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How to solve the reverse rotation damage problem of Roots blower? The manufacturer explains:

Source: Roots blower manufacturer Published on: November 10, 2021 Hits:

How to solve the reverse rotation damage problem of Roots blower:

Under the condition of normal forward drive, sudden reversal of roots blower is not allowed. Due to the pressure at the air outlet or the sudden power failure of roots blower, the positive inertia rotation and outlet back pressure will cause the roots blower to reverse and damage the gear and coupling of roots blower. In serious cases, the rotor or the whole fan may be damaged. In the past, when the two blade fan reverses, the rotor will be damaged immediately. In the same way, the gear of the three blade roots blower will also be damaged.

Normally, roots blower can be reversed, but it will start when the blower stops. In case of long-term reverse operation, the manufacturer of Roots blower is required to adjust the gap between the front end and the rear end. If the power of the fan is suddenly cut off due to the pressure at the air outlet, the forward inertial rotation and the outlet back pressure will cause the fan to reverse and damage the fan gear and coupling. In serious cases, the rotor or the entire fan may be damaged. Therefore, it is usually necessary to reverse the original pipe after it is disconnected, and it must be reversed after the fan is completely stopped. When the fan is powered off and tripped, the rotor and coupling are always damaged. It is better to install a check valve in front of the fan outlet or at the fan outlet to prevent the back pressure in the pipeline from affecting the fan itself.

How to solve the reverse rotation damage problem of Roots blower?

So how to solve this problem? The answer is: install the check valve.

The solution to reverse rotation of Roots blower is to install a check valve and ensure that the check valve can be closed safely. Generally, the three blade roots blower can be reversed, but it must be started when the fan stops. If the fan runs in the opposite direction for a long time, it is necessary to adjust the gap between the front end and the rear end before leaving the factory. For fan blade reversal caused by sudden power failure, roots blower trips after power failure, and rotor and coupling are always damaged. The solution is to install a check valve in front of the fan outlet or at the fan outlet to prevent the back pressure in the pipeline from affecting the roots blower itself.

Conclusion: From the above, we know that Roots blower can only run in the direction for a long time when the power is cut off and the pipe interface is broken, otherwise the impeller will be damaged, causing failure.
The above is the problem and solution of roots blower reversing damage. Please read it carefully. If you have any questions, please contact the technicians of roots blower manufacturer to solve them.

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