JPH07313842A - Deodorizing device - Google Patents

Abstract

PURPOSE:To continuously remove malodor over a long period of time without increasing temp. so much around a deodorizing device by installing a deodorizing element equipped with a catalyst bed, a metallic wind path wall forming a wind path space, an air intake means for feeding malodor-contg. air and a control part for controlling the heating of a heating element. CONSTITUTION:Malodor-contg. air in a room sent by a fan 3 is normally adsorbed and deodorized by a catalyst bed 14, and discharged as deodorized air. Before the catalyst bed 14 adsorbs the odorous components to its adsorptive capacity limit, a fan 3 is stopped and a tubular heating element 5 is energized. The heating element 5 generates heat by the energization and the heat is transferred to a metallic radiating fin 12. Since the heat is rapidly diffused into the fin, the fin 12 is uniformly heated, and further an enamel layer 13 formed on the surface of the fin and a catalyst layer 14 formed on the enamel layer are also uniformly heated to active a catalyst in the catalyst layer 14 in a short time. The odorous components adsorbed by the activated catalyst are oxidized and decomposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing device used in air conditioners, refrigerators, cooking appliances, dryers and the like.

[0002]

2. Description of the Related Art In recent years, various deodorizing devices have been proposed due to the demand for comfortable living environment. The conventional deodorizing device employs an adsorption deodorizing method using activated carbon, a deodorizing method using a catalytic action at room temperature, a method using a pair of an ozone generator and an ozone decomposing catalyst, and the like.

[0003]

The conventional deodorizing device as described above has the following problems. In the adsorptive deodorization method using activated carbon, the adsorption capacity gradually decreases as the odorous substance is adsorbed, and replacement is required after saturated adsorption. In addition, the deodorization method using a catalyst having a catalytic action at room temperature does not completely oxidize and decompose odorous substances but adsorbs them as incompletely oxidized and easily adsorbed substances, so that replacement is necessary when adsorption saturation is reached. . The method using a pair of an ozone generator and an ozone decomposing catalyst has a problem that the ozone generator is easily affected by humidity in the air, and the amount of ozone generated decreases with an increase in humidity, and the deodorizing performance deteriorates.

[0004]

The deodorizing device of the present invention is a deodorizing element having a catalyst layer provided on the surface of a metal radiating fin incorporating a heating element via a holo layer, and the shape of the deodorizing element is approximately equal. Control for controlling the heating of the metal air passage wall provided to form the air passage space at a distance, the air supply means for supplying the air containing the odor to the air passage space, the air inlet containing the odor, the deodorized air outlet, and the heating element. Parts. Here, the distance between the metal air duct wall and the deodorizing element is preferably 10 mm or less. Further, it is preferable that the air duct space is configured in a non-linear manner corresponding to the shape of the deodorizing element. Further, it is preferable to provide a catalyst layer on the air passage space side of the metal air passage wall via a holo layer.

Further, it is preferable to provide at least one of the odor-containing air intake port and the deodorized air discharge port with an opening / closing valve which is opened / closed in conjunction with the air supply means and is opened when the air supply means is operated.
Further, the flow velocity of the odor-containing air flowing through the air duct space is 10
It is preferably 0 m / min or less.

[0006]

In the deodorizing apparatus of the present invention, the catalyst layer normally adsorbs odorous components in the room. Then, before adsorbing the odorous components up to the adsorption capacity limit, the heating element is energized to generate heat. As a result, the catalyst layer efficiently absorbs heat by heat transfer from the heating element through the metal radiation fins, and the catalyst layer is heated to the activation temperature of the catalyst in a short time, and the adsorbed odorous components are oxidatively decomposed. To do. At the same time, the deodorizing ability of the catalyst layer is restored.

Further, since the heating element also heats the air in the vicinity of the heating element, the air flow as convection increases near the heating element. Then, when this air flow comes into contact with the catalyst layer heated above the activation temperature by the heating of the heating element, the odorous components and harmful components in the air are oxidized and purified by the catalytic action.
At this time, if air is forcibly supplied to the heating element by a fan, etc., regardless of natural convection that occurs in the vicinity of the heating element, the odorous components and harmful components in the air can be more effectively removed.

[0008]

EXAMPLES Preferred examples of the present invention will be described below. FIG. 1 shows the configuration of a deodorizing device according to an embodiment of the present invention. The deodorizing apparatus main body 1 is provided with a fan 3 at the air intake 2, and a heating element 5 having a combination of radiation fins in each of the three air passage spaces 4 provided in communication with the air intake 2. The air passage space 4 has a heat shield valve 6 on the air intake side.
And a fan synchronizing valve 8 is provided at the air outlet 7. Reference numeral 9 denotes a metal air passage wall forming the air passage space 4, 10 denotes a flow of air containing odor, and 11 denotes a flow of deodorized air.

The heating element 5 is composed of a tubular heating element such as a sheathed heater. As shown in FIG. 2, the radiating fins provided around the heating element include a tubular portion 12a surrounding the tubular heating element 5 and a plate-like portion 12b extending from the outer periphery of the tubular portion 12a in opposite directions along the air passage 4. Thus, the outer periphery is sequentially covered with the holo layer 13 and the catalyst layer 14. The above heating element,
A deodorizing element is constituted by the heat radiation fin, the holo layer and the catalyst layer. Although not shown, the above-described device includes a control unit that controls energization of the heating element 12. The control unit intermittently energizes the heating element for a certain period of time to operate the heating element. Further, the control unit controls the energization of the heating element and also controls the heat shield valve 6 and the fan synchronization valve 8 to close and the fan 3 to stop when the heating element operates.

Next, the operation of this device will be described. In this deodorizing device, the odor-containing air in the room sent by the fan 3 is usually adsorbed and deodorized by the catalyst layer 14 and discharged as odorless deodorized air. Then, before the catalyst layer 14 has adsorbed the odorous component up to its adsorption capacity limit, the fan 3 is stopped and the tubular heating element 5 is energized. This energization causes the tubular heating element to generate heat, and the heat is transmitted to the metal radiating fins 12. Since the heat transferred to the metal radiating fins 12 is quickly diffused into the fins, the fins are uniformly heated, and further, the hollow layer 13 formed on the fin surface and the catalyst layer formed on the hollow layer 13 surface. 14 is also heated uniformly, and the catalyst layer 14
The inside catalyst is activated in a short time. The odorous component adsorbed in the catalyst layer 14 is rapidly oxidatively decomposed by the activated catalyst. When the odorous component adsorbed as described above is removed by oxidative decomposition, the catalyst layer 14 recovers its adsorption ability again, and after the heating by the heating means is stopped, the odorous component can be adsorbed again. Thus, the adsorption of odorous components by the catalyst layer 14 when not heated and the catalyst layer 1 when heated
By alternately repeating the heating regeneration of No. 4 and the oxidative decomposition of the odorous component, the malodor can be continuously removed for a long period of time without raising the temperature around the deodorizing device so much.

Further, in this embodiment, a fan synchronous valve 8 and a heat shield valve 6 are provided. This is because the fan synchronizing valve 8 is closed in synchronization with the fan 3 to prevent convection of the heated air when the heating element is heated. As a result, the temperature of the catalyst layer is rapidly raised and activated, and the heat radiation is reduced, so that the temperature distribution is improved. Further, it is also possible to prevent a combustible substance or the like from entering the heated heating element from outside the device. Similar to the fan synchronous valve 8, the heat shield valve 6 closes when the fan stops, and has the same effect as that of the fan synchronous valve for prompt activation of the catalyst layer, and the function of shielding the fan from the heat-generating body that becomes hot. As described above, it is desirable to equip the heat shield valve 6 and the fan synchronous valve 8. As described above, by using this deodorizing device, even if odors, cigarette smoke, and harmful gases such as CO drift in the atmosphere in which this device is placed, it is purified by heating or adsorption to create a comfortable environment. be able to.

Next, the components of the deodorizing element will be described. Aluminum, holo steel, aluminized steel, stainless steel, or the like can be used as the metal radiation fin. The shape thereof can also be used in various shapes such as a plate shape, a tubular shape, and a curved surface shape according to the purpose, and it is used in close contact with a tubular heating element. As the holo layer forming material, silicate glass,
Borosilicate glass, crystallized glass or the like can be used.
The holo layer prevents the catalyst layer from coming into contact with the metal substrate and prevents the metal substrate from corroding due to the local cell action, and also improves the adhesion of the catalyst layer. As the tubular heating element, a sheathed heater, a PTC ceramic, a SiC resistor or the like in which a metal resistor such as a nichrome wire is enclosed in a corrosion resistant metal tube together with an electric insulating material can be used.

The catalyst layer is mainly composed of a noble metal, an odor adsorbent and a binder. As the noble metal, Pt or P
It is preferable to use d, and more preferable to use both Pt and Pd. This is because the oxidative decomposition power of Pt and Pd is higher than that of Rh and Ir, and the higher activity is obtained by using both Pt and Pd. Note that Ru
When used, Ru is volatilized and becomes a harmful substance when used at high temperature. As the odor adsorbent, alumina, zeolite, magnesium silicate or the like can be used. Alumina is metastable alumina such as β-, γ-, δ-, θ-, η-, ρ-, and χ-alumina. By supporting a promoter such as rare earth oxide on the surface of alumina,
Further increase in activity can be expected. The content of alumina in the catalyst layer is preferably 20 to 60 wt%. If the content of alumina is less than 20 wt%, it becomes difficult to highly disperse the catalytic noble metal, and sufficient catalytic activity cannot be obtained.
On the other hand, when it exceeds 80%, the odor adsorption capacity of the catalyst decreases.
Various zeolites can be used as the zeolite.
Among them, copper ion-exchanged A-type zeolite has the best adsorption property for odorous substances.

As the binder, silica is the most excellent, and it is possible to form a coating that is not easily peeled off from the base material when the catalyst layer is formed on the surface of the base material without deteriorating the catalytic properties. The content of silica in the catalyst layer is 10 to 4
It is preferably 0 wt%. Silica content is 40
If it exceeds wt%, cracks are likely to occur in the catalyst layer,
Adhesion is likely to be reduced. On the other hand, if it is less than 10 wt%, a sufficient effect of improving adhesion of silica cannot be obtained. It is desirable to include cerium oxide in the catalyst layer. By including cerium oxide in the catalyst layer, the catalytic oxidative decomposition activity for hydrocarbon compounds can be improved. The cerium oxide content in the catalyst layer is preferably 2 to 15 wt%. When the content of cerium oxide exceeds 15 wt%, the oxidative decomposition property of the catalyst begins to deteriorate, and when it is less than 2 wt%, a sufficient addition effect of cerium oxide cannot be obtained. It is also desirable that the catalyst layer contains barium oxide. By including barium oxide in the catalyst layer, the oxidative decomposition characteristics of the catalyst can be improved. The content of barium oxide in the catalyst layer is preferably 0.5 to 5 wt%. When the content of barium oxide exceeds 5 wt%, the adhesion of the catalyst layer deteriorates, and when it is less than 0.5 wt%, a sufficient addition effect of barium oxide cannot be obtained.

The same effect can be obtained by using barium carbonate instead of barium oxide. The desirable addition amount of barium carbonate is 0.5 in terms of barium oxide amount.
~ 5 wt%. Further, when forming the catalyst layer, it is desirable to provide the catalyst layer after roughening the surface of the holo layer, or after sufficiently degreasing the surface of the holo layer. By this method, the adhesion between the holo layer and the catalyst layer can be improved. Various methods can be used to form the catalyst layer. For example, there are spray coating, dip coating, electrostatic coating, roll coating method, screen printing method and the like. It is desirable that the catalyst layer contains at least activated alumina, zeolite, and a platinum group metal. By using activated alumina, zeolite and platinum group metal at the same time, it is possible to obtain a synergistic effect of improving the adsorption characteristics for acidic odor components as compared with the case of using activated alumina or zeolite alone.

Example 1 Outer diameter 6.6 mm, length 450
mm, power consumption 300W, sheathed heater, diameter 30m
An aluminized steel pipe having a thickness of m, a thickness of 1 mm, and a length of 400 mm was pressure-bonded to form a metal radiating fin having a cross-sectional shape similar to that shown in FIG. Then, a borosilicate vitreous holo layer having a film thickness of 50 μm was formed on the fin surface, and then a catalyst layer having the following composition was uniformly formed on the holo layer surface. The catalyst layer composition was 0.1 wt% platinum, 20 wt% copper ion-exchanged A-type zeolite, 30 wt% silica, and the balance alumina amount, and the catalyst layer amount was 5 g. A deodorizing device as shown in FIG. 1 was constructed using the above deodorizing element. An enlarged view of the vicinity of the deodorizing element is shown in FIG. In this example, the air passage space 4 is formed so that the distance t between the catalyst layer on the surface of the deodorizing element and the metal air passage wall 9 is equal to 10 mm. Figure 3 (b)
Shows a comparative example in which the distance between two air passage walls sandwiching the deodorizing element is constant so that the distance between the bulging portion at the center of the deodorizing element and the metal air passage 19 is 10 mm.

With respect to the examples and comparative examples in which the structure of the air duct space was different as described above, odor-containing air was supplied and the deodorizing ability was tested. The test conditions were as follows: a 1 m ³ acrylic resin box was used, and the deodorizing devices having the configurations shown in FIGS. It was supplied at a linear velocity of 10 m / min and circulated in the box. Methyl mercaptan as an odor substance in the box has an initial concentration of 1
An amount of 0 ppm was added, and the methyl mercaptan residual rate in the box was measured 30 minutes after the start of the deodorizing test. The results are shown in Table 1. From Table 1, the configuration of (a) in which a uniform air duct space is formed has a methyl mercaptan residual rate of about half that in (b) which is not so, and the deodorizing performance is excellent. By forming a substantially uniform air duct space distance in this way, a device with excellent deodorizing efficiency can be obtained.

[0018]

[Table 1]

[Embodiment 2] Using the heating element with the catalyst layer of Embodiment 1, the deodorizing characteristics when the air passage space distance t shown in FIG. It was measured by a methyl mercaptan deodorization test. The results are shown in Table 2. Table 2
As is clear from the above, when the airway space distance exceeds 10 mm, the deodorizing performance deteriorates, and even when the odor-containing air flow velocity exceeds 100 m / min in linear velocity, the deodorizing performance also deteriorates. Therefore, a desirable range is an airway space distance of 10 mm or less, an odor-containing air linear velocity of 100 m / min, and more desirably,
Air path space distance 6 mm or less, odor-containing air linear velocity 83 m /
Minutes.

[0020]

[Table 2]

[Embodiment 3] A holo layer and a catalyst layer were formed on the surface of a heating element which was curved and closely adhered to metal radiation fins in the same sheath heater as in Embodiment 1. Using this deodorizing element, as shown in FIG. 4 (a), the air duct space was formed non-linearly with a width of 6 mm. Further, a heat generating element was prepared by closely contacting the same sheath heater so that the radiation fins 15 had a planar shape, and the holo layer 16 and the catalyst layer 17 similar to those in Example 1 were formed on the surface thereof. Using this deodorizing element, FIG.
As shown in (b), a deodorizing device having a linear structure in which the air passage space is 6 mm wide was prepared. With respect to these deodorizing apparatuses, the same deodorizing performance test using methyl mercaptan as in Example 1 was conducted. The results are shown in Table 3. The configuration of (a) in which the air duct space is formed in a non-linear manner is preferable because a better deodorizing performance can be obtained.

[0022]

[Table 3]

[Example 4] Using the deodorizing element of Example 1,
The deodorizing device having the structure of the air passage of FIG. 5 (a) of Example 1, and the same holo layer 18 and catalyst layer 19 as those formed on the heat radiating fins of the heating element on the heating element side of the metal air passage wall 9. The formed deodorizing device having the configuration of FIG. 5B was created. Also,
For comparison, a metal radiating fin was not used, and a holo layer 2 similar to that of Example 1 was formed on the same sheath heater surface as that of Example 1.
2. The deodorizing element having the catalyst layer 23 formed is prepared, and as shown in FIG.
FIG. 5 installed in the same air passage configuration as in (a) and (b).
A deodorizing device as a comparative example of (c) and (d) was prepared. With respect to these deodorizing devices, the same deodorizing performance test using methyl mercaptan as in Example 1 was conducted. Then, the sheathed heater was energized at a rated voltage for 30 minutes to generate heat, to oxidatively decompose the adsorbed methyl mercaptan and to regenerate the adsorption ability of the catalyst layer. After that, the above deodorizing test was performed again, and the deodorizing performance after regeneration was measured. The catalyst coating amount was all 5 g. The results are shown in Table 4. As is clear from Table 4, the embodiment (a) of the present invention in which the heating element has a metal radiation fin,
In (b), better deodorizing performance is obtained as compared with Comparative Examples (c) and (d) in which the catalyst layer is directly formed on the sheath heater without using fins.

[0024]

[Table 4]

In the above embodiments, only one deodorizing element is used, but the deodorizing device of the present invention may use a plurality of deodorizing elements. For example, the deodorizing element is used in the configuration shown in FIG. However, by using such a plurality of deodorizing elements, the deodorizing performance can be further improved.

[0026]

As described above, according to the present invention, odors in the atmosphere in which the deodorizing device is placed and harmful gases such as cigarette smoke are purified and removed by adsorption and catalytic action. In addition, a comfortable heating environment can be provided when the deodorizing element is used as a heating device.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional view showing a deodorizing apparatus according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the deodorizing element.

FIG. 3 is a diagram showing a configuration of a main part of a deodorizing device.

FIG. 4 is a diagram showing another configuration example of the main part of the deodorizing device.

FIG. 5 is a diagram showing another configuration example and a comparative example of the main part of the deodorizing device.

FIG. 6 is a diagram showing a configuration example of a main part of a deodorizing device.

[Explanation of symbols]

 1 Deodorizer main body 2 Air intake 3 Fan 4 Airway space 5 Tubular heating element 6 Heat shield valve 7 Air outlet 8 Fan synchronous valve 9 Metal airflow wall 10 Odor-containing air flow 11 Deodorized air flow 12 Radiating fin 13 Holo Layer 14 Catalyst layer

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location F24F 1/00 F24F 1/00 371 Z (72) Inventor Yasuhiro Fujii 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Within the corporation

Claims (5)

[Claims] 1. A deodorizing element in which a catalyst layer is provided on the surface of a metal radiating fin incorporating a heating element via a holo layer, and an air duct space is formed at substantially equal distances along the shape of the deodorizing element. A deodorizing device comprising a metal air passage wall, an air supply means for supplying air containing odor to an air passage space, an air inlet containing odor, a deodorizing air outlet, and a control unit for controlling heating of a heating element. 2. The distance between the metal air passage wall and the deodorizing element is 10 m.
The deodorizing device according to claim 1, which is not more than m. 3. The deodorizing device according to claim 1, wherein the air duct space is configured in a non-linear manner. 4. The deodorizing device according to claim 1, wherein a catalyst layer is provided on the air passage space side of the metal air passage wall via a holo layer. 5. The deodorizing device according to claim 1, wherein at least one of the odor-containing air intake port and the deodorizing air discharge port has an opening / closing valve interlocking with an air supply means.