Patent ID: 6570167
Filing Date: 2003-05-27
Classification: E21D,G01C,H01R,Y10S

Abstract:
An apparatus for treating a liquid, the apparatus comprising:a housing having: an internal passageway through which the liquid can flow, an outlet, and an inlet, the outlet and the inlet communicating with the internal passageway, a radiation emitter comprising an elongate tube within said internal passageway and between said outlet and said inlet, the elongate tube having an upper end and a lower end, a cleaning device moveable along and for periodic cleaning the elongate tube, the cleaning device being heavier than the liquid passing through the internal passageway such that the cleaning device will naturally fall under gravity from the upper end of the elongate tube to the lower end of the elongate tube, the cleaning device comprising: a body, a passageway extending through the body to define an internal wall of the body, the elongate tube passing through the passageway such that the cleaning device is slideable along the elongate tube, cleaning means provided on the internal wall of the body to clean the wall of the elongate tube, at least one liquid flow passage extending through the cleaning device, the liquid flow passage having a turbine surface which is angled relative to the flow of water through the internal passageway to impart a rotational force to the cleaning device as liquid flows through the flow passage.