3117 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 fault diagnosis method and device, electronic equipment and a storage medium, and the method comprises the steps: carrying out the feature extraction of a vibration signal of a to-be-diagnosed centrifugal pump, and obtaining a vibration feature; the vibration characteristics comprise time domain characteristics, frequency domain characteristics and time-frequency domain characteristics; inputting the vibration characteristics into a fault diagnosis model to obtain a fault diagnosis result output by the fault diagnosis model; wherein the fault diagnosis model is obtained through training based on sample vibration characteristics and fault labels corresponding to the sample vibration characteristics, the fault diagnosis model is obtained through construction based on a bidirectional long short-term memory network BiLSTM, and weight vectors in a forward propagation layer and a reverse propagation layer of the fault diagnosis model are decoupled into parameter vectors and parameter scalar quantities. According to the centrifugal pump fault diagnosis method and device, the electronic equipment and the storage medium, the prediction precision of the fault diagnosis model can be improved, and then the fault diagnosis result can be accurately obtained.

The invention belongs to the technical field of multi-stage centrifugal pump production, and particularly relates to an automatic punching system and method for a pump cover of a multi-stage centrifugal pump, all assemblies cooperate with one another, and a clamping assembly is used for clamping a pump cover body and driving the pump cover body to rotate in the horizontal circumferential direction and rotate around the axis of the pump cover body; an H-shaped groove is formed in the pump cover body in a punching mode along the cylindrical spiral line through a notching assembly; the inner spiral supporting body and the outer spiral supporting body are correspondingly conveyed to preset positions on the inner side and the outer side of the pump cover body through the supporting body feeding assembly; the locking assembly is used for bending the protruding pieces defined by the H-shaped grooves towards the inner side or the outer side in a staggered mode, and then an inner locking piece used for locking the inner spiral supporting body and an outer locking piece used for locking the outer spiral supporting body are formed. In this way, the requirements for automatic punching and assembling of the reinforced pump cover are met, the reliability of connection between the pump cover body and the inner spiral supporting body and between the pump cover body and the outer spiral supporting body is high, connection is achieved without additional tedious procedures, and the manufacturing cost is reduced.

The invention belongs to the field of water pump runner blade design, and particularly relates to a centrifugal pump runner blade parameterization modeling and optimizing method and system.The method comprises the steps that firstly, a runner three-dimensional initial model is built according to parameters such as the inlet diameter and the outlet diameter of a runner in combination with a traditional unary theory design method; secondly, flow paths of an inlet, an outlet and front and rear cover plates of the section of a runner shaft are extracted, multiple streamlines on the runner blades are extracted at equal intervals, multiple control curves of the front and rear cover plates of the runner, blade bone lines, thickness and the like are expressed through a Bezier fitting line method, and a parameterized model of the runner blades is constructed; establishing a numerical model, and performing analog calculation to obtain multiple groups of runner external characteristics; and finally, performing iterative optimization in combination with a multi-target genetic algorithm to obtain an optimal solution. According to the method, the hydraulic optimization process of the rotating wheel is accelerated, and technical reference is provided for external characteristic optimization of the centrifugal pump.

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 centrifugal pump accessory positioning and machining, in particular to a centrifugal pump accessory positioning and machining device which is characterized in that a lifting mechanism and a rotating mechanism are arranged on the front side of a lifting console up and down, a positioning mechanism is arranged on the lifting mechanism, and a welding mechanism is arranged on the positioning mechanism; through cooperation of the positioning mechanism and the welding mechanism, the blades can be rapidly put, discharged and precisely guided and positioned, and the discharged and positioned blades can be rapidly connected to be fastened and abutted tightly and synchronously welded at the inner end and the outer end; according to the invention, through cooperation of the slewing mechanism and the lifting mechanism, not only can rapid transposition adjustment be carried out on a flat cover plate which completes blade welding and a flat cover plate which is not welded with a blade, but also blade positioning welding processing can be carried out on the flat cover plate which is not welded with the blade at the same time; and the arc-shaped cover plate on the flat cover plate subjected to blade welding is pressed and positioned so as to be matched with external welding equipment for welding machining.

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 a high-rotating-speed multi-stage centrifugal pump supported by an air film. Efficient liquid conveying is achieved through unique design. A motor in the driving mechanism is powered on, power is stably transmitted to a pump shaft through a coupler, and a multi-stage impeller is driven to rotate at a high speed. Liquid flows in from the water inlet in the bottom of the pump body, obtains speed energy under the centrifugal force of the impeller and is converted into pressure energy through the multi-stage guide vanes, and efficient conveying is achieved. Gas is stored in a gas chamber in a stator of the air bearing and forms an air film through a multi-stage shrinkage nozzle to support a pump shaft, friction resistance is reduced, and high rotating speed is adapted. The rubidium magnet in the rotor shaft sleeve interacts with the magnetic fluid cavity, so that sealing is enhanced, and adjustment is assisted. The mechanical seal and the oil seal prevent liquid leakage and protect the air bearing. An overflow cavity and an overflow groove adjust pressure in the pump, a water inlet filter screen intercepts impurities, and a pull rod stabilizing structure is reinforced. The centrifugal pump effectively solves the problem of a traditional centrifugal pump at a high rotating speed and has the advantages of high efficiency, stability, long service life and the like.

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 relates to the field of centrifugal pumps, and particularly discloses an intelligent cleaning and back flushing multi-stage centrifugal pump which comprises a multi-stage centrifugal pump body, a water inlet formed in the side face of one end of the multi-stage centrifugal pump body and a water outlet formed in the top of one end of the multi-stage centrifugal pump body. A hollow switching shell is arranged on the side face of the water inlet in a communicating mode, an inner cavity of the switching shell is cylindrical, a filtering switching assembly is arranged on the inner side of the switching shell and comprises a switching shaft rotationally arranged in the middle of the inner side of the switching shell, and a pair of oppositely-arranged filtering plates are arranged on the side wall of the switching shaft. According to the intelligent cleaning and back flushing multi-stage centrifugal pump, through mutual cooperation of the switching shell, the filtering switching assembly, the first sealing plate, the water pressure sensor and the pipeline assembly, blockage monitoring and automatic cleaning can be achieved while filtering and impurity blocking are achieved, shutdown is not needed, and the efficiency 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 utility model relates to the field of centrifugal pumps, in particular to an automatic exhaust type low-cavitation double suction pump which comprises a motor, a pump body in transmission connection with the motor and an air ejector. The controller is in communication connection with the motor, the pressure module is used for detecting the pressure of a liquid outlet of the pump body, the venturi tube is located on the outer side of the pump body, a negative pressure opening of the venturi tube is connected with an exhaust opening formed in the top of the pump body through an exhaust pipe, and a positive pressure inlet of the venturi tube is connected with a pressure air source through an air inlet pipe. A positive pressure outlet of the venturi tube is connected with the atmosphere, an air inlet valve is installed on the air inlet pipe, an air suction valve is installed on the exhaust pipe, and the air inlet valve and the air suction valve are in communication connection with a pressure module through a controller. And normal operation of the pump is ensured.

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 belongs to the field of fluid machinery, and particularly discloses a centrifugal pump volute with a composite noise reduction structure. The centrifugal pump volute comprises a volute body with the base circle radius being R. A volute chamber is formed in the volute body, and a plurality of micro flow deflectors are distributed on the inner side of an inlet of the volute body in the circumferential direction; two sections of semicircular grooves are symmetrically formed in the upstream section of the volute inner wall baffle tongue front and back along the spiral line; two flow guide plates are arranged at a baffle tongue of the volute body, the flow guide plate close to one side of an inlet of the volute body is a front flow guide plate, and a plurality of flow guide holes are formed in the front flow guide plate; a plurality of cavities are uniformly arrayed on the wall surface of the baffle tongue of the volute body; and the bending directions of the micro flow deflectors and the flow deflectors are consistent with the water flowing direction. Inlet flow is optimized through the micro flow deflectors, vortex is restrained through the semicircular grooves, pressure pulsation is reduced through cooperation of the flow deflectors and the cavity structure, the hydraulic performance is kept while fluid noise is effectively reduced, and the comprehensive performance is obviously 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 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 belongs to the related field of pump test devices, and discloses an integrated solid-liquid two-phase flow centrifugal pump PIV test bench. The test bed is composed of a solid-liquid two-phase recycling system and a PIV test system. Through the integrated arrangement of the circulating water tank, the circulating pipeline, the particle recovery pipeline and the test pump, the structure of the test bench is more compact, and the occupied space required by the test bench is greatly reduced. A water absorber and a particle recoverer in the water tank are respectively connected with a circulation pipeline and a particle recovery pipeline, so that circulation and recovery of particles in the system are realized; the funnel-shaped solid-liquid two-phase mixing cavity enables two-phase flowing and mixing to be more uniform; the vertical arrangement of the inlet pipeline effectively solves the problem of deposition of solid particles in the inlet pipeline due to gravity action.

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 invention relates to a multi-stage centrifugal pump transition flow channel and a flow channel design method. The transition flow channel comprises a delivery chamber, a flow channel diffusion section and a suction chamber. An outlet of the delivery chamber located at the upper stage is communicated with an inlet of the flow channel diffusion section, and an outlet of the flow channel diffusion section is communicated with an inlet of the suction chamber; the delivery chamber is of a double-volute structure and is symmetrically arranged about the center line of the volute, and the sum of the areas of the two symmetrical throats is equal to the area of a single volute; the flow channel diffusion section obliquely penetrates through the pump body, the internal sectional area of the flow channel diffusion section is gradually increased in the direction from an inlet to an outlet until the sectional area is equal to or slightly smaller than the inlet area of the suction chamber, the flow channel diffusion section is symmetrically arranged about the center line of the volute, and the suction chamber is symmetrically arranged about the center line of the volute. The radial force can be basically balanced, so that the pump operates stably, and the noise and vibration of a unit are reduced; the radial size of the pump body is small and space is saved; the efficient range is wide; the axial distance of the transition flow channel is reduced, and the axial size of the pump body is reduced.

The centrifugal pump comprises a pump body, a pump shaft, a sealing mechanism, an impeller and an axial magnetic flux motor. The pump shaft is rotatably installed on the pump body through a sealing mechanism, and a sealing cavity is formed in the pump body. The impeller is installed on the pump shaft and located in the sealing cavity, at least one end of the pump shaft is provided with an axial magnetic flux motor, the axial magnetic flux motor drives the impeller to rotate through the pump shaft, and conveying of fluid is achieved. According to the centrifugal pump, the axial magnetic flux motor is adopted as a driving mechanism, a common base, maintenance and centering are not needed, a bearing box of the pump is not needed either, the overall structure can be greatly simplified, and the occupied area is reduced.

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.