FIELD OF THE INVENTION

The invention relates to the field of filtration systems.

BACKGROUND

A drum-type filter assembly typically includes a drum-like housing, having therein a filtering system comprising one or more substantially round parallel filtering arrays. Each array is substantially shaped as a disc and is comprised of one or more sectors, each of which may be shaped like a segment having a wide end and a truncated corner, thus forming a narrow end. Typically, the sectors are connected at their narrow end to a pipe, or form such pipe, which constitutes the outlet of the filter.

Thus, the liquid flows into the filter from the perimeter of the discs and out through the pipe formed around the center of the filtering discs.

This model suffers from a number of drawbacks including high footprint, i.e. low throughput relatively to the size of the filter assembly. Thus there is a need in the art for an advanced filtering system that overcomes the advantages of prior art systems.

The foregoing examples of the related art and limitations related therewith are intended to be illustrative and not exclusive. Other limitations of the related art will become apparent to those of skill in the art upon a reading of the specification and a study of the figures.

SUMMARY

The following embodiments and aspects thereof are described and illustrated in conjunction with systems, tools and methods which are meant to be exemplary and illustrative, not limiting in scope.

One exemplary embodiment of the disclosed subject matter is a filter for filtering liquid, comprising: a cylindrical housing; and a multiplicity of discs positioned perpendicularly to a height of the cylindrical housing, each of the multiplicity of discs comprised of a first number of cassettes, wherein each cassette is shaped as a truncated sector, having a wide end and a narrow end, the cassettes arranged such that a perimeter of the disc is formed by the wide end of the first number of cassettes, and wherein each of the first number of cassettes is connected to the housing at its wide end, and each cassette having an opening along the wide end, wherein during filtration, liquid being filtered flows over the multiplicity of discs towards the perimeter of the multiplicity of discs.

Within the filter, the multiplicity of discs are optionally static during liquid filtration and during rinsing of the system.

Within the filter, each cassette optionally comprises an opening at its wide end and wherein filtered liquid flows out of the system through the opening.

Within the filter, openings of corresponding cassettes comprised in neighboring discs are optionally connected to form a pipe, thus forming a number of pipes equal to the first number through which the filtered liquid flows out of the system.

Within the filter, each cassette optionally comprises a board having a multiplicity of supports thereon, and each cassette is wrapped by thread forming loops around the cassette.

Within the filter, the liquid to be filtered optionally flows into the cassette and out of the cassette perpendicularly to the discs, and flows within the filter in parallel to the discs.

Within the filter, each cassette optionally comprises a board having a multiplicity of supports thereon, and each cassette is wrapped by thread forming thread loops around the cassette, and wherein the liquid to be filtered flows into the filter and out of the filter perpendicularly to the discs, and flows within the filter in parallel to the discs such that particles to be filtered out get caught between the thread loops.

The filter can further comprise a rinsing system, comprising a multiplicity of nozzles connected to a common pipe, each nozzle located between two adjacent filtering discs.

Within the filter, an end of each of the multiplicity of nozzles is optionally moved over substantially an entire area of the two adjacent filtering layers.

Within the filter, the common pipe is optionally moved by a planetary gear.

Within the filter, the end of each of the multiplicity of nozzles is optionally rotated in a spiral motion over the two adjacent filtering discs.

Within the filter, the spiral motion is optionally created by two motors.

Within the filter, the two motors optionally have different rotation speeds.

Within the filter, the spiral motion is created by two cogwheels rotated at different angular velocities.

Within the filter, the multiplicity of nozzles are optionally moved by a mechanism external to the cylindrical housing.

In addition to the exemplary aspects and embodiments described above, further aspects and embodiments will become apparent by reference to the figures and by study of the following detailed description.

