| 摘要 |
A vacuum band filter comprises a continuously moving filter band having lower and upper runs with the upper run of the band forming a trough to which is fed the liquid to be filtered, and a vacuum exhaust and liquid collecting chamber disposed below and in liquid-tight engagement with the upper run of the filter band. The section of the band subjected to the vacuum action is divided into filtration and drying zones, and possibly one or more rinsing zones therebetween, with intermixing of the liquids of adjacent zones being prevented by passing the portions of the band intervening between adjacent zones above the preceding liquid level in the filter trough. More particularly, the band, in passing from the filtration zone to a rinsing zone, or in passing from a first rinsing zone to a second rinsing zone, is led roof-fashion above the liquid level, and the band, in passing from the filtration or rinsing zone to the final drying zone, has the end of the trough-shaped section extended upwardly from the liquid level. Preferably, each of the zones has its independent vacuum compartment fitted with individual means to control the degree of the vacuum and to separately discharge the different liquids collected.
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