1. Fully Submerged Jet Pump
- A jet pump’s impeller and inlet can be fully underwater.
- Often used in RC boats, small submarines, or pump systems where the pump is submerged in a tank or body of water.
- The motor itself may or may not be underwater depending on design:
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Waterproof motor / sealed housing: Required if the motor is submerged.
- Above-water motor: Only the impeller/water intake is submerged (common in shallow-water RC boats).
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Waterproof motor / sealed housing: Required if the motor is submerged.
Definition
A jet pump is a type of pump that uses a high-speed jet of fluid (usually water or steam) to entrain and move another fluid.
It has no moving parts in the pumping chamber itself; the energy comes from a motive fluid.
How It Works
- A high-pressure fluid (motive fluid) is ejected through a nozzle, creating a high-velocity jet.
- The jet creates a low-pressure zone (suction) that draws in the surrounding fluid.
- The mixed fluid enters a diffuser or mixing chamber where velocity is converted into pressure.
- The combined fluid exits the pump at a higher flow rate.
Diagram Concept (simplified):
Motive fluid → Nozzle → Suction fluid drawn in → Mixing chamber → Outlet
Features
- No moving parts in the main pump (simple and reliable).
- Can pump liquids, gases, or even slurries.
- Can lift water from deep wells or create suction in fluid systems.
Applications
- Water wells (deep well jet pumps)
- Marine bilge pumping
- Boiler feed systems
- Chemical and industrial processes
