JP3205916B2 - UV irradiation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet irradiation apparatus used for an ultraviolet sterilizer or an organic matter decomposer.

[0002]

2. Description of the Related Art A so-called externally illuminated ultraviolet irradiation apparatus for irradiating ultraviolet rays from the outside of a water pipe made of a material which transmits ultraviolet light has been implemented. Such an externally illuminated device is convenient for replacing, repairing, inspecting, and maintaining the ultraviolet lamp, and particularly when the fluid is stagnant on the inner surface of the water pipe and contamination easily occurs, the ultraviolet light is strongly applied to the inner surface. Irradiation to prevent contamination.

However, in such an externally illuminated ultraviolet irradiation apparatus, if the processing fluid has poor ultraviolet transmission, such as milk or sugar water, the amount of ultraviolet radiation that reaches the central portion of the water pipe is reduced, resulting in sterilization. And other processing effects are reduced. Therefore, conventionally, in order to obtain a sufficient processing effect in the central portion of the water pipe, processing that sacrifices efficiency is performed, for example, by reducing the flow rate of the entire processing fluid.

[0004]

The problem to be solved is that if the ultraviolet radiation of the processing fluid in the external illumination type ultraviolet irradiation apparatus is poor, efficiency is sacrificed, for example, the flow velocity of the entire processing fluid is reduced. That is, processing must be performed.

[0005]

According to the present invention, there is provided an ultraviolet irradiation apparatus for irradiating ultraviolet rays from the outside of a water pipe made of a material which transmits ultraviolet light, wherein an inner tube 8 sealed inside the water pipe is provided. An ultraviolet irradiation apparatus having a structure provided, wherein a layer thickness of the processing fluid between the water pipe and the inner pipe is kept constant.

[0006]

According to this, since the layer thickness of the processing fluid is kept constant, a certain processing effect can be obtained as a whole, and efficient processing can be performed.

[0007]

1 shows a casing 1, a lamp holder 2, a lamp socket 3, and an ultraviolet (sterilization) lamp 4. Reference numeral 5 denotes an inner / outer pipe attachment pipe serving as an inlet or an outlet of a processing fluid, 6 denotes a water passage pipe (tube) made of a material that transmits ultraviolet light, and 7 denotes a fixed band of the water passage pipe 6. It constitutes an ultraviolet irradiation device. A similar inner / outer pipe mounting pipe 5 'is also provided at the other end of the water pipe 6.
Are provided, but illustration is omitted.

Reference numeral 8 denotes an inner tube. The inner tube 8 is sealed at one end and attached to a tip support 9 provided at the other end of the water passage 6, and the other end is attached to the inner and outer tubes. The pipe 5 is attached to a seal gland provided on a companion flange 10 of a flange portion provided at a position following the water pipe 6. That is, the other end of the inner tube 8 has a seal nut 11
The inner tube 8 and the seal nut 11 are attached to the companion flange 10 via a seal packing (O-ring) 12. Reference numeral 13 denotes a flange packing.

In this device, for example, a section indicated by an arrow a is as shown in FIG. 2A. Also, the cross section indicated by the arrow b is as shown in B of the same figure. Here, assuming that the inner diameter of the water pipe 6 is D and the outer diameter of the inner pipe 8 is d, the water pipe 6 and the inner pipe 8 A gap of t = (D−d) / 2 is formed. This interval is constant over the entire circumference and substantially the entire length of the inner tube 8, so that the layer thickness of the flowing processing fluid is small and is kept constant (t).

[0010] Therefore, in this apparatus, the layer thickness of the processing fluid is reduced, so that the ultraviolet ray transmission distance is shortened, and sufficient processing can be performed even when the ultraviolet ray permeability of the processing fluid is poor. Further, since the thickness of the flowing processing fluid is constant, a constant processing effect can be obtained for the entire processing fluid, and efficient processing can be performed. That is, since the layer thickness of the processing fluid is constant, stable processing performance can be obtained by determining the irradiation output of the ultraviolet lamp 4, the flow rate of the processing fluid, and the like in consideration of the layer thickness (t).

The outer diameter (d) of the inner tube 8 may be changed in accordance with the ultraviolet transmittance of the processing fluid to obtain a more suitable layer thickness (t). The material of the inner tube 8 may be made of a material that transmits ultraviolet light, and an ultraviolet lamp may be provided inside the inner tube 8 so that the inside and outside surfaces of the processing fluid are irradiated with ultraviolet light.

In this way, according to the above-mentioned apparatus, since the layer thickness (t) of the processing fluid is kept constant, a constant processing effect can be obtained as a whole and efficient processing can be performed.

Further, in the above-described apparatus, the effect of stirring the processing fluid can be enhanced by making the structure of the inner tube 8 not a tube but a spiral 30 as shown in FIG.

By providing a brush 40 in the structure of the inner tube 8 as shown in FIG. 4, it is possible to remove dirt and the like adhering to the inner wall surface of the water pipe 6 as the inner tube 8 is moved in and out. By using a structure in which the inner tube 8 is fixed to the seal gland, the inner tube 8 can be moved.

If the surface of the inner tube 8 is made of a material having a high ultraviolet reflectance, the performance can be improved. If the material of the inner tube 8 is a photoreactive metal semiconductor (such as titanium dioxide), the performance can be further improved.

[0016]

According to the present invention, since the thickness of the processing fluid is kept constant, a constant processing effect can be obtained as a whole, and efficient processing can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an example of an ultraviolet irradiation device according to the present invention.

FIG. 2 is a diagram for explaining this.

FIG. 3 is a configuration diagram of an application example.

FIG. 4 is a configuration diagram of an application example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Lamp holder 3 Lamp socket 4 Ultraviolet (sterilization) lamp 5 Inner / outer pipe attachment pipe which becomes an inlet or outlet of a processing fluid 6 Water passage pipe (tube) made of a material which transmits ultraviolet rays 7 Fixing band 8 Inner cylinder pipe 9 Tip support Tool 10 Companion flange 11 Seal nut 12 Seal packing (O-ring) 13 Flange packing

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Claims (2)

(57) [Claims] 1. An ultraviolet irradiation device for irradiating ultraviolet rays from the outside of a water pipe made of an ultraviolet-permeable material, wherein an inner tube sealed inside the water pipe is provided. An ultraviolet irradiation apparatus characterized in that a layer thickness of a processing fluid between the processing tube and the cylindrical tube is kept constant. 2. The ultraviolet irradiation apparatus according to claim 1, wherein a flange is provided at one end of the water pipe, and a seal gland for attaching the inner pipe is provided at a companion flange.