232results about How to "Improve hydraulic efficiency" patented technology

A dishwasher includes a number of spray arms, a circulation pump with a pump housing, an impeller, a suction port, and a number of discharge ports on the pump housing. The discharge ports are associated with the spray arms. A water diverter is located on a delivery side of the pump and generates a flow leading from the suction port selectably to one or more of the discharge ports. The water diverter includes a blocking element having a number of diaphragm openings positionable to one or more outlet positions by a drive via a rotation of the blocking element in a circumferential direction.

There is provided a non-contact, passively suspended blood pump that includes (a) a housing; (b) a pump rotor within the housing, wherein the pump rotor has a first end and a second end, and an axis of rotation; (c) a first axial thrust bearing across a first axial gap, between the first end and the housing, that axially suspends the first end; (d) a second axial thrust bearing across a second axial gap, between the second end and the housing, that axially suspends the second end; (e) a first radial hydrodynamic bearing that radially suspends the first end; and (f) a second radial hydrodynamic bearing that radially suspends the second end. Determining pump differential pressure by monitoring rotor axial position allows automatic physiologic control.

The reversible hydraulic pressure converter (1) employing tubular valves includes a medium-pressure stage (44) consisting of a medium-pressure cylinder (2) and a double-acting medium-pressure piston (3) the position of which is sent to a control computer of the converter (19) by a piston position sensor (14), the cylinder (2) and the piston (3) forming two medium-pressure chambers (5) that can be placed in communication with a medium-pressure inlet-outlet circuit (15) by at least one tubular valve (12), the converter (1) also including two high-pressure cylinders (9) each cooperating with a high-pressure piston (8) of smaller diameter and defining two high-pressure chambers (11) that can be placed in communication with a high-pressure inlet-outlet circuit (16) by at least one tubular valve (12), each of the various tubular valves (12) cooperating with an independent valve actuator (13).

A subsea rotary gas separator system has a separator located adjacent the discharge of the pump for separating gas from the high pressure liquid stream exiting the pump. Some of the high pressure liquid is recycled back to the inlet of the pump to maintain a liquid-rich inlet stream for the pump.

Blood pumps for ventricular assist devices employ a hollow rotor to impel blood through the blood pump. A blood pump includes a housing having a housing inlet, a housing outlet, and a housing blood flow channel through which the housing inlet and the housing outlet are in fluid communication. A motor stator is disposed around the housing blood flow channel and operable to generate a rotating magnetic field. A hollow rotor is disposed within the housing blood flow channel and rotated via the rotating magnetic field. The hollow rotor has a rotor circumferential wall enclosing a rotor blood flow channel. The hollow rotor has at least one rotor blade extending inwardly from the rotor circumferential wall. The at least one rotor blade is configured to impel blood through the rotor blood flow channel when the hollow rotor is rotated via the rotating magnetic field.

A pump impeller for a centrifugal pump The impeller is defined by a shroud rotatable about an axis of rotation At least two pump vanes extend axially from the shroud, each of the vanes configured as a blunted tear drop shape and having an inside wall and an outside wall, the leading edges of which are interconnected by a blunt wall The trailing edges of the inside and outside walls merge together A substantially constant width flow channel is defined between the blunted wall of one vane and a confronting surface defined by an inside wall of the other vane The vanes are tapered in the axial directions by inclining the inside wall of each vane radially outwardly.

The invention discloses a self-cooling guide vane downdraft type submersible pump, and belongs to submersible pumps. The self-cooling guide vane downdraft type submersible pump comprises a pump body casing (1) and an electromotor (2) which is arranged inside the pump body casing (1), wherein a water outlet joint (7) is further arranged on the pump body casing (1). The submersible pump further consists of a guide shell (3) which is hermetically fixed on the lower part of the pump body casing (1), and a water suction port (31) is arranged under the guide shell (3); the output shaft (21) of the electromotor (2) extends into the guide shell (3) and is installed in the interior of the guide shell (3) through a thrust bearing chamber (4), and an impeller (5) is further installed on the output shaft (21). Guide vanes in the guide shell can make water sucked in by the impeller pass through the guide shell more smoothly, and are beneficial to increase of the hydraulic efficiency of the submersible pump, with the lift from 12m to 60m. The self-cooling guide vane downdraft type submersible pump has simple structure, smaller volume and low production cost, and is suitable for the industrialized production.

The invention discloses a hydraulic design method for a double-blade non-block centrifugal impeller. The double-blade non-block centrifugal impeller structurally comprises a front cover plate, blades and a rear cover plate. The hydraulic design method comprises the steps that (1) the main hydraulic geometrical parameters of the double-blade non-block centrifugal impeller are worked out based on a velocity coefficient method; (2) the shapes of the axial surfaces of the blades are controlled based on a quadratic Bezier curve control algorithm; (3) the molded line installation angles of the blades are controlled based on a quartic Bezier curve control algorithm; (4) optimization design is conducted on the double-blade non-block centrifugal impeller based on a non-dominated sorting genetic algorithm (NSGA) II; and (5) the double-blade non-block centrifugal impeller according with the given flow, the given lift, the given pump efficiency and the given rotating speed value is manufactured by using the data obtained in the step (1) to step (4) as the dimension parameters of the double-blade non-block centrifugal impeller. By the adoption of the double-blade non-block centrifugal impeller designed through the method, the flow capacity and the anti-twining capacity of the impeller can be improved, the internal flowing condition of the impeller is improved, and the operating stability and the hydraulic efficiency of the impeller are improved.

The invention discloses an aviation centrifugal pump blade profile optimization design method. Under a Matlab platform, a five-point four-time bezier curve and a linear function are adopted to controlthe blade profile circumference angle distribution and the product superposition change rule, and internal flow field numerical simulation is carried out on 15 sets of design results through a software UG and Fluent combined batch processing method. On the basis of obtaining a calculation space boundary condition through curved surface interpolation, numerical solution is carried out on the dual-harmonic partial differential equation by adopting a central difference format, and a hypercurved surface performance agent model is sestaboished. Global optimization is carried out on the design variable based on an artificial fish swarm algorithm by taking the highest efficiency as an objective function. The result shows that the hypersurface agent model based on the double harmonic equation canensure that the test value and the predicted value are completely consistent, the wake effect in the optimized centrifugal impeller flow is obviously weakened, and the hydraulic efficiency is improved by 5.4% compared with that of a prototype pump.

The invention belongs to the technical field of a self-priming pump, and particularly relates to an outer ring type efficient start system for the self-priming pump and a start method thereof. The outer ring type efficient start system comprises a main pump which is communicated with a water pool, a pump inlet adjusting valve, a pump outlet adjusting valve, a gas-liquid separation device, a first pressure detecting device, a second pressure detecting device and a third pressure detecting device. All the parts of the invention form a vacuum adjusting system together. The vacuum adjusting system is used to facilitate circular flow of liquid in a circular pipeline outside the pump and enable a water inlet pipeline of the main pump to be in a vacuum state so that gas and liquid can be absorbed into the main pump, the gas absorbed into the main pump is exhausted in the gas-liquid separation device, and eventually the main pump achieves self-priming to complete start process. The outer ring type efficient start system for the self-priming pump and the start method thereof are simple in structure, quick in start, simple in main pump flow channel and convenient to process, flowability of the flow channel is greatly improved, the main pump needs no other auxiliary systems so that loss inside the pump is avoided, and accordingly operation efficiency of the main pump is greatly improved.

A Francis turbine with a improved shape of blades to reduce the secondary flow around the blades and improve the hydraulic efficiency is provided. A Francis turbine comprises a rotating shaft, a crown, a plurality of blades and a band. The band is coaxially coupled with the crown by the blades and the rotating shaft, the crown, the blades, and the band as a whole are driven by water and rotate toward a turbine direction during a turbine operation. On a leading edge of at least one of the blades, a local maximum point exists between the crown and the band. The leading edge leans toward the turbine direction from the band connecting point, where the band and the leading edge are connected. And, a circumferential distance in the rotating direction between the band connecting point and the leading edge is the largest at the local maximum point.

The invention relates to a vane structure for weakening axial flow pump vane top leakage flow and leakage vortex. The vane structure is characterized in that an axial flow pump vane top is machined to be of a mazy structure which is in a sawtooth shape and has a certain gap, height, width, tooth numbers, tooth top angles and the like. The vane structure has the advantages that proper sawtooth size is selected, through the vane tip mazy structure of an axial flow pump, energy loss is increased when fluid passes through the vane top gap, leakage amount is lowered, accordingly, vane top leakage flow and leakage vortex are weakened, and the hydraulic efficiency and the operation stability of the axial flow pump are improved.

A sliding vane, positive displacement pump is provided which includes a dual mechanical seal that protects against leakage from a pump chamber while also reducing slip across rotor end faces. The dual mechanical seal may be formed as a cartridge seal that is readily demountable from the pump for replacement and service, and is retrofittable to existing pumps to improve the performance thereof. The pump may integrally include a dual mechanical seal, or the mechanical seal assembly may be provided for use by itself or in combination with a replaceable head ring that can be installed on existing pumps for repair thereof or for a retrofit upgrade of such existing pump.

A pump impeller for a centrifugal pump. The impeller is defined by a shroud rotatable about an axis of rotation. At least two pump vanes extend axially from the shroud, each of the vanes configured as a blunted tear drop shape and having an inside wall and an outside wall, the leading edges of which are interconnected by a blunt wall. The trailing edges of the inside and outside walls merge together. A substantially constant width flow channel is defined between the blunted wall of one vane and a confronting surface defined by an inside wall of the other vane. The vanes are tapered in the axial directions by inclining the inside wall of each vane radially outwardly.

The present invention relates to a double-suction microminiature paddle pump. It is characterized by that its pump paddle wheel and motor rotor are formed into one body, the centre of said motor rotor is equipped with two paddle wheel inlets which are respectively communicated with pump paddle wheel, the cross-sectional area of said two inlets is progressively expanded along flowing direction; said two paddle wheel inlets ar respectively communicated with two suction inlets of pump. Said pump has no need of mechanical drive shaft, and can implement high-effective and safety conveyance.

A subsea rotary gas separator system has a separator located adjacent the discharge of the pump for separating gas from the high pressure liquid stream exiting the pump. Some of the high pressure liquid is recycled back to the inlet of the pump to maintain a liquid-rich inlet stream for the pump.

The invention discloses an intelligent optimization method for vane profiles of fixed guide vanes of a water turbine. The method comprises the steps of building a parametric geometric model of the fixed guide vanes according to vane profile parameters of the fixed guide vanes of the original water turbine; building a three-dimensional CFD flow field simulation model of the fixed guide vanes on thebasis of the parametric geometric model of the fixed guide vanes, and then performing CFD simulation calculation on the fixed guide vanes of different vane profiles, thereby obtaining the influence of the vane profile parameters on flow field characteristics; establishing a training sample set by utilizing the influence of the vane profile parameters on the flow field characteristics, and fittinga neural network by adopting a method of an extreme learning machine, thereby obtaining corresponding relationships between the vane profile parameters and performance indexes; and according to the corresponding relationships between the vane profile parameters and the performance indexes, establishing an objective function, and optimizing the vane profile parameters in the neural network in combination with a genetic algorithm by utilizing the objective function, thereby obtaining optimal vane profile parameters. According to the intelligent optimization method, the performance of the fixedguide vanes of the water turbine can be effectively improved according to actual engineering requirements, the design time is shortened, and the design cost is reduced.

The invention discloses an impeller which comprises an upper cover plate, blades and a lower cover plate; the blades and the upper cover plate are formed by integral injection molding; the blades are formed on the lower surface of the upper cover plate and are composed of long blades and short blades; the arc length of each long blade is larger than that of each short blade; the long blades are uniformly distributed along the circumference of the upper cover plate; the long blades and the short blades are arranged alternatively in the circumferential direction of the upper cover plate; each long blade is composed of a first head part and a first tail part; each short blade is composed of a second head part and a second tail part; the first tail parts and the second tail parts are aligned at the outer edge of the upper cover plate; and the outer edge of the upper cover plate is a first circumference with the diameter being phi 1, and the second head part of each short blade is arranged on a second circumference with the diameter being phi 2, wherein the diameter phi 2 of the second circumference is 0.6-0.7 times of the diameter phi 1 of the first circumference, thus the impeller with such arrangement is beneficial to improving the hydraulic efficiency and increasing the lift.

The present invention discloses a BJL multichannel modified line special-purpose air-conditioning energy-saving centrifugal pump. Said centrifugal pump includes the following several portions: motor, blade wheel, water-discharging chamber, water-entering chamber, straight taper tube flow channel, conical water-dividing cone, curved flow-guiding rib and flow deflector, etc. said invention can raise cavitation resistance of vertical centrifugal pump, and can raise hydraulic efficiency of pump and its volume efficiency.

A system for controlling fluid flow rates in a transmission includes a pump having variable displacement and providing a pressurized fluid source, a regulating valve communicating with the fluid source and a pressure sensor, the pressure sensor producing a variable control signal whose magnitude represents a degree to which fluid flow requirements of the transmission are being provided by the fluid source, and an actuating valve producing a pressure that changes the pump displacement in response to the magnitude of the control pressure.

A machine, such as a backhoe, has a series of components connected in series and moved by separate hydraulic actuators. A position estimator determines the present position of each component from the load acting on the associated hydraulic actuator and a velocity command for the component. For each component, a function parameter estimator uses the present positions of the components to derive a set of parameters that include a static structure load that the components exert on the associated hydraulic actuator, acceleration and deceleration limits for both directions of component motion, and a control bandwidth for the associated hydraulic actuator. The set of parameters for a given component is used to control the associated hydraulic actuator.

The invention relates to a partial emission pump with a low specific speed, which comprises an inlet component and a shell component. The shell component comprises a shell, an impeller, an inducer, a transmission shaft, a diversion sleeve and a diffusion pipe; the impeller, the inducer, the transmission shaft and the diversion sleeve are arranged in the shell; the diffusion pipe is arranged on the shell and is communicated with the shell; the inlet component comprises an inlet shell and an inlet pipe; the inlet pipe is connected with the inlet shell; the partial emission pump also comprises a throat part arranged on the shell; the shell is communicated with the diffusion pipe through the throat part; and the central line of the diffusion pipe is parallel to the external tangent line of an annular channel on the shell. The invention solves the technical problems of narrow blade outlet, difficult manufacture and processing of the impeller and low efficiency of the centrifugal pump, facilitates the large-scale adjustment of operating conditions, and improves the hydraulic efficiency of the pump.

The invention discloses a heating pump and a dishwasher. The heating pump comprises a first pump case, an impeller, a heating pipe, a second pump case and a flow guiding structure, wherein the first pump case is provided with a first inlet and a first outlet; the impeller is rotatably arranged in the first pump case and is suitable for driving fluid to flow into the first outlet from the first inlet; the axis of the impeller extends in the up-down direction; the heating pipe covers the outer side of the first pump case; the first outlet of the first pump case communicates with the internal space of the heating pipe; the second pump case communicates with the internal space of the heating pipe; and the flow guiding structure is arranged in the heating pipe to guide flow to the second pump case from the first pump case. According to the heating pump, the first pump case and the flow guiding structure are arranged to gather water flow in all impeller passages, and then the water flow is discharged out of one or multiple outlets to enable the flowing state of the water flow in a heating cavity to be steady and regular, so that the overall hydraulic efficiency of the dishwasher is improved.

The invention provides a radial guide blade of a residual heat removal pump. The radial guide blade comprises a front cover plate, a rear cover plate and a plurality of the main blades, wherein the front cover plate and the rear cover plate are respectively fixed at two ends of the main blades in uniform circumferential distribution so as to form an annular water pressing chamber, a splitter blade is arranged every two adjacent main blades, an inlet diameter D0 of each splitter blade meets that D0=0.6-0.68 (D3+D4), and outlet diameters of the splitter blades are equal to outlet diameters of the main blades. The radial guide blade has the advantages that outlet areas of a diffusing section is reduced, diffusing efficiency of the diffusing section is lowered, speed distribution of fluid in passageways of the radial guide blade is improved, vortex backflow areas are reduced, operation efficiency of the residual heat removal pump is improved, acting force of the fluid to the main blades is improved, and operation of the residual heat removal pump is enabled to be safer and more reliable.

The invention provides a turbine stator and rotor combination piece for linear projection blade and a turbine motor. The turbine stator and rotor combination piece comprises a stator and a rotor which are coaxially sleeved, wherein the stator comprises a stator body, a stator blade and a stator shroud; the rotor comprises a rotor body, a rotor blade and a rotor shroud; the inner wall of the stator shroud and the outer wall of the rotor body are coaxially sleeved; points on an outer outline line of the stator blade and an intersection line of the corresponding equivalent meridian plane form a first intersecting line; the first intersecting line is vertically intersected with a first projection straight line passing through the inside of the stator shroud; points on the outer outline line of the rotor blade and an intersection line of the corresponding equivalent meridian plane form a second intersecting line; the second intersecting line is vertically intersected with a second projection straight line passing through the inside of the rotor shroud. The turbine stator and rotor combination piece provided by the invention has the advantages of high hydraulic efficiency. The turbine motor provided by the invention has the advantages of simple structure and large torque, and is applicable to drilling boreholes with various sizes.

The invention discloses a sectional type multi-stage centrifugal pump equipped with adjustable guide vane devices. The sectional type multi-stage centrifugal pump comprises a suction section, a primary impeller, the adjustable guide vane devices, a middle section, secondary impellers, a discharge section, a pump shaft, a shaft sleeve, impeller spacer rings, a sliding bearing, a rolling bearing, a flexible connector and an external prime mover, wherein the impellers are connected and assembled on the pump shaft through keys; the adjustable guide vane devices are assembled in the middle section; the adjustable guide vane devices collect liquids pressurized by the impellers and reduce the flow velocity, and the liquids are discharged from the discharge section and sent into a pipeline system. According to the adjustable guide vane devices, the angles of guide vanes can be adjusted according to the pressure at a water pump outlet, so that the water pump operates at an efficiency optimized working point under any working condition, the hydraulic efficiency of the water pump under the working condition of part load or overload is improved, the operation efficiency of a water pump system, especially a variable-frequency or variable-flow water pump system, is improved, and the energy consumption of the water pump system is saved.

This invention relates to a punching welding standing multiple-step centrifugal pump, which comprises impeller, flow guiding part, water-in pipe and water-out pipe and outer cylinder shell. The outer cylinder shell is located with multiple-step flow guiding parts and impellers, wherein the parts comprise guiding impellers and the parts and the impellers are shaped through punching and welding. The guiding cylinder wall bends up its top end to form an end wall of a middle opening and the surround wall is plugged in another guiding opening and the multiple guiding parts are formed into one inner cylinder shell. The water-in pipe is connected to the inside of the inner cylinder shell and the water-out pipe is connected to the hollow chamber between the inner and outer cylinder shells.

The invention relates to an automatic control type efficient self sucking pump. The automatic control type efficient self sucking pump comprises a pump body, a motor, an automatic exhausting and vacuumizing device and an intelligent control box; a liquid inlet is formed in the bottom of the pump body and is connected to an inlet elbow, a liquid outlet is formed in the side surface of the pump body and is connected to an automatic blowoff valve, an outlet stand pipe is arranged on the top of a valve body of the automatic blowoff valve, and the bottom of the valve body of the automatic blowoff valve is connected to a return pipeline through a return valve; a rotation shaft of the motor is connected to a pump shaft through a coupling, a pump cover is arranged between the pump body and the motor, a cavity formed by the pump body and the pump cover is a pump cavity, and an impeller is arranged inside the pump cavity; the pump cover is provided with an inductive probe and a vacuumizing and exhausting hole, an exhausting pipeline is installed on the vacuumizing and exhausting hole, the automatic exhausting and vacuumizing device communicates with the pump cavity through the exhausting pipeline, and the motor, the inductive probe and the automatic exhausting and vacuumizing device are electrically connected to the intelligent control box through signal cables. The automatic control type efficient self sucking pump is simple and compact in structure, the self sucking function is realized by the automatic exhausting and vacuumizing device, and the hydraulic efficiency is high.

The invention relates to a hydraulic design method for an efficient and large-flow vortex pump quasi-annulus pumping chamber. Design formulas of a volute base diameter, a gap between an annular retraction cavity and an impeller, a pumping chamber wrap angle, a separation tongue helix angle, a diffusing pipe diffusion angle and a diffusing pipe height are provided. The vortex pump pumping chamber designed through the design method can well guarantee that a vortex pump is not blocked, the flowing condition inside the pump is improved under the condition that the hydraulic loss is small, the passing ability of the vortex pump pumping chamber for liquid containing impurities is improved, and the hydraulic efficiency of the vortex pump is improved.

The invention discloses a multistage deep sea mixture pump with an axial force transmission structure. The pump comprises a pump case. Two ends of the pump case are fixedly provided with an inlet pumpcover and an outlet pump cover. The other end of the outlet pump cover is fixedly connected with an outlet connecting pipe. The outlet pump cover is coaxially provided with an outlet bearing pedestal. The other end of the inlet pump cover is fixedly connected with an inlet connecting pipe, a bearing box, and a motor. The inlet pump cover is coaxially provided with an inlet bearing pedestal. The bearing box is internally provided with a bearing box shaft. One end of the bearing box, far away from a motor, extends into the inlet connecting pipe. The pump case is internally provided with a pumpshaft. One end of the pump shaft extends into the inlet connecting pipe and is connected with the bearing box by a shaft, and the other end of the pump shaft is in the outlet bearing pedestal. A plurality of stages of static pressure expanders are uniformly sleeved on the pump shaft along an axial direction in sequence. Ends of the pressure expanders, close to the inlet pump cover, are provided with closed impellers which are fixedly coupled with the pump shaft in a cooperated manner. A thrust collar is arranged between a first stage impeller and the inlet bearing pedestal. The pump is high inoperation efficiency under a working condition of high gas content, and the pump is easy to process and install.