Hydraulic design method of half-spiral water-sucking chamber for pump

Abstract

The invention provides a hydraulic design method of a half-spiral water-sucking chamber for a pump. Maim geometrical parameters of the water-sucking chamber are determined through relations. The relations mainly comprise a cut-water angle Alpha, a cut-water included angle Gamma, an upside radius R1 of the water-sucking chamber, a cut-water access radius r1, a base circle radius R2, a downside radius R3 of the water-sucking chamber, a baffle length 1, a baffle included angle Theta, a baffle thickness Delta, an inlet first section radius Ra, an inlet second section radius Rb, an inlet second section length ab, an inlet second section width bb, an inlet third section radius Rc, an inlet third section length ac, an inlet third section width bc, an eight-section inlet radius b3, an eight-section inclined angle Omega, radiuses Ri of all sections, horizontal lengths Li of all the sections and heights hi of all the sections. According to the water-sucking chamber, the flowing condition is improved, a uniform velocity field can be obtained in the position of an inlet of an impeller, and the anti-cavitation performance of the pump is improved greatly at the same time.

Description

technical field [0001] The invention relates to a hydraulic design method of a semi-spiral water suction chamber for a pump, which is applicable to the hydraulic design of the water suction chamber of various pumps such as double-suction pumps, pipeline pumps, and multi-stage pumps, and is especially suitable for hydraulic performance and cavitation performance of the pump. And occasions with high fluidity requirements. Background technique [0002] The suction chamber is the part from the pump inlet flange to the impeller inlet, and its function is to introduce liquid into the impeller according to the required conditions. The flow state in the suction chamber directly affects the flow state in the impeller, and also has a certain impact on the pump efficiency, especially the cavitation performance of the pump. The requirements for the water absorption chamber are: to ensure that the impeller inlet has the required velocity field, such as uniform velocity distribution, app...

AI Technical Summary

Problems solved by technology

Zeng Wei and others invented a vertical pipeline pump annular suction chamber, which solved the technical problem of vortex loss caused by the use of straight partitions in the existing vertical pipeline pump suction chamber, and improved hydraulic efficiency.

[0005] However, there are only a small number of empirical formulas for the design of the water absorption chamber, and there is no specific design method. The actual design still relies too much on experience, and the main research also focuses on structural design.

Nowadays, cavitation is a hot field in fluid machinery, and the shape of the impeller alone cannot meet the requirements of anti-cavitation performance, and the shape of the pump suction chamber needs to be further improved.

Images