An inlet pre-swirl adjustment device and its adjustment method based on mixed-flow pump flow tracking

Abstract

The invention discloses an inlet pre-rotation adjusting device based on mixed flow pump flow tracking. The device comprises an outer pipeline sleeve, a middle connecting sleeve and an annular adjusting device which are coaxially arranged, wherein a copper coil is wound at the middle part of the inner wall of the middle connecting sleeve, the two ends of the inner wall of the middle connecting sleeve are provided with a rotating speed probe and an electric brush correspondingly, and the two top ends of the inner wall of the middle connecting sleeve are fixedly provided with embedded fixing seats; the annular adjusting device is arranged between the embedded fixing seats; the annular adjusting device comprises an annular blade base, a copper coil is wound on the outer wall surface of the blade base, and a reflecting line and a sliding ring are arranged at positions corresponding to the rotating speed probe and the electric brush correspondingly; and adjusting blades are uniformly arranged on the inner wall of the blade base in the circumferential direction. The operation efficiency of a mixed flow pump is improved by monitoring the working flow of the mixed flow pump in real time andadjusting the inflow angle of an inlet of the mixed flow pump in time, so that stable operation under a bias design working condition is realized.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery (pump) internal flow, and in particular relates to an inlet pre-swirl adjustment device and an adjustment method based on flow tracking of a mixed flow pump. Background technique [0002] Mixed-flow pumps have been widely used in the fields of sewage treatment, mining, power generation, flood control and drainage due to their large flow and moderate head, and have become an important basic equipment in national production and life. In the field of mixed-flow pump design, the mixed-flow pump is always designed based on the equal circulation hydraulic design method of a certain rated working condition, which adopts the assumption that the inlet has no rotation and cylinder independence, so only when the mixed-flow pump operates under the rated working condition When the impeller inlet placement angle is equal to the fluid inflow angle, the internal flow field is the most stable and the effic...

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Problems solved by technology

It is also possible to prevent pre-rotation at the inlet of the mixed-flow pump by setting two symmetrically distributed pre-rotation ribs in the water inlet horn tube. Consider the situation that the mixed flow pump is working in a deviation from the design condition, and it prevents the change of the inlet flow angle of the pump in other working conditions, which is not conducive to the operation of the mixed flow pump in multiple working conditions

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