公开(公告)号：US5704424A

公开(公告)日：1998-01-06

申请号：US726816

申请日：1996-10-07

申请人： Haruo Kohno ,  Takashi Kazama ,  Makoto Miyauchi ,  Yoshikatsu Arayama ,  Kohtaroh Nagahara ,  Shunroku Sukumoda

发明人： Haruo Kohno ,  Takashi Kazama ,  Makoto Miyauchi ,  Yoshikatsu Arayama ,  Kohtaroh Nagahara ,  Shunroku Sukumoda

IPC分类号： B21C37/20 ,  F28F1/40

CPC分类号： F28F1/40 ,  B21C37/20 ,  B21C37/207 ,  Y10S165/515 ,  Y10S165/525 ,  Y10T29/49384

摘要： The object of the present invention is to offer a heat transfer tube having a grooved inner surface, wherein the side edges of the board material do not form a waved shape and cracks do not form during tube expansion. In order to achieve this object, the grooved-inner-surface heat transfer tube of the present invention has a metallic tube with an inner circumferential surface, on which are formed a weld portion which extends in an axial direction of this metallic tube, a pair of projecting strip portions formed parallel to and separate from this weld portion, and a plurality of fins formed in an area between these projecting strip portions. The fins are formed with a constant angle with respect to the tube axis, and the ends of these fins are connected with the projecting strip portions. The thickness of the metallic tube within the grooves formed between the fins is made to increase in approaching the weld portion within an area surrounding the weld portion wherein the central angle is within 30.degree..about.90.degree. on both sides from the center of the weld portion.

摘要翻译： 本发明的目的是提供一种具有槽内表面的传热管，其中板材的侧边缘不形成波形，并且在管膨胀期间不形成裂纹。 为了达到上述目的，本发明的带槽内表面传热管具有内周面的金属管，在该金属管的轴向上形成有沿着该金属管的轴向延伸的焊接部， 与该焊接部平行且分开形成的突出带状部分，以及形成在这些突出条部之间的区域中的多个翅片。 翅片相对于管轴线形成为恒定的角度，并且这些翅片的端部与突出的条状部分连接。 在形成在翅片之间的槽内的金属管的厚度在焊接部分周围的区域内接近焊接部分时增加，其中中心角在焊接部分的中心两侧处于30度范围内90度 。