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Jet pump with volute type flume

A water diversion chamber and volute type technology, applied in the field of jet pumps, can solve problems such as internal flow field deflection, operating condition deviation, loss, etc., and achieve the effects of reducing hydraulic loss along the process, uniform flow velocity distribution, and improved hydraulic performance

Inactive Publication Date: 2016-12-14
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Jet pump with volute type flume
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  • Jet pump with volute type flume

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: This embodiment is a volute type water diversion chamber annular jet pump. Among them, fluid A is the working fluid, which enters from the inlet pipe 1; fluid B is the sucked fluid, which enters from the inlet pipe 2. The structure at the nozzle is as attached Figure 4 shown. When the working fluid A passes through the volute-type water diversion chamber, its frontal impact with the wall is relieved due to its drainage effect, and the flow parameters such as mass flow rate, velocity, and pressure of the fluid on the circular section of the working fluid transition pipe are distributed. Uniformity, suppressing the adverse effects caused by flow asymmetry, greatly improving the internal flow of the jet pump and increasing the efficiency. In addition, due to the function of the volute-type water diversion chamber, the working fluid A flows forward in a spiral shape, which is easier to mix with the sucked fluid B, and the length of the throat can be reduced...

Embodiment 2

[0034]Embodiment 2: This embodiment is a volute type water diversion chamber center jet pump. Among them, fluid A is the sucked fluid, which enters from the inlet pipe 1; fluid B is the working fluid, which enters from the inlet pipe 2. The structure at the nozzle is as attached Figure 5 shown. When the sucked fluid A passes through the volute-type water diversion chamber, its frontal impact with the wall is relieved due to its drainage effect, and the mass flow rate, velocity, pressure, etc. of the fluid flow on the circular section of the sucked fluid transition pipe The parameters are evenly distributed, which suppresses the adverse effects caused by flow asymmetry, greatly improves the internal flow of the jet pump, and improves the efficiency. In addition, due to the function of the volute-type water diversion chamber, the sucked fluid A flows forward in a spiral shape, which is easier to mix with the working fluid B, and the length of the throat can be reduced by 20%-...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04F5/10F04F5/44
CPCF04F5/10F04F5/44
Inventor 龙新平程怀玉季斌
Owner WUHAN UNIV
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