98 results about "Pump design" patented technology

The invention provides a centrifugal pump performance optimization method and device, computer equipment and a storage medium, and belongs to the field of centrifugal pump design. The method comprises the steps that a parameterized model of a centrifugal pump impeller is established to define the geometrical shape of the centrifugal pump impeller, a design space is determined, and a plurality of sample points are generated; for each sample point, performing computational fluid dynamics simulation, adjusting inlet pressure, monitoring a ratio of simulation lift to rated lift, determining critical cavitation pressure corresponding to the sample point, and storing flow field data to construct a data set; training an agent model by using the data set; the lift, the efficiency and the critical cavitation pressure serve as targets, design variables serve as optimization variables, performance is evaluated through an agent model, global optimization is conducted through a multi-target optimization algorithm, and a target design scheme is selected from a Pareto solution set obtained through optimization. Therefore, the centrifugal pump performance under different design variables can be quickly and accurately predicted, multiple targets are effectively balanced, and a comprehensive optimization solution is provided.

The invention discloses a simulation method for a corresponding relation between a baffle tongue position and a flow field of a semi-spiral suction chamber, and relates to the technical field of double suction pump design and numerical simulation. According to the method, a three-dimensional flow channel model of multiple groups of baffle tongue reference position parameters is constructed, multi-working-condition simulation and quantitative analysis are combined, a mapping relation model of baffle tongue positions and flow field characteristic parameters is established, and a baffle tongue region vortex generation rule, turbulence dissipation and pressure pulsation characteristics are accurately captured; the optimal baffle tongue parameter interval is determined by combining the flow field uniformity and energy loss minimization principle, the flow loss is effectively reduced, the vortex strength and energy dissipation are reduced, and the flow field uniformity is improved, so that the pump efficiency is improved, the vibration noise and the cavitation phenomenon are inhibited, and the optimal baffle tongue parameter interval is obtained by adopting adaptive grid encryption, a multiphase flow cavitation model and a test verification mechanism. The mapping model is corrected by combining measured data, so that the optimization result can directly guide the baffle tongue design under different working conditions, the research and development period is remarkably shortened, and the physical test cost is reduced.

A ductless mobile air conditioner, comprising a condenser and a water sprinkling assembly. The water sprinkling assembly comprises a water tank, a water pump and a sprinkling member, wherein the water pump is configured to convey water in the water tank to the sprinkling member, the sprinkling member is provided with a plurality of water output holes, and the sprinkling member is arranged above the condenser such that water discharged from the water output holes can drop onto the condenser. The ductless mobile air conditioner has a conventional working state in which the water pump is configured to work alternately between starting and stopping. The design of the water pump to work alternately between starting and stopping can ensure the service life of the water pump.

The invention relates to the technical field of water pumps, in particular to a novel low-cavitation sectional multi-stage pump. Two smaller first-stage impellers are adopted on the premise that the design flow of the two first-stage impellers is 1 / 2 of the design flow of the water pump; the two first-stage impellers are installed in series and are each independently provided with a guide vane. A first guide vane outlet and a second guide vane outlet are communicated through a runner cavity, so that the parallel operation state of two small first-stage impellers is realized; therefore, a single first-stage impeller only needs to bear 1 / 2 of the running flow of the pump, and the cavitation performance of the first-stage impeller can be greatly reduced; and finally, the net positive suction head can be consistent with that of a traditional first-stage double-suction stage type multi-stage pump, but the structure is more compact and simpler, and the efficiency is higher.

The invention discloses a method for optimizing key structure parameters of a deep well electric submersible pump based on performance simulation, and relates to the technical field of design optimization of electric submersible pumps, a three-dimensional geometric model of a deep well submersible centrifugal pump is built in advance, the three-dimensional geometric model comprises an impeller, a guide shell, a pump shaft, a pump shell, an upper connector, a lower connector and a full-flow-channel structure, and initial structure parameters are calibrated; and establishing a centrifugal pump simulation model based on a computational fluid dynamics technology, performing fluid domain extraction, grid division and grid independence verification on the three-dimensional geometric model, and setting fluid attributes, boundary conditions and a turbulence model. According to the method, a closed-loop iteration framework for simulation, optimization, evaluation and feedback is constructed by adopting a mode of coupling a computational fluid dynamics simulation technology and a genetic algorithm, the limitation of local parameter optimization in the prior art is broken through, systematic and collaborative optimization of key structure parameters of the submersible centrifugal pump is realized, and the method is suitable for large-scale popularization and application. And the efficiency of the optimization process and the final optimization effect are obviously improved.

The invention discloses a hybrid vehicle oil pump control method and related equipment, and relates to the technical field of hybrid vehicles, the method comprises the following steps: obtaining a driving mode of a target vehicle; based on the driving mode, engine lubrication required power and motor lubrication required power are determined; according to the engine lubrication required power and the motor lubrication required power, target control power of a duplex electronic oil pump is determined; and based on the target control power, a rotating speed control instruction is sent to a motor driving the duplex electronic oil pump. Through the design of the integrated oil pan and the duplex electronic oil pump and in combination with an intelligent lubrication control strategy based on a driving mode, structure simplification, cost reduction and efficient and reliable multi-working-condition lubrication management are achieved, and the performance and stability of the whole vehicle can be improved.

The embodiment of the invention discloses a hydraulic system of a filling industrial pump, relates to the technical field of industrial pumps, and can effectively reduce the influence of reversing of the filling industrial pump on slurry conveying. The filling industrial pump hydraulic system comprises a first main pump, a second main pump, a third main pump, a first hydraulic cylinder, a second hydraulic cylinder, a first main valve, a second main valve and a third main valve. The first main valve is connected with the first main pump and the first hydraulic cylinder so that hydraulic oil of the first main pump can flow into the first hydraulic cylinder through the first main valve. The second main valve is connected with the second main pump and the second hydraulic cylinder so that hydraulic oil of the second main pump can flow into the second hydraulic cylinder through the second main valve. The third main valve is connected with the third main pump, the first main valve and the second main valve so that hydraulic oil of the third main pump can flow into the first hydraulic cylinder through the third main valve and the first main valve, or the hydraulic oil of the third main pump can flow into the second hydraulic cylinder through the third main valve and the second main valve. The method is suitable for filling industrial pump design and application scenes.

This application belongs to the field of pump design technology, and particularly relates to a design verification method for the balance disc and motor electromagnetic components in a long-life pump system. The design verification method includes: Step 1, after integrating the design of the balance disc and motor electromagnetic components in the centrifugal pump system, determining the motor air gap and the outer diameter of the balance disc; Step 2, designing the parameters to be optimized in the balance disc; Step 3, using a fault diagnosis model, verifying the sliding bearing eccentricity fault of the centrifugal pump system containing the designed balance disc under operating conditions. If the verification fails, return to Step 2; otherwise, the verification is considered successful. This application ensures that the designed motor rotor diameter meets electromagnetic performance requirements, and the balance disc also has stronger balancing capabilities. Furthermore, it guarantees through verification that the designed balance disc will not cause sliding bearing eccentricity faults; significantly improving the overall performance and safety of the centrifugal pump system, while extending the lifespan of the centrifugal pump system.

The utility model discloses a magnetic rotary vane pump, and belongs to the technical field of rotary vane pumps. According to the magnetic rotary vane pump, the pump shaft input end is combined with the inner magnetic cylinder, and the isolation sleeve of the inner magnetic cylinder is connected with the pump body in a sealing manner, so that the pump body is absolutely sealed at the pump shaft input end, the problem of medium leakage at the pump shaft input end is avoided, and the safety of the pump body during working is improved; meanwhile, an independent oil chamber is adopted in the pump body to lubricate the mechanical seal of the pump shaft, so that the stability of the mechanical seal under long-time work is guaranteed, the mechanical seal can operate for a long time under the medium gasification environment, the service life of the mechanical seal is prolonged, and the risk of medium leakage is further reduced; the rotary vane pump is scientific and reasonable in design, simple and novel in structure, convenient to machine, low in manufacturing cost and high in practicability.

A fluid pump (1) comprising a motor (10), a pump head (20), and a cooling sleeve (30). The motor (10) includes a stator assembly (11) and a circuit board assembly (13) located at one axial end of the stator assembly (11). The pump head (20) and the other axial end of the stator assembly (11) together enclose a cavity (40). The pump head (20) is provided with a fluid inlet (210) and a fluid outlet (211) that communicate with the cavity (40), and coolant is designed to enter the cavity (40) via the fluid inlet (210) and is then expelled from the fluid outlet (211). The cooling sleeve (30) is attached to the outside of the stator assembly (11) and is thermally connected to the circuit board assembly (13), and the cooling sleeve (30) and the outer circumferential surface of the stator assembly (11) together enclose a cooling channel (50).The stator assembly (11) is further provided with an inlet channel (60) and an outlet channel (70) to form the cooling channel (50) and the cavity (40), so that at least some of the coolant in the cavity (40) can enter the cooling channel (50) from the inlet channel (60) and then flow back into the cavity (40) from the outlet channel (70) to dissipate the heat generated by the circuit board assembly (13) and the heat transferred to the cooling sleeve (30). The fluid pump (1) has a simple design, occupies little space, and effectively dissipates the heat for an electronic control unit of the motor.

A drive unit (100) for a motor vehicle (105) comprises a machine housing section (300) with an electric machine (115) and a transmission housing section (305) with a transmission (130), as well as a hydraulic system (135) for cooling and / or lubricating thermal and / or mechanical consumers in the machine housing section (300) and in the transmission housing section (305). The hydraulic system (135) comprises a pump system (200, 600) with a first pump (601). The machine housing section (300) has a first suction point (310) which is hydraulically connected to the first pump (601) via a first suction line (225), and the transmission housing section (305) has a second suction point (400) which is hydraulically connected to the first pump (601) via a second suction line (230). Here, the first pump (601) is designed as a gear pump, which includes more than two externally toothed pump gears (611, 612, 613).

One embodiment of the present invention provides a technology that optimally designs a single-channel pump and improves performance such as high efficiency and low vibration of the single-channel pump. A method of designing a single-channel pump according to an embodiment of the present invention includes a first step of determining a shape of a volute and setting a plurality of points inside and outside the volute, a second step of selecting a target value, which is a value for a performance numerical value of the single-channel pump, and determining a shape of an impeller suitable for the target value, a third step of setting an analytical cross-sectional area, which is a channel cross-sectional area that adjoins inner and outer points in the volute, and setting a plurality of analytical cross-sectional areas for a plurality of portions in the volute, a fourth step of setting a structure design variable, which is a structural variable of the single-channel pump, and deriving the target value by a numerical analysis, and a fifth step of deriving, as a design plan, a structure design variable value that is a value of the structure design variable that allows the target value to satisfy a preset set target value.

The utility model relates to a hydraulic control system for a hybrid power box and a vehicle, and the hydraulic control system comprises a hydraulic oil way which comprises a main oil way and a working oil way, and the working oil way comprises a low-pressure oil way and a high-pressure oil way; the oil supply module is connected with the main oil way; the pressure switch valve is arranged on the high-pressure oil way and is used for controlling the on-off of the high-pressure oil way; the oil way switching valve is arranged among the main oil way, the low-pressure oil way and the high-pressure oil way and used for switching the communication state of the main oil way and the low-pressure oil way or the high-pressure oil way; the feedback cavity communicates with the high-pressure oil way through a feedback oil way, and the feedback oil way is located between the pressure switch valve and the oil way switching valve. According to the scheme, a traditional double-pump design is abandoned, high-low pressure automatic switching under driving of a single oil supply module is achieved, hardware is reduced, and cost is reduced; the feedback cavity of the oil way switching valve and the high-pressure oil way form linkage design through the feedback oil way, automatic switching of the oil flow direction can be achieved, external control signal intervention is not needed, control logic is simplified, and reliability is improved.

The invention belongs to the field of water pump runner blade design, and particularly relates to a water pump runner with an S swept shape, a design method and an optimization method thereof. The method comprises the steps that 1, a rotating wheel three-dimensional parameterized model is established, axial coordinates z, radial coordinates r and circumferential wrap angles theta of control points P1-P5 serve as design variables, hydraulic efficiency eta and lift H serve as optimization targets, and iterative optimization is conducted through a multi-target genetic algorithm; 2, constraint conditions in the optimization process include that the curvature radius change rate between adjacent control points is smaller than or equal to 15%; the maximum deflection of the S-shaped curve of the outlet edge is less than or equal to 0.1 D0; the rounding radius ratio RP2 / RP4 belongs to [1.5, 2.0]; and 3, fitting the relationship between the design variable and the target function through the response surface model, and finally outputting a Pareto optimal solution set. The problem that an existing water pump is single in design parameter is solved, blade surface pressure gradient distribution is improved, the vortex intensity of a wake flow area is reduced, and the performance and efficiency of the water pump are improved.

The present invention discloses an integrated system for heavy oil injection and production by using a small oil pipe to launch and salvage an electric pump, comprising an outer heat injection string and an inner production string, wherein the production string comprises a small oil pipe, an electric submersible pump connector, and an inverted electric submersible pump from top to bottom, and the electric submersible pump connector is provided with a second guide flow hole. The present application involves less ground operation equipment, high operation efficiency, and saves operation resources and costs; a small oil pipe is selected as the output fluid output channel to avoid fluid immersion and scouring in the annulus between the inner production string and the outer heat injection string, thereby protecting the thermal insulation performance of the insulated oil pipe and the insulation performance of the cable, and reducing the risk of failure; the electric submersible pump unit adopts an inverted pump design, and the cable is directly connected to the electric submersible pump motor after passing through the upper production packer, reducing the risk of cable crushing and improving the operating stability of the electric submersible pump in highly deviated wells; the small oil pipe has a strong launching and salvaging capability, and can realize launching and salvaging of the electric submersible pump in highly deviated wells and horizontal wells.

The application discloses a kind of blade pump cavitation induced noise numerical prediction method, the application provides a kind of blade pump cavitation induced noise numerical prediction method based on test, this method not only can be predicted the monopole noise generated by the cavity volume pulsation under the condition of blade pump cavitation, but also can predict the flow induced noise except monopole noise.The high-precision unsteady cavitation numerical calculation of the application can provide accurate sound source information for subsequent acoustic calculation, to improve the accuracy of acoustic numerical prediction, the prediction result is applied to the low-noise hydraulic design of blade pump, which can reduce the number of tests, shorten the development cycle, save development cost, thereby improve the efficiency of low-noise blade pump design;On the other hand, it can reveal the time-space evolution characteristics of vortex structure inside blade pump and the coupling mechanism of vortex and cavitation in the process of cavitation unsteady flow, to provide theoretical support for early-stage design or later-stage optimization of blade pump.

A method of designing an artificial lift system for producing fluid from a wellbore includes receiving wellbore data indicating configuration specifications and production specifications for the wellbore and identifying a plurality of candidate electrical submersible pump (ESP) designs for implementing in the wellbore based on the wellbore data. The method further includes determining a design score for each of the plurality of candidate ESP designs, the candidate ESP designs each indicating a collection of downhole components defining an ESP system. The design score is based on inventory data for an inventory of available downhole components and historical wellbore data, the historical wellbore data indicating historical conditions for the wellbore and historical production performance for the wellbore. The method further includes selecting an ESP design from the plurality of candidate ESP designs based on an associated design score best fulfilling one or more criteria.

Hydraulic braking system (30) for a land vehicle, with at least one wheel brake (48, 50) assigned to a wheel of the land vehicle; a master brake cylinder (36) which is hydraulically connected to the at least one wheel brake (48, 50), wherein the master brake cylinder (36) is configured to move hydraulic fluid into the at least one wheel brake (48, 50) when the brake system (30) is actuated by the driver; a pump (58) whose output is hydraulically connected to the at least one wheel brake (48, 50) and the pump (58) is designed to move hydraulic fluid into the at least one wheel brake (48, 50); a variety of valve arrangements (42, 44, 46, 54, 56, 60); a control unit (68) configured to control the pump (58) and the plurality of valve arrangements (42, 44, 46, 54, 56, 60); and an intermediate storage tank (10) which is hydraulically connected to the at least one wheel brake (48, 50) and an inlet of the pump (58), wherein the intermediate storage tank (10) includes a return element and is configured to - to accommodate a hydraulic fluid reserve volume during a rest state of the brake system (30), - to provide the pump (58) with the absorbed hydraulic fluid reserve volume during an actuation state for displacement into the at least one wheel brake (48, 50), and the return element comprises a piston (16) limiting the intermediate storage (10) and a first spring (22) acting on the piston (16), characterized in that the restoring element further comprises a second spring (24), wherein the first and the second spring (22, 24) are arranged such that the first spring (22) causes a restoring force directed in a first direction and the second spring (24) causes a restoring force directed in a second direction.

The utility model discloses a long-acting large-displacement oil lubrication plunger pump, and belongs to the technical field of plunger pump design and manufacturing. The long-acting large-displacement oil lubrication plunger pump further comprises a pair of electric cylinders fixedly connected to the left end face of the first right partition plate. The inner side end faces of the pair of second partition plates are fixedly connected with a pair of oil storage blocks correspondingly. The inner sides of the pair of second partition plates at the same height are slidably connected with sliding rods. A liquid channel is formed in the inner side of each sliding rod; each sliding rod is fixedly connected with the output end of the adjacent electric cylinder; a pair of second one-way valves is embedded in the two ends of the inner side of each liquid channel. A first one-way valve is embedded in the position, corresponding to the oil storage block, of each second partition plate. Two pairs of first one-way valves, two pairs of second one-way valves and two electric cylinders are arranged, so that two sliding rods move oppositely, hydraulic oil is continuously input into a pump outlet, long-acting large-displacement oil pumping is achieved, and meanwhile residual hydraulic oil on the inner side of an oil storage block can be used for oil lubrication.

The application provides a condensate water pressurizing system and method, belonging to the technical field of water pump design, comprising: a first end of a data processing module is connected to a condensate pump control module, and a second end of the data processing module is connected to an input end of a frequency conversion module; the data processing module is used for acquiring a rotating speed signal and a power signal of the condensate pump collected by the condensate pump control module; the data processing module is also used for obtaining a water pump rotating speed control signal based on the rotating speed signal and the power signal, and sending the water pump rotating speed control signal to the frequency conversion module; a first end of a water pump pressurizing module is connected to an output end of the frequency conversion module, and a second end of the water pump pressurizing module is connected to the condensate pump; the water pump pressurizing module is used for receiving the water pump rotating speed control signal output by the frequency conversion module, and driving the condensate pump based on the water pump rotating speed control signal. Through the cooperative control of the modules, the rotating speed and the pressure of the primary and secondary shaftless pumps are dynamically adjusted based on real-time working conditions, so that the anti-cavitation capacity of the condensate water system is improved.

The invention discloses a pet water dispenser main machine integrating control and a water pump, and the pet water dispenser main machine comprises a main machine shell, an upper cover, a bottom cover, a water outlet nozzle, a main control PCB, a living body sensor, a water pump rotor, a rotor driving device and an upper volute. Wires and water pipes are not arranged outside, water and electricity separation is achieved, the risk of electric leakage is avoided, the sealing performance is good, and waterproof glue is poured into the whole inner cavity of the host shell. In addition, the water pump rotor, the upper volute and the rotor sleeve of the water pump rotor can form an integral rotor module, the rotor module and the main machine shell can be integrally installed and disassembled, replacement is convenient, and the assembling efficiency is improved.

This application belongs to the field of pump design technology, and particularly relates to an integrated design method for the balance disc and motor electromagnetic parameters in a long-life pump system. The design method includes: based on the balance disc's outer diameter and the motor's air gap, using a genetic algorithm to solve for the set of alternative solutions for the motor air gap that maximize the coupled axial balance force objective function and minimize the coupled additional shaft power objective function; calculating the theoretical minimum outer diameter of the balance disc and the maximum allowable outer diameter of the motor under each alternative motor air gap solution; then performing a spatial feasibility check based on the maximum allowable outer diameter of the motor to select a reasonable value for the motor air gap; determining the optimal motor air gap by solving for the maximum comprehensive objective function; and using the maximum allowable outer diameter of the motor corresponding to the optimal motor air gap as the outer diameter of the balance disc for design. This application combines the design requirements of the balance disc with the optimization process of the motor's electromagnetic parameters, significantly improving the overall performance of the centrifugal pump system.

Pump for a washing machine, comprising a pump chamber with an inflow, an outflow and a pump chamber bottom, an impeller for guiding water in the pump chamber and optionally a plurality of guide vanes radially outside the impeller, which vanes are stationary and extend helically towards the pump chamber bottom. The pump is designed in the form of a centrifugal pump. According to the invention, at least one curved or bent guide vane is arranged on at least one guide vane or on a support ring below the impeller.

The application discloses a double-outlet cleaning machine pump, a design method of the pump and a cleaning machine, and relates to the technical field of cleaning machine pumps. The double-outlet cleaning machine pump comprises a volute and an impeller, wherein the impeller is driven to rotate by a motor and adopts a back-bent blade structure, the volute channel section is rectangular, and the flow channel is divided into two parts, i.e. an inner volute and an outer volute, which are connected with two independent water outlets, thereby meeting the double-water-path water supply requirement of the cleaning machine. The design method designs the volute structure through a mathematical analysis method, including calculation formulas of a partition tongue angle, a base circle diameter, an inlet width and a section boundary of different volute sections, establishes efficient design of the partition plate type and the partition tongue type volutes under different flow conditions, realizes full diffusion of water flow in the double-flow channels of the volute and efficient conversion of the water flow into pressure energy, and can meet the different water outlet quantity and head requirements of the double-water-path at the same time. The pump has the advantages of compact structure, efficient operation, convenience in integration into a modern dish washing machine system and excellent hydraulic performance and practical value.

An arrangement enables production of a multiple displacement pump designed to be activated either with a pneumatic or an electric drive from extensively similar parts or retrofitting of such a pump from one drive type to the other drive type with little effort. For this purpose, the displacer elements can be connected by way of a connection device that can be extended through a lid of the fluid chambers, so that optionally a mechanical actuator can be affixed, which can be connected to an electric drive or to a control valve.

The utility model relates to an axially split pump O-shaped ring sealing structure which comprises a pump body O-shaped ring, a mechanical sealing O-shaped ring and a mechanical seal, a high-pressure area and a low-pressure area are arranged in a pump body, the pump body O-shaped ring is arranged between the high-pressure area and the low-pressure area, and the mechanical sealing O-shaped ring is arranged at the position matched with the mechanical seal. During assembly, the pump body and the pump cover are connected through a fastening bolt between the pump body and the pump cover, and the bolt tightly presses the O-shaped ring of the pump body in the horizontal direction. At the position matched with the mechanical seal, the O-shaped ring groove of the pump body rotates by 90 degrees and is changed into the direction perpendicular to the shaft, and then when the mechanical seal is assembled, the O-shaped ring of the mechanical seal is in the vertical direction at the middle opening face position, and the O-shaped ring of the pump body is in the horizontal direction at the position matched with the mechanical seal at the middle opening face position; and the mechanical sealing O-shaped ring and the pump body O-shaped ring are crossed. According to the utility model, the middle-open type pump can be designed to have higher pressure and temperature, and the reliability of equipment operation is ensured.

The application discloses a design method of a two-stage high-speed axial propelling pump suitable for a shallow water working condition, and the two-stage high-speed axial propelling pump comprises a primary-stage impeller and a secondary-stage impeller, and is specifically implemented according to the following steps: according to the actual lift of the primary-stage impeller and the actual lift of the secondary-stage impeller, the actual design lift of the underwater vehicle in the design working condition is determined through a water jet propelling pump thrust and vehicle resistance balance equation; the cascade of the primary-stage impeller and the secondary-stage impeller is respectively designed by using a lift method, the section shape of the primary-stage impeller and the secondary-stage impeller is taken as an airfoil, the best airfoil shape in terms of anti-cavitation performance is selected, parameters in the actual design lift of the underwater vehicle in the design working condition are corrected according to the fluid dynamic characteristics of the airfoil, and the design of the two-stage axial pump impeller is completed; the two-stage axial pump for the underwater vehicle in the shallow water high-speed working condition can be quickly and efficiently designed, and the anti-cavitation performance requirement is met.

The utility model discloses a highly integrated electric pump, relates to the technical field of water pumps, and solves the technical problems that a traditional water pump is high in energy consumption, large and heavy in body, easy to leak and inconvenient to maintain, the highly integrated electric pump comprises an outer shell body, a shell cover, motors and an impeller, the two motors are symmetrically installed in the outer shell, and hollow shafts of the two motors accurately correspond to opening ring positions at the two ends of the impeller. A stable driving structure is formed through tight connection, and sealing treatment is conducted through the shell cover, so that the safety and stability of operation of the electric pump are effectively guaranteed; the simplified design of the utility model not only reduces the cost, but also improves the maintainability and reliability of the system; the highly integrated electric pump design is particularly suitable for occasions requiring high reliability and low maintenance, the structure is simplified, the size is reduced, and the operation stability is remarkably improved.

This application relates to the field of Roots pump design technology, specifically to a method for designing the rotor profile of a Roots pump based on pin tooth arcs. The method includes: Step 1: Designing a basic rotor profile based on pin tooth arcs; Step 2: Dividing the basic profile into four segments; Step 3: Improving the top pin tooth arc with the rotor center as the center and the highest point of the rotor as the radius to form a sealing arc; Step 4: Improving the waist pin tooth arc with the rotor center as the center and the apex of the rotor as the radius; Step 5: Completing the design of the Roots pump rotor profile. The improved Roots pump rotor pin tooth arcs mesh only at the moment of perpendicular meeting during rotation, with the meshing occurring at other times achieved by quadratic curves and conjugate curves. By improving the rotor profile of the Roots pump, the effective pumping speed, compression ratio, and ultimate vacuum of the Roots pump are further improved, noise is reduced, and the overall technical specifications of the product are enhanced.

A deep-well high-speed vertical pump having dynamic pressure-balanced dynamic seal, relating to the technical field of deep-well pump design. Upper and lower end covers are respectively threadedly connected to two ends of a pump housing; liquid inlets are formed in the lower end cover; a stator winding is fixed to the upper portion of the inner wall of the pump housing; an opening end of an annular cylinder of an annular differential pressure balancer faces downward and is threadedly connected to the lower portion of the inner wall of the pump housing; an annular piston is slidably and sealedly inserted in the annular cylinder; balance holes are formed in a closed end of the annular cylinder; a reset spring is supported between the annular piston and the lower end cover; a hollow main shaft of a rotor assembly is rotatably mounted between the upper end cover and the lower end cover; a silicon steel sheet is fixed to the upper portion of the outer wall of the hollow main shaft; O-shaped dynamic seal rings are provided between the hollow main shaft and the annular cylinder and between the hollow main shaft and the upper end cover; and a spiral strip is arranged around a central shaft and is connected and fixed to the inner wall of the hollow main shaft by means of welding points. The hollow main shaft of the motor rotor assembly is used as a flow channel, and the spiral strip is welded to the inner wall of the hollow main shaft, such that the pump is not prone to wear. The annular differential pressure balancer is additionally provided to avoid leakage at a dynamic seal position in a high-pressure environment.