JP2010228666A

JP2010228666A - Duct

Info

Publication number: JP2010228666A
Application number: JP2009080218A
Authority: JP
Inventors: Masaya Makihara; 真也牧原; Teruo Shiraishi; 輝男白石
Original assignee: Inoue MTP KK; Inoac Corp
Current assignee: Inoac Corp
Priority date: 2009-03-27
Filing date: 2009-03-27
Publication date: 2010-10-14
Anticipated expiration: 2029-03-27
Also published as: JP5185175B2

Abstract

<P>PROBLEM TO BE SOLVED: To improve the ventilation performance of a bent duct. <P>SOLUTION: A duct 10 comprises a straight pipe 12, a bendable bellows-shaped deformation part 14, and an offset part provided between the straight pipe 12 and the deformation part 14. The offset part 16 is constituted so that a connection part of the deformation part 14 with one end of the offset part 16 connected thereto is deviated to a side forming the inner bend side of the deformation part 14 with respect to the connection part of the straight pipe 12 with the other end of the offset part 16 connected thereto. In the duct 10, a curved portion 10a is constituted of the bent deformation part 14 and the offset part 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

この発明は、蛇腹状の変形部を備え、変形部の曲げ変形により湾曲部分が設けられるダクトに関するものである。 The present invention relates to a duct provided with a bellows-like deformed portion and provided with a curved portion by bending deformation of the deformable portion.

自動車には、車体の乗員室前方にエアコンユニットが設置されると共に、乗員室内に取付けられた車両内装部材(インストルメントパネルやフロアコンソール等)にエアアウトレットが配設され、エアコンユニットから送出された調温空気をエアアウトレットから乗員室内へ吹出して該乗員室内の空調が行なわれる。このため、エアコンユニットとエアアウトレットとは、車両内装部材の裏側に配設されたダクトで連結されている。 In an automobile, an air conditioner unit is installed in front of the passenger compartment of the vehicle body, and an air outlet is disposed on a vehicle interior member (instrument panel, floor console, etc.) installed in the passenger compartment and sent from the air conditioner unit. Temperature-controlled air is blown out from the air outlet into the passenger compartment, thereby air conditioning the passenger compartment. For this reason, the air conditioner unit and the air outlet are connected by a duct disposed on the back side of the vehicle interior member.

前述したダクトは、エアコンユニットおよびエアアウトレットの配置に合わせて途中に湾曲部分を設けて、他の部材に干渉しないように配設されている。例えばダクトとしては、伸縮や曲げ等の変形が可能な蛇腹状の変形部を備え、この変形部の変形によって湾曲部分を形成するものが提案されている(例えば、特許文献１参照)。 The duct described above is provided so that a curved portion is provided on the way in accordance with the arrangement of the air conditioner unit and the air outlet so as not to interfere with other members. For example, a duct has been proposed that includes a bellows-like deformable portion that can be deformed such as expansion and contraction, and that forms a curved portion by deformation of the deformable portion (see, for example, Patent Document 1).

特開２０００−１０８６３７号公報JP 2000-108637 A

図１０に例示するダクト８０のように、蛇腹状の変形部８２を曲げて湾曲部分を形成した際には、当該湾曲部分の曲率が大きくなり、変形した変形部８２で画成される空気流通路８４を通過する空気がスムーズに変向されないことがある。このため、ダクト８０における湾曲部分の空気流通路８４において、曲がりの内側から気流が剥離すると共に、気流が曲がりの外側に集中して、空気流通路８４の断面全体を流路として有効利用できず、圧力損失が大きくなる難点がある。また、ダクト８０における湾曲部分の空気流通路８４において、曲がりの内側から気流が剥離することで、変形部８２の下流側に旋回流(渦)Ｆが発生して圧力損失が大きくなる要因となる。 When the curved portion is formed by bending the bellows-like deformed portion 82 as in the duct 80 illustrated in FIG. 10, the curvature of the curved portion increases, and the air flow defined by the deformed deformed portion 82. The air passing through the path 84 may not be smoothly redirected. For this reason, in the air flow passage 84 in the curved portion of the duct 80, the air flow is separated from the inside of the bend, and the air flow is concentrated on the outside of the bend, so that the entire cross section of the air flow passage 84 cannot be effectively used as the flow path. There is a drawback that the pressure loss becomes large. Moreover, in the air flow passage 84 in the curved portion of the duct 80, the air flow is separated from the inside of the bend, so that a swirling flow (vortex) F is generated on the downstream side of the deformed portion 82, which increases the pressure loss. .

すなわち本発明は、従来の技術に係るダクトに内在する前記問題に鑑み、これらを好適に解決するべく提案されたものであって、湾曲部分における圧力損失を低減し得るダクトを提供することを目的とする。 That is, the present invention has been proposed in order to suitably solve these problems inherent in the duct according to the prior art, and an object of the present invention is to provide a duct that can reduce pressure loss in a curved portion. And

前記課題を克服し、所期の目的を達成するため、本願の請求項１に係る発明のダクトは、
直管部および曲げ変形可能な蛇腹状の変形部を有し、該変形部を曲げて車両に取り付けられるダクトにおいて、
前記直管部と前記変形部との間に偏心部を設け、
前記偏心部は、前記変形部における該偏心部との接続部位の通風断面を、前記直管部における該偏心部との接続部位の通風断面に対して、該変形部の曲がりの内側となる側へずらして繋ぎ、
曲げた前記変形部および前記偏心部によって湾曲部分を構成することを特徴とする。
請求項１に係る発明によれば、直管部と変形部との間に変形部を曲げる方向に合わせた偏心部を設けることで、変形部および偏心部とから構成される湾曲部分の曲率を小さくすることができるので、当該湾曲部分での圧力損失を低減することができる。 In order to overcome the above-mentioned problems and achieve the intended purpose, the duct of the invention according to claim 1 of the present application provides:
In a duct having a straight pipe portion and a bellows-like deformable portion that can be bent and deformed, and the bent portion is bent and attached to a vehicle,
An eccentric part is provided between the straight pipe part and the deformation part,
The eccentric portion has a ventilation cross section of a connecting portion with the eccentric portion in the deformable portion, and a side on the inner side of the bent portion of the deformable portion with respect to the vent cross section of the connecting portion with the eccentric portion in the straight pipe portion. Connect and move
A curved portion is formed by the bent deformed portion and the eccentric portion.
According to the first aspect of the present invention, the curvature of the curved portion composed of the deforming portion and the eccentric portion is provided by providing the eccentric portion in the direction in which the deforming portion is bent between the straight pipe portion and the deforming portion. Since it can be made small, the pressure loss in the said curved part can be reduced.

請求項２に係る発明では、前記偏心部は、前記直管部との接続端から前記変形部との接続端に向かうにつれて、該変形部の曲がりの内側となる側が凹となるように湾曲していることを要旨とする。
請求項２に係る発明によれば、偏心部を湾曲形状にすることで、ダクトの湾曲部分の曲面を滑らかにすることができ、当該湾曲部分での圧力損失をより低減することができる。 In the invention according to claim 2, the eccentric portion bends so that the side that is the inside of the bending of the deforming portion becomes concave as it goes from the connecting end to the straight pipe portion to the connecting end to the deforming portion. It is a summary.
According to the invention which concerns on Claim 2, the curved surface of the duct part can be made smooth by making an eccentric part into a curve shape, and the pressure loss in the said curve part can be reduced more.

請求項３に係る発明では、前記偏心部は、前記変形部の両側に夫々設けられることを要旨とする。
請求項３に係る発明によれば、変形部の両側に偏心部を設けることで、変形部および２つの偏心部とから構成される湾曲部分の曲率をより小さくすることができるので、当該湾曲部分での圧力損失を更に低減することができる。 The gist of the invention according to claim 3 is that the eccentric portion is provided on each side of the deformable portion.
According to the invention of claim 3, by providing the eccentric portions on both sides of the deformable portion, the curvature of the curved portion constituted by the deformable portion and the two eccentric portions can be further reduced. The pressure loss at can be further reduced.

請求項４に係る発明では、前記変形部を挟んで設けられた一対の直管部の中心軸線が、該変形部の直線状態において同一直線上に位置することを要旨とする。
請求項４に係る発明によれば、湾曲部分での圧力損失を低減することができる。 The gist of the invention according to claim 4 is that the central axes of the pair of straight pipe portions provided with the deformation portion interposed therebetween are positioned on the same straight line in the linear state of the deformation portion.
According to the invention which concerns on Claim 4, the pressure loss in a curved part can be reduced.

請求項５に係る発明では、前記変形部は、曲がった状態で自己保持可能に構成されることを要旨とする。
請求項５に係る発明によれば、変形部が曲がった状態で自己保持するので、別途の支持金具を用いることなく、圧力損失を有利に低減できる湾曲部分の曲がり角度を適切に維持し得る。 The gist of the invention according to claim 5 is that the deformable portion is configured to be capable of self-holding in a bent state.
According to the invention which concerns on Claim 5, since the deformation | transformation part hold | maintains in the bent state, the bending angle of the curved part which can reduce pressure loss advantageously can be maintained appropriately, without using a separate support metal fitting.

本発明に係るダクトによれば、湾曲部分において圧力損失を低減でき、通風性能を向上できる。 According to the duct according to the present invention, pressure loss can be reduced at the curved portion, and ventilation performance can be improved.

実施例のダクトを、エアコンユニットおよびエアアウトレットに夫々接続した状態で示した説明図である。It is explanatory drawing shown in the state which connected the duct of the Example to the air-conditioner unit and the air outlet, respectively. 実施例のダクトを示す平面図であって、直線状態とした変形部を拡開していいる。It is a top view which shows the duct of an Example, Comprising: The deformation | transformation part made into the linear state is expanded. 実施例のダクトを示す平面図であって、直線状態とした変形部を縮めている。It is a top view which shows the duct of an Example, Comprising: The deformation | transformation part made into the linear state is shrunk | reduced. 実施例のダクトの湾曲部分を拡大して示す平面図である。It is a top view which expands and shows the curved part of the duct of an Example. 変形部における各突状部の第２壁部が第１状態に変形し、隣り合う谷部同士が近接した状態に保持されることを示した部分断面図である。It is the fragmentary sectional view which showed that the 2nd wall part of each protrusion-shaped part in a deformation | transformation part deform | transforms into a 1st state, and the adjacent trough parts hold | maintained in the close proximity | contact state. 変形部における各突状部の第２壁部が第２状態に変形し、隣り合う谷部同士が離間した状態に保持されることを示した部分断面図である。It is the fragmentary sectional view which showed that the 2nd wall part of each protrusion-shaped part in a deformation | transformation part deform | transforms into a 2nd state, and the adjacent trough parts hold | maintained in the separated state. 実施例の突状部における第１壁部および第２壁部の形状を示した拡大断面図である。It is the expanded sectional view which showed the shape of the 1st wall part in the protrusion part of an Example, and the 2nd wall part. 変形部の曲がり角度が９０°となる実験例２のダクトの平面図であって、変形部を真っ直ぐにした状態で示す。It is a top view of the duct of Experimental example 2 in which the bending angle of a deformation | transformation part becomes 90 degrees, Comprising: It shows in the state which made the deformation | transformation part straight. 実験例２のダクトを示す平面図であって、(ａ)は湾曲部分を９０°とした場合を示し、(ｂ)は湾曲部分を７５°とした場合を示し、(ｃ)は湾曲部分を６０°とした場合を示し、(ｄ)は湾曲部分を４５°とした場合を示し、(ｅ)は湾曲部分を３０°とした場合を示す。It is a top view which shows the duct of Experimental example 2, Comprising: (a) shows the case where a curved part is 90 degrees, (b) shows the case where a curved part is 75 degrees, (c) shows the curved part. The case of 60 ° is shown, (d) shows the case where the curved portion is 45 °, and (e) shows the case where the curved portion is 30 °. 従来のダクトを示す平面図である。It is a top view which shows the conventional duct.

次に、本発明に係るダクトにつき、好適な実施例を挙げて、添付図面を参照して以下に説明する。実施例では、図１に示すように、自動車の乗員室に設置されたエアコンユニットＡＣと、乗員室内に設置された車両内装部材ＩＰに配設されたエアアウトレットＡＯとに夫々連結され、エアコンユニットＡＣから送出された調温空気をエアアウトレットＡＯへ案内するダクト１０を例示する。 Next, a preferred embodiment of the duct according to the present invention will be described below with reference to the accompanying drawings. In the embodiment, as shown in FIG. 1, the air conditioner unit AC installed in the passenger compartment of the automobile and the air outlet AO arranged in the vehicle interior member IP installed in the passenger compartment are respectively connected to the air conditioner unit. The duct 10 which guides the temperature-controlled air sent out from AC to the air outlet AO is illustrated.

図１に示すように、実施例のダクト１０は、筒状の直管部１２と、曲げ変形可能な蛇腹状の変形部１４と、直管部１２および変形部１４の間に設けた偏心部１６とから構成されている。また、ダクト１０は、変形部１４および偏心部１６についても基本形状が筒状であって、一方の開口端から他方の開口端に連通する空気流通路１８が内部に画成されている。実施例のダクト１０では、変形部１４が空気流通方向に離間して途中に２ヶ所設けられると共に、エアエアコンユニットＡＣおよびエアアウトレットＡＯに接続する部位が直管部１２で構成されている。ここで、実施例のダクト１０では、曲げた変形部１４と偏心部１６とにより湾曲部分１０ａを構成して、エアコンユニットＡＣやエアアウトレットＡＯ等の空気案内対象に接続されるものであって、変形部１４を曲げて車両に取り付けることを前提としている。 As shown in FIG. 1, the duct 10 according to the embodiment includes a cylindrical straight pipe portion 12, a bellows-like deformable portion 14 that can be bent and deformed, and an eccentric portion provided between the straight pipe portion 12 and the deformable portion 14. 16. The duct 10 also has a cylindrical shape in the deformable portion 14 and the eccentric portion 16, and an air flow passage 18 communicating from one opening end to the other opening end is defined inside. In the duct 10 according to the embodiment, the deformable portion 14 is provided in two places in the middle of the air flow direction, and the portion connected to the air air conditioner unit AC and the air outlet AO is constituted by the straight pipe portion 12. Here, in the duct 10 of the embodiment, the bent deformed portion 14 and the eccentric portion 16 constitute a curved portion 10a and is connected to an air guide target such as an air conditioner unit AC or an air outlet AO. It is assumed that the deformable portion 14 is bent and attached to the vehicle.

実施例の直管部１２は、円筒形であって、空気流通方向上流側から下流側の全体に亘って同一の径で形成されている(図１または図２参照)。また、直管部１２は、該直管部１２に画成される空気流通路１８の中心軸線Ｃが一直線になるように直線的に形成されており、ダクト１０の直線部分を構成している。ここで、ダクト１０の中心軸線Ｃは、直管部１２、変形部１４および偏心部１６の形状によって規定される空気流通路１８において空気流通方向に交差する通風断面の中心を通る仮想線であって、空気流通路１８の空気流通方向に沿って延在している。 The straight pipe portion 12 of the embodiment is cylindrical and is formed with the same diameter from the upstream side to the downstream side in the air flow direction (see FIG. 1 or FIG. 2). The straight pipe portion 12 is linearly formed so that the central axis C of the air flow passage 18 defined in the straight pipe portion 12 is a straight line, and constitutes a straight portion of the duct 10. . Here, the central axis C of the duct 10 is an imaginary line that passes through the center of the ventilation cross section that intersects the air flow direction in the air flow passage 18 defined by the shapes of the straight pipe portion 12, the deformation portion 14, and the eccentric portion 16. The air flow passage 18 extends along the air flow direction.

前記変形部１４は、複数(実施例では１３個)の突状部２０を空気流通方向に連ねて構成した伸縮および曲げ変形可能な蛇腹状の部位であって(図１〜図３参照)、直管部１２に合わせた円筒形状を基本形状としている。各突状部２０は、変形部１４の周方向全周に亘って延在して、該変形部１４における空気流通路１８の一部が内部に画成されている。各突状部２０は、変形部１４において空気流通方向と交差する外側(筒形状の径方向外方)に突出する頂部２２で接続されて、空気流通方向に対向する一対の壁部２４,２６から構成されている(図５〜図７参照)。そして、変形部１４は、複数の突状部２０の裾部分同士を接続して構成される。ここで、変形部１４では、突状部２０の頂部２２で囲われる部位が、該変形部１４における空気流通路１８の最大径部となる。これに対して、変形部１４では、隣り合う突状部２０,２０の接続部位である谷部２８で囲われる部位が、該変形部１４における空気流通路１８の最小径部となる。 The deformable portion 14 is a bellows-like portion that can be expanded and contracted and deformed by connecting a plurality (13 in the embodiment) of the protruding portions 20 in the air flow direction (see FIGS. 1 to 3), A cylindrical shape matched to the straight pipe portion 12 is a basic shape. Each projecting portion 20 extends over the entire circumference of the deformable portion 14, and a part of the air flow passage 18 in the deformable portion 14 is defined inside. Each projecting portion 20 is connected by a top portion 22 that protrudes outwardly (in the radially outward direction of the tubular shape) in the deformable portion 14 and intersects the air flow direction, and a pair of wall portions 24 and 26 facing the air flow direction. (Refer to FIGS. 5 to 7). And the deformation | transformation part 14 is comprised by connecting the skirt | hip | mouth parts of the some protruding part 20 mutually. Here, in the deformed portion 14, a portion surrounded by the top portion 22 of the projecting portion 20 is the maximum diameter portion of the air flow passage 18 in the deformed portion 14. On the other hand, in the deformed portion 14, a portion surrounded by the valley portion 28 that is a connecting portion of the adjacent projecting portions 20 and 20 becomes the minimum diameter portion of the air flow passage 18 in the deformed portion 14.

前記変形部１４は、各突状部２０の頂部２２側の所定位置(頂部２２側の変形基点(以下、湾曲変形基点３０という。))および谷部２８側の所定位置(谷部２８側の変形基点)が屈伸変形可能に構成されて、該変形部１４を空気流通方向に伸縮したり、該変形部１４を空気流通方向に交差する方向に曲げることが可能になっている(図７参照)。実施例の突状部２０では、谷部２８側の変形基点が谷部２８に合わせて設けられている。一方、実施例の突状部２０では、湾曲変形基点３０が一方の壁部(実施例では後述する第２壁部２６)の頂部２２側に偏倚した途中部位に設けられている。より具体的には、湾曲変形基点３０は、前記一方の壁部２６における頂部２２の近傍部分において該壁部２６の肉厚と同程度の間隔で該頂部２２から離間した位置に、該壁部２６の全周に亘って延設されている。なお、実施例のダクト１０では、変形部１４の最小径部が直管部１２の直径と同一に設定されている。 The deforming portion 14 includes a predetermined position on the top portion 22 side of each projecting portion 20 (a deformation base point on the top portion 22 side (hereinafter referred to as a curved deformation base point 30)) and a predetermined position on the trough portion 28 side (on the trough portion 28 side). The deformation base point is configured to be able to bend and stretch, and the deformable portion 14 can be expanded and contracted in the air flow direction, or the deformable portion 14 can be bent in a direction intersecting the air flow direction (see FIG. 7). ). In the protruding portion 20 of the embodiment, the deformation base point on the valley portion 28 side is provided in accordance with the valley portion 28. On the other hand, in the protruding portion 20 of the embodiment, the bending deformation base point 30 is provided at a midway portion that is biased toward the top portion 22 side of one wall portion (second wall portion 26 described later in the embodiment). More specifically, the bending deformation base point 30 is located in the vicinity of the top portion 22 of the one wall portion 26 at a position separated from the top portion 22 at a distance similar to the thickness of the wall portion 26. 26 is extended over the entire circumference. In the duct 10 of the embodiment, the minimum diameter portion of the deformable portion 14 is set to be the same as the diameter of the straight pipe portion 12.

図５または図６に示すように、変形部１４の各突状部２０は、頂部２２を空気流通方向に挟んで第１壁部２４および第２壁部２６を備えている。実施例の変形部１４では、ダクト１０の空気流通方向下流側に第１壁部２４が設けられ、ダクト１０の空気流通方向上流側に第２壁部２６が設けられている(図５参照)。すなわち、変形部１４では、第１壁部２４と第２壁部２６とが空気流通方向に交互に配置され、第１壁部２４の裾部分に空気流通方向に隣り合う突状部２０の第２壁部２６の裾部分が接続されて谷部２８を構成している。また、第１壁部２４および第２壁部２６は、図７に示すように、谷部２８から頂部２２に向かって徐々に薄くなるよう形成されている。 As shown in FIG. 5 or FIG. 6, each projecting portion 20 of the deformable portion 14 includes a first wall portion 24 and a second wall portion 26 with the top portion 22 sandwiched in the air flow direction. In the deformation part 14 of an Example, the 1st wall part 24 is provided in the air flow direction downstream of the duct 10, and the 2nd wall part 26 is provided in the air flow direction upstream of the duct 10 (refer FIG. 5). . In other words, in the deformable portion 14, the first wall portions 24 and the second wall portions 26 are alternately arranged in the air flow direction, and the first wall portions 24 of the protrusions 20 adjacent to the hem portion of the first wall portion 24 in the air flow direction are arranged. The bottom part of 2 wall part 26 is connected, and the trough part 28 is comprised. Moreover, the 1st wall part 24 and the 2nd wall part 26 are formed so that it may become thin gradually from the trough part 28 toward the top part 22, as shown in FIG.

図７に示すように、第１壁部２４は、頂部２２と谷部２８とを結んだ直線ラインに沿って延在するように形成され、頂部２２から谷部２８に向けて平坦状になっている。これに対して、第２壁部２６は、頂部２２側に設けられた湾曲変形基点３０と谷部２８との間で湾曲するように形成されて、湾曲変形基点３０と谷部２８とを結んだ直線ラインより該第２壁部２６の湾曲面が突出している。また、突状部２０は、第１壁部２４における頂部２２から谷部２８までの直線距離Ｓ１が、第２壁部２６における頂部２２から谷部２８までの直線距離Ｓ２より長く設定されている。 As shown in FIG. 7, the first wall portion 24 is formed so as to extend along a straight line connecting the top portion 22 and the trough portion 28, and becomes flat from the top portion 22 toward the trough portion 28. ing. On the other hand, the second wall portion 26 is formed so as to bend between the bending deformation base point 30 and the valley portion 28 provided on the top portion 22 side, and connects the bending deformation base point 30 and the valley portion 28. The curved surface of the second wall portion 26 protrudes from the straight line. Further, in the protruding portion 20, the linear distance S1 from the top portion 22 to the trough portion 28 in the first wall portion 24 is set to be longer than the linear distance S2 from the top portion 22 to the trough portion 28 in the second wall portion 26. .

前記第２壁部２６は、湾曲変形基点３０および谷部２８で保持された湾曲面が弾性変形可能に構成されて、該湾曲面の凸側が湾曲変形基点３０と谷部２８とを結ぶ直線ラインを挟んで入れ替わるようになっている(図７参照)。ここで、第２壁部２６は、変形部１４の伸縮または曲げ変形に応じて、該頂部２２で接続する第１壁部２４側へ湾曲面の凸側が突出するよう湾曲した第１状態(図５または図７の２点鎖線参照)に変形される。また、第２壁部２６は、谷部２８で接続する第１壁部２４側へ湾曲面の凸側が突出するよう湾曲(頂部２２で接続する第１壁部２４側と反対側へ突出するよう湾曲)した第２状態(図６または図７の実線参照)に変形される。そして、変形部１４は、第１状態の第２壁部２６によって隣り合う谷部２８同士が近接するよう保持され、第２状態の第２壁部２６によって隣り合う谷部２８同士が離間するよう保持されるようになっている。このように、変形部１４は、曲がった状態で自己保持可能に構成される。すなわち、ダクト１０は、車両への取り付け時に設定された湾曲部分１０ａの曲がり角度θを、支持金具等を別途用いることなく適切に維持し得る。なお、第２状態に変形した第２壁部２６は、図６に示すように、同一中心で湾曲変形基点３０および谷部２８を通る半径Ｍの球面の一部をなす曲面形状になっている。 The second wall portion 26 is configured such that the curved surface held by the curved deformation base point 30 and the valley portion 28 can be elastically deformed, and the convex side of the curved surface connects the curved deformation base point 30 and the valley portion 28. Are interchanged (see FIG. 7). Here, the second wall portion 26 is curved in a first state in which the convex side of the curved surface protrudes toward the first wall portion 24 connected at the top portion 22 in accordance with the expansion or contraction or bending deformation of the deformation portion 14 (FIG. 5 or a two-dot chain line in FIG. 7). The second wall portion 26 is curved so that the convex side of the curved surface protrudes toward the first wall portion 24 side connected at the valley portion 28 (so as to protrude opposite to the first wall portion 24 side connected at the top portion 22. The second state is bent (see the solid line in FIG. 6 or 7). And the deformation | transformation part 14 is hold | maintained so that the adjacent trough parts 28 may adjoin by the 2nd wall part 26 of a 1st state, and the adjacent trough parts 28 are spaced apart by the 2nd wall part 26 of a 2nd state. It is supposed to be retained. Thus, the deformation | transformation part 14 is comprised so that self-holding is possible in the bent state. That is, the duct 10 can appropriately maintain the bending angle θ of the curved portion 10a set at the time of attachment to the vehicle without separately using a support fitting or the like. In addition, the 2nd wall part 26 deform | transformed into the 2nd state becomes a curved surface shape which makes a part of spherical surface of the radius M which passes along the curved deformation | transformation origin 30 and the trough part 28 in the same center, as shown in FIG. .

実施例のダクト１０では、取り付け対象に合わせて変形部１４の曲がり方向が予め設定されている。そして、実施例の変形部１４は、曲がりの内側となる部位(曲がりの凹側)が曲がりの外側(曲がりの凸側)となる部位と比べて肉厚が薄く形成されている。これにより、曲げた変形部１４の曲げ変形状態の保持性を向上することができる。 In the duct 10 of the embodiment, the bending direction of the deformable portion 14 is set in advance according to the attachment target. And the deformation | transformation part 14 of an Example is formed thinly compared with the site | part from which the site | part which becomes the inner side of a curve (the concave side of a curve) becomes the outer side of a curve (the convex side of a curve). Thereby, the retention property of the bending deformation state of the bending deformation part 14 can be improved.

前記ダクト１０において、偏心部１６は、直管部１２と変形部１４とを接続する部位であって(図１参照)、直管部１２および変形部１４に合わせて円筒形状に形成されている。偏心部１６は、直管部１２への接続端が直管部１２の直径と同じに形成されると共に、変形部１４への接続端が該変形部１４の最小径部と同じに形成されている。また、偏心部１６は、空気流通方向上流側から下流側の全体に亘って同一の径で形成されている。すなわち、実施例のダクト１０は、空気流通方向上流側の開口端から下流側の開口端までに亘って、変形部１４の突状部を除いて直管部１２の直径と同一のダクト径Ｄを基本として形成されている。更に、実施例のダクト１０では、変形部１４の空気流通方向に離間する両端に偏心部１６が夫々設けられており、変形部１４の直線状態において該変形部１４を挟んで設けられた一対の直管部１２,１２の中心軸線Ｃが同一直線状に位置するよう構成される。 In the duct 10, the eccentric portion 16 is a portion that connects the straight pipe portion 12 and the deformable portion 14 (see FIG. 1), and is formed in a cylindrical shape according to the straight pipe portion 12 and the deformable portion 14. . The eccentric portion 16 has a connection end to the straight pipe portion 12 that is the same as the diameter of the straight pipe portion 12, and a connection end to the deformation portion 14 that is the same as the minimum diameter portion of the deformation portion 14. Yes. The eccentric portion 16 is formed with the same diameter from the upstream side to the downstream side in the air flow direction. That is, the duct 10 of the embodiment has a duct diameter D that is the same as the diameter of the straight pipe portion 12 except for the projecting portion of the deformable portion 14 from the upstream opening end to the downstream opening end in the air flow direction. It is formed on the basis. Further, in the duct 10 according to the embodiment, the eccentric portions 16 are provided at both ends of the deformable portion 14 that are separated from each other in the air flow direction, and a pair of the deformable portions 14 provided with the deformable portion 14 interposed therebetween in a linear state. The straight axes 12 and 12 are configured such that the central axes C of the straight pipe portions 12 and 12 are positioned on the same straight line.

前記偏心部１６は、変形部１４における該偏心部１６との接続部位の通風断面を、直管部１２における該偏心部１６との接続部位の通風断面に対して、該変形部１４の曲がりの内側となる側へずらすように繋いでいる(図２または図４参照)。すなわち、偏心部１６は、直管部１２との接続部位から変形部１４との接続部位に向かうにつれて、変形部１４の曲がりの内側となる側へ中心軸線Ｃが傾くように形成されている(図２または図３参照)。実施例では、偏心部１６が直管部１２との接続部位から変形部１４との接続部位に向かうにつれて、変形部１４の曲がりの内側となる側が凹になるように湾曲形成されている。 The eccentric portion 16 is configured such that the deformation section 14 has a ventilation cross section at the connection portion with the eccentric portion 16 with respect to the ventilation cross section at the connection portion with the eccentric portion 16 in the straight pipe portion 12. They are connected so as to be shifted to the inner side (see FIG. 2 or FIG. 4). That is, the eccentric portion 16 is formed such that the central axis C is inclined toward the inner side of the bending of the deforming portion 14 as it goes from the connecting portion with the straight pipe portion 12 to the connecting portion with the deforming portion 14 ( (See FIG. 2 or FIG. 3). In the embodiment, the eccentric portion 16 is curved so that the inner side of the bending of the deforming portion 14 becomes concave as it goes from the connecting portion with the straight pipe portion 12 to the connecting portion with the deforming portion 14.

前記ダクト１０では、前述の如く変形部１４および偏心部１６により湾曲部分１０ａが構成される。そして、ダクト１０では、空気流通方向上流側の直管部１２と空気流通方向下流側の直管部１２との間に湾曲部分１０ａの曲がり角度θに応じて規定される曲率を小さく(曲率半径を大きく)するのが、圧力損失低減の観点から好ましい。すなわち、ダクト１０では、変形部１４を曲げた状態において、空気流通方向上流側の直管部１２の接続部位から変形部１４の曲がりの内側に伸ばしたラインと空気流通方向下流側の直管部１２の接続部位から変形部１４の曲がりの内側に伸ばしたラインとが交差する交差点を中心として、該交差点から直管部１２の接続部位を通る中心軸線Ｃまでを半径とする円弧に対して、偏心部１６および変形部１４の中心軸線Ｃが整合または近似する関係に設定するのがよい(図４参照)。そして、ダクト１０では、ダクト径Ｄ、湾曲部分１０ａの曲がり角度θ、直管部１２の接続部位とこの直管部１２の接続部位に偏心部１６を挟んで向かい合う変形部１４の接続部位との水平距離(以下、偏心距離Ｌという。)および直管部１２の中心軸線Ｃと直線状態にある変形部１４の中心軸線Ｃとの間のずれ寸法(以下、偏心度Ｅという。)等の諸条件を勘案して、湾曲部分１０ａが構成される(図２または図４参照)。 In the duct 10, the curved portion 10 a is configured by the deformable portion 14 and the eccentric portion 16 as described above. In the duct 10, the curvature defined according to the bending angle θ of the curved portion 10 a is reduced between the straight pipe portion 12 on the upstream side in the air flow direction and the straight pipe portion 12 on the downstream side in the air flow direction (the radius of curvature). Is preferable from the viewpoint of reducing pressure loss. That is, in the duct 10, in a state where the deformed portion 14 is bent, a line extending from the connection portion of the straight pipe portion 12 on the upstream side in the air flow direction to the inside of the bend of the deformable portion 14 and the straight pipe portion on the downstream side in the air flow direction. With respect to an arc having a radius from the intersection to the central axis C passing through the connection portion of the straight pipe portion 12 around the intersection where the line extending from the connection portion of 12 to the inside of the bend of the deformable portion 14 intersects, The center axis C of the eccentric part 16 and the deforming part 14 is preferably set so as to match or approximate (see FIG. 4). In the duct 10, the duct diameter D, the bending angle θ of the curved portion 10 a, the connection portion of the straight pipe portion 12, and the connection portion of the deformable portion 14 facing each other with the eccentric portion 16 sandwiched between the connection portion of the straight pipe portion 12. Various factors such as a horizontal distance (hereinafter referred to as an eccentric distance L) and a displacement dimension (hereinafter referred to as an eccentricity E) between the central axis C of the straight pipe portion 12 and the central axis C of the deformed portion 14 in a straight state. In consideration of the conditions, the curved portion 10a is configured (see FIG. 2 or FIG. 4).

(実施例の作用)
前記ダクト１０では、直線状態における変形部１４の中心軸線Ｃが、直管部１２の中心軸線Ｃに対して該変形部１４の曲がりの内側となる側へ偏心部１６,１６によってずらされいるので、変形部１４が直管部１２に対して曲がりの内側とする側へ突出している(図２参照)。すなわち、ダクト１０は、外観から変形部１４を曲げる方向が判り易いので、車両への取り付け作業性がよく、取り付け効率を向上することができる。また、ダクト１０は、湾曲部分１０ａが予め形成されるものと異なり、該ダクト１０の取り付け時に変形部１４を曲げて湾曲部分１０ａを形成している。従って、ダクト１０は、変形部１４を直線的に伸ばした状態で搬送や保管等において取り扱うことができ、取り扱い易く、例えば運搬において多量に搬送することが可能であるので運搬コストを低減できる。 (Operation of Example)
In the duct 10, the central axis C of the deformable portion 14 in the straight state is shifted by the eccentric portions 16, 16 toward the inner side of the bend of the deformable portion 14 with respect to the central axis C of the straight pipe portion 12. The deformable portion 14 protrudes toward the side of the bend with respect to the straight tube portion 12 (see FIG. 2). That is, since the duct 10 can easily understand the direction in which the deformed portion 14 is bent from the appearance, it can be easily attached to the vehicle and can improve the attachment efficiency. Further, unlike the duct 10 in which the curved portion 10a is formed in advance, the deformed portion 14 is bent to form the curved portion 10a when the duct 10 is attached. Therefore, the duct 10 can be handled in transportation, storage, etc. with the deformed portion 14 linearly extended, and is easy to handle. For example, it can be transported in large quantities during transportation, so that transportation costs can be reduced.

前記ダクト１０では、変形部１４を、直管部１２から空気流通方向に交差する方向に突出した側を内にして曲げることで、変形部１４および偏心部１６,１６によって湾曲部分１０ａが構成される(図１参照)。ダクト１０は、湾曲部分１０ａの曲がり角度θが同一であれば、変形部１４のみで湾曲部分を構成する場合と変形部１４の曲がり角度が変わらない。しかしながら、実施例のダクト１０によれば、変形部１４のみで湾曲部分を構成する場合と比べて、湾曲部分１０ａの曲がり角度θが同一であっても、偏心部１６が変形部１４と直管部１２との間で湾曲部分１０ａの一部を構成するので、湾曲部分１０ａの曲率半径を大きくできると共に、湾曲部分１０ａの曲率を全体として小さくすることができる(図４参照)。なお、図４では、実施例と同一の変形部を有する従来例で説明したダクト８０を破線で示している。このように、ダクト１０では、湾曲部分１０ａで画成される空気流通路１８の曲率を小さくし得るので、湾曲部分１０ａの空気流通路１８において曲がりの内側から気流が剥離して、曲がりの外側に気流が集中することを抑制することができる。すなわち、空気流通路１８において、気流の偏在を抑制することで、該空気流通路１８の断面積全体を気流が通過する空間として有効利用することができる。また、湾曲部分１０ａの空気流通路１８において、曲がりの空気流通方向下流側において旋回流の発生を抑えることができ、該空気流通路１８における気流の圧力損失を低減できる。従って、実施例のダクト１０によれば、湾曲部分１０ａを設けて車両に取り付けても該湾曲部分１０ａに起因する圧力損失を低減し得るので、通風性能を改善することができる。 In the duct 10, the bending portion 10 a is configured by the deformation portion 14 and the eccentric portions 16, 16 by bending the deformation portion 14 with the side protruding from the straight pipe portion 12 in the direction intersecting the air flow direction. (See FIG. 1). In the duct 10, if the bending angle θ of the curved portion 10 a is the same, the bending angle of the deformable portion 14 does not change from the case where the curved portion is configured by only the deformable portion 14. However, according to the duct 10 of the embodiment, as compared with the case where the curved portion is configured by only the deformable portion 14, the eccentric portion 16 and the straight portion 16 are straight even if the curved portion 10 a has the same bending angle θ. Since a portion of the curved portion 10a is formed with the portion 12, the radius of curvature of the curved portion 10a can be increased and the curvature of the curved portion 10a can be reduced as a whole (see FIG. 4). In FIG. 4, the duct 80 described in the conventional example having the same deformation portion as that of the embodiment is indicated by a broken line. Thus, in the duct 10, the curvature of the air flow passage 18 defined by the curved portion 10 a can be reduced, so that the air flow is separated from the inside of the bend in the air flow passage 18 of the curved portion 10 a, and the outside of the bend. It is possible to suppress the airflow from concentrating on. That is, by suppressing the uneven distribution of the airflow in the airflow passage 18, the entire cross-sectional area of the airflow passage 18 can be effectively used as a space through which the airflow passes. Further, in the air flow passage 18 of the curved portion 10a, the generation of the swirling flow can be suppressed on the downstream side in the air flow direction of the curve, and the pressure loss of the air flow in the air flow passage 18 can be reduced. Therefore, according to the duct 10 of the embodiment, even if the curved portion 10a is provided and attached to the vehicle, the pressure loss due to the curved portion 10a can be reduced, so that the ventilation performance can be improved.

前記偏心部１６は、直管部１２との接続端から変形部１４との接続端に向かうにつれて、該変形部１４の曲がりの内側となる側が凹となるように湾曲しているので、ダクト１０の湾曲部分１０ａの曲面を滑らかにすることができ、当該湾曲部分１０ａでの圧力損失をより低減することができる。また、ダクト１０では、変形部１４の両側に偏心部１６を設けることで、変形部１４および２つの偏心部１６,１６とから構成される湾曲部分１０ａの曲率をより小さくすることができるので、当該湾曲部分１０ａでの圧力損失を更に低減することができる。 The eccentric portion 16 is curved so that the inner side of the bending of the deforming portion 14 becomes concave as it goes from the connecting end with the straight pipe portion 12 to the connecting end with the deforming portion 14. The curved surface of the curved portion 10a can be smoothed, and the pressure loss at the curved portion 10a can be further reduced. Further, in the duct 10, by providing the eccentric portions 16 on both sides of the deformable portion 14, the curvature of the curved portion 10a formed by the deformable portion 14 and the two eccentric portions 16, 16 can be further reduced. The pressure loss in the curved portion 10a can be further reduced.

前記ダクト１０は、各突状部２０の周方向における同一位置を空気流通方向において縮閉すると共に、該変形部１４の径方向において縮閉位置と対向する部位を空気流通方向へ伸ばして拡開することで、変形部１４を適宜の曲がり角度の扇状に変形し得る。ここで、第２壁部２６の第１状態から第２状態への変形および第２状態から第１状態への変形は、谷部２８を介して連設された隣接する突状部２０の第１壁部２４により発現する。すなわち、図５に示すように、各突状部２０が空気流通方向において両側から押されると、頂部２２と谷部２８とがダクト１０の内外方向においてオーバーラップして各谷部２８が近接する。このとき、第２壁部２６の湾曲形状は、該第２壁部２６の谷部２８で連設された第１壁部２４側から、該第２壁部２６の頂部２２で連設された第１壁部２４側へ反転(変形)する。このように、各第２壁部２６が第１状態に保持されると、各谷部２８が近接した状態に保持される。 The duct 10 contracts the same position in the circumferential direction of each projecting portion 20 in the air flow direction, and expands a portion facing the contracted position in the radial direction of the deformation portion 14 in the air flow direction. By doing so, the deformation | transformation part 14 can be deform | transformed in the fan shape of a suitable bending angle. Here, the deformation of the second wall portion 26 from the first state to the second state and the deformation from the second state to the first state are the same as those of the adjacent projecting portions 20 provided continuously through the valley portions 28. 1 wall 24 expresses. That is, as shown in FIG. 5, when each projecting portion 20 is pushed from both sides in the air flow direction, the top portion 22 and the valley portion 28 overlap each other in the inside and outside direction of the duct 10, and each valley portion 28 approaches. . At this time, the curved shape of the second wall portion 26 was continuously provided at the top portion 22 of the second wall portion 26 from the first wall portion 24 side continuously provided at the valley portion 28 of the second wall portion 26. It reverses (deforms) toward the first wall 24 side. Thus, when each 2nd wall part 26 is hold | maintained in a 1st state, each trough part 28 will be hold | maintained in the state which adjoined.

一方、縮められた変形部１４は、図６に示すように、空気流通方向において両側へ引張ると谷部２８が空気流通方向へ離間するようになる。このとき、第２壁部２６の湾曲形状は、該第２壁部２６の頂部２２で連設された第１壁部２４側から、該第２壁部２６の谷部２８で連設された第１壁部２４側へ反転(変形)する。このように、各第２壁部２６が第２状態に保持されると、各谷部２８が離間した状態に保持される。 On the other hand, as shown in FIG. 6, when the contracted deformed portion 14 is pulled to both sides in the air flow direction, the valley portion 28 is separated in the air flow direction. At this time, the curved shape of the second wall portion 26 was continuously provided at the valley portion 28 of the second wall portion 26 from the first wall portion 24 side continuously provided at the top portion 22 of the second wall portion 26. It reverses (deforms) toward the first wall 24 side. Thus, if each 2nd wall part 26 is hold | maintained in a 2nd state, each trough part 28 will be hold | maintained in the separated state.

前記変形部１４は、曲げた際に、各突状部２０の周方向において曲がりの内側に位置する第２壁部２６が第１状態に変形して隣り合う谷部２８同士が近接した状態に保持されるので、各突状部２０の当該部位は縮閉した状態で保持される。また、変形部１４は、各突状部２０の周方向において曲がりの外側に位置する第２壁部２６が第２状態に変形して隣り合う谷部２８同士が離間した状態に保持されるので、各突状部２０の当該部位は拡開した状態で保持される。このように、ダクト１０は、変形部１４を曲げた状態で形状保持できる。従って、ダクト１０は、変形部１４を伸縮状態だけでなく折り曲げた状態でも保持できるので、ダクト１０を所定位置に配設するに先立って変形部１４を予め所要の形状に変形させておくことができ、ダクト１０の取付作業の簡易化を図り得る。 When the deforming portion 14 is bent, the second wall portion 26 located inside the bend in the circumferential direction of each protruding portion 20 is deformed to the first state, and the adjacent valley portions 28 are close to each other. Since it is hold | maintained, the said site | part of each protrusion-like part 20 is hold | maintained in the contracted state. Moreover, since the deformation | transformation part 14 is hold | maintained in the state where the 2nd wall part 26 located in the outer side of a curve in the circumferential direction of each protrusion-like part 20 deform | transforms into a 2nd state, and the adjacent trough parts 28 have separated. In addition, the portion of each protrusion 20 is held in an expanded state. Thus, the duct 10 can maintain the shape with the deformed portion 14 being bent. Therefore, the duct 10 can hold the deformed portion 14 not only in the expanded / contracted state but also in a bent state. Therefore, the deformable portion 14 can be deformed in advance into a required shape prior to disposing the duct 10 at a predetermined position. It is possible to simplify the installation work of the duct 10.

前記変形部１４は、各突状部２０の壁部２４,２６の頂部２２側を薄く形成し、また突状部２０における曲がりの内側となる部位が曲がりの外側となる部位より薄肉に形成されているので、突状部２０同士を縮閉する曲がりの内側部位を変形させ易く、突状部２０同士を拡開する曲がりの外側部位において形状保持性を向上することができる。また、突状部２０では、隣り合う谷部２８同士が離間している状態(図７の実線表示)において、湾曲変形基点３０が頂部２２より内側(ダクト１０の径方向中心側)に位置していおり、頂部２２と湾曲変形基点３０との間隔が、第２壁部２６の湾曲変形基点３０近傍の肉厚と同程度となっている。これにより、第２壁部２６は、第１状態および第２状態に変形し易くなり、図７に２点鎖線で示すように、第１状態に変形した第２壁部２６が、頂部２２で接続する第１壁部２４への干渉が防止される。従って、変形部１４は、複数の突状部２０が縮閉した状態と拡開した状態とに容易に変形すると共に、何れの状態に変形しても第２壁部２６の反対状態への復元力が発現し難くいので、変形した状態に適切に保持される。 The deformed portion 14 is formed so that the top portion 22 side of the wall portions 24 and 26 of each projecting portion 20 is thin, and a portion of the projecting portion 20 on the inside of the bend is formed thinner than a portion on the outside of the bend. Therefore, it is easy to deform the inner part of the bend that contracts and closes the protruding parts 20, and the shape retainability can be improved at the outer part of the bend that expands the protruding parts 20. Further, in the protruding portion 20, the bending deformation base point 30 is located on the inner side (the radial center side of the duct 10) than the top portion 22 in a state where the adjacent valley portions 28 are separated from each other (shown by a solid line in FIG. 7). In addition, the distance between the top portion 22 and the bending deformation base point 30 is approximately the same as the thickness of the second wall portion 26 near the bending deformation base point 30. Thereby, the 2nd wall part 26 becomes easy to deform | transform into a 1st state and a 2nd state, and as shown by the dashed-two dotted line in FIG. Interference with the first wall 24 to be connected is prevented. Therefore, the deforming portion 14 is easily deformed into a state where the plurality of projecting portions 20 are contracted and expanded, and the second wall portion 26 is restored to the opposite state regardless of which state is deformed. Since it is difficult to develop force, it is appropriately held in a deformed state.

前述した実施例のダクト１０の製造方法について簡単に説明する。ブロー成形型は、変形部１４が直線状態で、かつ伸ばされた状態にあるダクト１０の外形に合わせて形成されている。先ず、ポリエチレン(ＰＥ)またはポリプロピレン(ＰＰ)等の熱可塑性樹脂を材質とするチューブ状のパリソンを、ぶら下げるようにブロー成形型にセットする。この際、パリソンは、直管部１２の中心軸線Ｃに合わせてブロー成形型にセットされるので、該ブロー成形型の変形部１４に対応する部位においてパリソンが変形部１４の曲がりの外側となる側に偏倚して配置される。そして、ブロー成形型を閉めた後，コンプレッサーから圧縮空気をパリソンに吹き込んむとパリソンが膨らみ、パリソンにおける変形部１４の曲がりの外側になる部位がブロー成形型の内面に先に当たり、パリソンにおける変形部１４の曲がりの内側になる部位がブロー成形型の内面に遅れて当たる。すなわち、ブロー成形型に後に当たる変形部１４の曲がりの内側となる部位が、ブロー成形型に先に当たる変形部１４の曲がりの外側となる部位と比べて薄肉に形成される。なお、パリソンにおける直管部１２となる部位は、ブロー成形型の内面に当たるタイミングがほぼ同じなので全周の肉厚がほぼ同じになる。このように、前述したダクト１０の製造方法によれば、変形部１４の肉厚を曲がりの内外で簡単に調節することができ、直管部１２、変形部１４および偏心部１６が一体形成されたダクト１０を得られる。 A method for manufacturing the duct 10 of the above-described embodiment will be briefly described. The blow mold is formed in conformity with the outer shape of the duct 10 in which the deformable portion 14 is in a straight line and extended. First, a tubular parison made of a thermoplastic resin such as polyethylene (PE) or polypropylene (PP) is set in a blow mold so as to hang. At this time, since the parison is set in the blow molding die in accordance with the central axis C of the straight pipe portion 12, the parison is outside the bending of the deformation portion 14 at a portion corresponding to the deformation portion 14 of the blow molding die. It is biased to the side. Then, after the blow mold is closed, when the compressed air is blown into the parison from the compressor, the parison expands, and the portion that is outside the curve of the deformed portion 14 in the parison first hits the inner surface of the blow mold, and the deformed portion 14 in the parison. The part which becomes the inside of the bend hits the inner surface of the blow mold with a delay. That is, the portion that is the inside of the bending portion of the deformable portion 14 that contacts the blow molding die is formed thinner than the portion that is the outside of the bending portion of the deforming portion 14 that contacts the blow molding die. In addition, since the site | part used as the straight pipe part 12 in a parison has the substantially same timing which hits the inner surface of a blow molding die, the thickness of a perimeter is substantially the same. Thus, according to the manufacturing method of the duct 10 described above, the thickness of the deformable portion 14 can be easily adjusted inside and outside the bend, and the straight pipe portion 12, the deformable portion 14, and the eccentric portion 16 are integrally formed. Duct 10 is obtained.

(通風実験)
実施例で説明した偏心部および変形部からなる湾曲部分を有するダクトと、従来技術で説明した変形部のみからなる湾曲部分を有するダクトとの解析モデルを作成し、直管部の中心軸線と直線状態にある変形部の中心軸線との間のずれ寸法である偏心度Ｅおよび湾曲部分の曲がり角度θの条件を変えて、通風性をコンピュータ上での解析により検証した。実験例および参考例のダクトは、変形部１４の両側に偏心部１６,１６が設けられると共に、各偏心部１６の変形部１４との接続側と反対に直管部１２が夫々設けられ、変形部１４および該変形部１４を挟む２つの偏心部１６,１６から湾曲部分１０ａが構成されている(図８参照)。比較例のダクトは、変形部の両側に直管部が設けられ、変形部だけにより湾曲部分が構成されている。実験例、参考例および比較例のダクトは、湾曲部分を１ヶ所のみ設けており、変形部の構成(突状部の数や形状)は同一である。 (Ventilation experiment)
An analysis model of a duct having a curved portion composed of an eccentric portion and a deformed portion described in the embodiment and a duct having a curved portion composed only of the deformed portion described in the prior art is created, and a straight line and a central axis of the straight pipe portion Ventilation was verified by analysis on a computer while changing the conditions of the eccentricity E, which is a deviation dimension from the central axis of the deformed portion in the state, and the bending angle θ of the curved portion. The ducts of the experimental example and the reference example are provided with the eccentric portions 16 and 16 on both sides of the deformable portion 14, and the straight pipe portion 12 is provided on the opposite side to the connection side of each eccentric portion 16 with the deformable portion 14. The curved part 10a is comprised from the two eccentric parts 16 and 16 which pinch | interpose the part 14 and this deformation | transformation part 14 (refer FIG. 8). In the duct of the comparative example, straight pipe portions are provided on both sides of the deformable portion, and a curved portion is configured only by the deformable portion. The ducts of the experimental example, the reference example, and the comparative example are provided with only one curved portion, and the configuration of the deforming portion (the number and shape of the protruding portions) is the same.

実験例および参考例のダクトでは、変形部１４の空気流通方向上流側に位置する直管部１２の長さＮ１(空気の流入口から変形部１４の空気流通方向上流側に位置する偏心部１６の偏心起点までの寸法)を２７０ｍｍに設定すると共に、変形部１４の空気流通方向下流側に位置する直管部１２の長さＮ２(変形部１４の空気流通方向下流側に位置する偏心部１６の偏心起点から流出口までの寸法)を１５０ｍｍとした(図８参照)。また、実験例、参考例および比較例のダクトは、直管部の内径を７３ｍｍ、偏心部の内径を７３ｍｍ、変形部の最大径部の内径を８３ｍｍ、変形部の最小径部の内径を７３ｍｍに設定した。すなわち、実験例、参考例および比較例では、ダクト径Ｄを７３ｍｍに設定した。 In the ducts of the experimental example and the reference example, the length N1 of the straight pipe portion 12 located on the upstream side in the air flow direction of the deformation portion 14 (the eccentric portion 16 located on the upstream side in the air flow direction of the deformation portion 14 from the air inlet port). Is set to 270 mm, and the length N2 of the straight pipe portion 12 located downstream of the deformable portion 14 in the air flow direction (the eccentric portion 16 located downstream of the deformable portion 14 in the air flow direction). The dimension from the eccentric starting point to the outlet is 150 mm (see FIG. 8). The ducts of the experimental example, the reference example, and the comparative example have an inner diameter of the straight pipe portion of 73 mm, an inner diameter of the eccentric portion of 73 mm, an inner diameter of the maximum diameter portion of the deformation portion of 83 mm, and an inner diameter of the minimum diameter portion of the deformation portion of 73 mm. Set to. That is, in the experimental example, the reference example, and the comparative example, the duct diameter D was set to 73 mm.

実験例、参考例および比較例のダクトでは、９０°の湾曲部分１０ａを構成する変形部１４の突状部数を１３個とし(図９(ａ)参照)、７５°の湾曲部分１０ａを構成する変形部１４の突状部数を１１個とし(図９(ｂ)参照)、６０°の湾曲部分１０ａを構成する変形部１４の突状部数を９個とし(図９(ｃｂ)参照)、４５°の湾曲部分１０ａを構成する変形部１４の突状部数を７個とし(図９(ｄ)参照)、３０°の湾曲部分１０ａを構成する変形部１４の突状部数を５個とした(図９(ｅ)参照)。変形部１４は、谷部を互いに離間した伸ばした状態において、突状部２０の１ピッチの寸法Ｔが１０ｍｍに設定されている(図８参照)。また、実験例および参考例のダクトでは、直管部１２の接続部位とこの直管部１２の接続部位に偏心部１６を挟んで向かい合う変形部１４の接続部位との水平距離である偏心距離Ｌを、直管部１２の内径と同じ７３ｍｍに設定してある(図８参照)。比較例のダクトは、変形部の空気流通方向上流側に位置する直管部１２の長さを３４３ｍｍ(実験例の対応する直管部の長さ＋ダクト径Ｄ)に設定すると共に、変形部の空気流通方向下流側に位置する直管部の長さを２２３ｍｍ(実験例の対応する直管部の長さ＋ダクト径Ｄ)とした。更に、実験例、参考例および比較例では、ダクトの一端から空気を１６８ｍ^３／ｈの流量で吹き込み、ダクトの他端から大気圧０の疑似大気空間に空気を吹き出す解析モデルを設定した。ここで、実験例１では、偏心度Ｅをダクト径Ｄの１／８の寸法(１／８Ｄ)に設定し、実験例２では、偏心度Ｅをダクト径Ｄの２／８の寸法(２／８Ｄ)に設定した。また、参考例１では、偏心度Ｅをダクト径Ｄの３／８の寸法(３／８Ｄ)に設定し、参考例２では、偏心度Ｅをダクト径Ｄの４／８の寸法(４／８Ｄ)に設定した。そして、実験例、参考例および比較例のダクトにおいて、湾曲部分の曲がり角度θ(３０°,４５°,６０°,７５°,９０°)を変えて、圧力損失(単位：Ｐａ)を算出した。この結果を以下の表１に示す。 In the ducts of the experimental example, the reference example, and the comparative example, the number of projecting portions 14 of the deformable portion 14 constituting the 90 ° curved portion 10a is 13 (see FIG. 9A), and the 75 ° curved portion 10a is configured. The number of projecting portions of the deforming portion 14 is 11 (see FIG. 9B), the number of projecting portions of the deforming portion 14 constituting the 60 ° curved portion 10a is 9 (see FIG. 9C), 45 The number of projecting portions of the deformable portion 14 constituting the curved portion 10a of 7 ° is 7 (see FIG. 9D), and the number of projecting portions of the deformable portion 14 constituting the curved portion 10a of 30 ° is 5 (see FIG. 9D). (See FIG. 9 (e)). In the deformed portion 14, the dimension T of one pitch of the protruding portion 20 is set to 10 mm in a state where the valley portions are extended apart from each other (see FIG. 8). Further, in the ducts of the experimental example and the reference example, the eccentric distance L that is the horizontal distance between the connecting portion of the straight pipe portion 12 and the connecting portion of the deformable portion 14 facing the connecting portion of the straight pipe portion 12 with the eccentric portion 16 interposed therebetween. Is set to 73 mm, which is the same as the inner diameter of the straight pipe portion 12 (see FIG. 8). In the duct of the comparative example, the length of the straight pipe portion 12 located on the upstream side of the deformation portion in the air flow direction is set to 343 mm (the length of the corresponding straight pipe portion in the experimental example + duct diameter D), and the deformation portion The length of the straight pipe portion located on the downstream side in the air flow direction was 223 mm (the length of the corresponding straight pipe portion in the experimental example + the duct diameter D). Furthermore, experimental examples, the reference examples and comparative examples, the air from one end of the duct blowing at a flow rate of 168 m 3 / ^h, were set an analysis model for blowing air into the pseudo-air space of the atmospheric pressure 0 from the other end of the duct. Here, in Experimental Example 1, the eccentricity E is set to a size (1 / 8D) that is 1/8 of the duct diameter D, and in Experimental Example 2, the eccentricity E is set to a dimension that is 2/8 of the duct diameter D (2 / 8D). Further, in the reference example 1, the eccentricity E is set to the dimension 3/8 of the duct diameter D (3 / 8D), and in the reference example 2, the eccentricity E is set to the dimension 4/8 of the duct diameter D (4 / 8D). In the ducts of the experimental example, the reference example, and the comparative example, the pressure loss (unit: Pa) was calculated by changing the bending angle θ (30 °, 45 °, 60 °, 75 °, 90 °) of the curved portion. . The results are shown in Table 1 below.

表１によれば、前述したダクト径Ｄおよび偏心距離Ｌ等の条件のもとで、実験例１および実験例２では、全ての曲がり角度θにおいて比較例より圧力損失が低減することが確認された。また、通風性能改善効果は、ダクトの湾曲部分の曲がり角度θが大きくなるのに従って大きくなり、参考例１であっても、４５°以上の曲がり角度であれば比較例と比べて圧力損失を低減できる。更に、実験例および参考例より判るように、比較例から偏心度Ｅを大きくしていくのにつれて圧力損失が低減していくが、偏心度Ｅがある値を越えると圧力損失が増加する。前述したダクト径Ｄおよび偏心距離Ｌ等の条件であっては、実験例２の条件が圧力損失を最も低減できる。すなわち、実験例２のダクトでは、空気流通方向上流側の直管部と空気流通方向下流側の直管部との間に理想的な中心軸線に対し、偏心部および変形部の中心軸線が近似していると考えられる。 According to Table 1, under the conditions such as the duct diameter D and the eccentric distance L described above, it is confirmed that in Experimental Examples 1 and 2, the pressure loss is reduced as compared with the comparative example at all the bending angles θ. It was. The effect of improving the ventilation performance increases as the bending angle θ of the curved portion of the duct increases, and even in the reference example 1, if the bending angle is 45 ° or more, the pressure loss is reduced compared to the comparative example. it can. Further, as can be seen from the experimental example and the reference example, the pressure loss decreases as the eccentricity E increases from the comparative example, but the pressure loss increases when the eccentricity E exceeds a certain value. Under the conditions such as the duct diameter D and the eccentric distance L described above, the pressure loss can be reduced most by the condition of Experimental Example 2. That is, in the duct of Experimental Example 2, the center axis of the eccentric part and the deformed part approximates the ideal center axis between the straight pipe part upstream of the air flow direction and the straight pipe part downstream of the air flow direction. it seems to do.

(変更例)
本願が対象とするダクトは、前述した実施例の形態に限定されず、様々な変更可能である。
(１)実施例では、変形部の突状部を除く直管部、変形部の谷部および偏心部を同一のダクト径で形成したが、直管部における偏心部に接続する接続部位、変形部の谷部および偏心部を同一のダクト径で形成し、直管部の途中部分やエアアウトレット等への接続側を拡開したり、縮径したりしてもよい。
(２)湾曲変形基点の形成位置は、頂部から第２壁部の肉厚と同程度の間隔で離間した位置に限定されず、第１状態に変形した第２壁部が該第１状態に保持され得れば、頂部との間隔を、第２壁部の肉厚より小さく設定してもよいし、第２壁部の肉厚より大きく設定してもよい。
(３)湾曲変形基点を、頂部と一致させてもよい。この場合、第２壁部は、全体が湾曲して第１状態および第２状態に変形するようになる。
(４)実施例では、９０度に曲がる湾曲部を例示したが、変形部における突状部の配設数等を変更することで、９０度以下または９０度以上に曲がるよう構成することも可能である。
(５)ダクトは、円筒形状に限らず、四角形や五角形等の角筒形状であってもよい。
(６)本願が対象とするダクトは、自動車に配設されるものに限らず、これ以外の車両や建物等に配設されるものも対象とされる。
(７)実施例では、変形部として曲げた状態で自己保持可能な構成を例に挙げたが、これに限定されず、ダクトを車両に対して取り付ける支持金具で変形部を曲げた状態に保持してもよい。
(８)変形部が曲げた状態で自己保持する構成は、実施例の例に限定されず、その他の構成を採用し得る。 (Example of change)
The duct targeted by the present application is not limited to the embodiment described above, and various modifications can be made.
(1) In the embodiment, the straight pipe part excluding the projecting part of the deforming part, the valley part of the deforming part and the eccentric part are formed with the same duct diameter, but the connecting part connected to the eccentric part in the straight pipe part, the deformation The trough part and the eccentric part of the part may be formed with the same duct diameter, and the connecting part to the middle part of the straight pipe part, the air outlet, or the like may be expanded or reduced in diameter.
(2) The formation position of the bending deformation base point is not limited to a position spaced from the top portion at the same interval as the thickness of the second wall portion, and the second wall portion deformed to the first state is in the first state. If it can be held, the distance from the top may be set smaller than the thickness of the second wall or larger than the thickness of the second wall.
(3) The bending deformation base point may coincide with the top. In this case, the entire second wall portion is curved and deforms into the first state and the second state.
(4) In the embodiment, the curved portion that bends at 90 degrees has been exemplified, but it is also possible to be configured to bend to 90 degrees or less or 90 degrees or more by changing the number of protrusions provided in the deformed portion. It is.
(5) The duct is not limited to a cylindrical shape, and may be a rectangular tube shape such as a quadrangle or a pentagon.
(6) The ducts targeted by the present application are not limited to those provided in automobiles, but also those provided in other vehicles and buildings.
(7) In the embodiment, a configuration capable of self-holding in a bent state as a deformed portion is given as an example. However, the present invention is not limited to this, and the deformed portion is held in a bent state with a support fitting for attaching a duct to a vehicle. May be.
(8) The configuration of self-holding in a state where the deformed portion is bent is not limited to the example of the embodiment, and other configurations can be adopted.

１０ａ湾曲部分，１２直管部，１４変形部，１６偏心部，２０突状部，
２２頂部，２４第１壁部，２６第２壁部，２８谷部，３０湾曲変形基点，
Ｃ中心軸線，Ｓ１直線距離，Ｓ２直線距離 10a curved part, 12 straight pipe part, 14 deformed part, 16 eccentric part, 20 projecting part,
22 top part, 24 1st wall part, 26 2nd wall part, 28 valley part, 30 curve deformation base point,
C Center axis, S1 linear distance, S2 linear distance

Claims

In a duct having a straight pipe portion and a bellows-like deformable portion that can be bent and deformed, and the bent portion is bent and attached to a vehicle,
An eccentric part is provided between the straight pipe part and the deformation part,
The eccentric portion has a ventilation cross section of a connecting portion with the eccentric portion in the deformable portion, and a side on the inner side of the bent portion of the deformable portion with respect to the vent cross section of the connecting portion with the eccentric portion in the straight pipe portion. Connect and move
A duct characterized in that a curved portion is constituted by the bent deformed portion and the eccentric portion.

2. The duct according to claim 1, wherein the eccentric portion is curved so that a side that is an inner side of the bending of the deforming portion becomes concave as it goes from the connecting end with the straight pipe portion toward the connecting end with the deforming portion. .

The duct according to claim 1 or 2, wherein the eccentric portion is provided on each side of the deformable portion.

The duct according to claim 3, wherein central axes of a pair of straight pipe portions provided with the deformation portion interposed therebetween are positioned on the same straight line in a straight state of the deformation portion.

The said deformation | transformation part is a duct as described in any one of Claims 1-4 comprised so that self-holding is possible in the bent state.