WO1990001649A1 - Connection to a pressure vessel of composite material - Google Patents
Connection to a pressure vessel of composite material Download PDFInfo
- Publication number
- WO1990001649A1 WO1990001649A1 PCT/SE1989/000340 SE8900340W WO9001649A1 WO 1990001649 A1 WO1990001649 A1 WO 1990001649A1 SE 8900340 W SE8900340 W SE 8900340W WO 9001649 A1 WO9001649 A1 WO 9001649A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- connection
- bore
- end part
- liner
- seat
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
- F16L58/188—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for branching pipes; for joining pipes to walls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/08—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe
- F16L41/10—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe the extremity of the pipe being screwed into the wall
Definitions
- the present invention relates to a connection to a pressure vessel of composite material, built of fibre material wound around a body part of thermoplast, a so-called liner, comprising an end part about which the fibre material is so provided, that the end part is embedded in and fixed by fibre material, the end part being provided with a substantially rotary-symmetrical axial internal bore.
- the composite material can have many different compositions. The most common is a matrix of epoxy plastic reinforced with glass fibres, but other plastics are also used, such as unsatu- rated polyester plastics.
- the fibres can be of various kinds, such as carbon fibres or aramide fibres.
- the thermoplast in the liner can be polyethylene, polypropylene or other appropriate plastic. It is chosen with regard to special requirements on e.g. chemical resistibility.
- Pressure vessels of composite material are becoming increasingly useful in various fields, particularly for heavier vehicles of various kinds.
- pressure vessels were manufactured by winding fibre material around a body part of aluminium, which thus formed the internal part, i.e. the liner, of the finished pressure vessel.
- Such a liner can be manufactured with a connect ⁇ ing part formed as a part of the liner with relatively thick material, which thereby admits an arrangement of a gas tight connection, e.g. by screwing on a connection tube.
- Aluminium has however certain drawbacks, e.g. in that it is unnecessary heavy and expensive. In addition, its resistance to fatigue is limited, which means that flaws can appear in a liner of the afore ⁇ mentioned kind due to the strain on the liner.
- Thermoplast has therefore come to be used as material in liners for pressure vessels of composite material.
- it has proved to be a diffi ⁇ cult problem how to achieve a gas tight passage between the liner and the connection to the pressure vessel.
- the object of the present invention is to provide a connection of the kind mentioned in the introduction that is simple and reliable.
- such a connection is characterized primarily in that the liner extends axially into said bore, connecting onto its surface, the liner ending with a rotatary- symmetrical first seat across the axial extension of the bore, the end part being provided with means to fix axially a connec ⁇ tion tube provided with a rotary-symmetrical second seat across its axial extension relative to the end parts, so that said seats, preferably with a relatively elastic packing between them, seal toward each other.
- said fixing means con ⁇ sist of interacting threads arranged partly in said bore and partly on the exterior surface of the connection tube.
- the seats can have different shapes.
- the first seat can e.g. be plane, while the other seat is provided with a recessed groove, in which an elastic O-ring is placed.
- the invention is illustrated by the accompanying figure, which shows a longitudinal section through a portion of a pressure vessel of composite material with a liner of thermoplast and a connection according to the invention.
- a liner of polypropylene is designated by 1
- the composite material wound on it i.e. glass fibre in a matrix of epoxy plastic
- An end part 3 externally provided with projecting parts in the form of both right-handed and left-handed threads 4 is embedded in the composite material.
- the end part 3 is formed with an internal axial bore 5, which is threaded with threads 6.
- the liner 1 extends with one part 7 somewhat into the bore 5, connecting with the threads of the end part 6 in its bore 5.
- the liner ends with a plane surface 8 which constitutes a first seat.
- connection tube 9 provided with an external thread 10 is screwed on to the bore 5, the threads 6 interacting with the threads 10.
- the con ⁇ nection tube ends with a second seat 11 across its axial ex ⁇ tension.
- This seat 11 is formed with a recessed groove 12, in which a relatively elastic O-ring 13 is placed.
- the connection tube 9 is screwed on so much as to provide a secure seal between said seats 8 and 11.
- a manufacturing-technical advantage with the connection according to the invention is that the first seat can easily be adjusted to a plane form, or other desired form, across the bore 5 after the fibre material has been wound on the body part.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
A connection to a pressure vessel of composite material wound about a body part (1) a so-called liner of thermoplast with an end part (3) provided with an axial internal bore (5). The connection is characterized particularly in that the liner (1) extends somewhat into the bore (5) and ends with a first seat (8) across the bore (5) and in that a connection tube (9) provided with a second seat (11) is fixed relative to the end part (3) so that said seats (8, 11) seal towards each other, preferably with a packing between them (13).
Description
CONNECTION TO A PRESSURE VESSEL OF COMPOSITE MATERIAL
The present invention relates to a connection to a pressure vessel of composite material, built of fibre material wound around a body part of thermoplast, a so-called liner, comprising an end part about which the fibre material is so provided, that the end part is embedded in and fixed by fibre material, the end part being provided with a substantially rotary-symmetrical axial internal bore.
The composite material can have many different compositions. The most common is a matrix of epoxy plastic reinforced with glass fibres, but other plastics are also used, such as unsatu- rated polyester plastics. The fibres can be of various kinds, such as carbon fibres or aramide fibres. The thermoplast in the liner can be polyethylene, polypropylene or other appropriate plastic. It is chosen with regard to special requirements on e.g. chemical resistibility.
Pressure vessels of composite material are becoming increasingly useful in various fields, particularly for heavier vehicles of various kinds. Originally such pressure vessels were manufactured by winding fibre material around a body part of aluminium, which thus formed the internal part, i.e. the liner, of the finished pressure vessel. Such a liner can be manufactured with a connect¬ ing part formed as a part of the liner with relatively thick material, which thereby admits an arrangement of a gas tight connection, e.g. by screwing on a connection tube. Aluminium has however certain drawbacks, e.g. in that it is unnecessary heavy and expensive. In addition, its resistance to fatigue is limited, which means that flaws can appear in a liner of the afore¬ mentioned kind due to the strain on the liner. Thermoplast has therefore come to be used as material in liners for pressure vessels of composite material. Here, it has proved to be a diffi¬ cult problem how to achieve a gas tight passage between the liner and the connection to the pressure vessel.
The object of the present invention is to provide a connection of the kind mentioned in the introduction that is simple and reliable. According to the invention such a connection is characterized primarily in that the liner extends axially into said bore, connecting onto its surface, the liner ending with a rotatary- symmetrical first seat across the axial extension of the bore, the end part being provided with means to fix axially a connec¬ tion tube provided with a rotary-symmetrical second seat across its axial extension relative to the end parts, so that said seats, preferably with a relatively elastic packing between them, seal toward each other.
In a preferred embodiment of the invention said fixing means con¬ sist of interacting threads arranged partly in said bore and partly on the exterior surface of the connection tube. The seats can have different shapes. The first seat can e.g. be plane, while the other seat is provided with a recessed groove, in which an elastic O-ring is placed.
The invention is illustrated by the accompanying figure, which shows a longitudinal section through a portion of a pressure vessel of composite material with a liner of thermoplast and a connection according to the invention. A liner of polypropylene is designated by 1, and the composite material wound on it, i.e. glass fibre in a matrix of epoxy plastic, is designated by 2. An end part 3 externally provided with projecting parts in the form of both right-handed and left-handed threads 4 is embedded in the composite material. The end part 3 is formed with an internal axial bore 5, which is threaded with threads 6. The liner 1 extends with one part 7 somewhat into the bore 5, connecting with the threads of the end part 6 in its bore 5. The liner ends with a plane surface 8 which constitutes a first seat. A connection tube 9 provided with an external thread 10 is screwed on to the bore 5, the threads 6 interacting with the threads 10. The con¬ nection tube ends with a second seat 11 across its axial ex¬ tension. This seat 11 is formed with a recessed groove 12, in
which a relatively elastic O-ring 13 is placed. The connection tube 9 is screwed on so much as to provide a secure seal between said seats 8 and 11. A manufacturing-technical advantage with the connection according to the invention is that the first seat can easily be adjusted to a plane form, or other desired form, across the bore 5 after the fibre material has been wound on the body part.
Claims
1. A connection to a pressure vessel of composite material, built of fibre material (2) wound around a body part (1) of thermo¬ plast, comprising an end part (3) about which the fibre material (2) is so provided, that the end part (3) is embedded in and fixed by the fibre material, the end part being provided with a substantially rotary-symmetrical axial internal bore (5), c h a r a c t e r i z e d in that the liner (1) extends axially into said bore (5), connecting onto its surface, the liner ending with a rotary-symmetrical first seat (8) across the axial extension of the bore, the end part (3) being provided with means (6, 8) to axially fix a connection tube (9), provided with a rotary-symmetrical second seat (11) across its axial extension relative to the end part, so that said seats, preferably with a relatively elastic packing between them, seal toward each other.
2. A connection according to claim 1, c h a r a c t e r i z e d in that said means for axial fixing consists of interacting threads (6, 8), provided partly in said bore (5) and partly on the external surface of the connection tube (9).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8802893A SE459202B (en) | 1988-08-15 | 1988-08-15 | CONNECTION TO A PRESSURE CONDITION OF COMPOSITION MATERIAL |
SE8802893-1 | 1988-08-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990001649A1 true WO1990001649A1 (en) | 1990-02-22 |
Family
ID=20373073
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1989/000340 WO1990001649A1 (en) | 1988-08-15 | 1989-06-16 | Connection to a pressure vessel of composite material |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0428557A1 (en) |
SE (1) | SE459202B (en) |
WO (1) | WO1990001649A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006006902A1 (en) * | 2006-02-09 | 2007-08-16 | Gräfenthaler Kunststofftechnik GmbH | Plastic pressure vessel and process for its manufacture |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4614279A (en) * | 1984-12-13 | 1986-09-30 | Essef Industries, Inc. | Side tap opening for a filament-wound tank |
-
1988
- 1988-08-15 SE SE8802893A patent/SE459202B/en not_active IP Right Cessation
-
1989
- 1989-06-16 WO PCT/SE1989/000340 patent/WO1990001649A1/en not_active Application Discontinuation
- 1989-06-16 EP EP19890908556 patent/EP0428557A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4614279A (en) * | 1984-12-13 | 1986-09-30 | Essef Industries, Inc. | Side tap opening for a filament-wound tank |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006006902A1 (en) * | 2006-02-09 | 2007-08-16 | Gräfenthaler Kunststofftechnik GmbH | Plastic pressure vessel and process for its manufacture |
DE102006006902B4 (en) * | 2006-02-09 | 2008-02-21 | Gräfenthaler Kunststofftechnik GmbH | Plastic pressure vessel and process for its manufacture |
Also Published As
Publication number | Publication date |
---|---|
EP0428557A1 (en) | 1991-05-29 |
SE8802893D0 (en) | 1988-08-15 |
SE459202B (en) | 1989-06-12 |
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