| 摘要 |
911,200. Links. ATOMIC POWER CONSTRUCTIONS Ltd., ASHLEY, J. W., and KNIGHT, L. J. Feb. 18, 1959 [Feb. 18, 1958], No. 5316/58. Class 80 (3). [Also in Groups XXV and XXXII] A resilient band for restraining the graphite structure of a nuclear reactor is formed of a number of links pivoted together, each link comprising a nest of coaxial tubes 1, 2, 3 and rods 4 . . . 13, the rods and tubes being held between pairs of end-plates 14... 20 which transmit the load successively between rods in tension and tubes in compression to give the resilient effect of a long link. As shown the nine rods 4... 12 are arranged in groups of three around the three nested tubes 1, 2, 3 and central rod 13. The tensile load is transmitted from coupling 24 as tension along central tie-rod 13 to end-plate 20, as compression in tube 1 to end-plate 14, as tension in three tie rods 6, 9, 12 (12 shown in Fig. 3) to end-plate 18, as compression in tube 2 to end-plate 15, as tension in tie rods 5, 11, 8 (8 shown in Fig. 1) to end-plate 17, as compression in tube 3 to end-plate 16, as tension in tie rods 7, 10, 4 (4 shown in Fig. 1) to end-plate 19 on coupling 21. The wall of each tube is thicker than that of the tube surrounding it so that each tube is better able to withstand corrosion than the tube surrounding it. The tubes may be of stainless steel and the rods of mild steel for temperature compensation. As shown, tube 1 is of mild steel and tubes 2, 3 of stainless steel. In the event of failure of one or more of the tubes the tensile stress is transmitted directly between the couplings 21, 24 by the central rod 13. In a modification the link comprises a single tube held between two endplates, one of which is coupled to a set of tie rods and the other of which is coupled either to a single central rod or a further set of rods. Specification 782,922 is referred to. |
