GB1088463A - Improvements in or relating to refrigeration apparatus - Google Patents

Abstract

1,088,463. Refrigerating. W. G. NOLCKEN. July 13, 1964 [July 11, 1963], No. 27478/63. Heading F4H. [Also in Division F2] In a refrigeration system of the compression-type having a capillary expansion tube, valve means are provided for regulating the flow of refrigerant to said tube. As shown, the valve means comprises a chamber 1 which receives refrigerant from the condenser (not shown) through a tube 2 and contains a hollow vessel 3. The lower part of a capillary tube 5 extends through the roof of chamber 1 and into vessel 3, the arrangement being such that when the level of liquid refrigerant in chamber 1 is low the vessel 3 rises and closes the bottom of tube 5 as shown, and when the liquid level rises refrigerant enters vessel 3 through apertures 4, causing the vessel to sink and open tube 5. In a modification of this arrangement (Figs. 3 and 4, not shown) the lower end of tube 5 is closed by a plug and an orifice is provided in the wall of the tube above the plug, this orifice being opened or closed by a cylindrical sleeve secured to the bottom of vessel 3. In the modification of Fig. 6 (not shown), a second capillary tube (500) is provided which when the compressor is switched off and the liquid falls below a predetermined level (c) allows refrigerant vapour to pass to the evaporator to cause pressure equalization in the system. Alternatively the second capillary may be omitted and an orifice provided in the wall of the other tube (Fig. 5, not shown). In further modifications either a capillary tube communicating with the bottom of chamber 1 or an orifice in the lower part of vessel 3 is provided to lower the liquid level in the chamber and cause vessel 3 to sink during " off" periods, thereby permitting pressure equalization via tube 5 (Figs. 5 and 7, not shown).