JP4095684B2 - Grease filter for range hood fan - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a grease filter for a range hood fan.
[0002]
[Technical background]
A range hood fan installed above the cooking device installed in the kitchen is equipped with a grease filter that captures oil and fat contained in oil smoke and waste gas at the front opening.
As such a grease filter, a so-called slot filter is known that has a high air trapping efficiency and excellent cleanability while having less ventilation resistance than a conventional grease filter (for example, Japanese Utility Model Publication No. 2-43456). Issue).
In this slot filter, a large number of slits are arranged in parallel on a thin metal plate, several slit rows are formed, and the whole tongue piece defined by the slits in each row is refracted and inclined in one direction for ventilation. It has a structure with many mouths.
In this slot filter, the vents are opened obliquely due to the inclination of the tongue pieces, so that waste gas such as oil smoke and hot air generated during cooking passes meanderingly without passing straight through the vents. Since the collection efficiency is higher than that of the punching metal and is formed by cutting and raising from a thin metal plate, the cleaning efficiency is better than that of a lath net or a metal net, and a stable function can be exhibited over a long period of time.
[0003]
[Problems to be solved by the invention]
By the way, in recent years, there has been a demand for a filter that is more efficient in oil collection than the above-described slot filter due to environmental problems, and has a lower wind noise during exhausting in order to improve comfortability. Yes.
However, as a real problem, the current situation is that we cannot answer that request.
The present invention has been made in view of the above-described conventional circumstances, and an object thereof is a grease filter for a range hood fan that has higher oil collection efficiency than conventional slot filters and reduces noise during exhaust. Is to provide.
[0004]
In order to improve oil collecting efficiency and reduce noise during exhaust, the present inventors intervene various filter materials presumed to be effective between the two-layer slot filters as well as the two-layer slot filters. As a result of extensive research, it is possible to improve oil collection efficiency by using a slot filter and expanded metal in combination, and making the long and short dimensions of the expanded metal rhomboid opening smaller than a certain dimension. And it discovered that the wind noise at the time of exhaust_gas | exhaustion can be reduced, and came to this invention. That is, the present invention provides a filter (a1) (a1) 1 or two of expanded metal between two sheets of (a2) a sandwich structure of intervening three or four layers, wherein the filter (a1) (a1) is A plurality of horizontally long slits (1) are arranged in parallel in the vertical direction at a pitch of several millimeters on a thin metal plate, and a plurality of slits (1) arranged side by side are provided as a unit. 1) A structure in which a plurality of elongated rectangular vents (4) are formed by bending slanted plate pieces (3) partitioned from each other in one direction, and the expanded metal (a2) has a rhomboid opening O The gist of the present invention is a mesh configuration in which the long dimension LW is less than 1.5 mm and the short dimension SW is less than 0.75 mm.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 thru | or FIG. 5 has shown the grease filter A for range hood fans of this Embodiment.
[0006]
As shown in FIG. 1, the range hood fan grease filter A has a structure in which one or two expanded metals a2 are interposed between two filters a1 and a1.
[0007]
The filter a1 includes a plurality of (eight in this embodiment) sideways slits 1 having a width of about 20 mm in a vertical direction at a pitch of 2 to 5 mm on a metal thin plate having a predetermined size. As shown in FIG. 1, the slit row 2 is provided as a unit in a grid pattern as shown in FIG. 1, and the elongated plate pieces 3 that are partitioned by the slits 1 and 1 are refracted and inclined in one direction to form an elongated rectangular vent. 4 (hereinafter referred to as a slot filter) (see FIG. 2).
[0008]
As shown in FIG. 4, the expanded metal a <b> 2 has a mesh structure of a rhomboid opening O having a plate thickness t of 0.1 mm, a long dimension LW of less than 1.5 mm, and a short dimension SW of less than 0.75 mm. An object is interposed between the slot filters a1 and a1.
In the present embodiment, one or two expanded metals a2 having a long dimension LW of 1.0 mm and a short dimension SW of 0.5 mm are interposed between the slot filters a1 and a1.
[0009]
As shown in FIG. 3, the grease filter A for the range hood fan constructed as described above can be engaged and disengaged across the tip of the lower partition plate 102 of the hood body 100 and the crosspiece 104 provided on the top plate 103. It is supported by.
[0010]
FIG. 5 is an experimental result (table) comparing oil collection efficiency, noise value during exhaust, air volume, and the like between the grease filter of the present invention and another filter. In the measured values of the air volume m ³ / h and the noise value dB (A), the left side is the commercial power source at 50 hertz and the right side is the commercial power source at 60 hertz.
The filter used in the experiment is a two-layer slot filter (experimental example (a)), a polyester mat having a thickness of 5 mm between two slot filters (experimental example (b)), and two slot filters. There are various types such as those in which expanded metals having different longitudinal dimensions LW and short dimensions SW of the rhombus-shaped openings O are interposed (experimental examples (c) (d) (e) (f) (g)).
According to this, in the expanded metal intervening type filter in which the expanded metal a2 is sandwiched between the two filters a1 and a1, when the mesh size of the expanded metal a2 is the size of the experimental example (e), the experimental example Only oil collection efficiency equivalent to (a) and (b) could be achieved.
Then, one layer of expanded metal a2 having a mesh structure (longitudinal dimension LW of rhombus-shaped opening O less than 1.5 mm and shorter dimension SW less than 0.75 mm) finer than the mesh of the experimental example (e) or When two layers are present (experimental examples (f) and (g) (hereinafter referred to as examples of the present invention)), the oil collecting efficiency becomes high as shown in FIG. 5, and the noise value dB (A) during exhaust is increased. In addition to the experimental example (e), the values shown were lower than those of the experimental examples (a) and (b).
If the expanded metal a2 having a coarser mesh than the experimental example (e) is interposed (experimental examples (c) and (d)), not only the oil collecting efficiency is lowered, but also the noise value dB (A) at the time of exhausting. However, it could not be reduced, and favorable results were not obtained.
The measurement of the air volume value and the noise value is based on JIS C 9603.
[0011]
Here, the reason why the oil collection efficiency of the inventive examples (f) and (g) is high is that the long dimension LW of the rhomboid opening O of the intervening expanded metal a2 is less than 1.5 mm, and the short dimension. If the SW is reduced to a mesh configuration of less than 0.75 mm, it is presumed that a capturing portion that effectively captures oil and fat is formed in the waste gas passage between the slot filters a1 and a1.
The noise (wind noise) at the time of exhausting is reduced when the mesh structure is reduced to the mesh configuration, and the mesh portion flows in a meandering manner of the waste gas entering from the vent holes 4 of the suction side slot filter a1. It is presumed that this is because it effectively functions as a silencer that does not collide with each other.
[0012]
【The invention's effect】
As described above, the present invention has a three-layer or four-layer sandwich structure in which one or two expanded metals (a2) are interposed between two filters (a1) and (a1), and the filters (a1) and (a1) A plurality of horizontally long slits (1) are arranged in a vertical direction at a pitch of several millimeters on a thin metal plate, and several slits (2) of the plurality of slits (1) provided side by side are provided as one unit. (1) An elongated plate piece (3) partitioned mutually is refracted and inclined in one direction to form a large number of elongated rectangular vents (4), and the expanded metal (a2) has a rhomboid opening. Since the network configuration is such that the long dimension LW of the portion O is less than 1.5 mm and the short dimension SW is less than 0.75 mm, as is apparent from the table shown in FIG. filter When the polyester mat is interposed, the diamond-shaped opening has a high oil collection efficiency compared to various experimental examples when an expanded metal having a long dimension of 1.5 mm or more and a short dimension of 0.75 mm or more is interposed. A good result was obtained that the wind noise at the time was also reduced. Therefore, a grease filter that is suitable for environmental problems that have become severe in recent years and that also improves the feeling of use (comfortableness) of the kitchen can be newly provided.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a grease filter according to an embodiment.
FIG. 2 is a partially enlarged sectional view of a slot filter.
FIG. 3 is a side sectional view showing a use state.
FIG. 4 is an enlarged view of a mesh portion of expanded metal.
FIG. 5 is a table comparing oil collection efficiency, noise value, air volume, and the like between the grease filter of the present embodiment and another filter.
[Explanation of symbols]
a1: filter (slot filter); a2: expanded metal;
O: diamond-shaped opening; LW: longitudinal dimension;
SW: short dimension; A: grease filter;
1: slit; 4: vent;
2: slit row; 3: plate piece

Claims (1)

The filter (a1) (a1) has a three-layer or four-layer sandwich structure in which one or two expanded metals (a2) are interposed between the two sheets, and the filters (a1) and (a1) are horizontally long on a thin metal plate. A plurality of slits (1) are arranged side by side in the vertical direction at a pitch of several millimeters, and a plurality of slits (1) arranged in parallel are provided as a unit, and the slits (1) are partitioned by each other. The elongated metal piece (3) is refracted and inclined in one direction to form a large number of elongated rectangular vents (4). The expanded metal (a2) has a longitudinal dimension LW of the rhomboid opening O of 1 A grease filter for a range hood, characterized in that it has a mesh configuration of less than 5 mm and a short dimension SW of less than 0.75 mm.

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