JPH10174827A - Filter rotational range hood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a maintenance free range hood by efficiently sucking soot and decomposing oil by a photocatalytic action. SOLUTION: The range hood is formed by providing a rotary shaft 3 at the edge part of the center side of a hood case partitioning an inlet opening part 2 having mealy half of the surface area of one surface of the hood case and fixing the center part of disklike filter 4 to the rotary shaft 3. The disklike filter 4 is made of a glass fiber carried a photocatalyst or a metal coated with the photocatalyst and is rotated while allowing the peripheral edge part in contact with the edge part of the hood case peripheral side partitioning the inlet opening part. An ultraviolet ray source 6 for irradiating the disklike filter 4 with ultraviolet ray is arranged inside of the hood case 1, where the inlet opening part 2 is not formed. At the time of cooking, the oil drop floating in the soot is filtered by the filter 4 and simultaneously the sticking oil is oxidation-decomposed by the photocatalyst activated by the ultraviolet irradiation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a range hood having a self-cleaning action utilizing an oil decomposition function of a photocatalyst.

[0002]

2. Description of the Related Art In a kitchen or the like, a range hood for exhausting smoke generated during cooking or the like to the outside is provided in order to maintain a comfortable living space. However, the conventional range hood has a drawback that oil tends to adhere thereto and impairs aesthetic appearance. Therefore, a disposable nonwoven fabric filter is attached to the filter unit, and the filter is replaced according to the contamination status. It is also known that a fluororesin coating is applied to the inner surface of a range hood in order to easily wipe off oil stains. More recently, a range hood having a self-cleaning function has been proposed. As a range hood of this type, Japanese Patent Application Laid-Open No. 5-15730 discloses a range hood in which a mixed catalyst of a catalyst exhibiting an oxidative decomposition effect by ultraviolet light and a catalyst exhibiting an oxidative decomposition effect by heat is applied to the inside of the hood or the intake side.
No. 5, JP-A-4-306440, and the like. JP-A-7-229640 discloses a method in which a photocatalyst is coated on a metal filter, and oil is decomposed by the action of a photocatalyst which is excited by irradiation from a near-ultraviolet lamp mounted inside a front panel. . The present inventors also use a filter in which TiO ₂ is supported on a glass fiber non-woven fabric with the aim of improving oil collection efficiency and promoting oil decomposition by a photocatalyst, as a maintenance-free range hood that does not require cleaning. This was proposed in Japanese Patent Application Nos. 7-176858, 8-19379, 8-163794, and the like.

[0003]

In a system in which a disposable nonwoven fabric filter attached to a filter portion is replaced in accordance with the state of contamination, it takes time and effort to replace the filter, resulting in an increase in cost. With a range hood in which the inside of the hood case is coated with a fluororesin, the troublesome work of wiping off attached oil has not been eliminated. The inside of the range hood has projections such as bent portions, rivets, screws, and the like that hinder the cleaning operation, and the fan itself is attached, so that the cleaning operation itself is difficult. In addition, since the range hood is installed at a high place, it may be dangerous work. Of the range hoods that have a self-cleaning action, if the filter is coated with a heating catalyst,
It is necessary to heat to a high temperature of 0 ° C. or higher. Therefore, there is a problem in safety such as a fire or a burn. In addition, since the hood case, the fan, and the switches are required to have heat resistance, it is required to manufacture a range hood with an expensive material, which increases the product cost.

On the other hand, metal filters coated with photocatalysts
Decompose and remove oil stains by UV irradiation
Is to place an ultraviolet light source upstream of the filter.
Oil easily adheres to the UV light source,
Easy to fall. Oil deposits that reduce UV intensity are purple
External light source TiO_Two Or coated with TiO _Two 
Use a coated UV-transmitting plate as a lamp cover
Can be suppressed by using
Special equipment is required for the minute. Also a food case
Has an ultraviolet light source in front of the
Line is inevitable, even purple with a wavelength of 300nm or more
Even though the outside line has little adverse effect on the human body,
I can't say it has no effect. The present invention
It was designed to solve the
UV light source placed in a place where oil inside the
By irradiating the rotating filter with ultraviolet light, the photocatalyst
The oil is effectively decomposed by the action, while the oil adheres to the UV light
Source is not contaminated and has good
Aim to provide a range hood that maintains oil resolution
And

[0005]

The range hood of the present invention
Is installed on one side of the hood case to achieve its purpose.
Entry opening and hood that defines the entry opening
A rotating shaft provided in the case and rotatable about the rotating shaft
A hood case that is fixed and has a peripheral edge defining the entrance opening.
The disk-shaped fin carrying the catalyst is in contact with the peripheral edge of the base.
A filter and the one surface on which the entrance opening is not formed.
Excitation means for exciting and activating the catalyst,
It is characterized by having. As a catalyst carrying filter
Is made of glass fiber carrying a photocatalyst or coated with a photocatalyst.
Metal-coated disk filters are preferred, but Si
O_Two , B_Two O_Three , Na _Two O, Al_Two O_Three Metal oxides such as
And other heating catalysts can also be used. Uses photocatalyst
In this case, the first side where the entrance opening is not formed is
An ultraviolet light source is provided as a starting means, and the disk-shaped filter is
Irradiate the line. When using a heated catalyst,
Provide an external heat source and irradiate far infrared rays. At the time of cooking,
Turn on the filter and turn on the ultraviolet light source.
This allows oil smoke to pass through the disc-shaped filter through the entrance opening.
At the same time, the oil adhering to the filter is
Decomposed by activated photocatalyst. Back of UV light source
When a reflection plate is provided on the substrate, the irradiation efficiency of ultraviolet rays is improved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A range hood according to the present invention has, as shown in FIG.
Is provided. The opening 2 is formed in a semicircular shape (see FIG. 2) with a size almost half of one surface of the hood case 1, and the rotating shaft 3 is attached to an edge of the hood case 1 at the center side which divides the opening 2. Have been. A baffle plate (not shown) can be attached to the opening 2 as needed. When the baffle plate is arranged, the suction wind speed in the filter direction increases, and the amount of oil smoke escaping to the outside of the range hood 1 decreases.

The center of a disk-shaped filter 4 is fixed to the rotating shaft 3. As the disc-shaped filter 4, a glass fiber filter supporting a photocatalyst or a metal filter coated with a photocatalyst is used. The photocatalyst is excited by ultraviolet radiation, there are a variety of metal oxides including the TiO ₂ exhibiting oxidative degradation properties of oil. TiO
_{When 2} is used as a photocatalyst, anatase type TiO
₂ is preferred. The glass fiber filter is made by binding glass fibers with a silica-based inorganic binder, and uses this as a base material to support a photocatalyst such as TiO ₂ . In the case of a metal filter, a filter obtained by coating a photocatalyst by spray coating on a punched or louvered aluminum or steel plate is used. The periphery of the disc-shaped filter 4
It slides on a shoe 5 provided on the hood case 1.

An ultraviolet light source 6 is provided inside one surface of the hood case 1 having no opening 2. When the ultraviolet light source 6 is arranged at this position, ultraviolet light does not leak to the outside of the hood case, and oil smoke does not adhere to the ultraviolet light source 6. The ultraviolet light source 6 has a wavelength of 400 n.
Any lamp that emits ultraviolet light of m or less can be used, and a health lamp, a chemical lamp, a black light, a germicidal lamp, a high-pressure mercury lamp, or the like can be used. FIGS. 1 and 2 show an example in which three straight tubular lamps are arranged. However, the present invention is not limited to this, and the number of lamps is determined according to the size and type of the disc-shaped filter 4. It can be changed as appropriate. Further, a ring-shaped lamp can be used for the ultraviolet light source 6. In the example of FIG. 1, the ultraviolet light source 6 is provided between the side plate of the hood case 1 and the disc-shaped filter 4, but on the opposite side (the upper part of the disc-shaped filter 4 in FIG. 1) or the disc-shaped filter 4. It is also possible to provide on both sides of.

It is preferable to dispose a reflection plate 7 on the back of the ultraviolet light source 6. As the reflection plate 7, a galvanized steel plate, an aluminum-plated steel plate or the like having a high surface gloss is used to improve the efficiency of irradiating the disk-shaped filter 4 with ultraviolet rays.
During cooking or the like, the fan 8 is driven to
And the ultraviolet light source 6 is turned on. The oil smoke generated by the cooker and the like is removed by the fan 8 into the food case 1.
The floating oil is removed when passing through the disc-shaped filter 4 while being sucked into the inside. The oil-removed gas is discharged to the outside air through the duct 9.

[0010] The disk-shaped filter 4 to which the oil has adhered rotates to reach the region where the ultraviolet light source 6 irradiates the ultraviolet light. Then, the adhering oil is oxidatively decomposed by the action of the photocatalyst activated by the ultraviolet irradiation. At this time, since the disc-shaped filter 4 is in a high temperature state immediately after the heat is transferred from the oil smoke, the oil decomposition action of the photocatalyst is promoted. In addition, in order to oxidatively decompose the adhering oil and maintain the disc-shaped filter 4 in a clean state, the rotation of the disc-shaped filter 4 and the turning on of the ultraviolet light source 6 may be continued for a predetermined time even after the fan 8 is stopped after cooking. preferable. When the oil smoke is passed through the disc-shaped filter 4 while decomposing the adhering oil in this manner, the range hood can be operated while maintaining the oil collecting efficiency and the oil decomposition efficiency at a high level.

[0011]

The glass fiber nonwoven fabric [Example] Density 50 g / m ² in a loading amount 70 g / m ² and those obtained by supporting the TiO ₂ hardened with inorganic binder, and a disk-shaped filter 4 of radius 300 mm. A disc-shaped filter 4 was rotatably assembled so as to cover the opening 2 of the range hood, and three 20 W black lights as ultraviolet light sources 6 were attached to one side of the hood case 1 having no opening 2. Further, a reflection plate 7 made of an Al-plated steel plate was attached to the back of the ultraviolet light source 6. During cooking, the fan 8 was driven to suck oil smoke into the food case 1 and the disk-shaped filter 4 was rotated at 3 rpm to turn on the ultraviolet light source 6. After cooking, the fan 8 was stopped, but the rotation of the disc-shaped filter 4 and the turning on of the ultraviolet light source 6 were continued for one hour. Under these conditions, the range hood was continuously used for three months, and the change over time in the amount of oil adhering to the disc-shaped filter 4 was measured. As a result, even after three months, the weight increase of the filter 4 was saturated at a constant amount. , Filter 4
It can be seen that the oil adhering to is decomposed by the photocatalysis.

[0012]

As described above, in the range hood of the present invention, the disc-shaped filter is rotatably arranged so as to face the opening to collect oil smoke generated at the time of cooking and the like. The oil attached to the filter is oxidatively decomposed by photocatalysis. Therefore, the range hood can be used in a state where the filter is always kept clean and the oil collecting efficiency and the adhering oil decomposition efficiency are stabilized at a high level. Also,
Since the ultraviolet light source is arranged so as not to reach the opening, the floating oil droplets do not directly fly and adhere to the ultraviolet light source, and a decrease in ultraviolet intensity is also prevented. Further, since ultraviolet rays do not leak to the outside, the range hood is excellent in safety for the user.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a range hood in which a disk-shaped filter is rotatably arranged.

FIG. 2 is a top view of a disk-shaped filter portion of the range hood.

[Explanation of symbols]

1: Hood case 2: Opening 3: Rotation axis
4: Disc-shaped filter 5: Shoe 6: Ultraviolet light source 7: Reflector 8:
Fan 9: Duct

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naruhito Suzuki 7-1 Takayashinmachi, Ichikawa-shi, Chiba Nisshin Steel R & D Co., Ltd. (72) Inventor Hiromitsu Fukumoto 7-1 Takayashinmachi, Ichikawa-shi, Chiba Japan (72) Inventor Koichiro Sakurai 32, Wadai, Tsukuba, Ibaraki Sekisui Chemical Co., Ltd.

Claims (3)

[Claims] An entrance opening provided on one surface of a food case, a rotation shaft provided in a food case defining the entrance opening, and a peripheral edge fixed to the rotation shaft so as to be rotatable. Abuts on an edge of the food case peripheral side that partitions the entrance opening, a disc-shaped filter carrying a catalyst, and is provided on the one surface where the entrance opening is not formed to excite the catalyst. A filter rotary type range hood, comprising: an exciting means for activating the filter. 2. An inlet opening provided on one surface of the food case and having substantially half the area of the one surface, and a rotating shaft provided on an edge of the food case at the center side which defines the inlet opening. A center part is rotatably fixed to the rotating shaft, and a peripheral part is in contact with an edge part on a peripheral side of a hood case that defines the entrance opening, made of glass fiber carrying a photocatalyst or made of metal coated with a photocatalyst A disk-shaped filter, and an ultraviolet light source provided on the one surface where the entrance-side opening is not formed, and irradiating the disk-shaped filter with ultraviolet light, and applying oil smoke from the entrance-side opening to the disk-shaped filter. A filter rotating range hood that activates a photocatalyst with ultraviolet rays from the ultraviolet light source and decomposes oil while passing through. 3. A filter rotary range hood, wherein a reflection plate is provided on a back surface of the excitation means according to claim 1 or the ultraviolet light source according to claim 2.