JPS595135Y2 - Silencer - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a muffler installed in an engine or the like, and particularly relates to a muffler in which three or more muffler chambers are formed in series.

Traditionally, the interior of a silencer is divided into multiple silencing chambers, and high-temperature, high-pressure exhaust gas discharged from the exhaust pipe of an engine, etc. is sequentially guided to each silencing chamber, where it expands to muffle the sound. There is.

However, in this case, the vibrations of the internal components generated by the pulsation of the exhaust gas are easily transmitted to the outer wall of the muffler.
There was a problem in that the vibration of the silencer itself generated new noise.

Therefore, the present applicant previously proposed a muffler in which the rigidity of the internal components was increased by forming a spherical muffler chamber (Utility Model Publication No. 56-48892).

However, since the spherical silencing chamber is housed inside the muffler body, the volume of the silencing chamber is small, making it difficult to reduce the pressure of exhaust gas sufficiently. Since the exhaust gas inlet pipe and the exhaust gas outlet pipe from the spherical silencing chamber are arranged in an intersecting manner, there is a problem that the noise is emitted outside the silencing chamber before it is sufficiently damped by interference, and the silencing effect is not sufficient. Ta.

The present invention has been proposed in view of these points, and it is designed to reliably muffle the noise caused by exhaust gas, increase the rigidity of the internal components, and prevent pulsation from affecting the outer wall of the muffler. The present invention provides a small-sized muffler with good muffling effect.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a longitudinal sectional front view of a silencer. In the figure, the silencer 1 is constructed by making a pair of outer cylinders 2° 2 formed in the shape of a cylinder with a bottom, with the openings facing each other, and the peripheral edge 3 of the cylinder formed by curling. The internal space is divided into three silencing chambers 6, 7, and 8 by two shielding plates 4, 5.

The shielding plate 4 that partitions the first sound deadening chamber 6 at the highest level and the second sound deadening chamber 7 at the middle position is formed into an upwardly convex spherical shape, and a convex curved surface 9 is formed in the first sound deadening chamber 6 and a concave shape. The outer cylinders 2 are clamped and fixed between the curling joints of the outer cylinders 2, with the curved surface 10 facing the second silencing chamber 7.

On the other hand, the shielding plate 5 that partitions the second silencing chamber 7 and the third silencing chamber 8 at the lowest level is also formed in a downwardly convex spherical shape, and the concave curved surface 1
Spora I is welded to the inner circumferential surface 13 of the outer cylinder 2 with the protruding curved surface 12 facing the second silencing chamber 7 and the third silencing chamber 8.

The first silencing chamber 6 is configured as a double cylinder except for the protruding curved surface 9 portion of the shielding plate 4, and glass wool 15 is filled between the inner cylinder 14 made of a perforated plate and the inner circumferential surface 13 of the outer cylinder 2. has been done.

The exhaust inlet pipe 16 of the muffler 1 projects transversely into the upper space of the first muffling chamber 6, and the exhaust outlet 17 formed on the lower surface thereof faces the convexly curved surface 9 of the shielding plate 4. .

The second silencing chamber 7 has a spherical shape with two upper and lower shielding plates 4 and 5, and its lower space and the upper space of the first silencing chamber 6 are connected through a communicating pipe 18. The second silencing chamber side opening 18 a faces the concave curved surface 11 of the lower shielding plate 5 .

The upper space of the second silencing chamber 7 and the lower space of the third silencing chamber 8 are connected through a communicating pipe 19.
The second silencing chamber side opening 19a of 9 faces the concave curved surface 10 of the upper shielding plate 4 of the second silencing chamber 7.

The double-speed communication pipes 18, 19 are arranged in the second muffling chamber 8 in a substantially parallel alternating manner.

An exhaust outlet pipe 20 is led out from the third silencing chamber 8.

This exhaust outlet pipe 20 includes an outer cylinder 20a and an inner cylinder 20 made of a perforated plate.
It has a double-tube structure in which a heat-insulating sound absorbing material 20C, such as glass wool, is filled between the outer cylinder 20a and the outer cylinder 20a.

Next, the silencing effect of this muffler 1 will be explained.

The high-temperature, high-pressure exhaust gas flowing into the first silencing chamber 6 from the exhaust inlet pipe 16 passes through the glass wool 1 arranged on the inner circumferential wall of the silencing chamber 6.
5, but at this time, since the shielding plate 4 that partitions the first silencing chamber 6 and the second silencing chamber 7 protrudes spherically toward the first silencing chamber 6, the exhaust gas is blocked. It is diffusely reflected toward the peripheral side wall by the convexly curved surface 9 of the plate 4 and guided to the glass wool 15.

Next, the exhaust gas flows into the second silencing chamber 7 through the connecting pipe 18, but since the second silencing chamber 7 has a spherical shell shape with two shielding plates 4 and 5, the second silencing chamber 7 The noise caused by the exhaust gas flowing into the chamber 7 is muffled by reflective interference, flows into the third noise chamber 8 from the connecting pipe 19, expands in the third muffler chamber 8, lowers the pressure, and then passes through the exhaust outlet pipe 20. Glass wool placed on the inner surface 2
When it comes into contact with 0 C, the sound is further absorbed and emitted to the outside.

As described above, the present invention has a shielding plate that divides the interior of a cylindrical silencer into a plurality of soundproofing chambers in the form of a partially spherical shell, and the exhaust gas inlet pipe and exhaust outlet pipe are each formed on the concave curved surface of the shielding plate. Since the opening faces the silencing room, the noise in the silencing room interferes with each other through reflection from the wall surface, making it possible to significantly attenuate the noise.

In addition, since the inlet pipe and the outlet pipe are arranged almost parallel to each other in a staggered manner, the noise does not directly flow out, or it does not flow out of the silencing room before it is sufficiently damped by interference due to a small number of reflections. The noise reduction effect can be enhanced.

However, since the shielding plate is formed in the shape of a partially spherical shell, the rigidity of the shielding plate is high, making it difficult for vibrations caused by exhaust pulsation to be transmitted to the outer wall of the silencer body, and the vibrations of the silencer itself In addition to not generating new noise, it is possible to form a large-volume silencing chamber within the muffler, resulting in a large exhaust gas pressure drop and a large silencing ability.

For these reasons, according to the present invention, it is possible to obtain a small-sized muffler with good muffling effect.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional front view of the muffler, and FIG. 2 is a sectional view taken along the line II--II. 1... Silencer body, 4, 5... Shielding plate, 6, 7.8... Silence chamber, 18... Exhaust introduction pipe, 19 ...Exhaust outlet pipe.

Claims (1)

[Scope of utility model registration request] Three or more silencing chambers 6, 7.8 are formed in series within the muffler main body 1 by partitioning the inside of the cylindrical muffler main body 1 with a plurality of shielding plates 4.5, and each adjacent muffler The closing plates 4゜5 are formed into partial spherical shell shapes whose central parts move away from each other, and both closing plates 4.
, 5, an exhaust inlet pipe 18 and an outlet pipe 19 are connected to the intermediate silencing chamber 7 between the
are inserted from opposite shielding plates 4, 5 in a substantially parallel manner to each other in a staggered manner, and are opened to face the opposite shielding plates 5, 4.