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Sealed honeycomb structrure

Inactive Publication Date: 2014-05-08
HYUNDAI MOTOR CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a sealed honeycomb structure that has improved durability and suppressed increase of pressure loss by securing a volume of a cell (inlet cell) where fluid flows and reducing the volume of the inlet side of the fluid. The structure includes reinforced cells formed at at least one corner portion of the outlet cells where the end surface of the outlet side is open and the end surface of the inlet side is sealed, or non-reinforced cells where the reinforced part is not formed. The reinforced parts formed at the outlet cells have smaller influence on pressure loss than the inlet cells, resulting in excellent mechanical strength and durability. The structure also suppresses excess increase in mass and degradation of purifying performance or fuel consumption of the internal combustion engine. The volume of the structure is not reduced by deposition of ash, and the structure improves strength without influence on the increase of pressure loss, cleaning period of ash, and replacement period of a filter after ash deposition.

Problems solved by technology

As a result, durability of the sealed honeycomb structure may be deteriorated due to deposits of ash contained in the exhaust gas.
Because mass of the sealed honeycomb structure also increases by forming the reinforcing part, forming the reinforcing part excessively may cause deterioration of performance of the sealed honeycomb structure.
Therefore, purifying performance of the exhaust gas may be deteriorated.
In this case, fuel consumption of an internal combustion engine of vehicles may be deteriorated.
In this case, durability may be improved by forming the reinforcing part but other characteristics of the filter such as the pressure loss or the purifying performance may be deteriorated.
Particularly, improvement of strength and increase of the pressure loss in the honeycomb structure are regarded to be incompatible.
Therefore, it is very difficult to obtain both of them.

Method used

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  • Sealed honeycomb structrure
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  • Sealed honeycomb structrure

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0100]Cordierite material (alumina, talc, and kaolin) is used as the ceramic material. Mass ratio of alumina, talc, and kaolin is a mass ratio obtained after burning. Ceramic mold material is obtained by mixing the ceramic material with the binder (methylcellulose) and water. The obtained ceramic mold material is kneaded by using the kneader so as to obtain the body.

[0101]After that, the molded article of the honeycomb is formed by molding the body by means of a vacuum extruder. Wall thickness is 0.305 mm, cell density is 46.5 cell / cm2, and cell pitch is 1.47 mm in the honeycomb structure obtained by burning the molded article of the honeycomb. In addition, entire shape (entire shape after burning) of the molded article of the honeycomb is cylindrical (diameter of the end surface is 143.8 mm, and a length in the extending direction of the cell is 152.4 mm). The entire shape of the molded article of the honeycomb is integrally formed (monolithic structure), and this honeycomb structu...

examples 2 to 7 and 9 to 13

and Comparative Examples 1 to 3

[0119]The sealed honeycomb structure is manufactured by the same method manufacturing Example 1 except that the wall thickness, the cell pitch and the cell where the reinforced part is formed (whether the reinforced part exists or not) in the honeycomb structure are changed as shown in Table 1, and the intersection ratio (L / T) of the inlet cell and the intersection ratio (L / T) of the outlet cell are changed as shown in Table 1. In addition, Example 13 shows that the reinforced parts are formed at a part of the outlet cells and the inlet cells. The same tests as Example 1 are done on the obtained sealed honeycomb structure. The results are shown in Table 2. In addition, the “soot mass limits (SMLs)” of Examples 1, 8, 9, 12 and 13 and Comparative Examples 1 and 4 are detected.

example 8

[0120]Carbonization silicon (SiC) is used as the ceramic material so as to manufacture the honeycomb segment, and the honeycomb structure of segment type is manufactured by bonding sixteenth honeycomb segments. In detail, SiC powder and Si metal power are mixed in a mass ratio of 80:20, and methyl cellulose and hydroxypropoxy methylcellulose as the binder, starch and water-absorbent resin as the pore-forming material, surfactant and water are mixed to the mixture of SiC powder and Si metal power such that the ceramic mold material is obtained. The obtained ceramic mold material is kneaded by using kneader such that the body is obtained.

[0121]The molded article of honeycomb is formed by molding the body by means of the vacuum extruder. The wall thickness of the molded article of the honeycomb is 305 μm, the cell density of the molded article of the honeycomb is 46.5 cell / cm2, and the cell pitch of the molded article of the honeycomb is 1.47 mm in the honeycomb structure. In addition,...

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Abstract

A sealed honeycomb structure may include porous walls dividedly forming inlet cells and outlet cells extending from an end surface of an inlet side to an end surface of an outlet side, an outlet side sealing portion, and an inlet side sealing portion, wherein at least one outlet cell is a reinforced cell, where a reinforced part for reinforcing the outlet cell is formed at at least one corner portion at which the walls on a cross-section vertical to an extending direction of the cell cross each other, and wherein the inlet cell is a non-reinforced cell where the reinforced part is not formed at all the corner portions at which the walls on the cross-section vertical to the extending direction of the cell cross each other.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a National Stage of International Patent Application No. PCT / JP2012 / 058726 filed Mar. 30, 2012 and published as WO 2012 / 133846, which claims priority to Japanese Patent Application No. 2011-078690 filed Mar. 31, 2011, the entire contents of which applications is incorporated herein for all purposes by this reference.TECHNICAL FIELD[0002]The present invention relates to a sealed honeycomb structure. More particularly, the present invention relates to a sealed honeycomb structure which can suppress increase of pressure loss and improve durability favorably.BACKGROUND[0003]Gas exhausted from internal combustion engines such as diesel engines or other combustion devices contains a large amount of particulate matter (PM) having soot as main component. Since the PM directly released into the atmosphere causes environmental pollution, a diesel particulate filter (DPF) for trapping the PM is mounted at an exhaust system of exha...

Claims

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Application Information

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IPC IPC(8): C04B38/00
CPCC04B38/0012F01N3/0222F01N2330/30B01D46/247B01D2046/2492B01D46/2474B01D46/2466F01N2330/60C04B2111/00793F01N3/2828C04B35/66C04B2235/3217C04B38/0009Y10T428/24149C04B35/10C04B2235/6021C04B2235/349C04B35/00B01D46/2486B01D46/2484B01D46/2482B01D39/20B01D46/00B01D53/00C04B38/00F01N3/022
Inventor TOYOSHIMA, TETSUOTAKAHASHI, AKIRAHAMAZAKI, YUICHISEO, JUNG MINPARK, WON-SOON
Owner HYUNDAI MOTOR CO LTD
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