Multifunctional Sleeve Assembly for Premix Cell Maintenance Access
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Solution Overview
Problem
Current premix heat exchange cells are cumbersome and unsafe to maintain due to the need to disconnect and reconnect heavy and delicate gas and electrical connections, and they often suffer from fume reflux issues during parallel or cascade connections, requiring complex and costly maintenance operations.
Innovation Solution
A multifunctional sleeve that allows for easy access and maintenance of premix heat exchange cells by separating from the casing without disconnecting the premixer, accommodating different premixers and check valves, and preventing fume reflux through a universal design that reduces the need for clamping tools and specialized skills.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the premixer is directly connected to the feeding duct without interposed elements, then the structure is simplified, but the maintenance becomes cumbersome and unsafe due to the need to disconnect heavy and delicate gas and electrical connections
Solution Approach 1:
The patent introduces a removable coupling device that segments the connection between the premixer and feeding duct. This coupling device can be detached independently, allowing maintenance personnel to access the combustion chamber without disconnecting the entire premixer assembly, thereby simplifying maintenance operations while maintaining structural integrity during normal operation
Solution Approach 2:
The removable coupling device acts as an intermediary element between the premixer and feeding duct. It provides a standardized interface that simplifies the connection structure while enabling easy detachment for maintenance, thus resolving the contradiction between structural simplicity and maintenance ease
2Ease of repair
If the premixer is separated from the mixture feeding duct, then maintenance becomes easier, but the premixer remains coupled to the gas tube and electrical connections, applying its weight and increasing safety risks
Solution Approach 1:
The coupling device is designed to separate the premixer from all connections (feeding duct, gas tube, and electrical connections) simultaneously. This complete segmentation eliminates the safety risk of the premixer hanging from gas and electrical connections while maintaining ease of maintenance through the removable coupling interface
3Ease of operation
If the door-duct-premixer unit is removed for maintenance, then access to the combustion chamber is achieved, but the heavy and cumbersome unit requires increased labor and time
Solution Approach 1:
The coupling device enables segmentation of the premixer assembly from the door and feeding duct. Maintenance personnel can now remove only the necessary components (door or coupling device) rather than the entire heavy assembly, significantly improving maintenance efficiency and reducing labor requirements
Solution Approach 2:
The removable coupling device allows extraction of the premixer or feeding duct connection independently from the door assembly. This extraction principle enables targeted maintenance operations without moving the entire door-duct-premixer unit, thereby improving productivity
4Reliability
If non-return systems are installed to prevent fume reflux, then safety is improved, but the system complexity and cost increase
Solution Approach 1:
The coupling device is designed with universal applicability to different premixer models and feeding duct configurations. This multi-functionality allows a single standardized coupling design to prevent fume reflux across various system configurations without requiring complex, customized non-return systems for each setup
Data Source
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AI summary
A multifunctional sleeve (5) for a premix heat exchange cell (1), said cell (1) comprising a casing (10) adapted to contain a liquid/gas heat exchanger (14) and a combustion space (15) adjacent to the exchanger (14); a door (20) adapted to be removably fastened to the casing (10) for closing the casing, in use, and adapted to be removed from the casing (10) to allow access inside the casing (10) for maintenance operations; said door (20) comprising a mixture feeding duct (21) having a first duct end (21') fastened to the door (20) and ending up, in use, inside the casing (10) at the combustion space (15) through a door through opening (23), and a free second duct end (21") adapted to receive an incoming fuel gas/combustion air mixture from a premixer (3), said multifunctional sleeve (5) comprising a tubular portion (51); a first fluid connection portion (52) at a first tubular portion end (53) adapted to be removably fastened to the duct end (21 "); a second fluid connection portion (54) at a second tubular portion end (55), opposite to the first end, adapted to be removably fastened to a premixer outlet (31); a fastening device (61) adapted to removably fasten the multifunctional sleeve (5) to the casing (10), outside the casing (10).