CN1243193C - 6.8 liter aluminium inner lining carbon fiber full winding composite gas cylinder - Google Patents
6.8 liter aluminium inner lining carbon fiber full winding composite gas cylinder Download PDFInfo
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- CN1243193C CN1243193C CN 200310109066 CN200310109066A CN1243193C CN 1243193 C CN1243193 C CN 1243193C CN 200310109066 CN200310109066 CN 200310109066 CN 200310109066 A CN200310109066 A CN 200310109066A CN 1243193 C CN1243193 C CN 1243193C
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Abstract
The present invention relates to a 6.8 liter aluminium inner lining carbon fiber full winding composite gas cylinder. An aluminium inner lining which is formed by the smooth and seamless connection of an elliptic curved surface tail end, a barrel body part, an elliptic curved surface neck part and a cylinder opening with inner threads is taken as a core mould; carbon fiber layers are orderly wound on a spreading layer which is optimally designed on the surface of the aluminium inner lining; a glass fibre shock resisting protective layer is wound on the outer surface of the carbon fiber layers; the aluminium inner lining is treated by the self-tightening technology in the manufacturing process; a longitudinally and spirally winding fiber layer and an annularly winding fiber layer are alternately wound around the barrel body part of the aluminium inner lining; carbon fiber layers are longitudinally and spirally wound around the elliptic curved surface tail end and the elliptic curved surface neck part at variable angles; annular thickening winding is used for both end parts of the barrel body at the connecting part of the elliptic curved surface tail end and the elliptic curved surface neck part. The composite gas cylinder of the present invention satisfies the reasonable stress field distribution; the present invention ensures that the composite gas cylinder can bear the maximal bursting pressure under the condition of the least fiber using amount; the composite gas cylinder has the advantages of good persistent air tightness and optimal safety performance.
Description
Technical field:
The present invention relates to a kind of 6.8 liters of aluminum liner carbon fibers and twine composite cylinder entirely, is the often high-pressure air feed equipment of the complete portable respiratory aid of use of fields such as fire-fighting, mining, chemical industry, is used for store various types pressurized gas under the 30MPa high pressure conditions.
Background technique:
Twine the container that composite cylinder is a kind of storing compressed air or oxygen entirely 6.8 rise the aluminum liner carbon fiber, it is the high-pressure air feed device of all kinds of relief resuscitation apparatuss, compare with the steel gas cylinder of same volume, same working pressure, its weight has only 1/2nd of similar steel gas cylinder.The steel gas cylinder is as contingency, it breaks and belongs to sudden clastotype, and the aluminum liner carbon fiber twines composite cylinder entirely because of the continuous fiber existence is arranged, break and belong to cracking, leakage pattern, do not have fragment and fly out and hurt sb.'s feelings, its Safety performance, fatigue life, decay resistance, the anti-performance of burning all are much better than similar steel gas cylinder with the performance of holding one's breath.
The aluminum liner carbon fiber twines the design of composite cylinder and manufacturing and steel gas cylinder entirely and belongs to two distinct fields, and being needs the high frontier explored.The design of composite cylinder, the authentication credential of produce and market are mainly twined according to the DOT-CFFC standard of the U.S. or the HSE-AL-FW2 standard in Europe as judgement (6.8 liter capacities/30MPa working pressure) aluminum liner carbon fiber entirely in National Quality ﹠ Technology Inspection Bureau at present.The key technical indexes by the full wound composite gas cylinder of aluminum liner carbon fiber of DOT-CFFC standard design, manufacturing is: safety coefficient n 〉=3.4, fatigue life cycle N 〉=10000 (inferior); The key technical indexes by the full wound composite gas cylinder of aluminum liner carbon fiber of HSE-AL-FW2 standard design, manufacturing is: safety coefficient n 〉=3.0, fatigue life cycle N 〉=3750 (inferior).Therefore, the DOT-CFFC standard of the U.S. will be higher than the HSE-AL-FW2 standard in Europe.
Some developed countries have all used the aluminum liner carbon fiber to twine composite cylinder entirely and have substituted similar steel gas cylinder in the world at present.The full wound composite gas cylinder of the aluminum liner carbon fiber of domestic present use is mainly by external import, and domestic indivedual units have also developed such composite cylinder recently.But the full wound composite gas cylinder of the aluminum liner carbon fiber of domestic present use all is the HSE-AL-FW2 standard by Europe to be designed and makes, and its key technical indexes is all far below the DOT-CFFC standard of the U.S..
In the Chinese patent " high pressure composite cylinder formula oxygen tidal air " (ZL 98236546.2), provided the design that a kind of aluminum liner carbon fiber twines composite cylinder entirely by the HSE-AL-FW2 standard.Their DESIGNED FEATURE only is on the ultra-thin aluminum alloy liner, carries out hoop earlier and twines several layers, and spiral twines several layers again, back and forth several circulations according to said method, and fiber is impregnation in winding process.Such shop layer design do not provide theoretical foundation, randomness arranged, and can not bring into play the bulk strength of composite cylinder structure to greatest extent.In addition, in their invention, do not mention the aluminum liner carbon fiber is twined ' self-tightening ' treatment technology that composite cylinder carries out necessity entirely, thereby make to maintain a very low level fatigue life of this composite cylinder.According to their invention design, 6.8 rising carbon fiber twines the aluminum liner composite cylinder entirely and is satisfying under the condition of minimum fiber consumption, its safety coefficient n 〉=3.0 (bursting pressure is 90 (MPa)), fatigue life N 〉=3750 (inferior), the weight W of empty bottle=4.2 (kg) are far below the international most advanced level (the DOT-CFFC standard of the U.S.) of this series products.
Because the designability of composite structure, twine composite cylinder entirely for the aluminum liner carbon fiber of different shop layer designing institute manufacturings, its structural behaviour has very big difference.Have only and utilize the virtual emulation technology that the structure shop layer that the aluminum liner carbon fiber twines composite cylinder entirely is optimized design, and ' self-tightening ' pressure of determining the best by the numerical simulation that ' self-tightening ' handled carries out ' self-tightening ' processing to corresponding composite cylinder in manufacture process, could improve to greatest extent its fatigue life, and make the key technical indexes that 6.8 liters of aluminum liner carbon fibers twine composite cylinder entirely reach advanced world standards fully (the DOT-CFFC standard of the U.S.).
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, provide a kind of novel 6.8 liters of aluminum liner carbon fibers to twine composite cylinder entirely, make it to have light as far as possible weight, and can satisfy the requirement of the U.S. DOT-CFFC standard of representing international most advanced level.
For realizing such purpose; the present invention is to twine by the stacking sequence of optimal design on core, the aluminum liner surface to twine glass fibre on carbon fiber layer, its outer surface as the shock resistance protective layer with seamless aluminum liner, utilizes ' self-tightening ' treatment technology that composite cylinder is carried out ' self-tightening ' in manufacture process and handles.
The functional requirement that the present invention is twined composite cylinder entirely according to 6.8 liters of aluminum liner carbon fibers adopts the composite structure finite element that the aluminum liner carbon fiber is twined the optimal design that composite cylinder carries out stacking sequence entirely.6.8 rising the main bearing structure that the aluminum liner carbon fiber twines composite cylinder entirely is made up of aluminum liner and carbon fiber winding layer.
Aluminum liner is by oval calotte tail end, shell portion, oval calotte neck and contains the smooth seamless link of internal screw finish and form.Carbon fiber winding layer on the aluminum liner shell portion is to twine layer of fibers (angle of fiber reinforcement direction and the vertical symmetry axis of composite cylinder is less than 20 °) and hoop winding layer of fibers (angle of fiber reinforcement direction and the vertical symmetry axis of composite cylinder equals 90 °) by longitudinal spiral alternately to be entwined by the stacking sequence of optimal design gained; the oval calotte tail end of aluminum liner and oval calotte neck carbon fiber layer twine layer of fibers for the varied angle longitudinal spiral; adopting hoop to thicken winding, twine the shock resistance protective layer of glass fibre layer on the surface of the full winding layer of carbon fiber as composite cylinder with the cylindrical shell two end part of oval calotte tail end and oval calotte neck joint.
The aluminum liner that 6.8 liters of aluminum liner carbon fibers of the present invention twine composite cylinder entirely is that carbon fiber twines the composite cylinder endothecium structure entirely, is L by rise
0Oval calotte tail end, internal diameter be that D, length are L
1Shell portion, rise be L
2The oval calotte neck and to contain internal thread be that M18, length are L
3The smooth seamless link of bottleneck form geometric parameter L wherein
0, L
2Choose and make the hoop working stress of oval calotte of gas cylinder tail end and neck approach zero, and D, L
1, to choose be that the volume that will guarantee composite cylinder equals 6.8 liters, wall thickness t≤the 2mm of aluminum liner choose be to guarantee its under the situation of minimum weight, composite cylinder handles the aluminum liner maintenance elastic deformation of back under hydraulic test pressure through ' self-tightening ', scribble one deck anti-electrocorrosion coating on the aluminum liner outer surface, then the T700-12KC carbon fiber is wrapped in moulding on the aluminum liner entirely.
The carbon fiber winding layer of aluminum liner shell portion is to twine layer of fibers (angle of fiber reinforcement direction and the vertical symmetry axis of composite cylinder is less than 20 °) and hoop winding layer of fibers (angle of fiber reinforcement direction and the vertical symmetry axis of composite cylinder equals 90 °) by longitudinal spiral alternately to be entwined by the stacking sequence of optimal design gained; The cotton yarn tape sheet total number that vertically twines a full circulation layer is M (bar/circulation layer), 0.68L in the middle of cylindrical shell
1It is b (mm/ bar) that part adopts the winding of hoop uniform thickness, its cotton yarn tape sheet width; For guarantee composite cylinder break initial cylindrical shell middle part, belong to cracking, leakage pattern, with the cylindrical shell two end part L of oval calotte tail end and oval calotte neck joint
4=0.16L
1The zone adopts hoop to thicken winding, during winding cotton yarn tape wide be b
0=0.85b (mm/ bar); The tail end of aluminum liner and the oval calotte of neck only have the layer of fibers that twines along curved surface geodesic curve longitudinal spiral, and its stacking sequence is consistent with the longitudinal spiral winding layer of fibers of cylindrical shell; The last glass fibre layer of winding of one deck longitudinal spiral and the winding of one deck hoop that twines on the surface of the full winding layer of carbon fiber is as the shock resistance protective layer.
The material behavior of aluminum liner is satisfied among the present invention waits to sclerosis Von Mises plastic yield criterion, and the carbon fiber winding layer satisfies the maximum tension stress failure criterion for the linear elasticity material.For 6.8 liters of aluminum liner carbon fibers that improve the present invention design twine fatigue life, the air-tightness of composite cylinder entirely, need to handle numerical simulation determined " self-tightening " pressure P according to " self-tightening "
zComposite cylinder after the moulding is carried out " self-tightening " to be handled, being about to aluminum liner carbon fiber after the moulding twines pressure that the composite cylinder pressurization surpasses certain hydrostatic test regulation entirely and makes the aluminum liner of composite cylinder enter state of plastic deformation fully, unload and be depressed into zero then, make the aluminum liner of composite cylinder under zero pressure, present compressive stress state, and the full winding layer of carbon fiber presents tensile stress state, guarantee that under given working pressure and hydraulic test pressure the aluminum liner that 6.8 liters of aluminum liner carbon fibers twine composite cylinder entirely is in elastic deformation fully.
6.8 liters of aluminum liner carbon fibers of the present invention design twine composite cylinder entirely and can be undertaken Wrapping formed by certain stacking sequence and technology mode at an easy rate and by handling numerical simulation determined ' self-tightening ' pressure P by ' self-tightening '
zComposite cylinder after the moulding is carried out ' self-tightening ' to be handled.Composite cylinder of the present invention satisfies the rational Stress Field Distribution that U.S. DOT-CFFC design code requires, guarantee that composite cylinder is using minimum fiber consumption (can bear maximum bursting pressure (safety coefficient n 〉=3.4) under the condition of the heavy W of empty bottle≤3.9kg), make to destroy and tear the cylindrical shell position that originates in composite cylinder, no fragment, the aluminum liner of composite cylinder is in elastic deformation all the time under given working pressure, guarantees that this composite cylinder has lasting (fatigue life cycle N 〉=10000 time) good air-tightness and best Safety performance.
Description of drawings:
Fig. 1 twines the structural drawing of composite cylinder entirely for 6.8 liters of aluminum liner carbon fibers of the present invention.
Among Fig. 1, the shell portion of 1 expression aluminum liner, the oval calotte tail end of 2 expression aluminum liners, the oval calotte neck of 3 expression aluminum liners, the bottleneck of 4 expression aluminum liners, the oval calotte tail end of 6 expression aluminum liners and the longitudinal spiral of oval calotte neck twine layer of fibers [± α
1/ ± α
2/ ± α
3/ ± α
4] wherein: α
iThe angle of (i=1,2,3,4) expression fiber reinforcement direction and composite cylinder symmetry axis, L
0The rise of expression gas cylinder oval calotte tail end, L
1The cylindrical shell length of expression composite cylinder, L
2The rise of expression gas cylinder oval calotte neck, L
3Expression contains the bottleneck length of internal thread M18, L
4Be illustrated in zone that the cylindrical shell two ends present moment of flexure, adopt hoop to thicken the length of winding, D represents the internal diameter of composite cylinder cylindrical shell.
Fig. 2 twines the partial sectional view of the structural drawing 1 shell portion A of composite cylinder entirely for 6.8 liters of aluminum liner carbon fibers of the present invention.
Among Fig. 2, t represents the wall thickness of aluminum liner cylindrical shell, 5 expression anti-electrocorrosion coatings, and 7 expression aluminum liner shell portion carbon fibers strengthen winding layer [± α
1/ H
3/ ± α
2/ H
2/ ± α
3/ H
2/ ± α
4/ H
2] wherein: H
iExpression i layer hoop winding layer, 8 expression shock resistance glass fibre protective layers.
Fig. 3 twines composite cylinder 1/8th structures limited element calculation model of (by neck) entirely for 6.8 liters of aluminum liner carbon fibers of the present invention.
Among Fig. 3,1 expression composite cylinder cylindrical shell position, the position of 3 expression composite cylinder oval calotte necks.
Fig. 4 twines the composite cylinder cylindrical shell entirely for aluminum liner carbon fiber of the present invention, the stacking sequence at position 1 among Fig. 3.Wherein, Theta represents the angle between fiber reinforcement direction and the composite cylinder cylindrical shell hoop.
Fig. 5 twines the composite cylinder neck entirely for aluminum liner carbon fiber of the present invention, the stacking sequence at position 3 among Fig. 3.Wherein, Theta represents the angle between fiber reinforcement direction and the composite cylinder cylindrical shell hoop.
Embodiment:
Below in conjunction with drawings and Examples technological scheme of the present invention is further described.
6.8 liters of aluminum liner carbon fibers of the present invention twine full composite cylinder be core with the aluminum liner, utilize fiber winding machine, the T700-12KC carbon fiber be wrapped in moulding on the aluminum liner entirely by the stacking sequence of optimal design, its structure is as depicted in figs. 1 and 2.Embodiment is:
1) among Fig. 1 and Fig. 2, the physical dimension of shown aluminum liner is taken as respectively: the length of cylindrical shell 1 is L
1=414mm, inside diameter D=140mm, the rise L of oval calotte tail end 2
0=0.31D, the rise L of oval calotte neck 3
2=0.3D, containing internal thread is the length L of the bottleneck 4 of M18
3=55mm, wall thickness t=1.8mm, the volume that guarantees composite cylinder of the present invention is 6.8 liters.
2) on the outer surface of aluminum liner, smear the very thin polyurethane varnish of one deck as anti-electrocorrosion coating 5.
3) the T700-12KC carbon fiber bundle immerses behind the epoxy resin according to certain design tension force T, is wrapped on the aluminum liner by the stacking sequence of optimal design; Wherein the stacking sequence of aluminum liner shell portion carbon fiber winding layer 7 is:
[±α
1/H
3/±α
2/H
2/±α
3/H
2/±α
4/H
2]，
The stacking sequence that the oval calotte tail end of aluminum liner and the longitudinal spiral of oval calotte neck twine layer of fibers 6 is:
[±α
1/±α
2/±α
3/±α
4]
Wherein: α
iThe angle of (i=1,2,3,4) expression fiber reinforcement direction and composite cylinder symmetry axis is respectively: α
1=12 °; α
2=15 °; α
3=17 °; α
4=α
1, H
iExpression i layer ring asked winding layer.
4) carbon fiber winding layer 6 and 7 winding process parameter:
T700 (K12-Tex800) folded yarn number of share of stock is: N=3 (thigh/bar), vertically twining full circuit cotton yarn tape sheet total number is: M=70 (bar/circulation layer), the cotton yarn tape sheet width that the hoop uniform thickness twines is: b=7.0 (mm/ bar), locating L with the cylindrical shell two ends that the oval calotte tail end is connected with the oval calotte neck
4Adopt hoop to thicken winding in the zone of=80mm, during winding cotton yarn tape wide be b
0=6 (mm/ bars).
6), the mean tension of single-stranded fiber when twining: T=10～15 (N/ thigh), and in winding process, suitably control epoxy resin content, guarantee that fiber volume fraction is V
f=0.63 ± 0.02.
7) adopt 2 strands of glass fiber yarns to twine on carbon fiber layer, vertical circulation layer, a cotton yarn tape sheet total number are: M
b=64 and one deck hoop winding layer strap width be: b
b=7 (mm/ bars) are as shock resistance glass protective layer 8.
8) put into curing oven and be cured moulding.
9) the aluminum liner carbon fiber behind the solidifying is twined full composite cylinder according to numerical simulation determined ' self-tightening ' pressure P
z=58MPa carries out ' self-tightening ' to composite cylinder to be handled.
Twine the limited element calculation model of composite cylinder entirely shown in Fig. 3-5 according to 6.8 liters of aluminum liner carbon fibers, according to numerical simulation determined ' self-tightening ' pressure composite cylinder is carried out after ' self-tightening ' handle, the aluminum liner of composite cylinder is in elastic deformation fully under hydrostatic test effect, guarantees volume rate of residual V
δ≤ 2%, improve its fatigue life.Result of finite element shows that aluminum liner carbon fiber of the present invention twines composite cylinder entirely after ' self-tightening ' handled, Stress Field Distribution rationally, can be that to be subjected to maximum bursting pressure be that the bursting pressure value 116MPa of 114MPa and actual tests is very approaching.
6.8 liters of aluminum liner carbon fibers according to specific embodiment of the invention manufacturing twine composite cylinder entirely, have light as far as possible weight, and can satisfy the requirement of the U.S. DOT-CFFC standard of representing international most advanced level.Its key technical indexes is:
1) weight W of empty bottle≤3.9 (kg),
2) hydraulic test pressure effect lower volume rate of residual V
δ≤ 2% (requirement of DOT-CFFC standard
V
δ≤5％)，
3) safety coefficient n=3.8 (DOT-CFFC standard require n 〉=3.4),
4) fatigue life cycle N 〉=10000 (inferior).
Claims (2)
1, a kind of 6.8 liters of aluminum liner carbon fibers twine composite cylinder entirely, it is characterized in that by internal diameter being that D=140mm, length are L
1The cylindrical shell of=414mm (1), rise are L
0The oval calotte tail end (2) of=0.31D, rise are L
2The aluminum liner that the smooth seamless link of the oval calotte neck (3) of=0.3D is formed is a core, on aluminum liner, twine carbon fiber layer, comprise that the longitudinal spiral of aluminum liner oval calotte tail end and oval calotte neck twines the carbon fiber winding layer (7) of layer of fibers (6) and aluminum liner shell portion, the glass fibre layer that the glass fibre layer that winding one deck longitudinal spiral twines on the carbon fiber layer outer surface and one deck hoop twine is as shock resistance protective layer (8); The stacking sequence of described aluminum liner shell portion carbon fiber winding layer (7) be [± 12 °/(90 °)
3/ ± 15 °/(90 °)
2/ ± 17 °/(90 °)
2/ ± 12 °/(90 °)
2], the stacking sequence that the longitudinal spiral of aluminum liner oval calotte tail end and oval calotte neck twines layer of fibers (6) is [± 12 °/± 15 °/± 17 °/± 12 °], T700 (K12-Tex800) folded yarn number of share of stock is: N=3 thigh/bar, vertically twining full circuit cotton yarn tape sheet total number is: M=70 bar/circulation layer, hoop uniform thickness winding zone (L
1-2L
4) in cotton yarn tape sheet width be: the b=7.0mm/ bar is being L near composite cylinder cylindrical shell and oval calotte tail end and oval calotte neck joint length
4Adopt hoop to thicken winding in the cylindrical shell zone of=80mm, during winding cotton yarn tape wide be b
0=6mm/ bar, the mean tension of single-stranded fiber during winding: T=10～15N/ thigh, and in winding process, control epoxy resin content, guarantee that fiber volume fraction is V
f=0.63.
2,6.8 liters of aluminum liner carbon fibers as claimed in claim 1 twine composite cylinder entirely, it is characterized in that the composite cylinder after the moulding carries out " self-tightening " processing through the pressure of Pz=58MPa, composite cylinder pressurization after the moulding soon, make the aluminum liner of composite cylinder enter state of plastic deformation fully, unload then and be depressed into zero, make the aluminum liner of this composite cylinder under zero pressure, present compressive stress state, and the carbon fiber winding layer presents tensile stress state, guarantee under given working pressure and hydraulic test pressure, the aluminum liner of composite cylinder is in elastic deformation fully, its volume rate of residual V
δ≤ 2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310109066 CN1243193C (en) | 2003-12-04 | 2003-12-04 | 6.8 liter aluminium inner lining carbon fiber full winding composite gas cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310109066 CN1243193C (en) | 2003-12-04 | 2003-12-04 | 6.8 liter aluminium inner lining carbon fiber full winding composite gas cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1546901A CN1546901A (en) | 2004-11-17 |
| CN1243193C true CN1243193C (en) | 2006-02-22 |
Family
ID=34335008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310109066 Expired - Fee Related CN1243193C (en) | 2003-12-04 | 2003-12-04 | 6.8 liter aluminium inner lining carbon fiber full winding composite gas cylinder |
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2003
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