Precharged HVAC Line Set With Self-Sealing Connectors
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Solution Overview
Problem
The installation of mini split HVAC systems is cumbersome due to the need for precise torque handling of refrigerant line connections, potential leaks, and the requirement for specialized tools and expertise, making it challenging for both novice and professional installers.
Innovation Solution
A partially-assembled HVAC system is provided, where the refrigerant lines are precharged and connected at a pre-installation location, using self-sealing connectors that can be hand-tightened, eliminating the need for specialized tools and reducing the risk of leaks during installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional refrigerant line connection methods are used, then reliable refrigerant sealing is achieved, but installation complexity and tool requirements increase
Solution Approach 1:
The refrigerant lines are pre-charged with refrigerant at the manufacturing location before shipping. The quick-connect fittings are pre-assembled and sealed. This preliminary preparation eliminates the need for installers to perform complex vacuuming, charging, and leak testing operations, while maintaining reliable refrigerant sealing through factory-controlled processes.
Solution Approach 2:
Quick-connect fittings serve as intermediary components between the refrigerant lines and HVAC units. These fittings include built-in seals and O-rings that facilitate easy connection and disconnection while maintaining refrigerant containment. The intermediary connector design allows tool-free installation while ensuring reliable sealing through integrated seal elements.
2Loss of time
If precharged refrigerant lines are used, then installation time is reduced, but risk of leakage during shipping increases
Solution Approach 1:
The quick-connect fittings are designed with pre-installed seals and O-rings that are compressed during shipping to maintain refrigerant containment. The fittings include backup seal elements and pressure-equalization features that cushion against potential leakage risks during transit. This beforehand preparation ensures that even if the system is moved or subjected to vibration, refrigerant leakage is prevented.
3Ease of manufacture
If manual wire stripping and connector attachment is required, then electrical connections can be made, but installation labor and time increase
Solution Approach 1:
Electrical wires are pre-striped, pre-attached to connectors, and pre-assembled into harnesses at the manufacturing location. The wire connectors are pre-crimped and sealed. This preliminary preparation eliminates the need for installers to perform time-consuming wire stripping, bending, and connector attachment operations, while ensuring proper electrical connections through factory-controlled assembly processes.
4Manufacturing precision
If specialized tools are required for installation, then connection precision is improved, but accessibility and ease of installation decrease
Solution Approach 1:
Quick-connect fittings with integrated seals and O-rings serve as intermediary components that enable tool-free connection while maintaining precise sealing. The fittings are designed with alignment features and cam-actuated locking mechanisms that ensure proper engagement without requiring torque wrenches or specialized tools. This intermediary design bridges the gap between connection precision and ease of operation.
Data Source
AI summary
An HVAC includes a first HVAC unit, a second HVAC unit, and a refrigerant line set. The refrigerant line set includes a high-pressure refrigerant line and a low-pressure refrigerant line. The refrigerant lines may be connected to one or both of the first and second HVAC units at a pre-installation location such that all components are precharged at the pre-installation location. The refrigerant lines may be disconnected from one of the first and second HVAC units and shipped to an installation location. The first high pressure line end and the first low pressure line end may be then coupled to the one of the first and second HVAC units by a user at an installation location.