According to the national standard GB 5894-1986 "Terminology of Mechanical Seals", the noun terms applicable to mechanical seals for rotating shafts and their classification terms are defined as follows.
1.Mechanical seals (face seals).
It is a device to prevent fluid leakage composed of at least a pair of end faces perpendicular to the axis of rotation under the action of fluid pressure, elastic force (or magnetic force) of the compensation mechanism and auxiliary seal, keeping it close and sliding relatively.
2.Hydrodynamic mechanical seals
The seal end face is designed with a special geometry and uses a mechanical seal that produces a hydrodynamic pressure effect with relative rotation lines.
3.Hydrostatic mechanical seals
The seal face is designed with a special geometry to generate a hydrostatic effect using an externally referenced pressure fluid or the pressure drop of the sealed medium itself through the seal interface.
4.Non-contact mechanical seals (controlled diaphragm mechanical seals).
A general term for dry gas seals, hydrodynamic mechanical seals, and hydrostatic mechanical seals.
5.Built-in mechanical seals
A mechanical seal fitted with a stationary ring on the inside of the sealing end cap (or equivalent to the sealed end cap) (i.e., the side facing the working chamber of the main unit).
6.Externally mounted mechanical seals
A mechanical seal with a stationary ring mounted on the outside of the sealing end cap (or equivalent to the sealing end cap) (i.e., the side facing away from the working chamber of the main engine).
7.Internal flow mechanical seals
A mechanical seal in which the leakage direction of the sealing fluid between the seal ends is opposite to the direction of centrifugal force.
8.External flow mechanical seals
A mechanical seal in which the sealing fluid leaks in the same direction as the centrifugal force between the seal ends.
9.Spring-loaded mechanical seals
A mechanical seal in which an elastic element rotates with a shaft.
10.Spring-standing mechanical seals
A mechanical seal in which the elastic element does not rotate with the shaft.
11.Single-spring mechanical seal
The compensation mechanism contains only one spring-loaded mechanical seal.
12.Multi-spring mechanical seals
A mechanical seal containing multiple springs in the compensating mechanism.
13.Unbalanced mechanical seals
Mechanical seal with load factor k 1.
14.Balanced mechanical seals
Mechanical seal with load factor k 1.
15.Single-acting mechanical seal
A mechanical seal consisting of a pair of sealed end faces.
16.Double-acting mechanical seals
A mechanical seal consisting of two pairs of sealing faces.
17.Tandem mechanical seals
A mechanical seal consisting of two or more sets of single-acting mechanical seals arranged in the same direction.
18.Rubber bellows mechanical seal
The auxiliary seal of the compensation ring is a mechanical seal of rubber bellows.
19.PTFE bellows mechanical seals
The auxiliary seal of the compensation ring is a mechanical seal of the PTFE bellows.
20.Metal bellows mechanical seals
The auxiliary seal of the compensation ring is a mechanical seal of a metal bellows.
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