In the process of using the gear pump, as the vacuum pump oil directly into the pump chamber, when the vacuum pump is running, with the gas pressure gradually decreased, the pump temperature gradually increased. The saturated vapor pressure of oil molecules in the molecular components can be evaporated to the vacuum space, which affects the vacuum pump to achieve the ultimate pressure, but also back to the vacuum diffusion system, the vacuum system, and directly affect the ultimate vacuum. Vacuum gear pump is a positive displacement pump working principle, work rely on the main, driven gear intermeshing caused by changes in work volume to transport the melt. Working volume by the pump body, gear tooth groove and the bearing with a side plate function. When the gear rotates, the melt enters the tooth spaces of the two gears of the suction chamber. As the melt is rotated, the melt is brought into the discharge chamber from both sides, the gears mesh again, and the melt in the tooth spaces is pushed out of the discharge chamber, Pressure to the export pipeline. Bearings can not use the usual grease to avoid contamination of the melt, usually using melt self-lubricating. So that the working chamber of the pump is continuously increased or decreased. When the volume of the working chamber becomes the minimum, it communicates with the inlet pipe of the vacuum pump, so the gas enters into the gradually enlarged working chamber. When the volume of the working chamber expands, Separated from the inlet pipe, the volume valve is opened and the compressed gas is discharged through the reservoir. Pump chamber volume continues to expand and compress, complete the process of aspiration and exhaust, so that the gradual discharge of the gas container to achieve the required degree of vacuum. When the vacuum pump is running, with the rotation of the rotor in the pump chamber, the slide plate in the two longitudinal grooves on the rotor or the slide valve ring on the eccentric wheel slides against the inner wall of the stator, and the rotor, the slide plate and the inner wall of the stator inevitably depend on oil Product lubricity to avoid scratching the friction material, the use of oil to isolate the atmosphere, and take away the heat generated by friction. Therefore, the vacuum pump oil in the pump body responsible for lubrication, sealing, and cooling effect.
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