12results about How to "Improve hydraulic performance" patented technology

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 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 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.

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.