CN100594092C - Method for manufacturing heat exchange tube with a plurality of straight fins - Google Patents
Method for manufacturing heat exchange tube with a plurality of straight fins Download PDFInfo
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- CN100594092C CN100594092C CN200810195415A CN200810195415A CN100594092C CN 100594092 C CN100594092 C CN 100594092C CN 200810195415 A CN200810195415 A CN 200810195415A CN 200810195415 A CN200810195415 A CN 200810195415A CN 100594092 C CN100594092 C CN 100594092C
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Abstract
The invention discloses a manufacturing method of a multi-straight-fin heat exchange tube, which is characterized by comprising the steps of: (1) sizing the shape of outer straight fins of a base tube; (2) welding the outer straight fins of the base tube, namely, putting a half-finished work piece on a special working rack, arranging a plug provided with a water inlet tube, a water outlet tube anda valve at two ends of the work piece, connecting the water inlet tube and the water outlet tube, inletting circulating cooling water, welding a first pair of straight fins in a two-side level and matching welding manner, turning the tube for 90 degrees after finishing the welding of the first pair of straight fins, welding a second pair of straight fins and welding other straight fins with the same method; (3) straightening the tube; (4) processing the outer appearance of the tube; (5) examining the tube. The manufacturing method of the multi-straight fin heat exchange tube has simple manufacturing technique and low labor intensity, avoids the situation of the serious deformation and twisting of the base tube and fins in the manufacturing process of the heat exchange tube and improves the quality of the multi-straight-fin heat exchange tube.
Description
Technical field
The present invention relates to a kind of metallurgy, electric power of being applied to, especially be applied to the manufacture method of the multiple straight fin heat exchange tube in medium-and-large-sized heating of petrochemical industry and the heat transmission equipment.
Background technology
As far back as the eighties two straight fins extended surface tubes occur, the beginning of the nineties standard industry standard: JB/T5255-91.Extended surface tube is two straight fins of weldering on a foundation pipe, and parent tube length generally is not more than 10 meters, is confined to boiler industry.Because two straight fins of its weldering can not farthest increase effective heat exchange area, its application has been subjected to very big restriction.At present, need a large amount of overlength, many straight fins pipe to carry out the heating and the heat exchange of medium, fluid in metallurgy, electric power, petrochemical industry, this product has welded some straight fins mainly due to adding on a foundation pipe, make effective heat exchange area increase several times, when making heat transmission equipment, significantly reduced the quantity of heat exchanger tube, thereby dwindled heat exchanger volume, steel have been saved, reduce cost, improved heat exchange efficiency simultaneously, reached the effect of energy-saving and emission-reduction.But in the manufacture process of overlength, many straight fins heat exchanger tube, on a foundation pipe, to weld some straight fins, because of welding produces the interior external carbuncle of expanding with heat and contract with cold, make parent tube and straight fins generation serious deformation and distortion, thereby do not reach the designing requirement of product and scrap.
Summary of the invention
Technical problem to be solved by this invention provides a kind of manufacture method of multiple straight fin heat exchange tube.
For solving the problems of the technologies described above, the invention provides a kind of manufacture method of multiple straight fin heat exchange tube, it is characterized in that: may further comprise the steps:
1) the outer straight fins of parent tube is finalized the design: make the straight fins typified form as requested, and make corresponding frock clamp, and parent tube is placed on the mould bases, the straight fins material flat steel is penetrated template, it is stretching that the two ends utilization tightens screw rod, adopts the manual electric arc welding direct welding that band steel is fixed on the parent tube;
2) to the outer straight fins welding of parent tube:
A) after outer fin spot welding is finished the semi-finished product workpiece is placed on the special-purpose movements and postures of actors, the plug with water inlet pipe, outlet pipe and valve is installed at two ends respectively, connects water inlet pipe and outlet pipe, feeds recirculated cooling water;
B) adopt both sides level equity welding method that first pair of straight fins welded;
C) finish the welding of first pair of straight fins after, with pipe fitting roll-over 90 degree, weld second pair of straight fins, adopt said method again other straight fins to be welded;
3) pipe fitting is carried out alignment: after all straight fins welding were finished, the method that adopts convex surface to add weldering was handled there being diastrophic pipe fitting to carry out alignment, suitably adds weldering according to bending deformation quantity, or adopts special die, carries out alignment by exerting pressure;
4) the pipe fitting outward appearance is handled: the outer fin of pipe fitting, welding bead are implemented mechanical grinding, remove welding slag and welding and fly slag, make heat exchanger tube straight attractive in appearance;
5) pipe fitting is detected: detection method is the water pressure test, and detected pressures is undertaken by design pressure, and amount detection is 100% of institute's converted products quantity.
The beneficial effect that the present invention reached:
Manufacture method of multiple straight fin heat exchange tube of the present invention, in the process that outside straight fins welds to pipe fitting, adopt the method for recirculated water cooling, and in the process of pipe fitting being carried out alignment, adopt convex surface to add the method for weldering, method of manufacturing technology is simple, hand labor intensity is low, in the heat exchanger tube manufacture process, avoid simultaneously the situation of parent tube and straight fins gross distortion and distortion to take place, improved the quality of multiple straight fin heat exchange tube.
Description of drawings
Fig. 1 is the longitudinal sectional drawing of a kind of multiple straight fin heat exchange tube of employing manufacture method of multiple straight fin heat exchange tube manufacturing of the present invention;
Fig. 2 is the transverse cross-sectional view of a kind of multiple straight fin heat exchange tube of employing manufacture method of multiple straight fin heat exchange tube manufacturing of the present invention;
Fig. 3 is the structural representation when straight fins welds in the manufacture method of multiple straight fin heat exchange tube of the present invention;
Fig. 4 is the straight fins welding sequence schematic diagram of a kind of embodiment of manufacture method of multiple straight fin heat exchange tube of the present invention;
Fig. 5 is the band steel of a kind of multiple straight fin heat exchange tube of employing manufacture method of multiple straight fin heat exchange tube manufacturing of the present invention and the welding line structure schematic diagram of parent tube welding;
Fig. 6 is a kind of multiple straight fin heat exchange tube band steel of manufacture method of multiple straight fin heat exchange tube manufacturing of the present invention and the manufacturing dimension deviation schematic diagram of parent tube.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.Fig. 1 is the longitudinal sectional drawing of a kind of multiple straight fin heat exchange tube of employing manufacture method of multiple straight fin heat exchange tube manufacturing of the present invention; Fig. 2 is the transverse cross-sectional view of a kind of multiple straight fin heat exchange tube of employing manufacture method of multiple straight fin heat exchange tube manufacturing of the present invention; Fig. 3 is the structural representation when straight fins welds in the manufacture method of multiple straight fin heat exchange tube of the present invention.
A kind of manufacture method of multiple straight fin heat exchange tube of the present invention, it is characterized in that: may further comprise the steps: 1) parent tube 100 outer straight fins 200 are finalized the design: make the straight fins typified form as requested, and make corresponding frock clamp, parent tube is placed on the mould bases, the straight fins material flat steel is penetrated template, it is stretching that the two ends utilization tightens screw rod, adopts the manual electric arc welding direct welding that band steel is fixed on the parent tube;
2) to the outer straight fins welding of parent tube:
A) after outer fin spot welding is finished the semi-finished product workpiece is placed on the special-purpose movements and postures of actors, the plug with water inlet pipe 300, outlet pipe 400 and valve is installed at two ends respectively, connects water inlet pipe 300 and outlet pipe 400, feeds recirculated cooling water;
B) adopt both sides level equity welding method that first pair of straight fins welded;
C) finish the welding of first pair of straight fins after, with pipe fitting roll-over 90 degree, weld second pair of straight fins, adopt said method again other straight fins to be welded;
3) pipe fitting is carried out alignment: after all straight fins welding were finished, the method that adopts convex surface to add weldering was handled there being diastrophic pipe fitting to carry out alignment, suitably adds weldering according to bending deformation quantity, also can adopt special die, carries out alignment by exerting pressure;
4) the pipe fitting outward appearance is handled: the outer fin of pipe fitting, welding bead are implemented mechanical grinding, remove welding slag and welding and fly slag, make heat exchanger tube straight attractive in appearance;
5) pipe fitting is detected: detection method is the water pressure test, and detected pressures is undertaken by design pressure, and amount detection is 100% of institute's converted products quantity.
The described the 1st) in the step, described spot pitch≤50mm.
The described the 2nd) in the step, the recirculated cooling water of feeding is for breaking away from subcycle water, and before feeding recirculated cooling water, drain the air in the pipe, and inflow temperature is below 20 ℃ during welding, leaving water temperature is controlled at below 45 ℃.
The described the 2nd) in the step, when carrying out both sides level equity welding, carry out manual electric arc welding or carbon dioxide gas arc welding simultaneously in the parent tube both sides.
Described parent tube external diameter is Φ 38-Φ 219mm.
Described parent tube and straight fins material are carbon steel or stainless steel.
Described parent tube length is in 24 meters, and the straight fins number is more than 4.
Fig. 4 is the straight fins welding sequence schematic diagram of a kind of embodiment of manufacture method of multiple straight fin heat exchange tube of the present invention.Among this embodiment, the straight fins number is 24, and in the process to the outer straight fins welding of parent tube, the order of straight fins welding is for to carry out successively from 12 pairs of fins of the 1st pair of fin to the.
Fig. 5 is the band steel of a kind of multiple straight fin heat exchange tube of employing manufacture method of multiple straight fin heat exchange tube manufacturing of the present invention and the welding line structure schematic diagram of parent tube welding; Fig. 6 is a kind of multiple straight fin heat exchange tube band steel of manufacture method of multiple straight fin heat exchange tube manufacturing of the present invention and the manufacturing dimension deviation schematic diagram of parent tube.
The described the 2nd) in the step, the welding quality of band steel and parent tube meets following requirement:
A) weld penetration of the welding of band steel and parent tube meets the regulation of table 1;
B) welding of band steel and parent tube should be continuous, and the weldering of leakage must not be arranged;
C) appearance of weld should be smooth, smooth, answers rounding off between weld seam and the mother metal, and face of weld does not allow defectives such as crack, slag inclusion, arc crater;
D) face of weld between band steel and the parent tube does not allow the single pore of diameter greater than 2mm, does not allow to exist simultaneously intensive pore (3 above apertures join together) yet or becomes steam vent (100mm weld seam linear extent inner air vent number is more than 5 arbitrarily);
E) the weld seam undercut degree of depth must not be greater than 0.5mm in the parent tube side, and the undercut total length is not more than 2.5% of parent tube length altogether, and continuous length is no more than 500mm, and the band steel side undercut degree of depth is not more than 0.8mm.
Must not burn parent tube when f) band steel and parent tube weld.
In addition, the manufacturing dimension deviation of band steel and parent tube meets following requirement:
A) the shifted by delta e at band steel center and parent tube center and inclination Δ a (individual event and superposition value) must not surpass 1.5mm.
B)
Wherein t is the external diameter of finned tube, the deviation that Δ t allows for the finned tube external diameter.
C) linearity of straight fins pipe is not more than 2.0mm for every meter, and is no more than 6.0mm in the length range.
D) the side sway degree of straight fins pipe is not more than 2.0mm for every meter, and is no more than 6.0mm in the length range.
E) length is worth in its length range less than the distortion of the straight fins pipe of 9m and must not surpasses 3.0mm, and length is worth in its length range more than or equal to the distortion of the straight fins pipe of 9m must not surpass 4mm.
Table 1
| Gas-shield automatic welding, manual welding |
| K 1k 2≥4 |
| a 1+a 2≥1.25δ |
| t≥1.0 |
| S＜5 b≥0.4s S≥5 b≥2.0s |
Claims (9)
1. manufacture method of multiple straight fin heat exchange tube is characterized in that: may further comprise the steps:
1) the outer straight fins of parent tube (100) (200) is finalized the design: make the straight fins typified form as requested, and make corresponding frock clamp, parent tube is placed on the mould bases, the fin material band steel is penetrated template, it is stretching that the two ends utilization tightens screw rod, adopts the manual electric arc welding direct welding that band steel is fixed on the parent tube;
2) to the outer straight fins welding of parent tube:
A) after outer fin spot welding is finished the semi-finished product workpiece is placed on the special-purpose movements and postures of actors, the plug with water inlet pipe (300), outlet pipe (400) and valve is installed at two ends respectively, connects water inlet pipe (300) and outlet pipe (400), feeds recirculated cooling water;
B) adopt both sides level equity welding method that first pair of straight fins welded;
C) finish the welding of first pair of straight fins after, with pipe fitting roll-over 90 degree, weld second pair of straight fins, adopt said method again other straight fins to be welded;
3) pipe fitting is carried out alignment: after all straight fins welding were finished, the method that adopts convex surface to add weldering was handled there being diastrophic pipe fitting to carry out alignment, suitably adds weldering according to bending deformation quantity, or adopts special die, carries out alignment by exerting pressure;
4) the pipe fitting outward appearance is handled: the outer fin of pipe fitting, welding bead are implemented mechanical grinding, remove welding slag and welding and fly slag, make heat exchanger tube straight attractive in appearance;
5) pipe fitting is detected: detection method is the water pressure test, and detected pressures is undertaken by design pressure, and amount detection is 100% of institute's converted products quantity.
2. manufacture method of multiple straight fin heat exchange tube according to claim 1 is characterized in that: the described the 1st) in the step, spot pitch≤50mm.
3. manufacture method of multiple straight fin heat exchange tube according to claim 1, it is characterized in that: the described the 2nd) in the step, the recirculated cooling water that feeds is for breaking away from subcycle water, and before feeding recirculated cooling water, drain air in the pipe, inflow temperature is below 20 ℃ during welding, and leaving water temperature is controlled at below 45 ℃.
4. manufacture method of multiple straight fin heat exchange tube according to claim 1 is characterized in that: the described the 2nd) in the step, when carrying out both sides level equity welding, carry out manual electric arc welding or carbon dioxide gas arc welding simultaneously in the parent tube both sides.
5. manufacture method of multiple straight fin heat exchange tube according to claim 1 is characterized in that: described parent tube length is in 24 meters, and the straight fins number is more than 4.
6. manufacture method of multiple straight fin heat exchange tube according to claim 5 is characterized in that: described straight fins number is 24.
7. manufacture method of multiple straight fin heat exchange tube according to claim 6 is characterized in that: in the process to the outer straight fins welding of parent tube, the order of straight fins welding is for to carry out successively from 12 pairs of fins of the 1st pair of fin to the.
8. manufacture method of multiple straight fin heat exchange tube according to claim 1 is characterized in that: described parent tube external diameter is 38-219mm.
9. manufacture method of multiple straight fin heat exchange tube according to claim 1 is characterized in that: described parent tube and straight fins material are carbon steel or stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810195415A CN100594092C (en) | 2008-10-31 | 2008-10-31 | Method for manufacturing heat exchange tube with a plurality of straight fins |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810195415A CN100594092C (en) | 2008-10-31 | 2008-10-31 | Method for manufacturing heat exchange tube with a plurality of straight fins |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101386122A CN101386122A (en) | 2009-03-18 |
| CN100594092C true CN100594092C (en) | 2010-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810195415A Expired - Fee Related CN100594092C (en) | 2008-10-31 | 2008-10-31 | Method for manufacturing heat exchange tube with a plurality of straight fins |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102756201A (en) * | 2012-07-19 | 2012-10-31 | 张家港华东锅炉有限公司 | Four-finned tube submerged arc welding device |
| CN103528043A (en) * | 2013-09-13 | 2014-01-22 | 无锡锡东能源科技有限公司 | Economizer pipe structure and processing technology thereof |
| CN104864759A (en) * | 2015-05-29 | 2015-08-26 | 西安交通大学 | Plate-fin heat exchange component and welding device thereof |
| CN109227034B (en) * | 2017-12-31 | 2020-01-07 | 绍兴市华获智能装备有限公司 | Manufacturing method of twisted piece and metal twisted piece |
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| CN101386122A (en) | 2009-03-18 |
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Granted publication date: 20100317 Termination date: 20131031 |