Claims
- 1. A UV ray irradiation apparatus for irradiating untreated water to sterilize bacteria, decompose organics by oxidation, decompose harmful substances and achieve other objectives, the apparatus comprising:
- a light transmission tube having an internal light irradiation lamp and a smooth layer of a resin material covering the outside circumferential surface of said tube;
- a scraper ring slidably and tightly fitted to the circumferential surface of said light transmission tube, said scraper ring having an internal cleaning solution chamber communicating with a chemical solution supply pipe; and
- a mechanism coupled to said scraper ring to cause the scraper ring to be reciprocally moved over the circumferential surface of said light transmission tube to wash said light transmission tube.
- 2. A UV ray irradiation apparatus as set out in claim 1, wherein a sealing material is fitted on the surface of said light transmission tube adjacent to said cleaning solution chamber.
- 3. A UV ray irradiation apparatus as set out in claim 2, wherein the sealing material is an O-ring.
- 4. A UV ray irradiation apparatus as set out in claim 1, wherein said scraper ring is reciprocally slid over the circumferential surface of said light transmission tube by connection said scraper ring with a moving frame which is fitted to a rotating screw stem installed externally to said light transmission tube, and normally and reversely rotated by a drive means.
- 5. A UV ray irradiation apparatus as set out in claim 4, wherein said drive means comprises a motor.
- 6. A UV ray irradiation apparatus as set out in claim 1, wherein the resin layer on the surface of the light transmission tube lamp is a fluorocarbon resin film deposited by a coating process on the outside surface of the tube.
- 7. A UV ray irradiation apparatus as set out in claim 1, wherein said scraper ring is composed of a copolymer resin of tetrafluoroethylene-perfluoroalkylvinyl ester.
- 8. A UV ray irradiation apparatus as set out in claim 1, wherein said layer of resin material has a thickness of from 0.3 to 0.5 mm.
- 9. A UV ray irradiation apparatus as set out in claim 1, wherein said layer of resin material is a tubular heat shrink fluorocarbon resin material.
- 10. A method of improving the UV irradiation efficiency of a UV irradiation apparatus having one or more UV ray transmission tubes having an outside circumferential surface and an inner UV lamp, comprising the steps of:
- providing a smooth layer of a resin material over said outside surface of said one or more UV ray transmission tubes; and
- reciprocating an annular cleaning member having an annular cleaning solution chamber containing a cleaning solution over said layer of resin material to remove deposits from said layer.
- 11. A method as set out in claim 10, wherein said step of providing a layer comprises heat shrinking a tubular sheath of a fluorocarbon resin material onto said UV transmission tube.
- 12. A method as set out in claim 10, wherein said step of providing a layer comprises depositing a film on the surface of said UV transmission tube.
- 13. A method as set out in claim 10, wherein said step of reciprocating said cleaning member is performed during irradiation operations by said UV lamps.
- 14. A method as set out in claim 10, wherein said step of providing a layer comprises providing a layer of fluorocarbon resin having a thickness of from 0.3 mm to 0.5 mm.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9-074622 |
Mar 1997 |
JPX |
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RELATED APPLICATION INFORMATION
The present application is a continuation-in-part of application Ser. No. 08/818,965 filed Mar. 14, 1997 now U.S. Pat. No. 5,874,740.
US Referenced Citations (13)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2-48092 |
Feb 1990 |
JPX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
818965 |
Mar 1997 |
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