Time : 2021-09-03 Browse : 35
Hydraulic couplings are widely used in traditional industries such as coal, steel mills, ports, cement, and thermal power plants. They are favored by manufacturers for their advantages of increasing efficiency by 30%, flexible transmission, and stepless speed regulation. Among them, the flexible transmission characteristic is the key to reducing motor losses. The specific principle is as follows:
Working Basis of Fluid Couplings
The turbine of the turbo coupling is fixedly connected to the driven wheel, the driving wheel is connected to the motor, the driven wheel is connected to the pump, the pump wheel and the turbine are connected without fixed parts, and the circular cavity between the two is the working chamber. When the working chamber is filled with working media such as oil, the driving shaft drives the pump wheel to rotate at high speed, and the pump wheel blades drive the working oil to rotate at high speed. The working oil is thrown to the outer circumference of the pump wheel under the action of inertial centrifugal force, forming a high-speed oil flow that rushes into the radial flow channel at the turbine inlet, and its dynamic torque drives the turbine to rotate.
The Realization and Function of Flexible Transmission
At the turbine outlet, the working oil enters the radial flow channel at the inlet of the pump wheel at the composite speed of the radial relative speed and the turbine outlet speed, regaining energy, and repeating this cycle. The pump wheel converts the mechanical energy of the prime mover into the kinetic energy and pressure potential energy of the working oil. The working oil entering the turbine then converts the energy into the mechanical energy of the output shaft and transmits it to the pump, thereby realizing the flexible transmission of the motor shaft power.
This flexible transmission method of "liquid connection" avoids the hard impact that may be generated in rigid transmission, greatly reduces the impact load acting on the input and output shafts of the motor and the working machine, reduces the mechanical wear and fatigue loss of the motor and the working machine, and thus extends the service life of the equipment and reduces maintenance costs.
In addition, the hydrodynamic coupling can adjust the speed by controlling the amount of working oil in the chamber of the pump wheel and the turbine blade: when the pump wheel speed is fixed, the more working oil, the greater the torque transmitted; when the driving shaft torque remains unchanged, the more working oil, the higher the turbine speed. The oil volume is controlled by the spoon tube. When the spoon tube is raised, the return oil volume increases, the oil volume in the chamber decreases, and the turbine speed decreases; otherwise, the speed increases. This stepless speed regulation capability allows the motor to operate under the best working conditions and further reduce unnecessary energy loss.
