Phenomenon: if the hydraulic system of the gas-liquid booster pump (composed of the liquid booster pump and the box) penetrates into the air, and the bubble moves to the area in the liquid and flows with the high-pressure liquid, the bubble will break under the effect of high pressure and cause the local hydraulic impact, resulting in noise and vibration. In addition, because the bubble destroys the continuity of fluid flow, reduces the oil flow of the pipeline, causes the fluctuation of flow and pressure, makes the hydraulic components bear the impact load, and affects their service life.
Cause: hydraulic oil always contains a certain amount of water, which is usually dissolved in oil or mixed in the form of bubbles. When the pressure is lower than the air separation pressure, the dissolved air in the oil separates and forms bubbles. When the pressure drops below the saturated vapor pressure of the oil, the oil boils and creates bubbles. These bubbles mix with oil to form a discontinuous state, which is called cavitation.
Location: if the suction port and suction pipe are lower than normal pressure, cavitation is easy to occur; when the oil flows through the narrow gap such as throttle hole, cavitation will also occur due to the increase of speed and the decrease of pressure.
Damage: high pressure area and movement of foam oil rapidly break down under high pressure, resulting in sudden reduction of volume around and high speed flow of high pressure oil to replenish, resulting in local instantaneous effects, pressure and temperature rise sharply, strong noise and vibration.
Measures: correctly design the structural parameters of the hydraulic pump and the suction pipeline of the pump, try to avoid the narrow and sharp bend in the oil circuit, prevent the low-pressure area; reasonably select the mechanical materials, improve the mechanical strength, improve the surface quality, and improve the corrosion resistance.
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