Cavitation prevention slurry pump

Abstract

The invention discloses a cavitation prevention slurry pump. The cavitation prevention slurry pump comprises a pump body. The pump body is provided with a suck-in opening and a discharge opening. An impeller is arranged in the pump body and provided with main blades and induction blades. The induction blades extend into the suck-in opening. The main blades and the induction blades are connected. The cross section area of the suck-in opening is 3 to 10 times of the cross section area of the discharge opening. The invention aims at providing the slurry pump which can prevent cavitation and can convey high-concentration two-phase flow or high-vapor-content three-phase flow.

Description

technical field [0001] The invention relates to the field of rotary power pump equipment, in particular to a centrifugal pump for conveying abrasive media. Background technique [0002] In industries such as mineral processing and smelting, centrifugal pumps are often used to transport some abrasive solid-liquid two-phase flows, and slurry pumps are often used. Common slurry pumps are usually made of wear-resistant alloys such as Cr26 and Cr15Mo3. They can be used normally when conveying some low-concentration solid-liquid two-phase flow media, but they can be used normally when conveying high-concentration, especially solid-liquid two-phase flow. When it is more than 55%, ordinary slurry pumps show the following problems: 1. The wear problem is prominent, and the life of the flow-passing parts often cannot meet the service requirements. 2. The anti-cavitation performance is poor. This is because as the concentration of the two-phase flow increases, the fluidity of the medi...

AI Technical Summary

Problems solved by technology

Common slurry pumps are usually made of wear-resistant alloys such as Cr26 and Cr15Mo3. They can be used normally when transporting some low-concentration solid-liquid two-phase flow media, but they can be used normally when transporting high-concentration, especially solid-liquid two-phase flow. When it is above 55%, ordinary slurry pumps show the following problems: 1. The wear problem is prominent, and the life of the flow-passing parts often cannot meet the service requirements

2. The anti-cavitation performance is poor. This is because as the concentration of the two-phase flow increases, the fluidity of the medium continues to decrease, and the NPSH is much smaller than that of clean water, resulting in cavitation when the flow rate of the pump is much lower than the calibration value. Not only the wetted parts are easily damaged, but the performance of the pump such as efficiency, head, flow, etc. are obviously reduced

Practice shows that this technical solution can better solve the above-mentioned problems of ordinary slurry pumps; however, the shortcomings of this technical solution are also exposed in practice. One is that the production cost is high, which leads to a decline in the competitiveness of the product; The two impellers are threaded together, so that the dynamic and static balance of the impeller is related to the tightening position of the thread (that is, after the two impellers are screwed to a certain position to balance the combined impeller, if you continue to tighten the combined impeller When the thread is connected, the balance will be destroyed), and it is very difficult to realize the dynamic balance or static balance of the rotor in the process. Damage to the main shaft and other components

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