| 摘要 |
A convection part has one or more double-walled pipes (22, 24) which fit tightly at their ends inserted in a boiler (12). The pipes in turn contain a concentric central pipe (26) which divides them into forward and return feed chambers for the medium to be heated. The two walls of the first pipes, together with that of the central pipe, are fastened at the end turned away from the interior of the boiler in three walls (28,30,32) at right-angles to the longitudinal pipe direction. These three walls are so spaced that between them is formed a chamber in contact with the circular space limited by the pipes. |
