| 摘要 |
PURPOSE:To redouble a heating surface conditionally almost same in length and in diameter of a heating tube compared with those of the existing heat exchanger by a method wherein the heating surface of an external heating tube, an internal heating tube and a core member are totally utilized as the heating surface, and the first and the second path form totally a double length of heating tubes. CONSTITUTION:In the heat exchanger with the heat transfer tube 21, exchanging heat with an external heating source and working medium is fluidized in the internal path, the both end opened internal heat transfer tube 25 is inserted in the one end closed external heat transfer tube 23, thereby the heat transfer tube 21 forms the multi layers structure and between the both comprise the internal path, forming the first path 29. And also in the axial centre of the internal tube 25 the core member 27 is inserted and between the both form the second path 35, and one end of the heat transfer tube 21 is interconnected with the first path 29, comprising the internal path. Further, the first protrusion 33 in axial centre, which forms either one end of the heat transfer tube 23 or 25 the other side is contacted, and the second protrusion 37 in axial centre direction, which forms either the heat transfer tube 25 or the core member 27 and the other side is contacted, are provided. |
