| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a low-pressure mercury lamp for a water treatment device in which ultra-violet illuminance is maintained without fluctuations within a treated water temperature range from 10°C to 30°C, and any water temperature within this range is adaptable by one kind lamp. <P>SOLUTION: In the low-pressure mercury lamp for the water treatment device which is equipped with a straight tubular arc tube made of silica glass wherein an amalgam of more than one kind of metal out of bismuth, indium and tin, and mercury is sealed inside, and a lamp base is mounted on the outer circumference of both end parts having a sealing structure, and in which the arc tube is placed and used on the inside bottom face of a straight tubular silica lamp sleeve horizontally arranged in the treated water, a recessed part in which the amalgam is fixed at least to one of the both end parts of the inner face of the arc tube, and which is opened toward inside the arc tube is formed out of a discharge space regulated by an inside space between the both electrode tips, and the lamp base has a non-cylindrical shape and a structure to regulate so that the recessed part is always positioned at a lower part of the inner face of the arc tube and takes a posture to be opened upward. <P>COPYRIGHT: (C)2011,JPO&INPIT |
