JP2001054787A - Water cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently decompose harmful material by a photocatalyst. SOLUTION: This device is provided with an inflow port 8 and an outflow port 7 of water to be treated at the right places of a hollow cylindrical case 1, and also with the photocatalyst 17... for cleaning the water to be treated and a lamp 21 for irradiating the photocatalyst 17... with UV rays in the case 1. In this case, the inside of the case 1 is divided into a front room communicated with the inflow port 8, an irradiation room housing the lamp 21, and a rear room communicated with the outflow port 7, and also the photocatalyst 17... are arranged in the front room, the irradiation room and a communicative portion of the irradiation room with the rear room.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purification device for purifying harmful substances contained in drinking water, bath water and the like by decomposing and removing them with a photocatalyst.

[0002]

2. Description of the Related Art A method of decomposing harmful substances such as trihalomethane and trichloroethylene contained in drinking water and bath water using a photocatalyst is disclosed in, for example, Japanese Patent Application Laid-Open No. H10-174968.
In the case of the former configuration, the water to be treated supplied from the inlet 4 into the cartridge 11 passes through the photocatalyst only once and is purified. Therefore, there is a problem that the treatment rate of harmful substances contained in the water to be treated is low.

In the latter configuration, since the photocatalyst 3 is coated only on the inner wall surface of the main body container 2a, only a part of the photocatalyst which flows into the main body container from the inflow pipe 1 contacts the photocatalyst. There is a problem that the removal rate of harmful substances is low.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the contact efficiency between water to be treated and a photocatalyst, and to improve the removal rate of harmful substances by the photocatalyst.

[0005]

SUMMARY OF THE INVENTION The present invention provides an inflow port and an outflow port of water to be treated at appropriate locations in a hollow cylindrical case, and a photocatalyst for purifying the water to be treated in the case; In a lamp provided with a lamp for irradiating ultraviolet rays, the inside of the case is divided into a front chamber communicating with the inflow port, an irradiation chamber storing the lamp, and a rear chamber communicating with the outflow port, and the front chamber is irradiated with the light. A photocatalyst is provided in the chamber and in a portion where the irradiation chamber communicates with the rear chamber.

Further, in the present invention, the photocatalyst is arranged concentrically on the lamp.

Further, in the present invention, the inflow port and the outflow port are arranged on a substantially diagonal line avoiding a position where the case faces the photocatalyst.

Further, according to the present invention, the case is formed in a substantially cylindrical shape with a material having a high light reflection efficiency such as stainless steel or aluminum, and the photocatalyst is arranged along the inner surface of the case.
In addition, the lamp is arranged substantially at the center of the case.

Further, in the present invention, the photocatalyst is constituted by a plurality of divided structures, and the width of this structure is set to be equal to or less than the diameter of the lamp.

Further, according to the present invention, the front chamber, the irradiation chamber, and the rear chamber are each divided into a plurality of parts by partition walls in the axial direction of the case.
As the water to be treated that has flowed into the front chamber from the inlet, bends inside the case, passes through each chamber, and drains from the outlet,
A communication hole that communicates chambers adjacent to each other at an appropriate position on the partition wall is formed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 4. Reference numeral 1 denotes a substantially cylindrical case formed of a material having high light reflection efficiency such as stainless steel or aluminum, and has a substantially sectional shape. The semi-circular upper case 2 and lower case 3 are joined at their joints with screws 5 at flanges 4 formed at the joints thereof, and both ends thereof are closed with end face members 6. In addition, an outlet 7 and an inlet 8 are provided at diagonal positions of one end of the upper surface of the upper case 2 and the other end of the lower surface of the lower case.

Numerals 9 and 10 denote an upper partition plate and a lower partition plate which are arranged concentrically with the case with a gap serving as a flowing water channel provided on the inner surface of the case 1, and each of them has a semicircular shape, and a joint portion thereof. The flanges 11, 11 bent together are fastened together to the flanges 4, 4 of the case 1, whereby the gap is connected to the front chamber 12 communicating with the inlet 8 and the rear chamber 13 communicating with the outlet 7. An irradiation chamber 14 is formed in each of these partitioning plates while being partitioned.

The partition plates 9 and 10 are bent into a polygonal shape so as to continuously form a plurality of substantially flat plane portions 15..., And through holes 16.
And TiO ₂ , SnO ₂ , WO
_3. One lattice supporting photocatalysts 17 such as ZnO has a square cross-sectional shape, and a plurality of honeycomb structures 18 having a rectangular overall shape are arranged side by side, and the partition plate is further arranged. End faces 9 and 10 are closed by end plates 19 and 19 disposed inside the end face members 6 and 6, respectively.

The axial size of the honeycomb structure 18 or the case 1 is set so that the outflow port 7 or the inflow port 8 does not face the honeycomb structure 18.

The sectional shape of the lattice of the honeycomb structures 18 is not limited to a square, but may be a circle or another polygon.

Reference numeral 20 denotes a lamp accommodating pipe made of a material that transmits ultraviolet light, such as a quartz glass tube, which is mounted in a substantially central portion of the case 1 in an axial direction and has both ends opened.

Reference numeral 21 denotes an ultraviolet lamp having a diameter of, for example, about 13 mm, which is housed and arranged in the lamp housing pipe 20, and is composed of a mercury lamp, a fluorescent lamp, a halogen lamp or the like having a wavelength of 380 nm or less.

In the above embodiment, the honeycomb structure 18
Although the circumferential width of is set slightly larger than the diameter of the ultraviolet lamp 21, the honeycomb structure 18.
May be set to be equal to or smaller than the diameter of the ultraviolet lamp 21, whereby the ultraviolet rays emitted from the ultraviolet lamp 21 can be more reliably formed in the honeycomb structure 18.
Irradiates the inner part of the lattice, and hits the photocatalysts 17 supported on the surface of the lattice, whereby the harmful substances can be more efficiently decomposed.

When water to be treated, such as water containing harmful substances such as trihalomethane, tetrachloroethylene, and trichloroethylene, is supplied from the inlet 8, the water to be treated flows into the front chamber 12 from the inlet. Later, lower partition 1
0, passes through the lattice of the honeycomb structures 17... Disposed in the irradiation chamber 14, and then passes through the lattice of the honeycomb structures 18. , Flows into the rear chamber 13 and is drained from the outlet 7.

As a result, when the water to be treated passes through the lattices of the honeycomb structures 18, the harmful substances contained in the water to be treated are removed by the photocatalysts 17 carried on the surfaces of the honeycomb structures. The harmful substances adsorbed on the photocatalysts 17 are decomposed by a photochemical reaction caused by ultraviolet rays emitted from the ultraviolet lamp 21.

The ultraviolet rays radiated from the ultraviolet lamp 21 are partially absorbed by the photocatalysts 17 supported on the surface of the grid while passing through the grid of the honeycomb structure 18. The part passes through the lattice and the upper case 2 and the lower case 3
And is reflected on the inner surface of the honeycomb structure 18 again.
Irradiation in the grid of

Thus, the ultraviolet rays radiated from the ultraviolet lamp 21 can be more efficiently radiated to the photocatalysts 17, so that the efficiency of decomposing harmful substances by the photocatalysts can be improved.

FIGS. 5 to 7 show another embodiment of the present invention. In the front chamber 12, the rear chamber 13, and the irradiation chamber 14, the case 1 is divided into a plurality in the axial direction. Are provided, and communication holes 24 are formed in the partition walls 23a and 23d to communicate the adjacent rear room 13 or front room 12 with each other.

As a result, the water to be treated flows from the inflow port 8 into the front chamber 12 defined by the partition wall 23c, and then passes through the lattice of the honeycomb structures 18 and the partition wall 22a.
Flows into the irradiation chamber 14 defined by the partitioning wall 23a, and then passes through the lattice of the honeycomb structures 18 to flow into the rear chamber 13 defined by the partition wall 23a. .. Flows into the adjacent rear chamber 13 and then flows through each chamber sequentially while being bent in the axial direction in the case 1 as shown by an arrow in FIG. Is done.

The water to be treated is the honeycomb structure 1
When passing through the lattice of 8, the harmful substances contained in the water to be treated are removed by the photocatalyst 17 carried on the surface of the honeycomb structure, and the harmful substances adsorbed by the photocatalyst 17 Is decomposed by a photochemical reaction caused by ultraviolet rays emitted from the ultraviolet lamp 21.

FIG. 8 shows the partition walls 22a, 22b, 2
It shows the experimental results of the case where 3a to 23d are inserted and the case where 3a to 23d are not inserted, and the removal rate of chloroform is improved despite the constant area of the photocatalyst 17.

[0027]

According to the constitution of the present invention, the irradiation chamber for accommodating the lamp in the case, the front chamber communicating with the inlet for supplying the water to be treated into the case, and the flow chamber for draining the water to be treated from the case. Divided into a rear chamber that communicates with the outlet, and by arranging a photocatalyst in the communication part between the front chamber and the irradiation chamber and the communication part between the irradiation chamber and the rear chamber, the water to be treated passes through the case. The organic substance contained in the water to be treated is decomposed and removed twice by using a photocatalyst in between, and the treatment efficiency by the photocatalyst can be improved.

According to the structure of the present invention, the photocatalysts are arranged on the concentric circles of the lamps, so that a single lamp can irradiate a large number of photocatalysts with ultraviolet light almost uniformly and efficiently. Can be measured.

In addition, according to the structure of the present invention, the inlet and the outlet are arranged on a substantially diagonal line of the case avoiding the position facing the photocatalyst. It can improve the decomposition / removal rate of organic substances contained in water.

Further, according to the structure of the present invention, the case is formed of a material having high light reflection efficiency, the photocatalyst is arranged along the inner surface of the case, and the lamp is arranged at substantially the center of the case. This makes it possible to more efficiently irradiate the ultraviolet light to the photocatalyst, thereby improving the processing efficiency of the photocatalyst.

Further, according to the structure of the present invention, the photocatalyst is constituted by a plurality of divided structures, and the width of these structures is set to be equal to or less than the diameter of the lamp, so that the structure is close to the lamp of the structure. It is possible to irradiate the ultraviolet rays radiated from the lamp almost uniformly to the part located far from the part to be treated, thereby improving the processing efficiency of the photocatalyst.

Further, according to the structure of the present invention, the front chamber, the irradiation chamber, and the rear chamber are divided into a plurality of parts in the axial direction of the case by a partition wall, and a communication hole for communicating the chambers adjacent to an appropriate position of the partition wall is formed. By doing so, the frequency of contact between the fluid to be treated and the photocatalyst is greatly increased, and the decomposition / removal rate of organic substances contained in the water to be treated can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional perspective view showing an embodiment according to the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a sectional view taken along line BB in FIG. 2;

FIG. 4 is an exploded perspective view showing an embodiment according to the present invention.

FIG. 5 is an exploded perspective view showing another embodiment of the present invention.

FIG. 6 is a side longitudinal sectional view showing another embodiment.

FIG. 7 is a sectional view taken along the line CC in FIG. 6;

FIG. 8 is a characteristic diagram showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 7 Outlet 8 Inlet 12 Front room 13 Rear room 14 Irradiation room 17 Photocatalyst 21 Ultraviolet lamp 22 Partition wall 23 Partition wall 24 Communication hole

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuya Osugi 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Inside Sanyo Electric Co., Ltd. (72) Inventor Fumio Nakagawa 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Sanyo Tottori F term in Denki Co., Ltd. (reference) 4D037 AA02 AA09 AB02 AB14 BA18 BB01 CA12 4D050 AA04 AA10 AB19 BB01 BC06 BC09 BD02 4G069 AA03 AA08 BA48A BC16A BC16B CA01 CA10 CA11 CA15 DA06 EA25 ED07 EE07 FC06

Claims (6)

[Claims] An inflow port and an outflow port for water to be treated are provided at appropriate places in a hollow cylindrical case, and a photocatalyst for purifying the water to be treated is provided in the case, and a lamp for irradiating the photocatalyst with ultraviolet rays. In the case where is provided, inside the above case,
A front chamber communicating with the inflow port, an irradiation chamber accommodating the lamp, and a rear chamber communicating with the outflow port; and a communicating portion between the front chamber and the irradiation chamber and the irradiation chamber and the rear chamber. A water purification apparatus, wherein the above-mentioned photocatalyst is disposed in the water purification apparatus. 2. The water purification device according to claim 1, wherein the photocatalyst is arranged concentrically with the lamp. 3. The water purifier according to claim 1, wherein the inlet and the outlet are arranged on a substantially diagonal line avoiding a position of the case facing the photocatalyst. 4. The case is formed in a substantially cylindrical shape with a material having a high light reflection efficiency such as stainless steel or aluminum, the photocatalyst is arranged along an inner surface of the case, and the lamp is disposed substantially at the center of the case. The water purification device according to any one of claims 1 to 3, wherein the water purification device is disposed in a water purifier. 5. The photocatalyst according to claim 1, wherein the photocatalyst is constituted by a plurality of divided structures, and a width of the structure is set to be equal to or less than a diameter of the lamp. The described water purification device. 6. The front chamber, the irradiation chamber, and the rear chamber are each divided into a plurality of sections by a partition wall in the axial direction of the case, and water to be treated flowing into the front chamber from the inflow port is bent in the case. 2. A communication hole for communicating chambers adjacent to a proper position of said partition wall so as to pass through said chambers and drain from said outlet.
The water purification device according to any one of claims 1 to 5.