DE6946628U - SMOKE OR HEATING GAS EXHAUST PIPES FOR BOILER. - Google Patents

Description

PATENT LAWYERS J

DIPL.-ING. AMTHOR DIPL.-ING. WOLF

Hans Vießmann _D -e fbankfuhta.m., February 15, 71

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Battenberg / Eder '^{; /}

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Smoke or hot gas exhaust pipes for boilers

The innovation concerns smoke and hot gas flue pipes for heating boilers made of sheet steel, which are horizontal or approximately horizontal are routed above or next to the combustion chamber to the boiler's smoke or hot gas exhaust *

Flue pipes are known as secondary heating surfaces for boilers. For optimal heat transfer, the cross-section of the smoke tubes must be matched exactly to the volume of the heating gases and the flow rate of the heating gases _o This cross-section from mood means that the cross-section of the smoke tubes can only be relatively small. The disadvantage here is that the tubes, which as a rule must have a not inconsiderable length, pass through and, under certain circumstances, generate vibrations. The known supporting of the pipes is complex and also makes the water circulation more difficult. In order to remedy this problem, pipes with larger cross-sections are already used and, for example, elements are inserted into the pipes in order to create a resistance for the flow of heating gas. These elements usually have to be made of heat-resistant material and are very expensive. _ ₂ _

The task of the present innovation is to remedy this situation, i.e. smoke and hot gas exhaust pipes are to be created, which are not subject to the risk of sagging, do not require any support in the water-bearing interior of the boiler and which do not necessarily require the use of expensive turbulence and flow resistance elements.

This task is with smoke and hot gas exhaust pipes of the mentioned Type solved, which are characterized according to the innovation in that the walls of the tubes at intervals with the inside of the tubes directed, known per se rib impressions are provided «.

The impressions have the effect that the flue gas flow is restricted, with which on the one hand an increase in speed is connected, or the maintenance of the same speed is guaranteed if one takes into account the volume reduction caused by the increasing cooling. Also make the imprints Flow obstacles that lead to turbulence.

In view of the increasing volume reduction, the rib impressions on the flue gas outlet side can be advantageous here arranged with decreasing distances and possibly also provided with increasing depth.

Furthermore, between the rib impressions in the pulling direction running and stiffening embossing provided

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which if they also have a beneficial effect on the flow should also be able to be arranged in a helical manner

Such rib impressions are quite general for stiffening purposes known in sheet metal processing and also in connection with heat exchangers, for example according to the British Patent 798 708, there, however, with the purpose of influencing the heat transfer coefficient to the effect that that this results in different sizes over a pipe length

Helical courses of rib embossing are known per se from British patent specification 521 548, but there as connected wave trains.

A graphic representation is used below Exemplary embodiments of the flue gas pipes according to the invention explained in more detail

In this illustration shows
Pig. 1 in section a flue gas exhaust pipe; Pig. 2 in section a variant of the flue gas exhaust pipe; Pig. 3 shows a further embodiment in section; Pig. 4 in view of a smoke exhaust pipe and Pig. 5 a flue gas draft tube in section along line VV in Pig. 4th

The tube 2 has inwardly directed impressions in its wall 1 3, which make it possible to make the pipe relatively large in cross-section. Without having to be relatively Large cross-section Heizgaszugeinsätze must be provided, their function now from the walls or the rib embossing 3 itself is taken over. Duron which is rib imprints advantageously also achieved at the same time that the tubes in itself Can compensate for thermal expansion.

Since the smoke tubes 2 in a boiler are unavoidably exposed to the fume gases in different ways, the smoke tubes expand different. There are considerable and different shear forces at the weld seams of the smoke tubes the two ends. Due to the embossed ribs, these shear forces are also reduced when the smoke tubes are subjected to different loads repealed or largely mitigated to a considerable extent. The same applies to all other smoke tubes in Figures 2-4.

The smoke pipe according to Pig. 2 differs from that according to FIG. 1 in that it increases toward the end 4 on the flue gas outlet Depth of impression, while in the case of the tube according to FIG. 3, the distances 5 get smaller.

In the case of the tube 2 according to FIG. 4, additional axially extending impressions 6 are provided, which are located between the rib impressions are arranged and which can optionally also run helically (not shown).

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The axial impressions can of course also run through the impressions 5.

Claims (5)

Protection claims: 1. Smoke or hot gas flue pipes for heating boilers made of sheet steel, which are guided horizontally or approximately horizontally above or next to the combustion chamber to the smoke or hot gas outlet of the boiler, characterized in that the walls (1) of the pipes (2) at intervals with are provided in the interior of the tubes directed rib impressions known per se. 2. smoke or * heating gas exhaust pipes according to claim 1, characterized in that the ribs impressions (3) to the smoke exhaust side (4) are designed increasingly deeper » 3 · Smoke and / or hot gas outlet pipes according to claim 1 and / or 2, characterized in that the rib impressions (3) are arranged with decreasing distances (5) towards the flue gas outlet side (4). 4 = smoke or Heizgasabzugsrohre according to any of claims 1 to 3, characterized that in each case gekennzeichne t _f between your rib impressions provided at intervals (3) at least two opposing embossings (6) running in the direction of pull are provided. -2- "V t ' 5. smoke or heating gas flue pipes according to claim 4, characterized in that the embossments (6) are helical in a manner known per se eng Rib impressions (3) are arranged.