Dual ring ejector

Abstract

The invention provides to a dual ring ejector, and relates to a fluid pump. An inner ring ejector apparatus is sequentially provided with a central time fluid inlet sleeve, an inner ring nozzle and a center mixing tube along an axle wire, a main stream annular cavity, an outer ring nozzle, an annular mixing room and an annular mixing tube are sequentially arranged on the periphery of the inner ring ejector apparatus along the axle wire by an outer ring ejector apparatus, a main stream inlet tube is communicated with an inner ring nozzle inlet and an outer ring nozzle inlet through the main stream annular cavity, the annular mixing room is communicated with an outer ring stream inlet tube and the annular mixing tube, an outer ring nozzle outlet is convex and protrudes into the annular mixing room and faces to the annular mixing tube, the two outlets of the mixing tubes are jointly communicated with a general mixing output tube, the same main stream is used by the inner ring ejector and the outer ring ejector for pumping time fluid, and after being mixed, the pumped time fluid enters the general mixing output tube for outputting. According to the dual ring ejector, the weight is light, the size in axial direction is small, the absorbing and ejecting rate is high, and the ejector performs well with mass flow and has various structure forms. The main stream can be used for injecting and mixing one or two time fluids, so as to realize output under uniform pressure.

Description

technical field [0001] The invention belongs to a fluid pump, and relates to an injector for mixed fluid, in particular to a double-ring injector for mixed fluid injection. Background technique [0002] Ejector, also called jet pump, is a device that injects low pressure (or no pressure) secondary fluid with relatively high pressure primary fluid, and completes primary fluid suction secondary fluid for mixed flow delivery. Since the injector has no moving parts, it is reliable and widely used in fluid equipment in various fields. [0003] Existing injector is made up of main fluid inlet pipe, main fluid nozzle, secondary fluid inlet, mixing chamber, mixing pipe or mixing diffuser; The main fluid jet out is sucked into the mixing tube, mixed in the mixing diffuser and output with equal pressure. The mixing tube of such injectors is generally a single elongated circular tube, such as a typical Venturi tube. [0004] British Patent Application Publication No. WO2006 / 010949 d...

AI Technical Summary

Problems solved by technology

[0005] 1. The existing injectors mainly rely on the turbulent diffusion of the jet in the long stroke of the mixing tube to make the main fluid and the secondary fluid mix with each other. The turbulent diffusion of the jet needs a development and strengthening in the mixing tube. Therefore, the injector must have a slender mixing tube (or mixing diffuser tube), and a large-diameter injector needs a large-diameter mixing tube. The larger the diameter, the more difficult it is to form uniform mixing by jet turbulent diffusion. If the body and the entrained secondary fluid can be fully mixed in the mixing tube for mass transfer and pressure equalization, the length of the mixing tube needs to be greatly increased, resulting in the axial size and space of the existing ejector, especially the large-scale single-tube injector. Disadvantages of space occupation and excessive weight

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

[0006] 2. For single-pipe injectors or jet pumps with large passage and flow rates, a large passage through the mixing pipe is required. In order to achieve the purpose of pumping the secondary fluid well (that is, to achieve a large injection ratio or a high mixed output pressure), it is necessary to maintain a certain Throat surface ratio (section ratio of the mixing tube to the main fluid nozzle) so that the free jet of the main fluid can diffuse and fill the mixing tube after reaching a certain opening, resulting in a piston suction effect. It is necessary for a single-tube injector with a large passage and flow rate A larger-diameter nozzle section and a main jet with a large-diameter beam are required, but the main fluid jet is located in the center of the mixing chamber, and the secondary fluid is entrained around the main fluid jet. The larger the diameter of the main fluid jet, the larger the mainstream per unit volume The lower the contact rate and entrainment efficiency between the body and the secondary fluid, that is, the lower the ejection coefficient or ejection ratio

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 suck the secondary fluid (both attracting Injection ratio), so for most injectors that require as much suction as possible, their low injection efficiency is the main shortcoming

[0007] 3. The existing injector only has a channel structure for injecting and mixing the primary fluid (working fluid) to the secondary fluid, so that only one primary fluid can be mixed with one secondary fluid at equal pressure, resulting in simple functions. It cannot meet the requirements of some occasions where one main fluid injects two secondary fluids at the same time, mixes and equalizes the pressure, and the scope of application is limited.

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