Radiator Cap Valve Seat Guidance for Stable Sealing
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Solution Overview
Problem
Existing radiator caps for automobiles suffer from unstable closure, leading to potential leakage and spillover due to unrestrained movement of the valve seat, and they often require metal surface treatment, which can cause environmental pollution.
Innovation Solution
A radiator cap design featuring a top cover unit, intermediate seat unit, output valve unit, and input valve unit, with components made of plastic material, including a valve seat with hook portions and guiding recesses for stable movement, and a spring mechanism for controlled fluid flow, ensuring secure sealing and reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the valve seat is connected only by a spring to the upper cover, then the structure is simple, but the valve seat becomes unrestrainedly movable and may be skewed, resulting in poor sealing
Solution Approach 1:
The valve seat connection structure is segmented into multiple functional components: positioning ribs on the valve seat correspond to positioning grooves on the upper cover, providing lateral positioning; a limiting rib on the valve seat limits downward movement; and a spring provides vertical resilient connection. This segmentation allows each component to perform its specific function, ensuring both simplicity and reliability.
Solution Approach 2:
The positioning ribs and positioning grooves act as intermediary structures between the valve seat and upper cover. These intermediaries provide precise lateral positioning and constraint, preventing the valve seat from skewing while maintaining the simple spring-based vertical connection. The intermediary structures mediate between the need for movement freedom and the need for positional stability.
2Strength
If the upper cover is made of metal material, then the strength is high, but surface treatment is required which causes environmental pollution
Solution Approach 1:
The material parameter of the upper cover is changed from metal to plastic. This parameter change eliminates the need for surface treatment processes, thereby preventing environmental pollution. The plastic material maintains sufficient strength for the application while being inherently suitable for direct molding without additional surface processing steps that would generate harmful emissions.
3Adaptability or versatility
If the valve seat is made movable by spring connection, then the sealing flexibility is improved, but the valve seat may be unrestrainedly movable causing leakage
Solution Approach 1:
The movement constraint system is segmented into multiple independent elements: positioning ribs provide lateral constraint, positioning grooves receive the ribs, and a limiting rib controls downward movement. This segmentation allows the valve seat to move vertically for sealing adaptation while preventing lateral skewing and excessive movement, thus maintaining both flexibility and stability.
Solution Approach 2:
The spring provides an elastic counterforce that balances the pressure forces acting on the valve seat. When pressure differential exists across the radiator cap, the spring's resilient force counteracts the pressure, allowing the valve seat to move to the appropriate position for sealing while preventing unrestrained movement. This counterbalancing mechanism ensures stable closure while maintaining sealing flexibility.
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 new design provides stable sealing and reduces the risk of leakage while minimizing environmental pollution through the use of plastic components, enhancing structural integrity and ease of assembly.
Implementation Method 1
the first spring is caused to generate a spring force. When the liquids are depressurized, the spring force of the first spring restores the valve seat
Implementation Method 2
the second spring generates a spring force. As long as an attraction force applied on the pin rod is smaller than the spring force of the second spring, the spring force of the second spring restores the pin rod
Implementation Method 3
The first spring is disposed within the inner space for resiliently biasing the valve seat away from the top cover unit
Implementation Method 4
The second spring is mounted between the valve seat and a top portion of the pin rod, and is disposed for resiliently biasing a bottom portion of the pin rod to thereby abut against the valve disc
Data Source
AI summary
A radiator cap includes a top cover unit, an intermediate seat unit, an output valve unit, and an input valve unit. The top cover unit includes cover body, a stem, and a plurality of positioning member to be fastened to a radiator opening. A washer surrounds the stem. The intermediate seat unit includes a connecting tube and a connecting seat connected to each other. The output valve unit includes a valve seat connected to the connecting seat. The valve seat has hook portions engaged with guiding recesses of the connecting seat. A valve disc is connected to the valve seat. A first spring is disposed between the valve seat and the connecting seat. The input valve unit includes a pin rod, and a second spring to bias the pin rod to thereby abut against the valve disc so as to close a valve hole.