Roots blower is a type of positive displacement blower, which can be classified from multiple dimensions. The following is the specific classification method and corresponding explanation:
1、 Classified by impeller shape
1. Two blade Roots blower: a Roots blower with two impellers.
2. Three blade Roots blower: a Roots blower with three impellers. The three bladed impeller undergoes three suction and exhaust cycles with two impellers per rotation. Compared to the two bladed impeller, the three bladed impeller has less gas pulsation, smaller load changes, higher mechanical strength, lower noise, and less vibration.
2、 Classified by purpose
1. Kiln blower: used for ventilation and blowing in kilns.
2. Oxygenation blower: used to increase the oxygen content in water, commonly used in aquaculture and other fields.
3. Wind knife blower: used to generate high-speed airflow for cleaning, drying, and other purposes.
4. Aeration blower: mainly used for the aeration process in sewage treatment.
5. Conveyor blower: used for conveying gases or powders.
3、 Classified by conveying medium
1. Air blower: used for conveying air.
2. Gas blower: used for transporting gas.
3. Steam blower: used for conveying steam.
4. Other gas blowers: used to transport gases other than air, gas, and steam.
4、 Classified by import and export direction
1. Positive pressure blower: a fan with an outlet pressure higher than the inlet pressure.
2. Negative pressure blower: also known as Roots vacuum pump, a fan with an inlet pressure lower than the outlet pressure.
5、 Classified by cooling method
1. Air cooled blower: a fan that cools through air.
2. Water cooled blower: a fan that cools through water.
6、 Classified by structural type
1. Ordinary blower: a Roots blower with a conventional structure.
2. Dense blower: A compact Roots blower with multiple fan units arranged densely.
7、 Classified by sealing form
1. Maze seal: a method of sealing using labyrinth grooves and sealing teeth.
2. Elastic sealing: a method of sealing using elastic materials.
3. Packing sealing: a method of preventing medium leakage by filling sealing materials.
4. Mechanical seal: a method of sealing using mechanical devices.
8、 Classified by working methods
1. Single stage blower: a compression stage blower.
2. Double stage series blower: A blower that connects two single-stage blowers in series to compress gas twice in a row.
9、 Classify by other methods
1. Roots blower: a type of screw centrifugal fan consisting of two interlocked impellers, which has the advantages of low noise, low vibration, and small size. It is widely used in mining, chemical, papermaking and other fields.
2. Side Roots blower: with a special structure consisting of a rotating main impeller and a stationary sub impeller, it has the advantages of low noise, small size, and high efficiency, and is widely used in water treatment, metallurgy, building materials, and other fields.
3. Horizontal Roots blower: consists of two gradually opening waist shaped rotors (hollow or solid), an elongated casing, and two parallel shafts.
4. Vertical Roots blower: Compared to horizontal Roots blower, it has a different structural arrangement.
In summary, Roots blowers come in various types, and users can choose the appropriate type based on their specific usage scenarios and needs.
