KR100964552B1 - Apparatus for diesel particulate filter - Google Patents

Abstract

PURPOSE: A device for reducing smoke for a diesel vehicle is provided to maximize a regenerating effect of a filter even if the exhaust temperature of exhaust gas is low by arranging filters depending on a thermal conduction rate. CONSTITUTION: A device for reducing smoke for a diesel vehicle comprises a pre-processing filter(110) and a post-processing filter(120). The pre-processing filter has a relatively high thermal conduction rate, and the post-processing filter has a relatively low thermal conduction rate. The pre-processing filter is composed of a metal filter, and the post-processing filter is composed of a ceramic filter. The ceramic filter is a wall-flow monolith filter.

Description

Soot Reduction Device for Diesel Vehicles {Apparatus for Diesel Particulate Filter}

The present invention relates to a smoke reduction device for a diesel vehicle, and particularly, to reduce the smoke by arranging filters in the order of high thermal conductivity and being strong against thermal shock, and burning PM collected in these filters with exhaust gas heat to reduce smoke. Relates to a device.

In general, exhaust gas generated from diesel vehicles contains 20 to 30% less double hydrocarbon and carbon dioxide than gasoline engines, but contains more nitrogen compounds and fine dust (PM).

Among these, PM is a harmful element to the human body, so the exhaust gas is filtered out through the exhaust manifold of a diesel vehicle. To this end, the exhaust manifold of a diesel vehicle is provided with a smoke reduction device for filtering such harmful substances.

Such a smoke reduction device typically uses a metal filter or a ceramic filter to collect PM.

The metal filter has a high thermal conductivity, so that local heat does not occur, and thus it is resistant to thermal shock, has fast heating characteristics, and is widely used because regeneration of various filters is possible.

In addition, the ceramic filter can be used at a high temperature, and in particular, a high trapping ratio of PM contained in the exhaust gas is widely used for the smoke reduction device of diesel vehicles. In addition, the ceramic filter has the advantage of easy replacement and inspection of the filter.

However, the filter used in the conventional soot reduction device of a diesel vehicle has the following problems.

1) In the case of the metal filter and the ceramic filter, the exhaust gas has a predetermined temperature (for example, 500 to 800 ° C.) to have a regeneration function together with the filtering function.

2) However, when a diesel vehicle runs in the city, when the exhaust temperature of the exhaust gas becomes 300 ° C or lower, for example, a problem arises in that the filtering function and the regeneration function are deteriorated.

3) As such, when the filtering function, in particular the regeneration function, is degraded, the regeneration efficiency decreases after PM collection. In particular, in the case of the ceramic filter, because the regeneration is not made, there is an inconvenience that must be replaced frequently. This causes a difficulty in the maintenance of the smoke reduction device, thereby acting as a cause of increasing the management cost.

The present invention has been devised in view of the above, and is particularly provided at the end of the lamination pipe to which the respective branch pipes of the exhaust manifold are combined to sufficiently secure the regeneration temperature of the filter, and arrange the filters in the order of thermal conductivity. The purpose of the present invention is to provide a smoke reduction device for a diesel vehicle that can improve the regeneration efficiency by maximizing the regeneration effect of the filter even when the exhaust temperature of the exhaust gas is low, such as driving.

The soot reduction device for a diesel vehicle according to the present invention for achieving the above object,

In a diesel vehicle smoke reduction device mounted on a lamination pipe of an exhaust manifold of a diesel engine in which a plurality of branch pipes are laminated,

A relatively high thermal conductivity pretreatment filter unit; And a post-treatment filter portion having a relatively low thermal conductivity as compared to the pre-treatment filter portion.

The pretreatment filter unit is characterized in that it is installed in the portion connected to the branch pipe and the laminated pipe to the branch pipe.

In particular, it is preferable to use a metal filter as the first filter. As such a metal filter, a metal fiber filter can be used.

The ceramic filter may be used as the post-treatment filter unit. The ceramic filter is preferably a cordal lighter or a silicon-based porous ceramic filter. In addition, as a ceramic filter, a well-flow monolith filter may be used in which a plurality of channels formed of a plurality of ceramic porous walls are alternately clogged.

According to the present invention has the following effects.

1) Since the smoke reduction device for diesel vehicles is installed at the tip of the laminated pipe, the regeneration temperature required for PM regeneration can be obtained under any circumstances.

2) By securing the regeneration temperature, the filtering effect of the smoke reduction device can be further improved, which can extend the life of the smoke reduction device.

3) By improving the filtering effect and extending the life of the smoke reducer, not only the maintenance of the smoke reducer is easy but also the management cost can be reduced, thereby reducing the overall cost.

4) Since the PM is filtered twice and the filter is regenerated, the effect of reducing PM contained in the exhaust gas can be further improved.

5) It is possible to prevent the ceramic filter used as the post treatment filter from being damaged by the high temperature of the exhaust gas.

Hereinafter, the configuration and mounting position of the present invention with reference to the drawings in more detail.

(Mounting position)

1 is a perspective view showing the mounting position of the smoke reduction device for a diesel vehicle according to the present invention. Here, reference numeral "100" denotes a smoke reduction device according to the present invention, "1000" denotes an exhaust manifold provided in a conventional diesel engine, "1100" denotes a branch pipe, and "1200" denotes a laminated pipe, respectively.

The soot reduction apparatus 100 according to the present invention is typically installed in an exhaust manifold 1000 for discharging exhaust gas from a diesel engine. In particular, the smoke reduction device 100 is an end of the laminated pipe 1200 of the exhaust manifold 1000, ie, to obtain a temperature necessary for regeneration of each filter so as to improve the filtering function regardless of the driving conditions of the diesel engine. It is preferable to install at the distal end of the lamination pipe (1200) to be joined with the branch pipe (1100).

The installation position is described in more detail as follows. As shown in FIG. 1, the exhaust manifold 1000 generally includes a plurality of branch pipes 1100 connected to a cylinder block (not shown) to discharge exhaust gas from each cylinder constituting the multi-cylinder engine, and these branch pipes. It is made to include a laminated pipe 1200 is installed, such as a component such as a purifying device to filter the harmful substances by combining the exhaust gas introduced into the (1100). 1 shows an example of an exhaust manifold 1000 of a four-cylinder engine, and shows an example in which a lamination pipe 1200 is connected to the center thereof.

In a preferred embodiment of the present invention, the smoke reduction device 100 is, as described above, in order to directly use the exhaust gas of a high temperature state in the explosion stroke, as described above, the branch pipe 1100 and the laminated pipe 1200 is connected to the portion Phosphorus laminated tube (1200) is to be mounted on the tip.

Accordingly, the smoke reduction device 100 of the present invention can minimize the heat loss of the exhaust gas to the outside while passing through the exhaust manifold 1000, and the filtering action is particularly performed when the exhaust gas is at the highest temperature. Since the diesel vehicle can be driven at a low speed such as a city driving, it is possible to obtain a sufficient exhaust gas exhaust temperature for filter regeneration.

(Configuration)

Figure 2 is a schematic diagram for explaining the configuration of the smoke reduction device for a diesel vehicle according to the present invention.

The soot reduction apparatus 100 according to the present invention is a pretreatment filter having a different thermal conductivity in order to trap fine particles (PM) contained in exhaust gas exhausted from the exhaust manifold 1000 of the diesel engine, in particular, each branch pipe 1100. The unit 110 and the post-processing filter unit 120 is configured.

In particular, the pretreatment filter unit 110 collects fine particles primarily from the exhaust gas flowing into the lamination pipe 1200 of the exhaust manifold 1000, and thus has a relatively higher thermal conductivity than the post-treatment filter unit 120. It is preferable to use a filter made of a high material.

Since the exhaust temperature of the exhaust gas passing through the pretreatment filter unit 110 is relatively low, the post-treatment filter unit 120 may use a filter made of a material having a lower thermal conductivity than the pretreatment filter unit 110. Because there is. Therefore, it is possible to prevent the aftertreatment filter unit 120 from being damaged by the high exhaust temperature of the exhaust gas.

Thus, in a preferred embodiment of the present invention, as the pretreatment filter unit 110, it is preferable to use a metal filter having a high thermal conductivity and a low back pressure. Metal filters are known to be more resistant to thermal shocks than ceramic filters because they are more resistant to chute overload and do not locally condense due to their high thermal conductivity. In addition, the metal filter is easily regenerated and has high corrosion resistance at high temperatures. As the metal filter, a metal fiber filter, an open metal carrier, or a metal powder filter manufactured by a conventional technique may be used. 3 shows an example of an open metal carrier as an example of the metal filter according to the present invention.

In addition, in a preferred embodiment of the present invention, the post-treatment filter unit 120 preferably uses a ceramic filter having a relatively low thermal conductivity compared to the pretreatment filter unit 110. The ceramic filter has a higher collection rate (90%) than the metal filter collection rate (60%), but is known to have low thermal conductivity and difficulty in regenerating the ceramic filter. Such a ceramic filter is a well-flow hollow filter (Wall-Flow) in which a cordial writer, a silicon-based porous ceramic filter, or a plurality of channels made of a plurality of ceramic porous walls are alternately clogged one by one by a conventional technique. Monoliths Filter) can be used. Figure 4 shows a partial perspective view showing a well flow hollow filter of the commonly used ceramic filter.

In the smoke reduction device 100 according to the present invention, the PM is first collected by the pretreatment filter unit 110, and regeneration is performed by the exhaust temperature of the exhaust gas. The smoke treatment effect can be improved by secondly filtering PM contained in the exhaust gas whose exhaust temperature is lowered by the post-treatment filter unit 120 installed to the rear and using the exhaust gas.

In particular, the smoke reduction device 100 according to the present invention has a smoke reduction device 100 closest to the branch pipe 1100 even when the exhaust gas temperature is lower than that of the high speed travel, such as the city running of a diesel vehicle. Since it is installed in position, sufficient combustion temperature can be obtained. Accordingly, since the collected PM can be burned regardless of the traveling speed of the diesel vehicle, that is, the exhaust temperature, the regeneration efficiency of each filter can be increased by burning the collected PM.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will cover such modifications and variations as long as they fall within the spirit of the invention.

1 is a perspective view showing the mounting position of the smoke reduction device for a diesel vehicle according to the present invention.

Figure 2 is a schematic diagram for explaining the configuration of the smoke reduction device for a diesel vehicle according to the present invention.

3 is a perspective view showing an example of an open metal carrier as a metal filter according to the present invention.

Figure 4 is a partial perspective view showing a well flow hollow filter of a commonly used ceramic filter.

<Brief description of reference numerals for the main parts of the drawings>

100: Soot reduction device

110: pretreatment filter unit

120: post-processing filter unit

Claims (6)

delete delete delete delete delete In constructing a smoke reduction device for a diesel vehicle mounted on a lamination pipe 1200 of an exhaust manifold 1000 of a diesel engine in which a plurality of branch pipes 1100 are laminated, A relatively high thermal conductivity pretreatment filter unit 110; And a post-treatment filter unit 120 having a relatively low thermal conductivity as compared to the pre-treatment filter unit 110. The pretreatment filter unit 110 is installed at a portion where the branch pipe 1100 and the lamination pipe 1200 are connected to face the branch pipe 1100, The pretreatment filter unit 110 is composed of a metal filter, The post-treatment filter unit 120 is made of a ceramic filter, And said ceramic filter is a well-flow monolith filter formed in a form in which a plurality of channels consisting of a plurality of ceramic porous walls are alternately clogged one by one.

Images