Fuel Gas Blocking Valve with Inline Plunger for Compact Sealing
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Solution Overview
Problem
Existing fuel gas blocking devices in fuel cell electric vehicles (FCEVs) are bulky, heavy, and costly due to complex perpendicular flow passage and plunger arrangements, which degrade durability and production economics, making them unsuitable for applications in vehicles like drones.
Innovation Solution
A fuel gas blocking device with a solenoid body and flow passage plunger aligned in the same direction, featuring a spring mechanism and gap poppet part to seal and control fuel flow, reducing volume and weight while enhancing durability and production economics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a perpendicular arrangement of flow passage and plunger is used in the fuel gas blocking valve, then the sealing function is achieved, but the volume and weight of the pipe body part increase
Solution Approach 1:
The patent inverts the conventional perpendicular arrangement by aligning the flow passage and plunger movement direction in parallel (same direction). This inversion eliminates the need for complex sealing structures required in perpendicular arrangements, thereby reducing the volume of the pipe body part while maintaining effective sealing through the gap between the plunger and pipe body.
2Reliability
If a perpendicular arrangement of flow passage and plunger is used in the fuel gas blocking valve, then the sealing function is achieved, but the weight of the pipe body part increases
Solution Approach 1:
By inverting the arrangement from perpendicular to parallel alignment of flow passage and plunger movement, the patent reduces the amount of material required for sealing structures and support components, thereby reducing the overall weight of the pipe body part while maintaining reliable sealing through the controlled gap design.
3Reliability
If a partition wall for fuel blocking sealing is separately formed on the flow passage, then leakage prevention is achieved, but the structural complexity and size increase
Solution Approach 1:
The patent extracts and eliminates the separate partition wall structure by integrating the sealing function directly into the plunger-body gap interface. The sealing is achieved through the radial gap between the plunger outer surface and pipe body inner surface, removing the need for additional partition walls and simplifying the overall structure.
4Reliability
If a perpendicular arrangement of flow passage and plunger is used, then the blocking function is achieved, but the durability is degraded due to opening and closing impact
Solution Approach 1:
By inverting the arrangement to parallel alignment, the patent enables the plunger to move along the flow passage direction, allowing the high-pressure fuel gas flow to assist in reducing impact forces during opening and closing operations. This alignment improves durability by reducing mechanical stress on the plunger and sealing surfaces compared to perpendicular arrangements.
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 device achieves reduced size and weight, improved durability, and enhanced sealing performance by aligning flow passages and plunger movements, enabling applications in flight vehicles like drones with better production economics.
Implementation Method 1
a coil part provided on an outer side of a solenoid body
Implementation Method 2
a spring that is provided between the flow passage cover and the flow passage plunger and provides an elastic restoring force in a direction in which the flow passage plunger moves forward
Implementation Method 3
a gap poppet part provided at a front end of the flow passage plunger and selectively sealing the sealing step when moving forward
Data Source
AI summary
To improve durability and production economics, the present disclosure provides a fuel gas blocking device doubling as a flow passage, the device including a supply body part having a flow passage formed therein to supply a fuel gas and provided with a supply port having a sealing step formed therein on one side thereof, a solenoid body of which a front end is hermetically fastened to the supply port and a rear end extends rearward such that a coil part is provided on an outer side thereof, and in which a hollow is formed in a longitudinal direction, and a flow passage cover in which a first flow passage is formed in the longitudinal direction is provided at a rear end of the hollow, a flow passage plunger inserted into a front end of the hollow, selectively moving rearward when power is supplied to the coil part, and having a second flow passage formed therein in the longitudinal direction, a spring that is provided between the flow passage cover and the flow passage plunger and provides an elastic restoring force in a direction in which the flow passage plunger moves forward, and a gap poppet part that is provided at a front end of the flow passage plunger and selectively seals the sealing step when moving forward.