395results about How to "Low pressure loss" patented technology

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 Sb being represented by the following formula (1): Sn=-(Vb-Vn-1)/[log Dn-log (Dn-1)] (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 (cm3/g) at an n-th measurement point, and Vn-1 is a cumulative pore volume (cm3/g) at an (n-1)-th measurement point.

A filter medium which has an average pore diameter of more than 0.5 .mu.m, a pressure loss of 2-50 mmH.sub.2 O determined when air is permeated therethrough at a velocity of flow of 5.3 cm/sec, and a PF value of 18-12, which is calculated in accordance with the following equation on the basis of this pressure loss and a collection efficiency using DOP of a grain size of 0.10-0.12 .mu.m. ##EQU1##

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 fuel cell system includes an ion-exchange filter, which is provided with a cartridge which is filled up with an ion-exchange resin. The cartridge includes one of a pressure-loss emphasizing type cartridge and an ion-exchange efficiency emphasizing type cartridge, which are selectively exchanged with each other, for a common case of the ion-exchange filter. The ion-exchange efficiency emphasizing type cartridge is one for an ion-exchange filter having a high pressure loss and high ion-exchange efficiency and, on the other hand, the pressure-loss emphasizing type cartridge is one for an ion-exchange filter having a pressure loss lower than that of the former ion-exchange filter and an ion-exchange efficiency lower than that of the former ion-exchange filter.

To reduce pressure loss on a heat-exchanger fluid while downsizing a heat exchange and reducing the production cost of the heat exchanger without impairment of the heat transfer performance of the heat exchanger by forming a fluid channel in surfaces of thin metal plates such as stainless steel plates through the use of an etching technique or the like and by improving the shape of the fluid channel. In a heat exchanger in which a plurality of heat exchanger fins are provided in thin metal plates by using an etching technique or the like and a fluid channel for a heat-exchanger fluid is formed between the two opposed thin metal plates by alternately stacking the thin metal plates, the area of the fluid channel, through which the fluid flows between the heat exchanger fins, is made substantially uniform by forming the heat exchanger fins so as to have a curved cross-sectional shape from the front end thereof to the rear end.

This invention provides a honeycomb catalyst having an excellent purification efficiency and a small pressure loss and can be mounted even in a limited space, the honeycomb catalyst comprising: porous partition walls 4 having plural pores 25, which are arranged to form plural cells 3 allowing communication between two end faces; plugging portions being arranged to plug the cells 3 in one of the end faces; and catalytically active components 5, 15 loaded on surfaces of partition walls 4 and inner surfaces of pores 25, wherein many catalytically active component-loading pores 35 through which a gas can pass are formed in partition walls 4, and a ratio of a mass (M_W) of the catalytically active component loaded on the surfaces of partition walls 4 to a mass (M_P) of the catalytically active component 5 loaded on the inner surfaces of the pores 25 is (M_W):(M_P)=1:3 to 3:1.

A semiconductor device exhibits low pressure loss and is capable of cooling a plurality of power semiconductor chips evenly. This semiconductor device includes a semiconductor module and a cooler for cooling a power semiconductor element mounted in the semiconductor module. A cooling unit of the cooler has a first header part that has a first bottom surface disposed between a coolant inlet and an end portion of a first substrate on the coolant outlet side and inclined toward a bottom plane of cooling fins so that a coolant supplied from the coolant inlet flows toward the cooling fins; and a second header part that has a second bottom surface inclined from an end portion of the bottom plane of the cooling fins on the coolant outlet side so that the coolant discharged from the cooling fins flows to the coolant outlet.

A catalytic converter having an excellent purification efficiency and small pressure loss and a method for producing the same is provided. A catalytic converter comprises a catalyst coating layer which is coated on the surface of the partition walls of the honeycomb structural body having partition walls which divide and form a plurality of cells functioning as fluid passages. 10% or more of the plurality of the cells are plugged by the plug portions which are formed at the one end or the middle of the passage, the average maximum distance of image of the honeycomb structural body is 10 μm or more and the porosity of the honeycomb structural body is 40% or more, the catalyst coating layer contains at least one oxide selected from the group consisting of alumina, ceria, titania, silica and zirconia, and also a catalyst containing at least one precious metal selected from the group consisting of platinum, rhodium and palladium, or metal exchanged zeolite or vanadium is supported in the catalyst coating layer as the catalytic active constituent, the average maximum distance of image of the catalyst coating layer is 10 μm or more, and the porosity of the catalyst coating layer is 40% or more.

One kind of mechanical type automatic vertically well-drilling tool, including turner, the conduction current head, the bearing, the counterweight, the spindle, in-tube, the back plate, above plate-valve, gets down plate-value, the shell, the piston cylinder back plate and the piston, its principle is at the right moment induces the well slanting gravity signal, by the gravity-actuates in the organization, the establishment drills inside and out the column high-low pressure channel between the fluid, uses two between the differential pressure, actuates the piston at the right moment to push depends on the wall of a well is high side, the wall of a well reacting force then pushes the drill bit to is low side, but in well-eye other positions, the piston does not push depends on the wall of a well, drills the column revolves, this process circulation reciprocation, the well is slanting namely is unceasingly induced and the revision, this invention realization is initiative, At the right moment guards against slanting at the same time, but also can effectively liberate distilling, largely enhances drills fast and well-eye the quality, reduces the construction risk, this invention has the structure is simple, reliable, is suitable to the many kinds of well drilling platform, the processing makes the maintenance cost is low and so on the characteristic.

A wrought fiber sheet or air cleaning filter unit that exhibits high performance and is biodegradable so as to enable reducing load upon environment. The wrought fiber sheet is produced by coupling biodegradable fiber sheets having electret properties by means of a configuration reinforcing member of a biodegradable material. Further, the frame for accommodating the wrought fiber sheet is also constituted of a biodegradable member so as to obtain an air cleaning filter unit that exerts biodegradability as a whole.

A filter material fabricated by mixing 10 to 30% by mass of first fibers having a fiber diameter of 10 to 40 μm, 40 to 80% by mass of second fibers obtained by crimping natural fibers having a fiber diameter of 10 to 40 μm, and 10 to 30% by mass of third fibers having a fiber diameter of 5 to 10 μm. The filter material has low pressure loss a high dust holding amount, and high dust filtration efficiency.

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 cooling device suitable for cooling a laser diode bar constituting a surface illuminating device as a light source for exciting a laser medium of a solid-state laser oscillator of high power. The cooling device is capable of flowing coolant at sufficient flow rate by reducing the pressure loss in the flow passage of the coolant in the device, to realize a light source device of small thickness with high cooling capability and high reliability. The cooling device comprises a first plate member, one or more second plate member and a third plate member to be joined together to form a laminated body. The second plate member has grooved paths formed on both surfaces thereof and having depths greater than a half of thickness of the plate member, and also opened paths for communicating grooved paths formed on the first plate member and the third plate member. The pressure loss in the flow passage of coolant is reduced by increasing a sectional area of the flow passage by the grooved paths and the opened path of the second plate member without lowering mechanical strength of the device and without increasing a manufacturing cost of the device.

A hollow fiber membrane module comprising a bundle of hollow fiber membranes, a housing, an adhesive fixation layer, an inlet and outlet, at least one bias regulating member, and at least one straightening cylinder, in which the bias regulating member is contained in the adhesive fixation layer, the adhesive fixation layer comprises an outer end surface and an inner end surface inside the straightening cylinder, at least some of spaces between the hollow fiber membranes are at least three times as large as an outer diameter of the hollow fiber membrane on the outer end surface of the adhesive fixation layer, and the spaces between the hollow fiber membranes and a space from the hollow fiber membranes to the straightening cylinder are all less than three times as large as the outer diameter of the hollow fiber membrane on the inner end surface of the adhesive fixation layer.

A honeycomb structure includes: porous partition walls having a large number of pores and disposed to form a plurality of cells communicating between two end faces, and plugged portions disposed to plug each of the cells on one of the end faces. A percentage of the number of carbon particulates contained in combustion exhaust gas satisfying the following condition (1) and passing through a honeycomb structure is 80% or more at a space velocity of 25000/h. The condition (1) is that the carbon particulates has a mean diameter of 0.07 to 0.2 μm, a ratio of the carbon particulates having a diameter of 1 μm or more is 0.1% or less in number and that a concentration of the carbon particulates is 10 mg/m³. The honeycomb structure is excellent in purification efficiency, has low pressure loss, and is mountable even in a limited space.

In a combustion method, in a burner (12, 20), a fuel/air mixture flowing through a flow passage (13) is made to react in a first combustion stage in a catalytic reactor (15), and downstream of the catalytic reactor (15) fuel is burnt together with the exhaust gas from the catalytic reactor (15) in a second combustion stage to form a homogenous flame (17) by self-ignition.

If the fuel from the fuel/air mixture is only partially burnt in the first combustion stage in the catalytic reactor (15), and the unburnt remainder of the fuel is burnt in the second combustion stage, combustion can be stabilized by virtue of the fact that the fuel-containing exhaust gas from the catalytic reactor (15), between the outlet of the catalytic reactor (15) and the homogenous flame (17) is passed through devices 916, 19) which aerodynamically stabilize the homogenous flame (17).