Product Introduction

A hydraulic coupler is a mechanical device that uses a liquid medium to transmit rotational speed. It connects the driving input shaft end to the original driving machine and the driven output shaft end to the load shaft end. By adjusting the pressure of the liquid medium, the rotational speed of the output shaft can be changed. Ideally, when the pressure approaches infinity, the output speed equals the input speed, similar to a rigid coupling. As the pressure decreases, the output speed correspondingly drops. Continuously changing the medium pressure allows for a stepless adjustment of the output speed below the input speed. The principle of power control and speed regulation, as well as the efficiency, of the hydraulic coupler is based on the aforementioned characteristics. The hydraulic coupler is a type of energy-consuming mechanical speed regulation device. The deeper the speed regulation (the lower the speed), the greater the loss, especially for constant torque loads. Since the original driving input power remains constant, the loss power increases proportionally with the speed loss. For loads like fans and pumps, as the load torque varies with the square of the speed, the original driving input power decreases with the square of the speed, resulting in relatively smaller loss power. However, the output power decreases with the cube of the speed, so the speed regulation efficiency is still very low. The speed regulation efficiency curve of the hydraulic coupler shows an average efficiency of around 50%. A non-rigid coupling that uses a liquid as the working medium, also known as a hydraulic coupling.

Product Actual Photos

Product Features

The pump wheel and turbine of a hydraulic coupling form a sealed working chamber that allows for the circulation of liquid flow. The pump wheel is mounted on the input shaft, while the turbine is mounted on the output shaft. As the power source (such as an internal combustion engine or electric motor) rotates the input shaft, the liquid is ejected by the centrifugal pump wheel. This high-speed liquid enters the turbine, causing it to rotate and transferring the energy obtained from the pump wheel to the output shaft. The liquid then returns to the pump wheel, creating a continuous cycle. The hydraulic coupling transmits torque by changing the momentum moment through the interaction between the liquid and the blades of the pump wheel and turbine. Its output torque is equal to the input torque minus the friction torque, thus its output torque is always less than the input torque. The input and output shafts of the hydraulic coupling are connected by the liquid, with no rigid connections between the working components. The features of the hydraulic coupling include: it can eliminate shock and vibration; the output speed is lower than the input speed, and the speed difference between the two shafts increases with the load; it has good overload protection and starting performance; when the load is too high and the rotation stops, the input shaft can still rotate, preventing damage to the power source; as the load decreases, the output shaft speed increases until it approaches the input shaft speed. The transmission efficiency of the hydraulic coupling is equal to the ratio of the output shaft speed multiplied by the output torque (output power) to the input shaft speed multiplied by the input torque (input power). Generally, a hydraulic coupling can achieve higher efficiency when the speed ratio under normal operating conditions is above 0.95. The characteristics of the hydraulic coupling vary due to the different shapes of the working chamber and the pump wheel and turbine. If the oil in the hydraulic coupling is drained, the coupling is disengaged, serving as a clutch.