JPH05253427A - Filter - Google Patents

Abstract

PURPOSE:To obtain a filter which is washed with an alkaline cleaner and has high oil droplet adhesion performance by filling a gas permeable vessel with an alkali-resistant inorganic particles. CONSTITUTION:Gas permeable vessels formed by alkali-resistant metal 6, 7 are filled with alkali-resistant inorganic particles 5. The alkali-resistant inorganic particles 5 are alumina, zeolite, etc., formed into granules, excel in oil holding performance, have high lipophilic property and is suitable for the adsorption of soot. And since the inorganic particles have high alkali-resistant performance, they are reused if the inorganic particles on which oil is stuck are washed with alkaline water solution in several times. Besides, the opening rate of the gas permeable vessels 6, 7 is >=60-70% and the section on the soot source side of a filter 3 is formed into uneven surface, such as corrugated-shape, chevron, etc. Thereby a soot passing surface is made large to keep pressure loss small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter capable of removing oil smoke and suspended matter, and more particularly to a filter having a high removal performance and capable of cleaning oil and the like with an alkaline cleaner and reusing it. is there.

[0002]

2. Description of the Related Art Exhaust gas containing oil smoke and minute suspended matter generated from a kitchen gas range, for example, is discharged to the outside after removing oil smoke and the like through an exhaust duct 2 as shown in FIG. That is, the ventilation fan 4 is provided at the outlet of the exhaust duct 2.
Is provided, and the grease filter 3 is provided at the inlet. A baffle structure made of metal such as aluminum is used as the grease filter 3, and the oil smoke generated in the gas range 1 is attached to the filter 3 as an oil drop, and the oil smoke or the like is directly emitted to the outside, or This prevents oil droplets from adhering to the ventilation fan 4. As the filter 3, in addition to the above aluminum, a non-woven fabric made of glass fiber, organic fiber or the like may be used.

[0003]

However, the adhesion of the oil droplets to the filter 3 reaches saturation within a short period of time, and thereafter the adhered oil droplets drop. Therefore, the filter 3 is to be cleaned, but this cleaning is quite troublesome, so it may be replaced with a new one. However, there is a problem of high cost and waste of resources for making the filter disposable, and improvement of cleaning property is desired.

By the way, when cleaning oil, an alkaline cleaning agent such as sodium hydroxide is generally used. However, aluminum filters are easily corroded by alkalis, and non-woven fabrics made of glass fiber are also dissolved in an alkaline solution, so neither is suitable for cleaning. Further, glass fibers have a problem of floating short fibers like asbestos fibers, and care must be taken in handling them, and they are not suitable for general household use. On the other hand, the non-woven fabric made of organic fiber has low heat resistance and may cause a fire, and is not suitable for kitchen.

Therefore, it has been considered to apply ceramic foam as a filter, but since this ceramic filter is an integrally molded porous molded body, there is a problem in impact strength, it is inconvenient to handle, and it drops. There is an inconvenience that it is easily damaged by. A filter having a multi-layered structure of stainless steel wire mesh is also considered, but in order to remove oil droplets, it is necessary to stack layers with a thickness of 50 to 200 mm, which makes the filter large and heavy. There is an inconvenience that it will end up. In view of the above problems, an object of the present invention is to provide a filter that can be cleaned with an alkaline cleaning agent, has no problem in terms of handling and heat resistance, and has high oil drop adhesion performance. ..

[0006]

DISCLOSURE OF THE INVENTION The present invention, which has achieved the above object, is a filter capable of efficiently removing oil fumes, suspended solids, and the like, and washing and reusing the same. The gist of the present invention is that the gas-permeable container formed by is filled with alkali-resistant inorganic particles.

[0007]

The alkali-resistant inorganic particles used in the present invention are
An alkali-resistant inorganic material such as alumina, zeolite, or apatite is formed into particles, and an organic binder is used in the process of forming the particles, or other materials within the limit of maintaining alkali resistance as a whole. It is within the technical scope of the present invention to incorporate an inorganic component such as silica from the viewpoint of improving the strength of the molded body.

As shown in Table 1, the oil retention performance of the alkali-resistant inorganic particles such as alumina, zeolite, apatite, etc. shown above shows a large value, and the lipophilicity is higher than expected and the adsorption of oil fumes is high. Proved to be suitable for.

[0009]

[Table 1]

However, the values in Table 1 are obtained by immersing each raw material particle in a commercially available salad oil for 1 minute and then leaving it in the air for 24 hours to sufficiently drop and dry the oil content, and measure the weight change before and after the immersion. Then, the oil retention amount was obtained.
Further, when the alkali resistance performance of the inorganic particles was examined,
For example, the weight loss after soaking in 0.1N sodium hydroxide for 16 hours is as shown in Table 2, and it was found that the alkali resistance performance was considerably high. Therefore, the inorganic particles to which oil is attached can be reused if washed with an alkaline aqueous solution many times.

[0011]

[Table 2]

However, the values in Table 2 are obtained by immersing each material particle in a hot alkali solution at 60 ° C. for 16 hours, then leaving it in the air at room temperature for 24 hours, and drying it at 120 ° C. in a heating environment for 2 hours. The weight change was measured to determine the dissolution loss of particles. Further, since the inorganic particles can be filled in a breathable container made of punching metal or mesh to have a filter shape, the particles are not damaged by an external force such as an impact at the time of dropping, and there is no inconvenience in handling. Absent.

The size of the particles is preferably in the range of 1 to 15 mm, and if it is less than 1 mm, the diameter of the vent hole of the container to be filled must be reduced, resulting in high pressure loss and poor air permeability. Problems such as particle leakage and drop occur. On the other hand, if it exceeds 15 mm, the contact area with oily smoke is reduced and the oil efficiency is reduced. Still more preferably 2
Within the range of 10 mm. When the particle size is large, it is desirable to use porous particles, but when it is made into a porous body, it also functions as an adsorbent, so for example, a secondary effect of removing odorous components from the kitchen gas range. The effect is also obtained.

The opening ratio of the air permeable container is required to be 60 to 70% or more, but in order to mitigate the large pressure loss, the cross section of the filter toward the oil smoke source is corrugated, chevron, trapezoidal, etc. The uneven surface is formed. As a result, the oil smoke passing area is increased, the apparent open area ratio can be increased, and the pressure loss can be suppressed low.

More preferably, (a) to (d) of FIG.
As shown in, the particle filling chamber is fractionated so as to correspond to the uneven surface. According to this structure, the particles are not biased toward the filling piece due to the inclination during the handling, the distortion of the mounting angle, etc., and the particles can be stably and uniformly distributed over the entire surface. Therefore, uneven flow of the air flow passing through the filter will not occur and the oil removal rate will not become unstable. Further, by densely packing the particles with a constant thickness on the entire surface of the filter, it is possible to suppress the movement of the particles in the filter, and it is possible to eliminate the offset of the packing, but the porosity at this time is the size and shape of the particles,
Furthermore, it fluctuates depending on their variations, but is about 25
% Or less, the pressure loss as a filter may become too high to be practical. On the other hand, if the uneven surface is formed, the filling thickness of the particles can be adjusted by changing the height, so that the ventilation performance and removal performance of the filter can be improved by changing the number and height of the uneven surfaces. It can be adjusted and selected to the optimum size and shape depending on the application and filter size.

[0016]

1 (a) to 1 (f) are explanatory views showing the cross-sectional shape of the filter 3 of the present invention, showing an example in which a punching metal or a wire mesh is used as a gas permeable container. (A) and (b) are those in which only the punching metal 6 on the oil and smoke source side that forms the filter surface is formed in an uneven shape, and the flat plate-shaped punching metal 7 is used on the opposite side. In the space between the metal 7, alumina, zeolite,
The inorganic particles 5 such as apatite are filled, and the peripheral edges of the punching metals 6 and 7 are held by the frame body 9.

(C) and (d) show an example in which punching metals 6 and 7 on both sides are formed in an uneven shape. Also (e),
(F) is a further improvement of (a) and (b) and shows an example in which a demister formed by the metal nets 8 and 10 is arranged on the side opposite to the oil and smoke source. Besides these examples, one or a plurality of metal nets may be used instead of the punching metals 6 and 7.

Example 1 A thin plate made of SUS 304 having a thickness of 0.2 mm was provided with holes having a diameter of 2 mm at an aperture ratio of 60%, and as shown in FIG. No. 6 was used, the apparent open area ratio was about 85%, and the punching metal 7 on the opposite side was a flat plate-shaped hole with a diameter of 2 mm formed at an open area ratio of 60%. Filled with ~ 6 mm alumina particles. Example 2 A SUS 304 plate having a flat plate shape (diameter: 2 mm, porosity: 60%) was used on both front and back surfaces of the filter, and a particle size of 4 to 6 was provided therebetween.
mm alumina particles packed to a thickness of 10 mm were used. Comparative Example A conventional filter mainly made of glass fiber non-woven fabric was used. Using these filters, the pressure loss and the oil adhesion performance when the wind speed was 1.5 m / sec were investigated and the results in Table 3 were obtained.

[0019]

[Table 3]

As is clear from the results shown in Table 3, it can be seen that the examples of the present invention exhibit the oil content adhering performance more than double that of the conventional example. It was found that the pressure loss can be significantly reduced by using a punching metal having an uneven surface on the oil smoke source side of the filter forming surface.

[0021]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, it is possible to efficiently remove oils and the like in exhaust gas,
Moreover, even if it is washed with an alkaline cleaning liquid, it is possible to reuse it many times without causing a large amount of erosion and the like, and it becomes possible to prevent waste of resources.

[Brief description of drawings]

1 (a) to 1 (f) are cross-sectional explanatory views showing a typical embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of an exhaust duct.

[Explanation of symbols]

 1 Gas range 2 Exhaust duct 3 Filter 4 Ventilation fan 5 Inorganic particles 6,7 Punching metal 8,10 Wire mesh

Front Page Continuation (72) Inventor Yasuhiro Nagai 100-1 Urakawachi, Miyamae, Fujisawa City Kamido Steel Works, Ltd. Fujisawa Works

Claims (2)

[Claims] 1. A filter capable of removing oil fumes, suspended matter, and the like, which can be washed and reused, wherein an air-permeable container made of an alkali-resistant metal is filled with alkali-resistant inorganic particles. A filter characterized by that. 2. The filter according to claim 1, wherein at least the oil smoke source side of the filter forming surface of the breathable container is formed as an uneven surface.