Refrigerant Compressor Fluid Diode for Lubricant Return Without Valves
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Solution Overview
Problem
Existing compressors face issues with lubricant return from high-pressure to low-pressure regions, leading to fluidic short-circuits, power loss, high wear, and clogging risks due to the use of multiple moving components and complex valve arrangements.
Innovation Solution
Incorporating a fluid diode in the lubricant return channel, which eliminates the need for moving components and adjustable valves, allowing only lubricant to pass through with minimal fluid flow, reducing clogging risks through an open geometry and differential flow resistance based on fluid properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve arrangement with multiple moving components is used for lubricant return, then the lubricant can be returned from high-pressure to low-pressure region, but wear increases and reliability decreases
Solution Approach 1:
The patent replaces the mechanical valve arrangement with moving components with a purely geometric fluid diode structure. The fluid diode uses asymmetric channel geometry (narrower inlet, wider outlet) to create directional flow resistance based on fluid dynamics principles, eliminating all moving parts and associated wear while maintaining the lubricant return function.
Solution Approach 2:
The patent applies fluid dynamic principles to create a passive directional control mechanism. The fluid diode utilizes pressure differential and geometric constraints to allow lubricant flow from high-pressure to low-pressure region while blocking reverse flow, replacing mechanical actuation with hydraulic/pneumatic field-based control.
2Ease of operation
If an adjustable valve arrangement is used for lubricant return, then flow control is possible, but device complexity and adjustment requirements increase
Solution Approach 1:
The fluid diode automatically regulates flow based on the inherent pressure differential between high-pressure and low-pressure regions. The asymmetric geometry self-adjusts to the operating conditions, allowing lubricant return when needed while blocking reverse flow, eliminating the need for external control systems or manual adjustments.
Solution Approach 2:
The patent extracts the essential function of flow directionality from the complex valve arrangement and embodies it in a simple geometric structure. By removing all adjustable components and control mechanisms, the solution achieves flow control through pure geometric design, significantly reducing device complexity.
3Reliability
If a conventional lubricant return channel is used, then lubricant can circulate, but clogging risks increase due to particles
Solution Approach 1:
Instead of trying to filter particles out of the lubricant, the patent inverts the approach by designing a channel geometry that is inherently resistant to particle accumulation. The asymmetric fluid diode structure with its expanding cross-section promotes smooth flow and prevents particle deposition, making the system self-cleaning in effect.
4Loss of energy
If a valve arrangement is used for lubricant return, then flow control is achieved, but pressure loss increases and power loss occurs
Solution Approach 1:
The patent replaces the energy-consuming mechanical valve system with a passive geometric structure that directs flow without moving parts. The fluid diode creates minimal pressure loss by using smooth geometric transitions rather than sharp valve edges, reducing turbulence and energy dissipation while maintaining flow control.
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 solution reduces wear, eliminates the need for adjustments, and minimizes clogging, ensuring efficient lubricant return with reduced fluid flow from high to low-pressure regions, enhancing compressor performance and reliability.
Implementation Method 1
differential flow resistance based on fluid properties
Implementation Method 2
Incorporating a fluid diode in the lubricant return channel
Data Source
AI summary
The present disclosure relates to a compressor having a low-pressure region and a high-pressure region, wherein a lubricant is provided in the low-pressure region in order to lubricate the compressor. A fluid is conveyed from the low-pressure region into the high-pressure region and compressed, wherein a portion of the lubricant with the fluid from the low-pressure region reaches the high-pressure region, and wherein a lubricant separator for separating the lubricant from the fluid/lubricant mixture in the high-pressure region is provided. A lubricant return channel for transporting the separated lubricant from the high-pressure region into the low-pressure region is provided.