Exhaust silencer for a railway locomotive
AssigneeCentro Richerche Fiat S.p.A.
InventorsLuigi Franco, Giorgio Bertotti
Life of this patent
Estimating the term…
Abstract
An exhaust silencer for a railway locomotive with a supercharged, six-cylinder diesel engine developing a power of about 200-250 HP has a cylindrical body closed at each end by an end wall and subdivided into three resonance chambers and three gas expansion chambers by five dished baffle-plates, the fourth and fifth baffle-plates each having four tube sections. To optimize the acoustic performance specific dimensions of the chambers, of the tube sections, of a perforated induction pipe and of an outlet pipe are prescribed.
Claims7
Exhaust silencer for a railway locomotive having a supercharged diesel engine with six cylinders and a power rating of about 200-250 HP comprising:
- a hollow cylindrical body;
- respective end-walls closing the opposite ends of said body;
- an induction pipe, a portion of which traverses one said end-wall, and
- an exhaust gas outlet pipe traversing the other said end-wall,
- wherein the improvement consists in said silencer body having an internal diameter of 340 millimeters, a length of 2200 millimeters and comprising:
- a first dished baffle-plate located 710 millimeters from said one end-wall;
- a first resonance chamber defined by said one end-wall and said first baffle-plate;
- a second dished baffle-plate located 200 millimeters from said first baffle-plate;
- a second resonance chamber defined by said first and second baffle-plates;
- a third dished baffle-plate located 110 millimeters from said second baffle-plate;
- a third resonance chamber defined by said second and third baffle-plates;
- a fourth dished baffle-plate located 330 millimeters from said third baffle-plate;
- a first gas expansion chamber defined by said third and fourth baffle-plates;
- a fifth dished baffle-plate located 320 millimeters from said fourth baffle-plate and 530 millimeters from said other end-wall;
- a second gas expansion chamber defined by said fourth and fifth baffle-plates;
- a third gas expansion chamber defined by said fifth baffle-plate and said other end-wall;
- four tubular ducts supported by said fourth baffle-plate and having respective internal diameters of 60 millimeters and respective centres equally spaced about a circumference, concentric with the longitudinal axis of said body, with a diameter of 180 millimeters, each of said ducts extending for a length of 46 millimeters into said first expansion chamber and for a length of 54 millimeters into said second expansion chamber;
- four tubular ducts supported by said fifth baffle-plate and having respective internal diameters of 60 millimeters and respective centres located upon a circumference, concentric with said longitudinal axis of said body, with a diameter of 180 millimeters and angularly displaced by 45.degree. with respect to said ducts on said fourth baffle-plate, said four tubular ducts on said fifth baffle-plate extending into said second gas expansion chamber for a length of 69 millimeters and into said third gas expansion chamber for a length of 92 millimeters, and wherein:
- said resonance and gas expansion chambers are arranged in series longitudinally of the body;
- said portion of said induction pipe has an internal diameter of 140 millimeters and extends through said resonance chambers to said first gas expansion chamber, projecting into the latter for a length of 34 millimeters;
- said portion of said induction pipe has respective aperture means communicating with the respective said resonance chambers, and
- said exhaust gas outlet pipe has an internal diameter of 140 millimeters and a portion which extends into said third gas expansion chamber for a length of 138 millimeters.
Dependencies are inferred from the claim text.