JPH0331887B2 - - Google Patents

Description

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

Generally, exhaust gas discharged from the internal combustion engine of an industrial vehicle, such as a forklift, passes through a muffler body 2 in a counterweight 1, as shown in FIG. This is a so-called upright exhaust pipe), and is discharged to the outside through a bent outlet 4 at the tip of this exhaust pipe 3.

In the middle of the exhaust pipe 3, when the exhaust pipe 3 is cold, such as when starting the engine, water vapor in the exhaust gas is cooled and condensed into water droplets, which are pushed by the exhaust gas pressure and are A draining device 5 is provided to prevent water from being discharged from the outlet 4 to the outside.

Conventionally, there is a type of draining device 5 as shown in FIG. 1B, for example. (Published by Nissan Motor Co., Ltd. in 1979, parts catalog F02 type forklift No. 340-
(Page 2, etc.) First, the inside of the cylindrical device main body 6 is divided into a chamber 9 filled with glass wool 8 and a simple hollow expansion chamber 1 at the top and bottom in the figure by a baffle plate 7.
0.

The expansion chamber 10 has a tip (open end) 3a of an exhaust inlet tube 3A from the bottom in the figure.
is supported and protruded by the bottom wall 6A of the apparatus main body 6, and the rear end (opening end) 3b of the exhaust outlet side tube 3B penetrates the chamber 9 from above in the figure to the upper wall of the apparatus main body 6. Part 6B and full plate 7
It is supported and protruded by.

The exhaust inlet side tube 3A has its tip 3
It communicates with the expansion chamber 10 through a plurality of small holes 11 formed in the peripheral wall of a, while the exhaust outlet side tube 3B
similarly communicates with the expansion chamber 10 and also with the chamber 9 via a plurality of small holes 12 formed in the peripheral wall of the rear end portion 3b.

In addition, 13A and 13B in the figure are a drain hole and a drain pipe provided in the bottom wall portion 6A.

Therefore, in this draining device 5, when the exhaust gas first flows into the expansion chamber 10 from the exhaust inlet tube 3A, most of the water (water droplets) contained in the gas is removed by reducing the flow velocity. is separated, and the separated moisture is discharged to a predetermined outside via a drain hole 13A and a drain pipe 13B provided in the bottom wall portion 6A.

Then, the moisture that could not be separated flows into the exhaust outlet tube 3B together with the exhaust gas.
When water flows from there into the chamber 9 through the small hole 12, it is absorbed by the glass wool 8 filled in the chamber 9.

In this way, the moisture contained in the exhaust gas is removed step by step, and only the gas components flow out from the exhaust outlet tube 3B and are discharged to the outside through the above-mentioned discharge port 4 (see Figure 1). It will be done.

However, in the case of such a conventional draining device 5, the draining performance of the entire device is ensured by the two-stage structure of the above-mentioned draining ability in the expansion chamber 10 and the draining ability due to the water absorbency of the glass wool 8. Because of this structure, when the period of use becomes long and carbon in the exhaust gas adheres to the surface of the glass wool 8, the water absorbency of the glass wool 8 deteriorates, and the performance as a draining device also deteriorates. It was hot.

This invention was made by paying attention to such conventional problems, and instead of ensuring water drainage performance with the glass wool described above, a new material is installed inside the expansion chamber of the main body of the device and located below it. The above problem can be solved by interposing a drainage mechanism having cylindrical parts that overlap with each other at a predetermined interval on at least one of the open exhaust inlet tube and the open exhaust outlet tube located above. The purpose is to solve the problem.

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 2, in this embodiment, the entire interior of the device main body 6 is formed as an expansion chamber 10 having a predetermined volume, and the exhaust inlet tube 3A is located below the expansion chamber 10, and the exhaust outlet tube 3A is located above the expansion chamber 10. side chive 3
B are each open-connected.

Opening end 3b of the exhaust outlet side tube 3B
simply has its lower end open and communicates with the expansion chamber 10.

And, located around this opening end 3b,
A cylindrical member 15 is provided that drains the exhaust gas flowing from the bottom to the top in the figure by making a downward U-turn.

This cylindrical member 15 is a bottomed cylinder with an open upper end, and the open end 15A is connected to the exhaust outlet side tube 3.
It is superimposed over a predetermined length at a predetermined circumferential interval on the outside of the open end 3b of the cylinder B, and is attached to the device main body 6 via a ring-shaped baffle plate 7 at the outer circumference of the cylinder bottom 15B. fixed to the inner wall.

A plurality of through holes 7A are formed in the baffle plate 7 at predetermined intervals in the circumferential direction, and an expansion chamber 10 separated into upper and lower parts by the buffle plate 7 communicates with each other. I'm starting to do that.

The rest of the configuration is the same as that in FIG. 1B, so the same parts as in FIG. 1B are given the same reference numerals and detailed explanations will be omitted.

Because of this configuration, the exhaust gas that has just flown into the device body 6 from the exhaust inlet tube 3A flows from the bottom to the top in the figure in the expansion chamber 10 through the through hole 7A of the buff-full plate 7, and then flows here. Once there, the flow flows downward in the figure through the circumferential gap between the cylindrical member 15 and the exhaust outlet tube 3B, and is guided into the interior of the cylindrical member 15, and then flows upward again to the exhaust outlet tube 3B that opens at that part. It flows towards the outside of the device main body 6 (see arrow in the figure).

At this time, when the water droplets condensed in the pipe of the exhaust system on the engine side flow into the expansion chamber 10 from the exhaust inlet side tube 3A together with the gas components, the gas flow rate is reduced and the water droplets are separated from the gas components. It accumulates on the bottom wall portion 6A, and is discharged from there to a predetermined outside through the drain hole 13A and drain pipe 13B.

Water droplets condensed in the expansion chamber 10 below the buff-full plate 7 also flow down toward the bottom wall 6A because the gas flow rate in this area is slow, and are discharged in the same manner as described above.

On the other hand, the expansion chamber 1 above the full plate 7
The water droplets that have condensed inside 0 are accelerated by the fact that the gas flow velocity at this location is increased by passing through the through hole 7A of the buffer plate 7 and then passing through the narrow circumferential gap between the cylindrical member 15 and the device main body 6. , flows following the gas flow, and is guided into the inside of the cylindrical member 15 by making a U-turn from above to below, as described above.
Since the gas flow rate is reduced again inside this cylindrical member 15, the water droplets are eventually separated from the gas component and accumulated in the bottom portion 15B of the cylindrical member 15.

As a result, only exhaust gas flows out from the exhaust outlet side tube 3B.

In this embodiment, the performance of the draining mechanism made of the cylindrical member 15 is not affected in any way by the adhesion of carbon in the exhaust gas, so that a good draining effect can be maintained for a long period of time. Also,
Expansion chamber 10 and cylindrical member 1 that reduce gas flow rate
There is also the advantage that the interior of each section 5 has a silencing effect commensurate with its volume.

Next, FIGS. 3 and 4 show other embodiments of the present invention.

FIG. 3 shows the drain hole 1 of the cylinder bottom 15B of the cylindrical member 15 and the bottom wall 6A of the device main body 6 in FIG.
3A is connected with a drain pipe 13B, and the water accumulated in the cylinder bottom 15B is automatically drained.

In FIG. 4, the cylindrical member 15 in FIG. 2 is turned upside down, and its open end 15A is placed outside the open end 3a of the exhaust inlet tube 3A at a predetermined circumferential interval to a predetermined length. This is an example in which the exhaust gas is polymerized over a long period of time, and then the flow of exhaust gas is made to make a downward U-turn at the exhaust inlet side. For this purpose, the open end 3a of the exhaust inlet tube 3A is communicated with the expansion chamber 10 by simply opening its upper end.

As explained above, according to the present invention, a predetermined portion is provided in at least one of the exhaust inlet tube located below and open and the exhaust outlet tube located above and opened inside the expansion chamber of the device main body. By installing a drainage mechanism with cylindrical parts that overlap at intervals, it is possible to maintain good drainage performance over a long period of time without being affected by the adhesion of carbon, etc. in the exhaust gas. Effects can be obtained.

In addition, particularly according to the present invention, the flow of exhaust gas is reliably reversed from upward to downward and then upward again at the overlapping portion of the draining mechanism, so that the inertial force of the condensed water itself contained in the exhaust is effectively utilized. This can be used to separate them very efficiently.

[Brief explanation of the drawing]

Figure 1A is an overall side view of the forklift;
FIG. B is an enlarged sectional view of a conventional example, FIG. 2 is an enlarged sectional view of an embodiment of the present invention, and FIGS. 3 and 4 are enlarged sectional views of other embodiments of the invention. 3...Upright exhaust pipe, 5...Draining device, 6...Device main body, 10...Extension chamber, 3A...Exhaust inlet side tube, 3B...Exhaust outlet side tube, 15...
Cylindrical member, 15A...Open end, 15B...Cylinder bottom, 3a, 3b...Open end, 7...Boutful plate.

Claims (1)

[Scope of Claims] 1. A draining device for an upright exhaust pipe of an internal combustion engine, which is installed in the middle of the upright exhaust pipe and has an expansion chamber inside the main body that reduces the flow velocity of exhaust gas and separates moisture in the exhaust gas. In the expansion chamber, at least one of an exhaust inlet tube located below and open and an exhaust outlet tube located above and open is provided with a cylindrical portion that overlaps at a predetermined distance. A water draining device for an upright exhaust pipe, characterized in that a water draining mechanism is provided. 2. A drainer for an upright exhaust pipe according to claim 1, wherein the drainer mechanism is a bottomed cylindrical member with an open top that overlaps the outside of the open end of the exhaust outlet tube with a predetermined circumferential interval. Device. 3. A drainer for an upright exhaust pipe according to claim 1, wherein the drainer mechanism is a bottomed cylindrical member with an open lower end that overlaps the outside of the open end of the exhaust inlet tube with a predetermined circumferential interval. Device.