A multistage centrifugal pump

Abstract

The invention relates to a multistage centrifugal pump, comprising a pump body, a rotating shaft, a first impeller, a second impeller, a third impeller and a switching mechanism; a rotating shaft is rotatably connected in the pump body; the rotating shaft is fixed in sequence from left to right A first impeller, a second impeller and a third impeller are connected; a first water inlet is formed on the left side of the first impeller and the pump body, and a first water outlet is formed on the right side of the first impeller and the pump body; the second A second water suction port is formed on the left side of the impeller and the pump body, a second water outlet is formed on the right side of the second impeller and the pump body; a third water suction port is formed on the left side of the third impeller and the pump body, and the right side of the third impeller is formed A third water outlet is formed with the pump body; the left side of the pump body is provided with an inlet A that communicates with the first water suction port; the right side of the pump body is provided with an outlet B; the present invention can be used according to actual conditions by setting a switching mechanism The working condition automatically adjusts the number of impeller stages, changes the head of the multi-stage centrifugal pump, reduces energy consumption and saves costs; changes the number of effectively working impellers through mechanical transmission, which is simple to switch, saves time, and works stably.

Description

technical field [0001] The invention belongs to the technical field of fluid pumps, in particular to a multistage centrifugal pump. Background technique [0002] The centrifugal pump works by rotating the impeller to cause the liquid to move centrifugally. Static pressure energy, so the liquid flows out along the discharge port at a higher pressure. At the same time, a certain vacuum is formed at the center of the impeller because the liquid is thrown out, and the pressure at the liquid surface is higher than that at the center of the impeller. Therefore, the liquid in the suction pipeline enters the pump under the action of the pressure difference, the impeller keeps rotating, and the liquid is continuously sucked and pressed out. [0003] The problem of "big horse-drawn trolley" is common in multi-stage centrifugal pumps in practical work. This is due to the unreasonable flow and head of the selected equipment or the change of process conditions during the design and sel...

AI Technical Summary

Problems solved by technology

[0003] Multi-stage centrifugal pumps generally have the problem of "big horses and small carts" in actual work. This is due to the unreasonable flow and head of the equipment selected during design and selection or changes in process conditions, resulting in the additional head of the centrifugal pump. The margin is too large, the operating efficiency is low, and the power consumption is large

Generally, technical transformation is carried out by reducing the number of impellers, but this method is complicated to disassemble and take a long time, and the centrifugal pump is prone to unstable operation after transformation

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