CN217177878U

CN217177878U - Pneumatic silencer

Info

Publication number: CN217177878U
Application number: CN202220554698.1U
Authority: CN
Inventors: 刘小平; 白新宽; 王明; 芮波; 赵喜爱; 于明航; 刘庆伟; 霍子阳
Original assignee: Shendong Coal Branch of China Shenhua Energy Co Ltd; Guoneng Shendong Coal Group Co Ltd
Current assignee: Shendong Coal Branch of China Shenhua Energy Co Ltd; Guoneng Shendong Coal Group Co Ltd
Priority date: 2022-03-14
Filing date: 2022-03-14
Publication date: 2022-08-12
Anticipated expiration: 2032-03-14

Abstract

The utility model discloses a pneumatic muffler, include: first order sound-absorbing structure and second grade sound-absorbing structure, first order sound-absorbing structure includes that one-level muffler shell and holding inhale the sound device in one-level muffler shell, second grade sound-absorbing structure includes that second grade muffler shell and holding are at the silencing device of second grade muffler shell, one-level muffler shell one end is one-level muffler air inlet joint, the other end of one-level muffler shell is one-level muffler air outlet joint, one-level muffler air outlet joint communicates with second grade muffler shell, be provided with the exhaust hole on the casing of second grade muffler shell. The utility model discloses set up two-stage sound-absorbing structure, gaseous when first order sound-absorbing structure, by inhaling the sound device and inhaling the sound, with partial energy absorption, reduce the velocity of flow, then when second order sound-absorbing structure, by the further noise reduction of silencing device. And good noise reduction effect is realized through two-stage noise reduction.

Description

Pneumatic silencer

Technical Field

The utility model relates to a colliery correlation technique field, especially a pneumatic muffler.

Background

In the coal mine driving face, pneumatic equipment such as a pneumatic anchor rod machine and the like is mainly used in the supporting process under the common condition. Due to the structural characteristics of the pneumatic equipment, the noise is high. The pneumatic equipment is operated manually for a long time, and occupational hazards caused by noise are increased.

Therefore, how to reduce the noise hazard brought by pneumatic equipment is a technical problem which is difficult to solve in the field for a long time.

For this reason, existing pneumatic bolters provide a silencer, however, the noise reduction effect of the existing pneumatic bolters is not good.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a pneumatic muffler for solving the technical problem of poor noise reduction effect of the prior art muffler.

The utility model provides a pneumatic muffler, include: first order sound-deadening structure and second grade sound-deadening structure, first order sound-deadening structure includes that one-level muffler shell and holding are in sound device of inhaling in the one-level muffler shell, second grade sound-deadening structure includes that second grade muffler shell and holding are in silencing device in the second grade muffler shell, one-level muffler shell one end is one-level muffler air inlet joint, the other end of one-level muffler shell is one-level muffler air outlet joint, one-level muffler air outlet joint with second grade muffler shell intercommunication, be provided with the exhaust hole on the casing of second grade muffler shell.

Further, the sound absorbing means comprises sound absorbing cotton housed within the primary muffler shell.

Still further, the sound absorbing device further comprises a mesh pipe accommodated in the primary silencer casing, and the sound absorbing cotton wraps the mesh pipe.

Furthermore, a plurality of small holes are uniformly arranged on the pipe wall of the mesh pipe.

Further, the muffler device includes a muffler cotton housed within the secondary muffler shell.

Furthermore, the silencer also comprises an inner pipe accommodated in the second-stage silencer shell, the part of the inner pipe extends out of the second-stage silencer shell, the silencing cotton wraps the part of the inner pipe located in the second-stage silencer shell, and the inner pipe is communicated with the air outlet joint of the first-stage silencer.

Still further, a plurality of apertures are evenly arranged on the pipe wall of the inner pipe.

Furthermore, second grade muffler shell orientation the direction opening of one-level muffler shell, second grade sound-absorbing structure still includes the end cover, be equipped with the end cover through-hole in the middle of the end cover, the part that the inner tube stretches out second grade muffler shell passes behind the end cover through-hole, the end cover lid is tight second grade muffler shell opening.

And the second-stage silencing structure further comprises a nut, the inner pipe extends out of the outer pipe wall of the shell part of the second-stage silencer and is provided with threads, and the nut is in threaded connection with the outer pipe wall of the inner pipe and tightly supports the end cover.

Still further, still include the ferrule, the ferrule cramps the inner tube with the one-level silencer air outlet joint.

The utility model discloses set up two-stage sound-absorbing structure, gaseous when first order sound-absorbing structure, by inhaling the sound device and inhaling the sound, with partial energy absorption, reduce the velocity of flow, then when second order sound-absorbing structure, by the further noise reduction of silencing device. And good noise reduction effect is realized through two-stage noise reduction.

Drawings

Fig. 1 is a schematic structural diagram of the pneumatic silencer of the present invention.

1-a first stage of a sound attenuating structure; 11-a primary muffler shell; 12-a first-stage silencer air inlet joint; 13-first order silencer air outlet joint; 2-a second stage of a sound attenuating structure; 21-a secondary muffler shell; 22-an end cap; 23-a nut; 3-sound absorbing cotton; 4-mesh tube; 5-noise reduction cotton; 6-inner tube; 7-pipe hoop.

Detailed Description

The following describes the present invention with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that as used in the following description, the terms "front," "back," "left," "right," "upper" and "lower" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

Example one

Fig. 1 shows a schematic structural diagram of a pneumatic muffler of the present invention, which includes: first order silencing structure 1 and second level silencing structure 2, first order silencing structure 1 includes that one-level muffler shell 11 and holding are in sound absorbing device in the one-level muffler shell 11, second level silencing structure 2 includes that second level muffler shell 21 and holding are in silencing device in the second

level muffler shell

21, 11 one ends of one-level muffler shell are one-level muffler air inlet joint 12, the other end of one-level muffler shell 11 is one-level muffler air outlet joint 13, one-level muffler air outlet joint 13 with second level muffler shell 21 intercommunication, be provided with the exhaust hole on the casing of second level muffler shell 21.

Specifically, the primary muffler inlet fitting 12 is connected to the equipment that requires sound attenuation, such as a pneumatic bolter. High-speed gas generated by the equipment enters from the air inlet joint 12 of the primary silencer, and the sound absorption device absorbs part of energy, reduces the flow speed and reduces the noise. The air current is discharged from first order muffler air outlet joint 13 and is got into second grade muffler shell 21 in, and the air current is discharged from the exhaust hole of second grade muffler shell 21 after silencing device, further noise reduction. The exhaust holes may be provided in the wall of the secondary muffler shell 21. And a good noise reduction effect is realized through two-stage noise reduction.

The utility model discloses set up two-stage sound-absorbing structure, gaseous when first order sound-absorbing structure, by inhaling the sound device and inhaling the sound, with partial energy absorption, reduce the velocity of flow, then when second order sound-absorbing structure, by the further noise reduction of silencing device. And a good noise reduction effect is realized through two-stage noise reduction.

Example two

As shown in the drawings, the present invention provides a pneumatic silencer, including: the pipe hoop 7 is arranged on the second-stage silencing structure 2 of the first-stage silencing structure 1, the first-stage silencing structure 1 comprises a first-stage silencer shell 11 and a sound absorbing device accommodated in the first-stage silencer shell 11, the second-stage silencing structure 2 comprises a second-stage silencer shell 21 and a silencing device accommodated in the second-stage silencer shell 21, one end of the first-stage silencer shell 11 is a first-stage silencer air inlet joint 12, the other end of the first-stage silencer shell 11 is a first-stage silencer air outlet joint 13, the first-stage silencer air outlet joint 13 is communicated with the second-stage silencer shell 21, and an exhaust hole is formed in the shell of the second-stage silencer shell 21;

the sound absorption device comprises sound absorption cotton 3 accommodated in the primary silencer shell 11 and a mesh pipe 4 accommodated in the primary silencer shell 11, the sound absorption cotton 3 wraps the mesh pipe 4, and a plurality of small holes are uniformly formed in the pipe wall of the mesh pipe 4;

the silencer comprises silencing cotton 5 accommodated in the secondary silencer shell 21 and an inner pipe 6 accommodated in the secondary silencer shell 21, wherein part of the inner pipe 6 extends out of the secondary silencer shell 21, the silencing cotton 5 wraps the part, located in the secondary silencer shell 21, of the inner pipe 6, the inner pipe 6 is communicated with the primary silencer air outlet joint 13, and a plurality of small holes are uniformly formed in the pipe wall of the inner pipe 6;

second grade muffler shell 21 orientation the direction opening of one-level muffler shell 11, second grade sound-absorbing structure 2 still includes end cover 22 and nut 23, be equipped with the end cover through-hole in the middle of the end cover 22, inner tube 6 stretches out the part of second grade muffler shell 21 passes behind the end cover through-hole, end cover 22 covers tightly second grade muffler shell 21 opening, inner tube 6 stretches out the outer pipe wall of second grade muffler shell 21 part is equipped with the screw thread, nut 23 with outer pipe wall threaded connection of inner tube 6 and top tightly end cover 22, ferrule 7 cramps inner tube 6 with one-level muffler air outlet connector 13.

Specifically, the silencer of the present embodiment is a compound pneumatic silencer, and is divided into two stages of silencing structures. First order sound-deadening structure 1 includes one-level muffler shell 11, inhales the sound cotton 3,

mesh pipe

4, and 11 one end of one-level muffler shell are connected with one-level muffler air inlet joint 12, and the other end is connected with one-level muffler joint 13 of giving vent to anger. The mesh pipe 4 is characterized in that a plurality of small holes are uniformly distributed on the wall of a circular pipe, sound-absorbing cotton 3 is wrapped outside the small holes, and the sound-absorbing cotton 3 is wrapped by a first-stage silencer shell 11. Second stage noise cancelling structure 2 includes second stage muffler shell 21, end cover 22, amortization cotton 5, inner tube 6 and nut 23. The inner pipe 6 is inserted into the secondary muffler outer shell 21 and partially protrudes out of the secondary muffler outer shell 21. The silencing cotton 5 wraps the portion of the inner pipe 6 inside the secondary silencer casing 21. Second grade muffler shell 21 is towards the direction opening of one-level muffler shell 11, be equipped with the end cover through-hole in the middle of the end cover 22, the part that inner tube 6 stretches out second grade muffler shell 21 passes the end cover through-hole, end cover 22 covers tight second grade muffler shell 21 opening, the outer pipe wall that inner tube 6 stretches out second grade muffler shell 21 part is equipped with the screw thread, nut 23 and the outer pipe wall threaded connection of inner tube 6 and top tight end cover 22, the outer pipe wall of one-level muffler air outlet joint 13 also is equipped with the screw thread, pipe hoop 7 respectively with inner tube 6 and one-level muffler air outlet joint 13 threaded connection, thereby cramp inner tube 6 and one-level muffler air outlet joint 13. The primary muffler inlet fitting 12 and the primary muffler outlet fitting 13 may be tubular fittings. The outer pipe wall of the primary muffler inlet fitting 12 may be threaded for threaded connection with the equipment to be muffled.

When high-speed airflow flows through, the airflow enters the first-stage silencing structure 1, the airflow vibrates with the circular pipe wall of the mesh pipe 4, the sound-absorbing cotton 3 absorbs part of energy at the moment, the flow speed is reduced, and the noise can be reduced by 15-18 decibels. The gas stream then exits the primary muffler outlet fitting 13 and enters the secondary muffler structure 2. A plurality of small holes are uniformly distributed on the inner pipe 6, and the air flow flows into the silencing cotton 5 through the small holes. The silencing cotton 5 is a sound absorption material with good comprehensive performance, and has good air permeability while keeping a high noise reduction coefficient. After passing through the silencing cotton 5, the airflow is exhausted through the exhaust holes on the shell 21 of the secondary silencer, so that the noise can be reduced by 10-12 decibels. The noise can be reduced by 25-30 decibels through two-stage silencing.

As an example, the pneumatic silencer of the present embodiment is selectively disposed on the pneumatic bolting machine, and the specific implementation process is as follows:

the method comprises the following steps: removing the original silencer of the pneumatic anchor rod machine;

step two: changing the connection mode of the silencer;

step three: the pneumatic silencer of the embodiment is connected to the pneumatic bolting machine through threads;

the use effect is as follows: the pneumatic silencer of the embodiment can reduce the noise by 25-30 decibels when applied to a pneumatic anchor rod machine.

This embodiment is through two-stage amortization structure, makes the gas flow rate reduce through specific sound absorbing device, through specific silencing device structure noise reduction, realizes good noise reduction effect, can reduce workman's noise occupational hazard.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A pneumatic silencer, comprising: first order sound-deadening structure (1) and second level sound-deadening structure (2), first order sound-deadening structure (1) includes one-level muffler shell (11) and holding is in sound absorbing device in one-level muffler shell (11), second level sound-deadening structure (2) are in including second grade muffler shell (21) and holding silencing device in second grade muffler shell (21), one-level muffler shell (11) one end is one-level muffler air-inlet joint (12), the other end of one-level muffler shell (11) is one-level muffler air-outlet joint (13), one-level muffler air-outlet joint (13) with second grade muffler shell (21) intercommunication, be provided with the exhaust hole on the casing of second grade muffler shell (21).

2. Pneumatic silencer according to claim 1, characterized in that the sound-absorbing means comprise a sound-absorbing cotton (3) housed inside the primary silencer casing (11).

3. Pneumatic silencer according to claim 2, characterized in that said sound-absorbing means further comprise a mesh tube (4) housed inside said primary silencer casing (11), said sound-absorbing wool (3) wrapping said mesh tube (4).

4. Pneumatic silencer according to claim 3, characterized in that the walls of the mesh tubes (4) are evenly provided with a plurality of small holes.

5. The pneumatic silencer according to claim 1, characterized in that the silencing means comprise a silencing cotton (5) housed inside the secondary silencer casing (21).

6. The pneumatic silencer of claim 5, further comprising an inner pipe (6) housed within the secondary silencer casing (21), wherein the inner pipe (6) partially protrudes from the secondary silencer casing (21), wherein the silencing cotton (5) wraps a portion of the inner pipe (6) within the secondary silencer casing (21), and wherein the inner pipe (6) is in communication with the primary silencer air outlet joint (13).

7. Pneumatic silencer according to claim 6, characterized in that the inner pipe (6) has a plurality of small holes evenly arranged in its wall.

8. The pneumatic silencer of claim 6, wherein the secondary silencer casing (21) is open toward the primary silencer casing (11), the secondary silencing structure (2) further comprises an end cover (22), an end cover through hole is formed in the middle of the end cover (22), and after the part of the inner pipe (6) extending out of the secondary silencer casing (21) passes through the end cover through hole, the end cover (22) covers the opening of the secondary silencer casing (21).

9. The pneumatic silencer of claim 8, wherein the second stage silencing structure (2) further comprises a nut (23), the outer pipe wall of the inner pipe (6) extending out of the second stage silencer casing (21) is provided with threads, and the nut (23) is in threaded connection with the outer pipe wall of the inner pipe (6) and abuts against the end cover (22).

10. The pneumatic silencer of claim 6, further comprising a pipe clamp (7), wherein the pipe clamp (7) clamps the inner pipe (6) and the primary silencer outlet joint (13).