Injection module for a conveyor assembly of a fuel cell system
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Solution Overview
Problem
The existing injection module for fuel cell systems experiences instability in the operation of the second drive nozzle due to jet pump pressure, leading to inconsistent gas flow and inefficient hydrogen recirculation, which affects the overall efficiency of the fuel cell system.
Innovation Solution
The injection module design includes a small nozzle body that abuts a stop disc and a large nozzle body, forming balanced pressure surfaces to prevent jet pump pressure from closing the sequence valve, ensuring stable operation and maintaining the second gas flow path open, even under jet pump pressure, with a spring element for return movement and a progressively variable spring constant for adjustable opening distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dosing valve is opened to enable gas flow through the second drive nozzle, then the hydrogen recirculation capacity is improved, but jet pump pressure builds up and closes the sequence valve again, causing unstable operation
Solution Approach 1:
The patent applies the counterweight principle by designing balanced pressure surfaces (opening pressure surface and closing pressure surface) that are at least almost the same size. The opening pressure surface is subjected to dynamic pressure at the inflow end, while the closing pressure surface is subjected to jet pump pressure at the outflow end. This balanced design ensures that the forces acting on the small nozzle body are equilibriumed, preventing the jet pump pressure from closing the sequence valve and ensuring stable operation of the second drive nozzle.
2Ease of operation
If the small nozzle body is made movable to control the second gas flow path, then the pressure control function is improved, but the jet pump pressure causes unintended closing movement, reducing activation stability
Solution Approach 1:
The patent applies the counterweight principle by designing balanced pressure surfaces (opening pressure surface and closing pressure surface) that are at least almost the same size. The opening pressure surface is subjected to dynamic pressure at the inflow end, while the closing pressure surface is subjected to jet pump pressure at the outflow end. This balanced design ensures that the forces acting on the small nozzle body are equilibriumed, preventing the jet pump pressure from closing the sequence valve and ensuring stable operation of the second drive nozzle.
Solution Approach 2:
The patent employs a spring element with a progressively variable spring constant that provides a return force on the small nozzle body. The spring constant varies progressively along the movement path, allowing the opening distance of the sequence valve to be adjusted according to operating conditions. This enables precise pressure control while maintaining stable activation, as the spring force compensates for pressure variations and ensures reliable return movement.
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 design achieves stable and efficient hydrogen recirculation, ensuring reliable operation across varying fuel cell states and reducing manufacturing and assembly costs by maintaining the second gas flow path open and allowing for precise pressure control.
Implementation Method 1
the opening pressure surface and a closing pressure surface, in particular located at the outflow end of the small nozzle body, are at least almost the same size, wherein the opening pressure surface can be subjected to a dynamic pressure at the inflow end
Implementation Method 2
a spring element for return movement and a progressively variable spring constant for adjustable opening distance
Data Source
AI summary
The invention relates to an injection module (2) for a conveyor assembly (1) of a fuel cell system (31) for conveying and/or recirculating a gaseous medium, in particular hydrogen, in which: the injection module (2) has a communicating opening (29) and/or an inlet opening (3), by means of which the gaseous medium flows into the injection module (2); the injection module (2) has a small nozzle body (13) having a first drive nozzle (12) and a large nozzle body (15) having a second drive nozzle (14), by means of which (12, 14) the gaseous medium flows out of the injection module (2); the small nozzle body (13) is disposed movably in the direction of a longitudinal axis (52) in the large nozzle body (8) and/or in the injection module (2); the small nozzle body (13) and the large nozzle body (15) each have a gas flow path (III, IV); the gaseous medium can flow either only through the first gas flow path III or through the first gas flow path III and the second gas flow path IV simultaneously; the second gas flow path IV can be opened or closed by means of a movement of the small nozzle body (13). According to the invention, the small nozzle body (13) abuts a stop disc (30) and/or at least indirectly abuts the large nozzle body (15), and thus forms an opening pressure surface (22); the opening pressure surface (22) and a closing pressure surface (24), in particular located at the outflow end of the small nozzle body, are at least almost the same size; the opening pressure surface (22) can be subjected to a dynamic pressure (44) at the inflow end.