JP2020106246A - Ventilation hole terminal member and building - Google Patents

Abstract

To provide a ventilation hole terminal member and the like that can reduce an A characteristic sound pressure level at the time of drop collision of a water droplet and is excellent in reduction effect for drop collision sound of a water droplet.SOLUTION: A ventilation hole terminal member 1 is fitted to a ventilation hole that is formed in an outside wall of a building. The ventilation hole terminal member includes: a hood part 3 protruding outside the building from an outside wall surface of the building; a water droplet receiving plate 5 provided on a top plate 32 of the hood part 3 via an elastic support body 4; and a mass body X added to the water droplet receiving plate 5.SELECTED DRAWING: Figure 1

Description

The present invention relates to a ventilation port terminal member and the like having a structure in which a water drop receiving plate is provided on a top plate of a hood section via an elastic support.

Ventilation equipment is required to be installed in buildings such as multi-family housing, hotels, and office buildings. As the ventilation equipment, a ventilation port is often installed in a living room, and a ventilation port terminal member called a vent cap or the like is often installed on an outer wall of the living room.
The ventilation port terminal members are attached to the ventilation holes of the outer wall of the upper and lower floors of the building, respectively, so that the hood portion projects outward from the outer wall surface, and the ventilation port terminal members of the upper and lower floors are located on the vertical line. Often.
In the building, when a drop of water drops from the ventilation port end member on the upper floor and collides with the top plate of the hood part of the ventilation port end member on the lower floor after rain, etc. The sound of the water drop falling collision propagates into the living room as solid propagation sound.
As a ventilation port terminal member that is provided with a measure to reduce the water drop drop collision sound, for example, one having a structure in which a water drop receiving plate is provided on an upper plate of a hood portion via an elastic support is known ( See Patent Document 1).

Japanese Patent No. 5258712

However, in the ventilation port terminal member disclosed in Patent Document 1, the primary natural frequency f _{0 of the} vibration isolator composed of the elastic support and the water drop receiving plate becomes high, and the above-mentioned medium-high frequency at the time of the water drop drop collision. Since the effect of reducing the sound in the band is not sufficient, there is a problem that the A characteristic sound pressure level at the time of a water droplet drop collision cannot be reduced.
The present invention provides a ventilation port terminal member and the like that can reduce the A-characteristic sound pressure level at the time of a water drop falling collision and have an excellent effect of reducing the water drop falling collision sound.

A ventilation port terminal member according to the present invention is a ventilation port terminal member that is attached to a ventilation hole formed in an outer wall of a building, and includes a hood portion projecting to the outside of the building from an outer wall surface of the building, and a top plate of the hood portion. And a mass body attached to the water drop receiving plate, and a mass body attached to the water drop receiving plate.
In addition, the primary natural frequency f _{0 of the} vibration isolator including the water drop receiving plate, the elastic support and the mass body is set to be a frequency of 16 Hz or higher and 125 Hz or lower in the octave band. To do.
According to the ventilation port terminal member configured as described above, it is possible to reduce the A characteristic sound pressure level at the time of a water droplet drop collision, and the ventilation port terminal member has an excellent effect of reducing the water drop collision noise.
Further, the building according to the present invention is a building in which the ventilation port terminal member is provided on the outer wall so that the hood portion and the water drop receiving plate of any of the ventilation port terminal members described above project outward from the outer wall surface. As the water drop receiving plates of the ventilation port terminal members provided on the outer walls of the upper and lower floors of the building were located on the vertical line, water drops fell from the ventilation port terminal members of the upper floor and the ventilation port of the lower floor was opened. It is possible to provide a building having an excellent effect of reducing the sound of water droplet drop collision when it collides with the water droplet receiving plate of the terminal member.

The perspective view which looked at the ventilation port terminal member from the front side (Embodiment 1). The perspective view which looked at the ventilation port terminal member from the back side (Embodiment 1). The front view of the ventilation port terminal member (Embodiment 1). The rear view of a ventilation port terminal member (Embodiment 1). The figure which shows the state which water droplets drop from the upper ventilation port terminal member attached to the outer wall of the upper and lower floors of a building to the lower ventilation port terminal member (Embodiment 1). Sectional drawing which shows the structure of the vibration isolator of a ventilation port terminal member (Embodiment 1). Numerical table showing experimental results. The comparative graph which shows an experimental result. Numerical table showing experimental results The comparative graph which shows an experimental result. Graph showing the relationship between the primary natural frequency f ₀ and A-weighted sound pressure level of the vibration insulating member of each test body based on experimental results. Graph showing the relationship between the primary natural frequency f ₀ and A-weighted sound pressure level of the vibration insulating member of each test body based on experimental results. Sectional drawing which shows the structure of the vibration isolator of a ventilation port terminal member (Embodiment 2). Sectional drawing which shows the structure of the vibration isolator of a ventilation port terminal member (Embodiment 3). Sectional drawing which shows the structure of the vibration isolator of a ventilation port terminal member (Embodiment 4). Sectional drawing which shows the structure of the vibration isolator of a ventilation port terminal member (Embodiment 5). Sectional drawing which shows the structure of the vibration isolator of a ventilation port terminal member (Embodiment 6).

Embodiment 1
As shown in FIGS. 1 to 6, the ventilation port terminal member 1 according to the first embodiment has a cylindrical portion 2 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. And a hood portion 3 protruding outward from the outer wall surface 93 of the building 90, a water drop receiving plate 5 provided on the top plate 32 of the hood portion 3 via an elastic support 4, and added to the water drop receiving plate 5. The primary natural frequency f _{0 of the} vibration isolator including the water drop receiving plate 5, the elastic support 4, and the mass X is set to a frequency of 16 Hz or higher and 125 Hz or lower in the octave band. Is set to be.
The cylinder portion 2, the hood portion 3, and the water drop receiving plate 5 of the ventilation port terminal member 1 are formed of, for example, metal plates.
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 including a square front plate 31, a top plate (upper plate) 32, a left side plate 33, a right side plate 34, and a rear plate 35. An indoor side ventilation hole which is formed in a box shape and is formed in the outdoor side ventilation hole 36 (see FIG. 1) whose lower part is opened, and which is formed by opening the central side of the rectangular plate forming the rear plate 35. 37, and one end opening edge side of the tubular 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 behind the rear plate 35. The cylindrical portion 2 is formed, for example, in a cylindrical portion.
That is, in the hood part 3, the ventilation port terminal member 1 is attached to the ventilation hole 92, so that the inside of the building 90 is exposed to the outside of the building 90 via the lower outdoor ventilation hole 36 and the indoor ventilation hole 37. Alternatively, air can flow from the outside of the building 90 to the inside of the building 90.
Further, at least one of the outdoor side ventilation hole 36 and the indoor side ventilation hole 37 is formed in the gallery 38 (see FIG. 1).

In other words, the hood portion 3 has a quadrangular front plate 31, a rear plate 35 having a plate surface facing the plate surface of the front plate 31, a quadrangular upper side of the front plate 31 and a quadrangular shape of the rear plate 35. A top plate 32 connecting the upper side, a left side plate 33 connecting the left side of the quadrangle extending downward from one end of the upper side of the quadrangle of the front plate 31 and the left side extending below one end of the upper side of the quadrangle of the rear plate 35, A right side plate 34 that connects a right side of a quadrangle extending downward from the other end of the quadrangle of the front plate 31 and a right side extending downward from the other end of the quadrangle of the quadrangle of the rear plate 35, and a ventilation port terminal member. When 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. It is configured to communicate with the inside of the room through the ventilation holes 37 on the inside of the rear plate 35.

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

Further, on the lower end side of the rear plate 35 of the hood portion 3, a water drainer for receiving water flowing along the plate surface of the hood portion 3 and flowing the received water to the front side of the outer wall surface 93 separated from the outer wall surface 93. The unit 39 is provided.
The draining part 39 projects from, for example, an inner plate 39a formed by a portion of the rear plate 35 of the hood portion 3 that projects below the outdoor ventilation holes 36, and left and right side edges on the lower end side of the inner plate 39a. The protruding pieces 39b, 39b, the lower end of the inner plate 39a and the inclined pieces 39c inclined forward and downward from the lower ends of the left and right protruding pieces 39b, 39b, and rising up from the left and right side edges of the inclined piece 39c. This is a configuration including the left and right restricting pieces 39d and 39d provided.
Since the water drain 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 are attached to the ventilation holes 92 on the lower floor. Since it drops onto the water droplet receiving plate 5 of the mouth end member 1, it is possible to prevent water droplets from flowing down along the outer wall surface 93 and to prevent water marks on the outer wall surface 93.

The water drop receiving plate 5 provided on the top plate 32 of the hood part 3 via the elastic support body 4 is configured by a roof-shaped plate material arranged so as to cover the top plate 32 of the hood part 3. ..
As shown in FIG. 1, for example, the upper surface of the water drop receiving plate 5 is formed into a roof shape in which the top of the ridge is a similar rectangular flat surface that is slightly smaller than the rectangle of the top plate 32 of the hood 3. To be done.
In other words, the water drop receiving plate 5 is formed of, for example, a rectangular plate that is slightly smaller than the rectangular shape of the top plate 32 of the hood portion 3 and has a plate surface that is a predetermined plane with the plate surface of the top plate 32 of the hood portion 3. A central plate portion 51 arranged to face each other in parallel at a distance, and each rectangular side edge of the central plate portion 51 approaches each rectangular side edge of the top plate 32 of the corresponding hood portion 3. And the peripheral plate portions 52, 52 formed by the inclined plates.
The water drop receiving plate 5 has a rectangular center 5</b>C that constitutes the central plate portion 51 on a vertical line V that is orthogonal to the plate surface of the top plate 32 of the hood part 3 and passes through the center of the rectangle of the top plate 32. Is provided on the top plate 32 of the hood portion 3 via the elastic support body 4 so as to be located at.

Then, as shown in FIG. 5, on the outer walls 91, 91 of the upper and lower floors, the hood portion 3 and the water drop receiving plate 5 of the ventilation port terminal member 1 are projected to the outside of the outer wall surface 93, respectively. 1 is provided, and the center 5C, 5C of each water drop receiving plate 5, 5 of each ventilation port terminal member 1, 1 is located on the vertical line V to form a building 90.
In the building 90, water flowing along the plate surface of the hood portion 3 of the ventilation port terminal member 1 attached to the upper floor to the water draining portion 39 passes through the front end of the inclined piece 39c of the water draining portion 39 to the lower floor. It falls on the water drop receiving plate 5 of the ventilation port terminal member 1 attached to the.

Then, in order to reduce the A characteristic sound pressure level at the time of the collision of the water drop falling on the water drop receiving plate 5, in the ventilation port terminal member 1 according to the first embodiment, the elastic support 4 is provided on the top plate 32 of the hood portion 3. The water drop receiving plate 5 is provided via the water drop receiving plate 5 and the mass body X is added to the water drop receiving plate 5, and the primary characteristic of the vibration isolator is composed of the water drop receiving plate 5, the elastic support 4, and the mass body X. The frequency f ₀ is set to a frequency of 16 Hz or more in the octave band and 125 Hz or less, more preferably a frequency of 16 Hz or more in the octave band and 63 Hz or less.

As the elastic support body 4, a leaf spring 60 was used. As shown in FIG. 6, the leaf spring 60 includes a central plate portion 62 connected to the central side of the upper surface of the top plate 32, and right and left end portions of the central plate portion 62 that are orthogonal to the upper surface of the top plate 32, respectively. Then, the left and right rising plate parts 63, 63 extending in a direction approaching the central plate part 51 of the water drop receiving plate 5 and the upper ends of the left and right rising plate parts 63, 63 are respectively extended so as to rise in opposite directions and incline. The left and right inclined plate portions 64, 64 extending in opposite directions from the upper ends of the inclined plate portions 64, 64, respectively, and contacting the lower surface 51u of the central plate portion 51 of the water droplet receiving plate 5, A shape having both left and right end plate portions 61, 61 connected to both left and right sides of the central plate portion 51 was used.

That is, in the ventilation port terminal member 1 of the first embodiment, as shown in FIG. 6, the elastic support body 4 is constituted by the leaf spring 60 as a spring, and the center of the central plate portion 62 of the leaf spring 60 and the top plate are The center plate portion 62 and the top plate 32 are connected by one or more sets of bolts 41 and nuts 42 in a state where the center of the upper surface of 32 is aligned, and the center of the leaf spring 60 connected to the top plate 32. The left and right end plate portions 61, 61 of the leaf spring 60 positioned above the plate portion 62 and the left and right sides of the central plate portion 51 are connected by bolts 41 and nuts 42.
In addition, 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.

The mass body X is formed of, for example, a weight, a reinforcing plate, or the like, and is connected to the water drop receiving plate 5 by a connecting means such as a screw, a rivet, welding, an adhesive, or an adhesive tape (not shown) so that the water drop receiving plate 5 does not easily come off. 5 and, for example, to the center side of the lower surface 51u of the central plate portion 51 of the water drop receiving plate 5.
For example, a through hole is provided in the center of the central plate portion 51 of the water drop receiving plate 5, a through hole that penetrates the upper and lower surfaces of the mass body X is provided, and after bolts are inserted into these through holes, The water drop receiving plate 5 and the mass body X may be coupled by screwing and fastening a nut from the tip side.

ここで、
ｆ_０：防振体の一次固有振動数（Ｈｚ）
ｍ：水滴受板側（＝水滴受板５＋質量体Ｘ）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 Embodiment 1 and each of the embodiments described later, the primary natural frequency f ₀ of the vibration isolator including the water drop receiving plate 5, the elastic support body 4, and the mass body X is as follows. It can be obtained by the equation (1).

here,
f ₀ : Primary natural frequency (Hz) of the vibration isolator
m: Mass (kg) of the water drop receiving plate side (=water drop receiving plate 5+mass body X)
k: Spring constant of elastic support (N/m)

Generally, in order to lower the primary natural frequency f ₀ of the vibration isolator described above, the spring constant of the elastic support 4 may be reduced, but if the spring constant of the elastic support 4 is too low, the elastic support 4 is elastically supported. The body 4 becomes too soft, and it becomes difficult to establish the vibration isolator as a structure.
Therefore, in the present invention, the primary natural frequency of the vibration isolator is increased by adding the mass X to the water drop receiving plate 5 to increase the mass of the water drop receiving plate 5 without changing the spring constant of the elastic support 4. Attention was paid to lowering f ₀ .

An experiment for confirming the water drop falling collision noise reduction effect of the ventilation port terminal member 1 of the present invention was conducted as follows.

-Experimental method An experiment was conducted in a simple anechoic chamber to simulate the situation in which water drops fell on each test piece of the ventilation port end member attached to the air supply hole of the apartment house.
The experimental equipment is as follows.
A box with an inner diameter of 900 mm square (a box with sound absorption treated with glass wool inside) was installed at the bottom of the scaffold, and a test piece of ventilation port end member was installed outside the center of the front of the box, and a register (inside ventilation) Mouth) was installed. The register was a push type made of resin, and was in the "open" state during the experiment.
Assuming the general floor height of an apartment building, a dropper was used to drop a drop of water from the position at a height of 3 m at the top of the test body of the ventilation end member.
For the measurement of the water drop drop collision sound, a microphone was installed at the center position inside the box, and the A characteristic sound pressure level of the water drop drop collision sound was measured. The number of drops of water drops was 50 times for one test body, and the average value of the data of 40 times with little influence from the outside was used as the measured value.

-Ventilation port end member specimens The design values for the ventilation end member specimens used in the experiment are shown in Figures 7 and 9.
That is, in FIG. 7 and FIG.
(A) No countermeasures=Ventilation port terminal member configured not to have a water drop receiving plate on the top plate.
(B) Patent Document 1=Ventilation port terminal member having the configuration disclosed in Patent Document 1 (spring constant k of the vibration isolator k=248.8 N/mm, primary natural frequency f ₀ =300 Hz of the vibration isolator).
(C) αg (mass of water drop receiving plate α=52 g, 136 g, 112 g)+0 g=ventilation port terminal member having a configuration in which the mass body X is removed from the ventilation port terminal member 1 of the first embodiment (hereinafter, “no mass body”) That).
(D) αg (mass of water drop receiving plate α=52 g, 136 g, 112 g)+βg (mass X of mass X=26 g, 52 g, 78 g, 104 g)=the ventilation port terminal member 1 of the first embodiment (hereinafter, “mass”) There is a body").
Further, in each of the test bodies (c) without mass body and (d) with mass body, the spring constant k of the elastic support is k=2.4 N/mm, k=4.3 N/mm, k= The measurement was performed by using the one having 8.3 N/mm and k=4.9 N/mm.
Further, the measurement was performed using a test body in which the inner diameter (φ) of the tubular portion was 100 mm and a test body in which the inner diameter (φ) of the tubular portion was 150 mm.

The material, dimensions, etc. of the test piece of each ventilation port end member are as follows.
Common part=Cylinder part, hood part, water drop receiving plate material=stainless steel SUS304, water drop receiving plate short side 43 mm, long side 150 mm.
For the test piece having an inner diameter (φ) of 100 mm, the water drop receiving plate has a plate thickness of 1.0 mm, the water drop receiving plate has a mass of 52 g, or the water drop receiving plate has a plate thickness of 2.5 mm and the water drop receiving plate has a mass of 136 g.
For the test body having an inner diameter (φ) of 150 mm, the thickness of the water drop receiving plate was 1.0 mm and the mass of the water drop receiving plate was 112 g.

-Experimental results Figs. 7 to 12 show measurement results of the A characteristic sound pressure level of each test body of the ventilation port terminal member described above.
7 and 8 show the measurement results of the A characteristic sound pressure level in the case of using a test body having an inner diameter (φ) of 100 mm as the ventilation port terminal member of each test body.
FIG. 9 and FIG. 10 show the measurement results of the A characteristic sound pressure level when a test body having an inner diameter (φ) of the tubular portion of 150 mm is used as the ventilation port end member of each test body.
Further, FIG. 11 shows the primary natural frequency f ₀ and the A characteristic sound of the vibration isolator of each test body when the test body having the cylindrical inner diameter (φ) of 100 mm is used as the ventilation port end member of each test body. The relationship with the pressure level is shown.
FIG. 12 shows the primary natural frequency f ₀ and the A-characteristic sound pressure level of the vibration isolator of each test body when the test body whose inner diameter (φ) of the tubular portion is 150 mm is used as the ventilation end member of each test body. Shows the relationship with.

Comparing the measurement results of the test bodies in which the inner diameter (φ) of the tubular portion is 100 mm, the A characteristic sound is obtained in the test body without the countermeasure and without the mass body and with the mass body as compared with the test body of Patent Document 1. It can be seen that the pressure level is low and the effect of reducing the collision noise of water drops is excellent.
Further, comparing the test body without the mass body and the test body with the mass body, it can be seen that the test body with the mass body has a lower A-characteristic sound pressure level and is excellent in the effect of reducing the water drop collision noise. ..
Also, in the measurement results of each test body having an inner diameter (φ) of the tubular portion of 150 mm, similarly, in the test body with the mass body, the A characteristic sound pressure level is lower than that of the other test bodies, and the water drop is dropped. It can be seen that the impact noise reduction effect is excellent.
Further, as is clear from FIGS. 11 and 12, it is understood that the A characteristic sound pressure level can be lowered when the primary natural frequency f ₀ of the vibration isolator is lowered.

In addition, when the plate thickness of the water drop receiving plate is increased to increase the mass of the water drop receiving plate itself, that is, in the case of the test body in which the mass of the water drop receiving plate is 136 g, the primary natural frequency f _{0 of the} vibration isolator is Since it becomes low, the effect of reducing the sound in the middle and high frequency bands at the time of a water drop drop collision is improved, and the A characteristic sound pressure level at the time of a water drop drop collision becomes low. However, in this case, it is necessary to increase the thickness of the water drop receiving plate, which causes a problem that the material cost of the water drop receiving plate increases.
On the other hand, if the mass body X is added to the water drop receiving plate as in the first embodiment, the thickness of the water drop receiving plate can be reduced to reduce the material cost of the water drop receiving plate, and the water drop dropping collision It is possible to obtain a ventilation port terminal member that has a low A characteristic sound pressure level at that time and that is excellent in the effect of reducing the sound of water drop collision.

As is apparent from the above, according to the ventilation port terminal member 1 according to the first embodiment, the ventilation port terminal member 1 is provided on the tubular portion 2, the hood portion 3, and the top plate 32 of the hood portion 3 via the elastic support body 4. Since the water drop receiving plate 5 and the mass body X attached to the water drop receiving plate 5 are provided, the spring constant of the elastic support 4 can be prevented from becoming too small, and the vibration isolator can be used as a structural body. In addition, it is possible to provide the ventilation port terminal member 1 that can reduce the A characteristic sound pressure level at the time of a water drop collision and is excellent in reducing the water drop collision noise.
Further, according to the ventilation port terminal member 1 according to the first embodiment, the primary natural frequency f ₀ of the vibration isolator including the water drop receiving plate 5, the elastic support body 4, and the mass body X is 16 Hz of the octave band. Since the frequency is set to 125 Hz or less in the above, the effect of reducing the sound in the middle and high frequency bands at the time of a water droplet drop collision is improved, and the A characteristic sound pressure level at the time of a water droplet drop collision can be further reduced, resulting in a water droplet drop. It is possible to obtain the ventilation port terminal member 1 having an excellent effect of reducing the collision noise.

Embodiment 2
As shown in FIG. 13, in the ventilation port terminal member 1 of the second embodiment, the elastic support body 4 is configured by a leaf spring 60 as a spring, and the leaf spring 60 corresponds to the central plate portion 51 of the water drop receiving plate 5. The central plate portion 62 which is in contact with the lower surface 51u and is connected to the central side of the central plate portion 51, and the left and right ends of the central plate portion 62 are respectively orthogonal to the lower surface 51u of the central plate portion 51 to the top plate 32. Left and right falling plate portions 63, 63 extending in the approaching direction, and left and right inclined plate portions 64, 64 extending downwardly and inclining in opposite directions from the lower ends of the left and right falling plate portions 63, 63, respectively. A shape having both left and right end plate portions 61, 61 extending in opposite directions from the lower ends of the inclined plate portions 64, 64 and contacting the upper surface of the top plate 32 and connected to the top plate 32. Was used. That is, the leaf spring 60 described in the ventilation port terminal member 1 of the first embodiment is used upside down.

In the ventilation port terminal member 1 of the second embodiment, for example, as shown in FIG. 13, both left and right end plate portions 61, 61 of the leaf spring 60 are connected to the top plate 32 of the hood portion 3 by bolts 41 and nuts 42. At the same time, the central plate portion 62 of the leaf spring 60 and the central plate portion 51 of the water drop receiving plate 5 located above the left and right end plate portions 61, 61 of the plate spring 60 connected to the top plate 32 are 1 The bolts 41 and the nuts 42 of a set or more are connected to each other.
In addition, 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 central plate portion 62 and the nut 42.

In addition, in the ventilation port terminal member 1 according to the second embodiment, mass bodies X and X are added to the left and right sides of the lower surface 51u of the central plate portion 51 of the water drop receiving plate 5, respectively, and the leaf spring 60 and the water drop receiving plate are formed. 5 and the mass X, the primary natural frequency f ₀ of the vibration proof body is 16 Hz or more in the octave band and 125 Hz or less, more preferably 63 Hz or more in the octave band 16 Hz or more. The frequency was set as follows.

Embodiment 3
As shown in FIG. 14, in the ventilation port terminal member 1 of the third embodiment, the elastic support body 4 is configured by a plurality of leaf springs 60A and 60B as springs, and the plurality of leaf springs 60A and 60B and the water drop receiving plate. 5 and the mass X, the primary natural frequency f ₀ of the vibration isolator is 16 Hz or higher in the octave band and 125 Hz or lower, more preferably 16 Hz or higher in the octave band and 63 Hz or lower. The frequency was set.

The leaf spring 60A includes both left and right end plate portions 61A and 61A that are in contact with the upper surface of the top plate 32 and are connected to the top plate 32, and a curved plate portion 62A that connects the left and right end plate portions 61A and 61A. The shape provided was used.
Further, the leaf spring 60B is in contact with the lower surface 51u of the central plate portion 51 of the water drop receiving plate 5 and is connected to the central plate portion 51 on both left and right end plate portions 61B and 61B, and both left and right end plate portions 61B and 61B. A shape having a curved plate portion 62B connecting between 61B was used.

In the ventilation port terminal member 1 of the third embodiment, as shown in FIG. 14, for example, the left and right end plate portions 61A and 61A of one leaf spring 60A are connected to the left and right sides of the top plate 32 by bolts 41 and nuts 42. In addition, the left and right end plate portions 61B, 61B of the other leaf spring 60B are connected to the left and right sides of the central plate portion 51 of the water drop receiving plate 5 by bolts 41 and nuts 42, and the left and right sides of the one leaf spring 60A are connected. It is located below both end plate parts 61A and 61A, and is located below the center part of the curved plate part 62A of one plate spring 60A and the left and right end plate parts 61B and 61B of the other plate spring 60B. The center of the curved plate portion 62B of the other leaf spring 60B is connected by the bolt 41 and the nut 42.
Then, the mass body X is added to, for example, the central side of the lower surface 51u of the central plate portion 51 of the water drop receiving plate 5.
In addition, between the lower surface of the top plate 32 and the nut 42, between the lower surface of the end plate portion 61B of the other leaf spring 60B and the nut 42, and between the lower surface of the curved plate portion 62A of the one leaf spring 60A and the nut 42. For example, a plain washer 43 and a spring washer 44 are installed between the flat washer 42 and the spring 42.

Embodiment 4
As shown in FIG. 15, in the ventilation port terminal member 1 of the fourth embodiment, the elastic support body 4 is configured by a coil spring (compression coil spring) 60C as a spring and a support shaft 46, and is supported by the coil spring 60C. More preferably, the primary natural frequency f ₀ of the vibration proof body composed of the shaft 46, the water drop receiving plate 5 and the mass body X is set to a frequency of 16 Hz or higher in the octave band and 125 Hz or lower. The frequency was set to 16 Hz or higher and 63 Hz or lower.
The mass body X is added to the central side of the lower surface 51u of the central plate portion 51 of the water drop receiving plate 5, for example.

The coil spring 60C includes a left coil spring 60C disposed on the left end side of the central plate portion 51 of the water drop receiving plate 5 and a right coil spring disposed on the right end side of the central plate portion 51 of the water drop receiving plate 5. 60C was used.

In the ventilation port terminal member 1 of the fourth embodiment, as shown in FIG. 15, for example, the one end 61C side of the coil spring 60C is in contact with the upper surface of the top plate 32 or is connected to the top plate 32, and at the same time, the coil spring is The other end 62C side of 60C is in contact with the lower surface of the water drop receiving plate 5 or is connected to the water drop receiving plate 5.

Specifically, as shown in FIG. 15, support shafts 46, 46 are provided on the left and right sides of the lower surface 51u of the central plate portion 51 of the water drop receiving plate 5 so as to project from the lower surface 51u. That is, the other end 46a of the support shaft 46 is attached to the lower surface 51u of the central plate portion 51 of the water drop receiving plate 5 by a fixing means such as welding.
Further, on the top plate 32 of the hood portion 3, shaft through holes 47 for penetrating the support shaft 46 are formed at positions where the one ends 61C of the coil springs 60C are arranged.

In the ventilation port terminal member 1 of the fourth embodiment, the support shaft 46 fixed to the lower surface 51u of the central plate portion 51 of the water drop receiving plate 5 is attached to the hollow portion of the coil spring 60C from the other end 62C side of the coil spring 60C. And the one end 46b side of the support shaft 46 is projected downward from the lower surface of the top plate 32 through the shaft through hole 47 of the top plate 32, and the shaft stop member 48 is attached to the one end 46b side of the support shaft 46. The other end 62C of the coil spring 60C is configured to be in contact with the lower surface 51u of the central plate portion 51 of the water drop receiving plate 5, and the one end 61C of the coil spring 60C is configured to be in contact with the upper surface of the top plate 32. It

Further, in the fourth embodiment, the elastic support body 4 connects the other end 62C of the coil spring 60C and the lower surface of the central plate portion 51 of the water drop receiving plate 5 by a fixing means such as welding or adhesion, and at the same time, The end 61C and the upper surface of the top plate 32 may be connected by a fixing means such as welding or adhesion.

Further, although not shown, in the fourth embodiment, the elastic support body 4 does not include the support shaft 46, and, for example, the other end 62C of the coil spring 60C and the lower surface of the central plate portion 51 of the water drop receiving plate 5 are welded, Alternatively, the coil spring 60C may be connected by fixing means such as adhesion, and the one end 61C of the coil spring 60C and the upper surface of the top plate 32 may be connected by fixing means such as welding or adhesion.

That is, in the ventilation port terminal member 1 of the fourth embodiment, the elastic support body 4 is configured by the coil spring (compression coil spring) 60C as a spring, and is configured by the coil spring 60C, the water drop receiving plate 5, and the mass body X. The first natural frequency f ₀ of the vibration isolator is set to a frequency of 16 Hz or more in the octave band and 125 Hz or less, more preferably a frequency of 16 Hz or more in the octave band and 63 Hz or less. Good.

Embodiment 5
As shown in FIG. 16, in the ventilation port terminal member 1 of the fifth embodiment, the elastic support body 4 is configured by the rubber 70 and the leaf spring 60 of the first embodiment (see FIG. 6). 70, the water drop receiving plate 5, and the mass X, the primary natural frequency f ₀ of the vibration proof body is more preferably 16 Hz of the octave band so that it becomes a frequency of 16 Hz or more of the octave band and 125 Hz or less. With the above, the frequency is set to 63 Hz or less.
The mass body X is added to the central side of the lower surface 51u of the central plate portion 51 of the water drop receiving plate 5, for example.

In the ventilation port terminal member 1 of the fifth embodiment, as shown in FIG. 16, for example, the central plate portion 62 of the leaf spring 60 is connected to the central portion of the top plate 32 via the rubber 70 by the bolt 41 and the nut 42. , The left and right end plate portions 61, 61 of the leaf spring 60 positioned above the central plate portion 62 of the leaf spring 60 connected to the top plate 32, and the left and right sides of the central plate portion 51 of the water drop receiving plate 5. Is connected by a bolt 41 and a nut 42.
A flat washer 43 and a spring washer 44 are installed between the lower surface of the end plate portion 61 and the nut 42, for example.

The rubber connecting portion 7 between the central plate portion 62 of the leaf spring 60 and the top plate 32 of the hood portion 3 is specifically configured as follows.
The central plate portion 62 of the leaf spring 60 has a bolt through hole through which the bolt 41 penetrates.
Further, the rubber 70 has a cylindrical shape in which a mounting hole 73 for mounting the metal cylinder 45 is formed in the center, and a ring-shaped groove 71 is formed on the outer peripheral surface to encircle the outer peripheral surface. Is.
Further, in the top plate 32 of the hood portion 3, a fitting through hole 72 into which the cylindrical rubber 70 is fitted is formed at a position where the central plate portion 62 of the leaf spring 60 is connected.

The metal cylinder 45 is previously mounted in the mounting hole 73 of the rubber 70, and the hole edge of the fitting through hole 72 formed in the top plate 32 of the hood portion 3 is a ring-shaped groove of the rubber 70 having a cylindrical shape. The rubber 70 is attached to the fitting through hole 72 so as to fit into the fitting 71.
Then, the central plate portion 62 of the leaf spring 60 is placed on the top plate so that the bolt through hole formed in the central plate portion 62 of the leaf spring 60 and the cylindrical hole of the metal cylinder 45 mounted inside the rubber 70 are aligned with each other. It is installed on one end surface of the rubber 70 projecting upward from the upper surface of 32, and the bolt 41 is passed through the bolt through hole of the central plate portion 62 of the plate spring 60 and the cylindrical hole of the metal cylinder 45 so that the tip side of the bolt 41 is raised. The rubber 70 protruding downward from the lower surface of the plate 32 is caused to protrude downward from the other end surface.
Then, the nut 42 is fastened to the tip end side of the bolt 41 protruding downward from the other end surface of the rubber 70, for example, via the flat washer 43 and the spring washer 44, so that the central plate portion 62 of the leaf spring 60 and the top plate. A rubber connecting portion 7 having a structure in which 32 and 32 are connected via a rubber 70 by a bolt 41 and a nut 42 is configured.
It should be noted that, as shown in FIG. 14, one or more sets of rubber connecting portions 7 for connecting the central plate portion 62 of the leaf spring 60 and the top plate 32 are provided.

Further, although not shown, in the fifth embodiment, the elastic support body 4 is configured such that at least one of the end plate portion 61 side and the central plate portion 62 of the leaf spring 60 is connected by the rubber connecting portion 7. Good. For example, in the elastic support body 4 of the fifth embodiment, the left and right end plate portions 61, 61 of the leaf spring 60 are connected to the water drop receiving plate 5 via the rubber connecting portion 7, and the central plate portion of the leaf spring 60 is also included. The configuration may be such that 62 is connected to the top plate 32 via the rubber connecting portion 7.

That is, as shown in FIG. 16, the ventilation port terminal member 1 of the fifth embodiment is the same as the leaf spring 60 of the first embodiment, and the center plate portion 62 of the leaf spring 60 and the center of the top plate 32 are used. The connecting portion with the side is constituted by one or more sets of rubber connecting portions 7.
Note that the configuration of the parts not particularly described in FIG. 16 is the same as the configuration of the first embodiment (FIG. 6).

Embodiment 6
As shown in FIG. 17, the ventilation port terminal member 1 of the sixth embodiment has the same elastic support 4 as the leaf spring 60 shown in the first embodiment (see FIG. 6) or the fifth embodiment (see FIG. 16). A rubber plate 600 as a rubber having a spring shape and having a spring shape, and the primary natural frequency f ₀ of the vibration isolator composed of the rubber plate 600, the water drop receiving plate 5 and the mass X is The frequency is set to be 16 Hz or higher in the octave band and 125 Hz or lower, and more preferably 16 Hz or higher in the octave band and 63 Hz or lower.
The mass body X is added to the central side of the lower surface 51u of the central plate portion 51 of the water drop receiving plate 5, for example.

The rubber plate 600 extends from the left and right ends of the center plate 602 connected to the top plate 32 of the hood part 3 in a direction orthogonal to the top plate 32 and close to the water drop receiving plate 5. From the upper ends of the left and right rising plate portions 603 and 603, the left and right rising plate portions 603 and 603, and the left and right inclined plate portions 604 and 604, which rise and extend in mutually opposite directions, respectively. A shape having a pair of left and right end plate portions 601 and 601 connected to the water drop receiving plate 5 respectively extending in opposite directions was used.

That is, in the ventilation port terminal member 1 of the sixth embodiment, as shown in FIG. 17, the left and right end plate portions 601 and 601 of the rubber plate 600 are attached to the left and right sides of the central plate portion 51 of the water drop receiving plate 5 by the bolts 41 and The central plate portion 602, which is connected to the central plate portion 51 and is located below the left and right end plate portions 601 and 601, which are connected to the right and left sides of the central plate portion 51, has a bolt 41 and a nut on the central side of the top plate 32. It is configured to be connected by 42.
In addition, 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 601 and the nut 42.

According to the ventilation port terminal member 1 of each of the second to sixth embodiments, the elastic support member 4 is replaced by a spring (a leaf spring 60, a combination of the leaf springs 60A and 60B, a coil spring 60C), or a spring and a rubber. 70 or a rubber plate (rubber) 600, and the primary natural frequency f ₀ of the vibration isolator composed of the elastic support 4, the water drop receiving plate 5 and the mass X is set to 16 Hz or more of the octave band. The frequency is set to 125 Hz or less, and more preferably set to a frequency of 16 Hz or more in the octave band and 63 Hz or less. The spring constant can be prevented from becoming too small, the vibration isolator can be realized as a structure, and the A characteristic sound pressure level at the time of a water drop drop collision can be reduced, which is excellent in the effect of reducing the water drop collision sound. It becomes the ventilation port terminal member 1.

That is, according to the ventilation port terminal member 1 of each of the first to sixth embodiments, the vibration transmissibility becomes a vibration isolation region of 1 or less in the frequency band higher than the frequency corresponding to √2 times the primary natural frequency f ₀ . The vibration transmission from the water drop receiving plate 5 to the hood part 3 is suppressed, and the propagation of the vibration energy generated by the drop collision of the water drops to the hood part 3 can be suppressed.

Further, the frequency band around the primary natural frequency f ₀ is a vibration amplification region, and by adopting the structure of the vibration isolator shown in each of the first to sixth embodiments, the primary natural vibration of the vibration isolator is adopted. Although the amplification factor of the resonance point of the number f ₀ is large, the frequency band in the vicinity of the primary natural frequency f ₀ is a region in which the correction amount in the frequency correction A characteristic is large, and therefore the sound pressure level felt by a person is low. It becomes a value.

Further, in the case where the elastic support body 4 is provided with the rubber connecting portion 7 like the ventilation port terminal member 1 shown in the fifth embodiment (see FIG. 16 ), the damping effect of the rubber 70 of the rubber connecting portion 7 is obtained. As a result, the effect of reducing the amplification factor of the resonance point of the vibration isolator is added, so that it is possible to obtain the ventilation port terminal member 1 in which the adverse effect of the resonance point is suppressed and the effect of reducing the water drop drop collision sound is improved.

Further, according to the ventilation port terminal member 1 according to the sixth embodiment (see FIG. 17 ), since the elastic support body 4 is composed of the rubber plate 600 formed to have a spring function, the damping effect of rubber is obtained. Since it can be provided, the effect of lowering the amplification factor of the resonance point of the vibration isolator is given, and the ventilation port terminal member 1 can be obtained in which the adverse effect of the resonance point is suppressed and the effect of reducing the water drop collision sound is improved. it can.

Further, according to the present invention, the ventilation port terminal member 1 is provided on the outer wall 91 so that the hood portion 3 and the water drop receiving plate 5 of the ventilation port terminal member 1 described above project outward from the outer wall surface 93, and The water drop receiving plates 5, 5 of the ventilation port terminal members 1, 1 provided on the outer wall 91 of the floor construct the building 90 positioned on the vertical line V, thereby forming the ventilation port terminal of the upper floor. It is possible to provide the building 90 that is excellent in the effect of reducing the sound of water droplet drop collision that occurs when the water droplet W drops from the member 1 and collides with the water droplet receiving plate 5 of the ventilation port terminal member 1 on the lower floor.

The overall shape of the ventilation port terminal member 1 may be round.
Further, the shapes of the top plate 32 and the water drop receiving plate 5 of the hood portion 3 of the ventilation port terminal member 1 do not have to be rectangular.
Further, the ventilation port terminal member 1 may have a configuration in which the opening is provided not only on the lower portion of the hood portion 3 but also on the side surface and the front surface of the hood portion 3. Further, the opening may be covered with a net.

Further, the ventilation port terminal member 1 may be configured so as to be directly attached to the outer wall without including the tubular portion 2.

Further, the connection between the water drop receiving plate 5 and the elastic support 4 and the connection between the elastic support 4 and the top plate 32 do not have to be connection by bolts and nuts. For example, it may be configured to be connected by welding, an adhesive, or the like.

The forms of the elastic support 4 and the water drop receiving plate 5 are not particularly limited.

In each embodiment, the mass body X is added to the lower surface 51u of the water drop receiving plate 5, but the mass body X may be added to the upper surface or the end surface of the water drop receiving plate 5. That is, it suffices that the mass body X is provided so as to project from the plate surface or the end surface of the water drop receiving plate 5.

Further, the mass body X may be added to the elastic support body 4.

The mass body X may be made of any material.
The number of mass bodies X may be one or more.

Further, in each of the embodiments, the primary natural frequency f _{0 of the} vibration isolator including the water drop receiving plate 5, the elastic support 4 and the mass X is set to a frequency of 16 Hz or higher and 125 Hz or lower in the octave band. However, the primary natural frequency f _{0 of the} vibration isolator composed of the water drop receiving plate 5, the elastic support 4 and the mass X is not less than 125 Hz and not more than 16 Hz in the octave band. Does not have to be set. For example, the primary natural frequency f _{0 of the} vibration isolator is set to be a frequency slightly lower than 16 Hz of the octave band, or the primary natural frequency f ₀ of the vibration isolator is set to the octave band. The frequency may be set to be slightly higher than 125 Hz.

1 ventilation port terminal member, 3 hood part, 4 elastic support, 5 water drop receiving plate,
32 Hood top plate, 90 building, 91 outer wall, 92 ventilation hole, 93 outer wall surface,
X mass.

Claims (3)

A ventilation port terminal member attached to a ventilation hole formed on an outer wall of a building,
A hood portion protruding from the outer wall surface of the building to the outside of the building, a water drop receiving plate provided on the top plate of the hood portion via an elastic support, and a mass body added to the water drop receiving plate A ventilation port terminal member characterized by the above. The primary natural frequency f _{0 of the} vibration isolator constituted by the water drop receiving plate, the elastic support and the mass body is set to be a frequency of 16 Hz or higher and 125 Hz or lower in the octave band. The ventilation port terminal member according to Item 1. A building in which the ventilation port terminal member is provided on the outer wall so that the hood portion and the water drop receiving plate of the ventilation port terminal member according to any one of claims 1 and 2 project outward from the outer wall surface. And
A building characterized in that each water drop receiving plate of each ventilation port terminal member provided on the outer wall of the upper and lower floors of the building is positioned on a vertical line.

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