JP2009287452A - Axial flow blower - Google Patents

Axial flow blower Download PDF

Info

Publication number
JP2009287452A
JP2009287452A JP2008140360A JP2008140360A JP2009287452A JP 2009287452 A JP2009287452 A JP 2009287452A JP 2008140360 A JP2008140360 A JP 2008140360A JP 2008140360 A JP2008140360 A JP 2008140360A JP 2009287452 A JP2009287452 A JP 2009287452A
Authority
JP
Japan
Prior art keywords
absorbing material
sound absorbing
peripheral side
cylinder
axial
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.)
Pending
Application number
JP2008140360A
Other languages
Japanese (ja)
Inventor
Atsufumi Ichihashi
篤文 市橋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Original Assignee
Panasonic Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Panasonic Corp filed Critical Panasonic Corp
Priority to JP2008140360A priority Critical patent/JP2009287452A/en
Publication of JP2009287452A publication Critical patent/JP2009287452A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F04D29/664—Sound attenuation by means of sound absorbing material

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axial flow blower for lowering a noise value and reducing cost. <P>SOLUTION: A cylindrical casing of the axial flow blower 1 is structured by an air-feeding cylinder 4 provided with a motor 2 and an impeller 3 and muffling cylinders 5 provided for both front and rear side in a central axis direction of the air-feeding cylinder 4. The muffling cylinder 5 is structured by an inner cylinder 7 composed of a punching metal and an outer cylinder at an outer circumferential side of the same. A sound absorbing material insertion part is provided between the inner cylinder 7 and the outer cylinder 8 and two board type sound absorbing materials 1A, 1B are overlapped and inserted to an inner circumferential side and the outer circumferential side in the sound absorbing material insertion part. Density of the sound absorbing material 1A of the inner circumferential side is lower than that of the sound absorbing material 1B of the outer circumferential side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、自動車道路トンネルの天井に設置され、噴流による圧力上昇によりトンネル内を換気する軸流送風機に関する。   The present invention relates to an axial blower that is installed on a ceiling of an automobile road tunnel and ventilates the inside of the tunnel by a pressure increase caused by a jet.

従来の軸流送風機の構成を図１６に示す。   The configuration of a conventional axial fan is shown in FIG.

図１６に示す軸流送風機は、筒型ケーシング１０１内にモータ１０２が内装され、このモータ１０２の軸に羽根車１０３が取り付けられている。一方、モータ１０２前後には、固定ハブコーン１０４が、支持板１０５を介して筒型ケーシング１０１に取り付けられている。モータ１０２は、両軸モータを用いたもので、それぞれの軸に羽根車１０３が取り付けられて２段構成の羽根車となっている。筒型ケーシング１０１は、内筒１０１ａとその周囲に設けられた外筒１０１ｂで構成されている。内筒１０１ａと外筒１０１ｂとの間の空間は、吸音材挿入部１０６として、吸音材（グラスウール）が充填されており、吸音効果を持たせている。（特許文献１）。また、固定ハブコーン１０４の内部にも吸音材が充填されており、吸音効果を持たせている。
特許第２９９７２５７号公報 In the axial blower shown in FIG. 16, a motor 102 is housed in a cylindrical casing 101, and an impeller 103 is attached to the shaft of the motor 102. On the other hand, a fixed hub cone 104 is attached to the cylindrical casing 101 via a support plate 105 around the motor 102. The motor 102 uses a biaxial motor, and an impeller 103 is attached to each shaft to form a two-stage impeller. The cylindrical casing 101 includes an inner cylinder 101a and an outer cylinder 101b provided around the inner cylinder 101a. The space between the inner cylinder 101a and the outer cylinder 101b is filled with a sound absorbing material (glass wool) as the sound absorbing material insertion portion 106, and has a sound absorbing effect. (Patent Document 1). Further, the inside of the fixed hub cone 104 is also filled with a sound absorbing material, and has a sound absorbing effect.
Japanese Patent No. 2997257

このような軸流送風機は、従来より騒音が大きいことが問題である。また、最近の市場の動向として設置台数削減などの目的から、軸流送風機の高風速化が望まれており、ますます騒音の増加につながるという課題を有している。   Such an axial blower has a problem that the noise is higher than that of the conventional fan. Further, as a recent market trend, for the purpose of reducing the number of installed units, an increase in the wind speed of an axial blower is desired, and there is a problem of increasing noise.

本発明は、上記課題を解決し、騒音値の低減化を図った軸流送風機を提供することを目的とする。   An object of the present invention is to provide an axial blower that solves the above-described problems and reduces the noise level.

上記課題を解決するために、本発明の第１の手段は、筒型ケーシング内に、モータと、このモータの回転軸に装着した羽根車とを備えた軸流送風機において、前記筒型ケーシングは、内筒とその周囲に設けた外筒とで構成され、内筒と外筒の間を吸音材挿入部とし、この吸音材挿入部にボードタイプの吸音材を内周側と外周側に２枚重ねて挿入することを特徴とするものである。   In order to solve the above-mentioned problem, the first means of the present invention is an axial blower comprising a cylindrical casing and a motor, and an impeller mounted on the rotating shaft of the motor. It is composed of an inner cylinder and an outer cylinder provided around the inner cylinder, and a sound absorbing material insertion portion is provided between the inner cylinder and the outer cylinder. It is characterized by being inserted in layers.

また、他の手段は、内周側に設けた吸音材は、外周側に設けた吸音材よりも密度を小さくすることを特徴とするものである。   Another means is that the sound absorbing material provided on the inner peripheral side has a lower density than the sound absorbing material provided on the outer peripheral side.

このような構成により、高い消音効果が得られる。   With such a configuration, a high silencing effect can be obtained.

本発明の軸流送風機は、内周側に高い密度の吸音材を設け、外周側に低い密度の吸音材を設けることにより、騒音値の低減化を図ることができる。   The axial blower of the present invention can reduce the noise value by providing a high density sound absorbing material on the inner peripheral side and providing a low density sound absorbing material on the outer peripheral side.

以下、本発明の実施の形態について、図面を用いて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（実施の形態１）
図１に示すように、本実施の形態の軸流送風機は、モータ２と羽根車３を備えた送風筒４の中心軸方向の前後両側に、ほぼ同径の消音筒５が設けられている。これらの送風筒４と消音筒５とで、軸流送風機１の筒型ケーシングとしている。消音筒５は、図２に示すように、内側に固定ハブコーン６を有し、この固定ハブコーン６を中心とした円周上にパンチングメタルによって内筒７を設けられ、さらにその外周側には外筒８が設けられている。外筒８は、カバー８Ａを外周側に取り付けることによって構成されている。また、内筒７と外筒８との間には吸音材挿入部がある。この吸音材挿入部には、内周側と外周側とに２枚のボードタイプの吸音材１Ａ、１Ｂを重ねて挿入している。吸音材１Ａ、１Ｂは、図３に示すように設けられ、内周側の吸音材１Ａは、外周側の吸音材１Ｂよりも密度の大きいものとしている。 (Embodiment 1)
As shown in FIG. 1, the axial blower of the present embodiment is provided with silencer cylinders 5 having substantially the same diameter on both front and rear sides in the central axis direction of a blower cylinder 4 provided with a motor 2 and an impeller 3. . The blower cylinder 4 and the silencer cylinder 5 constitute a cylindrical casing of the axial blower 1. As shown in FIG. 2, the silencer cylinder 5 has a fixed hub cone 6 on the inner side, and an inner cylinder 7 is provided on the circumference around the fixed hub cone 6 by punching metal. A cylinder 8 is provided. The outer cylinder 8 is configured by attaching a cover 8A to the outer peripheral side. Further, there is a sound absorbing material insertion portion between the inner cylinder 7 and the outer cylinder 8. In this sound absorbing material insertion portion, two board-type sound absorbing materials 1A and 1B are overlapped and inserted on the inner peripheral side and the outer peripheral side. The sound absorbing materials 1A and 1B are provided as shown in FIG. 3, and the inner sound absorbing material 1A has a higher density than the outer sound absorbing material 1B.

（実施の形態２）
第２の実施の形態について、図４、図５を用いて説明する。第１の実施の形態と同様の構成については同じ符号を付し、詳細な説明を省略する。 (Embodiment 2)
A second embodiment will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

第２の実施の形態の消音筒５は、吸音材挿入部には、内周側に吸音材１Ａを挿入し、吸音材１Ａと外筒８との間に空間、すなわち空気層を設けた構成である。この空気層を背面空気層と呼ぶ。   The silencer cylinder 5 of the second embodiment has a configuration in which the sound absorbing material 1A is inserted into the sound absorbing material insertion portion on the inner peripheral side, and a space, that is, an air layer is provided between the sound absorbing material 1A and the outer cylinder 8. It is. This air layer is called a back air layer.

また、図５（ａ）に示すように、外筒８を構成するカバー８Ｂは、その内周側となる面に、針状の吸音材の支持棒９が内周側に向けて立てて溶接されている。このカバー８Ｂをはめて外筒８を構成する際、吸音材の支持棒９は、内周側に設けた吸音材１Ａを外側から押さえつけるようになる。従って吸音材１Ａとカバー８Ｂ（外筒８）との間には空気層、すなわち、背面空気層が形成されることになる。この吸音材１Ａを押さえつける方法としては、図５（ｂ）に示すように、支持板１０を内側に向けて立設してもよい。この支持板１０には、開口を設けることによって背面空気層に到達した音がこの層内を行き来して、最終的に消音されることになる。   Further, as shown in FIG. 5 (a), the cover 8B constituting the outer cylinder 8 is welded with a support rod 9 of a needle-like sound absorbing material standing on the inner peripheral side on the inner peripheral side. Has been. When the cover 8B is fitted to configure the outer cylinder 8, the sound absorbing material support rod 9 presses the sound absorbing material 1A provided on the inner peripheral side from the outside. Therefore, an air layer, that is, a back air layer is formed between the sound absorbing material 1A and the cover 8B (outer cylinder 8). As a method of pressing down the sound absorbing material 1A, as shown in FIG. 5B, the support plate 10 may be erected inward. By providing an opening in the support plate 10, the sound that has reached the back air layer moves back and forth within this layer and is finally silenced.

また、図６に示すように、吸音材挿入部には、内周側に吸音材１Ａを挿入し、外周側には、穴のあいた吸音材１Ｃを設けてもよい。この穴の部分が背面空気層を形成することとなる。   Further, as shown in FIG. 6, the sound absorbing material insertion portion may be provided with a sound absorbing material 1A on the inner peripheral side and a sound absorbing material 1C with a hole on the outer peripheral side. This hole portion forms a back air layer.

また、図７に示すように、一方の面にあらかじめくりぬいた穴を設けた１枚の吸音材１Ｄを用いてもよい。この吸音材１Ｄは、くりぬいた穴を設けた面を外周側にして吸音材挿入部に挿入する。このくりぬいた穴が背面空気層を形成するものである。   Moreover, as shown in FIG. 7, you may use 1 sound absorption material 1D which provided the hole hollowed beforehand in one surface. This sound absorbing material 1D is inserted into the sound absorbing material insertion portion with the surface provided with the hollowed hole as the outer peripheral side. This hollowed hole forms a back air layer.

（実施の形態３）
第３の実施の形態について、図８を用いて説明する。第１、第２の実施の形態と同様の構成については同じ符号を付し、詳細な説明を省略する。 (Embodiment 3)
A third embodiment will be described with reference to FIG. The same components as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

第３の実施の形態の消音筒５は、図８に示すように固定ハブコーン６は、筒状の外殻の内部に吸音材挿入部を設け、この吸音材挿入部の外側にボードタイプの吸音材１Ｅを張り、中心部を空洞としたものである。   As shown in FIG. 8, in the silencer cylinder 5 of the third embodiment, the fixed hub cone 6 is provided with a sound absorbing material insertion portion inside a cylindrical outer shell, and a board type sound absorption outside the sound absorbing material insertion portion. The material 1E is stretched and the center is hollow.

以下、本発明の実施例について説明する。   Examples of the present invention will be described below.

（実施例１）
以下、本発明の実施例を示す。グラスウールは連続空気室をもつ多孔質材料である。グラスウールに入射した音のエネルギーはグラスウール内部に伝搬して、ガラス繊維や空気を振動させ熱エネルギーに変わる。これによりグラスウールは低音域から高音域まで幅広い音に対して優れた吸音性を発揮する。本発明の軸流送風機の場合、モータおよび羽根から発せられた音は吸音材挿入部に挿入されている吸音材（グラスウール）に入射し、ガラス繊維や空気を振動させ、熱エネルギーに変わる。つまり音のエネルギーが小さくなり、吸音されたことを意味する。また、グラスウールの吸音特性に対して最も重要なのは、材料の厚さと背後空気層の条件である（「騒音・振動対策ハンドブック」 社団法人日本音響材料協会 Ｐ６０８）。 Example 1
Examples of the present invention will be described below. Glass wool is a porous material with a continuous air chamber. The energy of the sound incident on the glass wool propagates inside the glass wool and vibrates the glass fiber and air to change into thermal energy. As a result, glass wool exhibits excellent sound absorption for a wide range of sounds from low to high frequencies. In the case of the axial blower of the present invention, the sound emitted from the motor and the blades enters the sound absorbing material (glass wool) inserted in the sound absorbing material insertion portion, vibrates glass fiber and air, and changes to heat energy. In other words, it means that the sound energy is reduced and the sound is absorbed. The most important factor for the sound absorption characteristics of glass wool is the thickness of the material and the conditions of the back air layer ("Noise / Vibration Countermeasure Handbook" Japan Acoustics Association P608).

吸音材（グラスウール）の挿入パターンをいくつか変えた実験系を用意し、騒音測定を行った。用意した実験系は図１１に示すようにパターン１〜パターン５である。   An experimental system was prepared in which some insertion patterns of the sound absorbing material (glass wool) were changed, and the noise was measured. The prepared experimental system is pattern 1 to pattern 5 as shown in FIG.

まずパターン１は、内側に密度２４ｋｇ／ｍ3の吸音材（厚み５０ｍｍ）を挿入し、外側にも同様の密度２４ｋｇ／ｍ3の吸音材（厚み５０ｍｍ）を挿入した。 First pattern 1, sound absorbing material of density 24 kg / m 3 (thickness 50 mm) was inserted into the inside, it was inserted sound absorbing material of similar density 24 kg / m 3 on the outside (thickness 50 mm).

次にパターン２は、内側に密度２４ｋｇ／ｍ3の吸音材（厚み５０ｍｍ）を挿入し、外側に密度３２ｋｇ／ｍ3の吸音材（厚み５０ｍｍ）を挿入した。つまり、内側の吸音材は密度の小さいもの、外側の吸音材は密度の大きいものである。 Next, in pattern 2, a sound absorbing material having a density of 24 kg / m 3 (thickness 50 mm) was inserted inside, and a sound absorbing material having a density of 32 kg / m 3 (thickness 50 mm) was inserted outside. That is, the inner sound absorbing material has a low density, and the outer sound absorbing material has a high density.

パターン３は、内側に密度３２ｋｇ／ｍ3の吸音材（厚み５０ｍｍ）を挿入し、外側に密度２４ｋｇ／ｍ3の吸音材（厚み５０ｍｍ）を挿入した。つまり、内側の吸音材は密度の大きいもの、外側の吸音材は密度の小さいものである。 In pattern 3, a sound absorbing material with a density of 32 kg / m 3 (thickness 50 mm) was inserted inside, and a sound absorbing material with a density of 24 kg / m 3 (thickness 50 mm) was inserted outside. That is, the inner sound absorbing material has a high density, and the outer sound absorbing material has a low density.

パターン４は、内側に密度２４ｋｇ／ｍ3の吸音材（厚み５０ｍｍ）を挿入し、外側には何も挿入しない。つまり、背面空気層を設けたものである。 In pattern 4, a sound absorbing material (thickness 50 mm) having a density of 24 kg / m 3 is inserted inside, and nothing is inserted outside. That is, a back air layer is provided.

パターン５は内側に密度３２ｋｇ／ｍ3の吸音材（厚み５０ｍｍ）を挿入し、外側には何も挿入しない。つまり、背面空気層を設けたものである。 In pattern 5, a sound absorbing material (thickness 50 mm) having a density of 32 kg / m 3 is inserted inside, and nothing is inserted outside. That is, a back air layer is provided.

図１２に今回の実験での騒音測定位置を示す。吸込み口より１．５ｍ後方の位置Ａ、吸込み側斜め４５°１．５ｍの位置Ｂ、真横１．５ｍの位置Ｃ、吐出側斜め４５°１．５ｍの位置Ｄにおいて測定を行った。   FIG. 12 shows the noise measurement position in this experiment. Measurements were made at a position A 1.5 m behind the suction port, a position B at 45 ° 1.5 m diagonally on the suction side, a position C 1.5 m right side, and a position D 45 ° 1.5 m diagonal on the discharge side.

図１３に位置Ａにて測定した騒音の周波数測定の結果を、図１４に位置Ｃにて測定した騒音の周波数測定の結果を示す。図１５には、各測定位置（位置Ａ、Ｂ、Ｃ、Ｄ）での騒音測定値の結果を示す。これによると、基準としたパターン２４−２４（内周側２４ｋｇ／ｍ3、外周側２４ｋｇ／ｍ3）に対してパターン２４−３２（内周側２４ｋｇ／ｍ3、外周側３２ｋｇ／ｍ3）の方が騒音低減効果があり、このパターンはパターン３２−２４（内周側３２ｋｇ／ｍ3、外周側２４ｋｇ／ｍ3）よりも効果が高い。さらに外周側に空気層を設けたパターン２４−空（内周側２４ｋｇ／ｍ3、外周側空気層）やパターン３２−空（内周側３２ｋｇ／ｍ3、外周側空気層）は基準としたパターン２４−２４（内周側２４ｋｇ／ｍ3、外周側２４ｋｇ／ｍ3）に対して同等かそれ以下の騒音低減効果があり、材料費の低減から見ても効果があると言える。 FIG. 13 shows the result of noise frequency measurement measured at position A, and FIG. 14 shows the result of noise frequency measurement measured at position C. In FIG. 15, the result of the noise measurement value in each measurement position (position A, B, C, D) is shown. According to this, reference pattern 24-24 (inner circumferential side 24 kg / m 3, the outer peripheral side 24 kg / m 3) for the pattern 24-32 (inner circumferential side 24 kg / m 3, the outer peripheral side 32 kg / m 3) This has a noise reduction effect, and this pattern is more effective than the pattern 32-24 (inner peripheral side 32 kg / m 3 , outer peripheral side 24 kg / m 3 ). Furthermore, the pattern 24-empty (inner peripheral side 24 kg / m 3 , outer peripheral air layer) and the pattern 32-empty (inner peripheral side 32 kg / m 3 , outer air layer) provided with an air layer on the outer peripheral side were used as references. There is a noise reduction effect equivalent to or lower than that of the pattern 24-24 (inner circumference side 24kg / m 3 , outer circumference side 24kg / m 3 ), and it can be said that it is also effective in view of reduction of material cost.

本発明は、正転時と逆転時に同等の性能を必要とする送風機、ポンプなどに用いることが可能である。   The present invention can be used for a blower, a pump, or the like that requires equivalent performance during forward rotation and reverse rotation.

本発明の第１の実施の形態の軸流送風機の断面図Sectional drawing of the axial-flow fan of the 1st Embodiment of this invention 同軸流送風機の消音筒部分の説明図Explanatory drawing of the silencer part of the coaxial fan 同内周側と外周側に吸音材を装着した状態を示す図The figure which shows the state which attached the sound-absorbing material to the inner circumference side and the outer circumference side 第２の実施の形態の軸流送風機の消音筒外周側に空気層を設けた吸音材装着状態を示す図The figure which shows the sound absorption material mounting | wearing state which provided the air layer in the silencer cylinder outer peripheral side of the axial flow fan of 2nd Embodiment. （ａ）同吸音材支持棒を用いた吸音材装着状態を示す図、（ｂ）同吸音材支持板を用いた吸音材装着状態を示す図(A) The figure which shows the sound-absorbing material mounting state using the sound-absorbing material support rod, (b) The figure which shows the sound-absorbing material mounting state using the sound-absorbing material support plate 同外周側の吸音材に穴を開けた吸音材装着状態を示す図The figure which shows the sound-absorbing material attachment state which opened the hole in the sound-absorbing material of the outer periphery side 同外周側をくりぬいた吸音材装着状態を示す図The figure which shows the sound-absorbing material installation state which hollowed out the same outer circumference side 第３の実施の形態による固定ハブコーンの内側に空洞を作った状態を示す図The figure which shows the state which made the cavity inside the fixed hub cone by 3rd Embodiment 同固定ハブコーンに挿入する吸音材の内側をくりぬいた状態を示す図The figure which shows the state where the inside of the sound-absorbing material inserted into the fixed hub cone was hollowed out 同固定ハブコーンに挿入する吸音材の内側をくりぬいた状態を示す図The figure which shows the state where the inside of the sound-absorbing material inserted into the fixed hub cone was hollowed out 本発明の実施例の計測パターンを示す図The figure which shows the measurement pattern of the Example of this invention 実施例における騒音測定位置を示す図The figure which shows the noise measurement position in an Example 吸い込み１．５ｍでの周波数測定結果を示す図The figure which shows the frequency measurement result with suction 1.5m 真横１．５ｍでの周波数測定結果を示す図The figure which shows the frequency measurement result in just 1.5m 実施例における実験結果を示す図The figure which shows the experimental result in an Example 従来の２段の羽根車を用いた軸流送風機を示す図The figure which shows the axial-flow fan using the conventional 2-stage impeller

符号の説明Explanation of symbols

１Ａ 吸音材
１Ｂ 吸音材
１Ｃ 吸音材
１Ｄ 吸音材
１Ｅ 吸音材
１Ｆ 吸音材
１Ｇ 吸音材
２ モータ
３ 羽根車
４ 送風筒
５ 消音筒
６ 固定ハブコーン
７ 内筒
８ 外筒
８Ａ カバー
８Ｂ カバー
９ 支持棒
１０ 支持板 1A Sound Absorbing Material 1B Sound Absorbing Material 1C Sound Absorbing Material 1D Sound Absorbing Material 1E Sound Absorbing Material 1F Sound Absorbing Material 1G Sound Absorbing Material 2 Motor 3 Impeller 4 Blower Cylinder 5 Silencer Cylinder 6 Fixed Hub Cone 7 Inner Cylinder 8 Outer Cylinder 8A Cover 8B Cover 9 Support Rod 10 Board

Claims (9)

筒型ケーシング内に、モータと、このモータの回転軸に装着した羽根車とを備えた軸流送風機において、前記筒型ケーシングは、内筒とその周囲に設けた外筒とで構成され、内筒と外筒の間を吸音材挿入部とし、この吸音材挿入部にボードタイプの吸音材を内周側と外周側に２枚重ねて挿入することを特徴とする軸流送風機。 In an axial fan provided with a motor and an impeller mounted on the rotating shaft of the motor in the cylindrical casing, the cylindrical casing is composed of an inner cylinder and an outer cylinder provided around the inner cylinder, An axial blower characterized in that a sound absorbing material insertion portion is provided between the tube and the outer tube, and two board type sound absorbing materials are inserted into the sound absorbing material insertion portion in an inner peripheral side and an outer peripheral side. 内周側に設けた吸音材は、外周側に設けた吸音材よりも密度を小さくすることを特徴とする請求項１記載の軸流送風機。 The axial flow blower according to claim 1, wherein the sound absorbing material provided on the inner peripheral side has a lower density than the sound absorbing material provided on the outer peripheral side. 外周側に設けた吸音材には、空気層を形成する穴を設けたことを特徴とする請求項１または２記載の軸流送風機。 The axial blower according to claim 1 or 2, wherein the sound absorbing material provided on the outer peripheral side is provided with a hole for forming an air layer. 外周側に設けた吸音材には、格子状に貫通孔を設けたことを特徴とする請求項１または２記載の軸流送風機。 The axial blower according to claim 1 or 2, wherein the sound absorbing material provided on the outer peripheral side is provided with through holes in a lattice shape. 筒型ケーシング内に、モータと、このモータの回転軸に装着した羽根車とを備えた軸流送風機において、前記筒型ケーシングは、内筒とその周囲に設けた外筒とで構成され、内筒と外筒の間を吸音材挿入部とし、吸音材挿入部には、内周側にボードタイプの吸音材を設け、外周側を空気層としたことを特徴とする軸流送風機。 In an axial fan provided with a motor and an impeller mounted on the rotating shaft of the motor in the cylindrical casing, the cylindrical casing is composed of an inner cylinder and an outer cylinder provided around the inner cylinder, An axial blower characterized in that a sound absorbing material insertion portion is provided between a cylinder and an outer tube, a board type sound absorbing material is provided on the inner peripheral side of the sound absorbing material insertion portion, and an outer peripheral side is an air layer. 前記外筒の内側に複数の吸音材支持棒を内周側に向けて立設し、この吸音材支持棒によって内周側の吸音材を押さえつける構成の請求項５記載の軸流送風機。 The axial flow blower according to claim 5, wherein a plurality of sound absorbing material support bars are erected on the inner peripheral side of the outer cylinder, and the sound absorbing material on the inner peripheral side is pressed by the sound absorbing material support bars. 前記外筒の内側に複数の吸音材支持板を内周側に向けて立設し、この吸音材支持板によって内周側の吸音材を押さえつける構成の請求項５記載の軸流送風機。 The axial flow blower according to claim 5, wherein a plurality of sound absorbing material support plates are erected on the inner peripheral side of the outer cylinder, and the sound absorbing material on the inner peripheral side is pressed by the sound absorbing material support plates. 前記吸音材支持板には、複数の開口を設けた請求項７記載の軸流送風機。 The axial-flow fan according to claim 7, wherein the sound absorbing material support plate is provided with a plurality of openings. 筒型ケーシング内に、モータと、このモータの回転軸に装着した羽根車とを備えた軸流送風機において、前記モータの回転軸前後にハブコーンを設け、このハブコーン内部には、外周側に吸音材を設け、その内側を空洞にしたことを特徴とする軸流送風機。 In an axial fan provided with a motor and an impeller mounted on the rotating shaft of the motor in a cylindrical casing, a hub cone is provided before and after the rotating shaft of the motor, and a sound absorbing material is provided on the outer peripheral side inside the hub cone. An axial blower characterized by having a hollow inside.
JP2008140360A 2008-05-29 2008-05-29 Axial flow blower Pending JP2009287452A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008140360A JP2009287452A (en) 2008-05-29 2008-05-29 Axial flow blower

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008140360A JP2009287452A (en) 2008-05-29 2008-05-29 Axial flow blower

Publications (1)

Publication Number Publication Date
JP2009287452A true JP2009287452A (en) 2009-12-10

Family

ID=41456914

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2008140360A Pending JP2009287452A (en) 2008-05-29 2008-05-29 Axial flow blower

Country Status (1)

Country Link
JP (1) JP2009287452A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101749285A (en) * 2010-01-15 2010-06-23 汪祥 Fan with silencer
CN103047177A (en) * 2012-12-19 2013-04-17 平安电气股份有限公司 Mining combined local fan with tandem cascade
CN105402169A (en) * 2015-11-25 2016-03-16 平安电气股份有限公司 Air outlet silencer for local ventilator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101749285A (en) * 2010-01-15 2010-06-23 汪祥 Fan with silencer
CN103047177A (en) * 2012-12-19 2013-04-17 平安电气股份有限公司 Mining combined local fan with tandem cascade
CN105402169A (en) * 2015-11-25 2016-03-16 平安电气股份有限公司 Air outlet silencer for local ventilator

Similar Documents

Publication Publication Date Title
JP4772272B2 (en) Acoustic liner, fluid compression device and method of using the same
US20080152480A1 (en) Diagonal flow fan
JP2010071475A (en) Ceiling embedded ventilation fan
KR970009718A (en) Sound absorption room which lengthened exhaust channel of vacuum cleaner
JP2008075648A (en) Device for soundproofing gas turbine helicopter engine and engine obtained using the same
JP2020165355A (en) Axial blower
JP2009287452A (en) Axial flow blower
JP2007321735A (en) Muffling device for blower and muffling material for blower
JP2009197623A (en) Centrifugal blower
RU2019102887A (en) NOISE SILENCER FOR CENTRIFUGAL COMPRESSOR UNIT
JP4278252B2 (en) Noise reduction mechanism of fan device
JP5309516B2 (en) Centrifugal blower
JP5135967B2 (en) Centrifugal blower
JP6023968B2 (en) Ventilation equipment
JP2009092009A (en) Centrifugal blower
CN101396823A (en) Quieter of pneumatic tool
JP5309737B2 (en) Centrifugal blower
JP6277419B2 (en) Blower
JP5617906B2 (en) Centrifugal blower
JP2007102028A (en) Sound absorbing structure
KR100481788B1 (en) A concavity housing for ventilator
JP2011113697A (en) Air supply system for fuel cell
JP2005344956A (en) Noise reduction ventilating hole
JP2010174634A (en) Sound isolating device for compressor
JP5164801B2 (en) Centrifugal multiblade blower