JPH06173649A - Diesel particulate filter - Google Patents

Abstract

PURPOSE:To facilitate manufacture of filter elements to scavenge and incinerate particle-like materials in exhaust gas, and simplify a filter structure by combining these with each other. CONSTITUTION:Urethane foam plates are impregnated with electrically conductive ceramics, and porous filter plates 2 are formed by sintering, and respective ones are laminated at intervals on each other by using these filter plates 2, and the end parts are connected successively in series to each other by connecting materials 22, and the tail ends are connected to heating terminals 30 and 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diesel particulate filter for collecting particulate matter in exhaust gas of a diesel engine.

[0002]

2. Description of the Related Art Since a diesel engine burns in a region where the excess air ratio is large, it emits a small amount of carbon monoxide and hydrocarbons, but emits a large amount of nitrogen oxides and particulate matter. Has become a challenge for diesel engines.

In order to collect and process the discharged particulate matter, a particulate filter attached to the exhaust passage is used.

[0004]

As a filter of this kind, for example, a filter having a porous honeycomb structure made of cordierite collects carbon, and when it is clogged, the filter is switched to operate another filter,
There are those that burn the clogged carbon and regenerate it,
There is a problem that the structure is complicated because the filter is switched to incinerate the carbon, and the cordierite material is damaged due to overheating during the incineration.

The present invention has been made in view of the above conventional problems, and its purpose is to simplify the structure of a filter for collecting discharged particulate matter, facilitate electricity supply, and incinerate carbon. It is intended to provide a diesel particulate filter that can be used.

[0006]

In order to achieve the above object, according to the present invention, in a diesel particulate filter which is provided in an exhaust system of a diesel engine and collects exhausted particulate matter, a gap is provided. While connecting the left and right ends of the conductive filter plates stacked apart from each other in sequence by connecting the adjacent filter plates with a connecting material,
There is provided a diesel particulate filter in which a filter plate is formed in a wall flow type that allows exhaust gas to flow into the gap, and the deposits are incinerated by energizing the filter plate.

[0007]

[Function] A urethane home plate is impregnated with conductive ceramics, and a porous filter plate formed by sintering this is used to form a wall-flow type filter by laminating a gap between them. Since the filter plate is connected and connected in series by the connecting member, the filter plate can be easily manufactured, and the electricity can be easily supplied to simplify the structure of the filter.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the diesel particulate filter of the present invention, and FIG. 2 is an explanatory view showing the connection of the filter element.

In these drawings, 1 is a housing 1
Particulate filter (filter) contained in 1
Thus, both ends of the housing 11 are squeezed so that the exhaust flow inlet 1
2 and an outlet 13 are formed.

Reference numeral 2 is a filter plate made of a porous ceramic having conductivity, and a plurality of filter plates are laminated with a predetermined gap therebetween, and both side faces of each filter plate 2 parallel to the exhaust flow are airtight. A ceramic plate is applied and covered with a heat insulating material, and heat insulating material 2 is provided on the upper and lower surfaces of the laminated body.
1 is attached and is housed in the central portion of the housing 11.

The above-mentioned filter plate 2 is formed by impregnating an electrically conductive ceramic into a urethane home plate or the like, and sintering this molded product to make it porous. A muddy powder of metal powder and ceramic powder is used. If it is impregnated, it is easy to form a composite, and the stability during energization can be secured. Alternatively, the filter plate 2 may be a porous one formed by sintering only granular metal powder of nickel or chromium alloy.

The upstream gaps between the adjacent filter plates 2 housed in the housing 11 and the adjacent plates alternately serve as inlets for the exhaust flow, and the other gaps are elongated metal plates or conductive airtight ceramic connecting members 22. The downstream end of the gap, which is closed by, and has an opening in the upstream direction, has its flow path closed by a sealing material 23 made of the same material as the connecting material 22. Therefore, since each of the stacked filter plates 2 is electrically connected in the upstream direction by the conductive connecting material 22 and in the downstream direction by the sealing plate 23 made of the same material, all the filter plates 2 are connected in series. Will be done.

Reference numeral 30 denotes an upper heating terminal, 31 denotes a lower heating terminal, which are electrically connected to the upper filter plate and the lower filter plate, respectively, which are laminated, and these heating terminals 30 and 31 are connected. When electric power is supplied from a predetermined power source, all the filter plates 2 connected in series generate heat due to their electric resistance.

When forming the exhaust flow passage and the electric passage in such a filter element, the connecting material in the upstream direction and the sealing material in the downstream direction, both of which are perpendicular to the flow passage, are formed into a large flat plate, and the filter plates are laminated. The flow path and the electric path can be easily constructed by mounting the same on all the end faces in the upstream and downstream directions and cutting off the connecting material and the sealing material in predetermined portions from the outside.

Explaining the operation of this embodiment having the above-mentioned structure, the exhaust gas introduced into the inlet 12 of the housing 11 flows in through the gap of the laminated filter plates 2 and the downstream of the gap. Is closed by the sealing material 23, the gas component flows downstream through the porous material of the filter plate 2 and is discharged from the outlet 13.

During this period, the particulate matter in the exhaust gas is collected by the filter plate 2 and stays on the wall surface thereof.

Next, when the upper and lower heating terminals 30 and 31 of the housing 11 are energized from a predetermined power source, all the filter plates 2 connected in series by the connecting member 23 rapidly generate heat, and the amount of heat causes the suspension. The accumulated deposit will be incinerated.

[0019]

According to the present invention as in the above-described embodiments, a wall flow type filter is formed by impregnating a urethane home plate with conductive ceramics and sintering it to form a porous filter plate. Since the filter plates are electrically connected in series and the deposits are incinerated by energization, the filter plates can be easily manufactured, and the filter elements connected in series do not have to be replaced when the deposits are clogged. There is an effect that the incineration process can be easily performed by energizing the plate.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the connection of the filter element of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Particulate filter 2 ... Filter plate 21 ... Thermal insulation material 22 ... Connection material 30, 31 ... Heating terminal

Claims (3)

[Claims] 1. A diesel particulate filter installed in an exhaust system of a diesel engine to collect exhausted particulate matter. In a diesel particulate filter, left and right ends of electrically conductive filter plates laminated with a gap therebetween are adjacent to each other. Characterized in that a filter plate is formed in a wall flow type that allows exhaust gas to flow into the gap, and the collected deposits are incinerated by energizing the filter plate while being connected in series by a connecting material and a serial connection. And diesel particulate filter. 2. The diesel particulate filter according to claim 1, wherein the filter plate is formed by impregnating a urethane home plate with conductive ceramics and sintering the same. 3. The diesel particulate filter according to claim 1, wherein the filter plate is formed by sintering granular powder of nickel-chromium alloy to make it porous.