SU779603A1 - I.c. engine exhaust noise silencer - Google Patents

Description

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The invention relates to mechanical engineering, in particular to a device for suppressing exhaust noise of an internal combustion engine.

Mum silencers are known in which the exhaust gases are fed tangentially into a housing made of sound-absorbing material. The swirling gas flow is removed from the silencer chamber, separated by a nipple installed at the outlet of the body fl.

Muting noise in them is not effective enough, since the location of the sound-absorbing material beyond the limits of the killer listener is ineffective for jamming low and medium frequency sound waves.

Also known are silencers for exhaust noise of an internal combustion engine, containing a housing with inlet and outlet pipes, equipped with inlet and outlet chambers interconnected by means of a spiral channel, and a hollow fairing-25, installed coaxially with the inlet pipe and facing him with a blind end 2).

This embodiment of the silencer NODOSTost accurately allows the use of 30

the possibility of a known construction for damping noise, since sound waves are reflected in the inlet nozzle from the fairing to the noise source. The purpose of the invention is to increase the efficiency of sound attenuation.

The goal is achieved by the fact that the end edges of the outlet nozzle and the spinner form a screw gap connected to the outlet. the chamber and increasing in the direction of the gas flow, and the internal cavity of the airfoil is sealed with sound-absorbing material.

The invention allows to increase the degree of damping by a wide range of frequencies due to the fact that during the pro: {gas flow through the screw gap, the pressure pulsations and sound waves are smoothed, reflected from the fairing, and partially absorbed by the sound absorbing material.

Fig, 1 shows a schematic muffler, a general view; in fig. 2 same plan view; in fig. 3 is a section A-A in FIG. 2; in fig. 4 - section BB in FIG. 2; FIG. 5 is a perspective view of the muffler.

The silencer consists of an inlet chamber 1, made in the form of an centrifugal radial-axial cochlea, and an outlet chamber. 2, formed by the body of the Listener 3 and the face screw surface of the inlet chamber 1, rigidly connected to the body, interconnected by the bypass channel 4; equipped with a smooth entrance

- у-1 -астк6м ё (see figure 4). Prie 6m inlet chamber 1 is equipped with a 67 round Löm roundSpeedGate in the form of a perforated cone formed by the Cree; Linear rotating body and filled with sound absorbing material 7

The inlet 8 is made of an exponential horn, the e1 of a truncated located relative to the fairing b and forming with the latter an annular exponential did-diffuser 9 (see FIG. 3). ; . Outer wall of the inlet chamber 1

provided with perforations, for example, in

transverse slots, with a cavity located between the silencer housing, the inlet chamber and the helical wall

 the outlet chamber forms catching 11 for sparks and products of incomplete combustion of fuel .;

 Works proposed muffler as follows.

The exhaust gases enter through the inlet pipe 8 and the annular exponent diffuser 9 into the inlet chamber 1. When it enters the inlet chamber 1, the flow changes the direction of movement by 90 ° C, is twisted,

its speed decreases due to expansion of the NIACH -, - --- ..

From the inlet chamber 1 nOTOfk 1, the overflow channel 4, equipped with a smooth inlet section 5, enters the outlet 2, where the flow velocity is also reduced due to the diversion and is discharged through the outlet 10 to the environment. In this case, the flux changes 1CSH | 51YLENI from the rotary in the cavity of the outlet chamber 2 to the axial in the outlet 10. Sound-absorbing material 7 saves the attenuation SBykoibix

779603

waves reflected from the open center of the exhaust pipe 10.

The propagation of sound waves in the curvilinear channels of the inlet 1 and outlet 2 chambers and the overflow channel 4 due to the asymmetry of sound vibrations is accompanied by attenuation, in addition, the inlet 1 and outlet 2 kc measures are used as expansion chambers. .

Exhaust flow, passage

through the inlet 1 and outlet 2 chambers connected by the bypass channel 4f receives a rotational movement under the action of centrifugal forces. Available in particles incomplete

CGRBANE fuels and sparks are related to external steaks, provided with perforations in the form of transverse slots, and through the slots leading to the trap 11,; -. .

The use of the proposed silencer allows to increase the efficiency of noise suppression by reducing low and medium noise and reduces the likelihood of fires due to the presence of spark-ignition elements in the silencer.

Claims (2)

Invention Formula Engine Exhaust Muffler internal combustion, comprising a housing with inlet and outlet connections, equipped with inlet and outlet chambers interconnected by a spiral channel, and hollow the fairing installed with the inlet pipe and the deaf end face applied to it, so that, in order to increase the efficiency of noise suppression, the end edges of the outlet pipe and. the fairing form a screw gap, connected to the outlet chamber and increase the speed of the gas, fei inner fairing fairing .. -. ; 47i; f; at e te. .----. , - is full of sound-absorbing material, sources of information, accepted expertise 1, Patent School № 3130812, cl. 181-52, Publication, 1963, 2. US Patent 2911055, cl. 181-67, op. 1917, h eleven   m I AND gd / tfus.J