use hydraulic oil seals and hydraulic oil for hydraulic drive system as the working medium

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use hydraulic oil seals and hydraulic oil for hydraulic drive system as the working medium, the transfer of energy conversion and control role, also plays the various components within the hydraulic system, lubrication, anti-corrosion, anti- rust and cooling. Seals in the hydraulic system plays to prevent fluid leakage from between the joint surface, keep up the pressure to maintain the energy transfer or conversion effects.

Domestic and international use of sealing materials is a polymer elastomer, under some special conditions for the use of plastic and all kinds of metal. But no matter which kind of material should have the following properties:

A certain mechanical and physical properties: tensile strength, elongation strength, elongation;hydraulic manifold block
2, there is a certain degree of flexibility, suitable hardness and compression set is small;
3, with the working media to adapt, not prone to swelling and decomposition of sclerosis;
4, wear-resistant, tear resistant properties;
5, with a high temperature, low temperature aging.

However, without any sealing material, including performance, according to the work envi ronment, such as temperature, pressure, media and sports to choose the appropriate sealing materials, and through the development of materials with the formula to meet certain requirements. Or two or more composite materials or a combination of structure in the form of play to their strengths to achieve more comprehensive results.

Sealing effect of the formation: dynamic seal is divided into non-contact seal and contact seals. Non-contact seals are mainly kinds of mechanical seals, such as: graphite packing ring, floating ring seal; rubber compound seals and rubber and plastic combination seals are contact seals rely on filling in the sealed cavity in the pre-pressing force. leakage channel blocking and sealing effect. Sealing of the hydraulic system with mostly static seal (seal), reciprocating seals (piston, piston rod seal) and the rotating seal.

Factors affecting the sealing effect of: sealing the structure of choice and film formation, pressure, temperature, material compatibility, dynamic seal in contact with the working surface of the material, hardness, geometry, surface finish.

A sealing material and hydraulic oil (fluid) compatibility:

One of the sources of particle contamination of hydraulic oil seal materials and hydraulic oil are incompatible \"debris\" or \"debris\". Seals due to \"swelling\" is damaged \"scrap\" or \"extraction\" out is not the combination of inorganic and filled with reinforcing material to seal damage and failure of the oil to the formation of pollution caused by hydraulic The deterioration of the oil resulting in failure.
Extensive use of the vane pump hydraulic system, the state of its working pressure greater than 6.9MPa, wear and tear issues become prominent, and thus anti-wear agent in hyd raulic oil; order to adapt to the high temperature heat and open flame near the hydraulic system, the use of phosphate ester fire resistant, water - glycol hydraulic fluid, oil in water and water in oil emulsion and so on. Students should \"use\" antioxidant, rust and other various types compound additives to configure the different uses of hydraulic oil (liquid) variety. Such as: non-zinc type anti-wear hydraulic oil compound type (gray type) anti-wear hydraulic oil compound with hydrocarbon sulphide, phosphate, phosphite, as well as at the same time sulfur, phosphorus and nitrogen The three elements of the SPN pressure and antiwear agent. Extreme pressure industrial gear oils, mainly to PS type extreme pressure agents.

The seals of the reasons for a \"swelling\" or \"extraction\" is the hydraulic oil additives contain various chemical elements and their concentration, based on \"like dissolves like\" principle, produce dif ferent effects on different sealing materials both sealing material medium resistance. For example: the Shell Omala 320 gear oil and Shell Omala 460 gear oil show the polarity of the elemental concentrations of phosphorus (P) is about 300ppm, nitrile rubber containing acrylonitrile groups, polar, and has excellent oil resistance, but not suitable for the type of oil in the medium conditions.

With the continuous research and development of varieties of hydraulic fluid (oil), to improve oil (liquid) and the performance of a variety of anti-wear, extreme pressure additives, metal deactivation agent, break the emulsifier, and anti-foam additives, seal material need experimental confirmation.

Second, the oil of the sealing material (liquid) performance testing assessment:


The rubber seal oil (liquid) performance, the general standard test oil, the test criteria specified temperature conditions and test time, soak, soak test values ??before a nd after contrast (such as the hardness of the material change, tensile strength, the rate of change, The rate of change of the elongation at break, the volume rate of change, compression, etc.), evaluation of its performance.

No1 Standard Oil \"low-volume increase in oil, the ingredients of this mixture of mineral oil by solvent extraction, chemical treatment, dewaxing of paraffin residues and neutral oil;

The No3 Standard Oil is a \"high-volume increase in oil, composed of two kinds of lubricating oil composition of selected ring alkyl crude products obtained after vacuum distillation.

Different uses of the material index value assessment.

3, hydraulic oil (liquid) on the performance of seals:

Seal theory: a dynamic flexible seal and its mating surface between the layer of lubricating film. In the normal state, it is with this layer of the lubricating film to seal the purposes and to extend the seal life.

In the hydraulic system, hydraulic oil (fluid) on the sealing performance of seal in addition to media / sealing material compatibility, oil viscosity, viscosity variation with temperature, reciprocating (rotation) velocity, pressure, and shaft, the cylinder or piston rod material, hardness, geometry, surface finish, and the seal structure of lubricant film formation and membrane characteristics of the factors that affect the sealing effect. In general, the formation of a continuous lubricating film to obtain the desired sealing effect.

NOK from Japan is the first in the world with the latest image processing technology to explain clearly the oil seal sealing principle. That the reason lubricating properties of the Seals (rotary dynamic seal), seal machine and sealing principle of two parts. The characteristics of lubrication: oil seal friction characteristics by fluid viscosity and sliding velocity dominated the movement of the oil seal and the shaft relative sliding surface under the lubrication condition of the oil film separation, so small friction, wear and tear. Seal principle: oil seal sliding contact surface of the oil flow from the side of the atmospheric side of the flow of oil side and from the oil side of the flow of atmospheric circulation. Good lubrication of the sliding surface prevents wear and tear, which did not leak.

When the system velocity is too high, the impact of continuous lubricant film formation, resulting in increased frictional heat, beyond the scope of the temperature of the sealing material to cause seal damage. Excessive pressure, in addition to the impact of oil film formation, but also on the rubber seals to produce the \"squeeze gap\" role \"circlip\" in general can be added to improve. Or select a small coefficient of friction, good self-lubrication seals PTFE combination will help to improve the lubrication between the friction pair, for high and low speed reciprocating motion and high pressure systems of the cylinder piston rod seal.


The key to the system working conditions and reasonable media environment use seals and sealing materials, the correct installation and maintenance of seals, effective sealing effect, reliability and service life. .