Water purification device
AssigneeTakara Kogyo Co., Ltd.
InventorYoshihiko Ueda
Life of this patent
Estimating the term…
Abstract
In a water purification apparatus in which a granular filter medium is washed by agitation imparted to the filter medium, a pipe adapted for collection of purified water is mounted within the heap of precipitated granular filter medium and enclosed by a filter mesh to prevent outflow of the filter medium. Sliding contact elements such as turns of a wire wound about the collecting pipe or linear brush-like members inserted on the collecting pipe are also provided between the pipe and the filter mesh so that both the inner and outer surfaces of the filter mesh may be cleaned during countercurrent washing of the filter medium for assuring optimum water permeation at all times.
Claims5
A water purification apparatus in which a granular filter medium filters water to be filtered, comprising:
- a tank;
- means for providing water to be filtered into said tank;
- water collection means, disposed in said tank beneath the granular filter medium, for collecting water filtered in the granular filter medium;
- washing means, independent of said collection means, for injecting and removing washing water from said tank so as to agitate and wash the granular filter medium therein;
- a filter mesh loosely enclosing said water collection means so as to be movable thereover in response to contact with moving particles of the granular filter medium agitated by washing water during washing of the granular filter medium by said washing means;
- sliding contact means, interposed between said water collection means and said filter mesh, for slidingly contacting said filter mesh when said filter mesh moves during washing of the granular filter medium by said washing means, so as to disengage matter adhered to the inner and outer surfaces of said filter mesh.
Dependencies are inferred from the claim text.