How to reduce the horizontal sectional multi-stage centrifugal pump balance disc wear?

a, horizontal sectional multi-stage centrifugal pump centrifugal pump to the role of balance disc

more balance disc used in multistage centrifugal pump axial force balance, working fluid as a liquid, the role of the centrifugal pump balance disc mainly automatic balancing axial thrust.

sectional multi-stage pump working principle of balance disc: out of the final stage with the pressure of liquid, through adjusting the set of radial ask before the gap flow into the balance disc cavity, the cavity under high pressure. Balance disc after balance are connected to the pump inlet pipe, the pressure approximation for the inlet pressure. Such balance disc pressure are not equal on both sides, as a result, the backward of axial thrust, namely the balance. Balance force and axial force on the contrary, thus automatically balance the axial thrust of the impeller. When impeller of axial thrust is greater than the force balance disc, the pump rotor will move to the side entrance, and due to the effect of inertia, this move will not immediately stop on the equilibrium position, but to beyond the limit, with balance disc axial gap caused by excessive reduce, reduce leakage, before the balance disc cavity pressure, so the balance tray balance force increases, and more than impeller of axial thrust, pull the rotor and toward the exit side have inertia of this process is the same, make the balance disc axial clearance increases, cause the balance is less than the axial thrust, the rotor and move to the side entrance, repeat the above process.

2, to reduce the horizontal method of sectional multi-stage centrifugal pump balance disc wear

1. Dish using the balancing drum and joint

there is no axial clearance, balance drum labyrinth seal/honey comb seal and balance of concave and convex chamfer drum radial radial clearance, can have better relief effect, high pressure gas flows through the balancing drum radial clearance after the balance into the cavity, then enter the balance tube connected to the entrance, the cavity pressure always equal or slightly higher than the inlet pressure, in order to achieve the purpose of the balance of axial force.

       2. Choose wear-resisting material

multistage pump series more, relative slender shaft, the static deflection is larger, easy, the phenomenon of the rotor and fixed parts touching one another, lead to unstable operation, vibration noise increases, the vulnerability of premature failure. To overcome this defect, we request manufacturers in the original design on the basis of more principal axis design size, make the spindle rigidity strengthen greatly, run more smoothly.

       3. Reduce the impurities in the conveying medium

often cleaning tank or water storehouse, filter, maximum limit reduce the content of impurities in medium. According to the characteristics of the medium, on the balance disc and balance of the multistage pump ring joint surface wear resistance, corrosion resistance and anti-friction resistance coating, at the same time adopt measures to reduce balancing water resistance, can effectively reduce the chamber pressure, greatly improve the reliability of the shaft sealing, reduce the leakage.

       4. Balance pipe

by horizontal sectional multi-stage pump pump axial force balance mechanism balance, balance balance device with liquid flow, balance the liquid by the balance pipes connected to suction section, or in a short tube, balance of outdoor design balance liquid by the short tube flow pump. In order to ensure the normal operation of pump, balance pipe is absolutely not allowed to jam.

       5. Avoid cavitation

in the process of water pump operation, to ensure a high enough level, avoid suction height is too big, so can not only avoid cavitation, and can improve the efficiency of the pump.

       6. Assembly adopts preload method

horizontal sectional multi-stage centrifugal water pump, and failed to solve for a long time of guide vane of out of stock rotation in the middle or small problem, we use the preloaded assembly method to solve, reduce the vibration and noise of the pump, the pump running more smooth and quiet.

       7. Strengthening the management of operation and maintenance, and strictly carry out operation procedures

start: turn the pump rotor, before starting the pump should check whether the rotor is flexible; Open pump suction valve, close the pump outlet pipe valve and pressure gauge cocks, had filled with liquid in the pump, or use the vacuum system to eliminate the air in the suction pipe and pump; Start the motor, after waiting for normal operation the pump, open the pressure gauge cocks, slowly open the pump discharge gate, until the pressure gauge pointer refers to the required pressure.

run: in the process of running, must pay attention to observe only readings, bearing heating, leakage of filling and heat, as well as the vibration and noise of the pump is normal, if discovery is unusual, should be timely treatment; Bearing temperature rise reflects the assembly quality of the pump, bearing temperature rise shall not be higher than ambient temperature 35 ℃, the highest temperature is not higher than 75 ℃; bearing Problems in the operation of the pump rotor in axial winding, axial movement should be within the scope of the permit, should guarantee the end of the motor and pump coupling gap value; q should be check regularly at run time, sealing rings, guide vane impeller, shaft sleeve, balance disc, such as wear and tear on parts, when excessive wear, should change in time.

parking: parking should be shut down before the pressure gauge cocks, slowly closing export gate, waiting for export network closed to end to stop the motor, pump stopped after the closing of the pump suction.

horizontal sectional multi-stage centrifugal pump of the balance disc is able to balance the axial thrust, depends on the centrifugal pump pressure difference on both sides of the balance disc, and able to take advantage of the position of the balance disc and balance with clearance changes automatically to maintain the pressure difference, generating force and axial thrust balance, this also is domestic multistage centrifugal pump the common principle of the balancing disc axial force.

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