The structure and working principle of the coupling

　　(1) The composition of the coupling
　　It is mainly composed of pump wheel, turbine, rear auxiliary chamber, shaft sleeve, belt coupling, shell and fusible alloy protective plug.
　　(2) The working principle of the coupling
　　Part of the coupling is filled with working fluid.When the pump wheel is driven by the prime mover to rotate, the working fluid is driven by the pump wheel blades.Under the action of centrifugal force, the working fluid flows to the turbine along the curved surface of the working cavity of the pump wheel. At the same time, tangential force is generated.When the working fluid in the pump wheel flows into the turbine cavity, the turbine blades are pushed due to the tangential force, so that the turbine obtains torque.At the beginning, the torque received on the turbine is not enough to overcome the work load, so it does not rotate with the pump wheel.As the speed of the pump wheel increases, the oil entering the working chamber increases, and the force acting on the turbine and the torque produced are getting bigger and bigger.When the torque is sufficient to overcome the operation load, the turbine starts to rotate and drives the conveyor to run through the reducer.The slip of the coupling under the rated torque is 3%~5%.That is, the efficiency of the coupling is 97% to 95%.When the discovery conveyor is overloaded, the load on the turbine will increase, the speed of the turbine will decrease, and the circulation will increase, creating a negative pressure at the annular gap between the turbine and the inner edge of the pump wheel and reducing the pressure in the rear auxiliary chamber.Therefore, the oil flows back into the rear auxiliary chamber through the small holes on the pump wheel, which reduces the transmission torque at low speeds and achieves the purpose of overload protection.