JP7208831B2 - Vent terminal member and building - Google Patents

Description

TECHNICAL FIELD The present invention relates to a ventilation opening terminal member or the like having a structure in which a water droplet receiving plate is provided on a top plate of a hood portion via an elastic support.

Buildings such as collective housing, hotels, and office buildings are obliged to install ventilation equipment. As the ventilation equipment, a ventilation opening is installed in a living room, and a ventilation opening terminal member called a vent cap or the like is often installed on the outer wall of the living room.
The ventilation port terminal members are attached to the ventilation holes in the outer walls of the upper and lower floors of the building so that the hood protrudes outward from the outer wall surface, and the ventilation port terminal members of the upper and lower floors are positioned on a vertical line. There are many things.
In the building concerned, after rainfall, etc., when water droplets fall from the upper floor ventilation port terminal member and collide with the hood top plate of the lower floor ventilation port terminal member, a water drop collision sound is generated. , the water droplet impact sound propagates into the living room as solid-borne sound.
As a ventilation opening terminal member that takes measures to reduce the water droplet impact sound, for example, a structure in which a water droplet receiving plate is provided on the top plate of the hood via an elastic support is known ( See Patent Document 1).

Japanese Patent No. 5258712

In the vent terminal member disclosed in Patent Document 1, the water droplet receiving plate includes a central plate portion for receiving water droplets and a peripheral plate portion provided around the central plate portion, and the central plate portion extends horizontally. The peripheral plate portion has an inclined surface that slopes downward from the surface of the central plate portion.
In the case of this configuration, the vibration when water droplets collide with the surface of the central plate portion of the water droplet receiving plate is amplified at the peripheral portion of the central plate portion of the water droplet receiving plate and radiated into the space via the peripheral plate portion. , there is a problem that a long-sounding metallic sound is generated, and the sound may be felt as an unpleasant sound.
DISCLOSURE OF THE INVENTION The present invention provides a ventilation opening terminal member or the like that can reduce the resonance of sound generated when water droplets collide with the central plate portion of the water droplet receiving plate.

A ventilation port terminal member according to the present invention is a ventilation port terminal member attached to a ventilation hole formed in an outer wall of a building, and includes a hood portion projecting from the outer wall surface of the building to the outside of the building, and a top plate of the hood portion. A water droplet receiving plate provided thereon via an elastic support, and a damping material, wherein the water droplet receiving plate is formed of a rectangular plate for receiving water droplets, and the surface of the water droplet receiving plate is a rectangular top plate with a hood portion. A center plate portion arranged so as to face the plate surface in parallel with a predetermined interval, and a hood portion corresponding to each side edge of a rectangular plate provided around the center plate portion and constituting the center plate portion a peripheral plate formed by sloping plates sloping toward each edge of the rectangular plate of the top plate, the peripheral plate extending from each long edge of the rectangular plate forming the central plate and a short edge side peripheral plate portion provided so as to extend from each short edge of the rectangular plate constituting the central plate portion, and the vibration damping material is long It is characterized by being attached to the edge side peripheral plate portion.
In addition, the peripheral plate portion has a length dimension and a plate thickness dimension in a direction extending from the central plate portion so that vibrations in an octave band of 1 kHz to 4 kHz are emitted when water droplets collide with the central plate portion of the water droplet receiving plate. The vibration damping material is characterized by suppressing vibrations in the 1 kHz to 4 kHz band of the peripheral plate portion.
Also , the damping material is adhered to the back surface of the inclined surface of the peripheral plate on the long side edge .
Further, the damping material is characterized by using one formed using rubber asphalt.
According to the ventilation port terminal member of the present invention, since the damping material is attached to the peripheral plate portion, when water droplets collide with the central plate portion of the water droplet receiving plate, the water droplets are radiated from the peripheral plate portion to the space. It is possible to suppress the vibration caused by the water droplet receiving plate, and reduce the reverberation of the sound generated when the water droplets collide with the central plate portion of the water droplet receiving plate.
Further, a building according to the present invention is a building in which any of the vent terminal members described above is provided on the outer wall so that the hood portion and the water droplet receiving plate of the vent terminal member protrude outward from the outer wall surface. Since the surface of the center plate of each water droplet receiving plate of each ventilation port terminal member provided on the outer wall of the upper and lower floors of the building was positioned on a vertical line, water droplets fell from the upper floor ventilation port terminal member. Therefore, it is possible to reduce the reverberation of the sound generated when it collides with the central plate portion of the water droplet receiving plate of the terminal member of the ventilation port on the lower floor.

The perspective view which looked at the ventilation port terminal member from the front side (embodiment). The perspective view which looked at the ventilation port terminal member from the rear side (embodiment). Front view of the vent terminal member (embodiment). Rear view of the vent terminal member (embodiment). The figure which shows the state where the water droplet falls to the lower ventilation port terminal member from the upper ventilation port terminal member attached to the outer wall of the upper and lower floors of a building (embodiment). Sectional drawing (embodiment) which shows the structure of the vibration isolator of a ventilation port terminal member. FIG. 3 is an exploded perspective view of the vent terminal member (embodiment); The top view which looked at the elastic support body from the top (embodiment). FIG. 4 is a bottom (rear surface (lower surface)) view of the water droplet receiving plate viewed from below (embodiment). The figure which shows an experimental result.

Embodiment As shown in FIGS. 1 to 6, the ventilation port terminal member 1 according to the embodiment is a cylindrical portion inserted into a ventilation hole 92 formed in an outer wall 91 of a building 90 so as to communicate with the inside and outside of the building 90. 2, a hood portion 3 protruding outside the building 90 from an outer wall surface 93 of the building 90, and a water droplet receiving plate 5 provided on a top plate 32 of the hood portion 3 via a plate-shaped elastic support 4. , and a damping material 6, the water droplet receiving plate 5 includes a central plate portion 51 that receives water droplets W falling from above, and a peripheral plate portion that is provided around the central plate portion 51 and radiates vibration, A damping material 6 is attached to the peripheral plate portion.
In addition, a through hole (slit) X is provided in a portion of the elastic support 4 that is not in contact with the top plate 32 of the hood portion 3 and the water droplet receiving plate 5 , and the water droplet receiving plate 5 and the elastic support 4 The primary natural frequency _f0 of the constructed vibration isolator is set to a frequency of 16 Hz or more and 125 Hz or less in the octave band.
The cylindrical portion 2, the hood portion 3, and the water droplet receiving plate 5 of the vent terminal member 1 are formed of metal plates, for example.
In this specification, the top, bottom, left, right, front, and rear of the ventilation port terminal member 1 are defined as the directions shown in FIGS.

As shown in FIGS. 1 and 2, the hood portion 3 is a rectangular parallelepiped having a square front plate 31, a top plate (upper plate) 32, a left plate 33, a right plate 34, and a rear plate 35. An indoor ventilation hole formed in the outdoor ventilation hole 36 (see FIG. 1) which is formed in a box shape and whose lower part is open, and which is opened at the center side of the rectangular plate forming the rear plate 35. 37 , and one end opening edge side of the cylindrical portion 2 is connected to the hole edge side of the indoor-side ventilation hole 37 . That is, the tubular portion 2 is connected to the rear plate 35 of the hood portion 3 and is provided so as to extend rearward of the rear plate 35 . The cylindrical portion 2 is formed in a cylindrical portion, for example.
In other words, the hood part 3 can be ventilated from the inside of the building 90 to the outside of the building 90 through the lower outdoor side ventilation hole 36 and the indoor side ventilation hole 37 by attaching the ventilation port end member 1 to the ventilation hole 92 . Alternatively, air can flow from the outside of the building 90 to the inside of the building 90.
At least one of the outdoor ventilation hole 36 and the indoor ventilation hole 37 is formed in the louver 38 (see FIG. 1).

In other words, the hood portion 3 includes a square front plate 31 , a rear plate 35 having a plate surface facing the plate surface of the front plate 31 , and an upper side of the square of the front plate 31 and the square of the rear plate 35 . a left side plate 33 connecting the left side of the square extending downward from one end of the upper side of the square of the front plate 31 and the left side of the square rear plate 35 extending downward from one end of the upper side of the square; The right side plate 34 connects the right side of the square extending downward from the other end of the upper side of the square of the front plate 31 and the right side of the rear plate 35 extending downward from the other end of the upper side of the square. 1 is attached to the ventilation hole 92, the space surrounded by the front plate 31, the top plate 32, the left side plate 33, the right side plate 34, and the rear plate 35 is exposed to the outside through the lower outdoor side ventilation hole 36. , and communicates with the interior of the room via the interior ventilation holes 37 of the rear plate 35 .

That is, the ventilation port terminal member 1 is inserted into the ventilation hole 92 formed in the outer wall 91 of the building 90 from the other end side of the tubular portion 2, and the rear surface 35a of the rear plate 35 of the hood portion 3 is inserted into the building. 90, and installed so that the top plate 32 is positioned above, the left side plate 33 is positioned on the left side, and the right side plate 34 is positioned on the right side.
For example, a plate spring (not shown) is provided on the outer peripheral surface of the cylindrical portion 2, and when the cylindrical portion 2 is pushed into the ventilation hole 92, the plate spring is pressed against the inner surface of the ventilation hole 92 by spring elasticity. The ventilation port terminal member 1 is fixed to the ventilation hole 92 by being attached, and in this fixed state, a sealing material is filled in the gap between the upper edge, the left edge, and the right edge of the rear plate 35 of the hood part 3 and the outer wall surface 93. The ventilation port end member 1 is attached to the ventilation hole 92 by filling a gap filler such as a filler.

Further, at the lower end side of the rear plate 35 of the hood portion 3, there is a drain that receives water flowing along the plate surface of the hood portion 3 and directs the received water to the front side of the outer wall surface 93 away from the outer wall surface 93. A portion 39 is provided.
For example, the draining portion 39 protrudes from a back plate 39a formed by a portion of the rear plate 35 of the hood portion 3 that protrudes below the outdoor ventilation hole 36, and from left and right side edges of the back plate 39a on the lower end side. Projecting pieces 39b, 39b, an inclined piece 39c projecting forward and downward from the lower end of the back plate 39a and the lower ends of the left and right projecting pieces 39b, 39b, and the left and right side edges of the inclined piece 39c. This is a configuration including left and right regulation pieces 39d, 39d provided.
Since the draining portion 39 is provided, the water droplets flowing along the plate surface of the hood portion 3 flow down to the front side of the outer wall surface 93 via the inclined piece 39c, and the ventilation attached to the ventilation hole 92 on the lower floor. Since the water droplets fall on the surface (upper surface) of the water droplet receiving plate 5 of the mouth terminal member 1, it is possible to prevent the water droplets from flowing down along the outer wall surface 93 and to prevent the outer wall surface 93 from being left with water marks.

The water droplet receiving plate 5 provided on the top plate 32 of the hood portion 3 via the elastic support 4 is composed of a roof-shaped plate member arranged so as to cover the top plate 32 of the hood portion 3. .
As shown in FIG. 1, for example, the surface of the water droplet receiving plate 5 is formed into a roof shape in which the top of the hipped roof is a similar rectangular planar shape that is one size smaller than the rectangle of the top plate 32 of the hood portion 3. be done.
In the water droplet receiving plate 5, the center 5C of the rectangle forming the surface of the central plate portion 51 is orthogonal to the plate surface of the top plate 32 of the hood portion 3, and the center of the rectangle forming the surface of the top plate 32 is perpendicular to the surface of the top plate 32. It is provided on the top plate 32 of the hood portion 3 via the elastic support 4 so as to be positioned on the vertical line V passing through.

Then, as shown in FIG. 1 is provided, and the centers 5C, 5C of the surfaces of the central plate portions 51, 51 of the respective water droplet receiving plates 5, 5 of the respective ventilation port end members 1, 1 are positioned on the vertical line V to form a building 90. be.
In the building 90, the water that flows along the plate surface of the hood portion 3 of the vent terminal member 1 installed on the upper floor and flows into the water draining portion 39 passes through the front end of the inclined piece 39c of the water draining portion 39 and flows to the lower floor. It falls on the surface (upper surface) of the water droplet receiving plate 5 of the vent terminal member 1 attached to the .

The water droplet receiving plate 5 is formed of, for example, a rectangular plate that is one size smaller than the rectangle of the top plate 32 of the hood portion 3, and the plate surface is separated from the plate surface of the top plate 32 of the hood portion 3 by a predetermined distance. The center plate portion 51 is arranged so as to face in parallel, and each side edge of the rectangular plate forming the center plate portion 51 approaches each side edge of the corresponding rectangular plate of the top plate 32 of the hood portion 3. and a peripheral plate portion formed by an inclined plate, the peripheral plate portion being provided so as to extend from each long side edge of the rectangular plate forming the central plate portion 51. , 52, and short side peripheral plate portions 53, 53 provided so as to extend from the respective short side edges of the rectangular plate forming the central plate portion 51. As shown in FIG.
That is, the water droplet receiving plate 5 is configured such that the central plate portion 51 extends horizontally and has a surface for receiving water droplets, and the peripheral plate portion has an inclined surface that is inclined downward from the surface of the central plate portion 51 . It is

The natural frequency of the vibration radiated from the peripheral plate portion to the space when water droplets collide with the surface of the central plate portion 51 is theoretically obtained by the following equation.

In the embodiment, the length dimension (hereinafter referred to as “width dimension”) H of the long edge side peripheral plate portion 52 of the water droplet receiving plate 5 in the direction extending from the central plate portion 51 is set to 12 mm. The thickness dimension is set to 1.2 mm, and when a water droplet collides with the surface of the central plate portion 51, vibration in the octave 2 kHz band is especially radiated.

In the embodiment, when a water droplet collides with the surface of the central plate portion 51, in order to suppress the vibration of the octave 2 kHz band radiated into the space by the long edge side peripheral plate portions 52, 52, FIG. 7, as shown in FIG. 9 and the like, the damping material 6 is adhered to the back surface (lower surface) of the inclined surface (upper surface) of the long edge side peripheral plate portions 52, 52, and the damping material 6 and the long side are bonded to each other. It is configured to be integrated with the edge side peripheral plate portion 52 .
As the damping material 6, for example, one formed using rubber asphalt was used. Specifically, a product name “RA sheet” (manufactured by Ube Industries, Ltd.) was used as the damping material 6 . The RA sheet is a self-adhesive layer type sheet formed by press-bonding a polyester long fiber nonwoven fabric base material impregnated with rubber asphalt and an asphalt adhesive layer. 5.0-15% hydrocarbons and 25-35% others.

That is, in the embodiment, the width dimension H of the long edge side peripheral plate portion 52 having a large area among the peripheral plate portions is set to 12 mm, and the plate thickness dimension of the long edge side peripheral plate portion 52 is set to 1.2 mm. In order to suppress the vibration radiated into the space by the long edge side peripheral plate portion 52 when water droplets collide with the surface of the portion 51, the back surface (lower surface) of the inclined surface (upper surface) of the long edge side peripheral plate portion 52 ) to form a damping plate 5 in which the damping material 6 and the long edge side peripheral plate portion 52 are integrated.

Further, in the embodiment, in order to provide a high-quality ventilation port terminal member 1 by reducing variations in the sound pressure level when water droplets fall and collide with the water droplet receiving plate 5, the hood portion 3 of the plate-like elastic support 4 is A through hole X is provided in a portion not in contact with the top plate 32 and the water droplet receiving plate 5, and the primary natural frequency f ₀ of the vibration isolator composed of the water droplet receiving plate 5 and the elastic support 4 is set to an octave The frequency is set to be 16 Hz or more and 125 Hz or less in the band, more preferably 16 Hz or more and 63 Hz or less in the octave band.

A plate spring 60 is used as the elastic support 4 . As shown in FIGS. 6 to 8, the leaf spring 60 includes a central plate portion 62 connected to the center side of the upper surface of the top plate 32 and both left and right ends of the central plate portion 62 extending from the top plate 32 respectively. The left and right rising plate portions 63, 63 extending in the direction perpendicular to the upper surface and approaching the central plate portion 51 of the water droplet receiving plate 5, and the left and right rising plate portions 63, 63 are inclined in opposite directions from the upper ends thereof. and left and right slanted plate portions 64, 64 extending from the upper ends of the slanted plate portions 64, 64 in opposite directions to contact the lower surface 51u of the central plate portion 51 of the water droplet receiving plate 5 to contact the water droplet receiving plate. A plate having a shape provided with both left and right end plate portions 61, 61 connected to both left and right sides of the center plate portion 51 of the plate 5 was used.

That is, in the ventilation port end member 1 of the embodiment, as shown in FIG. The central plate portion 62 and the top plate 32 are connected by one or more sets of bolts 41 and nuts 42 with the center of the top plate 32 aligned with the center of the top plate 32, and the leaf spring connected to the top plate 32 Both left and right end plate portions 61 , 61 of the plate spring 60 positioned above the center plate portion 62 of the leaf spring 60 and the left and right sides of the center plate portion 51 are connected by bolts 41 and nuts 42 .
For example, a flat washer 43 and a spring washer 44 are installed between the lower surface of the top plate 32 and the nut 42 and between the lower surface of the end plate portion 61 and the nut 42 .

That is, the plate spring 60 serving as the elastic support 4 of the ventilator terminal member 1 according to the embodiment has a central plate portion 62 attached to the top plate 32 of the hood portion 3, and both left and right end plates of the leaf spring 60 are attached to the top plate 32 of the hood portion 3. The portions 61 and 61 are made of a plate material such as a metal plate attached to the water droplet receiving plate 5, and the through hole X is formed, for example, in the portion between the central plate portion 62 and the end plate portion 61 of the leaf spring 60. It is composed of a long hole (slit) with a constant width extending along the extension direction of the spring 60 .
Specifically, as shown in FIGS. 7 and 8 , the through hole X is a left through hole extending over the entire left upright plate portion 63 and inclined plate portion 64 along the extension direction of the leaf spring 60 . It is composed of a hole X and a right through-hole X extending over the entire area of the right rising plate portion 63 and the inclined plate portion 64 along the extending direction of the plate spring 60 .
Further, the left through-hole X and the right through-hole X are provided on the central side in the front-rear width direction of the rising plate portion 63 and the inclined plate portion 64 . In other words, the left through-hole X and the right through-hole X have a plate width a between the front side edge X1 of the through hole X and the front side edge 60a of the rising plate portion 63 and the inclined plate portion 64, and the through hole In order to make the plate width a between the rear side edge X2 of X and the rear side edge 60b of the rising plate portion 63 and the inclined plate portion 64 equal to each other, formed in the center.
7 and 9, reference numeral 56 denotes bolt insertion holes formed on both left and right sides of the central plate portion 51 of the water droplet receiving plate 5, and reference numeral 57 denotes the central plate of the plate spring 60 in FIGS. It is a bolt insertion hole formed in the portion 62 and the end plate portions 61 , 61 .

ここで、
ｆ_０：防振体の一次固有振動数（Ｈｚ）
ｍ：水滴受板の質量（ｋｇ）
ｋ：弾性支持体のばね定数（Ｎ／ｍ） In the ventilation port terminal member 1 of the embodiment, the primary natural frequency f ₀ of the vibration isolator composed of the water droplet receiving plate 5 and the elastic support 4 can be obtained by the following equation (2).

here,
f ₀ : primary natural frequency of vibration isolator (Hz)
m: mass of the drip tray (kg)
k: spring constant of elastic support (N/m)

In general, in order to lower the primary natural frequency _f0 of the vibration isolator described above, the spring constant of the elastic support 4 should be reduced. The body 4 becomes too soft, making it difficult to establish the vibration isolator as a structure.
Therefore, in such a case, by increasing the mass of the water droplet receiving plate 5, the primary natural frequency _f0 of the vibration isolator may be set to a target value (for example, 16 Hz or more and 63 Hz or less in the octave band). .
For example, the weight of the water droplet receiving plate 5 is increased by increasing the plate thickness of the water droplet receiving plate 5 or by adding a mass such as a weight or a reinforcing plate to the back surface (lower surface) of the water droplet receiving plate 5 . Then, the primary natural frequency _f0 of the vibration isolator may be set to a target value (for example, 16 Hz or more and 63 Hz or less in the octave band).

Experiments were conducted as follows to confirm the effect of reducing the impact sound of water droplets falling on the ventilation port terminal member 1 of the present invention.

・Experimental method An experiment was conducted in a simple anechoic chamber simulating the state in which water droplets fell on the surface (upper surface) of the center plate of the water droplet receiving plate of each specimen of the ventilation port end member attached to the air supply hole of an apartment building. .
The experimental equipment is as follows.
A box with an inner diameter of 900 mm square (a box whose interior is sound-absorbing with glass wool) was installed at the bottom of the scaffold, and a test sample of the terminal member of the ventilation port was installed outside the front center position of the box, and a register (inside ventilation mouth) was installed. The register was made of resin and was of the push type, and was in the "open" state during the experiment.
Assuming the general floor height of an apartment building, water droplets were dropped from a height of 3 m onto the surface of the central plate of the water droplet receiving plate of the terminal member of the ventilation opening using a dropper.
For the measurement of water droplet impact sound, a microphone was installed at the center position inside the box, and the ⅓ octave band sound pressure level of the water droplet impact sound was measured. The number of times water droplets fell onto the surface of the center plate of the water droplet receiving plate of each test piece was 50 times for each test piece, and the average value of the data of 40 times with little external influence was used as the measured value.

Each specimen of the vent terminal member used in the experiment, as shown in FIG.
・With damping material = Vent terminal member 1 of the embodiment
No vibration damping material = Ventilation port terminal member 1 with the vibration damping material 6 removed from the ventilation port terminal member 1 of the embodiment.
The design values for the test piece with the damping material were the weight of the water droplet receiving plate 5 = 143 g and the spring constant k of the elastic support 4 = 16.1 N/mm.
The design values for the test piece without the damping material were the weight of the water droplet receiving plate 5 = 141 g and the spring constant k of the elastic support 4 = 16.1 N/mm.
In addition, the material, dimensions, etc. of the test piece of each vent terminal member are as follows.
Common part = tube, hood, material of water droplet receiving plate = stainless steel SUS304, short side of water droplet receiving plate 5: 40 mm, long side: 150 mm, width of long edge side peripheral plate portion 52: 12 mm, long edge side peripheral plate portion 52 with a plate thickness of 1.2 mm.

・Experimental results In each test piece of the ventilation port end member used in the experiment, when water droplets collided with the surface (upper surface) of the central plate portion 51 of the water droplet receiving plate 5, the long edge side peripheral plate portion 52 radiated into the space. The eigenfrequency is in the 2 kHz band.
FIG. 10(a) shows the time-series waveform in the 2 kHz band of the sound generated when water droplets collide with the surface of the central plate portion 51 of the water droplet receiving plate 5 of the test piece without damping material.
FIG. 10(b) shows the time-series waveform in the 2 kHz band of the sound generated when water droplets collide with the surface of the center plate portion 51 of the water droplet receiving plate 5 of the test piece with damping material.
FIG. 10(c) shows the frequency analysis result of the sound generated when water droplets collide with the surface of the central plate portion 51 of the water droplet receiving plate 5 of each test sample.

As is clear from FIG. 10(a), in the case of the test piece without the damping material, the sound generated when the water droplets collided with the surface of the central plate portion 51 of the water droplet receiving plate 5 occurred after 0.5 seconds. is not completely attenuated.
On the other hand, as is clear from FIG. 10(b), in the case of the test specimen with the damping material, the sound generated when the water droplets collide with the surface of the central plate portion 51 of the water droplet receiving plate 5 lasts about 0.15 seconds. It can be seen that it is attenuated at .
That is, in the case of the test specimen with the damping material, when water droplets collide with the surface of the central plate portion 51 of the water droplet receiving plate 5, the vibration of the long edge side peripheral plate portions 52, 52 can be suppressed, and the long edge side It has been found that the vibration radiated into the space through the peripheral plate portions 52, 52 can be suppressed, and the reverberation of sound can be reduced.

In addition, as is clear from FIG. 10(c), looking at the frequency analysis results in the 2 kHz band, both specimens show a peak near 1750 Hz (see parts A and B in FIG. 10(c)). , in the case of the specimen with the damping material, compared to the specimen without the damping material, the sharpness of the peak is reduced and the sound pressure level is smaller.
That is, in the case of the test piece with the damping material, compared to the test piece without the damping material, the sound pressure of the frequency peak of the sound generated when water droplets collide with the surface of the central plate portion 51 of the water droplet receiving plate 5 It has been found that the level can also be reduced.

As is clear from the experimental results, the vibration damping material 6 is adhered to the back surfaces of the inclined surfaces of the long edge side peripheral plate portions 52, 52, and the vibration damping material 6 and the long edge side peripheral plate portion 52 are integrated. With the configuration including the water droplet receiving plate 5, when water droplets collide with the surface of the central plate portion 51 of the water droplet receiving plate 5, the vibration of the long side edge side peripheral plate portions 52, 52 can be suppressed, and the long side It has been found that since the vibration radiated into the space through the edge side peripheral plate portions 52, 52 can be suppressed, the reverberation of the sound can be reduced, and the sound pressure level of the frequency peak of the sound can also be reduced.

That is, the water droplet receiving plate 5 includes a central plate portion 51 for receiving water droplets and a peripheral plate portion provided around the central plate portion 51. The central plate portion 51 extends horizontally and has a surface for receiving water droplets. and the peripheral plate portion has an inclined surface that is inclined downward from the surface of the central plate portion 51, the vibration generated when water droplets collide with the surface of the central plate portion 51 of the water droplet receiving plate 5 is Since it is amplified at the peripheral portion of the central plate portion 51 of the water droplet receiving plate and radiated into the space via the peripheral plate portion, a long metallic sound is generated, and the sound may be felt as an unpleasant sound. there were.
Therefore, in the embodiment, the vibration damping material 6 is adhered to the back surface of the inclined surface of the long edge side peripheral plate portions 52, 52, and the vibration damping material 6 and the long edge side peripheral plate portion 52 are integrated. By suppressing the vibration of the long edge side peripheral plate portions 52, 52 when water droplets collide with the surface of the central plate portion 51 of the water droplet receiving plate 5, the long edge side peripheral plate portions 52, 52 Vibration can be suppressed and the vibration radiated into space from the long edge side peripheral plate portions 52, 52 can be reduced, so that it is possible to prevent the occurrence of a long reverberating metallic sound and reduce the sound pressure level of the frequency peak of the sound. It became so.

Further, according to the ventilation port terminal member 1 according to the embodiment, the through hole (slit) X is provided in the portion of the elastic support 4 that is not in contact with the top plate 32 of the hood portion 3 and the water droplet receiving plate 5. Therefore, it becomes a high-quality ventilation port end member that can reduce the variation in sound pressure level (standard deviation of sound pressure level measurement values) when water droplets fall and collide with the water droplet receiving plate 5 .

Further, according to the ventilation port terminal member 1 according to the embodiment, the primary natural frequency _f0 of the vibration isolator composed of the water droplet receiving plate 5 and the elastic support 4 is between 16 Hz and 125 Hz in the octave band. Since the frequency is set to be equal to the frequency, the effect of reducing the sound in the middle and high frequency band at the time of water drop collision is improved, the A characteristic sound pressure level at the time of water drop collision can be further reduced, and the water drop collision noise reduction effect is improved. It is possible to obtain the vent terminal member 1 excellent in

In the present invention, the long edge side peripheral plate portions 52, 52 of the water droplet receiving plate 5 radiate vibrations in the 1 kHz to 4 kHz band when water droplets collide with the surface of the central plate portion 51 of the water droplet receiving plate 5. , the width dimension H and the plate thickness dimension in the direction extending from the central plate portion 51 are set, and the damping material 6 is attached to the back surface of the inclined surface of the long side peripheral plate portions 52, 52 by adhesion or the like. If the damping material 6 and the long edge side peripheral plate portion 52 are integrated, the vibration of the long edge side peripheral plate portions 52, 52 in the 1 kHz to 4 kHz band can be suppressed. good.

In addition, in the ventilation port terminal member 1 of the present invention, the width dimension H of the long edge side peripheral plate portion 52 is 12 mm from the overall size, and the plate thickness dimension of the long edge side peripheral plate portion 52 is 12 mm. Since it is designed to have a thickness of 1.2 mm, when a water droplet collides with the surface of the central plate portion 51 of the water droplet receiving plate 5, the long edge side peripheral plate portions 52, 52 that radiate vibration in the octave 2 kHz band are provided. It is configured with.

As the vibration damping material 6, for example, a vibration damping material made of asphalt, a vibration damping material made of rubber, a vibration damping material made of resin, or the like is attached to the long edge side peripheral plate using an adhesive. It may be attached to the rear surface (lower surface) of the inclined surface (upper surface) of the portions 52 , 52 .

Alternatively, the damping material 6 may be adhered to the rear surface of the long edge side peripheral plate portion 52 and the rear surface of the short edge side peripheral plate portion 53, that is, almost the entire rear surface (lower surface) of the peripheral plate portion.
Also, the damping material 6 may be attached to the surface (upper surface) of the peripheral plate portion.
Alternatively, the damping material 6 may be attached to the peripheral plate portion by means other than adhesive.

Further, in the present invention, the overall shape of the vent terminal member 1 may be round.
Further, the shape of the top plate 32 of the hood portion 3 of the vent port terminal member 1 and the water droplet receiving plate 5 may not be rectangular.
For example, in the above description, a rectangular plate-shaped central plate portion 51 for receiving water droplets, and a long side edge side peripheral plate portion 52 and a short side edge side peripheral plate portion 53 provided around the central plate portion 51 are provided. Although the receiving plate 5 was exemplified, it has a central plate portion formed in a shape other than a rectangular plate shape, for example, an oval plate shape, and a peripheral plate portion provided around the central plate portion, and a vibration damping material 6 may be a ventilation port end member having a structure provided with a drip receiving plate attached to the peripheral plate portion.
Further, the ventilation port terminal member 1 may be configured such that the opening is provided not only in the lower portion of the hood portion 3 but also in the side surface and the front surface of the hood portion 3 . Moreover, the structure with which the opening was covered with a net may be used.
Also, the ventilation port terminal member 1 may be configured to be directly attached to the outer wall without providing the cylindrical portion 2 .

Further, the connection between the water droplet receiving plate 5 and the elastic support 4 and the connection between the elastic support 4 and the top plate 32 may not be by bolts and nuts. For example, they may be connected by welding, adhesive, or the like.

The through-holes X are provided in a portion of the elastic support 4 that is not in contact with the top plate 32 of the hood portion 3 and the water droplet receiving plate 5, for example, evenly in the front, rear, left, and right directions with respect to the center of the elastic support 4. The number, shape, etc. are not particularly limited.
For example, the through-holes X are a plurality of elongated holes (slits) extending along the extending direction of the plate-like elastic support 4 and arranged at predetermined intervals along the width direction of the plate-like elastic support 4. Alternatively, a plurality of long holes (slits) extending along the plate width direction of the plate-like elastic support 4 are spaced apart at predetermined intervals along the extending direction of the plate-like elastic support 4. Alternatively, a plurality of individual holes such as circular holes or rectangular holes are formed so as to line up at predetermined intervals along the extending direction of the plate-like elastic support 4. A configuration in which a plurality of individual holes such as holes or rectangular holes are randomly formed in the plate-like elastic support 4 like a punching metal may be used.

In the embodiment, the primary natural frequency _f0 of the vibration isolator composed of the water droplet receiving plate 5 and the elastic support 4 is set to a frequency of 16 Hz or more and 125 Hz or less in the octave band. However, the primary natural frequency _f0 of the vibration isolator composed of the water droplet receiving plate 5 and the elastic support 4 is not set to a frequency of 16 Hz or more and 125 Hz or less in the octave band. good too. For example, the primary natural frequency _f0 of the vibration isolator is set to a frequency slightly lower than 16 Hz of the octave band, or the primary natural frequency _f0 of the vibration isolator is set to a frequency slightly lower than 16 Hz of the octave band The frequency may be set to be slightly higher than 125 Hz.

1 vent terminal member, 3 hood portion, 4 elastic support, 5 water droplet receiving plate, 6 damping material,
32 top plate of the hood portion, 51 center plate portion, 52 long edge side peripheral plate portion (peripheral plate portion),
90 building, 91 outer wall, 92 ventilation hole, 93 outer wall.

Claims (5)

A ventilation port terminal member attached to a ventilation hole formed in an outer wall of a building,
A hood projecting from the outer wall surface of the building to the outside of the building, a water droplet receiving plate provided on the top plate of the hood via an elastic support, and a damping material,
The water droplet receiving plate is formed of a rectangular plate that receives water droplets, and is arranged so that the plate surface faces the plate surface of the rectangular top plate of the hood portion in parallel with a predetermined gap therebetween ; Peripheral plate formed by inclined plates that are provided around the central plate portion and are inclined from each side edge of the rectangular plate constituting the central plate portion to approach each side edge of the corresponding rectangular plate of the top plate of the hood portion. and
The peripheral plate portion extends from each long edge side peripheral plate portion provided to extend from each long side edge of the rectangular plate forming the central plate portion, and each short side edge of the rectangular plate forming the central plate portion. A short edge side peripheral plate portion provided as follows,
A ventilation port end member, wherein a damping material is attached to a peripheral plate portion on the long edge side . The peripheral plate part has a length dimension and a plate thickness dimension in a direction extending from the central plate part so that when a water droplet collides with the central plate part of the water droplet receiving plate, it radiates vibration in an octave band of 1 kHz to 4 kHz. ,
2. The ventilation opening terminal member according to claim 1, wherein the damping material suppresses vibration of the peripheral plate portion in a band of 1 kHz to 4 kHz. 3. The ventilation opening terminal member according to claim 1, wherein the damping material is adhered to the back surface of the inclined surface of the peripheral plate portion on the long side edge . 4. The ventilation opening terminal member according to any one of claims 1 to 3, wherein the damping material is made of rubber asphalt. A building in which the ventilation port terminal member according to any one of claims 1 to 4 is provided on the outer wall so that the hood and the water droplet receiving plate of the ventilation port terminal member protrude outward from the outer wall surface and
1. A building characterized in that the surface of the central plate portion of each water droplet receiving plate of each ventilation port terminal member provided on the outer wall of upper and lower floors of the building is positioned on a vertical line.

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