JP6244235B2 - Photocatalyst purification device - Google Patents

Description

  The present invention relates to a photocatalyst purification device.

A photocatalyst such as titanium oxide (TiO ₂ ) absorbs excitation light such as near ultraviolet rays and exhibits a strong redox action, and decomposes contaminants in the fluid by OH radicals generated by the oxidation action. In other words, the photocatalyst is excited by excitation light irradiation, and the fluid is purified by decomposing the contaminants in the fluid.

  A conventional photocatalyst purification apparatus includes an excitation light source provided at the center, an inner tube formed of a light guide surrounding the excitation light source, and an outer tube having a spiral projection provided on the inner peripheral surface. The photocatalyst layer is coat | covered on the internal peripheral surface of the pipe | tube (refer: patent document 1). In this case, the photocatalyst layer is excited by irradiating excitation light from the inner peripheral surface of the inner tube using an excitation light source. At this time, the oxidation-reduction action of the photocatalyst is only about 1 μm in surface depth of the photocatalyst. As a result, the purification capacity of the entire apparatus can be increased.

JP 2001-232357 A (Patent No. 3848515)

  However, in the above-described conventional photocatalyst purification device, the fluid stirring effect is only on the outer tube side, and the cross-sectional area of the flow path is reduced by the spiral protrusion, so that the area of the photocatalyst irradiated with excitation light is substantially small. As a result, there is a problem that the purification capacity of the entire apparatus is still low. In addition, if oil in the fluid adheres to the spiral projections, it is difficult to remove the oil, so that the light irradiation from the light source to the photocatalyst layer is blocked by the oil and the like. There is also a problem that the ability is reduced.

  In order to solve the above-mentioned problem, a photocatalytic purification device according to the present invention is provided in an excitation light incident portion for making excitation light incident and at least one first hollow tube region in the longitudinal direction of the device, A photocatalyst layer is formed at least on the inner peripheral surface, and is provided in a plurality of first hollow tubes transparent to excitation light and at least one second hollow tube region in the longitudinal direction of the device, and at least the inner periphery A photocatalyst layer is formed on the surface, and includes a plurality of second hollow tubes that are transparent to excitation light, and the first hollow tube regions and the second hollow tube regions are alternately arranged, The space between the first hollow tube region and the second hollow tube region is a hollow region.

  According to the present invention, while increasing the photocatalytic area of the photocatalyst layer of the hollow tube, the irradiation photocatalyst area can be substantially increased by the stirring effect due to the increase and decrease of the fluid resistance due to the cavity region. Ability can be increased. Further, even if oil or the like in the fluid adheres to the hollow tube and the tube wall in the hollow region, it is easily removed naturally, so that the purification capacity of the entire apparatus is hardly lowered.

It is an external appearance perspective view which shows 1st Embodiment of the photocatalyst purification apparatus which concerns on this invention. It is a longitudinal cross-sectional view of the photocatalyst purification apparatus of FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2. It is a longitudinal cross-sectional view which shows the example of a change of the cavity area | region of FIG. It is an external appearance perspective view which shows 2nd Embodiment of the photocatalyst purification apparatus which concerns on this invention. It is a longitudinal cross-sectional view of the photocatalyst purification apparatus of FIG. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. It is the IX-IX line transverse cross section of FIG. It is a longitudinal cross-sectional view which shows the example of a change of FIG. It is the XI-XI line cross-sectional view of FIG. It is an external appearance perspective view which shows 3rd Embodiment of the photocatalyst purification apparatus which concerns on this invention. It is a longitudinal cross-sectional view of the photocatalyst purification apparatus of FIG. It is the XIV-XIV line cross-sectional view of FIG. It is the XV-XV line cross-sectional view of FIG.

  FIG. 1 is an external perspective view showing a first embodiment of a photocatalytic purification device according to the present invention.

  In FIG. 1, an inner tube 1 and an outer tube 2 formed of a light guide are provided, a fluid inlet IN is provided on the upstream side in the longitudinal direction of the outer tube 2, and a downstream side in the longitudinal direction of the outer tube 2. On the side, a fluid outlet OUT is provided. Here, the inner tube 1 has an inner diameter of 41 mm, an outer diameter of 45 mm, and a thickness of 2 mm, for example, and the outer tube 2 has an inner diameter of 65 mm, an outer diameter of 70 mm, and a thickness of 2.5 mm. The inner tube 1 is for housing an excitation light source 5 to be described later. Therefore, the inner peripheral surface of the inner tube 1 becomes an excitation light incident portion P to be described later.

  As shown in FIG. 2 which is a longitudinal sectional view of the photocatalyst purification device of FIG. 1, the hollow tube regions Ra and Rb are alternately arranged, and a hollow region Rc is provided between them.

Referring to FIG. 3 which is a cross-sectional view taken along the line III-III in FIG. 2, in the hollow tube region Ra, the inner diameters Da ₁ and Da ₂ (Da ₁ > Da ₂ ) are arranged between the inner tube 1 and the outer tube 2. The hollow tubes 3a-1 and 3a-2 having the above are arranged in the longitudinal direction. For example, the hollow tube 3a-1 has an inner diameter of 3 mm (= Da ₁ ), an outer diameter of 5 mm, and a thickness of 1 mm, and the hollow tube 3a-2 has an inner diameter of 2 mm (= Da ₂ ), an outer diameter of 3 mm, and a thickness. 0.5mm. Moreover, the density of the hollow tube 3a-2 is made larger than the density of the hollow tube 3a-1 to compensate for the decrease in the flow rate of the fluid. Furthermore, as shown by a thick solid line, the photocatalyst layer 4 is coated on the inner and outer peripheral surfaces of the hollow tubes 3a-1 and 3a-2. However, the photocatalyst layer 4 may be coated on at least the inner peripheral surfaces of the hollow tubes 3a-1, 3a-2.

Referring to FIG. 4, which is a cross-sectional view taken along line IV-IV in FIG. 2, in the hollow tube region Rb, the inner diameters Db ₁ and Db ₂ (Db ₁ <Db ₂ ) are placed between the inner tube 1 and the outer tube 2. The hollow tubes 3b-1 and 3b-2 having are arranged in the longitudinal direction. For example, the hollow tube 3b-1 has an inner diameter of 2 mm (= Db ₁ ), an outer diameter of 3 mm, and a thickness of 0.5 mm, and the hollow tube 3b-2 has an inner diameter of 3 mm (= Db ₂ ), an outer diameter of 5 mm, and a thickness. It is 1mm. Further, the density of the hollow tube 3b-1 is made larger than the density of the hollow tube 3b-2 to compensate for the decrease in the flow rate of the fluid. Furthermore, as shown by the thick solid line, the photocatalyst layer 4 is coated on the inner and outer peripheral surfaces of the hollow tubes 3b-1, 3b-2. However, also in this case, the photocatalyst layer 4 should just coat | cover the inner peripheral surface of each hollow tube 3b-1, 3b-2.

  2, 3, and 4, an excitation light source 5 for exciting the photocatalyst layer 4 is provided at the center of the inner tube 1. Therefore, as described above, the inner peripheral surface of the inner tube 1 is excited. It becomes the light incident part P. A reflection layer 6 made of Al or the like is formed on the outer peripheral surface of the outer tube 2 to reflect the excitation light L from the excitation light source 5 and effectively confine it in the apparatus.

The photocatalyst layer 4 is made of, for example, titanium oxide (TiO ₂ ) having an anatase structure with high activity, and can be formed by a liquid phase growth method using ammonium titanate. In this case, if the photocatalyst layer 4 is formed before the hollow tubes 3a-1, 3a-2, 3b-1, 3b-2 are arranged between the inner tube 1 and the outer tube 2, each hollow tube It can be formed only on the inner peripheral surface of 3a-1, 3a-2, 3b-1, 3b-2. On the other hand, if each photocatalyst layer 4 is formed after arranging each hollow tube 3a-1, 3a-2, 3b-1, 3b-2 between the inner tube 1 and the outer tube 2, each hollow tube 3a- 1, 3 a-2, 3 b-1, and 3 b-2, the outer peripheral surface of the inner tube 1, and the inner peripheral surface of the outer tube 2. 3 and 4 illustrate the latter case. In addition to the liquid phase growth method, the photocatalyst layer 4 can be formed by adhesion of a photocatalyst material with a binder, a coating method with a resin kneaded with a photocatalyst, or a sol-gel method.

  When the photocatalyst layer 4 is formed of titanium oxide, near ultraviolet light having a wavelength of 365 nm or less is required for the excitation light L of the excitation light source 5. For example, a black light lamp (for example, model name FL20SBL manufactured by Sankyo Electric Co., Ltd.) having a tube diameter of 32.5 mm and a length of 580 mm is used as the excitation light source 5 that generates the near ultraviolet light. When the photocatalyst layer 4 is formed of a visible light responsive photocatalyst, a visible light source is used as the excitation light source 5.

  The inner tube 1, the outer tube 2 and the hollow tubes 3 a-1, 3 a-2, 3 b-1 and 3 b-2 are made of a base material that is transparent to the excitation light L of the excitation light source 5. As such a base material, for example, borosilicate glass or quartz may be used, but low alkali glass, alkali-free glass having a low alkali metal content that does not lower the photocatalytic activity of titanium oxide, silicon oxide so that alkali metal does not elute. Alkaline glass coated with is preferred. Further, the inner tube 1, the outer tube 2, and the hollow tubes 3a-1, 3a-2, 3b-1, 3b-2 may be in contact with each other, but are in a fused state to promote light guide. preferable. In this case, annealing is performed by heating to the softening point or melting point of the base material. For example, borosilicate glass is annealed at 525 ° C. or higher.

  In the photocatalyst purification apparatus shown in FIGS. 1 to 4, the photocatalyst layer 4 is provided on at least the inner peripheral surface of the hollow tubes 3a-1, 3a-2, 3b-1, 3b-2 in the hollow tube regions Ra and Rb. The hollow tubes 3a-1, 3a-2, 3b-1, due to the stirring effect due to the increase and decrease of the fluid resistance due to the cavity region Rc between the hollow tube regions Ra and Rb while effectively increasing the photocatalytic area The purification ability of 3b-2 can be substantially improved.

Further, the large inner diameter Da ₁ of the hollow tube 3a-1 in the hollow tube region Ra faces the small inner diameter Db ₁ of the hollow tube 3b-1 in the hollow tube region Rb through the hollow region Rc, while smaller inner diameter Da ₂ of the hollow tube 3a-2 of the air duct region Ra is opposed to the larger inner diameter Db ₂ of the hollow tube 3b-2 of the hollow tube region Rb via the cavity region Rc. As a result, even the fluid passing through the hollow tube 3a-1 of the larger inner diameter Da ₁ trying Komimo flow into the hollow tube 3b-1 of the smaller inner diameter Db _1, the amount Komu flow of fluid is reduced, the resistance of the fluid To increase. Conversely, the fluid passing through the hollow tube 3a-2 of the smaller inner diameter Da ₂ when trying Komimo flow into the hollow tube 3b-2 of the larger inner diameter Db _2, the amount Komu flow of the fluid increases, the fluid resistance Decrease. Therefore, the fluid cannot go straight in the cavity region Rc and is further stirred in the cavity region Rc. As a result, the purification ability of the hollow tubes 3a-1, 3a-2, 3b-1, 3b-2 can be further improved.

  In FIG. 2, the cavity regions Rc are arranged at equal intervals in axial symmetry with respect to the excitation light source 5 (longitudinal central axis), but can be formed in various shapes as shown in FIG. For example, as shown in FIG. 5A, the hollow regions Rc are inclined at the same interval with respect to the central axis in the longitudinal direction. Further, as shown in FIG. 5B, the hollow regions Rc are alternately inclined with respect to the central axis in the longitudinal direction and arranged at equal intervals. Further, as shown in FIGS. 5C and 5D, the cavity region Rc is made asymmetric with respect to the longitudinal central axis.

  In FIG. 2, the hollow tubes in each of the hollow tube regions Ra and Rb are grouped into two groups, but three or more groups may be used. In addition, the inner tube 1 can be enlarged to increase the excitation light source 5 to 2 or more.

  FIG. 6 is an external perspective view showing a second embodiment of the photocatalytic purification device according to the present invention.

  In FIG. 6, without providing the inner tube 1 for accommodating the excitation light source of FIG. 1, excitation light sources 5′-1, 5′-2,. Provided. Accordingly, the outer peripheral surface of the outer tube 2 'becomes the excitation light incident part P'.

  As shown in FIG. 7 which is a longitudinal sectional view of the photocatalyst purification apparatus of FIG. 6, the hollow tube regions Ra 'and Rb' are alternately arranged, and a cavity region Rc 'is provided between them. The number of excitation light sources 5'-1, 5'-2, ..., 5'-8 on the outer peripheral surface side of the outer tube 2 'can be other than eight. Moreover, the reflective layer 6 of FIG. 2 does not exist.

Referring to FIG. 8, which is a cross-sectional view taken along the line VIII-VIII of FIG. 7, in the hollow tube region Ra ′, inside diameters Da ′ ₁ , Da ′ ₂ , Da ′ ₃ , Da ′ are arranged inside the outer tube 2 ′. ₄ , Da ' ₅ (Da' ₁ <Da ' ₂ <Da' ₃ <Da ' ₄ <Da' ₅ ) hollow tubes 3a'-1, 3a'-2, 3a'-3, 3a'-4 3a′-5 is arranged in the longitudinal direction. For example, the hollow tube 3a′-1 has an inner diameter of 1 mm (= Da ′ ₁ ), an outer diameter of 3 mm, and a thickness of 2 mm, and the hollow tube 3a′-2 has an inner diameter of 2 mm (= Da ′ ₂ ) and an outer diameter. The hollow tube 3a'-3 has an inner diameter of 3 mm (= Da ' ₃ ), an outer diameter of 6 mm, and a thickness of 1.5 mm. The hollow tube 3a'-4 has an inner diameter of 4 mm (= Da ′ ₄ ), the outer diameter is 7 mm, and the thickness is 1.5 mm. The hollow tube 3a′-5 has an inner diameter of 5 mm (= Da ′ ₅ ), an outer diameter of 10 mm, and a thickness of 2.5 mm. Further, the density of the hollow tubes 3a′-5, 3a′-4, 3a′-3, 3a′-2, 3a′-1 is increased in this order to compensate for a decrease in the flow rate of the fluid. Furthermore, as shown by a thick solid line, the photocatalyst layer 4 is coated on the inner and outer peripheral surfaces of the hollow tubes 3a′-1, 3a′-2, 3a′-3, 3a′-4, 3a′-5. . However, the photocatalyst layer 4 should just coat | cover the inner peripheral surface of each hollow tube 3a'-1, 3a'-2, 3a'-3, 3a'-4, 3a'-5. Furthermore, 3'a is a dummy light guide.

Referring to FIG. 9, which is a cross-sectional view taken along the line IX-IX in FIG. 7, in the hollow tube region Rb ′, the inner diameters Db ′ ₁ , Db ′ ₂ , Db ′ ₃ , Db ′ ₄ are formed inside the outer tube 2. , Db ′ ₅ (Db ′ ₁ > Db ′ ₂ > Db ′ ₃ > Db ′ ₄ > Db ′ ₅ ) hollow tubes 3b′-1, 3b′-2, 3b′-3, 3b′-4, 3b'-5 is arrange | positioned in the longitudinal direction. For example, the hollow tube 3b′-1 has an inner diameter of 5 mm (= Db ′ ₁ ), an outer diameter of 10 mm, and a thickness of 2.5 mm, and the hollow tube 3b′-2 has an inner diameter of 4 mm (= Db ′ ₂ ), outer diameter 7 mm, a thickness of 1.5 mm, the hollow tube 3b '-3, an inner diameter 3mm (= Db' _3), an outer diameter of 6 mm, a thickness of 1.5 mm, a hollow tube 3b '-4 has an inner diameter 2mm (= Db ′ ₄ ), outer diameter 4 mm, thickness 1 mm, hollow tube 3 b′-5 has an inner diameter 1 mm (= Db ′ ₅ ), outer diameter 3 mm, and thickness 2 mm. Further, the density of the hollow tubes 3b'-1, 3b'-2, 3b'-3, 3b'-4, 3b'-5 is increased in this order to compensate for a decrease in the flow rate of the fluid. Furthermore, as shown by a thick solid line, the photocatalyst layer 4 is coated on the inner and outer peripheral surfaces of the hollow tubes 3b'-1, 3b'-2, 3b'-3, 3b'-4, 3b'-5. . However, the photocatalyst layer 4 should just coat | cover at least the inner peripheral surface of each hollow tube 3b'-1, 3b'-2, 3b'-3, 3b'-4, 3b'-5. Furthermore, 3'b is a dummy light guide.

7, 8, and 9, the photocatalyst layer 4 is made of, for example, titanium oxide (TiO ₂ ) having an anatase structure with high activity, and can be formed by a liquid phase growth method using ammonium titanate. In this case, each hollow tube 3a'-1, 3a'-2, 3a'-3, 3a'-4, 3a'-5, 3b'-1, 3b'-2, 3b'-3, 3b'- If the photocatalyst layer 4 is formed before disposing 4, 3b′-5 inside the outer tube 2, each hollow tube 3a′-1, 3a′-2, 3a′-3, 3a′-4, 3a '-5, 3b'-1, 3b'-2, 3b'-3, 3b'-4, 3b'-5 can be formed only on the inner peripheral surface. On the other hand, each hollow tube 3a'-1, 3a'-2, 3a'-3, 3a'-4, 3a'-5, 3b'-1, 3b'-2, 3b'-3, 3b'-4 If the photocatalyst layer 4 is formed after 3b′-5 is arranged inside the outer tube 2, each hollow tube 3a′-1, 3a′-2, 3a′-3, 3a′-4, 3a′− 5, 3b′-1, 3b′-2, 3b′-3, 3b′-4, 3b′-5 and the inner peripheral surface of the outer tube 2. 8 and 9 illustrate the latter case. In this case as well, the photocatalyst layer 4 can be formed not only by the liquid phase growth method but also by a photocatalyst material adhesion by a binder, a coating method by a resin kneaded with a photocatalyst, or a sol-gel method.

  When the photocatalyst layer 4 is formed of titanium oxide, near ultraviolet light having a wavelength of 365 nm or less is required for the excitation light L of the excitation light sources 5'-1, 5'-2, ..., 5'-8. As the excitation light sources 5′-1, 5′-2,..., 5′-8 that generate near ultraviolet light, for example, a black light lamp having a tube diameter of 32.5 mm and a length of 580 mm (for example, model name FL20SBL manufactured by Sankyo Electric Co., Ltd. ) Is used. When the photocatalyst layer 4 is formed of a visible light responsive photocatalyst, a visible light source is used as the excitation light sources 5'-1, 5'-2, ..., 5'-8.

  Outer tube 2 'and hollow tube 3a'-1, 3a'-2, 3a'-3, 3a'-4, 3a'-5, 3b'-1, 3b'-2, 3b'-3, 3b' -4 and 3b'-5 are composed of a base material transparent to the excitation light L of the excitation light sources 5'-1, 5'-2, ..., 5'-8.

  Also in the photocatalyst purification apparatuses shown in FIGS. 6 to 9, the hollow tubes 3a′-1, 3a′-2, 3a′-3, 3a′-4, 3a′-5 in the hollow tube regions Ra ′ and Rb ′ are used. 3b'-1, 3b'-2, 3b'-3, 3b'-4, 3b'-5 is provided with the photocatalyst layer 4 on at least the inner peripheral surface to effectively increase the photocatalyst area, and the hollow tube region The hollow tube 3a'-1, 3a'-2, 3a'-3, 3a'-4, 3a'-5, 3b'-1 is obtained by the stirring effect of the fluid by the hollow region Rc 'between Ra' and Rb '. The purifying ability of 3b′-2, 3b′-3, 3b′-4, 3b′-5 can be substantially improved.

Further, the inner diameters Da ′ ₁ , Da ′ ₂ ,..., Da ′ of the hollow tubes 3a′- ₁ , 3a′- ₂ , 3a′-3, 3a′-4, 3a′-5 in the hollow tube region Ra ′. ₅ denotes the inner diameters Db ′ ₁ and Db of the hollow tubes 3b′- ₁ , 3b′-2, 3b′-3, 3b′-4, and 3b′-5 in the hollow tube region Rb ′ through the hollow region Rc ′. ' ₂ , ..., Db' ₅ is supported. Thus, for example, when a small inner diameter Da 'fluid passing through the hollow tube 3a'-1 of ₁ larger inner diameter Db 'tried Komimo flow into the hollow tube 3b'-1 of _1, the amount Komu flow of fluid increases However, the resistance of the fluid is reduced. Conversely, larger inner diameter Db 'fluid passing through the hollow tube 3b'-1 ₁ a small inner diameter Da 'even if Komimo flow into the hollow tube 3a'-1 of _1, the amount Komu flow of fluid is reduced, The resistance of the fluid increases. Therefore, the fluid cannot go straight in the cavity region Rc ′ and is further stirred in the cavity region Rc ′. As a result, the hollow tubes 3a'-1, 3a'-2, 3a'-3, 3a'-4, 3a'-5, 3b'-1, 3b'-2, 3b'-3, 3b'-4 The purification ability of 3b′-5 can be further improved.

  In FIG. 7, the hollow tubes are grouped into five groups, but two to four, six or more groups may be used. Also, the cavity region Rc ′ can be formed in various shapes as in FIG.

  FIG. 10 is a longitudinal sectional view showing a modified example of the photocatalytic purification device of FIG. 7, and FIG. 11 is a transverse sectional view taken along the line XI-XI of FIG. Note that the cross-sectional view of the hollow tube region Rb 'in FIG.

  10 and 11, sunlight is used instead of the excitation light sources 5'-1, 5'-2,..., 5'-8 in FIGS. If sunlight is irradiated from above the device, a reflector 9 is provided on the lower side of the device. Thereby, the purification | cleaning capability of the whole apparatus is improved so that sunlight may be irradiated also from the downward direction of an apparatus.

  As the reflective material of the reflector 9, a material that reflects visible light from ultraviolet light including near ultraviolet light such as aluminum, silver, or a silver alloy is used. The reflector 9 has a cross-sectional shape such as a circle, an ellipse, or a multi-face so as to uniformly reflect. Further, the surface of the reflector 9 may be a mirror surface or a scattering surface for reflection. In this case, the reflecting surface material of the reflector 9 may scatter visible light from ultraviolet light including near ultraviolet light such as quartz, silica, alumina, aluminum nitride, and titanium oxide.

  FIG. 12 is an external perspective view showing a third embodiment of the photocatalytic purification device according to the present invention. This photocatalyst purification apparatus utilizes sunlight, as in FIGS. In FIG. 12, the upper surface of the flat outer tube 2 ″ is the excitation light incident portion P ″.

  As shown in FIG. 13 which is a longitudinal sectional view of the photocatalyst purification apparatus of FIG. 12, the hollow tube regions Ra ″ and Rb ″ are alternately arranged, and a hollow region Rc ″ is provided between them. In this case, if the sunlight is irradiated from above the device, the outer tube 2 ″ is sufficiently flat, so that it is not necessary to provide a reflector on the lower side of the device.

Referring to FIG. 14, which is a cross-sectional view taken along the line XIV-XIV in FIG. 13, in the hollow tube region Ra ″, inside the outer tube 2 ″, the inner diameters Da ″ ₁ , Da ″ ₂ , Da ″ ₃ , Da ″ ₄ , hollow tube 3a "-1, 3a" -2, 3a "-3, 3a" -4 with Da " ₅ (Da" ₁ <Da " ₂ <Da" ₃ <Da " ₄ <Da" ₅ ) Are arranged in the longitudinal direction. For example, the hollow tube 3a "-1 has an inner diameter of 1 mm (= Da" ₁ ), an outer diameter of 3 mm, and a thickness of 2 mm. The hollow tube 3a "-2 has an inner diameter of 2 mm (= Da" ₂ ) and an outer diameter. The hollow tube 3a ″ -3 has an inner diameter of 3 mm (= Da ″ ₃ ), an outer diameter of 6 mm, and a thickness of 1.5 mm. The hollow tube 3a ″ -4 has an inner diameter of 4 mm (= Da " ₄ ), outer diameter 7mm, thickness 1.5mm, hollow tube 3a" -5 has inner diameter 5mm (= Da " ₅ ), outer diameter 10mm, thickness 2.5mm. Further, the density of the hollow tubes 3a "-4, 3a" -3, 3a "-2, 3a" -1 is increased in this order to compensate for a decrease in the flow rate of the fluid. Furthermore, as shown by a thick solid line, the photocatalyst layer 4 is coated on the inner and outer peripheral surfaces of the hollow tubes 3a ″ -1, 3a ″ -2, 3a ″ -3, 3a ″ -4, 3a ″ -5. However, the photocatalyst layer 4 may be coated on at least the inner peripheral surface of each hollow tube 3a ″ -1, 3a ″ -2, 3a ″ -3, 3a ″ -4, 3a ″ -5.

Referring to FIG. 15, which is a cross-sectional view taken along the line XV-XV in FIG. 13, in the hollow tube region Rb ″, inside the outer tube 2 ″, the inner diameters Db ″ ₁ , Db ″ ₂ , Db ″ ₃ , Db ″ ₄ , hollow tube 3b "-1, 3b" -2, 3b "-3, 3b" -4 with Db " ₅ (Db" ₁ > Db " ₂ >Db" ₃ > Db " ₄ >Db" ₅ ) 3b ″ -5 is arranged in the longitudinal direction. For example, the hollow tube 3b ″ -1 has an inner diameter of 5 mm (= Db ″ ₁ ), an outer diameter of 10 mm, and a thickness of 2.5 mm. -2 has an inner diameter of 4 mm (= Db " ₂ ), an outer diameter of 7 mm, and a thickness of 1.5 mm. The hollow tube 3b" -3 has an inner diameter of 3 mm (= Db " ₃ ), an outer diameter of 6 mm, and a thickness of 1.5 mm. The hollow tube 3b ″ -4 has an inner diameter of 2 mm (= Db ″ ₄ ), an outer diameter of 4 mm, and a thickness of 1 mm. The hollow tube 3b ″ -5 has an inner diameter of 1 mm (= Db ″ ₅ ), an outer It has a diameter of 3 mm and a thickness of 2 mm.The density of the hollow tubes 3b "-1, 3b" -2, 3b "-3, 3b" -4, 3b "-5 is in this order. It increased to compensate the decrease of the flow rate of the fluid. Furthermore, as shown by a thick solid line, the photocatalyst layer 4 is coated on the inner and outer peripheral surfaces of the hollow tubes 3b "-1, 3b" -2, 3b "-3, 3b" -4, 3b "-5. However, the photocatalyst layer 4 may be coated on at least the inner peripheral surface of each hollow tube 3b ″ -1, 3b ″ -2, 3b ″ -3, 3b ″ -4, 3b ″ -5.

  In the photocatalyst purification apparatus shown in FIGS. 12 to 15, the hollow tubes 3a ″ -1, 3a ″ -2, 3a ″ -3, 3a ″ -4, 3a ″ -5 in the hollow tube regions Ra ″ and Rb ″. 3b ″ -1, 3b ″ -2, 3b ″ -3, 3b ″ -4, 3b ″ -5 is provided with the photocatalyst layer 4 on at least the inner peripheral surface to effectively increase the photocatalyst area, and the hollow tube region The hollow tube 3a "-1, 3a" -2, 3a "-3, 3a" -4, 3a "-5, 3b" -1 due to the fluid stirring effect by the cavity region Rc "between Ra" and Rb " The purification ability of 3b ″ -2, 3b ″ -3, 3b ″ -4, 3b ″ -5 can be substantially improved.

In addition, the inner diameters Da ″ ₁ , Da ″ ₂ ,..., Da ″ of the hollow tubes 3 a ″ -1, 3a ″ -2, 3a ″ -3, 3a ″ -4, 3a ″ -5 in the hollow tube region Ra ″. ₅ denotes an inner diameter Db ″ ₁ , Db of the hollow tube 3b ″ -1, 3b ″ -2, 3b ″ -3, 3b ″ -4, 3b ″ -5 of the hollow tube region Rb ″ through the hollow region Rc ″. _"2, ..., Db" corresponds to _5. Thus, for example, to -1 "hollow tube 3b of _1" fluid which has passed through the -1 "hollow tubes 3a _1" smaller inner diameter Da is larger inner diameter Db When attempting to flow, the amount of fluid flowing increases and the resistance of the fluid decreases. Conversely, the fluid passing through the hollow tube 3b "-1 having a large inner diameter Db" ₁ has a small inner diameter Da " ₁ . Even if it tries to flow into the hollow tube 3a ″ -1, the amount of fluid flowing in decreases and the resistance of the fluid increases. Therefore, the fluid cannot go straight in the cavity region Rc ″, and the cavity region Rc ″. To be further stirred in As a result, the hollow tubes 3a "-1, 3a" -2, 3a "-3, 3a" -4, 3a "-5, 3b" -1, 3b "-2, 3b" -3, 3b " -4, 3b "-5 purification ability can be further improved.

  13, 14, and 15, the hollow tubes are grouped into five groups, but may be composed of 2, 3, 4, 6, or more groups. Further, the cavity region Rc ″ can have various shapes as in the case of FIG.

  In the above-described embodiment, the inside diameter and density of the hollow tubes in the hollow tube regions Ra, Ra ′, Ra ″ and the hollow tube regions Rb, Rb ′, Rb ″ are determined by the excitation light incident portions P, P ′, P The hollow tube and the hollow tube of at least one pair of hollow tube regions Ra, Ra ′, Ra ”that are changed according to the distance from“ but are opposed to each other through the hollow regions Rc, Rc ′, Rc ” The inner diameters of the hollow tubes in the regions Rb, Rb ′, Rb ″ may be different.

  Furthermore, the present invention can apply any modification of the obvious range of the above-described embodiment.

  The photocatalyst purification apparatus according to the present invention can be used for an air purification apparatus, a hydrogen generation apparatus, a deodorization apparatus and the like in addition to the water purification apparatus.

1 ... Inner tube 2, 2 ', 2 "... Outer tube 3a-1, 3a-2, 3b-1, 3b-2, 3a'-1, 3a'-2, 3a'-3, 3a '-4, 3a'-5, 3b'-1, 3b'-2, 3b'-3, 3b'-4, 3b'-5, 3a "-1, 3a" -2, 3a "-3, 3a "-4, 3a" -5, 3b "-1, 3b" -2, 3b "-3, 3b" -4, 3b "-5, ... hollow tube 3'a ... dummy light guide 4 ... Photocatalyst layer 5, 5'-1, 5'-2, ... 5'-8 ... Excitation light source 6 ... Reflective layer 7 ... Reflector 8 ... Light guide
IN ... Inlet
OUT ... Outlet
L ... Excitation light
P, P ', P ”... excitation light entrance

Claims (12)

A photocatalyst purification device,
An excitation light incident part for entering the excitation light;
A plurality of first hollow tubes that are provided in at least one first hollow tube region in the longitudinal direction of the device, have a photocatalyst layer formed on at least an inner peripheral surface, and are transparent to the excitation light;
A plurality of second hollow tubes which are provided in at least one second hollow tube region in the longitudinal direction of the device, have a photocatalyst layer formed on at least an inner peripheral surface, and are transparent to the excitation light. The first hollow tube region and the second hollow tube region are alternately arranged, and a cavity region is provided between the first hollow tube region and the second hollow tube region. Photocatalyst purification device.   2. The inner diameters of at least one set of the hollow tube in the first hollow tube region and the hollow tube in the second hollow tube region that face each other through the hollow region are different from each other. Photocatalyst purification device. In the first hollow tube region, the farther from the excitation light incident part, the thinner the inner diameter of the first hollow tube at a distance from the excitation light incident part,
2. The photocatalyst purification device according to claim 1, wherein in the second hollow tube region, the inner diameter of the second hollow tube at a distance from the excitation light incident part is increased as the distance from the excitation light incident part increases. . In the first hollow tube region, the further away from the excitation light incident part, the higher the density of the first hollow tube at a distance from the excitation light incident part,
4. The density of the second hollow tube according to claim 3, wherein in the second hollow tube region, the density of the second hollow tube at a distance from the excitation light incident part is further decreased as the distance from the excitation light incident part increases. Photocatalytic purification device.   The photocatalyst purification apparatus according to claim 1, wherein the hollow region is arranged symmetrically with respect to a central axis in a longitudinal direction of the apparatus.   The photocatalyst purification device according to claim 1, wherein the hollow region is disposed so as to be inclined in the same direction with respect to a longitudinal central axis of the device.   The photocatalyst purification device according to claim 1, wherein the hollow regions are alternately inclined with respect to a longitudinal central axis of the device.   The photocatalyst purification apparatus according to claim 1, wherein the hollow region is disposed asymmetrically with respect to a longitudinal central axis of the apparatus.   The photocatalyst purification apparatus according to claim 1, wherein the excitation light incident part is provided inside the apparatus.   Furthermore, the photocatalyst purification apparatus of Claim 9 which comprises the excitation light source provided in the inside of the said apparatus.   The photocatalyst purification apparatus according to claim 1, wherein the excitation light incident portion is provided on an outer peripheral surface of the apparatus. Furthermore, the photocatalyst purification apparatus of Claim 11 which comprises the excitation light source provided in the outer peripheral surface side of the said apparatus.

Images