11 results about "Kaplan turbine" patented technology

The utility model discloses an axial flow Kaplan turbine which comprises a runner hub, a plurality of rotating shafts, a plurality of blades, a first driving mechanism and a second driving mechanism, each rotating shaft is arranged around the runner hub, each rotating shaft is of a telescopic structure, and one end of each rotating shaft is rotationally connected with the runner hub; each blade is arranged on the side of the runner hub in the circumferential direction and fixedly connected with one end of the corresponding rotating shaft. The first driving mechanism is connected with the rotating shafts and used for driving the rotating shafts to rotate synchronously so as to adjust the inclination angles of the blades. The water turbine has the advantages that the second driving mechanism can drive the rotating shafts to extend synchronously, so that the distance between each blade and the runner hub is increased, the horizontal distance between each blade and water flow is reduced, when the water flow is small, most of the water flow can fall on the blades, and the power generation efficiency of the water turbine is improved.

The invention discloses a high-precision modeling method for an axial-flow Kaplan turbine based on a seagull optimization algorithm and a BP (Back Propagation) neural network. The high-precision modeling method comprises the following steps: acquiring basic modeling data of the axial-flow Kaplan turbine; the opening degree characteristic and efficiency characteristic data of the axial-flow Kaplan turbine are supplemented; constructing a flow characteristic and torque characteristic data set of the axial-flow Kaplan turbine; correcting the guide vane opening degree in the flow characteristic and torque characteristic data set of the axial flow Kaplan turbine; constructing a guide vane and paddle joint characteristic model based on a seagull optimization algorithm and a BP neural network; and in combination with the corrected data set, the BP neural network and a seagull optimization algorithm, reconstructing a flow characteristic and torque characteristic neural network model of the axial-flow Kaplan turbine. According to the axial-flow movable propeller water turbine modeling method considering the modeling data quality and the guide vane and paddle joint characteristics, a high-precision and nonlinear axial-flow movable propeller water turbine model can be obtained, and a model basis is provided for axial-flow movable propeller water turbine unit control strategy research.

The invention discloses a water-lubricated vertical shaft Kaplan turbine runner which comprises a runner body, a water-lubricated vertical shaft Kaplan turbine runner, a water-lubricated vertical shaft Kaplan turbine runner and a water-lubricated vertical shaft Kaplan turbine runner, the paddles are rotationally arranged on the runner hub; the servomotor comprises a piston rod slidably arranged in the runner hub and a high-pressure oil cylinder arranged at the lower end of the runner hub, and a piston matched with the high-pressure oil cylinder is arranged at the lower end of the piston rod; the piston rod is connected with the paddle through the connecting rod mechanism, high-pressure oil in the high-pressure oil cylinder body provides power for the piston rod, and therefore the opening degree of the paddle is adjusted. According to the scheme, the oil pollution problem of the water turbine is greatly avoided; the structural stability of the paddle is improved, and the risk of paddle sealing failure is reduced; the structure of parts of the rotating wheel is optimized, machining steps are reduced, machining cost is reduced, welding points of the parts are reduced, the overall sealing effect of the rotating wheel is improved, oil leakage points are reduced, and machining efficiency and production quality are greatly improved.

The invention discloses a rotating wheel oil isolation structure of a Kaplan turbine, and relates to the field of reaction hydraulic machinery, the rotating wheel oil isolation structure comprises a main shaft and a hub, the inner side of the main shaft is provided with an operation oil pipe, the center of the main shaft is provided with a piston rod extending into the hub, the hub is internally provided with a piston cavity and an oil-free cavity, and the piston cavity and the oil-free cavity are communicated with each other. Breathing channels are arranged in the main shaft and the hub, and the piston rod is sleeved with a flexible telescopic joint which is fixedly connected with the hub and the piston rod. One end of the flexible expansion joint is fixed to the hub, the other end of the flexible expansion joint is fixed to the piston rod, the flexible expansion joint does not generate contact friction when moving between the piston rod and the hub, the installation position belongs to static sealing, stability and reliability are higher, and leakage of hydraulic oil can be effectively prevented. The hub oil-free cavity is communicated with the atmosphere through the main shaft and a breathing channel in the hub, so that the pressure of the hub oil-free cavity is lower than that of a flow channel, and pollution caused by leakage of contents in the hub is further avoided.

The utility model relates to a Kaplan runner structure and an axial-flow Kaplan turbine. The rotating paddle type runner structure comprises a runner cone, a runner hub, a plurality of runner blades, a servomotor assembly and a plurality of operating mechanisms. The servomotor assembly is arranged below the rotating wheel body, and the operating mechanism is arranged on the upper portion in the rotating wheel body, so that the number of times of turning over in the rotating paddle type rotating wheel structure assembling process can be reduced, the assembling manufacturability is optimized, and the assembling safety is improved. The runner hub is not used as a servomotor cylinder any more, so that positions needing precision matching on the runner hub are reduced, the casting manufacturability and the yield of the runner hub are improved, the casting cost of the runner hub is reduced, the machining technological process of the runner hub is reduced, the production and manufacturing period is shortened, and the production cost is reduced. When the servomotor cylinder is abraded, the rotating wheel body does not need to be maintained, the maintenance process of the servomotor cylinder is simplified, the maintenance work of the rotating paddle type rotating wheel structure is simplified, the maintenance cost is reduced, the maintenance cost is shortened, and the maintenance efficiency is higher.

This application discloses an apparatus and method for manufacturing Cabran-type turbine blades using electroslag casting, belonging to the field of electroslag casting. A free electrode is disposed in the flange area (including the transition area) and arranged between the guide electrodes of a flexible electrode casting system. The cross-sectional profile of the free electrode is adapted to the cavity of the flange area. The free electrode is held in place by a clamping mechanism to maintain its position or move vertically. For the electroslag casting process of turbine blades with a composite cross-section of "blade + flange," this application solves the problems of electrode transition and consumable electrode design in electroslag casting by introducing a dedicated free electrode for the flange area and coordinating with the flexible electrode casting system for partitioned filling. This enables the manufacture of Cabran-type (through-flow and axial-flow) turbine blade castings, i.e., castings with three-dimensional curved surfaces and large cross-sectional area variations, using electroslag casting, thus expanding the application scope of electroslag casting.

The invention discloses a connecting device for a high-oil-pressure oil head and a Kaplan turbine, and relates to the technical field of water turbines and related equipment thereof. One end of the oil head is connected with a large shaft of a generator, and a first connecting oil pipe and a second connecting oil pipe are arranged in the oil head; a circle of oil grooves are formed in the first connecting oil pipe and the second connecting oil pipe and communicated with the internal pipeline, the outer portions of the first connecting oil pipe and the second connecting oil pipe are connected with a rotary connector, and an oil tank is arranged at the top of the oil head. The connecting device of the high-oil-pressure oil head and the Kaplan turbine is good in sealing effect. The connecting device of the high-oil-pressure oil head and the Kaplan turbine is high in oil pressure.

The present invention belongs to the field of hydraulic turbines, and provides a blade angle linkage mechanism for an axial flow Kaplan turbine, including a runner body, on which a plurality of blade assemblies are installed, and the plurality of blade assemblies are evenly distributed around the axis of the runner body. The mechanism further includes: a linkage mechanism installed inside the runner body, and a plurality of output ends of the linkage mechanism are in transmission connection with one ends of the plurality of blade assemblies, and the linkage mechanism is used to drive the plurality of blade assemblies to rotate synchronously and in the same direction. In the present invention, by means of the outer adjusting rod and the inner adjusting rod, the linear motion of the piston in the prior art is decomposed into a number of cyclic linear motions, so that the driving force required for each step is greatly reduced, making it easier to drive the outer adjusting rod and the inner adjusting rod. Moreover, each time the adjusting mechanism makes a cycle, the blade will be changed by a small angle, thus enabling more precise adjustment of the blade angle.

The invention discloses an axial-flow Kaplan turbine stress and fatigue failure rapid prediction method, which comprises the following steps: S1, extracting torque data of blades of a turbine through CFD, performing VMD decomposition and main mode selection on the torque data, and screening main modes; s2, inputting the main mode into the GMM, extracting an amplitude, a frequency and a phase, and synthesizing and reconstructing torque data according to the amplitude, the frequency and the phase; s3, inputting the reconstructed torque data into the LSTM network, outputting the stress of the blade and the rotating arm, taking the reconstructed torque data as an FSI load boundary condition, and calculating the stress of a component in combination with an ROM; and S4, predicting fatigue damage through a paris formula and a Miner criterion according to the calculated stress. Through the VMD decomposition and parameterization reconstruction technology, the data volume is reduced by more than 50% while the torque main mode physical significance is reserved, the main mode energy retention rate exceeds 95%, and the signal processing efficiency is remarkably improved.

The invention relates to the technical field of water turbine blades, and discloses an anti-crack Kaplan water turbine blade which comprises a blade body and a stress reduction transition body connecting the blade body and a hub body, and the size parameter of the stress reduction transition body is determined based on the diameter D1 of a runner: the equal height value d1 of a pressure side space fillet and the radius value R1 of the pressure side fillet are 0.02 D1 to 0.03 D1, d1 and R1 are not less than 100mm; the equal height value d2 of the space fillet of the negative pressure side and the radius value R2 of the fillet of the negative pressure side are 0.015 D1 to 0.02 D1, and the d2 and the R2 are not smaller than 75 mm. Cracks at the joints of the blades and the hub are avoided, the bearing capacity of the roots of the blades is enhanced, and the problems of root cracks and vibration under the hydraulic action are effectively solved.

The present invention discloses a guide vane opening detection method and system for an axial flow Kaplan turbine generator set, belonging to the technical field of hydrogenerator detection. First, the first guide vane opening value and the second guide vane opening value are respectively detected and compared with a preset difference threshold value. When the comparison result has a large error, the third guide vane opening value is detected for verification. The present invention ensures the detection accuracy of the guide vane opening, effectively solves the technical problem of large measurement error existing in the prior art, and ensures the safe and stable operation of the hydrogenerator set. At the same time, the system is simply constructed, has a high degree of automation, and can avoid the influence of the detection result caused by the damage or failure of individual electronic displacement sensors.