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A Jet Pump is a type of impeller-diffuser pump that is used to draw water
from wells into residences. It can be used for both shallow (25 feet or
less) and deep wells (up to about 200 feet.) |
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Shown here is the underwater part of a deep well jet pump. Above the surface
is a standard impeller-diffuser type pump. The output of the diffuser is
split, and half to three-fourths of the water is sent back down the well
through the Pressure Pipe (shown on the right here). |
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At the end of the pressure pipe the water is accelerated through a cone-shaped
nozzle at the end of the pressure pipe, shown here within a red cutaway
section. Then the water goes through a Venturi in the Suction Pipe (the
pipe on the left). |
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The venturi has two parts: the Venturi Throat, which is the pinched section
of the suction tube; and above that is the venturi itself which is the
part where the tube widens and connects to the suction pipe. |
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The venturi speeds up the water causing a pressure drop which sucks in
more water through the intake at the very base of the unit. The water goes
up the Suction Pipe and through the impeller -- most of it for another
trip around to the venturi. |
