Centrifugal coal water slurry pump

Abstract

The invention provides a centrifugal coal water slurry pump, which is a vertical single-stage cantilever type centrifugal pump. The centrifugal coal water slurry pump comprises a pump base, a pump frame, an inlet elbow, a water outlet section, a bearing support, a bearing assembly, a shaft, a driving assembly and an impeller, the inlet elbow is connected with the pump base, the water outlet section is respectively connected with the pump base and the pump frame, the bearing support is connected with the pump frame, the bearing assembly is arranged on the bearing support, the shaft is fixed on the bearing support and the bearing assembly, the driving assembly is used for driving the shaft to rotate, the impeller is arranged on the front end of the shaft, the impeller, which is of a closed structure, comprises a front cover plate, main blades and a back cover plate, the center of the front cover plate is an impeller inlet, the main blades are arranged between the front cover plate and the back cover plate and integrated with the front cover plate and the back cover plate, the main blades are a plurality of long blades and a plurality of short blades, the long blades and the short blades are alternately arranged at intervals, so that impeller flow passages are formed, and at one side of the impeller flow passages, which is close to the impeller inlet, the long blades are longer than the short blades.

Description

technical field [0001] The invention relates to the field of centrifugal pumps, in particular to a centrifugal coal-water slurry pump. Background technique [0002] In the prior art, in the gasification section of coal chemical industry projects, most manufacturers adopt the coal water slurry process and the coal water slurry gasification process. In the coal water slurry gasification process, the low pressure coal water slurry pump More and more manufacturers choose centrifugal coal-water slurry pumps, and practice has proved that it is an ideal product to replace diaphragm and screw low-pressure coal-water slurry pumps. [0003] Due to the limitation of coal mill specifications and other factors, the flow rate of low-pressure coal-water slurry pump is small, the head is high, the specific speed of the pump is small, and the concentration of coal-water slurry is high. an important factor to consider. Reducing wear and erosion requires reducing pump speed. To achieve the ...

AI Technical Summary

Problems solved by technology

In this way, there are two problems: one is that the large number of blades will cause serious displacement at the inlet, and increase the total friction area, resulting in a decline in pump performance; Diffusion is serious, which in turn will lead to a decrease in pump performance

When the radial force is too large, it will cause excessive deflection of the shaft and cause the deflection of the impeller

If the above situation exceeds the clearance range between the impeller and the pump body, it will affect the smooth operation of the pump and the impeller will be stuck or worn, causing serious failure of the pump or reducing the performance of the pump, resulting in production accidents

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