| 摘要 |
A concentric multi-shaft assembly ( 1 ) comprises a casing ( 2 ), a hollow outer shaft ( 3 ) that is freely rotatable in the casing, an inner shaft ( 4 ) that is freely rotatable in the outer shaft ( 3 ) and independently of the outer shaft, an outer shaft seal arrangement ( 16, 19, 20, 21 ) sealing between the casing and the outer shaft and an inner shaft seal arrangement ( 24, 25, 27, 28 ) sealing between the outer shaft and the inner shaft. The outer shaft seal arrangement includes a spring seat ( 6 ) supported by the casing ( 2 ) such that it does not rotate when, in use, the outer shaft rotates. The inner shaft seal arrangement comprises a spring seat ( 8 ) that is supported by the inner shaft such that it is rotatable with the inner shaft. The spring seat ( 6 ) of the outer shaft seal arrangement is arranged to divide an outer seal chamber defined between the outer shaft and the casing into two parts ( 10, 11 ), a first of the two parts being a feed chamber ( 10 ) arranged to receive coolant via a feed inlet ( 12 ) and a second of the two parts being a discharge chamber ( 11 ) from which, in use, coolant is discharged from the assembly ( 1 ) via a discharge outlet ( 13 ). An inner seal chamber ( 14 ) is defined between the inner shaft and the outer shaft. A feed hole ( 15 ) and discharge hole ( 16 ) extend between the feed chamber ( 10 ) and the inner seal chamber and between the discharge chamber ( 11 ) and the inner seal chamber respectively. The arrangement is such that coolant from an external source can flow into the feed chamber ( 10 ) via the feed inlet ( 12 ), from the feed chamber into the inner seal chamber ( 14 ) via the feed hole ( 15 ), from the inner seal chamber into the discharge chamber ( 11 ) via the discharge hole ( 16 ) and from the discharge chamber via the discharge outlet ( 13 ).
|
