JPH07119456A - Turbine type muffler for internal combustion engine - Google Patents

Abstract

PURPOSE:To produce an effective silencing effect by a method wherein, by effectively using a part of movement energy of exhaust gas lost as exhaust resistance in a muffler, discharge of exhaust gas from the muffler in atmosphere air is promoted. CONSTITUTION:A turbine chamber 2 with which a turbine 3 is internally wrapped is coupled to the first stage of an expansion chamber 5 and a compressor chamber 6 with which a compressor 7 driven by the rotation force of the turbine 3 is internally wrapped is coupled to the second stage of the expansion chamber 5 and an exhaust port 8 is coupled to the compressor chamber 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer for suppressing exhaust noise in an exhaust system of an internal combustion engine.

[0002]

2. Description of the Related Art A silencer for an internal combustion engine is an absorption type in which sound waves are frictionally attenuated by a sound absorbing material. A resistance type that throttles the exhaust passage to suppress pressure fluctuations and attenuate them. Expansion type that attenuates by interference of reflected sound waves from the partition plate of the expansion chamber. Resonance type that attenuates by the resonance of sound waves. However, the actual muffler uses a combination of these methods.

[0003]

However, in the muffler of the above method, in order to obtain a sufficient muffling effect, the exhaust resistance of the entire internal combustion engine inevitably increases, resulting in an output of the internal combustion engine. This caused a decrease or an increase in fuel consumption. The present invention aims to solve the above problems.

[0004]

In order to achieve the above object, a turbine type silencer for an internal combustion engine according to the present invention is provided with a kinetic energy of exhaust gas discharged from a combustion chamber before a expansion chamber (5). The expansion chamber (5) is connected to the turbine (3) receiving the rotational force and the turbine chamber (2) and driven by the rotational force of the compressor chamber (6) and the turbine (3) after the expansion chamber (5). ) Is a silencer characterized by being connected with a compressor (7) that forcibly discharges exhaust gas into the atmosphere.

[0005]

A part of the kinetic energy as the gas flow of the exhaust gas discharged from the combustion chamber of the internal combustion engine and reaching the exhaust pipe side inlet (1) of the present invention through the exhaust pipe is part of the present silencer. It replaces the kinetic energy as the rotation of the turbine (3) in the turbine chamber (2) provided at the front.

Exhaust gas that has passed through the turbine chamber (2) reaches the expansion chamber (5) to reduce its volume by being radiated, and at the same time, is decelerated and decompressed to be further silenced.

The exhaust gas, which has been sufficiently silenced through the expansion chamber (5), reaches the compressor chamber (6) and is forcedly discharged by the compressor (7) driven by the rotational force of the turbine (3) to expand the expansion chamber ( 5) Semi-forced discharge port (8)
Will be released into the atmosphere.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of the muffler of the present invention. The exhaust gas, which is burned in the combustion chamber of the internal combustion engine, passes through the exhaust manifold and the exhaust pipe, and reaches the silencer exhaust pipe side inlet (1) of the present invention, containing a large amount of pulsating components at high temperature, the turbine chamber (2) The turbine (2) is guided to the inside and hits the blade of the turbine (2) provided therein, and the turbine (2) is rotated by the kinetic energy as the gas flow, and the drive shaft (4) is rotated.

A part of the pulsating flow component of the exhaust gas also has kinetic energy as a gas flow and is converted into rotational energy of the turbine (3).
However, the rotational speed of the turbine (3) is smoothed by the moment of inertia about the rotational movement of the turbine (3), the drive shaft (4) and the compressor (7), so that the turbine (3) passes through the turbine chamber (2) and expands. The pulsating flow component of the exhaust gas guided to the chamber (5) is rectified. That is, the expansion chamber (5)
In the exhaust gas guided to (1), the pulsating flow component is reduced and the flow velocity is smoothed, and at the same time, a part of the sound wave is reduced. Moreover, this action can be adjusted by arbitrarily adjusting the moment of inertia of the rotating system of the turbine (3), the drive shaft (4) and the compressor (7). It can be said that this action is as if the pulsating current was rectified by the rectifier.

At that time, the sound wave component contained in the exhaust gas as an explosive sound is absorbed by resonance of the blade of the turbine (3), interferes with a reflected wave from the blade surface of the turbine (3), and When combined, they are subject to rectification, that is, muffling.

That is, the muffler turbine chamber (2) of the present invention
In the turbine (2), it functions as a resistance type, an absorption type, and a resonance type of the conventional silencer.

Exhaust gas that has passed through the turbine chamber (2) reaches the expansion chamber (5) to be radiated, and its volume is reduced.

Further, the sound absorbing effect is exerted by the interference of the reflected sound waves from the wall plate in the expansion chamber. That is, the expansion chamber (5) functions as an expansion type of the conventional silencer.

Further, instead of the expansion chamber (5) of the silencer of the present invention, the silencer of the present invention is combined with a resistance type, expansion type, absorption type or resonance type silencer conventionally used in this portion. It is also possible to further enhance the sound deadening effect of the vessel.

The exhaust gas that has passed through the turbine chamber (2), the turbine (2) and the expansion chamber (5) of the silencer of the present invention is sufficiently rectified and subjected to the silencing action. ) Exhaust gas, the turbine (2)
Due to the forced exhaust action of the compressor (7) driven by the drive shaft (4) that receives the rotational force due to the rotation of, the air is semi-compulsively discharged into the atmosphere through the exhaust port (8).

[0016] This action is because in the turbine (3) in the turbine chamber (2), a part of the kinetic energy of the exhaust gas discharged from the combustion chamber that has been deprived for rectification and muffling and passed through the exhaust pipe is finally It means that the flow rate of the exhaust gas discharged from the exhaust port (8) has been replaced.

Further, in the compressor chamber (6) and the compressor (7) as in the turbine chamber (2) and the turbine (3), the turbine (3),
The rotational moment of inertia of the drive shaft (4) and the compressor (7) smoothes the rotational speed of the compressor (7), so that the residual pulsating flow component of the exhaust gas introduced from the expansion chamber (5) is rectified. Therefore, the sound deadening effect is further added. .

Similarly, at that time, the sound wave component remaining in the exhaust gas introduced from the expansion chamber (5) is absorbed by the resonance of the blades of the compressor (7) and is absorbed from the surface of the blades of the compressor (7). Interference with reflected waves and synthesis,
The rectification, that is, the silencing effect is further received.

By changing the number of blades of the compressor (7) and the interval between them, the characteristics of the sound wave frequency when the exhaust gas passes through the compressor chamber (6) and the compressor (7) can be changed. By adjusting, it becomes possible to more effectively muffle sound waves of a specific frequency.

In this embodiment, the drive force is mechanically transmitted from the turbine (3) to the compressor (7) by connecting the turbine (3) and the compressor (7) with the drive shaft (4). Depending on the gears, power transmission by meshing gears, or power transmission using a hydraulic pump or electric power can be used.

The turbine chamber (2) of the muffler of the present invention,
There is also a method of forming a silencer only with the turbine (3) and the expansion chamber (5) and utilizing the characteristic effect of that portion,
In that case, the turbine (3) needs to have a moment of inertia and resistance for proper rotation.

[0022]

As described above, in the silencer of the present invention, a part of the kinetic energy of the exhaust gas, which is lost as exhaust resistance in the conventional silencer, is effectively used, and the exhaust gas from the silencer to the atmosphere is exhausted. Therefore, the effective muffling effect can be obtained while the exhaust resistance of the muffler is reduced and the exhaust resistance of the muffler is reduced. That is, since the exhaust silencer of the present invention can reduce the exhaust resistance of the internal combustion engine as a whole, it has the effect of increasing the fuel efficiency and improving the output of the internal combustion engine.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a muffler of the present invention.

[Explanation of symbols]

 1 Exhaust pipe side inlet 2 Turbine chamber 3 Turbine 4 Drive shaft 5 Expansion chamber 6 Compressor chamber 7 Compressor 8 Exhaust port

Claims (1)

[Claims] 1. A turbine chamber (2) which receives a rotational force due to the kinetic energy of exhaust gas discharged from a combustion chamber and a turbine chamber (2) including the turbine (3) in front of the turbine chamber (2). ) Is connected to the turbine chamber (2), the compressor chamber (6) is connected to the turbine chamber (2) after the expansion chamber (5), and the turbine (3) is connected to the compressor chamber (6). A compressor (7) driven by the rotating force of the compressor (7) is provided, and the exhaust gas is forcibly discharged from the expansion chamber (5) to the atmosphere through the discharge port (8) by the forced discharge force of the compressor (7). vessel.