Roots blower can be reversed, but it can be started when the blower stops. In case of long-term reverse operation, the fan shall be adjusted for the front and rear end clearance before leaving the factory. Sudden power failure of the fan or reverse rotation of the fan caused by pressure return of the air outlet, forward inertial rotation and outlet back pressure may break the fan gear and coupling, or even the rotor or the whole fan may be damaged in serious cases. Therefore, it is generally required to disconnect from the original pipe before reversing, and the reversing can only be performed after the fan is completely stopped. When the fan is powered off and trips, the rotor and coupling are always broken. A check valve is installed in front of the fan outlet or at the fan outlet to prevent the impact of back pressure in the pipeline on the fan itself.
The solution to the reverse rotation of Roots blower is to install a check valve and ensure that the check valve can be closed safely. In this case, Roots blower can be reversed, but it must be started when the blower stops. In case of long-term reverse operation, the fan shall be adjusted for the front and rear end clearance before leaving the factory. For the fan blade reversal caused by sudden power failure, the Roots blower tripped after power failure, and the rotor and coupling were 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 fan itself.
The general roots blower has water cooling and air cooling. Air cooling can be used according to the technical requirements. If the temperature is high, water cooling is required. In order to ensure the normal use of the main and auxiliary oil tanks, cooling treatment is also required to reduce the temperature of the lubricating oil. The temperature of general lubricating oil shall not exceed 65 ℃.
In winter, it should also be noted that when the water-cooled Roots blower is not used for a long time in winter, the water in the cooling pipe should be drained to avoid freezing and cracking of the cooling pipe.
During the design of Roots blower, the clearance between impellers will also affect the heat dissipation, such as the casing clearance, impeller clearance, wallboard clearance, etc. These are also the key points in the design. Some small manufacturers have short service life because of poor design.
The design of impeller clearance shall meet certain standards, and it shall also be checked during use. During the annual overhaul, the dust and dirt on the impeller shall be treated to ensure that the impeller clearance is within the standard error, and the clearance is not too small.
The lubricating oil is very easy to be damaged by the high temperature of Roots blower, so the cooling treatment of the lubricating oil needs to be protected in many ways. In addition to the application of water cooling, we also need to carry out other treatment. From the inside of the casing to the wallboard and then to the lubricating oil, the temperature should be reduced in order for cooling treatment.
I believe that after reading the above content, you should also have some understanding of how to solve the problem of Roots blower reversal, and I hope it will help you.
Text label: Roots blower
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