What is the role of mechanical seals?

Date:Jul 17, 2018


First, improve machine efficiency and reduce energy consumption.

1. Reduce the internal leakage, leakage and leakage of the machine to improve the volumetric efficiency of the machine. For example, the Daqing Refinery changed the impeller ring of the coking 5FDJ5×2 centrifugal pump to a mechanical seal, which increased the pump efficiency by 3.6% to 5.6%.

2, reduce friction loss and improve the mechanical efficiency of the machine. For example, the double-face seal is changed to a single-end seal, the unbalanced type is changed to a balanced type, and the closed end of the double-supported bottom-reducing pump (so-called beheading pump) reduces the friction loss and improves the mechanical efficiency.

3, change the sealing method, improve the efficiency of the machine or unit. For example, the shield pump is changed to a mechanical seal pump to improve the efficiency of the motor. Use magnetic drive pumps to increase machine efficiency.

4, change the auxiliary system, reduce energy consumption, improve unit efficiency, for example, the hot oil pump from flushing to small impeller cycle flushing; double-face seal to single-end seal, saving energy consumption of the oil-sealing auxiliary system.

Second, save raw materials. For example, process fluid recovery reduces or eliminates the loss of power steam and process fluids, and reduces oil loss.

Third, improve machine reliability. For example, the leakage and life of the shaft seal determines the shaft seal and machine reliability.

Fourth, safety and environmental protection. According to a survey conducted by a Japanese factory, 32 of the 786 accidents were caused by leakage (42%). In addition, process fluid leakage can also cause environmental pollution, including air pollution, water pollution and environmental pollution in the workshop.

Mechanical seal refers to the prevention of fluid leakage caused by at least one pair of end faces perpendicular to the rotation axis under the action of the fluid pressure and the compensating mechanism elastic force (or magnetic force) and the auxiliary seal. Device.

The mechanical seal is a shaft seal device that resists leakage by a pair of pairs or pairs of end faces that are relatively slid relative to the shaft under the action of the fluid pressure and the elastic force (or magnetic force) of the compensating mechanism.

The common mechanical sealing structure consists of a stationary ring (static ring), a rotating ring (moving ring), an elastic element spring seat, a set screw, a rotating ring auxiliary sealing ring and a stationary ring auxiliary sealing ring, etc., and the anti-rotation pin is fixed on the gland. Upper to prevent the stationary ring from rotating.

Rotating rings and stationary rings can often also be referred to as compensating rings or non-compensating rings depending on whether they have axial compensation capabilities.

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