JP2001055917A - Exhaust smoke removal device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove smoke components in an engine exhaust gas. SOLUTION: This device has a mesh-like basket in a state of covering an engine exhaust pipe 6 outlet, a paper filter provided on the inner circumference of the basket, and a nozzle for spraying water on the side of the exhaust pipe 6 to the position of the filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing exhaust smoke of an internal combustion engine such as a diesel engine.

[0002]

2. Description of the Related Art FIG. 4 is a side sectional view of a muffler 2 provided in an exhaust pipe 6 of a conventional diesel engine. An enlarged portion 6A having an enlarged exhaust passage area is fixed to an end of the exhaust pipe 6, and a muffling portion 2 is provided downstream of the enlarged portion 6A.

[0003] Exhaust gas from an internal combustion engine such as a diesel engine (hereinafter, referred to as an engine) temporarily expands through an exhaust pipe 6 in an enlarged portion 6A, and flows through an inner cylinder 2A and an outer cylinder 2B in a noise reduction section 2. The exhaust noise is reduced, and the exhaust is discharged from the outlet 2b to the atmosphere.

[0004] That is, the exhaust gas from the exhaust pipe 6 only reduces the exhaust noise when passing through the muffling section 2, does not remove the smoke in the exhaust gas, but contains the smoke. Exhaust gas is released to the atmosphere.

[0005]

The smoke emitted from these internal combustion engines not only has a bad smell but also contains substances harmful to the human body. Therefore, it is desired to remove the smoke component discharged from the internal combustion engine. An object of the present invention is to provide an exhaust gas removal device for an internal combustion engine for these exhausts.

[0006]

SUMMARY OF THE INVENTION A filter is provided between an exhaust pipe and an outlet of the exhaust pipe, and the filter removes smoke in the exhaust gas.

In this case, in order to prevent the filter from being carbonized or prematurely deteriorated by exhaust heat, a nozzle is provided in the exhaust stream in front of the filter, and the water is sprayed from the nozzle to keep the filter moist. I am trying to become.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

[0009]

FIG. 1 is a system diagram showing an exhaust gas removing apparatus for an internal combustion engine according to the present invention. An exhaust pipe 6 from an internal combustion engine (hereinafter, referred to as an engine) is provided with an exhaust flow expanding section 6A, a stirring section 1, a conventional silencing section 2 shown in FIG.

FIG. 2 is a side sectional view showing a part of the enlarged section 6A, the stirring section 1, and the muffling section 2 in FIG. FIG. 3 shows a part of the muffling unit 2 and the purifying unit 3 in FIG.
FIG.

A nozzle (noz) fixed to the enlarged portion 6A of FIG.
zle) 5a is connected on one side to a pipe 5a from a water tank 5 (FIG. 1) and on the other hand to an air tank 4
From the nozzle 4 through the pipe 4a and the valve 4A.
A (FIG. 2).

In the stirring section 1, a bearing 1a is fixed to a holding member 1b fixed to a casing 1A, and a rotating shaft 1c is rotatably fitted to the bearing 1a. A turbine blade 1d and an impeller 1e are fitted on the rotating shaft 1c.

The silencer 2 partially shown in FIGS. 2 and 3 has the same configuration as the conventional silencer 2 described in FIG.

In FIG. 3, the casing 3A of the purifier 3
The holder 3B is detachably fitted to the holder. Holder 3
B includes a cage 3d in which a stainless wire or the like is meshed in a fitting portion 3a formed in the outlet casing 3b, and a flange 3c fitted around the entrance of the basket 3d.
The flange 3c is fitted to a fitting 3g formed on the casing 3A.

The holder 3 fitted to the casing 3A
In order to prevent B from falling off, a retaining ring 3f is fitted in a groove 3h provided at an end of the casing 3A.

A paper-shaped filter 3e is attached to the inner periphery of the cage 3d in a bag shape, and the filter 3e is in a state of covering the outlet 2b of the sound deadening section 2. Further, fibers such as nylon are woven into the filter 3e as a reinforcing material, but it is not always necessary to woven them. The degree of the mesh of the filter 3e is 0.0
1 to 1 μm.

Hereinafter, the operation will be described. The valve 4A is opened at the same time when the engine is operated. Exhaust gas from the engine is discharged to the exhaust pipe 6 by the operation of the engine, and compressed air from the air tank 4 is supplied to the pipe 4a.
(FIG. 1), nozzle 5A via valve 4A and pipe 4b
(Fig. 2). The water from the tank 5 is sprayed from the nozzle 5A as spray 5b by the compressed air blown from the nozzle 5A.

The exhaust flow from the exhaust pipe 6 and the nozzle 5A
Causes the turbine blade 1d to rotate. The rotation rotates the impeller 1e via the rotation shaft 1c. As shown in FIG. 2, the rotation of the impeller 1e sends the exhaust stream from the exhaust pipe 6 and the spray 5b to the outer periphery as shown by an arrow a while stirring the spray 5b.

That is, the exhaust flow from the exhaust pipe 6 is prevented from escaping straight to the silencer 2, and the rotation of the impeller 1e guides the exhaust flow once radially outward as indicated by the arrow a. However, the spray 5b and the exhaust gas are sufficiently mixed.

The mixed gas flow of the exhaust gas and the water spray sent to the outer periphery in this way is further agitated by the rotation of the turbine blade 1d, and the agitated flow b is generated by the inner cylinder 2A in the sound deadening section 2. The air passes through the silencer 2 from the inlet 2a and is discharged to the outlet 2b. The exhaust stream from the outlet 2b further enters the chamber 3C of the purification unit 3 in FIG.

In this case, the swirling flow b in FIG.
While passing through the sound deadening section 2, the exhaust gas and the water spray are further mixed, and in particular, moisture also adheres to the carbonized solid that is a component of smoke contained in the exhaust gas.

As described above, the exhaust containing the smoke component to which the moisture is attached and the water vapor are generated as shown by the flow of the arrow in FIG.
The air passes through the filter 3e and the mesh portion of the net-shaped basket 3d, and is discharged from the outlet casing 3b to the atmosphere.

In the exhaust flow indicated by the arrow in FIG. 3, the fine solid smoke component contained in the exhaust flow is collected by the filter 3e, and the smoke component in the exhaust discharged from the outlet casing 3b is largely reduced. Decrease. Further, at this time, since the fine solid substance as the smoke component is in a wet state as described above, when passing through the filter 3e,
It is easy to adhere to the mesh of the filter 3e without blowing through.

Since the exhaust stream passing through the filter 3e contains the water of the spray 5b as described above, the exhaust stream keeps the filter 3e moist. As a result, even if the high-temperature exhaust gas flows through the filter 3e, the high temperature does not cause the filter 3e to deteriorate early.

When the collecting action of the smoke component of the filter 3e elapses for a certain period, the filter 3e
e causes clogging. The filter 3e is replaced as described below every fixed period in which such clogging occurs.

When the retaining ring 3f is removed from the groove 3h in FIG. 3, the entire holder 3B can be extracted from the casing 3A. The attachment and detachment of the holder 3B and the replacement of the filter 3e may be performed collectively and professionally at, for example, a gas station or the like.

After taking out the filter 3e from the cage portion 3d with the holder 3B pulled out, the extracted filter 3e is a state in which a certain amount of used filters that have accumulated every several filter replacements have accumulated. This may be incinerated in a lump.

In this case, the filter 3e is a paper product containing no pollutant components, and the smoke component of the exhaust gas collected by the filter 3e can be incinerated at a time. Will be possible.

As described above, the filter 3
After extracting e, a new filter 3e is mounted on the basket 3d. The holder 3B after the mounting of the new filter 3e is mounted on the casing 3A by an operation reverse to the operation of extracting the holder 3B.

In the above description, a liquid deodorant may be mixed in the water in the tank 5 in FIG. In this case, the deodorizing material is agitated between the exhaust stream of the stirring section 1 and the spray in FIG. 2 so that the deodorant included in the spray wraps the malodor component in the exhaust stream, and the deodorant wraps the malodor component. Is
When the exhaust stream in FIG. 3 passes through the filter 3e,
It is collected by the filter 3e.

In the above embodiment, the muffling section 2
It is provided between the stirring section 1 and the purification section 3. However, the function of removing the smoke component in the exhaust gas and the silencing function in the present invention are independent problems. Therefore, the silencer 2 may be located closer to the engine than the nozzle 5A, or may be located closer to the exhaust outlet than the purifier 3.

However, when the silencing section 2 is provided between the stirring section 1 and the purifying section 3 as in the above-described embodiment, the water spray is mixed with the exhaust stream by the stirring section 1, and then the mixing is performed. Is silencer 2
It will be promoted by flowing through the complicated flow path.

Although the impeller 1e in FIG. 2 is driven by the turbine blade 1d driven by the exhaust flow, the impeller 1e may be driven by another electric motor or the like.

The attachment / detachment of the holder 3B is performed by attaching / detaching the retaining ring 3f. In this case, the holder 3B and the casing 3A are integrally formed, and the casing 3A is bolted to the casing 2C on the sound deadening section 2 side. It may be something.

In the above description, the valve 4A of FIG. 1 is kept open during the operation of the engine. However, the valve 4A may be opened and closed intermittently. That is, for the intermittent opening and closing time intervals, the valve opening time of the valve 4A may be a time sufficient for the water injection from the nozzle 5A to wet the filter 3e, and the valve closing time of the valve 4A is
It suffices if the next valve opening is performed before e is dried by the exhaust heat.

In FIG. 1, a valve is provided between the tank 5 and the pipe 5a, but the illustration is omitted.
Therefore, when the valve 4A is intermittently opened and closed, the supply of water from the tank 5 to the pipe 5a may be performed by opening and closing the valve in contact with the tank 5 in conjunction with the valve 4A.

[0037]

As described above, since the exhaust smoke is collected by the filter 3e in a wet state by spraying water from the nozzle 5A, fine solid components of the smoke are collected in the filter 3e in a wet state. It is easy to adhere, and the rate at which the fine solids are blown off from the mesh of the filter 3e is reduced.

Further, since the filter 3e is always in a wet state, the paper-like filter 3e is not deteriorated at an early stage due to high exhaust heat.

When the stirring section 1 is provided, the spray injected from the nozzle 5A is mixed with the exhaust gas in the stirring section 1, so that the water spray in the exhaust stream is uniformly mixed. as a result,
There is no fear that the exhaust stream passing through the filter 3e wets only a part of the filter 3e and the other part does not get wet. As a result, the filter 3e is uniformly wetted, and the entire filter 3e is uniformly protected from thermal deterioration.

[Brief description of the drawings]

FIG. 1 shows a system diagram of an exhaust smoke removing device for an internal combustion engine according to the present invention.

FIG. 2 is a side sectional view of a part of an exhaust pipe 6, an enlarged portion 6A, a stirring portion 1, and a muffling portion 2 in FIG.

FIG. 3 shows a side cross-sectional view of a part of the muffling unit 2 and a purifying unit 3 in FIG.

FIG. 4 shows a conventional silencer 2 by a sectional side view.

[Explanation of symbols]

1 stirrer, 1e impeller, 2 silencer, 2
b end exit, 3 purification section, 3d cage section, 3e
Filter, 4 air tank, 5 water tank,
5A nozzle, 6 exhaust pipe, 6A enlarged part.

Claims (2)

[Claims] 1. A paper filter (3e) is provided on the inner periphery of a net-like cage (3d) provided so as to cover an end outlet (2b) of an exhaust pipe of an internal combustion engine, and the exhaust is located from the position of the filter. An exhaust smoke removing device for an internal combustion engine, comprising a nozzle (5A) for spraying atomized water on a pipe side. 2. A paper filter (3e) is provided on the inner periphery of a mesh basket (3d) provided so as to cover an end outlet (2b) of an exhaust pipe of an internal combustion engine. A nozzle (5A) for spraying atomized water is provided on the side of the tube, and an impeller (1) for stirring exhaust gas from the exhaust pipe and the atomized water between the nozzle and the filter.
An exhaust smoke removing device for an internal combustion engine provided with e).