What is the difference between a balance drum and a balance disc

Balance the axial direction with a balance hub.

force, will definitely use thrust bearings.

If thrust bearings are used, it is not possible to have a large axial channeling. Unlike a balance drum, the balance disc automatically balances the axial forces because the two clearances of the balance disc (radial clearance and axial clearance) complement each other. The balance disc changes the balance force by the pressure difference generated by leakage.

Without leakage, a complete equilibrium of axial forces cannot be achieved. The working process of the balance disc is a process of movement balancing. With a balance plate, a certain amount of channeling is required in the axial direction. Therefore, the phenomenon that the balance disc and the balance hub are used together on the same pump generally does not occur.

There are the following differences between a balance drum and a balance disc:

The balance drum is a notched ring that changes its equilibrium state due to its axial motion when it balances the rotation of the machine. Specifically, the balance drum can automatically balance the axial force, but this balancing effect cannot fully balance the axial force.

In contrast, the principle of operation of a balance disc is a bit more complicated. The balance disc automatically balances the axial forces, thanks to the complementarity of its two clearances. One of the gaps is the radial clearance, which mainly affects the radial vibration of the machine; Another clearance is the axial clearance, which mainly affects the axial vibration of the machine.

This balancing process is a dynamic equilibrium process.

In general, balance drums and balance discs have different operating mechanisms and effects when balancing the rotation of a machine. The specific application depends on the specific requirements of the machine.

What is a water pump balance drum, balance plate?

Balance drums. A balance drum is a cylinder.

It is mounted after the final impeller and rotates with the rotor. A radial cavity gap is formed between the balance drum and the balance sleeve. In front of the balance drum is the rear cavity of the Suezhen Chunda impeller, and behind it is the balance chamber connected to the suction inlet.

In this way, the pressure difference acting on the balance drum forms a balance force pointing to the right.

f, this force is used to balance the axial direction acting on the rotor.

Force a. Because the balance drum is not completely in line with the actual or working conditions change when the calculation is not completely in line with the actual or working conditions, the balance force generated by the balance drum cannot be completely equal to the axial force, and the residual axial force is determined by the thrust bearing.

to bear. The gap between the balance drum and the balance sleeve is often taken The leakage of the balance drum is large, about 5% of the flow rate at the design point 25%.

Balance discs. The balance disc is like a floating liquid lubricated bearing, with the rotor can move (the pump with the balance disc device, the bearings at both ends are not limited to axial movement), the balance disc and the balance drum are different, it can automatically balance the axial force, this is because the two clearances of the balance disc complement each other.

The leakage of the balance plate is very large, the leakage of the general pump is 4% 10% of the design flow rate of the pump, and the pump with high head and small flow rate is as high as 20%. When the operation is worn out for a period of time, the leakage will increase. Factors influencing the amount of leakage:

For a certain balance plate, the larger the stage, the greater the leakage. The pump operates in a small flow area and the leakage increases. When B1 is large, the leakage is large.

Large leakage in l1 hour. B2 increases and the leakage is large.