DEP0051796DA - Process for the production of sub-chambers for water tube boilers - Google Patents
Process for the production of sub-chambers for water tube boilersInfo
- Publication number
- DEP0051796DA DEP0051796DA DEP0051796DA DE P0051796D A DEP0051796D A DE P0051796DA DE P0051796D A DEP0051796D A DE P0051796DA
- Authority
- DE
- Germany
- Prior art keywords
- sub
- chambers
- production
- water tube
- tube boilers
- 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.)
- Expired
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000000034 method Methods 0.000 title claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 3
- 238000005452 bending Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von Teilkammern für Wasserrohrkessel nach Patent .... (Anmeldung p 45 774).The invention relates to a method for the production of partial chambers for water tube boilers according to patent .... (Application p 45 774).
Nach dem Hauptpatent bestehen die Teilkammern aus Vierkantrohren, die einige wenige über die die Länge der Teilkammer verteilte Knickstellen aufweisen. Bisher hat man derartige Knick- oder Abbiegestellen dadurch hergestellt, daß man das Rohr an der betreffenden Stelle warm gebogen hat. Dies hat den Nachteil, daß das Gefüge des Rohrmaterials darunter leidet, z.B. wir die Wandungsstärke des Rohres an der Außenseite der Biegung schwächer.According to the main patent, the sub-chambers consist of square tubes that have a few kinks distributed over the length of the sub-chamber. So far, such kinks or bends have been produced by warming the pipe at the point in question. This has the disadvantage that the structure of the pipe material suffers, e.g. the wall thickness of the pipe on the outside of the bend is weaker.
Gemäß der Erfindung wird nunmehr die Teilkammer aus geraden Vierkantrohrstücken derart zusammengesetzt, daß die Stoßstellen mit den Knickstellen zusammenfallen. Die Stoßstellen werden zusammengeschweißt und anschließend wird die Teilkammer ausgeglüht.According to the invention, the sub-chamber is now composed of straight square pipe pieces in such a way that the joints coincide with the kinks. The joints are welded together and then the subchamber is annealed.
Bisher hatte man Bedenken gegen eine derartige Herstellung der Teilkammern, und zwar hauptsächlich aus folgenden Gründen:So far there have been concerns about such a production of the sub-chambers, mainly for the following reasons:
Die bisherigen Teilkammern besaßen eine große Zahl von Biegestellen. Diese sämtlich auf dem Wege der Stoßschweißung herzustellen, erschien umständlich und mit Rücksicht darauf, daß die Teilkammern im Betriebe heißen Feuergasen ausgesetzt werden, fürchtete man mangelnde Haltbarkeit der Schweißstellen.The previous sub-chambers had a large number of bending points. To manufacture all of these by butt welding appeared to be cumbersome and considering that the sub-chambers in the factory are exposed to hot fire gases, there was fear of a lack of durability of the welds.
Durch Rohrbiegung hergestellte Biege- und Knickstellen ergeben eine sanftere Biegung, was mit Rücksicht auf die dann geringer werdenden Strömungsverluste erwünscht erschien.Bends and kinks produced by pipe bending result in a gentler bend, which is with regard to the then decreasing flow losses appeared desirable.
Bei den Teilkammern nach dem Hauptpatent ist jedoch die Zahl der Knickstellen so gering, daß die durch die hervorgerufenen Strömungsverluste keine Rolle spielen. Die ebenso geringe Zahl der Schweißungen, die bei Teilkammern nach dem Hauptpatent erforderlich sind, verursacht nicht mehr Zeitaufwand als bei der Herstellung durch Biegung notwendig wäre, sondern weniger. Schließlich haben auch praktische Versuche ergeben, daß die Haltbarkeit der Schweißungen bei der in Frage stehenden Beanspruchung der Teilkammern praktisch unbegrenzt ist. Dagegen fällt nunmehr die Schwächung der Wandstärke der Teilkammer an der Knickstelle fort. Die Herstellung der Teilkammer nach dem Hauptpatent nach dem erfindungsgemäßen Verfahren hat sich daher als einfacher und einwandfreier erwiesen.In the case of the sub-chambers according to the main patent, however, the number of kinks is so small that the flow losses caused by the flow losses do not play a role. The equally small number of welds that are required for sub-chambers according to the main patent does not require more time than would be required for production by bending, but less. Finally, practical tests have shown that the durability of the welds is practically unlimited given the stress on the sub-chambers in question. On the other hand, the weakening of the wall thickness of the sub-chamber at the kink is now eliminated. The production of the sub-chamber according to the main patent by the method according to the invention has therefore proven to be simpler and more flawless.
Claims (1)
Family
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