Ultraviolet irradiation water treatment apparatus

Abstract

An ultraviolet irradiation water treatment apparatus includes a vessel having a cylindrical side portion, and plural rod-shaped ultraviolet lamps are disposed in parallel with a central axis of the side portion in the vessel. A water inlet pipe through which water flows into the vessel is provided in an outer wall of the side portion at a position in a tangential direction of an inner periphery of the side portion.

1 . An ultraviolet irradiation water treatment apparatus comprising:
 a vessel comprising a water inlet pipe, an inflow portion which has a cylindrical outer wall and a cylindrical inner wall, the water inlet pipe being provided at the side portion while the inner wall and a part of the outer wall are communicated such that a water is flowed into the vessel in a tangential direction of the inner wall, a reversely truncated conical tapered portion which is provided at a lower end of the inflow portion, a cylindrical side portion which is provided below the tapered portion, the side portion having an inner diameter portion identical to an inner diameter at the lower end of the tapered portion, a reversely truncated conical discharge portion which is provided at the lower end of the side portion, a lid which closes an upper end of the side portion, and a water outlet pipe which is provided on a central axis of the inflow portion;   rod-shaped ultraviolet lamps which are provided in the vessel and disposed in the lid along a central axis of the side portion; and   protective tubes which respectively surround the ultraviolet lamps.   
     
     
         2 . The ultraviolet irradiation water treatment apparatus according to  claim 1 , wherein the ultraviolet lamps are disposed in the lid at equal intervals on a circumference around the central axis. 
     
     
         3 . The ultraviolet irradiation water treatment apparatus according to  claim 1 , wherein the vessel includes:
 a cylindrical connection portion which is located at a lower end of the discharge portion, the connection portion having an inner diameter identical to an inner diameter at the lower end of the discharge portion; and   a contaminant trap container which accumulates the water discharged from the connection portion and a contaminant contained in the water, the connection portion being inserted into the contaminant trap container.   
     
     
         4 . The ultraviolet irradiation water treatment apparatus according to  claim 1 , wherein the vessel includes a reversely truncated conical side portion instead of the cylindrical side portion. 
     
     
         5 . The ultraviolet irradiation water treatment apparatus according to  claim 1 , wherein a lower end of the water outlet pipe is located above a lower end of ultraviolet lamps. 
     
     
         6 . The ultraviolet irradiation water treatment apparatus according to  claim 1 , wherein a lower end of the water outlet pipe is located at a substantially half height position of ultraviolet lamps. 
     
     
         7 . The ultraviolet irradiation water treatment apparatus according to  claim 1 , wherein the inflow portion further includes a plurality of cover components which are disposed in the lid so as to respectively surround protective tubes. 
     
     
         8 . The ultraviolet irradiation water treatment apparatus according to  claim 1 , wherein an inner wall of the inflow portion further includes a downward spiral first guide fin. 
     
     
         9 . The ultraviolet irradiation water treatment apparatus according to  claim 1 , wherein the inflow portion further includes a cylindrical cover skirt which is disposed below the lid so as to surround all of said protective tubes. 
     
     
         10 . The ultraviolet irradiation water treatment apparatus according to  claim 1 , wherein the lid includes a recess portion which is recessed in a cylindrical shape so as to push down all of said ultraviolet lamps. 
     
     
         11 . The ultraviolet irradiation water treatment apparatus according to  claim 1 , comprising:
 a cylindrical outflow portion which is provided below the lid in a watertight manner, a bottom surface of the outflow portion being coupled to the water outlet pipe; and   a water discharge pipe which is provided in an outer wall of the outflow portion while piercing through the inflow portion, the water discharge pipe discharging treated water from the water outlet pipe.   
     
     
         12 . The ultraviolet irradiation water treatment apparatus according to  claim 9 , wherein an outer wall of the cover skirt further includes a downward spiral second guide fin. 
     
     
         13 . The ultraviolet irradiation water treatment apparatus according to  claim 10 , wherein an outer wall of the recess portion further includes a downward spiral second guide fin. 
     
     
         14 . The ultraviolet irradiation water treatment apparatus according to  claim 12 , wherein an angle of lead of the first guide fin is larger than an angle of lead of the second guide fin.