SU1423756A2 - Exhaust muffler of internal combustion engine - Google Patents

Abstract

The invention makes it possible to increase the efficiency of sound attenuation. Case 1 is divided by partitions 4, 5 into resonant, expansion and exhaust chambers (K) 6-8, respectively. Chambers 7, 8 are interconnected by means of by-pass nozzles. The outlet 13 is installed on the side surface of the housing in the middle part K 8. Perforated intake. the pipe 9 is installed coaxially with the body and partially placed in the latter with the open end 14 in K 7. The perforation of the pipe 9 is made in zones K 6-8. At the open end 14 of the pipe 9, an annular screen 20 is installed, made with an area of 1.0-1.3 of the total area of the flow area of the perforation holes of the pipe 9 in zone K 7 and 8. The holes of the perforation 19 in zone K 8 are made with a diameter equal to 0.1-0.12 of the inner diameter of the pipe 9, and a total area of 0.20-0.25 of the cross-sectional area of the pipe 9. The effectiveness of sound attenuation in a wide frequency range is provided by a combination of K 6-8, different frequencies, two times changing the direction of movement of the gas stream, its separation ultiple parts and selected ratio of length to 6-8 and bypass pipes. Increasing the efficiency of noise jamming in the most adverse for the frequency range is provided by passing some of the gases through the perforation holes 19 and by the overpressure created by the screen 20. 2 ill. § (L 4 to compile O) N puft

Description

one

The invention relates to machine building, in particular engine building, namely, to silencers of engine exhaust noise of the first combustion engine.

The aim of the invention is to increase the efficiency of sound attenuation,

FIG. 1 has a silencer, airfoil; in fig. 2 is a section A-L in FIG. one.

The silencer contained: t case I, fitted with end caps 2, J and divided with transverse partitions 4, 5 into resonances along b, expansion 7 and exhaust chamber 1 through 8, perforated inlet pipe 9, exhaust outlet 10-12 IT outlet 13, installed on the side surface of the casing in the zone of the middle part of the action camera 8, Expansion 7 and exhaust 8 Ka. Stringers are interconnected by means of by-pass nozzles 10-12. The inlet pipe 9 is installed coaxially with the coil / and partially placed in the nose with the placement of the open end 14 in the expansion chamber “7, and the perforation of the inlet pipe 9 is made in g; the non-resonant chamber 6 is section 15, and in the expansion zone privateers 7 chastok 16. The length of the section 16in1: usku Yu 1 pipe 9, placed in the distributor7:;: OS; chamber 7, is equal to half the angle L of the outlet chamber 8 and does not exceed. distance 1 from the open end 14 of the inlet pipe 9 to the mixed butt end; gear 3, which is more or equal to L / 2. The ends of the bypass nozzles 10-12 are placed on the cross-sectional plane;: the axle 13 and the open end 14 of the inlet pipe 9 are held through the axis of the outlet plate, and the axis of the outlet pipe 13 is placed in a longitudinal plane offset from the adjacent by-pass nozzles 11, 12 by equal angles d, In case 1, in one plane with the open end 14 of the inlet pipe 9, there is a bracket 17 that connects pipe 9 with the ends of the bypass pipes 1 (Y 2 and equipped with} 1 direction D1r-D flow areas 18, space-v ; the zone of bypass nozzles 10-12.

The inlet pipe 9 is provided with an additional perforation 19, 3F; Silnen in the area of the outlet B, and an annular screen 20 mounted on the open end 14 of the pipe 9 n expanded-. teln chamber 7. Diameter d hole 14

ten

1i

20

25

25

37562

Additional perforations 19 are 0.10-0.12 of the inner diameter D of the inlet pipe 9. Cym apí the hole area; the additional perforation is 0.20-0.2 of the bore section of the inlet pipe 9. The area of the 20 is equal to 1.0-1.3 total ggcho1 a.tsn bore section of the perforation holes of the inlet pipe 9 in the area of the expansion 7 and v111G1usnoy chambers. The openings of the additional perforation 19 are shifted to the resonant chamber 6 relative to the outlet nozzle 13.) The noise damper works on the track .jy; M О1PHASE 1.

The flow of hot air from the internal combustion engine enters 1 (on the sundown pipe 9 into the housing 1 of the sound. Resonant chamber 6 provides 1ltr, 1: 4 and muffling high often: gas flow noise. Next, the main pipe 9 enters In a 1L1Telnu1 camera, where, expanding, they lose speed and sound energy, they change the direction: 1and movement and through 10–12 G of access from outlet 7,.:. - jiyGoK 13 POR. -shaled to the atmosphere.

The effect of noise - noise at a wide frequency range is provided by a combination of KaMeyj 6-8, performing crustal fuscities, a twofold change in the flare of the gas flow, pasAeJieHHeb. on a few 4acieii in re-nozzles 10-12 and picked up; .)} the ratio of the lengths of the chambers 6-8 and nozzles 10-12. A reduction in the sore of the passage of gases is ensured by:; Shem of the N-pipe U and chambers 6-8, with perforations at 16 BnycKHOii i ruby; 9, open end 14, selection of the distance from the end of 14 gpusk 9 to the torn valve ;; ki 3 of the housing 1, the arrangement of the ends of the riepenycKiibfx nozzles 1012 in the same planes with 14 14

BnycKHOii pipe 9 and the axis of the outlet nozzle 13, the displacement of the axis of the exhaust nozzle 13 in the transverse plane relative to the axes of the bypass nozzles 11, 12 at an angle and flow around the direction of the hull-m-p 18 bracket 17.

Improving the efficiency of jamming noise in the most perceptually unfavorable frequency range is provided by passing some of the gases through the opening of the acoustic punch.

ten

45

50

radio 19 and support created by the screen 20.

Claims (1)

Invention Formula Exhaust muffler of the internal combustion engine according to aut. St. No. 1344920, characterized in that, in order to increase the efficiency of sound attenuation, the perforated intake pipe is provided with an additional perforation, implanted in the area of the exhaust chamber, and an annular screen pom installed at its open end in the expansion chamber, with additional perforation openings having a diameter of 0.10-0.12 of the internal diameter of the inlet pipe and a total area of 0.20-0.25 of the area of the inlet section of the inlet pipe, and the screen is made of an area equal to 1.0-1.3 of the total area of the bore of the perforation holes of the inlet pipe in the zone of the expansion and exhaust chambers. OS W sc 18