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US 4,289,456 AGranted
Underwater pump
OwnerMasamitsu Ishiharainventor
Life of this patent
Estimating the term…
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OwnerMasamitsu Ishiharainventor
Estimating the term…
An underwater pump which comprises an engine received in liquidtightness in a capsule, and wherein the suction pipe and exhaust pipe of the engine are each open at one end on the surface of the wafer. The exhaust pipe is cooled by the surrounding water. A water-collecting chamber is formed at the lower end of the exhaust pipe to collect water drops deposited on the inner wall surface of the exhaust pipe, the collected water being drawn off to the outside. A connection pipe provided with a flow control valve communicates with a discharge water hose. Air remaining in an impeller casing or part of the discharge water pressurized by the impellers is carried into the discharge water hose through the connection pipe. Engine-cooling water is held in a water tank shut off from the surrounding discharge water. The engine-cooling water brought pack through a return path from the engine capsule is cooled by discharge water drawn into the underwater pump.
An underwater pump which comprises an engine received in a capsule in liquidtightness to drive impellers within an impeller casing when the pump body and engine capsule are immersed in water, said engine being connected to a suction pipe and exhaust pipe, each open at one end above the surface of the water, the exhaust pipe being cooled by the water and the lower end thereof being provided with a water-collecting section downwardly inclined from the horizontal direction to collect water deposited on the inner wall surface of the exhaust pipe and discharge same, water-collecting means disposed disposed between the lower end portion of the inclined water-collecting section and the impeller casing and designed forcefully to discharge water accumulated in the exhaust pipe by means of a negative pressure generated by water flowing into the impeller casing by the rotation of the impellers.
Dependencies are inferred from the claim text.