Air extraction structure and keep-fresh container having same
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Solution Overview
Problem
Existing keep-fresh containers fail to maintain a vacuum state due to trapped air, which leads to bacterial growth and reduced storage efficacy.
Innovation Solution
An air extraction structure with an elastic press cover, seat, blocking member, and air exhaust check valve, allowing for convenient and quick air extraction through a simple pressing action, enhancing sealing performance by using PP material for the press cover and silicone for the valve seat and diaphragm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air extraction holes are provided in the container body, then air can be extracted from the container, but air may leak into the container when not in use
Solution Approach 1:
The blocking member is pre-positioned to block the air extraction holes before air extraction begins. The elastic press cover is designed to automatically activate the blocking member's movement when pressed, creating the air extraction pathway only when needed and automatically sealing it when released.
Solution Approach 2:
The blocking member is designed to be movable rather than fixed, allowing it to dynamically switch between blocking and unblocking the air extraction holes. The elastic press cover provides the mechanical force to move the blocking member between its blocked and unblocked positions, enabling the system to adapt its state based on operational needs.
2Object-affected harmful factors
If a blocking member is added to control air extraction holes, then air leakage is prevented, but the structure becomes more complex
Solution Approach 1:
The blocking member integrates multiple functions: it blocks the air extraction holes, seals against the elastic press cover, and moves in response to the press cover's deformation. The sealing rib on the elastic press cover merges the sealing function directly into the press cover structure, eliminating the need for separate sealing components.
Solution Approach 2:
The blocking member utilizes the flexibility of the elastic press cover to its advantage. The sealing rib on the elastic press cover deforms to maintain sealing contact with the blocking member during pressing operations, allowing the blocking member to be simple in structure while still achieving reliable sealing through the elastic deformation of the press cover.
3Productivity
If the elastic press cover is pressed to extract air, then air extraction is achieved, but the pressing operation requires user effort
Solution Approach 1:
The elastic press cover serves itself by using its own elastic deformation to perform multiple functions: it compresses the air extraction chamber to exhaust air, and simultaneously provides the force to move the blocking member from its blocked position to its unblocked position. The elastic restoring force automatically resets the system after pressing, eliminating the need for separate mechanisms.
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 structure maintains a vacuum state within the container, prolonging storage time and ensuring tight sealing, while being suitable for microwave use and easy assembly/disassembly.
Implementation Method 1
the elastic press cover can restore to an initial state under the action of the elastic restoring force of the elastic press cover
Implementation Method 2
the air extraction chamber is in a negative pressure state and can enable the flexible diaphragm to move upwards
Data Source
AI summary
An air extraction structure is disclosed, including: an elastic press cover; a seat, which forms an air extraction chamber with the elastic press cover and which is provided with a mounting hole, a plurality of air extraction holes being arranged in the circumferential direction of the mounting hole; a valve seat provided with a receiving hole communicating with the mounting hole and the air extraction hole; a blocking member including a flexible diaphragm and a clamping part, the clamping part is clamped and placed on a lower surface of the seat, a lower surface of the flexible diaphragm can be attached to an upper surface of the valve seat and sealing the air extraction hole, a first reinforcing rib extends circumferentially on the lower surface of the flexible diaphragm; and an air exhaust check valve mounted on the seat. A keep-fresh container is further disclosed.