Local air cleaning apparatus
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Solution Overview
Problem
Conventional local air cleaning apparatuses have limited workability due to narrow openings, making it difficult for workers to perform tasks that require a wider clean air space, especially in precision instrument assembly and production line settings where equipment size increases, posing challenges in maintaining cleanliness.
Innovation Solution
A local air cleaning apparatus with a pair of push hoods arranged to face each other, featuring guides with air flow opening faces of the same shape, allowing for the creation of a wider clean air space by colliding uniform air flows, which are maintained at a flow rate of 0.2 to 0.7 m/s to ensure cleanliness and reduce noise and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clean bench with enclosure is used to maintain cleanliness, then air cleanliness is improved, but workability deteriorates due to narrow opening
Solution Approach 1:
The invention divides the clean air generation into multiple push hoods (typically two or more) arranged in parallel, each contributing to the overall clean air space. This segmentation allows the system to provide sufficient clean air volume while maintaining wider openings for better workability, unlike a single enclosed clean bench
Solution Approach 2:
The invention transitions from a single-point clean air outlet (in traditional clean benches) to a distributed array of push hoods with air flow opening faces. By arranging push hoods in multiple dimensions and having their air flows collide, the system creates a volumetric clean air space rather than a localized outlet, enabling wider openings while maintaining cleanliness
2Reliability
If the entire production line is arranged in the clean room to transfer manufactured articles, then cleanliness is maintained, but equipment size increases
Solution Approach 1:
The invention applies local air cleaning at specific work locations using push hoods positioned near the work area, rather than cleaning the entire production line environment. This localized approach maintains cleanliness where needed while avoiding the need to enclose or clean the entire equipment area, reducing overall equipment size
Solution Approach 2:
The push hoods act as intermediary devices that generate clean air flows to protect the work area from contamination without requiring the entire production line to be in a clean room. The clean air flows from push hoods serve as a barrier against contamination, enabling standard room environments for the rest of the equipment
3Reliability
If air flow rate is increased to maintain cleanliness in wider space, then cleanliness is improved, but power consumption and noise increase
Solution Approach 1:
The invention merges the air flows from multiple push hoods in a controlled manner, allowing the clean air flows to collide and reinforce each other. This merging effect creates a stronger clean air presence in the work space without requiring each individual push hood to operate at high flow rates, reducing overall power consumption
Solution Approach 2:
The invention uses multiple push hoods with identical or similar configurations, where each push hood replicates the clean air generation function. By distributing the cleaning function across multiple copies rather than using a single high-performance unit, the system achieves effective cleanliness while operating at lower, quieter flow rates
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 apparatus effectively forms a wider clean air space with higher cleanliness than conventional systems, reducing power consumption and noise while facilitating easier layout changes and increased work region accessibility, allowing for efficient cleaning and reduced contamination risks.
Implementation Method 1
a pair of push hoods capable of blowing out a uniform flow of cleaned air are arranged opposite to each other to cause collision of air flows from the respective air flow opening faces so as to allow a region between a pair of push hoods to be a clean air space
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A local air cleaning apparatus (1) is provided with push hoods (2, 3) having an air flow opening face (23) for blowing out a cleaned uniform air flow and a pair of guides (4, 5) provided on sides of the push hoods (2, 3) having the air flow opening faces (23), the guides (4, 5) extending from the sides thereof having the air flow opening faces (23) toward downstream sides of the uniform air flows to form opening faces (41, 51) at downstream-side end portions of the guides. The push hoods (2, 3) are arranged such that the respective air flow opening faces (23) are opposed to each other. The opening faces (41, 51) of the guides (4, 5), are spaced apart from and opposed to each other to form an open region between the opening faces (41, 51) of the respective guides (4, 5). The cleaned uniform air flows blown out from the air flow opening faces (23) collide with each other in the open region to flow out of the open region so as to allow the insides of the guides (4, 5) and the inside of the open region to have higher cleanliness than other regions.