20 results about "Cavitation bubble" patented technology

The application discloses a kind of based on wettability difference capillary ultrasonic microreactor and continuous efficient extraction method.The reactor includes sandwich type ultrasonic transducer and the capillary microreactor of segmented design along fluid flow direction: inner wall of front-end pipe section is coated with polytetrafluoroethylene, is hydrophobic, facilitate oil phase continuous and excite a large number of acoustic cavitation bubbles;Back-end pipe section is bare hydrophilic base material, guarantee efficient transmission of acoustic energy, enhance bubble vibration intensity.Through axial wettability gradient design, synergistic control cavitation bubble quantity and intensity, and induce liquid-liquid system to occur controllable phase state overturn in flow, significantly strengthen interface update and mass transfer.The system structure is compact, easy to operate, suitable for a variety of not mutually soluble liquid-liquid system, in 2-100 seconds can complete efficient extraction, compared with traditional microextraction method (2-60 minutes) efficiency is improved several times.

This invention discloses a method for identifying cavitation bubbles in high-velocity clouds based on adaptive multi-threshold segmentation, belonging to the field of cavitation bubble image recognition and fluid measurement technology. The method first uses a high-speed camera to acquire images of the evolution of dense bubble groups in a high-velocity cloud cavitation flow field. Based on the image's grayscale distribution characteristics, the OTSU adaptive global thresholding method is used to determine the background noise threshold and the scattered light noise threshold, respectively. On this basis, an adaptive multi-threshold segmentation algorithm is constructed, combining grayscale threshold sequences and bubble diameter threshold sequences for multi-round identification. Connected component analysis and area compensation are used to separate adherent bubbles and accurately extract small-scale bubbles. This invention can adapt to environments with high flow rates, non-uniform illumination, and uneven bubble distribution, achieving high-precision, non-invasive identification and statistical analysis of tiny bubbles inside cloud cavitation.

This utility model provides a brake disc cleaning mechanism, including an ultrasonic cleaning tank. A mounting box is located at the rear of the ultrasonic cleaning tank. Multiple guide pillars are arranged inside the mounting box, and a lifting frame plate is slidably arranged between the outer arc surfaces of the guide pillars. Multiple support plates are arranged on the inner wall of the lifting frame plate, and a bearing pillar is arranged on the right side of each support plate. A limit locking mechanism is provided inside the lifting frame plate to limit the movement of the brake disc during cleaning. With this brake disc cleaning mechanism, the brake disc is suspended in the cleaning tank, allowing both sides to directly contact the ultrasonic cleaning fluid and cavitation bubbles, ensuring that all surfaces are thoroughly cleaned. This avoids blind spots caused by contact with the cleaning frame and eliminates the need for manual rotation of the brake disc, reducing operational steps, improving overall work efficiency, and minimizing downtime.

The present invention relates to a method for reducing a first pressure fluctuation in a fluid in a fluid-carrying element of a temperature control device for a directly position- or shape-sensitive or an indirectly position- or shape-sensitive element of a lithography system, comprising acquiring information associated with the first pressure fluctuation in the fluid-carrying element, determining, based on the acquired information, an optical power to be introduced into the fluid-carrying element in order to counteract the first pressure fluctuation, and introducing the determined optical power into the fluid in the fluid-carrying element in order to generate a cavitation bubble in the fluid, thereby generating a second pressure fluctuation in the fluid which counteracts the first pressure fluctuation.

The application provides a device and method for preparing secondary micro-dimple by near-wall laser-induced double cavitation bubbles, and relates to the technical field of laser strengthening, and comprises a laser system, a beam expanding and focusing system, a climbing system, a light splitting system, a glass tank, a liquid medium, a material to be processed, an electric three-dimensional moving platform, and the beam expanding and focusing system comprises a beam expander, a left focusing lens and a right focusing lens; the laser emitted by the laser system is evenly divided into two symmetrical paths through the beam expander, the climbing system and the light splitting system, and the two paths of laser are focused by the left focusing lens and the right focusing lens respectively, and then simultaneously break through the liquid medium from top to bottom, the focal points act on the surface of the material to be processed, and cavitation bubble one and cavitation bubble two are simultaneously formed on the surface of the material to be processed, the double cavitation bubbles generate superposition to form a composite interference zone in the pulsation evolution process, and the secondary micro-dimple is prepared on the surface of the material to be processed in the composite interference zone. The secondary micro-dimple is prepared by the double cavitation bubble interference zone, and the strengthening effect on the surface of the material is effectively improved.

This utility model belongs to the field of cavitation heat pump technology, specifically a cavitation heat pump capable of noise reduction. It includes a base, a working motor fixedly connected to the top edge of the base, a rotating shaft fixedly connected to the output end of the working motor, a pump casing mounted on the outer wall of the rotating shaft, and a pump body fixedly connected to one end of the rotating shaft. A cavitation drum, fixedly connected to the inner wall of the pump casing, is sleeved on the outer wall of the pump body. The outer wall of the cavitation drum has cavitation holes, and a protective frame is fixedly connected to the outer wall of the pump body. This utility model, by incorporating a sponge and a connecting plate, absorbs the noise generated by the bursting of cavitation bubbles. Simultaneously, the pump casing vibrates, causing the connecting plate to vibrate synchronously. This transmits energy to a first damping spring via a lifting plate and to a second damping spring via a telescopic plate, thus reducing vibration of the pump casing.

The present application provides an ultrasonic microcavity reactor, comprising a reactor main body and an ultrasonic wave generating device, the reactor main body is installed in the ultrasonic wave radiation surface of the ultrasonic wave generating device; at least one microcavity unit is arranged in the reactor main body, the microcavity unit is a hollow pipeline structure extending along the horizontal axis, the inner diameter of the cavity of the microcavity unit includes an axial gradually expanding section and an axial gradually reducing section in sequence along the fluid flow direction, the cross-sectional area of the axial gradually expanding section continuously increases from the inlet end to the outlet end, and the cross-sectional area of the axial gradually reducing section continuously reduces from the inlet end to the outlet end. The microcavity unit is designed as a cyclone cavity with axial gradually expanding and gradually reducing structure, so that the hurricane type cavitation bubble group can be formed in the reaction cavity of the ultrasonic microcavity reactor. Compared with the conventional ultrasonic cavitation reactor, the hurricane type cavitation bubble produced by the present application has concentrated sound field distribution, strong shearing capacity and good mixing and emulsification effect.

The application relates to the technical field of cavitation, and discloses a cavitation generating device and a collision equipment, which comprises an input pipeline and a first cavitation unit which are sequentially communicated, the first cavitation unit comprises a first cavitation shell with a first cavitation chamber and a flow guide groove which penetrates through the first cavitation shell and is communicated with the input pipeline and the first cavitation chamber at both ends, the flow area of the flow guide groove is smaller than the flow area of the input pipeline and the first cavitation chamber, the flow guide groove is configured to generate cavitation bubbles of fluid, and the first cavitation chamber is configured to make at least part of the cavitation bubbles collapse. Through the technical scheme, fluid enters the flow guide groove and generates cavitation bubbles, then the fluid enters the first cavitation chamber, and at least part of the cavitation bubbles collapse in the first cavitation chamber to generate cavitation. The cavitation generating device simplifies the structure of the cavitation generating device, and avoids the problem that the cavitation generating device is prone to be blocked.

This invention relates to the field of cavitation reactor technology, and more particularly to a multi-stage heterogeneous reflux trough type Venturi cavitation reactor, comprising a contraction section, a throat, and an expansion section arranged sequentially along the fluid flow direction. The inner wall of the expansion section near the throat is recessed to form multi-stage spaced annular grooves. These multi-stage annular grooves are at least divided into an induced reflux groove, a stepped shearing and breaking groove, a strong reflux retention groove, and a re-collapse recovery groove along the fluid flow direction. This invention, by setting at least four heterogeneous reflux grooves in the expansion section to form a multi-stage cavitation enhancement section, extends the effective cavitation zone. Furthermore, the multiple annular grooves along the flow direction respectively achieve induced bubble capture, stepped shearing, strong reflux retention, and re-collapse recovery, enabling staged control of the cavitation bubble development process.

The application discloses an automatic cleaning device for geothermal well maintenance and relates to the technical field of geothermal well cleaning devices, which comprises a pipeline adaptive cleaning assembly, which is inserted into a geothermal well and can clean the inner wall of a pipeline with different sizes and diameters in the geothermal well, and a magnetic connection structure is connected to the top of the pipeline adaptive cleaning assembly; through the cooperation of the pipeline adaptive cleaning assembly, the shaft joint mechanical arm and the magnetic connection structure, the whole can accurately adapt to vertical, curved and variable-diameter pipelines through the cooperation of laser ranging and the screw block adjusting structure, the cooperation of the self-driving wheel and the transmission rod structure, the problems of pipe jamming and blind area of traditional equipment are solved, the setting of the coincidence of the ultrasonic focus and the high-pressure water flow center is utilized, the composite effect of cavitation bubble impact and mechanical water flow cleaning is formed, the hard scale removal efficiency is effectively improved, and through the cooperation of the variable-angle inclined nozzle and the adjustable spray hole structure, the circumferential coverage and accurate attack on different scales can be realized.

This invention discloses a cavitation protection system and method for a feedwater pump set, comprising a main thermal system, a bypass system, a micro-flow field actuator, and an intelligent control center. The intelligent control center calculates the deaerator pressure change rate. When the rate is less than the feedforward trigger threshold, it drives a high-frequency servo solenoid valve to open. High-pressure fluid is accelerated through a micro-contraction nozzle to form a fluid micro-jet, flowing along the asymmetric Coanda wall-attached rectifying surface. This injects momentum into the fluid boundary layer of the first-stage impeller suction surface, increasing the local static pressure of the fluid to exceed the saturated vapor pressure. This pressure difference physically compresses the micro-vaporization nuclei, inhibiting the formation of macro-cavitation cavitation bubbles. The control hysteresis loop interval is used to suppress frequent start-stop of the actuator. This invention achieves the destruction of the physical critical condition for the volume expansion of vaporization nuclei, utilizes a positive suppression pressure difference to compress the volume of micro-vaporization nuclei, thereby blocking the formation of macro-cavitation cavitation bubbles and maintaining continuous liquid phase flow in the impeller, thus providing cavitation protection.

The present application belongs to the technical field of cleaning efficiency optimization, and specifically discloses an efficiency optimization method for cleaning offshore light buoys based on cavitation jet, which collects the ship attitude and the target distance between the nozzle and the light buoy in real time, samples the target distance sliding window to determine whether to trigger distance adjustment, identifies the wave main frequency period based on the attitude data when triggered, divides the wave main frequency period into phase intervals and extracts the phase angular velocity, locks the target distance adjustment phase window, predicts the wave displacement change trend in the window, matches the distance adjustment mode containing the action direction and the response speed mode, and finally generates the target distance adjustment operation instruction and outputs it to the display terminal of the ship operation management system. The present application can accurately lock the target distance adjustment opportunity, adaptively compensate the target distance fluctuation caused by the wave, thereby ensuring the stable collapse of the cavitation bubble, avoiding ineffective cleaning, and greatly improving the offshore light buoy cleaning operation efficiency.

The present invention relates to a method for reducing a first pressure fluctuation in a fluid in a fluid-conducting element of a temperature-control device for a directly position-sensitive or shape-sensitive or an indirectly position-sensitive or shape-sensitive element of a lithography system, the method comprising: detecting information associated with the first pressure fluctuation in the fluid-conducting element; determining, on the basis of the detected information, an optical power to be introduced into the fluid-conducting element in order to counteract the first pressure fluctuation; and introducing the determined optical power into the fluid in the fluid-conducting element in order to produce a cavitation bubble in the fluid, as a result of which a second pressure fluctuation is generated in the fluid which counteracts the first pressure fluctuation.

This application relates to a method, system, apparatus, and medium for predicting cavitation bubble collapse processes. The method includes: acquiring initial time data of the cavitation bubble collapse process and performing dimensionless processing on the initial time data to obtain dimensionless coefficients; based on the dimensionless coefficients, transforming a pre-defined cavitation dynamics equation into a dimensionless equation; and based on the dimensionless coefficients and the dimensionless equation, constructing an expression for the cavitation bubble collapse process using a variable substitution method. This expression characterizes the evolution of the dimensionless radius of the cavitation bubble collapse process; that is, the collapse time of the cavitation bubble is obtained when the dimensionless radius in the expression equals zero. This application achieves dimensionless transformation of the cavitation dynamics equation and uses a variable substitution method to construct an expression for the cavitation bubble collapse process, intuitively characterizing the cavitation bubble collapse process under arbitrary initial velocities. It has advantages such as simple process, strong universality, and no need for complex numerical simulations.

This invention provides an ultra-large diameter piston-type regulating valve, belonging to the field of regulating valve technology. It includes a valve body, regulating chamber, and piston valve core, as well as a detection module, a control module, and an actuator. The invention uses the detection module to collect real-time data on the crank rotation angle θ, upstream pressure P1, and downstream pressure P2. The control module then performs logical judgment based on a preset first angular displacement warning point R. When the crank rotation angle θ is less than or equal to the first angular displacement warning point R, the system automatically enters a dynamic anti-cavitation mode, driving the second regulating component to precisely move the sliding sleeve axially, constructing an adjustable pressure buffer step in the flow channel. This actively raises the static pressure at the narrowest flow section, fundamentally suppressing the generation of cavitation bubbles. This invention solves the problem of cavitation damage to ultra-large diameter piston valves under high pressure differential and small opening conditions, achieving intelligent switching and balance between cavitation suppression and flow efficiency.

This application discloses a high-energy single cavitation bubble generating electrode device, relating to the fields of industrial ionic liquid and medical wastewater treatment technology. In this device: a water quality sensor unit detects the water quality parameters of the liquid medium in real time; a dynamic allocation unit is used to preset the initial output parameters of the high-voltage power supply, the initial discharge parameters of the pulse source, and the initial switching sequence of the high-speed switch based on the detected water quality parameters before the discharge begins; during the discharge process, the output power of the high-voltage power supply and / or the discharge parameters of the pulse source are adjusted according to the circuit feedback signal, and the switching timing of the high-speed switch is adjusted; the first high-speed switch and the second high-speed switch switch sequentially according to the control signal, so that the initial high-voltage circuit and the pulse discharge circuit are connected in a time-sharing manner to inject residual voltage into the cavitation bubble growth stage, realizing the concentrated injection of energy into a single cavitation bubble. This application achieves the concentrated injection of energy into a single cavitation bubble, improving energy utilization efficiency and the concentration of the cavitation effect.

The application provides a cavitation bubble cleaning effect experiment device and method, and belongs to the technical field of high-voltage pulse discharge bubble generation. The device comprises: an equipment frame, a container box and a stand fixed on the operation platform of the equipment frame; the stand is provided with a slidable sliding block, the sliding block is connected with a cross frame, two horizontal moving support blocks are fixed on the cross frame, two tungsten needle electrodes of a high-voltage pulse bubble generation assembly are respectively fixed on the two horizontal moving support blocks, and the lower ends of the electrodes are immersed below the liquid surface of the container box; and an experiment plate coated with pollutants is immersed below the liquid surface. The method comprises the following steps: a camera shoots a picture P of the experiment plate after cleaning; a host computer calculates the pixel gray value in P, compares the pixel gray value with a set threshold value, and counts the number of pixels with a gray value less than the threshold value, so as to explore the optimal cleaning distance between the electrodes and the object to be cleaned when the distance between the two tungsten needle electrodes is unchanged. The device has a compact structure, the cleaning effect is quantified by the gray value statistics, and experimental basis is provided for optimizing the electrode distance.

The application relates to the technical field of low-temperature fluid testing, in particular to a low-temperature liquid column separation cavitation bubble motion characteristic testing device. The application comprises a testing tube which is located in a low-temperature environment and can slide along the axial direction of the testing tube, the two ends of the testing tube are respectively an impact end and a loading end, a variable stiffness impact module and an initial force loading module are arranged at the impact end and the loading end respectively, the initial force loading module acts on the loading end and pushes the testing tube to move axially to collide with the variable stiffness impact module, wherein the initial pushing force of the initial force loading module on the loading end is adjustable, and the support stiffness of the impact part of the variable stiffness impact module which is collided by the impact end is adjustable. The application can realize the decoupling control of the initial velocity and the collision acceleration of the testing tube, and provides a key experimental hardware research platform for the fluid system optimization design of low-temperature fluid engineering.

This invention discloses a real-time monitoring system for ultrasonic cleaning processes using a visualization window, relating to the field of charger technology. It includes the following steps: Step S100: Three-dimensional cavitation field modeling: A cavitation bubble point cloud is acquired using a 4D ultrasonic transducer array and a visualization window optical sensing unit, and a three-dimensional cleaning model is constructed by combining multi-physics coupling analysis. By building a dual-dimensional acquisition system of a 4D ultrasonic transducer array and a visualization window optical sensing unit, and combining multi-physics coupling analysis to construct a three-dimensional cavitation field model, a genetic algorithm is used to optimize the transducer phase parameters for different operating frequencies. Combined with 5×5 median filtering and ray tracing algorithms, high-precision denoising, calibration, and registration of multi-source data are achieved. Simultaneously, accurate acquisition of parameters such as flow rate and temperature is achieved through dynamic calibration of standardized sensors.

This invention relates to the field of ore processing technology, specifically to a flotation device and process for high-efficiency extraction of gold, comprising a flotation cell; a stirring mechanism for mixing the slurry; a reagent dosing mechanism for adding reagents to the slurry; a guiding mechanism for guiding the flow of the slurry; and a bubble generating mechanism for generating bubbles in the slurry. The stirring mechanism is disposed on the flotation cell, the reagent dosing mechanism is disposed on the side of the flotation cell, the bubble generating mechanism is disposed inside the flotation cell, and the guiding mechanism is disposed on the bubble generating device. The combination of the ultrasonic generating device and the guiding plate can form a synergistic effect. The guiding plate guides the flow of the slurry, extending the flow path of the slurry. Simultaneously, the ultrasonic generating device vibrates the guiding plate, utilizing the cavitation effect generated by the ultrasonic waves inside the slurry to form a large number of small-diameter bubbles at different depths. The microjets and shock waves generated when the cavitation bubbles collapse improve the mass transfer efficiency of oxygen to the slurry.