The centrifugal pump is designed according to the principle of centrifugal force. The high-speed rotating impeller blades drive the water to rotate and throw the water out to achieve the purpose of conveying. There are many kinds of centrifugal pumps, which can be divided into civil and industrial pumps from the use; from the conveying medium, they can be divided into clean water pumps, impurity pumps, and corrosion-resistant pumps.
1. Stable operation: The absolute concentricity of the pump shaft and the excellent dynamic and static balance of the impeller ensure smooth operation without vibration.
2. No leaking water: Carbide seals of different materials ensure no leakage in different media.
3.
1. Pipeline centrifugal pump for conveying clean water and other liquids with similar physical and chemical properties to clear water. It is suitable for industrial and urban water supply and drainage, pressurized water supply for high-rise buildings, garden irrigation, fire booster and supporting equipment. Equal to 80 degrees Celsius.
2. Hot water (high temperature) circulation pumps are widely used in energy, metallurgy, chemical, textile, papermaking, and hotels and other boilers for high-temperature hot water pressurized circulation transmission and urban heating system circulation pumps. The ISWR operating temperature T is less than 120 degrees , WRG use temperature T is less than or equal to 240 degrees Celsius.
3.Horizontal chemical pump for liquids containing no solid particles, corrosive, and viscosity similar to water, suitable for petroleum, chemical, metallurgy, electric power, papermaking, food, pharmaceutical and
Main advantages: simple structure, convenient maintenance, fixed installation without vibration, better sealing, low noise, convenient maintenance, and cheap price;
Main disadvantage: due to horizontal
With the continuous development of the economy, centrifugal pumps have become more and more widely used in production engineering due to their strong sewage discharge capacity, high efficiency and energy saving, and good self-priming performance. According to professionals of pneumatic double diaphragm pumps, the current market of self-priming magnetic pumps is very optimistic.
Not only for urban environmental protection,
Reasonable pump selection requires comprehensive consideration of comprehensive technical and economic indicators such as the investment and operating costs of pump units and pumping stations, so as to comply with the principles of economy, safety, and applicability. It includes the following aspects:
1) The pump with high efficiency, low noise and energy saving should be selected, and it is strictly forbidden to choose products to be eliminated.
2). Pumps should be selected according to the design flow and required lift, and the pump output should be reduced due to wear and other reasons. Pumps can be selected based on the calculated lift H multiplied by a coefficient of 1.05 to 1.10; the characteristic curve should be selected to increase with flow. Large pumps whose heads are gradually decreasing. Such pumps work stably and are reliable when working in parallel; and the operating point of the pumps should be maintained in the high-efficiency zone, which saves energy and does not easily damage the parts.
3) When there is no regulating facility in the water supply network, it is advisable to use a speed-regulating pump set or a rated speed pump set to run the water supply. The maximum water output of the pump set should not be less than the design flow of the community water supply, and it should be checked by fire fighting conditions.
4) Selecting the water tank and water tower lifting pump should reduce the number of pumps as much as possible, one should be used for one reserve; when a single pump can meet the requirements, it should not be used in parallel; if multiple parallel operation or large and small pumps must be used In the mode, the number of models and the number of units should not be too many. Generally, the number of models should not exceed two. The lift range of the pumps should be similar. When parallel operation, each pump should still run in the high-efficiency zone.
1) Before the pump is in place, the following review should be made; the size, location and elevation of the foundation should meet the design requirements; the equipment should not be missing, damaged and rusted; the protection at the nozzle and the cover should be intact; Flexible, no blocking, jamming, no abnormal sound.
2) The parts that have been assembled and debugged at the factory should not be disassembled randomly.
3), leveling of pump installation.
The height of the water pump foundation above the ground should be convenient for water pump installation and should not be less than 0.1m. After the pump is transported to the specified location, carry out equipment hoisting and installation, which is accurately located on the basis of the completed equipment. Then put on the anchor bolts and nuts, place the horn under the base, and initially level the level with a spirit level. Fill concrete.
Wait
1) Product standards
"Technical Conditions for Centrifugal Pumps (Class I)" GB / T 16907-1997
"Technical Conditions for Centrifugal Pumps (Class II)" GB / T 5656-1994
"Technical Conditions for Centrifugal Pumps (Type III)" GB / T 5657-1995
Pipeline Centrifugal Pump JB / T 6878-2006
"Cavitation Margin of Centrifugal Pump, Mixed Flow Pump and Axial Flow Pump" GB / T 13006-1991
"Specification of Hydraulic Performance Test Specification for Centrifugal Pumps, Mixed-Flow Pumps and Axial-Flow Pumps" GB / T 18149-2000
Overall Dimensional Tolerance of Rotary Dynamic Pumps EN 735-1995
"Centrifugal pump, mixed flow pump and axial flow pump hydraulic performance test specification precision level" EN ISO 5198-1998
"Technical Conditions for Centrifugal Pumps Class I" EN ISO 9905-1997
"Technical Conditions for Centrifugal Pumps Type II" EN ISO 5199-2002
"Technical Conditions for Centrifugal Pumps Type III" EN ISO 9908-1997
"Liquid Pump Pump Equipment Assurance and Compatibility Test with Frequency Converter" EN12483-1999
"Swing Power Pump Acceptance Test Grades 1 and 2" EN ISO 9906-1999
Technical Specifications for Rotary Positive Displacement Pumps EN ISO 14847-1999
2) Engineering standards
"Code for Construction Quality Acceptance of Building Water Supply and Drainage and Heating Engineering" GB 50242-2002
"Code for Design of Water Supply and Drainage in Buildings" GB 50015-2003
3), related standards
95SS103 "Isolation and Installation of Vertical Pump"
Numbering
model
flow
flow
Head
effectiveness
Rotating speed
Motor Power
Cavitation allowance
1001
15-80
1.1
1.5
2.0
0.30
0.42
0.55
8.5
8
7
26
34
34
2800
0.18
2.5
1002
20-110
1.8
2.5
3.3
0.5
0.69
0.91
16
15
13.5
19
34
35
2800
0.37
2.5
1003
20-160
1.8
2.5
3.3
0.5
0.69
0.91
33
32
30
19
25
twenty three
2800
0.75
2.5
1004
25-110
2.8
4
5.2
0.78
1.11
1.44
16
15
13.5
34
42
41
2900
0.55
2.5
1005
25-125
2.8
4
5.2
0.78
1.11
1.44
20.6
20
18
28
36
35
2900
0.75
2.5
1006
25-125A
2.5
3.5
4.5
0.69
0.97
1.25
17
16
14
35
2900
0.75
2.5
1007
25-160
2.8
4
5.2
0.78
1.11
1.44
33
32
30
twenty four
32
33
2900
1.5
2.5
1008
25-160A
2.5
3.5
4.5
0.69
0.97
1.25
29
28
26
31
2900
1.1
2.5
1009
32-125
4.5
4
6.5
1.25
1.39
1.58
20.5
20
18
29
38
38
2900
0.75
2.5
1010
32-125A
3.3
4.5
5.7
1.22
1.75
2.31
17
16
14
37
2900
0.75
2.5
1011
40-100
4.4
6.3
8.3
1.11
1.53
1.94
13.2
12.5
11.3
48
54
53
2900
0.55
2.5
1012
40-100A
4
5.5
7
1.22
1.75
2.31
10.6
10
9
47
52.6
54
2900
0.37
2.5
1013
40-125
4.4
6.3
8.3
1.11
1.53
1.94
20.5
20
18.5
36
46
43
2900
1.1
2.5
1014
40-125A
4
5.5
7
1.22
1.75
1.94
16.3
16
15.5
40
44
42.5
2900
0.75
2.5
1015
40-160
4.4
6.3
8.3
1.22
1.75
2.31
33.2
32
30.2
34
40
42
2900
2.2
2.5
1016
40-160A
4
5.5
7
1.11
1.53
1.94
29
28
26.6
33
38
39
2900
1.5
2.5
1017
40-160B
3.5
5
6.5
0.97
1.39
1.80
25
twenty four
22.5
31.5
37
39
2900
1.1
2.5
1018
40-200
4.4
6.3
8.3
1.22
1.75
2.31
50.5
50
48
26
33
35
2900
4.0
2.5
1019
40-200A
4
5.5
7
1.11
1.53
1.94
44.6
44
42.7
26
31
32
2900
3.0
2.5
1020
40-200B
3.5
5
6.5
0.97
1.39
1.80
39
38
36
29
2900
2.2
2.5
1021
40-250
4.4
6.3
8.3
1.22
1.75
2.31
82
80
74
twenty four
27.5
28
2900
7.5
2.5
1022
40-250A
4
5.5
7
1.11
1.53
1.94
72.5
70
65
twenty four
26
24.5
2900
5.5
2.5
1023
40-250B
3.5
5
6.5
0.097
1.39
1.80
63
60
55
25
2900
4.0
2.5
1024
40-100 (I)
8.8
12.5
16.3
2.44
3.47
4.53
13.6
12.5
11.3
55
62
60
2900
1.1
2.5
1025
40-100 (I) A
8
11
14
2.22
3.05
3.89
10.5
10
9
60
2900
0.75
2.5
1026
40-125 (I)
8.8
12.5
16.3
2.44
3.05
3.89
21.5
20
17.8
49
58
58
2900
1.5
2.5
1027
40-125 (I) A
8
11
14
2.22
3.05
3.89
17.0
16
14.3
56
2900
1.1
2.5
1028
40-160 (I)
8.8
12.5
16.3
2.44
3.47
4.53
33.3
32
29.8
45
52
53
2900
3.0
2.5
1029
40-160 (I) A
8
11
14
2.22
3.05
3.89
29
28
26.2
43
48
47
2900
2.2
2.5
Failure phenomenon
cause of issue
elimination method
1.The horizontal centrifugal pump does not produce water
a. The inlet and outlet valves are not open, the inlet and outlet pipelines are blocked, and the flow channel
Impeller blocked.
b. The motor is running in the wrong direction, and the speed of the motor lacking phase is very slow.
C. Leakage in the suction pipe.
d. The horizontal centrifugal pump is not filled with liquid and there is air in the pump cavity.
e. Insufficient water supply at the inlet, too high suction stroke, and leakage at the bottom valve.
f. The pipeline resistance is too large and the pump selection is improper.
a. Check and remove the obstruction.
b. Adjust the direction of the motor and tighten the motor wiring.
C. Tighten each sealing surface to eliminate air leakage.
d. Fill the liquid and open the exhaust valve to exhaust the air.
e. Stop, check and adjust (this phenomenon is easy to occur when the pipe is connected to the grid or used with suction).
f. Reduce pipeline bends and reselect the pump.
2.Insufficient flow of horizontal centrifugal pump
a. Press 1. Cause check.
b. The impeller of the flow channel of the pipeline and the horizontal centrifugal pump is partially blocked, and the scale is accumulated.
Insufficient valve opening.
C. The voltage is too low.
d. Impeller wear.
a. Press 1. exclude.
b. Remove the obstruction and readjust the valve opening.
C, voltage regulation.
d. Repair or replace the impeller.
3.The power of the horizontal centrifugal pump is too large
a. Use over the rated flow.
b. Suction is too high.
C, horizontal centrifugal pump bearing wear.
a. Adjust the flow and close the small outlet valve.
b. Decrease.
C. Repair or replace bearings.
4.Noise vibration of horizontal centrifugal pump
a, the pipeline support is unstable.
b. Liquid is mixed with gas.
C. Generate
The energy-saving and consumption-reduction of water pumps should be continuously explored under the condition of combining theory and practice, boldly citing new technologies, and looking for more reasonable and economical energy-saving measures.
During the operation of the pump, the water flowing in the pump is affected by its friction with the flow channel and the surface of the pump impeller and the viscosity of the water itself. The energy consumed by the pump is mainly used to resist the flow friction and eddy resistance on the water surface. The energy (head loss) consumed by water during the flow process is used to overcome internal friction and friction between the water and the device interface.
If the surface of the pump and impeller is smooth (this kind of surface is called hydraulic smooth surface), the surface resistance is small, and the energy consumption is small.
