269results about How to "Flow field stability" patented technology

The invention relates to a method for manufacturing a three-dimensional flow enclosed-type impeller inter-impeller passage and a special clamp thereof. A specially designed and manufactured molding or quasi-molding tool cathode is used for numerical control electrolytic processing to remove most remainder, then a specially designed and manufactured molding or quasi-molding tool electrode is used for numerical control electric spark precision processing to achieve the design requirement, thereby the three-dimensional flow enclosed-type impeller inter-impeller passage that can not be processed resulting from interference of numerical control milling cutter and undercutting can be manufactured, besides, the method has the technical and economical characteristics of high precision and efficiency, and low cost compared with the prior three manufacturing methods of integral casting, divided processing rewelding and numerical control milling.

A silicon carbide ceramic foam solar energy air heat absorber uses silicon carbide ceramic foam materials as solar energy absorber. The silicon carbide ceramic foam absorber is wrapped with an insulating layer (2). A radiant heat flux (3) projects onto the surface of the silicon carbide ceramic foam absorber (1) or into an artificial blackbody cavity (9) and is received by the silicon carbide ceramic foam absorber (1). Cold air (4) flows in from the side of the silicon carbide ceramic foam absorber (1) positive to the radiant heat flux (3). Hot air (5) is obtained through heat exchange of thecold air and the radiant heat flux. Or the cold air (4) flows in from the side of the silicon carbide ceramic foam absorber (1) positive to the radiant heat flux (3) or back to the radiant heat flux (3). The hot air (5) of 700 to 1300 DEG C is obtained through the heat exchange of the cold air and the radiant heat flux through a quartz window (10). The silicon carbide ceramic foam absorber (1) buries an air diversion channel (8) beforehand. The invention can effectively receive radiant heat and emit heat to the air and take advantage of self-sensible heat to store heat at the same time.

The invention discloses a detachable T-shaped microchannel device and a method for preparing monodisperse polymer microspheres by the same. The method comprises the following steps of: performing heat treatment on a needle tube serving as a disperse phase flowing channel, and processing a duct with the same outer diameter as the needle tube on a pipeline serving as a continuous phase flowing channel to make the disperse phase needle tube and the continuous phase tube form a T-shaped channel; under the stable operating condition, making dispersed fluid form uniform micro liquid drops at a T-shaped tube orifice through the shearing force of continuous phase fluid to the disperse phase fluid; and under the action of a shaker, diffusing an organic solvent out of the liquid drops, and curing the liquid drops to form the polymer microspheres with uniform particle size. The T-shaped microchannel device is simple in equipment and can be detached, and pipelines are easy to dredge after being blocked; and the prepared polymer microspheres have uniform particle size, the particle size distribution coefficient of less than 15 percent, the minimum particle size distribution coefficient of 3 percent, and smooth surfaces without adhesion.

The invention belongs to a device for solid-liquid separation/classification and non-homogeneous separation, specifically a hydraulic cyclone with improved structure of central post and overflow pipe. The device comprises a feed pipe, a cylindrical section, a coniform section, an overflow pipe and a hollow tubular central post with partial-spiral fins and spiral flow deflectors and provided outside the overflow pipe. The central post is a hollow tube provided thereon with a plurality of holes. The spiral flow deflectors are provided on the outer surface of the central post. The spiral fins are provided on the overflow pipe from the bottom of the overflow pipe to a height below the bottom of an inlet pipe. Compared with the prior art, the separation efficiency of the hydraulic cyclone is increased by 5-10% and the energy consumption is reduced by 20%. The hydraulic cyclone has high stability and reliability in separation efficiency and is suitable for solid-liquid separation in ore dressing, dredging, chemical and petroleum industries.

The invention discloses a jet type gas/solid erosion test device, which is composed of an air compressor, a pressure gauge, a pressure control valve, a control box, a dust collector, a spray gun, a nozzle, a sample turntable, a sand storage room, a frequency conversion motor, The air compressor is connected with the spray gun through the gas delivery pipe, the sand delivery pipe and the body. The air compressor is connected with the spray gun. The gas delivery pipe is equipped with a pressure gauge and a pressure control valve. There is a nozzle at the lower end of the spray gun. The sample turntable is located under the nozzle. Driven by a frequency conversion motor, the sand storage chamber is connected to the spray gun through the sand delivery pipe. The spray gun and the sample turntable are located in the closed body, and the sand storage chamber is located at the bottom of the body. Air compressor, pressure gauge, pressure control valve, control box , The dust collector and the frequency conversion motor are located outside the body, and the dust collector is used for dust removal inside the body; the spraying angle of the spray gun is 10° to 90°; the invention makes the sample be eroded by the gas/solid two-phase flow at the same time; the invention is in the working process The medium flow field is stable, and the impact angle can be precisely controlled.

The invention discloses a preparation method of aluminum alloy powder for additive manufacturing, and belongs to the technical field of 3D printing additive manufacturing. The preparation method comprises the steps that impurities in raw materials are removed; a graphite rod is added in a crucible to be roasted at the temperature of 300-500 DEG C; a smelting chamber and an atomization chamber are subjected to vacuum pumping treatment, wherein the vacuum degree reaches 1*10<-4>-1*10<-2> Pa; a heat preservation pot and a tundish are heated; metal liquid flow which perpendicularly drops is broken into small liquid drops through a nozzle with a negative pressure drainage effect under the high pressure of 0.5-6 MPa and high-purity argon, powder is formed through cooling and spheroidizing solidification, and a 5-30 kw high-pressure fan is adopted; and after the temperature is lower than 50 DEG C, screening is carried out under the atmosphere of high-purity argon. The preparation method has the advantages that industrial production can be achieved, the domestic urgent demand for high-performance aeronautical aluminum alloy powder materials is met, and the manufacturing cost is effectively saved.

The invention relates to an equidirectional drainage reverse taper type high-efficiency rotational flow separator, which mainly solves the problems of poor separation effect of tiny oil drops, large volume and inconvenient installation of the traditional hydraulic cyclone separator. The invention is mainly characterized in that a rotational flow cavity section, a large taper section, a small taper section, a tail pipe section and an outlet section are successively distributed between upper and lower sealing faces; the components form a rotational flow cavity body gradually converged towards the central axis after being successively connected; a tapered thimble in the rotational flow cavity body is fixed on inner side surface of the upper sealing face; the taper top of the tapered thimble points to one side of the lower sealing face; an oil outlet pipe is vertically and fixedly connected to the lower sealing face through the center of the lower sealing face; the pipe orifice of the oil outlet pipe is positioned on the lower part of the taper top of the tapered thimble; and a water outlet pipe is horizontally connected to the bottom end of the outlet section along the tangential direction of a cycle. The rotational flow separator has the characteristics of good elimination effect on the tiny oil drops. Compared with the traditional hydraulic rotational flow separator, the rotational flow separator has the advantages of stable flow field and high separation efficiency, and is convenient for technological installation.

The invention provides a muffler transmission loss testing system and a muffler transmission loss testing method for aiming at aerodynamic noise, and particularly relates to a system and a method for testing aerodynamic noise muffling capability of an automotive intake/exhaust muffler. The muffler transmission loss testing system comprises a variable-frequency centrifugal fan, a fan noise muffler, an air flow sensor, an air pressure sensor, a standing wave tube, a microphone set, an electronic air pressure relief valve, a pressure relief valve muffler, an analog/digital conversion board, a gain amplifier and a computer. The muffler transmission loss testing method comprises the steps of fixing a to-be-tested muffler on a table; starting the testing system and performing initialization setting on the testing system; monitoring an air flow and pressure in the standing wave tube; controlling the fan and the pressure relief valve for sustaining the flow and the pressure in the system; testing a sound pressure value at a corresponding position in the standing wave tube; calculating the transmission loss; and outputting a result. The muffler transmission loss testing system and the muffler transmission loss testing method have advantages of simple structure, convenient operation and high accuracy. The muffler transmission loss testing system and the muffler transmission loss testing method fill in gaps in testing the aerodynamic noise transmission loss of the automotive intake/exhaust system.

The invention discloses a co-rotating outflow internal-hole type high performance swirling separator. In the prior art, an effect of removal of fine oil drop of hydroclone is poor. According to the swirling separator, a problem of the prior art is solved. The swirling separator is characterized in that: a circular table-shaped multi-stage internal swirling body is fixed between an upper sealing surface and a lower sealing surface, wherein a inner cylinder in the swirling chamber portion, a inner cylinder in the large conoid portion, a inner cylinder in the small conoid portion, and a inner cylinder in the tail tube portion are sequentially connected from the top to the bottom to form the circular table-shaped multi-stage internal swirling body; the inner cylinder in the small conoid portion has a hollow structure, and is provided with oil collecting holes; a funnel-shaped oil collecting cone is arranged in the inner cylinder in the tail tube portion, an upper open of the oil collecting cone is communicated with the inner chamber of the inner cylinder in the small conoid portion, and a lower open of the collecting cone passes through the center of the lower sealing surface, and forms a fixed connection with a oil output tube, wherein the oil output tube is introduced vertically; a water output tube is connected to the bottom of a outer swirling body, wherein the water output tube is introduced along tangent line direction to the circle of the outer swirling body and is communicated with a swirling inner chamber, swirling water output direction of the water output tube is the same as the swirling direction in the swirling inner chamber. The swirling separator has characteristics of removal of the tiny oil drop in the water, high separation efficiency and simple structure.

A cyclone separator with a wear-resisting target section and a guiding device for a circulating fluidized bed boiler. The cyclone separator comprises a separator inlet flue, a separator barrel body connected with an outlet of the separator inlet flue, a separator cone and a separator standpipe, which are successively connected below the separator cylinder body, and a separator central cylinder inserted into the upper part of the separator barrel body. The lower part of the separator central cylinder is provided with a central cylinder necking; the separator inlet flue is a tapered inlet flue, which is provided inside with a smoke guiding boss, and a smoke diversion part at the outlet; the smoke guiding boss and the smoke diversion part are covered with a high-strength refractory wear-resistant material layer; and one or a plurality of soot blowing mouths are arranged surrounding the smoke guiding boss. Optimization on the flow field in the cyclone separator reduces the direct impact of airflow and wear on the refractory wear-resistant material in the target section, and can improve the continuous operation cycle of the circulating fluidized bed boiler.

The invention relates to mineral separation machinery, in particular to a high-separation precision pulse turbulence flow field fluidized mineral separator. The mineral separator is characterized in that: the separator is provided with a cylindrical machine body; a feed well and an overflow pipe are arranged at the upper end of the machine body; a feed pipe is arranged on the feed well; a discharge cone is arranged at the lower end of the machine body; a discharge port is formed on the discharge cone; and a fluid distributor and a separator which consists of separating plates are arranged inside the machine body. The invention is novel separation technology with the advantages of high efficiency and high treatment capacity of self-production medium and low operating cost, combines the fluidization technology, the pulse turbulence flow field hindered falling technology and the irregular inclined corrugated plate separation technology, uses coarse particle high-density materials in the feed materials as a self-medium solid, makes the separating bed fluidized by using hydraulic jump upward flow, improves the separating medium density, makes materials with density higher than that of the separating medium pass through the bed to be settled at the bottom, makes materials with density lower than that of the separating medium float upward to enter overflow, and has the advantages of unique structural design, high adaptability to feed concentration and material properties, and capacities of controlling the cleaned coal ash no more than 15 percent through separation at one time and controlling 42 to 80 percent tailings coal ash to follow material property.

The invention discloses a water pipe flow stabilizing broadband muffler which comprises a water delivery pipe and a muffler casing. An expanded perforated pipe is fixedly installed on the inner side of one end of a muffler casing body fixedly connected with the water delivery pipe. An end plate is fixedly arranged at the other end of the muffler casing. A shunting perforated pipe is further fixedly connected onto the end plate, and a throttle ring is fixedly arranged at the port position of the inner end of the shunting perforated pipe. The inner diameter of the expanded perforated pipe is larger than the outer diameter of the shunting perforated pipe, the inner end of the expanded perforated pipe and the inner end of the shunting perforated pipe are in fixedly sleeved connection in a gapped mode, and the flowing cross area of the water delivery pipe is smaller than the sum of the hole flowing cross area of the end plate and the flowing cross area of the shunting perforated pipe. The water pipe flow stabilizing broadband muffler can achieve broadband muffling of the water pipe, effectively stabilize a flow field at the outlet end of the water pipe, reduce the water spraying-flowing speed and pressure, accordingly reduce water pipe port noise effectively and achieve the effects of flow stabilizing and broadband muffling.

The invention provides a graphite base and MOCVD equipment, and belongs to the technical field of semiconductors. The graphite base is of a disc-shaped structure, the first circular end face of the graphite base comprises a plurality of epitaxial wafer containing grooves and a plurality of cambered surface grooves, the epitaxial wafer containing grooves are arranged in a multi-layer circular ringmode in the radial direction of the first circular end face, and the circle center of the circular ring coincides with the circle center of the first circular end face. The cambered surface grooves are uniformly formed in the first circular end surface among the plurality of epitaxial wafer containing grooves at intervals, and the inner surfaces of the cambered surface grooves are spherical crown-shaped. The first circular end face of the graphite base comprises the plurality of epitaxial wafer containing grooves and the plurality of cambered surface grooves, and the cambered surface grooves are uniformly formed in the first circular end face between the epitaxial wafer containing grooves at intervals, so that the uniformity of the epitaxial layer at the edge position of the graphite baseis improved, and the consistency of epitaxial wafers is improved.

The invention provides an experimental device and method for mechanical sealing through ball sealers, and belongs to the technical field of sleeve sealing through the ball sealers in an oil reservoir ball put layering improvement technology. A water tank is used for holding fracturing fluid, a plunger pump is connected with the water tank through a pipeline, and an experimental tubing string is connected with the plunger pump through a pipeline. The experimental tubing string comprises a connector, a sleeve tubing string and a sleeve plug, wherein the connector, the sleeve tubing string and the sleeve plug are connected in sequence. The connector is communicated with the plunger pump through the pipeline. The sleeve tubing string is composed of a plurality of perforated sleeves in a sequential connection mode, the upper end of the sleeve tubing string is connected with the connector, and the lower end of the sleeve tubing string is sealed through the sleeve plug. According to the invention, the purpose of testing the minimum critical displacement for sealing of test holes through the ball sealers is achieved, the purpose of testing the influence of the number of the holes on the minimum fluid displacement for achieving sealing of the holes through the ball sealers is achieved, the purpose of testing the influence of the difference between the water absorption amount of stratums on sealing of the stratums through the ball sealers is achieved, and the guidance is provided for determination of the construction displacement of the fluid for conveying the ball sealers.

The present invention relates to an electrolytic machining method of a three-start flexible feed lamina, belonging to electrolytic machining field. It adopts a blade basin cathode and a blade back cathode of automatic feed set in the same axes oppositely and an automatic feed anion vertical to the cathode. The blade roughcast connects with the anion via a clamp. In processing, the blade basin cathode, the blade back cathode and the anion feed simultaneously with adjustable feed speed in order to guarantee optimal feed angles or optimal feed curves for processing to the blade basin and the blade back. To the blade with relatively big torsion degree to the molding surface, sectional feed method can be used. The method can realize once molding of the blade body, marginal plate and inlet(outlet) edges and omnibearing electrolytic machining in order to improve blade machining precision and surface quality. Meanwhile, the present invention also provides a novel electrolyte feed method, which means to make the electrolyte flow along the blade marginal plate, blade body and tip and finally return to electrolyte flume. In this way, it can stabilize the flow field and further improve machining quality.

The invention discloses a controllable sand flow infinitely variable speed fan blade abrasion testing device which consists of an air compressor, a gas delivery pipe, a pressure sensor, a spray gun, a sand storage chamber, a sand flow control valve, a sand pipe, a particle flow sensor, an air inlet pipeline, an erosive wear test chamber, an erosive wear test chamber upper cover, an air outlet pipeline, a deduster, a motor, a frequency converter, a fan propeller, a control cabinet, a motor bracket, an air inlet pipeline bracket, a control cabinet bracket and an angle iron bracket. A series of technical problems that the erosive wear working conditions of a rotary fan blade cannot be really simulated by a conventional erosive wear testing device are overcome.

There is disclosed a gas-firing or oil-burning boiler, in which, a combustion stirring reactor and a combustion chamber connected with a liquid or gaseous fuel feeding device are mounted in the hearth. The hearth bed is used as the boiler bed and the side wall of the hearth is connected with the boiler bed. The surface of the hearth side wall is made of materials capable of resisting the temperature not below 1500 deg. c. The fuel feeding device is connected with the combustion chamber through the front boiler wall and at the exhaust nozzle is disposed an igniter. When the temp. on the wall surface of the combustion chamber is not below 850 deg. c. the boiler can realize non-flame burning in the boiler.

The invention discloses an airtight and two-level porous gas-liquid recycling device for an immersion-type photoetching machine. The airtight and two-level porous gas-liquid recycling device comprises an airtight and gas-liquid isolation device which is installed between a projection objective group and a silicon wafer and comprises an immersion unit lower end cover and a substrate; the immersion unit lower end cover is provided with a central taper hole, a lens injection port, a lens recycling port, a gas-liquid separation cavity, a second-level recycling cavity, a gas injection cavity, a flow-field multilevel buffer structure, a gas buffer groove, an inner sealing groove, an intermediate sealing groove and an outer sealing groove; the immersion unit substrate is provided with a central through hole, a lens injection cavity, a lens recycling cavity, a gas recycling cavity, a substrate second-level recycling cavity, a substrate gas injection cavity and a liquid recycling cavity. A great amount of waste liquid produced in the photoetching process can be recycled through the lens recycling structure, and the rapidness for updating a flow field can be realized; the liquid can be recycled through a two-level porous structure, the stability of the boundary of the flow field can be maintained, the gas-liquid separation is realized, and the primary sealing of the flow field is realized; the leakage of the liquid can be prevented by adopting the airtight structure.

The invention discloses a wood polymer composite prepared by using mixed plastic and cotton stalks in domestic garbage, and a method for preparing the wood polymer composite. The method is suitable for recycling urban domestic garbage. The wood polymer composite consists of the following components in percentage by mass: 35 to 45 percent of polyethylene, 4 to 7 percent of polypropylene, 7 to 12 percent of polrvinyl chloride, 33 to 40 percent of cotton stalk fiber, 5 to 8 percent of compatilizer, 0.2 to 2.4 percent of coupling agent, 0.2 to 0.5 percent of light stabilizer, 0.2 to 0.5 percent of antioxidant, 2.1 to 4.2 percent of lubricant, 1.2 to 2.8 percent of colorant, 0.1 to 0.5 percent of antistatic agent and 0.2 to 0.4 percent of deodorization sterilization preservative, wherein polyethylene, polypropylene and polrvinyl chloride are directly from the urban domestic garbage; and the effect of performing recycling and innocent treatment on the urban domestic garbage can be achieved, white pollution caused by plastic can be reduced, and the construction of environment-friendly society can be facilitated.

The invention relates to a server cabinet comprising a machine body, at least one assembling frame, a radiator and at least one fan module, wherein the machine body is provided with a first framework and a second framework which are opposite; the assembling frame and the radiator are sequentially arranged on the first framework; a cooling liquid is conveyed by the radiator and circularly flows in a plurality of radiating fins of the radiator; the fan module is arranged in the assembling frame and used for guiding an airflow to enter into the first framework from the radiator; and the airflow is wafted from the machine body to the second framework so that the temperature in the machine body is lowered.

The invention relates to a wide and thick plate continuous casting machine dry capping method, and belongs to the technical field of continuous casting technologies. The wide and thick plate continuous casting machine dry capping method particularly comprises the following steps and parameters that in the speed reduction stage, according to the actual measurement tundish tons, in cooperation the tundish measurement actual liquid level, the pull speed is reduced to 0.25 m/min; in the low-speed and constant-speed running stage, according to the tundish tons and the actual measurement liquid level, when the depth of the liquid face of molten steel in a tundish ranges from 100 mm to 300 mm, a plug bar is closed, meanwhile, the pull speed is reduced to 0.15 m/min to 0.2 m/min, and low-speed running is kept; and in the speed increasing process, the blank tail is pulled out of a crystallizer, and the pull speed is increased to a target pull speed. The wide and thick plate continuous casting machine dry capping method has the beneficial effects that slag is not wasted, slag fishing is avoided, low-speed weak-cold control is achieved, and therefore the effective improvement of the tail blank quality is achieved, the tail blank flaw detection yield is improved, the tail blank waste cutting amount is reduced, and the metal yield is improved.