JP2561691Y2 - Particulate collection device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a particulate collection device for collecting particulates contained in exhaust gas from a diesel engine or the like.

[0002]

2. Description of the Related Art Exhaust gas from a diesel engine contains a high concentration of exhaust fine particles (particulates) mainly composed of carbon produced by combustion, which causes pollution. Therefore, a particulate collection device a as shown in FIG. 7 is provided in an exhaust system of a vehicle equipped with a diesel engine.

[0003] This particulate trapping device a forms a casing b by enlarging a part of an exhaust pipe of an engine,
Attach particulates in exhaust gas to casing b
It is configured to house a filter c to be removed. The filter c is provided with a plurality of exhaust gas passages (not shown) formed in a vertical direction so as to communicate the upper surface and the lower surface, and allows the exhaust gas flow guided from the filter upper surface c ₁ to penetrate to the side. in which the filter side c ₂ discharged as clean gas.

On the downstream side of the filter c, there is provided a backwash nozzle d for jetting high-pressure air toward the filter c in a direction opposite to the exhaust gas flow. The high-pressure air ejected from the backwash nozzle d sweeps down the particulates attached to the filter c downward. The removed particulates are collected in a storage room e formed below the filter c and incinerated by an electric heater f.

[0005]

An invention to be Solved] However, the particulate collecting apparatus a in the above configuration, if the momentum of the exhaust gas flow, such as during high engine rotation is strong, derived from the filter top c ₁ as shown in FIG. 8 exhaust gas flows into the interior through the storage chamber e blows to the filter lower face c ₃ without penetrating laterally, it may again adhere to the filter c with particulates in the storage chamber e is stirred up. As a result, the filter c is clogged and the exhaust pressure loss increases, leading to a reduction in fuel consumption and a decrease in output.

Further, the particulates re-adhered to the filter c may self-ignite due to high-temperature exhaust gas at the time of high engine rotation, and may cause the filter c to be damaged. In addition,
Such rising of the particulates in the storage chamber e and re-adhesion to the filter c are caused not only by the exhaust gas flow but also by the backwash air from the backwash nozzle d flowing into the storage chamber e as shown by the broken line in the figure. It can also happen.

An object of the present invention, which has been made in view of the above circumstances, is to provide a particulate collection device that prevents particulates from rising in a storage room.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is to collect particulates in exhaust gas with a filter, and remove the particulates downward by high-pressure air injected in a direction opposite to the exhaust gas flow. In the particulate collection device configured to be collected in the storage chamber below the filter, a rectifying plate is provided in the storage chamber so as to be orthogonal to the inflow direction of the exhaust gas flow in order to prevent particulates from rising due to the exhaust gas flow. It is characterized by.

[0009]

According to the above construction, the exhaust gas flow flowing into the storage chamber hits a straightening plate provided orthogonal to the storage chamber.
The momentum is weakened. Therefore, the particulates in the storage room do not soar.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, a part of the exhaust pipe extending from the engine to the muffler is enlarged to form a particulate removal chamber 1. In the particulate removal chamber 1, a rectangular parallelepiped filter 2 for adhering and collecting particulates in exhaust gas is fitted.
The interior of the particulate removal chamber 1 is vertically divided into an exhaust gas introduction chamber 3 and a particulate storage chamber 4.

The filter 2 is made of a porous ceramic material having air permeability as shown in FIG. 3, and a plurality of exhaust gases formed in a vertical direction so as to communicate the exhaust gas introduction chamber 3 and the particulate storage chamber 4. A passage 5 is provided (wall flow type). The upper surface of the filter 2 faces the exhaust gas introduction chamber 3, the lower surface faces the particulate storage chamber 4, and both side surfaces communicate with the muffler-side exhaust pipe via the Y-shaped pipe 6 as shown in FIG. 4. .

Therefore, the exhaust gas from the engine is guided from the exhaust gas introduction chamber 3 into the exhaust gas passage 5 of the filter 2, penetrates the side of the passage 5, and is discharged to the muffler side exhaust pipe through the Y-shaped pipe 6. (See FIG. 4). At this time, in the exhaust gas, the particulates in the exhaust gas are attached and collected on the inner peripheral surface of the exhaust gas passage 5 of the filter 2, and are discharged as a clean gas to the muffler side exhaust pipe.

The particulates adhered and collected on the filter 2 are separated and dropped by high-pressure air jetted from a backwash nozzle 7 provided in a Y-tube 6 on the downstream side of the filter 2. These backwash nozzles 7 are provided with an electromagnetic on-off valve 8.
Is connected to an air tank 9 to which high-pressure air is supplied by a compressor. The electromagnetic on-off valve 8 is
Each is connected to the controller 10 and is controlled to open and close. Further, at the time of such backwashing, the shut valve 11 provided on the downstream side of the backwash nozzle 7 closes the inside of the Y-tube 6.

As shown in FIG. 3, the filter 2 is divided right and left by a partition plate 12 along the flow direction of the exhaust gas, so that the filter 2 can be backwashed alternately. That is, the backwash nozzle 7 and the shut valve 11 provided on the left and right of the Y-tube 6 are alternately operated left and right,
The filter 2 is washed by half. Thereby, the filter 2 can be washed without interrupting the operation of the engine.

The particulates separated and dropped by the high-pressure air from the backwash nozzle 7 are stored in the particulate storage chamber 4 below the filter 2. The storage chamber 4 is formed in a slope shape that gradually becomes deeper along the longitudinal direction of the filter 2, and an electric heater 13 for incinerating the particulates P is provided at the deepest part. Therefore, the particulates P blown from the filter 2 into the storage room 4 are guided to the deepest portion along the slope and incinerated by the electric heater 13. In addition, a discharge port for collectively discharging the particulates P in the chamber 4 to the outside may be provided in the deepest part of the storage chamber 4.

The feature of this embodiment is that a plurality of rectifying plates 14 are provided at predetermined intervals in the longitudinal direction of the filter 2 in the particulate storage chamber 4 as shown in FIG. is there. As shown in FIG. 2, these rectifying plates 14 are provided perpendicular to the inflow direction of the exhaust gas flow that penetrates through the inside of the filter 2 and blows down to the lower surface of the filter 2. These rectifying plates 14 are supported on the side surface of the storage room 4 or the lower surface of the filter 2, and their plate lengths are gradually increased in accordance with the slope.

The operation of this embodiment having the above configuration will be described.

During normal operation, the exhaust gas discharged from the engine is guided into the filter 2 from the upper surface of the filter 2 as shown in FIG. Is discharged. At this time, in the exhaust gas, particulates in the exhaust gas are attached and collected on the filter 2,
It becomes a clean gas and is discharged to the muffler side exhaust pipe. The particulate attached and collected on the filter 2 is a Y-tube 6
It is separated and dropped by the high-pressure air injected from the backwash nozzle 7 provided therein, and is stored in the storage room 4 below the filter 2.

When the exhaust gas flow is strong such as when the engine is running at a high speed, as shown in FIG. In this case, the exhaust gas flowing into the storage chamber 4 from the lower surface of the filter 2 may flow through the lower surface of the filter 2.
And its momentum is weakened.

That is, as shown in FIG.
Large convection (circulation) of the exhaust gas flow generated in the storage chamber 4 when there is no 4 is obstructed by the rectifying plate 14 and collapsed. Therefore, the particulates P in the storage room 4 do not soar. Therefore, the soaked particulate P does not adhere to the filter 2 again. As a result, excessive collection of the filter 2 is prevented, pressure loss increase, fuel consumption decrease, output decrease, and the like can be prevented beforehand, and at the same time, erosion of the filter 2 at the time of self-ignition can be prevented.

Also, when the filter 2 is backwashed, convection may occur in the storage chamber 4 as shown by a broken line in FIG. However, since they are arranged orthogonally, convection during backwashing can also be suppressed. Therefore, the particulates P in the storage chamber 4 do not soar during backwashing and do not adhere to the filter 2 again.

FIG. 5 shows a modified embodiment. As shown, in this modification, the direction of introduction of exhaust gas into the filter 2 is deflected by 90 degrees compared to the previous embodiment. That is, the exhaust pipe 15 connected to the exhaust gas introduction chamber is attached so as to be deflected by 90 degrees. Therefore, when the exhaust gas flow is strong, the flow direction of the exhaust gas flow that passes through the filter 2 and flows into the storage chamber 4 is in the left-right direction of the filter 2 as shown in FIG. Therefore, the current plate 14 provided in the storage room 4 is
The filters 2 are arranged at appropriate intervals in the left-right direction.

According to this configuration, the convection of the exhaust gas flow generated in the storage chamber 4 is suppressed by the rectifying plate 14 as in the previous embodiment. Therefore, the particulate P is prevented from rising, and re-adhesion to the filter 2 is prevented.

[0025]

As described above, according to the present invention, the current plate prevents the particulates in the storage chamber from rising, so that it is possible to prevent the raised particulates from re-adhering to the filter. Therefore, excessive collection of the filter is prevented, pressure loss increase, fuel consumption decrease, output decrease, etc. can be prevented beforehand, and further, filter erosion at the time of self-ignition can be prevented.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a particulate collection device according to an embodiment of the present invention.

FIGS. 2A and 2B are diagrams showing a flow of an exhaust gas flow passing through a filter of the particulate collection device, wherein FIG. 2A shows a case where there is no current plate, and FIG. 2B shows a case where there is a current plate.

FIG. 3 is a perspective view showing a main part of the particulate collection device.

FIG. 4 is a plan view showing the whole of the particulate trapping device.

FIGS. 5A and 5B are explanatory views of a particulate collection device according to a modified embodiment, in which FIG. 5A is a front sectional view and FIG. 5B is a side sectional view.

6A and 6B are diagrams showing a flow of an exhaust gas flow passing through a filter of the particulate collection device, wherein FIG. 6A shows a case where there is no current plate, and FIG. 6B shows a case where there is a current plate.

FIG. 7 is a side cross-sectional view of a particulate collection device showing a conventional example.

FIG. 8 is a diagram showing a state of an exhaust gas flow and a backwash air that pass through a filter and flow into a storage chamber when the engine is running at a high speed or during a backwash.

[Explanation of symbols]

 2 Filter 4 Storage room 7 Backwash nozzle from which high-pressure air is injected 14 Straightening plate P Particulate

Claims (1)

(57) [Scope of request for utility model registration] 1. A particulate collection device in which particulate matter in exhaust gas is collected by a filter, and the particulate matter is blown downward by high-pressure air injected in a direction opposite to the exhaust gas flow, and collected in a storage chamber below the filter. In the device,
A particulate collection device, characterized in that a rectifying plate is provided in the storage chamber so as to be perpendicular to an inflow direction of the exhaust gas flow in order to prevent particulates from rising due to the exhaust gas flow.