Roots blower is a common centrifugal fan, which is widely used in industry, environmental protection, mining and other fields, and is favored for its excellent performance, high efficiency and low noise.
In the design and manufacture of roots blowers, impeller clearance is a very important parameter, which directly affects the performance and life of the fan.
So, how much is the appropriate impeller clearance for roots blowers?
First of all, we need to understand the structure and working principle of roots blower.
A roots blower consists of two coaxially rotating impellers, and the gap between them is called the impeller clearance.
When the roots blower is working, through the narrow space of the impeller gap, the gas is drawn from the air inlet and then pushed to the air outlet by the rotation of the impeller, forming a continuous air flow.
Therefore, the size of the impeller clearance directly affects the gas delivery capacity and efficiency of the roots blower.
In fact, there is no fixed standard for the size of the impeller clearance of roots blowers, and it will vary according to different working conditions.
In general, the impeller clearance should be within the appropriate range and should neither be too large nor too small.
If the impeller clearance is too large, it will lead to gas leakage and reduce the efficiency of gas delivery; If the impeller clearance is too small, it will increase the friction and wear of the impeller and shorten the service life of the roots blower.
So, how to determine the size of the roots blower impeller clearance?
Specifically, there are several factors to consider:
1.Gas characteristics: Different gases have different viscosities and compressibility, which affects the flow and compression of the gas in the impeller gap.
Therefore, when determining the size of the impeller gap, it is necessary to consider the viscosity and compressibility of the gas to the gas delivery efficiency of the roots blower.
2.Impeller material: The impeller of roots blower is usually made of cast iron or steel, and these materials have different hardness and wear resistance, which will affect the size of the impeller clearance.
In general, the higher the impeller hardness, the smaller the impeller clearance should be.
3.Working temperature: When the roots blower works in a high-temperature environment, the impeller material will expand and the impeller clearance will become smaller; When working at low temperatures, the opposite is true.
Therefore, the influence of operating temperature needs to be considered when determining the size of the impeller clearance.
To sum up, the size of the impeller clearance of roots blower needs to be reasonably determined according to the specific working conditions.
Generally speaking, the impeller clearance size should be 01-0.3mm.
Of course, in practical applications, it is also necessary to optimize and adjust according to the specific situation to achieve the gas delivery efficiency and service life.