ULTRAVIOLET LIGHT IRRADIATION DEVICE

• US 20190322546A1
• Filed: 04/12/2019
• Published: 10/24/2019
• Est. Priority Date: 04/20/2018
• Status: Active Grant

• Current Assignee: Asahi Kasei Kabushiki Kaisha (Asahi Kasei Corporation)
• Original Assignee: Asahi Kasei Kabushiki Kaisha (Asahi Kasei Corporation)
• Inventors: SUGIYAMA, Sho, KODAMA, Atsushi, YABUKI, Naoto, KISHI, Hiroyuki, ITO, Naoto, JINNO, Sumire
• Granted Patent: US 10,730,764 B2
• Time in Patent Office: Days
• CPC Class Codes: A61L 2/10 Ultraviolet radiation
• CPC Class Codes: A61L 2202/11 Apparatus for generating biocidal substances, e.g. vaporisers, UV lamps
• CPC Class Codes: C02F 1/325 Irradiation devices or lamp constructions
• CPC Class Codes: C02F 2201/3222 Units using UV-light emitting diodes [LED]
• CPC Class Codes: C02F 2201/3228 Units having reflectors, e.g. coatings, baffles, plates, mirrors
• CPC Class Codes: C02F 2201/328 Having flow diverters (baffles)

Abstract

A fluid sterilization module includes an inner cylinder forming a processing flow path, a case portion in which the inner cylinder is accommodated, a member provided between an outer circumferential surface of the inner cylinder and an inner circumferential surface the case portion, a first chamber located in a region on a side of one end portion of the inner cylinder with respect to the member, in a gap between the inner cylinder and the case portion, a second chamber located in a region on a side of the other end portion of the inner cylinder with respect to the member, and a light emitting element provided in at least one of the one end portion and the other end portion of the inner cylinder, and configured to emit ultraviolet light to the object passing through the processing flow path.

Claims

1. An ultraviolet light irradiation device comprising:

a cylindrical portion forming a cylindrical processing flow path extending in a longitudinal direction;

a case portion in which the cylindrical portion is accommodated;

a member of an annular shape, provided in close contact between an outer circumferential surface of the cylindrical portion and an inner circumferential surface the case portion, and including an elastic member at least in a portion in contact with the inner circumferential surface of the case portion;

a first chamber located in a region on a side of one end portion of the cylindrical portion with respect to the member, in a cylindrical gap between the cylindrical portion and the case portion;

a second chamber located in a region on a side of the other end portion of the cylindrical portion with respect to the member, in the cylindrical gap between the cylindrical portion and the case portion;

an inflow portion through which an object flows into the first chamber;

an outflow portion through which the object flows out of the second chamber; and

a light emitting element provided at least in one of the one end portion and the other end portion of the cylindrical portion, and configured to emit ultraviolet light to the object passing through the processing flow path.

2. The ultraviolet light irradiation device according to claim 1,

wherein the member includes an elastic member provided between the outer circumferential surface of the cylindrical portion and the inner circumferential surface of the case portion.

3. The ultraviolet light irradiation device according to claim 1,

wherein the member is formed integrally with the cylindrical portion on the outer circumferential surface of the cylindrical portion, and an annular elastic member is provided on an outer circumferential surface of the member.

4. The ultraviolet light irradiation device according to claim 1, further comprising a communication port provided in the cylindrical portion to communicate between the processing flow path and the second chamber,

wherein the object in the processing flow path flows out to the second chamber, only through the communication port.

5. The ultraviolet light irradiation device according to claim 1,

wherein the outer circumferential surface of the cylindrical portion is lower in static friction coefficient, than the inner circumferential surface of the case portion.

6. The ultraviolet light irradiation device according to claim 5,

wherein the static friction coefficient of the outer circumferential surface of the cylindrical portion equal to or lower than ½

of the static friction coefficient of the inner circumferential surface of the case portion.

11. The ultraviolet light irradiation device according to claim 1,

wherein a variation range of a main cross-sectional area of the processing flow path from a most upstream portion to a most downstream portion is equal to or lower than 5%.

12. The ultraviolet light irradiation device according to claim 1,

wherein, in a cross-section orthogonal to the longitudinal direction at a position in the cylindrical portion including the first chamber, a cross-sectional area of the first chamber is equal to or larger than 1/10, and equal to or smaller than 1, of a cross-sectional area of the processing flow path.

13. The ultraviolet light irradiation device according to claim 1,

wherein the cylindrical portion includes an ultraviolet light reflecting material having a diffuse transmittance equal to or higher than 1[%]/1 [mm], and equal to or lower than 20[%]/1 [mm], and a total reflectance in an ultraviolet light region equal to or higher than 80[%]/1 [mm], and equal to or lower than 99[%]/1 [mm].

14. The ultraviolet light irradiation device according to claim 13,

wherein a sum of the diffuse transmittance and total reflectance in the ultraviolet light region is equal to or larger than 90[%]/1 [mm].

15. The ultraviolet light irradiation device according to claim 13,

wherein the ultraviolet light reflecting material includes at least one of polytetrafluoroethylene, a silicone resin, quartz glass containing an air bubble equal to or larger than 0.05 [μ

m] and equal to or smaller than 10 [μ

m], partially crystallized quartz glass containing crystallized particles equal to or larger than 0.05 [μ

m] and equal to or smaller than 10 [μ

m], an alumina sintered compact including crystallized particles equal to or larger than 0.05 [μ

m] and equal to or smaller than 10 [μ

m], and a mullite sintered compact including crystallized particles equal to or larger than 0.05 [μ

m] and equal to or smaller than 10 [μ

m].

16. The ultraviolet light irradiation device according to claim 1,

wherein a wall thickness of the cylindrical portion is equal to or thicker than 1 [mm], and equal to or thinner than 20 [mm].

17. The ultraviolet light irradiation device according to claim 1, configured as a fluid sterilization module.

18. The ultraviolet light irradiation device according to claim 1,

wherein the inflow portion includes polyolefin.

19. The ultraviolet light irradiation device according to claim 1,

wherein the object includes a liquid.

7. An ultraviolet light irradiation device comprising:

a cylindrical portion forming a cylindrical processing flow path extending in a longitudinal direction, and having an opening in one end portion;

a first chamber communicating with the processing flow path via the opening;

an inflow portion through which an object flows into the first chamber;

a second chamber provided along an outer circumferential surface of the other end portion of the cylindrical portion;

a communication port provided in the cylindrical portion, to communicate between the processing flow path and the second chamber;

an outflow portion through which the object that has passed through the processing flow path flows out from the other end portion of the cylindrical portion; and

a light emitting element provided at least in one of the one end portion and the other end portion of the cylindrical portion, and configured to emit ultraviolet light to the object passing through the processing flow path,

wherein the object in the processing flow path flows into the second chamber, only through the communication port.

8. The ultraviolet light irradiation device according to claim 7,

wherein the cylindrical portion includes a member located at an end face of the other end portion, and configured to cover an entirety of an opening in the other end portion, and

the member and the end portion of the cylindrical portion are joined to each other via an elastic member.

9. The ultraviolet light irradiation device according to claim 8,

wherein the elastic member includes an elastomer.

10. The ultraviolet light irradiation device according to claim 8,

wherein the elastic member includes one of a silicone resin elastomer and a fluororesin elastomer.