| 摘要 |
979,935. Refrigerating; heat exchange apparatus. SULZER FRERES S.A. Aug. 8, 1962 [Aug. 15, 1961], No. 30433/62. Headings F4H and F4S. A gas is cooled by expansion in a turbine 3 which drives a compressor 10 through a gasborne shaft 9, the compressor being located in a closed gas cycle which also includes a heat exchanger 31 and an adjustable throttle 32. Gas of the same chemical composition is used in the turbine; the shaft bearings and the closed gas cycle and the heat exchanger 31 is so constructed that the pressure drop therein is at least equal to that produced in the throttle 32. It is stated that the consequent increased velocity of the gas flowing through the heat exchanger results in better heat transfer so that the size of the heat exchanger and hence the volume of the closed gas cycle may be reduced. Gas from the outlet 12 of the compressor 10 passes downwardly through part annular ducts 33 in the heat exchanger to an annular duct 43 and thence upwardly through return ducts 33a to the throttle 32 and compressor inlet 11, while cooling water supplied through a pipe 49 flows in intermediate ducts 48. The throttle 32 is adjusted axially by a hand wheel 36 and may be controlled automatically, in dependence on the temperature in the refrigerating circuit, to vary the turbine speed. Corrugated strips 42 are provided in duets 33 and 33a. In the embodiment of Fig. 4 (not shown) the heat exchanger is formed as a cylindrical block having sets of bores arranged in circles of different radii and having open-ended tubes therein, the gas and cooling liquid being arranged to flow in the tubes and bores of alternate circles. Reference has been directed by the Comptroller to Specification 870,091.
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