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What is the function of return pipe of horizontal multistage
Source:未知|Popularity:0|release date:2020-03-16 15:36:54
The balance disk device is composed of balance ring and balance disk. Its working principle is: the liquid with pressure from the last stage impeller flows into the water chamber between the balance plate and the balance plate through the radial clearance between the balance plate and the balance plate, so that the water chamber is in a high pressure state. After the balance disk, there is a balance pipe connected with the inlet of the pump, and its pressure is approximately the inlet pressure of the pump. In this way, the pressure on both sides of the balance plate is not equal, thus generating a backward axial thrust. The magnitude of the axial balance force changes with the change of the axial displacement, the adjustment of the axial clearance between the balance disk and the balance ring (that is, the change of the water chamber pressure between the balance disk and the balance ring), so as to achieve the purpose of balance. But this balance is often dynamic.
The liquid with pressure from the last stage flows into the cavity in front of the balance disk through the radial gap between the balance ring and the balance disk, and the cavity is in a high pressure state. After the balance disk, there is a balance pipe connected with the pump inlet, and its pressure is approximately the inlet pressure. In this way, the pressure on both sides of the balance plate is not equal, thus generating a backward axial thrust, that is, the balance force. The balance force is opposite to the axial force, so it automatically balances the axial thrust of the impeller. When the axial thrust of the impeller is greater than the balance force of the balance plate, the pump rotor will move towards the inlet side, and due to the inertia, this movement will not stop at the balance position immediately, but will exceed the limit, resulting in the rapid excessive reduction of the axial clearance of the balance plate, reducing the leakage, increasing the pressure of the cavity in front of the balance plate, so the balance force on the balance plate will increase and exceed The axial thrust of the impeller pulls the rotor to the outlet side. The same process has inertia, which increases the axial clearance of the balance disk, causes the balance force to be less than the axial thrust, and the rotor moves to the inlet side, repeating the above process. This process is automatic. When the pump is working, the rotor always moves axially in a certain balance position, but the displacement is very small, which is hard to see from the appearance.
So it can be seen from the above that the function of the return pipe (balance pipe) is as follows:
1. The high-pressure end and low-pressure end (inner cavity water pressure) of the multistage pump are balanced by the balance water pipe. Keep a dynamic balance in the internal cavity of the pump.
2. When the pump starts to fill with water, the water in the pipe can self lubricate the balance device.
3. Reduce the disc loss of the pump.
The liquid with pressure from the last stage flows into the cavity in front of the balance disk through the radial gap between the balance ring and the balance disk, and the cavity is in a high pressure state. After the balance disk, there is a balance pipe connected with the pump inlet, and its pressure is approximately the inlet pressure. In this way, the pressure on both sides of the balance plate is not equal, thus generating a backward axial thrust, that is, the balance force. The balance force is opposite to the axial force, so it automatically balances the axial thrust of the impeller. When the axial thrust of the impeller is greater than the balance force of the balance plate, the pump rotor will move towards the inlet side, and due to the inertia, this movement will not stop at the balance position immediately, but will exceed the limit, resulting in the rapid excessive reduction of the axial clearance of the balance plate, reducing the leakage, increasing the pressure of the cavity in front of the balance plate, so the balance force on the balance plate will increase and exceed The axial thrust of the impeller pulls the rotor to the outlet side. The same process has inertia, which increases the axial clearance of the balance disk, causes the balance force to be less than the axial thrust, and the rotor moves to the inlet side, repeating the above process. This process is automatic. When the pump is working, the rotor always moves axially in a certain balance position, but the displacement is very small, which is hard to see from the appearance.
So it can be seen from the above that the function of the return pipe (balance pipe) is as follows:
1. The high-pressure end and low-pressure end (inner cavity water pressure) of the multistage pump are balanced by the balance water pipe. Keep a dynamic balance in the internal cavity of the pump.
2. When the pump starts to fill with water, the water in the pipe can self lubricate the balance device.
3. Reduce the disc loss of the pump.