Fuel Pump Shutoff Valve Structure With External Access Knob
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Solution Overview
Problem
In small commercial vehicles equipped with liquefied petroleum injection (LPI) engines, the shutoff valve for the fuel pump is difficult to access, making it inconvenient and unsafe, and failing to comply with safety regulations.
Innovation Solution
A valve structure with an operation valve and an extension, where the operation valve is disposed within the fuel pump and the extension includes a knob outside the pump housing, connected to the operation valve, allowing easy manipulation of the shutoff valve from outside.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the shutoff valve is installed inside the fuel pump housing, then the fuel pump structure is compact and integrated, but the valve becomes difficult to access for manual operation
Solution Approach 1:
The patent extends the operation knob of the shutoff valve from the interior of the fuel pump housing to the exterior through the pump cover. This dimensional extension allows the valve operation interface to be accessible from outside the fuel pump assembly, resolving the contradiction between integrated structure and operational accessibility.
2Ease of operation
If the pump cover is removed to access the shutoff valve, then the valve can be operated, but the fuel pump is exposed to damage and contamination
Solution Approach 1:
The patent uses the pump cover as an intermediary element that transmits the operational force from the externally accessible knob to the shutoff valve inside the fuel pump housing. This allows valve operation without removing the protective pump cover, maintaining fuel pump integrity while enabling safe access to the valve.
3Ease of manufacture
If the shutoff valve is placed at the upper portion of the LPG tank, then it is close to the fuel pump, but it becomes difficult to access in small commercial vehicles with underbody tank mounting
Solution Approach 1:
The patent extends the valve operation interface along the vertical dimension through the pump cover, allowing the shutoff valve to remain positioned near the fuel pump for manufacturing convenience while providing external accessibility for operation. This dimensional extension resolves the accessibility issue in vehicles with underbody tank mounting.
Data Source
AI summary
A shutoff valve structure of a liquefied petroleum injection (LPI) engine includes an operation valve disposed within a pump housing in a fuel pump and configured to allow or block the flow of fuel from the fuel pump. The shutoff valve structure includes an extension including a knob disposed outside the pump housing and connected to the operation valve by being extended into the pump housing. The operation valve is operable by the knob.