Elastic Resin Check Valve Retainer for Fuel Tank Assembly
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Solution Overview
Problem
Existing check valves for fuel tanks have complex structures that complicate assembly, requiring intricate insertion and engagement of metallic and rubber components to function effectively.
Innovation Solution
A check valve design featuring a valve case with a positive pressure valve and a negative pressure valve, both made from elastic resin materials, utilizing a retainer to simplify assembly by allowing the annular sealing member and negative pressure valve to be attached in the same direction, with a spring mechanism to manage pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thin metallic plate is used to fix the valve portion to the valve, then the valve can be assembled with traditional engagement methods, but the assembly process becomes complicated requiring intricate insertion and engagement steps
Solution Approach 1:
The retainer integrates multiple functions into a single component: it fixes the annular sealing member to the valve main body while also supporting the negative pressure valve. This merging eliminates the need for separate fixation structures and simplifies the overall assembly process, directly resolving the contradiction between reliable fixation and assembly simplicity.
Solution Approach 2:
The retainer serves multiple purposes simultaneously: it acts as a fixation structure for the sealing member, a support structure for the negative pressure valve, and a positioning element during assembly. This multi-functionality reduces the number of components needed and simplifies assembly operations while maintaining reliable valve fixation.
2Reliability
If traditional multi-component assembly methods are used, then each component can be optimized independently, but the assembly work becomes time-consuming and inefficient
Solution Approach 1:
By combining the fixation function and support function into the single retainer component, the assembly process is streamlined. The retainer can be installed in one operation while simultaneously securing the sealing member and supporting the negative pressure valve, significantly improving assembly efficiency without compromising component optimization.
Solution Approach 2:
The retainer is designed with pre-formed engagement structures that automatically position and secure components during assembly. The groove structures and support protrusions are预先 configured to guide the sealing member and negative pressure valve into correct positions, reducing assembly time and improving productivity while maintaining component integrity.
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 design enhances workability and simplifies assembly while maintaining effective pressure regulation within the fuel tank by aligning the annular sealing member and negative pressure valve with the valve main body, ensuring efficient operation when pressure rises or falls.
Implementation Method 1
a spring disposed in the valve case configured to urge to make the positive pressure valve abut on the positive pressure valve seat, and to be compressed to thereby open the positive pressure valve when a pressure in the fuel tank rises to a predetermined value or more
Implementation Method 2
an annular sealing member made from an elastic resin material, and mounted on the valve main body so as to abut on and separate from the positive pressure valve seat
Implementation Method 3
a negative pressure valve made from an elastic resin material, and mounted on the retainer so as to abut on and separate from the negative pressure valve seat
Data Source
AI summary
A check valve includes a valve case, a positive pressure valve, a spring, and a negative pressure valve. The positive pressure valve is slidably disposed in a valve chamber of the valve case. The spring urges the positive pressure valve to abut on a positive pressure valve seat of the valve case. The negative pressure valve is on the positive pressure valve to abut on a negative pressure valve seat of the positive pressure valve. The negative pressure valve closes a communicating passage in the positive pressure valve in a normal state, and opens it when a pressure in the fuel tank falls to a predetermined value or less.