185results about How to "Improve cavitation performance" patented technology

The invention discloses a shaftless driven type integrated motor propeller which is arranged on the tail part of a boat body of a water vehicle or underwater vehicle and comprises a front stator, a rotor propeller and a rear stator which are serially arranged on a solid non-rotating shaft, wherein the periphery of the propeller is connected with the circumferential rim of the annular propeller, a rotor permanent magnet is embedded in the circumferential rim of the propeller, a stator winding is arranged in the inner cavity of a guide pipe, the rotor permanent magnet and the stator winding are sealed by adopting water, and a gap is arranged between the rotor permanent magnet and the stator winding to form an annular motor. The rotor permanent magnet and the stator winding as well as the guide pipe are organically combined to form a modular unit, thus the shaftless driven type integrated motor propeller can be easily installed on a water platform or underwater platform, is suitable for large-power main propelling of a water boat or underwater submergible device, and has the advantages of reasonable structure, high propelling efficiency, low hydrodynamic force radiation noise, excellent cavitation property, safety and reliability.

The invention discloses a method for forecasting numerical value of cavitation of an underwater propeller tip vortex and belongs to the field of optimized design of propellers. The method includes steps of (a) determining a basic grid; (b) determining a precision grid; (c) determining an optimal grid; (d) forecasting the cavitation of the underwater propeller tip vortex under the required working condition by means of the optimal grid. The method is used for forecasting the numerical value of the cavitation of the propeller tip vortex, and effectively forecasts tip-vortex cavitation of the E779A type propeller under different working conditions via comparison of results of related experiments, therefore, the method is of great significance in forecasting and evaluating of cavitation performance in the propeller design, design cost and period are effectively reduced, and the method is quite good in application prospect.

The invention discloses a fused ring compound, which has a structure shown as a formula (I) or a formula (II). The effective conjugation of aromatic rings and heterocyclic rings is controlled in the fused ring compound; the hole performance is improved; meanwhile, the electronic transmission performance is favorably balanced; the compound has high triplet state energy level and glass transition temperature; material molecules cannot easily crystallize; when the fused ring compound is used as a luminescent layer host material, the efficient transfer of energy to guest materials can be guaranteed. The substituent group of the fused ring compound is regulated, so that the electron and hole transmission performance is further improved; the singlet state and triplet state energy level difference is reduced; the compound region of carriers is expanded; the triplet state exciton annihilation is prevented. The invention also discloses an organic electroluminescence device; at least one function layer contains the fused ring compound; the fused ring compound is used as the host material of the luminescent layer and is matched with the adjacent carrier transmission layer energy level; the luminous efficiency of the device is improved; meanwhile, the driving voltage of the device is reduced.

The ejector capable of raising the cavitation performance of centrifugal pump includes successively ejecting inlet, mixing section, diffusion section and ejecting outlet. There are annular cavity around the ejecting inlet, ejecting interface on the annular cavity, several axial inclined ejecting nozzles in axial angle of 10-45 deg distributed homogeneously on the side wall of the annular cavity. Or, the ejecting interface has axial straight ejecting nozzle connected with the ejecting direction coincided with the central axis of the ejector. For high speed centrifugal pump, combined structure of inducing wheel and ejector is adopted, and for common centrifugal pump, ejector is adopted directly in obtaining optimal cavitation performance. The centrifugal pump with ejector may be used in conveying acids, alkalis, salts, alcohols, medicine solution and other liquid medium containing solid particle in the temperature of ¿C200 to +400 deg.c, especially those with strict cavitation performance requirement.

This invention discloses an automatic air device reducing vapor-corrosion vibration and noises of jet pumps including a pressure sensor, a PLC controller, a contactor, a master intake pipe, a normal-open valve and an electromagnetic valve, in which the PLC controller includes CPU and A/D and DO connected with it and a supply module.

The invention relates to an inducer designing method based on a centrifugal pump, which belongs to the technical field of pumps. The method is characterized in that an inducer is designed based on a given centrifugal pump device. According to the inducer designing method based on the centrifugal pump, the inducer is designed by determining the flow, the pump lift, necessary net positive suction head and other experimental data at a point of the centrifugal pump with the highest efficiency, based on an external characteristic experiment according to the conditions of an existing water pump device. Consequently, the inducer acquires higher cavitation specific speed under the conditions of an outer diameter of a rim, inlet hub ratio and optimal inlet flow coefficient. Not only can the inducer be enabled to have good cavitation performance, but also the inducer has good energy matching relationship with a pump impeller, the performance of the inducer is improved, the operation stability of a system is enhanced, assembly difficulties caused by size difference between the pump and the inducer due to an original designing method can be prevented, the inducer designing efficiency is improved, and popularization value is realized.

The invention relates to a hydraulic cavitation sewage treatment device, in particular to a choking cavitator for treating organic sewage. The choking cavitator is characterized by comprising an inflow joint, a nozzle body, a choking body and a back pressure cover, wherein the nozzle body is matched with the choking body, so that an annular nozzle is formed; a choking pipe is arranged in the choking body; the choking body is matched with the back pressure cover, so that a collapse cavity is formed; and a back pressure hole is formed radially on the back pressure cover. The choking cavitator is designed according to the chocking phenomenon of gas-liquid two-phase critical flow, sewage is jetted into the choking pipe in the choking body through the annular nozzle for generating air bubbles,a choking section is formed close to the outlet of the choking pipe, and air bubbles are collapsed in the back pressure cover after passing through the choking section. The choking cavitator has the characteristics of simple structure, large quantity of air bubbles, high cavitation strength, high organic sewage treatment capacity, high energy utilization ratio, freeness from secondary pollution and the like, and is particularly suitable for treating non-degradable toxic and organic pollutants.

The invention discloses a self-excited oscillation cavitation impinging stream reactor which comprises a liquid inlet pipe, a gas inlet pipe, a cavitator, an impact cavity and a liquid outlet pipe. Apipe connector is mounted on an upper cover plate and used for being connected with the liquid outlet pipe and allowing a liquid to flow out; a water inlet pipe and a flange plate are connected through threads, and the distance between outlets of the self-excited oscillation cavitator can be changed by adjusting the screwing length of the threads. The water inlet pipe is in threaded connection with a self-excited oscillator. The self-excited oscillation cavitator is located in the impact cavity, liquid enters the self-excited oscillation cavitator through the liquid inlet pipe, cavitation is generated, cavitation jet flow is formed, multiple strands of liquid jet flows collide with one another at a high speed in the center of the impact cavity, and cavitation is effectively enhanced; meanwhile, plasma can be introduced into the cavitation process, and the generation efficiency of hydroxyl radicals is improved. The reaction process can be strengthened, the hydrodynamic cavitation strength is improved, and the degradation efficiency of organic wastewater is improved.

The invention discloses a hydraulic cavitation part of a micro bubble generator and a clothes treatment device. The hydraulic cavitation part of the micro bubble generator comprises a cavitation shelland a cavitation sphere, wherein a water passing cavity is arranged in the cavitation shell, the cavitation shell is provided with a cavitation inlet and a cavitation outlet which communicate with the water passing cavity, the water passing cavity is a closed cavity which only flows through the cavitation inlet and the cavitation outlet, and the cavitation inlet is suitable for inflow of water flow with dissolved gas; the cavitation sphere is movably arranged in the water passing cavity, under the pushing of water flow flowing in from the cavitation inlet, the cavitation sphere can be stoppedagainst the inner wall, with the cavitation outlet, of the water passing cavity, and when the cavitation sphere is located at the cavitation outlet for blocking, a cavitation channel communicating with the cavitation outlet is arranged between the cavitation sphere and the inner wall of the water passing cavity. The hydraulic cavitation part of the micro bubble generator provided by the embodiment of the invention is simple in structure and capable of generating a large amount of micro bubbles.

The invention provides an efficient contra-rotating axial flow pump. The efficient contra-rotating axial flow pump comprises a front impeller, a rear impeller and a double-rotor contra-rotating motor,wherein the front impeller is connected to an outer rotor shaft of the double-rotor contra-rotating motor, and the rear impeller is connected to an inner rotor shaft of the double-rotor contra-rotating motor; and the front impeller and the rear impeller are opposite in rotation directions, and the front impeller and the rear impeller have the same wheel edge diameter D and hub diameter dh. According to the efficient contra-rotating axial flow pump, the efficient contra-rotating axial flow pump is reasonably optimally designed on the basis of an original axial flow pump impeller design methodand according to the structure properties and the flowing condition of the contra-rotating axial flow pump, and particularly wing shaped mounting corners at the coupling flowing positions at the frontimpeller and the rear impeller of the contra-rotating axial flow pump are subjected to reasonable flowing setting, so that the hydraulic efficiency of the contra-rotating axial flow pump is improved.

The invention discloses a production method of high-quality instant rice, belonging to the technical field of food processing. The method is based on the principle of strong absorption of alcohol water vapor to lipid and moisture (including combined water) in rice, permeation and dissolving promotion of a magnetic field, and cavatition and uniform drying effect of infrared rays with intermediate waves, and can be used for improving the rehydration and preservation performance of the instant rice. The production method mainly comprises the process steps of selecting normal rice as raw materials, immersing at 40-50 DEG C for 25-35 minutes, cooking for 25-30 minutes, adding an aqueous solution of ethanol for dispersion, filtering, braising the rice for 15-20 minutes, drying by alcohol water vapor under a magnetic field of 6000-6500 GS till the water content of the rice is 8%-10%, and drying with infrared rays with the wavelength of 2-4 microns till the water content of the rice is 4%-5%. The instant rice is good in mouthfeel and excellent in rehydration and preservation performance.

The invention discloses a volute type centrifugal pump with a movable guide vane. According to the volute type centrifugal pump with the movable guide vane, a rectifying grid is arranged at an outletof a suction elbow pipe, so that the energy loss of fluid at an inlet of a flow channel is reduced, the cavitation performance is improved, and vibration and noise are reduced. The movable guide vanestructure of the volute type centrifugal pump with the movable guide vane is arranged between an impeller outlet and a volute inlet, the angle of the guide vane can be adjusted according to differentworking conditions, and the flow at the impeller outlet can be rectified under different working conditions, so that the influence of unbalanced force is reduced, and the operation stability of a large unit is improved. Moreover, the structure is beneficial to reducing the impact loss caused by the fact that the water flow impacts the guide vane when the liquid flow at the impeller outlet enters the guide vane, so that the efficiency of the large centrifugal pump is improved.

The invention relates to a pump type optimized design method based on water pump characteristic three-dimensional spatial patterns of a pump station. The pump type optimized design method comprises the following steps: step (1) carrying out regression on characteristic parameters of a plurality of water pumps by adopting a moving least square method to form a plurality of water pump characteristic three-dimensional spatial pattern curved surfaces; step (2) selecting the optimal water-pump pump type according to the plurality of water pump characteristic three-dimensional spatial patterns and characteristic lift of the pump station; and step (3) determining various parameters of the optimal water-pump pump type. According to the pump type optimized design method, the three-dimensional spatial patterns are adopted for expressing the performances of the water pumps, so that straight comparison for the performances of the water pumps is convenient, and the water pump with the optimal specific speed, a water inlet runner type and a water outlet runner type are conveniently selected; and water pump prototype device performance predication can be carried out according to the water pump model device characteristic test results which are carried out according to the selected water pump, the water inlet runner type and the water outlet runner type to serve as the main component content of engineering design, so that operation and management of pump station engineering construction are guided, and the needs of practical application can be met very well.

The invention discloses a compound cavitation cleaner for pipe descaling and with a two-grade resonance function. The compound cavitation cleaner comprises a blade cleaning structure and a Helmholtz cavitation nozzle; the blade cleaning structure and the Helmholtz cavitation nozzle are connected as a whole through upper and lower self-locking nuts; the Helmholtz cavitation nozzle consists of an inlet cavity, an upper nozzle outlet, a resonance cavity and a lower nozzle outlet; the diameter ratio of the lower nozzle outlet to the upper nozzle outlet is 1.2-2.3; the diameter ratio of the resonance cavity to the lower nozzle is 6-9; and the ratio of the length of the resonance cavity to the diameter of the resonance cavity is 0.5-0.7. The Helmholtz cavitation nozzle can amplify water current shock waves of the upper nozzle outlet through the resonance cavity, and water can be returned after flowing to the lower nozzle outlet, so that higher shock waves are generated to clean pipes, and the better cavitation effect is achieved. The equipment structure is adopted to generate the hydraulic cavitation effect; and the compound cavitation cleaner has the characteristics of simple equipment, convenience in operation and lower cost.

The invention discloses 3D printing metal powder and a preparation method thereof and relates to the technical field of metal materials. The 3D printing metal powder disclosed by the invention adoptstitanium alloy powder, nickel powder and chromium powder which are different in particle size and proportion as raw materials; ultrasonic water atomization is adopted for preparing the metal powder; the high frequency of ultrasound is beneficial for achieving a cavatition effect in molten metal so that the molten metal is uniformly split into small liquid drops; the preparation method is combinedwith a water atomization method; on one hand, the relatively large specific heat capacity and the high cooling speed of water are beneficial for industrial large-scale production; on the other hand, water is used as a medium, which is beneficial for reducing the generation rate of hollow powder and satellite powder; the prepared powder is good in compression formability; the strength of a printedfinished product is enhanced; meanwhile the final annealing treatment reduces the oxidization effect of oxygen in water to metals; and the overall preparation method is simple and is low in energy consumption.

The invention discloses a parallel type self-balancing multi-stage centrifugal pump. Due to the fact that impellers are symmetrically arranged in a pump body in a back-to-back mode, self balancing of the impellers in the axial direction is achieved, mechanical friction generated by axial force in the rotation process of the multi-stage centrifugal pump is reduced, and service life of the centrifugal pump is prolonged. Due to the fact that a balancing structure is removed from the centrifugal pump, wearing parts are few, leakage losses are small, safety and reliability are high, and maintaining is easy.

The invention discloses a radially split double-shell multiple-stage centrifugal pump. The centrifugal pump comprises a pump barrel, a pump cover, a core cladding, a balance pipe and a bearing part, wherein an outlet pipe and an inlet pipe are arranged on the pump barrel; the core cladding comprises a suction section, a middle section, an intermediate section, a radial guide blade, a first stage impeller, a secondary stage impeller and an axis, the core cladding is radially split and can be put in or pumped out from one end of the pump as a whole; the first stage impeller is a double-suction impeller; the secondary stage impeller is a single-suction impeller. The pump in the structure disclosed by the invention is compact, convenient to repair, good in cavitation property and high in reliability, the axial force is automatic balancing.

The invention belongs to the fields of pulp pretreatment technologies and equipment before flotation, and discloses a flotation pulp-mixing method and flotation pulp-mixing equipment capable of improving a mineralization effect. The equipment has a function of simultaneously realizing pressurization/decompression and mechanical stirring, and can flexibly adjust the gas holdup in pulp, therefore, an equipment support is provided for studying the influence of the gas holdup on cavitation; specifically, the concentration of gas, namely the gas holdup, in the pulp is adjusted in real time to improve the cavitation effect, promote the agglomeration among fine particles, and increase the apparent diameter so as to increase the collision probability of the fine particles and bubbles during the flotation process, and improve the mineralization effect. Specifically, the gas holdup in the pulp is adjusted by pressure regulation, and the gas holdup in the pulp is controlled at 5% to 40%, and theconcentration of the gas in the pulp is reasonably increased, thereby facilitating the occurrence of the cavitation, promoting the agglomeration among the fine particles and increasing the apparent diameter, improving the collision probability of the fine particles and the bubbles in the flotation process, and improving the mineralization effect.