The innovative design of the impeller structure of the medium and low head cooling pump has a significant impact on its head-flow curve. The impeller is the core component of the cooling pump, and changes in its structural parameters directly affect the hydraulic performance of the pump.
First, the number of blades in the impeller is a key factor. When the number of blades is increased, the efficiency of liquid being thrown out can be improved within a certain range, so that the flow rate of the pump will be increased to a certain extent at the same speed. Because more blades can better guide the water flow and reduce the turbulence and backflow of the water flow. However, too many blades may cause blockage of the flow channel and increase hydraulic loss, causing the head to show a downward trend in the high flow area. The slope of the head-flow curve gradually decreases and the curve becomes flatter.
Secondly, the exit angle of the blade is also extremely important. A larger blade outlet angle will cause the liquid to obtain a larger tangential velocity component, which can provide a higher lift when the flow rate is small. However, as the flow rate increases, the head will drop rapidly due to the inertia of the liquid flow and the increase in hydraulic losses in the flow channel, causing the head-flow curve to decline sharply in the high flow section. On the contrary, a smaller blade exit angle will make the head-flow curve flatter and maintain a relatively stable head in a larger flow range, but the overall head value may be relatively low.
Furthermore, the hub ratio of the medium and low head cooling pump impeller affects the size and shape of the flow channel. A smaller hub ratio means that the flow channel area is relatively large, which is conducive to the passage of liquid under large flow conditions, so that the flow rate can increase within a large range while the head decreases slowly, and the head-flow curve extends further to the lower right. gentle. A larger hub ratio may produce a higher head at low flow, but the space for flow increase is limited, the curve is steeper and the head quickly enters a sharp drop zone.
When designing innovative impeller structures for medium and low head cooling pumps, factors such as the number of blades, outlet angle, hub ratio, etc. need to be comprehensively considered. Through reasonable optimization and combination, a head-flow curve that meets the needs of different working conditions can be obtained, thereby improving the efficiency of the cooling pump. Overall performance and adaptability.
