Boll & Kirch Filterbau Gmbh

Firma Boll & Kirch, Filterbau Gmbh

Boll & Kirch Filterbau Gesellschaft MIT Beschränkter Haftung

Willi Rott

Rudiger Lennartz

Andreas Finsel

Heinz Sindorf

Karsten Cartarius

Sivagnanam Kandiah

Wilhelm Vieten

Rüdiger Lennartz

Heinz Heinrich Leonhard Sindorf

A backflush filter for liquid media, having a filter housing, which is formed by means of at least one supporting cage, which has at least two groups of slot-type apertures, and at least one filtering means supported on the supporting cage, where-in the apertures of each group extend in parallel alignment with one another and are separated from one another by ribs, and having a backflushing device, which is arranged in the interior of the filter insert, is rotatable and has at least one slit, said backflushing device being designed for flushing of the filtering means via the slit and apertures. The direction of motion of the backflushing device can be reversed during the backflush cycle and a filter insert therefore, wherein the backflush filter and the filter insert include a filtering means having a pleated, preferably multi-ply, filter fabric or filter cloth with pleating folds, and the ribs fit by means of a rib front into respective pleating folds.

Backflush filter and filter insert for the latter

A backflush filter for liquid media, having a filter housing formed by supporting cage(s) having at least two groups of apertures, and a filtering means supported on the supporting cage, the apertures of each group extend in parallel and are separated by ribs, and having a backflushing device arranged in the interior of the filter insert, is rotatable and has a slit, the backflushing device for flushing the filtering means via the slit and apertures, the direction of the backflushing device being reversible during the backflush cycle, the backflushing device having at least two separated flushing chambers having a corresponding slit, and also a hollow shaft, capable of limited rotary motion relative to the flushing chambers, which shaft having first and second radial outlets, the direction of the backflushing device being reversible during backflushing, and driving means for movement of the flushing chambers and the hollow shaft, are provided for both directions of motion.

Backflushing filter and filter insert for the same

In the backflush filter () according to the invention, in which the flushing back of the filter inserts () which are received in several filter chambers takes place by means of flushing filtrate loaded by compressed air, the flush valve () and the mud drain valve () are actuated by a common drive, whereas the valves or the valve bores () are dimensioned in such a manner that the flush valve only releases the connection to the filtrate chamber (') of the filter inserts (&#x2032;) to be flushed back, when the mud drain valve has already at least partially released the connection between the mud chamber (&#x2032;) of the affected filter chamber (&#x2032;) with a mud outlet (). By this, it is ensured in a particularly simple manner that at the backflush process the pressure level in the mud chamber has already dropped before the filtrate for the backflush is loaded with compressed air (see FIG.).

Back-wash filter

A backflushing filter for filtering oil includes filter candleswhich are open at both endsand disposed around a rotary shaftin a filter housing. A cleaning device is moved in conjunction with the rotary shaft and includes upper and lower flushing cocks communicating with an outflow valve via the shaft for cleaning the candles during a backflushing operation. The upper flushing cockis offset by an angle in the direction of rotation in relation to the lower flushing cockA lower closure elementmoves in conjunction with the upper flushing cock at the opposite end of a filter candle(s) selected for backflushing. Likewise, an upper closure element is associated with the lower flushing cock. The candles can be reverse-flushed in opposite directions and at different times by the flushing cocks and closure elements. The flushing cocks and closure elements are moved inside annular deflection hoods

Backflush filter, in particular for filtering lubricant oil

The flush-back filter according to the invention uses as supporting element for at least one filter element a support cage which is arranged firmly on the inside of the filter housing and is penetrated from the interior to the exterior by the medium to be filtered. At the interior of the support cage a lifting or rotating flush-back device is located which upon its movement passes over the slot-type windows of the support cage in succession. The slot-type windows are arranged on the support cage in several groups in such a way that the windows of the one group are offset against those of the other group(s) in the direction of movement of the flush-back device, in such a way that the windows of the one group lie at least with the webs of another group on a common plane. In this way the entire filter area is subjected to the flush-back operation during this operation only over very small surface areas, with the result that small flush-back volumes can be used and the pressure drop is slight.

Growing community of inventors

Bornheim, Germany

Willi Rott