What is the balance device of the multi-stage pump and what is its function

Category: Water pump knowledge

2024-07-29

multistage pumpIs a widely used in the field of fluid transport pumps, especially in the need to lift a large number of liquid height of the occasion to show superior performance, its internal structure, the balance device is a key component, its role and function in the normal operation of the pump to play a vital role.

The balance device of the multistage pump mainly includes the balance tube, the balance plate and so on. These components are designed to achieve a common goal, so that the axial force of the pump rotor to achieve a balanced state. When the multi-stage pump is working, the pressure and flow of the liquid will produce axial forces. If these forces are not balanced, it will affect the performance and service life of the pump.

According to the different working conditions used, there are three kinds of balance mechanism commonly used in multi-stage centrifugal pump: balance drum, balance disc and double balance drum (between balance disc and balance drum) structure, which are installed in the pump after the last stage impeller, with the rotor rotation. The number of different balancing mechanisms is different, the balance drum structure has only one gap, the balance disc structure has two gaps, and the double balance drum structure has three gaps. In addition, there is a self-balancing structure.

The balance disc is like a floating liquid lubricated bearing. The balance disc is different from the balance drum. It can automatically balance the axial force. This is because the two gaps of the balance disc complement each other.

During the working process of the pump, due to the change of the working point and the wear of the wear ring, the axial force also changes accordingly, and the rotor moves accordingly to achieve a new balance. However, due to inertia, the moving rotor will not stop at the equilibrium position immediately, but will not stop until it moves forward a little by inertia. This stop position has exceeded the equilibrium position and the rotor is to move back. It can be seen that the working process of the balance disc is in the process of motion balance, and the balance is temporary and relative.

The role of the balance device is mainly manifested in the following aspects:

1. Balance axial force: This is the most important function of the balance device. Through the design and adjustment of the balance device, the axial force inside the multi-stage pump can be effectively balanced to ensure the stable operation of the pump.

2. Improve the performance of the pump: When the axial force is balanced, the flow rate, head and other performance parameters of the pump will be more stable, thereby improving the efficiency of the pump.

3. Extend the service life: Due to the balance of the axial force, the various parts of the pump are evenly stressed, reducing wear and fatigue, thereby extending the service life of the pump.

4. Reduce noise and vibration: The balance device can reduce the vibration and noise caused by the imbalance of axial force, and make the pump run more smoothly.

5. Convenient maintenance: Through the balance device, the running status of the pump can be easily checked and adjusted, making maintenance simpler and more efficient.

In practical application, the design and adjustment of the balance device need to be carried out according to the specific model and working condition of the multi-stage pump. Different pumps may require different balancing device configurations and parameters. Therefore, when installing and using multi-stage pumps, it is necessary to strictly follow the manufacturer's instructions to ensure that the balancing device can exert maximum efficiency.

In general, the balance device of the multi-stage pump is a key component to ensure the stable operation of the pump. By balancing the axial force, improving the performance and service life of the pump, reducing noise and vibration, and facilitating maintenance, the balance device plays an important role in the multi-stage pump.

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