Патент USA US2132425код для вставки
oct. 11, 193s. G. P. LIST 2,132,425 MUFFLER Filed June 22, 1936 _ l NVENTOR BY GEORGE P. L/sT í ATTORNEY 2,132,425 Patented Oct. 11, 1938 UNITED STATES PATENT OFFICE 2,132,425 MUFFLER George P. List, South Seattle, Wash. Application June 22, 1936, Serial No. 86,1487 (Cl. 181-46) (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. _757) duit I5 and expanded conduit .I6 close to the This invention relates to a mufiler, and has for Il. an object to provide an improved light weight conduit The mufller I0, including the foregoing de and inexpensive mui‘ller of very simple construc scribed pipes and conduits, is preferably formed tion and high etiiciency, for use in connection by pressing the same out of metal in two comple- 5 5 with internal combustion engines, particularly on _ mentary sections 2| and 22. Flanges 23 and 24 vtehicles such as boats, aircraft, land vehicles, extending around the ends of sections 2| and_22 e c. A further object of this invention is to provide and Webs 25 and 26, extending between the a muflller occupyinga minimum of space and pressed out portions which form the conduits and pipe sections, provide a suitable means for 10 lo providing a maximum of eiliciency. securing the sections 2| and 22 together in any A still further object of this invention is to suitable manner, preferably by welding, it being provide a muiller which is made of two parts understood, however, that any suitable clamping suitably fastened together, the two parts being means may be substituted instead for securing substantially identical, and being made of suit the webs and flanges together and holding the 15 15 able metal such as brass, steel, aluminum, or muiller in assembled position. other fabricated metal. This muffler IIJ depends for its effectiveness l As a further object of this invention, the muiller of this invention conducts the exhaust gases in upon the fact that a straight line is the shortest a direction continuously away from the entrance, distance between two points. The exhaust gases entering through pipe II are divided as a result 20 20 and at the same time spreads out the exhaust of the taper I5 so that part of them follow the impulses to such an extent that they flow stead ily out of the mufller well below the velocity of semi-circular passages Il and I8, I9 and 20, sound and with a complete absence of drumming. while a portion goes through the smaller conduit With the foregoing and other objects in view, Il. That portion going through the smaller con duit I4 arrives at the expanding conduit I6 before u as will hereinafter become- apparent, this in the portions of the exhaust gasses flowing vention comprises- the constructions, combina through ‘the concentric conduits. Further, due to tions and arrangements of parts hereinafter the Venturi effect of the tapered conduit I5 and claimed, disclosed and illustrated, wherein, Fig. 1 is an inside plan view of one of the the curvature of the concentric conduits, the exhaust gases will be traveling at different speeds 30 30 muiller sections of this invention; as they reunite at the expanded conduit I6 to Fig. 2 is a complete sectional view on line enter the muffler outlet pipe I3. 2-2 of Fig. 1; and will be obvious, the exhaust impulses will Fig. 3 is a complete sectional view on line beAs thus spread out, for in reunitlng the portion 3--3 of Fig. 1. A of the gas traveling through the conduit Il will 35 There is shown at III the muiller of this in arrive at the expanded pipe I6 more quickly than vention, which includes an exhaust pipe II lead that portion going through the concentric pipes ing to the muffler body I2 andnt'hrough the body I2 to the exhaust outlet pipe I3. As will be ap parent from the drawing, the inlet and outlet pipes are substantially identical and hence inter changeable, so that the muiller may be connected up at either end. Extending through the muiiler body I2 from the pipe II and pipe I3 is a conduit I4, which is of a lesser diameter than the diameters of the pipes II and I3. Leading to the conduit I4 from the pipe II is a tapering conduit I5, and leading from the pipe I4 and pipe I3 is an expanding conduit I6. Semi-circular conduits I1 and I8, of 50 a diameter substantially equal to that of the con duit I4, connect the entrance of the tapered con duit I5 to the exit of the expanded conduit I6. Concentric with the semi-circular conduits I1 and I8 is another pair of semi-circular conduits ï I9 and 20, which connect with the tapered con I9 and 20, and, similarly, these reunited portions will arrive more quickly at the end of the ex panded pipe I6 than those portions traveling ¿o through the outer concentric pipes I1 and I8. The exhaust impulses will thus be spread out and broken up to such an extent that they will flow smoothly and steadily out of the muffler Ill at I3 below the velocity of sound and with a ¿5 complete absence of drumming, thus providing an eiiicient, light-weight and'inexpensíve muf fler. . The invention described herein may be manu factured and used by or for the Government of w the United States of America for governmental purposes without the payment of any royalties thereon or therefor. I claim: 1. A muiller comprising an entrance pipe, an 2 2,132,425 exhaust pipe, and a plurality of conduits con necting said entrance pipe to said exhaust pipe, said conduits being of lesser diameter than said entrance pipe, some of said connecting conduits being longer than the others of said connecting conduits, and a short, substantially straight con duit leading from said inlet pipe at one side to said outlet pipe at the opposite'side, a tapering conduit connecting said inlet pipe to said straight 10 conduit and an expanding conduit connecting said straight pipe to said outlet pipe, said longer conduits being semi-circular and leading from said tapering conduit to said expanding conduit. 2. A muiller comprising an inlet pipe, a muilier 15 body and an outlet pipe at the opposite side of said muiller body from said inlet pipe, said muf fier body including a plurality ofconduits of a diameter smaller than the diameter of said inlet pipe, one of said conduits in said muiller body 20 extending in a substantially straight line from said inlet pipe to said outlet pipe, a tapering conduit connecting said inlet pipe to said straight conduit, and an expanding conduit connecting said straight conduit to said outlet pipe. 25 3. A muffler comprising an inlet pipe, a muñier body and an outlet pipe at the opposite side of said muiller body from said inlet pipe, said muf fler body including a plurality of conduits of a diameter smaller than the diameter of said inlet 30 pipe, oneof said conduits in said muiìler body extending ina substantially straight line from said inlet pipe to said outlet pipe, a tapering con duit connecting said inlet pipe to said straight conduit, an expanding conduit connecting said 35 straight conduit to said outlet pipe, and a plural ity of concentric conduits connecting said taper ing conduit to said expanding conduit. 4. A muñler comprising an inlet pipe, a muiiier body and an ~outlet pipe at the opposite side of said muffler body from said inlet pipe, said muf ñer body including a plurality of conduits of a diameter smaller than the diameter of said inlet 5 pipe, one of said conduits in said muñier body extending in a substantially straight line from said inletY pipe to said outlet pipe, a tapering conduit connecting said inlet pipe to said straight conduit, an expanding conduit connecting said 10 straight conduit to said outlet pipe, and a plural ity of concentric conduits connecting said taper ing conduit to said expanding conduit, said con centric conduits being in the same plane, and said outlet pipe being of a diameter substantially equal to the diameter of said inlet pipe, whereby the exhaust impulses entering said muiller through said inlet body are spread out into said conduits and reunited in a steady flow into said outlet pipe. 20 5. A muiller body consisting of a number of complementary pressed metal sections, each pressed metal section comprising a plurality of semi-cylindrical conduits and a plurality of webs integrally connecting said semi-cylindrical con 25 duits into a single section. 6. In a muiller body, a pressed metal section comprising a plurality of semi-cylindrical con duits, a portion of each conduit being spaced apart from a portion of each other conduit and 30 a web integrally connecting each spaced apart portion of each conduit to that of the adjoining conduit. GEORGE P. LIST.