Frameless hinged access door system
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Solution Overview
Problem
In the HVAC duct system, access openings often lead to air leaks due to improper mounting and sealing, resulting in efficiency losses and increased operating costs, and condensation issues from temperature differences, which can cause water damage and mold problems. Additionally, retrofitting existing ducts with access doors is challenging.
Innovation Solution
A frameless access door system with a hingedly mountable design, equipped with a cam latch and insulation, uses a resilient sealing material to ensure a uniform compressive force for sealing and is designed for easy installation and retrofitting, including a second member with sidewalls and insulation to guide positioning and prevent condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional framed access door is used, then the access opening can be sealed, but the device complexity increases and installation becomes more difficult
Solution Approach 1:
The patent removes the traditional frame structure from the access door assembly, extracting only the essential sealing and access functions. The resilient sealing material is applied directly to the door perimeter, eliminating the need for a separate frame while maintaining sealing effectiveness and reducing device complexity.
Solution Approach 2:
The patent combines the sealing function with the door structure itself by applying resilient sealing material directly to the door perimeter. This merges the door and sealing elements into a single integrated component, eliminating the separate frame and reducing overall device complexity while maintaining reliable sealing.
2Loss of energy
If proper sealing is applied to prevent air leaks, then HVAC efficiency improves, but the ease of manufacture and installation decreases
Solution Approach 1:
The patent uses resilient sealing material that changes its physical parameters under compression. The material is designed to deform and conform to irregular surfaces when compressed by the cam latch mechanism, creating an effective seal without requiring precise manufacturing tolerances or complex installation procedures.
Solution Approach 2:
The resilient sealing material performs self-adjustment during installation and operation. It automatically conforms to the duct surface irregularities through compression, eliminating the need for precise manual adjustment or complex alignment procedures during installation while maintaining effective sealing.
3Object-affected harmful factors
If insulation is added to prevent condensation, then water damage and mold problems are prevented, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent uses a thin layer of resilient sealing material that provides both sealing and insulation functions. This flexible membrane approach prevents condensation by creating a thermal barrier without requiring thick rigid insulation layers, maintaining simplicity in both structure and installation.
Solution Approach 2:
The patent combines the sealing function with the insulation function in a single integrated component. The resilient sealing material serves dual purposes: preventing air leaks and providing thermal insulation to prevent condensation, thereby eliminating the need for separate insulation layers and reducing overall device complexity.
4Ease of operation
If a frameless design is used, then ease of installation and retrofitting improves, but the reliability of sealing may worsen
Solution Approach 1:
The patent employs resilient sealing material that changes its physical state under compression. The material transitions from a flexible, conformable state during installation to a compressed, seal-tight state when the cam latch is engaged, ensuring reliable sealing without requiring a rigid frame structure.
Solution Approach 2:
The resilient sealing material acts as an intermediary between the door and the duct surface. It compensates for surface irregularities and gaps that would otherwise prevent effective sealing in a frameless design, mediating the contact between the door perimeter and the duct opening to ensure reliable sealing.
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 frameless access door effectively seals air leaks, reduces condensation, and is cost-effective and easy to install, addressing the inefficiencies and damage issues associated with traditional access doors while allowing for seamless retrofitting onto existing ducts.
Implementation Method 1
The flange is equipped with a resilient sealing material such as an elastic foam material. The flange sealing material is cooperatively engageable with the access opening when the cam latch engages a recess in the frame and distributes a uniform compressive sealing force along said flange when said first member is in a closed position relative to said opening.
Data Source
AI summary
A frameless HVAC door system for reduced noise transmission leakage, and improved installation. The system includes a first member having opposed first and second surfaces and a first size that defines a first perimeter extending around the first and second surfaces. The first member is further equipped with a latch spaced apart from a hinge member on the first member. The door further includes a second member mounted on the first member first surface. The second member includes a sidewall extending around the second member to define a second member perimeter. The second member further includes a second member surface extending between the side walls and along the second member perimeter to define a compartment. The compartment is insulated against noise and temperature change. The second member perimeter is smaller than the first member perimeter, which defines a flange extending from the second member perimeter to the first member perimeter to define a flange perimeter. The flange is equipped with a resilient elastic foam sealing material along its perimeter. The first member is hingedly mounted to a surface around an opening for pivotal movement relative thereto. When the latch engages the latch receiver, it distributes a uniform compressive sealing force along the flange when the first member is in a closed position relative to the opening.