Dry screw pump and claw pump of principle

Comparing the screw pump and claw pump of vacuum unit, the gas in the pump is divided into the upper half cavity and the lower half cavity because the screw of the working device is a whole in two identical screw movements.

The principle of the dry screw pump is that the spindle is always pushed upward by the pressure of the lower chamber in the whole movement. Under the action of the screw, it is easy to produce resonance, which will easily lead to the short life of the pump. Therefore, the mechanical strength of the whole working device is highly required. The mechanical strength is high, and the requirements for machining and accuracy are all tested. On repair, but the spindle is damaged, the screw should be replaced in pairs, and the price is very expensive.

dry scroll vacuum pump

Dry Scroll Vacuum Pump

Claw pump is so called speculative, the working device (rotor) like two claws, relative direction of synchronous operation, resulting in volume changes to intake and exhaust, resulting in vacuum.

Generally, such working devices are divided into two groups: two pumps in series, and four pumps in series four. The two stage pump is widely used for transporting and transporting gas, vacuum feeding or as a later stage in the unit. It is characterized by high pumping speed and low vacuum, usually in the limit vacuum degree of 1000p&. Four-stage pumps are usually used in various environments with high vacuum limit. Generally, between 10p and 1p, because it is on the same axis, the vacuum chamber and pressure chamber are divided into four stages, each cavity can be converted to each other, so resonance will not occur, its life is longer, processing is not difficult, and maintenance is more convenient.

Imported claw pumps can be used for 4-5 years without maintenance. During maintenance, only oil seals and bearing lubricants must be replaced. Its shortcomings: first, it is difficult to manufacture large pumping speed pump, but Shanghai EVP Roots vacuum unit is easy to solve this problem; second, because the rotor is like a cake, so it is more sensitive to viscous material, easily cause overload and shutdown.

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