摘要:
There is provided a method for manufacturing cell structures having a plurality of cells divided by porous partition walls and extending from one end face to the other end face to function as fluid passages. Dry mass of each of a plurality of honeycomb-shaped cell structure precursors is measured, and at least one end face of each of the cell structure precursors is subjected to machining according to the dry mass measured to obtain a plurality of cell structures having a uniform dry mass. The method can suppress excessive use of a catalyst component to reduce production costs and uniformalize the amount of a catalyst component carried on the structures.
摘要:
There is disclosed a plugged honeycomb structure 1 having: partition walls 2 arranged in such a manner as to form a plurality of cells 3 extending from one end face 42 to the other end face 44 through an axial direction; an outer peripheral wall 7 which surrounds an outer periphery of the partition wall 2; and plugging portions 4a, 4b disposed in such a manner as to plug the cell 3 in either end face 42, 44. In the plugged honeycomb structure 1, at least some of plugging portions 4a arranged in at least the vicinity of the outer peripheral wall protrude from the end face 42 or 44. Alternatively, there are provided a plugged honeycomb structure 1 in which a tip of the protruding portion 4a is substantially flat or has a moderate curved face, and a method of manufacturing the structure. The plugged honeycomb structure 1 does not easily break, is capable of enhancing durability, and is preferably usable in a filter such as a diesel particulate filter (DPF).
摘要:
There is provided a honeycomb structure having a consecutive cell structure and capable of reconciling reduction in pressure loss and improvement in purification ability and a method for manufacturing the honeycomb structure. The honeycomb structure 1 has a plurality of partition walls 2 partitioning a plurality of cells 3 extending in an axial direction. At least a part of continuous partition walls 2 has a curved shape protruding toward outside from the center 4 of a cross-section perpendicular to the axial direction or a curved shape protruding toward the center of the cross-section from outside.
摘要:
There is provided a method for manufacturing cell structures having a plurality of cells divided by porous partition walls and extending from one end face to the other end face to function as fluid passages. Dry mass of each of a plurality of honeycomb-shaped cell structure precursors is measured, and at least one end face of each of the cell structure precursors is subjected to machining according to the dry mass measured to obtain a plurality of cell structures having a uniform dry mass. The method can suppress excessive use of a catalyst component to reduce production costs and uniformalize the amount of a catalyst component carried on the structures.
摘要:
A honeycomb structural body having a plurality of cells and partition walls defining the cells, wherein a cross-section of each partition wall perpendicular to the flow direction of a fluid to be permeated has a grille shape of which gratings cross in x axis and Y axis directions, and there are at least two kinds of cells different in their cross-sectional areas perpendicular to the flow direction of a fluid to be filtered by virtue of changing intervals of the partition walls in the x axis direction and/or intervals of the partition walls in the y axis direction, as predetermined. Each cell is defined by two parallel partition walls having the same length and another two parallel partition walls having the same length crossing each other and being formed at the predetermined intervals. A die usable for forming such a honeycomb structure is also disclosed.
摘要:
A method for manufacturing a formed honeycomb structure in an efficient manner which comprises the steps of: charging a material for forming a honeycomb structure 5 into a passage 22 for preform material for a honeycomb structure whose one end portion is provided with die 3 for forming a formed honeycomb structure; and extruding the charged preform material for a honeycomb structure 5 from the die 3 to form a formed honeycomb structure 10 while passing it through the passage, wherein a screen 4 for filtering foreign matters included in the preform material for a honeycomb structure 5 is disposed in the vicinity of the die 3, and wherein an operation for reduction of frictional resistances between an inner face of the passage 22 for preform material for a honeycomb structure and the preform material for a honeycomb structure 5 which passes the passage is employed.
摘要:
There is provided a plugged honeycomb structure 1 including: partition walls 2 disposed so as to form a plurality of cells 3 extending from one end face 42 to the other end face 44 in the axial direction, and plugged portions 4 disposed so as to plug the cells 3 at one of the end faces, and a production method thereof. In this honeycomb structure 1, the plugged portions 4 and partition walls surrounding the plugged portions are unitarily formed. The production method includes a forming step, a plugging step for filling a plugging material, and a firing step. The plugging material contains solid particles capable of unitarily joining with at least one kind of solid particles contained in a forming raw material in a firing step. A ratio of a dimensional change (%) upon forming the partition walls out of the partition wall-forming material to a dimensional change (%) upon forming the plugged portions out of the plugging material is controlled to be within the range of 0.7% to 1.3 in the firing step. There is provided a plugged honeycomb structure having further improved strength, adhesion, and thermal shock resistance between partition walls and plugged portions and a production method thereof.
摘要:
A honeycomb structure in which a plurality of through-holes 3 extending in the axial direction are formed by a plurality of partition walls 1 and 2, wherein the plurality of partition walls 1 and 2 are constituted by a plurality of partition walls having different thicknesses and, of the plurality of partition walls having different thicknesses, those partition walls 2 having a thickness larger than the average thickness of all partition walls are provided at a higher proportion in a particular portion of the honeycomb structure whole portion having partition walls than in other portion. This honeycomb structure, and a honeycomb filter and a converter system both using the honeycomb structure satisfy recent years' requirements of improvement in warm-up property connected with purification ability and reduction in harmful substance emitted right after engine start, and yet have a sufficient mechanical strength to external pressure, a high erosion resistance and a high thermal shock resistance.
摘要:
A ceramic honeycomb catalytic converter having a novel canning structure capable of stably retaining a thin-walled ceramic honeycomb catalyst within a metal casing for a long period. A retainer member in the form of a ceramic fiber mat is disposed between an inner peripheral surface of the casing and an outer peripheral surface of the honeycomb catalyst, in a compressed state to generate a surface pressure for retaining the honeycomb catalyst in place. The ceramic fiber mat is composed of heat resistant and non-intumescent ceramic fibers, and has a compression characteristic which is substantially free from a significant increase or decrease over an operative temperature range of the catalytic converter. The casing may be provided with at least one locking member for locking the ceramic fiber mat in a flow direction of exhaust gas passed through the honeycomb catalyst.
摘要:
An exhaust gas recirculation device for an internal combustion engine has a filter for trapping particulates in a recirculation gas, which is arranged in a recirculation gas route, and a device for generating a reverse air flow in which a pure gas flow for the reverse air flow passing through said filter in a reverse direction with respect to a recirculation gas flowing direction in the filter is generated. In the exhaust gas circulation device, the trapped gases are discharged out of the filter by the reverse air flow and are not returned into the internal combustion engine due to an engine exhaust pressure.