JPS6017981B2 - Refrigerator with air purifier - Google Patents

Description

Detailed Description of the Invention The present invention relates to a refrigerator with an air purifier, and its purpose is to eliminate nitrogen dioxide (N02) and carbon monoxide (CO), which exist in the air and are harmful to the human body. In order to remove air pollution, the heat released from the refrigerator's compressor is used to heat the air purifying filter installed in the air flow path, increasing the air purifying function and creating a refrigerator with an air purifier that can be easily used in ordinary homes. This is what we are trying to provide.

Large amounts of N02 and CO are generated by combustion in internal combustion engines such as automobiles, large boilers, oil stoves, etc., and if inhaled in large quantities, there is a risk of damage to the lungs and central nervous system and ultimately death.

BACKGROUND ART Conventionally, air purifying equipment has generally been an air purifier having a dust collector, or an air conditioner such as an air conditioner, with a dust collecting pre-filter or activated carbon filter attached thereto.

However, since these devices are expensive and large, they have not been widely used, and there has been a desire to develop a smaller, more easily portable type of air purifying device at a lower price. In addition, as an air purifying filter, it is not only a pre-filter that collects floating dust in the air, but also a filter that collects harmful gases such as N0.
A filter that removes 2 and CO was also desired. Activated carbon is a filter that removes NQ, but its removal capacity is small, so it may reach the end of its life quickly, or it may not be able to remove N02 at high temperatures.
There were problems such as reduction to O and desorption of adsorbed N02 depending on operating conditions. On the other hand, as filters for removing ○, there are metal oxide catalysts such as hopcalite and noble metal catalysts in which precious metals are supported on supports such as alumina.
Metal oxide catalysts can oxidize and remove CO even at low temperatures, but they have the disadvantage that their activity decreases in the presence of moisture.
Furthermore, noble metal catalysts have the disadvantage that they only exhibit their activity at high temperatures. The present invention solves the above-mentioned conventional drawbacks, and also utilizes the heat radiation from the compressor of the refrigerator to install an air flow path and an air purification filter in the flow path to provide an air purification function. This device allows air purification to be carried out easily, and will be explained in detail below according to examples.

Figure 1 is a perspective view showing the air purifying part of a refrigerator equipped with an air purifier. 1 is a refrigerator, 2 is a heat sink, 3 is a broken wire,
4 is an air inlet, 5 is a compressor, 6 is a blower, and 7 is an air outlet.

Indoor air flowing in through the air suction port 4 is flooded with heat radiated from the compressor 5, and is blown into the room through the air outlet T by the blower 6.

A filter is attached to the outlet 7 to remove odor gases and harmful gases such as N02 and CO from the air. FIG. 2 shows a cross-sectional view of the outlet, where 8 represents an air flow path, 9 represents a filter using activated carbon, 10' represents a filter using an N02 removing agent, and 11 represents a filter using a CO oxidation catalyst.

There is a concern that the CO oxidation catalyst may be poisoned by harmful gases in the air and NO emissions, so it was placed downstream of the activated carbon and N02 remover to prevent it from being poisoned.

Incidentally, since the CO oxidation catalyst has a property that its reactivity increases as the temperature increases, the heat dissipated from the compressor 5 can be effectively dissipated from the filters 9, 10, and 11 using activated carbon, the NO2 remover, and the CO oxidation catalyst. The installation location must be chosen so that it can be obtained. However, since it is unstable when it is more than 10,000, it is best to use it at less than 100 qo. The above-mentioned NQ remover is a kneaded molded product (0) of alkali, cement material, and powdered activated carbon, and the alkali is NaOH.
, KOH, Ca(OH)2, Mg(CH)2, K2C0
3, Na2C03, Na2S2Q, and Nabu03 are suitable, and as cement materials, pentonite, diatomite, alumina cement, alumina sol, silica sol, clay, baked stone pipe, Bortland cement, kaolin, water glass, etc. are suitable.

However, in particular, potassium carbonate and calcium hydroxide are used as alkalis, and baked stone pipes (CaS04,
1'240) removed the high performance of N02. Powdered activated carbon is thought to play a role in increasing the surface area of the hybrid wire molding and promoting the reaction between alkali and N02. It is thought that the kneaded molded product and N02 react as described below to remove N02 from the air. 2N
020K2C03→KN030KN020C02 State 02
10Xa (OH) 21Ca (N03) 20Ca (N02)
22nd LO does not respond to NO.

The composition of the kneaded molded product is potassium carbonate: calcium hydroxide: baked stone bone (CaS0401/frame 20): powdered activated carbon =
The mixture was kneaded and molded with water at a ratio of 3:3:2:2 (weight ratio), and then dried.

The CO oxidation catalyst is a catalyst (blood) in which one or more selected from platinum, rhodium, and ruthenium and palladium are supported simultaneously or palladium alone on a carrier made by kneading and molding alkali, cement material, and powdered activated carbon. The procedure for this catalyst carrier was optimized so that the supported substance was supported uniformly over a wide range with a fine particle size, and the specific surface area of the carrier was large and the strength was high. When supporting noble metals, alkali is thought to change the pH of the impregnating solution in which noble metal chloride is dissolved to alkaline, thereby helping the noble metals to be adsorbed onto the carrier in a fine and uniformly dispersed state. It is thought that the powdered activated carbon contributes to the porous physical properties of the carrier, such as increasing the specific surface area of the carrier. Cement material increases the strength of the carrier and is thought to contribute to improving its heat resistance and wear resistance. Potassium carbonate, potassium hydroxide, calcium hydroxide, sodium carbonate, etc. are examples of alkalis, but they are not used. Potassium carbonate was the most suitable in terms of ease and performance.Cement materials include Bortland cement, calcined kudzu, bentonite, alumina cement whose main component is lime aluminate, etc., but alumina cement was the most suitable in terms of performance. The reason for this is thought to be the cocatalytic effect of ferric oxide and calcium oxide contained in alumina cement.Also, it is assumed that alumina plays a role in forming a stable support as a binder. .Precious metals such as platinum, rhodium, ruthenium, and palladium were used as supporting materials. Palladium, which is relatively inexpensive, becomes a highly active catalyst when used alone or in combination with other noble metals, and in particular, the combination of platinum and palladium has a synergistic effect. The effect was demonstrated and remarkable oxidation activity was obtained.Therefore, CO
For the filter 11 using an oxidation catalyst, it is preferable to use a kneaded molded product of potassium carbonate, lime aluminate, and powdered activated carbon that supports platinum and palladium at the same time. The method for preparing this catalyst is as follows.

Potassium carbonate is used as the alkali, alumina cement is used as the cement material, potassium carbonate has a particle size of 100 mesh, and powdered activated carbon has a particle size of 300 mesh.
The alumina cement used had a composition of 45% or more alumina and 10% or less ferric oxide. The carrier was prepared by weight ratio of 10 parts of potassium carbonate, 3 parts of powdered activated carbon, 6 parts of lime aluminate, and 0.5 parts of sodium carboxymethyl cellulose (CMC) as a binder, and kneaded and molded with water. After the kneaded material is sufficiently dried, 8 to 20
It was classified into a mesh and used as a carrier. After thoroughly drying the above carrier, it was soaked in a solution containing palladium and platinum to effect adsorption. Palladium and platinum are each 0 for the mortar.
．． The amount was adjusted so that 3x% was adsorbed. The adsorbed carrier was reduced with sodium borohydride and thoroughly dried to obtain a catalyst. In the present invention, as described above, the activated carbon, N02 remover, or CO oxidation catalyst layer constituting the filter is provided in the air passage of the electric hot air fan, so that the following effects can be obtained.

FIGS. 3 and 4 show the case of operating a refrigerator with an air purifier to which the present invention is applied, 'i}, and the case of no air purifier, 'o}, when the ventilation frequency is 1. N0 when tested in a 6 tatami room (interior volume 29.3〆) with phantom sub/hr
2 concentration and CO concentration. The refrigerator with air purifier has a flow rate of 4.0 min, and the filter structure consists of a granular activated carbon filter 9, an N02 remover filter 10, and a CO oxidation catalyst layer filter 11 from the front, and each layer has a thickness of 3 on the side. The filter area was 20×1 ratio. The filter was installed so that when the heat generating part generated heat, the amount of heat was 80 qo or less. Measurements were made by simultaneously injecting N02 and CO into indoor air at 25°C and 62% humidity.
21.0, the concentration was set on the COlQ side, the hot air fan was operated, and the concentration attenuation was measured using a non-dispersive infrared CO analyzer and a chemiluminescent NO wide analyzer. As a result, Figure 3,
As shown in Figure 4A, when the present invention is used, N02 is rapidly removed at high performance and becomes close to 0 within about 30 minutes, and CO also rapidly decreases within 30 minutes. This was confirmed. As mentioned above, the present invention can reduce the amount of N02 and C generated from gas stoves, oil stoves, etc. in the home.
It has become possible to efficiently purify O and create a state with less harmful gases.

Therefore, by using the refrigerator with air purifier of the present invention, even in urban areas or near expressway toll collection offices where N02 and CO concentrations are high, it is possible to live under conditions with low NQ and CO concentrations. Air purifier using C
Since the temperature of the O oxidation catalyst layer utilizes heat radiation from the compressor, it is higher than the temperature of the catalyst layer applied to other air cleaning devices, so CO can be removed with high performance. Moreover, the heat generating part (heater) required to raise the temperature of the CO oxidation catalyst layer is also unnecessary, and a great effect can be expected from the aspect of energy saving.

[Brief explanation of the drawing]

Figure 1 is a cutaway perspective view of the main parts of a refrigerator with an air purifier.
Fig. 2 is a cross-sectional view of the air passage, Fig. 3 is a change in N02 concentration showing a comparison between the present invention and a conventional example, and Fig. 4 is a change in CG agricultural rate. 5...Compressor, 6...Blower, 8...Air flow path, 9,1
0,11...Fill evening--. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. In a refrigerator, a refrigerator compressor is provided in an air flow path in which indoor air is sucked in and blown out by a blower, and one or more types selected from the following (I) and (II) and ( III)
A refrigerator with an air purifier, characterized in that a filter consisting of (III) or (III) is provided, and the filter is heated by heat radiation from a compressor. (I) Activated carbon (II) Kneaded molded product of alkali, cement material, and powdered activated carbon (III) One or more selected from platinum, rhodium, and ruthenium and palladium are added simultaneously or to a carrier obtained by kneading and molding alkali, cement material, and powdered activated carbon. Catalyst 2 supporting palladium alone In (II) constituting the filter,
Potassium carbonate or calcium hydroxide is used as the alkali, and calcined gypsum (CaSO_4・1/2H_
2O). 3. The refrigerator with an air cleaner according to claim 1, wherein in (III) constituting the filter, potassium carbonate is used as the alkali and lime aluminate is used as the cement material. 4. The refrigerator with an air purifier according to claim 1, wherein in (III) constituting the filter, a catalyst on which platinum and palladium are simultaneously supported is used. 5. The refrigerator with an air purifier according to claim 1, wherein (III) constituting the filter is installed downstream of the air flow path.