JPH066185Y2 - Particulate trap filter regeneration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a regenerating device of a filter device for purifying exhaust gas of an internal combustion engine of a vehicle or the like.

[Prior Art] In an internal combustion engine such as a vehicle, a filter device for removing harmful substances such as carbon and hydrocarbon contained in exhaust gas is used. There is a particulate trap filter that collects carbon particles and the like using a kind of porous filter as this filter. A filter of this type causes clogging when used, and in such a case, there is known a device for regenerating the filter by heating the filter with a burner or the like to incinerate the trapped particles in the filter.

The present applicant has already proposed this type of filter regenerating device as Japanese Utility Model Laid-Open No. 61-128323.

The particulate trap filter generally has a cylindrical shape, and when a flame or the like is sent to the filter, the temperature of the central portion of the filter easily rises and becomes higher than the temperature of the outer peripheral portion. Therefore, even if the temperature at the center of the filter becomes high enough to be damaged, the temperature of the outer periphery of the filter may not rise to the temperature required for filter regeneration.

[Object of the Invention] Therefore, an object of the present invention is to provide a filter regenerator capable of equalizing the temperature of the filter during the regenerating of the filter.

According to the present invention, a filter case containing a particulate trap filter, exhaust gas inlets and outlets formed at both ends of the filter case, and an exhaust gas inlet side of the filter case are provided. In a regenerating device of a particulate trap filter having a heating device composed of a burner equipped with a fuel injector and a secondary air injection device, the flow rate is directed toward the outer peripheral portion immediately before the particulate trap filter of the filter case. A guide plate having a large perforation is provided.

[Advantageous Effects of the Invention] With the present invention, the flame flow from the heating device is sent to the outer peripheral portion of the filter in large quantities by the guide plate, and the particulate matter in the filter is incinerated. At this time, each part of the filter is heated almost uniformly, and uniform regeneration can be achieved. Further, since the exhaust gas is sufficiently mixed by the presence of the guide plate before entering the filter and is introduced into the filter with a uniform temperature distribution, the efficiency of collecting the particulates can be improved.

[Preferred Embodiment] In carrying out the present invention, the guide plate may be provided with a hole having a larger diameter toward the outer periphery, and the hole of the guide plate may be oriented in the outer peripheral direction.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view showing the entire filter regenerating apparatus of the present invention, in which a particulate trap filter 1 is mounted in a cylindrical filter case 2. An inlet 3 for introducing engine exhaust gas is provided on one side of the filter case 2, and an exhaust gas outlet 4 is formed on the other side of the case.

An inner cylinder portion 5 is provided on the inlet side of the filter case 2 on the axis of the case, and an end portion of the inner cylinder portion 5 is generally designated by reference numeral 10.
The heating device shown by is attached. This heating device is provided with a burner having an injection 11 of fuel such as light oil and a jetting device 12 of secondary air. The fuel injector 11 jets light oil and has a glow plug (not shown) provided at its tip. It is ignited by and the flame is ejected to the filter side. The secondary air injection device 12 includes a blower and injects outside air into the inner cylinder 5.

A temperature sensor 15 is provided adjacent to the burner, and similarly, a temperature sensor 16 and an exhaust pressure sensor 17 are also arranged on the upstream side of the particulate trap filter 1. Information from each of these sensors is sent to the control circuit 20.
Information from the engine rotation sensor 21 and the engine load sensor 22 is also sent to this control device. The output of the control circuit 20 is sent to the fuel injector 11 of the heating device 10 and the secondary air injection device 12 to control these devices.

In the present invention, in the filter regenerating apparatus having this kind of basic structure, the guide plate 30 is provided immediately upstream of the filter 1. An embodiment of this guide plate 30 is shown in detail in FIGS. 2 and 3. Second
As shown in the figure, a large number of holes 32 are provided in the disc-shaped guide plate, and the diameter of the holes 32 is small in the central portion and increases in diameter toward the outer peripheral portion. Further, as shown in FIG. 3, these holes 32 may be provided so that their axes are directed to the outer circumference.

As described above, the device of the present invention is provided with the guide plate that causes a large flow toward the outer peripheral portion immediately before the filter in the filter case, so that the exhaust gas of the engine collides with the guide plate and the flow is disturbed. Since the temperature distribution in the exhaust gas flow is made uniform and is introduced into the particulate trap filter 1 in that state, the efficiency of collecting harmful substances such as carbon and hydrocarbons contained in the exhaust gas is improved. To do. Next, when the control circuit 20 detects that the particulate trap filter 1 is clogged by the information of each sensor, the heating device 10 is activated to inject the flame flow. This flame flow hits the guide plate 30, and a large amount of flame flow is sent to the outer peripheral portion of the filter 1.

Particulate trap filter 1 by this flame
The carbon and hydrocarbons trapped inside are incinerated and the filter is regenerated. During the regeneration process of this filter, a small amount of flame is sent to the center of the filter where the temperature easily rises, and a large amount of flame is sent to the periphery of the filter where the temperature hardly rises. Is uniformized and complete filter regeneration can be achieved.

[Summary] As described above, the present invention relates to a regenerating apparatus for a particulate trap filter having a flame-type heating device.
A guide plate is installed in front of the filter that increases the flow rate toward the outer circumference, so the filter temperature during filter regeneration can be made uniform, and the exhaust gas is also agitated before introducing the filter to make the temperature uniform. Therefore, the collection efficiency of harmful substances and the regeneration efficiency of the filter are both improved.

[Brief description of drawings]

1 is an overall schematic view showing an embodiment of the present invention, FIG. 2 is a front view of a guide plate, and FIG. 3 is a sectional view of FIG. 1 ... Particulate trap filter, 2 ... Filter case, 3 ... Exhaust gas inlet, 4 ... Exhaust gas outlet, 5 ...
Inner cylinder, 10 ... Heating device, 11 ... Fuel injector, 12
... secondary air ejection device, 15 ... temperature sensor, 16 ... temperature sensor, 17 ... exhaust pressure sensor, 20 ... control circuit, 21 ... rotation sensor, 22 ... engine load sensor, 30 ... guide plate, 3
2 ... hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keiichi Niimura, 1-chome, Ichichome, Ageo-shi, Saitama, Nissan Diesel Industry Co., Ltd. (72) Shuichi Nakamura 1-chome, 1-chome, Ageo, Saitama Prefecture Co., Ltd. (72) Inventor, Kitamura Sentence, Io-chome, 1-chome, Ageo City, Saitama Prefecture Nissan Diesel Industry Co., Ltd. (56) References JP 54-12029 (JP, A) JP 63-285217 (JP) , A) Actual opening 61-108820 (JP, U) Actual opening 62-141615 (JP, U) Actual opening 62-176418 (JP, U) Actual opening 64-15713 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A filter case containing a particulate trap filter, exhaust gas inlets and outlets formed at both ends of the filter case, and a fuel injector provided on the exhaust gas inlet side of the filter case. In a regenerating device of a particulate trap filter having a heating device composed of a burner and a secondary air injection device, a porous body having a large flow rate toward the outer peripheral portion is provided just before the particulate trap filter of the filter case. A regeneration device for a particulate trap filter, which is provided with a formed guide plate.