| 摘要 |
1497742 Circumferential-flow pumps SIEMENS AG 7 Feb 1975 [26 Feb 1974] 5415/75 Heading F1C In a compressor comprising a lateral channel 1 entering between an inlet port 4 and an outlet port 5, some of the compressed gas trapped in the spaces between the impeller vanes 3 during the passage of the vanes past the sealing land 6 which separates the inlet and outlet ports is discharged at an opening 7 to a return line 8 leading to an opening 9 in the lateral channel, the cross-sectional area of the lateral channel being increased downstream of the opening 9 to accommodate the returned flow. More than one return line may be provided. The removal, via the line or lines 8, of gas which would otherwise have been carried around to the inlet end of the lateral channel 1 permits a larger amount of gas to be drawn in through the inlet port 4. |
