Variable area diffuser for compressor

Abstract

Abstract 1,231,152. Centrifugal compressors. DRESSER INDUSTRIES Inc. March 3, 1969 [March 11, 1968], No.11256/69. Heading F1C. In a centrifugal compressor comprising an annular diffuser passage 20, Fig. 1, between the impeller 14 and a discharge chamber 13, a wall part 21 is movable to vary the axial width of the diffuser passage. The wall part 21 is connected via four cylindrical posts 23 to a control ring 32 which can be partially rotated in either direction on ball bearings 42 to control the axial position of the wall part 21. Each post 23 is slidably connected to a cam in the form of a helical web 36 extending circumferentially around parts of the ring 32 and having an arcuate slot 37 which receives a stud 26 carrying a pair of washer-like bearing members 38, e.g. of bronze, having bosses (39), Fig.3 (not shown), extending into the slot. The ring 32 is moved by an arm 40, e.g. in accordance with a compressor operating condition. Gas circulation around the back of the wall part 21 is prevented by seal rings 27, 28. Pressure balancing passages 29 are provided through the wall part 21.

Inventors

• 👤 Fred K Kunderman

Bibliographic Details