Filter for vent port

Abstract

To provide a filter for a vent port capable of reliably preventing accumulation of dirt on a wall surface in the periphery of the vent port opening on the wall surface on an indoor side.SOLUTION: A filter for a vent port comprises a filter body 11 made of nonwoven fabric capable of capturing dust, and a tray 12 that houses the filter body 11. The tray 12 has a bottom plate 12a that covers a surface of the filter body 11 that faces the indoor wall surface, and a side plate 12b that covers a cut surface of the nonwoven fabric of the filter body 11. The bottom plate 12a has an opening 12d that corresponds to the vent port. When dust that has not been captured by the filter body attempts to diffuse from the cut surface and the surface facing the indoor wall surface, it collides with the side plate 12b and the bottom plate 12a of the tray 12 and most of it is captured by the side plate and bottom plate of the tray. After that, an airflow containing the dust flows along a wall surface of the tray, flows out of the filter body and tray in a vertical direction of the indoor wall surface around the vent port, and is diffused into the room.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a filter for a ventilation opening attached to a ventilation opening that opens on the indoor wall surface of a building.

Background Art

[0002] In recent years, houses have become more airtight, and if sufficient ventilation is not performed, the indoor carbon dioxide concentration may increase. In addition to the concentration of carbon dioxide, there are problems with volatile organic compounds (VOCs) contained in wall materials, etc. in newly built houses, and problems with mold that occur when the indoor humidity becomes too high. The need for ventilation is increasing.

[0003] Against this background, with the revision of the Building Standards Law in 2003, it has become obligatory to install ventilation system equipment so that outside air can be introduced into the room. Along with this, ventilation openings have been provided on the indoor side of buildings. As this type of ventilation opening, a ventilation register or the like whose opening can be closed with a lid so that rain does not enter the room during rainfall is known. A slide shaft is inserted through the ventilation opening, and a lid is fixed to the indoor end of this slide shaft, so that the lid can be opened and closed by advancing and retracting the slide shaft.

[0004] In such a ventilation opening with a lid, due to the lid, the wall surface around the ventilation opening may be soiled by dust or the like contained in the outside air. That is, the outside air that has passed through the main body side of the ventilation opening collides with the lid facing the indoor opening and diffuses radially around the lid. At this time, fine dust and dust (hereinafter, also simply referred to as "dust") diffuse together with the outside air, so this may adhere to the wall surface around the ventilation opening.

[0005] In order to prevent dust from entering the room and to prevent dust from adhering to the wall surface around the ventilation opening as described above, attempts have been made to insert a filter made of thick non-woven fabric between the main body and the lid of the ventilation opening, as in Patent Documents 1 and 2. Most of the dust and the like contained in the outside air are captured by this filter.

[0006] Also, as in Patent Document 3, attempts have been made to prevent dust and the like from adhering to the wall around the ventilation opening by pasting a wall protection sheet on the wall around the ventilation opening.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, in the case of the ventilation opening filter of Patent Documents 1 and 2, a part of the dust and the like contained in the outside air passes through without being captured by the filter and diffuses mainly from the cut surface of the filter and adheres to the wall surface in the vicinity thereof. Therefore, the dirt on the wall surface around the ventilation opening cannot be completely prevented.

[0009] Also, in the case of the wall protection sheet of Patent Document 3, a ventilation opening filter is separately required to prevent the inflow of dust into the room. In addition, the dirty wall protection sheet around the ventilation opening is completely visible, which is unsightly. Furthermore, when replacing the dirty wall protection sheet, there is a risk of damaging the wall surface, such as leaving glue on the wall surface or tearing the wallpaper on the wall surface.

[0010] Therefore, the problem to be solved by the present invention is to provide an air vent filter that can surely prevent dirt on the wall surface around the air vent opening to the indoor side wall surface without damaging the wall surface such as scratches.

Means for Solving the Problems

[0011] In order to solve the above problems, the air vent filter according to the invention includes a filter body made of a porous sheet capable of capturing dust contained in outside air flowing into the room through the air vent, a bottom plate covering the surface of the filter body facing the indoor wall surface, and a side plate rising from the periphery of the bottom plate and covering the cut surface of the porous sheet of the filter body. The bottom plate is provided with a tray having an opening corresponding to the air vent.

[0012] With this configuration, among the dust contained in the outside air, those that cannot be completely captured by the filter body made of the porous sheet will collide with the side plate of the tray when trying to diffuse from the cut surface of the filter body, and with the bottom plate of the tray when trying to diffuse from the surface facing the indoor wall surface, and most of them will be captured by the side plate and bottom plate of the tray. For this reason, after the airflow containing dust is further captured by the side plate and bottom plate of the tray, it flows along the wall surface of the tray and flows out from the filter body and the tray in the vertical direction of the indoor wall surface around the air vent (that is, the direction from the air vent to the center of the room) and diffuses into the room. Therefore, it is surely prevented that the periphery of the air vent is soiled by dust.

[0013] In addition, since the air vent filter is not attached around the air vent using an adhesive or the like as in Patent Document 3, it looks good and does not damage the wall surface around the air vent. The portion of the bottom plate of the tray corresponding to the air vent is open, and outside air flows through this opening, so the original ventilation function is not hindered. Note that the porous sheet refers to a sheet body having a porous structure such as a non-woven fabric or a foamed resin with continuous bubbles (for example, an open-cell sponge made of urethane foam), which has air permeability and can capture dust.

[0014] In the filter for the vent hole according to the invention, when the vent hole has a slide shaft penetrating it indoors and outdoors, and a lid connected to the indoor side end of the slide shaft and capable of opening and closing the opening of the vent hole as the slide shaft advances and retreats, the filter body has an insertion portion through which the slide shaft can be inserted and a slit communicating from the insertion portion to the cut surface. The tray has a slit communicating from the opening through the peripheral edge of the side panel to the outer edge of the side panel at a position overlapping the slit, and it is preferable to adopt a configuration that allows insertion from the side of the slide shaft through the slit of the filter body and the slit of the tray. Note that it is more preferable that the insertion portion is a shaft hole formed in a hole shape so that the slide shaft can be smoothly inserted.

[0015] With this configuration, it becomes possible to fit the filter for the vent hole from the side of the slide shaft through the slit and fix it to the vent hole without removing the lid of the vent hole, so the attachability is improved. In addition, it is not necessary to separately prepare a fixture or the like from the filter for the vent hole, and the convenience is improved.

[0016] In the filter for the vent hole according to the invention, it is preferable to adopt a configuration in which the angle formed by the bottom panel and the side panel of the tray is 87° or more and 140° or less, and more preferably 90° or more and 135° or less.

[0017] With this configuration, the rising angle of the side panel from the bottom panel in the tray can be made to fully exhibit the function of preventing dust from adhering to the wall surface without impairing the air permeability. If the angle is 90° or less, the side panel rises inward and gets too close to the lid, and may in some cases contact the lid, and in any case, there is a risk of impairing the ventilation function of the vent hole. When the angle is 135° or more, the side plate lies outward, and the airflow containing dust along the side plate advances toward the indoor wall surface, and there is a possibility that the effect of suppressing adhesion to the wall surface cannot be sufficiently exerted.

[0018] In the vent filter according to the invention, a configuration in which ribs are formed on the bottom plate of the tray can be adopted.

[0019] With this configuration, since the strength of the tray is improved, its breakage is suppressed. Since the thickness of the tray can be reduced, under the constraint that the total thickness of the vent filter is required to be a certain value or less, the thickness of the filter body can be increased, so that the dust collection performance can be enhanced.

[0020] In the vent filter according to the invention, it is preferable to adopt a configuration in which the tray is formed by bending the side plates from a blank composed of a bottom plate and side plates continuously provided at the periphery of the bottom plate.

[0021] The tray can be formed as an integrally molded product, but by making it foldable from a blank, it can be easily manufactured at low cost. The fixing mode between adjacent side plates is not particularly limited, and a substitute may be interposed between them.

[0022] In the vent filter according to the invention, it is preferable to adopt a configuration in which the tray is made of paper or resin.

[0023] With this configuration, the tray can be made low-cost and lightweight. When the tray is made of metal or the like, the cost is high and the weight is large, so the attachment state to the vent filter cannot be maintained and there is a risk of dropping or the like. However, in the present invention, those in which the tray is made of metal or the like are not excluded. Since the tray is only subject to an impact where the airflow contacts it, even if it is made of paper or the like, it has sufficient strength. By making it resin-made, its water resistance is enhanced, and it can be prevented from getting soiled even when the outside air contains moisture such as rainwater, or when dew forms at the ventilation opening due to the air temperature. In the case of paper-made ones as well, coated cardboard or paper with water-repellent processing is particularly preferable as those with high water resistance.

[0024] In the filter for the ventilation opening according to the invention, it is preferable to adopt a configuration in which the thickness of the filter body is 10 mm or more and 30 mm or more, and the height of the side plate of the tray is 18 mm or more and 40 mm. It is more preferable to adopt a configuration in which the thickness of the filter body is 15 mm or more and 25 mm or less, and the height of the side plate of the tray is 20 mm or more.

[0025] With such a configuration, it is possible to achieve both a high level of attachability of the filter for the ventilation opening and a dirt-preventing effect. If the thickness of the filter body is less than 10 mm, it is too thin and difficult to be fixed between the ventilation opening body and the lid, and there is a risk of falling due to wind from the outside or the like. If the thickness of the filter body exceeds 30 mm, it is too thick and may exceed the interval between the ventilation opening body and the lid, and there is a risk that it cannot be inserted in between. If the height of the side plate of the tray is less than 18 mm, the height is insufficient to adjust the direction of the airflow containing dust, and there is a risk that the dirt-preventing effect cannot be fully exerted, for example, the airflow may directly head towards the indoor wall surface. If the height of the side plate of the tray exceeds 40 mm, there is a risk that the tray will protrude too much when attached, resulting in poor design, or that an object may get caught on the tray protruding from the wall surface, causing damage to the ventilation opening or the caught object.

[0026] In the vent filter according to the invention, the dimensions of the filter body when not compressed (i.e., before the filter body is installed) are larger than the space defined by the bottom plate and the side plates of the tray, and the filter body can adopt a configuration in which the cut surface of the porous sheet adjacent to the side plate of the tray is compressed and housed in the space.

[0027] With such a configuration, the cut surface of the filter body and the side plate of the tray will surely contact without a gap, and the pores of the porous sheet on the cut surface of the filter body will be clogged. Therefore, it becomes difficult for the air containing dust to flow out from here, and it is further prevented that the wall surface around the vent is soiled.

[0028] Alternatively, in order to solve the above problems, the vent filter according to the invention comprises a filter body made of a porous sheet capable of capturing dust contained in the outside air flowing into the room through the vent, a surface facing the indoor wall surface of the filter body, and a plugging portion that inhibits the air permeability of the porous sheet of the filter body on the cut surface of the filter body.

[0029] With such a configuration, the plugging portion has the same effect as the wall surface of the tray. That is, among the dust contained in the outside air, those that cannot be captured by the filter body made of the porous sheet collide with the plugging portion when they try to diffuse from the cut surface of the filter body or the surface facing the indoor wall surface, and most of them are captured by the plugging portion. For this reason, after more dust is captured at the plugging portion, the airflow containing dust flows along the plugging portion, flows out from the filter body in the vertical direction of the indoor wall surface around the vent (i.e., the direction from the vent toward the center of the room), and diffuses into the room. Therefore, it is surely prevented that the periphery of the vent is soiled by dust. Since a tray separate from the filter body is not required, the manufacturing cost can be reduced.

[0030] In the vent filter according to the invention, the blocking part is a blocking tape attached to the opposing surface with the wall surface of the filter body and the cut surface of the porous sheet of the filter body, or a configuration in which the opposing surface with the wall surface of the filter body and the cut surface of the porous sheet of the filter body are blocked. As the blocking process, for example, a configuration in which the opposing surface with the wall surface of the filter body and the cut surface of the porous sheet of the filter body are melted and blocked to form a fused part, or a configuration in which the cut surface of the porous sheet of the filter body is impregnated and solidified with a blocking material can be adopted.

[0031] With such a configuration, the blocking part can be formed simply and at low cost.

[0032] In the vent filter according to the invention, the basis weight of the filter body is preferably 200 g / m 2 or more and 400 g / m 2 or less.

[0033] With such a configuration, the filter body can have good dust collection efficiency without inhibiting the ventilation function of the vent. If the basis weight of the filter body is less than 200 g / m 2 , the basis weight may be insufficient and the dust collection efficiency may decrease. If it is 400 g / m 2 or more, the basis weight may be excessive, the air permeability may decrease, and the ventilation function may not be fulfilled.

Effect of the Invention

[0034] By configuring the vent filter according to the invention as described above, it is possible to reliably prevent the dirt of the wall surface around the vent without damaging the wall surface.

Brief Description of the Drawings

[0035]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0036] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0037] As shown in FIGS. 1 to 6, the vent filter 10 of the embodiment is attached to a vent V that opens in the indoor wall surface, and is used to collect dust mixed in the outside air that attempts to flow into the room through the vent V. The vent filter 10 is composed of a filter body 11 and a tray 12, and is configured so that dust does not adhere to the indoor wall surface around the vent V.

[0038] As shown in FIGS. 4 and 6, the vent filter 10 is attached to a vent V with a lid, that is, a vent body M, through which a slide shaft S is inserted, and a lid L is fixed to the indoor-side end of the slide shaft S, so that the lid L can be opened and closed by advancing and retracting the slide shaft. It is preferably attached to the vent V configured in this way. The shape of the vent V is not particularly limited. In the illustration, both the vent body M and the lid L are circular in plan view.

[0039] As shown in FIG. 2, the filter body 11 is a thick sheet made of a porous material with air permeability. The type of the porous material is not particularly limited as long as it can collect dust, and it may be a foam with continuous bubbles, etc. In the embodiment, it is made of a thick non-woven fabric. By using a non-woven fabric, the dust collection performance can be made excellent.

[0040] When the filter body 11 is made of non-woven fabric, the type of its fibers is not particularly limited, but examples thereof include polypropylene fibers, polyethylene fibers, nylon fibers, polyethylene terephthalate fibers, and mixed fibers thereof. If polyethylene terephthalate fibers are used, it is preferable because of excellent heat resistance, cold resistance, etc. Further, cut auxiliary lines such as perforations and half cuts may be separately provided on the filter body 11 in advance so that it can be easily cut according to the size and shape of the ventilation port.

[0041] When the filter body 11 is made of non-woven fabric, its manufacturing method is not particularly limited, and examples thereof include the spunbond method, the meltblown method, the thermal bonding method, and the needle punch method. As a flexible one with excellent dust collection performance, it is preferably by the thermal bonding method.

[0042] The shape of the filter body 11 is not particularly limited as long as it can cover the ventilation port V, and it may be circular, rectangular, polygonal, etc. in plan view. In the embodiment, it is square. By doing so, when cutting the filter body 11 from the rectangular non-woven fabric sheet as the raw material, unlike the case of a circle, no scraps are generated and there is less waste. Further, by previously providing cut auxiliary lines according to the sizes and shapes of various ventilation ports, the applicable range of the ventilation port filter can be widened. The filter body 11 has a front surface, a back surface, and side surfaces. The back surface is the surface facing the indoor wall surface, and the side surfaces are the cut surfaces formed by cutting the non-woven fabric sheet.

[0043] The vertical and horizontal dimensions of the filter body 11 are not particularly limited. In the case of a square, it is preferably 120 mm to 200 mm both vertically and horizontally. By setting it within this range, ventilation ports V with general dimensions can be covered without excess or deficiency. If the dimension is less than 120 mm, there is a risk that part of the vent V may not be covered. If the dimension exceeds 200 mm, it is too large and the outer edge part hardly functions as a filter, which may be wasted. Also, since the exposed area from the end of the vent increases, it may not be preferable in terms of design. The relative dimensional relationship between the filter body 11 and the lid L of the vent V is not particularly limited. However, when the vertical and horizontal dimensions of the filter body 11 are W1 and the diameter of the lid L is D, it is preferably 0.6 ≦ D / W1 ≦ 1.0. When D / W1 < 0.6, since the dimension of the lid becomes smaller than that of the filter body, the function of locking the tray to the vent and the filter body may be impaired. When D / W1 > 1.0, since the dimension of the filter body becomes smaller than that of the lid, a part where the back side of the lid is not covered by the filter body is generated, and there is a risk that dust adheres to that part and the lid becomes easily soiled.

[0044] The thickness of the filter body 11 is not particularly limited, but it can be exemplified as being 10 mm or more and 30 mm or less, and preferably 15 mm or more and 25 mm or less. By setting the thickness within this range, it is possible to achieve both the strength of the filter body 11 and the dust collection performance and the attachability to the vent. If the thickness is less than 10 mm, there is a risk of insufficient strength resulting in breakage or the like, or insufficient dust collection performance. If the thickness exceeds 30 mm, it may be difficult to insert between the main body and the lid of the vent due to the excessive thickness.

[0045] The basis weight of the filter body 11 is not particularly limited, but it is preferably configured to be 200 g / m 2 or more and 400 g / m 2 or less. By setting the basis weight within this range, the filter body 11 can have good dust collection efficiency without inhibiting the ventilation function of the vent. When the basis weight is 200 g / m 2If it is less than this value, the basis weight may be insufficient and the dust collection efficiency may decrease. If the basis weight is 400 g / m 2 or more, the basis weight may be excessive, the air permeability may decrease, and the ventilation function may not be fulfilled.

[0046] The filter body 11 has a circular shaft hole 11a as an insertion part at its center. The diameter of the shaft hole 11a is substantially the same as or slightly larger than the diameter of the slide shaft S of the ventilation port. Note that the insertion part does not have to be a circular hole. As long as the slide shaft S can be inserted, the end of the filter body 11 on the center point side of the slit 11b described later may be used as the insertion part as it is, or it may be a cross-shaped or X-shaped cut. In addition, the filter body 11 has a slit 11b extending from the shaft hole 11a toward the outer edge. The position of the slit 11b is not particularly limited. In the embodiment, the length of the slit 11b is set to be the shortest, and it is on a line that coincides with the perpendicular line dropped toward the midpoint of one of the four sides. Note that the slit 11b may not be provided, but it is preferable to have the slit 11b because the attachability to the ventilation port is improved as described later. As shown in FIGS. 4 and 5, by inserting the filter body 11 from the side into the shaft hole 11a through the slit 11b so that the slide shaft S fits into the slide shaft S of the ventilation port with a lid, the attachability is improved. In the case of the embodiment, since the length of the slit 11b is the shortest, the insertion distance is short and the attachability is further improved. From the above-described dimensional relationship, almost no gap is generated between the shaft hole 11a and the slide shaft S.

[0047] As shown in FIG. 2, the tray 12 is composed of a bottom plate 12a and side plates 12b rising from the bottom plate 12a, and the bottom plate 12a is open. The filter body 11 is housed in the tray 12. In the state of being housed in the tray 12, the back surface (the surface facing the wall surface) of the filter body 11 faces the bottom plate 12a, and the side surface (the cut surface) of the filter body 11 faces the side plates 12b. The shape of the tray 12 is not particularly limited as long as it can accommodate the filter body 11, and it may be circular, rectangular, polygonal, etc. in plan view. However, in the embodiment, it is square in plan view (the bottom plate is square) so that the filter body 11 can fit in without excess or deficiency. Ribs can also be provided on the bottom plate 12a of the tray 12 for reinforcement.

[0048] Due to the presence of the tray 12, when dust contained in the outside air that could not be completely captured by the filter body 11 attempts to diffuse from its side surface (cut surface), it collides with the side plate 12b, and when it attempts to diffuse from its back surface (the surface facing the wall surface), it collides with the bottom plate 12a, and most of it is captured by the side plate 12b and the bottom plate 12a of the tray. For this reason, the airflow containing dust flows along the wall surface of the tray 12 and diffuses from the tray 12 into the room at a position away from the periphery of the ventilation opening. Therefore, the periphery of the ventilation opening is not soiled by dust.

[0049] The material of the tray 12 is not particularly limited, and examples include metal, wood, resin, and paper. However, as materials that are lightweight and can be manufactured at low cost, resin and paper are preferred. In the case of resin, since it has high water resistance, it can be prevented from being soiled or damaged even when the outside air contains moisture such as rainwater, or when dew condensation occurs at the ventilation opening due to the air temperature. In the case of paper, as those with high water resistance, coated cardboard and paper with water-repellent treatment are particularly preferred.

[0050] The dimensions of the tray 12 are not particularly limited as long as the filter body 11 can be accommodated. For the bottom plate 12a, it can be exemplified that both the length and width are from 120 mm to 200 mm. Also, for the side plate 12b, it can be exemplified that the height (width) is 18 mm or more and 40 mm or less, and preferably 20 mm or more. If the height of the side plate of the tray is less than 18 mm, the height is insufficient to adjust the direction of the airflow containing dust, and the airflow may directly go towards the wall surface of the room, etc., and there is a possibility that the dirt prevention effect cannot be fully exerted. If the height of the side panel 12b of the tray 12 exceeds 40 mm, when it is attached, the tray 12 may protrude too much, resulting in poor design, or objects may get caught on the tray protruding from the wall surface, causing damage to the ventilation opening or the caught objects. The relative dimensional relationship between the tray 12 and the lid L of the ventilation opening V is not particularly limited. However, when the longitudinal and lateral dimensions of the tray 12 are W2 and the diameter of the lid L is D, it is preferably 0.6 ≦ D / W2 ≦ 0.95.

[0051] Regarding the relative dimensional relationship between the tray 12 and the filter body 11, as shown in FIG. 1, as long as the filter body 11 can be accommodated in the tray 12, it is not particularly limited. Of course, the longitudinal and lateral dimensions of the tray 12 may be larger than those of the filter body 11, or even if the longitudinal and lateral dimensions of the tray 12 are smaller than those of the filter body 11, it is sufficient that the filter body 11 can be compressed longitudinally and laterally and accommodated in the tray 12. If the filter body 11 is accommodated in the tray 12 in a state where its side surface (cut surface) is compressed in the longitudinal and lateral directions, the cut surface of the filter body and the side panel of the tray will surely contact without a gap, and the pores of the cut surface will be clogged. As a result, it becomes difficult for the air containing dust to flow out from here, and the wall surface around the ventilation opening is less likely to get dirty.

[0052] The relationship between the height of the side panel 12b of the tray 12 and the thickness of the filter body 11 is not particularly limited, but it is preferably that the height of the side panel 12b of the tray 12 is the same as or greater than the thickness of the filter body 11. By doing so, almost the entire area of the side surface (cut surface) of the filter body 11 can be covered by the side panel 12b, so that the adhesion of dust to the indoor wall surface can be more effectively suppressed.

[0053] The angle α formed by the bottom panel 12a and the side panel 12b of the tray 12 shown in FIG. 6 is not particularly limited, but it is preferably 87° or more and 140° or less. With such a configuration, the rising angle of the side panel from the bottom panel can be made to sufficiently exhibit the function of preventing dust from adhering to the wall surface without impairing the air permeability. If the angle α is 90° or less, the side panel 12b rises inward, which may impair the ventilation function of the ventilation port. If the angle α is 135° or more, the side panel 12b is in a state of lying outward, so the airflow containing dust along the side panel 12b may directly proceed to the indoor wall surface, and there is a possibility that the adhesion of dust to the wall surface cannot be sufficiently suppressed.

[0054] The tray 12 can also be integrally formed by a mold or the like. However, in the embodiment, it is preferably manufactured by bending a blank composed of a bottom panel 12a, side panels 12b continuously provided at the periphery (four sides) thereof, and a successor 12c continuously provided at the side of the side panel 12b as shown in FIG. 3. Specifically, the side panel 12b is bent almost at a right angle with respect to the bottom panel 12a and raised, and the successor 12c is bent almost at a right angle with respect to the side panel 12b and is arranged along the inner surface of the adjacent side panel 12b, and is connected by appropriate means such as adhesion. By bending the blank, the tray 12 can be manufactured simply and at low cost.

[0055] As shown in FIG. 2, an opening 12d is provided at the center of the bottom panel 12a of the tray 12. The opening 12d is circular, and its diameter is substantially equal to the diameter of the ventilation port body. Due to the presence of the opening 12d, the inflow of outside air into the room through the ventilation port is not blocked by the tray 12. When the filter body 11 is housed in the tray 12, the opening 12d is concentrically located with the shaft hole 11a.

[0056] In addition, the tray 12 is provided with a slit 12e extending from the opening 12d of the bottom panel 12a. The position of the slit 12e is not particularly limited as long as at least a part of it coincides with the slit 11b of the filter body 11 when the filter body 11 is accommodated in the tray 12. In the embodiment, it extends vertically above and below the opening 12d, and the lower slit 12e coincides with the slit 11b. The lower slit 12e communicates from the opening 12d of the bottom plate 12a through the boundary between the bottom plate 12a and the side plate 12b and further across the side plate 12b to its outer edge. Also, the upper slit 12e terminates at the boundary between the bottom plate 12a and the side plate 12b from the opening of the bottom plate 12a. Due to the slit 12e, as shown in FIG. 5, the tray 12 can be opened and closed left and right. Note that the slit 12e may not be provided, but it is preferable to have the slit 12e because the attachment property to the vent improves with the presence of the slit 12e as described later. Also, even when having the slit 12e, only the lower slit 12e may be provided.

[0057] The configuration of the vent filter 10 of the embodiment is as described above. Next, an example of its attachment method will be described. With respect to the vent body M with the lid open, bring the vent filter 10 in a state where the filter body 11 is accommodated in the tray 12 closer to it from the side, and align the slit 11b of the filter body 11 and the lower slit 12e of the tray 12 with the slide shaft S. With respect to the indoor wall surface, the bottom plate 12a of the tray 12 is in an opposing state. While keeping it as it is, bring the vent filter 10 closer to the slide shaft S and insert the slit 11b of the filter body 11 into the slide shaft S as shown in FIG. 4. At this time, the tray 12 in contact with the slide shaft S opens at the slit 12e as shown in the exploded perspective view of the vent filter with the slit opened in FIG. 5. As shown in FIG. 6, insert the slide shaft S into the inner part of the slit 11b and fit it into the shaft hole 11a. At this time, since the slide shaft S is located within the opening 12d of the tray 12, the slit 12e closes. Thus, the attachment is completed.

[0058] FIG. 7 shows another example of the vent filter 10 of the embodiment. In this example, the vent filter 10 does not include the tray 12. Instead, the back surface (the surface facing the wall surface) and the side surface (the cut surface of the sheet) of the filter body 11 have the blocking portions 13. The blocking portions 13 are subjected to a process that inhibits the air permeability of the filter body 11. Specifically, but not limited thereto, as shown in FIG. 7(b), a blocking tape is attached to the surface, or the surface is melted and blocked to form a fused portion, or a configuration in which a blocking material is impregnated and solidified on the cut surface of the porous sheet of the filter body can be exemplified as a simple and low-cost mode of forming the blocking portion 13.

[0059] Also in this case, when dust contained in the outside air that cannot be completely captured by the filter body 11 attempts to diffuse from its side surface (cut surface) or its back surface (the surface facing the wall surface), it collides with the blocking portions 13 respectively. For this reason, after the airflow containing dust is further captured by the blocking portion, it flows along the blocking portion 13, flows out from the filter body in the vertical direction of the indoor wall surface around the vent (that is, the direction from the vent toward the center of the room), and diffuses from the tray 12 into the room. Therefore, the periphery of the vent is not soiled by dust. Since the blocking portion 13 has the opening 13a, the flow of the outside air is not obstructed. Since the separate tray 12 from the filter body 11 is not required, the manufacturing cost can be reduced.

Example

[0060] Hereinafter, the content of the present invention will be further clarified by giving examples of the present invention.

[0061] As Examples 1 to 3, having the shape shown in FIGS. 1 to 6, polyester fibers of 160 mm × 160 mm × apparent thickness 20 mm with a basis weight of 250 g / m 2A filter for an air vent composed of a thermal bond nonwoven filter body and a tray of 160 mm × 160 mm × 20 mm was fabricated. Here, the center of the bottom plate of the tray had an opening of φ100 mm, and the slits were linearly formed such that one end reached the boundary between the bottom plate and the side plate and the other end reached the outer edge of the side plate.

[0062] In Example 1, the material of the tray was coated cardboard paper of 450 g / m 2 and was fabricated by punching a coated cardboard flat plate into a predetermined shape and then performing bending processing.

[0063] In Example 2, the material of the tray was made of vinyl chloride resin with a thickness of 0.25 mm, and was fabricated by vacuum forming a vinyl chloride sheet and then punching it into a predetermined shape. A total of four ribs with a length of 20 mm × width of 10 mm were provided between the opening of the tray and each corner of the tray.

[0064] In Example 3, the material of the tray was made of polyethylene terephthalate (PET) with a thickness of 0.3 mm, and was fabricated by punching a PET flat plate into a predetermined shape and then performing bending processing.

[0065] When the air vent filters of Example 1 and Example 3 were attached to the air vent V, the dust and dirt collection performance was confirmed, and it was also confirmed that the indoor wall surface around the air vent was not easily soiled by dust.

[0066] The embodiments and examples disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims, and includes all modifications and changes within the scope and equivalent meanings thereof.

Explanation of Signs

[0067] 10 Air vent filter 11 Filter body 11a Shaft hole 11b Slit 12 Tray 12a Bottom panel 12b Side panel 12c Subculture 12d Opening 12e Slit 13 Sealing part 13a Opening V Vent M Vent body L Lid S Slide shaft

Claims

1. A filter attached to a ventilation opening that opens to an interior wall surface, comprising a filter body made of a porous sheet capable of capturing dust contained in outside air flowing into the interior through the ventilation opening, a bottom plate covering the surface of the filter body facing the wall surface, and a side plate rising from the periphery of the bottom plate and covering the cut surface of the porous sheet of the filter body, and the bottom plate is provided with a tray having an opening corresponding to the ventilation opening. A filter for a ventilation opening.

2. The ventilation opening has a slide shaft that penetrates the interior and exterior, and a lid connected to the interior side end of the slide shaft and capable of opening and closing the opening of the ventilation opening as the slide shaft advances and retreats, The filter body has an insertion portion through which the slide shaft can be inserted, and a slit communicating from the insertion portion to the cut surface, The tray has a slit at a position overlapping the slit, the slit communicating from the opening through the periphery of the side plate to the outer edge of the side plate, The filter for a ventilation opening according to claim 1, which can be inserted from the side of the slide shaft through the slit of the filter body and the slit of the tray.

3. The filter for a ventilation opening according to claim 1 or 2, wherein the angle formed by the bottom plate and the side plate of the tray is 87° or more and 140° or less.

4. The filter for a ventilation opening according to claim 1 or 2, wherein ribs are formed on the bottom plate of the tray.

5. The filter for a ventilation opening according to claim 1 or 2, wherein the tray is formed by bending the side plate from a blank composed of a bottom plate and a side plate continuously provided at the periphery of the bottom plate.

6. The filter for a ventilation opening according to claim 1 or 2, wherein the tray is made of paper or resin.

7. The thickness of the filter body is 15 mm or more and 25 mm or less, The height of the side plate of the tray is 18 mm or more and 40 mm or less. The filter for a ventilation opening according to claim 1 or 2.

8. The dimensions of the filter body when not compressed are larger than the space defined by the bottom plate and the side plate of the tray, The filter body is housed in the space in a state where the cut surface of the porous sheet adjacent to the side plate of the tray is compressed. The filter for a ventilation opening according to claim 1 or 2.

9. A filter attached to a ventilation opening that opens to an interior wall surface, A filter body made of a porous sheet capable of capturing dust contained in outside air flowing into a room through the ventilation opening, A filter for a ventilation opening, comprising a surface facing the wall surface of the filter body and a blocking portion that inhibits the air permeability of the porous sheet of the filter body at a cut surface of the porous sheet of the filter body.

10. The filter for a ventilation opening according to claim 9, wherein the blocking portion is a blocking tape attached to a surface facing the wall surface of the filter body and a cut surface of the porous sheet of the filter body.

11. The filter for a ventilation opening according to claim 9, wherein the blocking portion is obtained by performing a blocking process on a surface facing the wall surface of the filter body and a cut surface of the porous sheet of the filter body.

12. The basis weight of the filter body is 200 g / m ２ or more and 400 g / m ２ or less. The air vent filter according to any one of claims 1, 2, and 9 to 11.

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