JP6849474B2 - Background noise generator - Google Patents

Description

The present invention relates to a background noise generator that generates the room background noise for living sound from outside.

In recent condominiums and other condominiums, the level of sound incident from the outside of the building to the inside of the building has decreased due to high heat insulation and high airtightness. It may be the first half.
In addition, a 24-hour ventilation system, which is required by the Building Standards Law to continuously ventilate the inside of a building by mechanical ventilation, is known in order to provide sufficient ventilation inside a building with high heat insulation and high airtightness. See Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 2002-39579 Japanese Unexamined Patent Publication No. 2007-101077

In an environment where the level of sound incident from the outside of the building to the inside of the building is low as described above, there is a problem that people are worried about hearing living sounds such as walking sounds, door opening / closing sounds, and drainage sounds from the outside indoors. Is occurring.
In particular, as a 24-hour ventilation system, in a building that adopts a type 3 ventilation system in which the air supply is natural air supply and forced exhaust is performed using an exhaust fan for exhaust, the sound incident on the room from the outside of the building is heard. As the level becomes smaller, it tends to be easier to hear the living sounds from the outside.
The present invention is to provide a dark noise generator for realizing a hardly indoor environment heard live sound from outside. The "living sound from the outside" refers to the living sound from the upper floors of the condominium and other neighboring houses, the living sound from the adjacent house in the detached building, and the like.

The background noise generator according to the present invention includes an air supply hole provided in the building for communicating the outside and the inside of the building, an exhaust means using an exhaust fan for exhausting the air inside the building to the outside of the building, and an exhaust means. It is provided inside the air supply hole and has a resistance portion that acts as a resistance when air passes through the inside of the air supply hole. The resistance portion is a cylindrical body formed with an outer diameter corresponding to the inner diameter of the air supply hole having a circular cross section. And the external resistance plate attached to the inner surface of the opening side of the cylinder located on the outer side of the building, and the indoor resistance attached to the inner surface of the opening side located on the indoor side of the cylinder. The outer resistance plate is formed of a semi-circular plate that blocks half of the air flow path in the cylinder, and the indoor resistance plate is circular centered on a position deviated from the center of the circle of the cylinder. A circle provided with a hole and a plurality of arc-shaped slits formed around the outer circumference of the circular hole, and an outer peripheral surface forming a plurality of slits due to an arc-shaped gap between the hole and the inner peripheral surface of the cylindrical body. The structure was formed by a shape plate.
Further, the background noise generator according to the present invention is an exhaust means using an air supply hole provided in the building for communicating the outside and the inside of the building and an exhaust fan for exhausting the air inside the building to the outside of the building. And a resistance part provided inside the air supply hole and serving as a resistance when air passes through the inside of the air supply hole, and the resistance part is an outside mounted on the inner surface of the air supply hole having a circular cross section on the outside side of the building. It is provided with a side resistance plate and an indoor resistance plate attached to the inner surface of the indoor side of the air supply hole, and the external resistance plate is formed by a semicircular plate that blocks half of the air flow path of the air supply hole, and is on the indoor side. The resistance plate is provided with a circular hole centered on a position deviated from the center of the circle of the air supply hole, and a plurality of arcuate slits formed on the outer periphery of the circular hole, and the inner peripheral surface of the air supply hole. The structure is formed by a circular plate having an outer peripheral surface that forms a plurality of slits with arcuate gaps between them.
According to the background noise generator according to the present invention, since the resistance portion is provided , the resistance when air passes through the resistance portion is increased, and the loudness of the sound flowing into the room through the air supply hole is increased. It is possible to realize an indoor environment in which it is difficult to hear the living sounds from the outside.
In addition, if the air supply hole is equipped with an air supply fan provided at the air supply port on the indoor side, the air supply fan is continuously driven for 24 hours to create an indoor environment in which it is difficult to hear the living noise from the outside. At the same time, the ventilation volume by the air supply fan can be reduced, so that the introduction of cold air from the outside of the building to the inside of the building in winter and the introduction of warm air from the outside of the building to the inside of the building in summer can be alleviated .
Also, the resistance portion, so configured with a nonwoven fabric on the interior side, by the resistance due to the air introduced into the air supply hole collides with nonwoven, can be realized hardly indoor environment heard live sound from outside ..

FIG. 6 is a cross-sectional view (Embodiment 1) showing a configuration on the air supply hole side of the background noise generator. The perspective view which shows the resistance part of the background noise generator (the first embodiment). The front view which shows the indoor side resistance plate and the outside side resistance plate (Embodiment 1). A front view and a rear view showing a resistance portion of the background noise generator (Embodiment 1). FIG. 2 is a cross-sectional view (Embodiment 2) showing a configuration on the air supply hole side of the background noise generator. The figure which shows the experimental result. The figure which shows the experimental result. The figure which shows the detail of each test piece used in an experiment.

Embodiment 1
The background noise generation method of the first embodiment using the 24-hour ventilation system will be described.
As a 24-hour ventilation system, an air supply fan is attached to the air supply port on the indoor side of the air supply hole formed so as to penetrate the outer wall of the building, and the air supply fan forcibly supplies the outside air into the room and also exhausts the exhaust hole. Type 1 ventilation system in which an exhaust fan is attached to the exhaust port of the building and forced exhaust by the exhaust fan, type 2 ventilation system in which forced air is supplied using the air supply air supply fan and the exhaust is natural ventilation. There is a third-class ventilation system in which the air is naturally supplied and forced exhaust is performed using an exhaust fan for exhaust.

The background noise generation method of the first embodiment is a method of performing natural air supply through an air supply hole communicating the outside of the building and the inside of the building as a 24-hour ventilation system and forcibly exhausting using an exhaust fan, that is, a third method. As shown in Fig. 1, in order to realize an indoor environment in which it is difficult to hear the living sounds from the outside by increasing the loudness of the sound flowing into the room through the air supply holes in the building that adopts the seed ventilation method. In addition to providing a resistance portion 2 that serves as a resistance when air passes through the air supply hole 1, an air supply unit 4A having a built-in air supply fan 4 is provided in the air supply port 3 on the indoor R side of the air supply hole 1. I did.

That is, as shown in FIG. 1, the background noise generator of the first embodiment that realizes the background noise generation method of the first embodiment is provided on the outer wall 5 of the building in order to communicate the outside F of the building and the interior R. When the air supply hole 1 and the exhaust means using an exhaust fan (not shown) for exhausting the air in the room R to the outside F of the building and the air provided inside the air supply hole 1 and pass through the inside of the air supply hole 1 The configuration is provided with a resistance portion 2 that serves as a resistance to the air supply hole 1 and an air supply unit 4A with a built-in air supply fan 4 provided at the air supply port 3 on the indoor R side in the air supply hole 1.

For example, the building has an air supply hole 1 formed in the outer wall 5 of each living room in the building, and an exhaust fan installed in the ceiling or outer wall of an unillustrated bathroom, washroom, toilet, etc. provided inside the building. In a building that employs a type 3 ventilation system 24-hour ventilation system that is configured to discharge the air taken into the room R from the outside F through the air supply hole 1 to the outside F of the building via an exhaust fan. As a method of generating background noise to make it difficult for a person in the room R to hear the living noise from the outside, a resistance portion 2 is provided inside the air supply hole 1 and an air supply port on the room R side in the air supply hole 1. By attaching an air supply unit 4A having a built-in air supply fan 4 to 3, background noise is generated in which the loudness of the sound flowing into the room R through the air supply hole 1 is increased.

In the case of a building having a reinforced concrete structure, the air supply hole 1 penetrates the outer wall 5 by attaching a pipe 6 to a formwork (not shown) and placing concrete in the formwork when constructing the outer wall 5. It is formed by the inner space of the pipe 6 installed so as to communicate with the outside F of the building and the inside R. Further, also in the case of a building having a wooden structure or a steel structure, the air supply hole 1 is formed by the inner space of the pipe 6 installed so as to penetrate the outer wall and communicate with the outside F of the building and the interior R.
A vent cap 8 is attached to the air supply port 7 on the F side outside the building in the air supply hole 1.

That is, the background noise generator of the first embodiment is formed on the outer wall 5 of a building such as an apartment that adopts the third type ventilation system as a 24-hour ventilation system, and supplies the building exterior F and the interior R to communicate with each other. A resistance portion 2 that serves as a resistance when air passes through the pores 1 is provided, and an air supply unit 4A that continuously drives the air supply fan 4 for 24 hours is attached to the indoor air supply port 3 of the air supply holes 1. As a result, the A characteristic sound pressure level (noise level) of the room R is increased and the ventilation volume by driving the air supply fan 4 is reduced as compared with the case where the resistance portion 2 is not provided inside the air supply hole 1. It is a device that allows you to do so.
The A characteristic sound pressure level of the indoor R is set to about 33 to 35 dB at a point 1.5 m from the indoor air supply port 3, and the ventilation volume driven by the air supply fan 4 is 11 m ³ / h. It is preferable to make it a degree.

As shown in FIGS. 1 and 2, the resistance portion 2 includes, for example, a cylindrical body 21 formed with an outer diameter corresponding to the inner diameter of the pipe 6 forming the air supply hole 1, and openings at both ends of the cylindrical body 21. As resistance plates provided in the vicinity, an indoor resistance plate 22 attached to the inner surface of the one end opening side of the cylindrical body 21 so as to be located on the indoor side, and a cylindrical body 21 so as to be located on the outer side of the building. It is configured to include an external resistance plate 23 attached to the inner surface on the other end opening side of the above.

As shown in FIG. 3, the indoor resistance plates 22 are formed on the outer periphery of a circular plate having a plate thickness of about 0.1 mm to 1 mm and having a diameter dimension corresponding to the diameter dimension of the inner peripheral surface of the cylindrical body 21. A circular hole 25 is formed inside the circular plate in which the outer peripheral edge of the circular plate is removed by about several mm along the outer circumference, leaving four portions separated by 90 ° (central angle) as the connecting portion 24. In addition, a plurality of arc-shaped slits 26 are formed around the outer circumference of the circular hole 25.
The circular hole 25 is a circular hole formed in the circular plate so that the center 25C is located below the center 22C of the circular plate (= the center 22C of the circle of the cylindrical body 21). That is, the circular hole 25 is formed eccentrically from the center 22C of the circular plate. That is, the circular hole 25 and the circular plate are formed so as to be non-concentric circles.
The arc-shaped slits 26 leave three portions around the circular hole 25 that are 120 ° apart from each other as non-slit portions 27, and the non-slit portions 27 that are adjacent to each other except for the three non-slit portions 27. It is provided along the outer circumference of the circular hole 25 between the non-slit portion 27 and the non-slit portion 27.
Then, as shown in FIGS. 2; 4, each connection portion 24 of the indoor resistance plate 22 and the inner peripheral surface of the cylindrical body 21 are connected by welding, so that the connection portions 24 and the connection portions 24 adjacent to each other are connected. A slit (outer peripheral slit) 28 is formed between the outer peripheral surface of the indoor resistance plate 22 located between the two and the inner peripheral surface of the cylindrical body 21 with an arcuate gap of about several mm.
Further, as shown in FIG. 3, the external resistance plate 23 is made of, for example, a semicircular plate having a plate thickness of about 0.1 mm to 1 mm and having a diameter dimension corresponding to the diameter dimension of the inner peripheral surface of the cylindrical body 21. It is formed.
Then, as shown in FIG. 2; FIG. 4, the semicircular arc outer peripheral surface 29 of the external resistance plate 23 and the inner peripheral surface of the cylindrical body 21 are connected by welding, so that the strings of the external resistance plate 23 are connected. A semicircular opening (flow hole) 31 is formed between the 30 and the inner peripheral surface of the cylindrical body 21.
That is, the resistance portion 2 is attached to the cylindrical body 21 formed to have an outer diameter corresponding to the inner diameter of the air supply hole 1 having a circular cross section, and the inner surface of the cylindrical body 21 on the opening side located on the F side of the outside of the building. The external resistance plate 23 is provided with an indoor resistance plate 22 attached to the inner surface of the opening side of the cylindrical body 21 located on the indoor side, and the external resistance plate 23 is the air inside the cylindrical body 21. A circular hole 25 formed of a semi-circular plate that blocks half of the flow path, with the indoor resistance plate 22 centered 25C at a position deviated from the center 22C of the circle of the cylindrical body 21, and around the outer circumference of the circular hole 25. A circular shape provided with a plurality of arc-shaped slits 26 formed and an outer peripheral surface for forming a plurality of slits (outer peripheral side slits) 28 with an arc-shaped gap between the cylindrical body 21 and the inner peripheral surface. Formed by a plate.
That is, the resistance portion 2 has a blocking surface in which the external resistance plate 23 serves as an air resistance, and the indoor resistance plate 22 has a blocking surface having a larger area than the blocking surface by the external resistance plate 23. The configuration has slits 26 and 28 that restrict the flow of air.

Then, for example, as shown in FIG. 1, the external resistance plate 23 is located on the building outer F side in the pipe 6, the indoor resistance plate 22 is located on the indoor R side in the pipe 6, and the external side. A semi-circular opening 31 formed between the arcuate outer peripheral surface 29 of the resistance plate 23 and the inner peripheral surface of the cylindrical body 21 is located above the building, and a circular hole 25 formed in the indoor resistance plate 22 is a building. After inserting and arranging the cylindrical body 21 into the pipe 6 from the indoor R side so as to be located below, the outer peripheral edge of the opening of the cylindrical body 21 on the indoor R side and the inner peripheral surface of the pipe 6 from the indoor R side. By fixing and by welding, the resistance portion 2 is installed in the pipe 6.
As a result, the plate surfaces of the external resistance plate 23 and the indoor resistance plate 22 serve as a blocking surface for blocking air introduced into the air supply hole 1 from the outside R of the building, and are introduced into the air supply hole 1 from the outside F of the building. The air flows into the room R through the semicircular opening 31, the circular hole 25, and the slits 27 and 28.
Then, after installing the resistance portion 2 in the pipe 6, the air supply unit 4A with the built-in air supply fan 4 is attached to the air supply port 3 on the indoor R side in the air supply hole 1.

Therefore, according to the background noise generator of the first embodiment, as shown in FIG. 1, the air supply fan 4 is driven to introduce the air supply fan 4 into the air supply hole 1 from the outside F via the lower opening 8a of the vent cap 8. The air A to be generated reaches the air supply fan 4 via the semicircular opening 31, the circular hole 25, and the slits 27 and 28, is sucked by the air supply fan 4, is introduced into the room R, and circulates in the room R. After that, the air is discharged to the outside F of the building by an exhaust means equipped with an exhaust fan, an exhaust duct, etc. (not shown).

According to the background noise generator of the first embodiment, since the air supply fan 4 is provided in the indoor air supply port 3 of the air supply hole 1, the A characteristic sound pressure level of the room R is generated by the driving sound of the air supply fan 4. As the (noise level) increases and the resistance portion 2 is provided inside the air supply hole 1, the air introduced into the air supply hole 1 collides with the blocking surfaces of the external resistance plate 23 and the indoor resistance plate 22. Due to the resistance caused by the noise, the resistance when passing through the slits 27 and 28, etc., the A characteristic sound pressure level of the room R becomes larger and the air supply is increased as compared with the case where the resistance portion is not provided inside the air supply hole 1. The ventilation volume by the fan 4 is reduced. That is, the external resistance plate 23 forms a blocking surface that serves as air resistance, the indoor resistance plate 22 has a blocking surface having a larger area than the blocking surface by the external resistance plate 23, and the air flow is restricted. Since the slits 26 and 28 are provided, the resistance when air passes through the resistance portion 2 is increased, the A characteristic sound pressure level of the room R is increased, and the ventilation volume by the air supply fan 4 is reduced.
That is, with high heat insulation and high airtightness, the level of sound incident from the outside of the building to the inside of the building is reduced. The A characteristic sound pressure level inside the building such as an apartment can be increased, and the living sound from the outside can be heard. It is possible to realize a difficult indoor environment. For example, it is possible to realize an indoor environment in which it is difficult to hear the living sounds from the upper floors and other neighboring houses in any house in the condominium.
Further, since the ventilation volume by the air supply fan 4 can be reduced by providing the resistance portion 2 inside the air supply hole 1, the outside F of the building in winter is accompanied by driving the air supply fan for 24 hours. It becomes possible to mitigate the introduction of cold air into the indoor R and the introduction of warm air from the outside F of the building into the indoor R in the summer.
That is, according to the background noise generator of the first embodiment, by continuously driving the air supply fan 4 for 24 hours, it is possible to construct an indoor environment in which it is difficult to hear the living noise from the outside, and from the outside F of the building to the inside R in winter. It becomes possible to mitigate the introduction of cold air into the building and the introduction of warm air from the building exterior F to the indoor R in the summer.
Further, since the opening 31 located on the F side outside the building is located above the building, rain introduced from the outside F of the building into the air supply hole 1 via the lower opening 8a of the vent cap 8. Will be difficult to reach the opening 31 located above, and it will be difficult for rain to enter the room R.

Embodiment 2
In the first embodiment, the resistance portion 2 has a configuration in which the external resistance plate 23 and the indoor resistance plate 22 are provided in the vicinity of the openings at both ends of the cylindrical body 21, respectively. As shown in FIG. The external resistance plate 23 is directly fixed to the inner surface of the pipe 6 forming the air supply hole 1 at a position close to the building external air supply port 7, and the indoor resistance plate 22 is attached to the inner surface close to the indoor air supply port 3. The resistance portion 2A may be configured so as to directly fix the.
That is, the resistance portion 2A includes an external resistance plate 23 attached to the inner surface of the air supply hole 1 having a circular cross section on the outer side of the building, and an indoor resistance plate 22 attached to the inner surface of the air supply hole 1 on the indoor side. The external resistance plate 23 is formed of a semi-circular plate that blocks half of the air flow path of the air supply hole 1, and the indoor resistance plate 22 is a circle centered on a position deviated from the center of the circle of the air supply hole 1. The hole 25 is provided with a plurality of arc-shaped slits 26, 26 ... Formed on the outer periphery of the circular hole 25, and the plurality of slits 28 due to an arc-shaped gap between the hole 25 and the inner peripheral surface of the air supply hole 1. It is formed by a circular plate having an outer peripheral surface forming 28 ...
In this case, the outer peripheral edge of the external resistance plate 23 and the inner peripheral surface of the pipe 6 from the indoor R side in a state where the external resistance plate 23 is located on the building outer F side in the pipe 6 and located below the building. After being fixed by welding, the indoor resistance plate 22 is located on the indoor R side in the pipe 6, and the circular hole 25 is located on the lower side of the building from the indoor R side to the outside of the indoor resistance plate 22. By fixing the peripheral edge and the inner peripheral surface of the pipe 6 by welding, the resistance portion 2A can be formed inside the air supply hole 1.
Also in the second embodiment, as in the first embodiment, the A characteristic sound pressure level of the room R is increased, and the ventilation volume by the air supply fan 4 is reduced as compared with the case where the resistance portion is not provided inside the air supply hole 1. Therefore, it is possible to construct an indoor environment in which it is difficult to hear the living sounds from the outside, and to mitigate the introduction of cold air from the outside F of the building to the inside R in winter and the introduction of warm air from the outside F of the building to the inside R in summer. Become.

Embodiment 3
The background noise generator is a resistance portion having a non-woven fabric (not shown) along the inner peripheral surface of the cylindrical body 21 located on the indoor side of the indoor resistance plate 22 of the resistance portion 2 described in the first embodiment, or a resistance portion. A configuration may be provided in which a resistance portion having a non-woven fabric (not shown) is provided along the inner peripheral surface of the air supply hole 1 located on the indoor side of the indoor resistance plate 22 of the resistance portion 2 described in the second embodiment. ..
Also in the third embodiment, when the A characteristic sound pressure level of the room R is increased due to the resistance caused by the air introduced into the air supply hole 1 colliding with the non-woven fabric, and the resistance portion is not provided inside the air supply hole 1. Since the ventilation volume by the air supply fan 4 is reduced as compared with the above, it is possible to construct an indoor environment in which it is difficult to hear the living noise from the outside, and the introduction of cold air from the outside F of the building to the inside R in winter and the outside F of the building in summer. The introduction of warm air into the room R can be mitigated.

In order to confirm the effect of the background noise generator according to the embodiment, the sound pressure level and the ventilation volume were measured by the following measurement methods.
-Measurement method A model simulated on the outer wall is installed in the soundless room, and a pipe is passed through the outer wall to form an air supply hole so that the height of 1300 mm is the center. An experimental device in which an air supply unit having a built-in air supply fan is attached and a vent cap is attached to the air supply port on the other end side of the air supply hole is manufactured, and the test body 1 (that is, that is, the resistance portion 2 is not provided in the pipe 6) is provided. (Test specimens in which nothing is provided in the pipe 6), test specimens 2 to 6 provided with the resistance portion 2 of the first embodiment, and test specimens 7 provided with the resistance portion 2 of the third embodiment are prepared, and the test specimens 1 to 7 are provided. The A-weighted sound pressure level, the octave band sound pressure level, and the ventilation volume were measured.
In the measurement of the A characteristic sound pressure level and the octave band sound pressure level, the height of the center position of the microphone head case is fixed at a position of 1300 mm at a position 1 m away from the position of the air supply unit, and the supply is supplied. The sound pressure level when the Qi fan was driven was measured. Since the operating sound of the air supply fan is a steady and regular sound, the equivalent sound pressure level for 15 seconds was obtained.
Ventilation volume was measured using an air flow meter.
The air supply unit used was V-08PQFF ₃ manufactured by Mitsubishi Electric, and the vent cap used was a general commercial product.
The indoor side openings of the air supply unit used in the experiment were installed on the upper and side surfaces, and the side openings were structured so that they could be closed by a shutter. It was. In addition, the air supply unit used in the experiment had two operation methods, weak operation and strong operation, but the fan noise was quiet in the weak operation, so the experiment was conducted in the strong operation. The air volume during strong operation of the air supply unit is 30 m ³ / h (catalog value).

The measurement results of the sound pressure level are shown in FIGS. 6 (a) and 6 (b), the measurement results of the ventilation volume are shown in FIG. 6 (c), and the graphs showing the measurement results of the sound pressure level are shown in FIGS. Shown in b).
The target is the frequency characteristic that is judged to be good for the subject and the ventilation volume that is judged to be good for the subject.
The details of the test bodies 2 to 7 are as shown in FIG. In FIG. 8, the diameter of the indoor resistance plate 22 is the diameter dimension a (circular diameter excluding the connecting portion 24) shown in FIG. 3A. Rust prevention is to prevent rust on the welded part, brush coating is to prevent rust by applying a rust preventive material to the welded part using a brush, and dobu-zuke is to put the whole test piece in the rust preventive material. It is a soaked rust preventive. The non-woven fabric is a test body (Embodiment 3) having a structure in which a non-woven fabric (not shown) is attached along the inner peripheral surface of the cylindrical body 21 located on the indoor side of the indoor resistance plate 22.
Further, in the test bodies 2 to 7, the inner diameter of the cylindrical body 21 is 95 mm, the diameter of the circular hole 25 of the indoor resistance plate 22 is 40 mm, and the distance between the circular hole 25 and the arc-shaped slit 26 is 5 mm (arc-shaped). The inner diameter of the slit 26 is 50 mm), the distance between the adjacent arc-shaped slits 26, 26 corresponds to the arc with a central angle of 20 ° of the circular hole 25, the slit width of the arc-shaped slit 26 is 2 mm, and the circular hole. The distance between the center of 25 and the center of the cylindrical body 21 is 11.5 mm, and the thickness of the cylindrical body 21, the indoor resistance plate 22, and the external resistance plate 23 is 0.6 mm.

As can be seen from FIGS. 6 (a), 6 (b), 7 (a), and 7 (b), the resistance portion 2 in the air supply hole 1 is compared with the test body 1 in which the resistance portion 2 is not provided in the air supply hole 1. The A characteristic sound pressure level of the test bodies 2 to 7 provided with the above is 32.3 dB or more, and the A characteristic sound pressure level of the room R is higher than that of the test body 1 in which the resistance portion 2 is not provided in the air supply hole 1. I was able to get closer to my goal.
In addition, the ventilation volume of the test bodies 2 to 7 was 17.5 m ³ / h or less, and the ventilation volume could be closer to the target than that of the test body 1.

That is, from the experimental results, when the resistance portion 2 is provided in the air supply hole 1, the A characteristic sound pressure level is larger and the ventilation volume is smaller than when the resistance portion 2 is not provided inside the air supply hole 1. By driving the air supply fan for 24 hours, it is possible to build an environment where it is difficult to hear the living sounds from other residences, and at the same time, the introduction of cold air from the building exterior F to the indoor R in winter and from the building exterior F in summer. It was demonstrated that the introduction of warm air into the indoor R can be mitigated.

Further, in the above, in a building in which natural air is supplied through an air supply hole that communicates the outside of the building and the inside of the building as a 24-hour ventilation system and forced exhaust is performed using an exhaust fan, air is provided inside the air supply hole. By providing a resistance portion that serves as a resistance when passing through, and by providing an air supply fan at the air supply port on the indoor side of the air supply hole, the loudness of the sound flowing into the room through the air supply hole is increased. We explained how to generate background noise, but in a building where natural air is supplied through air supply holes that communicate the outside and inside of the building as a 24-hour ventilation system and forced exhaust is performed using an exhaust fan. By providing a resistance portion inside the air supply hole that acts as a resistance when air passes through the air supply hole, the loudness of the sound flowing into the room through the air supply hole can be increased, or the indoor side of the air supply hole. By providing an air supply fan at the air supply port of the air supply port, the loudness of the sound flowing into the room through the air supply hole may be increased.
That is, the background noise generation method of the present invention is supplied by providing a resistance portion even if a resistance portion is provided inside the air supply hole in a building that employs a type 3 ventilation system as a 24-hour ventilation system. The loudness of the sound flowing into the room through the pores can be increased, and an indoor environment in which it is difficult to hear the living sounds from the outside can be realized.
Further, the background noise generation method of the present invention provides air supply even if an air supply fan is simply provided at the air supply port on the indoor side of the air supply hole in a building that employs a type 3 ventilation system as a 24-hour ventilation system. By driving the fan, the loudness of the sound flowing into the room through the air supply holes can be increased, and it is possible to realize an indoor environment in which it is difficult to hear the living sounds from the outside.

Further, the background noise generator of the present invention includes an air supply hole provided in the building for communicating the outside and the inside of the building, and an exhaust means using an exhaust fan for exhausting the air inside the building to the outside of the building. , A configuration having a resistance portion provided inside the air supply hole and serving as a resistance when air passes inside the air supply hole, that is, a configuration without an air supply fan may be provided. However, by providing the resistance part, the loudness of the sound flowing into the room through the air supply hole can be increased, and it is possible to realize an indoor environment in which it is difficult to hear the living sound from the outside.

Further, the background noise generating method and the background noise generating device of the present invention perform natural air supply through air supply holes that communicate the outside of the building and the inside of the building as a 24-hour ventilation system, and perform forced exhaust using an exhaust fan. It can also be applied to single-family buildings where the method is adopted. In this case, it is possible to realize an indoor environment in which it is difficult to hear the living sounds from the adjacent dwellings in the detached house.

The air supply unit 4A does not take in the air A introduced into the air supply hole 1 from the outside F of the building via the lower opening 8a of the vent cap 8 into the room R in winter, strong wind, typhoon, etc. It is desirable to use one having an opening / closing function capable of such as that, or having a warming function capable of raising the temperature of the air A discharged into the room R.
As an opening / closing function, for example, as shown in FIG. 1, as a cover 41 of the air supply unit 4A, which is attached so as to cover the indoor air supply port 3 and project so as to protrude toward the indoor R side from the indoor air supply port 3. An opening / closing mechanism such as a shutter (not shown) for opening / closing the opening 42 that discharges the air A into the room R may be used. In this case, in winter, strong winds, typhoons, etc., the opening 42 is closed to prevent cold air and wind from being taken into the room R.
As the warming function, for example, as shown in FIG. 1, a cover 41 having an intake port 44 for taking in the air of the room R on the lower surface 43 may be used. In this case, for example, in winter, the inside of the cover 41 is made negative pressure by opening the opening 42, and warm air from the indoor R is introduced into the cover 41 through the intake port 44 at the lower part of the cover 41, thereby causing the outside of the building. The cold air taken into the cover 41 from F via the lower opening 8a of the vent cap 8 is warmed and discharged from the opening 42 at the upper part of the cover 41 into the room R.
Further, as shown in FIG. 1, the cover 41 that realizes the opening / closing function or the warming function has a configuration in which the position of the lower surface 43 is aligned with the position of the lower surface of the indoor air supply port 3, so that the inner lower portion of the cover 41 is aligned. It is desirable to have a configuration that prevents dust and dirt from accumulating.

1 air supply hole, 2, 2A resistance part, 3 indoor air supply port, 4 air supply fan,
7 Air supply port on the outside of the building, 21 Cylindrical body, 22 Indoor resistance plate, 23 External resistance plate,
25 circular holes, 26, 28 slits, distribution holes, F outside the building, R inside.

Claims (4)

An air supply hole provided in the building to communicate the outside and the inside of the building, an exhaust means using an exhaust fan to exhaust the air inside the building to the outside of the building, and an air supply hole provided inside the air supply hole. It is equipped with a resistance part that acts as a resistance when air passes inside the building.
The resistance part is
A cylindrical body formed with an outer diameter corresponding to the inner diameter of the air supply hole having a circular cross section, an external resistance plate attached to the inner surface of the opening side of the cylindrical body located on the outer side of the building, and the cylindrical body. It is equipped with an indoor resistance plate attached to the inner surface of the opening side located on the indoor side.
The external resistance plate is formed by a semi-circular plate that blocks half of the air flow path inside the cylinder.
The indoor resistance plate is provided with a circular hole centered on a position deviated from the center of the circle of the cylinder and a plurality of arcuate slits formed around the outer circumference of the circular hole, and the inner peripheral surface of the cylinder. background noise generator, characterized in that formed by circular plate having an outer peripheral surface forming a plurality of slits by an arc-shaped gap between the. An air supply hole provided in the building to communicate the outside and the inside of the building, an exhaust means using an exhaust fan to exhaust the air inside the building to the outside of the building, and an air supply hole provided inside the air supply hole. It is equipped with a resistance part that acts as a resistance when air passes inside the building.
The resistance part is
It is provided with an external resistance plate attached to the inner surface of the air supply hole on the outer side of the building and an indoor resistance plate attached to the inner surface of the indoor side of the air supply hole.
The external resistance plate is formed by a semi-circular plate that blocks half of the air flow path of the air supply hole.
The indoor resistance plate includes a circular hole centered on a position deviated from the center of the circle of the air supply hole, and a plurality of arcuate slits formed around the outer circumference of the circular hole, and the inner peripheral surface of the air supply hole. background noise generator, characterized in that formed by circular plate having an outer peripheral surface forming a plurality of slits by an arc-shaped gap between the. The background noise generator according to claim 1 or 2 , wherein an air supply fan provided at an air supply port on the indoor side of the air supply hole is provided. Resistor section includes background noise generating apparatus according to any one of claims 1 to 3, characterized in that configured with a nonwoven fabric on the interior side.

Images