CN105927315A - Impedance compound silencer - Google Patents

Abstract

A new type of impedance composite muffler, built-in resistive muffler uses resistive sound-absorbing material, which is attached to the rigid pipe wall where the sound wave propagates. It allows most of the high-frequency sound waves to enter the material, so that the sound waves are gradually consumed. It is better for high-frequency noise; the built-in resistance muffler is mainly to bypass the resonant cavity on the pipeline or to make the area of the pipeline change suddenly, and it is selective for sound waves of different frequencies, so that the sound waves are reflected in the pipeline and Interference and other phenomena, the noise reduction effect is better for low and medium frequency noise. The muffler can integrate various functions of a resistive muffler and a resistive muffler, and has a good control effect on exhaust noise in various frequency bands. At the same time, the utility model can better save the use space and is suitable for various vehicle applications, so it has good market value and application prospect.

Description

A compound impedance muffler

technical field

The invention belongs to the technical field of automobile manufacturing, in particular to an impedance composite muffler.

Background technique

The main noise sources of vehicles include intake noise, exhaust noise, fan noise, engine surface radiation noise and noise generated by vibration of other parts, among which exhaust noise is an important part that cannot be ignored. Existing exhaust mufflers with mature technology can be mainly divided into resistive mufflers and resistive mufflers. The resistive muffler uses a resistive sound-absorbing material, which is attached to the rigid pipe wall where the sound wave propagates. It allows most of the high-frequency sound waves to enter the material, so that the sound waves are gradually exhausted, and it has a better effect on high-frequency noise; The resistant muffler is mainly to bypass the resonant cavity on the pipeline or make the area of the pipeline change suddenly. It is selective for the sound waves of different frequencies, so that the sound waves will reflect and interfere in the pipeline, and it can eliminate the low and medium frequency noise The effect is better. Resistive and resistive mufflers used alone cannot effectively eliminate the noise of different frequency bands in the exhaust noise, which will greatly reduce the noise reduction effect of the muffler and fail to achieve the expected effect. At present, some manufacturers are also developing and improving impedance compound mufflers, but they are mainly aimed at fixed vehicle models, and their reliability, universality and interchangeability are not ideal.

Contents of the invention

The purpose of the present invention is to provide a novel impedance composite muffler, which can integrate the functions of a resistive muffler and a resistive muffler, and can control exhaust noise in different frequency bands better, and has the advantages of high reliability and wide application range. features.

The technical solution adopted

An impedance compound muffler, comprising: a shell assembly, a first exhaust tube, a cover, a first elbow, a first air intake cylinder, a second air intake cylinder, a second elbow pipe, a tee, a second exhaust cylinder and a built-in Composed of thin air intake cylinder; characterized in that:

The shell assembly is mainly composed of a left end cover, a first partition, a cylindrical shell, a right end cover, a second partition and a third partition.

The left end cover is connected to the left port of the cylindrical housing; the first partition is placed in the cylindrical housing on the right side of the left end cover; the third partition is placed in the cylindrical housing on the right side of the first partition; the second partition The plate is put into the cylindrical shell, the left end face of the second partition is against the right end face of the third partition, the first end face and the second end face of the second partition are against the inner surface of the cylindrical shell; the right end cover is connected with the cylindrical shell The upper part of the right port of the body, and the lower left end face of the right end cover is against the right end face of the second partition.

The right port of the second exhaust tube passes through the hole in the lower part of the left end cover, and is partially inserted into the first chamber of the shell assembly.

The first exhaust tube passes through the central hole of the first partition, the left part of the first exhaust tube is in the first cavity of the shell assembly, and the right part of the first exhaust tube is in the second cavity of the shell assembly.

The left port of the tee is connected to the right port of the first exhaust cylinder, and the tee is in the second cavity of the shell assembly.

The hole sleeve of the cover is connected to the left port of the tee, and the left port of the cover is against the left end face of the third dividing plate.

The lower port of the first elbow is connected to the upper port of the tee, and the right port of the first elbow passes through the first hole on the left side of the third dividing plate.

The upper port of the second elbow is connected to the lower port of the tee, and the right port of the second elbow passes through the third hole on the left side of the third dividing plate.

The left port of the second air intake tube is connected to the right port of the second elbow, and the second air intake tube is in the fourth cavity of the shell assembly.

The left port of the first air intake tube is connected to the right port of the first elbow, and the right port of the first air intake tube passes through the hole on the right end cover from the left.

The first group of resistive absorbing materials is filled in the space formed by the inner surface of the cover, the outer surface of the tee, the outer surface of the first elbow and the left end surface of the third partition.

The second group of resistive absorbent materials fills the space formed by the third cavity of the housing assembly, the outer surface of the first elbow and the outer surface of the first air cylinder, filling up.

The left port of the built-in fine air cylinder passes through the second hole of the third partition, the left end of the built-in fine air cylinder is in the second chamber of the shell assembly, and the right end of the built-in fine air cylinder is in the fourth cavity of the shell assembly.

The assembly consisting of the first elbow, the second elbow and the tee is replaced by a U-shaped pipe.

A plurality of small holes are opened on the first separating plate.

A plurality of small holes are opened on the cylinder wall of the second air intake cylinder.

A plurality of small holes are opened on the cylinder wall of the first air intake cylinder.

A plurality of small holes are opened on the cylinder wall of the tee.

A plurality of small holes are opened on the cylinder wall of the first elbow.

A plurality of small holes are opened on the cylinder wall of the second elbow.

The resistive absorbing material includes: sound-absorbing silk cotton and superfine glass wool.

advantage

The present invention realizes noise reduction by means of compound noise reduction, and has the advantage of being suitable for noise reduction in a relatively wide noise frequency range.

Description of drawings

Fig. 1 is the assembly schematic diagram of a kind of impedance compound muffler;

Fig. 2 is a sectional view along the direction A of Fig. 1;

Fig. 3 is a B-direction sectional view of Fig. 1;

Fig. 4 is a part diagram of the second dividing plate;

Fig. 5 is a structural schematic diagram of an impedance composite muffler housing;

Fig. 6 is a partially simplified assembly diagram of an impedance composite muffler.

detailed description

Example 1

An impedance composite muffler, comprising: a shell assembly, a first exhaust tube 3, a cover 4, a first elbow 6, a first air intake tube 10, a second air intake tube 11, a second elbow tube 13, a tee 14, The second exhaust tube 15 and the built-in thin air intake tube 17 are composed; it is characterized in that:

The shell assembly is mainly composed of a left end cover 1, a first partition 2, a cylindrical shell 7, a right end cover 9, a second partition 16 and a third partition 12;

The left end cover 1 is connected to the left port of the cylindrical housing 7; the first partition 2 is inserted into the cylindrical housing 7 on the right side of the left end cover 1; the third partition 12 is inserted into the cylindrical housing 7 inside the first partition 2; the second partition 16 is put into the cylindrical housing 7, the left end of the second partition 16 is against the right end of the third partition 12, the first end 21 of the second partition 16 and the second The end surface 22 is against the inner surface of the cylindrical housing 7; the right end cover 9 is connected to the upper part of the right port of the cylindrical housing 7, and the lower left end surface of the right end cover 9 is against the right end surface of the second partition 16;

The right port of the second exhaust tube 15 passes through the hole in the lower part of the left end cover 1, and is partially inserted into the first cavity 23 of the shell assembly;

The first exhaust tube 3 passes through the central hole of the first dividing plate 2, the left part of the first exhaust tube 3 is in the first chamber 23 of the shell assembly, and the right part of the first exhaust tube 3 is in the first cavity of the shell assembly. Inside the second chamber 24;

The left port of the tee 14 is connected to the right port of the first exhaust tube 3, and the tee 14 is in the second cavity 24 of the shell assembly;

The hole sleeve of the cover 4 is connected to the left port of the tee 14, and the right port of the cover 4 is against the left end face of the third dividing plate 12;

The lower port of the first elbow 6 is connected to the upper port of the tee 14, and the right port of the first elbow 6 passes through the first hole 18 on the left side of the third dividing plate 12;

The upper port of the second elbow 13 is connected to the lower port of the tee 14, and the right port of the second elbow 13 passes through the third hole 20 from the left side of the third dividing plate 12;

The left port of the second air intake cylinder 11 is connected to the right port of the second elbow 13, and the second air intake cylinder 11 is in the fourth cavity 26 of the shell assembly;

The left port of the first air intake cylinder 10 is connected to the right port of the first elbow 6, and the right port of the first air intake cylinder 10 passes through the hole on the right end cover 9 from the left;

The first group of resistive absorbing material 5 is filled in the space formed by the inner surface of the cover 4, the outer surface of the tee 14, the outer surface of the first elbow 6 and the left end surface of the third dividing plate 12, and fills up;

The second group of resistive absorbing material 8 is filled in the space formed by the third cavity 25 of the shell assembly, the outer surface of the first elbow 6 and the outer surface of the first air cylinder 10 , and fills up.

Example 2

Embodiment 2 of an impedance composite muffler is basically the same as Embodiment 1, the difference being:

The left port of the built-in thin air intake tube 17 passes through the second hole 19 of the third partition 12, the left end of the built-in thin air intake tube 17 is in the second cavity 24 of the shell assembly, and the right end of the built-in thin air intake tube 17 is in the second chamber of the shell assembly. In four chambers 26.

Example 3

Embodiment 3 of a compound impedance muffler is basically the same as Embodiment 1, the difference is that:

The assembly consisting of the first elbow 6 , the second elbow 13 and the tee 14 is replaced by a U-shaped pipe 27 .

Example 4

Embodiment 4 of a compound impedance muffler is basically the same as Embodiment 1, the difference being:

A plurality of small holes are opened on the first separator 2 .

Example 5

Embodiment 5 of a compound impedance muffler is basically the same as Embodiment 1, except that:

A plurality of small holes are opened on the cylinder wall of the second air intake cylinder 11 .

Example 6

Embodiment 6 of a compound impedance muffler is basically the same as Embodiment 1, except that:

A plurality of small holes are opened on the cylinder wall of the first air cylinder 10 .

Example 7

Embodiment 7 of a compound impedance muffler is basically the same as Embodiment 1, except that:

Have a plurality of small holes on the cylinder wall of tee 14.

Example 8

Embodiment 8 of a compound impedance muffler is basically the same as Embodiment 1, except that:

A plurality of small holes are opened on the cylinder wall of the first elbow 6 .

Example 9

Embodiment 9 of a compound impedance muffler is basically the same as Embodiment 1, except that:

A plurality of small holes are opened on the cylinder wall of the second elbow 13 .

Instructions

The air inlet of the present invention is connected to the noise source, the noise passes through the internal muffler system of the present invention, and when the noise reaches the exit, the noise will be greatly reduced.

working principle

The noise of the automobile mainly comes from mechanical friction, mechanical vibration and exhaust emission. The present invention mainly aims at reducing the noise generated by exhaust emission.

The noise source is connected to the gas receiving end of the present invention, and the noise source passes through the present invention in two ways. A pipe contains resistive passages of resistive material; a pipe has many small holes. When the noise passes through the two pipes, the section of the path is constantly changing to form a resistant channel. This creates resistive and reactive paths for noise.

The resistive channel can let most of the high-frequency sound waves enter the material, so that the sound waves are gradually exhausted, and the effect on high-frequency noise is better; the resistive channel muffler is mainly to bypass the resonant cavity on the pipeline or to make the area of the pipeline generate noise. The sudden change is selective for sound waves of different frequencies, causing reflection and interference of sound waves in the pipeline, and has a better noise reduction effect for low and intermediate frequency noise. The advantage of the invention is that the frequency range of noise reduction is relatively wide.

Claims (9)

1. An impedance composite muffler, comprising: a shell assembly, a first exhaust cylinder (3), a cover (4), a first elbow (6), a first air intake cylinder (10), a second air intake cylinder (11 ), a second elbow (13), a tee (14), a second exhaust tube (15) and a built-in thin air intake tube (17); it is characterized in that: The shell assembly is mainly composed of a left end cover (1), a first partition (2), a cylindrical shell (7), a right end cover (9), a second partition (16) and a third partition (12); The left end cover (1) is connected to the left port of the cylindrical housing (7); the first partition (2) is placed in the cylindrical housing (7) on the right side of the left end cover (1); the third partition (12) Put it into the cylindrical casing (7) on the right side of the first partition (2); put the second partition (16) into the cylindrical casing (7), and the left end of the second partition (16) is against the The right end surface of the third partition (12), the first end surface (21) and the second end surface (22) of the second partition (16) are against the inner surface of the cylindrical shell (7); the right end cover (9) is connected The upper part of the right port of the cylindrical shell (7), the lower left end surface of the right end cover (9) is against the right end surface of the second partition (16); The right port of the second exhaust cylinder (15) passes through the hole in the lower part of the left end cover (1), and partially puts it into the first cavity (23) of the shell assembly; The first exhaust tube (3) passes through the center hole of the first partition (2), the left part of the first exhaust tube (3) is in the first chamber (23) of the shell assembly, the first exhaust tube ( 3) The right part is in the second cavity (24) of the housing assembly; The left port of the tee (14) is connected to the right port of the first exhaust cylinder (3), and the tee (14) is in the second cavity (24) of the shell assembly; The hole sleeve of the cover (4) is connected to the left port of the tee (14), and the left port of the cover (4) is against the left end face of the third partition (12); The lower port of the first elbow (6) is connected to the upper port of the tee (14), and the right port of the first elbow (6) passes through the first hole (18) on the left side of the third partition (12) ; The upper port of the second elbow (13) is connected to the lower port of the tee (14), and the right port of the second elbow (13) passes through the third hole (20) on the left side of the third partition (12) ; The left port of the second air intake cylinder (11) is connected to the right port of the second elbow (13), and the second air intake cylinder (11) is in the fourth cavity (26) of the shell assembly; The left port of the first air intake cylinder (10) is connected to the right port of the first elbow (6), and the right port of the first air intake cylinder (10) passes through the hole on the right end cover (9) from the left; The first group of resistive absorbent material (5) is filled in the inner surface of the cover (4), the outer surface of the tee (14), the outer surface of the first elbow (6) and the left end of the third partition (12). The space formed by the surface fills up; The second group of resistive absorbing material (8) is filled in the space formed by the third chamber (25) of the shell assembly, the outer surface of the first elbow (6) and the outer surface of the first air inlet tube (10), filling up . 2. A kind of impedance composite muffler according to claim 1, characterized in that: The left port of the built-in thin air intake tube (17) passes through the second hole (19) of the third partition (12), the left end of the built-in thin air intake tube (17) is in the second chamber (24) of the shell assembly, and the built-in thin air intake tube (17) is in the second cavity (24) of the shell assembly. The right end of the air intake tube (17) is in the fourth cavity (26) of the shell assembly. 3. A kind of impedance composite muffler according to claim 1, characterized in that: The assembly consisting of the first elbow (6), the second elbow (13) and the tee (14) is replaced by a U-shaped pipe (27). 4. A compound impedance muffler according to claim 1, characterized in that: A plurality of small holes are opened on the first partition (2). 5. A kind of impedance composite muffler according to claim 1, characterized in that: A plurality of small holes are opened on the cylinder wall of the second air intake cylinder (11). 6. A kind of impedance composite muffler according to claim 1, characterized in that: A plurality of small holes are opened on the cylinder wall of the first air intake cylinder (10). 7. A compound impedance muffler according to claim 1, characterized in that: Have a plurality of small holes on the cylinder wall of tee (14). 8. A compound impedance muffler according to claim 1, characterized in that: A plurality of small holes are opened on the cylinder wall of the first elbow (6). 9. A compound impedance muffler according to claim 1, characterized in that: A plurality of small holes are opened on the cylinder wall of the second elbow (13).