JP6832494B2 - Sound insulation door structure - Google Patents

Description

The present invention relates to a sound insulation door structure for enhancing sound insulation in a space separated by a door.

In order to improve the sound insulation performance of the door, it is necessary to improve the sound insulation performance of the door body and to block the sound transmitted through the gap between the door and the frame body or the floor surface.

For example, in Patent Document 1 (Japanese Unexamined Patent Publication No. 2006-225909), a frame body arranged on three sides of the upper side and both sides of the opening, a peripheral airtight member fitted in the frame body, an upper edge side and both. It is composed of a pair of doors having a lower airtight device in which the edge side abuts on the peripheral airtight member to close the opening and also abuts on the lower side of the opening to shield the lower side. A sound insulation door is disclosed in which one has a mating portion at a contact portion of the other door and a mating airtight member is arranged at the mating portion.
Japanese Unexamined Patent Publication No. 2006-225909

Conventionally, in order to reduce the transmitted sound in the gap between the door and the frame, an airtight device such as a gasket is installed between the door and the frame, or an airtight device that moves up and down in conjunction with the opening and closing of the door. or installed on the door bottom and benefit was installed sound absorbing material on a surface facing the gap between the door or frame portion, measures have been applied as needed such.

Even if the above measures are taken, the gap around the door becomes a weak point in sound insulation, and the sound insulation performance of the door is mainly the sound insulation performance of the door body (the gap is completely closed) in the 1 kHz to 4 kHz band. There was a problem that it was lower than the sound insulation performance on the premise that it was present.

In addition, the airtight device deteriorates and mechanically shifts as time passes after installation, and it becomes impossible to properly close the gap between the door and the frame body. Therefore, the predetermined sound insulation performance is maintained. There was also the problem that regular maintenance was required to do so.

Further, in the door or the like in the dwelling unit, it is necessary to provide an undercut of about 10 mm between the lower part of the door and the floor surface due to the necessity of ventilation, and there is also a problem that the above airtight device cannot be installed.

The present invention solves the above problems, and in the sound insulation door structure according to the present invention, a resonator having a slit-shaped opening is embedded in the door and is located in the middle of two spaces separated by the door. , It is characterized in that an airtight device is provided.

Further, in the sound insulation door structure according to the present invention, a resonator having a slit-shaped opening is embedded in the door and a frame portion surrounding the door so that the slit-shaped opening faces each other . An airtight device is provided in the middle of the two spaces separated from each other .

Further, in the sound insulation door structure according to the present invention, a resonator having a slit-shaped opening is embedded in a mating portion of the door so that the slit-shaped opening faces each other, and the two spaces are separated by the door. It is characterized in that an airtight device is provided in the intermediate portion.

Further, the sound insulation door structure according to the present invention is characterized in that partition walls are arranged on both sides of the slit-shaped opening.

According to the sound insulation door structure according to the present invention, it is possible to improve the sound insulation performance particularly in the 1 kHz to 4 kHz band without arranging an airtight device or the like requiring maintenance, and even in a case where the airtight device cannot be installed, sound insulation is possible. Sex can be ensured.

Further, the resonator used in the sound insulation door structure according to the present invention has an advantage that maintenance is not required because deterioration or deviation does not occur even after a long period of time has passed since the installation.

Further, since the resonator used in the sound insulation door structure according to the present invention is a long body having the same cross section, it has an advantage that it is easy to manufacture and install.

It is a figure explaining the principle of the sound insulation door structure 1 which concerns on embodiment of this invention. It is a figure explaining the resonator 10 used for the sound insulation door structure 1 which concerns on embodiment of this invention. It is a front view of the sound insulation door structure 1 which concerns on embodiment of this invention. It is sectional drawing of XX'of FIG. It is a figure explaining the manufacturing process example of the resonator 10 used for the sound insulation door structure 1 which concerns on embodiment of this invention. It is sectional drawing of the sound insulation door structure 1 which concerns on other embodiment of this invention. It is sectional drawing of the sound insulation door structure 1 which concerns on other embodiment of this invention. It is a front view of the sound insulation door structure 1 which concerns on other embodiment of this invention. It is sectional drawing of YY'of FIG. It is sectional drawing of the sound insulation door structure 1 which concerns on other embodiment of this invention. It is a figure explaining the resonator 10 used for the sound insulation door structure 1 which concerns on other embodiment of this invention. It is sectional drawing of the sound insulation door structure 1 which concerns on other embodiment of this invention. It is sectional drawing of the sound insulation door structure 1 which concerns on other embodiment of this invention. It is a figure which shows the analysis example when the resonator 10 is arranged on both sides, and when it is arranged on one side. It is a figure explaining the resonator 10 used for the sound insulation door structure 1 which concerns on other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the principle of the noise reduction method adopted by the sound insulation door structure 1 according to the present invention will be described. FIG. 1 is a diagram for explaining the principle of the sound insulation door structure 1 according to the embodiment of the present invention. Further, FIG. 2 is a diagram illustrating a resonator 10 used in the sound insulation door structure 1 according to the embodiment of the present invention.

FIG. 1 is a perspective view schematically showing a gap between a door and a frame body portion. When noise propagates inside (pipeline) such as the above gap, if the cross-sectional dimension of the gap (plane perpendicular to the noise propagation direction) is less than half the wavelength of the noise, the noise is in the pipeline. It propagates in one dimension as a plane wave.

Hereinafter, in the above-mentioned gap according to the embodiment in the present specification, the noise source exists on the upstream side (sound source room), and the noise from the noise source is propagated to the downstream side (sound receiving room). Will be described as an example. Further, although an example in which the longitudinal direction of the gap is arranged in the horizontal direction will be described, the gap may be arranged in the vertical direction.

In the present invention, in the gap formed between the door and the frame body portion, of the four inner walls forming the gap, the two inner walls facing each other at the top and bottom of the perspective view are in an acoustically "soft" state. It is supposed to be done.

As shown in FIG. 1, when the wall surfaces facing each other inside the gap are acoustically "soft", that is, when the acoustic impedance ratio Z on the surface of the wall surface is 0, the noise propagated from the upstream side is on the upstream side. It is known that it is reflected to and does not propagate to the downstream side.

In the present embodiment, the description is based on an example in which two opposing wall surfaces having an acoustic impedance ratio Z on the surface facing each other in the vertical direction, but the acoustic impedance ratio Z on the surface is 0. The two facing wall surfaces may face each other in the horizontal direction.

In the existing technology described in Japanese Patent No. 3831263 and Japanese Patent No. 5454369, the acoustic impedance ratio at the mouth of the acoustic tube is at a frequency equal to 1/4 wavelength and an odd multiple frequency thereof. It utilizes the fact that Z becomes 0. In the present invention, the resonator 10 is used in order to set the acoustic impedance ratio Z on the surface of the wall surface to 0 and to bring the wall surface into an acoustically “soft” state.

In the sound insulation door structure 1 according to the present invention, a resonator 10 in which a resonance phenomenon occurs due to a slit structure having a cavity sealed behind is used as shown in FIG. FIG. 2A is a perspective view of the resonator 10. Further, FIG. 2 (B) is a cross-sectional view of the slit-shaped opening 50 of the resonator 10 of FIG. 2 (A) as viewed by cutting vertically in the longitudinal direction.

As shown in FIG. 2, the resonator 10 used in the sound insulation door structure 1 according to the present invention is basically composed of a square columnar housing 40 having a hollow inner space. On one surface of the housing 40 constituting the resonator 10, a longitudinal slit-shaped opening 50 and a partition wall portion 60 arranged on both sides of the slit-shaped opening 50 and extending into the space inside the resonator 10 It is characterized by having and, and functions as a resonator by such a structure. Each dimension of the resonator 10 is represented by a symbol shown in FIG. It should be noted that one surface of the housing 40 in which the slit-shaped opening 50 is formed and the partition wall portion 60 are orthogonal to each other.

When each dimension of the resonator 10 is sufficiently small with respect to the wavelength, the acoustic impedance ratio Z in the slit-shaped opening 50 can be obtained by the following equation (1).

However, f is the frequency of noise, c is the speed of sound, and ρ is the medium (air) density. Further, V _n is the volume of the space surrounded by the slit-shaped opening 50 and the partition wall 60 other than the shaded portion in FIG. 2 (B), and is calculated by the following equation (2) in consideration of end correction. Will be done. The second term in [] in the equation (2) is a term related to end correction. Further, in FIG. 2B, the space in the shaded area corresponds to the air layer as the resonator 10.

Further, V is the volume of the cavity of the resonator 10 (volume of the air layer) and is calculated by the following equation (3).

Further, S is the area of the slit-shaped opening 50 (slit opening) and is calculated by the following equation (4).

The first term r on the right side of the equation (1) is an acoustic resistance such as friction generated between the surface of the partition wall 60 of the resonator 10 functioning as a resonator and the air. When the partition wall 60 is made of a material having a smooth surface such as metal, the acoustic resistance r becomes an extremely small value, and the acoustic impedance ratio Z at the opening of the slit-shaped opening 50 is almost 0 at the resonance frequency f satisfying the following equation. Become.

When such two resonators 10 are arranged to face each other along the door 100 and the frame body portion 110, as shown in FIGS. 3 and 4, the slit portions facing each other at the above frequency f are formed. It becomes acoustically "soft", and the noise of frequency f propagated from the upstream side is reflected to the upstream side and does not propagate to the downstream side. FIG. 3 is a front view of the sound insulation door structure 1 according to the embodiment of the present invention. Further, FIG. 4 is a cross-sectional view taken along the line XX'of FIG.

In FIGS. 3 and 4, the two doors 100 are surrounded on all sides by a frame body 110 and a floor 120, and are configured to be openable and closable by a hinge structure (not shown). In the sound insulation door structure 1 according to the embodiment of the present invention, resonators 10 are arranged above the door 100 so that the slit-shaped openings 50 face each other in the door 100 and the frame body 110, respectively. It is buried in. Further, in the lower part of the door 100, the resonator 10 is embedded in the door 100 so that the slit-shaped opening 50 faces the floor 120.

According to the sound insulation door structure 1 composed of a pair of resonators 10 as shown on the upper side of FIGS. 3 and 4, the sound in the slit-shaped opening 50 of the opposed resonators 10 at the resonance frequency of the resonators 10 The impedance ratio becomes almost 0, and the noise incident from the sound source chamber S (upstream side) is reflected to the sound source chamber S side and does not propagate to the sound receiving chamber R side (downstream side).

In the sound insulation door structure 1 on the lower side of FIGS. 3 and 4, since the resonator 10 cannot be installed on the floor 120, it is arranged on one side. In the sound insulation door structure 1 composed of only a single resonator 10 as shown in the lower side of FIGS. 3 and 4, since the resonators 10 are not opposed to each other, the configuration is different from the above-described principle diagram. However, when the gap between the door 100 and the floor 120 is narrow with respect to the wavelength of the sound wave and the slit-shaped opening 50 of the resonator 10 has a high sound pressure reflectance on the surface of the floor 120 which is the opposite surface. In principle, the same transmitted sound reduction effect can be obtained even if the resonator 10 is installed on one side.

In the embodiment shown in FIGS. 3 and 4, an example in which the resonator 10 is arranged on one side at the lower part of the door 100 is shown, but similarly, the resonator 10 is arranged on one side on the side surface or the upper part of the door 100. May be. However, as will be described later, the effect of reducing transmitted sound is greater when the resonators 10 are arranged on both sides of the surface facing the gap.

Further, in the embodiment shown in FIGS. 3 and 4, the case where the two doors 100 are surrounded on all sides by the frame body portion 110 and the floor 120 has been described, but the door 100 is surrounded by the four-sided frame. The present invention can be applied even in the case of the configuration. In this case, a part (lower part) of the frame body of the four-sided frame corresponds to the floor 120.

Next, the manufacturing process of the resonator 10 constituting the sound insulation door structure 1 will be described. FIG. 5 is a diagram illustrating an example of a manufacturing process of the resonator 10 used in the sound insulation door structure 1 according to the embodiment of the present invention.

The outer shell member 20 is a rectangular parallelepiped-shaped box-shaped member in which one of the six surfaces is an opening surface 25. The L-shaped member 30 is a member having an L-shaped cross section and having two surfaces orthogonal to each other.

As shown in FIG. 5, the resonator 10 can be manufactured by attaching two L-shaped members 30 as described above to the opening surface 25 of the outer shell member 20.

The distance between the two L-shaped members 30 attached to the opening surface 25 of the outer shell member 20 is the slit-shaped opening 50. Further, one of the two surfaces of the L-shaped member 30 functions as a partition wall portion 60 of the resonator 10.

In the manufacturing method of the resonator 10 as described above, by preparing the outer shell member 20 and the L-shaped member 30 having various dimensions in advance, the sound insulation door structure 1 capable of easily changing the frequency to be reduced is configured. It becomes possible to do.

As described above, the sound insulation door structure 1 according to the present invention has a structure in which the resonator 10 having the slit-shaped opening 50 having an acoustic impedance ratio of 0 is embedded in the door 100. According to the sound insulation door structure 1, it is possible to improve the sound insulation performance especially in the 1 kHz to 4 kHz band without arranging an air tight device that requires maintenance, and even in a case where the air tight device cannot be installed, the sound insulation property can be improved. Can be secured.

Further, the resonator used in the sound insulation door structure 1 according to the present invention has an advantage that maintenance is not required because deterioration and deviation do not occur even after a long period of time has passed since the installation.

Further, since the resonator 10 used in the sound insulation door structure 1 according to the present invention is a long body having the same cross section, it has an advantage that it is easy to manufacture and install.

Next, other embodiments of the present invention will be described. Although the sound insulation door structure 1 according to the present invention is characterized in that an airtight device is not required, it does not prevent it from being used in combination with the airtight device.

FIG. 6 is a cross-sectional view of the sound insulation door structure 1 according to another embodiment of the present invention. In the embodiment shown in FIG. 6, the resonator 10 is embedded in the door 100 and the frame body 110, and a gasket 141 is provided as an airtight device between the door 100 and the frame body 110. I have to.

As described above, the sound insulation door structure 1 according to the present invention may be implemented in combination with existing sound insulation countermeasure means such as an airtight device and a sound absorbing material. When the side where sound is generated (sound source room S) and the side where quietness is required (sound receiving room R) are clear in the space separated by the door 100, the resonator 10 is on the sound source room S side of the airtight device. Install in. As a result, the sound transmitted through the gap between the door 100 and the frame body 110 can be efficiently reflected to the sound source chamber S side.

According to such a sound insulation door structure 1, although maintenance of the airtight device is required, the effect of reducing transmitted sound is large, and sound insulation can be ensured.

Next, other embodiments of the present invention will be described. The sound insulation door structure 1 according to the present embodiment also uses an airtight device in combination.

FIG. 7 is a cross-sectional view of the sound insulation door structure 1 according to another embodiment of the present invention. In the embodiment shown in FIG. 7, the resonator 10 is embedded in the door 100, and the door opening / closing interlocking type airtight device 142 is further provided between the door 100 and the floor 120 as an airtight device. There is. In the door opening / closing interlocking type airtight device 142, the seal member 143 is moved up and down by a drive source (not shown), so that the seal member 143 shields the space between the door 100 and the floor 120 when sound insulation is required. It is designed to do.

According to the sound insulation door structure 1 according to the present embodiment, although maintenance of the airtight device is required, the effect of reducing transmitted sound is large, and sound insulation can be ensured.

Next, other embodiments of the present invention will be described. FIG. 8 is a front view of the sound insulation door structure 1 according to another embodiment of the present invention. 9 is a cross-sectional view taken along the line YY'in FIG.

In the sound insulation door structure 1 according to the present embodiment shown in FIGS. 8 and 9, the resonators 10 are connected to each other so that the slit-shaped openings 50 face each other on the side surface of the door 100 in the combined portion 105 of the door 100. Is arranged and buried in the door 100. In the present embodiment shown in FIGS. 8 and 9, rubber fins 147 are further provided as an airtight device between the side surfaces of the door 100.

The sound insulation door structure 1 shown in FIGS. 8 and 9 is an example in which the resonator 10 is installed in the combined portion of the double doors installed in, for example, the entrance and exit of the audience seats in a hall or theater. According to such a sound insulation door structure 1, although maintenance of the rubber fin 147 is required, the effect of reducing the transmitted sound from the sound source room S in the hall / theater is large, and a large sound insulation property can be expected. it can.

Next, other embodiments of the present invention will be described. FIG. 10 is a cross-sectional view of the sound insulation door structure 1 according to another embodiment of the present invention.

In the present embodiment, as shown in FIG. 10, a space is laid out so that the slit-shaped openings 50 of the two resonators 10 face each other next to the gap between the door 100 and the frame body 110. Two resonators 10 are arranged.

According to such an embodiment, it is possible to improve the sound insulation performance particularly in the 1 kHz to 4 kHz band without arranging an airtight device or the like that requires maintenance. Further, it is possible to add the sound insulation door structure 1 according to the present invention to the existing door structure for which noise reduction measures have not been taken.

Next, other embodiments of the present invention will be described. The sound insulation door structure 1 according to the embodiment described so far exhibits a noise reduction effect at the resonance frequency f determined by the equation (5). The resonance frequency f can be adjusted to the frequency characteristics of noise by adjusting the dimensions A, B, C, a, and l shown in FIG.

However, when the target noise to be reduced by the sound insulation door structure 1 has a plurality of peak frequencies in the frequency characteristics or has frequency components in a wide band, the resonators 10 having different resonance frequencies are combined. There is a need.

Therefore, in the resonator 10 used in the sound insulation door structure 1 according to another embodiment, a device having a plurality of resonance frequencies is composed of simple and few members. More specifically, in the sound insulation door structure 1 according to the present embodiment, the resonator 10 has a rectangular parallelepiped outer shell member 20 (similar to that described above) having one open surface and a single plate shape. It is composed of a partition plate member 35 and an L-shaped member 30 having different dimensions (similar to that described above).

FIG. 11 is a diagram illustrating a resonator 10 used in the sound insulation door structure 1 according to another embodiment of the present invention. FIG. 11A is an exploded perspective view of the resonator 10 used in the sound insulation door structure 1 according to another embodiment. Further, FIG. 11B is a perspective view of the resonator 10 used in the sound insulation door structure 1 according to another embodiment. Further, FIG. 11C is a cross-sectional view of the door 100 in which the resonator 10 is embedded and the frame body portion 110 as viewed by cutting the longitudinal direction of the resonator 10 vertically.

As shown in FIGS. 11A and 11B, by attaching two L-shaped members 30 as described above and one partition plate member 35 to the opening surface 25 of the outer shell member 20. , It is possible to manufacture the resonator 10. In this case, the partition plate member 35 also functions as a partition wall portion 60.

By combining the outer shell member 20, the L-shaped member 30, and the partition plate member 35 as shown in FIG. 11, two slit resonators having space A and space B can be formed in one resonator. .. In each of the resonators, _{the acoustic impedance ratio Z of the slit-shaped opening 50 becomes almost 0 at the respective resonance frequencies f 1} and f ₂ , and as shown in FIG. 11 (C), these are the door 100 and the frame portion 110. By arranging them facing each other, a noise reduction effect is exhibited for a plurality of frequencies.

The sound insulation door structure 1 according to the other embodiment as described above can be variously provided by using the outer shell member 20 and the partition plate member 35 having the same dimensions by changing the position of the partition plate member 35 and the dimensions of the L-shaped member 30. A resonator 10 having a resonance frequency can be configured.

FIG. 12 is a cross-sectional view of the sound insulation door structure 1 according to another embodiment of the present invention. The door 100 and the frame body 110 are embedded with three slit resonators facing each other.

As shown in FIG. 12, by increasing the number of the partition plate member 35 and the L-shaped member 30, three slit resonators having space A, space B, and space C can be formed, and one outer shell member 20 can be formed. It is possible to construct a resonator 10 having three or more different resonance frequencies in the room. In this case, the partition plate member 35 also functions as a partition wall portion 60.

Further, FIG. 13 is a cross-sectional view of the sound insulation door structure 1 according to another embodiment of the present invention. The door 100 and the frame body 110 are embedded with three slit resonators facing each other.

In sound insulation door structure 1 according to another embodiment of FIG. 13, the resonator 10 is two resonators consisting of the space A and the space C is separated by the partition plate member 35 of the two spaced intervals a _t construction It has become. In this case, the slit between the two resonators is a slit-shaped opening 50 having no air layer behind. In this case, the partition plate member 35 also functions as a partition wall portion 60.

If placed opposite such resonator 10 is embedded in the door 100 and the frame body portion 110, the cross-sectional dimension of the gap between the door 100 and the frame unit 110, and the interval a _t of the partition plate member 35 is half The slit-shaped opening 50 having no air layer behind functions as an acoustic tube (space B) for frequencies below the wavelength.

In this case, the dimension D of the outer shell member 20 corresponds to the pipe length of the acoustic tube, in the frequency f _t and its odd multiples of a frequency 1/4 is equal to D of wavelength, acoustic slit opening 50 of the acoustic tube The impedance ratio Z becomes 0, and the noise reduction effect is exhibited.

In general, the above _{ft has a frequency higher than the resonance frequency f 1} or f ₂ of the slit resonator (space A and space C in FIG. 12), so that the structure is a combination of the slit resonator and the acoustic tube as shown in FIG. The sound insulation door structure 1 by the resonator 10 can exert a noise reduction effect over a wide range of frequencies.

Incidentally, Again, with respect to the frequency interval a _t the cross-sectional dimensions and the partition plate of the gap between the door 100 and the frame body portion 110 is equal to or less than a half wavelength, the slit having no air layer behind the acoustic tube Functions as. The prior art described in Patent Documents 1 and 2 required a large number of dividers to form an acoustic "tube" with a rectangular cross section. On the other hand, in the present invention, these partition plates are unnecessary.

Next, the difference between the sound insulation door structure 1 in which the pair of resonators 10 are arranged facing each other on both sides and the sound insulation door structure 1 in which the resonators 10 are arranged on only one side will be described. FIG. 14 is a diagram showing an analysis example when the resonator 10 is arranged on both sides and a case where the resonator 10 is arranged on one side, and FIG. 14 (A) shows a dimensional relationship when analyzing the arrangement on both sides of the resonator 10. FIG. (B) shows the dimensional relationship when the one-sided arrangement of the resonator 10 is analyzed, and FIG. 14 (C) shows the effect of reducing the gap transmission sound between the door 100 and the frame body portion 110 by the resonator 10.

FIG. 14 shows the result of analyzing the transmission sound reduction effect of the resonator 10 by the two-dimensional boundary element method for the gap having a width of 10 mm and a length of 40 mm.

In the dimensions shown in FIG. 14, the resonance frequency of the resonator 10 is about 1,900 Hz. The transmitted sound reduction effect shows a frequency characteristic that peaks at the resonance frequency of the resonator 10. The dimensions of the resonator 10 are not limited to the values shown in the figure, and can be appropriately set according to the target resonance frequency.

As can be seen from FIG. 14C, the absolute value of the transmitted sound reduction effect and the frequency range in which the effect can be obtained are wider in the arrangement on both sides than in the arrangement on one side of the resonator 10. Therefore, with respect to the side surface and the upper part of the door 100, and the combined portion of the double door, by installing the resonators 10 on both sides of the surface facing the gap, higher sound insulation performance of the door can be realized. However, in a place where a gap is formed between the floor 120 and the floor 120 and it is difficult to install the resonator 10, the transmitted sound reduction effect can be expected even if the resonator 10 is arranged only on one side.

In general, the sound insulation performance of a door often drops mainly in a specific band of 1 kHz to 4 kHz, and if the resonance frequency of the resonator 10 in the sound insulation door structure 1 is set in that band, the depressed sound insulation performance can be greatly improved. .. As a result, the sound insulation performance of the door can be improved as a whole.

Next, other embodiments of the present invention will be described. FIG. 15 is a diagram illustrating a resonator 10 used in the sound insulation door structure 1 according to another embodiment of the present invention.

FIG. 15A shows the resonator 10 used in the sound insulation door structure 1 according to the embodiment described so far, and FIG. 15B shows the resonator 10 used in the sound insulation door structure 1 according to the present embodiment. Is shown. In the sound insulation door structure 1 according to the present embodiment, the resonator 10 shown in FIG. 15 (B) is arranged on both sides of the door 100 and the frame body 110 (or only on one side of the door 100 or the frame body 110). It is characterized by doing.

As shown in FIG. 15A, the resonator 10 of the sound insulation door structure 1 according to the embodiment described so far is provided with partition walls 60 arranged on both sides of the slit-shaped opening 50, and these partition walls are provided. No. 60 had a length of l in the depth direction.

On the other hand, the resonator 10 of the sound insulation door structure 1 according to the present embodiment has a structure in which the partition walls 60 on both sides of the slit-shaped opening 50 are omitted. The partition wall 60 is omitted, but instead, the plate thickness on the front surface of the resonator 10 including at least the slit-shaped opening 50 has a thickness of l.

_{Due to the plate thickness l, V n} described in the previous embodiment is generated also in the resonator 10 used in the present embodiment. As a result, the sound insulation door structure 1 according to the present embodiment in which the resonator 10 in which the partition wall portion 60 is omitted can also enjoy the same effect as the sound insulation door structure 1 described above.

As described above, according to the sound insulation door structure according to the present invention, it is possible to improve the sound insulation performance especially in the 1 kHz to 4 kHz band without arranging an air tight device that requires maintenance, and even in a case where the air tight device cannot be installed. , Sound insulation can be ensured.

Further, the resonator used in the sound insulation door structure according to the present invention has an advantage that maintenance is not required because deterioration or deviation does not occur even after a long period of time has passed since the installation.

Further, since the resonator used in the sound insulation door structure according to the present invention is a long body having the same cross section, it has an advantage that it is easy to manufacture and install.

1 ... Sound insulation door structure 10 ... Resonator 20 ... Outer shell member 25 ... Opening surface 30 ... L-shaped member 35 ... Partition plate member 40 ... Housing 50 ... Slit-shaped opening 60 ... Partition 70 ... Partition plate member 100 ... Door 105 ... Combined portion 110 ... Frame body 120 ... Floor 130 ... Wall 141 ...・ Gasket (airtight device)
142 ... Door open / close interlocking type airtight device 143 ... Seal member 147 ... Rubber fin (airtight device)
S ... Sound source room R ... Sound receiving room

Claims (4)

A resonator with a slit-shaped opening
Buried in the door
A sound insulation door structure characterized in that an airtight device is provided in the middle of two spaces separated by the door. A resonator with a slit-shaped opening
It is embedded in the door and the frame portion surrounding the door so that the slit-shaped openings face each other .
A sound insulation door structure characterized in that an airtight device is provided in the middle of two spaces separated by the door. A resonator with a slit-shaped opening
It is embedded in the mating part of the door so that the slit-shaped openings face each other .
A sound insulation door structure characterized in that an airtight device is provided in the middle of two spaces separated by the door. The sound insulation door structure according to any one of claims 1 to 3 , wherein partition walls are arranged on both sides of the slit-shaped opening.

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