How to choose the seal of the hydraulic pump? Dalan Hydraulics reminds you that the hydraulic pump seal has a certain degree of flexibility.
How to choose the seal of the hydraulic pump? Dalan Hydraulics reminds you that the hydraulic pump seal has a certain degree of flexibility.
The axial and radial movement of the spindle requires a certain degree of flexibility with the spring to ensure a seal between the contact faces.
The mechanical condition of the hydraulic pump and its length to diameter ratio play an important role in the reliability of the seal (PS: length to diameter ratio is a measure of the ratio of the diameter of the main shaft to its extension length, the lower the ratio, the better).
The flexibility of the seal is generally guaranteed by a large main spring and a series of small spring or corrugated seals.
The conventional seal design used in the past, the sealing pressure is applied to the rotating surface. This seal is called a rotary seal because the spring or corrugated seal rotates with the main shaft.
There is another relatively new design in which the spring or corrugated seal is mounted on a stationary surface.
In the current mechanical seals, the application of the above two sealing methods is very common, so that there is a certain flexibility for the installation.
Many of the mechanical seals of the early design used a single large spring to align around the main shaft, providing a strong sealing force to the sealing surface during hydraulic pump starting. The effect of the seal relies on the rotation of the spindle to tighten the spring coil.
The use of a plurality of smaller springs results in a more uniform load pressure on the sealing surface and therefore greater sensitivity to clogging.
The post-design seal uses a series of smaller springs arranged around the spindle to create a relatively uniform load pressure on the seal faces.
Since smaller springs can be pre-installed, most of these seals are completely isolated from the liquid of the hydraulic pump.
Metal bellows seals are generally used for highly corrosive liquids.
For many corrosive applications, the most versatile design is the use of metal bellows seals.
The bellows is welded from a series of metal discs to form a corrugated seal that prevents leakage.
This device can make the sealing pressure between the sealing surfaces more uniform, and it is not necessary to increase the secondary sealing on the sealing surface, so that naturally no corrosion wear occurs.
In general, although the main sealing pressure depends on the pressure of the packing box itself, the spring and the bellows can compensate for the insufficient pressure of the liquid pump during the starting and stopping process, so that the sealing surface always maintains a certain sealing pressure.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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