Product Introduction
A hydraulic coupler is a mechanical device that transmits rotational speed using a liquid medium. It connects the drive input shaft end to the original driving mechanism 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, as pressure approaches infinity, the output speed equals the input speed, akin to a rigid coupling. As pressure decreases, the output speed accordingly drops. Continuously changing the medium pressure allows for variable speed control below the input speed. The power control and speed regulation principle, along with efficiency, of a hydraulic coupler are based on the aforementioned characteristics. A hydraulic coupler is a type of mechanical speed regulation device that consumes energy; the deeper the speed regulation (the lower the speed), the greater the loss. This is especially true for constant torque loads, as the input power to the original transmission remains constant, resulting in a proportional increase in loss power due to the speed loss. For loads like fans and pumps, where the load torque varies with the square of the speed, the input power to the original transmission decreases at a rate proportional to the square of the speed, resulting in relatively lower loss power. However, the output power decreases at a cubic rate 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 liquid as the working medium, also known as a hydraulic coupling.
Product Real Photos
Product Features
The impeller and turbine of a hydraulic coupling form a sealed working chamber that allows for the cyclic flow of liquid. 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 liquid is ejected by the centrifugal impeller. This high-speed liquid enters the turbine, causing it to rotate and transferring the energy obtained from the impeller to the output shaft. The liquid then returns to the impeller, creating a continuous cycle. The hydraulic coupling transmits torque by changing the momentum of the liquid interacting with the blades of the impeller and turbine. Its output torque is equal to the input torque minus the frictional 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: the ability to eliminate shock and vibration; an output speed lower than the input speed, with the speed difference between the two shafts increasing with the load; good overload protection and starting performance, allowing the input shaft to continue rotating even when the load is too great and the coupling stops, preventing damage to the power source; and when 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 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 coupling can achieve higher efficiency when the normal operating speed ratio is above 0.95. The characteristics of the hydraulic coupling vary due to the different shapes of the working chamber and the impeller and turbine. If the oil in the hydraulic coupling is drained, the coupling is disengaged, serving as a clutch.
