Abstract
Of the three types of rotary compressors, namely, the centrifugal blower, the gear-type and the eccentric rotor with telescopic blade, the last is the least efficient. Particulars are given by the author, however, of a new and improved construction of this type in which leakage, friction and packing troubles have been eliminated to such an extent that a volumetric efficiency of 92 per cent at seven compressions (100 lb. per sq. in.) is said to be commercially obtainable. It is also stated that this compressor will, without adjustment or alteration, handle gas or air, or a liquid, or a gas and a liquid at the same time, and that it is possible to obtain a pressure of 500 lb. in a single-stage machine and 1000 lb. in three stages with the three units on the same shaft.
The uses of the rotary compressor are enumerated in the paper and its special advantages are set forth, these being (1) small weight per unit of capacity, (2) small amount of floor space required, (3) small initial cost of installation, (4) employment of direct drive, (5) small amount of headroom required, (6) simplification of construction and small amount of adjustment or repair, and (7) auto-lubrication.
