What are the advantages of variable pitch screws in screw pumps?
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The screw pumps we usually see are all constant-pitch screws. I wonder what advantages a variable-pitch screw has over a constant-pitch screw? I couldn’t find it on Baidu.
The main feature of the variable pitch dry screw vacuum pump is that the screw pitch changes according to the variable pitch coefficient from the suction end to the exhaust end, and the large lead end corresponds to the suction port. At the beginning, the suction volume is large. During the rotation of the rotor, the moving closed cavity becomes smaller and smaller. The gas is compressed and has an internal compression effect, that is, it is compressed while being transported, which can reduce the overall exhaust compression power consumption and inhibit the surge phenomenon that occurs at the exhaust port. The pump works more smoothly and can reduce noise and exhaust vibration.
Thank you for your answer. The newcomers are in short supply of Haichuan coins, so I won’t give them to them.
The most obvious advantage of variable pitch over constant pitch is energy saving and noise reduction. Generally speaking, variable pitch can save energy by 16-30%. The temperature of the exhaust port is also lower than that of equal pitch. However, limited to the higher profile design and processing accuracy requirements of variable pitch, only some domestic manufacturers have the ability to truly produce variable pitch screw vacuum pumps.
At present, equal screws and variable-pitch screws are very common. Variable-pitch screws can be designed according to the process environment. Conventional ones include equal changes, sudden changes, gradual changes, etc., as well as gradually tapered screws, etc.