JP3041386U - Filter- - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] The present invention relates to a metal filter,
The present invention relates to a filter mainly composed of a breathable metal porous body having a three-dimensional network skeleton structure. SOLUTION: A pre-filter material directed to the flow of exhaust gas, a porous corrugated material, and a main filter material having a three-dimensional net-like skeleton structure made of nickel metal are laminated, and the periphery thereof is inwardly U-shaped. A filter surrounded by a metal frame. 1 ... Pre-filter material, 2 ... Corrugated material, 3 ... Main filter-
Material, 4 frame, 5 metal handle, 6 bolt, 7 hole.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a filter made of metal, and more particularly to a filter mainly composed of a breathable metal porous body having a three-dimensional net-like skeleton structure.

[0002]

[Prior art]

 The filter of the present invention will be described below with reference to a grease filter provided inside the canopy for separating and removing oil mist and dust in the exhaust gas of the kitchen equipment, but it can be used as a general air filter. Needless to say, of course, it can be used for other purposes, for example, as an oil mist separator for removing oil mist generated when the cutting oil used for cutting metal is scattered in the factory at the exhaust duct inlet. .

As a conventional grease filter (hereinafter, simply referred to as a filter), a so-called baffle type filter is often used, which is formed by bending a stainless steel plate with a gap through which air passes, and bending and combining it. However, this type of filter has drawbacks such as low oil mist collection / removal capability, large pressure loss, and large intake noise.

For the purpose of solving this problem, there is an integral type filter made of a ceramic or a nickel porous body. Although this filter solves the above-mentioned problems, on the other hand, there are new problems that the filter is difficult to clean, the weight is heavy, and the ceramic porous body is easily broken. Further, the collected oil is less likely to flow out than the filter, and in this respect, there is a problem that the recoverability is poor.

[0005]

[Problems to be solved by the device]

 The present invention solves these problems, and provides a filter that maintains oil mist collection / removal efficiency, reduces pressure loss, reduces weight, and improves the ability to collect oil adhering to the filter. .

[0006]

[Means for Solving the Problems]

 The present invention has been devised to solve the above problems, and its gist is a main filter composed of a pre-filter material directed to the flow of exhaust gas, a porous corrugated material, and a breathable metal porous body. -The material is laminated, and the periphery thereof is inwardly surrounded by a metal frame material having a U-shaped cross section-.

More specifically, the pre-filter material selected from a punching metal material, an expanded metal material, and a three-dimensional mesh-like metal porous body that are directed toward the flow of exhaust gas, and a punching metal material or an expanded metal material. A porous corrugated material formed by molding a material and a breathable metal porous main filter material having a three-dimensional mesh-like skeleton structure made of nickel metal are laminated, and a metal frame with a U-shaped cross section inwardly surrounding the material. It is characterized by being surrounded by wood.

In particular, as a breathable metal porous main filter having a three-dimensional network skeleton structure made of nickel metal, nickel plating is applied to the surface of a polyurethane foam having a three-dimensional network skeleton structure by electroplating. Nickel metal or nickel-chromium alloy (hereinafter referred to simply as nickel metal in the present invention) obtained by heat-treating this and then subjecting it to chromium plating, and then subjecting it to chromium plating. It is best to use an air permeable porous metal main filter material having a three-dimensional mesh-like skeleton structure (including alloys with other metals).

[0009]

[Embodiment of the invention]

 The present invention divides the function required by the filter into a plurality of functions, and uses a plurality of members corresponding thereto to provide a characteristic filter.

The prefilter used in the present invention preferably uses an expanded metal material or a punching metal material, and the cost thereof is a stainless steel plate having a thickness of 0.1 to 1.0 mm. The size of the substantially rhombic opening of the expanded metal material is in the range of 2 × 4 mm to 12 × 24 mm, and the expanded metal material forms slits in a steel plate in a zigzag shape. Obtained by stretching in the direction perpendicular to the slit. On the other hand, the aperture ratio of the punching metal material that can be opened by press working is preferably in the range of 30 to 70%. This is because if it is less than these limits, the pressure loss mainly becomes high and it is difficult to put it to practical use, and if it exceeds the limits, it will not serve as a prefilter.

As the pre-filter, other members similar to those used for the main filter material described later can be used as they are. When using such a member, it is preferable that the porosity is slightly larger than that of the main filter material, and that the porosity is slightly thinner than that of the main filter material.

This pre-filter is intended to collect a little large dust or oil mist in the exhaust gas here, and the fact that such dust and the like reach the main filter as it is is that the oil of the main filter is It is not preferable because it reduces the mist collection / removal efficiency and increases the pressure loss.

The porous corrugated plate located in the middle is obtained by corrugating the expanded metal plate or punching metal plate used in the above-mentioned prefilter by pressing or the like. This porous corrugated plate is mainly laminated in order to improve the handleability and strength of the filter, and also has a spacer function and an auxiliary filtering function. As a result, the weight is reduced.

The main filter material is a breathable metal porous body, which preferably has a three-dimensional network skeleton structure, the entire structure of which is a cell membrane produced during foaming of the polyurethane foam. It is preferable to have a shape in which is removed. This is because there is no directionality in the air permeability because it has a network skeleton structure that is almost uniform in three dimensions, and this has the greatest feature that there is no directionality in the collection of oil mist. is there.

The breathable metal porous body having such a three-dimensional network skeleton is particularly preferably preliminarily electrically conductive to an open-cell soft polyurethane foam from which the cell membrane having the three-dimensional network skeleton structure has been removed. Conductive treatment is applied to the foam by coating a conductive carbon or by chemical plating, and then nickel plating or multi-layer plating is applied to the whole by electroplating method, for example, copper plating is applied to the central portion, The surface is nickel-plated, and the foam surface is nickel-plated. In some cases, this foam is plated with chrome, and by heat-treating it, the polyurethane foam that has the central skeleton structure is baked to form a three-dimensional mesh of approximately the same shape as the polyurethane foam. A breathable metal porous body made of nickel metal having a skeleton structure is obtained. The heat resistance of the filter obtained by chrome plating can be further improved.

Above all, the main filter obtained by subjecting nickel by electroplating to chromium and chromium is tough, and in terms of microscopic view, no edge is formed on the surface, and the surface is rounded as a whole. It becomes tinged and the strength of the surface increases, and it does not collide with other hard members or use a hard cleaning tool at the time of cleaning so that the filter is not chipped or fine powder is not generated. For this reason, it is extremely hygienic, and the main filter made of a conventional ceramic foam has a toughness and a brittle point, but is largely different.

That is, although the ceramic foam filter has a three-dimensional net-like skeleton, its microscopic surface is brittle and has many sharp edges. It is often seen, and it was pointed out that it may be mixed in the food being cooked and is not good for hygiene, but the present invention has greatly improved this point. Furthermore, the main filter obtained by electroplating does not have edges formed on the surface, and the surface is rounded as a whole, so that the finger may be scratched during cleaning. There is also the feature of disappearing.

At the point of applying nickel to the surface of the polyurethane foam, the polyurethane foam may be dipped in a nickel slurry solution and dried / baked. For example, a metal or oxide powder such as nickel, copper, iron or the like having an average particle size of 1 to 15 μm, a phenol resin, a diluent, a thickener and the like are used to obtain a slurry liquid, and a polyurethane foam is contained in the slurry liquid. A nickel metal that is formed by immersing a foam and heat-treating the polyurethane foam, which has the central skeleton structure, to form a three-dimensional mesh-like skeleton structure having almost the same shape as the polyurethane foam. A breathable metal porous body is obtained.

The breathable metal porous body having a three-dimensional mesh-like skeleton structure constituting this main filter has a porosity of 90 to 97% and a mesh size of 8 cells per 25 mm length. It is preferably from 20 to 20. If the porosity is less than this, the pressure loss is high and it is difficult to put it into practical use. If the number of cells is too small, the collection efficiency of oil mist becomes poor, while if the number of cells is large, the number of cells is large. This causes a problem that the pressure loss becomes large and the collected oil is difficult to remove.

Although the filter is completed by surrounding the periphery with a metal frame after forming the above three-layer structure, it is particularly preferable that the frame that is the lower side of the filter when the filter is used is It is preferable to perforate a racetrack shape (long hole) at least in the center of the filter, because this is for the oil collected during the use of the filter to flow down, and for the cleaning water to be applied. This is because it is easy for oil and dust that have separated from the filter to quickly flow out of the filter during cleaning.

[0021]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. First, the main filter having a three-dimensional mesh-like skeleton structure will be described. A soft polyurethane foam having a thickness of 14 mm from which the cell membrane formed in the bone is removed is used, and a conductive carbon is used. To make the surface of the foam conductive and then nickel-plated by electroplating, and then chrome-plated, followed by heat treatment to form a skeleton polyurethane foam. The metal was fired to obtain a metal filter composed of a nickel-chromium alloy and having the three-dimensional network structure of the polyurethane foam as a raw material almost unchanged. This main filter had 15 cells and a porosity of 94%.

As described above, this main filter has a smooth surface and no sharp edges, so it has high strength and toughness, and even if it comes into contact with or collides with a hard object. It has the characteristic that it does not fall into pieces.

On the other hand, a slit of a thin plate of stainless steel (SUS304) having a thickness of 0.5 mm was made, and this was stretched to obtain an expanded metal material. The shape of the opening was 4 × 8 mm. Then, the expanded metal material obtained here was formed into a corrugation having a wave height of 10 mm by pressing.

FIG. 1 is a perspective view showing a first embodiment of a filter of the present invention, and FIG. 2 is a partial sectional view thereof. In the figure, 1 is a pre-filter material using the expanded metal material described above, 2 is a corrugated material of the expanded metal material described above, 3 is a main filter described above. It is surrounded by a stainless steel (SUS304) frame member 4. The frame body 4 had a thickness of 0.7 mm and a frame width of 20 mm. In the figure, reference numeral 5 is a metal handle, and the frame member 4 has its corners welded or bolts 6 fastened. In addition, in the frame member 4, a hole 7 is formed in a portion (including a ridge line portion) which is a lower side when used, and is used for removing oil and the like. In particular, in many cases, the filter is obliquely arranged and used, but in this case, the existence of the holes 7 formed in the ridge has a great advantage in removing oil and the like.

It is needless to say that the arrow indicates the flow direction of the exhaust flow, and the pre-filter material of the filter of the present invention is opposed to this flow. In this example, it goes without saying that a punching metal material and a corrugated material obtained by processing the punching metal material may be used instead of the expanded metal material.

FIG. 3 shows a second example of the filter of the present invention. As the pre-filter material 1, a breathable metal porous body of the same material as the main filter material and having a three-dimensional mesh structure is used. In this case, it is of course possible to adopt a material having properties similar to those of the main filter material 3, and this has the convenience of eliminating the front-back relationship (direction) as a filter. Considering only as 1, it is preferable to use a material having a mesh slightly larger than that of the main filter 3 or a thickness slightly smaller than that of the main filter 3.

In particular, the grease filter must be a non-combustible material and must have non-ignitability and heat resistance, whereas the filter of the present invention is made entirely of metal and has heat resistance and corrosion resistance. It is a non-combustible material, has an excellent oil removal rate, and has a high suction rate, which not only has the advantage that hot air does not accumulate in the kitchen, but it also has high mechanical strength and alkali resistance. It is a filter that is strong, has a long life without partial chipping, and is excellent in hygiene.

Specifically, since the grease filter of the present invention has an excellent oil mist removal rate, it prevents the oil mist from entering the duct, suppresses the fire of the duct, has a small static pressure, and has a ventilation function. Since it has good air permeability, it can suppress the temperature rise in the kitchen, is less likely to be clogged, has a small change (increase) in static pressure over time, and has a large porosity and good ventilation. It can be maintained for a long time, prevents the diffusion of oil mist, does not pollute the interior of the room, furniture, etc. Furthermore, it does not cause cracking or chipping of the main filter and has a long life. It is especially suitable as a grease filter in the kitchen.

Hereinafter, an experiment was conducted on the main filter in accordance with Fire Service Code No. 162, “Standards for Structure of Grease Removal Device, etc.” dated August 15, 1996. (Test filter: 500 × 500 mm) The results are shown in Table 1.

[0030]

[Table 1]

From these results, it can be seen that the grease removal rate, the adhesion rate, the pressure loss, etc. are all superior to the conventional filter.

[0032]

[Effect of the invention]

 Since the filter of the present invention is entirely made of metal, it has excellent durability such as impact resistance, alkali resistance, and thermal shock resistance, and has a large porosity, so it is lighter than conventional filters made of ceramics, for example. , Operation and handling such as installation and replacement cleaning work become easy. Further, since the main filter has a three-dimensional network skeleton structure having a large porosity, it has excellent air permeability and an excellent oil mist removal rate. And above all, the edge of the main filter does not exist on the surface of the main filter, so it is not missing, which is extremely hygienic and does not scratch the hand during handling such as cleaning. It is also excellent in terms of safety.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a filter of the present invention.

FIG. 2 is a partial cross-sectional view of the filter shown in FIG.

FIG. 3 is a partial cross-sectional view showing a second example of the filter of the present invention.

[Explanation of symbols]

 1 ... pre-filter material, 2 ... corrugated material, 3 ... main filter material, 4 ... frame body, 5 ... metal handle, 6 ... bolt, 7 ... long hole.

Claims (13)

[Utility model registration claims] 1. A pre-filter material directed to the flow of exhaust gas,
A filter characterized in that a porous corrugated material and a main filter material made of a permeable metal porous material are laminated, and the periphery thereof is inwardly surrounded by a metal frame material having a U-shaped cross section. 2. The filter according to claim 1, wherein the pre-filter material is selected from punching metal material, expanded metal material and three-dimensional mesh metal porous body. 3. The filter according to claim 1, wherein the porous corrugated material is formed by corrugating a punching metal material or an expanded metal material. 4. A main filter made of a gas permeable porous body.
The filter according to claim 1, wherein the material has a three-dimensional network skeleton structure. 5. A porous air-permeable metal main filter material, which is obtained by subjecting a polyurethane foam having a three-dimensional network skeleton structure to a conductive treatment, and then electroplating the entire surface of the polyurethane foam to nickel. The filter according to claim 4, which has a three-dimensional network skeleton structure made of nickel metal obtained by plating and heat-treating the polyurethane foam. 6. An air permeable porous metal main filter material, wherein a polyurethane foam having a three-dimensional network skeleton structure is dipped in a nickel slurry solution and heat-treated to burn the polyurethane foam. The filter according to claim 4, which is a three-dimensional network skeleton structure made of nickel metal obtained by the above. 7. The filter according to claim 1, wherein the air-permeable porous metal main filter material has a porosity of 90 to 97%. 8. A breathable metal porous body main filter having a three-dimensional mesh-like skeletal structure, the mesh size of which is 25 m in length.
The filter according to claim 4, wherein the number of cells per m is 8 to 20. 9. The expanded metal material and punching metal material constituting the pre-filter material and the porous corrugated material are stainless steel plates having a thickness of 0.1 to 1.0 mm. Filter of. 10. The filter according to claim 2, wherein the size of the opening of the expanded metal material is in the range of 2 × 4 to 12 × 24 mm. 11. The aperture ratio of the punching metal material is 30.
The filter according to claim 2 or 3, wherein the range is from 70% to 70%. 12. The filter according to claim 1, wherein a racetrack-shaped hole is formed at least in the metal frame member located at the lower side when the filter is used. 13. A pre-filter material selected from a punching metal material, an expanded metal material, and a three-dimensional mesh metal porous body directed to the flow of exhaust gas, and a porous corrugated material formed by molding a punching metal material or an expanded metal material. Polyurethane foam having three-dimensional network skeleton structure
Air-permeable porous metal main filter having a three-dimensional net-like skeleton structure made of nickel metal obtained by nickel plating on the surface of the film by an electroplating method and then heat-treating this to form a polyurethane foam. A filter characterized by being laminated with a material and being surrounded inward by a metal frame material having a U-shaped cross section.