The utility model discloses a mechanical seal screw vacuum pump with an external cooling device, which comprises two screw rotors and an input shaft driving the two screw rotors to rotate. The two ends of the screw rotor are provided with a mechanical seal, the extension of the input shaft and the atmospheric side are provided with a mechanical seal; the mechanical seal part is provided with a cooling cavity; the screw vacuum pump is provided with a device for taking away the heat of the mechanical seal The external cooling circulating device is a circulating circuit composed of oil tank, oil pump and oil separator.
Compared with the prior art, the vacuum pump of the utility model adopts mechanical seal and forced circulation cooling, which completely blocks the leakage between the front of the pump and the cooling chamber as well as between the cooling chamber and the atmosphere; the external circulation cooling device forces the mechanical seal to cool down, with low working temperature and sufficient lubrication, which increases the service life and reliability of the overall transmission parts, and has the advantages of low energy consumption, good cooling effect and safe operation It is fully reliable.
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