The working feature of Roots blower is that there is always a small gap between the end face of the impeller and the front and rear end covers of the blower as well as between the impeller of the blower. Driven by the synchronous gear, the air is transported from the air inlet of the blower to the exhaust side along the inner wall of the casing, causing intermittent and periodic changes in the suction and exhaust, and the gas in the pipe is pulsating. Gas parameters in the pipe, such as pressure, velocity and density, constantly change with the position and periodically change with time. This phenomenon is called gas pulsation. When pulsating gas encounters elbow, reducer, control valve and other components, it will generate exciting force varying with time. Under the action of this exciting force, the pipeline will vibrate. The vibration source of pipeline vibration is mainly the pressure pulsation of the gas in the pipeline. Since the pressure pulsation always exists, it is normal for Roots blower to vibrate to some extent within the allowable range, but severe vibration should be avoided, otherwise the pipeline may be damaged.
1. Unqualified original design
At the beginning of the design, Roots blower will be designed according to the environment, temperature, flow, etc. After the design of Roots blower is completed, it will be assembled and installed, and then various tests will be carried out. Only qualified products will be shipped. If there are problems at the beginning of the design, coupled with loose management, the Roots blower is prone to abnormal vibration after leaving the factory.
2. Parts processing is unreasonable
If there are negligence reasons in the processing of Roots blower parts, the defective rate of Roots blower will also be increased. If there is deviation in the manufacturing of Roots blower parts, the operation of the blower will be unreasonable, and it is easy to cause abnormal vibration or noise of the blower.
3. Unreasonable installation
Improper installation of roots blower may also cause abnormal vibration of the blower, such as excessive humidity, uneven ground, misplaced parts, improper rotor placement, etc., which may aggravate the loss of high-temperature roots blower.
4. Unreasonable operation of Roots blower
During the operation of Roots blower, we must do a good job in the maintenance of the equipment, and timely check the temperature, pressure, motor power, lubricating oil, coolant, motor speed, etc. to ensure the normal operation of Roots blower. When starting and stopping Roots blower, the corresponding process shall be followed. If the long-term operation is unreasonable, the impeller and bearing of Roots blower may be damaged.
Suggested elimination measures for vibration:
Piping vibration will cause fatigue damage of piping and pipe support, building induced vibration, noise, etc. Large vibration will also cause damage to insulation materials, wrong instrument indication, fatigue failure of piping and equipment, etc. The recommended methods for the problem of Roots blower piping vibration are:
(1) First, contact the Roots blower manufacturer to eliminate the possible vibration factors of the blower one by one, so as to ensure that no severe vibration will occur due to the problems of the equipment itself.
(2) Take measures to avoid structural (mechanical) resonance of pipeline to conduct dynamic analysis of pipeline system and avoid resonance. Increase the rigidity of the pipeline to adjust the natural frequency of the pipeline system to avoid the frequency of machine vibration.
(3) The support type is modified to increase the effective suppression of pipeline vibration, instead of only adopting the load bearing design, the anti vibration pipe clamp must also be used to ensure full contact between the pipeline and the pipe clamp.
(4) The flexible vibration damping connection measures between the pipeline and the heat exchanger shall be added to avoid the fatigue damage of the metal materials of the equipment caused by the transmission of the vibration of the pipeline to the heat exchange equipment.
Text label: Roots blower
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