Product Introduction

A hydraulic coupler is a mechanical device that transmits rotational speed using a liquid medium. Its driving input shaft is connected to the original drive, while the driven output shaft is connected to the load shaft. By adjusting the pressure of the liquid medium, the rotational speed of the output shaft can be altered. In an ideal state, as pressure approaches infinity, the output speed equals the input speed, similar to a rigid coupling. As pressure decreases, the output speed correspondingly reduces; continuously changing the medium pressure allows for a stepless adjustment of the output speed below the input speed. The power control and speed regulation principle and efficiency of the hydraulic coupler are based on its aforementioned characteristics. The hydraulic coupler is a power-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 drive input power remains constant, the power loss increases proportionally with the speed loss. For loads like fans and pumps, where the load torque varies with the square of the speed, the original drive input power decreases with the square of the speed, resulting in relatively smaller power loss. However, the output power decreases with the cube of the speed, and the speed regulation efficiency remains low. The hydraulic coupler's speed regulation efficiency curve has 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 Photo

Product Features

The impeller and turbine of a hydraulic coupler form a sealed working chamber that allows for the circulation of fluid. The impeller is mounted on the input shaft, while the turbine is mounted on the output shaft. As the power source (internal combustion engine, electric motor, etc.) rotates the input shaft, the fluid is ejected by the centrifugal impeller. This high-speed fluid enters the turbine, causing it to rotate and transferring the energy obtained from the impeller to the output shaft. The fluid then returns to the impeller, creating a continuous flow. The hydraulic coupler transmits torque by changing the momentum moment through the interaction of the fluid with the blades of the impeller 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 coupler are connected by the fluid, with no rigid connections between the working components. The hydraulic coupler features the ability to 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 start-up performance, allowing the input shaft to continue rotating even when the load is too great and the machine stops, 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 coupler is equal to the ratio of the product of the output shaft speed and output torque (output power) to the product of the input shaft speed and input torque (input power). Generally, a hydraulic coupler can achieve high efficiency when the rotational speed ratio under normal operating conditions is above 0.95. The characteristics of the hydraulic coupler vary due to the shape differences of the working chamber and the impeller and turbine. If the fluid in the hydraulic coupler is drained, the coupler is disengaged, serving as a clutch.