Improvements in connection with Vacuum Pumps and Compressors used for the Pneumatic Transport of Grain and Granular Materials.

摘要

110,983. Bentham, C., and Simon, Ltd., H. Dec. 16, 1916. Piston packing.-Relates to packing for the pistons of air-compressing and exhausting pumps and in the pneumatic conveyance of grain and other granular materials in which it is impossible to use oil or grease as a lubricant in consequence of the presence of dust in the air. Fig. 1 shows a packing-ring c of so't metal in which are a number of recesses d containing graphite which serves as a lubricant. An ordinary metal packing-ring c1 provided wich a a soft-metal facing c2 may be used as shown in Fig. 2, or as shown in Fig. 3, the ordinary packing-ring c1 may be of U-section and contain a soft-metal ring c2.