Real-time measuring device for torque of fan

Abstract

The invention provides a real-time measuring device for torque of a fan. The real-time measuring device comprises a false shaft, a torque sensor, a shaft coupler and a plurality of mounting brackets used for supporting and fixing the parts, central axes of which are positioned on the same straight line, wherein the false shaft, the torque sensor, the shaft coupler and the mounting brackets are sequentially connected; the false shaft and the shaft coupler are coaxially connected with fan load and a motor of a to-be-measured fan separately; the fan load comprises an air inlet, an impeller and a volute casing; the air outlet is formed in the volute casing; the two ends of the false shaft are separately connected with the center position of the impeller and the torque sensor; the two ends of the shaft coupler are separately connected with the torque sensor and an output shaft of the motor; the torque sensor is electrically connected with a computer; and the motor is externally connected with a control power supply and a rotation speed change-over switch box. The measuring device is simple in structure, is convenient to use, and can be used for measuring real-time torque, under a changeable working condition, of the fan, so that proper time interval when the fan changes over between high speed and lower speed is obtained, burden and a breakage condition of the rotary shaft are reduced, and driving safety is guaranteed.

Description

technical field [0001] The invention relates to the technical field of fan torque detection, in particular to a real-time measurement device for fan torque. Background technique [0002] At present, the cooling fans used in high-speed rail and traction motors on high-speed trains basically adopt high-low speed switching control. When the vehicle is running at high speed, the fan on it is in a high-speed running state (high-speed gear). When the vehicle enters the station, in order to reduce the noise hazard, the fan needs to be switched to a low-speed running state. The usual method is: first cut off the power of the motor, so that the impeller The speed of the fan is gradually reduced, and after a period of time, the power supply of the motor (low gear) is turned on to ensure that the fan is in a low-speed operation state. [0003] If the power-off time of the motor is too short, so that after the power is turned on, the output speed of the low-speed motor cannot keep up w...

AI Technical Summary

Problems solved by technology

Since the performance test of the fan takes a long time and must be carried out under stable conditions, even the calculated torque is only the average value within a certain period of time, so it is impossible to use this method to estimate the actual torque of the fan under changing conditions. Real-time precise measurement

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