Mechanical seal turntable backlash flow-

Mechanical seal turntable backlash flow

　2017-03-02　　

Backlash flow of mechanical seal turntable

The liquid is in the turntable (such as centrifugal-impeller seal) and the box (such as the shaft seal box). When the turntable rotates, the flow of liquid in the side clearance of the turntable is very complicated. The reasons are: the surface of the side wall of the turntable and the box body The inner surface of the side wall rubs against the liquid; the mechanical seal ring (impeller> leakage causes flow, etc.). Due to friction, the liquid particles on the surface of the turntable rotate with it and move away from the axis under the action of centrifugal force. According to the continuity theorem, the liquid The particles flow in the box body along the wall surface to the axis. It is this vortex flow and the flow caused by leakage that constitute the flow of liquid in the gap between the side wall of the box and the side wall of the turntable.

According to the quantitative moment of momentum and the liquid continuity equation, two extreme cases (at the impeller of the centrifugal pump and the door ring of the pump body) can be obtained for the velocity distribution in the box.　　316.html,

The orifice of the mechanical seal and the outflow from the gap 　　 The impact of the leakage of the mechanical seal on the operation