| 摘要 |
<p>1. Heat exchanger having tubes (18), support plates (30) with perforations (32, 132) traversed by the tubes and frustum-shaped securing bushes (24, 124), at least one of these bushes being placed around each tube in a perforation (32, 132) formed in a corresponding support plate (30) and crimped on said support plate, characterized in that the tubes (18) are helically wound in successive layers about a common axis (x, x'), each layer of tubes (18) traversing a row of perforations (32, 132) formed in a different support plate (30), the said perforations (32, 132) being radially open (31) with respect to said axis (x, x') over a width slightly exceeding the external diameter of the tubes (18), connecting parts (38, 138, 238) being placed between the support plates of two layers of successive tubes, said parts allowing a relative displacement between the plates in a radial direction (y, y') with respect to said axis (x, x') whilst still providing a relative securing effect between the plates in a transverse direction (z, z') orthogonal to said axis (x, x') and to said radial direction (y, y').</p> |
