232results about How to "Improve rectification effect" patented technology

The invention relates to a multiphase flow rectifying device which comprises a pipe connecter matched with a fluid pipeline, a spiral body and a flow adjustor, wherein the pipe connecter is provided with an upstream rectifying cavity and a downstream diffusion steady flow cavity; the spiral body is installed in the upstream rectifying cavity, and the flow adjustor is installed in the downstream diffusion steady flow cavity; and the upstream rectifying cavity of the pipe connecter has conicity matched with the spiral body. The fluid in two-phase flow or multiphase flow rotatably flows in the spiral direction and becomes the fluid with evenly distributed media and steady flow rate after being mixed and passing the porous flow adjustor. The invention has simple structure, simple and convenient installation and construction, less abrasion of the spiral body and the flow adjustor, favorable rectifying effect and high reliability and can not block the pipeline for long-term use, is particularly suitable for rectifying the fluid in the two-phase flow or the multiphase flow and can be matched with a flow meter to carry out the flow measurement of the two-phase flow or the multiphase flow.

A method of forming a poly-silicon pattern may include forming an amorphous silicon pattern on a lower layer; forming a capping layer on the substrate covering the amorphous silicon pattern; poly-crystallizing the amorphous silicon pattern using an excimer laser annealing process; and removing the capping layer.

The invention relates to a single-circuit output flyback converter controlled in a current mode. The single-circuit output flyback converter comprises an alternating current input source, wherein the alternating current input source inputs direct current to a first buffer circuit through an input filter capacitor after passing through a rectifier bridge circuit; the first buffer circuit is connected in parallel to a primary winding of a transformer, the primary winding is connected with the drain electrode of a switching tube, and a secondary winding is respectively connected with an output rectifier diode and the input end of a first absorption circuit and is connected to a control chip through a chip power supply circuit; the output end of the output rectifier diode is connected to a three-terminal voltage-stabilizing circuit through an output filter capacitor after being connected in parallel with the output end of the first absorption circuit; a second buffer circuit is connected in parallel between the source electrode and the drain electrode of the switching tube, and the grid electrode and the source electrode are respectively connected with the control chip through a sampling resistor; the compensation end of the control chip is connected with the output end of an isolating circuit, the input end of the insolating circuit is connected in parallel with the output filter capacitor, and the other input end of the isolating circuit is connected with the three-terminal voltage-stabilizing circuit which outputs voltage-stabilizing direct current; and a second absorption circuit is arranged in the three-terminal voltage-stabilizing circuit.

The invention discloses a device for adjusting fluid distribution in a pipeline and a method thereof. When gas-fluid mixed fluid flows through a spiral blocking plate, fluid on one side, where more fluid is distributed, of the pipe wall can move to one side where the fluid content is low in the rotation direction of the spiral blocking plate. Meanwhile, the spiral blocking plate can enable the flow speed of the gas-fluid mixed fluid to increase to improve mixing of gas and fluid. When the flow speed of mixed fluid is smaller than 20m/s, a spiral angle of the spiral blocking plate is larger than 45 degrees. When the flow speed of the mixed fluid is larger than 20m/s, the spiral angle of the spiral blocking plate is smaller than 45 degrees. The turn number n is equal to L/(tan alpha . D) - 2, the alpha is the spiral angle of the spiral blocking plate, and the D is the pipeline diameter. The device is excellent in rectification effect of fluid, suitable for rectifying various kinds of fluid, avoids blockage, prolongs service life of various assemblies and reactors after pipes are bent, is small in pressure drop, reduces conveying energy consumption, and meanwhile is simple in structure and easy to install and dismount.

The invention discloses a device and a process for coordinative treatment of smoke desulfuration and dedusting. The process includes that crude smoke enters an absorption tower and sequentially pass through a tray layer, a spray layer, a sedimentation and cooling area and an efficient demisting layer and out of the outlet of the absorption tower, the smoke entering the absorption tower in the tray layer is reshaped and rises up at uniform speed over the section of the absorption tower, SO2 in the smoke and size in the accumulative liquid layer and the sprayer layer above the tray can be effectively removed, saturated smoke with small size drops and dust can be settled through the cooling area after desulfurized, and size drops and dust may be abundantly settled. The size drops and dust unsettled can enter a cyclone demister layer along with airflow and be removed through cyclone and collision, and clean smoke treated can be discharged from the outlet of the absorption tower. By the process of reshaping the smoke and sequentially spraying, absorbing and efficiently removing dust and mist, desulfurization, and demisting and dedusting efficiency of the wet-method desulfurization device is improved, and operation energy consumption is lowered.

The invention discloses a high speed steel finishing roll of a wire bar mill and a manufacturing method of the high speed steel finishing roll, belonging to the technical field of machining and casting. The finishing roll consists of a roll neck and a roll body comprising a working layer, a primary core and a core part; the working layer comprises the following chemical components: 1.50-2.50 percent of C, 0.40-1.00 percent of Si, 0.40-0.80 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, 4.0-8.0 percent of Cr, 0.50-1.00 percent of Ni, 5.00-8.00 percent of Mo and 5.00-8.00 percent of V. In the casting process, the casting temperature and the rotating speed of a centrifuge can be controlled by adopting manners of high-temperature discharge from a furnace, low-temperature casting, high-speed mold filling and slow-down solidification. According to the high speed steel finishing roll and the manufacturing method of the high speed steel finishing roll, the adaptability of high speed steel materials on bar rolling can be effectively solved by reasonable design of alloy components and the processing technology, and the wear resistance and the millimeter rolling quantity of the roll are improved; in addition, the high speed steel finishing roll has favorable thermal crack resistance, and the working efficiency of a heavy and medium plate mill can be greatly improved.

A droplet discharging head includes a first through hole having an outlet for discharging of a liquid material and a second through hole having an inlet for injection of the liquid material, the second through hole having a protrusion on

The invention discloses a half-blade-rotor-type axial flow blood pump which comprises an inner barrel, a front guide, a rotor and a rear guide. The front guide has three straight blades, the rotor has two rotating blades, the two rotating blades of half-blade structures are distributed on a front half of a hub of the rotor only, and blade tip clearance length of the rotor is reduced by a half; the rear guide has three big rotating blades and three small rotating blades, the big rotating blades and the small rotating blades are distributed at intervals, each big rotating blade is provided with a suspension arm with one-half length, each suspension arm extends into a rotor area to form a suspension arm blade structure, and a runner portion on the outer surface of the rotor is made by smooth date-pit-shaped cubic spline curves. The half-blade-rotor-type axial flow blood pump has the advantages that a whole runner formed by the front guide, the rotor and the rear guide is designed to be of a date-pit-shaped structure, and the smooth cubic spline curves are adopted, so that pressure rise of the blood pump is increased, flow field distribution in the pump is improved, area of a rotating-stilling interface is reduced, and risk of thrombosis at a bearing is lowered.

The invention relates to the technical field of unmanned aerial vehicles (UAVs), in particular to a UAV for logistics. The UAV comprises a fuselage; four jib arms are fixed on the top of the fuselage;each jib arm is provided with a motor and a propeller; the interior of the fuselage is hollow; a plurality of balls are arranged at the bottom in the fuselage; a cabin door is arranged at one side ofthe fuselage, and an electric push rod is arranged at the side corresponding to the cabin door; one end of the electric push rod is connected with a push plate; the fuselage is provided with a two-dimensional code display screen. The structure of a UAV body adopts four rotors forming a structure of intersecting parallels, and the center of the UAV body is a hollow cube; a warehouse is the designconcept of the UAV body; the volume and self-weight of the UAV body are minimized while the storage space is guaranteed; and vibration, caused by split connection, of the warehouse can be avoided, sothat the stability of the UAV body is prevented from being affected; furthermore, the position of the center of gravity of a cargo storage area is raised, so that the overall center of gravity of theUAV shifts upwards when the UAV carries cargoes, and the UAV body is compact in whole structure and high in maneuverability.

A boron phosphide-based semiconductor device enhanced in properties includes a substrate (11) composed of a {111}-Si single crystal having a surface {111} crystal plane and a boron phosphide-based semiconductor layer formed on the surface of the substrate and composed of a polycrystal layer (12) that is an aggregate of a plurality of a triangular pyramidal single crystal entities (13) of the boron phosphide-based semiconductor crystal, where in each single crystal entity has a twining interface that forms an angle of 60° relative to a <110> crystal direction of the substrate.

The present invention provides a method for manufacturing a compound semiconductor substrate. The method for manufacturing a compound semiconductor substrate comprises the steps of:

• (a) epitaxially growing a compound semiconductor functional layer 2 on a substrate 1,
• (b) bonding a support substrate 3 to the compound semiconductor functional layer 2,
• (c) polishing the substrate 1 and a part of the compound semiconductor functional layer 2 on the side which is in contact with the substrate 1, to remove them,
• (d) bonding a thermally conductive substrate 4 having a thermal conductivity higher than that of the substrate 1 to the exposed surface of the compound semiconductor functional layer 2 which is provided in the step (c) to obtain a multilayer substrate and
• (d) separating the support substrate 3 from the multilayer substrate.

The invention discloses a pre-rotation triangular conduit for a right-handed rotation single screw vessel. The pre-rotation triangular conduit has a fan-shaped structure; seen from the rear side of a screw propeller, a second blade and a first blade are arranged from top to bottom on the left side of a longitudinal central line of a propeller hub of the screw propeller, and a third blade is arranged on the right side; a blade back of a guide plate is fixedly connected with a blade tip of the first blade, a blade tip of the second blade and a blade tip of the third blade respectively; the included angle range of the first blade and the longitudinal central line of the propeller hub of the screw propeller is 70-75 degrees; the included angle range of the second blade and the longitudinal central line of the propeller hub of the screw propeller is 25-30 degrees; and the included angle range of the third blade and the longitudinal central line of the propeller hub of the screw propeller is 70-75 degrees. By using the principle of pre-rotation before the propeller and screw propeller upper inlet flow acceleration, the pre-rotation triangular conduit is a piece of body energy saving equipment with more uniform inlet flow of the screw propeller disk; and importantly, the energy lost due to rotation of a wake flow field of the screw propeller is reduced, the screw propeller propulsive efficiency is improved and the additional form resistance due to tail flow separation is reduced.

An exhaust system for a steam turbine provided with an improved annular flow guide in a high or intermediate turbine. The improved flow guide reduces flow turbulence in an exhaust hood and reduces pressure loss to thereby improve turbine plant efficiency.

The shape (vertically symmetric) of a flow guide 5A according to a conventional technology was modified into the shape (vertically asymmetric) of a flow guide 5 such that the length of a downstream flow guide portion 5d is greater than that of a upstream flow guide portion 5u. Numerical analyses were performed to find the optimum flow guide occupation ratio of the conventional technology and the corresponding total pressure loss coefficient. The obtained values were used as reference values. Further, the flow guide occupation ratio of the upstream flow guide portion 5u was set at 0.4 and the flow guide occupation ratio of the downstream flow guide portion 5d was set at 0.7; at values where the total pressure loss coefficient becomes lower than the reference value. The rectification effect of the flow guide can thus be enhanced.

The invention comprises multi rectification boxes; each rectification box shapes cuboid, and has a shielding cover on its external surface; the rectification boxes are attached together through link connection, and on all identical end faces of them, the securing plates are respectively installed; on the both end of each securing plate a discharge ball is respectively mounted; a gap is kept between two discharge balls respectively located on the two neighboring plate; the end faces of the rectification boxes opposite to the discharge balls there are shielding plates installed; the shielding plates are secured on the corresponding rectification box, the other end of each rectification box extends out to same direction and is overlapped with other shielding plates on the rectification boxes.

In a commutator (5) of a rotating electrical machine (1), each commutator segment (6) has a low resistance layer (61) made of a low resistance material and a high resistance layer (62) made of a high resistance material , wherein the resistivity of the high resistance material is higher than the resistivity of the low resistance material. The low resistance material contains a carbon material and a binder. The high resistance material contains a carbon material, a binder, and an inorganic substance such as boron nitride. The mixing ratio of the inorganic substance in the high resistance material is greater than 20wt%. Alternatively, the brushes (4) in contact with the commutator segments (6) may have a high resistance layer (42) and a low resistance layer (41).

There is provided a rectifying element which is provided with an insulating base, (a) a pair of electrodes composed of a first electrode and a second electrode and (b) a semiconductor layer arranged between the pair of electrodes, wherein the components (a) and (b) are provided on a first surface of the insulating base. The rectifying element is configured such that the semiconductor layer (b) contains carbon nanotube composites each of which comprises a carbon nanotube and a conjugated polymer adhered onto at least a part of the surface of the carbon nanotube. The present invention provides a rectifying element having excellent rectifying properties by a simple process.

The invention discloses a water discharging device with a cleaning function. The water discharging device comprises a body part, a flow divider, a filter screen and a sealed part, wherein the flow divider is arranged in a mounting through hole of the body part and is provided with a bottom wall and a surrounding part which surrounds outside the bottom wall and is provided with a plurality of communicated flow dividing holes; the filter screen is arranged at the front end of the flow divider; one opening of a drain channel is a drain through hole formed in the center of the filter screen, and the other opening of the drain channel is communicated with the flow dividing holes; the sealed part is connected to the flow divider and can be changed between a clean state and a sealed state, and the connection or disconnection of the drain channel is controlled by controlling the sealed part to be in the clean or sealed state. The water discharging device has the advantages that capability of preventing impurity particles from blocking a water outlet nozzle, cleaning the filtered impurity particles and sharing the flow dividing holes, simple and compact structure, relatively small occupied space, low mould opening cost and relatively high rate of finished products.

In a p-n junction-type compound semiconductor light-emitting diode provided on a crystal substrate with at least an n-type active layer formed of a Group m nitride semiconductor as a light emitting layer, and with a Group m nitride semiconductor layer containing a p-type impurity on the n-type active layer, the diode has a boron phosphide-based Group III-V compound semiconductor layer possessing a band gap exceeding that of the Group m nitride semiconductor forming the n-type active layer at room temperature and exhibiting a p-type electroconductivity in an undoped state deposited on the p-type impurity-containing Group III nitride semiconductor layer, and has an ohmic positive electrode joined to a surface of the boron phosphide-based Group III-V compound semiconductor layer.

The invention discloses a filter screen of a range hood. The filter screen is characterized by comprising a plurality of ventilation surfaces which are arranged side by side from left to right, wherein each ventilation surface is a concave surface with high left and right sides and a low middle part; a plurality of meshes are formed in the two side surfaces of each ventilation surface; the concave part in the middle of each ventilation surface forms a drainage trough; the concave depth of each ventilation surface is gradually increased from the front end to the back end. The filter screen is provided with the plurality of ventilation surfaces with the high two sides and the low middle part side by side and the meshes are formed in inclined planes of the ventilation surfaces, so that the filter screen has a larger area for oil fume to pass through compared with a planar filter screen, and the exhaust efficiency is improved; besides, the oil fume can collide with the side surfaces of the ventilation surfaces for a plurality of times when passing through the filter screen, so that grease can be easily condensed on the ventilation surfaces and flow into an oil cup along the drainage troughs; moreover, because the oil fume collides with the filter screen for a plurality of times, the oil fume flow can be scattered, and then the rectifying effect of the oil fume passing through the filter screen is improved.

A process and equipment for preparing the prefabricated body of optical fibre is disclosed. A seed rod is put in reacting container via frange tube to make it opposite to spray gun. A cylindrical fairing body is linked to said seed rod in such manner that the lower end of fairing body is near the lower end of seed rod. A gas flow is introduced in from said frange tube, flows through the gap between said seed rod and fairing body, and finally is exhausted. It can stabilize the pressure in reacting container and carry out the microparticles of SiO2 and GeO2.

The invention relates to a pumping chamber for a shaft seal type nuclear main pump. The pumping chamber is composed of a guide vane body and a pump case. Due to the limitation of the installation space of the nuclear main pump, for the nuclear main pump guide vane body of the nuclear main pump, the axial installation height is reduced by increasing the number of guide vanes and additionally arranging the structure of double diffusion sections; meanwhile, a thermal insulation device needs to be mounted on a shaft seal pump, and the enough installation space is left for a thermal insulation body in the guide vane body structure; and the corresponding structural treatment is conducted on guide vane inlets and guide vane outlets, the backflow of the inlets is reduced, and the radial circulation of the outlets is eliminated. The pump case is of an annular section direct-output type pumping-out chamber structure, the inner wall is smoothly treated, the angle of throat of an outlet is 20 degrees, the backflow of the outlet of the pumping-out chamber can be reduced, the backflow is the main reason causing the pressure pulse, and the influence of the pressure pulse on the efficiency, the stability, the noise and cavitation of a pump assembly is extremely large. The nuclear main pump water pumping chamber is applied to a 2-nd generation nuclear main pump structure.

The invention provides an entrance guiding cone used for a vertical oil-gas mixing transmission pump, the guiding cone is arranged at the center of the cavity of the vertical oil-gas mixing transmission pump uniform blender and positioned at the entrance of the mixing transmission pump; the guiding cone is at least constructed by a guiding cone body, a round diversion pad and a guiding cone base tightly connected with each other in sequence from top to bottom; the lateral periphery of the guiding cone is distributed with diversion vanes used for diverging the direction of the multi-phase fluid; the lateral periphery of the guiding cone base and the diversion pad are consecutive streamline surface; and the lower part of the guiding cone base is connected with the shell of the mixing transmission pump uniform blender. The guiding cone uses the diversion vanes to commutate oil-gas multi-phase fluid to be fit for entering the mixing transmission pump pressurizing unit to guarantee the normal work of the pressurizing unit, thus ensuring that the oil-gas mixing transmission pump operates stably and safely, and the work performance of the vertical oil-gas mixing transmission pump can be optimal.

The invention relates to a tunnel fire simulation experiment device under the action of multi-angle canyon wind, which belongs to the technical field of fire safety and comprises an experiment table main body, a canyon wind system and a matched measurement and control system, wherein the experiment table main body comprises a tunnel model movably connected to a bracket; the canyon wind system comprises a draught fan and a rectification box which are movably connected to the bracket, and an air outlet of the draught fan is communicated with the rectification box through a soft connection section. The rectification box comprises a butt joint section, a rectification section and a current stabilization section which are connected in sequence. The device is simple in structure, the device is simple in structure and low in manufacturing cost, makes up the defects that a full-size experiment is high in cost and a numerical simulation tool is not accurate enough, guarantees the repeatabilityof the experiment, and has great application value and important guiding significance for developing laboratory scientific research and the influence of actual canyon wind on bridge tunnel ventilationand tunnel fire in a high-altitude area.