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Balance Chamber Sand Evacuation

IP.com Disclosure Number: IPCOM000237694D
Publication Date: 2014-Jul-02
Document File: 5 page(s) / 97K

Publishing Venue

The IP.com Prior Art Database

Abstract

Axial thrust forces are generated by a centrifugal pump in the creation of lift. A “down thrust” is generated by the created pressure acting across the sealed diameter of the entrance (eye) of the impeller. It acts to press the impeller towards fluid the entrance of the pump. An ‘up thrust” is generated by the momentum change in the fluid as it is turned from axial movement to radial movement in the impeller and attempts to push the impeller upward. To reduce the magnitude of the down thrust, it is sometimes necessary employ a balance chamber. This cylindrical chamber or “drum” is coaxial with the impeller and located on the top side of the upper shroud. The chambers outer diameter forms a running seal with the inside diameter of a stationary cylinder fixed to the diffuser body. This sealed chamber is vented to the impeller eye by a series of axial positioned holes through the upper shroud of the impeller. An operational problem with this approach is that sand entrained in the fluid has enough momentum to enter the chamber through the axial vent holes rather than make the turn to the radial vane passages with the fluid. Once sand is in the chamber, the centrifugal force prevents the particles from exiting through the vent holes. The sand is trapped. It will attempt to grind its way out through the running seal on the outside diameter of the chamber, reducing the systems effectiveness. This invention describes several methods to guide/force the sand back to the chamber vent holes to exit back to the impeller eye.

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Balance Chamber Sand Evacuation

Axial thrust forces are generated by a centrifugal pump in the creation of lift. A “down thrust” is generated by the created pressure acting across the sealed diameter of the entrance (eye) of the impeller. It acts to press the impeller towards fluid the entrance of the pump. An ‘up thrust” is generated by the momentum change in the fluid as it is turned from axial movement to radial movement in the impeller and attempts to push the impeller upward. To reduce the magnitude of the down thrust, it is sometimes necessary employ a balance chamber. This cylindrical chamber or “drum” is coaxial with the impeller and located on the top side of the upper shroud. The chambers outer diameter forms a running seal with the inside diameter of a stationary cylinder fixed to the diffuser body. This sealed chamber is vented to the impeller eye by a series of axial positioned holes through the upper shroud of the impeller. An operational problem with this approach is that sand entrained in the fluid has enough momentum to enter the chamber through the axial vent holes rather than make the turn to the radial vane passages with the fluid. Once sand is in the chamber, the centrifugal force prevents the particles from exiting through the vent holes. The sand is trapped. It will attempt to grind its way out through the running seal on the outside diameter of the chamber, reducing the systems effectiveness. This invention describes several methods to gui...