JPH0477093U

JPH0477093U -

Info

Publication number: JPH0477093U
Application number: JP12049990U
Authority: JP
Priority date: 1990-11-16
Filing date: 1990-11-16
Publication date: 1992-07-06

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１，２図はジエツト推進式舟艇用搭載エンジ
ンの排気マフラーに適用具体化した本考案の基本
実施例を示す側面図と正面図、第３，４図は第１
図の３−３線と４−４線に沿う各断面図、第５図
は第２図の５−５線断面図、第６図はその舟体に
対する排気マフラーの取付け使用状態を示す全体
概略側面図、第７図は本考案の第１変形実施例を
示す側断面図、第８図は第７図の８−８線断面図
、第９図は同じく第２変形実施例を示す側断面図
、第１０図は第９図の１０−１０線断面図、第１
１図は更に第３変形実施例を示す側断面図である
。２８，２８ａ……直管、２８ｂ……曲管、３１
，３１ａ……リード凹条、３１ｂ……リード凸条
、Ｏ−Ｏ……開口中心線、α……捻り角度。 Figures 1 and 2 are side and front views showing a basic embodiment of the present invention applied to an exhaust muffler for a jet-propelled watercraft engine, and Figures 3 and 4 are
Each sectional view taken along lines 3-3 and 4-4 in the figure, Figure 5 is a sectional view taken along line 5-5 in Figure 2, and Figure 6 is an overall schematic showing how the exhaust muffler is installed and used on the hull. 7 is a side sectional view showing a first modified embodiment of the present invention, FIG. 8 is a sectional view taken along line 8-8 in FIG. 7, and FIG. 9 is a side sectional view showing a second modified embodiment. Figure 10 is a sectional view taken along the line 10-10 in Figure 9.
FIG. 1 is a side sectional view further showing a third modified embodiment. 28, 28a...straight pipe, 28b...bent pipe, 31
, 31a... Lead concave line, 31b... Lead convex line, O-O... Opening center line, α... Twist angle.

Claims

【実用新案登録請求の範囲】１直管２８，２８ａ又は曲管２８ｂの内周面に
複数の渦流生成用リード凹条３１，３１ａを、そ
の長手中心線が直管２８，２８ａ又は曲管２８ｂ
の開口中心線Ｏ−Ｏと一定の捻り角度αだけ交叉
する傾斜状態として、ほぼ平行に列設して成る流
体の通路構造。２直管２８，２８ａ又は曲管２８ｂの内周面に
複数の渦流生成用リード凸条３１ｂを、その長手
中心線が直管２８，２８ａ又は曲管２８ｂの開口
中心線Ｏ−Ｏと一定の捻り角度αだけ交叉する傾
斜状態として、ほぼ平行に列設して成る流体の通
路構造。[Claims for Utility Model Registration] 1. A plurality of vortex-generating reed grooves 31, 31a are provided on the inner peripheral surface of the straight pipe 28, 28a or the curved pipe 28b, and the longitudinal center line thereof is the straight pipe 28, 28a or the curved pipe 28b.
A fluid passage structure arranged in substantially parallel rows in an inclined state that intersects the opening center line OO by a certain twist angle α. 2. A plurality of vortex-generating reed protrusions 31b are provided on the inner peripheral surface of the straight pipe 28, 28a or the curved pipe 28b, so that the longitudinal center line thereof is constant with the opening center line O-O of the straight pipe 28, 28a or the curved pipe 28b. A fluid passage structure in which the fluid passages are arranged in substantially parallel rows in an inclined state that intersects by a twist angle α.