Pump casing, impellerWith the
repeated modifications in the design nby means of CAD
know-how and referring the latest hydraulic model, a best match between both
pump casing and impeller is made to get a widest flow-path and a best
performance for sewage to pass through. The impeller has been strictly balanced
so as to reduce vibration to the minimum and extend the duration of both bearing
and mechanical seal to the utmost extent.
MotorA
specially designed and made submersible motor, the stator winding of it is
F-grade dielectric and the limit working temperature of the dielectric material
is 145℃. An
overheat protective component is set inside of the winding to protect the motor
via the electric control cabinet.
Cooling of motorInside
of the pump there is an automatic cooling system, when the motor's power gets
to over 18.5KW, a small portion of the liquid pressed out by the impeller flows
into around the stator room for cooling, capable of ensuring the normal cooling
of the motor when the water pump works at the lowest water level.
Mechanical sealUse the
mechanical seal made in Bogeman, Shanghai, a wearable
friction secondary material of a very low frictional coefficient, an oil-proof
NBR as the rubber part and stainless steel metal parts. Non-failure running can
be up to over 8000h with the normal conditions of use.
Oil roomThe
engine oil inside of the oil room can lubricate the mechanical seal and also
take the heat of the bearing away, as well as resist liquid penetration, an
additional safety function. The water-leak probe placed inside of the oil room,
when the water leaking from the mechanical seal on the pump side to the oil
room gets to a certain concentration, will alarm and stop the pump via the
electric control cabinet to remind of the operator to change the oil or repair
the mechanical seal.
BearingThe bearing on the upper side is a deep-ditch ball bearing and used to bear the radial action force while the one on the lower side to bear both radial and axial forces. Use of the angle contacted ball bearing can fully meet with the effect to eliminate the axial force. The bearing are quality ones imported or of a domestic famous brand and so unable to get damaged during the applicable period of the pump. |
Cable,
sealing of motor
The
cable is a sewage-proof heavy rubber-sleeve soft cable and of an excellent
mechanical strength and oil-sewage resistance. The sectional area and the
current loading capacity of it aim at 40℃ ambient temperature (not the usual 25℃). With
the condition of long-term continual work selected, it has an enough margin and
a longer duration under the normal conditions. The cable gland tightly presses
the seal ring of it to make a reliable seal realized between the cable and the
wiring cavity. The cable is fixed to prevent it from pull-off and fitted with color
mark plus digital mark to have it more easily identified and connected.
Grounding marks and fasteners are set inside of both wiring cavity of the motor
and electric control cabinet to have the cable strictly grounded, safe and
reliable. During assembly, a strict sealing detecting test is carried out for
the O-ring, cable seal and mechanical seal of each pump so as to ensure the
motor cavity, including the wiring cavity, to get reliably sealed.
ProtectorThe
motor winding overheat protective component and the water-leak probe are not
available with the pump of 7.5Kw and below; and available with the one of IlKW and above, plus the float switch. The protector will
not be functional unless being connected to the electric control cabinet
special for the submersible sewage pump. Though it is optional, choose the said
cabinet made in this Co. is intelligent for the sake of your pump to safely and
reliably run, especially of the motor to be avoidable to burning-out. Please
contact with the special group of electric control cabinet of this Co. for the
related electric technical problems, especially those related to the
protectors, if users equip the electric control cabinet themselves.
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About the protectorsOverheat protective componentThe
component motion is controlled by temperature and inlaid in the stator winding
of the motor and, when the winding temperature gets to the set value of it
under an abnormal running condition, makes, via the electric control cabinet,
the OVRHEAT indicator lit and the motor automatically stop, thus telling the
operator to check and find out the cause for the overheat of the motor. When
the winding temperature lowers, the motor can reset to the state able to start.
Water-leak probeUsed for
water leak detection. The two electric poles on one end of it are mutually
insulated and distanced and the lead-outs of them are connected to the electric
control cabinet via cables. The said poles, when the water leaking from the mechanical
seal on the motor side to the oil room gets to a certain level or a little of
water gets int9 the wiring cavity of the motor, will be mutually conducted and,
via the electric control cabinet, send out the alarm signal (the indicator
lights) and automatically cut off the motor's power to tell the operator to
check the mechanical seal or replace the oil in the oil room on time, and, when
water gets into the motor's wiring cavity, will alarm and stop the pump to
prevent short-circuit from producing and tell the operator to take the measures
for check and repair at once.
Float switchUsed to check if the mechanical seal on the motor side is out of work and if any water gets into the motor cavity. It is mounted on the empty cavity on the lower side of the motor cavity and by the bearing, with a hole connected through to the bearing. The float of the switch will float when the mechanical seal is out of work, the oil or water in the oil room or the water going into the motor cavity gets into the empty cavity via the bearing to send out an alarm signal (the indicator lights), via the said cabinet, and make the pump automatically stop running to tell the operator to overhaul the pump. |