Lubrication and cooling system for gear case

Abstract

The invention discloses a lubrication and cooling system for a gear case. The lubrication and cooling system comprises an oil pump, an oil pump motor, a cooler fan, a fan motor and a cooler; the oil inlet of the oil pump is connected with the oil outlet of the gear case; the oil pump motor and the fan motor are respectively connected with a frequency changer; speed control is performed on the oil pump motor and the fan motor by the frequency changer; the control mode of the frequency changer is a PID (proportion integration differentiation) control mode; a temperature used for detecting the temperature of an oil groove of the gear case is arranged in the oil groove of the gear case. According to the lubrication and cooling system disclosed by the invention, on the basis of temperature information fed back by the temperature sensor arranged in the oil groove of the gear case, PID automatic control is performed on the running frequency of the oil pump motor and the running frequency of the fan motor, so that the control of the running speed of the fan and the running torque of the oil pump motor is realized by the frequency changer; in the start-up process and the running process of the oil pump motor, according to the conditions of the temperature and the viscosity of lubricating oil, the oil pump motor is smoothly started, and the goal that the energy is saved under the high temperature condition is achieved.

Description

technical field [0001] The invention relates to a cooling system, in particular to a system for lubricating and cooling a gearbox in a wind turbine. Background technique [0002] In the field of wind power, the existing gearbox lubrication and cooling systems mostly use fixed-speed cooler fans to cool down the cooler, and cannot adapt the wind speed to the temperature of different environments; these cooler systems also mostly use fixed high power oil pump motor, the torque of the oil pump motor of this cooling system is fixed, the oil pump motor with the same and fixed torque is used in low temperature and high temperature conditions, if the oil pump motor torque is large, the oil pump can be started under low temperature conditions, After the motor starts, the actual required torque is smaller than that at the start. Since the torque is fixed, the oil pump motor will still use this torque when it is running, which will inevitably cause energy waste. If the torque of the oi...

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Problems solved by technology

[0002] In the field of wind power, the existing gearbox lubrication and cooling systems mostly use fixed-speed cooler fans to cool down the cooler, and cannot adapt the wind speed to the temperature of different environments; these cooler systems also mostly use fixed high power oil pump motor, the torque of the oil pump motor of this cooling system is fixed, the oil pump motor with the same and fixed torque is used in low temperature and high temperature conditions, if the oil pump motor torque is large, the oil pump can be started under low temperature conditions, After the motor starts, the actual required torque is smaller than that at the start. Since the torque is fixed, the oil pump motor will still use this torque when it is running, which will inevitably cause energy waste. If the torque of the oil pump motor is small, not only is it difficult to start in low temperature conditions, but Starting under low temperature conditions may cause damage to the motor. Therefore, this cooling system generally needs to replace the fan motor and oil pump motor under different working conditions to adaptively adjust the fan speed and oil pump torque.

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