JP2002242657A - Particulate removing device for diesel engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for effectively removing particulate in an exhaust gas of diesel engine. SOLUTION: This particulate removing device 100 is provided with a main body 110 of cylindrical shape, and an introducing pipe 120 for the exhaust gas G1 of engine is mounted to the particulate removing device 100. The exhaust gas introduced into the main body generates a swirl flow C1, whereby the particulate PM is separated. A particulate separation member 150 having a brush of aluminum foil is attached to a tip of a pipe member 130 which exhausts the purified exhaust gas G2, thereby preventing the separated particulate from entering a flow C2 in a center part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying apparatus for collecting and removing soot in exhaust gas discharged from a diesel engine or the like.

[0002]

2. Description of the Related Art Hitherto, it has been proposed to provide a dust collector for collecting and removing particulates in exhaust gas, mainly in an exhaust gas purifying apparatus for a vehicle diesel engine. And as the dust collector, a gravity dust collector,
A centrifugal dust collector, an inertial dust collector, or the like is used. These dust collectors are devices that collect soot and dust by mechanical action. Also, among the various configurations of the centrifugal dust collector, a vortex cyclone type device is most common.

[0003] A centrifugal separation mechanism using a cyclone alone
It has been found that collecting particulates (fine particles) of 1 μm or less is difficult. When recovering particulates using a vortex cyclone, in order to improve the separation effect by centrifugal force, it is necessary to increase the mass by aggregating the particulates by collision.

FIG. 4 is an explanatory view showing an outline of a particulate removing apparatus using a vortex cyclone. (This type of apparatus is disclosed, for example, in Japanese Patent Laid-Open No. 7-158420.
This is also disclosed in the official gazette. The particulate matter removing device for a diesel engine, which is generally designated by reference numeral 1, has a cylindrical main body 10.
2 are provided. The inlet tube 12 is the inner wall portion 14 of the exhaust gas _{G 1} is a cylindrical body 10 which is fed into the main body 10
To generate a vortex (vortex cyclone) C ₁ along, it is arranged tangentially with respect to the main body 10.

The exhaust gas EG flowing along the inner wall portion 14 of the cylindrical main body 10 is applied to the wall surface 1 on the side opposite to the introduction pipe 12.
While forming a flow toward the side 6, a vortex cyclone flow VC is generated, and the particulate PM having a large mass is pushed outward and separated to the inner wall portion 14 side. Particulate PM exhaust gas G ₂ which has been purified is separated and removed is exhausted from the exhaust pipe 20 disposed along the axis of the main body 10 outward.

[0006]

[SUMMARY OF THE INVENTION However, in the particulate removal apparatus using a vortex cyclone of the above-described structure, particulate matter smaller fine particle size of the mass, caught in the flow F ₁ of the central portion of the cyclone is, there is a problem that is discharged while being contained in the exhaust gas G _2. Accordingly, the present invention provides a particulate removal apparatus that solves the above-described problem.

[0007]

SUMMARY OF THE INVENTION An apparatus for removing particulates in exhaust gas of a diesel engine according to the present invention is tangentially mounted on a cylindrical body and an outer peripheral portion near a first end of the body. An introduction pipe for introducing exhaust gas from a diesel engine, a pipe member for discharging exhaust gas attached to a shaft center of a first end of the main body, and a pipe member attached to an end inside the main body of the pipe member. And a particulate separating member extending toward the end of the second.
The particulate separating member includes a wire wound in a coil shape and a brush member made of aluminum foil attached to the wire. Further, it may be provided with a number of axially extending rod members attached to the outer peripheral portion of the pipe member, and an aluminum foil brush member attached to the rod members.

[0008]

FIG. 1 is an explanatory view showing the structure of a particulate removing apparatus according to the present invention. Code 10
The particulate removal device denoted by reference numeral 0 is a cylindrical main body 1.
Has 10, inlet tube 120 is mounted for introducing the exhaust gas G ₁ from the diesel engine to the outer periphery of the main body 110. The opening 122 of the introduction tube 120 is formed tangentially to the main body 110. Thus, the exhaust gas G ₁ introduced in flows tangentially inside the body 110, vortex cyclone (vortex) to form a C _1.

[0009] vortex _{C 1} collides with the wall surface 114 of the body 110 flows to the downstream side, to form a swirl _{C 2} is reflected on the inside. Large particulates PM mass contained in the exhaust gas G ₁ during this period is separated by receiving the centrifugal force or the like, leaving the inner peripheral wall 112 of the main body. This particulate PM
Collected by an appropriate collecting means.

On the axis of the main body 110, a pipe member 13 is provided.
0 is provided. The pipe member 130 is of the order to discharge the exhaust gas G ₂ became swirl C ₂ through the axial center portion of the body, the end portion 132 of the body 110,
It is provided in the middle of the axis of the main body 110. Then, the vortex separation member 150 is attached from the end 132 toward the wall surface 114 of the main body 110.

FIG. 2 shows this particulate separating member 1.
50 shows an example of a structure of a wire 15 wound in a coil shape.
2, a large number of brush members 154 made of aluminum foil are attached. This particulate separating member 15
0 has a function of preventing the passage of the particulate PM, though the gas can be circulated. Therefore, particulate matter PM is centrifuged by vortex C ₁ is, it is prevented from entering into the clean swirl C ₂ side through the central portion, thereby improving the efficiency of removal of particulates.

FIG. 3 shows a particulate separating member 150.
This shows another structure, and a number of rods 155 extending in the axial direction are attached to the outer periphery of the opening 132 of the pipe member 130. Then, a structure in which a brush member 157 made of aluminum foil is attached to each bar 155 is adopted. This particulate separation member also has a clean vortex C ₂ in which the centrifugally separated particulate PM flows through the axis.
It has a function to prevent infiltration into the body.

[0013]

As described above, the present invention prevents a particulate separated by a vortex cyclone action from entering a clean gas flow flowing through a shaft center portion, and provides a more effective particulate removing apparatus. That can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a device for removing particulates of a diesel engine according to the present invention.

FIG. 2 is an explanatory view of a particulate separating member.

FIG. 3 is an explanatory view of a particulate separating member.

FIG. 4 is an explanatory view showing a general structure of a particulate removal device using a vortex cyclone.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 particulate removal device 110 main body 120 exhaust gas introduction pipe 130 exhaust gas discharge pipe member 150 particulate separation member 152 wire 154 aluminum foil brush

Claims (3)

[Claims] An apparatus for removing particulates in exhaust gas of a diesel engine, comprising: a cylindrical main body; and a diesel engine exhaust gas tangentially mounted on an outer peripheral portion near a first end of the main body. And a pipe member for discharging exhaust gas attached to the axial center of the first end of the main body, and a second end of the main body attached to the end inside the main body of the pipe member. A particulate removal device for a diesel engine, comprising: a particulate separation member extending toward the same. 2. The particulate removing device for a diesel engine according to claim 1, wherein the particulate separating member includes a wire wound in a coil shape and a brush member made of aluminum foil attached to the wire. 3. The diesel engine according to claim 1, wherein the particulate separating member includes a plurality of axially extending rod members attached to an outer peripheral portion of the pipe member, and an aluminum foil brush member attached to the rod members. Particulate removal equipment.