Dalan Hydraulics tells you that the key to preventing leakage of the hydraulic pump is to choose a mechanical seal.
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Mechanical seals use the principle of two planes rubbing against each other to achieve the purpose of sealing.
The rotating sealing surface is mounted on the main shaft of the liquid pump, and the fixed sealing surface is mounted in the sealing gland.
Since one sealing surface is moving and the other sealing surface is stationary, such a seal is referred to as a dynamic seal.
The seal between the rotating surface and the stationary surface is the most critical factor in determining sealing performance.
The basic mechanical seal has 4 leak paths that need to be sealed:
1. The passage between the sealing faces;
2. The path between the rotating surface and the main shaft;
3. The passage between the fixed surface and the gland;
4. The passage between the gland and the packing box.
The latter two leak paths generally use a static seal because there is no relative motion between the two parts.
This part of the seal is often referred to as a three-time seal, and the seal material is a gasket or an O-ring that is compatible with the process liquid.
In older seal designs, the secondary seal under the rotating surface leaves a certain gap that can move back and forth on the spindle, thus prone to wear and premature failure.
However, in newer seal designs, the secondary seal is at rest, thus avoiding wear and corrosion problems on the spindle.
In the normal operation of the hydraulic pump, the pressure between the rotating surface and the stationary surface is kept in a sealed state due to the pressure generated by the liquid in the packing box, and the pressure of the packing box is maintained by the pressure generated by the spring during starting and stopping ( It can even be replaced by the pressure of the spring).
Most mechanical seals are designed with a softer material to create a rotating surface that causes rotational friction on a harder, stationary surface. For many years, the most versatile combination has been to use carbon material as a rotating surface to run on a ceramic stationary surface. This type of material is still in common use today, but the static surface is made of stainless steel "target=_blank> stainless steel or a harder material, such as tungsten carbide or silicon carbide.
Regardless of the material used, a liquid film must be maintained between the contact surfaces to provide lubrication. However, in the stuffing box, a combination of spring load and liquid pressure can provide a good sealing effect between the sealing faces. However, if the sealing pressure is too high, it will affect the formation of a liquid film between the contact faces, resulting in increased heat and premature wear. If the sealing pressure is too low, the gap between the contact faces increases, which is liable to cause liquid leakage.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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