Download Fundamentals of Vacuum Technology by W. Umrath PDF

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By W. Umrath

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Degassing of the pump oil In oil diffusion pumps it is necessary for the pump fluid to be degassed before it is returned to the boiler. On heating of the pump oil, decomposition products can arise in the pump. Contamination from the vessel can get into the pump or be contained in the pump in the first place. These constituents of the pump fluid can significantly worsen the ultimate pressure attainable by a diffusion pump, if they are not kept away from the vessel. Therefore, the pump fluid must be freed of these impurities and from absorbed gases.

The pressure increases until the discharge slot is opened. If at that point the exhaust back pressure has not been reached, the compression space is suddenly vented with hot exhaust gas. As the volume is reduced further, the gas at exhaust pressure is ejected. The work done on compression is represented by the area under the p-v curve 1-2-3-4. It is almost completely converted into heat. In the case of dry compressing vacuum pumps not much of this heat can be lost to the cooled casing due to the low density of the gas.

The design principle of a claw pump is explained by first using an example of a four-stage design. The cross section inside the pumpÕs casing has the shape of two partly overlapping cylinders (Fig. 23). Within these cylinders there are two freely rotating rotors in each pump stage: (1) with their claws and the matching recesses rotating in opposing directions about their vertical axes. The rotors are synchronized by a gear just like a Roots pump. 01 mm. The rotors periodically open and close the intake and discharge slots (5) and (4).

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