Roots blower, also known as Roots blower, is a type of volumetric rotary blower. The following is a detailed introduction to Roots blower:
1、 Working principle
The working principle of Roots blower is to compress and transport gas through relative motion of two blade rotors in the cylinder. The synchronous gear at the rotor shaft end ensures that the two rotors remain in mesh, while the concave surface on the rotor and the inner wall of the cylinder together form the working volume. During the rotation of the rotor, when the gas brought in from the suction port moves to the vicinity of the exhaust port, the pressure in the working volume suddenly increases due to the reflux of high-pressure gas, and then the gas is transported to the exhaust channel. The two rotors are not in contact with each other and sealed through tightly controlled gaps to ensure that the discharged gas is not contaminated by lubricating oil.
2、 Main features
1. Simple structure: Roots blower has a compact structure, is easy to manufacture, and is easy to maintain and repair.
2. Wide pressure selection range: Roots blowers have the characteristic of forced gas transmission. When the pressure is adjusted within the allowable range, the flow rate changes very little, so the pressure selection range is very wide.
3. Pure conveying medium: Due to the two rotors not contacting each other and being sealed through gaps, the discharged gas is not contaminated by lubricating oil, making it suitable for conveying clean air, clean coal gas, sulfur dioxide, and other inert gases and special gases.
4. Low vibration and noise: Roots blower operates smoothly, with minimal vibration and relatively low noise. Especially for the three bladed rotor, compared to the two bladed rotor, the gas pulsation is smaller, and the vibration and noise are lower.
5. Strong adaptability: Roots blowers are widely used in multiple industries such as metallurgy, chemical engineering, fertilizers, petrochemicals, instruments, and building materials.
3、 Performance parameters
The performance parameters of Roots blower mainly include flow rate, pressure, speed, power, etc. The specific parameter range is as follows:
1. Flow rate: 0.15~1200 cubic meters per minute
2. Pressure: 9.8~196 kPa
3. Speed: 150~3000 revolutions per minute
4. Power: 0.75~1000 kW
4、 Usage and maintenance
Usage requirements:
1. The temperature of the intake medium transported shall not exceed 40 ℃.
2. The particle impurity content in the medium should not exceed 1000mg/m3, and the particle size should be below 0.1mm.
3. When using boost, the rated boost value specified on the blower nameplate must not be exceeded.
Preparation before startup:
1. Open the intake control valve, exhaust control valve, and bypass pipe.
2. Check if the air filter at the inlet is unobstructed and if the inlet of the filter is open.
3. Check whether the pipes, valves, mufflers, and air filter supports are stable.
4. Check whether the lubricating oil is in good condition, whether the model is suitable, and whether the depth of the lubricating oil layer should reach 3-5 centimeters above the specified oil line; Check if the cooling water system is unobstructed.
5. Move the coupling and check if the impeller runs smoothly and if there is any friction or collision.
6. Check if the connections of each part are good and if there is any looseness.
7. Surrounding debris, keep there no debris within two meters of the fan.
8. Check if the electrical components and voltage reducing starting equipment are intact.
9. Check whether the maintenance tools are complete and whether the fire-fighting equipment is sufficient.
Start and Run:
1. When starting the Roots blower, it should be run empty for 20-30 minutes first, and observe whether there are any abnormal phenomena in the blower. If there is any impact or friction sound, it should be stopped immediately for inspection and troubleshooting.
2. After the empty machine runs normally, the load can be turned on.
3. After the fan is running normally, gradually adjust the outlet valve (or gradually close the vent valve) and gradually load it to the rated pressure, but do not overload it.
4. It is strictly prohibited to close the inlet and outlet gate valves when starting up, nor to suddenly stop when fully loaded.
Shutdown operation:
1. When shutting down, the bypass pipe should be opened first for "air release", and the power should be cut off when the air pressure drops to near zero.
2. Close the intake valve and cooling water system in sequence.
Maintenance and upkeep:
1. Regularly check the oil level in the fuel tank and replenish the oil promptly if it is found to be below the oil level line; When oil leakage is detected, replace the sealing components or paper pads in a timely manner and tighten the sealing glue.
2. Regularly replace engine oil and grease to keep the lubrication system clean.
3. Regularly check the status of inlet and outlet valves and bypass pipes to ensure they are in good working condition.
4. Regularly check the rotor gap and sealing device, and adjust or replace them promptly if the gap is too large or the sealing is poor.
5. Keep the fan room clean and well ventilated, and avoid inhaling too much dust to block the intake muffler or fan gap.
5、 Application Fields
Roots blowers have been widely used in various fields due to their unique performance characteristics
1. Wastewater treatment: An aeration system used for wastewater treatment to provide oxygen to promote microbial growth and decomposition of organic matter.
2. Aquaculture: An oxygenation system used in aquaculture to increase the oxygen content in water and promote the growth of aquatic organisms.
3. Pneumatic conveying: Used for conveying systems of powdered and granular materials, such as cement, coal powder, etc.
4. Chemical production: Used for gas transportation, pressurization, and vacuum extraction processes in chemical production.
5. Foundry industry: A sand processing system used in the foundry industry, providing compressed air to blow and mix sand materials.
In summary, Roots blowers have been widely used and recognized in multiple fields due to their simple structure, wide pressure selection range, pure conveying medium, low vibration and noise, and strong adaptability.
