Jet pump with volute type flume

Abstract

The invention provides a jet pump with a volute type flume. The jet pump comprises a fluid pipeline B, a fluid pipeline A arranged outside the fluid pipeline B in a sleeving mode, a constricted tube, a throat tube and an expansion tube, wherein the constricted tube, the throat tube and the expansion tube are sequentially connected with the water outlet end of the fluid pipeline A. The volute type flume arranged outside the fluid pipeline B in a sleeving mode is arranged at the inlet end of the fluid pipeline A. The diameter of the water outlet end of the fluid pipeline A is decreased gradually in the water flowing direction. The constricted tube is a round tube with the diameter being decreased gradually. The throat tube is a straight tube. The expansion tube is a round tube with the diameter being increased gradually. The jet pump is easy to manufacture and install, the symmetry of internal flow of the jet pump is good, flowing is more stable, and hydraulic performance is improved; the flow losses are reduced, mixing of two fluids is promoted, and the efficiency is improved advantageously; the frictional hydraulic losses are reduced; and the jet pump is suitable for an annular jet pump as well as a central jet pump.

Description

technical field [0001] The invention relates to the technical field of fluid machinery, in particular to a jet pump with a volute type water diversion chamber. Background technique [0002] The jet pump is a fluid conveying machine that uses the turbulent diffusion of the fluid to transfer energy and mass. Due to its simple structure, easy maintenance, reliable operation, and no rotating parts, it has been widely used in many fields. Its working principle is: when the high-pressure working fluid passes through the nozzle, the velocity at the outlet of the nozzle increases sharply, the pressure decreases significantly, and a vacuum is formed. Under the action of the pressure difference between it and the suction port, the sucked fluid enters the pump through the sucked fluid pipeline. The body is mixed with the working fluid in the contraction chamber and delivered through the subsequent pipeline. According to the position of the nozzle, the jet pump is mainly divided into t...

AI Technical Summary

Problems solved by technology

Specifically, there are mainly the following two points: (1) First, if the symmetry of the internal flow cannot be maintained, the internal flow field will show a global and obvious deflection, which will deteriorate the internal flow condition; (2) Second, due to the The internal flow law of the pump, under the condition of low flow ratio, backflow phenomenon will occur in the contraction chamber of the jet pump

The asymmetry of the internal flow will lead to unstable position and size distribution of the return flow, which seriously affects the performance of the jet pump.

Therefore, if the axial symmetry of the flow in the pump is damaged to a large extent, the operating conditions of the pump will seriously deviate from its design conditions, resulting in a decrease in efficiency

[0004] In addition to destroying the symmetry of the internal flow of the jet pump, the T-shaped pipe in the existing design also has the following disadvantages or shortcomings: (1) It is not optimized for the flow at this place, so that the fluid at this place will have a large impact with the pump body The frontal collision caused a large loss; (2) the mixing of the working fluid and the sucked fluid could not be well promoted

However, these measures are either space-constrained, drastically reduce the efficiency of the jet pump, or provide extremely limited improvements to the internal flow

None of the existing technologies can fundamentally solve this problem

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