COLD AIR REFRIGERATING SYSTEM AND TURBOEXPANDER TURBINE FOR THIS SYSTEM

摘要

The cold air refrigerating system comprises a compressor (1), a dual-chamber heat exchanger (2), a turboexpander (6) and a refrigerating chamber (3), with a fan (5) and air cooler (4) installed therein. The fan (7) is mounted on the same shaft with the turboexpander (6). The front chambers of the heat exchangers (9 and 2), a moisture separator (8) and the second chamber of the heat exchanger (2) are connected. In another embodiment, the system contains a compressor (44) and a turboexpander (49) a dual-chamber heat exchanger (45), a refrigerating chamber (46), with a fan (48) and an air cooler (47) installed therein, a dual-chamber evaporation heat exchanger (51) and a moisture separator (50). The front chambers of the evaporation heat exchangers (51 and 45), the moisture separator (50), turboexpander (49) an air cooler (47) and the second chamber of the heat exchanger (45) are connected in tandem with an inlet of the compressor(44). A bearing disc (67) of a turbine (66) is embodied with interblade bores (69) conjugated through chamfers (70) with the meridian surface of the disk (67). Longitudinal micro-chamfers (71) are made on the surfaces of the chamfers (69). A radius (Rk) of the cross-section of the micro-chamfer (71) constitutes 0.1 - 1.0 of the radius (Rch)of the chamfer (70), the pitch (t) between the micro-chamfers (71) does not exceed two radii (Rk), and the height (h) of the micro-chamfer (71) constitutes (0.2 - 1.0) of the radius (Rk).