Bolted Waterbox Hinge Assembly for Safer HVAC Cover Servicing
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Solution Overview
Problem
In HVAC systems, the removal of waterbox covers using lifting devices is hazardous and labor-intensive, as they can weigh several hundred pounds, and existing solutions require welding or removal of bolts, complicating maintenance and increasing safety risks.
Innovation Solution
A mechanically connected waterbox hinge assembly that allows for installation without welding or removing heat exchange fluids, using nuts, bolts, washers, pop rivets, and adhesives, enabling permanent attachment and adjustable alignment for easy servicing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a waterbox cover is securely attached to the HVAC unit, then reliability is improved, but ease of operation deteriorates due to the need for lifting devices and complex removal procedures
Solution Approach 1:
The hinge assembly is divided into multiple components including a hinge mount, hinge member, and hinge pin that can be separately installed and assembled. This segmentation allows the cover to be securely attached through a multi-part hinge mechanism while maintaining ease of operation by enabling simple removal through hinge pin detachment without requiring lifting devices
Solution Approach 2:
The hinge assembly provides dynamic connectivity between the waterbox cover and the HVAC unit, allowing the cover to be easily swung open and closed while maintaining secure attachment. The hinge mechanism transforms the static, difficult-to-remove cover into a dynamically accessible component that can be quickly opened for maintenance and securely closed for operation
2Strength
If welding is used to attach the hinge assembly, then strength is improved, but ease of manufacture deteriorates due to the complexity of welding procedures and heat exchange fluid removal
Solution Approach 1:
The invention replaces welding (a thermal/chemical joining process) with a mechanical hinge assembly that uses bolts, nuts, and hinge pins to attach the waterbox cover. This mechanical substitution maintains strong attachment while dramatically simplifying the installation process, eliminating the need for welding procedures and heat exchange fluid removal, and allowing installation by drilling holes and securing mechanical fasteners
3Ease of operation
If lifting devices are used to remove the waterbox cover, then ease of operation is improved, but safety deteriorates due to hazardous lifting operations
Solution Approach 1:
The hinge assembly segments the cover attachment system into removable mechanical components that can be detached without lifting the entire heavy cover. The hinge pin and mounting brackets can be removed independently, allowing the cover to be safely lowered and positioned without requiring dangerous lifting operations with heavy equipment
Solution Approach 2:
The hinge assembly acts as an intermediary mechanism between the heavy waterbox cover and the HVAC unit. This intermediate hinge structure supports the cover weight during opening and closing operations, eliminating the need for external lifting devices and thereby removing the safety hazards associated with heavy lifting while maintaining ease of operation
4Ease of operation
If bolts are removed from the waterbox cover, then ease of operation is improved, but reliability deteriorates due to potential loss or misplacement of bolts
Solution Approach 1:
The invention extracts the fastening function from the waterbox cover itself and places it in the hinge assembly structure. The hinge mount and mounting brackets are permanently attached to the HVAC unit and cover, respectively, so that only the hinge pin needs to be removed for access. This extraction eliminates the need to remove multiple bolts from the cover, improving ease of operation while maintaining reassembly integrity through the simplified single-point detachment mechanism
Data Source
AI summary
Embodiments described in this specification are generally directed to a bolted hinge assembly for a waterbox cover (a “waterbox hinge assembly”). The waterbox hinge assembly generally does not require welding on the waterbox cover or the heat exchanger in an HVAC system (“HVAC unit” hereinafter). Further, the waterbox hinge assembly may be installable to the HVAC unit without removing the heat exchange fluids (e.g., water, refrigerant, etc.) from the HVAC unit. In some embodiments, the waterbox hinge assembly can be installed on an HVAC unit without removing any bolts from the waterbox cover. Once installed, the waterbox hinge assembly can be left in place so that it can be reused anytime the HVAC unit is serviced.