A liquid coupling or hydraulic coupling is a hydrodynamic or ‘hydrokinetic’ device used to transmit rotating mechanical power. It has been used in automobile transmissions instead of a mechanical clutch.

Liquid couplings are hydrodynamic devices that transmit rotation between shafts by acceleration and deceleration of hydraulic fluid. Shafts are used industrially to provide rotary movement to a wide spectral range of vehicles and apparatus and shaft couplings are fundamental to providing protected rigid, flexible or nonlinear connection between shafts, tires and rotary equipment.

Fluid couplings consist of a housing containing an impeller about the input or driving shaft and a runner about the output shaft. Both of these include a fluid which is generally oil that is put into the coupling through a filling plug on the housing. The impeller, which functions as a pump, and the runner, which functions as a turbine, are both bladed rotors. The parts of liquid couplings are generally made out of metallic materials-aluminum, steel or stainless. Fluid couplings are found in the automotive, railroad, aerospace, marine and mining industries. They are found in the transmissions of automobiles instead of mechanical clutches. Forklifts, cranes, pumps of most kinds, mining machinery, diesel trains, aircrafts and rotationally-powered industrial machinery all use fluid coupling when an application requires variable speed operation and a startup without shock loading the system. Manufacturers utilize these couplings to connect rotary tools such as drive shafts, line shafts, generators, wheels, pumps and turbines in a variety of automotive, oil and gas, aerospace, water and waste treatment and construction sectors.

In a fluid coupling, the impeller and rotor are both bowl-shaped and have many radial vanes. They face one another but unlike gear couplings have no mechanical interconnection and never touch. Fluid can be directed by the pump into the impeller. The driving turbine or pump is usually rotated by an interior combustion engine or electric engine imparting both linear and rotational motion to the fluid. The velocity and energy is certainly transferred to the liquid when the impeller rotates. It really is then changed into mechanical energy in the rotor. Every liquid coupling provides differing stall speeds, which may be the highest swiftness that the pump can turn when the runner can be locked and maximum insight power is used. Slipping always occurs since the input and result angular velocities are similar, and therefore the coupling cannot reach complete power efficiency-some of it will always be lost in the liquid friction and turbulence. Versatile shaft couplings such as fluid couplings are essential fluid coupling china because during procedure, some types of shafts tend to shift, causing misalignment. Flexible couplings provide efficient lodging for moderate shaft misalignment occurring when the shafts’ axes of rotation become skewed. Shaft movement is due to bumps or vibration and it results in parallel, angular or skewed shaft misalignment.
Quick release coupling (quick connect-disconnect coupling), is normally a mechanical device,that provides a fast, easy way to repeatedly connect and disconnect any liquid line.