JP2585757Y2 - Backwashing particulate trap 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 backwash type particulate trap apparatus.

[0002]

2. Description of the Related Art Conventionally, a trap regenerating apparatus supplies high heat directly to a trap and incinerates particulates by the heat to regenerate the trap. In some cases, the particulates trapped in the trap are removed and regenerated by the backwash air flow.

Devices for regenerating traps by backwashing air flow (Japanese Patent Application Laid-Open Nos. 62-26312, 64-77715, 1-15)
No. 9408), a backwash nozzle is provided on the downstream side of a honeycomb filter body (hereinafter, referred to as a “trap”) with its ejection end facing the trap. High-pressure gas is blown from the backwash nozzle in a direction opposite to the normal exhaust gas flow direction. Incineration with an electric heater.

[0004] Therefore, the back-washing type trap device is (1)
There is no need to supply high heat for regeneration directly to the trap, so there is no breakage of the trap due to thermal stress. (2) There is no ash accumulation in the trap, and no trap clogging occurs. It has excellent characteristics and is considered promising as a trap device.

[0005]

An invention is to provide a way in the conventional backwash type particulate trap device, in order to to satisfactorily burn the particulates, configured to supply air for a small amount of combustion promoter from the outside to the heater chamber Is suggested
However , a necessary amount of oxygen is not always distributed in the vicinity of the electric heater, and the amount of air consumption becomes excessive, so that the air supply system is not provided.
The problem that reinforcement was needed remained.

SUMMARY OF THE INVENTION An object of the present invention is to provide a backwashing type particulate trap device capable of satisfactorily burning particulates.
To provide .

[0007]

In order to achieve the above object, the present invention provides a high-pressure air for backwashing to a trap from a direction opposite to a flow direction of exhaust gas, and strips the trapped particulates in the trap. In the backwashing particulate trap device, which is blown down to a heater chamber below the trap, an electric heater is provided in a trap container containing the trap, and an outlet is provided to agitate an atmosphere near the electric heater. And a supply pipe for supplying a part of the exhaust gas on the upstream side of the trap .

[0008]

According to the above construction, the liquid is supplied from the outlet of the supply pipe.
Some of the exhaust air stirred the atmosphere near the electric heater,
Promotes the burning of the curate.

[0009]

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

[0010] As shown in FIG.
The upper end has an exhaust gas inlet 2 for introducing exhaust gas of the engine E, the other end has an exhaust gas outlet 3 for discharging the exhaust gas in the trap container 1, and the trap container 1 Is provided with a heater chamber 5 for receiving the particulates (exhaust particulates) removed from the trap 4 and incinerating them.

The trap container 1 is formed in a box shape that is long in the flow direction of the exhaust gas.
Are formed in a honeycomb shape using a porous ceramic material having good air permeability. The trap 4 is horizontally hung on the inner surface of the trap container 1 with both openings of the cell 6 turned up and down with respect to the trap container 1, and an exhaust gas introduction chamber 7 is provided above the trap container 1. In addition to partitioning, a heater chamber 5 is partitioned below the partition. Therefore, the particulates can be collected by each cell 6 and only the clean exhaust gas can be discharged from the exhaust gas outlet 3.

An electric heater 8 for oxidizing and burning the particulates is provided in the trap container 1 at a portion defining the heater chamber 5 and at the bottom where the particulates removed from the inner surface of each cell 6 of the trap 4 are collected. The exhaust gas branch pipe 9 is attached to the trap container 1 to mechanically stir the atmosphere in the heater chamber below the trap 4 and near the electric heater 8. This exhaust gas branch pipe 9 may be branched from the exhaust pipe on the engine side upstream of the trap container 1 as shown in FIG. 1, and is installed in the exhaust gas introduction chamber 7 as shown in FIGS. As shown in FIG. 4, the pipe end 11 of the engine-side exhaust pipe 10 may be directly inserted into the heater chamber 5 toward the trap 4, as shown in FIG. It may be branched from the part, but in any case, the exhaust gas branch pipe 9
Is branched from the exhaust pipe 10 on the upstream side of the trap 4
Is taken out a portion of the exhaust from its tube diameter is thinner than the pipe diameter of the exhaust pipe 10 of the engine side, the outlet 12, the atmosphere in the vicinity of the electric heater 8 is directed to the vicinity of the electric heater 8 so as to stir I have. In this case, the outlet 12 of the exhaust gas branch pipe 9 faces the vicinity of the connection between the bottom surface and the side surface of the trap container 1 on the electric heater 8 side, and the turbulent flow (vertical or horizontal) rotating near the electric heater 8 ( (Microwave). In FIG. 2, the exhaust pipe 10 on the engine side is provided so as to extend from the width direction of the trap container 1 into the exhaust gas introduction chamber 7 in the width direction. A large number of outlets 13 are formed to exhaust the exhaust gas in all directions in the exhaust gas introduction chamber 7. Of course, the pipe end (downstream end) of the exhaust pipe 10 is closed by the black plate 14.

The backwashing means for supplying high-pressure air to the trap 4 in a direction opposite to the flow direction of the exhaust gas and for flushing out the particulates trapped from the trap 4 has its jet port 15 connected to the exhaust downstream of the trap 4. Nozzle 17 attached to the exhaust pipe 16 on the muffler side so as to face the surface
A high-pressure air supply source 18 (a positive pressure tank, a compressor, etc.) for supplying high-pressure air to the nozzle 17; a high-pressure air supply pipe 19 connecting the high-pressure air supply source 18 to the nozzle 17; An electromagnetic on-off valve 20 provided on the supply pipe 19 to open and close the supply pipe 19;
On-off valve 21 provided to open and close exhaust pipe 16 downstream
At the time of trap regeneration, the on-off valve 21 is first closed,
Next, the electromagnetic on / off valve 20 is opened, the electric heater 8 is energized, and the electric heater 8 is heated to operate.
0 is closed, the on-off valve 21 is closed, and the electric heater 8 is electrically de-energized. Reference numeral 23 denotes a throttle valve provided for supplying exhaust gas to the exhaust gas branch pipe 9.

The operation of this embodiment will be described below.

During normal operation, that is, when there is no input of a trap regeneration command, the controller 22 opens the on-off valve 21, closes the electromagnetic on-off valve 20, and turns off the electric heater 8. Therefore, the trap 4 captures the particulates and discharges only the purified exhaust gas to the exhaust pipe 16 on the muffler side.

When a trap regeneration command is input, the controller 22 closes the on-off valve 21, opens the electromagnetic on-off valve 20,
The electric heater 8 is energized. Therefore, the high-pressure air of the high-pressure air supply system is ejected from the nozzle 17, and the particulates captured by the cells 6 of the trap are separated from the cells 6 and fall into the heater chamber 5. In the heater chamber 5, the atmosphere near the electric heater 8 is always mechanically disturbed by a small amount of exhaust gas introduced from the exhaust gas branch pipe 9. Therefore, the turbulence promotes the oxidative combustion of the particulates and the oxidative combustion of soot. Therefore, the particulates can be incinerated without generating soot.

As described above, according to the present invention, by stirring and disturbing the atmosphere near the electric heater 8 with a small amount of exhaust gas,
Ru can do a good incineration of the particulates.

[0018] In the case of combined off valve 21 as an exhaust brake valve, it is of course also possible to make regeneration of the particulate is carried out during exhaust braking.

[0019]

According to the present invention as apparent from the description, according to the invention described above, an excellent effect that the Ru can promote oxidative combustion of the particulates which flicked from the trap obtained.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of a backwash type particulate trap device according to the present invention.

FIG. 2 is a system diagram showing an embodiment of a backwash type particulate trap device according to the present invention.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a system diagram showing an embodiment of a backwash type particulate trap device according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 trap container 4 trap 5 heater chamber 8 electric heater 9 exhaust gas branch pipe (supply pipe) 12 outlet

Claims (1)

(57) [Scope of request for utility model registration] 1. A backwash in which high-pressure air for backwash is supplied to a trap from a direction opposite to a flow direction of exhaust gas, and particulates trapped in the trap are peeled off and blown off into a heater chamber below the trap. In the particulate trap device, an electric heater is provided in a trap container containing the trap, and an outlet is provided to agitate an atmosphere in the vicinity of the electric heater, and the trap is upstream of the trap.
A backwash type particulate trap device, wherein a supply pipe for supplying a part of the exhaust gas is mounted.