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Speed-Regulating Hydraulic Couplerr
Jun 29, 2017

The speed-regulating hydraulic coupler is composed of a pump wheel, a turbine and a spoon tube chamber, as shown in the following figure. When the active shaft drives the pump wheel to rotate, the working oil will gain energy and be sent to the outer circumference of the pump wheel under the action of inertia centrifugal force under the joint action of the vane and cavity in the pump wheel. High-speed oil flow, the pump wheel outside the circumference of the high-speed oil flow and the radial relative speed and pump wheel exit the circumference of the velocity composition, into the turbine inlet radial flow, and along the turbine's radial flow through the momentum of the change in the oil flow to promote the turbine rotation, The flow of oil to the turbine exit is combined with its radial relative velocity and the circumference velocity at the turbine exit, which flows into the radial flow path of the pump wheel and regain energy in the pump wheel. The repetition is so repetitive that it forms the circulating flow circle of the working oil in the pump wheel and the turbine. Thus, the pump wheel converts the input mechanical work into the kinetic energy of the oil, while the turbine converts the kinetic energy of the oil into the mechanical work of the output, thus realizing the transmission of the power.

The stepless speed change of the speed-regulating hydraulic coupler is realized by changing the position of the scoop tube and changing the working oil quantity in the circle. When the spoon tube is inserted at the deepest of the liquid coupling chamber, the minimum oil quantity in circular circle, large deviation of pump wheel and turbine rotational speed and the lowest output speed; When spoon tube is inserted in the most shallow place of liquid coupling chamber, the maximum oil content in circular circle, the deviation of pump wheel and turbine rotational speed is small, the output speed is greatest.

There is a certain difference between the pump wheel and the turbine speed of the speed-governing hydraulic coupler, which is called velocity slip. By the properties of viscous fluids, the slip loss of coupler and friction loss of bearing will generate a lot of heat and be absorbed by the coupler working oil. The larger the slip difference of coupler, the greater the transfer power, the greater the heat generated. In order to make the coupling oil temperature does not exceed the specified value, must use the oil circulation system to bring the high-temperature oil out, after cooling oil cooler back into the coupler, thus ensuring the balance of heat in the hydraulic coupler. The oil cooling modes of different hydraulic couplers are different, which is also an important problem in the application process of hydraulic coupler.