AU2001234259A1 - Fibre-reinforced pressure vessel and method of manufacturing fibre-reinforced pressure vessel - Google Patents
Fibre-reinforced pressure vessel and method of manufacturing fibre-reinforced pressure vesselInfo
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- AU2001234259A1 AU2001234259A1 AU2001234259A AU2001234259A AU2001234259A1 AU 2001234259 A1 AU2001234259 A1 AU 2001234259A1 AU 2001234259 A AU2001234259 A AU 2001234259A AU 2001234259 A AU2001234259 A AU 2001234259A AU 2001234259 A1 AU2001234259 A1 AU 2001234259A1
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- fibre
- pressure vessel
- reinforced
- filaments
- vessel according
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Description
FIBRE-REINFORCED PRESSURE VESSEL AND METHOD OF MANUFACTURING A FIBRE-REINFORCED PRESSURE VESSEL
The invention relates to a fibre-reinf orced pressure vessel comprising a rigid gas- or .fluid-tight body overwound with fibre filaments. The invention also relates to a method of manufacturing a fibre-reinforced pressure vessel comprising a rigid gas- or fluid-tight body overwound with fibre filaments.
Known .fibre-reinforced pressure vessels comprise a rigid gas- or fluid-tight body overwound with fibre filaments. During the manufacturing of fibre-reinforced pressure vessels fibre filaments are applied in certain patterns, so that when the pressure vessel is under internal pressure the fibre filaments can absorb tensile stresses. Prior to, during or after winding, a binder or resin ( a so-called matrix material) is applied to the body which is (to be) overwound or to the fibre filaments. .After winding, the matrix material is cured so that the fibre filaments are incorporated in a matrix (the binder or resin). In fibre-reinforced pressure vessels the ma- trix serves to transfer shear stresses from one fibre filament to another or to the gas- or fluid- tight body when the pressure vessel is under internal pressure. Sometimes extra windings are applied to (sections of) the gas- or fluid-tight body in order to absorb mechanical loads resulting from inter alia shear stresses.
Known methods of manufacturing fibre-reinforced pressure vessels comprise a solidif i- cation or curing step in order to incorporate the wound fibre filaments in a matrix. Curing takes time, usually 6 to 8 hours.
A disadvantage of known pressure vessels ajnd methods of manufacturing the same is the need for a solidification or curing step which usually lasts 6 to 8 hours. .Another disadvantage is that for absorbing mechanical loads resulting from inter alia shear stresses extra wind- ings are sometimes necessary.
It is an objective of the invention to provide an improved pressure vessel. It .is another objective of the invention to provide a reduction of production costs of fibre-reinforced pressure vessels. It is yet another objective of the invention to provide an improved method of manufacturing fibre-reinf orced pressure vessels. According to a first aspect of the invention one or more objectives are achieved with a
.fibre-reinforced pressure vessel comprising a rigid gas- or fluid-tight body overwound with .fibre filaments, whereby at least a number of fibre filaments can move freely with respect to one another and the fibre filaments are wound such that when the pressure vessel is under internal pressure the fibre filaments are loaded exactly in their longitudinal direction.
Since the fibre filaments are wound such that, when the pressure vessel .is under internal pressure, they are loaded only longitudinally, they will remain in place during use and a matrix will not be requ.ired.
It is further achieved that only just as much fibre material needs to be used as is neces- sary for exactly absorbing the mechanical stresses in the pressure vessel. No extra fibre filaments are necessary, leading to a reduction in weight and to lower costs as compared to known pressure vessels.
Since at least a number of fibre filaments can move freely with respect to one another and the fibre filaments are wound such that when the pressure vessel is under intetnal pres- sure the fibre filaments are loaded exactly in their longitud.inal direction, the fibre filaments in that section of the pressure vessel will be displaced with respect to one another when the pre s- sure vessel for example is damaged.
Preferably, the fibre filaments can move freely with respect to one another throughout the whole of the pressure vessel. This is advantageous in that no matrix material (for example, res.in) at all needs to be used. This makes a curing step superfluous and it leads to lower costs as compared to known pressure vessels.
Preferably, the pressure vessel according to the invention has an isotensoid shape, that is, a shape whereby when the pressure vessel is under internal pressure the mechanical stresses are distributed equa y among the fibre filaments. In order to provide the pressure vessel with the desired isotensoid shape a means for axially strengthening the pressure vessel may be used.
Since an .isotensoid shape is used, only a minimum number of fibre filaments are needed in order to absorb the mechanical stresses in the pressure vessel. Moreover preferably, the pressure vessel according to the invention has a cylindrical shape which is provided with isotensoid end pieces at both longitudinal ends thereof.
By providing the pressure vessel with a cylindrical shape, it is suitable for use as a gas flask.
Preferably, the pressure vessel according to the invention is provided with a protective layer, a so-called coating.
A coating comprising synthetic rubber is particularly suitable as a protective means against fire and against small impact and handling loads.
Preferably, the rigid body of a pressure vessel according to the invention is made of high-density polyethene (HDPE) and the fibre filaments are carbon filaments.
This combination of materials is advantageous from the viewpoint of production costs and the weight and strength of the pressure vessel.
Preferably, the rigid body of a pressure vessel according to the invention is made of high-density polyethene (HDPE) and the fibre filaments are glass fibres. This combination of materials, too, is advantageous from the viewpoint of production costs and the weight and strength of the pressure vessel.
A pressure vessel according to the invention can be manufactured in different embodiments and thus be made suitable for different maximum .internal pressures.
Accord.ing to a second aspect of the invention one or more objectives are achieved through a method of manufacturing a fibre-reinforced pressure vessel comprising a rigid gas- or fluid-tight body overwound with fibre filaments, whereby the method of manufacturing comprises the steps of: a) providing a rigid gas- or fluid-tight body, fibre filaments and a winding app a- ratus; b) overwinding the rigid body such that at least a number of fibre filaments can move freely with respect to one another and the fibre filaments are wound such that when the pressure vessel is under internal pressure the fibre filaments are loaded exactly in their longitudinal d.irection;
whereby no matrix material (for example, resin) is provided such that the fibre filaments would be incorporated in a matrix for that section of the pressure vessel in which the fibre filaments can move freely with respect to one another.
By this it is achieved that no more fibre material is used th that what is necessary for exactly absorbing the mechanical stresses in the pressure vessel. This leads to a reduction of the costs of manufacturing of the pressure vessel.
Preferably, no matrix material at all is provided for in the method according to the invention. By not providing for a matrix material in the pressure vessel a curing step is made superfluous. By this a shortening of the production time is achieved with respect to the time which would otherwise be needed for solidification or curing, which usually is 6 to 8 hours.
The invention is .illustrated by way of two embodiments of the pressure vessel and one embodiment of the method of manufacturing the pressure vessel with reference to the accom- panying drawings.
Figure 1 depicts a first embodiment of the pressure vessel according to the invention having an isotensoid shape;
Figure 2 depicts a second embodiment of the pressure vessel according to the invention having a cylindrical shape;
Figure 3 is an axial cross-section view of an end of the pressure vessel of Figure 2; Figures 4A and 4B depict cross-sectional views of an example of the rigid body of a pressure vessel with fibre filaments abutting the rigid body according to the invention; and Figure 5 depicts schematically the mechanical load on a fibre filament in its longitud i- nal direction according to the invention.
Referring to the drawings the two given embod.iments of the pressure vessel according to the invention are now described.
Figure 1 depicts a first embodiment of the pressure vessel according to the invention. The pressure vessel (1) comprises a rigid gas- or fluid-tight body (2) having an isotensoid shape. There are fibre filaments (3) wound around the rigid body (2). There is also an auxiliary means (4). In this example the auxiliary means (4) is a means for axially strengthening the pressure vessel (1). The aux.Uiary means (4) is provided with means (5), screw holes in this e x- ample, with which an appendage (not shown) such as a closure member or a pressure valve can be attached to the pressure vessel (1).
Figure 2 depicts a second embodiment of the pressure vessel according to the invention. The pressure vessel (6) comprises a rigid gas- or fluid-tight body (7) having a cylindrical shape. The cylindrical body (7) is provided with an end-piece (8) having an isotensoid shape. The cylindrical rigid body (7) is shown mounted on a rotation-axis (9) which is used for winding fibre filaments around the rigid body (7). The rigid body (7) has several filaments (10) overwound in the circumferential direction of the rigid body (7) (so-called 'hoop windings') and several filaments (11) overwound in the longitudinal direction of the rigid body (7) (so-called 'helical or polar windings').
The rigid body may comprise a thin layer of metal, a thermoplastic or thermo-setting material, provided that the material meets the safety specifications applicable for the substance to be contained in the pressure vessel.
The fibre material is preferably carbon fibre, but it can also be any other fibre type which can be subjected to tensile stresses, such as E-type, R-type or S-type glass fibre, p- aramide fibre, carbon fibre or fibres of polymers such as polyethene, polyester or polyamide.
Figure 3 depicts an axial cross-section view of an end of the pressure vessel (6) according to Figure 2. It shows an end (12) of the cylinder-shaped rigid gas- or fluid-tight body (13) and an auxiliary member (14) bordering the rigid body (13). In this example the auxiliary member (14) and the rigid body together provide the end (12) with an isotensoid shape. In this example there are also openings (15) and (16) in the axial direction of the pressure vessel (6). This embodiment also depicts how the rigid body (13) and the auxiliary member (14) together have been overwound with a layer (17) of fibre filaments (which are shown schematically).
Figures 4A and 4B depict cross-sectional views of an example of the positions of fibre filaments (18) lying against (abutting) the rigid body (19) of a pressure vessel according to the invention. n this example the fibre filaments (18) are in a cubic closest packing. Figure 4B also shows a coating (20) which has been applied to the fibre filaments.
Figure 5 depicts the load with respect to an arc (AD) of a fibre filament when the pressure vessel is under internal pressure (f) and the resulting reaction force (F) of the arc (AD) of the fibre filament. R represents the radius of the rigid body and dv represents the arc angle. The fibre filament, of course, also exerts a normal force on the rigid body.
The following is a description of an example of the method of manufacturing - according to the invention- a fibre-reinforced pressure vessel comprising a rigid gas- or fluid- tight body overwound with fibre filaments. One first determines the function of the pressure vessel and selects the materials to be used for the pressure vessel. Next, one determines a design, that is, the shape of the apparatus including parameters such as the volume and dimensions of the vessel, the maximum allowable internal pressure, safety factors, and the dimensions of the outflow openings in the pressure vessel. A suitable production process is also selected. According to the invention the process is w.inding with fibres ('filament winding'). For this process one determines a winding pattern appropriate in regard of the shape of the pressure vessel whereby in the winding pattern the fibre filaments are overwound such that at least a number of fibre filaments can move freely with respect to one another and when the pressure vessel .is under internal pressure the fibre filaments are loaded exactly in their longitudinal direction. The rigid body thereby is not to contribute to the absorption of mechartical stresses resulting from the internal pressure. The rigid body can be manufactured according to any known method, for example a method using a mould and blow moulding or spray moulding or rotation moulding. Subsequently, the rigid body .is mounted on a winding apparatus ('filament winding machine'). After setting the controls of the w.inding apparatus the leading end of a filament to be wound is attached to the rigid body, the rigid body is overw ound and the end of the wound filament is fastened. Some-
times the winding pattern is applied in several stages. In the case of a cylinder-shaped rigid body for example, .filaments overwound in the circumferential direction (so-called 'hoop windings') and filaments overwound in the longitudinal direction (so-called 'helical or polar windings') are, for example, applied separately. When applying filaments in the longitudinal direction (so-called 'helical or polar windirtgs') first an auxiliary member is positioned against the rigid body and then the auxiliary member is also overwound with fibre filaments. .After the rigid body has been completely overwound, the pressure vessel is optionally provided with a coating, preferably of synthetic rubber. The pressure vessel is optionally provided with an appendage. The fibres are applied by means of winding, so-called filament winding. Since the fibre filaments are overwound such that, when the pressure vessel is under internal pressure, they are loaded only in their longitudinal direction, they will stay in position during use and a m a- trix will not be necessary. Preferably, no matrix material (for example, resin) at all is provided.
The fibres are not impregnated or glued or fastened to the rigid body, of course except for the leading end of the very first fibre filament to be overwound. Attachment of the fibre filament can also take place by forming a .knot in the fibre filament. Impregnation is usually understood to include partial or complete penetration of any matrix material in or between the fibre filaments. Thus, in the pressure vessel according to the invention no matrix material penetrates in or between the fibre filaments because no matrix material is used. Matrix material is usually a resin, synthetic resin or an elastomer. Furthermore, the rigid body can move freely with respect to the fibre filaments.
In the method according to the invention there is no solidification or curing step at all, thus not prior to, during or after winding.
Optionally, a flexible or a rigid protective layer, a so-called coating, can be provided on top of the fibre filaments. This coating is fire-proof and not constructively supporting, and it serves only to protect the fibre filaments against external influences such as cutting or abrasive actions, chemicals and against the influence of humidity or light. Provision of this coating is not essential for performing the primary function of a pressure vessel, namely safe containment of a substance under pressure. The coating, if provided for, can be formed from an elastomer or it can comprise a rigid she.ll of metal or of a thermplastic or thermo-setting material. Preferably, the coating is made of synthetic rubber.
A pressure vessel according to the invention can be used in particular for containing or transporting substances under pressure, such as propane, butane, CNG (compressed natural
gas), air, water and cryogen substances such as liquid nitrogen or liquid oxygen. Depending on the substance to be contained or transported, a pressure vessel according to the invention can be manufactured for a working pressure of 0-5 bar (for example for hot water in an expansion vessel), 0-10 bar (for example for liquid oxygen or liquid nitrogen or for propane gas or butane gas or a mixture thereof in gas flasks intended for use in households and at ambient temperatures), 0-35 bar (for example for propane gas or butane gas at elevated temperatures), 0-100 bar (for example for LPG in .fuel tanks intended for use in motor vehicles), 0-300 bar (for example for CNG or compressed air), and 0-600 bar for cryogenic gas systems in space technology applications. The invention described above has the impact of a breakthrough in the field of winding technology, in particular by overcoming the technical prejudice that use of a matrix material such as a resin is essential for fibre-reinforced pressure vessels. The invention is therefore considered to have a broad scope and not to be limited to only the above-described embodiments.
Claims (22)
1. Fibre-reinforced pressure vessel (1, 6) comprising a rigid gas- or fluid-tight body (2, 7, 13, 19) overwound with fibre filaments (3, 10, 11, 18), whereby at least a number of fibre fila- ments (3, 10, 11, 18) can move freely with respect to one another and the fibre filaments (3,
10, 11, 18) are wound such that when the pressure vessel .is under internal pressure, the fibre filaments (3, 10, 11, 18) are loaded exactly in their longitudinal direction.
2. Fibre-reinforced pressure vessel (1, 6) according to claim 1, whereby all wound fibre .fila- ments (3, 10, 11, 18) can move freely with respect to one another.
3. Fibre-reinforced pressure vessel according to claim 1 or claim 2, whereby the pressure vessel (1) has an .isotensoid shape.
4. Fibre-reinforced pressure vessel according to claim 1 or claim 2, whereby the pressure vessel (6) has a cylindrical shape.
5. Fibre-reinforced pressure vessel according to any preceding claim, whereby the pressure vessel (1, 6) is provided with a coating (20).
6. Fibre-reinforced pressure vessel according to claim 5, whereby the coating (20) comprises synthetic rubber.
7. Fibre-reinforced pressure vessel according to any of claims 1-6, whereby the rigid body (2, 7, 13, 19) is made of high-density polyethene (HDPE) and the fibre filaments (3, 10, 11, 18) are carbon fibres.
8. Fibre-reinforced pressure vessel according to any of claims 1-6, whereby the rigid body (2, 7, 13, 19) is made of high-density polyethene (HDPE) and the fibre filaments (3, 10, 11, 18) are glass fibres.
9. Fibre-reinforced pressure vessel according to any of claims 1-8, whereby the pressure vessel (1, 6) can withstand a working pressure in the range of 0-5 bar.
10. Fibre-reinforced pressure vessel according to any of claims 1-8, whereby the pressure vessel (1, 6) can withstand a working pressure in the range of 0-10 bar.
11. Fibre-reinforced pressure vessel according to any of claims 1-8, whereby the pressure vessel (1, 6) can withstand a working pressure in the range of 0-35 bar.
12. Fibre-reinforced pressure vessel according to any of claims 1-8, whereby the pressure vessel (1, 6) can withstand a working pressure in the range of 0-100 bar.
13. Fibre-reinforced pressure vessel according to any of claims 1-8, whereby the pressure vessel (1, 6) can withstand a working pressure in the range of 0-300 bar.
14. Fibre-reinforced pressure vessel according to any of cla.ims 1-8, whereby the pressure vessel (1, 6) can withstand a working pressure in the range of 0-600 bar.
15. Fibre-reinforced pressure vessel according to any of claims 9-11, suitable for use as a gas flask for propane or butane or a mixture thereof for household uses.
16. Fibre-reinforced pressure vessel according to claim 12 or claim 13, suitable as a fuel tank, in particular for LPG, for use in motor vehicles.
17. Fibre-reinforced pressure vessel according to claim 13 or claim 14, suitable as a fuel tank for CNG or compressed air.
18. Fibre-reinforced pressure vessel according to claim 14 suitable for use as a cryogenic gas system in space technology applications.
19. Fibre-reinforced pressure vessel according to any preceding claim, whereby the pressure vessel (1, 6) is provided with an appendage, for example a closure member or a pressure valve.
20. Method of manufacturing a fibre-reinforced pressure vessel comprising a rigid gas- or fluid-tight body overwound with fibre filaments, whereby the method comprises the steps of: a) providing a rigid gas- or fluid-tight body, fibre filaments and a winding apparatus; b) overwinding the rigid body such that at least a number of fibre filaments can move freely with respect to one another and the fibre filaments are wound such that when the pressure vessel is under .internal pressure vessel the fibre filaments are loaded exactly in the.ir longitudinal direction;
whereby no matrix material (for example, resin) is provided such that the fibre filaments would be incorporated in a matrix for that section of the pressure ves- sel in which the fibre filaments can move freely with respect to one another.
21.Method of manufacturing according to cla.im 20, whereby no matrix material at all is provided.
22.Mould for use in manufacturing a fibre-re.inforced pressure vessel according to claim 20 or claim 21.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL1014290 | 2000-02-04 | ||
| NL1014290A NL1014290C2 (en) | 2000-02-04 | 2000-02-04 | Fiber-reinforced pressure vessel and method for making a fiber-reinforced pressure vessel. |
| PCT/NL2001/000075 WO2001057429A1 (en) | 2000-02-04 | 2001-02-01 | Fibre-reinforced pressure vessel and method of manufacturing fibre-reinforced pressure vessel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2001234259A1 true AU2001234259A1 (en) | 2001-10-25 |
| AU2001234259B2 AU2001234259B2 (en) | 2007-05-31 |
Family
ID=19770750
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2001234259A Ceased AU2001234259B2 (en) | 2000-02-04 | 2001-02-01 | Fibre-reinforced pressure vessel and method of manufacturing fibre-reinforced pressure vessel |
| AU3425901A Pending AU3425901A (en) | 2000-02-04 | 2001-02-01 | Fibre-reinforced pressure vessel and method of manufacturing fibre-reinforced pressure vessel |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU3425901A Pending AU3425901A (en) | 2000-02-04 | 2001-02-01 | Fibre-reinforced pressure vessel and method of manufacturing fibre-reinforced pressure vessel |
Country Status (20)
| Country | Link |
|---|---|
| US (2) | US7086553B2 (en) |
| EP (1) | EP1257766B8 (en) |
| JP (2) | JP5426806B2 (en) |
| KR (1) | KR100738723B1 (en) |
| CN (1) | CN1252411C (en) |
| AT (1) | ATE360175T1 (en) |
| AU (2) | AU2001234259B2 (en) |
| BR (1) | BR0108070B1 (en) |
| CA (1) | CA2399218C (en) |
| CY (1) | CY1106736T1 (en) |
| CZ (1) | CZ303003B6 (en) |
| DE (1) | DE60127940T2 (en) |
| DK (1) | DK1257766T3 (en) |
| ES (1) | ES2286100T3 (en) |
| MX (1) | MXPA02007507A (en) |
| NL (1) | NL1014290C2 (en) |
| NO (1) | NO334553B1 (en) |
| PL (1) | PL197921B1 (en) |
| PT (1) | PT1257766E (en) |
| WO (1) | WO2001057429A1 (en) |
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2001
- 2001-02-01 DE DE60127940T patent/DE60127940T2/en not_active Expired - Lifetime
- 2001-02-01 AT AT01906432T patent/ATE360175T1/en active
- 2001-02-01 AU AU2001234259A patent/AU2001234259B2/en not_active Ceased
- 2001-02-01 BR BRPI0108070-9A patent/BR0108070B1/en not_active IP Right Cessation
- 2001-02-01 CN CNB018071473A patent/CN1252411C/en not_active Expired - Fee Related
- 2001-02-01 MX MXPA02007507A patent/MXPA02007507A/en active IP Right Grant
- 2001-02-01 AU AU3425901A patent/AU3425901A/en active Pending
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- 2001-02-01 EP EP01906432A patent/EP1257766B8/en not_active Expired - Lifetime
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- 2001-02-01 WO PCT/NL2001/000075 patent/WO2001057429A1/en active IP Right Grant
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- 2001-02-01 CZ CZ20022669A patent/CZ303003B6/en not_active IP Right Cessation
- 2001-02-01 PT PT01906432T patent/PT1257766E/en unknown
- 2001-02-01 ES ES01906432T patent/ES2286100T3/en not_active Expired - Lifetime
- 2001-02-01 KR KR1020027010051A patent/KR100738723B1/en active IP Right Grant
- 2001-02-01 PL PL357208A patent/PL197921B1/en unknown
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