JP2011074680A - Ventilating and soundproof door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilating and soundproof door A satisfying both of ventilation and soundproof requirements while preventing degradation of the inside of the door A and maintaining the sound insulation performance of the door A itself. <P>SOLUTION: A ventilation passage 24 allowing ventilation between two openings 21, 22 is formed in the door A by having an end thereof communicate with the front surface side opening 21 opening in the front surface of the door A while the other end thereof communicate with the rear surface side opening 22 opening in the rear face of the door A. A sound-absorbing structure 29 of a Helmholtz resonator type including a neck portion 27, which comprises through holes 26, 26... opening in a manner of facing the ventilation passage 24, and a resonance cavity 28 communicating with the neck portion 27 and having the predetermined volume is arranged. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a ventilated soundproof door used for a building such as a house, and more particularly relates to a door with improved sound insulation without impairing breathability.

  In recent years, in order to deal with the problem of sick houses caused by formaldehyde contained in paints and adhesives used for interior finishing of houses, in accordance with the revision of the Building Standard Law, a certain degree of air permeability is maintained even when the door is closed. It is required to ensure.

And, when ventilating continuously throughout the day, that is, for 24 hours continuously, as the ventilation path in the door, an opening with an effective opening area of 100 to 150 cm ² is formed in the door, and the opening is provided with a louver. Can respond.

  However, there has been a problem that noise from outside and sound generated in the room leaks out from the opening of the louver, and in particular, there is a problem that sound generated in the toilet leaks into the adjacent corridor or living room.

  Conventionally, for example, those shown in Patent Documents 1 to 3 have been proposed as a ventilation soundproof door for satisfying both such ventilation and soundproofing.

  Although these proposals differ in detail structure, the opening portions provided at the top and bottom of the door basically open toward the indoor space and the outdoor space located on both sides of the door, and the opening portions are the doors. This is a structure in which air moves between the interior and the exterior through a vent passage formed in the interior and communicating with the top and bottom.

JP-A-9-235960 JP 2005-105579 A JP 2007-113307 A

  However, as in these proposed examples, if a ventilating path for soundproofing located in the upper and lower positions inside the door is provided, the venting path becomes a long and large space (venting space) over almost the entire door. As a result, dirty air or air that contains a lot of moisture will pass through the ventilation space for a long time, and the ventilation space is more likely to get dirty or moist, which causes the door to deteriorate from the inside. It becomes easy.

  In addition, a cavity as a ventilation space is formed almost entirely inside the door, which not only reduces the strength of the door, but also increases the sound insulation as the door surface density increases (heavy). It is unavoidable that the soundproofing property of the device itself deteriorates.

  The present invention has been made in view of such various points, and an object of the present invention is to devise the structure of the door to solve these problems and to obtain a ventilation and soundproof door satisfying both ventilation and soundproofing. There is in doing so.

  In order to achieve the above object, in the present invention, a sound absorbing structure having the principle of a Helmholtz resonator is provided in communication with an air passage formed inside the door.

  Specifically, the ventilated soundproof door according to the invention of claim 1 communicates with the inside of the door, the front side opening that opens at the door surface, and the other end at the back side opening that opens at the back of the door. A Helmholtz resonator type comprising an air passage that communicates between both openings, a neck portion that opens to face the air passage, and a resonance cavity portion that communicates with the neck portion and has a predetermined volume. A sound absorbing structure is provided.

  In the present invention, an air passage is formed inside the door, and this air passage communicates with the front surface side opening and the back surface side opening of the door. It flows to the space on the front side of the door through the road and the opening on the surface side, or flows in the opposite direction. This makes it possible to ensure ventilation between the spaces on both sides of the door.

  In addition, since the sound absorption structure of the Helmholtz resonator type is provided in the door and the neck portion is opened so as to face the air passage, the sound on the back side of the door (or the sound on the front side) passes through the air passage. When transmitted to the front side of the door (or the back side of the door), the sound is attenuated and attenuated by the principle of the Helmholtz resonator, thereby suppressing the propagation of sound between both sides of the door.

  Then, by changing the configuration of the sound absorption structure of the Helmholtz resonator type, that is, the cross-sectional area and length of the neck portion and the volume of the resonance cavity portion, it is possible to cope with a desired sound absorption region (low sound or high sound).

  Therefore, unlike the prior art, a large hollow ventilation space is not required inside the door, and only a slight improvement is required to provide a sound absorbing structure for a door having a normal volume ventilation passage. In addition, since dirty or damp air does not pass through the ventilation space inside the door, the inside of the door will not be deteriorated, and there will be no weight reduction of the door due to the hollow inside of the door, and the sound insulation performance of the door itself Can be maintained. Therefore, it is possible to achieve sound insulation of the door while preventing deterioration inside the door and maintaining the sound insulation performance of the door itself.

  According to a second aspect of the present invention, in the ventilated soundproof door according to the first aspect of the present invention, the front side opening and the rear side opening are provided with a louver frame having an opening, and an opening of the louver frame, and the door thickness. A louver having a louver (blade) extending obliquely with respect to the direction toward the center of the direction is attached, and the door thickness direction center of the opening peripheral edge in the louver frame of the front side opening and the back side opening An inclined surface for preventing the opening area between the end portion and the end portion on the central side in the door thickness direction of the louver from becoming smaller with the inclination of the louver is formed at the end portion on the side. It is characterized by.

  In the second aspect of the present invention, since the inclined surface is formed at the end of the opening peripheral edge of the louver frame on the center side in the door thickness direction, the door thickness at the rim of the opening of the louver frame is smaller than that without the inclined surface. The opening area between the center side (door inside) end and the inclined louver increases, and air flows smoothly between them without causing airflow loss due to the generation of vortices. Can be efficiently ventilated.

  As described above, according to the first aspect of the present invention, the air passage that communicates with the door surface side opening and the door back surface side opening is provided inside the door, and the neck portion that opens to face the air passage; By providing a Helmholtz resonator type sound absorbing structure with a resonance cavity portion communicating with the neck portion inside the door, ventilation is ensured between the spaces on both sides of the door, and due to the large ventilation space inside the door. While preventing deterioration of the inside of the door and maintaining the sound insulation performance of the door itself by reducing the weight of the door, the sound propagation structure between the doors can be absorbed and suppressed by the sound absorption structure of the Helmholtz resonator type.

  According to the second aspect of the present invention, the door thickness of the louver and the end of the door edge in the door thickness direction at the periphery of the opening in the louver frame of the louver attached to the door front side opening and the door back side opening By forming an inclined surface to prevent the opening area between the edge part on the center side in the vertical direction from becoming smaller with the inclination of the louver, the door thickness direction center side (inside the door) ) The air can flow smoothly between the end portion and the inclined louver without causing the generation of vortices and can be efficiently ventilated.

FIG. 1 is an enlarged cross-sectional view showing a main part of a ventilation soundproof door according to an embodiment of the present invention. FIG. 2 is a plan view of a core material to be a Helmholtz resonator. FIG. 3 is a front view of a core material that becomes a Helmholtz resonator. FIG. 4 is a diagram showing the principle of a general Helmholtz resonator. FIG. 5 is an enlarged sectional view of the louver. FIG. 6 is a front view showing the back side of the louver frame. FIG. 7 is a front view showing the front side of the louver frame. FIG. 8 is a front view of the frame inside the door. FIG. 9 is a front view of the door. FIG. 10 is a diagram showing the sound insulation performance of the ventilation soundproof door when the sound source is pink noise. FIG. 11 is a diagram showing the soundproofing performance of the ventilation soundproofing door when the sound source is the sound of washing in the toilet. FIG. 12 is a diagram showing the soundproofing performance of the ventilation soundproofing door when the sound source is a male action sound in the toilet.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the embodiments is merely illustrative in nature and is not intended to limit the present invention, its application, or its use at all.

  FIG. 9 shows the overall configuration of the ventilation soundproof door A according to the embodiment of the present invention, as viewed from the front side. The door A has a vertically long rectangular shape, and as shown in an enlarged view in FIG. 1, a front plate 1 facing the outdoor space R1 (for example, a corridor) and a back surface facing the indoor space R2 (for example, a toilet). A face plate 2 is provided. The double-sided plates 1 and 2 have the same shape and are integrally attached to the front and back of the frame 8 as shown in FIG. In addition, although the door A has mentioned as an example what partitions off a toilet and the space (corridor) of the outer side, it cannot be overemphasized that it may be another indoor or outdoor door.

  As shown in FIG. 9 again, a knob mounting portion 4 for mounting a door knob (not shown) and a box lock (not shown) are attached to the left side of the door A in the center in the height direction. For this purpose, a lock mounting portion 5 is formed side by side. This door A is a type of door that swings around the attached side as a rotation center with the side on the right side of FIG. 9 opposite to the knob mounting portion 4 being attached to a door frame (not shown).

  The frame 8 of the door A will be described with reference to FIG. 8. The frame 8 has the same shape as each of the face plates 1 and 2, and a pair of left and right vertical frames 9 that extend in the vertical direction and form left and right sides (long sides). , 9 and a pair of upper and lower horizontal frames 10, 10 extending in the horizontal direction and forming upper and lower sides (short sides) are coupled and fixed in a vertically long rectangular frame shape.

  On the lower side of the upper horizontal frame 10 and near the upper end of the door A, a pair of upper and lower horizontal rails 11 and 11A extending in the horizontal horizontal direction are arranged with a predetermined interval. The left and right end portions of the left and right are coupled to the left and right vertical frames 9,9. Between the upper horizontal frame 11 and the upper horizontal frame 10, four short vertical beams 12, 12,... Extending in the vertical direction are arranged in the horizontal direction, and the upper and lower ends are respectively arranged in the horizontal beam 11 and the upper horizontal frame 10. These vertical bars 12, 12,... Are partitioned into five spaces (ranges) between the upper horizontal rail 11 and the upper horizontal frame 10, and the spaces at the left and right ends thereof are cored. Materials 13 and 13 are filled.

  A pair of left and right vertical bars 14 and 14 extending in the vertical direction are joined to the left and right ends between the upper and lower horizontal bars 11 and 11A, and the upper and lower ends are joined to the upper and lower horizontal bars 11 and 11A, respectively. Between the pair of left and right vertical bars 14 and 14 and the upper and lower horizontal bars 11 and 11A, for example, the horizontal length is 482 mm and the vertical width is 157 mm. A rectangular air passage opening 15 is formed.

  On the other hand, the lower end portion of the door A has a similar structure (note that members similar to those of the upper end portion of the door A are described with the same reference numerals). That is, a pair of upper and lower horizontal rails 11A, 11 extending in the horizontal horizontal direction are disposed at a predetermined interval on the upper side of the lower horizontal frame 10 and closer to the lower end of the door A. , 11 are coupled to left and right vertical frames 9,9. Between the lower horizontal beam 11 and the lower horizontal frame 10, four short vertical beams 12, 12,... Extending in the vertical direction are arranged at positions corresponding to the vertical beams 12 above and below the door A. Are arranged in the left-right direction and both upper and lower ends are joined to the horizontal beam 11 and the lower horizontal frame 10, respectively, and the lower horizontal beam 11 and the lower horizontal frame 10 are arranged by these vertical beams 12, 12,. Is divided into five spaces (ranges), and the left and right ends of the spaces are filled with the core material 13.

  In addition, a pair of left and right vertical bars 14, 14 extending in the vertical direction are joined to the upper and lower horizontal bars 11A, 11 at the left and right ends between the upper and lower horizontal bars 11A, 11 below the door A, respectively. In addition, the side surfaces are arranged in contact with the vertical frames 9 and 9, and the length between the left and right vertical bars 14 and 14 and the upper and lower horizontal bars 11A and 11 is 482 mm, for example. A rectangular ventilation passage opening 15 having a vertical width of 157 mm is formed.

  Between the lower horizontal beam 11A at the upper part of the door A and the upper horizontal beam 11A at the lower part of the door A, there are four vertical beams at positions corresponding to the vertical beams 12, 12,. Are arranged with their upper and lower ends joined to the upper and lower horizontal bars 11A, 11A, respectively, and the vertical bars 16, 16,... Are elongated vertically between the upper and lower horizontal bars 11A, 11A. The space is divided into five spaces (ranges), and the left and right end spaces are filled with particle boards 17 and 17 that are vertically elongated, for example, with a thickness of 24 mm. Further, in the remaining three spaces in the middle of the door width direction (left and right direction), five short horizontal bars 18, 18,... Extending in the horizontal direction are adjacent to both ends at the same height position in the spaces. Are arranged in a state of being joined to the vertical rails 16, 16, and the respective horizontal rails 18, 18,... Are partitioned into six spaces arranged vertically. The six spaces for each space are divided into two types, large and small, and the two spaces at the top and bottom ends (six for the door A as a whole) are the same height as each other and the vertical width of the horizontal rail 11 is about the same. It is a horizontally long rectangular parallelepiped having a height (for example, 30 mm). The remaining four (12 doors as a whole) have the same height, but are vertically long. The former two spaces constitute a resonance cavity 28 in each sound absorbing mechanism 29 described later. Each of the latter four spaces is filled with a sound absorbing material 19 such as glass wool.

  As shown in FIG. 9, the surface plate 1 has horizontally long surface-side openings 21 and 21 that extend in the horizontal direction at the upper and lower end portions. As shown in FIG. 1, the upper surface side opening 21 has an upper end at the upper end of the upper vent passage opening 15 in the frame 8 (lower end of the cross rail 11), and left and right ends at the upper vent passage. The lower ends of the openings 15 coincide with the left and right ends, respectively, and the lower ends of the openings 15 are lower than the upper ends of the upper vent passage openings 15 by about 1/3 of the vertical height after the singing. On the other hand, the lower surface side opening 21 has a lower end at the lower end of the lower vent passage opening 15 (the upper end of the horizontal rail 11) in the frame 8 and a left and right end at the lower vent passage opening 15. Respectively, and the upper end is located at a position higher than the lower end of the lower vent passage opening 15 by a height of about 1/3 of the vertical height of the opening 15.

  On the other hand, as shown by broken lines in FIG. 9, the back plate 2 is provided with horizontally long back side openings 22 and 22 extending in the horizontal direction at the upper and lower end portions. As shown in FIG. 1, the upper rear surface side opening 22 has a lower end at the lower end of the upper vent passage opening 15 in the frame 8 (upper end of the cross rail 11A) and a left and right end for the upper vent passage. Each of the openings 15 coincides with the left and right ends, and the upper end is located at a position that is higher than the lower end of the upper vent passage opening 15 by about 1/3 of the vertical height of the opening 15. On the other hand, the lower back surface side opening 22 has an upper end at the upper end of the lower air passage opening 15 in the frame 8 (lower end of the horizontal rail 11A) and a left and right end at the lower air passage opening 15. The lower end is located at a position lower than the upper end of the lower air passage opening 15 by about 1/3 of the vertical height of the opening 15.

  As shown in FIG. 1, the front plate 1 is joined and integrated with the front surface of the frame 8, and the back plate 2 is joined and integrated with the back surface of the frame 8 so that the outer peripheral surfaces thereof coincide with each other. As a result, the upper and lower ventilation passage openings 15 and 15 of the frame 8 are closed by the front plate 1 and the rear plate 2, respectively, and upper and lower ventilation passages 24 and 24 formed by spaces surrounded by these are formed inside the door A. Has been.

  That is, as shown in FIG. 9, the door A is provided with ventilation paths 24, 24 at the upper part and the lower part of the door A, and the outdoor space R <b> 1 and the indoor space R <b> 2 through the ventilation paths 24. It is designed to ventilate between.

  The upper air passage 24 has one end (front end) communicating with the surface side opening 21 that opens on the surface plate 1 on the surface of the door A, while the other end is on the surface side opening on the back plate 2 on the back surface of the door A. The back surface side opening 22 that opens to a position lower than 21 communicates with the two openings 21 and 22. On the other hand, the lower air passage 24 has one end (front end) communicating with the surface side opening 21 that opens to the surface plate 1 on the surface of the door A, while the other end opens on the surface side of the back plate 2 on the back surface of the door A. The back surface side opening 22 that opens to a position higher than the portion 21 communicates with the opening 21 and 22 so as to ventilate.

  As shown in FIGS. 2 and 3, the lower side rail 11 </ b> A on the upper side air passage opening 15 and the lower side rail 11 </ b> A on the lower side air passage opening 15 in the frame 8 are respectively provided with air passage openings 15. A plurality (five in the illustrated example) of the same space (a portion excluding the positions of the vertical beam 16 and the particle board 17) corresponding to each space (a part of the resonance cavity 28) on the opposite side of each space Each of the through holes 26, 26,... Having a circular cross section is formed so as to penetrate each space in the vertical direction so as to communicate with the air passage opening 15. Accordingly, a neck portion 27 (neck portion) composed of a plurality of (five) through holes 26, 26,... Opened at the vertical position inside the door A so as to face each of the air passages 24, and the neck portion 27, a Helmholtz resonator type sound absorbing structure 29 is provided, which is constituted by the resonance cavity 28 composed of the space having a predetermined volume.

FIG. 4 shows the principle of the Helmholtz resonator, and the resonance frequency for sound absorption is determined by the cross-sectional area S and length L of the neck portion 27 (neck portion) and the volume V of the resonance cavity portion 28. In this embodiment, the sum of the cross-sectional areas of the plurality of through holes 26, 26,... Is the cross-sectional area S of the neck portion 27, and the vertical height of the horizontal rail 11 </ b> A (the length of the through-hole 26) The length L becomes the volume V of the resonance cavity 28. By changing the configuration of the sound absorption structure 29 of the Helmholtz resonator type, that is, the cross-sectional area S and length L of the neck portion 27 and the volume V of the resonance cavity portion 28, a desired sound absorption region (low sound or high sound) can be handled. Can be made. For example, the diameter d of each through hole 26 is d = 12 mm, the cross-sectional area S of the neck portion 27 is S = 113.04 mm ² , the vertical height of the horizontal rail 11A (the length of the through hole 26) is L = 30 mm, and the resonance cavity By setting the volume V of the portion 28 to V = 70056 mm ³ (length 97.3 mm × height 30 mm × width 24 mm), 1-2 kHz (resonance frequency 1434 Hz) can be attenuated. The through hole 26 and the resonance cavity 28 function as a Helmholtz resonator, and are different in principle from those that attenuate the cavity air as a cushion or attenuate the sound by changing the cross-sectional area. ing.

  It should be noted that one or more core members (not shown) may be arranged and fixed, for example, in the vertical direction so as not to impede ventilation in the air passage 24 in each air passage opening 15 in the frame 8. The core material can increase the rigidity of the face plates 1 and 2 in the door thickness direction at the ventilation passage opening 15.

  As shown in FIG. 1, a louver 31 is attached to each of the front surface side openings 21 of the front surface plate 1 and each of the back surface side openings 22 of the back surface plate 2, and each of the openings 21, 22 is closed to allow ventilation (note that the louver 31 is not shown in FIG. 9). Each gallery 31 has a rectangular frame-shaped louver frame 32 having a size corresponding to the openings 21 and 22 as shown in an enlarged manner in FIGS. The louver frame 32 includes a frame main body 33 that is closely fitted from the front end side to the openings 21 and 22 from the outside of the door A to a portion that is approximately the thickness of the face plate 1 and 2, and the door A of the frame main body 33. The outer peripheral portion on the base end side that is the outer side includes a flange portion 35 that protrudes along the outer surface of the face plates 1 and 2, and a rectangular opening 34 is formed inside the frame body 33.

  As shown in FIG. 5, a louver member 40 is integrally attached and fixed to the outer peripheral portion on the front end side located inside the door A of the frame body 33. The louver member 40 has a rectangular box shape made of, for example, metal, hard resin, or the like, and is fitted and fixed to the outer peripheral portion on the front end side of the frame main body 33. In the bottom portion of the louver member 40, a plurality of horizontally long vent holes 41, 41,... Are opened at a portion corresponding to the opening 34 of the frame body 33. The vent holes 41, 41,. A plurality of (two in the illustrated example) louvers 42 and 42 (blades) are provided at the boundary portion. The louvers 42 and 42 are parallel to each other, and in the gallery 31 of the lower surface side opening 21 and the upper rear surface opening 22 of the door A, the center side in the door thickness direction (inside the door A). In the gallery 31 of the upper surface side opening 21 and the lower rear surface opening 22 of the door A, the door A is directed downward toward the center side in the door thickness direction. In this way, the inclination angle θ1 with respect to the upper and lower surfaces is, for example, θ1 = 20 ° to 60 ° (40 ° ± 20 °).

  Each louver 42 can be provided, for example, by forming a substantially U-shaped slit at the bottom of the louver member 40 and cutting the portion in the slit obliquely with a line connecting the slit ends as a fulcrum. The portion including the inside of the slit becomes the vent 41.

  In the opening 34 of the frame body 33, an inclined surface 37 is formed at the distal end side (right end side in FIG. 5) located inside the door A, with the corner portion of the peripheral portion being cut out obliquely. An opening area between the upper and lower end portions and the center side end portion in the door thickness direction of the louver 42 (the right end portion in FIG. 5) is formed by the inclined surface 37 of the opening rim. It is designed to prevent it from becoming smaller with the inclination.

  The inclination angle θ2 of the inclined surface 37 is the same over the entire periphery of the opening 34, and the inclination angle θ2 with respect to the upper and lower surfaces of the upper and lower ends is substantially the same as the inclination angle θ1 of the louver 42, for example.

  Therefore, in this embodiment, the upper and lower ventilation passage openings 15 and 15 in the frame 8 of the door A are covered with the front and rear face plates 1 and 2, respectively. 15, the opening portions 21 and 22 on the front surface side and the back surface side that communicate with the opening 15 are opened at different height positions, so that the front surface side opening portion 21 and the back surface side opening portion 22 of the door A Two ventilation passages 24, 24 communicating with each other are formed. Therefore, the air in the indoor space R2 on the back side of the door A flows into the outdoor space R1 on the front side of the door A through the back surface side opening 22, the ventilation path 24, the ventilation path opening 15, and the front surface opening 21. The air flows in the opposite direction, and this allows air to be secured between the spaces R1 and R2 on both sides of the door A. For example, when the outdoor space R1 is a hallway and the indoor space R2 is a toilet, the air in the hallway is sucked by the operation of a ventilation fan (not shown) in the toilet, etc. The air flows through the ventilation paths 24, 24 above and below the door A into the toilet, and the toilet is ventilated.

  A neck portion 27 composed of a plurality of through holes 26, 26,... Opened in the horizontal rail 11A so as to face the air passages 24 at the upper and lower positions inside the door A, and communicated with the neck portion 27, A Helmholtz resonator-type sound absorbing structure 29 is provided, which is composed of a resonant cavity 28 composed of a rectangular parallelepiped space having a predetermined volume surrounded by the beam 11A, the vertical beam 16, the horizontal beam 18, and the face plates 1 and 2. Therefore, when the sound on the back side of the door A (or the sound on the front side) is transmitted to the front side of the door A (or the back side of the door A) via the air passage 24, the sound in the specific frequency range is the principle of the Helmholtz resonator. Is absorbed and attenuated. Thereby, the propagation of sound between both sides of the door A can be suppressed, and the soundproof door A is obtained.

  In this way, since the sound absorption structure 29 of the Helmholtz resonator suppresses the sound propagation on both sides of the door A, a large hollow ventilation space is provided inside the door A to eliminate the need for a cavity, and a normal volume ventilation. In the door A having a road, it is only necessary to provide the sound absorbing structure 29 on the door A, and no great improvement is required. Moreover, since the dirty or moist air does not pass through the large ventilation space inside the door A, the inside of the door A does not deteriorate. Furthermore, there is no weight reduction of the door A due to the hollowing out of the door A, and the sound insulation performance of the door A itself can be maintained. Thus, the door A can be sound-proofed while preventing deterioration inside the door A and maintaining the sound insulation performance of the door A itself.

  Then, the configuration of the sound absorption structure 29 of the Helmholtz resonator type, that is, the cross-sectional area S (diameter) and length L of the neck portion 27 and the volume V of the resonance cavity portion 28 can be changed to correspond to a desired sound absorption region. it can.

  The resonance cavity 28 is not as large as a cavity provided over the entire door A, and is not a ventilation space through which air actually flows. Therefore, the inside of the door A caused by dirty or moist air is used. There is no degradation.

  Further, in the louver frame 32 attached to the upper and lower surface side opening portions 21 and the back surface side opening portion 22 of the door A, the door 34 is inclined to the upper and lower ends of the door thickness direction center side (inside the door A). Since the surface 37 is formed, a larger opening area is secured between the central edge of the door 34 in the thickness direction of the opening 34 and the inclined louver 42 at the periphery of the opening 34 of the louver frame 32 than the case without the inclined surface 37. Then, the air flows smoothly without incurring ventilation loss due to the generation of vortices, and the air can be efficiently ventilated through the gallery 31.

(Other embodiments)
In the above-described embodiment, the air passages 24, 24 are formed at two locations above and below the door A. However, it is not always necessary to provide both the top and bottom, and only one of the locations may be provided. . However, in the case of one place, the size of the openings 21 and 22 and the louver 31 is increased in order to secure the ventilation amount. Therefore, in order to improve the design, a plurality of ventilation paths 24 are provided as in the above embodiment. It is preferable to attach a small gallery 31.

  In the above embodiment, the louver 31 has the louvers 42, 42 extending in the horizontal and horizontal directions, but the present invention is also applied to a ventilation soundproof door provided with a louver having a vertical louver. be able to.

  Next, specific examples will be described.

(Sound insulation performance)
The sound insulation performance of the ventilation soundproof door having the configuration of the above embodiment was compared with that of a general door. The sound source was pink noise, and the sound insulation performance (unit is dB) of 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, and 4 kHz was evaluated. The result is shown in FIG.

  As shown in FIG. 10, the soundproofing performance of the ventilation soundproofing door according to the embodiment is improved in a wide frequency range of 250 Hz to 4 kHz as compared with a general door.

(Evaluation by N value)
When the indoor space is a toilet and the outdoor space is a corridor, a washing sound is generated in the toilet, and the sound pressure between the actual cleaning sound recorded in the toilet and the cleaning sound recorded in the corridor The levels were compared and evaluated by N value. The result is shown in FIG. The door was compared with a general door with a ventilation soundproof type of the configuration of the above embodiment.

  Similarly, when the indoor space is a toilet and the outdoor space is a corridor, a male action sound (piss sound) is generated in the toilet, and the actual action sound recorded in the toilet is The sound pressure level was compared with the action sound recorded in the corridor, and the N value was evaluated. The result is shown in FIG. The door was compared with a ventilated soundproof type of the configuration of the above embodiment and a general door.

  11 and 12, the N value of the general door is N−45 (“sounds a little louder”) in both the washing sound and the action sound. On the other hand, the N value of the ventilated soundproof door according to the embodiment of the present invention is N-35 ("sounds smaller"), which is 10 lower than the general door, resulting in a difference of two grades. It can be seen that the soundproofing performance is effective.

  The present invention is extremely useful and industrial because it can suppress the propagation of sound between both sides of the door while ensuring the ventilation of the space on both sides of the door and preventing the deterioration inside the door and maintaining the sound insulation performance of the door itself. High availability on.

A Door 1 Front plate 2 Back plate 8 Frame 11A Horizontal beam 21 Front side opening 22 Back side opening 24 Venting passage 26 Through hole 27 Neck portion 28 Resonance cavity 29 Sound absorption structure 31 Gullary 32 Glue frame 34 Opening 37 Inclined surface θ2 Inclination angle 42 louver θ1 Inclination angle

Claims (2)

Inside the door,
An air passage that communicates with the front surface side opening that opens on the door surface while one end communicates with the back surface side opening that opens on the back surface of the door, and vents between both openings;
Ventilation characterized in that a Helmholtz resonator type sound absorbing structure comprising a neck portion that opens to face the air passage and a resonance cavity portion that communicates with the neck portion and has a predetermined volume is provided. Soundproof door. In claim 1,
In the front side opening and the back side opening, there is a louver having a louver frame having an opening, and a louver disposed at the opening of the louver frame and extending obliquely with respect to the direction toward the center side in the door thickness direction. Is installed,
The opening area between the edge and the door end in the door thickness direction of the louver is at the end in the door thickness direction center side of the opening edge in the gutter frame of the front side opening and the back side opening. A ventilation soundproof door characterized in that an inclined surface is formed to prevent the louver from becoming smaller as the louver is inclined.

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