1093 results about "Centrifugal pump" patented technology

The invention discloses a centrifugal pump flow dynamic detection system based on the Internet of Things, and relates to the technical field of intelligent sensing systems. Comprising a data acquisition module used for acquiring multi-source signals in real time and obtaining a sensing feature data set after preprocessing; the physical property parameter module is used for calculating the influence parameters of the physical property change of the medium on the pump performance based on the sensing characteristic data set to obtain a medium physical property parameter set; the flow prediction module is used for correcting a preset flow prediction model through the medium physical property parameter set to obtain a corrected flow prediction model; inputting a sensing characteristic data set acquired in real time into the corrected flow prediction model, and outputting to obtain a flow prediction value; the traffic detection module is used for judging whether the current traffic is abnormal or not based on the traffic predicted value, the historical traffic data and a preset operation threshold parameter set, and giving a traffic detection result; the influence of medium physical property changes on flow detection can be accurately captured, and the accuracy and stability of flow detection are improved.

The invention discloses an energy-saving air conditioner fan circulating water pump and a control method, and relates to the technical field of energy-saving household appliances, and the energy-saving air conditioner fan circulating water pump comprises a motor, a peristaltic pump shell, a peristaltic pump rotor and a centrifugal pump shell. The front end of the motor output shaft is connected with a fan; a plurality of extrusion wheels are arranged on the peripheral side of the peristaltic pump rotor, when the peristaltic pump rotor is in a first state, the extrusion wheels are matched with the peristaltic pump shell to extrude the elastic hose, the peristaltic pump rotor is in transmission connection with the output shaft, and when the peristaltic pump rotor is in a second state, the peristaltic pump rotor is separated from the output shaft; the extrusion wheel is separated from the elastic hose, the centrifugal pump shell is connected to the rear end of the peristaltic pump shell, an impeller is arranged in the centrifugal pump shell and connected to the rear end of the output shaft, the centrifugal pump shell is connected with a first water inlet pipe and a first water outlet pipe, and the first water outlet pipe is communicated with the water inlet end of the elastic hose. According to the centrifugal pump, one motor can be used for driving the fan and the impeller in the centrifugal pump shell, and energy consumption is reduced.

The invention discloses a centrifugal pump variable working condition stabilizing system and method based on multi-stage guide vanes, and belongs to the field of fluid mechanical control. The system is a closed-loop control system and comprises a state sensing module, a stability evaluation and prediction module, a multi-stage guide vane cooperative control decision module and an execution driving and feedback module. The system monitors the running state of the pump in real time, evaluates and predicts the stability, and then generates an adjusting instruction which aims at the multi-stage guide vane and is collaboratively optimized in the aspects of angle, direction and time sequence according to a grading response strategy, and the unstable flowing phenomena such as rotating stall and surge are actively restrained. The multi-stage guide vane is used as a distributed active flow control actuator, the stable operation range of the centrifugal pump is remarkably widened through an intelligent cooperation strategy, the operation safety and reliability in the variable working condition and transient process are improved, and the beneficial effects of being high in self-adaptive capacity and high in control efficiency are achieved.

The application discloses a kind of centrifugal pump shafting critical speed calculation method, including the finite element calculation of radial roller bearing and thrust roller bearing stiffness coefficient curve, the prestressed modal analysis and critical speed calculation of centrifugal pump shafting considering different bearing stiffness coefficient.The setting of constraint condition of this method is in line with actual situation, which can realize the accurate calculation of centrifugal pump shafting critical speed, and help to improve the reliability of safety check of centrifugal pump shafting in design stage, at the same time, the calculation steps are simple, and the engineering application range is wide.

The utility model discloses an anti-loose sleeve structure for an impeller of a centrifugal pump. The anti-loose sleeve structure comprises the impeller, an anti-loose piece, a mounting shaft and a limiting piece. One end of the mounting shaft is connected with the driving piece, and the other end of the mounting shaft penetrates through the impeller and is connected with the limiting piece; an anti-loosening piece is arranged between the limiting piece and the impeller; and the anti-loosening piece is arranged on the outer side of the limiting piece in a sleeving mode and connected with the limiting piece in a clamped mode, one end of the anti-loosening piece abuts against the limiting piece, the other end of the anti-loosening piece abuts against the end face of the impeller, and the anti-loosening piece is configured to prevent the limiting piece from rotating. The technical problem that in the prior art, an impeller nut is prone to loosening under complex working conditions is solved, simple and reliable mechanical locking of the impeller nut is achieved, and meanwhile abrasion caused by rotation of an anti-loosening structure is avoided.

The utility model relates to the technical field of impeller flow passage self-adjusting gradually-changing flow direction centrifugal pumps, and discloses an impeller flow passage self-adjusting gradually-changing flow direction centrifugal pump body which comprises a bearing assembly, a main machine body, a speed measuring assembly, a driving assembly and a flow sucking assembly, the main machine body is installed above the bearing assembly, the speed measuring assembly is installed at the front end of the interior of the main machine body, and the driving assembly is installed at the front end of the interior of the main machine body. The driving assembly is installed at the rear end in the main machine body, and the flow suction assembly is installed in the middle in the main machine body. The speed measuring assembly is arranged, so that the running speed of the output end of the driving motor can be automatically adjusted according to actual working conditions according to the flow speed of water flow and matched work of the rear driving motor, and it is ensured that the pump always runs in a high-efficiency area; the driving assembly and the flow suction assembly are arranged, the suction condition of the pump can be effectively improved, and the critical cavitation allowance of the pump is reduced by optimizing the flow channel design and the inlet throat area, so that the cavitation phenomenon is reduced, and the cavitation resistance of the pump is improved.

The invention discloses a forming method for a bent blade of a stamping and welding centrifugal pump, and relates to the field of centrifugal pump blades, which comprises the following steps: S1, three-dimensional modeling and plane unfolding; s2, wire cutting; s3, mold forming; s4, performing three-dimensional scanning; s5, arc analysis; s6, contour analysis; s7, clamping adaptation and gap detection; and S8, molding quality verification. According to the method, a stamping forming process and a three-dimensional scanning feedback technology system are combined, a closed-loop precision control system is formed, after stamping forming, a three-dimensional scanner is used for rapidly obtaining actual profile point cloud data of the blade, the actual profile point cloud data is compared with a design model in a high-precision mode, and profile deviation caused by springback is accurately quantified. And based on the deviation data, carrying out reverse compensation correction on the molded surface of the mold. The problems of profile out-of-tolerance and welding assembly clearance caused by springback are solved, and high-precision, high-efficiency and high-consistency manufacturing of the centrifugal pump bent blade is achieved.

The invention relates to the technical field of soil and groundwater pollution remediation, in particular to a polluted groundwater source controlling and breaking system suitable for limited space of an industrial accumulation area, which comprises a main well, a gas stripping circulating unit and a groundwater circulating unit. A blocking device composed of a packing rubber structure and a driving device is arranged in the main well, the packing rubber structure is driven by the driving device to move and intermittently inject air to expand, and an air flow channel which is dynamically opened and closed is formed between the inner wall of the main well and the unsaturated area. The vacuum pump device builds negative pressure on the upper portion of the main well, so that purified clean gas enters an unsaturated area in an intermittent pulse mode through the peripheral injection well, and soil gas is induced to flow in an oscillating mode under cooperation of the dynamic gas flow channel. Groundwater extracted by the centrifugal pump is purified by the gas stripping area and the underground activated carbon filtering device and then is discharged into the top of the unsaturated area through the drainage device in an intermittent wave mode, the system is suitable for pollution treatment in the limited space of the industrial accumulation area, and targeted source control and long-acting reduction are achieved.

The invention discloses a centrifugal pump blade damage suppression design and optimization method based on multi-physics field coupling, which comprises the following steps: constructing a fluid grid model of a centrifugal pump and carrying out transient flow field numerical simulation comprising a cavitation model and a dispersed phase model to obtain transient flow field simulation results of a cavitation field and a dispersed phase motion field; according to the transient flow field simulation result of the cavitation field, cavitation collapse wall surface energy is calculated, and a first correlation model of the blade geometric parameters and cavitation collapse energy is established; according to a transient flow field simulation result of the dispersed phase motion field, calculating particle impact wall surface energy, and establishing a second correlation model of the geometric blade parameters and the particle impact wall surface energy; and according to the first correlation model and the second correlation model, the cavitation collapse energy and the particle impact energy are controlled to suppress damage generated by multiple physical fields coupled with cavitation and particle impact, and multi-objective optimization is carried out in a mode of minimizing the cavitation collapse energy and minimizing the particle impact energy, so that optimal blade parameters are determined.

The invention discloses a sewage treatment plant equipment fault diagnosis method based on multi-scale adaptive feature extraction, and belongs to the technical field of equipment intelligent operation and maintenance. According to the method, after adaptive filtering and quality evaluation are carried out on a vibration signal, an adaptive decomposition strategy fusing VMD and improved EMD is adopted, and a modal number and parameters are optimized according to an information entropy criterion; extracting multi-scale features from three levels of micro-scale (instantaneous characteristics), mesoscale (local statistics) and macro-scale (global energy / entropy), and screening key features through mutual information and a two-layer fusion mechanism; a health index model is constructed, and normal, attention, warning and danger four-level dynamic early warning is achieved; and meanwhile, a self-adaptive fault knowledge base capable of being incrementally updated is established in combination with density clustering and a Markov chain. According to the method, the fault identification accuracy and the system self-adaptive capacity are remarkably improved, and the method is suitable for intelligent diagnosis of sewage treatment key equipment such as a centrifugal pump and a Roots blower.

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 belongs to the technical field of centrifugal pump production, and particularly relates to a multi-stage centrifugal pump impeller strength automatic detection system and method.The multi-stage centrifugal pump impeller strength automatic detection system comprises a lifting turnover assembly, a horizontal plate base, a clamping assembly, a cover plate strength detection assembly and a blade strength detection assembly, and the clamping assembly used for clamping and locking a combined closed impeller is arranged below the horizontal plate base; a lifting and overturning assembly used for driving the clamping assembly to conduct lifting and horizontal overturning actions is installed on the upper side of the horizontal plate base. A cover plate strength detection assembly used for detecting the strength of the front cover plate, the rear cover plate or the annular rotating plate is installed on the horizontal plate base, and a blade strength detection assembly used for detecting the strength of blades rotating downwards in different directions is installed on the horizontal plate base. The device is reasonable in design, and meets the requirement for automatic detection of the strength of the cover plate and the blades in the combined closed impeller in different rotation directions.

The invention discloses a safe operation control method for a permanent magnet motor centrifugal pump, and particularly relates to the technical field of operation control of permanent magnet motor driving fluid equipment. Operation state parameters of a permanent magnet motor side and a centrifugal pump side are synchronously collected in the stages of covering starting, steady-state operation and working condition change, a continuous operation state sequence is formed, and a dynamic feature vector is constructed; judging whether an abnormal development stage exists or not, and forming a judgment result when an abnormal development trend exists; constructing and predicting a plurality of control action sequences according to a judgment result, determining an operation interval, and selecting the control action sequences for execution; according to the method, the abnormal development trend is recognized by constructing the dynamic feature vector, the influence of different control actions on the operation state is predicted on the basis, and the control action sequence meeting the operation safety requirement is selected for execution, so that the abnormal recognition accuracy is improved, the control decision risk is reduced, and the operation safety of the permanent magnet motor centrifugal pump is enhanced.

The invention relates to the technical field of oil field oil production engineering, in particular to an underground data acquisition unit with flow, pressure and temperature monitoring functions and a method. The method is suitable for underground working condition monitoring of submersible motor type lifting equipment such as submersible screw pumps, submersible plunger pumps and submersible centrifugal pumps. The unit comprises a pressure-resistant shell, wherein a central pipe, an electromagnetic flowmeter, two pressure and temperature sensors and an underground parameter collector are integrated in the pressure-resistant shell; the two sensors are used for measuring the temperature and pressure of liquid flow of the central pipe and the temperature and pressure of an oil casing annulus respectively; the electromagnetic flowmeter measures the flow, and real-time temperature and pressure data are used for compensation to improve the precision. The unit is further provided with a collecting pipe, an upper end, a lower end, a connecting sliding ring, an annulus / oil pipe inner testing channel, a sealing rubber ring and the like. Through the integrated design, synchronous high-precision in-situ monitoring of underground key parameters is achieved, the problem that underground data of multiple instruments are not synchronous is solved, and a reliable data terminal is provided for an intelligent oil field.

The application relates to the technical field of centrifugal pumps, and particularly discloses a high-sealing non-variable-volume pump and components thereof, which comprises a pump shell and an impeller, a water inlet and a water outlet are respectively arranged on the pump shell, the pump shell is in a volute type, the volute type comprises a wide section and a narrow section, and the pump shell further comprises a flow assisting mechanism which comprises a flow distribution port and a flow distribution sleeve arranged on the narrow section of the pump shell, a plurality of liquid inlet holes are arranged in a circular array on the water inlet, and the flow distribution sleeve is covered on the flow distribution port and the liquid inlet hole at two ends respectively. In the application, the flow distribution sleeve guides the fluid into the flow distribution sleeve along the flow distribution port at the narrow section of the volute type with the largest pressure during the operation of the impeller, then the flow distribution sleeve supplements the fluid to the water inlet of the pump shell, and the negative pressure at the water inlet is supplemented to reduce the cavitation and prolong the service life of the centrifugal pump.

The invention relates to the technical field of gelatin adding, in particular to an electrolytic copper foil gelatin adding system based on a centrifugal pump. A data acquisition unit; the rotating speed setting unit is used for determining the rotating speed of the centrifugal pump according to the gelatin state and the comprehensive evaluation coefficient or the comparison temperature value, and determining whether to adjust the rotating speed of the centrifugal pump or not according to the fluctuation degree of the flow in the pipe; the opening degree setting unit is used for determining whether to adjust the electric adjusting valve or not based on the rotating speed adjusting coefficient and adjusting the opening degree of the electric adjusting valve according to the comprehensive evaluation value and the flow in the pipe when the electric adjusting valve is adjusted; and the stirring setting unit is used for determining whether to stir the gelatin solution in the gelatin tank or not according to the pressure in the pipe under the condition that the setting of the opening degree is completed, and determining the stirring duration according to the proportion of the abnormal sub-regions during stirring. According to the invention, the mixing uniformity of gelatin and electrolyte can be improved.

The utility model discloses a structure for preventing internal leakage of horizontal single-stage centrifugal pump, related to centrifugal pump field, including pump body, guide vane, impeller and motor, be equipped with water inlet and water outlet on the pump body, and motor is connected through motor shaft and drives impeller, and guide vane cover is established in the impeller outside and is close to the water outlet place, and the impeller mouth part is close to the water inlet place and installs the mouth ring, and the mouth ring is supported on the guide vane, and forms the primary seal between the pump body and the guide vane, installs the sealing washer at the pump body and the guide vane sealing surface outside side stop mouth step, and the sealing washer is extruded by the pump body and the guide vane, forms the axial contact surface and radial contact surface, and the axial contact surface forms the axial seal with the guide vane, and the radial contact surface forms the radial seal with the pump body. The utility model effectively solved the problem of the low efficiency caused by the internal leakage of the water pump due to the poor flatness of the pump body and the guide vane cooperation sealing surface, and under the condition of not destroying the hydraulic structure, increases secondary seal, reduces the volume loss, thereby improves the water pump efficiency.

The application discloses an axial sealing lubricating mechanism and a double-suction centrifugal pump containing the same, relates to the technical field of centrifugal pumps, and comprises a pipe body one and a pipe body two, the pipe body one is provided with openings in a circle, the openings are all provided with moving rings, the outer side of the openings is provided with static rings, the moving rings and the static rings abut against each other, the outer side of the pipe body one is provided with a sleeve ring, the outer side of the sleeve ring is provided with an annular groove, the outer side of the annular groove is provided with a plurality of groups of through openings in a circle, movable blocks are arranged in the through openings, movable ports are formed in the movable blocks, rubber rings are formed in the plurality of groups of movable ports, the different material expansion coefficients of the moving rings and the static rings make the static rings have a slight axial displacement, the risk of lock caused by excessive expansion of materials under high temperature is avoided, fresh lubricating oil is directly delivered to a friction surface through an auxiliary mechanism, and wear debris is washed away.

This invention discloses a centrifugal pump control method and medium. When a centrifugal pump is used to transport fluid, the transport pipeline includes several centrifugal pumps. The method includes: a dynamic extraction step: extracting feature parameters based on the transport pipeline information and information of each centrifugal pump; and an optimized control step: obtaining the corresponding feature parameters within a control period, and controlling the transport flow rate of each centrifugal pump on the transport pipeline according to the feature parameters, thereby achieving centrifugal pump flow control through the corresponding transport flow rate values ​​of each centrifugal pump. This invention, by obtaining feature parameters from the transport pipeline and information of each centrifugal pump on the pipeline, and controlling the flow rate of each centrifugal pump based on these feature parameters, avoids overload or underload of the centrifugal pumps, ensures that the transport flow rate of the transport pipeline matches the actual production conditions and the operating status of the centrifugal pumps, and improves the operating efficiency of the transport pipeline.

The utility model discloses a casting machining table with a clamping function, which belongs to the technical field of impeller casting machining and comprises at least two clamps, the two clamps jointly clamp a hub of a centrifugal pump impeller, accommodating spaces are arranged in the clamps, clamping pieces are rotatably connected in the accommodating spaces, adjusting grooves are formed in the clamping pieces, the adjusting grooves are provided with inclined planes, and the inclined planes are arranged on the clamping pieces. An adjusting plate is vertically arranged in the containing space in a sliding mode and is in lap joint with the inclined face. Compared with the prior art, the casting machining table with the clamping function has the advantages that the step of replacing a clamp is omitted, the time consumed for clamping and positioning the centrifugal pump impeller is shortened, and then the efficiency of subsequent grinding and machining of the centrifugal pump impeller is improved.

The application discloses a centrifugal pump impeller design method, which comprises the following steps: initial parameter determination; parameterized geometric modeling, wherein the profile lines of the front cover plate and the rear cover plate of the impeller are constructed based on a cubic spline curve, and a blade surface model is generated by controlling point coordinates, a curvature radius and an inlet and outlet angle parameter; manufacturing process coupling design, wherein three-dimensional modeling software is used for parameterized modeling of the impeller, and a cutter kinematics equation of a five-axis machine tool is synchronously introduced; CFD numerical simulation analysis; construction of an artificial neural network; and compound shape reverse optimization. The application solves a three-dimensional RANS equation in a rotating column coordinate system to perform CFD verification, and combines the design strategy of the artificial neural network and the compound shape optimization algorithm to quickly and optimally select an optimal impeller model. The design of the impeller is based on the cubic spline curve to construct an impeller geometric model, and the generative machining technology of the five-axis numerical control machine tool is combined to realize deep cooperation of hydraulic design, three-dimensional modeling and manufacturing process.

The utility model discloses a centrifugal pump convenient to disassemble, and relates to the technical field of centrifugal pumps, the centrifugal pump comprises a base, a pump body, two connecting seat sets, two disassembling and assembling assemblies and a plurality of damping assemblies, the pump body is detachably connected to the base; each dismounting and mounting assembly is mounted on the base and is arranged on one side, far away from the base, of each connecting seat group, so that the two connecting seat groups are locked or loosened on the base; the multiple damping assemblies are arranged on the side, away from the pump body, of the base at intervals. According to the technical scheme, the pump body is detachably installed on the base through the two dismounting and mounting assemblies, dismounting and mounting are easy and convenient, the situation that the pump body of the centrifugal pump is difficult to take down due to the fact that screws and the like are rusted in the humid environment is avoided, dismounting and mounting of the pump body are more convenient, and the damping assemblies are arranged on the base, so that the service life of the pump body is prolonged. Therefore, vibration generated when the pump body works is reduced.

The invention discloses a hot water circulating pump with couplings, and relates to the field of centrifugal pumps, the hot water circulating pump comprises a base, the top surface of the base is fixedly connected with a base plate, a protective cover, a first support and a pump body, and the end face of the pump body is provided with a machine seal gland. Therefore, maintenance cost is reduced, potential safety hazards are reduced, the coaxiality calibration process is simplified, repeated measurement and adjustment of the position of the motor are not needed, time and labor are saved, coaxiality can be guaranteed, overload protection can be achieved, overload burning of the motor can be avoided, safety accidents are reduced, the operation safety of the whole hot water circulation system is improved, and the service life of the hot water circulation system is prolonged. And overload protection can be adaptively changed according to the size of the motor, so that coaxiality calibration and overload protection adjustment are synchronously carried out, secondary measurement and adjustment are not needed, and the automation degree of the device is improved while time and labor are saved.

The invention discloses a method and system for measuring the efficiency of an agricultural irrigation electric centrifugal pump, and relates to the technical field of agricultural centrifugal pump energy-saving operation management.The method comprises the steps that a first function relation and a second function relation matched with a to-be-measured centrifugal pump are obtained from a database; the first function relational expression is used for describing a mapping relation between the pump lift and the pump shaft power; the second function relational expression is used for describing a mapping relation between the pump lift and the pump efficiency; the actual pump lift of the centrifugal pump to be measured during operation is substituted into the first function relation and the second function relation, and a corresponding pump shaft power reference value and a corresponding pump efficiency reference value are obtained through calculation; and based on the pump shaft power reference value, the pump efficiency reference value and the actual pump shaft power of the to-be-tested centrifugal pump during operation, the actual pump efficiency of the to-be-tested centrifugal pump is obtained through calculation. According to the method, the actual pump efficiency can be calculated without a pump flow monitoring device, and the problem that the pump efficiency cannot be monitored due to high cost of small and medium-sized agricultural irrigation users is solved.

The chemical pump is of a semi-open type centrifugal pump structure and is composed of a plurality of blades and a disc, the blades are evenly arranged in the circumferential direction and fixed to the disc, the tail edges of the blades extend to the outer side of the disc, and cutting blades are arranged at the ends of the tail edges of the blades and fixed through positioning pins; each group of cutting blades consists of two blades which are parallel to each other up and down; and two cylinders are arranged between the two blades in each group. According to the method, the previous design mode of passive defense of microscopic aggregation is changed, and the design thought that latex microscopic aggregation is actively sheared to be dispersed in time so as to maintain dynamic stability of the latex microscopic aggregation is adopted; a streamline double-layer cutting blade and a double-cylinder structure are integrated, the synergistic effect of large-scale shearing and small-scale vortex street mixing is achieved, and the problem of uneven dispersion of viscous multiphase media is effectively solved.

The utility model provides a guide vane type water pump adopting a double-output-shaft motor, and belongs to the technical field of water pump instruments. The problem that the axial force load of an existing motor shaft is large is solved. The guide vane type water pump adopting the double-output-shaft motor comprises a centrifugal pump body and the motor, a sealing cavity used for containing the motor is formed in the centrifugal pump body, the motor is provided with a first output shaft and a second output shaft, and the first output shaft and the second output shaft are opposite in direction. The centrifugal pump body is provided with a water inlet, a water outlet, a first impeller set and a second impeller set, the first impeller set is arranged on the first output shaft, the second impeller set is arranged on the second output shaft, the first impeller set is used for guiding liquid at the water inlet to the second impeller set, and the second impeller set is used for guiding the liquid from the first impeller set to the water outlet. The utility model has the advantage of solving the axial force problem of the output shaft of the water pump motor.

The utility model belongs to the technical field of water supply, and particularly relates to a remote control vacuum pump exhaust device and system, which comprises a vacuum pump, a vacuum pump control box, a main exhaust pipeline and an electromagnetic valve, the electromagnetic valve is arranged on a main exhaust pipeline, the control end of the electromagnetic valve is connected with the vacuum pump control box, a starting button and a stopping button are arranged on the vacuum pump control box and used for inputting a starting signal and a stopping signal of the vacuum pump, and the output end of the vacuum pump control box is connected with the control end of the electromagnetic valve. Remote starting and stopping of the vacuum pump exhaust device can be achieved, and the starting efficiency of the centrifugal pump is greatly improved.

The application discloses a zirconium alloy mouth ring device for a centrifugal pump and an assembling method, and relates to the field of centrifugal pumps. The zirconium alloy mouth ring device for the centrifugal pump comprises a first mouth ring and a second mouth ring. The outer wall of the first mouth ring is matched with a mounting hole of a pump body or a pump cover, and the outer wall is sequentially provided with a first interference fit part and a first transition fit part in the axial direction; the inner hole surface of the second mouth ring is matched with a mounting shaft journal of an impeller, and the inner hole surface is sequentially provided with a second interference fit part and a second transition fit part in the axial direction. The ratio of the axial length of the first interference fit part to the first transition fit part and the ratio of the axial length of the second interference fit part to the second transition fit part are both 1:1.5 to 1:2.5. The application corrects the deformation of the mouth ring through interference fit and absorbs the assembling error through transition fit, solves the assembling precision control problem caused by the fact that the zirconium alloy mouth ring cannot be precisely machined after heat treatment, and ensures the uniformity and stability of the running gap of the mouth ring.

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 application discloses a kind of k near neighbour centrifugal pump fault diagnosis methods based on improved ReliefF weighting provided by the patent, the vibration signal of centrifugal pump under different operating conditions is collected and is sliced after it, then the characteristic parameters in time domain and frequency domain are calculated, and the feature selection is carried out using extreme forest model, the weight of characteristic parameter is calculated using improved ReliefF algorithm, and then the fault type of the sample to be measured is predicted using k near neighbour algorithm weighted by Gaussian distance.The k near neighbour centrifugal pump fault diagnosis method based on improved ReliefF weighting proposed in the application can well realize the various fault diagnosis and classification of centrifugal pump and the system composed of it, improve the operation efficiency of algorithm, and ensure the reliability and stability of diagnostic result.