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Model And Working Principle Of Hydraulic Coupling
Sep 18, 2017


The hydraulic coupling is a mechanical equipment that uses the liquid medium to transmit the rotational speed. The active input shaft end is connected with the original drive, and the driven output shaft end is connected with the load shaft end. By adjusting the pressure of the liquid medium, The speed is changed. Ideally, when the pressure tends to infinity, the output speed is equal to the input speed, which is equivalent to the steel coupling. When the pressure is reduced, the output speed is reduced accordingly, continuously changing the medium pressure, the output speed can be less than the input speed of the stepless adjustment. Hydraulic coupling speed control principle and efficiency According to the hydraulic coupling of the above characteristics, can be equivalent to the model shown in Figure 1.

The principle of power control speed control shows that the change of transmission speed is essentially the result of mechanical power regulation. So the hydraulic coupling output speed reduction, the actual output power is reduced. In the speed control process, the original coupling speed of the hydraulic coupling device does not change, assuming that the load torque unchanged, the original transmission of the mechanical power is also the same, then the input power difference between the output power there, obviously Was lost by the hydraulic coupling in the form of heat. Therefore, we can not simply think that the hydraulic coupling speed is "lost", but the actual loss of power. Set the original drive power PM1, the output power of PM2.

Hydraulic coupling is a kind of energy-saving mechanical speed control device, the deeper the speed (the lower the speed) the greater the loss, especially the constant torque load, the original drive input power unchanged, the loss of power will lose Increased proportion. For the fan pump load, due to the load torque by the speed square rate change, the original drive input power is reduced by the square of the speed, the loss of power is relatively small, but the output power is reduced by the cube speed, speed efficiency is still Very low The efficiency of the hydraulic coupling speed curve shown in Figure 2, the average efficiency of about 50%.

A non-rigid coupling, also known as a hydraulic coupling, with a liquid working medium. The hydraulic coupling (see figure) of the pump wheel and the turbine form a closed working chamber that allows the liquid to circulate. The pump wheel is mounted on the input shaft and the turbine is mounted on the output shaft. Power (internal combustion engine, motor, etc.) to drive the input shaft rotation, the liquid was centrifugal pump wheel thrown out. This high-speed liquid enters the turbine and then drives the turbine to rotate, passing the energy from the pump wheel to the output shaft. The final liquid returns to the pump wheel, forming a cycle of flow. The fluid coupling interacts with the pump wheel and the blade of the turbine to produce a change in momentum moments to impart torque. Its output torque is equal to the input torque minus the friction torque, so its output torque is always less than the input torque. The hydraulic coupling is connected with the output shaft and the output shaft, and there is no rigid connection between the working members. The performance of the hydraulic coupling is: to eliminate the impact and vibration; output speed is lower than the input speed, the difference between the two shaft speed increases with the load increases; overload protection performance and start performance, the load is too large and stop input The shaft can still be rotated without causing damage to the power machine; when the load is reduced, the output shaft speed increases until it is close to the input shaft speed. The transmission efficiency of the hydraulic coupling is equal to the output shaft speed multiplied by the output torque (output power) and the input shaft speed multiplied by the input torque (input power) ratio. General hydraulic coupling normal operating speed ratio of 0.95 or more can get a higher efficiency. The characteristics of the hydraulic coupling are different due to the difference between the working chamber and the pump wheel and the turbine. If the hydraulic coupling of the oil vent, the coupling is in the disengaged state, can play the role of clutch.