JP2008070062A - Ventilation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilation device with a sound insulation effect, while securing satisfactory ventilation performance, without having to require a long ventilation passage, in the ventilation device attached to a wall face of a building to ventilate the inside and the outside of the building. <P>SOLUTION: A first reflecting plate and a second reflecting plate are attached combined to a device inner portion of an outdoor air passage for taking in the outside air, and noise sound waves are received at first to be taken from the outdoor air passage into the device by the second reflecting plate. The second reflecting plate reflects one part of the received noise sound waves to the outside of the device and reflects the remaining part thereof directed toward the first reflecting plate. The noise sound waves striking the first reflecting plate are introduced into the inside of a noise-silencing chamber, provided separate from the air passage for taking the outside air in, is silenced, and the air that does not contain the noise sound waves is sent out and the indoor side is ventilated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a ventilator that is attached to a wall surface of a building and ventilates the inside and outside of the building, and particularly relates to a ventilator having a silencing function that reduces noise entering from the outside to the inside of the building through a vent.

Conventionally, there are Patent Documents 1 and 2 as prior arts for preventing unnecessary sound from entering while ventilating a building. In Patent Document 1, a door frame is provided with a ventilation opening, and by providing a plurality of shielding plates in the ventilation opening so as to form a meandering ventilation passage, sound in the room leaks to the next room through the ventilation opening. Is preventing. Further, Patent Document 2 is provided with a ventilation opening on a wall, and the position of the ventilation opening formed in one room is shifted up and down from the position of the ventilation opening formed in the other room. By arranging so as not to overlap, sound leakage to the next room is prevented.
JP 62-29691 A JP 57-122234 A

  In the preceding example, a sound absorbing material is attached to the inner wall of the meandering ventilation passage, and noise energy is reduced by causing the sound absorbing material to absorb sound in the process of noise sound waves being transmitted through the ventilation passage. Therefore, in order to obtain a high silencing effect, a long ventilation passage is required, and there is a problem that the size of the silencing mechanism increases. In order to ensure the length of the ventilation passage, if it is meandered in the thickness direction of the door or wall, the protruding dimension from the door / wall will be larger, and if it is meandered in the height direction of the door / wall, the surface area of the door / wall will be increased. However, the ratio occupied by the silencer mechanism increases. Further, as the length of the ventilation passage is lengthened or meandered, the resistance associated with ventilation increases and the efficiency of ventilation decreases.

  The present invention has been made in response to the problems of the above-mentioned prior examples, and in a ventilation device that is attached to the wall of a building and ventilates the inside and outside of the building, it has good ventilation without requiring a long ventilation passage. The issue is whether it is possible to provide a ventilation device with sound insulation while ensuring it.

  In order to solve the above-described problems, the present invention provides a ventilation device that includes an air passage that communicates between the outside and the inside of the room, ventilates through the air passage, and prevents noise from entering the room from the outside. An outdoor ventilation opening that opens toward the interior, an indoor ventilation opening that opens toward the interior of the room, an air passage formed between the outdoor ventilation opening and the indoor ventilation opening, and an interior of the wall constituting the ventilation path. A space of a predetermined volume is formed, and a sound-absorbing chamber in which the sound-absorbing material is accommodated is provided in a part of the wall constituting the air passage, and the sound-absorbing chamber inside the wall and the air passage are communicated with each other. And a first reflection plate having a curved shape attached from the vicinity of the opening edge of the outdoor ventilation opening to the opening of the noise reduction room, a first reflection plate provided at a position inside the air passage and facing the outdoor ventilation opening. And 2 reflectors, the outdoor passage Noise sound waves entering the inside of the ventilator through the mouth are reflected to the inside of the ventilator while reflecting part of the sound waves to the outside of the ventilator by the second reflector, and the noise sound waves reflected to the inside of the ventilator are reflected on the first reflector. The ventilation apparatus characterized by reducing a noise sound pressure by introduce | transducing into the said muffling room | chamber via is proposed.

  The cross-sectional shape of the first reflector is preferably an ellipse, and the cross-sectional shape of the second reflector is preferably a parabola or a circle. Moreover, you may comprise with the flat plate which bent the 2nd reflecting plate.

  Then, it is desirable that at least one of the elliptical focal points formed by the first reflecting plate is aligned with the position of the muffler chamber opening. In addition, when the cross-sectional shape of the second reflector is a parabola or a circle, it is desirable that the focal point of the parabola and the center point of the circle are respectively adjusted to the position of the outdoor vent.

  In the present invention, the structure in which the first reflector and the second reflector are combined, and the sound wave that reaches the ventilator from an external noise source and enters from the outdoor vent is reflected by the second reflector and is outdoors. The part that comes out again from the ventilation port is first excluded to the outside of the apparatus, and the part reflected to the inside of the apparatus by the second reflector is introduced into the silencer chamber. Then, air from which the energy of noise sound waves has been sufficiently removed flows through the ventilation path and reaches the room from the indoor ventilation opening, thereby ventilating the inside and outside of the room. Therefore, a long air passage with a sound absorbing material attached as in the prior art becomes unnecessary, and the size of the apparatus can be further reduced. In addition, since the sound deadening chamber is provided separately from the air passage, the air passage can be made at a short distance, and it is not necessary to have a meandering shape, thereby improving the ventilation efficiency.

  In addition, by making the cross-sectional shape of the first reflector plate an ellipse and adjusting one of its focal points to the position of the muffler chamber opening, the noise sound wave that enters from the outdoor vent and is reflected to the inside of the apparatus by the second reflector plate is effective. Therefore, the sound can be guided to the inside of the sound deadening chamber, and a higher sound deadening effect can be obtained.

  Moreover, by making the cross-sectional shape of the second reflector a parabola and adjusting the focal point to the position of the outdoor vent, the noise sound wave that enters from the outdoor vent as a parallel wave is collected at the focal point of the parabola and efficiently sent to the outside of the apparatus. Can be reflected.

  Further, by making the cross-sectional shape of the second reflecting plate a circle and adjusting its center point to the position of the outdoor vent, the noise sound wave that enters as a spherical wave from the outdoor vent is collected at the center point of the circle and sent to the outside of the apparatus. It can be reflected efficiently.

Further, by configuring the second reflector plate as a bent flat plate, the noise sound wave that enters the vertical direction from the outdoor vent to the flat plate is reflected toward the direction of the noise source, and the noise sound wave that enters the flat plate obliquely. It can be reflected in the direction of the reflector and guided to the muffler chamber.
Preferred embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an explanatory view showing a state in which a ventilation device according to the first embodiment of the present invention is actually installed. As shown in the figure, a ventilator 1 according to the present invention is provided in the vicinity of a fixed window (so-called fitted window) 3 provided on a wall 2 and not having an opening / closing structure, and is used to prevent the outside air from flowing into the room for the purpose of preventing condensation. Used to ventilate and ventilate. The figure shows a state viewed from the indoor side, and a horizontally long indoor ventilation port appears along the lower edge of the fixed window. Although not shown in the drawing, an opening / closing flap is provided inside the wall of the indoor ventilation opening, and the presence / absence of ventilation can be switched by opening / closing with a flap opening / closing lever.

  Next, the internal structure of the ventilation device 1 will be described in detail with reference to FIG. FIG. 2 is an explanatory view of a cross section in the short-side direction of the ventilation device shown in FIG. 1 as viewed from the right side. Reference numeral 5 denotes a hollow main body casing made of an extruded material such as aluminum, and forms a main body portion of the ventilation device continuously in the longitudinal direction shown in FIG. A sound absorbing material 6 made of a porous material or a fiber material such as glass wool or rock wool is attached to the hollow space to constitute a sound deadening chamber 7 (details will be described later). Reference numeral 8 denotes an outdoor ventilation opening, which opens to the outside of the wall 2 shown in FIG. 1 and functions as an outside air intake for introducing outside air into the room. On the other hand, 9 is an indoor vent opening to the indoor side, and the outside air taken in from the outdoor vent 8 is sent out indoors through the indoor vent. Reference numeral 10 denotes an air passage that connects the outdoor air vent 8 and the indoor air vent 9. The outdoor air vent 8, the air passage 10, and the indoor air vent 9 form a flow path of outdoor air from the outside to the room. Reference numeral 11 denotes a sound wave reflection plate as a second reflection plate, the cross-sectional shape of which is formed so as to draw a parabola, the concave surface of the parabola is opposed to the outdoor vent 8 and the focal point (F1) of the parabola is the outdoor vent. It is fixed in a posture that overlaps with the position 8.

  By the way, the inner wall surface of the main casing 5 corresponding to the peripheral wall surface of the air passage 10 is provided with a sound deadening chamber opening 12 near the end of the sound wave reflection plate 11. The chamber 7 is in communication with each other. A sound wave introducing plate 13 as a first reflecting plate is attached from the opening edge of the outdoor vent to the sound deadening chamber opening 12. The sound wave introduction plate 13 is formed so that its cross-sectional shape draws an elliptic curve, the ellipse concave surface faces the concave surface of the sound wave reflection plate 11, and one of the focal points (f1) of the elliptic curve is It is fixed in a positional relationship overlapping with the position of the muffler chamber opening 12.

  Reference numeral 14 denotes a partition wall formed from the vicinity of the top portion on the convex surface side of the sound wave reflection plate 11 toward the outdoor vent 9. In the ventilator according to the present invention, the ventilator is configured to be symmetrical with respect to the line connecting the centers of the outdoor vent 8 and the indoor vent 9 as an axis of symmetry. Forming. An opening / closing flap 15 is rotatably attached from the vicinity of the indoor vent 9 to the end of the partition wall 14 so that the two ventilation paths formed in the ventilation device can be opened and closed simultaneously. The opening / closing flap 15 is provided with a pivot shaft on the side close to the indoor vent 9, and the flap opening / closing lever moves between the main casing 2 and the partition wall 14 by operating a flap opening / closing lever (not shown), The air passage is opened at the position where it abuts against the casing 2 (dotted line position in the figure), and the air passage is closed at the position where the flap tip abuts against the partition wall 14 (practical position in the figure). The movable opening / closing flap 15 is covered by a vent cover 16 having a slit corresponding to the indoor vent 9 and is not directly exposed to the indoor side in a normal use state.

  Next, the operation of the ventilator according to the present invention will be described. When noise sound waves that have arrived from the noise source enter the inside of the ventilator from the outdoor vent 8, they first hit the concave surface of the sound wave reflector 11 and cause reflection, and part of them return from the outdoor vent 8 toward the outside of the ventilator. The part that is not reflected outside the device causes reflection inside the device. At that time, since the sound wave reflection plate 11 has a parabolic cross-sectional shape, noise sound waves that enter as a parallel wave from the front side with respect to the outdoor vent 8 are particularly focused on the focal point (F1) located at the outdoor vent. It can be collected and efficiently reflected outside the device. On the other hand, the noise sound wave reflected on the inside of the ventilator strikes the sound wave introduction plate 13 to be reflected to the focal point (f1) and is introduced into the silencer chamber 7 through the silencer chamber opening 12 where the focal point (f1) is located. Noise sound waves that have entered the sound deadening chamber 7 are diffused in the sound deadening chamber so that the reflected waves cancel each other's energy, or the energy of the sound waves is reduced by the action of the sound absorbing material 10. The energy is greatly reduced and the sound is muted. In a state where the opening / closing flap 15 is in contact with the partition wall 14 and the air passage is closed, the quietness in the room is combined with the effect of preventing noise from entering the room by closing the flap and the above-described sound deadening effect by the sound deadening room 7. Will result in higher growth. Further, in the state where the opening / closing flap 15 is in contact with the main casing 5 and the air passage is opened, the noise is silenced by the action of the noise reduction chamber 7 as described above, and the outside air from which the noise has been sufficiently removed passes through the air passage 10. It flows and flows into the room from the indoor vent 9. Of course, it is not possible to take all of the sound waves that enter from the outdoor vent 8 and reflect inside the ventilator into the silencing chamber 7, and the noise waves that are not captured and leaked into the room through the indoor vent 9. However, since the noise energy of the noise entering from the outdoor vent 8 is greatly reduced, a sufficient silencing effect can be obtained.

  Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment is different from the first embodiment in that the cross-sectional shape of the sound wave reflection plate 17 serving as the second reflection plate is a circle, and the other structure is the same as that of the first embodiment. Then, by aligning the center point (F2) of the circle of the sound wave reflection plate 17 with the position of the outdoor vent 8, when the noise sound wave coming from the noise source enters the apparatus from the outdoor vent 8 in a spherical wave state, The incoming sound wave can be reflected to the center point and efficiently reflected to the outside of the apparatus.

  Next, a third embodiment of the present invention will be described with reference to FIG. The third embodiment is different from the first and second embodiments described above in that the sound wave reflecting plate 18 as a second reflecting plate is formed by a bent plate, and the others are the first and second embodiments. The structure is the same as that of the second embodiment. In this way, the outdoor ventilation port can also be installed by making the plane portion of the sound wave reflection plate 18 face the outdoor ventilation port 8 so that both sides of the sound wave reflection plate 18 are flipped up at a predetermined angle. The noise sound wave entering from 8 can be guided to the sound deadening chamber 7 inside the apparatus while being reflected to the outside of the apparatus.

It is explanatory drawing which shows the installation state of the ventilation apparatus concerning this invention Example. It is explanatory drawing which shows the cross section of 1st Example of this invention. It is explanatory drawing which shows the cross section of 2nd Example of this invention. It is explanatory drawing which shows the cross section of 3rd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ventilator main body 5 Main body casing 7 Silencer room 8 Outdoor ventilation port 9 Outdoor ventilation port 10 Ventilation path 11 Sound wave reflection plate which is the 2nd reflection plate 12 Sound absorption chamber opening 13 Sound wave introduction plate which is the 1st reflection plate 14 Partition 15 Opening and closing flap 16 Ventilation Mouth cover 17 Sonic reflector with circular cross section 18 Sonic reflector made up of folded flat plate

Claims (8)

In a ventilator that has an air passage that communicates between the outside and the room, ventilates through the air passage, and prevents noise from entering the room from the outside.
An outdoor vent opening to the outside,
An indoor ventilation opening that opens into the room;
A ventilation path formed between the outdoor vent and the indoor vent;
A space of a predetermined volume is formed inside the wall constituting the air passage, and a sound deadening chamber containing a sound absorbing material inside the space;
A silencing chamber opening provided in a part of the wall constituting the vent passage, and communicating the silencing chamber inside the wall with the vent passage;
A first reflector having a curved shape attached from the vicinity of an opening edge of the outdoor vent to the opening of the muffler chamber;
A second reflector provided on the inner side of the air passage and at a position facing the outdoor vent,
A part of the sound wave that enters the ventilator through the outdoor vent is reflected by the second reflector to the outside of the ventilator while the rest is reflected to the inside of the ventilator. A ventilator characterized by reducing noise and sound pressure by being introduced into the muffler chamber through a reflector.   The ventilator according to claim 1, wherein a cross-sectional shape of the first reflector is an ellipse.   The ventilator according to claim 1 or 2, wherein the cross-sectional shape of the second reflector is a parabola.   The ventilator according to claim 1 or 2, wherein the second reflector has a circular cross-sectional shape.   The ventilator according to claim 1 or 2, wherein the ventilator is constituted by a flat plate obtained by bending the second reflecting plate.   The ventilator according to claim 2, wherein at least one of the focal points of the ellipse of the first reflector is aligned with the position of the muffler chamber opening.   4. The ventilator according to claim 3, wherein the parabola of the second reflector is focused on the outdoor vent.   The ventilator according to claim 4, wherein a center point of a circle of the second reflector is matched with a position of the outdoor vent.

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