172 results about "Evanescent mode" patented technology

In one aspect, the present invention includes a voltage controlled oscillator comprising an active device having a plurality of resonators coupled across two terminals of the device and at least one resonator coupled across the plurality of resonators. The at least one resonator preferably operates as an evanescent mode buffer capable of storing a select amount of energy present in the oscillator.

A tunable filter having an electronically tunable center frequency and dynamic bandwidth control over a large tuning range. High-Q continuously tunable evanescent-mode cavity resonators and filters using reliable RF MEMS actuators. One embodiment is a 3.4-6.2 GHz (1.8:1 tuning ratio) continuously tunable electrostatic MEMS resonator with quality factor of 460-530, with a volume of 18×30×4 mm including the actuation scheme and biasing lines. A tunable resonators is also disclosed with a 2.8:1 (5.0-1.9 GHz) tuning ratio, and Q of 300-650.

The invention discloses an evanescent mode pouring system of a speed changing box body. The evanescent mode pouring system is provided with a sprue, wherein the sprue is sequentially communicated with a pouring cup, a first cross gate and a second cross gate from top to bottom, and the first cross gate and the second cross gate are respectively communicated onto the sprue along the radial direction of the sprue; the end part, away from of the sprue, of each of the first cross gate and the second cross gate is respectively provided with a first inner gate pouring port and a second inner gate pouring port. The pouring system is adopted for pouring a casting, so that the mold filling time is shortened, and the heat loss is reduced; moreover, the shrinkage porosity and cavity weakness can be greatly reduced, and the casting quality can be effectively improved.

The invention discloses a determination method for an interface heat transfer coefficient in a casting process. The determination method for the interface heat transfer coefficient in the casting process comprises the following steps that K type thermal couples with the diameter being 0.1 mm-0.5mm are arranged on the positions, 1 mm-5mm away from the cast mold surface, of a cast mold and a cavity respectively, the K type thermal couples are inserted into one end in the casting mold and one end in the casting mold cavity and protected by ceramic tubes with the diameter being 2.0 mm-10 mm, and the other ends of the casting mold and the casting mold cavity are connected to a computer; the interface heat transfer coefficient of a casting piece in the process of cooling and solidfication can be obtained by using a heat transfer recognition software according to the temperature changing data of casting piece measuring points and casting mold inner measuring points. The injection mold cold runner casting system structure is suitable for special casting processes including sand casting, die casting, evanescent mode casting, metal mold casting and pressure casting for aluminium alloy, steel, iron and other different materials.

The invention discloses powder evanescent mode casting paint and an application method thereof. The powder paint comprises the following components in percentage by weight: 88.9-89.7% of refractory aggregate, 3.7-4.5% of sodium base bentonite, 0.78-1.23% of polyethyl alcohol, 0.82-1.85% of aluminum dihydrogen phosphate, 0.32-0.44% of sodium carboxymethylcellulose, and 3.8-4.8% of expanded graphite. During preparing, all powder is added in a mixer for dry mixing to reach an uniform state to obtain the finished powder evanescent mode casting paint. Water by 23.5-37 weight% of the powder paint is firstly added in the mixer; the mixer is started; the powder paint is slowly added in the mixer; after materials are added, the stirring is continued by 1-2 hours; and then, an evanescent mode can be coated by the paint. The paint can achieve the effect of long-time storage without deteriorating by adding no formaldehyde in the raw materials; no surface active agent is added in the raw materials to prevent the trouble of adding a defoaming agent to defoam in subsequent use; the finished product is higher in strength at normal temperature or high temperature; and the paint is excellent in permeability, and cannot release poisonous substances.

The invention discloses an evanescent mode coating spraying system which comprises a storage vat (1), a motor (2), a motor bracket (3), a stirring impeller (4), a feed delivery pipe (5), a return pipe (6), a connecting pipe (7), an output pipe (8), a feedback pipe (9), an air pipe (10), a pneumatic diaphragm pump (11), a magnetic filter (12), a first control valve (13), a second control valve (14), a third control valve (15), a fourth control valve (16), a spray pipe (17), a storage tank (18), a crown block (19), a lifting frame (20), a mounting rack (21), an evanescent mode coating (22), a mesh enclosure (23) and a fifth control valve (27). The evanescent mode coating spraying system has the advantages and effects that: during the evanescent mode coating process of the system, manpower and material resources as well as time are saved, the coating is uniformly coated, and cannot be limited by an evanescent mode structure, and deformation during the evanescent mode coating process is avoided.

The invention provides a 3D printing forming casting method for a large-scale complex thin-wall high-temperature metal component. The method comprises the data acquisition process, the process designand forming and simulation optimization pouring process, the SLS wax model 3D printing process, the casting system evanescent mode foam forming process, the process gating system assembling and shellmaking process, the roasting and demolding process, the vacuum casting process, the pressurization solidification process, the metal component cleaning process, and grinding and polishing process. According to the casting method, the advantages of the 3D printing process, the investment casting process, the evanescent mode casting process are combined, so that a reliable technical scheme is provided for rapid preparation of the large-scale complex thin-wall high-temperature metal component; the problems that the air permeability is poor, the feeding distance is insufficient are solved by adopting the vacuum pressurizing pouring process; and the production period of the large-scale complex thin-wall high-temperature metal component is shortened from 1-3 months to less than 10 working days,and rapid production of the large-scale complex thin-wall high-temperature metal component is realized.

The invention discloses a casting technique of a V12-type engine cylinder block. The casting technique comprises the following steps of: manufacturing a foam model, modeling under vibration, pouring under vacuum and cooling and cleaning, wherein a sand mould is subjected to air exhaust during a pouring process and before and after the pouring step, an air exhausting pipeline is arranged at the lower end of the sand mould, an iron pillow for dispersing force is arranged on a pouring cup, a layer of water glass sand is coated on a film, a vibrating platform is started before pouring, and a sand box can continuously vibrate in the pouring process. The V12-type engine cylinder block with a complicated structure is manufactured by adopting an improved evanescent mode casting technique and a vibrating-while-pouring compact strengthening casting method, shape-position dimensional accuracy and internal-external surface quality of the V12-type engine cylinder block are further improved by the allowance-free and accurate forming evanescent mode technique, an ideal compact organization structure is obtained by virtue of the vibrating-while-pouring compact strengthening casting method, and the performance of the V12-type engine cylinder block can be guaranteed and improved.

The invention discloses a WCp/EPS evanescent mode pattern and a WCp/Fe composite evanescent mode cast forming process, and belongs to the technical field of metal forming. A preparation method of theWCp/EPS evanescent mode pattern includes the following steps that WC particles, rare earth powder, EPS beads and an adhesive are weighed by volume parts and mixed to be uniform, and a mixture is prepared; a die is preheated, and when the temperature of the die reaches the working temperature of 100 DEG C, filling is started; the die is filled with the mixture through compressed air, and hot steamis introduced; and after the hot steam is relieved, water is sprayed to the back face of the die for cooling, the temperature of the pattern is rapidly cooled to 40-50 DEG C, the temperature is reduced below the softening temperature, and after the pattern is shaped, the die is stripped. According to the process method, alloy particles and a substrate are firmly bound, the particles are uniformlydispersed, the comprehensive mechanical performance of the product is improved, and large WCp/Fe composite parts with complex shapes can be manufactured through evanescent mode casting.

The invention belongs to the field of metal casting, and discloses an evanescent mode casting technology. The technology comprises the following steps: producing a foam mode sample or a pouring system with a metal foaming mold in a shaping machine; cementing the mode sample and a pouring channel to form a mode truss module; soaking water-based paint on the mode truss module with a coating machine; stoving the paint, and drying the stoved mode truss module with an air exhauster in a stoving chamber; putting the dried mode truss module into a sand box, and filling dry sand; performing vibration molding on a swing table so as to fill the dry sand into the lumen of the sand box and compact the dry sand, sealing the sand box with a plastic film, and placing a pouring cup; performing pouring so as to gasify and disappear a foam mode sample in the sand box to form a cast, and pumping air in a vacuum manner during the pouring; after the cast is cooled, taking out the cooled cast, performing shakeout and cutting out and cleaning a pouring head. The technology has the advantages that the cost is reduced, the property is steady, and the efficacy is high.

A waveguide filter with a signal input port at a first end and a signal output port at a second end includes a dielectric core of moldable material where the outer surface of its periphery has a metal layer with nonmetallized openings positioned at opposite ends of the filter to accommodate the input and output ports. The filter's periphery is configured to provide a cascade connection of a plurality of metal-bounded ridge-waveguide sections with interspersed metal-bounded evanescent-mode coupling regions. The filter can be joined through a manifold to realize a frequency-multiplexer, with the manifold containing a cascade connection of electrically short waveguide segments and quasi-lumped waveguide circuit components, such as irises. The filter and multiplexer are amenable to the application of cost-effective injection molding techniques to manufacture the dielectric core.

A new type of microwave applicator has been disclosed. The applicator according to an embodiment of the invention makes use of an evanescent main power-transferring mode. This evanescent mode is complemented by a second mode, which is a propagating mode that has the purpose of providing a counter-directed magnetic field in the y-direction at the horizontal, y-directed applicator wall opening. The effect of the cooperation of the two applicator modes is that the field pattern extends over a significant distance below the applicator opening, such that a load placed below the applicator opening is heated by a field pattern of the mode combination.

The invention relates to an evanescent mode sand processing system, belonging to the field of an evanescent mode pouring technology. The evanescent mode sand processing system comprises a drum sand sieving machine, a vibration conveyor trough, a belt-type suspended magnetic separator, a heat-resistant bucket elevator, two intermediate sand bins, a dust removing device, a transitional sand hopper, a pneumatic conveyor, two sand hoppers above a swing table, and a rain-type sand feeder, wherein the vibration conveyor trough and the belt-type suspended magnetic separator are arranged at the rear side of the drum sand sieving machine; the heat-resistant bucket elevator is arranged at the rear sides of the vibration conveyor trough and the belt-type suspended magnetic separator; the two intermediate sand bins are arranged at the rear side of the heat-resistant bucket elevator; the dust removing device is arranged at the rear sides of the intermediate sand bins; the transitional sand hopper is arranged at the rear side of the dust removing device; the pneumatic conveyor is positioned at the rear side of the transitional sand hopper; the sand hoppers above the swing table are arranged at the rear side of the pneumatic conveyor; and the rain-type sand feeder is arranged at the rear sides of the sand hoppers above the swing table. The evanescent mode sand processing system is characterized by further comprising a programmable logic controller (PLC) system and a dust removing system; the dust removing device is a boiling bed cooling dust removing device and comprises a cold water circulating system and a high-pressure centrifugal fan; and a central sand bin is arranged between the transitional sand hopper and the pneumatic conveyor. Due to the dust removing device and the dust removing system, the evanescent mode sand processing system is good in effect, reasonable in design, convenient and reliable to control and use and high in working efficiency.

A multifunctional sand box for casting comprises box walls at the peripheries and a box bottom. Structural steels for strengthening are installed on the peripheries of the box walls, vertical separating boards are arranged in the sand box to separate the sand box into small sand boxes which are not communicated, and an independent vacuumizing interface is arranged on the lateral face or/and the bottom face of each small sand box. The separating boards are added in the sand box, so that the sand box is separated into the small sand boxes, and reasonable size of the small sand boxes can be adjusted according to different casting pieces. Each small sand box has the independent vacuumizing interface, air between small sand boxes is not communicated, an independent negative pressure system guarantees that negative pressure in the small sand boxes does not influence on others, the negative pressure can be adjusted according to different requirements, cast production manufacturers do not need customize large-size sand box in order to give consideration to manufacture different casting pieces, generality of a production line is improved, overlapping investment of the production line is effectively avoided, and an evanescent mode induction doorsill is reduced.

The invention discloses high-strength high-wear-resistant bainite cast steel used for a block cast middle groove, and a preparation technology thereof. The preparation technology comprises the following technical steps: preparing raw materials and evanescent modes, carrying out raw material hot melting, casting the evanescent modes, carrying out diffusion annealing preprocessing, carrying out caststeel salt bath quenching and tempering and detecting cast steel quality. The bainite cast steel used for the middle groove has the characteristics of high strength and high wear-resistant performance, the middle groove is subjected to integral casting forming, and the problem that all positions have inconsistent wear resistance is avoided. When a work surface is turned, maintenance is not required, the current work surface is directly turned to a next work surface, and the coal mining efficiency is improved. Meanwhile, since the materials of different positions are different, so that the effect of new goods are traded for old goods is realized, waste middle groove can be recovered and recast, waste is recycled, and the fully mechanized mining cost of users is greatly lowered, thus realizing an important meaning for the energy and material saving, the circular economy and the sustainable development of coal production.

Nano-particle based mode strippers for removing undesirable laser energy for laser systems. Nano-particle mode strippers having matched indices of refraction to the outer cladding remove cladding light converting it into heat. There are provided fibers having evanescent mode strippers having annular outer cores and claddings.

The invention relates to a spatial phase filter capable of receiving an incident light beam so as to transmit it to a single mode output fibre comprising a spatially variable phase profile and being adapted to excite the evanescent modes of the output fibre. The profile has:

• • an adjustable pattern with a phase distribution substantially corresponding to a combination of at least one quantile of normal distribution on at least one dimension (301); and
  • a phase shifting zone support (320) limited in relation to the incident beam according to the dimension(s). The invention also relates to a system implementing several filters and a method for filter calculating.

The invention belongs to the technical field of 3D printing, and discloses a method for preparing an evanescent mode by using a 3DP printing technology. The computer three-dimensional modeling is performed according to the structural shape and size of an evanescent mode to be printed, and a three-dimensional model is divided into two-dimensional sections; PMMA powder is flatly paved in a 3DP printing platform; a binding agent-liquid phenolic resin is sprayed on the PMMA powder plane according to section information provided by the two-dimensional sections to finish printing of one layer; the height of the printing platform is lowered by one layer; a layer of PMMA powder is continuously and flatly paved on the surface of the printed layer; then, the binding agent is sprayed; the powder pavement and the spraying are repeated like this; the layers are superposed; a semi-finished model is obtained after printing; redundant powder around the semi-finished model is removed; and then, the semi-finished model is dipped in molten paraffin by 15-30 min, and is taken out for airing to obtain the evanescent mode. The evanescent mode with high molding precision and low product shrinkage rate can be obtained by the 3DP printing technology within shorter time.