CA1198032A - Pressure resistant accumulator device and method of making same - Google Patents
Pressure resistant accumulator device and method of making sameInfo
- Publication number
- CA1198032A CA1198032A CA000434251A CA434251A CA1198032A CA 1198032 A CA1198032 A CA 1198032A CA 000434251 A CA000434251 A CA 000434251A CA 434251 A CA434251 A CA 434251A CA 1198032 A CA1198032 A CA 1198032A
- Authority
- CA
- Canada
- Prior art keywords
- cap member
- vessel
- skirt
- weld
- cap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
A B S T R A C T
The present invention is directed to an accumulator device and method of making the same. The pressure vessel in accordance with the invention includes a shell portion having an open mouth and a cap member affixed over the open mouth after a bladder assembly has been secured within the shell portion of the pressure vessel.
A characterizing feature of the invention resides in the provision of an exterior annular weld connecting the cap member to the outer wall portion of the vessel as well as an interior weld connection between the interior wall portion of the cap member and the upwardly directed end edge of the mouth of the pressure vessel. A further characterizing feature of the invention resides in the utilization of a metallic skirt member which functions to support the bladder and to define with the inner wall surface of the cap member an annular trough containing the weld which secures the cap member interior to the uppermost edge of the pressure vessel, whereby the possibility of weld fragments falling into the bladder causing damage the latter is minimized.
The invention is further directed to a novel method of manufacturing an accumulator device of the type described wherein the interior weld between the cap member and pressure vessel end race is effected by welding mechanism inserted through the opening in the cap member which will ultimately be used to support the gas charging valve assembly.
The present invention is directed to an accumulator device and method of making the same. The pressure vessel in accordance with the invention includes a shell portion having an open mouth and a cap member affixed over the open mouth after a bladder assembly has been secured within the shell portion of the pressure vessel.
A characterizing feature of the invention resides in the provision of an exterior annular weld connecting the cap member to the outer wall portion of the vessel as well as an interior weld connection between the interior wall portion of the cap member and the upwardly directed end edge of the mouth of the pressure vessel. A further characterizing feature of the invention resides in the utilization of a metallic skirt member which functions to support the bladder and to define with the inner wall surface of the cap member an annular trough containing the weld which secures the cap member interior to the uppermost edge of the pressure vessel, whereby the possibility of weld fragments falling into the bladder causing damage the latter is minimized.
The invention is further directed to a novel method of manufacturing an accumulator device of the type described wherein the interior weld between the cap member and pressure vessel end race is effected by welding mechanism inserted through the opening in the cap member which will ultimately be used to support the gas charging valve assembly.
Description
6 ~ 3- G 13 IITl.E: P~S"U~E RESIST~I~TT ~CCUI~L~TOR DEVICE
AI~D METHOD OF l~ .ING Sr~
EACKGROU~D O.' T~E INVENTIO~
EIEI~ OF T~-IE II~TION
The present invention is in the field of aceumul.ltor aevi.ces and rel~tes more partieularly to an aceurnulato deviee ~Jhich comprises a pressure vessel having an oil port at its lower end, a cap rr.ember at lts upper end, a gas eharging valve assembly mounted in the eap rnember and an inlerior bladder assembly~ IJhieh divides the vessel into t.~lo chambe~s in communication respeetlvely with the oil port and thP ~as eharJing valve asseinbly.
THE PRIOR ART
With the proGressively increasing use of hydraulic accumulator devices for energy storage and for pulsation dampening as ~ell as other uses,inereasing emphasis has been plaeed upon eonstructing such aeeurlulators in a manner i.n wh~ieh they may be eeonomieally manufaetured and yet provide a high de~ree of resistance to the precsures ZO to whieh they are sub~'ected in use. l~no~n aceumulators ean be n~anufactured by a proeedure ~hieh i.nvolves forming threat3ed eonnectlorls on the press~ire -~essel and on the cap rr.er~ber u-~ed to clo e one end tl-lereof Such de~.ices a'ter ~sse~:ic~ and ~ith the intraciueti)n bet:Jeen the assembled parts o~ ~ppr:,priate O-rin~s or like gaC~eting ~, are capable Or ~iths-tanding nigh pressures without danger oI axial separati^n of the cap from the pressure vessel.
~owever, it ~ill be readily rec~gnizea that the aperPti3n of f3rming the pressure vecsel and the cap as by 2 forging operation and subsequently r.~achi.ni.ng the nece~sar~J threaded connections ~n the n~ted components is an extrerrely costly one li.miting the r~nge of uses with whlch the accurnulat~r rslay be ec~nornically ernployed.
Numerous me3nC have been suggested for effecti~ely uniting the cap member over the open end of the pressure vessel to effect a pressure resistant connection between such parts. Such means have included rolli.ng steps wherein the metal of the components are deformed into an inter-locking enga~ement. By way of example, of a means of connecting such components by rolling or spinning,reference is made to U.S. Patent 4~2~0,533. As will be readily understood by tho6e skilled in the metal forming art h~-~ever~ rolling or spinning to define sharp bends or interc~nnections is limite~ to metals ~f relatively small thicknes~ and thus accumulators form~d in such manner are n3t suited to high pressure operation. hdditionall.y~ the roll forming of metals about shqr~ bend lines o~ten effects cry~taliz~ti.on of the r.~_tals in the derormed areaC .ith re~ultant lea~en nC
o~ the metallic structures.
~ furt!ler me~l!od in c~r.~mon uce Jor connecti.ll~ the cap carnponents ~r an accurr!ula ,r t~ the pressure -~e~sel -?-3~componen-t involves an assernbling of the noted parts and the formatian of a weld between the outer wall portion of the vessel and the down~Jardly directed surface of the cap. However, in high pressure operations, the weld connection particularly at its interface with the ou-ter wall porti~ns of the pressure vessel has been known to shear or separate with resultant leakage, and under extreme conditions, the cap may be blown clear of its connection to the pressure vessel.
SUM~RY OF THE INVENqION
The present invention r~ay be summarized as directed to an improved accumulator device and method of making same characterized in that the components of the accumulator na~ely, the pressure vessel, the bladder assembly and the cap member are interconnected by a series of three annular welds. Importantly, to the resistance of the assembly to radial and axial f~rces resulting from the high pressure, two of such welds are effected bet~een the cap member and pressure vessel, one being the essentially conventional exterisr weld and another being a continuous annular interior ~Jeld between the upper edge of the vessel and interior ~ide wall portion of the cap. Such construction pr~v-ldes a far higher degree of iadial and axial precsure re~istance l;han the conventi~nal single exterior weld construct ion.
An important aspect of the invention re~ides in the 3~
provi.sion of a mounting skirt weldingly c^nnected to the interior of the pressure vessel and utilized as the support for the bladder assembly. Such mounting skirts are known per se. Ho~ever, in accordance with the instant invention the uppermost end of the skirt is caused to extend a distance above the open mouth po.rtlon of the pressure vessel, whereby there is de~ined bet.ween the i.nterior surface of the cap and the up~ardly extending end portion of the skirt of the bladder assembly, an annular trough for the formation of the interior weld. The provision of such trough acts to prevent the flow of ~Jeld material into the interior of the bladder with resultant damage or destruction of the bladder.
The invention is further directed to a novel method of manufacturing a high pressure resistant vessel in accordance with which method access to the t~eld area formed interiorly of the devi.ce is effected through the aperture i.n the cap which will support the gas charging valve assembly~
In accordance with a further aspect of the method the cap member may be applied in an initially.cylindrical configuration of ~Jall thickness preferably substantially close to tile wall thi.c~ness of the pressure vessel and thereafter s~un or formed into the part nemispherical configuration typically employed in accumulator device , It i.s to be not.ed that the f~rmation by spinning or rolling doe~ not require the production of any sharp berlds whereby such operation is suitable for use l/~ith thick ~/alled --4-- .
13~
materials and does n~t result in metal crystalization pr~blems .
It is accord ingly sn ob ject of the invention to provide a n vel h-.~h pressure resistant accurnulator device A further objiect of the invention is the provision oI an accumu]at~r device of the type described ~;rherein a cap member, t.hich will carry the gas chargin~ valve assembly, is secured to the pressure vessel by two annular ~Jeld connections thus greatly increas ing the resistance to separation ~f the cap from the vessel and hence increasing the pressure capability thereof.
Still a further 3bject of the inven-tion i,5 the provis ion of a method of manufacturing a high pressure resistant hydraulic accumulator device ~rhich includes the step of effecting an interior weld bet.~een the cap member and the upper end of the pressure vessel, such interior ~eld being effec ted through an opening in the cap member which ultimately carries the gas charging valve assembly Still a further ohject of the invention is the provision of a method of rnaking an accumulator ~3evice as descr-, bed ~hi.ch includes the step ;~ f for ning the cap nernber to i~s end c~nfi~,uration after the cap has been eldin~ly connected by bo-th an ini.erior arl~3 e~teri~r ~eld to the body of the prescure vessel.
Thus, in accordance with one aspect of the present invention there is provided an accumulator device comprising a pressure vessel including a closed end having an oil port and an open end, said open end terminating in an upwardly directed edye portion, a bladder subassembly mounted in said open end~ said sub-assembly including an axially elongated metallic mounting skirt having a bladder fixedl~ secured to one end thereof, said mounting skirt being disposed within said vessel with said one end nearest said closed end of said vessel, at least a portion of the outer wall portion of said skirt intimately engaging the inner wall portion of said vessel adjacent said open end, said skirt including an upper end portion e~tending above said open end of said vessel, a cap member having an opening ~or the reception of a gas charging valve, said cap member being positioned in closing relation of said open end, said cap member including a depending skirt outwardly lapping said open end, said cap member including a downwardly directed edge portion, said upper end portion of said skirt, edge portion of said vessel, ~0 and inner wall portion of said cap member to~ether defining an annular trough, a first continuous annular weld connection formed between said mounting skirt and said vessel at engaging portions thereof, a second continuous annular weld connectio~ received within said annular trough and connecting said edge portion and the inner wall portion of said cap member and a third continuous annular weld connection formed between said edge portion of said cap member and outer wal~ portion of said vessel.
In accordance with a further aspect of the present invention there is provided a method of fabricating a ~ - 5a -pressure reslstant accumulator device which includes a pressure vessel having a closed end including an oil port, and an open end having an upwardly directed edge, a bladder assembly including a metallic mounting skirt, and a cap member having an opening for the reception of a gas charginy assembly, said cap member including a depending skirt terminating in a downwardly directed edge, which comprises the steps of so inserting said mounting skirt into said vessel that an upper end portion of said skirt ex-tends above said open end of said vessel, forming a first continuous annular weld connection between said moun-ting skirt and said vessel, causing said skirt of said cap member to be mounted over said open end of said vessel with said upper end portion of said skirt, edge portion of said vessel, and inner wall portion of said cap member together defining an annular trough forming a second continuous annular connection within said annular trough and connecting said edge portion and the inner wall portion of said cap member, and forming a third continuous annular weld connection between said edge portion of said cap and outer wall portion of said vessel.
- 5b -" `:~' ' 3~
~., In order to attain these ob~ects and such other objects as may be hereinafter pointed out reference is made to the accompznying drawings in which:
Fig. 1 is a vertical section21 view thraugh ~
pressure vessel in accord2nce with the invention in a partly finished c~ndition.
Fig. 2 is a magnified fragmentary section of the pressure vessel of Fig. 1 in finished condition.
Fig. 3 is a fragmentary vertical section sirl~ilar to the section of Fig, 2 of a further e~nbodiment of the invention.
Referring now to the drawings there is shown in Fig. 1 a partially finished a~cumulator device which includes a pressure vessel 10 having an oil port 11 at its lower end, an internally threaded nipple 12 being provided to enable the vessel to be connected to the hydraulic line of a system incorporating the accumulat~r.
The pressure vessel 10 includes an open mouth portion defined by the upwardly directed end face or upper edge 13 of the pressure vessel. Preferably~ the eAterior ~rall portion 14 ~f the pressure vessel includes an cnnular groove or recess 15 adj~cent the upper end of tne vessel fnr purp~ses which l'rill appear hereina~'ter, The device includes a bladder assembly 16, s~id assembly including a retainer Member or skirt of metallic ~6_ 3~
~aterial 17 on which is supported a elastomeric bladder member 18. The bladder member 18 may include at its lower end lg~ a ri~ld button 20 kno~rn per se, which button functions in the distended condition of the bladder to seat against the oil port 11 and seal the same. The skirt 17 may include in~ardly directed flange 21 on ~Jhich is mounted b~ a carlbine~ b~nding and adhesion proQess, a thickened rim porti~n 22 of the bladder.
The accumulator device includes a cap member or sub-assembly 23 ~hich will ultimately carry the gas charging valve assembly 24 (see Fi~. 2).
There will now be described the sequence of steps employed to convert or asse~nble the elements hereinabove described to the finished accumulator assembly illustrated in ~ig. 2. As an initial step, the bladder assembly 16 is inserted through the open mouth or end 13 of the pressure vessel in such manner that the uppermost edge 25 of the skirt 17 extends a short distance "d" above the level of the upper edge 13 of the pressure vessel. With the skirt 17 thus positioned relative t~ the pressure vesse~ an annular resistance ~eld Ir-l is .or~ed bet:~een the skirt 17 and the vessel in the area in registry ~ith the groove 15 ~ ~ne p,essure vessel. The purpose of providing the groove or recess 15 i~ to le~ve a rel2tively thin ~etal ~all sect~on 15' in the pressure vessel.
3~2 Preferably the thickness of the wall porti~n 15' ~f the pres~ure vessel aligned with the groove 1~ is substantially identical of the wall thickness of the skirt 17 t~ facilitate the formation of a resistance weld.
After the bladder assembly 15 has been connected to t.he vessel 10, the cap member 3 s slee~ed o~er the end 13 of the vessel to the positian shown in Figs. 1 and 2 With the parts positioned as shawn~ a second continuous annular ,Jeld W-2 is effected between -the upper edge 13 of the pressure vessel and the interior wall porti~n 26 of the cap assemb]y 23.
~ s will be apparent from an irlspection of Figs. 1 and 2, by virtue of the upper end 25 of the skirt extending above the edge 13 of the pre~sure vesselg there is defined between the cap 23 and the skirt 17 an annular trough T
for reception of the ~Jeld W-2~ This trough assures that debris from the formation of the weld W-2 will not fall into the interior o~ the bladder with possible consequent damage either immediately from burning or subsequently ~ from the presence of metallic particles. Optionally, and as 2 further precauti.on agair.~st danage to the bladder, the same may be filled ~ith water during formation of the ~r~eld W-2.
~ inally, the ~,ield W-3 is forr:ed, the sarne being a continuous annular ~eld l~hi.ch lin~s the (~.Jn~ardly directe~ e2ge ?~ of the cap 23 with the e~terior wall portion 29 of the pressure vessel 10. It will be understood that -the sequence of formation of the welds ~-2 and ~J-3 is op~ional, After the parts have been connecteci in the manner hereinbefore described~ the cap member 23 may be deformed in~ardly to the configuration shown in Fig. 2 which cperation lrill result in the format~or of a part hemi-sp~leric portion 30 having a narro~Jed central gas port 31, The gas charging fitting 24 may be connected as by wéld 32 to the gas charg~ng port 31 completing the a~sembly of the accumulat3r device, ~ en the completed accumulator is under pressure, the portions of the welds W-2 and W-3 bonded to the exterior wall 29 of the pressure vessel and the inner wall sur.ace 26 of the cap 23 will be subjected to shearing forces and the portianC of the ~Jelds IJ-2 and W-3 bonded to the end 13 of t~e pressure vessel and the end 28 of the cap 23 ~ill be subjected to tension forces, ~ne effectiveness af the retention areas subjected to tension forces to prevent separation of the cap fram the pressu~e vessel is far rT~eater ~han the effective-ness of the retention ~reas subjected to shearing forces, ~:cc-,rdingTl~, an accu"ulatc)r of the typP hOvlng 2 C2p secured by t~lo lelds to a she:ll or pressure vessel c-n ~!ithst2nd far _ ~_ higher pressure before separation of` the cap I'rom the shell than an accumulator of the same type wi-th but a single weld to h~ld the cap and the shell together.
In the embodirnent af Fig. 3 ~jherein like part~
have been given li~e reference numerals~ the ssle dif'ferences bett!Jeen the first descri.bed embodiment resides in the fac~ that the cap rnember 23 a has already been preformed to its part spheri.cal configura-tion, The cap member 23 a includes a gas charging port 31 q of relatively large diameter. Additionally~ the uppermost end 25 a of the skirt 17 a is inclined up-wa.rdly and radially inwardly toward the gas charging port.
By providing the components in the configurati~ns noted, it is possible with the embodiment of Fig. 3 to effect the weld W-2 by inserting a l~7elding rod through the gas charging port 31 A in the direction illustrated by the arrow 33. The bent or inclined configuration Or the upper p~rtisn 25 a of the ski,rt provides additional clearance for insertion of the welding mechanism.
~ s will be apparent t~ th~se skilled in the art numerous variakions in -the described construction and sequence of metho~ steps mab~ be r.ade ~Jithout depzring Irom the spirit of the invent'on. ~!ccsrdingly, the ~ame i.s to be broadly csnstrued ~Jithin the scope of the appended claims.
AI~D METHOD OF l~ .ING Sr~
EACKGROU~D O.' T~E INVENTIO~
EIEI~ OF T~-IE II~TION
The present invention is in the field of aceumul.ltor aevi.ces and rel~tes more partieularly to an aceurnulato deviee ~Jhich comprises a pressure vessel having an oil port at its lower end, a cap rr.ember at lts upper end, a gas eharging valve assembly mounted in the eap rnember and an inlerior bladder assembly~ IJhieh divides the vessel into t.~lo chambe~s in communication respeetlvely with the oil port and thP ~as eharJing valve asseinbly.
THE PRIOR ART
With the proGressively increasing use of hydraulic accumulator devices for energy storage and for pulsation dampening as ~ell as other uses,inereasing emphasis has been plaeed upon eonstructing such aeeurlulators in a manner i.n wh~ieh they may be eeonomieally manufaetured and yet provide a high de~ree of resistance to the precsures ZO to whieh they are sub~'ected in use. l~no~n aceumulators ean be n~anufactured by a proeedure ~hieh i.nvolves forming threat3ed eonnectlorls on the press~ire -~essel and on the cap rr.er~ber u-~ed to clo e one end tl-lereof Such de~.ices a'ter ~sse~:ic~ and ~ith the intraciueti)n bet:Jeen the assembled parts o~ ~ppr:,priate O-rin~s or like gaC~eting ~, are capable Or ~iths-tanding nigh pressures without danger oI axial separati^n of the cap from the pressure vessel.
~owever, it ~ill be readily rec~gnizea that the aperPti3n of f3rming the pressure vecsel and the cap as by 2 forging operation and subsequently r.~achi.ni.ng the nece~sar~J threaded connections ~n the n~ted components is an extrerrely costly one li.miting the r~nge of uses with whlch the accurnulat~r rslay be ec~nornically ernployed.
Numerous me3nC have been suggested for effecti~ely uniting the cap member over the open end of the pressure vessel to effect a pressure resistant connection between such parts. Such means have included rolli.ng steps wherein the metal of the components are deformed into an inter-locking enga~ement. By way of example, of a means of connecting such components by rolling or spinning,reference is made to U.S. Patent 4~2~0,533. As will be readily understood by tho6e skilled in the metal forming art h~-~ever~ rolling or spinning to define sharp bends or interc~nnections is limite~ to metals ~f relatively small thicknes~ and thus accumulators form~d in such manner are n3t suited to high pressure operation. hdditionall.y~ the roll forming of metals about shqr~ bend lines o~ten effects cry~taliz~ti.on of the r.~_tals in the derormed areaC .ith re~ultant lea~en nC
o~ the metallic structures.
~ furt!ler me~l!od in c~r.~mon uce Jor connecti.ll~ the cap carnponents ~r an accurr!ula ,r t~ the pressure -~e~sel -?-3~componen-t involves an assernbling of the noted parts and the formatian of a weld between the outer wall portion of the vessel and the down~Jardly directed surface of the cap. However, in high pressure operations, the weld connection particularly at its interface with the ou-ter wall porti~ns of the pressure vessel has been known to shear or separate with resultant leakage, and under extreme conditions, the cap may be blown clear of its connection to the pressure vessel.
SUM~RY OF THE INVENqION
The present invention r~ay be summarized as directed to an improved accumulator device and method of making same characterized in that the components of the accumulator na~ely, the pressure vessel, the bladder assembly and the cap member are interconnected by a series of three annular welds. Importantly, to the resistance of the assembly to radial and axial f~rces resulting from the high pressure, two of such welds are effected bet~een the cap member and pressure vessel, one being the essentially conventional exterisr weld and another being a continuous annular interior ~Jeld between the upper edge of the vessel and interior ~ide wall portion of the cap. Such construction pr~v-ldes a far higher degree of iadial and axial precsure re~istance l;han the conventi~nal single exterior weld construct ion.
An important aspect of the invention re~ides in the 3~
provi.sion of a mounting skirt weldingly c^nnected to the interior of the pressure vessel and utilized as the support for the bladder assembly. Such mounting skirts are known per se. Ho~ever, in accordance with the instant invention the uppermost end of the skirt is caused to extend a distance above the open mouth po.rtlon of the pressure vessel, whereby there is de~ined bet.ween the i.nterior surface of the cap and the up~ardly extending end portion of the skirt of the bladder assembly, an annular trough for the formation of the interior weld. The provision of such trough acts to prevent the flow of ~Jeld material into the interior of the bladder with resultant damage or destruction of the bladder.
The invention is further directed to a novel method of manufacturing a high pressure resistant vessel in accordance with which method access to the t~eld area formed interiorly of the devi.ce is effected through the aperture i.n the cap which will support the gas charging valve assembly~
In accordance with a further aspect of the method the cap member may be applied in an initially.cylindrical configuration of ~Jall thickness preferably substantially close to tile wall thi.c~ness of the pressure vessel and thereafter s~un or formed into the part nemispherical configuration typically employed in accumulator device , It i.s to be not.ed that the f~rmation by spinning or rolling doe~ not require the production of any sharp berlds whereby such operation is suitable for use l/~ith thick ~/alled --4-- .
13~
materials and does n~t result in metal crystalization pr~blems .
It is accord ingly sn ob ject of the invention to provide a n vel h-.~h pressure resistant accurnulator device A further objiect of the invention is the provision oI an accumu]at~r device of the type described ~;rherein a cap member, t.hich will carry the gas chargin~ valve assembly, is secured to the pressure vessel by two annular ~Jeld connections thus greatly increas ing the resistance to separation ~f the cap from the vessel and hence increasing the pressure capability thereof.
Still a further 3bject of the inven-tion i,5 the provis ion of a method of manufacturing a high pressure resistant hydraulic accumulator device ~rhich includes the step of effecting an interior weld bet.~een the cap member and the upper end of the pressure vessel, such interior ~eld being effec ted through an opening in the cap member which ultimately carries the gas charging valve assembly Still a further ohject of the invention is the provision of a method of rnaking an accumulator ~3evice as descr-, bed ~hi.ch includes the step ;~ f for ning the cap nernber to i~s end c~nfi~,uration after the cap has been eldin~ly connected by bo-th an ini.erior arl~3 e~teri~r ~eld to the body of the prescure vessel.
Thus, in accordance with one aspect of the present invention there is provided an accumulator device comprising a pressure vessel including a closed end having an oil port and an open end, said open end terminating in an upwardly directed edye portion, a bladder subassembly mounted in said open end~ said sub-assembly including an axially elongated metallic mounting skirt having a bladder fixedl~ secured to one end thereof, said mounting skirt being disposed within said vessel with said one end nearest said closed end of said vessel, at least a portion of the outer wall portion of said skirt intimately engaging the inner wall portion of said vessel adjacent said open end, said skirt including an upper end portion e~tending above said open end of said vessel, a cap member having an opening ~or the reception of a gas charging valve, said cap member being positioned in closing relation of said open end, said cap member including a depending skirt outwardly lapping said open end, said cap member including a downwardly directed edge portion, said upper end portion of said skirt, edge portion of said vessel, ~0 and inner wall portion of said cap member to~ether defining an annular trough, a first continuous annular weld connection formed between said mounting skirt and said vessel at engaging portions thereof, a second continuous annular weld connectio~ received within said annular trough and connecting said edge portion and the inner wall portion of said cap member and a third continuous annular weld connection formed between said edge portion of said cap member and outer wal~ portion of said vessel.
In accordance with a further aspect of the present invention there is provided a method of fabricating a ~ - 5a -pressure reslstant accumulator device which includes a pressure vessel having a closed end including an oil port, and an open end having an upwardly directed edge, a bladder assembly including a metallic mounting skirt, and a cap member having an opening for the reception of a gas charginy assembly, said cap member including a depending skirt terminating in a downwardly directed edge, which comprises the steps of so inserting said mounting skirt into said vessel that an upper end portion of said skirt ex-tends above said open end of said vessel, forming a first continuous annular weld connection between said moun-ting skirt and said vessel, causing said skirt of said cap member to be mounted over said open end of said vessel with said upper end portion of said skirt, edge portion of said vessel, and inner wall portion of said cap member together defining an annular trough forming a second continuous annular connection within said annular trough and connecting said edge portion and the inner wall portion of said cap member, and forming a third continuous annular weld connection between said edge portion of said cap and outer wall portion of said vessel.
- 5b -" `:~' ' 3~
~., In order to attain these ob~ects and such other objects as may be hereinafter pointed out reference is made to the accompznying drawings in which:
Fig. 1 is a vertical section21 view thraugh ~
pressure vessel in accord2nce with the invention in a partly finished c~ndition.
Fig. 2 is a magnified fragmentary section of the pressure vessel of Fig. 1 in finished condition.
Fig. 3 is a fragmentary vertical section sirl~ilar to the section of Fig, 2 of a further e~nbodiment of the invention.
Referring now to the drawings there is shown in Fig. 1 a partially finished a~cumulator device which includes a pressure vessel 10 having an oil port 11 at its lower end, an internally threaded nipple 12 being provided to enable the vessel to be connected to the hydraulic line of a system incorporating the accumulat~r.
The pressure vessel 10 includes an open mouth portion defined by the upwardly directed end face or upper edge 13 of the pressure vessel. Preferably~ the eAterior ~rall portion 14 ~f the pressure vessel includes an cnnular groove or recess 15 adj~cent the upper end of tne vessel fnr purp~ses which l'rill appear hereina~'ter, The device includes a bladder assembly 16, s~id assembly including a retainer Member or skirt of metallic ~6_ 3~
~aterial 17 on which is supported a elastomeric bladder member 18. The bladder member 18 may include at its lower end lg~ a ri~ld button 20 kno~rn per se, which button functions in the distended condition of the bladder to seat against the oil port 11 and seal the same. The skirt 17 may include in~ardly directed flange 21 on ~Jhich is mounted b~ a carlbine~ b~nding and adhesion proQess, a thickened rim porti~n 22 of the bladder.
The accumulator device includes a cap member or sub-assembly 23 ~hich will ultimately carry the gas charging valve assembly 24 (see Fi~. 2).
There will now be described the sequence of steps employed to convert or asse~nble the elements hereinabove described to the finished accumulator assembly illustrated in ~ig. 2. As an initial step, the bladder assembly 16 is inserted through the open mouth or end 13 of the pressure vessel in such manner that the uppermost edge 25 of the skirt 17 extends a short distance "d" above the level of the upper edge 13 of the pressure vessel. With the skirt 17 thus positioned relative t~ the pressure vesse~ an annular resistance ~eld Ir-l is .or~ed bet:~een the skirt 17 and the vessel in the area in registry ~ith the groove 15 ~ ~ne p,essure vessel. The purpose of providing the groove or recess 15 i~ to le~ve a rel2tively thin ~etal ~all sect~on 15' in the pressure vessel.
3~2 Preferably the thickness of the wall porti~n 15' ~f the pres~ure vessel aligned with the groove 1~ is substantially identical of the wall thickness of the skirt 17 t~ facilitate the formation of a resistance weld.
After the bladder assembly 15 has been connected to t.he vessel 10, the cap member 3 s slee~ed o~er the end 13 of the vessel to the positian shown in Figs. 1 and 2 With the parts positioned as shawn~ a second continuous annular ,Jeld W-2 is effected between -the upper edge 13 of the pressure vessel and the interior wall porti~n 26 of the cap assemb]y 23.
~ s will be apparent from an irlspection of Figs. 1 and 2, by virtue of the upper end 25 of the skirt extending above the edge 13 of the pre~sure vesselg there is defined between the cap 23 and the skirt 17 an annular trough T
for reception of the ~Jeld W-2~ This trough assures that debris from the formation of the weld W-2 will not fall into the interior o~ the bladder with possible consequent damage either immediately from burning or subsequently ~ from the presence of metallic particles. Optionally, and as 2 further precauti.on agair.~st danage to the bladder, the same may be filled ~ith water during formation of the ~r~eld W-2.
~ inally, the ~,ield W-3 is forr:ed, the sarne being a continuous annular ~eld l~hi.ch lin~s the (~.Jn~ardly directe~ e2ge ?~ of the cap 23 with the e~terior wall portion 29 of the pressure vessel 10. It will be understood that -the sequence of formation of the welds ~-2 and ~J-3 is op~ional, After the parts have been connecteci in the manner hereinbefore described~ the cap member 23 may be deformed in~ardly to the configuration shown in Fig. 2 which cperation lrill result in the format~or of a part hemi-sp~leric portion 30 having a narro~Jed central gas port 31, The gas charging fitting 24 may be connected as by wéld 32 to the gas charg~ng port 31 completing the a~sembly of the accumulat3r device, ~ en the completed accumulator is under pressure, the portions of the welds W-2 and W-3 bonded to the exterior wall 29 of the pressure vessel and the inner wall sur.ace 26 of the cap 23 will be subjected to shearing forces and the portianC of the ~Jelds IJ-2 and W-3 bonded to the end 13 of t~e pressure vessel and the end 28 of the cap 23 ~ill be subjected to tension forces, ~ne effectiveness af the retention areas subjected to tension forces to prevent separation of the cap fram the pressu~e vessel is far rT~eater ~han the effective-ness of the retention ~reas subjected to shearing forces, ~:cc-,rdingTl~, an accu"ulatc)r of the typP hOvlng 2 C2p secured by t~lo lelds to a she:ll or pressure vessel c-n ~!ithst2nd far _ ~_ higher pressure before separation of` the cap I'rom the shell than an accumulator of the same type wi-th but a single weld to h~ld the cap and the shell together.
In the embodirnent af Fig. 3 ~jherein like part~
have been given li~e reference numerals~ the ssle dif'ferences bett!Jeen the first descri.bed embodiment resides in the fac~ that the cap rnember 23 a has already been preformed to its part spheri.cal configura-tion, The cap member 23 a includes a gas charging port 31 q of relatively large diameter. Additionally~ the uppermost end 25 a of the skirt 17 a is inclined up-wa.rdly and radially inwardly toward the gas charging port.
By providing the components in the configurati~ns noted, it is possible with the embodiment of Fig. 3 to effect the weld W-2 by inserting a l~7elding rod through the gas charging port 31 A in the direction illustrated by the arrow 33. The bent or inclined configuration Or the upper p~rtisn 25 a of the ski,rt provides additional clearance for insertion of the welding mechanism.
~ s will be apparent t~ th~se skilled in the art numerous variakions in -the described construction and sequence of metho~ steps mab~ be r.ade ~Jithout depzring Irom the spirit of the invent'on. ~!ccsrdingly, the ~ame i.s to be broadly csnstrued ~Jithin the scope of the appended claims.
Claims (8)
PROPERTY OF PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An accumulator device comprising a pressure vessel including a closed end having an oil port and an open end, said open end terminating in an upwardly directed edge portion, a bladder subassembly mounted in said open end, said sub-assembly including an axially elongated metallic mounting skirt having a bladder fixedly secured to one end thereof, said mounting skirt being disposed within said vessel with said one end nearest said closed end of said vessel, at least a portion of the outer wall portion of said skirt intimately engaging the inner wall portion of said vessel adjacent said open end, said skirt including an upper end portion extending above said open end of said vessel, a cap member having an opening for the reception of a gas charging valve, said cap member being positioned in closing relation of said open end, said cap member including a depending skirt outwardly lapping said open end, said cap member including a downwardly directed edge portion, said upper end portion of said skirt, edge portion of said vessel, and inner wall portion of said cap member together defining an annular trough, a first continuous annular weld connection formed between said mounting skirt and said vessel at engaging portions thereof, a second continuous annular weld connection received within said annular trough and connecting said edge portion and the inner wall portion of said cap member and a third continuous annular weld connection formed between said edge portion of said cap member and outer wall portion of said vessel.
2. An accumulator device in accordance with claim 1 wherein said upper edge portion of said mounting skirt is inclined upwardly and radially inwardly toward said opening in said cap, thereby to expose said edge portion through said opening in said cap member to thus enable said second weld connection to be effected by a welding rod inserted through said opening.
3. An accumulator device in accordance with claim 1 wherein said first weld connection comprises a resistance weld, said vessel including on its outer surface a reduced thickness portion corresponding in wall thickness to that of said skirt and in registry with said first weld connection.
4. An accumulator device in accordance with claim 1 wherein said cap member is roll formed inwardly to define said opening, said roll forming being effected after formation of said first, second and third weld connections.
5. The method of fabricating a pressure resistant accumulator device which includes a pressure vessel having a closed end including an oil port, and an open end having an upwardly directed edge, a bladder assembly including a metallic mounting skirt, and a cap member having an opening for the reception of a gas charging assembly, said cap member including a depending skirt terminating in a down-wardly directed edge, which comprises the steps of so inserting said mounting skirt into said vessel that an upper end portion of said skirt extends above said open end of said vessel, forming a first continuous annular weld connection between said mounting skirt and said vessel, causing said skirt of said cap member to be mounted over said open end of said vessel with said upper end portion of said skirt, edge portion of said vessel, and inner wall portion of said cap member together defining an annular trough forming a second continuous annular connection within said annular trough and connecting said edge portion and the inner wall portion of said cap member, and forming a third continuous annular weld connection between said edge portion of said cap and outer wall portion of said vessel.
6. The method in accordance with claim 5 wherein said second weld connection is effected by inserting mechanism into the interior of said cap through said opening in said cap.
7. The method in accordance with claim 6 wherein said first weld connection is formed in advance of said other weld connections.
8. The method in accordance with claim 7 wherein said cap member is initially generally cylindrical, and including the step of inwardly deforming the end of said cap member opposite said downwardly directed edge to narrow said opening, following the formation of said three weld connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000434251A CA1198032A (en) | 1983-08-10 | 1983-08-10 | Pressure resistant accumulator device and method of making same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000434251A CA1198032A (en) | 1983-08-10 | 1983-08-10 | Pressure resistant accumulator device and method of making same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1198032A true CA1198032A (en) | 1985-12-17 |
Family
ID=4125840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000434251A Expired CA1198032A (en) | 1983-08-10 | 1983-08-10 | Pressure resistant accumulator device and method of making same |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1198032A (en) |
-
1983
- 1983-08-10 CA CA000434251A patent/CA1198032A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0933112B1 (en) | A fluid filter | |
| US4537329A (en) | Tank lining system | |
| CA1136517A (en) | Pressure vessel | |
| US4035306A (en) | Removable cartridge filter | |
| CA1198032A (en) | Pressure resistant accumulator device and method of making same | |
| US5988399A (en) | Spin-on filter | |
| JPS6115095A (en) | Coupler for tank and header plate | |
| US4429718A (en) | Pressure resistant accumulator device | |
| EP0812961B1 (en) | Rubbery marine fenders | |
| US4387915A (en) | Exhaust system pipe and exhaust system with such a pipe | |
| US4318421A (en) | Float controlled syphon valve for swimming pool cover | |
| CA1145650A (en) | Replaceable bladder accumulator device | |
| US4506431A (en) | Method of making pressure resistant accumulator device | |
| US4295492A (en) | Low cost accumulator device | |
| EP0517436B1 (en) | Link rod of wiper for motor vehicle and method of manufacturing the same | |
| CN211951658U (en) | Transmission part in pressure water valve | |
| CN219333405U (en) | Novel oil filter | |
| GB2062761A (en) | Pressure vessel assemblies | |
| CN2149421Y (en) | Inserting type guide tube head for placing concrete in under-water work-side | |
| CN216242238U (en) | Welded structure and pressure vessel with same | |
| CN218818285U (en) | Tapered self-matching plug valve | |
| US4305522A (en) | Locking cap with a spring seat between the outer cap and inside cover | |
| CA1300048C (en) | Low load pipe for pipe jacking | |
| CA1247591A (en) | Tank header plate connection | |
| JPH088382Y2 (en) | Cast iron pipe joint for hot water piping |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |