EP1112787A2 - Gas-tight flexible welded pipe, apparatus for making same and manufacturing process - Google Patents
Gas-tight flexible welded pipe, apparatus for making same and manufacturing process Download PDFInfo
- Publication number
- EP1112787A2 EP1112787A2 EP00125604A EP00125604A EP1112787A2 EP 1112787 A2 EP1112787 A2 EP 1112787A2 EP 00125604 A EP00125604 A EP 00125604A EP 00125604 A EP00125604 A EP 00125604A EP 1112787 A2 EP1112787 A2 EP 1112787A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- spiral
- corrugated
- pipe
- welding
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/12—Making tubes or metal hoses with helically arranged seams
- B21C37/122—Making tubes or metal hoses with helically arranged seams with welded or soldered seams
Definitions
- the invention refers to pipes, particularly for flue gases.
- corrugated tubes or pipes for emission of flue gases consisting of a completely corrugated strip with corrugations or undulations having a longitudinal axis, said strip being spirally wound, contacting edges of strip portions being coupled to each other by seaming.
- the object of the present invention is to obtain corrugated pipes that have an excellent gas-tight seal, but that can nevertheless be produced at an economically advantageous cost.
- the new pipe is composed of a metal strip with an at least partially corrugated profile, said strip being wound in a spiral with overlapping edges, the overlapping edges being welded.
- the metal strip preferably has a profile that comprises a corrugated portion with undulations or corrugations having their axis longitudinal to the strip and an adjacent flat or smooth portion, and the tube is assembled so that the corrugated portion of a length of strip is outwardly overlapping with respect to the smooth portion of an adjacent length of the strip.
- the overlapping portions of strip are welded to each other by any per se known welding method.
- the apparatus essentially comprises feeding means to feed to a mandrel an at least partially corrugated metal strip having corrugations lying longitudinally; a mandrel rotatable around an axis substantially transversal to a feeding direction of the strip, to wind the strip in a spiral, radial pressure wheels or rollers that press the strip on the mandrel.
- a welding device welds the overlapping edges of the spiral strip.
- the invention fulfils the above mentioned objectives, in particular the pipe has good gas-tightness, and does not obstruct the flow of flue gases internally, though being flexible and strong.
- a pipe or tube T shown in Figure 1 is composed of a strip of sheet metal wound in a spiral.
- the sheet metal strip used can be better seen in Figure 2 and is indicated by reference numeral 10.
- sheets 0.08 to 0.20 mm thick are used.
- the strip comprises a portion 11 with longitudinal corrugations or undulations 12 having their axes parallel to each other and lying longitudinally to the strip, and a substantially flat portion 13.
- the strip 10 is wound on itself in a spiral so that the corrugated portion 11 of each strip section is disposed externally to the adjacent flat strip portion 13, as can be seen in Figure 2a.
- FIG. 2a For the sake of clarity in Figure 2a a first strip section or length referenced 10a, a second strip section or length referenced 10b and a third strip section or length referenced 10c are shown.
- the strip section 10a has a flat or smooth portion 13a on which a corrugated portion 11b of strip section or loop 10b is superimposed, or better is externally disposed; a flat portion 13b of the loop or strip section 10b is covered by the corrugated portion 11c of loop or strip section 10c.
- the overlapping edges of the strip loops are welded to one another, along a spiral line, visible as dots in Figure 2a.
- the loops 10a and 10b are welded to one another in position 15ab, the loops 10b, 10c are welded to each other in position 15bc; in this manner the pipe keeps some advantageous characteristics of corrugated tubes, such as flexibility, and yet has an excellent gas-tight seal, and, having the inside practically smooth, does not obstruct the outflow of the gases.
- the apparatus indicated as a whole by reference numeral 20, comprises an unwinding reel 22, which carries a coil 24 of sheet metal strip 26, preferably a sheet of stainless steel. Downstream of the reel, on a structure 27, the apparatus comprises a per se-known corrugating device referenced 28 as a whole, which will not be described here in detail.
- the corrugating device is such as to give the strip 26 a corrugation with undulations having their axis longitudinal to said strip on at least one portion of the width of the strip 26.
- the undulated or corrugated metal strip 30 leaving the corrugator is preferably the strip 10 and travels in the direction of the arrow FN and according to axis b .
- Reference numeral 29 denotes a control panel.
- a winding mandrel is referenced 32 and is rotatable around an axis a substantially perpendicular to the sheet of the drawing in Figure 3.
- the structure 27, as seen in a plan view, is mounted with feed means arranged to feed the strip 30 according to the axis b substantially transversal to the axis a , but with an inclination with respect to a perpendicular to the axis a, so as to generate the spiral.
- an angle ⁇ between the axes a and b is between 90° and 115°, preferably 100°.
- the structure 27 can preferably be mounted so that the arrangement thereof on the horizontal plane can be slightly varied, to vary the inclination of the axis b and the angle of the spiral.
- Reference 31 is a geared motor to effect said variation.
- the mandrel 32 ( Figure 6) is mounted integral with a mandrel-bearing sleeve 34 supported on bearings 36, the outer ring of the bearings is borne by a frame 38 of the apparatus.
- a rotational movement is given to the sleeve 34 by a motor 40, essentially through an output shaft 42 of the motor, pulleys 44, belts 46, and a pulley 48 integral with the mandrel-bearing sleeve.
- Radial pressers or pushers 50 collaborate with the mandrel 32, said pressers preferably being disposed angularly equidistant around the mandrel, in stationary positions, and pressed radially against the mandrel.
- Each presser 50 substantially comprises a pressure wheel 52 idle around a spindle 53, the wheel 52 having a completely or partially corrugated profile indicated by 54.
- the collaboration of the mandrel 32 and the wheels 54 bends the strip 10 winding it on itself in a spiral and making it travel towards the left in Figure 3 (arrow FT), in the form of a pipe with an external corrugation.
- the welding assembly 60 comprises a welding head 62, preferably a per se known high frequency welding head, with variable frequency.
- a contrast means 64 is supported to project inside the pipe as it forms and is supported integral to a tube-shaped arm 66 resting on bearings 68 inside the sleeve 34, so that the arm or tube 66 can be held still on rotation of the sleeve.
- ducts 70 for inert gas extend, said gas being fed into the welding area or immediately downstream thereof, to keep the product white and not oxidized.
- a per se known brushing assembly Downstream of the welding group, a per se known brushing assembly can be provided to eliminate any oxides that have formed.
- a metal strip preferably a stainless steel strip, is uncoiled from a reel and fed through the corrugating device, where it is corrugated generally on a portion thereof, generally half of its width.
- the partially corrugated metal strip is then wound in a spiral on itself by means of the mandrel and the presser means around said mandrel, so as to superimpose the corrugated portion of each loop or ring of strip on the flat portion of an adjacent loop of strip.
- a weld is then made at the overlapping edges; the weld generally fastens together an extreme edge of the corrugated portion of the strip of a trailing loop on an intermediate edge of the smooth strip portion of a leading loop.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Examining Or Testing Airtightness (AREA)
- Making Paper Articles (AREA)
Abstract
Description
- The invention refers to pipes, particularly for flue gases.
- Known to the art and widely used are corrugated tubes or pipes for emission of flue gases, consisting of a completely corrugated strip with corrugations or undulations having a longitudinal axis, said strip being spirally wound, contacting edges of strip portions being coupled to each other by seaming.
- Although this type of pipe has been widely used up to now, with the coming into force of more restrictive safety standards it will no longer be possible to use such pipes, in that they are not sufficiently gas-tight.
- The object of the present invention is to obtain corrugated pipes that have an excellent gas-tight seal, but that can nevertheless be produced at an economically advantageous cost.
- These objects have been achieved with a pipe as stated in claim 1, a process as stated in
claim 11 and an apparatus as stated inclaim 3. - The new pipe is composed of a metal strip with an at least partially corrugated profile, said strip being wound in a spiral with overlapping edges, the overlapping edges being welded. The metal strip preferably has a profile that comprises a corrugated portion with undulations or corrugations having their axis longitudinal to the strip and an adjacent flat or smooth portion, and the tube is assembled so that the corrugated portion of a length of strip is outwardly overlapping with respect to the smooth portion of an adjacent length of the strip. The overlapping portions of strip are welded to each other by any per se known welding method.
- The apparatus essentially comprises feeding means to feed to a mandrel an at least partially corrugated metal strip having corrugations lying longitudinally; a mandrel rotatable around an axis substantially transversal to a feeding direction of the strip, to wind the strip in a spiral, radial pressure wheels or rollers that press the strip on the mandrel. Just downstream of the mandrel a welding device welds the overlapping edges of the spiral strip.
- The invention fulfils the above mentioned objectives, in particular the pipe has good gas-tightness, and does not obstruct the flow of flue gases internally, though being flexible and strong.
- An embodiment of the invention will be described below purely by way of an exemplary unrestrictive embodiment with reference to the appended figures, in which:
- Figure 1 shows a side view of a length of pipe according to the invention;
- Figure 2 shows, in cross sectional view, a strip of corrugated sheet metal used to form the pipe of the invention;
- Figure 2a is a longitudinal sectional view taken along the pipe, showing a part of a pipe wall, enlarged with respect to Figure 1, to show better the overlapping of the coils of sheet metal of which it is composed;
- Figure 3 is an elevational sectional view taken along plane 3-3 in Figure 5 of an apparatus according to the invention, reduced in scale;
- Figure 4 is a top plan view with respect to Figure 3;
- Figure 5 is a left elevational side view of the apparatus of Figure 3;
- Figure 6 is an enlarged broken-away part-sectional view taken along plane 6-6 in Figure 3.
-
- With reference to the figures, a pipe or tube T shown in Figure 1, in accordance with the invention, is composed of a strip of sheet metal wound in a spiral. The sheet metal strip used can be better seen in Figure 2 and is indicated by
reference numeral 10. Indicatively, sheets 0.08 to 0.20 mm thick are used. The strip comprises aportion 11 with longitudinal corrugations orundulations 12 having their axes parallel to each other and lying longitudinally to the strip, and a substantiallyflat portion 13. Thestrip 10 is wound on itself in a spiral so that thecorrugated portion 11 of each strip section is disposed externally to the adjacentflat strip portion 13, as can be seen in Figure 2a. For the sake of clarity in Figure 2a a first strip section or length referenced 10a, a second strip section or length referenced 10b and a third strip section or length referenced 10c are shown. The strip section 10a has a flat or smooth portion 13a on which acorrugated portion 11b of strip section orloop 10b is superimposed, or better is externally disposed; aflat portion 13b of the loop orstrip section 10b is covered by the corrugated portion 11c of loop or strip section 10c. The overlapping edges of the strip loops are welded to one another, along a spiral line, visible as dots in Figure 2a. In said figure, for example, theloops 10a and 10b are welded to one another in position 15ab, theloops 10b, 10c are welded to each other in position 15bc; in this manner the pipe keeps some advantageous characteristics of corrugated tubes, such as flexibility, and yet has an excellent gas-tight seal, and, having the inside practically smooth, does not obstruct the outflow of the gases. - An apparatus according to the invention will be described with reference to Figures 3 to 6. The apparatus, indicated as a whole by
reference numeral 20, comprises anunwinding reel 22, which carries acoil 24 ofsheet metal strip 26, preferably a sheet of stainless steel. Downstream of the reel, on astructure 27, the apparatus comprises a per se-known corrugating device referenced 28 as a whole, which will not be described here in detail. The corrugating device is such as to give the strip 26 a corrugation with undulations having their axis longitudinal to said strip on at least one portion of the width of thestrip 26. The undulated orcorrugated metal strip 30 leaving the corrugator is preferably thestrip 10 and travels in the direction of the arrow FN and according to axis b.Reference numeral 29 denotes a control panel. - A winding mandrel is referenced 32 and is rotatable around an axis a substantially perpendicular to the sheet of the drawing in Figure 3.
- The
structure 27, as seen in a plan view, is mounted with feed means arranged to feed thestrip 30 according to the axis b substantially transversal to the axis a, but with an inclination with respect to a perpendicular to the axis a, so as to generate the spiral. Generally an angle α between the axes a and b is between 90° and 115°, preferably 100°. Moreover, thestructure 27 can preferably be mounted so that the arrangement thereof on the horizontal plane can be slightly varied, to vary the inclination of the axis b and the angle of the spiral.Reference 31 is a geared motor to effect said variation. - The mandrel 32 (Figure 6) is mounted integral with a mandrel-bearing
sleeve 34 supported onbearings 36, the outer ring of the bearings is borne by aframe 38 of the apparatus. A rotational movement is given to thesleeve 34 by amotor 40, essentially through anoutput shaft 42 of the motor,pulleys 44,belts 46, and apulley 48 integral with the mandrel-bearing sleeve. - Radial pressers or
pushers 50 collaborate with themandrel 32, said pressers preferably being disposed angularly equidistant around the mandrel, in stationary positions, and pressed radially against the mandrel. Eachpresser 50 substantially comprises apressure wheel 52 idle around aspindle 53, thewheel 52 having a completely or partially corrugated profile indicated by 54. The collaboration of themandrel 32 and thewheels 54 bends thestrip 10 winding it on itself in a spiral and making it travel towards the left in Figure 3 (arrow FT), in the form of a pipe with an external corrugation. - Just downstream of the mandrel-presser assembly a welding assembly is disposed, indicated as a whole by 60. The
welding assembly 60 comprises awelding head 62, preferably a per se known high frequency welding head, with variable frequency. A contrast means 64 is supported to project inside the pipe as it forms and is supported integral to a tube-shaped arm 66 resting onbearings 68 inside thesleeve 34, so that the arm ortube 66 can be held still on rotation of the sleeve. Inside thetube 66ducts 70 for inert gas extend, said gas being fed into the welding area or immediately downstream thereof, to keep the product white and not oxidized. - Downstream of the welding group, a per se known brushing assembly can be provided to eliminate any oxides that have formed.
- The process will now be described with reference to the figure.
- A metal strip, preferably a stainless steel strip, is uncoiled from a reel and fed through the corrugating device, where it is corrugated generally on a portion thereof, generally half of its width. The partially corrugated metal strip is then wound in a spiral on itself by means of the mandrel and the presser means around said mandrel, so as to superimpose the corrugated portion of each loop or ring of strip on the flat portion of an adjacent loop of strip. A weld is then made at the overlapping edges; the weld generally fastens together an extreme edge of the corrugated portion of the strip of a trailing loop on an intermediate edge of the smooth strip portion of a leading loop.
Claims (15)
- A pipe for conveying gases characterized in that it is composed of a metal strip wound in a spiral, the metal strip comprising at least one corrugated portion (1), adjacent loops or rings of the spiral being partially overlapped and welded.
- A pipe according to claim 1, in which said strip comprises said corrugated portion having corrugations with their axis longitudinal to the strip, and a flat portion (13) alongside, the corrugated portion of a spiral loop or ring is disposed outside and superimposed on the flat portion of an adjacent loop, and the weld is substantially along a continuous spiral line.
- An apparatus for forming a pipe according to claim 1, characterized in that it comprises:feed means for feeding an at least partially corrugated metal strip (10, 30) having corrugations with their axis longitudinal to the strip,rotating winding means to wind said strip in a spiral with the edges of the spiral partially overlappingwelding means (60) for making a weld on the overlapping edges of the spiral.
- An apparatus according to claim 3, characterized in that the winding means for winding the strip (10) in a spiral to form the pipe comprise mandrel means (32) rotating around an axis (a) which is substantially transversal to a strip feeding direction.
- An apparatus according to claim 4, characterized in that it comprises radial presser means (50), collaborating with the mandrel, and the presser means comprise idler wheels with a profile that is at least partially undulated or corrugated circumferentially.
- An apparatus according to claim 3, characterized in that the welding means comprise a high frequency welding head, with variable frequency.
- An apparatus according to claim 6, characterized in that the welding means comprise contrast means (64) inside the pipe, said contrast means being supported by an arm inside the mandrel but being independent from rotation thereof.
- An apparatus according to claim 7, characterized in that it comprises ducts (70) for feeding inert gas inside the pipe.
- An apparatus according to claim 3, characterized in that it further comprises corrugating means (28) upstream of the winding means, to produce at least partially corrugated strip with longitudinal corrugations starting from a flat strip.
- An apparatus according to claim 9, characterized in that it comprises an unwinding reel (22) for unwinding flat strip, upstream of said corrugating means.
- A process for producing gas-tight pipe starting from an at least partially undulated or corrugated metal strip, characterized in that it comprises the following steps:feeding a corrugated strip with corrugations having their axis longitudinal to the strip on at least part of its width, to a winding meanswinding said strip in a spiral with edges of adjacent spiral loops overlappingwelding said overlapping edges to one another.
- A process according to claim 11 characterized in that it comprises, upstream of said steps, the step of obtaining partially corrugated strip starting from a flat strip, the corrugations lying longitudinally and covering a partial surface in the width of said strip.
- A process according to claim 11, characterized in that said weld is a high frequency weld with variable frequency.
- A process according to claim 11, characterized in that it comprises the operation of feeding inert gas inside the pipe being formed during said welding step.
- A process according to claim 11, characterized in that it comprises a brushing step downstream of the welding step.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI992753 | 1999-12-30 | ||
IT1999MI002753A IT1314350B1 (en) | 1999-12-30 | 1999-12-30 | SMOKE SEALED FLEXIBLE HOSE, PERREALIZE EQUIPMENT AND PRODUCTION PROCESS |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1112787A2 true EP1112787A2 (en) | 2001-07-04 |
EP1112787A3 EP1112787A3 (en) | 2002-07-31 |
EP1112787B1 EP1112787B1 (en) | 2006-02-01 |
Family
ID=11384231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00125604A Expired - Lifetime EP1112787B1 (en) | 1999-12-30 | 2000-11-22 | Apparatus and manufacturing process for making a gas-tight flexible welded pipe |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1112787B1 (en) |
AT (1) | ATE316829T1 (en) |
DE (1) | DE60025790T2 (en) |
ES (1) | ES2258436T3 (en) |
IT (1) | IT1314350B1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB940888A (en) * | 1961-01-26 | 1963-11-06 | Rheinmetall Gmbh | Method of manufacturing threaded spindles |
US3721793A (en) * | 1971-07-19 | 1973-03-20 | Inst Elektroswarki Patona | Spiral-seam weld pipe and tube mill |
US3857159A (en) * | 1973-09-27 | 1974-12-31 | Pacific Roller Die Co Inc | Pipe forming method |
DE2645946C2 (en) * | 1976-10-12 | 1982-08-19 | Witzenmann GmbH, Metallschlauch-Fabrik Pforzheim, 7530 Pforzheim | Multi-layer corrugated pipe for exhaust pipes of internal combustion engines |
NL8702946A (en) * | 1987-12-07 | 1989-07-03 | Dec Holding Bv | Mfg. thin-walled aluminium tube - which has smooth walls formed by stripp of flexible foil wound up on mandrel, possibly in overlapping parts, helically, or in continuous stri |
AT394149B (en) * | 1989-07-10 | 1992-02-10 | Moldrich Metallwaren Gmbh | METHOD FOR PRODUCING TUBES FROM A METAL STRIP |
-
1999
- 1999-12-30 IT IT1999MI002753A patent/IT1314350B1/en active
-
2000
- 2000-11-22 ES ES00125604T patent/ES2258436T3/en not_active Expired - Lifetime
- 2000-11-22 EP EP00125604A patent/EP1112787B1/en not_active Expired - Lifetime
- 2000-11-22 AT AT00125604T patent/ATE316829T1/en not_active IP Right Cessation
- 2000-11-22 DE DE60025790T patent/DE60025790T2/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
None |
Also Published As
Publication number | Publication date |
---|---|
EP1112787A3 (en) | 2002-07-31 |
ITMI992753A0 (en) | 1999-12-30 |
EP1112787B1 (en) | 2006-02-01 |
IT1314350B1 (en) | 2002-12-09 |
ATE316829T1 (en) | 2006-02-15 |
DE60025790D1 (en) | 2006-04-13 |
ES2258436T3 (en) | 2006-09-01 |
DE60025790T2 (en) | 2006-11-02 |
ITMI992753A1 (en) | 2001-06-30 |
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