23results about How to "Improve hydraulic performance" patented technology

The invention belongs to the field of medical radioactive isotope preparation, and particularly relates to a method for extracting lead-212 and bismuth-212 from a thorium-232 decay chain, a solution containing a thorium-232 decay chain substance passes through an anion exchange resin column, the solution containing the thorium-232 decay chain substance contains halide ions, and the anion exchange resin column is used for extracting the lead-212 and the bismuth-212 from the thorium-232 decay chain substance. The concentration of hydrogen ions in the solution containing the thorium-232 decay chain substance is greater than 0.01 mol / L, the lead-212 and the bismuth-212 are adsorbed by the anion exchange resin column, other nuclides directly penetrate through the anion exchange resin column and are not adsorbed, a leaching reagent is introduced to desorb the lead-212 and the bismuth-212 from the anion exchange resin column, and the lead-212 and the bismuth-212 are separated and extracted; the method can be used for simultaneously extracting lead-212 and bismuth-212, has the advantages of high extraction speed and high purity, and is not easy to cause organic pollution to products.

The plunger pump system with the cooling device comprises a plunger pump body and the cooling device, the plunger pump body comprises a plunger pump cylinder body, a plunger, a lining, a sealing assembly and a cooling flow channel, and the cooling flow channel is arranged in the plunger pump cylinder body; the cooling device comprises a liquid storage tank, a circulating pump and a heat exchanger; the circulating pump comprises a volute, an impeller and a rotating shaft; the impeller comprises a rear cover plate, a front cover plate, blades and a balance hole; the impeller is characterized in that a balance jet device is installed in the balance hole and used for enabling high-pressure liquid on the back pressure side of the impeller to flow back into the impeller cavity through the balance jet device, and the jet angle of the balance jet device can be adjusted. According to the circulating pump, the axial force can be balanced, and meanwhile, secondary flow and flow loss at the blade inlets can be reduced, so that the hydraulic performance and efficiency of the circulating pump can be improved, the plunger pump cylinder body can be efficiently cooled, the operation stability of the plunger pump is improved, and the service life of the plunger pump is prolonged.

The improved high-performance fire pump comprises a centrifugal impeller, a volute, a rotating shaft and a motor, the centrifugal impeller comprises a rear disc, a front disc and blades, and the inner side of the rear disc is provided with a first plane; the impeller is characterized in that the blade comprises a main blade part and a small blade part which are integrally formed, the main blade part is provided with a main blade front edge, the rear edge of the small blade part is repeated with the main blade front edge, and an included angle a is formed between the top edge of the small blade part and the first plane; the included angles a between at least more than 50% of the top edges in the plurality of small blade parts and the first plane are not equal, and the included angles a are equal to 1-15 degrees. Through the design of the small blade part, turbulent flow or backflow and secondary flow at the blade inlet in the impeller cavity can be reduced, the anti-cavitation performance of the fire pump can be improved, and therefore the hydraulic performance and efficiency of the fire pump can be improved.

The invention discloses a vertical multistage centrifugal pump with a fully open flow channel, comprising a motor, an inlet and outlet water housing and a cylinder connected in sequence, a flow channel housing being arranged in the cylinder, the flow channel housing comprising an extrusion section, a middle section and a suction section connected in sequence, a guide impeller being arranged in the flow channel housing, the motor being connected to the cylinder through the inlet and outlet water housing, the inlet and outlet water housing being connected to the extrusion section, the middle section, the suction section and the guide impeller through a pipe; the guide impeller is composed of several stages of impellers connected in sequence from top to bottom, the bottom impeller being located in the suction section, each stage of the impeller comprising a hub and blades covering the hub, the outer edge positions of the inlet and outlet of the blades being connected with a water inlet ring and a water outlet ring; a flange connection surface is arranged at the maximum outer diameter position of the guide impeller, and the connection surface between the extrusion section, the middle section and the suction section is a flange connection stop fitting surface. The invention solves the defects in the traditional vertical multistage centrifugal pump, improves the manufacturing accuracy and hydraulic performance of the centrifugal pump, and is convenient for installation and maintenance.

The utility model discloses a connection structure of a pump shaft and an impeller and a centrifugal pump, a hub of the impeller is configured in a way that the end part matched with an inlet runner of the impeller is closed, the other end part is open, and a shaft groove used for being connected and matched with the pump shaft is formed, so that when the pump shaft is arranged in the shaft groove, the pump shaft cannot penetrate through the hub; meanwhile, the connecting end of the pump shaft is arranged in the shaft groove and is connected with the shaft groove through a fixed connecting piece, so that a connecting structure of the pump shaft and the impeller is integrally arranged in the shaft groove, an impeller nut cannot be formed in an inlet runner of the impeller, and the inlet runner structure of the impeller cannot be damaged; the end portion, matched with the inlet of the impeller, of the hub is closed, the hub and the rear cover plate can be connected and matched to form a flow channel partition plate in an inlet flow channel of the impeller according to the hydraulic performance requirement of the impeller, meanwhile, liquid in the impeller cannot leak into a shaft groove, and therefore the hydraulic performance of the impeller is improved.

The invention discloses an S airfoil profile and bidirectional axial flow pump multi-objective optimization method based on NSGA-II, and belongs to the field of S airfoil profile optimization. The method comprises the following steps: parameterizing an S airfoil profile to obtain a parameterized S airfoil profile geometric model; performing numerical calculation based on the parameterized S airfoil profile geometric model to obtain airfoil profile performance data; constructing an S airfoil profile multi-objective optimization model based on the performance data of the airfoil profile, and solving the S airfoil profile multi-objective optimization model based on an NSGA-II algorithm to obtain an optimal airfoil profile design scheme; constructing a new impeller model based on the optimal airfoil design scheme; and performing numerical simulation on the new impeller model to obtain a water conservancy performance evaluation result.

The thermal management system comprises the power battery, a radiator, a water pump, a water tank and a heater, the water pump comprises a volute, a water outlet pipe, a water inlet pipe and a centrifugal impeller, a second volute plate is arranged in the volute, a diffuser is arranged on the periphery of the centrifugal impeller, and the diffuser comprises diffuser blades; the centrifugal compressor is characterized in that the diffuser comprises a first semicircular part (72) and a second semicircular part (73), the top end roughly passing through the volute tongue, the rotating axis of the centrifugal impeller and the top end of the front edge of the second volute plate are connected to form a dividing line, the dividing line divides the diffuser into the first semicircular part and the second semicircular part, the contour line of the outer periphery of the first semicircular part comprises an arc R1 and an arc R2, and the arc R1 is a circular arc R2. The radius R2 is larger than R1, and the first semicircular part and the second semicircular part are arranged in a central symmetry mode. Turbulence and pressure loss can be reduced, the hydraulic performance of the water pump is improved, the service life of the water pump is prolonged, supply stability of a thermal management system of the power battery can be guaranteed, and the failure rate is reduced.

The pressure vessel comprises a shell, a hanging basket and a vortex suppression piece, in the using process, the hanging basket is used for arranging a reactor core, a coolant enters through an input port in the shell, then flows into an annular descending channel formed between the outer side wall of the hanging basket and the shell, continuously flows downwards along the descending channel, and is cooled to the outside, and the vortex suppression piece is arranged in the shell. And the lower cavity area at the bottom of the shell is reached. After entering the lower cavity at the bottom of the shell, the coolant is changed in flowing direction by the arc-shaped wall surface at the bottom of the shell to flow upwards, is in contact with the vortex suppression piece arranged in the shell and then continuously flows upwards in the area, and the upwards flowing coolant enters and flows through the reactor core lower plate, then enters the reactor core area used in the hanging basket and flows through the reactor core area to form a reactor core. And finally, the coolant flows out of the pressure vessel through the output port in the shell, and the vortex suppression plate can enable the coolant entering the reactor core to be distributed more uniformly, so that the reactor core is effectively cooled.

The fire pump comprises a volute, an impeller and a rotating shaft, the volute comprises a front side wall, an inlet pipe and a pumping chamber, and the impeller comprises a front cover plate, a rear cover plate, blades and an inlet ring; the device is characterized in that an adjusting ring is arranged on the peripheral face of the inlet ring, the adjusting ring is rotatably arranged relative to the inlet ring, the adjusting ring comprises a ring body, first guide vanes and first communicating holes, the first guide vanes are arranged on the peripheral face of the ring body, the multiple first guide vanes are evenly distributed in the circumferential direction, and the left end face of the inlet ring is connected with an end cover ring through a connecting piece; a second communicating hole is formed in the inlet ring and formed in the right side of the adjusting ring. The adjusting effect on unsteady flow and pressure pulsation at the inlet of the fire pump can be improved, the cavitation performance and inlet secondary flow can be reduced, and therefore the small-flow hump phenomenon can be improved or eliminated, and the hydraulic performance and operation stability of the fire pump are improved.

The invention discloses a cooling device for a power battery, the cooling device comprises the power battery, a water tank, a water pump, a radiator and a cooler, the water pump comprises a volute and a centrifugal impeller, and the centrifugal impeller comprises a front disc (61), a rear disc (62), a first blade (63) and a second blade (64); the rear disc comprises a first connecting disc (65) located on the inner side and a second connecting disc (66) located on the outer side, the first connecting disc (65) and the second connecting disc (66) are connected with each other, a first adjusting hole (67) and a second adjusting hole (68) are formed in the first connecting disc (65), a communicating hole (69) is formed in the first connecting disc (65) or the second connecting disc (66), and the first adjusting hole, the communicating hole and the second adjusting hole are sequentially connected; the first adjusting hole is located in the radial peripheral side of the second blade, and the second adjusting hole is close to the concave arc face of the first blade. The thickness / height and laminar flow / turbulent flow characteristics of the boundary layer of the concave arc surface of the first blade can be adjusted / controlled, so that the anti-cavitation performance of the centrifugal pump can be improved, noise can be reduced, the hydraulic performance and efficiency of the water pump can be improved, the service life of the water pump can be prolonged, stable supply of a thermal management system of a power battery can be guaranteed, and the failure rate can be reduced.

The invention discloses a high-efficiency multistage pump, which comprises a segmented pump casing (1), a centrifugal impeller (2), a partition (3), a positive guide vane (4), and a reverse guide vane (5), wherein the segmented pump casing has a radial section (11); the centrifugal impeller comprises a front disc (21), a rear disc (22), a blade (23), and an inlet ring (24), wherein the blade has a blade leading edge (26), and the reverse guide vane has a reverse guide vane trailing edge (51); the pump is characterized in that a sealing groove (52) is provided on the reverse guide vane, the upstream end of the inlet ring is embedded in the sealing groove, the left side surface of the radial section (11) is used as a reference surface, the upstream end surface of the inlet ring is located on the left side of the reference surface, and the reverse guide vane trailing edge is substantially located on the right side of the reference surface. The invention can effectively improve the sealing effect between the reverse guide vane and the next-stage impeller, reduce the backflow and turbulence at the impeller inlet, and reduce the flow loss at the next-stage impeller inlet, thereby improving the hydraulic performance and efficiency of the multistage pump.

The invention discloses a self-flushing irrigation emitter and method, the irrigation emitter comprises an irrigation emitter body and a rotation control device, an energy dissipation flow channel is arranged in the irrigation emitter body, and the rotation control device is connected with the irrigation emitter body. When pressure water flow enters the flow channel unit through the water inlet groove, the water flow in the flow channel unit is divided into two strands by the water retaining piece and then enters the next flow channel unit, vortexes are generated in the flow channel unit, water flow energy is consumed, the hydraulic performance is improved, and the water flow velocity is reduced. External wind enables the outer fan to rotate, so that the inner fan is driven to rotate, and airflow is generated in the water retaining piece. As the water blocking piece is made of a breathable and waterproof material, airflow can penetrate through the water blocking piece to enable the flow channel to block the particles to generate turbulent fluctuation, the flow channel is flushed to enable the particles to flow out along with water flow, and the probability that the particles are retained in the flow channel is reduced.

The electronic water pump comprises a machine shell, a volute, a rear cover and an independent motor stator plastic coating assembly, a containing cavity is formed in the machine shell, the upper end of the machine shell is connected with the volute, the lower end of the machine shell is connected with the rear cover in a sealed mode, the volute is communicated with the containing cavity, and the motor stator plastic coating assembly is arranged in the containing cavity. The motor stator plastic-coated assembly is a module which is assembled in advance and is detachably assembled in the accommodating cavity, the motor stator plastic-coated assembly comprises a stator plastic-coated body, a rotor assembly and a placing plate, the stator plastic-coated body comprises a stator assembly and a plastic-coated layer, the plastic-coated layer is coated outside the stator assembly, and the rotor assembly is detachably assembled in the placing plate. An annular sealing groove used for containing a sealing ring is formed between the outer side face of the stator plastic-coated body and the inner side face of the machine shell, the rotor assembly is arranged in the stator plastic-coated body, and the placing plate is connected with the lower end of the stator plastic-coated body through the fixing assembly. By reducing the gap between the motor stator and the rotor, the product performance is effectively improved, product parts are reduced, and the shell structure is simplified.

The invention discloses a construction process of a concealed large-span steel corrugated plate arch bridge. The construction process comprises the following steps: (1) constructing a foundation and arch feet; (2) arch ring construction; (3) concrete pouring construction; (4) paving earthwork at the upper part of the arch ring; and (5) constructing a bridge deck pavement layer to finish the construction of the whole concealed large-span steel corrugated plate arch bridge. Construction is convenient, maintenance is easy, the arch bridge has good rigidity and toughness, the deformation resistance is high, and the special requirements of unfavorable geological conditions for the structure can be met; the tensile / compression resistance, the shear resistance and the fatigue resistance of the arch bridge are improved, the shock resistance of the structure is greatly improved, and the structure can be widely applied to the arch bridge with the span of 30-45 m.

This application relates to a hydraulic design method for submersible pumps, and pertains to the technical field of pumps. The meridional streamline function of the impeller satisfies the following relationship: Let the meridional streamline function be F(x), then... When 0 <x<x 1 hour, When x 1 <x<x 2 hour, When x 2 <x<x 3 hour, In the formula: x is the horizontal distance from the impeller inlet; x 1 It is the horizontal distance between the intersection of the inlet arc segment and the straight segment and the impeller inlet; x 2 It is the horizontal distance between the intersection of the arc segment and the straight segment at the outlet and the impeller inlet; x 3 It is the horizontal length of the entire impeller meridional plane; k is a coefficient, and c is a constant. This application has the advantages of reducing wear caused by the impact of silt on the guide shell, and improving the pump's operational reliability and service life.

The application provides a design method for a streamlined space guide vane of a multistage centrifugal pump, and belongs to the technical field of hydraulic machinery. The design method for the streamlined space guide vane of the multistage centrifugal pump directly controls the guide vane profile according to a curve equation, can adapt to various change conditions, significantly improves the guide vane design efficiency under the condition of controlling the direction of the inlet and outlet flow passages, and has extremely important role and value for improving the hydraulic performance of the space guide vane. The positive and negative guide vanes of the design method for the streamlined space guide vane of the multistage centrifugal pump are an integral streamline, have obvious optimization effect, are simple in design calculation, and are high in adaptability.

The application discloses a hydraulic design method for a clock-shaped water inlet flow channel of a bidirectional flow channel pump device. The method is realized through the following steps: firstly, determining a suitable axial flow pump type and model; then, performing geometric modeling, constructing a water inlet flow channel model comprising a horn pipe, a guide vane, a partition pier and a gate, and dividing the horn pipe profile line into three sectional lines and determining the length, width, height and diameter of each part; establishing a rectangular coordinate system for profile line design, determining the curvature profile line of the horn pipe first curve section and the guide vane through the equation of the distance between the horn pipe first curve section and the meridian of the guide vane and the distance between the horn pipe first curve section and the guide vane, and respectively making the curvature profile line of the horn pipe second curve section and the straight line section. The application realizes the parametric design of the horn pipe and the guide vane sectional curvature profile line, provides specific execution steps and parametric design formula, shortens the research and development cycle, and improves the hydraulic performance and stability.

The invention provides a foldable guide pipe pump and an impeller thereof, the impeller comprises a hub and a plurality of blades, the hub is rotatably and radially supported at the near end part and the far end part of the hub respectively, and the impeller has a compressed state and a natural unfolding state; and when the impeller is in a natural unfolding state, the diameter of the far-end endpoint of each blade is smaller than that of the near-end endpoint of each blade. The impeller can reduce or avoid blood cavitation, reduce blood damage and improve blood compatibility on the premise of maintaining high hydraulic performance.

The utility model discloses an ultrahigh-water-head small-flow pump turbine runner blade. The blade comprises a blade wrap angle, a blade inlet setting angle, a blade outlet setting angle, a high-low pressure side diameter ratio and a guide blade relative height. The runner blade is scientific and reasonable in structural design, meets the design requirement of a runner, has better hydraulic performance, can greatly reduce the water storage capacity scale, is short in construction period, can accelerate the development of pumped storage, and is suitable for large-scale popularization and application, and the ultra-high-water-head small-flow pump turbine is constructed by utilizing the runner blade of the ultra-high-water-head small-flow pump turbine. The problem of in-situ consumption of renewable energy sources is effectively solved, and good social and economic benefits are achieved.

The present invention discloses a plunger pump system with a cooling device, which includes a plunger pump body and a cooling device. The plunger pump body includes a plunger pump cylinder, a plunger, a bushing, a sealing assembly, and a cooling channel. The plunger pump cylinder is provided with a cooling channel; the cooling device includes a liquid storage tank, a circulating pump, and a heat exchanger; the circulating pump includes a volute, an impeller, and a rotating shaft, and the impeller includes a rear cover plate, a front cover plate, blades, and a balancing hole; the characteristic is that a balancing jet device is installed in the balancing hole, and the balancing jet device is used to make the high-pressure liquid on the back pressure side of the impeller flow back into the impeller cavity through the balancing jet device, and the jet angle of the balancing jet device is adjustable. In addition to being able to balance the axial force, the circulating pump of the present invention can also reduce the secondary flow and flow loss at the blade inlet, thereby improving the hydraulic performance and efficiency of the circulating pump, thereby being able to efficiently cool the plunger pump cylinder, and improving the operating stability and service life of the plunger pump.

The utility model discloses a kind of double-outlet bifurcated labyrinth flow passage irrigator, including the water inlet pipe being connected with drip irrigation pipe, the water inlet pipe is connected with the water inlet of irrigator body, the water inlet output end both sides are respectively connected with a bifurcated labyrinth flow passage input end, the bifurcated labyrinth flow passage output end is connected with water outlet pipe through water outlet;The flow passage of the utility model's irrigator is bifurcated labyrinth flow passage, hydraulic performance is excellent, with pressure compensation performance, flow passage is divided into main flow passage and bifurcated flow passage, anti-blocking performance is better, and irrigator is provided with left and right two water outlets, can simultaneously irrigate two rows of crops;Secondly, irrigator structure is simple, convenient to prepare, low in cost, it is convenient for large-scale production, more suitable for large area, long distance drip irrigation operation.

The present invention discloses a flow control method for suppressing separation vortices on the inner wall of a liquid ring pump, comprising a housing, an impeller, an exhaust port, and an air intake port. The pressure of the working liquid near the inner wall of the housing in the liquid ring pump gradually increases from the air intake side to the air exhaust side, causing the flow near the inner wall of the pump housing to be a reverse pressure flow, thereby inducing flow separation and causing the pump performance to decrease. The present invention respectively sets a liquid inlet hole and a liquid outlet hole in the high-pressure area and the low-pressure area of ​​the pump, and connects them with a drainage pipe, and the angle between the axis of the liquid outlet hole and the tangent of the inner wall of the housing is less than 13°; the present invention utilizes the internal flow characteristics of the liquid ring pump, and introduces the high-pressure liquid in the high-pressure area into the low-pressure area through the drainage pipe to form a high-speed jet, and suppresses the wall separation flow, so as to improve the hydraulic performance and operation stability of the pump; the present invention realizes effective control of the separation vortex on the wall of the liquid ring pump without injecting additional energy from the outside, without complex devices, and the working liquid maintains an internal circulation state, and there is no additional liquid loss.

The utility model provides a modularization flow channel device with energy dissipation and anti-blocking performance, which comprises a flow channel, an energy dissipation cavity is arranged in the flow channel, a plurality of groups of flow channel units are arranged in the energy dissipation cavity, each flow channel unit comprises a base, an annular energy dissipation flow channel is arranged on the upper side of the base, sharp tooth protrusions are arranged on the inner wall of the energy dissipation flow channel, and the sharp tooth protrusions are arranged on the inner wall of the annular energy dissipation flow channel. The annular energy dissipation flow channels are arranged around the water distribution body, water inlets and water outlets are formed in the peripheries of the annular energy dissipation flow channels, the annular energy dissipation flow channels of the adjacent flow channel units are communicated through the water inlets and the water outlets, a water inlet is formed in one end of each flow channel and communicated with the water inlet and the water outlet of the flow channel unit arranged at the end, and a plurality of water outlets are formed in the side wall of each flow channel. And the water inlets and outlets formed in the side edges of the runner units on the boundary of the energy dissipation cavity are communicated with the corresponding water outlets. The device can adjust the water flow direction and improve the energy dissipation effect, and silt is not prone to being deposited.