Why can’t the pump deliver material when air gets in?
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There’s a reciprocating pump that keeps failing to deliver material; they say air has gotten into the pump. Why does air entering the pump prevent it from delivering material? How can this be understood?
This is a characteristic of centrifugal pumps; you can refer to relevant information on centrifugal pumps
Have you considered the levels of internal and external pressure?
A reciprocating pump is a positive-displacement pump. Liquids cannot be compressed, while gases can be compressed. Of course, you can’t have the pump produce gas.
A centrifugal pump expels liquid by rotating at high speed, creating a vacuum that allows the pump to draw in liquid. When air gets in, cavitation occurs, and the pump can no longer draw in liquid!
Agree with the person above: air is compressible, and when there is a certain pressure at the outlet, the air gets compressed. You can also take a look at this post: http://bbs.hcbbs.com/thread-787821-1-1.html
Generally, centrifugal pumps require priming, while reciprocating pumps have a certain degree of self-priming capability: L
Gas accumulation is likely to occur. A pressure difference cannot be established.
It is also necessary to understand the working principle of centrifugal pumps
Poster: The operation of a centrifugal pump consists of two parts: First, the fluid enters the pump chamber. II. The centrifugal pump throws the fluid out of the pump. As for the first part, under the action of centrifugal force, a vacuum zone is formed at the center of the pump; as a result, the fluid enters the pump under the influence of atmospheric pressure. In the case of air, since its density is low, the degree of vacuum created is small, and therefore the pressure difference between atmospheric pressure and the pressure inside the pump is not sufficient to force the fluid into the pump. Consequently, it appears that the pump is unable to deliver fluid.
Ah! O man! The original poster made it very clear – it’s about whether it’s a reciprocating pump or not!