Laboratory suction hood
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Solution Overview
Problem
Conventional suction hoods in chemical and biological laboratories face challenges in minimizing energy consumption while ensuring optimal protection for operators and the environment, as they typically require high airflow rates to prevent pollutant leakage.
Innovation Solution
The suction hood incorporates a vertical air curtain delivery system, which reduces the overall airflow rate by creating a barrier that separates the work space from the external environment, using fans or ventilation devices to direct air downwards or upwards, thereby minimizing the amount of polluted air entering the laboratory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high airflow rates (650-1100 m³/hr) are used in conventional suction hoods, then effective protection against pollutant leakage is ensured, but energy consumption and air conditioning costs increase significantly
Solution Approach 1:
The air flow is segmented into two functional zones: a primary air curtain flow that creates the protective barrier at the front opening, and a secondary recirculated flow that maintains positive pressure within the hood. This segmentation allows the suction fan to operate at lower speeds (200-310 m³/hr) while still achieving effective pollutant containment through the dedicated air curtain mechanism.
Solution Approach 2:
The air curtain is generated in advance before pollutants can escape the hood. By pre-establishing a downward air flow barrier at the front opening, the system proactively prevents pollutant leakage rather than relying solely on high-speed suction to react to escaping contaminants. This preliminary protective action reduces the required suction capacity.
2Object-affected harmful factors
If high airflow rates are maintained to prevent pollutant invasion, then operator safety is improved, but air conditioning costs increase by 350-800 m³/hr
Solution Approach 1:
The air curtain system serves dual functions: it creates the protective barrier against pollutants and simultaneously maintains positive pressure within the hood to prevent external air infiltration. This self-service mechanism eliminates the need for excessive make-up air, reducing air conditioning loads by 350-800 m³/hr while maintaining effective pollutant containment.
3Device complexity
If conventional suction hood design is used, then simple structure is maintained, but energy consumption is excessive
Solution Approach 1:
An air curtain is introduced as an intermediary element between the hood interior and external environment. This air flow barrier acts as a mediator that prevents direct pollutant escape and reduces the burden on the suction system, allowing operation at lower energy consumption (200-310 m³/hr) without compromising protection effectiveness.
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 design reduces energy consumption and air conditioning costs by lowering the required airflow rates from 650 to 1100 m³/hr to 200-310 m³/hr, while maintaining effective protection by creating a barrier that prevents pollutant invasion, achieving savings of 350 to 800 m³/hr of conditioned air.
Implementation Method 1
means 18 for delivering a vertical air flow, arranged at the front side 8d of the body 2 and facing downwards, so as to convey an air curtain onto the front portion 5' of the work plane 5
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
Suction hood (1), in particular of the type used in chemical and biological laboratories, comprising a body (2) which encloses a work space (3) open at a front side (8d) and comprising a work plane (5) having a front portion (5'), wherein the work space (3) is in flow communication with suction means (17) adapted to convey air, fumes and/or vapors from the work space (3) to an evacuation duct (16), wherein the suction hood (1) comprises means (18) for delivering a vertical air flow, arranged at the front side (8d) of the body (2) and facing downwards, so as to convey an air curtain onto the front portion (5') of the work plane (5).