JPH078806Y2 - Silencer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a silencer for reducing noise caused by discharge of compressed gas.

[Prior Art] Since air discharged after driving a pneumatic cylinder or the like directly emits great noise to the atmosphere, it is necessary to emit noise to the atmosphere through a silencer to reduce the noise.

Conventionally, as the silencer, for example, as shown in FIG. 3, a silencer in which an opening end of a silencer 2 formed in a cylindrical shape with a bottom is attached to a discharge port of a hollow attachment member 1 is known.

This muffler has the advantage that the air flow resistance is small, but since the muffling material 2 is not supported by the mounting member 1, the strength of the muffling material determines the pressure resistance of the muffler, and the exhaust pressure is high. The problem is that it cannot be used in some cases.

Further, as shown in FIG. 4, a cylindrical silencing material 6 is provided in a cylindrical case 5 having a plurality of exhaust ports 4, ... Put on,
A muffler is known in which the front end opening of the case 5 is closed by an end plate 7.

In this muffler, since the muffling material 6 is supported by the case 5, the muffler can be used even when the exhaust pressure is high. However, after mounting the muffling material 6 in the case 5, the end plate 7 is ultrasonically welded to the case. Since it is necessary to fix it to No. 5, there is a problem that the number of parts is increased, and it takes time to assemble each part after assembling each part, resulting in high cost.

[Problems to be Solved by the Invention] In the present invention, by fixing the case and the sound deadening material at the time of molding the case, the case molding and the sound deadening material can be performed at the same time to save the labor of assembling. At the same time, reducing the cost of the silencer by reducing the number of parts,
This is a problem to be solved.

[Means for Solving the Problems] A silencer of the present invention for achieving the above object is a case in which a plurality of exhaust ports and connection ports for pneumatic equipment are opened, and a silencer mounted in the case. In a silencer consisting of
The case is integrally formed of thermoplastic synthetic resin, and the sound deadening material is composed of a hollow bottomed powder sinter having fine ventilation holes, and the case has an exhaust port located around the sound deadening material. In addition, the connection port is made to communicate with the inside of the sound deadening material so as to surround the sound deadening material, and is integrally fixed to the sound deadening material.

[Operation] Since the case and the sound deadening material are integrally fixed together with the molding of the case, the number of manufacturing steps can be greatly reduced. Therefore, the cost of the silencer is reduced in combination with the decrease in the number of parts.

Further, since the sound deadening material is not only fixed to the case but also supported by the case, it can be used even when the exhaust pressure is high.

[Embodiment] FIG. 1 and FIG. 2 show an embodiment of the present invention.
The case 10 is composed of a case 11 and a sound deadening material 12 integrated with the case 11.

The case 11 has a connecting portion 13 connected to the exhaust port of a pneumatic device at one end, and a plurality of exhaust ports 14, ... It is formed by injection molding of synthetic resin.

On the other hand, the sound deadening material 12 is integrally molded into a bottomed tubular shape by sintering an appropriate metal or polyethylene powder, and has continuous fine ventilation holes formed therein. The particle size of the powder constituting the sound deadening material 12 is preferably 100 to 150 μm or less,
When the injection pressure of the case 11 is high, it is necessary to reduce the particle size in order to reduce the diameter of the ventilation hole.

In the above embodiment, the sound deadening material 12 is held in the molding die of the case 11 by appropriate means, and the molten thermoplastic synthetic resin is injected into the die to form the case 11 surrounding the sound deadening material 12. By doing so, the case 11 and the silencing material 12 are integrally fixed. In this case, since the sound deadening material 11 is formed by sintering the powder, it is hardly deformed even when the injection molding pressure is applied.

In the above embodiment, since the case 11 and the sound deadening material 12 are fixed by injection molding of the case 11 on the outer periphery of the sound deadening material 12, the sound deadening material is mounted in the molded case, or one end of the case is closed thereafter. Since it does not need to be performed, the number of manufacturing steps and the number of parts are reduced, which can reduce the cost of the silencer.

[Advantages of the Invention] In the present invention, since the case and the muffling material are fixed to each other by molding the case on the outer periphery of the muffling material, the number of manufacturing steps and the number of parts of the muffler are reduced, thereby reducing the cost of the muffler. be able to.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a vertical sectional view of the same as above, and FIGS. 3 and 4 are vertical sectional views of a conventional silencer. 11 …… case, 12 …… silencer, 15 …… exhaust port.

Claims (1)

[Scope of utility model registration request] 1. A muffler comprising a case having a plurality of exhaust ports and connection ports to pneumatic equipment and a muffling material mounted in the case, wherein the case is integrally formed of thermoplastic synthetic resin. Along with that, the sound deadening material is constituted by a hollow bottomed powder sinter having fine ventilation holes, and the case has the exhaust port located around the sound deadening material and the connection port communicating with the interior of the sound deadening material. The silencer is characterized in that the silencer is formed so as to surround the outer periphery of the silencer and is integrally fixed to the silencer.