JP2017096126A - Intake duct - Google Patents
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- JP2017096126A JP2017096126A JP2015227338A JP2015227338A JP2017096126A JP 2017096126 A JP2017096126 A JP 2017096126A JP 2015227338 A JP2015227338 A JP 2015227338A JP 2015227338 A JP2015227338 A JP 2015227338A JP 2017096126 A JP2017096126 A JP 2017096126A
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本発明は、吸気ダクトに関し、特に、吸気口の各部における風速を平均化できる吸気ダクトに関するものである。 The present invention relates to an air intake duct, and more particularly to an air intake duct that can average the wind speed at each part of an air inlet.
エンジンやモーター等の駆動源を備えた発電機では、作動時の騒音が機外へ漏出することを防止すると共に、屋外における使用時に風雨等に曝されることがないように、金属製の箱である防音箱内に構成機器を収容する。このような発電機では、防音箱内に冷却ファンを配置すると共に、防音箱の側壁に吸気口を開口形成し、冷却ファンの回転により防音箱内を負圧とすることで、吸気口から内部空間へ外気（吸入空気）を導入（吸入）して、構成機器を冷却する。 For generators equipped with driving sources such as engines and motors, a metal box is used to prevent noise during operation from leaking out of the machine and to prevent exposure to wind and rain when used outdoors. The components are housed in a soundproof box. In such a generator, a cooling fan is arranged in the soundproof box, an air inlet is formed in the side wall of the soundproof box, and the inside of the soundproof box is made negative by rotation of the cooling fan. Air (intake air) is introduced (intake) into the space to cool the components.
この場合、防音箱の内面に吸気ダクトを設け、屈曲した流路を形成することで、吸気口から機外へ漏出しようとする騒音を遮断すると共に、雨水や塵芥が侵入することを防止する。ここで、図６を参照して、吸入空気の風速分布を解析した結果を説明する。図６（ａ）は、従来品の風速分布の解析結果であり、（ｂ）は、従来品の吸気口における風速分布の解析結果である。 In this case, an air intake duct is provided on the inner surface of the soundproof box to form a bent flow path, so that noise that leaks from the air inlet to the outside of the machine is blocked and rainwater and dust are prevented from entering. Here, the result of analyzing the wind speed distribution of the intake air will be described with reference to FIG. 6A shows the analysis result of the wind speed distribution of the conventional product, and FIG. 6B shows the analysis result of the wind speed distribution at the intake port of the conventional product.
図６に示すように、吸気口から吸入される吸入空気は、屈曲した流路の内側（吸気口における吹出口側の縁部）で風速が局所的に速くなる。そのため、防音箱の外壁を滴下した雨滴が吸気ダクト内に吸い込まれやすい。また、風速が局所的に速くされた空気流が壁（エアカーテン）を形成することで、吸気口（屈曲した流路の外側）からの吸入空気の吸入が制限され、吸気口断面積を有効利用できない。 As shown in FIG. 6, the intake air sucked from the intake port has a locally high wind speed inside the bent flow path (the edge on the outlet side of the intake port). Therefore, raindrops dripping on the outer wall of the soundproof box are easily sucked into the intake duct. In addition, the air flow with locally increased wind speed forms a wall (air curtain), which restricts intake air intake from the intake port (outside the bent flow path) and makes the intake cross-sectional area effective Not available.
これに対し、特許文献１には、吸気口の各部における風速を平均化することで、雨滴の吸い込みやエアカーテンの形成を抑制する技術が開示される。具体的には、吸気ダクト内に仕切り板を設け、流路を二分割することで、屈曲した流路の内側（吸気口における吹出口側の端部）で生じる局部的な風速の上昇を抑制する。 On the other hand, Patent Document 1 discloses a technique for suppressing the inhalation of raindrops and the formation of an air curtain by averaging the wind speed at each part of the air inlet. Specifically, a partition plate is provided in the intake duct and the flow path is divided into two to suppress the local increase in wind speed that occurs inside the bent flow path (the end on the outlet side of the intake port). To do.
しかしながら、上述した従来の技術であっても、吸気口の各部における風速を十分に平均化できないという問題点があった。そのため、雨滴の吸い込みやエアカーテンの形成を十分に抑制できなかった。 However, even with the above-described conventional technique, there is a problem in that the wind speed at each part of the intake port cannot be sufficiently averaged. For this reason, it has not been possible to sufficiently suppress the inhalation of raindrops and the formation of air curtains.
本発明は、上述した問題点を解決するためになされたものであり、吸気口の各部における風速を平均化できる吸気ダクトを提供することを目的としている。 The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an intake duct capable of averaging the wind speed at each part of the intake port.
この目的を達成するために、請求項１記載の吸気ダクトは、側壁に吸気口が開口形成される発電機用防音箱の前記側壁の内面に装着され、前記吸気口から内部空間へ導入される吸入空気の流路を形成するものであり、一辺側が前記側壁の内面に連結されると共に前記吸気口の全面に対峙されつつ他辺側が前記吸気口を越えて延設される背面板と、その背面板の側縁を前記側壁の内面に連結して前記背面板の他辺側が吹出口として開口される流路を前記背面板と共に形成する側連結板と、それら側連結板および背面板により形成される流路を複数の流路に分割する複数枚の仕切り板と、を備え、それら複数枚の仕切り板が、前記背面板に近い流路ほど分割幅が大きくなる位置にそれぞれ配置される。 In order to achieve this object, the air intake duct according to claim 1 is mounted on an inner surface of the side wall of the soundproof box for a generator having an air inlet formed in the side wall, and is introduced into the internal space from the air inlet. A back plate that forms a flow path for intake air, one side of which is connected to the inner surface of the side wall and that faces the entire surface of the intake port, and the other side extends beyond the intake port; A side connecting plate that connects the side edge of the back plate to the inner surface of the side wall and opens the other side of the back plate as a blower outlet together with the back plate, and is formed by the side connecting plate and the back plate A plurality of partition plates that divide the flow path into a plurality of flow paths, and each of the plurality of partition plates is disposed at a position where the split width becomes larger as the flow path is closer to the back plate.
請求項２記載の吸気ダクトは、請求項１記載の吸気ダクトにおいて、前記仕切り板は、一辺側が前記吸気口を臨むと共に、他辺側が前記吸気口を越えない位置まで延設される。 An intake duct according to a second aspect is the intake duct according to the first aspect, wherein the partition plate extends to a position where one side faces the intake port and the other side does not exceed the intake port.
請求項３記載の吸気ダクトは、請求項１又は２に記載の吸気ダクトにおいて、前記背面板と前記複数枚の仕切り板とがそれぞれ屈曲して形成されると共に、それら背面板の屈曲線と前記複数枚の仕切り板の屈曲線とがそれぞれ１の仮想平面上に位置する。 The intake duct according to claim 3 is the intake duct according to claim 1 or 2, wherein the back plate and the plurality of partition plates are respectively bent, and the bent line of the back plate and the Each of the bent lines of the plurality of partition plates is positioned on one virtual plane.
請求項４記載の吸気ダクトは、請求項１又は２に記載の吸気ダクトにおいて、前記複数枚の仕切り板がそれぞれ前記背面板と略平行な姿勢で配設される。 An intake duct according to a fourth aspect is the intake duct according to the first or second aspect, wherein the plurality of partition plates are respectively arranged in a posture substantially parallel to the back plate.
請求項１記載の吸気ダクトによれば、側連結板および背面板により形成される流路を複数の流路に分割する複数枚の仕切り板を備え、それら複数枚の仕切り板が、背面板に近い流路ほど分割幅が大きくなる位置にそれぞれ配置されるので、分割された各流路における風速を平均化して、吸気口の各部における風速を平均化できる。その結果、雨滴の吸い込みやエアカーテンの形成を抑制できる。 According to the intake duct of claim 1, the air intake duct includes a plurality of partition plates that divide a flow path formed by the side connection plate and the back plate into a plurality of flow channels, and the plurality of partition plates are provided on the back plate. Since the closer flow paths are arranged at positions where the division width becomes larger, the wind speed in each divided flow path can be averaged, and the wind speed in each part of the intake port can be averaged. As a result, inhalation of raindrops and formation of an air curtain can be suppressed.
請求項２記載の吸気ダクトによれば、請求項１記載の吸気ダクトの奏する効果に加え、仕切り板を短くして、材料コストを低減できる。即ち、仕切り板の他辺側が吸気口を越えて延設される場合には、仕切り板が長くなり、材料コストが嵩むところ、仕切り板の他辺側が吸気口を越えないので、その分、材料コストを低減できる。 According to the intake duct of the second aspect, in addition to the effect produced by the intake duct of the first aspect, the partition plate can be shortened to reduce the material cost. In other words, when the other side of the partition plate extends beyond the intake port, the partition plate becomes longer and the material cost increases, and the other side of the partition plate does not exceed the intake port. Cost can be reduced.
なお、仕切り板の他辺側を、吸気口を越えない位置に配設することは、吸気ダクト内に設けた仕切り板で流路を二分割する従来技術では、不可能であり（即ち、分割された各流路で風速が異なるため、各流路を流通した吸入空気が合流する際に互いが干渉しあい吹出口への流通が妨げられる、或いは、エアカーテンが形成される）、本発明において、複数枚の仕切り板で流路を複数に分割すると共に、背面板に近い流路ほど分割幅を大きくすることで（即ち、分割された各流路の風速を平均化できたことで）、初めて可能となったものである。これにより、仕切り板の無駄な部分を省略して、その分、材料コストを低減できる。 In addition, it is impossible to arrange the other side of the partition plate at a position that does not exceed the intake port in the prior art in which the flow path is divided into two by the partition plate provided in the intake duct (that is, the division is not performed). In the present invention, since the wind speed is different in each flow path, the intake air that has flowed through each flow path interferes with each other and interferes with the flow to the outlet or an air curtain is formed) In addition to dividing the flow path into a plurality of partitions with a plurality of partition plates, and increasing the split width as the flow path is closer to the back plate (that is, by being able to average the wind speed of each divided flow path) This is possible for the first time. Thereby, the useless part of a partition plate is abbreviate | omitted, and material cost can be reduced by that much.
請求項３記載の吸気ダクトによれば、請求項１又は２に記載の吸気ダクトの奏する効果に加え、背面板と複数枚の仕切り板とがそれぞれ屈曲して形成されると共に、それら背面板の屈曲線と複数枚の仕切り板の屈曲線とがそれぞれ１の仮想平面上に位置するので、各流路の分割幅を吸入空気の流通方向に沿って一定とできる。これにより、分割された各流路における風速を平均化して、吸気口の各部における風速を平均化できる。 According to the intake duct according to claim 3, in addition to the effect of the intake duct according to claim 1 or 2, the back plate and the plurality of partition plates are formed by bending, respectively, Since the bending line and the bending lines of the plurality of partition plates are respectively located on one virtual plane, the division width of each flow path can be made constant along the flow direction of the intake air. Thereby, the wind speed in each division | segmentation flow path can be averaged, and the wind speed in each part of an inlet port can be averaged.
請求項４記載の吸気ダクトによれば、請求項１又は２に記載の吸気ダクトの奏する効果に加え、複数の仕切り板がそれぞれ背面板と略平行な姿勢で配設されるので、各流路の分割幅を吸入空気の流通方向に沿って一定とできる。これにより、分割された各流路における風速を平均化して、吸気口の各部における風速を平均化できる。 According to the intake duct of the fourth aspect, in addition to the effect of the intake duct according to the first or second aspect, each of the plurality of partition plates is disposed in a posture substantially parallel to the back plate. Can be made constant along the flow direction of the intake air. Thereby, the wind speed in each division | segmentation flow path can be averaged, and the wind speed in each part of an inlet port can be averaged.
以下、本発明の好ましい実施形態について、添付図面を参照して説明する。図１は、本発明の一実施形態における吸気ダクト２０が装着された発電機１の部分拡大斜視図である。また、図２（ａ）は、図１の矢印ＩＩａ方向視における発電機１の部分拡大正面図であり、図２（ｂ）は、図２（ａ）のＩＩｂ−ＩＩｂ線における発電機１の部分拡大断面図である。 Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a partially enlarged perspective view of a generator 1 fitted with an intake duct 20 according to an embodiment of the present invention. 2A is a partially enlarged front view of the generator 1 as viewed in the direction of arrow IIa in FIG. 1, and FIG. 2B is a diagram of the generator 1 taken along line IIb-IIb in FIG. It is a partial expanded sectional view.
なお、図１及び図２では、図面を簡素化して、理解を容易とするために、防音箱１０に対する吸気口１１ａ及び吸気ダクト２０の大きさが相対的に拡大されて模式的に図示される。 In FIGS. 1 and 2, the sizes of the intake port 11a and the intake duct 20 with respect to the soundproof box 10 are schematically enlarged to simplify the drawings and facilitate understanding. .
図１及び図２に示すように、発電機１は、エンジンや冷却ファンなどの構成機器（図示せず）を収容する箱状の防音箱１０と、その防音箱１０の側壁１１の内面に装着される吸気ダクト２０とを備える。防音箱１０には、側壁１１に正面視矩形の吸気口１１ａが開口形成され、吸気口１１ａ及び防音箱１０の内部空間へ導入される外気（吸入空気）の流路が吸気ダクト２０により形成される。なお、本実施形態では、発電機１が可搬式発電機として形成される。 As shown in FIGS. 1 and 2, the generator 1 is mounted on a box-shaped soundproof box 10 that houses components (not shown) such as an engine and a cooling fan, and an inner surface of a side wall 11 of the soundproof box 10. The intake duct 20 is provided. In the soundproof box 10, a rectangular air inlet 11 a is formed in the side wall 11 in a front view, and a flow path of outside air (intake air) introduced into the air inlet 11 a and the internal space of the soundproof box 10 is formed by the air intake duct 20. The In the present embodiment, the generator 1 is formed as a portable generator.
吸気ダクト２０は、背面板２１と、その背面板２１と共に流路を形成する一対の側連結板２２と、それら背面板２１及び側連結板２２により形成される流路を複数の流路に分割（本実施形態では三分割）する第１仕切り板２３及び第２仕切り板２４とを備える。 The intake duct 20 divides the flow path formed by the back plate 21, the pair of side connection plates 22 that form a flow path with the back plate 21, and the back plate 21 and the side connection plate 22 into a plurality of flow paths. A first partition plate 23 and a second partition plate 24 that are divided into three in this embodiment are provided.
背面板２１は、一辺２１ａが防音箱１０における側壁１１の内面に連結されると共に吸気口１１ａの全面に対峙されつつ他辺２１ｂ側が吸気口１１ａの内縁（一辺２１ａが連結される側と反対側の内縁）を越えて防音箱１０の天井壁１２へ向けて延設される。なお、本実施形態では、背面板２１の他辺２１ｂと防音箱１０の天井壁１２との間の距離が間隔Ｗ１に設定される。 The back plate 21 has one side 21a connected to the inner surface of the side wall 11 of the soundproof box 10 and is opposed to the entire surface of the air inlet 11a, while the other side 21b is the inner edge of the air inlet 11a (the side opposite to the side to which the side 21a is connected). Extending toward the ceiling wall 12 of the soundproof box 10. In the present embodiment, the distance between the other side 21b of the back plate 21 and the ceiling wall 12 of the soundproof box 10 is set to the interval W1.
背面板２１は、正面視縦長矩形の板を側面視くの字状に屈曲して形成され、他辺２１ｂ側の平板状部分が、防音箱１０の側壁１１と平行に延設される。なお、本実施形態では、背面板２１（他辺２１ｂ側の平板状部分）と防音箱１０の側壁１１との間の距離が間隔Ｗ２に設定され、背面板２１（一辺２１ａ側の平板状部分）と吸気口１１ａの内縁（背面板２１の一辺２１ａが連結される側と反対側の内縁）との間の距離が間隔Ｗ３に設定される。間隔Ｗ１及び間隔Ｗ３は、間隔Ｗ２と同等またはそれ以上の距離に設定される（Ｗ２≦Ｗ１、Ｗ２≦Ｗ３）。また、背面板２１の一辺２１ａ側の平板状部分と防音箱１０の側壁１１とのなる角度θ１がθ１＝６０°に設定される。 The back plate 21 is formed by bending a vertically long plate in front view into a letter-like shape when viewed from the side, and a flat plate portion on the other side 21 b side extends in parallel with the side wall 11 of the soundproof box 10. In this embodiment, the distance between the back plate 21 (the flat plate portion on the other side 21b side) and the side wall 11 of the soundproof box 10 is set to the interval W2, and the back plate 21 (the flat plate portion on the one side 21a side) is set. ) And the inner edge of the intake port 11a (the inner edge opposite to the side to which the one side 21a of the back plate 21 is connected) is set to the interval W3. The interval W1 and the interval W3 are set to a distance equal to or greater than the interval W2 (W2 ≦ W1, W2 ≦ W3). Further, an angle θ1 between the flat plate-like portion on the side 21a side of the back plate 21 and the side wall 11 of the soundproof box 10 is set to θ1 = 60 °.
側連結板２２は、背面板２１の両側の縁部（一辺２１ａと他辺２１ｂとを接続する側辺）をそれぞれ防音箱１０における側壁１１の内面に連結する。これにより、背面板２１及び側連結板２２と防音箱１０の側壁１１との間に、背面板２１の他辺２１ｂ側が吹出口として開口される流路（即ち、吸気口１１ａから導入された吸入空気を吹出口まで流通させる流路）が形成される。なお、一対の側連結板２２の対向間隔（図２（ａ）左右方向間隔）は、吸気口１１ａの幅寸法と同等に設定される。 The side connection plate 22 connects the edge portions (side sides connecting the one side 21 a and the other side 21 b) on both sides of the back plate 21 to the inner surface of the side wall 11 in the soundproof box 10. Thereby, between the back plate 21 and the side connection plate 22 and the side wall 11 of the soundproof box 10, the flow path in which the other side 21 b side of the back plate 21 is opened as an outlet (that is, the suction introduced from the intake port 11 a). A flow path through which air is circulated to the outlet is formed. In addition, the opposing space | interval (FIG. 2 (a) left-right direction space | interval) of a pair of side connection board 22 is set equivalent to the width dimension of the inlet port 11a.
上述したように、背面板２１及び側連結板２２により形成される流路内には、第１仕切り板２３及び第２仕切り板２４が配設され、これら第１仕切り板２３及び第２仕切り板２４によって流路が厚み方向（図２（ｂ）左右方向）に３分割される。ここで、図３を参照して、第１仕切り板２３及び第２仕切り板２４の詳細構成について説明する。 As described above, the first partition plate 23 and the second partition plate 24 are disposed in the flow path formed by the back plate 21 and the side connection plate 22, and the first partition plate 23 and the second partition plate are disposed. 24 divides the flow path into three in the thickness direction (left and right direction in FIG. 2B). Here, with reference to FIG. 3, the detailed structure of the 1st partition plate 23 and the 2nd partition plate 24 is demonstrated.
図３は、図２（ｂ）のＩＩＩ部における発電機１の部分拡大断面図である。なお、図３では、吸気ダクト２０を構成する各部材の板厚寸法が実際よりも大きくされて模式的に図示される。 FIG. 3 is a partially enlarged cross-sectional view of the generator 1 in the III part of FIG. In FIG. 3, the thickness of each member constituting the intake duct 20 is schematically illustrated as being larger than the actual thickness.
図３に示すように、第１仕切り板２３及び第２仕切り板２４は、背面板２１と略平行な姿勢で配設され、幅方向（図３紙面垂直方向）両側の縁部（側辺）が側連結板２２に連結される。詳細には、第１仕切り板２３及び第２仕切り板２４は、正面視縦長矩形の板を側面視くの字状に屈曲して形成され、一辺２３ａ，２４ａ側の平板状部分が背面板２１の一辺２１ａ側の平板状部分と、他辺２３ｂ，２４ｂ側の平板状部分が背面板２１の他辺２１ｂ側の平板状部分と、それぞれ平行に延設される。 As shown in FIG. 3, the first partition plate 23 and the second partition plate 24 are disposed in a posture substantially parallel to the back plate 21, and edges (sides) on both sides in the width direction (perpendicular to the paper surface of FIG. 3). Are connected to the side connecting plate 22. In detail, the first partition plate 23 and the second partition plate 24 are formed by bending a vertically long rectangular plate in a front view, and a flat plate portion on one side 23a, 24a side is a back plate 21. The flat plate-like portion on the one side 21a side and the flat plate-like portion on the other side 23b, 24b side extend in parallel with the flat plate-like portion on the other side 21b side of the back plate 21, respectively.
本実施形態では、防音箱１０の側壁１１（側壁１１の内面を含む仮想面）と第１仕切り板２３（他辺２３ｂ側の平板状部分）との間の距離が間隔Ｗ４に、第１仕切り板２３と第２仕切り板２４との間の距離が間隔Ｗ５に、第２仕切り板２４と背面板２１との間の距離が間隔Ｗ６に、それぞれ設定される。なお、間隔Ｗ４，Ｗ５，Ｗ６が、請求項１記載の流路の分割幅に対応する。 In the present embodiment, the distance between the side wall 11 of the soundproof box 10 (the virtual surface including the inner surface of the side wall 11) and the first partition plate 23 (the flat plate portion on the other side 23b side) is the interval W4. The distance between the plate 23 and the second partition plate 24 is set to the interval W5, and the distance between the second partition plate 24 and the back plate 21 is set to the interval W6. The intervals W4, W5, and W6 correspond to the division width of the flow path according to claim 1.
この場合、間隔Ｗ５は間隔Ｗ４よりも大きな距離に、間隔Ｗ６は間隔Ｗ５よりも大きな距離に、それぞれ設定される（Ｗ４＜Ｗ５＜Ｗ６）。よって、第１仕切り板２３及び第２仕切り板２４に３分割された流路は、背面板２１に近い側（即ち、屈曲外側）の流路ほど分割幅が大きくされる。これにより、３分割された各流路における風速を平均化して、吸気口１１ａの各部における風速を平均化できる。その結果、雨滴の吸い込みやエアカーテンの形成を抑制できる。 In this case, the interval W5 is set to a distance greater than the interval W4, and the interval W6 is set to a distance greater than the interval W5 (W4 <W5 <W6). Accordingly, the flow width of the flow path divided into the first partition plate 23 and the second partition plate 24 is increased as the flow path is closer to the back plate 21 (that is, the bent outer side). Thereby, the wind speed in each flow path divided into three can be averaged, and the wind speed in each part of the intake port 11a can be averaged. As a result, inhalation of raindrops and formation of an air curtain can be suppressed.
ここで、間隔Ｗ４，Ｗ５，Ｗ６は、Ｗ４：Ｗ５：Ｗ６＝１：Ｎ：Ｎ×Ｎ（１＜Ｎ）の関係式を満たすように設定される。本実施形態では、Ｎ＝１．１５とされる。但し、かかる関係式は一実施形態の例示であり、他の関係式を採用することは当然可能である。 Here, the intervals W4, W5, and W6 are set so as to satisfy the relational expression of W4: W5: W6 = 1: N: N × N (1 <N). In this embodiment, N = 1.15. However, such a relational expression is an example of one embodiment, and other relational expressions can naturally be adopted.
第１仕切り板２３及び第２仕切り板２４は、一辺２３ａ，２４ａ側が吸気口１１ａを臨むと共に、他辺２３ｂ，２４ｂ側が吸気口１１ａの内縁（背面板２１の一辺２１ａが連結される側と反対側の内縁）を越えない位置まで延設される。 As for the 1st partition plate 23 and the 2nd partition plate 24, while the one side 23a, 24a side faces the inlet port 11a, the other side 23b, 24b side is the inner edge of the inlet port 11a (the side opposite to the side where the one side 21a of the back plate 21 is connected). The inner edge of the side).
本実施形態では、他辺２３ｂ，２４ｂと吸気口１１ａの内縁（背面板２１の一辺２１ａが連結される側と反対側の内縁）との間の距離が間隔Ｗ７に設定される。よって、吸気口１１ａを正面視すると、吸気口１１ａの内縁よりも他辺２３ｂ，２４ｂが下方（背面板２１の一辺２１ａ側、図２（ａ）下側）に位置し、これらの間に間隔Ｗ７の隙間（空隙）が形成される。但し、間隔Ｗ７を設けず（即ち、距離を０として）、吸気口１１ａの内縁と他辺２３ｂ，２４ｂとを同じ位置（正面視において一致する位置）に配設しても良い。 In the present embodiment, the distance between the other sides 23b, 24b and the inner edge of the intake port 11a (the inner edge opposite to the side where the one side 21a of the back plate 21 is connected) is set to the interval W7. Therefore, when the intake port 11a is viewed from the front, the other sides 23b and 24b are located below the inner edge of the intake port 11a (on the side 21a side of the back plate 21, FIG. 2 (a) lower side), and there is a gap between them. A gap (void) of W7 is formed. However, the interval W7 may not be provided (that is, the distance is set to 0), and the inner edge of the intake port 11a and the other sides 23b and 24b may be arranged at the same position (a position that matches in front view).
このように、本実施形態では、第１仕切り板２３及び第２仕切り板２４の他辺２３ｂ，２４ｂが吸気口１１ａの内縁（背面板２１の一辺２１ａが連結される側と反対側の内縁）を越えないので、第１仕切り板２３及び第２仕切り板２４の長さを短くして、その分、材料コストを低減できる。 Thus, in the present embodiment, the other sides 23b, 24b of the first partition plate 23 and the second partition plate 24 are the inner edges of the intake port 11a (the inner edges on the side opposite to the side to which the one side 21a of the back plate 21 is connected). Therefore, the length of the first partition plate 23 and the second partition plate 24 can be shortened, and the material cost can be reduced accordingly.
なお、吸気ダクト内に設けた仕切り板で流路を二分割する従来技術では、仕切り板の他辺側を、吸気口を越えない位置に配設することは、不可能であり（即ち、分割された各流路で風速が異なるため、各流路を流通した吸入空気が合流する際に互いが干渉しあい吹出口への流通が妨げられる、或いは、エアカーテンが形成される）、本発明において、第１仕切り板２３及び第２仕切り板２４で流路を三分割すると共に、背面板２１に近い流路ほど分割幅を大きくすることで（即ち、分割された各流路の風速を平均化できたことで）、初めて可能となったものである。これにより、第１仕切り板２３及び第２仕切り板２４の無駄な部分（吸気口１１ａを越えて延設される部分）を省略して、その分、材料コストを低減できる。 In the prior art in which the flow path is divided into two by the partition plate provided in the intake duct, it is impossible to dispose the other side of the partition plate at a position not exceeding the intake port (that is, the split plate). In the present invention, since the wind speed is different in each flow path, the intake air that has flowed through each flow path interferes with each other and interferes with the flow to the outlet or an air curtain is formed) The flow path is divided into three parts by the first partition plate 23 and the second partition plate 24, and the flow width closer to the rear plate 21 is increased (that is, the wind speed of each divided flow path is averaged). It was possible for the first time. Thereby, the useless part (part extended beyond the inlet port 11a) of the 1st partition plate 23 and the 2nd partition plate 24 is abbreviate | omitted, and material cost can be reduced by that much.
第１仕切り板２３及び第２仕切り板２４の一辺２３ａ，２４ａは、防音箱１０の側壁１１（側壁１１の内面を含む仮想面）との間に距離を隔てて配設される。これにより、吸気口１１ａに配設される網状体（例えば、パンチングにより形成され複数の小孔を有するもの）との干渉を避けることができる。但し、一辺２３ａ，２４ａが吸気口１１ａ内に位置するものであっても良い。 One side 23a, 24a of the first partition plate 23 and the second partition plate 24 is disposed with a distance from the side wall 11 of the soundproof box 10 (a virtual surface including the inner surface of the side wall 11). Thereby, interference with the net-like body (for example, the one formed by punching and having a plurality of small holes) disposed in the intake port 11a can be avoided. However, the sides 23a and 24a may be located in the intake port 11a.
上述したように、背面板２１と第１仕切り板２３及び第２仕切り板２４とは、それぞれ側面視くの字状に屈曲して形成される。この場合、本実施形態では、背面板２１の屈曲線（一辺２１ａ側の平板状部分と他辺２１ｂ側の平板状部分とが交わる稜線）と、第１仕切り板２３の屈曲線（一辺２３ａ側の平板状部分と他辺２３ｂ側の平板状部分とが交わる稜線）と、第２仕切り板２４の屈曲線（一辺２４ａ側の平板状部分と他辺２４ｂ側の平板状部分とが交わる稜線）とが、それぞれ仮想平面Ｓ１上に位置される。 As described above, the back plate 21, the first partition plate 23, and the second partition plate 24 are each formed by bending in a letter shape when viewed from the side. In this case, in this embodiment, the bending line of the back plate 21 (the ridge line where the flat plate portion on the one side 21a side and the flat plate portion on the other side 21b side) and the bending line of the first partition plate 23 (the one side 23a side). ) And a bent line of the second partition plate 24 (ridge line where the flat part on one side 24a and the flat part on the other side 24b cross). Are positioned on the virtual plane S1.
これにより、第１仕切り板２３及び第２仕切り板２４により三分割された各流路の分割幅を吸入空気の流通方向（第１仕切り板２３及び第２仕切り板２４の延設方向）に沿って一定とできる。これにより、分割された各流路における風速を平均化して、吸気口１１ａの各部における風速を平均化できる。 Thereby, the division width of each flow path divided into three by the first partition plate 23 and the second partition plate 24 is set along the flow direction of the intake air (the extending direction of the first partition plate 23 and the second partition plate 24). Can be constant. Thereby, the wind speed in each divided | segmented flow path can be averaged, and the wind speed in each part of the inlet port 11a can be averaged.
次いで、図４及び図５を参照して、吸入空気の風速分布を解析した結果について説明する。 Next, the results of analyzing the wind speed distribution of the intake air will be described with reference to FIGS. 4 and 5.
図４（ａ）は、発明品の風速分布の解析結果であり、図４（ｂ）は、発明品の吸気口１１ａにおける風速分布の解析結果である。また、図５（ａ）は、比較品の分速分布の解析結果であり、図５（ｂ）は、比較品の吸気口における風速分布の解析結果である。 FIG. 4A shows the analysis result of the wind speed distribution of the inventive product, and FIG. 4B shows the analysis result of the wind speed distribution at the intake port 11a of the inventive product. 5A shows the analysis result of the partial speed distribution of the comparative product, and FIG. 5B shows the analysis result of the wind speed distribution at the intake port of the comparative product.
なお、図４（ａ）及び図５（ａ）の断面は、図２（ａ）のＩＩｂ―ＩＩｂ線における断面（中央縦断面）に対応し、図４（ｂ）及び図５（ｂ）は、図２（ａ）の部分拡大図に対応する。 4A and 5A correspond to the section (center longitudinal section) taken along the line IIb-IIb in FIG. 2A, and FIG. 4B and FIG. This corresponds to the partially enlarged view of FIG.
風速分布の解析は、発明品（図４参照）と比較品（図５参照）とに対して行った。発明品は、本実施形態における発電機１（即ち、防音箱１０に吸気ダクト２０が装着されたもの）である。比較品は、仕切り板の構成が異なる点を除き、その他の構成はそれぞれ発明品と同一とされる。 The analysis of the wind speed distribution was performed on the invention (see FIG. 4) and the comparative product (see FIG. 5). The invention is the generator 1 according to the present embodiment (that is, the soundproof box 10 with the intake duct 20 attached). The comparative product is the same as the product of the invention, except that the configuration of the partition plate is different.
ここで、比較品は、１枚の仕切り板により流路が二分割され、その仕切り板と背面板２１との間の距離（間隔）が、吸気口１１ａの内縁（背面板２１の一辺２１ａが連結される
側と反対側の内縁）との間の距離である間隔Ｗ３の半分とされる。よって、比較品は、流路が等間隔に二分割される。
Here, in the comparative product, the flow path is divided into two by one partition plate, and the distance (interval) between the partition plate and the back plate 21 is the inner edge of the intake port 11a (the one side 21a of the back plate 21 is The distance between the connected side and the inner edge on the opposite side is half of the interval W3. Therefore, in the comparative product, the flow path is divided into two at equal intervals.
また、比較品の仕切り板は、他辺側が吸気口１１ａの内縁（背面板２１の一辺２１ａが連結される側と反対側の内縁）を越えて延設される。この延設の長さは、背面板２１の他辺２１ｂが吸気口１１ａの内縁を越えて延設される長さの半分とされる。 Further, the comparative product partition plate is extended on the other side beyond the inner edge of the intake port 11a (the inner edge opposite to the side to which the one side 21a of the back plate 21 is connected). The length of this extension is half of the length that the other side 21b of the back plate 21 extends beyond the inner edge of the intake port 11a.
なお、図６は、仕切り板を備えない（省略される）点を除き、その他の構成は発明品と同一とされるもの（従来品）に対して風速分布を解析した結果である。ここでは、従来品の解析結果についての説明は省略する。 In addition, FIG. 6 is the result of having analyzed the wind speed distribution with respect to what is the same as an invention product (conventional product) except the point which does not have a partition plate (omitted). Here, the description of the analysis result of the conventional product is omitted.
図４及び図５に示すように、吸気口１１ａの内縁（背面板２１の一辺２１ａが連結される側と反対側の内縁、図４（ｂ）及び図５（ｂ）の上側の縁部）に沿う領域での風速の分布を比較すると、比較品では、１１．６ｍ／ｓを越える風速が上記内縁に沿って分布されるのに対し、発明品では、１０．７ｍ／ｓまでの風速とされ、局所的に風速が速くなる領域が形成されることが抑制できた。 As shown in FIGS. 4 and 5, the inner edge of the intake port 11a (the inner edge opposite to the side to which the one side 21a of the back plate 21 is connected, the upper edge in FIGS. 4B and 5B) When the wind speed distribution in the region along the line is compared, in the comparative product, the wind speed exceeding 11.6 m / s is distributed along the inner edge, whereas in the invention product, the wind speed is up to 10.7 m / s. Thus, the formation of a region where the wind speed is locally increased can be suppressed.
また、比較品では、吸気口１１ａの上半分（図５（ｂ）上側）に風速が低くされる領域（風速が４．５ｍ／ｓ以下とされる領域）が大きく分布するところ、発明品では、かかる風速（４．５ｍ／ｓ以下）の領域を略半分に低減させることができた。 In the comparative product, a region where the wind speed is lowered (region where the wind speed is 4.5 m / s or less) is widely distributed in the upper half of the intake port 11a (upper side in FIG. 5B). The region of such wind speed (4.5 m / s or less) could be reduced to almost half.
このように、発明品では、流路を、背面板２１に近い側の流路ほど分割幅が大きくなるように不等間隔に分割したことで、比較品と比較して、各流路における風速を平均化して、吸気口１１ａの各部における風速を平均化できることが確認された。その結果、雨滴の吸い込みを抑制できる。また、吸気口１１ａからの吸入空気の吸入をスムーズ化できる、即ち、吸気口１１ａの断面積を有効活用でき、風量を高めることができる。 As described above, in the product according to the invention, the flow path is divided at unequal intervals so that the flow width closer to the back plate 21 is larger, so that the wind speed in each flow path is larger than that of the comparative product. It was confirmed that the wind speed at each part of the intake port 11a can be averaged. As a result, inhalation of raindrops can be suppressed. Further, the intake air from the intake port 11a can be smoothly sucked, that is, the cross-sectional area of the intake port 11a can be effectively used, and the air volume can be increased.
以上、実施形態に基づき本発明を説明したが、本発明は上記実施形態に何ら限定されるものではなく、本発明の趣旨を逸脱しない範囲内で種々の改良変更が可能であることは容易に推察できるものである。 As described above, the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment, and various modifications and changes can be easily made without departing from the gist of the present invention. It can be guessed.
上記実施形態で挙げた構成間の距離（間隔）の関係は一例であり、他の関係を採用することは当然可能である。 The relationship of the distances (intervals) between the configurations described in the above embodiment is an example, and other relationships can naturally be adopted.
上記実施形態では、２枚の仕切り板（第１仕切り板２３及び第２仕切り板２４）により流路を三分割する場合を説明したが、必ずしもこれに限られるものではなく、背面板２１側の流路ほど分割幅が大きくされるものであれば、３枚以上の仕切り板により流路を四分割以上に分割しても良い。 In the above embodiment, the case where the flow path is divided into three parts by the two partition plates (the first partition plate 23 and the second partition plate 24) has been described. If the division width is increased as the flow path is increased, the flow path may be divided into four or more by three or more partition plates.
１０ 防音箱（発電機用防音箱）
１１ 側壁
１１ａ 吸気口
２０ 吸気ダクト
２１ 背面板
２２ 側連結板
２３ 第１仕切り板（仕切り板）
２４ 第２仕切り板（仕切り板）
２１ａ，２３ａ，２４ａ 一辺
２１ｂ，２３ｂ，２４ｂ 他辺
Ｗ４，Ｗ５，Ｗ６ 間隔（分割幅）
Ｓ１ 仮想平面
10 Soundproof box (soundproof box for generator)
11 Side wall 11a Intake port 20 Intake duct 21 Back plate 22 Side connecting plate 23 First partition plate (partition plate)
24 Second partition plate (partition plate)
21a, 23a, 24a One side 21b, 23b, 24b Other side W4, W5, W6 spacing (division width)
S1 virtual plane
Claims (4)
一辺側が前記側壁の内面に連結されると共に前記吸気口の全面に対峙されつつ他辺側が前記吸気口を越えて延設される背面板と、
その背面板の側縁を前記側壁の内面に連結して前記背面板の他辺側が吹出口として開口される流路を前記背面板と共に形成する側連結板と、
それら側連結板および背面板により形成される流路を複数の流路に分割する複数枚の仕切り板と、を備え、
それら複数枚の仕切り板が、前記背面板に近い流路ほど分割幅が大きくなる位置にそれぞれ配置されることを特徴とする吸気ダクト。 In the intake duct, which is attached to the inner surface of the side wall of the generator soundproof box whose opening is formed in the side wall and forms a flow path of the intake air introduced from the intake port into the internal space,
A back plate that is connected to the inner surface of the side wall on one side and is opposed to the entire surface of the air intake port while the other side extends beyond the air intake port;
A side connection plate that connects the side edge of the back plate to the inner surface of the side wall and forms a flow path with the back plate on the other side of the back plate as an outlet;
A plurality of partition plates that divide the flow path formed by the side connecting plate and the back plate into a plurality of flow paths, and
The air intake duct, wherein the plurality of partition plates are respectively arranged at positions where the division width becomes larger as the flow path is closer to the back plate.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4212659A (en) * | 1977-12-30 | 1980-07-15 | Fiat Veicoli Industriali S.P.A. | Air-intake devices for internal combustion engines |
| US5625172A (en) * | 1995-04-18 | 1997-04-29 | Caterpillar Inc. | Engine enclosure air inlet/discharge sound attenuator |
| JP2009002218A (en) * | 2007-06-21 | 2009-01-08 | Mitsubishi Motors Corp | Intake system of internal combustion engine |
| JP2009121409A (en) * | 2007-11-16 | 2009-06-04 | Hokuetsu Kogyo Co Ltd | Intake duct of soundproofing box |
| JP2014122573A (en) * | 2012-12-20 | 2014-07-03 | Hokuetsu Kogyo Co Ltd | Soundproof box of engine-drive type work machine |
| JP2015017504A (en) * | 2013-07-09 | 2015-01-29 | デンヨー株式会社 | Air intake duct for engine work machine |
-
2015
- 2015-11-20 JP JP2015227338A patent/JP6541551B2/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4212659A (en) * | 1977-12-30 | 1980-07-15 | Fiat Veicoli Industriali S.P.A. | Air-intake devices for internal combustion engines |
| US5625172A (en) * | 1995-04-18 | 1997-04-29 | Caterpillar Inc. | Engine enclosure air inlet/discharge sound attenuator |
| JP2009002218A (en) * | 2007-06-21 | 2009-01-08 | Mitsubishi Motors Corp | Intake system of internal combustion engine |
| JP2009121409A (en) * | 2007-11-16 | 2009-06-04 | Hokuetsu Kogyo Co Ltd | Intake duct of soundproofing box |
| JP2014122573A (en) * | 2012-12-20 | 2014-07-03 | Hokuetsu Kogyo Co Ltd | Soundproof box of engine-drive type work machine |
| JP2015017504A (en) * | 2013-07-09 | 2015-01-29 | デンヨー株式会社 | Air intake duct for engine work machine |
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| JP6541551B2 (en) | 2019-07-10 |
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