278 results about "Cavitation" patented technology

The invention relates to the technical field of monitoring and early warning, and discloses an automatic monitoring and early warning method and system for a pump room. The method comprises the following steps: collecting hydraulic pulsation, cavitation acoustic emission and bearing temperature rise data through multiple sensors; a pump efficiency attenuation vector is obtained based on an environment adaptive algorithm optimization feature; predicting the health state of the equipment by using a hydraulic model; carrying out deep learning classification by adopting a fault propagation network; and four-stage grading early warning is realized by combining water inflow-pump efficiency coupling judgment. According to the method and the device, the technical problem that the gradual change fault and the multi-parameter coupling fault mode of the pump room equipment under the underground complex working condition cannot be accurately identified in the prior art is solved, and the accuracy of fault prediction and the timeliness of early warning of the underground drainage pump room are improved.

The invention provides a numerical calculation method for double-explosion-source underwater explosion impact cavitation loads, and belongs to the technical field of computer data processing-based explosion impact wave calculation, and the method comprises the following steps: solving a propagation process of far-field underwater double-explosion-source explosion impact waves in a two-dimensional acoustic flow field by using a local discontinuous Galerkin (LDG) method; and the cavitation characteristics of the flow field under the action of the double-explosion-source underwater explosion shock waves are researched. A flow field dynamic pressure result calculated by the method is compared with a result calculated by an acoustic finite element method. The result shows that the flow field dynamic pressure result calculated by the method is well matched with the calculation result data of the acoustic finite element method, and the effectiveness and the accuracy of the method are verified.

The invention relates to the technical field of ball valves, provides an intelligent sensing modular ball valve and a control method, and designs a valve body module and a control module. The valve body module is integrated with a multi-mode sensor, comprises a spirally-distributed acoustic sensor array, a physical quantity sensor group and a valve element state detection sensor, and monitors fluid acoustic characteristics, pressure, temperature, flow, liquid level and valve element displacement and torque in real time. The control module analyzes sensor data through a data fusion algorithm, and early identification of cavitation faults and detection of micro-crack faults are achieved. The system adopts an 8-bit dynamic coding mechanism to accurately position the fault type, and adjusts the opening or torque of the actuator in a linkage manner. The method has multi-parameter cooperative sensing, early fault early warning and self-adaptive control capabilities, and the reliability and safety of the ball valve under complex working conditions are remarkably improved.

The invention discloses a slurry circulating pump state monitoring method and related equipment, and aims to overcome the defects of high false alarm rate and late early warning caused by multi-fault coupling effect and strong background noise interference in the prior art. The method comprises the following steps: synchronously acquiring vibration, acoustic emission, pressure pulsation and temperature signals of a pump volute, an outlet pipeline and a bearing seat; performing wavelet packet decomposition on the acoustic emission signals, extracting features and generating cavitation sensitive factors; a digital twinborn model adapted to fluid-structure coupling simulation and transfer learning is utilized to calculate a deviation value between the monitoring feature and a normal baseline; and when the deviation value exceeds a threshold value, fault identification and life prediction are carried out. Through multi-signal fusion and a dynamic threshold mechanism, a multi-fault coupling effect and strong background noise interference are effectively overcome, and the reliability of a monitoring system is improved.

The invention discloses a composite multi-frequency marine ultrasonic anti-fouling system and method, relates to the technical field of marine anti-fouling, and aims to change a single-frequency or simple-pulse ultrasonic transmitting mode, transmit composite multi-frequency ultrasonic waves in a wide frequency band, and superpose the ultrasonic waves of multiple frequencies in a transmission medium to generate a cavitation effect so as to achieve the anti-fouling effect. The method is used for avoiding the tolerance of marine organisms, improving the anti-adhesion efficiency and enhancing the effect of a specific area; the wave generating frequency and the working frequency are dynamically adjusted according to the running state and the environment condition of the ship, the energy consumption and the biological adhesion rate of the ship are reduced, and the relation among the biological adhesion rate, low energy consumption and the environment protection requirement is balanced.

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

The invention relates to an ultrasonic atomization pulse type cold air jet cooling and lubricating device and an operation process thereof. The device comprises an air compressor, a cold air generator, a gas storage tank, a pulse control valve and an ultrasonic atomization nozzle module which are sequentially connected through a gas pipeline. The ultrasonic atomizing nozzle module comprises an ultrasonic transducer, a stepped amplitude-variable rod, a waterproof cover, a sealing cover and a focusing nozzle. In the working process, the stepped amplitude-variable rod amplifies the high-frequency mechanical vibration amplitude of the ultrasonic transducer, and cutting fluid is efficiently atomized into micron-sized liquid drops through the cavitation effect and the capillary wave effect; meanwhile, the cold air generator converts high-pressure air provided by the air compressor into low-temperature gas and temporarily stores the low-temperature gas in the gas storage tank, and the low-temperature gas is released in a pulse mode through the precise pulse control valve according to the set frequency and duty ratio. The pulse low-temperature gas enters the sealing cover to be fully mixed with the atomized liquid drops, uniform gas-liquid two-phase jet flow is formed, finally, the jet flow is accelerated by the focusing nozzle to form high-speed convergent jet flow, the high-speed convergent jet flow acts on a cutting area accurately, and pulse type efficient cooling and lubricating cutting machining is achieved.

The invention discloses a multi-stage coupling jet enhanced shear mixing aeration system and an application method thereof. The aeration system comprises an air inlet section, a liquid inlet section, a bubble generator connected to the common downstream of the air inlet section and the liquid inlet section, and a regulating valve and an aeration tank which are sequentially connected to the downstream of the bubble generator, the bubble generator sequentially comprises a gas-liquid mixing unit, a rotational flow shearing unit, a turbulence strengthening unit and an oscillation self-excitation unit from upstream to downstream; according to the invention, negative pressure air suction, vortex shearing, hydrodynamic cavitation effect and the like are integrated in a device without a moving part; the gas-liquid mixture is crushed into nanoscale bubbles at the tail end turbulence section; the method has the remarkable advantages of lower energy consumption, higher bubble nucleation rate, smaller particle size and more uniform distribution. In addition, due to the unique multi-flow-field coupling design, adaptability to different water qualities is higher, and stable and efficient nanobubble generation capacity can be kept under wider working conditions.

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 pumped storage power stations, and discloses a pumped storage power station transient safety monitoring method, a pumped storage power station transient safety monitoring device, a storage medium and a product. The requirement of real-time simulation in the transient process is met; the cavitation volume fraction is obtained through three-dimensional simulation, and the influence of the volume of gas generated by cavitation on the compressibility of the water body is determined. Further, the influence degree of working condition parameters on the wave velocity is determined in combination with sensitivity analysis, and physical mapping logic is provided for a wave velocity prediction model; and a high-precision mapping model of the working condition parameters and the wave velocity is constructed by utilizing a machine learning algorithm, so that rapid prediction of the wave velocity is realized, the calculated amount of traditional cross-scale simulation is reduced, and the real-time performance is improved. Furthermore, when cavitation occurs, dynamic monitoring of transient safety of the pumped storage power station is realized through fusion of the wave velocity prediction model and one-dimensional transient simulation.

A system and method for determining fluid quality or change in quality by training machine learning algorithms using ultrasound Fast Fourier Transform (FFT) signatures. The system includes one or more ultrasonic transducers embedded inside or outside of a pipe, piping, or vessel that allows a fluid to flow past or between the ultrasound transducers. The transducer's acoustic energy creates ultrasound pressure waves and localized heat due to acoustic cavitation. The cavitation creates bubbles that collapse creating ultrasound sonic energy in the time domain. Unique sonic time-domain signatures, distinctively associated with the characteristics of the fluids, are converted to FFTs to produce unique, well-defined frequency response signatures. Machine learning algorithms are used to identify, measure, and classify the unique frequency response signatures associated with a wide range of fluids.

The invention relates to a pressure static calibration method based on cavitation collapse and an R-P equation. In order to solve the problem of calibration result deviation caused by a traditional static calibration method of a high-dynamic-performance pressure sensor, the method provided by the invention takes transient pressure shock waves released in a cavitation collapse process as an excitation source, and the pulse width of the pressure shock waves released in the process is about 1 microsecond; the frequency band blank of microsecond-level static calibration is filled, a first-time cavitation collapse pressure peak value obtained through calculation in combination with a Rayleigh-Plesset equation and a dissipation formula of pressure shock waves in liquid is compared with a first-time cavitation collapse pressure peak value received by a pressure sensor, a pressure peak value difference value at the moment is obtained and serves as a peak value compensation error of the pressure sensor, and the frequency band compensation error of the microsecond-level static calibration is calculated. And completing calibration.

The utility model discloses an oblique radiation ultrasonic beriberi symptom treatment device which comprises a container containing cavitation liquid, at least one group of ultrasonic transducers are installed outside the container in an oblique upward sound wave irradiation mode, and feet placed in the container are cleaned and nursed by utilizing the cavitation effect of ultrasonic waves in water. According to the beriberi symptom treatment device with the oblique radiation ultrasonic waves, the ultrasonic transducer assemblies are installed in an oblique upward sound wave irradiation mode, the sound wave superposition principle and the change of the sound propagation direction are utilized, a standing wave non-uniform sound field is avoided, the cavitation effect of the sound field is further enhanced in different areas, and therefore cleaning, sterilization and massage strengthening on the feet are achieved.

The utility model discloses a multi-layer flow channel necking-down type ball valve, relates to the technical field of ball valves, and solves the problems that high-pressure fluid scours a sealing surface and is cavitated due to the fact that a conventional flow channel outlet shape cannot effectively rectify and depressurize fluid. A sleeve is installed in the flow channel, the sleeve and the flow channel are coaxially arranged, the sleeve extends to the outlet position from the inlet position of the flow channel, and the sleeve is fixedly connected to the inner wall of the flow channel. The outlet position of the flow channel and the outlet of the sleeve are in a necking shape with the inner diameter gradually reduced. The sleeve divides the flow channel into multiple layers, layered flowing of fluid can be achieved, mutual interference among the fluid is reduced, the turbulent flow generation probability is reduced, and impact abrasion of the fluid to a sealing face is relieved. The necking shape accelerates the fluid through the Venturi effect, can rectify and depressurize the fluid, optimizes the flowing state of the fluid, balances the pressure of inner and outer flow channels of the sleeve and inhibits the cavitation phenomenon, the fluid impact is closer to the center of the flow channel, the turbulence intensity at an outlet is reduced, and the direct impact on the sealing surface of the valve seat is reduced.

The invention discloses a multi-angle cavitation water jet ice breaking experimental device and method in an immersion state, and relates to the technical field of ice breaking devices.The multi-angle cavitation water jet ice breaking experimental device comprises a water tank supporting frame, a transparent water tank and a jet control mechanism are arranged in the water tank supporting frame, and the jet control mechanism is installed at the bottom of the transparent water tank and comprises an adjusting assembly and a nozzle assembly; the test piece impact assembly is used for impacting the fixed test piece and comprises a supporting assembly and a clamping assembly; the pressure output assembly comprises a high-pressure pump set, a high-pressure electromagnetic valve, a constant-pressure tank and a high-pressure pipe for connecting all the parts; the device can complete a cavitation jet ice breaking test in an immersion state, the nozzle can realize vertical movement and multi-angle jet operation through the position adjusting assembly, and experiment requirements of different jet target distances and different jet inclination angles can be met at the same time; linkage operation of the high-pressure electromagnetic valve and the high-pressure pump set can be achieved through computer control, and the testing effect is guaranteed.

The utility model discloses a material testing device under erosion and cavitation coupling action, which comprises a container, an ultrasonic transducer, an injector head and a circulating device, a placing table is arranged in the container, the ultrasonic transducer is used for being arranged above the placing table, the injector head is arranged at the lower end of the ultrasonic transducer, and the circulating device is arranged on the placing table. The circulating device comprises a booster pump, a liquid inlet of the booster pump is communicated with the container, and a liquid outlet of the booster pump is connected with the injector head through a pipeline; in the using state, the ultrasonic transducer is electrically connected with an ultrasonic power source through a wire. According to the utility model, the erosion medium is pumped into the injector head through the booster pump, and meanwhile, the ultrasonic transducer enables the erosion medium to generate a large number of bubbles in the injector head, so that the erosion medium with the bubbles impacts a test material at a high speed, and the test condition of the hydraulic mechanical material is met.

The utility model discloses a flow regime adjusting device for heavy sediment, which belongs to the technical field of building material stirring, and comprises a tank body and a tank cover arranged at the top of the tank body, a barrel body with a closed top end and an open bottom end is arranged on the inner side of the tank body, and a plurality of flow regime adjusting devices are arranged on the inner side of the barrel body. A feeding port and a discharging port are formed in the side wall of the bottom end and the side wall of the top end of the barrel respectively, a driving motor is installed on the upper surface of the tank cover, and the power output end of the driving motor is in transmission connection with a shaft rod extending to the inner side of the barrel. Meanwhile, small bubbles are formed in the liquid under the cavitation action of ultrasonic waves, and the bubbles expand and contract under the action of sound waves and finally collapse severely under high pressure to generate strong shearing force and shock waves, so that the materials are effectively mixed.

The invention relates to the technical field of spectral analysis, and particularly discloses an underwater intelligent detection machine system and method based on laser-induced breakdown spectroscopy, and the system comprises an underwater carrying platform, an orthogonal double-pulse laser-induced breakdown spectroscopy probe, a multi-sensor cooperative sensing module, a mechanical arm, a central control unit and a water surface control station. The method comprises the following steps: a first pulse vertically builds bubbles, and a second pulse parallelly enters the bubbles and is triggered according to delay time; the central control unit maintains a working distance of 1-2cm based on a distance measurement closed loop, and adaptively adjusts delay time and energy in combination with water depth pressure and cavitation feedback; and the water surface control station carries out denoising normalization on the spectrum calibration and carries out element qualitative and quantitative operation to generate an element distribution atlas. According to the method, plasma is excited in a cavitation bubble gas environment through orthogonal double pulses, and in-situ real-time high-sensitivity element detection of an underwater target is realized in combination with distance closed loop and parameter self-adaption.

The invention relates to the technical field of cavitation monitoring, in particular to a tidal current energy water turbine cavitation predicting and monitoring method which comprises the steps that S1, multi-sensor data of a tidal current energy water turbine are collected, and the multi-sensor data comprise vibration signals, ultrasonic signals and pressure signals; s2, performing frequency domain analysis on the vibration signal, and extracting an energy value of a high frequency band as a vibration characteristic value; s3, performing transmission attenuation analysis on the ultrasonic signal, and calculating an ultrasonic attenuation rate as an ultrasonic characteristic value; s4, performing frequency domain analysis on the pressure signal, and extracting a pressure pulsation amplitude at a blade passing frequency as a pressure characteristic value; s5, based on the vibration characteristic value, the ultrasonic characteristic value and the pressure characteristic value, the current cavitation state is determined through a cavitation state judgment rule; and S6, predicting the evolution trend of the cavitation state, and estimating the residual safe operation time of the water turbine under the current working condition. The cavitation recognition result is converted into a quantitative life index, and the method has engineering application value and safety guarantee capability.

The utility model relates to the technical field of cleaning equipment, in particular to a cleaning tool for cleaning miniature blind holes, which is provided with a supporting cavity, a top plate is arranged above the supporting cavity, a liquid inlet is formed in the supporting cavity, a liquid outlet pipe is arranged on the supporting cavity, the liquid outlet pipe is communicated with the supporting cavity, and supporting fins are arranged on the side wall of the liquid outlet pipe. Cleaning liquid is jetted into the blind hole of the part through the liquid outlet pipe, as the cleaning tool is completely immersed in the water tank of the ultrasonic cleaning machine, ultrasonic waves can directly act on the surface of the part and the interior of the blind hole, and the jetted cleaning liquid can directly wash dirt and impurities in the blind hole of the part, disperse bubbles and break a bubble barrier; the effective permeation and cleaning effect of cleaning liquid are ensured, ultrasonic cleaning can go deep into the fine and tiny positions of the blind hole, a dirt layer is dispersed, emulsified and stripped off through the cavitation effect and the acceleration effect, the dual functions of liquid jet flushing and ultrasonic cleaning are achieved, and the cleaning efficiency and quality are remarkably improved.

The invention discloses a two-dimensional near-free-surface underwater explosion cavitation forecasting method, and relates to the technical field of explosion.The method comprises the steps that a mixed fluid is regarded as a mixture of multiple fluid media, and a multiphase compressible fluid motion control equation related to state parameters of the mixed fluid before the mixed fluid reaches an equilibrium state and the mass fraction of the fluid media of all phases is constructed; then constructing a thermodynamic state equation of any k-phase fluid medium based on an NASG equation, and constructing a cavitation phase change equation after the mixed fluid completes phase change relaxation to reach an equilibrium state by considering the phase change process of a liquid phase and a steam phase when a flow field changes; and solving an equation set formed by a multiphase compressible fluid motion control equation, a thermodynamic state equation of each phase of fluid medium and a cavitation phase change equation in each cycle step to obtain a numerical forecasting result. According to the method, cavitation is regarded as the continuous accumulation process of the steam phase content in the mixed fluid, the physical essence is better met, and therefore the forecasting result is more accurate.

The utility model relates to an underground cavitation water jet unblocking device, which comprises a jet packer and an eccentric pulse supercharger, the jet packer is connected with a crossover coupling among a packer upper joint, an upper central pipe and a leather cup inner pipe, and the crossover coupling and the upper central pipe are respectively provided with an overflow hole I; an overflow hole II and an overflow hole III are respectively formed in an eccentric cylinder and a lining pipe in the eccentric pulse supercharger; the upper central pipe is connected with the lower central pipe, and a cavitation water jet device provided with a cavitation nozzle is connected outside the lower central pipe between the jet packer and the eccentric pulse supercharger; a blocking ring is arranged at the lower end of the annulus of the cavitation water jet device and the lower center pipe, and a high-pressure jet annulus communicated with the overflowing hole is formed. The device has multiple effects of low-frequency hydraulic impact, cavitation entrainment, rotary shearing and vibration loosening of blockages, the cavitation effect is amplified through gas-mixed water excitation, the gas lift flowback effect of low-density gas-mixed water is better facilitated, and the blockage removal effect is remarkable.

The invention relates to the technical field of hot air, in particular to a high-frequency hot air enhancing method based on airflow cavitation, which comprises the following steps: acquiring a first gas volume flow rate at an air inlet of a hot air device and a second gas volume flow rate at an air outlet, whether the fluctuation of the hot air temperature at the air outlet is qualified or not is determined according to the stability characterization value based on the volume flow difference; a low-pressure area and a high-pressure area in the hot air device are determined according to the temperature distribution stereogram in the hot air device, and whether pressure gradient distribution is qualified or not is determined based on the low-pressure overlap ratio and the high-pressure overlap ratio; the rotating speed of the power mechanism is adjusted through a rotating speed adjusting coefficient based on the transition area distance, or the valve opening degree of the air inlet is adjusted based on the distribution uniformity characterization value of the eddy current density; and determining whether the cleaning period of the hot air device is qualified or not based on the reduction rate of the volume flow difference so as to adjust the cleaning period or adjust the self-cleaning power of the hot air device. The hot air temperature stability of the hot air device is improved.

The invention discloses a quantitative evaluation method for the cavitation effect of an emulsifying machine, and the method comprises the steps: obtaining the multi-source heterogeneous time series data of pressure, acoustics, current, temperature and the like in real time through various types of sensors, carrying out the synchronous calibration, signal standardization and efficient denoising, extracting the multi-dimensional and multi-scale statistics and frequency domain features, and carrying out the quantitative evaluation of the cavitation effect of the emulsifying machine. A working condition sensitive heterogeneous feature pool is formed through normalization and dynamic screening, feature weight distribution is achieved in combination with an emulsifying machine working condition label, the cavitation intensity and the influence index are dynamically calculated based on a self-adaptive multi-task cooperation model, and the cavitation monitoring accuracy, adaptability and long-term reliability of the emulsifying machine in a complex environment are effectively improved.

The utility model relates to the technical field of rapeseed treatment, and discloses an ultrasonic vibration cleaning structure and a rapeseed pretreatment all-in-one machine, the ultrasonic vibration cleaning structure comprises a cleaning frame, the whole cleaning frame is rectangular, and an ultrasonic generator and a transducer are installed in the cleaning frame; the movable assemblies are symmetrically arranged on the two sides of the cleaning frame, the movable assemblies are used for adjusting the position of the cleaning frame, each movable assembly comprises a first mounting frame, a first connecting block, a second mounting frame and a second connecting block, the first connecting blocks and the second connecting blocks are arranged on the two sides of the cleaning frame, and through cooperation of internal parts of the movable assemblies, the cleaning frame is driven to continuously ascend and descend; the cavitation effect of ultrasonic waves more uniformly covers a cleaning area, local cleaning blind areas caused by fixed positions are avoided, and the energy distribution of the ultrasonic waves in liquid may be uneven due to factors such as the shape of a container and the depth of the liquid. Different areas can be alternately exposed in the high-strength cavitation area by moving the device or the workpiece, and the overall cleaning effect is improved.

A method of removing microvessels includes applying a burst of acoustic energy at a target location, applying a pulse of optical energy at the target location, and promoting cavitation at the target location by synchronizing an arrival of the burst of acoustic energy and the optical energy at the target location. The burst of acoustic energy has a pressure below 5.0 MPa. The pulse of optical energy at the target location has a fluence less than 100 mJ / cm2. At least a portion of the pulse is concurrent with the burst and the optical energy has an optical area that is overlapping with an acoustic area of the acoustic energy at the target location.

A low energy liquid degasification device has a liquid reservoir connected to an input channel above it and a cylinder below it. The input channel has several embedded isolation valves which allow the channel to be closed off into several independent chambers. The cylinder has a piston capable of moving up and down under the action of an actuator located below it and which seals the cylinder. Upon filling the liquid reservoir, input channel, and cylinder above the piston with a largely incompressible and inexpansible liquid and sealing the isolation valves, the piston is moved downward increasing the enclosed volume and generating a vacuum. Agitation of the assembly produces cavitation and pressure waves inside, generating bubbling that removes dissolved gas from the liquid.

The invention provides a water heater water pump rotating speed control method, device and system, and relates to the technical field of water heater control. The method is applied to a control mainboard. The method comprises the steps that after a water pump is started, current water pump outlet pressure and current water pump rotating speed are obtained in real time; if the current water pump outlet pressure is lower than the current water pressure lower limit for generating cavitation noise corresponding to the current water pump rotating speed, reducing the current water pump rotating speed until the latest current water pump outlet pressure is not lower than the current water pressure lower limit for generating cavitation noise corresponding to the latest current water pump rotating speed; wherein the corresponding relation between the water pressure lower limit and the water pump rotating speed is positive correlation; the water pump outlet pressure changing speed along with the water pump rotating speed is smaller than the water pressure lower limit changing speed along with the water pump rotating speed. When the water pressure suddenly drops in the water consumption peak period of a user, noise and cavitation phenomena can be effectively reduced.

The application provides a distributed ultrasonic transducer array and a control method thereof. The distributed ultrasonic transducer array comprises a plurality of unit ultrasonic transducers, the outer contour of the amplitude rod of each transducer is provided with a plurality of continuous cylindrical sections in the axial direction, each section is composed of a first cylindrical surface and a second cylindrical surface, the generatrix is a circular arc or a broken line symmetrical about the center line, and each cylindrical section forms an acoustic focal point with different radial distances in the medium. The plurality of transducers are arranged along the pipeline, and the focal domain distribution of adjacent transducers is arranged in the same or complementary mode, so that the radial focal domain of each transducer is spatially staggered and the energy is superposed, forming a synthesized sound field with small sound pressure fluctuation and uniform distribution. The application can realize large-range and high-uniformity cavitation treatment with fewer ultrasonic transducers, and can realize spatial differentiation regulation and control of focal energy according to the concentration distribution of pollutants, thereby significantly improving the treatment efficiency and engineering economy.