초록 ▼

To reduce turbulence in a fluid flow, especially exhaust gas from automotive internal combustion engines, within a flexible conduit element, a bellows (1, 40, 42) has an internal hose (6) located therein made of woven or knit metal wire. The hose is engaged against the internal corrugations of the b

To reduce turbulence in a fluid flow, especially exhaust gas from automotive internal combustion engines, within a flexible conduit element, a bellows (1, 40, 42) has an internal hose (6) located therein made of woven or knit metal wire. The hose is engaged against the internal corrugations of the bellows (1) and/or a connecting pipe (41) between adjacent bellows (40, 42) to guide the exhaust gases, and dampen vibrations and oscillations, which may become resonant with the corrugations of the bellows, and thereby decrease noise level during the gas flow. The hose (6) is engaged against the inner corrugations (3) of the bellows by, for example, first axially compressing the hose to result in permanent deformation of the wires to a diameter larger than the clear inner diameter of the bellows; by then forcing the hose into the bellows, the hose will resiliently compress and engage against the bellows. The hose, at least at one point remote from an attachment stub (4) has the wires thereof circumferentially connected so that, upon axial compression, the hose will bulge in barrel shape. More than one connection (17, 18, 20-22) of the wires may be used. The frictional engagement force may be enhanced and controlled by additional internal force spreading elements, such as springs and the like, or by formation of pimples or small bulges embossed on the outside of the hose.

대표청구항 ▼

[ We claim:] [1.] A fluid conduit element (1), optionally for conduction of exhaust gases from internal combustion engines, havinga conduit part including a metallic bellows, defining inner corrugated wall portions (3),said conduit part having coupling stubs (4, 5) attached to end portions of the co

[ We claim:] [1.] A fluid conduit element (1), optionally for conduction of exhaust gases from internal combustion engines, havinga conduit part including a metallic bellows, defining inner corrugated wall portions (3),said conduit part having coupling stubs (4, 5) attached to end portions of the conduit element;an inner woven or knit hose (6, 206, 306, 406, 506, 906) made essentially of metal wires,said inner hose (6, 206, 306, 406, 506, 906) being secured to one (4) of said coupling stubs (4, 5) to form a common end connection therewith,wherein the outer diameter of the inner hose (6, 206, 306, 406, 506, 906) essentially matches the clear inner diameter of the conduit part;wherein the wires of the hose are relatively fixed in position with respect to each other over the circumference of the hose at locations (17, 18, 20, 21, 22, 23) spaced from said one coupling stub (4); andinternal hose spreading force means are provided, acting on the hose (6, 206, 306, 406, 506, 906) tending to radially spread or expand at least a portion of said hose and frictionally engage at least said portion of the hose with at least one facing inner wall portion of the conduit part (1, 40, 41, 42).