WO2004036619A1

WO2004036619A1 - Ultraviolet irradiation device

Info

Publication number: WO2004036619A1
Application number: PCT/JP2003/013421
Authority: WO
Inventors: Toshio Sumi
Original assignee: Futaba Technology Corporation
Priority date: 2002-10-21
Filing date: 2003-10-21
Publication date: 2004-04-29
Also published as: JP2004146077A

Abstract

It comprises an inner electrode (10) disposed at the center, a lamp body (14) that is of double-tube construction surrounding the inner electrode (10) and that has an electric discharge space having enclosed therein an electric discharge body (14a) adapted to effect electric discharge within the double tube to emit ultraviolet rays, and an outer electrode (12) that has an outer wall surrounding the lamp body (14) and within which a liquid (1) to be processed is passed, the outer wall being formed as an electrode, wherein there is formed an electrodeless lamp that, by applying a high frequency voltage or pulse voltage across the inner and outer electrodes (10, 12), can cause the electric discharge body (14a) of the lamp body (14) internally disposed between the electrodes to effect electric discharge to directly irradiate the externally flowing liquid (1), which is to be processed, with ultraviolet rays.

Description

Description UV irradiation equipment

(Technical field)

The present invention relates to an ultraviolet irradiation apparatus, and more particularly, to sterilization and decolorization of a liquid or gas (medium to be treated) by irradiating ultraviolet rays with an electrodeless discharge lamp that emits light by electrostatically coupled discharge. The present invention relates to an ultraviolet irradiation device for performing processing such as bleaching.

(Background technology)

Conventionally, ultraviolet irradiation devices have been used for, for example, sterilization of water and sewage, disinfection and decolorization, deodorization and decolorization of industrial water, bleaching of pulp, sterilization of medical equipment, and the like. By irradiating the liquid to be treated with ultraviolet light from a lamp, it performs sterilization, decolorization, and bleaching. There are two types of ultraviolet irradiation devices: an electrodeless lamp type having no electrode in the lamp and an electrode lamp type having an electrode in the lamp. Since this electrodeless lamp has no electrode inside the lamp, there is no non-lighting due to deterioration of the electrode, and the structure of the lamp itself can be simplified. The electrodeless lamp is further characterized by an electromagnetic coupling method in which discharge is generated by electromagnetic energy generated from a coil wound around the lamp, a method in which the lamp is sandwiched between two electrodes, and a capacitor is formed by the electrode / lamp / electrode. It is roughly divided into the electrostatic coupling method that forms and discharges by electrostatic energy. FIG. 7 is a diagram showing an example of a conventional ultraviolet irradiation apparatus using such an electromagnetic coupling method. FIG. 8 is a diagram showing an example of a conventional ultraviolet irradiation device using an electrostatic coupling method.

As shown in FIG. 7, a conventional ultraviolet irradiator using an electromagnetic coupling method (for example, Japanese Patent Application Laid-Open No. 10-27578) encloses a discharge body that emits ultraviolet light by discharging, An electrodeless lamp body 34 having no electrodes, a coil 30 spirally wound around the outer periphery of the lamp body 34, a lamp body 34 and a coil A protective tube 31 made of a transparent quartz glass tube or a fluororesin or the like for enclosing the container 30 is provided with a peripheral device 32 surrounding the protective tube 31 and flowing the liquid 1 to be treated. Further, the coil 30 is provided with lighting means 36 for flowing high-frequency alternating current from both ends of the coil.

A conventional ultraviolet irradiation apparatus using such an electromagnetic coupling method has an inlet 32 a and an outlet 32 b through which the liquid 1 to be treated is flown in the outer casing 32, and the treatment is performed outside the protective tube 31. Liquid 1 is formed to flow directly. The lighting means 36 is configured such that the high-frequency power supply 36b generates a high-frequency current based on the commercial power supply 36a, performs matching by the matching circuit 36c, and forms a mark on the coil 30 (commonly used in the art). A high-frequency voltage of 2 MHz to 13.5 MHz is applied to this. As a result, the lamp body 34 emits ultraviolet rays by exciting the internal discharge body (not shown) by the magnetic flux of the coil 30 to which the high-frequency voltage is applied. Therefore, in the outer container 32, the liquid 1 to be treated injected from the inflow port 32a is irradiated with ultraviolet rays to perform processes such as sterilization, decolorization, and bleaching.

However, in the conventional ultraviolet irradiation apparatus using the electromagnetic coupling method, when the liquid 1 to be treated is a liquid having conductivity, the magnetic flux generated from the coil 30 spreads into the liquid 1 to be treated around the lamp body 34. However, an induced current flows in the liquid 1 to be treated, causing a loss of electromagnetic energy. A conventional technology (see, for example, Japanese Patent Application Laid-Open No. H10-155545) that suppresses the spread of the magnetic flux has been developed, but the structure is complicated and the induced current in the liquid to be treated is completely eliminated. That was impossible.

However, unlike the above-mentioned ultraviolet irradiation device using the electromagnetic coupling method, the lamp body is sandwiched between two electrodes to form a simple capacitor structure of the electrode / lamp Z electrode, which is discharged by electrostatic energy. 2. Description of the Related Art There is a conventional ultraviolet irradiation apparatus using an electrostatic coupling method (for example, see Japanese Patent Application Laid-Open No. 2002-205321) which causes a discharge of a body. As shown in Fig. 8, this conventional ultraviolet irradiation device seals a discharge body that emits ultraviolet light by discharging. Enclosing a lamp body 44 with no electrodes inside without electrodes, a pair of electrode plates 40 placed so as to sandwich this lamp body 44, the lamp body 44 and the electrode plate 40 A protective tube 41 made of a transparent quartz glass tube or fluororesin or the like, and an outer case 42 surrounding the protective tube 41 and flowing the liquid 1 to be treated therein. In this case, the outer container 42 has an inlet 42 a for flowing the liquid 1 to be treated and an outlet 42 b, and is formed so that the liquid 1 flows directly outside the protective tube 41. Further, a lighting means 46 for applying a high-frequency voltage to each of the pair of electrode plates 40 is provided. The lighting means 46 is configured such that a high-frequency power supply 46b generates a high-frequency voltage based on a commercial power supply 46a, performs matching by a matching circuit 46c, and applies the same to the electrode plate 40 (generally, 2 A high frequency voltage of MHz to 13.5 MHz is applied). Here, the lamp body 44, the protective tube 41, the outer peripheral device 42, and the lighting means 46 are the same components as those of the ultraviolet irradiation device shown in FIG. 7, and the overlapping description will be omitted. .

In such a conventional ultraviolet irradiation apparatus using the electrostatic coupling method, the liquid 1 to be treated is directly flown outside the protective tube 41, and the commercial power supply 46a, the high-frequency power supply 46b, and the matching of the lighting means 46 are provided. A high frequency voltage is generated by the circuit 46 c and applied to the electrode plate 40. Here, the voltage applied to the electrode plate 40 is not limited to the high-frequency voltage, and for example, a pulse voltage may be applied. Then, in the lamp body 44, an internal discharge body (not shown) is excited by electrostatic energy of the electrode plate 40 to generate a discharge and emit ultraviolet rays. Therefore, in the outer container 42, the liquid 1 to be treated injected from the inlet port 42a is irradiated with ultraviolet rays to perform processes such as sterilization, decolorization, and bleaching. In this manner, in the case of the electrostatic coupling method, by covering the periphery of the lamp body 44 with the electrode plate 40, the energy due to the magnetic flux leakage as in the electromagnetic coupling method shown in FIG. 7 is obtained. Losses are reduced.

However, in the conventional ultraviolet irradiator using the electrostatic coupling method, the electrode plate 40 covers the lamp body 44 itself. Therefore, on the contrary, the ultraviolet rays generated in the lamp body 44 are shielded, and the amount that can be radiated outside is reduced. As a result, there was a problem that the generated ultraviolet rays could not be used effectively.

As described above, in the conventional ultraviolet irradiation apparatus, in the case of the electromagnetic coupling method shown in FIG. 7, when the liquid 1 to be treated is a conductive liquid, the magnetic flux generated from the coil 30 is generated around the lamp body 34. Since the liquid spreads in the liquid 1 to be treated, an induced current flows in the liquid 1 to be treated, causing a loss of electromagnetic energy.

In the case of the conventional ultraviolet irradiation apparatus, in the case of the electrostatic coupling method shown in FIG. 8, there is no energy loss due to the leakage of magnetic flux as in the electromagnetic coupling method described above, but the lamp body 44 itself is connected to the electrode plate. Since 40 is covered, the ultraviolet rays generated in the lamp body 44 are shielded, and the amount that can be radiated to the outside is reduced. As a result, there was a problem that the generated ultraviolet light could not be used effectively.

(Disclosure of the Invention)

The present invention solves such a problem, and provides a low-cost ultraviolet irradiation apparatus that has a simple structure with a small energy loss and improves the light emission and transmission efficiency without blocking the emission of ultraviolet light. With the goal.

In order to solve the above-described problems, the present invention includes an internal electrode disposed at a central portion, and a discharge space for accommodating a discharge body that emits ultraviolet light at the time of discharge, and a laser disposed so as to surround the internal electrode. A lamp body, an outer electrode surrounding the lamp body at a predetermined distance from the lamp body, and an external electrode formed so as to face the internal electrode, and a medium to be processed flowing along the outer periphery of the lamp body. And an external electrode as an outer wall of the channel.

The lamp body has a double tube structure including a first space for housing the internal electrode and a second space for forming the discharge space. In addition, a rare gas and / or mercury is used as a discharge body. 421

5 In addition, a plurality of internal electrodes arranged in the center and a plurality of ultraviolet lamps that emit ultraviolet light during discharge are arranged so as to surround the internal electrodes. An external electrode is formed so as to surround the lamp body at a predetermined interval and faces the internal electrode, and a flow path formed to allow a medium to be processed to flow along the outer periphery of the lamp body. The external electrode is used as the outer wall of the channel.

Further, a lighting means for applying either a high-frequency voltage or a pulse voltage is provided between the internal electrode and the external electrode, and the flow path is provided with an inlet and an outlet for the medium to be processed.

(Brief description of drawings)

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

FIG. 2 is a view showing a cross section taken along line AA shown in FIG. 1. FIG. 3 is a view showing an internal structure of the lamp body shown in FIG.

FIG. 4 is a diagram showing a cross section taken along the line BB shown in FIG.

FIG. 5 is a configuration diagram showing another embodiment of the ultraviolet irradiation device according to the present invention.

FIG. 6 is a view showing a cross section taken along line C-C shown in FIG.

FIG. 7 is a diagram showing an example of a conventional ultraviolet irradiation device using an electromagnetic coupling method.

FIG. 8 is a diagram showing an example of a conventional ultraviolet irradiation device using an electrostatic coupling method.

(Best mode for carrying out the invention)

Next, an embodiment of an ultraviolet irradiation device according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a configuration diagram showing an embodiment of an ultraviolet irradiation device according to the present invention. FIG. 2 is a view showing a cross section taken along line AA shown in FIG. FIG. 3 is a diagram showing the internal structure of the lamp body 14 shown in FIG. FIG. 4 is a view showing a cross section taken along line BB shown in FIG. FIG. 5 is a configuration diagram showing another embodiment of the ultraviolet irradiation apparatus according to the present invention. FIG. 6 is a view showing a cross section taken along line C-C shown in FIG.

As shown in FIGS. 1 and 2, the ultraviolet irradiating device according to the present invention differs from the prior art shown in FIGS. 7 and 8 in that an internal electrode 10 provided in a bar shape at the center is provided with: A lamp body 14 is formed in a double tube structure surrounding the internal electrode 10 and has a discharge space enclosing a discharge body 14 a that emits ultraviolet light by discharging in the double tube. Further, an external electrode 12 is formed, which has an outer wall surrounding it and allows the liquid to be treated 1 to flow therein and forms the outer wall as an electrode. The internal electrode 10 and the external electrode 12 are connected to the lighting means 16 and are formed so that either a high-frequency voltage or a pulse voltage can be applied. At this time, when a high-frequency voltage is applied, for example, the high-frequency power source generates a high-frequency current based on a commercial power source as in the prior art shown in FIGS. After the matching is performed, the inner electrode 10 and the outer electrode 12 are applied to the respective electrodes (generally, a high-frequency voltage of 2 MHz to 13.5 MHz is applied).

Therefore, in the ultraviolet irradiation apparatus according to the present invention, the inner electrode 10 is provided in the center cavity of the lamp body 14, and the outer electrode is not provided on the lamp body 14, and the outer outer wall via the liquid 1 to be treated is provided. It is arranged in the same way as a coaxial cable that interposes the lamp body 14 and the liquid to be treated 1 between the internal electrode 10 and the external electrode 12 (see FIG. 2). As a result, when a voltage is applied between the internal electrode 10 and the external electrode 12, the discharge body 14 a of the lamp body 14 adjacent to the liquid 1 to be treated is excited to generate a discharge, and ultraviolet light is emitted. Release. Therefore, all the electrical energy generated between the electrodes contributes to the discharge light emission of the discharge body 14a. In addition, unlike the electromagnetic coupling method using a coil of the prior art, it is possible to prevent the electromagnetic induction from being consumed in the liquid 1 to be treated.

Here, the lamp body 14 is made of a transparent material such as quartz glass and has a double tube structure. As shown in FIGS. 3 and 4, an internal electrode is provided in the central cavity of the double tube. 10 is arranged (sealed), and a discharge vessel 14a such as mercury or argon (rare gas) is sealed in a double tube on the outer periphery, forming a dielectric container equivalent to a so-called electrodeless lamp. I have. That is, since the lamp body 14 has a double-tube structure and seals the internal electrode 10, the protective tubes (31, 41) according to the prior art shown in FIGS. 7 and 8 are unnecessary. become. This protective tube is made of a quartz glass tube or a fluororesin, and generally has an ultraviolet transmittance of about 80%. Therefore, if the protective tube is used, about 20% of ultraviolet rays are lost. In the present invention, since the lamp body 14 and the liquid 1 to be treated come into direct contact with each other without using a protective tube, the liquid 1 to be treated is irradiated with ultraviolet rays without being attenuated.

Referring again to FIGS. 1 and 2, an outer electrode 12 having a cylindrical outer wall with a bottom on the outside of the lamp body 14 and arranged so as to surround the lamp body 14 is shown. Is provided. On the outer wall of the external electrode 12, an inlet 12 a for inflowing the liquid 1 to be treated and an outlet 12 b for discharging the liquid 1 are provided, respectively. A flow path is formed so that the processing liquid 1 flows. Therefore, the cooling effect of the lamp body 14 can be enhanced. Since there is nothing between the external electrode 12 and the lamp body 14 such as a coil or an electrode plate that blocks ultraviolet rays, and there is no protective tube that transmits and attenuates ultraviolet rays, the lamp body 14 emits light. The treated liquid 1 can be efficiently irradiated with the ultraviolet light. Therefore, the lamp body 14 can directly irradiate the liquid 1 to be treated with ultraviolet rays, and the transmission efficiency does not decrease. In addition, since the heat is efficiently transferred to the liquid to be treated 1 and cooled, the ultraviolet light emission efficiency is reduced depending on the ambient temperature. Can be prevented.

Further, the external electrode 12 is connected to the lighting means 16, and the entire outer wall is formed so as to be an electrode through which a high-frequency current flows. In this case, it is desirable that the external electrode 12 be formed of a hollow metal pipe in order to flow a high-frequency current. For example, the external electrode 12 is mirror-finished so as to reflect the ultraviolet light emitted from the lamp body 14. It is most preferably formed from stainless steel. Here, since the external electrode 12 and the internal electrode 10 are electrostatically coupled, it is not always necessary to use a non-magnetic material. Further, the external electrodes 12 and the internal electrodes 10 may be configured by baking or printing a metal on the surface of the base material so as to have a mesh structure, for example.

In the ultraviolet irradiation apparatus according to the present invention thus formed, as shown in FIG. 1, the inlet 12 a is formed in the flow path formed by the lamp body and the external electrode 12 surrounding the lamp body 14. The liquid to be treated 1 flows from the outlet and is discharged from the outlet 12 b, and a high-frequency voltage or a pulse voltage is generated by the lighting means 16 and applied to the internal electrode 10 and the external electrode 12. Accordingly, the lamp body 14 is excited by the electrostatic energy generated between the internal electrode 10 and the external electrode 12 to excite and discharge the discharge body 14a, thereby emitting ultraviolet rays. Therefore, in the flow channel, the liquid 1 to be treated injected from the inlet 12a is efficiently irradiated with ultraviolet rays, and processes such as sterilization, decolorization, and bleaching are performed.

As described above, according to the ultraviolet irradiation apparatus of the present invention, the lamp body 14 and the liquid 1 to be treated are interposed between the internal electrode 10 and the external electrode 12 in the same arrangement as the coaxial cable (first embodiment). 2), all the electric energy can contribute to the discharge light emission of the discharge body 14a, and the electric energy generated between the electrodes is outside the discharge space of the lamp body. It can prevent the electromagnetic induction port from being spread and consumed.

According to the ultraviolet irradiation device of the present invention, the lamp body A flow path for flowing the liquid to be treated 1 is provided between 14 and the external electrode 12, and since the ultraviolet rays are not blocked by the electrodes, the ultraviolet rays can be directly applied to the liquid to be treated 1, generating The ultraviolet rays thus obtained can be used effectively.

Further, according to the ultraviolet irradiation apparatus of the present invention, when the lamp body 14 is disposed in the liquid 1 to be treated, a protective tube for transmitting and attenuating ultraviolet rays is not used, so that the cost of parts can be reduced, and The liquid 1 to be treated can be irradiated without attenuating the ultraviolet light of the lamp body 14.

Furthermore, according to the ultraviolet irradiation apparatus of the present invention, the cooling effect is obtained by arranging the lamp body 14 directly in the liquid 1 to be treated without using the above-mentioned protective tube. It is possible to prevent the lamp body 14 from deteriorating in ultraviolet light emission efficiency depending on the ambient temperature.

Next, another embodiment of the ultraviolet irradiation apparatus according to the present invention will be described in detail with reference to FIG. 5 and FIG. As shown in FIGS. 5 and 6, another embodiment of the ultraviolet irradiation apparatus according to the present invention is different from the above-described structure in which a discharge body such as mercury or argon (rare gas) is sealed in the lamp body. It uses a structure in which a plurality of commercially available straight tube electrode lamps 28 (ultraviolet lamps) are enclosed as discharge bodies. Except for the lamp body 24 in which a plurality of the electrode lamps 28 are sealed, the configuration is the same as that of the ultraviolet irradiation apparatus shown in FIG. 1 and a duplicate description is omitted.

Here, the lamp body 24 has a centered inner electrode 20 and a plurality of straight tube-type electrode lamps 28 (ultraviolet lamps) (eight in FIG. 6) arranged around it. In addition, the periphery of the electrode lamp 28 is further enclosed by a material that transmits ultraviolet rays such as quartz glass and sealed. The outer periphery of the lamp body 24 is further provided with an external electrode 22 surrounded by a cylindrical outer wall having a bottom, and an inlet 22 a and an outlet 22 are provided on the outer periphery of the external electrode 22. b and lamp body 24 and external electrode 22 The liquid 1 to be treated is formed to flow through the flow path between the first and second liquids. In the ultraviolet irradiation apparatus according to the present invention thus formed,

By applying a high-frequency voltage or a pulse voltage to both the inner electrode 20 and the outer electrode 22, electrodeless discharge occurs in the electrode lamp 28 housed in the lamp body 24. UV light is emitted from the lamp surface. Therefore, in the flow channel, the liquid 1 to be treated injected from the inlet 22 a is effectively irradiated with ultraviolet rays, and processing such as sterilization, decolorization, and bleaching is performed.

Thus, according to the ultraviolet irradiation apparatus of the present invention, similarly to the ultraviolet irradiation apparatus shown in FIG. 1, the lamp body 24 and the liquid to be treated are disposed between the internal electrode 20 and the external electrode 22. With the interposition of 1 and the same arrangement as the coaxial cable (see Fig. 6), all electrical energy can contribute to the discharge light emission of the electroded lamp 28. Also, it is possible to prevent the electromagnetic induction port from being consumed by the electric energy generated from between the electrodes being spread to and consumed outside the discharge space of the lamp body.

Further, according to the ultraviolet irradiation apparatus of the present invention, similarly to the ultraviolet irradiation apparatus shown in FIG. 1, a flow path for flowing the liquid 1 to be treated is provided between the internal electrode 20 and the external electrode 22. Since the ultraviolet rays are not blocked by the electrodes, the ultraviolet rays can be directly applied to the liquid 1 to be treated, and the generated ultraviolet rays can be used effectively.

Further, according to the ultraviolet irradiation apparatus of the present invention, a commercially available electrode lamp 28 can be used without newly providing a discharge body, and an electrodeless ultraviolet irradiation apparatus can be easily formed.

As described above, the embodiment of the ultraviolet irradiation apparatus according to the present invention has been described in detail. However, the present invention is not limited to the above-described embodiment, and can be changed without departing from the gist. The embodiment has been described in which the liquid flows in from the lower inlet of the external terminal and is discharged from the upper outlet. However, the present invention is not limited to this, and the outlet and the inlet are provided upside down. May be.

Further, the embodiment in which the external electrode is formed in a cylindrical shape with a bottom and an inflow port is provided on the outer periphery has been described. However, the present invention is not limited to this. It is also possible to provide in

It should be understood that the liquid to be treated is not limited to a liquid but includes a gas.

Claims

Scope of Claim Internal electrode located in the center,

A lamp body provided with a discharge space for accommodating a discharge body that emits ultraviolet light at the time of discharge, and arranged so as to surround the internal electrode;

An outer electrode formed to surround the lamp body at a predetermined distance from the lamp body and to face the internal electrode;

A flow path formed so that the medium to be processed flows along the outer periphery of the lamp body;

An ultraviolet irradiation device comprising:

The ultraviolet irradiation device according to claim 1, wherein the external electrode is an outer wall of the flow path.

2. The ultraviolet irradiation device according to claim 1, wherein the lamp body has a double-tube structure including a first space accommodating the internal electrode and a second space forming the discharge space. 3. UV irradiation device.

The ultraviolet irradiation device according to claim 1, wherein the discharge body uses a rare gas and Z or mercury.

An internal electrode located in the center,

A lamp body in which a plurality of ultraviolet lamps that emit ultraviolet light at the time of discharge are arranged so as to surround the internal electrode, and the ultraviolet lamp is housed and sealed;

An external electrode formed to surround the lamp body at a predetermined distance from the lamp body and to face the internal electrode;

An ultraviolet irradiation device comprising: The ultraviolet irradiation device according to claim 5, wherein the external electrode is an outer wall of the flow path.

The ultraviolet irradiation device according to any one of claims 1 to 6,

An ultraviolet irradiation device, comprising: lighting means for applying one of a high-frequency voltage and a pulse voltage between the internal electrode and the external electrode.

The ultraviolet irradiation device according to any one of claims 1 to 7,

An ultraviolet irradiation apparatus, wherein the flow path is provided with an inlet and an outlet for the medium to be processed.