Low-speed-ratio hydraulic torque converter and guide blade regulating method

Abstract

The invention provides a low-speed-ratio hydraulic torque converter and a guide blade regulating method. The low-speed-ratio hydraulic torque converter comprises a casing, a pump wheel, a secondary guide wheel, a secondary turbine, a primary guide wheel and a primary turbine, wherein the pump wheel is arranged on a pump wheel torque input shaft, the primary turbine and the secondary turbine are directly connected onto one common turbine torque output shaft, the primary guide wheel is fixedly arranged on the casing arranged between the primary turbine and the secondary turbine, the secondary guide wheel is positioned between the pump wheel and the secondary turbine, blades of the secondary guide wheel are adjustable blades connected with a guide blade regulating mechanism, and work liquid enters the primary turbine from the pump wheel in the casing, and then enters the pump wheel from through the primary guide wheel, the secondary turbine and the secondary guide wheel to form liquid flow circulation. The low-speed-ratio hydraulic torque converter is mainly used in a wind power generating mechanical transmission system, only transmits a small part of input power, can realize the turbine rotating speed regulation in a wider range, and can ensure the constant input rotating speed of a power generator. The size is small, the weight is light, the cost is low, and the reliable work in severe environment can be realized.

Description

technical field [0001] The invention relates to a hydraulic torque converter, especially a hydraulic transmission device with low speed ratio and high efficiency suitable for large-scale wind power generation systems. Background technique [0002] The transmission device is the key component system of the wind power generation device and the hub connecting the wind turbine and the generator. In order to keep the input speed of the generator constant and quickly respond to the change of wind speed acting on the wind turbine, the transmission device is required to have the ability to automatically adjust the speed, and through a suitable transmission design, the input speed of the generator is basically constant. [0003] At present, the speed control devices used for wind power generation at home and abroad include doubly-fed generators and direct-drive permanent magnet generator sets. The doubly-fed generator system provides power to the generator through the converter accor...

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Problems solved by technology

[0003] At present, the speed control devices used for wind power generation at home and abroad include doubly-fed generators and direct-drive permanent magnet generator sets. The doubly-fed generator system provides power to the generator through the converter according to the speed change of the wind turbine and the requirements of the grid voltage frequency. The rotor sends the excitation current corresponding to the slip frequency, so that the voltage frequency from the stator winding is the same as that of the grid. This scheme is currently a common scheme for realizing variable speed and constant frequency. It has been developed rapidly in developed countries such as Europe and the United States. High-frequency wind turbines have been put into use, but their overall efficiency is not high, the mean time between failures is short, the cost is high, the weight is large, and the frequency is unstable; the direct-drive permanent magnet generator uses a frequency converter to drive the wind turbine The alternating current with variable frequency is converted into a voltage with the same amplitude and phase as the grid frequency and then sent to the grid. This scheme has a simple structure, high system reliability, and can solve the problem of frequency instability. With the enlargement of wind turbines, the quality and volume of inverters are getting bigger and bigger

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