New filter, filter unit, treatment apparatus, method and use
AssigneeXeros Limited
InventorsJoseph MATTLEY, James Richard PEASE, Thomas Andrew COBB, Gareth Evan Lyn JONES
Life of this patent
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Abstract
This invention relates to a filter which is especially for filtering microfibres which can, for example, originate from the washing of textiles. The filter is rotatable around an axis of rotation. The filter provides good filtering efficiency and improved resistance to blocking.
Claims38
A filter suitable for a filter unit, the filter being rotatable around an axis of rotation, the filter comprising:
- a) a first end, a second end and one or more side walls connecting the first end of the filter and the second end of the filter, wherein the first end, second end and one or more side walls of the filter define a filter chamber;
- b) an inlet located in the first end of the filter, wherein said inlet is configured to allow a feed to enter the filter chamber;
- c) a filter medium having a first surface, wherein the first surface is the surface through which the feed enters the filter medium and is filtered;
- and
- wherein at least requirements i) and iv) are met:
- i) at least a portion of said first surface is oriented such that when the filter is operating and rotating about the axis of rotation any solid material accumulating on said first surface is urged away from said first surface;
- ii) at least one of the side walls of the filter has perforations provided that no more than 50% of the surface area of said at least one side wall is occupied by said perforations;
- iii) the filter additionally comprises a flow path which is defined and constrained by one or more surfaces within the filter chamber, said flow path having at least a portion which is not coincident with the axis of rotation of the filter during operation nor is it radial with regard to the axis of rotation during operation;
- iv) the filter comprises a plurality of filter media, at least some of which are stacked in layers.
A filter according to any one of the preceding claims wherein said first surface is planar.
A filter according to any one of the preceding claims wherein the filter medium is planar.
A filter according to any one of the preceding claims wherein requirement ii) is additionally met.
A filter according to any one of the preceding claims comprising one or more regions where during operation of said filter, solid material present in the feed can accumulate on an interior surface of the one or more side walls.
A filter according to any one of the preceding claims wherein requirement iii) is additionally met.
A filter according to any one of the preceding claims wherein the filter media in the stacked layers are all of the same shape, preferably wherein the shapes are selected from those having a planar, corrugated, concave and convex shape.
A filter according to any one of the preceding claims comprising at least four filter media which are stacked in layers.
A filter according to any one of the preceding claims wherein the filter medium comprises perforations, optionally wherein said perforations have an average largest dimension of no more than 1 mm.
A filter according to any one of the preceding claims having a filter medium located in the first and/or second end of the filter, or having a further filter medium located in the first and/or second end of the filter.
A filter unit comprising a filter according to any one of the preceding claims.
Dependencies are inferred from the claim text.