Ventilation cabinet for a smoke-removal installation comprising an adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Smoke extraction installations in buildings often deviate from calculated airflow standards due to unforeseen obstacles and tightness issues, leading to potential safety risks and operational challenges, such as excessive pressure or insufficient flow rates, which require time-consuming modifications to the ventilation circuit.
Innovation Solution
A ventilation box with a movable adjustment shutter that can be adjusted continuously during operation to precisely match the required airflow rate without special tools or equipment, allowing for quick and efficient adjustments to ensure compliance with standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the airflow rate is increased to meet safety standards with leakage allowances, then smoke extraction safety is improved, but excessive pressure exceeds 80Pa preventing door opening
Solution Approach 1:
The patent applies the dynamics principle by making the air inlet passage adjustable through a movable shutter or adjustable grille. This allows the system to dynamically adapt the airflow rate after installation, enabling operators to reduce airflow and pressure when the initially calculated high flow rate (with 20% leakage allowance) proves excessive in practice. The adjustable mechanism transforms a static system into a dynamic one that can respond to actual operating conditions.
2Ease of operation
If the airflow rate is reduced to prevent excessive pressure, then door opening capability is improved, but smoke extraction safety may be compromised
Solution Approach 1:
The adjustable air inlet passage enables dynamic balancing between safety and operational requirements. The system can be set to high airflow for safety during smoke extraction events, then adjusted to lower airflow during normal operation to maintain door opening capability. This dynamic adjustability resolves the contradiction by allowing the system to operate at different points on the safety-operational performance curve.
Solution Approach 2:
The patent changes the physical parameter of airflow rate by providing an adjustable air inlet passage. This allows the operator to modify the cross-sectional area of the air inlet, thereby changing the airflow rate and corresponding pressure levels. By adjusting this parameter, the system can transition between safety-oriented high-flow mode and operation-oriented low-flow mode.
3Manufacturing precision
If the ventilation circuit is modified to adjust airflow rate, then airflow precision is improved, but installation time and complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-equipping the ventilation system with an adjustable air inlet passage during manufacturing. This adjustment mechanism is installed and ready for use before the system is commissioned, eliminating the need for complex retrofits or modifications after installation. The preliminary inclusion of the adjustment mechanism saves significant time and reduces complexity compared to post-installation modifications.
Solution Approach 2:
By incorporating a simple adjustable shutter or grille at the air inlet, the system achieves airflow precision through a low-complexity dynamic adjustment mechanism rather than complex circuit modifications. This approach allows quick adjustment of airflow rates without requiring extensive changes to the ventilation ductwork or fan system.
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
Enables rapid and precise adjustment of airflow rates during smoke extraction or fresh air intake, ensuring safety compliance and preventing operational issues like excessive pressure or insufficient flow, thereby facilitating quicker system approvals and reducing the need for extensive modifications.
Implementation Method 1
the passage section of the inlet of air from the air collection compartment can be continuously adjusted by moving the movable adjustment shutter
Data Source
Figure 1~3
AI summary
The subject of the invention is a ventilation box for a smoke extraction installation of a building, comprising a collection compartment (4) for air extracted from the building or for outside air having an air inlet (6), and compartments (8, 14) containing a turbine (10) as well as a motorization (16) driving this turbine (10), characterized in that the air inlet (6) of the collection compartment (4) comprises a mobile flap (20) for adjusting its air passage section.