What Are Axial Flow Pumps?

Axial flow pumps rely on the action of the blades of the rotating impeller on the liquid to transport the liquid along the axial direction. There are several types of pumps including vertical, horizontal, oblique, and cross-flow. China has developed a total of 664 sets of large-scale axial flow pumps since 1961. Its specific revolutions n are 500, 700, 850, 1000, 1250, 1400, 1600, etc .; the diameter of the wheel is 1.6m, 2.0m, 2.8m, 3.0m, 3.1m, 4.0m and 4.5m. In Jiangsu, Hubei, Hunan, Anhui, Guangdong, Tianjin, Shandong, Shanxi, Shaanxi, Xinjiang and other 16 provinces, municipalities and autonomous regions, a total of 114 large-scale axial flow pumping stations have been built with a total installed capacity of 630,000 kW.

Axial flow pump

Chinese name: Axial flow pump
Foreign name: Axial flow pump

Advantages: Heavy traffic
Species: Vertical, horizontal, inclined and cross flow

The axial flow pump impeller is equipped with 2 to 7 blades and rotates in a circular tube-shaped pump casing. The pump casing at the upper part of the impeller is equipped with fixed guide vanes to eliminate the rotating operation of the liquid.

1. It can transport clean water and mild sewage, the temperature of the medium can reach 40 , and the pH value is 4-10;

2. Excellent water conservancy model, well-made, ensuring the performance requirements of users;

3. Double mechanical seal to reliably prevent water leakage. Due to the large axial force of large pumps, special thrust bearings are used. The structural design is reasonable, the lubrication is sufficient, the heat dissipation is good, and the bearing has a long service life.

4. The motor adopts F-class insulation, high temperature resistance, and is equipped with alarm devices such as temperature protection, monitoring and leakage

5. It can be equipped with one-control two-to-one-control four control mode electric control cabinet, which can realize the automatic shutdown of the pump when the failure occurs, and the automatic start of the standby pump; reserve the fault signal (self-diagnosis) and other functions to ensure high reliability of operation

6. The submersible pump is submerged in water, with good cooling conditions, good running balance of the submersible pump, stable, low vibration and low noise;

7. Users can design underground pumping stations according to their needs to improve the environment.

8. The scale of the pumping station is small, the civil construction and building structure are simple, and the investment is greatly reduced, which can save 30% -40% of the cost of the pumping station project;

9. Machine-pump integration, saving time and labor in installation and maintenance, saving costs;

10. The products are in series, the water pump has a high-efficiency area, meets the user's working conditions, is highly efficient and energy-saving, and has low operating costs;

11. Convenient management, small management and low operating cost;

12, easy to achieve remote control and unattended.

Among them, vertical axial flow pumps mainly rely on the lift of the blades to guide the fluid to the outlet, which are axially in and axially out, and have the advantages of large flow.

It is assumed that this wing is suspended in fluid. When the fluid flows at a certain speed, negative pressure occurs on the airfoil surface and positive pressure occurs on the wing back. Angle of inclination) and the magnitude of fluid velocity.

If the fluid does not move and the wing is moving in the fluid at the same speed, the wing back and the airfoil are subject to the same positive and negative pressure as before, that is, the airfoil (above the wing) is negative pressure . The wing will gain lift under this pressure.

If the wing-shaped blade is fixed on the rotating shaft to form a propeller, and it cannot be moved in the axial direction, when the rotating shaft rotates at a high speed, the airfoil (lower side of the propeller) has a suction effect due to negative pressure. There is a drainage effect due to the positive pressure, so that one suction and one row causes the flow of liquid (or gas). This is how the axial flow pump works.

1. During trial operation, check the connection parts to ensure that there is no looseness in each connection part.

2. Electrical appliances and meters work normally; there must be no leakage in the pipelines of oil, gas and water systems; pressure and hydraulic pressure are normal.

3. Always check whether there are floating objects near the water inlet to prevent the water inlet from being blocked.

4. The temperature of the rolling bearing of the axial flow pump should not be greater than 75 degrees.

5. Pay attention to the sound and vibration of the pump at any time, and immediately stop the machine for inspection if any abnormality is found.

6. The temperature of the oil in the gearbox should be normal.

1. Flow rate: 700 89842 m3 / h

2. Head: 0.92 15.5 m

3. Power: 15 1400KW

4. Voltage: 380V, 660V, 6kV, 10kV

Axial flow pump models are generally classified according to the caliber and head classification models:

Example: 200ZL-2.5 means an axial flow pump with a diameter of 200mm and a head height of 2.5m

350ZLH-3000 means an axial flow pump with a diameter of 350mm and a height of 3000mm

Common models are:

100ZL-1.8, 150ZL-1.5

200ZL-1.5, 200ZL-2.0, 200ZL-2.5, 200ZL-3.0, 200ZL-3.5

250ZL-1.5, 250ZL-2.0, 250ZL-2.5, 250ZL-2.8, 250ZL-3.0, 250ZL-3.5, 250ZL-4.0, 300ZLH-2500, 300ZLH-2800, 300ZLH-3500

350ZLH-2130, 350ZLH-3000, 350ZLH-3500, 350ZLH-4000, 350ZLH-4500

400ZLH-2130, 400ZLH-2500, 400ZLH-2800, 400ZLH-3000, 400ZLH-3500

Note: ZL / ZLH / ZLB are often interchangeable

Additional classifications: ATQZB350, ATQZB500, ATQZB600, ATQZB700, ATQZB800, ATQZB900, ATQZB1000, ATQZB1200, ATQZB1400, ATQZB1600

What Are Axial Flow Pumps?

Axial flow pump

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