JPH0610143Y2 - Silencer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a silencer for an internal combustion engine.

[Prior art]

A silencer for an internal combustion engine has a problem that condensed water accumulates inside the silencer and the silencer is corroded.

As a conventional method for draining the condensed water, as shown in FIG. 3, a water passage hole 2 is formed at the lower end of the wall of the muffler 1 and the outlet pipe 4 is provided at the upper end in a predetermined chamber 3.
A drain pipe 5 having a lower end opened to the bottom surface of the chamber 3, and a pressure generated at the open end of the drain pipe 5 into the chamber 3 and a pressure generated at the open end of the outlet pipe. There is a system in which the condensed water accumulated in the chamber 3 is pumped up from the drain pipe 5 and discharged out of the device through the outlet pipe 4 by the pressure difference.

[Problems to be solved by the present invention]

As described above, in the case of pumping water from the drain pipe 5 by the differential pressure, since the drain pipe 5 is long,
When the engine speed is low and the differential pressure is low, there is a problem that condensed water is not sufficiently pumped. Further, in the muffler of recent years, since the exhaust resistance is small, the differential pressure is not so high in the above method, and the drainability thereof is deteriorated.

Therefore, the present invention aims to improve the drainability of the condensed water by utilizing the exhaust flow in the silencer without using the differential pressure.
In particular, it is an object of the invention to propose a silencer in which the drain pipe is easily attached.

[Means for Solving the Problems]

In order to solve the above problems, the present invention mounts the exhaust gas introduction end of the outlet pipe with a small amount of protrusion from the mounting picture wall, and bends the outer periphery of the exhaust pipe end toward the bottom wall of the outer shell. The silencer is characterized in that the drain pipe having its exhaust inlet port close to the bottom wall is extendedly fitted and connected, and the base of the drain pipe is fixed to the wall of the outlet pipe. Is.

[Action]

The exhaust gas that flows in from the inlet pipe 15 passes through each chamber,
It enters the outlet pipe 16 through the inlet 17b of the drainage pipe 17, flows through the pipe 11 and is discharged to the outside of the device. In this exhaust flow, the exhaust entering the inlet 17b is the drain pipe 17
Is bent to the side of the bottom wall 6a, and as shown by the arrow A in FIG.
Inflow from 17b. Therefore, the condensed water W accumulated on the bottom wall 6a is sucked into the drain pipe 17 together with the exhaust flow and drained out of the device.

〔Example〕

Next, an embodiment of the present invention shown in FIGS. 1 and 2 will be described.

6 is the outer shell of the muffler, the inside of which is three painting walls 7, 8, 9
Is divided into a plurality of chambers 10, 11, 12, and 13. A water passage hole 14 is formed at the lower end of each drawing wall. Reference numeral 15 is an inlet pipe for introducing exhaust gas, and its downstream end is the second chamber 11
It is open to. 16 is an outlet pipe for exhaust,
The exhaust gas introducing end 16a penetrates the image wall 9 and is fixed, and the amount of protrusion from the image wall 9 is small. Reference numeral 17 denotes a drain pipe, the base portion 17a of which is fitted to the outer periphery of the end portion 16a of the outlet pipe 16 and which is welded and fixed to the drawing wall 9 to be extendedly provided at the end portion 16a. The drain pipe 16
The inlet side of is bent to the bottom wall 6a side of the outer shell 6,
17b is directed to the bottom wall 6a near the bottom wall 6a. 18
Is an inner pipe connecting each room. In the figure, W indicates condensed water.

[Effect of device]

As described above, the present invention is a silencer in which the drainage pipe bent to the bottom wall is extendedly provided at the exhaust introduction end of the outlet pipe, so that the silencer has a low differential pressure in the silencer chamber when the engine rotation is low. However, it is possible to sufficiently discharge the condensed water from the outlet pipe. Therefore, it is possible to prevent corrosion of the silencer due to condensed water, and to propose a silencer having high durability. Moreover, since the outlet pipe and the drainage pipe are formed separately and the base portion of the drainage pipe is fixed to the drawing wall, the outlet pipe and the drainage pipe can be attached very easily.

[Brief description of drawings]

1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged side sectional view showing an exhaust gas introducing portion of an outlet pipe, and FIG.
The figure is a side sectional view of a conventional structure. 6 ... Outer shell, 6a ... Bottom wall, 9 ... Installation wall, 16 ... Outlet pipe, 16a ... Exhaust inlet end, 17 ... Drain pipe, 17a ... Base, 17b ... Inlet

Claims (1)

[Scope of utility model registration request] 1. An exhaust gas introduction end portion of an outlet pipe is attached with a small amount of projection from the mounting picture wall, and the exhaust gas introduction port is bent on the outer periphery of the projection end portion toward the bottom wall side of the outer shell. A silencer characterized in that a drainage pipe that is brought close to a bottom wall is extendedly fitted and connected, and further, a base portion of the drainage pipe is fixed to a mounting wall of the outlet pipe.