2471 results about "Centrifugal pump" patented technology

The invention relates to the technical field of industrial equipment health monitoring and fault diagnosis, and discloses a centrifugal pump intelligent detection method and system based on multi-source data. The centrifugal pump intelligent detection method based on the multi-source data comprises the steps that centrifugal pump multi-source heterogeneous data are collected and preprocessed; extracting multi-scale features and constructing an optimal feature subset through hierarchical feature selection; constructing a multi-level dynamic Bayesian network to establish a probabilistic reasoning framework; calculating a feature credibility weight based on the signal quality, the feature stability and the diagnosis correlation; executing multi-source evidence fusion and Bayesian state reasoning; confidence self-calibration and parameter self-adaptive adjustment are realized through historical diagnosis result feedback; the method can effectively cope with the complex and changeable environment of an industrial site, can still keep stable diagnosis performance under the condition that the sensor part loses efficacy or the data quality is uneven, improves the accuracy and reliability of fault diagnosis, and provides powerful technical support for predictive maintenance of industrial equipment.

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 discloses a centrifugal pump rotor curved surface profile tolerance detection device and method, and relates to the technical field of curved surface profile tolerance detection. The device comprises a base, four conveying belt wheel supports are fixedly installed on the base, two conveying belt wheels arranged in parallel are rotationally installed on the four conveying belt wheel supports, the two conveying belt wheels are in transmission connection through two conveying belts arranged in parallel, and a gap is formed between the two conveying belts; a supporting sliding plate is arranged in the middle of the conveying belt, and the upper surface of the supporting sliding plate is in sliding fit with the conveying belt for supporting the conveying belt; an arch-shaped frame is further fixedly installed on the base, a top clamping electric cylinder and a bottom clamping electric cylinder which are symmetrically arranged are rotationally installed on the arch-shaped frame, and an external expansion extrusion clamping head and an extrusion conical head are fixedly installed at the end of a telescopic rod of the top clamping electric cylinder and the end of a telescopic rod of the bottom clamping electric cylinder correspondingly in a convenient-to-disassemble mode; a three-dimensional laser measuring and scanning assembly used for detecting the curved surface contour of the centrifugal pump rotor is further movably installed on the arch-shaped frame.

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.

A centrifugal pump shutdown sealing device based on axial thrust comprises a pump cover (1) and an annular plate (11), an inner cylinder (3) and an outer cylinder (5) are connected between the pump cover and the annular plate in a sealed mode, an inner corrugated pipe (4) and an outer corrugated pipe (8) are welded between the sections of the inner cylinder and between the sections of the outer cylinder respectively, a water injection port (6) is formed in the outer cylinder, and a guide rod (7) penetrates through the annular plate and is fixedly connected to the pump cover. The right end of the guide rod is sleeved with a spring (10) and screwed with an adjusting nut (11), the left side of the annular plate is connected with a rubber annular plate (13), a shaft sleeve (14) is fixed to the pump shaft, and the rubber annular plate can be attached to the right end face of the shaft sleeve. The sealing device has the advantages that all the components are installed on the pump cover, the load of the pump shaft is reduced, unbalanced force cannot be generated on the pump shaft, the sealing device is not prone to being damaged when the machine stops, and no adverse effect is generated on the pump shaft. When the centrifugal pump works, the rubber ring plate on the ring plate is separated from the shaft sleeve, and when the centrifugal pump stops, the rubber ring plate is tightly attached to the shaft sleeve.

The invention relates to the field of centrifugal pumps, and particularly discloses a sealed centrifugal pump with a self-cooling function, which comprises a pump shell, an impeller, a pump shaft, a motor, a liquid inlet pipe and a liquid outlet pipe, a closed heat exchange pipe is arranged on the motor, and a negative pressure block is arranged at one end, far away from the liquid inlet pipe, of the pump shaft; a heat exchange box is arranged in the pump shell and located at the end, away from the liquid inlet pipe, of the impeller, the heat exchange pipe extends into the heat exchange box, a circulation hole for liquid to flow in is formed in the heat exchange box, the heat exchange box further communicates with a liquid drainage branch pipe, the liquid drainage branch pipe communicates with the liquid outlet pipe, the liquid inlet pipe communicates with a liquid supply branch pipe, and the liquid supply branch pipe extends into the pump shell and right faces the negative pressure block. A driving assembly used for driving cooling liquid in the heat exchange pipe to flow through liquid on the back face of the impeller is arranged in the pump shell. The motor cooling device has the advantages that the cooling efficiency is high, cooling liquid in the heat exchange pipes is pure, and the motor sealing performance is high.

The invention relates to the technical field of self-sucking pumps, in particular to an efficient vacuum energy-saving self-sucking pump which comprises a base, a first pump cavity, a motor, a rain baffle, a first impeller, a compensation assembly and a drainage assembly, the first pump cavity, the motor and the rain baffle are sequentially installed at the upper end of the base, and the first impeller is installed at the axis position in the first pump cavity; the drainage assembly is installed at the lower end of the first impeller, and the two compensation assemblies are installed in the drainage assembly. After the drainage assembly is started, the drainage assembly is used for guiding the liquid level to overflow the first impeller and removing large-particle solids in fluid, and the compensation assembly drives the first impeller to move downwards to reduce the gap when detecting that the gap between the first impeller and the inner wall of the first pump cavity is enlarged. The tip end of the blade is easily and continuously washed by solid particles, so that the flow and lift of the core pump are reduced, and the efficiency is obviously reduced.

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 belongs to the technical field of centrifugal pump production, particularly relates to an intelligent welding system and method for multi-stage centrifugal pump impeller machining, and aims at a combined impeller composed of a lower cover plate, an upper cover plate, a blade component, an upper pressing plate component, a lower pressing plate component and a locknut. The positioning rotary disc assembly is used for positioning the lower pressing plate component and the lower cover plate and driving the lower pressing plate component and the lower cover plate to rotate, the blade feeding assembly is used for installing the blade components on the lower cover plate one by one, the feeding mechanical arm is used for installing the upper cover plate above the blade components, and the rotating direction of blade parts in the blade components can be adjusted. After adjustment, the position of the lower cover plate is locked through the upper pressing plate component, a locknut is installed on the outer side of a screw rod, extending out of the lower pressing plate component, in the upper pressing plate component through a screw turning machine, and finally welding treatment is conducted on a welding inner seam / welding outer seam at the butt joint position of the lower cover plate and the upper cover plate through the inner seam welding assembly / outer seam welding assembly. And the rapid assembly requirement of the combined impeller is met, and the welding efficiency is high.

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 dispersing equipment. The dispersing equipment comprises a dispersing part and a driving part, the dispersing component comprises a rotating shaft, a dispersing machine and a centrifugal pump. The dispersion machine comprises a dispersion main body and a screen cylinder. And the dispersing main body is provided with a dispersing cavity for accommodating the screen barrel. The centrifugal pump comprises a pump shell and an impeller. The rotating shaft is sequentially and fixedly connected to the screen barrel and the impeller. The pump shell is provided with a pump cavity, a feeding port and a discharging port. The impeller is arranged in the pump cavity. The discharge hole is formed in the end part, far away from the dispersion machine, of the pump shell. The pump shell is provided with a side flow channel. And a discharge port is formed in the discharge end of the side runner. And the feeding end of the side runner and the feeding hole are oppositely arranged in the axial direction of the rotating shaft. And the feed port, the pump cavity, the side runner, the discharge port and the dispersion cavity are sequentially communicated and form a slurry runner. And the driving part is fixedly connected with the rotating shaft and is used for driving the rotating shaft to drive the screen barrel and the impeller to rotate, so that the control difficulty of the material retention time and the shearing strength is reduced, the consistency of material characteristics is improved, and the material dispersion quality is improved.

The invention discloses a design method and application of a multi-stage centrifugal pump transition runner splitter plate. Relates to the design improvement of the transition runner splitter plate structure of the multi-stage middle-open centrifugal pump. By improving the structure of the transition flow channel, the hydraulic loss in the transition flow channel is reduced, the working efficiency is improved, and the purpose of saving energy is achieved. The method comprises the following steps that S1, a mathematical model of the deviation angle of the transition flow channel splitter plate is established, S2, numerical simulation verification of the multi-stage centrifugal pump is conducted according to the mathematical model, and S3, a target model is found according to the numerical simulation verification result. According to the design method, the hydraulic characteristics of the multi-stage centrifugal pump in actual operation are analyzed, the arrangement rule of the longitudinal splitter plates is creatively revealed, and a better solution of a target model is obtained on the basis of a nonlinear rule. According to the method, r / R and alpha serve as interactive variables, and the comprehensive influence of r / R and alpha on lift and efficiency is researched through numerical simulation. The limitation of a single parameter in a traditional design is broken through, and a new thought and technical means are provided for improving the performance of the multi-stage pump.

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.

According to the centrifugal pump with the double-spiral blades and the double-roller type granulator using the centrifugal pump, the double-spiral blades are adopted, and the first blade and the second blade influence and balance each other; the contour line of the working surface of the first blade is an Archimedes spiral, and the contour line of the back surface of the second blade is a logarithmic spiral; the contour line of the back face of the first blade comprises a part of a first equal-pitch spiral line close to the inlet side and a part of a first variable-pitch spiral line away from the inlet side, and the contour line of the working face of the second blade comprises a part of a second variable-pitch spiral line close to the inlet side and a part of a second equal-pitch spiral line away from the inlet side. According to the spiral vane pump, the instability of fluid in the spiral vane pump can be optimized, vibration and noise are reduced, the second vane is equivalent to supplement of the first vane, cavitation and cavitation are effectively reduced, and the hydraulic efficiency and the stable performance of the centrifugal pump are improved to a certain degree.

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 belongs to the technical field of mechanical equipment fault detection and diagnosis, and particularly relates to a centrifugal pump multi-sensor data fusion cavitation monitoring and early warning system. The data acquisition unit comprises an acoustic emission sensor, a vibration sensor, a pressure sensor, a power monitoring sensor and a noise sensor and is used for monitoring different characteristics of a cavitation phenomenon; the signal preprocessing unit is used for preprocessing signals acquired by various sensors; the data fusion unit is used for recognizing typical characteristics of cavitation by combining a fluid mechanics model, a power consumption model and signals acquired by the sensor in real time; multi-sensor signal fusion and sound field, vibration field and fluid dynamic field coupling analysis are adopted; the two-way data analysis and operation state feedback unit comprises a real-time feedback mechanism and a reverse feedback mechanism, operation parameters are dynamically adjusted by monitoring operation data of the pump in real time, and the working state of the pump is optimized. According to the invention, the accuracy and real-time performance of cavitation monitoring are effectively improved.

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 present invention relates to the technical field of tar residue separation, and in particular to an online crushing, slag collection and separation system and process for large tar residue based on a pre-separator, wherein the online crushing, slag collection and separation system for large tar residue based on a pre-separator includes a pre-separator and a pre-separation pipe A and a pre-separation pipe B connected to the outlet end of the pre-separator, a crushing device respectively connected to the outlet ends of the pre-separation pipe A and the pre-separation pipe B, a centrifugal pump and a pretreatment device connected to the outlet end of the centrifugal pump, the crushing device is used to crush tar residue and graphite blocks, and the pretreatment device is used to precipitate and layer the crushed tar, tar residue, graphite blocks and ammonia water mixture; the present invention realizes the crushing, slag collection and drying of large tar residue and graphite blocks through a two-stage crushing treatment method composed of a crushing device and a drying unit, significantly reduces the risk of blockage in subsequent processes, meets the requirements of the coal blending process for material particle size, and improves the availability of tar residue.

The utility model belongs to the technical field of PEM water electrolysis hydrogen production, and particularly relates to a water circulation system for PEM water electrolysis hydrogen production. The water inlet end of the pretreatment system is connected with the water outlet end of the raw water tank through a direct-current pump; the water inlet end of the secondary treatment equipment is connected with the water outlet end of the pretreatment system through an electromagnetic valve; the water inlet end of the pressure barrel is connected with the water outlet end of the secondary treatment equipment through a booster pump; the water inlet end of the purification column is connected with the water outlet end of the pressure barrel through an electromagnetic valve; the water inlet end of the pure water tank is connected with the water outlet end of the purification column through an electromagnetic valve; the water inlet end of the heat exchanger is connected with the water outlet end of the pure water tank through a centrifugal pump. According to the PEM water electrolysis hydrogen production system, the circulating water paths of the water purification machine and the hydrogen production equipment are integrated and mixed, so that the PEM water electrolysis hydrogen production system can directly use municipal water as a raw material, the pipeline between the PEM water electrolysis hydrogen production system and the water purification machine is optimized and integrated, and waste water can also be discharged into the pure water tank for recycling.

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 belongs to the technical field of polishing, and particularly relates to a centrifugal pump impeller combined type rotary polishing device which comprises a polishing chamber, a lifting tray is arranged in the middle of the interior of the polishing chamber, an impeller body is placed on the lifting tray, a first motor is installed at the top of the polishing chamber, and a connecting shaft is fixed to an output shaft of the first motor. A pressing sleeve is vertically and slidably arranged below the connecting shaft, a first liquid spraying pipe is installed at the position, located above the impeller body, of one end of the polishing chamber, a second liquid spraying pipe is arranged on the side, away from the first liquid spraying pipe, of the lower portion of the polishing chamber, and the bottom end of the polishing chamber communicates with a liquid outlet pipe. The impeller main body vertically reciprocates under the action of the lifting tray while rotating, so that the friction contact effect and efficiency between abrasive particles and the impeller main body are improved, the polishing operation efficiency is improved, and the industrial treatment time is saved.

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.