18 results about "Cavitation erosion" patented technology

The utility model discloses an integrated type swing cycle pump lubricating device, including pump casing, inner rotor and outer rotor, be provided with oil cavity and with oil inlet and oil outlet of oil cavity communication on the pump casing, its characterized in that, the bottom of oil cavity is provided with annular unloading groove with oil outlet communication, and the bottom surface of annular unloading groove is multistage step surface. This integrated type swing cycle pump lubricating device can effectively buffer fluid resistance and pulsation, reduce cavitation and cavitation erosion phenomenon, and stabilize oil pressure of oil outlet.

The application discloses a novel anti-cavitation surface structure and a preparation method thereof. The anti-cavitation surface structure can change the wetting degree of a material surface, reduce gas nuclei near a liquid-solid contact surface, inhibit cavitation and cavitation erosion processes, and also reduce the damage of micro-jets to the material in the cavitation erosion process. The anti-cavitation surface structure layer is composed of a surface construction layer and a substrate. The working mechanism is as follows: firstly, the construction can change the wetting degree of the material surface, so that the gas nuclei near the liquid-solid contact surface are reduced, thereby slowing down the cavitation and cavitation erosion processes; secondly, the incident kinetic energy of the micro-jets in the effective construction area is consumed in the form of friction, thereby reducing the damage of the micro-jets to the material substrate. The application can effectively slow down the cavitation erosion process, weaken the influence of the micro-jets on the material substrate in the cavitation erosion process, and effectively resist the damage of the cavitation erosion to the material surface.

The application provides a water turbine flat pressure pipe cavitation erosion suppression structure based on pressure propagation timing control, which comprises a pipeline installation base and a flat pressure pipe inlet structure. The flat pressure pipe inlet structure is provided with a bottom plate part and a pipe body. A plurality of first through holes are arranged on the outer side of the pipe body along the circumference of the bottom plate part. A plurality of second through holes are arranged on the outer side of the first through holes along the circumference. A plurality of third connection interfaces are arranged on the pipe body along the length and the circumference. The pipeline installation base comprises a sleeve part. A flange part is arranged at one end of the sleeve part. The sleeve part is sleeved on the outer side of the pipe body. The sleeve part is provided with a plurality of third connection interfaces aligned with the third through holes. The flange part is provided with a plurality of first connection interfaces and second connection interfaces aligned with the first through holes and the second through holes. A pressure wave conducting pipe is communicated at each second connection interface. The other end of the pressure wave conducting pipe is closed. A plurality of communication openings are arranged on the pressure wave conducting pipe along the length direction. A plurality of timing adjustment pipes are further arranged. One end of each timing adjustment pipe is communicated with the third connection interface. The other end of each timing adjustment pipe is communicated with the first connection interface or the communication opening.

This invention relates to the field of soil slope monitoring technology, specifically to a method for monitoring cavitation erosion in dispersed soil slopes. The method involves acquiring soil moisture, soil temperature, air temperature, air humidity, current rainfall, slope runoff velocity, and images of the soil slope surface and surface water for a target dispersed soil slope. Based on these data, the method determines the rainfall erosion index and soil cavitation sensitivity index for the target dispersed soil slope. Finally, based on these indices, the method determines the risk level of cavitation erosion development for the target dispersed soil slope. This comprehensive and dynamic assessment of cavitation erosion in dispersed soil slopes improves the targeting and timeliness of slope disaster identification and diagnosis, thereby reducing slope disaster risks.

The embodiment of the present application provides an inducer and a turbopump, which are used for further improving the cavitation erosion resistance of the inducer. The inducer is suitable for a liquid rocket engine, and the inducer comprises a rotating shaft and blades fixed to the rotating shaft; a first development surface corresponding to the blades comprises a first region, and a part of the first development surface located in the first region is in a curve shape; the first development surface is a planar pattern obtained by unfolding a first section surface of the blades which is cut by a cylindrical surface of the rotating shaft on a shaft radius. The inducer and the turbopump provided by the embodiment of the present application can further improve the cavitation erosion resistance of the inducer.

This invention discloses a method for controlling the gradual change of multilayer composition in a liquid hydrogen pump composite coating, relating to the field of liquid hydrogen pump composite coating control technology, specifically a method for controlling the gradual change of multilayer composition in a liquid hydrogen pump composite coating. The method involves forming a bonding initiation layer on the surface of a liquid hydrogen pump substrate, followed by the sequential formation of multiple transition sublayers and a surface functional layer. After each transition sublayer is formed, a controlled perturbation is applied, and at least two types of post-layer recovery responses are collected from thermal response phase, acoustic response attenuation, and electrical recovery to generate a low-temperature recovery signature. Based on the low-temperature recovery signature, the risk type is determined, and the proportional relationship, layer thickness, and deposition energy of the toughness component, hardness component, and barrier component in the next transition sublayer are adjusted accordingly. The surface functional layer is formed after the low-temperature recovery signature continuously enters the target window, thereby obtaining a nonlinear composite gradient coating. This method is beneficial for improving the interface stability, resistance to cavitation erosion, and hydrogen barrier continuity of the liquid hydrogen pump composite coating.

The utility model discloses a water turbine set draft tube containing gas -solid coupling formula vortex belt suppression device, through setting up air supplementing pipeline and air inlet device, can when the unit appears unstable condition, supplement into air, destroy vortex belt, is used for reducing vibration, prevents cavitation erosion and reduces whirlpool intensity, sets up support piece, can fix air supplementing pipeline at the same time to the support effect of pipe wall, reduce the vibration of disadvantage factor, sets up the flow guide component, can destroy vortex belt stability when the water flow passes, prevents the damage of overflow part, through the mutual coupling of air supplementing and fixed flow guide component, support piece, guarantee the stable operation of unit to a great extent, compared with traditional single air supplementing mode, this scheme can further reduce the disadvantageous influence that vortex belt of draft tube produces to unit operation.

A cavitation-resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating is disclosed. The composite coating material comprises the following components by mass percentage: 15%–65% WC powder, 0.5%–3% TaC powder, 0.2%–1% rare earth oxide powder, and 31%–84.3% FeCrNiAlTi alloy powder. This invention utilizes laser cladding to prepare the FeCrNiAlTi high-entropy alloy / ceramic composite coating, which exhibits a metallurgical bond with the substrate. The coating is dense and uniform, with a porosity below 0.15%, essentially pore-free. The microhardness is increased to 350–580 HV. Under the same cavitation erosion test parameters, the coating's cavitation erosion resistance after 20 hours is 2.0–11.2 times that of the substrate. In wear tests, the volumetric wear rate of the coating after 2 hours is 1.0 × 10⁻⁶. ‑5 mm 3 ·N ‑1 ·m ‑1 ~1.28×10 ‑5 mm 3 ·N ‑1 ·m ‑1 Compared to stainless steel substrates, the corrosion resistance is reduced to 43.3-75%, offering the dual advantages of cavitation resistance and wear resistance.

This invention discloses a method and coating for repairing cavitation defects in martensitic stainless steel based on laser cladding of nickel alloy, relating to the field of metal surface engineering technology. The coating material of this invention is nickel alloy powder with a particle size of 50-150 μm, and its composition, by mass percentage, includes: 18-22% Cr, 3-5% Mo, 1.5-2.5% B, 2-3.5% Si, with the balance being Ni. The method for using this coating material to repair cavitation defects in martensitic stainless steel via laser cladding specifically includes the following steps: after grinding, cleaning, drying, and preheating the cavitation area of ​​the martensitic stainless steel, a coaxial powder-feeding laser cladding system is used to first deposit a transition layer on its surface using a single-pass scanning method, and then, under inert gas protection, a multi-pass overlapping cladding of the main coating layer is performed. After cooling, the repaired body is obtained. This invention, through the synergistic design of "transition layer buffering stress" and "optimized microstructure of the main coating with specific composition," greatly improves the problems of hardness and toughness, susceptibility to cracking, and poor cavitation resistance during the laser cladding repair of martensitic stainless steel.

This application relates to the field of hydraulic component monitoring technology, and in particular to a method and system for monitoring the operational status of a hydropower plant based on the Internet of Things (IoT). The method includes: acquiring a dynamic information set of hydraulic components; analyzing this information to obtain a primary damage information set; based on the dynamic information set of hydraulic components and the primary damage information set, analyzing how initial damage disrupts the hydrodynamic balance, inducing strong vibrations, which in turn cause dynamic loads in the runner area to abnormally expand the cavitation cloud and lead to its coordinated collapse, thus obtaining a cavitation cloud coordinated collapse information set; based on this, analyzing the abnormal transmission of vibration energy to the cavitation erosion area, causing the cavitation damage to be nonlinearly amplified, thus obtaining a damage-vibration coordinated amplification information set; and based on this, dynamically predicting the optimal intervention time and matching targeted repair strategies to generate a predictive and accurate maintenance log. This enables intelligent monitoring and maintenance of the hydropower plant's operational status, reduces the risk of failure, extends equipment lifespan, and improves overall operational efficiency.

This invention discloses a method and apparatus for dry in-situ magnetically controlled repair of cavitation erosion on turbine blades. The method includes: after the turbine is shut down and the accumulated water is drained to create a dry environment, a repair actuator is inserted into the flow channel through a manhole in the volute and moved to the cavitation erosion area on the blade surface; geometric feature data of the cavitation erosion area is collected, and a thixotropic composite repair material containing magnetic particles is prepared; the composite repair material is injected into the cavitation erosion area according to the geometric feature data, and a controllable magnetic field is applied, using the magnetic force to drive the magnetic particles to migrate, thereby making the material dense and compacted and conforming to the blade profile; the compacted composite repair material is cured, and the repair actuator is withdrawn after reaching a preset strength. This invention enables unmanned in-situ repair of cavitation erosion areas on turbine blades, significantly shortening the maintenance cycle and reducing safety risks. The magnetic field compaction technology improves the density of the repair material and the bonding strength with the matrix, effectively ensuring the repair quality.

The application provides a water turbine cavitation erosion repair method and related device, and belongs to the technical field of hydraulic machinery maintenance. When the evaluation result meets the requirements, the cavitation erosion part of the water turbine flow part is subjected to targeted replacement groove processing, and a targeted replacement groove is obtained. Based on the size of the cavitation erosion area of the water turbine flow part, a targeted replacement base plate is designed, and the surface of the targeted replacement base plate is subjected to laser cladding to obtain a laser cladding initial processing plate. According to the size of the targeted replacement groove, the laser cladding initial processing plate is processed to obtain a laser cladding targeted replacement plate. The laser cladding targeted replacement plate is welded with the replacement groove, and after the welding is completed, the part polished higher according to the water turbine streamline is polished, and the surface of the laser cladding targeted replacement plate is subjected to nondestructive testing at a set time. After the nondestructive testing is qualified, the repair of the cavitation erosion part of the water turbine flow part is completed. The application solves the problems of great implementation difficulty and low repair quality of the water turbine cavitation erosion repair.

This invention relates to an energy dissipation structure and design method for a high-head, high-flow-rate vertical shaft vortex spillway, belonging to the field of flood discharge and energy dissipation technology in water conservancy and hydropower engineering. The structure incorporates a general basic module and scenario-specific energy dissipation modules along the water flow direction. For scenarios with limited elevation differences, a transitional energy dissipation section, a stilling well section, and a turning diffusion section are used. For ultra-high flow scenarios, a sudden expansion stilling pool and a connecting pool are employed. The connections between modules are smooth transition structures. The design method includes operating condition classification, parametric modeling, numerical simulation verification, risk control, and engineering implementation. This invention is adaptable to multiple scenarios, achieving efficient graded energy dissipation and smooth flow transitions, avoiding resonance and cavitation erosion risks, and improving the operational safety and economy of the spillway.

This invention discloses a turbine-piston composite seawater desalination device in the field of energy recovery technology. The device includes a seawater treatment tank with a concentrated brine input pipe fixedly installed on one side. A turbine-piston composite structure is installed inside the concentrated brine input pipe, comprising: a turbine unit (composed of turbine assemblies symmetrically arranged on both sides of the concentrated brine input pipe, each turbine assembly containing a biomimetic blade assembly); a piston unit (located inside the concentrated brine input pipe, connected to the turbine unit via a linkage assembly); and a detection unit (capable of monitoring the concentrated brine operating conditions). This invention addresses the problems of narrow operating range, high cavitation loss, poor corrosion resistance, and low efficiency stability inherent in turbine-type energy recovery devices through the turbine-piston composite structure.

This utility model discloses a sewage pump and its coupling pipe with a coating technology for preventing sand and gravel wear and cavitation, relating to the field of pump technology. The utility model includes a pump body, inside which a stator coil is installed. A lower bearing seat is located on the top of the pump body, a machine base is located on top of the lower bearing seat, and an upper bearing seat is located on top of the machine base. This utility model significantly improves the cavitation resistance and wear resistance of the sewage pump by coating the pump body, connecting pipe, and drain pipe with a polyurethane protective layer. The polyurethane coating has excellent wear resistance and cavitation resistance properties, effectively preventing hard particles in the medium from eroding the pump body flow channel and coupling pipe under high-speed operation or high-head conditions, reducing wear on metal surfaces, extending equipment service life, and effectively resisting cavitation caused by local pressure reduction within the pump, preventing pitting and peeling of metal surfaces, ensuring stable pump operation, and improving the adaptability and reliability of the equipment under complex operating conditions.

This invention discloses a combined venting and stepped spillway system and a method for unpressurized connection. The venting consists of an upstream pressurized pipe and a downstream unpressurized open channel pipe, wherein the unpressurized open channel pipe consists of an unpressurized straight section and a curved connection section from upstream to downstream. The stepped spillway consists of an upper stepped spillway section, a curved connection section, and a lower stepped spillway section. The curved connection section is the curved connection section of the unpressurized open channel pipe, extending towards the stepped spillway and connecting with the downstream stepped spillway section, thus connecting and converging the entire venting and stepped spillway. The starting end of the curved connection section smoothly connects to the unpressurized straight section, and the ending end connects to the lower stepped spillway section. This invention can improve the flow pattern, reduce the impact load on the bottom plate of the connection section, avoid cavitation erosion, and save on engineering investment. It also provides a convenient and effective venting structure for engineering situations with poor geological conditions and limited layout of venting structures.

The application relates to the technical field of liquefied natural gas filling equipment control, and particularly discloses an intelligent impeller booster pump regulating control method and system of LNG, which discards a flow sensor, obtains active and reactive power of a motor from a frequency converter, calculates a power factor, a standard deviation and an active power response steepness to determine a high-efficiency preselected area; vibration signals of a pump body are collected, FFT transformation is carried out, sub-leaf frequency band energy is extracted, a normalized cavitation erosion index is calculated, a dynamic safety boundary is determined, a guide vane is normally locked, and only a frequency converter rotating speed is regulated to stabilize an outlet pressure; when efficiency deviates and a safety margin is sufficient, one-way fixed-step guide vane exploration is triggered; and when an upper limit is exceeded, a 2-time-step reverse rollback is executed, and a 24-hour exploration-prohibition area is set. The application does not need a flowmeter, and the frequency of guide vane action is extremely low, so that the pump can be long-term operated in a high-efficiency area near a cavitation safety boundary, operation efficiency, cavitation protection and equipment service life are considered, and the application is suitable for wide-fluctuation working conditions of LNG vehicle filling stations.

The utility model discloses a kind of steam turbine bypass valve valve core wear-resistant structures, it is related to steam turbine bypass valve technical field, including valve core, the upper part of the valve core outer ring side is provided with two upper metal seal rings, the lower part of the valve core outer ring side is provided with two lower metal seal rings, the outer side of the upper metal seal ring and the lower metal seal ring is all provided with metal ceramic coating.The utility model is provided with metal ceramic coating, upper metal seal ring and lower metal seal ring, so that between valve core and guide sleeve when opening and closing, the metal ceramic coating of the outer side of upper metal seal ring and lower metal seal ring improves wear resistance, protects upper metal seal ring and lower metal seal ring, avoids being damaged by steam cavitation erosion after abrasion, and then guarantee the sealing property of valve core.