JP2013027807A - Grease filter and grease removal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight and high-strength grease filter having a low pressure loss while maintaining a high removal rate of an oil.SOLUTION: This grease filter made of a plate-like metal porous body having a three-dimensional net-like structure includes an uneven shape pattern at least on one face side. The one face side is an air suction face side, the uneven shape pattern is a waveform wherein a linear projecting part and recessed part are alternately repeated, and the linear projecting parts in the uneven shape pattern consist of a plurality of straight lines, and are disposed such that the extension direction of the plurality of straight lines is two or more directions in the one face including the uneven shape pattern.

Description

  The present invention relates to a grease filter and a grease removing device, and more particularly to a grease filter and a grease removing device made of a porous metal body having a three-dimensional network structure.

  Conventionally, metal powder is attached to a highly permeable resin skeleton with a three-dimensional network structure such as urethane foam with a binder, and then heated to a high temperature in an inert atmosphere. A method of obtaining a porous metal body having a three-dimensional network structure is known by a method of bonding and a method of depositing a metal layer on the surface of a resin skeleton by performing electroplating after electroless plating or conductive treatment. These porous metal bodies are used as heat-resistant filters that capture oil mist, dust, and the like.

As prior arts related to these, there are Patent Documents 1 to 4. Patent Document 1 discloses a method of manufacturing an electrode by mixing metal powder into a foam before foaming, pyrolyzing the foam and sintering the metal powder.
Patent Document 2 discloses that electroplating is performed after electroless plating is applied to a resin skeleton among those using electroplating.
Further, Patent Document 3 discloses that electroplating is performed after a conductive paint is applied to a resin skeleton among those using electroplating.
Patent Document 4 discloses that a grease filter is formed using a porous metal body having a three-dimensional network structure described in the above document.

JP 53-067836 A JP-A-57-174484 JP-A 61-223196 JP-A-6-285317

  In a grease filter made of a porous metal body with a three-dimensional network structure, increasing the thickness of the grease filter increases the amount of oil mist that is captured and the oil removal rate increases, but the grease filter itself becomes heavier. In addition, the pressure loss at the grease filter increases. In addition, reducing the thickness of the grease filter reduces the weight of the grease filter and reduces the pressure loss at the grease filter, but the oil removal rate is lower and the strength is reduced. May be damaged by impact, friction, compression, etc.

  Accordingly, an object of the present invention is to provide a grease filter and a grease removing device that are light in weight and low in pressure loss while maintaining a high oil removal rate.

In order to solve the above-mentioned problems, a grease filter comprising a plate-like metal porous body having a three-dimensional network structure is provided with a grease filter having an uneven pattern on at least one surface side.
According to this, the concave portion of the concavo-convex pattern provided on the intake surface side can reduce the average thickness of the grease filter and reduce the overall weight of the grease filter as compared with those having no concave portion. As a result, the grease filter can be easily replaced, transported, and handled during cleaning. In addition, as the average thickness of the grease filter decreases, air pressure loss in the grease filter can be reduced, and even when a fan with the same airflow is used, the intake performance is improved and the kitchen environment can be kept clean. .

  Furthermore, an uneven pattern may be provided on the intake surface side. By providing the concavo-convex pattern on the intake surface side, even if the surface area of the intake surface increases and the average thickness decreases, the oil capturing effect can be maintained and a good oil removal rate can be maintained.

Furthermore, the concavo-convex pattern may be a wave shape in which linear convex portions and concave portions are alternately repeated.
According to this, the corrugated shape in which linear convex portions and concave portions are alternately repeated is more resistant to impact, friction and compression than the point-shaped concave and convex shapes, so that it can be damaged during replacement, transportation and cleaning of the grease filter. Can be prevented. In addition, in the corrugated shape in which linear convex portions and concave portions are alternately repeated, even if the grease filter is attached with the intake surface facing downward or inclined to an overhang, the oil has a dot shape as compared with the dot-like uneven shape. Since it does not concentrate on the convex part, there is little oil dripping.

Furthermore, the linear convex part in the concavo-convex pattern is composed of a plurality of straight lines, and the extending directions of the plurality of straight lines are arranged so that there are two or more directions on one surface including the concavo-convex pattern. Also good.
According to this, since there are a plurality of linear protrusions having different directions, the strength against bending loads in multiple directions can be ensured without being weakened by bending load in a specific direction.

Further, the grease filter may include at least two types of uneven patterns.
According to this, since there are corrugations having different shapes and corrugations having different pitch widths, strength against bending loads in multiple directions can be ensured without being weakened by bending loads in specific directions. .

Furthermore, one pattern (I) in the concavo-convex pattern and another pattern (II) in the concavo-convex pattern are wave shapes in which linear convex portions and concave portions are alternately repeated, and the pattern (II) That the convex part and the concave part of the pattern (I) are inverted shapes, and that the pattern (I) and the pattern (II) are arranged in a certain positional relationship on one surface having the concave and convex shape. It may be a feature.
According to this, when the profile process mentioned later is performed, two grease filters which have the same uneven | corrugated shape can be obtained.

Furthermore, one pattern (I) in the concavo-convex pattern and another pattern (III) in the concavo-convex pattern are wave shapes in which linear convex portions and concave portions are alternately repeated, and the pattern (III) The pattern (I) is a pattern obtained by rotating the pattern (I) on one surface having the concavo-convex pattern, and the pattern (I) and the pattern (III) are arranged in a certain positional relationship on the one surface. It may be a feature.
According to this, although it becomes weak to the bending load of a specific direction if it is a waveform of one direction, intensity | strength can be ensured with respect to the bending load of a multi-direction.

Furthermore, the pattern (III) is a pattern having a shape obtained by rotating the pattern (I) by 90 degrees on one surface thereof, and may be arranged on either the top, bottom, left, or right of the pattern (I). .
According to this, the strength can be ensured regardless of the bending load in any direction.

Furthermore, the linear convex part in an uneven | corrugated shaped pattern may consist of curves.
According to this, since a linear convex part is a curve, it does not become weak to the bending load of a specific direction, and can ensure intensity | strength with respect to the bending load of a multi-direction.

Further, the exhaust surface side of the grease filter is a flat surface, and the ratio of the maximum distance from the exhaust surface to the convex portion in the vertical direction to the minimum distance from the exhaust surface to the concave portion in the uneven pattern is 1.1 or more and 3 or less. It is good also as a feature.
According to this, the balance between the increase in the surface area of the intake surface of the grease filter and the securing of the strength is good.

Further, the exhaust surface side of the grease filter is a flat surface, and the difference between the maximum distance from the exhaust surface to the convex portion and the minimum distance from the exhaust surface to the concave portion in the uneven pattern is 3 mm or more. It may be a feature.
According to this, the balance between the increase in the surface area of the intake surface of the grease filter and the securing of the strength is good.

According to another aspect, there is provided a grease removing device in which the above-described grease filter is arranged so that the uneven shape pattern is on the intake surface side.
According to this, the average thickness of the grease filter can be reduced and the weight of the grease device can be reduced due to the concave portions of the concave / convex shape pattern provided on the intake surface side, compared with those having no concave portion. In addition, as the average thickness of the grease filter decreases, air pressure loss in the grease filter can be reduced, and even when a fan with the same airflow is used, the intake performance is improved and the kitchen environment can be kept clean. A grease removing device can be provided.

  As described above, according to the present invention, a grease filter and a grease removing device that are light in weight and low in pressure loss while maintaining a high oil removal rate, and further, a grease filter and a grease removing device that have high strength. An apparatus can be provided.

The figure which shows the uneven | corrugated shaped pattern in the inlet surface of the grease filter which concerns on this invention. The figure which shows the variation of the uneven | corrugated shaped pattern in the inlet surface of the grease filter which concerns on this invention. The figure which shows the intake surface to which various uneven | corrugated shape patterns of the grease filter which concerns on this invention are applied (the 1). The figure which shows the inhalation | air_intake surface to which various uneven | corrugated shaped patterns are applied of the grease filter which concerns on this invention (the 2). The figure which shows the intake surface to which various uneven | corrugated shape patterns of the grease filter which concerns on this invention are applied (the 3). The figure which shows the intake surface to which various uneven | corrugated shape patterns of the grease filter which concerns on this invention are applied (the 4). The figure which shows the oil removal test with respect to the grease filter which concerns on this invention.

  The present invention is described in detail below. The present invention is a grease filter comprising a plate-like metal porous body having a three-dimensional network structure, and having a concavo-convex pattern on at least one surface side.

  First, a method for forming a concavo-convex pattern on the intake surface side of the grease filter will be described. In general, as a method for forming a concavo-convex shape on the surface of a flexible foam such as urethane foam, cutting such as profile processing or CF cut processing is used. In particular, profile processing is suitably used as a processing method for forming a regular uneven shape. An uneven pattern is also formed on the urethane foam and melamine foam as raw materials for the metal porous body used in the grease filter according to the present invention by the above cutting.

  Profile processing is generally performed as follows. Profile processing is performed by using two pressing rolls in which a predetermined uneven pattern to be applied to the surface of urethane foam or the like is formed on each outer peripheral surface by projections, and sandwiching and pressing urethane foam or the like between them. Done.

  More specifically, the two pressing rolls are rotated in opposite directions so that the protrusions correspond to each other, and urethane foam or the like is supplied between the pressing rolls. If it does so, both surfaces, such as a urethane foam, will be narrowed with a press roll, and the urethane foam etc. in this compression and a deformation | transformation state will be cut | disconnected by a cutting | disconnection means (for example, blade) along a feed direction between two press rolls. If it does so, a predetermined | prescribed uneven | corrugated shape pattern is formed in a cut surface, and two plate-shaped urethane foams etc. in which the predetermined | prescribed uneven | corrugated shape pattern was formed in the one surface can be obtained.

  The other surface, such as urethane foam, on which the uneven pattern is not formed remains the initial shape of urethane foam or the like, and is usually a flat surface. In the grease filter according to the present invention, preferably, the surface on which the uneven pattern is formed is used as an intake surface of the grease filter, and the other surface on which the uneven pattern is not formed is used as an exhaust surface of the grease filter. Is done.

  Next, the metal porous body used for the grease filter according to the present invention will be described. This metal porous body can be produced by a known method. For example, using urethane foam, which is an open-cell resin foam having a three-dimensional network structure without cell membrane, and performing electroplating after conducting this treatment, directly depositing metal by electroless plating, metal powder Using a method such as slurrying and impregnating the skeleton with a metal, etc., the metal is attached to the skeleton of a three-dimensional network structure such as urethane foam, and then fired in a reducing atmosphere, and only the metal skeleton is deposited. A porous metal body can be obtained.

  The porous metal body used for the grease filter according to the present invention thus obtained has a three-dimensional network structure without a cell membrane, and this three-dimensional network structure forms a three-dimensionally continuous space. . Oil in the oil mist is sucked from the suction surface of the grease filter, collides with the metal skeleton while passing through the space, and most of the oil in the oil mist is removed before reaching the exhaust surface. It becomes.

  Generally, nickel or a nickel alloy is used as the metal as the base of the porous metal body used in the grease filter. These are preferable because they are alkali- and acid-resistant and chemically stable metals. Also in the metal porous body in this invention, it does not specifically limit, The metal used for the metal porous body generally used for a grease filter can be used. When using grease filters, oil adheres to the metal skeleton and clogs occur, so the oil is regularly cleaned and removed, but it is washed with an alkaline agent such as caustic soda that has a cleaning effect. The filter is required not to be attacked by alkali even when immersed for a long time, and nickel or a nickel alloy is preferable in this respect.

  In the porous metal body used for the grease filter, the number of cells is generally 5 to 40 cells / 25 mm, and the apparent specific gravity is 0.1 to 0.8. Also in the metal porous body used for the grease filter concerning this invention, it does not specifically limit, The metal porous body generally used for a grease filter can be used.

  The grease filter according to the present invention has a surface provided with the concavo-convex pattern by applying the above-described plating or the like to a urethane foam or the like provided with the concavo-convex pattern formed by the above-described cutting process on at least one surface side. Said metal porous body is produced.

  In a grease filter made of a porous metal body having a three-dimensional network structure and having a concavo-convex pattern on at least one surface side, the concavo-convex portion is provided by a concavo-convex pattern provided on at least one surface side. The average thickness of the grease filter is reduced and the overall weight of the grease filter can be reduced as compared with the case without it. Moreover, you may provide an uneven | corrugated shaped pattern in the intake surface side which hits one side of a grease filter.

  As a result, the grease filter can be easily replaced, transported, and handled during cleaning. In addition, as the average thickness of the grease filter decreases, air pressure loss in the grease filter can be reduced, and even when a fan with the same airflow is used, the intake performance is improved and the kitchen environment can be kept clean. . Further, when the concave-convex pattern is provided on the intake surface side, even if the surface area of the intake surface increases and the average thickness decreases, the oil capturing effect can be maintained and a good oil removal rate can be maintained.

  The concavo-convex pattern may have a shape in which dot-like convex portions and concave portions are alternately repeated as shown in FIGS. 1A and 1B, or linear convex portions and concave portions are not point-like shapes. It may be a wave pattern that repeats alternately. The corrugated shape in which linear convex portions and concave portions are alternately repeated is different from the shape in which dotted convex portions and concave portions are alternately repeated in that the cross-sectional shape on the intake surface side of the grease filter in the cross section perpendicular to the linear line is Also, it refers to a shape with little change even by parallel movement of the cross section.

  Specifically, the concavo-convex shape pattern of the intake surface shown in FIG. 2A (A1) has a cross-sectional shape by a surface perpendicular to the straight line, in which convex portions and concave portions that are linear in plan view (intake surface) are alternately repeated at regular intervals. The concavo-convex pattern shown in FIG. 2A (A2) is perpendicular to the tangent line of the curved line (waveform), in which convex portions and concave portions having a planar (intake surface) view curve (waveform) shape are alternately repeated at regular intervals. The cross-sectional shape by the surface is a corrugated shape, and FIG. 2A (D1) is a corrugated shape in which convex portions and concave portions in a plane (intake surface) viewpoint are alternately repeated at regular intervals. 2A to 2D, points or lines represented on the intake surface represent vertices or ridges that are convex portions.

  Waveforms with alternating linear convex and concave portions are more resistant to shock, friction, and compression than point-shaped concave and convex shapes with protrusions on the convex portions, so they are damaged when replacing, transporting, and cleaning grease filters. Can be prevented. In addition, in the corrugated shape in which linear convex portions and concave portions are alternately repeated, even if the grease filter is attached with the intake surface facing downward or inclined to an overhang, the oil has a dot shape as compared with the dot-like uneven shape. Since it does not concentrate on the convex part, there is little oil dripping. Therefore, the concavo-convex pattern preferably has a wave shape in which linear convex portions and concave portions are alternately repeated.

  In the grease filter using the concavo-convex pattern (the concavo-convex pattern shown in FIGS. 2A (A1) and (A2)) in which linear (straight and curved) convex portions that are continuous in a plan view are arranged in a wave shape, If the ridge line that is the convex part is not horizontal, that is, if the ridge line that is the convex part and the exhaust surface are parallel, the straight line connecting both ends of the continuous linear convex part should be inclined so that it does not become horizontal The oil adhering to the surface of the filter is preferable because it gathers on the linear convex portion by gravity and easily flows along the linear convex portion.

  Therefore, when the straight line connecting both ends of the continuous linear convex portion is parallel to the exhaust surface, it is preferable to install the grease filter with an inclination without directing the intake surface itself directly below. Conversely, when installing the grease filter with its intake surface facing directly below, if the straight line connecting both ends of the continuous linear convex portion is not horizontal to the exhaust surface and is inclined in a certain direction, the ridge line of the convex portion That is, it is preferable because a straight line connecting both ends of the continuous linear convex portion is not horizontal but is inclined. Further, if the straight line connecting both ends of the continuous linear convex portion is made to approach the vertical direction, the oil after adhering easily flows and the adhering oil is easily collected.

  Note that the dot pitch in the shape in which the dot-like convex portions and the concave portions are alternately repeated as shown in FIG. 1A is 21 mm, and the dot pitch in the shape shown in FIG. 1B is 11 mm. In addition, the wave pitch in the corrugated shape in which linear convex portions and concave portions are alternately shown in FIG. 1C is preferably 5 mm or more and 25 mm or less.

  The dot-shaped uneven pattern has the corrugated pattern in which the protrusions of the pressing roll have the dot-shaped uneven pattern, and the linear protrusions and recesses are alternately repeated. These projections are produced by having a wave pattern in which linear convex portions and concave portions are alternately repeated.

  The grease filter according to the present invention may further include at least two types of uneven patterns on the intake surface side. Since there are corrugations having different shapes and corrugations having different pitch widths, the strength can be ensured against bending loads in multiple directions without being weakened by bending loads in a specific direction.

  The grease filter according to the present invention further includes one pattern in the concavo-convex pattern and another pattern, that is, two or more types of corrugated concavo-convex patterns, of which the two types of concavo-convex pattern have the same line A corrugated shape in which convex and concave portions are alternately repeated may be used. The wave shape in which the same linear convex and concave portions are alternately repeated is that when the line is a straight line, the straight lines are parallel to each other in the same direction, and when the line is a curve, the shape and curvature of the curve are the same. In addition, the pitch of the corrugations in which the convex portions and the concave portions are alternately repeated is the same, the height difference between the convex portions and the concave portions is the same, and the shape of the concave and convex shape pattern itself (rectangle, rhombus, hexagon, circle, etc. ) Or the same size. Therefore, even if the number and length of straight lines and curves are different, they are regarded as the same pattern.

  That is, the other pattern is a pattern in which one pattern is rotated on the intake surface, and the one pattern and the other pattern may be alternately arranged on the intake surface. In other words, of the two or more types of corrugated concave / convex patterns, one corrugated concave / convex pattern is equivalent to the other corrugated concave / convex pattern that is translated and rotated on the intake surface.

  In other words, when the line is a straight line, the linear direction of the straight convex part and the concave part constituting the corrugation in one corrugated uneven pattern, and the straight line constituting the corrugation in the other corrugated uneven pattern The straight direction of the convex portion and the concave portion is not parallel. With such a configuration, the unidirectional corrugation weakens the bending load in a specific direction, but the strength can be ensured against the bending load in multiple directions.

  Furthermore, in the grease filter according to the present invention, the linear protrusions in the concavo-convex pattern are composed of a plurality of straight lines, and the extending directions of the plurality of straight lines are two or more directions on one surface including the concavo-convex pattern. It may be arranged. Here, two or more directions means that a plurality of straight lines or their extending directions are not parallel to each other. With such a configuration, since there are a plurality of linear protrusions having different directions, the strength against bending loads in multiple directions can be ensured without being weakened by bending load in a specific direction. In addition, the linear length of the linear convex part and recessed part in 1 pattern is about 20 mm-100 mm.

  Preferably, the other pattern is a pattern having a shape obtained by rotating one pattern by 90 degrees on the intake surface. In other words, when the line is a straight line, the linear direction of the straight convex part and the concave part constituting the corrugation in one corrugated uneven pattern, and the straight line constituting the corrugation in the other corrugated uneven pattern The straight direction of the convex portion and the concave portion of the shape forms a right angle. If three types of patterns are included, the waveform in which the same linear irregularities are alternately repeated may be rotated with respect to each other with a relationship of 0 °, 45 °, and 90 °.

  Furthermore, the other patterns are preferably arranged alternately on the top, bottom, left and right of the one pattern. With such a configuration, the strength can be ensured regardless of the bending load applied in any direction.

  More specifically, FIGS. 2A (A1) and (A2) show one type of concavo-convex pattern, and the strength is weakened by simply arranging each pattern alternately in the same direction up, down, left, and right. Since there is a direction, if the pattern shown in the figure is one pattern, the pattern rotated 90 ° is another pattern, and alternately arranged vertically and horizontally, the strength is ensured regardless of the bending load in any direction. be able to.

  In FIG. 2A (B1) to (C2), since a plurality of uneven patterns are already represented in this uneven shape, as shown in FIG. 2B and FIG. If they are arranged alternately, the strength can be ensured regardless of the bending load applied in any direction. FIG. 2A (B1) shows a concavo-convex pattern in which two types of straight lines rotated by 90 ° are arranged with a certain width. If these four patterns (the part surrounded by the rectangular dotted line) are handled as one unit, the concave and convex shapes of the two left patterns are reversed among these four patterns, and the two right patterns are Formed, and their inverted shapes are arranged diagonally. For this reason, when a plate-like urethane foam or the like is cut at the center in the thickness direction by the profile processing cutting means, two grease filters having exactly the same uneven shape can be obtained.

  2A (B2), like FIG. 2A (B1), represents a concavo-convex pattern composed of linear convex portions perpendicular and parallel to the sides of the rectangle within one unit of the rectangle. As shown in FIG. 2B, this pattern can also ensure strength regardless of the bending load applied in any direction if the patterns are alternately arranged in the same direction in the vertical and horizontal directions.

  2A (C1) to (C3) show a concavo-convex pattern composed of linear convex portions that are neither perpendicular nor parallel to the sides of the rectangle within one unit of the rectangle. As shown in FIG. 2C1 and FIG. 2C2, this pattern can also ensure strength regardless of the bending load applied in any direction by arranging the patterns alternately in the same direction vertically and horizontally. Further, since any straight line connecting both ends of the continuous linear convex part, that is, the ridge line of any convex part, does not become horizontal when the grease filter is inclined and installed, the oil adhering to the filter surface becomes linear due to gravity. It is preferable because it gathers at the convex portions and easily flows along the linear convex portions.

  2A (D2) shows a corrugated uneven pattern in which curved (circular) convex portions and concave portions are concentrically repeated at regular intervals. As shown in FIG. 2D, if this pattern is alternately arranged vertically and horizontally in the same direction, the strength can be ensured regardless of the bending load in any direction.

  More preferably, the exhaust surface side of the grease filter is a flat surface, and the ratio of the minimum distance from the exhaust surface to the concave portion with respect to the minimum distance from the exhaust surface to the concave portion in the thickness direction of the concave / convex shape pattern (concave / convex The ratio may be 1.1 or more and 3 or less. In other words, in the concavo-convex pattern, the ratio (split ratio) of the difference between the maximum distance from the exhaust surface to the concave portion to the minimum distance from the exhaust surface to the concave portion with respect to the minimum distance from the exhaust surface to the concave portion is It may be 0.1 or more and 2 or less. Further, the difference between the maximum distance from the exhaust surface to the linear convex portion of the intake surface in the vertical direction and the minimum distance from the exhaust surface to the concave portion of the intake surface may be 1 mm or more and 10 mm or less, preferably 2 mm. It may be 8 mm or less. More preferably, when the thickness of the grease filter (maximum distance from the exhaust surface to the linear protrusion on the intake surface in the vertical direction) is 30 mm, the unevenness ratio is 1.1 and the split ratio is 0.1. 1.

  Such a corrugated corrugation provides a good balance between increasing the surface area of the intake surface of the grease filter and ensuring the strength. That is, as the concavo-convex ratio or split ratio increases, the surface area of the intake surface increases, but the difference in concavo-convex increases, so that the convex portions are easily damaged and the concave portions are easily bent. On the other hand, when the concavo-convex ratio or split ratio is small, the difference in concavoconvex is small, so that the convex part is hard to break and the concave part is difficult to bend. Therefore, if it is in the said range, both will be balanced.

  When the grease filter is sufficiently thick and strong (for example, when the thickness is 30 mm or more), the maximum distance from the exhaust surface to the linear projection on the intake surface in the vertical direction and the intake surface to the intake air The difference in the minimum distance to the concave portion of the surface may be 1 mm or more, preferably 2 mm or more, more preferably 3 mm or more. With such a corrugated corrugated shape, the surface area of the intake surface of the grease filter can be increased, the oil trapping effect can be maintained, and a good oil removal rate can be maintained.

  As shown in FIG. 1, the grease filter according to the present invention is usually a quadrangle whose side is 200 to 500 mm, and is used by being enclosed in a square filter frame. The grease removing apparatus according to the present invention is a grease removing apparatus in which the above-described grease filter is accommodated in a filter frame and arranged so that the concavo-convex pattern is on the intake surface side. The grease removing device includes a hood provided with a grease filter, an intake duct connected to the hood, and an air suction device provided in the intake duct. The hood is provided so as to cover the upper part of the location where the oil vapor is generated, and a part of the hood is opened, and a grease filter housed in a filter frame is installed on the upstream side of the opening. An intake duct extends downstream from the hood opening, and a suction device such as a blower for air suction is provided in the flow path of the intake duct. The suction device creates a negative pressure in the intake duct to generate an air flow, air containing oil vapor passes through the grease filter, and after a predetermined oil is removed, flows into the intake duct.

  Various aspects of the present invention will be described. The method for producing a grease filter according to the present invention is a method for producing a grease filter made of a plate-like metal porous body having a three-dimensional network structure, and is made of an open-cell resin foam having a three-dimensional network structure skeleton. The body is molded, and a concavo-convex pattern is formed on at least one surface of the plate-like body by cutting processing such as profile processing or CF processing, and then electroplating after conductive treatment, directly by electroless plating A method for producing a grease filter, comprising attaching a metal to a three-dimensional network skeleton of the plate-like body by at least one of a method of attaching a metal and a method of slurrying and impregnating a metal powder. . In this way, a grease filter made of a plate-like metal porous body having a three-dimensional network structure that is lightweight and has low pressure loss can be easily manufactured.

Below, an Example and a comparative example are given and it demonstrates more concretely.
<Example 1>
The cell membrane was removed, and the conductive foam was applied to the urethane foam (number of cells: 25/25 mm) that had been subjected to profile processing called innocam as shown in FIG. 1 (C). After plating, firing (900 ° C.) was performed in a reducing atmosphere to obtain a porous metal body, that is, a grease filter. The size is 500 × 500 mm square, and the weight is 818 g (grams).

  As shown in FIG. 1 (C), the concavo-convex pattern called inocalm consists of four types of corrugated patterns in which linear convex portions and concave portions are alternately repeated. When a set located at the upper left and c located at the lower right are set as one set, b located at the upper right and d set at the lower left are set as another set, one convex portion of each set becomes the other concave portion. It becomes a shape in which the unevenness is inverted. Also, a and b have substantially the same uneven shape pattern, the a uneven shape pattern is a pattern obtained by rotating the b pattern by 90 degrees, and c and d have substantially the same uneven shape pattern, The concave-convex pattern c is a pattern obtained by rotating the pattern d by 90 degrees, and is arranged adjacent to each other. The corrugated pitch width is 10 to 15 mm, and the lengths of the straight protrusions and recesses in one pattern are 25 to 35 mm.

  The thickness of the porous metal body, that is, the maximum distance from the exhaust surface to the linear protrusion on the intake surface in the vertical direction is 10 mm. Further, the ratio (concave / convex ratio) of the maximum distance from the exhaust surface to the convex portion in the vertical direction to the minimum distance from the exhaust surface to the concave portion in the concave / convex shape pattern is 1.5 (3/2). The ratio of the minimum distance from the exhaust surface to the concave portion to the minimum distance from the exhaust surface to the concave portion with respect to the minimum distance from the exhaust surface to the concave portion in the shape pattern is 0.5 ( 1/2). Further, the difference between the maximum distance from the exhaust surface to the linear convex portion of the intake surface in the vertical direction and the minimum distance from the exhaust surface to the concave portion of the intake surface is 3.3 mm.

  In the grease filter produced as described above, the pressure loss was 16.2 Pa (pascal), and the oil removal rate was 91.3%. The method for measuring and evaluating the pressure loss and the oil removal rate will be described later.

<Example 2>
The uneven ratio of the grease filter is 2 (2/1), the split ratio is 1 (1/1), and the weight is 735 g. Others are the same as the first embodiment.
As a result, the pressure loss was 13.4 Pa, and the oil removal rate was 87.5%.

<Example 3>
The uneven ratio of the grease filter is 3 (3/1), the split ratio is 2 (2/1), and the weight is 653 g. Others are the same as the first embodiment.
As a result, the pressure loss was 11.3 Pa, and the oil removal rate was 84.3%.

<Example 4>
The profile processing of the grease filter is P-1 having a shape in which dot-like convex portions and concave portions are alternately repeated as shown in FIG. The weight is 820 g. Others are the same as the first embodiment.
As a result, the pressure loss was 15.8 Pa and the oil removal rate was 90.6%.

<Example 5>
The number of cells of the urethane foam used is 20/25 mm. The apparent specific gravity of the grease filter is 0.3 and the thickness is 20 mm. The weight is 1225 g. Others are the same as the first embodiment.
As a result, the pressure loss was 18.2 Pa, and the oil removal rate was 92.9%.

<Example 6>
The apparent specific gravity of the grease filter is 0.18, and the weight is 368 g. Others are the same as the first embodiment.
As a result, the pressure loss was 15.2 Pa, and the oil removal rate was 90.6%.

<Comparative example>
The grease filter is not profiled and the intake surface is flat. The thickness of 10 mm is the distance between the intake surface and the exhaust surface. The weight is 980 g. Others are the same as the first embodiment.
As a result, the pressure loss was 20.3 Pa, and the oil removal rate was 90.5%.

<Contrast of Examples and Comparative Examples>
Comparing Example 1 with the comparative example, the thickness, apparent specific gravity, and number of cells are the same, but in Example 1, the profile processing (Inokam) was applied to the intake surface side, so that the portion of the intake surface by the recess on the intake surface The weight decreased, and the weight of the comparative example was 818 g with respect to the weight of 980 g, and the weight was reduced by about 17%. Further, in Example 1, due to the profile processing recess, the pressure loss was also reduced by about 20% to 16.2 Pa, compared to 20.3 Pa in the comparative example.

  On the other hand, the oil removal rate is 91.3% in Example 1 compared to 90.5% in the comparative example, and the overall weight is reduced and the average thickness is reduced. Since the surface processing was increased by applying profile processing to the oil, the oil removal rate was improved.

  Comparing Example 1 and Example 2, Example 2 has a larger unevenness ratio and split ratio than Example 1, the degree of unevenness on the intake surface is increased, and the surface area is larger. On the other hand, since the overall weight is reduced and the average thickness is reduced, the pressure loss of Example 2 is reduced to 13.4 Pa compared with 16.2 Pa of Example 1, but the oil removal rate is 4% worse. However, in view of the fact that the guidebook of the Japan Kitchen Industry Association, the oil removal rate is 75% or more as a requirement required for the grease filter, the oil removal rate in Example 2 sufficiently satisfies the requirement. To meet.

  When Example 1 is compared with Example 3, Example 3 has a larger unevenness ratio and split ratio than Example 1, and the degree of unevenness on the intake surface is larger than that of Example 1, and the surface area is increased. It is getting bigger. On the other hand, since the overall weight is reduced and the average thickness is reduced, the pressure loss of Example 3 is reduced to 11.3 Pa, but the oil removal rate is further deteriorated by about 3%. However, in view of the fact that the guidebook of the Japan Kitchen Industry Association, the oil removal rate is required to be a grease filter that the oil removal rate is 75% or more, the oil removal rate in Example 3 sufficiently satisfies the requirement. To meet.

  Comparing Example 1 and Example 4, Example 4 has a profile processing shape different from Example 1, and P-1 has a shape in which point-like convex portions and concave portions are alternately repeated on the intake surface. It is a grease filter. Both weights are almost the same. Although the pressure loss of Example 4 is smaller than that of Example 1, the oil removal rate is 90.6%, which is slightly lower than Example 1, because the surface area is larger than the profile processing of Example 1. . On the other hand, it is needless to say that Example 1 has a qualitatively excellent point (strong against impact, friction and compression, and oil does not easily drip), which does not appear in these numbers, as described above.

  When Example 1 and Example 5 are compared, Example 5 has a smaller apparent specific gravity and a thickness twice that of Example 1. As a result, the weight of the grease filter is about 50% heavier. Needless to say, the oil removal rate is improved, but even if the thickness is doubled, the pressure loss is larger than that of Example 1, but 2 Pa or more smaller than that of Comparative Example. This is because the surface area of the intake surface is increased by performing profile processing on the intake surface. In other words, it can be said that providing an uneven shape on the intake surface has an effect that the pressure loss does not increase so much even if the thickness of the grease filter is increased.

  When Example 1 is compared with Example 6, the apparent specific gravity of Example 6 is 0.18, which is less than half that of Example 1. As a result, the weight was 368 g, which was 60% or more compared to the comparative example and about 55% lighter than that of Example 1. Furthermore, the pressure loss was further improved, and the oil removal rate was 90.6, which was slightly inferior to Example 1, but showed the same performance as Comparative Example 1. This is because the surface area of the intake surface is increased by performing profile processing on the intake surface. In other words, it can be said that providing an uneven shape on the intake surface has an effect that the oil removal rate does not decrease so much even if the apparent specific gravity of the grease filter is reduced.

<Measurement and evaluation method>
As shown in FIG. 3, the oil removal test is generally performed as follows based on the guidebook of the Japan Kitchen Industry Association. First, the grease filter 1 is disposed with an inclination of 45 degrees with respect to a horizontal plane, with the distance between the lower limit of the grease filter 1 and the heater 4 being about 45 cm. Oil (vegetable oil) and water are dripped simultaneously into the oil vapor generation container 3 set to keep the temperature at 270 ° C. to generate oil vapor. The oil supply is about 13 g (about 10 drops for 10 seconds) for 5 minutes, and the water supply is about 40 g (about 30 drops for 10 seconds) for 5 minutes. The wind speed in front of the grease filter 1 is adjusted to an average wind speed of 1.1 m / second to 1.2 m / second by adjusting a damper for air volume adjustment (not shown). The test time is 4 consecutive hours. The oil and fat captured by the grease filter 1 is collected in the grease collecting toy 2.

Based on the data measured as described above, the oil removal rate is obtained by the following equation.
Oil removal rate (%) = (Grease collection container collection amount (g) + Grease filter adhesion amount (g)) ÷ Oil use amount of oil vapor (g) × 100

The pressure loss is a pressure difference between the inlet pressure (upstream static pressure) and the outlet (downstream static pressure) when the grease filter is used at the rated air volume. The pressure loss is measured using a fine differential pressure gauge.
Pressure loss (Pa) = Upstream static pressure (Pa)-Downstream static pressure (Pa)

  In addition, this invention is not limited to the illustrated Example, The implementation by the structure of the range which does not deviate from the content described in each item of a claim is possible.

1 Grease filter 2 Toy for grease collection 3 Oil vapor generation container 4 Heater

Claims (12)

In a grease filter made of a plate-like metal porous body having a three-dimensional network structure,
A grease filter having a concavo-convex pattern on at least one side.   The grease filter according to claim 1, wherein the one surface side is an intake surface side.   The grease filter according to claim 1, wherein the concavo-convex pattern has a wave shape in which linear convex portions and concave portions are alternately repeated.   The linear protrusions in the concavo-convex pattern are composed of a plurality of straight lines, and the extending directions of the plurality of straight lines are arranged such that there are two or more directions on one surface including the concavo-convex pattern. The grease filter according to claim 3.   The grease filter according to any one of claims 1 to 4, wherein the grease filter includes at least two types of uneven patterns. One pattern (I) in the concavo-convex pattern and the other pattern (II) in the concavo-convex pattern are wave shapes in which linear convex portions and concave portions are alternately repeated,
The pattern (II) has a shape in which the convex portion and the concave portion of the pattern (I) are inverted,
6. The grease filter according to claim 5, wherein a plurality of the patterns (I) and the patterns (II) are arranged in a fixed positional relationship on one surface having the uneven shape. One pattern (I) in the concavo-convex pattern and the other pattern (III) in the concavo-convex pattern are wave shapes in which linear convex portions and concave portions are alternately repeated,
The pattern (III) is a pattern having a shape obtained by rotating the pattern (I) on one surface provided with the concavo-convex pattern,
The grease filter according to claim 5, wherein a plurality of the patterns (I) and the patterns (III) are arranged in a fixed positional relationship on the one surface.   The pattern (III) is a pattern having a shape obtained by rotating the pattern (I) by 90 degrees on the one surface, and is arranged on either the top, bottom, left, or right of the pattern (I). Item 8. The grease filter according to Item 7.   The grease filter according to claim 3, wherein the linear convex portion in the concave-convex pattern is a curve. The exhaust surface side of the grease filter is a plane,
The ratio of the maximum distance from the exhaust surface to the projection in the vertical direction to the minimum distance from the exhaust surface to the recess in the uneven pattern is 1.1 or more and 3 or less. Item 10. The grease filter according to any one of Items 2 to 9. The exhaust surface side of the grease filter is a plane,
The difference between the maximum distance from the exhaust surface in the vertical direction to the convex portion and the minimum distance from the exhaust surface to the concave portion in the uneven pattern is 3 mm or more. The grease filter in any one.   12. A grease removing apparatus in which the grease filter according to claim 1 is arranged so that the concavo-convex pattern is on the intake surface side.