1. Cable
2. Seal off the machine
3. Pump body
4. Impeller
5. Cutting board
6. Cutting knife
7. Base
8. Handle
9. Motor upper-end cover
10. Upper bearing
11. Stator
12. Rotor
13. Lower bearing
14. Connecting seat
15. Seal on the machine
16. Pump cover

The cable sealing head is integrated with the cable for complete sealing

1. The cable sheath is tightly sealed by the sealing head
2. The cable core is also tightly sealed by the sealing head
3. Pressure seal between the elastomer of the sealing head and the motor cover
4. The wire cores are separated by sealing materials and tightly sealed

1. Selected pump body and impeller

CAD technology is used to repeatedly modify the design to optimally match the impeller and the cutting module. Long fibers can easily pass through after being chopped without getting entangled and blocked. The impeller is strictly balanced, resulting in small vibration and smooth operation of the pump.

2. Highly reliable submersible motor

The specially designed and manufactured submersible motor has a protection level of IP68 and a stator winding with Class F insulation. Due to the good cooling effect during submersible operation, the actual temperature rise of the winding is low, making the motor more durable.

The motor dissipates heat through the casing. As long as the medium submerges half of the height of the motor stator, it can run reliably and safely. The more submerged, the more conducive to the cooling of the motor.

The cable is a sewage-resistant heavy-duty rubber-sheathed flexible cable. The cable core cross-section is selected for continuous full-load operation at an ambient temperature of 40°C, and is very reliable. The cables are fixed twice on the handle to avoid damage during transportation, installation and use.

3. The motor has tight sealing and strict inspection.

1) Shaft sealing

Two independent single-end mechanical seals are arranged on the pump side and motor side respectively to form two shaft seals. The leakage volume is only less than one-tenth of the double-end mechanical seal. The lubricating oil in the oil chamber lubricates and cools the friction pair of the motor side mechanical seal.

The mechanical seal on the pump side that contacts the medium uses a silicon carbide/silicon carbide “hard-to-hard” friction pair, which has high hardness and low friction coefficient and is not prone to wear and failure;

The mechanical seal on the motor side, which is entirely immersed in oil, uses a graphite/silicon carbide “soft-to-hard” friction pair. The friction coefficient is very low and it is easy to “run in”, making the seal reliable. The small gap between the impeller and the pump cover can prevent impurities from entering the shaft seal cavity while maintaining good working conditions of the mechanical seal. The rubber parts of the mechanical seal are made of nitrile rubber with excellent oil resistance, and the springs and other structural parts are made of stainless steel.

2) Complete sealing of cables

The WQ/ES pump motor cable adopts a fully sealed structure with a cast head. The cable sheath, cable core and cast head are vulcanized into a whole to ensure that water will not enter the motor cavity through the cable sheath or the gap between the wire cores. However, the cable ends should not be exposed to water. Water entering the cable will seriously reduce the insulation resistance of the cable and affect safety.

3) Seal between parts

O-rings are used as reliable static seals at the joints and fits between the parts.

4) Sealing inspection

Parts can only be assembled after passing the pressure test. Each pump undergoes strict air pressure tests during and after assembly to ensure the sealing of the motor.

4. Reliable bearing configuration

Use famous brand and high-quality deep groove ball bearings or double row angular contact bearings, which have sufficient load margin to ensure reliable operation of the product.

5. Cutting module

The cutting knife rotates at high speed with the rotor and forms a shearing effect with the cutting disc. The inhaled long fibers are rotated and sheared at high speed. The chopped fibers enter the pump body and are thrown into the pipeline following the rotation of the impeller and discharged. The cutting knife is made of stainless steel and heat-treated. The blade has sufficient hardness and can maintain strong cutting performance for a long time.

1. Independent cutting module, good cutting function and not easy to block. As long as it can enter through the suction port, it can be easily chopped. It can transport light wastewater, septic tanks, hospital sewage and other media containing long thin fibers, and large particle media cannot be transported. The shredding function prevents the pump and pipes from being blocked by debris in the sewage. However, in order to better ensure the reliability of water pump operation, it is recommended to set up a dirt-blocking device in the environment outside the medium.
2. The cutting module is made of stainless steel and has been heat-treated. The blade has sufficient hardness and can maintain strong cutting ability for a long time. If the cutting capacity decreases after long-term operation, the cutting module can be replaced separately.
3. Both the pump side and the motor side are equipped with mechanical seals to achieve reliable double submersible shaft seal protection for the motor. The oil in the oil chamber fully lubricates and cools the mechanical seal.

1. When ordering, please indicate the product name, model, installation form, etc.

The impact of medium gravity on power should be taken into consideration when selecting models. Users are warmly welcome to consult our company’s technical department for technical issues.

1. The standard length of the motor cable is 10m. If other lengths are required, please indicate it when ordering and indicate it on the order.
2. Complete sets of supplied parts are supplied according to the installation method selected by the user. Optional parts and spare parts must be ordered separately by the user.

Due to the simple design of the coupling device, the guide rod only needs to use ordinary water pipes or steel pipes. We have previously provided the specifications and length calculation method of the water pipe or steel pipe used as a guide rod. Users only need to purchase the water pipe or steel pipe by themselves, cut it to the required length, and then use it. Therefore, when the guide rod is not installed as a coupling complete set of supplied parts. When the user needs the guide rod provided by our company, he must order it separately and write it into the order.

1. Overview of control cabinet products

The KQK-E control cabinet for this series of submersible sewage pumps of 7.5KW and below, and the KQK-B control cabinet for submersible sewage pumps of 11KW and above, are an automatic control system that is economical, applicable, safe, reliable, and easy to maintain. The control cabinet uses low-voltage electrical appliances and liquid level sensors from well-known domestic and foreign brands. The KQK-E type control cabinet has short circuit, phase loss, and overload functions; the KQK-B type control cabinet also has motor cavity leakage, oil leakage, and motor cavity leakage on the basis of KQK-E. Protection functions such as room water leakage and winding overheating. The control cabinet can adopt ordinary relay control or panel controller control schemes, and is equipped with float level switches, water level electrodes and other liquid level sensors. When unattended, the start and stop of the water pump can be automatically controlled according to the level of the liquid level. Except for single-control products, all products with main and backup pump control have the function of automatically shutting down the faulty pump and automatically putting the backup pump on. Two-pump and three-pump control cabinets can realize automatic alternating or cyclic operation to achieve equal running time of each pump.

The control cabinet components with general configuration are mainly from well-known domestic brands such as Tianzheng, Chint, and Delixi; the control cabinet components with high-end configuration are mainly from internationally renowned brands such as Schneider, Siemens, and ABB.

1. Selection of supporting control cabinet models of 7.5KW and below

Naming method for control cabinet models of 11KW and above

Selection of supporting control cabinet models for 11KW and above

The following table lists the control cabinet models and box dimensions selected for direct start of the submersible sewage pump.

Note: A in the list means automatic alternation or circulation, which can be changed to H to manually select the main and backup pumps.

Note: A in the list means automatic alternation or circulation, which can be changed to H to manually select the main and backup pumps.

Auto-coupling step-down starting

It refers to the use of autotransformer to reduce the starting voltage applied to the stator winding of the motor when starting the motor. After the motor starts, disconnect the motor from the autotransformer so that it can operate normally under full voltage.

Different taps of the autotransformer can be selected according to the allowed starting current and the required starting torque to achieve step-down starting, and it can be used regardless of the Y or △ connection method of the stator winding of the motor.

The following table lists the control cabinet models and box dimensions selected for the auto-coupled pressure-reduced starting of the submersible sewage pump.

Electronic soft start

The soft starter connected in series between the power supply and the controlled motor controls the conduction angle of the internal semiconductor (thyristor), so that the motor input voltage gradually increases from zero according to a preset functional relationship until the start is completed, giving the motor full voltage. The voltage is slowly increased from zero to the rated voltage, so that the starting current of the motor during the starting process is changed from uncontrollable overload impact current to controllable and the starting current can be adjusted as needed.

There is no impact torque during the entire starting process and the motor is started smoothly. Various parameters during the starting process, such as current limit value, starting time, etc., can be adjusted according to the characteristics of the motor load. Soft parking can also be achieved. Due to the use of semiconductor converter technology, high-order harmonics will be generated, causing pollution to the power grid.

The following table lists the control cabinet models and box dimensions selected for the electronic soft start of the submersible sewage pump.