What are the working principles of mechanical seal

Mechanical seal is a device to prevent fluid leakage consisting of at least one pair of end faces perpendicular to the axis of rotation under the action of fluid pressure and compensation mechanism elasticity (or magnetic force) and the cooperation of the auxiliary seal to maintain the fit and relative sliding. Do you really understand mechanical seals? Let's learn more about mechanical seals today.

This passage is going to talk about the followings of mechanical seal:

1) What is mechanical seal?

2) Introduction of mechanical seal

3) Principles

 

1) What is mechanical seal?

A mechanical seal is a device that helps to prevent leaks by coming together (for example, in a joining system or a mechanism pumping system), which contains pressure, or excludes contamination. The effectiveness of the seal depends on the adhesion of the sealant and the compressibility of the gasket. Fixed seals can also be referred to as "packing". Each mechanical seal can only be effective if it is used within the specified limits. Improper selection can result in a significant reduction in seal performance, shortened life, or even failure.

 

2) Introduction of mechanical seal

"Mechanical seal" is often referred to as "machine seal".

Mechanical seal is a kind of shaft sealing device for rotating machinery. They are used in equipment such as centrifugal pumps, centrifugal machines, reactors and compressors. Since the drive shaft runs inside and outside the equipment, there is a circumferential gap between the shaft and the equipment, through which the medium in the equipment leaks outward, and if the pressure inside the equipment is lower than atmospheric pressure, the air leaks into the equipment, so there must be a shaft seal device to stop the leakage. There are many types of shaft seals, and because mechanical seals have the advantages of low leakage and long life, mechanical seals are the most dominant shaft sealing method in the world for these devices. Mechanical seal, also called end seal, is defined in the relevant national standards as "a device consisting of at least one pair of end faces perpendicular to the axis of rotation to prevent leakage of fluid by maintaining close and relative sliding under the action of fluid pressure and compensation mechanism elasticity (or magnetic force) and the cooperation of auxiliary seal."

 

3) Principles

Mechanical seal is a shaft sealing device that relies on a pair or several pairs of end faces perpendicular to the shaft for relative sliding under the action of fluid pressure and the elasticity (or magnetic force) of the compensation mechanism to maintain the fit together with the auxiliary seal and achieve leakage.

Commonly used mechanical seal structure by the stationary ring (static ring), rotary ring (dynamic ring), elastic element spring seat, set screw, rotary ring auxiliary seal and stationary ring auxiliary seal and other components, anti-rotation pin fixed in the gland to prevent the stationary ring rotation.

Rotating rings and stationary rings are often called compensating rings or non-compensating rings depending on whether they have axial compensation capability.

A mechanical seal is a shaft sealing device for rotating machinery. Examples include equipment such as centrifugal pumps, centrifugal machines, reactors and compressors. Since the drive shaft runs inside and outside the equipment so that there is a circumferential gap between the shaft and the equipment, the medium in the equipment leaks outward through this gap, and if the pressure inside the equipment is lower than atmospheric pressure, the air leaks into the equipment, so there must be a shaft seal device to stop the leakage. There are many types of shaft seals, and because mechanical seals have the advantages of low leakage and long life, mechanical seals are the most dominant shaft sealing method in the world for these devices. Mechanical seal, also called end seal, is defined in the relevant national standards as "a device consisting of at least one pair of end faces perpendicular to the axis of rotation to prevent fluid leakage under the action of fluid pressure and compensation mechanism elasticity (or magnetic force) and the cooperation of the auxiliary seal to maintain the fit and relative sliding.