What is a high-speed mechanical seal and its characteristics

When the average linear velocity of the sealing end faces of the mechanical seal exceeds 30m/s, it is called a high-speed mechanical seal. At present, the seals of high-speed pumps and centrifugal compressors are high-speed mechanical seals. Some high-speed pumps are vertical, and rely on gear transmission to achieve high speed. Generally, it is 10,000 to 20,000 r/min, and some exceed 20,000 r/min. The shaft diameter is not very large, about ∅40mm, and the linear speed of the sealing surface is 30 ~50m/s.

There are many types of shaft seals for centrifugal compressors, and mechanical seals can be used under low pressure. The rotational speed of the centrifugal compressor is 8000~14000r/min, the shaft diameter is larger, generally above ∅100mm, and the linear speed of the friction pair of the mechanical seal is much higher than that of the high-speed pump, at 50~90m/s. Therefore, its high-speed characteristics are more prominent.

The high-speed mechanical seal has the following characteristics: the sealing structure adopts multi-spring, static and balanced seal; the power consumption is relatively large, and the stirring power is greater than the friction power of the sealing end faces of the mechanical seal. In order to reduce power consumption, the width of the sealing surface of the mechanical seal is small (3mm), and the diameter of the rotating part should be reduced as much as possible: the followability of the stationary seat assembly is poor, and the leakage is large. To improve the followability, the mass of the stationary seat should be small and the Spring specific pressure should be larger; The installation requires high technical requirements, especially the verticality between the rotary face end face and the shaft is controlled within 5 μm. In addition, the technical requirements for the installation of the machine itself are relatively high. For example, the amount of shaft string is not more than 0.30mrn, the rotor balance is better, the vibration during operation is small, and the seal between the sealing box and the machine must be reliable, etc.

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