Adjustable ejector

Abstract

The invention discloses an adjustable ejector, and belongs to the field of ejectors. The adjustable ejector is characterized in that a mixed diffuser is connected with internal threads at the front end of a low-pressure three-way pipe fitting through external threads at the rear end of the mixed diffuser, the front end of the mixed diffuser is connected with a metal braided hose through a movablejoint, and axial displacement of the mixed diffuser relative to the low-pressure three-way pipe fitting can be achieved by rotating the mixed diffuser, so that the axial distance (i.e. nozzle distance) of the outlet cross section of a nozzle to the inlet cross section of the mixed diffuser is changed; and meanwhile, a nozzle adjusting cone is arranged in the nozzle, and the circulation cross-sectional area of a nozzle throat can be changed by changing the axial position of the nozzle adjusting cone, so that the cross section ratio is adjusted. According to the adjustable ejector, on the premise of effectively avoiding mutual influence of double adjustment variables, independent adjustment of the nozzle distance and the cross section ratio of the ejector is achieved.

Description

technical field [0001] The invention relates to the field of injectors, in particular to an adjustable injector. Background technique [0002] The ejector can inject low-pressure steam through high-pressure steam, and is often used in processes such as vacuum flash evaporation. The high-pressure steam passes through the nozzle in the injector to form a supersonic airflow, and the low-pressure steam is inhaled and accelerated at the outlet of the nozzle. After the diffuser pipe of the pressure and mixing diffuser is further boosted, a stream of mixed vapor with a medium pressure is formed and discharged. [0003] The important index of injector performance is the injection coefficient, that is, the amount of high-pressure steam that needs to be consumed per 1kg of low-pressure steam pumped. Under the condition of certain pressure of high-pressure steam, low-pressure steam and mixed steam, the injection coefficient is affected by the structural parameters of the injector, esp...

AI Technical Summary

Problems solved by technology

However, in actual operation, it is found that such an approach will inevitably cause a change in the section ratio when adjusting the nozzle distance, resulting in the need to adjust the nozzle distance and the adjustment cone at the same time when the nozzle distance is required to be changed, which makes the adjustment process difficult.

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