The myth - small centrifugal pump mechanical seal repair

1, the greater the spring compression, the better sealing effect

this is not the case. Excessive compression spring can lead to sharp wear and friction pair instant combustion. Excessive compression spring lose the ability of adjusting mobile ring end face, lead to small centrifugal water pump seal failure.

2, mobile ring sealing figure as tight as possible

in fact, tighten ring sealing ring is too tight can be harmful, is also useless. One is the increase of wear between seal and shaft sleeve, prematurely leak; Secondly, it increases the axial adjustment and mobile to mobile ring resistance, when working conditions change frequently, this resistance can't adjust in time. Third, the spring is too tired, easy to damage. Four is ring seal deformation, affect the sealing effect.

3 and static ring sealing tight the better

static ring sealing ring in static state, the basic relatively tight sealing effect will be better, but too fast is harmful. One is leading to excessive deformation and static ring sealing effect sealing effect; Second, static ring is mainly composed of graphite graphite, usually fragile, easily broken due to excessive stress. Third, install and remove the difficulty, the static ring is easy to damage.

4, multistage small centrifugal pump impeller lock mother as tight

shaft sleeve and the shaft leakage between ( The leakage of the shaft between) A very common in the mechanical seal leakage. Generally considered the leakage of the shaft between the impeller lock nut no lock. In fact, there are lots of factors lead to the leakage of the shaft between such as cushion between shaft failure, offset, impurities between shaft, shaft and shaft sleeve joint shape and position error, contact surface damage, clearance between shaft parts, shaft thread is too long, etc. All of these will lead to leakage between shaft. Lock the mother excessive locking will only lead to shaft between pad premature failure. Mother, on the other hand, the appropriate lock lock will remain between the shaft pad has a certain compression elasticity. Operation process, lock the mother will automatically lock in time, keep good seal cushion between the shaft.

5, the new is better than the old.

relatively small centrifugal pump using new was better than the old mechanical seal mechanical seal, but the quality of the new mechanical seal or material choice, not in time to match the size error of the impact on the sealing effect is bigger than the assembly. In polymer and permeability medium, had better not without excessive wear of the change of static ring. Due to the static ring at the medium and long term static ring in static state, the polymer and the sediment into an organic whole, have played better sealing effect.

6, demolition and repair is better than not to dismantle the

small centrifugal water pump mechanical seal leakage, need to dismantle and repair. In fact, sometimes the seal was not damaged, only by adjusting the working conditions or adjust seal can eliminate the leakage. This not only can avoid the waste, but also can verify their fault judgment, maintenance experience, improve the quality of maintenance.

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