Roots blower is advanced in design and reasonable in structure. There are gaps between rotors and between rotors and pump bodies. They do not contact each other, do not need lubrication, and have small friction loss. It can obtain larger pumping speed with lower power, which has significant energy-saving effect. Roots blower has stable large pumping speed, which can quickly discharge the gas suddenly discharged, making up for the shortcomings of oil sealed mechanical pump and diffusion pump, and is suitable for use as a mechanical booster pump. It has a stable large pumping speed, and can quickly discharge the suddenly released gas, which makes up for the shortcomings of oil sealed mechanical pump and diffusion pump, and is suitable for use as a mechanical booster pump.
The rotor of Roots blower has good geometric symmetry and works stably. It can obtain large pumping speed by increasing the rotating speed, thus achieving compact structure, small volume and light weight.
There is no gas compression in the pump chamber, and there is a gap between moving parts, which is insensitive to dust and water vapor in the aspirated gas, so condensable steam can be extracted. The moving parts in the pump cavity do not need oil lubrication, which can avoid the pollution of oil vapor to the vacuum system and is conducive to obtaining oil-free vacuum.
Roots blower does not need inlet and exhaust valves, with simple structure, low noise, non-contact moving parts in the pump chamber, and low maintenance cost. Roots blower starts quickly and can reach the limit vacuum in a short time.
Calculation method of Roots blower speed:
There are two transmission modes of Roots blower: direct connection and belt connection. Usually, belt transmission is used. Because the speed of the direct connected blower is synchronous with the speed of the motor, while the speed of the ordinary 4-level motor is 1470 rpm. The cost of using other technologies is high, so most of the companies generally use 4-level motors. Belt transmission is economical and durable.
V-belt transmission is faced with this problem. The speed of Roots blower is different from that of motor, which can be calculated by the following formula: motor speed * motor speed=fan speed * fan speed
It is not difficult to see from this formula that as long as the size of the Roots blower pulley is constant, and the rotation speed of the Roots blower can be found from the instructions through the requirements of flow and pressure parameters, the rotation speed of the Roots blower must also be good, and the rotation speed of the motor is also constant, then it is easy to calculate the size of the motor pulley.
Wear degree of Roots blower parts:
1. Initial wear stage The initial wear stage is the stage of material wear. At this time, the uneven places on the surface between blower parts, as well as the oxide layer and decarburized layer, due to the operation of Roots blower parts, the mutual friction force is quickly smoothed. As the impeller of Roots blower runs without friction in the body, it does not need lubrication, so the discharged gas does not contain oil. It is the ideal pneumatic conveying gas source for chemical industry, food industry and other industries. At this time, the equipment can show high production efficiency, but this period of time is relatively short.
2. Normal wear stage This stage is the second stage of material wear. Generally, the wear of Roots blower parts increases at a constant speed and slowly with time. The equipment can have high productivity and processing quality, and this stage takes a long time.
3. Sharp wear stage This stage is the third stage of material wear. At this time, the normal wear relationship has been destroyed, resulting in a sharp increase in wear. Later, the stainless steel blower parts were damaged and the equipment stopped. Roots blower is a volumetric blower. When in use, the flow changes little with the change of pressure. However, the flow varies with the speed. Therefore, the selection range of pressure is very wide, and the selection of flow can be achieved by selecting the speed.
As the impeller of Roots blower operates in the body without friction, it does not need lubrication, so that the discharged gas does not contain oil. It is the ideal pneumatic conveying gas source for chemical industry, food industry and other industries. Before that, the precision, performance and productivity of the equipment were greatly reduced. Therefore, it is generally not allowed to use the roots blower parts to the severe wear stage. When the roots blower parts tend to the later stage of the normal wear stage, they should be repaired or replaced, and the time of this stage is also short.
I believe that after reading the above contents, you should also understand the calculation method of Roots blower speed, and I hope it will be helpful to you.
Text label: Roots blower
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