Irradiation chamber for liquid purification apparatus, purification apparatus and beverage dispenser

1. An irradiation chamber for a liquid purification apparatus using ultraviolet light irradiation against reproduction of pathogenic microorganisms, the irradiation chamber comprising an inlet portion, an outlet portion, and a main portion having an elongated shape comprising a cylindrical part having a volume of 200 mL or less, the main portion connected to the inlet portion and the outlet portion by smoothly curved connecting portions each composed of curved surfaces having a curvature radius greater than or equal to a radius of the cylindrical part and greater than or equal to 0.5 cm, the irradiation chamber having an internal surface defining a cavity, the irradiation chamber comprising an ultraviolet light emitting member configured to irradiate a liquid in the irradiation chamber with ultraviolet light, the main portion having a shape enlarged compared to the inlet portion, and the internal surface of the irradiation chamber defining the cavity is a three dimensional rounded surface having no edge which forms a recess.

2. The irradiation chamber according to claim 1 , wherein the internal surface of the irradiation chamber defining the cavity is a surface of revolution whose generatrix is a portion of a curve having no cusp all along the portion of the curve.

3. The irradiation chamber according to claim 1 , wherein the main portion of the irradiation chamber has a length between 5 cm and 15 cm inclusive.

4. The irradiation chamber according to claim 1 , wherein the main portion of the irradiation chamber has an internal constant cross section having a surface area between 0.5 cm 2 and 4 cm 2 inclusive.

5. The irradiation chamber according to claim 1 , wherein the outlet portion is collinear to the inlet portion.

6. The irradiation chamber according to claim 1 , wherein the outlet portion is substantially orthogonal with the inlet portion.

7. The irradiation chamber according to claim 1 , wherein the ultraviolet light emitting member comprises ultraviolet light emitting diodes.

8. The irradiation chamber according to claim 1 , wherein the ultraviolet light emitting member comprises optical fiber portions which are connected to at least one ultraviolet light source and which are configured to transmit ultraviolet light from said at least one source into the irradiation chamber.

9. A liquid purification apparatus comprising an irradiation chamber using ultraviolet light irradiation against the reproduction of pathogenic microorganisms, the irradiation chamber comprising an inlet portion, an outlet portion, and a main portion having an elongated shape comprising a cylindrical part having a volume of 200 mL or less, the main portion connected to the inlet portion and the outlet portion by smoothly curved connecting portions each composed of curved surfaces having a curvature radius greater than or equal to a radius of the cylindrical part and greater than or equal to 0.5 cm, the irradiation chamber having an internal surface defining a cavity, the irradiation chamber comprising an ultraviolet light emitting member configured to irradiate a liquid in the irradiation chamber with ultraviolet light, the main portion having a shape enlarged compared to the inlet portion, and the internal surface of the irradiation chamber defining the cavity is a three dimensional rounded surface having no edge which forms a recess.

10. The liquid purification apparatus according to claim 9 , wherein the internal surface of the irradiation chamber defining the cavity is a surface of revolution whose generatrix is a portion of a curve having no cusp all along the portion of the curve.

11. The liquid purification apparatus according to claim 9 , wherein the main portion of the irradiation chamber has a length between 5 cm and 15 cm inclusive.

12. The liquid purification apparatus according to claim 9 , wherein the main portion of the irradiation chamber has an internal constant cross section having a surface area between 0.5 cm 2 and 4 cm 2 inclusive.

13. The liquid purification apparatus according to claim 9 , wherein the outlet portion is collinear to the inlet portion.

14. The liquid purification apparatus according to claim 9 , wherein the ultraviolet light emitting member comprises ultraviolet light emitting diodes.

15. A beverage dispenser comprising a liquid purification apparatus comprising an irradiation chamber using ultraviolet light irradiation against the reproduction of pathogenic microorganisms, the irradiation chamber comprising an inlet portion, an outlet portion, and a main portion having an elongated shape comprising a cylindrical part having a volume of 200 mL or less, the main portion connected to the inlet portion and the outlet portion by smoothly curved connecting portions each composed of curved surfaces having a curvature radius greater than or equal to a radius of the cylindrical part and greater than or equal to 0.5 cm, the irradiation chamber having an internal surface defining a cavity, the irradiation chamber comprising an ultraviolet light emitting member configured to irradiate a liquid in the irradiation chamber with ultraviolet light, the main portion having a shape enlarged compared to the inlet portion, and the internal surface of the irradiation chamber defining the cavity is a three dimensional rounded surface, having no edge which forms a recess, the main portion configured to purify a beverage by ultraviolet irradiation before delivery of the beverage.

16. The beverage dispenser according to claim 15 , wherein the internal surface of the irradiation chamber defining the cavity is a surface of revolution whose generatrix is a portion of a curve having no cusp all along the portion of the curve.

17. The beverage dispenser according to claim 15 , wherein the main portion of the irradiation chamber has a length between 5 cm and 15 cm inclusive.

18. The beverage dispenser according to claim 15 , wherein the main portion of the irradiation chamber has an internal constant cross section having a surface area between 0.5 cm 2 and 4 cm 2 inclusive.

19. The beverage dispenser according to claim 15 , wherein the outlet portion is collinear to the inlet portion.

20. The beverage dispenser according to claim 15 , wherein the ultraviolet light emitting member comprises ultraviolet light emitting diodes.