JP2022030080A - Background noise generating method and background noise generating device - Google Patents

Abstract

To provide a background noise generation method and a background noise generation device capable of realizing an indoor environment in which a living sound from outside is hard to be heard even in a room facing an outer wall and having no air supply hole.SOLUTION: The background noise generation method increases the loudness of sound when air flows into a room 12 through an air supply hole 1 by providing a resistance device 2 which becomes resistance when air passes inside the air supply hole 1, in a building 10 configured to supply air taken into the interior of the building from outside the building to a room 12 through an air supply hole 1 provided in a ceiling 11, a floor, or a partition wall.SELECTED DRAWING: Figure 1

Description

The present invention relates to a background noise generation method and a background noise generator that generate background noise indoors with respect to living sounds from the 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 become smaller due to the high heat insulation and high airtightness. It may be the first half.
As described above, in an environment where the level of sound incident on the inside of the building from the outside of the building is low, there is a problem that the living sound from the outside is heard indoors and is anxious. The "living sound from the outside" refers to the living sound from the upper floors of the condominium, the living sound from the adjacent other residence, the living sound from the adjacent house in the detached building, and the like.
Therefore, a resistance device is installed inside the air supply hole formed on the outer wall of the building to increase the loudness of the sound flowing into the room through the air supply hole (generated in the surrounding environment of the target noise). There is known a method that makes it possible to realize an indoor environment in which it is difficult to hear living sounds from the outside by generating (general noise other than the target noise) (see Patent Document 1 and the like).

Japanese Unexamined Patent Publication No. 2018-136091

However, since the above-mentioned method is a method of generating background noise by providing a resistance device inside the air supply hole formed on the outer wall of the building, there is a problem that it cannot be adopted in a room having no air supply hole facing the outer wall. was there.
The present invention provides a background noise generation method and a background noise generation device capable of realizing an indoor environment in which it is difficult to hear living sounds from the outside even in a room facing an outer wall and having no air supply hole.

The background noise generation method according to the present invention is configured to supply air taken into the inside of the building from the outside of the building to the room through the air supply holes provided in the ceiling, the floor, or the partition wall. By installing a resistance device inside the air supply hole that acts as a resistance when air passes through the air supply hole, the volume of sound when air flows into the room through the air supply hole is increased. Therefore, it is possible to realize an indoor environment in which it is difficult to hear the living sounds from the outside even in a room facing the outer wall and having no air supply hole.
In addition, in order to distribute the air taken into the inside of the building from the outside of the building to each of the multiple rooms in the building, air supply holes are provided in the ceiling, floor, or partition wall of each of the multiple rooms, and each air supply hole is provided. Since the resistance device is provided inside the room, it is possible to realize an indoor environment in which it is difficult to hear the living sounds from the outside in each of a plurality of rooms.
In addition, the ventilation system of the building is characterized by the first-class ventilation system that forcibly supplies the outside air from the outside of the building to the inside of the building and forcibly exhausts the outside air from the inside of the building to the outside of the building. It is possible to realize an indoor environment in which it is difficult to hear the living sounds from the outside in the room.
Further, the background noise generator according to the present invention is provided on the ceiling, floor, or partition wall of a room to blow air into the room from the space side under the ceiling, the space under the floor, or the space inside the wall. It is characterized by being equipped with an air supply hole for supplying air and a resistance device that acts as a resistance when air passes through the inside of the air supply hole, so that even in a room having no air supply hole facing the outer wall. It is possible to realize an indoor environment where it is difficult to hear the living sounds from the outside.
Further, the resistance device is provided on a cylindrical body having an outer diameter corresponding to the inner diameter of the cylinder of the cylindrical component forming the air supply hole and installed inside the air supply hole, and on one end opening side of the cylindrical body. A cross-shaped resistance plate and a circular resistance plate provided on the other end opening side of the cylinder are provided, the cross-shaped resistance plate is located inside the side of the air supply hole near the room, and the circular resistance plate is the air supply hole. Since it is located inside the side far from the room, the loudness of the sound when air flows into the room through the air supply hole can be increased.
Further, the cross-shaped resistance plate is a cross-shaped plate with a slit having a structure in which a slit is formed inside the cross-shaped plate having a diameter dimension corresponding to the diameter dimension of the inner peripheral surface of the cylindrical body. Formed in the center of each plate along the extension direction of each of the four plates protruding in all directions from the center plate of the cross, the circular resistance plate has a diameter dimension corresponding to the diameter dimension of the inner peripheral surface of the cylindrical body. It is formed based on a circular plate of the same size, and a circular hole is formed in the center of the circular plate. Remaining, the outer peripheral edge of the circular plate is a circular plate formed on the outer peripheral edge of the circle removed along the outer periphery, and four parts separated from each other by 90 ° with respect to the center of the circular hole are formed. The center of the circular hole is centered on the arcuate plate between the plates adjacent to each other in the circumferential direction, leaving as four plate portions that extend continuously toward the center of the circular hole. The arcuate slit is formed, and the outermost slit is formed by the space between the outer peripheral edge of the circle and the inner peripheral surface of the cylindrical body. The loudness of the sound when flowing into can be made louder.
Further, since the resistance device is characterized in that the slit width of the outermost slit can be changed, the loudness of the sound when air flows into the room through the air supply hole can be adjusted.
Further, the resistance device has a configuration in which the four plate portions of the cross-shaped resistance plate and the four plate portions of the circular resistance plate are provided so as to be offset in the circumferential direction and face each other, or the four plates of the cross-shaped resistance plate. Since the structure is provided so that the portion and the four plate portions of the circular resistance plate face each other, the loudness of the sound when air flows into the room through the air supply hole can be made louder. In particular, the four plate portions of the cross-shaped resistance plate and the four plate portions of the circular resistance plate are provided so as to be offset in the circumferential direction and face each other, so that air can flow into the room through the air supply hole. It will be possible to further increase the loudness of the sound when flowing in.
In addition, the resistance device is characterized in that the distance between the cross-shaped resistance plate and the circular resistance plate can be changed, so that the loudness of the sound when air flows into the room through the air supply hole. Will be able to adjust.

Sectional drawing which shows the example of the building which adopted the background noise generation method. The plan view which shows the example of the building which adopted the background noise generation method. Sectional drawing which shows the background noise generator. Perspective view showing a resistance device Front view and rear view showing the resistance device. A perspective view, a front view, and a rear view showing a resistance device. The figure which shows the experimental result of Experiment 1. The figure which shows the experimental result of Experiment 2. The figure which shows the experimental result of Experiment 3.

Embodiment 1
As shown in FIG. 1, the background noise generation method of the first embodiment is configured to supply air taken into the building 10 from the outside of the building 10 to the room 12 in the building 10 through the ceiling space 11S. For example, as a 24-hour ventilation system, a first-class ventilation system is adopted in which outside air is forcibly supplied to the inside of the building 10 from the outside of the building 10 and forced exhaust is performed from the inside of the building 10 to the outside of the building 10. By providing a resistance device 2 that acts as a resistance when air passes through the air supply hole 1 provided in the ceiling 11 of the room 12 in the building 10, the air can be sent to the room 12 through the air supply hole 1. The volume of the sound when flowing into the room is increased so that it is possible to realize an indoor environment in which it is difficult to hear the living sound from the outside even in the room 12 which faces the outer wall 9 of the building 10 and has no air supply hole. It is a noise generation method.

As shown in FIGS. 1 and 2, in a building 10 such as an apartment house (apartment) that adopts a first-class ventilation system of a 24-hour ventilation system, the air is forcibly taken into the inside of the building 10 from the outside of the building 10. The air is distributed to the rooms 12, 12 ... Inside the building 10, and the air is forcibly exhausted from a specific place to the outside of the building 10.
Therefore, in the background noise generation method of the first embodiment, in order to distribute the air taken into the inside of the building 10 from the outside of the building 10 to the plurality of rooms 12, 12 ... In the building 10, each of the plurality of rooms 12, 12 The air supply holes 1, 1 ... Are provided in the ceilings 11, 11 ... Of the ..., and the resistance devices 2, 2 ... Are provided inside each of the air supply holes 1, 1 ...
For example, as shown in FIGS. 1 and 2, the building 10 has an air supply means 13 that takes in outside air from the outside of the building 10 into the inside of the building 10, a heat exchange system 14, and a ceiling of a specific room (for example, a bedroom). The inside air intake holes 17 provided in 11, the air supply holes 1, 1 ... Provided in the ceilings 11, 11 ... Of the rooms 12, 12 ..., And the air supply holes 1, 1 ... Provided inside the air supply holes 1, 1 ... Each of the resistance devices 2, 2 ... And the exhaust means 15 for exhausting the air inside the building 10 to the outside of the building 10 are provided.

Although not shown, the air supply means 13 includes, for example, a through hole formed in the outer wall 9 of the building 10, a cylinder mounted in the through hole to form an outside air intake hole, and a heat exchange system in the cylinder. It is a means for taking in outside air into the ceiling space 11S by providing a forced air supply means such as an air supply fan provided on the other end opening side close to 14.

As shown in FIG. 2, the heat exchange system 14 performs heat exchange processing between the outside air taken in from the outside of the building 10 by the air supply means 13 and the inside air taken in from a specific room (for example, a bedroom). After that, it is a device that distributes and supplies the air after the heat exchange treatment to the rooms 12, 12, .... As the heat exchange system 14, a system having an air cleaning function in addition to the heat exchange function may be used.
In the plan view (room layout) of the building 10 in FIG. 2, E is the entrance, Cd is the corridor, BR is the bedroom, UB is the bathroom with a toilet, W is the washroom, K is the kitchen, WR is the Western room, and C is. The closet and JR are Japanese rooms, and the LD is a living / dining room.

As shown in FIG. 3, the air supply hole 1 is formed by an inner through hole 1H having a circular cross section of a cylindrical part 1A attached so as to penetrate the through hole 11a formed in the ceiling plate forming the ceiling 11. ..
A mounting flange 1F is provided on the opening edge side of one end opening (lower end opening) 1a of the cylindrical component 1A. In a state where the cylindrical component 1A is passed through the through hole 11a from the other end opening (upper end opening) 1b side and the upper surface of the mounting flange 1F and the lower surface of the ceiling plate are close to each other, for example, screws or screws are attached to the mounting flange 1F. The cylindrical component 1A is attached to the ceiling 11 by penetrating the ceiling plate and fastening to the ceiling base (not shown), and the ceiling 11 is provided with an air supply hole 1 for communicating the room 12 and the attic space 11S. It will be.
Further, on the one end opening 1a side of the cylindrical component 1A, a lid 1E provided with an opening / closing body 1R such as a louver opening / closing portion for opening / closing the one end opening (room side opening of the air supply hole 1) 1a of the cylindrical component 1A is provided. It is preferable that it is detachably attached.

Although not shown, the exhaust means 15 includes, for example, a through hole formed in the ceiling of a specific room 12 (for example, a bathroom or a washroom), a cylindrical body mounted in the through hole to form an inside air discharge hole, and the like. It is a means configured to exhaust the air in the building to the outside by providing a forced exhaust means such as an exhaust fan provided on the opening side located in the space behind the ceiling of the cylinder.

As shown in FIGS. 1 and 2, the outside air outlet (the other end opening of the above-mentioned cylinder) 13a of the air supply means 13 and the outside air intake port 14a of the heat exchange system 14 are connected by a duct 16A.
Further, as shown in FIG. 2, the inside air intake port 14b of the heat exchange system 14 and the ceiling back opening of the inside air intake hole 17 provided in the ceiling 11 of a specific room 12 (for example, a bedroom) are connected by a duct 16B. It has been. The specific room may be one or more, and the inside air intake hole 17 may be one or more.
Then, as shown in FIGS. 1 and 2, each of the treated air outlets 14c of the heat exchange system 14 and the air supply holes 1, 1 ... Provided in the ceilings 11, 11 ... Of the rooms 12, 12 ... The ceiling back opening (the other end opening (upper end opening) 1b of the above-mentioned cylindrical component 1A) is connected to the ducts 16C, 16C ...

An air supply fan is provided in the vicinity of the outside air intake port 14a and the inside air intake port 14b of the heat exchange system 14, and an exhaust fan is provided in the vicinity of the processed air outlet 14c of the heat exchange system 14. Has been done.

Therefore, the outside air taken in from the outside of the building 10 to the inside of the building 10 by the air supply means 13 is taken into the heat exchange system 14 via the duct 16A arranged in the ceiling space 11S and the outside air intake port 14a. .. Further, the heat exchange system 14 allows the inside air of a specific room 12 (for example, a bedroom) to pass through each inside air intake hole 17 provided in the ceiling 11, a duct 16B arranged in the ceiling space 11S, and an inside air intake port 14b. Is taken in by. Then, the heat exchange system 14 performs a heat exchange process between the outside air and the inside air, and the air after the heat exchange process is the treated air outlet 14c, the ducts 16C, 16C ..., each of the rooms 12, 12 ... It is distributed and supplied to each room 12, 12 ... via the air supply holes 1, 1 ... Provided in the ceilings 11, 11 ..., and the resistance devices 2, 2 ... Provided in each air supply hole 1, 1 ... Will be done.

Further, in the first-class ventilation system of the 24-hour ventilation system, the amount of air taken into the building 10 from the outside of the building 10 by the air supply means 13 and the air exhausted from the inside of the building 10 to the outside of the building 10 by the exhaust means 15. The amount of air produced is adjusted to be equal.

As shown in FIG. 3, the background noise generator used in the background noise generation method according to the first embodiment is provided on the ceiling of the room 12 and has an air supply hole for supplying air to the room 12 from the ceiling space 11S side. It is configured to include 1 and a resistance device 2 that serves as a resistance when air passes through the inside of the air supply hole 1.

As shown in FIG. 4, for example, the resistance device 2 includes a cylindrical body 21 formed to have an outer diameter corresponding to the inner diameter of the cylindrical component 1A forming the air supply hole 1 (that is, the hole diameter of the inner through hole 1H). As resistance plates provided near the openings at both ends of the cylindrical body 21, a cross-shaped resistance plate 22 and a circular resistance plate 23 are provided.
The cross-shaped resistance plate 22 is a resistance plate located on the one end opening 1a side with the flange 1F of the cylindrical component 1A when it is attached to the one end opening 21a side of the cylindrical body 21 and installed in the air supply hole 1. be.
The circular resistance plate 23 is a resistance plate located on the other end opening 1b side of the cylindrical component 1A without the flange 1F when it is attached to the other end opening 21b side of the cylindrical body 21 and installed in the air supply hole 1. be.

As shown in FIGS. 4 and 5A, the cross-shaped resistance plate 22 has, for example, a predetermined plate thickness (for example, a plate thickness of about 0.1 mm to 2 mm) and a diameter dimension of the inner peripheral surface of the cylindrical body 21. It is a cross-shaped plate with a slit having a structure in which a slit (through hole (through hole) 24 penetrating the plate) 24 is formed inside the cross-shaped plate having a size corresponding to the diameter dimension.
The slit 24 is formed in the central portion of each of the four plate portions 26, 26 ... Protruding in all directions from the central plate portion 25 of the cross along the extension direction of the four plate portions 26, 26 ....
Then, the extended end side of each of the four plate portions 26, 26 ... is welded, bonded, screwed, and engaged with the inner surface of the one end opening 21a side of the cylindrical body 21 or the opening edge of the one end opening 21a of the cylindrical body 21. It is connected by a connecting means such as a means.

As shown in FIGS. 4 and 5B, the circular resistance plate 23 has, for example, a predetermined plate thickness (for example, a plate thickness of about 0.1 mm to 2 mm) and a diameter dimension of the diameter of the inner peripheral surface of the cylindrical body 21. It is formed on the basis of a circular plate with dimensions corresponding to the dimensions. That is, a circular hole is formed in the center of the circular plate, and four portions 90 ° apart from each other on the outer circumference of the circular plate with respect to the center of the circular plate are left as connecting portions 31 to the outside of the circular plate. It is a circular plate formed on a circular outer peripheral edge 32 whose peripheral edge is removed by several mm along the outer periphery, and a circular hole 33 centered on the center of the original circular plate is formed inside the circular plate. Further, it is a circular plate with concentric arcuate slits having a configuration in which a plurality of arcuate slits 34, 35, 38 are formed around the outer circumference of the circular hole 33.

Between the circular outer peripheral edge 32 and the circular hole 33, four portions 90 ° apart from each other with respect to the center of the circular hole 33 are extended toward the center of the circular hole 33 continuously with the connecting portion 31. The arcuate plate portions 37, 37 ... Between the plate portions 36 and the plate portions 36 adjacent to each other in the circumferential direction are left as the respective plate portions 36, 36 ... It is a configuration in which slits 34, 35, and 38 are formed.
The outermost peripheral slit 38 formed on the outermost peripheral side of the circular resistance plate 23 is a slit in which the distance between the circular outer peripheral edge 32 and the inner peripheral surface of the cylindrical body 21 is the slit width. That is, the outermost peripheral slit 38 is formed by the space between the circular outer peripheral edge 32 and the inner peripheral surface of the cylindrical body 21.
The slits 34, 34 ... Formed in each of the four plate portions 36, 36 ... Are arc-shaped slits formed along the circumference of a predetermined radius centered on the center of the circular hole 33.
Further, the slits 35, 35 ... Formed in each of the four plate portions 36, 36 ... Are circles formed along the circumference of a radius larger than the above-mentioned predetermined radius centered on the center of the circular hole 33. It is an arc-shaped slit.

Then, each of the four connecting portions 31, 31 ... Is welded, bonded, screwed, and engaged to the inner surface of the cylindrical body 21 on the other end opening 21b side or the opening edge of the other end opening 21b of the cylindrical body 21. By connecting by a connecting means such as, an arcuate outermost peripheral slit 38, 38 ... Is formed between the inner peripheral surface of the cylindrical body 21 and the circular outer peripheral edge 32 of the circular resistance plate 23.
That is, the circular resistance plate 23 is provided with a configuration for forming arcuate slits 34, 35, 38 in order from the side closer to the center of the circular hole 33, that is, a plurality of concentric arcuate slits 34, 35, 38. It is a circular plate with a slit.

As shown in FIGS. 4 and 5, the resistance device is such that the plate portions 26, 26 ... Of the cross-shaped resistance plate 22 and the plate portions 36, 36 ... It may be a resistance device 2 (hereinafter referred to as a shaft cross type) provided in the above, or as shown in FIG. 6, each plate portion 26, 26 ... Of the cross-shaped resistance plate 22 and a circular resistance plate. The resistance device 2A is provided so that the plate portions 36, 36 ... Of the 23 are not displaced in the circumferential direction, that is, the plate portions 26, 26 ... And the plate portions 36, 36 ... Are facing each other. (Hereinafter, it may be referred to as an axis facing type).

The cross-shaped resistance plate 22 is located on the one end opening 1a side of the cylindrical part 1A forming the air supply hole 1 with the flange 1F, and the circular resistance plate 23 is the other end of the cylindrical part 1A without the flange 1F. The resistance device 2 or the resistance device 2A is installed inside the cylindrical part 1A so as to be located on the opening 1b side, and the cylindrical part is provided by mounting means such as welding, bonding, screwing, and engaging means. It is attached to 1A.
The resistance device 2 is attached to the inside so that the cross-shaped resistance plate 22 is located closer to the room 12 and the circular resistance plate 23 is located far from the room 12, that is, on the side of the ceiling space 11S. By attaching the cylindrical component 1A to the ceiling 11 as described above, the background noise generator is attached to the ceiling 11 of the room 12.

According to the background noise generation method using the background noise generator of the first embodiment, air is provided from the heat exchange system 14 to the ducts 16C, 16C ..., the ceilings 11, 11 ... Of the rooms 12, 12 ... When the air is distributed and supplied to the rooms 12, 12 ... Through the air supply holes 1, 1 ..., the air is supplied to the resistance device 2 or the resistance device 2A provided in the air supply holes 1, 1 ... When passing through, noise is generated due to resistance and the like. That is, the loudness of the sound when air flows into the room 12 through the air supply hole 1 and the resistance device 2 can be increased.
Therefore, even in the room 12 facing the outer wall 9 of the building 10 and having no air supply hole, it is possible to realize an indoor environment in which it is difficult to hear the living sound from the outside. In addition, it is possible to realize an indoor environment in which it is difficult to hear the living sounds from the outside in each of the plurality of rooms 12, 12 ...
Further, by adopting the first-class ventilation method as the ventilation method of the building, it is possible to smoothly ventilate the room and realize an indoor environment in which it is difficult to hear the living sound from the outside in the room 12.

That is, first, when the air from the heat exchange system 14 passes through the arcuate slits 34, 35, 38 of the circular resistance plate 23, the arcuate plate portions 37, 37 ... And the plate portions 36, 36 A sound is generated by colliding with the ..., and when the air from the heat exchange system 14 passes through the circular hole 33, the speed increases, and the air collides with the cross-shaped resistance plate 22 in the increased speed state. Since the sound is generated, the sound when the air flows into the room 12 becomes louder.

In addition, in order to confirm the effect of the background noise generator of the first embodiment, the following experiment was conducted.
・ Experiment 1
An experiment to verify how the relationship between the A-weighted sound pressure level and the air volume is changed by changing the slit width of the outermost slit 38 of the circular resistance plate 23.
・ Experiment 2
An experiment to verify what the A-weighting sound pressure level becomes by changing the distance between the cross-shaped resistance plate 22 and the circular resistance plate 23.
・ Experiment 3
An experiment to verify what the A-weighting sound pressure level and the 1/3 octave band sound pressure level will be with the above-mentioned axis cross type and axis facing type.

-Experimental method A ceiling model simulating a ceiling is installed in a non-sounding room, and a cylindrical body is penetrated through the ceiling model to form an air supply hole 1, and a cross shape is formed in the air supply hole 1 on one end opening side of the air supply hole 1. A resistance device 2 (shaft cross type) or a resistance device 2A (shaft facing type) is installed so that the resistance plate 22 is located and the circular resistance plate 23 is located on the other end opening side of the air supply hole 1, and the air supply hole 1 is installed. We made an experimental device that allows wind to pass from the other end opening side to the one end opening side, and verified the difference in effect due to the difference in the test piece of the resistance device 2. In the experiment, a sealing box was provided on the back surface of the ceiling model to surround the other end opening side of the air supply hole 1, and the sealing box and the blower fan were connected by a duct of about 20 m, and a muffling box was installed in the middle of the duct. As a configuration, the air is blown from the blower fan to the resistance device 2 inside the sealed box so that the sound generated from the blower fan is not measured.
In the measurement of the A characteristic sound pressure level and the 1/3 octave band sound pressure level, the center position of the head case of the microphone was fixed at a position 1 m away from the center position of one end opening of the air supply hole 1.
Then, the blower fan was driven to measure the sound pressure level of the sound generated when the wind passed through the resistance device 2.
Since the operating sound is a steady sound, the equivalent sound pressure level for 20 seconds was obtained.
Ventilation volume was measured using an air flow meter.

In Experiment 1, a shaft cross type resistance device 2 was used. The outer diameter of the cylindrical body 21 of the resistance device 2 is 90 mm, the diameter of the circular hole 33 of the circular resistance plate 23 is 40 mm, the test piece S without the resistance device 2 (without the resistance device 2), and the outermost peripheral slit. The test piece 1 having the slit width of 38 set to 1 mm, the test piece 2 having the slit width of the outermost peripheral slit 38 set to 3 mm, the test piece 3 having the slit width of the outermost peripheral slit 38 set to 5 mm, and the slit width of the outermost peripheral slit 38. Using the test body 4 having a diameter of 10 mm, it was verified how the A characteristic sound pressure level changes when the passing air volume is changed for each test body.

The experimental results of Experiment 1 are shown in FIG.
The following tendencies were found from the experimental results of Experiment 1.
(1) When the width of the slit 38 is reduced, the sound generated (A characteristic sound pressure level) becomes large.
(2) As the air volume increases, the A-weighting sound pressure level increases.

In Experiment 2, the outer diameter of the cylindrical body 21 is 90 mm, the diameter of the circular hole 33 of the circular resistance plate 23 is 40 mm, the outermost peripheral slit 38 has a slit width of 3 mm, and the shaft cross type resistance device 2 and the shaft facing type. Using the resistance device 2A, in each type of resistance device, the distance between the cross-shaped resistance plate 22 and the circular resistance plate 23 is changed to 10 mm, 20 mm, 30 mm, and 40 mm, and the A characteristic sound pressure level is measured. Then, it was verified how the A characteristic sound pressure level changes depending on the difference in the interval.

The experimental results of Experiment 2 are shown in FIG.
The following tendencies were found from the experimental results of Experiment 2.
(1) The loudness of the generated sound changes by changing the distance between the cross-shaped resistance plate 22 and the circular resistance plate 23, and the generated sound becomes louder when the distance is narrowed.

In Experiment 3, the outer diameter of the cylindrical body 21 is 90 mm, the diameter of the circular hole 33 of the circular resistance plate 23 is 40 mm, the outermost peripheral slit 38 has a slit width of 3 mm, and the shaft cross type resistance device 2 and the shaft facing type. Using the resistance device 2A, in the shaft cross type, the distance between the cross-shaped resistance plate 22 and the circular resistance plate 23 is set to 10 mm for the test body 1, 20 mm for the test body 2, and 30 mm for the test body 3. In addition to using the test body 4 having a diameter of 40 mm, the distance between the cross-shaped resistance plate 22 and the circular resistance plate 23 was set to 10 mm for the test body 5 and 20 mm for the test body 6 and 30 mm in the axial facing type. Using the test body 7 and the test body 8 having a size of 40 mm, the 1/3 octave band sound pressure level was measured in each test body.

The experimental results of Experiment 3 are shown in FIG.
The following tendencies were found from the experimental results of Experiment 3.
(1) The shaft cross type resistance device 2 produces a louder sound when the distance between the cross-shaped resistance plate 22 and the circular resistance plate 23 is narrow.

Embodiment 2
In the first embodiment, a background noise generator configured by installing a resistance device including a cylindrical body 21, a cross-shaped resistance plate 22, and a circular resistance plate 23 inside the air supply hole 1 is exemplified, but background noise is generated. The device may have a configuration in which the cross-shaped resistance plate 22 and the circular resistance plate 23 are directly attached to the inside of the cylindrical component 1A forming the air supply hole 1. That is, the cross-shaped resistance plate 22 is attached to the inside of the one end opening 1a side with the flange 1F of the cylindrical component 1A forming the air supply hole 1, and there is no flange 1F of the cylindrical component 1A forming the air supply hole 1. A background noise generator may be configured in which a circular resistance plate 23 is attached to the inside of the other end opening 1b side.

Embodiment 3
In consideration of the above-mentioned experiment 1, in the third embodiment, a background noise generator capable of changing the slit width of the outermost slit 38 of the circular resistance plate 23 is used. That is, in order to make it possible to change the distance between the inner peripheral surface of the cylindrical body 21 or the inner peripheral surface of the cylindrical component 1A forming the air supply hole 1 and the circular outer peripheral edge 32, the circular outer peripheral edge 32 from the center of the circular hole 33. A background noise generator in which a plurality of types of circular resistance plates 23 formed so as to have different distances to each other are provided, and the plurality of types of circular resistance plates 23 are detachably configured with respect to the cylindrical body 21 or the air supply hole 1. did.
According to the background noise generator of the third embodiment, by adjusting the slit width of the outermost slit 38, the loudness of the sound when air flows into the room 12 through the air supply hole 1, that is, the darkness generated. It is possible to provide a background noise generator whose loudness can be adjusted.

Embodiment 4
In consideration of the above-mentioned experiments 2 and 3, the background noise generator is configured so that the distance between the cross-shaped resistance plate 22 and the circular resistance plate 23 can be changed.
According to the background noise generator of the fourth embodiment, by adjusting the distance between the cross-shaped resistance plate 22 and the circular resistance plate 23, the sound when air flows into the room 12 through the air supply hole 1 is heard. It is possible to provide a background noise generator capable of adjusting the size, that is, the magnitude of the background noise to be generated.

In the embodiment, the background noise generator and the inside air intake hole are provided on the ceiling, but the background noise generator and the inside air intake hole 17 may be provided on the floor. In this case, the air supply means, the heat exchange system, the duct, etc. may be provided in the underfloor space.
That is, in a building configured to supply air taken into the interior of the building from the outside of the building to the room through the air supply holes provided on the floor, the resistance when the air passes through the air supply holes. By providing a resistance device, the background noise generation method is such that the loudness of the sound when air flows into the room through the air supply hole is increased, and the background noise used in the background noise generation method is increased. The generator is configured to include an air supply hole provided on the floor of the room for supplying air to the room from the underfloor space side, and a resistance device that acts as a resistance when air passes through the inside of the air supply hole. do it.

Further, the background noise generator and the inside air intake hole 17 may be provided in the partition wall having the space inside the wall. In this case, the duct or the like may be provided in the space inside the wall.
That is, in a building configured to supply air taken into the inside of the building from the outside of the building to the room through the air supply holes provided in the partition wall, the resistance when the air passes through the inside of the air supply holes. By providing a resistance device, the background noise generation method is such that the loudness of the sound when air flows into the room through the air supply hole is increased, and the darkness used in the background noise generation method is used. The noise generator is provided with an air supply hole provided on the partition wall of the room to supply air to the room from the space side inside the wall, and a resistance device that acts as a resistance when air passes inside the air supply hole. It may be configured as such.

Further, a resistance device may be provided in the inside air intake hole 17 to form a background noise generator.
Further, the material of the resistance device is not particularly limited. For example, the resistance device may be formed of synthetic resin, metal, or the like.

The configuration may not include a heat exchange system and a duct.
In this case, the configuration may not include one or both of the forced air supply means and the forced exhaust means.
In such a case, an air supply fan may be provided in the air supply hole 1 in order to supply air from the outside of the building through the space under the ceiling, the space under the floor, and the space inside the wall into the room.

Further, in the embodiment, in order to distribute the air taken into the inside of the building from the outside of the building to each of the plurality of rooms in the building, an air supply hole is provided in the ceiling of each of the plurality of rooms, and a resistance device is provided inside each air supply hole. However, it is not always necessary to distribute the room to each of a plurality of rooms in the building. That is, by providing an air supply hole on the ceiling, floor, or partition wall of a specific room in the building, and providing a resistance device that acts as a resistance when air passes inside the air supply hole. The loudness of the sound when air flows into the room through the air supply hole may be increased.

The cylindrical body of the air supply means 13 described above, the cylindrical component 1A forming the air supply hole 1, and the cylindrical body of the exhaust means 15 do not necessarily have to be a cylinder, and may be, for example, a cylindrical body such as a square cylinder. ..

Further, the resistance device may be configured to include only one of a circular resistance plate and a cross-shaped resistance plate.

Further, the resistance device may have any configuration as long as it is a resistance when air passes through the inside of the air supply hole.

Further, in the embodiment, an apartment house such as a condominium is exemplified as a building, but the present invention can be applied to a detached house, a hotel, an office, and other buildings.

1 air supply hole, 2,2A resistance device, 10 buildings, 11 ceilings, 12 rooms,
21 Cylindrical body, 22 Cruciform resistance plate, 23 Circular resistance plate, 26 Plate part, 31 Connection part,
36 Plate, 38 Outermost slit.

Claims (9)

In a building configured to supply air taken into the interior of the building from the outside of the building to the room through the air supply holes provided in the ceiling, floor, or partition wall.
By providing a resistance device inside the air supply hole that acts as a resistance when air passes through the air supply hole, the loudness of the sound when the air flows into the room through the air supply hole is increased. Background noise generation method. In order to distribute the air taken into the inside of the building from the outside of the building to each of the multiple rooms in the building, air supply holes are provided in the ceiling, floor, or partition wall of each of the multiple rooms, and the inside of each air supply hole is provided. The background noise generation method according to claim 1, wherein a resistance device is provided in the room. Claim 1 or claim characterized in that the ventilation system of the building is a first-class ventilation system in which the outside air is forcibly supplied from the outside of the building to the inside of the building and the outside air is forcibly exhausted from the inside of the building to the outside of the building. Item 2. The method for generating background noise according to item 2. Air supply holes provided on the ceiling, floor, or partition wall of the room to supply air to the room from the attic space side, the underfloor space side, or the space inside the wall, and the air supply holes. A background noise generator characterized by being provided with a resistance device that acts as a resistance when air passes through the inside. The resistance device is
A cylindrical body formed inside the air supply hole and having an outer diameter corresponding to the inner diameter of the cylinder of the cylindrical component forming the air supply hole, and a cross-shaped resistance plate provided on one end opening side of the cylindrical body. A circular resistance plate provided on the other end opening side of the cylinder is provided.
The background noise generation according to claim 4, wherein the cruciform resistance plate is located inside the air supply hole on the side closer to the room, and the circular resistance plate is located on the inside far from the air supply hole room. Device. The cruciform resistance plate is a cruciform plate with a slit having a structure in which a slit is formed inside the cruciform plate having a diameter dimension corresponding to the diameter dimension of the inner peripheral surface of the cylindrical body, and the slit is a cross. It is formed in the central part of each plate part along the extension direction of each of the four plate parts protruding from the central plate part in all directions.
The circular resistance plate is formed based on a circular plate whose diameter dimension corresponds to the diameter dimension of the inner peripheral surface of the cylindrical body, and a circular hole is formed in the center of the circular plate, and the center of the circular plate is used as a reference. As a circular plate formed on the outer peripheral edge of the circular plate, the outer peripheral edge of the circular plate is removed along the outer peripheral edge, leaving four portions 90 ° apart from each other as connecting portions on the outer peripheral edge of the circular plate. , The four parts 90 ° apart from each other with respect to the center of the circular hole are left as four plate parts that are continuous with the connection part and extend toward the center of the circular hole, and the plate parts that are adjacent to each other in the circumferential direction. An arcuate slit centered on the center of the circular hole is formed in the arcuate plate portion between the plate portion and the outermost peripheral slit due to the space between the outer peripheral edge of the circle and the inner peripheral surface of the cylindrical body. The background noise generator according to claim 5, wherein the background noise generator is formed. The background noise generating device according to claim 6, wherein the resistance device is configured so that the slit width of the outermost slit can be changed. The resistance device is
A configuration in which the four plate portions of the cross-shaped resistance plate and the four plate portions of the circular resistance plate are provided so as to be offset in the circumferential direction and face each other.
Or,
The background noise generator according to claim 6 or 7, wherein the four plate portions of the cross-shaped resistance plate and the four plate portions of the circular resistance plate are provided so as to face each other. The background noise generator according to any one of claims 5 to 7, wherein the resistance device is configured so that the distance between the cross-shaped resistance plate and the circular resistance plate can be changed.

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