JPH01210018A - Air cleaner - Google Patents

Abstract

PURPOSE:To retain deodorizing performance for a long time by providing an electric heater on the upstream side of a deodorizing filter constituted of active carbon, active carbon fibers and the like and also providing catalysts. CONSTITUTION:An electric heater such as a titanic acid barium group honeycomb electrical resistant material 1 is provided on the upstream side of a deodorizing filter such as a honeycomb-shaped active carbon structure 2 constituted of active carbon, active carbon fibers and the like, while an adsorbing substance adsorbed by a deodorizing filter is deodorized by intermittent heating of an electric heater in an air purifier having catalysts 3 such as Pt and the like and oxidized and decomposed by catalysts 3. Deodorizing performance can be retained for a long time by said process.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air cleaner that collects dust or deodorizes it by charging dust.

Conventional technology.

Conventional air cleaners are equipped with ionizing discharge electrodes, dust collecting electrodes, and deodorizing filters such as activated carbon to remove dust and deodorize.

Problems to be Solved by the Invention Conventional air cleaners use an activated carbon filter to provide a deodorizing function, and remove malodorous components by adsorbing them to the activated carbon. In order to improve the deodorization rate and durability by increasing the amount of adsorption, it is necessary to increase the weight of activated carbon, but the ventilation resistance increases.

The capacity of the ventilation motor must be increased.

Air purifiers are larger. Recently, activated carbon with a honeycomb structure has been put into practical use, but it has drawbacks such as high price, low weight of activated carbon, small amount that can be adsorbed, and poor durability.

Means for Solving the Problems In order to solve the above problems, the air cleaner of the present invention is equipped with a deodorizing filter made of activated carbon, activated carbon fiber, etc., an electric heater, and a catalyst, and the electric heater is provided upstream of the deodorizing filter. It is something that has been established.

Adsorbents such as active carbon have a fast adsorption rate at low temperatures such as room temperature, and begin to desorb when the temperature is raised. When used as an adsorbent, for example, when activated carbon is used, malodorous components are adsorbed onto the surface of the activated carbon and covered, resulting in a decrease in the amount of adsorption. By periodically or artificially energizing the heater, the adsorbent is heated and begins to desorb. At this time, the desorbed malodorous components have a high concentration, so they are catalytically cracked or converted by a catalyst provided on the downstream side, and converted into carbon dioxide, water vapor, and other components. After desorption, the adsorbent is restored to a state with high adsorption capacity as an adsorbent.

Example (Example 1) A barium titanate-based honeycomb electric resistor (PTO heater) 1 was combined with a sheet made of activated carbon fiber and polymer fiber and processed into a wave shape, and this was rolled. A honeycomb activated carbon structure 2 obtained by stacking or laminating a honeycomb structure 2 and a honeycomb structure made of copillite are wash-coated with porous alumina, etc., and are further coated with platinum, gold, palladium, rhodium, copper, manganese, and nickel. , chromium, cobalt, zirconia, titanium, iron, etc., and a catalyst body 3 supporting at least one kind of metal oxide was integrated into a unit. This is shown in FIG.

(Example 2) As shown in FIG. 2, a separate PTC
A honeycomb heater 4 was installed and unitized in the same manner.

(Example 3) As the electrical resistor 1, a spirally wound nickel chromium resistor was used. The rest was the same as in Example 2.

(Example 4) As the catalyst body 3, a cloth-shaped catalyst whose base material was thin fibers such as silica or alumina was used. Catalyst metal is platinum,
A material supported with noble metals such as palladium, rhodium, and gold was used. The rest was the same as in Example 2.

Note that the durability performance of the air cleaner of Example 4 and the conventional air cleaner was evaluated by placing the dust collecting electrode shown in FIG. 4 behind them. In the evaluation test, the device under test was placed in the same part of the conference room where it was frequently used and where participants smoked.
After about 100 hours, the same device under test was placed in a different room and 10 cigarettes were automatically smoked, then six panelists entered the room and evaluated it on a six-point scale according to the Ministry of Health and Welfare's Odor Pollution Study Group method. Comparing the average scores, it was confirmed that the air purifier of this example showed almost no decline in evaluation over the course of one hour compared to the conventional example, and that its deodorizing function was maintained for a significantly longer period of time.

Furthermore, as another example, various known heating bodies were used as the electric resistor 1. When using two types of heating elements 1.4, resistor 1 that heats the adsorbent such as activated carbon.
A different type of resistor 4 was used to heat the catalyst.

Adsorbents include granules processed into thin layered structures, honeycomb structures, foam structures, urethane foam, etc. with activated carbon or fibers attached, sheets, mats, etc.
Can be used in woven fabric.

The catalyst body 3 also has a granular shape, a honeycomb shape, a woven fabric shape, and a foam shape.

Those with structures such as thin layers can be used.

The air purifier of this embodiment includes a discharge electrode for ionizing dust, a dust collection electrode for collecting dust, a blower fan, and an electric circuit with a high voltage power supply that controls these and applies high voltage. used.

A well-known set of two parallel high voltage application electrodes can be used as the dust collection electrode, but a thin conductive electrode layer is made of metal foil, metal vapor deposition film, conductive coating film, etc. to maintain the distance between the electrodes. A collector made of thin parallel electrodes can be used. Examples are shown in FIGS. 3 and 4. In FIG. 3, 11 is an electrode layer and 12 is a thin insulating film. Also, in FIG.

21 and 22 are thin electrode layers, 23 is an insulating film between the two electrode layers, and 24 is a film having protrusions 26 which are partially processed to protrude.

Note that it is possible to incorporate one or more of the air cleaners as a part of air conditioning equipment.

Effect of the invention As described above, according to the present invention, the following effects are achieved.

(1) The adsorbent of the deodorizing filter is periodically and artificially heated intermittently, and the adsorbed substances begin to desorb, contact the catalyst provided downstream, and are oxidized or decomposed before being dispatched. . Normally, deodorizing filters can be designed by optimally selecting only the conditions that allow them to exhibit their adsorption function at room temperature, so they do not require an excessive weight of activated carbon, can be made smaller, and can use products with low pressure loss, allowing for smaller equipment. .

(→ Since it has an adsorbent regeneration processing function, the user of the purifier can activate the regeneration processing function before the deodorization function is deactivated, and can maintain the deodorization function for a significantly long period of time.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of an air cleaner showing one embodiment of the present invention, FIG. 2 is a cross-sectional view of a main part of an air cleaner showing another embodiment of the present invention, FIGS. 3 and 4 are sectional views of dust collection electrodes arranged at the rear of the air cleaner. 1...Honeycomb-shaped electrical resistor, 2...
Honeycomb-shaped activated carbon structure, 3...Catalyst body, 4.
...P T (j, -nicum heater.

Claims (2)

[Claims] (1) An air purifier comprising a deodorizing filter made of activated carbon, activated carbon fiber, etc., an electric heater, and a catalyst,
An air purifier characterized by having an electric heater provided upstream of a deodorizing filter. (2) The air cleaner according to claim 1, further comprising a second electric heater provided upstream of the catalyst and downstream of the deodorizing filter.