Dual-Tube Ejector Nozzle for Variable Flow Rate Performance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ejector nozzles face challenges in accommodating both low-flow and high-flow rate regions, as a large nozzle size enhances high-flow rate performance but deteriorates low-flow rate performance, and a small nozzle size achieves high flow velocity in low-flow rates but struggles with high-flow rates due to limited fluid passage.
Innovation Solution
The ejector nozzle features a dual-tube structure with a first tube and a second tube of larger inner diameter, where a communication port allows fluid to flow between the two paths, enabling the size of the entire flow path to be adjusted based on flow rate by opening or closing the port, facilitated by an elastic member that operates without separate control means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the nozzle has a large size, then high-flow rate performance is improved, but low-flow rate performance deteriorates
Solution Approach 1:
The patent applies a movable partition wall that can dynamically adjust the flow path cross-sectional area based on flow rate conditions. The partition wall moves between a first position (for high-flow rate) and a second position (for low-flow rate), enabling the nozzle to adapt its geometry to maintain optimal performance across varying flow conditions.
Solution Approach 2:
The patent changes the geometric parameter of the flow path cross-sectional area by moving the partition wall between different positions. This parameter adjustment allows the nozzle to optimize its performance for different flow rate regions, transitioning from a larger effective area in high-flow mode to a smaller effective area in low-flow mode.
2Speed
If the nozzle has a small size, then flow velocity in low-flow rate section is improved, but high-flow rate performance deteriorates
Solution Approach 1:
The movable partition wall enables dynamic adjustment of the flow path geometry. In low-flow rate conditions, the partition wall is positioned to create a smaller flow path cross-sectional area, maintaining high flow velocity. In high-flow rate conditions, the partition wall moves to increase the flow path area, allowing sufficient fluid passage.
Solution Approach 2:
The patent adjusts the flow path cross-sectional area parameter based on operating conditions. By moving the partition wall, the effective flow area is reduced for low-flow applications to maintain velocity, and increased for high-flow applications to accommodate larger fluid volumes.
3Device complexity
If a single nozzle size is used, then device complexity is reduced, but adaptability to various flow rates deteriorates
Solution Approach 1:
The patent divides the single flow path into multiple segments by introducing a movable partition wall. This segmentation allows different portions of the flow path to be activated or deactivated based on flow rate requirements, enabling a single nozzle structure to perform multiple functions across different operating conditions.
Solution Approach 2:
The movable partition wall mechanism enables the single nozzle to serve multiple functions: optimizing for low-flow rate conditions by restricting the flow path area, and optimizing for high-flow rate conditions by opening up the flow path area. This multi-functionality allows one nozzle design to handle various flow rates effectively.
Data Source
AI summary
The present disclosure provides an ejector nozzle and an ejector including the same. The ejector nozzle includes a first tube having a first flow path into which a fluid is introduced, and a second tube provided outside the first tube and having an inner diameter larger than an inner diameter of the first tube, the second tube defining a second flow path between the first tube and the second tube, in which the first tube further includes a communication port that penetrates the first tube to allow the first flow path to communicate with the second flow path and is openably and closably provided, and in which when the communication port is opened, a part of the fluid flowing in the first flow path is allowed to flow along the second flow path.