| 摘要 |
1472651 Hot gas engines PHILIPS GLOEILAMPENFABRIEKEN NV 10 May 1974 [15 May 1973] 20776/74 Heading F1S [Also in Division F4] Between the co-operating walls of the piston 5, 6, 7 or 8 and cylinder 1, 2, 3 or 4 of a hot gas engine two axially spaced annular sealing elements are provided which are accommodated in circumferential grooves formed in one of the walls and which found an annular intermediate space which separates the working space from a further space and a duct 66, 67, 68 or 69 is provided in a piston rod for placing the working space in communication with a storage container 60 for working medium. The duct extends into the piston and opens into the intermediate space, the sealing element, piston ring 48, 49, 50 or 51, which separates the intermediate space from the working space together with the associated circumferential groove being constructed as a non-return valve which permits flow of working medium in one direction only between the intermediate space and the working space. As shown the non-return valves formed by the piston rings 48 to 51 are arranged to permit flow of working medium from the intermediate space to the compression spaces 27 to 30. Liquid supported rolling diaphrams may be provided as seals for separating the annular ducts 62-65 from the crank case 22. Specifications 689626, 1005591, 1166261 and 1251346 are referred to. |
