JPH05137940A - Dryer - Google Patents

Abstract

PURPOSE:To purify an odoriferous component present in a drier with a heating element, a drying chamber and a box housing them. CONSTITUTION:A heating element 3 in a dryer is coated with an adsorbent 4 or this adsorbent 4 is disposed near the heating element 3. By this structure, a malodorous component generated by heating a body to be dried is deodorized by adsorption on the adsorbent 4 cooled after the heating operation and no malodor remains in the body to be dried. The adsorbent 4 can be regenerated by discharging the adsorbed malodorous component from the system by heating with the heating element 3 before the adsorbent 4 attains to the limit of the adsorbing ability and a malodor in the drier can be removed with the adsorbent 4 over a long period of time. Deodorization can be carried out even during the operation of the heating element 3 by incorporating a noble metal catalyst into the adsorbent 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drier having a function of removing odorous components generated in a drier such as tableware, clothes, shoes, clothes and futons.

[0002]

2. Description of the Related Art A conventional dryer will be described below.
Generally, a drier is composed of a heating element, a drying chamber, and an ordinary metal housing box for accommodating the heating element and the drying chamber, and a fan is provided in the drier if necessary. The heating element used in this conventional dryer has a metal wire such as a nichrome wire or a kanthal wire formed into a coil, a metal tube or a tubular body such as a quartz tube or a ceramic tube, or the like. Cordierite, clay,
Examples include glass, a material coated with a far-infrared radiation material such as nickel oxide or iron oxide, or a ceramic heater in which an electric resistor is incorporated in a ceramic sintered body.
In conventional dryers, the heating element directly heats the object to be heated, the drying element is heated by the hot air generated by forcedly sending air from the fan to the heating element, and a reflector is placed behind the heating element. The object to be heated is heated by the heating element by heat conduction, convection, or radiation such as provision of radiant heating.

The dryer is filled with the odor of perspiration and various secretions such as the material to be dried, which causes discomfort. These malodorous components are mainly ammonia, fatty acids, unsaturated hydrocarbons, sulfur-containing organic compounds such as mercaptans, nitrogen-containing organic compounds, and the like, which are derived from the material to be dried in the dryer and detergent components.

In such a dryer, the heating element heats the material to be dried and also the odor remaining in the dryer. Generally, the higher the temperature of an odor substance,
It felt strongly on the human nose, and the odorous component once adsorbed in the dryer was heated to vaporize again and diffuse into the atmosphere inside the dryer.

[0005]

However, in the above-mentioned conventional structure, since the heating element does not have the ability to purify odorous components, the odor becomes stronger when the dryer is used than when the dryer is not used. There was a problem that occurs.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a dryer capable of completely removing odors in the dryer and capable of deodorizing for a long period of time.

[0007]

To achieve this object, the dryer of the present invention has a structure in which an adsorbent having a deodorizing function is disposed on or near the surface of a heating element, or the adsorbent contains a noble metal catalyst. It is configured to include.

[0008]

With this configuration, the heating and regeneration of the adsorbent when heated by the heating element and the catalytic decomposition of the odorous component and the adsorption of the odorous component by the adsorbent when not heated are alternately repeated, and the bad odor is generated over a long period of time. It will be removed continuously.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

As the dryer, there are dryers for tableware, clothes, shoes, clothes, futons, etc. Here, a clothes dryer will be described as an example.

In FIG. 4, 1 is an intake port, 2 is a heat exchange fan, 3 is a heating element, 5 is a drum, 6 is a dustproof filter,
7 is a heat exchange fan, and 8 is an exhaust port. White arrows indicate the direction of air flow.

As shown in FIGS. 1 and 2, the heating element 3 has a nichrome wire 9 built therein and a quartz tube 10 whose both ends are sealed by insulators 11 is covered with an adsorbing element 4 on the entire outer circumference thereof.
And / or, as shown in FIG. 3, there is a heating element 3b in which the lower half surface of the outer periphery of the quartz tube 10 is covered with the adsorbent 4.

The adsorbent 4 is composed of magnesium silicate alone, zeolite alone, a mixture of magnesium silicate and zeolite,
It is obtained by adding an inorganic binder to magnesium silicate or zeolite, or by adding an inorganic binder to a mixture of magnesium silicate and zeolite.

With respect to the dryer having the above-mentioned components,
The relationship and operation of each component will be described below.

When a switch (not shown) of the dryer is turned on, the heating element 3 in the refrigerator starts to be energized, the heat exchange fan 2 is activated, and the air sucked through the adsorption port 1 and the air circulating in the dryer are removed. Is heated or cooled to a predetermined temperature by the heat exchange fan 2 and sent to the heating element 3. The adsorbent 4 coated on the heating element 3 adsorbs an odor component when the air contains the odor component. The air that has become an odorless component is sent into the drum 5 to dry the material to be dried, passes through the filter 6, is discharged from the heat exchange fan 7 through the exhaust port 8 to the outside of the machine, or is circulated in the apparatus. .. In this way, the odorous components in the dryer are purified by absorbing the odors. Here, the clothes dryer is taken as an example, but by providing the adsorbent 4 on the heating element 3, the odorous components in the dryer such as tableware, clothes, shoes, and futon can be purified.

The magnesium silicate, the zeolite and the inorganic binder which are the constituent materials of the adsorbent 4 will be described below.

Magnesium silicate is a composition obtained by combining magnesium oxide such as orthomagnesium silicate, magnesium metasilicate, talc, magnesium tetrasilicate and magnesium trisilicate, silicon dioxide and water in various proportions.

Zeolites are crystals of hydrous aluminosilicate, which is also known as zeolite. This crystal has a three-dimensional network structure, and alkali metals such as Na and Ca and alkaline earth metals are present in this structure. These metal ions are characterized by having a function of substituting with other metal ions and having a function of selectively adsorbing other water and odorous components into the cavities. Zeolite exists as a natural stone, but can be artificially synthesized. In this embodiment, it is possible to use either the natural stone or the synthesized zeolite. Although natural stone has inferior adsorption capacity to synthetic ones, it can be used in large amounts because it is cheaper in cost.Because it is a stone, it can be molded without adding additives to any molded body or granules. There are advantages. On the other hand, although synthetic products are more expensive than natural stones, they can be used by selecting those that have excellent adsorption capacity and can be used in a small amount, so they have the advantage of being able to be coated by applying them to the base material. Have. A, X, Y and L forms of synthetic zeolite are known from the crystal structure thereof, and any of these can be used in this example. Among them, Cu ion-exchanged A-type zeolite in which copper ions are exchanged in A-type is particularly preferable because it has excellent adsorption performance.

When the surface of the substrate is coated with the synthetic zeolite, the content is preferably 20 to 80 wt%. 20 wt
When the amount of the inorganic binder is less than 100%, the amount of zeolite adsorbed is small and the original adsorption function cannot be exhibited. Further, when the content is more than 80 wt% and the inorganic binder is small,
The coating film has cracks, which makes it difficult to support the coating film on the substrate. Therefore, when zeolite is supported on the surface of the base material, the content is preferably 20 to 80 wt%.

The inorganic binder contains alumina and silica, but in this embodiment, it is desirable to contain silica. By including silica in the coating layer, the adhesion of the coating layer to the quartz tube or the glass substrate can be strengthened.
The content of silica in this example is 10 to 40 wt% in the coating layer.
% Is desirable. Silica content is 40wt%
When it is more than 40% by weight, the catalyst coating layer is apt to be cracked and the adhesiveness is apt to be lowered, and the content of zeolite having an adsorbing ability is lowered, and the like, so that it is preferably 40 wt% or less. On the other hand, if it is less than 10 wt%, a sufficient effect of improving the adhesion property of silica cannot be obtained. The silica in this example is silicon dioxide, but silicic acid may be used instead.

Zeolite can be installed as a molded body in a heating cooker like a conventional deodorant such as activated carbon. Even as it is, it acts as a deodorant that is superior to conventional activated carbon, and by using the composition and constitution described below, it can be used as a reproducible deodorant.

That is, the first constitution is to add a precious metal catalyst to zeolite or zeolite to which an inorganic binder is added. Noble metal catalyst is Pt,
Pd, Rh, Ru, Ir, etc. are used alone or as a salt thereof, or they are used in combination. By having such a structure and installing in the vicinity of the heat source, the deodorizer for the dryer made of zeolite can be purified by a precious metal catalyst and can be regenerated and can be semipermanently used.

Next, the second structure will be described. The deodorants known so far have been generally discarded when the adsorption reaches saturation like activated carbon. It is proposed that even such a conventional adsorbent can be regenerated without being thrown away. That is, by arranging the deodorant in the vicinity of the heating element 3, it is possible to semipermanently use the conventionally used deodorant.

Further, in order to improve the adsorption characteristics of the adsorbent 4, additives are added as described below.

That is, activated alumina is used for the adsorbent 4 together with a noble metal catalyst. Activated alumina includes β-, γ-,
Metastable alumina such as δ−, θ−, η−, ρ−, χ− alumina is used. It is desirable that the adsorbent 4 of this embodiment contains cerium oxide together with a noble metal catalyst.
The catalytic oxidative decomposition activity for a hydrocarbon compound containing barium oxide and titanium oxide can be improved.

As the heating element 3, an electric resistance element such as a nichrome wire, a kanthal wire or a tungsten wire is used, and a metal tube, a quartz tube or a ceramic tube (for example, cordierite tube,
A mullite tube, an alumina tube, a zirconia tube, a magnesia tube, a calcia tube, etc.) or a ceramic heater containing an electric resistor in a ceramic is used. Among them, quartz tubes have excellent heat resistance and corrosion resistance.

Further, since the adsorbent 4 has the same coefficient of thermal expansion, it has few cracks even after the coating film is formed and is excellent in adhesion. When the adsorbent 4 is formed on the surface of the heating element 3, after the surface of the quartz tube 10 is roughened by the heating element 3, for example, a quartz heater, the adsorbent 4 is provided or the surface of the quartz tube 10 is sufficiently degreased. After that, it is desirable to provide the adsorbent 4. By this manufacturing method, the adhesion between the heating element 3 and the adsorbent 4 can be improved. As a method for forming the adsorbent 4 on the surface of the heating element 3, spray coating, dip coating, electrostatic coating, roll coating, screen printing or the like can be used.

Specific examples of the present invention will be described below.

(Embodiment 1) A first embodiment of the present invention will be described below. 1000 g of copper ion-exchanged zeolite and 1000 g of colloidal silica with a silica content of 20 wt%
Water (1200 g) was added to the mixture and thoroughly mixed using a ball mill to prepare a slurry A. The slurry A was applied by spraying on 277 mm at the center of the surface of the quartz tube 10 having an outer diameter of 10 mm, an inner diameter of 9 mm, and a length of 330 mm, followed by drying at room temperature and subsequent firing at 500 ° C. for 1 hour. A quartz tube 10 having No. 4 was used, and a nichrome wire 9 and an insulator 11 were used as an electric resistor to produce a heating element A1.
The coating amount of the adsorbent 4 was 0.6 g.

As described above, according to this embodiment, the heating element A
By disposing the adsorbent 4 on the surface of No. 1, the malodorous component generated by heating the material to be dried by the heating element A1 of the dryer is adsorbed and deodorized by the adsorbent 4 cooled after the completion of the drying operation. No odor is left on the dried product. Further, the adsorbent 4 can be regenerated by heating it with the heating element A1 and discharging the adsorbed odorous components to the outside of the system before reaching the limit of its adsorption capacity, and the bad odor in the dryer can be maintained for a long period of time. Can be removed.

(Second Embodiment) The second embodiment of the present invention will be described below.

In the composition of the slurry A described in the first embodiment, instead of copper ion-exchanged zeolite, the same amount of other adsorbents (activated carbon, iron-ascorbic acid, molecular sieve 5A, magnesium silicate, mordenite, Mg). Ion-exchanged zeolite, Ca ion-exchanged zeolite, and alumina) were used to prepare slurries containing the respective adsorbents, and a quartz tube 10 having an adsorbent 4 on the surface was prepared in the same manner as in the first embodiment. The heating element 3 was produced using the nichrome wire 9 and the insulator 11 as a body.

The acetaldehyde adsorption characteristics of each of the above heating elements were examined as follows.

A 250 liter test box was prepared so as to have an acetaldehyde content of 20 ppm, and a fan was placed in the test box to completely vaporize the acetaldehyde and diffuse it uniformly. A heating element 3 having an adsorbent 4 containing each adsorbent is placed therein, and the initial value (20 ppm) is set to 1
The residual odor after 30 minutes and 60 minutes was determined as 00% and is shown in Table 1.

[0035]

[Table 1]

As is clear from (Table 1), the heating element having the adsorbent 4 containing zeolite and magnesium silicate has the lowest odor residual rate and good adsorption characteristics.

The odor residual rate of the adsorbent 2 formed by a slurry using magnesium orthosilicate, magnesium metasilicate, magnesium tetrasilicate and magnesium trisilicate as the magnesium silicate was 48 after 60 minutes.
%, 47% and 49% were obtained as good values.

In the present embodiment, zeolite and magnesium silicate were individually added to the slurry, but they may be mixed and used.

Although the adsorbent 4 is disposed on the surface of the heating element in the first and second embodiments, the adsorbent may be a molded body and may be disposed in the vicinity of the heating element 3 in the dryer.

(Embodiment 3) A third embodiment of the present invention will be described below.

Slurry A was prepared by substituting various inorganic binders for the same amount of the inorganic binder in the final solid component of the aqueous solution of silicic acid anhydride in slurry A in slurry A described in the first embodiment. Then
The heating element 3 was produced in the same manner as in the first example. In order to investigate the film hardness of these adsorbents 4, JISG-33
The results of 20 pencil hardness tests and the results of determining the acetaldehyde adsorption characteristics of each heating element 3 in the same manner as in the second example and determining the residual rate after 30 minutes are shown in (Table 2). It was

[0042]

[Table 2]

As is clear from this (Table 2), when alumina or bentonite is used as the inorganic binder, the film hardness is lower than that of the silica anhydrous silicic acid colloidal solution, and when Li silicate or water glass is used, the film hardness is reduced. It can be seen that although the film is improved, the film does not become porous and the adsorption property is lower than that of the silicic acid anhydride colloidal aqueous solution of silica. As described above, by using the silicic acid anhydride colloidal solution of silica as the inorganic binder, a strong coating can be formed without deteriorating the adsorption property.

(Fourth Embodiment) A fourth embodiment of the present invention will be described below.

The chiller A of the first embodiment is formed on the entire outer circumference of a cordierite tube, a mullite tube, an alumina tube, a magnesia tube, a zirconia tube and a calcia tube having the same shape as the quartz tube 10 of the first embodiment. The heating elements 3 in which 1 g of the adsorbents 4 were provided were prepared in the same manner as in Example 1, and a thermal shock test was performed on these heating elements 3 to examine the adhesion of the adsorbents 4. In the thermal shock test, the electric resistance built in each tube was energized, the central surface temperature of the heating element 3 was set at every 25 ° C., and the temperature was held for 10 minutes at each temperature, and then dropped in room temperature water. The presence or absence of peeling of the adsorbent 4 was examined, and the maximum temperature at which peeling did not occur was defined as the thermal shock resistance temperature.

The results of the thermal shock test are shown in (Table 3).

[0047]

[Table 3]

As is clear from this (Table 3), the heating element 3 in which the electric resistance is built in the quartz tube 10 can obtain the best adhesion (heat shock resistance).

(Fifth Embodiment) The fifth embodiment of the present invention will be described below.

1000 g of copper ion-exchanged zeolite, 1000 g of colloidal silica having a silica content of 20 wt%, 1200 g of water, 6 g of chloroplatinic acid as Pt and 3 g of palladium chloride as Pd, and thoroughly mixed using a ball mill to prepare slurry B. Was prepared.

700 g of copper ion-exchanged zeolite,
300 g of γ-alumina, 1000 g of colloidal silica having a silica content of 20 wt%, 1200 g of water, 6 g of chloroplatinic acid as Pt and 3 g of palladium chloride as Pd.
In addition, mix thoroughly using a ball mill to form slurry C
Was prepared.

These slurries B and C have an outer diameter of 10 m.
The quartz tube 10 having m, inner diameter 9 mm, and length 330 mm, the central portion of the surface of which is 277 mm, is sprayed, dried at room temperature, and then fired at 500 ° C. for 1 hour. And this and the nichrome wire 9 as an electric resistor
The heating elements B1 and C1 were manufactured using the insulator 11 and the insulator 11. The coating amount of the adsorbent 4 was 0.6 g.

With respect to the heating element A1 formed in the first example and the heating elements B1 and C1 formed in this example, the adsorption and purification characteristics of acetaldehyde, which is one of the odorous components, were measured. The heating elements A1, B1 and C1 were placed in a quartz tube having an inner diameter of 15 mm, air containing 50 ppm of acetaldehyde was passed through the quartz tube at a flow rate of 500 ml / min, and the temperature of the adsorbent 4 was maintained at 25 ° C. for 1 hour. Was heated to 250 ° C. In this test, the acetaldehyde residual rate after 30 minutes and 60 minutes when the temperature of the heating element 4 was set to 25 ° C. and the acetaldehyde content when heating the temperature of the heating element 4 after 90 minutes and 120 minutes to 250 ° C. The results of measuring the residual rate are shown in (Table 4).

[0054]

[Table 4]

As is clear from this (Table 4), 25 ° C.
In the above, the acetaldehyde-containing air was adsorbed by the adsorbent 4, and the remaining rate of all the heating elements A1, B1, C1 was 40% after 60 minutes. However, when the heating element temperature is set to 250 ° C., the remaining rate of the heating element A1 containing no precious metal catalyst is 40%.
%, The heating elements B1 and C containing a noble metal catalyst
The residual rate of 1 was reduced to 5% and 3%, respectively.

As described above, the adsorbent 4 containing the noble metal catalyst has excellent adsorption / purifying characteristics, and the adsorbent 4 containing the noble metal catalyst and active alumina also has excellent characteristics.

In the heating element A1, this is the heating element A
The acetaldehyde adsorbed on the adsorbent 4 of No. 1 is desorbed by heating, but since the heating elements B1 and C1 contain the noble metal catalyst, when the heating element temperature rises, the noble metal catalyst in the adsorbent 4 is activated. This is because the odorous components that have been converted to and are adsorbed on the adsorbent 4 are oxidatively decomposed by a catalytic action.

When the above-mentioned heating element C1 is attached to the dryer and the switch of the dryer is turned on, the heating element 3 in the refrigerator starts to be energized, and the noble metal catalyst in the adsorbent 4 adjacent to the heating element 3 is activated. .. The odorous component is decomposed by the chemical action of the activated precious metal catalyst to become an odorless component. When the heating element 3 is not energized, the odorous component in the air is adsorbed and removed by the adsorbent 4 containing copper ion-exchanged zeolite, which has a high adsorption capacity at low temperature. Thus, the odor can be continuously removed by alternately repeating the adsorption of the odor and the oxidative decomposition of the odor.

[0059]

As is apparent from the above description of the embodiments of the present invention, in the present invention, an adsorbent having a deodorizing function is provided on or near the surface of the heating element, or the adsorbent contains a noble metal catalyst. According to the configuration, it is possible to realize an excellent dryer capable of completely removing odors and harmful gases in the dryer and deodorizing for a long period of time.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing the concept of a heating element of a dryer according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line A-A ′ in FIG.

FIG. 3 is a side sectional view of another heating element of the drier according to one practical example of the present invention.

FIG. 4 is a schematic perspective view of the dryer.

[Explanation of symbols]

 4 Adsorbent 9 Nichrome wire 10 Quartz tube

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location B01J 20/18 D 8516-4G 29/28 A 6750-4G F26B 21/00 G 9140-3L 23 / 06 Z 9140-3L (72) Inventor Hidenobu Wakita 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (6)

[Claims] 1. A drier in which an adsorbent composed of at least zeolite and / or magnesium silicate having a deodorizing function is disposed on or near the surface of a heating element. 2. The adsorbent is at least zeolite and / or
Alternatively, the drier according to claim 1, which is composed of magnesium silicate and an inorganic binder. 3. The dryer according to claim 1, wherein the adsorbent comprises at least a copper ion-exchanged zeolite, a precious metal catalyst, and an inorganic binder. 4. The inorganic binder is silica.
Or the drier according to 3. 5. The dryer according to claim 1, wherein the zeolite is a copper ion exchanged zeolite. 6. The dryer according to claim 1, wherein the heating element is a quartz tube heater.