TURBOREFRIGERATING DEVICE Russian patent published in 2004 - IPC

FIELD: cooling equipment, particularly for air turbocompressors for obtaining cold in temperature range of -60 C to -120 C. SUBSTANCE: turborefrigerating device operates on recuperative air cycle. Device comprises compressor unit A, cooling block B. Compressor unit A includes compressor, end refrigerator, oil-and-moisture separator, drying means, fine filter, low-pressure filter. Cooling block B has recuperative heat-exchanger, turbo-expander, cooling chambers and pumping means. Loading means of bushing type is arranged at turbo-expander shaft cantilever free end. Bushing rotary part has annular grooves with relation between working part lengths and bushing radius equal to 0.1 - 0.2. Axial grooves are formed on bushing stator part mating surface having relation between working parts length and bushing radius equal to 0.1 - 0.2. EFFECT: precise temperature regulation with 1 C accuracy; increased turbo-expander semi-frequency self-oscillation vibrostability, oil overheating prevention during rotation with high frequency of more than 100000 revo. 3 dwg