| 摘要 |
<p>1347219 Valves COMMISSARIAT A L'- ENERGIE ATOMIQUE 9 March 1972 [9 March 1971] 11032/72 Heading F2V [Also in Divisions G4-G6] In order to permit localization of a burst can in a nuclear reactor fuel assembly, sampling tubes 1 connected to extensions of channels containing the fuel assemblies are fixed in a distribution plate 2 supporting an internallytoothed ring 4 constituting a sun gear. A turntable 6 freely mounted for rotation within the ring 4 has a recess 12 within which is rotatably mounted a planet gear 14 in meshing engagement with the sun gear 4. The planet gear 14 and the turntable 6 are mounted at the lower ends of two parallel shafts 15, 16 coupled to each other by an arm 18 rigidly fixed to the shaft 16 but secured to the shaft 15 only against axial motion. Rotation of the turntable 6 within the sun gear 4 causes both displacement of the planet gear 14 with the turntable 6 and rotation of the planet gear 14 about its own axis. Each tooth of the planet gear 14 therefore describes a hypocycloid within the interior of the sun gear 4. The planet gear 14 is penetrated by a duct 20 which is connected via a pipe 22 with an apparatus (not shown) for measuring the radioactivity of gaseous samples. The succession of hypocycloid arcs (A-B, B-C, &c.) described by the duct 20 as the turntable 6 rotates results in it communicating in turn with each of the sampling tubes 1. The turntable 6 is preferably driven by means of a sleeve 24 which extends through the reactor vessel to a drive system. Within the sleeve 24, a tube 30 is coupled to the pipe 22 by means of a rotary seal 32.</p> |
