1965 results about "Centrifugal pump" patented technology

The invention belongs to the technical field of multi-stage centrifugal pump production, and particularly relates to an automatic production line for assembling a pump cover of a multi-stage centrifugal pump, which mainly comprises a lifting type turnover assembly, a first extrusion assembly, a second extrusion assembly, a strake pushing manipulator and an inner supporting piece feeding assembly, for a reinforced pump cover composed of a pump cover piece, an inner supporting piece and an outer hoop piece, a pump cover blank is adsorbed through a lifting type overturning assembly and is driven to overturn around the axis of the pump cover blank, and a first extrusion assembly and a second extrusion assembly are jointly used for sequentially extruding, forming and machining the pump cover blank into a pump cover semi-finished product and the pump cover piece; the second extrusion assembly is matched with the strake pushing mechanical arm to additionally install multiple circles of outer strake pieces on the outer side of the pump cover piece, the inner supporting piece feeding assembly is used for additionally installing an inner supporting piece on the inner side of the pump cover piece which moves to the second station, in this way, automatic assembling of the reinforced pump cover can be achieved, the reinforced pump cover keeps the advantage of light weight, and meanwhile the assembling efficiency is improved. The compressive strength and the overall rigidity are qualitatively improved.

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 curve determination method for a centrifugal pump point-by-point integration method, and belongs to the technical field of centrifugal pumps. The curve determination method of the centrifugal pump point-by-point integration method is a parameterized modeling method based on an Euler equation and momentum conservation, the inlet and outlet boundaries of a vur curve are calculated according to design requirements, after a smooth transition curve is constructed in combination with runner geometry and attack angle constraint, the curve is constructed through nonlinear interpolation according to the dynamic correlation streamline arc length, and the curve is determined. The relation between the streamline arc length and the curve is established; according to the method, when the centrifugal pump blade molded line is designed, the curve can be quickly obtained through a parameterization method according to the given design condition and the streamline arc length s.

The invention relates to the technical field of multi-stage centrifugal pumps, and discloses an axial balance assembly which comprises a balance shaft sleeve, a pump shaft and a high-pressure throttling ring connected to a water inlet and outlet section, the balance shaft sleeve is connected to the pump shaft and arranged on the periphery of the pump shaft in a sleeving mode, and the high-pressure throttling ring is arranged on the periphery of the balance shaft sleeve in a sleeving mode. The high-pressure throttling ring and the periphery of the balance shaft sleeve are limited to form a flow blocking cavity, the flow blocking cavity is provided with a high-pressure flow blocking inlet and a high-pressure flow blocking outlet, the high-pressure flow blocking inlet and the high-pressure flow blocking outlet are oppositely arranged at the two ends of the flow blocking cavity in the axial direction of the balance shaft sleeve, and the high-pressure throttling ring is provided with a high-pressure ring end face. The balance shaft sleeve is provided with a high-pressure shaft end face, and the high-pressure choke flow inlet is located between the high-pressure ring end face and the high-pressure shaft end face. According to the axial balance assembly, generation of residual axial force from the high-pressure section to the low-pressure section is reduced, the service life of the water pump is prolonged, and the operation reliability of the water pump is improved.

The invention provides a gas-liquid-solid multi-phase conveying centrifugal pump performance prediction method and an optimization design method. According to the method, the performance of the centrifugal pump is accurately predicted and the design efficiency of the centrifugal pump is improved through numerical simulation and optimization design in combination with a gas-liquid-solid three-phase flow dynamic model. Firstly, blade parameters are determined according to design requirements, a three-dimensional model is established, and grid division is carried out; then, the VOF-Level Set multiphase flow model, the particle model and the gas-liquid-solid coupling model are corrected, factors such as surface tension, particle immersion force and drag force are considered, and lift and efficiency curves are calculated through numerical simulation; and finally, a particle accumulation area is analyzed based on the particle distribution characteristic graph, and the optimal lift efficiency combination is obtained by adjusting parameters such as the inlet angle, the inlet width, the wrap angle and the blade number of the blades and optimizing design. According to the method, the performance of the centrifugal pump in the gas-liquid-solid multiphase flow environment can be improved, and a new design thought is provided.

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 a device for simulating influence of ditch cleaning ice cover evolution on hydrodynamic parameters and an application method thereof, and relates to the technical field of ice water dynamics and hydraulic engineering experiments. The device comprises a low-level water tank, a high-level water tank, a centrifugal pump, a flow valve, a water tank, a steady-flow perforated plate, a ditch cleaning ice cover simulation device, a first water level control grid plate, a second water level control grid plate and a flow field measurement system. According to the invention, three key parameters of ditch cleaning length, ice cover submerging water depth and roughness of the bottom of the ice cover are independently regulated and controlled, and non-contact high-precision measurement is carried out by means of a PIV technology, so that systematic and refined research on hydrodynamic parameters of an ice cover ditch cleaning area is realized. According to the method, researchers can safely and systematically research the influence of a single variable on the ice cover ditch cleaning water power at low cost, and the fundamental bottleneck of traditional field measurement in the research is solved.

The invention relates to the technical field of fluid machinery control, and discloses an intelligent vibration reduction control method and system for a centrifugal pump, and the method comprises the following steps: obtaining vibration signal data to obtain frequency spectrum characteristics; when the spectrum feature exceeds a threshold value, abrupt change parameters are extracted, pipeline system coupling data are fused, and a multi-pump cooperation state vector is generated; generating a distributed decision instruction sequence according to the state vector classification; fusing the feedback information according to the instruction sequence to obtain an initial adaptive strategy parameter; the operation parameters are adjusted according to the initial parameters, the efficiency is calculated, loop iteration optimization is carried out until the efficiency reaches the standard, and final self-adaptive strategy parameters are obtained; and the stability is verified after the final parameters are deployed, and loop optimization is returned if the verification fails. Through multi-pump cooperation and double closed-loop optimization, the stability, efficiency and reliability of cooperative operation of the pump set can be 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 relates to the technical field of centrifugal pump fault diagnosis, and discloses a centrifugal pump performance intelligent diagnosis method and system based on pressure characteristics, and the centrifugal pump performance intelligent diagnosis method based on the pressure characteristics comprises the steps: constructing a flow-machine double-domain theoretical framework, and building a system state evolution equation; structural features are extracted from the centrifugal pump pressure gradient field through a topological data analysis method, and a flow field abnormal mode is recognized; based on the time domain, frequency domain and time-frequency domain characteristics of the centrifugal pump pressure signal, a pressure fingerprint model is constructed, and mechanical fault characteristics are extracted; establishing a causal relationship network between the flow field anomaly and the mechanical fault by using a graph causal inference technology; fusing physical model constraint and data-driven learning, and constructing a knowledge graph hybrid inference engine; constructing an interpretable AI decision system; according to the invention, through the flow and machine fault causal network model, accurate source tracing from symptom expression to root causes is realized, and targeted maintenance decisions are effectively supported.

The invention relates to a biological membrane sewage treatment method and device based on aeration on-off time intelligent regulation and control. The method comprises the following steps: sewage pretreatment: adding a flocculating agent into sewage of a flocculation device, stirring by stages, standing and precipitating, settling and separating floc, and enabling supernatant obtained by separation to enter a membrane bioreactor through a first water outlet device; aeration treatment: adopting an intermittent aeration mode to carry out cycle aeration on the supernatant conveyed by the first water outlet device; membrane separation treatment: pumping the sewage subjected to aeration treatment into a second water outlet device from the membrane bioreactor under the negative pressure pumping action of a centrifugal pump so as to realize the separation of the sewage and pollutants, and regulating and controlling the aeration on-off time according to the composition characteristics of microbial communities in the process of performing aeration treatment in an intermittent aeration mode so as to realize the aeration treatment. The invention relates to a method for optimizing the relative abundance of part of phylum and reducing the accumulation of extracellular polymeric substances and soluble microbial products. The device comprises a flocculation device, a membrane bioreactor and a control unit.

The utility model provides a double-mechanical-seal pipeline centrifugal pump, which belongs to the technical field of centrifugal pumps and comprises a pump body, a pump cover, a pump shaft, an impeller, a motor, a siphon tank, a siphon and a liquid return pipe. An oil cavity is formed in the pump cover, a first through hole and a second through hole are oppositely formed in the side wall of the oil cavity, and the middle of the pump shaft penetrates through the first through hole, the oil cavity and the second through hole. A mechanical seal is arranged between the pump shaft and the first through hole, and a sealing assembly is arranged between the pump shaft and the second through hole. The oil cavity and the siphon tank are filled with lubricating oil, the siphon tank is communicated with the oil cavity through a siphon, and the siphon tank is communicated with the oil cavity through a liquid return pipe. After absorbing operation heat, the lubricating oil automatically moves upwards, enters the siphon tank through the siphon tank and then returns to the oil cavity through the liquid return pipe; if the liquid leaks into the oil cavity, the leaked liquid can enter the siphon tank along with the lubricating oil. Whether the liquid leaks to the oil cavity or not can be fed back by observing the liquid in the siphon tank, intervention is conducted in time, and the transportation safety of dangerous liquid such as flammable media is improved.

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 invention relates to the technical field of multi-stage horizontal centrifugal pumps, and discloses a multi-stage horizontal centrifugal pump which comprises a driving motor, an output end of the driving motor is fixedly connected with one end of a pump shaft, the other end of the pump shaft is fixedly connected with a multi-stage centrifugal pump component, a positioning mechanism is further arranged on the pump shaft, and the positioning mechanism is rotationally connected with the pump shaft; the balance mechanism comprises a driven part and a hydraulic part, the driven part is located between the positioning mechanism and the driving motor, one end of the driven part is connected with the pump shaft in a matched mode, and the other end of the driven part is fixedly connected with the hydraulic part; the feedback mechanism comprises a thrust component, an amplifying component and a sealing component, the thrust component is located between the positioning mechanism and the multistage centrifugal pump component, the thrust component is connected with the amplifying component in a matched mode through the sealing component, the amplifying component is rotationally connected with the hydraulic component, and the thrust component communicates with the hydraulic component through a pipeline. According to the invention, the adaptability under various working conditions is improved, and the pump shaft movement phenomenon is reduced.

The invention relates to the technical field of oil and gas field and coal bed gas field mining equipment, in particular to a wellhead suspension centrifugal pump drive double-pipe jet flow drainage and mining device and a using method. According to the technical scheme, a lower tubing head four-way joint, a middle tubing head four-way joint and an upper tubing head four-way joint are sequentially installed on a bottom flange, a motor is installed on the upper portion of the upper tubing head four-way joint, and an inner pipe plug-in pump core catcher is installed at the lower end of a submersible water injection centrifugal pump; the lower end of the inner pipe inserted pump core catcher is movably connected with an inner layer oil pipe, and a pump core installed in the double-pipe jet pump is arranged in a pump cylinder of the jet pump. The device has the advantages that due to the fact that a packer is omitted and the device is connected with the double-pipe jet pump, sand-containing liquid in a well can be sucked, and exploitation of natural gas or coal bed gas can be achieved; the inner pipe is inserted into an elastic clamping jaw of the pump core catcher to catch the pump core; and the submersible water injection centrifugal pump and the pump core can be lifted to the ground at one time by hoisting the motor at a ground wellhead, so that the maintenance is convenient.

The invention relates to the technical field of centrifugal pump control, and discloses an intelligent control multi-working-condition ultrahigh-lift single-stage centrifugal pump control method which comprises the steps that attention-guided dimension reduction fusion and multi-scale feature extraction are conducted on multi-source working condition data, and multi-scale operation features are obtained; time evolution and clustering processing are conducted on the multi-scale operation characteristics through a time clustering algorithm based on density, and the current working condition of the ultrahigh-lift single-stage centrifugal pump is obtained; and taking the current working condition, the performance parameters and the performance score of the ultrahigh-lift single-stage centrifugal pump as state vectors, and selecting an optimal control vector from a control space by adopting a reinforcement learning model. By fusing multi-source data and introducing time evolution modeling and reinforcement learning optimization strategies, intelligent sensing and self-adaptive control of the ultra-high-lift single-stage centrifugal pump under multiple working conditions and the whole life cycle are achieved, the problems that response to complex operation states is slow and adjustment lags in traditional rule driving control are solved, and the service life of the ultra-high-lift single-stage centrifugal pump is prolonged. The energy efficiency ratio, the operation stability and the equipment service life are improved.

The invention relates to the technical field of pumps, and discloses a reliable double-shell self-balancing multi-stage centrifugal pump, a low-pressure section is provided with a medium inlet and an inducer chamber, the two ends of the inducer chamber communicate with the medium inlet and a fluid cavity correspondingly, and an inducer connected to a pump shaft is arranged in the inducer chamber; the pump shaft sleeve is provided with a throttling ring, the throttling ring is located at the end, away from the low-pressure section, of the high-pressure section, drainage threads are arranged on the periphery of the throttling ring, a throttling channel is defined between the drainage threads and the high-pressure section, the mechanical seal base is provided with a pressure relief channel, one end of the throttling channel is communicated with the fluid cavity, and the other end of the throttling channel is communicated with the pressure relief channel. And the pressure relief channel is communicated with the inducer chamber through a pressure relief pipe. According to the reliable double-shell self-balancing multi-stage centrifugal pump, the throttling ring is driven by the pump shaft to rotate, the inlet pressure is effectively increased, cavitation is prevented, the throttling channel has the pressure relief effect on the high-pressure section, the impact load of a high-pressure medium on the pump shaft, the bearing and the bearing box is relieved, the operation stability of the pump is improved, and the service life of the pump is prolonged.

Systems and methods are disclosed herein for simultaneously milling an obstructions and collecting the resulting debris within a wellbore in an oil-and-gas setting. An example debris collection tool can include a motor, centrifugal pump, gear boxes, bailers, and a pass-through milling bit. A series of shafts can pass through the internal components of the tool and cause various components to rotate when driven by the motor. The gear boxes can lower the speed and increase the torque of rotating downhole components. The tool therefore can simultaneously drive the pump and milling bit at different speeds and torques. The centrifugal pump can include a flow control mechanism at allows the tool to control the flow of drilling fluid from the centrifugal pump into the surrounding subsurface.

The invention provides a centrifugal pump performance evaluation method and system based on cloud computing, relates to the technical field of centrifugal pump performance evaluation, and can dynamically reflect the influence of slurry characteristic change on pump performance by introducing and analyzing the fluid resistance influence quantity. Therefore, the temporary performance fluctuation caused by the viscosity change of the slurry is prevented from being misjudged as the abrasion of the pump body. Meanwhile, when the pump body is actually and slowly worn, even if the slurry characteristic temporarily covers the performance reduction, the real physical damage can be recognized in time according to the low fluctuation state of the fluid resistance influence quantity and the continuous exceeding of the performance deviation in the preset range, and the potential fault risk is avoided. Therefore, the accuracy and the reliability of performance evaluation of the centrifugal pump are remarkably improved, a more scientific and refined basis is provided for maintenance decision-making of the centrifugal pump in chemical production, the operation cost is effectively reduced, and the continuity and the safety of production are guaranteed.

The invention relates to the technical field of oilfield water injection, and discloses a water injection skid process system with self-adaptive switching and redundancy functions and a control method. The water injection skid process system comprises a main process unit which is formed by connecting a main centrifugal pump and a main plunger pump in series; the self-adaptive switching unit comprises a standby pump set branch, a bypass branch and a control module; and the redundancy design unit is used for carrying out double-valve parallel redundancy configuration on the key valves and carrying out double-path redundancy setting on the key sensors. According to the invention, a three-layer structure with a main process, self-adaptive switching and redundancy design is systematically constructed, and a hardware foundation of a high-reliability water injection system is laid. The structure not only realizes a conventional water injection function, but also remarkably reduces the risk of single-point failure by introducing redundancy and a self-adaptive mechanism, so that the system can keep continuous operation when equipment fails or working conditions are abnormal, the stability and production efficiency of oilfield water injection operation are greatly improved, and the economic benefit is increased. The problems of poor single-point fault resistance and lack of working condition self-adaption are solved.

The utility model discloses a long shaft submerged magnetic drive centrifugal pump which comprises a motor, a rotating shaft, an impeller, a shell and a water outlet pipe, the motor drives the rotating shaft to rotate, the rotating shaft is rotatably connected with the shell, the impeller is installed at the lower end of the rotating shaft, the shell comprises a fixed shell and an impeller shell, a cavity is formed in the fixed shell and the impeller shell, the impeller is located in the cavity, and the fixed shell is provided with a groove. At least part of the impeller is located in the groove, a cavity channel is formed between the impeller and the groove, the impeller shell comprises an outlet, the outlet is connected with a water outlet pipe, the water outlet pipe is provided with a branch pipe, the branch pipe is connected with a plurality of flow dividing pipes, the fixed shell is provided with a plurality of channels, the flow dividing pipes are connected with the channels, and the flow dividing pipes are communicated with the cavity channel. Solid particles between the fixed shell and the impeller are discharged out of the cavity channel through media flowing into the branch pipes, and the solid particles are prevented from being accumulated in the cavity channel to abrade the impeller and the fixed shell.

The invention belongs to the technical field of centrifugal pump fault diagnosis, and discloses a centrifugal pump fault diagnosis method based on deep learning, which comprises the following steps: deploying a sensor, and collecting and storing data of a centrifugal pump during operation; performing Kalman filtering processing on the data; carrying out time domain and frequency domain feature extraction on the data by adopting empirical mode decomposition; a Boruta-SHAP algorithm is adopted to screen and fuse the features; the method comprises the following steps: optimizing and updating hyper-parameters of an SDAE deep learning fault diagnosis model by utilizing existing historical fault data and fault label data of a centrifugal pump in combination with an improved frost ice optimization algorithm to obtain an optimized deep learning fault diagnosis model; and S4, identifying the feature combination fused in the step S4 by using the optimized deep learning fault diagnosis model, and obtaining and outputting a final diagnosis result. According to the method, human subjective interference during feature selection is avoided, so that the diagnosis result is more accurate.

The invention relates to the technical field of centrifugal pump control, and provides an energy-saving centrifugal pump control method and system.The method comprises the steps that a centrifugal pump is started, operation data are collected, and according to the operation data and a preset process target, the rotating speed of the centrifugal pump is adjusted, and operation of the centrifugal pump is maintained; on the basis of maintaining operation of the centrifugal pump, disturbance of preset amplitude is conducted on the rotating speed of the centrifugal pump according to a preset period, and motor input power change data and pump hydraulic power output change data caused by disturbance are collected; according to the motor input power change data and the pump hydraulic power output change data, the efficiency change trend corresponding to the current operation point is calculated; and the rotating speed of the centrifugal pump is adjusted according to the efficiency change trend, so that the energy consumption is reduced while the process requirements are met. The centrifugal pump has the effects of improving the working stability and prolonging the service life of the centrifugal pump.

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 relates to the technical field of centrifugal pump mechanical seal detection, in particular to a centrifugal pump mechanical seal air tightness pressure maintaining detection tool which comprises a base, a tool frame, a simulation mandrel and an air path system. By introducing a matching structure of the sliding core shaft and the conical sliding block, the conical sliding block is pushed by air pressure to axially move along the sliding core shaft, so that dynamic loading between the dynamic and static rings of the mechanical seal is realized. The design simulates the stress condition of the mechanical seal in an actual assembly state, and can effectively detect whether the grinding surfaces of the moving and static rings have tiny defects or not. Meanwhile, through the design of the multi-stage sealing area, it is ensured that gas in the testing cavity cannot leak, and therefore the accuracy of the testing result is improved. In addition, the tool is easy and convenient to operate, the airtightness test of the mechanical seal can be rapidly completed without professional training, the efficiency of finished product inspection is remarkably improved, and reliable guarantee is provided for the overall quality of the centrifugal pump.

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 discloses an anti-freezing device for a winter hydrological monitoring system in a severe cold area, and the anti-freezing device comprises water disturbance equipment which is provided with a water outlet located in water in a hydrological monitoring cylinder. And the water disturbance equipment continuously conveys water to water in the hydrological monitoring cylinder through the water outlet so as to disturb the water in the hydrological monitoring cylinder. According to the device, disturbance equipment, such as a submersible pump or a centrifugal pump, is integrated in a hydrological monitoring cylinder through an integrated frame; the disturbance equipment goes deep into a certain water level and then continuously disturbs a water body so as to achieve the anti-icing effect.

The invention discloses a robot and method for cleaning attachments on the surface of an underwater hull, the robot comprises a machine body, walking devices, a smashing device, a sweeping device and an adsorption steering device, and the walking devices are arranged on the two sides of the machine body and used for driving the robot to advance and retreat; the smashing device is arranged at the front end of the machine body and used for chopping attachments on the surface of the hull. The sweeping device is arranged at the bottom of the machine body and used for sweeping away attachments smashed by the smashing device. The adsorption steering device pumps water in a suction cup through a centrifugal pump, negative pressure is generated in the suction cup, the suction cup is adsorbed to the surface of a ship body, a lifting rod abuts against a gear box and jacks up a machine body, a steering motor drives the gear box and the machine body to rotate through a driving gear and a driven gear, and steering of the robot is achieved. The robot can adapt to different surfaces of the ship body and flexibly steer and move on the surface of the ship body, and attachments are efficiently removed.