When a
centrifugal water pump is blocked by waste, it is necessary to pull the pump up
in order to sort it, which is very inconvenient and therefore rarely used in
practical activities. Therefore, using a submerged pump to carry out low-level
transportation solves the problem of low-level transportation.
However, due
to the use of a short shaft and the uneven axial force of the centrifugal
impeller, all shafts are of a suspended wall structure, resulting in significant
stiffness at the end of the centrifugal impeller during flipping. The longer the
axis, the greater the stiffness. In order to solve this problem, the equipment
on the shaft has bearings. However, because the whole shaft is a Flexible shaft,
the bearing continues to suffer from unilateral damage, with a high wear rate,
strong bearing shaking, and accelerated damage rate. Therefore, the underwater
pump has a high frequency of damage. And the shaft is not suitable for making
too long, usually within 2 meters. The bearings of the submerged pump are cooled
and polished by water using the medium transported by the pump. If the medium of
underwater concrete does not freeze and clean the bearings (such incidents can
occur when the pump is empty and the inlet is blocked by dirt), it will cause
burning of the tiles or even the motor.
The repair equipment of the submerged
pump is very laborious. When transporting corrosive media, it is impossible to
complete without lifting items. When a centrifugal water pump is transporting
liquid, when the liquid level gauge is less than, it is required to fill the
pump in order to produce water. Therefore, it is necessary to install a water
pump bottom valve at the pump inlet. Over time, if the bottom valve of the water
pump is corroded or stuck, exchange or repair is required, making the
application inconvenient. Submersible pumps are generally used to transport cold
water and rivers, but when used to transport corrosive liquids such as strong
acids and alkalis, they are prone to motor erosion and power loss, making them
very unsafe. After all, the submerged pump solves the problem of low level
transportation, but it also incurs many difficulties in applications. The column
type self priming pump is designed specifically for the transportation of low
level liquids due to the aforementioned defects of the submerged pump. It can
replace a long axis underwater pump on the road, with a naturally aspirated
aspect ratio of up to 8 meters. It can be used as a bottom pump and a cabin
cleaning pump in ships.
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