CN213743599U

CN213743599U - Engine silencer

Info

Publication number: CN213743599U
Application number: CN202023042610.8U
Authority: CN
Inventors: 马付兵
Original assignee: Xiangyan Chu'an Science & Technology Industrial Co ltd
Current assignee: Xiangyan Chu'an Science & Technology Industrial Co ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-07-20
Anticipated expiration: 2030-12-16

Abstract

An engine silencer comprises a shell, an air inlet pipe, an exhaust pipe and a silencing pipe; the two ends of the shell are sealed through a left end cover and a right end cover, two parallel clapboards are arranged inside the shell, the two clapboards divide the shell into a chamber, a chamber and a chamber, c3 chambers are formed in the shell, and each clapboard is provided with a through hole for supporting and fixing the silencing pipe; the inner wall of the shell is provided with a perforated pipe for fixing the sound absorption material, the perforated pipe is uniformly provided with holes, and the area of the holes accounts for more than 35% of the total area of the pipe wall of the perforated pipe; one end of the silencing pipe is welded and fixed with the left end cover, the other end of the silencing pipe is positioned at the rear half part of the chamber c, the end head of the silencing pipe is provided with a second blocking cover plate, and four groups of through holes d, e, f and g are arranged on the pipe wall of the silencing pipe; the air inlet pipe penetrates through the shell in the radial direction to be communicated with the cavity a, the exhaust pipe penetrates through the shell in the radial direction to be communicated with the cavity c, and the central axes of the air inlet pipe and the exhaust pipe are parallel; the noise reduction effect is obvious; meanwhile, large exhaust resistance cannot be generated, and the power loss of the engine is not large; the heat insulation effect is obvious.

Description

Engine silencer

Technical Field

The utility model relates to a silencer specifically is an engine silencer.

Background

A muffler (muffler) is a device that allows airflow to pass through but prevents or reduces sound transmission, and is an important measure for eliminating aerodynamic noise. The muffler can block the propagation of sound waves and allow air flow to pass through, and is an effective tool for controlling noise. A muffler may therefore be installed behind the exhaust pipe connected to the engine for reducing engine exhaust noise.

However, the existing mufflers mostly adopt an anti-muffler, and the anti-muffler reflects part of sound waves back to the sound source direction through the sudden change of acoustic characteristics in the pipeline so as to achieve the muffling purpose. Such mufflers have the following disadvantages:

1) the noise reduction effect is not too obvious;

2) large exhaust resistance is generated, so that the power loss of the engine is large;

3) the heat insulation effect is not good, and other components such as an engine and a cab can be affected.

SUMMERY OF THE UTILITY MODEL

The invention of the utility model aims to overcome the defects of the prior art, and provides an engine silencer, which improves the silencing efficiency and effect; the exhaust is smooth, and resistance can not be generated to the exhaust of the engine.

The technical scheme of the utility model lies in: an engine silencer comprises a shell, an air inlet pipe, an exhaust pipe and a silencing pipe; the two ends of the shell are sealed through a left end cover and a right end cover, two parallel clapboards are arranged inside the shell, the two clapboards divide the shell into a chamber, a chamber and a chamber, c3 chambers are formed in the shell, and each clapboard is provided with a through hole for supporting and fixing the silencing pipe; the inner wall of the shell is provided with a perforated pipe for fixing the sound absorption material, the perforated pipe is uniformly provided with holes, and the area of the holes accounts for more than 35% of the total area of the pipe wall of the perforated pipe;

one end of the silencing pipe is welded and fixed with the left end cover, the other end of the silencing pipe is positioned at the rear half part of the cavity c, the end head of the silencing pipe is provided with a second blocking cover plate, four groups of through holes d, e, f and g are arranged on the pipe wall of the silencing pipe, wherein the through hole group d is positioned in the cavity a, the through hole group g is positioned in the cavity c, the through hole groups e and f are positioned in the cavity b, and the first blocking cover plate is arranged in the silencing pipe between the through hole group e and the through hole group f; the central axis of the silencing pipe is flush with the central axis of the shell;

the air inlet pipe penetrates through the shell in the radial direction to be communicated with the cavity a, the exhaust pipe penetrates through the shell in the radial direction to be communicated with the cavity c, and the central axes of the air inlet pipe and the exhaust pipe are parallel; the air inlet pipe, the silencing pipe and the exhaust pipe form an exhaust passage.

Chamber a is longer than chamber b, which is longer than chamber c.

Each group of through hole groups consists of a plurality of through holes, and the number of the through holes of the through hole group d is more than that of the other three groups of through holes.

The sound absorption material is superfine glass fiber cotton with higher sound absorption coefficient.

The shell, the left end cover and the right end cover are externally coated with heat-insulating shells.

The heat preservation shell adopts high temperature resistant fiber cloth.

Gaps are reserved among the air inlet pipe, the exhaust pipe and the silencing pipe.

The air inlet pipe, the exhaust pipe and the muffler pipe are all cylindrical metal pipes.

Compared with the prior art, the utility model has obvious noise reduction effect; meanwhile, large exhaust resistance cannot be generated, and the power loss of the engine is not large; the heat insulation effect is obvious.

Drawings

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

in the figure: 1. the sound-absorbing material comprises a left end cover, 2, a heat-insulating shell, 3, an air inlet pipe, 4, first partition plates, 5, a sound-absorbing material, 6, a sound-absorbing pipe, 7, a perforated pipe, 8, first blocking cover plates, 9, second partition plates, 10, second blocking cover plates, 11, a shell, 12, an exhaust pipe, 13 and a right end cover.

Detailed Description

The invention is further described with reference to the following figures and examples.

In fig. 1, two ends of a shell 11 are sealed by a left end cover 1 and a right end cover 13, a three-cavity structure of a cavity a, a cavity b and a cavity c is formed inside the shell through a first partition plate 4 and a second partition plate 9, the length of the cavity a is larger than that of the cavity b, the length of the cavity b is larger than that of the cavity c, and the noise reduction effect is obvious; through holes for installing the silencing tubes 6 are formed in the first partition plate 4 and the second partition plate 9, the central axes of the silencing tubes 6 are flush with the central axis of the shell 11, the left end of each silencing tube is welded and fixed on the left end cover 1, the right end of each silencing tube sequentially penetrates through the through holes in the first partition plate 4 and the second partition plate 9 to penetrate through the cavity a, the cavity b and the cavity c, the right end of each silencing tube is finally located in the rear half part of the cavity c, and a blocking cover plate II 10 is installed at the end of each silencing tube; the muffling tube 6 is a perforated tube, four groups of through hole groups d, e, f and g are arranged on the tube wall, wherein the through hole group d is positioned in the cavity a, the through hole group g is positioned in the cavity c, the through hole groups e and f are positioned in the cavity b, a first blocking cover plate 8 is arranged in the muffling tube 6 between the through hole group e and the through hole group f, each group of through holes consists of a plurality of through holes, and the number of the through holes of the through hole group d is more than that of the other three groups of through holes; the inner wall of the shell 11 is provided with the perforated pipe 7, the aperture ratio is more than 35%, the perforated pipe is used for fixing the sound absorption material 5, and meanwhile, the sound absorption material 5 can absorb sound and reduce noise through the small holes, so that the noise reduction effect is improved; the sound absorption material 5 is superfine glass fiber cotton with higher sound absorption coefficient and has a heat insulation function; the air inlet pipe 3 penetrates through the shell 11 in the radial direction to be communicated with the cavity a, the exhaust pipe 12 penetrates through the shell 11 in the radial direction to be communicated with the cavity c, the central axes of the air inlet pipe 3 and the exhaust pipe 12 are parallel, and gaps are reserved among the air inlet pipe 3, the exhaust pipe 12 and the muffler pipe 6; the air inlet pipe 3, the muffler pipe 6 and the exhaust pipe 12 form an exhaust passage; the first blocking cover plate 8 and the second blocking cover plate 10 are arranged in the silencing pipe 6 and are used for blocking air flow so as to change the direction of the air flow; the outside cladding of casing 11, left end lid 1 and right end lid 13 has insulation housing 2, and insulation housing 2 adopts high temperature resistant fiber cloth, and high temperature resistant fiber cloth is a high temperature resistant material, wraps up in the silencer outside outward, can insulate against heat, also has the noise reduction function simultaneously. The intake pipe 3, the exhaust pipe 12 and the muffler pipe 6 are all cylindrical metal pipes.

Claims

1. An engine muffler characterized in that: comprises a shell (11), an air inlet pipe (3), an air outlet pipe (12) and a silencing pipe (6); the two ends of the shell (11) are sealed through a left end cover (1) and a right end cover (13), two parallel partition plates are arranged inside the shell (11), the two partition plates divide the interior of the shell (11) into 3 chambers, a, b and c, and each partition plate is provided with a through hole for supporting and fixing the silencing pipe (6); the inner wall of the shell (11) is provided with a perforated pipe (7) for fixing the sound absorption material (5), the perforated pipe (7) is uniformly perforated, and the area of the perforated pipe accounts for more than 35% of the total area of the pipe wall of the perforated pipe (7);

one end of the muffling tube (6) is welded and fixed with the left end cover (1), the other end of the muffling tube is positioned at the rear half part of the cavity c, and the end of the muffling tube is provided with a second blocking cover plate (10), the tube wall of the muffling tube (6) is provided with four groups of through holes d, e, f and g, wherein the through hole group d is positioned in the cavity a, the through hole group g is positioned in the cavity c, the through hole groups e and f are positioned in the cavity b, and a first blocking cover plate (8) is arranged in the muffling tube (6) between the through hole group e and the through hole group f; the central axis of the silencing pipe (6) is flush with the central axis of the shell (11);

the air inlet pipe (3) penetrates through the shell (11) along the radial direction to be communicated with the chamber a, the exhaust pipe (12) penetrates through the shell (11) along the radial direction to be communicated with the chamber c, and the central axes of the air inlet pipe (3) and the exhaust pipe (12) are parallel; the air inlet pipe (3), the silencing pipe (6) and the exhaust pipe (12) form an exhaust channel.

2. The engine muffler of claim 1, wherein: chamber a is longer than chamber b, which is longer than chamber c.

3. An engine muffler according to claim 1 or 2, characterized in that: each group of through hole groups consists of a plurality of through holes, and the number of the through holes of the through hole group d is more than that of the other three groups of through holes.

4. The engine muffler of claim 1, wherein: the sound absorption material (5) is superfine glass fiber cotton with higher sound absorption coefficient.

5. The engine muffler of claim 1, wherein: the shell (11), the left end cover (1) and the right end cover (13) are externally coated with a heat-insulating shell (2).

6. The engine muffler of claim 5, wherein: the heat preservation shell (2) adopts high temperature resistant fiber cloth.

7. The engine muffler of claim 1, wherein: gaps are reserved among the air inlet pipe (3), the exhaust pipe (12) and the silencing pipe (6).

8. An engine muffler according to claim 1 or 7, characterized in that: the air inlet pipe (3), the exhaust pipe (12) and the muffler pipe (6) are all cylindrical metal pipes.