extension 68 which is
placement under pressure, said disc having an aperture
in threaded engagement with the adapter ring, and
threaded in the hollow extension is a needle 70 formed 55 IlIO receive the needle for charging, and a removable closure
for said aperture having a part shaped to enter the aper
with a conical tip 72 adapted to ?t within the central
conical [charging aperture 71 in the disc. The aperture
ture and engage the plug, the inner surface of said plug
the apenture in the disc shown in the FIGURE 3 construc
2. In a pressure vessel having a casing, means for charg
tion, and the gas space is charged by removing the needle 60 ing the interior space of said casing comprising a resilient,
70 and inserting the hypodermic needle through the
unapertured, p-ierceable. plug of self-sealing material, said
pierceable plug. The pierceable plug would in time cold
casing having an opening to said space receiving said plug,
said plug being adapted to be penetrated by a hypodermic
?ow through the charging aperture 71 due to the pressure
needle or the like for such charging, a removable rigid
in the accumulator except for the tip of the needle which
?lls the aperture and engages end surface of the pierce 65 disc secured to said casing outwardly of and over said plug
to hold the latter against outward distortion or displace
able plug,
ment under pressure, said disc having an aperture (to re
A cap 73! extends yover the end of the adapter ring and
ceive the needle for charging of a diameter on the order
is threaded thereon as shown. The transverse wall of
of .010 inch, and a removable closure for said aperture
the cap ‘bears on the open end of the hollow extension of
70 having a pointed tip shaped to enter said aperture and
the disc to serve as a retainer.
engage the plug.
FIGURES 5 and 6 show another modi?cation. The
3. The structure as set forth in claim 2 in which said
charging structure there illustrated is generally indicated
casing has an annular extension about said disc and re
‘at '14. The cylinder 12 is formed with an integral radi
movable closure with which said disc and removable
ally outward hollow projection which serves as an adapter 75 closure is threadedly engaged.
3,100,058
5
6
shaped to extend into said aperture and engage the plug
to prevent cold ?ow of the material of the plug through
4. The structure as set forth in claim 2. in which said
disc has an outwardly threaded projection and said casing
has an annular extension surrounding the projection of
the aperture under the pressure existing in said space,
said disc having an annular zone of weakness about said
said disc and threadedly engaging the same, said projec
tion of said disc having a hollow interior leading to the
central portion adapted to rupture under a predetermined
aperture in said disc and threadedly engaging the remov
pressure in said space so that said plug can be blown out
of said opening to release the pressure in said space, and
able closure, and a cap threaded on the extension of said
casing and extending over the opening therein as a re
means tor preventing separation of the central portion of
said disc and plug from said casing after rupture of said
5. In a pressure vessel having a casing, means for 10 disc and release of the pressure in said space including
a retainer on said casing having an aperture to vent the
charging the interior space of said casing comprising a
tainer for said disc and closure.
released pressure, said retainer being in the form of a
resilient, unapertured, pierceable plug of self-sealing mate
cylinder removably secured within the outward projection
of said casing, one end of said cylinder hearing against
rial, said casing having an opening to said space receiving
said plug, said plug being adapted to be penetrated by
a hypodermic needle or the like for such charging, a 15 the margin of said disc outwardly of its zone of weakness
to clamp it securely to the casing and the other end of
which has an inwardly directed ?ange to be engaged by
the central portion of the disc ‘and prevent separation of
the latter against outward distortion or displacement under
said central portion and of the plug from the casing, said
pressure, said disc having an annular zone of weakness
about said central portion [adapted to rupture under a pre 20 ?ange being of a dimension to clear the hollow extension
of the disc.
determined pressure in said space so that said plug can
10. The construction as in claim 9 in which said pres
be blown out of said opening to release the pressure in said
sure vessel is an accumulator having a diaphragm therein
space, and means for preventing separation of the central
cooperating with a wall of the casing to de?ne said space,
portion of said disc and plug ?rom said casing after rup
ture of said disc and release of ‘the pressure in said space 25 said plug extending flush with the inner surface of the
casing
including a retainer on said casing having an aperture
rigid disc secured to said casing outwardly of said plug
and having a central portion overlying said plug to hold
11. The construction as in claim 10' in which the
aperture in said disc has a minimum diameter on the order
of .010”.
has an aperture to receive the needle for charging, and
12. In a pressure vessel having a casing, means for
a removable closure carried by said disc and having a 30
to vent the released pressure.
6. The construction as ‘in claim 5 in which said disc
charging the interior space of said casing comprising a
part shaped to enter the ‘aperture and ‘engage the plug.
resilient, unapertured, pierceable plug of self-sealing mate
7. In a pressure veseel having a casing, means for
rial, said casing having an opening to said space receiving
said plug, said plug being adapted to be penetrated by a
charging the interior space of said casing comprising a
resilient, unaper-tured, pierceable plug of self-sealing mate
rial, said casing having an opening to said space receiving
said plug, said plug being adapted to be penetrated by
35 hypodermic needle or the like for such charging, a mem
ber secured to said casing outwardly of and over said
plug to hold the latter against outward distortion of dis
placement under pressure, said member having an aper
ture to receive the needle for charging, and means ‘for
a hypodermic needle or the like for such charging, said
casing having an exterior outward annular projection
about said opening, a rigid disc within said projection
having a central portion overlying said plug to hold the 40 closing said aperture.
13. In an accumulator having a casing, means for
latter against outer distortion :or displacement under pres—
charging the interior space of said casing comprising a
sure, said disc having ‘an annular zone of weakness about
resilient, unapertured, pierceable plug of self-sealing mate
said central portion and within the {outer margin thereof
rial, said casing having an opening to said space receiving
adapted to rupture under a predetermined pressure in said
said plug, said plug being adapted to be penetrated by a
space so that said plug can be blown out of said open
45
hypodermic needle or the like for such charging, a mem
ber secured to said casing outwardly of and over said
plug to hold the latter against outward distortion or dis
and plug from said casing after rupture of said disc and
placement under pressure, said member having an aper
release of the pressure in said space including a retainer
secured within said outward projection having an aper 50 ture to receive the needle for charging, and a removable
closure for said aperture having a part shaped to enter
ture to vent the released pressure,
retainer being in
ing to release the pressure in said space, and means tor
preventing separation of the central portion of said disc
said aperture and engage said plug.
clamping engagement with the outer margin of said disc
to lock it securely to the casing.
14. In a pressure vessel having a casin , means for
charging the interior space of said casing, comprising a
8. The structure as set forth in claim 7 in which said
retainer is in the form of a cylinder one end of which 55 resilient, unapertured, pierceable plug of self-sealing ma
ter-ial, said casing having an opening to said space receiv
clamps over the outer margin of the disc and the other
ing said plug, said plug being adapted to be penetrated by
end of which has an inturned ?ange engageable with the
a hypodermic needle or the like for such charging, a
central portion of the disc atter rupture to prevent the
member secured to said casing outwardly of and over
separation of the central portion of the disc and plug
said plug to hold the latter against outward distortion or
from the casing.
60
displacement under pressure, said member having an aper
9. In a pressure vessel having a casing, means for
ture to receive the needle for charging of a diameter on
charging the interior space of said casing comprising a
the ‘order of .010 inch, and a removable closure for said
resilient, unapertured, pierceable plug of self-sealing mate
aperture having a part shaped to enter said aperture and
rial, said casing having an opening to said space receiving
engage the plug.
said plug, said plug being adapted to be penetrated by
65
a hypodermic needle or the like for such charging, said
15. In a pressure vessel having a casing, means for
charging the interior space of said casing comprising a
casing having an annular outward projection about said
resilient, unapertured, pierceable plug of self-sealing ma
opening, a rigid disc
said outward projection having
terial, said casing having an opening to said space receiv
a central portion overlying said plug to hold the latter
against outward distortion or displacement under pressure, 70 ing said plug, said plug being adapted to be penetrated
by a hypodermic needle or the like for such charging,
said central portion of said disc having an aperture therein
said casing having an exterior outward annular projection
to receive the needle for charging, said central portion of
about said opening, a rigid disc Within said projection
said disc having a hollow outward extension the interior
having a central portion overlying said plug to hold the
of which leads to said aperture, a valve member remov
latter against outer distortion or displacement under pres
ably secured in said hollow extension and having a tip
3,100,058
7
8
sure, said disc having an annular zone vof Weakness about
References Cited in the ?le of this patent
UNITED STATES PATENTS
said central portion and within the outer margin thereof
adapted to rupture under a predetermined pressure in said
space so that said plug can be ‘blown out of said opening
to release the pressure in said space, means for prevent
5
ing separation of the central portion of said disc and plug
from said casing after rupture of said disc and release
of the pressure in said ‘space, and means engaging the
outer margin of said disc to lock it securely to the casing.
1,584,523
2,583,231
2,620,090
2,710,623
2,830,610
Chupa ______________ __ Apr. 15, 1958
216,036
Great Britain _________ __ May 22, 1924
Egbert ______________ __ May 11, 1926
Ragland _____________ __ Jan. 22, 1952
Hill __________________ __ Dec. 2, 1952
Kolos ________________ __ .Tune 14, 1955
FQREIGN PATENTS
10
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