JPH0649710U - Exhaust silencer for pneumatic equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] High sound deadening effect and ensuring high-speed operability of pneumatic equipment without exerting high exhaust back pressure on pneumatic equipment.
Further, to obtain an exhaust silencer having a simple structure and easy to manufacture. In an exhaust silencer 10 of a pneumatic device, an expansion chamber 21 having an exhaust inlet 22 communicating with an exhaust port of the pneumatic device, and an extension chamber 21 extending from the expansion chamber 21 to a side opposite to the exhaust inlet 22 A plurality of exhaust gas exhaust pipes 23 that are opened in the interior of the exhaust gas exhaust pipe 23, and a sound absorbing material filling chamber 24 that is provided around a large number of through holes 23A provided in the wall of each exhaust gas exhaust pipe 23.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an exhaust silencer for pneumatic equipment such as an air cylinder and an air motor.

[0002]

[Prior art]

 Conventionally, as an exhaust silencer for pneumatic equipment, there is one disclosed in Japanese Utility Model Publication No. 61-43904 or Japanese Utility Model Publication No. 3-488.

In Japanese Utility Model Publication No. 61-43904, a sound absorbing material filling chamber communicating with an exhaust port of an air cylinder is filled with a sound absorbing material, and the sound absorbing material filling chamber is opened to the outside.

In Japanese Utility Model Publication No. 3-488, a sound absorbing material is attached to the inner surface of an expansion chamber provided with an exhaust inlet communicating with the exhaust port of an air cylinder, and the anti-exhaust air of the expansion chamber is exhausted. One end of the exhaust chamber that closes the end face on the inlet side, receives the exhaust gas reflected by the closed end face and is redirected 180 degrees and discharges it to the outside, is connected to the side wall on the exhaust inlet side of the expansion chamber. In addition, a sound absorbing material is attached to the inner surface of the exhaust / exhaust pipe.

[0005]

[Problems to be solved by the device]

 However, the one described in Japanese Utility Model Publication No. 61-43904 has the following problems.

Since the entire cross section of the exhaust passage is filled with the sound absorbing material, the exhaust resistance becomes excessive. Therefore, a high back pressure acts on the air cylinder, which prevents high-speed operation.

The sound absorbing material is clogged by the drain in the exhaust, and the back pressure acting on the air cylinder is further increased. Therefore, the frequency of exchanging the sound absorbing material increases.

In addition, the one disclosed in Japanese Utility Model Publication No. 3-488 has the following problems. The exhaust gas is redirected 180 degrees inside the expansion chamber and reflected toward the exhaust gas inlet port that communicates with the air cylinder exhaust port. Therefore, the reflection component of the exhaust gas exerts a high back pressure on the air cylinder, which prevents high-speed operation.

The sound absorbing material is not only attached to the expansion chamber and each inner surface of a single exhaust / exhaust pipe, but also the sound absorbing material has a small loading volume and the chance of contact between the exhaust and the sound absorbing material is small. Therefore, the sound absorbing effect of the sound absorbing material is small.

The sound absorbing material is attached to the expansion chamber and each inner surface of the single exhaust / exhaust pipe, and the attachment workability and the replacement workability are extremely poor, and it is difficult to manufacture.

The present invention provides an exhaust silencer that has a high sound deadening effect, ensures high-speed operability of pneumatic equipment without exerting high exhaust back pressure on the pneumatic equipment, and has a simple structure and is easy to manufacture. The porpose is to do.

[0012]

[Means for Solving the Problems]

 The present invention relates to an exhaust silencer for a pneumatic device that is connected to the exhaust port of the pneumatic device. An expansion chamber having an exhaust inlet communicating with the exhaust port of the pneumatic device and an exhaust inlet of the expansion chamber. A plurality of exhaust gas exhaust pipes that are arranged in parallel so as to open at a plurality of positions on the other end surface opposite to the one end surface that is provided and extend toward the side opposite the exhaust gas exhaust port and open to the outside, and provided around each exhaust gas exhaust pipe. A sound absorbing material filling chamber that is filled with a sound absorbing material is provided so as to communicate with the inside of the exhaust discharging pipe through a large number of through holes formed through the pipe wall of each exhaust discharging pipe. It was done.

[0013]

[Action]

 According to the present invention, the following effects are obtained.

Exhaust gas is “expanded and decompressed” in the expansion chamber and silenced, and then is muffled as a “slow and undisturbed flow” through a plurality of exhaust gas exhaust pipes arranged in parallel. The sound-absorbing material around the pipe “absorbs” the sound and silences it, giving it a high silencing effect.

In the above description, the sound absorbing material is filled in the sound absorbing material filling chamber provided around the plurality of exhaust gas exhaust pipes arranged in parallel, the sound absorbing material has a large loading volume, and the exhaust gas and the sound absorbing material are separated from each other. There are also many opportunities for contact. Therefore, the sound absorbing material has a great sound deadening effect.

Exhaust gas is discharged to the outside through the expansion chamber from a plurality of exhaust gas exhaust pipes arranged in parallel as a low-speed, undisturbed flow. Therefore, high back pressure of exhaust gas is not applied to the pneumatic equipment, and high-speed operability of the pneumatic equipment can be secured.

The sound absorbing material is filled in the sound absorbing material filling chamber, has good filling workability and replacement workability, and is easy to manufacture.

The drain in the exhaust gas can be captured in the expansion chamber that does not come into contact with the sound absorbing material, the clogging of the sound absorbing material can be prevented, and the replacement frequency can be reduced.

[0019]

【Example】

 FIG. 1 is a schematic diagram showing an embodiment of the present invention, and FIG. 2 is a schematic diagram showing an application example of the present invention.

The exhaust silencer 10 has a silencer case 15 including an outer cylinder 11, end plates 12 and 13, and a partition plate 14. The outer cylinder 11 and the end plate 13 have a structure that can be attached and detached by screw fastening or the like.

In the exhaust silencer 10, the portion of the silencer case 15 that is partitioned by the outer cylinder 11, the end plate 12, and the partition plate 14 is used as an expansion chamber 21, and the end plate 12 that partitions the expansion chamber 21. An exhaust introduction port 22 communicating with the exhaust port of the pneumatic equipment is provided at the center. 22A is an exhaust introduction pipe.

Further, the exhaust silencer 10 has four exhaust discharge pipes 23 that are open at a plurality of positions of the partition plate 14 facing the end plate 12 where the exhaust introduction port 22 of the expansion chamber 21 is provided. . The exhaust gas discharge pipes 23 are arranged in parallel so as to extend from the partition plate 14 side to the end plate 13 in the outer cylinder 11 in the direction opposite to the exhaust gas introduction port 22 and open to the outside. The exhaust discharge pipe 23 is made of hunting metal or the like, and has a large number of through holes 23A formed through the pipe wall.

In addition, the exhaust silencer 10 is a portion of the case 15 that is divided by the outer cylinder 11, the end plate 13, and the partition plate 14, and forms a sound absorbing material filling chamber 24 around each exhaust discharge pipe 23. . The sound absorbing material filling chamber 24 is filled with the sound absorbing material 25 by communicating with the inside of the exhaust / exhaust pipe 23 through a large number of through holes 23A formed through the pipe wall of each exhaust / exhaust pipe 23. As the sound absorbing material 25, for example, glass wool is used.

In the exhaust silencer 10, the expansion chamber 21 is configured to have an inner diameter of 5 times or more and a length of 3 times or more of the exhaust introducing pipe 22A.

Further, the exhaust introduction pipe 22A has a diameter equal to or larger than that of an exhaust port such as a solenoid valve on the pneumatic equipment side, and is threaded so as to be connected to the exhaust port.

Further, three to four exhaust discharge pipes 23 are provided on the same pitch circle, and the total cross-sectional area of all the exhaust discharge pipes 23 is configured to be three times or more the cross-sectional area of the exhaust introduction pipe 22A. ing. The exhaust gas exhaust pipe 23 is configured to have a length of 5 times or more the diameter of the exhaust gas introduction pipe 22A. The open area ratio of the through hole 23A of the exhaust gas exhaust pipe 23 is about 50%, and the exhaust gas exhaust pipe 23 may be made of not only metal but also resin.

In the exhaust silencer 10, a drain cock 26 that communicates with the bottom surface of the expansion chamber 21 is provided in the lower portion of the outer cylinder 11 so that the drain in the exhaust can be discharged.

The operation of this embodiment will be described below.

The exhaust gas is “expanded and depressurized” in the expansion chamber 21 to be muffled, and then is muffled as a “slow and undisturbed flow” through a plurality of exhaust gas exhaust pipes 23 arranged in parallel. The sound absorbing material 25 around the exhaust gas exhaust pipe 23 "sounds" to mute the sound, and a high sound deadening effect is imparted.

In the above description, the sound absorbing material 25 is filled in the sound absorbing material filling chamber 24 provided around the plurality of exhaust gas exhaust pipes 23 arranged in parallel, the sound absorbing material 25 has a large loading volume, and exhaust and sound absorbing There are also many opportunities for contact with the material 25. Therefore, the sound absorbing material 25 has a great sound deadening effect.

Exhaust gas is discharged to the outside through the expansion chamber 21 from a plurality of exhaust gas exhaust pipes 23 arranged in parallel at a low speed without disturbance. Therefore, high back pressure of exhaust gas is not applied to the pneumatic equipment, and high-speed operability of the pneumatic equipment can be secured.

The sound absorbing material 25 is filled in the sound absorbing material filling chamber 24, and since the end plate 13 can be attached and detached, the filling workability and the replacement workability are good, and the manufacturing is easy.

The drain in the exhaust gas can be captured in the expansion chamber 21 that does not touch the sound absorbing material 25, the clogging of the sound absorbing material 25 can be prevented, and the replacement frequency can be reduced.

FIG. 2 is an example in which the above-described exhaust silencer 10 is applied to the exhaust system of a bar support air cylinder that supports a bar of a thrust block truck installed in a reeler mill of a seamless steel pipe manufacturing line. . In FIG. 2, 31 is a thrust block carriage, 32 is a bar, 33 is a bar support, 34 is an air cylinder, and 35 is a solenoid valve. Since the moving speed of the carriage 31 is 5 m / sec, the air cylinder 34 needs to operate the bar support 33 at high speed.

Regarding the exhaust noise of the exhaust system of the air cylinder 34, the noise level when the silencer 10 is removed is 120 dB (A), whereas the noise level when the silencer 10 is applied is 87 dB (A). , A large noise reduction effect of 33 dB (A) was recognized.

Further, the extension (delay) of the operating time of the air cylinder 34 due to the application of the muffler 10 is only about 3/100 seconds longer than when the muffler 10 is removed. It has been confirmed that the back pressure exerted on the cylinder 34 is extremely small and does not impair the high speed operability of the air cylinder 34.

[0037]

[Effect of device]

 As described above, according to the present invention, an exhaust silencer which has a high sound deadening effect, ensures high-speed operability of pneumatic equipment without exerting a high exhaust back pressure on the pneumatic equipment, and has a simple structure and is easy to manufacture. Can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIG. 2 is a schematic view showing an application example of the present invention.

[Explanation of symbols]

 10 Exhaust Muffler 21 Expansion Chamber 22 Exhaust Inlet 23 Exhaust Discharge Pipe 23A Through Hole 24 Sound Absorbing Material Filling Chamber 25 Sound Absorbing Material

Claims (1)

[Scope of utility model registration request] 1. An exhaust silencer for a pneumatic device, which is connected to an exhaust port of the pneumatic device, wherein the expansion chamber includes an exhaust inlet communicating with the exhaust port of the pneumatic device, and an exhaust inlet of the expansion chamber. A plurality of exhaust discharge pipes that are arranged in parallel so as to open to a plurality of positions on the other end face opposite to the one end face and extend toward the side opposite to the exhaust introduction port and open to the outside. A sound absorbing material filling chamber, which is provided and communicates with the inside of the exhaust discharge pipe through a large number of through holes formed through the pipe wall of each exhaust discharge pipe and is filled with a sound absorbing material. Exhaust silencer for pneumatic equipment.