| 主权项 |
1. A turbomachine comprising:
a main housing having a housing passage extending along an axis and annular axially outwardly directed housing faces extending radially from ends of the housing passage; a shaft extending axially in the housing passage, having ends projecting axially past the housing faces, and having an outer shaft surface radially spaced from an inner surface of the housing passage and forming therewith an annular axially extending gap open at the housing faces; a respective radial impeller fixed to each end of the shaft outside the main housing and having an axially directed and radially extending impeller face axially spaced from and confronting the respective radial housing face and forming therewith a respective radially extending gap opening into the axially extending gap at the respective end of the housing passage; respective impeller housings forming respective flow spaces with the impellers outside the main housing, the radial gaps opening into the respective flow spaces; respective pluralities of spaced brush or slide seals engaged in the radial gaps between the respective radial faces of the main housing and impeller, defining therein a respective annular space, having faces extending perpendicular to the axis, fluidically separating the axial gap from the respective flow space, and preventing fluid flow through the housing passage and efficiency-reducing pressure losses, the axially extending outer surface of the shaft and inner surface of the passage being free of seals, the main housing being formed with a pump passage opening into the annular space between the seals; and means connected to the pump passage for feeding a blocking gas into the annular space or extracting a leakage gas from the annular space. |
