Abstract
In this article, three types of high-speed mine submersible pumps were designed and experimented. During the reliability performance test, the axial thrust balancing device of GFQ150-700 was overloaded and damaged due to an unsuitable designed value of axial thrust. The designed hydraulic axial thrust with the actual value is compared in this article, and the reason for axial thrust deviation is discussed. Results show that axial thrust of the theoretical calculation is close to the numerical simulation value at a certain extent. GFQ100-1000 obtains the maximum theoretical axial thrust, while the maximum simulated value is produced in GFQ150-700, and that is corroborated by experiments. The axial blade force is related to the pump stage and area differences between the blade suction and pressure surface. Due to the increasing stage in GFQ100-1000, the axial blade force increases to a remarkable value in an opposite direction with respect to GFQ150-700. The opposite blade force offsetting other hydraulic forces in GFQ100-1000 is responsible for the maximum hydraulic axial thrust emerges in GFQ150-700 instead of GFQ100-1000.
Highlights
The prevention of mine water disaster is one of the important issues for the safety and efficient production of coal mine, and the level of prevention depends on water control technology and equipment.[1]
When the flow rate increases, the decrease in the axial thrust generated by the unequal of the pressure area is faster than the pressure difference, which increases the blade force
The initial test situation of the GFQ150-700 unit indicates that its axial thrust exceeds the ultimate limit of the original thrust institution
Summary
The prevention of mine water disaster is one of the important issues for the safety and efficient production of coal mine, and the level of prevention depends on water control technology and equipment.[1] When mine water inrush happens, the capacity of instantaneous gushing water will be more than the maximum drainage capacity of the pump house, which will cause flooding accident. High-power submersible pump is the major equipment of coal mine productive drainage rescue.[2] With high flow rate and head, high-power submersible pump can quickly drain the water in the mine.[3] Due to the heavy and large size of the pump and the limitation of the mine shaft cage size and underground space, it will extend the rescue time if the pump is split and reassembled underground.[4,5] Besides, frequency technology is applied in high-speed mining submersible pumps to improve the speed, and it leads to the strict requirement of the pump with high head, small size and low weight.
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