Heat exchanging tube with spiral groove

Abstract

The present invention relates to a heat transfer tube with spiral groove, comprising a stainless steel tube body with inward convex spiral groove on surface, wherein the stainless steel tube body possesses unequal height and width in the cross sectional view. In the EGR (Exhaust Gas Recirculation) cooling system for automotive engine, such kind of spiral groove tube with the unequal height and width in the cross-section acting as the heat transfer tube for the cooler make the cooler gain higher heat transfer effect, and it is hard to make dirt deposited inside or outside the tube, which greatly improves the emissions performance for automotive engine, and satisfies higher requirement of environmental protection.

1 . A heat transfer tube with spiral groove, comprising a stainless steel tube body with inward convex spiral groove on surface, characterized in that the stainless steel tube body possesses unequal height and width in cross-sectional view. 
     
     
         2 . The heat transfer tube with spiral groove of  claim 1 , characterized in that the sectional shape of the stainless steel tube body is rectangle, and adjacent two sides are connected by arc transition. 
     
     
         3 . The heat transfer tube with spiral groove of  claim 2 , characterized in that the sectional shape of the stainless steel tube body is consist of two relative short sides and two relative long sides, wherein the short sides appear as outward convex arcs and the long sides are straight lines. 
     
     
         4 . The heat transfer tube with spiral groove of  claim 3 , characterized in that the two relative long sides appear as outward convex arcs. 
     
     
         5 . The heat transfer tube with spiral groove of  claim 1 , characterized in that the sectional shape of the stainless steel tube body is ellipse. 
     
     
         6 . The heat transfer tube with spiral groove of  claim 1 , characterized in that the spiral groove is one or multiple. 
     
     
         7 . The heat transfer tube with spiral groove of  claim 6 , characterized in that the one or multiple spiral groove is set continuously or intermitted. 
     
     
         8 . The heat transfer tube with spiral groove of  claim 1 , characterized in that the sectional shape of the stainless steel tube body is “U” shape or “V” shape. 
     
     
         9 . The heat transfer tube with spiral groove of  claim 8 , characterized in that the spiral groove connects to the surface of the stainless steel tube body by arc transition.