WQ series submersible sewage pump developed
in YANESS absorbs the advantages with the same products made abroad and at
home, holds a comprehensive optimized design on its hydraulic model, mechanical
structure, sealing, cooling, protection, control etc. points, features a good
performance in discharging solids and in the prevention of liber wrapping, high
efficiency and energy-saving, strong re-liability and, equipped with a
specially developed electric control cabinet, not only the auto-control can be
realized but also the motor can be made sure to work safely and reliably.
WQ series submersible sewage pump is mainly
used for the municipal works, buildings, industrial sewage and sewage treatment
to discharge the sewage, waste water and rainwater containing solids and long
● The medium temperature is not over 40℃, the medium
density is <1050kg/m³ and the PH value is within 4-10.
● The materials of the main parts of the pump
are cast iron or ductile iron, so it can not be used to pump strong corrosive
medium or that containing strong abrasive solid grains.
● The diameter of the solids in the medium
shall not be bigger than the minimum size of the runner, recommended to be
below 80 of the said size. Please contact YANESS of the pumps in various
specifications thereafter for the runner size and the length of the fibers in
the medium shall not be over the discharge aperture of the pump.
● Most of the impellers with the pump of an
aperture below 400 come as a bi-runner impeller and few of them is a
multi-blade centrifugal impeller. While most of the impellers with the pump of
an aperture 400 and above come as a mixed-flow impeller and few of them is a
bi-runner impeller. The spacious pump casing runner lets the solids easily passing
and the fibers uneasily wrapping so that it is most suitable for discharging
sewage and dirt.
● Two independent single end-face mechanical
seals are in-series mounted, with the installation mode as the internal installation
mode, and, compared with the external installation mode, the medium is more
uneasy to leak and also its sealing friction pair are easier lubricated by the
oil in the oil chamber. A special spiral slot or a small seam is used to resist
the solid grains to be deposited on the mechanical seal by the pump to make
sure ofits stable work. The unique mechanical seal layout mode and bearing
combination makes the suspension arm of the shaft short, a heavy rigidity and a
small jump, more benefit for reducing the leak from the mechanical seal and
extending the life of it.
● The motor of a protective grade IPX8 works
in sub-merged mode and holds the best cooling effect. The grade F insulation
makes the winding bearable to a higher temperature and, compared with common
motors, more durable.
● The perfect combination of the special
electric control cabinet, the liquid level floating-ball switch and the
protective components carries out the automatic monitor and alarm for water
leak and winding overheat, the protections at short-circuit, overload,
lack-of-phase and voltage-lost cut-off, the accurately auto-controls of start,
stop, alternation and minimum submerged depth of the pump, without need of
special persons for looking-after, option at will is available between the
self-coupled reducing start and electronic soft start. All of these make sure
of safe and reliable use of the pump without any worry.
● Both motor and hydraulic parts are directly
linked to-gether, without need of turning the shaft for centering, easily
disassembled and assembled to save the time, benefit for the site maintenance,
reducing the stopped time, saving the cost of repair; simple and compact
structure leaves a small volume, only simple lifting equipment is needed, as a
special lifting handler is set on the pump; less land area and the pump can be
placed directly in the sewage pond, without need of a spe-cial pump house, and
the therefore the construction investment can be saved by over 40.
● Available with five installation modes for
you to choose: auto-coupled, movable hard-pipe, movable soft-pipe, fixed wet
type and fixed dry type installation modes.
● The auto-coupled installation means the
connection between the pump and the water-out pipeline is made with the water
outlet pipe seat of the auto-coupling, without use of the common fasteners,
and, when to separate the pump from the water outlet pipe seat, just place it
down along with the guide rod and then lift it, simply enough to get free from
worry and trouble and save time.
● The submersible sewage pump in the fixed
dry type ins-tallation not only can replace the old vertical sewage pump but
also does not fear of flood submersion, so there is no need of a separate
flood- proof facility, benefit for lowering the cost of construction.
● Movable hard-pipe and soft-pipe
installations, as well as the fixed wet type one, are all the very simple modes
● Motor cooling system can be set with the
pump, which can not only sufficiently cool the motor but also be helpful for
lowering the level of the sewage pond so as to discharge the sewage therein to
the utmost degree.
● The pump works in the submerged mode, so
there is no noise problem and benefit for environmental protection.
● Pump casing, impeller
The design for both pump casing and
impeller has been repeatedly modified by means of CAD technique to make both
best matched the runner most wide and the passing ability of dirt most
optimized. He impeller has been made strictly bal-anced so as to let the
vibration reduced to minimum and the life of both bearing and mechanical seal
to the utmost degree.
The specially designed and made submersible
motor holds a protective grade IPX8, the stator winding is in grade F
ins-ulation and the limit working temperature of the insulation material is 155℃. Overheat
protective element is inlaid inside of the winding and performs protection of
the motor through the electric control cabinet.
● Cooling of the motor
The pump of a power llkW and above can be
set with a motor cooling system to cool the motor. The cooling medium, either
the pumped medium or the externally led-in cooling water (for the pump of a
power llkW-30kW-4P, only the ex-teraally led-in cooling water can be used),
flows in between the stator casing and the cooling sleeve. For the two cooling
modes, the cooling channels arc a little bit different, so it shall be noted at
order when the cooling system is required. In case the pumped medium is used as
the cooling medium, the pump structure can prevent large grains from getting
into the cooling channel. After a long time work, deposit of small grains may
be formed inside of the sleeve and, to eliminate it, flushing with flushing
liquid connected onto the pipe joint of the cool-ing sleeve can be performed.
Use of the motor cooling system is good at lowering the minimum liquid level
and helpful for discharging the sewage in the water collecting well to the most
It is also ok for the pump of a power llkW
and above not to be set with a motor cooling system and let the motor cooled
directly by the pumped medium, however, in this con-dition, the liquid level
will be much higher than that with the cooling system.
The motor with the pump of a power 7.5kW
and below is cooled by the pumped medium through the radiation fins on the
stator casing and it is better for the stator to be submerged in the medium, at
least half submerged.
● Mechanical seal
The mechanical seal is made of the
frictional pair material which is wearable and of a very low frictional
coefficient, the rubber part is made of the oil-resisting
acrylonitrile-butadiene rubber and the metal part is made of stainless steel.
● Oil chamber
In addition to lubricating the mechanical
seal, the oil in the oil chamber also offers the additional safety functions to
bring the heat away from the bearing and resist the liquid penetration.
A water-leak probe is set inside of the oil
chamber and, when the water penetrated in from the mechanical seal by the pump
reaches a certain concentration, it will alarm via the electric control cabinet
to prompt the operator to replace the oil or repair the mechanical seal.
The structure of the injection hole in the
oil chamber can make the oil injection speed quickened and also ensure a
certain volume of air therein so as to have the pressure therein not greatly
rise after the oil temperature gets raised to prevent the mechanical seal from
getting over-wearing or leaking.
The bearing on the upper is a deep groove
ball bearing and used to bear the radial force while the one on the lower bears
both radial and axial forces. Upon the different radial and axial forces, one
double row angular contact ball bearing and one pair of angular contact ball
bearing are designed se-parately with some of the pumps and both are full of
loading margin. All the bearings are the well- known brand products and will
not get damaged within the workable period of the pump.
● Cable and sealing of the motor
The cable is the sewage-resisting
heavy-type rubber-jacket cable and holds an excellent mechanical strength and
oil-dirty resistance. Both sectional area and current-carrying capacity of the
cable conductor are selected according to the long-term continuous work under a
40℃ ambient temperature (not the common 25 *C), so, under the common condition
of use, it holds a sufficient margin with the current-carrying capacity and a
The cable gland tightly presses the cable
seal ring to leave a reliable sealing between the cable and the wiring cavity,
to fix the cable and prevent it from pull-off. With the color mark plus the
digital mark, the cable becomes easier identified and connected. Inside of the
motor wiring cavity and the electric control cabinet grounding marks and
grounding faste-ners are set in order to make the cables strictly grounded,
safe and reliable.
It is required, during the assembling, to
perform a strict sealing check and test on the O-ring, the cable's seal and the
mechanical seal so as to make sure of a reliable sealing of the motor cavity,
and the wiring cavity as well.
For the pump of 30kW-4P and below, both
motor winding overheat protective element and water-leak probe are set; while
for that over 30kW-4P, a motor winding overheat protective element and a lower
float switch are set, as well as a upper float switch which is set inside of
the upper end-cover of the motor. These protectors will not function until
being linked to the electric control cabinet special for the submersible sewage
pump. Though the said electric control cabinet made in this Co. is optional at
supply, selection of it is still sensible, in order to have the pump safely and
reliably workable and, in particular, to avoid bumt-out of the motor. When the
electric control cabinet is prepared by the user himself, please do contact the
electric control cabinet special group of this Co. for the related problems of
electric technique, especially those on the protectors.
For more information of the submersible
sewage pump, please contact YANESS.