High Vacuum Ejector With Nested Ring Nozzle
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Solution Overview
Problem
Existing vacuum ejectors face a compromise between achieving high vacuum levels and high volume flow rates, with multi-stage designs often requiring a large footprint and complex configurations to optimize performance.
Innovation Solution
The design incorporates a first stage with a drive nozzle and a ring drive nozzle that accelerates compressed air to generate a drive jet and a drive ring, which is directed into an exit expansion nozzle to enhance airflow and entrainment, allowing for higher vacuum levels while maintaining a small footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a multi-stage ejector design is used to achieve high vacuum levels, then the vacuum level is improved, but the device complexity and footprint increase
Solution Approach 1:
The ejector is divided into multiple stages with each stage having its own drive nozzle and expansion nozzle, allowing independent optimization of each stage's performance while achieving high vacuum levels through cumulative effect
Solution Approach 2:
The expansion nozzles are nested within the drive nozzles of subsequent stages, with each expansion nozzle positioned inside the drive nozzle of the next stage, creating a compact nested arrangement that reduces overall footprint while maintaining multiple stages
2Stress or pressure
If the number of stages is increased to improve vacuum level, then the vacuum level is improved, but the footprint of the device increases
Solution Approach 1:
The expansion nozzles are nested within the drive nozzles of subsequent stages, with each expansion nozzle positioned inside the drive nozzle of the next stage, creating a compact nested arrangement that reduces overall footprint while maintaining multiple stages
Solution Approach 2:
The ejector stages are arranged in a axial direction with nested configuration, utilizing the longitudinal dimension rather than expanding radially, thereby achieving multiple stages without increasing the footprint
3Productivity
If nozzles are tailored to produce high-volume flow rate, then the volume flow rate is improved, but the negative pressure is reduced
Solution Approach 1:
The ejector is divided into multiple stages with each stage having its own drive nozzle and expansion nozzle, allowing independent optimization of each stage's performance while achieving high vacuum levels through cumulative effect
Solution Approach 2:
The nozzles are designed with specific geometric parameters (converging and diverging sections) that optimize the balance between flow rate and pressure differential for each stage, with the overall system achieving both high volume flow rate and high negative pressure through multi-stage cumulative effect
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables the generation of high vacuum levels with improved airflow efficiency and reduced size, addressing the need for compact, high-performance vacuum ejectors.
Implementation Method 1
accelerating the high pressure air through a drive nozzle and ejecting it as an air jet at high-speed across a gap between the drive nozzle and an outlet flow passage or nozzle. Fluid medium in the surrounding space between the drive nozzle and outlet nozzle is entrained into the high-speed flow of compressed air
Implementation Method 2
The drive nozzle is for generating a drive jet of air from a flow of compressed air and directing the drive jet of air into a first stage expansion nozzle in order to entrain air in a volume surrounding the drive jet of air into the jet flow
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
An ejector for generating a vacuum comprises a drive nozzle (120) and a ring drive nozzle (140). The drive nozzle (120) is for generating a drive jet of air from a flow of compressed air and directing the drive jet of air into a first section expansion nozzle (130) in order to entrain air in a volume surrounding the drive jet of air into the jet flow to generate a vacuum across the first section. The ring drive nozzle (140) is for generating a drive ring of air from the flow of compressed air and directing the drive ring of air onto the jet flow and the entrained air, and into an inlet of a second section expansion nozzle (150).