Cold air refrigerating system and turborxpander turbine for this system

Abstract

An air-cooling device comprises compressor ( 1 ). Double cavity heat exchanger ( 2 ), turbo expander ( 6 ) and the freezing chamber ( 3 ) containing fan ( 5 ) and air cooler ( 4 ). Fan ( 7 ) is mounted on the same shaft with the turbo expander ( 6 ). The first cavities of the heat exchangers ( 9 and 2 ), moist separator ( 8 ) and the second cavity of the heat exchanger ( 2 ) are connected with the compressor ( 1 ) input in sequence. In the other appearance the device comprises compressor ( 44 ) and turbo expander ( 49 ), double cavity heat exchanger ( 45 ), freezing chamber ( 46 ) containing fan ( 48 ) and air cooler ( 47 ), double cavity vaporization heat exchanger a ( 51 ) and moist separator ( 50 ). The first cavities of the vaporization heat exchangers ( 51 and 45 ), moist separator ( 50 , turbo expander ( 49 ), air cooler ( 47 ) and the second cavity of the heat exchanger ( 45 ) are in sequence connected with the compressor input ( 44 ). The bearing disk ( 67 ) of the turbine wheel ( 66 ) is constructed with inter blade canals ( 69 ) conjugates by means of the flutes ( 70 ) with the meridional disk surface ( 67 ). The canal surface ( 69 ) contain longitudinal micro canal ( 71 ). The radius of the micro canal ( 71 ) cross cut IS 0.1-1.0 of the radius (Rf) of the flute ( 70 ), the pitch (t) between the micro canals ( 71 ) is not more than the double radius (Rk) and the height (h) of the micro canal ( 710 is about 0.2-1.0 of the radius (Rk).

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       14 . A cold air refrigeration system comprising a compressor ( 44 ) and a turbo expander ( 49 ) with a turbine wheel ( 66 ), all mounted on a common shaft, a freezing chamber ( 46 ) containing a fan ( 48 ) and an air cooler ( 47 ) CHARACTERISED in that the system includes a double cavity vaporization heat exchanger ( 51 ), a moisture separator ( 50 ) and a double cavity heat exchanger ( 45 ), a first cavity of the vaporization heat exchanger ( 51 ), a first cavity of the heat exchanger ( 45 ), the moisture separator ( 50 ), the turbo expander ( 49 ), the air cooler ( 47 ) and a second cavity of the heat exchanger ( 45 ) being connected with an input of the compressor ( 4 ) sequence.  
   
   
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       23 . The turbine wheel of a turbo expander comprising a bearing disk ( 67 ) having blades ( 68 ) and inter blade canals ( 69 ) defined by side surfaces of adjacent blades ( 68 ) joined by flutes ( 70 ) with a meridional disk surface ( 67 ) containing longitudinal micro canals ( 71 ) with cross sections as a part of a circle CHARACTERISED in that the radius Rk of the micro canal ( 71 ) cross section is 0.1-1.0 of the radius R 1  of the flute, the pitch (t) between the micro canals ( 71 ) is not more than the double radius (Rk) of the micro canal ( 71 ) and the height (h) of the micro canal ( 71 ) is 0.2-1.0 of the radius (Rk) of the micro canal ( 71 ) cross section.