Dalan Hydraulics tells you the principle of mechanical seals for hydraulic pumps

To understand the cause of mechanical seal leakage of hydraulic pumps for hydraulic pumps, it is first necessary to clearly understand the principles and requirements of mechanical seals. Let's take a look at the steps of Dalan Hydraulics.

Mechanical seal refers to a sealing device in which two sealing elements are attached to each other on a smooth and straight surface perpendicular to the axis, and are relatively rotated. He is usually composed of a static ring, a moving ring, and a spring loading device (including Push ring, spring box) auxiliary seal ring (moving ring seal ring, static ring seal ring) and other components, the anti-rotation pin inside the anti-rotation sleeve is fixed on the outer pressure cover to prevent the static ring from rotating.

The end faces of the moving ring and the stationary ring constitute a pair of friction pairs, and the moving ring is pressed against the end surface of the stationary ring by the pressure of the liquid in the sealing chamber, and the appropriate specific pressure is generated on the end faces of the two rings and the layer is kept extremely thin. The liquid film is sealed, so from the structural point of view, the mechanical seal is mainly to change its extremely leaky axial seal to a leak-proof end face seal. The mechanical seal is not a separate component in the actual operation process. It works in combination with other components.

It can be seen from the basic principle that the normal operation of the mechanical seal must meet the following conditions:

1. The volume of the hydraulic pump shaft should not be too large;

2, the hydraulic pump shaft deflection at the mechanical seal is small, only to meet such external factors, coupled with good mechanical seal performance, can achieve the desired sealing effect.

Although we are analyzing the causes of mechanical seal leaks in hydraulic pumps, it is customary to look for the cause of the mechanical seal itself.

Eg: 1 is suitable for selection;

2 whether the material selection is correct;

3 Whether the specific pressure of the sealing surface is correct;

4 Whether the choice of friction pair is reasonable;

5 Whether the end cap is perpendicular to the shaft and so on.

However, it is rare to find the cause of the external conditions of the mechanical seal. In fact, the external cause of the mechanical seal is also important.

Eg: 1 hydraulic pump to create the conditions for mechanical seals,

2 Whether the configuration of the auxiliary hydraulic system is appropriate.







----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant

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