Product Introduction

A hydraulic coupler is a mechanical device that transmits rotational speed using a liquid medium. It connects the driven input shaft to the original driving mechanism and the driven output shaft to the load shaft. By adjusting the pressure of the liquid medium, the rotational speed of the output shaft can be altered. Ideally, as the pressure approaches infinity, the output speed equals the input speed, similar to a rigid coupling. As 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 for hydraulic couplings, as well as their efficiency, is based on the aforementioned characteristics. A hydraulic coupler is a power-consuming mechanical speed regulating 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, where 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 less loss power. However, the output power decreases with the cube of the speed, and the speed regulation efficiency remains low. The speed regulation efficiency curve of a 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 Real Photos

Product Features

The impeller and turbine of a hydraulic coupler form a sealed working chamber that allows for the circulation of liquid. The impeller 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 impeller. This high-speed fluid, upon entering the turbine, drives it to rotate, transferring the energy obtained from the impeller to the output shaft. The liquid then returns to the impeller, creating a continuous cycle. The hydraulic coupler transmits torque by changing the momentum of the liquid in interaction with the blades of the impeller and turbine. Its output torque is equal to the input torque minus the frictional torque, hence its output torque is always less than the input torque. The input and output shafts of the hydraulic coupler are connected by the liquid, and there is no rigid connection between the working components. The characteristics of the hydraulic coupler 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, allowing the input shaft to continue rotating even when the load is too great to prevent damage to the power source; when 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 output shaft speed multiplied by the output torque (output power) to the input shaft speed multiplied by the input torque (input power). Generally, when the rotational speed ratio is above 0.95 under normal operating conditions, a higher efficiency can be achieved. The characteristics of the hydraulic coupler vary due to the different shapes 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.