Expansion device, compressor, fluid circuit with a device, system for heat recovery and compression refrigeration machine

摘要

Apparatus (101, 121, 131, 141, 151, 220) for converting thermal energy of a fluid into kinetic energy by expansion of the fluid comprising: a housing (102); a drive rod movably mounted in the housing (102); the housing (102) rotatably mounted shaft, wherein the drive rod or the shaft (107) is passed through a housing wall (103) of the housing and wherein in the region of the passage (106) has a gap (109) between the drive rod or the shaft (107) and the housing wall (103); a sealing device (110, 143, 153) for sealing the gap (109); an expansion chamber (112) disposed in the housing (102); a high pressure opening (104) for admitting a a low-pressure opening (105) for discharging the fluid expanded in the expansion chamber (112); at least one drive element connected to the drive rod and to the shaft (107), respectively, in the expansion chamber (112); wherein the expansion chamber (112), the drive rod or shaft (107) and the at least one drive element (108) are arranged and configured such that the drive rod or shaft (107) is expanded by expansion of the fluid in the expansion chamber (112) via the at least one drive element (108) is drivable; characterized in that the gap (109) is in fluid communication with the expansion chamber (112) such that expansion pressure prevailing upon expansion of the fluid in the expansion chamber (112) permits ambient fluid to enter the housing (102) through the gap (109 ) prevented or reduced.