Pneumatically powered submersible fluids pump with casing activator

摘要

A pump, submerged in a fluid in a pump or well, has a buoyant outer, enclosing casing. Communicated to the casing are a conduit to supplying compressed air to the casing, a conduit for carrying the exhausted air away from the casing, an inlet and check valve for permitting entry of fluid into the casing, and an outlet and a check valve connected to discharge piping for carrying fluid away from the casing. The outer casing slides vertically relative to the discharge piping and is supported by the discharge piping for vertical movement between upper and lower stops where the casing actuates an air exhaust valve and a compressed air inlet valve. When the buoyant casing is in the upper position, air within the casing can escape through the open chamber air exhaust valve and compressed air entry is blocked to the casing through the closed compressed air inlet valve. When the casing is in the lower position, air within the casing is blocked from escape by the closed chamber air exhaust valve and compressed air entry enters the casing through the open compressed air inlet valve. Fluid to be pumped, entering and exiting the casing, changes the casing buoyancy, and this buoyancy acts with full force, opening and closing the valves to cycle the pump between the upper and lower position, causing pumping to occur.