Fuel Cell Compressor Depressurization Pipe Design
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Solution Overview
Problem
In fuel cell systems, oil leakage from the compressor's closed space into the compression chamber can occur due to pressure increases caused by heat generation, leading to oil mixing with the air supplied to the fuel cell, which can cause operational issues.
Innovation Solution
A fuel cell system design that includes a depressurization pipe with a first end connected to the compressor's oil reservoir and a second end open to the atmosphere, arranged to intersect with the cooling medium piping, which helps to cool and condense vaporized oil, preventing oil leakage into the compression chamber and maintaining efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the compressor operates in a closed space with motor and driving portions, then the compressor can effectively compress and supply air to the fuel cell, but heat generation causes pressure increase leading to oil leakage into the compression chamber
Solution Approach 1:
The compressor is divided into separate functional chambers: a compression chamber for air compression and a drive chamber for the motor and driving mechanism. This segmentation isolates the oil-containing drive chamber from the compression chamber, preventing oil leakage into the air supply path while maintaining compression efficiency.
Solution Approach 2:
A depressurization pipe acts as an intermediary component, connecting the drive chamber to the atmosphere. This pipe provides a controlled pressure relief path that prevents pressure buildup in the drive chamber, thereby eliminating the pressure differential that would otherwise force oil into the compression chamber.
2Reliability
If a depressurization pipe is added to prevent pressure increase and oil leakage, then oil leakage is reduced, but the system complexity increases
Solution Approach 1:
The depressurization function is extracted as a separate, simple component (the depressurization pipe) rather than integrating it into the main compressor mechanism. This minimalistic approach adds only the essential element needed for pressure relief without complicating the overall system architecture.
3Reliability
If the drive chamber is separated from the compression chamber, then oil leakage is prevented, but the device complexity increases
Solution Approach 1:
The compressor is divided into separate functional chambers: a compression chamber for air compression and a drive chamber for the motor and driving mechanism. This segmentation isolates the oil-containing drive chamber from the compression chamber, preventing oil leakage into the air supply path while maintaining compression efficiency.
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 depressurization pipe effectively suppresses internal pressure increases in the compressor, reducing oil leakage and ensuring that the air supplied to the fuel cell remains free from contaminants, thus enhancing the system's reliability and performance.
Implementation Method 1
arranged to intersect with the cooling medium piping, which helps to cool and condense vaporized oil
Implementation Method 2
a depressurization pipe including a first end portion, a second end portion, and a rising portion that is extended vertically upward, the depressurization pipe being configured such that the first end portion is connected with the compressor and that the second end portion is open to the atmosphere
Data Source
AI summary
A compressor included in a fuel cell system comprises a compression chamber configured to compress the air by a rotating body; and a drive chamber arranged to separate from the compression chamber, provided with a driving mechanism that is placed therein to drive the rotating body, configured such that oil flows through, and placed to communicate with a first end portion of a depressurization pipe. When being viewed in a direction opposed to one side face of a fuel cell, a cooling medium piping and the depressurization pipe including a rising portion that is extended vertically upward are arranged to intersect with each other on the one side face.