A high-efficiency non-equal-wrap angle guide vane body matching the annular pressurized water chamber

Abstract

The invention relates to an efficient non-uniform wrap angle guide vane body matched with an annular pumping chamber and belongs to the field of fluid machinery. The guide vane body is composed of blades (2) and a cover plate (3), the guide vane body is installed between an impeller (1) and the annular pumping chamber (4), and the blades (2) are fixed on the cover plate (3). The guide vane body is characterized in that the blades of the guide vane body are arranged in a non-uniform wrap angle mode in the circumferential direction. Parameters such as entrance and exit arranging angles of all the blades are identical, the exit flow field of the impeller is uniform, exit open area variation is improved, impeller stress and shaft bearing radial force are improved, and then pump efficiency is improved and instability caused by uneven distribution of radial force due to the change of the guide vane entrance position is relieved.

Description

technical field [0001] The invention relates to a high-efficiency non-equal wrap angle guide vane body matched with an annular pressurized water chamber, belonging to the field of fluid machinery. Background technique [0002] The vane body is a flow-passing part commonly used in pumps. In the design of the water pump, when the pressurized water chamber is designed to be ring-shaped due to structural reasons, the hydraulic performance of the impeller and its cooperation is low, and the guide vane body can collect and transport the liquid flowing from the impeller to the downstream, and transfer part of the kinetic energy of the liquid flow. It can be converted into pressure energy and eliminate the rotation of the liquid flow, which can significantly improve the pump efficiency; the guide vane body of the traditional design is symmetrically arranged along the circumferential direction, but according to the flow law of the fluid machine, the flow rate increases along the dire...

AI Technical Summary

Problems solved by technology

In the design of the water pump, when the pressurized water chamber is designed to be ring-shaped due to structural reasons, the hydraulic performance of the impeller and its cooperation is low, and the guide vane body can collect and transport the liquid flowing from the impeller to the downstream, and transfer part of the kinetic energy of the liquid flow. It can be converted into pressure energy and eliminate the rotation of the liquid flow, which can significantly improve the pump efficiency; the guide vane body of the traditional design is symmetrically arranged along the circumferential direction, but according to the flow law of the fluid machine, the flow rate increases along the direction of impeller rotation, and the symmetrical arrangement The cross-sectional area of ​​the guide vane channel remains unchanged, resulting in the uneven distribution of the liquid at the guide vane outlet along the circumferential direction, which increases the hydraulic loss in the guide vane body, reduces the efficiency of the pump, and even affects the operation stability of the pump; changing The arrangement of the guide vanes to adapt to the flow law of the fluid can improve the efficiency of the pump, but at the same time, it changes the hydraulic performance of the inlet side of the guide vanes, making the radial force distribution uneven, affecting the stability of the pump, and even causing vibration

[0003] The research on the guide vane body is currently focused on the optimization of factors such as blade profile, geometric parameters, and number of blades; Bing Hao studied the influence of different guide vane inlet placement angles and the distribution of placement angles along the streamline on the guide vane, Qian Han Xin introduced the test results of the influence of the fixed guide vane placement angle of the mixed flow pump and the gap between the impeller flange and the pump body front cover on the pump performance. Zhu Junhua optimized the axial flow pump from the allowable diffusion angle between two adjacent guide vanes. The number of guide vanes, Gao Bo proposed to match the non-stacked guide vane body of the annular pressurized water chamber, that is, to change the arrangement position of the guide vane blades to improve hydraulic performance and improve efficiency; the current research is based on uniform distribution and changing the guide vane distribution. The research object has not yet studied the performance of the guide vane from the linear distribution of the guide vane wrap angle along the circumference, so as to further improve the efficiency of the guide vane and improve the change of the outlet flow area, the force on the impeller and the radial force on the shaft, so it surpasses the traditional design And the current design of changing the distribution structure of the guide vane has practical significance for the study of the change of the guide vane along the circumference

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