Fluid sterilization device

Abstract

An aspect is to provide a fluid sterilization device that appropriately causes ultraviolet light emitted from a light source (light emitting element) to enter a flow path pipe to enhance sterilizing ability. The fluid sterilization device can include a cylindrical flow path pipe having a side peripheral wall, and a light source unit including a light emitting element disposed on the side peripheral wall and a substrate on which the light emitting element is mounted, wherein a notched region along a longitudinal direction of the flow path pipe is formed in the side peripheral wall of the flow path pipe, and the light source unit is housed in the notched region. The fluid sterilization device preferably further includes a heat sink that is disposed at a more radially outward position relative to the substrate of the light source unit and that is in contact with an outer surface of the substrate, and a housing that houses the heat sink. The flow path pipe preferably has a through hole at a position in the notched region where the light emitting element faces the notched region, and the fluid sterilization device preferably further includes: an ultraviolet light-transmitting window portion provided in the through hole; and an annular reflector that is housed in the notched region to surround the light emitting element.

Dependencies are inferred from the claim text.