| 摘要 |
<p>Attached to nose ends 21 of a heat exchangers tube 20 are first and second projections 26a, 26b (fig 2A), 41a, 41b (fig 4) spaced from one another so that they do not form an enclosed space and collapse when hit by an object such as a stone that passes through a radiator grill of an automobile in order to protect the tube 20. The projections may be straight and parallel to each other, curved and face each other and end in a point thus providing better protection than the straight projections, or curved and face each other and end in a flat part (fig 5) and provide the maximum protection. The tube 20 comprises a peripheral wall 22 having an elongated circular cross sectional shape, a plurality of compartments 24 and 24a connected to flat wall portions 25 and divided from one another by divisional walls 23. Compartment 24a may be elongated cross sectional shape, an elliptical shape or perfect circular shape. Compartments 24 are typically rectangular in cross sectional shape but maybe triangular, trapezoidal, circular or a star shape. The tubes may be used in a condenser for an automobile, residential condenser and radiator oil cooler.</p> |
