ULTRAVIOLET IRRADIATION DEVICE AND WATER DISCHARGE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an ultraviolet irradiation device suppressing generation of water scale on the surface of an irradiation window: and to provide a water discharge device.SOLUTION: An ultraviolet irradiation device includes: a flow passage having a flow passage body and a pair of water passage ports mounted on the flow passage body, making water supplied from one of the pair of water passage ports flow to the flow passage body and discharging the water through another of the pair of water passage ports; and a light-emitting part irradiating the water flowing through the flow passage body with ultraviolet rays via the ultraviolet irradiation window. The ultraviolet irradiation window includes a surface in contact with the water flowing through the flow passage body. The flow passage includes a water storage part storing the water so as to come in contact with the surface of the ultraviolet irradiation window while allowing air between the pair of water passage ports to flow in a state that water is not supplied.SELECTED DRAWING: Figure 3