1. Basic knowledge of mechanical seals:

1. The basic concepts of mechanical seal:

Mechanical seal means that the at least one rotation axis perpendicular to the face in the fluid pressure and elastic compensation mechanism (or magnetic) and sealed under and assisted with the merger to maintain the relative sliding paste consisting of a device to prevent fluid leakage. Compensation for the auxiliary seal ring metal bellows mechanical seal, called bellows.

2. Mechanical seal consists of:

There are four main parts.
a. main seal: ring and static ring.
b. secondary seals: seals.
c. pressed parts: spring, thrust ring.
d. Transmission Parts: bomb Kei Block and key or screw

2. Mechanical seal should pay attention to the problem:

1. Installation notes

a. should be very careful to avoid installation of bias arising from the installation.
b. the amount of compression in accordance with the provisions of the spring, allowed the phenomenon of too large or too small to require error 2.00 mm. Had more than end the General Assembly to increase pressure, and the other end wearing fast. Too small will cause less than the pressure seal and can not play a role.
c. ring beard after installation to ensure flexibility in axis movement, will ring after compression to the spring should be able to automatically bounce back.

2. Disassembly Note

a. In the demolition of the mechanical seal carefully, is strictly prohibited to use hand-hammer and flat shovel to avoid damaging the sealing components. Do a pair of wire hook, stuck in the self-direction transmission Block notch, pull out the sealing device. If the scale demolition of no less than should be cleaned before demolition.
b. If the pump mechanical seal both ends of the time, in the assembly, disassembly process of mutual care, prevention of at a loss.
c. mechanical seal on the run-off, where a gland seal loose to shift the case, then the static ring parts must be replaced, not re-tighten the continued use. Because of the kind of dynamic Ying, the friction pair had run track changes occur, it is easy to seal contact surface destruction.

3. Mechanical seal for normal operation and maintenance issues:

1. Preparation before the start of work and attention to issues

a. comprehensive inspection of mechanical seals and ancillary equipment and pipeline installation is complete, compliance with technical requirements.
b. Static pressure seal test before start, check whether the mechanical seal leakage. If the leak more reason should be investigated to eliminate. If still ineffective, should be demolished and re-install checks. Hydrostatic test pressure normally used 2 to 3 kg / square centimeter.
c. by pump rotation plate car, check for light evenly. Such as the car difficult or fixed disk, the assembly should check whether the size of the error, the installation is reasonable.

2. Installation and decommissioning

a. shall remain sealed before the start of fluid-filled cavity. Solidification of the medium for transmission, the application of steam to the sealed chamber heated to medium melt. Must be set before the start of vehicle to prevent sudden start caused by soft ring fragmentation.
b. For use outside the seal oil system pump mechanical seal, seal oil system should start. After stopping the last stop seal oil system.
c. heat pump can not immediately stop after the shutdown seal chamber and seal oil cooling water, wait until the seal oil temperature dropped to 80 degrees below office only when the cooling water can be stopped, so as not to damage the sealing parts.

3. Operation

a. If the pump starts minor leakage should be observed for some time. Such as 4 hours continuous operation, leakage is still not reduced, they should check the pump stops.
b. pump operating pressure should be steady, the pressure fluctuation is less than 1 kg / square centimeter.
c. pump in operation, it should avoid taking the time to the phenomenon, so as to avoid friction and sealing the sealing surface damage.
d. Always check the seals. Operation, when the leakage exceeds the standard, heavy oil is not more than 5 drops / min, light oil is not greater than 10 / min, such as 2-3 days, still no signs of improvement, it should stop the pump bolt inspection seal.

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