13 results about "Coaxial nozzle" patented technology

The invention relates to the technical field of micro-nano fiber material preparation, and discloses a high-elastic crimped micro-nano fiber sponge and a preparation method thereof.The preparation method comprises the steps that an asymmetric airflow shearing field is constructed by adjusting an eccentric coaxial spray head, spinning solution jet flow is induced to generate high-frequency spiral whipping, and micro crimped fibers are formed; meanwhile, pulse hot airflow generated by an air cushion receiving table is used for carrying out suspension lifting, in-situ heat setting and vertical disturbance on deposited fibers, and an isotropic three-dimensional porous network with a Z-axis physical interlocking structure is constructed. The volume density of the prepared sponge is only 3-30 kg / m < 3 >, the porosity is as high as 90%-99%, the rebound rate is kept at 95% or above after 1000 times of cyclic compression under 60% strain, the problems that a compact film is easily formed, the interlayer binding force is weak and the fatigue resistance is poor in a traditional spinning technology are effectively solved, and the sponge has the advantages of being simple in process equipment, wide in raw material adaptability and the like.

The present application relates to the technical field of gas atomization device, and discloses a tight coupling nozzle structure and a gas atomization device, the tight coupling nozzle structure comprises a gas atomization nozzle disc and a flow guide pipe, the gas atomization nozzle disc is composed of a coaxial nozzle disc upper cover and a nozzle disc base, the flow guide pipe is inserted into the center hole of the thickness of the nozzle disc upper cover and forms a tight coupling assembly structure with the gas atomization nozzle disc, the vertical spacing between the nozzle disc gas outlet and the outer wall of the flow guide pipe is equal to the bottom ring thickness of the nozzle disc upper cover, the bottom ring thickness of the nozzle disc upper cover is 1-2 mm, the inner core of the flow guide pipe is a cylindrical hole, the outside is an integrally formed cylindrical section and a contraction section, and the contraction angle of the flow guide pipe contraction section is 30-60 degrees, the present application optimizes the contraction angle of the flow guide pipe contraction section and the bottom ring thickness of the nozzle disc upper cover, reasonably controls the position of the atomization backflow area, obtains higher fine powder yield, and reduces the probability of nozzle blockage.

A burner comprises a primary nozzle for injecting an oxygen-rich gas. The primary nozzle is designed as a supersonic nozzle. A coaxial nozzle having an annular outlet opening is provided for injecting a fuel gas. The coaxial nozzle is designed as a subsonic nozzle and is coaxial to the primary nozzle. The primary nozzle has a convergent portion and a divergent portion, which adjoin each other at a radius of the narrowest cross-section. The annular outlet opening is located at an end face of the burner. The fuel gas, in the form of hydrogen or a mixture of hydrogen and a hydrocarbon-containing gas, is injected at a fixed inlet pressure and a fixed inlet volumetric flow rate, with respect to a planned thermal power of the burner. In contrast, the inlet pressure and the inlet volumetric flow rate of the oxygen-rich gas are varied according to the application.

This invention discloses a laminar plasma in-situ atomization powder production device and method. The device includes a coaxially integrated laminar radio frequency plasma torch and a supersonic laminar gas atomizing nozzle. A metal wire is vertically fed into the core of the radio frequency plasma torch along its axial center. The end of the wire melts instantaneously without crucible constraint. The resulting melt is then sheared and broken by the supersonic laminar inert gas surrounding the outer ring of the plasma torch outlet, achieving in-situ powder production with simultaneous melting and atomization. This invention integrates plasma heating and melting with supersonic gas atomization within the same coaxial nozzle, eliminating the risk of crucible material contamination, avoiding component segregation problems during the smelting of refractory metals and refractory high-entropy alloys, significantly improving the yield of fine powder, and effectively suppressing the formation of satellite powder. It is suitable for the efficient and high-purity preparation of spherical powders of high-melting-point metals such as tungsten, molybdenum, tantalum, niobium, and rhenium, as well as their multi-component high-entropy alloys.

This application belongs to the field of combustion chamber design, and specifically relates to a micro-sized fuel-air jet mixing nozzle, including an air pipe, a fuel nozzle, and a combustion chamber flame tube; the air pipe and fuel nozzle are coaxially arranged, the air pipe is connected to the combustion chamber flame tube, the fuel nozzle is inserted into the air pipe, the fuel nozzle has a cylindrical structure, the outlet end of the fuel nozzle has a coaxial nozzle hole, and the side wall has an inclined nozzle hole, the outlet of the inclined nozzle hole facing the combustion chamber flame tube. The swirler is eliminated, thus eliminating the large-scale low-speed backflow zone; the use of an 8–15 mm micro-sized air pipe significantly improves the wall heat dissipation capacity, reducing the boundary layer temperature and the probability of spontaneous combustion; the inclined jet is injected along the mainstream direction, avoiding reverse flow, suppressing high-hydrogen fuel backfire at the source, and significantly improving the operational safety of the combustion chamber; the coaxial jet and the inclined jet work together to achieve rapid and uniform premixing of fuel and air over a short distance, avoiding localized rich-fuel high-temperature zones.

The invention belongs to the technical field of semiconductor wafer manufacturing, and particularly relates to a standby energy-saving structure system and an energy-saving method thereof. The invention provides a standby energy-saving structure system which comprises a reaction cavity, a base, a heater, a control system, a gas inlet and a multi-layer coaxial nozzle, and the multi-layer coaxial nozzle comprises a first gas channel used for conveying a metal organic source, an isolation channel, a second gas channel used for conveying a hydride source, a heating resistance wire and a phase change heat storage layer. According to the structure system, the splitting decomposition efficiency of NH3 can be improved by utilizing heat energy in a standby stage, and the splitting decomposition efficiency is quickly released when production is recovered, so that the energy consumption is reduced, the preheating time is shortened, the production efficiency is improved, a heat flow path is naturally switched only by putting in / moving out a wafer, and the structure is simplified and reliable.

The application belongs to the technical field of tobacco, and relates to a microcapsule embedding water-soluble essence as well as a preparation method and application thereof. The wall material of the microcapsule is a temperature-sensitive material, and the microcapsule is coated with a water solution containing water-soluble essence. The temperature-sensitive material is heated to 70-80 DEG C to completely melt, and a molten wall material glue liquid is obtained. The water-soluble essence is dissolved in water to obtain an essence water solution. The molten wall material glue liquid is delivered to the middle layer of a three-fluid coaxial nozzle, the essence water solution is delivered to the inner layer of the three-fluid coaxial nozzle, and the first cold wind of-5-0 DEG C is delivered to the outer layer of the three-fluid coaxial nozzle. The molten wall material glue liquid, the essence water solution and the first cold wind are simultaneously sprayed out by the three-fluid coaxial nozzle, so that the molten wall material glue liquid coats the essence water solution, and the microcapsule is obtained. The microcapsule provided by the application has the effect of slow-release essence, and the preparation method has simple steps and can avoid environmental pollution caused by plastic.

The invention relates to the technical field of coal-fired power plant water treatment and environmental protection, and discloses a flue spray drying combined desulfurization wastewater recycling zero-discharge treatment method which comprises the following steps: performing pressurized dissolved gas and heating modulation on desulfurization wastewater to construct an overheated dissolved gas multiphase working medium; coaxial nozzles are used for cooperating with high-temperature sheath gas to jet towards a main flue, and low-density hollow salt particles are formed through flash evaporation phase change and a bubble expansion mechanism; the coal-fired fly ash penetrates through a jet beam by utilizing an inertia difference based on Stokes quasi numbers, and low-density hollow salt particles are guided to deflect along with airflow to enter a salt-rich branch; and after gas film protection of the virtual impactor is introduced, fine fly ash is further separated and waste salt is recycled by pneumatic cyclone classification. The density of the waste salt is changed through hollow granulation, online separation of the waste salt and the fly ash is achieved in combination with a flow field inertia screening mechanism, the problems of nozzle blockage and scaling are solved through sheath gas and a gas film structure, and zero-emission recycling treatment of the high-salt wastewater is achieved.

The application discloses a method for preparing a porous silk fibroin bone cement scaffold by using a low-temperature 3D printing technology, and belongs to the technical field of biomedical materials. The method comprises the following steps: adopting a coaxial nozzle to extrude shell ink containing silk fibroin, alginate and bioactive ceramics and a sacrificial core ink to a low-temperature platform with a gradient distribution of temperature; after the formed frozen core-shell structure silk bundle is subjected to freeze drying, the silk bundle is immersed into a calcium ion solution, so that the elution and removal of the sacrificial core are realized synchronously to construct mesopores, and the ion crosslinking of the alginate is realized to enhance the structure; and finally, the final solidification is completed through mild ethanol vapor treatment. The application can construct a three-level biomimetic pore structure with macropores, mesopores and gradient micropores, and the prepared scaffold has excellent structure controllability and mechanical properties.

This invention provides a multi-material directional energy deposition additive manufacturing method and system. The method includes: a host computer slicing a 3D digital model with boundary representation and material property information to obtain the coordinate information of the model boundary surface and model voxels in 3D space, as well as the corresponding material property information; the host computer identifies the material property information, determines whether the required raw material is a single material or a combination of multiple materials, and selects the powder feeding mode of a multi-channel intelligent powder feeder; the identified material powder is added to the multi-channel intelligent powder feeder; the host computer converts the material property information and coordinate information into dynamic material commands that drive the multi-channel intelligent powder feeder and heat source to supply and melt different material powders, and multi-axis motion path information that drives the laser powder coaxial nozzle and positioner to coordinate the motion to complete the real-time dynamic deposition of materials with different properties in 3D space. This method breaks through the limitations of traditional formats and significantly improves material switching and component control capabilities.

The invention discloses a copper-aluminum dissimilar metal multi-process coupling laser welding strengthening method which is characterized in that in-situ coordination of welding, stress inversion, targeted strengthening and closed-loop repair is realized by integrating a three-layer coaxial nozzle end effector, a composite laser source and a digital twin system; synchronously stabilizing the temperature of the welding pool at 2200-2500K through PID (Proportion Integration Differentiation) closed-loop control; after welding, residual stress and IMC distribution are inversed based on a digital twin heat-force coupling model, and a targeted impact path is generated; switching short pulse laser to combine with a constraint water film to realize impact strengthening, introducing + 800-+ 1200 MPa residual compressive stress, and inducing a nanocrystalline structure; and finally, through hot nitrogen transient drying and ultrasonic closed-loop repairing, joint manufacturing is completed. According to the method, the process period is shortened, the joint tensile strength is improved, and the problems of excessive brittle phases, stress degradation and low efficiency of traditional copper-aluminum welding are effectively solved.

The invention discloses coaxial extrusion type 3D printing hydrogel equipment and application, and belongs to the technical field of 3D printing and geotechnical engineering supporting. Comprising a step-shaped shrinkage structure arranged at an inlet of an outer layer channel of a coaxial spray head and used for uniformly distributing a calcium chloride crosslinking solution and stably and uniformly wrapping an outer layer material; the size compensation factor calculation module is integrated in the control unit and is used for calculating and applying a size compensation factor in real time based on the linear shrinkage rate in each direction of the material and the slicing error so as to realize dynamic precision correction of a printing path; the device further comprises a three-axis mechanical arm control system, a two-way independent precise feeding system and a storage device. Through cooperation of a flow guide part and dynamic compensation, the uniformity, the structural consistency and the forming precision of hydrogel printing are remarkably improved, and the method is particularly suitable for high-precision and high-reliability temporary filling and supporting of complex surrounding rock cracks.

The invention discloses a preparation device and a preparation method of a dielectric-active integrated super-stretching transistor, and belongs to the technical field of advanced manufacturing. The device comprises a high-voltage power supply, two micro-injection pumps, a coaxial spray head and an X-axis and Y-axis movement module. The preparation method comprises the following steps: firstly, sequentially preparing the hydrophobic layer, the source-drain electrode, the dielectric layer, the grid electrode and the substrate on the substrate, and then stripping and reversing to form a to-be-jet-printed sample; then, a coaxial electrofluid jet printing technology is utilized to enable a polymer semiconductor functional layer material and a high-viscosity packaging layer material to form coaxial jet flow, and a winding wrapping structure is directly printed on the sample; and finally, standing and curing to enable the functional layer to be in contact with the source and drain electrodes to form a conductive path. The core of the invention lies in that the micro-nano patterning and in-situ packaging of the semiconductor layer are realized at one time through coaxial jet printing, the packaging layer, the dielectric layer and the substrate are made of the same material, a sandwich structure without interface stress is formed, the tensile strain capacity (up to 200%), the air stability and the preparation success rate of the device are greatly improved, and the manufacturing cost is reduced. The technical bottlenecks of transfer printing damage, patterning difficulty, interface problems, environmental sensitivity and the like in the traditional process are solved.