| 摘要 |
An apparatus for scavenging condensate from the interior of a cylinder, such as a drying cylinder of a papermaking machine, which is heated by means of condensable medium. The apparatus comprises a siphon arranged in the cylinder and forming a mainly radial passage. One end of the passage opens in the vicinity of the inner circumferential surface of the cylinder while the other end of the passage is in communication with a condensate scavenging pipe which extends along the cylinder axis and is in communication with a region outside the cylinder to scavenge condensate from the interior of the cylinder. The passage formed by the siphon is composed of a plurality of parallel and mutually delimited part passages. A pressure difference sensing means is arranged in the cylinder to sense the difference between the pressure in the cylinder and respectively a pressure depending upon the pressure drop in the siphon and a preset reference pressure. A control means is disposed in the cylinder to control the size of the cross-sectional area of the passage by blocking a number of part passages which is dependent upon the pressure difference sensed by the pressure difference sensing means, and is connected to the pressure difference sensing means so that it enlarges the cross-sectional area of the passage at a pressure increase in the cylinder and/or a pressure drop increase in the siphon, and reduces the cross-sectional area of the passage at a pressure decrease in the cylinder and/or a pressure drop decrease in the siphon.
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