| 摘要 |
The invention is concerned with a heat-exchanger for arrangement behind the combustion chamber of a heating boiler. The heat-exchanger comprises water-carrying and gas-carrying interior chambers separated from one another by walls extending in parallel and being spirally coiled about a filling member and sealed against one another by bent edges. In order to so form a preferred form of embodiment of a heat-exchanger of this type so that the participating components, considering the coiling process, can be thinly dimensioned and nevertheless insure a pressure-stable final condition, thereby foregoing separate spacers actually not forming part of the heat-exchanger and thereby preventing or substantially preventing during coiling into a spiral the edges to be joined by welding from forming wave-type warpings and the wall faces from deforming, the heat-exchanger according to the invention is designed such that the wall which relative to the coil axis is the inner wall, at the top and at the bottom, includes externally bent edges having a width at most corresponding to the width of the water-carrying passage and the outer wall includes inwardly bent edges having a width corresponding, at most, to half the width (B), which edges overlap the edges of the inner wall or are in alignment therewith and are connected thereto in fluid-tight manner. Corrugated structures of both walls protruding into the gas-carrying passage open at the inlet and outlet sides, are arranged at a distance (D) from the edges in the walls extending substantially in parallel to the coil axis in a mutally supporting manner. The water-carrying passage is sealed at both ends of the spiral except for the forward and return connection openings.
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