| 摘要 |
An improved pump or compressor of the centrifugal type is provided, which has an impeller surrounded by a housing and having a disk, a first plurality of vanes provided near the disk, cover disks provided about the edges of the vanes, and a second plurality of vanes provided on the outwardly directed sides of the cover disks. Two pressure steps are created by the first plurality of vanes, each side of the disk and the cover disks. Two additional pressure steps are created by the second plurality of vanes, the cover disks, and pump housing walls that are located adjacently to the second plurality of vanes. Single or multiple flow conduits are arranged among the various inlets and outlets of the pressure steps, such that a fluid flows through the various pressure steps, with the last pressure step being closest to a motor unit and an outlet connected to the last pressure step being on the same side and facing in the same direction as an inlet. Demands for higher efficiencies, improved compactness and a simpler, more symmetrical design are met by this configuration.
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