Mainly used in sewage treatment plants, municipal sewage lifting pumping stations, water mills, water conservancy irrigation and drainage projects, water diversion projects, integrated pumping stations, etc. to discharge sewage and wastewater containing solids and long fibers.

1. The medium temperature does not exceed 40°C, the medium density is ≤1050 kg/m3, and the PH value is within the range of 4~10.
2. The liquid level of the pump must not be lower than the “▽” size in the installation size diagram during operation.
3. The main parts of the pump are made of gray cast iron and ductile iron, so it cannot be used to pump media that is highly corrosive or contains highly abrasive solid particles.
4. The diameter of the solid objects in the medium should be smaller than the minimum size of the flow channel. For details on the size of the solid objects, please refer to the “WQ (11-22kW) Series Submersible Sewage Pump Performance Parameter Table”.
5. The length of fibers in the medium should be smaller than the discharge diameter of the pump.

1. Unique no-overload water design and innovative pump technology for sewage treatment

Innovative high-efficiency non-overload water model design concept, while taking into account the passing capacity of the sewage pump. Completely eliminates worries about water pump operation.

Technical characteristics of the overload-free water model: the maximum power point appears in the high-efficiency zone, and the operation is smooth and vibration-free.

Impeller passing ability: The impeller has undergone extensive CFD research, analysis and testing to achieve the best balance between the impeller blades and the solid passing ability. The unique design of the flow-passing parts ensures the passing of solid objects and the anti-entanglement of fibers.

2. Excellent mechanical seal

It adopts imported Borgmann mechanical seal, and the pump head mechanical seal is made of silicon carbide versus tungsten carbide, which provides the greatest anti-wear capability. The mechanical seal is designed to have a service life of 15,000 hours.

3. Mechanical seal self-cleaning technology

Two single-end mechanical seals are installed in series, and special spiral grooves or small gaps are used at the pump cover to prevent solid particles from depositing to the mechanical seal on the pump side, so as to achieve the self-cleaning function of the mechanical seal and extend the service life of the mechanical seal.

4. Short shaft extension design

The short shaft extension design can significantly eliminate shaft eccentricity errors. Reduce the center of gravity of the water pump, reduce the vibration of the water pump operation, and extend the life of the mechanical seal and bearings.

5. Bearing design

The bearings are designed with a minimum service life of 100,000 hours to ensure normal operation of the water pump.

5. Submersible motor reliability design

The motor insulation grade is H grade, with a maximum allowable temperature of 180°C, which is a qualitative improvement over F grade. The motor can withstand higher temperatures and is more durable.

7. General water pump installation design

The installation methods are diverse, including automatic coupling installation. The pump and the outlet pipe are connected through the outlet pipe seat of the coupling device without conventional fasteners.

When connecting and disconnecting the pump from the outlet pipe holder, you only need to simply lower and lift the pump along the guide rod, which saves worry, trouble and time.

Pump body   impeller

It adopts CFD technology to optimize the design, adopts a wide outlet high-efficiency non-overload impeller, and has the best balance between non-overload water design and high throughput capacity. The flow channel is wide and the dirt can pass through the best. The impeller undergoes rigorous dynamic balancing testing to minimize vibration and maximize the life of the bearings and mechanical seals.

Pump cover

Designed with self-cleaning technology, the pump cover has an annular spiral groove structure. When the medium particles rotate at the pump cover, they are thrown outward by centrifugal force, which can prevent particles from gathering in the sealing chamber.Achieve the self-cleaning effect of the machine seal.

Motor

The submersible motor is specially designed and manufactured with a protection level of IP68. The stator winding is H-class insulation. The ultimate working temperature of the insulating material is 180°C. At the same time, the windings are embedded with overheating protection components to protect the motor through the electric control cabinet.

Motor cooling

The motor is cooled by the pumped medium through the heat sink on the stator housing. The medium needs to submerge the motor, and the lowest pump stop position should not be lower than the liquid level marked “▽” in the installation dimension diagram.

The electric pump can be specially equipped with a motor cooling system to cool the motor. The cooling medium flows between the stator housing and the cooling sleeve. The cooling medium can be the pumped medium or external cooling water. The cooling channels used for cooling by pumped media and cooling by external cooling water are different. Therefore, when users want to install a cooling system, they should indicate in the order whether cooling by pumped media or external cooling water is used. When the cooling medium is the pumped medium, the structure of the pump prevents large particles from entering the cooling channels. After long-term operation, small particles may accumulate in the sleeve, which can be flushed by external flushing fluid through the pipe joint on the cooling sleeve.

Machinery Seal

Burgmann mechanical seal is adopted. The mechanical seal uses friction material with low friction coefficient and wear resistance. The rubber parts are oil-resistant nitrile rubber and the metal parts are stainless steel. The mechanical seal on the pump side is made of silicon carbide/tungsten carbide pairing, with a designed service life of 15,000 hours.

Oil room

The oil in the oil chamber is made of 32# anti-wear hydraulic oil. The implementation standard is: GB1118.1-2011. In addition to lubricating the mechanical seal, it can also take away the heat from the bearing. The oil chamber also has an additional safety function of preventing liquid penetration. . A water leakage probe is installed in the oil chamber. When the medium on the pump side leaks into the oil chamber, the water leakage probe will alarm and stop the pump through the electric control cabinet to remind the operator for maintenance.

The amount of refueling should be based on the oil overflowing from the oil filling hole, and it should ensure that there is a certain volume of air left in the oil chamber so that the pressure in the oil chamber will not rise significantly when the oil temperature rises, thereby avoiding excessive wear or leakage of the mechanical seal.

Bearing

The entire series uses original imported SKF bearings as standard. The upper bearing is a deep groove ball bearing or a cylindrical roller bearing, which is used to withstand radial force.

The lower bearing is used to bear radial force and axial force. Each model of pump varies according to the size of radial force and axial force.

Some are designed as a double row corner contact ball bearing, and some are designed as a pair of corner contact ball bearings plus a cylindrical roller bearing, both of which have sufficient load margin.

The bearing is designed to have a service life of 100,000 hours and is lubricated with 3# lithium grease.

Cable motor seal

The cable is made of heavy-duty rubber-sheathed flexible cable that is resistant to pollution and has excellent mechanical strength and oil resistance. The cable conductor cross-sectional area and current-carrying capacity are selected based on the ambient temperature of 40°C and long-term continuous operation. Therefore, under normal usage conditions, the cable’s current-carrying capacity has sufficient margin. , longer life.

The cable gland presses the cable sealing ring to achieve reliable sealing between the cable and the wiring cavity. Secure the cable to prevent it from pulling out. Cables use color markings and digital markings to make cable identification and connection easier. The motor wiring cavity and the electric control cabinet are equipped with grounding signs and grounding fasteners, and the cables are strictly grounded for safety and reliability.

During the assembly process, strict sealing testing tests are conducted on each pump’s O-ring, cable seal, and mechanical seal to ensure reliable sealing of the motor cavity, including the wiring cavity.

protective device

The water pump is equipped with a motor winding overheat protection component, a motor cavity oil and water probe, and an oil chamber cavity water leakage probe. In order for your pump to operate safely and reliably, especially to prevent the motor from burning out, it is recommended to use our company’s special electric control cabinet for submersible sewage pumps. When users prepare their own electrical control cabinets, please be sure to contact our company’s professional electrical control cabinet team for electrical technical issues, especially electrical technical issues with protective devices.

Overheating protection element

The overheating protection element is an electrical appliance controlled by temperature and is embedded in the stator winding of the motor. Under abnormal operating conditions, when the winding temperature reaches the set value of the overheating protection element, the overheating protection element lights up the “overheating” indicator light through the electric control cabinet and automatically stops the motor to remind the operator to check. Find out why the motor is overheating.

After the winding temperature drops, the motor will return to the start-up state.

Oil and water probe

Oil and water probes are used for water leakage or oil leakage detection. The water leakage probe in the oil chamber is referred to as the oil probe. When the mechanical seal on the impeller side is damaged and the water in the leaking oil chamber reaches a certain level, the two electrodes of the water leakage probe are connected and an alarm signal is sent through the electric control cabinet (the indicator light is on).Remind the operator to promptly check the mechanical seal or replace the oil in the oil chamber.

The water leakage probe in the motor cavity is referred to as the water probe. It is installed in the cavity on the lower side of the motor cavity and next to the bearing. The cavity has a hole communicating with the bearing chamber. When the mechanical seal on the motor side fails, the oil in the oil chamber enters the cavity through the bearing chamber, or the water entering the motor flows into the cavity, which will cause the two electrodes of the leakage probe to conduct, and an alarm signal will be sent through the electric control cabinet ( The indicator light lights up) and the pump automatically stops running, reminding the operator to inspect the pump.

Lifting device

The lifting frame of the pump is made of 304 material and is designed with a larger space for convenient hooks, making it easy to lift and durable.

KQ510 type water leakage thermal protector

KQ510 type water leakage and overheating protector realizes oil chamber water leakage, motor cavity water leakage, junction box water leakage and winding overheating detection and fault output; the three sets of water leakage signal inputs have hysteresis characteristics and other functions.

Power supply: AC220V, 50Hz, input power 5W.

Usage environment: temperature -20℃~+50℃, relative humidity ≤85%RH.

Relay contact capacity: 5A 250VAC

The following is a comparison between the panel and the actual object:

1. Power supply 220V  2.Fault output  3.Fault output   4.Public end   5.Oil chamber leaks  6.Motor cavity leaks   7.The junction box is leaking   8.Winding overheated

Signal input

COM and R1 are the input terminals for water leakage in the oil chamber;

COM and R2 are the input terminals for leakage in the motor cavity;

COM and R3 are the input terminals of the junction box leakage;

COM and K1 are the input terminals for motor winding superheat.

Fault output

J1 is the fault output, open when there is no fault, closed when there is a fault, switching value;

J2 is the fault output. It is closed when there is no fault and disconnected when there is a fault. It is a switching value.

Fault detection

When the oil chamber leakage probe detects that the resistance value is <15K, the corresponding indicator light will light up and the fault output relay will act; when the resistance is >20K, the fault will disappear and the protector will return to its initial state (i.e. hysteresis characteristics). The input has a delay of 1s to 5s. The smaller the input resistance, the shorter the delay time, and vice versa.

When the motor cavity leakage probe detects that the resistance value is <30K, the corresponding indicator light lights up and the fault output relay operates; when the resistance is >35K, the fault disappears and the protector returns to its initial state (i.e. hysteresis characteristics). The input has a delay of 1s to 5s. The smaller the input resistance, the shorter the delay time, and vice versa.

When the junction box leakage probe detects that the resistance value is <30K, the corresponding indicator light will light up and the fault output relay will act; when the resistance is >35K, the fault will disappear and the protector will return to its initial state (i.e. hysteresis characteristics). The input has a delay of 1s to 5s. The smaller the input resistance, the shorter the delay time, and vice versa.

When the winding overheat probe detects that the temperature exceeds the specified temperature (the temperature value is determined by the overheat probe selected by the user) and disconnects, the corresponding indicator light lights up and the fault output relay operates. When the temperature returns below the specified temperature and closes, the fault disappears and the protector returns to its initial state. The input has a delay of 1s to 2s.

 KQ1010 type water leakage thermal protector

KQ1010 water leakage and overheating protector realizes oil chamber water leakage, motor cavity water leakage, junction box water leakage and winding overheating detection and fault output;

It can also realize two-channel PT100 temperature collection and display, alarm temperature setting fault output and other functions.

Power supply: AC220V, 50Hz, input power 5W.

Usage environment: temperature -20℃~+50℃, relative humidity ≤85%RH.

Relay contact capacity: 5A 250VAC

PT100 temperature display range: -199.9℃~+199.9℃

The following is a comparison between the panel and the actual object.

1. Power supply 220V  2.Fault output  3.Fault output   4. Work setting   5. Temperature setting  6. Temperature setting   7.Public end   8.Oil chamber leaks   9. Motor cavity leaks
2. The junction box is leaking  11. Winding overheated  12.Public end  13.Temperature 1 PT 100  14.Temperature 2 PT100

Signal input

COM1 and R1 are the input terminals for water leakage in the oil chamber;

COM1 and R2 are the input terminals for leakage in the motor cavity;

COM1 and R3 are the input terminals of the junction box leakage;

COM1 and K1 are the input terminals of the superheated motor winding;

COM2, PA1 and PA2 are the input terminals of PT100 with temperature 1, using a three-wire connection method (two wires of the same color in PT100 are connected to COM2 and PA1 respectively, and the other wire is connected to PA2);

COM2, PB1 and PB2 are the input terminals of PT100 at temperature 2, using a three-wire connection method (two wires of the same color in PT100 are connected to COM2 and PB1 respectively, and the other wire is connected to PB2)

Fault output

J1 is the fault output, it is opened when there is no fault and closed when there is a fault, switching value;

J2 is the fault output. It is closed when there is no fault and disconnected when there is a fault. It is a switching value.

Temperature alarm setting

Release the button and the display will show the detected temperatures of the two PT100s;

Press the button to set the alarm temperature displayed on the display;

Temperature 1 potentiometer can change the alarm temperature value set by the first PT100;

The temperature 2 potentiometer can change the alarm temperature value set by the second PT100.

Fault detection

When the oil chamber leakage probe detects that the resistance value is <15K, the corresponding indicator light will light up and the fault output relay will act; when the resistance is >20K, the fault will disappear and the protector will return to its initial state (i.e. hysteresis characteristics). The input has a delay of 1s to 5s. The smaller the input resistance, the shorter the delay time, and vice versa.

When the motor cavity leakage probe detects that the resistance value is <30K, the corresponding indicator light lights up and the fault output relay operates; when the resistance is >35K, the fault disappears and the protector returns to its initial state (i.e. hysteresis characteristics). The input has a delay of 1s to 5s. The smaller the input resistance, the shorter the delay time, and vice versa.

When the junction box leakage probe detects that the resistance value is <30K, the corresponding indicator light will light up and the fault output relay will act; when the resistance is >35K, the fault will disappear and the protector will return to its initial state (i.e. hysteresis characteristics). The input has a delay of 1s to 5s. The smaller the input resistance, the shorter the delay time, and vice versa.

When the winding overheat probe detects that the temperature exceeds the specified temperature (the temperature value is determined by the overheat probe selected by the user) and disconnects, the corresponding indicator light lights up and the fault output relay operates. When the temperature returns below the specified temperature and closes, the fault disappears and the protector returns to its initial state. The input has a delay of 1s to 2s.

PT100 temperature detection

The protector is designed with dual PT100 inputs. In order to eliminate the impact of excessive PT100 lead wires on temperature, a three-wire design is adopted. The temperature detection range is -199.9℃~+199.9℃, and is displayed in the display window. When the detected temperature exceeds the set alarm value, the corresponding indicator light lights up and the fault output relay operates. When the detected temperature When the temperature is lower than the set alarm value, the fault disappears and the protector returns to its initial state.

PT100 alarm temperature setting

The two-channel PT100 alarm temperature values can be set. Press the alarm temperature setting button and the display window will switch to the display of the alarm temperature set value. Adjust the two alarm temperature setting potentiometers respectively to change the alarm temperature value. After the setting is completed, press the alarm temperature setting button again, and the display window switches to the display of the temperature value collected by PT100.

Special electric control cabinet for submersible sewage pumps

The KQK-B control cabinet supporting the submersible sewage pump is an automatic control system that is economical, practical, 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 and has protection functions such as short circuits, phase loss, overload, motor cavity leakage, oil chamber leakage, and winding overheating. The control cabinet can be equipped with various liquid levels sensors such as float-level switches, and plunge-type or ultrasonic sensors, which can automatically control the start and stop of the water pump according to the level of the liquid when no one is on duty. 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 into operation. The 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 Dexi; the control cabinet components with high-end configuration are mainly from internationally renowned brands such as Schneider, Xizi, ABB, etc.

WQ (11-22kW) series special control cabinet model naming method for submersible sewage pumps

Selection and description of special control cabinet for WQ (11-22kW) series submersible sewage pumps

The following table lists the control cabinet models and box sizes used for direct starting of supporting submersible sewage pumps.

Autocoupling step-down starting

It refers to using an 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 allowable starting current and the required starting torque to achieve step-down starting, and it can be used regardless of the Y or Δ connection of the stator winding of the motor.

The following table lists the control cabinet model and box size selected for the automatic step-down 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 end of starting, giving the motor full voltage. . The voltage slowly increases from zero to the rated voltage, so that the starting current of the motor during the starting process changes from the uncontrollable overload impact current to a controllable one, and the starting current can be adjusted as needed.

There is no impact torque during the entire starting process and the motor starts 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 stop can also be achieved. Due to the use of semiconductor converter technology, high harmonics will be generated, causing pollution to the power grid.

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

(Liquid level) float switch, terminal box and conduit and cable model

(Liquid level) float switch schematic diagram

The minimum fluid level is marked on the submersible sewage pump catalog and instructions. “▽” means the liquid level at which the stator part of the motor is half submerged by the medium. Lower liquid level Float level The float switch is used when the electric control cabinet is placed in automatic gear.

Wiring and setting of the liquid level float switch: There are three wire cores in the cable of the liquid level float switch: black, brown and blue.

When the float floats, the internal contacts of the float connect the black and brown wire cores and disconnect the black and blue wire cores;

When the float droops, the opposite is true. The internal contact connects the black and blue wire cores and disconnects the black and brown wire cores. When the float is in the middle position, the internal switch maintains its original position. The internal switch only changes action when it reaches the floating and sagging positions as shown in the figure. In the case of water drainage, connect the black and brown wire cores to the electric control cabinet, and the blue wire core must be wrapped and insulated; in the water supply situation, connect the black and blue wire cores to the electric control cabinet, and the brown wire core must be wrapped and insulated.

If a float switch is used to control the two liquid levels of starting and stopping the pump, the position of the weight on the cable can be adjusted, which determines the liquid level difference between opening and closing of the water pump.

So in principle, a float switch can realize a set of upper and lower liquid level start and stop pump control. However, if the liquid level difference is large, the length of the float swing arm will increase, and the weight of the cable from the weight to the float will affect the accuracy of the liquid level control.

Therefore, our company’s special electric control cabinet for submersible sewage pumps is set up with float switches like this:

For the main pump or large pump, use two float switches to control the start and stop liquid levels respectively;

For small pumps or backup pumps with extra high water levels, a float switch is used to control the two liquid levels of starting and stopping the pump. When users need more than the specified number of float switches or do not order our special electric control cabinet for submersible sewage pumps, they can also order float switches from us.

Terminal boxes and conduits

When the electric control cabinet is far away from the pump room, a terminal box can be installed. The terminal box is an optional accessory.

This picture is for illustration only and does not represent a design specification. Matters such as pump station design and safety should be handled in accordance with relevant standards and specifications. When it is necessary to install a threading tube (the threading tube is prepared by the user), the inner diameter of the threading tube should be determined according to the outer diameter of the cable.

Choose the conduit appropriately according to the size and installation quantity in the table below.

In order to make the pump you choose more suitable, users are warmly welcome to consult our company’s technical department for technical issues.

1. When ordering, please indicate: serial number, impeller number, material of flow parts, installation method, and discharge port diameter.
2. The installation method of the water pump is subject to the installation diagram on the sample.
3. Due to the excellent design of the coupling frame in the coupling device, the guide rod only needs to use ordinary water pipes or steel pipes.

We have provided the specifications and length calculation method of water pipes or steel pipes used as guide rods in the sample. Users only need to purchase water pipes or steel pipes by themselves and cut them to the required length.  so the coupling device does not include the guide rod.

4. This series of water pumps are not equipped with a motor cooling system. If a cooling sleeve is required, it is a special order and the delivery time will be extended.
5. Standard configuration, motor cable is provided according to 10 meters. When users require other lengths, they should indicate this on the order.
6. Complete sets of supply parts are supplied according to the installation method selected by the user.
7. Users of optional parts and spare parts need to order separately.
8. For hard pipe mobile installation Y, each pump is supplied with a complete set of elbow joints; for hose mobile installation R, each pump is supplied with a complete set of hose elbow joints. If a pump for mobile installation requires more than one elbow or hose elbow, these must be ordered separately.
9. The diameters of elbow joints are: 50, 65, 80, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600.
10. The diameters of hose elbow joints are: 50 (matched with 64 hose), 50×65 (matched with 76 hose), 65 (matched with 76 hose), 80 (matched with 89 hose), 100 (equipped with 102 hose), 150 (equipped with 152 hose).
11. The tapered tube is an optional part. Its two end diameters are: 50×65, 50×80, 65×80, 80×100, 100×150, 150×200, 200×250, 250×300, 300×350 , 350×400, 400×450, 450×500, 500×600. The tapered tube installed in the discharge line should be used for diffusion and not for contraction.
12. When the tapered pipe and the elbow joint on the discharge pipeline are connected to each other, the diameter of the elbow joint should be consistent with the diameter of the large end of the tapered pipe, that is, the principle of “diffusion first and then turning” should be followed.In this way, the pipeline loss is less than “turn first and then spread”.
13. For coupling-installed pumps, if the diameter of the discharge pipe is larger than the diameter of the pump, a tapered pipe can be installed on the outlet pipe holder. The diameter of the small end of the tapered pipe should be the same as the diameter of the outlet pipe holder. That is, the diameter of the pumps is the same.
14. For the specifications, nominal pressure and size of elbow joints, hose elbow joints and tapered pipes, please refer to the “Accessories Description” at the end of the sample.

WQ (11-22kW) series submersible sewage pump supply list

 Description of type spectrum:

1. In order to make the model chart neat, the model chart lists the general range of most models, which can be used for preliminary selection. However, the complete water pump curves and parameters must be seen in the single-page performance curve chart introduced later.
2. The WQ/E and WQ/EC series in the picture are detailed in the samples of “WQ/E Series Small Submersible Sewage Pump” and “WQ/EC Series Small Submersible Sewage Pump”.