GB121522A - Improvements in or relating to Refrigerating Apparatus. - Google Patents

Abstract

121,522. Ransomes & Rapier, and Cra cknell, R. J. Dec. 19, 1917. Refrigerating, compression machines for, of the type comprising co-axial rotary casings forming a condenser and evaporator, one of the casings containing the compressor. A rotary compressor is employed similar to that described in Specification 121.518, [Class 110 (i), Centrifugal and screw fans &c.], and comprising one or more rotors having helical channels around their peripheries and arranged in an eccentric rotating drum containing a liquid acting as a piston. The casings A, B forming respectively the evaporator and condenser are closed at their inner ends by covers A<2>, B<2> connected by a cylinder F serving as a distance member and forming an insulating chamber. The compressor may be arranged either in the condenser or in the evaporator, or a compressor may be arranged in each, to obtain two. stage compression. The liquefied refrigerant passes from the periphery of the condenser to the periphery of the evaporator through a pipe M having its ends bent outwards radially, the flow being controlled by centrifugal action and the difference in pressure. The condenser rotates in contact with cooling water and the evaporator in contact with brine. The rotors G of the compressor are formed with a wide channel G<3>, Fig. 3, with parallel walls G<10> for one turn, and a narrow channel G<4>, shallower than the first, for a second turn, one rotor being right handed and the other left handed. They are spaced apart by crescentshaped parts G" serving to deflect liquid refrigerant on to the shaft away from the opening C<1> leading to the condenser through a hollow portion of the shaft. The drum J is mounted on ball bearings on eccentrics K held stationary by a weight K<2> and themselves mounted on ball bearings on the shaft. Sleeves J<2> with flared ends J<3> project towards the rotors and prevent the escape of liquid even if the shaft is tilted. The refrigerant employed may be ethyl chloride, and mercury may be employed as the liquid in the drum. Gas from the evaporator casing passes through passages K<3>, K<4>, to an opening G<9>, Fig. 3, in the outer wall of the rotor channel, and is delivered through the central space between the rotors to the openings C<1> in the shaft. The two rotors may be replaced by a single rotor having channels running in the same direction, and the inlet and outlet openings for gas may be distributed around the rotor to equalize the pressure on the rotor. The weight K<2> may be fitted with a scoop to deliver refrigerant over the drum to cool it, and the condenser may be formed with internal radial ribs or fins. The space formed by the cylinder F may be evacuated, and the whole apparatus is exhausted before being charged with refrigerant.