Filter media retainer assembly

摘要

A filter system for filtering particles from a liquid includes an underdrain assembly having an underdrain defining at least one underdrain chamber and a media retainer assembly. The media retainer assembly includes an upper filter media retainer plate defining a plurality of hopper-shaped cavities and a lower filter media retainer plate defining a plurality of hopper-shaped cavities corresponding to the plurality of hopper-shaped cavities on the upper plate. The plates are in a nested arrangement such that the hopper-shaped cavities on the upper plate are in alignment with the corresponding plurality of hopper-shaped cavities on the lower plate to define a plurality of passages therebetween and allow for the passage of the liquid while preventing the passage of a filter media. During a backwash operation, the upper and lower plates are relatively moveable such that the backwash fluid releases any particles lodged in the passages between the plates.

主权项

1. A filter system for filtering particles from a liquid containing the particles, the filter system comprising:
an underdrain assembly having an underdrain wall defining at least one underdrain chamber; a media retainer assembly, the media retainer assembly including an upper filter media retainer plate defining a plurality of hopper-shaped cavities that face in an upward direction, and a lower filter media retainer plate defining a plurality of hopper-shaped cavities that face in a downward direction, wherein the plurality of hopper-shaped cavities on the upper filter media retainer plate are vertically aligned with the plurality of hopper-shaped cavities on the lower filter media retainer plate, wherein the cavities of the upper retainer plate have a pair of first walls defining a first slot therebetween, wherein the cavities of the lower retainer plate have a pair of first walls defining a second slot therebetween, and wherein the first slots of the upper retainer plate are offset from the second slots in the lower retainer plate so that the first walls of the upper retainer plate are received within the respective second slots of the lower retainer plate and so that first walls of the lower retainer plate are received within the first slots of the upper retainer plate to define a plurality of first passages between adjacent edges of the first walls of the upper and lower retainer plates, wherein each of the first passages is sized to allow for the passage of the liquid and to prevent the passage of a filter media, and wherein the upper filter media retainer plate is relatively flexible in relation movable relative to the lower filter media retainer plate; and wherein the filter media has a plurality of filter media particles disposed on the upper filter media retainer plate, the filter media adapted to capture the particles from the liquid as the liquid passes through the plurality of passages to the underdrain chamber.