JP4526688B2 - Wind tube with sound absorbing material and method of manufacturing the same - Google Patents

Wind tube with sound absorbing material and method of manufacturing the same Download PDF

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JP4526688B2
JP4526688B2 JP2000337829A JP2000337829A JP4526688B2 JP 4526688 B2 JP4526688 B2 JP 4526688B2 JP 2000337829 A JP2000337829 A JP 2000337829A JP 2000337829 A JP2000337829 A JP 2000337829A JP 4526688 B2 JP4526688 B2 JP 4526688B2
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tube
absorbing material
sound absorbing
pipe
flange
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JP2002138829A (en
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敏 中澤
成浩 小野澤
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Husqvarna Zenoah Co Ltd
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Husqvarna Zenoah Co Ltd
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【０００１】
【発明の属する技術分野】
本発明は、空気等を通風する風管に吸音材を設け、通過する空気の騒音を低減する吸音材付風管及びその製造方法に関する。
【０００２】
【従来の技術】
従来、円筒管内を流れるブロワの空気、あるいはエンジンの排気等の騒音を低減するために、管の途中に消音装置を設けたものは各種見受けられる。その一例としては特許第２９６７３９０号公報（Ｕ．Ｓ．Pat.No. ５７１８０４５号）、特開平１０−１９０００号公報（Ｕ．Ｓ．Pat.No. ５８２１４７３号）、Ｕ．Ｓ．Pat.No. ４４２１２０２号に開示されたものがある。
【０００３】
第１例の特許第２９６７３９０号公報に開示されたものは、内燃機関の排気音を低減することを目的としている。図６に示すように、消音器５０は、多孔内管５１と多孔内管５１を囲む外管５２との間に形成された環状隙間にグラスウール等の吸音材５３を介装して構成している。多孔内管５１の前後端部５１ａ，５１ｂは中間部よりも大径となっている。外管５２の前後端部には、それぞれキャップ５５，５６の外周が溶接されている。多孔内管５１の内部に複数個のセパレータ板５４ａ，５４ｂ，５４ｃを設け、複数個の排気膨脹室Ｃ１，Ｃ２，Ｃ３，Ｃ４を形成した構成となっている。組み立てに際しては、セパレータ板５４ａ，５４ｂ，５４ｃを取着した多孔内管５１の外周に、バインダを塗布した所定の厚さの吸音材５３を巻き付け、図示しないしごきローラを用いてロール成形を施し、外管５２に挿入するようにしている。
【０００４】
第２例の特開平１０−１９０００号公報には、可搬式のブロワのブロワパイプ（本発明に係る風管に相当）に取り付けられた消音装置が開示されている。図７に示すように、消音装置６０は、ブロワパイプ６１の軸線方向に所定長さＬ１にわたって延びる拡径部６２を設け、この拡径部６２の内部に多数の消音孔６４を有するインナーパイプ６３を挿入し、挿入したインナーパイプ６３と拡径部６２との間に形成された環状隙間にウレタンフォームからなる消音材６５を介装した構成となっている。インナーパイプ６３は軸線方向に２分割された一対の薄板材よりなり、組み立てる際には、それぞれの外周に消音材６５を取着し、前記一対の薄板材を湾曲させてブロワパイプ６１の端部から挿入し、拡径部６２内に収納するようになっている。又、他の方法としては、図８に示すように、インナーパイプ６３を、ポリプロピレン等の適度の弾性を有する可撓性材料からなる螺旋状に巻いた形状に成形された帯材６６によって形成する。帯材６６には、多数の消音孔６４が設けられている。取付けの際には、先ずブロワパイプ６１の一端部から消音材６５を挿入し、拡径部６２に消音材６５を納める。次に、帯材６６を軸方向に引っ張ってその外径ｄ２をブロワパイプ６１の内径ｄ１よりも小さくし、ブロワパイプ６１に挿入した後、引っ張り力を解除して帯材６６の外径ｄ２を大きくし、拡径部６２に消音材６５を押圧して取付けるようにしている。
【０００５】
また、第３例のＵ．Ｓ．Pat.No. ４４２１２０２号に開示された騒音低減装置７０は図９の斜視図に示すように、外筒７１に両端部に一対のつば７２，７２を設けた内筒７３を挿入し、外筒７１と内筒７３との間に形成される環状隙間に吸音材７４を介装した構成となっている。一対のつば７２，７２は、外筒７０にネジ７５により締着されるようになっている。内筒７３は、撚り紐を編み目状に組み、かつ樹脂で固めたもので、多数の空隙を持っている。
【０００６】
【発明が解決しようとする課題】
しかしながら、上記構成においては以下のような問題点がある。
１）特許第２９６７３９０号公報に開示されたものにあっては、部品点数が多く、大型で構造が複雑であり、重量も重く、コストも高くなるという問題がある。
２）特開平１０−１９０００号公報に開示されたものにあっては、消音材６５を拡径部６２内に収納する作業が非常に面倒であり、さらにインナーパイプ６３を消音材６５の内部に挿入する必要がある。従って、組み立てが煩雑で、工数を要し、部品点数も多くてコストも高いという問題がある。
３）またＵ．Ｓ．Pat.No. ４４２１２０２号に開示されたものにあっては、部品点数が多く、構造が複雑で、組立てに多大の工数を要し、コストも高くなるという問題がある。
【０００７】
本発明は上記の問題点に着目し、軽量であり、構造が簡単で部品点数が少なく、製造容易でコストの安い吸音材付風管及びその製造方法を提供することを目的としている。
【０００８】
【課題を解決するための手段、作用及び効果】
上記目的を達成するために、本発明に係る吸音材付風管は、円筒形で、長手方向の所定長さの外周壁面部に複数個の貫通穴を有し、内部に空気等を通風する内管と、貫通穴部を覆う外管と、内管と外管との間に介装された吸音材とよりなる吸音材付風管において、前記内管は、一側の先端部に設けられた回り止め用の突起部と、他側の端部近傍に設けられた、吸音材の外径より径の大きいフランジ部と、フランジ部の外周部に設けられた環状凸部と、前記先端部とフランジ部との間の壁面部に設けられた複数個の貫通穴とを有し、前記外管は、前記内管の貫通穴を覆う拡径部と、拡径部の一側に設けられ、内管を嵌入させるとともに前記突起部に係合する溝部を有する嵌合部と、拡径部の他側に開口して設けられ、前記フランジ部を嵌入させる係合部と、この係合部の内周部に設けられ、フランジ部の環状凸部に係合する環状溝とを有する構成としている。
【０００９】
上記構成によれば、吸音材に内管を挿入し、これを外管に挿入して外管の嵌合部に内管の先端部を嵌入させ、突起部と溝部とを係合させるとともに、係合部にフランジ部を嵌入し、環状溝と環状凸部とを係合させている。これにより内管と外管とは結合され、容易に、簡単に吸音材付風管を構成できる。したがって、部品点数が少なく、構造簡単で、コストの安い吸音材付風管が得られる。しかも、内管と外管との間には回り止めが設けられているため相対回転することはなく、吸音材付風管に風管を接続する組立て作業をする場合、内管と外管とが相互回転することがないので、組立て作業がやり易い。
【００１０】
次に、本発明の吸音材付風管の製造方法においては、円筒形で、長手方向の所定長さの外周壁面部に複数個の貫通穴を有し、内部に空気を通す内管と、貫通穴部を覆う外管と、内管と外管との間に介装された吸音材とよりなる吸音材付風管の製造方法において、長手方向の端部近傍に吸音材の外径より径の大きいフランジ部を有し、フランジ部の外周部に環状凸部を備えた樹脂製の円筒状の内管を製作し、次に、この内管を円筒状の防音材に挿入し、次に、防音材を覆う拡径部と、拡径部の一側に設けられ、内管の先端部を嵌入させる嵌合部と、拡径部の他側に開口して設けられ、前記内管のフランジ部を嵌入させるとともに、フランジ部の環状凸部に係合する環状溝を内周部に有する係合部とを有する樹脂製の外管をブロー成形し、成形後、温度の高い所定時間内に防音材付の内管を挿入して嵌合部に内管の先端部を嵌入するとともに、係合部に内管のフランジ部を嵌入し、冷却後にフランジ部の環状凸部に係合部の環状溝を係合させる製造方法としている。
【００１１】
上記方法によれば、内管および外管は樹脂製であるため軽量である。また、組立段階において、吸音材に予め製作した内管を挿入し、外管をブロー成形した後、温度の高い所定時間内に内管を嵌入し、冷却後に内管のフランジ部と外管の係合部とを結合させるようにしているため、少ない部品点数と、少ない工数で組立可能であり、コストが安くなる。
【００１２】
【発明の実施の形態】
以下に、本発明の吸音材付風管の実施形態について図面を参照して詳述する。尚、本発明の適用機械例として可搬式ブロワを挙げて説明する。
【００１３】
まず図１により、本発明に係る吸音材付風管２０を備えた可搬式ブロワ１の概要構成を説明する。略Ｌ型のフレーム３上には、エンジン５により駆動されるブロワ４が搭載されている。ブロワ４の空気吐出口７にはエルボ１０が取着され、エルボ１０の先端部には可撓式チューブ１１を介して順次上流側風管１２、吸音材付風管２０及び下流側風管１３が接続され、先端部から風を噴出して枯葉等を吹き飛ばすようになっている。作業者は可搬式ブロワ１を背負い、前記風管１２，１３を把持して清掃作業を行う。
【００１４】
つぎに吸音材付風管２０の構造について説明する。図２は吸音材付風管２０の側面一部断面図である。図２において、吸音材付風管２０は、円筒状の内管２１と、内管２１を覆う円筒状の外管３０と、内管２１と外管３０との間に介装された円筒状の吸音材４０とから構成されている。吸音材付風管２０の一側は上流側風管１２に接続し、他側は下流側風管１３に接続している。図３は図２のＡ−Ａ矢視図であり、図４は図２のＢ−Ｂ矢視図であり、図５は吸音材付風管２０の構成を示す分解斜視図である。図２、図３、図４、図５において、内管２１の長手方向の一側の先端部２２には、一対の回り止め用の突起部２３，２３が設けられ、他端部には下流側風管１３に接続する下流側接続部２４が設けられている。下流側接続部２４には下流側風管１３との接続用突起２４ａが設けられている。また、下流側接続部２４の近傍には吸音材４０の外径Ｃより大きい外径Ｄを有するフランジ部２５が一体に形成され、その外周部には環状凸部２６が設けられている。そして、突起部２３とフランジ部２５との間の円筒面には複数個の貫通穴２７が設けられている。外管３０の吸音材４０を覆う拡径部３１の一端部には上流側風管１２に接続する上流側接続部３２が設けられ、拡径部３１と上流側接続部３２との間には内管２１の先端部２２を嵌入する嵌合部３３が設けられている。上流側接続部３２には上流側風管１２との接続用溝３２ａが設けられている。嵌合部３３には内管２１の先端部２２に設けられた突起部２３，２３に係合する一対の溝部３４，３４が設けられており、組立時には互いに係合して相互回転を防止するようになっている。拡径部３１の他側には開口して内管２１のフランジ部２５を嵌入させる係合部３５が設けられ、係合部３５の内周部にはフランジ部２５の環状凸部２６に係合する環状溝３６が設けられ、互いに係合して内管２１と外管３０とを結合している。内管２１と外管３０の拡径部３１とで構成される空間部には円筒状の吸音材４０が介装されている。
【００１５】
本実施形態では、一例として、環状凸部２６と環状溝３６とを３ヶ所設けているが、１ヶ所でも、２ヶ所でも、あるいは４ヶ所以上の複数箇所に設けても良い。
【００１６】
本発明の吸音材付風管２０は上記のような構成としたため、内管２１と外管３０とが相対回転したり、長手方向に伸縮することはない。また、管内を通過する空気の騒音は吸音材４０に吸収され、騒音は低減される。
【００１７】
次に製造方法について説明する。内管２１はＡＢＳ、ポリアミド等の樹脂で、インジェクション成形により製作される。外管３０はポリエチレン、ポリプロピレン、ポリアミド等の樹脂で、ブロー成形により製作される。組立に際しては、まず、内管２１を製作し、円筒状の吸音材４０に挿入する。つぎに外管３０をブロー成形し、温度の高い所定時間内（例えば成形後１０分以内）に吸音材４０付の内管２１を挿入し、内管２１の先端部２２を外管３０の嵌合部３３に嵌入するとともに突起部２３と溝部３４とを係合させる。同時に内管２１のフランジ部２５を外管３０の係合部３５に嵌入させる。外管３０はブロー成形後の、温度の高い所定時間内では硬化しておらず、弾力性が有るので、内管２１の環状凸部２６は係合部３５の環状溝３６を伸ばし広げて容易に嵌入することができる。そして、時間の経過と共に、外管３０は伸ばされた部分が収縮すると共に、冷却されて硬化し、係合部３５の環状溝３６は内管２１の環状凸部２６にしっかりと係合し、内管２１と外管３０とは結合される。外管３０の冷却は自然放熱により、冷却しても良いし、強制的に冷風を吹き付けて冷却を促進させても良い。
【００１８】
本発明の吸音材付風管及びその製造方法は上記のようにしたため、組立て作業がやりやすく、構造簡単で、部品点数が少なく、軽量であり、製作容易でコストの安い吸音材付風管が得られる。
【図面の簡単な説明】
【図１】本発明の吸音材付風管を備えた可搬式ブロワの斜視図である。
【図２】本発明の吸音材付風管の側面一部断面図である。
【図３】図２のＡ−Ａ矢視図である。
【図４】図２のＢ−Ｂ矢視図である。
【図５】本発明の吸音材付風管の分解斜視図である。
【図６】従来技術の第１例の吸音材付消音器の側面断面図である。
【図７】従来技術の第２例の吸音材付風管の側面断面図である。
【図８】従来技術の第２例の吸音材付風管のインナーパイプの側面図である。
【図９】従来技術の第３例の吸音材付風管の分解斜視図である。
【符号の説明】
１…可搬式ブロワ、１２…上流側風管、１３…下流側風管、２０…吸音材付風管、２１…内管、２２…先端部、２３…突起部、２５…フランジ部、２６…環状凸部、３０…外管、３１…拡径部、３３…嵌合部、３４…溝部、３５…係合部、３６…環状溝、４０…吸音材。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wind tube with a sound absorbing material that is provided with a sound absorbing material in a wind tube that passes air or the like and reduces noise of the passing air, and a manufacturing method thereof.
[0002]
[Prior art]
Conventionally, in order to reduce noise such as blower air flowing in a cylindrical tube or exhaust of an engine, various types of silencers are provided in the middle of the tube. Examples thereof include Japanese Patent No. 2967390 (US Pat. No. 5718045), Japanese Patent Application Laid-Open No. 10-19000 (US Pat. No. 582473), U.S. Pat. S. There is one disclosed in Pat. No. 4421202.
[0003]
The first example disclosed in Japanese Patent No. 2967390 is intended to reduce the exhaust noise of an internal combustion engine. As shown in FIG. 6, the silencer 50 is constructed by interposing a sound absorbing material 53 such as glass wool in an annular gap formed between the porous inner tube 51 and the outer tube 52 surrounding the porous inner tube 51. Yes. The front and rear end portions 51a and 51b of the porous inner tube 51 have a larger diameter than the intermediate portion. The outer circumferences of caps 55 and 56 are welded to the front and rear ends of the outer tube 52, respectively. A plurality of separator plates 54a, 54b, 54c are provided inside the porous inner tube 51, and a plurality of exhaust expansion chambers C1, C2, C3, C4 are formed. At the time of assembly, a sound absorbing material 53 having a predetermined thickness coated with a binder is wound around the outer periphery of the porous inner tube 51 to which the separator plates 54a, 54b, 54c are attached, and roll forming is performed using a not-shown ironing roller, It is inserted into the outer tube 52.
[0004]
Japanese Patent Laid-Open No. 10-19000, a second example, discloses a silencer attached to a blower pipe of a portable blower (corresponding to the wind pipe according to the present invention). As shown in FIG. 7, the silencer 60 is provided with an enlarged diameter portion 62 extending over a predetermined length L <b> 1 in the axial direction of the blower pipe 61, and an inner pipe 63 having a number of silencer holes 64 inside the enlarged diameter portion 62. The sound absorbing material 65 made of urethane foam is interposed in an annular gap formed between the inserted inner pipe 63 and the enlarged diameter portion 62. The inner pipe 63 is made of a pair of thin plates divided in the axial direction. When assembling, the silencer 65 is attached to the outer periphery of each of the inner pipes 63, and the pair of thin plates is bent so as to be bent from the end of the blower pipe 61. It is inserted and accommodated in the enlarged diameter portion 62. As another method, as shown in FIG. 8, the inner pipe 63 is formed by a strip 66 formed into a spirally wound shape made of a flexible material having moderate elasticity such as polypropylene. . The band member 66 is provided with a number of silence holes 64. At the time of attachment, first, the silencer 65 is inserted from one end of the blower pipe 61, and the silencer 65 is placed in the enlarged diameter portion 62. Next, the strip 66 is pulled in the axial direction so that its outer diameter d2 is smaller than the inner diameter d1 of the blower pipe 61, and after inserting the blower pipe 61, the tensile force is released to increase the outer diameter d2 of the strip 66. The silencer 65 is pressed and attached to the enlarged diameter portion 62.
[0005]
In addition, U.D. S. As shown in the perspective view of FIG. 9, a noise reduction device 70 disclosed in Pat. No. 4421202 is inserted into an outer cylinder 71 with an inner cylinder 73 provided with a pair of collars 72, 72 at both ends. A sound absorbing material 74 is interposed in an annular gap formed between 71 and the inner cylinder 73. The pair of collars 72 and 72 are fastened to the outer cylinder 70 by screws 75. The inner cylinder 73 is formed by assembling twisted strings in a knitted pattern and hardened with a resin, and has a large number of voids.
[0006]
[Problems to be solved by the invention]
However, the above configuration has the following problems.
1) The one disclosed in Japanese Patent No. 2967390 has a problem that it has a large number of parts, a large size, a complicated structure, a heavy weight, and a high cost.
2) In the one disclosed in Japanese Patent Laid-Open No. 10-19000, the operation of housing the sound deadening material 65 in the enlarged diameter portion 62 is very troublesome, and the inner pipe 63 is placed inside the sound deadening material 65. It is necessary to insert. Therefore, there are problems that assembly is complicated, man-hours are required, the number of parts is large, and the cost is high.
3) U. S. The one disclosed in Pat. No. 4421202 has a problem that the number of parts is large, the structure is complicated, a lot of man-hours are required for assembly, and the cost is increased.
[0007]
The present invention pays attention to the above-mentioned problems, and an object of the present invention is to provide a sound-absorbing material-attached wind pipe that is lightweight, has a simple structure, has a small number of parts, is easy to manufacture, and is low in cost.
[0008]
[Means, actions and effects for solving the problems]
In order to achieve the above-mentioned object, the sound-absorbing material-equipped wind tube according to the present invention is cylindrical and has a plurality of through holes in an outer peripheral wall surface portion having a predetermined length in the longitudinal direction, and ventilates air or the like inside. In a wind pipe with a sound absorbing material comprising an inner pipe, an outer pipe covering the through-hole portion, and a sound absorbing material interposed between the inner pipe and the outer pipe, the inner pipe is provided at the tip of one side. A protrusion for preventing rotation, a flange provided near the end on the other side, a diameter greater than the outer diameter of the sound absorbing material, an annular protrusion provided on the outer periphery of the flange, and the tip A plurality of through holes provided in a wall surface portion between the first portion and the flange portion, and the outer tube is provided on one side of the enlarged diameter portion and a diameter increasing portion that covers the through hole of the inner tube. A fitting portion having a groove portion that engages with the protrusion and an opening on the other side of the enlarged diameter portion, and the flange portion is fitted therein. And the engaging portion, provided on the inner peripheral portion of the engaging portion, and configured to have an annular groove which engages the annular projection of the flange portion.
[0009]
According to the above configuration, the inner tube is inserted into the sound absorbing material, this is inserted into the outer tube, the tip of the inner tube is fitted into the fitting portion of the outer tube, and the protrusion and the groove are engaged. A flange portion is fitted into the engaging portion, and the annular groove and the annular convex portion are engaged. As a result, the inner tube and the outer tube are joined together, and the sound absorbing material-equipped wind tube can be configured easily. Therefore, it is possible to obtain a sound-absorbing material-equipped wind tube with a small number of parts, a simple structure, and low cost. In addition, since there is a detent between the inner tube and the outer tube, there is no relative rotation, and when assembling work to connect the wind tube to the wind tube with sound absorbing material, the inner tube and the outer tube Since they do not rotate with each other, assembly work is easy.
[0010]
Next, in the method of manufacturing the sound-absorbing material-equipped wind tube according to the present invention, a cylindrical shape having a plurality of through holes in the outer peripheral wall surface of a predetermined length in the longitudinal direction, and an inner tube through which air passes, In the manufacturing method of the sound absorbing material-equipped wind pipe comprising the outer tube covering the through hole portion and the sound absorbing material interposed between the inner tube and the outer tube, the outer diameter of the sound absorbing material is near the end in the longitudinal direction. A cylindrical inner pipe made of resin having a flange part with a large diameter and an annular convex part on the outer periphery of the flange part is manufactured, and then this inner pipe is inserted into a cylindrical soundproofing material. A diameter-enlarged portion that covers the soundproofing material, a fitting portion that is provided on one side of the expanded-diameter portion, and that fits into a distal end portion of the inner tube, and that is provided to open on the other side of the expanded-diameter portion. A resin outer tube having an engagement portion having an annular groove on the inner peripheral portion for engaging with the annular convex portion of the flange portion, and after molding, Insert the inner tube with soundproofing material within a predetermined time when the temperature is high and insert the tip of the inner tube into the fitting part, and insert the flange part of the inner pipe into the engaging part In the manufacturing method, the annular groove of the engaging portion is engaged with the convex portion.
[0011]
According to the above method, the inner tube and the outer tube are made of resin and are lightweight. Also, in the assembly stage, after inserting the inner tube made in advance into the sound absorbing material and blow molding the outer tube, the inner tube is inserted within a predetermined time when the temperature is high, and after cooling, the flange portion of the inner tube and the outer tube Since the engaging portion is coupled, it can be assembled with a small number of parts and a small number of man-hours, and the cost is reduced.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a wind tube with a sound absorbing material of the present invention will be described in detail with reference to the drawings. A portable blower will be described as an example of an application machine of the present invention.
[0013]
First, referring to FIG. 1, a schematic configuration of a portable blower 1 provided with a sound-absorbing material-equipped wind pipe 20 according to the present invention will be described. A blower 4 driven by an engine 5 is mounted on the substantially L-shaped frame 3. An elbow 10 is attached to the air discharge port 7 of the blower 4, and an upstream wind pipe 12, a sound-absorbing material wind pipe 20, and a downstream wind pipe 13 are sequentially attached to the tip of the elbow 10 via a flexible tube 11. Is connected, and blows off dead leaves and the like by blowing out wind from the tip. The operator carries the portable blower 1 on his / her back and holds the wind pipes 12 and 13 for cleaning work.
[0014]
Next, the structure of the wind tube 20 with the sound absorbing material will be described. FIG. 2 is a partial cross-sectional view of the side surface of the sound absorbing material-equipped wind tube 20. In FIG. 2, the sound absorbing material-equipped wind tube 20 includes a cylindrical inner tube 21, a cylindrical outer tube 30 covering the inner tube 21, and a cylindrical shape interposed between the inner tube 21 and the outer tube 30. Sound absorbing material 40. One side of the sound absorbing material-equipped wind pipe 20 is connected to the upstream side wind pipe 12, and the other side is connected to the downstream side wind pipe 13. 3 is an AA arrow view of FIG. 2, FIG. 4 is a BB arrow view of FIG. 2, and FIG. 5 is an exploded perspective view showing a configuration of the sound absorbing material-equipped wind tube 20. 2, 3, 4, and 5, the distal end portion 22 on one side in the longitudinal direction of the inner tube 21 is provided with a pair of anti-rotation projections 23 and 23, and the other end portion is downstream. A downstream connection portion 24 connected to the side wind tube 13 is provided. The downstream connection portion 24 is provided with a projection 24 a for connection with the downstream wind tube 13. Further, a flange portion 25 having an outer diameter D larger than the outer diameter C of the sound absorbing material 40 is integrally formed in the vicinity of the downstream connection portion 24, and an annular convex portion 26 is provided on the outer peripheral portion thereof. A plurality of through holes 27 are provided in the cylindrical surface between the protruding portion 23 and the flange portion 25. An upstream connection portion 32 connected to the upstream wind tube 12 is provided at one end portion of the enlarged diameter portion 31 that covers the sound absorbing material 40 of the outer tube 30, and between the enlarged diameter portion 31 and the upstream connection portion 32. A fitting portion 33 for fitting the distal end portion 22 of the inner tube 21 is provided. The upstream side connection portion 32 is provided with a connection groove 32 a for connection with the upstream side wind pipe 12. The fitting portion 33 is provided with a pair of groove portions 34, 34 that engage with the projection portions 23, 23 provided at the distal end portion 22 of the inner tube 21, and engage with each other during assembly to prevent mutual rotation. It is like that. An engaging portion 35 is provided on the other side of the enlarged diameter portion 31 so as to open and fit the flange portion 25 of the inner tube 21. The inner peripheral portion of the engaging portion 35 is engaged with the annular convex portion 26 of the flange portion 25. An annular groove 36 is provided, and engages with each other to join the inner tube 21 and the outer tube 30 together. A cylindrical sound absorbing material 40 is interposed in the space formed by the inner tube 21 and the enlarged diameter portion 31 of the outer tube 30.
[0015]
In the present embodiment, as an example, the annular convex portion 26 and the annular groove 36 are provided at three locations, but may be provided at one location, two locations, or a plurality of four or more locations.
[0016]
Since the wind tube 20 with the sound absorbing material of the present invention is configured as described above, the inner tube 21 and the outer tube 30 do not rotate relative to each other and do not expand or contract in the longitudinal direction. Further, noise of air passing through the pipe is absorbed by the sound absorbing material 40, and the noise is reduced.
[0017]
Next, a manufacturing method will be described. The inner tube 21 is made of resin such as ABS or polyamide, and is manufactured by injection molding. The outer tube 30 is made of resin such as polyethylene, polypropylene, and polyamide, and is manufactured by blow molding. When assembling, first, the inner tube 21 is manufactured and inserted into the cylindrical sound absorbing material 40. Next, the outer tube 30 is blow-molded, and the inner tube 21 with the sound absorbing material 40 is inserted within a predetermined period of time during which the temperature is high (for example, within 10 minutes after molding), and the distal end portion 22 of the inner tube 21 is fitted to the outer tube 30. The protrusion 23 and the groove 34 are engaged with each other while being fitted into the joint portion 33. At the same time, the flange portion 25 of the inner tube 21 is fitted into the engaging portion 35 of the outer tube 30. Since the outer tube 30 is not hardened within a predetermined time when the temperature is high after blow molding and has elasticity, the annular convex portion 26 of the inner tube 21 can be easily extended by expanding the annular groove 36 of the engaging portion 35. Can be inserted. As time passes, the extended portion of the outer tube 30 contracts and is cooled and hardened, and the annular groove 36 of the engaging portion 35 is firmly engaged with the annular convex portion 26 of the inner tube 21, The inner tube 21 and the outer tube 30 are combined. Cooling of the outer tube 30 may be performed by natural heat dissipation, or cooling may be forcedly blown to promote cooling.
[0018]
Since the wind tube with a sound absorbing material and the manufacturing method thereof according to the present invention are as described above, a wind tube with a sound absorbing material that is easy to assemble, has a simple structure, has a small number of parts, is light in weight, is easy to manufacture, and is inexpensive. can get.
[Brief description of the drawings]
FIG. 1 is a perspective view of a portable blower provided with a wind pipe with a sound absorbing material of the present invention.
FIG. 2 is a partial cross-sectional side view of a wind tube with a sound absorbing material of the present invention.
FIG. 3 is a view taken along arrow AA in FIG. 2;
4 is a view taken along arrow BB in FIG. 2;
FIG. 5 is an exploded perspective view of a wind tube with a sound absorbing material of the present invention.
FIG. 6 is a side sectional view of a silencer with a sound absorbing material according to a first example of the prior art.
FIG. 7 is a side cross-sectional view of a second example of a conventional wind tube with a sound absorbing material.
FIG. 8 is a side view of an inner pipe of a sound pipe with sound absorbing material according to a second example of the prior art.
FIG. 9 is an exploded perspective view of a third example of a conventional wind tube with a sound absorbing material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Portable blower, 12 ... Upstream side wind pipe, 13 ... Downstream side wind pipe, 20 ... Wind pipe with sound-absorbing material, 21 ... Inner pipe, 22 ... Tip part, 23 ... Projection part, 25 ... Flange part, 26 ... An annular convex part, 30 ... an outer tube, 31 ... an enlarged diameter part, 33 ... a fitting part, 34 ... a groove part, 35 ... an engaging part, 36 ... an annular groove, 40 ... a sound absorbing material.

Claims (2)

円筒形で、長手方向の所定長さの外周壁面部に複数個の貫通穴を有し、内部に空気等を通風する内管と、貫通穴部を覆う外管と、内管と外管との間に介装された吸音材とよりなる吸音材付風管において、
前記内管(21)は、一側の先端部(22)に設けられた回り止め用の突起部(23)と、他側の端部近傍に設けられた、吸音材(40)の外径より径の大きいフランジ部(25)と、フランジ部(25)の外周部に設けられた環状凸部(26)と、前記先端部(22)とフランジ部(25)との間の壁面部に設けられた複数個の貫通穴(27)とを有し、前記外管(30)は、前記内管(21)の貫通穴(27)を覆う拡径部(31)と、拡径部(31)の一側に設けられ、内管(21)を嵌入させるとともに前記突起部(23)に係合する溝部(34)を有する嵌合部(33)と、拡径部(31)の他側に開口して設けられ、前記フランジ部(25)を嵌入させる係合部(35)と、この係合部(35)の内周部に設けられ、フランジ部(25)の環状凸部(26)に係合する環状溝(36)とを有する
ことを特徴とする吸音材付風管。A cylindrical shape having a plurality of through holes in an outer peripheral wall surface portion having a predetermined length in the longitudinal direction, an inner tube through which air or the like is ventilated, an outer tube covering the through holes, an inner tube and an outer tube In a wind tube with a sound absorbing material consisting of a sound absorbing material interposed between
The inner pipe (21) is an outer diameter of the sound absorbing material (40) provided in the vicinity of the rotation-preventing projection (23) provided on the tip end (22) on one side and the end on the other side. A flange portion (25) having a larger diameter, an annular convex portion (26) provided on the outer peripheral portion of the flange portion (25), and a wall surface portion between the tip portion (22) and the flange portion (25) A plurality of through-holes (27) provided, and the outer pipe (30) has an enlarged diameter part (31) covering the through-hole (27) of the inner pipe (21), and an enlarged diameter part ( 31), a fitting portion (33) having a groove portion (34) for fitting the inner tube (21) and engaging with the projection portion (23), and the other end of the diameter-expanding portion (31). An engagement portion (35) for opening the flange portion (25), and an annular convex portion of the flange portion (25) provided on the inner peripheral portion of the engagement portion (35). 26) A wind tube with a sound absorbing material, characterized by having an annular groove (36) engaged with 26). 円筒形で、長手方向の所定長さの外周壁面部に複数個の貫通穴を有し、内部に空気を通す内管と、貫通穴部を覆う外管と、内管と外管との間に介装された吸音材とよりなる吸音材付風管の製造方法において、
長手方向の端部近傍に吸音材(40)の外径より径の大きいフランジ部(25)を有し、フランジ部(25)の外周部に環状凸部(26)を備えた樹脂製の円筒状の内管(21)を製作し、次に、この内管(21)を円筒状の防音材(40)に挿入し、次に、防音材(40)を覆う拡径部(31)と、拡径部(31)の一側に設けられ、内管(21)の先端部(22)を嵌入させる嵌合部(33)と、拡径部(31)の他側に開口して設けられ、前記内管(21)のフランジ部(25)を嵌入させるとともに、フランジ部(25)の環状凸部(26)に係合する環状溝(36)を内周部に有する係合部(35)とを有する樹脂製の外管(30)をブロー成形し、成形後、温度の高い所定時間内に防音材(40)付の内管(21)を挿入して嵌合部(33)に内管(21)の先端部(22)を嵌入するとともに、係合部(35)に内管(21)のフランジ部(25)を嵌入し、冷却後にフランジ部(25)の環状凸部(26)に係合部(35)の環状溝(36)を係合させる
ことを特徴とする吸音材付風管の製造方法。A cylindrical shape having a plurality of through holes in the outer peripheral wall surface of a predetermined length in the longitudinal direction, an inner tube through which air passes, an outer tube covering the through holes, and between the inner tube and the outer tube In the manufacturing method of the sound pipe with sound absorbing material comprising the sound absorbing material interposed in,
A resin cylinder having a flange portion (25) having a diameter larger than the outer diameter of the sound absorbing material (40) in the vicinity of the end in the longitudinal direction and having an annular convex portion (26) on the outer peripheral portion of the flange portion (25). The inner pipe (21) is manufactured, and then the inner pipe (21) is inserted into the cylindrical soundproofing material (40) .Then, the enlarged diameter portion (31) covering the soundproofing material (40) and , Provided on one side of the enlarged diameter portion (31), and provided on the other side of the enlarged diameter portion (31) and a fitting portion (33) for fitting the distal end portion (22) of the inner tube (21). And an engaging portion (5) on the inner peripheral portion of the inner pipe (21) with an annular groove (36) engaged with the annular convex portion (26) of the flange portion (25). 35) and blow molding the resin outer tube (30), and after molding, insert the inner tube (21) with the soundproof material (40) within a predetermined time when the temperature is high, and the fitting portion (33) The end (22) of the inner pipe (21) is fitted into the flange part (25) of the inner pipe (21) is fitted into the engaging part (35), and the annular convex part of the flange part (25) is cooled. (26) A method of manufacturing a wind tube with a sound absorbing material, wherein the annular groove (36) of the engaging portion (35) is engaged.
JP2000337829A 2000-11-06 2000-11-06 Wind tube with sound absorbing material and method of manufacturing the same Expired - Fee Related JP4526688B2 (en)

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JPH04137210U (en) * 1991-06-10 1992-12-21 カルソニツク株式会社 Sound absorbing silencer
JPH09287600A (en) * 1996-04-24 1997-11-04 Kioritz Corp Blower pipe having silencer
JPH1019000A (en) * 1996-07-01 1998-01-20 Kioritz Corp Attaching method for muffler to blower pipe
US5979013A (en) * 1998-03-10 1999-11-09 The Toro Company Portable blower with noise reduction
JP2001289026A (en) * 2000-04-05 2001-10-19 Komatsu Zenoah Co Air duct with sound absorbing material

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61123822U (en) * 1985-01-21 1986-08-04
JPH04137210U (en) * 1991-06-10 1992-12-21 カルソニツク株式会社 Sound absorbing silencer
JPH09287600A (en) * 1996-04-24 1997-11-04 Kioritz Corp Blower pipe having silencer
JPH1019000A (en) * 1996-07-01 1998-01-20 Kioritz Corp Attaching method for muffler to blower pipe
US5979013A (en) * 1998-03-10 1999-11-09 The Toro Company Portable blower with noise reduction
JP2001289026A (en) * 2000-04-05 2001-10-19 Komatsu Zenoah Co Air duct with sound absorbing material

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