CN110230532B

CN110230532B - High-efficient noise reduction's blast pipe

Info

Publication number: CN110230532B
Application number: CN201910552489.6A
Authority: CN
Inventors: 金建良; 张吉林; 梁成林
Original assignee: Huzhou Xinxing Automobile Parts Co ltd
Current assignee: Huzhou Xinxing Automobile Parts Co ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2024-08-13
Anticipated expiration: 2039-06-25
Also published as: CN110230532A

Abstract

The invention relates to an exhaust pipe capable of efficiently reducing noise, which comprises a barrel, an air inlet pipe, an air outlet pipe and a silencing pipe, wherein an expansion cavity, a first resonant cavity, a second resonant cavity and a third resonant cavity are arranged in the barrel; one part of the air outlet pipe extends into the second resonant cavity from the third resonant cavity, the part is provided with a second outlet hole, and the other part passes through the third resonant cavity from the second resonant cavity to the outer side of the cylinder body. In the treatment process of the gas passing through the expansion cavity, the first resonant cavity, the second resonant cavity and the third resonant cavity, the movement stroke of noise is greatly increased, so that the time of noise propagation is slowed down, and the noise reduction effect is improved.

Description

High-efficient noise reduction's blast pipe

Technical Field

The invention relates to the technical field of automobile exhaust pipes, in particular to an exhaust pipe capable of efficiently reducing noise.

Background

The exhaust duct of an automobile has been one of the main sources of noise for vehicles. Noise is typically generated by instability in the flow of high velocity air streams. The flowing air flow has the characteristics of high temperature, high pressure and high speed, and the emitted noise has high intensity, wide frequency spectrum and wide spread range, and seriously influences the physical health of drivers and passengers and the production and life of residents.

For example: the utility model of China with the application number 201220053248.0 discloses a noise-reducing automobile exhaust pipe, which comprises an exhaust pipe, wherein the exhaust pipe is divided into an upper joint, a lower joint and a cylinder body, the upper joint and the lower joint are in a funnel shape, the exhaust pipe is provided with a plurality of silencers and thin-wall inner containers, the number of the thin-wall inner containers is small, the noise-reducing effect is limited, and through holes on the thin-wall inner containers are easy to block and obstruct airflow.

Disclosure of Invention

The invention aims to provide an exhaust pipe capable of efficiently reducing noise and improving the noise reduction effect of the exhaust pipe.

The above object of the present invention is achieved by the following technical solutions: the utility model provides a high-efficient blast pipe that falls noise, includes barrel, intake pipe, outlet duct and amortization pipe, be provided with expansion chamber, first resonant cavity, second resonant cavity and third resonant cavity in the barrel, the intake pipe communicates in expansion chamber, the outlet duct communicates in third resonant cavity, amortization pipe sets up in first resonant cavity, and both ends communicate respectively in expansion chamber and third resonant cavity, be provided with first apopore on the amortization pipe; one part of the air outlet pipe extends into the second resonant cavity from the third resonant cavity, the part is provided with a second outlet hole, and the other part passes through the third resonant cavity from the second resonant cavity to the outer side of the cylinder body.

Preferably, the outer side of the silencing pipe is sleeved with a sleeve, and a silencing material is filled between the outer wall of the silencing pipe and the inner wall of the sleeve.

Preferably, the inner diameter of the silencer pipe gradually increases from two ends to the middle to form a drum-shaped structure.

Preferably, the inner wall of the third resonant cavity is of a hollow structure and is divided into a plurality of layers of resonant areas by an inner wall plate, and a through hole for communicating the third resonant cavity with the resonant areas is formed in the inner wall plate.

After entering the resonance areas of the layers through the through holes, the sound waves are continuously reflected by the inner wall plates until the sound waves are consumed.

Preferably, the aperture of the through-hole in the inner wall plate located on the inner side is larger than the aperture of the through-hole in the inner wall plate located on the outer side.

Preferably, the panel surface of the inner wall panel in the resonance area is provided with protrusions protruding from the panel surface, and the panel surface between two adjacent protrusions is provided with sound-absorbing blind holes.

The protrusion and the sound-absorbing blind hole can change the reflection path of the sound wave and prolong the reflection time of the sound wave.

Preferably, the expansion cavity is divided into a plurality of expansion chambers through a partition plate, the expansion chambers comprise a first expansion chamber, a second expansion chamber and a third expansion chamber which are sequentially arranged, two adjacent expansion chambers are communicated through a filtering hole, the air inlet pipe penetrates through the first expansion chamber and the second expansion chamber and then stretches into the third expansion chamber, and one end of the silencing pipe is communicated with the second expansion chamber.

Preferably, a third outlet hole is formed in the air inlet pipe located in the first expansion chamber, and the first expansion chamber is filled with sound absorption materials.

When the air flow enters the air inlet pipe, most high-frequency sound waves enter the first expansion chamber through the third outlet hole and are absorbed by the sound absorption material in the first expansion chamber, so that preliminary silencing is completed.

Preferably, the partition plate is divided into a fixed partition plate and a floating partition plate, the fixed partition plate is positioned between the first expansion chamber and the second expansion chamber and is fixed in the expansion cavity, the floating partition plate is positioned between the second expansion chamber and the third expansion chamber, the floating partition plate is sleeved on the air inlet pipe, and an elastic reset piece for pushing the floating partition plate to move towards the direction far away from the partition plate is arranged in the second expansion chamber.

When the air flow in the air inlet pipe is large, the air flow enters the third expansion chamber and then pushes the floating partition plate to move reversely, so that the space of the third expansion chamber is enlarged, noise sound waves are reflected and absorbed in the large space, and only sound waves with a few frequencies near the Kong Guyou frequency can enter the second expansion chamber through the filtering holes; when the air flow is reduced, the noise generated correspondingly is smaller, at the moment, the floating partition plate is reset under the action of the elastic reset piece, the space of the third expansion chamber is reduced, and the air flow rapidly passes through the third expansion chamber and then enters the second expansion chamber.

The invention has the following beneficial effects:

1. In the treatment process of the gas passing through the expansion cavity, the first resonant cavity, the second resonant cavity and the third resonant cavity, the movement stroke of noise is greatly increased, so that the time of noise propagation is slowed down, and the noise reduction effect is improved;

2. The inner wall of the third resonant cavity is of a hollow structure, sound waves are continuously reflected by the inner wall plate after entering the resonant areas of all layers through the through holes, and the reflection time of the sound waves is prolonged until the sound waves are consumed;

3. The movable floating diaphragm is capable of moving with the change in the intensity of the air flow to adaptively change the size of the space of the third expansion chamber.

Drawings

FIG. 1 is a schematic structural view of embodiment 1 of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic structural view of embodiment 2 of the present invention;

In the figure: 1-cylinder, 11-expansion chamber, 111-first expansion chamber, 112-second expansion chamber, 113-third expansion chamber, 12-first resonance chamber, 13-second resonance chamber, 14-third resonance chamber, 15-baffle, 15A-fixed baffle, 15B-floating baffle, 16-filter hole, 17-elastic reset piece, 2-air inlet pipe, 21-third outlet hole, 3-air outlet pipe, 31-second outlet hole, 4-muffler pipe, 41-first outlet hole, 5-sleeve, 6-inner wall plate, 61-through hole, 62-bulge, 63-sound absorbing blind hole and 7-resonance area.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention, may be made by those skilled in the art after reading the present specification, are only protected by patent laws within the scope of the claims of the present invention.

Example 1: as shown in fig. 1 and 2, an exhaust pipe capable of efficiently reducing noise comprises a barrel 1, an air inlet pipe 2, an air outlet pipe 3 and a silencing pipe 4, wherein an expansion cavity 11, a first resonant cavity 12, a second resonant cavity 13 and a third resonant cavity 14 are arranged in the barrel 1, the expansion cavity 11 and the third resonant cavity 14 are positioned at two ends of the barrel 1, and the first resonant cavity 12 and the second resonant cavity 13 are positioned in the middle of the barrel 1.

The air inlet pipe 2 is communicated with the expansion cavity 11, the air outlet pipe 3 is communicated with the third resonant cavity 14, the silencing pipe 4 is arranged in the first resonant cavity 12, two ends of the silencing pipe are respectively communicated with the expansion cavity 11 and the third resonant cavity 14, a first outlet 41 is formed in the silencing pipe 4, and the silencing pipe 4 is communicated with the first resonant cavity 12 through the first outlet 41.

The air outlet pipe 3 is of a U-shaped bending structure, one part of the air outlet pipe 3 extends into the second resonant cavity 13 from the third resonant cavity 14, a second outlet hole 31 is formed in the part of the air outlet pipe, the air outlet pipe 3 is communicated with the second resonant cavity 13 through the second outlet hole 31, and the other part of the air outlet pipe passes through the third resonant cavity 14 from the second resonant cavity 13 to the outer side of the cylinder body 1.

The sleeve 5 is sleeved on the outer side of the silencing pipe 4, and the sleeve 5 wraps the outer side of the first outlet hole 41. A silencing material is filled between the outer wall of the silencing pipe 4 and the inner wall of the sleeve 5, and the silencing material is foamed aluminum.

As shown in fig. 2, the inner wall of the third resonant cavity 14 is of a hollow structure and is divided into a plurality of layers of resonant areas 7 by an inner wall plate 6, and a through hole 61 for communicating the third resonant cavity 14 with the resonant areas 7 is provided in the inner wall plate 6. The aperture of the through hole 61 in the inner wall plate 6 located on the inner side is larger than the aperture of the through hole 61 in the inner wall plate 6 located on the outer side. The inner wall plate 6 is provided with a protrusion 62 protruding from the plate surface on the plate surface in the resonance region 7, and a sound absorbing blind hole 63 is arranged on the plate surface between two adjacent protrusions 62.

The expansion chamber 11 is divided into a plurality of expansion chambers by a partition plate 15, the expansion chambers comprise a first expansion chamber 111, a second expansion chamber 112 and a third expansion chamber 113 which are sequentially arranged, the two adjacent expansion chambers are communicated through a filtering hole 16, the air inlet pipe 2 penetrates through the first expansion chamber 111 and the second expansion chamber 112 and then stretches into the third expansion chamber 113, and one end of the silencing pipe 4 is communicated with the second expansion chamber 112. The air inlet pipe 2 in the first expansion chamber 111 is provided with a third outlet hole 21, the first expansion chamber 111 is filled with sound absorbing materials, the sound absorbing materials are glass fiber wires and felts, and the glass fiber wires and the felts are distributed in a staggered and laminated mode along the length direction of the cylinder body 1.

When the air flow enters the expansion cavity 11 from the air inlet pipe 2, high-frequency sound waves enter the first expansion chamber 111 through the third outlet hole 21, and the sound absorption material of the first expansion chamber 111 is used for preliminary noise reduction; the air flow then enters the third expansion chamber 113, and only a few sound waves with frequencies near the natural frequency of the through hole 8 can reach the second expansion chamber 112 through the through hole 8, while the other sound waves with few frequencies can not pass through the filtering holes 16 and can be continuously reflected in the third expansion chamber 113 until the air flow momentum disappears, so that the secondary noise reduction is completed; the air flow in the second expansion chamber 112 enters the third resonant cavity 14 through the silencing pipe 4, and when the air flow passes through the silencing pipe 4, sound waves enter the sleeve 5 on the outer side through the first outlet hole 41 for three times of noise reduction; the gas entering the third resonant cavity 14 passes through the hollow inner wall of the third resonant cavity 14, so that sound waves with various frequencies are reflected and absorbed in each layer of resonant area 7, and four times of noise reduction are completed; the third resonant cavity 14 is then exhausted through the outlet duct 3, and before being exhausted, part of the air flow enters the second resonant cavity 13 through the second outlet hole 31, and five times of noise reduction are completed in the second resonant cavity 13.

Example 2: as shown in fig. 3, the difference from embodiment 1 is that the inner diameter of the muffler pipe 4 gradually increases from both ends to the middle, forming a drum-shaped structure.

The partition plate 15 is divided into a fixed partition plate 15A and a floating partition plate 15B, the fixed partition plate 15A is positioned between the first expansion chamber 111 and the second expansion chamber 112 and fixed in the expansion chamber 11, the floating partition plate 15B is positioned between the second expansion chamber 112 and the third expansion chamber 113, the floating partition plate 15B is sleeved on the air inlet pipe 2, an elastic reset piece 17 for pushing the floating partition plate 15B to move in a direction far away from the partition plate 15 is arranged in the second expansion chamber 112, and the elastic reset piece 17 is a spring.

Claims

1. The utility model provides an blast pipe of high-efficient noise reduction, includes barrel (1), intake pipe (2), outlet duct (3) and muffler pipe (4), its characterized in that: an expansion cavity (11), a first resonant cavity (12), a second resonant cavity (13) and a third resonant cavity (14) are arranged in the cylinder body (1), the air inlet pipe (2) is communicated with the expansion cavity (11), the air outlet pipe (3) is communicated with the third resonant cavity (14), the silencing pipe (4) is arranged in the first resonant cavity (12), two ends of the silencing pipe are respectively communicated with the expansion cavity (11) and the third resonant cavity (14), and a first outlet hole (41) is formed in the silencing pipe (4); one part of the air outlet pipe (3) extends into the second resonant cavity (13) from the third resonant cavity (14), a second outlet hole (31) is formed in the part, and the other part of the air outlet pipe penetrates through the third resonant cavity (14) from the second resonant cavity (13) to the outer side of the cylinder body (1);

The outer side of the silencing pipe (4) is sleeved with a sleeve (5), and a silencing material is filled between the outer wall of the silencing pipe (4) and the inner wall of the sleeve (5);

The inner diameter of the silencing pipe (4) is gradually increased from two ends to the middle to form a drum-shaped structure;

The inner wall of the third resonant cavity (14) is of a hollow structure and is divided into a plurality of layers of resonant areas (7) through an inner wall plate (6), and a through hole (61) for communicating the third resonant cavity (14) with the resonant areas (7) is formed in the inner wall plate (6); the aperture of the through hole (61) on the inner wall plate (6) on the inner side is larger than that of the through hole (61) on the inner wall plate (6) on the outer side; the panel surface of the inner wall panel (6) positioned in the resonance area (7) is provided with a bulge (62) protruding out of the panel surface, and a sound absorption blind hole (63) is arranged on the panel surface positioned between two adjacent bulges (62);

The expansion cavity (11) is divided into a plurality of expansion chambers by a partition plate (15), the expansion chambers comprise a first expansion chamber (111), a second expansion chamber (112) and a third expansion chamber (113) which are sequentially arranged, two adjacent expansion chambers are communicated through a filter hole (16), the air inlet pipe (2) penetrates through the first expansion chamber (111) and the second expansion chamber (112) and then stretches into the third expansion chamber (113), and one end of the silencing pipe (4) is communicated with the second expansion chamber (112); a third outlet hole (21) is formed in the air inlet pipe (2) positioned in the first expansion chamber (111), and the first expansion chamber (111) is filled with sound absorption materials;

The partition board (15) is divided into a fixed partition board (15A) and a floating partition board (15B), the fixed partition board (15A) is positioned between the first expansion chamber (111) and the second expansion chamber (112) and is fixed in the expansion cavity (11), the floating partition board (15B) is positioned between the second expansion chamber (112) and the third expansion chamber (113), the floating partition board (15B) is sleeved on the air inlet pipe (2), and an elastic reset piece (17) for pushing the floating partition board (15B) to move towards a direction far away from the fixed partition board (15A) is arranged in the second expansion chamber (112); the elastic reset piece (17) is a spring sleeved with the air inlet pipe (2), a first elastic end of the spring is connected with the air inlet pipe (2), and a second elastic end of the spring is connected with the floating partition plate (15B).