Effects of high temperature environment of hydraulic oil
High and low temperature environment on the impact of hydraulic oil hydraulic oil plays in the hydraulic system of energy transfer, wear, lubrication systems, corrosion, rust, cooling and so on. For the hydraulic oil, the first hydraulic device should meet at operating temperature and the temperature of the liquid viscosity at startup requirements, each of the hydraulic oil has a certain range, high or low temperature of the hydraulic oil are present unfavorable influence, then the high temperature environment in the end What are the implications of the hydraulic oil it?
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Effect of hypothermia on the hydraulic oil
(1) low-temperature hydraulic oil viscosity increases. Viscosity is too high, self-priming pump capacity decreases, the hydraulic system pressure loss increases, the power loss increases. It is generally believed that when the viscosity ≥1000mm2 / s, the hydraulic system is not working properly, viscosity ≥2000mm2 / s, the hydraulic system fails to start.
(2) low temperature hydraulic oil in the water solidification, solidification of water attached to the surface of the hydraulic valve parts, oil filters, etc., may lead to a hydraulic valve stuck, filter clogging, the hydraulic system is not working properly.
(3) low temperature of the hydraulic system in the rubber seal material shrinkage, hardening and reduce the sealing performance and even lead to seal failure.
(4) low-temperature hydraulic oil itself shrinking, especially in a closed cavity contraction of hydraulic oil, the pressure drop and even negative.
Effects of high temperature on hydraulic oil
(1) high-temperature hydraulic oil viscosity becomes smaller, the viscosity is too low, the hydraulic system leak increases, reduced efficiency and even the hydraulic system is not working properly.
(2) the role of high-temperature oxidation intensified hydraulic oil, hydraulic oil gradually generate some ketones, acids and resins, asphaltenes and other substances, contaminated hydraulic oil, shortening the life of the hydraulic oil. When the hydraulic oil oxidation to a certain extent, hydraulic oil fail, you can not use.
(3) high-temperature parts of the friction on the metal surface to form a lubricating film chemically decomposed, lubricating film destroyed.
(4) High-temperature often cause steel and other non-ferrous metal corrosion in the hydraulic oil intensifies, causing damage to parts of the surface, while producing corrosion.
(5) The temperature is more prone to air bubbles so that oil film breakdown, the friction surface occurs sintering or increased wear and accelerate the oxidative deterioration of hydraulic oil, affect the accuracy and sensitivity of hydraulic components, serious can not meet the requirements of the hydraulic system .
(6) The elevated temperature properties of rubber seals in the hydraulic system deteriorate, leads to the rubber to swell, soften, accelerate rubber aging, and even seal failure.
(7) The temperature of the hydraulic oil volume expansion, the closure in the cavity where the hydraulic oil pressure rise, resulting in danger.