JPS6290168A - Deodorizing filter - 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 [Technical Field] The present invention relates to a deodorizing filter for deodorizing and purifying air.

[Background technology]

Air purifiers are commercially available for the purpose of air purification, and various deodorizing filters have been devised for use therein, including the following.

Made of porous granules such as activated carbon and zeolite.

Sheet materials such as woven fabrics, nonwoven fabrics, and polyurethane foams, and carriers made of these materials with porous inorganic materials attached. Furthermore, the above-mentioned carrier is impregnated with various drugs to develop deodorizing effect.
57685, Japanese Patent Publication No. 52-3335, etc.).

However, when these filters are used in an air purifier, a pressure loss occurs, and a motor fan with considerable torque is required to produce a constant amount of air, resulting in an increase in the size of the device. Furthermore, if the torque of the motor is set to a constant value, as the number of filters increases, a greater load will be placed on the air purifier, resulting in a reduction in air volume and the problem of the motor itself generating heat, making the deodorizing effect less effective. Some remain sufficient and have been commercialized.

[Purpose of the invention]

An object of the present invention is to provide a deodorizing filter that has an excellent deodorizing effect and has extremely low pressure loss.

[Disclosure of the invention]

In order to achieve the above object, the present invention provides a sheet-like filter that is used in an air purifier and has a deodorizing effect, and is characterized by having a large number of voids. do.

This will be explained in detail below.

Since the deodorizing filter according to the present invention has a large number of voids, pressure loss can be reduced. Furthermore, since the number of filters can be increased by the amount that the pressure loss is reduced, the deodorizing ability can be increased. The deodorizing filter according to the present invention includes, for example, the first
As shown in the figure. The deodorizing filter 1 has a large number of slit-shaped voids 2. The shape and size of the slit are not particularly limited, but slits with a width of 2 to 5 fins are preferred. In addition, the shape of the cavity is not limited to a slit,
It may be a round or square hole. However, a wide gap is not preferable because it reduces the contact between the air and the deodorizing filter.

A plurality of deodorizing filters as shown in Fig. 1 are arranged as shown in Fig. 2 so that the slits do not overlap. In this product, a plurality of deodorizing filters each having a slit-shaped cavity 2 are lined up, but the slits are further arranged so that the directions of the slits are not the same.
The slits are lined up through multiple filters so that they do not overlap each other. Therefore, the flow of air is not short-circuited (short bus) from the slit to Surin I of the next filter, and the contact between the air and the deodorizing filter increases, increasing the deodorizing effect. Furthermore, as shown in Figure 2, by creating a gap between each filter, the air flow is disturbed or air stagnates, increasing the passage time and increasing the contact between the air and the deodorizing filter. . Furthermore, it is possible to further reduce pressure loss.

Deodorizing filters with voids can be obtained by, for example, providing voids in various carriers such as paper, woven fabric, non-woven fabric, felt, polyurethane foam, etc., and then making these carriers support deodorizing ingredients extracted from plants. It will be done.

Examples of raw material plants include thorn, forsythia, holly osmanthus, osmanthus, black pine, oxalis oxalis, oxalis, and oxalis. The leaves, stems, and
Deodorizing ingredients are obtained from buds, fruits, etc. by thermal extraction using hydrophilic organic solvents such as water and alcohol.

The extraction method from the plant is not limited as long as it is an extraction method for removing odor components from the raw material plant. For example, a hydrophilic organic solvent such as water, an alcohol such as ethanol or methanol, or a ketone such as methyl ethyl ketone or acetone is added to the raw material plant mentioned above, and the deodorizing components are thermally extracted using a Soxhlet extractor or the like. . This extraction operation may be performed using a mixed solvent of these hydrophilic organic solvents and water. The extract obtained in this way is usually used as it is, but if necessary, water or a hydrophilic organic solvent is removed by using a low evaporator or a vacuum dryer to obtain the deodorizing component as a solid. It may be used by dissolving it in an appropriate solvent. The obtained deodorants can be used alone or in combination. Note that the extraction is not performed in one step as described above, but if necessary, odor components of the raw material plant may be eluted and removed in advance using a hydrophobic organic solvent such as hexane or petroleum ether. Alternatively, a steam distillation method may be used.

The method for impregnating a carrier with a plant extract is not particularly limited, but for example, the extract is dissolved in a hydrophilic solvent and impregnated. Additionally, glycerin is added for moisturizing effects, surfactants are added for uniform impregnation, and emulsion adhesives such as vinyl acetate resin and acrylic are added to improve adhesion to the carrier. The resulting system may be impregnated into a carrier and dried.

Separately or in addition to deodorizing ingredients extracted from plants,
In addition to this, porous materials such as activated carbon and zeolites,
A clay mineral having a high cation exchange capacity such as montmorillonite vermiculite may be supported on the carrier.

The porous material has a deodorizing effect by adsorbing odor components, and the clay mineral has a cationic reaction to take in ammonium ions in nitrogen-based odors.

There are no particular limitations on the amount of the porous deodorant or the deodorizing active ingredient derived from plants added to the filter. It is desirable to increase the amount as much as possible.

Next, an example will be described together with a comparative example (Example 1) Oxalis leaves were extracted with hot water to obtain an extract. When a deodorizing evaluation was performed on ammonia, it was found to have a remarkable effect, so it was used as a deodorizing ingredient.

Polyurethane foam (
5+am thickness) and non-woven fabric (2=n thickness), 30cm each.
x 30cm, and each filter has a width of 2 as shown in Figure 1.
30 slits each having a length of 25 CI 1) were opened. These two types of filters were each impregnated with the same amount of the extract from Oxalis to prepare deodorizing filters.

For comparison, a polyurethane foam filter without slits and a non-1M cloth filter were also impregnated with Oxalis extract in the same manner.

In order to evaluate pressure loss, the following experiment was conducted.

The amount of pressure loss was determined by changing the number of five types of filters and sending air at a constant air volume. In addition, when using a filter having slits, the slits were arranged so that they did not overlap. The results are shown in Table 1.

As shown in Table 1, when using a deodorizing filter with slits, even if two layers of polyurethane foam and three layers of nonwoven fabric are stacked, the pressure loss is the same as when no slits are provided. It became possible to increase the number of sheets.

Therefore, among the above filters, ①, 2 pieces of polyurethane foam without slits, 4. 4 sheets of polyurethane foam with slits, 5. 2 pieces of non-woven fabric without slits,
9. The deodorizing effect of five nonwoven fabrics with slits under the same pressure loss was investigated. That is, four types of filters were attached to each air purifier, and the air purifier was operated in an IM acrylic box to see the ammonia deodorizing effect.

Gas was added into the acrylic box so that the initial concentration of ammonia was about 500 ppm. The deodorizing effect is determined by measuring the concentration after 1 hour with a detection tube. Evaluation was made by comparing the seismic intensity and determining the survival rate. The results are shown in Table 2.

As shown in Table 2, even if the deodorizing filters have the same pressure loss, the deodorizing filter with slits has a significantly greater deodorizing effect.

(Example 2) Among the deodorizing filters of the above examples, 4. 4 sheets of polyurethane foam with slits and 9. A filter consisting of five sheets of nonwoven fabric with slits was installed in an air purifier with a spacing of 15 squares between the filters as shown in FIG. 2, and these were designated as 4' and 9'. The deodorizing effect was examined in the same manner as in Example 1 with filters having the same filter configuration as Example 1, 4 and 9. The concentration after 30 minutes was measured with a detection tube and compared with the initial concentration to determine the residual rate. The results are shown in Table 3.

Table 3 As shown in Table 3, it was found that the deodorizing effect was greater when a space was provided between the filters. We also measured the pressure loss with and without a space, and found that when a space was provided, the pressure loss decreased by about 5%, making it possible to obtain an excellent deodorizing filter.

〔Effect of the invention〕

Since the present invention is configured as described above, it was possible to provide an excellent deodorizing filter with extremely low pressure loss.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a deodorizing filter according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the configuration when a plurality of the same deodorizing filters are used. ■... Deodorizing filter 2... Slit-shaped void agent Patent attorney Takehiko Matsumoto Figure 1 Figure 2

Claims (7)

[Claims] (1) A deodorizing sheet filter that is used in an air purifier and has a deodorizing effect, and is characterized by having a large number of voids. (2) The deodorizing filter according to claim 1, wherein the void portion is a slit. (3) Claim 1 or 2, in which a plurality of filters are arranged so that the voids do not overlap.
Deodorizing filter as described in section. (4) The deodorizing filter according to any one of claims 1 to 3, wherein a plurality of filters are arranged at regular intervals. (5) The filter carrier according to any one of claims 1 to 4, wherein the filter carrier is at least one selected from the group consisting of paper, woven fabric, nonwoven fabric, felt, and polyurethane foam. Deodorizing filter. (6) The deodorizing filter according to any one of claims 1 to 5, wherein the deodorizing effect is based on a deodorizing component extracted from plants. (7) The plants are thorns, forsythia, holly osmanthus,
7. The deodorizing filter according to claim 6, which is at least one selected from the group consisting of Osmanthus oleracea, Japanese black pine, Purple Oxalis, Oxalis oxalis, and Houtodyami.