JP2017026176A - Ventilation port cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance ventilation performance while providing a structure inside a ventilation port cover for exhausting indoor air to the outdoors.SOLUTION: A ventilation port cover 11 comprises: an insertion cylinder 12 which is inserted into and connected to an outdoor side terminal of a ventilation hole H opening in an outer wall W of a building; and a hood 13 for covering the front of the insertion cylinder 12, wherein an airflow control plate 15 is disposed in the hood 13. In the airflow control plate 15, a ventilation window 15b which serves as a vent hole is provided at a rectification wall 15a which expands toward an opening 12a side of the insertion cylinder 12 from a louver 16 side provided at a hood front surface 13a. Thereby, the ventilation port cover 11 excels in ventilation properties without increasing pressure loss. Also, outdoor noise is made hardly transmitted to the indoors using a sound absorption material in the airflow control plate 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vent cover that is attached to a vent of a building.

  The vent cover, which is installed on the outer wall of the building and prevents the entry of wind and rain into the vent, has a plug that can be inserted into the outdoor terminal of the vent and a hood that covers the front (outdoor) of the plug The indoor air is discharged outside the building through the plug and the hood. For example, Japanese Patent Laying-Open No. 2014-66404 (Patent Document 1) discloses a vent cover that is one conventional example.

JP 2014-66404 A

  As in the vent cover of Patent Document 1, the vent cover often has a structure in which the interior of the hood is a cavity and the air flow is not obstructed so that indoor air can be smoothly discharged outdoors. And because of such restrictions on ventilation performance, it is difficult to take noise countermeasures inside the vent cover to prevent outdoor noise and raindrops from reaching the room from the vent cover. Even if it removes, for example, the sound absorbing material is pasted on the inner surface of the hood.

  The present invention has been made against the background of the conventional vent cover as described above. The purpose is to provide a vent cover that does not impair pressure loss performance even if a member is provided inside the hood.

  In order to achieve the above object, the present invention is configured as follows.

That is, the present invention relates to an airflow control in a hood in a ventilation port cover including an insertion tube that is inserted and connected to an outdoor side terminal of a ventilation port that opens in an outer wall of a building, and a hood that covers the front of the insertion tube. The airflow control plate includes a rectifying wall that widens from the opening side provided in the front of the hood toward the opening side of the insertion tube, and a ventilation window that serves as a vent provided in the rectifying wall. It is characterized by having.
The airflow control plate of the present invention forms a rectifying wall that expands from the opening side provided in the front of the hood toward the opening side of the insertion tube in the hood. Taking this in the direction of airflow, the airflow control plate forms a rectifying wall that narrows the airflow path from the opening side of the plug-in tube toward the opening, and opens from the ventilation window that becomes the ventilation hole. Blow out toward the club. In the ventilation port cover of the present invention, such airflow control is performed inside the hood, so that the pressure loss performance can be improved as compared with the case where nothing is provided inside the hood and it is a cavity.

Such an airflow control plate can form a rectifying wall that expands in a V shape from the opening side provided in the front of the hood toward the opening side of the insertion tube.
Since the rectifying wall expands in a V shape from the opening side provided in the front of the hood toward the opening side of the insertion tube, the flow of air blown into the hood from the room is ventilated by the V-shaped rectifying wall. The pressure loss coefficient can be lowered by guiding it to the window.

  The ventilation window can penetrate the central portion of the airflow control plate. Since the ventilation window passes through the central portion of the airflow control plate, the airflow blown into the hood from the insertion tube can be collected on the central portion of the airflow control plate by the rectifying wall, and the flow pressure loss performance can be improved.

  The ventilation window can also form the flow straightening wall in an inverted U shape by dividing the bottom of the airflow control plate. Since the ventilation window is divided into the bottom of the airflow control plate and the rectifying wall is formed in an inverted U shape, an air passage that can effectively exhaust air to the opening provided on the lower side of the front of the hood is secured. be able to.

The outer shape of the ventilation window can be substantially octagonal. Because the outer shape of the ventilation window is almost octagonal,
The pressure loss coefficient can be made smaller than simply circular. Therefore, it can be set as the ventilation port cover excellent in ventilation performance.

About an airflow control board, the upper part, the side part, and the bottom part may contact | connect the upper surface, side surface, and bottom face of a food | hood, and a ventilation window can be provided below the center of an airflow control board.
Since the upper part, the side part, and the bottom part of the airflow control plate are in contact with the top surface, the side surface, and the bottom surface of the hood, the airflow flowing from the opening of the insertion tube can be prevented from wrapping around the rectifying wall. In addition, since the ventilation window is provided below the center of the airflow control plate, the airflow that flows in from the opening of the insertion tube flows into the ventilation window that opens below the center, and is located below the front of the hood. The airflow tends to face the part. For these reasons, it is possible to provide a ventilation port cover that is more excellent in pressure loss performance than a hollow inside the hood.

  The opening can be a louver provided below the front of the hood. Since the opening is provided so as to open the lower side of the front of the hood, the airflow flowing from the opening of the insertion tube through the ventilation window can be discharged toward the lower side of the building. Moreover, it is excellent also in a design by making an opening part into glares, and the external appearance of a building is not impaired.

The rectifying wall can also be configured by laminating a space supplement material on a metal or resin plate serving as a base.
Space replenishment material fills a space with a certain volume, such as porous plastic or fibrous material that is not heavy like metal or resin plate but lighter per unit volume, such as metal It has a better absorption effect than a member that reflects sound such as a resin plate. The rectifying wall is made by laminating a space supplementary material with a high sound absorption effect on the base metal or resin plate, so the effect of absorbing noise from the outside of the building is enhanced, and a ventilation port cover with a soundproofing effect is provided. can do. Further, the space replenishment material can be easily removed, and cleaning and replacement can be easily performed. If there is a material with excellent sound absorbing performance, it can be easily replaced with such a material to provide a vent cover with better sound absorbing performance.

The entire rectifying wall can be formed of a sheet-like space supplement material.
Since the rectifying wall is formed of a sheet-like space supplementary material, in other words, the rectifying wall itself is formed of a material that has a sound absorbing effect rather than a metal or a resin plate, it is possible to simultaneously control airflow and sound absorption. Further, it is possible to omit a metal or a resin plate serving as a base for holding the space replenishment material, and the manufacturing is easy. And since it is a sheet form, it can be used even if it piles up 1 sheet or several sheets.

The thickness of the rectifying wall can be 5 to 50 mm.
Since the thickness of the rectifying wall is 5 to 50 mm, the airflow can be effectively discharged without increasing the pressure loss.

  According to the ventilation port cover of the present invention, the pressure loss performance can be improved and the ventilation performance can be improved by providing the air flow control plate having the rectifying wall and the ventilation window inside the hood. In addition, a sound absorbing material such as a space replenishing material can be incorporated to make it difficult to transmit outdoor noise to the room. Furthermore, according to the vent cover of the present invention, it has a louver that opens forward on the lower side of the front, and has an external design that makes it easy for external noise to enter the vent cover. A high value-added ventilation port cover that can achieve both sound absorption performance and exhaust ventilation performance by using a sound absorbing material such as a space replenishment material for the airflow control plate. Can do.

It is a front view of the ventilation port cover of 1st Embodiment. It is a rear view of the ventilation port cover of FIG. It is a top view of the ventilation port cover of FIG. It is a bottom view of the ventilation port cover of FIG. It is a left view of the ventilation port cover of FIG. It is a right view of the ventilation port cover of FIG. It is a perspective view of the ventilation port cover of FIG. It is explanatory drawing which shows the state which attaches a food | hood front part to an insertion tube and an attachment frame in a center cross section. It is explanatory drawing which shows the ventilation hole cover with which the insertion pipe | tube and the hood were united in a center cross section. It is explanatory drawing explaining the attachment state of the airflow control board inside a hood, and is the figure seen from the insertion cylinder side which removed the attachment frame of the hood. It is explanatory drawing explaining the attachment state of the airflow control board inside a hood seen from the upper side (plane side) of the ventilation port cover. It is the figure seen from the back side (insertion cylinder side) of a hood in the state where the back sound absorption part was installed in the hood front part. It is the figure seen from the back side (insertion cylinder side) of a hood in the state which removed the back surface sound absorption part from the hood front part. FIG. 14 (a) is a diagram for explaining the arrangement of the airflow control plate and the rear sound absorbing portion viewed from the upper surface side of the ventilation port cover of the sample 1, and the shape of the airflow control plate viewed from the front side of the ventilation port cover. It is a figure explaining. FIG. 14 (b) is a diagram corresponding to the partial diagram 14 (a) of the sample 2. FIG. 14 (c) is a diagram corresponding to the partial diagram 14 (a) of the sample 3. FIG. 15 (a) is a diagram for explaining the arrangement of the airflow control plate and the rear sound absorbing portion as viewed from the upper surface side of the ventilation port cover of the sample 4, and the shape of the airflow control plate as viewed from the front side of the ventilation port cover. It is a figure explaining. FIG. 15 (b) is a diagram corresponding to the partial diagram 15 (a) of the sample 5. FIG. 15C is a diagram corresponding to the fractional view 15A of the sample 6. FIG. FIG. 16 (a) is a diagram for explaining the arrangement of the airflow control plate and the rear sound absorbing portion viewed from the upper surface side of the ventilation port cover of the sample 7, and the shape of the airflow control plate viewed from the front side of the ventilation port cover. It is a figure explaining. FIG. 16 (b) is a diagram corresponding to the fractional view 16 (a) of the sample 8.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. Components common to the following embodiments are denoted by the same reference numerals, and redundant description is omitted.

First Embodiment [FIGS. 1 to 14]:
1 to 6 are perspective views of the vent cover 11 of the present embodiment, and FIG. 7 is a perspective view thereof. The ventilation port cover 11 includes an insertion tube 12 that is inserted and connected to an outdoor side terminal of the ventilation port H that opens to the outer wall W of the building, and a hood 13 that covers the front of the insertion tube 12. An airflow control plate 15 to be described later is provided.
The indoor air enters the ventilation port cover 11 from the insertion tube 12 inserted into the ventilation port, passes through the air flow control plate 15 provided on the hood 13, and is discharged to the outside through the louver 16 provided on the front surface of the hood 13. It has become so. Next, each part which comprises the ventilation port cover 11 is demonstrated.

<Insert tube 12>
The insertion tube 12 has a cylindrical shape, and can be attached by being inserted into a ventilation port H provided on the outer wall W of the building from the outdoor side. As shown in FIG. 8, the opening 12a of the insertion tube 12 is provided with an outward flange 12b toward the outer peripheral side, and is fixed to a mounting frame 13e forming the back surface of the hood 13 described later with screws N or the like. Is done.

<Food 13>
The hood 13 is a portion that is provided in front of the plug-in cylinder 12 (outdoor side) and protrudes to the outdoor side of the ventilation port cover 11. The shape of the hood 13 is a substantially rectangular parallelepiped shape, and a louver 16 for discharging air to the outside is provided on the lower half of the front surface 13a having a substantially rectangular shape. Thus, since the louver 16 of this embodiment is opening ahead in the front 13a of the hood 13, it is easy to raise | generate a fall of pressure loss, and it is set as the structure where an outdoor noise tends to enter the inside of the hood 13 especially. ing.

  Further, as shown in FIG. 8, the front portion of the hood composed of a substantially rectangular top surface 13b, side surface 13c, and bottom surface 13d, as with the front surface 13a, is attached as a back surface portion together with the back surface sound absorbing portion 17 described later. It fits into the frame 13e and is fixed with screws N or the like. Thus, the hood 13 of the vent cover 11 is formed (see FIG. 9).

  The opening provided in the front surface 13a of the hood 13 employs the horizontal gallery 16 that opens continuously in the horizontal direction in the present embodiment, but is not limited thereto, and the opening continuously extends in the vertical direction. It is good also as a vertical gallery. Further, instead of a gallery, a simple net may be used.

<Airflow control plate 15>
FIG. 10 is an explanatory view for explaining the attachment state of the airflow control plate 15 inside the hood 13 as seen from the insertion tube 12 side with the attachment frame 13e of the hood 13 removed. Moreover, FIG. 11 is explanatory drawing explaining arrangement | positioning of the airflow control board 15 inside the food | hood 13 seen from the upper side (plane side) of the ventilation opening cover 11. As shown in FIG.

  As shown in these drawings, an airflow control plate 15 that regulates the air flow is provided inside the hood 13, and this airflow control plate 15 is also provided with a front surface 13 a (a louver 16) of the hood 13. In the present embodiment, a rectifying wall 15a is formed which is expanded in a V shape and becomes a standing wall standing from the bottom surface 13d to the upper surface 13b. . A ventilation window 15b opened in a substantially octagonal shape is provided in the central portion of the rectifying wall 15a, and serves as a vent for air flowing out of the room.

  The rectifying wall 15a can be formed of a metal plate, a resin plate, or the like, but a space replenishing material that functions as a sound absorbing material may be laminated with an adhesive or a double-sided tape attached thereto. Alternatively, the entire rectifying wall 15a can be formed of a space supplement material. In the present embodiment, a sheet-shaped space replenishment material is bent near the center in the width direction and formed into a V shape in plan view. Of course, two or more sheet-shaped space supplements may be arranged in a V shape instead of one.

  Examples of such space replenishment materials include resin fibers such as polyester fibers, porous bodies made of such plastic materials, nonwoven fabrics, glass wool, and the like, which have been conventionally used as sound absorbing materials for vent cover. Including those that have been made. The thickness of the rectifying wall 15a made of the space replenishing material itself, or the rectifying wall 15a formed by laminating the space replenishing material and a metal ridge or a resin plate as a base is preferably 5 mm to 60 mm, and 5 mm to 50 mm. More preferably, it is still more preferably 15 mm to 40 mm. If the thickness is less than 5 mm, the sound absorption effect cannot be expected. If the thickness exceeds 60 mm, the sound absorption effect is excellent, but the cost is high. Containment becomes difficult. By setting the thickness to 15 mm to 40 mm, the pressure loss coefficient can be lowered and the sound absorbing effect can be enhanced. The thickness of the rectifying wall 15a applied in this way has a width, but it is better to be thicker than thin to reduce the pressure loss. That is, as the thickness of the rectifying wall 15 a arranged in a V shape increases, the inner space of the hood 13 is occupied by the rectifying wall 15 a, and the airflow blown from the insertion tube 12 causes turbulence in the hood 13. This is because it becomes difficult to be rectified on the side surface of the rectifying wall 15 a and guided to the gallery 16.

  The ventilation window 15b penetrates the central portion of the airflow control plate 15, and can be circular, elliptical, or polygonal such as hexagonal or octagonal. The vent window 15b having such a shape can be configured so that the periphery thereof is surrounded by a rectifying wall. 15a may be formed in an inverted U shape (gate shape). The airflow control plate 15 shown in FIG. 10 has its bottom portion divided, and the rectifying wall 15a has an inverted U-shape.

  Further, as shown in FIG. 10, the air flow control plate 15 has its top, sides and bottom in contact with the top surface 13 b, side surface 13 c and bottom surface 13 d of the hood, and the ventilation window 15 b is located below the center of the air flow control plate 15. It is preferable to provide them. This is because air efficiently flows toward the louver 16 provided below the front surface 13a of the hood 13.

<Back sound absorption part 17>
In the hood 13, as shown in FIG. 8, a back sound absorbing portion 17 is provided in the mounting frame 13e. The back sound absorbing portion 17 is a portion that absorbs noise from the outside. Therefore, although the same material as the space replenishing material used in the rectifying wall 15a can be used for the back surface sound absorbing portion 17, it is preferable to use a sound absorbing material having an excellent sound absorbing effect.

  The back sound absorbing portion 17 has a hexagonal hole 17a at a portion facing the opening 12a of the plug-in cylinder 12, and the outer shape thereof is a shape along the outer shape of the mounting frame 13e. The thickness thereof is preferably 5 mm to 60 mm, more preferably 5 mm to 50 mm, and even more preferably 15 mm to 40 mm, like the airflow control plate 15. If the thickness is thinner than 5 mm, the sound absorbing effect is reduced. If the thickness exceeds 60 mm, the sound absorbing effect is excellent, but the cost is high, and the overall size is increased because the thickness is too thick. By setting the thickness to 15 mm to 40 mm, the pressure loss coefficient can be lowered and the sound absorbing effect can be enhanced.

  FIG. 12 is a view of the hood 13 as viewed from the back side (insertion tube 12 side) with the back surface sound absorbing portion 17 attached to the front portion of the hood. FIG. 13 is a view seen from the back side of the hood 13 (insertion tube 12 side) in a state where the back sound absorbing portion 17 is removed from the front portion of the hood. As can be seen from these drawings, the hole 17 a of the back sound absorbing portion 17 is formed in the same size at the same position as the opening 12 a of the insertion tube 12, and is located slightly above the center of the hood 13. . On the other hand, the ventilation window 15 b of the airflow control plate 15 is slightly larger than this, and is located slightly below the center of the hood 13.

<Action>
The airflow that reaches the insertion tube 12 through the ventilation hole H from the indoor side of the building blows into the hood 13. Although the airflow spreads inside the hood 13, the outlet of the airflow has only the ventilation window 15b, and the air spread inside the hood 13 flows into the ventilation window 15b while narrowing the flow path along the rectifying wall 15 reaching the ventilation window 15b. It reaches. At this time, since the ventilation window 15b of the airflow control plate 15 is provided slightly below the opening 12a of the insertion tube 12, the airflow proceeds downward. The airflow that has passed through the ventilation window 15b is discharged out of the ventilation port cover 11 through a gap between the louvers 16 provided in front of the ventilation window 15b.

  Moreover, when the space supplementary material which has a sound absorption effect is used for the rectification | straightening wall 15a, if outdoor noise enters the hood 13 from the clearance gap between the louvers 16, it will be absorbed by the airflow control plate 15 which expands. The noise that has passed through the ventilation window 15b of the air flow control plate 15 without hitting the air flow control plate 15 is also directly absorbed by the back sound absorbing portion 17 or is reflected in the hood 13 even after hitting the inner surface of the hood 13. The airflow control plate 15 or the back surface sound absorbing unit 17 is hit and absorbed. In this way, most of the external noise is absorbed in the vent cover 11. Therefore, the exhaust from the room can be suitably exhausted with little pressure loss, and the noise from the outside is effectively absorbed by the air flow control plate 15 and the back sound absorbing unit 17 and the noise reaching the room is reduced.

Second embodiment:
The vent cover of the present embodiment is also obtained by changing the shape of the airflow control plate.
In the vent cover 11 of the first embodiment, the rectifying wall is formed by a standing wall that expands in a V shape from the louver side provided at the front of the hood toward the opening side of the insertion tube. The rectifying wall can be formed by a horizontal plate that expands in a V shape from the louver side provided on the front side toward the opening side of the insertion tube. In other words, although the airflow control plate of the first embodiment spreads from the front surface 13a of the hood 13 toward the side walls 13c and 13c, the airflow control plate of the present embodiment is an upper surface from the front surface 13a of the hood 13. 13b and the bottom surface 13d. Even if such an airflow control plate is provided, it is possible to provide a ventilation port cover with excellent ventilation without increasing pressure loss.

Experimental example 1:
<Manufacture of specimen (sample)>
The front of the hood (13) is 232 mm in length and 332 mm in width, and a rectangular parallelepiped hood front part with a depth of 127 mm is formed of SUS plate material. A test body was manufactured in which a plug cylinder (12) formed of the same plate material and a mounting frame (13e) were fixed to a 63 mm cylindrical shape. The front hood (13a) of the hood (13) is provided with a horizontal louver (16) in its lower half. Further, a back sound absorbing portion (17) having a thickness of 25 mm and made of polyester fiber was attached to the inner mounting frame (13e) of the hood (13). In the back sound absorbing portion (17), a portion facing the opening (12a) of the insertion tube (12) is hollowed out to form a through hole (17a). Further, an airflow control plate (15) made of polyester fibers and having a thickness of 25 mm and having various shapes described below was also attached to the hood (13) as a sound absorbing material.

As sample 1, an octagonal ventilation window (15b) with a V-shaped opening from the front (13a) of the hood (13) toward the plug-in cylinder (12) is provided in the center. A straightening wall (15a) was attached. FIG. 14 (a) is a diagram for explaining the arrangement of the airflow control plate (15) and the rear sound absorbing portion (17) viewed from the upper surface (13b) side of the vent cover (11) of the sample 1 on the left side. Indicated. On the right side, the shape of the airflow control plate (15) viewed from the front (13a) is shown.
In the sample 2, as shown in FIG. 14B, the shape of the ventilation window (15b) provided on the rectifying wall (15a) was an ellipse.
In the sample 3, as shown in FIG. 14C, the shape of the ventilation window (15b) provided on the rectifying wall (15a) is a hexagonal shape.
As shown in FIG. 15 (a), the sample 4 has a rectifying wall (15a) in which a ventilation window (15b) having the same shape as that of the sample 1 is opened on a flat outer frame, and a hood (13). It was installed behind it in parallel with the front (13a).
In Sample 5, as shown in FIG. 15 (b), the shape of the ventilation window (15b) is the same as that of Sample 4, but the arrangement of the airflow control plate (15) is the central portion of the hood (13).
As shown in FIG. 15 (c), the sample 6 has the same shape of the ventilation window (15b) as the sample 4, but the arrangement of the air flow control plate (15) is arranged behind the hood (13), that is, It was placed in contact with the back sound absorbing part (17).
As shown in FIG. 16A, the sample 7 is contracted in an inverted V shape from the front surface (13a) of the hood (13) toward the insertion tube (12) (from the insertion tube (12) side, the hood ( 13) was expanded in a V-shape toward the front surface (13a) side), and a rectifying wall (15a) provided with an octagonal ventilation window (15b) with a notched bottom was attached to the center portion.
As shown in FIG. 16 (b), the sample 8 was provided with the back surface sound absorbing portion (17), but the airflow control plate (15) was not attached.

<Pressure loss coefficient and predicted noise>
For the samples 1 to 8, the pressure loss coefficient and the predicted noise level are obtained and shown in Table 1 below. The predicted noise level is measured in the room when the external noise is 70 db by measuring the sound transmission loss based on the sound intensity method using a real-time analyzer (“DS-9110” (trade name) manufactured by Ono Sokki Co., Ltd.). The predicted noise level was derived.

  Samples 1 to 3 provided with a rectifying wall that expands in a V shape from the hood side of the hood toward the opening of the plug-in tube are different in the shape of the ventilation window provided on the rectifying wall, but each sample has an air flow It can be seen that not only the noise level is lower than that of the sample 8 not provided with the control plate, but also the pressure loss coefficient is lowered, and the soundproofing performance can be enhanced while further improving the ventilation performance. From the value of the pressure loss coefficient, it can be seen that the ventilation window is preferably circular rather than square in terms of ventilation performance. Similarly, from the value of the pressure loss coefficient, the ventilation performance of the sample 1 and the sample 2 in which the sound absorbing material wraps around the bottom of the air flow control plate is larger than that of the sample 3 in which the sound absorbing material does not exist at the bottom of the air flow control plate. It turns out that it is excellent.

  Further, in the sample 7 provided in an inverted V shape with the airflow control plate facing in the opposite direction, the pressure loss coefficient becomes very large and the soundproofing effect is obtained, but the ventilation performance is deteriorated. Moreover, although the sample 4-6 which provided the airflow control board in parallel with the front surface has a soundproofing effect, it turns out that a pressure loss coefficient becomes large and makes ventilation performance worse.

Experimental example 2:
Regarding the airflow control plate having the same shape as that of Sample 1 of Experimental Example 1, the difference in the pressure loss coefficient when the thickness was changed was examined. As a result, when the airflow control plate is not provided inside the hood, the pressure loss coefficient is 2.28, and the pressure loss coefficient of the airflow control plate in which a metal plate having a thickness of 2 mm has the same shape as the sample 1 is 2.07 and the thickness is 17 mm. The pressure loss coefficient is 1.81 for the same material and the same shape as No. 1 and the thickness is 25 mm. The pressure loss coefficient for the same material and the same shape as Sample 1 is 1.72 and the same material and the same as Sample 1 when the thickness is 40 mm. The pressure loss coefficient in the case of the shape was the lowest 1.46. From this, it can be seen that as the thickness of the sound absorbing material used for the airflow control plate increases, the pressure loss coefficient decreases and the ventilation performance increases. In addition, the soundproofing effect is better as the sound absorbing material is thicker. Therefore, it can be seen that the thicker the sound absorbing material used, the better. As the thickness of the sound absorbing material arranged in a V shape increases, the space inside the hood is occupied by the sound absorbing material, and the airflow blown from the insertion tube into the hood creates turbulent flow inside the hood. It is presumed that the pressure loss coefficient becomes small because the side surface of the sound absorbing material becomes a rectifying wall and is guided without stagnation.

  The above-described embodiments and examples are exemplifications of the present invention, and modifications, partial deletions, additions, combinations, and the like of the embodiments can be made without departing from the spirit of the present invention. These techniques are also included in the scope of the present invention.

  For example, in order to enhance the soundproofing effect, it is preferable to include the back surface sound absorbing portion 17, but it is also possible to adopt a specification in which the back surface sound absorbing portion 17 is not provided. In the above-described embodiment, an example in which the airflow control plate 15 is arranged in a V shape by bending one sound absorbing material is shown, but two or more sound absorbing materials may be arranged in a V shape. In the above embodiment, the louver 16 of the hood 13 is disposed below the front surface 13a. However, other forms such as the center of the other front surface 13a may be used, and the position of the ventilation window 15b is changed accordingly. obtain. The shape of the hood 13 is a rectangular parallelepiped shape, but may be other shapes.

11 Ventilation port cover 12 Insertion tube 12a Opening 12b Outward flange 13 Hood 13a Front surface 13b Upper surface 13c Side surface 13d Bottom surface 13e Mounting frame (rear portion)
15 Airflow control plate 15a Rectifying wall 15b Ventilation window 16 Gully 17 Back sound absorption part 17a Hole W Exterior wall H Ventilation port

Claims (10)

In a vent cover comprising a plug that is inserted and connected to an outdoor terminal of a vent opening that opens on the outer wall of the building, and a hood that covers the front of the plug cylinder,
It has an airflow control plate in the hood,
This airflow control plate has a rectifying wall that widens from the opening side provided in the front of the hood toward the opening side of the insertion tube, and a ventilation window that serves as a vent provided in the rectifying wall. Ventilation cover to be used.
The ventilation opening cover according to claim 1, wherein the rectifying wall expands in a V shape from the opening side provided on the front surface of the hood toward the opening side of the insertion tube.
The ventilation port cover according to claim 1 or 2, wherein the ventilation window passes through a central portion of the airflow control plate.
The ventilation port cover according to any one of claims 1 to 3, wherein the ventilation window is formed by dividing the bottom of the airflow control plate and forming the rectifying wall in an inverted U shape.
The ventilation port cover according to any one of claims 1 to 4, wherein an outer shape of the ventilation window is an octagonal shape.
The upper part, the side part, and the bottom part of the airflow control plate are in contact with the top surface, the side surface, and the bottom surface of the hood, and the ventilation window is provided below the center of the airflow control plate. The vent cover described.
The ventilation opening cover according to any one of claims 1 to 6, wherein the opening is a louver provided below the front of the hood.
The ventilation port cover according to any one of claims 1 to 7, wherein the rectifying wall is formed by laminating a space replenishment material on a metal or resin plate serving as a base.
The ventilation opening cover according to any one of claims 1 to 7, wherein the rectifying wall is entirely formed of a sheet-like space supplement material.
  The ventilation opening cover according to claim 8 or 9, wherein the thickness of the rectifying wall is 15 mm to 40 mm.

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