Silenced Blowing Nozzle with Divergent Secondary Streams
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Solution Overview
Problem
Existing silenced blowing nozzles fail to achieve sufficient blowing force with low noise levels and high precision, particularly in applications like the pulp and paper industry, where high air flows generate excessive noise and require immediate operator action without the luxury of hearing protection.
Innovation Solution
A silenced blowing nozzle design featuring a central Laval nozzle with divergent secondary nozzles arranged around a circle, optimized for a 1.5° to 8° angle relative to the core stream axis, which enhances the concentration and precision of the core stream, reduces turbulence, and lowers energy consumption, thereby increasing blowing force and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high air flow is used to increase blowing force, then blowing force is improved, but noise level increases
Solution Approach 1:
The blowing nozzle is segmented into a central part with primary discharge openings for the core stream and a peripheral part with secondary discharge openings for peripheral gas streams. This segmentation allows the high-velocity core stream to maintain blowing force while the peripheral streams reduce turbulence and noise by filling in the expansion zone.
Solution Approach 2:
The peripheral gas streams act as an intermediary between the high-velocity core stream and the surrounding environment. These intermediate streams reduce the abrupt expansion of the core stream, thereby reducing turbulence and noise generation while maintaining the blowing force of the core stream.
2Force
If high air flow is used to increase blowing force, then blowing force is improved, but energy consumption increases
Solution Approach 1:
The invention converts the harmful turbulence and energy waste from the expanding air stream into beneficial peripheral gas streams. The peripheral nozzles utilize the expansion energy to generate controlled peripheral streams that reduce turbulence, thereby converting energy that would be wasted into useful flow structure that maintains blowing force with lower overall energy consumption.
3Object-generated harmful factors
If peripheral gas streams are used to reduce noise, then noise level is reduced, but core stream concentration decreases
Solution Approach 1:
The peripheral nozzles are strategically positioned and angled to discharge gas streams in specific directions that fill the expansion zone without interfering with the central core stream. This local quality approach ensures that noise reduction occurs in the peripheral regions while the central core stream maintains its concentration and directionality.
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 achieves a more concentrated core stream with lower energy consumption and noise levels, resulting in higher efficiency and compliance with safety regulations by minimizing sound generation and maintaining a low turbulence environment.
Implementation Method 1
a primary nozzle means (3) which comprises at least one Laval nozzle (4) and has at least one primary discharge opening (5) through which the discharge opening(s) will generate a core stream with a supersonic velocity
Implementation Method 2
The invented blowing nozzle also decreases the turbulence, which means a lower noise level
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to a silenced blowing nozzle for blowing of a gas medium under overpressure, in particular air. The blowing nozzle includes a central part (11) with a primary nozzle means (13) which includes at least one Laval nozzle (14) and has at least one primary discharge opening (15) such that the primary discharge opening (s) (15) will generate a core stream of gas with supersonic velocity. The central part (11) is surrounded by a more peripheral part (12) containing a plurality of secondary nozzles (16a, 16b, 16c) with respective secondary discharge openings (17a, 17b, 17c). These are spaced from another and from said primary discharge opening(s) (15). According to the invention each secondary discharge opening (17a, 17b, 17c) is arranged to generate a gas stream that is divergent from the axis of the core stream.