JPS63267876A - Deodorizing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a deodorizing device, and particularly to a deodorizing device suitable for improving the deodorizing effect.

[Conventional technology]

Some conventional deodorizing devices obtain a deodorizing effect by passing dust and odor particles between electrodes so that the dust and odor particles adhere to the electrodes due to the electrostatic force between the electrodes.

Incidentally, as related to this type of deodorizing device, for example, Japanese Patent Publication No. 17379/1983 can be mentioned. [Problem to be solved by the invention] The above-mentioned conventional technology is one in which odor-bearing fine particles are attached to an electrode by static electricity. However, no consideration was given to the removal of malodorous components in the air circulation path.

An object of the present invention is to provide a deodorizing device that can remove bad odors in an air circulation path.

[Means for solving problems]

The above object consists of an air circulation path configured by a case and a fan installed in the air circulation path, the fan is covered with a photocatalyst such as titanium oxide, and
This is achieved by disposing a germicidal lamp that excites the photocatalyst in the air circulation path.

[Effect]

A photocatalyst is excited by germicidal radiation (250 nm) generated from a germicidal lamp, and malodorous components in the air that come into contact with the photocatalyst covered by a fan are deodorized by oxidation decomposition. This will be explained with reference to FIGS. 1 and 2. Figure 1 is a front view showing a partial cross-section of the fan case;
FIG. 2 is a perspective view of the fan. In the figure, 1 is a fan case, and a part of the case 1 is provided with an air suction port 2 and an air discharge port 3. 4 is a once-through fan. 5 is a motor that drives the cross-flow fan 4. 6 is a base that supports the motor 5 and the cross-flow fan 4. 6a is a motor support stand provided integrally with the base. 6b is a bearing support plate provided integrally with the base 6. 7 is a bearing support cylinder, which is hollow inside. One end of the bearing support cylinder 7 is fixed to a bearing support plate 6b provided on the base 6. 8 is a bearing such as a ball bearing, and the bearing 8 is fixed to the bearing support cylinder 7. The movable portion of the bearing 8 is fixed to the end of the cross-flow fan 4 and supports the rotating cross-flow fan.

9 is a germicidal lamp, and 10a and 10b are sockets for lighting the germicidal lamp 9. The sockets 10a and 10b are fixed to a germicidal lamp support frame 11, and the support frame is fixed to the inside of a bearing support tube 7 which is fixed to a bearing support plate provided integrally with the base 6. Therefore, the sterilizing lamp 9 is fixed so as to be suspended in the central space inside the cross-flow fan 4. 12 is a large number of blades constituting the cross-flow fan 4, and a photocatalyst layer is provided on the surface thereof. The power line (not shown) for lighting the germicidal lamp is placed along the support frame 11 of the germicidal lamp, placed inside the bearing support tube 7, and pulled out from the hole provided in the bearing support tube 7. do. When the motor 5 that drives the cross-flow fan 4 is operated, the cross-flow fan 4 fixed to the shaft of the motor 5 rotates, and due to the action of the fan, surrounding air is sucked in through the air intake port 2 and collides with a large number of blades 9 at the air discharge port 3. More blown out. When the germicidal lamp 9 is turned on in accordance with the rotation of the once-through fan 4, the ultraviolet rays emitted from the germicidal lamp 9 are applied to the photocatalyst on the surface layer of a large number of blades 9. Therefore, the photocatalyst is excited by ultraviolet rays, and OH radicals are developed on the surface of the photocatalyst, which oxidizes and decomposes malodorous components, thereby producing a deodorizing effect. In addition, the germicidal radiation (250 nm) emitted from the germicidal lamp has the effect of killing bacteria in the air.

The action of this photocatalyst will be explained in detail with reference to FIG. Third
The figure is a diagram explaining the action of a photocatalyst.

N is an n-type semiconductor, such as fine particle titanium oxide. The interior of a semiconductor consists of a valence band full of electrons, a low charge band D involved in electron conduction, and a band gap B between them. When this semiconductor surface is irradiated with ultraviolet rays U emitted from the germicidal lamp 9, electrons e in the valence band K gain energy from the ultraviolet rays and jump to the lower valence band, creating holes from which the electrons e jump. This state is the excited state of the photocatalyst. OH radicals are generated from the semiconductor surface in this excited state.

Hole (h4) Soil surface hydroxyl group (OH-)→OH radical This OH radical has a very strong oxidizing power. Methyl mercaptan (CH3SH), which is known as a malodorous component, is OH
When it comes into contact with radicals, it is oxidized and decomposed as shown in the following formula, and the bad odor disappears.

CI (3S H+○H radical → CH3S + H20
In this way, malodorous components can be decomposed by the strong oxidizing power of OH radicals. By changing the material of the photocatalyst to titanium oxide, vanadium pentoxide, zinc oxide, etc., it is possible to expand the target gas to be decomposed, and it is also possible to coat a large number of blades constituting the once-through fan 4 with different photocatalyst materials. By doing so, the range of deodorizing gas can be expanded. In addition, the germicidal rays (250 nm) contained in the ultraviolet light emitted by germicidal lamps have the effect of deodorizing and sterilizing at the same time. When a deodorizing fan that combines a fan with a photocatalyst and a germicidal lamp is used to circulate cold air in a refrigerator as in this embodiment, a deodorizing effect and a sterilizing effect in the refrigerator can be obtained at the same time. In addition, when used for indoor air circulation in a room air conditioner, it is possible to obtain indoor deodorizing and antibacterial effects at the same time.

4 to 6 show other embodiments of the invention.

FIGS. 4 and 5 are diagrams showing an example in which a sirocco fan, a photocatalyst, and a spherical germicidal lamp are combined. In the figure, 13 is a fan case, 14 is an air intake port, 15 is an air discharge port, and 16 is a fan case.
17 is a fan casing, 17 is a sirocco fan, and 18 is a motor that drives the sirocco fan 17.

Arms 19a, 19b, and 19c each support a socket 21 to which a spherical germicidal lamp 20 is attached, and one end of each arm is fixed to the fan casing 16.

A socket 21 is disposed at each other end so as to be located in the central space inside the sirocco fan 17.

22 is a large number of blades constituting the sirocco fan, and a photocatalyst layer is provided on the surface thereof. When the sirocco fan 17 is operated and the spherical germicidal lamp 20 is turned on, the surrounding air is sucked into the interior of the sirocco fan 17 through the air suction port 14, collides with the many blades 22 that make up the sirocco fan 17, and enters between the blades. The air is forced out through the air discharge port 15 and discharged. At this time, the purple appearance emitted from the spherical germicidal lamp 20,]
The photocatalyst is excited by the action, and the same action as in the above-mentioned cross-flow fan has a deodorizing effect and a sterilizing effect at the same time.6 Next, an example of a propeller fan will be explained with reference to FIG. 2
3 is a propeller fan, and 24 is a motor that drives the propeller fan 23. 25 is a spherical germicidal lamp, and 26 is an arm for holding the spherical germicidal lamp 25 in the center space in front of the propeller fan 23. 27 is a fan guard. The surface of the propeller fan 23 is configured to be covered with a photocatalyst. When the germicidal lamp 25 is turned on in conjunction with the operation of the propeller fan, the air flows in the direction of the arrow in FIG. 6, and the same deodorizing effect and sterilizing effect can be obtained at the same time.

According to this embodiment, in a refrigerator-freezer, especially in a cold air forced circulation type refrigerator, the odor of fish and meat stored in the refrigerator compartment may also be circulated to the ice-making compartment in the freezer compartment, causing a bad odor to be transferred to the ice. Furthermore, even refrigerators are home to bacteria and mold that are resistant to low temperatures. By preventing bacteria and mold, high freshness can be maintained. In a room air conditioner, air is circulated in a closed space, so odors from furniture, clothes, mold, and bacteria also circulate inside the room. When indoor air becomes condensed water in the indoor heat exchanger when the air conditioner is operating, indoor music, mold, and bacteria are also concentrated, making it appear as though the air conditioner is producing odors and mold. Therefore, indoor music and mold collected in the indoor unit of the air conditioner can be actively reduced by the deodorizing device installed in the indoor unit.

Next, another embodiment of the present invention will be described with reference to FIG. 7, which shows a longitudinal cross-sectional view of a refrigerator. In the figure, 28 is a refrigerator, 29
3 is a freezer compartment, 30 is a refrigerator compartment, 31 is a fan for blowing cold air, 3
2 is a cooler, 33 is a cold air passage, 34 is an ultraviolet lamp, 3
5 is a photocatalyst, and 36 is a door switch. Cold air generated by the cooler 32 circulates inside the refrigerator as shown by the arrow in FIG. The photocatalyst 35 is arranged on the entire surface of the refrigerator compartment box, and the ultraviolet lamp 34 is arranged in the celestial sphere part of the refrigerator compartment. door switch 36
When is pressed by the door, the ultraviolet lamp 34 becomes energized, and the emitted ultraviolet light irradiates the food and the photocatalyst 35. In this case, the photocatalyst 35 is a substance that converts light energy into chemical energy and is a semiconductor. When energy above the band gap is applied to the photocatalyst, the electrons in the valence band jump to the conduction band, creating a polarized state, and the excited electrons in the conduction band and the holes generated in the valence band This will induce a chemical reaction. For example, the hydroxyl group OH- on the surface of the photocatalyst becomes an OH radical due to holes, and has a greater oxidizing power than ozone or the like. Due to the oxidizing power of this OH radical, malodorous components are oxidized and decomposed over a wide area within the refrigerator inner box. In addition, the excited part of the photocatalyst changes as food is put in and taken out and moved, and in the end, almost the entire surface can be used effectively over a long period of time.

Moreover, regarding the odor adhering to the inner box, since the photocatalyst 35 is installed on the surface thereof, the photocatalyst 35 decomposes the odor components and can prevent odor from adhering to the inner box.

Furthermore, the ultraviolet rays used for photocatalytic excitation inherently have sterilizing power, and can inactivate and destroy the nucleic acids of bacteria in the air inside the refrigerator and on the surface of stored foods, thereby sterilizing them.

The cold air that has been deodorized and sterilized after passing through the refrigerator compartment 30 is sent to the cold air passage 3
3 and returns to the cooler 32.

According to this embodiment, it is possible to obtain a refrigerator that exhibits deodorizing and sterilizing effects over a long period of time using an ultraviolet lamp and a photocatalyst.

〔Effect of the invention〕

According to the present invention, since the air always hits the fan blades before being circulated, there is good contact between the photocatalyst and the circulating air, and the photocatalyst has a great deodorizing effect.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a partial cross section of a fan case equipped with the present invention, FIG. 2 is a perspective view of a deodorizing fan, FIG. 3 is a diagram explaining the action of a photocatalyst, and FIG. FIG. 5 is a perspective view of the deodorizing fan shown in FIGS. 4 and 5, and FIG. 6 is a longitudinal sectional view of the deodorizing fan showing another embodiment of the present invention. , FIG. 7 is a longitudinal sectional view of a refrigerator provided with another embodiment of the present invention. 2... Air suction port, 3... Air discharge port, 4... Cross-flow fan, 5... Motor, 6... Base, 7...
Bearing support tube, 8... Bearing, 9... Germicidal lamp, 10a,
IQb...Socket, 11...Bactericidal lamp support frame, 12
...Blade, 14...Air suction port, 15...Air discharge port, 16...Fan casing, 17...Sirocco fan, 18...Motor, 19a. 19b, 19c...Arm, 20...Bactericidal lamp, 22
...Blade, 23...Propeller fan, 24...Motor, 25...Bactericidal lamp, 26...Arm, 27...
・Fan guard, 28... Refrigerator, 29... Freezer compartment, 30... Refrigerator compartment, 31... Stirring fan, 32.
...Cooler, 33...Cold air passage, 34...Ultraviolet lamp, 35...Photocatalyst, 36...Door switch. T, 30 4th item 5 Figure ¥, 6 Figure 251. Satsuzono Xcho

Claims (1)

[Claims] 1. Sterilization consisting of an air circulation path configured by a case and a fan installed in the air circulation path, covering the fan with a photocatalyst such as titanium oxide, and exciting the photocatalyst in the air circulation path. A deodorizing device characterized by being equipped with a light.