JP5635359B2 - Range hood filter - Google Patents

Description

  The present invention relates to a filter that is installed in a range hood and captures and collects oil and fat contained in an exhaust flow generated during cooking, and in particular, has a large number of ventilation holes through which the exhaust flow passes. It is related with the filter comprised.

As a filter (referred to as a grease filter), a metal thin plate formed in a substantially rectangular shape is provided with a ventilation hole having an exhaust flow collision tongue piece that is cut and raised in one direction and inclined. The structure of the raising structure is known. A so-called cut bend type filter is known (for example, see Patent Document 1).
The filter of Patent Document 1 is provided with a plurality of slit-like holes in one direction perpendicular to the flow direction when an exhaust flow passes through a thin metal plate. The exhaust flow collision tongue piece, which is a flat portion partitioned by the holes, is directed toward one side surface of the metal thin plate (on the exhaust downstream side in the hood installation state) and is refracted and inclined in one direction. By cutting up and down, it is configured to have a vent hole that is opened obliquely in one direction without leaving a plane portion.
As a result, when the exhaust flow passes through the vent hole, the exhaust flow collides with the exhaust flow collision tongue that refracts without passing straight, so that the oil and fat contained in the exhaust flow collides with the exhaust flow. It is attached to the tongue and is collected and recovered.

Conventionally, there is known a filter configured by superposing two filter members each having a large number of ventilation holes through which an exhaust flow passes (see, for example, Patent Document 2).
The filter disclosed in Patent Document 2 includes a front plate and a rear plate each provided with a fitting edge portion that is detachably fitted and connected to the outer peripheral portion. Then, long front holes and rear holes are drilled at a constant pitch on the entire flat surface of each of the front plate and the rear plate excluding the peripheral fitting edge, and the front plate and the rear plate are overlapped. In this case, the front hole of the front plate faces the non-perforated portion of the rear plate, and the rear hole of the rear plate faces the non-perforated portion of the front plate.
As a result, the exhaust flow that has entered from the front hole of the front plate hits the non-perforated portion of the opposing rear plate and flows out from the rear hole of the rear plate while changing the direction. At this time, the oil component in the exhaust flow is attached to the non-perforated portion and separated and captured (captured) by the collision of the exhaust flow with the non-perforated portion of the rear plate or the non-perforated portion of the front plate.

JP-A-9-323012 Japanese Utility Model Publication No. 64-44010

By the way, the filter of the prior art described in patent document 2 is the same size as the front hole and the rear hole, and it is perforated on the whole flat part of each of the front plate and the rear plate at a constant pitch. It is an array.
That is, the lateral width of the non-perforated portion located between the opening width of the front hole and the front hole adjacent thereto is equal, and the non-perforated portion positioned between the opening width of the rear hole and the rear hole adjacent thereto is equal. When the width of the perforated part is made equal and the front plate and the rear plate are stacked, the non-perforated part of the rear plate is opposed to the front hole of the front plate, and the front plate is opposed to the rear hole of the rear plate. The non-perforated part on the rear plate side where the exhaust flow entering from the front hole of the front plate faces because the non-perforated portion of the face plate faces the entire surface of the vent holes facing the non-perforated portion. The amount of collision that hit was low.
Therefore, in the filter of the prior art, dirt such as oil and fat in the exhaust flow, especially dirt and oil, in particular, most of the oil and fat is not collected and adhered to the non-perforated part on the rear plate side, but from the rear hole on the rear plate. In many cases, dirt such as flowing out with the exhaust flow is missed, and there is a problem that the dirt cannot be caught efficiently.

  Accordingly, the present inventors have paid attention to such a problem to be improved and, as a result of intensive studies over many years, have arrived at the idea of the present invention, and have a large number of vent holes through which an exhaust flow passes. This is a range hood filter that can be reliably and efficiently attached (collised) and collected without removing dirt such as oil and fat in the exhaust stream, and a thin metal plate An object of the present invention is to provide a range hood filter that is further improved to improve the cleaning property by increasing the rigidity of the filter itself.

In order to solve the above-mentioned problems, the present invention is a filter that is installed in a range hood and captures oil and fat in an exhaust stream generated during cooking,
A plurality of collective ventilation portions arranged and formed by a collection of a large number of vent holes through which the exhaust flow passes, and a plurality of non-venting portions arranged adjacent to the collective ventilation portions, respectively. A sheet of filter members,
The collective ventilation portion and the non-venting portion are alternately arranged on the two filter members in a positional relationship facing each other when the two filter members are overlaid,
Among the two filter members, the collective ventilation part on at least one filter member side is formed by bulging toward the inside or the outside where the two filter members are overlaid, whereby the collective ventilation part and A step portion is provided between the adjacent non-venting portions .
For example, the collective ventilation portion on the second filter member side that is disposed on the exhaust downstream side of the exhaust flow is formed to bulge toward the inside where the two filter members are overlaid. Alternatively, the collective ventilation portion on the first filter member side that is disposed on the exhaust upstream side of the exhaust flow is formed to bulge toward the outside where two filter members are overlaid. It is preferable to adopt such a configuration that the non-venting portion is formed in an inner surface concave shape or an inner surface convex shape.

In here, the said set vent non vent, of the outer circumferential sides of the two sheets of filter members has a substantially rectangular shape, in a parallel strip toward one of the two sides edges opposite directions It is preferable that they extend and are alternately arranged between the other two opposite edges.

  In addition, the air holes that define and form the collective air vents have a substantially staggered opening arrangement, the opening width is in the range of 0.6 to 1.0 mm, and the opening length is in the range of 7 to 13 mm. It is preferable to adopt a configuration such as being opened in a hole shape, and the collective ventilation part and the non-ventilation part being alternately arranged with a substantially equal width of 20 to 23 mm. It becomes.

According to such a configuration, the collective ventilation part into which the exhaust flow of the first filter member disposed on the upstream side of the exhaust flows flows is formed by a large number of ventilation holes arranged in a substantially elongated shape and in a staggered manner. Due to the parallel strips, the exhaust flow sucked and collected in the range hood (capture space, etc.) flows through the filter through a large number of ventilation holes when passing through the filter. It becomes.
That is, the flow of the exhaust flow is dispersed (rectified) by a large number of air holes in the collective ventilation portion and collides with each non-venting portion facing the second filter member, so that the oil and fat content in the exhaust flow is reduced. Dirt such as dust and dirt adheres to each non-venting part and is collected.

  Further, the collective ventilation portion bulges toward the inside or the outside where two filter members are overlaid. For example, in the case where the collective ventilation portion of the second filter member disposed on the exhaust downstream side is bulged inward, the non-venting portion has an inner concave shape. As a result, dirt such as oil and fat and dust contained in the exhaust flow is attached to the inner non-vented portion and captured and recovered.

According to the filter for the range hood of the present invention, when the exhaust flow sucked and collected in the range hood (capture space or the like) flows from the collective ventilation portion of the first filter member, the flow is a large number of ventilation holes. The dispersed exhaust flow collides with the non-venting part and diffuses, and the diffused exhaust streams collide with each other to adhere oil and fat and dust to the surface of the non-venting part. Can be increased.
In other words, unlike the conventional filter, the exhaust flow is dispersed in comparison with the collective (collective) exhaust flow collision, so that the adhesion (collision) of dirt such as oil and fat contained in the exhaust flow is collected. The rate (capture recovery rate) can be improved.

Further, the exhaust flow can collide with the non-venting portion formed in the concave shape on the inner surface, so that dirt such as oil and fat and dust contained in the exhaust flow can be efficiently attached and collected (captured and recovered).
In other words, the collective ventilation part of the filter member located on the upstream side of the exhaust gas is caused to bulge the collective ventilation part of the filter member located on the exhaust gas downstream side of the exhaust flow toward the inner side where the two filter members are overlaid. The non-venting part where the exhaust flow coming in from the air collides becomes concave on the inner surface having a wide collision surface (area) extending in a band shape, and the collision of the exhaust flow is caused by the concave bottom surface of the non-venting part and the concave rising surface Repeated. Thereby, the adhesion collection rate (capture collection rate) of dirt such as oil and fat and dust due to collision of the exhaust flow can be improved.
In addition, the flow of the exhaust flow immediately after passing through the collective ventilation portion of the filter member on the exhaust upstream side becomes a large number of thin flows dispersed (miniaturized) according to the number of arrangement of the vent holes on the downstream side of the exhaust. It collides with the non-venting part of the filter member. At this time, since the narrow flow collides and interferes with each other and becomes a complex flow, the particles of the dirt in each dispersed thin flow collide with each other and grow large, so that the fat and oil content can be efficiently increased. It is possible to capture and collect dirt such as dust. That is, the fine dirt particles in the exhaust flow can be made to collide with the non-venting portion while being greatly grown and captured and recovered.
Furthermore, the vent holes are arranged in a substantially staggered pattern, so that the arrangement of the positions of the short sides of the vent holes is simply aligned, that is, compared to a so-called grid-like arrangement, for one narrow flow. Since more fine flows are adjacent to each other, more and more fine flows collide and interfere with each other to promote collision growth between dirt particles, and more efficiently capture and collect dirt such as oil and fat and dust.

In addition, the filter member made of a thin metal plate has a stepped portion (concave rising portion) that acts as a reinforcing portion between adjacent non-venting portions by bulging the collective ventilation portion inward or outward. The rigidity with respect to the bending deformation etc. in the plate | board surface direction is improved.
As a result, the user can perform cleaning with a cleaning tool such as a sponge without worrying about the filter member being bent or damaged when cleaning in a sink or the like. Improvement can be expected.

In addition, a large number of vent holes through which the exhaust flow passes are elongated holes, and are opened in a substantially staggered arrangement in which the opening length direction is one direction and the opening long edges are adjacent to each other. As a result, when removing dirt using a cleaning tool such as a brush, the oil and fat collected at one end of the elongated hole shape is prevented from getting entangled between adjacent ones, improving the cleaning performance. It can be removed quickly by washing away dirt.
In addition, the non-venting part arranged adjacent to the collecting ventilation part defined by the collection of ventilation holes is a wide collision closing surface (area) extending in a parallel strip shape, so that it is non-venting using a towel or the like. It can be easily removed by wiping off dirt adhering to the part. Thereby, it can be expected that the cleaning property is remarkably improved as compared with the conventional filter.

It is a perspective view which shows an example of the range hood to which the filter which concerns on this embodiment is applied. It is a front view which shows the 1st filter member among the two filter members which comprise the filter. It is a front view which shows the 2nd filter member. The two filter members are shown, (a) is a perspective view showing the two filter members facing each other, and (b) is an enlarged cross-sectional view showing a part of the stacked state. It is a graph which shows the relationship between the oil capture rate and ventilation resistance of the filter which concerns on this embodiment comprised by overlappingly arranging the two filter members. The two filter members which comprise the filter which concerns on other embodiment are shown, (a) is a perspective view shown in the state made to face, (b) is expanded a part of the state which overlappedly arranged. It is sectional drawing shown. It is a modification of the filter which concerns on other embodiment, and is sectional drawing which expands and shows a part in the state which piled up two filter members.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 is a perspective view showing an example of a range hood to which a filter according to this embodiment is applied.

  As the range hood to which the filter A according to the present embodiment is applied, a thin range hood configured to include a thin (flat) hood portion having a shallow capture space, and as shown in FIG. A deep range hood configured to include a deep hood portion in which the capture space M is deeply formed can be exemplified.

≪Description of filter configuration≫
2 and 3 are front views respectively showing a first filter member and a second filter member of the two filter members constituting the filter according to this embodiment, and FIG. 4 shows the two filter members. It is sectional drawing which expands and shows a perspective view of the state made to face, and a part of the state of overlapping.
In FIG. 4B, with the two filter members 1 and 2 overlaid as a boundary, the lower side of the paper is the upstream side of the exhaust flow G in the state where it is incorporated in the range hood, and the upper side of the paper is It is the exhaust downstream side of the exhaust flow G.
For example, as shown in FIG. 1, the filter A is installed in a suction port such as the capture space M of the deep range hood B so as to partition the exhaust upstream side and the exhaust downstream side of the exhaust flow G, Oils and fats, dust and the like in the exhaust stream G sucked and collected in the capture space M by the suction force of the device (not shown) are captured and recovered.
As shown in FIGS. 2 and 3, the filter A includes two filter members 1 and 2, and the two filter members 1 and 2 are formed as shown in FIG. , And are arranged by overlapping at a predetermined interval.

The two filter members 1 and 2 are each formed into a substantially rectangular shape having an appropriate size by punching, bending, drawing using a desired metal thin plate such as a galvanized steel plate, a corrosion-resistant aluminum plate, and a stainless steel plate. ing.
Moreover, the two filter members 1 and 2 are respectively provided with outer peripheral wall portions 3 and 4 that are continuously bent at a desired height (width) along each outer peripheral side.
Of the two filter members 1, 2, the second filter member 2 that is disposed on the exhaust downstream side is equivalent to the thickness of the outer peripheral wall 3 of the first filter member 1. The edge width dimension of each outer peripheral side is smaller than that of the filter member 1 of the eye.
As a result, the second filter member 2 is overlapped with the first filter member 1 at a predetermined interval by internal fitting. That is, the outer peripheral wall edge 4 of the second filter member 2 is formed with a height (width) corresponding to the interval when the two filter members 1 and 2 are overlaid.

  The exhaust flow G that is sucked and collected in the capture space M of the range hood B by the suction force of the blower is applied to the two filter members 1 and 2 that are overlaid at a predetermined interval. A number of vent holes 5, 6 are provided for passing through.

≪Composition explanation of the vents≫
The vent holes 5 and 6 are formed in an elongated hole shape having a predetermined opening width and opening length.
The opening width L1 of the vent holes 5 and 6 is preferably in the range of about 0.6 to 1.0 mm, and particularly preferably 0.8 mm. The opening length L2 is in the range of about 7 to 13 mm, particularly about 10 mm, and is formed in a very narrow (small) elongated hole shape (slit shape).

Then, as shown in the enlarged view of FIG. 2, the vent holes 5 and 6 have two substantially staggered arrangements in which the opening long edges are adjacent to each other and the opening length direction is directed in one direction. The filter members 1 and 2 are provided respectively.
Specifically, the short side edges on both sides in the opening length direction are positioned at the central portion of the length of the long opening edge of the adjacent vent holes 5 and 6, and the opening length direction is one direction. The vent holes 5 and 6 are respectively provided in the two filter members 1 and 2 in a substantially staggered arrangement.
As a result, as shown in FIGS. 2 and 3, the collective ventilation portions 7 and 8 for the exhaust flow G are partitioned and formed in the two filter members 1 and 2 by the aggregation of the respective vent holes 5 and 6. The non-venting portions 9 and 10 are formed (secured) adjacent to the collective ventilation portions 7 and 8, respectively.
Incidentally, the substantially staggered arrangement interval L3 of the vent holes 5 and 6 is set to about 1 mm between the long edges of the openings and between the short edges of the openings.

≪Explanation of collective ventilation part and non-ventilation part≫
The collective ventilation portions 7 and 8 are respectively formed into two filter members 1 and 2 by a set of vent holes 5 and 6 arranged in a substantially staggered manner, as shown in FIGS. 2 and 3. , Out of the outer sides of the two filter members 1 and 2, each of the opposing ones of the two sides 1 a, 1 b, 2 a, 2 b extends in a parallel strip shape and faces the other The two edges 1c, 1d, 2c, and 2d are disposed with a substantially equal width and an interval (non-venting portion).
Thereby, between the two ventilation edges 1c, 1d, 2c, and 2d between the two filter members 1 and 2, and between the collective ventilation portions 7 and 8, and on the two edges 1c, 1d, 2c, and 2d side, Non-venting portions 9, 10 that do not allow the exhaust flow G to pass through are arranged.
That is, as shown in FIG. 4B, the collective ventilation portions 7 and 8 and the non-ventilation portions 9 and 10 are arranged as shown in FIG. 4 (b) when the two filter members 1 and 2 are overlapped with a predetermined interval. Collective ventilation of the first ventilation member 7 on the filter member 1 side and the non-ventilation part 10 on the second filter member 2 side, and the non-ventilation part 9 of the first filter member 1 and the second filter member 2 It arrange | positions so that the part 8 may become the positional relationship which mutually opposes. The collective ventilation portions 7 and 8 and the non-venting portions 9 and 10 are alternately arranged with substantially equal widths between the two edges 1c, 1d, 2c, and 2d of the two filter members 1 and 2, respectively.

More specifically, for example, the width of each side of the outer periphery of each of the two filter members 1 and 2 is about 250 to 340 mm, and the collective ventilation portions 7 and 8 and the non-venting portions 9 and 10 are abbreviated. It is set as the strip | belt-shaped width | variety (parallel arrangement | positioning width | variety) extended in parallel of equal width. When the parallel strip-like width is set to about 20 to 23 mm, as shown in FIG. 2, on the first filter member 1 side, the collective ventilation portions 7 are arranged in four rows with substantially equal widths. A total of five rows of non-ventilating portions 9 are arranged between each of the collective ventilation portions 7 in three rows and two rows along the side edges 1c and 1d.
On the other hand, on the second filter member 2 side, the collective ventilation portions 8 are arranged in three rows corresponding to the three rows of non-venting portions 9 between the collective ventilation portions 7 on the first filter member 1 side. A total of four rows of non-ventilating portions 10 are arranged between the respective collective ventilation portions 8 in two rows along the two edges 2c and 2d.
As a result, when the two filter members 1 and 2 are overlaid, the collective ventilation portion 7 on the first filter member 1 side, the non-ventilation portion 10 on the second filter member 2 side, The non-venting portion 9 of the filter member 1 and the collective venting portion 8 of the second filter member 2 are in a positional relationship facing each other, and are arranged on the exhaust upstream side as shown in FIG. The exhaust flow G flowing in from each collective ventilation part 7 of the first filter member 1 collided with each non-venting part 10 facing the second filter member 2 arranged on the exhaust downstream side. The exhaust flow G is a flow of exhaust gas G, and the flow direction is changed to a substantially acute angle by the collision with each non-venting portion 10, from each collecting vent portion 8 arranged adjacent to each non-venting portion 10. The air is exhausted outside or circulated indoors (indoors).

The collective ventilation portion 8 on the second filter member 2 side can be disposed along the two edges 2c and 2d, respectively, as indicated by a two-dot chain line in FIG. In this case, among the three rows of collective ventilation portions 8, the two sides of the two sides of the collective ventilation portions 8 are secured so as to be secured between the two rows of the collective ventilation portions 8 located on the two side edges 2 c and 2 d side. A space is formed between the row and the group ventilation portion 8.
Thereby, ventilation resistance when exhaust flow G passes filter A can be eased.

And in this embodiment, about the filter A (test body) comprised by arranging the two filter members 1 and 2 formed in this way, it is also called an oil capture rate (an oil collection rate). In order to confirm the airflow resistance, a test was performed using each test piece having the following contents, and the test results are shown in Table 1 and FIG.
In this test, two filter members having a width dimension of 250 to 340 mm on each side of the outer periphery were used, and an opening size of 0.8 × 10 mm having an opening width L1 of 0.8 mm and an opening length L2 of 10 mm was used. A partition is formed by a set of test specimens (hereinafter referred to as “Comparative Example 1”) in which pores are arranged in a zigzag pattern with substantially the same width on the entire surface of the filter member, and a staggered arrangement of 0.8 × 10 mm vent holes. Specimens (hereinafter referred to as “Comparative Example 2”) in which the strip-like width (interleaved width) extending in parallel between the collective ventilation portion and the non-venting portion is set to 5 mm, and the belt-like width is set to 10 mm. Specimens (hereinafter referred to as “Comparative Example 3”), specimens set to 20 mm (hereinafter referred to as “Example 1”), 30 mm specimens (hereinafter referred to as “Example 2”), 40 Set specimen (hereinafter referred to as “Comparative Example 4”) The test was performed under the test conditions in which the exhaust air volume was set to 400 m 3 / h and the ventilation air speed was set to 1.5 and 3 m / s, respectively.

And the test order at this time shall be the following ae.
a. Heat the frying pan placed on the heating cooker in advance.
b. From the top of the frying pan, oil drops (about 10 seconds 12.5 g / 5 minutes) and water drops (about 10 seconds 30 drops 39.8 g / 5 minutes) are dropped.
c. Evaporate the evaporated oil and fat with a range hood.
d. When exhausting, oil is captured (collected) with a filter.
e. The test time is 1 hour, and this is repeated three times to obtain the average value.

And the oil capture rate (oil collection rate) can be calculated | required by measuring the adhesion amount of the fats and oils with respect to a filter, and the generation amount of fats and oils. This oil capture rate is obtained by the following equation.

Oil capture rate = (Amount of oil adhering to filter / Amount of oil generated) × 100 (%)

This oil capture rate is defined as “the value obtained by the above equation is 30% or more” in the evaluation standard when Better Living Foundation certifies as an excellent housing part.

As is clear from Table 1 and FIG. 5, in Comparative Example 1 (fully open), the airflow resistance is low, but the oil capture rate is about 44%. In Comparative Example 2 (5 mm) and Comparative Example 3 (10 mm), the airflow resistance is low, but the oil capture rate is about 65%. In the case of Comparative Example 4 (40 mm), the oil capture rate is 77%, but the ventilation resistance is as high as 76 Pa.
Therefore, the airflow resistance of the grease filter in a normal range hood is 50 Pa or less at 400 m ³ / h in view of the ability of a general blower, but the airflow resistance 76 Pa of Comparative Example 4 is too high. . Compared to this, in the case of Example 1 (20 mm) and Example 2 (30 mm), the oil capture rate was ensured to be 70% or more, and the ventilation resistance could be suppressed to 50 Pa or less.
As a result, the strip-like width (interleaved arrangement width) extending in parallel between the collective ventilation portion (partition formation by a set of staggered arrangement of 0.8 × 10 mm vent holes) and the non-ventilation portion is the same as in the first and second embodiments. A filter has been found to be suitable.

[Description of Other Embodiments]
FIG. 6 is a perspective view of a state in which two filter members constituting a filter according to another embodiment of the present invention are opposed to each other, and a cross-sectional view showing an enlarged part of the overlapped state.
In addition, the filter A-1 according to the other embodiment is disposed on the exhaust downstream side of the exhaust flow G as shown in FIG. 6 among the two filter members 1-1 and 2-1. The second ventilation member 8-1 of the second filter member 2-1 is formed by bulging toward the inner side where the two filter members 1-1 and 2-1 are overlaid. The filter member 1-1 is formed so as to face the non-venting part 9-1. Similarly, the first ventilation member 7-1 of the first filter member 1-1 is formed to bulge in the inner direction in which the first ventilation member 7-1 is overlaid, and the non-venting portion 10-1 of the second filter member 2-1. It is formed so as to face each other. The other constituent elements are basically the same as those in the above-described embodiment, and the same reference numerals are given to the same constituent elements, and redundant description is omitted.

That is, as shown in the enlarged cross-sectional view of FIG. 6B, each collective ventilation portion 8-1 of the second filter member 2-1 bulges toward the inside where the two filter members are overlaid. Thus, the adjacent non-venting portions 10-1 are respectively formed in a concave shape on the inner surface.
Similarly, each non-venting part 9-1 which adjoins each collective ventilation part 7-1 of the 1st filter member 1-1 by bulging toward the inner side which piled up two filter members. Are formed in a concave shape on the inner surface.

In this way, the non-venting portions 10-1 of the second filter member 2-1 colliding with the exhaust flow G flowing in from the collecting vent portions 7-1 of the first filter member 1-1 are connected to the inner surface. By making it concave, it is possible to increase the adhesion recovery rate (capture recovery rate) of dirt such as oil and fat in the exhaust flow G and dust due to the collision of the exhaust flow G to each non-venting part 10-1.
That is, the collision of the exhaust flow G with the inner concave non-venting portion 10-1 is repeated to the concave bottom surface and the concave rising surface, and adhesion and collection of dirt such as oil and fat and dust due to the collision of the exhaust flow G is performed. The rate (capture recovery rate) can be improved.

In addition, the collective ventilation portions 7-1 and 8-1 of the filter members 1-1 and 2-1 are bulged so as to act as a reinforcing portion between the adjacent non-venting portions 9-1 and 10-1. By adopting the configuration including the stepped portion (concave rising portion) formed, the rigidity of the filter members 1-1 and 2-1 made of a thin metal plate against bending deformation in the plate surface direction is increased.
This allows the user to clean using a cleaning tool such as a sponge without worrying that the filter members 1-1 and 2-1 are bent and damaged when cleaning in a sink or the like. Improvements in cleanability and handleability can be expected, which is beneficial.

FIG. 7 is a modified example of the filter according to another embodiment, and is a cross-sectional view showing a part thereof enlarged in a state in which two filter members are overlaid.
Further, in the filter A-1 according to another embodiment, as shown in FIG. 7, the bulging direction of the collective ventilation portions 7-1 and 8-1 of the two filter members 1-1 and 2-1 is set as follows. The direction is opposite to the bulging direction described in detail in the other embodiment. The filter A-1 according to this modification is basically the same as the other embodiments except for the change in the bulging direction of the collective ventilation portions 7-1 and 8-1. A duplicate description is omitted by giving the same reference numerals to the components.

  That is, as shown in FIG. 7, of the two filter members 1-1 and 2-1, the collective ventilation portion 8-1 of the second filter member 2-1 is connected to the two filter members 1-1. Each of the adjacent non-venting portions 10-1 is formed in a convex shape on the inner surface by bulging toward the outer side (exhaust downstream side of the exhaust flow G) where 1 and 2 are overlapped. And each collective ventilation part 7-1 of the first filter member 1-1 is directed to the outside (the exhaust upstream side of the exhaust flow G) where the two filter members 1-1 and 2-1 are overlaid. By bulging, each adjacent non-venting part 9-1 is formed into an inner surface convex shape, in other words, an outer surface concave shape.

As described above, the bulging direction of the collective ventilation portions 7-1 and 8-1 of the two filter members 1-1 and 2-1 is convex on the outer surface, and the adjacent non-venting portions 9-1 and 10- are adjacent to each other. By adopting a filter A-1 having a configuration in which 1 is convex on the inner surface, the first filter member 1-1 located on the upstream side of the exhaust gas is located downstream from each collective ventilation portion 7-1 of the filter member 1-1. When the exhaust flow G flows between the second filter member 2-1, as shown in FIG. 7, a part of the exhaust flow G collides with the outer surface non-venting portion 9-1 and flows there. The direction is greatly changed to the side of the collective ventilation section 7-1 repeatedly, and the adhesion collection rate (capture collection rate) of dirt such as oil and fat due to collision of the exhaust flow G with the non-venting section 9-1. Can be improved.
This is due to interference with the flow of the exhaust flow G that reaches the first filter member 1-1 and flows directly from the collecting vent 7-1 to the second filter member 2-1. It is the first filter member 1- 1 that a part of G repeatedly changes the flow direction to the collective ventilation part 7-1 side after colliding with changing the flow to the non-venting part 9-1 side. This is because it occurs on the outer surface of 1.

The specific configuration of the embodiment of the present invention is not limited to each of the above-described embodiments, and there are design changes and the like within a scope not departing from the gist of the present invention described in claims 1 to 6. However, it is included in the present invention.
For example, by changing the band width (alternately arranged width) of the collective ventilation portions 7, 7-1, 8, and 8-1 to the two filter members 1, 1-1, 2-1, 2-1 The number of columns can be set arbitrarily. The number of arrangement rows of the collective ventilation portions 7 and 7-1 to the first filter member 1 and 1-1 can be arbitrarily set within a range of 6 to 12 rows.

  Further, in the filter A-1 according to another embodiment, the collective ventilation portion 7-1 of the first filter member 1-1 is not flush with the non-venting portion 9-1 without being formed into a concave shape on the outer surface. It can be a flat surface.

  Moreover, the opening arrangement | sequence of the ventilation holes 5 and 6 in the assembly ventilation parts 7, 7-1, 8, and 8-1 can be made into a substantially grid | lattice-like arrangement | sequence.

Further, the two opposite edges 1a, 1b, 2a, 2b of the two filter members 1, 1-1, 2-1, 2-1 face each other toward the edges 1a, 2a and 1b, 2b. Dividing into substantially equal halves, the collecting vents 7, 7-1, 8, and 8-1 and the non-venting portions 9, 9-1, 10, and 10-1 are roughly arranged on the edges 1a and 2a and 1b and 2b. Arrangement forms in which they are alternately arranged with the same width can be adopted.
In this case, each of the collective ventilation portions 7, 7-1, 8, and 8-1 arranged on the side of the edges 1 a and 2 a is positioned on the belt-like extension reaching the 1 b and 2 b side, and is not on the 1 b and 2 b side. It can be set as the arrangement | positioning form by which ventilation part 9, 9-1, 10, 10-1 is arrange | positioned.

  In addition, the collective ventilation portions 7, 7-1, 8, and 8-1 and the non-venting portions 9, 9-1, 10, and 10-1 are combined into two filter members 1, 1-1, 2, and 2-1. It can be set as the arrangement | positioning form which is alternately arrange | positioned by the substantially equal width | variety like a grid pattern.

A, A-1 Filter 1, 1-1, 2-1, 2-1 Filter member 1a, 1b, 1c, 1d, 2a, 2b, 2c, 2d Edge 3, 4 Outer peripheral wall 5, 6, Vent 7, 7-1, 8, 8-1 Collecting ventilation part 9, 9-1, 10, 10-1 Non-venting part B Range hood G Exhaust flow

Claims (4)

A filter that is installed in the range hood and captures oil and fat in the exhaust stream generated during cooking.
A plurality of collective ventilation portions arranged and formed by a collection of a large number of vent holes through which the exhaust flow passes, and a plurality of non-venting portions arranged adjacent to the collective ventilation portions, respectively. A sheet of filter members,
The collective ventilation portion and the non-venting portion are alternately arranged on the two filter members in a positional relationship facing each other when the two filter members are overlaid,
Among the two filter members, the collective ventilation part on at least one filter member side is formed by bulging toward the inside or the outside where the two filter members are overlaid, whereby the collective ventilation part and A filter for a range hood, comprising a step portion between adjacent non-venting portions . The collective ventilation part and the non-ventilation part extend in parallel strips toward the opposite two edge directions of the outer peripheral sides of the two filter members having a substantially rectangular shape, and The range hood filter according to claim 1, wherein the filter is disposed alternately between the other two opposite edges . The vent hole defining and forming the collective ventilation portion has an opening width in a range of 0.6 to 1.0 mm and an opening length in a range of 7 to 13 mm, and has an elongated hole shape. The filter for range hoods according to claim 1 or 2. The range hood filter according to any one of claims 1 to 3, wherein the collective ventilation part and the non-ventilation part are alternately arranged with a substantially equal width in a range of 20 to 23 mm. .

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