JPH02218490A - Ultraviolet sterilization apparatus - Google Patents

Abstract

PURPOSE:To prevent a lowering of a sterilization dose due to the contamination by preventing the contamination of the surface brought into contact with treated water of ultraviolet ray pervious glass as low as possible by covering the surface brought into contact with water of the ultraviolet ray pervious glass with an ultraviolet ray pervious film. CONSTITUTION:In an apparatus for sterilizing water using a sterilizing lamp 7, the surface brought into contact with water of ultraviolet ray pervious glass 1 is covered with an ultraviolet ray pervious film 12 (e.g. fluoroplastic film). As a result, the contamination of the surface brought into contact with treated water of the ultraviolet ray pervious glass 1 of an ultraviolet ray sterilization apparatus is prevented as low as possible and a lowering of a sterilization dose due to contamination is prevented and initial sterilization power can be kept for a long time.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an ultraviolet sterilization device for water.

(Prior Art) Sterilizing water using germicidal lamps is used in everything from household water purifiers to large-scale water treatments such as sterilizing water in swimming pools and the like. Its structure is that the germicidal lamp itself is a double-tone type, and the germicidal lamp is covered with an ultraviolet-transparent glass such as a quartz tube (for example,
30192) or a germicidal lamp is placed in the center,
A flow channel is attached around the periphery for water to pass through, and the inside thereof is usually made of ultraviolet-transparent glass.

(For example, Utility Model Application Publication No. 60-179390, Utility Model Application No. 61
(Publication No. 178992) (Problem to be solved by the invention) However, impurities contained in the water itself are increasing year by year, whether it is tap water or water used for commercial purposes, due to river pollution. In addition, in condominiums, a system is used in which water is pumped into a tank on the rooftop and distributed to each room, but if the tank becomes dirty, the water becomes even more polluted. It is possible that it will be supplied.

When such water is sterilized using a germicidal lamp having the structure described above, the surface of the ultraviolet-transmitting glass becomes resistant to dirt due to impurities in the dirty water as the amount of water to be treated increases.
As a result, the germicidal radiation output of the original lamp has been reduced, leading to the problem that the germicidal radiation dose necessary to kill germs cannot be obtained.

The present invention was proposed in order to improve the above-mentioned drawbacks, and its purpose is to prevent as much as possible the staining of the inner surface of the glass where the ultraviolet transmitting glass of the ultraviolet sterilizer and the treated water come into contact, and to reduce the sterilization dose due to staining. It is an object of the present invention to provide an ultraviolet sterilizer that can prevent a decrease in sterilization and maintain the initial sterilization resistance for a long time.

(Means for Solving the Problems) In order to achieve the above object, the present invention uses a germicidal lamp to sterilize water, and the glass surface where the ultraviolet-transparent glass and water come into contact is covered with an ultraviolet-transparent film. The present invention is characterized by an ultraviolet sterilizer characterized by being covered with.

In other words, the present invention laminates the inner surface of the glass where the ultraviolet ray transmitting glass of the ultraviolet sterilizer comes into contact with the treated water with an ultraviolet ray transmitting film, thereby making the glass surface less likely to get dirty, and even if it gets dirty, it will not get dirty. By making it easier to remove, the sterilizing dose is prevented from decreasing due to contamination.

Incidentally, a film made of fluororesin is generally suitable as the ultraviolet transmitting film, but a modified or improved film may also be used in order to improve weather resistance and stain resistance.

(Function) To prevent stains on the glass surface, make the surface hydrophobic and repel water. Especially in the case of large water droplets, the water droplets' own weight or some kind of light force can cause them to fall off. Can be done.

Such functionality can be achieved by treating the glass surface to lower the surface energy of the solid and increase the contact angle between the liquid and the solid. As one means of achieving this, the inventors laminated an ultraviolet-transparent film made of fluororesin on the glass surface to make the surface resistant to moisture and to create a water-repellent structure, thereby making the glass surface resistant to dirt. <Sh,
Even if dirt occurs, it can be easily removed.

Next, examples of the present invention will be described.

It should be noted that the embodiments are merely illustrative, and it goes without saying that various changes and improvements may be made without departing from the spirit of the present invention.

(Example 1) Figure 1 shows a running water sterilizer of the present invention. In Figure 1, 1 is an inner tube made of quartz glass, 2 is an outer tube made of hard glass, 3 is a raw water inlet, 4 is a treated water outlet, and 5 is a treated water outlet. 6 is a lower lid, 7 is a germicidal lamp, 8 is a temperature sensor, 9 is a blower, 10 is a water flow section, 11 is a space, and 12 is a fluororesin film.

Thus, the water to be treated is supplied from the raw water inlet 3 to a flowing water section 10 surrounded by an inner tube 1 made of quartz glass, an outer tube 2 made of hard glass, an upper M5, and a lower lid 6. After being irradiated with ultraviolet rays and sterilized, the treated water is discharged from the treated water outlet 4.

Here, an ultraviolet transmitting film 12 made of a fluororesin having a thickness of 15 pm is laminated by heat welding onto the water flowing side of the quartz glass inner tube 1, that is, the outer peripheral surface of the inner tube.

Next, using a 6W germicidal lamp, 3
When tap water is treated at a flow rate of 1/min, the results of tracking the change in germicidal radiation output over time with respect to the integrated flow rate are shown in Table 1. The relative value is shown with the initial value set as 100.

Table 1 From this result, it was found that the lamination treatment resulted in a smaller decrease in the germicidal radiation output.

(Example 2) When using the apparatus of Example 1 and using a laminated quartz tube, for every 5000 ffi of cumulative flow rate, purified water was flowed from water outlet 4 for 1 minute for backwashing and exposed to ultraviolet rays. When we measured the strength, we obtained the results shown in Table 2.

No. table

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the ultraviolet water sterilization device of the present invention. Engineering: Inner tube made of quartz glass, 2... Outer tube made of hard glass, 3... Raw water inlet, 4... Treated water outlet, 5...
・Top lid, 6...Lower lid, 7...Bactericidal lamp, 8...
Temperature sensor, 9... Air blower, 10... Water flow part, 11
...Space, 12...Fluororesin film. From the above results, it is clear that the antifouling effect was improved by backwashing every 500 oz. (Effects of the Invention) As described above, according to the present invention, by laminating an ultraviolet transmitting film on the outer surface of the quartz tube of an ultraviolet sterilizer, the antifouling effect of the glass surface is improved and a decrease in the output of ultraviolet rays is suppressed. It also has the effect of making it easy to remove dirt even if it becomes dirty.

Claims (1)

[Claims] In a device that sterilizes water using a germicidal lamp,
An ultraviolet sterilizer characterized by covering the glass surface where the ultraviolet-transparent glass and water come into contact with an ultraviolet-transparent film.