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Constant Filling Fluid Coupling

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YOX650 Hydraulic Fluid Coupling

YOX650 Hydraulic Fluid Coupling

Both ordinary type and moment limiting type hydraulic couplers need to be filled with a certain amount of working liquid before operation. According to the demand of operating power, the filling rate can be selected in the range of 40% ~ 90%. This is because the transfer capacity is too small to...

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Product Details

Both ordinary type and moment limiting type hydraulic couplers need to be filled with a certain amount of working liquid before operation.

According to the demand of operating power, the filling rate can be selected in the range of 40% ~ 90%.

This is because the transfer capacity is too small to be economical when the wide liquid rate is less than 40%;

When the liquid filling rate is greater than 90%, the fluid coupling characteristics are affected by the lack of sufficient space in the working chamber to change the flow state of the liquid supply.

If the cavity is fully filled with liquid, the thermal expansion of the liquid will cause sealing failure or structural damage.

In the case of partial liquid filling, two basic flow forms, namely small circulation flow and large circulation flow, will appear in operation under different conditions.


Pulmonary circulation flow in the rotating speed difference is small, the liquid in the working chamber of the circulation flow rate is low, the centripetal movement of the liquid in a turbine under the effect of turbine rotating centrifugal force, the work has not yet reached the circular circle around the parts came into the pump wheel, liquid can be obtained through the pump wheel can continue to release the liquid into the turbine can be later, so repeated cycle.

There is a small closed boundary between centripetal and centrifugal flow streams in circulating liquid.


As the rotating centrifugal force of the turbine decreases with the increase of rotating speed difference, the centripetal flow of the liquid flow in the turbine gradually strengthens. When the rotating speed difference reaches a certain value, the small circulation flow suddenly changes into the large circulation flow. The liquid flow of the large circulation flow moves along the outer edge of the circulation circle of the working chamber, forming an air filled cavity in the center.

When the flow changes from small circulation to large circulation, the inlet radius of the average flow line in the pump wheel decreases and the transfer torque increases.

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