| 摘要 |
1,130,872. Tubular heat exchangers. E. I. DU PONT DE NEMOURS & CO. 13 Jan., 1966 [14 Jan., 1965], No. 1646/66. Heading F4S. A heat exchanger comprises a bundle of parallel thermoplastic tubes fastened to a sleeve 29 of metal, or metal lined with a thermoplastics material. The sleeve may be circular, hexagonal or rectangular and may alternatively. be of perforated metal embedded in thermoplastic material or may be of high melting-point thermoplastic material with a liner of low melting-point thermoplastic material. The tubes may be formed of spirally wound thermoplastic tapes, of coaxial and contiguous tubes or a combination of thermoplastic tapes spirally wound about thermoplastic tubes. The tube bundle may be fastened ino a metal or plastics shell to form the heat exchanger. The tube assembly may be utilized for cooling oil or gas or as an immersion heater or cooler but these applications are not described in detail. Dimensions of the actual construction are given. The tubes may have a sleeve at both ends or may be bent to U-shape, or as shown in Fig. 7, may be bent to U-shape and have one end attached to a sleeve 28 and the other end attached between sleeve 28 and an outer sleeve 29; alternatively the tubes could be straight with inner and outer sleeves 28, 29 at both ends. In a further construction (Fig. 8) the tubes are fused to a sleeve at each end and the portions of the tubes between the sleeves separated to form a flat warp (30). |
