Patent ID: 7253536
Filing Date: 2007-08-07
Classification: E03D,F03B,F05B,Y02B,Y02E

Abstract:
1. A water supply apparatus in which an apparatus body is disposed in a midst of a flow passage for supplying water to an indoor facility and a power generating unit is installed in the apparatus body, the power generating unit comprising; a rotating shaft extended in the direction perpendicular to the water flow direction of the flow passage; an impeller mounted on the rotating shaft and rotated by a water flow; a holder having a cylindrical portion with an arcuate cross section along the impeller and having a shaft support portion which supports a proximal end portion of the rotary shaft on a distal end portion of the cylindrical portion; a magnet rotated interlockingly with the impeller; and a coil arranged to face the magnet in an opposed manner wherein the holder in the power generating unit is mounted on a peripheral surface of an opening portion formed in the apparatus body in a state that the shaft support portion is inserted into the inside of the flow passage from the opening portion, the impeller forms blades in the outward radial direction and forms clearances allowing water to pass the inside of the blades; a clearance is formed between outer peripheries of the blades and an inner wall of the flow passage, and the clearance is set larger than a clearance between the outer peripheries of the blades and the cylindrical portion for forming a flow passage which does not receive a pressure loss attributed to the impeller.