26results about How to "Flow field stability" patented technology

The invention relates to the technical field of pulverized coal separation, in particular to a cyclone separator, a pulverized coal separation system and a cyclone separator structure optimization method.The cyclone separator comprises an air inlet unit which comprises an air inlet assembly and a separation assembly connected with the air inlet assembly; and the discharge unit comprises an exhaust assembly arranged on the inner side of the separation assembly and a dust discharge assembly arranged at the bottom of the separation assembly. The cyclone separator has the beneficial effects that by arranging the spiral channel, the centrifugal force after dust-containing gas enters can be increased, the dust particle separation efficiency is improved, the longitudinal circulation phenomenon at the top of the separator can be effectively avoided, the influence of a top ash ring is relieved, and mutual interference of airflow in adjacent inner and outer rotational flows is avoided; and the number of particles of large-particle-size dust entering the exhaust pipe through longitudinal circulation is reduced, the flow field can be stabilized, the separation performance is improved, and the separation efficiency of small-particle-size dust is improved.

The dry gas sealing structure of the vein-shaped bionic groove comprises a movable ring and a static ring which are matched with each other, and a sealing end face is arranged on the movable ring; a plurality of dynamic pressure grooves are evenly engraved in the sealing end face of the movable ring in the circumferential direction, the inlet side of the end face of the movable ring is a high-pressure side, the other side of the end face of the movable ring is a low-pressure side, the opening position of each dynamic pressure groove is located on the high-pressure side of the end face of the movable ring, each dynamic pressure groove comprises a vein-shaped bionic groove distributed in the circumferential direction, and each vein-shaped bionic groove comprises a main vein and side veins divided into two sides from the main vein. In the operation process of the vein-shaped bionic groove, fluid flows into the dynamic pressure groove through an inlet of the dynamic pressure groove and is extruded by the dynamic pressure groove to form a high-pressure area at the main vein, so that the static ring is opened, the sealing effect is formed, the fluid is blocked at the main vein of the vein-shaped bionic groove, the dynamic pressure effect of the fluid is enhanced, and the sealing effect of the fluid is improved. Meanwhile, part of fluid flows into the low-pressure side pulse, the working medium leakage amount is reduced, the abrasion degree of a sealing piece is weakened, and the service life of the sealing device is prolonged.

The utility model relates to the technical field of cyclone separators, in particular to a slug flow self-adaptive axial flow type gas-liquid cyclone separator which comprises a reducing outer cylinder, a vertical inner cylinder, a guide impeller, a horizontal inlet pipe and a side line guide pipe. One end of the vertical inner cylinder is connected with the bottom of the variable-diameter outer cylinder, and the other end of the vertical inner cylinder is connected with the horizontal inlet pipe through a right-angle bent pipe; one end of the lateral line conduit is connected with the horizontal inlet pipe, and the other end of the lateral line conduit is connected with the variable-diameter outer cylinder; and a flow guide impeller is arranged in the vertical inner cylinder. According to the utility model, gas with pressure is transferred into the variable-diameter outer cylinder by adopting the side line guide pipe, so that the pressure in the cylinder body is increased to a certain extent, the pressure difference between the cylinder body and the horizontal inlet pipe is reduced, slug flow is prevented from being formed from an inlet, and gas and liquid can enter the separator in a small-slug flow or mixed flow state. The slug flow can be weakened or even eliminated without external intervention, so that the separation performance of the axial flow type gas-liquid separator under a complex flow pattern is improved.

The invention belongs to the field of plant factories, and particularly relates to a method for determining the optimal ventilation quantity of a plant factory. The ventilation condition of the plant factory is simulated, it is found that the Reynolds number and the Archimedes number can well represent the change condition of environmental parameters in the plant factory, and specific values of the Reynolds number and the Archimedes number which can balance better environmental parameter distribution and lower ventilation energy consumption of the plant factory are selected; as a basis for calculating and judging the optimal ventilation quantity of the plant factory, the minimum ventilation quantity is adopted to save environmental regulation and control energy consumption while ensuring that the cultivation area reaches an ideal cultivation environment to the maximum extent, and the stability of a flow field of the cultivation area is ensured.

The invention relates to the field of gas detection, and discloses an electronic nose device with double gas inlet channels and a gas detection method. A filter, a double-cavity air inlet shell with a front-narrow rear-wide structure and a sensor annular placing hole, an air flow guide structure, a sensor array and an air exhaust shell are manufactured in a 3D printing mode; the sensor array is fixedly connected with the gas flow guide structure; the outer wall of the gas guide device is in contact with the inner wall of the gas inlet shell and is fixed in a magnetic attraction manner; the air exhaust shell is connected with an air pump through a rubber tube; the gas inlet shell and the gas exhaust shell are spliced together in a stepped mode, the purpose of detaching and replacing the sensors can be achieved, and through unique sensor combination and an advanced data processing algorithm, the components and concentration of target gas can be rapidly recognized and quantitatively analyzed. According to the invention, the contact time of the gas and the sensor is prolonged while rapid suction of the gas is guaranteed, and efficient and accurate detection of various different types of gas is realized.

The application relates to the air conditioning technical field and discloses an indoor unit and an air conditioner. The indoor unit comprises a shell, an air duct formed in the shell, an air inlet and an air outlet, and the air duct is communicated between the air inlet and the air outlet; a heat exchanger located in the air duct; a cross-flow fan located in the air duct, the cross-flow fan comprising a motor; wherein a side wall of the air duct is provided with an exhaust passage communicated with the air duct, the shell is further provided with a heat dissipation passage, the heat dissipation passage is located outside the air duct and is communicated between the exhaust passage and the motor, and airflow in the air duct can flow to the motor through the exhaust passage and the heat dissipation passage. The airflow in the air duct has certain kinetic energy and temperature regulation, thereby providing continuous cooling effect for the motor, so that the heat dissipation efficiency of the motor is remarkably improved, and the service life of the motor is prolonged.

The invention provides an indoor unit of an embedded air conditioner and the embedded air conditioner. The indoor unit comprises an indoor fan, an air inlet is formed in the lower side of the indoor fan, and an air outlet is formed in the periphery of the indoor fan; the indoor heat exchanger extends in the peripheral direction of the indoor fan and is arranged opposite to the air outlet, and the indoor heat exchanger is arranged around the indoor fan; the side wall face, facing the air outlet, of the indoor heat exchanger forms a heat exchange face, and an air guide mounting plate is arranged on the heat exchange face, extends in the width direction of the indoor heat exchanger and is parallel to the central axis of the indoor fan. And at least the part, connected to the heat exchange surface, of the air guide mounting plate is perpendicular to the heat exchange surface. According to the indoor unit and the embedded air conditioner provided by the invention, the aerodynamic performance between the fan blade air outlet and the indoor heat exchanger can be effectively improved, the generation of vortexes is reduced, and the generation of fin noise at the indoor heat exchanger is reduced.

The present invention belongs to the technical field of spraying devices, and provides a plant protection spraying device. The present invention preliminarily mixes liquid medicine through a mixing pipe, and then uses a mixing component to further mix the liquid medicine. The mixed liquid medicine is thrown out from the bottom of the mixing component into an outer cover shell, so as to accelerate the flow of the liquid medicine and effectively improve the uniformity of liquid medicine mixing. The mixed liquid medicine is finally sprayed out through an improved fan-shaped nozzle. The three-level stepped structure of the inner cavity of the fan-shaped nozzle can make the internal flow field more stable. The droplet pipeline structure has hydrophobic properties, which can reduce the adsorption of liquid medicine on the inner cavity surface, reduce the waste of liquid medicine, and make the sprayed liquid medicine ratio more accurate. A plurality of fish-scale pits can affect the local flow of liquid medicine on a microscopic scale, so that it has a tendency to change from turbulent flow to laminar flow, reduce turbulent kinetic energy, reduce the kinetic energy loss of liquid medicine, increase the speed of liquid medicine spraying at the nozzle, make the liquid medicine atomized finer, and improve the efficiency and effect of plant protection operations.

The application discloses a 10kV high-voltage switch cabinet single-gas-chamber gas diffusion test device, a test method, a system, equipment, a medium and products, and relates to the field of power equipment state monitoring and fault diagnosis. The device comprises a box body which is identical to the bottom gas chamber structure of the 10kV high-voltage switch cabinet, and is internally provided with a plurality of fault simulation points of a contact area, a conductor lap joint area, a cable terminal area and a bottom wiring area, and a plurality of monitoring points located at the front side position and the rear side position of the lower right corner of the gas chamber; the box body is also provided with a comb-shaped heater to simulate the operating temperature rise convection environment. The test method based on the device comprises the following steps: injecting characteristic gas to simulate discharge faults of different positions and intensities through the fault simulation points, setting the temperature rise working condition through the comb-shaped heater, synchronously collecting time sequence data of the characteristic gas concentration at the plurality of monitoring points, and extracting gas transport characteristic parameters. The application provides a standardized and repeatable test platform for studying gas diffusion rules and optimizing sensor layout.

The invention discloses a ship engine methanol fuel supply pipeline detection device, and relates to the technical field of pipeline detection, the ship engine methanol fuel supply pipeline detection device comprises a cabinet, and the upper surface of the cabinet is fixedly provided with a panel. By arranging the case and the panel, a firm protective shell and a flat operation platform are provided for the whole detection device, the case is made of an anti-corrosion material so as to adapt to the marine environment, and the panel serves as an installation reference of each functional module; the spraying mechanism is used for rapidly injecting a detection solution into the methanol fuel supply pipeline, a first connecting frame is fixedly arranged on the outer surface of the spraying mechanism, and the first connecting frame is fixedly connected to the inner wall of the panel. By arranging the spraying mechanism and the first connecting frame, a high-pressure injection system of a detection solution is formed, the first connecting frame provides accurate mounting and positioning for the spraying mechanism, and the spraying mechanism is responsible for generating controllable pressure to quickly inject the detection solution into a to-be-detected pipeline, so that the effect of sealing and detecting a supply pipeline is achieved.

A hydrogen sulfide combustion furnace for preparing sulfuric acid through a wet method comprises a furnace body, a combustor, a smoke outlet and a tracery wall, the combustor and the smoke outlet are arranged at the two ends of the furnace body, the tracery wall is arranged in the furnace body and located at the smoke outlet end, the tracery wall is mainly composed of solid refractory bricks and hollow refractory bricks, and the solid refractory bricks are arranged on the portion, close to the inner wall of the furnace body, of the tracery wall. Hollow refractory bricks with through holes in the middle are arranged at the part far away from the inner wall, meanwhile, gaps are formed between the hollow refractory bricks in the same horizontal direction and the adjacent hollow refractory bricks, and through holes are also formed in the gaps. The door-shaped channel is arranged in the tracery wall, maintenance is convenient, the solid refractory bricks and the hollow refractory bricks are used at the same time, the tracery wall can be well supported, the gaps between the hollow refractory bricks are matched, the different ventilation rate requirements can be met, the combustion requirements of hydrogen sulfide gas with different concentrations are met, and gas combustion is more sufficient.

The invention relates to a vortex ring pollination device for blueberries. A pollen supply system; the cylindrical pollination cavity is arranged on the lower side of the pollen supply system and is communicated with the pollen supply system; the pollination cavity is sleeved with the outer-layer cavity, the top of the outer-layer cavity is connected with the pollination cavity in a sealed mode, and the bottom of the outer-layer cavity is located on the lower side of the pollination cavity and provided with a flexible sealed opening; the vortex ring generation system is mounted on the outer-layer cavity and is communicated with the inner cavity of the pollination cavity; the pollination shell is arranged outside the pollen supply system, the pollination cavity, the outer layer cavity and the vortex ring generation system in a crossing and sleeving manner, an opening is formed in the bottom of the pollination shell and is used for mounting the flexible sealing opening, and a side wall opening for the vortex ring generation system to work is formed in the side edge of the pollination shell. By means of the airflow-driven fan-screw rod linkage design, integration of three functions of pollen blockage prevention, pneumatic stirring and mixing and downward pushing is creatively achieved, the structure is compact, additional motor driving is not needed, and reliability is high.

The application relates to a purging device for a liquid preparation system and relates to the technical field of medicine liquid preparation. In order to solve the problem that a traditional purging device cannot completely purge, the purging device comprises a conveying pipeline, the inlet end of the conveying pipeline is provided with a compressed air supply source, the outlet end of the compressed air supply source is sequentially and serially provided with a pressure reducing valve and an electric heater along the conveying pipeline, a plurality of heating modules are arranged in the electric heater, the plurality of heating modules are vertically stacked along the height direction of the electric heater, a heating channel is formed in the electric heater from bottom to top, and a temperature gradient from low to high is formed when the compressed air flows through the heating channel. The application has the effects of effectively stripping the residual moisture on the surface of the system, improving the removal rate of the residual moisture and solving the microbial pollution risk caused by incomplete purging.

The invention discloses a U-shaped variable cross-section pouring cup and a gravity casting metal mold, the U-shaped variable cross-section pouring cup comprises an inlet area, a first arc-shaped descending area, an arc-shaped ascending area, a second arc-shaped descending area and a sprue which are communicated in sequence, and the pouring cup can improve the quality of a casting.

The present invention discloses a device and method for realizing rapid separation of large-scale oil-water mixtures. The separation device includes one or more cyclone core tubes, which are cyclone sections, tapered sections and flow-stabilizing tubes from bottom to top. The cyclone section is a cylinder with upper and lower openings, and the lower end opening of the cyclone section is an axial inlet, and a spiral blade is provided on the upper part of the axial inlet; the tapered section includes an inner cone section with a certain taper and upper and lower openings, and a sleeve outside the inner cone section, and a plurality of water phase outlets are evenly distributed on the sleeve in an annular direction, and two rows of water holes are axially symmetrically provided on the inner cone section; the flow-stabilizing tube is a cylinder with upper and lower openings, and the lower end of the flow-stabilizing tube penetrates into the inner cone section from the upper opening of the inner cone section and is fixed to the upper part of the cyclone section, and the upper opening of the flow-stabilizing tube is an oil phase outlet. The separation device of the present invention introduces a flow-stabilizing tube to collect large oil droplets near the axial direction of the cyclone section, and has a compact structure, high separation efficiency and stable separation effect.

The invention discloses an implementation method for uniformizing a wind field and neutralizing powder static electricity of a powder spreading type metal 3D printer. Comprising a main bin, the main bin, a draught fan, a filter and an ion propelling device form a closed cycle, and the ion propelling device is arranged at the height of a powder laying plane. The ion propulsion device includes a positive electrode, a negative electrode, and a high voltage power source. The high-voltage power supply generates an electric field through the positive electrode and the negative electrode to ionize gas, and gas ions generated after ionization are accelerated by the electric field to form ionic wind. And the ionic wind takes away ash on the powder spreading plane and neutralizes charges existing on the surface of the powder, so that powder agglomeration is prevented.

The invention provides an intelligent battery changing cabinet with an independent battery compartment, and relates to the technical field of battery changing cabinets. The intelligent battery replacing cabinet with the independent battery bins comprises a battery replacing cabinet shell, the battery bins are evenly arranged in the battery replacing cabinet shell, the peripheral sides of the battery bins communicate with independent air bins, the independent air bins comprise the upper air bin, the lower air bin, the left air bin and the right air bin, and negative pressure holes are formed in the top ends and the bottom ends of the upper air bin and the lower air bin. The aperture of the negative pressure hole is gradually increased; a division piece is arranged in the upper and lower air cabins; the plurality of independent channels are communicated with one another; a plurality of flow guide ribs are distributed in the independent channel; resistance balance cylinders are arranged in the left and right air cabins, a plurality of radial air outlet grooves are formed in one sides of the left and right air cabins, air flows are formed in the upper and lower air cabins and the left and right air cabins through the exhaust fans, and the air flows in the left and right air cabins enter the battery cabin and enter the upper and lower air cabins through suction force formed by the negative pressure holes; and airflow is formed on the periphery and inside the battery compartment to enhance the heat dissipation effect.

The invention discloses a turbomachinery air cylinder inner side meridian molded line design method based on flutter suppression, and relates to the technical field of turbomachinery blade flutter suppression. Obtaining a radial basis function model; the radial basis function model is used for predicting the minimum aerodynamic damping value of the turbomachinery blade; the design parameters of the meridian profile on the inner side of the turbomachinery air cylinder serve as optimization variables, the maximum minimum aerodynamic damping value of a blade corresponding to the design parameters predicted by the radial basis function model serves as an optimization target, iterative optimization is conducted through an intelligent optimization algorithm, and the optimal design parameters are obtained; the design parameters represent radial distances from a plurality of points arranged at equal intervals in the axial direction between the front end position of a meridian molded line inlet section on the inner side of the turbomachinery air cylinder and the front edge position of a blade to a hub; and according to the optimal design parameters, the meridian molded line of the inner side of the turbomachinery air cylinder is determined. According to the method, the design aerodynamic performance of the meridian molded line on the inner side of the turbomachinery air cylinder is improved, and the flutter suppression capacity of the blade is enhanced.

The invention discloses a steady wind speed control method for an open-type high-speed wind tunnel, and the method comprises the steps: opening a pneumatic control valve to a certain opening degree through the calculation of a pre-opening degree, then instantaneously opening a rapid valve, releasing the pressure of a gas storage tank, generating high-speed airflow, and rapidly building a flow field; collecting data during wind tunnel operation in real time, filtering the data and inputting the data into a control system; the Mach number of a test section is calculated in real time according to data collected in real time during operation of a wind tunnel, the optimal control quantity of a pneumatic control valve is calculated through predictive control, and the optimal control quantity is weighted to participate in final output of fuzzy control and PI control; an error and an error change rate between the actually measured Mach number and an expected Mach number are calculated, when the error is larger than or equal to 0.05, fuzzy control is used for adjustment, the error and the error change rate serve as input of fuzzy control, and control output is generated through fuzzy rule reasoning to preliminarily adjust a wind tunnel flow field; and when the error is less than 0.05, further adjusting according to the feedback error of the control system by using a position type PI control algorithm.

This invention relates to a method for constructing a multi-hole outflow nozzle model for wafer electroplating tanks based on computational fluid dynamics, belonging to the field of semiconductor device surface treatment technology. The method includes constructing an orifice outflow calculation model using a combination of the modified Darcy-Weisbach equation, the modified Bernoulli equation, and the Torricelli formula; obtaining the pressure difference between the cross-sections of adjacent nozzles using the Darcy-Weisbach equation, and establishing a pressure calculation formula for each nozzle; for laminar and low Reynolds number turbulent flows, combining the modified Bernoulli equation and the Torricelli formula to obtain the flow rate at the nozzle, and obtaining the relationship between the flow rate at the nozzle and the cross-sectional area of ​​the nozzle; and constructing the... i Geometric parameters of each injection hole i The solution formula is obtained; and the cross-sectional area and radius of the injection hole are obtained under the condition of neglecting the friction effect. r The calculation formula was used to construct a multi-orifice nozzle model. This ensured that the flow rate at all orifices was equal, guaranteeing stable liquid level and flow field within the tank.

The utility model discloses a main shaft of high-speed friction washing equipment, and relates to the technical field of plastic recovery equipment. A plurality of pairs of blade assemblies which are arranged in a 180-degree staggered mode are fixed to the circumference of the outer shaft at equal intervals, each pair of blade assemblies comprises two blades, the two blades are located outside the same circumferential section of the outer shaft, the two blades are arranged in a 180-degree mode, the blades and the axis of the outer shaft are arranged in a 90-degree mode, and the two blades are fixed to a first fixing plate through first bolts. A first reinforcing plate is arranged on one side of the first fixing plate, and the first fixing plate and the first reinforcing plate are welded to a shaft body of the outer shaft. And a pair of discharging blades which are arranged at an angle of 180 degrees are arranged outside the same circumferential section of the discharging end of the outer shaft, and the discharging blades and the blades in the same circumferential direction are arranged at an angle of 180 degrees. According to the utility model, materials can be uniformly dispersed, a stable flow field and multi-angle friction are formed, vibration and abrasion are reduced, and the equipment stability is improved.

The present application relates to the technical field of device heat dissipation, and provides a straight fin for a heat dissipation module and the heat dissipation module, the straight fin has a first end close to an air inlet position and a second end opposite to the first end, wherein a vertical hole is formed in the straight fin, the distance between the vertical hole and the first end is greater than the distance between the vertical hole and the second end. In the scheme, the entry section of the straight fin close to the air inlet position is not perforated, so that the airflow can smoothly enter and the flow field is stable, and the flow resistance is prevented from rising due to early disturbance. The middle and rear sections of the straight fin far away from the air inlet position have the thickest laminar boundary layer and the weakest heat exchange, and only the vertical hole is arranged in the middle and rear sections, and the outlet section of the straight fin is not perforated, so that the airflow after mixing can smoothly flow out, the wake loss and backflow interference are reduced, and the heat dissipation performance is improved.

The invention discloses a sine-type wall surface annular photocatalytic reactor and application thereof in degradation of gaseous pollutants, the sine-type wall surface annular photocatalytic reactor comprises a reactor main body, a light source is arranged on the central axis of the reactor main body, the inner side wall of the reactor main body is a sine-type wall surface, and a photocatalyst layer is arranged on the inner side wall. One end of the reactor main body is provided with an air inlet, and the other end is provided with an air outlet. The airflow directly impacts the wall surface of the air inlet, so that damage to the lamp source caused by direct impact of the airflow is avoided; the sinusoidal wall surface is used as a carrier of a photocatalyst, and the amplitude A and the angular frequency omega are adjusted, so that the photocatalytic reactor has larger reaction area and low pressure drop, the collision between pollutants and active sites of the photocatalyst is increased, and meanwhile, the fluid viscosity is adjusted, so that an internal flow field of the photocatalytic reactor is more stable. Compared with an annular photocatalytic device with a smooth wall surface, the trichloroethylene degradation efficiency of the annular photocatalytic device with the sinusoidal wall surface is improved by 5.13%.

This invention discloses an engine combustion closed-loop feedback monitoring device and system integrating multiple sensor interfaces in the field of engine combustion monitoring technology. The device includes a monitoring cylinder fixedly mounted on the cylinder head. A pre-measuring chamber and an optical measuring chamber are sequentially formed along the axial direction within the monitoring cylinder. The inlet end of the pre-measuring chamber is connected to the engine combustion chamber, and its outlet end is connected to the optical measuring chamber. A valve assembly is provided within the pre-measuring chamber, which is used to periodically open or close the communication channel between the pre-measuring chamber and the combustion chamber, and simultaneously periodically open or close the communication channel between the pre-measuring chamber and the optical measuring chamber. Multiple sensor interfaces are circumferentially formed on the side wall of the monitoring cylinder corresponding to the pre-measuring chamber. This device adopts a single-hole air-drawing installation to protect the structural strength of the cylinder head, and uses a chamber-based measurement layout to avoid mutual interference, keeping the optical monitoring component away from the high-temperature and high-pollution area of ​​the combustion chamber to prevent contamination and thermal damage.

The present application relates to a kind of diamond alloy heat-dissipating cold plate, it includes the substrate made of diamond alloy, cover plate, two connecting rings and two water taps;The substrate is opened with accommodating cavity, the accommodating cavity is provided with fin, the fin is surrounded with retaining wall, and the four around of the fin and the retaining wall are all left with gap to form flow channel;The cover plate is capped at the accommodating cavity opening of the substrate, and is sealed with the retaining wall Connection, form sealed heat exchange cavity;Two the connecting rings are set on the cover plate, and are communicated with the heat exchange cavity;Two the water taps are communicated with two the connecting rings respectively, for the in and out of cooling liquid.The present application has the effect of high heat conduction efficiency, strong structure adaptability, reliable sealing and stable heat dissipation performance.

This application provides a low-resistivity polycrystalline silicon carbide bulk material and its preparation method and apparatus. The method involves using isostatically pressed graphite as a substrate, first loading it into a reaction mechanism and creating a sealed negative pressure environment through vacuum. Then, the furnace body is heated in sections to a set deposition temperature. Subsequently, argon, hydrogen, methyltrichlorosilane, and nitrogen are sequentially introduced to achieve the set pressure within the furnace, and deposition is carried out at this temperature to obtain a silicon carbide deposit. Finally, the gas supply is stopped, the gas inside the furnace is replaced with nitrogen, and the product is removed after controlled cooling to room temperature. Through vacuum sealing, sectioned temperature control, precise gas supply, and stable pressure deposition, the uniform distribution of reaction gases and the full progress of the reaction are effectively ensured, significantly improving the density, thickness uniformity, and compositional stability of the silicon carbide deposit. Simultaneously, stable nitrogen doping is achieved, resulting in a low-resistivity, high-purity, crack-free, and defect-free polycrystalline silicon carbide bulk material. The process offers strong controllability and good product consistency, meeting the stringent application requirements of high-end industrial fields.