JP2002364356A - Exhaust muffler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust muffler capable of preventing the deformation of a muffler body by reducing thermal stress in a plug welding part between the muffler body and a partition plate. SOLUTION: This exhaust muffler 1 mounted on a motor consists of the partition plates 8, 9 partitioning the inside thereof into a plurality of chambers 5 to 7 and welding flanges 8a, 9a formed on one side of an outer peripheral part on an inner wall of the muffler body 2 and auxiliary plates 16, 17 which form an L-shape substantially, whose one side faces 16a, 17a are welded on a face 8b on the opposite side to the flanges 8a, 9a of the partition plates 8, 9, and whose other side faces 16b, 17b are welded to an inner wall of the muffler body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler mounted on a prime mover, and more particularly to an exhaust muffler configured to reduce a stress generated at a weld between a muffler body and a partition plate.

[0002]

2. Description of the Related Art High-temperature exhaust gas flowing at high pressure in an exhaust pipe of a prime mover (hereinafter referred to as "engine") is silenced by passing through an exhaust muffler. FIG.
An example of an exhaust muffler is shown. In an exhaust muffler 30, both ends of a square muffler body (outer drum) 31 are sealed by end plates (end plates) 32 and 33, and the inside of the exhaust muffler 30 is separated by partition plates (separators) 34 and 35. Expansion chamber 36-3
8, the high-temperature and high-pressure exhaust gas input from the inlet pipe 40 is supplied to these expansion chambers 36 to 36.
The sound is reduced by the sound absorbing material 39 and discharged to the atmosphere from the outlet pipe 41 at the same time.

[0003] The end plates 32, 33 are respectively bent to one side (outside) over the entire circumference to form flanges 32a, 33a, and these flanges 32a, 33a are connected to the muffler body 3 respectively.
1 and is welded over the entire circumference to seal the muffler body 31 tightly. Since the partition plates 34 and 35 have a structure fitted into the muffler body 31, they cannot have a welding structure like the end plates 32 and 33, and plug welding is generally employed. That is, the partition plates 34, 35 are formed such that the outer periphery of the peripheral portion is bent to one side over the entire periphery, and the flanges 34a, 35a
Is formed on the muffler body 31, and the flanges 34a, 3a
A portion 34b to be welded of the upper and lower, left and right straight portions of 5a,
Small holes (not shown) are formed at positions corresponding to 35b, and flanges 34a, 3
5 a is welded to the inner wall of the muffler body 31.

[0004]

The above-mentioned partition plate 34,
In the exhaust muffler having a structure in which the connection between the muffler body 35 and the muffler body 31 is welded by plug welding, a partition plate 34 inside the muffler body 31 that is in contact with the atmosphere at the time of heat load exposed to high-temperature exhaust gas. Since the temperature of the partition plate 35 is much higher than that of the partition plate 34, the bending deformation of the partition plates 34 and 35 is large, and there is a problem that a thermal stress is generated at a plug welding portion with the muffler body 31 and the muffler body 31 is deformed.

[0005] Therefore, an object of the present invention is to provide an exhaust muffler in which the thermal stress in the plug welding portion between the muffler body and the partition plate is reduced to prevent deformation of the muffler body.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a flange formed on an outer peripheral portion of a partition plate and one side surface of a reinforcing plate having an L-shaped cross section are opposite to each other. It is welded to the peripheral edge of the flange side, and the flange of the partition plate and the reinforcing plate are welded to the inner wall of the muffler body by plug welding. As a result, the flange and the reinforcing plate are paired in parallel and share the thermal stress generated in the plug welding part of the partition plate when exposed to high-temperature exhaust gas without changing the welding range (length). In addition, thermal stress applied to the muffler body is reduced, and deformation of the muffler body is prevented.

According to the second aspect of the present invention, the reinforcing plate is intermittently welded to the partition plate to prevent thermal deformation at the time of welding, to deform the partition plate due to thermal expansion at the time of heat load, and to cause a muffler body caused by this. To prevent deformation. Further, by adding a reinforcing plate having an L-shaped cross section to the partition plate, an increase in weight is suppressed and the rigidity of the partition plate is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be illustratively described in detail below with reference to the drawings. (First Embodiment) FIG. 1 is a partially cutaway perspective view of a first embodiment of an exhaust muffler according to the present invention, and FIG. 2 is a perspective view showing a relationship between a partition plate and an auxiliary plate shown in FIG. It is. As shown in FIG. 1, the exhaust muffler 1 has a rectangular muffler body 2 having a rectangular shape that is long vertically in an end view and a rounded corner portion, an end plate (end plate) 3 attached to both ends of the muffler body 2, 4, a plurality of expansion chambers 5, 6, inside the muffler body 2;
7, partition plates (separators) 8 and 9, exhaust gas inlet pipes 10 and outlet pipes 11, intermediate pipes 12 and 13 communicating with the expansion chamber, support rods 14, detent rods 15, and the like. . The partition plates 8 and 9 are provided with reinforcing plates 16 and 17.

The inlet pipe 10 and the outlet pipe 11 have one ends projecting from the end plate 3 and open, and the other ends are welded and fixed through the partition plates 8 and 9, respectively, and open to the expansion chamber 7. The intermediate pipes 12, 13 are welded and fixed through the partition plates 8, 9, and have one end open to the expansion chamber 5 and the other end open to the expansion chamber 7. On the wall surfaces of the inlet pipe 10, the outlet pipe 11, and the intermediate pipes 12, 13, a number of small holes (not shown) that open to the respective expansion chambers 5 to 7 are formed. Support rod 1
4 is welded and fixed through the end plate 3, the partition plates 8, 9 and the end plate 4, and the rotation preventing rod 15 is welded and fixed to the end plate 3.

The end plates 3 and 4 have flanges 3a and 4a formed by bending the outer periphery of the peripheral portion outward over the entire circumference.
It is a weld with the open end of the muffler body 2. The partition plate 8 has a flange 8 a formed by bending the outer periphery of the peripheral portion to one side over the entire periphery, and serves as a welded portion to the inner wall of the muffler body 2. As shown in FIG. 2, the partition plate 8 is provided with reinforcing plates 16 at straight portions at upper and lower and left and right side edges of a surface 8 b opposite to the flange 8 a. The reinforcing plate 16 has an L-shaped cross section, and the length thereof is the same as the length of the straight portion as each of the upper, lower, left and right welds of the flange 8a. The reinforcing plate 16 has one side surface 16a abutting on the end surface 8b, the other side surface 16b being flush with the outer surface of the flange 8a, and a peripheral edge portion welded to the end surface 8b by intermittent fillet welding 18. As a result, the partition plate 8 has a shape in which a flange 8a is provided on one side and a reinforcing plate 16 is provided on the other side as a welded portion with the muffler body 2. The partition plate 9 has a reinforcing plate 17 welded in the same manner as the partition plate 8.

The partition plates 8 and 9 are inserted into and housed in the muffler body 2, and the flange 8a of the partition plate 8 and the reinforcing plate 16,
The flange 9a and the reinforcing plate 17 of the partition plate 9 abut on the inner wall of the muffler body 2, respectively. The flanges 3 a, 4 a of the end plates 3, 4 are fitted inside the open ends of the muffler body 2.
The flanges 8a, the reinforcing plates 16, the flanges 9a, and the reinforcing plates 17 of the partition plates 8, 9 are plug-welded to the inner wall of the muffler body 2, respectively. In this plug welding, the welding positions of the flange 8a and the reinforcing plate 16 and the welding positions of the flange 9a and the reinforcing plate 17 are shown in FIG.
As shown by 9c and 17c, they may be arranged side by side, or the welding positions 8c and 16c may be arranged in a staggered manner by shifting 9c and 17c. The end plates 3 and 4 have the flanges 3a and 4a welded to the open end of the muffler body 2 over the entire circumference.

As described above, the reinforcing plates 16 and 17 are provided on the upper and lower, right and left plug welding portions of the partition plates 8 and 9 so that
, The thermal stress generated in the plug welds of the partition plates 8 and 9 by being exposed to the high-temperature exhaust gas, the flange 8a and the reinforcing plate 16, and the flange 9a and the reinforcing plate 17 are each paired in parallel. Muffler torso 2
Is reduced. The peripheral edges of the reinforcing plates 16 and 17 are welded to the partition plates 8 and 9 by intermittent welding 18 to prevent thermal deformation at the time of welding and to be integrated with the partition plates 8 and 9 to reinforce the partition plates 8 and 9 under heat load. The thermal expansion of the plate 16, the partition plate 9 and the reinforcing plate 17 can be made almost the same, and the deformation due to the thermal expansion of these partition plates 8 and 9 and the deformation of the muffler body 2 caused by this can be prevented. Can be. Further, by adding reinforcing plates 16 and 17 having an L-shaped cross section to the partition plates 8 and 9, an increase in weight is suppressed and the rigidity of the partition plates 8 and 9 is greatly improved.

(Second Embodiment) FIG. 3 is a partially cutaway front view showing an exhaust muffler according to a second embodiment of the present invention. The exhaust muffler 20 according to the second embodiment includes flanges 8 at the long left and right side edges of the welding portion of the partition plates 8 and 9.
a, 9a, reinforcement plates 16, 17
Is provided. Other configurations are the same as in the first embodiment.

[0014]

As described above, according to the first aspect of the present invention, the thermal stress at the plug welding portion between the muffler body and the partition plate is reduced, and the deformation of the muffler body is effectively prevented.
In addition, only by adding a reinforcing plate to the partition plate, an increase in weight is suppressed, and the rigidity of the partition plate is improved.

According to the second aspect of the present invention, the peripheral edge of one side of the reinforcing plate is intermittently welded to the partition plate to prevent thermal deformation at the time of welding and to be integrally formed, so that the thermal expansion of the partition plate at the time of heat load is achieved. Can prevent deformation of the muffler body.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a first embodiment of an exhaust muffler according to the present invention.

FIG. 2 is an assembled perspective view of a partition plate and a reinforcing plate shown in FIG.

FIG. 3 is a partially cutaway front view showing a second embodiment of the exhaust muffler according to the present invention.

FIG. 4 is a partially cutaway front view of a conventional exhaust muffler.

[Explanation of symbols]

 1, 20 Exhaust muffler 2 Muffler body 3, 4 End plate 8, 9 Partition plate 16, 17 Auxiliary plate

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Motoya Makino F-term (reference) 3G004 CA11 DA08 DA21 FA04 GA01 GA06 in 5-33 Shiba 5-chome, Minato-ku, Tokyo

Claims (2)

[Claims] An exhaust muffler mounted on a prime mover, comprising:
A partition plate which defines the inside of the chamber as a plurality of chambers and has a flange formed by bending an outer peripheral portion to one side and welded to the inner wall of the muffler body; and a substantially L-shaped partition plate, one side of the flange of the partition plate And an auxiliary plate welded on the opposite side to the other side and welded to the inner wall of the muffler body. 2. The exhaust muffler according to claim 1, wherein the welding structure of the auxiliary plate to be welded to the partition plate is fillet welding by intermittent welding.