JP4526688B2 - Wind tube and a manufacturing method thereof with sound-absorbing material - Google Patents

Wind tube and a manufacturing method thereof with sound-absorbing material 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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portion
tube
inner tube
absorbing material
outer
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JP2002138829A (en
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敏 中澤
成浩 小野澤
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ハスクバーナ・ゼノア株式会社
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【0001】 [0001]
【発明の属する技術分野】 BACKGROUND OF THE INVENTION
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。 The present invention, a sound absorbing material provided in ventilation tube for ventilating air and the like, wind pipe with sound absorbing material to reduce the noise of air passing through, and a method for producing the same.
【0002】 [0002]
【従来の技術】 BACKGROUND OF THE INVENTION
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。 Conventionally, in order to reduce noise or exhaust of air or the engine, the blower through the cylindrical tube, ones having a muffler in the middle of the tube is seen various. 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. Japanese Patent No. 2967390 As an example (U.S.Pat.No. No. 5,718,045), JP-A-10-19000 Patent Publication (U.S.Pat.No. No. 5,821,473), U. S. S. Pat.No. 4421202号に開示されたものがある。 It is disclosed in US Pat.No. 4421202.
【0003】 [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。 Those disclosed in Japanese Patent No. 2967390 of the first example, is intended to reduce the exhaust sound of an internal combustion engine. 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。 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 outer tube 52 that surrounds the perforated inner pipe 51 and the perforated inner pipe 51 there. 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。 Front and rear end portions 51a of the perforated inner pipe 51, 51b has a larger diameter than the intermediate portion. 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。 The front and rear end portions of the outer tube 52, the outer periphery of each cap 55, 56 is welded. 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。 A plurality of separator plates 54a inside a perforated inner tube 51, 54b, 54c, provided, has a configuration which is formed with a plurality of exhaust expansion chamber C1, C2, C3, C4. 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。 In assembly, the separator plate 54a, 54b, the outer periphery of the perforated inner pipe 51 attached to 54c, winding sound absorbing material 53 having a predetermined thickness, which is coated with a binder, subjected to roll forming by using a squeezing roller (not shown) It is to be inserted into the outer tube 52.
【0004】 [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。 The JP-A 10-19000 discloses a second example, the muffler is disclosed which is attached to the portable blower blower pipe (corresponding to wind tube according to the present invention). 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。 As shown in FIG. 7, the muffler 60, the enlarged diameter portion 62 extending over a predetermined length L1 in the axial direction of the blower pipe 61 is provided, the inner pipe 63 having a large number of silencing holes 64 inside the enlarged diameter portion 62 inserted, and has a configuration which is interposed a silencing member 65 made of urethane foam into the annular gap formed between the inner pipe 63 and the enlarged diameter portion 62 inserted. 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。 The inner pipe 63 is made of a pair of thin plate that is divided into two in the axial direction, in assembling the silencing material 65 is attached to each outer periphery, from the end of the blower pipe 61 by bending the pair of thin plate inserted, it is adapted to receive the enlarged portion 62. 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。 Further, as another method, as shown in FIG. 8, the inner pipe 63, formed by strips 66 which are formed into a shape spirally wound of flexible material having a suitable elasticity such as polypropylene . 帯材66には、多数の消音孔64が設けられている。 The strip 66, a large number of silencing holes 64 are provided. 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。 During mounting, first insert the silencing material 65 from one end of the blower pipe 61, pay silencing material 65 in the enlarged diameter portion 62. 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。 Next, the outer diameter d2 smaller than the inner diameter d1 of the blower pipe 61 to pull the strip 66 in the axial direction, after insertion into blower pipe 61, and increasing the outer diameter d2 of the strip 66 to release the tensile force , so that mounting by pressing the silencing material 65 in the enlarged diameter portion 62.
【0005】 [0005]
また、第3例のU. Also, U. of the third example S. 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。 Pat.No. 4421202 Patent noise reduction device 70 disclosed in the as shown in the perspective view of FIG. 9, insert the inner cylinder 73 in which a pair of flange 72, 72 at both ends to the outer tube 71, the outer cylinder It has a configuration which is interposed a sound absorbing material 74 in the annular gap formed between the inner tube 73 and 71. 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。 A pair of collar 72 is adapted to be fastened by screws 75 to the outer cylinder 70. 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。 The inner cylinder 73, twisted pair the string to stitch shape, and which was solidified with a resin, has numerous voids.
【0006】 [0006]
【発明が解決しようとする課題】 [Problems that the Invention is to Solve
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。 However, in the above configuration has the following problems.
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。 1) In the one disclosed in Japanese Patent No. 2967390, many parts, and the structure is complicated large, heavy in weight, there is a problem that the cost becomes high.
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。 In the 2) those disclosed in JP-A-10-19000, the task of housing the silencer material 65 in the enlarged diameter portion 62 is very troublesome, further an inner pipe 63 inside the silencer material 65 it is necessary to insert. 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。 Therefore, the assembly is complicated, requires man-hours, with many parts there is a problem that high cost.
3)またU. 3) The U. S. 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。 In the one disclosed in JP Pat.No. 4,421,202, the number of parts is large and structure is complicated, requires a lot of man-hours in the assembly, there is a problem that the cost becomes high.
【0007】 [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。 The present invention is focused on problems described above, a light weight, the structure is fewer components is easy, and its object is to provide a wind pipe and a manufacturing method thereof with low sound-absorbing material of easy manufacturing cost.
【0008】 [0008]
【課題を解決するための手段、作用及び効果】 Means for Solving the Problems, operation and effect]
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 To achieve the above object, the sound absorbing with material ventilation tube according to the present invention is a cylindrical, having a plurality of through-holes in the outer peripheral wall portion in the longitudinal direction of the predetermined length, ventilating air and the like inside an inner tube, an outer tube covering the through hole, the inner tube and become more sound absorbing with material ventilation tube and interposed a sound absorbing material between the outer tube, the inner tube is provided at the distal end portion of the one side a projection of the detent that is, provided in the vicinity of the end portion of the other side, a large flange diameter than the outer diameter of the sound absorbing material, and the annular projection provided on the outer peripheral portion of the flange portion, the tip parts and has a through hole plurality of provided in the wall portion between the flange portion, the outer tube has a diameter portion covering the through hole of the inner tube, provided on one side of the enlarged diameter portion is a fitting portion having a groove for engaging the protruding portion causes fitting the inner tube, open provided on the other side of the enlarged diameter portion, is fitted to the flange portion 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。 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】 [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。 According to the above configuration, by inserting the inner tube into the sound absorbing material, which was inserted into the outer tube is fitted to the distal end portion of the inner tube to the fitting portion of the outer tube, it is engaged with the projection and the groove, and fitting the flange portion to the engaging portion, it is engaged with the annular groove and the annular projection. 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。 Thus the inner and outer tubes are coupled, easily, it can be configured easily ventilation tube with sound absorbing material. 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。 Accordingly, fewer parts, simple structure, low noise absorbing member with the wind pipe cost is obtained. 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。 Moreover, never rotate relative order detent is provided between the inner tube and the outer tube, when the assembling operation of connecting the ventilation tube in the wind pipe with sound absorbing material, the inner and outer tubes because There is not the mutual rotation, easy to do assembly work.
【0010】 [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 Next, in the method for manufacturing the sound-absorbing material with the wind pipe of the present invention, cylindrical, it has a plurality of through-holes in the outer peripheral wall portion in the longitudinal direction of the predetermined length, and the inner tube through the air therein, an outer tube covering the through hole, in interposed process for the preparation of a more comprising sound absorbing material with wind pipe and sound absorbing material between the inner and outer tubes, than the outer diameter of the sound absorbing material in the vicinity of the end of the longitudinal has a larger flange portion of diameter, the flange portion outer peripheral portion to manufacture a cylindrical inner tube made of resin with an annular protrusion on the, then, insert this inner tube in a cylindrical acoustic insulation, following in the enlarged diameter portion covering the soundproofing material, it is provided on one side of the enlarged diameter portion, a fitting portion for fitting the distal end portion of the inner tube, open provided on the other side of the enlarged diameter portion, the inner tube It causes fitting the flange portion, the outer tube made of a resin having an engaging portion with the inner peripheral portion of the annular groove that engages with the annular projection of the flange portion to blow molding, after molding 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。 With fitting the distal end of the tube to the fitting portion by inserting the inner tube with sound insulation to high temperatures within a predetermined time, and fitting the flange portion of the inner tube engaging portion, annular flange portion after cooling and a production method of engaging the annular groove of the engaging portion with the convex portion.
【0011】 [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。 According to the above method, the inner and outer tubes are lightweight because it is made of resin. 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。 Further, in the assembly stage, and insert the inner tube with prefabricated sound absorbing material, after the outer tube by blow molding, fitted the inner tube in a high temperature a predetermined time, after the flange portion of the inner tube and the outer tube cooling due to the so as to couple the engagement portion, and a small number of components, is capable of assembly by a reduced number of steps, cost becomes cheaper.
【0012】 [0012]
【発明の実施の形態】 DETAILED DESCRIPTION OF THE INVENTION
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。 Hereinafter will be described in detail with reference to the accompanying drawings, embodiments of the sound-absorbing material with the wind pipe of the present invention. 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。 Incidentally, description will be given of portable blower as an application machine of the present invention.
【0013】 [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。 First the FIG. 1, an outline configuration of a portable blower 1 having a sound-absorbing material with ventilation tube 20 according to the present invention. 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。 On a substantially L-shaped frame 3, a blower 4 is driven by the engine 5 is mounted. 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。 Elbow 10 is attached to the air outlet 7 of the blower 4, the distal end portion sequentially upstream ventilation tube 12 through the flexible fit tube 11 to the elbow 10, with sound-absorbing material ventilation tube 20 and the downstream ventilation tube 13 There are connected, so that the blow off dead leaves or the like by ejecting the air from the tip. 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。 Operator piggybacks portable blower 1, the cleaning operation performed by gripping the wind pipe 12, 13.
【0014】 [0014]
つぎに吸音材付風管20の構造について説明する。 It will now be described the structure of the sound absorbing with material ventilation tube 20. 図2は吸音材付風管20の側面一部断面図である。 Figure 2 is a partial cross sectional side view of the sound absorbing with material ventilation tube 20. 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。 2, with sound-absorbing material ventilation tube 20 has a cylindrical inner tube 21, a cylindrical outer tube 30 covering the inner tube 21, interposed a cylindrical between the inner tube 21 and outer tube 30 and a sound absorbing material 40. 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。 One side of the sound-absorbing material with ventilation tube 20 connected to the upstream ventilation tube 12, the other side is connected to the downstream ventilation tube 13. 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。 3 is an A-A arrow view of FIG. 2, FIG. 4 is a taken along line B-B view of figure 2, Figure 5 is an exploded perspective view showing the construction of a sound absorbing material with ventilation tube 20. 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。 2, 3, 4, 5, in the longitudinal direction of the one side of the distal end portion 22 of the inner tube 21, projections 23 and 23 of a pair of detent is provided at the other end downstream downstream side connecting portion 24 connected to the side air tube 13 is provided. 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。 The downstream-side connecting portion 24 connecting projections 24a of the downstream ventilation tube 13 is provided. 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。 Further, in the vicinity of the downstream connecting portion 24 a flange portion 25 having an outer diameter C larger than the outer diameter D of the sound absorbing material 40 is formed integrally with the annular protrusion 26 is provided on its outer periphery. 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。 Then, a plurality of through holes 27 are provided on the cylindrical surface between the projection 23 and the flange portion 25. 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。 At one end of the enlarged diameter portion 31 which covers the sound absorbing material 40 of the outer tube 30 upstream joint 32 connected to the upstream ventilation tube 12 is provided between the enlarged diameter portion 31 and the upstream joint 32 fitting portion 33 for fitting the tip 22 of the inner tube 21 is provided. 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。 The upstream connecting portion 32 connecting groove 32a of the upstream ventilation tube 12 is provided. 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。 The fitting portion 33 has a pair of grooves 34, 34 engage the projections 23, 23 provided at the distal end 22 of inner tube 21 is provided to prevent mutual rotation engage each other during assembly It has become way. 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。 The other side of the enlarged diameter portion 31 engaging portion 35 for fitting the flange portion 25 of the inner tube 21 is opened is provided on the inner peripheral portion of the engaging portion 35 engages the annular projection 26 of the flange portion 25 annular groove 36 is provided with a coupling, which couples the inner tube 21 and outer tube 30 engage with each other. 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。 Cylindrical sound absorbing material 40 is interposed in the space constituted by the enlarged diameter portion 31 of the inner tube 21 and outer tube 30.
【0015】 [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。 In the present embodiment, as an example, it is provided with the annular protrusion 26 and the annular groove 36 three locations, 1 in place, at two locations, or may be provided at a plurality of positions of four or more locations.
【0016】 [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。 Absorbing with material ventilation tube 20 of the present invention is due to the structure described above, the inner tube 21 and outer tube 30 or the relative rotation is not possible to stretch longitudinally. 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。 Further, the noise of the air passing through the tube is absorbed by the sound absorbing material 40, the noise is reduced.
【0017】 [0017]
次に製造方法について説明する。 Next, the manufacturing method will be described. 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。 The inner tube 21 is ABS, a resin such as polyamide, is manufactured by injection molding. 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。 Outer tube 30 is polyethylene, polypropylene, a resin such as polyamide, is manufactured by blow molding. 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。 In assembly, first, it manufactured inner tube 21 is inserted into the cylindrical acoustic material 40. 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。 Then the outer tube 30 and blow molding, and insert the inner tube 21 dated sound absorbing material 40 into a high temperature for a predetermined time (for example within 10 minutes after molding), fitting the front end portion 22 of the inner tube 21 of the outer tube 30 together fitted into engaging portion 33 engaging the projection 23 and the groove 34. 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。 Is fitted into the flange portion 25 of the inner tube 21 with the engaging portion 35 of the outer tube 30 at the same time. 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。 Outer tube 30 after blow molding, not cured within a predetermined high temperature time, since elasticity is present, the annular projection 26 of the inner tube 21 is easily spread stretched annular groove 36 of the engaging portion 35 it can be fitted into. 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。 Then, over time, together with the outer tube 30 is stretched portion shrinks, and cured by cooling, the annular groove 36 of the engaging portion 35 tightly engages the annular convex portion 26 of the inner tube 21, the inner tube 21 and outer tube 30 are coupled. 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。 By cooling the natural radiation of the outer tube 30 may be cooled, it may be forcibly accelerated cooling by blowing cool air.
【0018】 [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。 Since the sound absorbing air tube and a manufacturing method thereof with material of the present invention is as described above, easier assembly work is simple structure, reduced number of parts, is light in weight, easy to manufacture a low-cost sound-absorbing material with the wind pipe can get.
【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS
【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。 1 is a perspective view of a portable blower having a sound absorbing with material ventilation tube of the present invention.
【図2】本発明の吸音材付風管の側面一部断面図である。 2 is a partial cross sectional side view of a sound absorbing material with the wind pipe of the present invention.
【図3】図2のA−A矢視図である。 3 is an A-A arrow view of FIG.
【図4】図2のB−B矢視図である。 [4] a B-B arrow view of FIG.
【図5】本発明の吸音材付風管の分解斜視図である。 5 is an exploded perspective view of a sound absorbing material with the wind pipe of the present invention.
【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。 6 is a side cross-sectional view of a first example of the sound absorbing material with a silencer of the prior art.
【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。 7 is a side cross-sectional view of a second example sound absorbing material with the wind pipe of the prior art.
【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。 8 is a side view of the inner pipe of the sound absorbing with material ventilation tube of the second example of the prior art.
【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。 9 is an exploded perspective view of a third example sound absorbing material with the wind pipe of the prior art.
【符号の説明】 DESCRIPTION OF SYMBOLS
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。 1 ... portable blower, 12 ... upstream ventilation tube, 13 ... downstream ventilation tube, 20 ... sound absorbing with material ventilation tube, 21 ... inner tube, 22 ... tip portion, 23 ... protruding portion, 25 ... flange portion, 26 ... annular projection, 30 ... outer tube, 31 ... enlarged diameter section, 33 ... engaging portion, 34 ... groove, 35 ... engaging portion, 36 ... annular groove, 40 ... sound absorbing material.

Claims (2)

  1. 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、 Cylindrical, having a plurality of through-holes in the outer peripheral wall portion in the longitudinal direction of the predetermined length, and the inner tube for ventilating air and the like inside, and an outer tube covering the through hole, the inner and outer tubes in a more made with sound absorbing material ventilation tube and interposed a sound absorbing material between,
    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。 The inner tube (21) has an outer diameter of the protrusion of the detent provided on one side of the distal end portion (22) and (23), provided in the vicinity of the end portion of the other side, sound-absorbing material (40) a larger flange portion of diameter (25), annular projection provided on the outer peripheral portion of the flange portion (25) and (26), the wall portion between said tip portion (22) flange (25) and a plurality of through holes provided (27), said outer tube (30) is enlarged diameter portion covering the through hole (27) of the inner tube (21) and (31), the enlarged diameter portion ( provided on one side of 31), a fitting portion having a groove for engaging the (34) to the protrusion causes fits the inner tube (21) (23) and (33), the other of the enlarged diameter portion (31) provided open to the side, the engagement portion for fitting the flange portion (25) and (35), provided on the inner peripheral portion of the engaging portion (35), the annular projection of the flange portion (25) ( with sound absorbing material and having an annular groove (36) which engages in 26) ventilation tube.
  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、 Cylindrical, for having a plurality of through-holes in the outer peripheral wall portion in the longitudinal direction of the predetermined length, and the inner tube through the air therein, and an outer tube covering the through hole, the inner and outer tubes in interposed it has been become more sound-absorbing material production method of with the wind pipe and the sound absorbing material,
    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 Longitudinal end near the sound absorbing material large flange diameter than the outer diameter (40) has a (25), the flange portion (25) made of resin cylinder having an outer peripheral portion an annular protrusion (26) of manufactured Jo of the inner tube (21), then, the inner tube (21) inserted into the cylindrical acoustic insulation (40), then the enlarged diameter portion covering soundproofing material (40) and (31) , provided on one side of the enlarged diameter portion (31), a fitting portion for fitting the distal end portion of the inner tube (21) to (22) and (33), open to the other side of the enlarged diameter portion (31) provided are, together to fit the flange portion (25) of the inner tube (21), a flange portion engaging portion with the inner peripheral portion annular projection an annular groove (36) which engages with (26) (25) ( 35) a blow molded outer tube made of resin (30) having, after molding, soundproofing materials in the high temperature predetermined time (40) the inner tube (21) by inserting the fitting portion with (33) in addition to fitting tip of the inner tube (21) to (22), fitted flange portion (25) of the inner tube (21) with the engaging portion (35), the annular projection of the flange portion after cooling (25) (26) 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。 Method of manufacturing with sound absorbing material wind pipe, characterized in that engaging the annular groove (36) of the engaging portion (35).
JP2000337829A 2000-11-06 2000-11-06 Wind tube and a manufacturing method thereof with sound-absorbing material Expired - Fee Related JP4526688B2 (en)

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