JPH0441996A - Ventilating fan - Google Patents
Ventilating fanInfo
- Publication number
- JPH0441996A JPH0441996A JP2150793A JP15079390A JPH0441996A JP H0441996 A JPH0441996 A JP H0441996A JP 2150793 A JP2150793 A JP 2150793A JP 15079390 A JP15079390 A JP 15079390A JP H0441996 A JPH0441996 A JP H0441996A
- Authority
- JP
- Japan
- Prior art keywords
- fan
- outer peripheral
- peripheral wall
- casing
- bell mouth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000002093 peripheral effect Effects 0.000 claims description 48
- 238000009423 ventilation Methods 0.000 claims description 24
- 125000006850 spacer group Chemical group 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 description 34
- 230000000694 effects Effects 0.000 description 22
- 238000010586 diagram Methods 0.000 description 14
- 210000002105 tongue Anatomy 0.000 description 7
- 230000005484 gravity Effects 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 239000006261 foam material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は、天井面等に取付け、換気ダクトにより換気を
行うダクト用洋換気扇に関し、特にその吸音構造に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a duct-use Western ventilation fan that is attached to a ceiling surface or the like and performs ventilation through a ventilation duct, and particularly relates to its sound absorption structure.
［従来の技術］
第１１図は例えば実開昭６３−１５２０００号公報に示
された従来の吸音構造を有する換気扇を示す縦断面図、
第１２図は同その要部を拡大して示す分解斜視図である
。図において、（１）は箱形の筐体、（２）は昇圧・送
風作用を行う遠心羽根車、（３）はこの遠心羽根車（２
）を駆動する電動機、（４）は遠心羽根車（２）の周り
を囲んで渦巻状風路（５〉を形成する柔軟性のある発泡
材で構成された柔軟性多孔質外周壁、（６）はこの柔軟
性多孔質外周壁（４）の外側に設けられた背面空気層、
（７）はファン吹き出し口、（８）は換気ダクト（図示
せず）と接続するためのダクトフランジ、（９）は遠心
羽根車（２）の吸い込み側に設けられたベルマウス状の
ファン吸い込み口（ｌＯ）を有するベルマウス付側板、
（１１）は柔軟性多孔質外周壁（４）を固定するための
チャンネル（１２）を形成するリブ状突起、（１３）は
柔軟性多孔質外周壁（４）の春期めの曲線形状を形成す
るプラスチック等からなる舌部である。[Prior Art] FIG. 11 is a vertical cross-sectional view showing a ventilation fan having a conventional sound-absorbing structure, as disclosed in, for example, Japanese Utility Model Application Publication No. 152000/1983;
FIG. 12 is an exploded perspective view showing an enlarged main part of the same. In the figure, (1) is a box-shaped housing, (2) is a centrifugal impeller that performs pressure boosting and air blowing, and (3) is this centrifugal impeller (2).
), (4) is a flexible porous outer peripheral wall made of a flexible foam material surrounding the centrifugal impeller (2) to form a spiral air passage (5〉), (6 ) is a back air layer provided on the outside of this flexible porous outer peripheral wall (4),
(7) is a fan outlet, (8) is a duct flange for connecting to a ventilation duct (not shown), and (9) is a bellmouth-shaped fan suction provided on the suction side of the centrifugal impeller (2). a side plate with a bell mouth having an opening (lO);
(11) is a rib-like protrusion that forms a channel (12) for fixing the flexible porous outer peripheral wall (4), and (13) forms the spring curved shape of the flexible porous outer peripheral wall (4). It is a tongue made of plastic etc.
従来の吸音構造を有する換気扇は上記のように構成され
、電動機（３）により回転駆動された遠心羽根車（２）
の作用により室内側の空気がベルマウス付側板に設けら
れたファン吸い込み口（ｌＯ）により流入し、遠心羽根
車（２）と柔軟性多孔質外周壁（４）により形成される
渦巻状風路（５）を通る間に昇圧されてファン吹き出し
口（７）に集められ、ダクトフランジ（８）に接続され
る換気ダクト（図示せず）を経て室外に排出される。こ
の過程において、遠心羽根車（２）より発生した送風機
騒音が柔軟性多孔質外周壁（４）と背面空気Ｎ（６）と
により構成される吸音部の吸音効果により吸収減衰され
るため、ファン吸い込み口（１０）より室内に伝播され
る騒音を抑制することができる。A conventional ventilation fan having a sound absorption structure is configured as described above, and includes a centrifugal impeller (2) rotationally driven by an electric motor (3).
Due to this action, air inside the room flows in through the fan suction port (lO) provided on the side plate with a bell mouth, and a spiral air path is formed by the centrifugal impeller (2) and the flexible porous outer peripheral wall (4). (5), the air is pressurized and collected at the fan outlet (7), and is discharged outside through a ventilation duct (not shown) connected to the duct flange (8). In this process, the blower noise generated by the centrifugal impeller (2) is absorbed and attenuated by the sound absorbing effect of the sound absorbing section composed of the flexible porous outer peripheral wall (4) and the back air N (6). Noise propagated indoors through the suction port (10) can be suppressed.
［発明が解決しようとするＮＲ］
上記のような従来の吸音構造を有する換気扇では、多孔
質外周壁（４）が柔軟性のある発泡材て構成されている
ため、これを位置決めして固定するためのチャンネル（
１２）を形成するリブ状突起（１０）や曲線形状の舌部
（１２）が別に必要となって、構造が複雑で組み立て性
も悪いことや、実質的な吸音部表面積が制限された分だ
け吸音効果も少ないこと、柔軟性多孔質外周壁（４）の
寸法精度を良くてきないため性能のばらつきも大きいこ
となどの問題点があった。また、リブ状突起（１１）を
設けるためのスペースが余分に必要になることや、多孔
質外周壁（４）を柔軟性を有する発泡材で構成している
ため、吸音性能を向上させるにはある程度厚くすること
が必要になることなどにより、筐体（１）の内側寸法に
比べて渦巻状風路を形成する柔軟性多孔質外周壁（４）
の内側寸法がかなり小さくなるため、風量や圧力などの
空力性能が相当低くなってしまうという問題点があった
。[NR to be solved by the invention] In the conventional ventilation fan having a sound absorption structure as described above, the porous outer peripheral wall (4) is made of a flexible foam material, so it is necessary to position and fix it. Channel for (
The rib-like protrusion (10) and curved tongue (12) that form the sound absorbing part (12) are required separately, making the structure complicated and difficult to assemble, and the practical surface area of the sound absorbing part is limited. There were problems such as the sound absorption effect was low, and the dimensional accuracy of the flexible porous peripheral wall (4) was not improved, resulting in large variations in performance. In addition, since extra space is required to provide the rib-like protrusions (11) and the porous outer peripheral wall (4) is made of a flexible foam material, it is difficult to improve the sound absorption performance. Due to the need to increase the thickness to a certain extent, the flexible porous outer peripheral wall (4) forms a spiral air passage compared to the inner dimensions of the housing (1).
Since the inner dimensions of the engine were considerably smaller, there was a problem in that the aerodynamic performance, such as air volume and pressure, was considerably lower.
本発明は上記のような問題点を解消するためになされた
もので、従来例のようなリブ状突起や舌部等を別に設け
る必要がない簡単な構造で、紺み立て性や寸法精度が良
く、渦巻状風路の内側表面の吸音部を無駄なく利用して
十分な吸音効果を確保した吸音構造を有する換気扇を得
ることを目的とする。The present invention has been made to solve the above-mentioned problems, and has a simple structure that does not require separate rib-like protrusions or tongues as in the conventional example, and improves darkening properties and dimensional accuracy. To provide a ventilation fan having a sound absorbing structure that ensures a sufficient sound absorbing effect by efficiently utilizing the sound absorbing part on the inner surface of a spiral air passage.
また本発明は、筐体の内側寸法と比べた多孔質外周壁の
内側寸法の減少が僅かで、ファン空力性能の低下が殆ど
無いにもかかわらず、十分な吸き効果を確保した吸音構
造を有する換気扇を得ることを目的とする。Furthermore, the present invention provides a sound absorbing structure that ensures a sufficient absorption effect even though the inner dimension of the porous outer peripheral wall is only slightly reduced compared to the inner dimension of the casing, and there is almost no deterioration in fan aerodynamic performance. The purpose is to obtain a ventilation fan with
［課題を解決するための手段］
本発明の換気扇は、渦巻状風路を形成する外周壁（舌部
も含む）全体を硬質の多孔質構造体で一部上記筐体内面
に当接するように形成し、ファン吹き出し口に形成した
外周壁終端係合部に係合させるとともに筐体内面に当接
させることにより位置決めし、上記筐体に一体に締結さ
れるベルマウス付側板で押さえ付け固定するようにした
ものである。[Means for Solving the Problems] In the ventilation fan of the present invention, the entire outer circumferential wall (including the tongue portion) forming the spiral air passage is made of a hard porous structure so as to partially contact the inner surface of the casing. It is positioned by being engaged with the outer circumferential wall end engagement portion formed at the fan outlet and abutting against the inner surface of the housing, and is pressed and fixed by a side plate with a bell mouth that is integrally fastened to the housing. This is how it was done.
また、ベルマウス付側板と外周壁との間に、外形寸法が
上記外周壁寸法以上でファン吸い込み口を嵌挿する孔を
有し、硬質の多孔質構造体からなる多孔質側壁を、上記
ファン吸い込み口を上記孔にはめ込み位置決めし、筐体
に一体に締結される上記ベルマウス付側板でスペーサを
介して押さえ付け固定することにより、上記外周壁端面
と当接味 上記ベルマウス付側板とは上記スペーサによ
り離隔して並行に設けたものである。Further, between the side plate with a bell mouth and the outer circumferential wall, there is a hole having an outer dimension larger than the above-mentioned outer circumferential wall size and into which a fan suction port is inserted, and the porous side wall made of a hard porous structure is connected to the above-mentioned fan. By fitting the suction port into the hole and positioning it, and pressing and fixing it via a spacer with the side plate with a bell mouth that is integrally fastened to the casing, it comes into contact with the end surface of the outer peripheral wall.What is the side plate with a bell mouth? They are provided in parallel and separated by the spacer.
さらに、外周壁を上記の如く硬質の多孔質構造体で形成
して設けるとともに、上記の如く硬質の多孔質構造体か
らなる多孔質側壁を設けたものである。Further, the outer peripheral wall is formed of a hard porous structure as described above, and a porous side wall made of a hard porous structure as described above is provided.
［作用コ
本発明の換気扇は、外周壁を硬質の多孔質構造体で一部
筐体内面に当接するように形成しているので、ファン吹
き出し口に形成した外周壁終端係合部に係合させるとと
もに上記筐体内面に当接させることにより簡単に位置決
めでき、固定もベルマウス付側板で押さえ付けるだけで
よく、構造が簡単で鞘み立て性や寸法精度もよいものに
できる。[Operation] In the ventilation fan of the present invention, the outer circumferential wall is formed of a hard porous structure so as to partially contact the inner surface of the housing, so that the outer circumferential wall engages with the outer circumferential wall end engagement portion formed at the fan outlet. It can be easily positioned by bringing it into contact with the inner surface of the casing, and it can be fixed simply by pressing it with a side plate with a bell mouth, resulting in a simple structure with good sheath erectability and dimensional accuracy.
また、舌部も含んだ多孔質外周壁全体を吸音部として利
用できるため吸音効果も十分確保でき、さらに多孔質外
周壁の内側寸法も相当大きくできるため空力性能も殆ど
低下しない。Furthermore, since the entire porous outer peripheral wall including the tongue portion can be used as a sound absorbing portion, a sufficient sound absorption effect can be ensured, and furthermore, the inner dimensions of the porous outer peripheral wall can be made considerably large, so that aerodynamic performance hardly deteriorates.
また、外周壁を例えば薄い鉄板や樹脂板などで形成し、
外周壁の代わりに寸法的に余裕がある吸い込み側に硬質
の多孔質構造体からなる多孔質側壁を設けて吸音部を確
保した構造にすることによっても、組み立て性や寸法精
度をよくできると同時に吸音効果や空力性能も十分に確
保できる。In addition, the outer peripheral wall is formed of, for example, a thin iron plate or resin plate,
In place of the outer peripheral wall, a porous side wall made of a hard porous structure is provided on the suction side, which has a dimensional margin, to create a structure that secures a sound absorption area, which improves ease of assembly and dimensional accuracy. It also ensures sufficient sound absorption and aerodynamic performance.
さらに、外周壁と側壁の両方を硬質の多孔質構造体で形
成することにより、吸音効果をさらに向上させることが
できる。Furthermore, by forming both the outer peripheral wall and the side wall with a hard porous structure, the sound absorption effect can be further improved.
［実施例］
第１図は本発明の一実施例の換気扇を示す横断面図、第
２図は第１図の■−■線断面図である。[Embodiment] FIG. 1 is a cross-sectional view showing a ventilation fan according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG. 1.
（１）〜（３）及び（５）〜（１０）は上記従来例と同
様のものである。（１４）は上記従来例の柔軟性多孔質
外周壁（４）の代わりに設けた硬質の多孔質外周壁であ
り、筐体（１）の内面に一部が当接する大きさで舌部も
一体に硬質の多孔質構造体で成形されたものである。（
１５）は筐体（１）のファン吹き出し口（７）位置に設
けた外周壁終端係合部の外周壁終端押え部で、硬質の多
孔質外周壁（１４）の吹き出し口位置の位置決めに使わ
れる。この外周壁終端押え部（１５）と筐体（１）内面
の一部に当接することにより位置決めされた硬質の多孔
質外周壁（１４）が、筐体（１）にネジ等で締結される
ベルマウス付側板（９）で押さえつけられることにより
固定されている。この場合、上記硬質の多孔質外周壁（
１４）の吹き出し口位置の間隔を少し小さ目に成形して
おくと、これを多少広げながら上記外周壁終端押え部（
１５）にセットすることによって挟み込む力が働き、フ
ァン吹き出し口（７）位置にさらに正確に位置決めする
ことが可能となる。(1) to (3) and (5) to (10) are similar to the above conventional example. (14) is a hard porous outer circumferential wall provided in place of the flexible porous outer circumferential wall (4) of the conventional example, and is large enough to partially contact the inner surface of the casing (1), and also has a tongue portion. It is integrally molded from a hard porous structure. (
15) is an outer peripheral wall end holding part of the outer peripheral wall end engaging part provided at the fan outlet (7) position of the housing (1), and is used for positioning the outlet position of the hard porous outer peripheral wall (14). be exposed. The hard porous outer peripheral wall (14), which is positioned by coming into contact with this outer peripheral wall end presser (15) and a part of the inner surface of the housing (1), is fastened to the housing (1) with screws or the like. It is fixed by being pressed down by a side plate (9) with a bell mouth. In this case, the hard porous outer peripheral wall (
14) If the interval between the air outlet positions is made slightly smaller, the outer peripheral wall end presser part (
15), a pinching force is applied and it becomes possible to position the fan outlet (7) more accurately.
上記のように構成された換気扇においては、従来例のよ
うなリブ突起（１１）やチャンネル（１２）が不用とな
って筐体（１）のファン吹き出し口（７）位置に設けた
外周壁終端押え部（１５）と筐体（１）の内面の一部だ
けで容易に位置決めでき、固定もベルマウス付側板（９
）で押さえつけるだけで良いため、構造が非常に簡単て
鞘み立て性や寸法精度が格段に向上している。また、リ
ブ状突起（１１）が不必要となるため 筐体（１）の内
側寸法まで多孔質外周壁（１４）を大きくてき（一部当
接させている）、空力性能が向上している。さらにリブ
状突起（１１）や舌部（１３）の部分の表面積も吸音部
として利用できるものになっているため、吸音効果も向
上している。In the ventilation fan configured as described above, the rib protrusion (11) and channel (12) of the conventional example are no longer required, and the outer peripheral wall end is provided at the fan outlet (7) of the housing (1). It can be easily positioned using only the holding part (15) and a part of the inner surface of the housing (1), and can be fixed using the side plate with bell mouth (9).
), the structure is extremely simple and the sheath erectability and dimensional accuracy are greatly improved. In addition, since the rib-like protrusion (11) is no longer necessary, the porous outer peripheral wall (14) is enlarged to the inside dimension of the housing (1) (partially in contact with it), improving aerodynamic performance. . Furthermore, since the surface areas of the rib-like projections (11) and the tongue portions (13) can also be used as sound absorbing parts, the sound absorbing effect is also improved.
また、外周壁の代わりに寸法的に余裕がある吸い込み側
に吸音部を確保した吸音構造の換気扇でも同様の効果が
期待できる。第３図はこの場合の他の実施例を示す縦断
面図で、薄い鉄板や樹脂板等で成形された外周壁（１６
）と ベルマウス付側板（９）との間に、ファン吸い込
み口（１０）が嵌挿する孔、即ちファン吸い込み口（ｌ
Ｏ）の形状の丸穴を有する硬質の多孔質側壁（１７）を
、ベルマウス付側板（９）に取り付けたスペーサ（１８
）によりベルマウス付側板（９）と並行に背面空気Ｎ（
６）を確保した配置で、ファン吸い込み口（１０）を丸
穴にはめ込むことにより位置決めし、ベルマウス付側板
（９）でスペーサ（１８〉を介して押さえつけることに
より固定しである。Furthermore, a similar effect can be expected with a ventilation fan having a sound-absorbing structure in which a sound-absorbing section is provided on the suction side, which has a dimensional margin, instead of the outer peripheral wall. FIG. 3 is a longitudinal cross-sectional view showing another embodiment in this case, in which the outer peripheral wall (16
) and the side plate with a bell mouth (9), there is a hole into which the fan suction port (10) is inserted, that is, a fan suction port (l).
A hard porous side wall (17) having a round hole in the shape of O) is attached to a spacer (18) attached to a side plate (9) with a bell mouth.
), the rear air N (
6), position the fan suction port (10) by fitting it into the round hole, and fix it by pressing it with the side plate (9) with a bell mouth via the spacer (18>).
この場合には吸音部の表面積が上記一実施例より小さく
なっているが、ファン吸い込み口（１０）側に放射伝播
される騒音に対してはより効果的な配置であるため実質
的な吸音効果は殆ど差がない。In this case, the surface area of the sound absorbing part is smaller than in the above embodiment, but since the arrangement is more effective against noise radiated to the fan suction port (10) side, a substantial sound absorbing effect is obtained. There is almost no difference.
しかも、外周壁（１６）の厚さが薄くなっているため内
側寸法をさらに大きくできることにより、空力性能もさ
らに向上している。なお、第３図の実施例では 硬質の
多孔質側壁（１７）の外形形状を筐体（１）の開口面と
ほぼ同じ形状としているが、外周壁（１６）の寸法以上
にすればほぼ同様の効果が期待できる。Moreover, since the thickness of the outer circumferential wall (16) is reduced, the inner dimension can be further increased, thereby further improving the aerodynamic performance. In the embodiment shown in Fig. 3, the external shape of the hard porous side wall (17) is approximately the same as the opening surface of the housing (1), but if the external shape is larger than that of the outer peripheral wall (16), it will be approximately the same. The effects can be expected.
さらに上記両実施例を組み合わせた外周壁と側壁の両方
を硬質の多孔質構造体で成形したものにすることにより
、吸音効果を倍増することが可能となる。この場合、硬
質の多孔質外周壁（１４）と多孔質側壁（＋７）を別々
の部品として成形し、組み立てたものでも良いが、硬質
の多孔質側壁（１７）の外形形状を硬質の多孔質外周壁
（１４）と同一形状にして一体に成形したものにするこ
とにより、組み立てをさらに容易にすることができ、強
度も向上する。なお、背面側の側壁も硬質の多孔質側壁
にすることも考えられるが、ファン吸い込み口（ｌＯ）
側に放射伝播される騒音に対しては、吸音効果がそれほ
ど期待てきないため、大きさやコストが増大し、組み立
て性が悪化することを考えれば得策とは言えない。Furthermore, by combining both of the above embodiments and making both the outer peripheral wall and the side wall molded from a hard porous structure, it is possible to double the sound absorption effect. In this case, the hard porous outer peripheral wall (14) and the porous side wall (+7) may be molded as separate parts and assembled, but the outer shape of the hard porous side wall (17) may be By integrally molding it into the same shape as the outer peripheral wall (14), assembly can be further facilitated and strength can be improved. It is also possible to make the rear side wall a hard porous side wall, but the fan inlet (lO)
Since the sound absorption effect is not expected to be that great for noise that is radiated and propagated to the side, it is not a good idea considering that the size and cost will increase and the ease of assembly will deteriorate.
ところで、硬質の多孔質側壁（１７）を設ける場合には
背面空気層を確保するためにスペーサ（１８）が必要と
なるが、これを硬質の多孔質側壁（１７）と−体で成形
した一つ以上の線状または点状突起とすることにより、
組み立て性をさらに向上させることができる。By the way, when providing a hard porous side wall (17), a spacer (18) is required to ensure an air layer on the back side. By forming two or more linear or point-like projections,
Assemblability can be further improved.
第４図の縦断面図に、この場合のさらに他の実施例の換
気扇を示す。この実施例では、硬質の多孔質外周壁（１
４）を押さえる付近の硬質の側壁（１７）の背面空気層
（６）側に複数の点状突起（１９）を一体で成形した場
合を示しているが、このように外周壁を押さえる位置付
近に点状突起（１９）や線状突起を設けることによって
硬質の多孔質側壁（１７）に余分な曲げ力が加わらない
ようにすることができるため強度上有利となっている。The longitudinal cross-sectional view of FIG. 4 shows a ventilation fan of still another embodiment in this case. In this example, a hard porous outer peripheral wall (1
4) shows a case in which a plurality of dot-like protrusions (19) are integrally molded on the rear air layer (6) side of the hard side wall (17) near the position where the outer circumferential wall is pressed. Providing dotted protrusions (19) or linear protrusions on the hard porous side wall (17) can prevent unnecessary bending force from being applied to the hard porous side wall (17), which is advantageous in terms of strength.
さて、以上の実施例では 硬質の多孔質外周壁（１４）
と多孔質側壁（１７）を構成する多孔質構造体の内部構
造については特に規定してぃながったが、これを同一出
願人により平成１年４月２８日に出願された特願平１−
１１０９９６号明細書の「多孔質構造体」に述べられた
特殊な内部構造の多孔質構造体にすることにより、吸音
性能をさらに向上させることが可能となる。即ち、多孔
質層の比重を層の厚さ方向もしくは面方向に連続的に変
化させたものにすることによって要求される吸音性能上
最適な比重分布にすることができ、また風路側の壁面に
厚さ１００μｍ以下のスキン層を一体で設けることによ
り、低周波での吸音効果をさらに向上させることができ
る。Now, in the above example, the hard porous outer peripheral wall (14)
The internal structure of the porous structure constituting the porous side wall (17) was specifically stipulated in the patent application filed on April 28, 1999 by the same applicant. 1-
By using a porous structure with a special internal structure as described in "Porous Structure" in the specification of No. 110996, it is possible to further improve the sound absorption performance. In other words, by changing the specific gravity of the porous layer continuously in the layer thickness direction or surface direction, it is possible to achieve the optimal specific gravity distribution for the required sound absorption performance. By integrally providing a skin layer with a thickness of 100 μm or less, the sound absorption effect at low frequencies can be further improved.
以下に、この先行出願の明細書の内容から関連する部分
を引用することにより、吸音性能の向上効果について説
明する。The effect of improving sound absorption performance will be explained below by quoting relevant parts from the specification of this prior application.
第６図は第５図の特性図に示す三種類の厚さ方向の空孔
率（即ち比重）分布をもった厚さ１０酊の多孔質層の垂
直入射吸音率特性を示した図である。Fig. 6 is a diagram showing the normal incidence sound absorption coefficient characteristics of a porous layer with a thickness of 10 mm and having three types of porosity (i.e., specific gravity) distributions in the thickness direction shown in the characteristic diagram of Fig. 5. .
曲線Ａ、 Ｃは空孔率が厚さ方向にほぼ一様で、それ
ぞれ約２５％、約１０％のものであり、曲線Ｂは空孔率
が厚さ方向に１０〜２５％の範囲で連続的に変化してい
るものである。図から判るように、空孔率分布を有する
サンプル（曲線Ｂ）が最も吸音率特性が良いことがわか
る。In curves A and C, the porosity is almost uniform in the thickness direction, about 25% and about 10%, respectively, and in curve B, the porosity is continuous in the range of 10 to 25% in the thickness direction. This is something that is changing. As can be seen from the figure, the sample with the porosity distribution (curve B) has the best sound absorption coefficient characteristics.
次に、多孔質層の面方向に空孔率（比重）を変化させる
ことによる吸音特性の改善効果について説明する。第７
図の特性図は厚さｌＯｗ＋ｎの三種類のサンプルの空孔
率の変化を示し、曲線Ａ→Ｂ−Ｃの順で空孔率が小さく
なっている。このときの吸音率特性を第８図に示す。こ
の図より、特に音波入射面側の空孔率を小さくすれば（
曲線Ｃに相当）、低周波域の吸音率が向上する。従って
、多孔質層の面方向の空孔率に分布を持たせることによ
り、広い周波数帯域で良好な吸音特性を得ることができ
る。Next, the effect of improving sound absorption characteristics by changing the porosity (specific gravity) in the planar direction of the porous layer will be explained. 7th
The characteristic diagram shown in the figure shows changes in the porosity of three types of samples with thickness lOw+n, and the porosity decreases in the order of curve A→B-C. The sound absorption coefficient characteristics at this time are shown in FIG. From this figure, if we reduce the porosity especially on the sound wave incidence side (
(corresponding to curve C), the sound absorption coefficient in the low frequency range is improved. Therefore, by providing a distribution in the porosity in the planar direction of the porous layer, good sound absorption characteristics can be obtained in a wide frequency band.
次に、多孔質層の表面にスキン層を一体で設けた場合の
効果について説明する。第１Ｏ図は第９図の特性図に示
す厚さ方向の空孔率（比重）分布をもった厚さ１０ｇ＋
ｍの多孔質層の垂直入射吸音率特性を示した図である。Next, the effect when the skin layer is integrally provided on the surface of the porous layer will be explained. Figure 1O shows a thickness of 10g+ with the porosity (specific gravity) distribution in the thickness direction shown in the characteristic diagram of Figure 9.
FIG. 3 is a diagram showing normal incidence sound absorption coefficient characteristics of a porous layer of m.
図から明らかなように、このサンプルでは４００Ｈｚと
いう低周波で吸音率が最大となり、しかもその値が９０
を越える良好な吸音特性が得られた。このとき、このサ
ンプルの音波入射面側の低空孔率部を顕微鏡で破断観察
した結果、その表面が厚さ３０μイ程度のほぼ非通気性
のスキン層になっていることが見いだされた。さらにス
キン層の厚さを種々変更して吸音特性の試験を行った結
果、スキン層が１００μ鰯を越えると、スキン層が質量
としてではなく弾性膜（バネ系）として働くようになり
、最高吸音率の周波数は逆に上がってしまって所要の効
果が得られなかった。従って、１００μｍ以下が妥当で
あることを確認した。As is clear from the figure, the sound absorption coefficient of this sample reaches its maximum at a low frequency of 400 Hz, and the value is 90 Hz.
Good sound absorption properties were obtained. At this time, as a result of fracture observation of the low porosity part on the sound wave incident surface side of this sample using a microscope, it was found that the surface was a nearly impermeable skin layer with a thickness of about 30 μm. Furthermore, as a result of testing the sound absorption properties by varying the thickness of the skin layer, we found that when the skin layer exceeds 100μ, the skin layer starts to act as an elastic membrane (spring system) rather than as a mass, resulting in maximum sound absorption. On the contrary, the frequency of the rate increased and the desired effect could not be obtained. Therefore, it was confirmed that 100 μm or less is appropriate.
［発明の効果コ
本発明の換気扇は、以上説明したように構成されている
ので、以下に記載されるような効果を奏する。[Effects of the Invention] Since the ventilation fan of the present invention is configured as described above, it produces the effects described below.
渦巻状風路を形成する外周壁全体を硬質の多孔質構造体
で一部上記筐体内面に当接するように形成し、ファン吹
き出し口に形成した外周壁終端係合部に係合させるとと
もに筐体内面に当接させることにより位置決めし、上記
筐体に一体に締結されるベルマウス付側板で押さえ付け
固定するようにしたので、簡単な構造で組み立て性や寸
法精度が良いだけでなく、空力性能や吸音効果も向上さ
せることができる。The entire outer peripheral wall forming the spiral air passage is formed of a hard porous structure so as to partially contact the inner surface of the casing, and is engaged with the outer peripheral wall end engagement portion formed at the fan outlet, and the casing The position is determined by bringing it into contact with the inner surface of the body, and it is pressed and fixed by the side plate with a bell mouth that is integrally fastened to the above-mentioned housing, so it not only has a simple structure with good assembly and dimensional accuracy, but also has excellent aerodynamics. Performance and sound absorption effects can also be improved.
また、寸法的に余裕のある吸い込み側、ベルマウス付側
板と外周壁との間に、ファン吸い込み口を嵌挿する孔を
有し、硬質の多孔質構造体からなる多孔質側壁を、上記
ファン吸い込み口を上記孔にはめ込み位置決めし、上記
ベルマウス付側板でスペーサを介して押さえ付け固定し
て、硬質の多孔質側壁と背面空気層を設けた構造にする
ことにより、上記と同様別み立て性や寸法精度が良好で
、空力性能や吸音効果も良いものにすることができる。In addition, on the suction side, which has sufficient dimensions, there is a hole for inserting the fan suction port between the side plate with a bell mouth and the outer peripheral wall, and the porous side wall made of a hard porous structure is connected to the fan. The suction port is inserted into the hole and positioned, and the side plate with the bell mouth is pressed and fixed via a spacer to create a structure with a hard porous side wall and an air layer on the back, allowing it to be installed separately in the same way as above. It has good properties and dimensional accuracy, and can also have good aerodynamic performance and sound absorption effect.
さらに、外周壁を上記の如く硬質の多孔質構造体で形成
し、硬質の多孔質構造体からなる多孔質側壁をも設けた
ので、吸音効果をさらに向上させることができる。Furthermore, since the outer peripheral wall is formed of a hard porous structure as described above, and the porous side wall made of a hard porous structure is also provided, the sound absorption effect can be further improved.
第１図は本発明の一実施例の換気扇を示す横断面図、第
２図は第１図の■−■線断面図、第３図は本発明の他の
実施例を示す縦断面図、第４図は本発明のさらに他の実
施例を示す縦断面図、第５図は本発明に係わる多孔質構
造体の厚さに対する比重（即ち空孔率）を示す特性図、
第６図は第５図に空孔率曲線を示した多孔質構造体の垂
直入射吸音率を示す特性図、第７図は本発明に係わる面
方向に比重（空孔率）を変化させた多孔質構造体の厚さ
に対する空孔率を示す特性図、第８図は第７図に空孔率
曲線を示した多孔質構造体の垂直入射吸音率を示す特性
図、第９図は本発明に係わる表面にスキン層を有する多
孔質構造体の厚さに対する空孔率を示す特性図、第１Ｏ
図は第９図に空孔率曲線を示した多孔質構造体の垂直入
射吸音率を示す特性図、第１１図は従来の吸音構造を有
する換気扇を示す縦断面図、第１２図は同要部拡大分解
斜視図である。
図において、（１）は筐体、（２）は遠心羽根車、（３
）は電動機、（６）は背面空気層、（７）はファン吹き
出し口、（９）はベルマウス付側板、（１４）は硬質の
多孔質外周壁、（１５）は外周壁終端係合部、（１７）
は硬質の多孔質側壁、（ｊ８）はスペーサである。
なお、図中、同一符号は同一または相当部分を示す。FIG. 1 is a cross-sectional view showing a ventilation fan according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a longitudinal cross-sectional view showing another embodiment of the present invention. FIG. 4 is a longitudinal cross-sectional view showing still another embodiment of the present invention, and FIG. 5 is a characteristic diagram showing the specific gravity (i.e., porosity) with respect to the thickness of the porous structure according to the present invention.
FIG. 6 is a characteristic diagram showing the normal incidence sound absorption coefficient of the porous structure whose porosity curve is shown in FIG. 5, and FIG. 7 is a characteristic diagram showing the normal incidence sound absorption coefficient of the porous structure whose porosity curve is shown in FIG. Figure 8 is a characteristic diagram showing the porosity versus thickness of the porous structure. Figure 8 is a characteristic diagram showing the normal incidence sound absorption coefficient of the porous structure whose porosity curve is shown in Figure 7. Figure 9 is the characteristic diagram shown in this book. Characteristic diagram showing porosity versus thickness of a porous structure having a skin layer on the surface according to the invention, No. 1 O
Figure 9 is a characteristic diagram showing the normal incidence sound absorption coefficient of a porous structure with a porosity curve, Figure 11 is a vertical cross-sectional view showing a ventilation fan with a conventional sound-absorbing structure, and Figure 12 is the same diagram. FIG. In the figure, (1) is the housing, (2) is the centrifugal impeller, and (3
) is the electric motor, (6) is the rear air layer, (7) is the fan outlet, (9) is the side plate with a bell mouth, (14) is the hard porous outer peripheral wall, and (15) is the outer peripheral wall end engagement part. , (17)
is a hard porous side wall, and (j8) is a spacer. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (3)
と反対側の背面に取り付けられた電動機、この電動機に
回転駆動される遠心羽根車、この遠心羽根車を囲む渦巻
状風路を形成する外周壁、上記渦巻状風路終端部に位置
する上記筐体面に設けられたファン吹き出し口、及び上
記開口面に配設されるベルマウス状のファン吸い込み口
を有するベルマウス付側板を備える換気扇において、上
記外周壁を硬質の多孔質構造体で一部上記筐体内面に当
接するように形成し、上記ファン吹き出し口に形成した
外周壁終端係合部に係合させるとともに上記筐体内面に
当接させることにより位置決めし、上記筐体に一体に締
結される上記ベルマウス付側板で押さえ付け固定するよ
うにしたことを特徴とする換気扇。(1) A box-shaped housing with an opening on one side, an electric motor attached to the back of the housing opposite to the opening side, a centrifugal impeller rotationally driven by the electric motor, and a spiral shape surrounding the centrifugal impeller. With a bell mouth having an outer peripheral wall forming an air passage, a fan outlet provided on the casing surface located at the end of the spiral air passage, and a bell mouth-shaped fan intake provided on the opening surface. In the ventilation fan having a side plate, the outer peripheral wall is formed of a hard porous structure so as to partially contact the inner surface of the casing, and is engaged with the outer peripheral wall end engaging portion formed at the fan outlet. A ventilation fan, characterized in that the fan is positioned by abutting against the inner surface of the housing, and is pressed and fixed by the side plate with a bell mouth that is integrally fastened to the housing.
と反対側の背面に取り付けられた電動機、この電動機に
回転駆動される遠心羽根車、この遠心羽根車を囲む渦巻
状風路を形成する外周壁、上記渦巻状風路終端部に位置
する上記筐体面に設けられたファン吹き出し口、及び上
記開口面に配設されるベルマウス状のファン吸い込み口
を有するベルマウス付側板を備える換気扇において、上
記ベルマウス付側板と外周壁との間に、外形寸法が上記
外周壁寸法以上で上記ファン吸い込み口を嵌挿する孔を
有し、硬質の多孔質構造体からなる多孔質側壁を、上記
ファン吸い込み口を上記孔にはめ込み位置決めし、上記
筐体に一体に締結される上記ベルマウス付側板でスペー
サを介して押さえ付け固定することにより、上記外周壁
端面と当接し、上記ベルマウス付側板とは上記スペーサ
により離隔して並行に設けたことを特徴とする換気扇。(2) A box-shaped housing with an opening on one side, an electric motor attached to the back of the housing opposite to the opening side, a centrifugal impeller rotationally driven by the electric motor, and a spiral shape surrounding the centrifugal impeller. With a bell mouth having an outer peripheral wall forming an air passage, a fan outlet provided on the casing surface located at the end of the spiral air passage, and a bell mouth-shaped fan intake provided on the opening surface. In the ventilation fan equipped with a side plate, a hole is formed between the side plate with a bell mouth and the outer peripheral wall, the outer size of which is larger than the outer peripheral wall size, and into which the fan suction port is inserted, and the hole is made of a hard porous structure. The side wall is positioned by fitting the fan suction port into the hole, and is pressed and fixed via a spacer by the side plate with a bell mouth, which is integrally fastened to the housing, so as to come into contact with the end surface of the outer peripheral wall, A ventilation fan characterized in that the above-mentioned side plate with a bell mouth is provided in parallel and separated by the above-mentioned spacer.
孔質構造体で一部筐体内面に当接するように形成し、フ
ァン吹き出し口に形成した外周壁終端係合部に係合させ
るとともに上記筺体内面に当接させることにより位置決
めし、多孔質側壁とともにベルマウス付側板で押さえ付
け固定するようにしたことを特徴とする換気扇。(3) In the product according to claim 2, the outer circumferential wall is formed of a hard porous structure so as to partially contact the inner surface of the housing, and is engaged with the outer circumferential wall end engagement portion formed at the fan outlet. The ventilation fan is positioned by abutting against the inner surface of the housing, and is pressed and fixed together with the porous side wall by a side plate with a bell mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2150793A JP2707802B2 (en) | 1990-06-07 | 1990-06-07 | Ventilation fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2150793A JP2707802B2 (en) | 1990-06-07 | 1990-06-07 | Ventilation fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0441996A true JPH0441996A (en) | 1992-02-12 |
| JP2707802B2 JP2707802B2 (en) | 1998-02-04 |
Family
ID=15504559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2150793A Expired - Lifetime JP2707802B2 (en) | 1990-06-07 | 1990-06-07 | Ventilation fan |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2707802B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007218454A (en) * | 2006-02-14 | 2007-08-30 | Fujika:Kk | Cracker, cylindrical body for cracker and cracker manufacturing method |
| WO2008053867A1 (en) * | 2006-11-02 | 2008-05-08 | Panasonic Corporation | Centrifugal fan |
| JP2008138660A (en) * | 2006-11-02 | 2008-06-19 | Matsushita Electric Ind Co Ltd | Centrifugal blower |
| GB2476726A (en) * | 2009-12-31 | 2011-07-06 | Intel Corp | Cooling fan with micro-porous sound absorber |
| US8123468B2 (en) | 2006-11-02 | 2012-02-28 | Panasonic Corporation | Centrifugal fan |
| US9435350B2 (en) | 2009-04-07 | 2016-09-06 | Panasonic Intellectual Property Management Co., Ltd. | Air blowing device |
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| JPS58194427U (en) * | 1982-06-22 | 1983-12-24 | 株式会社東芝 | Air conditioner indoor unit |
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| JPS56146096A (en) * | 1980-04-15 | 1981-11-13 | Mitsubishi Electric Corp | Blower |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007218454A (en) * | 2006-02-14 | 2007-08-30 | Fujika:Kk | Cracker, cylindrical body for cracker and cracker manufacturing method |
| WO2008053867A1 (en) * | 2006-11-02 | 2008-05-08 | Panasonic Corporation | Centrifugal fan |
| JP2008138660A (en) * | 2006-11-02 | 2008-06-19 | Matsushita Electric Ind Co Ltd | Centrifugal blower |
| US8123468B2 (en) | 2006-11-02 | 2012-02-28 | Panasonic Corporation | Centrifugal fan |
| US9435350B2 (en) | 2009-04-07 | 2016-09-06 | Panasonic Intellectual Property Management Co., Ltd. | Air blowing device |
| GB2476726A (en) * | 2009-12-31 | 2011-07-06 | Intel Corp | Cooling fan with micro-porous sound absorber |
| GB2476726B (en) * | 2009-12-31 | 2012-09-26 | Intel Corp | Quiet system cooling using coupled optimization between integrated micro porous absorbers and rotors |
| US9170616B2 (en) | 2009-12-31 | 2015-10-27 | Intel Corporation | Quiet system cooling using coupled optimization between integrated micro porous absorbers and rotors |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2707802B2 (en) | 1998-02-04 |
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