SU1384804A1 - Exhaust muffler of internal combustion engine - Google Patents

Abstract

The invention relates to engine-building and makes it possible to increase the effectiveness of sound attenuation. The slotted inlet pipe 2 is installed tangentially, and the exhaust pipe 3 is made integral with the through pipe 10 installed coaxially to the housing I. The transverse bulkheads 6 are provided with overflow windows located 8 ° XHO (9ut.razhennye equal distance from the axis of the housing. and intermediate chambers 7 and 9 are made in the form of at least one row of traps 12. The partition separates chambers 7 and -8 and is made in the form of a pipe plug. The gap between the casing and the pipe is filled with sound-absorbing material that removes resonant effect from the pipe and the housing. The exhaust gases, the passage of the pipe, are divided into two vortex flows moving in different directions. Both flows, the passage system of traps made in the form of brackets mounted inside the pipe, lose part of the sound energy due to the formation of paired colliding jets in a self-similar mode. Upon exiting the trap system, the streams, having a phase shift due to different lengths of the path, are merged. 4 hp f-ly, 3 ill. with SS (L with 00 4 C 13

Description

The invention relates to mechanical engineering, in particular to engine building, namely to the mufflers of the noise of an internal combustion engine.

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

Fig. I shows a muffler, a longitudinal section; figure 2 - section aa in figure 1; on fig.Z - trap, axonometrics.

The silencer contains a cylindrical body 1 with an inlet 2 and an exhaust 3 with nozzles and end walls 4 and 5, transverse partitions 6 dividing the body 1 into the first 7 and second 8 end and intermediate 9 chambers, and a through perforated pipe 10 connecting it to each other. chamber 7-9, and the inlet pipe 2 is installed on the side surface of the housing in the area of the intermediate chamber 9, partially placed. into the housing 1 and connected to the through pipe 10, and the outlet pipe 3 is made face in the area of the second end chamber 8. The inlet pipe 2 is slotted and installed tangentially, the exhaust pipe 3 is aligned together with the through pipe 10 installed coaxially to the body 1, transverse The partitions 6 are provided with perforated windows I1, and the perforations of the through pipe 10 in the zones of the first end 7 and the intermediate 9 chambers are made in the form of at least one row of traps 12.

The gap between the housing and the through pipe 10 can be filled with sound-absorbing material 13, the traps 12 on the through pipe 10 can be made in the form of brackets stamped inside, the partition 6 separating the intermediate 5 and 9 and the second front camera 8 can be made in the form of a through pipe plug 10, and the flow-through windows 11 of the partitions 6 can be located at an equal distance from the axis of the housing 1. As the sound-absorbing material 13, for example, kaolin wool can be used.

The noise pickup of an internal combustion engine operates as follows.

The exhaust gases of the internal combustion engine through the slotted tangential inlet of the inlet pipe 2 enter the perforated through

pipe 10, where it is divided into two vortex flows moving in different directions. Both streams, the passage system of traps 12, lose part of the sound energy due to the formation of twin colliding jets in the self-similar mode. One of the streams has a longer path due to the

passing through the first end chamber 7, the flow-through windows 11 of the partition 6 and most of the intermediate chamber 9. The second gas stream as it leaves the trap system 12

merges with the first with a phase shift due to the longer path of the latter.

Sound-absorbing material 13 removes the resonant effect from the through

pipes 10 and body 1 contribute to additional noise absorption.

The superimposed gases treated in this way through the overflow windows 11 in the partition 6 fall into the second

end chamber 8, where, due to the expansion of gases, additional dissipation of sound energy occurs and then gases are removed through perforations in the through pipe 10

muffler limits.

Claims (5)

Claim 1. Silencer of an internal combustion engine, comprising a cylindrical body with inlet and outlet pipes and end walls, transverse bulkheads dividing the body into first and second end and intermediate chambers, and through a perforated pipe that connects the interconnected chambers, the inlet pipe being installed on the side surface of the housing in the zone of the intermediate chamber, partially placed in the housing and connected to the through pipe, and the outlet is provided with a frontal in the area of the second end chamber, characterized in that, in order to increase the efficiency of sound attenuation, the inlet pipe is slotted and installed tangentially, the outlet pipe is integral with the through pipe installed coaxially to the body, transverse partitions provided with overflow windows, and the perforation holes of the through pipe in the zones of the first end and intermediate chambers are made in the form of at least one row of traps. 2. The silencer according to claim 1, wherein the gap is due to the fact that the gap between the casing and the through pipe is filled with sound-absorbing material. 3. The silencer of Clauses I and 2, T is characterized by the fact that the traps on the through pipe are made in the form of brackets stamped inside. 4. A silencer according to claims 1-3, characterized in that the overflow windows of the partitions are located at an equal distance from the axis of the housing. 5. The silencer according to item I-4, which is based on the fact that the partition separating the intermediate and second end chambers is made in the form of a plug through the pipe.