JP2017186938A - Ventilation work machine - Google Patents

Ventilation work machine Download PDF

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Publication number
JP2017186938A
JP2017186938A JP2016075363A JP2016075363A JP2017186938A JP 2017186938 A JP2017186938 A JP 2017186938A JP 2016075363 A JP2016075363 A JP 2016075363A JP 2016075363 A JP2016075363 A JP 2016075363A JP 2017186938 A JP2017186938 A JP 2017186938A
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impeller
air passage
volute
tongue
length
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JP6727006B2 (en
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秀明 高野
Hideaki Takano
秀明 高野
拓郎 小西
Takuo Konishi
拓郎 小西
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Makita Corp
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Makita Corp
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Priority to JP2016075363A priority Critical patent/JP6727006B2/en
Priority to DE202016007447.5U priority patent/DE202016007447U1/en
Priority to CN201720219459.XU priority patent/CN206647279U/en
Publication of JP2017186938A publication Critical patent/JP2017186938A/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
    • F04D29/40—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
    • F04D29/422—Discharge tongues
    • 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

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

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation work machine capable of reducing noise occurring due to rotation of an impeller in a volute.SOLUTION: A ventilation work machine 10 is configured such that: at a position facing a position where air from an impeller 24 in a body part 21 of a volute 20 blows, formed is a tongue part 21c extending along a ventilation passage 21a from the most upstream side of the ventilation passage 21a toward a reverse direction to an air flow direction; a length of the tongue part 21c along the ventilation passage 21a is 2-3 times as long as an interval between a plurality of blade parts 24b of the impeller 24; and a length of the tongue part 21c along an axial direction of a rotational shaft AX of the impeller 24 is inclined so as to be made shorter toward a windward side.SELECTED DRAWING: Figure 3

Description

本発明は、ボリュートから噴き出させた空気によって落葉等を吹き集めるようにして清掃作業に用いる送風作業機に関する。   The present invention relates to a blower working machine that is used for cleaning work by blowing off fallen leaves and the like by air blown from a volute.

特許文献１には送風作業機が開示されており、この送風作業機は作業者が背負う背負フレームと、背負フレームに搭載したボリュートと、ボリュート内に回転可能に設けた羽根車と、羽根車を回転させるエンジンとを備えている。この送風作業機のボリュートは、内周部に渦形の送風路が形成され、渦形の送風路の中心軸の軸方向の一方となる前側に吸気開口部が形成された本体部と、本体部の外周部にて渦形の送風路が内部に連続した状態で形成されて、吸気開口部から吸い込んだ空気を噴出させる噴出筒部と有している。エンジンの駆動によってボリュート内で羽根車を回転させると、吸気開口部から本体部内に吸い込まれた空気は遠心方向に噴き出されて渦形の送風路で昇圧されて噴出筒部から噴出される。噴出筒部から噴き出された空気は噴出筒部に接続した送風管の先端から地面に向けて噴き出され、地面に広範囲に散る落葉等は吹き集められる。   Patent Document 1 discloses a blower working machine. This blower working machine includes a back frame carried by an operator, a volute mounted on the back frame, an impeller provided rotatably in the volute, and an impeller. And a rotating engine. The volute of this blower working machine has a main body portion in which a spiral air passage is formed in the inner peripheral portion, and an intake opening is formed on the front side which is one of the axial directions of the central axis of the spiral air passage. A vortex-shaped air passage is formed in a continuous state in the outer peripheral part of the part, and has an ejection cylinder part for ejecting air sucked from the intake opening. When the impeller is rotated in the volute by driving the engine, the air sucked into the main body from the intake opening is blown in the centrifugal direction, and the pressure is increased by the vortex-shaped air passage and is blown out from the blow-out cylinder. The air ejected from the ejection cylinder part is ejected toward the ground from the tip of the blower pipe connected to the ejection cylinder part, and the fallen leaves and the like scattered over the ground are collected.

特開２００２−２５７０９７号公報Japanese Patent Laid-Open No. 2002-257097

特許文献１の送風作業機においては、羽根車を回転させるエンジンによる騒音だけでなく、ボリュート内にて羽根車の回転により生じる騒音が問題となっている。ボリュート内にて羽根車の回転により生じる騒音は、ボリュートの本体部内の送風路の最も上流となる位置と送風路の下流部との間に設けられた舌部（図４の従来技術に示している）を回転する羽根車の各羽根部が通過するときの圧力の変化に起因していることを知得した。具体的には、回転する羽根車の羽根部が舌部を通過するときに舌部周辺で急激に圧力が上昇し、回転する羽根車の羽根部が舌部を通過し終えたときに舌部周辺で急激に圧力が下降し、各羽根部が舌部を通過する度に舌部周辺の圧力の急上昇と急降下を繰り返すことによって生じる音波が羽根車の回転により生じる騒音の一因となっている。本発明は、送風作業機において、ボリュート内にて羽根車の回転により生じる騒音を低減させることを目的とする。   In the blower working machine of Patent Document 1, not only noise due to the engine rotating the impeller but also noise generated by rotation of the impeller in the volute is a problem. Noise generated by the rotation of the impeller in the volute is caused by a tongue portion (shown in the prior art in FIG. 4) provided between the position upstream of the air passage in the main body of the volute and the downstream portion of the air passage. It was found that this was caused by a change in pressure when each blade part of the rotating impeller passed through. Specifically, when the blade portion of the rotating impeller passes through the tongue portion, pressure suddenly increases around the tongue portion, and when the blade portion of the rotating impeller finishes passing the tongue portion, the tongue portion The sound pressure generated when the pressure suddenly drops around the periphery and each blade passes through the tongue and repeats a sudden increase and decrease in pressure around the tongue contributes to the noise generated by the rotation of the impeller. . An object of this invention is to reduce the noise which arises by rotation of an impeller in a volute in a ventilation working machine.

上記課題を解決するために、本発明は、内周部に渦形の送風路が形成され、渦形の送風路の中心軸の軸方向の少なくとも一方に吸気開口部が形成された本体部と、本体部の外周部にて渦形の送風路が内部に連続した状態で形成されて、吸気開口部からから吸い込んだ空気を噴出させる噴出筒部とを有したボリュートと、渦形の送風路の中心軸と平行な回転軸を有して、ボリュートの本体部内に回転可能に設けられた回転基板と、回転基板に回転軸の軸方向に突出するよう設けられ、回転基板の周方向に間隔を介して配置された複数の羽根部を有し、吸気開口部から吸い込んだ空気を遠心方向に噴き出すことで本体部内の渦形の送風路で昇圧させて噴出筒部から噴出させる羽根車と、羽根車を回転させる原動機とを備えた送風作業機であって、ボリュートの本体部内の羽根車の風が吹き出る位置と対向する位置には渦形の送風路の最も上流となる位置から風の流れる方向と逆向きに送風路に沿って延びる舌部を形成し、舌部の渦形の送風路に沿った方向の長さを羽根車の複数の羽根部の各間隔の２倍〜３倍の長さとするとともに、舌部における渦形の送風路の中心軸の軸方向の長さを風の上流側に進むにつれて短くなるように傾斜させたことを特徴とする送風作業機を提供するものである。   In order to solve the above problems, the present invention provides a main body portion in which a spiral air passage is formed in an inner peripheral portion, and an intake opening is formed in at least one of the axial directions of the central axis of the spiral air passage. A volute having a vortex-shaped air passage formed in the outer peripheral portion of the main body portion in a continuous state inside the main body, and having a blow-out cylindrical portion for ejecting air sucked from the intake opening, and a vortex-shaped air passage A rotary substrate that is rotatably provided in the main body of the volute and has a rotation axis that is parallel to the central axis of the volute, and is provided on the rotary substrate so as to protrude in the axial direction of the rotary shaft, and is spaced in the circumferential direction of the rotary substrate An impeller that has a plurality of blade portions disposed through the air intake opening, and injects the air sucked from the intake opening in the centrifugal direction to increase the pressure in the vortex-shaped air passage in the main body portion to be ejected from the ejection cylinder portion; A blower working machine including a prime mover for rotating an impeller, At the position facing the position where the wind of the impeller in the main body of the lute blows, a tongue is formed that extends along the air flow path in the direction opposite to the direction of the wind flow from the most upstream position of the spiral air flow path, The length of the tongue in the direction along the vortex-shaped air passage is set to be twice to three times the interval between the plurality of blade portions of the impeller, and the central axis of the vortex-shaped air passage in the tongue It is an object of the present invention to provide a blower working machine characterized in that the length in the axial direction is inclined so as to become shorter as it goes upstream of the wind.

上記のように構成した送風作業機においては、ボリュートの本体部内で回転する羽根車の羽根部は傾斜した舌部を通過するので、羽根部が舌部を通過するときに、舌部周辺で圧力が急激に上昇及び下降をしないようになるとともに、２〜４つの羽根部が舌部を常に通過するために、舌部周辺での圧力の変動を少なくすることができ、羽根車の回転により生じる騒音を低減させることができるようになった。このように構成した送風作業機においては、舌部の送風路に沿った方向の長さを羽根車の回転軸の軸方向における舌部の最も長い部分での長さより２倍以上とするのが好ましい形状である。   In the blower working machine configured as described above, since the blade portion of the impeller that rotates in the main body portion of the volute passes through the inclined tongue portion, when the blade portion passes through the tongue portion, pressure is applied around the tongue portion. Will not rise and fall suddenly, and since 2 to 4 blades always pass through the tongue, fluctuations in pressure around the tongue can be reduced, resulting from rotation of the impeller Noise can be reduced. In the blower working machine configured as described above, the length of the tongue portion in the direction along the air passage is at least twice as long as the length of the longest portion of the tongue portion in the axial direction of the rotating shaft of the impeller. Preferred shape.

上記のように構成した送風作業機においては 羽根車の回転軸の軸方向における舌部の最も長い部分で羽根車の羽根部の回転軸の軸方向の長さの半分より長く延出させるのが好ましい   In the blower working machine configured as described above, the longest portion of the tongue portion in the axial direction of the rotating shaft of the impeller extends longer than half the axial length of the rotating shaft of the impeller blade portion. preferable

本発明の背負式ブロワの斜め後方から見た斜視図である。It is the perspective view seen from the slanting back of the backpack type blower of the present invention. ボリュートの正面図である。It is a front view of a volute. ボリュートの前側部を取り外して内部が見えるようにした斜視図である。It is the perspective view which removed the front side part of the volute and made the inside visible. 図２のＡ−Ａ線の断面図である。It is sectional drawing of the AA line of FIG. 舌部の周辺の圧力の変動を記したグラフであり、従来技術の舌部の周辺の圧力の変動を記したグラフ（ａ）と、本発明の舌部の周辺の圧力の変動を記したグラフ（ｂ）。It is the graph which described the fluctuation | variation of the pressure around the tongue part, The graph (a) which described the fluctuation | variation of the pressure around the tongue part of a prior art, and the graph which described the fluctuation | variation of the pressure around the tongue part of this invention (B).

以下、本発明の送風作業機の一実施形態である背負式ブロワの実施形態を添付図面を参照して説明する。図１に示したように、背負式ブロワ１０は、作業者が背負う背負フレーム１１と、背負フレーム１１に搭載したボリュート２０と、ボリュート２０内に回転可能に設けた羽根車２４と、羽根車２４を回転させる原動機２５とを備えている。   Hereinafter, an embodiment of a back blower which is an embodiment of a blower working machine of the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1, the back blower 10 includes a back frame 11 carried by an operator, a volute 20 mounted on the back frame 11, an impeller 24 rotatably provided in the volute 20, and an impeller 24. And a prime mover 25 that rotates the motor.

背負フレーム１１は作業者がボリュート２０と原動機２５とを背負って運ぶためのものである。背負フレーム１１は、作業者の背中に沿って配置される背板部１２と、背板部１２の下端から後方に延びる台座部１３とからなり、側面から見た形状がＬ字形をしている。背負フレーム１１の台座部１３には前側にボリュート２０が搭載されている。ボリュート２０の後側には原動機２５が一体的に組み付けられており、原動機２５はボリュート２０を介して背負フレーム１１に搭載されている。   The backpack frame 11 is for an operator to carry the volute 20 and the prime mover 25 on the back. The back frame 11 is composed of a back plate portion 12 arranged along the operator's back and a pedestal portion 13 extending rearward from the lower end of the back plate portion 12, and the shape seen from the side surface is L-shaped. . A volute 20 is mounted on the pedestal 13 of the back frame 11 on the front side. A prime mover 25 is integrally assembled on the rear side of the volute 20, and the prime mover 25 is mounted on the back frame 11 via the volute 20.

図２及び図３に示したように、ボリュート２０は羽根車２４を内部に設けた本体部２１と、本体部２１の右側部に一体的に設けた噴出筒部２２とを備えている。図３に示したように、この実施形態のボリュート２０は後側部２０ａと、前側部２０ｂとからなり、これら前後側部２０ａ，２０ｂをねじによって互いに一体的に組み付けたものである。本体部２１の内周部には前後方向に延びる中心軸Ｃを中心とした渦形の送風路２１ａが形成されており、本体部２１の前側には空気を吸い込むための吸気開口部２１ｂが形成されている。本体部２１内の渦形の送風路２１ａは右側部の上下方向の中間部から始まり、本体部２１の内周部にて前側から見て反時計回りに渦形となるように徐々に広く形成されている。吸気開口部２１ｂは本体部２１の渦形の送風路２１ａの渦の中心軸Ｃの軸方向の一方となる本体部２１の前側に形成されている。本体部２１の右側部に一体的に形成された噴出筒部２２にも送風路２２ａが形成されており、噴出筒部２２の送風路２２ａは本体部２１の渦形の送風路２１ａと連続して形成されている。噴出筒部２２には送風管２３が連通接続されており、噴出筒部２２から噴き出された空気は送風管２３によって地面に導かれるようになっている。   As shown in FIGS. 2 and 3, the volute 20 includes a main body 21 having an impeller 24 therein, and a jet cylinder 22 integrally provided on the right side of the main body 21. As shown in FIG. 3, the volute 20 of this embodiment includes a rear side portion 20a and a front side portion 20b, and these front and rear side portions 20a and 20b are integrally assembled with each other by screws. A spiral air passage 21 a centering on a central axis C extending in the front-rear direction is formed on the inner peripheral portion of the main body 21, and an intake opening 21 b for sucking air is formed on the front side of the main body 21. Has been. The spiral air passage 21a in the main body 21 starts from the middle portion of the right side in the up-down direction, and is gradually formed so as to form a spiral in the counterclockwise direction when viewed from the front side at the inner periphery of the main body 21. Has been. The intake opening 21 b is formed on the front side of the main body 21 that is one side in the axial direction of the central axis C of the vortex of the spiral air passage 21 a of the main body 21. An air blowing path 22 a is also formed in the ejection cylinder part 22 formed integrally with the right side part of the main body part 21, and the air blowing path 22 a of the ejection cylinder part 22 is continuous with the spiral air path 21 a of the main body part 21. Is formed. A blower pipe 23 is connected to the ejection cylinder part 22 so that air blown from the ejection cylinder part 22 is guided to the ground by the blower pipe 23.

図３に示したように、ボリュート２０の本体部２１内には羽根車２４が回転可能に設けられており、ボリュート２０の本体部２１の後側には羽根車２４を回転させる原動機２５が組み付けられている。羽根車２４はボリュート２０の本体部２１の渦形の送風路２１ａの中心軸Ｃと同軸的（平行）な回転軸ＡＸを有した円形の回転基板２４ａと、回転基板２４ａの前面に設けられた複数の羽根部２４ｂと、羽根部２４ｂの前側にて円環形の側板２４ｃとを有したクローズ式の羽根車である。回転基板２４ａの前面には回転軸ＡＸの軸方向となる前側に突出する複数の羽根部２４ｂが設けられており、これら複数の羽根部２４ｂは回転基板２４ａの回転方向（周方向）に互いに間隔を介して配置されている。複数の羽根部２４ｂの間隔は等間隔に配置されたものであってもよいし、不等間隔に配置されたものであってもよい。   As shown in FIG. 3, an impeller 24 is rotatably provided in the main body portion 21 of the volute 20, and a prime mover 25 that rotates the impeller 24 is assembled to the rear side of the main body portion 21 of the volute 20. It has been. The impeller 24 is provided on a front surface of the rotary substrate 24a and a circular rotary substrate 24a having a rotation axis AX that is coaxial (parallel) with the central axis C of the spiral air passage 21a of the main body 21 of the volute 20. It is a closed impeller having a plurality of blade portions 24b and an annular side plate 24c on the front side of the blade portions 24b. A plurality of blade portions 24b projecting forward in the axial direction of the rotation axis AX are provided on the front surface of the rotation substrate 24a, and the plurality of blade portions 24b are spaced from each other in the rotation direction (circumferential direction) of the rotation substrate 24a. Is arranged through. The intervals between the plurality of blade portions 24b may be arranged at regular intervals, or may be arranged at irregular intervals.

原動機２５は内燃機関のエンジンを用いたものであり、原動機２５の駆動によって回転する駆動軸（図示省略）にはボリュート２０の本体部２１内に突出して羽根車２４が固定されている。原動機２５を駆動させると、羽根車２４がボリュート２０の本体部２１内で回転する。羽根車２４がボリュート２０内で回転すると、ボリュート２０の本体部２１の前側の吸気開口部２１ｂから吸い込まれた空気が回転する各羽根部２４ｂにより羽根車２４の周部から遠心方向に噴き出され、噴き出された空気は渦形の送風路２１ａにより昇圧されて噴出筒部２２の送風路２２ａに送られ、噴出筒部２２から噴き出された空気は送風管２３を通って地面に噴き出される。   The prime mover 25 uses an engine of an internal combustion engine. A drive shaft (not shown) that rotates by driving the prime mover 25 protrudes into the main body 21 of the volute 20 and an impeller 24 is fixed thereto. When the prime mover 25 is driven, the impeller 24 rotates in the main body 21 of the volute 20. When the impeller 24 rotates in the volute 20, the air sucked from the intake opening 21 b on the front side of the main body 21 of the volute 20 is ejected from the peripheral portion of the impeller 24 in the centrifugal direction by the rotating vane portions 24 b. The blown air is pressurized by the vortex-shaped air passage 21a and sent to the air passage 22a of the ejection cylinder portion 22, and the air ejected from the ejection cylinder portion 22 is ejected to the ground through the air duct 23. It is.

図３及び図４に示したように、ボリュート２０の本体部２１内には送風路２１ａの最も上流となる位置と送風路２１ａの下流部との間に舌部２１ｃが設けられており、舌部２１ｃは送風路２１ａの最も上流となる位置から風の流れる方向と逆向きに送風路２１ａに沿って延びている。舌部２１ｃは羽根車２４の風の吹き出る位置と対向する位置に形成されている。舌部２１ｃは送風路２１ａに沿った方向の長さが羽根車２４の複数の羽根部２４ｂの間隔より長く形成されている。具体的には、舌部２１ｃの送風路２１ａに沿った方向の長さは複数の羽根部２４ｂの間隔の２倍の長さとなっており、回転する羽根車２４の２つの羽根部２４ｂが必ず同時に舌部２１ｃを通過するようになっている。舌部２１ｃの前後方向の長さ（羽根車２４の回転軸ＡＸの軸方向の長さ）は送風路２１ａに沿った方向にて風の上流側に進むにつれて短くなるように傾斜している。舌部２１ｃの送風路２１ａに沿った方向の長さは舌部２１ｃの前後方向の長さ（渦形の送風路２１ａの中心軸Ｃの軸方向の長さ）の最も長い部分よりも２倍以上の長さとなっている。また、舌部２１ｃにおける渦形の送風路２１ａの中心軸Ｃの軸方向で最も長い部分を、羽根車２４の羽根部２４ｂにおける回転軸ＡＸの軸方向の長さの半分より長い位置まで延出している。舌部２１ｃはボリュート２０の後側部２０ａに一体的に形成されており、舌部２１ｃの前後方向で最も長く延びた部分はボリュート２０の前側部２０ｂの内周面に当接している。   As shown in FIGS. 3 and 4, a tongue portion 21c is provided in the main body portion 21 of the volute 20 between a position upstream of the air passage 21a and a downstream portion of the air passage 21a. The portion 21c extends along the air passage 21a from the position upstream of the air passage 21a in the direction opposite to the flow direction of the wind. The tongue portion 21c is formed at a position facing the position where the wind of the impeller 24 blows out. The tongue portion 21 c is formed such that the length in the direction along the air passage 21 a is longer than the interval between the plurality of blade portions 24 b of the impeller 24. Specifically, the length of the tongue portion 21c in the direction along the air passage 21a is twice the interval between the plurality of blade portions 24b, and the two blade portions 24b of the rotating impeller 24 must At the same time, the tongue 21c is passed. The length of the tongue portion 21c in the front-rear direction (the length in the axial direction of the rotation axis AX of the impeller 24) is inclined so as to become shorter in the direction along the air passage 21a toward the upstream side of the wind. The length of the tongue portion 21c in the direction along the air passage 21a is twice as long as the length of the tongue portion 21c in the front-rear direction (the length in the axial direction of the central axis C of the spiral air passage 21a). This is the length. Further, the longest portion in the axial direction of the central axis C of the spiral air passage 21a in the tongue portion 21c extends to a position longer than half of the axial length of the rotation axis AX in the blade portion 24b of the impeller 24. ing. The tongue portion 21c is formed integrally with the rear side portion 20a of the volute 20, and the longest extending portion in the front-rear direction of the tongue portion 21c is in contact with the inner peripheral surface of the front side portion 20b of the volute 20.

上記のように構成した背負式ブロワ１０の作動について説明する。原動機２５を駆動させると羽根車２４が回転し、ボリュート２０の本体部２１の前側の吸気開口部２１ｂから吸い込まれた空気が回転する各羽根部２４ｂによって羽根車２４の周部から遠心方向に噴き出され、噴き出された空気は渦形の送風路２１ａで昇圧されて噴出筒部２２に送られ、噴出筒部２２から噴き出された空気は送風管２３を通って地面に噴き出される。作業者が送風管２３のグリップ２３ａを把持して先端開口を作業者の前側で左右に回動させると、地面に広範囲に散る落葉等が吹き集められる。   The operation of the backpack type blower 10 configured as described above will be described. When the prime mover 25 is driven, the impeller 24 rotates, and air sucked from the intake opening 21b on the front side of the main body 21 of the volute 20 is spouted from the peripheral portion of the impeller 24 in the centrifugal direction by the rotating blade portions 24b. The air that has been ejected and blown out is pressurized by the vortex-shaped air passage 21 a and sent to the ejection cylinder portion 22, and the air ejected from the ejection cylinder portion 22 is ejected to the ground through the air duct 23. When the operator grips the grip 23a of the blower tube 23 and rotates the tip opening left and right on the front side of the operator, fallen leaves scattered over a wide area are blown and collected.

この背負式ブロワ１０においては、ボリュート２０の本体部２１内の羽根車２４の風が吹き出る位置（周部）と対向する位置には、本体部２１の送風路２１ａの最も上流となる位置から風の流れる方向と逆向きに送風路２１ａに沿って延びる舌部２１ｃが形成されている。この舌部２１ｃの送風路２１ａに沿った方向の長さは羽根車２４の複数の羽根部２４ｂの各間隔の２倍の長さとするとともに、舌部２１ｃの前後方向の長さ（舌部２１ｃにおける渦形の送風路２１ａの中心軸Ｃの軸方向の長さ）を風の上流側に進むにつれて短くなるように傾斜させている。   In the back blower 10, the wind blows from the position upstream of the air passage 21 a of the main body 21 to the position facing the position (circumferential part) of the impeller 24 in the main body 21 of the volute 20. A tongue portion 21c extending along the air passage 21a in the direction opposite to the direction in which the air flows is formed. The length of the tongue portion 21c in the direction along the air passage 21a is twice as long as each interval between the plurality of blade portions 24b of the impeller 24, and the length of the tongue portion 21c in the front-rear direction (the tongue portion 21c). In the direction of the axis of the central axis C of the vortex-shaped air passage 21a is inclined so as to become shorter toward the upstream side of the wind.

従来の背負式ブロワのボリュートの本体部内で羽根車を回転させたときには、図５（ａ）に示したように、羽根車の羽根部が舌部を通過するときに、舌部の周辺で圧力が急激に上昇と下降とをし、複数の羽根部が舌部を連続して通過する度に、舌部の周辺で圧力が急激に上昇と下降とを繰り返すことによって生じる音波による騒音が発生していた。   When the impeller is rotated within the main body of the volute of the conventional backpack blower, as shown in FIG. 5 (a), when the impeller blade passes through the tongue, pressure is applied around the tongue. Suddenly rises and falls, and every time multiple blades pass through the tongue continuously, noise caused by sound waves generated by the rapid rise and fall of pressure around the tongue occurs. It was.

これに対し、本発明の背負式ブロワ１０のボリュート２０の本体部２１内で羽根車２４を回転させたときには、舌部２１ｃが風の上流側に進むにつれて前後方向に短くなるように傾斜している。図５（ｂ）に示したように、羽根車２４の羽根部２４ｂが舌部２１ｃを通過する時間が長くなるため、舌部２１ｃの周辺で圧力が急激に上昇及び下降をしないようになり（各羽根部２４ｂが通過するときの圧力を１点鎖線で示し、隣り合う各羽根部２４ｂが通過するときの圧力の和を実線で示している）、舌部２１ｃの周辺で圧力が急激に上昇と下降とを繰り返すことによって生じる音波による騒音の発生を抑制することができるようになった。   In contrast, when the impeller 24 is rotated within the main body 21 of the volute 20 of the back blower 10 of the present invention, the tongue 21c is inclined so as to be shortened in the front-rear direction as it proceeds upstream of the wind. Yes. As shown in FIG. 5B, since the time for the blade 24b of the impeller 24 to pass through the tongue 21c becomes longer, the pressure does not increase and decrease rapidly around the tongue 21c ( The pressure when each blade 24b passes is indicated by a one-dot chain line, and the sum of the pressure when each adjacent blade 24b passes is indicated by a solid line), and the pressure rapidly increases around the tongue 21c. It is possible to suppress the generation of noise due to sound waves caused by repeating and descending.

また、舌部２１ｃの送風路２１ａに沿った方向の長さを羽根車２４の複数の羽根部２４ｂの間隔の２倍としている。このため、回転する羽根車２４の２つの羽根部２４ｂが必ず同時に舌部２１ｃを通過するようになり、舌部２１ｃの周辺で１つの羽根部２４ｂが通過した後に下降する圧力と次の羽根部２４ｂが通過するときに上昇する圧力とが重なり合うことで、舌部２１ｃの周辺での最低圧力を上昇させることができる。これによって、舌部２１ｃの周辺の最大圧力と最低圧力の変動ΔＰを小さくできるようになり、舌部２１ｃの周辺で圧力が急激に上昇と下降とを繰り返すことによって生じる騒音の発生を抑制することができた。なお、舌部２１ｃの送風路２１ａに沿った方向の長さは羽根車２４の複数の羽根部２４ｂの各間隔の２倍の長さとしたが、本発明はこれに限られるものでなく、舌部２１ｃの送風路２１ａに沿った方向の長さは羽根車２４の複数の羽根部２４ｂの各間隔の２〜３倍の長さとしたものであれば、羽根車２４から送風路２１ａに噴き出される風の出力をあまり低減させることなく騒音の発生を抑制することができる。また、羽根車２４の複数の羽根部２４ｂを周方向に不等間隔に配置したときには、羽根部２４ｂの最も間隔の大きいものを基準とするのが好ましい。   Further, the length of the tongue portion 21c in the direction along the air passage 21a is twice the interval between the plurality of blade portions 24b of the impeller 24. For this reason, the two blade portions 24b of the rotating impeller 24 always pass through the tongue portion 21c at the same time, and the pressure and the next blade portion descend after one blade portion 24b passes around the tongue portion 21c. The minimum pressure around the tongue 21c can be increased by overlapping the pressure that rises when 24b passes. As a result, the fluctuation ΔP between the maximum pressure and the minimum pressure around the tongue 21c can be reduced, and the generation of noise caused by the rapid increase and decrease in pressure around the tongue 21c can be suppressed. I was able to. The length of the tongue portion 21c in the direction along the air passage 21a is twice as long as each interval between the plurality of blade portions 24b of the impeller 24, but the present invention is not limited to this. If the length of the portion 21c in the direction along the air passage 21a is 2 to 3 times the interval between the plurality of blade portions 24b of the impeller 24, it is ejected from the impeller 24 to the air passage 21a. The generation of noise can be suppressed without significantly reducing the wind output. Moreover, when the several blade part 24b of the impeller 24 is arrange | positioned at an equal interval in the circumferential direction, it is preferable to make a reference | standard the thing with the largest space | interval of the blade part 24b.

上記の実施形態では、原動機２５は内燃機関のエンジンよりなるが、本発明はこれに限られるものでなく、原動機２５にバッテリや外部電源により駆動する電動モータを用いたものであってもよく、このようにしたときにも上述したのと同様の作用効果を得ることができる。   In the above embodiment, the prime mover 25 is an internal combustion engine. However, the present invention is not limited to this, and the prime mover 25 may be an electric motor driven by a battery or an external power source. Even in this case, the same effects as described above can be obtained.

また、送風作業機の一実施形態として背負式ブロワについて説明したが、本発明はこれに限られるものでなく、手持ち式のブロワにも適用されるものである。   Moreover, although a backpack type blower has been described as an embodiment of the blower working machine, the present invention is not limited to this and is also applied to a hand-held blower.

１０…送風作業機、２０…ボリュート、２１…本体部、２２…噴出筒部、２４…羽根車、２４ａ…回転基板、２４ｂ…羽根部、２５…原動機。 DESCRIPTION OF SYMBOLS 10 ... Blower working machine, 20 ... Volute, 21 ... Main-body part, 22 ... Jetting cylinder part, 24 ... Impeller, 24a ... Rotary substrate, 24b ... Blade | wing part, 25 ... Motor | power_engine.

Claims (3)

内周部に渦形の送風路が形成され、前記渦形の送風路の中心軸の軸方向の少なくとも一方に吸気開口部が形成された本体部と、前記本体部の外周部にて前記渦形の送風路が内部に連続した状態で形成されて、前記吸気開口部から吸い込んだ空気を噴出させる噴出筒部とを有したボリュートと、
前記渦形の送風路の中心軸と平行な回転軸を有して、前記ボリュートの本体部内に回転可能に設けられた回転基板と、前記回転基板に前記回転軸の軸方向に突出するよう設けられ、前記回転基板の回転方向に間隔を介して配置された複数の羽根部を有し、前記吸気開口部から吸い込んだ空気を遠心方向に噴き出すことで前記本体部内の渦形の送風路で昇圧させて前記噴出筒部から噴出させる羽根車と、
前記羽根車を回転させる原動機とを備えた送風作業機であって、
前記ボリュートの本体部内の前記羽根車の風が吹き出る位置と対向する位置には前記渦形の送風路の最も上流となる位置から風の流れる方向と逆向きに前記送風路に沿って延びる舌部を形成し、
前記舌部の前記渦形の送風路に沿った方向の長さを前記羽根車の複数の羽根部の各間隔の２〜３倍の長さとするとともに、前記舌部における前記渦形の送風路の中心軸の軸方向の長さを風の上流側に進むにつれて短くなるように傾斜させたことを特徴とする送風作業機。 A body portion having a spiral air passage formed in an inner peripheral portion and an intake opening formed in at least one of the axial directions of the central axis of the spiral air passage, and the vortex at the outer peripheral portion of the body portion A volute having an air blowing channel formed in a continuous state inside, and having an ejection cylinder portion for ejecting air sucked from the intake opening;
A rotating substrate having a rotation axis parallel to the central axis of the vortex-shaped air passage and rotatably provided in the main body of the volute, and provided on the rotating substrate so as to protrude in the axial direction of the rotation shaft A plurality of blades arranged at intervals in the rotation direction of the rotating substrate, and the air sucked from the intake opening is blown out in the centrifugal direction to boost the pressure in a vortex-shaped air passage in the main body An impeller to be ejected from the ejection cylinder,
A blower working machine comprising a prime mover for rotating the impeller,
A tongue portion extending along the air flow path in a direction opposite to the wind flow direction from a position upstream of the swirl-shaped air flow path at a position opposite to the position where the wind of the impeller blows out in the main body of the volute. Form the
The length of the tongue portion in the direction along the spiral air passage is two to three times as long as each interval between the plurality of blade portions of the impeller, and the spiral air passage in the tongue portion. A blower working machine characterized in that the axial length of the central axis of the fan is inclined so as to become shorter as it goes upstream of the wind. 請求項１に記載の送風作業機において、
前記舌部の前記渦形の送風路に沿った方向の長さを前記渦形の送風路の中心軸の軸方向の最も長い部分での長さより２倍以上としたことを特徴とする送風作業機。 The blower working machine according to claim 1,
The length of the tongue portion in the direction along the spiral air passage is set to be twice or more than the length of the longest portion in the axial direction of the central axis of the spiral air passage. Machine. 請求項１または２に記載の送風作業機において、
前記舌部における前記渦形の送風路の中心軸の軸方向で最も長い部分を、前記羽根車の羽根部における前記回転軸の軸方向の長さの半分より長い位置まで延出させたことを特徴とする送風作業機。 The blower working machine according to claim 1 or 2,
The longest portion in the axial direction of the central axis of the spiral air passage in the tongue is extended to a position longer than half of the axial length of the rotary shaft in the blade portion of the impeller. Blower working machine.
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JP2015083816A (en) * 2013-10-25 2015-04-30 株式会社マキタ Backpack type blower
JP2015215983A (en) * 2014-05-08 2015-12-03 株式会社マキタ Powered working machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114440316A (en) * 2022-01-30 2022-05-06 广东美的暖通设备有限公司 Air duct assembly and air conditioning equipment with same
WO2023142932A1 (en) * 2022-01-30 2023-08-03 广东美的暖通设备有限公司 Air channel assembly and air conditioning device having same
CN114440316B (en) * 2022-01-30 2024-02-27 广东美的暖通设备有限公司 Air duct assembly and air conditioning equipment with same

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JP6727006B2 (en) 2020-07-22
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