JP2007263466A - Air conditioning duct - Google Patents

Air conditioning duct Download PDF

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Publication number
JP2007263466A
JP2007263466A JP2006088950A JP2006088950A JP2007263466A JP 2007263466 A JP2007263466 A JP 2007263466A JP 2006088950 A JP2006088950 A JP 2006088950A JP 2006088950 A JP2006088950 A JP 2006088950A JP 2007263466 A JP2007263466 A JP 2007263466A
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duct
absorbing member
air
sound absorbing
air conditioning
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Shintaro Okawa
新太朗 大川
Nobuhiro Terai
伸弘 寺井
Shigeru Yabutani
茂 藪谷
Takahiko Sato
貴彦 佐藤
Masahide Ishikawa
雅英 石川
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Toyota Motor Corp
Toyoda Gosei Co Ltd
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Toyota Motor Corp
Toyoda Gosei Co Ltd
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  • Air-Conditioning For Vehicles (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To precisely reduce noise generated from an air conditioning unit through suitable disposition of a sound absorbing member to a duct inner wall surface even in the case of complicated duct structure having a bent part. <P>SOLUTION: A first sound absorbing member 8 for damping vibration energy is provided on the opposite surface of the bent part 6, that is, inside of a slope 6a in an air-conditioning duct 5 seen from the air-conditioning unit side 4. A second sound absorbing member 10 for damping vibration energy is provided in an opposite area 10a of the air-conditioning duct 5 where an incident wave on a first sound absorbing member 8 or the inside of the slope 6a determined depending on the angle of the inclined surface is reflected. The second sound absorbing member 10 is buried in a storing recess 9 so that the surface position is aligned with the wall surface position of the inner wall surface 5a of the air-conditioning duct 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、例えば自動車等の空調装置に用いられる空調ダクトに関し、詳しくは騒音低減のためのダクト構造の改良に関する。   The present invention relates to an air-conditioning duct used for an air-conditioning apparatus such as an automobile, and more particularly to an improvement of a duct structure for noise reduction.

一般に、自動車等の空調装置に用いられる空調ダクトとしては、ポリエチレン等の熱可塑性樹脂をブロー成形したものが使用されている。ただし、このような空調ダクトをそのまま用いたのでは、空調ユニットで発生する騒音や同空調ユニットから送風される空調風に起因して発生する騒音等がダクト内の内壁面で全反射してしまい、車室内へのこうした騒音の伝播が避けられない。そこで従来は、例えば特許文献１に記載の発明のように、空調ダクト内の一部に振動エネルギを減衰させて上記騒音を吸音する吸音部材を設けるようにしたものなども提案されている。
特開平６−１５６０５１号公報 Generally, as an air conditioning duct used for an air conditioner such as an automobile, a blow molded thermoplastic resin such as polyethylene is used. However, if such an air conditioning duct is used as it is, the noise generated by the air conditioning unit and the noise generated by the conditioned air blown from the air conditioning unit are totally reflected by the inner wall surface in the duct. The propagation of such noise into the passenger compartment is inevitable. Therefore, conventionally, as in the invention described in Patent Document 1, for example, a sound absorbing member that attenuates vibration energy and absorbs the noise is provided in a part of the air conditioning duct.
Japanese Patent Laid-Open No. 6-156051

このように、空調ダクトの一部に吸音部材を設けることで、上述した騒音の車室内への伝播は確かに抑制されるようにはなる。ただし、このような吸音部材を設けたとしても、吸音部材が吸音しきれずに反射された騒音はやはり同ダクトの他の内壁面を介して反射を繰り返しつつ空調風の吹出口に至ることとなり、このような場合、十分な低減効果は期待できない。   Thus, by providing the sound absorbing member in a part of the air conditioning duct, the above-described propagation of the noise into the vehicle interior is surely suppressed. However, even if such a sound absorbing member is provided, the noise that is reflected without the sound absorbing member being fully absorbed will still reach the air outlet of the conditioned air while repeatedly reflecting through the other inner wall surface of the duct, In such a case, a sufficient reduction effect cannot be expected.

一方、このような空調ダクトは通常、インストルメントパネル等との設置スペースの兼ね合いで、そのダクト延設方向中ほどで大きく屈曲する形状にて形成されることが多い。また、空調風の円滑な流通等を考慮して、その屈曲面をなだらかな傾斜面とすることも多い。このような場合、上記騒音の伝播態様も自ずと複雑となり、ダクトの内壁面に吸音部材に設けるにせよ、同吸音部材による吸音効果を最大限に活かすことのできる配設箇所となると、その選定も難しい。なお、空調ダクトの内壁面全域に亘って吸音部材を設けることも考えられるが、その場合、吸音部材そのもののコストはもとより、作業工程の増加も避けられず、全体としての生産コストの増大も無視できない。   On the other hand, such an air-conditioning duct is usually formed in a shape that is largely bent in the middle of the duct extending direction in consideration of installation space with an instrument panel or the like. In consideration of smooth circulation of the air-conditioning air, the bent surface is often a gentle inclined surface. In such a case, the noise propagation mode is naturally complicated, and even if the sound absorption member is provided on the inner wall surface of the duct, the selection is also made when the arrangement location can make the best use of the sound absorption effect of the sound absorption member. difficult. It is also possible to provide a sound absorbing member over the entire inner wall surface of the air conditioning duct, but in that case, not only the cost of the sound absorbing member itself, but also an increase in work processes is unavoidable, and the increase in overall production cost is ignored. Can not.

本発明は、上記課題に鑑みてなされたものであり、屈曲部を有する複雑なダクト構造をとる場合であれ、ダクト内壁面に対する吸音部材の適切な配設を通じて空調ユニットから発生される騒音を的確に低減させることのできる空調ダクトを提供することを目的とする。   The present invention has been made in view of the above problems, and even when a complicated duct structure having a bent portion is taken, noise generated from the air conditioning unit is accurately obtained through appropriate arrangement of the sound absorbing member with respect to the inner wall surface of the duct. An object of the present invention is to provide an air conditioning duct that can be reduced.

上記課題を解決するために、請求項１に記載の発明は、空調風を送風する空調ユニットから延設され、途中に屈曲部を有して該空調ユニットから送風される空調風を室内に吹き出す吹出口に至る空調ダクトにおいて、前記空調ユニット側から見たダクト内の屈曲部対向面に振動エネルギを減衰させる第１の吸音部材を備えるとともに、前記屈曲部対向面または第１の吸音部材の面への入射波が反射されるダクト内の対向領域の少なくとも一部に振動エネルギを減衰させる第２の吸音部材を備えることをその要旨とする。   In order to solve the above-mentioned problem, the invention described in claim 1 extends from an air conditioning unit that blows conditioned air, and has a bent portion in the middle to blow out the conditioned air blown from the air conditioning unit into the room. In the air-conditioning duct leading to the air outlet, a first sound-absorbing member that attenuates vibration energy is provided on the surface facing the bent portion in the duct as viewed from the air-conditioning unit side, and the surface facing the bent portion or the first sound-absorbing member The gist of the present invention is to provide a second sound absorbing member for attenuating vibration energy in at least a part of the opposed region in the duct where the incident wave is reflected.

このように途中に屈曲部を有する空調ダクトにあって、空調ユニットから送られる空調風や前述した騒音はまず、空調ユニット側から見たダクト内の屈曲部対向面、すなわち同屈曲部の外側に対応するダクト内の屈曲壁面に当接し、その後、この屈曲部の屈曲形状に沿うかたちで上記吹出口側に流れるようになる。このため、上記空調ユニット側から見たダクト内の屈曲部対向面に対してまずは第１の吸音部材を設けることで上記騒音の吸音が図られ、該騒音の上記吹出口からの流出が抑制緩和される。ただし前述のように、このような吸音部材を設けたとしても上記騒音の全てがそこで吸音（消音）されるとは限らず、通常は、そこで吸音しきれなかった反射波成分が当該ダクトの内壁面で順次反射を繰り返しつつ上記吹出口に至る。   Thus, in the air conditioning duct having a bent portion in the middle, the conditioned air sent from the air conditioning unit and the noise described above are first on the surface facing the bent portion in the duct as viewed from the air conditioning unit side, that is, outside the bent portion. It comes into contact with the bent wall surface in the corresponding duct, and then flows to the outlet side in a form along the bent shape of the bent portion. For this reason, the noise is first absorbed by providing the first sound-absorbing member on the bent portion facing surface in the duct as viewed from the air conditioning unit side, and the outflow of the noise from the air outlet is suppressed and mitigated. Is done. However, as described above, even if such a sound absorbing member is provided, not all of the above noise is absorbed (muted) there. Normally, reflected wave components that could not be absorbed there are contained in the duct. It reaches the above-mentioned outlet while repeating reflection on the wall surface in sequence.

この点、空調ダクトとしての上記構成によれば、こうして第１の吸音部材から反射される騒音成分、すなわち第１の吸音部材では吸音しきれなかった騒音成分（反射波成分）が上記第２の吸音部材、すなわち上記屈曲部対向面または第１の吸音部材への入射波が反射されるダクト内の対向領域の少なくとも一部に設けられた吸音部材にさらに入射され、吸音されることとなるため、第１の吸音部材では吸音しきれなかった騒音成分も、この第２の吸音部材を通じてそのさらなる減衰が図られるようになる。そして、このようなかたちで上記空調ユニットから発せられる騒音の吸音（消音）が図られることで、上記吹出口からの騒音の流出も大きく抑制されるようになる。しかも、同構成によれば、上記吸音部材の配設が必要最小限の箇所で済むことから、生産コストの増大を招くこともない。なおこのことは、上記屈曲部が複数設けられる空調ダクトにあっても基本的に同様であり、上述の原理によればむしろ、このような屈曲部毎に上記吸音構造を採用することで、その吸音（消音）効果もより高められるようになる。また、このように屈曲部が複数設けられる空調ダクトであれ、上記空調ユニット側から見た最初の屈曲部、あるいは任意の１つの屈曲部に対してのみ上記吸音構造を採用する構成としても勿論よい。   In this regard, according to the above configuration as the air conditioning duct, the noise component reflected from the first sound absorbing member, that is, the noise component (reflected wave component) that could not be absorbed by the first sound absorbing member is the second component. Since the sound absorbing member, that is, the sound absorbing member provided in at least a part of the facing region in the duct where the incident wave to the bent portion facing surface or the first sound absorbing member is reflected, is further incident and absorbed. The noise component that could not be absorbed by the first sound absorbing member can be further attenuated through the second sound absorbing member. And since noise absorption (silence) of the noise emitted from the air conditioning unit is achieved in this way, the outflow of noise from the air outlet is greatly suppressed. In addition, according to this configuration, since the arrangement of the sound absorbing member is only required at the minimum necessary location, the production cost is not increased. This is basically the same even in an air-conditioning duct provided with a plurality of bent portions. Rather, according to the principle described above, by adopting the sound absorbing structure for each such bent portion, The sound absorption (silence) effect can be further enhanced. In addition, even in such an air conditioning duct having a plurality of bent portions, the above-described sound absorbing structure may be adopted only for the first bent portion viewed from the air conditioning unit side or only one arbitrary bent portion. .

請求項２に記載の発明は、請求項１に記載の空調ダクトにおいて、前記ダクトは角筒状に形成されてなるとともに、前記屈曲部は前記空調ユニット側から見たダクト内の対向面がその屈曲方向に傾斜した傾斜面を有してなり、前記第１の吸音部材はこの傾斜面に対して設けられてなり、前記第２の吸音部材はこの傾斜面の傾斜角度に応じて定まる同傾斜面への入射波が反射される当該ダクト内の対向領域に対して設けられてなることをその要旨とする。   According to a second aspect of the present invention, in the air conditioning duct according to the first aspect, the duct is formed in a rectangular tube shape, and the bent portion has an opposing surface in the duct as viewed from the air conditioning unit side. It has an inclined surface inclined in the bending direction, the first sound absorbing member is provided with respect to the inclined surface, and the second sound absorbing member has the same inclination determined according to the inclination angle of the inclined surface. The gist of the present invention is that it is provided for the opposing region in the duct where the incident wave on the surface is reflected.

このような構成によれば、上記傾斜面の傾斜角度さえ決まれば上記第２の吸音部材を配設すべき領域もより容易に求まることとなり、ひいては同空調ダクトの設計や製造もより容易となる。また、ダクト自体をこのように角筒状とすることで、上記第１の吸音部材や第２の吸音部材の配設も容易となる。   According to such a configuration, as long as the inclination angle of the inclined surface is determined, the region where the second sound absorbing member is to be disposed can be obtained more easily, and the design and manufacture of the air-conditioning duct becomes easier. . In addition, by arranging the duct itself in the shape of a rectangular tube in this way, it is easy to dispose the first sound absorbing member and the second sound absorbing member.

請求項３に記載の発明は、請求項２に記載の空調ダクトにおいて、前記第２の吸音部材が設けられる領域である前記傾斜面の傾斜角度に応じて定まる同傾斜面への入射波が反射されるダクト内の対向領域が、前記屈曲部の内側に対応する同ダクト内の屈曲壁面から前記吹出口側に至る特定領域であることをその要旨とする。   According to a third aspect of the present invention, in the air conditioning duct according to the second aspect, an incident wave on the inclined surface that is determined according to an inclination angle of the inclined surface, which is an area where the second sound absorbing member is provided, is reflected. The gist is that the facing region in the duct to be performed is a specific region from the bent wall surface in the duct corresponding to the inside of the bent portion to the outlet side.

このような構成によれば、上記傾斜面への入射波が反射されるダクト内の対向領域の一端が上記屈曲部の内側に対応する同ダクト内の屈曲壁面に位置する態様で、すなわち上記傾斜面の傾斜角度が吹出口側になだらかな角度をもって設定されることとなる。したがってこの場合、同傾斜面への入射波が反射されるダクト内の対向領域の他端も、自ずと上記ダクト内の屈曲壁面から上記吹出口側への比較的近い位置に収まるようになり、ひいては上記第２の吸音部材の配設領域についてもこれを必要最小限の領域に収めることができるようになる。   According to such a configuration, one end of the facing region in the duct where the incident wave to the inclined surface is reflected is positioned on the bent wall surface in the duct corresponding to the inside of the bent portion, that is, the inclined surface. The inclination angle of the surface is set with a gentle angle on the outlet side. Therefore, in this case, the other end of the opposing region in the duct where the incident wave on the inclined surface is reflected naturally fits in a relatively close position from the bent wall surface in the duct to the outlet side. The arrangement area of the second sound absorbing member can be accommodated in the minimum necessary area.

請求項４に記載の発明は、請求項１〜３のいずれか一項に記載の空調ダクトにおいて、前記第２の吸音部材はそのダクト内での面位置が同ダクト内の壁面位置に一致する態様にて同ダクトに設けられた収容凹部に収容されてなることをその要旨とする。   Invention of Claim 4 is an air-conditioning duct as described in any one of Claims 1-3. WHEREIN: As for the said 2nd sound absorption member, the surface position in the duct corresponds with the wall surface position in the duct. It is the gist of being housed in a housing recess provided in the duct in the aspect.

空調ダクトとしてのこのような構成によれば、ダクト内に上記第２の吸音部材を設ける場合であれ、同第２の吸音部材の配設に起因する風切音の発生や通気抵抗の増大が避けられ、ダクト中での圧力損失を招くようなこともなくなる。   According to such a configuration as the air conditioning duct, even when the second sound absorbing member is provided in the duct, generation of wind noise and increase in ventilation resistance due to the arrangement of the second sound absorbing member are caused. It can be avoided, and pressure loss in the duct is not caused.

請求項５に記載の発明は、請求項１〜４のいずれか一項に記載の空調ダクトにおいて、前記第１の吸音部材と前記第２の吸音部材とは各々周波数帯域の異なる振動エネルギを減衰する各別の吸音特性に設定されてなることをその要旨とする。   According to a fifth aspect of the present invention, in the air conditioning duct according to any one of the first to fourth aspects, the first sound absorbing member and the second sound absorbing member attenuate vibration energy having different frequency bands. The gist is that the sound absorption characteristics are set to be different.

このような構成によれば、より広い周波数帯域の騒音に対してその吸音(消音)効果を得ることができるようになり、それら各吸音部材を通じた吸音構造としての設計の自由度も高められるようになる。   According to such a configuration, it becomes possible to obtain the sound absorption (silence) effect for noise in a wider frequency band, and the degree of freedom of design as a sound absorption structure through each of the sound absorption members can be increased. become.

請求項６に記載の発明は、請求項５に記載の空調ダクトにおいて、前記第２の吸音部材は前記第１の吸音部材にて減衰しきれない周波数帯域の振動エネルギを主に減衰する吸音特性に設定されてなることをその要旨とする。   According to a sixth aspect of the present invention, in the air conditioning duct according to the fifth aspect, the second sound absorbing member mainly absorbs vibration energy in a frequency band that cannot be attenuated by the first sound absorbing member. The gist is that it is set to.

このような構成によって、上記請求項５に記載の空調ダクトとしての上述した作用効果もより顕著となる。
請求項７に記載の発明は、請求項１〜６のいずれか一項に記載の空調ダクトにおいて、前記空調ユニットが車両に搭載された空調ユニットであり、前記空調風が吹き出される室内が当該車両の車室内であることをその要旨とする。 With such a configuration, the above-described operation and effect as the air-conditioning duct according to the fifth aspect become more prominent.
The invention according to claim 7 is the air conditioning duct according to any one of claims 1 to 6, wherein the air conditioning unit is an air conditioning unit mounted on a vehicle, and the room from which the conditioned air is blown is concerned. The gist is that it is in the interior of the vehicle.

特に近年は、自動車等の車両にあってもその車室内の静寂性に対する要求が強い。この点、空調ダクトとしてのこうした構成によれば、そのような要求に応えることも容易となる。   Particularly in recent years, there is a strong demand for the quietness of the interior of a vehicle such as an automobile. In this respect, according to such a configuration as an air conditioning duct, it becomes easy to meet such a requirement.

以上説明したように、本発明の空調ダクトによれば、屈曲部を有する複雑なダクト構造をとる場合であれ、ダクト内壁面に対する吸音部材の適切な配設を通じて空調ユニットから発生される騒音を的確に低減させることができるようになる。   As described above, according to the air conditioning duct of the present invention, even when a complicated duct structure having a bent portion is adopted, noise generated from the air conditioning unit can be accurately obtained through appropriate arrangement of the sound absorbing member with respect to the inner wall surface of the duct. Can be reduced.

本発明を車両、特に自動車に搭載される空調装置に用いられる空調ダクトに具体化した一実施形態を図１〜図３に基づいて説明する。なお、以下の説明、並びに各図において、「左」、「右」、「前」、「後」、「上」、「下」は、特に断らない限り、車両の運転手席に座したドライバーから見た場合の、「左」、「右」、「前」、「後」、「上」、「下」方向である。   An embodiment in which the present invention is embodied in an air conditioning duct used in an air conditioner mounted on a vehicle, particularly an automobile, will be described with reference to FIGS. In the following explanations and figures, “left”, “right”, “front”, “rear”, “upper”, and “lower” refer to the driver sitting in the driver's seat of the vehicle unless otherwise specified. The directions are “left”, “right”, “front”, “rear”, “up”, and “down” when viewed from above.

図１は、車室内の各部材の配置態様を示した斜視図であり、この図１に示されるように、車室内には、各種計器等が搭載されたインストルメントパネル１が設けられている。そして、このインストルメントパネル１の左右方向中央の乗員側（後側）には、空調装置から送風される空調風を車室内に送り出す吹出口２，３が設けられている。   FIG. 1 is a perspective view showing an arrangement mode of each member in a vehicle interior. As shown in FIG. 1, an instrument panel 1 on which various instruments are mounted is provided in the vehicle interior. . And in the passenger | crew side (rear side) of the center of the left-right direction of this instrument panel 1, the blower outlets 2 and 3 which send the air-conditioning wind ventilated from an air conditioner into a vehicle interior are provided.

図２は、このようなインストルメントパネル１の内部に配設されて上記吹出口２，３に空調風を送り出す空調装置について、その斜視構造を模式的に示したものである。
同図２に示すように、この空調装置には、車室内又は車室外から空気を取り入れて当該空気を空調風として送風するとともに、空調風を加熱用熱交換器（図示略）や冷却用熱交換器（図示略）によって温度調節を行う空調ユニット４が設けられている。そして、この空調ユニット４の作動時には、これらの送風や温度調整動作に伴う作動音が同空調ユニット４から常時発生することとなる。 FIG. 2 schematically shows a perspective structure of an air conditioner that is arranged inside the instrument panel 1 and sends conditioned air to the air outlets 2 and 3.
As shown in FIG. 2, in this air conditioner, air is taken in from the interior of the vehicle interior or the exterior of the vehicle interior and blown as the air conditioned air, and the air conditioned air is heated by a heat exchanger (not shown) for heating or cooling. An air conditioning unit 4 that adjusts the temperature by an exchanger (not shown) is provided. And when this air-conditioning unit 4 operates, the operation sound accompanying these ventilation and temperature adjustment operation | movement will always generate | occur | produce from the air-conditioning unit 4.

一方、この空調ユニット４からは、同図２に示されるように上方に向けて角筒状の空調ダクト５が延設されている。この空調ダクト５は、ポリエチレン等からなる熱可塑性樹脂のブロー成形によって作られており、その途中には屈曲された屈曲部６が設けられている。すなわちこの空調ダクト５は、上記インストルメントパネル１（図１）内においてこの屈曲部６が車両後方に向けて屈曲するように配設されるものであり、その一方の開口７ａは上記吹出口２，３（図１）に対向するように設けられ、他方の開口７ｂは上記空調ユニット４に直接接続されている。なお、この空調ダクト５の壁部の厚みは、部位ごとに多少の差はあるものの概ね１〜２ｍｍ程度となっている。また、上記空調ユニット４から上記屈曲部６までの長さは１５〜２０ｃｍ程度であるとともに、この屈曲部６から上記開口７ａまでの長さは８〜１３ｃｍ程度となっている。すなわちこの空調ダクト５において、上記屈曲部６は開口７ａまたは開口７ｂから容易に手が届く位置に形成されている。   On the other hand, as shown in FIG. 2, a square tube-shaped air conditioning duct 5 extends upward from the air conditioning unit 4. The air-conditioning duct 5 is made by blow molding of a thermoplastic resin made of polyethylene or the like, and a bent portion 6 that is bent is provided in the middle thereof. That is, the air-conditioning duct 5 is disposed in the instrument panel 1 (FIG. 1) so that the bent portion 6 bends toward the rear of the vehicle. , 3 (FIG. 1), and the other opening 7b is directly connected to the air conditioning unit 4. In addition, the thickness of the wall part of this air-conditioning duct 5 is about 1-2 mm, although there is some difference for every site | part. The length from the air conditioning unit 4 to the bent portion 6 is about 15 to 20 cm, and the length from the bent portion 6 to the opening 7a is about 8 to 13 cm. That is, in the air conditioning duct 5, the bent portion 6 is formed at a position that can be easily reached from the opening 7a or the opening 7b.

図３は、このような空調ダクト５について、図２のＡ−Ａ線に沿った断面構造を示したものである。この図３に示されるように、上記屈曲部６の外側には、平面状をなして屈曲方向に傾斜する傾斜面６ａが設けられている。この傾斜面６ａの内側は、空調ダクト５内において、空調ユニット４側、すなわち上流側から見て対向面（屈曲部対向面）となっている。   FIG. 3 shows a cross-sectional structure of the air conditioning duct 5 along the line AA in FIG. As shown in FIG. 3, an inclined surface 6 a that is flat and inclined in the bending direction is provided outside the bent portion 6. The inside of the inclined surface 6a is a facing surface (bending portion facing surface) in the air conditioning duct 5 when viewed from the air conditioning unit 4 side, that is, the upstream side.

また、この傾斜面６ａの内側、すなわち上記屈曲部対向面には、同傾斜面６ａに沿うように第１の吸音部材８がその全域に亘って設けられている。この第１の吸音部材８としては、例えばウレタン等からなる合成樹脂発泡材が使用されている。特にここでは、この第１の吸音部材８として連気泡率の大きい連泡タイプのものが用いられるものとする。なお、この第１の吸音部材８は、上記空調ダクト５の開口７ａあるいは開口７ｂ側から接着剤または粘着材等によって上記屈曲部対向面（傾斜面６ａの内側）に直接貼り付けられる。   Further, the first sound absorbing member 8 is provided over the entire area of the inclined surface 6a, that is, on the surface facing the bent portion, along the inclined surface 6a. As the first sound absorbing member 8, for example, a synthetic resin foam material made of urethane or the like is used. In particular, here, the first sound-absorbing member 8 is of the open-cell type having a large open-cell rate. The first sound absorbing member 8 is directly attached to the bent portion facing surface (inside the inclined surface 6a) from the opening 7a or the opening 7b side of the air conditioning duct 5 with an adhesive or an adhesive.

一方、上記屈曲部６の内側にあたるとともに、上記屈曲部対向面の角度に応じて定まる同屈曲部対向面への入射波（音波）が反射されるダクト内の対向領域１０ａは、内壁面５ａからみて空調ダクト５の外側に向けて突出しており、そこには内側面９ｂを底部とする収容凹部９が形成されている。そして、この収容凹部９には、同収容凹部９の形状と整合するように、すなわちその面位置が同空調ダクト５の内壁面５ａの壁面位置と一致する態様で第２の吸音部材１０が設けられている。この第２の吸音部材１０も、上記第１の吸音部材８と同様に、例えばウレタン等からなる合成樹脂発泡材によって形成されているとともに、同空調ダクト５の開口７ａあるいは開口７ｂ側から接着剤または粘着材等によって上記内側面９ｂに沿うように貼り付けてられる。なお、第１の吸音部材８および第２の吸音部材１０は、夫々１０ｍｍ程度の厚さに形成されている。   On the other hand, the opposing region 10a in the duct that falls inside the bent portion 6 and reflects incident waves (sound waves) to the bent portion facing surface determined according to the angle of the bent portion facing surface is formed from the inner wall surface 5a. As a result, it protrudes toward the outside of the air conditioning duct 5, and an accommodation recess 9 having an inner side surface 9 b as a bottom is formed there. And in this accommodation recessed part 9, the 2nd sound absorption member 10 is provided so that the surface position may correspond with the shape of the accommodation recessed part 9, ie, the surface position may correspond with the wall surface position of the inner wall surface 5a of the same air-conditioning duct 5. It has been. Similarly to the first sound absorbing member 8, the second sound absorbing member 10 is also formed of a synthetic resin foam material made of urethane or the like, and has an adhesive from the opening 7a or opening 7b side of the air conditioning duct 5. Or it is affixed so that the said inner surface 9b may be followed by an adhesive material. The first sound absorbing member 8 and the second sound absorbing member 10 are each formed to a thickness of about 10 mm.

次に、上記第１の吸音部材８と上記第２の吸音部材１０の位置関係について、空調ユニット４から発生した作動音の伝達態様に着目しながらさらに詳述する。
上述のように、空調ユニット４からは、その作動時、空調風の送風や温度調節をする際の作動音が騒音として常時生じている。音波は通常直進する性質を有しているため、こうして空調ユニット４で発生した作動音は、図３に矢印Ｂ（実線で示す）として示すように、ここでの例では空調ダクト５内を鉛直方向上方に向けて空調ダクト５内の空気を振動させながら伝播していく。そして、上述した本実施形態の空調ダクト５のように、そのダクト途中に屈曲部６を有している場合、この作動音は空調ユニット４側から見た屈曲部６の対向面、すなわち上記傾斜面６ａの内側に設けられた第１の吸音部材８に向かって伝播する。 Next, the positional relationship between the first sound absorbing member 8 and the second sound absorbing member 10 will be described in more detail while paying attention to the transmission mode of the operating sound generated from the air conditioning unit 4.
As described above, from the air conditioning unit 4, during the operation, the operation sound at the time of air blowing or temperature adjustment is always generated as noise. Since the sound wave normally has a property of traveling straight, the operation sound generated in the air conditioning unit 4 in this way is vertically moved in the air conditioning duct 5 in this example as shown by an arrow B (shown by a solid line) in FIG. Propagating while vibrating the air in the air conditioning duct 5 upward in the direction. And when it has the bending part 6 in the middle of the duct like the air conditioning duct 5 of this embodiment mentioned above, this operation sound is the opposing surface of the bending part 6 seen from the air conditioning unit 4 side, ie, the said inclination. It propagates toward the first sound absorbing member 8 provided inside the surface 6a.

こうして、作動音が第１の吸音部材８に入射すると、同作動音の振動エネルギがこの第１の吸音部材８により減衰されて吸音される。すなわち、上記ウレタン等の発泡材からなる第１の吸音部材８は内部に多数の孔を有しており、同孔内で作動音の振動エネルギが熱エネルギに変換されることによって、作動音が減衰（吸音）されるようになる。   Thus, when the operating sound is incident on the first sound absorbing member 8, the vibration energy of the operating sound is attenuated by the first sound absorbing member 8 and is absorbed. That is, the first sound absorbing member 8 made of a foamed material such as urethane has a large number of holes therein, and the vibration noise of the operating sound is converted into heat energy in the hole, so that the operating sound is generated. It is attenuated (sound absorption).

また、第１の吸音部材８によって吸音しきれなかった作動音（騒音）成分の一部は第１の吸音部材８を透過して屈曲部６の傾斜面６ａに衝突し、図３に矢印Ｄ（一点鎖線で示す）として示した経路をとりながら反射される。なお、この反射成分には、同図３に矢印Ｃ（二点鎖線で示す）にて示すような第１の吸音部材８の表面で反射される成分も含まれる。ここで上述のように、こうして反射される騒音（作動音）の進行方向は上記傾斜面６ａの傾斜角度に依存している。ちなみに本実施形態にあって、この傾斜面６ａの傾斜角度は、上記反射波の一端を屈曲部６の内側に対応する当該空調ダクト５内の屈曲壁面６ｂに向けて反射しうる角度にて、上記吹出口２，３（図１）側になだらかに傾斜するように設定されている。そのため、上記傾斜面６ａおよび第１の吸音部材８からの反射波の他端も、自ずとこの屈曲壁面６ｂから吹出口２，３側の比較的近い範囲内に収まるようになる。   Further, a part of the operating sound (noise) component that could not be absorbed by the first sound absorbing member 8 passes through the first sound absorbing member 8 and collides with the inclined surface 6a of the bent portion 6, and the arrow D in FIG. Reflected while taking the path indicated as (indicated by a dashed line). The reflection component includes a component reflected by the surface of the first sound absorbing member 8 as indicated by an arrow C (indicated by a two-dot chain line) in FIG. Here, as described above, the traveling direction of the noise (operation sound) thus reflected depends on the inclination angle of the inclined surface 6a. Incidentally, in this embodiment, the inclination angle of the inclined surface 6a is an angle at which one end of the reflected wave can be reflected toward the bent wall surface 6b in the air conditioning duct 5 corresponding to the inside of the bent portion 6. It is set so as to be gently inclined toward the outlets 2 and 3 (FIG. 1). Therefore, the other end of the reflected wave from the inclined surface 6a and the first sound absorbing member 8 naturally falls within a relatively close range from the bent wall surface 6b to the outlets 2 and 3 side.

一方、第２の吸音部材１０は、当該空調ダクト５内の上記屈曲壁面６ｂから吹出口２，３側に至る特定領域、すなわち上述した屈曲部対向面となる傾斜面６ａの内側あるいは第１の吸音部材８への入射波（音波、騒音）が反射される同空調ダクト５内の対向領域１０ａに設けられている。すなわち、この第２の吸音部材１０は、上記第１の吸音部材８にて吸音しきれなかった騒音成分を吸音するように設けられており、これによってこうした騒音成分のさらなる吸音が図られ、ひいては上記吹出口２，３（図１）を介しての車室内への騒音の流出も大きく抑制されるようになる。なお、この第２の吸音部材１０は上述のように、その面位置が当該ダクト５の内壁面５ａと一致するように収容凹部９に埋設されているため、空調ユニット４から送風される空調風の流動を阻害することもない。すなわち、この第２の吸音部材１０の配設に起因する風切音の発生や通気抵抗の増大は避けられるようになり、同空調ダクト５内での圧力損失を招くようなこともなくなる。   On the other hand, the second sound-absorbing member 10 has a specific region extending from the bent wall surface 6b to the outlets 2 and 3 in the air conditioning duct 5, that is, the inner side of the inclined surface 6a serving as the above-described bent portion facing surface or the first. It is provided in the facing area 10a in the air conditioning duct 5 where the incident wave (sound wave, noise) to the sound absorbing member 8 is reflected. That is, the second sound absorbing member 10 is provided so as to absorb a noise component that could not be absorbed by the first sound absorbing member 8, thereby further absorbing such a noise component. Outflow of noise into the passenger compartment through the air outlets 2 and 3 (FIG. 1) is also greatly suppressed. Since the second sound absorbing member 10 is embedded in the housing recess 9 so that the surface position thereof coincides with the inner wall surface 5a of the duct 5, as described above, the conditioned air blown from the air conditioning unit 4 is used. It does not hinder the flow. That is, generation of wind noise and increase in ventilation resistance due to the arrangement of the second sound absorbing member 10 can be avoided, and pressure loss in the air conditioning duct 5 is not caused.

図４および図５は、このような実施形態の空調ダクトの上記第１の吸音部材８および第２の吸音部材１０による吸音（消音）効果について実験による測定結果を示したものであり、次にこれら図４および図５を併せて参照して、本実施形態の空調ダクトによる吸音（消音）特性について考察する。   FIGS. 4 and 5 show experimental measurement results of the sound absorption (silence) effect of the first sound absorbing member 8 and the second sound absorbing member 10 of the air conditioning duct of such an embodiment. With reference to these FIG. 4 and FIG. 5 together, the sound absorption (silence) characteristics of the air conditioning duct of this embodiment will be considered.

まず、図４に示すデータは、本実施形態の空調ダクト５の一方、すなわち空調ユニット４側の開口７ｂにスピーカーを設置してこれを鳴動駆動するとともに、他方の開口７ａにおける周波数毎の騒音レベルを測定した実験結果を周波数特性図として示したものである。本実験では、第１の吸音部材８および第２の吸音部材１０を取付けた実験データＬ１（図４に実線で示す）の採取に併せて、第１の吸音部材８のみを取付けた比較データＬ２（図４に破線で示す）と、吸音部材を取付けなかった比較データＬ３（図４に二点鎖線で示す）とについても同様に採取を行った。その結果、第１の吸音部材８及び第２の吸音部材１０を取付けた実験データＬ１では、比較データＬ２および比較データＬ３と比較して、１６００Ｈｚ〜６３００Ｈｚの周波数帯域、いわゆる人間の耳につきやすい周波数帯域において騒音レベルの低下が観測された。このような実験結果からも明らかなように、上記第１の吸音部材８および第２の吸音部材１０を共に設けることで、車室内の騒音も大幅に低減されるようになることが分かる。   First, the data shown in FIG. 4 indicates that the speaker is installed in one of the air-conditioning ducts 5 of this embodiment, that is, the opening 7b on the air-conditioning unit 4 side, and is driven to ring, and the noise level for each frequency in the other opening 7a. The experimental result which measured was shown as a frequency characteristic figure. In this experiment, comparison data L2 in which only the first sound absorbing member 8 is attached together with the collection of experimental data L1 (indicated by a solid line in FIG. 4) in which the first sound absorbing member 8 and the second sound absorbing member 10 are attached. Sampling was also carried out in the same manner for the comparative data L3 (shown by a two-dot chain line in FIG. 4) in which the sound absorbing member was not attached (shown by a broken line in FIG. 4). As a result, in the experimental data L1 to which the first sound absorbing member 8 and the second sound absorbing member 10 are attached, compared with the comparison data L2 and the comparison data L3, a frequency band of 1600 Hz to 6300 Hz, that is, a frequency that is easily heard by human ears. A decrease in noise level was observed in the band. As is clear from the experimental results, it can be seen that by providing both the first sound absorbing member 8 and the second sound absorbing member 10, the noise in the passenger compartment can be greatly reduced.

また、図５に示すデータは、本実施形態の空調ダクト５の空調ユニット４側の一方の開口７ｂに送風ファンを装着してこれを駆動するとともに、同空調ダクト５の上記第２の吸音部材１０が設けられている位置において同様に周波数毎の騒音レベルを測定した実験結果を周波数特性図として示したものである。なお本実験において、上記ファンによる送風量、すなわち風の流量は２４０ｍ３／ｈに設定されている。そして、本実験においても、第１の吸音部材８および第２の吸音部材１０を取付けた実験データＬ４（図５に破線で示す）の採取に併せて、第１の吸音部材８のみを取付けた比較データＬ５（図５に実線で示す）についても同様に採取をおこなった。その結果、実験データＬ４では、比較データＬ５と比較して、５００Ｈｚ〜６３００Ｈｚといった広い周波数帯域において騒音レベルの低下が観測された。これにより、比較的低周波数域にある送風音の一部も第２の吸音部材１０によって吸音（消音）されていることが分かる。 In addition, the data shown in FIG. 5 indicates that the second sound absorbing member of the air-conditioning duct 5 is driven by mounting a blower fan on one opening 7b on the air-conditioning unit 4 side of the air-conditioning duct 5 of this embodiment. Similarly, the experimental result of measuring the noise level for each frequency at the position where 10 is provided is shown as a frequency characteristic diagram. In this experiment, the amount of air blown by the fan, that is, the flow rate of the wind is set to 240 m 3 / h. In this experiment as well, only the first sound absorbing member 8 was attached together with the collection of experimental data L4 (shown by broken lines in FIG. 5) in which the first sound absorbing member 8 and the second sound absorbing member 10 were attached. The comparison data L5 (shown by a solid line in FIG. 5) was also collected in the same manner. As a result, in the experimental data L4, a decrease in noise level was observed in a wide frequency band of 500 Hz to 6300 Hz compared to the comparison data L5. Thereby, it can be seen that part of the blowing sound in the relatively low frequency range is also absorbed (muted) by the second sound absorbing member 10.

以上説明したように、本実施形態の空調ダクトによれば、以下のような効果が得られるようになる。
（１）空調ユニット４側から見た屈曲部６の対向面、すなわち傾斜面６ａの内側に第１の吸音部材８を備えるとともに、この同傾斜面６ａまたは第１の吸音部材８の面への入射波が反射される空調ダクト５内の対向領域１０ａに第２の吸音部材１０を備えることとした。これにより、第１の吸音部材８から反射される騒音成分、すなわち第１の吸音部材８では吸音しきれなかった騒音成分（反射波成分）が第２の吸音部材１０にさらに入射され、吸音されることとなるため、第１の吸音部材８では吸音しきれなかった騒音成分も、この第２の吸音部材１０を通じてそのさらなる減衰が図られるようになる。そして、このようなかたちで空調ユニット４から発せられる騒音の吸音（消音）が図られることで、吹出口２，３からの騒音の流出も大きく抑制されるようになる。 As described above, according to the air conditioning duct of the present embodiment, the following effects can be obtained.
(1) The first sound absorbing member 8 is provided on the opposite surface of the bent portion 6 as viewed from the air conditioning unit 4 side, that is, on the inner side of the inclined surface 6a, and the surface of the inclined surface 6a or the first sound absorbing member 8 is provided. The second sound absorbing member 10 is provided in the facing region 10a in the air conditioning duct 5 where the incident wave is reflected. As a result, the noise component reflected from the first sound absorbing member 8, that is, the noise component (reflected wave component) that could not be absorbed by the first sound absorbing member 8, is further incident on the second sound absorbing member 10 and absorbed. Therefore, the noise component that could not be absorbed by the first sound absorbing member 8 can be further attenuated through the second sound absorbing member 10. And by the sound absorption (muffling) of the noise emitted from the air conditioning unit 4 in this way, the outflow of noise from the air outlets 2 and 3 is greatly suppressed.

（２）各吸音部材８，１０を配設する箇所を屈曲部６に限っても十分な吸音効果が得られるため、吸音部材の配設が必要最小限の箇所で済み、生産コストの増大を抑えることができる。   (2) A sufficient sound absorbing effect can be obtained even if the sound absorbing members 8 and 10 are disposed only at the bent portion 6, so that the sound absorbing member can be disposed at the minimum necessary position and the production cost can be increased. Can be suppressed.

（３）空調ダクト５を角筒状に形成するとともに、屈曲部６にはその屈曲方向に傾斜する傾斜面６ａを設けることとした。このような構成によれば、傾斜面６ａの傾斜角度さえ決まれば第２の吸音部材１０を配設すべき領域もより容易に求まることとなり、ひいては空調ダクト５の設計や製造もより容易となる。また、空調ダクト５自体をこのように角筒状とすることで、第１の吸音部材８や第２の吸音部材１０の配設も容易となる。   (3) The air-conditioning duct 5 is formed in a rectangular tube shape, and the bending portion 6 is provided with an inclined surface 6a inclined in the bending direction. According to such a configuration, as long as the inclination angle of the inclined surface 6a is determined, the region where the second sound absorbing member 10 is to be disposed can be obtained more easily, and thus the design and manufacture of the air conditioning duct 5 becomes easier. . Further, the air conditioning duct 5 itself is formed in a rectangular tube shape as described above, so that the first sound absorbing member 8 and the second sound absorbing member 10 can be easily arranged.

（４）第２の吸音部材１０が設けられる上記対向領域１０ａが、屈曲部６の内側に対応する空調ダクト５内の屈曲壁面６ｂから吹出口２，３側に至る特定の領域であることとした。このような構成によれば、上記第１の吸音部材８あるいは傾斜面６ａの内側への入射波が反射される空調ダクト５内の対向領域１０ａの一端が屈曲部６の内側に対応する空調ダクト５内の屈曲壁面６ｂに位置する態様で、すなわち傾斜面６ａの傾斜角度が吹出口３側になだらかな角度をもって設定されることとなる。したがってこの場合、第１の吸音部材８あるいは傾斜面６ａの内側への入射波が反射される空調ダクト５内の対向領域１０ａの他端も、自ずと空調ダクト５内の屈曲壁面６ｂから上記吹出口３側への比較的近い位置に収まるようになり、ひいては第２の吸音部材１０の配設領域についてもこれを必要最小限の領域に収めることができるようになる。   (4) The said opposing area | region 10a in which the 2nd sound absorption member 10 is provided is a specific area | region from the bending wall surface 6b in the air-conditioning duct 5 corresponding to the inner side of the bending part 6 to the blower outlets 2 and 3 side. did. According to such a configuration, the air conditioning duct in which one end of the facing region 10a in the air conditioning duct 5 in which the incident wave to the inside of the first sound absorbing member 8 or the inclined surface 6a is reflected corresponds to the inside of the bent portion 6. 5, the inclination angle of the inclined surface 6a is set with a gentle angle on the outlet 3 side. Therefore, in this case, the other end of the facing region 10a in the air conditioning duct 5 where the incident wave to the inside of the first sound absorbing member 8 or the inclined surface 6a is reflected is also naturally from the bent wall surface 6b in the air conditioning duct 5 to the outlet. Thus, the second sound-absorbing member 10 can be accommodated in a necessary minimum region.

（５）第２の吸音部材１０についてはこれを、その面位置が空調ダクト５内の内壁面５ａの壁面位置に一致する態様にて収容凹部９に収容することとした。空調ダクト５としてのこのような構成によれば、空調ダクト５内に第２の吸音部材１０を設ける場合であれ、該第２の吸音部材１０の配設に起因する風切音の発生や通気抵抗の増大が避けられ、空調ダクト５内での圧力損失を招くようなこともなくなる。また、この第２の吸音部材１０を通じて空調風による風切音の一部を吸音することもでき、空調風に起因する騒音についてもその低下が期待できるようになる。   (5) The second sound absorbing member 10 is accommodated in the accommodating recess 9 in such a manner that the surface position thereof coincides with the wall surface position of the inner wall surface 5 a in the air conditioning duct 5. According to such a configuration as the air conditioning duct 5, even when the second sound absorbing member 10 is provided in the air conditioning duct 5, the generation of wind noise and ventilation due to the arrangement of the second sound absorbing member 10 is performed. An increase in resistance is avoided, and pressure loss in the air conditioning duct 5 is not caused. In addition, a part of the wind noise generated by the conditioned air can be absorbed through the second sound absorbing member 10, and a reduction in noise caused by the conditioned air can be expected.

なお、本実施形態はこれを適宜変更した以下の形態にて実施することもできる。
・第１の吸音部材８と第２の吸音部材１０についてはこれらを夫々異なる周波数帯域の振動エネルギを減衰させる吸音特性に設定するように変更してもよい。このような構成によれば、より広い周波数帯域の騒音に対してその吸音(消音)効果を得ることができるようになり、それら各吸音部材を通じた吸音構造としての設計の自由度も高められるようになる。また、第２の吸音部材１０についてはこれを第１の吸音部材８にて減衰しきれない周波数帯域の振動エネルギを主に減衰する吸音特性に設定することとすれば、こうした作用効果もより顕著となる。 In addition, this embodiment can also be implemented with the following forms which changed this suitably.
-About the 1st sound absorption member 8 and the 2nd sound absorption member 10, you may change so that these may be set to the sound absorption characteristic which attenuates the vibration energy of a different frequency band, respectively. According to such a configuration, it becomes possible to obtain the sound absorption (silence) effect for noise in a wider frequency band, and the degree of freedom of design as a sound absorption structure through each of the sound absorption members can be increased. become. Further, if the second sound absorbing member 10 is set to a sound absorbing characteristic that mainly attenuates vibration energy in a frequency band that cannot be attenuated by the first sound absorbing member 8, such an effect is more remarkable. It becomes.

・各吸音部材８,１０をウレタン等の合成樹脂発泡材によって形成することとしたが、いわゆる吸音材として通常に用いられている材料であればその選択は任意である。他に例えば、ガラス繊維材や各種不織布等を単独で、或いは組み合わせて用いてもよい。その他、合成樹脂発泡材としても、ポリエチレンやポリプロピレン、ポリスチレン等がある。   The sound absorbing members 8 and 10 are made of a synthetic resin foam material such as urethane, but the selection is arbitrary as long as it is a material normally used as a so-called sound absorbing material. In addition, for example, glass fiber materials, various nonwoven fabrics, and the like may be used alone or in combination. Other synthetic resin foams include polyethylene, polypropylene, and polystyrene.

・傾斜面６ａ全体が吹出口３側に傾斜するよう屈曲部６を形成したが、傾斜面６ａの一部のみを傾斜させ、その傾斜面に第１の吸音部材を設けるように変更してもよい。
・空調ダクト５の形状は円筒状に形成してもよい。要は空調ユニット４側から、すなわち上流側から見たダクト内の屈曲部対向面に第１の吸音部材８を備えるとともに、この屈曲部対向面の角度に応じて定まる同屈曲部対向面への入射波が反射されるダクト内の対向領域に第２の吸音部材１０を備える構成であればよい。空調ダクトとしてのこのような構成であれば、先の実施形態の上記（１）、（２）、（４）、および（５）に準ずる効果を得ることはできる。 The bent portion 6 is formed so that the entire inclined surface 6a is inclined toward the air outlet 3 side, but only a part of the inclined surface 6a is inclined and the first sound absorbing member is provided on the inclined surface. Good.
The air conditioning duct 5 may be formed in a cylindrical shape. In short, the first sound absorbing member 8 is provided on the bent portion facing surface in the duct as viewed from the air conditioning unit 4 side, that is, the upstream side, and the bent portion facing surface determined according to the angle of the bent portion facing surface is provided. What is necessary is just the structure provided with the 2nd sound absorption member 10 in the opposing area | region in the duct in which an incident wave is reflected. With such a configuration as an air conditioning duct, it is possible to obtain an effect according to the above (1), (2), (4), and (5) of the previous embodiment.

・第２の吸音部材１０を傾斜面６ａまたは第１の吸音部材８の面への入射波が反射される空調ダクト５内の対向領域１０ａの一部にのみ設けるよう変更しても良い。
・空調ダクトとして屈曲部が複数設けられたダクトにこの発明を適用するようにしてもよい。このような空調ダクトにあっても、屈曲部毎に上記実施形態のような吸音構造を採用するようにすれば、その吸音（消音）効果もより高められるようになる。また、このように屈曲部が複数設けられる空調ダクトであれ、空調ユニット４側から見た最初の屈曲部、あるいは任意の１つの屈曲部に対してのみ上記実施形態の吸音構造を採用する構成としてもよい。 -You may change so that the 2nd sound absorption member 10 may be provided only in a part of opposing area | region 10a in the air conditioning duct 5 in which the incident wave to the surface of the inclined surface 6a or the 1st sound absorption member 8 is reflected.
-You may make it apply this invention to the duct in which the bending part was provided with two or more as an air-conditioning duct. Even in such an air conditioning duct, if the sound absorbing structure as in the above-described embodiment is adopted for each bent portion, the sound absorbing (silence) effect can be further enhanced. Moreover, even if it is an air-conditioning duct provided with two or more bending parts in this way, as a structure which employ | adopts the sound absorption structure of the said embodiment only with respect to the first bending part seen from the air-conditioning unit 4 side, or arbitrary one bending parts. Also good.

・上記自動車に搭載される空調装置の空調ダクトに限らず、他に自動車のデフロスターノズルや家屋用の空調装置に用いられる空調ダクトにこの発明にかかる空調ダクトの吸音構造を適用するようにしてもよい。   The sound absorbing structure of the air conditioning duct according to the present invention is applied not only to the air conditioning duct of the air conditioning apparatus mounted on the automobile but also to an air conditioning duct used for an automobile defroster nozzle or an air conditioning apparatus for a house. Good.

本実施形態にかかる空調ダクトの一実施形態が設けられるインストルメントパネルおよびその周辺の車室内構造を示した斜視図。The perspective view which showed the instrument panel in which one Embodiment of the air-conditioning duct concerning this embodiment is provided, and the vehicle interior structure of the circumference | surroundings. 同実施形態の空調ダクトが適用される空調装置の構成を模式的に示す斜視図。The perspective view which shows typically the structure of the air conditioner to which the air conditioning duct of the embodiment is applied. 同実施形態の空調ダクトの断面図として図２におけるＡ−Ａ線に沿った断面構造を示す断面図。Sectional drawing which shows the cross-sectional structure along the AA in FIG. 2 as sectional drawing of the air conditioning duct of the embodiment. 主に同実施形態の空調ダクトの開口部付近での騒音レベルを測定した実験データを周波数特性図として示すグラフ。The graph which shows the experimental data which mainly measured the noise level in the opening part vicinity of the air-conditioning duct of the embodiment as a frequency characteristic figure. 主に同実施形態の空調ダクトの屈曲部のコーナー内側の騒音レベルを測定した実験データを周波数特性図として示すグラフ。The graph which shows the experimental data which mainly measured the noise level inside the corner of the bending part of the air-conditioning duct of the embodiment as a frequency characteristic diagram.

符号の説明Explanation of symbols

１…車室、２，３…吹出口、４…空調ユニット、５…空調ダクト、５ａ…内壁面、６…屈曲部、６ａ…傾斜面、６ｂ…屈曲壁面、７ａ，７ｂ…開口、８…第１の吸音部材、９…収容凹部、１０…第２の吸音部材、１０ａ…対向領域。   DESCRIPTION OF SYMBOLS 1 ... Car compartment, 2, 3 ... Air outlet, 4 ... Air conditioning unit, 5 ... Air conditioning duct, 5a ... Inner wall surface, 6 ... Bending part, 6a ... Inclined surface, 6b ... Bending wall surface, 7a, 7b ... Opening, 8 ... 1st sound absorption member, 9 ... accommodation recessed part, 10 ... 2nd sound absorption member, 10a ... opposing area | region.

Claims (7)

空調風を送風する空調ユニットから延設され、途中に屈曲部を有して該空調ユニットから送風される空調風を室内に吹き出す吹出口に至る空調ダクトにおいて、
前記空調ユニット側から見たダクト内の屈曲部対向面に振動エネルギを減衰させる第１の吸音部材を備えるとともに、前記屈曲部対向面または第１の吸音部材の面への入射波が反射されるダクト内の対向領域の少なくとも一部に振動エネルギを減衰させる第２の吸音部材を備える
ことを特徴とする空調ダクト。 In the air conditioning duct that extends from the air conditioning unit that blows the conditioned air, has a bent part in the middle, and reaches the outlet that blows out the conditioned air blown from the air conditioning unit into the room,
A first sound-absorbing member that attenuates vibration energy is provided on the surface facing the bent portion in the duct as viewed from the air conditioning unit side, and incident waves on the surface facing the bent portion or the first sound-absorbing member are reflected. An air conditioning duct comprising a second sound absorbing member for attenuating vibration energy in at least a part of a facing area in the duct. 前記ダクトは角筒状に形成されてなるとともに、前記屈曲部は前記空調ユニット側から見たダクト内の対向面がその屈曲方向に傾斜した傾斜面を有してなり、前記第１の吸音部材はこの傾斜面に対して設けられてなり、前記第２の吸音部材はこの傾斜面の傾斜角度に応じて定まる同傾斜面への入射波が反射される当該ダクト内の対向領域に対して設けられてなる
請求項１に記載の空調ダクト。 The duct is formed in a rectangular tube shape, and the bent portion has an inclined surface in which a facing surface in the duct viewed from the air conditioning unit side is inclined in the bending direction, and the first sound absorbing member Is provided with respect to the inclined surface, and the second sound absorbing member is provided with respect to the opposing region in the duct where the incident wave on the inclined surface determined according to the inclination angle of the inclined surface is reflected. The air-conditioning duct according to claim 1. 前記第２の吸音部材が設けられる領域である前記傾斜面の傾斜角度に応じて定まる同傾斜面への入射波が反射されるダクト内の対向領域が、前記屈曲部の内側に対応する同ダクト内の屈曲壁面から前記吹出口側に至る特定領域である
請求項２に記載の空調ダクト。 The opposite duct in the duct where the incident wave to the inclined surface, which is determined according to the inclination angle of the inclined surface, which is the region where the second sound absorbing member is provided, is reflected, corresponds to the inside of the bent portion. The air-conditioning duct according to claim 2, wherein the air-conditioning duct is a specific region extending from an inner bent wall surface to the outlet. 前記第２の吸音部材はそのダクト内での面位置が同ダクト内の壁面位置に一致する態様にて同ダクトに設けられた収容凹部に収容されてなる
請求項１〜３のいずれか一項に記載の空調ダクト。 The second sound absorbing member is housed in a housing recess provided in the duct so that a surface position in the duct matches a wall surface position in the duct. Air conditioning duct as described in. 前記第１の吸音部材と前記第２の吸音部材とは各々周波数帯域の異なる振動エネルギを減衰する各別の吸音特性に設定されてなる
請求項１〜４のいずれか一項に記載の空調ダクト。 The air-conditioning duct according to any one of claims 1 to 4, wherein the first sound-absorbing member and the second sound-absorbing member are set to different sound-absorbing characteristics that attenuate vibration energy having different frequency bands. . 前記第２の吸音部材は前記第１の吸音部材にて減衰しきれない周波数帯域の振動エネルギを主に減衰する吸音特性に設定されてなる
請求項５に記載の空調ダクト。 The air conditioning duct according to claim 5, wherein the second sound absorbing member is set to have a sound absorbing characteristic that mainly attenuates vibration energy in a frequency band that cannot be attenuated by the first sound absorbing member. 前記空調ユニットが車両に搭載された空調ユニットであり、前記空調風が吹き出される室内が当該車両の車室内である
請求項１〜６のいずれか一項に記載の空調ダクト。 The air conditioning duct according to any one of claims 1 to 6, wherein the air conditioning unit is an air conditioning unit mounted on a vehicle, and a room from which the conditioned air is blown is a vehicle interior of the vehicle.
JP2006088950A 2006-03-28 2006-03-28 Air conditioning duct Pending JP2007263466A (en)

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Publication number Priority date Publication date Assignee Title
JP2010145003A (en) * 2008-12-18 2010-07-01 Calsonic Kansei Corp Noise reduction structure for duct
CN110065365A (en) * 2018-01-24 2019-07-30 株式会社丰田自动织机 Louver and its manufacturing method
CN110099810A (en) * 2016-09-30 2019-08-06 尤姆弗泰克有限公司 Ventilation device for making interior of motor vehicles divulge information

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JP2001041021A (en) * 1999-07-27 2001-02-13 Kurimoto Ltd Silencer for air-conditioning duct
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CN110099810A (en) * 2016-09-30 2019-08-06 尤姆弗泰克有限公司 Ventilation device for making interior of motor vehicles divulge information
CN110065365A (en) * 2018-01-24 2019-07-30 株式会社丰田自动织机 Louver and its manufacturing method
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