JP5258712B2 - Ventilation hood - Google Patents

Description

  The present invention relates to a ventilation hood, and more particularly to a ventilation hood that is attached to a ventilation opening opened on a wall surface of a building and used for indoor and outdoor ventilation.

  Conventionally, in order to prevent wind and rain, wild birds, etc. from entering the room through the ventilation openings opened on the wall of the building, etc., a ventilation hood used for indoor and outdoor ventilation has been attached to the ventilation openings to cover the ventilation openings. Has been done.

  Such a ventilation hood is installed in a state of protruding from the outer wall surface, and is made of a metal material such as an aluminum alloy or a steel plate. Therefore, when a raindrop or the like drops on the ventilation hood during rain, a loud collision noise is generated.

  In addition, this dripping sound such as raindrops enters the room using the ventilation route such as a ventilation duct as a transmission path and causes noise in the room, or if the next house is approaching, it also sounds as noise in the next house. was there.

  For this reason, in conventional ventilation hoods, an elastic member such as rubber is affixed to the inner top surface of the ventilation hood to increase the rigidity of the ventilation hood top surface (raindrop surface), and measures are taken to reduce impact noise. There is what I did.

  It is also known to provide a silencer mechanism or a vibration control mechanism in the ventilation hood or in the ventilation path in order to reduce collision noise such as raindrops (Patent Documents 1 and 2).

JP-A-9-14711 JP 2006-57491 A

  However, in the method of attaching an elastic member to the inner top surface portion of the ventilation hood, when raindrops or the like collide with the ventilation hood, the impact vibration spreads along the ventilation path, which causes a problem that noise enters the room.

  In addition, the method of providing a silencer mechanism in the ventilation path has a problem that the air path resistance increases and the ventilation air volume decreases.

  Furthermore, in the method of providing a vibration control mechanism inside the ventilation hood, vibration can be controlled without reducing the ventilation air volume, but since the hood itself becomes a vibration source, a large noise reduction effect cannot be expected. There was a problem.

  The present invention has been made in view of the above, and it is an object of the present invention to obtain a ventilation hood capable of reducing noise caused by collision noise such as raindrops without reducing ventilation air volume due to an increase in air path resistance. And

In order to solve the above-described problems and achieve the object, the ventilation hood of the present invention covers a pipe guide having an opening communicating with the interior of a building, an outside of the opening of the pipe guide, and a downward direction. It is arranged on the upper surface side of the hood part so as to leave a space between the hood part opened toward the hood part without directly contacting the hood part, and by receiving raindrops dropped from above In the space between the upper surface of the hood part and the back surface of the vibration control cover, the raindrop is configured not to collide with the upper surface of the hood part, and is inclined toward the front surface and the end surfaces of both sides. And a support portion that is disposed and supports the vibration damping cover from the upper surface side of the hood portion .

  According to this invention, there is an effect that it is possible to reduce the noise caused by the collision sound such as raindrops without reducing the ventilation air volume due to the increase of the air path resistance.

FIG. 1 is a perspective view showing a schematic configuration of Embodiment 1 of a ventilation hood 2 according to the present invention. 2A is a front view showing a schematic configuration of the ventilation hood 2 of FIG. 1, and FIG. 2B is a side view showing a schematic configuration of the ventilation hood 2 of FIG. 1. FIG. 3 is an exploded perspective view showing the ventilation hood 2 of FIG. FIG. 4 is a perspective view showing a state when the ventilation hood 2 of FIG. 1 is mounted on the wall surface 17 of the building. FIG. 5 is a cross-sectional view showing a state when the ventilation hood 2 of FIG. 1 is mounted on the wall surface 17 of the building. FIG. 6 is a perspective view showing a schematic configuration of the upper surface of the hood portion 2a when the ventilation hood 2 of FIG. 1 is cut along the line AA ′. FIG. 7A is a top view showing a schematic configuration of the elastic member 8 of FIG. 6, and FIG. 7B is a side view and a cross-sectional view showing a schematic configuration of the elastic member 8 of FIG. 8A is a cross-sectional view showing the propagation direction of the impact vibration B of the conventional ventilation hood 42, and FIG. 8B is a cross-sectional view showing the propagation direction of the impact vibration B of the ventilation hood 2 of FIG. . FIG. 9 is a cross-sectional view showing a schematic configuration of a laboratory that performs the raindrop sound reduction effect demonstration test of the ventilation hood 2 according to the present invention.

  Hereinafter, an embodiment of a ventilation hood according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
1 is a perspective view showing a schematic configuration of Embodiment 1 of a ventilation hood 2 according to the present invention, FIG. 2A is a front view showing a schematic configuration of the ventilation hood 2 of FIG. 1, and FIG. 1 is a side view showing a schematic configuration of the ventilation hood 2 of FIG. 1, FIG. 3 is an exploded perspective view of the ventilation hood 2 of FIG. 1, and FIG. 4 is a perspective view showing the ventilation hood 2 of FIG. It is a perspective view which shows a state when mounting | wearing.

  1 to 4, the ventilation hood 2 is attached to a ventilation opening opened on a wall surface 17 of a building and used for indoor and outdoor ventilation. Here, the ventilation hood 2 includes a cylindrical pipe guide 1 having an opening 21 communicating with the interior of the building, and the hood 2 a that covers the outside of the opening 21 of the pipe guide 1 and opens downward. A base plate 3 that connects the pipe guide 1 and the hood portion 2a and fixes them to the wall surface 17 and a vibration suppression cover 7 that suppresses propagation of impact vibration to the hood portion 2a are provided.

  Here, the pipe guide 1 is connected to a ventilation port communicating with the room opened on the wall surface 17 of the building, etc., so that the outside air can be supplied to the room or the room air can be discharged to the outside. it can. The hood part 2a can prevent wind and rain, wild birds, and the like from entering the room through a ventilation opening opened on the wall surface of the building. Here, the hood part 2a is provided with an opening 19 on the lower side. The hood portion 2a is provided with an exhaust air flow away from the wall surface 17 in order to prevent rain, birds, etc. from entering the opening portion 19 or to prevent the wall surface 17 from being contaminated by the exhaust air flow. A gallery 5 for changing the wind direction is provided. In order to more effectively prevent wind and rain and insects from entering the hood portion 2a, a net 6 that is fixed to the opening 21 of the pipe guide 1 may be provided.

  The base plate 3 has a groove 15 for fixing a caulking 20 to prevent the intrusion of rainwater from between the wall surface 17, a hole 4 disposed on the front surface for fixing the wall surface 17 with a screw, and rainwater when it rains. A wide drainer 16 is provided to drop water drops hanging from the ventilation hood 2 away from the wall surface 17 so as not to contaminate the wall surface 17 through the wall surface 17.

  The vibration control cover 7 is disposed on the upper surfaces of the hood portion 2a and the base plate 3, and is configured to receive raindrops and the like dropped from above by the vibration control cover 7 so as not to collide with the upper surface of the hood portion 2a.

  FIG. 5 is a cross-sectional view showing a state when the ventilation hood 2 of FIG. 1 is mounted on the wall surface 17 of the building. In FIG. 5, a wall surface 17 of the building is provided with a ventilation port 18 for supplying outside air to the room or exhausting indoor air to the outside. Communicate. The ventilation hood 2 is connected to a terminal of a ventilation port 18 that communicates with a room opened on the wall surface 17.

  When the outside air is supplied to the room or the room air is exhausted to the outside, an air flow Z is generated between the room and the outside. Here, by connecting the ventilation hood 2 to the ventilation port 18, it is possible to prevent wind, rain, insects, birds and the like from entering the room through the ventilation port 18.

  6 is a perspective view showing a schematic configuration of the upper surface of the hood portion 2a when the ventilation hood 2 of FIG. 1 is cut along the line AA ′, and FIG. 7A is a schematic diagram of the elastic member 8 of FIG. FIG. 7B is a side view and a cross-sectional view showing a schematic configuration of the elastic member 8 in FIG. 6.

  6 and 7, the vibration damping cover 7 is supported on the hood portion 2 a via the support portion 30. The support portion 30 can provide a space between the vibration damping cover 7 and the hood portion 2a so that the vibration damping cover 7 and the hood portion 2a do not directly contact each other.

  Here, the support portion 30 is provided with an elastic member 8 for attenuating impact vibration transmitted from the damping cover 7 to the hood portion 2a. Then, on the upper surface of the hood portion 2a, the elastic member 8 can be sandwiched between the damping cover 7 and the cushioning material, and the damping cover 7 can be fixed and integrated on the upper surface of the hood portion 2a.

  Here, a hole 9 for inserting the elastic member 8 is formed on the upper surface of the hood portion 2 a, and a groove 10 that sandwiches the periphery of the hole 9 with the elastic member 8 is formed in the elastic member 8 at the center of the elastic member 8. It is formed along the diameter in the vicinity. A through hole 31 for inserting the metal cylinder 11 is formed at the center of the elastic member 8. And the damping cover 7 can be fitted so that it may be pinched | interposed into the hole 9 opened in the upper surface of the hood part 2a with the groove | channel 10 in the center of the elastic member 8. FIG.

  In this case, when the damping cover 7 is fixed to the hood portion 2a via the elastic member 8, the elastic member 8 is sandwiched between the elastic member 8 and the elastic member 8 so that the elastic member 8 is not crushed and deformed by load. The metal cylinder 11 having the same height as 8 may be inserted so that the elastic member 8 is not directly tightened.

  When the damping cover 7 is fixed to the hood portion 2 a via the elastic member 8, the screw 12 is inserted into the through hole of the metal tube 11 and tightened with the welding nut 14 disposed on the back surface of the damping cover 7. be able to. A washer 13 may be attached to the screw 12 so that the elastic member 8 does not come off when the screw 12 is tightened.

  Here, a support plate 29 is provided on the back surface of the vibration damping cover 7, and the welding nut 14 is welded to the support plate 29. The support plate 29 can be configured to be bent so that the propagation distance of the impact vibration transmitted from the damping cover 7 to the hood portion 2a is increased. For example, a thin plate having a thickness of about 1 mm can be bent into a Z shape.

  Here, by attaching the elastic member 8 between the hood portion 2a and the vibration damping cover 7 via the support plate 29, the distance for attenuating the sound transmitted from the vibration damping cover 7 is lengthened and the soundproofing effect is enhanced. And a spatial distance can be secured between the vibration control cover 7 and the hood portion 2a.

  The shape of the vibration damping cover 7 can correspond to the shape of the upper surface of the hood portion 2a, and may be inclined toward the front surface and the end surfaces on both sides. Thereby, it can prevent that the ultraviolet-ray from the sun in the daytime is irradiated to the elastic member 8 directly, and deterioration by the ultraviolet-ray of the elastic member 8 can be prevented. In addition, it is possible to prevent raindrops and the like from accumulating on the upper surface of the vibration damping cover at the time of rain, and it is possible to prevent corrosion and dirt due to corrosion-causing substances such as rainwater accumulated on the upper surface of the vibration damping cover 7.

  Further, when the vibration control cover 7 is held in a hollow state through a space of about 10 mm across the upper surface of the hood portion 2a and the elastic member 8, ultraviolet rays from the sun during the day are directly irradiated to the elastic member 8. In order to prevent this, it is preferable to set the gap between the vibration damping cover 7 and the end of the hood portion 2a between 1 mm and 5 mm.

  Further, the vibration damping cover 7 may be supported at two locations via the hood portion 2a and the elastic member 8, or may be supported at one location or three or more locations.

  In addition, when the hood portion 2 a to which the vibration damping cover 7 is attached is attached to the wall surface 17, it is preferable that the vibration damping cover 7 is not in contact with the wall surface 17. Thereby, even when falling objects such as raindrops collide with the vibration damping cover 7, it is possible to prevent the shock vibration from being transmitted to the wall surface 17 and generating noise different from raindrop sounds.

  Further, it is preferable that the elastic member 8 and the screw 1 are not exposed when the vibration damping cover 7 is attached to the hood portion 2a. As a result, the design surface can be prevented from deteriorating and the elastic member 8 and the screw 1 can be prevented from being deteriorated or corroded.

  8A is a cross-sectional view showing the propagation direction of the impact vibration B of the conventional ventilation hood 42, and FIG. 8B is a cross-sectional view showing the propagation direction of the impact vibration B of the ventilation hood 2 of FIG. . In FIG. 8A, in the conventional ventilation hood 42, the damping material 21 is directly attached to the hood 42a. For this reason, when a drop M such as raindrops collides with the hood 42a, the impact vibration B propagates to the entire surface of the hood 42a, and the impact vibration B spreads along the ventilation path, so that noise enters the room.

  On the other hand, in the ventilation hood 2 of FIG. 1, the vibration damping cover 7 is supported with a space on the hood portion 2a via the support portion 30, and is configured not to directly contact the hood portion 2a. . As a result, it is possible to prevent the dropped matter M such as raindrops from directly colliding with the hood portion 2a, and even when the impact vibration B is generated in the vibration control cover 7 due to the dropping of the dropped matter M, it is elastic. It can be prevented from being transmitted from the path other than the member 8 to the hood portion 2a side, and it is possible to suppress the noise caused by the collision sound such as raindrops from entering the room.

  Further, by using the elastic member 8 as the support portion 30, the impact vibration B transmitted to the support portion 30 can be absorbed. For this reason, even when the vibration damping cover 7 is supported on the hood part 2a via the support part 30, the shock vibration B generated in the vibration damping cover 7 is prevented from being transmitted to the hood part 2a. Can do.

  As described above, according to the first embodiment of the present invention, the vibration damping cover 7 is supported on the hood portion 2a through the support portion 30 with a space, thereby dropping on the upper surface of the hood portion 2a. It is possible to prevent a drop M such as raindrops coming from directly colliding with the ventilation hood 2. For this reason, the vibration of the ventilation hood 2 generated at the time of the collision of the drop M can be suppressed, and the collision sound generated at that time is prevented from entering the room through the ventilation hood 2 and the ventilation port 18 communicating with the room. be able to.

  Note that an elastic sheet such as rubber is attached to the vibration damping cover 7 in order to reduce the collision sound generated from the vibration damping cover 7 itself when the dripping material M such as raindrops drops on the vibration damping cover 7. It may be.

  FIG. 9 is a cross-sectional view showing a schematic configuration of a laboratory that performs the raindrop sound reduction effect demonstration test of the ventilation hood 2 according to the present invention. In FIG. 9, the test chamber is two rooms, the sound source chamber 22 is the outdoor side, and the sound receiving chamber 23 is the indoor side. A hole for a ventilation port was provided in the partition wall 24, and a spiral tube 25 was attached to the hole toward the room side. The length H22 of the spiral tube 25 was set to 300 mm. Nothing was attached to the indoor side end portion of the spiral tube 25, and the ventilation tube 2 was attached to the outdoor side. In order to block noise from outside the test room both indoors and outdoors, an enclosure is provided with a sound absorbing material 26 so that only raindrops dripping onto the ventilation hood 2 can be measured. In this state, the background noise was set to around 30 dB [A].

  Then, a water droplet of 0.1 cc to 0.5 cc per second is dropped from the faucet 27 on the upper surface of the ventilation hood 2 for 20 seconds, and the raindrop sound noise that has entered the indoor side from the end of the spiral pipe 25 on the indoor side is detected by the noise meter 28. Measured at The height H3 of the faucet 27 from the ventilation hood 2 was set to 2000 mm. The distance H1 between the spiral tube 25 and the sound level meter 28 was set to 500 mm. In this measurement, the sound pressure level in each frequency band is measured in the A range (hereinafter referred to as [A]) closest to human hearing, the result in each frequency band is calculated, and the all-pass value (hereinafter referred to as [AP] in Table 1 below) is calculated. ).

  As apparent from Table 1, the ventilation hood 2 of FIG. 1 has a raindrop sound reduction effect of −18.3 dB [A] compared to the conventional ventilation hood 42. Compared with the invention of Patent Document 1, a raindrop sound reduction effect of -8.6B [A] was obtained. Moreover, in invention of patent document 1, compared with the conventional ventilation hood 42, it was the raindrop sound reduction effect of -8.6B [A].

  As described above, the ventilation hood according to the present invention can prevent the raindrops falling on the upper surface of the hood portion from directly colliding with the ventilation hood, and reduce the ventilation air volume by increasing the air path resistance. It is suitable for a method of reducing noise caused by collision sound such as raindrops.

DESCRIPTION OF SYMBOLS 1 Pipe guide 2 Ventilation hood 2a Hood part 3 Base plate 4, 9 hole 5 Gallery 6 Net | network 7 Damping cover 8 Elastic member 10, 15 Groove 11 Metal cylinder 12 Screw 13 Washer 14 Welding nut 16 Wide draining 17 Wall 18 Ventilation opening 19, DESCRIPTION OF SYMBOLS 21 Opening part 20 Coking 22 Sound source room 23 Sound receiving room 24 Bulkhead 25 Spiral tube 26 Sound absorbing material 27 Faucet 28 Noise meter 29 Support plate 30 Support part 31 Through-hole

Claims (6)

A pipe guide having an opening communicating with the interior of the building;
A hood that covers the outdoor side of the opening of the pipe guide and opens downward,
The raindrops are arranged on the upper surface side of the hood portion so that there is a space between the hood portion without directly contacting the hood portion, and the raindrops are received on the upper surface of the hood portion by receiving raindrops dripped from above. A vibration damping cover that is configured not to collide and that is inclined toward the front surface and the end surfaces of both sides;
A support portion that is disposed in a space between the upper surface of the hood portion and the back surface of the damping cover, and supports the damping cover from the upper surface side of the hood portion;
The ventilation hood characterized by comprising. The ventilation hood according to claim 1 , wherein the support portion includes an elastic member that attenuates shock vibration transmitted from the vibration-damping cover to the hood portion. The ventilation hood according to claim 2 , wherein the elastic member is made of rubber. The ventilation hood according to claim 2 , wherein the support portion further includes a support plate that connects the elastic member to the vibration damping cover. The ventilation hood according to claim 4 , wherein the support plate is bent so that a propagation distance of an impact vibration transmitted from the vibration damping cover to the hood portion is increased.   The vibration control cover is configured so that the vibration control cover and the wall surface do not come into contact with each other when the hood portion to which the vibration control cover is attached is attached to the wall surface. The ventilation hood as described in any one of 5.

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