10results about How to "Improve rectification effect" patented technology

The invention provides a grid design method, which comprises the following steps of: selecting linear spokes and / or arc-shaped spokes according to the distribution condition of an incoming flow velocity field; matching design is conducted on the two-dimensional spoke section, the installation angle of the spoke and the incoming flow angle of the airflow, the resistance coefficient and the airflow deflection angle serve as evaluation indexes, and then the obtained spoke section is recarved to a three-dimensional model; according to the distribution condition of a flow field in the air duct, the distance between the spokes is designed, the distribution condition of the flow field in the air duct is judged, when the airflow speeds of the upper side and the lower side in the air duct are different, the transverse spokes are densely arranged, and when the airflow speeds of the left side and the right side in the air duct are different, the longitudinal spokes are densely arranged; the spokes are arranged in the three-dimensional model according to the designed spoke spacing, and the optimization design of the shape of the whole grating is completed. According to the invention, the technical problem in the prior art that the rectification effect of the grating is poor when the incoming flow velocity of the airflow is not uniformly distributed can be solved.

This invention discloses a porous rectifying structure for the afterburner of a variable cycle engine, comprising a rectifying orifice plate installed in an annular channel between the turbine outlet and the flame stabilizer. The orifice plate is symmetrically arranged along its radial central axis, with the clogging area facing the turbine inflow and axially aligned with the heat shield inlet. The orifice plate height is 2 / 3 of the channel height between the central cone and the heat shield. The plate has uniformly distributed pores with an equivalent diameter of 10-20 mm along the radial direction, with a clogging ratio of 5%-25%. This invention forms a multi-stage mixing interface through the radially gradient porosity pore arrangement, promoting shear mixing of the high-temperature internal combustion gas and the external bypass gas. Simultaneously, the static pressure difference across the orifice plate drives the external bypass gas flow into the heat shield cooling channel, increasing the cooling flow rate, improving the uniformity of the upstream velocity field of the flame stabilizer, eliminating the recirculation zone inside the heat shield, reducing the thermal load on the casing wall, and controlling the total pressure loss to within 3%, achieving high-stability combustion and reliable thermal protection under a wide bypass ratio.

The invention discloses a V-shaped hollow sill arrangement method for a lateral water distribution pool, which comprises the following steps of: determining the water level and the flow velocity of inlet incoming water, and calculating the Froude number Fr of the inlet; a plurality of incoming flow conditions are simulated through numerical values, and the comprehensive outlet uniformity is calculated according to the lateral diversion outlet section of the water diversion pool; fitting the data scatter curve to obtain a single-peak function curve of the lateral outflow uniformity along with the change of the angle of the diversion side sill under each incoming flow condition, and recording the peak value of the curve; obtaining an exponential growth curve function of a lateral outflow uniformity peak value changing along with Froude number under each incoming flow condition; and obtaining and adjusting the divergence angle of the sill diversion side based on the determined Froude number. The variable-angle V-shaped sill is arranged according to different incoming flow conditions, so that the variable-angle V-shaped sill is suitable for various incoming flow working conditions, the construction cost is reduced, and the hub income of the diversion gate station is improved.

The utility model relates to the technical field of fan equipment, and provides a blade, a fan and an air conditioning system. The blade comprises a blade body, the front edge of the blade body forms a front edge curve, the front edge curve comprises a front convex section and a flat section, the front convex section is located on the side, close to the blade tip of the blade body, of the flat section, and the middle of the front convex section protrudes towards the front side of the blade body. The special structures of the front convex section and the flat section in the front edge curve have a good rectification effect on inlet turbulent flow groups, non-uniform flow is limited in a small forward swept area at the top of the blade, acting of the middle area of the blade is basically not affected, and a draught fan still has high aerodynamic efficiency under the condition that the inlet is shielded.

The utility model discloses an integrated small turbojet engine combustion chamber, and belongs to the technical field of turbojet engine flame tubes. Comprising an outer flame tube and an inner flame tube fixedly connected with the outer flame tube through a head plate, and an annular fuel oil atomization evaporation tube is arranged between the inner flame tube and the outer flame tube and fixedly connected with the outer flame tube; the annular fuel oil atomization evaporation pipe comprises a wheel disc connected with the outer flame tube, a plurality of curved spray pipes are evenly arranged on one side of the wheel disc, and two oil inlet nozzles are symmetrically arranged on the other side of the wheel disc. The projection of a nozzle of each curved spray pipe on the wheel disc coincides with an inlet of the second curved spray pipe rotating anticlockwise, and the nozzles are designed to be flat. According to the integrated small-sized turbojet engine combustion chamber adopting the structure, the combustion reliability and the combustion efficiency are improved, a good rectification effect on vortex is achieved, meanwhile, an oil needle is directly omitted, disassembly is easier, and the blockage problem is avoided.

The rectifying assembly comprises a plurality of stacked net elements, each net element comprises an annular support and a net plate which are integrally formed, the thickness of each annular support is larger than that of each net plate, a gap is formed between every two adjacent net plates, and a plurality of overflowing holes are formed in each net plate in an array mode. A positioning protrusion is arranged on one side wall of the annular support, a positioning groove is formed in the corresponding position of the other side wall of the annular support, and the positioning protrusion of one net element is embedded into the positioning groove of the other net element so that the adjacent net elements can be assembled and fixed. The structures of all the net elements in the rectification assembly are the same, that is, only one part is needed, a proper number of net elements are selected and stacked according to actual needs, and a good rectification effect can be achieved; by pressing the adjacent annular supports, the adjacent net elements can be assembled and fixed, special jigs and equipment do not need to be designed, the assembling cost is low, the assembling mode is simple, the assembling efficiency is high, and connection is stable and reliable.

The utility model discloses a fiber filament evenness rectifying device convenient to scrape, which comprises a working table and a supporting table, the supporting table is mounted at the bottom end of the working table, a protective cover is mounted at the top end of the working table, and a protective cover is mounted on one side of the top end of the working table. The driving motor drives the driving shaft and the movable gear to rotate, the movable gear and the toothed plate are meshed with each other, so that the movable gear can transversely and horizontally move along the connecting plate and drive the movable frame to synchronously move, the guide column is used for supporting and guiding in the process, and the godet and the yarn dividing scraper blade can be driven to synchronously move. The filament dividing scraper can be used for carding fiber filaments produced from the filament outlet machine, the fiber filaments can be carded into finer filament bundles, and the filament bundles are more uniform and consistent, so that the rectification effect is improved, and mutual winding of the fiber filaments can be avoided.

The invention relates to the technical field of switches, in particular to a conversion circuit of a flyback DC-DC converter, which comprises a rectification input filter circuit, a PD detection circuit, a flyback DC-DC conversion circuit and a sampling feedback voltage stabilizing circuit, and is characterized in that the rectification input filter circuit is connected to the input end of the flyback DC-DC conversion circuit; the PD detection circuit comprises a PD detection resistor R1, and the PD detection resistor R1 is connected in parallel between the rectification input filter circuit and the flyback DC-DC conversion circuit. The device is ingenious in design, can adapt to different PSE equipment wiring modes, and is good in rectification effect and high in stability. Through cooperation of the PD detection circuit and the sampling feedback voltage stabilizing circuit, it can be ensured that PD equipment can stably and reliably receive power supply from PSE equipment, and the power supply management circuit is very suitable for power supply management requirements in PoE application.

The present application relates to water meter equipment technical field, especially relates to a kind of ultrasonic water meter structure for realizing U0D0 installation environment, and the ultrasonic water meter is DN20 ultrasonic water meter, and the one end of DN20 ultrasonic water meter is connected with DN20 ball valve, the inside of DN20 ultrasonic water meter is equipped with the whole of movement, and the cross section of the internal flow passage of movement is multi-arc line structure.The beneficial effects of the present application are:the flow passage structure of the multi-arc combination designed in the present application can realize the U0D0 installation of ultrasonic water meter, and numerical simulation analysis can prove that the influence caused by ball valve disturbance when the ball valve opening of the present application is 30 ° is below 1%, and the pressure of U0D0 water meter can be reached, and the influence of the ball valve of 30 ° opening of the present application on measurement accuracy is 2.96%, by comparing with conventional circular flow passage structure, it is confirmed that the anti-disturbance effect of the multi-arc structure of the present application is obviously improved, and has good rectification effect.

The application discloses a double-layer noise reduction air guide ring, which comprises an inner air guide ring layer and an outer air guide ring layer. The inner air guide ring layer comprises a circular ring segment, a mounting panel, an inlet flow guide segment and an outlet diffuser segment. The inlet flow guide segment and the outlet diffuser segment are fixedly connected with the two ends of the circular ring segment respectively. The inlet flow guide segment is in a circular arc shape. The mounting panel is fixedly connected with the side of the inlet flow guide segment, which is away from the circular ring segment. The outer air guide ring layer comprises a flat segment, a circular arc segment and a partition plate. The end of the circular arc segment, which is close to the inner air guide ring layer, is provided with an outer layer outlet end. The end of the circular arc segment, which is away from the inner air guide ring layer, is provided with an outer layer inlet end. The mounting panel and the flat segment are provided with a connecting structure. The partition plate is provided with a plurality of partition plates. The resonant cavities between the adjacent partition plates are different in size. The application further discloses a fan comprising the double-layer noise reduction air guide ring. The application has the advantages of high fan efficiency and low air inlet noise.