Pressure Cooker Cover Locking Pieces for Float Valve Safety
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Solution Overview
Problem
Existing pressure cooker designs face issues with the float valve being triggered by external forces, leading to unreliable pressure detection and potential safety hazards.
Innovation Solution
A pressure cooker cover with hooks and a push-pull device, featuring a rotating base, rotating shaft, locking piece, and sliding bars, which ensures the cooker cover remains closed under pressure by locking and unlocking based on the float valve's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple float valve structure is used, then the device complexity is reduced and ease of manufacture is improved, but the reliability deteriorates because the float can move under external force regardless of pressure conditions
Solution Approach 1:
A push-pull device is introduced as an intermediary mechanism between the float valve and the cooker cover locking system. This device includes a push rod connected to the float valve and a pulling rod connected to the locking mechanism, transmitting force only when the float moves upward due to pressure. The intermediary ensures that external forces cannot directly move the float, thereby improving reliability while maintaining simple overall structure.
2Ease of operation
If the cooker cover can be easily opened, then the ease of operation is improved, but the safety deteriorates because the cover may open accidentally when pressure is present
Solution Approach 1:
The locking mechanism transitions from a static state to a dynamic state based on pressure conditions. When pressure builds up and moves the float upward, the push-pull device activates the locking mechanism, which dynamically engages to prevent cover opening. When pressure is released and the float returns downward, the locking mechanism dynamically disengages, allowing easy cover opening. This dynamic response ensures safety during pressure cooking while maintaining ease of operation when safe.
3Reliability
If a locking mechanism is added to prevent accidental opening, then the safety is improved, but the device complexity increases
Solution Approach 1:
The locking mechanism is designed to be self-activating through the pressure-driven float valve system. When pressure reaches the threshold, the float automatically pushes the push rod, which in turn activates the locking mechanism without requiring external intervention or complex control systems. The mechanism locks itself based on the pressure condition, providing safety while minimizing added complexity.
Data Source
AI summary
A pressure cooker cover comprises a cover (1) and a float valve (2), wherein a seal ring (7) is installed in the inner edge of the cover while hooks (8) are installed in the two side edges of the cover. A push-pull device (9) which can move the hooks back and forth is mounted in the ends of the hooks. The push-pull device comprises a rotating base (9-1) arranged in the middle portion of the cover, a rotating shaft (9-2) and a locking piece (9-3) which is coupled with the rotating shaft (9-2). Sliding chutes (9-31) are provided at the two sides of the locking piece. Guide columns (8-1) which are slidingly matched with the sliding chutes are set at two ends of the hooks (8).