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Product Details
Introduction to Speed-Regulating Hydraulic Couplings
- 1. Working Principle of Speed-Regulating Hydraulic Couplings
The YOTc speed-regulating hydraulic coupling developed and manufactured by our company is an export-regulated, speed-adjustable hydraulic coupling. Its structure consists of five main components:①. Rotating components: The main components include the driving element (pump impeller, housing, input shaft) and the driven element (turbine, output shaft).
The working cavity of the YOTc series speed-regulating hydraulic coupler is filled with a certain amount of working fluid (typically No. 32 turbine oil). The rotating part, which serves as the driving element, is connected to the electric motor. The pump impeller receives mechanical energy from the electric motor and, through its blades, sets the working fluid into relative motion and entrainment motion, thereby converting it into liquid energy that drives the turbine to rotate. The turbine is connected via the output shaft to the driven machine, where the liquid energy is transformed back into mechanical energy, driving the driven machine to perform its work. This process realizes the transmission of energy from the prime mover to the driven machine.
②. Oil inlet and outlet system;
③. Fuel tank;
④. Cooling system;
⑤. Instruments and control systems.
The speed-regulating fluid coupling enables stepless speed adjustment of the driven machine by regulating the opening degree of the oil-discharge system’s conduit, thereby changing the filling volume of the working cavity. Under constant motor speed, this allows for stepless speed control of the driven machine, thus adjusting the magnitude of the output power. During the speed-regulating process, slip occurs (with the maximum relative efficiency loss occurring at a transmission ratio of i=0.66, where η=97%); the working fluid will heat up, so it is essential to equip the coupling with a cooler to cool the working fluid before it is returned to the working cavity via the oil supply system. The fluid coupling can be controlled remotely or manually on-site through various control instruments such as electric actuators, servo amplifiers, automatic speed-measuring devices, speed sensors, and pressure sensors, enabling automated operation of the speed-regulating fluid coupling.2. Advantages of speed-regulating hydraulic couplings
◆ To enhance the starting capability of squirrel-cage induction motors, we can utilize the motor’s peak torque as the starting torque, thereby avoiding the unreasonable mismatch phenomenon of “using a large horse to pull a small cart.”
◆ Prevent power overload and protect the motor and working machinery from damage due to overload.
◆ Reduce vibration and impact during the starting process.
◆ In multi-motor drives, power balance and sequential starting can be achieved, reducing inrush currents on the power grid.
◆ The start-up time of the working machine can be fully adjusted according to operational requirements.
◆ The working machine features stepless speed regulation, delivering remarkably significant energy-saving effects with a savings rate ranging from 20% to 40%.
◆ The working machine can be remotely controlled and automated, making operation extremely convenient.
◆ It features a simple and reliable structure, is less expensive than variable-frequency drives and CST speed controllers, incurs lower operating costs, has no mechanical wear, can operate in harsh environments, requires no special maintenance, and boasts a long service life.
3. Application Scope
Among the equipment operating in the mechanical industry, some are speed-regulated to save energy, while others are speed-regulated due to process requirements. Therefore, speed-regulating couplings have an extremely wide range of applications.
◆ Pump types: boiler feedwater pumps, ash and slag pumps, transfer pumps, condensate pumps, water supply pumps, etc.;
◆ Fan types: blowers, induced draft fans, Roots blowers, etc.;
◆ Others: crushers, centrifuges, wastewater treatment odor control units, belt conveyors, grab dredgers for sand-dredging vessels, sintering mixers, and more.
4. Power Transmission Characteristic Diagram for YOTc Series Speed-Regulating Hydraulic Couplings
5. The original characteristic curve λB—f(i) of the YOTc series speed-regulating hydraulic coupler, combined with the operating curves of the driven machinery under different operating conditions.Customer Notice: The auxiliary components and instrument-related items that must be specified when the customer places an order.
Note:
1. The items marked with ● above must be provided and confirmed by the customer when signing the contract.
2. The direction of rotation is determined by the rotational direction of the coupling input end when viewed from the rear end of the motor.
3, Unless the user has specific requirements, the electric actuator is installed on the right side of the coupling’s output end (when standing behind the motor and looking toward the coupling).6. Supporting Components Supply Project
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