Self-cleaning screen assembly for filtering irrigation water

摘要

A self-cleaning screen includes a rotatable drum made of mesh material and an inlet pipe extending through a front end of the drum. A flotation structure supports the drum with the inlet pipe and the lower part of the drum submerged during use. A cleaning spray system located within the drum receives cleaning water through a hollow shaft supporting a rear end of the drum. Spray nozzles located within an upper part of the drum above the water level direct the cleaning water radially outward to dislodge debris from the screen. The front end of the drum includes an annular ring and a rubber seal extending radially inwardly from the annular ring to engage the inlet pipe. A drive belt extends around the annular ring to rotate the drum. A plurality of rollers engage a surface of the annular ring to support the drum for rotation about a horizontal axis.

主权项

1. A self-cleaning screen assembly, comprising:
a rotatable drum comprising a screen for removing debris from water as the water passes into the drum, said rotatable drum having a front end and a rear end, and said screen extending between said front and rear ends; an inlet pipe that passes through said front end of the rotatable drum, said inlet pipe having at least one inlet opening for receiving screened water from within the drum; a support structure for rotatably supporting said rear end of the rotatable drum, said support structure comprising a bearing mounted to said rear end of the rotatable drum, and a hollow shaft that passes through said bearing and supports said rear end of the rotatable drum for rotation about an axis of said hollow shaft; and a cleaning spray system positioned within said rotatable drum, said cleaning spray system comprising at least one spray nozzle located within said drum directed to spray water in a radially outward direction to dislodge debris stuck to the screen, said cleaning spray system being connected to said hollow shaft so that cleaning water can be passed through said hollow shaft and said bearing into said rotatable drum to clean said screen; further comprising a seal means provided between said front end of the rotatable drum and an outer surface of said inlet pipe for preventing unscreened water and debris from passing into the drum; wherein said front end of the drum comprises an end face, an annular ring protruding in an axial direction from an inner periphery of said end face, said annular ring being coaxial with an axis of rotation of the drum; and further comprising a support structure for rotatably supporting said front end of the rotatable drum, said support structure comprising a plurality of rollers that engage and support a surface of said annular ring to allow said drum to rotate about a horizontal axis while being supported by said rollers.