Vacuum Ejector Nozzle Design for High Air Flow and Reduced Turbulence
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Solution Overview
Problem
Conventional vacuums face difficulties in increasing air flow rate and initial velocity of sucked objects near the suction port, leading to inefficient object collection due to turbulence caused by rapid changes in air path and direction.
Innovation Solution
A vacuum design featuring a nozzle with a turn portion and an ejection port located radially outward of the narrowest portion of the inner pipe, allowing pressurized wind to smoothly feed into the pipe and maintain direction, enhancing air flow and suction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pressurized wind is ejected to the discharge port from a position spaced from the suction port (conventional ejector design), then the structure is simple, but the air flow rate and initial velocity of sucked objects near the suction port cannot be increased
Solution Approach 1:
The nozzle is divided into multiple functional sections: a turn portion with curved surface for smooth flow transition, an inner pipe with narrowest portion for velocity control, and an ejection port positioned radially outward of the narrowest portion. This segmentation allows each section to optimize specific flow characteristics, achieving high air flow rate while maintaining manageable structural complexity.
Solution Approach 2:
The turn portion incorporates a curved surface that smoothly guides pressurized wind from the blower fan into the pipe. This curvature eliminates sharp angles and sudden direction changes, reducing turbulence and enabling higher air flow rates and initial velocities of sucked objects without proportionally increasing structural complexity.
2Speed
If the ejection port is positioned near the suction port, then the initial velocity of sucked objects increases, but turbulence occurs due to rapid changes in air path and direction
Solution Approach 1:
The turn portion uses a curved surface to gradually redirect pressurized wind into the pipe, avoiding sudden direction changes. This smooth transition maintains air flow stability while still enabling high initial velocities of sucked objects as the pressurized wind travels along the curved path to the ejection port near the suction port.
Solution Approach 2:
The inner pipe features a narrowest portion that strategically constricts the flow path to increase velocity according to fluid dynamics principles. By positioning the ejection port radially outward of this narrowest portion, the design optimizes the balance between velocity enhancement and flow stability, preventing turbulence while maintaining high initial velocities.
3Productivity
If the pressurized wind path undergoes rapid changes in direction, then the device structure is simplified, but turbulence occurs reducing suction efficiency
Solution Approach 1:
The turn portion incorporates a curved surface that smoothly guides pressurized wind into the pipe, eliminating sharp angles and sudden direction changes. This curved path configuration reduces turbulence and maintains high suction efficiency without requiring overly complex air path routing.
Solution Approach 2:
Different sections of the nozzle are designed with locally optimized characteristics: the turn portion uses curved surfaces for smooth transition, the inner pipe has a narrowest portion for velocity control, and the ejection port is positioned radially outward of the narrowest portion. This localized optimization achieves high suction efficiency while keeping the overall structure manageable.
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
The design increases air flow volume and initial velocity of sucked objects, enabling efficient object collection and switching between vacuum and blower modes with a single machine.
Implementation Method 1
a blower fan 20 provided outside the pipe 10 and driven by an electric motor... configured to feed pressurized wind generated by the blower fan into the pipe 10
Implementation Method 2
an ejector 40A provided near the suction port 10A in the longitudinal direction of the pipe 10, and configured to feed pressurized wind generated by the blower fan 20 into the pipe 10 from around the pipe 10... The pressurized wind ejected from the ejector 40A passes through the inside of the pipe 10 along the inner surface of the pipe 10
Implementation Method 3
This pressurized wind causes the pressure inside the pipe 10 to be lowered, thereby to generate suction flow (negative pressure) in the pipe 10 from the suction port 10A toward the discharge port 10B
Data Source
AI summary
Provided is a vacuum capable of increasing the air flow with a larger volume of air sucked from a suction port and increasing the initial velocity (sucking rate) of sucked objects near the suction port, and also capable of smoothly feeding pressurized wind in a pipe and efficiently sucking objects to collect the sucked objects. An ejection port is provided near the suction port by a turn portion and an inner pipe. In addition, the ejection port is provided outward of a narrowest portion of the inner pipe, the narrowest portion being provided nearer to the base end than the ejection port.