JP2011163300A - Blower - Google Patents

Blower Download PDF

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JP2011163300A
JP2011163300A JP2010029802A JP2010029802A JP2011163300A JP 2011163300 A JP2011163300 A JP 2011163300A JP 2010029802 A JP2010029802 A JP 2010029802A JP 2010029802 A JP2010029802 A JP 2010029802A JP 2011163300 A JP2011163300 A JP 2011163300A
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Prior art keywords
blower
air
chamber
muffler
silencing
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JP2010029802A
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Japanese (ja)
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JP5620690B2 (en
Inventor
Hideaki Takano
秀明 高野
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Makita Corp
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Makita Corp
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Priority to JP2010029802A priority Critical patent/JP5620690B2/en
Priority to US13/024,722 priority patent/US20110200426A1/en
Priority to RU2011105456/06A priority patent/RU2011105456A/en
Priority to CN2011100413405A priority patent/CN102162473A/en
Priority to EP11154387.2A priority patent/EP2360378B1/en
Publication of JP2011163300A publication Critical patent/JP2011163300A/en
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Publication of JP5620690B2 publication Critical patent/JP5620690B2/en
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    • 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
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
    • E01H1/08—Pneumatically dislodging or taking-up undesirable matter or small objects; Drying by heat only or by streams of gas; Cleaning by projecting abrasive particles
    • E01H1/0809—Loosening or dislodging by blowing ; Drying by means of gas streams
    • 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
    • F04D29/02—Selection of particular materials
    • 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
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/626—Mounting or removal of fans
    • 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
    • F04D29/665—Sound attenuation by means of resonance chambers or interference

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Harvester Elements (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blower with a simple structure inexpensively which can reduce air blowing sound without using a conventionally used muffler or a special sound absorbing material in view of that the air blowing sound by a fan is large and noise reduction is required in the blower used for auxiliary work such as blowing and collecting dust in construction sites. <P>SOLUTION: In the blower, a noise eliminating chamber 21 is juxtaposed on an air flow passage 16 of an air flow port 11, and the noise eliminating chamber 21 is communicated with the air flow passage 16 through a noise eliminating hole 22. Inflow/outflow of air is generated between the air flow passage 16 and the noise eliminating chamber 21 by pressure change of the air flow, and energy of the sound is converted to frictional heat energy, and the noise can be reduced. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

この発明は、例えば建築作業現場において、発生した粉塵等に風を吹き当てて寄せ集めるための送風機あるいは逆に粉塵等を吸塵するための集塵機として用いられるブロワに関する。   The present invention relates to a blower used, for example, as a blower for blowing and collecting generated dust or the like in a construction work site or a dust collector for sucking dust or the like.

従来、この種のブロワは、本体ハウジングに内装したファンをモータで回転させ、これにより本体ハウジングに設けた吸気口から送風口に至る風の流れを発生させて、送風口から送風し、かつ吸気口から吸塵する構成を備えている。このため、このブロワでは、モータの駆動音とは別に、吸気口から送風口に向かう風の流れによって騒音（送風音）が発生する。従って、この種のブロワでは送風音の低騒音化が望まれている。
従来、この種のブロワに関する技術が下記の特許文献に開示されている。特許文献１には使用中に発生する静電気を除去するための技術が開示されており、特許文献２には低騒音化のための技術が開示されている。後者の特許文献２に開示された低騒音化技術は、吸気口と送風口にそれぞれ多数の小孔を備えた筒体形のマフラーと特殊な吸音材を介在させて特定周波数帯域の騒音を低減する構成となっていた。 Conventionally, this type of blower rotates a fan built in the main body housing with a motor, thereby generating a flow of air from the air intake port to the air supply port provided in the main body housing, and blowing air from the air intake port. It has a structure that absorbs dust from the mouth. For this reason, in this blower, noise (air blowing sound) is generated by the flow of air from the air inlet to the air outlet, in addition to the driving sound of the motor. Therefore, in this type of blower, it is desired to reduce the blowing sound.
Conventionally, techniques relating to this type of blower are disclosed in the following patent documents. Patent Document 1 discloses a technique for removing static electricity generated during use, and Patent Document 2 discloses a technique for reducing noise. The noise reduction technique disclosed in the latter patent document 2 reduces noise in a specific frequency band by interposing a cylindrical muffler having a large number of small holes at each of the air inlet and the air outlet and a special sound absorbing material. It was a composition.

特開２００１−５０１９６号公報JP 2001-50196 A 特開昭４５−３０３８９号公報JP-A-45-30389

しかしながら、各種の作業現場で補助的に用いられるブロワについて、上記マフラーや特殊な吸音材を備えた構成とすることはその構成の複雑化を招き、また大きなコストアップを招く問題がある。主として作業者が手に持って使用する軽量かつコンパクトなブロワについて、そのまま上記従来の技術を適用するのではなく、より簡易かつ低コストな構成で同等の低騒音化を実現できることが望ましい。
本発明は、この種のブロワにおいて、従来にない簡易かつ低コストな構成でその低騒音化を図ることを目的とする。 However, regarding a blower that is used supplementarily at various work sites, the configuration provided with the muffler and the special sound absorbing material has a problem in that the configuration is complicated and the cost is greatly increased. It is desirable that a light and compact blower that is mainly used by an operator in hand and not have the above-described conventional technique applied as it is, but can achieve equivalent noise reduction with a simpler and lower cost configuration.
It is an object of the present invention to reduce the noise of a blower of this type with a simple and low-cost configuration that has not been conventionally available.

このため、本発明は、特許請求の範囲の各請求項に記載した構成のブロワとした。
請求項１記載のブロワによれば、ファンの回転により送風口に風の流れ（送風）が発生する。この送風には、ファンの羽根数や回転数に基づいて高圧領域と低圧領域が送風方向に繰り返される圧力変化（脈動）が発生する。このため、送風路に送風が発生すると、その圧力変化により送風の一部が消音孔を経て送風路と消音室との間で出入りする空気の流れが発生する。消音孔を経て送風路と消音室との間で空気の流れが発生すると、消音孔を通過する空気と消音孔の縁部との間の摩擦による摩擦熱が発生するため、送風音の音エネルギーが摩擦（熱）エネルギーに変換され、これにより送風音が低減（消音化）される。
このように、送風路に併設して消音室を区画形成し、この消音室と送風路を消音孔で連通して消音するヘルムホルツ共鳴器の原理を利用して送風音の一次成分を低減する構成であり、従来のマフラーや特殊な消音材を用いて消音する構成ではないので簡易かつ低コストな構成で高い消音（吸音）効果を得ることができる。
このような簡易かつ低コストな構成で高い消音効果を得ることができるので、比較的軽作業かつ補助的な送風作業若しくは集塵作業に用いられるブロワとして好適に実施することができる。
請求項２記載のブロワによれば、送風路に消音室と消音孔を併設した送風口及びこれを備えた本体ハウジングの製作及び組み立て工程の簡略化を図ることができる。
請求項３記載のブロワによれば、左右半割りハウジングの送風口となる部分に壁部を設定し、これを左右突き合わせれば消音室と消音孔が形成されることから、その製作工程及び組み立て工程を一層簡略化して低コスト化を図ることができる。
請求項４記載のブロワによれば、より効率よく消音効果を得ることができる。
請求項５記載のブロワによれば、別途製作した消音アダプタを本体ハウジングの送風口に取り付ければ、請求項１記載の騒音低減構造と同様の消音効果を得ることができる。このように、送風路に併設する消音室と両者を連通する消音孔は、本体ハウジング側に一体に設ける構成の他、本体ハウジングとは別途用意したアダプタに設ける構成とすることのいずれであっても同じ消音効果を得ることができ、また構成の簡略化及び低コスト化を図ることができる。 For this reason, this invention was set as the blower of the structure described in each claim of a claim.
According to the blower described in claim 1, a wind flow (fan) is generated at the blower opening by the rotation of the fan. In this air blowing, a pressure change (pulsation) is generated in which the high pressure region and the low pressure region are repeated in the air blowing direction based on the number of blades and the number of rotations of the fan. For this reason, when ventilation is generated in the ventilation path, a flow of air is generated between the ventilation path and the silencing chamber, part of the ventilation passing through the silencing hole due to the pressure change. When an air flow is generated between the air passage and the silencing chamber through the silencing hole, frictional heat is generated by friction between the air passing through the silencing hole and the edge of the silencing hole. Is converted into frictional (thermal) energy, which reduces blowing noise (silence).
In this way, a structure for reducing the primary component of the blowing sound by using the principle of a Helmholtz resonator that forms a silencing chamber along with the ventilation path, and silences the silencing chamber and the ventilation path by communicating with the silencing hole. In addition, since it is not a configuration for silencing using a conventional muffler or a special silencing material, a high silencing (sound absorbing) effect can be obtained with a simple and low-cost configuration.
Since a high noise reduction effect can be obtained with such a simple and low-cost configuration, it can be suitably implemented as a blower used for relatively light work and auxiliary air blowing work or dust collection work.
According to the blower of the second aspect, it is possible to simplify the manufacturing and assembling process of the blower opening provided with the sound deadening chamber and the sound deadening hole in the blower passage and the main body housing including the blower opening.
According to the blower of the third aspect, since the wall portion is set in the portion which becomes the blower opening of the left and right half housing, and the left and right sides are brought into contact with each other, the silencing chamber and the silencing hole are formed. The process can be further simplified and the cost can be reduced.
According to the blower according to the fourth aspect, the silencing effect can be obtained more efficiently.
According to the blower of Claim 5, if the silencer adapter produced separately is attached to the ventilation opening of a main body housing, the same silencing effect as the noise reduction structure of Claim 1 can be acquired. As described above, the silencing chamber that is provided in the air passage and the silencing hole that communicates the two are either provided integrally on the main body housing side, or are configured to be provided on an adapter that is prepared separately from the main body housing. The same silencing effect can be obtained, and the configuration can be simplified and the cost can be reduced.

本発明の実施形態を示す図で、ブロワの全体側面図である。本図では送風口周辺が縦断面で示されている。It is a figure which shows embodiment of this invention, and is a whole side view of a blower. In this figure, the periphery of the air blowing port is shown in a longitudinal section. 図１の(II)矢視図であって、ブロワの平面図である。本図では、送風口周辺が得横断面で示されている。FIG. 2 is a view as viewed in the direction of arrow (II) in FIG. 1 and is a plan view of the blower. In this figure, the ventilation port periphery is shown by the obtained cross section. 図１の(III)-(III)線矢視図であって、送風口の縦断面図である。It is the (III)-(III) arrow directional view of FIG. 1, Comprising: It is a longitudinal cross-sectional view of a ventilation port. 騒音低減部の拡大側面図である。It is an enlarged side view of a noise reduction part. 第２実施形態に係る騒音低減構造を示す図であって、吹き出し口及び消音アダプタの縦断面図である。It is a figure which shows the noise reduction structure which concerns on 2nd Embodiment, Comprising: It is a longitudinal cross-sectional view of a blower outlet and a muffler adapter.

次に、本発明の実施形態を図１〜図５に基づいて説明する。図１は、本実施形態に係るブロワ１を示している。このブロワ１は、本体ハウジング１０に駆動源としての電動モータ２を内装した構成を備えている。本体ハウジング１０の前部に筒体形の送風口１１が一体に設けられ、下部にスリット形状の複数の吸気口１２〜１２が設けられている。また、本体ハウジング１０の後部には、ループ形のハンドル部１３が設けられ、その下側に電源としてのバッテリパック１４が装着されている。このバッテリパック１４を電源として電動モータ２が起動する。このバッテリパック１４は取り外して、別途用意した充電器で充電することにより繰り返し使用することができる。ハンドル部１３の上部には、押しボタン式の起動スイッチ１３ａと停止スイッチ１３ｂが設けられている。起動スイッチ１３ａを押し操作すると電動モータ２が起動し、停止スイッチ１３ｂを押し操作すると電動モータ２が停止する。
電動モータ２の出力軸に、ファン３が取り付けられている。例示したファン３にはいわゆる遠心ファンが用いられている。ファン３は、９枚のフィン３ａ〜３ａを備えている。図２及び図３に示すように本体ハウジング１０のほぼ中央には側方へ円板形に張り出すファンケース部１５が設けられている。電動モータ２の起動によりファン３が回転すると、吸気口１２から外気が吸気され、これが各フィン３ａから放射方向に吹き出されてファンケース部１５の内面に吹き当てられ、これにより図２において反時計回り方向の旋回流となって順次送風口１１から吹き出される。
この送風口１１に、送風音を低減するための騒音低減部２０が設けられている。本実施形態に係るブロワ１は、この騒音低減部２０について特徴を有するもので、その他ブロワ１としての基本的な構成については従来と同様の構成で足りる。 Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a blower 1 according to this embodiment. The blower 1 has a configuration in which an electric motor 2 as a drive source is built in a main body housing 10. A cylindrical air blowing port 11 is integrally provided at the front portion of the main body housing 10, and a plurality of slit-shaped air intake ports 12 to 12 are provided at the lower part. In addition, a loop-shaped handle portion 13 is provided at the rear portion of the main body housing 10, and a battery pack 14 as a power source is mounted on the lower side thereof. The electric motor 2 is activated using the battery pack 14 as a power source. The battery pack 14 can be removed and used repeatedly by charging with a separately prepared charger. A push button type start switch 13 a and stop switch 13 b are provided on the top of the handle portion 13. When the start switch 13a is pushed and operated, the electric motor 2 is started, and when the stop switch 13b is pushed and operated, the electric motor 2 is stopped.
A fan 3 is attached to the output shaft of the electric motor 2. The illustrated fan 3 is a so-called centrifugal fan. The fan 3 includes nine fins 3a to 3a. As shown in FIGS. 2 and 3, a fan case portion 15 is provided in the center of the main body housing 10 so as to project laterally into a disc shape. When the fan 3 is rotated by the activation of the electric motor 2, the outside air is sucked from the air inlet 12 and is blown out radially from the fins 3a and blown to the inner surface of the fan case portion 15, thereby counterclockwise in FIG. A swirling flow in the rotating direction is sequentially blown out from the air blowing port 11.
The air outlet 11 is provided with a noise reduction unit 20 for reducing the blowing sound. The blower 1 which concerns on this embodiment has the characteristic about this noise reduction part 20, About the fundamental structure as the other blower 1, the structure similar to the past is sufficient.

本体ハウジング１０は、いわゆる樹脂製ハウジングで、それぞれ個別に一体成形された左右の半割りハウジング１０Ｌ，１０Ｒを相互に突き合わせて結合した半割り構造を備えている。両半割りハウジング１０Ｌ、１０Ｒは、図１中白抜きの矢印で示した送風方向について左右に二分されている。図２，３では、左右半割りハウジング１０Ｌ，１０Ｒの突き合わせ面に符号Ｊが付されている。左右の半割りハウジング１０Ｌ，１０Ｒは、ファンケース部１５を除いて概ね相互に左右対称に構成されている。本体ハウジング１０の送風口１１、吸気口１２、ハンドル部１３となる各部分については、両半割りハウジング１０Ｌ，１０Ｒにそれぞれ一体に成形されている。
本体ハウジング１０の前部に一体に設けられた送風口１１はほぼ円筒形状を有しており、本体ハウジングの半割り構造に合わせて左右の半割り構造を有している。また、送風口１１に設けた騒音低減部２０も左右半割り構造を備えている。このため、左右の半割りハウジング１０Ｌ，１０Ｒを相互に突き合わせて本体ハウジング１０が形成されると、これとともに送風口１１及び騒音低減部２０が形成される。
送風口１１の内部には、上側の上壁部１６ａと下側の下壁部１６ｂが一体に形成されている。この上壁部１６ａと下壁部１６ｂとの間に、送風路１６が区画形成されている。この送風路１６の風上側はファンケース部１５内に連通されており、ファン３の回転により発生する送風は、この送風路１６を経て送風口１１に取り付けたノズルの先端から吹き出される。 The main body housing 10 is a so-called resin housing, and includes a half structure in which left and right half housings 10L and 10R, which are individually formed integrally with each other, are connected to each other. Both the half-split housings 10L and 10R are divided into right and left in the air blowing direction indicated by the white arrows in FIG. In FIGS. 2 and 3, the abutting surfaces of the left and right half housings 10L and 10R are marked with a symbol J. The left and right half housings 10 </ b> L and 10 </ b> R are generally symmetrical with each other except for the fan case portion 15. The portions of the main body housing 10 that will be the air outlet 11, the air inlet 12, and the handle portion 13 are formed integrally with the half housings 10L and 10R, respectively.
The air blowing port 11 provided integrally with the front portion of the main body housing 10 has a substantially cylindrical shape, and has a left and right half structure in accordance with the half structure of the main body housing. Moreover, the noise reduction part 20 provided in the ventilation port 11 is also provided with the right-and-left half structure. For this reason, when the main body housing 10 is formed by abutting the left and right half housings 10L and 10R with each other, the air blowing port 11 and the noise reduction unit 20 are formed together therewith.
An upper upper wall portion 16a and a lower lower wall portion 16b are integrally formed inside the air blowing port 11. An air passage 16 is defined between the upper wall portion 16a and the lower wall portion 16b. The windward side of the air passage 16 is communicated with the fan case portion 15, and the air generated by the rotation of the fan 3 is blown out from the tip of the nozzle attached to the air outlet 11 through the air passage 16.

図４に騒音低減部２０の詳細が示されている。この騒音低減部２０は、この送風路１６の下側に設けられている。この騒音低減部２０は、消音室２１と消音孔２２を備えている。消音室２１は、下壁部１６ｂとその下面側に一体に成形した円弧形状の底壁部２１ａと前後の壁部２１ｂ，２１ｃによって区画形成されている。消音孔２２は、下壁部１６ｂに形成されている。この消音孔２２を経て消音室２１が送風路１６に連通されている。消音室２１は、この消音孔２２を除いて他の空間部に対して気密に閉塞されている。
上下壁部１６ａ，１６ｂと底壁部２１ａと前後の壁部２１ｂ，２１ｃと消音孔２２は、本体ハウジング１０の左右半割り構造に合わせて同じ左右半割り構造を有している。従って、左右半割りハウジング１０Ｌ，１０Ｒの送風口１１となる部分に一体に成形した各壁部が左右相互に突き合わされてそれぞれ上下壁部１６ａ，１６ｂと底壁部２１ａと前後の壁部２１ｂ，２１ｃと消音孔２２が形成される。このため、左右半割りハウジング１０Ｌ，１０Ｒを突き合わせて本体ハウジング１０が形成されれば、これら各壁部が同時に突き合わされて消音室２１と消音孔２２が同時に形成され、従って上記したように当該騒音低減部２０が同時に形成される。従って、消音室２１及び消音孔２２について特別の手間を掛けることなく当該騒音低減部２０が形成される。 FIG. 4 shows details of the noise reduction unit 20. The noise reduction unit 20 is provided below the air passage 16. The noise reduction unit 20 includes a silencing chamber 21 and a silencing hole 22. The silencer chamber 21 is defined by a lower wall portion 16b, an arc-shaped bottom wall portion 21a formed integrally with the lower surface thereof, and front and rear wall portions 21b and 21c. The silencing hole 22 is formed in the lower wall portion 16b. The silencing chamber 21 communicates with the air passage 16 through the silencing hole 22. The muffler chamber 21 is airtightly closed with respect to other space portions except for the muffler holes 22.
The upper and lower wall portions 16 a, 16 b, the bottom wall portion 21 a, the front and rear wall portions 21 b, 21 c, and the muffler hole 22 have the same left and right half structure according to the left and right half structure of the main body housing 10. Accordingly, the wall portions formed integrally with the left and right half housings 10L and 10R that are to be the air blowing ports 11 are abutted with each other on the left and right sides, and the upper and lower wall portions 16a and 16b, the bottom wall portion 21a, and the front and rear wall portions 21b, respectively. 21c and a silencing hole 22 are formed. For this reason, if the main body housing 10 is formed by abutting the left and right half housings 10L and 10R, these wall portions are simultaneously abutted to form the silencing chamber 21 and the silencing hole 22 at the same time. The reduction part 20 is formed simultaneously. Therefore, the noise reduction unit 20 is formed without any special effort for the silencer chamber 21 and the silencer hole 22.

このように設けた騒音低減部２０によれば、送風路１６内の送風にはファン３の羽根数に対応した圧力変化（脈動）が発生し、この圧力変化によって当該送風路１６と消音室２１との間で空気の出入り（流れ）が発生する（ヘルムホルツ共鳴器の原理）。消音孔２２を経て送風路１６と消音室２１との間で空気の出入りが発生すると、消音孔２２の縁部とこれを通過する空気との間で摩擦が発生し、その結果摩擦熱が発生する。こうして摩擦熱が発生することにより、送風路１６を通過する送風の音エネルギーが熱エネルギーに変換され、その分だけ送風音が低減される。
消音室２１の容積と消音孔２２の孔径は、ファン３の羽根数と回転数等の要因により変化する周波数に合わせて適切に設定されている。本実施形態では、前記したように９枚の羽根（フィン）を有するファン３の回転数が１６，０００ｒｐｍに設定されていることから、送風音の周波数は約２．４ｋＨｚとなっている。これに対して消音室２１の容積は、１４，１００ｍｍ3に設定され、消音孔２２は直径２５ｍｍで形成されて、その深さとなる下壁部１６ｂの肉厚ｔは１．５ｍｍに設定されている。このように各部の寸法設定を適切に行うことにより、高い騒音低減効果が得られることが本出願人の検証によって確認されている。例示した構成の場合、送風口１１から吹き出される送風の一次成分の騒音レベルが、特別の騒音低減機能を備えない現行機に比して約５〜１０ｄＢ程度低下することが確認され、これにより甲高い耳障りな音がなくなりかつその音質も改善され、この点で当該ブロワ１の使い勝手を向上させることができた。 According to the noise reduction unit 20 provided in this way, a pressure change (pulsation) corresponding to the number of blades of the fan 3 is generated in the air blowing in the air blowing path 16, and the air blowing path 16 and the muffler chamber 21 are caused by this pressure change. Air enters and exits (flows) between them (the principle of Helmholtz resonators). When air enters and exits between the air flow path 16 and the sound deadening chamber 21 through the sound deadening hole 22, friction is generated between the edge of the sound deadening hole 22 and the air passing therethrough, resulting in frictional heat. To do. By generating frictional heat in this way, the sound energy of the blast passing through the air passage 16 is converted into heat energy, and the blast sound is reduced accordingly.
The volume of the silencing chamber 21 and the diameter of the silencing hole 22 are appropriately set in accordance with the frequency that varies depending on factors such as the number of blades and the number of rotations of the fan 3. In this embodiment, since the rotation speed of the fan 3 having nine blades (fins) is set to 16,000 rpm as described above, the frequency of the blowing sound is about 2.4 kHz. On the other hand, the volume of the silencing chamber 21 is set to 14,100 mm 3 , the silencing hole 22 is formed with a diameter of 25 mm, and the wall thickness t of the lower wall portion 16b which is the depth is set to 1.5 mm. Yes. It has been confirmed by the applicant's verification that a high noise reduction effect can be obtained by appropriately setting the dimensions of the respective parts as described above. In the case of the exemplified configuration, it is confirmed that the noise level of the primary component of the air blown out from the air outlet 11 is reduced by about 5 to 10 dB as compared with the current machine that does not have a special noise reduction function. The harsh and harsh sound disappeared and the sound quality was improved, and the usability of the blower 1 was improved in this respect.

以上のように構成した本実施形態のブロワ１によれば、送風口１１に設けた騒音低減部２０によって送風音が低減される。この騒音低減部２０は、送風路１６に併設した消音室２１と両者を連通する消音孔２２を備え、これらは本体ハウジング１０に一体に成形されて半割り構造を有することから当該本体ハウジング１０が形成されれば同時に形成される。これは、半割りハウジング１０Ｌ，１０Ｒを成形するための成形型の比較的容易な変更のみよって実現することができる。このことから、本実施形態によれば、従来のマフラーや特別の消音材を用いる構成に比して簡易かつ低コストな騒音低減部２０を実現できる。   According to the blower 1 of the present embodiment configured as described above, the blowing sound is reduced by the noise reduction unit 20 provided in the blowing port 11. The noise reduction unit 20 includes a silencing chamber 21 provided in the air passage 16 and a silencing hole 22 that communicates both of them, and these are integrally formed with the main body housing 10 and have a halved structure. If formed, they are formed simultaneously. This can be realized only by a relatively easy change of the mold for molding the half housings 10L and 10R. From this, according to this embodiment, the noise reduction part 20 simpler and low-cost can be implement | achieved compared with the structure which uses the conventional muffler and a special silencer.

以上説明した第１実施形態には、種々変更を加えることができる。例えば、例示した第１実施形態では、騒音低減部２０を備える送風口１１が左右半割り構造の本体ハウジング１０に一体に設けられた構成を例示したが、別体で製作されて適宜交換して本体ハウジングに装着可能とした送風口に設ける構成としてもよい。係る本体ハウジングとは別体の送風口は、騒音低減用の消音アダプタとして用いることができる。この消音アダプタによれば、特別の騒音低減構造を備えない既存のブロワに装着（後付け）することにより同等の騒音低減効果を得ることができる。係る構成が特許請求の範囲の請求項５に記載した発明の実施形態に相当する。
この第２実施形態に係る消音アダプタ３０が図５に示されている。図５ではブロワ１の前部に設けた送風口１７のみが示されている。ブロワ１の基本的構成は前記第１実施形態と同じで特に変更を要しない。この送風口１７には、前記例示した消音部２０は設けられていない。この送風口１７に対して消音アダプタ３０を脱着することができる。
消音アダプタ３０は、概ね筒体形状を有し、本体ハウジング１０と同じく樹脂製の左右の半割り構造を有している。この消音アダプタ３０の内周側において上壁部３１ａと下壁部３１ｂによって送風路３１が区画形成されている。当該消音アダプタ３０の送風口１７への取り付け状態ではその送風路１６に送風路３１が連通される。
消音アダプタ３０には上下２つの騒音低減部３２，３３が設けられている。下側の騒音低減部３２は、下壁部３１ｂに沿って設けた消音室３２ａと下壁部３１ｂに設けた消音孔３２ｂを備えている。上側の騒音低減部３３は、上壁部３１ａに沿って設けた消音室３３ａと上壁部３１ａに設けた消音孔３３ｂを備えている。下側の消音室３２ａと上側の消音室３３ａはそれぞれ消音孔３２ｂ，３３ｂを除いて密閉空間に区画されている。下側及び上側の消音孔３２ｂ，３３ｂの孔径は、それぞれファン３の羽根数と回転数等の要因により変化する送風音の周波数に基づいて適切に設定されている。
このように構成した消音アダプタ３０によって、前記第１実施形態と同様の作用効果を得ることができる。さらに、ブロワ本体側の送風口に対して脱着可能な消音アダプタ３０であるので、特別の騒音低減機能を備えない既存のブロワに対して例示した消音アダプタ３０を装着することにより大きな騒音低減効果を得ることができ、この点で後付け用の消音アダプタ３０として利用することができる。 Various modifications can be made to the first embodiment described above. For example, in the illustrated first embodiment, the structure in which the air blowing port 11 including the noise reduction unit 20 is integrally provided in the main body housing 10 with the left and right halved structure is illustrated as an example. It is good also as a structure provided in the ventilation port which was able to be mounted | worn with a main body housing. The blower opening that is separate from the main body housing can be used as a muffler adapter for noise reduction. According to this silencer adapter, an equivalent noise reduction effect can be obtained by mounting (retrofitting) on an existing blower that does not have a special noise reduction structure. Such a configuration corresponds to an embodiment of the invention described in claim 5.
A muffler adapter 30 according to the second embodiment is shown in FIG. In FIG. 5, only the blower opening 17 provided in the front part of the blower 1 is shown. The basic configuration of the blower 1 is the same as that of the first embodiment, and no particular change is required. The blower port 17 is not provided with the muffler 20 exemplified above. The muffler adapter 30 can be attached to and detached from the air blowing port 17.
The muffler adapter 30 has a generally cylindrical shape, and has a left and right half structure made of resin, like the main body housing 10. On the inner peripheral side of the muffler adapter 30, an air passage 31 is defined by an upper wall portion 31a and a lower wall portion 31b. When the silencing adapter 30 is attached to the air outlet 17, the air passage 31 communicates with the air passage 16.
The muffler adapter 30 is provided with two upper and lower noise reduction units 32 and 33. The lower noise reduction unit 32 includes a silencing chamber 32a provided along the lower wall portion 31b and a silencing hole 32b provided in the lower wall portion 31b. The upper noise reduction unit 33 includes a silencing chamber 33a provided along the upper wall portion 31a and a silencing hole 33b provided in the upper wall portion 31a. The lower silencing chamber 32a and the upper silencing chamber 33a are partitioned into sealed spaces except for the silencing holes 32b and 33b, respectively. The diameters of the lower and upper silencing holes 32b and 33b are appropriately set based on the frequency of the blowing sound that varies depending on factors such as the number of blades and the rotational speed of the fan 3, respectively.
With the muffler adapter 30 configured as described above, it is possible to obtain the same functions and effects as those of the first embodiment. Furthermore, since the muffler adapter 30 is detachable from the blower opening on the blower body side, a large noise reduction effect can be obtained by installing the muffler adapter 30 exemplified for an existing blower that does not have a special noise reduction function. In this respect, it can be used as a mute adapter 30 for retrofitting.

以上説明した２実施形態にはさらに変更を加えることができる。例えば、消音室２１，３２ａ，３３ａの容積と消音孔２２，３２ｂ，３３ｂの孔径等の各部の寸法については、使用するファンの羽根数や回転数により変化する送風音の周波数に基づいて適宜変更して実施することができる。
また、一つの消音室について複数の消音孔を設ける構成としてもよく、送風方向に複数の消音室を配置する構成としてもよい。
さらに、バッテリパックを電源として内蔵モータを駆動させる充電式ブロワ１を例示したが、交流電源を電源とする交流式ブロワ、あるいはモータではなく内燃機関を駆動源とするエンジンブロワに適用することもできる。
また、送風口１１，１７若しくは消音アダプタ３０から送風するブロワ１を例示したがファンを逆回転させて送風口から集塵（吸気）する場合に適用することもでき、従って送風側（排気側）若しくは吸気側のいずれにも適用でき、要は風の流れが発生し、ファンの羽根数等の要因によって圧力変化が発生する場合に例示した騒音低減部を適用することができる。 The two embodiments described above can be further modified. For example, the dimensions of each part such as the volume of the muffler chambers 21, 32 a, 33 a and the hole diameters of the muffler holes 22, 32 b, 33 b are appropriately changed based on the frequency of the blowing sound that varies depending on the number of blades and the number of rotations of the fan used. Can be implemented.
Moreover, it is good also as a structure which provides a several silencing hole about one silencing room, and it is good also as a structure which arrange | positions a several silencing room in a ventilation direction.
Furthermore, although the rechargeable blower 1 that drives the built-in motor using the battery pack as a power source is illustrated, it can also be applied to an AC blower that uses an AC power source as a power source or an engine blower that uses an internal combustion engine as a drive source instead of a motor. .
Moreover, although the blower 1 that blows air from the air blowing ports 11 and 17 or the muffler adapter 30 is illustrated, the present invention can also be applied to the case where dust is collected (intake) from the air blowing port by rotating the fan in the reverse direction. Alternatively, the present invention can be applied to either the intake side, and in short, the noise reduction unit illustrated in the case where a flow of wind is generated and a pressure change is generated due to factors such as the number of fan blades can be applied.

１…ブロワ
２…電動モータ
３…ファン、３ａ…羽根（フィン）
１０…本体ハウジング
１０Ｌ…半割りハウジング（左）、１０Ｒ…半割りハウジング（右）
１１…送風口
１２…吸気口
１３…ハンドル部、１３ａ…起動スイッチ、１３ｂ…停止スイッチ
１４…バッテリパック
１５…ファンケース部
１６…送風路、１６ａ…上壁部、１６ｂ…下壁部
１７…送風口（第２実施形態）
２０…騒音低減部
２１…消音室、２１ａ…底壁部、２１ｂ…前壁部、２１ｃ…後壁部
２２…消音孔
３０…消音アダプタ
３１…送風路、３１ａ…上壁部、３１ｂ…下壁部
３２，３３…騒音低減部（第２実施形態）
３２ａ，３３ａ…消音室、３２ｂ，３３ｂ…消音孔
DESCRIPTION OF SYMBOLS 1 ... Blower 2 ... Electric motor 3 ... Fan, 3a ... Blade | wing (fin)
10 ... Main body housing 10L ... Half housing (left), 10R ... Half housing (right)
DESCRIPTION OF SYMBOLS 11 ... Air inlet 12 ... Air inlet 13 ... Handle part, 13a ... Start switch, 13b ... Stop switch 14 ... Battery pack 15 ... Fan case part 16 ... Air flow path, 16a ... Upper wall part, 16b ... Lower wall part 17 ... Air blow Mouth (second embodiment)
DESCRIPTION OF SYMBOLS 20 ... Noise reduction part 21 ... Silencer room, 21a ... Bottom wall part, 21b ... Front wall part, 21c ... Rear wall part 22 ... Silencer hole 30 ... Silencer adapter 31 ... Air flow path, 31a ... Upper wall part, 31b ... Lower wall Units 32, 33 ... Noise reduction unit (second embodiment)
32a, 33a ... silencer chamber, 32b, 33b ... silencer hole

Claims (5)

回転するファンを内装した本体ハウジングに吸気口と送風口を備えたブロワであって、前記送風口に送風路に消音室を併設し、該消音室と前記送風路との間を消音孔で連通したブロワ。 A blower having an air inlet and an air outlet in a main body housing with a rotating fan, wherein the air outlet is provided with a sound deadening chamber, and the sound deadening chamber communicates with the air passage through the sound deadening hole. Blower. 請求項１記載のブロワであって、前記本体ハウジングは、前記送風口の送風方向について左右に２分された半割り構造を備えており、該半割り構造に合わせて前記消音室と前記消音孔が半割り構造とされた低騒音化構造。 2. The blower according to claim 1, wherein the main body housing has a half-divided structure that is divided into right and left in the air blowing direction of the blower opening, and the sound deadening chamber and the sound deadening hole according to the half-split structure. A low noise structure with a half structure. 請求項２記載のブロワであって、前記本体ハウジングの左右半割りハウジングは、それぞれ樹脂の一体成形により形成されており、該半割りハウジングの前記送風口となる部分に一体成形した壁部が左右相互に突き合わされて前記消音室が区画形成されるとともに前記消音孔が形成される構成としたブロワ。 3. The blower according to claim 2, wherein the left and right half housings of the main body housing are each formed by integral molding of resin, and a wall portion integrally formed at a portion of the half housing serving as the air outlet is left and right. A blower configured to be abutted with each other to form the silencer chamber and to form the silencer hole. 請求項１〜３のいずれか１項に記載したブロワであって、前記ファンの羽根数と回転数に基づいて、前記消音室の容量と前記消音孔の孔径を設定したブロワ。 The blower according to any one of claims 1 to 3, wherein a capacity of the silencing chamber and a diameter of the silencing hole are set based on the number of blades and the number of rotations of the fan. 回転するファンを内装した本体ハウジングに吸気口と送風口を備えたブロワの前記送風口に装着する消音アダプタであって、内周側が送風路とされた筒体形を有し、前記送風路に併設された消音室と、該消音室を前記送風路に連通する消音孔を備えた消音アダプタ。
A muffler adapter that is mounted on the blower opening of a blower having an air inlet and a blower opening in a main body housing with a rotating fan, and has a cylindrical shape with an inner peripheral side serving as a blower path, and is attached to the blower path A muffler adapter comprising a muffler chamber and a muffler hole communicating the muffler chamber with the air passage.
JP2010029802A 2010-02-15 2010-02-15 Blower Active JP5620690B2 (en)

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JP2010029802A JP5620690B2 (en) 2010-02-15 2010-02-15 Blower
US13/024,722 US20110200426A1 (en) 2010-02-15 2011-02-10 Noise reduction devices for blowers
RU2011105456/06A RU2011105456A (en) 2010-02-15 2011-02-14 NOISE EXTINGUISHERS FOR BLOWERS
CN2011100413405A CN102162473A (en) 2010-02-15 2011-02-14 Blower
EP11154387.2A EP2360378B1 (en) 2010-02-15 2011-02-14 Blower with noise reduction device

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