Double-walled tube and the cooling circuit device

摘要

A double-walled tube contains an outer tube (161) which, with a first and a second opening at a first and a second end portion of the outer tube is provided in a longitudinal direction of the tube, and an inner tube (162), which in the outer tube is inserted, is a channel (160a) between the outer tube and the inner tube is to define. An inlet portion (163) is connected to the outer pipe in order, by means of the first opening of the channel (160a) to communicate, and an outlet portion (164) is connected to the outer pipe in order, by means of the second opening with the channel to communicate. In the double-walled pipe, the outer tube and the inner tube can be arranged in such a way that it comprises a widened portion (160b) with a widened cross-sectional area in the first channel, and the widened section, at least on a portion near the inlet portion and the discharge section be provided. The internal tube can with a plurality of grooves (162b, 162d, 162e, 162f, 162g) be provided in the double-walled pipe.