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What are the causes of leakage of hydraulic seals
Nov 15,2023
There are many reasons for leakage of hydraulic seals. The structural form of seals, the material of seals, the design and manufacturing quality of sealing slots, the design and manufacturing quality of sealing surfaces, the installation quality of seals, the working environment of seals and the dirt of hydraulic cylinders will cause leakage of commonly used hydraulic seals. Improper selection of seal structure. Easy to leak. Usually, the structural form of hydraulic seals has a very complex effect on leakage.
Under the same working conditions, the leakage of the lip seal is usually less than that of the self-sealing compression seal, and the lip seal is usually the least leakage of the Yx seal. Improper selection of seal material is easy to cause leakage. If the sealing material is too soft, then the hydraulic cylinder is working, the seal is easy to squeeze into the seal gap and damage, resulting in the leakage of hydraulic oil. If the sealing material is too hard. Even under the action of greater external force, the deformation of the seal is more difficult, and obviously the initial contact stress and additional contact stress generated by it on the sealing surface are bound to be low, which aggravates the leakage of hydraulic oil.
If the sealing material is incompatible with the hydraulic oil, then the seal will swell, soften, dissolve or embrittlement hard, etc., no longer has elasticity and loss of sealing effect, resulting in leakage of hydraulic oil. If the section size of the sealing groove is too large, the compression deformation generated after the installation of the seal is too small. The initial contact stress generated by the seal on the sealing surface is low, which is easy to cause leakage. On the contrary, if the cross-section size of the sealing groove is too small, although the compression deformation generated by the seal is too large, the friction resistance is large, the temperature rise is high, and the seal is easy to cause premature wear and leakage.
The sealing parts are installed in the sealing groove with low dimensional accuracy, rough surface and low shape position accuracy, which is easy to damage the sealing parts and cause leakage. If the seal gap is too large, then under the action of pressure liquid, the seal is easy to squeeze into the seal gap, and it is easy to damage the seal and cause leakage under the action of frequent work of the hydraulic cylinder. If the seal gap is too small, then the surface of the two relative moving parts is not enough to form the minimum lubricating oil film required for relative movement, resulting in them being in a semi-dry friction or dry friction state, accelerating the premature wear of the seal and causing leakage. For example, when the dimensional accuracy is low, the surface is rough and the shape position accuracy is low, the sealing surface is in frequent contact with the seal. It is easy to damage the seal and cause leakage.
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