Submersible Sewage Pump

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.

Application

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 fibers.

Operating Environment

● 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.

Pump Details

Advantage

● 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 of installation.

● 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.

Structure

● 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.

● Motor

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 degree.

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.

● Bearing

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 longer life.

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.

● Protectors

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.