JPH0894146A - Ceiling embedded type ventilating fan - Google Patents
Ceiling embedded type ventilating fanInfo
- Publication number
- JPH0894146A JPH0894146A JP6226571A JP22657194A JPH0894146A JP H0894146 A JPH0894146 A JP H0894146A JP 6226571 A JP6226571 A JP 6226571A JP 22657194 A JP22657194 A JP 22657194A JP H0894146 A JPH0894146 A JP H0894146A
- Authority
- JP
- Japan
- Prior art keywords
- orifice
- suction
- casing
- noise
- gap
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、換気送風機器に使用さ
れる天井埋込形換気扇に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling-embedded ventilation fan used for ventilation and ventilation equipment.
【０００２】[0002]
【従来の技術】近年、この種の天井埋込形換気扇は、本
体内で発生する騒音を遮音及び共鳴騒音の低下が求めら
れている。2. Description of the Related Art In recent years, ceiling-mounted ventilation fans of this type are required to insulate noise generated in the main body and reduce resonance noise.
【０００３】従来、この種の天井埋込形換気扇は、図９
及び図１０の構成が一般的であった。以下、その構成に
ついて図を参照しながら説明する。Conventionally, a ceiling-embedded ventilation fan of this type is shown in FIG.
And the configuration of FIG. 10 was general. The configuration will be described below with reference to the drawings.
【０００４】図に示すように下面を開口した本体２１
と、この本体２１内の天面２２に羽根車２３を固着した
電動機２４を設け、前記羽根車２３の周囲を取り囲む渦
巻ケーシング２５と、吸込口２６を有する吸込ケーシン
グ２７と、この吸込ケーシング２７の下面にグリル２８
と、前記本体２１の一側面に設けた吐出口２９と備えて
いる。As shown in the figure, a main body 21 having an open bottom surface
An electric motor 24 having an impeller 23 fixed to the top surface 22 of the main body 21 is provided, and a spiral casing 25 surrounding the impeller 23, a suction casing 27 having a suction port 26, and a suction casing 27 of the suction casing 27. Grill 28 on the bottom
And a discharge port 29 provided on one side surface of the main body 21.
【０００５】上記構成において回転騒音や、渦巻ケーシ
ングを通るときに発生する渦による乱流騒音や、渦巻ケ
ーシング内で発生した音が容積の中で増幅される共鳴騒
音が前記吸込口から吸込側空間へ放射されることとな
る。In the above structure, rotational noise, turbulent noise due to vortices generated when passing through the spiral casing, and resonance noise in which the sound generated in the spiral casing is amplified in the volume are the suction side space from the suction port. Will be emitted to.
【０００６】[0006]
【発明が解決しようとする課題】このような従来の天井
埋込形換気扇では、運転時に羽根車２３が回転すると、
吸込口２６より空気を吸引し、羽根車２３により昇圧
し、渦巻ケーシング２５の内部ｄを通り吐出口２９より
吐出する。そして、前記吸込口２６より吸引した空気
は、羽根車２３で昇圧されるときに発生する回転騒音
や、渦巻ケーシング２５を通るときに発生する渦による
乱流騒音や、渦巻ケーシング２５内で発生した音が容積
の中で増幅される共鳴騒音が前記吸込口２６から吸込側
空間ｃへ放射されるという問題があった。In such a conventional ceiling-embedded ventilation fan, when the impeller 23 rotates during operation,
The air is sucked from the suction port 26, the pressure is increased by the impeller 23, and the air is discharged from the discharge port 29 through the inside d of the spiral casing 25. The air sucked from the suction port 26 is generated in the swirl casing 25 by the rotational noise generated when the pressure is increased by the impeller 23, the turbulent noise caused by the vortex generated when passing through the spiral casing 25, and the swirl casing 25. There has been a problem that resonance noise, in which sound is amplified in the volume, is radiated from the suction port 26 to the suction side space c.
【０００７】本発明は、上記課題を解決するもので、乱
流騒音や共鳴騒音を減少させ、外部への騒音放射量を小
さくすることを第一の目的とする。The present invention is intended to solve the above problems, and it is a first object of the present invention to reduce turbulent flow noise and resonance noise and reduce the amount of noise radiation to the outside.
【０００８】第２の目的はダクト配管が施工時に任意に
変化し、共鳴騒音の周波数が変化することに対応でき、
羽根車や渦巻ケーシング内で発生した騒音が遮音及び共
鳴騒音を減少させ、外部への騒音放射量を小さくするこ
とにある。The second purpose is to cope with the fact that the frequency of the resonance noise changes as the duct piping changes arbitrarily during construction.
The noise generated in the impeller and the spiral casing reduces sound insulation and resonance noise, and reduces the amount of noise radiation to the outside.
【０００９】第３の目的は共鳴周波数が複数発生する場
合に、共鳴容積を複数持つことで羽根車や渦巻ケーシン
グ内で発生した騒音が遮音及び共鳴騒音を減少させ、外
部への騒音放射量が小さくなることにある。A third object is that when a plurality of resonance frequencies are generated, by having a plurality of resonance volumes, noise generated in the impeller or the spiral casing reduces sound insulation and resonance noise, and the amount of noise radiation to the outside is reduced. To be smaller.
【００１０】第４の目的は間隙ｉにおいて発生しやすい
乱れを防止するとともに、フイルムによる空気圧力変化
の伝達により間隙が空いている場合と同等の効果が得ら
れ、羽根車や渦巻ケーシング内で発生した騒音が遮音及
び共鳴騒音を減少させ、外部への騒音放射量が小さくな
ることにある。A fourth object is to prevent turbulence which is likely to occur in the gap i, and to obtain the same effect as in the case where there is a gap due to transmission of air pressure change by the film, which is generated in the impeller or the spiral casing. The generated noise reduces sound insulation and resonance noise, and the amount of noise radiation to the outside is reduced.
【００１１】第５の目的は羽根車や渦巻ケーシング内で
発生した騒音が遮音及び共鳴騒音及び消音の相乗効果に
より減少させ、外部への騒音放射量が小さくなることに
ある。A fifth object is to reduce the noise generated in the impeller or the spiral casing by the synergistic effect of sound insulation, resonance noise and noise reduction, and reduce the amount of noise radiation to the outside.
【００１２】第６の目的はオリフィスでの圧力損失を低
減しかつ、羽根車や渦巻ケーシング内で発生した騒音が
遮音及び共鳴騒音を減少させ、外部への騒音放射量が小
さくなることにある。A sixth object is to reduce the pressure loss at the orifice, reduce the noise generated in the impeller and the spiral casing to reduce the sound insulation and the resonance noise, and reduce the noise radiation amount to the outside.
【００１３】第７の目的は羽根車や渦巻ケーシング内で
発生した騒音が遮音及び共鳴騒音及び消音の相乗効果に
より減少させ、外部への騒音放射量が小さくなることに
ある。A seventh object is to reduce the noise generated in the impeller or the spiral casing by the synergistic effect of sound insulation, resonance noise and noise reduction, and reduce the amount of noise radiation to the outside.
【００１４】[0014]
【課題を解決するための手段】本発明の天井埋込形換気
扇は、上記第１の目的を達成するために第１の手段は、
下面を開口した本体と、この本体内の天面に羽根車を固
着した電動機を設け、前記羽根車の周囲を囲む渦巻ケー
シングと、ベルマウス状の吸込口を有する吸込ケーシン
グと吐出口とを備え、前記吸込ケーシングと間隙ｈを隔
て、前記吸込ケーシングの吸込口と同等あるいは小さな
吸込孔を有するオリフィスの端部と前記吸込ケーシング
の下端とを間隙ｉを隔てて設け、このオリフィスより下
面の前記本体の下面開口部にグリルを設けた天井埋込形
換気扇としたものである。In the ceiling-embedded ventilation fan of the present invention, the first means is to achieve the above first object.
Provided with a main body having an open lower surface, an electric motor having an impeller fixed to the top surface of the main body, a spiral casing surrounding the impeller, a suction casing having a bellmouth-shaped suction port, and a discharge port. An end of an orifice having a suction hole equivalent to or smaller than the suction port of the suction casing and a lower end of the suction casing are provided with a gap i, and the main body below the orifice is provided. It is a ceiling-embedded ventilation fan with a grill provided at the lower opening of the.
【００１５】また、第２の目的を達成するための第２の
手段は、下面を開口した本体と、この本体内の天面に羽
根車を固着した電動機を設け、前記羽根車の周囲を囲む
渦巻ケーシングと、ベルマウス状の吸込口を有する吸込
ケーシングと吐出口を備え、前記吸込ケーシングの吸込
口より同等あるいは小さな吸込孔を有するオリフィスに
内接または外接する可動可能なリング状のガイドを設
け、このガイドの上端と前記吸込ケーシングの下端との
間隙を隔て、前記吸込ケーシングと前記オリフィスの間
隙ｈを変化できるように配置し、このオリフィスより下
面の前記本体の下面開口部にグリルを設けた天井埋込形
換気扇としたものである。A second means for achieving the second object is to provide a main body having a lower surface opened and an electric motor having an impeller fixed to the top surface of the main body, and enclose the circumference of the impeller. A swirl casing, a suction casing having a bellmouth-shaped suction port, and a discharge port are provided, and a movable ring-shaped guide that is inscribed or circumscribed in an orifice having a suction hole equal to or smaller than the suction port of the suction casing is provided. A gap is provided between the upper end of the guide and the lower end of the suction casing so that the gap h between the suction casing and the orifice can be changed, and a grill is provided in the lower surface opening of the main body below the orifice. It is a ceiling-mounted ventilation fan.
【００１６】また、第３の目的を達成するための第３の
手段は、吸込ケーシングとオリフィスとの間隙ｈの間に
複数枚の仕切板をオリフィスと間隙ｊを隔てて設けた天
井埋込形換気扇としたものである。A third means for achieving the third object is a ceiling-embedded type in which a plurality of partition plates are provided in a gap h between the suction casing and the orifice with a gap between the orifice and the gap j. It is a ventilation fan.
【００１７】また、第４の目的を達成するための第４の
手段は、間隙ｉにフィルム材を取付けた天井埋込形換気
扇としたものである。A fourth means for achieving the fourth object is a ceiling-embedded ventilation fan in which a film material is attached to the gap i.
【００１８】また、第５の目的を達成するための第５の
手段は、オリフィス部分に多孔質の焼結材を用いた天井
埋込形換気扇としたものである。A fifth means for achieving the fifth object is a ceiling-embedded ventilation fan using a porous sintered material in the orifice portion.
【００１９】また、第６の目的を達成するための第６の
手段は、オリフィス部分に細かい繊維材を植毛した天井
埋込形換気扇としたものである。A sixth means for achieving the sixth object is a ceiling-embedded ventilation fan in which fine fiber material is planted in the orifice portion.
【００２０】また、第７の目的を達成するための第７の
手段は、吸込ケーシングとオリフィスとの間隙に通風部
を有した吸音材を充填した天井埋込形換気扇としたもの
である。A seventh means for achieving the seventh object is a ceiling-embedded ventilation fan in which a sound absorbing material having a ventilation portion is filled in a gap between the suction casing and the orifice.
【００２１】[0021]
【作用】本発明は上記した第１の手段の構成により、羽
根車や渦巻ケーシング内で発生した騒音が遮音及び共鳴
騒音を減少させ、外部への騒音放射量が小さくなること
となる。According to the present invention, by the structure of the above-mentioned first means, noise generated in the impeller and the spiral casing reduces sound insulation and resonance noise, and the amount of noise radiation to the outside is reduced.
【００２２】また、第２の手段の構成により、ダクト配
管が施工時に任意に変化し、共鳴騒音の周波数が変化す
ることに対応でき、羽根車や渦巻ケーシング内で発生し
た騒音が遮音及び共鳴騒音を減少させ、外部への騒音放
射量が小さくなることとなる。Further, by the configuration of the second means, it is possible to cope with the fact that the duct piping is arbitrarily changed at the time of construction and the frequency of the resonance noise is changed, and the noise generated in the impeller or the spiral casing is sound insulation and resonance noise. Will be reduced, and the amount of noise radiation to the outside will be reduced.
【００２３】また、第３の手段の構成により、共鳴周波
数が複数発生する場合に、共鳴容積を複数持つことで羽
根車や渦巻ケーシング内で発生した騒音が遮音及び共鳴
騒音を減少させ、外部への騒音放射量が小さくなること
となる。Further, according to the structure of the third means, when a plurality of resonance frequencies are generated, by having a plurality of resonance volumes, noise generated in the impeller or the spiral casing reduces sound insulation and resonance noise, and is transmitted to the outside. Will reduce the noise radiation amount.
【００２４】また、第４の手段の構成により、間隙ｉに
おいて発生しやすい乱れを防止するとともに、フイルム
による空気圧力変化の伝達により間隙が空いている場合
と同等の効果が得られ、羽根車や渦巻ケーシング内で発
生した騒音が遮音及び共鳴騒音を減少させ、外部への騒
音放射量が小さくなることとなる。Further, the structure of the fourth means prevents turbulence which is likely to occur in the gap i, and has the same effect as when the gap is vacant due to the transmission of air pressure change by the film. The noise generated in the spiral casing reduces sound insulation and resonance noise, and the amount of noise radiation to the outside is reduced.
【００２５】また、第５の手段の構成により、羽根車や
渦巻ケーシング内で発生した騒音が遮音及び共鳴騒音及
び消音の相乗効果により減少させ、外部への騒音放射量
が小さくなることとなる。Further, with the structure of the fifth means, the noise generated in the impeller or the spiral casing is reduced by the synergistic effect of sound insulation, resonance noise and noise reduction, and the amount of noise radiation to the outside is reduced.
【００２６】また、第６の手段の構成により、オリフィ
スでの圧力損失を低減しかつ、羽根車や渦巻ケーシング
内で発生した騒音が遮音及び共鳴騒音を減少させ、外部
への騒音放射量が小さくなることとなる。Further, by the constitution of the sixth means, the pressure loss at the orifice is reduced, the noise generated in the impeller or the spiral casing reduces the sound insulation and the resonance noise, and the noise radiation amount to the outside is small. Will be.
【００２７】また、第７の手段の構成により、羽根車や
渦巻ケーシング内で発生した騒音が遮音及び共鳴騒音及
び消音の相乗効果により減少させ、外部への騒音放射量
が小さくなることとなる。Further, with the configuration of the seventh means, the noise generated in the impeller or the spiral casing is reduced by the synergistic effect of sound insulation, resonance noise and silencing, and the amount of noise radiation to the outside is reduced.
【００２８】[0028]
【実施例】以下本発明の第１実施例について、図１およ
び図２を参照しながら説明する。なお従来例と同一箇所
には同一番号を付けて詳細な説明は省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. The same parts as those in the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.
【００２９】図に示すように、吸込口２６を有する吸込
ケーシング２７と間隙ｈを隔て前記吸込口２６より同等
あるいは小さな吸込孔２を有するオリフィス３を前記吸
込ケーシング２７の下端３０と前記オリフィス３の端部
１とを間隙ｉを隔てて設け、このオリフィス３の下面に
グリル２８を備えたものである。As shown in the drawing, an orifice 3 having a suction hole 2 equal to or smaller than the suction port 26 and a suction casing 27 having a suction port 26 is provided with a lower end 30 of the suction casing 27 and the orifice 3. The end portion 1 and the end portion 1 are provided with a gap i therebetween, and a grill 28 is provided on the lower surface of the orifice 3.
【００３０】上記構成において、羽根車２３が回転する
と、吸込空気はグリル２８からオリフィス３の吸込孔２
を通り、前記吸込ケーシング２７の吸込口２６より羽根
車２３に入り羽根車２３により昇圧され、渦巻ケーシン
グ２５の内部ｄを通り吐出口２９より吐出される。この
とき前記羽根車２３で昇圧されるときに発生する回転騒
音や、渦巻ケーシング２５を通るときに発生する渦によ
る乱流騒音や、渦巻ケーシング２５内で発生した音が容
積の中で増幅される共鳴騒音が前記吸込口２６から吸込
側空間ｃへ放射されるが、オリフィス３が有るため一部
の騒音は遮音および消音され吸込側空間ｃへは放射され
ない。In the above structure, when the impeller 23 rotates, the suction air is drawn from the grill 28 into the suction hole 2 of the orifice 3.
Through the suction port 26 of the suction casing 27 to enter the impeller 23, the pressure of which is increased by the impeller 23 and the discharge from the discharge port 29 through the inside d of the spiral casing 25. At this time, the rotational noise generated when the pressure is increased by the impeller 23, the turbulent noise due to the vortex generated when passing through the spiral casing 25, and the sound generated inside the spiral casing 25 are amplified in the volume. Resonance noise is radiated from the suction port 26 to the suction side space c, but because of the presence of the orifice 3, some noise is insulated and muted, and is not radiated to the suction side space c.
【００３１】なお、本体の寸法が縦幅２６０ｍｍ、横幅
２６０ｍｍ、高さ２００ｍｍであり、吐出ダクト径がφ
１５０ｍｍであるとき、間隙ｈの寸法範囲を２０〜１０
０ｍｍとし、間隙ｉの寸法範囲を１〜１０ｍｍとする場
合に、消音効果が特に得られやすい。図１１に本発明の
天井埋込形換気扇と従来の天井埋込形換気扇の騒音特性
比較を示す。The dimensions of the main body are 260 mm in length, 260 mm in width and 200 mm in height, and the diameter of the discharge duct is φ.
When it is 150 mm, the size range of the gap h is 20 to 10
When the size is 0 mm and the size range of the gap i is 1 to 10 mm, the silencing effect is particularly easy to obtain. FIG. 11 shows a noise characteristic comparison between the ceiling-embedded ventilation fan of the present invention and a conventional ceiling-embedded ventilation fan.
【００３２】つぎに本発明の第２実施例について図３を
参照しながら説明する。なお第１実施例と同一箇所には
同一番号を付けて詳細な説明は省略する。Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.
【００３３】図に示すように、吸込口２６を有する吸込
ケーシング２７の下端３０と上端７とを間隙ｉを隔て前
記吸込口２６より大きいあるいは同等なリング状のガイ
ド６を設置し、吸込ケーシング２７と前記吸込口２６よ
り同等あるいは小さな吸込孔４を有するオリフィス５を
端部１が前記ガイド６の前記上端７から下端８まで可変
でき、前記吸込ケーシング２７と前記オリフィス５の間
隙ｈを変化できるように配置し、このオリフィス５の下
面にグリル２８を備えたものである。As shown in the figure, the lower end 30 and the upper end 7 of the suction casing 27 having the suction port 26 are provided with a ring-shaped guide 6 which is larger than or equivalent to the suction port 26 with a gap i between them. With respect to the orifice 5 having the suction hole 4 which is equal to or smaller than the suction port 26, the end portion 1 can be changed from the upper end 7 to the lower end 8 of the guide 6, and the gap h between the suction casing 27 and the orifice 5 can be changed. And a grill 28 is provided on the lower surface of the orifice 5.
【００３４】上記構成において、羽根車２３が回転する
と、吸込空気はグリル２８からオリフィス３の吸込孔２
を通り、ガイド６を経由して前記吸込ケーシング２７の
吸込口２６より羽根車２３に入り羽根車２３により昇圧
され、渦巻ケーシング２５の内部ｄを通り吐出口２９よ
り吐出される。このとき前記羽根車２３で昇圧されると
きに発生する回転騒音や、渦巻ケーシング２５を通ると
きに発生する渦による乱流騒音や、渦巻ケーシング２５
内で発生した音が容積の中で増幅される共鳴騒音が前記
吸込口２６から吸込側空間ｃへ放射されるが、オリフィ
ス５が有るため一部の騒音は遮音および消音され吸込側
空間ｃへは放射されない。また、施工時にダクト配管の
長さが変化する場合に発生する共鳴騒音の周波数が変化
するためオリフィス５を可動することで容積を変化さ
せ、消音効果周波数を一致させることができる。In the above structure, when the impeller 23 is rotated, the suction air flows from the grill 28 to the suction hole 2 of the orifice 3.
Through the guide 6, enters the impeller 23 from the suction port 26 of the suction casing 27, is pressurized by the impeller 23, and is discharged from the discharge port 29 through the inside d of the spiral casing 25. At this time, the rotation noise generated when the pressure is increased by the impeller 23, the turbulent noise due to the vortex generated when passing through the spiral casing 25, and the spiral casing 25.
The resonance noise in which the sound generated inside is amplified in the volume is radiated from the suction port 26 to the suction side space c, but since the orifice 5 is present, part of the noise is blocked and muted to the suction side space c. Is not emitted. Further, since the frequency of resonance noise generated when the length of the duct pipe changes during construction, the volume can be changed by moving the orifice 5 and the sound deadening effect frequencies can be matched.
【００３５】つぎに本発明の第３実施例について図４を
参照しながら説明する。なお第１実施例と同一箇所には
同一番号を付けて詳細な説明は省略する。Next, a third embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.
【００３６】図に示すように、吸込口２６を有する吸込
ケーシング２７と間隙ｈを隔て前記吸込口２６より同等
あるいは小さな吸込孔２を有するオリフィス３を前記吸
込ケーシングの下端３０と前記オリフィスの端部１とを
間隙ｉを隔てて設け、前記吸込ケーシング２７とオリフ
ィス３との間に複数の仕切板を前記オリフィス３の外周
部１０から間隙ｊを隔てて設置し、このオリフィス３の
下面にグリル２８を備えたものである。As shown in the drawing, an orifice 3 having a suction hole 2 equal to or smaller than the suction port 26 and a suction casing 27 having a suction port 26 is provided with a lower end 30 of the suction casing and an end portion of the orifice. 1 are provided with a gap i therebetween, and a plurality of partition plates are installed between the suction casing 27 and the orifice 3 with a gap j from the outer peripheral portion 10 of the orifice 3, and a grill 28 is provided on the lower surface of the orifice 3. It is equipped with.
【００３７】上記構成において、羽根車２３が回転する
と、吸込空気はグリル２８からオリフィス３の吸込孔２
を通り、前記吸込ケーシング２７の吸込口２６より羽根
車２３に入り羽根車２３により昇圧され、渦巻ケーシン
グ２５の内部ｄを通り吐出口２９より吐出される。この
とき前記羽根車２３で昇圧されるときに発生する回転騒
音や、渦巻ケーシング２５を通るときに発生する渦によ
る乱流騒音や、渦巻ケーシング２５内で発生した音が容
積の中で増幅される複数の周波数を持つ共鳴騒音が前記
吸込口２６から吸込側空間ｃへ放射されるが、オリフィ
ス３及び複数の仕切板９が有るため一部の騒音は遮音お
よび消音され吸込側空間ｃへは放射されない。なお、複
数の仕切板９をベルマウス形状としてもよい。また、仕
切板９を移動できるようにし周波数の変化に対応するこ
ともできることは言うまでもない。In the above structure, when the impeller 23 rotates, the suction air is drawn from the grill 28 into the suction hole 2 of the orifice 3.
Through the suction port 26 of the suction casing 27 to enter the impeller 23, the pressure of which is increased by the impeller 23 and the discharge from the discharge port 29 through the inside d of the spiral casing 25. At this time, the rotational noise generated when the pressure is increased by the impeller 23, the turbulent noise due to the vortex generated when passing through the spiral casing 25, and the sound generated inside the spiral casing 25 are amplified in the volume. Resonant noise having a plurality of frequencies is radiated from the suction port 26 to the suction side space c, but since the orifice 3 and the plurality of partition plates 9 are present, a part of the noise is sound-insulated and silenced and radiated to the suction side space c. Not done. The plurality of partition plates 9 may have a bell mouth shape. Further, it goes without saying that the partition plate 9 can be moved so as to cope with a change in frequency.
【００３８】つぎに本発明の第４実施例について図５を
参照しながら説明する。なお第１実施例と同一箇所には
同一番号を付けて詳細な説明は省略する。Next, a fourth embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.
【００３９】図に示すように、吸込口２６を有する吸込
ケーシング２７と間隙ｈを隔て前記吸込口２６より同等
あるいは小さな吸込孔２を有するオリフィス３を前記吸
込ケーシング２７の下端３０と前記オリフィス３の端部
１とを間隙ｉを隔てて設け、この間隙ｉの部分に通気性
のない薄いフィルム１１を取付けて、このオリフィス３
の下面にグリル２８を備えたものである。As shown in the drawing, an orifice 3 having a suction hole 2 that is equal to or smaller than the suction port 26 and a suction casing 27 having a suction port 26 is provided with a lower end 30 of the suction casing 27 and the orifice 3. The end portion 1 is provided with a gap i therebetween, and a thin film 11 having no air permeability is attached to the portion of the gap i, and the orifice 3
The grill 28 is provided on the lower surface of the.
【００４０】上記構成において、羽根車２３が回転する
と、吸込空気はグリル２８からオリフィス３の吸込孔２
を通り、前記吸込ケーシング２７の吸込口２６より羽根
車２３に入り羽根車２３により昇圧され、渦巻ケーシン
グ２５の内部ｄを通り吐出口２９より吐出される。この
とき前記羽根車２３で昇圧されるときに発生する回転騒
音や、渦巻ケーシング２５を通るときに発生する渦によ
る乱流騒音や、渦巻ケーシング２５内で発生した音が容
積の中で増幅される共鳴騒音が前記吸込口２６から吸込
側空間ｃへ放射されるが、オリフィス３が有るため一部
の騒音は遮音および消音され吸込側空間ｃへは放射され
ない。また、吸込ケーシング２７とオリフィス３との間
に起こる乱れをフィルム１１により防止することができ
る。In the above-mentioned structure, when the impeller 23 rotates, the suction air flows from the grill 28 to the suction hole 2 of the orifice 3.
Through the suction port 26 of the suction casing 27 to enter the impeller 23, the pressure of which is increased by the impeller 23 and the discharge from the discharge port 29 through the inside d of the spiral casing 25. At this time, the rotational noise generated when the pressure is increased by the impeller 23, the turbulent noise due to the vortex generated when passing through the spiral casing 25, and the sound generated inside the spiral casing 25 are amplified in the volume. Resonance noise is radiated from the suction port 26 to the suction side space c, but because of the presence of the orifice 3, some noise is insulated and muted, and is not radiated to the suction side space c. Further, the film 11 can prevent the disturbance generated between the suction casing 27 and the orifice 3.
【００４１】つぎに本発明の第５実施例について図６を
参照しながら説明する。なお第１実施例と同一箇所には
同一番号を付けて詳細な説明は省略する。Next, a fifth embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.
【００４２】図に示すように、吸込口２６を有する吸込
ケーシング２７と間隙ｈを隔て前記吸込口２６より同等
あるいは小さな吸込孔２を有し、材質を多孔質の焼結材
とするオリフィス１２を前記吸込ケーシングの下端３０
と前記オリフィス１２の端部１とを間隙ｉを隔てて設
け、このオリフィス１２の下面にグリル２８を備えたも
のである。As shown in the figure, an orifice 12 having a suction casing 27 having a suction port 26 and a suction hole 2 which is equal to or smaller than the suction port 26 and is made of a porous sintered material is formed at a gap h. Lower end 30 of the suction casing
And the end 1 of the orifice 12 are provided with a gap i therebetween, and a grill 28 is provided on the lower surface of the orifice 12.
【００４３】上記構成において、羽根車２３が回転する
と、吸込空気はグリル２８からオリフィス３の吸込孔２
を通り、前記吸込ケーシング２７の吸込口２６より羽根
車２３に入り羽根車２３により昇圧され、渦巻ケーシン
グ２５の内部ｄを通り吐出口２９より吐出される。この
とき前記羽根車２３で昇圧されるときに発生する回転騒
音や、渦巻ケーシング２５を通るときに発生する渦によ
る乱流騒音や、渦巻ケーシング２５内で発生した音が容
積の中で増幅される共鳴騒音が前記吸込口２６から吸込
側空間ｃへ放射されるが、多孔質の焼結材であるオリフ
ィス１２が有るため一部の騒音は遮音および消音及び吸
音の相乗効果を得て、吸込側空間ｃへは放射されない。In the above structure, when the impeller 23 rotates, the suction air is drawn from the grill 28 into the suction hole 2 of the orifice 3.
Through the suction port 26 of the suction casing 27 to enter the impeller 23, the pressure of which is increased by the impeller 23 and the discharge from the discharge port 29 through the inside d of the spiral casing 25. At this time, the rotational noise generated when the pressure is increased by the impeller 23, the turbulent noise due to the vortex generated when passing through the spiral casing 25, and the sound generated inside the spiral casing 25 are amplified in the volume. Resonance noise is radiated from the suction port 26 to the suction side space c, but since there is the orifice 12 which is a porous sintered material, a part of the noise obtains a synergistic effect of sound insulation, sound deadening and sound absorption, and the suction side. It is not radiated to the space c.
【００４４】つぎに本発明の第６実施例について図７を
参照しながら説明する。なお第１実施例と同一箇所には
同一番号を付けて詳細な説明は省略する。Next, a sixth embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.
【００４５】図に示すように、吸込口２６を有する吸込
ケーシング２７と間隙ｈを隔て前記吸込口２６より同等
あるいは小さな吸込孔２を有するオリフィス３を前記吸
込ケーシングの下端３０と前記オリフィスの端部１とを
間隙ｉを隔てて設け、前記オリフィス３の吸込孔２の一
部あるいは全体に繊維材１３を植毛し、このオリフィス
３の下面にグリル２８を備えたものである。As shown in the figure, an orifice 3 having a suction hole 2 which is equal to or smaller than the suction port 26 and a suction casing 27 having a suction port 26 is provided with a lower end 30 of the suction casing and an end portion of the orifice. 1 is provided with a gap i therebetween, and the fiber material 13 is planted in a part or the whole of the suction hole 2 of the orifice 3, and a grill 28 is provided on the lower surface of the orifice 3.
【００４６】上記構成において、羽根車２３が回転する
と、吸込空気はグリル２８からオリフィス３の吸込孔２
を通り、前記吸込ケーシング２７の吸込口２６より羽根
車２３に入り羽根車２３により昇圧され、渦巻ケーシン
グ２５の内部ｄを通り吐出口２９より吐出される。この
とき前記羽根車２３で昇圧されるときに発生する回転騒
音や、渦巻ケーシング２５を通るときに発生する渦によ
る乱流騒音や、渦巻ケーシング２５内で発生した音が容
積の中で増幅される共鳴騒音が前記吸込口２６から吸込
側空間ｃへ放射されるが、オリフィス３が有るため一部
の騒音は遮音および消音され吸込側空間ｃへは放射され
ない。また、オリフィス３での圧力損失による剥離減少
を繊維材１３において防止する。In the above structure, when the impeller 23 rotates, the suction air is drawn from the grill 28 into the suction hole 2 of the orifice 3.
Through the suction port 26 of the suction casing 27 to enter the impeller 23, the pressure of which is increased by the impeller 23 and the discharge from the discharge port 29 through the inside d of the spiral casing 25. At this time, the rotational noise generated when the pressure is increased by the impeller 23, the turbulent noise due to the vortex generated when passing through the spiral casing 25, and the sound generated inside the spiral casing 25 are amplified in the volume. Resonance noise is radiated from the suction port 26 to the suction side space c, but because of the presence of the orifice 3, some noise is insulated and muted, and is not radiated to the suction side space c. Further, the fibrous material 13 is prevented from reducing separation due to pressure loss at the orifice 3.
【００４７】つぎに本発明の第７実施例について図８を
参照しながら説明する。なお第１実施例と同一箇所には
同一番号を付けて詳細な説明は省略する。Next, a seventh embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.
【００４８】図に示すように、吸込口２６を有する吸込
ケーシング２７と間隙ｈを隔て前記吸込口２６より同等
あるいは小さな吸込孔２を有するオリフィス３を前記吸
込ケーシングの下端３０と前記オリフィスの端部１とを
間隙ｉを隔てて設け、前記吸込ケーシングと前記オリフ
ィスとの間に通風部を有した吸音材１４を設置し、前記
オリフィス３の下面にグリル２８を備えたものである。As shown in the drawing, an orifice 3 having a suction hole 2 which is equal to or smaller than the suction port 26 and a suction casing 27 having a suction port 26 is provided with a lower end 30 of the suction casing and an end portion of the orifice. 1 is provided with a gap i therebetween, a sound absorbing material 14 having a ventilation portion is installed between the suction casing and the orifice, and a grill 28 is provided on the lower surface of the orifice 3.
【００４９】上記構成において、羽根車２３が回転する
と、吸込空気はグリル２８からオリフィス３の吸込孔２
を通り、前記吸込ケーシング２７の吸込口２６より羽根
車２３に入り羽根車２３により昇圧され、渦巻ケーシン
グ２５の内部ｄを通り吐出口２９より吐出される。この
とき前記羽根車２３で昇圧されるときに発生する回転騒
音や、渦巻ケーシング２５を通るときに発生する渦によ
る乱流騒音や、渦巻ケーシング２５内で発生した音が容
積の中で増幅される共鳴騒音が前記吸込口２６から吸込
側空間ｃへ放射されるが、オリフィス３が有るため一部
の騒音は遮音および消音および吸音され吸込側空間ｃへ
は放射されない。In the above structure, when the impeller 23 rotates, the suction air is drawn from the grill 28 into the suction hole 2 of the orifice 3.
Through the suction port 26 of the suction casing 27 to enter the impeller 23, the pressure of which is increased by the impeller 23 and the discharge from the discharge port 29 through the inside d of the spiral casing 25. At this time, the rotational noise generated when the pressure is increased by the impeller 23, the turbulent noise due to the vortex generated when passing through the spiral casing 25, and the sound generated inside the spiral casing 25 are amplified in the volume. Resonance noise is radiated from the suction port 26 to the suction side space c, but since the orifice 3 is provided, part of the noise is sound-insulated, muted and absorbed, and is not radiated to the suction side space c.
【００５０】[0050]
【発明の効果】以上の実施例の説明より明らかなよう
に、本発明によれば、遮音効果と共鳴騒音防止効果と吸
音効果の相乗効果により製品外部への騒音放射を極めて
低くすることができる天井埋込形換気扇を提供できる。As is apparent from the above description of the embodiments, according to the present invention, the noise radiation to the outside of the product can be extremely reduced by the synergistic effect of the sound insulation effect, the resonance noise prevention effect and the sound absorption effect. We can provide ceiling-mounted ventilation fans.
【図１】本発明の第１実施例の天井埋込形換気扇の側断
面図FIG. 1 is a side sectional view of a ceiling-embedded ventilation fan according to a first embodiment of the present invention.
【図２】同正面図FIG. 2 is a front view of the same.
【図３】同第２実施例の同側断面図FIG. 3 is a sectional side view of the same second embodiment.
【図４】同第３実施例の同側断面図FIG. 4 is a sectional side view of the same third embodiment.
【図５】同第４実施例の同側断面図FIG. 5 is a side cross-sectional view of the same fourth embodiment.
【図６】同第５実施例の同側断面図FIG. 6 is a side sectional view of the same fifth embodiment.
【図７】同第６実施例の同側断面図FIG. 7 is a same side sectional view of the sixth embodiment.
【図８】同第７実施例の同側断面図FIG. 8 is a sectional side view of the same seventh embodiment.
【図９】従来の天井埋込形換気扇の側断面図FIG. 9 is a side sectional view of a conventional ceiling-embedded ventilation fan.
【図１０】同正面図FIG. 10 is a front view of the same.
【図１１】本発明の天井埋込形換気扇と従来の天井埋込
形換気扇の騒音特性比較図FIG. 11 is a noise characteristic comparison diagram of the ceiling-embedded ventilation fan of the present invention and the conventional ceiling-embedded ventilation fan.
１ 端部 ２ 吸込孔 ３ オリフィス ４ 吸込孔 ５ オリフィス ６ ガイド ７ 上端 ８ 下端 ９ 仕切板 １０ 外周部 １１ オリフィス １２ フィルム １３ 繊維材 １４ 吸音材 １５ 本発明品の騒音特性値 １６ 従来品の騒音特性値 ２１ 本体 ２２ 天面 ２３ 羽根車 ２４ 電動機 ２５ 渦巻ケーシング ２６ 吸込口 ２７ 吸込ケーシング ２８ グリル ２９ 吐出口 ３０ 下端 1 End 2 Suction hole 3 Orifice 4 Suction hole 5 Orifice 6 Guide 7 Upper end 8 Lower end 9 Partition plate 10 Outer periphery 11 Orifice 12 Film 13 Fiber material 14 Sound absorbing material 15 Noise characteristic value of the present invention 16 Noise characteristic value of the conventional product 21 Main Body 22 Top Surface 23 Impeller 24 Electric Motor 25 Swirl Casing 26 Suction Port 27 Suction Casing 28 Grill 29 Discharge Port 30 Lower End
Claims (7)
面に羽根車を固着した電動機を設け、前記羽根車の周囲
を囲む渦巻ケーシングと、ベルマウス状の吸込口を有す
る吸込ケーシングと吐出口とを備え、前記吸込ケーシン
グと間隙ｈを隔て前記吸込ケーシングの吸込口と同等あ
るいは小さな吸込孔を有するオリフィスを前記吸込ケー
シングの下端と前記オリフィスの端部とを間隙ｉを隔て
て設け、このオリフィスより下面の前記本体の下面開口
部にグリルを設けた天井埋込形換気扇。1. A main body having a lower surface opened, a motor having an impeller fixed to a top surface of the main body, a spiral casing surrounding the impeller, and a suction casing having a bellmouth-shaped suction port. An orifice having a discharge port and having a suction hole equal to or smaller than the suction port of the suction casing with a gap h from the suction casing, the lower end of the suction casing and the end of the orifice are provided with a gap i. A ceiling-embedded ventilation fan in which a grill is provided in the lower surface opening of the main body below the orifice.
面に羽根車を固着した電動機を設け、前記羽根車の周囲
を囲む渦巻ケーシングと、ベルマウス状の吸込口を有す
る吸込ケーシングと吐出口を備え、前記吸込ケーシング
の吸込口より同等あるいは小さな吸込孔を有するオリフ
ィスに内接または外接する可動可能なリング状のガイド
を設け、このガイドの上端と前記吸込ケーシングの下端
との間隙ｉを隔てて、前記吸込ケーシングと前記オリフ
ィスの間隙ｈを変化できるように配置し、このオリフィ
スより下面の前記本体の下面開口部にグリルを設けた天
井埋込形換気扇。2. A main body having a lower surface opened, a motor having an impeller fixed to the top surface of the main body, a spiral casing surrounding the impeller, and a suction casing having a bellmouth-shaped suction port. A movable ring-shaped guide which is inscribed or circumscribed in an orifice having a discharge port and having a suction hole equal to or smaller than the suction port of the suction casing is provided, and a gap i between the upper end of the guide and the lower end of the suction casing i. A ceiling-embedded ventilation fan in which a gap h between the suction casing and the orifice can be changed, and a grill is provided in the lower surface opening of the main body below the orifice.
の間に複数枚の仕切板をオリフィスの外周部と間隙ｊを
隔てて設けた請求項１記載の天井埋込形換気扇。3. A gap h between the suction casing and the orifice.
The ceiling-embedded ventilation fan according to claim 1, wherein a plurality of partition plates are provided between the outer peripheral portion of the orifice and a gap j.
記載の天井埋込形換気扇。4. A film material is attached to the gap i.
Ceiling embedded ventilation fan described.
した請求項１記載の天井埋込形換気扇。5. The ceiling-embedded ventilation fan according to claim 1, wherein a porous sintered material is used for the orifice portion.
た請求項１記載の天井埋込形換気扇。6. The ceiling-embedded ventilation fan according to claim 1, wherein fine fiber material is planted in the orifice portion.
通風部を有した吸音材を充填した請求項１記載の天井埋
込形換気扇。7. The ceiling-embedded ventilation fan according to claim 1, wherein a sound absorbing material having a ventilation portion is filled in a gap between the suction casing and the orifice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22657194A JP3279834B2 (en) | 1994-09-21 | 1994-09-21 | Recessed ceiling ventilation fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22657194A JP3279834B2 (en) | 1994-09-21 | 1994-09-21 | Recessed ceiling ventilation fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0894146A true JPH0894146A (en) | 1996-04-12 |
| JP3279834B2 JP3279834B2 (en) | 2002-04-30 |
Family
ID=16847258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22657194A Expired - Fee Related JP3279834B2 (en) | 1994-09-21 | 1994-09-21 | Recessed ceiling ventilation fan |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3279834B2 (en) |
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