Self-Cleaning Shut-Off Flap for Tar-Resistant Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In exhaust gas purification devices, particularly in the coal-graphite industry, shut-off flaps become sticky and leaky due to tar deposits, making them difficult to open and leading to inefficient operation.
Innovation Solution
The shut-off flap is designed with a pivotably attached damper leaf that moves parallel to the sealing surface upon closure, scraping off deposits and reducing sticking, and incorporates a swivel arm joint system with a restoring element for effortless opening, ensuring the flap cleans itself with each closure and reduces operational effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shut-off flap uses a conventional sealing mechanism, then the sealing surface initially provides good sealing, but tar deposits build up over time causing the valve to become leaky and difficult to open
Solution Approach 1:
The patent applies preliminary action by designing the damper leaf to automatically scrape the sealing surface during the closing operation itself. The scraping action occurs before the valve is fully closed, preemptively removing tar deposits that would otherwise accumulate and cause sticking or leaking during subsequent operations
Solution Approach 2:
The system performs self-service through the self-cleaning mechanism where the damper leaf autonomously removes tar deposits from the sealing surface during normal operation. The scraping action is integrated into the valve's closing motion, allowing the system to clean itself without external intervention, thereby maintaining sealing performance and reducing operational effort
2Device complexity
If the damper leaf is rigidly attached to the pivot arm, then the structure is simple, but the valve becomes sticky and difficult to open due to tar buildup on the sealing surface
Solution Approach 1:
The patent applies dynamics by replacing the rigid attachment with a movable connection that allows the damper leaf to shift parallel to the sealing surface during closing. This dynamic adjustment enables the leaf to scrape deposits while maintaining proper sealing contact, preventing sticking and ensuring smooth operation without requiring complex additional mechanisms
3Ease of operation
If the pivot arm is designed with multiple swivel joints and a restoring element, then the valve opens effortlessly and self-cleaning occurs, but the device complexity increases
Solution Approach 1:
The restoring element acts as a counterweight mechanism that automatically returns the pivot arm to its initial position after closing. This counterbalancing force compensates for the weight and friction of the damper leaf assembly, enabling effortless opening without requiring significant external force while maintaining a relatively simple overall structure
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 solution effectively prevents leaks and reduces the effort required to open the flap by self-cleaning the sealing surfaces, maintaining the flap's tightness and operational efficiency over time.
Implementation Method 1
the flap leaf for closing the valve opening initially has a movement towards the sealing surface and, when touching the sealing surface, execute a movement parallel to the sealing surface... scraping off any unevenness between the sealing surface and the damper leaf
Implementation Method 2
the swivel arm joint can have a restoring element which is tensioned in a closed position of the swivel arm parts corresponding to the closed shut-off shutter and which moves the outer swivel arm part when the shut-off shutter is opened
Data Source
Figure 1~2
Figure 3~4
AI summary
Described is a shut-off flap (10), in particular for use in a device for exhaust-gas purification, in particular for the regenerative post-combustion of tar and/or carbon and/or graphite particles in waste air, having a flap blade (18) which, in order to close off a valve opening (12), bears against a sealing face (16) there. The flap blade (18) is pivotably fastened by means of at least one movable connection (22, 32) to a free end of a pivot arm (24), and the pivot arm (24) is fastened by means of a base pivot joint (26) so as to be pivotable relative to the sealing face (16), in such a way that the flap blade (18), in order to close the valve opening (12), firstly performs a movement toward the sealing face (16) and, when it comes to bear against the sealing face (16), a movement parallel to the sealing face (16).