RU2117777C1 - Internal combustion engine exhaust muffler - Google Patents

Abstract

FIELD: automotive industry; exhaust systems of internal combustion engines. SUBSTANCE: muffler has housing with front and rear end face walls, inlet branch pipe and outlet branch pipe formed by walls of inner hollow perforated cylinder and housing. Its outlet section is arranged at side of rear end face wall and perforations of inner hollow cylinder are made at side of front end face wall. Partitions forming slot channels can be installed between walls of inner hollow perforated cylinder and housing. Additional cylinder can be installed inside hollow perforated cylinder, additional cylinder being connected with inlet branch pipe. Additional cylinder accommodates tape helix with clearance between turns. Surface of helix and inner surface of housing can be provided with catalytic coating. Housing of muffler is cross section can be made elliptical. EFFECT: reduced noise level. 5 cl, 2 dwg

Description

 The invention relates to the field of automotive industry and can be used to dampen the noise produced by internal combustion engines.

 A known silencer for the exhaust of an internal combustion engine, comprising a housing with front and rear end walls, an inlet and outlet pipe and an internal hollow perforated cylinder, the inlet pipe and cylinder being mounted coaxially relative to each other and with an eccentricity relative to the housing, and the perforation holes are made in the zone opposite the outlet pipe (ed. St. N 1588881, CL F 01 N 1/10. 1988).

 Despite the fact that this design allows you to extend the range of exhaust gases, the sound attenuation efficiency remains relatively low.

 Also known is a silencer for exhausting an internal combustion engine, comprising a housing with front and rear end walls, an intake and exhaust pipe, and an internal hollow perforated cylinder mounted with a clearance relative to the housing. The outlet pipe is partially located in the housing and is made with holes in the area opposite the outlet pipe, and the space between the inlet pipe and the cylinder is divided by a zigzag partition with the formation of oppositely directed alternating channels along the entire outer surface of the inlet pipe connecting the holes of the inlet pipe and the hollow cylinder in pairs (RU application N 94-025348 / 06, F 01 N 1/10 dated 05/27/96).

 The specified silencer is quite effective, however, and it leaves the possibility of further improvement of the device.

 This invention solves the problem of reducing the noise generated by an internal combustion engine.

 The technical result is the creation of a silencer for the exhaust of an internal combustion engine with high noise suppression efficiency.

 The essence of the invention lies in the fact that the silencer for exhausting an internal combustion engine comprises a housing with front and rear end walls, an inlet and an outlet pipe, an internal hollow perforated cylinder mounted with a gap relative to the housing, while the exhaust pipe is formed by the walls of the internal hollow perforated cylinder and the housing and its output section is located on the side of the rear end wall, and the perforation of the inner hollow cylinder is made on the side of the front end wall.

 Between the walls of the hollow perforated cylinder and the housing can be installed partitions forming helical channels.

 An additional cylinder may be installed in the inner hollow perforated cylinder, connected to the inlet pipe and the internal cavity of the hollow perforated cylinder, and a tape spiral with a gap between the turns is located inside the cylinder.

 The surface of the tape spiral of the additional cylinder and the inner surface of the housing can be made with a catalytic coating.

 The silencer body in cross section can be made in the form of an ellipse.

 The invention is illustrated by drawings, where in FIG. 1 and 2 show a longitudinal section and a scan along the generatrix of the internal hollow perforated silencer cylinder.

 The noise suppressor comprises a housing 1 with front 2 and rear 3 end walls, an inlet 4 and an outlet pipe 5 and an internal hollow perforated cylinder 6 mounted with a gap relative to the housing 1, while the exhaust pipe 5 is formed by the walls of the hollow perforated cylinder 6 and the housing 1 and its the output section is located on the side of the rear end wall 3, and the perforation 7 of the hollow cylinder 6 is made on the side of the front end wall 2.

 Between the walls of the hollow perforated cylinder 6 and the housing 1, partitions 8 are formed, forming helical channels connecting the holes of the perforation 7 with the outlet pipe 5.

 The inner hollow perforated cylinder may comprise an additional cylinder (not shown in the drawing) connected to the inlet pipe 4 and the internal cavity of the hollow cylinder 6, and a tape spiral with a gap between the turns is located inside the additional cylinder.

 The muffler works as follows.

 Engine exhaust gas flows through the inlet pipe 4 into the cavity of the inner perforated cylinder 6, where it expands and from there through the perforation holes 7 enter the gap between the housing 1 and the inner hollow cylinder 6 and then pass along the generatrix of the cylinder to the exhaust pipe 5 and are released into the atmosphere. Passing through a narrow channel formed by the walls of the housing 1 and the hollow cylinder 6, the sound wave of the exhaust gases is suppressed due to multiple reflection from the walls of the channel.

 When installing the partition 8 in the slotted channel, helical channels are formed connecting the perforation 7 with the exhaust pipe 5, while increasing the path of exhaust gases in the muffler and increasing the efficiency of sound attenuation.

 The silencer housing 1 in cross section can be made in the form of an ellipse, which reduces the height of the silencer.

 The surface of the tape spiral of the additional cylinder and the inner surface of the housing 1 can be made with a catalytic coating, which ensures the purification of exhaust gases.

 The universal design of the silencer allows it to be used for any device operating on compressed gas or air and to reduce the noise level of the pneumatic exhaust to 65 - 70 dB. The silencer fits well into the design of the pneumatic tool and can be used in jack hammers, pneumatic wrenches, mobile and stationary compressor stations, pneumatic punch, press and other equipment using compressed air, as well as for damping the pneumatic exhaust of the discharge channels of any gas and pneumatic equipment.

Claims (5)

 1. The silencer of the exhaust output of the internal combustion engine, comprising a housing with front and rear end walls, an inlet and outlet pipe and an inner hollow perforated cylinder installed with a gap relative to the housing, characterized in that the exhaust pipe is formed by the walls of the inner hollow perforated cylinder and the housing and its the output section is located on the side of the rear end wall, and the perforation of the inner hollow cylinder is made on the side of the front end wall.  2. The muffler according to claim 1, characterized in that between the walls of the inner hollow perforated cylinder and the housing there are installed partitions forming slotted channels.  3. The muffler according to claim 1 or 2, characterized in that an additional cylinder is installed in the inner hollow perforated cylinder, connected to the inlet pipe and the internal cavity of the hollow cylinder, and a tape spiral with a gap between the turns is located inside the additional cylinder.  4. The muffler according to claim 3, characterized in that the surface of the tape spiral of the additional cylinder and the inner surface of the housing are made with a catalytic coating.  5. A silencer according to any one of claims 1 to 4, characterized in that the silencer body in cross section is made in the form of an ellipse.

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