JP2006125297A - Drain structure of vehicle muffler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain structure of a vehicle muffler efficiently discharging condensation water in the vehicle muffler to the outside from an initial stage of generation. <P>SOLUTION: The vehicle muffler 1 enclosed by two end plates 4, 5 and a shell 6 is provided therein with an inlet pipe for letting exhaust gas flow in, an outlet pipe 8 for discharging the exhaust gas and a heat storage plate 10 contacting with a bottom of the shell 6, storing heat of the exhaust gas and evaporating the condensation water. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drainage structure for a vehicle silencer, and more particularly to a drainage structure for a vehicle silencer that can discharge condensed water accumulated in the vehicle silencer from the initial stage even after the engine is stopped.

Conventionally, as shown in FIG. 4, a vehicle silencer is defined in a plurality of chambers by a plurality of inner plates 03a, 03b having two through holes 03h, 03i and two end plates 03c, 03d. In addition, by providing the inlet pipe 03f and the outlet pipe 03g in a state of passing through these chambers, the exhaust gas (shown by a one-dot chain line arrow) circulates from the inlet pipe 03f through the through holes 03h and 03i. After that, it is structured to be discharged from the outlet pipe 03g.
Further, if condensed water or soot 05 generated by cooling the exhaust gas is collected at the bottom of the shell 03e, rust is likely to be generated in the vehicle silencer, which increases costs such as changing to an expensive material. . Moreover, it becomes a cause of noise generation.
Therefore, a drain pipe 09 communicating with the outlet pipe 03g or an equivalent thereof is provided toward the bottom of the shell 03e, and sucks condensed water and soot 05 as indicated by a broken line arrow using the intake pressure of the exhaust gas. The technique of exhausting together with the exhaust gas is known (see Patent Documents 1 and 2).
Japanese Utility Model Laid-Open No. 1-142513 Japanese Utility Model Publication No. 58-8711

  However, the drainage structure of the vehicle silencer described in Patent Document 1 requires a clearance between the drain pipe 09 and the bottom of the shell 03e, and therefore does not function until the water level of the condensed water rises. There is a problem that water cannot be discharged from the initial stage where water is generated, and it cannot be discharged even if condensed water is generated after the engine is stopped.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vehicle muffler that can efficiently discharge condensed water in a vehicle muffler from the initial stage of generation to the outside even after the engine is stopped. Is to provide a water drainage structure for the vessel.

  In the invention according to claim 1 of the present invention, an inlet pipe for allowing exhaust gas to flow into a vehicle silencer surrounded by two end plates and a shell, and an outlet pipe for discharging exhaust gas, A heat storage plate for storing the heat of the exhaust gas and evaporating the condensed water is provided.

  In the invention according to claim 1, an inlet pipe for allowing exhaust gas to flow into a vehicle silencer surrounded by two end plates and a shell, and an outlet pipe for discharging exhaust gas, Since a heat storage plate that contacts the bottom of the shell and stores the heat of the exhaust gas to evaporate the condensed water is provided, the condensed water is evaporated by the heat storage plate using the heat of the exhaust gas and removed from the outlet pipe together with the exhaust gas. Since the shell temperature can be maintained even after the engine is stopped, the generation of condensed water can be suppressed from the initial stage to after the engine is stopped.

  Embodiments of the present invention will be described below with reference to the drawings.

Example 1 will be described below.
FIG. 1 is an overall view showing a drain structure of a vehicle silencer according to an embodiment of the present invention, FIG. 2 is a perspective view showing a heat storage plate of the first embodiment, and FIG. 3 is a diagram for explaining other heat storage plates. .

First, the overall configuration will be described.
As shown in FIG. 1, the vehicle silencer 1 adopting the drainage structure of the vehicle silencer of this embodiment includes two inner plates 2 and 3, end plates 4 and 5, a shell 6, and the like. The inlet pipe 7, the outlet pipe 8, the introduction pipe 9, and the heat storage plate 10 are the main components.

  The outer shapes of the inner plates 2 and 3 and the end plates 4 and 5 are formed in a flat elliptical shape, and the shell 6 is wound around the outer periphery of the inner plates 2 and 3 and is fixed by welding outside the figure. As a result, the interior of the vehicle silencer 1 is defined into three chambers A, B, and C.

  The inlet pipe 7 is provided in a state of penetrating the end plate 4 and the inner plate 2, and a plurality of exhaust gas circulation holes 7 a are formed in the chamber A.

  Further, a hollow introduction pipe 9 communicating with the inside of the inlet pipe 7 is provided so as to penetrate the inner plate 2 and face the side of a heat storage plate 10 described later.

A heat storage plate 10 shown in FIG. 2 is provided at the bottom of the shell 6 in the chamber B.
Specifically, the heat storage plate 10 is formed in a plate shape, and both ends thereof are welded to the flange portions 2a and 3a of the inner plates 2 and 3 in a state where the bottom portion is in contact with the bottom portion of the shell 6. It is fixed with X.
In addition, a wave-shaped wave portion 10a is formed in the upper portion of the heat storage plate 10, and has a shape that easily receives the exhaust gas 12b of the introduction pipe 9 and stores the heat.
The heat storage plate 10 is formed with a predetermined width W1 and length W2 so as to be directly under the outlet of the inlet pipe 7 and directly under the inlet of the outlet pipe 8.
As other shapes of the heat storage plate 10, as shown in FIG. 3, a wave portion 10b having the same shape as the wave portion 10a may be provided in the lower portion of the heat storage plate. At this time, if the tops of the upper and lower wave portions 10a and 10b are provided so as to be offset from each other, the heat storage efficiency is improved.

  The material of the heat storage plate 10 is preferably a material whose surface temperature is raised to 100 ° C. or more by exhaust gas and the temperature can be maintained for as long as possible. For example, ceramic or carbon is preferable. , Other, zinc, aluminum, antimony, sulfur, indium, cadmium, potassium, gallium, calcium, gold, silver, silicon, germanium, cobalt, samarium, tin, strontium, cesium, cerium, selenium, thallium, titanium, tellurium, copper Various substances such as sodium, lead, nickel, barium, bismuth, arsenic, beryllium, magnesium, manganese, iodine, lanthanum, lithium, phosphorous, rubidium, etc. It can be suitably selected according to the amount.

The outlet pipe 8 is provided in a state of penetrating the end plate 5 and the inner plate 3, and a plurality of exhaust gas circulation holes 8 a are formed in the chamber C.
In addition, the chambers A and C may be filled with a sound absorbing material (not shown).

Next, the operation will be described.
In the muffler drain structure for a vehicle silencer thus configured, an exhaust gas upstream exhaust pipe (not shown) is connected to the inlet pipe 7, and an exhaust gas downstream exhaust pipe (not shown) (not shown) 1 is connected, the exhaust gas 12 (about 500 ° C.) shown by the alternate long and short dash line flowing into the inlet pipe 7 from the upstream exhaust pipe is guided to the chamber B as shown in FIG. Then, a part 12a of the exhaust gas 12 flows into the chamber A through the exhaust gas circulation hole 7a and is silenced by the sound absorbing material while being subjected to the expansion / contraction action.

Further, a part 12b of the exhaust gas flows into the introduction pipe 9 and hits the side of the heat storage plate 10, whereby the heat storage plate 10 is heated to a high temperature (100 ° C. or higher) in a short time.
Next, after the exhaust gas 12 guided to the chamber B is subjected to expansion / contraction action, the exhaust gas 12 flows into the outlet pipe 8 and flows to the downstream exhaust pipe. It flows into the chamber C through 8a and is muffled by the sound absorbing material while receiving the expansion / contraction action.

Here, if the condensed water in which the moisture in the exhaust gas is condensed with the stop of the engine continues to accumulate in the bottom 2a of the shell 6, rust is likely to be generated in the vehicle silencer 1 or noise is generated. .
However, in the drainage structure of the vehicle silencer of the first embodiment, the heat storage plate 10 receives the exhaust gas 12b from the introduction pipe 9 and heats up the heat storage plate 10 in a short time. The water can be evaporated and discharged out of the outlet pipe 8 as indicated by the dashed arrow.

  In addition, the heat storage plate 10 can prevent a sudden temperature drop in the chamber B, and during that time, it can be evaporated and discharged, so that the generation of condensed water can be suppressed, so the next time the engine is run In addition, the condensed water is ejected from the end of the exhaust pipe, and the surroundings are not contaminated.

Furthermore, the condensed water 11 generated in the inlet pipe 7 or the outlet pipe 8 can be directly evaporated to the heat storage plate 10 directly below and efficiently evaporated in a short time with a relatively small heat capacity.
In addition, when the inlet pipe 7 and the outlet pipe 8 are provided in a state where the inlet pipe 7 and the outlet pipe 8 are inclined downward toward the chamber B, the condensed water 11 tends to accumulate toward the chamber B and easily fall off.

Next, the effect will be described.
As described above, in the drainage structure of the vehicle silencer of the first embodiment, the exhaust gas 12 is introduced into the vehicle silencer 1 surrounded by the two end plates 4 and 5 and the shell 6. Because the inlet pipe 7 for inflow, the outlet pipe 8 for exhausting the exhaust gas 12, and the heat storage plate 10 that contacts the bottom of the shell 6 and stores the heat of the exhaust gas 12 to evaporate the condensed water are provided. The heat storage plate 10 can be heated using the heat of the exhaust gas 12, and the condensed water can be evaporated by the heat storage plate 10 and discharged out of the outlet pipe 8 together with the exhaust gas 12, thereby generating the condensed water. It can be suppressed even after the engine is stopped from the initial stage.

  Moreover, since the hollow introduction pipe 9 communicated with the inside of the inlet pipe 7 protrudes toward the heat storage plate 10, the heat storage plate 10 can be quickly heated by the heat of the exhaust gas 12b to store heat.

  Furthermore, since the heat storage plate 10 is arranged directly under the outlet of the inlet pipe 7 or directly under the inlet of the outlet pipe 8, the condensed water 11 generated in the inlet pipe 7 or the outlet pipe 8 can be dropped directly on the heat storage plate 10 and efficiently evaporated. .

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within the scope not departing from the gist of the present invention are included in the present invention.
For example, the material, shape, number of installations, and fixing method of the heat storage plate 10 can be set as appropriate.
In the structure of the vehicle silencer having a structure in which the outlet pipe 8 passes through the inner plate 2 and opens into the chamber A, the heat storage plate 10 is provided in the chamber A, and a gap is formed in the lower portion of the inner plate 2. The condensed water generated in the installation chambers B and C may be guided to the chamber A.
Further, the detailed structure in the vehicle silencer 1 is not limited to the structure of the first embodiment, and can be adopted for all general vehicle silencers.
Furthermore, in Example 1, the exhaust gas 12b of the introduction pipe 9 was applied to the side of the heat storage plate 10 to raise the temperature of the heat storage plate 10, but the exhaust gas 12b may be applied from above, Alternatively, a flow path for circulating the exhaust gas 12b may be formed so that the temperature can be quickly raised.

BRIEF DESCRIPTION OF THE DRAWINGS It is a general view which shows the drain structure of the muffler for vehicles of the Example of this invention. It is a perspective view which shows the thermal storage board of the present Example 1. FIG. It is a figure explaining another heat storage board. It is a general view which shows the water draining structure of the conventional silencer for vehicles.

Explanation of symbols

X Welding 1 Vehicle silencer 2, 3 Inner plate 2a, 3a Flange part 4, 5 End plate 6 Shell 7 Inlet pipe 7a, 8a Exhaust gas flow hole 8 Outlet pipe 9 Introducing pipe 10 Heat storage plate 10a Wave part 11 (Inlet pipe) 7 or the condensed water 12 generated in the outlet pipe 8) Exhaust gases 12a, 12b, 12c Part of the exhaust gas

Claims (1)

An inlet pipe for flowing exhaust gas into a vehicle silencer surrounded by two end plates and a shell;
An outlet pipe for discharging exhaust gas;
A water draining structure for a vehicle silencer, comprising a heat storage plate that contacts the bottom of the shell and stores heat of exhaust gas to evaporate condensed water.

Images