For water ring-Rotary vane vacuum pump systems, why is the rotation direction of the Rotary vane pump opposite to that of the water ring pump?
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Generally, the motors of centrifugal pumps and water ring pumps rotate counterclockwise. Then why do the rotary vane pumps in the second and third stages of vacuum pump units rotate in the opposite direction to that of the water ring pump in the first stage?
The motor rotation direction of rotary vane pumps varies depending on the design of different manufacturers. First, you need to understand the working principle of the rotary vane pump; if different shafts are used as the drive shafts, one shaft will cause clockwise rotation while the other will cause counterclockwise rotation
Yes, the primary water ring rotates in the clockwise direction, while the secondary and tertiary Roots pumps rotate counterclockwise
The rotation directions of the two rotors in a Roots pump are opposite to each other; that’s the one you’re referring to
There’s no reason for this. When looking at a Roots vacuum pump from the motor side, if the drive shaft is connected to the rotor on the right side, rotation is clockwise; if it’s connected to the rotor on the left side, rotation is counterclockwise. In the case of water ring vacuum pumps, it depends on the rotation direction of the motor and the bending direction of the blades – the rotation direction is opposite to that of the blade bending... 99% of the vacuum pump manufacturing industry in China lacks the capability for design, so they simply copy existing designs; changing the direction of rotation requires numerous design adjustments... Besides, this doesn’t really matter much – having the rotation directions aligned doesn’t carry much significance……