Flushing Unit Pressure Relief for Vapor Compression Systems
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Solution Overview
Problem
Existing flushing systems for vapor compression systems, such as HVAC and refrigeration, face safety concerns due to the risk of over-pressurization of the cylinder containing flushing agents, which can lead to explosions, and compatibility issues during refrigerant conversions that result in reduced efficiency and potential compressor failure.
Innovation Solution
A flushing unit with a pressure relief member that automatically actuates to relieve excess pressure, using a driving fluid like inert gas to displace the flushing agent into the system, ensuring the reservoir is not over-pressurized, and incorporating a valve system to manage pressure safely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a closed flushing system is used to maintain pressure, then flushing effectiveness is improved, but safety deteriorates due to risk of over-pressurization and explosion
Solution Approach 1:
The pressure relief valve extracts the excess pressure from the closed flushing system by providing a controlled release path. When pressure exceeds the predetermined threshold, the valve opens to vent pressure, preventing over-pressurization and explosion while maintaining system safety during normal operation.
Solution Approach 2:
The pressure relief valve acts as an intermediary safety mechanism between the pressurized flushing system and the environment. It mediates the pressure control function by automatically opening at predetermined pressure levels to relieve excess pressure, thus protecting the system from catastrophic failure.
2Adaptability or versatility
If mineral oil is used in R-22 systems, then compatibility with HCFC refrigerant is improved, but compatibility with HFC refrigerant deteriorates causing efficiency reduction and compressor failure
Solution Approach 1:
The invention changes the oil parameter from mineral oil to synthetic oil compatible with HFC refrigerants. This parameter change ensures compatibility with both HCFC and HFC refrigerant types, preventing the affinity issues with mineral oil and HFC refrigerants that cause efficiency reduction and compressor failure during refrigerant conversions.
Solution Approach 2:
The invention uses synthetic oil as a composite lubricant that maintains compatibility across different refrigerant types. This composite approach replaces the single-type mineral oil with a synthetic formulation that does not exhibit the affinity problems with HFC refrigerants, ensuring reliable compressor operation during refrigerant transitions.
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 ensures safe operation by preventing over-pressurization and maintaining system compatibility during refrigerant conversions, thereby enhancing safety and efficiency by effectively removing contaminants and ensuring proper lubrication in vapor compression systems.
Implementation Method 1
In the event the pressure in the reservoir exceeds a predetermined level, a pressure relief valve in the flushing unit is automatically actuated, thereby relieving pressure in the otherwise closed system.
Implementation Method 2
the valve, when opened, causes the driving fluid to flow into the reservoir containing the flushing agent and displace the flushing agent from the reservoir
Data Source
AI summary
A flushing unit for flushing vapor compressions systems with a flushing agent. The flushing unit includes a pressure relief member to ensure that the reservoir containing the flushing agent is not over-pressurized. In certain embodiments, the flushing unit is adapted to be in communication with a driving fluid or propellant, such as an inert gas or a flushing gas, and with a source of a flushing agent, such as a reservoir. The flushing unit includes a valve that, when opened, causes the driving fluid to flow into the reservoir containing the flushing agent and displace the flushing agent from the reservoir, causing it to ultimately flow into the system being flushed such as via a suitable hand-held injector. In the event the pressure in the reservoir exceeds a predetermined level, a pressure relief valve in the flushing unit is automatically actuated, thereby relieving pressure in the otherwise closed system.