Fuel Cell Hydrogen Pump Cylinder Heating for Thermal Interference
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Solution Overview
Problem
In fuel cell systems, reducing the clearance between the rotor and the cylinder of hydrogen pumps to improve circulation efficiency can lead to increased temperature differences, causing malfunctions due to interference between the rotor and the cylinder, especially at higher driving states.
Innovation Solution
A fuel cell system with a hydrogen circulation pump, a heating portion, and a controller that heats the cylinder when the driving state exceeds a standard threshold, maintaining the temperature of the cylinder close to the rotor's temperature to prevent interference, using sensors to detect temperature differences and adjust the heating medium flow rate accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the clearance between the rotor and the cylinder is reduced to improve circulation efficiency, then hydrogen circulation efficiency is improved, but the temperature difference between the rotor and the cylinder increases causing interference and malfunction
Solution Approach 1:
The patent changes the temperature parameter of the cylinder by introducing a heating device. The heating device raises the cylinder temperature to match the rotor temperature, thereby eliminating the temperature difference that causes thermal expansion interference. This allows the pump to operate reliably with reduced clearance while maintaining high circulation efficiency
Solution Approach 2:
The heating device performs preliminary heating of the cylinder before the rotor reaches operating temperature or immediately upon startup. This preliminary action prevents the temperature difference from developing in the first place, avoiding thermal expansion interference and potential malfunction before they can occur
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 approach effectively suppresses malfunctions caused by temperature differences between the rotor and the cylinder, ensuring efficient hydrogen circulation and preventing interference, even at higher driving states, by maintaining a consistent temperature across the components.
Implementation Method 1
The heating portion is configured to heat the cylinder
Implementation Method 2
the heating portion may include a heating medium passage and a heating medium supply pump for circulating a heating medium to the heating medium passage
Data Source
AI summary
The fuel cell system includes a fuel cell, a hydrogen circulation pump, heating portion, and a controller. The hydrogen circulation pump is configured to circulate hydrogen to the fuel cell and includes a cylinder and a rotor accommodated in the cylinder. The heating portion is configured to heat the cylinder. The controller is configured to control an operation of the heating portion. The controller is configured to cause the heating portion to heat the cylinder in a case where a driving state of the hydrogen circulation pump is higher than or equal to a standard driving state.