JPH0220417Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a muffler installed in an automobile exhaust system, and more particularly to a muffler improved to include an afterburn prevention function.

[Prior art]

Exhaust gas control systems such as coasting glitchers are conventionally known as methods to prevent afterburn, but these have complex device structures and increase the number of parts, increasing costs and also deteriorating fuel efficiency. There was this inconvenience.

[Purpose of invention]

Therefore, the present invention focuses on the fact that afterburn can be prevented by slowly burning the exhaust gas containing unburned components in the chamber of the exhaust system, and that the chamber of a silencer can be used as the chamber for this purpose. To provide a silencer which can effectively prevent the above problems and also prevent deterioration of fuel efficiency, has a simple structure, has a small number of parts, and has excellent workability.

[Structure of the idea]

For this purpose, the present invention provides a muffler connected to the exhaust manifold of the engine by a flange connection, and in a chamber on the exhaust inflow side of the muffler.
The heat storage plate is provided with a metal foil heat storage plate having a large number of minute ventilation holes, and the heat storage plate is supported by welding and fixing its holder together with the flange to the chamber shell. Regarding the inclusion of a metal member with many minute ventilation holes in the chamber of the exhaust system,
A related prior art can be found in Utility Model Application Publication No. 54-77813.

【Example】

The present invention will be specifically described below based on embodiments shown in the drawings. In FIG. 1, reference numeral 1 denotes an exhaust manifold of an engine, and a connecting flange 1a is provided at the end of the exhaust manifold on the exhaust outflow side. Therefore, cylindrical silencer 2
is bolted to the connecting flange 1a via a gasket 3, with a connecting flange 2a welded and fixed to the end on the exhaust inflow side by means described below,
The muffler 2 is connected directly downstream of the exhaust manifold 1. Another connecting flange 2b is welded and fixed to the end of the muffler 2 on the exhaust downstream side, and is flange-connected to an exhaust pipe (not shown) to constitute the subsequent exhaust system. Here, in the chamber of the muffler 2, a heat storage plate 4 is installed at a location on the exhaust gas inflow side facing the exhaust manifold 1 so as to cross the exhaust flow path. As shown in Fig. 2, the material of this heat storage plate 4 is made of two metal foils, upper and lower, that form a belt shape, one of which is attached to the other in a continuous wave shape in the length direction, and the bottom of the wave shape is attached to the other metal foil. Both are partially crimped together. By winding such a material into a roll shape, a disk-shaped heat storage plate 4 having a large number of minute ventilation holes 4a formed in the thickness direction as shown in FIG. 3 is constructed. Here, a stepped ring-shaped holder 5 is fitted on the outer periphery of the heat storage plate 4 with its small diameter part, and the large diameter part of this holder 5 is connected to the chamber shell 2 of the silencer 2.
c is fitted on the inner surface at a position directly below the connection flange 2a in FIG. Then, a long hole 2d for welding along the circumferential direction is bored in the circumferential surface of the chamber shell 2c corresponding to this portion (see FIG. 4).
Therefore, by forming a ring-shaped weld bead on the lower surface of the connecting flange 2a at the corner with the outer periphery of the chamber shell 2c, a part of the bead reaches the peripheral surface of the holder 5 through the elongated hole 2d, and the holder 5 is connected to the connecting flange 2a. It is also welded and fixed to the chamber shell 2c. Thereby, the heat storage plate 4 is installed in the chamber with its ventilation holes 4a aligned in the exhaust flow direction. In the above configuration, exhaust gas discharged from the engine (not shown) via the exhaust manifold 1 immediately passes through the ventilation hole 4a of the heat storage plate 4, expands within the chamber of the silencer 2, and is muffled, and is then used in the exhaust system. It is then released into the atmosphere. As the exhaust gas passes through, the heat storage plate 4 receives the thermal energy of the exhaust gas and stores heat therein. Therefore, when the exhaust gas containing unburned components passes through the ventilation hole 4a, it comes into contact with the high temperature heat storage plate and burns. This combustion occurs independently within each vent 4a, and since a large-volume chamber is formed downstream of the heat storage plate 4 to allow expansion due to exhaust gas combustion, the exhaust gas is combusted all at once. This prevents so-called afterburn. The only additional member to prevent such afterburn is the heat storage plate 4 fitted into the holder 5, and when installing it, the connecting flange 2a of the silencer 2 is welded at the same time. Since it can be fixed by welding, the structure is simple and the number of parts is small, which combined with excellent workability.

[Effect of the idea]

As explained above, according to the present invention, a heat storage plate made of metal foil with many minute ventilation holes is installed directly downstream of the exhaust manifold, so that the exhaust gas containing unburned components is absorbed by the heat of the heat storage plate. The fuel is then slowly burned in the vents to prevent afterburn. In addition, the structure is as simple as attaching a heat storage plate that allows exhaust gas to pass through to a conventional muffler, so not only does it not affect the combustion of the engine and cause a deterioration of fuel efficiency, but the heat storage plate also eliminates noise. Since it has a structure that can be welded and fixed at the same time using the welding process of the connecting flange of the device, it has the advantage of having a small number of parts, excellent workability, and being able to provide it at a low price.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a silencer showing an embodiment of the present invention, Fig. 2 is a perspective view showing the material of the heat storage plate,
FIG. 3 is a plan view of the heat storage plate, and FIG. 4 is a partial plan view of the vicinity of the connection flange of the silencer. 1... Exhaust manifold, 1a... Connection flange, 2... Silencer, 2a, 2b... Connection flange, 2c... Chamber shell, 2d... Long hole, 3
...Gasket, 4...Heat storage plate, 4a...
Ventilation hole, 5, 6... holder.

Claims (1)

[Scope of utility model registration request] A heat storage plate made of metal foil is connected to the exhaust manifold of the engine through a flange and has a large number of minute ventilation holes in the chamber on the exhaust inflow side. A silencer characterized in that it is supported by: