588results about How to "Avoid pressure loss" patented technology

A static mixer for an exhaust gas system of an internal combustion engine with which at least two different fluid streams are mixed almost homogeneously after a short mixing distance, and with which back-flow effects and pressure losses are avoided, to the greatest possible extent. Due to the placement of flow guide devices, the inclined front sections of which are disposed alternately facing in different directions, and by the configuration and placement of the fluid passage spaces, which are delimited by guide elements, intensive and homogeneous mixing of two different fluid streams is achieved, while avoiding turbulent flows and pressure losses. Mixing of the fluid streams is supported by guide vanes that are disposed on the flow guide elements in the front region of the central center element, and on a frame that delimits the inclined sections of the flow guide elements.

The present invention provides a speed governor (5) suitable for use in a fluid driven down-hole tool (3). The speed governor comprises an actuator (7) operatively coupled to a motive fluid flow control valve (6). The actuator is and arranged so as to be activatable, directly or indirectly, in response to the running speed of the tool (3), for opening of the control valve (6) with increasing rotational speed of the motor (3) above a predetermined speed limit thereby to limit the rotational speed of the downhole tool (3).

The invention relates to the field of heating ventilation air conditioners, in particular to an improved air treatment method and a fresh air conditioner device. The invention improves the problems of traditional fresh air treatment and air conditioners and particularly emphasizes that a plate-type air-air heat exchanger and indirect water evaporative cooling are used for recycling energy of sensible heat and latent heat in air exhaust in the fresh air treatment process of damp and hot regions in summer and condensed water is directly evaporated on an evaporator to improve the working condition of a compressor. Under the condition of quantificationally supplying outdoor fresh air, the energy efficiency ratio of the fresh air conditioner is increased, the thermal pollution, damp pollution and noise pollution of the fresh air conditioner to environments are reduced, the indoor air quality is improved, and meanwhile, the fresh air conditioner provides the manufacture, installation and using convenience for a local region all-air central air conditioner. The fresh air conditioner provided by the invention and a design and manufacture method of the fresh air conditioner are applicable throughout the year in various regions, particularly in the damp and hot regions; and the fresh air system provides controlled, comfortable and healthy air environments for indoor activity space of people and air conditioner environments for technology for processing, storage and the like.

The Coriolis mass flow meter of this invention comprises two parallel curved flow tubes 1 and 2, a drive unit 15, and a pair of vibration sensors 16 and 17. An inlet-side manifold 24 dividing the flow of a fluid being measured into the two flow tubes 1 and 2 from the inlet thereof, and an outlet-side manifold 25 joining the fluid flows flowing in the two flow tubes 1 and 2 to discharge from the fluid outlet thereof are mechanically connected to a meter body 30 only at the inlet side of the inlet-side manifold 24 and at the outlet side of the outlet-side manifold 25, respectively. With this arrangement, the effects of vibration transmitted from the meter body 30 and all structures connected thereto can be reduced at the joint parts between the inlet-side and outlet-side manifolds 24 and 25 that serve as vibration fulcrums.

A method for producing a honeycomb filter from a honeycomb structure having large numbers of flow paths partitioned by cell walls, comprising inserting a tubular member into each of the flow paths, and injecting a plugging material into each of the flow paths from the tubular member to form a plug in each of the flow paths at a position separate from the end surface of the honeycomb structure, the tubular member having an outer diameter that is 40-90% of the opening size of the flow path, the plugging material comprising at least a ceramic material having a maximum particle size that is 85% or less of the inner diameter of the tubular member, and an average particle size of 1 μm or more.

A centrifugal compressor that includes an impeller, a diffuser and a shroud. One of the diffuser and shroud includes a plurality of recesses and the other of the diffuser and shroud includes a plurality of radial vanes. The shroud covers the impeller and diffuser such that each radial vane projects into a respective recess.

A honeycomb structure includes: a porous substrate having porous partition walls separating and forming a plurality of cells functioning as fluid passages, a porous coat layer disposed on a surface of the partition walls to inhibit microparticles from entering, a surface of the coat layer having an uneven shape to increase a surface area, and plugging portions for plugging cells so that a fluid flowing into the structure from an opening portions on one end side of predetermined cells may pass through the partition walls and flows out from opening portions on the other side of the other cells to allow the gas to flow through the partition walls and the coat layers. The honeycomb structure can inhibit the pressure loss from increasing upon trapping particulate matter in exhaust gas and can effectively combust and remove the trapped particulate matter.

There is provided a method for manufacturing a plugged honeycomb structure, where slurry 6 functioning as a raw material for the plugged portions is stored in a storage container 7 so that the slurry 6 may have a flat interface, and the plugged portions are formed by pressing an end face of the honeycomb structure 3 having a mask 8 for forming plugged portions disposed so as to cover open end portions of the cells other than the cells 9 to be plugged of the honeycomb structure 3 against the slurry 6 stored in the storage container 7 to introduce the slurry 6 into the inside of the cells 9 to be plugged.

A flow channel with a branch channel perpendicular to a main channel including an edge defining an inlet opening of the branch channel is provided. A chamfer is disposed at the upstream edge of the inlet opening and a straight edge is disposed at the downstream edge of the inlet opening, perpendicular to the main channel.

In a polymer electrolyte fuel cell, at least one of the anode side separator plate and cathode side separator plate is formed with a main surface having a convex shape protruding toward a gas diffusion layer, and a peripheral edge portion surrounding the main surface. An average thickness of the main surface is made to be thicker than an average thickness of the peripheral edge portion. And a difference Δt between the thickest part of the main surface and an average thickness of the peripheral edge portion is made to be 5-30 μm.

A filter catalyst is for purifying exhaust gases emitted from internal combustion engines and including particulates, and includes a wall-flow honeycomb structure and an upstream-side straight honeycomb structure. The wall-flow honeycomb structure includes inlet cells clogged on the downstream side of the exhaust gases, outlet cells neighboring the inlet cells and clogged on the upstream side of the exhaust gases, filter cellular walls demarcating the inlet cells and the outlet cells and having pores, and a catalytic layer formed on the surface of the filter cellular walls and/or the surface of the pores of the filter cellular walls. The upstream-side straight honeycomb structure is disposed on the upstream side of the exhaust gases with respect to the wall-flow honeycomb structure, is provided integrally with the wall-flow honeycomb structure, and includes upstream-side straight cells in which the exhaust gases flow straight, and upstream-side cellular walls demarcating the upstream-side straight cells.

A control method for uniformly laminating a multi-layered PCB is disclosed. The control method comprises the steps of PCB laminating and pressing. The control method is simple, convenient, and easy to operate and master; the layers are aligned accurately and the PCB is pressed uniformly; board sliding and decompression can be avoided, and high product quality can be achieved; the lamination process is easy to control, and easy machining and low cost are realized as well; the relatively consistent uniformity of the thickness of each laminated board among different layers can be accurately ensured; sufficient and uniform flowing adhesive in all directions is supplied; the thickness and the impedance of a laminated dielectric layer are moderate; the board edge is designed in a choked-flow manner; the overall uniformity of the laminated PCB is high; the fused flowing time of resin in a prepreg is prolonged, so that sufficient stuffing among the multiple core plate layers is ensured, uniform fused resin flowing is realized, and the efficiency is greatly improved; and in addition, the service life of equipment is prolonged, the lamination quality is effectively ensured, and the production cost is lowered.

The invention is concerned with the thermolysis packaging structure and the making method, it is: attaches the semiconductor chip with the chip carrying piece by electricity to form the surface or the second heat sink with surface, and attaches the first heat sink with thermolysis part that is opposites the open whole of the semiconductor chip and the support part, with the chip carrying piece, next, is forms the surface or the second heat sink with surface that covers the semiconductor chip and the packaging colloid of the first heat sink, and there is must certain space leaves for the packaging colloid covering the surface, which is the way of preventing the problems of pressure damage and glue overflow of the current making method, and to the next step is incises the packaging colloid follows the surface edge and removes the unwanted, losses heat for the semiconductor chip, in order to prevent the problems of raw edge and tools wastage, which reduces the cost efficiently.

A honeycomb structured body of the present invention is a honeycomb structured body in which a plurality of cells are placed in parallel with one another in the longitudinal direction with a cell wall therebetween, either one of the end portions of the cells being sealed, wherein a porosity is at least about 70% and at most about 95%, and a ratio of a diameter of a cross-section perpendicular to the longitudinal direction of the honeycomb structured body to a length of the honeycomb structured body in the longitudinal direction is at least about 0.2 and at most about 0.9.

A cordierite-based ceramic honeycomb filter comprising a honeycomb structure having a large number of flow paths partitioned by porous cell walls, and plugs alternately formed in said flow paths on the exhaust-gas-inlet side or the exhaust-gas-outlet side for permitting an exhaust gas to pass through said porous cell walls to remove particulate matter from the exhaust gas, said porous cell walls having porosity of 45-58%, an average pore size of 15-30 μm, the volume of pores having pore sizes exceeding 50 μm being more than 10% and 25% or less of the total pore volume, the volume of pores having pore sizes of 100 μm or more being 1-8% of the total pore volume, the volume of pores having pore sizes of less than 10 μm being 3-10% of the total pore volume, and said pores having a pore size distribution deviation σ [=log(D20)−log(D80)] of 0.6 or less, wherein D20 represents a pore size (μm) at a pore volume corresponding to 20% of the total pore volume, and D80 represents a pore size (μm) at a pore volume corresponding to 80% of the total pore volume, both in a curve representing the relation between the pore size and the cumulative pore volume, and D80<D20.

Provided are a gas turbine silencer for avoiding the formation of gaps between an upstream silencer panel and a downstream silencer panel and suppressing the occurrence of secondary noise, and a gas turbine provided with this silencer. A silencer panel (41) has a structure that can be divided into an upstream silencer panel (51) and a downstream silencer panel (52) in an airflow direction, a stepped part (71) shorter in length along the alignment direction of the silencer panel (41) is formed in an opening-side portion of the downstream silencer panel (52), and the upstream silencer panel (51) and downstream silencer panel (52) are linked by the stepped part (71) fitting into substantially the entire opening (64) in the upstream silencer panel (51).

A compact vacuum cleaning device for automatic cleaning of smooth and textile floor coverings, particularly in the private home sector, has a housing, a suction mouth on the underside of the housing, a cleaning roller disposed in a roller chamber, a dust collection container, a suction fan, an electrical travel drive, control electronics, and a power source. The device height of the vacuum cleaning device is less than 180 mm. The maximal suction air stream that enters through the suction mouth, passes through the dust collection container, and leaves the vacuum cleaning device through the suction fan, is greater than 15 l/s. The maximal suction power is greater than 10 W.

An ejector includes a nozzle and a needle valve formed in a tapered shape. The needle valve controls a throttle opening degree of the nozzle from a minimum degree to a maximum degree while an end section of the needle valve is positioned on a downstream side with respect to a throat section of the nozzle. Besides, a cross-sectional area of a nozzle diffuser is formed to be substantially constant, downstream of the throat section. Thus, a cross-sectional area of a substantial refrigerant passage defined by an inner surface of the nozzle and the needle valve is gradually widened in accordance with the tapered shape of the needle valve. Therefore, pressure loss accompanied with a rapid expanding can be suppressed. As a result, the throttle opening degree of the nozzle can be controlled while improving nozzle efficiency and ejector efficiency.

A measuring segment is integrally formed in a wing model. A plurality of thin membranes are formed on a surface of the measuring segment at predetermined intervals in a cord direction with a distortion gauge fixed to a back face of each of the plurality of thin membranes to output an electric signal upon distortion. The electric signals are converted by a pressure conversion means into pressures, thereby measuring a pressure distribution in an airflow direction. It is possible to prevent the generation of a step or a gap which affects an airflow along the surface of the measuring segment, thereby improving accuracy. The measuring segment is integrally molded by an optical molding method to form a complicated shape with a high accuracy and a low cost. Further, a plurality of the measuring segments may be disposed at intervals in a span direction for measuring pressure distributions.

To provide a fan unit for a wind power generator and a wind power generator, which are capable of preventing a loss of a flow at a flow port from increasing and capable of preventing a pressure loss of a heat exchanger from increasing. A fan unit for a wind power generator (52) having an axial fan (54) for discharging air in a nacelle of the wind power generator to a rear side of the nacelle, the axial fan (54) being provided on a floor (F) of the nacelle, and an equipment (51) of the wind power generator provided in front of the axial fan (54) in a direction of a rotation axis (L) is characterized by including a rectification part (56) for adjusting distribution of the flow rate of air flowing into the axial fan (54).