JPH0240246Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a silencer that can be attached to the air intake or exhaust port of various air compressors or the like.

[Prior art and its problems]

Generally, a muffler is attached to the air intake or exhaust port of various air compressors in order to prevent noise caused by rapid air flow.

FIG. 2 shows a conventional muffler attached to the exhaust port of the air compressor, and reference numeral 1 in the figure indicates the main body.

The main body 1 has a generally cylindrical appearance with a space 2 formed therein, and a side plate 4 in the form of a disc that closes the space 2 is integrally formed at one end 3 of the main body 1 . One end of a connecting pipe 5 communicating with the space 2 in the main body 1 is inserted into the center of the side plate 4, and the other end of the connecting pipe 5 is an exhaust port of an air compressor (not shown). It is connected to the.

Further, on the outer periphery of the main body 1 near the other end 6, a large number of small-diameter exhaust holes (holes) 7 that penetrate the main body 1 in the radial direction and communicate with the space 2 are provided.
... are bored along the circumferential direction. On the other hand, a sound absorbing body 9 covered with a bag-shaped wire mesh 8 is inserted inside the main body 1. The sound absorbing body 9 is a cylindrical body integrally formed from a sound absorbing material such as rock wool or glass fiber, and its outer diameter is slightly smaller than the inner diameter of the main body 1. Further, a flow path 9a communicating with the connecting pipe is formed in the hollow portion of this sound absorbing body 9. A flange 10 is formed on the end 6 of the main body 1, and a disc-shaped lid (side plate) 11 that closes the end 6 side of the main body 1 is attached to the flange 10, and a bolt and nut are attached to the flange 10. It is attached by.

In the conventional silencer with the above configuration,
High-pressure air exhausted from an air compressor (not shown) is first guided to the flow path 9a of the sound absorber 9 via the connecting pipe 5. The high-pressure air guided to the flow path 9a passes through the sound absorber 9, and at this time, the sound is absorbed by the passage resistance within the sound absorber 9, and is released to the atmosphere from the exhaust holes 7. It is becoming more and more common.

However, in the case of the above conventional silencer,
Since the sound absorber 9 is formed into a cylindrical shape with a flow path 9a inside, it is not possible to ensure a sufficient length of passage of high-pressure air within the sound absorber 9, and thus a high sound absorption effect cannot be obtained. The drawback was that it was not possible. In addition, especially when used in an appliance that intermittently exhausts high-pressure air, such as an air compressor, the high-pressure air is directly passed through the flow path 9a to the cover body 1.
Since the lid body 1 collides with the end face of the lid body 1 in a pulsed manner,
1. There were also disadvantages in that the surface could be locally distorted or could be subject to oxidative corrosion due to moisture, sulfur, etc. contained in the high-pressure air.

[Purpose of invention]

This idea was made in view of the above circumstances,
It is an object of the present invention to provide a muffler which can obtain a high sound absorption effect and which does not cause local distortion or oxidation corrosion on the main body or side plates.

[Structure of the idea]

The muffler of this invention has a cylindrical body that is closed at one end and has an exhaust hole that opens on the outer circumferential surface of the one end, and a cylindrical body that is connected to the other end of the body to allow gas to flow inside the body. sound absorbing elements are arranged in layers in the radial direction of the main body inside one end side of the main body, and elements are arranged in layers in the axial direction of the main body inside the other end side of the main body,
These elements constitute a sound absorbing body that fills the inside of the main body.

〔Example〕

FIG. 1 shows an example of a silencer of this invention, and parts common to those shown in FIG. 2 are given the same reference numerals.

In FIG. 1, in this example of the silencer, the side plate 4
A sound absorbing body 20 is filled in a space 2 in the main body 1 which is sandwiched between the main body 1 and the lid body (side plate) 11. This sound absorbing body 20 includes a large number of elements 21 each made of rock wool, glass fiber, etc.
22, 23, . . . are formed into a cylindrical shape as a whole. That is, approximately half of the sound absorbing body 20 located on the side plate 4 side has a plurality of disc-shaped elements 21 (six in the figure) having an outer diameter slightly smaller than the inner diameter of the main body 1. )
It is formed by stacking layers. Also,
Approximately half of the sound absorbing body 20 located on the side of the lid (side plate) 11 has a cylindrical element 23 arranged around the outer periphery of a cylindrical element 22 arranged in the center.
It is formed by providing a plurality of layers (three layers in the figure).

However, in such a silencer, since the space 2 between the side plate 4 and the lid 11 is filled with the sound absorbing body 20 having a cylindrical shape as a whole, the connecting pipe 5
The passage length of the high-pressure air guided from the sound absorbing body 20 is extremely long, so that a high sound absorbing effect can be obtained. Moreover, even when used in an appliance that intermittently exhausts high-pressure air, such as an air compressor, the impact caused by the high-pressure air can be alleviated within the highly compressible sound absorbing body 20. 11 and the main body 1 will not be subject to local distortion or oxidation corrosion.

In this way, in the present application, the elements are arranged in a layered manner, and each element is arranged perpendicular to the streamline of the gas. This direction also intersects the network formed by the fibers of the elements, so there is strong resistance to the passage of gas, and each element absorbs sound energy equally. In addition, when filling the element, layers are stacked one on top of the other, and the packing density increases in the layer direction, which also increases the sound absorption effect.
It is possible to provide a small-sized muffler with a large muffling effect.

[Effect of idea]

As explained above, the muffler of this invention has a cylindrical body that is closed at one end and has an exhaust hole that opens on the outer peripheral surface of the one end, and a cylindrical body that is connected to the other end of the body. A connecting pipe for supplying gas is provided inside the main body, sound absorbing elements are arranged in layers in the radial direction of the main body inside one end of the main body, and elements are arranged inside the other end in the axial direction of the main body. Since these elements are arranged in layers and constitute a sound absorbing body that fills the inside of the main body, the fiber density of the elements is high, and gas can pass through in a direction that intersects the network formed by the element fibers. Therefore, the sound absorption effect is enhanced, and a small muffler with a large sound silencing effect can be provided. Moreover, since the sound absorber can be used as a buffer material, it is possible to prevent local distortion and oxidative corrosion caused by the impact of high-pressure air on the main body and side plates.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an embodiment of the muffler of this invention, and FIG. 2 is a side sectional view showing a conventional muffler. 1...Body, 2...Space, 3, 6...End, 5
... Connection pipe, 7 ... Exhaust hole (hole), 9, 20 ...
... Sound absorber, 11 ... Lid body (side plate), 21, 22,
23...Element.

Claims (1)

[Claims for Utility Model Registration] A cylindrical body that is closed at one end and has an exhaust hole that opens on the outer peripheral surface of this one end, and a cylindrical body that is connected to the other end of the body and has a A connecting pipe for supplying gas, sound absorbing elements are arranged in layers in the radial direction of the main body inside one end of the main body, and elements are arranged in layers in the axial direction of the main body inside the other end of the main body. A silencer characterized in that these elements constitute a sound absorbing body filling the inside of the main body.