Fire damper with a housing having at least one housing wall and with a flap leaf mounted in such a manner that it can be pivoted about an axis of rotation between an open position and a closed position

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Solution Overview

Problem

Existing fire protection flaps in contaminated air environments, such as kitchen or laboratory exhausts, require regular and complex cleaning to prevent deposits and debris from accumulating on the flap's front surface, which can impair function and stability.

Innovation Solution

The design incorporates two protective devices inside the housing that shield the flap's end faces in the open position, forming a cavity sealed by cold seals, which protects the front surface from airflow and contamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the damper blade is exposed to airflow without protection, then the flow cross-section is maximized, but deposits accumulate on the damper blade surface requiring regular cleaning

Engineering Contradiction:

Improveflow cross-sectionVSAvoiddeposits on damper blade

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The housing internal cross-section is divided into a flow channel for airflow and a protective device region for shielding the damper blade. This segmentation allows the airflow to pass through one section while the damper blade remains protected in another section, resolving the contradiction between maximizing flow and preventing deposits.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The protective device acts as an intermediary element between the airflow and the damper blade. It shields the damper blade from direct exposure to contaminated airflow, preventing deposit accumulation while allowing the system to maintain its flow cross-section.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the damper blade is shielded from airflow, then deposits are prevented, but the flow cross-section is reduced

Engineering Contradiction:

Improvedeposits on damper bladeVSAvoidflow cross-section

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The protective device provides complete shielding of the damper blade end face, which is more than the minimum required to prevent deposits. This excessive protection is acceptable because the segmented design ensures it does not significantly impact the overall flow cross-section.

Inventive Principle:

Principle #16Partial or excessive action

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 solution effectively shields the flap's front surface from contamination, reducing the need for regular cleaning and ensuring the fire protection flap remains functional and stable in contaminated air environments.

Implementation Method 1

each of which forms a cavity with the end face assigned to it that is sealed off from the interior of the housing by at least one cold seal

Methodology Applied

Scientific EffectCold seal:

Data Source

PatentEP4186566B1Fire damper with a housing having at least one housing wall and with a flap leaf mounted in such a manner that it can be pivoted about an axis of rotation between an open position and a closed position

Publication Date: 2025.05.14 TROX SE

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AI summary

The invention relates to a fire damper with a housing having a housing wall (1) and with a damper blade (3), preferably mounted pivotably about an axis of rotation (2) and having two opposing damper surfaces (5, 6) connected to each other by a circumferential end face (4) and preferably made of calcium silicate, the damper blade (3) being preferably mounted centrally on the housing cross-section and pivotable about an axis of rotation (2), wherein the axis of rotation (2) divides the damper blade (3) into two damper blade halves, wherein two opposing bearing points forming the axis of rotation (2) are provided for mounting the damper blade (3), and wherein the damper blade (3) is pivotable from its closed position to its open position, which is aligned parallel to the flow direction (11), against the restoring force of a spring element.To provide a fire damper that can be used in contaminated airflows, such as kitchen or laboratory exhaust ducts, without regular and costly cleaning of the damper blade's end face, two protective devices (8) are provided inside the housing to shield the end faces (4) in the open position of the damper blade (3). These protective devices extend along the respective end face (4) in the open position of the damper blade (3), with each protective device (8) and its associated end face (4) forming a cavity (10) sealed against the interior of the housing by at least one cold seal (9), so that each of the two end faces (4) is completely shielded by its associated protective device (8) in the open position of the damper blade (3).