Four-Way Valve Wall Portion Design to Reduce Refrigerant Leakage
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Solution Overview
Problem
Conventional four-way valves in refrigeration cycle apparatuses experience refrigerant leakage from the high-pressure side to the low-pressure side due to gaps between the flow channel switching piston and the installation surface.
Innovation Solution
A refrigeration cycle apparatus design where a wall portion slides along the inner surface with the flow channel switching piston, creating a space between them to cover the piston and maintain an intermediate pressure, reducing refrigerant leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flow channel switching piston is used to switch flow channels in a four-way valve, then the valve can effectively direct refrigerant flow between high-pressure and low-pressure sides, but gaps between the piston and installation surface cause refrigerant leakage from high-pressure to low-pressure side
Solution Approach 1:
A wall portion is introduced as an intermediary element between the high-pressure side and low-pressure side. This wall portion moves together with the flow channel switching piston and maintains a space between itself and the piston, creating an intermediate pressure zone that prevents direct high-pressure refrigerant from leaking to the low-pressure side through the gap.
Solution Approach 2:
The valve interior is segmented into distinct pressure zones by the wall portion. The space between the wall portion and the flow channel switching piston creates a separate intermediate pressure chamber, dividing the original direct path from high-pressure to low-pressure side into multiple staged pressure transitions.
2Device complexity
If the flow channel switching piston slides directly along the installation surface, then the structure remains simple, but refrigerant leaks through the gap between the piston and installation surface
Solution Approach 1:
The wall portion serves as a mediator that moves with the piston while maintaining a controlled space between itself and the piston. This intermediate structure prevents refrigerant leakage without requiring complex sealing mechanisms, preserving structural simplicity while improving reliability.
3Loss of substance
If a wall portion is added to cover the flow channel switching piston and create an intermediate pressure space, then refrigerant leakage is reduced, but the device complexity increases
Solution Approach 1:
The wall portion is designed as a relatively simple intermediary structure that moves together with the existing flow channel switching piston. It creates the necessary intermediate pressure space without requiring complex mechanisms, achieving refrigerant leakage reduction with minimal increase in structural complexity.
Solution Approach 2:
The wall portion is integrated with the flow channel switching piston assembly, moving together with it as a coordinated unit. This merging approach allows the new element to function effectively while maintaining a compact and unified valve structure.
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
This configuration significantly reduces refrigerant leakage from the high-pressure side to the low-pressure side, enhancing heat exchange performance and insulation by maintaining an intermediate pressure between the high and low-pressure sides.
Implementation Method 1
The pressure of the refrigerant can thus be an intermediate pressure between a high-pressure side and a low-pressure side in the space between the wall portion and the flow channel switching piston
Data Source
AI summary
A refrigeration cycle apparatus includes a compressor, a four-way valve, a first outdoor heat exchanger, a first expansion valve, and an indoor heat exchanger. The four-way valve includes a casing, a first flow channel, a second flow channel, a flow channel switching piston, and a wall portion. The flow channel switching piston is configured to slide along an inner surface to switch between passing the refrigerant through the first flow channel and passing the refrigerant through the second flow channel. The wall portion is configured to slide along the inner surface together with the flow channel switching piston and is disposed with a space between the flow channel switching piston and wall portion to cover the flow channel switching piston.