摘要:
The honeycomb structured body of the present invention is a pillar-shaped honeycomb structured body comprising a large number of through holes that are longitudinally placed in parallel with one another with a partition wall therebetween, wherein the large number of through holes include a group of large-capacity through holes being sealed at one side of an end portion of the honeycomb structured body, so that the sum of areas on a cross section perpendicular to the longitudinal direction is made relatively larger, and a group of small-capacity through holes being sealed at the other side of the end portion of the honeycomb structured body, so that the sum of areas on the cross section is made relatively smaller, and when an aperture rate which is a ratio at which the area of the group of large-capacity through holes accounts for the total area of the end face on the inlet-side of the honeycomb structured body is represented by α (%), and a difference in thickness on the cross section between: the portion of the partition wall that separates adjacently located through holes constituting the group of large-capacity through holes from each other; and the portion of the partition wall that separates adjacently located through holes, one of which constituting the group of large-capacity through holes and the other of which constituting the group of small-capacity through holes, is represented by β (mm), relationships indicated by the following inequalities (1) and (2) are satisfied: 0.0022α+0.0329≦β≦0.0071α+0.2553 (1), and about 35≦α≦about 60 (2).
摘要:
A honeycomb structured body of the present invention is a pillar-shaped honeycomb structured body comprising a large number of through holes that are longitudinally placed in parallel with one another with a partition wall therebetween, wherein the large number of through holes include a group of large-capacity through holes being sealed at one of end portions so that the sum of areas on a cross section perpendicular to the longitudinal direction is made relatively larger, and a group of small-capacity through holes being sealed at the other end portion so that the sum of areas on the cross section is made relatively smaller, and the partition wall that separates the adjacent through holes constituting the group of large-capacity through holes is provided with a selective catalyst supporting portion used for selectively supporting a catalyst.
摘要:
A pillar-shaped honeycomb structured body comprises large-capacity through holes and small-capacity through holes, a first partition wall between two adjacent large-capacity through holes, a second partition wall between a large-capacity through holes and a small-capacity through holes adjacent to each other. Each of the plurality of large-capacity through holes and small-capacity through holes extends from a first end face to a second end face. An aperture rate α (%) is a ratio between the sum of the area of the large-capacity through holes at the second end face and the area of the second end face. The difference in the thickness of the first partition wall and the second partition wall is β (mm). The relationship between α and β satisfies the following inequalities (1) and (2): 0.0022α+0.0329≦β≦0.0071α+0.2553 (1), and about 35≦α≦about 60(2).
摘要:
A honeycomb structured body of the present invention is a pillar-shaped honeycomb structured body comprising a large number of through holes that are longitudinally placed in parallel with one another with a partition wall therebetween, wherein the large number of through holes include a group of large-capacity through holes being sealed at one of end portions so that the sum of areas on a cross section perpendicular to the longitudinal direction is made relatively larger, and a group of small-capacity through holes being sealed at the other end portion so that the sum of areas on the cross section is made relatively smaller, and the partition wall that separates the adjacent through holes constituting the group of large-capacity through holes is provided with a selective catalyst supporting portion used for selectively supporting a catalyst.
摘要:
A honeycomb structural body comprises one or plural pillar-shaped porous ceramic members in which many through-holes are arranged side by side in a longitudinal direction through partition walls and either one end portions of these through-holes are sealed. The partition wall forming the structural body has a surface roughness of not less than 10 μm as a maximum roughness Rz defined in JIS B0601-2001 and an average pore size of 5-100 μm in a pore distribution measured by a mercury pressure method, and satisfies the following relationship: A≧90−B/20 or A≦100−B/20 when a ratio pores having a pore size of 0.9-1.1 times the average pore size to total pore volume is A (%) and a thickness of the partition wall is B (μm), and there is proposed an effective honeycomb structural body having excellent pressure loss and catching efficiency and a high catalyst reactivity.
摘要:
A honeycomb structural body comprises one or plural pillar-shaped porous ceramic members in which many through-holes are arranged side by side in a longitudinal direction through partition walls and either one end portions of these through-holes are sealed.The partition wall forming the structural body has a surface roughness of not less than 10 μm as a maximum roughness Rz defined in JIS B0601-2001 and an average pore size of 5-100 μm in a pore distribution measured by a mercury pressure method, and satisfies the following relationship: A≧90−B/20 or A≦100−B/20 when a ratio pores having a pore size of 0.9-1.1 times the average pore size to total pore volume is A (%) and a thickness of the partition wall is B (μm), and there is proposed an effective honeycomb structural body having excellent pressure loss and catching efficiency and a high catalyst reactivity.
摘要:
A honeycomb filter for purifying exhaust gases, which makes it possible to alleviate a thermal stress generated due to occurrence of a local temperature change, is less likely to generate cracks, and is excellent in strength and durability. The honeycomb filter has a structure in which a plurality of column-shaped porous ceramic members, each having a number of through holes that are placed side by side in the length direction with a partition wall interposed therebetween, are combined with one another through adhesive layers so that the partition wall that separates the through holes are allowed to function as a filter for collecting particulates. A thermal expansion coefficient αL of the adhesive layer and a thermal expansion coefficient αF of the porous ceramic member is as follows: 0.01
摘要:
A sewing machine zigzag pattern changing device comprises: a cam drive shaft (11) supported in a sewing machine frame in such a manner that it can be rotated deceleratingly in linking with a sewing machine main shaft; a needle swing cam (13) supported on the cam drive shaft and including at least two cams which are spaced apart from each other in the axial direction of the needle swing cam and respectively correspond to different needle swing patterns; a needle swing drive shaft (20) disposed in parallel to the cam drive shaft, supported in the sewing machine frame in such a manner that it is capable of swing motion about the axis thereof, and connected to a needle mechanism so that it can move a needle in a direction at right angles to a cloth feeding direction due to the above swing motion; a cam body (50) including a pair of contact bodies separately engageable with and removable from the two cams, capable of transmitting the swing motion of the contact body due to one of the needle swing cams to be engaged to the needle swing drive shaft, and supported on the needle swing drive shaft in such a manner that it can be moved in the axial direction of the needle swing drive shaft; switch means (59) connected to the cam body for moving the cam body in the axial direction of the needle swing drive shaft to one position where one contact member can be engaged with one cam groove as well as to another position where the other contact member can be engaged with the other cam groove; a guide member disposed in parallel to the axial direction of the needle swing drive shaft; and, a member to be guided engageable with the guide member and relatively movable in the axial direction of the needle swing drive shaft.
摘要:
An apparatus for measuring a radiation characteristic of a laser diode. An AC signal and a step-like DC voltage are applied to the laser diode and the radiant power output thereof is received by a photodiode having an output to which a first amplifier, a transformer, a capacitor and an AC amplifier for extracting the AC signal. The apparatus further comprises a first switch connected between the input of the first amplifier and the capacitor, and a second switch connected between both ends of the transformer. Every time the step-like voltage is stepped up, the first and second switches are closed for a short time as compared with the duration of a step period to protect the measurement from the influence of the change in the DC voltage.
摘要:
A honeycomb filter includes a ceramic laminated body including columnar porous ceramic members and an adhesive layer combining the columnar porous ceramic members with one another. The columnar porous ceramic members each have a partition wall and through holes, the through holes extend in parallel with one another in a length direction of the columnar porous ceramic members, the partition wall separates the through holes and filters particulates in an exhaust gas, and the adhesive layer includes an inorganic binder, an inorganic fiber, inorganic particles and an inorganic balloon.