Fixed guide vane body inlet angle adjustable axial flow pump

Abstract

The invention relates to the technical field of water pumps, in particular to a fixed guide vane body inlet angle adjustable axial flow pump which comprises an impeller chamber (9), a water inlet horn mouth (8), an impeller body (10), a guide vane body (1) and a pump shaft (2). The guide vane body (1) comprises a plurality of guide vanes (3) and a dispersing pipe. The axial flow pump further comprises an adjusting system which comprises a control unit, a middle unit and an executing unit. According to different working conditions, a proper guide vane inlet angle is adjusted, so that the guide vane inlet angle is matched with an impeller flow-out angle, the circular rector of the fixed guide vane body is changed, accordingly, stress is improved, then, hydraulic loss such as impact and streaming around is lowered, energy loss is lowered, the operation stability of the pump is improved, and finally the purpose of axial flow pump performance improving is achieved.

Description

technical field [0001] The invention relates to the technical field of water pumps, in particular to an axial flow pump with an adjustable inlet angle of a fixed vane body. Background technique [0002] Axial flow pump is a widely used hydraulic mechanical device. It has the characteristics of large flow and low head, and is widely used in large-scale farmland drainage and irrigation and water transfer projects. The extensive use of axial flow pumps will inevitably increase the demand for energy. Therefore, reducing the hydraulic loss of axial flow pumps and improving their efficiency is of great significance to energy conservation and emission reduction. [0003] In order to improve the efficiency of the axial flow pump, methods such as optimizing the structural design of the impeller and the flow channel can be used, but this method generally consumes relatively high costs. Considering that the absolute velocity of the impeller outlet of the axial flow pump has a certain ...

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Problems solved by technology

[0004] However, the guide vanes of traditional axial flow pumps are designed according to the rated working conditions and fixed on the hub of the guide vane body at a certain installation angle, which cannot be adjusted accordingly with changes in working conditions.

However, when the axial flow pump operates under non-design conditions, there is an attack angle between the placement angle of the guide vane body and the liquid flow angle at the outlet of the impeller, which is prone to impact loss

At the same time, according to the design experience, the inlet side of the guide vane is generally parallel to the outlet side of the impeller, and the distance between them should be (0.05-0.1) D. If the distance is not designed properly, it will easily lead to unstable operation of the axial flow pump, thereby affecting its efficiency.

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