Product
Submersible Sludge Pump
Product Introduction:
Overview

NSQ submersible sludge pump is hydraulic machinery, the motor and the pump of which are coaxially submerged in medium to work. The overflowing parts of the pump are made from high alloy wear-resistant material, so the pump has good wear resistance and large flowing passage. It is applicable for conveying media such as sludge, ore slurry, coal slurry, sandstones containing big solid particles. The product is designed and manufactured by domestic and oversea advanced technologies. Besides the main impeller, the bottom of the pump is additionally provided with a set of agitation impeller which can spray the deposited sludge into turbulent flow, and therefore the pump realizes high-concentration conveying under the condition of no auxiliary device. The unique seal device can effectively balance the pressure inside and outside the oil chamber, so as to protect the reliability of the mechanical seal to the maximum extent. The motor adopts various protective measures such as overheat protection, water inlet detecting protection, and can operate safely for a long term in harsh working conditions.

The pump is applicable for pumping sand for building, silty sand, silt, tailing slurry, ore, iron sand ore, sediment in sewage treatment works, etc.

 
Model Implication
 

 
Structural Property
 

1.The whole machine is dry submersible pump, and the motor adopts oil chamber seal mode and is provided with mechanical seal inside, so that high pressure water and impurities are effectively prevented from entering inner cavity of the motor.

2.Besides the main impeller, there is the agitation impeller which can agitate the sludge deposited on the water bottom into turbulent flow and pump the sludge out.

3.The trans-flux parts such as the impeller and the agitation impeller are made from high-hardness high chromium cast steel, have wear resistance, corrosion resistance and strong drainage capacity, and allow big solid particles to pass.

4.The motor is submerged in water, is not limited by suction stroke, and has high sludge suction rate and thorough desilting.

5.The integral device is simplified, needs no auxiliary stirrer device or ejector device, and has simple and convenient operation and low total investment of the unit.

6.The agitation impeller directly approaches the depositional surface, and controls the concentration through submerged depth. Under the condition of large medium proportion, an auxiliary device can be arranged to increase the concentration of the medium.

 
Use Conditions
 

1.The power source is 50Hz/380V three-phase alternating-current supply, and the capacity of the substation transformator is two to three times of the rated capacity of the motor.

2.The temperature of the medium cannot exceed 60℃, and the medium does not contain inflammable or explosive gases.

3.The maximum weight concentration of the solid particles in the medium: the maximum weight concentration of the ash is 45% and the maximum weight concentration of the slag is 60%.

4.The submerged depth of the unit is not more than 20 meters, and the minimum submerged depth takes submerging of the motor as reference.

5.The unit works in the medium vertically, and the working status is continuous.

 
Product Selection
 
NSQ submersible sludge pump has many specifications to meet different working conditions of different users. As long as specifications and modes meeting the working conditions are reasonably and correctly selected, the best benefit can be obtained with less investment; simultaneously, reasonable working conditions can effectively prolong the service life of the pump, and the methods are as follows:

1. Whether the field conditions (such as voltage, frequency, water quality, power source and capacity) accords with the use conditions is mastered.

2. The pump specification is selected:

1) Initial selection of the flow rate: the flow rate of the pump is determined according to demands.

2) Determination of pipes:critical sedimentation flow velocity is calculated according to the conveyed medium, so as to reasonably select the pipe diameter.

3) Calculation of pipe loss: the pipe loss is calculated according to the length of the pipe and the number of the syphons and valves.

4)Calculation of the pump lift: the pump lift=vertical height difference from the water surface to the water outlet + pipe loss + outlet pressure+safety margin (10%)

5)The pump specification is determined according to the pump lift and flow rate.

6)The installation mode is determined: fixed mode and mobile mode.

3. Friendly Tips

1)Only closed system has outlet pressure, and the outlet pressure of the open system is zero.

2)The power of the matched motor of the pump is calculated according to intermediate concentration (the medium density is 1.3.), and the power should be rechecked when the pump is used for high-concentration conveying.

3) when the medium cannot submerge the motor or the temperature of the medium is more than 60℃, a cooling shield is adopted for forced cooling, the pressure of the cooling water is 2-3kg, and the flow rate of the cooling water is 5-8 m3/h.

4)The outlet of the pump should be provided with a valve; when the pump is started, the valve should be closed and then the motor is started, and the valve is gradually opened after the motor normally rotates.

5)The valve should be closed first and then the power source is cut off when the pump is shut down, so as to prevent water hammer in the pipe from severely damaging the pump.

6)In order to prevent blockage of the pipe, clear water should be conveyed for a while to clean the pipe before machine halt, until clear water flows out from the water outlet.

 

Performance Parameters and Curve

 

No.
Model

Flow Rate m3/h

Pump Lift
m
Motor Power kw
Speed
r/min
Efficiency
Discontinously Passed Maximum Particle Size mm
Water Outlet Diameter mm
Production Status
1
NSQ30-30-7.5

24

31

7.5

1460

43

13

80

30

30

36

29

2
NSQ50-21-11
35

22

11

1460

48

21

100

50

21

60

20

3

NSQ100-16-11

70

20

11

1460

55

21

100

100

16

120

15

4

NSQ50-26-15

35

29

15

1460

48

13

80

50

26

60

24

5

NSQ60-30-15

42

33

15

1460

50

13

100

60

30

72

27

6

NSQ100-18-15

70

20

15

1460

55

21

100

100

18

120

15

7

NSQ150-15-15

105

17

15

1460

56

21

150

150

15

180

13

7

NSQ150-15-15

105

17

15

1460

56

21

150

150

15

180

13

8

NSQ150-22-22

105

25

22

980

60

32

150

150

22

180

20

9

NSQ200-15-22

140

17

22

980

60

45

150

200

15

240

13.5

10

NSQ150-30-30

105

33

30

980

50

21

150

150

30

180

26

11

NSQ300-20-37

240

22

37

980

58

28

150

300

20

360

17

12

NSQ200-30-45

140

33

45

980

53

25

150

200

30

240

27

13

NSQ150-45-55

105

47

55

980

50

21

150

150

45

180

42

14

NSQ250-35-55

175

38

55

980

53

36

150

250

35

300

33

15

NSQ600-15-55

420

18

55

980

62

32

250

600

15

720

11

16

.
NSQ200-45-75

140

48

75

980

52

18

150

200

45

240

41

17

NSQ400-25-75

280

29

75

980

62

29

200

400

25

480

23

18

NSQ500-25-90

350

30

90

980

65

25

200

500

25

600

20

19

NSQ400-50-110

280

54

110

980

56

28

200

400

50

480

45

20

NSQ1000-18-110

700

22

110

980

68

50

300

1000

18

1200

13

21

NSQ780-26-110

545

29

110

980

68

50

300

780

26

935

22

22

NSQ400-60-132

280

64

132

980

68

28

200

400

60

480

55

23

NSQ500-45-132

350

49

132

980

67

28

200

500

45

600

42

24

NSQ500-55-132

350

59

132

980

70

28

200

500

55

600

52

25

NSQ800-35-132

560

38

132

980

70

42

300

800

35

960

32

26

NSQ1000-22-132

700

27

132

980

71

50

300

1000

22

1200

17

27

NSQ650-52-160

455

56

160

980

65

28

200

650

52

780

44

28

NSQ600-55-200

420

59

200

980

62

28

250

600

55

720

50

29

NSQ800-55-220

560

60

220

980

66

38

300

800

55

960

50

30

NSQ1250-35-220

875

39

220

980

70

45

350

1250

35

1500

30

31

NSQ1500-35-250

1050

40

250

980

72

50

350

1500

35

1800

30

32

NSQ1750-30-250

1225

34

250

980

70

55

350

1750

30

2100

25

33

NSQ2000-35-315

1400

40

315

980

72

60

400

2000

35

2400

30

Products marked with √ are conventional products, products marked with ※ are modified products, the products marked with ★ are those which have drawings but have not been developed, and the custom and supply period of the undeveloped products is 45-60 days.


 
 

No.

Model

L
(mm)

L1
(mm)

L2
(mm)

A
(mm)

B
(mm)

C
(mm)

d
(mm)

1

NSQ30-30-7.5

842

700

296

605

390

396

80

2

NSQ50-21-11

913

738

300

606

406

405

100

3

NSQ100-18-11

913

738

300

606

406

405

100

4

NSQ50-26-15

950

774

300

640

385

422

80

5

NSQ60-30-15

950

774

290

632

385

422

100

6

NSQ100-18-15

950

774

300

640

385

422

100

7

NSQ150-15-15

990

814

340

620

410

455

150

8

NSQ150-22-22

1401

1135

535

883

630

568

150

9

NSQ200-15-22

1375

1110

507

870

630

551

150

10

NSQ150-30-30

1452

1144

425

832

630

605

150

11

NSQ300-20-37

1567

1170

510

1070

595

775

150

12

NSQ200-30-45

1699

1255

495

1006

665

650

150

13

NSQ150-45-55

1692

1248

488

1011

678

640

150

14

NSQ250-35-55

1699

1255

495

1006

665

650

150

15

NSQ600-15-55

1720

1275

515

1052

711

675

250

16

NSQ200-45-75

1904

1425

488

1011

678

640

150

17

NSQ400-25-75

1888

1410

485

1422

665

1047

200

18

NSQ500-25-90

1888

1410

485

1422

665

1047

200

19

NSQ400-50-110

2225

1550

500

1190

760

790

200

20

NSQ1000-18-110

2407

1725

626

1640

854

1207

300

21

NSQ780-26-110

2407

1725

626

1640

854

1207

300

22

NSQ400-60-132

2328

1665

520

1540

849

1117

200

23

NSQ500-45-132

2320

1656

472

1124

823

739

200

24

NSQ500-55-132

2320

1656

472

1124

823

739

200

25

NSQ800-35-132

2538

1784

601

1581

802

1177

300

26

NSQ1000-22-132

2465

1801

626

1640

854

1207

300

27

NSQ650-52-160

2673

1772

472

1124

823

739

200

28

NSQ600-55-200

2673

1772

472

1140

823

739

250

29

NSQ800-55-220

2934

1993

710

1686

900

1229

300

30

NSQ1250-35-220

2922

2021

730

2150

977

1630

350

31

NSQ1500-35-250

3012

2111

730

2150

977

1630

350

32

NSQ1750-30-250

3012

2111

730

2150

977

1630

350

33

NSQ2000-35-315

3235

2261

804

2260

1026

1730

400

 
Installation and Application Instruction
 

1、Preparation before Installation

1)Carefully check whether the electric pump is deformed or damaged in the processes of transport, storage and installation and whether the fastening pieces are loosened or fallen off before starting.

2)Check whether the cable is damaged or broken, if yes, replace the cable to avoid electric leakage.

3)Check whether the power source device is safe and reliable and that the rated voltage should accord with the nameplate.

4)Use a megohmmeter to check that the motor stator winding cold ground insulation resistance should not be less than 50MΏ.

5)Check whether the oil quantity in the oil chamber is appropriate and that the oil level of the unit in the vertical position should be flush with the oil filling opening.


6)Make sure that clear cold water is filled continuously when the submersible pump with the cooling shield is started, and make sure that the outlet is smooth and the cooling water flows in from one side of the lower end and flows out from the upper end of the other side.

2、Notices

After the pump is operated normally, please observe whether the voltage of the power source, the working current, the flow rate of the pump and the vibration of the pump are normal at any time. If one of the following conditions occurs, please immediately stop the machine to check:

1)The working current exceeds the rated current.
2)In the rated pump lift, the flow rate is reduced by more than 20% or the water outlet is discontinuous.
3)The voltage of the power source is overhigh or too low.
4)The pump has obvious vibration or noise.

3、Installation Notices

1)Electrical connection: the electrical connection should be carried out by professional electrician according to the circuit diagram, the insulation resistance should be detected at any time in the installation process, and the motor insulation resistance should not be less than 5MΏ after the installation is over. The pump is hung and subjected to inching turning, so as to observe its rotation direction, and the pump is rotated clockwise if a person looks downward from the motor direction. If the rotation direction is wrong, please replace any two connectors of the three phase power supply.

2)Prohibit using the cable of the pump as a rope for installation and hoisting, so as to avoid dangers.

3)The pump should be vertically submerged in water, should not be horizontally placed and fall into sludge, and the power source should be cut off when the pump is moved.

4、Storage Notices

1)The electric pump should be placed into clear water to rotate for several minutes after being used for many times, so as to prevent sediment from remaining in the pump and ensure the cleanness of the electric pump.

2)The electric pump should be taken out from water if not used for a long term, so as to reduce the occasion that the motor stator winding is affected with damp and prolong the service life of the electric pump.

3)Under normal working conditions, the electric pump should be maintained after working for a year, the worn wearing parts should be replaced, the tightening status should be checked, and the lubricating grease of the bearing and the insulating oil in the oil chamber should be replenished or replaced, so as to ensure good operation of the electric pump.

 
Application Cases
 
Sketch Map of Agitation Effect in Water
Safe Agitation Range of the Electric Pump with the Agitation Impeller
Yellow River Desilting Project
Sketch Map of DPB Electric Pump Platform Parallel Desilting Equipment
   
 

Causes of Faults and Countermeasures

 

Faults

Possible Causes

Solution

The current is overhigh and exceeds the rated current.

1. The pump is friction-resistant.

1. adjusting the clearance

2.The pump lift of the device is too low and the pump is operated in larger flow rate.

2. controlling the flow rate by the valve or replacing a pump with proper pump lift

3. The bearing is damaged.

3. replacing the bearing

The motor does not rotate and has noise when started.

1. The voltage is too low

1.adjusting the voltage to the rated value

2. The motor is rotated with single phase.

2. checking the lines and connecting the broken lines

3. The pump is blocked by foreign matters.

3. removing the foreign matters

4. The impeller rubs with the inner pump cover or the water suction plate.

4. adjusting the clearance of the impeller to normal value

The pump does not output water or output a small quantity of water.

1. The impeller rotates reversely.

1. changing any two phase power cords

2.Water strainer is blocked.

2. removing the blockage

3. The water inlet is exposed out of the water surface.

3. adjusting the pump to submerge the pump

4. Water pipe leaks or are leaked.

4. replacing the water pipe or removing the sludge

5. The actual pump lift is too high.

5. selecting a pump with proper pump lift

 

The insulation resistance is reduced to below 0.5 MΏ.

1. Cable connector is damaged.

1. treatingthe cable connector again

2. The stator winding insulation is damaged.

2. replacing the stator winding

3. Water enters the cavity of the motor.

3. removing the water content and drying the winding

4. The cable is damaged.

4. repairing the cable

The pump has unstable operation and serious vibration.

1. The impeller is worn seriously.

1. replacing the impeller

2. Impurities block the rotating parts.

2. clearing the impurities

3. The bearing is damaged.

3. replacing the bearing

 

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