| 摘要 |
Disclosed is a method of operating a centrifugal compressor (1), in which a working medium is induced by a compressor impeller (6) arranged in a compressor casing (5) and equipped with a number of impeller vanes (7), is compressed and is led on to a consumption unit as a main flow (28). After the compression process, which takes place between the impeller vanes (7), a leakage flow (29) of the working medium (27) branches off and this leakage flow (29) flows into a separating gap (18) formed between the compressor impeller (6) and the compressor casing (5). The separating gap (18) is not sealed against the penetration of the leakage flow (29) of the working medium (27) in the region of a rear wall (16) of the compressor impeller (6), wherein a cooling medium (25) is introduced into the separating gap (18) downstream of the leakage flow (29) of the working medium (27) and this cooling medium (25) is finally removed again after the cooling process has taken place. In the present invention there is also claimed a centrifugal compressor (1) having, among others, at least one supply duct (24) for a gaseous cooling medium (25), said duct (24) penetrating the compressor casing (5), opening into the separating gap (18) in the region of the rear wall (16) of the compressor impeller (6) and directed onto the rear wall (16), and at least one exhaust duct (26) for the cooling medium (25), wherein said ducts (24, 26) are arranged in the compressor casing (5). |
