How to solve the problem of Roots blower reverse damage
2021-01-09
Summary
There are many reasons for the damage of Roots blower caused by reverse rotation. What are the reasons and solutions for the friction between the impeller of the Roots blower and the casing, impeller and gear? Remember not to run in reverse. During the test run of the Roots blower, please check the rotation of the Roots blower and make sure that there is no problem with the steering before installing the test run.
There are many reasons for the damage of Roots blower caused by reverse rotation. What are the reasons and solutions for the friction between the impeller of the Roots blower and the casing, impeller and gear? Remember not to run in reverse. During the test run of the Roots blower, please check the rotation of the Roots blower and make sure that there is no problem with the steering before installing the test run.
Roots blower reversal is because the direction of rotation of the impeller is opposite to the direction of the rotating magnetic field of the motor nail, the starting current is larger, and the inertia of the impeller is much larger than when it is stationary. Therefore, the current and time for the fan to start exceed the current relay to ensure The working current and time set by the motor safely cannot start the reverse fan. To start the reversible roots blower, stop the reversible impeller first, for example, add a baffle at the inlet of the reversible blower, or use an external force to stop the impeller and then start it.
In the case of forward drive, sudden reverse rotation of the Roots blower is not allowed. Due to the pressure of the air outlet, the fan suddenly loses power or returns to the seat. Positive inertial rotation and outlet back pressure will cause the fan to reverse and damage the fan gears and couplings. In severe cases, the rotor or the entire fan may be damaged. In the past, the reversing rotor of the two-blade fan would be damaged immediately, and the gear of the three-blade Roots blower would also be damaged.
Normally, the Roots blower can be reversed, but it will start when the blower stops. If it runs in reverse for a long time, the fan needs to adjust the gap between the front and rear ends before leaving the factory. If the fan is suddenly powered off or returned to the seat due to the pressure of the air outlet, the forward inertial rotation and outlet back pressure will cause the fan to reverse and cause damage to the fan gear and coupling. In severe cases, the rotor or The entire fan may be damaged. Therefore, it is usually necessary to reverse it after it is disconnected from the original pipe, and it must be reversed after the fan has completely stopped running. When the fan is de-energized and tripped, the rotor and coupling are always damaged. Or install a check valve in front of the fan outlet or fan outlet to prevent the back pressure in the pipeline from affecting the fan itself.
The solution to the reverse rotation of the Roots blower is to install a check valve and ensure that the check valve can be safely closed. Usually, the three-blade Roots blower can be reversed, but it must be started when the fan stops. If it runs in reverse for a long time, the fan needs to adjust the gap between the front and rear ends before leaving the factory. For the fan blade reversal caused by a sudden power failure, the Roots blower trips after the power failure, and the 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.
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