Roots blowers and Roots vacuum pumps are two common types of mechanical equipment that play important roles in industry and scientific research. The following is a detailed comparison and introduction of these two devices:
1、 Roots blower
1. Definition and purpose:
Roots blower, also known as Roots blower, is a type of volumetric rotary blower.
Mainly used for air transportation, widely applied in fields such as sewage treatment, pneumatic conveying, gas pressurization, etc.
2. Working principle:
By using two blade shaped rotors to perform relative motion within the cylinder, gas compression and transportation are achieved.
The synchronous gear at the rotor shaft end ensures that the two rotors remain in mesh, and 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.
3. Advantages:
The gas transport capacity.
Can operate stably within a large flow range.
Relatively low noise, suitable for environments with noise requirements.
The maintenance cost is relatively low and suitable for long-term continuous operation.
Structure type:
According to the shape of the rotor, it can be divided into two bladed and three bladed types. The vibration and noise of the three bladed rotor are lower.
4. Usage requirements:
The temperature of the intake medium shall not exceed 40 ℃.
The content of particulate impurities shall not exceed the specified value, and the particle size shall be smaller than the specified value.
2、 Roots vacuum pump
1. Definition and purpose:
Roots vacuum pump is a device used to create low-pressure environments.
Widely used in semiconductor manufacturing, vacuum packaging, coating and other fields.
2. Working principle:
Gas flow is formed by the rotation of two interlocked rotors inside the pump body.
The gap between the rotors is very small, which can effectively eliminate gas and achieve a vacuum state.
Roots vacuum pumps are usually not capable of pumping air independently and need to be used in conjunction with front-end pumps such as oil seals and water ring pumps.
3. Advantages:
Can quickly extract air.
During the extraction process, there will be no compression of the gas, making it suitable for handling temperature sensitive gases.
The structure is relatively simple, easy to maintain, and has a long service life.
4. Structure type:
According to the arrangement of the rotor, it can be divided into vertical, horizontal, vertical shaft, etc.
Performance parameters:
The speed can reach up to 3450-4100 revolutions per minute.
The pumping rate is between 30 and 10000 liters per second.
Extreme vacuum: Single stage is 6.5 × 10-3 Pa.
3、 Main differences
1. Working principle:
Roots blower mainly achieves gas compression and transportation through the rotation of the rotor.
The Roots vacuum pump achieves the purpose of pumping by generating gas flow through the rotation of the rotor.
2. Application areas:
Roots blowers are commonly used in applications that require high flow gas transportation, such as sewage treatment and pneumatic conveying.
Roots vacuum pumps are mainly used in applications that require low air pressure, such as semiconductor manufacturing, vacuum packaging, etc.
3. Performance characteristics:
Roots blower has the advantages of stability, low noise, etc.
Roots vacuum pumps have the advantages of fast pumping, sensitivity to gas temperature, and simple structure.
In summary, there are significant differences between Roots blowers and Roots vacuum pumps in terms of working principles, application areas, and performance characteristics. When making a choice, it should be judged based on specific usage needs.
