Roots blower is a rotary displacement fan, which rotates at a constant speed in the opposite direction through two waist shaped rotors, and basically insulates the suction chamber and exhaust chamber depending on the clearance between the impeller and the impeller, and between the impeller and the housing. With the help of the rotation of the impeller, the gas in the volume is pushed to complete the suction, compression and exhaust processes. When the upper rotor rotates clockwise, the lower rotor rotates counterclockwise, and the gas is sucked from the left side. As the working volume decreases during rotation, the gas is compressed, and finally discharged from the right outlet to achieve the purpose of blowing.
The roots blower adopts three leaf involute linear type, the shaft end seal adopts mechanical seal, the mechanical seal lubrication method is forced circulation of the oil station, and the oil seal adopts non-contact seal plus V-ring seal. The upper side intake and the lower side exhaust are adopted.
The air output of the blower is proportional to the number of revolutions. When the outlet resistance changes, the air output will not be significantly affected. Roots blower has simple structure and high efficiency, and its working rotor needs no lubrication. It is widely used to transport toxic, harmful, flammable, explosive and corrosive gases.
Generally, the three leaf involute linear type is adopted. The shaft end seal adopts mechanical seal. The mechanical seal lubrication mode is forced circulation of the oil station. The oil seal adopts non-contact seal plus V-ring seal. The upper side intake and the lower side exhaust are adopted. After being put into use, the static ring of the mechanical seal continuously cracks and breaks in a small area, the static ring can no longer expand and contract freely in the static ring cavity, the contact between the fan shaft and the O-ring of the mechanical seal dynamic ring is severely worn, and the mechanical seal has internal or external leakage, which affects the safe and stable operation of the device.
As the mechanical seal of Roots blower is complex in structure and inconvenient in disassembly and assembly, the assembly of mechanical seal is very important. Whether the mechanical seal is well assembled is also an important factor affecting the use of seal. Let's take a look:
1. The spring pressure is too large. The compressor is subject to power rise, overheating, smoke, noise, abnormal leakage, a large amount of wear products and abnormal vibration, resulting in slipping, cracking, early wear, sintering, scratching or damage of rotating mechanism and transmission mechanism.
2. The spring pressure is too small. Leakage occurs, resulting in the failure of moving ring without change.
3. The rotating part contacts the stationary part. Make the compressor overheat, leak and sound, resulting in seal damage.
4. Assembly tilt. Leakage occurs, causing wear of seal ring, shaft and transmission part.
5. The screw is improperly screwed. Leakage occurs, leading to wear of seal ring and shaft.
I believe that after reading the above, you should also understand the main reasons for the seal leakage of Roots blower. I hope it will be helpful to you.
Text term label: Roots blower
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