Jet pump

Abstract

The invention provides a jet pump, and relates to a mixed flow jet apparatus. The jet pump is composed of a current distributing assembly, an inner pipe assembly and an outer sleeve assembly which have a same shaft core, wherein the current distributing assembly and the inner pipe assembly are fixedly connected in series, thereby forming a blind top centre cavity and a centre mixing tube; the outer sleeve assembly is sleeved outside the current distributing assembly and the inner pipe assembly, thereby forming an annular mixing chamber, an annular mixing pipe, a total mixing chamber and a total mixing output pipe; an internal ring nozzle and an external ring nozzle are arranged between the current distributing assembly and the inner pipe assembly, a mainstream body sprayed by the internal ring nozzle carries out jet-suction on a secondary fluid of the blind top centre cavity so as to spray to the centre mixing tube, and the secondary fluid is mixed in the centre mixing tube so as to output a centre mixed flow; a mainstream body sprayed by the external ring nozzle carries out jet-suction on a secondary fluid of the blind top centre cavity so as to spray to the annular mixing pipe, and the secondary fluid is mixed in the annular mixing pipe so as to output an annular mixed flow; and the two mixed flows are mutually injected to enter the total mixing chamber and the total mixing output pipe so as to further output in an isotrope voltage-sharing manner. The jet pump provided by the invention has the advantages of smaller weight and axial direction size, high injection rate, great suction force and good property in large flow.

Description

technical field [0001] The invention relates to a mixed flow injection device, in particular to a jet pump used for mixed fluid injection. Background technique [0002] Ejector pump, also known as injector, jet pump, jet pump, is a device that injects low-pressure (or suction pressureless) secondary fluid with relatively high-pressure primary fluid, and completes the primary fluid pumping of secondary fluid. Since the injector has no moving parts, it is reliable and widely used in fluid equipment in various fields. [0003] The existing injector is composed of a set of main fluid inlet pipe, main fluid nozzle, secondary fluid inlet pipe, mixing chamber, mixing pipe or mixing diffuser; the secondary fluid passing into the mixing chamber is sucked by the main fluid jet ejected from the nozzle Into the mixing tube, mixed in the mixing diffuser to equalize the output. The mixing tube of such injectors is generally a single elongated circular tube, such as a typical Venturi tub...

AI Technical Summary

Problems solved by technology

Because of the occlusion of the surrounding streams or peripheral jet beams, it is difficult for the surrounding secondary fluid to be drawn into the inner area of ​​the central jet, and the entrainment is still mainly carried out around the mixing chamber, which will inevitably reduce the ability of the main fluid to pump the secondary fluid and reduce the jet flow. The approximate injection ratio or pumping capacity of the pump

[0008] Existing injectors mainly rely on the turbulent diffusion of the jet in the long stroke of the mixing tube to mix the primary fluid and the secondary fluid. The turbulent diffusion of the jet requires a process of development and strengthening in the mixing tube. Therefore, all injectors must have slender mixing tubes (or mixing diffuser tubes), and large-diameter injectors need large-diameter mixing tubes. The larger the diameter, the more difficult it is to form uniform mixing by jet turbulent diffusion. In order to make the main fluid and If the entrained secondary fluid can be fully mixed, mass-transferred and pressure-equalized in the mixing tube, the length of the mixing tube needs to be greatly increased, resulting in the axial size and space occupation of existing injectors, especially large-scale single-tube injectors. And the disadvantage of excessive weight

This is very unfavorable for installation and use in many occasions that require small volume and light load

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