GB2052665A - A Device in a Bellows Joint Between Two Pipes - Google Patents

A Device in a Bellows Joint Between Two Pipes Download PDF

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Publication number
GB2052665A
GB2052665A GB8019197A GB8019197A GB2052665A GB 2052665 A GB2052665 A GB 2052665A GB 8019197 A GB8019197 A GB 8019197A GB 8019197 A GB8019197 A GB 8019197A GB 2052665 A GB2052665 A GB 2052665A
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GB
United Kingdom
Prior art keywords
bellows
insulation sleeve
insulation
pipes
frame pieces
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.)
Granted
Application number
GB8019197A
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GB2052665B (en
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Partek Oy AB
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Partek Oy AB
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Filing date
Publication date
Application filed by Partek Oy AB filed Critical Partek Oy AB
Publication of GB2052665A publication Critical patent/GB2052665A/en
Application granted granted Critical
Publication of GB2052665B publication Critical patent/GB2052665B/en
Expired legal-status Critical Current

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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
    • F16L59/00—Thermal insulation in general
    • F16L59/14—Arrangements for the insulation of pipes or pipe systems
    • F16L59/16—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like
    • F16L59/21—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like adapted for expansion-compensation devices

Abstract

A bellow joint for use between two pipes 1, 2 carrying hot gases comprises a resilient bellows 12 connected by means of clamps 13, 14 to frame pieces 6, 7 connected to the ends of the pipes; and a resiliently deformable insulation sleeve 15 connected to the frame pieces radially inwardly of the bellows, to prevent the hot gases from coming into contact with the bellows 12. <IMAGE>

Description

SPECIFICATION A Device in a Bellows Joint between Two Pipes The present invention relates to a device in a bellows joint between two pipes, comprising a resilient bellows connected by means of clamps to frame pieces connected to the ends of the pipes.
Such bellows joints are used for compensating for thermal expansion in joints of flue-gas and hot-air ducts in the process industry. In order to protect the bellows from hot gases, which could damage it and shorten its life, insulation fitted inside the bellows, as seen in the radial direction, is used in currently known bellows joints, the insulation being of glass-wool, rockwool or ceramic wool which is packed inside the bellows joint.
Since, however, the bellows joint will 'live' in the duct system owing to thermal expansion and contraction and since the insulation wools lose their resilience at high temperatures, gaps or conduits are formed between the insulation wool and the frame of the bellows joint, and via these gaps and conduits hot gases come into contact with the bellows, with the above-mentioned consequences. Vibration also shakes down the insulation, producing gaps.
The object of the present invention is, therefore, to provide a bellows joint which does not have the above-mentioned disadvantages and in which the bellows is effectively insulated against the hot gases flowing in the ducts.
The bellows joint according to the invention is primarily characterized in that a resiliently deformable insulation sleeve, which prevents the hot gases from coming into contact with the bellows, has been connected to the frame pieces inside the bellows, as seen in the radial direction.
According to an advantageous embodiment of the invention, the insulation sleeve is attached to the frame pieces by means of the same clamps as the bellows are. According to the invention, the insulation sleeve preferably consists of a mat of rockwool, glasswool or ceramic wool fitted between two cloths, the wool mat having been connected to the cloths by parallel stitching at desired intervals and the insulation sleeve having between folded into a concertina shape along these stitchings.
In the bellows joint according to the invention, the insulation sleeve 'lives' in the same manner as the bellows and thereby completely prevents heat from reaching the bellows, even if the thermal expansion movements are great. Furthermore, the insulation sleeve according to the invention is not sensitive to vibration and retains its insulating capacity even under strong vibration.
The invention is described below in greater detail with reference to the accompanying drawing, which depicts a pipe duct equipped with a bellows joint according to the invention, partially in longitudinal section.
In the drawing, reference numerals 1 and 2 indicate the pipes of the pipe duct 2. The pipe 1 on the upstream side has been equipped with a bypass plate 3, known per se. A circular flange 4, 5 has been welded to each pipe 1, 2, near its end.
Furthermore, a circular frame piece 6,7 has been slipped over the end of each pipe 1, 2, the cross section of the frame piece being U-shaped in such a manner that a flange 8, 9 parallel to the middle section of the U protrudes from that branch of the U which is in contact with the pipe. These flanges have been connected with bolts to the respective circular flanges 4,5. A bellows 12 made of a gastight cloth, for example asbestos cloth, has been fitted over the flanges 10, 1 1 of the circumference of the frame pieces 6,7, and connected to the flanges by means of clamps 13, 14.
In previously known bellows joints, the space between the bypass plate 3, the frame pieces 6, 7 and the bellows 12 has been packed with an insulation material consisting of rock wool, glasswool or ceramic wool. However, such insulation material is shaken down by vibration, whereby gaps may be formed in the insulation material layer. Furthermore, if thermal expansion occurs in one direction, the insulation material layer is compressed, and when expansion takes place in the opposite direction, the layer no longer returns to its original shape but leaves gaps at the edges, and via these gaps the hot gases come into contact with the bellows 12.
In the bellows joint according to the present invention, this disadvantage has been eliminated by attaching the insulation sleeve 15 inside the bellows 12, as seen in the radial direction, to the flanges 10, 11 of the frame pieces 6, 7 by means of the same clamps 13, 14 as are used for attaching the bellows. The insulation sleeve 15 preferably consists of a layer 18 of rockwool, glasswool or ceramic wool fitted between two textile layers 16, 17, these layers having been interconnected by stitchings at desired intervals, indicated by the dotted lines 19 in the drawing.
The insulation sleeve has been folded to the shape of a concertina along these stitchings.
It is evident that the insulation sleeve 15 need not necessarily have the shape of a concertina, but it suffices for the purposes of the invention that it is capable of resiliently changing its shape so as to adjust to the thermal expansion movements at least to the same degree as the bellows 12.
Claims
1. A bellows joint for use between two pipes carrying hot gases, comprising: a resilient bellows connected by means of clamps to frame pieces connected to the ends of the pipes; and a resiliently deformable insulation sleeve connected to the frame pieces radially inwardly of the bellows, to prevent the hot gases from coming into contact with the bellows.
2. A bellows joint according to claim 1, wherein the insulation sleeve has been connected
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A Device in a Bellows Joint between Two Pipes The present invention relates to a device in a bellows joint between two pipes, comprising a resilient bellows connected by means of clamps to frame pieces connected to the ends of the pipes. Such bellows joints are used for compensating for thermal expansion in joints of flue-gas and hot-air ducts in the process industry. In order to protect the bellows from hot gases, which could damage it and shorten its life, insulation fitted inside the bellows, as seen in the radial direction, is used in currently known bellows joints, the insulation being of glass-wool, rockwool or ceramic wool which is packed inside the bellows joint. Since, however, the bellows joint will 'live' in the duct system owing to thermal expansion and contraction and since the insulation wools lose their resilience at high temperatures, gaps or conduits are formed between the insulation wool and the frame of the bellows joint, and via these gaps and conduits hot gases come into contact with the bellows, with the above-mentioned consequences. Vibration also shakes down the insulation, producing gaps. The object of the present invention is, therefore, to provide a bellows joint which does not have the above-mentioned disadvantages and in which the bellows is effectively insulated against the hot gases flowing in the ducts. The bellows joint according to the invention is primarily characterized in that a resiliently deformable insulation sleeve, which prevents the hot gases from coming into contact with the bellows, has been connected to the frame pieces inside the bellows, as seen in the radial direction. According to an advantageous embodiment of the invention, the insulation sleeve is attached to the frame pieces by means of the same clamps as the bellows are. According to the invention, the insulation sleeve preferably consists of a mat of rockwool, glasswool or ceramic wool fitted between two cloths, the wool mat having been connected to the cloths by parallel stitching at desired intervals and the insulation sleeve having between folded into a concertina shape along these stitchings. In the bellows joint according to the invention, the insulation sleeve 'lives' in the same manner as the bellows and thereby completely prevents heat from reaching the bellows, even if the thermal expansion movements are great. Furthermore, the insulation sleeve according to the invention is not sensitive to vibration and retains its insulating capacity even under strong vibration. The invention is described below in greater detail with reference to the accompanying drawing, which depicts a pipe duct equipped with a bellows joint according to the invention, partially in longitudinal section. In the drawing, reference numerals 1 and 2 indicate the pipes of the pipe duct 2. The pipe 1 on the upstream side has been equipped with a bypass plate 3, known per se. A circular flange 4, 5 has been welded to each pipe 1, 2, near its end. Furthermore, a circular frame piece 6,7 has been slipped over the end of each pipe 1, 2, the cross section of the frame piece being U-shaped in such a manner that a flange 8, 9 parallel to the middle section of the U protrudes from that branch of the U which is in contact with the pipe. These flanges have been connected with bolts to the respective circular flanges 4,5. A bellows 12 made of a gastight cloth, for example asbestos cloth, has been fitted over the flanges 10, 1 1 of the circumference of the frame pieces 6,7, and connected to the flanges by means of clamps 13, 14. In previously known bellows joints, the space between the bypass plate 3, the frame pieces 6, 7 and the bellows 12 has been packed with an insulation material consisting of rock wool, glasswool or ceramic wool. However, such insulation material is shaken down by vibration, whereby gaps may be formed in the insulation material layer. Furthermore, if thermal expansion occurs in one direction, the insulation material layer is compressed, and when expansion takes place in the opposite direction, the layer no longer returns to its original shape but leaves gaps at the edges, and via these gaps the hot gases come into contact with the bellows 12. In the bellows joint according to the present invention, this disadvantage has been eliminated by attaching the insulation sleeve 15 inside the bellows 12, as seen in the radial direction, to the flanges 10, 11 of the frame pieces 6, 7 by means of the same clamps 13, 14 as are used for attaching the bellows. The insulation sleeve 15 preferably consists of a layer 18 of rockwool, glasswool or ceramic wool fitted between two textile layers 16, 17, these layers having been interconnected by stitchings at desired intervals, indicated by the dotted lines 19 in the drawing. The insulation sleeve has been folded to the shape of a concertina along these stitchings. It is evident that the insulation sleeve 15 need not necessarily have the shape of a concertina, but it suffices for the purposes of the invention that it is capable of resiliently changing its shape so as to adjust to the thermal expansion movements at least to the same degree as the bellows 12. Claims
1. A bellows joint for use between two pipes carrying hot gases, comprising: a resilient bellows connected by means of clamps to frame pieces connected to the ends of the pipes; and a resiliently deformable insulation sleeve connected to the frame pieces radially inwardly of the bellows, to prevent the hot gases from coming into contact with the bellows.
2. A bellows joint according to claim 1, wherein the insulation sleeve has been connected by means of the same clamps as the bellows have.
3. A bellows joint according to claim 1 or 2, wherein the insulation sleeve consists of a mat of rockwool, glasswool or ceramic wool fitted between two cloths, the mat having been connected to the cloths by parallel stitchings at desired intervals, and the insulation sleeve having been folded to the shape of a concertina along the stitchings.
4. A bellows joint for use between two pipes, substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawings.
GB8019197A 1979-06-14 1980-06-12 Device in a bellows joint between two pipes Expired GB2052665B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI791901A FI64849C (en) 1979-06-14 1979-06-14 BAELGFOERBINDNINGSKONSTRUKTION

Publications (2)

Publication Number Publication Date
GB2052665A true GB2052665A (en) 1981-01-28
GB2052665B GB2052665B (en) 1983-08-17

Family

ID=8512726

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8019197A Expired GB2052665B (en) 1979-06-14 1980-06-12 Device in a bellows joint between two pipes

Country Status (6)

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DE (1) DE3021681A1 (en)
DK (1) DK150119C (en)
FI (1) FI64849C (en)
GB (1) GB2052665B (en)
NO (1) NO155258C (en)
SE (1) SE443635B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2518700A1 (en) * 1981-12-17 1983-06-24 Didier Werke Ag COMPENSATING DEVICE FOR HOT WIND OR HOT GAS PIPES
EP0379525A1 (en) * 1987-09-15 1990-08-01 Bachmann Ind Inc Fabric expansion joints for exhaust systems of gas turbines.
EP0445352A1 (en) * 1990-03-09 1991-09-11 IWK Regler und Kompensatoren GmbH Flexible pipe component with heat insulation
US5074697A (en) * 1988-12-14 1991-12-24 Societe Europeenne De Propulsion Releasable connector for interconnecting two parts subjected to high stresses
AT397549B (en) * 1992-07-23 1994-04-25 Austrian Energy & Environment Flange joint
US5366255A (en) * 1992-03-02 1994-11-22 Foster Wheeler Energy Corporation Expansion seal assembly
US5704657A (en) * 1994-12-12 1998-01-06 Seibu Polymer Kasei Kabushiki Kaisha Flexible joint for a culvert
US5794987A (en) * 1994-12-12 1998-08-18 Seibu Polymer Kasei Kabushiki Kaisha Flexible joint for a culvert
FR2906343A1 (en) * 2006-09-21 2008-03-28 S F Z Soc Par Actions Simplifi Expansion bellows for installation e.g. oil and gas installations, has inner and outer radial walls provided with respect to main axis of bellows, and thermal insulation layers placed and sandwiched between walls

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9407060U1 (en) * 1994-04-28 1994-09-22 Gfg Ges Fuer Gewebekompensator Heat and dust protection pack for fabric expansion joints

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2518700A1 (en) * 1981-12-17 1983-06-24 Didier Werke Ag COMPENSATING DEVICE FOR HOT WIND OR HOT GAS PIPES
EP0379525A1 (en) * 1987-09-15 1990-08-01 Bachmann Ind Inc Fabric expansion joints for exhaust systems of gas turbines.
EP0379525A4 (en) * 1987-09-15 1991-03-20 Bachmann Industries, Inc. Fabric expansion joints for exhaust systems of gas turbines
US5074697A (en) * 1988-12-14 1991-12-24 Societe Europeenne De Propulsion Releasable connector for interconnecting two parts subjected to high stresses
EP0445352A1 (en) * 1990-03-09 1991-09-11 IWK Regler und Kompensatoren GmbH Flexible pipe component with heat insulation
WO1991014126A1 (en) * 1990-03-09 1991-09-19 Iwk Regler Und Kompensatoren Gmbh Flexible pipeline element with thermal insulation
US5366255A (en) * 1992-03-02 1994-11-22 Foster Wheeler Energy Corporation Expansion seal assembly
AT397549B (en) * 1992-07-23 1994-04-25 Austrian Energy & Environment Flange joint
US5704657A (en) * 1994-12-12 1998-01-06 Seibu Polymer Kasei Kabushiki Kaisha Flexible joint for a culvert
US5794987A (en) * 1994-12-12 1998-08-18 Seibu Polymer Kasei Kabushiki Kaisha Flexible joint for a culvert
US5879032A (en) * 1994-12-12 1999-03-09 Seibu Polymer Kasei Kabushiki Kaisha Flexible joint for a culvert
FR2906343A1 (en) * 2006-09-21 2008-03-28 S F Z Soc Par Actions Simplifi Expansion bellows for installation e.g. oil and gas installations, has inner and outer radial walls provided with respect to main axis of bellows, and thermal insulation layers placed and sandwiched between walls

Also Published As

Publication number Publication date
DK150119B (en) 1986-12-08
SE443635B (en) 1986-03-03
NO155258B (en) 1986-11-24
GB2052665B (en) 1983-08-17
NO801748L (en) 1980-12-15
SE8004401L (en) 1980-12-15
DE3021681A1 (en) 1980-12-18
FI64849B (en) 1983-09-30
NO155258C (en) 1987-03-04
DK150119C (en) 1987-11-09
FI64849C (en) 1984-01-10
FI791901A (en) 1980-12-15
DK246780A (en) 1980-12-15

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930612