Efficient ejector

Abstract

The invention discloses an efficient ejector. The ejector comprises a working nozzle, a receiving chamber, a mixing chamber and a diffusion chamber, wherein the working nozzle, the receiving chamber,the mixing chamber and the diffusion chamber communicate with one another; the working nozzle comprises a tapered section and a diverging section, wherein the tapered section is located at the upstream of a throat according to the flow direction with the flow cross-sectional area gradually reduced in the direction of fluid flow, and is connected with a working fluid inlet; the diverging section islocated at the downstream of the throat according to the flow direction with the flow cross-sectional area gradually increased in the direction of fluid flow; and the tapered section comprises a front section and a rear section, wherein the change of the flow cross-sectional area of the rear section is more gradual than that of the front section. According to the efficient ejector, the tapered section of the working nozzle adopts a Vitosinsky type line, so that the speed change of working fluid and injection fluid is more gradual, the energy loss is reduced, and the injector efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery, and in particular relates to a high-efficiency injector. Background technique [0002] The injector is a device that injects low-pressure fluid with high-pressure fluid to obtain fluid with intermediate pressure. The injector is generally composed of four parts: a working nozzle, a receiving chamber, a mixing chamber and a diffusing chamber. It has simple structure, low cost, Reliable operation and other advantages, it is widely used in refrigeration, material transportation, deodorization and other fields in industry and agriculture. [0003] The working principle of the ejector is that the high-pressure working fluid flows through the working nozzle for adiabatic expansion, forming a low-pressure and high-speed flow at the outlet of the nozzle, and then ejecting the ejector fluid into the receiving chamber and mixing chamber in turn, and the two fluids are fully mixed into the In the d...

AI Technical Summary

Problems solved by technology

[0005] Although the injector with the above-mentioned structure improves the system efficiency to a certain extent, its performance is closely related to its own structure. The main loss is that the speed of the working fluid and the injection fluid are different before mixing, resulting in vortex phenomenon, and the mixing process. Shock wave phenomenon after mixing

According to the Bernoulli equation, the working fluid expands adiabatically in the working nozzle of the injector, and part of the pressure potential energy is converted into kinetic energy. The energy conversion efficiency is related to the fluid state parameters and the structural size of the nozzle; Affected by the shape line of the shrinking section of the receiving chamber, improper use of the shape line will generate eddy currents and increase the energy loss of the injector

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