JPS6032343Y2 - Drainage device for upright exhaust pipes for internal combustion engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a draining device for an upright exhaust pipe for an internal combustion engine.

In a cargo handling vehicle such as the one shown in FIG. 1, an exhaust pipe 2 of an internal combustion engine mounted on the vehicle 1 is provided in an upright position.

However, since the exhaust pipe of an internal combustion engine is cold in the initial stage of startup, the exhaust gas is cooled down while passing through the exhaust pipe, and water droplets that are formed as a result of this run along the inner wall surface of the exhaust pipe 2 and pass through the exhaust port along with the exhaust gas. This poses a problem in that it blows out and stains drivers and vehicles.

Therefore, as shown in the first figure, a draining device A has been conventionally provided at the outlet end of the exhaust pipe 2 to prevent water droplets from blowing out.

The conventional draining device A has a cylindrical perforated pipe 3 at the end of the exhaust pipe 2, as shown in an enlarged cross section in FIG.
A water-absorbing substance 4 such as glass wool or rock wool is wrapped around the outer peripheral surface of the perforated tube 3, and the outside thereof is further covered with a shell 5.

However, in the draining device having the above-mentioned conventional structure, the perforated pipe 3 is directly connected to the pipe end of the exhaust pipe 2.
When the water droplets generated on the inner wall surface of the exhaust pipe 2 are entrained by the exhaust gas and flow out, they are not absorbed by the water-absorbing substance 4 through the drainage hole 3a of the perforated pipe 3, but are transmitted straight along the inner surface of the perforated pipe 3. There was a problem that the water was discharged into the water, and the water draining effect was poor.

The present invention was developed by focusing on the above-mentioned drawbacks of the conventional exhaust pipe. A diffuser that expands in a trumpet shape is connected to the end of the exhaust pipe to form an expansion chamber, and a perforated pipe connected to the diffuser is connected to the end of the exhaust pipe. It is formed into a tapered shape that gradually decreases in diameter as it goes toward the exhaust pipe, and the opening at the tip is made to have the same diameter or a slightly larger diameter than the exhaust pipe, and a water-absorbing material is wrapped around the outer periphery of this perforated tapered pipe, and a shell is wrapped around the outer periphery of the perforated tapered pipe. In this structure, when the exhaust gas flows into the expansion chamber, the water droplets that are diffused and accompanied by the exhaust gas are guided toward the inner circumferential surface of the perforated tapered pipe, and the water absorbent substance is reliably absorbed through the drain hole. It is an object of the present invention to provide a water draining device for an upright exhaust pipe for an internal combustion engine, which is capable of absorbing water.

Next, an embodiment of the present invention will be described with reference to FIG. 3, in which parts common to those in FIGS. 1 and 2 are given the same reference numerals.

The draining device A according to the present invention includes a tapered tubular diffuser 6 that is connected to the end of the exhaust pipe 2 and expands in a trumpet shape.
and a perforated tapered pipe 9 which is connected to the diffuser 6 and has a large number of drainage holes 9a in its outer peripheral surface and whose diameter decreases as it reaches the tip opening 9b;
It is composed of a water-absorbing material 4 wrapped around the outer periphery of the water-absorbing material 4 and a shell 5 enclosing it. The diffuser 6 has a large diameter, and an expansion chamber 10 is formed by the diffuser 6 .

Next, the operation of the above embodiment will be explained.

When the internal combustion engine starts, the exhaust pipe 2 is cold, so the exhaust gas is cooled and water droplets are formed on the inner wall surface of the exhaust pipe 2.
These water droplets are carried to the outlet end by the exhaust gas flow, but are rapidly diffused when the exhaust gas flow flows into the diffuser 6 from the pipe end of the exhaust pipe 2. The water is blown away in the direction of the inner peripheral surface of the perforated tapered pipe 9 and absorbed by the water-absorbing substance 4 through the drainage holes 9a, 9a, . . . of the perforated tapered pipe 9.

The water absorbed by the water-absorbing material 4 evaporates due to the heat as the exhaust pipe 2 warms up, and the water-absorbing material 4 is gradually dried to its original state.

FIG. 4 shows another embodiment of the present invention, in which a diffuser is used to guide the course of the water droplets scattered by the exhaust gas flow to the inner circumferential surface of the perforated tapered pipe 9. A conical wall body 7 having an outer peripheral surface substantially parallel to the taper of the diffuser 6 is supported by support arms 8, 8 and installed in the expansion chamber 10.

This conical wall 7 may be provided with substantially the same function as the conical wall 7 by means of a partial conical wall 7av7a, as shown in FIG.

By installing the conical wall 7 or the conical walls 7a, 7a in the expansion chamber 10 as described above, when exhaust gas flows into the diffuser 6 and diffuses, the flow is directed to the conical wall 7.
Alternatively, it is reliably guided toward the inner circumferential surface of the perforated tapered pipe 9 along the outer circumferential surface of the conical walls 7a, 7a, and the drain hole 9a
The water draining effect can be made even more effective.

As explained above, the draining device of the present invention includes a trumpet-shaped diffuser connected to the outlet end of the exhaust pipe,
A perforated tapered pipe connected to this diffuser and having a tapered shape forms a pipe section, and this diffuser forms an expansion chamber, so that water droplets generated when the internal combustion engine is started are discharged by the exhaust gas flow. When the water droplets flow into the expansion chamber in the diffuser and are diffused, the water droplets that are accompanied by the exhaust gas and fly can be naturally guided to the inner circumferential surface of the perforated tapered pipe. The water can be discharged to the outside and effectively absorbed by the water-absorbing material on its outer periphery, and the draining effect can be further improved by installing a conical wall inside the expansion chamber as shown in FIG.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a vehicle to which the present invention is applied, FIG. 2 is a cross-sectional view of a conventional ice cutting device, FIG. 3 is a cross-sectional view showing an embodiment of a water draining device according to the present invention, and FIG. The figure is a sectional view showing an embodiment of the rotor, and FIG. 5 is an enlarged front view showing a modification of the conical wall body in FIG. 4. 1... Vehicle, 2... Exhaust pipe, 4...
... Water-absorbing substance, 5 ... Shell, 6 ...
... Diffuser, 7... Cone wall, butt...
...Support arm, 9...Perforated tapered tube, 9
a... Drain hole, 10... Expansion chamber.

Claims (1)

[Scope of utility model registration request] In a water draining device that is installed at the end of an upright exhaust pipe for an internal combustion engine and prevents water droplets generated on the inner wall of the exhaust pipe from blowing out, a diffuser that expands in a trumpet shape is connected to the end of the exhaust pipe. An expansion chamber is formed at the end, and the diffuser has a diameter that gradually decreases as it reaches a tip opening, and the opening has the same diameter or a slightly larger diameter than the exhaust pipe, and has a large number of drainage holes on the outer peripheral surface. A water draining device for an upright exhaust pipe for an internal combustion engine, which comprises a perforated tapered pipe connected to the perforated tapered pipe, a water-absorbing substance wrapped around the outer circumferential surface of the perforated tapered pipe, and a shell provided around the outer circumference.