CN211924286U

CN211924286U - Multi-cavity multi-stage wide-frequency silencer

Info

Publication number: CN211924286U
Application number: CN201922040715.0U
Authority: CN
Inventors: 梅东兴; 梅冬生; 季振林; 肖友洪; 严桂芳
Original assignee: Jiangsu Yean Industry Environmental Protection Equipment Technology Co ltd
Current assignee: Jiangsu Yean Industry Environmental Protection Equipment Technology Co ltd
Priority date: 2019-11-23
Filing date: 2019-11-23
Publication date: 2020-11-13
Anticipated expiration: 2029-11-23

Abstract

The utility model discloses a multi-cavity multi-stage broadband silencer, which comprises a primary silencer cylinder and an air inlet pipe, wherein the cylinder cavity of the primary silencer cylinder is divided into a right expansion cavity, a middle expansion cavity and a left expansion cavity by two silencer partition plates, and primary silencer perforated pipes are fixedly supported on the two separated silencer partition plates; the outer cylinder wall of the primary silencer cylinder is fixedly supported with a secondary silencer cylinder, a cylinder cavity of the secondary silencer cylinder is internally provided with a secondary silencer perforated pipe, sound absorption materials are filled between the secondary silencer cylinder and the secondary silencer perforated pipe, and an air outlet pipe communicated with the secondary silencer perforated pipe is arranged on the right end plate of the secondary silencer; one end of the muffler connecting pipe is communicated with the second-stage muffler perforated pipe, and the other end of the muffler connecting pipe is communicated with the left expansion cavity of the first-stage muffler cylinder. The silencer has the characteristics of compact structure and reasonable design, can realize broadband silencing, and is particularly suitable for ventilation systems of underground projects such as subways and tunnels.

Description

Multi-cavity multi-stage wide-frequency silencer

Technical Field

The utility model relates to a ventilation system's silencer especially relates to ventilation system silencers of underground works such as subway, tunnel.

Background

With the rapid development of city construction in China, subways become important transportation systems with high density and high transportation volume in cities; because subway stations are often located in busy urban areas, if the noise elimination design is improper, noise can disturb residents, and particularly, areas with high noise requirements, such as residential houses, schools and hospitals, can also cause severe influence, the noise elimination design of the subway ventilation system is a very sensitive problem in urban environmental engineering.

Noise sources of tunnel projects such as subways mainly comprise piston wind airflow noise generated by dragging and pushing tunnel air when a subway train runs, whole train vibration caused by reasons such as flat centers of train wheels and uneven tracks, noise generated by running of traction equipment, running noise of equipment such as train air conditioners and fan noise of a ventilation system, wherein the fan noise mainly comes from aerodynamic noise, mechanical noise and electric noise, and the aerodynamic noise mainly comprises rotational noise and eddy noise; the air flow noise and the rotation noise are mainly medium-low frequency noise, the eddy noise is a continuous noise spectrum, and medium-high frequency components are more prominent, so that the subway ventilation system has the characteristics of wide noise frequency spectrum and high intensity.

In the prior art, a silencer is used for weakening ventilation noise of ventilation systems of tunnel projects such as subways, and the silencing effect of the silencer depends on the internal structure and the volume of the silencer and the matching performance of an engine. The existing silencer mainly has three main types: an anti-muffler, a resistive muffler and an impedance hybrid muffler. The reactive muffler mainly reduces the sound energy propagating downstream through reflection and interference of sound waves, and generally has good low-frequency attenuation performance. The resistive muffler absorbs sound energy through the built-in sound absorption material to reduce the downstream transmission, can effectively reduce medium-high frequency noise, but has poor low-frequency performance. The impedance composite muffler is the synthesis of the two structures, and the optimally designed impedance composite muffler has the muffling effects of low, medium and high frequencies. At present, a ventilation noise silencer of a ventilation system of tunnel engineering such as iron and the like is an expansion silencer mainly used for eliminating medium and low frequency noise, and the noise silencer is often narrow in silencing frequency band and difficult to cover noise frequency band with high sound wave.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a multi-chamber multistage wide band silencer that reasonable in design can realize the broadband noise elimination is provided.

In order to solve the technical problem, the utility model discloses a multistage wide band silencer of multicavity, including the one-level silencer barrel, the both ends of this one-level silencer barrel are fixedly connected with one-level silencer left end board and one-level silencer right end board respectively, are provided with the intake pipe on the one-level silencer right end board with running through, the barrel intracavity of one-level silencer barrel is fixed and is provided with two silencer baffles of mutual interval, and these two silencer baffles divide the barrel chamber of one-level silencer barrel into right expansion chamber, middle expansion chamber and left expansion chamber, and fixed support has the one-level silencer perforated pipe on two silencer baffles of interval, and one end of this one-level silencer perforated pipe leads to expansion chamber to the right, and the other end of one-level silencer perforated pipe leads to expansion; a secondary muffler cylinder is fixedly supported on the outer cylinder wall of the primary muffler cylinder, a secondary muffler left end plate and a secondary muffler right end plate are respectively and fixedly connected to two ends of the secondary muffler cylinder, a secondary muffler perforated pipe is arranged in a cylinder cavity of the secondary muffler cylinder, a sound absorbing material is filled between the secondary muffler cylinder and the secondary muffler perforated pipe 8), and an air outlet pipe communicated with the secondary muffler perforated pipe is arranged on the secondary muffler right end plate; one end of the muffler connecting pipe penetrates through the left end plate of the secondary muffler and is communicated with the perforated pipe of the secondary muffler, and the other end of the muffler connecting pipe penetrates through the cylinder wall of the primary muffler cylinder and is communicated with the left expansion cavity of the primary muffler cylinder.

Furthermore, the penetration rate of the extending section of the muffler connecting pipe extending to the left expansion cavity of the first-stage muffler cylinder is 25% -30%, and the penetration aperture is 4-6 mm.

Furthermore, the perforation rate of the perforated pipe of the primary muffler is 25% -30%, and the perforation aperture is 4-6 mm.

Furthermore, the central lines of the secondary muffler cylinder and the secondary muffler perforated pipe are parallel to the central line of the primary muffler cylinder.

Furthermore, 2-8 silencer connecting pipes are penetratingly supported on the silencer partition plate.

Furthermore, the perforation rate of the secondary muffler perforated pipe is 25% -30%, and the perforation aperture is 4-8 mm.

Furthermore, the second-stage silencer cylinder is fixedly connected to the first-stage silencer cylinder through a connecting piece.

Furthermore, the sound absorption material is rock wool or glass fiber, and glass fiber cloth is lined between the rock wool or the glass fiber and the perforated pipe of the secondary muffler.

In the structure, the air inlet pipe is penetratingly arranged on the right end plate of the primary silencer, two silencer partition plates which are mutually spaced are fixedly arranged in the cylinder cavity of the primary silencer cylinder body, the cylinder cavity of the primary silencer cylinder body is divided into a right expansion cavity, a middle expansion cavity and a left expansion cavity by the two silencer partition plates, the primary silencer perforated pipe is fixedly supported on the two silencer partition plates which are spaced, one end of the primary silencer perforated pipe is communicated with the right expansion cavity, and the other end of the primary silencer perforated pipe is communicated with the left expansion cavity; airflow enters the left expansion cavity, the middle expansion cavity and the right expansion cavity through the air inlet pipe and the first-stage silencer perforated pipe to form an air inlet flow passage and an air outlet flow passage which expand and shrink prominently, and sound waves mutate in the cross section of the expansion and contraction pipeline to cause the mutation of acoustic impedance in the passage, so that the propagation direction of the sound waves is changed, and the sound waves are reflected and interfered in the pipeline, thereby effectively realizing the silencing of middle and low frequency noise; particularly, after the first-stage silencer perforated pipes are adopted, air flows of the silencer connecting pipes meet in the expansion cavity, multi-path sound waves interfere with each other, and low-frequency and medium-frequency noise is further reduced as a result of the interference, so that a good silencing effect from low frequency to high frequency is formed. And because the second-stage silencer perforated pipe is arranged in the cylinder cavity of the second-stage silencer cylinder, the sound absorption material is filled between the second-stage silencer cylinder and the second-stage silencer perforated pipe, and the second-stage silencer perforated pipe and the sound absorption material form a resistive silencing structure, the sound energy is converted into heat energy by using friction, viscosity and damping action to be dissipated, and the medium-frequency and high-frequency silencing performance is good. The composite structure of the first-stage silencer and the second-stage silencer can effectively reduce medium-high frequency noise, has good low-frequency attenuation performance and has low, medium and high frequency broadband silencing effects. The muffler connecting pipe is adopted to connect the primary resistive muffler and the secondary resistive muffler, so that the structure is compact, the design is reasonable, and the muffler is more suitable for muffling of ventilation systems of underground projects such as subways and tunnels.

Drawings

The multi-cavity multi-stage broadband muffler of the present invention will be further described with reference to the accompanying drawings and the following detailed description.

Fig. 1 is a schematic main sectional view of a multi-cavity multi-stage broadband muffler according to an embodiment of the present invention.

In the figure, 1-first stage silencer cylinder, 2-first stage silencer connecting pipe, 3-silencer clapboard,

4-a left end plate of a first-stage silencer, 5-a silencer connecting pipe, 6-a left end plate of a second-stage silencer,

7-second-stage silencer cylinder, 8-second-stage silencer perforated pipe, 9-second-stage silencer right end plate, 10-outlet pipe, 11-connecting piece, 12-first-stage silencer right end plate, 13-inlet pipe, 14-right expansion cavity, 15-middle expansion cavity and 16-left expansion cavity.

Detailed Description

The two-stage wide-frequency silencer shown in fig. 1 comprises a first-stage silencer cylinder 1 and a second-stage silencer cylinder 7; the primary silencer cylinder 1 and the secondary silencer cylinder 7 are cylindrical rolled steel plate structures. The two ends of the primary silencer cylinder body 1 are respectively and fixedly connected with a primary silencer left end plate 4 and a primary silencer right end plate 12, the primary silencer cylinder body 1 and the primary silencer left end plate 4 and the primary silencer right end plate 12 at the two ends of the primary silencer cylinder body enclose a silencer primary cylinder body, and an air inlet pipe 13 is arranged on the primary silencer right end plate 12 in a penetrating mode. Two mutually-spaced silencer partition plates 3 are fixedly arranged in a cylinder cavity of the primary silencer cylinder body 1, the cylinder cavity of the primary silencer cylinder body 1 is divided into a right expansion cavity 14, a middle expansion cavity 15 and a left expansion cavity 16 by the two silencer partition plates 3, four primary silencer perforated pipes 2 are fixedly supported on the two separated silencer partition plates 3, and of course, 2-8 primary silencer connecting pipes 2 are preferentially supported on the silencer partition plates 3. One end of the primary muffler perforated pipe 2 is communicated with a right expansion cavity 14, and the other end of the primary muffler perforated pipe 2 is communicated with a left expansion cavity 16; the first-stage silencer perforated pipe 2 has the perforation rate of 25% -30% and the perforation aperture of 4-6 mm, and the first-stage silencer perforated pipe 2 leads to the middle expansion cavity 15 through the perforations on the first-stage silencer perforated pipe.

A second-stage silencer cylinder 7 is fixedly supported on the outer cylinder wall of the first-stage silencer cylinder 1, and the second-stage silencer cylinder 7 is fixedly connected to the first-stage silencer cylinder 1 through a connecting piece 11. The two ends of the secondary muffler cylinder 7 are fixedly connected with a secondary muffler left end plate 6 and a secondary muffler right end plate 9 respectively, a secondary muffler perforated pipe 8 is arranged in a cylinder cavity of the secondary muffler cylinder 7, and a sound absorption material is filled between the secondary muffler cylinder 7 and the secondary muffler perforated pipe 8 and is rock wool or glass fiber. An air outlet pipe 10 communicated with the second-stage silencer perforated pipe 8 is arranged on the right end plate 8 of the second-stage silencer; one end of the muffler connecting pipe 5 penetrates through the left end plate 6 of the secondary muffler to be communicated with the perforated pipe 8 of the secondary muffler, the other end of the muffler connecting pipe 5 penetrates through the wall of the primary muffler cylinder 1 to be communicated with the left expansion cavity of the primary muffler cylinder 1, and the muffler connecting pipe 5 is a right-angle bent pipe. The central lines of the secondary muffler cylinder 7 and the secondary muffler perforated pipe 8 are parallel to the central line of the primary muffler cylinder 1; the air inlet pipe 13 is communicated with the right expansion cavity, and the muffler connecting pipe 5 is communicated with the left expansion cavity. The penetration rate of the extending section of the muffler connecting pipe 5 extending to the left expansion cavity 16 of the first-stage muffler cylinder 1 is 25% -30%, and the penetration aperture is 4-6 mm. The perforation rate of the secondary muffler perforated pipe 8 is 25% -30%, and the perforation aperture is 4-8 mm. Glass fiber cloth is lined between sound absorption materials such as rock wool or glass fiber and the second-stage silencer perforated pipe 8.

Claims

1. The utility model provides a multistage wide band silencer of multicavity, includes one-level silencer barrel (1), and the both ends difference fixedly connected with one-level silencer left end board (4) and one-level silencer right side end board (12) of this one-level silencer barrel (1) are provided with intake pipe (13), its characterized in that with running through on one-level silencer right side end board (12): two mutually-spaced silencer partition plates (3) are fixedly arranged in a cylinder cavity of the primary silencer cylinder body (1), the cylinder cavity of the primary silencer cylinder body (1) is divided into a right expansion cavity (14), a middle expansion cavity (15) and a left expansion cavity (16) by the two silencer partition plates (3), a primary silencer perforated pipe (2) is fixedly supported on the two separated silencer partition plates (3), one end of the primary silencer perforated pipe (2) is communicated with the right expansion cavity (14), and the other end of the primary silencer perforated pipe (2) is communicated with the left expansion cavity (16); a secondary muffler cylinder (7) is fixedly supported on the outer cylinder wall of the primary muffler cylinder (1), two ends of the secondary muffler cylinder (7) are fixedly connected with a secondary muffler left end plate (6) and a secondary muffler right end plate (9) respectively, a secondary muffler perforated pipe (8) is arranged in a cylinder cavity of the secondary muffler cylinder (7), a sound absorbing material is filled between the secondary muffler cylinder (7) and the secondary muffler perforated pipe (8), and an air outlet pipe (10) communicated with the secondary muffler perforated pipe (8) is mounted on the secondary muffler right end plate (9); one end of the muffler connecting pipe (5) penetrates through the left end plate (6) of the secondary muffler to be communicated with the perforated pipe (8) of the secondary muffler, and the other end of the muffler connecting pipe (5) penetrates through the wall of the primary muffler cylinder (1) to be communicated with the left expansion cavity (16) of the primary muffler cylinder (1).

2. The multi-cavity, multi-stage, wide-frequency muffler of claim 1, wherein: the penetration rate of the muffler connecting pipe (5) extending to the extending section of the left expansion cavity (16) of the primary muffler barrel (1) is 25% -30%, and the penetration diameter is 4-6 mm.

3. The multi-cavity, multi-stage, wide-frequency muffler of claim 1, wherein: the first-stage silencer perforated pipe (2) has a perforation rate of 25% -30% and a perforation aperture of 4-6 mm.

4. The multi-cavity, multi-stage, wide-frequency muffler of claim 1, wherein: the central lines of the secondary muffler cylinder (7) and the secondary muffler perforated pipe (8) are parallel to the central line of the primary muffler cylinder (1).

5. The multi-cavity, multi-stage, wide-frequency muffler of claim 1, wherein: 2-8 primary muffler perforated pipes (2) are supported on the muffler partition plate (3) in a penetrating manner.

6. The multi-cavity, multi-stage, wide-frequency muffler of claim 1, wherein: the perforation rate of the secondary muffler perforated pipe (8) is 25% -30%, and the perforation aperture is 4-8 mm.

7. The multi-cavity, multi-stage, wide-frequency muffler of claim 1, wherein: the secondary muffler cylinder (7) is fixedly connected to the primary muffler cylinder (1) through a connecting piece (11).

8. The multi-cavity, multi-stage, wide-frequency muffler of claim 1, wherein: the sound absorption material is rock wool or glass fiber, and glass fiber cloth is lined between the rock wool or the glass fiber and the secondary muffler perforated pipe (8).