The volume percentage of air contained in the hydraulic medium is called the air content. The air in the hydraulic medium is mixed with air and dissolved air. Generally, 8%-10% air is dissolved in oil. The dissolved air is uniformly dissolved in the Hydraulic Press medium, and has no effect on the bulk elastic modulus and viscosity, while the mixed air is suspended in the hydraulic medium in the form of bubbles with a diameter of 0.25-0.5mm, which has obvious effects on the bulk elastic modulus and viscosity Influence. In addition, if the air content is too large, there is a danger of steam cassette and “diesel effect”. The above phenomenon will cause the material to rot.
Under the atmospheric pressure of a hydraulic machine, air dissolves in the hydraulic fluid. And under low pressure. For example, when the air separation pressure of the working fluid is lower, the air will be released. Generally, the air separation pressure of the hydraulic medium is 1300-6700Pa. In addition, when the pressure of the working fluid is lower than a certain value, the hydraulic medium will boil and produce a large amount of steam. This pressure is called the saturated vapor pressure of the medium at this temperature. Mineral oil hydraulic oil has a saturated vapor pressure of 6-2000Pa at 20°C. The saturated vapor pressure of an emulsion is similar to that of water. The hydraulic oil of a hydraulic press is 2400Pa at 20°C.
The above content is what to do if the hydraulic oil is mixed into the air, I hope it can be helpful to everyone. If you want to know more about hydraulic press, please call Dongguan China Machinery Co., Ltd. We will serve you wholeheartedly.