JP2012240033A - Ultraviolet purifying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a purifying capacity with ultraviolet rays by using a rare gas discharge lamp as an ultraviolet ray emitting light source and forming helical passages in its inside and on its outside.SOLUTION: The plurality of rare gas discharge lamps with straight tube type ultraviolet radiation parts on their light source installation parts are arranged such that the ultraviolet ray radiation parts are parallel with one another. The inner periphery side helical passage and the outer periphery side helical passage are disposed in the vicinity of the light source installation part. The inner periphery side helical passage and the outer periphery side helical passage are made of an ultraviolet ray transmitting material. The rare gas discharge lamp is an ultraviolet ray emitting rare gas discharge lamp having a glass tube with the rare gas sealed, and one pair of belt-shaped outer electrodes disposed facing a glass tube outer peripheral surface of the ultraviolet ray radiation part, and a non-outer electrode coating surface faces the inner periphery side helical passage and the outer periphery side helical passage.

Description

  The present invention relates to a cleaning apparatus for performing a cleaning process for the purpose of sterilization / disinfection using ultraviolet rays, and in particular, sterilization, disinfection, deodorization, etc. for water such as water and sewage, industrial water, and household water. The present invention relates to an ultraviolet purification apparatus that performs processing.

  In recent years, the problem of water quality has been increasing. As a countermeasure for improving the water quality, a sterilizer 900 using ultraviolet rays has been conventionally known. For example, in patent document 1, as shown in FIG. 7, it is comprised from the cylindrical sterilization container 901 and the low pressure mercury lamp 902 installed coaxially in the center part. The treated water W to be sterilized is sterilized by irradiating it with ultraviolet rays by flowing it in a direction parallel to the cylindrical axis through a flow path 903 formed in the gap between the cylindrical container and the low-pressure mercury lamp 902. The low-pressure mercury lamp 902 uses mercury as an excitation medium, emits ultraviolet light with a dominant wavelength of 254 nm and 185 nm.

  A method of providing a spiral water channel around a low-pressure mercury lamp is also known in order to improve the efficiency of ultraviolet irradiation. For example, in Patent Document 2, in an ultraviolet irradiation device in which a spiral water channel is provided around an ultraviolet light source, a space is provided between adjacent water channels in the spiral water channel, and a reflector that surrounds the spiral water channel is provided. An ultraviolet irradiation device is disclosed.

Japanese Utility Model Publication No. 63-084871 JP 2004-089941 A

  When the ultraviolet sterilizer of Patent Document 1 is used, the flowing water flows perpendicularly to the axis of the sterilization container, flows along the axis, and is discharged in a direction perpendicular to the axis. Since the length of the path was also short, the time required for running water to pass through the sterilization container was short, and the time for irradiation with ultraviolet rays was also short.

  Further, in the case of the ultraviolet irradiation device of Patent Document 2, it is possible to make the ultraviolet light enter the water channel substantially uniformly as compared with Patent Document 1. However, the low pressure mercury lamp is cooled by the spiral channel. Since the vapor pressure of mercury enclosed in the low-pressure mercury lamp varies greatly depending on the temperature, the low-pressure mercury lamp is easily affected by the ambient temperature. For this reason, particularly when low-temperature flowing water is passed through the spiral channel, there is a problem that the output of ultraviolet rays is lowered by cooling by the spiral channel.

  The present invention has been made in view of the above-mentioned problems, and the intended process is to use a rare gas discharge lamp that does not contain mercury, and is less susceptible to the influence of ambient temperature, and has an ultraviolet purification process that is highly effective in ultraviolet treatment. To provide an apparatus.

In order to achieve the above object, the present invention provides an ultraviolet purification apparatus (100) having the following characteristics.
A cylindrical light source installation part (50), an inner peripheral spiral channel (3) provided on the inner peripheral surface of the light source installation part (50), and an outer peripheral surface of the light source installation part (50) An ultraviolet purification treatment (100) comprising an outer peripheral spiral channel (2),
In the light source installation part (50), a plurality of rare gas discharge lamps (10, 20) having a straight tubular ultraviolet radiation part are arranged such that the straight tubular ultraviolet radiation part is parallel,
The inner peripheral spiral channel (3) and the outer spiral channel (2) are formed of an ultraviolet transmitting material and are formed on the upper surface side (51) or the lower surface side (52) of the light source installation part (50). It is connected via the connecting part (4) provided,
The rare gas discharge lamp (100) includes a glass tube (11) in which a rare gas (13) is hermetically sealed, and a pair of strip-like external electrodes (14) provided facing the outer peripheral surface of the glass tube of the ultraviolet radiation section. , 15), and a non-external electrode covering surface (53) having the inner peripheral spiral channel (3) and the outer peripheral spiral channel (2). ).

  Furthermore, a metal reflection wall (8) is provided outside the outer peripheral spiral channel.

  Further, the rare gas discharge lamp (10, 20) is characterized in that a gas containing xenon as a main component is sealed in an amount of 20 to 110 Torr, and the external electrodes (14, 15) are aluminum electrodes.

  According to the first aspect of the present invention, since the rare gas discharge lamp is used, it can be made less susceptible to the influence of the ambient temperature, and the use efficiency can be improved without wasting the emitted ultraviolet ray, and the ultraviolet ray treatment can be performed. Thus, it is possible to provide an ultraviolet purification processing apparatus with an enhanced effect.

Furthermore, by providing a metal reflecting wall, it is possible to further improve the utilization efficiency of ultraviolet rays and the ultraviolet treatment efficiency.
Further, by using a predetermined rare gas discharge lamp, it is possible to make it less susceptible to the influence of the ambient temperature.

  According to the present invention, since the non-external electrode covering surface provided in each rare gas discharge lamp faces the spiral channel disposed inside and outside the light source installation portion, the ultraviolet irradiation time is lengthened. Will be able to. Further, the rare gas discharge lamp and the flow path can be arranged close to each other, and the ultraviolet irradiance can be increased while suppressing the attenuation of the ultraviolet light.

  Furthermore, since the inner and outer double spiral structure is adopted, the flow path in the ultraviolet purification device can be made sufficiently long, and the irradiation time can be lengthened.

It is a schematic sectional drawing of the ultraviolet-ray purification processing apparatus of embodiment which concerns on this invention. FIG. 2 is a schematic cross-sectional view of the ultraviolet purification processing apparatus shown along line DD in FIG. FIG. 3 is a schematic front view illustrating the ultraviolet light source of FIG. 4A and 4B are cross-sectional views of the rare gas discharge lamp of FIG. 3, in which FIG. 4A is a schematic cross-sectional view along the line BB, and FIG. 4B is a schematic cross-sectional view along the line CC. FIG. 5 is a schematic cross-sectional view that is described in comparison with the ultraviolet ray purification treatment apparatus shown in FIG. FIG. 6 is a schematic front view for explaining a rare gas discharge lamp used in an ultraviolet purification apparatus according to another embodiment. FIG. 7 is a schematic cross-sectional view showing an example of a conventional ultraviolet purification device.

  Hereinafter, a liquid ultraviolet purification apparatus according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a schematic cross-sectional view showing an example of the configuration of an ultraviolet purification processing apparatus 100 according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of the configuration of the ultraviolet purification processing apparatus 100 taken along line DD in FIG. It is. The ultraviolet purification processing apparatus 100 of the present embodiment includes a cylindrical jacket 1, a plurality of rare gas discharge lamps 10 provided inside the jacket 1, an outer circumferential spiral channel 2, an inner circumferential spiral channel 3, A connecting portion 4, a water inlet 5 connected to the outer spiral path 2, and a water outlet 6 connected to the inner spiral path 3 are provided.

  The jacket 1 has an external cylindrical shape and is made of a metal material. When the inner diameter of the jacket 1 is compared with the length of the jacket inner diameter in the direction of the central axis X, the cylindrical shape has a long length in the central axis direction, that is, a vertically long cylindrical shape. By increasing the length in the central axis direction, the ultraviolet ray treatment effect can be enhanced even if the number of straight tubular rare gas discharge lamps is reduced. Further, the inner surface 1a of the jacket 1, that is, the inner peripheral surface, is made a reflecting surface 8 made of a mirror surface with improved smoothness. The reflecting surface 8 is an ultraviolet reflecting surface that reflects the ultraviolet rays emitted from the rare gas discharge lamp 10.

  The metal used for the jacket 1 is preferably aluminum (Al) or an alloy containing aluminum as a main component. This is because aluminum has a high ultraviolet reflectance and a high thermal conductivity. When the thermal conductivity is high, the heat generated by the lighting of the ultraviolet lamp can be efficiently radiated to the outside. Moreover, although the base material of the jacket 1 was used as it is for the ultraviolet reflecting surface 8, it may be provided with an ultraviolet reflecting film separately on the inner surface. Further, instead of the metal material, a resin material in which a single-layer or multi-layer ultraviolet reflecting film that does not transmit ultraviolet rays is provided on the inner surface facing the ultraviolet lamp can be used.

  The rare gas discharge lamp 10 has a straight tube shape, and in the present embodiment, eight lamps are arranged symmetrically about the central axis X at equal intervals (see FIG. 2). Further, the space where the eight rare gas discharge lamps 10 are arranged has a substantially cylindrical shape. This cylindrical space corresponds to the light source installation unit 50 described later.

  The outer peripheral spiral channel 2 is arranged in a space between the light source installation part 50 and the jacket inner surface 1a. The outer circumferential spiral channel 2 is disposed by winding a tube made of an ultraviolet transmitting material in a spiral manner so as to be coaxial with the central axis X across the gas layer 55 on the outer periphery of the light source installation unit 50. The hollow interior of the tube becomes a flow path through which the water to be treated W passes. By forming a spiral passage that the channel travels around the noble gas discharge lamp 10, it flows through a fixed channel as compared to a cylindrical space as in Patent Document 1, Moreover, the length can be lengthened. By setting the length of the flow path to be a spiral path, the ultraviolet light irradiated from the rare gas discharge lamp 10 can be irradiated to the water to be treated W over a long distance. Therefore, ultraviolet energy can be utilized without waste. Further, the water to be treated W that travels through the flow path advances while the relative positional relationship changes with respect to the rare gas discharge lamp 10. That is, the to-be-treated water W is mixed while traveling in a turbulent flow through the flow path, and the entire to-be-treated water is uniformly irradiated with ultraviolet light, so that effects such as sterilization and disinfection are improved.

  The tube is made of a material that transmits ultraviolet light. In particular, a fluorine-based resin material is preferable. By using a resin material, it can be easily spirally wound. Specifically, PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), FEP (tetrafluoroethylene / hexafluoropropylene copolymer (4.6 fluoride)) PTFE (polytetrafluoroethylene (tetrafluoroethylene (tetrafluoride)) )) Etc. can be used.

  Further, the outer circumferential spiral channel 2 may be a tube in which a tube is wound many times, but is not limited thereto. For example, a quartz block having a spiral passage may be provided, or a cylindrical quartz may be integrated by winding a fluororesin tube.

  The inner circumferential spiral channel 3 is disposed in a space between the light source installation part 50 and the jacket central axis X. The inner peripheral spiral flow path 3 has a shape in which a tube made of an ultraviolet transmitting material is spirally wound many times so as to be coaxial with the central axis X across the gas layer 55 in the inner periphery of the light source installation portion 50. Arrange. The hollow interior of the tube becomes a flow path through which the water to be treated W passes.

  Also, the inner circumferential spiral channel 3 may be a tube in which a tube made of a fluorine-based resin material is wound many times in the same manner as the outer spiral channel 2. In addition, as with the outer peripheral spiral channel 2, a quartz block having a spiral passage may be provided, or a cylindrical quartz may be integrated by winding a fluororesin tube.

  The connecting portion 4 is disposed on the upper surface 51 side of the light source installation portion 50 having a cylindrical shape, and connects the outer side spiral channel 2 and the inner side spiral channel 3 to each other. That is, as shown by a dotted line in FIG. 1, the two spiral channels 2 and 3 are connected to each other at one end.

  On the lower surface 52 side of the light source installation portion 50 having a cylindrical shape, a water inlet 5 and a water outlet 6 extending from the bottom of the jacket 1 to the outside are arranged. The water inlet 5 is provided at one end not connected to the connecting portion 4 of the outer circumferential spiral channel 2, and the water outlet 6 is not connected to the connecting portion 4 of the inner spiral channel 3. It is provided at one end. As a result, the water W to be sterilized is introduced into the apparatus from one end of the two spiral flow paths 2 and 3 arranged inside and outside so as to sandwich the light source installation part 50, and spirals on the outer peripheral side. After passing through the inside of the flow channel 2, the other spiral flow channel (inner circumferential spiral flow channel 3) flows through the connecting portion. Thereafter, the water is discharged from the water outlet 6 provided at the end. The water inlet 5 and the water outlet 6 may be reversed.

  For example, when water enters from the outer spiral channel 2, the water to be treated is irradiated with ultraviolet rays emitted from the non-external electrode covering surface 53 of the rare gas discharge lamp 10 while flowing through the outer spiral channel 2. After being transferred to the inner spiral channel 3 via the connecting portion 4, the treated water W flows through the inner spiral channel 3 while the non-external electrode covering surface of the rare gas discharge lamp 10. Upon receiving the ultraviolet light emitted from the water 53, the treated water is discharged from the water outlet 6 thereafter.

  Next, the rare gas discharge lamp 10 will be described.

  3 and FIG. 4 are diagrams for explaining the rare gas discharge lamp 10. FIG. 3 is a schematic front view showing the rare gas discharge lamp 10. FIG. 4 shows a BB line of the rare gas discharge lamp shown in FIG. It is a schematic sectional drawing in alignment with CC line.

  The rare gas discharge lamp 10 includes a tubular glass tube 11, a rare gas 13 such as xenon filled in a sealed space inside the glass tube 11, and a pair of strip electrodes 14 and 15 provided on the outer periphery of the glass tube 11. When the noble gas discharge lamp 10 is turned on, it emits ultraviolet rays. Reference numeral 17 denotes an ultraviolet light transmissive heat shrinkable film provided on the outer periphery of the glass tube 11. The heat shrinkable film 17 has an opening 19, and the glass tube 11 is exposed at the position of the opening 19. .

  The glass tube 11 is made of a glass composition that can transmit ultraviolet rays, and is formed in a tubular shape. The end portion of the glass tube 11 is welded to the end portion of the glass tube, for example, by reducing the diameter while heating the glass tube. A sealing glass may be disposed at the end portion and welded and sealed. In the present embodiment, a cylindrical straight tube shape as shown in FIG. 4 is used.

  A predetermined rare gas 13 is sealed in a sealed space inside the glass tube 11. The rare gas 13 is filled with a predetermined amount of a rare gas such as xenon (Xe), krypton (Kr), argon (Ar) or the like. The enclosed rare gas 13 acts as an excitation medium. When a single gas is enclosed, ultraviolet rays of 172 nm, 146 nm, and 126 nm are generated, respectively. The sealing pressure is, for example, 20 to 110 Torr (normal temperature) of a gas mainly containing xenon. Also, mercury is not enclosed in the internal space as the main luminescent material for the ultraviolet light source. Further, the phosphor layer is not provided on the inner peripheral surface 16 that forms the sealed space of the glass tube 11. A phosphor layer that emits ultraviolet rays and / or a phosphor layer having a concentration that allows passage of ultraviolet rays may be provided on the inner peripheral surface 16.

  A pair of external electrodes 14 and 15 are provided on the outer peripheral surface 12 of the glass tube 11. The external electrodes 14 and 15 are provided with a pair of strip-shaped conductors so that the external electrodes 14 and 15 are opposed to each other in the cross section with the central axis of the glass tube 11 as the center over the entire length of the glass tube 11. ing. The external electrodes 14 and 15 are preferably made of aluminum foil, but in addition, a metal material such as silver can be used as a material having conductivity and durability against ultraviolet rays. The aluminum external electrode is called an aluminum external electrode including not only aluminum metal but also an alloy mainly composed of aluminum.

  When the external electrodes 14 and 15 are formed of a metal material that does not transmit ultraviolet rays, the portion where the external electrodes 14 and 15 are formed becomes a region where ultraviolet rays are not emitted, that is, the non-external electrode covering surface 53 on which no metal electrodes are formed, that is, Ultraviolet rays are emitted from the light (ultraviolet ray) radiating portion 18 which is an exposed surface of the side surface of the glass tube 11 without the external electrode. You may adhere | attach between the external electrodes 14 and 15 and the glass tube 11 via a silicone type adhesive agent. The external electrodes 14 and 15 may be provided by a method such as baking metal or printing metal on the outer peripheral surface 12 of the glass tube 11.

  The heat shrink film 17 fixes the external electrodes 14 and 15 to the outer peripheral surface 12 of the glass tube 11 and protects the external electrodes 14 and 15 by covering them with an insulating material. The heat-shrinkable film 17 is made of a resin material that can transmit ultraviolet rays emitted from the rare gas discharge lamp 1, and preferably uses a fluororesin. For example, a fluororesin tube made of PFA or a fluororesin tube made of FEP is used. PFA (Perfluorofluorofluoroplastics) is a fluororesin made of a copolymer of tetrafluoroethylene and perfluoroalkoxyethylene, and FEP (Fluorinated Ethylenepropylene) is a fluororesin made of a copolymer of trifluoroethylene and hexafluoropropylene. . These fluororesin tubes can be procured from the market as heat shrinkable tubes. The transmittance in the ultraviolet region of PFA is about 55% at a wavelength of 250 nm, about 70% at a wavelength of 300 nm, about 77% at a wavelength of 350 nm, and about 80% at a wavelength of 400 nm when the thickness is 0.04 mm. Indicates. The transmittance in the ultraviolet region of FEP also shows a high transmittance similar to that of PFA.

  As shown in FIG. 3, the heat shrinkable film 17 has an opening 19 at a position corresponding to the light emitting portion 18. In FIG. 3, four rectangular openings 19 are shown. FIG. 4A shows a cross section at a position where the opening 19 is not provided, and FIG. 4B shows a cross section at a position where the opening 19 is provided.

  As shown in FIG. 4 (A), at the position where the opening 19 is not provided, that is, in the circumferential covering portion A covered with the heat shrink film 17, all the outer peripheral surfaces of the external electrodes 14 and 15 are provided. And the entire outer periphery of the exposed surface of the glass tube 11 is covered with the heat shrink film 17. On the other hand, at the position where the opening 19 is provided, as shown in FIG. 4B, all the outer peripheral surfaces of the external electrodes 14 and 15 and a part of the exposed surface of the glass tube 11 are formed on the heat shrinkable film 17. The remaining outer peripheral surface 12 of the glass tube 11 is not covered with the heat shrink film 17 and the outer peripheral surface 12 is exposed. That is, most of the glass tube 11 is not covered with the heat shrinkable film 17 in a region other than the circumferential covering portion A where the opening 19 is not provided.

  In the circumferential covering portion A, the entire circumference in the circumferential direction of the glass tube 11 is covered with the heat shrink film 17, so that the external electrodes 14 and 15 are made of glass by heating and shrinking the heat shrink film 17. It is clamped with the tube 11 and fixed. Further, since the opening 19 is provided at the position where the heat shrink film 17 other than the circumferential covering portion A is provided, the absorption of ultraviolet rays by the heat shrink film 17 is reduced. Accordingly, the amount of emitted ultraviolet light can be increased.

Next, a coating method using the heat shrink film 17 will be described.
External electrodes 14 and 15 are arranged at predetermined positions on the outer peripheral surface 12 of the glass tube 11 in which a rare gas 13 is previously sealed. Thereafter, the tube-shaped heat shrink film 17 having the opening 19 is covered. At this time, the coating is performed so that the opening 19 is positioned at the light emitting portion 18. After coating the heat shrink film 17, the entire circumference of the glass tube 11 is heated to shrink the heat shrink film 17. The heat shrinkable film 17 is reduced in diameter toward the radial center of the glass tube 11, and is in close contact with the outer peripheral surface 12 of the glass tube 11 to fix the external electrodes 14 and 15. Note that the method of covering the heat shrink film 17 is not limited to the above-described method, and a method of heat shrinking after attaching a sheet-like heat shrink film with an adhesive or the like may be used.

  The description of the ultraviolet purification processing apparatus 100 will be continued with reference to FIGS. 2 and 5. FIG. 5 is a schematic cross-sectional view illustrating the relationship between the external electrode of the rare gas discharge lamp 10 and the ultraviolet light emission range.

  The light source installation part 50 is a space between the outer circumferential spiral channel 2 and the inner circumferential spiral channel 3 and has a substantially cylindrical shape. A plurality of rare gas discharge lamps 10 are arranged in a light source installation portion on a concentric circle centered on the jacket central axis X so that the straight tube center axis 54 of each rare gas discharge lamp 10 is parallel to the jacket central axis X. Has been placed. At this time, as shown in FIG. 2, the non-external electrode covering surface 53 on the side surface of each rare gas discharge lamp 10 faces the outer peripheral spiral channel 2 and the inner spiral channel 3, and the external electrodes 14, It arrange | positions so that 15 may not face the outer periphery side spiral flow path 2 and the inner periphery side spiral flow path 3. FIG. That is, as shown in FIG. 2, the non-external electrode covering surface 53 is disposed so as to be positioned on the inner peripheral side and the outer peripheral side of the cylindrical light source installation portion 50. In the present embodiment, the non-external electrode covering surface 53 corresponds to the light emitting portion 18 and the circumferential covering portion A.

  This arrangement is preferable because ultraviolet rays radiated from the rare gas discharge lamp 10 reach the outer circumferential spiral channel 2 and the inner circumferential spiral channel 3 without being shielded by the external electrodes 14 and 15. is there. For example, FIG. 5 shows a case where the external electrodes 14 and 15 are arranged so as to face the outer circumferential spiral channel 2 and the inner circumferential spiral channel 3 as a comparison. The shaded portion in FIG. 5 shows the region where the ultraviolet rays are not irradiated by the external electrodes for the four rare gas discharge lamps 10. When the external electrode of the rare gas discharge lamp is arranged as shown in FIG. 5, it can be seen that the water flowing through the spiral flow path alternately passes through the region that receives the ultraviolet irradiation and the region that does not. Since the sterilizing effect of the ultraviolet sterilization apparatus is determined by the amount of ultraviolet rays, that is, the product of the ultraviolet irradiance and the irradiation time, it is not preferable that many areas that are not subjected to ultraviolet irradiation are generated because the irradiation time is shortened.

  On the other hand, in the present embodiment, as shown in FIG. 2, the region where the ultraviolet rays are not irradiated by the external electrodes 14, 15, that is, the surface on which the external electrodes 14, 15 are formed faces the direction of the adjacent lamp. On the other hand, the region irradiated with ultraviolet rays has a structure facing the direction of the outer circumferential spiral channel 2 and the inner spiral channel 3. Therefore, since the to-be-processed water W is always in the state of receiving ultraviolet irradiation while flowing through the spiral flow path, the irradiation time can be made sufficiently long.

  In addition, since the spiral flow paths 2 and 3 can be arranged close to the two non-external electrode covering surfaces 53 of the rare gas discharge lamp, attenuation due to the distance of the ultraviolet rays can be reduced, and sufficient for water. UV irradiance can be provided. Further, since the spiral channels on both sides of the outer peripheral spiral channel 2 and the inner peripheral spiral channel 3 are formed, the channel can be made sufficiently long. Therefore, the irradiation time can be made sufficiently long, and the ultraviolet sterilizing effect can be enhanced with a compact configuration.

  Further, the rare gas discharge lamp 10 has the external electrodes 14 and 15 fixed at predetermined positions by the heat shrink film, and preferably uses a fluororesin compound. Thereby, attenuation | damping of the ultraviolet-ray radiated | emitted from a rare gas discharge lamp is suppressed, and an external electrode can be fixed easily and stably by fixing an external electrode stably. The positions of the opposing external electrodes 14 and 15 can also be adjusted according to the shape of the light source installation unit 50. For example, it may be unevenly distributed according to the curvature of the light source installation part 50 from a completely line-symmetrical position around the straight pipe part central axis 54.

Next, another embodiment will be described.
FIG. 6 is a schematic front view showing another configuration of the rare gas discharge lamp 20 used in the present invention. In the following description, the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted here.

The rare gas discharge lamp 20 includes a tubular glass tube 11, a rare gas 13 such as xenon filled in a sealed space inside the glass tube 11, and a pair of strip electrodes 14 and 15 provided on the outer periphery of the glass tube 11. When the noble gas discharge lamp 10 is turned on, it emits ultraviolet rays.
Further, in the present embodiment, a plurality of ultraviolet light transmissive heat shrinkable films 27 are provided on the outer periphery of the glass tube 11 in a ring shape with an interval in the tube length direction.

  The ring-shaped ultraviolet transmissive heat-shrinkable film 27 is formed of an insulating resin material that can transmit ultraviolet rays radiated from the rare gas discharge lamp 1, and preferably uses a fluororesin. The outer electrodes 14, 15 made of a pair of strip-shaped conductors that are shorter than the tube length of the glass tube 11 and are disposed over almost the entire length of the glass tube 11, and a plurality of portions between both side ends of the glass tube. The positions of the places are arranged so as to have an equally spaced pitch. In FIG. 3, five ring-shaped ultraviolet light permeable heat-shrink films 27 are provided.

  In such a rare gas discharge lamp 20, external electrodes 14 and 15 are arranged at predetermined positions on the outer peripheral surface 12 of the glass tube 11 in which the rare gas 13 is previously sealed. Thereafter, the heat-shrinkable film 27 having a ring shape is arranged with a predetermined interval. Thereafter, the entire circumference of the glass tube 11 is heated to shrink the heat shrinkable film 27. The heat-shrinkable film 27 contracts toward the radial center of the glass tube 11 and fixes the external electrodes 14 and 15. Therefore, a rare gas discharge lamp can be manufactured more easily, and the overall cost of the ultraviolet purification apparatus can be reduced as a whole.

  If this rare gas discharge lamp 20 is used in the ultraviolet purification apparatus 100 shown in FIGS. 1 and 2, the ultraviolet radiation emitted from the external electrode type rare gas discharge lamp can be reliably covered with a simple structure that can be practically used. Since it is possible to irradiate the treated water, extend the irradiation time, and increase the irradiance, an ultraviolet sterilization apparatus having a high sterilizing effect can be obtained.

By the way, the light emitted from the ultraviolet lamp is attenuated when it is separated from the lamp as the light source. The illuminance (dose rate) from the point light source decreases with the square of the distance from the light source, and the attenuated dose rate is expressed by I = S / 4π × 2. Here, I is the illuminance (dose rate) (μW / cm ² ), S is the energy of the light source (μW), and x is the distance (cm). As can be understood from this equation, in order to reduce the attenuation, it is preferable to provide the spiral flow paths 2 and 3 as close to the rare gas discharge lamp as possible.

In general, the water to be treated W is often at a lower temperature than the ultraviolet lamp. Therefore, when the water to be treated W passes near the ultraviolet lamp, the ultraviolet lamp is cooled by the water to be treated W. When the ultraviolet lamp is composed of a mercury discharge lamp, the output of ultraviolet rays is lowered particularly in a low temperature environment. On the other hand, in the ultraviolet purification processing apparatus 100 according to the present invention, a rare gas discharge lamp is used as the ultraviolet lamp. Therefore, the rare gas discharge lamp does not significantly reduce the output of ultraviolet rays particularly in a low-temperature environment as compared with the case of using an ultraviolet mercury lamp using mercury emission. Therefore, the spiral flow paths 2 and 3 can be provided closer to the light source than in the case of using an ultraviolet mercury lamp using mercury. Therefore, the attenuation of ultraviolet rays can be further reduced and the size can be reduced.
In addition, ultraviolet mercury lamps such as low-pressure mercury lamps use mercury as an excitation medium, so there are concerns about adverse environmental impacts during disposal. Can also be reduced.

  The above embodiment is merely an example in all respects. The present invention is not construed as being limited to these descriptions. For example, although the straight tubular glass tube 11 is used in the present embodiment, it may be a U-shaped glass tube. The present invention can be implemented in various other forms without departing from the spirit or main features thereof.

  According to the rare gas discharge lamp of the present invention, it is possible to provide an ultraviolet radiation light source in which the amount of ultraviolet radiation is less attenuated and the external electrode is securely fixed. Therefore, the present invention can be applied not only to an air cleaner and a surface cleaning device but also to various products using an ultraviolet light source.

DESCRIPTION OF SYMBOLS 1 Jacket 1a Inner surface 2 Outer peripheral side spiral flow path 3 Inner peripheral side spiral flow path 4 Connection part 5 Inlet 6 Outlet 8 Ultraviolet reflecting surface 10, 20 Noble gas discharge lamp 11 Glass tube 12 Outer surface 13 Noble gas 14, DESCRIPTION OF SYMBOLS 15 External electrode 16 Inner peripheral surface 17,27 Heat-shrink film | membrane 18 Light (ultraviolet rays) radiation | emission part 19 Aperture 50 Light source installation part 51 Upper surface 52 Lower surface 53 Non-external electrode covering surface 54 Straight pipe part central axis 55 Gas layer 100 Ultraviolet purification processing apparatus A Circumferential coating part 900 Sterilization device 901 Sterilization container 902 Low pressure mercury lamp 903 Flow path W Water to be treated X (jacket) central axis CA Central axis of the ultraviolet radiation part of the rare gas discharge lamp

Claims (3)

Ultraviolet purification provided with a cylindrical light source installation section, an inner peripheral spiral channel provided on the inner peripheral surface of the light source installation unit, and an outer spiral channel provided on the outer peripheral surface of the light source installation unit Processing,
In the light source installation part, a plurality of rare gas discharge lamps having a straight tubular ultraviolet radiation part are arranged so that the straight tubular ultraviolet radiation part is parallel,
The inner circumferential spiral channel and the outer spiral channel are formed of an ultraviolet transmitting material and are connected via a connecting portion provided on the upper surface side or the lower surface side of the light source installation unit,
The rare gas discharge lamp is an ultraviolet light emitting rare gas discharge lamp having a glass tube in which a rare gas is hermetically sealed and a pair of strip-shaped external electrodes provided to face the outer peripheral surface of the glass tube of the ultraviolet radiation portion. And a non-external electrode covering surface is opposed to the inner circumferential spiral channel and the outer circumferential spiral channel.   The ultraviolet purification processing apparatus according to claim 1, wherein a metal reflection wall is provided outside the outer peripheral spiral channel.   3. The ultraviolet purification apparatus according to claim 1, wherein the rare gas discharge lamp is sealed with 20 to 110 Torr of a gas mainly composed of xenon, and the external electrode is an aluminum electrode.

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