JP2005308976A - Noise reduction louver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noise reduction louver capable of effectively preventing rain water from entering. <P>SOLUTION: This noise reduction louver is built by using a frame 1, an outside sound absorbing material 2 filled in it, and an inner sound absorbing material 3. The outer sound absorbing material 2 has a protruding surface 21 projecting in the direction Y<SB>1</SB>of the outside 100 from the house, the recessed outside surface 22 of the same shape, their outer joint 23, and the outer sound absorbing material 24 filled in them. The inner sound absorbing material 3 has the same shape as the outer sound absorbing material 2, and is positioned by reversing and shifting one half pitch in the X direction with a space kept in the Y direction and is provided with ridges 35 on both ends of the recessed surface 32. Since the inner recessed surface 32 inclines from X to Y<SB>1</SB>direction to stop the rain water and drops it down, the rain water can be completely prevented from entering the house 200 from the outside 100. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a muffler louver formed so that air can pass from the inside to the outside, and more particularly to a technique for preventing rainwater from entering.

  As a vertical silencing louver that can prevent rainwater intrusion with an outdoor installation type, the cross section is a `` K '' shape in the direction of air flow, and the shape is a key shape with the plate folded back at the tip In general, a structure in which a plurality of sound absorbers provided with a water drainer are arranged in parallel in a case is well known (see the prior art in Patent Document 1).

In Patent Document 1, such a conventional silencing louver having a general structure, a top surface portion that is flat in the lateral direction opposite to the flow direction, and a long inclined portion and a short inclined portion that are inclined to both sides thereof and a long length. The blades that are provided with a sound absorbing material inside are provided with a rear plate extending laterally from the inclined portion, a short inclined portion, and a drainer formed in a folded shape from the end of the rear plate portion, and spaced laterally. A special type of vertical soundproof and waterproof galleries have been proposed in which a plurality of panels are arranged side by side.
JP-A-4-194186 (FIGS. 2, 5 and related explanation)

  However, in the silencer louver with the above general structure, the air is only bent in the shape of "<" and passes, so that the sound absorption performance is low and the effect of preventing rainwater from entering the indoors is low. The key-shaped drainer is installed to stop the intrusion of rainwater alone, increasing the pressure loss of the passing air and increasing the self-noise that is generated when the air passes. In order to increase the air flow direction indoors due to drift in the bending direction of the character, and to improve the sound absorption performance and rainwater intrusion prevention effect, the thickness dimension that is the dimension in the air passing direction in the silencing louver is set. There are various problems, such as the need to enlarge.

  Further, in the specially structured gallery of the above-mentioned patent document, a concave portion is formed on the back surface of the top surface portion or the inclined portion, and the sound absorption effect is enhanced in this portion, and there is a bent portion extending from the long inclined portion to the large rear plate portion. The water trapping property of the water return protrusion is improved. However, in such a silencing louver, since the air passage length is short, the sound absorption performance and rainwater ingress prevention performance are insufficient, the air flow is not smooth, and the drainage is folded back. Although the passage length is short, there are various problems such as large air resistance, large self-noise at the draining portion, and air drift.

  Accordingly, an object of the present invention is to solve the above-mentioned problems in the prior art and provide a sound deadening louver capable of improving sound absorption performance and rainwater intrusion prevention performance and reducing pressure loss without increasing the size.

In order to solve the above-mentioned problems, the present invention provides a silencing louver formed so that air can pass from outside to inside.
A frame member, and a plurality of outer sound absorbers and inner sound absorbers arranged in the frame member at the same pitch in the horizontal direction perpendicular to the vertical inner direction, which is the inner direction from the outside, at the same pitch. The outer sound absorber is a continuous line on each side symmetrical so that the cross section is symmetrical in the lateral direction and convex in the longitudinal inside and outside direction opposite to the longitudinal outside and inside direction. The outer convex portion and the outer concave portion provided in the same shape as the outer convex portion and spaced apart from the outer convex portion in the longitudinal outer inward direction, and the outer coupling portion that couples the outer concave portion and the outer convex portion. And an outer sound absorbing material placed in a portion surrounded by the outer coupling portion, the outer convex surface portion, and the outer concave surface portion, and the inner sound absorbing member is obtained by inverting the outer sound absorbing member by 180 °. The pitch of the outer sound absorber is spaced apart from the outer sound absorber in the longitudinally outer direction. The inner convex surface portion, the inner concave surface portion, the inner coupling portion, and the inner sound absorbing material corresponding to the outer convex surface portion, the outer concave surface portion, the outer coupling portion, and the outer sound absorbing material. A drainer is provided so as to be able to stop rainwater that may enter from the outside at both lateral positions of the inner concave surface portion.

  The invention of claim 2 is characterized in that, in addition to the above, the drainer is formed in the shape of an extended portion obtained by extending the inner coupling portion in the longitudinal inside / outside direction.

According to the present invention, the following effects are achieved in the first aspect of the present invention.
In a silencer louver formed so that air can pass outside, for example, from inside to outside, for example, indoors, a plurality of outer sound absorbers and inner sound absorbers are placed in the frame member from outside to inside in the longitudinal outside direction (hereinafter “Y”). Are arranged at the same pitch in the lateral direction (hereinafter referred to as “X direction”) perpendicular to the direction)), so that air may pass through the laterally spaced portions of the outer sound absorber and the inner sound absorber. it can.

Outer sound absorbing body has an outer convex surface cross-section is in line each side symmetrical are continuous so that the convex outside of the vertical inner and outer direction from an indoor (hereinafter referred to as "Y ₁ direction") symmetrical to the X-direction When the air is taken in from outside, the outside convex surface part that is convexly continuous becomes the air guide surface, while the laterally spaced part becomes the first air passage, and the air is removed from the outdoor side of the sound deadening louver. The entire portion can be smoothly introduced into the laterally spaced portions of the plurality of outer sound absorbers. At this time, if it is raining outside, the rainwater hits the outer convex surface portion and is accompanied by air and enters the silencing louver from the laterally spaced portion.

  This outer sound absorber has the same shape as the outer convex surface portion and is provided in the Y direction away from the outer concave surface portion, and the outer concave surface portion in which the outer surface facing the interior is concave, and the outer concave and convex surface portions are coupled to each other. And a laterally spaced portion is formed by the outer coupling portion. In addition, the inner sound absorber is arranged by inverting the outer sound absorber by 180 ° and spaced from the outer sound absorber in the Y direction by a half pitch from the pitch, and is connected to the outer convex surface portion and the outer concave surface portion. Since the inner convex surface portion, the inner concave surface portion, the inner coupling portion, and the inner sound absorbing material respectively corresponding to the outer sound absorbing material and the outer sound absorbing material are provided, the laterally spaced portion of the outer sound absorbing body has a center of the inner concave surface portion in the Y direction. The portions are opposed to each other, and the laterally spaced portion of the inner sound absorber is opposed to the central portion of the outer concave surface portion in the Y direction.

As a result, the air that has passed through the laterally spaced portion of the outer sound absorber travels in the Y direction so as to hit the central portion of the inner concave portion of the inner sound absorber, and is guided to the outer concave portion and the inner concave portion that are separated in the Y direction. It flows through the vertical interval between them. These inner and outer concave portions and the vertical interval portion is oriented from the central part in symmetrical on both sides in the X direction in the Y ₁ direction is the direction back to the outdoor side from the opposite indoor Y direction. By such an air flow entering the vertical interval portion from the horizontal interval portion, the rain water accompanying the air linearly hits the inner concave portion by the velocity component in the Y direction, or is bent by the air flow and hits the inner concave portion. . In addition, the rainwater that has traveled in the Y direction through the outer coupling portion by the air flow without falling downward among the rainwater hitting the outer convex surface portion is blown from the outer coupling portion and accompanied by the air and passes through the laterally spaced portion. It hits the inner concave surface as well as rainwater.

In this case, the inner concave surface portion as described above is to have an inclination to return to the Y ₁ direction, invading rainwater attached thereto hit almost certainly inside the concave portion. And most of the rainwater hitting the inner concave surface from various paths in this way has no velocity component in the direction along the surface of the inner concave surface, and also does not receive much bent air conveying force. It falls downward without moving laterally along the concave surface.

A part of the rainwater having a small diameter is blown to a position far away from the central portion of the inner concave portion by the air conveying force and hits the inner concave portion. And further, this rainwater is likely to move laterally along the inner concave portion receives a conveying force by air, with the inner concave portion is inclined in the Y ₁ direction, the inner concave surface to the mobile In order to receive viscous frictional resistance from the wall surface of the part, the moving force of rainwater that moves in the X direction on the wall surface of the inner concave surface part is sufficiently small.

  In this way, against the possibility that some rainwater hits the inner concave surface and moves to both ends in the X direction without falling, stop rainwater that may enter from the outside at both ends in the X direction of the inner concave surface Since the possible draining is provided, it is possible to stop the movement of such rainwater and further drop it from the position without moving it further in the X direction and re-scattering it into the air flow. In this case, as described above, the moving force of the rainwater in the X direction at the inner concave surface portion is sufficiently weakened, so that the rainwater can be easily stopped by draining the water in an appropriate shape with a small size. As a result, there is no rainwater passing through the laterally spaced portion of the inner sound absorbing member, and rainwater can be prevented from entering indoors almost completely. In addition, the above-described effect of preventing rainwater from entering can be achieved without increasing the thickness dimension of the silencing louver in the Y direction.

  On the other hand, as described above, the air passes through the outer laterally spaced portion from the outer convex surface portion, and is diverted in the X direction, passes through the longitudinally spaced portion of the inner and outer sound absorbers, joins at the central portion, and becomes the laterally spaced portion of the inner sound absorber. The air flows directly into the indoor space, and flows into the indoor space while bending in the direction of both inner convex portions, and flows out uniformly and without drifting as a whole. Since the inner and outer sound absorbers are provided with a sound absorbing material, noise generated mainly indoors through such an air flow is absorbed by the sound absorber and reflected indoors. As a result, the amount of noise radiated to the outdoor side can be sufficiently reduced.

  Further, in this silencer louver, air joins and splits on the surface of the outer and inner sound absorbers, and then joins and flows again, so that the length of the sound absorbing surface of the sound absorbing material becomes longer and the sound absorbing area becomes larger. In addition, the characteristic shape of the plurality of external sound absorbers and the effect of their combination eliminates the need to provide a large drainer facing in the opposite direction of the air flow in order to prevent rainwater from entering. Generation of large self-noise due to draining can be eliminated. As a result, it is possible to very effectively prevent noise from being released to the outside without increasing the thickness of the silencing louver in the Y direction.

In the invention of claim 2, because it has a water drainage portion which is formed in the shape of an extension portion of the inner sound absorber has extended the inner coupling portion to the outer direction, rainwater is not oriented in Y ₁ direction is a certain degree weather side Since the inner concave part that is difficult to transmit is completely directed in the Y ₁ direction, the draining part completely prevents the lateral movement of rainwater and completely prevents rainwater from entering the indoors. can do.

On the other hand, the draining portion having such a shape is directed not in the reverse direction but in the forward direction with respect to the Y ₁ direction of the longitudinal interval portion through which the air flows. Can be minimized, and a sufficient noise prevention effect can be achieved.

FIG. 1 shows an example of the overall structure of a silencing louver to which the present invention is applied, and FIG. 2 shows the sound absorbing portion.
The silencing louver of this example is formed so that air can pass from the outdoor 100, which is outside, to the indoor 200, which is the inside, and includes a frame member 1, an outer sound absorber 2, and an inner sound absorber 3. The frame member 1 has a structure formed by joining vertical groove members 11 on both sides and upper and lower horizontal groove members 12 for attachment to a wall surface or the like of a building. The portions surrounded by the bottom plates 11a and 12a of the respective members are open, and the sound absorbers 2 and 3 are placed therein, and the upper and lower ends thereof are coupled to the upper and lower bottom plates 12a, thereby allowing ventilation of buildings and the like. A muffler louver is formed.

  The outer sound absorbing body 2 and the inner sound absorbing body 3 are in the lateral direction perpendicular to the Y direction shown in the figure, which is the direction from the outdoor 100 to the indoor 200 as the longitudinal outer direction, which is the inner direction from the outside in the frame member 1. In the present example, three bodies are arranged as a plurality with a horizontal interval d at the same pitch p in the direction. Either the outer sound absorber 2 or the inner sound absorber 3 arranged at both ends in the X direction is made almost half so as to form an air passage similar to that of the intermediate portion. The inner sound absorber 3 is formed as a half. At both ends of the outer sound absorber 2, a lateral distance d / 2 between both ends is provided between the outer sound absorber 2 and the bottom plate 11a of the longitudinal groove member 11 as a distance corresponding to the lateral distance. Needless to say, the outer sound absorber 2 and the inner sound absorber 3 may be interchanged in the Y direction.

In this example, the outer sound absorber 2 is a line in which the cross-sections are symmetrical in the horizontal X direction and are symmetrical in the Y ₁ direction, which is the longitudinal inner and outer direction opposite to the Y direction, and are continuous in the X direction in this example. The outer convex surface portion 21 that is an inclined straight line, the outer concave surface portion 22 that has the same shape as the outer convex surface portion 21 and is provided away from the outer convex surface portion 21, and the outer concave and convex surface portions 22 and 21 are coupled to each other. 23 and an outer sound absorbing material 24 put in a portion surrounded by these portions 21, 22, 23.

  The inner angle θ of the inclined straight line that forms an equilateral mountain shape of the outer convex surface portion 21 may be any angle as long as it has a good effect of preventing rainwater intrusion and can smoothly introduce air from the outdoor 100 to the indoor 200 as will be described later. Is suitable, but can be in the range of about 90 ° to 150 °. The outer convex surface portion 21 and the outer coupling portion 23 are usually solid plates such as steel plates so that rainwater does not enter the inside of the outer sound absorbing material 24. Since the inner convex surface portion 22 hardly receives rainwater, the inner convex surface portion 22 is made of a porous plate so as to have good sound absorption. The outer sound-absorbing material 24 has a normal structure in which, for example, glass wool is covered with a water-repellent coating material that is appropriately opened.

  The inner sound absorber 3 is arranged by inverting the outer sound absorber by 180 °, and is shifted by a half pitch p / 2 from the pitch p of the outer sound absorber 2 with a vertical interval h in the Y direction. Are provided with an inner convex surface portion 31, an inner concave surface portion 32, an inner coupling portion 33, and an inner sound absorbing material 34.

Drainers 35 are provided at both end positions in the X direction of the inner concave surface portion 32 so as to be able to stop rainwater that may enter from the outdoor 100. The draining 35 is, in this example, is formed an inner coupling part 33 in the shape of an extension portion that extends in the Y ₁ direction. Such a draining portion 35 is easily formed by bending the inner concave surface portion 32 made of a solid steel plate in the extending direction of the inner coupling portion 33. Further, this portion may be used as a drainer 35 leaving a portion that does not open in the porous plate of the inner coupling portion 33 made of a porous plate.

The silencing louver as described above is used as follows to exert its operational effects.
As shown in FIG. 3, when air is taken from the outdoor 100 into the indoor 200, the outer convex surface portion 21 that forms the outer sound absorber 2 is convex toward the outdoor 100, and the tip of the Y direction at the front end thereof. Since the portion of the lateral distance d becomes the air inlet passage 4, the air flows uniformly and smoothly into the inlet passage 4 from the entire X direction of the silencing louver as indicated by the arrow in the air flow direction. At this time, if it is raining outdoors 100, the rain water w hits the outer convex surface portion 21 and adheres to the outer convex surface portion 21 and also enters the sound deadening louver directly from the entrance passage 4 along with the air.

The air that has passed through the inlet passage 4 advances in the Y direction so as to hit the central portion of the inner concave surface portion 32 of the inner sound absorber 3, and is formed by the inner and outer concave surface portions 32 and 22, which is the direction from the X direction to the Y ₁ direction. In this example, the vehicle enters the intermediate passage 5 formed in the return inclination direction indicated by the arrow D inclined by 30 ° in the direction returning to the outdoor 100.

  Due to the air flow entering the intermediate passage 5 from the inlet passage 4 as shown in FIG. 4A, the rain water w accompanying the air is linearly shown by a solid line arrow by the velocity component in the Y direction. It hits the inner concave surface portion 32 or is bent by the air flow as shown by the two-dot chain line arrow, and hits the inner concave surface portion. In addition, a part of the rainwater that has traveled in the Y direction through the outer coupling portion 23 by the air flow without falling downward among the rainwater hitting the outer convex surface portion 21 is separated from the outer coupling portion 23 and is accompanied by air, Similar to the rainwater that has passed through the entrance passage 4, it hits the inner concave portion 32.

  In this case, since the inner concave surface portion 32 is inclined by 30 ° to receive intrusion of rainwater, the intruded rainwater is separated from the air flow and almost certainly hits the inner concave surface portion 32. In this way, most of the rainwater that hits and adheres to the inner concave surface portion 32 from various paths has a velocity component that is perpendicular to the surface of the inner concave surface portion 32 or toward the center direction when hitting. Since there is no velocity component in the D direction along the surface, if the velocity of the passing air is a normal velocity of about 2 to 3 m / sec or less at the inlet cross section of the silencer louver, the inner concave surface is further increased by the air conveying force. It does not move in the X direction along the surface of the portion 32, stops on the inner concave surface portion 32, aggregates to some extent and falls downward.

  On the other hand, a part of rainwater having a small diameter or a part in the vicinity of both ends of the inlet passage 4, as shown in FIG. 4 (b), is located far from the center of the inner concave surface portion 32 by the air conveying force. It is skipped and hits that part. As shown by the arrows, the rainwater may further move in the direction of the end thereof along the inner concave surface portion 32 by receiving the air conveying force. However, the inner concave surface portion 32 is inclined upward with respect to the movement. Since the viscous frictional force acts on the rainwater from the surface of the inner concave surface portion 32 so as to stop the movement, the force for moving the rainwater is sufficiently small.

As a result, when rainwater that may travel to the end of the inner concave portion 32 in this way hits a drainer 35 that faces in the Y ₁ direction, it further changes direction from the D direction to the Y ₁ direction. It stops at that position, stops at that position, falls appropriately and then drops downward. Further, as shown by a two-dot chain line, there is a possibility that the rainwater that has passed through the inlet passage 4 is blown to the inner concave surface portion 32 by the air flow, but at that time, such rainwater directly hits the drainer 35 and is captured. Is done. Therefore, water droplets that have been blown to the end of the inner concave surface portion 32 by the air flow due to a small diameter of rainwater or the like can be reliably received and dropped at that portion without being scattered in the air.

  As a result, there is no rainwater that passes through the outlet passage 6 that is a laterally spaced portion of the inner sound absorbing portion 32 and enters the backside 200, and the intrusion of rainwater to the indoor side is almost completely prevented. In addition, the above-described effect of preventing rainwater from entering can be achieved without increasing the thickness dimension of the silencing louver in the Y direction.

  On the other hand, as shown in FIG. 3, the air gathers while being guided by the outer convex surface portion 21 and enters the inlet passage 4, and after being diverted in the lateral direction, passes through the intermediate passage 5 and the central portion of the outer concave surface portion 22. And flows into the outlet passage 6 and directly flows into the indoor 200, and flows into the indoor side while turning in the direction of both inner convex surfaces 32, and is uniformly indoor as a whole as indicated by the arrow on the last flow side. To 200. Since the inner and outer sound absorbers 2 and 3 are provided with the sound absorbing materials 24 and 34, the noise generated mainly on the indoor side through such an air flow is absorbed by the sound absorbing material and reflected to the indoor side. The As a result, noise diffused outdoors 100 can be sufficiently reduced.

  Further, in this silencing louver, since the air joins and splits on the surface of the outer and inner sound absorbers, and then joins again, it spreads and flows on the inner convex surface part 31, so that the air passage length is long, so the sound absorbing The sound absorption area of the material is large. In addition, since the effect of the reverse inclination of the inner concave surface portion 32 is great, it is not necessary to provide a drainer that normally faces in the opposite direction of the air flow in order to prevent the intrusion of rainwater. There is no occurrence. As a result, it is possible to very effectively prevent noise from being released to the outside without increasing the thickness of the silencing louver in the Y direction.

Incidentally, the draining 35 as in this embodiment if those Y ₁ direction of narrow protruding suitable length tabular facilitates manufacture as draining with sound-absorbent material. The drainer 35 is directed in the direction of bending the air flow like the guide plate with respect to the D direction in which the air flows, but does not face in the opposite direction of the air flow, and thus does not generate a large self-noise. . As a result, the rainwater intrusion prevention effect and the silencing effect can be efficiently obtained by the combination with the shape of the sound absorber. However, it is possible to make such a plate-like draining obtained by changing some angle from Y ₁ direction. In addition, when a certain amount of self-noise increase is allowed in relation to the desired noise reduction effect, the effect of preventing rainwater intrusion can be further improved with an L shape or key shape with a small bend. It is also possible to adopt a drainer having a characteristic shape.

FIG. 5 shows still another example of the silencing louver to which the present invention is applied.
The silencing louver of this example is different from that of FIG. 1 in that the cross section of the outer and inner convex surface portions 21 and 31 of the outer and inner sound absorbers 2 and 3 is not an equilateral mountain-shaped inclined straight line but symmetrical in the X direction. The difference is that each symmetrical side is formed in a circular arc as a continuous line so as to be convex in the direction of Y ₁ . Other structures are the same as those in FIGS. 1 and 5, and the illustration of the sound absorbing material is omitted in the drawings. In the silencing louver of this example as well, as in the case of FIG. 1, the air uniformly flows out into the interior 200 without drifting so as to gather, join, split, join, and disperse, A silencing effect can be obtained.

The inventors made a prototype of the silencing louver shown in FIG. 1 to which the present invention was applied, and performed a comparative test of the conventional normal silencing louver and rainwater invasion preventing effect, silencing effect, pressure loss, etc. using the test apparatus shown in FIG. Carried out.
1. Dimensions, shape, etc. of the silencing louver (1) of the embodiment to which the present invention is applied Opening size and depth of the opening: width 750 mm × height 900 mm × depth 250 mm
Sound absorber dimensions:
Vertex angle of uneven surface part: 120 ° (tilt angle 30 °)
Length of both sides inclined surface ； 100mm
Distance between uneven slopes: 50mm
Pitch in X direction: 250mm
Interval in the Y direction of the outer and inner sound absorbers (distance in the Y direction between the outer concave surface portion 22 and the inner concave surface portion 32); y ₁ = 44 mm, (Reference Example 2—y ₂ = 37 mm)
Drainage shape and dimensions Overhang length; l ₁ = 15 mm (Reference Example 1 --- l ₂ = 20 mm)
Bend when L-shaped; (Reference Example 3 --- Bend length 5mm)
Sound absorbing material: glass wool Size, shape, etc. of conventional silencer louver (2) Opening size and depth: Same as above Dimensions of cross-section "<"-shaped sound absorber:
Inclination angle of uneven surface part: 90 ° (projecting in X direction)
Each inclined surface length; 140 mm
Distance between uneven slopes; 70 mm
Pitch in X direction; 140 mm
Drainer shape and dimensions Overhang length in the X direction from the tip of the dogleg; 22 mm
Length folded back Y ₁ side along the dogleg; 18 mm
Sound-absorbing material; Test device and test conditions Wind tunnel 300 for mounting the silencing louvers (1) and (2)
Opening dimension; same length as the sound deadening louver; Total length 2500mm including 1000mm transparent PVC part on the front side
Amount of water sprayed from the watering hose 400 Amount of floor surface diffused water when there is no wind; 0.28 to 0.29 m ³ / h
External fan 500
Diameter: 450 mm
Wind speed: 3-4m / s
Installation position: Position 1250mm away from the silencer louver (1), (2) Internal fan 600 with inverter
Diameter: 600 mm
Velocity average wind speed V at opening: V ₁ = 1 m / s, V ₂ = 2 m / s, V ₃ = 3 m / s
4). Test results are shown in Tables 1 to 5 below.

  According to Tables 1 and 2 showing the examples and comparative examples, the silencing louvers of the examples have a greater effect of preventing rainwater intrusion and less self-noise and pressure loss than the silencing louvers of the comparative examples of the prior art, It has been proved that it is remarkably superior in all characteristics as a silencer louver. That is, in the device of the comparative example, if the drainage is increased in order to increase the rainwater invasion prevention effect, the self noise and pressure loss become larger and become unusable, and conversely, the self noise and pressure loss should be reduced. Although the rainwater intrusion prevention effect is further deteriorated, the silencer louver of the embodiment to which the present invention is applied has good performance and can be used as it is and is extremely practical.

  Tables 3-5 show what changed a part of composition of the silence louver of an example as reference examples 1-3. In Reference Example 1, the length of draining is increased from 15 mm to 20 mm in the example. However, as shown in Tables 1 and 3, the rainwater intrusion prevention effect is the same and self noise and pressure loss are slightly increased. became. Therefore, it was found that about 15 mm is sufficient for draining with the silencing louver having the overall dimensions of this example.

  In Reference Example 2, the distance between the inner and outer sound absorbers in the Y direction is reduced from 44 mm to 37 mm in the example to reduce the depth dimension of the silencing louver, but as shown in Tables 1 and 4, overall performance is improved. Became clear. In Reference Example 3 shown in Table 5, the draining shape was L-shaped, but the rainwater intrusion preventing effect was not better than that of the example, and rather it was lowered. This is considered to be because the longitudinal interval between the inner and outer sound absorbers is narrowed due to the L shape, the air flow rate is increased, and the flow turbulence is increased. Therefore, it has been found that a flat plate like a guide plate is usually better than an L shape or a key shape. In addition, when the depth dimension of the silencing louver is sufficiently large to increase the vertical interval, draining such as L-shaped may be effective.

  As described above, the silencing louver with the overall dimensions of the present example resulted in the best performance as a whole, but the depth dimension of the silencing louver, the dimension and shape of the draining louver, etc. are intended. The rainwater intrusion preventing effect and the silencing effect are obtained, and the size is determined so as to meet the actual conditions so as to be small and simple in structure and low in cost.

  INDUSTRIAL APPLICABILITY The present invention is advantageously used as a silencing louver that takes in air from the outside indoors while preventing rainwater intrusion and noise divergence in buildings such as buildings.

An example of the whole structure of the silencing louver to which this invention is applied is shown, (a) is an aa arrow view of (b), (b) is a front view, (c) is an cc arrow view of (a). FIG. It is sectional drawing of the sound-absorbing body part of the said silencing louver. It is explanatory drawing of the air flow of the said silencing louver. (A) And (b) is explanatory drawing which shows the movement state of the rainwater in the said silencing louver. It is a cross-sectional view which shows the other example of the silencing louver to which this invention is applied. It is explanatory drawing of the apparatus which performs the rainwater penetration | invasion test of a silencing louver.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame member 2 Outer sound absorber 3 Inner sound absorber 21 Outer convex surface part 22 Outer concave surface part 23 Outer coupling part 24 Outer sound absorbing material 31 Inner convex surface part 32 Inner concave surface part 33 Inner coupling part 34 Inner sound absorbing material 35 Drainage 100 Outdoor (outside)
200 Indoor (inside)
d Lateral distance
h Vertical interval p Pitch X Horizontal direction Y Vertical direction, Outdoor to indoor direction (outside to inside direction, vertical outside to inside direction)
Y ₁ vertical inward / outward direction

Claims (2)

In the muffler louver formed so that air can pass from outside to inside,
A frame member, and a plurality of outer sound absorbers and inner sound absorbers arranged in the frame member at the same pitch in the horizontal direction perpendicular to the vertical inner direction, which is the inner direction from the outside, at the same pitch. The outer sound absorber is a continuous line on each side symmetrical so that the cross section is symmetrical in the lateral direction and convex in the longitudinal inside and outside direction opposite to the longitudinal outside and inside direction. The outer convex portion and the outer concave portion provided in the same shape as the outer convex portion and spaced apart from the outer convex portion in the longitudinal outer inward direction, and the outer coupling portion that couples the outer concave portion and the outer convex portion. And an outer sound absorbing material placed in a portion surrounded by the outer coupling portion, the outer convex surface portion, and the outer concave surface portion, and the inner sound absorbing member is obtained by inverting the outer sound absorbing member by 180 °. The pitch of the outer sound absorber is spaced apart from the outer sound absorber in the longitudinally outer direction. The inner convex surface portion, the inner concave surface portion, the inner coupling portion, and the inner sound absorbing material corresponding to the outer convex surface portion, the outer concave surface portion, the outer coupling portion, and the outer sound absorbing material. A muffler louver is provided with drainers so as to be able to stop rainwater that may enter from the outside at both lateral end positions of the inner concave surface portion.   The silencing louver according to claim 1, wherein the drainer is formed in the shape of an extended portion in which the inner coupling portion extends in the longitudinal inside / outside direction.

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