| 摘要 |
In a centrifugal pump-in particular a spiral-casing centrifugal pump-for a heat carrier medium, comprising a spiral casing ( 14 ) having an impeller ( 40 ), a casing cover ( 18 ) and an associated casing attachment portion ( 34 ) for a pump shaft ( 35, 36, 36 <SUB>a</SUB>) provided with a shaft bearing ( 76, 76 <SUB>a</SUB>) near the spiral casing ( 14 ) and a shaft seal ( 56 ) disposed at a spacing in relation to the shaft bearing in a sealing chamber ( 48 ), parts of the casing cover ( 18 ) are a bearing cup ( 28 ) accommodating the shaft bearing ( 76, 76 <SUB>a</SUB>), a tubular portion ( 32 ) surrounding the pump shaft ( 35, 36, 36 <SUB>a</SUB>) as a heat barrier and support ribs ( 56 ) or the like profile elements arranged at a spacing relative to each other in the peripheral direction. The bearing cup ( 28 ) is held at an axial spacing towards the impeller ( 40 ) by the tubular portion ( 32 ) surrounding the pump shaft ( 35, 36, 36 <SUB>a</SUB>), and the casing attachment portion ( 34 ) attached to the casing cover ( 18 ) or an edge ring ( 30 ) carried by the support ribs ( 26 ) thereof delimits the sealing chamber ( 48 ) for the shaft seal ( 56 ).
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