400results about How to "Low pressure loss" patented technology

A cyclone dust-collecting apparatus to separate dust from air drawn in through a suction port body of a vacuum cleaner using a centrifugal force and to collect the separated dust is provided. The cyclone dust-collecting apparatus includes a primary cyclone unit to separate dust from air drawn in through the suction port body; a secondary cyclone unit disposed inside the primary cyclone unit to separate dust from air discharged from the primary cyclone unit; and a tertiary cyclone unit disposed above the primary cyclone unit at an angle different from the primary and secondary cyclone units.

An object of the present invention is to provide a filter that makes it possible to suppress the initial pressure loss and, also, to reduce the rising rate of the pressure loss that increases as particulates accumulate; therefore, the pressure loss at the time when a prescribed amount of particulates have been collected becomes lower, and the pressure loss from the viewpoint of the period up to the recovery as a whole also becomes lower. The present invention provides a filter, which is a column shaped filter having a honeycomb structure, including a number of through holes that are placed in parallel with one another in the length direction with wall portion interposed therebetween, wherein the through holes are constituted by two types of through holes, that is, large-capacity through holes having a relatively larger cross-sectional area in the cross section perpendicular to the length direction and small-capacity through holes having a relatively smaller cross-sectional area in the cross section, with the numbers of the two types of through holes being substantially set to the same, the large-capacity through holes are sealed at one end of the filter, while the small-capacity through holes are sealed at the other end of the filter, and supposing that the ratio (a / b) of the total (a) of lengths of wall portion which is shared by one large-capacity through hole and the adjacent large-capacity through hole in the cross section perpendicular to the length direction and the total (b) of lengths of wall portion which is shared by one large-capacity through hole and the adjacent small-capacity through hole in the cross section perpendicular to the length direction is defined as a and that the ratio (A / B) of the area (A) of the cross section of the large-capacity through hole and the area (B) of the cross section of the small-capacity through hole is defined as β, α and β satisfy the relationship represented by the following formula (1): β≧(20 / 9) α2+1 (where 0<α≦1.5 and 1<β≧6)  (1).

A ceramic honeycomb filter comprising a ceramic honeycomb structure having porous partition walls defining a plurality of flow paths for flowing an exhaust gas through the porous partition walls to remove particulates from the exhaust gas, the predetermined flow paths among the flow paths being sealed at their ends, a catalyst being carried by the porous partition walls, the porous partition walls having a porosity of 60-75% and an average pore diameter of 15-25 mum when measured according to a mercury penetration method, and the maximum of a slope Sn of a cumulative pore volume curve of the porous partition walls relative to a pore diameter obtained at an n-th measurement point being 0.7 or more, the Sn being represented by the following formula (1):wherein Dn is a pore diameter (mum) at an n-th measurement point, Dn-1 is a pore diameter (mum) at an (n-1)-th measurement point, Vn is a cumulative pore volume (cm<3> / g) at an n-th measurement point, and Vn-1 is a cumulative pore volume (cm<3> / g) at an (n-1)-th measurement point.

An object of the present invention is to provide a honeycomb structural body (filter) which has a low pressure loss upon collecting particulates, makes it possible to deposit a great amount of particulates and ashes, and is less likely to produce cracks. The columnar honeycomb structural body of the present invention includes a plurality of through holes placed in parallel with one another in the length direction, and wall portion that separates the plurality of through holes from one another and constitutes a circumferential face, wherein the plurality of through holes are composed of a group of large-capacity through holes, with one end thereof being sealed so as to cause the total of areas of cross-section perpendicular to the length direction to become relatively greater, and a group of small-capacity through holes, with the other end thereof being sealed so as to cause the total of areas of the above-mentioned cross-section to become relatively smaller, and the above-mentioned circumferential face of the columnar honeycomb structural body has a chamfered corner portion.

A mixing element, which is produced at low cost, has high mixture agitation effectiveness, and is easily made large, and a static fluid mixer using the mixing element are provided. Further, a gas-liquid treatment apparatus with high treatment ability is provided. A mixing element 1 includes: a cylindrical passage tube 2 trough which fluid flows; a plurality of spiral rightward rotation type first blades 3 formed of a perforated object, which are provided in the passage tube 2; a first inner cylindrical tube 5 shaped like a cylinder and disposed inside the blades 3; a plurality of spiral rightward rotation type blades 6 provided in the inner cylindrical tube 5; and an opening 9 formed in the axial center portion of the blades 6. A static fluid mixer is formed by using at least one mixing, element 1 mentioned above.

An exhaust gas purifying system has a honeycomb filter including a porous partition wall having a number of pores arranged so that a plurality of cells communicating between two end faces are formed, and a plugging portion disposed in either of the end faces or inside the cell so as to plug the cell; and a NOx purifying catalyst including a honeycomb catalyst carrier having substantially same shape as the honeycomb filter, and a NOx selective reducing SCR catalyst or a NOx occluding catalyst carried on surface of the partition wall and / or on surface of the pores, wherein the honeycomb filter and the NOx purifying catalytic member are disposed in this order in an exhaust gas flow path where exhaust gas discharged from a diesel engine circulates.To provide an exhaust gas purifying system which realizes excellent purifying efficiency of NOx contained in exhaust gas discharged from a diesel engine, and small pressure loss, and can be mounted in limited space.

A honeycomb structure having porous partition walls having a large number of pores, formed so as to produce a plurality of cells each extending between the two ends of the honeycomb structure, and plugged portions formed so as to plug the cells at either one end of the honeycomb structure or at the insides of the cells, wherein the honeycomb structure has the partition walls of a permeability of 7×10−12 to 4×10−8 m2. The honeycomb structure can provide a honeycomb catalyst structure which is superior in purification efficiency, is low in pressure loss and can be mounted even in a limited space.

A method for the mixing of fluid streams in a duct comprising positioning at least one mixing device having a front side and a back side within said duct through which a first major stream travels, the at least one mixing device determining a total cross-sectional area which is significantly lower than that of the duct so as to allow for the passage of said first major stream, whereby the at least one mixing device is a solid plate provided with one or more protrusions extending outward from the main solid plate body.

A cyclone dust collector having a single or multiple dust collection bodies installed within a housing, wherein the dust collection body is composed of an upper primary cylindrical dust collection part and a lower secondary conical duct collection part, and a single or multiple slits are cut in the wall surfaces of the primary and secondary dust collection parts in such a manner that large dust particles with large inertial force are removed between the dust collection housing and the dust collection body via the slit(s), while small dust particles with small inertial force make a swirling flow motion within the dust collection body and are removed by the centrifugal force.