A baffle and casing structure for rotary worm compression-expansion machines of the type having a rotor with oppositely facing working screws and a pair of pinion wheels cooperating with each such screw, the rotor being supported concentrically in a two-part casing having interior baffles to increase the volume of the working chamber defined by the worm threads, pinion wheels and casing interior. The pinion wheels are provided with teeth which engage not less than two nor more than three threads of the respective worms thereby to enable assembly of the pinion wheels through pockets accessible from the casing exterior.
展开▼
